1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 *
26 * Internal IPv4 implementation-specific definitions
27 */
28
29#ifndef _IPV4_IMPL_H
30#define	_IPV4_IMPL_H
31
32#pragma ident	"%Z%%M%	%I%	%E% SMI"
33
34#ifdef	__cplusplus
35extern "C" {
36#endif
37
38#define	FRAG_MAX	(40)	/* max number of IP fragments per datagram */
39#define	FRAG_SUCCESS	(0)	/* datagram reassembled ok */
40#define	FRAG_DUP	(1)	/* duplicate ip fragment */
41#define	FRAG_NOSLOTS	(2)	/* no more ip fragment slots */
42#define	FRAG_ATTEMPTS	1	/* Try twice to get all the fragments */
43
44/*
45 * IP fragmentation data structure
46 */
47struct ip_frag {
48	int16_t		more;	/* Fragment bit (TRUE == MF, FALSE == No more */
49	int16_t		offset;	/* Offset within the encapsulated datagram */
50	mblk_t		*mp;	/* Fragment including IP header */
51	uint16_t	ipid;	/* fragment ident */
52	int16_t		iplen;	/* IP datagram's length */
53	int16_t		iphlen;	/* Len of IP header */
54	uint8_t		ipp;	/* IP protocol */
55};
56
57/*
58 * true offset is in 8 octet units. The high order 3 bits of the IP header
59 * offset field are therefore used for fragmentation flags. Shift these
60 * bits off to produce the true offset. The high order flag bit is unused
61 * (what would be considered the sign bit). Still, we cast the callers
62 * value as an unsigned quantity to ensure it is treated as positive.
63 */
64#define	IPV4_OFFSET(a)	((uint16_t)(a) << 3)
65
66#define	IPV4_VERSION	4
67#define	IPH_HDR_LENGTH(iph)	(((struct ip *)(iph))->ip_hl << 2)
68
69/* ECN code points for IPv4 TOS byte and IPv6 traffic class octet. */
70#define	IPH_ECN_NECT	0x0	/* Not ECN-Capabable Transport */
71#define	IPH_ECN_ECT1	0x1	/* ECN-Capable Transport, ECT(1) */
72#define	IPH_ECN_ECT0	0x2	/* ECN-Capable Transport, ECT(0) */
73#define	IPH_ECN_CE	0x3	/* ECN-Congestion Experienced (CE) */
74
75#define	IPV4_VERSION			4
76#define	IP_VERSION			IPV4_VERSION
77#define	IP_SIMPLE_HDR_LENGTH_IN_WORDS	5
78#define	IP_SIMPLE_HDR_LENGTH		20
79#define	IP_MAX_HDR_LENGTH		60
80
81#define	IP_MIN_MTU			(IP_MAX_HDR_LENGTH + 8)	/* 68 bytes */
82
83/*
84 * IP routing table. IP addresses are in network-order.
85 */
86struct routing {
87	struct in_addr	dest;
88	struct in_addr	gateway;
89	uint8_t		flag;
90};
91
92extern void		ipv4_raw_socket(struct inetboot_socket *, uint8_t);
93extern void		ipv4_socket_init(struct inetboot_socket *);
94extern int		ipv4_header_len(struct inetgram *);
95extern int		ipv4_input(int);
96extern int		ipv4_output(int, struct inetgram *);
97extern int		ipv4_tcp_output(int, mblk_t *);
98extern struct in_addr	*ipv4_get_route(uint8_t, struct in_addr *,
99			    struct in_addr *);
100
101#ifdef	__cplusplus
102}
103#endif
104
105#endif /* _IPV4_IMPL_H */
106