18f03dea5SMartin Josefsson /* L3/L4 protocol support for nf_conntrack. */ 28f03dea5SMartin Josefsson 38f03dea5SMartin Josefsson /* (C) 1999-2001 Paul `Rusty' Russell 48f03dea5SMartin Josefsson * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> 58f03dea5SMartin Josefsson * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> 68f03dea5SMartin Josefsson * 78f03dea5SMartin Josefsson * This program is free software; you can redistribute it and/or modify 88f03dea5SMartin Josefsson * it under the terms of the GNU General Public License version 2 as 98f03dea5SMartin Josefsson * published by the Free Software Foundation. 108f03dea5SMartin Josefsson */ 118f03dea5SMartin Josefsson 128f03dea5SMartin Josefsson #include <linux/types.h> 138f03dea5SMartin Josefsson #include <linux/netfilter.h> 148f03dea5SMartin Josefsson #include <linux/module.h> 15d62f9ed4SPatrick McHardy #include <linux/mutex.h> 168f03dea5SMartin Josefsson #include <linux/skbuff.h> 178f03dea5SMartin Josefsson #include <linux/vmalloc.h> 188f03dea5SMartin Josefsson #include <linux/stddef.h> 198f03dea5SMartin Josefsson #include <linux/err.h> 208f03dea5SMartin Josefsson #include <linux/percpu.h> 218f03dea5SMartin Josefsson #include <linux/moduleparam.h> 228f03dea5SMartin Josefsson #include <linux/notifier.h> 238f03dea5SMartin Josefsson #include <linux/kernel.h> 248f03dea5SMartin Josefsson #include <linux/netdevice.h> 258f03dea5SMartin Josefsson 268f03dea5SMartin Josefsson #include <net/netfilter/nf_conntrack.h> 278f03dea5SMartin Josefsson #include <net/netfilter/nf_conntrack_l3proto.h> 28605dcad6SMartin Josefsson #include <net/netfilter/nf_conntrack_l4proto.h> 298f03dea5SMartin Josefsson #include <net/netfilter/nf_conntrack_core.h> 308f03dea5SMartin Josefsson 3142bad1daSAdrian Bunk static struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX] __read_mostly; 32ae5718fbSMartin Josefsson struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX] __read_mostly; 3313b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_ct_l3protos); 348f03dea5SMartin Josefsson 35b19caa0cSPatrick McHardy static DEFINE_MUTEX(nf_ct_proto_mutex); 36d62f9ed4SPatrick McHardy 37b19caa0cSPatrick McHardy #ifdef CONFIG_SYSCTL 38d62f9ed4SPatrick McHardy static int 39b3fd3ffeSPavel Emelyanov nf_ct_register_sysctl(struct ctl_table_header **header, struct ctl_path *path, 40d62f9ed4SPatrick McHardy struct ctl_table *table, unsigned int *users) 41d62f9ed4SPatrick McHardy { 42d62f9ed4SPatrick McHardy if (*header == NULL) { 43b3fd3ffeSPavel Emelyanov *header = register_sysctl_paths(path, table); 44d62f9ed4SPatrick McHardy if (*header == NULL) 45d62f9ed4SPatrick McHardy return -ENOMEM; 46d62f9ed4SPatrick McHardy } 47d62f9ed4SPatrick McHardy if (users != NULL) 48d62f9ed4SPatrick McHardy (*users)++; 49d62f9ed4SPatrick McHardy return 0; 50d62f9ed4SPatrick McHardy } 51d62f9ed4SPatrick McHardy 52d62f9ed4SPatrick McHardy static void 53d62f9ed4SPatrick McHardy nf_ct_unregister_sysctl(struct ctl_table_header **header, 54d62f9ed4SPatrick McHardy struct ctl_table *table, unsigned int *users) 55d62f9ed4SPatrick McHardy { 56d62f9ed4SPatrick McHardy if (users != NULL && --*users > 0) 57d62f9ed4SPatrick