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, <bir7@leland.Stanford.Edu>
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/udp.h>
26 #include <linux/ip.h>
27 #include <linux/list.h>
28 #include <net/sock.h>
29 #include <net/snmp.h>
30 #include <linux/seq_file.h>
31
32 #define UDP_HTABLE_SIZE 128
33
34 /* udp.c: This needs to be shared by v4 and v6 because the lookup
35 * and hashing code needs to work with different AF's yet
36 * the port space is shared.
37 */
38 extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];
39 extern rwlock_t udp_hash_lock;
40
41 extern int udp_port_rover;
42
43 static inline int udp_lport_inuse(u16 num)
44 {
45 struct sock *sk;
46 struct hlist_node *node;
47
48 sk_for_each(sk, node, &udp_hash[num & (UDP_HTABLE_SIZE - 1)])
49 if (inet_sk(sk)->num == num)
50 return 1;
51 return 0;
52 }
53
54 /* Note: this must match 'valbool' in sock_setsockopt */
55 #define UDP_CSUM_NOXMIT 1
56
57 /* Used by SunRPC/xprt layer. */
58 #define UDP_CSUM_NORCV 2
59
60 /* Default, as per the RFC, is to always do csums. */
61 #define UDP_CSUM_DEFAULT 0
62
63 extern struct proto udp_prot;
64
65
66 extern void udp_err(struct sk_buff *, u32);
67
68 extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
69 struct msghdr *msg, size_t len);
70
71 extern int udp_rcv(struct sk_buff *skb);
72 extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
73 extern int udp_disconnect(struct sock *sk, int flags);
74 extern unsigned int udp_poll(struct file *file, struct socket *sock,
75 poll_table *wait);
76
77 DECLARE_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 */
83 struct 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
91 struct udp_iter_state {
92 sa_family_t family;
93 int bucket;
94 struct seq_operations seq_ops;
95 };
96
97 extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
98 extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
99 #endif /* _UDP_H */
100
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