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 int set_ipv6_source_policy(bool add, const union if_addr *addr, uint8_t mask, int ifindex)
  94 {
  95         struct iprule rule = {
  96                 .flags = IPRULE_INET6 | IPRULE_SRC | IPRULE_LOOKUP | IPRULE_PRIORITY,
  97                 .priority = 65535,
  98                 .lookup = interface_ip_resolve_v6_rtable(ifindex),
  99                 .src_addr = *addr,
 100                 .src_mask = mask,
 101         };
 102
 103         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 104 }
 105
 106 static bool
 107 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 108 {
 109         struct device_addr *addr;
 110
 111         vlist_for_each_element(&ip->addr, addr, node) {
 112                 if (!addr->enabled)
 113                         continue;
 114
 115                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 116                         continue;
 117
 118                 // Handle offlink addresses correctly
 119                 unsigned int mask = addr->mask;
 120                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 121                                 (addr->flags & DEVADDR_OFFLINK))
 122                         mask = 128;
 123
 124                 if (!match_if_addr(&addr->addr, a, mask))
 125                         continue;
 126
 127                 return true;
 128         }
 129
 130         return false;
 131 }
 132
 133 static void
 134 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 135                        bool v6, struct device_route **res)
 136 {
 137         struct device_route *route;
 138
 139         vlist_for_each_element(&ip->route, route, node) {
 140                 if (!route->enabled)
 141                         continue;
 142
 143                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 144                         continue;
 145
 146                 if (!match_if_addr(&route->addr, a, route->mask))
 147                         continue;
 148
 149                 if (route->flags & DEVROUTE_TABLE)
 150                         continue;
 151
 152                 if (!*res || route->mask < (*res)->mask)
 153                         *res = route;
 154         }
 155 }
 156
 157 static bool
 158 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 159 {
 160         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 161                __find_ip_addr_target(&iface->config_ip, a, v6);
 162 }
 163
 164 static void
 165 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 166                                bool v6, struct device_route **route)
 167 {
 168         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 169         __find_ip_route_target(&iface->config_ip, a, v6, route);
 170 }
 171
 172 struct interface *
 173 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
 174 {
 175         struct device_route *route, *r_next = NULL;
 176         bool defaultroute_target = false;
 177         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 178
 179         route = calloc(1, sizeof(*route));
 180         if (!route)
 181                 return NULL;
 182
 183         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 184         route->mask = v6 ? 128 : 32;
 185         if (memcmp(&route->addr, addr, addrsize) == 0)
 186                 defaultroute_target = true;
 187         else
 188                 memcpy(&route->addr, addr, addrsize);
 189
 190         if (iface) {
 191                 /* look for locally addressable target first */
 192                 if (interface_ip_find_addr_target(iface, addr, v6))
 193                         goto done;
 194
 195                 /* do not stop at the first route, let the lookup compare
 196                  * masks to find the best match */
 197                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 198         } else {
 199                 vlist_for_each_element(&interfaces, iface, node) {
 200                         /* look for locally addressable target first */
 201                         if (interface_ip_find_addr_target(iface, addr, v6))
 202                                 goto done;
 203
 204                         /* do not stop at the first route, let the lookup compare
 205                          * masks to find the best match */
 206                         interface_ip_find_route_target(iface, addr, v6, &r_next);
 207                 }
 208         }
 209
 210         if (!r_next) {
 211                 free(route);
 212                 return NULL;
 213         }
 214
 215         iface = r_next->iface;
 216         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 217         route->mtu = r_next->mtu;
 218         route->metric = r_next->metric;
 219         route->table = r_next->table;
 220
 221 done:
 222         route->iface = iface;
