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,
  33                         .log_level = LOG_WARNING};
  34
  35 #define START_DEFAULT   100
  36 #define LIMIT_DEFAULT   150
  37
  38 enum {
  39         IFACE_ATTR_INTERFACE,
  40         IFACE_ATTR_IFNAME,
  41         IFACE_ATTR_NETWORKID,
  42         IFACE_ATTR_DYNAMICDHCP,
  43         IFACE_ATTR_LEASETIME,
  44         IFACE_ATTR_LIMIT,
  45         IFACE_ATTR_START,
  46         IFACE_ATTR_MASTER,
  47         IFACE_ATTR_UPSTREAM,
  48         IFACE_ATTR_RA,
  49         IFACE_ATTR_DHCPV4,
  50         IFACE_ATTR_DHCPV6,
  51         IFACE_ATTR_NDP,
  52         IFACE_ATTR_ROUTER,
  53         IFACE_ATTR_DNS,
  54         IFACE_ATTR_DOMAIN,
  55         IFACE_ATTR_FILTER_CLASS,
  56         IFACE_ATTR_DHCPV4_FORCERECONF,
  57         IFACE_ATTR_DHCPV6_RAW,
  58         IFACE_ATTR_DHCPV6_ASSIGNALL,
  59         IFACE_ATTR_DHCPV6_PD,
  60         IFACE_ATTR_DHCPV6_NA,
  61         IFACE_ATTR_RA_DEFAULT,
  62         IFACE_ATTR_RA_MANAGEMENT,
  63         IFACE_ATTR_RA_FLAGS,
  64         IFACE_ATTR_RA_SLAAC,
  65         IFACE_ATTR_RA_OFFLINK,
  66         IFACE_ATTR_RA_PREFERENCE,
  67         IFACE_ATTR_RA_ADVROUTER,
  68         IFACE_ATTR_RA_MININTERVAL,
  69         IFACE_ATTR_RA_MAXINTERVAL,
  70         IFACE_ATTR_RA_LIFETIME,
  71         IFACE_ATTR_RA_USELEASETIME,
  72         IFACE_ATTR_RA_REACHABLETIME,
  73         IFACE_ATTR_RA_RETRANSTIME,
  74         IFACE_ATTR_RA_HOPLIMIT,
  75         IFACE_ATTR_RA_MTU,
  76         IFACE_ATTR_RA_DNS,
  77         IFACE_ATTR_PD_MANAGER,
  78         IFACE_ATTR_PD_CER,
  79         IFACE_ATTR_NDPROXY_ROUTING,
  80         IFACE_ATTR_NDPROXY_SLAVE,
  81         IFACE_ATTR_PREFIX_FILTER,
  82         IFACE_ATTR_MAX
  83 };
  84
  85 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  86         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  90         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  91         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  93         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  94         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  95         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  96         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  97         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  98         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  99         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
 100         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 101         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
 102         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
 103         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
 104         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
 105         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
 106         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
 107         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
 108         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
 109         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
 110         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
 111         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
 112         [IFACE_ATTR_RA_FLAGS] = { .name = "ra_flags", . type = BLOBMSG_TYPE_ARRAY },
 113         [IFACE_ATTR_RA_SLAAC] = { .name = "ra_slaac", .type = BLOBMSG_TYPE_BOOL },
 114         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 115         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 116         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 117         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 118         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 119         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 120         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 121         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 122         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 123         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 124         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 125         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 126         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 127         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 128         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 129 };
 130
 131 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 132         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 133         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 134         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 135 };
 136
 137 const struct uci_blob_param_list interface_attr_list = {
 138         .n_params = IFACE_ATTR_MAX,
 139         .params = iface_attrs,
 140         .info = iface_attr_info,
 141 };
 142
 143 enum {
 144         LEASE_ATTR_IP,
 145         LEASE_ATTR_MAC,
 146         LEASE_ATTR_DUID,
 147         LEASE_ATTR_HOSTID,
 148         LEASE_ATTR_LEASETIME,
 149         LEASE_ATTR_NAME,
 150         LEASE_ATTR_MAX
 151 };
 152
 153 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 154         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 155         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 156         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 157         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 158         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 159         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 160 };
