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_VALID,
  37         __ROUTE_MAX
  38 };
  39
  40 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  41         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  42         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  43         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  44         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  45         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  46         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  47         [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  48 };
  49
  50 const struct config_param_list route_attr_list = {
  51         .n_params = __ROUTE_MAX,
  52         .params = route_attr,
  53 };
  54
  55
  56 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  57 static struct device_prefix *ula_prefix = NULL;
  58 static struct uloop_timeout valid_until_timeout;
  59
  60
  61 static void
  62 clear_if_addr(union if_addr *a, int mask)
  63 {
  64         int m_bytes = (mask + 7) / 8;
  65         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  66         uint8_t *p = (uint8_t *) a;
  67
  68         if (m_bytes < sizeof(a))
  69                 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
  70
  71         p[m_bytes - 1] &= ~m_clear;
  72 }
  73
  74 static bool
  75 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  76 {
  77         union if_addr *p1, *p2;
  78
  79         p1 = alloca(sizeof(*a1));
  80         p2 = alloca(sizeof(*a2));
  81
  82         memcpy(p1, a1, sizeof(*a1));
  83         clear_if_addr(p1, mask);
  84         memcpy(p2, a2, sizeof(*a2));
  85         clear_if_addr(p2, mask);
  86
  87         return !memcmp(p1, p2, sizeof(*p1));
  88 }
  89
  90 static bool
  91 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
  92 {
  93         struct device_addr *addr;
  94
  95         vlist_for_each_element(&ip->addr, addr, node) {
  96                 if (!addr->enabled)
  97                         continue;
  98
  99                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 100                         continue;
 101
 102                 if (!match_if_addr(&addr->addr, a, addr->mask))
 103                         continue;
 104
 105                 return true;
 106         }
 107
 108         return false;
 109 }
 110
 111 static void
 112 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 113                        bool v6, struct device_route **res)
 114 {
 115         struct device_route *route;
 116
 117         vlist_for_each_element(&ip->route, route, node) {
 118                 if (!route->enabled)
 119                         continue;
 120
 121                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 122                         continue;
 123
 124                 if (!match_if_addr(&route->addr, a, route->mask))
 125                         continue;
 126
 127                 if (!*res || route->mask < (*res)->mask)
 128                         *res = route;
 129         }
 130 }
 131
 132 static bool
 133 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 134 {
 135         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 136                __find_ip_addr_target(&iface->config_ip, a, v6);
 137 }
 138
 139 static void
 140 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 141                                bool v6, struct device_route **route)
 142 {
 143         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 144         __find_ip_route_target(&iface->config_ip, a, v6, route);
 145 }
 146
 147 struct interface *
 148 interface_ip_add_target_route(union if_addr *addr, bool v6)
 149 {
 150         struct interface *iface;
 151         struct device_route *route, *r_next = NULL;
 152         bool defaultroute_target = false;
 153         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 154
 155         route = calloc(1, sizeof(*route));
 156         if (!route)
 157                 return NULL;
 158
 159         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 160         route->mask = v6 ? 128 : 32;
 161         if (memcmp(&route->addr, addr, addrsize) == 0)
 162                 defaultroute_target = true;
 163         else
 164                 memcpy(&route->addr, addr, addrsize);
 165
 166         vlist_for_each_element(&interfaces, iface, node) {
 167                 /* look for locally addressable target first */
 168                 if (interface_ip_find_addr_target(iface, addr, v6))
 169                         goto done;
 170
 171                 /* do not stop at the first route, let the lookup compare
 172                  * masks to find the best match */
 173                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 174         }
 175
 176         if (!r_next) {
