[net-next-2.6.git] / include / linux / udp.h

/*
 * 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;
};

/* 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 <net/inet_sock.h>
#include <linux/skbuff.h>
#include <net/netns/hash.h>

static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
{
	return (struct udphdr *)skb_transport_header(skb);
}

#define UDP_HTABLE_SIZE_MIN		(CONFIG_BASE_SMALL ? 128 : 256)

static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
{
	return (num + net_hash_mix(net)) & mask;
}

struct udp_sock {
	/* inet_sock has to be the first member */
	struct inet_sock inet;
#define udp_port_hash		inet.sk.__sk_common.skc_u16hashes[0]
#define udp_portaddr_hash	inet.sk.__sk_common.skc_u16hashes[1]
#define udp_portaddr_node	inet.sk.__sk_common.skc_portaddr_node
	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 udp_portaddr_for_each_entry(__sk, node, list) \
	hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)

#define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
	hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)

#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)

#endif

#endif	/* _LINUX_UDP_H */
Commit	Line	Data
1da177e4 LT	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
	22	struct udphdr {
4e7e0c75 AV	23	__be16 source;
	24	__be16 dest;
	25	__be16 len;
9981a0e3	26	__sum16 check;
1da177e4 LT	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 */
342f0234	36	#define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */
1da177e4 LT	37
1da177e4 LT	38	#ifdef __KERNEL__
14c85021	39	#include <net/inet_sock.h>
310afe86	40	#include <linux/skbuff.h>
0b441916	41	#include <net/netns/hash.h>
310afe86 JP	42
	43	static inline struct udphdr udp_hdr(const struct sk_buff skb)
	44	{
	45	return (struct udphdr *)skb_transport_header(skb);
	46	}
	47
f86dcc5a	48	#define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
1da177e4	49
f86dcc5a	50	static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
d6266281	51	{
f86dcc5a	52	return (num + net_hash_mix(net)) & mask;
d6266281 PE	53	}
d6266281 PE	54
1da177e4 LT	55	struct udp_sock {
	56	/* inet_sock has to be the first member */
	57	struct inet_sock inet;
d4cada4a ED	58	#define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0]
d4cada4a ED	59	#define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1]
512615b6	60	#define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node
1da177e4 LT	61	int pending; /* Any pending frames ? */
	62	unsigned int corkflag; /* Cork is required */
	63	__u16 encap_type; /* Is this an Encapsulation socket? */
	64	/*
47bdd718	65	* Following member retains the information to create a UDP header
1da177e4 LT	66	* when the socket is uncorked.
	67	*/
	68	__u16 len; /* total length of pending frames */
ba4e58ec GR	69	/*
	70	* Fields specific to UDP-Lite.
	71	*/
	72	__u16 pcslen;
	73	__u16 pcrlen;
	74	/* indicator bits used by pcflag: */
	75	#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
	76	#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
	77	#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
	78	__u8 pcflag; /* marks socket as UDP-Lite if > 0 */
342f0234 JC	79	__u8 unused[3];
	80	/*
	81	* For encapsulation sockets.
	82	*/
	83	int (encap_rcv)(struct sock sk, struct sk_buff *skb);
1da177e4 LT	84	};
	85
	86	static inline struct udp_sock udp_sk(const struct sock sk)
	87	{
	88	return (struct udp_sock *)sk;
	89	}
e898d4db	90
30fff923 ED	91	#define udp_portaddr_for_each_entry(__sk, node, list) \
	92	hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)
	93
	94	#define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
	95	hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)
	96
ba4e58ec	97	#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
1da177e4 LT	98
	99	#endif
	100
	101	#endif /* _LINUX_UDP_H */