3 Protocol structures... */
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42 #define DHCP_UDP_OVERHEAD (14 + /* Ethernet header */ \
43 20 + /* IP header */ \
45 #define DHCP_SNAME_LEN 64
46 #define DHCP_FILE_LEN 128
47 #define DHCP_FIXED_NON_UDP 236
48 #define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD)
49 /* Everything but options. */
50 #define DHCP_MTU_MAX 1500
51 #define DHCP_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN)
53 #define BOOTP_MIN_LEN 300
54 #define DHCP_MIN_LEN 548
57 u_int8_t op; /* 0: Message opcode/type */
58 u_int8_t htype; /* 1: Hardware addr type (net/if_types.h) */
59 u_int8_t hlen; /* 2: Hardware addr length */
60 u_int8_t hops; /* 3: Number of relay agent hops from client */
61 u_int32_t xid; /* 4: Transaction ID */
62 u_int16_t secs; /* 8: Seconds since client started looking */
63 u_int16_t flags; /* 10: Flag bits */
64 struct in_addr ciaddr; /* 12: Client IP address (if already in use) */
65 struct in_addr yiaddr; /* 16: Client IP address */
66 struct in_addr siaddr; /* 18: IP address of next server to talk to */
67 struct in_addr giaddr; /* 20: DHCP relay agent IP address */
68 unsigned char chaddr [16]; /* 24: Client hardware address */
69 char sname [DHCP_SNAME_LEN]; /* 40: Server name */
70 char file [DHCP_FILE_LEN]; /* 104: Boot filename */
71 unsigned char options [DHCP_OPTION_LEN];
72 /* 212: Optional parameters
73 (actual length dependent on MTU). */
76 /* BOOTP (rfc951) message types */
80 /* Possible values for flags field... */
81 #define BOOTP_BROADCAST 32768L
83 /* Possible values for hardware type (htype) field... */
84 #define HTYPE_ETHER 1 /* Ethernet 10Mbps */
85 #define HTYPE_IEEE802 6 /* IEEE 802.2 Token Ring... */
86 #define HTYPE_FDDI 8 /* FDDI... */
88 /* Magic cookie validating dhcp options field (and bootp vendor
90 #define DHCP_OPTIONS_COOKIE "\143\202\123\143"
92 /* DHCP Option codes: */
95 #define DHO_SUBNET_MASK 1
96 #define DHO_TIME_OFFSET 2
98 #define DHO_TIME_SERVERS 4
99 #define DHO_NAME_SERVERS 5
100 #define DHO_DOMAIN_NAME_SERVERS 6
101 #define DHO_LOG_SERVERS 7
102 #define DHO_COOKIE_SERVERS 8
103 #define DHO_LPR_SERVERS 9
104 #define DHO_IMPRESS_SERVERS 10
105 #define DHO_RESOURCE_LOCATION_SERVERS 11
106 #define DHO_HOST_NAME 12
107 #define DHO_BOOT_SIZE 13
108 #define DHO_MERIT_DUMP 14
109 #define DHO_DOMAIN_NAME 15
110 #define DHO_SWAP_SERVER 16
111 #define DHO_ROOT_PATH 17
112 #define DHO_EXTENSIONS_PATH 18
113 #define DHO_IP_FORWARDING 19
114 #define DHO_NON_LOCAL_SOURCE_ROUTING 20
115 #define DHO_POLICY_FILTER 21
116 #define DHO_MAX_DGRAM_REASSEMBLY 22
117 #define DHO_DEFAULT_IP_TTL 23
118 #define DHO_PATH_MTU_AGING_TIMEOUT 24
119 #define DHO_PATH_MTU_PLATEAU_TABLE 25
120 #define DHO_INTERFACE_MTU 26
121 #define DHO_ALL_SUBNETS_LOCAL 27
122 #define DHO_BROADCAST_ADDRESS 28
123 #define DHO_PERFORM_MASK_DISCOVERY 29
124 #define DHO_MASK_SUPPLIER 30
125 #define DHO_ROUTER_DISCOVERY 31
126 #define DHO_ROUTER_SOLICITATION_ADDRESS 32
127 #define DHO_STATIC_ROUTES 33
128 #define DHO_TRAILER_ENCAPSULATION 34
129 #define DHO_ARP_CACHE_TIMEOUT 35
130 #define DHO_IEEE802_3_ENCAPSULATION 36
131 #define DHO_DEFAULT_TCP_TTL 37
132 #define DHO_TCP_KEEPALIVE_INTERVAL 38
133 #define DHO_TCP_KEEPALIVE_GARBAGE 39
134 #define DHO_NIS_DOMAIN 40
135 #define DHO_NIS_SERVERS 41
136 #define DHO_NTP_SERVERS 42
137 #define DHO_VENDOR_ENCAPSULATED_OPTIONS 43
138 #define DHO_NETBIOS_NAME_SERVERS 44
139 #define DHO_NETBIOS_DD_SERVER 45
140 #define DHO_NETBIOS_NODE_TYPE 46
141 #define DHO_NETBIOS_SCOPE 47
142 #define DHO_FONT_SERVERS 48
143 #define DHO_X_DISPLAY_MANAGER 49
144 #define DHO_DHCP_REQUESTED_ADDRESS 50
145 #define DHO_DHCP_LEASE_TIME 51
146 #define DHO_DHCP_OPTION_OVERLOAD 52
147 #define DHO_DHCP_MESSAGE_TYPE 53
148 #define DHO_DHCP_SERVER_IDENTIFIER 54
149 #define DHO_DHCP_PARAMETER_REQUEST_LIST 55
150 #define DHO_DHCP_MESSAGE 56
151 #define DHO_DHCP_MAX_MESSAGE_SIZE 57
152 #define DHO_DHCP_RENEWAL_TIME 58
153 #define DHO_DHCP_REBINDING_TIME 59
154 #define DHO_VENDOR_CLASS_IDENTIFIER 60
155 #define DHO_DHCP_CLIENT_IDENTIFIER 61
156 #define DHO_NWIP_DOMAIN_NAME 62
157 #define DHO_NWIP_SUBOPTIONS 63
158 #define DHO_USER_CLASS 77
160 #define DHO_DHCP_AGENT_OPTIONS 82
161 #define DHO_SUBNET_SELECTION 118 /* RFC3011! */
162 /* The DHO_AUTHENTICATE option is not a standard yet, so I've
163 allocated an option out of the "local" option space for it on a
164 temporary basis. Once an option code number is assigned, I will
165 immediately and shamelessly break this, so don't count on it
166 continuing to work. */
167 #define DHO_AUTHENTICATE 210
171 /* DHCP message types. */
172 #define DHCPDISCOVER 1
174 #define DHCPREQUEST 3
175 #define DHCPDECLINE 4
178 #define DHCPRELEASE 7
181 /* Relay Agent Information option subtypes: */
182 #define RAI_CIRCUIT_ID 1
183 #define RAI_REMOTE_ID 2
184 #define RAI_AGENT_ID 3
186 /* FQDN suboptions: */
187 #define FQDN_NO_CLIENT_UPDATE 1
188 #define FQDN_SERVER_UPDATE 2
189 #define FQDN_ENCODED 3
190 #define FQDN_RCODE1 4
191 #define FQDN_RCODE2 5
192 #define FQDN_HOSTNAME 6
193 #define FQDN_DOMAINNAME 7
195 #define FQDN_SUBOPTION_COUNT 8