projects / project / odhcpd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
config: set RFC defaults for preferred lifetime
[project/odhcpd.git] / src / config.c
1 #include <fcntl.h>
2 #include <resolv.h>
3 #include <signal.h>
4 #include <arpa/inet.h>
5 #include <unistd.h>
6 #include <libgen.h>
7 #include <net/if.h>
8 #include <string.h>
9 #include <sys/stat.h>
10 #include <syslog.h>
11
12 #include <uci.h>
13 #include <uci_blob.h>
14 #include <libubox/utils.h>
15 #include <libubox/avl.h>
16 #include <libubox/avl-cmp.h>
17 #include <libubox/list.h>
18 #include <libubox/vlist.h>
19
20 #include "odhcpd.h"
21
22 static struct blob_buf b;
23 static int reload_pipe[2] = { -1, -1 };
24
25 static int lease_cmp(const void *k1, const void *k2, void *ptr);
26 static void lease_update(struct vlist_tree *tree, struct vlist_node *node_new,
27 struct vlist_node *node_old);
28
29 struct vlist_tree leases = VLIST_TREE_INIT(leases, lease_cmp, lease_update, true, false);
30 AVL_TREE(interfaces, avl_strcmp, false, NULL);
31 struct config config = {.legacy = false, .main_dhcpv4 = false,
32 .dhcp_cb = NULL, .dhcp_statefile = NULL, .dhcp_hostsfile = NULL,
33 .log_level = LOG_WARNING};
34
35 #define START_DEFAULT 100
36 #define LIMIT_DEFAULT 150
37
38 #define HOSTID_LEN_MIN 12
39 #define HOSTID_LEN_MAX 64
40 #define HOSTID_LEN_DEFAULT HOSTID_LEN_MIN
41
42 #define PD_MIN_LEN_MAX (64-2) // must delegate at least 2 bits of prefix
43
44 #define OAF_DHCPV6 (OAF_DHCPV6_NA | OAF_DHCPV6_PD)
45
46 enum {
47 IFACE_ATTR_INTERFACE,
48 IFACE_ATTR_IFNAME,
49 IFACE_ATTR_NETWORKID,
50 IFACE_ATTR_DYNAMICDHCP,
51 IFACE_ATTR_LEASETIME,
52 IFACE_ATTR_LIMIT,
53 IFACE_ATTR_START,
54 IFACE_ATTR_MASTER,
55 IFACE_ATTR_UPSTREAM,
56 IFACE_ATTR_RA,
57 IFACE_ATTR_DHCPV4,
58 IFACE_ATTR_DHCPV6,
59 IFACE_ATTR_NDP,
60 IFACE_ATTR_ROUTER,
61 IFACE_ATTR_DNS,
62 IFACE_ATTR_DNS_SERVICE,
63 IFACE_ATTR_DOMAIN,
64 IFACE_ATTR_FILTER_CLASS,
65 IFACE_ATTR_DHCPV4_FORCERECONF,
66 IFACE_ATTR_DHCPV6_RAW,
67 IFACE_ATTR_DHCPV6_ASSIGNALL,
68 IFACE_ATTR_DHCPV6_PD,
69 IFACE_ATTR_DHCPV6_PD_MIN_LEN,
70 IFACE_ATTR_DHCPV6_NA,
71 IFACE_ATTR_DHCPV6_HOSTID_LEN,
72 IFACE_ATTR_RA_DEFAULT,
73 IFACE_ATTR_RA_MANAGEMENT,
74 IFACE_ATTR_RA_FLAGS,
75 IFACE_ATTR_RA_SLAAC,
76 IFACE_ATTR_RA_OFFLINK,
77 IFACE_ATTR_RA_PREFERENCE,
78 IFACE_ATTR_RA_ADVROUTER,
79 IFACE_ATTR_RA_MININTERVAL,
80 IFACE_ATTR_RA_MAXINTERVAL,
81 IFACE_ATTR_RA_LIFETIME,
82 IFACE_ATTR_RA_USELEASETIME,
83 IFACE_ATTR_RA_REACHABLETIME,
84 IFACE_ATTR_RA_RETRANSTIME,
85 IFACE_ATTR_RA_HOPLIMIT,
86 IFACE_ATTR_RA_MTU,
87 IFACE_ATTR_RA_DNS,
88 IFACE_ATTR_RA_PREF64,
89 IFACE_ATTR_PD_MANAGER,
90 IFACE_ATTR_PD_CER,
91 IFACE_ATTR_NDPROXY_ROUTING,
92 IFACE_ATTR_NDPROXY_SLAVE,
93 IFACE_ATTR_PREFIX_FILTER,
94 IFACE_ATTR_PREFERRED_LIFETIME,
95 IFACE_ATTR_NTP,
96 IFACE_ATTR_MAX
97 };
98
99 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
100 [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
101 [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
102 [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
103 [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
104 [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
105 [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
106 [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
107 [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
108 [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
109 [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
110 [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
111 [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
112 [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
113 [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
114 [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
115 [IFACE_ATTR_DNS_SERVICE] = { .name = "dns_service", .type = BLOBMSG_TYPE_BOOL },
116 [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
117 [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
118 [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
119 [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
120 [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
121 [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
122 [IFACE_ATTR_DHCPV6_PD_MIN_LEN] = { .name = "dhcpv6_pd_min_len", .type = BLOBMSG_TYPE_INT32 },
123 [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
124 [IFACE_ATTR_DHCPV6_HOSTID_LEN] = { .name = "dhcpv6_hostidlength", .type = BLOBMSG_TYPE_INT32 },
125 [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
126 [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
127 [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
128 [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
129 [IFACE_ATTR_RA_FLAGS] = { .name = "ra_flags", . type = BLOBMSG_TYPE_ARRAY },
130 [IFACE_ATTR_RA_SLAAC] = { .name = "ra_slaac", .type = BLOBMSG_TYPE_BOOL },
131 [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
132 [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
133 [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
134 [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
135 [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
136 [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
137 [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
