a240aa163b9ea18a0541d52af6f0a37f5e482a07
[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 <stdbool.h>
20 #include <syslog.h>
21
22 #include <libubox/blobmsg.h>
23
24 #ifndef typeof
25 #define typeof __typeof
26 #endif
27
28 #ifndef container_of
29 #define container_of(ptr, type, member) ( \
30 (type *)( (char *)ptr - offsetof(type,member) ))
31 #endif
32
33 #include <libubox/list.h>
34 #include <libubox/uloop.h>
35
36 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
37
38 // RFC 6106 defines this router advertisement option
39 #define ND_OPT_ROUTE_INFO 24
40 #define ND_OPT_RECURSIVE_DNS 25
41 #define ND_OPT_DNS_SEARCH 31
42
43 #define INFINITE_VALID(x) ((x) == 0)
44
45 #define _unused __attribute__((unused))
46 #define _packed __attribute__((packed))
47
48
49 #define ALL_IPV6_NODES {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}}}
51
52 #define ALL_IPV6_ROUTERS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
53 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}}}
54
55 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
56
57 struct interface;
58 struct nl_sock;
59 extern struct list_head leases;
60
61 struct odhcpd_event {
62 struct uloop_fd uloop;
63 void (*handle_dgram)(void *addr, void *data, size_t len,
64 struct interface *iface, void *dest_addr);
65 void (*handle_error)(struct odhcpd_event *e, int error);
66 void (*recv_msgs)(struct odhcpd_event *e);
67 };
68
69 union if_addr {
70 struct in_addr in;
71 struct in6_addr in6;
72 };
73
74 struct odhcpd_ipaddr {
75 union if_addr addr;
76 uint8_t prefix;
77 uint32_t preferred;
78 uint32_t valid;
79
80 /* ipv6 only */
81 uint8_t dprefix;
82
83 /* ipv4 only */
84 struct in_addr broadcast;
85 };
86
87 enum odhcpd_mode {
88 MODE_DISABLED,
89 MODE_SERVER,
90 MODE_RELAY,
91 MODE_HYBRID
92 };
93
94
95 enum odhcpd_assignment_flags {
96 OAF_BOUND = (1 << 0),
97 OAF_STATIC = (1 << 1),
98 };
99
100 struct config {
101 bool legacy;
102 bool main_dhcpv4;
103 char *dhcp_cb;
104 char *dhcp_statefile;
105 int log_level;
106 } config;
107
108
109 struct lease {
110 struct list_head head;
111 struct in_addr ipaddr;
112 uint32_t hostid;
113 struct ether_addr mac;
114 uint16_t duid_len;
115 uint8_t *duid;
116 uint32_t dhcpv4_leasetime;
117 char hostname[];
118 };
119
120
121 struct interface {
122 struct list_head head;
123
124 int ifindex;
125 char *ifname;
126 const char *name;
127
128 // Runtime data
129 struct uloop_timeout timer_rs;
130 struct list_head ia_assignments;
131 struct odhcpd_ipaddr *addr4;
132 size_t addr4_len;
133 struct odhcpd_ipaddr *ia_addr;
134 size_t ia_addr_len;
135
136 // DHCPv4
137 struct odhcpd_event dhcpv6_event;
138 struct odhcpd_event dhcpv4_event;
139 struct odhcpd_event ndp_event;
140 struct list_head dhcpv4_assignments;
141
142 // Managed PD
143 char dhcpv6_pd_manager[128];
144 struct in6_addr dhcpv6_pd_cer;
145
146 // Services
147 enum odhcpd_mode ra;
148 enum odhcpd_mode dhcpv6;
149 enum odhcpd_mode ndp;
150 enum odhcpd_mode dhcpv4;
151
152 // Config
153 bool inuse;
154 bool external;
155 bool master;
156 bool ignore;
157 bool always_rewrite_dns;
158 bool ra_not_onlink;
159 bool ra_advrouter;
160 bool ra_useleasetime;
161 bool no_dynamic_dhcp;
162
163 // RA
164 int learn_routes;
165 int default_router;
166 int ra_managed;
167 int route_preference;
168 int ra_maxinterval;
169 int ra_mininterval;
170 int ra_lifetime;
171 uint32_t ra_reachabletime;
172 uint32_t ra_retranstime;
173 uint32_t ra_hoplimit;
174 int ra_mtu;
175
176 // DHCPv4
177 struct in_addr dhcpv4_start;
178 struct in_addr dhcpv4_end;
179 struct in_addr *dhcpv4_router;
180 size_t dhcpv4_router_cnt;
181 struct in_addr *dhcpv4_dns;
182 size_t dhcpv4_dns_cnt;
183 uint32_t dhcpv4_leasetime;
184
185 // DNS
186 struct in6_addr *dns;
187 size_t dns_cnt;
188 uint8_t *search;
189 size_t search_len;
190
191 // DHCPV6
192 void *dhcpv6_raw;
193 size_t dhcpv6_raw_len;
194 bool dhcpv6_assignall;
195
196 char *upstream;
197 size_t upstream_len;
198
199 char *filter_class;
200 };
201
202 extern struct list_head interfaces;
203
204 #define RA_MANAGED_NO_MFLAG 0
205 #define RA_MANAGED_MFLAG 1
206 #define RA_MANAGED_NO_AFLAG 2
207
208
209 // Exported main functions
210 int odhcpd_register(struct odhcpd_event *event);
211 int odhcpd_deregister(struct odhcpd_event *event);
212 void odhcpd_process(struct odhcpd_event *event);
213
214 struct nl_sock *odhcpd_create_nl_socket(int protocol);
215 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
216 struct iovec *iov, size_t iov_len,
217 const struct interface *iface);
218 ssize_t odhcpd_get_interface_addresses(int ifindex, bool v6,
219 struct odhcpd_ipaddr **addrs);
220 int odhcpd_get_interface_dns_addr(const struct interface *iface,
221 struct in6_addr *addr);
222 struct interface* odhcpd_get_interface_by_name(const char *name);
223 int odhcpd_get_interface_config(const char *ifname, const char *what);
224 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
225 struct interface* odhcpd_get_interface_by_index(int ifindex);
226 struct interface* odhcpd_get_master_interface(void);
227 int odhcpd_urandom(void *data, size_t len);
228 int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen,
229 const struct interface *iface, const struct in6_addr *gw,
230 const uint32_t metric, const bool add);
231 int odhcpd_setup_proxy_neigh(const struct in6_addr *addr,
232 const struct interface *iface, const bool add);
233
234 void odhcpd_run(void);
235 time_t odhcpd_time(void);
236 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
237 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
238
239 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
240 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
241
242 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
243
244 #ifdef WITH_UBUS
245 int init_ubus(void);
246 const char* ubus_get_ifname(const char *name);
247 void ubus_apply_network(void);
248 bool ubus_has_prefix(const char *name, const char *ifname);
249 #endif
250
251
252 // Exported module initializers
253 int init_router(void);
254 int init_dhcpv6(void);
255 int init_dhcpv4(void);
256 int init_ndp(void);
257
258 int setup_router_interface(struct interface *iface, bool enable);
259 int setup_dhcpv6_interface(struct interface *iface, bool enable);
260 int setup_ndp_interface(struct interface *iface, bool enable);
261 int setup_dhcpv4_interface(struct interface *iface, bool enable);
262
263 void odhcpd_reload(void);