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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 // RFC 8781 defines PREF64 option
 38 #define ND_OPT_PREF64 38
 39 
 40 // RFC 9463 - Discovery of Network-designated Resolvers (DNR)
 41 #define ND_OPT_DNR 144
 42 
 43 #define INFINITE_VALID(x) ((x) == 0)
 44 
 45 #define _unused __attribute__((unused))
 46 #define _packed __attribute__((packed))
 47 
 48 #define ALL_IPV6_NODES "ff02::1"
 49 #define ALL_IPV6_ROUTERS "ff02::2"
 50 
 51 #define NTP_SUBOPTION_SRV_ADDR 1
 52 #define NTP_SUBOPTION_MC_ADDR 2
 53 #define NTP_SUBOPTION_SRV_FQDN 3
 54 #define IPV6_ADDR_LEN 16
 55 
 56 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
 57 
 58 #define ADDR_MATCH_PIO_FILTER(_addr, iface) (odhcpd_bmemcmp(&(_addr)->addr, \
 59                                                             &(iface)->pio_filter_addr, \
 60                                                             (iface)->pio_filter_length) != 0 || \
 61                                              (_addr)->prefix < (iface)->pio_filter_length)
 62 
 63 struct interface;
 64 struct nl_sock;
 65 extern struct vlist_tree leases;
 66 extern struct config config;
 67 
 68 struct odhcpd_event {
 69         struct uloop_fd uloop;
 70         void (*handle_dgram)(void *addr, void *data, size_t len,
 71                         struct interface *iface, void *dest_addr);
 72         void (*handle_error)(struct odhcpd_event *e, int error);
 73         void (*recv_msgs)(struct odhcpd_event *e);
 74 };
 75 
 76 typedef int (*send_reply_cb_t)(const void *buf, size_t len,
 77                                const struct sockaddr *dest, socklen_t dest_len,
 78                                void *opaque);
 79 
 80 typedef void (*dhcpv6_binding_cb_handler_t)(struct in6_addr *addr, int prefix,
 81                                             uint32_t pref, uint32_t valid,
 82                                             void *arg);
 83 
 84 union if_addr {
 85         struct in_addr in;
 86         struct in6_addr in6;
 87 };
 88 
 89 struct netevent_handler_info {
 90         struct interface *iface;
 91         union {
 92                 struct {
 93                         union if_addr dst;
 94                         uint8_t dst_len;
 95                         union if_addr gateway;
 96                 } rt;
 97                 struct {
 98                         union if_addr dst;
 99                         uint16_t state;
100                         uint8_t flags;
101                 } neigh;
102                 struct {
103                         struct odhcpd_ipaddr *addrs;
104                         size_t len;
105                 } addrs_old;
106                 union if_addr addr;
107         };
108 };
109 
110 enum netevents {
111         NETEV_IFINDEX_CHANGE,
112         NETEV_ADDR_ADD,
113         NETEV_ADDR_DEL,
114         NETEV_ADDRLIST_CHANGE,
115         NETEV_ADDR6_ADD,
116         NETEV_ADDR6_DEL,
117         NETEV_ADDR6LIST_CHANGE,
118         NETEV_ROUTE6_ADD,
119         NETEV_ROUTE6_DEL,
120         NETEV_NEIGH6_ADD,
121         NETEV_NEIGH6_DEL,
122 };
123 
124 struct netevent_handler {
125         struct list_head head;
126         void (*cb) (unsigned long event, struct netevent_handler_info *info);
127 };
128 
129 struct odhcpd_ipaddr {
130         union if_addr addr;
131         uint8_t prefix;
132         uint32_t preferred_lt;
133         uint32_t valid_lt;
134 
135         union {
136                 /* ipv6 only */
137                 struct {
138                         uint8_t dprefix;
139                         uint8_t invalid_advertisements;
140                         bool tentative;
141                 };
142 
143                 /* ipv4 only */
144                 struct in_addr broadcast;
145         };
146 };
147 
148 enum odhcpd_mode {
149         MODE_DISABLED,
150         MODE_SERVER,
151         MODE_RELAY,
152         MODE_HYBRID
153 };
154 
155 
