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 */ 105