blob: 5af381f9fe3da9b30729b01d1f5a2ebbf4328696 [file] [log] [blame]
/* This file contains all the functions required for the standalone
nf_conntrack module.
These are not required by the compatibility layer.
*/
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
* - generalize L3 protocol dependent part.
*
* Derived from net/ipv4/netfilter/ip_conntrack_standalone.c
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/percpu.h>
#include <linux/netdevice.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#define ASSERT_READ_LOCK(x)
#define ASSERT_WRITE_LOCK(x)
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_protocol.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <linux/netfilter_ipv4/listhelp.h>
#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif
MODULE_LICENSE("GPL");
extern atomic_t nf_conntrack_count;
DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
static int kill_l3proto(struct nf_conn *i, void *data)
{
return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
((struct nf_conntrack_l3proto *)data)->l3proto);
}
static int kill_proto(struct nf_conn *i, void *data)
{
struct nf_conntrack_protocol *proto;
proto = (struct nf_conntrack_protocol *)data;
return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
proto->proto) &&
(i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
proto->l3proto);
}
#ifdef CONFIG_PROC_FS
static int
print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
struct nf_conntrack_l3proto *l3proto,
struct nf_conntrack_protocol *proto)
{
return l3proto->print_tuple(s, tuple) || proto->print_tuple(s, tuple);
}
#ifdef CONFIG_NF_CT_ACCT
static unsigned int
seq_print_counters(struct seq_file *s,
const struct ip_conntrack_counter *counter)
{
return seq_printf(s, "packets=%llu bytes=%llu ",
(unsigned long long)counter->packets,
(unsigned long long)counter->bytes);
}
#else
#define seq_print_counters(x, y) 0
#endif
struct ct_iter_state {
unsigned int bucket;
};
static struct list_head *ct_get_first(struct seq_file *seq)
{
struct ct_iter_state *st = seq->private;
for (st->bucket = 0;
st->bucket < nf_conntrack_htable_size;
st->bucket++) {
if (!list_empty(&nf_conntrack_hash[st->bucket]))
return nf_conntrack_hash[st->bucket].next;
}
return NULL;
}
static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
{
struct ct_iter_state *st = seq->private;
head = head->next;
while (head == &nf_conntrack_hash[st->bucket]) {
if (++st->bucket >= nf_conntrack_htable_size)
return NULL;
head = nf_conntrack_hash[st->bucket].next;
}
return head;
}
static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
{
struct list_head *head = ct_get_first(seq);
if (head)
while (pos && (head = ct_get_next(seq, head)))
pos--;
return pos ? NULL : head;
}
static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
{
read_lock_bh(&nf_conntrack_lock);
return ct_get_idx(seq, *pos);
}
static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
(*pos)++;
return ct_get_next(s, v);
}
static void ct_seq_stop(struct seq_file *s, void *v)
{
read_unlock_bh(&nf_conntrack_lock);
}
/* return 0 on success, 1 in case of error */
static int ct_seq_show(struct seq_file *s, void *v)
{
const struct nf_conntrack_tuple_hash *hash = v;
const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_protocol *proto;
ASSERT_READ_LOCK(&nf_conntrack_lock);
NF_CT_ASSERT(conntrack);
/* we only want to print DIR_ORIGINAL */
if (NF_CT_DIRECTION(hash))
return 0;
l3proto = nf_ct_find_l3proto(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.src.l3num);
NF_CT_ASSERT(l3proto);
proto = nf_ct_find_proto(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.src.l3num,
conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.dst.protonum);
