interface-ip.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2012 Steven Barth <steven@midlink.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19
  20 #include <arpa/inet.h>
  21
  22 #include "netifd.h"
  23 #include "device.h"
  24 #include "interface.h"
  25 #include "interface-ip.h"
  26 #include "proto.h"
  27 #include "ubus.h"
  28 #include "system.h"
  29
  30 enum {
  31         ROUTE_INTERFACE,
  32         ROUTE_TARGET,
  33         ROUTE_MASK,
  34         ROUTE_GATEWAY,
  35         ROUTE_METRIC,
  36         ROUTE_MTU,
  37         ROUTE_VALID,
  38         ROUTE_TABLE,
  39         __ROUTE_MAX
  40 };
  41
  42 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  43         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  44         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  45         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  46         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  47         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  48         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  49         [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
  50         [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  51 };
  52
  53 const struct config_param_list route_attr_list = {
  54         .n_params = __ROUTE_MAX,
  55         .params = route_attr,
  56 };
  57
  58
  59 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  60 static struct device_prefix *ula_prefix = NULL;
  61 static struct uloop_timeout valid_until_timeout;
  62
  63
  64 static void
  65 clear_if_addr(union if_addr *a, int mask)
  66 {
  67         int m_bytes = (mask + 7) / 8;
  68         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  69         uint8_t *p = (uint8_t *) a;
  70
  71         if (m_bytes < sizeof(a))
  72                 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
  73
  74         p[m_bytes - 1] &= ~m_clear;
  75 }
  76
  77 static bool
  78 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  79 {
  80         union if_addr *p1, *p2;
  81
  82         p1 = alloca(sizeof(*a1));
  83         p2 = alloca(sizeof(*a2));
  84
  85         memcpy(p1, a1, sizeof(*a1));
  86         clear_if_addr(p1, mask);
  87         memcpy(p2, a2, sizeof(*a2));
  88         clear_if_addr(p2, mask);
  89
  90         return !memcmp(p1, p2, sizeof(*p1));
  91 }
  92
  93 static bool
  94 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
  95 {
  96         struct device_addr *addr;
  97
  98         vlist_for_each_element(&ip->addr, addr, node) {
  99                 if (!addr->enabled)
 100                         continue;
 101
 102                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 103                         continue;
 104
 105                 if (!match_if_addr(&addr->addr, a, addr->mask))
 106                         continue;
 107
 108                 return true;
 109         }
 110
 111         return false;
 112 }
 113
 114 static void
 115 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 116                        bool v6, struct device_route **res)
 117 {
 118         struct device_route *route;
 119
 120         vlist_for_each_element(&ip->route, route, node) {
 121                 if (!route->enabled)
 122                         continue;
 123
 124                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 125                         continue;
 126
 127                 if (!match_if_addr(&route->addr, a, route->mask))
 128                         continue;
 129
 130                 if (route->flags & DEVROUTE_TABLE)
 131                         continue;
 132
 133                 if (!*res || route->mask < (*res)->mask)
 134                         *res = route;
 135         }
 136 }
 137
 138 static bool
 139 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 140 {
 141         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 142                __find_ip_addr_target(&iface->config_ip, a, v6);
 143 }
 144
 145 static void
 146 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 147                                bool v6, struct device_route **route)
 148 {
 149         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 150         __find_ip_route_target(&iface->config_ip, a, v6, route);
 151 }
 152
 153 struct interface *
 154 interface_ip_add_target_route(union if_addr *addr, bool v6)
 155 {
 156         struct interface *iface;
 157         struct device_route *route, *r_next = NULL;
 158         bool defaultroute_target = false;
 159         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 160
 161         route = calloc(1, sizeof(*route));
 162         if (!route)
 163                 return NULL;
 164
 165         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 166         route->mask = v6 ? 128 : 32;
 167         if (memcmp(&route->addr, addr, addrsize) == 0)
 168                 defaultroute_target = true;
 169         else
 170                 memcpy(&route->addr, addr, addrsize);
 171
 172         vlist_for_each_element(&interfaces, iface, node) {
 173                 /* look for locally addressable target first */
 174                 if (interface_ip_find_addr_target(iface, addr, v6))
 175                         goto done;
