/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
 */

#ifndef _DHCP_IMPL_H
#define _DHCP_IMPL_H

/*
 * Common definitions used by Sun DHCP implementations
 */

#ifdef  __cplusplus
extern "C" {
#endif

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/udp.h>
#include <netinet/dhcp.h>
#include <netinet/dhcp6.h>
#include <dhcp_symbol_common.h>
#include <sys/sunos_dhcp_class.h>

/* Packet fields */
#define CD_PACKET_START         0
#define CD_POPCODE              0       /* packet opcode */
#define CD_PHTYPE               1       /* packet header type */
#define CD_PHLEN                2       /* packet header len */
#define CD_PHOPS                3       /* packet header len */
#define CD_PXID                 4       /* packet hops */
#define CD_PSECS                8       /* packet xid */
#define CD_PFLAGS               10      /* packet secs */
#define CD_PCIADDR              12      /* packet flags */
#define CD_YIADDR               16      /* client's ip address */
#define CD_SIADDR               20      /* Bootserver's ip address */
#define CD_GIADDR               24      /* BOOTP relay agent address */
#define CD_PCHADDR              28      /* BOOTP relay agent address */
#define CD_SNAME                44      /* Hostname of Bootserver, or opts */
#define CD_BOOTFILE             108     /* File to boot or opts */
#define CD_PCOOKIE              236     /* packet cookie */
#define CD_POPTIONS             240     /* packet options */
#define CD_PACKET_END           CD_POPTIONS

/* Internal server options */
#define CD_INTRNL_START         1024
#define CD_BOOL_HOSTNAME        1024    /* Entry wants hostname (Nameserv) */
#define CD_BOOL_LEASENEG        1025    /* Entry's lease is negotiable */
#define CD_BOOL_ECHO_VCLASS     1026    /* Echo Vendor class back to Entry */
#define CD_BOOTPATH             1027    /* prefix path to File to boot */
#define CD_INTRNL_END           1027

/* Error codes that could be generated while parsing packets */
#define DHCP_ERR_OFFSET         512
#define DHCP_GARBLED_MSG_TYPE   (DHCP_ERR_OFFSET+0)
#define DHCP_WRONG_MSG_TYPE     (DHCP_ERR_OFFSET+1)
#define DHCP_BAD_OPT_OVLD       (DHCP_ERR_OFFSET+2)

/*
 * Arbitrary "maximum" client ID length (in bytes), used by various bits
 * of the standalone code.  This needs to go away someday.
 */
#define DHCP_MAX_CID_LEN        64

/*
 * Generic DHCP option structure.
 */
typedef struct {
        uint8_t    code;
        uint8_t    len;
        uint8_t    value[1];
} DHCP_OPT;

/*
 * Defines the size of DHCP_OPT code + len
 */
#define DHCP_OPT_META_LEN       2

typedef union sockaddr46_s {
        struct sockaddr_in v4;
        struct sockaddr_in6 v6;
} sockaddr46_t;

/*
 * Generic DHCP packet list. Ensure that _REENTRANT bracketed code stays at
 * bottom of this definition - the client doesn't include it. Scan.c in
 * libdhcp isn't aware of it either...
 *
 * The PKT * pointer here actually points to a dhcpv6_message_t if the packet
 * is DHCPv6.  We assume that PKT * the same or stricter alignment
 * requirements, and that the unused elements are not a significant burden.
 */
#define MAX_PKT_LIST    5       /* maximum list size */
typedef struct  dhcp_list {
        struct dhcp_list        *next;          /* keep first and in this */
        struct dhcp_list        *prev;          /* order for insque/remque */

        PKT                     *pkt;           /* client packet */
        uint_t                  len;            /* packet len */
        int                     rfc1048;        /* RFC1048 options - boolean */
        uint8_t                 offset;         /* BOOTP packet offset */
        uint8_t                 isv6;           /* DHCPv6 packet - boolean */
                                /*
                                 * standard/site options
                                 */
        DHCP_OPT                *opts[DHCP_LAST_OPT + 1];

                                /*
                                 * Vendor specific options (client only)
                                 */
        DHCP_OPT                *vs[VS_OPTION_END - VS_OPTION_START + 1];

        struct in_addr          off_ip;         /* Address OFFERed */

        uint_t                  ifindex; /* received ifindex (if any) */
        sockaddr46_t            pktfrom; /* source (peer) address on input */
        sockaddr46_t            pktto;  /* destination (local) address */

} PKT_LIST;

extern int dhcp_options_scan(PKT_LIST *, boolean_t);
extern boolean_t dhcp_getinfo_pl(PKT_LIST *, uchar_t, uint16_t, uint16_t,
    void *, size_t *);
extern dhcpv6_option_t *dhcpv6_find_option(const void *, size_t,
    const dhcpv6_option_t *, uint16_t, uint_t *);
extern dhcpv6_option_t *dhcpv6_pkt_option(const PKT_LIST *,
    const dhcpv6_option_t *, uint16_t, uint_t *);

#ifdef  __cplusplus
}
#endif

#endif  /* _DHCP_IMPL_H */