 161
 162 const struct uci_blob_param_list lease_attr_list = {
 163         .n_params = LEASE_ATTR_MAX,
 164         .params = lease_attrs,
 165 };
 166
 167 enum {
 168         ODHCPD_ATTR_LEGACY,
 169         ODHCPD_ATTR_MAINDHCP,
 170         ODHCPD_ATTR_LEASEFILE,
 171         ODHCPD_ATTR_LEASETRIGGER,
 172         ODHCPD_ATTR_LOGLEVEL,
 173         ODHCPD_ATTR_MAX
 174 };
 175
 176 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 177         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 178         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 179         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 180         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 181         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 182 };
 183
 184 const struct uci_blob_param_list odhcpd_attr_list = {
 185         .n_params = ODHCPD_ATTR_MAX,
 186         .params = odhcpd_attrs,
 187 };
 188
 189 static const struct { const char *name; uint8_t flag; } ra_flags[] = {
 190         { .name = "managed-config", .flag = ND_RA_FLAG_MANAGED },
 191         { .name = "other-config", .flag = ND_RA_FLAG_OTHER },
 192         { .name = "home-agent", .flag = ND_RA_FLAG_HOME_AGENT },
 193         { .name = "none", . flag = 0 },
 194         { .name = NULL, },
 195 };
 196
 197 static int mkdir_p(char *dir, mode_t mask)
 198 {
 199         char *l = strrchr(dir, '/');
 200         int ret;
 201
 202         if (!l)
 203                 return 0;
 204
 205         *l = '\0';
 206
 207         if (mkdir_p(dir, mask))
 208                 return -1;
 209
 210         *l = '/';
 211
 212         ret = mkdir(dir, mask);
 213         if (ret && errno == EEXIST)
 214                 return 0;
 215
 216         if (ret)
 217                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 218
 219         return ret;
 220 }
 221
 222 static void set_interface_defaults(struct interface *iface)
 223 {
 224         iface->ignore = true;
 225         iface->dhcpv4 = MODE_DISABLED;
 226         iface->dhcpv6 = MODE_DISABLED;
 227         iface->ra = MODE_DISABLED;
 228         iface->ndp = MODE_DISABLED;
 229         iface->learn_routes = 1;
 230         iface->dhcpv4_leasetime = 43200;
 231         iface->dhcpv4_start.s_addr = htonl(START_DEFAULT);
 232         iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
 233         iface->dhcpv6_assignall = true;
 234         iface->dhcpv6_pd = true;
 235         iface->dhcpv6_na = true;
 236         iface->ra_flags = ND_RA_FLAG_OTHER;
 237         iface->ra_slaac = true;
 238         iface->ra_maxinterval = 600;
 239         iface->ra_mininterval = iface->ra_maxinterval/3;
 240         iface->ra_lifetime = -1;
 241         iface->ra_dns = true;
 242 }
 243
 244 static void clean_interface(struct interface *iface)
 245 {
 246         free(iface->dns);
 247         free(iface->search);
 248         free(iface->upstream);
 249         free(iface->dhcpv4_router);
 250         free(iface->dhcpv4_dns);
 251         free(iface->dhcpv6_raw);
 252         free(iface->filter_class);
 253         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 254         set_interface_defaults(iface);
 255 }
 256
 257 static void close_interface(struct interface *iface)
 258 {
 259         avl_delete(&interfaces, &iface->avl);
 260
 261         router_setup_interface(iface, false);
 262         dhcpv6_setup_interface(iface, false);
 263         ndp_setup_interface(iface, false);
 264 #ifdef DHCPV4_SUPPORT
 265         dhcpv4_setup_interface(iface, false);
 266 #endif
 267
 268         clean_interface(iface);
 269         free(iface->addr4);
 270         free(iface->addr6);
 271         free(iface->ifname);
 272         free(iface);
 273 }
 274
 275 static int parse_mode(const char *mode)
 276 {
 277         if (!strcmp(mode, "disabled"))
 278                 return MODE_DISABLED;
 279         else if (!strcmp(mode, "server"))
 280                 return MODE_SERVER;
 281         else if (!strcmp(mode, "relay"))
 282                 return MODE_RELAY;
 283         else if (!strcmp(mode, "hybrid"))
 284                 return MODE_HYBRID;
 285         else
 286                 return -1;
 287 }
 288
 289 static int parse_ra_flags(uint8_t *flags, struct blob_attr *attr)
 290 {
 291         struct blob_attr *cur;
 292         unsigned rem;
 293
 294         blobmsg_for_each_attr(cur, attr, rem) {
 295                 int i;
 296
 297                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 298                         continue;
 299
 300                 if (!blobmsg_check_attr(cur, false))
 301                         continue;
 302
 303                 for (i = 0; ra_flags[i].name; i++) {
 304                         if (!strcmp(ra_flags[i].name, blobmsg_get_string(cur))) {
 305                                 *flags |= ra_flags[i].flag;
 306                                 break;
 307                         }
 308                 }
 309
 310                 if (!ra_flags[i].name)
 311                         return -1;
 312         }
 313
 314         return 0;
 315 }
 316
 317 static void set_config(struct uci_section *s)
 318 {
 319         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 320
 321         blob_buf_init(&b, 0);
 322         uci_to_blob(&b, s, &odhcpd_attr_list);