 223         if (defaultroute_target)
 224                 free(route);
 225         else
 226                 vlist_add(&iface->host_routes, &route->node, route);
 227         return iface;
 228 }
 229
 230 void
 231 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 232 {
 233         struct interface_ip_settings *ip;
 234         struct blob_attr *tb[__ROUTE_MAX], *cur;
 235         struct device_route *route;
 236         int af = v6 ? AF_INET6 : AF_INET;
 237         bool is_v6_proto_route = v6 && iface;
 238
 239         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 240
 241         if (!iface) {
 242                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 243                         return;
 244
 245                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 246                 if (!iface)
 247                         return;
 248
 249                 ip = &iface->config_ip;
 250         } else {
 251                 ip = &iface->proto_ip;
 252         }
 253
 254         route = calloc(1, sizeof(*route));
 255         if (!route)
 256                 return;
 257
 258         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 259         route->mask = v6 ? 128 : 32;
 260         if ((cur = tb[ROUTE_MASK]) != NULL) {
 261                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 262                 if (route->mask > (v6 ? 128 : 32))
 263                         goto error;
 264         }
 265
 266         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 267                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 268                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 269                         goto error;
 270                 }
 271         }
 272
 273         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 274                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 275                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 276                         goto error;
 277                 }
 278         }
 279
 280         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 281                 route->metric = blobmsg_get_u32(cur);
 282                 route->flags |= DEVROUTE_METRIC;
 283         }
 284
 285         if ((cur = tb[ROUTE_MTU]) != NULL) {
 286                 route->mtu = blobmsg_get_u32(cur);
 287                 route->flags |= DEVROUTE_MTU;
 288         }
 289
 290         // Use source-based routing
 291         if (is_v6_proto_route) {
 292                 route->table = interface_ip_resolve_v6_rtable(iface->l3_dev.dev->ifindex);
 293                 route->flags |= DEVROUTE_SRCTABLE;
 294         }
 295
 296         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 297                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 298                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 299                         goto error;
 300                 }
 301
 302                 if (route->table)
 303                         route->flags |= DEVROUTE_TABLE;
 304         }
 305
 306         if ((cur = tb[ROUTE_VALID]) != NULL)
 307                 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
 308
 309         vlist_add(&ip->route, &route->node, route);
 310         return;
 311
 312 error:
 313         free(route);
 314 }
 315
 316 static int
 317 addr_cmp(const void *k1, const void *k2, void *ptr)
 318 {
 319         return memcmp(k1, k2, sizeof(struct device_addr) -
 320                       offsetof(struct device_addr, flags));
 321 }
 322
 323 static int
 324 route_cmp(const void *k1, const void *k2, void *ptr)
 325 {
 326         const struct device_route *r1 = k1, *r2 = k2;
 327
 328         if (r1->mask != r2->mask)
 329                 return r2->mask - r1->mask;
 330
 331         if (r1->metric != r2->metric)
 332                 return r1->metric - r2->metric;
 333
 334         if (r1->flags != r2->flags)
 335                 return r2->flags - r1->flags;
 336
 337         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 338 }
 339
 340 static int
 341 prefix_cmp(const void *k1, const void *k2, void *ptr)
 342 {
 343         return memcmp(k1, k2, sizeof(struct device_prefix) -
 344                         offsetof(struct device_prefix, addr));
 345 }
 346
 347 static void
 348 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 349 {
 350         struct device *dev = iface->l3_dev.dev;
 351         struct device_route route;
 352
 353         memset(&route, 0, sizeof(route));
 354         route.iface = iface;
 355         route.flags = addr->flags;
 356         route.mask = addr->mask;
 357         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 358         clear_if_addr(&route.addr, route.mask);
 359
 360         if (add) {
 361                 route.flags |= DEVADDR_KERNEL;
