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netfilter: nf_conntrack: prepare namespace support for l3 protocol trackers 

This patch prepares the namespace support for layer 3 protocol trackers.
Basically, this modifies the following interfaces:

* nf_ct_l3proto_[un]register_sysctl.
* nf_conntrack_l3proto_[un]register.

We add a new nf_ct_l3proto_net is used to get the pernet data of l3proto.

This adds rhe new struct nf_ip_net that is used to store the sysctl header
and l3proto_ipv4,l4proto_tcp(6),l4proto_udp(6),l4proto_icmp(v6) because the
protos such tcp and tcp6 use the same data,so making nf_ip_net as a field
of netns_ct is the easiest way to manager it.

This patch also adds init_net to struct nf_conntrack_l3proto to initial
the layer 3 protocol pernet data.

Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Gao feng 2012-05-28 21:04:10 +00:00 committed by Pablo Neira Ayuso
parent 2c352f444c
commit 524a53e5ad
5 changed files with 91 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/net/netfilter/nf_conntrack_l3proto.h
View File

@ -69,6 +69,9 @@ struct nf_conntrack_l3proto {
struct ctl_table *ctl_table;
#endif /* CONFIG_SYSCTL */
/* Init l3proto pernet data */
int (*init_net)(struct net *net);
/* Module (if any) which this is connected to. */
struct module *me;
};
@ -76,8 +79,10 @@ struct nf_conntrack_l3proto {
extern struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX];
/* Protocol registration. */
extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto);
extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto);
extern int nf_conntrack_l3proto_register(struct net *net,
struct nf_conntrack_l3proto *proto);
extern void nf_conntrack_l3proto_unregister(struct net *net,
struct nf_conntrack_l3proto *proto);
extern struct nf_conntrack_l3proto *nf_ct_l3proto_find_get(u_int16_t l3proto);
extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p);

8
include/net/netns/conntrack.h
View File

@ -20,6 +20,13 @@ struct nf_proto_net {
unsigned int users;
};
struct nf_ip_net {
#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
struct ctl_table_header *ctl_table_header;
struct ctl_table *ctl_table;
#endif
};
struct netns_ct {
atomic_t count;
unsigned int expect_count;
@ -40,6 +47,7 @@ struct netns_ct {
unsigned int sysctl_log_invalid; /* Log invalid packets */
int sysctl_auto_assign_helper;
bool auto_assign_helper_warned;
struct nf_ip_net nf_ct_proto;
#ifdef CONFIG_SYSCTL
struct ctl_table_header *sysctl_header;
struct ctl_table_header *acct_sysctl_header;

6
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
View File

@ -409,7 +409,7 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
goto cleanup_udp;
}
ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4);
ret = nf_conntrack_l3proto_register(&init_net, &nf_conntrack_l3proto_ipv4);
if (ret < 0) {
pr_err("nf_conntrack_ipv4: can't register ipv4\n");
goto cleanup_icmp;
@ -432,7 +432,7 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
#endif
cleanup_ipv4:
nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv4);
cleanup_icmp:
nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmp);
cleanup_udp:
@ -451,7 +451,7 @@ static void __exit nf_conntrack_l3proto_ipv4_fini(void)
nf_conntrack_ipv4_compat_fini();
#endif
nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv4);
nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmp);
nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_udp4);
nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_tcp4);

6
net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
View File

@ -358,7 +358,7 @@ static int __init nf_conntrack_l3proto_ipv6_init(void)
goto cleanup_udp;
}
ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv6);
ret = nf_conntrack_l3proto_register(&init_net, &nf_conntrack_l3proto_ipv6);
if (ret < 0) {
pr_err("nf_conntrack_ipv6: can't register ipv6\n");
goto cleanup_icmpv6;
@ -374,7 +374,7 @@ static int __init nf_conntrack_l3proto_ipv6_init(void)
return ret;
cleanup_ipv6:
nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv6);
cleanup_icmpv6:
nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmpv6);
cleanup_udp:
@ -388,7 +388,7 @@ static void __exit nf_conntrack_l3proto_ipv6_fini(void)
{
synchronize_net();
nf_unregister_hooks(ipv6_conntrack_ops, ARRAY_SIZE(ipv6_conntrack_ops));
nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv6);
nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmpv6);
nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_udp6);
nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_tcp6);

