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 <string.h>
   8 #include <sys/stat.h>
   9
  10 #include <uci.h>
  11 #include <uci_blob.h>
  12
  13 #include "odhcpd.h"
  14
  15 static struct blob_buf b;
  16 static int reload_pipe[2];
  17 struct list_head leases = LIST_HEAD_INIT(leases);
  18 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  19 struct config config = {false, NULL, NULL};
  20
  21 enum {
  22         IFACE_ATTR_INTERFACE,
  23         IFACE_ATTR_IFNAME,
  24         IFACE_ATTR_NETWORKID,
  25         IFACE_ATTR_DYNAMICDHCP,
  26         IFACE_ATTR_IGNORE,
  27         IFACE_ATTR_LEASETIME,
  28         IFACE_ATTR_LIMIT,
  29         IFACE_ATTR_START,
  30         IFACE_ATTR_MASTER,
  31         IFACE_ATTR_UPSTREAM,
  32         IFACE_ATTR_RA,
  33         IFACE_ATTR_DHCPV4,
  34         IFACE_ATTR_DHCPV6,
  35         IFACE_ATTR_NDP,
  36         IFACE_ATTR_ROUTER,
  37         IFACE_ATTR_DNS,
  38         IFACE_ATTR_DOMAIN,
  39         IFACE_ATTR_FILTER_CLASS,
  40         IFACE_ATTR_DHCPV6_RAW,
  41         IFACE_ATTR_RA_DEFAULT,
  42         IFACE_ATTR_RA_MANAGEMENT,
  43         IFACE_ATTR_RA_OFFLINK,
  44         IFACE_ATTR_RA_PREFERENCE,
  45         IFACE_ATTR_RA_ADVROUTER,
  46         IFACE_ATTR_RA_MAXINTERVAL,
  47         IFACE_ATTR_PD_MANAGER,
  48         IFACE_ATTR_PD_CER,
  49         IFACE_ATTR_NDPROXY_ROUTING,
  50         IFACE_ATTR_NDPROXY_SLAVE,
  51         IFACE_ATTR_MAX
  52 };
  53
  54 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  55         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  56         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  57         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  58         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  59         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  60         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  62         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  63         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  64         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  70         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  71         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  72         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  77         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  78         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  79         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  81         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  82         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  83         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  84 };
  85
  86 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  87         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  90 };
  91
  92 const struct uci_blob_param_list interface_attr_list = {
  93         .n_params = IFACE_ATTR_MAX,
  94         .params = iface_attrs,
  95         .info = iface_attr_info,
  96 };
  97
  98 enum {
  99         LEASE_ATTR_IP,
 100         LEASE_ATTR_MAC,
 101         LEASE_ATTR_DUID,
 102         LEASE_ATTR_HOSTID,
 103         LEASE_ATTR_LEASETIME,
 104         LEASE_ATTR_NAME,
 105         LEASE_ATTR_MAX
 106 };
 107
 108 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 109         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 110         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 111         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 112         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 113         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 114         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 115 };
 116
 117 const struct uci_blob_param_list lease_attr_list = {
 118         .n_params = LEASE_ATTR_MAX,
 119         .params = lease_attrs,
 120 };
 121
 122 enum {
 123         ODHCPD_ATTR_MAINDHCP,
 124         ODHCPD_ATTR_LEASEFILE,
 125         ODHCPD_ATTR_LEASETRIGGER,
 126         ODHCPD_ATTR_MAX
 127 };
 128
 129 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 130         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 131         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 132         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 133 };
 134
 135 const struct uci_blob_param_list odhcpd_attr_list = {
 136         .n_params = ODHCPD_ATTR_MAX,
 137         .params = odhcpd_attrs,
 138 };
 139
 140 static int mkdir_p(char *dir, mode_t mask)
 141 {
 142         char *l = strrchr(dir, '/');
 143         int ret;
 144
 145         if (!l)
 146                 return 0;
 147
 148         *l = '\0';
 149
 150         if (mkdir_p(dir, mask))
 151                 return -1;
 152
 153         *l = '/';
 154
 155         ret = mkdir(dir, mask);
 156         if (ret && errno == EEXIST)
 157                 return 0;
 158
 159         if (ret)
 160                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 161
 162         return ret;
 163 }
 164
 165 static void free_lease(struct lease *l)
 166 {
 167         if (l->head.next)
 168                 list_del(&l->head);
 169
 170         free(l->duid);
 171         free(l);
 172 }
 173
 174 static struct interface* get_interface(const char *name)
 175 {
 176         struct interface *c;
 177         list_for_each_entry(c, &interfaces, head)
 178                 if (!strcmp(c->name, name))
 179                         return c;
 180         return NULL;
 181 }
 182
 183 static void set_interface_defaults(struct interface *iface)
 184 {
