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/skbuff.h> |
| 18 | #include <linux/vmalloc.h> |
| 19 | #include <linux/stddef.h> |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/percpu.h> |
| 22 | #include <linux/moduleparam.h> |
| 23 | #include <linux/notifier.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/netdevice.h> |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 26 | #include <linux/rtnetlink.h> |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 27 | |
| 28 | #include <net/netfilter/nf_conntrack.h> |
| 29 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 30 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 31 | #include <net/netfilter/nf_conntrack_core.h> |
| 32 | |
Adrian Bunk | 42bad1d | 2007-04-26 00:57:41 -0700 | [diff] [blame] | 33 | static struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX] __read_mostly; |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 34 | struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX] __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 35 | EXPORT_SYMBOL_GPL(nf_ct_l3protos); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 36 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 37 | static DEFINE_MUTEX(nf_ct_proto_mutex); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 38 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 39 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 40 | static int |
Pavel Emelyanov | b3fd3ff | 2008-01-09 00:34:02 -0800 | [diff] [blame] | 41 | 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] | 42 | struct ctl_table *table, unsigned int *users) |
| 43 | { |
| 44 | if (*header == NULL) { |
Pavel Emelyanov | b3fd3ff | 2008-01-09 00:34:02 -0800 | [diff] [blame] | 45 | *header = register_sysctl_paths(path, table); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 46 | if (*header == NULL) |
| 47 | return -ENOMEM; |
| 48 | } |
| 49 | if (users != NULL) |
| 50 | (*users)++; |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static void |
| 55 | nf_ct_unregister_sysctl(struct ctl_table_header **header, |
| 56 | struct ctl_table *table, unsigned int *users) |
| 57 | { |
| 58 | if (users != NULL && --*users > 0) |
| 59 | return; |
Pavel Emelyanov | b3fd3ff | 2008-01-09 00:34:02 -0800 | [diff] [blame] | 60 | |
| 61 | unregister_sysctl_table(*header); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 62 | *header = NULL; |
| 63 | } |
| 64 | #endif |
| 65 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 66 | struct nf_conntrack_l4proto * |
| 67 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 68 | { |
| 69 | if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 70 | return &nf_conntrack_l4proto_generic; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 71 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 72 | return rcu_dereference(nf_ct_protos[l3proto][l4proto]); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 73 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 74 | EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 75 | |
| 76 | /* this is guaranteed to always return a valid protocol helper, since |
| 77 | * it falls back to generic_protocol */ |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 78 | struct nf_conntrack_l3proto * |
| 79 | nf_ct_l3proto_find_get(u_int16_t l3proto) |
| 80 | { |
| 81 | struct nf_conntrack_l3proto *p; |
| 82 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 83 | rcu_read_lock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 84 | p = __nf_ct_l3proto_find(l3proto); |
| 85 | if (!try_module_get(p->me)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 86 | p = &nf_conntrack_l3proto_generic; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 87 | rcu_read_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 88 | |
| 89 | return p; |
| 90 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 91 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 92 | |
| 93 | void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p) |
| 94 | { |
| 95 | module_put(p->me); |
| 96 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 97 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 98 | |
| 99 | int |
| 100 | nf_ct_l3proto_try_module_get(unsigned short l3proto) |
| 101 | { |
| 102 | int ret; |
| 103 | struct nf_conntrack_l3proto *p; |
| 104 | |
| 105 | retry: p = nf_ct_l3proto_find_get(l3proto); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 106 | if (p == &nf_conntrack_l3proto_generic) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 107 | ret = request_module("nf_conntrack-%d", l3proto); |
| 108 | if (!ret) |
| 109 | goto retry; |
| 110 | |
| 111 | return -EPROTOTYPE; |
| 112 | } |
| 113 | |
| 114 | return 0; |
| 115 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 116 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 117 | |
| 118 | void nf_ct_l3proto_module_put(unsigned short l3proto) |
| 119 | { |
| 120 | struct nf_conntrack_l3proto *p; |
| 121 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 122 | /* rcu_read_lock not necessary since the caller holds a reference */ |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 123 | p = __nf_ct_l3proto_find(l3proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 124 | module_put(p->me); |
| 125 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 126 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 127 | |
| 128 | static int kill_l3proto(struct nf_conn *i, void *data) |
| 129 | { |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 130 | return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 131 | } |
| 132 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 133 | static int kill_l4proto(struct nf_conn *i, void *data) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 134 | { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 135 | struct nf_conntrack_l4proto *l4proto; |
