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authorEric W. Biederman <ebiederm@xmission.com>2015-07-11 02:15:06 +0300
committerPablo Neira Ayuso <pablo@netfilter.org>2015-07-15 19:17:26 +0300
commit085db2c04557d31db61541f361bd8b4de92c9939 (patch)
treeb62e22e0613903ea366e3a5af1649869b9c5bd1d /include
parent0edcf282b0a6f38168294264837cf7d52a2f5255 (diff)
downloadlinux-085db2c04557d31db61541f361bd8b4de92c9939.tar.xz
netfilter: Per network namespace netfilter hooks.
- Add a new set of functions for registering and unregistering per network namespace hooks. - Modify the old global namespace hook functions to use the per network namespace hooks in their implementation, so their remains a single list that needs to be walked for any hook (this is important for keeping the hook priority working and for keeping the code walking the hooks simple). - Only allow registering the per netdevice hooks in the network namespace where the network device lives. - Dynamically allocate the structures in the per network namespace hook list in nf_register_net_hook, and unregister them in nf_unregister_net_hook. Dynamic allocate is required somewhere as the number of network namespaces are not fixed so we might as well allocate them in the registration function. The chain of registered hooks on any list is expected to be small so the cost of walking that list to find the entry we are unregistering should also be small. Performing the management of the dynamically allocated list entries in the registration and unregistration functions keeps the complexity from spreading. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netfilter.h14
-rw-r--r--include/net/netns/netfilter.h1
2 files changed, 12 insertions, 3 deletions
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 60e89348a91d..9bbd110ec81b 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -11,6 +11,8 @@
#include <linux/list.h>
#include <linux/static_key.h>
#include <linux/netfilter_defs.h>
+#include <linux/netdevice.h>
+#include <net/net_namespace.h>
#ifdef CONFIG_NETFILTER
static inline int NF_DROP_GETERR(int verdict)
@@ -118,6 +120,13 @@ struct nf_sockopt_ops {
};
/* Function to register/unregister hook points. */
+int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops);
+void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops);
+int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
+ unsigned int n);
+void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
+ unsigned int n);
+
int nf_register_hook(struct nf_hook_ops *reg);
void nf_unregister_hook(struct nf_hook_ops *reg);
int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
@@ -128,8 +137,6 @@ void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
int nf_register_sockopt(struct nf_sockopt_ops *reg);
void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
-extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
-
#ifdef HAVE_JUMP_LABEL
extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
@@ -167,7 +174,8 @@ static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
int (*okfn)(struct sock *, struct sk_buff *),
int thresh)
{
- struct list_head *nf_hook_list = &nf_hooks[pf][hook];
+ struct net *net = dev_net(indev ? indev : outdev);
+ struct list_head *nf_hook_list = &net->nf.hooks[pf][hook];
if (nf_hook_list_active(nf_hook_list, pf, hook)) {
struct nf_hook_state state;
diff --git a/include/net/netns/netfilter.h b/include/net/netns/netfilter.h
index 532e4ba64f49..38aa4983e2a9 100644
--- a/include/net/netns/netfilter.h
+++ b/include/net/netns/netfilter.h
@@ -14,5 +14,6 @@ struct netns_nf {
#ifdef CONFIG_SYSCTL
struct ctl_table_header *nf_log_dir_header;
#endif
+ struct list_head hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
};
#endif