[net-next-2.6.git] / include / linux / ip.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 IP protocol.
 *
 * Version:	@(#)ip.h	1.0.2	04/28/93
 *
 * Authors:	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_IP_H
#define _LINUX_IP_H
#include <asm/byteorder.h>

#define IPTOS_TOS_MASK		0x1E
#define IPTOS_TOS(tos)		((tos)&IPTOS_TOS_MASK)
#define	IPTOS_LOWDELAY		0x10
#define	IPTOS_THROUGHPUT	0x08
#define	IPTOS_RELIABILITY	0x04
#define	IPTOS_MINCOST		0x02

#define IPTOS_PREC_MASK		0xE0
#define IPTOS_PREC(tos)		((tos)&IPTOS_PREC_MASK)
#define IPTOS_PREC_NETCONTROL           0xe0
#define IPTOS_PREC_INTERNETCONTROL      0xc0
#define IPTOS_PREC_CRITIC_ECP           0xa0
#define IPTOS_PREC_FLASHOVERRIDE        0x80
#define IPTOS_PREC_FLASH                0x60
#define IPTOS_PREC_IMMEDIATE            0x40
#define IPTOS_PREC_PRIORITY             0x20
#define IPTOS_PREC_ROUTINE              0x00


/* IP options */
#define IPOPT_COPY		0x80
#define IPOPT_CLASS_MASK	0x60
#define IPOPT_NUMBER_MASK	0x1f

#define	IPOPT_COPIED(o)		((o)&IPOPT_COPY)
#define	IPOPT_CLASS(o)		((o)&IPOPT_CLASS_MASK)
#define	IPOPT_NUMBER(o)		((o)&IPOPT_NUMBER_MASK)

#define	IPOPT_CONTROL		0x00
#define	IPOPT_RESERVED1		0x20
#define	IPOPT_MEASUREMENT	0x40
#define	IPOPT_RESERVED2		0x60

#define IPOPT_END	(0 |IPOPT_CONTROL)
#define IPOPT_NOOP	(1 |IPOPT_CONTROL)
#define IPOPT_SEC	(2 |IPOPT_CONTROL|IPOPT_COPY)
#define IPOPT_LSRR	(3 |IPOPT_CONTROL|IPOPT_COPY)
#define IPOPT_TIMESTAMP	(4 |IPOPT_MEASUREMENT)
#define IPOPT_RR	(7 |IPOPT_CONTROL)
#define IPOPT_SID	(8 |IPOPT_CONTROL|IPOPT_COPY)
#define IPOPT_SSRR	(9 |IPOPT_CONTROL|IPOPT_COPY)
#define IPOPT_RA	(20|IPOPT_CONTROL|IPOPT_COPY)

#define IPVERSION	4
#define MAXTTL		255
#define IPDEFTTL	64

#define IPOPT_OPTVAL 0
#define IPOPT_OLEN   1
#define IPOPT_OFFSET 2
#define IPOPT_MINOFF 4
#define MAX_IPOPTLEN 40
#define IPOPT_NOP IPOPT_NOOP
#define IPOPT_EOL IPOPT_END
#define IPOPT_TS  IPOPT_TIMESTAMP

#define	IPOPT_TS_TSONLY		0		/* timestamps only */
#define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
#define	IPOPT_TS_PRESPEC	3		/* specified modules only */

#ifdef __KERNEL__
#include <linux/config.h>
#include <linux/types.h>
#include <net/request_sock.h>
#include <net/sock.h>
#include <linux/igmp.h>
#include <net/flow.h>

struct ip_options {
  __u32		faddr;				/* Saved first hop address */
  unsigned char	optlen;
  unsigned char srr;
  unsigned char rr;
  unsigned char ts;
  unsigned char is_setbyuser:1,			/* Set by setsockopt?			*/
                is_data:1,			/* Options in __data, rather than skb	*/
                is_strictroute:1,		/* Strict source route			*/
                srr_is_hit:1,			/* Packet destination addr was our one	*/
                is_changed:1,			/* IP checksum more not valid		*/	
                rr_needaddr:1,			/* Need to record addr of outgoing dev	*/
                ts_needtime:1,			/* Need to record timestamp		*/
                ts_needaddr:1;			/* Need to record addr of outgoing dev  */
  unsigned char router_alert;
  unsigned char __pad1;
  unsigned char __pad2;
  unsigned char __data[0];
};