138 [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
139 [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
140 [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
141 [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
142 [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
143 [IFACE_ATTR_RA_PREF64] = { .name = "ra_pref64", .type = BLOBMSG_TYPE_STRING },
144 [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
145 [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
146 [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
147 [IFACE_ATTR_PREFERRED_LIFETIME] = { .name = "preferred_lifetime", .type = BLOBMSG_TYPE_STRING },
148 [IFACE_ATTR_NTP] = { .name = "ntp", .type = BLOBMSG_TYPE_ARRAY },
149 };
150
151 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
152 [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
153 [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
154 [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
155 };
156
157 const struct uci_blob_param_list interface_attr_list = {
158 .n_params = IFACE_ATTR_MAX,
159 .params = iface_attrs,
160 .info = iface_attr_info,
161 };
162
163 const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
164 [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
165 [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
166 [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
167 [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
168 [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
169 [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
170 };
171
172 const struct uci_blob_param_list lease_attr_list = {
173 .n_params = LEASE_ATTR_MAX,
174 .params = lease_attrs,
175 };
176
177 enum {
178 ODHCPD_ATTR_LEGACY,
179 ODHCPD_ATTR_MAINDHCP,
180 ODHCPD_ATTR_LEASEFILE,
181 ODHCPD_ATTR_LEASETRIGGER,
182 ODHCPD_ATTR_LOGLEVEL,
183 ODHCPD_ATTR_HOSTSFILE,
184 ODHCPD_ATTR_MAX
185 };
186
187 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
188 [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
189 [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
190 [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
191 [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
192 [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
193 [ODHCPD_ATTR_HOSTSFILE] = { .name = "hostsfile", .type = BLOBMSG_TYPE_STRING },
194 };
195
196 const struct uci_blob_param_list odhcpd_attr_list = {
197 .n_params = ODHCPD_ATTR_MAX,
198 .params = odhcpd_attrs,
199 };
200
201 static const struct { const char *name; uint8_t flag; } ra_flags[] = {
202 { .name = "managed-config", .flag = ND_RA_FLAG_MANAGED },
203 { .name = "other-config", .flag = ND_RA_FLAG_OTHER },
204 { .name = "home-agent", .flag = ND_RA_FLAG_HOME_AGENT },
205 { .name = "none", . flag = 0 },
206 { .name = NULL, },
207 };
208
209 static void set_interface_defaults(struct interface *iface)
210 {
211 iface->ignore = true;
212 iface->dhcpv4 = MODE_DISABLED;
213 iface->dhcpv6 = MODE_DISABLED;
214 iface->ra = MODE_DISABLED;
215 iface->ndp = MODE_DISABLED;
216 iface->learn_routes = 1;
217 iface->dhcp_leasetime = 43200;
218 iface->preferred_lifetime = 604800; /* rfc4861#section-6.2.1: AdvPreferredLifetime 7 days */
219 iface->dhcpv4_start.s_addr = htonl(START_DEFAULT);
220 iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
221 iface->dhcpv6_assignall = true;
222 iface->dhcpv6_pd = true;
223 iface->dhcpv6_pd_min_len = 0;
224 iface->dhcpv6_na = true;
225 iface->dhcpv6_hostid_len = HOSTID_LEN_DEFAULT;
226 iface->dns_service = true;
227 iface->ra_flags = ND_RA_FLAG_OTHER;
228 iface->ra_slaac = true;
229 iface->ra_maxinterval = 600;
230 iface->ra_mininterval = iface->ra_maxinterval/3;
231 iface->ra_lifetime = -1;
232 iface->ra_dns = true;
233 }
234
235 static void clean_interface(struct interface *iface)
236 {
237 free(iface->dns);
238 free(iface->search);
239 free(iface->upstream);
240 free(iface->dhcpv4_router);
241 free(iface->dhcpv4_dns);
242 free(iface->dhcpv6_raw);
243 free(iface->filter_class);
244 free(iface->dhcpv4_ntp);
245 free(iface->dhcpv6_ntp);
246 free(iface->dhcpv6_sntp);
247 memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
248 set_interface_defaults(iface);
249 }
250
251 static void close_interface(struct interface *iface)
252 {
253 avl_delete(&interfaces, &iface->avl);
254
255 router_setup_interface(iface, false);
256 dhcpv6_setup_interface(iface, false);
257 ndp_setup_interface(iface, false);
258 #ifdef DHCPV4_SUPPORT
259 dhcpv4_setup_interface(iface, false);
260 #endif
261
262 /* make sure timer is not on the timeouts list before freeing */
263 uloop_timeout_cancel(&iface->timer_rs);
264
265 clean_interface(iface);
266 free(iface->addr4);
267 free(iface->addr6);
268 free(iface->invalid_addr6);
269 free(iface->ifname);
270 free(iface);
271 }
272
273 static int parse_mode(const char *mode)
274 {
275 if (!strcmp(mode, "disabled"))
276 return MODE_DISABLED;
277 else if (!strcmp(mode, "server"))
278 return MODE_SERVER;
279 else if (!strcmp(mode, "relay"))
280 return MODE_RELAY;
281 else if (!strcmp(mode, "hybrid"))
282 return MODE_HYBRID;
283 else
284 return -1;
285 }
286
287 static int parse_ra_flags(uint8_t *flags, struct blob_attr *attr)
288 {
289 struct blob_attr *cur;
290 unsigned rem;
291
292 blobmsg_for_each_attr(cur, attr, rem) {
