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 static void interface_trigger_ula_prefix(struct interface *iface,
 482                 const struct device_prefix *prefix, bool enable)
 483 {
 484         if (prefix == ula_prefix || (prefix->addr.s6_addr[0] & 0xfe) != 0xfc)
 485                 return;
 486
 487         bool external_ula = false;
 488         struct device_prefix_assignment *ula_assign = NULL;
 489         struct device_prefix *c;
 490         list_for_each_entry(c, &prefixes, head) {
 491                 if (c != ula_prefix && (c->addr.s6_addr[0] & 0xfe) != 0xfc)
 492                         continue;
 493
 494                 struct device_prefix_assignment *a;
 495                 list_for_each_entry(a, &c->assignments, head) {
 496                         if (!strcmp(a->name, iface->name)) {
 497                                 if (c == ula_prefix)
 498                                         ula_assign = a;
 499                                 else if (a->enabled)
 500                                         external_ula = true;
 501                         }
 502                 }
 503
 504         }
 505
 506         // Remove ULA assignment if there is an externally managed ULA and vice versa
 507         if (ula_assign && ((enable && !external_ula) || (!enable && external_ula)))
 508                 interface_set_prefix_address(ula_assign, ula_prefix, iface, enable);
 509 }
 510
 511
 512 static void
 513 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 514                 const struct device_prefix *prefix, struct interface *iface, bool add)
 515 {
 516         const struct interface *uplink = prefix->iface;
 517         if (!iface->l3_dev.dev)
 518                 return;
 519
 520         struct device *l3_downlink = iface->l3_dev.dev;
 521
 522         struct device_addr addr;
 523         memset(&addr, 0, sizeof(addr));
 524         addr.addr.in6 = prefix->addr;
 525         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 526         addr.addr.in6.s6_addr[15] += 1;
 527         addr.mask = assignment->length;
 528         addr.flags = DEVADDR_INET6;
 529         addr.preferred_until = prefix->preferred_until;
 530         addr.valid_until = prefix->valid_until;
 531
 532         if (!add && assignment->enabled) {
 533                 time_t now = system_get_rtime();
 534                 addr.preferred_until = now;
 535                 if (!addr.valid_until || addr.valid_until - now > 7200)
 536                         addr.valid_until = now + 7200;
 537                 system_add_address(l3_downlink, &addr);
 538                 assignment->enabled = false;
 539
 540                 interface_trigger_ula_prefix(iface, prefix, true);
 541         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 542                 system_add_address(l3_downlink, &addr);
 543                 if (uplink && uplink->l3_dev.dev) {
 544                         int mtu = system_update_ipv6_mtu(
 545                                         uplink->l3_dev.dev, 0);
 546                         if (mtu > 0)
 547                                 system_update_ipv6_mtu(l3_downlink, mtu);
 548                 }
 549                 assignment->enabled = true;
 550
 551                 interface_trigger_ula_prefix(iface, prefix, false);
 552         }
 553 }
 554
 555 static bool interface_prefix_assign(struct list_head *list,
 556                 struct device_prefix_assignment *assign)
 557 {
 558         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 559         struct device_prefix_assignment *c;
 560         list_for_each_entry(c, list, head) {
 561                 if (assign->assigned != -1) {
 562                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 563                                 list_add_tail(&assign->head, &c->head);
 564                                 return true;
 565                         }
 566                 } else if (assign->assigned == -1) {
 567                         current = (current + asize) & (~asize);
 568                         if (current + asize < c->assigned) {
 569                                 assign->assigned = current;
 570                                 list_add_tail(&assign->head, &c->head);
 571                                 return true;
 572                         }
 573                 }
 574                 current = (c->assigned + (1 << (64 - c->length)));
 575         }
 576         return false;
 577 }
 578
 579 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 580 {
 581         struct device_prefix_assignment *c;
 582         struct interface *iface;
 583
 584         // Delete all assignments
 585         while (!list_empty(&prefix->assignments)) {
 586                 c = list_first_entry(&prefix->assignments,
 587                                 struct device_prefix_assignment, head);
 588                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 589                         interface_set_prefix_address(c, prefix, iface, false);
 590                 list_del(&c->head);
 591                 free(c);
 592         }
 593
 594         if (!setup)
 595                 return;
 596
 597         // End-of-assignment sentinel
 598         c = malloc(sizeof(*c) + 1);
 599         c->assigned = 1 << (64 - prefix->length);
 600         c->length = 64;
 601         c->name[0] = 0;
 602         list_add(&c->head, &prefix->assignments);
 603
 604         // Excluded prefix
 605         if (prefix->excl_length > 0) {
 606                 const char name[] = "!excluded";
 607                 c = malloc(sizeof(*c) + sizeof(name));