 323         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 324
 325         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 326                 config.legacy = blobmsg_get_bool(c);
 327
 328         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 329                 config.main_dhcpv4 = blobmsg_get_bool(c);
 330
 331         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 332                 free(config.dhcp_statefile);
 333                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 334         }
 335
 336         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 337                 free(config.dhcp_cb);
 338                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 339         }
 340
 341         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 342                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 343
 344                 if (config.log_level != log_level) {
 345                         config.log_level = log_level;
 346                         setlogmask(LOG_UPTO(config.log_level));
 347                 }
 348         }
 349 }
 350
 351 static double parse_leasetime(struct blob_attr *c) {
 352         char *val = blobmsg_get_string(c), *endptr = NULL;
 353         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 354
 355         if (time && endptr && endptr[0]) {
 356                 if (endptr[0] == 's')
 357                         time *= 1;
 358                 else if (endptr[0] == 'm')
 359                         time *= 60;
 360                 else if (endptr[0] == 'h')
 361                         time *= 3600;
 362                 else if (endptr[0] == 'd')
 363                         time *= 24 * 3600;
 364                 else if (endptr[0] == 'w')
 365                         time *= 7 * 24 * 3600;
 366                 else
 367                         goto err;
 368         }
 369
 370         if (time < 60)
 371                 time = 60;
 372
 373         return time;
 374
 375 err:
 376         return -1;
 377 }
 378
 379 static void free_lease(struct lease *l)
 380 {
 381         free(l->hostname);
 382         free(l);
 383 }
 384
 385 static int set_lease(struct uci_section *s)
 386 {
 387         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 388         struct lease *l;
 389         size_t duidlen = 0;
 390         uint8_t *duid;
 391
 392         blob_buf_init(&b, 0);
 393         uci_to_blob(&b, s, &lease_attr_list);
 394         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 395
 396         if ((c = tb[LEASE_ATTR_DUID]))
 397                 duidlen = (blobmsg_data_len(c) - 1) / 2;
 398
 399         l = calloc_a(sizeof(*l), &duid, duidlen);
 400         if (!l)
 401                 goto err;
 402
 403         if ((c = tb[LEASE_ATTR_MAC]))
 404                 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
 405                         goto err;
 406
 407         if ((c = tb[LEASE_ATTR_DUID])) {
 408                 ssize_t len;
 409
 410                 l->duid = duid;
 411                 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
 412
 413                 if (len < 0)
 414                         goto err;
 415
 416                 l->duid_len = len;
 417         }
 418
 419         if ((c = tb[LEASE_ATTR_NAME])) {
 420                 l->hostname = strdup(blobmsg_get_string(c));
 421                 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
 422                         goto err;
 423         }
 424
 425         if ((c = tb[LEASE_ATTR_IP]))
 426                 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
 427                         goto err;
 428
 429         if ((c = tb[LEASE_ATTR_HOSTID])) {
 430                 errno = 0;
 431                 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 432                 if (errno)
 433                         goto err;
 434         } else {
 435                 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
 436                 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
 437         }
 438
 439         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 440                 double time = parse_leasetime(c);
 441                 if (time < 0)
 442                         goto err;
 443
 444                 l->leasetime = time;
 445         }
 446
 447         INIT_LIST_HEAD(&l->assignments);
 448         vlist_add(&leases, &l->node, l);
 449         return 0;
 450
 451 err:
 452         if (l)
 453                 free_lease(l);
 454
 455         return -1;
 456 }
 457
 458 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 459 {
 460         struct interface *iface;
 461         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 462         bool get_addrs = false;
 463
 464         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 465
 466         if (tb[IFACE_ATTR_INTERFACE])
 467                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 468
 469         if (!name)
 470                 return -1;
 471
 472         iface = avl_find_element(&interfaces, name, iface, avl);
 473         if (!iface) {
 474                 char *new_name;
 475
 476                 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
 477                 if (!iface)
 478                         return -1;
 479
 480                 iface->name = strcpy(new_name, name);
 481                 iface->avl.key = iface->name;