McHardy return; 58b3fd3ffeSPavel Emelyanov 59b3fd3ffeSPavel Emelyanov unregister_sysctl_table(*header); 60d62f9ed4SPatrick McHardy *header = NULL; 61d62f9ed4SPatrick McHardy } 62d62f9ed4SPatrick McHardy #endif 63d62f9ed4SPatrick McHardy 64605dcad6SMartin Josefsson struct nf_conntrack_l4proto * 65605dcad6SMartin Josefsson __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto) 668f03dea5SMartin Josefsson { 678f03dea5SMartin Josefsson if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL)) 68605dcad6SMartin Josefsson return &nf_conntrack_l4proto_generic; 698f03dea5SMartin Josefsson 70923f4902SPatrick McHardy return rcu_dereference(nf_ct_protos[l3proto][l4proto]); 718f03dea5SMartin Josefsson } 7213b18339SPatrick McHardy EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find); 738f03dea5SMartin Josefsson 748f03dea5SMartin Josefsson /* this is guaranteed to always return a valid protocol helper, since 758f03dea5SMartin Josefsson * it falls back to generic_protocol */ 76605dcad6SMartin Josefsson struct nf_conntrack_l4proto * 77605dcad6SMartin Josefsson nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t l4proto) 788f03dea5SMartin Josefsson { 79605dcad6SMartin Josefsson struct nf_conntrack_l4proto *p; 808f03dea5SMartin Josefsson 81923f4902SPatrick McHardy rcu_read_lock(); 82605dcad6SMartin Josefsson p = __nf_ct_l4proto_find(l3proto, l4proto); 838f03dea5SMartin Josefsson if (!try_module_get(p->me)) 84605dcad6SMartin Josefsson p = &nf_conntrack_l4proto_generic; 85923f4902SPatrick McHardy rcu_read_unlock(); 868f03dea5SMartin Josefsson 878f03dea5SMartin Josefsson return p; 888f03dea5SMartin Josefsson } 8913b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get); 908f03dea5SMartin Josefsson 91605dcad6SMartin Josefsson void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p) 928f03dea5SMartin Josefsson { 938f03dea5SMartin Josefsson module_put(p->me); 948f03dea5SMartin Josefsson } 9513b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_ct_l4proto_put); 968f03dea5SMartin Josefsson 978f03dea5SMartin Josefsson struct nf_conntrack_l3proto * 988f03dea5SMartin Josefsson nf_ct_l3proto_find_get(u_int16_t l3proto) 998f03dea5SMartin Josefsson { 1008f03dea5SMartin Josefsson struct nf_conntrack_l3proto *p; 1018f03dea5SMartin Josefsson 102923f4902SPatrick McHardy rcu_read_lock(); 1038f03dea5SMartin Josefsson p = __nf_ct_l3proto_find(l3proto); 1048f03dea5SMartin Josefsson if (!try_module_get(p->me)) 105605dcad6SMartin Josefsson p = &nf_conntrack_l3proto_generic; 106923f4902SPatrick McHardy rcu_read_unlock(); 1078f03dea5SMartin Josefsson 1088f03dea5SMartin Josefsson return p; 1098f03dea5SMartin Josefsson } 11013b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get); 1118f03dea5SMartin Josefsson 1128f03dea5SMartin Josefsson void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p) 1138f03dea5SMartin Josefsson { 1148f03dea5SMartin Josefsson module_put(p->me); 1158f03dea5SMartin Josefsson } 11613b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_ct_l3proto_put); 1178f03dea5SMartin Josefsson 1188f03dea5SMartin Josefsson int 1198f03dea5SMartin Josefsson nf_ct_l3proto_try_module_get(unsigned short l3proto) 1208f03dea5SMartin