Commit 8f03dea5 authored by Martin Josefsson's avatar Martin Josefsson Committed by David S. Miller
Browse files

[NETFILTER]: nf_conntrack: split out protocol handling



This patch splits out L3/L4 protocol handling into its own file
nf_conntrack_proto.c
Signed-off-by: default avatarMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
parent f6180121
netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o
nf_conntrack-y := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_helper.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o
nf_conntrack-y := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_helper.o nf_conntrack_proto.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o
nf_conntrack-$(CONFIG_NF_CONNTRACK_EVENTS) += nf_conntrack_ecache.o
obj-$(CONFIG_NETFILTER) = netfilter.o
......
......@@ -73,8 +73,6 @@ DEFINE_RWLOCK(nf_conntrack_lock);
atomic_t nf_conntrack_count = ATOMIC_INIT(0);
void (*nf_conntrack_destroyed)(struct nf_conn *conntrack) = NULL;
struct nf_conntrack_protocol **nf_ct_protos[PF_MAX] __read_mostly;
struct nf_conntrack_l3proto *nf_ct_l3protos[PF_MAX] __read_mostly;
unsigned int nf_conntrack_htable_size __read_mostly = 0;
int nf_conntrack_max __read_mostly;
struct list_head *nf_conntrack_hash __read_mostly;
......@@ -115,85 +113,6 @@ DEFINE_RWLOCK(nf_ct_cache_lock);
/* This avoids calling kmem_cache_create() with same name simultaneously */
static DEFINE_MUTEX(nf_ct_cache_mutex);
extern struct nf_conntrack_protocol nf_conntrack_generic_protocol;
struct nf_conntrack_protocol *
__nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol)
{
if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL))
return &nf_conntrack_generic_protocol;
return nf_ct_protos[l3proto][protocol];
}
/* this is guaranteed to always return a valid protocol helper, since
* it falls back to generic_protocol */
struct nf_conntrack_protocol *
nf_ct_proto_find_get(u_int16_t l3proto, u_int8_t protocol)
{
struct nf_conntrack_protocol *p;
preempt_disable();
p = __nf_ct_proto_find(l3proto, protocol);
if (!try_module_get(p->me))
p = &nf_conntrack_generic_protocol;
preempt_enable();
return p;
}
void nf_ct_proto_put(struct nf_conntrack_protocol *p)
{
module_put(p->me);
}
struct nf_conntrack_l3proto *
nf_ct_l3proto_find_get(u_int16_t l3proto)
{
struct nf_conntrack_l3proto *p;
preempt_disable();
p = __nf_ct_l3proto_find(l3proto);
if (!try_module_get(p->me))
p = &nf_conntrack_generic_l3proto;
preempt_enable();
return p;
}
void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
{
module_put(p->me);
}
int
nf_ct_l3proto_try_module_get(unsigned short l3proto)
{
int ret;
struct nf_conntrack_l3proto *p;
retry: p = nf_ct_l3proto_find_get(l3proto);
if (p == &nf_conntrack_generic_l3proto) {
ret = request_module("nf_conntrack-%d", l3proto);
if (!ret)
goto retry;
return -EPROTOTYPE;
}
return 0;
}
void nf_ct_l3proto_module_put(unsigned short l3proto)
{
struct nf_conntrack_l3proto *p;
preempt_disable();
p = __nf_ct_l3proto_find(l3proto);
preempt_enable();
module_put(p->me);
}
static int nf_conntrack_hash_rnd_initted;
static unsigned int nf_conntrack_hash_rnd;
......
/* L3/L4 protocol support for nf_conntrack. */
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.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.
*/
#include <linux/types.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/vmalloc.h>
#include <linux/stddef.h>
#include <linux/err.h>
#include <linux/percpu.h>
#include <linux/moduleparam.h>
#include <linux/notifier.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#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>
struct nf_conntrack_protocol **nf_ct_protos[PF_MAX] __read_mostly;
struct nf_conntrack_l3proto *nf_ct_l3protos[PF_MAX] __read_mostly;
struct nf_conntrack_protocol *
__nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol)
{
if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL))
return &nf_conntrack_generic_protocol;
return nf_ct_protos[l3proto][protocol];
}
/* this is guaranteed to always return a valid protocol helper, since
* it falls back to generic_protocol */
struct nf_conntrack_protocol *
nf_ct_proto_find_get(u_int16_t l3proto, u_int8_t protocol)
{
struct nf_conntrack_protocol *p;
preempt_disable();
p = __nf_ct_proto_find(l3proto, protocol);
if (!try_module_get(p->me))
p = &nf_conntrack_generic_protocol;
preempt_enable();
return p;
}
void nf_ct_proto_put(struct nf_conntrack_protocol *p)
{
module_put(p->me);
}
struct nf_conntrack_l3proto *
nf_ct_l3proto_find_get(u_int16_t l3proto)
{
struct nf_conntrack_l3proto *p;
preempt_disable();
p = __nf_ct_l3proto_find(l3proto);
if (!try_module_get(p->me))
p = &nf_conntrack_generic_l3proto;
preempt_enable();
return p;
}
void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
{
module_put(p->me);
}
int
nf_ct_l3proto_try_module_get(unsigned short l3proto)
{
int ret;
struct nf_conntrack_l3proto *p;
retry: p = nf_ct_l3proto_find_get(l3proto);
if (p == &nf_conntrack_generic_l3proto) {
ret = request_module("nf_conntrack-%d", l3proto);
if (!ret)
goto retry;
return -EPROTOTYPE;
}
return 0;
}
void nf_ct_l3proto_module_put(unsigned short l3proto)
{
struct nf_conntrack_l3proto *p;
preempt_disable();
p = __nf_ct_l3proto_find(l3proto);
preempt_enable();
module_put(p->me);
}
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);
}
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);
}
......@@ -50,22 +50,6 @@ 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
int
print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
......@@ -585,106 +569,6 @@ static ctl_table nf_ct_net_table[] = {
EXPORT_SYMBOL(nf_ct_log_invalid);
#endif /* CONFIG_SYSCTL */
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 nf_conntrack_standalone_init(void)
{
#ifdef CONFIG_PROC_FS
......
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