#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)

struct inet_request_sock {
	struct request_sock	req;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	u16			inet6_rsk_offset;
	/* 2 bytes hole, try to pack */
#endif
	u32			loc_addr;
	u32			rmt_addr;
	u16			rmt_port;
	u16			snd_wscale : 4, 
				rcv_wscale : 4, 
				tstamp_ok  : 1,
				sack_ok	   : 1,
				wscale_ok  : 1,
				ecn_ok	   : 1,
				acked	   : 1;
	struct ip_options	*opt;
};

static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
{
	return (struct inet_request_sock *)sk;
}

struct ipv6_pinfo;

struct inet_sock {
	/* sk and pinet6 has to be the first two members of inet_sock */
	struct sock		sk;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	struct ipv6_pinfo	*pinet6;
#endif
	/* Socket demultiplex comparisons on incoming packets. */
	__u32			daddr;		/* Foreign IPv4 addr */
	__u32			rcv_saddr;	/* Bound local IPv4 addr */
	__u16			dport;		/* Destination port */
	__u16			num;		/* Local port */
	__u32			saddr;		/* Sending source */
	__s16			uc_ttl;		/* Unicast TTL */
	__u16			cmsg_flags;
	struct ip_options	*opt;
	__u16			sport;		/* Source port */
	__u16			id;		/* ID counter for DF pkts */
	__u8			tos;		/* TOS */
	__u8			mc_ttl;		/* Multicasting TTL */
	__u8			pmtudisc;
	unsigned		recverr : 1,
				is_icsk : 1,	/* inet_connection_sock? */
				freebind : 1,
				hdrincl : 1,
				mc_loop : 1;
	int			mc_index;	/* Multicast device index */
	__u32			mc_addr;
	struct ip_mc_socklist	*mc_list;	/* Group array */
	/*
	 * Following members are used to retain the infomation to build
	 * an ip header on each ip fragmentation while the socket is corked.
	 */
	struct {
		unsigned int		flags;
		unsigned int		fragsize;
		struct ip_options	*opt;
		struct rtable		*rt;
		int			length; /* Total length of all frames */
		u32			addr;
		struct flowi		fl;
	} cork;
};

#define IPCORK_OPT	1	/* ip-options has been held in ipcork.opt */
#define IPCORK_ALLFRAG	2	/* always fragment (for ipv6 for now) */

static inline struct inet_sock *inet_sk(const struct sock *sk)
{
	return (struct inet_sock *)sk;
}

static inline void __inet_sk_copy_descendant(struct sock *sk_to,
					     const struct sock *sk_from,
					     const int ancestor_size)
{
	memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
	       sk_from->sk_prot->obj_size - ancestor_size);
}
#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
static inline void inet_sk_copy_descendant(struct sock *sk_to,
					   const struct sock *sk_from)
{
	__inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
}
#endif
#endif

extern int inet_sk_rebuild_header(struct sock *sk);

struct iphdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u8	ihl:4,
		version:4;
#elif defined (__BIG_ENDIAN_BITFIELD)
	__u8	version:4,
  		ihl:4;
#else
#error	"Please fix <asm/byteorder.h>"
#endif
	__u8	tos;
	__u16	tot_len;
	__u16	id;
	__u16	frag_off;
	__u8	ttl;
	__u8	protocol;
	__u16	check;
	__u32	saddr;
	__u32	daddr;
	/*The options start here. */
};

struct ip_auth_hdr {
	__u8  nexthdr;
	__u8  hdrlen;		/* This one is measured in 32 bit units! */
	__u16 reserved;
	__u32 spi;
	__u32 seq_no;		/* Sequence number */
	__u8  auth_data[0];	/* Variable len but >=4. Mind the 64 bit alignment! */
};

struct ip_esp_hdr {
	__u32 spi;
	__u32 seq_no;		/* Sequence number */
	__u8  enc_data[0];	/* Variable len but >=8. Mind the 64 bit alignment! */
};

struct ip_comp_hdr {
	__u8 nexthdr;
	__u8 flags;
	__u16 cpi;
};

