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/* $OpenBSD: dhcp.h,v 1.21 2017/07/24 16:17:35 krw Exp $ */
/* Protocol structures. */
/*
* Copyright (c) 1995, 1996 The Internet Software Consortium.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The Internet Software Consortium nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This software has been written for the Internet Software Consortium
* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
* Enterprises. To learn more about the Internet Software Consortium,
* see ``http://www.vix.com/isc''. To learn more about Vixie
* Enterprises, see ``http://www.vix.com''.
*/
#define DHCP_UDP_OVERHEAD (20 + /* IP header */ \
8) /* UDP header */
#define DHCP_SNAME_LEN 64
#define DHCP_FILE_LEN 128
#define DHCP_FIXED_NON_UDP 236
#define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD)
/* Everything but options. */
#define DHCP_MTU_MAX 1500
#define DHCP_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN)
/* Respect historical limits on 'search' line in resolv.conf(5) */
#define DHCP_DOMAIN_SEARCH_LEN 1024
#define DHCP_DOMAIN_SEARCH_CNT 6
#define BOOTP_MIN_LEN 300
struct dhcp_packet {
uint8_t op; /* Message opcode/type */
uint8_t htype; /* Hardware addr type (see net/if_types.h) */
uint8_t hlen; /* Hardware addr length */
uint8_t hops; /* Number of relay agent hops from client */
uint32_t xid; /* Transaction ID */
uint16_t secs; /* Seconds since client started looking */
uint16_t flags; /* Flag bits */
struct in_addr ciaddr; /* Client IP address (if already in use) */
struct in_addr yiaddr; /* Client IP address */
struct in_addr siaddr; /* IP address of next server to talk to */
struct in_addr giaddr; /* DHCP relay agent IP address */
unsigned char chaddr[16]; /* Client hardware address */
char sname[DHCP_SNAME_LEN]; /* Server name */
char file[DHCP_FILE_LEN]; /* Boot filename */
unsigned char options[DHCP_OPTION_LEN];
/* Optional parameters
(actual length dependent on MTU). */
};
/* BOOTP (rfc951) message types */
#define BOOTREQUEST 1
#define BOOTREPLY 2
/* Possible values for flags field. */
#define BOOTP_BROADCAST 32768L
/* Possible values for hardware type (htype) field. */
#define HTYPE_ETHER 1 /* Ethernet */
#define HTYPE_IPSEC_TUNNEL 31 /* IPsec Tunnel (RFC3456) */
/*
* Magic cookie validating dhcp options field (and bootp vendor
* extensions field).
*/
#define DHCP_OPTIONS_COOKIE "\143\202\123\143"
#define DHCP_OPTIONS_COOKIE_LEN 4
#define DHCP_OPTIONS_MESSAGE_TYPE "\065\001\000"
/* DHCP Option codes: */
#define DHO_PAD 0
#define DHO_SUBNET_MASK 1
#define DHO_TIME_OFFSET 2
#define DHO_ROUTERS 3
#define DHO_TIME_SERVERS 4
#define DHO_NAME_SERVERS 5
#define DHO_DOMAIN_NAME_SERVERS 6
#define DHO_LOG_SERVERS 7
#define DHO_COOKIE_SERVERS 8
#define DHO_LPR_SERVERS 9
#define DHO_IMPRESS_SERVERS 10
#define DHO_RESOURCE_LOCATION_SERVERS 11
