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[NETFILTER]: nf_conntrack: split out the event cache

Browse Source 
This patch splits out the event cache into its own file
nf_conntrack_ecache.c

Signed-off-by: Martin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Martin Josefsson 2006-11-29 02:35:01 +01:00 committed by David S. Miller
parent 7e5d03bb9d
commit f61801218a
12 changed files with 199 additions and 150 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
include/net/netfilter/nf_conntrack.h
View File

@ -244,87 +244,6 @@ extern int nf_conntrack_checksum;
#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
#ifdef CONFIG_NF_CONNTRACK_EVENTS
#include <linux/notifier.h>
#include <linux/interrupt.h>
#include <net/netfilter/nf_conntrack_expect.h>
struct nf_conntrack_ecache {
struct nf_conn *ct;
unsigned int events;
};
DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
#define CONNTRACK_ECACHE(x) (__get_cpu_var(nf_conntrack_ecache).x)
extern struct atomic_notifier_head nf_conntrack_chain;
extern struct atomic_notifier_head nf_conntrack_expect_chain;
static inline int nf_conntrack_register_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&nf_conntrack_chain, nb);
}
static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb);
}
static inline int
nf_conntrack_expect_register_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&nf_conntrack_expect_chain, nb);
}
static inline int
nf_conntrack_expect_unregister_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&nf_conntrack_expect_chain,
nb);
}
extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
extern void __nf_ct_event_cache_init(struct nf_conn *ct);
static inline void
nf_conntrack_event_cache(enum ip_conntrack_events event,
const struct sk_buff *skb)
{
struct nf_conn *ct = (struct nf_conn *)skb->nfct;
struct nf_conntrack_ecache *ecache;
local_bh_disable();
ecache = &__get_cpu_var(nf_conntrack_ecache);
if (ct != ecache->ct)
__nf_ct_event_cache_init(ct);
ecache->events |= event;
local_bh_enable();
}
static inline void nf_conntrack_event(enum ip_conntrack_events event,
struct nf_conn *ct)
{
if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
atomic_notifier_call_chain(&nf_conntrack_chain, event, ct);
}
static inline void
nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
struct nf_conntrack_expect *exp)
{
atomic_notifier_call_chain(&nf_conntrack_expect_chain, event, exp);
}
#else /* CONFIG_NF_CONNTRACK_EVENTS */
static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
const struct sk_buff *skb) {}
static inline void nf_conntrack_event(enum ip_conntrack_events event,
struct nf_conn *ct) {}
static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
static inline void
nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
struct nf_conntrack_expect *exp) {}
#endif /* CONFIG_NF_CONNTRACK_EVENTS */
/* no helper, no nat */
#define NF_CT_F_BASIC 0
/* for helper */

1
include/net/netfilter/nf_conntrack_core.h
View File

@ -15,6 +15,7 @@
#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_protocol.h>
#include <net/netfilter/nf_conntrack_ecache.h>
/* This header is used to share core functionality between the
standalone connection tracking module, and the compatibility layer's use