 482                 iface->router_event.uloop.fd = -1;
 483                 iface->dhcpv6_event.uloop.fd = -1;
 484                 iface->ndp_event.uloop.fd = -1;
 485                 iface->ndp_ping_fd = -1;
 486                 iface->dhcpv4_event.uloop.fd = -1;
 487                 INIT_LIST_HEAD(&iface->ia_assignments);
 488                 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
 489                 INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
 490
 491                 set_interface_defaults(iface);
 492
 493                 avl_insert(&interfaces, &iface->avl);
 494                 get_addrs = overwrite = true;
 495         }
 496
 497         const char *ifname = NULL;
 498         if (overwrite) {
 499                 if ((c = tb[IFACE_ATTR_IFNAME]))
 500                         ifname = blobmsg_get_string(c);
 501                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 502                         ifname = blobmsg_get_string(c);
 503         }
 504
 505 #ifdef WITH_UBUS
 506         if (overwrite || !iface->ifname)
 507                 ifname = ubus_get_ifname(name);
 508 #endif
 509
 510         if (!iface->ifname && !ifname)
 511                 goto err;
 512
 513         if (ifname) {
 514                 free(iface->ifname);
 515                 iface->ifname = strdup(ifname);
 516
 517                 if (!iface->ifname)
 518                         goto err;
 519
 520                 if (!iface->ifindex &&
 521                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 522                         goto err;
 523         }
 524
 525         if (get_addrs) {
 526                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 527                                                 true, &iface->addr6);
 528
 529                 if (len > 0)
 530                         iface->addr6_len = len;
 531
 532                 len = netlink_get_interface_addrs(iface->ifindex,
 533                                                 false, &iface->addr4);
 534                 if (len > 0)
 535                         iface->addr4_len = len;
 536         }
 537
 538         iface->inuse = true;
 539
 540         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 541                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 542
 543         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 544                 double time = parse_leasetime(c);
 545                 if (time < 0)
 546                         goto err;
 547
 548                 iface->dhcpv4_leasetime = time;
 549         }
 550
 551         if ((c = tb[IFACE_ATTR_START])) {
 552                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 553                 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
 554                                                         LIMIT_DEFAULT - 1);
 555
 556                 if (config.main_dhcpv4 && config.legacy)
 557                         iface->dhcpv4 = MODE_SERVER;
 558         }
 559
 560         if ((c = tb[IFACE_ATTR_LIMIT]))
 561                 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
 562                                                         blobmsg_get_u32(c) - 1);
 563
 564         if ((c = tb[IFACE_ATTR_MASTER]))
 565                 iface->master = blobmsg_get_bool(c);
 566
 567         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 568                 struct blob_attr *cur;
 569                 unsigned rem;
 570
 571                 blobmsg_for_each_attr(cur, c, rem) {
 572                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 573                                 continue;
 574
 575                         iface->upstream = realloc(iface->upstream,
 576                                         iface->upstream_len + blobmsg_data_len(cur));
 577                         if (!iface->upstream)
 578                                 goto err;
 579
 580                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 581                         iface->upstream_len += blobmsg_data_len(cur);
 582                 }
 583         }
 584
 585         int mode;
 586         if ((c = tb[IFACE_ATTR_RA])) {
 587                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 588                         iface->ra = mode;
 589
 590                         if (iface->ra != MODE_DISABLED)
 591                                 iface->ignore = false;
 592                 } else
 593                         goto err;
 594         }
 595
 596         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 597                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 598                         if (config.main_dhcpv4) {
 599                                 iface->dhcpv4 = mode;
 600
 601                                 if (iface->dhcpv4 != MODE_DISABLED)
 602                                         iface->ignore = false;
 603                         }
 604                 }
 605                 else
 606                         goto err;
 607         }
 608
 609         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 610                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 611                         iface->dhcpv6 = mode;
 612
 613                         if (iface->dhcpv6 != MODE_DISABLED)
 614                                 iface->ignore = false;
 615                 } else
 616                         goto err;
 617         }
 618
