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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 // RFC 6106 defines this router advertisement option
 30 #define ND_OPT_ROUTE_INFO 24
 31 #define ND_OPT_RECURSIVE_DNS 25
 32 #define ND_OPT_DNS_SEARCH 31
 33 
 34 #define INFINITE_VALID(x) ((x) == 0)
 35 
 36 #define _unused __attribute__((unused))
 37 #define _packed __attribute__((packed))
 38 
 39 #define ALL_IPV6_NODES "ff02::1"
 40 #define ALL_IPV6_ROUTERS "ff02::2"
 41 
 42 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
 43 
 44 struct interface;
 45 struct nl_sock;
 46 extern struct vlist_tree leases;
 47 
 48 struct odhcpd_event {
 49         struct uloop_fd uloop;
 50         void (*handle_dgram)(void *addr, void *data, size_t len,
 51                         struct interface *iface, void *dest_addr);
 52         void (*handle_error)(struct odhcpd_event *e, int error);
 53         void (*recv_msgs)(struct odhcpd_event *e);
 54 };
 55 
 56 typedef void (*dhcpv6_binding_cb_handler_t)(struct in6_addr *addr, int prefix,
 57                                             uint32_t pref, uint32_t valid,
 58                                             void *arg);
 59 
 60 union if_addr {
 61         struct in_addr in;
 62         struct in6_addr in6;
 63 };
 64 
 65 struct netevent_handler_info {
 66         struct interface *iface;
 67         union {
 68                 struct {
 69                         union if_addr dst;
 70                         uint8_t dst_len;
 71                         union if_addr gateway;
 72                 } rt;
 73                 struct {
 74                         union if_addr dst;
 75                         uint16_t state;
 76                         uint8_t flags;
 77                 } neigh;
 78                 struct {
 79                         struct odhcpd_ipaddr *addrs;
 80                         size_t len;
 81                 } addrs_old;
 82                 union if_addr addr;
 83         };
 84 };
 85 
 86 enum netevents {
 87         NETEV_IFINDEX_CHANGE,
 88         NETEV_ADDR_ADD,
 89         NETEV_ADDR_DEL,
 90         NETEV_ADDRLIST_CHANGE,
 91         NETEV_ADDR6_ADD,
 92         NETEV_ADDR6_DEL,
 93         NETEV_ADDR6LIST_CHANGE,
 94         NETEV_ROUTE6_ADD,
 95         NETEV_ROUTE6_DEL,
 96         NETEV_NEIGH6_ADD,
 97         NETEV_NEIGH6_DEL,
 98 };
 99 
100 struct netevent_handler {
101         struct list_head head;
102         void (*cb) (unsigned long event, struct netevent_handler_info *info);
103 };
104 
105 struct odhcpd_ipaddr {
106         union if_addr addr;
107         uint8_t prefix;
108         uint32_t preferred;
109         uint32_t valid;
110 
111         /* ipv6 only */
112         uint8_t dprefix;
113 
114         /* ipv4 only */
115         struct in_addr broadcast;
116 };
117 
118 enum odhcpd_mode {
119         MODE_DISABLED,
120         MODE_SERVER,
121         MODE_RELAY,
122         MODE_HYBRID
123 };
124 
125 
126 enum odhcpd_assignment_flags {
127         OAF_TENTATIVE           = (1 << 0),
128         OAF_BOUND               = (1 << 1),
129         OAF_STATIC              = (1 << 2),
130         OAF_BROKEN_HOSTNAME     = (1 << 3),
131         OAF_DHCPV4              = (1 << 4),
132         OAF_DHCPV6_NA           = (1 << 5),
133         OAF_DHCPV6_PD           = (1 << 6),
134 };
135 
136 struct config {
137         bool legacy;
138         bool main_dhcpv4;
139         char *dhcp_cb;
140         char *dhcp_statefile;
141         int log_level;
142 } config;
143 
144 
145 struct lease {
146         struct vlist_node node;
147         struct list_head assignments;
148         uint32_t ipaddr;
149         uint32_t hostid;
150         struct ether_addr mac;
151         uint16_t duid_len;
152         uint8_t *duid;
153         uint32_t leasetime;
154         char *hostname;
155 };
156 
157 
158 struct odhcpd_ref_ip;
159 
160 struct dhcp_assignment {
161         struct list_head head;
162         struct list_head lease_list;
163 
164         void (*dhcp_free_cb)(struct dhcp_assignment *a);
165 
166         struct interface *iface;
167         struct lease *lease;
168 
169         struct sockaddr_in6 peer;
