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