 619         if ((c = tb[IFACE_ATTR_NDP])) {
 620                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 621                         iface->ndp = mode;
 622
 623                         if (iface->ndp != MODE_DISABLED)
 624                                 iface->ignore = false;
 625                 } else
 626                         goto err;
 627         }
 628
 629         if ((c = tb[IFACE_ATTR_ROUTER])) {
 630                 struct blob_attr *cur;
 631                 unsigned rem;
 632
 633                 blobmsg_for_each_attr(cur, c, rem) {
 634                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 635                                 continue;
 636
 637                         struct in_addr addr4;
 638                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 639                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 640                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 641                                 if (!iface->dhcpv4_router)
 642                                         goto err;
 643
 644                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 645                         } else
 646                                 goto err;
 647                 }
 648         }
 649
 650         if ((c = tb[IFACE_ATTR_DNS])) {
 651                 struct blob_attr *cur;
 652                 unsigned rem;
 653
 654                 iface->always_rewrite_dns = true;
 655                 blobmsg_for_each_attr(cur, c, rem) {
 656                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 657                                 continue;
 658
 659                         struct in_addr addr4;
 660                         struct in6_addr addr6;
 661                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 662                                 if (addr4.s_addr == INADDR_ANY)
 663                                         goto err;
 664
 665                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 666                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 667                                 if (!iface->dhcpv4_dns)
 668                                         goto err;
 669
 670                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 671                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 672                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 673                                         goto err;
 674
 675                                 iface->dns = realloc(iface->dns,
 676                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 677                                 if (!iface->dns)
 678                                         goto err;
 679
 680                                 iface->dns[iface->dns_cnt - 1] = addr6;
 681                         } else
 682                                 goto err;
 683                 }
 684         }
 685
 686         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 687                 struct blob_attr *cur;
 688                 unsigned rem;
 689
 690                 blobmsg_for_each_attr(cur, c, rem) {
 691                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 692                                 continue;
 693
 694                         uint8_t buf[256];
 695                         char *domain = blobmsg_get_string(cur);
 696                         size_t domainlen = strlen(domain);
 697                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 698                                 domain[domainlen - 1] = 0;
 699
 700                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 701                         if (len <= 0)
 702                                 goto err;
 703
 704                         iface->search = realloc(iface->search, iface->search_len + len);
 705                         if (!iface->search)
 706                                 goto err;
 707
 708                         memcpy(&iface->search[iface->search_len], buf, len);
 709                         iface->search_len += len;
 710                 }
 711         }
 712
 713         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 714                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 715                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 716         }
 717
 718         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 719                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 720
 721         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 722                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 723                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 724                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 725         }
 726
 727         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 728                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 729
 730         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 731                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 732
 733         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 734                 iface->dhcpv6_na = blobmsg_get_bool(c);
 735
 736         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 737                 iface->default_router = blobmsg_get_u32(c);
 738
 739         if (!tb[IFACE_ATTR_RA_FLAGS] && !tb[IFACE_ATTR_RA_SLAAC] &&
