| /* |
| * 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 */ |