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
49 static inline int udp_hashfn(const unsigned num
)
51 return num
& (UDP_HTABLE_SIZE
- 1);
55 /* inet_sock has to be the first member */
56 struct inet_sock inet
;
57 int pending
; /* Any pending frames ? */
58 unsigned int corkflag
; /* Cork is required */
59 __u16 encap_type
; /* Is this an Encapsulation socket? */
61 * Following member retains the information to create a UDP header
62 * when the socket is uncorked.
64 __u16 len
; /* total length of pending frames */
66 * Fields specific to UDP-Lite.
70 /* indicator bits used by pcflag: */
71 #define UDPLITE_BIT 0x1 /* set by udplite proto init function */
72 #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
73 #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
74 __u8 pcflag
; /* marks socket as UDP-Lite if > 0 */
77 * For encapsulation sockets.
79 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
82 static inline struct udp_sock
*udp_sk(const struct sock
*sk
)
84 return (struct udp_sock
*)sk
;
87 #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
91 #endif /* _LINUX_UDP_H */
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