 185         iface->managed = 1;
 186         iface->learn_routes = 1;
 187 }
 188
 189 static void clean_interface(struct interface *iface)
 190 {
 191         free(iface->dns);
 192         free(iface->search);
 193         free(iface->upstream);
 194         free(iface->dhcpv4_router);
 195         free(iface->dhcpv4_dns);
 196         free(iface->dhcpv6_raw);
 197         free(iface->filter_class);
 198         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 199         set_interface_defaults(iface);
 200 }
 201
 202 static void close_interface(struct interface *iface)
 203 {
 204         if (iface->head.next)
 205                 list_del(&iface->head);
 206
 207         setup_router_interface(iface, false);
 208         setup_dhcpv6_interface(iface, false);
 209         setup_ndp_interface(iface, false);
 210         setup_dhcpv4_interface(iface, false);
 211
 212         clean_interface(iface);
 213         free(iface);
 214 }
 215
 216 static int parse_mode(const char *mode)
 217 {
 218         if (!strcmp(mode, "disabled"))
 219                 return RELAYD_DISABLED;
 220         else if (!strcmp(mode, "server"))
 221                 return RELAYD_SERVER;
 222         else if (!strcmp(mode, "relay"))
 223                 return RELAYD_RELAY;
 224         else if (!strcmp(mode, "hybrid"))
 225                 return RELAYD_HYBRID;
 226         else
 227                 return -1;
 228 }
 229
 230 static void set_config(struct uci_section *s)
 231 {
 232         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 233
 234         blob_buf_init(&b, 0);
 235         uci_to_blob(&b, s, &odhcpd_attr_list);
 236         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 237
 238         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 239                 config.legacy = blobmsg_get_bool(c);
 240
 241         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 242                 free(config.dhcp_statefile);
 243                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 244         }
 245
 246         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 247                 free(config.dhcp_cb);
 248                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 249         }
 250 }
 251
 252 static double parse_leasetime(struct blob_attr *c) {
 253         char *val = blobmsg_get_string(c), *endptr = NULL;
 254         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 255
 256         if (time && endptr && endptr[0]) {
 257                 if (endptr[0] == 's')
 258                         time *= 1;
 259                 else if (endptr[0] == 'm')
 260                         time *= 60;
 261                 else if (endptr[0] == 'h')
 262                         time *= 3600;
 263                 else if (endptr[0] == 'd')
 264                         time *= 24 * 3600;
 265                 else if (endptr[0] == 'w')
 266                         time *= 7 * 24 * 3600;
 267                 else
 268                         goto err;
 269         }
 270
 271         if (time >= 60)
 272                 return time;
 273
 274         return 0;
 275
 276 err:
 277         return -1;
 278 }
 279
 280 static int set_lease(struct uci_section *s)
 281 {
 282         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 283
 284         blob_buf_init(&b, 0);
 285         uci_to_blob(&b, s, &lease_attr_list);
 286         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 287
 288         size_t hostlen = 1;
 289         if ((c = tb[LEASE_ATTR_NAME]))
 290                 hostlen = blobmsg_data_len(c);
 291
 292         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 293         if (!lease)
 294                 goto err;
 295
 296         if (hostlen > 1)
 297                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 298
 299         if ((c = tb[LEASE_ATTR_IP]))
 300                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 301                         goto err;
 302
 303         if ((c = tb[LEASE_ATTR_MAC]))
 304                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 305                         goto err;
 306
 307         if ((c = tb[LEASE_ATTR_DUID])) {
 308                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 309                 lease->duid = malloc(duidlen);
 310                 if (!lease->duid)
 311                         goto err;
 312
 313                 ssize_t len = odhcpd_unhexlify(lease->duid,
 314                                 duidlen, blobmsg_get_string(c));
 315
 316                 if (len < 0)
 317                         goto err;
 318
 319                 lease->duid_len = len;
 320         }
 321
 322         if ((c = tb[LEASE_ATTR_HOSTID])) {
 323                 errno = 0;
 324                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 325                 if (errno)
 326                         goto err;
 327         }
 328
 329         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 330                 double time = parse_leasetime(c);
 331                 if (time < 0)
 332                         goto err;
 333
 334                 if (time >= 60)
 335                         lease->dhcpv4_leasetime = time;
 336         }
 337
 338         list_add(&lease->head, &leases);
 339         return 0;
 340
 341 err:
 342         if (lease)
 343                 free_lease(lease);
 344
 345         return -1;
 346 }
 347
 348 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 349 {
 350         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 351         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 352