NF_CT_ASSERT(proto);
if (seq_printf(s, "%-8s %u %-8s %u %ld ",
l3proto->name,
conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
proto->name,
conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
timer_pending(&conntrack->timeout)
? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
return -ENOSPC;
if (l3proto->print_conntrack(s, conntrack))
return -ENOSPC;
if (proto->print_conntrack(s, conntrack))
return -ENOSPC;
if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
l3proto, proto))
return -ENOSPC;
if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
return -ENOSPC;
if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
if (seq_printf(s, "[UNREPLIED] "))
return -ENOSPC;
if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
l3proto, proto))
return -ENOSPC;
if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
return -ENOSPC;
if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
if (seq_printf(s, "[ASSURED] "))
return -ENOSPC;
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (seq_printf(s, "mark=%u ", conntrack->mark))
return -ENOSPC;
#endif
if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
return -ENOSPC;
return 0;
}
static struct seq_operations ct_seq_ops = {
.start = ct_seq_start,
.next = ct_seq_next,
.stop = ct_seq_stop,
.show = ct_seq_show
};
static int ct_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
struct ct_iter_state *st;
int ret;
st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
if (st == NULL)
return -ENOMEM;
ret = seq_open(file, &ct_seq_ops);
if (ret)
goto out_free;
seq = file->private_data;
seq->private = st;
memset(st, 0, sizeof(struct ct_iter_state));
return ret;
out_free:
kfree(st);
return ret;
}
static struct file_operations ct_file_ops = {
.owner = THIS_MODULE,
.open = ct_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
/* expects */
static void *exp_seq_start(struct seq_file *s, loff_t *pos)
{
struct list_head *e = &nf_conntrack_expect_list;
loff_t i;
/* strange seq_file api calls stop even if we fail,
* thus we need to grab lock since stop unlocks */
read_lock_bh(&nf_conntrack_lock);
if (list_empty(e))
return NULL;
for (i = 0; i <= *pos; i++) {
e = e->next;
if (e == &nf_conntrack_expect_list)
return NULL;
}
return e;
}
static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct list_head *e = v;
++*pos;
e = e->next;
if (e == &nf_conntrack_expect_list)
return NULL;
return e;
}
static void exp_seq_stop(struct seq_file *s, void *v)
{
read_unlock_bh(&nf_conntrack_lock);
}
static int exp_seq_show(struct seq_file *s, void *v)
{
struct nf_conntrack_expect *expect = v;
if (expect->timeout.function)
seq_printf(s, "%ld ", timer_pending(&expect->timeout)
? (long)(expect->timeout.expires - jiffies)/HZ : 0);
else
seq_printf(s, "- ");
seq_printf(s, "l3proto = %u proto=%u ",
expect->tuple.src.l3num,
expect->tuple.dst.protonum);
print_tuple(s, &expect->tuple,
nf_ct_find_l3proto(expect->tuple.src.l3num),
nf_ct_find_proto(expect->tuple.src.l3num,
expect->tuple.dst.protonum));
return seq_putc(s, '\n');
}
static struct seq_operations exp_seq_ops = {
.start = exp_seq_start,
.next = exp_seq_next,
.stop = exp_seq_stop,
.show = exp_seq_show
};
static int exp_open(struct inode *inode, struct file *file)
{
return seq_open(file, &exp_seq_ops);
}
static struct file_operations exp_file_ops = {
.owner = THIS_MODULE,
.open = exp_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release
};
static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
{
int cpu;
if (*pos == 0)
return SEQ_START_TOKEN;
for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
if (!cpu_possible(cpu))
continue;
*pos = cpu + 1;
return &per_cpu(nf_conntrack_stat, cpu);
}
return NULL;
}