 176
 177                 /* do not stop at the first route, let the lookup compare
 178                  * masks to find the best match */
 179                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 180         }
 181
 182         if (!r_next) {
 183                 free(route);
 184                 return NULL;
 185         }
 186
 187         iface = r_next->iface;
 188         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 189         route->mtu = r_next->mtu;
 190         route->metric = r_next->metric;
 191
 192 done:
 193         route->iface = iface;
 194         if (defaultroute_target)
 195                 free(route);
 196         else
 197                 vlist_add(&iface->host_routes, &route->node, route);
 198         return iface;
 199 }
 200
 201 void
 202 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 203 {
 204         struct interface_ip_settings *ip;
 205         struct blob_attr *tb[__ROUTE_MAX], *cur;
 206         struct device_route *route;
 207         int af = v6 ? AF_INET6 : AF_INET;
 208
 209         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 210
 211         if (!iface) {
 212                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 213                         return;
 214
 215                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 216                 if (!iface)
 217                         return;
 218
 219                 ip = &iface->config_ip;
 220         } else {
 221                 ip = &iface->proto_ip;
 222         }
 223
 224         route = calloc(1, sizeof(*route));
 225         if (!route)
 226                 return;
 227
 228         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 229         route->mask = v6 ? 128 : 32;
 230         if ((cur = tb[ROUTE_MASK]) != NULL) {
 231                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 232                 if (route->mask > (v6 ? 128 : 32))
 233                         goto error;
 234         }
 235
 236         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 237                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 238                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 239                         goto error;
 240                 }
 241         }
 242
 243         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 244                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 245                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 246                         goto error;
 247                 }
 248         }
 249
 250         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 251                 route->metric = blobmsg_get_u32(cur);
 252                 route->flags |= DEVROUTE_METRIC;
 253         }
 254
 255         if ((cur = tb[ROUTE_MTU]) != NULL) {
 256                 route->mtu = blobmsg_get_u32(cur);
 257                 route->flags |= DEVROUTE_MTU;
 258         }
 259
 260         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 261                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 262                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 263                         goto error;
 264                 }
 265
 266                 if (route->table)
 267                         route->flags |= DEVROUTE_TABLE;
 268         }
 269
 270         if ((cur = tb[ROUTE_VALID]) != NULL)
 271                 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
 272
 273         vlist_add(&ip->route, &route->node, route);
 274         return;
 275
 276 error:
 277         free(route);
 278 }
 279
 280 static int
 281 addr_cmp(const void *k1, const void *k2, void *ptr)
 282 {
 283         return memcmp(k1, k2, sizeof(struct device_addr) -
 284                       offsetof(struct device_addr, flags));
 285 }
 286
 287 static int
 288 route_cmp(const void *k1, const void *k2, void *ptr)
 289 {
 290         const struct device_route *r1 = k1, *r2 = k2;
 291
 292         if (r1->mask != r2->mask);
 293                 return r2->mask - r1->mask;
 294
 295         if (r1->metric != r2->metric);
 296                 return r1->metric - r2->metric;
 297
 298         if (r1->flags != r2->flags)
 299                 return r2->flags - r1->flags;
 300
 301         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 302 }
 303
 304 static int
 305 prefix_cmp(const void *k1, const void *k2, void *ptr)
 306 {
 307         return memcmp(k1, k2, sizeof(struct device_prefix) -
 308                         offsetof(struct device_prefix, addr));
 309 }
 310
 311 static void
 312 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 313 {
 314         struct device *dev = iface->l3_dev.dev;
 315         struct device_route route;
 316
 317         memset(&route, 0, sizeof(route));
 318         route.iface = iface;
 319         route.flags = addr->flags;
 320         route.mask = addr->mask;
 321         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 322         clear_if_addr(&route.addr, route.mask);
 323
 324         if (add) {
 325                 route.flags |= DEVADDR_KERNEL;
 326                 system_del_route(dev, &route);
 327