 362                 system_del_route(dev, &route);
 363
 364                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 365                         route.flags &= ~DEVADDR_KERNEL;
 366                         route.metric = iface->metric;
 367                         system_add_route(dev, &route);
 368                 }
 369         } else {
 370                 if (!(addr->flags & DEVADDR_OFFLINK))
 371                         system_del_route(dev, &route);
 372         }
 373 }
 374
 375 static void
 376 interface_update_proto_addr(struct vlist_tree *tree,
 377                             struct vlist_node *node_new,
 378                             struct vlist_node *node_old)
 379 {
 380         struct interface_ip_settings *ip;
 381         struct interface *iface;
 382         struct device *dev;
 383         struct device_addr *a_new = NULL, *a_old = NULL;
 384         bool keep = false;
 385
 386         ip = container_of(tree, struct interface_ip_settings, addr);
 387         iface = ip->iface;
 388         dev = iface->l3_dev.dev;
 389
 390         if (node_new) {
 391                 a_new = container_of(node_new, struct device_addr, node);
 392
 393                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 394                     !a_new->broadcast) {
 395
 396                         uint32_t mask = ~0;
 397                         uint32_t *a = (uint32_t *) &a_new->addr;
 398
 399                         mask >>= a_new->mask;
 400                         a_new->broadcast = *a | htonl(mask);
 401                 }
 402         }
 403
 404         if (node_old)
 405                 a_old = container_of(node_old, struct device_addr, node);
 406
 407         if (a_new && a_old) {
 408                 keep = true;
 409
 410                 if (a_old->flags != a_new->flags ||
 411                                 a_old->valid_until != a_new->valid_until ||
 412                                 a_old->preferred_until != a_new->preferred_until)
 413                         keep = false;
 414
 415                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 416                     a_new->broadcast != a_old->broadcast)
 417                         keep = false;
 418         }
 419
 420         if (node_old) {
 421                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 422                         interface_handle_subnet_route(iface, a_old, false);
 423
 424                         if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 425                                 set_ipv6_source_policy(false, &a_old->addr, a_old->mask, dev->ifindex);
 426
 427                         system_del_address(dev, a_old);
 428                 }
 429                 free(a_old);
 430         }
 431
 432         if (node_new) {
 433                 a_new->enabled = true;
 434                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 435                         system_add_address(dev, a_new);
 436
 437                         if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 438                                 set_ipv6_source_policy(true, &a_new->addr, a_new->mask, dev->ifindex);
 439
 440                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 441                                 interface_handle_subnet_route(iface, a_new, true);
 442                 }
 443         }
 444 }
 445
 446 static bool
 447 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 448 {
 449         if (ip->no_defaultroute && !route->mask)
 450                 return false;
 451
 452         return ip->enabled;
 453 }
 454
 455 static void
 456 interface_update_proto_route(struct vlist_tree *tree,
 457                              struct vlist_node *node_new,
 458                              struct vlist_node *node_old)
 459 {
 460         struct interface_ip_settings *ip;
 461         struct interface *iface;
 462         struct device *dev;
 463         struct device_route *route_old, *route_new;
 464         bool keep = false;
 465
 466         ip = container_of(tree, struct interface_ip_settings, route);
 467         iface = ip->iface;
 468         dev = iface->l3_dev.dev;
 469
 470         route_old = container_of(node_old, struct device_route, node);
 471         route_new = container_of(node_new, struct device_route, node);
 472
 473         if (node_old && node_new)
 474                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 475
 476         if (node_old) {
 477                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 478                         system_del_route(dev, route_old);
 479                 free(route_old);
 480         }
 481
 482         if (node_new) {
 483                 bool _enabled = enable_route(ip, route_new);
 484
 485                 if (!(route_new->flags & DEVROUTE_METRIC))
 486                         route_new->metric = iface->metric;
