netfilter: nf_ct_ext: add timeout extension

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@netfilter.org>

diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
index 2dcf317..96755c3 100644 (file)
--- 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 (file)
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 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
index 0000000..a878ce5
--- /dev/null
+++ b/net/netfilter/nf_conntrack_timeout.c
@@ -0,0 +1,60 @@
+/*
+ * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.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 (file)
--- 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@netfilter.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] = {