#endif	/* _LINUX_IP_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 IP protocol.
	7	*
	8	* Version: @(#)ip.h 1.0.2 04/28/93
	9	*
	10	* Authors: 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_IP_H
	18	#define _LINUX_IP_H
	19	#include <asm/byteorder.h>
	20
	21	#define IPTOS_TOS_MASK 0x1E
	22	#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
	23	#define IPTOS_LOWDELAY 0x10
	24	#define IPTOS_THROUGHPUT 0x08
	25	#define IPTOS_RELIABILITY 0x04
	26	#define IPTOS_MINCOST 0x02
	27
	28	#define IPTOS_PREC_MASK 0xE0
	29	#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
	30	#define IPTOS_PREC_NETCONTROL 0xe0
	31	#define IPTOS_PREC_INTERNETCONTROL 0xc0
	32	#define IPTOS_PREC_CRITIC_ECP 0xa0
	33	#define IPTOS_PREC_FLASHOVERRIDE 0x80
	34	#define IPTOS_PREC_FLASH 0x60
	35	#define IPTOS_PREC_IMMEDIATE 0x40
	36	#define IPTOS_PREC_PRIORITY 0x20
	37	#define IPTOS_PREC_ROUTINE 0x00
	38
	39
	40	/* IP options */
	41	#define IPOPT_COPY 0x80
	42	#define IPOPT_CLASS_MASK 0x60
	43	#define IPOPT_NUMBER_MASK 0x1f
	44
	45	#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
	46	#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
	47	#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
	48
	49	#define IPOPT_CONTROL 0x00
	50	#define IPOPT_RESERVED1 0x20
	51	#define IPOPT_MEASUREMENT 0x40
	52	#define IPOPT_RESERVED2 0x60
	53
	54	#define IPOPT_END (0 \|IPOPT_CONTROL)
	55	#define IPOPT_NOOP (1 \|IPOPT_CONTROL)
	56	#define IPOPT_SEC (2 \|IPOPT_CONTROL\|IPOPT_COPY)
	57	#define IPOPT_LSRR (3 \|IPOPT_CONTROL\|IPOPT_COPY)
	58	#define IPOPT_TIMESTAMP (4 \|IPOPT_MEASUREMENT)
	59	#define IPOPT_RR (7 \|IPOPT_CONTROL)
	60	#define IPOPT_SID (8 \|IPOPT_CONTROL\|IPOPT_COPY)
	61	#define IPOPT_SSRR (9 \|IPOPT_CONTROL\|IPOPT_COPY)
	62	#define IPOPT_RA (20\|IPOPT_CONTROL\|IPOPT_COPY)
	63
	64	#define IPVERSION 4
65	#define MAXTTL 255
66	#define IPDEFTTL 64
67
68	#define IPOPT_OPTVAL 0
69	#define IPOPT_OLEN 1
70	#define IPOPT_OFFSET 2
71	#define IPOPT_MINOFF 4
72	#define MAX_IPOPTLEN 40
73	#define IPOPT_NOP IPOPT_NOOP
74	#define IPOPT_EOL IPOPT_END
75	#define IPOPT_TS IPOPT_TIMESTAMP
76
77	#define IPOPT_TS_TSONLY 0 /* timestamps only */
78	#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
79	#define IPOPT_TS_PRESPEC 3 /* specified modules only */
80
81	#ifdef __KERNEL__
82	#include <linux/config.h>
83	#include <linux/types.h>
2e6599cb	84	#include <net/request_sock.h>
1da177e4 LT	85	#include <net/sock.h>
	86	#include <linux/igmp.h>
	87	#include <net/flow.h>
	88
	89	struct ip_options {
	90	__u32 faddr; /* Saved first hop address */
	91	unsigned char optlen;
	92	unsigned char srr;
	93	unsigned char rr;
	94	unsigned char ts;
	95	unsigned char is_setbyuser:1, /* Set by setsockopt? */
	96	is_data:1, /* Options in __data, rather than skb */
	97	is_strictroute:1, /* Strict source route */
	98	srr_is_hit:1, /* Packet destination addr was our one */
	99	is_changed:1, /* IP checksum more not valid */
	100	rr_needaddr:1, /* Need to record addr of outgoing dev */
	101	ts_needtime:1, /* Need to record timestamp */
	102	ts_needaddr:1; /* Need to record addr of outgoing dev */
	103	unsigned char router_alert;
	104	unsigned char __pad1;
	105	unsigned char __pad2;
	106	unsigned char __data[0];
	107	};
	108
	109	#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
	110
2e6599cb	111	struct inet_request_sock {
60236fdd	112	struct request_sock req;
ca304b61 ACM	113	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	114	u16 inet6_rsk_offset;
	115	/* 2 bytes hole, try to pack */
	116	#endif
2e6599cb ACM	117	u32 loc_addr;
	118	u32 rmt_addr;
	119	u16 rmt_port;
	120	u16 snd_wscale : 4,
