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netfilter: nf_tables_inet: don't use multihook infrastructure anymore

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Use new native NFPROTO_INET support in netfilter core, this gets rid of
ad-hoc code in the nf_tables API codebase.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2017-12-09 15:36:24 +01:00
parent cb7ccd835e
commit 12355d3670
5 changed files with 59 additions and 19 deletions
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2
include/net/netfilter/nf_tables_ipv4.h
View file

@ -53,6 +53,4 @@ static inline void nft_set_pktinfo_ipv4_validate(struct nft_pktinfo *pkt,
nft_set_pktinfo_unspec(pkt, skb); nft_set_pktinfo_unspec(pkt, skb);
} }
extern struct nft_af_info nft_af_ipv4;
#endif #endif

2
include/net/netfilter/nf_tables_ipv6.h
View file

@ -69,6 +69,4 @@ static inline void nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt,
nft_set_pktinfo_unspec(pkt, skb); nft_set_pktinfo_unspec(pkt, skb);
} }
extern struct nft_af_info nft_af_ipv6;
#endif #endif

3
net/ipv4/netfilter/nf_tables_ipv4.c
View file

@ -45,7 +45,7 @@ static unsigned int nft_ipv4_output(void *priv,
return nft_do_chain_ipv4(priv, skb, state); return nft_do_chain_ipv4(priv, skb, state);
} }
struct nft_af_info nft_af_ipv4 __read_mostly = { static struct nft_af_info nft_af_ipv4 __read_mostly = {
.family = NFPROTO_IPV4, .family = NFPROTO_IPV4,
.nhooks = NF_INET_NUMHOOKS, .nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE, .owner = THIS_MODULE,
@ -58,7 +58,6 @@ struct nft_af_info nft_af_ipv4 __read_mostly = {
[NF_INET_POST_ROUTING] = nft_do_chain_ipv4, [NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
}, },
}; };
EXPORT_SYMBOL_GPL(nft_af_ipv4);
static int nf_tables_ipv4_init_net(struct net *net) static int nf_tables_ipv4_init_net(struct net *net)
{ {

3
net/ipv6/netfilter/nf_tables_ipv6.c
View file

@ -42,7 +42,7 @@ static unsigned int nft_ipv6_output(void *priv,
return nft_do_chain_ipv6(priv, skb, state); return nft_do_chain_ipv6(priv, skb, state);
} }
struct nft_af_info nft_af_ipv6 __read_mostly = { static struct nft_af_info nft_af_ipv6 __read_mostly = {
.family = NFPROTO_IPV6, .family = NFPROTO_IPV6,
.nhooks = NF_INET_NUMHOOKS, .nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE, .owner = THIS_MODULE,
@ -55,7 +55,6 @@ struct nft_af_info nft_af_ipv6 __read_mostly = {
[NF_INET_POST_ROUTING] = nft_do_chain_ipv6, [NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
}, },
}; };
EXPORT_SYMBOL_GPL(nft_af_ipv6);
static int nf_tables_ipv6_init_net(struct net *net) static int nf_tables_ipv6_init_net(struct net *net)
{ {

68
net/netfilter/nf_tables_inet.c
View file

@ -9,6 +9,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/ip.h> #include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/netfilter_ipv4.h> #include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h> #include <linux/netfilter_ipv6.h>
#include <net/netfilter/nf_tables.h> #include <net/netfilter/nf_tables.h>
@ -16,26 +17,71 @@
#include <net/netfilter/nf_tables_ipv6.h> #include <net/netfilter/nf_tables_ipv6.h>
#include <net/ip.h> #include <net/ip.h>
static void nft_inet_hook_ops_init(struct nf_hook_ops *ops, unsigned int n) static unsigned int nft_do_chain_inet(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{ {
struct nft_af_info *afi; struct nft_pktinfo pkt;
if (n == 1) nft_set_pktinfo(&pkt, skb, state);
afi = &nft_af_ipv4;
else
afi = &nft_af_ipv6;
ops->pf = afi->family; switch (state->pf) {
if (afi->hooks[ops->hooknum]) case NFPROTO_IPV4:
ops->hook = afi->hooks[ops->hooknum]; nft_set_pktinfo_ipv4(&pkt, skb);
break;
case NFPROTO_IPV6:
nft_set_pktinfo_ipv6(&pkt, skb);
break;
default:
break;
}
return nft_do_chain(&pkt, priv);
}
static unsigned int nft_inet_output(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, skb, state);
switch (state->pf) {
case NFPROTO_IPV4:
if (unlikely(skb->len < sizeof(struct iphdr) ||
ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
if (net_ratelimit())
pr_info("ignoring short SOCK_RAW packet\n");
return NF_ACCEPT;
}
nft_set_pktinfo_ipv4(&pkt, skb);
break;
case NFPROTO_IPV6:
if (unlikely(skb->len < sizeof(struct ipv6hdr))) {
if (net_ratelimit())
pr_info("ignoring short SOCK_RAW packet\n");
return NF_ACCEPT;
}
nft_set_pktinfo_ipv6(&pkt, skb);
break;
default:
break;
}
return nft_do_chain(&pkt, priv);
} }
static struct nft_af_info nft_af_inet __read_mostly = { static struct nft_af_info nft_af_inet __read_mostly = {
.family = NFPROTO_INET, .family = NFPROTO_INET,
.nhooks = NF_INET_NUMHOOKS, .nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE, .owner = THIS_MODULE,
.nops = 2, .nops = 1,
.hook_ops_init = nft_inet_hook_ops_init, .hooks = {
[NF_INET_LOCAL_IN] = nft_do_chain_inet,
[NF_INET_LOCAL_OUT] = nft_inet_output,
[NF_INET_FORWARD] = nft_do_chain_inet,
[NF_INET_PRE_ROUTING] = nft_do_chain_inet,
[NF_INET_POST_ROUTING] = nft_do_chain_inet,
},
}; };
static int __net_init nf_tables_inet_init_net(struct net *net) static int __net_init nf_tables_inet_init_net(struct net *net)