 177                 free(route);
 178                 return NULL;
 179         }
 180
 181         iface = r_next->iface;
 182         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 183         route->mtu = r_next->mtu;
 184         route->metric = r_next->metric;
 185
 186 done:
 187         route->iface = iface;
 188         if (defaultroute_target)
 189                 free(route);
 190         else
 191                 vlist_add(&iface->host_routes, &route->node, &route->flags);
 192         return iface;
 193 }
 194
 195 void
 196 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 197 {
 198         struct interface_ip_settings *ip;
 199         struct blob_attr *tb[__ROUTE_MAX], *cur;
 200         struct device_route *route;
 201         int af = v6 ? AF_INET6 : AF_INET;
 202
 203         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 204
 205         if (!iface) {
 206                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 207                         return;
 208
 209                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 210                 if (!iface)
 211                         return;
 212
 213                 ip = &iface->config_ip;
 214         } else {
 215                 ip = &iface->proto_ip;
 216         }
 217
 218         route = calloc(1, sizeof(*route));
 219         if (!route)
 220                 return;
 221
 222         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 223         route->mask = v6 ? 128 : 32;
 224         if ((cur = tb[ROUTE_MASK]) != NULL) {
 225                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 226                 if (route->mask > (v6 ? 128 : 32))
 227                         goto error;
 228         }
 229
 230         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 231                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 232                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 233                         goto error;
 234                 }
 235         }
 236
 237         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 238                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 239                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 240                         goto error;
 241                 }
 242         }
 243
 244         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 245                 route->metric = blobmsg_get_u32(cur);
 246                 route->flags |= DEVROUTE_METRIC;
 247         }
 248
 249         if ((cur = tb[ROUTE_MTU]) != NULL) {
 250                 route->mtu = blobmsg_get_u32(cur);
 251                 route->flags |= DEVROUTE_MTU;
 252         }
 253
 254         if ((cur = tb[ROUTE_VALID]) != NULL)
 255                 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
 256
 257         vlist_add(&ip->route, &route->node, &route->flags);
 258         return;
 259
 260 error:
 261         free(route);
 262 }
 263
 264 static int
 265 addr_cmp(const void *k1, const void *k2, void *ptr)
 266 {
 267         return memcmp(k1, k2, sizeof(struct device_addr) -
 268                       offsetof(struct device_addr, flags));
 269 }
 270
 271 static int
 272 route_cmp(const void *k1, const void *k2, void *ptr)
 273 {
 274         return memcmp(k1, k2, sizeof(struct device_route) -
 275                       offsetof(struct device_route, flags));
 276 }
 277
 278 static int
 279 prefix_cmp(const void *k1, const void *k2, void *ptr)
 280 {
 281         return memcmp(k1, k2, sizeof(struct device_prefix) -
 282                         offsetof(struct device_prefix, addr));
 283 }
 284
 285 static void
 286 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 287 {
 288         struct device *dev = iface->l3_dev.dev;
 289         struct device_route route;
 290
 291         memset(&route, 0, sizeof(route));
 292         route.iface = iface;
 293         route.flags = addr->flags;
 294         route.mask = addr->mask;
 295         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 296         clear_if_addr(&route.addr, route.mask);
 297
 298         if (add) {
 299                 route.flags |= DEVADDR_KERNEL;
 300                 system_del_route(dev, &route);
 301
 302                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 303                         route.flags &= ~DEVADDR_KERNEL;
 304                         route.metric = iface->metric;
 305                         system_add_route(dev, &route);
 306                 }
 307         } else {
 308                 if (!(addr->flags & DEVADDR_OFFLINK))
 309                         system_del_route(dev, &route);
 310         }
 311 }
 312
 313 static void
 314 interface_update_proto_addr(struct vlist_tree *tree,
 315                             struct vlist_node *node_new,