 328                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 329                         route.flags &= ~DEVADDR_KERNEL;
 330                         route.metric = iface->metric;
 331                         system_add_route(dev, &route);
 332                 }
 333         } else {
 334                 if (!(addr->flags & DEVADDR_OFFLINK))
 335                         system_del_route(dev, &route);
 336         }
 337 }
 338
 339 static void
 340 interface_update_proto_addr(struct vlist_tree *tree,
 341                             struct vlist_node *node_new,
 342                             struct vlist_node *node_old)
 343 {
 344         struct interface_ip_settings *ip;
 345         struct interface *iface;
 346         struct device *dev;
 347         struct device_addr *a_new = NULL, *a_old = NULL;
 348         bool keep = false;
 349
 350         ip = container_of(tree, struct interface_ip_settings, addr);
 351         iface = ip->iface;
 352         dev = iface->l3_dev.dev;
 353
 354         if (node_new) {
 355                 a_new = container_of(node_new, struct device_addr, node);
 356
 357                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 358                     !a_new->broadcast) {
 359
 360                         uint32_t mask = ~0;
 361                         uint32_t *a = (uint32_t *) &a_new->addr;
 362
 363                         mask >>= a_new->mask;
 364                         a_new->broadcast = *a | htonl(mask);
 365                 }
 366         }
 367
 368         if (node_old)
 369                 a_old = container_of(node_old, struct device_addr, node);
 370
 371         if (a_new && a_old) {
 372                 keep = true;
 373
 374                 if (a_old->flags != a_new->flags ||
 375                                 a_old->valid_until != a_new->valid_until ||
 376                                 a_old->preferred_until != a_new->preferred_until)
 377                         keep = false;
 378
 379                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 380                     a_new->broadcast != a_old->broadcast)
 381                         keep = false;
 382         }
 383
 384         if (node_old) {
 385                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 386                         interface_handle_subnet_route(iface, a_old, false);
 387                         system_del_address(dev, a_old);
 388                 }
 389                 free(a_old);
 390         }
 391
 392         if (node_new) {
 393                 a_new->enabled = true;
 394                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 395                         system_add_address(dev, a_new);
 396                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 397                                 interface_handle_subnet_route(iface, a_new, true);
 398                 }
 399         }
 400 }
 401
 402 static bool
 403 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 404 {
 405         if (ip->no_defaultroute && !route->mask)
 406                 return false;
 407
 408         return ip->enabled;
 409 }
 410
 411 static void
 412 interface_update_proto_route(struct vlist_tree *tree,
 413                              struct vlist_node *node_new,
 414                              struct vlist_node *node_old)
 415 {
 416         struct interface_ip_settings *ip;
 417         struct interface *iface;
 418         struct device *dev;
 419         struct device_route *route_old, *route_new;
 420         bool keep = false;
 421
 422         ip = container_of(tree, struct interface_ip_settings, route);
 423         iface = ip->iface;
 424         dev = iface->l3_dev.dev;
 425
 426         route_old = container_of(node_old, struct device_route, node);
 427         route_new = container_of(node_new, struct device_route, node);
 428
 429         if (node_old && node_new)
 430                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 431
 432         if (node_old) {
 433                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 434                         system_del_route(dev, route_old);
 435                 free(route_old);
 436         }
 437
 438         if (node_new) {
 439                 bool _enabled = enable_route(ip, route_new);
 440
 441                 if (!(route_new->flags & DEVROUTE_METRIC))
 442                         route_new->metric = iface->metric;
 443
 444                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 445                         system_add_route(dev, route_new);
 446
 447                 route_new->iface = iface;
 448                 route_new->enabled = _enabled;
 449         }
 450 }
 451
 452 static void
 453 interface_update_host_route(struct vlist_tree *tree,
 454                              struct vlist_node *node_new,
 455                              struct vlist_node *node_old)
 456 {
 457         struct interface *iface;
 458         struct device *dev;
 459         struct device_route *route_old, *route_new;
 460
 461         iface = container_of(tree, struct interface, host_routes);
 462         dev = iface->l3_dev.dev;
 463
 464         route_old = container_of(node_old, struct device_route, node);
 465         route_new = container_of(node_new, struct device_route, node);
 466
