[NETFILTER]: Add address family specific checksum helpers

[net-next-2.6.git] / include / linux / netfilter.h

diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 6ee168c4978a3782410767036d8451ef018b2bd8..b31a9bca9361307a6ce997c029634a58e2cd4939 100644 (file)
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -285,6 +285,8 @@ extern int skb_make_writable(struct sk_buff **pskb, unsigned int writable_len);
 
 struct nf_afinfo {
        unsigned short  family;
+       unsigned int    (*checksum)(struct sk_buff *skb, unsigned int hook,
+                                   unsigned int dataoff, u_int8_t protocol);
        void            (*saveroute)(const struct sk_buff *skb,
                                     struct nf_info *info);
        int             (*reroute)(struct sk_buff **skb,
@@ -298,6 +300,21 @@ static inline struct nf_afinfo *nf_get_afinfo(unsigned short family)
        return rcu_dereference(nf_afinfo[family]);
 }
 
+static inline unsigned int
+nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
+           u_int8_t protocol, unsigned short family)
+{
+       struct nf_afinfo *afinfo;
+       unsigned int csum = 0;
+
+       rcu_read_lock();
+       afinfo = nf_get_afinfo(family);
+       if (afinfo)
+               csum = afinfo->checksum(skb, hook, dataoff, protocol);
+       rcu_read_unlock();
+       return csum;
+}
+
 extern int nf_register_afinfo(struct nf_afinfo *afinfo);
 extern void nf_unregister_afinfo(struct nf_afinfo *afinfo);