 740             (c = tb[IFACE_ATTR_RA_MANAGEMENT])) {
 741                 switch (blobmsg_get_u32(c)) {
 742                 case 0:
 743                         iface->ra_flags = ND_RA_FLAG_OTHER;
 744                         iface->ra_slaac = true;
 745                         break;
 746                 case 1:
 747                         iface->ra_flags = ND_RA_FLAG_OTHER|ND_RA_FLAG_MANAGED;
 748                         iface->ra_slaac = true;
 749                         break;
 750                 case 2:
 751                         iface->ra_flags = ND_RA_FLAG_OTHER|ND_RA_FLAG_MANAGED;
 752                         iface->ra_slaac = false;
 753                         break;
 754                 default:
 755                         break;
 756                 }
 757         }
 758
 759         if ((c = tb[IFACE_ATTR_RA_FLAGS])) {
 760                 iface->ra_flags = 0;
 761                 if (parse_ra_flags(&iface->ra_flags, c) < 0)
 762                         goto err;
 763         }
 764
 765         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 766                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 767                 if (ra_reachabletime > 3600000)
 768                         goto err;
 769
 770                 iface->ra_reachabletime = ra_reachabletime;
 771         }
 772
 773         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 774                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 775                 if (ra_retranstime > 60000)
 776                         goto err;
 777
 778                 iface->ra_retranstime = ra_retranstime;
 779         }
 780
 781         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 782                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 783                 if (ra_hoplimit > 255)
 784                         goto err;
 785
 786                 iface->ra_hoplimit = ra_hoplimit;
 787         }
 788
 789         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 790                 uint32_t ra_mtu = blobmsg_get_u32(c);
 791                 if (ra_mtu < 1280 || ra_mtu > 65535)
 792                         goto err;
 793
 794                 iface->ra_mtu = ra_mtu;
 795         }
 796
 797         if ((c = tb[IFACE_ATTR_RA_SLAAC]))
 798                 iface->ra_slaac = blobmsg_get_bool(c);
 799
 800         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 801                 iface->ra_not_onlink = blobmsg_get_bool(c);
 802
 803         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 804                 iface->ra_advrouter = blobmsg_get_bool(c);
 805
 806         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 807                 iface->ra_mininterval =  blobmsg_get_u32(c);
 808
 809         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 810                 iface->ra_maxinterval = blobmsg_get_u32(c);
 811
 812         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 813                 iface->ra_lifetime = blobmsg_get_u32(c);
 814
 815         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 816                 iface->ra_useleasetime = blobmsg_get_bool(c);
 817
 818         if ((c = tb[IFACE_ATTR_RA_DNS]))
 819                 iface->ra_dns = blobmsg_get_bool(c);
 820
 821         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 822                 const char *prio = blobmsg_get_string(c);
 823
 824                 if (!strcmp(prio, "high"))
 825                         iface->route_preference = 1;
 826                 else if (!strcmp(prio, "low"))
 827                         iface->route_preference = -1;
 828                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 829                         iface->route_preference = 0;
 830                 else
 831                         goto err;
 832         }
 833
 834         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 835                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 836                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 837
 838         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 839                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 840                 goto err;
 841
 842         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 843                 iface->learn_routes = blobmsg_get_bool(c);
 844
 845         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 846                 iface->external = blobmsg_get_bool(c);
 847
 848         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 849                 const char *str = blobmsg_get_string(c);
 850                 char *astr = malloc(strlen(str) + 1);
 851                 char *delim;
 852                 int l;
 853
 854                 if (!astr || !strcpy(astr, str) ||
 855                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 856                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 857                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 858                         iface->pio_filter_length = 0;
 859                 else
 860                         iface->pio_filter_length = l;
 861
 862                 if (astr)
 863                         free(astr);
 864         }
 865
 866         return 0;
 867
 868 err:
 869         close_interface(iface);
 870         return -1;
 871 }
 872
 873 static int set_interface(struct uci_section *s)
 874 {
 875         blob_buf_init(&b, 0);
