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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 #define INFINITE_VALID(x) ((x) == 0)
 41 
 42 #define _unused __attribute__((unused))
 43 #define _packed __attribute__((packed))
 44 
 45 #define ALL_IPV6_NODES "ff02::1"
 46 #define ALL_IPV6_ROUTERS "ff02::2"
 47 
 48 #define NTP_SUBOPTION_SRV_ADDR 1
 49 #define NTP_SUBOPTION_MC_ADDR 2
 50 #define NTP_SUBOPTION_SRV_FQDN 3
 51 #define IPV6_ADDR_LEN 16
 52 
 53 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
 54 
 55 #define ADDR_MATCH_PIO_FILTER(_addr, iface) (odhcpd_bmemcmp(&(_addr)->addr, \
 56                                                             &(iface)->pio_filter_addr, \
 57                                                             (iface)->pio_filter_length) != 0 || \
 58                                              (_addr)->prefix < (iface)->pio_filter_length)
 59 
 60 struct interface;
 61 struct nl_sock;
 62 extern struct vlist_tree leases;
 63 extern struct config config;
 64 
 65 struct odhcpd_event {
 66         struct uloop_fd uloop;
 67         void (*handle_dgram)(void *addr, void *data, size_t len,
 68                         struct interface *iface, void *dest_addr);
 69         void (*handle_error)(struct odhcpd_event *e, int error);
 70         void (*recv_msgs)(struct odhcpd_event *e);
 71 };
 72 
 73 typedef int (*send_reply_cb_t)(const void *buf, size_t len,
 74                                const struct sockaddr *dest, socklen_t dest_len,
 75                                void *opaque);
 76 
 77 typedef void (*dhcpv6_binding_cb_handler_t)(struct in6_addr *addr, int prefix,
 78                                             uint32_t pref, uint32_t valid,
 79                                             void *arg);
 80 
 81 union if_addr {
 82         struct in_addr in;
 83         struct in6_addr in6;
 84 };
 85 
 86 struct netevent_handler_info {
 87         struct interface *iface;
 88         union {
 89                 struct {
 90                         union if_addr dst;
 91                         uint8_t dst_len;
 92                         union if_addr gateway;
 93                 } rt;
 94                 struct {
 95                         union if_addr dst;
 96                         uint16_t state;
 97                         uint8_t flags;
 98                 } neigh;
 99                 struct {
100                         struct odhcpd_ipaddr *addrs;
101                         size_t len;
102                 } addrs_old;
103                 union if_addr addr;
104         };
105 };
106 
107 enum netevents {
108         NETEV_IFINDEX_CHANGE,
109         NETEV_ADDR_ADD,
110         NETEV_ADDR_DEL,
111         NETEV_ADDRLIST_CHANGE,
112         NETEV_ADDR6_ADD,
113         NETEV_ADDR6_DEL,
114         NETEV_ADDR6LIST_CHANGE,
115         NETEV_ROUTE6_ADD,
116         NETEV_ROUTE6_DEL,
117         NETEV_NEIGH6_ADD,
118         NETEV_NEIGH6_DEL,
119 };
120 
121 struct netevent_handler {
122         struct list_head head;
123         void (*cb) (unsigned long event, struct netevent_handler_info *info);
124 };
125 
126 struct odhcpd_ipaddr {
127         union if_addr addr;
128         uint8_t prefix;
129         uint32_t preferred;
130         uint32_t valid;
131 
132         union {
133                 /* ipv6 only */
134                 struct {
135                         uint8_t dprefix;
136                         uint8_t invalid_advertisements;
137                         bool tentative;
138                 };
139 
140                 /* ipv4 only */
141                 struct in_addr broadcast;
142         };
143 };
144 
145 enum odhcpd_mode {
146         MODE_DISABLED,
147         MODE_SERVER,
148         MODE_RELAY,
149         MODE_HYBRID
150 };
151 
152 
153 enum odhcpd_assignment_flags {
154         OAF_TENTATIVE           = (1 << 0),
155         OAF_BOUND               = (1 << 1),
156         OAF_STATIC              = (1 << 2),
157         OAF_BROKEN_HOSTNAME     = (1 << 3),
158         OAF_DHCPV4              = (1 << 4),
159         OAF_DHCPV6_NA           = (1 << 5),
160         OAF_DHCPV6_PD           = (1 << 6),
161 };
162 
163 struct config {
164         bool legacy;
165         bool main_dhcpv4;
166         char *dhcp_cb;
167         char *dhcp_statefile;
168         int log_level;
169 };
170 
171 
172 struct lease {
173         struct vlist_node node;
174         struct list_head assignments;
175         uint32_t ipaddr;
176         uint64_t hostid;
177         struct ether_addr mac;
178         uint16_t duid_len;
179         uint8_t *duid;
180         uint32_t leasetime;
181         char *hostname;
182 };
183 
184 enum {
185         LEASE_ATTR_IP,
186         LEASE_ATTR_MAC,
187         LEASE_ATTR_DUID,
188         LEASE_ATTR_HOSTID,
189         LEASE_ATTR_LEASETIME,
190         LEASE_ATTR_NAME,
191         LEASE_ATTR_MAX
192 };
193 
194 struct odhcpd_ref_ip;
195 
196 struct dhcp_assignment {
197         struct list_head head;