 467         if (node_old) {
 468                 system_del_route(dev, route_old);
 469                 free(route_old);
 470         }
 471
 472         if (node_new)
 473                 system_add_route(dev, route_new);
 474 }
 475
 476
 477 static void
 478 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 479                 const struct device_prefix *prefix, struct interface *iface, bool add)
 480 {
 481         const struct interface *uplink = prefix->iface;
 482         if (!iface->l3_dev.dev)
 483                 return;
 484
 485         struct device *l3_downlink = iface->l3_dev.dev;
 486
 487         struct device_addr addr;
 488         memset(&addr, 0, sizeof(addr));
 489         addr.addr.in6 = prefix->addr;
 490         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 491         addr.addr.in6.s6_addr[15] += 1;
 492         addr.mask = assignment->length;
 493         addr.flags = DEVADDR_INET6;
 494         addr.preferred_until = prefix->preferred_until;
 495         addr.valid_until = prefix->valid_until;
 496
 497         if (!add && assignment->enabled) {
 498                 time_t now = system_get_rtime();
 499                 addr.preferred_until = now;
 500                 if (!addr.valid_until || addr.valid_until - now > 7200)
 501                         addr.valid_until = now + 7200;
 502                 system_add_address(l3_downlink, &addr);
 503                 assignment->enabled = false;
 504         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 505                 system_add_address(l3_downlink, &addr);
 506                 if (uplink && uplink->l3_dev.dev) {
 507                         int mtu = system_update_ipv6_mtu(
 508                                         uplink->l3_dev.dev, 0);
 509                         if (mtu > 0)
 510                                 system_update_ipv6_mtu(l3_downlink, mtu);
 511                 }
 512                 assignment->enabled = true;
 513         }
 514 }
 515
 516 static bool interface_prefix_assign(struct list_head *list,
 517                 struct device_prefix_assignment *assign)
 518 {
 519         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 520         struct device_prefix_assignment *c;
 521         list_for_each_entry(c, list, head) {
 522                 if (assign->assigned != -1) {
 523                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 524                                 list_add_tail(&assign->head, &c->head);
 525                                 return true;
 526                         }
 527                 } else if (assign->assigned == -1) {
 528                         current = (current + asize) & (~asize);
 529                         if (current + asize < c->assigned) {
 530                                 assign->assigned = current;
 531                                 list_add_tail(&assign->head, &c->head);
 532                                 return true;
 533                         }
 534                 }
 535                 current = (c->assigned + (1 << (64 - c->length)));
 536         }
 537         return false;
 538 }
 539
 540 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 541 {
 542         struct device_prefix_assignment *c;
 543         struct interface *iface;
 544
 545         // Delete all assignments
 546         while (!list_empty(&prefix->assignments)) {
 547                 c = list_first_entry(&prefix->assignments,
 548                                 struct device_prefix_assignment, head);
 549                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 550                         interface_set_prefix_address(c, prefix, iface, false);
 551                 list_del(&c->head);
 552                 free(c);
 553         }
 554
 555         if (!setup)
 556                 return;
 557
 558         // End-of-assignment sentinel
 559         c = malloc(sizeof(*c) + 1);
 560         c->assigned = 1 << (64 - prefix->length);
 561         c->length = 64;
 562         c->name[0] = 0;
 563         list_add(&c->head, &prefix->assignments);
 564
 565         // Excluded prefix
 566         if (prefix->excl_length > 0) {
 567                 const char name[] = "!excluded";
 568                 c = malloc(sizeof(*c) + sizeof(name));
 569                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 570                                 ((1 << (64 - prefix->length)) - 1);
 571                 c->length = prefix->excl_length;
 572                 memcpy(c->name, name, sizeof(name));
 573                 list_add(&c->head, &prefix->assignments);
 574         }
 575
 576         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 577         vlist_for_each_element(&interfaces, iface, node) {
 578                 if (iface->config_ip.assignment_length < 48 ||
 579                                 iface->config_ip.assignment_length > 64)
 580                         continue;
 581
 582                 size_t namelen = strlen(iface->name) + 1;
 583                 c = malloc(sizeof(*c) + namelen);
 584                 c->length = iface->config_ip.assignment_length;
 585                 c->assigned = iface->config_ip.assignment_hint;
 586                 c->enabled = false;
 587                 memcpy(c->name, iface->name, namelen);