 608                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 609                                 ((1 << (64 - prefix->length)) - 1);
 610                 c->length = prefix->excl_length;
 611                 memcpy(c->name, name, sizeof(name));
 612                 list_add(&c->head, &prefix->assignments);
 613         }
 614
 615         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 616         vlist_for_each_element(&interfaces, iface, node) {
 617                 if (iface->config_ip.assignment_length < 48 ||
 618                                 iface->config_ip.assignment_length > 64)
 619                         continue;
 620
 621                 size_t namelen = strlen(iface->name) + 1;
 622                 c = malloc(sizeof(*c) + namelen);
 623                 c->length = iface->config_ip.assignment_length;
 624                 c->assigned = iface->config_ip.assignment_hint;
 625                 c->enabled = false;
 626                 memcpy(c->name, iface->name, namelen);
 627
 628                 // First process all custom assignments, put all others in later-list
 629                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 630                         if (c->assigned != -1) {
 631                                 c->assigned = -1;
 632                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 633                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 634                         }
 635                         list_add_tail(&c->head, &assign_later);
 636                 }
 637         }
 638
 639         // Then try to assign all other + failed custom assignments
 640         while (!list_empty(&assign_later)) {
 641                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 642                 list_del(&c->head);
 643
 644                 bool assigned = false;
 645                 do {
 646                         assigned = interface_prefix_assign(&prefix->assignments, c);
 647                 } while (!assigned && ++c->length <= 64);
 648
 649                 if (!assigned) {
 650                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 651                                         "of size %hhu for %s\n", c->length, c->name);
 652                         free(c);
 653                 }
 654         }
 655
 656         list_for_each_entry(c, &prefix->assignments, head)
 657                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 658                         interface_set_prefix_address(c, prefix, iface, true);
 659 }
 660
 661
 662 void interface_refresh_assignments(bool hint)
 663 {
 664         static bool refresh = false;
 665         if (!hint && refresh) {
 666                 struct device_prefix *p;
 667                 list_for_each_entry(p, &prefixes, head)
 668                         interface_update_prefix_assignments(p, true);
 669         }
 670         refresh = hint;
 671 }
 672
 673
 674 static void
 675 interface_update_prefix(struct vlist_tree *tree,
 676                              struct vlist_node *node_new,
 677                              struct vlist_node *node_old)
 678 {
 679         struct device_prefix *prefix_old, *prefix_new;
 680         prefix_old = container_of(node_old, struct device_prefix, node);
 681         prefix_new = container_of(node_new, struct device_prefix, node);
 682
 683         struct device_route route;
 684         memset(&route, 0, sizeof(route));
 685         route.flags = DEVADDR_INET6;
 686         route.metric = INT32_MAX;
 687         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 688         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 689
 690         struct device_prefix_assignment *c;
 691         struct interface *iface;
 692
 693         if (node_old && node_new) {
 694                 // Move assignments and refresh addresses to update valid times
 695                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 696
 697                 list_for_each_entry(c, &prefix_new->assignments, head)
 698                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 699                                 interface_set_prefix_address(c, prefix_new, iface, true);
 700         } else if (node_new) {
 701                 // Set null-route to avoid routing loops
 702                 system_add_route(NULL, &route);
 703
 704                 interface_update_prefix_assignments(prefix_new, true);
 705         } else if (node_old) {
 706                 interface_update_prefix_assignments(prefix_old, false);
 707
 708                 // Remove null-route
 709                 system_del_route(NULL, &route);
 710         }
 711
 712         if (node_old) {
 713                 list_del(&prefix_old->head);
 714                 free(prefix_old);
 715         }
 716
 717         if (node_new)
 718                 list_add(&prefix_new->head, &prefixes);
 719
 720 }
 721
 722 struct device_prefix*
 723 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 724                 uint8_t length, time_t valid_until, time_t preferred_until,
 725                 struct in6_addr *excl_addr, uint8_t excl_length)
 726 {
 727         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 728         prefix->length = length;
 729         prefix->addr = *addr;
 730         prefix->preferred_until = preferred_until;
 731         prefix->valid_until = valid_until;
 732         prefix->iface = iface;
 733         INIT_LIST_HEAD(&prefix->assignments);
 734
 735         if (excl_addr) {
 736                 prefix->excl_addr = *excl_addr;
 737                 prefix->excl_length = excl_length;
 738         }
 739
 740         if (iface)