170         time_t valid_until;
171 
172 #define fr_timer        reconf_timer
173         struct uloop_timeout reconf_timer;
174 #define accept_fr_nonce accept_reconf
175         bool accept_reconf;
176 #define fr_cnt          reconf_cnt
177         int reconf_cnt;
178         uint8_t key[16];
179         struct odhcpd_ref_ip *fr_ip;
180 
181         uint32_t addr;
182         uint32_t assigned;
183         uint32_t iaid;
184         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
185 
186         struct odhcpd_ipaddr *managed;
187         ssize_t managed_size;
188         struct ustream_fd managed_sock;
189 
190         unsigned int flags;
191         uint32_t leasetime;
192         char *hostname;
193         char *reqopts;
194 #define hwaddr          mac
195         uint8_t mac[6];
196 
197         uint16_t clid_len;
198         uint8_t clid_data[];
199 };
200 
201 
202 struct interface {
203         struct avl_node avl;
204 
205         int ifindex;
206         char *ifname;
207         const char *name;
208 
209         // IPv6 runtime data
210         struct odhcpd_ipaddr *addr6;
211         size_t addr6_len;
212 
213         // RA runtime data
214         struct odhcpd_event router_event;
215         struct uloop_timeout timer_rs;
216         uint32_t ra_sent;
217 
218         // DHCPv6 runtime data
219         struct odhcpd_event dhcpv6_event;
220         struct list_head ia_assignments;
221 
222         // NDP runtime data
223         struct odhcpd_event ndp_event;
224         int ndp_ping_fd;
225 
226         // IPv4 runtime data
227         struct odhcpd_ipaddr *addr4;
228         size_t addr4_len;
229 
230         // DHCPv4 runtime data
231         struct odhcpd_event dhcpv4_event;
232         struct list_head dhcpv4_assignments;
233         struct list_head dhcpv4_fr_ips;
234 
235         // Managed PD
236         char dhcpv6_pd_manager[128];
237         struct in6_addr dhcpv6_pd_cer;
238 
239         // Services
240         enum odhcpd_mode ra;
241         enum odhcpd_mode dhcpv6;
242         enum odhcpd_mode ndp;
243         enum odhcpd_mode dhcpv4;
244 
245         // Config
246         bool inuse;
247         bool external;
248         bool master;
249         bool ignore;
250         bool always_rewrite_dns;
251 
252         // NDP
253         int learn_routes;
254 
255         // RA
256         uint8_t ra_flags;
257         bool ra_slaac;
258         bool ra_not_onlink;
259         bool ra_advrouter;
260         bool ra_useleasetime;
261         bool ra_dns;
262         bool no_dynamic_dhcp;
263         uint8_t pio_filter_length;
264         struct in6_addr pio_filter_addr;
265         int default_router;
266         int route_preference;
267         int ra_maxinterval;
268         int ra_mininterval;
269         int ra_lifetime;
270         uint32_t ra_reachabletime;
271         uint32_t ra_retranstime;
272         uint32_t ra_hoplimit;
273         int ra_mtu;
274 
275         // DHCP
276         uint32_t dhcp_leasetime;
277 
278         // DHCPv4
279         struct in_addr dhcpv4_start;
280         struct in_addr dhcpv4_end;
281         struct in_addr dhcpv4_start_ip;
282         struct in_addr dhcpv4_end_ip;
283         struct in_addr dhcpv4_local;
284         struct in_addr dhcpv4_bcast;
285         struct in_addr dhcpv4_mask;
286         struct in_addr *dhcpv4_router;
287         size_t dhcpv4_router_cnt;
288         struct in_addr *dhcpv4_dns;
289         size_t dhcpv4_dns_cnt;
290         bool dhcpv4_forcereconf;
291 
292         // DNS
293         struct in6_addr *dns;
294         size_t dns_cnt;
295         uint8_t *search;
296         size_t search_len;
297 
298         // DHCPV6
299         void *dhcpv6_raw;
300         size_t dhcpv6_raw_len;
301         bool dhcpv6_assignall;
302         bool dhcpv6_pd;
303         bool dhcpv6_na;
304 
305         char *upstream;
306         size_t upstream_len;
307 
308         char *filter_class;
309 };
310 
311 extern struct avl_tree interfaces;
312 
313 inline static void free_assignment(struct dhcp_assignment *a)
314 {
315         list_del(&a->head);
316         list_del(&a->lease_list);
317 
318         if (a->dhcp_free_cb)
