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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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79enum {
80 OPTION_IP = 1,
81 OPTION_IP_PAIR,
82 OPTION_STRING,
83
84 OPTION_U8,
85 OPTION_U16,
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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,
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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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148#define DHCP_VLAN_ID 0x84
149#define DHCP_VLAN_PRIORITY 0x85
150
151
152#define DHCP_END 0xff
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154
155#define OPT_CODE 0
156#define OPT_LEN 1
157#define OPT_DATA 2
158
159#define OPTION_FIELD 0
160#define FILE_FIELD 1
161#define SNAME_FIELD 2
162
163
164#define DHCPDISCOVER 1
165#define DHCPOFFER 2
166#define DHCPREQUEST 3
167#define DHCPDECLINE 4
168#define DHCPACK 5
169#define DHCPNAK 6
170#define DHCPRELEASE 7
171#define DHCPINFORM 8
172#define DHCP_MINTYPE DHCPDISCOVER
173#define DHCP_MAXTYPE DHCPINFORM
174
175struct dhcp_optflag {
176 uint8_t flags;
177 uint8_t code;
178};
179
180struct option_set {
181 uint8_t *data;
182 struct option_set *next;
183};
184
185extern const struct dhcp_optflag dhcp_optflags[];
186extern const char dhcp_option_strings[];
187extern const uint8_t dhcp_option_lengths[];
188
189unsigned FAST_FUNC udhcp_option_idx(const char *name);
190
191uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
192int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
193void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
194void udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) FAST_FUNC;
195#if ENABLE_FEATURE_UDHCP_RFC3397
196char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
197uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
198#endif
199struct option_set *udhcp_find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
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250#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
251extern unsigned dhcp_verbose;
252# define log1(...) do { if (dhcp_verbose >= 1) bb_info_msg(__VA_ARGS__); } while (0)
253# if CONFIG_UDHCP_DEBUG >= 2
254void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
255# define log2(...) do { if (dhcp_verbose >= 2) bb_info_msg(__VA_ARGS__); } while (0)
256# else
257# define udhcp_dump_packet(...) ((void)0)
258# define log2(...) ((void)0)
259# endif
260# if CONFIG_UDHCP_DEBUG >= 3
261# define log3(...) do { if (dhcp_verbose >= 3) bb_info_msg(__VA_ARGS__); } while (0)
262# else
263# define log3(...) ((void)0)
264# endif
265#else
266# define udhcp_dump_packet(...) ((void)0)
267# define log1(...) ((void)0)
268# define log2(...) ((void)0)
269# define log3(...) ((void)0)
270#endif
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276int FAST_FUNC udhcp_str2nip(const char *str, void *arg);
277
278int FAST_FUNC udhcp_str2optset(const char *str, void *arg);
279
280uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
281
282void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
283
284int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
285
286int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
287 uint32_t source_nip, int source_port,
288 uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
289 int ifindex) FAST_FUNC;
290
291int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
292 uint32_t source_nip, int source_port,
293 uint32_t dest_nip, int dest_port) FAST_FUNC;
294
295void udhcp_sp_setup(void) FAST_FUNC;
296int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
297int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
298
299int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
300
301int udhcp_listen_socket( int port, const char *inf) FAST_FUNC;
302
303
304int arpping(uint32_t test_nip,
305 const uint8_t *safe_mac,
306 uint32_t from_ip,
307 uint8_t *from_mac,
308 const char *interface) FAST_FUNC;
309
310POP_SAVED_FUNCTION_VISIBILITY
311
312#endif
313
