2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
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.
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.
16 #include <netinet/in.h>
17 #include <netinet/icmp6.h>
18 #include <netinet/ether.h>
22 #include <libubox/blobmsg.h>
23 #include <libubox/list.h>
24 #include <libubox/uloop.h>
25 #include <libubox/avl.h>
26 #include <libubox/ustream.h>
28 // RFC 6106 defines this router advertisement option
29 #define ND_OPT_ROUTE_INFO 24
30 #define ND_OPT_RECURSIVE_DNS 25
31 #define ND_OPT_DNS_SEARCH 31
33 #define INFINITE_VALID(x) ((x) == 0)
35 #define _unused __attribute__((unused))
36 #define _packed __attribute__((packed))
38 #define ALL_IPV6_NODES "ff02::1"
39 #define ALL_IPV6_ROUTERS "ff02::2"
41 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
45 extern struct list_head leases;
48 struct uloop_fd uloop;
49 void (*handle_dgram)(void *addr, void *data, size_t len,
50 struct interface *iface, void *dest_addr);
51 void (*handle_error)(struct odhcpd_event *e, int error);
52 void (*recv_msgs)(struct odhcpd_event *e);
60 struct netevent_handler_info {
61 struct interface *iface;
66 union if_addr gateway;
74 struct odhcpd_ipaddr *addrs;
85 NETEV_ADDRLIST_CHANGE,
88 NETEV_ADDR6LIST_CHANGE,
95 struct netevent_handler {
96 struct list_head head;
97 void (*cb) (unsigned long event, struct netevent_handler_info *info);
100 struct odhcpd_ipaddr {
110 struct in_addr broadcast;
121 enum odhcpd_assignment_flags {
122 OAF_TENTATIVE = (1 << 0),
123 OAF_BOUND = (1 << 1),
124 OAF_STATIC = (1 << 2),
125 OAF_BROKEN_HOSTNAME = (1 << 3),
132 char *dhcp_statefile;
138 struct list_head head;
139 struct in_addr ipaddr;
141 struct ether_addr mac;
144 uint32_t dhcpv4_leasetime;
149 struct odhcpd_ref_ip;
151 struct dhcp_assignment {
152 struct list_head head;
153 struct interface *iface;
155 struct sockaddr_in6 peer;
158 #define fr_timer reconf_timer
159 struct uloop_timeout reconf_timer;
160 #define accept_fr_nonce accept_reconf
162 #define fr_cnt reconf_cnt
165 struct odhcpd_ref_ip *fr_ip;
170 uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
172 struct odhcpd_ipaddr *managed;
173 ssize_t managed_size;
174 struct ustream_fd managed_sock;
195 struct odhcpd_ipaddr *addr6;
199 struct uloop_timeout timer_rs;
201 // DHCPv6 runtime data
202 struct odhcpd_event dhcpv6_event;
203 struct list_head ia_assignments;
206 struct odhcpd_event ndp_event;
209 struct odhcpd_ipaddr *addr4;
212 // DHCPv4 runtime data
213 struct odhcpd_event dhcpv4_event;
214 struct list_head dhcpv4_assignments;
215 struct list_head dhcpv4_fr_ips;
218 char dhcpv6_pd_manager[128];
219 struct in6_addr dhcpv6_pd_cer;
223 enum odhcpd_mode dhcpv6;
224 enum odhcpd_mode ndp;
225 enum odhcpd_mode dhcpv4;
232 bool always_rewrite_dns;
235 bool ra_useleasetime;
237 bool no_dynamic_dhcp;
238 uint8_t pio_filter_length;
239 struct in6_addr pio_filter_addr;
245 int route_preference;
249 uint32_t ra_reachabletime;
250 uint32_t ra_retranstime;
251 uint32_t ra_hoplimit;
255 struct in_addr dhcpv4_start;
256 struct in_addr dhcpv4_end;
257 struct in_addr dhcpv4_start_ip;
258 struct in_addr dhcpv4_end_ip;
259 struct in_addr dhcpv4_local;
260 struct in_addr dhcpv4_bcast;
261 struct in_addr dhcpv4_mask;
262 struct in_addr *dhcpv4_router;
263 size_t dhcpv4_router_cnt;
264 struct in_addr *dhcpv4_dns;
265 size_t dhcpv4_dns_cnt;
266 uint32_t dhcpv4_leasetime;
267 bool dhcpv4_forcereconf;
270 struct in6_addr *dns;
277 size_t dhcpv6_raw_len;
278 bool dhcpv6_assignall;
288 extern struct avl_tree interfaces;
290 #define RA_MANAGED_NO_MFLAG 0
291 #define RA_MANAGED_MFLAG 1
292 #define RA_MANAGED_NO_AFLAG 2
295 // Exported main functions
296 int odhcpd_register(struct odhcpd_event *event);
297 int odhcpd_deregister(struct odhcpd_event *event);
298 void odhcpd_process(struct odhcpd_event *event);
300 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
301 struct iovec *iov, size_t iov_len,
302 const struct interface *iface);
303 int odhcpd_get_interface_dns_addr(const struct interface *iface,
304 struct in6_addr *addr);
305 int odhcpd_get_interface_config(const char *ifname, const char *what);
306 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
307 struct interface* odhcpd_get_interface_by_index(int ifindex);
308 struct interface* odhcpd_get_master_interface(void);
309 int odhcpd_urandom(void *data, size_t len);
311 void odhcpd_run(void);
312 time_t odhcpd_time(void);
313 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
314 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
315 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
317 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
318 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
320 int odhcpd_netmask2bitlen(bool v6, void *mask);
321 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
322 bool odhcpd_valid_hostname(const char *name);
324 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
328 const char* ubus_get_ifname(const char *name);
329 void ubus_apply_network(void);
330 bool ubus_has_prefix(const char *name, const char *ifname);
331 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
332 const struct in_addr *addr, const char *name, const char *interface);
335 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
336 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
337 struct odhcpd_ipaddr **addrs);
338 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
339 const int ifindex, const struct in6_addr *gw,
340 const uint32_t metric, const bool add);
341 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
342 const int ifindex, const bool add);
343 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
344 const int ifindex, const bool v6, const bool add);
345 void netlink_dump_neigh_table(const bool proxy);
346 void netlink_dump_addr_table(const bool v6);
348 // Exported module initializers
349 int netlink_init(void);
350 int router_init(void);
351 int dhcpv6_init(void);
353 #ifdef DHCPV4_SUPPORT
354 int dhcpv4_init(void);
356 int dhcpv4_setup_interface(struct interface *iface, bool enable);
358 int router_setup_interface(struct interface *iface, bool enable);
359 int dhcpv6_setup_interface(struct interface *iface, bool enable);
360 int ndp_setup_interface(struct interface *iface, bool enable);
362 void odhcpd_reload(void);