 487
 488                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 489                         system_add_route(dev, route_new);
 490
 491                 route_new->iface = iface;
 492                 route_new->enabled = _enabled;
 493         }
 494 }
 495
 496 static void
 497 interface_update_host_route(struct vlist_tree *tree,
 498                              struct vlist_node *node_new,
 499                              struct vlist_node *node_old)
 500 {
 501         struct interface *iface;
 502         struct device *dev;
 503         struct device_route *route_old, *route_new;
 504
 505         iface = container_of(tree, struct interface, host_routes);
 506         dev = iface->l3_dev.dev;
 507
 508         route_old = container_of(node_old, struct device_route, node);
 509         route_new = container_of(node_new, struct device_route, node);
 510
 511         if (node_old) {
 512                 system_del_route(dev, route_old);
 513                 free(route_old);
 514         }
 515
 516         if (node_new)
 517                 system_add_route(dev, route_new);
 518 }
 519
 520
 521 static void
 522 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 523                 const struct device_prefix *prefix, struct interface *iface, bool add);
 524
 525 static void interface_trigger_ula_prefix(struct interface *iface,
 526                 const struct device_prefix *prefix, bool enable)
 527 {
 528         if (prefix == ula_prefix || (prefix->addr.s6_addr[0] & 0xfe) != 0xfc)
 529                 return;
 530
 531         bool external_ula = false;
 532         struct device_prefix_assignment *ula_assign = NULL;
 533         struct device_prefix *c;
 534         list_for_each_entry(c, &prefixes, head) {
 535                 if (c != ula_prefix && (c->addr.s6_addr[0] & 0xfe) != 0xfc)
 536                         continue;
 537
 538                 struct device_prefix_assignment *a;
 539                 list_for_each_entry(a, &c->assignments, head) {
 540                         if (!strcmp(a->name, iface->name)) {
 541                                 if (c == ula_prefix)
 542                                         ula_assign = a;
 543                                 else if (a->enabled)
 544                                         external_ula = true;
 545                         }
 546                 }
 547
 548         }
 549
 550         // Remove ULA assignment if there is an externally managed ULA and vice versa
 551         if (ula_assign && ((enable && !external_ula) || (!enable && external_ula)))
 552                 interface_set_prefix_address(ula_assign, ula_prefix, iface, enable);
 553 }
 554
 555
 556 static void
 557 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 558                 const struct device_prefix *prefix, struct interface *iface, bool add)
 559 {
 560         const struct interface *uplink = prefix->iface;
 561         if (!iface->l3_dev.dev)
 562                 return;
 563
 564         struct device *l3_downlink = iface->l3_dev.dev;
 565
 566         struct device_addr addr;
 567         memset(&addr, 0, sizeof(addr));
 568         addr.addr.in6 = prefix->addr;
 569         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 570         addr.addr.in6.s6_addr[15] += 1;
 571         addr.mask = assignment->length;
 572         addr.flags = DEVADDR_INET6;
 573         addr.preferred_until = prefix->preferred_until;
 574         addr.valid_until = prefix->valid_until;
 575
 576         if (!add && assignment->enabled) {
 577                 time_t now = system_get_rtime();
 578                 addr.preferred_until = now;
 579                 if (!addr.valid_until || addr.valid_until - now > 7200)
 580                         addr.valid_until = now + 7200;
 581                 system_add_address(l3_downlink, &addr);
 582                 assignment->enabled = false;
 583
 584                 interface_trigger_ula_prefix(iface, prefix, true);
 585         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 586                 system_add_address(l3_downlink, &addr);
 587                 if (uplink && uplink->l3_dev.dev) {
 588                         int mtu = system_update_ipv6_mtu(
 589                                         uplink->l3_dev.dev, 0);
 590                         if (mtu > 0)
 591                                 system_update_ipv6_mtu(l3_downlink, mtu);
 592                 }
 593                 assignment->enabled = true;
 594
 595                 interface_trigger_ula_prefix(iface, prefix, false);
 596         }
 597 }
 598
 599 static bool interface_prefix_assign(struct list_head *list,
 600                 struct device_prefix_assignment *assign)
 601 {
 602         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 603         struct device_prefix_assignment *c;
