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netfilter: add inet ingress support 

This patch adds the NF_INET_INGRESS pseudohook for the NFPROTO_INET
family. This is a mapping this new hook to the existing NFPROTO_NETDEV
and NF_NETDEV_INGRESS hook. The hook does not guarantee that packets are
inet only, users must filter out non-ip traffic explicitly.

This infrastructure makes it easier to support this new hook in nf_tables.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-10-08 01:14:47 +02:00
parent ddcfa710d4
commit 60a3815da7
2 changed files with 82 additions and 20 deletions
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1
include/uapi/linux/netfilter.h
View File

@ -45,6 +45,7 @@ enum nf_inet_hooks {
NF_INET_FORWARD,
NF_INET_LOCAL_OUT,
NF_INET_POST_ROUTING,
NF_INET_INGRESS,
NF_INET_NUMHOOKS
};

101
net/netfilter/core.c
View File

@ -281,6 +281,16 @@ nf_hook_entry_head(struct net *net, int pf, unsigned int hooknum,
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_bridge) <= hooknum))
return NULL;
return net->nf.hooks_bridge + hooknum;
#endif
#ifdef CONFIG_NETFILTER_INGRESS
case NFPROTO_INET:
if (WARN_ON_ONCE(hooknum != NF_INET_INGRESS))
return NULL;
if (!dev || dev_net(dev) != net) {
WARN_ON_ONCE(1);
return NULL;
}
return &dev->nf_hooks_ingress;
#endif
case NFPROTO_IPV4:
if (WARN_ON_ONCE(ARRAY_SIZE(net->nf.hooks_ipv4) <= hooknum))
@ -311,22 +321,56 @@ nf_hook_entry_head(struct net *net, int pf, unsigned int hooknum,
return NULL;
}
static int nf_ingress_check(struct net *net, const struct nf_hook_ops *reg,
int hooknum)
{
#ifndef CONFIG_NETFILTER_INGRESS
if (reg->hooknum == hooknum)
return -EOPNOTSUPP;
#endif
if (reg->hooknum != hooknum ||
!reg->dev || dev_net(reg->dev) != net)
return -EINVAL;
return 0;
}
static inline bool nf_ingress_hook(const struct nf_hook_ops *reg, int pf)
{
return pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS;
if ((pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS) ||
(pf == NFPROTO_INET && reg->hooknum == NF_INET_INGRESS))
return true;
return false;
}
static void nf_static_key_inc(const struct nf_hook_ops *reg, int pf)
{
#ifdef CONFIG_JUMP_LABEL
static_key_slow_inc(&nf_hooks_needed[pf][reg->hooknum]);
int hooknum;
if (pf == NFPROTO_INET && reg->hooknum == NF_INET_INGRESS) {
pf = NFPROTO_NETDEV;
hooknum = NF_NETDEV_INGRESS;
} else {
hooknum = reg->hooknum;
}
static_key_slow_inc(&nf_hooks_needed[pf][hooknum]);
#endif
}
static void nf_static_key_dec(const struct nf_hook_ops *reg, int pf)
{
#ifdef CONFIG_JUMP_LABEL
static_key_slow_dec(&nf_hooks_needed[pf][reg->hooknum]);
int hooknum;
if (pf == NFPROTO_INET && reg->hooknum == NF_INET_INGRESS) {
pf = NFPROTO_NETDEV;
hooknum = NF_NETDEV_INGRESS;
} else {
hooknum = reg->hooknum;
}
static_key_slow_dec(&nf_hooks_needed[pf][hooknum]);
#endif
}
@ -335,15 +379,22 @@ static int __nf_register_net_hook(struct net *net, int pf,
{
struct nf_hook_entries *p, *new_hooks;
struct nf_hook_entries __rcu **pp;
int err;
if (pf == NFPROTO_NETDEV) {
#ifndef CONFIG_NETFILTER_INGRESS
if (reg->hooknum == NF_NETDEV_INGRESS)
return -EOPNOTSUPP;
#endif
if (reg->hooknum != NF_NETDEV_INGRESS ||
!reg->dev || dev_net(reg->dev) != net)
return -EINVAL;
switch (pf) {
case NFPROTO_NETDEV:
err = nf_ingress_check(net, reg, NF_NETDEV_INGRESS);
if (err < 0)
return err;
break;
case NFPROTO_INET:
if (reg->hooknum != NF_INET_INGRESS)
break;
err = nf_ingress_check(net, reg, NF_INET_INGRESS);
if (err < 0)
return err;
break;
}
pp = nf_hook_entry_head(net, pf, reg->hooknum, reg->dev);
@ -441,8 +492,12 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *reg)
{
if (reg->pf == NFPROTO_INET) {
__nf_unregister_net_hook(net, NFPROTO_IPV4, reg);
__nf_unregister_net_hook(net, NFPROTO_IPV6, reg);
if (reg->hooknum == NF_INET_INGRESS) {
__nf_unregister_net_hook(net, NFPROTO_INET, reg);
} else {
__nf_unregister_net_hook(net, NFPROTO_IPV4, reg);
__nf_unregister_net_hook(net, NFPROTO_IPV6, reg);
}
} else {
__nf_unregister_net_hook(net, reg->pf, reg);
}
@ -467,14 +522,20 @@ int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg)
int err;
if (reg->pf == NFPROTO_INET) {
err = __nf_register_net_hook(net, NFPROTO_IPV4, reg);
if (err < 0)
return err;
if (reg->hooknum == NF_INET_INGRESS) {
err = __nf_register_net_hook(net, NFPROTO_INET, reg);
if (err < 0)
return err;
} else {
err = __nf_register_net_hook(net, NFPROTO_IPV4, reg);
if (err < 0)
return err;
err = __nf_register_net_hook(net, NFPROTO_IPV6, reg);
if (err < 0) {
__nf_unregister_net_hook(net, NFPROTO_IPV4, reg);
return err;
err = __nf_register_net_hook(net, NFPROTO_IPV6, reg);
if (err < 0) {
__nf_unregister_net_hook(net, NFPROTO_IPV4, reg);
return err;
}
}
} else {
err = __nf_register_net_hook(net, reg->pf, reg);