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Sources/odhcpd/src/odhcpd.h

  1 /**
  2  * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
  3  *
  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.
  7  *
  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.
 12  *
 13  */
 14 
 15 #pragma once
 16 #include <netinet/in.h>
 17 #include <netinet/icmp6.h>
 18 #include <netinet/ether.h>
 19 #include <stdbool.h>
 20 #include <syslog.h>
 21 
 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>
 28 
 29 #define min(a, b) (((a) < (b)) ? (a) : (b))
 30 #define max(a, b) (((a) > (b)) ? (a) : (b))
 31 
 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
 36 
 37 #define INFINITE_VALID(x) ((x) == 0)
 38 
 39 #define _unused __attribute__((unused))
 40 #define _packed __attribute__((packed))
 41 
 42 #define ALL_IPV6_NODES "ff02::1"
 43 #define ALL_IPV6_ROUTERS "ff02::2"
 44 
 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
 49 
 50 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
 51 
 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)
 56 
 57 struct interface;
 58 struct nl_sock;
 59 extern struct vlist_tree leases;
 60 extern struct config config;
 61 
 62 struct odhcpd_event {
 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);
 68 };
 69 
 70 typedef int (*send_reply_cb_t)(const void *buf, size_t len,
 71                                const struct sockaddr *dest, socklen_t dest_len,
 72                                void *opaque);
 73 
 74 typedef void (*dhcpv6_binding_cb_handler_t)(struct in6_addr *addr, int prefix,
 75                                             uint32_t pref, uint32_t valid,
 76                                             void *arg);
 77 
 78 union if_addr {
 79         struct in_addr in;
 80         struct in6_addr in6;
 81 };
 82 
 83 struct netevent_handler_info {
 84         struct interface *iface;
 85         union {
 86                 struct {
 87                         union if_addr dst;
 88                         uint8_t dst_len;
 89                         union if_addr gateway;
 90                 } rt;
 91                 struct {
 92                         union if_addr dst;
 93                         uint16_t state;
 94                         uint8_t flags;
 95                 } neigh;
 96                 struct {
 97                         struct odhcpd_ipaddr *addrs;
 98                         size_t len;
 99                 } addrs_old;
100                 union if_addr addr;
101         };
102 };
103 
104 enum netevents {
105         NETEV_IFINDEX_CHANGE,
106         NETEV_ADDR_ADD,
107         NETEV_ADDR_DEL,
108         NETEV_ADDRLIST_CHANGE,
109         NETEV_ADDR6_ADD,
110         NETEV_ADDR6_DEL,
111         NETEV_ADDR6LIST_CHANGE,
112         NETEV_ROUTE6_ADD,
113         NETEV_ROUTE6_DEL,
114         NETEV_NEIGH6_ADD,
115         NETEV_NEIGH6_DEL,
116 };
117 
118 struct netevent_handler {
119         struct list_head head;
120         void (*cb) (unsigned long event, struct netevent_handler_info *info);
121 };
122 
123 struct odhcpd_ipaddr {
124         union if_addr addr;
125         uint8_t prefix;
126         uint32_t preferred;
127         uint32_t valid;
128 
129         union {
130                 /* ipv6 only */
131                 struct {
132                         uint8_t dprefix;
133                         uint8_t invalid_advertisements;
134                         bool tentative;
135                 };
136 
137                 /* ipv4 only */
138                 struct in_addr broadcast;
139         };
140 };
141 
142 enum odhcpd_mode {
143         MODE_DISABLED,
144         MODE_SERVER,
145         MODE_RELAY,
146         MODE_HYBRID
147 };
148 
149 
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),
158 };
159 
160 struct config {
161         bool legacy;
162         bool main_dhcpv4;
163         char *dhcp_cb;
164         char *dhcp_statefile;
165         int log_level;
166 };
167 
168 
169 struct lease {
170         struct vlist_node node;
171         struct list_head assignments;
172         uint32_t ipaddr;
173         uint64_t hostid;
174         struct ether_addr mac;
175         uint16_t duid_len;
176         uint8_t *duid;
177         uint32_t leasetime;
178         char *hostname;
179 };
180 
181 enum {
182         LEASE_ATTR_IP,
183         LEASE_ATTR_MAC,
184         LEASE_ATTR_DUID,
185         LEASE_ATTR_HOSTID,
186         LEASE_ATTR_LEASETIME,
187         LEASE_ATTR_NAME,
188         LEASE_ATTR_MAX
189 };
190 
191 struct odhcpd_ref_ip;
192 
193 struct dhcp_assignment {
194         struct list_head head;
195         struct list_head lease_list;
196 
197         void (*dhcp_free_cb)(struct dhcp_assignment *a);
198 
199         struct interface *iface;
200         struct lease *lease;
201 
202         struct sockaddr_in6 peer;
203         time_t valid_until;
204         time_t preferred_until;
205 
206 #define fr_timer        reconf_timer
207         struct uloop_timeout reconf_timer;
208 #define accept_fr_nonce accept_reconf
209         bool accept_reconf;
210 #define fr_cnt          reconf_cnt
211         int reconf_cnt;
212         uint8_t key[16];
213         struct odhcpd_ref_ip *fr_ip;
214 
215         uint32_t addr;
216         union {
217                 uint64_t assigned_host_id;
218                 uint32_t assigned_subnet_id;
219         };
220         uint32_t iaid;
