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8#ifndef UDHCP_COMMON_H
9#define UDHCP_COMMON_H 1
10
11#include "libbb.h"
12#include "common_bufsiz.h"
13#include <netinet/udp.h>
14#include <netinet/ip.h>
15
16PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
17
18extern const uint8_t MAC_BCAST_ADDR[6] ALIGN2;
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23
24#define DHCP_MAGIC 0x63825363
25#define DHCP_OPTIONS_BUFSIZE 308
26#define BOOTREQUEST 1
27#define BOOTREPLY 2
28
29
30struct dhcp_packet {
31 uint8_t op;
32 uint8_t htype;
33 uint8_t hlen;
34 uint8_t hops;
35 uint32_t xid;
36 uint16_t secs;
37 uint16_t flags;
38#define BROADCAST_FLAG 0x8000
39 uint32_t ciaddr;
40 uint32_t yiaddr;
41
42
43 uint32_t siaddr_nip;
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48
49 uint32_t gateway_nip;
50 uint8_t chaddr[16];
51 uint8_t sname[64];
52
53
54
55 uint8_t file[128];
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60
61 uint32_t cookie;
62 uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
63};
64#define DHCP_PKT_SNAME_LEN 64
65#define DHCP_PKT_FILE_LEN 128
66#define DHCP_PKT_SNAME_LEN_STR "64"
67#define DHCP_PKT_FILE_LEN_STR "128"
68
69struct ip_udp_dhcp_packet {
70 struct iphdr ip;
71 struct udphdr udp;
72 struct dhcp_packet data;
73};
74
75struct udp_dhcp_packet {
76 struct udphdr udp;
77 struct dhcp_packet data;
78};
79
80enum {
81 IP_UDP_DHCP_SIZE = sizeof(struct ip_udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
82 UDP_DHCP_SIZE = sizeof(struct udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
83 DHCP_SIZE = sizeof(struct dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
84};
85
86
87struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
88 char c[IP_UDP_DHCP_SIZE == 576 ? 1 : -1];
89};
90
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92
93
94enum {
95 OPTION_IP = 0,
96 OPTION_IP_PAIR,
97 OPTION_STRING,
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100 OPTION_STRING_HOST,
101
102 OPTION_U8,
103 OPTION_U16,
104
105 OPTION_U32,
106 OPTION_S32,
107 OPTION_BIN,
108 OPTION_STATIC_ROUTES,
109 OPTION_6RD,
110#if ENABLE_FEATURE_UDHCP_RFC3397 || ENABLE_FEATURE_UDHCPC6_RFC3646 || ENABLE_FEATURE_UDHCPC6_RFC4704
111 OPTION_DNS_STRING,
112#endif
113#if ENABLE_FEATURE_UDHCP_RFC3397
114 OPTION_SIP_SERVERS,
115#endif
116
117 OPTION_TYPE_MASK = 0x0f,
118
119 OPTION_REQ = 0x10,
120
121 OPTION_LIST = 0x20,
122};
123
124struct dhcp_scan_state {
125 int overload;
126 int rem;
127 uint8_t *optionptr;
128};
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134
135#define DHCP_PADDING 0x00
136#define DHCP_SUBNET 0x01
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145#define DHCP_HOST_NAME 0x0c
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158#define DHCP_REQUESTED_IP 0x32
159#define DHCP_LEASE_TIME 0x33
160#define DHCP_OPTION_OVERLOAD 0x34
161#define DHCP_MESSAGE_TYPE 0x35
162#define DHCP_SERVER_ID 0x36
163#define DHCP_PARAM_REQ 0x37
164
165#define DHCP_MAX_SIZE 0x39
166
167
168#define DHCP_VENDOR 0x3c
169#define DHCP_CLIENT_ID 0x3d
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174#define DHCP_FQDN 0x51
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187#define DHCP_END 0xff
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189
190#define OPT_CODE 0
191#define OPT_LEN 1
192#define OPT_DATA 2
193
194#define D6_OPT_CODE 0
195#define D6_OPT_LEN 2
196#define D6_OPT_DATA 4
197
198#define OPTION_FIELD 0
199#define FILE_FIELD 1
200#define SNAME_FIELD 2
201
202
203#define DHCPDISCOVER 1
204#define DHCPOFFER 2
205#define DHCPREQUEST 3
206#define DHCPDECLINE 4
207#define DHCPACK 5
208#define DHCPNAK 6
209#define DHCPRELEASE 7
210#define DHCPINFORM 8
211#define DHCP_MINTYPE DHCPDISCOVER
212#define DHCP_MAXTYPE DHCPINFORM
213
214struct dhcp_optflag {
215 uint8_t flags;
216 uint8_t code;
217};
218
219struct option_set {
220 uint8_t *data;
221 struct option_set *next;
222};
223
224#if ENABLE_UDHCPC || ENABLE_UDHCPD
225extern const struct dhcp_optflag dhcp_optflags[];
226extern const char dhcp_option_strings[] ALIGN1;
227#endif
228extern const uint8_t dhcp_option_lengths[] ALIGN1;
229
230unsigned FAST_FUNC udhcp_option_idx(const char *name, const char *option_strings);
231
