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 protocol. 7 * 8 * Version: @(#)udp.h 1.0.2 04/28/93 9 * 10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17#ifndef _LINUX_UDP_H 18#define _LINUX_UDP_H 19 20#include <linux/types.h> 21 22struct udphdr { 23 __be16 source; 24 __be16 dest; 25 __be16 len; 26 __sum16 check; 27}; 28 29#ifdef __KERNEL__ 30#include <linux/skbuff.h> 31 32static inline struct udphdr *udp_hdr(const struct sk_buff *skb) 33{ 34 return (struct udphdr *)skb_transport_header(skb); 35} 36#endif 37 38/* UDP socket options */ 39#define UDP_CORK 1 /* Never send partially complete segments */ 40#define UDP_ENCAP 100 /* Set the socket to accept encapsulated packets */ 41 42/* UDP encapsulation types */ 43#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */ 44#define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */ 45 46#ifdef __KERNEL__ 47#include <linux/types.h> 48 49#include <net/inet_sock.h> 50#define UDP_HTABLE_SIZE 128 51 52struct udp_sock { 53 /* inet_sock has to be the first member */ 54 struct inet_sock inet; 55 int pending; /* Any pending frames ? */ 56 unsigned int corkflag; /* Cork is required */ 57 __u16 encap_type; /* Is this an Encapsulation socket? */ 58 /* 59 * Following member retains the information to create a UDP header 60 * when the socket is uncorked. 61 */ 62 __u16 len; /* total length of pending frames */ 63 /* 64 * Fields specific to UDP-Lite. 65 */ 66 __u16 pcslen; 67 __u16 pcrlen; 68/* indicator bits used by pcflag: */ 69#define UDPLITE_BIT 0x1 /* set by udplite proto init function */ 70#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */ 71#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */ 72 __u8 pcflag; /* marks socket as UDP-Lite if > 0 */ 73}; 74 75static inline struct udp_sock *udp_sk(const struct sock *sk) 76{ 77 return (struct udp_sock *)sk; 78} 79#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag) 80 81#endif 82 83#endif /* _LINUX_UDP_H */ 84