1. 根目录:
2. net
3. ipv6
4. udp_impl.h

#ifndef _UDP6_IMPL_H
#define _UDP6_IMPL_H
#include <net/udp.h>
#include <net/udplite.h>
#include <net/protocol.h>
#include <net/addrconf.h>
#include <net/inet_common.h>
#include <net/transp_v6.h>

int __udp6_lib_rcv(struct sk_buff *, struct udp_table *, int);
void __udp6_lib_err(struct sk_buff *, struct inet6_skb_parm *, u8, u8, int,
		    __be32, struct udp_table *);

int udp_v6_get_port(struct sock *sk, unsigned short snum);

int udpv6_getsockopt(struct sock *sk, int level, int optname,
		     char __user *optval, int __user *optlen);
int udpv6_setsockopt(struct sock *sk, int level, int optname,
		     char __user *optval, unsigned int optlen);
#ifdef CONFIG_COMPAT
int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
			    char __user *optval, unsigned int optlen);
int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
			    char __user *optval, int __user *optlen);
#endif
int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		  size_t len);
int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		  size_t len, int noblock, int flags, int *addr_len);
int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
void udpv6_destroy_sock(struct sock *sk);

void udp_v6_clear_sk(struct sock *sk, int size);

#ifdef CONFIG_PROC_FS
int udp6_seq_show(struct seq_file *seq, void *v);
#endif
#endif	/* _UDP6_IMPL_H */