Josefsson { 1218f03dea5SMartin Josefsson int ret; 1228f03dea5SMartin Josefsson struct nf_conntrack_l3proto *p; 1238f03dea5SMartin Josefsson 1248f03dea5SMartin Josefsson retry: p = nf_ct_l3proto_find_get(l3proto); 125605dcad6SMartin Josefsson if (p == &nf_conntrack_l3proto_generic) { 1268f03dea5SMartin Josefsson ret = request_module("nf_conntrack-%d", l3proto); 1278f03dea5SMartin Josefsson if (!ret) 1288f03dea5SMartin Josefsson goto retry; 1298f03dea5SMartin Josefsson 1308f03dea5SMartin Josefsson return -EPROTOTYPE; 1318f03dea5SMartin Josefsson } 1328f03dea5SMartin Josefsson 1338f03dea5SMartin Josefsson return 0; 1348f03dea5SMartin Josefsson } 13513b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get); 1368f03dea5SMartin Josefsson 1378f03dea5SMartin Josefsson void nf_ct_l3proto_module_put(unsigned short l3proto) 1388f03dea5SMartin Josefsson { 1398f03dea5SMartin Josefsson struct nf_conntrack_l3proto *p; 1408f03dea5SMartin Josefsson 141923f4902SPatrick McHardy /* rcu_read_lock not necessary since the caller holds a reference */ 1428f03dea5SMartin Josefsson p = __nf_ct_l3proto_find(l3proto); 1438f03dea5SMartin Josefsson module_put(p->me); 1448f03dea5SMartin Josefsson } 14513b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put); 1468f03dea5SMartin Josefsson 1478f03dea5SMartin Josefsson static int kill_l3proto(struct nf_conn *i, void *data) 1488f03dea5SMartin Josefsson { 1495e8fbe2aSPatrick McHardy return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto; 1508f03dea5SMartin Josefsson } 1518f03dea5SMartin Josefsson 152605dcad6SMartin Josefsson static int kill_l4proto(struct nf_conn *i, void *data) 1538f03dea5SMartin Josefsson { 154605dcad6SMartin Josefsson struct nf_conntrack_l4proto *l4proto; 155605dcad6SMartin Josefsson l4proto = (struct nf_conntrack_l4proto *)data; 1565e8fbe2aSPatrick McHardy return nf_ct_protonum(i) == l4proto->l4proto && 1575e8fbe2aSPatrick McHardy nf_ct_l3num(i) == l4proto->l3proto; 1588f03dea5SMartin Josefsson } 1598f03dea5SMartin Josefsson 160d62f9ed4SPatrick McHardy static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto) 161d62f9ed4SPatrick McHardy { 162d62f9ed4SPatrick McHardy int err = 0; 163d62f9ed4SPatrick McHardy 164d62f9ed4SPatrick McHardy #ifdef CONFIG_SYSCTL 165d62f9ed4SPatrick McHardy if (l3proto->ctl_table != NULL) { 166d62f9ed4SPatrick McHardy err = nf_ct_register_sysctl(&l3proto->ctl_table_header, 167d62f9ed4SPatrick McHardy l3proto->ctl_table_path, 168d62f9ed4SPatrick McHardy l3proto->ctl_table, NULL); 169d62f9ed4SPatrick McHardy } 170d62f9ed4SPatrick McHardy #endif 171d62f9ed4SPatrick McHardy return err; 172d62f9ed4SPatrick McHardy } 173d62f9ed4SPatrick McHardy 174d62f9ed4SPatrick McHardy static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto) 175d62f9ed4SPatrick McHardy { 176d62f9ed4SPatrick McHardy #ifdef CONFIG_SYSCTL 177d62f9ed4SPatrick McHardy if (l3proto->ctl_table_header != NULL) 178d62f9ed4SPatrick McHardy nf_ct_unregister_sysctl(&l3proto->ctl_table_header, 179d62f9ed4SPatrick McHardy l3proto->ctl_table, NULL); 180d62f9ed4SPatrick McHardy #endif 181d62f9ed4SPatrick McHardy } 182d62f9ed4SPatrick McHardy 1838f03dea5SMartin Josefsson