156 enum odhcpd_assignment_flags {
157         OAF_TENTATIVE           = (1 << 0),
158         OAF_BOUND               = (1 << 1),
159         OAF_STATIC              = (1 << 2),
160         OAF_BROKEN_HOSTNAME     = (1 << 3),
161         OAF_DHCPV4              = (1 << 4),
162         OAF_DHCPV6_NA           = (1 << 5),
163         OAF_DHCPV6_PD           = (1 << 6),
164 };
165 
166 struct config {
167         bool legacy;
168         bool main_dhcpv4;
169         char *dhcp_cb;
170         char *dhcp_statefile;
171         char *dhcp_hostsfile;
172         int log_level;
173 };
174 
175 
176 struct lease {
177         struct vlist_node node;
178         struct list_head assignments;
179         uint32_t ipaddr;
180         uint64_t hostid;
181         struct ether_addr mac;
182         uint16_t duid_len;
183         uint8_t *duid;
184         uint32_t leasetime;
185         char *hostname;
186 };
187 
188 enum {
189         LEASE_ATTR_IP,
190         LEASE_ATTR_MAC,
191         LEASE_ATTR_DUID,
192         LEASE_ATTR_HOSTID,
193         LEASE_ATTR_LEASETIME,
194         LEASE_ATTR_NAME,
195         LEASE_ATTR_MAX
196 };
197 
198 struct odhcpd_ref_ip;
199 
200 struct dhcp_assignment {
201         struct list_head head;
202         struct list_head lease_list;
203 
204         void (*dhcp_free_cb)(struct dhcp_assignment *a);
205 
206         struct interface *iface;
207         struct lease *lease;
208 
209         struct sockaddr_in6 peer;
210         time_t valid_until;
211         time_t preferred_until;
212 
213 #define fr_timer        reconf_timer
214         struct uloop_timeout reconf_timer;
215 #define accept_fr_nonce accept_reconf
216         bool accept_reconf;
217 #define fr_cnt          reconf_cnt
218         int reconf_cnt;
219         uint8_t key[16];
220         struct odhcpd_ref_ip *fr_ip;
221 
222         uint32_t addr;
223         union {
224                 uint64_t assigned_host_id;
225                 uint32_t assigned_subnet_id;
226         };
227         uint32_t iaid;
228         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
229 
230         struct odhcpd_ipaddr *managed;
231         ssize_t managed_size;
232         struct ustream_fd managed_sock;
233 
234         unsigned int flags;
235         uint32_t leasetime;
236         char *hostname;
237         uint8_t *reqopts;
238         size_t reqopts_len;
239 
240 #define hwaddr          mac
241         uint8_t mac[6];
242 
243         uint16_t clid_len;
244         uint8_t clid_data[];
245 };
246 
247 
248 // DNR - RFC9463
249 struct dnr_options {
250         uint16_t priority;
251 
252         uint32_t lifetime;
253         bool lifetime_set;
254 
255         uint8_t *adn;
256         uint16_t adn_len;
257 
258         struct in_addr *addr4;
259         size_t addr4_cnt;
260         struct in6_addr *addr6;
261         size_t addr6_cnt;
262 
263         uint8_t *svc;
264         uint16_t svc_len;
265 };
266 
267 
268 struct interface {
269         struct avl_node avl;
270 
271         int ifflags;
272         int ifindex;
273         char *ifname;
274         const char *name;
275 
276         // IPv6 runtime data
277         struct odhcpd_ipaddr *addr6;
278         size_t addr6_len;
279         struct odhcpd_ipaddr *invalid_addr6;
280         size_t invalid_addr6_len;
281 
282         // RA runtime data
283         struct odhcpd_event router_event;
284         struct uloop_timeout timer_rs;
285         uint32_t ra_sent;
286 
287         // DHCPv6 runtime data
288         struct odhcpd_event dhcpv6_event;
289         struct list_head ia_assignments;
290 
291         // NDP runtime data
292         struct odhcpd_event ndp_event;
293         int ndp_ping_fd;
294 
295         // IPv4 runtime data
296         struct odhcpd_ipaddr *addr4;
297         size_t addr4_len;
298 
299         // DHCPv4 runtime data
300         struct odhcpd_event dhcpv4_event;
301         struct list_head dhcpv4_assignments;