 741                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 742         else
 743                 interface_update_prefix(NULL, &prefix->node, NULL);
 744
 745         return prefix;
 746 }
 747
 748 void
 749 interface_ip_set_ula_prefix(const char *prefix)
 750 {
 751         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 752         if (prefix)
 753                 strncpy(buf, prefix, sizeof(buf) - 1);
 754         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 755
 756         struct in6_addr addr;
 757         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 758                 if (ula_prefix) {
 759                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 760                         ula_prefix = NULL;
 761                 }
 762                 return;
 763         }
 764
 765         int length;
 766         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 767         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 768                 return;
 769
 770         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 771                         ula_prefix->length != length) {
 772                 if (ula_prefix)
 773                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 774
 775                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 776                                 0, 0, NULL, 0);
 777         }
 778 }
 779
 780 void
 781 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 782 {
 783         struct dns_server *s;
 784
 785         s = calloc(1, sizeof(*s));
 786         if (!s)
 787                 return;
 788
 789         s->af = AF_INET;
 790         if (inet_pton(s->af, str, &s->addr.in))
 791                 goto add;
 792
 793         s->af = AF_INET6;
 794         if (inet_pton(s->af, str, &s->addr.in))
 795                 goto add;
 796
 797         free(s);
 798         return;
 799
 800 add:
 801         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 802           s->af == AF_INET6 ? '6' : '4', str);
 803         vlist_simple_add(&ip->dns_servers, &s->node);
 804 }
 805
 806 void
 807 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 808 {
 809         struct blob_attr *cur;
 810         int rem;
 811
 812         blobmsg_for_each_attr(cur, list, rem) {
 813                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 814                         continue;
 815
 816                 if (!blobmsg_check_attr(cur, NULL))
 817                         continue;
 818
 819                 interface_add_dns_server(ip, blobmsg_data(cur));
 820         }
 821 }
 822
 823 static void
 824 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 825 {
 826         struct dns_search_domain *s;
 827         int len = strlen(str);
 828
 829         s = calloc(1, sizeof(*s) + len + 1);
 830         if (!s)
 831                 return;
 832
 833         D(INTERFACE, "Add DNS search domain: %s\n", str);
 834         memcpy(s->name, str, len);
 835         vlist_simple_add(&ip->dns_search, &s->node);
 836 }
 837
 838 void
 839 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 840 {
 841         struct blob_attr *cur;
 842         int rem;
 843
 844         blobmsg_for_each_attr(cur, list, rem) {
 845                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 846                         continue;
 847
 848                 if (!blobmsg_check_attr(cur, NULL))
 849                         continue;
 850
 851                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 852         }
 853 }
 854
 855 static void
 856 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 857 {
 858         struct dns_server *s;
 859         struct dns_search_domain *d;
 860         const char *str;
 861         char buf[INET6_ADDRSTRLEN];
 862
 863         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 864                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 865                 if (!str)
 866                         continue;
 867
 868                 fprintf(f, "nameserver %s\n", str);
 869         }
 870
 871         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 872                 fprintf(f, "search %s\n", d->name);
 873         }
 874 }
 875
 876 void
 877 interface_write_resolv_conf(void)
 878 {
 879         struct interface *iface;
 880         char *path = alloca(strlen(resolv_conf) + 5);
 881         FILE *f;
 882         uint32_t crcold, crcnew;
 883
 884         sprintf(path, "%s.tmp", resolv_conf);
 885         unlink(path);
 886         f = fopen(path, "w+");
 887         if (!f) {
 888                 D(INTERFACE, "Failed to open %s for writing\n", path);
 889                 return;
 890         }
 891
 892         vlist_for_each_element(&interfaces, iface, node) {
 893                 if (iface->state != IFS_UP)
 894                         continue;
 895
 896                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 897                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 898                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 899                     vlist_simple_empty(&iface->config_ip.dns_servers))
 900                         continue;
 901
 902                 fprintf(f, "# Interface %s\n", iface->name);
 903                 write_resolv_conf_entries(f, &iface->config_ip);
 904                 if (!iface->proto_ip.no_dns)
 905                         write_resolv_conf_entries(f, &iface->proto_ip);
 906         }
 907         fflush(f);
 908         rewind(f);
 909         crcnew = crc32_file(f);
 910         fclose(f);
 911
 912         crcold = crcnew + 1;