| 136 | l4proto = (struct nf_conntrack_l4proto *)data; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 137 | return nf_ct_protonum(i) == l4proto->l4proto && |
| 138 | nf_ct_l3num(i) == l4proto->l3proto; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 139 | } |
| 140 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 141 | static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 142 | { |
| 143 | int err = 0; |
| 144 | |
| 145 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 146 | if (l3proto->ctl_table != NULL) { |
| 147 | err = nf_ct_register_sysctl(&l3proto->ctl_table_header, |
| 148 | l3proto->ctl_table_path, |
| 149 | l3proto->ctl_table, NULL); |
| 150 | } |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 151 | #endif |
| 152 | return err; |
| 153 | } |
| 154 | |
| 155 | static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 156 | { |
| 157 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 158 | if (l3proto->ctl_table_header != NULL) |
| 159 | nf_ct_unregister_sysctl(&l3proto->ctl_table_header, |
| 160 | l3proto->ctl_table, NULL); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 161 | #endif |
| 162 | } |
| 163 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 164 | int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) |
| 165 | { |
| 166 | int ret = 0; |
| 167 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 168 | if (proto->l3proto >= AF_MAX) |
| 169 | return -EBUSY; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 170 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 171 | if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size) |
| 172 | return -EINVAL; |
| 173 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 174 | mutex_lock(&nf_ct_proto_mutex); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 175 | if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) { |
| 176 | ret = -EBUSY; |
| 177 | goto out_unlock; |
| 178 | } |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 179 | |
| 180 | ret = nf_ct_l3proto_register_sysctl(proto); |
| 181 | if (ret < 0) |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 182 | goto out_unlock; |
| 183 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 184 | if (proto->nlattr_tuple_size) |
| 185 | proto->nla_size = 3 * proto->nlattr_tuple_size(); |
| 186 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 187 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 188 | |
| 189 | out_unlock: |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 190 | mutex_unlock(&nf_ct_proto_mutex); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 191 | return ret; |
| 192 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 193 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 194 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 195 | void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 196 | { |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 197 | struct net *net; |
| 198 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 199 | BUG_ON(proto->l3proto >= AF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 200 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 201 | mutex_lock(&nf_ct_proto_mutex); |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 202 | BUG_ON(nf_ct_l3protos[proto->l3proto] != proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 203 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
| 204 | &nf_conntrack_l3proto_generic); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 205 | nf_ct_l3proto_unregister_sysctl(proto); |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 206 | mutex_unlock(&nf_ct_proto_mutex); |
| 207 | |
| 208 | synchronize_rcu(); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 209 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 210 | /* Remove all contrack entries for this protocol */ |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 211 | rtnl_lock(); |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 212 | for_each_net(net) |
| 213 | nf_ct_iterate_cleanup(net, kill_l3proto, proto); |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 214 | rtnl_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 215 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 216 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 217 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 218 | static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 219 | { |
| 220 | int err = 0; |
| 221 | |
| 222 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 223 | if (l4proto->ctl_table != NULL) { |
| 224 | err = nf_ct_register_sysctl(l4proto->ctl_table_header, |
| 225 | nf_net_netfilter_sysctl_path, |
| 226 | l4proto->ctl_table, |
| 227 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 228 | if (err < 0) |
| 229 | goto out; |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 230 | } |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 231 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 232 | if (l4proto->ctl_compat_table != NULL) { |
| 233 | err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header, |
| 234 | nf_net_ipv4_netfilter_sysctl_path, |
| 235 | l4proto->ctl_compat_table, NULL); |
| 236 | if (err == 0) |
| 237 | goto out; |
| 238 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 239 | l4proto->ctl_table, |
| 240 | l4proto->ctl_table_users); |
| 241 | } |
| 242 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
| 243 | out: |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 244 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 245 | return err; |
| 246 | } |
| 247 | |
| 248 | static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 249 | { |
| 250 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 251 | if (l4proto->ctl_table_header != NULL && |
| 252 | *l4proto->ctl_table_header != NULL) |
| 253 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 254 | l4proto->ctl_table, |