 316                             struct vlist_node *node_old)
 317 {
 318         struct interface_ip_settings *ip;
 319         struct interface *iface;
 320         struct device *dev;
 321         struct device_addr *a_new = NULL, *a_old = NULL;
 322         bool keep = false;
 323
 324         ip = container_of(tree, struct interface_ip_settings, addr);
 325         iface = ip->iface;
 326         dev = iface->l3_dev.dev;
 327
 328         if (node_new) {
 329                 a_new = container_of(node_new, struct device_addr, node);
 330
 331                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 332                     !a_new->broadcast) {
 333
 334                         uint32_t mask = ~0;
 335                         uint32_t *a = (uint32_t *) &a_new->addr;
 336
 337                         mask >>= a_new->mask;
 338                         a_new->broadcast = *a | htonl(mask);
 339                 }
 340         }
 341
 342         if (node_old)
 343                 a_old = container_of(node_old, struct device_addr, node);
 344
 345         if (a_new && a_old) {
 346                 keep = true;
 347
 348                 if (a_old->flags != a_new->flags ||
 349                                 a_old->valid_until != a_new->valid_until ||
 350                                 a_old->preferred_until != a_new->preferred_until)
 351                         keep = false;
 352
 353                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 354                     a_new->broadcast != a_old->broadcast)
 355                         keep = false;
 356         }
 357
 358         if (node_old) {
 359                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 360                         interface_handle_subnet_route(iface, a_old, false);
 361                         system_del_address(dev, a_old);
 362                 }
 363                 free(a_old);
 364         }
 365
 366         if (node_new) {
 367                 a_new->enabled = true;
 368                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 369                         system_add_address(dev, a_new);
 370                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 371                                 interface_handle_subnet_route(iface, a_new, true);
 372                 }
 373         }
 374 }
 375
 376 static bool
 377 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 378 {
 379         if (ip->no_defaultroute && !route->mask)
 380                 return false;
 381
 382         return ip->enabled;
 383 }
 384
 385 static void
 386 interface_update_proto_route(struct vlist_tree *tree,
 387                              struct vlist_node *node_new,
 388                              struct vlist_node *node_old)
 389 {
 390         struct interface_ip_settings *ip;
 391         struct interface *iface;
 392         struct device *dev;
 393         struct device_route *route_old, *route_new;
 394         bool keep = false;
 395
 396         ip = container_of(tree, struct interface_ip_settings, route);
 397         iface = ip->iface;
 398         dev = iface->l3_dev.dev;
 399
 400         route_old = container_of(node_old, struct device_route, node);
 401         route_new = container_of(node_new, struct device_route, node);
 402
 403         if (node_old && node_new)
 404                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 405
 406         if (node_old) {
 407                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 408                         system_del_route(dev, route_old);
 409                 free(route_old);
 410         }
 411
 412         if (node_new) {
 413                 bool _enabled = enable_route(ip, route_new);
 414
 415                 if (!(route_new->flags & DEVROUTE_METRIC))
 416                         route_new->metric = iface->metric;
 417
 418                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 419                         system_add_route(dev, route_new);
 420
 421                 route_new->iface = iface;
 422                 route_new->enabled = _enabled;
 423         }
 424 }
 425
 426 static void
 427 interface_update_host_route(struct vlist_tree *tree,
 428                              struct vlist_node *node_new,
 429                              struct vlist_node *node_old)
 430 {
 431         struct interface *iface;
 432         struct device *dev;
 433         struct device_route *route_old, *route_new;
 434
 435         iface = container_of(tree, struct interface, host_routes);
 436         dev = iface->l3_dev.dev;
 437
 438         route_old = container_of(node_old, struct device_route, node);
 439         route_new = container_of(node_new, struct device_route, node);
 440
 441         if (node_old) {
 442                 system_del_route(dev, route_old);
 443                 free(route_old);