 588
 589                 // First process all custom assignments, put all others in later-list
 590                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 591                         if (c->assigned != -1) {
 592                                 c->assigned = -1;
 593                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 594                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 595                         }
 596                         list_add_tail(&c->head, &assign_later);
 597                 }
 598         }
 599
 600         // Then try to assign all other + failed custom assignments
 601         while (!list_empty(&assign_later)) {
 602                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 603                 list_del(&c->head);
 604                 if (!interface_prefix_assign(&prefix->assignments, c)) {
 605                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 606                                         "of size %hhu for %s\n", c->length, c->name);
 607                         free(c);
 608                 }
 609         }
 610
 611         list_for_each_entry(c, &prefix->assignments, head)
 612                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 613                         interface_set_prefix_address(c, prefix, iface, true);
 614 }
 615
 616
 617 void interface_refresh_assignments(bool hint)
 618 {
 619         static bool refresh = false;
 620         if (!hint && refresh) {
 621                 struct device_prefix *p;
 622                 list_for_each_entry(p, &prefixes, head)
 623                         interface_update_prefix_assignments(p, true);
 624         }
 625         refresh = hint;
 626 }
 627
 628
 629 static void
 630 interface_update_prefix(struct vlist_tree *tree,
 631                              struct vlist_node *node_new,
 632                              struct vlist_node *node_old)
 633 {
 634         struct device_prefix *prefix_old, *prefix_new;
 635         prefix_old = container_of(node_old, struct device_prefix, node);
 636         prefix_new = container_of(node_new, struct device_prefix, node);
 637
 638         struct device_route route;
 639         memset(&route, 0, sizeof(route));
 640         route.flags = DEVADDR_INET6;
 641         route.metric = INT32_MAX;
 642         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 643         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 644
 645         struct device_prefix_assignment *c;
 646         struct interface *iface;
 647
 648         if (node_old && node_new) {
 649                 // Move assignments and refresh addresses to update valid times
 650                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 651
 652                 list_for_each_entry(c, &prefix_new->assignments, head)
 653                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 654                                 interface_set_prefix_address(c, prefix_new, iface, true);
 655         } else if (node_new) {
 656                 // Set null-route to avoid routing loops
 657                 system_add_route(NULL, &route);
 658
 659                 interface_update_prefix_assignments(prefix_new, true);
 660         } else if (node_old) {
 661                 interface_update_prefix_assignments(prefix_old, false);
 662
 663                 // Remove null-route
 664                 system_del_route(NULL, &route);
 665         }
 666
 667         if (node_old) {
 668                 list_del(&prefix_old->head);
 669                 free(prefix_old);
 670         }
 671
 672         if (node_new)
 673                 list_add(&prefix_new->head, &prefixes);
 674
 675 }
 676
 677 struct device_prefix*
 678 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 679                 uint8_t length, time_t valid_until, time_t preferred_until,
 680                 struct in6_addr *excl_addr, uint8_t excl_length)
 681 {
 682         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 683         prefix->length = length;
 684         prefix->addr = *addr;
 685         prefix->preferred_until = preferred_until;
 686         prefix->valid_until = valid_until;
 687         prefix->iface = iface;
 688         INIT_LIST_HEAD(&prefix->assignments);
 689
 690         if (excl_addr) {
 691                 prefix->excl_addr = *excl_addr;
 692                 prefix->excl_length = excl_length;
 693         }
 694
 695         if (iface)
 696                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 697         else
 698                 interface_update_prefix(NULL, &prefix->node, NULL);
 699
 700         return prefix;
 701 }
 702
 703 void
 704 interface_ip_set_ula_prefix(const char *prefix)
 705 {
 706         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 707         if (prefix)
 708                 strncpy(buf, prefix, sizeof(buf) - 1);
 709         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 710
 711         struct in6_addr addr;
 712         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 713                 if (ula_prefix) {
 714                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 715                         ula_prefix = NULL;
