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8#ifndef UDHCP_COMMON_H
9#define UDHCP_COMMON_H 1
10
11#include "libbb.h"
12#include <netinet/udp.h>
13#include <netinet/ip.h>
14
15PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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17extern const uint8_t MAC_BCAST_ADDR[6];
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22
23#define DHCP_MAGIC 0x63825363
24#define DHCP_OPTIONS_BUFSIZE 308
25#define BOOTREQUEST 1
26#define BOOTREPLY 2
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28
29struct dhcp_packet {
30 uint8_t op;
31 uint8_t htype;
32 uint8_t hlen;
33 uint8_t hops;
34 uint32_t xid;
35 uint16_t secs;
36 uint16_t flags;
37#define BROADCAST_FLAG 0x8000
38 uint32_t ciaddr;
39 uint32_t yiaddr;
40
41 uint32_t siaddr_nip;
42 uint32_t gateway_nip;
43 uint8_t chaddr[16];
44 uint8_t sname[64];
45 uint8_t file[128];
46 uint32_t cookie;
47 uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
48} PACKED;
49#define DHCP_PKT_SNAME_LEN 64
50#define DHCP_PKT_FILE_LEN 128
51#define DHCP_PKT_SNAME_LEN_STR "64"
52#define DHCP_PKT_FILE_LEN_STR "128"
53
54struct ip_udp_dhcp_packet {
55 struct iphdr ip;
56 struct udphdr udp;
57 struct dhcp_packet data;
58} PACKED;
59
60struct udp_dhcp_packet {
61 struct udphdr udp;
62 struct dhcp_packet data;
63} PACKED;
64
65enum {
66 IP_UDP_DHCP_SIZE = sizeof(struct ip_udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
67 UDP_DHCP_SIZE = sizeof(struct udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
68 DHCP_SIZE = sizeof(struct dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
69};
70
71
72struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
73 char c[IP_UDP_DHCP_SIZE == 576 ? 1 : -1];
74};
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78
79enum {
80 OPTION_IP = 1,
81 OPTION_IP_PAIR,
82 OPTION_STRING,
83
84 OPTION_U8,
85 OPTION_U16,
86
87 OPTION_U32,
88 OPTION_S32,
89 OPTION_BIN,
90 OPTION_STATIC_ROUTES,
91#if ENABLE_FEATURE_UDHCP_RFC3397
92 OPTION_DNS_STRING,
93 OPTION_SIP_SERVERS,
94#endif
95
96 OPTION_TYPE_MASK = 0x0f,
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98 OPTION_REQ = 0x10,
99
100 OPTION_LIST = 0x20,
101};
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108#define DHCP_PADDING 0x00
109#define DHCP_SUBNET 0x01
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118#define DHCP_HOST_NAME 0x0c
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131#define DHCP_REQUESTED_IP 0x32
132#define DHCP_LEASE_TIME 0x33
133#define DHCP_OPTION_OVERLOAD 0x34
134#define DHCP_MESSAGE_TYPE 0x35
135#define DHCP_SERVER_ID 0x36
136#define DHCP_PARAM_REQ 0x37
137
138#define DHCP_MAX_SIZE 0x39
139#define DHCP_VENDOR 0x3c
140#define DHCP_CLIENT_ID 0x3d
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143
144#define DHCP_FQDN 0x51
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149
150#define DHCP_END 0xff
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152
153#define OPT_CODE 0
154#define OPT_LEN 1
155#define OPT_DATA 2
156
157#define OPTION_FIELD 0
158#define FILE_FIELD 1
159#define SNAME_FIELD 2
160
161
162#define DHCPDISCOVER 1
163#define DHCPOFFER 2
164#define DHCPREQUEST 3
165#define DHCPDECLINE 4
166#define DHCPACK 5
167#define DHCPNAK 6
168#define DHCPRELEASE 7
169#define DHCPINFORM 8
170#define DHCP_MINTYPE DHCPDISCOVER
171#define DHCP_MAXTYPE DHCPINFORM
172
173struct dhcp_optflag {
174 uint8_t flags;
175 uint8_t code;
176};
177
178struct option_set {
179 uint8_t *data;
180 struct option_set *next;
181};
182
183extern const struct dhcp_optflag dhcp_optflags[];
184extern const char dhcp_option_strings[];
185extern const uint8_t dhcp_option_lengths[];
186
187unsigned FAST_FUNC udhcp_option_idx(const char *name);
188
189uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
190int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
191void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
192void udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) FAST_FUNC;
193#if ENABLE_FEATURE_UDHCP_RFC3397
194char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
195uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
196#endif
197struct option_set *udhcp_find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
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248#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
249extern unsigned dhcp_verbose;
250# define log1(...) do { if (dhcp_verbose >= 1) bb_info_msg(__VA_ARGS__); } while (0)
251# if CONFIG_UDHCP_DEBUG >= 2
252void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
253# define log2(...) do { if (dhcp_verbose >= 2) bb_info_msg(__VA_ARGS__); } while (0)
254# else
255# define udhcp_dump_packet(...) ((void)0)
256# define log2(...) ((void)0)
257# endif
258# if CONFIG_UDHCP_DEBUG >= 3
259# define log3(...) do { if (dhcp_verbose >= 3) bb_info_msg(__VA_ARGS__); } while (0)
260# else
261# define log3(...) ((void)0)
262# endif
263#else
264# define udhcp_dump_packet(...) ((void)0)
265# define log1(...) ((void)0)
266# define log2(...) ((void)0)
267# define log3(...) ((void)0)
268#endif
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274int FAST_FUNC udhcp_str2nip(const char *str, void *arg);
275
276int FAST_FUNC udhcp_str2optset(const char *str, void *arg);
277
278uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
279
280void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
281
282int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
283
284int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
285 uint32_t source_nip, int source_port,
286 uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
287 int ifindex) FAST_FUNC;
288
289int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
290 uint32_t source_nip, int source_port,
291 uint32_t dest_nip, int dest_port) FAST_FUNC;
292
293void udhcp_sp_setup(void) FAST_FUNC;
294int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
295int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
296
297int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
298
299int udhcp_listen_socket( int port, const char *inf) FAST_FUNC;
300
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302int arpping(uint32_t test_nip,
303 const uint8_t *safe_mac,
304 uint32_t from_ip,
305 uint8_t *from_mac,
306 const char *interface) FAST_FUNC;
307
308POP_SAVED_FUNCTION_VISIBILITY
309
310#endif
311