| 255 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 256 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 257 | if (l4proto->ctl_compat_table_header != NULL) |
| 258 | nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header, |
| 259 | l4proto->ctl_compat_table, NULL); |
| 260 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 261 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 262 | } |
| 263 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 264 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
| 265 | them. --RR */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 266 | int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 267 | { |
| 268 | int ret = 0; |
| 269 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 270 | if (l4proto->l3proto >= PF_MAX) |
| 271 | return -EBUSY; |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 272 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 273 | if ((l4proto->to_nlattr && !l4proto->nlattr_size) |
| 274 | || (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size)) |
| 275 | return -EINVAL; |
| 276 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 277 | mutex_lock(&nf_ct_proto_mutex); |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 278 | if (!nf_ct_protos[l4proto->l3proto]) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 279 | /* l3proto may be loaded latter. */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 280 | struct nf_conntrack_l4proto **proto_array; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 281 | int i; |
| 282 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 283 | proto_array = kmalloc(MAX_NF_CT_PROTO * |
| 284 | sizeof(struct nf_conntrack_l4proto *), |
| 285 | GFP_KERNEL); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 286 | if (proto_array == NULL) { |
| 287 | ret = -ENOMEM; |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 288 | goto out_unlock; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 289 | } |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 290 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 291 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 292 | proto_array[i] = &nf_conntrack_l4proto_generic; |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 293 | nf_ct_protos[l4proto->l3proto] = proto_array; |
| 294 | } else if (nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != |
| 295 | &nf_conntrack_l4proto_generic) { |
| 296 | ret = -EBUSY; |
| 297 | goto out_unlock; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 298 | } |
| 299 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 300 | ret = nf_ct_l4proto_register_sysctl(l4proto); |
| 301 | if (ret < 0) |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 302 | goto out_unlock; |
| 303 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 304 | l4proto->nla_size = 0; |
| 305 | if (l4proto->nlattr_size) |
| 306 | l4proto->nla_size += l4proto->nlattr_size(); |
| 307 | if (l4proto->nlattr_tuple_size) |
| 308 | l4proto->nla_size += 3 * l4proto->nlattr_tuple_size(); |
| 309 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 310 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 311 | l4proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 312 | |
| 313 | out_unlock: |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 314 | mutex_unlock(&nf_ct_proto_mutex); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 315 | return ret; |
| 316 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 317 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register); |
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 | void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 320 | { |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 321 | struct net *net; |
| 322 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 323 | BUG_ON(l4proto->l3proto >= PF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 324 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 325 | mutex_lock(&nf_ct_proto_mutex); |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 326 | BUG_ON(nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != l4proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 327 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 328 | &nf_conntrack_l4proto_generic); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 329 | nf_ct_l4proto_unregister_sysctl(l4proto); |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 330 | mutex_unlock(&nf_ct_proto_mutex); |
| 331 | |
| 332 | synchronize_rcu(); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 333 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 334 | /* Remove all contrack entries for this protocol */ |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 335 | rtnl_lock(); |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 336 | for_each_net(net) |
| 337 | nf_ct_iterate_cleanup(net, kill_l4proto, l4proto); |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 338 | rtnl_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 339 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 340 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister); |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 341 | |
| 342 | int nf_conntrack_proto_init(void) |
| 343 | { |
| 344 | unsigned int i; |
| 345 | int err; |
| 346 | |
| 347 | err = nf_ct_l4proto_register_sysctl(&nf_conntrack_l4proto_generic); |
| 348 | if (err < 0) |
| 349 | return err; |
| 350 | |
| 351 | for (i = 0; i < AF_MAX; i++) |
| 352 | rcu_assign_pointer(nf_ct_l3protos[i], |
| 353 | &nf_conntrack_l3proto_generic); |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | void nf_conntrack_proto_fini(void) |
| 358 | { |
| 359 | unsigned int i; |
| 360 | |
| 361 | nf_ct_l4proto_unregister_sysctl(&nf_conntrack_l4proto_generic); |
| 362 | |
| 363 | /* free l3proto protocol tables */ |
| 364 | for (i = 0; i < PF_MAX; i++) |
| 365 | kfree(nf_ct_protos[i]); |
| 366 | } |