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netfilter: remove old pre-netns era hook api

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no more users in the tree, remove this.

The old api is racy wrt. module removal, all users have been converted
to the netns-aware api.

The old api pretended we still have global hooks but that has not been
true for a long time.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2017-07-06 23:17:44 +02:00 committed by Pablo Neira Ayuso
parent f55ce7b024
commit cf56c2f892
2 changed files with 0 additions and 152 deletions
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9
include/linux/netfilter.h
View file

@ -61,8 +61,6 @@ typedef unsigned int nf_hookfn(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state);
struct nf_hook_ops {
struct list_head list;
/* User fills in from here down. */
nf_hookfn *hook;
struct net_device *dev;
@ -160,13 +158,6 @@ int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
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);
void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
int _nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
void _nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
/* Functions to register get/setsockopt ranges (non-inclusive). You
need to check permissions yourself! */
int nf_register_sockopt(struct nf_sockopt_ops *reg);

143
net/netfilter/core.c
View file

@ -227,114 +227,6 @@ void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
}
EXPORT_SYMBOL(nf_unregister_net_hooks);
static LIST_HEAD(nf_hook_list);
static int _nf_register_hook(struct nf_hook_ops *reg)
{
struct net *net, *last;
int ret;
for_each_net(net) {
ret = nf_register_net_hook(net, reg);
if (ret && ret != -ENOENT)
goto rollback;
}
list_add_tail(&reg->list, &nf_hook_list);
return 0;
rollback:
last = net;
for_each_net(net) {
if (net == last)
break;
nf_unregister_net_hook(net, reg);
}
return ret;
}
int nf_register_hook(struct nf_hook_ops *reg)
{
int ret;
rtnl_lock();
ret = _nf_register_hook(reg);
rtnl_unlock();
return ret;
}
EXPORT_SYMBOL(nf_register_hook);
static void _nf_unregister_hook(struct nf_hook_ops *reg)
{
struct net *net;
list_del(&reg->list);
for_each_net(net)
nf_unregister_net_hook(net, reg);
}
void nf_unregister_hook(struct nf_hook_ops *reg)
{
rtnl_lock();
_nf_unregister_hook(reg);
rtnl_unlock();
}
EXPORT_SYMBOL(nf_unregister_hook);
int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n)
{
unsigned int i;
int err = 0;
for (i = 0; i < n; i++) {
err = nf_register_hook(&reg[i]);
if (err)
goto err;
}
return err;
err:
if (i > 0)
nf_unregister_hooks(reg, i);
return err;
}
EXPORT_SYMBOL(nf_register_hooks);
/* Caller MUST take rtnl_lock() */
int _nf_register_hooks(struct nf_hook_ops *reg, unsigned int n)
{
unsigned int i;
int err = 0;
for (i = 0; i < n; i++) {
err = _nf_register_hook(&reg[i]);
if (err)
goto err;
}
return err;
err:
if (i > 0)
_nf_unregister_hooks(reg, i);
return err;
}
EXPORT_SYMBOL(_nf_register_hooks);
void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n)
{
while (n-- > 0)
nf_unregister_hook(&reg[n]);
}
EXPORT_SYMBOL(nf_unregister_hooks);
/* Caller MUST take rtnl_lock */
void _nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n)
{
while (n-- > 0)
_nf_unregister_hook(&reg[n]);
}
EXPORT_SYMBOL(_nf_unregister_hooks);
/* Returns 1 if okfn() needs to be executed by the caller,
* -EPERM for NF_DROP, 0 otherwise. Caller must hold rcu_read_lock. */
int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
@ -450,37 +342,6 @@ void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
EXPORT_SYMBOL(nf_nat_decode_session_hook);
#endif
static int nf_register_hook_list(struct net *net)
{
struct nf_hook_ops *elem;
int ret;
rtnl_lock();
list_for_each_entry(elem, &nf_hook_list, list) {
ret = nf_register_net_hook(net, elem);
if (ret && ret != -ENOENT)
goto out_undo;
}
rtnl_unlock();
return 0;
out_undo:
list_for_each_entry_continue_reverse(elem, &nf_hook_list, list)
nf_unregister_net_hook(net, elem);
rtnl_unlock();
return ret;
}
static void nf_unregister_hook_list(struct net *net)
{
struct nf_hook_ops *elem;
rtnl_lock();
list_for_each_entry(elem, &nf_hook_list, list)
nf_unregister_net_hook(net, elem);
rtnl_unlock();
}
static int __net_init netfilter_net_init(struct net *net)
{
int i, h, ret;
@ -500,16 +361,12 @@ static int __net_init netfilter_net_init(struct net *net)
return -ENOMEM;
}
#endif
ret = nf_register_hook_list(net);
if (ret)
remove_proc_entry("netfilter", net->proc_net);
return ret;
}
static void __net_exit netfilter_net_exit(struct net *net)
{
nf_unregister_hook_list(net);
remove_proc_entry("netfilter", net->proc_net);
}