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 /* 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  */
  37 extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];
  38 extern rwlock_t udp_hash_lock;
  39
  40 extern int udp_port_rover;
  41
  42 static 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
  62 extern struct proto udp_prot;
  63
  64 struct sk_buff;
  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 #ifdef CONFIG_PROC_FS
  98 extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
  99 extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
 100
 101 extern int  udp4_proc_init(void);
 102 extern void udp4_proc_exit(void);
 103 #endif
 104 #endif  /* _UDP_H */