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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] ALIGN2;
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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,
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85 OPTION_STRING_HOST,
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87 OPTION_U8,
88 OPTION_U16,
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90 OPTION_U32,
91 OPTION_S32,
92 OPTION_BIN,
93 OPTION_STATIC_ROUTES,
94 OPTION_6RD,
95#if ENABLE_FEATURE_UDHCP_RFC3397
96 OPTION_DNS_STRING,
97 OPTION_SIP_SERVERS,
98#endif
99
100 OPTION_TYPE_MASK = 0x0f,
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102 OPTION_REQ = 0x10,
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104 OPTION_LIST = 0x20,
105};
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112#define DHCP_PADDING 0x00
113#define DHCP_SUBNET 0x01
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122#define DHCP_HOST_NAME 0x0c
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135#define DHCP_REQUESTED_IP 0x32
136#define DHCP_LEASE_TIME 0x33
137#define DHCP_OPTION_OVERLOAD 0x34
138#define DHCP_MESSAGE_TYPE 0x35
139#define DHCP_SERVER_ID 0x36
140#define DHCP_PARAM_REQ 0x37
141
142#define DHCP_MAX_SIZE 0x39
143#define DHCP_VENDOR 0x3c
144#define DHCP_CLIENT_ID 0x3d
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147
148#define DHCP_FQDN 0x51
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158#define DHCP_END 0xff
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161#define OPT_CODE 0
162#define OPT_LEN 1
163#define OPT_DATA 2
164
165#define OPTION_FIELD 0
166#define FILE_FIELD 1
167#define SNAME_FIELD 2
168
169
170#define DHCPDISCOVER 1
171#define DHCPOFFER 2
172#define DHCPREQUEST 3
173#define DHCPDECLINE 4
174#define DHCPACK 5
175#define DHCPNAK 6
176#define DHCPRELEASE 7
177#define DHCPINFORM 8
178#define DHCP_MINTYPE DHCPDISCOVER
179#define DHCP_MAXTYPE DHCPINFORM
180
181struct dhcp_optflag {
182 uint8_t flags;
183 uint8_t code;
184};
185
186struct option_set {
187 uint8_t *data;
188 struct option_set *next;
189};
190
191extern const struct dhcp_optflag dhcp_optflags[];
192extern const char dhcp_option_strings[] ALIGN1;
193extern const uint8_t dhcp_option_lengths[] ALIGN1;
194
195unsigned FAST_FUNC udhcp_option_idx(const char *name);
196
197uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
198int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
199void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
200void udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) FAST_FUNC;
201#if ENABLE_FEATURE_UDHCP_RFC3397
202char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
203uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
204#endif
205struct option_set *udhcp_find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
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256#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
257# define IF_UDHCP_VERBOSE(...) __VA_ARGS__
258extern unsigned dhcp_verbose;
259# define log1(...) do { if (dhcp_verbose >= 1) bb_info_msg(__VA_ARGS__); } while (0)
260# if CONFIG_UDHCP_DEBUG >= 2
261void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
262# define log2(...) do { if (dhcp_verbose >= 2) bb_info_msg(__VA_ARGS__); } while (0)
263# else
264# define udhcp_dump_packet(...) ((void)0)
265# define log2(...) ((void)0)
266# endif
267# if CONFIG_UDHCP_DEBUG >= 3
268# define log3(...) do { if (dhcp_verbose >= 3) bb_info_msg(__VA_ARGS__); } while (0)
269# else
270# define log3(...) ((void)0)
271# endif
272#else
273# define IF_UDHCP_VERBOSE(...)
274# define udhcp_dump_packet(...) ((void)0)
275# define log1(...) ((void)0)
276# define log2(...) ((void)0)
277# define log3(...) ((void)0)
278#endif
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284int FAST_FUNC udhcp_str2nip(const char *str, void *arg);
285
286int FAST_FUNC udhcp_str2optset(const char *str, void *arg);
287
288void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
289
290int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
291
292int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
293 uint32_t source_nip, int source_port,
294 uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
295 int ifindex) FAST_FUNC;
296
297int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
298 uint32_t source_nip, int source_port,
299 uint32_t dest_nip, int dest_port) FAST_FUNC;
300
301void udhcp_sp_setup(void) FAST_FUNC;
302int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
303int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
304
305int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
306
307int udhcp_listen_socket( int port, const char *inf) FAST_FUNC;
308
309
310int arpping(uint32_t test_nip,
311 const uint8_t *safe_mac,
312 uint32_t from_ip,
313 uint8_t *from_mac,
314 const char *interface,
315 unsigned timeo) FAST_FUNC;
316
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318int sprint_nip6(char *dest, const uint8_t *ip) FAST_FUNC;
319
320POP_SAVED_FUNCTION_VISIBILITY
321
322#endif
323
