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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 * Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
25 */
26
27#ifndef	_DHCP_IMPL_H
28#define	_DHCP_IMPL_H
29
30/*
31 * Common definitions used by Sun DHCP implementations
32 */
33
34#ifdef	__cplusplus
35extern "C" {
36#endif
37
38#include <sys/types.h>
39#include <sys/socket.h>
40#include <netinet/in.h>
41#include <netinet/udp.h>
42#include <netinet/dhcp.h>
43#include <netinet/dhcp6.h>
44#include <dhcp_symbol_common.h>
45#include <sys/sunos_dhcp_class.h>
46
47/* Packet fields */
48#define	CD_PACKET_START		0
49#define	CD_POPCODE		0	/* packet opcode */
50#define	CD_PHTYPE		1	/* packet header type */
51#define	CD_PHLEN		2	/* packet header len */
52#define	CD_PHOPS		3	/* packet header len */
53#define	CD_PXID			4	/* packet hops */
54#define	CD_PSECS		8	/* packet xid */
55#define	CD_PFLAGS		10	/* packet secs */
56#define	CD_PCIADDR		12	/* packet flags */
57#define	CD_YIADDR		16	/* client's ip address */
58#define	CD_SIADDR		20	/* Bootserver's ip address */
59#define	CD_GIADDR		24	/* BOOTP relay agent address */
60#define	CD_PCHADDR		28	/* BOOTP relay agent address */
61#define	CD_SNAME		44	/* Hostname of Bootserver, or opts */
62#define	CD_BOOTFILE		108	/* File to boot or opts */
63#define	CD_PCOOKIE		236	/* packet cookie */
64#define	CD_POPTIONS		240	/* packet options */
65#define	CD_PACKET_END		CD_POPTIONS
66
67/* Internal server options */
68#define	CD_INTRNL_START		1024
69#define	CD_BOOL_HOSTNAME	1024	/* Entry wants hostname (Nameserv) */
70#define	CD_BOOL_LEASENEG	1025	/* Entry's lease is negotiable */
71#define	CD_BOOL_ECHO_VCLASS	1026	/* Echo Vendor class back to Entry */
72#define	CD_BOOTPATH		1027	/* prefix path to File to boot */
73#define	CD_INTRNL_END		1027
74
75/* Error codes that could be generated while parsing packets */
76#define	DHCP_ERR_OFFSET		512
77#define	DHCP_GARBLED_MSG_TYPE	(DHCP_ERR_OFFSET+0)
78#define	DHCP_WRONG_MSG_TYPE	(DHCP_ERR_OFFSET+1)
79#define	DHCP_BAD_OPT_OVLD	(DHCP_ERR_OFFSET+2)
80
81/*
82 * Arbitrary "maximum" client ID length (in bytes), used by various bits
83 * of the standalone code.  This needs to go away someday.
84 */
85#define	DHCP_MAX_CID_LEN	64
86
87/*
88 * Generic DHCP option structure.
89 */
90typedef struct {
91	uint8_t    code;
92	uint8_t    len;
93	uint8_t    value[1];
94} DHCP_OPT;
95
96/*
97 * Defines the size of DHCP_OPT code + len
98 */
99#define	DHCP_OPT_META_LEN	2
100
101typedef union sockaddr46_s {
102	struct sockaddr_in v4;
103	struct sockaddr_in6 v6;
104} sockaddr46_t;
105
106/*
107 * Generic DHCP packet list. Ensure that _REENTRANT bracketed code stays at
108 * bottom of this definition - the client doesn't include it. Scan.c in
109 * libdhcp isn't aware of it either...
110 *
111 * The PKT * pointer here actually points to a dhcpv6_message_t if the packet
112 * is DHCPv6.  We assume that PKT * the same or stricter alignment
113 * requirements, and that the unused elements are not a significant burden.
114 */
115#define	MAX_PKT_LIST	5	/* maximum list size */
116typedef struct  dhcp_list {
117	struct dhcp_list 	*next;		/* keep first and in this */
118	struct dhcp_list 	*prev;		/* order for insque/remque */
119
120	PKT			*pkt;		/* client packet */
121	uint_t			len;		/* packet len */
122	int			rfc1048;	/* RFC1048 options - boolean */
123	uint8_t			offset;		/* BOOTP packet offset */
124	uint8_t			isv6;		/* DHCPv6 packet - boolean */
125				/*
126				 * standard/site options
127				 */
128	DHCP_OPT		*opts[DHCP_LAST_OPT + 1];
129
130				/*
131				 * Vendor specific options (client only)
132				 */
133	DHCP_OPT		*vs[VS_OPTION_END - VS_OPTION_START + 1];
134
135	struct in_addr		off_ip;		/* Address OFFERed */
136
137	uint_t			ifindex; /* received ifindex (if any) */
138	sockaddr46_t		pktfrom; /* source (peer) address on input */
139	sockaddr46_t		pktto;	/* destination (local) address */
140
141} PKT_LIST;
142
143extern int dhcp_options_scan(PKT_LIST *, boolean_t);
144extern boolean_t dhcp_getinfo_pl(PKT_LIST *, uchar_t, uint16_t, uint16_t,
145    void *, size_t *);
146extern dhcpv6_option_t *dhcpv6_find_option(const void *, size_t,
147    const dhcpv6_option_t *, uint16_t, uint_t *);
148extern dhcpv6_option_t *dhcpv6_pkt_option(const PKT_LIST *,
149    const dhcpv6_option_t *, uint16_t, uint_t *);
150
151#ifdef	__cplusplus
152}
153#endif
154
155#endif	/* _DHCP_IMPL_H */
156