293 int i;
294
295 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
296 continue;
297
298 if (!blobmsg_check_attr(cur, false))
299 continue;
300
301 for (i = 0; ra_flags[i].name; i++) {
302 if (!strcmp(ra_flags[i].name, blobmsg_get_string(cur))) {
303 *flags |= ra_flags[i].flag;
304 break;
305 }
306 }
307
308 if (!ra_flags[i].name)
309 return -1;
310 }
311
312 return 0;
313 }
314
315 static void set_config(struct uci_section *s)
316 {
317 struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
318
319 blob_buf_init(&b, 0);
320 uci_to_blob(&b, s, &odhcpd_attr_list);
321 blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
322
323 if ((c = tb[ODHCPD_ATTR_LEGACY]))
324 config.legacy = blobmsg_get_bool(c);
325
326 if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
327 config.main_dhcpv4 = blobmsg_get_bool(c);
328
329 if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
330 free(config.dhcp_statefile);
331 config.dhcp_statefile = strdup(blobmsg_get_string(c));
332 }
333
334 if ((c = tb[ODHCPD_ATTR_HOSTSFILE])) {
335 free(config.dhcp_hostsfile);
336 config.dhcp_hostsfile = strdup(blobmsg_get_string(c));
337 }
338
339 if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
340 free(config.dhcp_cb);
341 config.dhcp_cb = strdup(blobmsg_get_string(c));
342 }
343
344 if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
345 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
346
347 if (config.log_level != log_level) {
348 config.log_level = log_level;
349 setlogmask(LOG_UPTO(config.log_level));
350 }
351 }
352 }
353
354 static double parse_leasetime(struct blob_attr *c) {
355 char *val = blobmsg_get_string(c), *endptr = NULL;
356 double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
357
358 if (time && endptr && endptr[0]) {
359 if (endptr[0] == 's')
360 time *= 1;
361 else if (endptr[0] == 'm')
362 time *= 60;
363 else if (endptr[0] == 'h')
364 time *= 3600;
365 else if (endptr[0] == 'd')
366 time *= 24 * 3600;
367 else if (endptr[0] == 'w')
368 time *= 7 * 24 * 3600;
369 else
370 goto err;
371 }
372
373 if (time < 60)
374 time = 60;
375
376 return time;
377
378 err:
379 return -1;
380 }
381
382 static void free_lease(struct lease *l)
383 {
384 free(l->hostname);
385 free(l);
386 }
387
388
389 int set_lease_from_blobmsg(struct blob_attr *ba)
390 {
391 struct blob_attr *tb[LEASE_ATTR_MAX], *c;
392 struct lease *l;
393 size_t duidlen = 0;
394 uint8_t *duid;
395
396 blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(ba), blob_len(ba));
397
398 if ((c = tb[LEASE_ATTR_DUID]))
399 duidlen = (blobmsg_data_len(c) - 1) / 2;
400
401 l = calloc_a(sizeof(*l), &duid, duidlen);
402 if (!l)
403 goto err;
404
405 if ((c = tb[LEASE_ATTR_MAC]))
406 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
407 goto err;
408
409 if ((c = tb[LEASE_ATTR_DUID])) {
410 ssize_t len;
411
412 l->duid = duid;
413 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
414
415 if (len < 0)
416 goto err;
417
418 l->duid_len = len;
419 }
420
421 if ((c = tb[LEASE_ATTR_NAME])) {
422 l->hostname = strdup(blobmsg_get_string(c));
423 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
424 goto err;
425 }
426
427 if ((c = tb[LEASE_ATTR_IP]))
428 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
429 goto err;
430
431 if ((c = tb[LEASE_ATTR_HOSTID])) {
432 errno = 0;
433 l->hostid = strtoull(blobmsg_get_string(c), NULL, 16);
434 if (errno)
435 goto err;
436 } else {
437 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
438 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
439 }
440
441 if ((c = tb[LEASE_ATTR_LEASETIME])) {
442 double time = parse_leasetime(c);
443 if (time < 0)
444 goto err;
445
446 l->leasetime = time;
447 }
448
449 INIT_LIST_HEAD(&l->assignments);
450 vlist_add(&leases, &l->node, l);
451 return 0;
452
453 err:
454 if (l)
455 free_lease(l);
456
457 return -1;
458 }
459
460 static int set_lease_from_uci(struct uci_section *s)
461 {
462 blob_buf_init(&b, 0);
463 uci_to_blob(&b, s, &lease_attr_list);
464
465 return set_lease_from_blobmsg(b.head);
466 }
467
468 /* Parse NTP Options for DHCPv6 Address */
469 static int parse_ntp_options(uint16_t *dhcpv6_ntp_len, struct in6_addr addr6, uint8_t **dhcpv6_ntp)
470 {
471 uint16_t sub_opt = 0, sub_len = htons(IPV6_ADDR_LEN);
472 uint16_t ntp_len = IPV6_ADDR_LEN + 4;
473 uint8_t *ntp = *dhcpv6_ntp;
474 size_t pos = *dhcpv6_ntp_len;
475
476 ntp = realloc(ntp, pos + ntp_len);
477 if (!ntp)
478 return -1;
479
480 *dhcpv6_ntp = ntp;
481
482 if (IN6_IS_ADDR_MULTICAST(&addr6))
483 sub_opt = htons(NTP_SUBOPTION_MC_ADDR);
484 else
485 sub_opt = htons(NTP_SUBOPTION_SRV_ADDR);
486
487 memcpy(ntp + pos, &sub_opt, sizeof(sub_opt));
488 pos += sizeof(sub_opt);
489 memcpy(ntp + pos, &sub_len, sizeof(sub_len));
490 pos += sizeof(sub_len);
491 memcpy(ntp + pos, &addr6, IPV6_ADDR_LEN);
492
493 *dhcpv6_ntp_len += ntp_len;
494
495 return 0;
496 }
497
498 /* Parse NTP Options for FQDN */
499 static int parse_ntp_fqdn(uint16_t *dhcpv6_ntp_len, char *fqdn, uint8_t **dhcpv6_ntp)
500 {
501 size_t fqdn_len = strlen(fqdn);
502 uint16_t sub_opt = 0, sub_len = 0, ntp_len = 0;
503 uint8_t *ntp = *dhcpv6_ntp;
504 size_t pos = *dhcpv6_ntp_len;
505 uint8_t buf[256] = {0};
506
507 if (fqdn_len > 0 && fqdn[fqdn_len - 1] == '.')
