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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 uint32_t siaddr_nip;
43 uint32_t gateway_nip;
44 uint8_t chaddr[16];
45 uint8_t sname[64];
46 uint8_t file[128];
47 uint32_t cookie;
48 uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
49} PACKED;
50#define DHCP_PKT_SNAME_LEN 64
51#define DHCP_PKT_FILE_LEN 128
52#define DHCP_PKT_SNAME_LEN_STR "64"
53#define DHCP_PKT_FILE_LEN_STR "128"
54
55struct ip_udp_dhcp_packet {
56 struct iphdr ip;
57 struct udphdr udp;
58 struct dhcp_packet data;
59} PACKED;
60
61struct udp_dhcp_packet {
62 struct udphdr udp;
63 struct dhcp_packet data;
64} PACKED;
65
66enum {
67 IP_UDP_DHCP_SIZE = sizeof(struct ip_udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
68 UDP_DHCP_SIZE = sizeof(struct udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
69 DHCP_SIZE = sizeof(struct dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
70};
71
72
73struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
74 char c[IP_UDP_DHCP_SIZE == 576 ? 1 : -1];
75};
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80enum {
81 OPTION_IP = 1,
82 OPTION_IP_PAIR,
83 OPTION_STRING,
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86 OPTION_STRING_HOST,
87
88 OPTION_U8,
89 OPTION_U16,
90
91 OPTION_U32,
92 OPTION_S32,
93 OPTION_BIN,
94 OPTION_STATIC_ROUTES,
95 OPTION_6RD,
96#if ENABLE_FEATURE_UDHCP_RFC3397 || ENABLE_FEATURE_UDHCPC6_RFC3646 || ENABLE_FEATURE_UDHCPC6_RFC4704
97 OPTION_DNS_STRING,
98#endif
99#if ENABLE_FEATURE_UDHCP_RFC3397
100 OPTION_SIP_SERVERS,
101#endif
102
103 OPTION_TYPE_MASK = 0x0f,
104
105 OPTION_REQ = 0x10,
106
107 OPTION_LIST = 0x20,
108};
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115#define DHCP_PADDING 0x00
116#define DHCP_SUBNET 0x01
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125#define DHCP_HOST_NAME 0x0c
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138#define DHCP_REQUESTED_IP 0x32
139#define DHCP_LEASE_TIME 0x33
140#define DHCP_OPTION_OVERLOAD 0x34
141#define DHCP_MESSAGE_TYPE 0x35
142#define DHCP_SERVER_ID 0x36
143#define DHCP_PARAM_REQ 0x37
144
145#define DHCP_MAX_SIZE 0x39
146#define DHCP_VENDOR 0x3c
147#define DHCP_CLIENT_ID 0x3d
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151#define DHCP_FQDN 0x51
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164#define DHCP_END 0xff
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166
167#define OPT_CODE 0
168#define OPT_LEN 1
169#define OPT_DATA 2
170
171#define D6_OPT_CODE 0
172#define D6_OPT_LEN 2
173#define D6_OPT_DATA 4
174
175#define OPTION_FIELD 0
176#define FILE_FIELD 1
177#define SNAME_FIELD 2
178
179
180#define DHCPDISCOVER 1
181#define DHCPOFFER 2
182#define DHCPREQUEST 3
183#define DHCPDECLINE 4
184#define DHCPACK 5
185#define DHCPNAK 6
186#define DHCPRELEASE 7
187#define DHCPINFORM 8
188#define DHCP_MINTYPE DHCPDISCOVER
189#define DHCP_MAXTYPE DHCPINFORM
190
191struct dhcp_optflag {
192 uint8_t flags;
193 uint8_t code;
194};
195
196struct option_set {
197 uint8_t *data;
198 struct option_set *next;
199};
200
201#if ENABLE_UDHCPC || ENABLE_UDHCPD
202extern const struct dhcp_optflag dhcp_optflags[];
203extern const char dhcp_option_strings[] ALIGN1;
204#endif
205extern const uint8_t dhcp_option_lengths[] ALIGN1;
206
207unsigned FAST_FUNC udhcp_option_idx(const char *name, const char *option_strings);
208
209uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
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213uint8_t *udhcp_get_option32(struct dhcp_packet *packet, int code) FAST_FUNC;
214int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
215void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
216#if ENABLE_UDHCPC || ENABLE_UDHCPD
217void udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) FAST_FUNC;
218#endif
219#if ENABLE_FEATURE_UDHCP_RFC3397 || ENABLE_FEATURE_UDHCPC6_RFC3646 || ENABLE_FEATURE_UDHCPC6_RFC4704
220char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
221uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
222#endif
223struct option_set *udhcp_find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
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266#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
267# define IF_UDHCP_VERBOSE(...) __VA_ARGS__
268extern unsigned dhcp_verbose;
269# define log1(...) do { if (dhcp_verbose >= 1) bb_info_msg(__VA_ARGS__); } while (0)
270# if CONFIG_UDHCP_DEBUG >= 2
271void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
272# define log2(...) do { if (dhcp_verbose >= 2) bb_info_msg(__VA_ARGS__); } while (0)
273# else
274# define udhcp_dump_packet(...) ((void)0)
275# define log2(...) ((void)0)
276# endif
277# if CONFIG_UDHCP_DEBUG >= 3
278# define log3(...) do { if (dhcp_verbose >= 3) bb_info_msg(__VA_ARGS__); } while (0)
279# else
280# define log3(...) ((void)0)
281# endif
282#else
283# define IF_UDHCP_VERBOSE(...)
284# define udhcp_dump_packet(...) ((void)0)
285# define log1(...) ((void)0)
286# define log2(...) ((void)0)
287# define log3(...) ((void)0)
288#endif
289
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293
294int FAST_FUNC udhcp_str2nip(const char *str, void *arg);
295
296#if !ENABLE_UDHCPC6
297#define udhcp_str2optset(str, arg, optflags, option_strings, dhcpv6) \
298 udhcp_str2optset(str, arg, optflags, option_strings)
299#endif
300int FAST_FUNC udhcp_str2optset(const char *str,
301 void *arg,
302 const struct dhcp_optflag *optflags,
303 const char *option_strings,
304 bool dhcpv6);
305
306#if ENABLE_UDHCPC || ENABLE_UDHCPD
307void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
308#endif
309
310int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
311
312int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
313 uint32_t source_nip, int source_port,
314 uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
315 int ifindex) FAST_FUNC;
316
317int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
318 uint32_t source_nip, int source_port,
319 uint32_t dest_nip, int dest_port) FAST_FUNC;
320
321void udhcp_sp_setup(void) FAST_FUNC;
322void udhcp_sp_fd_set(struct pollfd *pfds, int extra_fd) FAST_FUNC;
323int udhcp_sp_read(void) FAST_FUNC;
324
325int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
326
327int udhcp_listen_socket( int port, const char *inf) FAST_FUNC;
328
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330int arpping(uint32_t test_nip,
331 const uint8_t *safe_mac,
332 uint32_t from_ip,
333 uint8_t *from_mac,
334 const char *interface,
335 unsigned timeo) FAST_FUNC;
336
337
338int sprint_nip6(char *dest, const uint8_t *ip) FAST_FUNC;
339
340POP_SAVED_FUNCTION_VISIBILITY
341
342#endif
343
