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 device_prefix_assignment *assignment,
 453                 const struct device_prefix *prefix, struct interface *iface, bool add)
 454 {
 455         const struct interface *uplink = 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 = prefix->addr;
 464         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 465         addr.addr.in6.s6_addr[15] += 1;
 466         addr.mask = assignment->length;
 467         addr.flags = DEVADDR_INET6;
 468         addr.preferred_until = prefix->preferred_until;
 469         addr.valid_until = prefix->valid_until;
 470
 471         if (!add && assignment->enabled) {
 472                 time_t now = system_get_rtime();
 473                 addr.preferred_until = now;
 474                 if (!addr.valid_until || addr.valid_until - now > 7200)
 475                         addr.valid_until = now + 7200;
 476                 system_add_address(l3_downlink, &addr);
 477                 assignment->enabled = false;
 478         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 479                 system_add_address(l3_downlink, &addr);
 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                 assignment->enabled = true;
 487         }
 488 }
 489
 490 static bool interface_prefix_assign(struct list_head *list,
 491                 struct device_prefix_assignment *assign)
 492 {
 493         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 494         struct device_prefix_assignment *c;
 495         list_for_each_entry(c, list, head) {
 496                 if (assign->assigned != -1) {
 497                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 498                                 list_add_tail(&assign->head, &c->head);
 499                                 return true;
 500                         }
 501                 } else if (assign->assigned == -1) {
 502                         current = (current + asize) & (~asize);
 503                         if (current + asize < c->assigned) {
 504                                 assign->assigned = current;
 505                                 list_add_tail(&assign->head, &c->head);
 506                                 return true;
 507                         }
 508                 }
 509                 current = (c->assigned + (1 << (64 - c->length)));
 510         }
 511         return false;
 512 }
 513
 514 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 515 {
 516         struct device_prefix_assignment *c;
 517         struct interface *iface;
 518
 519         // Delete all assignments
 520         while (!list_empty(&prefix->assignments)) {
 521                 c = list_first_entry(&prefix->assignments,
 522                                 struct device_prefix_assignment, head);
 523                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 524                         interface_set_prefix_address(c, prefix, iface, false);
 525                 list_del(&c->head);
 526                 free(c);
 527         }
 528
 529         if (!setup)
 530                 return;
 531
 532         // End-of-assignment sentinel
 533         c = malloc(sizeof(*c) + 1);
 534         c->assigned = 1 << (64 - prefix->length);
 535         c->length = 64;
 536         c->name[0] = 0;
 537         list_add(&c->head, &prefix->assignments);
 538
 539         // Excluded prefix
 540         if (prefix->excl_length > 0) {
 541                 const char name[] = "!excluded";
 542                 c = malloc(sizeof(*c) + sizeof(name));
 543                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 544                                 ((1 << (64 - prefix->length)) - 1);
 545                 c->length = prefix->excl_length;
 546                 memcpy(c->name, name, sizeof(name));
 547                 list_add(&c->head, &prefix->assignments);
 548         }
 549
 550         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 551         vlist_for_each_element(&interfaces, iface, node) {
 552                 if (iface->config_ip.assignment_length < 48 ||
 553                                 iface->config_ip.assignment_length > 64)
 554                         continue;
 555
 556                 size_t namelen = strlen(iface->name) + 1;
 557                 c = malloc(sizeof(*c) + namelen);
 558                 c->length = iface->config_ip.assignment_length;
 559                 c->assigned = iface->config_ip.assignment_hint;
 560                 c->enabled = false;
 561                 memcpy(c->name, iface->name, namelen);
 562
 563                 // First process all custom assignments, put all others in later-list
 564                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 565                         if (c->assigned != -1) {
 566                                 c->assigned = -1;
 567                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 568                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 569                         }
 570                         list_add_tail(&c->head, &assign_later);
