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 #define min(a, b) (((a) < (b)) ? (a) : (b))
30 #define max(a, b) (((a) > (b)) ? (a) : (b))
32 // RFC 6106 defines this router advertisement option
33 #define ND_OPT_ROUTE_INFO 24
34 #define ND_OPT_RECURSIVE_DNS 25
35 #define ND_OPT_DNS_SEARCH 31
37 #define INFINITE_VALID(x) ((x) == 0)
39 #define _unused __attribute__((unused))
40 #define _packed __attribute__((packed))
42 #define ALL_IPV6_NODES "ff02::1"
43 #define ALL_IPV6_ROUTERS "ff02::2"
45 #define NTP_SUBOPTION_SRV_ADDR 1
46 #define NTP_SUBOPTION_MC_ADDR 2
47 #define NTP_SUBOPTION_SRV_FQDN 3
48 #define IPV6_ADDR_LEN 16
50 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
52 #define ADDR_MATCH_PIO_FILTER(_addr, iface) (odhcpd_bmemcmp(&(_addr)->addr, \
53 &(iface)->pio_filter_addr, \
54 (iface)->pio_filter_length) != 0 || \
55 (_addr)->prefix < (iface)->pio_filter_length)
59 extern struct vlist_tree leases
;
60 extern struct config config
;
63 struct uloop_fd uloop
;
64 void (*handle_dgram
)(void *addr
, void *data
, size_t len
,
65 struct interface
*iface
, void *dest_addr
);
66 void (*handle_error
)(struct odhcpd_event
*e
, int error
);
67 void (*recv_msgs
)(struct odhcpd_event
*e
);
70 typedef int (*send_reply_cb_t
)(const void *buf
, size_t len
,
71 const struct sockaddr
*dest
, socklen_t dest_len
,
74 typedef void (*dhcpv6_binding_cb_handler_t
)(struct in6_addr
*addr
, int prefix
,
75 uint32_t pref
, uint32_t valid
,
83 struct netevent_handler_info
{
84 struct interface
*iface
;
89 union if_addr gateway
;
97 struct odhcpd_ipaddr
*addrs
;
105 NETEV_IFINDEX_CHANGE
,
108 NETEV_ADDRLIST_CHANGE
,
111 NETEV_ADDR6LIST_CHANGE
,
118 struct netevent_handler
{
119 struct list_head head
;
120 void (*cb
) (unsigned long event
, struct netevent_handler_info
*info
);
123 struct odhcpd_ipaddr
{
133 uint8_t invalid_advertisements
;
138 struct in_addr broadcast
;
150 enum odhcpd_assignment_flags
{
151 OAF_TENTATIVE
= (1 << 0),
152 OAF_BOUND
= (1 << 1),
153 OAF_STATIC
= (1 << 2),
154 OAF_BROKEN_HOSTNAME
= (1 << 3),
155 OAF_DHCPV4
= (1 << 4),
156 OAF_DHCPV6_NA
= (1 << 5),
157 OAF_DHCPV6_PD
= (1 << 6),
164 char *dhcp_statefile
;
170 struct vlist_node node
;
171 struct list_head assignments
;
174 struct ether_addr mac
;
186 LEASE_ATTR_LEASETIME
,
191 struct odhcpd_ref_ip
;
193 struct dhcp_assignment
{
194 struct list_head head
;
195 struct list_head lease_list
;
197 void (*dhcp_free_cb
)(struct dhcp_assignment
*a
);
199 struct interface
*iface
;
202 struct sockaddr_in6 peer
;
204 time_t preferred_until
;
206 #define fr_timer reconf_timer
207 struct uloop_timeout reconf_timer
;
208 #define accept_fr_nonce accept_reconf
210 #define fr_cnt reconf_cnt
213 struct odhcpd_ref_ip
*fr_ip
;
217 uint64_t assigned_host_id
;
218 uint32_t assigned_subnet_id
;
221 uint8_t length
; // length == 128 -> IA_NA, length <= 64 -> IA_PD
223 struct odhcpd_ipaddr
*managed
;
224 ssize_t managed_size
;
225 struct ustream_fd managed_sock
;
248 struct odhcpd_ipaddr
*addr6
;
250 struct odhcpd_ipaddr
*invalid_addr6
