OpenWrt – Rev 1
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From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Sat, 9 Dec 2017 15:36:24 +0100
Subject: [PATCH] netfilter: nf_tables_inet: don't use multihook infrastructure
anymore
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>
---
--- a/include/net/netfilter/nf_tables_ipv4.h
+++ b/include/net/netfilter/nf_tables_ipv4.h
@@ -53,6 +53,4 @@ static inline void nft_set_pktinfo_ipv4_
nft_set_pktinfo_unspec(pkt, skb);
}
-extern struct nft_af_info nft_af_ipv4;
-
#endif
--- a/include/net/netfilter/nf_tables_ipv6.h
+++ b/include/net/netfilter/nf_tables_ipv6.h
@@ -69,6 +69,4 @@ static inline void nft_set_pktinfo_ipv6_
nft_set_pktinfo_unspec(pkt, skb);
}
-extern struct nft_af_info nft_af_ipv6;
-
#endif
--- a/net/ipv4/netfilter/nf_tables_ipv4.c
+++ b/net/ipv4/netfilter/nf_tables_ipv4.c
@@ -45,7 +45,7 @@ static unsigned int nft_ipv4_output(void
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,
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
@@ -58,7 +58,6 @@ struct nft_af_info nft_af_ipv4 __read_mo
[NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
},
};
-EXPORT_SYMBOL_GPL(nft_af_ipv4);
static int nf_tables_ipv4_init_net(struct net *net)
{
--- a/net/ipv6/netfilter/nf_tables_ipv6.c
+++ b/net/ipv6/netfilter/nf_tables_ipv6.c
@@ -42,7 +42,7 @@ static unsigned int nft_ipv6_output(void
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,
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
@@ -55,7 +55,6 @@ struct nft_af_info nft_af_ipv6 __read_mo
[NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
},
};
-EXPORT_SYMBOL_GPL(nft_af_ipv6);
static int nf_tables_ipv6_init_net(struct net *net)
{
--- a/net/netfilter/nf_tables_inet.c
+++ b/net/netfilter/nf_tables_inet.c
@@ -9,6 +9,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/ip.h>
+#include <linux/ipv6.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <net/netfilter/nf_tables.h>
@@ -16,26 +17,71 @@
#include <net/netfilter/nf_tables_ipv6.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)
- afi = &nft_af_ipv4;
- else
- afi = &nft_af_ipv6;
-
- ops->pf = afi->family;
- if (afi->hooks[ops->hooknum])
- ops->hook = afi->hooks[ops->hooknum];
+ nft_set_pktinfo(&pkt, skb, state);
+
+ switch (state->pf) {
+ case NFPROTO_IPV4:
+ 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 = {
.family = NFPROTO_INET,
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
- .nops = 2,
- .hook_ops_init = nft_inet_hook_ops_init,
+ .nops = 1,
+ .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)