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
  16 #include "odhcpd.h"
  17
  18 static struct blob_buf b;
  19 static int reload_pipe[2];
  20 struct list_head leases = LIST_HEAD_INIT(leases);
  21 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  22 struct config config = {.legacy = false, .main_dhcpv4 = false,
  23                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  24                         .log_level = LOG_INFO};
  25
  26 enum {
  27         IFACE_ATTR_INTERFACE,
  28         IFACE_ATTR_IFNAME,
  29         IFACE_ATTR_NETWORKID,
  30         IFACE_ATTR_DYNAMICDHCP,
  31         IFACE_ATTR_IGNORE,
  32         IFACE_ATTR_LEASETIME,
  33         IFACE_ATTR_LIMIT,
  34         IFACE_ATTR_START,
  35         IFACE_ATTR_MASTER,
  36         IFACE_ATTR_UPSTREAM,
  37         IFACE_ATTR_RA,
  38         IFACE_ATTR_DHCPV4,
  39         IFACE_ATTR_DHCPV6,
  40         IFACE_ATTR_NDP,
  41         IFACE_ATTR_ROUTER,
  42         IFACE_ATTR_DNS,
  43         IFACE_ATTR_DOMAIN,
  44         IFACE_ATTR_FILTER_CLASS,
  45         IFACE_ATTR_DHCPV4_FORCERECONF,
  46         IFACE_ATTR_DHCPV6_RAW,
  47         IFACE_ATTR_DHCPV6_ASSIGNALL,
  48         IFACE_ATTR_RA_DEFAULT,
  49         IFACE_ATTR_RA_MANAGEMENT,
  50         IFACE_ATTR_RA_OFFLINK,
  51         IFACE_ATTR_RA_PREFERENCE,
  52         IFACE_ATTR_RA_ADVROUTER,
  53         IFACE_ATTR_RA_MININTERVAL,
  54         IFACE_ATTR_RA_MAXINTERVAL,
  55         IFACE_ATTR_RA_LIFETIME,
  56         IFACE_ATTR_RA_USELEASETIME,
  57         IFACE_ATTR_RA_REACHABLETIME,
  58         IFACE_ATTR_RA_RETRANSTIME,
  59         IFACE_ATTR_RA_HOPLIMIT,
  60         IFACE_ATTR_RA_MTU,
  61         IFACE_ATTR_PD_MANAGER,
  62         IFACE_ATTR_PD_CER,
  63         IFACE_ATTR_NDPROXY_ROUTING,
  64         IFACE_ATTR_NDPROXY_SLAVE,
  65         IFACE_ATTR_PREFIX_FILTER,
  66         IFACE_ATTR_MAX
  67 };
  68
  69 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  70         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  74         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  75         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  77         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  78         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  79         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  80         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  85         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  86         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  87         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  90         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  91         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  92         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  93         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  94         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  95         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  96         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  97         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  98         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  99         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 100         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 101         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 102         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 103         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 104         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 105         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 106         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 107         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 108         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 109 };
 110
 111 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 112         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 113         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 114         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 115 };
 116
 117 const struct uci_blob_param_list interface_attr_list = {
 118         .n_params = IFACE_ATTR_MAX,
 119         .params = iface_attrs,
 120         .info = iface_attr_info,
 121 };
 122
 123 enum {
 124         LEASE_ATTR_IP,
 125         LEASE_ATTR_MAC,
 126         LEASE_ATTR_DUID,
 127         LEASE_ATTR_HOSTID,
 128         LEASE_ATTR_LEASETIME,
 129         LEASE_ATTR_NAME,
 130         LEASE_ATTR_MAX
 131 };
 132
 133 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 134         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 135         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 136         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 137         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 138         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 139         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 140 };
 141
 142 const struct uci_blob_param_list lease_attr_list = {
 143         .n_params = LEASE_ATTR_MAX,
 144         .params = lease_attrs,
 145 };
 146
 147 enum {
 148         ODHCPD_ATTR_LEGACY,
 149         ODHCPD_ATTR_MAINDHCP,
 150         ODHCPD_ATTR_LEASEFILE,
 151         ODHCPD_ATTR_LEASETRIGGER,
 152         ODHCPD_ATTR_LOGLEVEL,
 153         ODHCPD_ATTR_MAX
 154 };
 155
 156 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 157         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 158         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 159         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 160         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 161         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 162 };
