interface-ip.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <unistd.h>
  18
  19 #include <arpa/inet.h>
  20
  21 #include "netifd.h"
  22 #include "device.h"
  23 #include "interface.h"
  24 #include "interface-ip.h"
  25 #include "proto.h"
  26 #include "ubus.h"
  27 #include "system.h"
  28
  29 enum {
  30         ROUTE_INTERFACE,
  31         ROUTE_TARGET,
  32         ROUTE_MASK,
  33         ROUTE_GATEWAY,
  34         ROUTE_METRIC,
  35         ROUTE_MTU,
  36         __ROUTE_MAX
  37 };
  38
  39 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  40         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  41         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  42         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  43         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  44         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  45         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  46 };
  47
  48 const struct config_param_list route_attr_list = {
  49         .n_params = __ROUTE_MAX,
  50         .params = route_attr,
  51 };
  52
  53
  54 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  55 static struct device_prefix *ula_prefix = NULL;
  56
  57
  58 static void
  59 clear_if_addr(union if_addr *a, int mask)
  60 {
  61         int m_bytes = (mask + 7) / 8;
  62         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  63         uint8_t *p = (uint8_t *) a;
  64
  65         if (m_bytes < sizeof(a))
  66                 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
  67
  68         p[m_bytes - 1] &= ~m_clear;
  69 }
  70
  71 static bool
  72 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  73 {
  74         union if_addr *p1, *p2;
  75
  76         p1 = alloca(sizeof(*a1));
  77         p2 = alloca(sizeof(*a2));
  78
  79         memcpy(p1, a1, sizeof(*a1));
  80         clear_if_addr(p1, mask);
  81         memcpy(p2, a2, sizeof(*a2));
  82         clear_if_addr(p2, mask);
  83
  84         return !memcmp(p1, p2, sizeof(*p1));
  85 }
  86
  87 static bool
  88 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
  89 {
  90         struct device_addr *addr;
  91
  92         vlist_for_each_element(&ip->addr, addr, node) {
  93                 if (!addr->enabled)
  94                         continue;
  95
  96                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
  97                         continue;
  98
  99                 if (!match_if_addr(&addr->addr, a, addr->mask))
 100                         continue;
 101
 102                 return true;
 103         }
 104
 105         return false;
 106 }
 107
 108 static void
 109 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 110                        bool v6, struct device_route **res)
 111 {
 112         struct device_route *route;
 113
 114         vlist_for_each_element(&ip->route, route, node) {
 115                 if (!route->enabled)
 116                         continue;
 117
 118                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 119                         continue;
 120
 121                 if (!match_if_addr(&route->addr, a, route->mask))
 122                         continue;
 123
 124                 if (!*res || route->mask < (*res)->mask)
 125                         *res = route;
 126         }
 127 }
 128
 129 static bool
 130 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 131 {
 132         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 133                __find_ip_addr_target(&iface->config_ip, a, v6);
 134 }
 135
 136 static void
 137 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 138                                bool v6, struct device_route **route)
 139 {
 140         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 141         __find_ip_route_target(&iface->config_ip, a, v6, route);
 142 }
 143
 144 struct interface *
 145 interface_ip_add_target_route(union if_addr *addr, bool v6)
 146 {
 147         struct interface *iface;
 148         struct device_route *route, *r_next = NULL;
 149         bool defaultroute_target = false;
 150         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 151
 152         route = calloc(1, sizeof(*route));
 153         if (!route)
 154                 return NULL;
 155
 156         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 157         route->mask = v6 ? 128 : 32;
 158         if (memcmp(&route->addr, addr, addrsize) == 0)
 159                 defaultroute_target = true;
 160         else
 161                 memcpy(&route->addr, addr, addrsize);
 162
 163         vlist_for_each_element(&interfaces, iface, node) {
 164                 /* look for locally addressable target first */
 165                 if (interface_ip_find_addr_target(iface, addr, v6))
 166                         goto done;
 167
 168                 /* do not stop at the first route, let the lookup compare
 169                  * masks to find the best match */
 170                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 171         }
 172
 173         if (!r_next) {
 174                 free(route);
 175                 return NULL;
 176         }
 177
 178         iface = r_next->iface;
 179         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 180         route->mtu = r_next->mtu;
 181         route->metric = r_next->metric;
 182
 183 done:
 184         route->iface = iface;
 185         if (defaultroute_target)
 186                 free(route);
 187         else
 188                 vlist_add(&iface->host_routes, &route->node, &route->flags);
 189         return iface;
 190 }
 191
 192 void
 193 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 194 {
 195         struct interface_ip_settings *ip;
 196         struct blob_attr *tb[__ROUTE_MAX], *cur;
 197         struct device_route *route;
 198         int af = v6 ? AF_INET6 : AF_INET;
 199
 200         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 201
 202         if (!iface) {
 203                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 204                         return;
 205
 206                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 207                 if (!iface)
 208                         return;
 209
 210                 ip = &iface->config_ip;
 211         } else {
 212                 ip = &iface->proto_ip;
 213         }
 214
 215         route = calloc(1, sizeof(*route));
 216         if (!route)
 217                 return;
 218
 219         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 220         route->mask = v6 ? 128 : 32;
 221         if ((cur = tb[ROUTE_MASK]) != NULL) {
 222                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 223                 if (route->mask > (v6 ? 128 : 32))
 224                         goto error;
 225         }
 226
 227         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 228                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 229                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 230                         goto error;
 231                 }
 232         }
 233
 234         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 235                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 236                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 237                         goto error;
 238                 }
 239         }
 240
 241         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 242                 route->metric = blobmsg_get_u32(cur);
 243                 route->flags |= DEVROUTE_METRIC;
 244         }
 245
 246         if ((cur = tb[ROUTE_MTU]) != NULL) {
 247                 route->mtu = blobmsg_get_u32(cur);
 248                 route->flags |= DEVROUTE_MTU;
 249         }
 250
 251         vlist_add(&ip->route, &route->node, &route->flags);
 252         return;
 253
 254 error:
 255         free(route);
 256 }
 257
 258 static int
 259 addr_cmp(const void *k1, const void *k2, void *ptr)
 260 {
 261         return memcmp(k1, k2, sizeof(struct device_addr) -
 262                       offsetof(struct device_addr, flags));
 263 }
 264
 265 static int
 266 route_cmp(const void *k1, const void *k2, void *ptr)
 267 {
 268         return memcmp(k1, k2, sizeof(struct device_route) -
 269                       offsetof(struct device_route, flags));
 270 }
 271
 272 static int
 273 prefix_cmp(const void *k1, const void *k2, void *ptr)
 274 {
 275         return memcmp(k1, k2, sizeof(struct device_prefix) -
 276                         offsetof(struct device_prefix, addr));
 277 }
 278
 279 static void
 280 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 281 {
 282         struct device *dev = iface->l3_dev.dev;
 283         struct device_route route;
 284
 285         memset(&route, 0, sizeof(route));
 286         route.iface = iface;
 287         route.flags = addr->flags;
 288         route.mask = addr->mask;
 289         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 290         clear_if_addr(&route.addr, route.mask);
 291
 292         if (add) {
 293                 route.flags |= DEVADDR_KERNEL;
 294                 system_del_route(dev, &route);
 295
 296                 route.flags &= ~DEVADDR_KERNEL;
 297                 route.metric = iface->metric;
 298                 system_add_route(dev, &route);
 299         } else {
 300                 system_del_route(dev, &route);
 301         }
 302 }
 303
 304 static void
 305 interface_update_proto_addr(struct vlist_tree *tree,
 306                             struct vlist_node *node_new,
 307                             struct vlist_node *node_old)
 308 {
 309         struct interface_ip_settings *ip;
 310         struct interface *iface;
 311         struct device *dev;
 312         struct device_addr *a_new = NULL, *a_old = NULL;
 313         bool keep = false;
 314
 315         ip = container_of(tree, struct interface_ip_settings, addr);
 316         iface = ip->iface;
 317         dev = iface->l3_dev.dev;
 318
 319         if (node_new) {
 320                 a_new = container_of(node_new, struct device_addr, node);
 321
 322                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 323                     !a_new->broadcast) {
 324
 325                         uint32_t mask = ~0;
 326                         uint32_t *a = (uint32_t *) &a_new->addr;
 327
 328                         mask >>= a_new->mask;
 329                         a_new->broadcast = *a | htonl(mask);
 330                 }
 331         }
 332
 333         if (node_old)
 334                 a_old = container_of(node_old, struct device_addr, node);
 335
 336         if (a_new && a_old) {
 337                 keep = true;
 338
 339                 if (a_old->flags != a_new->flags)
 340                         keep = false;