95
include/net/netfilter/nf_conntrack_ecache.h Normal file
View File

@ -0,0 +1,95 @@
/*
* connection tracking event cache.
*/
#ifndef _NF_CONNTRACK_ECACHE_H
#define _NF_CONNTRACK_ECACHE_H
#include <net/netfilter/nf_conntrack.h>
#include <linux/notifier.h>
#include <linux/interrupt.h>
#include <net/netfilter/nf_conntrack_expect.h>
#ifdef CONFIG_NF_CONNTRACK_EVENTS
struct nf_conntrack_ecache {
struct nf_conn *ct;
unsigned int events;
};
DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
#define CONNTRACK_ECACHE(x) (__get_cpu_var(nf_conntrack_ecache).x)
extern struct atomic_notifier_head nf_conntrack_chain;
extern struct atomic_notifier_head nf_conntrack_expect_chain;
static inline int nf_conntrack_register_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&nf_conntrack_chain, nb);
}
static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb);
}
static inline int
nf_conntrack_expect_register_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&nf_conntrack_expect_chain, nb);
}
static inline int
nf_conntrack_expect_unregister_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&nf_conntrack_expect_chain,
nb);
}
extern void nf_ct_deliver_cached_events(const struct nf_conn *ct);
extern void __nf_ct_event_cache_init(struct nf_conn *ct);
extern void nf_ct_event_cache_flush(void);
static inline void
nf_conntrack_event_cache(enum ip_conntrack_events event,
const struct sk_buff *skb)
{
struct nf_conn *ct = (struct nf_conn *)skb->nfct;
struct nf_conntrack_ecache *ecache;
local_bh_disable();
ecache = &__get_cpu_var(nf_conntrack_ecache);
if (ct != ecache->ct)
__nf_ct_event_cache_init(ct);
ecache->events |= event;
local_bh_enable();
}
static inline void nf_conntrack_event(enum ip_conntrack_events event,
struct nf_conn *ct)
{
if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
atomic_notifier_call_chain(&nf_conntrack_chain, event, ct);
}
static inline void
nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
struct nf_conntrack_expect *exp)
{
atomic_notifier_call_chain(&nf_conntrack_expect_chain, event, exp);
}
#else /* CONFIG_NF_CONNTRACK_EVENTS */
static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
const struct sk_buff *skb) {}
static inline void nf_conntrack_event(enum ip_conntrack_events event,
struct nf_conn *ct) {}
static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
static inline void
nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
struct nf_conntrack_expect *exp) {}
static inline void nf_ct_event_cache_flush(void) {}
#endif /* CONFIG_NF_CONNTRACK_EVENTS */
#endif /*_NF_CONNTRACK_ECACHE_H*/

4
net/netfilter/Makefile
View File

@ -1,5 +1,7 @@
netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o
nf_conntrack-objs := 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_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

67
net/netfilter/nf_conntrack_core.c
View File

@ -85,73 +85,6 @@ static int nf_conntrack_vmalloc __read_mostly;
static unsigned int nf_conntrack_next_id;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
ATOMIC_NOTIFIER_HEAD(nf_conntrack_chain);
ATOMIC_NOTIFIER_HEAD(nf_conntrack_expect_chain);
DEFINE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
/* deliver cached events and clear cache entry - must be called with locally
* disabled softirqs */
static inline void
__nf_ct_deliver_cached_events(struct nf_conntrack_ecache *ecache)
{
DEBUGP("ecache: delivering events for %p\n", ecache->ct);
if (nf_ct_is_confirmed(ecache->ct) && !nf_ct_is_dying(ecache->ct)
&& ecache->events)
atomic_notifier_call_chain(&nf_conntrack_chain, ecache->events,
ecache->ct);
ecache->events = 0;
nf_ct_put(ecache->ct);
ecache->ct = NULL;
}
/* Deliver all cached events for a particular conntrack. This is called
* by code prior to async packet handling for freeing the skb */
void nf_ct_deliver_cached_events(const struct nf_conn *ct)
{
struct nf_conntrack_ecache *ecache;
local_bh_disable();
ecache = &__get_cpu_var(nf_conntrack_ecache);
if (ecache->ct == ct)
__nf_ct_deliver_cached_events(ecache);
local_bh_enable();
}
/* Deliver cached events for old pending events, if current conntrack != old */
void __nf_ct_event_cache_init(struct nf_conn *ct)
{
struct nf_conntrack_ecache *ecache;
/* take care of delivering potentially old events */
ecache = &__get_cpu_var(nf_conntrack_ecache);
BUG_ON(ecache->ct == ct);
if (ecache->ct)
__nf_ct_deliver_cached_events(ecache);
/* initialize for this conntrack/packet */
ecache->ct = ct;
nf_conntrack_get(&ct->ct_general);
}
/* flush the event cache - touches other CPU's data and must not be called
* while packets are still passing through the code */
static void nf_ct_event_cache_flush(void)
{
struct nf_conntrack_ecache *ecache;
int cpu;
for_each_possible_cpu(cpu) {
ecache = &per_cpu(nf_conntrack_ecache, cpu);
if (ecache->ct)
nf_ct_put(ecache->ct);
}
}
#else
static inline void nf_ct_event_cache_flush(void) {}
#endif /* CONFIG_NF_CONNTRACK_EVENTS */
DEFINE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
EXPORT_PER_CPU_SYMBOL(nf_conntrack_stat);