 163
 164 const struct uci_blob_param_list odhcpd_attr_list = {
 165         .n_params = ODHCPD_ATTR_MAX,
 166         .params = odhcpd_attrs,
 167 };
 168
 169 static int mkdir_p(char *dir, mode_t mask)
 170 {
 171         char *l = strrchr(dir, '/');
 172         int ret;
 173
 174         if (!l)
 175                 return 0;
 176
 177         *l = '\0';
 178
 179         if (mkdir_p(dir, mask))
 180                 return -1;
 181
 182         *l = '/';
 183
 184         ret = mkdir(dir, mask);
 185         if (ret && errno == EEXIST)
 186                 return 0;
 187
 188         if (ret)
 189                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 190
 191         return ret;
 192 }
 193
 194 static void free_lease(struct lease *l)
 195 {
 196         if (l->head.next)
 197                 list_del(&l->head);
 198
 199         free(l->duid);
 200         free(l);
 201 }
 202
 203 static struct interface* get_interface(const char *name)
 204 {
 205         struct interface *c;
 206         list_for_each_entry(c, &interfaces, head)
 207                 if (!strcmp(c->name, name))
 208                         return c;
 209         return NULL;
 210 }
 211
 212 static void set_interface_defaults(struct interface *iface)
 213 {
 214         iface->learn_routes = 1;
 215         iface->dhcpv4_leasetime = 43200;
 216         iface->dhcpv6_assignall = true;
 217         iface->ra_managed = RA_MANAGED_MFLAG;
 218         iface->ra_maxinterval = 600;
 219         iface->ra_mininterval = iface->ra_maxinterval/3;
 220         iface->ra_lifetime = -1;
 221 }
 222
 223 static void clean_interface(struct interface *iface)
 224 {
 225         free(iface->dns);
 226         free(iface->search);
 227         free(iface->upstream);
 228         free(iface->dhcpv4_router);
 229         free(iface->dhcpv4_dns);
 230         free(iface->dhcpv6_raw);
 231         free(iface->filter_class);
 232         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 233         set_interface_defaults(iface);
 234 }
 235
 236 static void close_interface(struct interface *iface)
 237 {
 238         if (iface->head.next)
 239                 list_del(&iface->head);
 240
 241         router_setup_interface(iface, false);
 242         dhcpv6_setup_interface(iface, false);
 243         ndp_setup_interface(iface, false);
 244 #ifdef DHCPV4_SUPPORT
 245         dhcpv4_setup_interface(iface, false);
 246 #endif
 247
 248         clean_interface(iface);
 249         free(iface->addr4);
 250         free(iface->addr6);
 251         free(iface->ifname);
 252         free(iface);
 253 }
 254
 255 static int parse_mode(const char *mode)
 256 {
 257         if (!strcmp(mode, "disabled"))
 258                 return MODE_DISABLED;
 259         else if (!strcmp(mode, "server"))
 260                 return MODE_SERVER;
 261         else if (!strcmp(mode, "relay"))
 262                 return MODE_RELAY;
 263         else if (!strcmp(mode, "hybrid"))
 264                 return MODE_HYBRID;
 265         else
 266                 return -1;
 267 }
 268
 269 static void set_config(struct uci_section *s)
 270 {
 271         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 272
 273         blob_buf_init(&b, 0);
 274         uci_to_blob(&b, s, &odhcpd_attr_list);
 275         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 276
 277         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 278                 config.legacy = blobmsg_get_bool(c);
 279
 280         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 281                 config.main_dhcpv4 = blobmsg_get_bool(c);
 282
 283         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 284                 free(config.dhcp_statefile);
 285                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 286         }
 287
 288         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 289                 free(config.dhcp_cb);
 290                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 291         }
 292
 293         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 294                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 295
 296                 if (config.log_level != log_level) {
 297                         config.log_level = log_level;
 298                         setlogmask(LOG_UPTO(config.log_level));
 299                 }
 300         }
 301 }
 302
 303 static double parse_leasetime(struct blob_attr *c) {
 304         char *val = blobmsg_get_string(c), *endptr = NULL;
 305         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 306
 307         if (time && endptr && endptr[0]) {
 308                 if (endptr[0] == 's')
 309                         time *= 1;
 310                 else if (endptr[0] == 'm')
 311                         time *= 60;
 312                 else if (endptr[0] == 'h')
 313                         time *= 3600;
 314                 else if (endptr[0] == 'd')
 315                         time *= 24 * 3600;
 316                 else if (endptr[0] == 'w')
 317                         time *= 7 * 24 * 3600;
 318                 else
 319                         goto err;
 320         }
 321
 322         if (time < 60)
 323                 time = 60;
 324
 325         return time;
 326
 327 err:
 328         return -1;
 329 }
 330
 331 static int set_lease(struct uci_section *s)
 332 {
 333         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 334