#define DHO_HOST_NAME 12
#define DHO_BOOT_SIZE 13
#define DHO_MERIT_DUMP 14
#define DHO_DOMAIN_NAME 15
#define DHO_SWAP_SERVER 16
#define DHO_ROOT_PATH 17
#define DHO_EXTENSIONS_PATH 18
#define DHO_IP_FORWARDING 19
#define DHO_NON_LOCAL_SOURCE_ROUTING 20
#define DHO_POLICY_FILTER 21
#define DHO_MAX_DGRAM_REASSEMBLY 22
#define DHO_DEFAULT_IP_TTL 23
#define DHO_PATH_MTU_AGING_TIMEOUT 24
#define DHO_PATH_MTU_PLATEAU_TABLE 25
#define DHO_INTERFACE_MTU 26
#define DHO_ALL_SUBNETS_LOCAL 27
#define DHO_BROADCAST_ADDRESS 28
#define DHO_PERFORM_MASK_DISCOVERY 29
#define DHO_MASK_SUPPLIER 30
#define DHO_ROUTER_DISCOVERY 31
#define DHO_ROUTER_SOLICITATION_ADDRESS 32
#define DHO_STATIC_ROUTES 33
#define DHO_TRAILER_ENCAPSULATION 34
#define DHO_ARP_CACHE_TIMEOUT 35
#define DHO_IEEE802_3_ENCAPSULATION 36
#define DHO_DEFAULT_TCP_TTL 37
#define DHO_TCP_KEEPALIVE_INTERVAL 38
#define DHO_TCP_KEEPALIVE_GARBAGE 39
#define DHO_NIS_DOMAIN 40
#define DHO_NIS_SERVERS 41
#define DHO_NTP_SERVERS 42
#define DHO_VENDOR_ENCAPSULATED_OPTIONS 43
#define DHO_NETBIOS_NAME_SERVERS 44
#define DHO_NETBIOS_DD_SERVER 45
#define DHO_NETBIOS_NODE_TYPE 46
#define DHO_NETBIOS_SCOPE 47
#define DHO_FONT_SERVERS 48
#define DHO_X_DISPLAY_MANAGER 49
#define DHO_DHCP_REQUESTED_ADDRESS 50
#define DHO_DHCP_LEASE_TIME 51
#define DHO_DHCP_OPTION_OVERLOAD 52
#define DHO_DHCP_MESSAGE_TYPE 53
#define DHO_DHCP_SERVER_IDENTIFIER 54
#define DHO_DHCP_PARAMETER_REQUEST_LIST 55
#define DHO_DHCP_MESSAGE 56
#define DHO_DHCP_MAX_MESSAGE_SIZE 57
#define DHO_DHCP_RENEWAL_TIME 58
#define DHO_DHCP_REBINDING_TIME 59
#define DHO_DHCP_CLASS_IDENTIFIER 60
#define DHO_DHCP_CLIENT_IDENTIFIER 61
#define DHO_NISPLUS_DOMAIN 64
#define DHO_NISPLUS_SERVERS 65
#define DHO_TFTP_SERVER 66
#define DHO_BOOTFILE_NAME 67
#define DHO_MOBILE_IP_HOME_AGENT 68
#define DHO_SMTP_SERVER 69
#define DHO_POP_SERVER 70
#define DHO_NNTP_SERVER 71
#define DHO_WWW_SERVER 72
#define DHO_FINGER_SERVER 73
#define DHO_IRC_SERVER 74
#define DHO_STREETTALK_SERVER 75
#define DHO_STREETTALK_DIRECTORY_ASSISTANCE_SERVER 76
#define DHO_DHCP_USER_CLASS_ID 77
#define DHO_RELAY_AGENT_INFORMATION 82
#define DHO_NDS_SERVERS 85
#define DHO_NDS_TREE_NAME 86
#define DHO_NDS_CONTEXT 87
#define DHO_DOMAIN_SEARCH 119
#define DHO_CLASSLESS_STATIC_ROUTES 121
#define DHO_TFTP_CONFIG_FILE 144
#define DHO_VOIP_CONFIGURATION_SERVER 150
#define DHO_CLASSLESS_MS_STATIC_ROUTES 249
#define DHO_AUTOPROXY_SCRIPT 252
#define DHO_END 255
#define DHO_COUNT 256 /* # of DHCP options */
/* DHCP message types. */
#define DHCPDISCOVER 1
#define DHCPOFFER 2
#define DHCPREQUEST 3
#define DHCPDECLINE 4
#define DHCPACK 5
#define DHCPNAK 6
#define DHCPRELEASE 7
#define DHCPINFORM 8
/* Relay Agent Information sub-options */
#define RAI_CIRCUIT_ID 1
#define RAI_REMOTE_ID 2
#define RAI_AGENT_ID 3
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