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 */
25
26#ifndef	_PACKET_H
27#define	_PACKET_H
28
29#pragma ident	"%Z%%M%	%I%	%E% SMI"
30
31#include <sys/types.h>
32#include <netinet/in.h>
33#include <netinet/dhcp.h>
34#include <netinet/dhcp6.h>
35#include <dhcp_impl.h>
36
37#include "common.h"
38
39/*
40 * packet.[ch] contain routines for manipulating, setting, and
41 * transmitting DHCP/BOOTP packets.  see packet.c for descriptions on
42 * how to use the exported functions.
43 */
44
45#ifdef	__cplusplus
46extern "C" {
47#endif
48
49/*
50 * data type for recv_pkt().  needed because we may want to wait for
51 * several kinds of packets at once, and the existing enumeration of
52 * DHCP packet types does not provide a way to do that easily.  here,
53 * we light a different bit in the enumeration for each type of packet
54 * we want to receive.
55 *
56 * Note that for DHCPv6, types 4 (CONFIRM), 5 (RENEW), 6 (REBIND), 12
57 * (RELAY-FORW, and 13 (RELAY-REPL) are not in the table.  They're never
58 * received by a client, so there's no reason to process them.  (SOLICIT,
59 * REQUEST, DECLINE, RELEASE, and INFORMATION-REQUEST are also never seen by
60 * clients, but are included for consistency.)
61 *
62 * Note also that the symbols are named for the DHCPv4 message types, and that
63 * DHCPv6 has analogous message types.
64 */
65
66typedef enum {
67
68	DHCP_PUNTYPED	= 0x001,	/* untyped (BOOTP) message */
69	DHCP_PDISCOVER	= 0x002,	/* in v6: SOLICIT (1) */
70	DHCP_POFFER 	= 0x004,	/* in v6: ADVERTISE (2) */
71	DHCP_PREQUEST	= 0x008,	/* in v6: REQUEST (3) */
72	DHCP_PDECLINE	= 0x010,	/* in v6: DECLINE (9) */
73	DHCP_PACK	= 0x020,	/* in v6: REPLY (7), status == 0 */
74	DHCP_PNAK	= 0x040,	/* in v6: REPLY (7), status != 0 */
75	DHCP_PRELEASE	= 0x080,	/* in v6: RELEASE (8) */
76	DHCP_PINFORM	= 0x100,	/* in v6: INFORMATION-REQUEST (11) */
77	DHCP_PRECONFIG	= 0x200		/* v6 only: RECONFIGURE (10) */
78
79} dhcp_message_type_t;
80
81/*
82 * A dhcp_pkt_t is used by the output-side packet manipulation functions.
83 * While the structure is not strictly necessary, it allows a better separation
84 * of functionality since metadata about the packet (such as its current
85 * length) is stored along with the packet.
86 *
87 * Note that 'pkt' points to a dhcpv6_message_t if the packet is IPv6.
88 */
89
90typedef struct dhcp_pkt_s {
91	PKT		*pkt;		/* the real underlying packet */
92	unsigned int	pkt_max_len; 	/* its maximum length */
93	unsigned int	pkt_cur_len;	/* its current length */
94	boolean_t	pkt_isv6;
95} dhcp_pkt_t;
96
97/*
98 * a `stop_func_t' is used by parts of dhcpagent that use the
99 * retransmission capability of send_pkt().  this makes it so the
100 * callers of send_pkt() decide when to stop retransmitting, which
101 * makes more sense than hardcoding their instance-specific cases into
102 * packet.c
103 */
104
105typedef boolean_t stop_func_t(dhcp_smach_t *, unsigned int);
106
107/*
108 * Default I/O and interface control sockets.
109 */
110extern int v6_sock_fd;
111extern int v4_sock_fd;
112
113extern const in6_addr_t ipv6_all_dhcp_relay_and_servers;
114extern const in6_addr_t my_in6addr_any;
115
116PKT_LIST	*alloc_pkt_entry(size_t, boolean_t);
117void		free_pkt_entry(PKT_LIST *);
118void		free_pkt_list(PKT_LIST **);
119uchar_t		pkt_recv_type(const PKT_LIST *);
120uint_t		pkt_get_xid(const PKT *, boolean_t);
121dhcp_pkt_t	*init_pkt(dhcp_smach_t *, uchar_t);
122boolean_t	remove_pkt_opt(dhcp_pkt_t *, uint_t);
123boolean_t	update_v6opt_len(dhcpv6_option_t *, int);
124void		*add_pkt_opt(dhcp_pkt_t *, uint_t, const void *, uint_t);
125void		*add_pkt_subopt(dhcp_pkt_t *, dhcpv6_option_t *, uint_t,
126		    const void *, uint_t);
127void		*add_pkt_opt16(dhcp_pkt_t *, uint_t, uint16_t);
128void		*add_pkt_opt32(dhcp_pkt_t *, uint_t, uint32_t);
129void		*add_pkt_prl(dhcp_pkt_t *, dhcp_smach_t *);
130boolean_t	add_pkt_lif(dhcp_pkt_t *, dhcp_lif_t *, int, const char *);
131void		stop_pkt_retransmission(dhcp_smach_t *);
132void		retransmit_now(dhcp_smach_t *);
133PKT_LIST	*recv_pkt(int, int, boolean_t);
134boolean_t	pkt_v4_match(uchar_t, dhcp_message_type_t);
135void		pkt_smach_enqueue(dhcp_smach_t *, PKT_LIST *);
136boolean_t	send_pkt(dhcp_smach_t *, dhcp_pkt_t *, in_addr_t,
137		    stop_func_t *);
138boolean_t	send_pkt_v6(dhcp_smach_t *, dhcp_pkt_t *, in6_addr_t,
139		    stop_func_t *, uint_t, uint_t);
140boolean_t	dhcp_ip_default(void);
141
142#ifdef	__cplusplus
143}
144#endif
145
146#endif	/* _PACKET_H */
147