 876         uci_to_blob(&b, s, &interface_attr_list);
 877
 878         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 879 }
 880
 881 static void lease_delete_assignments(struct lease *l, bool v6)
 882 {
 883         struct dhcp_assignment *a, *tmp;
 884         unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
 885
 886         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
 887                 if (a->flags & flag)
 888                         free_assignment(a);
 889         }
 890 }
 891
 892 static void lease_update_assignments(struct lease *l)
 893 {
 894         struct dhcp_assignment *a;
 895
 896         list_for_each_entry(a, &l->assignments, lease_list) {
 897                 if (a->hostname)
 898                         free(a->hostname);
 899                 a->hostname = NULL;
 900
 901                 if (l->hostname)
 902                         a->hostname = strdup(l->hostname);
 903
 904                 a->leasetime = l->leasetime;
 905         }
 906 }
 907
 908 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
 909 {
 910         const struct lease *l1 = k1, *l2 = k2;
 911         int cmp = 0;
 912
 913         if (l1->duid_len != l2->duid_len)
 914                 return l1->duid_len - l2->duid_len;
 915
 916         if (l1->duid_len && l2->duid_len)
 917                 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
 918
 919         if (cmp)
 920                 return cmp;
 921
 922         return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
 923                       sizeof(l1->mac.ether_addr_octet));
 924 }
 925
 926 static void lease_change_config(struct lease *l_old, struct lease *l_new)
 927 {
 928         bool update = false;
 929
 930         if ((!!l_new->hostname != !!l_old->hostname) ||
 931             (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
 932                 free(l_old->hostname);
 933                 l_old->hostname = NULL;
 934
 935                 if (l_new->hostname)
 936                         l_old->hostname = strdup(l_new->hostname);
 937
 938                 update = true;
 939         }
 940
 941         if (l_old->leasetime != l_new->leasetime) {
 942                 l_old->leasetime = l_new->leasetime;
 943                 update = true;
 944         }
 945
 946         if (l_old->ipaddr != l_new->ipaddr) {
 947                 l_old->ipaddr = l_new->ipaddr;
 948                 lease_delete_assignments(l_old, false);
 949         }
 950
 951         if (l_old->hostid != l_new->hostid) {
 952                 l_old->hostid = l_new->hostid;
 953                 lease_delete_assignments(l_old, true);
 954         }
 955
 956         if (update)
 957                 lease_update_assignments(l_old);
 958
 959         free_lease(l_new);
 960 }
 961
 962 static void lease_delete(struct lease *l)
 963 {
 964         struct dhcp_assignment *a, *tmp;
 965
 966         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list)
 967                 free_assignment(a);
 968
 969         free_lease(l);
 970 }
 971
 972 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
 973                          struct vlist_node *node_old)
 974 {
 975         struct lease *lease_new = container_of(node_new, struct lease, node);
 976         struct lease *lease_old = container_of(node_old, struct lease, node);
 977
 978         if (node_old && node_new)
 979                 lease_change_config(lease_old, lease_new);
 980         else if (node_old)
 981                 lease_delete(lease_old);
 982 }
 983
 984 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
 985 {
 986         struct lease *l;
 987
 988         vlist_for_each_element(&leases, l, node) {
 989                 if (l->duid_len == len && !memcmp(l->duid, duid, len))
 990                         return l;
 991         }
 992
 993         return NULL;
 994 }
 995
 996 struct lease *config_find_lease_by_mac(const uint8_t *mac)
 997 {
 998         struct lease *l;
 999
1000         vlist_for_each_element(&leases, l, node) {
1001                 if (!memcmp(l->mac.ether_addr_octet, mac,
1002                             sizeof(l->mac.ether_addr_octet)))
1003                         return l;
1004         }
1005
1006         return NULL;
1007 }
1008
1009 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
1010 {
1011         struct lease *l;
1012
1013         vlist_for_each_element(&leases, l, node) {
1014                 if (l->hostid == hostid)
1015                         return l;
1016         }
1017
1018         return NULL;
1019 }
1020
1021 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
1022 {
1023         struct lease *l;
1024
1025         vlist_for_each_element(&leases, l, node) {
1026                 if (l->ipaddr == ipaddr)
1027                         return l;
1028         }
1029
1030         return NULL;
1031 }
1032
1033 void odhcpd_reload(void)
1034 {
1035         struct uci_context *uci = uci_alloc_context();
1036         struct interface *master = NULL, *i, *tmp;
1037
1038         if (!uci)
1039                 return;
1040
1041         vlist_update(&leases);
1042         avl_for_each_element(&interfaces, i, avl)
1043                 clean_interface(i);
1044
1045         struct uci_package *dhcp = NULL;
1046         if (!uci_load(uci, "dhcp", &dhcp)) {
1047                 struct uci_element *e;
1048
1049                 /* 1. Global settings */
1050                 uci_foreach_element(&dhcp->sections, e) {
