fb78ec0eee7812ac1fbe557c3e0797c853e19da2
[project/odhcpd.git] / src / odhcpd.h
1 /**
2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 */
14
15 #pragma once
16 #include <netinet/in.h>
17 #include <netinet/icmp6.h>
18 #include <netinet/ether.h>
19 #include <net/if.h>
20 #include <stdbool.h>
21 #include <syslog.h>
22
23 #include "libubox/blobmsg.h"
24
25 #ifndef typeof
26 #define typeof __typeof
27 #endif
28
29 #ifndef container_of
30 #define container_of(ptr, type, member) ( \
31 (type *)( (char *)ptr - offsetof(type,member) ))
32 #endif
33
34 #include "libubox/list.h"
35 #include "libubox/uloop.h"
36
37 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
38
39 // RFC 6106 defines this router advertisement option
40 #define ND_OPT_ROUTE_INFO 24
41 #define ND_OPT_RECURSIVE_DNS 25
42 #define ND_OPT_DNS_SEARCH 31
43
44 #define RELAYD_BUFFER_SIZE 8192
45 #define RELAYD_MAX_PREFIXES 8
46 #define RELAYD_MAX_ADDRS 8
47
48 #define INFINITE_VALID(x) ((x) == 0)
49
50 #define _unused __attribute__((unused))
51 #define _packed __attribute__((packed))
52
53
54 #define ALL_IPV6_NODES {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
55 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}}}
56
57 #define ALL_IPV6_ROUTERS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
58 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}}}
59
60
61 struct interface;
62 struct nl_sock;
63 extern struct list_head leases;
64
65 struct odhcpd_event {
66 struct uloop_fd uloop;
67 void (*handle_dgram)(void *addr, void *data, size_t len,
68 struct interface *iface, void *dest_addr);
69 void (*handle_error)(struct odhcpd_event *e, int error);
70 void (*recv_msgs)(struct odhcpd_event *e);
71 };
72
73
74 struct odhcpd_ipaddr {
75 struct in6_addr addr;
76 uint8_t prefix;
77 uint8_t dprefix;
78 uint32_t preferred;
79 uint32_t valid;
80 };
81
82 enum odhcpd_mode {
83 RELAYD_DISABLED,
84 RELAYD_SERVER,
85 RELAYD_RELAY,
86 RELAYD_HYBRID
87 };
88
89
90 enum odhcpd_assignment_flags {
91 OAF_BOUND = (1 << 0),
92 OAF_STATIC = (1 << 1),
93 };
94
95 struct config {
96 bool legacy;
97 char *dhcp_cb;
98 char *dhcp_statefile;
99 } config;
100
101
102 struct lease {
103 struct list_head head;
104 struct in_addr ipaddr;
105 uint32_t hostid;
106 struct ether_addr mac;
107 uint16_t duid_len;
108 uint8_t *duid;
109 uint32_t dhcpv4_leasetime;
110 char hostname[];
111 };
112
113
114 struct interface {
115 struct list_head head;
116
117 int ifindex;
118 char ifname[IF_NAMESIZE];
119 char name[IF_NAMESIZE];
120
121 // Runtime data
122 struct uloop_timeout timer_rs;
123 struct list_head ia_assignments;
124 struct odhcpd_ipaddr ia_addr[RELAYD_MAX_ADDRS];
125 size_t ia_addr_len;
126
127 // DHCPv4
128 struct odhcpd_event dhcpv6_event;
129 struct odhcpd_event dhcpv4_event;
130 struct odhcpd_event ndp_event;
131 struct list_head dhcpv4_assignments;
132
133 // Managed PD
134 char dhcpv6_pd_manager[128];
135 struct in6_addr dhcpv6_pd_cer;
136
137 // Services
138 enum odhcpd_mode ra;
139 enum odhcpd_mode dhcpv6;
140 enum odhcpd_mode ndp;
141 enum odhcpd_mode dhcpv4;
142
143 // Config
144 bool inuse;
145 bool external;
146 bool master;
147 bool ignore;
148 bool always_rewrite_dns;
149 bool ra_not_onlink;
150 bool ra_advrouter;
151 bool no_dynamic_dhcp;
152
153 int learn_routes;
154 int default_router;
155 int managed;
156 int route_preference;
157 int ra_maxinterval;
158
159 // DHCPv4
160 struct in_addr dhcpv4_start;
161 struct in_addr dhcpv4_end;
162 struct in_addr *dhcpv4_router;
163 size_t dhcpv4_router_cnt;
164 struct in_addr *dhcpv4_dns;
165 size_t dhcpv4_dns_cnt;
166 uint32_t dhcpv4_leasetime;
167
168 // DNS
169 struct in6_addr *dns;
170 size_t dns_cnt;
171 uint8_t *search;
172 size_t search_len;
173
174 void *dhcpv6_raw;
175 size_t dhcpv6_raw_len;
176
177 char *upstream;
178 size_t upstream_len;
179
180 char *filter_class;
181 };
182
183 extern struct list_head interfaces;
184
185 #define RELAYD_MANAGED_MFLAG 1
186 #define RELAYD_MANAGED_NO_AFLAG 2
187
188
189 // Exported main functions
190 int odhcpd_register(struct odhcpd_event *event);
191 int odhcpd_deregister(struct odhcpd_event *event);
192 void odhcpd_process(struct odhcpd_event *event);
193
194 struct nl_sock *odhcpd_create_nl_socket(int protocol);
195 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
196 struct iovec *iov, size_t iov_len,
197 const struct interface *iface);
198 ssize_t odhcpd_get_interface_addresses(int ifindex,
199 struct odhcpd_ipaddr *addrs, size_t cnt);
200 int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr);
201 struct interface* odhcpd_get_interface_by_name(const char *name);
202 int odhcpd_get_interface_config(const char *ifname, const char *what);
203 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
204 struct interface* odhcpd_get_interface_by_index(int ifindex);
205 struct interface* odhcpd_get_master_interface(void);
206 int odhcpd_urandom(void *data, size_t len);
207 int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen,
208 const struct interface *iface, const struct in6_addr *gw,
209 const uint32_t metric, const bool add);
210 int odhcpd_setup_proxy_neigh(const struct in6_addr *addr,
211 const struct interface *iface, const bool add);
212
213 void odhcpd_run(void);
214 time_t odhcpd_time(void);
215 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
216 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
217
218 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
219 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
220
221 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
222
223 #ifdef WITH_UBUS
224 int init_ubus(void);
225 const char* ubus_get_ifname(const char *name);
226 void ubus_apply_network(void);
227 bool ubus_has_prefix(const char *name, const char *ifname);
228 #endif
229
230
231 // Exported module initializers
232 int init_router(void);
233 int init_dhcpv6(void);
234 int init_dhcpv4(void);
235 int init_ndp(void);
236
237 int setup_router_interface(struct interface *iface, bool enable);
238 int setup_dhcpv6_interface(struct interface *iface, bool enable);
239 int setup_ndp_interface(struct interface *iface, bool enable);
240 int setup_dhcpv4_interface(struct interface *iface, bool enable);
241
242 void odhcpd_reload(void);