static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
int cpu;
for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
if (!cpu_possible(cpu))
continue;
*pos = cpu + 1;
return &per_cpu(nf_conntrack_stat, cpu);
}
return NULL;
}
static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
{
}
static int ct_cpu_seq_show(struct seq_file *seq, void *v)
{
unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
struct ip_conntrack_stat *st = v;
if (v == SEQ_START_TOKEN) {
seq_printf(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete\n");
return 0;
}
seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
"%08x %08x %08x %08x %08x %08x %08x %08x \n",
nr_conntracks,
st->searched,
st->found,
st->new,
st->invalid,
st->ignore,
st->delete,
st->delete_list,
st->insert,
st->insert_failed,
st->drop,
st->early_drop,
st->error,
st->expect_new,
st->expect_create,
st->expect_delete
);
return 0;
}
static struct seq_operations ct_cpu_seq_ops = {
.start = ct_cpu_seq_start,
.next = ct_cpu_seq_next,
.stop = ct_cpu_seq_stop,
.show = ct_cpu_seq_show,
};
static int ct_cpu_seq_open(struct inode *inode, struct file *file)
{
return seq_open(file, &ct_cpu_seq_ops);
}
static struct file_operations ct_cpu_seq_fops = {
.owner = THIS_MODULE,
.open = ct_cpu_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
#endif /* CONFIG_PROC_FS */
/* Sysctl support */
#ifdef CONFIG_SYSCTL
/* From nf_conntrack_core.c */
extern int nf_conntrack_max;
extern unsigned int nf_conntrack_htable_size;
/* From nf_conntrack_proto_tcp.c */
extern unsigned long nf_ct_tcp_timeout_syn_sent;
extern unsigned long nf_ct_tcp_timeout_syn_recv;
extern unsigned long nf_ct_tcp_timeout_established;
extern unsigned long nf_ct_tcp_timeout_fin_wait;
extern unsigned long nf_ct_tcp_timeout_close_wait;
extern unsigned long nf_ct_tcp_timeout_last_ack;
extern unsigned long nf_ct_tcp_timeout_time_wait;
extern unsigned long nf_ct_tcp_timeout_close;
extern unsigned long nf_ct_tcp_timeout_max_retrans;
extern int nf_ct_tcp_loose;
extern int nf_ct_tcp_be_liberal;
extern int nf_ct_tcp_max_retrans;
/* From nf_conntrack_proto_udp.c */
extern unsigned long nf_ct_udp_timeout;
extern unsigned long nf_ct_udp_timeout_stream;
/* From nf_conntrack_proto_generic.c */
extern unsigned long nf_ct_generic_timeout;
/* Log invalid packets of a given protocol */
static int log_invalid_proto_min = 0;
static int log_invalid_proto_max = 255;
static struct ctl_table_header *nf_ct_sysctl_header;
static ctl_table nf_ct_sysctl_table[] = {
{
.ctl_name = NET_NF_CONNTRACK_MAX,
.procname = "nf_conntrack_max",
.data = &nf_conntrack_max,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = NET_NF_CONNTRACK_COUNT,
.procname = "nf_conntrack_count",
.data = &nf_conntrack_count,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = NET_NF_CONNTRACK_BUCKETS,
.procname = "nf_conntrack_buckets",
.data = &nf_conntrack_htable_size,
.maxlen = sizeof(unsigned int),
.mode = 0444,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
.procname = "nf_conntrack_tcp_timeout_syn_sent",
.data = &nf_ct_tcp_timeout_syn_sent,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
.procname = "nf_conntrack_tcp_timeout_syn_recv",
.data = &nf_ct_tcp_timeout_syn_recv,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
.procname = "nf_conntrack_tcp_timeout_established",
.data = &nf_ct_tcp_timeout_established,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
.procname = "nf_conntrack_tcp_timeout_fin_wait",
.data = &nf_ct_tcp_timeout_fin_wait,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
.procname = "nf_conntrack_tcp_timeout_close_wait",
.data = &nf_ct_tcp_timeout_close_wait,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