	121	rcv_wscale : 4,
	122	tstamp_ok : 1,
	123	sack_ok : 1,
	124	wscale_ok : 1,
	125	ecn_ok : 1,
	126	acked : 1;
	127	struct ip_options *opt;
	128	};
	129
60236fdd	130	static inline struct inet_request_sock inet_rsk(const struct request_sock sk)
2e6599cb ACM	131	{
	132	return (struct inet_request_sock *)sk;
	133	}
	134
1da177e4 LT	135	struct ipv6_pinfo;
	136
	137	struct inet_sock {
	138	/* sk and pinet6 has to be the first two members of inet_sock */
	139	struct sock sk;
	140	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	141	struct ipv6_pinfo *pinet6;
	142	#endif
	143	/* Socket demultiplex comparisons on incoming packets. */
	144	__u32 daddr; /* Foreign IPv4 addr */
	145	__u32 rcv_saddr; /* Bound local IPv4 addr */
	146	__u16 dport; /* Destination port */
	147	__u16 num; /* Local port */
	148	__u32 saddr; /* Sending source */
	149	__s16 uc_ttl; /* Unicast TTL */
	150	__u16 cmsg_flags;
	151	struct ip_options *opt;
	152	__u16 sport; /* Source port */
	153	__u16 id; /* ID counter for DF pkts */
	154	__u8 tos; /* TOS */
	155	__u8 mc_ttl; /* Multicasting TTL */
	156	__u8 pmtudisc;
	157	unsigned recverr : 1,
d83d8461	158	is_icsk : 1, /* inet_connection_sock? */
1da177e4 LT	159	freebind : 1,
	160	hdrincl : 1,
	161	mc_loop : 1;
	162	int mc_index; /* Multicast device index */
	163	__u32 mc_addr;
	164	struct ip_mc_socklist mc_list; / Group array */
	165	/*
	166	* Following members are used to retain the infomation to build
	167	* an ip header on each ip fragmentation while the socket is corked.
	168	*/
	169	struct {
	170	unsigned int flags;
	171	unsigned int fragsize;
	172	struct ip_options *opt;
	173	struct rtable *rt;
	174	int length; /* Total length of all frames */
	175	u32 addr;
	176	struct flowi fl;
	177	} cork;
	178	};
	179
	180	#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
	181	#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
	182
	183	static inline struct inet_sock inet_sk(const struct sock sk)
	184	{
	185	return (struct inet_sock *)sk;
	186	}
	187
	188	static inline void __inet_sk_copy_descendant(struct sock *sk_to,
	189	const struct sock *sk_from,
	190	const int ancestor_size)
	191	{
	192	memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
	193	sk_from->sk_prot->obj_size - ancestor_size);
	194	}
	195	#if !(defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE))
	196	static inline void inet_sk_copy_descendant(struct sock *sk_to,
	197	const struct sock *sk_from)
	198	{
	199	__inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
	200	}
	201	#endif
	202	#endif
	203
32519f11 ACM	204	extern int inet_sk_rebuild_header(struct sock *sk);
32519f11 ACM	205
1da177e4 LT	206	struct iphdr {
	207	#if defined(__LITTLE_ENDIAN_BITFIELD)
	208	__u8 ihl:4,
	209	version:4;
	210	#elif defined (__BIG_ENDIAN_BITFIELD)
	211	__u8 version:4,
	212	ihl:4;
	213	#else
	214	#error "Please fix <asm/byteorder.h>"
	215	#endif
	216	__u8 tos;
	217	__u16 tot_len;
	218	__u16 id;
	219	__u16 frag_off;
	220	__u8 ttl;
	221	__u8 protocol;
	222	__u16 check;
	223	__u32 saddr;
	224	__u32 daddr;
	225	/The options start here. /
	226	};
	227
	228	struct ip_auth_hdr {
	229	__u8 nexthdr;
	230	__u8 hdrlen; /* This one is measured in 32 bit units! */
	231	__u16 reserved;
	232	__u32 spi;
	233	__u32 seq_no; /* Sequence number */
	234	__u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */
	235	};
	236
	237	struct ip_esp_hdr {
	238	__u32 spi;
	239	__u32 seq_no; /* Sequence number */
	240	__u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */
	241	};
	242
	243	struct ip_comp_hdr {
	244	__u8 nexthdr;
	245	__u8 flags;
	246	__u16 cpi;
	247	};
	248
	249	#endif /* _LINUX_IP_H */