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>
30 #include <linux/skbuff.h>
32 static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
34 return (struct udphdr *)skb_transport_header(skb);
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 */
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 */
48 #include <linux/types.h>
50 #include <net/inet_sock.h>
51 #define UDP_HTABLE_SIZE 128
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? */
60 * Following member retains the information to create a UDP header
61 * when the socket is uncorked.
63 __u16 len; /* total length of pending frames */
65 * Fields specific to UDP-Lite.
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 */
76 * For encapsulation sockets.
78 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
81 static inline struct udp_sock *udp_sk(const struct sock *sk)
83 return (struct udp_sock *)sk;
85 #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
89 #endif /* _LINUX_UDP_H */