302         struct list_head dhcpv4_fr_ips;
303 
304         // Managed PD
305         char dhcpv6_pd_manager[128];
306         struct in6_addr dhcpv6_pd_cer;
307 
308         // Services
309         enum odhcpd_mode ra;
310         enum odhcpd_mode dhcpv6;
311         enum odhcpd_mode ndp;
312         enum odhcpd_mode dhcpv4;
313 
314         // Config
315         bool inuse;
316         bool external;
317         bool master;
318         bool ignore;
319         bool always_rewrite_dns;
320         bool dns_service;
321 
322         // NDP
323         int learn_routes;
324 
325         // RA
326         uint8_t ra_flags;
327         bool ra_slaac;
328         bool ra_not_onlink;
329         bool ra_advrouter;
330         bool ra_useleasetime;
331         bool ra_dns;
332         uint8_t pref64_length;
333         uint8_t pref64_plc;
334         uint32_t pref64_prefix[3];
335         bool no_dynamic_dhcp;
336         bool have_link_local;
337         uint8_t pio_filter_length;
338         struct in6_addr pio_filter_addr;
339         int default_router;
340         int route_preference;
341         int ra_maxinterval;
342         int ra_mininterval;
343         int ra_lifetime;
344         uint32_t ra_reachabletime;
345         uint32_t ra_retranstime;
346         uint32_t ra_hoplimit;
347         int ra_mtu;
348         uint32_t preferred_lifetime;
349 
350         // DHCP
351         uint32_t dhcp_leasetime;
352 
353         // DHCPv4
354         struct in_addr dhcpv4_start;
355         struct in_addr dhcpv4_end;
356         struct in_addr dhcpv4_start_ip;
357         struct in_addr dhcpv4_end_ip;
358         struct in_addr dhcpv4_local;
359         struct in_addr dhcpv4_bcast;
360         struct in_addr dhcpv4_mask;
361         struct in_addr *dhcpv4_router;
362         size_t dhcpv4_router_cnt;
363         struct in_addr *dhcpv4_dns;
364         size_t dhcpv4_dns_cnt;
365         bool dhcpv4_forcereconf;
366 
367         // DNS
368         struct in6_addr *dns;
369         size_t dns_cnt;
370         uint8_t *search;
371         size_t search_len;
372 
373         // DHCPV6
374         void *dhcpv6_raw;
375         size_t dhcpv6_raw_len;
376         bool dhcpv6_assignall;
377         bool dhcpv6_pd;
378         bool dhcpv6_na;
379         uint32_t dhcpv6_hostid_len;
380         uint32_t dhcpv6_pd_min_len; // minimum delegated prefix length
381 
382         char *upstream;
383         size_t upstream_len;
384 
385         char *filter_class;
386 
387         // NTP
388         struct in_addr *dhcpv4_ntp;
389         size_t dhcpv4_ntp_cnt;
390         uint8_t *dhcpv6_ntp;
391         uint16_t dhcpv6_ntp_len;
392         size_t dhcpv6_ntp_cnt;
393 
394         // SNTP
395         struct in6_addr *dhcpv6_sntp;
396         size_t dhcpv6_sntp_cnt;
397 
398         // DNR
399         struct dnr_options *dnr;
400         size_t dnr_cnt;
401 };
402 
403 extern struct avl_tree interfaces;
404 extern const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX];
405 
406 inline static void free_assignment(struct dhcp_assignment *a)
407 {
408         list_del(&a->head);
409         list_del(&a->lease_list);
410 
411         if (a->dhcp_free_cb)
412                 a->dhcp_free_cb(a);
413 
414         free(a->hostname);
415         free(a->reqopts);
416         free(a);
417 }
418 
419 inline static struct dhcp_assignment *alloc_assignment(size_t extra_len)
420 {
421         struct dhcp_assignment *a = calloc(1, sizeof(*a) + extra_len);
422 
423         if (!a)
424                 return NULL;
425 
426         INIT_LIST_HEAD(&a->head);
427         INIT_LIST_HEAD(&a->lease_list);
428 
429         return a;
430 }
431 
432 // Exported main functions
433 int odhcpd_register(struct odhcpd_event *event);
434 int odhcpd_deregister(struct odhcpd_event *event);
435 void odhcpd_process(struct odhcpd_event *event);
436 
437 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
438                 struct iovec *iov, size_t iov_len,