int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) 1848f03dea5SMartin Josefsson { 1858f03dea5SMartin Josefsson int ret = 0; 1868f03dea5SMartin Josefsson 1870661cca9SPatrick McHardy if (proto->l3proto >= AF_MAX) 1880661cca9SPatrick McHardy return -EBUSY; 1898f03dea5SMartin Josefsson 190b19caa0cSPatrick McHardy mutex_lock(&nf_ct_proto_mutex); 191ae5718fbSMartin Josefsson if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) { 192ae5718fbSMartin Josefsson ret = -EBUSY; 193ae5718fbSMartin Josefsson goto out_unlock; 194ae5718fbSMartin Josefsson } 195d62f9ed4SPatrick McHardy 196d62f9ed4SPatrick McHardy ret = nf_ct_l3proto_register_sysctl(proto); 197d62f9ed4SPatrick McHardy if (ret < 0) 1980661cca9SPatrick McHardy goto out_unlock; 1990661cca9SPatrick McHardy 2000661cca9SPatrick McHardy rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); 201ae5718fbSMartin Josefsson 202ae5718fbSMartin Josefsson out_unlock: 203b19caa0cSPatrick McHardy mutex_unlock(&nf_ct_proto_mutex); 2048f03dea5SMartin Josefsson return ret; 2058f03dea5SMartin Josefsson } 20613b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register); 2078f03dea5SMartin Josefsson 208fe3eb20cSPatrick McHardy void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto) 2098f03dea5SMartin Josefsson { 210678d6675SAlexey Dobriyan struct net *net; 211678d6675SAlexey Dobriyan 212fe3eb20cSPatrick McHardy BUG_ON(proto->l3proto >= AF_MAX); 213ae5718fbSMartin Josefsson 214b19caa0cSPatrick McHardy mutex_lock(&nf_ct_proto_mutex); 215fe3eb20cSPatrick McHardy BUG_ON(nf_ct_l3protos[proto->l3proto] != proto); 216923f4902SPatrick McHardy rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], 217923f4902SPatrick McHardy &nf_conntrack_l3proto_generic); 218d62f9ed4SPatrick McHardy nf_ct_l3proto_unregister_sysctl(proto); 2190661cca9SPatrick McHardy mutex_unlock(&nf_ct_proto_mutex); 2200661cca9SPatrick McHardy 2210661cca9SPatrick McHardy synchronize_rcu(); 222d62f9ed4SPatrick McHardy 2238f03dea5SMartin Josefsson /* Remove all contrack entries for this protocol */ 224678d6675SAlexey Dobriyan for_each_net(net) 225678d6675SAlexey Dobriyan nf_ct_iterate_cleanup(net, kill_l3proto, proto); 2268f03dea5SMartin Josefsson } 22713b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister); 2288f03dea5SMartin Josefsson 229d62f9ed4SPatrick McHardy static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) 230d62f9ed4SPatrick McHardy { 231d62f9ed4SPatrick McHardy int err = 0; 232d62f9ed4SPatrick McHardy 233d62f9ed4SPatrick McHardy #ifdef CONFIG_SYSCTL 234d62f9ed4SPatrick McHardy if (l4proto->ctl_table != NULL) { 235d62f9ed4SPatrick McHardy err = nf_ct_register_sysctl(l4proto->ctl_table_header, 236d62f9ed4SPatrick McHardy nf_net_netfilter_sysctl_path, 237d62f9ed4SPatrick McHardy l4proto->ctl_table, 238d62f9ed4SPatrick McHardy l4proto->ctl_table_users); 239a999e683SPatrick McHardy if (err < 0) 240a999e683SPatrick McHardy goto out; 241d62f9ed4SPatrick McHardy } 242a999e683SPatrick McHardy #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT 243a999e683SPatrick McHardy if (l4proto->ctl_compat_table != NULL) { 244a999e683SPatrick McHardy err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header, 