 341
 342                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 343                     a_new->broadcast != a_old->broadcast)
 344                         keep = false;
 345         }
 346
 347         if (node_old) {
 348                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 349                         interface_handle_subnet_route(iface, a_old, false);
 350                         system_del_address(dev, a_old);
 351                 }
 352                 free(a_old);
 353         }
 354
 355         if (node_new) {
 356                 a_new->enabled = true;
 357                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 358                         system_add_address(dev, a_new);
 359                         if (iface->metric)
 360                                 interface_handle_subnet_route(iface, a_new, true);
 361                 }
 362         }
 363 }
 364
 365 static bool
 366 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 367 {
 368         if (ip->no_defaultroute && !route->mask)
 369                 return false;
 370
 371         return ip->enabled;
 372 }
 373
 374 static void
 375 interface_update_proto_route(struct vlist_tree *tree,
 376                              struct vlist_node *node_new,
 377                              struct vlist_node *node_old)
 378 {
 379         struct interface_ip_settings *ip;
 380         struct interface *iface;
 381         struct device *dev;
 382         struct device_route *route_old, *route_new;
 383         bool keep = false;
 384
 385         ip = container_of(tree, struct interface_ip_settings, route);
 386         iface = ip->iface;
 387         dev = iface->l3_dev.dev;
 388
 389         route_old = container_of(node_old, struct device_route, node);
 390         route_new = container_of(node_new, struct device_route, node);
 391
 392         if (node_old && node_new)
 393                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 394
 395         if (node_old) {
 396                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 397                         system_del_route(dev, route_old);
 398                 free(route_old);
 399         }
 400
 401         if (node_new) {
 402                 bool _enabled = enable_route(ip, route_new);
 403
 404                 if (!(route_new->flags & DEVROUTE_METRIC))
 405                         route_new->metric = iface->metric;
 406
 407                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 408                         system_add_route(dev, route_new);
 409
 410                 route_new->iface = iface;
 411                 route_new->enabled = _enabled;
 412         }
 413 }
 414
 415 static void
 416 interface_update_host_route(struct vlist_tree *tree,
 417                              struct vlist_node *node_new,
 418                              struct vlist_node *node_old)
 419 {
 420         struct interface *iface;
 421         struct device *dev;
 422         struct device_route *route_old, *route_new;
 423
 424         iface = container_of(tree, struct interface, host_routes);
 425         dev = iface->l3_dev.dev;
 426
 427         route_old = container_of(node_old, struct device_route, node);
 428         route_new = container_of(node_new, struct device_route, node);
 429
 430         if (node_old) {
 431                 system_del_route(dev, route_old);
 432                 free(route_old);
 433         }
 434
 435         if (node_new)
 436                 system_add_route(dev, route_new);
 437 }
 438
 439
 440 static void
 441 interface_set_prefix_address(struct interface *iface, bool add,
 442                 struct device_prefix_assignment *assignment)
 443 {
 444         struct interface *uplink = assignment->prefix->iface;
 445         if (!iface->l3_dev.dev)
 446                 return;
 447
 448         struct device *l3_downlink = iface->l3_dev.dev;
 449
 450         struct device_addr addr;
 451         memset(&addr, 0, sizeof(addr));
 452         addr.addr.in6 = assignment->addr;
 453         addr.mask = assignment->length;
 454         addr.flags = DEVADDR_INET6;
 455         addr.preferred_until = assignment->prefix->preferred_until;
 456         addr.valid_until = assignment->prefix->valid_until;
 457
 458         if (!add) {
 459                 if (assignment->enabled)
 460                         system_del_address(l3_downlink, &addr);
 461         } else {
 462                 system_add_address(l3_downlink, &addr);
 463
 464                 if (uplink && uplink->l3_dev.dev) {
 465                         int mtu = system_update_ipv6_mtu(
 466                                         uplink->l3_dev.dev, 0);
 467                         if (mtu > 0)
 468                                 system_update_ipv6_mtu(l3_downlink, mtu);
 469                 }
 470         }
 471         assignment->enabled = add;
 472 }
 473
 474
 475 static void
 476 interface_update_prefix_assignments(struct vlist_tree *tree,
 477                              struct vlist_node *node_new,
 478                              struct vlist_node *node_old)
 479 {
 480         struct device_prefix_assignment *old, *new;
 481         old = container_of(node_old, struct device_prefix_assignment, node);
 482         new = container_of(node_new, struct device_prefix_assignment, node);
 483
 484         // Assignments persist across interface reloads etc.