221         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
222 
223         struct odhcpd_ipaddr *managed;
224         ssize_t managed_size;
225         struct ustream_fd managed_sock;
226 
227         unsigned int flags;
228         uint32_t leasetime;
229         char *hostname;
230         char *reqopts;
231 #define hwaddr          mac
232         uint8_t mac[6];
233 
234         uint16_t clid_len;
235         uint8_t clid_data[];
236 };
237 
238 
239 struct interface {
240         struct avl_node avl;
241 
242         int ifflags;
243         int ifindex;
244         char *ifname;
245         const char *name;
246 
247         // IPv6 runtime data
248         struct odhcpd_ipaddr *addr6;
249         size_t addr6_len;
250         struct odhcpd_ipaddr *invalid_addr6;
251         size_t invalid_addr6_len;
252 
253         // RA runtime data
254         struct odhcpd_event router_event;
255         struct uloop_timeout timer_rs;
256         uint32_t ra_sent;
257 
258         // DHCPv6 runtime data
259         struct odhcpd_event dhcpv6_event;
260         struct list_head ia_assignments;
261 
262         // NDP runtime data
263         struct odhcpd_event ndp_event;
264         int ndp_ping_fd;
265 
266         // IPv4 runtime data
267         struct odhcpd_ipaddr *addr4;
268         size_t addr4_len;
269 
270         // DHCPv4 runtime data
271         struct odhcpd_event dhcpv4_event;
272         struct list_head dhcpv4_assignments;
273         struct list_head dhcpv4_fr_ips;
274 
275         // Managed PD
276         char dhcpv6_pd_manager[128];
277         struct in6_addr dhcpv6_pd_cer;
278 
279         // Services
280         enum odhcpd_mode ra;
281         enum odhcpd_mode dhcpv6;
282         enum odhcpd_mode ndp;
283         enum odhcpd_mode dhcpv4;
284 
285         // Config
286         bool inuse;
287         bool external;
288         bool master;
289         bool ignore;
290         bool always_rewrite_dns;
291         bool dns_service;
292 
293         // NDP
294         int learn_routes;
295 
296         // RA
297         uint8_t ra_flags;
298         bool ra_slaac;
299         bool ra_not_onlink;
300         bool ra_advrouter;
301         bool ra_useleasetime;
302         bool ra_dns;
303         bool no_dynamic_dhcp;
304         bool have_link_local;
305         uint8_t pio_filter_length;
306         struct in6_addr pio_filter_addr;
307         int default_router;
308         int route_preference;
309         int ra_maxinterval;
310         int ra_mininterval;
311         int ra_lifetime;
312         uint32_t ra_reachabletime;
313         uint32_t ra_retranstime;
314         uint32_t ra_hoplimit;
315         int ra_mtu;
316         uint32_t preferred_lifetime;
317 
318         // DHCP
319         uint32_t dhcp_leasetime;
320 
321         // DHCPv4
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;
334 
335         // DNS
336         struct in6_addr *dns;
337         size_t dns_cnt;
338         uint8_t *search;
339         size_t search_len;
340 
341         // DHCPV6
342         void *dhcpv6_raw;
343         size_t dhcpv6_raw_len;
344         bool dhcpv6_assignall;
345         bool dhcpv6_pd;
346         bool dhcpv6_na;
347         uint32_t dhcpv6_hostid_len;
348 
349         char *upstream;
350         size_t upstream_len;
351 
352         char *filter_class;
353 
354         // NTP
355         struct in_addr *dhcpv4_ntp;
356         size_t dhcpv4_ntp_cnt;
357         uint8_t *dhcpv6_ntp;
358         uint16_t dhcpv6_ntp_len;
359         size_t dhcpv6_ntp_cnt;
360 
361         // SNTP
362         struct in6_addr *dhcpv6_sntp;
363         size_t dhcpv6_sntp_cnt;
364 };
365 
366 extern struct avl_tree interfaces;
367 extern const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX];
368 
369 inline static void free_assignment(struct dhcp_assignment *a)
370 {
371         list_del(&a->head);
372         list_del(&a->lease_list);
373 
374         if (a->dhcp_free_cb)
375                 a->dhcp_free_cb(a);
376 
377         free(a->hostname);
378         free(a->reqopts);
379         free(a);
380 }
381 
382 inline static struct dhcp_assignment *alloc_assignment(size_t extra_len)
383 {
384         struct dhcp_assignment *a = calloc(1, sizeof(*a) + extra_len);
385 
386         if (!a)
387                 return NULL;
388 
389         INIT_LIST_HEAD(&a->head);
390         INIT_LIST_HEAD(&a->lease_list);
391 
392         return a;
393 }
394 
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);
399 
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);
410 
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);
416 
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);
419 
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);
423 
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);
430 
431 #ifdef WITH_UBUS
432 int ubus_init(void);
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);
438 #endif
439 
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);
447 
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);
461 
462 // Exported module initializers
463 int netlink_init(void);
464 int router_init(void);
465 int dhcpv6_init(void);
466 int ndp_init(void);
467 #ifdef DHCPV4_SUPPORT
468 int dhcpv4_init(void);
469 
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);
474 #endif
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);
478 
479 void odhcpd_reload(void);
480 

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