 444         }
 445
 446         if (node_new)
 447                 system_add_route(dev, route_new);
 448 }
 449
 450
 451 static void
 452 interface_set_prefix_address(struct interface *iface, bool add,
 453                 struct device_prefix_assignment *assignment)
 454 {
 455         struct interface *uplink = assignment->prefix->iface;
 456         if (!iface->l3_dev.dev)
 457                 return;
 458
 459         struct device *l3_downlink = iface->l3_dev.dev;
 460
 461         struct device_addr addr;
 462         memset(&addr, 0, sizeof(addr));
 463         addr.addr.in6 = assignment->addr;
 464         addr.mask = assignment->length;
 465         addr.flags = DEVADDR_INET6;
 466         addr.preferred_until = assignment->prefix->preferred_until;
 467         addr.valid_until = assignment->prefix->valid_until;
 468
 469         if (!add) {
 470                 if (assignment->enabled) {
 471                         time_t now = system_get_rtime();
 472                         addr.preferred_until = now;
 473                         if (!addr.valid_until || addr.valid_until - now > 7200)
 474                                 addr.valid_until = now + 7200;
 475                         system_add_address(l3_downlink, &addr);
 476                 }
 477         } else {
 478                 system_add_address(l3_downlink, &addr);
 479
 480                 if (uplink && uplink->l3_dev.dev) {
 481                         int mtu = system_update_ipv6_mtu(
 482                                         uplink->l3_dev.dev, 0);
 483                         if (mtu > 0)
 484                                 system_update_ipv6_mtu(l3_downlink, mtu);
 485                 }
 486         }
 487         assignment->enabled = add;
 488 }
 489
 490
 491 static void
 492 interface_update_prefix_assignments(struct vlist_tree *tree,
 493                              struct vlist_node *node_new,
 494                              struct vlist_node *node_old)
 495 {
 496         struct device_prefix_assignment *old, *new;
 497         old = container_of(node_old, struct device_prefix_assignment, node);
 498         new = container_of(node_new, struct device_prefix_assignment, node);
 499
 500         // Assignments persist across interface reloads etc.
 501         // so use indirection to avoid dangling pointers
 502         struct interface *iface = vlist_find(&interfaces,
 503                         (node_new) ? new->name : old->name, iface, node);
 504
 505         if (node_old && node_new) {
 506                 new->addr = old->addr;
 507                 new->length = old->length;
 508         } else if (node_old) {
 509                 if (iface)
 510                         interface_set_prefix_address(iface, false, old);
 511                 free(old);
 512         } else if (node_new) {
 513                 struct device_prefix *prefix = new->prefix;
 514                 uint64_t want = 1ULL << (64 - new->length);
 515                 prefix->avail &= ~(want - 1);
 516                 prefix->avail -= want;
 517
 518                 // Invert assignment
 519                 uint64_t assigned = ~prefix->avail;
 520                 assigned &= (1ULL << (64 - prefix->length)) - 1;
 521                 assigned &= ~(want - 1);
 522
 523                 // Assignment
 524                 new->addr = prefix->addr;
 525                 new->addr.s6_addr32[0] |=
 526                                 htonl(assigned >> 32);
 527                 new->addr.s6_addr32[1] |=
 528                                 htonl(assigned & 0xffffffffU);
 529                 new->addr.s6_addr[15] += 1;
 530         }
 531
 532         if (node_new && (iface->state == IFS_UP || iface->state == IFS_SETUP))
 533                 interface_set_prefix_address(iface, true, new);
 534 }
 535
 536
 537 void
 538 interface_ip_set_prefix_assignment(struct device_prefix *prefix,
 539                 struct interface *iface, uint8_t length)
 540 {
 541         struct device_prefix_assignment *assignment;
 542
 543         if (!length || length > 64) {
 544                 assignment = vlist_find(prefix->assignments, iface->name, assignment, node);
 545                 if (assignment)
 546                         interface_set_prefix_address(iface, false, assignment);
 547         } else {
 548                 uint64_t want = 1ULL << (64 - length);
 549                 char *name;
 550
 551                 if (prefix->avail < want && prefix->avail > 0) {
 552                         do {
 553                                 want = 1ULL << (64 - ++length);
 554                         } while (want > prefix->avail);
 555                 }
 556
 557                 if (prefix->avail < want)
 558                         return;
 559
 560                 assignment = calloc_a(sizeof(*assignment),