 335         blob_buf_init(&b, 0);
 336         uci_to_blob(&b, s, &lease_attr_list);
 337         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 338
 339         size_t hostlen = 1;
 340         if ((c = tb[LEASE_ATTR_NAME]))
 341                 hostlen = blobmsg_data_len(c);
 342
 343         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 344         if (!lease)
 345                 goto err;
 346
 347         if (hostlen > 1)
 348                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 349
 350         if ((c = tb[LEASE_ATTR_IP]))
 351                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 352                         goto err;
 353
 354         if ((c = tb[LEASE_ATTR_MAC]))
 355                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 356                         goto err;
 357
 358         if ((c = tb[LEASE_ATTR_DUID])) {
 359                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 360                 lease->duid = malloc(duidlen);
 361                 if (!lease->duid)
 362                         goto err;
 363
 364                 ssize_t len = odhcpd_unhexlify(lease->duid,
 365                                 duidlen, blobmsg_get_string(c));
 366
 367                 if (len < 0)
 368                         goto err;
 369
 370                 lease->duid_len = len;
 371         }
 372
 373         if ((c = tb[LEASE_ATTR_HOSTID])) {
 374                 errno = 0;
 375                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 376                 if (errno)
 377                         goto err;
 378         }
 379
 380         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 381                 double time = parse_leasetime(c);
 382                 if (time < 0)
 383                         goto err;
 384
 385                 lease->dhcpv4_leasetime = time;
 386         }
 387
 388         list_add(&lease->head, &leases);
 389         return 0;
 390
 391 err:
 392         if (lease)
 393                 free_lease(lease);
 394
 395         return -1;
 396 }
 397
 398 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 399 {
 400         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 401         bool get_addrs = false;
 402
 403         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 404
 405         if (tb[IFACE_ATTR_INTERFACE])
 406                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 407
 408         if (!name)
 409                 return -1;
 410
 411         struct interface *iface = get_interface(name);
 412         if (!iface) {
 413                 char *iface_name;
 414
 415                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 416                 if (!iface)
 417                         return -1;
 418
 419                 iface->name = strcpy(iface_name, name);
 420
 421                 set_interface_defaults(iface);
 422
 423                 list_add(&iface->head, &interfaces);
 424                 get_addrs = overwrite = true;
 425         }
 426
 427         const char *ifname = NULL;
 428         if (overwrite) {
 429                 if ((c = tb[IFACE_ATTR_IFNAME]))
 430                         ifname = blobmsg_get_string(c);
 431                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 432                         ifname = blobmsg_get_string(c);
 433         }
 434
 435 #ifdef WITH_UBUS
 436         if (overwrite || !iface->ifname)
 437                 ifname = ubus_get_ifname(name);
 438 #endif
 439
 440         if (!iface->ifname && !ifname)
 441                 goto err;
 442
 443         if (ifname) {
 444                 free(iface->ifname);
 445                 iface->ifname = strdup(ifname);
 446
 447                 if (!iface->ifname)
 448                         goto err;
 449
 450                 if (!iface->ifindex &&
 451                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 452                         goto err;
 453         }
 454
 455         if (get_addrs) {
 456                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 457                                                 true, &iface->addr6);
 458
 459                 if (len > 0)
 460                         iface->addr6_len = len;
 461
 462                 len = netlink_get_interface_addrs(iface->ifindex,
 463                                                 false, &iface->addr4);
 464                 if (len > 0)
 465                         iface->addr4_len = len;
 466         }
 467
 468         iface->inuse = true;
 469
 470         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 471                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 472
 473         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 474                 iface->ignore = blobmsg_get_bool(c);
 475
 476         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 477                 double time = parse_leasetime(c);
 478                 if (time < 0)
 479                         goto err;
 480
 481                 iface->dhcpv4_leasetime = time;
 482         }
 483
 484         if ((c = tb[IFACE_ATTR_START])) {
 485                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 486
 487                 if (config.main_dhcpv4 && config.legacy)
 488                         iface->dhcpv4 = MODE_SERVER;
 489         }
 490
 491         if ((c = tb[IFACE_ATTR_LIMIT]))
 492                 iface->dhcpv4_end.s_addr = htonl(
 493                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 494
 495         if ((c = tb[IFACE_ATTR_MASTER]))
 496                 iface->master = blobmsg_get_bool(c);