 571                 }
 572         }
 573
 574         // Then try to assign all other + failed custom assignments
 575         while (!list_empty(&assign_later)) {
 576                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 577                 list_del(&c->head);
 578                 if (!interface_prefix_assign(&prefix->assignments, c)) {
 579                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 580                                         "of size %hhu for %s\n", c->length, c->name);
 581                         free(c);
 582                 }
 583         }
 584
 585         list_for_each_entry(c, &prefix->assignments, head)
 586                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 587                         interface_set_prefix_address(c, prefix, iface, true);
 588 }
 589
 590
 591 void interface_refresh_assignments(bool hint)
 592 {
 593         static bool refresh = false;
 594         if (!hint && refresh) {
 595                 struct device_prefix *p;
 596                 list_for_each_entry(p, &prefixes, head)
 597                         interface_update_prefix_assignments(p, true);
 598         }
 599         refresh = hint;
 600 }
 601
 602
 603 static void
 604 interface_update_prefix(struct vlist_tree *tree,
 605                              struct vlist_node *node_new,
 606                              struct vlist_node *node_old)
 607 {
 608         struct device_prefix *prefix_old, *prefix_new;
 609         prefix_old = container_of(node_old, struct device_prefix, node);
 610         prefix_new = container_of(node_new, struct device_prefix, node);
 611
 612         struct device_route route;
 613         memset(&route, 0, sizeof(route));
 614         route.flags = DEVADDR_INET6;
 615         route.metric = INT32_MAX;
 616         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 617         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 618
 619         struct device_prefix_assignment *c;
 620         struct interface *iface;
 621
 622         if (node_old && node_new) {
 623                 // Move assignments and refresh addresses to update valid times
 624                 list_splice_init(&prefix_old->assignments, &prefix_new->assignments);
 625
 626                 list_for_each_entry(c, &prefix_new->assignments, head)
 627                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 628                                 interface_set_prefix_address(c, prefix_new, iface, true);
 629         } else if (node_new) {
 630                 // Set null-route to avoid routing loops
 631                 system_add_route(NULL, &route);
 632
 633                 INIT_LIST_HEAD(&prefix_new->assignments);
 634                 interface_update_prefix_assignments(prefix_new, true);
 635         } else if (node_old) {
 636                 interface_update_prefix_assignments(prefix_old, false);
 637
 638                 // Remove null-route
 639                 system_del_route(NULL, &route);
 640         }
 641
 642         if (node_old) {
 643                 list_del(&prefix_old->head);
 644                 free(prefix_old);
 645         }
 646
 647         if (node_new)
 648                 list_add(&prefix_new->head, &prefixes);
 649
 650 }
 651
 652 struct device_prefix*
 653 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 654                 uint8_t length, time_t valid_until, time_t preferred_until,
 655                 struct in6_addr *excl_addr, uint8_t excl_length)
 656 {
 657         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 658         prefix->length = length;
 659         prefix->addr = *addr;
 660         prefix->preferred_until = preferred_until;
 661         prefix->valid_until = valid_until;
 662         prefix->iface = iface;
 663
 664         if (excl_addr) {
 665                 prefix->excl_addr = *excl_addr;
 666                 prefix->excl_length = excl_length;
 667         }
 668
 669         if (iface)
 670                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 671         else
 672                 interface_update_prefix(NULL, &prefix->node, NULL);
 673
 674         return prefix;
 675 }
 676
 677 void
 678 interface_ip_set_ula_prefix(const char *prefix)
 679 {
 680         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 681         if (prefix)
 682                 strncpy(buf, prefix, sizeof(buf) - 1);
 683         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 684
 685         struct in6_addr addr;
 686         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 687                 if (ula_prefix) {
 688                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 689                         ula_prefix = NULL;
 690                 }
 691                 return;
 692         }
 693
 694         int length;
 695         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 696         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 697                 return;
 698
 699         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 700                         ula_prefix->length != length) {