 604         list_for_each_entry(c, list, head) {
 605                 if (assign->assigned != -1) {
 606                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 607                                 list_add_tail(&assign->head, &c->head);
 608                                 return true;
 609                         }
 610                 } else if (assign->assigned == -1) {
 611                         current = (current + asize) & (~asize);
 612                         if (current + asize < c->assigned) {
 613                                 assign->assigned = current;
 614                                 list_add_tail(&assign->head, &c->head);
 615                                 return true;
 616                         }
 617                 }
 618                 current = (c->assigned + (1 << (64 - c->length)));
 619         }
 620         return false;
 621 }
 622
 623 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 624 {
 625         struct device_prefix_assignment *c;
 626         struct interface *iface;
 627
 628         // Delete all assignments
 629         while (!list_empty(&prefix->assignments)) {
 630                 c = list_first_entry(&prefix->assignments,
 631                                 struct device_prefix_assignment, head);
 632                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 633                         interface_set_prefix_address(c, prefix, iface, false);
 634                 list_del(&c->head);
 635                 free(c);
 636         }
 637
 638         if (!setup)
 639                 return;
 640
 641         // End-of-assignment sentinel
 642         c = malloc(sizeof(*c) + 1);
 643         c->assigned = 1 << (64 - prefix->length);
 644         c->length = 64;
 645         c->name[0] = 0;
 646         list_add(&c->head, &prefix->assignments);
 647
 648         // Excluded prefix
 649         if (prefix->excl_length > 0) {
 650                 const char name[] = "!excluded";
 651                 c = malloc(sizeof(*c) + sizeof(name));
 652                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 653                                 ((1 << (64 - prefix->length)) - 1);
 654                 c->length = prefix->excl_length;
 655                 memcpy(c->name, name, sizeof(name));
 656                 list_add(&c->head, &prefix->assignments);
 657         }
 658
 659         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 660         vlist_for_each_element(&interfaces, iface, node) {
 661                 if (iface->config_ip.assignment_length < 48 ||
 662                                 iface->config_ip.assignment_length > 64)
 663                         continue;
 664
 665                 size_t namelen = strlen(iface->name) + 1;
 666                 c = malloc(sizeof(*c) + namelen);
 667                 c->length = iface->config_ip.assignment_length;
 668                 c->assigned = iface->config_ip.assignment_hint;
 669                 c->enabled = false;
 670                 memcpy(c->name, iface->name, namelen);
 671
 672                 // First process all custom assignments, put all others in later-list
 673                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 674                         if (c->assigned != -1) {
 675                                 c->assigned = -1;
 676                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 677                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 678                         }
 679                         list_add_tail(&c->head, &assign_later);
 680                 }
 681         }
 682
 683         // Then try to assign all other + failed custom assignments
 684         while (!list_empty(&assign_later)) {
 685                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 686                 list_del(&c->head);
 687
 688                 bool assigned = false;
 689                 do {
 690                         assigned = interface_prefix_assign(&prefix->assignments, c);
 691                 } while (!assigned && ++c->length <= 64);
 692
 693                 if (!assigned) {
 694                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 695                                         "of size %hhu for %s\n", c->length, c->name);
 696                         free(c);
 697                 }
 698         }
 699
 700         list_for_each_entry(c, &prefix->assignments, head)
 701                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 702                         interface_set_prefix_address(c, prefix, iface, true);
 703 }
 704
 705
 706 void interface_refresh_assignments(bool hint)
 707 {
 708         static bool refresh = false;
 709         if (!hint && refresh) {
 710                 struct device_prefix *p;
 711                 list_for_each_entry(p, &prefixes, head)