 561                         &name, strlen(iface->name) + 1);
 562                 assignment->prefix = prefix;
 563                 assignment->length = length;
 564                 assignment->name = strcpy(name, iface->name);
 565
 566                 vlist_add(prefix->assignments, &assignment->node, assignment->name);
 567         }
 568 }
 569
 570 static void
 571 interface_update_prefix(struct vlist_tree *tree,
 572                              struct vlist_node *node_new,
 573                              struct vlist_node *node_old)
 574 {
 575         struct device_prefix *prefix_old, *prefix_new;
 576         prefix_old = container_of(node_old, struct device_prefix, node);
 577         prefix_new = container_of(node_new, struct device_prefix, node);
 578
 579         struct device_route route;
 580         memset(&route, 0, sizeof(route));
 581         route.flags = DEVADDR_INET6;
 582         route.metric = INT32_MAX;
 583         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 584         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 585
 586         if (node_old && node_new) {
 587                 prefix_new->avail = prefix_old->avail;
 588                 prefix_new->assignments = prefix_old->assignments;
 589                 prefix_old->assignments = NULL;
 590
 591                 // Update all assignments
 592                 struct device_prefix_assignment *assignment;
 593                 struct vlist_tree *assignments = prefix_new->assignments;
 594                 vlist_for_each_element(assignments, assignment, node) {
 595                         assignment->prefix = prefix_new;
 596                         assignments->update(assignments,
 597                                         &assignment->node, &assignment->node);
 598                 }
 599         } else if (node_new) {
 600                 prefix_new->avail = 1ULL << (64 - prefix_new->length);
 601                 prefix_new->assignments = calloc(1, sizeof(*prefix_new->assignments));
 602                 vlist_init(prefix_new->assignments, avl_strcmp,
 603                                 interface_update_prefix_assignments);
 604
 605                 // Create initial assignments for interfaces
 606                 struct interface *iface;
 607                 vlist_for_each_element(&interfaces, iface, node)
 608                         interface_ip_set_prefix_assignment(prefix_new, iface,
 609                                         iface->proto_ip.assignment_length);
 610
 611                 // Set null-route to avoid routing loops
 612                 system_add_route(NULL, &route);
 613         }
 614
 615         if (node_old) {
 616                 // Remove null-route
 617                 system_del_route(NULL, &route);
 618
 619                 list_del(&prefix_old->head);
 620
 621                 if (prefix_old->assignments) {
 622                         vlist_flush_all(prefix_old->assignments);
 623                         free(prefix_old->assignments);
 624                 }
 625                 free(prefix_old);
 626         }
 627
 628         if (node_new)
 629                 list_add(&prefix_new->head, &prefixes);
 630 }
 631
 632 struct device_prefix*
 633 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 634                 uint8_t length, time_t valid_until, time_t preferred_until)
 635 {
 636         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 637         prefix->length = length;
 638         prefix->addr = *addr;
 639         prefix->preferred_until = preferred_until;
 640         prefix->valid_until = valid_until;
 641         prefix->iface = iface;
 642
 643         if (iface)
 644                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 645         else
 646                 interface_update_prefix(NULL, &prefix->node, NULL);
 647
 648         return prefix;
 649 }
 650
 651 void
 652 interface_ip_set_ula_prefix(const char *prefix)
 653 {
 654         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 655         if (prefix)
 656                 strncpy(buf, prefix, sizeof(buf) - 1);
 657         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 658
 659         struct in6_addr addr;
 660         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 661                 if (ula_prefix) {
 662                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 663                         ula_prefix = NULL;
 664                 }
 665                 return;
 666         }
 667
 668         int length;
 669         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 670         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 671                 return;
 672
 673         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 674                         ula_prefix->length != length) {
 675                 if (ula_prefix)