 497
 498         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 499                 struct blob_attr *cur;
 500                 unsigned rem;
 501
 502                 blobmsg_for_each_attr(cur, c, rem) {
 503                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 504                                 continue;
 505
 506                         iface->upstream = realloc(iface->upstream,
 507                                         iface->upstream_len + blobmsg_data_len(cur));
 508                         if (!iface->upstream)
 509                                 goto err;
 510
 511                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 512                         iface->upstream_len += blobmsg_data_len(cur);
 513                 }
 514         }
 515
 516         int mode;
 517         if ((c = tb[IFACE_ATTR_RA])) {
 518                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 519                         iface->ra = mode;
 520                 else
 521                         goto err;
 522         }
 523
 524         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 525                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 526                         if (config.main_dhcpv4)
 527                                 iface->dhcpv4 = mode;
 528                 }
 529                 else
 530                         goto err;
 531         }
 532
 533         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 534                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 535                         iface->dhcpv6 = mode;
 536                 else
 537                         goto err;
 538         }
 539
 540         if ((c = tb[IFACE_ATTR_NDP])) {
 541                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 542                         iface->ndp = mode;
 543                 else
 544                         goto err;
 545         }
 546
 547         if ((c = tb[IFACE_ATTR_ROUTER])) {
 548                 struct blob_attr *cur;
 549                 unsigned rem;
 550
 551                 blobmsg_for_each_attr(cur, c, rem) {
 552                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 553                                 continue;
 554
 555                         struct in_addr addr4;
 556                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 557                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 558                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 559                                 if (!iface->dhcpv4_router)
 560                                         goto err;
 561
 562                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 563                         } else
 564                                 goto err;
 565                 }
 566         }
 567
 568         if ((c = tb[IFACE_ATTR_DNS])) {
 569                 struct blob_attr *cur;
 570                 unsigned rem;
 571
 572                 iface->always_rewrite_dns = true;
 573                 blobmsg_for_each_attr(cur, c, rem) {
 574                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 575                                 continue;
 576
 577                         struct in_addr addr4;
 578                         struct in6_addr addr6;
 579                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 580                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 581                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 582                                 if (!iface->dhcpv4_dns)
 583                                         goto err;
 584
 585                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 586                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 587                                 iface->dns = realloc(iface->dns,
 588                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 589                                 if (!iface->dns)
 590                                         goto err;
 591
 592                                 iface->dns[iface->dns_cnt - 1] = addr6;
 593                         } else
 594                                 goto err;
 595                 }
 596         }
 597
 598         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 599                 struct blob_attr *cur;
 600                 unsigned rem;
 601
 602                 blobmsg_for_each_attr(cur, c, rem) {
 603                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 604                                 continue;
 605
 606                         uint8_t buf[256];
 607                         char *domain = blobmsg_get_string(cur);
 608                         size_t domainlen = strlen(domain);
 609                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 610                                 domain[domainlen - 1] = 0;
 611
 612                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 613                         if (len <= 0)
 614                                 goto err;
 615
 616                         iface->search = realloc(iface->search, iface->search_len + len);
 617                         if (!iface->search)
 618                                 goto err;
 619
 620                         memcpy(&iface->search[iface->search_len], buf, len);
 621                         iface->search_len += len;
 622                 }
 623         }
 624
 625         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 626                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 627                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 628         }