319                 a->dhcp_free_cb(a);
320 
321         free(a->hostname);
322         free(a->reqopts);
323         free(a);
324 }
325 
326 inline static struct dhcp_assignment *alloc_assignment(size_t extra_len)
327 {
328         struct dhcp_assignment *a = calloc(1, sizeof(*a) + extra_len);
329 
330         if (!a)
331                 return NULL;
332 
333         INIT_LIST_HEAD(&a->head);
334         INIT_LIST_HEAD(&a->lease_list);
335 
336         return a;
337 }
338 
339 // Exported main functions
340 int odhcpd_register(struct odhcpd_event *event);
341 int odhcpd_deregister(struct odhcpd_event *event);
342 void odhcpd_process(struct odhcpd_event *event);
343 
344 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
345                 struct iovec *iov, size_t iov_len,
346                 const struct interface *iface);
347 int odhcpd_get_interface_dns_addr(const struct interface *iface,
348                 struct in6_addr *addr);
349 int odhcpd_get_interface_config(const char *ifname, const char *what);
350 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
351 struct interface* odhcpd_get_interface_by_index(int ifindex);
352 int odhcpd_urandom(void *data, size_t len);
353 
354 void odhcpd_run(void);
355 time_t odhcpd_time(void);
356 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
357 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
358 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
359 
360 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
361 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
362 
363 int odhcpd_netmask2bitlen(bool v6, void *mask);
364 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
365 bool odhcpd_valid_hostname(const char *name);
366 
367 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
368 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len);
369 struct lease *config_find_lease_by_mac(const uint8_t *mac);
370 struct lease *config_find_lease_by_hostid(const uint32_t hostid);
371 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr);
372 
373 #ifdef WITH_UBUS
374 int ubus_init(void);
375 const char* ubus_get_ifname(const char *name);
376 void ubus_apply_network(void);
377 bool ubus_has_prefix(const char *name, const char *ifname);
378 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
379                 const struct in_addr *addr, const char *name, const char *interface);
380 #endif
381 
382 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
383                 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
384 int dhcpv6_ia_init(void);
385 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable);
386 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c, time_t now,
387                                 dhcpv6_binding_cb_handler_t func, void *arg);
388 void dhcpv6_ia_write_statefile(void);
389 
390 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
391 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
392                 struct odhcpd_ipaddr **addrs);
393 int netlink_get_interface_proxy_neigh(int ifindex, const struct in6_addr *addr);
394 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
395                 const int ifindex, const struct in6_addr *gw,
396                 const uint32_t metric, const bool add);
397 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
398                 const int ifindex, const bool add);
399 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
400                 const int ifindex, const bool v6, const bool add);
401 void netlink_dump_neigh_table(const bool proxy);
402 void netlink_dump_addr_table(const bool v6);
403 
404 // Exported module initializers
405 int netlink_init(void);
406 int router_init(void);
407 int dhcpv6_init(void);
408 int ndp_init(void);
409 #ifdef DHCPV4_SUPPORT
410 int dhcpv4_init(void);
411 
412 int dhcpv4_setup_interface(struct interface *iface, bool enable);
413 #endif
414 int router_setup_interface(struct interface *iface, bool enable);
415 int dhcpv6_setup_interface(struct interface *iface, bool enable);
416 int ndp_setup_interface(struct interface *iface, bool enable);
417 
418 void odhcpd_reload(void);
419 

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