extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
u32 info, u8 *payload);
extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
u32 info, u8 *payload);