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;
47 extern struct config config;
50 struct uloop_fd uloop;
51 void (*handle_dgram)(void *addr, void *data, size_t len,
52 struct interface *iface, void *dest_addr);
53 void (*handle_error)(struct odhcpd_event *e, int error);
54 void (*recv_msgs)(struct odhcpd_event *e);
57 typedef void (*dhcpv6_binding_cb_handler_t)(struct in6_addr *addr, int prefix,
58 uint32_t pref, uint32_t valid,
66 struct netevent_handler_info {
67 struct interface *iface;
72 union if_addr gateway;
80 struct odhcpd_ipaddr *addrs;
91 NETEV_ADDRLIST_CHANGE,
94 NETEV_ADDR6LIST_CHANGE,
101 struct netevent_handler {
102 struct list_head head;
103 void (*cb) (unsigned long event, struct netevent_handler_info *info);
106 struct odhcpd_ipaddr {
116 struct in_addr broadcast;
127 enum odhcpd_assignment_flags {
128 OAF_TENTATIVE = (1 << 0),
129 OAF_BOUND = (1 << 1),
130 OAF_STATIC = (1 << 2),
131 OAF_BROKEN_HOSTNAME = (1 << 3),
132 OAF_DHCPV4 = (1 << 4),
133 OAF_DHCPV6_NA = (1 << 5),
134 OAF_DHCPV6_PD = (1 << 6),
141 char *dhcp_statefile;
147 struct vlist_node node;
148 struct list_head assignments;
151 struct ether_addr mac;
159 struct odhcpd_ref_ip;
161 struct dhcp_assignment {
162 struct list_head head;
163 struct list_head lease_list;
165 void (*dhcp_free_cb)(struct dhcp_assignment *a);
167 struct interface *iface;
170 struct sockaddr_in6 peer;
173 #define fr_timer reconf_timer
174 struct uloop_timeout reconf_timer;
175 #define accept_fr_nonce accept_reconf
177 #define fr_cnt reconf_cnt
180 struct odhcpd_ref_ip *fr_ip;
185 uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
187 struct odhcpd_ipaddr *managed;
188 ssize_t managed_size;
189 struct ustream_fd managed_sock;
211 struct odhcpd_ipaddr *addr6;
215 struct odhcpd_event router_event;
216 struct uloop_timeout timer_rs;
219 // DHCPv6 runtime data
220 struct odhcpd_event dhcpv6_event;
221 struct list_head ia_assignments;
224 struct odhcpd_event ndp_event;
228 struct odhcpd_ipaddr *addr4;
231 // DHCPv4 runtime data
232 struct odhcpd_event dhcpv4_event;
233 struct list_head dhcpv4_assignments;
234 struct list_head dhcpv4_fr_ips;
237 char dhcpv6_pd_manager[128];
238 struct in6_addr dhcpv6_pd_cer;
242 enum odhcpd_mode dhcpv6;
243 enum odhcpd_mode ndp;
244 enum odhcpd_mode dhcpv4;
251 bool always_rewrite_dns;
261 bool ra_useleasetime;
263 bool no_dynamic_dhcp;
264 uint8_t pio_filter_length;
265 struct in6_addr pio_filter_addr;
267 int route_preference;
271 uint32_t ra_reachabletime;
272 uint32_t ra_retranstime;
273 uint32_t ra_hoplimit;
277 uint32_t dhcp_leasetime;
280 struct in_addr dhcpv4_start;
281 struct in_addr dhcpv4_end;
282 struct in_addr dhcpv4_start_ip;
283 struct in_addr dhcpv4_end_ip;
284 struct in_addr dhcpv4_local;
285 struct in_addr dhcpv4_bcast;
286 struct in_addr dhcpv4_mask;
287 struct in_addr *dhcpv4_router;
288 size_t dhcpv4_router_cnt;
289 struct in_addr *dhcpv4_dns;
290 size_t dhcpv4_dns_cnt;
291 bool dhcpv4_forcereconf;
294 struct in6_addr *dns;
301 size_t dhcpv6_raw_len;
302 bool dhcpv6_assignall;
312 extern struct avl_tree interfaces;
314 inline static void free_assignment(struct dhcp_assignment *a)
317 list_del(&a->lease_list);
327 inline static struct dhcp_assignment *alloc_assignment(size_t extra_len)
329 struct dhcp_assignment *a = calloc(1, sizeof(*a) + extra_len);
334 INIT_LIST_HEAD(&a->head);
335 INIT_LIST_HEAD(&a->lease_list);
340 // Exported main functions
341 int odhcpd_register(struct odhcpd_event *event);
342 int odhcpd_deregister(struct odhcpd_event *event);
343 void odhcpd_process(struct odhcpd_event *event);
345 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
346 struct iovec *iov, size_t iov_len,
347 const struct interface *iface);
348 int odhcpd_get_interface_dns_addr(const struct interface *iface,
349 struct in6_addr *addr);
350 int odhcpd_get_interface_config(const char *ifname, const char *what);
351 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
352 struct interface* odhcpd_get_interface_by_index(int ifindex);
353 int odhcpd_urandom(void *data, size_t len);
355 void odhcpd_run(void);
356 time_t odhcpd_time(void);
357 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
358 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
359 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
361 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
362 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
364 int odhcpd_netmask2bitlen(bool v6, void *mask);
365 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
366 bool odhcpd_valid_hostname(const char *name);
368 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
369 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len);
370 struct lease *config_find_lease_by_mac(const uint8_t *mac);
371 struct lease *config_find_lease_by_hostid(const uint32_t hostid);
372 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr);
376 const char* ubus_get_ifname(const char *name);
377 void ubus_apply_network(void);
378 bool ubus_has_prefix(const char *name, const char *ifname);
379 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
380 const struct in_addr *addr, const char *name, const char *interface);
383 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
384 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
385 int dhcpv6_ia_init(void);
386 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable);
387 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c, time_t now,
388 dhcpv6_binding_cb_handler_t func, void *arg);
389 void dhcpv6_ia_write_statefile(void);
391 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
392 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
393 struct odhcpd_ipaddr **addrs);
394 int netlink_get_interface_proxy_neigh(int ifindex, const struct in6_addr *addr);
395 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
396 const int ifindex, const struct in6_addr *gw,
397 const uint32_t metric, const bool add);
398 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
399 const int ifindex, const bool add);
400 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
401 const int ifindex, const bool v6, const bool add);
402 void netlink_dump_neigh_table(const bool proxy);
403 void netlink_dump_addr_table(const bool v6);
405 // Exported module initializers
406 int netlink_init(void);
407 int router_init(void);
408 int dhcpv6_init(void);
410 #ifdef DHCPV4_SUPPORT
411 int dhcpv4_init(void);
413 int dhcpv4_setup_interface(struct interface *iface, bool enable);
415 int router_setup_interface(struct interface *iface, bool enable);
416 int dhcpv6_setup_interface(struct interface *iface, bool enable);
417 int ndp_setup_interface(struct interface *iface, bool enable);
419 void odhcpd_reload(void);