 716                 }
 717                 return;
 718         }
 719
 720         int length;
 721         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 722         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 723                 return;
 724
 725         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 726                         ula_prefix->length != length) {
 727                 if (ula_prefix)
 728                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 729
 730                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 731                                 0, 0, NULL, 0);
 732         }
 733 }
 734
 735 void
 736 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 737 {
 738         struct dns_server *s;
 739
 740         s = calloc(1, sizeof(*s));
 741         if (!s)
 742                 return;
 743
 744         s->af = AF_INET;
 745         if (inet_pton(s->af, str, &s->addr.in))
 746                 goto add;
 747
 748         s->af = AF_INET6;
 749         if (inet_pton(s->af, str, &s->addr.in))
 750                 goto add;
 751
 752         free(s);
 753         return;
 754
 755 add:
 756         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 757           s->af == AF_INET6 ? '6' : '4', str);
 758         vlist_simple_add(&ip->dns_servers, &s->node);
 759 }
 760
 761 void
 762 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 763 {
 764         struct blob_attr *cur;
 765         int rem;
 766
 767         blobmsg_for_each_attr(cur, list, rem) {
 768                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 769                         continue;
 770
 771                 if (!blobmsg_check_attr(cur, NULL))
 772                         continue;
 773
 774                 interface_add_dns_server(ip, blobmsg_data(cur));
 775         }
 776 }
 777
 778 static void
 779 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 780 {
 781         struct dns_search_domain *s;
 782         int len = strlen(str);
 783
 784         s = calloc(1, sizeof(*s) + len + 1);
 785         if (!s)
 786                 return;
 787
 788         D(INTERFACE, "Add DNS search domain: %s\n", str);
 789         memcpy(s->name, str, len);
 790         vlist_simple_add(&ip->dns_search, &s->node);
 791 }
 792
 793 void
 794 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 795 {
 796         struct blob_attr *cur;
 797         int rem;
 798
 799         blobmsg_for_each_attr(cur, list, rem) {
 800                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 801                         continue;
 802
 803                 if (!blobmsg_check_attr(cur, NULL))
 804                         continue;
 805
 806                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 807         }
 808 }
 809
 810 static void
 811 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 812 {
 813         struct dns_server *s;
 814         struct dns_search_domain *d;
 815         const char *str;
 816         char buf[INET6_ADDRSTRLEN];
 817
 818         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 819                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 820                 if (!str)
 821                         continue;
 822
 823                 fprintf(f, "nameserver %s\n", str);
 824         }
 825
 826         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 827                 fprintf(f, "search %s\n", d->name);
 828         }
 829 }
 830
 831 void
 832 interface_write_resolv_conf(void)
 833 {
 834         struct interface *iface;
 835         char *path = alloca(strlen(resolv_conf) + 5);
 836         FILE *f;
 837         uint32_t crcold, crcnew;
 838
 839         sprintf(path, "%s.tmp", resolv_conf);
 840         unlink(path);
 841         f = fopen(path, "w+");
 842         if (!f) {
 843                 D(INTERFACE, "Failed to open %s for writing\n", path);
 844                 return;
 845         }
 846
 847         vlist_for_each_element(&interfaces, iface, node) {
 848                 if (iface->state != IFS_UP)
 849                         continue;
 850
 851                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 852                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 853                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 854                     vlist_simple_empty(&iface->config_ip.dns_servers))
 855                         continue;
 856
 857                 fprintf(f, "# Interface %s\n", iface->name);
 858                 write_resolv_conf_entries(f, &iface->config_ip);
 859                 if (!iface->proto_ip.no_dns)
 860                         write_resolv_conf_entries(f, &iface->proto_ip);
 861         }
 862         fflush(f);
 863         rewind(f);
 864         crcnew = crc32_file(f);
 865         fclose(f);
 866
 867         crcold = crcnew + 1;
 868         f = fopen(resolv_conf, "r");
 869         if (f) {
 870                 crcold = crc32_file(f);
 871                 fclose(f);
 872         }
 873
 874         if (crcold == crcnew) {
 875                 unlink(path);
 876         } else if (rename(path, resolv_conf) < 0) {
 877                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 878                 unlink(path);