508 fqdn[fqdn_len - 1] = 0;
509
510 int len = dn_comp(fqdn, buf, sizeof(buf), NULL, NULL);
511 if (len <= 0)
512 return -1;
513
514 ntp_len = len + 4;
515
516 ntp = realloc(ntp, pos + ntp_len);
517 if (!ntp)
518 return -1;
519
520 *dhcpv6_ntp = ntp;
521
522 sub_opt = htons(NTP_SUBOPTION_SRV_FQDN);
523 sub_len = htons(len);
524
525 memcpy(ntp + pos, &sub_opt, sizeof(sub_opt));
526 pos += sizeof(sub_opt);
527 memcpy(ntp + pos, &sub_len, sizeof(sub_len));
528 pos += sizeof(sub_len);
529 memcpy(ntp + pos, buf, len);
530
531 *dhcpv6_ntp_len += ntp_len;
532
533 return 0;
534 }
535
536 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
537 {
538 struct odhcpd_ipaddr *addrs = NULL;
539 struct interface *iface;
540 struct blob_attr *tb[IFACE_ATTR_MAX], *c;
541 ssize_t addrs_len;
542 bool get_addrs = false;
543 int mode;
544 const char *ifname = NULL;
545
546 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
547
548 if (tb[IFACE_ATTR_INTERFACE])
549 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
550
551 if (!name)
552 return -1;
553
554 iface = avl_find_element(&interfaces, name, iface, avl);
555 if (!iface) {
556 char *new_name;
557
558 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
559 if (!iface)
560 return -1;
561
562 iface->name = strcpy(new_name, name);
563 iface->avl.key = iface->name;
564 iface->router_event.uloop.fd = -1;
565 iface->dhcpv6_event.uloop.fd = -1;
566 iface->ndp_event.uloop.fd = -1;
567 iface->ndp_ping_fd = -1;
568 iface->dhcpv4_event.uloop.fd = -1;
569 INIT_LIST_HEAD(&iface->ia_assignments);
570 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
571 INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
572
573 set_interface_defaults(iface);
574
575 avl_insert(&interfaces, &iface->avl);
576 get_addrs = overwrite = true;
577 }
578
579 if (overwrite) {
580 if ((c = tb[IFACE_ATTR_IFNAME]))
581 ifname = blobmsg_get_string(c);
582 else if ((c = tb[IFACE_ATTR_NETWORKID]))
583 ifname = blobmsg_get_string(c);
584 }
585
586 #ifdef WITH_UBUS
587 if (overwrite || !iface->ifname)
588 ifname = ubus_get_ifname(name);
589 #endif
590
591 if (!iface->ifname && !ifname)
592 goto err;
593
594 if (ifname) {
595 free(iface->ifname);
596 iface->ifname = strdup(ifname);
597
598 if (!iface->ifname)
599 goto err;
600
601 if (!iface->ifindex &&
602 (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
603 goto err;
604
605 if ((iface->ifflags = odhcpd_get_flags(iface)) < 0)
606 goto err;
607 }
608
609 if (get_addrs) {
610 addrs_len = netlink_get_interface_addrs(iface->ifindex,
611 true, &iface->addr6);
612
613 if (addrs_len > 0)
614 iface->addr6_len = addrs_len;
615
616 addrs_len = netlink_get_interface_addrs(iface->ifindex,
617 false, &iface->addr4);
618 if (addrs_len > 0)
619 iface->addr4_len = addrs_len;
620 }
621
622 addrs_len = netlink_get_interface_linklocal(iface->ifindex, &addrs);
623 if (addrs_len > 0) {
624 for (ssize_t i = 0; i < addrs_len; i++) {
625 struct odhcpd_ipaddr *addr = &addrs[i];
626
627 if (!addr->tentative) {
628 iface->have_link_local = true;
629 break;
630 }
631 }
632 }
633
634 iface->inuse = true;
635
636 if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
637 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
638
639 if ((c = tb[IFACE_ATTR_LEASETIME])) {
640 double time = parse_leasetime(c);
641
642 if (time >= 0)
643 iface->dhcp_leasetime = time;
644 else
645 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
646 iface_attrs[IFACE_ATTR_LEASETIME].name, iface->name);
647
648 }
649
650 if ((c = tb[IFACE_ATTR_PREFERRED_LIFETIME])) {
651 double time = parse_leasetime(c);
652
653 if (time >= 0)
654 iface->preferred_lifetime = time;
655 else
656 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
657 iface_attrs[IFACE_ATTR_PREFERRED_LIFETIME].name, iface->name);
658
659 }
660
661 if ((c = tb[IFACE_ATTR_START])) {
662 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
663 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
664 LIMIT_DEFAULT - 1);
665
666 if (config.main_dhcpv4 && config.legacy)
667 iface->dhcpv4 = MODE_SERVER;
668 }
669
670 if ((c = tb[IFACE_ATTR_LIMIT]))
671 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
672 blobmsg_get_u32(c) - 1);
673
674 if ((c = tb[IFACE_ATTR_MASTER]))
675 iface->master = blobmsg_get_bool(c);
676
677 if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
678 struct blob_attr *cur;
679 unsigned rem;
680
681 blobmsg_for_each_attr(cur, c, rem) {
682 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
683 continue;
684
685 iface->upstream = realloc(iface->upstream,
686 iface->upstream_len + blobmsg_data_len(cur));
687 if (!iface->upstream)
688 goto err;
689
690 memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
691 iface->upstream_len += blobmsg_data_len(cur);
692 }
693 }
694
695 if ((c = tb[IFACE_ATTR_RA])) {
696 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
697 iface->ra = mode;
698
699 if (iface->ra != MODE_DISABLED)
700 iface->ignore = false;
701 } else
702 syslog(LOG_ERR, "Invalid %s mode configured for interface '%s'",
703 iface_attrs[IFACE_ATTR_RA].name, iface->name);
704 }
705
706 if ((c = tb[IFACE_ATTR_DHCPV4])) {
707 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