 701                 if (ula_prefix)
 702                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 703
 704                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 705                                 0, 0, NULL, 0);
 706         }
 707 }
 708
 709 void
 710 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 711 {
 712         struct dns_server *s;
 713
 714         s = calloc(1, sizeof(*s));
 715         if (!s)
 716                 return;
 717
 718         s->af = AF_INET;
 719         if (inet_pton(s->af, str, &s->addr.in))
 720                 goto add;
 721
 722         s->af = AF_INET6;
 723         if (inet_pton(s->af, str, &s->addr.in))
 724                 goto add;
 725
 726         free(s);
 727         return;
 728
 729 add:
 730         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 731           s->af == AF_INET6 ? '6' : '4', str);
 732         vlist_simple_add(&ip->dns_servers, &s->node);
 733 }
 734
 735 void
 736 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 737 {
 738         struct blob_attr *cur;
 739         int rem;
 740
 741         blobmsg_for_each_attr(cur, list, rem) {
 742                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 743                         continue;
 744
 745                 if (!blobmsg_check_attr(cur, NULL))
 746                         continue;
 747
 748                 interface_add_dns_server(ip, blobmsg_data(cur));
 749         }
 750 }
 751
 752 static void
 753 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 754 {
 755         struct dns_search_domain *s;
 756         int len = strlen(str);
 757
 758         s = calloc(1, sizeof(*s) + len + 1);
 759         if (!s)
 760                 return;
 761
 762         D(INTERFACE, "Add DNS search domain: %s\n", str);
 763         memcpy(s->name, str, len);
 764         vlist_simple_add(&ip->dns_search, &s->node);
 765 }
 766
 767 void
 768 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 769 {
 770         struct blob_attr *cur;
 771         int rem;
 772
 773         blobmsg_for_each_attr(cur, list, rem) {
 774                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 775                         continue;
 776
 777                 if (!blobmsg_check_attr(cur, NULL))
 778                         continue;
 779
 780                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 781         }
 782 }
 783
 784 static void
 785 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 786 {
 787         struct dns_server *s;
 788         struct dns_search_domain *d;
 789         const char *str;
 790         char buf[INET6_ADDRSTRLEN];
 791
 792         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 793                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 794                 if (!str)
 795                         continue;
 796
 797                 fprintf(f, "nameserver %s\n", str);
 798         }
 799
 800         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 801                 fprintf(f, "search %s\n", d->name);
 802         }
 803 }
 804
 805 void
 806 interface_write_resolv_conf(void)
 807 {
 808         struct interface *iface;
 809         char *path = alloca(strlen(resolv_conf) + 5);
 810         FILE *f;
 811         uint32_t crcold, crcnew;
 812
 813         sprintf(path, "%s.tmp", resolv_conf);
 814         unlink(path);
 815         f = fopen(path, "w+");
 816         if (!f) {
 817                 D(INTERFACE, "Failed to open %s for writing\n", path);
 818                 return;
 819         }
 820
 821         vlist_for_each_element(&interfaces, iface, node) {
 822                 if (iface->state != IFS_UP)
 823                         continue;
 824
 825                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 826                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 827                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 828                     vlist_simple_empty(&iface->config_ip.dns_servers))
 829                         continue;
 830
 831                 fprintf(f, "# Interface %s\n", iface->name);
 832                 write_resolv_conf_entries(f, &iface->config_ip);
 833                 if (!iface->proto_ip.no_dns)
 834                         write_resolv_conf_entries(f, &iface->proto_ip);
 835         }
 836         fflush(f);
 837         rewind(f);
 838         crcnew = crc32_file(f);
 839         fclose(f);
 840
 841         crcold = crcnew + 1;
 842         f = fopen(resolv_conf, "r");
 843         if (f) {
 844                 crcold = crc32_file(f);
 845                 fclose(f);
 846         }
 847
 848         if (crcold == crcnew) {
 849                 unlink(path);
 850         } else if (rename(path, resolv_conf) < 0) {
 851                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 852                 unlink(path);
 853         }
 854 }
 855
 856 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 857 {
 858         struct device_addr *addr;
 859         struct device_route *route;