.procname = "nf_conntrack_tcp_timeout_last_ack",
.data = &nf_ct_tcp_timeout_last_ack,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
.procname = "nf_conntrack_tcp_timeout_time_wait",
.data = &nf_ct_tcp_timeout_time_wait,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
.procname = "nf_conntrack_tcp_timeout_close",
.data = &nf_ct_tcp_timeout_close,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_UDP_TIMEOUT,
.procname = "nf_conntrack_udp_timeout",
.data = &nf_ct_udp_timeout,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
.procname = "nf_conntrack_udp_timeout_stream",
.data = &nf_ct_udp_timeout_stream,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_GENERIC_TIMEOUT,
.procname = "nf_conntrack_generic_timeout",
.data = &nf_ct_generic_timeout,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_LOG_INVALID,
.procname = "nf_conntrack_log_invalid",
.data = &nf_ct_log_invalid,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &log_invalid_proto_min,
.extra2 = &log_invalid_proto_max,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
.procname = "nf_conntrack_tcp_timeout_max_retrans",
.data = &nf_ct_tcp_timeout_max_retrans,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_LOOSE,
.procname = "nf_conntrack_tcp_loose",
.data = &nf_ct_tcp_loose,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL,
.procname = "nf_conntrack_tcp_be_liberal",
.data = &nf_ct_tcp_be_liberal,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS,
.procname = "nf_conntrack_tcp_max_retrans",
.data = &nf_ct_tcp_max_retrans,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{ .ctl_name = 0 }
};
#define NET_NF_CONNTRACK_MAX 2089
static ctl_table nf_ct_netfilter_table[] = {
{
.ctl_name = NET_NETFILTER,
.procname = "netfilter",
.mode = 0555,
.child = nf_ct_sysctl_table,
},
{
.ctl_name = NET_NF_CONNTRACK_MAX,
.procname = "nf_conntrack_max",
.data = &nf_conntrack_max,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{ .ctl_name = 0 }
};
static ctl_table nf_ct_net_table[] = {
{
.ctl_name = CTL_NET,
.procname = "net",
.mode = 0555,
.child = nf_ct_netfilter_table,
},
{ .ctl_name = 0 }
};
EXPORT_SYMBOL(nf_ct_log_invalid);
#endif /* CONFIG_SYSCTL */
static int init_or_cleanup(int init)
{
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *proc, *proc_exp, *proc_stat;
#endif
int ret = 0;
if (!init) goto cleanup;
ret = nf_conntrack_init();
if (ret < 0)
goto cleanup_nothing;
#ifdef CONFIG_PROC_FS
proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
if (!proc) goto cleanup_init;
proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
&exp_file_ops);
if (!proc_exp) goto cleanup_proc;
proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
if (!proc_stat)
goto cleanup_proc_exp;
proc_stat->proc_fops = &ct_cpu_seq_fops;
proc_stat->owner = THIS_MODULE;
#endif
#ifdef CONFIG_SYSCTL
nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
if (nf_ct_sysctl_header == NULL) {
printk("nf_conntrack: can't register to sysctl.\n");
ret = -ENOMEM;
goto cleanup_proc_stat;
}
#endif
return ret;
cleanup:
#ifdef CONFIG_SYSCTL
unregister_sysctl_table(nf_ct_sysctl_header);
cleanup_proc_stat:
#endif
#ifdef CONFIG_PROC_FS
remove_proc_entry("nf_conntrack", proc_net_stat);
cleanup_proc_exp:
proc_net_remove("nf_conntrack_expect");
cleanup_proc:
proc_net_remove("nf_conntrack");
cleanup_init:
#endif /* CNFIG_PROC_FS */
nf_conntrack_cleanup();
cleanup_nothing:
return ret;
}
int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
{
int ret = 0;
write_lock_bh(&nf_conntrack_lock);
if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_generic_l3proto) {
ret = -EBUSY;
goto out;
}
nf_ct_l3protos[proto->l3proto] = proto;
out:
write_unlock_bh(&nf_conntrack_lock);
return ret;