 913         f = fopen(resolv_conf, "r");
 914         if (f) {
 915                 crcold = crc32_file(f);
 916                 fclose(f);
 917         }
 918
 919         if (crcold == crcnew) {
 920                 unlink(path);
 921         } else if (rename(path, resolv_conf) < 0) {
 922                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 923                 unlink(path);
 924         }
 925 }
 926
 927 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 928 {
 929         struct device_addr *addr;
 930         struct device_route *route;
 931         struct device *dev;
 932
 933         ip->enabled = enabled;
 934         dev = ip->iface->l3_dev.dev;
 935         if (!dev)
 936                 return;
 937
 938         vlist_for_each_element(&ip->addr, addr, node) {
 939                 if (addr->enabled == enabled)
 940                         continue;
 941
 942                 if (enabled)
 943                         system_add_address(dev, addr);
 944                 else
 945                         system_del_address(dev, addr);
 946                 addr->enabled = enabled;
 947         }
 948
 949         vlist_for_each_element(&ip->route, route, node) {
 950                 bool _enabled = enabled;
 951
 952                 if (!enable_route(ip, route))
 953                         _enabled = false;
 954
 955                 if (route->enabled == _enabled)
 956                         continue;
 957
 958                 if (_enabled) {
 959                         if (!(route->flags & DEVROUTE_METRIC))
 960                                 route->metric = ip->iface->metric;
 961
 962                         system_add_route(dev, route);
 963                 } else
 964                         system_del_route(dev, route);
 965                 route->enabled = _enabled;
 966         }
 967
 968         struct device_prefix *c;
 969         struct device_prefix_assignment *a;
 970         list_for_each_entry(c, &prefixes, head)
 971                 list_for_each_entry(a, &c->assignments, head)
 972                         if (!strcmp(a->name, ip->iface->name))
 973                                 interface_set_prefix_address(a, c, ip->iface, enabled);
 974 }
 975
 976 void
 977 interface_ip_update_start(struct interface_ip_settings *ip)
 978 {
 979         if (ip != &ip->iface->config_ip) {
 980                 vlist_simple_update(&ip->dns_servers);
 981                 vlist_simple_update(&ip->dns_search);
 982         }
 983         vlist_update(&ip->route);
 984         vlist_update(&ip->addr);
 985         vlist_update(&ip->prefix);
 986 }
 987
 988 void
 989 interface_ip_update_complete(struct interface_ip_settings *ip)
 990 {
 991         vlist_simple_flush(&ip->dns_servers);
 992         vlist_simple_flush(&ip->dns_search);
 993         vlist_flush(&ip->route);
 994         vlist_flush(&ip->addr);
 995         vlist_flush(&ip->prefix);
 996         interface_write_resolv_conf();
 997 }
 998
 999 void
1000 interface_ip_flush(struct interface_ip_settings *ip)
1001 {
1002         if (ip == &ip->iface->proto_ip)
1003                 vlist_flush_all(&ip->iface->host_routes);
1004         vlist_simple_flush_all(&ip->dns_servers);
1005         vlist_simple_flush_all(&ip->dns_search);
1006         vlist_flush_all(&ip->route);
1007         vlist_flush_all(&ip->addr);
1008         vlist_flush_all(&ip->prefix);
1009 }
1010
1011 static void
1012 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1013 {
1014         ip->iface = iface;
1015         ip->enabled = true;
1016         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1017         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1018         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1019         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1020         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1021 }
1022
1023 void
1024 interface_ip_init(struct interface *iface)
1025 {
1026         __interface_ip_init(&iface->proto_ip, iface);
1027         __interface_ip_init(&iface->config_ip, iface);
1028         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1029
1030 }
1031
1032 static void
1033 interface_ip_valid_until_handler(struct uloop_timeout *t)
1034 {
1035         time_t now = system_get_rtime();
1036         struct interface *iface;
1037         vlist_for_each_element(&interfaces, iface, node) {
1038                 if (iface->state != IFS_UP)
1039                         continue;
1040
1041                 struct device_addr *addr, *addrp;
1042                 struct device_route *route, *routep;
1043                 struct device_prefix *pref, *prefp;
1044
1045                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1046                         if (addr->valid_until && addr->valid_until < now)
1047                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1048
1049                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1050                         if (route->valid_until && route->valid_until < now)
1051                                 vlist_delete(&iface->proto_ip.route, &route->node);
1052
1053                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1054                         if (pref->valid_until && pref->valid_until < now)
1055                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1056
1057         }
1058
1059         uloop_timeout_set(t, 1000);
1060 }
1061
1062 static void __init
1063 interface_ip_init_worker(void)
1064 {
1065         valid_until_timeout.cb = interface_ip_valid_until_handler;
1066         uloop_timeout_set(&valid_until_timeout, 1000);
1067 }