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Date: Thu, 8 Mar 2012 02:01:10 +0100
From: pablo@...filter.org
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 21/23] netfilter: nf_ct_ext: add timeout extension
From: Pablo Neira Ayuso <pablo@...filter.org>
This patch adds the timeout extension, which allows you to attach
specific timeout policies to flows.
This extension is only used by the template conntrack.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_conntrack_extend.h | 4 +
include/net/netfilter/nf_conntrack_timeout.h | 78 ++++++++++++++++++++++++++
net/netfilter/Kconfig | 10 +++
net/netfilter/Makefile | 1 +
net/netfilter/nf_conntrack_core.c | 7 ++
net/netfilter/nf_conntrack_timeout.c | 60 ++++++++++++++++++++
net/netfilter/nfnetlink_cttimeout.c | 10 ---
7 files changed, 160 insertions(+), 10 deletions(-)
create mode 100644 include/net/netfilter/nf_conntrack_timeout.h
create mode 100644 net/netfilter/nf_conntrack_timeout.c
diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
index 2dcf317..96755c3 100644
--- a/include/net/netfilter/nf_conntrack_extend.h
+++ b/include/net/netfilter/nf_conntrack_extend.h
@@ -20,6 +20,9 @@ enum nf_ct_ext_id {
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
NF_CT_EXT_TSTAMP,
#endif
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+ NF_CT_EXT_TIMEOUT,
+#endif
NF_CT_EXT_NUM,
};
@@ -29,6 +32,7 @@ enum nf_ct_ext_id {
#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone
#define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp
+#define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout
/* Extensions: optional stuff which isn't permanently in struct. */
struct nf_ct_ext {
diff --git a/include/net/netfilter/nf_conntrack_timeout.h b/include/net/netfilter/nf_conntrack_timeout.h
new file mode 100644
index 0000000..0e04db4
--- /dev/null
+++ b/include/net/netfilter/nf_conntrack_timeout.h
@@ -0,0 +1,78 @@
+#ifndef _NF_CONNTRACK_TIMEOUT_H
+#define _NF_CONNTRACK_TIMEOUT_H
+
+#include <net/net_namespace.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+#define CTNL_TIMEOUT_NAME_MAX 32
+
+struct ctnl_timeout {
+ struct list_head head;
+ struct rcu_head rcu_head;
+ atomic_t refcnt;
+ char name[CTNL_TIMEOUT_NAME_MAX];
+ __u16 l3num;
+ __u8 l4num;
+ char data[0];
+};
+
+struct nf_conn_timeout {
+ struct ctnl_timeout *timeout;
+};
+
+#define NF_CT_TIMEOUT_EXT_DATA(__t) (unsigned int *) &((__t)->timeout->data)
+
+static inline
+struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+ return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
+#else
+ return NULL;
+#endif
+}
+
+static inline
+struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
+ struct ctnl_timeout *timeout,
+ gfp_t gfp)
+{
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+ struct nf_conn_timeout *timeout_ext;
+
+ timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
+ if (timeout_ext == NULL)
+ return NULL;
+
+ timeout_ext->timeout = timeout;
+
+ return timeout_ext;
+#else
+ return NULL;
+#endif
+};
+
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+extern int nf_conntrack_timeout_init(struct net *net);
+extern void nf_conntrack_timeout_fini(struct net *net);
+#else
+static inline int nf_conntrack_timeout_init(struct net *net)
+{
+ return 0;
+}
+
+static inline void nf_conntrack_timeout_fini(struct net *net)
+{
+ return;
+}
+#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
+
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+extern struct ctnl_timeout *(*nf_ct_timeout_find_get_hook)(const char *name);
+extern void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout);
+#endif
+
+#endif /* _NF_CONNTRACK_TIMEOUT_H */
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f3efb65..0c6f67e 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -103,6 +103,16 @@ config NF_CONNTRACK_EVENTS
If unsure, say `N'.
