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>
27 #include <libubox/vlist.h>
29 // RFC 6106 defines this router advertisement option
30 #define ND_OPT_ROUTE_INFO 24
31 #define ND_OPT_RECURSIVE_DNS 25
32 #define ND_OPT_DNS_SEARCH 31
34 #define INFINITE_VALID(x) ((x) == 0)
36 #define _unused __attribute__((unused))
37 #define _packed __attribute__((packed))
39 #define ALL_IPV6_NODES "ff02::1"
40 #define ALL_IPV6_ROUTERS "ff02::2"
42 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
46 extern struct vlist_tree leases;
49 struct uloop_fd uloop;
50 void (*handle_dgram)(void *addr, void *data, size_t len,
51 struct interface *iface, void *dest_addr);
52 void (*handle_error)(struct odhcpd_event *e, int error);
53 void (*recv_msgs)(struct odhcpd_event *e);
56 typedef void (*dhcpv6_binding_cb_handler_t)(struct in6_addr *addr, int prefix,
57 uint32_t pref, uint32_t valid,
65 struct netevent_handler_info {
66 struct interface *iface;
71 union if_addr gateway;
79 struct odhcpd_ipaddr *addrs;
90 NETEV_ADDRLIST_CHANGE,
93 NETEV_ADDR6LIST_CHANGE,
100 struct netevent_handler {
101 struct list_head head;
102 void (*cb) (unsigned long event, struct netevent_handler_info *info);
105 struct odhcpd_ipaddr {
115 struct in_addr broadcast;
126 enum odhcpd_assignment_flags {
127 OAF_TENTATIVE = (1 << 0),
128 OAF_BOUND = (1 << 1),
129 OAF_STATIC = (1 << 2),
130 OAF_BROKEN_HOSTNAME = (1 << 3),
131 OAF_DHCPV4 = (1 << 4),
132 OAF_DHCPV6 = (1 << 5),
139 char *dhcp_statefile;
145 struct vlist_node node;
146 struct list_head assignments;
149 struct ether_addr mac;
157 struct odhcpd_ref_ip;
159 struct dhcp_assignment {
160 struct list_head head;
161 struct list_head lease_list;
163 struct interface *iface;
166 struct sockaddr_in6 peer;
169 #define fr_timer reconf_timer
170 struct uloop_timeout reconf_timer;
171 #define accept_fr_nonce accept_reconf
173 #define fr_cnt reconf_cnt
176 struct odhcpd_ref_ip *fr_ip;
181 uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
183 struct odhcpd_ipaddr *managed;
184 ssize_t managed_size;
185 struct ustream_fd managed_sock;
206 struct odhcpd_ipaddr *addr6;
210 struct uloop_timeout timer_rs;
212 // DHCPv6 runtime data
213 struct odhcpd_event dhcpv6_event;
214 struct list_head ia_assignments;
217 struct odhcpd_event ndp_event;
220 struct odhcpd_ipaddr *addr4;
223 // DHCPv4 runtime data
224 struct odhcpd_event dhcpv4_event;
225 struct list_head dhcpv4_assignments;
226 struct list_head dhcpv4_fr_ips;
229 char dhcpv6_pd_manager[128];
230 struct in6_addr dhcpv6_pd_cer;
234 enum odhcpd_mode dhcpv6;
235 enum odhcpd_mode ndp;
236 enum odhcpd_mode dhcpv4;
243 bool always_rewrite_dns;
246 bool ra_useleasetime;
248 bool no_dynamic_dhcp;
249 uint8_t pio_filter_length;
250 struct in6_addr pio_filter_addr;
256 int route_preference;
260 uint32_t ra_reachabletime;
261 uint32_t ra_retranstime;
262 uint32_t ra_hoplimit;
266 struct in_addr dhcpv4_start;
267 struct in_addr dhcpv4_end;
268 struct in_addr dhcpv4_start_ip;
269 struct in_addr dhcpv4_end_ip;
270 struct in_addr dhcpv4_local;
271 struct in_addr dhcpv4_bcast;
272 struct in_addr dhcpv4_mask;
273 struct in_addr *dhcpv4_router;
274 size_t dhcpv4_router_cnt;
275 struct in_addr *dhcpv4_dns;
276 size_t dhcpv4_dns_cnt;
277 uint32_t dhcpv4_leasetime;
278 bool dhcpv4_forcereconf;
281 struct in6_addr *dns;
288 size_t dhcpv6_raw_len;
289 bool dhcpv6_assignall;
299 extern struct avl_tree interfaces;
301 #define RA_MANAGED_NO_MFLAG 0
302 #define RA_MANAGED_MFLAG 1
303 #define RA_MANAGED_NO_AFLAG 2
306 // Exported main functions
307 int odhcpd_register(struct odhcpd_event *event);
308 int odhcpd_deregister(struct odhcpd_event *event);
309 void odhcpd_process(struct odhcpd_event *event);
311 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
312 struct iovec *iov, size_t iov_len,
313 const struct interface *iface);
314 int odhcpd_get_interface_dns_addr(const struct interface *iface,
315 struct in6_addr *addr);
316 int odhcpd_get_interface_config(const char *ifname, const char *what);
317 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
318 struct interface* odhcpd_get_interface_by_index(int ifindex);
319 struct interface* odhcpd_get_master_interface(void);
320 int odhcpd_urandom(void *data, size_t len);
322 void odhcpd_run(void);
323 time_t odhcpd_time(void);
324 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
325 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
326 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
328 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
329 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
331 int odhcpd_netmask2bitlen(bool v6, void *mask);
332 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
333 bool odhcpd_valid_hostname(const char *name);
335 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
336 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len);
337 struct lease *config_find_lease_by_mac(const uint8_t *mac);
338 struct lease *config_find_lease_by_hostid(const uint32_t hostid);
339 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr);
343 const char* ubus_get_ifname(const char *name);
344 void ubus_apply_network(void);
345 bool ubus_has_prefix(const char *name, const char *ifname);
346 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
347 const struct in_addr *addr, const char *name, const char *interface);
350 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
351 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
352 int dhcpv6_ia_init(void);
353 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable);
354 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c, time_t now,
355 dhcpv6_binding_cb_handler_t func, void *arg);
356 void dhcpv6_ia_write_statefile(void);
357 void dhcpv6_ia_free_assignment(struct dhcp_assignment *c);
359 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
360 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
361 struct odhcpd_ipaddr **addrs);
362 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
363 const int ifindex, const struct in6_addr *gw,
364 const uint32_t metric, const bool add);
365 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
366 const int ifindex, const bool add);
367 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
368 const int ifindex, const bool v6, const bool add);
369 void netlink_dump_neigh_table(const bool proxy);
370 void netlink_dump_addr_table(const bool v6);
372 // Exported module initializers
373 int netlink_init(void);
374 int router_init(void);
375 int dhcpv6_init(void);
377 #ifdef DHCPV4_SUPPORT
378 int dhcpv4_init(void);
379 void dhcpv4_free_assignment(struct dhcp_assignment *a);
381 int dhcpv4_setup_interface(struct interface *iface, bool enable);
383 int router_setup_interface(struct interface *iface, bool enable);
384 int dhcpv6_setup_interface(struct interface *iface, bool enable);
385 int ndp_setup_interface(struct interface *iface, bool enable);
387 void odhcpd_reload(void);