 879         }
 880 }
 881
 882 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 883 {
 884         struct device_addr *addr;
 885         struct device_route *route;
 886         struct device *dev;
 887
 888         ip->enabled = enabled;
 889         dev = ip->iface->l3_dev.dev;
 890         if (!dev)
 891                 return;
 892
 893         vlist_for_each_element(&ip->addr, addr, node) {
 894                 if (addr->enabled == enabled)
 895                         continue;
 896
 897                 if (enabled)
 898                         system_add_address(dev, addr);
 899                 else
 900                         system_del_address(dev, addr);
 901                 addr->enabled = enabled;
 902         }
 903
 904         vlist_for_each_element(&ip->route, route, node) {
 905                 bool _enabled = enabled;
 906
 907                 if (!enable_route(ip, route))
 908                         _enabled = false;
 909
 910                 if (route->enabled == _enabled)
 911                         continue;
 912
 913                 if (_enabled) {
 914                         if (!(route->flags & DEVROUTE_METRIC))
 915                                 route->metric = ip->iface->metric;
 916
 917                         system_add_route(dev, route);
 918                 } else
 919                         system_del_route(dev, route);
 920                 route->enabled = _enabled;
 921         }
 922
 923         struct device_prefix *c;
 924         struct device_prefix_assignment *a;
 925         list_for_each_entry(c, &prefixes, head)
 926                 list_for_each_entry(a, &c->assignments, head)
 927                         if (!strcmp(a->name, ip->iface->name))
 928                                 interface_set_prefix_address(a, c, ip->iface, enabled);
 929 }
 930
 931 void
 932 interface_ip_update_start(struct interface_ip_settings *ip)
 933 {
 934         if (ip != &ip->iface->config_ip) {
 935                 vlist_simple_update(&ip->dns_servers);
 936                 vlist_simple_update(&ip->dns_search);
 937         }
 938         vlist_update(&ip->route);
 939         vlist_update(&ip->addr);
 940         vlist_update(&ip->prefix);
 941 }
 942
 943 void
 944 interface_ip_update_complete(struct interface_ip_settings *ip)
 945 {
 946         vlist_simple_flush(&ip->dns_servers);
 947         vlist_simple_flush(&ip->dns_search);
 948         vlist_flush(&ip->route);
 949         vlist_flush(&ip->addr);
 950         vlist_flush(&ip->prefix);
 951         interface_write_resolv_conf();
 952 }
 953
 954 void
 955 interface_ip_flush(struct interface_ip_settings *ip)
 956 {
 957         if (ip == &ip->iface->proto_ip)
 958                 vlist_flush_all(&ip->iface->host_routes);
 959         vlist_simple_flush_all(&ip->dns_servers);
 960         vlist_simple_flush_all(&ip->dns_search);
 961         vlist_flush_all(&ip->route);
 962         vlist_flush_all(&ip->addr);
 963         vlist_flush_all(&ip->prefix);
 964 }
 965
 966 static void
 967 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 968 {
 969         ip->iface = iface;
 970         ip->enabled = true;
 971         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 972         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 973         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 974         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 975         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
 976 }
 977
 978 void
 979 interface_ip_init(struct interface *iface)
 980 {
 981         __interface_ip_init(&iface->proto_ip, iface);
 982         __interface_ip_init(&iface->config_ip, iface);
 983         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
 984
 985 }
 986
 987 static void
 988 interface_ip_valid_until_handler(struct uloop_timeout *t)
 989 {
 990         time_t now = system_get_rtime();
 991         struct interface *iface;
 992         vlist_for_each_element(&interfaces, iface, node) {
 993                 if (iface->state != IFS_UP)
 994                         continue;
 995
 996                 struct device_addr *addr, *addrp;
 997                 struct device_route *route, *routep;
 998                 struct device_prefix *pref, *prefp;
 999
1000                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1001                         if (addr->valid_until && addr->valid_until < now)
1002                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1003
1004                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1005                         if (route->valid_until && route->valid_until < now)
1006                                 vlist_delete(&iface->proto_ip.route, &route->node);
1007
1008                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1009                         if (pref->valid_until && pref->valid_until < now)
1010                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1011
1012         }
1013
1014         uloop_timeout_set(t, 1000);
1015 }
1016
1017 static void __init
1018 interface_ip_init_worker(void)
1019 {
1020         valid_until_timeout.cb = interface_ip_valid_until_handler;
1021         uloop_timeout_set(&valid_until_timeout, 1000);
1022 }