 676                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 677
 678                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length, 0, 0);
 679         }
 680 }
 681
 682 void
 683 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 684 {
 685         struct dns_server *s;
 686
 687         s = calloc(1, sizeof(*s));
 688         if (!s)
 689                 return;
 690
 691         s->af = AF_INET;
 692         if (inet_pton(s->af, str, &s->addr.in))
 693                 goto add;
 694
 695         s->af = AF_INET6;
 696         if (inet_pton(s->af, str, &s->addr.in))
 697                 goto add;
 698
 699         free(s);
 700         return;
 701
 702 add:
 703         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 704           s->af == AF_INET6 ? '6' : '4', str);
 705         vlist_simple_add(&ip->dns_servers, &s->node);
 706 }
 707
 708 void
 709 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 710 {
 711         struct blob_attr *cur;
 712         int rem;
 713
 714         blobmsg_for_each_attr(cur, list, rem) {
 715                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 716                         continue;
 717
 718                 if (!blobmsg_check_attr(cur, NULL))
 719                         continue;
 720
 721                 interface_add_dns_server(ip, blobmsg_data(cur));
 722         }
 723 }
 724
 725 static void
 726 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 727 {
 728         struct dns_search_domain *s;
 729         int len = strlen(str);
 730
 731         s = calloc(1, sizeof(*s) + len + 1);
 732         if (!s)
 733                 return;
 734
 735         D(INTERFACE, "Add DNS search domain: %s\n", str);
 736         memcpy(s->name, str, len);
 737         vlist_simple_add(&ip->dns_search, &s->node);
 738 }
 739
 740 void
 741 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 742 {
 743         struct blob_attr *cur;
 744         int rem;
 745
 746         blobmsg_for_each_attr(cur, list, rem) {
 747                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 748                         continue;
 749
 750                 if (!blobmsg_check_attr(cur, NULL))
 751                         continue;
 752
 753                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 754         }
 755 }
 756
 757 static void
 758 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 759 {
 760         struct dns_server *s;
 761         struct dns_search_domain *d;
 762         const char *str;
 763         char buf[INET6_ADDRSTRLEN];
 764
 765         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 766                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 767                 if (!str)
 768                         continue;
 769
 770                 fprintf(f, "nameserver %s\n", str);
 771         }
 772
 773         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 774                 fprintf(f, "search %s\n", d->name);
 775         }
 776 }
 777
 778 void
 779 interface_write_resolv_conf(void)
 780 {
 781         struct interface *iface;
 782         char *path = alloca(strlen(resolv_conf) + 5);
 783         FILE *f;
 784         uint32_t crcold, crcnew;
 785
 786         sprintf(path, "%s.tmp", resolv_conf);
 787         unlink(path);
 788         f = fopen(path, "w+");
 789         if (!f) {
 790                 D(INTERFACE, "Failed to open %s for writing\n", path);
 791                 return;
 792         }
 793
 794         vlist_for_each_element(&interfaces, iface, node) {
 795                 if (iface->state != IFS_UP)
 796                         continue;
 797
 798                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 799                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 800                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 801                     vlist_simple_empty(&iface->config_ip.dns_servers))
 802                         continue;
 803
 804                 fprintf(f, "# Interface %s\n", iface->name);
 805                 write_resolv_conf_entries(f, &iface->config_ip);
 806                 if (!iface->proto_ip.no_dns)
 807                         write_resolv_conf_entries(f, &iface->proto_ip);
 808         }
 809         fflush(f);
 810         rewind(f);
 811         crcnew = crc32_file(f);
 812         fclose(f);
 813
 814         crcold = crcnew + 1;
 815         f = fopen(resolv_conf, "r");
 816         if (f) {
 817                 crcold = crc32_file(f);
 818                 fclose(f);
 819         }
 820
 821         if (crcold == crcnew) {
 822                 unlink(path);
 823         } else if (rename(path, resolv_conf) < 0) {
 824                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 825                 unlink(path);
 826         }
 827 }
 828
