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
;
137 struct in_addr broadcast
;
149 enum odhcpd_assignment_flags
{
150 OAF_TENTATIVE
= (1 << 0),
151 OAF_BOUND
= (1 << 1),
152 OAF_STATIC
= (1 << 2),
153 OAF_BROKEN_HOSTNAME
= (1 << 3),
154 OAF_DHCPV4
= (1 << 4),
155 OAF_DHCPV6_NA
= (1 << 5),
156 OAF_DHCPV6_PD
= (1 << 6),
163 char *dhcp_statefile
;
169 struct vlist_node node
;
170 struct list_head assignments
;
173 struct ether_addr mac
;
185 LEASE_ATTR_LEASETIME
,
190 struct odhcpd_ref_ip
;
192 struct dhcp_assignment
{
193 struct list_head head
;
194 struct list_head lease_list
;
196 void (*dhcp_free_cb
)(struct dhcp_assignment
*a
);
198 struct interface
*iface
;
201 struct sockaddr_in6 peer
;
203 time_t preferred_until
;
205 #define fr_timer reconf_timer
206 struct uloop_timeout reconf_timer
;
207 #define accept_fr_nonce accept_reconf
209 #define fr_cnt reconf_cnt
212 struct odhcpd_ref_ip
*fr_ip
;
216 uint64_t assigned_host_id
;
217 uint32_t assigned_subnet_id
;
220 uint8_t length
; // length == 128 -> IA_NA, length <= 64 -> IA_PD
222 struct odhcpd_ipaddr
*managed
;
223 ssize_t managed_size
;
224 struct ustream_fd managed_sock
;
247 struct odhcpd_ipaddr
*addr6
;
249 struct odhcpd_ipaddr
*invalid_addr6
;
250 size_t invalid_addr6_len
;
253 struct odhcpd_event router_event
;
254 struct uloop_timeout timer_rs
;
257 // DHCPv6 runtime data
258 struct odhcpd_event dhcpv6_event
;
259 struct list_head ia_assignments
;
262 struct odhcpd_event ndp_event
;
266 struct odhcpd_ipaddr
*addr4
;
269 // DHCPv4 runtime data
270 struct odhcpd_event dhcpv4_event
;
271 struct list_head dhcpv4_assignments
;
272 struct list_head dhcpv4_fr_ips
;
275 char dhcpv6_pd_manager
[128];
276 struct in6_addr dhcpv6_pd_cer
;
280 enum odhcpd_mode dhcpv6
;
281 enum odhcpd_mode ndp
;
282 enum odhcpd_mode dhcpv4
;
289 bool always_rewrite_dns
;
300 bool ra_useleasetime
;
302 bool no_dynamic_dhcp
;
303 uint8_t pio_filter_length
;
304 struct in6_addr pio_filter_addr
;
306 int route_preference
;
310 uint32_t ra_reachabletime
;
311 uint32_t ra_retranstime
;
312 uint32_t ra_hoplimit
;
314 uint32_t preferred_lifetime
;
317 uint32_t dhcp_leasetime
;
320 struct in_addr dhcpv4_start
;
321 struct in_addr dhcpv4_end
;
322 struct in_addr dhcpv4_start_ip
;
323 struct in_addr dhcpv4_end_ip
;
324 struct in_addr dhcpv4_local
;
325 struct in_addr dhcpv4_bcast
;
326 struct in_addr dhcpv4_mask
;
327 struct in_addr
*dhcpv4_router
;
328 size_t dhcpv4_router_cnt
;
329 struct in_addr
*dhcpv4_dns
;
330 size_t dhcpv4_dns_cnt
;
331 bool dhcpv4_forcereconf
;
334 struct in6_addr
*dns
;
341 size_t dhcpv6_raw_len
;
342 bool dhcpv6_assignall
;
345 uint32_t dhcpv6_hostid_len
;
353 struct in_addr
*dhcpv4_ntp
;
354 size_t dhcpv4_ntp_cnt
;
356 uint16_t dhcpv6_ntp_len
;
357 size_t dhcpv6_ntp_cnt
;
360 struct in6_addr
*dhcpv6_sntp
;
361 size_t dhcpv6_sntp_cnt
;
364 extern struct avl_tree interfaces
;
365 extern const struct blobmsg_policy lease_attrs
[LEASE_ATTR_MAX
];
367 inline static void free_assignment(struct dhcp_assignment
*a
)
370 list_del(&a
->lease_list
);
380 inline static struct dhcp_assignment
*alloc_assignment(size_t extra_len
)
382 struct dhcp_assignment
*a
= calloc(1, sizeof(*a
) + extra_len
);
387 INIT_LIST_HEAD(&a
->head
);
388 INIT_LIST_HEAD(&a
->lease_list
);
393 // Exported main functions
394 int odhcpd_register(struct odhcpd_event
*event
);
395 int odhcpd_deregister(struct odhcpd_event
*event
);
396 void odhcpd_process(struct odhcpd_event
*event
);
398 ssize_t
odhcpd_send(int socket
, struct sockaddr_in6
*dest
,
399 struct iovec
*iov
, size_t iov_len
,
400 const struct interface
*iface
);