92
net/netfilter/nf_conntrack_proto.c
View File

@ -168,31 +168,57 @@ static int kill_l4proto(struct nf_conn *i, void *data)
nf_ct_l3num(i) == l4proto->l3proto;
}
static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto)
static struct nf_ip_net *nf_ct_l3proto_net(struct net *net,
struct nf_conntrack_l3proto *l3proto)
{
if (l3proto->l3proto == PF_INET)
return &net->ct.nf_ct_proto;
else
return NULL;
}
static int nf_ct_l3proto_register_sysctl(struct net *net,
struct nf_conntrack_l3proto *l3proto)
{
int err = 0;
struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto);
/* nf_conntrack_l3proto_ipv6 doesn't support sysctl */
if (in == NULL)
return 0;
#ifdef CONFIG_SYSCTL
if (l3proto->ctl_table != NULL) {
err = nf_ct_register_sysctl(&init_net,
&l3proto->ctl_table_header,
#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
if (in->ctl_table != NULL) {
err = nf_ct_register_sysctl(net,
&in->ctl_table_header,
l3proto->ctl_table_path,
l3proto->ctl_table, NULL);
in->ctl_table,
NULL);
if (err < 0) {
kfree(in->ctl_table);
in->ctl_table = NULL;
}
}
#endif
return err;
}
static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto)
static void nf_ct_l3proto_unregister_sysctl(struct net *net,
struct nf_conntrack_l3proto *l3proto)
{
#ifdef CONFIG_SYSCTL
if (l3proto->ctl_table_header != NULL)
nf_ct_unregister_sysctl(&l3proto->ctl_table_header,
&l3proto->ctl_table, NULL);
struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto);
if (in == NULL)
return;
#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
if (in->ctl_table_header != NULL)
nf_ct_unregister_sysctl(&in->ctl_table_header,
&in->ctl_table,
NULL);
#endif
}
int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
static int
nf_conntrack_l3proto_register_net(struct nf_conntrack_l3proto *proto)
{
int ret = 0;
struct nf_conntrack_l3proto *old;
@ -211,10 +237,6 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
goto out_unlock;
}
ret = nf_ct_l3proto_register_sysctl(proto);
if (ret < 0)
goto out_unlock;
if (proto->nlattr_tuple_size)
proto->nla_size = 3 * proto->nlattr_tuple_size();
@ -223,13 +245,32 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
out_unlock:
mutex_unlock(&nf_ct_proto_mutex);
return ret;
}
int nf_conntrack_l3proto_register(struct net *net,
struct nf_conntrack_l3proto *proto)
{
int ret = 0;
if (net == &init_net)
ret = nf_conntrack_l3proto_register_net(proto);
if (ret < 0)
return ret;
if (proto->init_net) {
ret = proto->init_net(net);
if (ret < 0)
return ret;
}
return nf_ct_l3proto_register_sysctl(net, proto);
}
EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register);
void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
static void
nf_conntrack_l3proto_unregister_net(struct nf_conntrack_l3proto *proto)
{
struct net *net;
BUG_ON(proto->l3proto >= AF_MAX);
mutex_lock(&nf_ct_proto_mutex);
@ -238,15 +279,22 @@ void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
) != proto);
rcu_assign_pointer(nf_ct_l3protos[proto->l3proto],
&nf_conntrack_l3proto_generic);
nf_ct_l3proto_unregister_sysctl(proto);
mutex_unlock(&nf_ct_proto_mutex);
synchronize_rcu();
}
void nf_conntrack_l3proto_unregister(struct net *net,
struct nf_conntrack_l3proto *proto)
{
if (net == &init_net)
nf_conntrack_l3proto_unregister_net(proto);
nf_ct_l3proto_unregister_sysctl(net, proto);
/* Remove all contrack entries for this protocol */
rtnl_lock();
for_each_net(net)
nf_ct_iterate_cleanup(net, kill_l3proto, proto);
nf_ct_iterate_cleanup(net, kill_l3proto, proto);
rtnl_unlock();
}
EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);