i386/linux/linux-2.3.21/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, <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 <net/sock.h>
  27
  28 #define UDP_HTABLE_SIZE         128
  29
  30 /* udp.c: This needs to be shared by v4 and v6 because the lookup
  31  *        and hashing code needs to work with different AF's yet
  32  *        the port space is shared.
  33  */
  34 extern struct sock *udp_hash[UDP_HTABLE_SIZE];
  35 extern rwlock_t udp_hash_lock;
  36
  37 extern int udp_port_rover;
  38
  39 static inline int udp_lport_inuse(u16 num)
  40 {
  41         struct sock *sk = udp_hash[num & (UDP_HTABLE_SIZE - 1)];
  42
  43         for(; sk != NULL; sk = sk->next) {
  44                 if(sk->num == num)
  45                         return 1;
  46         }
  47         return 0;
  48 }
  49
  50 /* Note: this must match 'valbool' in sock_setsockopt */
  51 #define UDP_CSUM_NOXMIT         1
  52
  53 /* Used by SunRPC/xprt layer. */
  54 #define UDP_CSUM_NORCV          2
  55
  56 /* Default, as per the RFC, is to always do csums. */
  57 #define UDP_CSUM_DEFAULT        0
  58
  59 extern struct proto udp_prot;
  60
  61
  62 extern void     udp_err(struct sk_buff *, unsigned char *, int);
  63 extern int      udp_connect(struct sock *sk,
  64                             struct sockaddr *usin, int addr_len);
  65
  66 extern int      udp_sendmsg(struct sock *sk, struct msghdr *msg, int len);
  67
  68 extern int      udp_rcv(struct sk_buff *skb, unsigned short len);
  69 extern int      udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
  70 extern int      udp_disconnect(struct sock *sk, int flags);
  71
  72 #endif  /* _UDP_H */