232void init_scan_state(struct dhcp_packet *packet, struct dhcp_scan_state *scan_state) FAST_FUNC;
233uint8_t *udhcp_scan_options(struct dhcp_packet *packet, struct dhcp_scan_state *scan_state) FAST_FUNC;
234uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
235
236
237
238uint8_t *udhcp_get_option32(struct dhcp_packet *packet, int code) FAST_FUNC;
239int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
240void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
241#if ENABLE_UDHCPC || ENABLE_UDHCPD
242void udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) FAST_FUNC;
243#endif
244#if ENABLE_FEATURE_UDHCP_RFC3397 || ENABLE_FEATURE_UDHCPC6_RFC3646 || ENABLE_FEATURE_UDHCPC6_RFC4704
245char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
246uint8_t *dname_enc( const char *src, int *retlen) FAST_FUNC;
247#endif
248#if !ENABLE_UDHCPC6
249#define udhcp_find_option(opt_list, code, dhcpv6) \
250 udhcp_find_option(opt_list, code)
251#endif
252struct option_set *udhcp_find_option(struct option_set *opt_list, uint8_t code, bool dhcpv6) FAST_FUNC;
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295#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
296# define IF_UDHCP_VERBOSE(...) __VA_ARGS__
297extern unsigned dhcp_verbose;
298# define log1(...) do { if (dhcp_verbose >= 1) bb_info_msg(__VA_ARGS__); } while (0)
299
300void log1s(const char *msg) FAST_FUNC;
301# if CONFIG_UDHCP_DEBUG >= 2
302void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
303# define log2(...) do { if (dhcp_verbose >= 2) bb_info_msg(__VA_ARGS__); } while (0)
304# define log2s(msg) do { if (dhcp_verbose >= 2) bb_simple_info_msg(msg); } while (0)
305# else
306# define udhcp_dump_packet(...) ((void)0)
307# define log2(...) ((void)0)
308# define log2s(msg) ((void)0)
309# endif
310# if CONFIG_UDHCP_DEBUG >= 3
311# define log3(...) do { if (dhcp_verbose >= 3) bb_info_msg(__VA_ARGS__); } while (0)
312# define log3s(msg) do { if (dhcp_verbose >= 3) bb_simple_info_msg(msg); } while (0)
313# else
314# define log3(...) ((void)0)
315# define log3s(msg) ((void)0)
316# endif
317#else
318# define IF_UDHCP_VERBOSE(...)
319# define udhcp_dump_packet(...) ((void)0)
320# define log1(...) ((void)0)
321# define log1s(msg) ((void)0)
322# define log2(...) ((void)0)
323# define log2s(msg) ((void)0)
324# define log3(...) ((void)0)
325# define log3s(msg) ((void)0)
326#endif
327
328
329
330
331int FAST_FUNC udhcp_str2nip(const char *str, void *arg);
332
333#if !ENABLE_UDHCPC6
334#define udhcp_insert_new_option(opt_list, code, length, dhcpv6) \
335 udhcp_insert_new_option(opt_list, code, length)
336#endif
337void* FAST_FUNC udhcp_insert_new_option(struct option_set **opt_list,
338 unsigned code,
339 unsigned length,
340 bool dhcpv6);
341
342
343#if !ENABLE_UDHCPC6
344#define udhcp_str2optset(str, arg, optflags, option_strings, dhcpv6) \
345 udhcp_str2optset(str, arg, optflags, option_strings)
346#endif
347int FAST_FUNC udhcp_str2optset(const char *str,
348 void *arg,
349 const struct dhcp_optflag *optflags,
350 const char *option_strings,
351 bool dhcpv6);
352
353#if ENABLE_UDHCPC || ENABLE_UDHCPD
354void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
355#endif
356
357int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
358
359int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
360 uint32_t source_nip, int source_port,
361 uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
362 int ifindex) FAST_FUNC;
363
364int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
365 uint32_t source_nip, int source_port,
366 uint32_t dest_nip, int dest_port,
367 const char *ifname) FAST_FUNC;
368
369void udhcp_sp_setup(void) FAST_FUNC;
370void udhcp_sp_fd_set(struct pollfd *pfds, int extra_fd) FAST_FUNC;
371int udhcp_sp_read(void) FAST_FUNC;
372
373int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
374
375int udhcp_listen_socket( int port, const char *inf) FAST_FUNC;
376
377
378int arpping(uint32_t test_nip,
379 const uint8_t *safe_mac,
380 uint32_t from_ip,
381 uint8_t *from_mac,
382 const char *interface,
383 unsigned timeo) FAST_FUNC;
384
385
386int sprint_nip6(char *dest, const uint8_t *ip) FAST_FUNC;
387
388POP_SAVED_FUNCTION_VISIBILITY
389
390#endif
391