708 if (config.main_dhcpv4) {
709 iface->dhcpv4 = mode;
710
711 if (iface->dhcpv4 != MODE_DISABLED)
712 iface->ignore = false;
713 }
714 } else
715 syslog(LOG_ERR, "Invalid %s mode configured for interface %s",
716 iface_attrs[IFACE_ATTR_DHCPV4].name, iface->name);
717 }
718
719 if ((c = tb[IFACE_ATTR_DHCPV6])) {
720 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
721 iface->dhcpv6 = mode;
722
723 if (iface->dhcpv6 != MODE_DISABLED)
724 iface->ignore = false;
725 } else
726 syslog(LOG_ERR, "Invalid %s mode configured for interface '%s'",
727 iface_attrs[IFACE_ATTR_DHCPV6].name, iface->name);
728 }
729
730 if ((c = tb[IFACE_ATTR_NDP])) {
731 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
732 iface->ndp = mode;
733
734 if (iface->ndp != MODE_DISABLED)
735 iface->ignore = false;
736 } else
737 syslog(LOG_ERR, "Invalid %s mode configured for interface '%s'",
738 iface_attrs[IFACE_ATTR_NDP].name, iface->name);
739 }
740
741 if ((c = tb[IFACE_ATTR_ROUTER])) {
742 struct blob_attr *cur;
743 unsigned rem;
744
745 blobmsg_for_each_attr(cur, c, rem) {
746 struct in_addr addr4;
747
748 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
749 continue;
750
751 if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
752 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
753 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
754 if (!iface->dhcpv4_router)
755 goto err;
756
757 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
758 } else
759 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
760 iface_attrs[IFACE_ATTR_ROUTER].name, iface->name);
761 }
762 }
763
764 if ((c = tb[IFACE_ATTR_DNS])) {
765 struct blob_attr *cur;
766 unsigned rem;
767
768 iface->always_rewrite_dns = true;
769 blobmsg_for_each_attr(cur, c, rem) {
770 struct in_addr addr4;
771 struct in6_addr addr6;
772
773 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
774 continue;
775
776 if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
777 if (addr4.s_addr == INADDR_ANY) {
778 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
779 iface_attrs[IFACE_ATTR_DNS].name, iface->name);
780
781 continue;
782 }
783
784 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
785 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
786 if (!iface->dhcpv4_dns)
787 goto err;
788
789 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
790 } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
791 if (IN6_IS_ADDR_UNSPECIFIED(&addr6)) {
792 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
793 iface_attrs[IFACE_ATTR_DNS].name, iface->name);
794
795 continue;
796 }
797
798 iface->dns = realloc(iface->dns,
799 (++iface->dns_cnt) * sizeof(*iface->dns));
800 if (!iface->dns)
801 goto err;
802
803 iface->dns[iface->dns_cnt - 1] = addr6;
804 } else
805 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
806 iface_attrs[IFACE_ATTR_DNS].name, iface->name);
807 }
808 }
809
810 if ((c = tb[IFACE_ATTR_DNS_SERVICE]))
811 iface->dns_service = blobmsg_get_bool(c);
812
813 if ((c = tb[IFACE_ATTR_DOMAIN])) {
814 struct blob_attr *cur;
815 unsigned rem;
816
817 blobmsg_for_each_attr(cur, c, rem) {
818 uint8_t buf[256];
819 char *domain = blobmsg_get_string(cur);
820 size_t domainlen = strlen(domain);
821 int len;
822
823 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
824 continue;
825
826 domain = blobmsg_get_string(cur);
827 domainlen = strlen(domain);
828
829 if (domainlen > 0 && domain[domainlen - 1] == '.')
830 domain[domainlen - 1] = 0;
831
832 len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
833 if (len <= 0) {
834 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
835 iface_attrs[IFACE_ATTR_DOMAIN].name, iface->name);
836
837 continue;
838 }
839
840 iface->search = realloc(iface->search, iface->search_len + len);
841 if (!iface->search)
842 goto err;
843
844 memcpy(&iface->search[iface->search_len], buf, len);
845 iface->search_len += len;
846 }
847 }
848
849 if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
850 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
851 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
852 }
853
854 if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
855 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
856
857 if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
858 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
859 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
860 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
861 }
862
863 if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
864 iface->dhcpv6_assignall = blobmsg_get_bool(c);
865
866 if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
867 iface->dhcpv6_pd = blobmsg_get_bool(c);
868
869 if ((c = tb[IFACE_ATTR_DHCPV6_PD_MIN_LEN])) {
870 uint32_t pd_min_len = blobmsg_get_u32(c);
871 if (pd_min_len != 0 && pd_min_len <= PD_MIN_LEN_MAX)
872 iface->dhcpv6_pd_min_len = pd_min_len;
873 else
874 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
875 iface_attrs[IFACE_ATTR_DHCPV6_PD_MIN_LEN].name, iface->name);
876 }
877
878 if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
879 iface->dhcpv6_na = blobmsg_get_bool(c);
880
881 if ((c = tb[IFACE_ATTR_DHCPV6_HOSTID_LEN])) {
