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.
6 * Definitions for the UDP protocol.
8 * Version: @(#)udp.h 1.0.2 04/28/93
10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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.
20 #include <linux/types.h>
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 */
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 */
39 #include <net/inet_sock.h>
40 #include <linux/skbuff.h>
42 static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
44 return (struct udphdr *)skb_transport_header(skb);
47 #define UDP_HTABLE_SIZE 128
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? */
56 * Following member retains the information to create a UDP header
57 * when the socket is uncorked.
59 __u16 len; /* total length of pending frames */
61 * Fields specific to UDP-Lite.
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 */
72 * For encapsulation sockets.
74 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
77 static inline struct udp_sock *udp_sk(const struct sock *sk)
79 return (struct udp_sock *)sk;
82 #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
86 #endif /* _LINUX_UDP_H */