 485         // so use indirection to avoid dangling pointers
 486         struct interface *iface = vlist_find(&interfaces,
 487                         (node_new) ? new->name : old->name, iface, node);
 488
 489         if (node_old && node_new) {
 490                 new->addr = old->addr;
 491                 new->length = old->length;
 492         } else if (node_old) {
 493                 if (iface)
 494                         interface_set_prefix_address(iface, false, old);
 495                 free(old);
 496         } else if (node_new) {
 497                 struct device_prefix *prefix = new->prefix;
 498                 uint64_t want = 1ULL << (64 - new->length);
 499                 prefix->avail &= ~(want - 1);
 500                 prefix->avail -= want;
 501
 502                 // Invert assignment
 503                 uint64_t assigned = ~prefix->avail;
 504                 assigned &= (1ULL << (64 - prefix->length)) - 1;
 505                 assigned &= ~(want - 1);
 506
 507                 // Assignment
 508                 new->addr = prefix->addr;
 509                 new->addr.s6_addr32[0] |=
 510                                 htonl(assigned >> 32);
 511                 new->addr.s6_addr32[1] |=
 512                                 htonl(assigned & 0xffffffffU);
 513                 new->addr.s6_addr[15] += 1;
 514         }
 515
 516         if (node_new && (iface->state == IFS_UP || iface->state == IFS_SETUP))
 517                 interface_set_prefix_address(iface, true, new);
 518 }
 519
 520
 521 void
 522 interface_ip_set_prefix_assignment(struct device_prefix *prefix,
 523                 struct interface *iface, uint8_t length)
 524 {
 525         struct device_prefix_assignment *assignment;
 526
 527         if (!length || length > 64) {
 528                 assignment = vlist_find(prefix->assignments, iface->name, assignment, node);
 529                 if (assignment)
 530                         interface_set_prefix_address(iface, false, assignment);
 531         } else {
 532                 uint64_t want = 1ULL << (64 - length);
 533                 char *name;
 534
 535                 if (prefix->avail < want && prefix->avail > 0) {
 536                         do {
 537                                 want = 1ULL << (64 - ++length);
 538                         } while (want > prefix->avail);
 539                 }
 540
 541                 if (prefix->avail < want)
 542                         return;
 543
 544                 assignment = calloc_a(sizeof(*assignment),
 545                         &name, strlen(iface->name) + 1);
 546                 assignment->prefix = prefix;
 547                 assignment->length = length;
 548                 assignment->name = strcpy(name, iface->name);
 549
 550                 vlist_add(prefix->assignments, &assignment->node, assignment->name);
 551         }
 552 }
 553
 554 static void
 555 interface_update_prefix(struct vlist_tree *tree,
 556                              struct vlist_node *node_new,
 557                              struct vlist_node *node_old)
 558 {
 559         struct device_prefix *prefix_old, *prefix_new;
 560         prefix_old = container_of(node_old, struct device_prefix, node);
 561         prefix_new = container_of(node_new, struct device_prefix, node);
 562
 563         struct device_route route;
 564         memset(&route, 0, sizeof(route));
 565         route.flags = DEVADDR_INET6;
 566         route.metric = INT32_MAX;
 567         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 568         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 569
 570         if (node_old && node_new) {
 571                 prefix_new->avail = prefix_old->avail;
 572                 prefix_new->assignments = prefix_old->assignments;
 573                 prefix_old->assignments = NULL;
 574
 575                 // Update all assignments
 576                 struct device_prefix_assignment *assignment;
 577                 struct vlist_tree *assignments = prefix_new->assignments;
 578                 vlist_for_each_element(assignments, assignment, node) {
 579                         assignment->prefix = prefix_new;
 580                         assignments->update(assignments,
 581                                         &assignment->node, &assignment->node);
 582                 }
 583         } else if (node_new) {
 584                 prefix_new->avail = 1ULL << (64 - prefix_new->length);
 585                 prefix_new->assignments = calloc(1, sizeof(*prefix_new->assignments));
 586                 vlist_init(prefix_new->assignments, avl_strcmp,
 587                                 interface_update_prefix_assignments);
 588
 589                 // Create initial assignments for interfaces
 590                 struct interface *iface;
 591                 vlist_for_each_element(&interfaces, iface, node)
 592                         interface_ip_set_prefix_assignment(prefix_new, iface,