439                 const struct interface *iface);
440 int odhcpd_get_interface_dns_addr(const struct interface *iface,
441                 struct in6_addr *addr);
442 int odhcpd_get_interface_config(const char *ifname, const char *what);
443 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
444 int odhcpd_get_flags(const struct interface *iface);
445 struct interface* odhcpd_get_interface_by_index(int ifindex);
446 int odhcpd_urandom(void *data, size_t len);
447 
448 void odhcpd_run(void);
449 time_t odhcpd_time(void);
450 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
451 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
452 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
453 
454 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
455 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
456 
457 int odhcpd_parse_addr6_prefix(const char *str, struct in6_addr *addr, uint8_t *prefix);
458 int odhcpd_netmask2bitlen(bool v6, void *mask);
459 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
460 bool odhcpd_valid_hostname(const char *name);
461 
462 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
463 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len);
464 struct lease *config_find_lease_by_mac(const uint8_t *mac);
465 struct lease *config_find_lease_by_hostid(const uint64_t hostid);
466 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr);
467 int set_lease_from_blobmsg(struct blob_attr *ba);
468 
469 #ifdef WITH_UBUS
470 int ubus_init(void);
471 const char* ubus_get_ifname(const char *name);
472 void ubus_apply_network(void);
473 bool ubus_has_prefix(const char *name, const char *ifname);
474 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
475                 const struct in_addr *addr, const char *name, const char *interface);
476 #endif
477 
478 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
479                 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
480 int dhcpv6_ia_init(void);
481 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable);
482 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c, time_t now,
483                                 dhcpv6_binding_cb_handler_t func, void *arg);
484 void dhcpv6_ia_write_statefile(void);
485 
486 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
487 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
488                 struct odhcpd_ipaddr **addrs);
489 ssize_t netlink_get_interface_linklocal(int ifindex, struct odhcpd_ipaddr **addrs);
490 int netlink_get_interface_proxy_neigh(int ifindex, const struct in6_addr *addr);
491 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
492                 const int ifindex, const struct in6_addr *gw,
493                 const uint32_t metric, const bool add);
494 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
495                 const int ifindex, const bool add);
496 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
497                 const int ifindex, const bool v6, const bool add);
498 void netlink_dump_neigh_table(const bool proxy);
499 void netlink_dump_addr_table(const bool v6);
500 
501 // Exported module initializers
502 int netlink_init(void);
503 int router_init(void);
504 int dhcpv6_init(void);
505 int ndp_init(void);
506 #ifdef DHCPV4_SUPPORT
507 int dhcpv4_init(void);
508 
509 int dhcpv4_setup_interface(struct interface *iface, bool enable);
510 void dhcpv4_handle_msg(void *addr, void *data, size_t len,
511                        struct interface *iface, _unused void *dest_addr,
512                        send_reply_cb_t send_reply, void *opaque);
513 #endif
514 int router_setup_interface(struct interface *iface, bool enable);
515 int dhcpv6_setup_interface(struct interface *iface, bool enable);
516 int ndp_setup_interface(struct interface *iface, bool enable);
517 void reload_services(struct interface *iface);
518 
519 void odhcpd_reload(void);
520 

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