 829 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 830 {
 831         struct device_addr *addr;
 832         struct device_route *route;
 833         struct device *dev;
 834
 835         ip->enabled = enabled;
 836         dev = ip->iface->l3_dev.dev;
 837         if (!dev)
 838                 return;
 839
 840         vlist_for_each_element(&ip->addr, addr, node) {
 841                 if (addr->enabled == enabled)
 842                         continue;
 843
 844                 if (enabled)
 845                         system_add_address(dev, addr);
 846                 else
 847                         system_del_address(dev, addr);
 848                 addr->enabled = enabled;
 849         }
 850
 851         vlist_for_each_element(&ip->route, route, node) {
 852                 bool _enabled = enabled;
 853
 854                 if (!enable_route(ip, route))
 855                         _enabled = false;
 856
 857                 if (route->enabled == _enabled)
 858                         continue;
 859
 860                 if (_enabled) {
 861                         if (!(route->flags & DEVROUTE_METRIC))
 862                                 route->metric = ip->iface->metric;
 863
 864                         system_add_route(dev, route);
 865                 } else
 866                         system_del_route(dev, route);
 867                 route->enabled = _enabled;
 868         }
 869 }
 870
 871 void
 872 interface_ip_update_start(struct interface_ip_settings *ip)
 873 {
 874         if (ip != &ip->iface->config_ip) {
 875                 vlist_simple_update(&ip->dns_servers);
 876                 vlist_simple_update(&ip->dns_search);
 877         }
 878         vlist_update(&ip->route);
 879         vlist_update(&ip->addr);
 880         vlist_update(&ip->prefix);
 881 }
 882
 883 void
 884 interface_ip_update_complete(struct interface_ip_settings *ip)
 885 {
 886         vlist_simple_flush(&ip->dns_servers);
 887         vlist_simple_flush(&ip->dns_search);
 888         vlist_flush(&ip->route);
 889         vlist_flush(&ip->addr);
 890         vlist_flush(&ip->prefix);
 891         interface_write_resolv_conf();
 892 }
 893
 894 void
 895 interface_ip_flush(struct interface_ip_settings *ip)
 896 {
 897         if (ip == &ip->iface->proto_ip)
 898                 vlist_flush_all(&ip->iface->host_routes);
 899         vlist_simple_flush_all(&ip->dns_servers);
 900         vlist_simple_flush_all(&ip->dns_search);
 901         vlist_flush_all(&ip->route);
 902         vlist_flush_all(&ip->addr);
 903         vlist_flush_all(&ip->prefix);
 904 }
 905
 906 static void
 907 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 908 {
 909         ip->iface = iface;
 910         ip->enabled = true;
 911         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 912         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 913         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 914         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 915         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
 916 }
 917
 918 void
 919 interface_ip_init(struct interface *iface)
 920 {
 921         __interface_ip_init(&iface->proto_ip, iface);
 922         __interface_ip_init(&iface->config_ip, iface);
 923         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
 924
 925 }
 926
 927 static void
 928 interface_ip_valid_until_handler(struct uloop_timeout *t)
 929 {
 930         time_t now = system_get_rtime();
 931         struct interface *iface;
 932         vlist_for_each_element(&interfaces, iface, node) {
 933                 if (iface->state != IFS_UP)
 934                         continue;
 935
 936                 struct device_addr *addr, *addrp;
 937                 struct device_route *route, *routep;
 938                 struct device_prefix *pref, *prefp;
 939
 940                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
 941                         if (addr->valid_until && addr->valid_until < now)
 942                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
 943
 944                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
 945                         if (route->valid_until && route->valid_until < now)
 946                                 vlist_delete(&iface->proto_ip.route, &route->node);
 947
 948                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
 949                         if (pref->valid_until && pref->valid_until < now)
 950                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
 951
 952         }
 953
 954         uloop_timeout_set(t, 1000);
 955 }
 956
 957 static void __init
 958 interface_ip_init_worker(void)
 959 {
 960         valid_until_timeout.cb = interface_ip_valid_until_handler;
 961         uloop_timeout_set(&valid_until_timeout, 1000);
 962 }