ndisc: Unexport ndisc_{build,send}_skb().

These symbols were exported for bonding device by commit 305d552a
("bonding: send IPv6 neighbor advertisement on failover").

It bacame obsolete by commit 7c899432 ("bonding, ipv4, ipv6, vlan: Handle
NETDEV_BONDING_FAILOVER like NETDEV_NOTIFY_PEERS") and removed by
commit 4f5762ec ("bonding: Remove obsolete source file 'bond_ipv6.c'").
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ndisc.h

@@ -190,21 +190,6 @@ extern void			ndisc_send_redirect(struct sk_buff *skb,
 extern int			ndisc_mc_map(const struct in6_addr *addr, char *buf,
 					     struct net_device *dev, int dir);
 
-extern struct sk_buff		*ndisc_build_skb(struct net_device *dev,
-						 const struct in6_addr *daddr,
-						 const struct in6_addr *saddr,
-						 struct icmp6hdr *icmp6h,
-						 const struct in6_addr *target,
-						 int llinfo);
-
-extern void			ndisc_send_skb(struct sk_buff *skb,
-					       struct net_device *dev,
-					       struct neighbour *neigh,
-					       const struct in6_addr *daddr,
-					       const struct in6_addr *saddr,
-					       struct icmp6hdr *icmp6h);
-
-
 
 /*
  *	IGMP

net/ipv6/ndisc.c

@@ -370,7 +370,7 @@ static void pndisc_destructor(struct pneigh_entry *n)
 	ipv6_dev_mc_dec(dev, &maddr);
 }
 
-struct sk_buff *ndisc_build_skb(struct net_device *dev,
+static struct sk_buff *ndisc_build_skb(struct net_device *dev,
 				       const struct in6_addr *daddr,
 				       const struct in6_addr *saddr,
 				       struct icmp6hdr *icmp6h,
@@ -431,10 +431,7 @@ struct sk_buff *ndisc_build_skb(struct net_device *dev,
 	return skb;
 }
 
-EXPORT_SYMBOL(ndisc_build_skb);
-
-void ndisc_send_skb(struct sk_buff *skb,
-		    struct net_device *dev,
+static void ndisc_send_skb(struct sk_buff *skb, struct net_device *dev,
 			   struct neighbour *neigh,
 			   const struct in6_addr *daddr,
 			   const struct in6_addr *saddr,
@@ -473,8 +470,6 @@ void ndisc_send_skb(struct sk_buff *skb,
 	rcu_read_unlock();
 }
 
-EXPORT_SYMBOL(ndisc_send_skb);
-
 /*
  *	Send a Neighbour Discover packet
  */