include/net/udp.h

   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 extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];
  34 extern rwlock_t udp_hash_lock;
  35
  36
  37 /* Note: this must match 'valbool' in sock_setsockopt */
  38 #define UDP_CSUM_NOXMIT         1
  39
  40 /* Used by SunRPC/xprt layer. */
  41 #define UDP_CSUM_NORCV          2
  42
  43 /* Default, as per the RFC, is to always do csums. */
  44 #define UDP_CSUM_DEFAULT        0
  45
  46 extern struct proto udp_prot;
  47
  48 struct sk_buff;
  49
  50 extern int      udp_get_port(struct sock *sk, unsigned short snum,
  51                              int (*saddr_cmp)(const struct sock *, const struct sock *));
  52 extern void     udp_err(struct sk_buff *, u32);
  53
  54 extern int      udp_sendmsg(struct kiocb *iocb, struct sock *sk,
  55                             struct msghdr *msg, size_t len);
  56
  57 extern int      udp_rcv(struct sk_buff *skb);
  58 extern int      udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
  59 extern int      udp_disconnect(struct sock *sk, int flags);
  60 extern unsigned int udp_poll(struct file *file, struct socket *sock,
  61                              poll_table *wait);
  62
  63 DECLARE_SNMP_STAT(struct udp_mib, udp_statistics);
  64 #define UDP_INC_STATS(field)            SNMP_INC_STATS(udp_statistics, field)
  65 #define UDP_INC_STATS_BH(field)         SNMP_INC_STATS_BH(udp_statistics, field)
  66 #define UDP_INC_STATS_USER(field)       SNMP_INC_STATS_USER(udp_statistics, field)
  67
  68 /* /proc */
  69 struct udp_seq_afinfo {
  70         struct module           *owner;
  71         char                    *name;
  72         sa_family_t             family;
  73         int                     (*seq_show) (struct seq_file *m, void *v);
  74         struct file_operations  *seq_fops;
  75 };
  76
  77 struct udp_iter_state {
  78         sa_family_t             family;
  79         int                     bucket;
  80         struct seq_operations   seq_ops;
  81 };
  82
  83 #ifdef CONFIG_PROC_FS
  84 extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
  85 extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
  86
  87 extern int  udp4_proc_init(void);
  88 extern void udp4_proc_exit(void);
  89 #endif
  90 #endif  /* _UDP_H */