 353         if (tb[IFACE_ATTR_INTERFACE])
 354                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 355
 356         if (!name)
 357                 return -1;
 358
 359         struct interface *iface = get_interface(name);
 360         if (!iface) {
 361                 iface = calloc(1, sizeof(*iface));
 362                 if (!iface)
 363                         return -1;
 364
 365                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 366
 367                 set_interface_defaults(iface);
 368
 369                 list_add(&iface->head, &interfaces);
 370                 overwrite = true;
 371         }
 372
 373         const char *ifname = NULL;
 374         if (overwrite) {
 375                 if ((c = tb[IFACE_ATTR_IFNAME]))
 376                         ifname = blobmsg_get_string(c);
 377                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 378                         ifname = blobmsg_get_string(c);
 379         }
 380
 381 #ifdef WITH_UBUS
 382         if (overwrite || !iface->ifname[0])
 383                 ifname = ubus_get_ifname(name);
 384 #endif
 385
 386         if (!iface->ifname[0] && !ifname)
 387                 goto err;
 388
 389         if (ifname)
 390                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 391
 392         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 393                 goto err;
 394
 395         iface->inuse = true;
 396
 397         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 398                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 399
 400         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 401                 iface->ignore = blobmsg_get_bool(c);
 402
 403         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 404                 double time = parse_leasetime(c);
 405                 if (time < 0)
 406                         goto err;
 407
 408                 if (time >= 60)
 409                         iface->dhcpv4_leasetime = time;
 410         }
 411
 412         if ((c = tb[IFACE_ATTR_START])) {
 413                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 414
 415                 if (config.legacy)
 416                         iface->dhcpv4 = RELAYD_SERVER;
 417         }
 418
 419         if ((c = tb[IFACE_ATTR_LIMIT]))
 420                 iface->dhcpv4_end.s_addr = htonl(
 421                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 422
 423         if ((c = tb[IFACE_ATTR_MASTER]))
 424                 iface->master = blobmsg_get_bool(c);
 425
 426         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 427                 struct blob_attr *cur;
 428                 unsigned rem;
 429
 430                 blobmsg_for_each_attr(cur, c, rem) {
 431                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 432                                 continue;
 433
 434                         iface->upstream = realloc(iface->upstream,
 435                                         iface->upstream_len + blobmsg_data_len(cur));
 436                         if (!iface->upstream)
 437                                 goto err;
 438
 439                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 440                         iface->upstream_len += blobmsg_data_len(cur);
 441                 }
 442         }
 443
 444         int mode;
 445         if ((c = tb[IFACE_ATTR_RA])) {
 446                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 447                         iface->ra = mode;
 448                 else
 449                         goto err;
 450         }
 451
 452         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 453                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 454                         iface->dhcpv4 = mode;
 455                 else
 456                         goto err;
 457         }
 458
 459         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 460                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 461                         iface->dhcpv6 = mode;
 462                 else
 463                         goto err;
 464         }
 465
 466         if ((c = tb[IFACE_ATTR_NDP])) {
 467                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 468                         iface->ndp = mode;
 469                 else
 470                         goto err;
 471         }
 472
 473         if ((c = tb[IFACE_ATTR_ROUTER])) {
 474                 struct blob_attr *cur;
 475                 unsigned rem;
 476
 477                 blobmsg_for_each_attr(cur, c, rem) {
 478                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 479                                 continue;
 480
 481                         struct in_addr addr4;
 482                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 483                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 484                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 485                                 if (!iface->dhcpv4_router)
 486                                         goto err;
 487
 488                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 489                         } else
 490                                 goto err;
 491                 }
 492         }
 493
 494         if ((c = tb[IFACE_ATTR_DNS])) {
 495                 struct blob_attr *cur;
 496                 unsigned rem;
 497
 498                 iface->always_rewrite_dns = true;