 712                         interface_update_prefix_assignments(p, true);
 713         }
 714         refresh = hint;
 715 }
 716
 717
 718 static void
 719 interface_update_prefix(struct vlist_tree *tree,
 720                              struct vlist_node *node_new,
 721                              struct vlist_node *node_old)
 722 {
 723         struct device_prefix *prefix_old, *prefix_new;
 724         prefix_old = container_of(node_old, struct device_prefix, node);
 725         prefix_new = container_of(node_new, struct device_prefix, node);
 726
 727         struct device_route route;
 728         memset(&route, 0, sizeof(route));
 729         route.flags = DEVADDR_INET6;
 730         route.metric = INT32_MAX;
 731         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 732         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 733
 734
 735         struct device_prefix_assignment *c;
 736         struct interface *iface;
 737
 738         if (node_old && node_new) {
 739                 // Move assignments and refresh addresses to update valid times
 740                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 741
 742                 list_for_each_entry(c, &prefix_new->assignments, head)
 743                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 744                                 interface_set_prefix_address(c, prefix_new, iface, true);
 745         } else if (node_new) {
 746                 // Set null-route to avoid routing loops and set routing policy
 747                 system_add_route(NULL, &route);
 748                 if (prefix_new->iface)
 749                         set_ipv6_source_policy(true, &route.addr, route.mask,
 750                                         prefix_new->iface->l3_dev.dev->ifindex);
 751
 752
 753                 interface_update_prefix_assignments(prefix_new, true);
 754         } else if (node_old) {
 755                 interface_update_prefix_assignments(prefix_old, false);
 756
 757                 // Remove null-route
 758                 if (prefix_old->iface)
 759                         set_ipv6_source_policy(false, &route.addr, route.mask,
 760                                         prefix_old->iface->l3_dev.dev->ifindex);
 761                 system_del_route(NULL, &route);
 762         }
 763
 764         if (node_old) {
 765                 list_del(&prefix_old->head);
 766                 free(prefix_old);
 767         }
 768
 769         if (node_new)
 770                 list_add(&prefix_new->head, &prefixes);
 771
 772 }
 773
 774 struct device_prefix*
 775 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 776                 uint8_t length, time_t valid_until, time_t preferred_until,
 777                 struct in6_addr *excl_addr, uint8_t excl_length)
 778 {
 779         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 780         prefix->length = length;
 781         prefix->addr = *addr;
 782         prefix->preferred_until = preferred_until;
 783         prefix->valid_until = valid_until;
 784         prefix->iface = iface;
 785         INIT_LIST_HEAD(&prefix->assignments);
 786
 787         if (excl_addr) {
 788                 prefix->excl_addr = *excl_addr;
 789                 prefix->excl_length = excl_length;
 790         }
 791
 792         if (iface)
 793                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 794         else
 795                 interface_update_prefix(NULL, &prefix->node, NULL);
 796
 797         return prefix;
 798 }
 799
 800 void
 801 interface_ip_set_ula_prefix(const char *prefix)
 802 {
 803         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 804         if (prefix)
 805                 strncpy(buf, prefix, sizeof(buf) - 1);
 806         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 807
 808         struct in6_addr addr;
 809         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 810                 if (ula_prefix) {
 811                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 812                         ula_prefix = NULL;
 813                 }
 814                 return;
 815         }
 816
 817         int length;
 818         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 819         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 820                 return;
 821
 822         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 823                         ula_prefix->length != length) {
 824                 if (ula_prefix)
 825                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 826
 827                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 828                                 0, 0, NULL, 0);
 829         }
 830 }
 831
 832 int interface_ip_resolve_v6_rtable(int ifindex)
 833 {
 834         return ifindex + 1000;
 835 }
 836
 837 void