401 int odhcpd_get_interface_dns_addr(const struct interface
*iface
,
402 struct in6_addr
*addr
);
403 int odhcpd_get_interface_config(const char *ifname
, const char *what
);
404 int odhcpd_get_mac(const struct interface
*iface
, uint8_t mac
[6]);
405 int odhcpd_get_flags(const struct interface
*iface
);
406 struct interface
* odhcpd_get_interface_by_index(int ifindex
);
407 int odhcpd_urandom(void *data
, size_t len
);
409 void odhcpd_run(void);
410 time_t odhcpd_time(void);
411 ssize_t
odhcpd_unhexlify(uint8_t *dst
, size_t len
, const char *src
);
412 void odhcpd_hexlify(char *dst
, const uint8_t *src
, size_t len
);
413 const char *odhcpd_print_mac(const uint8_t *mac
, const size_t len
);
415 int odhcpd_bmemcmp(const void *av
, const void *bv
, size_t bits
);
416 void odhcpd_bmemcpy(void *av
, const void *bv
, size_t bits
);
418 int odhcpd_netmask2bitlen(bool v6
, void *mask
);
419 bool odhcpd_bitlen2netmask(bool v6
, unsigned int bits
, void *mask
);
420 bool odhcpd_valid_hostname(const char *name
);
422 int config_parse_interface(void *data
, size_t len
, const char *iname
, bool overwrite
);
423 struct lease
*config_find_lease_by_duid(const uint8_t *duid
, const uint16_t len
);
424 struct lease
*config_find_lease_by_mac(const uint8_t *mac
);
425 struct lease
*config_find_lease_by_hostid(const uint64_t hostid
);
426 struct lease
*config_find_lease_by_ipaddr(const uint32_t ipaddr
);
427 int set_lease_from_blobmsg(struct blob_attr
*ba
);
431 const char* ubus_get_ifname(const char *name
);
432 void ubus_apply_network(void);
433 bool ubus_has_prefix(const char *name
, const char *ifname
);
434 void ubus_bcast_dhcp_event(const char *type
, const uint8_t *mac
, const size_t mac_len
,
435 const struct in_addr
*addr
, const char *name
, const char *interface
);
438 ssize_t
dhcpv6_ia_handle_IAs(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
439 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
);
440 int dhcpv6_ia_init(void);
441 int dhcpv6_ia_setup_interface(struct interface
*iface
, bool enable
);
442 void dhcpv6_ia_enum_addrs(struct interface
*iface
, struct dhcp_assignment
*c
, time_t now
,
443 dhcpv6_binding_cb_handler_t func
, void *arg
);
444 void dhcpv6_ia_write_statefile(void);
446 int netlink_add_netevent_handler(struct netevent_handler
*hdlr
);
447 ssize_t
netlink_get_interface_addrs(const int ifindex
, bool v6
,
448 struct odhcpd_ipaddr
**addrs
);
449 int netlink_get_interface_proxy_neigh(int ifindex
, const struct in6_addr
*addr
);
450 int netlink_setup_route(const struct in6_addr
*addr
, const int prefixlen
,
451 const int ifindex
, const struct in6_addr
*gw
,
452 const uint32_t metric
, const bool add
);
453 int netlink_setup_proxy_neigh(const struct in6_addr
*addr
,
454 const int ifindex
, const bool add
);
455 int netlink_setup_addr(struct odhcpd_ipaddr
*addr
,
456 const int ifindex
, const bool v6
, const bool add
);
457 void netlink_dump_neigh_table(const bool proxy
);
458 void netlink_dump_addr_table(const bool v6
);
460 // Exported module initializers
461 int netlink_init(void);
462 int router_init(void);
463 int dhcpv6_init(void);
465 #ifdef DHCPV4_SUPPORT
466 int dhcpv4_init(void);
468 int dhcpv4_setup_interface(struct interface
*iface
, bool enable
);
469 void dhcpv4_handle_msg(void *addr
, void *data
, size_t len
,
470 struct interface
*iface
, _unused
void *dest_addr
,
471 send_reply_cb_t send_reply
, void *opaque
);
473 int router_setup_interface(struct interface
*iface
, bool enable
);
474 int dhcpv6_setup_interface(struct interface
*iface
, bool enable
);
475 int ndp_setup_interface(struct interface
*iface
, bool enable
);
477 void odhcpd_reload(void);