882 uint32_t hostid_len = blobmsg_get_u32(c);
883
884 if (hostid_len >= HOSTID_LEN_MIN && hostid_len <= HOSTID_LEN_MAX)
885 iface->dhcpv6_hostid_len = hostid_len;
886 else
887 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
888 iface_attrs[IFACE_ATTR_DHCPV6_HOSTID_LEN].name, iface->name);
889
890 }
891
892 if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
893 iface->default_router = blobmsg_get_u32(c);
894
895 /* IFACE_ATTR_RA_MANAGEMENT aka ra_management is deprecated since 2019 */
896 if (!tb[IFACE_ATTR_RA_FLAGS] && !tb[IFACE_ATTR_RA_SLAAC] &&
897 (c = tb[IFACE_ATTR_RA_MANAGEMENT])) {
898 switch (blobmsg_get_u32(c)) {
899 case 0:
900 iface->ra_flags = ND_RA_FLAG_OTHER;
901 iface->ra_slaac = true;
902 break;
903 case 1:
904 iface->ra_flags = ND_RA_FLAG_OTHER|ND_RA_FLAG_MANAGED;
905 iface->ra_slaac = true;
906 break;
907 case 2:
908 iface->ra_flags = ND_RA_FLAG_OTHER|ND_RA_FLAG_MANAGED;
909 iface->ra_slaac = false;
910 break;
911 default:
912 break;
913 }
914 }
915
916 if ((c = tb[IFACE_ATTR_RA_FLAGS])) {
917 iface->ra_flags = 0;
918
919 if (parse_ra_flags(&iface->ra_flags, c) < 0)
920 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
921 iface_attrs[IFACE_ATTR_RA_FLAGS].name, iface->name);
922 }
923
924 if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
925 uint32_t ra_reachabletime = blobmsg_get_u32(c);
926
927 if (ra_reachabletime <= 3600000)
928 iface->ra_reachabletime = ra_reachabletime;
929 else
930 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
931 iface_attrs[IFACE_ATTR_RA_REACHABLETIME].name, iface->name);
932 }
933
934 if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
935 uint32_t ra_retranstime = blobmsg_get_u32(c);
936
937 if (ra_retranstime <= 60000)
938 iface->ra_retranstime = ra_retranstime;
939 else
940 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
941 iface_attrs[IFACE_ATTR_RA_RETRANSTIME].name, iface->name);
942 }
943
944 if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
945 uint32_t ra_hoplimit = blobmsg_get_u32(c);
946
947 if (ra_hoplimit <= 255)
948 iface->ra_hoplimit = ra_hoplimit;
949 else
950 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
951 iface_attrs[IFACE_ATTR_RA_HOPLIMIT].name, iface->name);
952 }
953
954 if ((c = tb[IFACE_ATTR_RA_MTU])) {
955 uint32_t ra_mtu = blobmsg_get_u32(c);
956
957 if (ra_mtu >= 1280 || ra_mtu <= 65535)
958 iface->ra_mtu = ra_mtu;
959 else
960 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
961 iface_attrs[IFACE_ATTR_RA_MTU].name, iface->name);
962 }
963
964 if ((c = tb[IFACE_ATTR_RA_SLAAC]))
965 iface->ra_slaac = blobmsg_get_bool(c);
966
967 if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
968 iface->ra_not_onlink = blobmsg_get_bool(c);
969
970 if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
971 iface->ra_advrouter = blobmsg_get_bool(c);
972
973 if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
974 iface->ra_mininterval = blobmsg_get_u32(c);
975
976 if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
977 iface->ra_maxinterval = blobmsg_get_u32(c);
978
979 if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
980 iface->ra_lifetime = blobmsg_get_u32(c);
981
982 if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
983 iface->ra_useleasetime = blobmsg_get_bool(c);
984
985 if ((c = tb[IFACE_ATTR_RA_DNS]))
986 iface->ra_dns = blobmsg_get_bool(c);
987
988 if ((c = tb[IFACE_ATTR_RA_PREF64])) {
989 const char *str = blobmsg_get_string(c);
990 char *astr = malloc(strlen(str) + 1);
991 char *delim;
992 int l;
993
994 if (!astr || !strcpy(astr, str) ||
995 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
996 sscanf(delim, "%i", &l) == 0 || l > 128 ||
997 inet_pton(AF_INET6, astr, &iface->pref64_addr) == 0)
998 iface->pref64_length = 0;
999 else
1000 iface->pref64_length = l;
1001
1002 if (astr)
1003 free(astr);
1004 }
1005
1006 if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
1007 const char *prio = blobmsg_get_string(c);
1008
1009 if (!strcmp(prio, "high"))
1010 iface->route_preference = 1;
1011 else if (!strcmp(prio, "low"))
1012 iface->route_preference = -1;
1013 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
1014 iface->route_preference = 0;
1015 else
1016 syslog(LOG_ERR, "Invalid %s mode configured for interface '%s'",
1017 iface_attrs[IFACE_ATTR_RA_PREFERENCE].name, iface->name);
1018 }
1019
1020 if ((c = tb[IFACE_ATTR_PD_MANAGER]))
1021 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
1022 sizeof(iface->dhcpv6_pd_manager) - 1);
1023
1024 if ((c = tb[IFACE_ATTR_PD_CER]) &&
1025 inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
1026 syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
1027 iface_attrs[IFACE_ATTR_PD_CER].name, iface->name);
1028
1029 if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
1030 iface->learn_routes = blobmsg_get_bool(c);
1031
1032 if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
1033 iface->external = blobmsg_get_bool(c);
1034
1035 if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
1036 const char *str = blobmsg_get_string(c);
1037 char *astr = malloc(strlen(str) + 1);
1038 char *delim;
1039 int l;
1040
1041 if (!astr || !strcpy(astr, str) ||
1042 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