 593                                         iface->proto_ip.assignment_length);
 594
 595                 // Set null-route to avoid routing loops
 596                 system_add_route(NULL, &route);
 597         }
 598
 599         if (node_old) {
 600                 // Remove null-route
 601                 system_del_route(NULL, &route);
 602
 603                 list_del(&prefix_old->head);
 604
 605                 if (prefix_old->assignments) {
 606                         vlist_flush_all(prefix_old->assignments);
 607                         free(prefix_old->assignments);
 608                 }
 609                 free(prefix_old);
 610         }
 611
 612         if (node_new)
 613                 list_add(&prefix_new->head, &prefixes);
 614 }
 615
 616 void
 617 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 618                 uint8_t length, time_t valid_until, time_t preferred_until)
 619 {
 620         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 621         prefix->length = length;
 622         prefix->addr = *addr;
 623         prefix->preferred_until = preferred_until;
 624         prefix->valid_until = valid_until;
 625         prefix->iface = iface;
 626
 627         if (iface)
 628                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 629         else
 630                 interface_update_prefix(NULL, &prefix->node, NULL);
 631 }
 632
 633 void
 634 interface_ip_set_ula_prefix(const char *prefix)
 635 {
 636         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 637         strncpy(buf, prefix, sizeof(buf) - 1);
 638         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 639
 640         struct in6_addr addr;
 641         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1)
 642                 return;
 643
 644         int length;
 645         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 646         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 647                 return;
 648
 649         if (ula_prefix && (!IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 650                         ula_prefix->length != length)) {
 651                 interface_update_prefix(NULL, NULL, &ula_prefix->node);
 652                 ula_prefix = NULL;
 653         }
 654
 655         interface_ip_add_device_prefix(NULL, &addr, length, 0, 0);
 656 }
 657
 658 void
 659 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 660 {
 661         struct dns_server *s;
 662
 663         s = calloc(1, sizeof(*s));
 664         if (!s)
 665                 return;
 666
 667         s->af = AF_INET;
 668         if (inet_pton(s->af, str, &s->addr.in))
 669                 goto add;
 670
 671         s->af = AF_INET6;
 672         if (inet_pton(s->af, str, &s->addr.in))
 673                 goto add;
 674
 675         free(s);
 676         return;
 677
 678 add:
 679         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 680           s->af == AF_INET6 ? '6' : '4', str);
 681         vlist_simple_add(&ip->dns_servers, &s->node);
 682 }
 683
 684 void
 685 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 686 {
 687         struct blob_attr *cur;
 688         int rem;
 689
 690         blobmsg_for_each_attr(cur, list, rem) {
 691                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 692                         continue;
 693
 694                 if (!blobmsg_check_attr(cur, NULL))
 695                         continue;
 696
 697                 interface_add_dns_server(ip, blobmsg_data(cur));
 698         }
 699 }
 700
 701 static void
 702 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 703 {
 704         struct dns_search_domain *s;
 705         int len = strlen(str);
 706
 707         s = calloc(1, sizeof(*s) + len + 1);
 708         if (!s)
 709                 return;
 710
 711         D(INTERFACE, "Add DNS search domain: %s\n", str);
 712         memcpy(s->name, str, len);
 713         vlist_simple_add(&ip->dns_search, &s->node);
 714 }
 715
 716 void
 717 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 718 {
 719         struct blob_attr *cur;
 720         int rem;
 721
 722         blobmsg_for_each_attr(cur, list, rem) {
 723                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 724                         continue;
 725
 726                 if (!blobmsg_check_attr(cur, NULL))
 727                         continue;
 728
 729                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 730         }
 731 }
 732
 733 static void
 734 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 735 {
 736         struct dns_server *s;
 737         struct dns_search_domain *d;
 738         const char *str;
 739         char buf[32];
 740
 741         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 742                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 743                 if (!str)
 744                         continue;
 745