}
void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
{
write_lock_bh(&nf_conntrack_lock);
nf_ct_l3protos[proto->l3proto] = &nf_conntrack_generic_l3proto;
write_unlock_bh(&nf_conntrack_lock);
/* Somebody could be still looking at the proto in bh. */
synchronize_net();
/* Remove all contrack entries for this protocol */
nf_ct_iterate_cleanup(kill_l3proto, proto);
}
/* FIXME: Allow NULL functions and sub in pointers to generic for
them. --RR */
int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto)
{
int ret = 0;
retry:
write_lock_bh(&nf_conntrack_lock);
if (nf_ct_protos[proto->l3proto]) {
if (nf_ct_protos[proto->l3proto][proto->proto]
!= &nf_conntrack_generic_protocol) {
ret = -EBUSY;
goto out_unlock;
}
} else {
/* l3proto may be loaded latter. */
struct nf_conntrack_protocol **proto_array;
int i;
write_unlock_bh(&nf_conntrack_lock);
proto_array = (struct nf_conntrack_protocol **)
kmalloc(MAX_NF_CT_PROTO *
sizeof(struct nf_conntrack_protocol *),
GFP_KERNEL);
if (proto_array == NULL) {
ret = -ENOMEM;
goto out;
}
for (i = 0; i < MAX_NF_CT_PROTO; i++)
proto_array[i] = &nf_conntrack_generic_protocol;
write_lock_bh(&nf_conntrack_lock);
if (nf_ct_protos[proto->l3proto]) {
/* bad timing, but no problem */
write_unlock_bh(&nf_conntrack_lock);
kfree(proto_array);
} else {
nf_ct_protos[proto->l3proto] = proto_array;
write_unlock_bh(&nf_conntrack_lock);
}
/*
* Just once because array is never freed until unloading
* nf_conntrack.ko
*/
goto retry;
}
nf_ct_protos[proto->l3proto][proto->proto] = proto;
out_unlock:
write_unlock_bh(&nf_conntrack_lock);
out:
return ret;
}
void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto)
{
write_lock_bh(&nf_conntrack_lock);
nf_ct_protos[proto->l3proto][proto->proto]
= &nf_conntrack_generic_protocol;
write_unlock_bh(&nf_conntrack_lock);
/* Somebody could be still looking at the proto in bh. */
synchronize_net();
/* Remove all contrack entries for this protocol */
nf_ct_iterate_cleanup(kill_proto, proto);
}
static int __init init(void)
{
return init_or_cleanup(1);
}
static void __exit fini(void)
{
init_or_cleanup(0);
}
module_init(init);
module_exit(fini);
/* Some modules need us, but don't depend directly on any symbol.
They should call this. */
void need_nf_conntrack(void)
{
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
EXPORT_SYMBOL_GPL(nf_conntrack_chain);
EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
#endif
EXPORT_SYMBOL(nf_conntrack_l3proto_register);
EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
EXPORT_SYMBOL(nf_conntrack_protocol_register);
EXPORT_SYMBOL(nf_conntrack_protocol_unregister);
EXPORT_SYMBOL(nf_ct_invert_tuplepr);
EXPORT_SYMBOL(nf_conntrack_alter_reply);
EXPORT_SYMBOL(nf_conntrack_destroyed);
EXPORT_SYMBOL(need_nf_conntrack);
EXPORT_SYMBOL(nf_conntrack_helper_register);
EXPORT_SYMBOL(nf_conntrack_helper_unregister);
EXPORT_SYMBOL(nf_ct_iterate_cleanup);
EXPORT_SYMBOL(__nf_ct_refresh_acct);
EXPORT_SYMBOL(nf_ct_protos);
EXPORT_SYMBOL(nf_ct_find_proto);
EXPORT_SYMBOL(nf_ct_l3protos);
EXPORT_SYMBOL(nf_conntrack_expect_alloc);
EXPORT_SYMBOL(nf_conntrack_expect_put);
EXPORT_SYMBOL(nf_conntrack_expect_related);
EXPORT_SYMBOL(nf_conntrack_unexpect_related);
EXPORT_SYMBOL(nf_conntrack_tuple_taken);
EXPORT_SYMBOL(nf_conntrack_htable_size);
EXPORT_SYMBOL(nf_conntrack_lock);
EXPORT_SYMBOL(nf_conntrack_hash);
EXPORT_SYMBOL(nf_conntrack_untracked);
EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
#ifdef CONFIG_IP_NF_NAT_NEEDED
EXPORT_SYMBOL(nf_conntrack_tcp_update);
#endif
EXPORT_SYMBOL(__nf_conntrack_confirm);
EXPORT_SYMBOL(nf_ct_get_tuple);
EXPORT_SYMBOL(nf_ct_invert_tuple);
EXPORT_SYMBOL(nf_conntrack_in);
EXPORT_SYMBOL(__nf_conntrack_attach);