dhcpmsg.h revision 4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 
1/*
2 * Copyright 2008, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _WIFI_DHCP_H_
18#define _WIFI_DHCP_H_
19
20#include <sys/types.h>
21
22#define PORT_BOOTP_SERVER 67
23#define PORT_BOOTP_CLIENT 68
24
25/* RFC 2131 p 9 */
26typedef struct dhcp_msg dhcp_msg;
27
28#define OP_BOOTREQUEST 1
29#define OP_BOOTREPLY   2
30
31#define FLAGS_BROADCAST 0x8000
32
33#define HTYPE_ETHER    1
34
35struct dhcp_msg
36{
37    uint8_t op;           /* BOOTREQUEST / BOOTREPLY    */
38    uint8_t htype;        /* hw addr type               */
39    uint8_t hlen;         /* hw addr len                */
40    uint8_t hops;         /* client set to 0            */
41
42    uint32_t xid;         /* transaction id             */
43
44    uint16_t secs;        /* seconds since start of acq */
45    uint16_t flags;
46
47    uint32_t ciaddr;      /* client IP addr             */
48    uint32_t yiaddr;      /* your (client) IP addr      */
49    uint32_t siaddr;      /* ip addr of next server     */
50                          /* (DHCPOFFER and DHCPACK)    */
51    uint32_t giaddr;      /* relay agent IP addr        */
52
53    uint8_t chaddr[16];  /* client hw addr             */
54    char sname[64];      /* asciiz server hostname     */
55    char file[128];      /* asciiz boot file name      */
56
57    uint8_t options[1024];  /* optional parameters        */
58};
59
60#define DHCP_MSG_FIXED_SIZE 236
61
62/* first four bytes of options are a cookie to indicate that
63** the payload are DHCP options as opposed to some other BOOTP
64** extension.
65*/
66#define OPT_COOKIE1          0x63
67#define OPT_COOKIE2          0x82
68#define OPT_COOKIE3          0x53
69#define OPT_COOKIE4          0x63
70
71/* BOOTP/DHCP options - see RFC 2132 */
72#define OPT_PAD              0
73
74#define OPT_SUBNET_MASK      1     /* 4 <ipaddr> */
75#define OPT_TIME_OFFSET      2     /* 4 <seconds> */
76#define OPT_GATEWAY          3     /* 4*n <ipaddr> * n */
77#define OPT_DNS              6     /* 4*n <ipaddr> * n */
78#define OPT_DOMAIN_NAME      15    /* n <domainnamestring> */
79#define OPT_BROADCAST_ADDR   28    /* 4 <ipaddr> */
80
81#define OPT_REQUESTED_IP     50    /* 4 <ipaddr> */
82#define OPT_LEASE_TIME       51    /* 4 <seconds> */
83#define OPT_MESSAGE_TYPE     53    /* 1 <msgtype> */
84#define OPT_SERVER_ID        54    /* 4 <ipaddr> */
85#define OPT_PARAMETER_LIST   55    /* n <optcode> * n */
86#define OPT_MESSAGE          56    /* n <errorstring> */
87#define OPT_CLASS_ID         60    /* n <opaque> */
88#define OPT_CLIENT_ID        61    /* n <opaque> */
89#define OPT_END              255
90
91/* DHCP message types */
92#define DHCPDISCOVER         1
93#define DHCPOFFER            2
94#define DHCPREQUEST          3
95#define DHCPDECLINE          4
96#define DHCPACK              5
97#define DHCPNAK              6
98#define DHCPRELEASE          7
99#define DHCPINFORM           8
100
101int init_dhcp_discover_msg(dhcp_msg *msg, void *hwaddr, uint32_t xid);
102
103int init_dhcp_request_msg(dhcp_msg *msg, void *hwaddr, uint32_t xid,
104                          uint32_t ipaddr, uint32_t serveraddr);
105
106#endif
107