91
net/netfilter/nf_conntrack_ecache.c Normal file
View File

@ -0,0 +1,91 @@
/* Event cache for netfilter. */
/* (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/skbuff.h>
#include <linux/vmalloc.h>
#include <linux/stddef.h>
#include <linux/err.h>
#include <linux/percpu.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_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_core.h>
ATOMIC_NOTIFIER_HEAD(nf_conntrack_chain);
ATOMIC_NOTIFIER_HEAD(nf_conntrack_expect_chain);
DEFINE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
/* deliver cached events and clear cache entry - must be called with locally
* disabled softirqs */
static inline void
__nf_ct_deliver_cached_events(struct nf_conntrack_ecache *ecache)
{
if (nf_ct_is_confirmed(ecache->ct) && !nf_ct_is_dying(ecache->ct)
&& ecache->events)
atomic_notifier_call_chain(&nf_conntrack_chain, ecache->events,
ecache->ct);
ecache->events = 0;
nf_ct_put(ecache->ct);
ecache->ct = NULL;
}
/* Deliver all cached events for a particular conntrack. This is called
* by code prior to async packet handling for freeing the skb */
void nf_ct_deliver_cached_events(const struct nf_conn *ct)
{
struct nf_conntrack_ecache *ecache;
local_bh_disable();
ecache = &__get_cpu_var(nf_conntrack_ecache);
if (ecache->ct == ct)
__nf_ct_deliver_cached_events(ecache);
local_bh_enable();
}
/* Deliver cached events for old pending events, if current conntrack != old */
void __nf_ct_event_cache_init(struct nf_conn *ct)
{
struct nf_conntrack_ecache *ecache;
/* take care of delivering potentially old events */
ecache = &__get_cpu_var(nf_conntrack_ecache);
BUG_ON(ecache->ct == ct);
if (ecache->ct)
__nf_ct_deliver_cached_events(ecache);
/* initialize for this conntrack/packet */
ecache->ct = ct;
nf_conntrack_get(&ct->ct_general);
}
/* flush the event cache - touches other CPU's data and must not be called
* while packets are still passing through the code */
void nf_ct_event_cache_flush(void)
{
struct nf_conntrack_ecache *ecache;
int cpu;
for_each_possible_cpu(cpu) {
ecache = &per_cpu(nf_conntrack_ecache, cpu);
if (ecache->ct)
nf_ct_put(ecache->ct);
}
}

1
net/netfilter/nf_conntrack_ftp.c
View File

@ -27,6 +27,7 @@
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <linux/netfilter/nf_conntrack_ftp.h>

1
net/netfilter/nf_conntrack_proto_sctp.c
View File

@ -33,6 +33,7 @@
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_protocol.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#if 0
#define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)

1
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -43,6 +43,7 @@
#include <linux/netfilter_ipv6.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_protocol.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#if 0
#define DEBUGP printk

2
net/netfilter/nf_conntrack_proto_udp.c
View File

@ -22,10 +22,12 @@
#include <linux/ipv6.h>
#include <net/ip6_checksum.h>
#include <net/checksum.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <net/netfilter/nf_conntrack_protocol.h>
#include <net/netfilter/nf_conntrack_ecache.h>
unsigned int nf_ct_udp_timeout __read_mostly = 30*HZ;
unsigned int nf_ct_udp_timeout_stream __read_mostly = 180*HZ;

2
net/netfilter/nf_conntrack_standalone.c
View File

@ -33,9 +33,9 @@
#define ASSERT_WRITE_LOCK(x)
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.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_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>

3
net/netfilter/xt_CONNMARK.c
View File

@ -31,6 +31,9 @@ MODULE_ALIAS("ipt_CONNMARK");
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CONNMARK.h>
#include <net/netfilter/nf_conntrack_compat.h>
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
#include <net/netfilter/nf_conntrack_ecache.h>
#endif
static unsigned int
target(struct sk_buff **pskb,