 629
 630         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 631                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 632
 633         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 634                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 635                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 636                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 637         }
 638
 639         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 640                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 641
 642         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 643                 iface->default_router = blobmsg_get_u32(c);
 644
 645         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 646                 iface->ra_managed = blobmsg_get_u32(c);
 647
 648         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 649                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 650                 if (ra_reachabletime > 3600000)
 651                         goto err;
 652
 653                 iface->ra_reachabletime = ra_reachabletime;
 654         }
 655
 656         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 657                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 658                 if (ra_retranstime > 60000)
 659                         goto err;
 660
 661                 iface->ra_retranstime = ra_retranstime;
 662         }
 663
 664         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 665                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 666                 if (ra_hoplimit > 255)
 667                         goto err;
 668
 669                 iface->ra_hoplimit = ra_hoplimit;
 670         }
 671
 672         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 673                 uint32_t ra_mtu = blobmsg_get_u32(c);
 674                 if (ra_mtu < 1280 || ra_mtu > 65535)
 675                         goto err;
 676
 677                 iface->ra_mtu = ra_mtu;
 678         }
 679
 680         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 681                 iface->ra_not_onlink = blobmsg_get_bool(c);
 682
 683         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 684                 iface->ra_advrouter = blobmsg_get_bool(c);
 685
 686         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 687                 iface->ra_mininterval =  blobmsg_get_u32(c);
 688
 689         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 690                 iface->ra_maxinterval = blobmsg_get_u32(c);
 691
 692         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 693                 iface->ra_lifetime = blobmsg_get_u32(c);
 694
 695         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 696                 iface->ra_useleasetime = blobmsg_get_bool(c);
 697
 698         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 699                 const char *prio = blobmsg_get_string(c);
 700
 701                 if (!strcmp(prio, "high"))
 702                         iface->route_preference = 1;
 703                 else if (!strcmp(prio, "low"))
 704                         iface->route_preference = -1;
 705                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 706                         iface->route_preference = 0;
 707                 else
 708                         goto err;
 709         }
 710
 711         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 712                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 713                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 714
 715         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 716                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 717                 goto err;
 718
 719         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 720                 iface->learn_routes = blobmsg_get_bool(c);
 721
 722         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 723                 iface->external = blobmsg_get_bool(c);
 724
 725         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 726                 const char *str = blobmsg_get_string(c);
 727                 char *astr = malloc(strlen(str) + 1);
 728                 char *delim;
 729                 int l;
 730                 if (!astr || !strcpy(astr, str) ||
 731                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 732                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 733                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0) {
 734                         iface->pio_filter_length = 0;
 735                 } else {
 736                         iface->pio_filter_length = l;
 737                 }
 738                 if (astr)
 739                         free(astr);
 740         }
 741
 742         return 0;
 743
 744 err:
 745         close_interface(iface);
 746         return -1;
 747 }
 748
 749 static int set_interface(struct uci_section *s)
 750 {
 751         blob_buf_init(&b, 0);
 752         uci_to_blob(&b, s, &interface_attr_list);
 753
 754         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 755 }
 756
 757 void odhcpd_reload(void)
 758 {
 759         struct uci_context *uci = uci_alloc_context();
 760
 761         while (!list_empty(&leases))
 762                 free_lease(list_first_entry(&leases, struct lease, head));
 763
 764         struct interface *master = NULL, *i, *n;
 765
 766         if (!uci)