1043 sscanf(delim, "%i", &l) == 0 || l > 128 ||
1044 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
1045 iface->pio_filter_length = 0;
1046 else
1047 iface->pio_filter_length = l;
1048
1049 if (astr)
1050 free(astr);
1051 }
1052
1053 if (overwrite && (c = tb[IFACE_ATTR_NTP])) {
1054 struct blob_attr *cur;
1055 unsigned rem;
1056
1057 blobmsg_for_each_attr(cur, c, rem) {
1058 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
1059 continue;
1060
1061 char *str = blobmsg_get_string(cur);
1062 struct in_addr addr4;
1063 struct in6_addr addr6;
1064
1065 if (inet_pton(AF_INET, str, &addr4) == 1) {
1066 if (addr4.s_addr == INADDR_ANY)
1067 goto err;
1068
1069 iface->dhcpv4_ntp = realloc(iface->dhcpv4_ntp,
1070 (++iface->dhcpv4_ntp_cnt) * sizeof(*iface->dhcpv4_ntp));
1071 if (!iface->dhcpv4_ntp)
1072 goto err;
1073
1074 iface->dhcpv4_ntp[iface->dhcpv4_ntp_cnt - 1] = addr4;
1075 } else if (inet_pton(AF_INET6, str, &addr6) == 1) {
1076 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
1077 goto err;
1078
1079 iface->dhcpv6_sntp = realloc(iface->dhcpv6_sntp,
1080 (++iface->dhcpv6_sntp_cnt) * sizeof(*iface->dhcpv6_sntp));
1081 if (!iface->dhcpv6_sntp)
1082 goto err;
1083
1084 iface->dhcpv6_sntp[iface->dhcpv6_sntp_cnt - 1] = addr6;
1085
1086 if (!parse_ntp_options(&iface->dhcpv6_ntp_len, addr6, &iface->dhcpv6_ntp))
1087 iface->dhcpv6_ntp_cnt++;
1088 } else {
1089 if (!parse_ntp_fqdn(&iface->dhcpv6_ntp_len, str, &iface->dhcpv6_ntp))
1090 iface->dhcpv6_ntp_cnt++;
1091 }
1092 }
1093 }
1094
1095 return 0;
1096
1097 err:
1098 close_interface(iface);
1099 return -1;
1100 }
1101
1102 static int set_interface(struct uci_section *s)
1103 {
1104 blob_buf_init(&b, 0);
1105 uci_to_blob(&b, s, &interface_attr_list);
1106
1107 return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
1108 }
1109
1110 static void lease_delete_assignments(struct lease *l, bool v6)
1111 {
1112 struct dhcp_assignment *a, *tmp;
1113 unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
1114
1115 list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
1116 if (a->flags & flag)
1117 free_assignment(a);
1118 }
1119 }
1120
1121 static void lease_update_assignments(struct lease *l)
1122 {
1123 struct dhcp_assignment *a;
1124
1125 list_for_each_entry(a, &l->assignments, lease_list) {
1126 if (a->hostname)
1127 free(a->hostname);
1128 a->hostname = NULL;
1129
1130 if (l->hostname)
1131 a->hostname = strdup(l->hostname);
1132
1133 a->leasetime = l->leasetime;
1134 }
1135 }
1136
1137 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
1138 {
1139 const struct lease *l1 = k1, *l2 = k2;
1140 int cmp = 0;
1141
1142 if (l1->duid_len != l2->duid_len)
1143 return l1->duid_len - l2->duid_len;
1144
1145 if (l1->duid_len && l2->duid_len)
1146 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
1147
1148 if (cmp)
1149 return cmp;
1150
1151 return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
1152 sizeof(l1->mac.ether_addr_octet));
1153 }
1154
1155 static void lease_change_config(struct lease *l_old, struct lease *l_new)
1156 {
1157 bool update = false;
1158
1159 if ((!!l_new->hostname != !!l_old->hostname) ||
1160 (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
1161 free(l_old->hostname);
1162 l_old->hostname = NULL;
1163
1164 if (l_new->hostname)
1165 l_old->hostname = strdup(l_new->hostname);
1166
1167 update = true;
1168 }
1169
1170 if (l_old->leasetime != l_new->leasetime) {
1171 l_old->leasetime = l_new->leasetime;
1172 update = true;
1173 }
1174
1175 if (l_old->ipaddr != l_new->ipaddr) {
1176 l_old->ipaddr = l_new->ipaddr;
1177 lease_delete_assignments(l_old, false);
1178 }
1179
1180 if (l_old->hostid != l_new->hostid) {
1181 l_old->hostid = l_new->hostid;
1182 lease_delete_assignments(l_old, true);
1183 }
1184
1185 if (update)
1186 lease_update_assignments(l_old);
1187
1188 free_lease(l_new);
1189 }
1190
1191 static void lease_delete(struct lease *l)
1192 {
1193 struct dhcp_assignment *a, *tmp;
1194
1195 list_for_each_entry_safe(a, tmp, &l->assignments, lease_list)
1196 free_assignment(a);
1197
1198 free_lease(l);
1199 }
1200
1201 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
1202 struct vlist_node *node_old)
1203 {
1204 struct lease *lease_new = container_of(node_new, struct lease, node);
1205 struct lease *lease_old = container_of(node_old, struct lease, node);
1206
1207 if (node_old && node_new)
1208 lease_change_config(lease_old, lease_new);
1209 else if (node_old)
1210 lease_delete(lease_old);
1211 }
1212
1213 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
1214 {
1215 struct lease *l;
1216
1217 vlist_for_each_element(&leases, l, node) {
1218 if (l->duid_len == len && !memcmp(l->duid, duid, len))
1219 return l;
1220 }
1221
1222 return NULL;
1223 }
1224
1225 struct lease *config_find_lease_by_mac(const uint8_t *mac)
1226 {
1227 struct lease *l;
1228
1229 vlist_for_each_element(&leases, l, node) {
1230 if (!memcmp(l->mac.ether_addr_octet, mac,
1231 sizeof(l->mac.ether_addr_octet)))
1232 return l;
1233 }
1234
1235 return NULL;
1236 }
1237
1238 struct lease *config_find_lease_by_hostid(const uint64_t hostid)
1239 {
1240 struct lease *l;
1241
1242 vlist_for_each_element(&leases, l, node) {