 746                 fprintf(f, "nameserver %s\n", str);
 747         }
 748
 749         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 750                 fprintf(f, "search %s\n", d->name);
 751         }
 752 }
 753
 754 void
 755 interface_write_resolv_conf(void)
 756 {
 757         struct interface *iface;
 758         char *path = alloca(strlen(resolv_conf) + 5);
 759         FILE *f;
 760
 761         sprintf(path, "%s.tmp", resolv_conf);
 762         unlink(path);
 763         f = fopen(path, "w");
 764         if (!f) {
 765                 D(INTERFACE, "Failed to open %s for writing\n", path);
 766                 return;
 767         }
 768
 769         vlist_for_each_element(&interfaces, iface, node) {
 770                 if (iface->state != IFS_UP)
 771                         continue;
 772
 773                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 774                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 775                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 776                     vlist_simple_empty(&iface->config_ip.dns_servers))
 777                         continue;
 778
 779                 fprintf(f, "# Interface %s\n", iface->name);
 780                 write_resolv_conf_entries(f, &iface->config_ip);
 781                 if (!iface->proto_ip.no_dns)
 782                         write_resolv_conf_entries(f, &iface->proto_ip);
 783         }
 784         fclose(f);
 785         if (rename(path, resolv_conf) < 0) {
 786                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 787                 unlink(path);
 788         }
 789 }
 790
 791 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 792 {
 793         struct device_addr *addr;
 794         struct device_route *route;
 795         struct device *dev;
 796
 797         ip->enabled = enabled;
 798         dev = ip->iface->l3_dev.dev;
 799         if (!dev)
 800                 return;
 801
 802         vlist_for_each_element(&ip->addr, addr, node) {
 803                 if (addr->enabled == enabled)
 804                         continue;
 805
 806                 if (enabled)
 807                         system_add_address(dev, addr);
 808                 else
 809                         system_del_address(dev, addr);
 810                 addr->enabled = enabled;
 811         }
 812
 813         vlist_for_each_element(&ip->route, route, node) {
 814                 bool _enabled = enabled;
 815
 816                 if (!enable_route(ip, route))
 817                         _enabled = false;
 818
 819                 if (route->enabled == _enabled)
 820                         continue;
 821
 822                 if (_enabled) {
 823                         if (!(route->flags & DEVROUTE_METRIC))
 824                                 route->metric = ip->iface->metric;
 825
 826                         system_add_route(dev, route);
 827                 } else
 828                         system_del_route(dev, route);
 829                 route->enabled = _enabled;
 830         }
 831 }
 832
 833 void
 834 interface_ip_update_start(struct interface_ip_settings *ip)
 835 {
 836         if (ip != &ip->iface->config_ip) {
 837                 vlist_simple_update(&ip->dns_servers);
 838                 vlist_simple_update(&ip->dns_search);
 839         }
 840         vlist_update(&ip->route);
 841         vlist_update(&ip->addr);
 842         vlist_update(&ip->prefix);
 843 }
 844
 845 void
 846 interface_ip_update_complete(struct interface_ip_settings *ip)
 847 {
 848         vlist_simple_flush(&ip->dns_servers);
 849         vlist_simple_flush(&ip->dns_search);
 850         vlist_flush(&ip->route);
 851         vlist_flush(&ip->addr);
 852         vlist_flush(&ip->prefix);
 853         interface_write_resolv_conf();
 854 }
 855
 856 void
 857 interface_ip_flush(struct interface_ip_settings *ip)
 858 {
 859         if (ip == &ip->iface->proto_ip)
 860                 vlist_flush_all(&ip->iface->host_routes);
 861         vlist_simple_flush_all(&ip->dns_servers);
 862         vlist_simple_flush_all(&ip->dns_search);
 863         vlist_flush_all(&ip->route);
 864         vlist_flush_all(&ip->addr);
 865         vlist_flush_all(&ip->prefix);
 866 }
 867
 868 static void
 869 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 870 {
 871         ip->iface = iface;
 872         ip->enabled = true;
 873         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 874         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 875         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 876         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 877         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
 878 }
 879
 880 void
 881 interface_ip_init(struct interface *iface)
 882 {
 883         __interface_ip_init(&iface->proto_ip, iface);
 884         __interface_ip_init(&iface->config_ip, iface);
 885         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
 886 }