;
251 size_t invalid_addr6_len
;
254 struct odhcpd_event router_event
;
255 struct uloop_timeout timer_rs
;
258 // DHCPv6 runtime data
259 struct odhcpd_event dhcpv6_event
;
260 struct list_head ia_assignments
;
263 struct odhcpd_event ndp_event
;
267 struct odhcpd_ipaddr
*addr4
;
270 // DHCPv4 runtime data
271 struct odhcpd_event dhcpv4_event
;
272 struct list_head dhcpv4_assignments
;
273 struct list_head dhcpv4_fr_ips
;
276 char dhcpv6_pd_manager
[128];
277 struct in6_addr dhcpv6_pd_cer
;
281 enum odhcpd_mode dhcpv6
;
282 enum odhcpd_mode ndp
;
283 enum odhcpd_mode dhcpv4
;
290 bool always_rewrite_dns
;
301 bool ra_useleasetime
;
303 bool no_dynamic_dhcp
;
304 bool have_link_local
;
305 uint8_t pio_filter_length
;
306 struct in6_addr pio_filter_addr
;
308 int route_preference
;
312 uint32_t ra_reachabletime
;
313 uint32_t ra_retranstime
;
314 uint32_t ra_hoplimit
;
316 uint32_t preferred_lifetime
;
319 uint32_t dhcp_leasetime
;
322 struct in_addr dhcpv4_start
;
323 struct in_addr dhcpv4_end
;
324 struct in_addr dhcpv4_start_ip
;
325 struct in_addr dhcpv4_end_ip
;
326 struct in_addr dhcpv4_local
;
327 struct in_addr dhcpv4_bcast
;
328 struct in_addr dhcpv4_mask
;
329 struct in_addr
*dhcpv4_router
;
330 size_t dhcpv4_router_cnt
;
331 struct in_addr
*dhcpv4_dns
;
332 size_t dhcpv4_dns_cnt
;
333 bool dhcpv4_forcereconf
;
336 struct in6_addr
*dns
;
343 size_t dhcpv6_raw_len
;
344 bool dhcpv6_assignall
;
347 uint32_t dhcpv6_hostid_len
;
355 struct in_addr
*dhcpv4_ntp
;
356 size_t dhcpv4_ntp_cnt
;
358 uint16_t dhcpv6_ntp_len
;
359 size_t dhcpv6_ntp_cnt
;
362 struct in6_addr
*dhcpv6_sntp
;
363 size_t dhcpv6_sntp_cnt
;
366 extern struct avl_tree interfaces
;
367 extern const struct blobmsg_policy lease_attrs
[LEASE_ATTR_MAX
];
369 inline static void free_assignment(struct dhcp_assignment
*a
)
372 list_del(&a
->lease_list
);
382 inline static struct dhcp_assignment
*alloc_assignment(size_t extra_len
)
384 struct dhcp_assignment
*a
= calloc(1, sizeof(*a
) + extra_len
);
389 INIT_LIST_HEAD(&a
->head
);
390 INIT_LIST_HEAD(&a
->lease_list
);
395 // Exported main functions
396 int odhcpd_register(struct odhcpd_event
*event
);
397 int odhcpd_deregister(struct odhcpd_event
*event
);
398 void odhcpd_process(struct odhcpd_event
*event
);
400 ssize_t
odhcpd_send(int socket
, struct sockaddr_in6
*dest
,
401 struct iovec
*iov
, size_t iov_len
,
402 const struct interface
*iface
);
403 int odhcpd_get_interface_dns_addr(const struct interface
*iface
,
404 struct in6_addr
*addr
);
405 int odhcpd_get_interface_config(const char *ifname
, const char *what
);
406 int odhcpd_get_mac(const struct interface
*iface
, uint8_t mac
[6]);
407 int odhcpd_get_flags(const struct interface
*iface
);
408 struct interface
* odhcpd_get_interface_by_index(int ifindex
);
409 int odhcpd_urandom(void *data
, size_t len
);
411 void odhcpd_run(void);
412 time_t odhcpd_time(void);
413 ssize_t
odhcpd_unhexlify(uint8_t *dst
, size_t len
, const char *src
);
414 void odhcpd_hexlify(char *dst
, const uint8_t *src
, size_t len
