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, <[email protected]> 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 22 struct udphdr { 23 __be16 source; 24 __be16 dest; 25 __be16 len; 26 __sum16 check; 27 }; 28 29 #ifdef __KERNEL__ 30 #include <linux/skbuff.h> 31 32 static 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 #define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */ 46 47 #ifdef __KERNEL__ 48 #include <linux/types.h> 49 50 #include <net/inet_sock.h> 51 #define UDP_HTABLE_SIZE 128 52 53 struct udp_sock { 54 /* inet_sock has to be the first member */ 55 struct inet_sock inet; 56 int pending; /* Any pending frames ? */ 57 unsigned int corkflag; /* Cork is required */ 58 __u16 encap_type; /* Is this an Encapsulation socket? */ 59 /* 60 * Following member retains the information to create a UDP header 61 * when the socket is uncorked. 62 */ 63 __u16 len; /* total length of pending frames */ 64 /* 65 * Fields specific to UDP-Lite. 66 */ 67 __u16 pcslen; 68 __u16 pcrlen; 69 /* indicator bits used by pcflag: */ 70 #define UDPLITE_BIT 0x1 /* set by udplite proto init function */ 71 #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */ 72 #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */ 73 __u8 pcflag; /* marks socket as UDP-Lite if > 0 */ 74 __u8 unused[3]; 75 /* 76 * For encapsulation sockets. 77 */ 78 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 79 }; 80 81 static inline struct udp_sock *udp_sk(const struct sock *sk) 82 { 83 return (struct udp_sock *)sk; 84 } 85 #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag) 86 87 #endif 88 89 #endif /* _LINUX_UDP_H */ 90