 499                 blobmsg_for_each_attr(cur, c, rem) {
 500                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 501                                 continue;
 502
 503                         struct in_addr addr4;
 504                         struct in6_addr addr6;
 505                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 506                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 507                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 508                                 if (!iface->dhcpv4_dns)
 509                                         goto err;
 510
 511                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 512                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 513                                 iface->dns = realloc(iface->dns,
 514                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 515                                 if (!iface->dns)
 516                                         goto err;
 517
 518                                 iface->dns[iface->dns_cnt - 1] = addr6;
 519                         } else
 520                                 goto err;
 521                 }
 522         }
 523
 524         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 525                 struct blob_attr *cur;
 526                 unsigned rem;
 527
 528                 blobmsg_for_each_attr(cur, c, rem) {
 529                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 530                                 continue;
 531
 532                         uint8_t buf[256];
 533                         char *domain = blobmsg_get_string(cur);
 534                         size_t domainlen = strlen(domain);
 535                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 536                                 domain[domainlen - 1] = 0;
 537
 538                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 539                         if (len <= 0)
 540                                 goto err;
 541
 542                         iface->search = realloc(iface->search, iface->search_len + len);
 543                         if (!iface->search)
 544                                 goto err;
 545
 546                         memcpy(&iface->search[iface->search_len], buf, len);
 547                         iface->search_len += len;
 548                 }
 549         }
 550
 551         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 552                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 553                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 554         }
 555
 556         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 557                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 558                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 559                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 560         }
 561
 562         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 563                 iface->default_router = blobmsg_get_u32(c);
 564
 565         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 566                 iface->managed = blobmsg_get_u32(c);
 567
 568         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 569                 iface->ra_not_onlink = blobmsg_get_bool(c);
 570
 571         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 572                 iface->ra_advrouter = blobmsg_get_bool(c);
 573
 574         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 575                 iface->ra_maxinterval = blobmsg_get_u32(c);
 576
 577         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 578                 const char *prio = blobmsg_get_string(c);
 579
 580                 if (!strcmp(prio, "high"))
 581                         iface->route_preference = 1;
 582                 else if (!strcmp(prio, "low"))
 583                         iface->route_preference = -1;
 584                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 585                         iface->route_preference = 0;
 586                 else
 587                         goto err;
 588         }
 589
 590         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 591                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 592                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 593
 594         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 595                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 596                 goto err;
 597
 598         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 599                 iface->learn_routes = blobmsg_get_bool(c);
 600
 601         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 602                 iface->external = blobmsg_get_bool(c);
 603
 604         return 0;
 605
 606 err:
 607         close_interface(iface);
 608         return -1;
 609 }
 610
 611 static int set_interface(struct uci_section *s)
 612 {
 613         blob_buf_init(&b, 0);
 614         uci_to_blob(&b, s, &interface_attr_list);
 615
 616         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 617 }
 618
 619 void odhcpd_reload(void)
 620 {
 621         struct uci_context *uci = uci_alloc_context();
 622
 623         while (!list_empty(&leases))
 624                 free_lease(list_first_entry(&leases, struct lease, head));
 625
 626         struct interface *master = NULL, *i, *n;
 627
 628         if (!uci)
 629                 return;
 630
 631         list_for_each_entry(i, &interfaces, head)
