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* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
* Definitions for the UDP module.
* Version: @(#)udp.h 1.0.2 05/07/93
* Authors: Ross Biro
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Fixes:
* Alan Cox : Turned on udp checksums. I don't want to
* chase 'memory corruption' bugs that aren't!
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
#ifndef _UDP_H
#define _UDP_H
#include <linux/list.h>
#include <net/inet_sock.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/ip.h>
#include <linux/ipv6.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
* struct udp_skb_cb - UDP(-Lite) private variables
* @header: private variables used by IPv4/IPv6
* @cscov: checksum coverage length (UDP-Lite only)
* @partial_cov: if set indicates partial csum coverage
struct udp_skb_cb {
union {
struct inet_skb_parm h4;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
struct inet6_skb_parm h6;
} header;
__u16 cscov;
__u8 partial_cov;
#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];
extern rwlock_t udp_hash_lock;
/* Note: this must match 'valbool' in sock_setsockopt */
/* Used by SunRPC/xprt layer. */
#define UDP_CSUM_NORCV 2
/* Default, as per the RFC, is to always do csums. */
extern struct proto udp_prot;
struct sk_buff;
* Generic checksumming routines for UDP(-Lite) v4 and v6
static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov);
static inline int udp_lib_checksum_complete(struct sk_buff *skb)
return !skb_csum_unnecessary(skb) &&
* udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
* @sk: socket we are writing to
* @skb: sk_buff containing the filled-in UDP header
* (checksum field must be zeroed out)
static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
__wsum csum = csum_partial(skb_transport_header(skb),
sizeof(struct udphdr), 0);
skb_queue_walk(&sk->sk_write_queue, skb) {
csum = csum_add(csum, skb->csum);
return csum;
/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
static inline void udp_lib_hash(struct sock *sk)
static inline void udp_lib_unhash(struct sock *sk)
if (sk_del_node_init(sk)) {
inet_sk(sk)->num = 0;
static inline void udp_lib_close(struct sock *sk, long timeout)
/* net/ipv4/udp.c */
extern int udp_get_port(struct sock *sk, unsigned short snum,
int (*saddr_cmp)(const struct sock *, const struct sock *));
extern void udp_err(struct sk_buff *, u32);
extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len);
extern int udp_rcv(struct sk_buff *skb);
extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
extern int udp_disconnect(struct sock *sk, int flags);
extern unsigned int udp_poll(struct file *file, struct socket *sock,
poll_table *wait);
extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen);
extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen,
int (*push_pending_frames)(struct sock *));
DECLARE_SNMP_STAT(struct udp_mib, udp_statistics);
* SNMP statistics for UDP and UDP-Lite
#define UDP_INC_STATS_USER(field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \
else SNMP_INC_STATS_USER(udp_statistics, field); } while(0)
#define UDP_INC_STATS_BH(field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \
else SNMP_INC_STATS_BH(udp_statistics, field); } while(0)
/* /proc */
struct udp_seq_afinfo {
struct module *owner;
char *name;
sa_family_t family;
struct hlist_head *hashtable;
int (*seq_show) (struct seq_file *m, void *v);
struct file_operations *seq_fops;
struct udp_iter_state {
sa_family_t family;
struct hlist_head *hashtable;
int bucket;
struct seq_operations seq_ops;
extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
extern int udp4_proc_init(void);
extern void udp4_proc_exit(void);
#endif /* _UDP_H */