 860         struct device *dev;
 861
 862         ip->enabled = enabled;
 863         dev = ip->iface->l3_dev.dev;
 864         if (!dev)
 865                 return;
 866
 867         vlist_for_each_element(&ip->addr, addr, node) {
 868                 if (addr->enabled == enabled)
 869                         continue;
 870
 871                 if (enabled)
 872                         system_add_address(dev, addr);
 873                 else
 874                         system_del_address(dev, addr);
 875                 addr->enabled = enabled;
 876         }
 877
 878         vlist_for_each_element(&ip->route, route, node) {
 879                 bool _enabled = enabled;
 880
 881                 if (!enable_route(ip, route))
 882                         _enabled = false;
 883
 884                 if (route->enabled == _enabled)
 885                         continue;
 886
 887                 if (_enabled) {
 888                         if (!(route->flags & DEVROUTE_METRIC))
 889                                 route->metric = ip->iface->metric;
 890
 891                         system_add_route(dev, route);
 892                 } else
 893                         system_del_route(dev, route);
 894                 route->enabled = _enabled;
 895         }
 896
 897         struct device_prefix *c;
 898         struct device_prefix_assignment *a;
 899         list_for_each_entry(c, &prefixes, head)
 900                 list_for_each_entry(a, &c->assignments, head)
 901                         if (!strcmp(a->name, ip->iface->name))
 902                                 interface_set_prefix_address(a, c, ip->iface, enabled);
 903 }
 904
 905 void
 906 interface_ip_update_start(struct interface_ip_settings *ip)
 907 {
 908         if (ip != &ip->iface->config_ip) {
 909                 vlist_simple_update(&ip->dns_servers);
 910                 vlist_simple_update(&ip->dns_search);
 911         }
 912         vlist_update(&ip->route);
 913         vlist_update(&ip->addr);
 914         vlist_update(&ip->prefix);
 915 }
 916
 917 void
 918 interface_ip_update_complete(struct interface_ip_settings *ip)
 919 {
 920         vlist_simple_flush(&ip->dns_servers);
 921         vlist_simple_flush(&ip->dns_search);
 922         vlist_flush(&ip->route);
 923         vlist_flush(&ip->addr);
 924         vlist_flush(&ip->prefix);
 925         interface_write_resolv_conf();
 926 }
 927
 928 void
 929 interface_ip_flush(struct interface_ip_settings *ip)
 930 {
 931         if (ip == &ip->iface->proto_ip)
 932                 vlist_flush_all(&ip->iface->host_routes);
 933         vlist_simple_flush_all(&ip->dns_servers);
 934         vlist_simple_flush_all(&ip->dns_search);
 935         vlist_flush_all(&ip->route);
 936         vlist_flush_all(&ip->addr);
 937         vlist_flush_all(&ip->prefix);
 938 }
 939
 940 static void
 941 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 942 {
 943         ip->iface = iface;
 944         ip->enabled = true;
 945         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 946         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 947         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 948         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 949         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
 950 }
 951
 952 void
 953 interface_ip_init(struct interface *iface)
 954 {
 955         __interface_ip_init(&iface->proto_ip, iface);
 956         __interface_ip_init(&iface->config_ip, iface);
 957         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
 958
 959 }
 960
 961 static void
 962 interface_ip_valid_until_handler(struct uloop_timeout *t)
 963 {
 964         time_t now = system_get_rtime();
 965         struct interface *iface;
 966         vlist_for_each_element(&interfaces, iface, node) {
 967                 if (iface->state != IFS_UP)
 968                         continue;
 969
 970                 struct device_addr *addr, *addrp;
 971                 struct device_route *route, *routep;
 972                 struct device_prefix *pref, *prefp;
 973
 974                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
 975                         if (addr->valid_until && addr->valid_until < now)
 976                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
 977
 978                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
 979                         if (route->valid_until && route->valid_until < now)
 980                                 vlist_delete(&iface->proto_ip.route, &route->node);
 981
 982                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
 983                         if (pref->valid_until && pref->valid_until < now)
 984                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
 985
 986         }
 987
 988         uloop_timeout_set(t, 1000);
 989 }
 990
 991 static void __init
 992 interface_ip_init_worker(void)
 993 {
 994         valid_until_timeout.cb = interface_ip_valid_until_handler;
 995         uloop_timeout_set(&valid_until_timeout, 1000);
 996 }