/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the UDP protocol. * * Version: @(#)udp.h 1.0.2 04/28/93 * * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _LINUX_UDP_H #define _LINUX_UDP_H #include <linux/types.h> struct udphdr { __be16 source; __be16 dest; __be16 len; __sum16 check; }; #ifdef __KERNEL__ #include <linux/skbuff.h> static inline struct udphdr *udp_hdr(const struct sk_buff *skb) { return (struct udphdr *)skb_transport_header(skb); } #endif /* UDP socket options */ #define UDP_CORK 1 /* Never send partially complete segments */ #define UDP_ENCAP 100 /* Set the socket to accept encapsulated packets */ /* UDP encapsulation types */ #define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */ #define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */ #define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */ #ifdef __KERNEL__ #include <linux/types.h> #include <net/inet_sock.h> #define UDP_HTABLE_SIZE 128 struct udp_sock { /* inet_sock has to be the first member */ struct inet_sock inet; int pending; /* Any pending frames ? */ unsigned int corkflag; /* Cork is required */ __u16 encap_type; /* Is this an Encapsulation socket? */ /* * Following member retains the information to create a UDP header * when the socket is uncorked. */ __u16 len; /* total length of pending frames */ /* * Fields specific to UDP-Lite. */ __u16 pcslen; __u16 pcrlen; /* indicator bits used by pcflag: */ #define UDPLITE_BIT 0x1 /* set by udplite proto init function */ #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */ #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */ __u8 pcflag; /* marks socket as UDP-Lite if > 0 */ __u8 unused[3]; /* * For encapsulation sockets. */ int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); }; static inline struct udp_sock *udp_sk(const struct sock *sk) { return (struct udp_sock *)sk; } #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag) #endif #endif /* _LINUX_UDP_H */