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