1051                         struct uci_section *s = uci_to_section(e);
1052                         if (!strcmp(s->type, "odhcpd"))
1053                                 set_config(s);
1054                 }
1055
1056                 /* 2. DHCP pools */
1057                 uci_foreach_element(&dhcp->sections, e) {
1058                         struct uci_section *s = uci_to_section(e);
1059                         if (!strcmp(s->type, "dhcp"))
1060                                 set_interface(s);
1061                 }
1062
1063                 /* 3. Static leases */
1064                 uci_foreach_element(&dhcp->sections, e) {
1065                         struct uci_section* s = uci_to_section(e);
1066                         if (!strcmp(s->type, "host"))
1067                                 set_lease(s);
1068                 }
1069         }
1070
1071         if (config.dhcp_statefile) {
1072                 char *path = strdup(config.dhcp_statefile);
1073
1074                 mkdir_p(dirname(path), 0755);
1075                 free(path);
1076         }
1077
1078         vlist_flush(&leases);
1079
1080 #ifdef WITH_UBUS
1081         ubus_apply_network();
1082 #endif
1083
1084         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
1085
1086         /* Test for */
1087         avl_for_each_element(&interfaces, i, avl) {
1088                 if (i->master)
1089                         continue;
1090
1091                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
1092                         any_dhcpv6_slave = true;
1093
1094                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
1095                         any_ra_slave = true;
1096
1097                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
1098                         any_ndp_slave = true;
1099         }
1100
1101         /* Evaluate hybrid mode for master */
1102         avl_for_each_element(&interfaces, i, avl) {
1103                 if (!i->master)
1104                         continue;
1105
1106                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1107 #ifdef WITH_UBUS
1108                 if (!ubus_has_prefix(i->name, i->ifname))
1109                         hybrid_mode = MODE_RELAY;
1110 #endif
1111
1112                 if (i->dhcpv6 == MODE_HYBRID)
1113                         i->dhcpv6 = hybrid_mode;
1114
1115                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1116                         i->dhcpv6 = MODE_DISABLED;
1117
1118                 if (i->ra == MODE_HYBRID)
1119                         i->ra = hybrid_mode;
1120
1121                 if (i->ra == MODE_RELAY && !any_ra_slave)
1122                         i->ra = MODE_DISABLED;
1123
1124                 if (i->ndp == MODE_HYBRID)
1125                         i->ndp = hybrid_mode;
1126
1127                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1128                         i->ndp = MODE_DISABLED;
1129
1130                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1131                         master = i;
1132         }
1133
1134
1135         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1136                 if (i->inuse) {
1137                         /* Resolve hybrid mode */
1138                         if (i->dhcpv6 == MODE_HYBRID)
1139                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1140                                                 MODE_RELAY : MODE_SERVER;
1141
1142                         if (i->ra == MODE_HYBRID)
1143                                 i->ra = (master && master->ra == MODE_RELAY) ?
1144                                                 MODE_RELAY : MODE_SERVER;
1145
1146                         if (i->ndp == MODE_HYBRID)
1147                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
1148                                                 MODE_RELAY : MODE_DISABLED;
1149
1150                         router_setup_interface(i, i->ra != MODE_DISABLED);
1151                         dhcpv6_setup_interface(i, i->dhcpv6 != MODE_DISABLED);
1152                         ndp_setup_interface(i, i->ndp != MODE_DISABLED);
1153 #ifdef DHCPV4_SUPPORT
1154                         dhcpv4_setup_interface(i, i->dhcpv4 != MODE_DISABLED);
1155 #endif
1156                 } else
1157                         close_interface(i);
1158         }
1159
1160         uci_unload(uci, dhcp);
1161         uci_free_context(uci);
1162 }
1163
1164 static void handle_signal(int signal)
1165 {
1166         char b[1] = {0};
1167
1168         if (signal == SIGHUP) {
1169                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1170         } else
1171                 uloop_end();
1172 }
1173
1174 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1175 {
1176         char b[512];
1177         if (read(u->fd, b, sizeof(b)) < 0) {}
1178
1179         odhcpd_reload();
1180 }
1181
1182 static struct uloop_fd reload_fd = { .fd = -1, .cb = reload_cb };
1183
1184 void odhcpd_run(void)
1185 {
1186         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1187
1188         reload_fd.fd = reload_pipe[0];
1189         uloop_fd_add(&reload_fd, ULOOP_READ);
1190
1191         signal(SIGTERM, handle_signal);
1192         signal(SIGINT, handle_signal);
1193         signal(SIGHUP, handle_signal);
1194
1195 #ifdef WITH_UBUS
1196         while (ubus_init())
1197                 sleep(1);
1198 #endif
1199
1200         odhcpd_reload();
1201         uloop_run();
1202 }