245a999e683SPatrick McHardy nf_net_ipv4_netfilter_sysctl_path, 246a999e683SPatrick McHardy l4proto->ctl_compat_table, NULL); 247a999e683SPatrick McHardy if (err == 0) 248a999e683SPatrick McHardy goto out; 249a999e683SPatrick McHardy nf_ct_unregister_sysctl(l4proto->ctl_table_header, 250a999e683SPatrick McHardy l4proto->ctl_table, 251a999e683SPatrick McHardy l4proto->ctl_table_users); 252a999e683SPatrick McHardy } 253a999e683SPatrick McHardy #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ 254a999e683SPatrick McHardy out: 255933a41e7SPatrick McHardy #endif /* CONFIG_SYSCTL */ 256d62f9ed4SPatrick McHardy return err; 257d62f9ed4SPatrick McHardy } 258d62f9ed4SPatrick McHardy 259d62f9ed4SPatrick McHardy static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto) 260d62f9ed4SPatrick McHardy { 261d62f9ed4SPatrick McHardy #ifdef CONFIG_SYSCTL 262d62f9ed4SPatrick McHardy if (l4proto->ctl_table_header != NULL && 263d62f9ed4SPatrick McHardy *l4proto->ctl_table_header != NULL) 264d62f9ed4SPatrick McHardy nf_ct_unregister_sysctl(l4proto->ctl_table_header, 265d62f9ed4SPatrick McHardy l4proto->ctl_table, 266d62f9ed4SPatrick McHardy l4proto->ctl_table_users); 267a999e683SPatrick McHardy #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT 268a999e683SPatrick McHardy if (l4proto->ctl_compat_table_header != NULL) 269a999e683SPatrick McHardy nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header, 270a999e683SPatrick McHardy l4proto->ctl_compat_table, NULL); 271a999e683SPatrick McHardy #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ 272933a41e7SPatrick McHardy #endif /* CONFIG_SYSCTL */ 273d62f9ed4SPatrick McHardy } 274d62f9ed4SPatrick McHardy 2758f03dea5SMartin Josefsson /* FIXME: Allow NULL functions and sub in pointers to generic for 2768f03dea5SMartin Josefsson them. --RR */ 277605dcad6SMartin Josefsson int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) 2788f03dea5SMartin Josefsson { 2798f03dea5SMartin Josefsson int ret = 0; 2808f03dea5SMartin Josefsson 2810661cca9SPatrick McHardy if (l4proto->l3proto >= PF_MAX) 2820661cca9SPatrick McHardy return -EBUSY; 283ae5718fbSMartin Josefsson 284b19caa0cSPatrick McHardy mutex_lock(&nf_ct_proto_mutex); 285c6a1e615SPatrick McHardy if (!nf_ct_protos[l4proto->l3proto]) { 2868f03dea5SMartin Josefsson /* l3proto may be loaded latter. */ 287605dcad6SMartin Josefsson struct nf_conntrack_l4proto **proto_array; 2888f03dea5SMartin Josefsson int i; 2898f03dea5SMartin Josefsson 290c6a1e615SPatrick McHardy proto_array = kmalloc(MAX_NF_CT_PROTO * 291605dcad6SMartin Josefsson sizeof(struct nf_conntrack_l4proto *), 2928f03dea5SMartin Josefsson GFP_KERNEL); 2938f03dea5SMartin Josefsson if (proto_array == NULL) { 2948f03dea5SMartin Josefsson ret = -ENOMEM; 295b19caa0cSPatrick McHardy goto out_unlock; 2968f03dea5SMartin Josefsson } 297c6a1e615SPatrick McHardy 2988f03dea5SMartin Josefsson for (i = 0; i < MAX_NF_CT_PROTO; i++) 299605dcad6SMartin Josefsson proto_array[i] = &nf_conntrack_l4proto_generic; 300605dcad6SMartin Josefsson nf_ct_protos[l4proto->l3proto] = proto_array; 301c6a1e615SPatrick McHardy } else if (nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != 302c6a1e615SPatrick McHardy &nf_conntrack_l4proto_generic) { 303c6a1e615SPatrick McHardy ret = -EBUSY; 304c6a1e615SPatrick McHardy goto out_unlock; 3058f03dea5SMartin Josefsson } 3068f03dea5SMartin Josefsson 307d62f9ed4SPatrick McHardy ret = nf_ct_l4proto_register_sysctl(l4proto); 308d62f9ed4SPatrick McHardy if (ret < 0) 3090661cca9SPatrick McHardy goto out_unlock; 3100661cca9SPatrick McHardy 311c6a1e615SPatrick McHardy rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], 312c6a1e615SPatrick McHardy l4proto); 3138f03dea5SMartin Josefsson 3148f03dea5SMartin Josefsson out_unlock: 315b19caa0cSPatrick McHardy mutex_unlock(&nf_ct_proto_mutex); 3168f03dea5SMartin Josefsson return ret; 3178f03dea5SMartin Josefsson } 31813b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register); 3198f03dea5SMartin Josefsson 320fe3eb20cSPatrick McHardy void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) 3218f03dea5SMartin Josefsson { 322678d6675SAlexey Dobriyan struct net *net; 323678d6675SAlexey Dobriyan 324fe3eb20cSPatrick McHardy BUG_ON(l4proto->l3proto >= PF_MAX); 325ae5718fbSMartin Josefsson 326b19caa0cSPatrick McHardy mutex_lock(&nf_ct_proto_mutex); 327fe3eb20cSPatrick McHardy BUG_ON(nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != l4proto); 328923f4902SPatrick McHardy rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], 329923f4902SPatrick McHardy &nf_conntrack_l4proto_generic); 330d62f9ed4SPatrick McHardy nf_ct_l4proto_unregister_sysctl(l4proto); 3310661cca9SPatrick McHardy mutex_unlock(&nf_ct_proto_mutex); 3320661cca9SPatrick McHardy 3330661cca9SPatrick McHardy synchronize_rcu(); 334d62f9ed4SPatrick McHardy 3358f03dea5SMartin Josefsson /* Remove all contrack entries for this protocol */ 336678d6675SAlexey Dobriyan for_each_net(net) 337678d6675SAlexey Dobriyan nf_ct_iterate_cleanup(net, kill_l4proto, l4proto); 3388f03dea5SMartin Josefsson } 33913b18339SPatrick McHardy EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister); 340ac5357ebSPatrick McHardy 341ac5357ebSPatrick McHardy int nf_conntrack_proto_init(void) 342ac5357ebSPatrick McHardy { 343ac5357ebSPatrick McHardy unsigned int i; 344ac5357ebSPatrick McHardy int err; 345ac5357ebSPatrick McHardy 346ac5357ebSPatrick McHardy err = nf_ct_l4proto_register_sysctl(&nf_conntrack_l4proto_generic); 347ac5357ebSPatrick McHardy if (err < 0) 348ac5357ebSPatrick McHardy return err; 349ac5357ebSPatrick McHardy 350ac5357ebSPatrick McHardy for (i = 0; i < AF_MAX; i++) 351ac5357ebSPatrick McHardy rcu_assign_pointer(nf_ct_l3protos[i], 352ac5357ebSPatrick McHardy &nf_conntrack_l3proto_generic); 353ac5357ebSPatrick McHardy return 0; 354ac5357ebSPatrick McHardy } 355ac5357ebSPatrick McHardy 356ac5357ebSPatrick McHardy void nf_conntrack_proto_fini(void) 357ac5357ebSPatrick McHardy { 358ac5357ebSPatrick McHardy unsigned int i; 359ac5357ebSPatrick McHardy 360ac5357ebSPatrick McHardy nf_ct_l4proto_unregister_sysctl(&nf_conntrack_l4proto_generic); 361ac5357ebSPatrick McHardy 362ac5357ebSPatrick McHardy /* free l3proto protocol tables */ 363ac5357ebSPatrick McHardy for (i = 0; i < PF_MAX; i++) 364ac5357ebSPatrick McHardy kfree(nf_ct_protos[i]); 365ac5357ebSPatrick McHardy } 366