+config NF_CONNTRACK_TIMEOUT
+ bool 'Connection tracking timeout'
+ depends on NETFILTER_ADVANCED
+ help
+ This option enables support for connection tracking timeout
+ extension. This allows you to attach timeout policies to flow
+ via the CT target.
+
+ If unsure, say `N'.
+
config NF_CONNTRACK_TIMESTAMP
bool 'Connection tracking timestamping'
depends on NETFILTER_ADVANCED
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index cf7cdd6..ca36765 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -1,6 +1,7 @@
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_proto.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o nf_conntrack_extend.o nf_conntrack_acct.o
+nf_conntrack-$(CONFIG_NF_CONNTRACK_TIMEOUT) += nf_conntrack_timeout.o
nf_conntrack-$(CONFIG_NF_CONNTRACK_TIMESTAMP) += nf_conntrack_timestamp.o
nf_conntrack-$(CONFIG_NF_CONNTRACK_EVENTS) += nf_conntrack_ecache.o
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index d18995e..75398c5 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -44,6 +44,7 @@
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_conntrack_timestamp.h>
+#include <net/netfilter/nf_conntrack_timeout.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
@@ -1333,6 +1334,7 @@ static void nf_conntrack_cleanup_net(struct net *net)
}
nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
+ nf_conntrack_timeout_fini(net);
nf_conntrack_ecache_fini(net);
nf_conntrack_tstamp_fini(net);
nf_conntrack_acct_fini(net);
@@ -1564,9 +1566,14 @@ static int nf_conntrack_init_net(struct net *net)
ret = nf_conntrack_ecache_init(net);
if (ret < 0)
goto err_ecache;
+ ret = nf_conntrack_timeout_init(net);
+ if (ret < 0)
+ goto err_timeout;
return 0;
+err_timeout:
+ nf_conntrack_timeout_fini(net);
err_ecache:
nf_conntrack_tstamp_fini(net);
err_tstamp:
diff --git a/net/netfilter/nf_conntrack_timeout.c b/net/netfilter/nf_conntrack_timeout.c
new file mode 100644
index 0000000..a878ce5
--- /dev/null
+++ b/net/netfilter/nf_conntrack_timeout.c
@@ -0,0 +1,60 @@
+/*
+ * (C) 2012 by Pablo Neira Ayuso <pablo@...filter.org>
+ * (C) 2012 by Vyatta Inc. <http://www.vyatta.com>
+ *
+ * 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 (or any later at your option).
+ */
+
+#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/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+#include <net/netfilter/nf_conntrack_timeout.h>
+
+struct ctnl_timeout *
+(*nf_ct_timeout_find_get_hook)(const char *name) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_ct_timeout_find_get_hook);
+
+void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_ct_timeout_put_hook);
+
+static struct nf_ct_ext_type timeout_extend __read_mostly = {
+ .len = sizeof(struct nf_conn_timeout),
+ .align = __alignof__(struct nf_conn_timeout),
+ .id = NF_CT_EXT_TIMEOUT,
+};
+
+int nf_conntrack_timeout_init(struct net *net)
+{
+ int ret = 0;
+
+ if (net_eq(net, &init_net)) {
+ ret = nf_ct_extend_register(&timeout_extend);
+ if (ret < 0) {
+ printk(KERN_ERR "nf_ct_timeout: Unable to register "
+ "timeout extension.\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+void nf_conntrack_timeout_fini(struct net *net)
+{
+ if (net_eq(net, &init_net))
+ nf_ct_extend_unregister(&timeout_extend);
+}
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index b860d52..29b9897 100644
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -37,16 +37,6 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@...filter.org>");
MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning");
-struct ctnl_timeout {
- struct list_head head;
- struct rcu_head rcu_head;
- atomic_t refcnt;
- char name[CTNL_TIMEOUT_NAME_MAX];
- __u16 l3num;
- __u8 l4num;
- char data[0];
-};
-
static LIST_HEAD(cttimeout_list);
static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
--
1.7.7.3
--
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