198         struct list_head lease_list;
199 
200         void (*dhcp_free_cb)(struct dhcp_assignment *a);
201 
202         struct interface *iface;
203         struct lease *lease;
204 
205         struct sockaddr_in6 peer;
206         time_t valid_until;
207         time_t preferred_until;
208 
209 #define fr_timer        reconf_timer
210         struct uloop_timeout reconf_timer;
211 #define accept_fr_nonce accept_reconf
212         bool accept_reconf;
213 #define fr_cnt          reconf_cnt
214         int reconf_cnt;
215         uint8_t key[16];
216         struct odhcpd_ref_ip *fr_ip;
217 
218         uint32_t addr;
219         union {
220                 uint64_t assigned_host_id;
221                 uint32_t assigned_subnet_id;
222         };
223         uint32_t iaid;
224         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
225 
226         struct odhcpd_ipaddr *managed;
227         ssize_t managed_size;
228         struct ustream_fd managed_sock;
229 
230         unsigned int flags;
231         uint32_t leasetime;
232         char *hostname;
233         char *reqopts;
234 #define hwaddr          mac
235         uint8_t mac[6];
236 
237         uint16_t clid_len;
238         uint8_t clid_data[];
239 };
240 
241 
242 struct interface {
243         struct avl_node avl;
244 
245         int ifflags;
246         int ifindex;
247         char *ifname;
248         const char *name;
249 
250         // IPv6 runtime data
251         struct odhcpd_ipaddr *addr6;
252         size_t addr6_len;
253         struct odhcpd_ipaddr *invalid_addr6;
254         size_t invalid_addr6_len;
255 
256         // RA runtime data
257         struct odhcpd_event router_event;
258         struct uloop_timeout timer_rs;
259         uint32_t ra_sent;
260 
261         // DHCPv6 runtime data
262         struct odhcpd_event dhcpv6_event;
263         struct list_head ia_assignments;
264 
265         // NDP runtime data
266         struct odhcpd_event ndp_event;
267         int ndp_ping_fd;
268 
269         // IPv4 runtime data
270         struct odhcpd_ipaddr *addr4;
271         size_t addr4_len;
272 
273         // DHCPv4 runtime data
274         struct odhcpd_event dhcpv4_event;
275         struct list_head dhcpv4_assignments;
276         struct list_head dhcpv4_fr_ips;
277 
278         // Managed PD
279         char dhcpv6_pd_manager[128];
280         struct in6_addr dhcpv6_pd_cer;
281 
282         // Services
283         enum odhcpd_mode ra;
284         enum odhcpd_mode dhcpv6;
285         enum odhcpd_mode ndp;
286         enum odhcpd_mode dhcpv4;
287 
288         // Config
289         bool inuse;
290         bool external;
291         bool master;
292         bool ignore;
293         bool always_rewrite_dns;
294         bool dns_service;
295 
296         // NDP
297         int learn_routes;
298 
299         // RA
300         uint8_t ra_flags;
301         bool ra_slaac;
302         bool ra_not_onlink;
303         bool ra_advrouter;
304         bool ra_useleasetime;
305         bool ra_dns;
306         uint8_t pref64_length;
307         struct in6_addr pref64_addr;
308         bool no_dynamic_dhcp;
309         bool have_link_local;
310         uint8_t pio_filter_length;
311         struct in6_addr pio_filter_addr;
312         int default_router;
313         int route_preference;
314         int ra_maxinterval;
315         int ra_mininterval;
316         int ra_lifetime;
317         uint32_t ra_reachabletime;
318         uint32_t ra_retranstime;
319         uint32_t ra_hoplimit;
320         int ra_mtu;
321         uint32_t preferred_lifetime;
322 
323         // DHCP
324         uint32_t dhcp_leasetime;
325 
326         // DHCPv4
327         struct in_addr dhcpv4_start;
328         struct in_addr dhcpv4_end;
329         struct in_addr dhcpv4_start_ip;
330         struct in_addr dhcpv4_end_ip;
331         struct in_addr dhcpv4_local;
332         struct in_addr dhcpv4_bcast;
333         struct in_addr dhcpv4_mask;
334         struct in_addr *dhcpv4_router;
335         size_t dhcpv4_router_cnt;
336         struct in_addr *dhcpv4_dns;
337         size_t dhcpv4_dns_cnt;
338         bool dhcpv4_forcereconf;
339 
340         // DNS
341         struct in6_addr *dns;
342         size_t dns_cnt;
343         uint8_t *search;
344         size_t search_len;
345 
346         // DHCPV6
347         void *dhcpv6_raw;
348         size_t dhcpv6_raw_len;
349         bool dhcpv6_assignall;
350         bool dhcpv6_pd;
351         bool dhcpv6_na;
352         uint32_t dhcpv6_hostid_len;
353         uint32_t dhcpv6_pd_min_len; // minimum delegated prefix length
354 
355         char *upstream;
356         size_t upstream_len;
357 
358         char *filter_class;
359 
360         // NTP
361         struct in_addr *dhcpv4_ntp;
362         size_t dhcpv4_ntp_cnt;
363         uint8_t *dhcpv6_ntp;
364         uint16_t dhcpv6_ntp_len;
365         size_t dhcpv6_ntp_cnt;
366 
367         // SNTP
368         struct in6_addr *dhcpv6_sntp;