 838 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 839 {
 840         struct dns_server *s;
 841
 842         s = calloc(1, sizeof(*s));
 843         if (!s)
 844                 return;
 845
 846         s->af = AF_INET;
 847         if (inet_pton(s->af, str, &s->addr.in))
 848                 goto add;
 849
 850         s->af = AF_INET6;
 851         if (inet_pton(s->af, str, &s->addr.in))
 852                 goto add;
 853
 854         free(s);
 855         return;
 856
 857 add:
 858         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 859           s->af == AF_INET6 ? '6' : '4', str);
 860         vlist_simple_add(&ip->dns_servers, &s->node);
 861 }
 862
 863 void
 864 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 865 {
 866         struct blob_attr *cur;
 867         int rem;
 868
 869         blobmsg_for_each_attr(cur, list, rem) {
 870                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 871                         continue;
 872
 873                 if (!blobmsg_check_attr(cur, NULL))
 874                         continue;
 875
 876                 interface_add_dns_server(ip, blobmsg_data(cur));
 877         }
 878 }
 879
 880 static void
 881 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 882 {
 883         struct dns_search_domain *s;
 884         int len = strlen(str);
 885
 886         s = calloc(1, sizeof(*s) + len + 1);
 887         if (!s)
 888                 return;
 889
 890         D(INTERFACE, "Add DNS search domain: %s\n", str);
 891         memcpy(s->name, str, len);
 892         vlist_simple_add(&ip->dns_search, &s->node);
 893 }
 894
 895 void
 896 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 897 {
 898         struct blob_attr *cur;
 899         int rem;
 900
 901         blobmsg_for_each_attr(cur, list, rem) {
 902                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 903                         continue;
 904
 905                 if (!blobmsg_check_attr(cur, NULL))
 906                         continue;
 907
 908                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 909         }
 910 }
 911
 912 static void
 913 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 914 {
 915         struct dns_server *s;
 916         struct dns_search_domain *d;
 917         const char *str;
 918         char buf[INET6_ADDRSTRLEN];
 919
 920         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 921                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 922                 if (!str)
 923                         continue;
 924
 925                 fprintf(f, "nameserver %s\n", str);
 926         }
 927
 928         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 929                 fprintf(f, "search %s\n", d->name);
 930         }
 931 }
 932
 933 void
 934 interface_write_resolv_conf(void)
 935 {
 936         struct interface *iface;
 937         char *path = alloca(strlen(resolv_conf) + 5);
 938         FILE *f;
 939         uint32_t crcold, crcnew;
 940
 941         sprintf(path, "%s.tmp", resolv_conf);
 942         unlink(path);
 943         f = fopen(path, "w+");
 944         if (!f) {
 945                 D(INTERFACE, "Failed to open %s for writing\n", path);
 946                 return;
 947         }
 948
 949         vlist_for_each_element(&interfaces, iface, node) {
 950                 if (iface->state != IFS_UP)
 951                         continue;
 952
 953                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 954                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 955                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 956                     vlist_simple_empty(&iface->config_ip.dns_servers))
 957                         continue;
 958
 959                 fprintf(f, "# Interface %s\n", iface->name);
 960                 write_resolv_conf_entries(f, &iface->config_ip);
 961                 if (!iface->proto_ip.no_dns)
 962                         write_resolv_conf_entries(f, &iface->proto_ip);
 963         }
 964         fflush(f);
 965         rewind(f);
 966         crcnew = crc32_file(f);
 967         fclose(f);
 968
 969         crcold = crcnew + 1;
 970         f = fopen(resolv_conf, "r");
 971         if (f) {
 972                 crcold = crc32_file(f);
 973                 fclose(f);
 974         }
 975
 976         if (crcold == crcnew) {
 977                 unlink(path);
 978         } else if (rename(path, resolv_conf) < 0) {
 979                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 980                 unlink(path);
 981         }
 982 }
 983
 984 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 985 {
 986         struct device_addr *addr;
 987         struct device_route *route;
 988         struct device *dev;
 989
 990         ip->enabled = enabled;
 991         dev = ip->iface->l3_dev.dev;
