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Linux kernel mirror (for testing)
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linux
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the UDP module.
7 *
8 * Version: @(#)udp.h 1.0.2 05/07/93
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * Fixes:
14 * Alan Cox : Turned on udp checksums. I don't want to
15 * chase 'memory corruption' bugs that aren't!
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22#ifndef _UDP_H
23#define _UDP_H
24
25#include <linux/list.h>
26#include <net/inet_sock.h>
27#include <net/sock.h>
28#include <net/snmp.h>
29#include <linux/seq_file.h>
30
31#define UDP_HTABLE_SIZE 128
32
33/* udp.c: This needs to be shared by v4 and v6 because the lookup
34 * and hashing code needs to work with different AF's yet
35 * the port space is shared.
36 */
37extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];
38extern rwlock_t udp_hash_lock;
39
40extern int udp_port_rover;
41
42static inline int udp_lport_inuse(u16 num)
43{
44 struct sock *sk;
45 struct hlist_node *node;
46
47 sk_for_each(sk, node, &udp_hash[num & (UDP_HTABLE_SIZE - 1)])
48 if (inet_sk(sk)->num == num)
49 return 1;
50 return 0;
51}
52
53/* Note: this must match 'valbool' in sock_setsockopt */
54#define UDP_CSUM_NOXMIT 1
55
56/* Used by SunRPC/xprt layer. */
57#define UDP_CSUM_NORCV 2
58
59/* Default, as per the RFC, is to always do csums. */
60#define UDP_CSUM_DEFAULT 0
61
62extern struct proto udp_prot;
63
64struct sk_buff;
65
66extern void udp_err(struct sk_buff *, u32);
67
68extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
69 struct msghdr *msg, size_t len);
70
71extern int udp_rcv(struct sk_buff *skb);
72extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
73extern int udp_disconnect(struct sock *sk, int flags);
74extern unsigned int udp_poll(struct file *file, struct socket *sock,
75 poll_table *wait);
76
77DECLARE_SNMP_STAT(struct udp_mib, udp_statistics);
78#define UDP_INC_STATS(field) SNMP_INC_STATS(udp_statistics, field)
79#define UDP_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_statistics, field)
80#define UDP_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_statistics, field)
81
82/* /proc */
83struct udp_seq_afinfo {
84 struct module *owner;
85 char *name;
86 sa_family_t family;
87 int (*seq_show) (struct seq_file *m, void *v);
88 struct file_operations *seq_fops;
89};
90
91struct udp_iter_state {
92 sa_family_t family;
93 int bucket;
94 struct seq_operations seq_ops;
95};
96
97#ifdef CONFIG_PROC_FS
98extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
99extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
100
101extern int udp4_proc_init(void);
102extern void udp4_proc_exit(void);
103#endif
104#endif /* _UDP_H */