369         size_t dhcpv6_sntp_cnt;
370 };
371 
372 extern struct avl_tree interfaces;
373 extern const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX];
374 
375 inline static void free_assignment(struct dhcp_assignment *a)
376 {
377         list_del(&a->head);
378         list_del(&a->lease_list);
379 
380         if (a->dhcp_free_cb)
381                 a->dhcp_free_cb(a);
382 
383         free(a->hostname);
384         free(a->reqopts);
385         free(a);
386 }
387 
388 inline static struct dhcp_assignment *alloc_assignment(size_t extra_len)
389 {
390         struct dhcp_assignment *a = calloc(1, sizeof(*a) + extra_len);
391 
392         if (!a)
393                 return NULL;
394 
395         INIT_LIST_HEAD(&a->head);
396         INIT_LIST_HEAD(&a->lease_list);
397 
398         return a;
399 }
400 
401 // Exported main functions
402 int odhcpd_register(struct odhcpd_event *event);
403 int odhcpd_deregister(struct odhcpd_event *event);
404 void odhcpd_process(struct odhcpd_event *event);
405 
406 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
407                 struct iovec *iov, size_t iov_len,
408                 const struct interface *iface);
409 int odhcpd_get_interface_dns_addr(const struct interface *iface,
410                 struct in6_addr *addr);
411 int odhcpd_get_interface_config(const char *ifname, const char *what);
412 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
413 int odhcpd_get_flags(const struct interface *iface);
414 struct interface* odhcpd_get_interface_by_index(int ifindex);
415 int odhcpd_urandom(void *data, size_t len);
416 
417 void odhcpd_run(void);
418 time_t odhcpd_time(void);
419 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
420 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
421 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
422 
423 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
424 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
425 
426 int odhcpd_netmask2bitlen(bool v6, void *mask);
427 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
428 bool odhcpd_valid_hostname(const char *name);
429 
430 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
431 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len);
432 struct lease *config_find_lease_by_mac(const uint8_t *mac);
433 struct lease *config_find_lease_by_hostid(const uint64_t hostid);
434 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr);
435 int set_lease_from_blobmsg(struct blob_attr *ba);
436 
437 #ifdef WITH_UBUS
438 int ubus_init(void);
439 const char* ubus_get_ifname(const char *name);
440 void ubus_apply_network(void);
441 bool ubus_has_prefix(const char *name, const char *ifname);
442 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
443                 const struct in_addr *addr, const char *name, const char *interface);
444 #endif
445 
446 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
447                 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
448 int dhcpv6_ia_init(void);
449 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable);
450 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c, time_t now,
451                                 dhcpv6_binding_cb_handler_t func, void *arg);
452 void dhcpv6_ia_write_statefile(void);
453 
454 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
455 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
456                 struct odhcpd_ipaddr **addrs);
457 ssize_t netlink_get_interface_linklocal(int ifindex, struct odhcpd_ipaddr **addrs);
458 int netlink_get_interface_proxy_neigh(int ifindex, const struct in6_addr *addr);
459 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
460                 const int ifindex, const struct in6_addr *gw,
461                 const uint32_t metric, const bool add);
462 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
463                 const int ifindex, const bool add);
464 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
465                 const int ifindex, const bool v6, const bool add);
466 void netlink_dump_neigh_table(const bool proxy);
467 void netlink_dump_addr_table(const bool v6);
468 
469 // Exported module initializers
470 int netlink_init(void);
471 int router_init(void);
472 int dhcpv6_init(void);
473 int ndp_init(void);
474 #ifdef DHCPV4_SUPPORT
475 int dhcpv4_init(void);
476 
477 int dhcpv4_setup_interface(struct interface *iface, bool enable);
478 void dhcpv4_handle_msg(void *addr, void *data, size_t len,
479                        struct interface *iface, _unused void *dest_addr,
480                        send_reply_cb_t send_reply, void *opaque);
481 #endif
482 int router_setup_interface(struct interface *iface, bool enable);
483 int dhcpv6_setup_interface(struct interface *iface, bool enable);
484 int ndp_setup_interface(struct interface *iface, bool enable);
485 void reload_services(struct interface *iface);
486 
487 void odhcpd_reload(void);
488 

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