/* * 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 <linux/seq_file.h> #define UDP_HTABLE_SIZE		128 /* udp.c: This needs to be shared by v4 and v6 because the lookup *        and hashing code needs to work with different AF's yet *        the port space is shared. */extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];extern rwlock_t udp_hash_lock; extern int udp_port_rover; static inline int udp_lport_inuse(u16 num){	struct sock *sk;	struct hlist_node *node; 	sk_for_each(sk, node, &udp_hash[num & (UDP_HTABLE_SIZE - 1)])		if (inet_sk(sk)->num == num)			return 1;	return 0;} /* Note: this must match 'valbool' in sock_setsockopt */#define UDP_CSUM_NOXMIT		1 /* Used by SunRPC/xprt layer. */#define UDP_CSUM_NORCV		2 /* Default, as per the RFC, is to always do csums. */#define UDP_CSUM_DEFAULT	0 extern struct proto udp_prot; struct sk_buff; 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); DECLARE_SNMP_STAT(struct udp_mib, udp_statistics);#define UDP_INC_STATS(field)		SNMP_INC_STATS(udp_statistics, field)#define UDP_INC_STATS_BH(field)		SNMP_INC_STATS_BH(udp_statistics, field)#define UDP_INC_STATS_USER(field) 	SNMP_INC_STATS_USER(udp_statistics, field) /* /proc */struct udp_seq_afinfo {	struct module		*owner;	char			*name;	sa_family_t		family;	int 			(*seq_show) (struct seq_file *m, void *v);	struct file_operations	*seq_fops;}; struct udp_iter_state {	sa_family_t		family;	int			bucket;	struct seq_operations	seq_ops;}; #ifdef CONFIG_PROC_FSextern 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#endif	/* _UDP_H */