 767                 return;
 768
 769         list_for_each_entry(i, &interfaces, head)
 770                 clean_interface(i);
 771
 772         struct uci_package *dhcp = NULL;
 773         if (!uci_load(uci, "dhcp", &dhcp)) {
 774                 struct uci_element *e;
 775                 uci_foreach_element(&dhcp->sections, e) {
 776                         struct uci_section *s = uci_to_section(e);
 777                         if (!strcmp(s->type, "host"))
 778                                 set_lease(s);
 779                         else if (!strcmp(s->type, "odhcpd"))
 780                                 set_config(s);
 781                 }
 782
 783                 uci_foreach_element(&dhcp->sections, e) {
 784                         struct uci_section *s = uci_to_section(e);
 785                         if (!strcmp(s->type, "dhcp"))
 786                                 set_interface(s);
 787                 }
 788         }
 789
 790         if (config.dhcp_statefile) {
 791                 char *path = strdup(config.dhcp_statefile);
 792
 793                 mkdir_p(dirname(path), 0755);
 794                 free(path);
 795         }
 796
 797 #ifdef WITH_UBUS
 798         ubus_apply_network();
 799 #endif
 800
 801         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 802
 803         /* Test for */
 804         list_for_each_entry(i, &interfaces, head) {
 805                 if (i->master)
 806                         continue;
 807
 808                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 809                         any_dhcpv6_slave = true;
 810
 811                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 812                         any_ra_slave = true;
 813
 814                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 815                         any_ndp_slave = true;
 816         }
 817
 818         /* Evaluate hybrid mode for master */
 819         list_for_each_entry(i, &interfaces, head) {
 820                 if (!i->master)
 821                         continue;
 822
 823                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
 824 #ifdef WITH_UBUS
 825                 if (!ubus_has_prefix(i->name, i->ifname))
 826                         hybrid_mode = MODE_RELAY;
 827 #endif
 828
 829                 if (i->dhcpv6 == MODE_HYBRID)
 830                         i->dhcpv6 = hybrid_mode;
 831
 832                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
 833                         i->dhcpv6 = MODE_DISABLED;
 834
 835                 if (i->ra == MODE_HYBRID)
 836                         i->ra = hybrid_mode;
 837
 838                 if (i->ra == MODE_RELAY && !any_ra_slave)
 839                         i->ra = MODE_DISABLED;
 840
 841                 if (i->ndp == MODE_HYBRID)
 842                         i->ndp = hybrid_mode;
 843
 844                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
 845                         i->ndp = MODE_DISABLED;
 846
 847                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
 848                         master = i;
 849         }
 850
 851
 852         list_for_each_entry_safe(i, n, &interfaces, head) {
 853                 if (i->inuse) {
 854                         /* Resolve hybrid mode */
 855                         if (i->dhcpv6 == MODE_HYBRID)
 856                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
 857                                                 MODE_RELAY : MODE_SERVER;
 858
 859                         if (i->ra == MODE_HYBRID)
 860                                 i->ra = (master && master->ra == MODE_RELAY) ?
 861                                                 MODE_RELAY : MODE_SERVER;
 862
 863                         if (i->ndp == MODE_HYBRID)
 864                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
 865                                                 MODE_RELAY : MODE_DISABLED;
 866
 867                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
 868                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
 869                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
 870 #ifdef DHCPV4_SUPPORT
 871                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
 872 #endif
 873                 } else
 874                         close_interface(i);
 875         }
 876
 877         uci_unload(uci, dhcp);
 878         uci_free_context(uci);
 879 }
 880
 881 static void handle_signal(int signal)
 882 {
 883         char b[1] = {0};
 884
 885         if (signal == SIGHUP) {
 886                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 887         } else
 888                 uloop_end();
 889 }
 890
 891 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 892 {
 893         char b[512];
 894         if (read(u->fd, b, sizeof(b)) < 0) {}
 895
 896         odhcpd_reload();
 897 }
 898
 899 static struct uloop_fd reload_fd = { .cb = reload_cb };
 900
 901 void odhcpd_run(void)
 902 {
 903         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 904
 905         reload_fd.fd = reload_pipe[0];
 906         uloop_fd_add(&reload_fd, ULOOP_READ);
 907
 908         signal(SIGTERM, handle_signal);
 909         signal(SIGINT, handle_signal);
 910         signal(SIGHUP, handle_signal);
 911
 912 #ifdef WITH_UBUS
 913         while (ubus_init())
 914                 sleep(1);
 915 #endif
 916
 917         odhcpd_reload();
 918         uloop_run();
 919
 920         while (!list_empty(&interfaces))
 921                 close_interface(list_first_entry(&interfaces, struct interface, head));
 922 }
 923