 632                 clean_interface(i);
 633
 634         struct uci_package *dhcp = NULL;
 635         if (!uci_load(uci, "dhcp", &dhcp)) {
 636                 struct uci_element *e;
 637                 uci_foreach_element(&dhcp->sections, e) {
 638                         struct uci_section *s = uci_to_section(e);
 639                         if (!strcmp(s->type, "host"))
 640                                 set_lease(s);
 641                         else if (!strcmp(s->type, "odhcpd"))
 642                                 set_config(s);
 643                 }
 644
 645                 uci_foreach_element(&dhcp->sections, e) {
 646                         struct uci_section *s = uci_to_section(e);
 647                         if (!strcmp(s->type, "dhcp"))
 648                                 set_interface(s);
 649                 }
 650         }
 651
 652         if (config.dhcp_statefile) {
 653                 char *path = strdup(config.dhcp_statefile);
 654
 655                 mkdir_p(dirname(path), 0755);
 656                 free(path);
 657         }
 658
 659 #ifdef WITH_UBUS
 660         ubus_apply_network();
 661 #endif
 662
 663         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 664
 665         /* Test for */
 666         list_for_each_entry(i, &interfaces, head) {
 667                 if (i->master)
 668                         continue;
 669
 670                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 671                         any_dhcpv6_slave = true;
 672
 673                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 674                         any_ra_slave = true;
 675
 676                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 677                         any_ndp_slave = true;
 678         }
 679
 680         /* Evaluate hybrid mode for master */
 681         list_for_each_entry(i, &interfaces, head) {
 682                 if (!i->master)
 683                         continue;
 684
 685                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 686 #ifdef WITH_UBUS
 687                 if (!ubus_has_prefix(i->name, i->ifname))
 688                         hybrid_mode = RELAYD_RELAY;
 689 #endif
 690
 691                 if (i->dhcpv6 == RELAYD_HYBRID)
 692                         i->dhcpv6 = hybrid_mode;
 693
 694                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 695                         i->dhcpv6 = RELAYD_DISABLED;
 696
 697                 if (i->ra == RELAYD_HYBRID)
 698                         i->ra = hybrid_mode;
 699
 700                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 701                         i->ra = RELAYD_DISABLED;
 702
 703                 if (i->ndp == RELAYD_HYBRID)
 704                         i->ndp = hybrid_mode;
 705
 706                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 707                         i->ndp = RELAYD_DISABLED;
 708
 709                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 710                         master = i;
 711         }
 712
 713
 714         list_for_each_entry_safe(i, n, &interfaces, head) {
 715                 if (i->inuse) {
 716                         /* Resolve hybrid mode */
 717                         if (i->dhcpv6 == RELAYD_HYBRID)
 718                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 719                                                 RELAYD_RELAY : RELAYD_SERVER;
 720
 721                         if (i->ra == RELAYD_HYBRID)
 722                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 723                                                 RELAYD_RELAY : RELAYD_SERVER;
 724
 725                         if (i->ndp == RELAYD_HYBRID)
 726                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 727                                                 RELAYD_RELAY : RELAYD_DISABLED;
 728
 729                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 730                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 731                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 732                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 733                 } else {
 734                         close_interface(i);
 735                 }
 736         }
 737
 738         uci_unload(uci, dhcp);
 739         uci_free_context(uci);
 740 }
 741
 742 static void handle_signal(int signal)
 743 {
 744         char b[1] = {0};
 745
 746         if (signal == SIGHUP) {
 747                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 748         } else
 749                 uloop_end();
 750 }
 751
 752 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 753 {
 754         char b[512];
 755         if (read(u->fd, b, sizeof(b)) < 0) {}
 756
 757         odhcpd_reload();
 758 }
 759
 760 static struct uloop_fd reload_fd = { .cb = reload_cb };
 761
 762 void odhcpd_run(void)
 763 {
 764         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 765
 766         reload_fd.fd = reload_pipe[0];
 767         uloop_fd_add(&reload_fd, ULOOP_READ);
 768
 769         signal(SIGTERM, handle_signal);
 770         signal(SIGINT, handle_signal);
 771         signal(SIGHUP, handle_signal);
 772
 773 #ifdef WITH_UBUS
 774         while (init_ubus())
 775                 sleep(1);
 776 #endif
 777
 778         odhcpd_reload();
 779         uloop_run();
 780
 781         while (!list_empty(&interfaces))
 782                 close_interface(list_first_entry(&interfaces, struct interface, head));
 783 }
 784