1243 if (l->hostid == hostid)
1244 return l;
1245 }
1246
1247 return NULL;
1248 }
1249
1250 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
1251 {
1252 struct lease *l;
1253
1254 vlist_for_each_element(&leases, l, node) {
1255 if (l->ipaddr == ipaddr)
1256 return l;
1257 }
1258
1259 return NULL;
1260 }
1261
1262 void reload_services(struct interface *iface)
1263 {
1264 if (iface->ifflags & IFF_RUNNING) {
1265 syslog(LOG_DEBUG, "Enabling services with %s running", iface->ifname);
1266 router_setup_interface(iface, iface->ra != MODE_DISABLED);
1267 dhcpv6_setup_interface(iface, iface->dhcpv6 != MODE_DISABLED);
1268 ndp_setup_interface(iface, iface->ndp != MODE_DISABLED);
1269 #ifdef DHCPV4_SUPPORT
1270 dhcpv4_setup_interface(iface, iface->dhcpv4 != MODE_DISABLED);
1271 #endif
1272 } else {
1273 syslog(LOG_DEBUG, "Disabling services with %s not running", iface->ifname);
1274 router_setup_interface(iface, false);
1275 dhcpv6_setup_interface(iface, false);
1276 ndp_setup_interface(iface, false);
1277 #ifdef DHCPV4_SUPPORT
1278 dhcpv4_setup_interface(iface, false);
1279 #endif
1280 }
1281 }
1282
1283 void odhcpd_reload(void)
1284 {
1285 struct uci_context *uci = uci_alloc_context();
1286 struct interface *master = NULL, *i, *tmp;
1287
1288 if (!uci)
1289 return;
1290
1291 vlist_update(&leases);
1292 avl_for_each_element(&interfaces, i, avl)
1293 clean_interface(i);
1294
1295 struct uci_package *dhcp = NULL;
1296 if (!uci_load(uci, "dhcp", &dhcp)) {
1297 struct uci_element *e;
1298
1299 /* 1. Global settings */
1300 uci_foreach_element(&dhcp->sections, e) {
1301 struct uci_section *s = uci_to_section(e);
1302 if (!strcmp(s->type, "odhcpd"))
1303 set_config(s);
1304 }
1305
1306 /* 2. DHCP pools */
1307 uci_foreach_element(&dhcp->sections, e) {
1308 struct uci_section *s = uci_to_section(e);
1309 if (!strcmp(s->type, "dhcp"))
1310 set_interface(s);
1311 }
1312
1313 /* 3. Static leases */
1314 uci_foreach_element(&dhcp->sections, e) {
1315 struct uci_section* s = uci_to_section(e);
1316 if (!strcmp(s->type, "host"))
1317 set_lease_from_uci(s);
1318 }
1319 }
1320
1321 if (config.dhcp_statefile) {
1322 char *path = strdup(config.dhcp_statefile);
1323
1324 mkdir_p(dirname(path), 0755);
1325 free(path);
1326 }
1327
1328 vlist_flush(&leases);
1329
1330 #ifdef WITH_UBUS
1331 ubus_apply_network();
1332 #endif
1333
1334 bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
1335
1336 /* Test for */
1337 avl_for_each_element(&interfaces, i, avl) {
1338 if (i->master)
1339 continue;
1340
1341 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
1342 any_dhcpv6_slave = true;
1343
1344 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
1345 any_ra_slave = true;
1346
1347 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
1348 any_ndp_slave = true;
1349 }
1350
1351 /* Evaluate hybrid mode for master */
1352 avl_for_each_element(&interfaces, i, avl) {
1353 if (!i->master)
1354 continue;
1355
1356 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1357 #ifdef WITH_UBUS
1358 if (!ubus_has_prefix(i->name, i->ifname))
1359 hybrid_mode = MODE_RELAY;
1360 #endif
1361
1362 if (i->dhcpv6 == MODE_HYBRID)
1363 i->dhcpv6 = hybrid_mode;
1364
1365 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1366 i->dhcpv6 = MODE_DISABLED;
1367
1368 if (i->ra == MODE_HYBRID)
1369 i->ra = hybrid_mode;
1370
1371 if (i->ra == MODE_RELAY && !any_ra_slave)
1372 i->ra = MODE_DISABLED;
1373
1374 if (i->ndp == MODE_HYBRID)
1375 i->ndp = hybrid_mode;
1376
1377 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1378 i->ndp = MODE_DISABLED;
1379
1380 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1381 master = i;
1382 }
1383
1384
1385 avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1386 if (i->inuse && i->ifflags & IFF_RUNNING) {
1387 /* Resolve hybrid mode */
1388 if (i->dhcpv6 == MODE_HYBRID)
1389 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1390 MODE_RELAY : MODE_SERVER;
1391
1392 if (i->ra == MODE_HYBRID)
1393 i->ra = (master && master->ra == MODE_RELAY) ?
1394 MODE_RELAY : MODE_SERVER;
1395
1396 if (i->ndp == MODE_HYBRID)
1397 i->ndp = (master && master->ndp == MODE_RELAY) ?
1398 MODE_RELAY : MODE_DISABLED;
1399
1400 reload_services(i);
1401 } else
1402 close_interface(i);
1403 }
1404
1405 uci_unload(uci, dhcp);
1406 uci_free_context(uci);
1407 }
1408
1409 static void handle_signal(int signal)
1410 {
1411 char b[1] = {0};
1412
1413 if (signal == SIGHUP) {
1414 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1415 } else
1416 uloop_end();
1417 }
1418
1419 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1420 {
1421 char b[512];
1422 if (read(u->fd, b, sizeof(b)) < 0) {}
1423
1424 odhcpd_reload();
1425 }
1426
1427 static struct uloop_fd reload_fd = { .fd = -1, .cb = reload_cb };
1428
1429 void odhcpd_run(void)
1430 {
1431 if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1432
1433 reload_fd.fd = reload_pipe[0];
1434 uloop_fd_add(&reload_fd, ULOOP_READ);
1435
1436 signal(SIGTERM, handle_signal);
1437 signal(SIGINT, handle_signal);
1438 signal(SIGHUP, handle_signal);
1439
1440 #ifdef WITH_UBUS
1441 while (ubus_init())
1442 sleep(1);
1443 #endif
1444
1445 odhcpd_reload();
1446 uloop_run();
1447 }
OpenWrt DHCP Server