xref: /illumos-gate/usr/src/common/net/dhcp/dhcp_impl.h (revision b31320a79e2054c6739b5229259dbf98f3afc547)
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
35 extern "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  */
90 typedef 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 
101 typedef 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 */
116 typedef 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 
143 extern int dhcp_options_scan(PKT_LIST *, boolean_t);
144 extern boolean_t dhcp_getinfo_pl(PKT_LIST *, uchar_t, uint16_t, uint16_t,
145     void *, size_t *);
146 extern dhcpv6_option_t *dhcpv6_find_option(const void *, size_t,
147     const dhcpv6_option_t *, uint16_t, uint_t *);
148 extern 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