);
415 const char *odhcpd_print_mac(const uint8_t *mac
, const size_t len
);
417 int odhcpd_bmemcmp(const void *av
, const void *bv
, size_t bits
);
418 void odhcpd_bmemcpy(void *av
, const void *bv
, size_t bits
);
420 int odhcpd_netmask2bitlen(bool v6
, void *mask
);
421 bool odhcpd_bitlen2netmask(bool v6
, unsigned int bits
, void *mask
);
422 bool odhcpd_valid_hostname(const char *name
);
424 int config_parse_interface(void *data
, size_t len
, const char *iname
, bool overwrite
);
425 struct lease
*config_find_lease_by_duid(const uint8_t *duid
, const uint16_t len
);
426 struct lease
*config_find_lease_by_mac(const uint8_t *mac
);
427 struct lease
*config_find_lease_by_hostid(const uint64_t hostid
);
428 struct lease
*config_find_lease_by_ipaddr(const uint32_t ipaddr
);
429 int set_lease_from_blobmsg(struct blob_attr
*ba
);
433 const char* ubus_get_ifname(const char *name
);
434 void ubus_apply_network(void);
435 bool ubus_has_prefix(const char *name
, const char *ifname
);
436 void ubus_bcast_dhcp_event(const char *type
, const uint8_t *mac
, const size_t mac_len
,
437 const struct in_addr
*addr
, const char *name
, const char *interface
);
440 ssize_t
dhcpv6_ia_handle_IAs(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
441 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
);
442 int dhcpv6_ia_init(void);
443 int dhcpv6_ia_setup_interface(struct interface
*iface
, bool enable
);
444 void dhcpv6_ia_enum_addrs(struct interface
*iface
, struct dhcp_assignment
*c
, time_t now
,
445 dhcpv6_binding_cb_handler_t func
, void *arg
);
446 void dhcpv6_ia_write_statefile(void);
448 int netlink_add_netevent_handler(struct netevent_handler
*hdlr
);
449 ssize_t
netlink_get_interface_addrs(const int ifindex
, bool v6
,
450 struct odhcpd_ipaddr
**addrs
);
451 int netlink_get_interface_proxy_neigh(int ifindex
, const struct in6_addr
*addr
);
452 int netlink_setup_route(const struct in6_addr
*addr
, const int prefixlen
,
453 const int ifindex
, const struct in6_addr
*gw
,
454 const uint32_t metric
, const bool add
);
455 int netlink_setup_proxy_neigh(const struct in6_addr
*addr
,
456 const int ifindex
, const bool add
);
457 int netlink_setup_addr(struct odhcpd_ipaddr
*addr
,
458 const int ifindex
, const bool v6
, const bool add
);
459 void netlink_dump_neigh_table(const bool proxy
);
460 void netlink_dump_addr_table(const bool v6
);
462 // Exported module initializers
463 int netlink_init(void);
464 int router_init(void);
465 int dhcpv6_init(void);
467 #ifdef DHCPV4_SUPPORT
468 int dhcpv4_init(void);
470 int dhcpv4_setup_interface(struct interface
*iface
, bool enable
);
471 void dhcpv4_handle_msg(void *addr
, void *data
, size_t len
,
472 struct interface
*iface
, _unused
void *dest_addr
,
473 send_reply_cb_t send_reply
, void *opaque
);
475 int router_setup_interface(struct interface
*iface
, bool enable
);
476 int dhcpv6_setup_interface(struct interface
*iface
, bool enable
);
477 int ndp_setup_interface(struct interface
*iface
, bool enable
);
479 void odhcpd_reload(void);