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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/* UDP socket options */
30#define UDP_CORK 1 /* Never send partially complete segments */
31#define UDP_ENCAP 100 /* Set the socket to accept encapsulated packets */
32
33/* UDP encapsulation types */
34#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
35#define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */
36#define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */
37
38#ifdef __KERNEL__
39#include <net/inet_sock.h>
40#include <linux/skbuff.h>
41
42static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
43{
44 return (struct udphdr *)skb_transport_header(skb);
45}
46
47#define UDP_HTABLE_SIZE 128
48
49struct udp_sock {
50 /* inet_sock has to be the first member */
51 struct inet_sock inet;
52 int pending; /* Any pending frames ? */
53 unsigned int corkflag; /* Cork is required */
54 __u16 encap_type; /* Is this an Encapsulation socket? */
55 /*
56 * Following member retains the information to create a UDP header
57 * when the socket is uncorked.
58 */
59 __u16 len; /* total length of pending frames */
60 /*
61 * Fields specific to UDP-Lite.
62 */
63 __u16 pcslen;
64 __u16 pcrlen;
65/* indicator bits used by pcflag: */
66#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
67#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
68#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
69 __u8 pcflag; /* marks socket as UDP-Lite if > 0 */
70 __u8 unused[3];
71 /*
72 * For encapsulation sockets.
73 */
74 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
75};
76
77static inline struct udp_sock *udp_sk(const struct sock *sk)
78{
79 return (struct udp_sock *)sk;
80}
81
82#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
83
84#endif
85
86#endif /* _LINUX_UDP_H */