netfilter: move reroute indirection to struct nf_ipv6_ops
We cannot make a direct call to nf_ip6_reroute() because that would result
in autoloading the 'ipv6' module because of symbol dependencies.
Therefore, define reroute indirection in nf_ipv6_ops where this really
belongs to.
For IPv4, we can indeed make a direct function call, which is faster,
given IPv4 is built-in in the networking code by default. Still,
CONFIG_INET=n and CONFIG_NETFILTER=y is possible, so define empty inline
stub for IPv4 in such case.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/net/netfilter/utils.c b/net/netfilter/utils.c
index 45c2241..0b660c5 100644
--- a/net/netfilter/utils.c
+++ b/net/netfilter/utils.c
@@ -2,6 +2,7 @@
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
+#include <net/netfilter/nf_queue.h>
__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol,
@@ -69,3 +70,21 @@ int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
return ret;
}
EXPORT_SYMBOL_GPL(nf_route);
+
+int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry)
+{
+ const struct nf_ipv6_ops *v6ops;
+ int ret = 0;
+
+ switch (entry->state.pf) {
+ case AF_INET:
+ ret = nf_ip_reroute(skb, entry);
+ break;
+ case AF_INET6:
+ v6ops = rcu_dereference(nf_ipv6_ops);
+ if (v6ops)
+ ret = v6ops->reroute(skb, entry);
+ break;
+ }
+ return ret;
+}