 992         if (!dev)
 993                 return;
 994
 995         vlist_for_each_element(&ip->addr, addr, node) {
 996                 if (addr->enabled == enabled)
 997                         continue;
 998
 999                 if (enabled)
1000                         system_add_address(dev, addr);
1001                 else
1002                         system_del_address(dev, addr);
1003                 addr->enabled = enabled;
1004         }
1005
1006         vlist_for_each_element(&ip->route, route, node) {
1007                 bool _enabled = enabled;
1008
1009                 if (!enable_route(ip, route))
1010                         _enabled = false;
1011
1012                 if (route->enabled == _enabled)
1013                         continue;
1014
1015                 if (_enabled) {
1016                         if (!(route->flags & DEVROUTE_METRIC))
1017                                 route->metric = ip->iface->metric;
1018
1019                         system_add_route(dev, route);
1020                 } else
1021                         system_del_route(dev, route);
1022                 route->enabled = _enabled;
1023         }
1024
1025         struct device_prefix *c;
1026         struct device_prefix_assignment *a;
1027         list_for_each_entry(c, &prefixes, head)
1028                 list_for_each_entry(a, &c->assignments, head)
1029                         if (!strcmp(a->name, ip->iface->name))
1030                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1031 }
1032
1033 void
1034 interface_ip_update_start(struct interface_ip_settings *ip)
1035 {
1036         if (ip != &ip->iface->config_ip) {
1037                 vlist_simple_update(&ip->dns_servers);
1038                 vlist_simple_update(&ip->dns_search);
1039         }
1040         vlist_update(&ip->route);
1041         vlist_update(&ip->addr);
1042         vlist_update(&ip->prefix);
1043 }
1044
1045 void
1046 interface_ip_update_complete(struct interface_ip_settings *ip)
1047 {
1048         vlist_simple_flush(&ip->dns_servers);
1049         vlist_simple_flush(&ip->dns_search);
1050         vlist_flush(&ip->route);
1051         vlist_flush(&ip->addr);
1052         vlist_flush(&ip->prefix);
1053         interface_write_resolv_conf();
1054 }
1055
1056 void
1057 interface_ip_flush(struct interface_ip_settings *ip)
1058 {
1059         if (ip == &ip->iface->proto_ip)
1060                 vlist_flush_all(&ip->iface->host_routes);
1061         vlist_simple_flush_all(&ip->dns_servers);
1062         vlist_simple_flush_all(&ip->dns_search);
1063         vlist_flush_all(&ip->route);
1064         vlist_flush_all(&ip->addr);
1065         vlist_flush_all(&ip->prefix);
1066 }
1067
1068 static void
1069 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1070 {
1071         ip->iface = iface;
1072         ip->enabled = true;
1073         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1074         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1075         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1076         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1077         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1078 }
1079
1080 void
1081 interface_ip_init(struct interface *iface)
1082 {
1083         __interface_ip_init(&iface->proto_ip, iface);
1084         __interface_ip_init(&iface->config_ip, iface);
1085         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1086
1087 }
1088
1089 static void
1090 interface_ip_valid_until_handler(struct uloop_timeout *t)
1091 {
1092         time_t now = system_get_rtime();
1093         struct interface *iface;
1094         vlist_for_each_element(&interfaces, iface, node) {
1095                 if (iface->state != IFS_UP)
1096                         continue;
1097
1098                 struct device_addr *addr, *addrp;
1099                 struct device_route *route, *routep;
1100                 struct device_prefix *pref, *prefp;
1101
1102                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1103                         if (addr->valid_until && addr->valid_until < now)
1104                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1105
1106                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1107                         if (route->valid_until && route->valid_until < now)
1108                                 vlist_delete(&iface->proto_ip.route, &route->node);
1109
1110                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1111                         if (pref->valid_until && pref->valid_until < now)
1112                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1113
1114         }
1115
1116         uloop_timeout_set(t, 1000);
1117 }
1118
1119 static void __init
1120 interface_ip_init_worker(void)
1121 {
1122         valid_until_timeout.cb = interface_ip_valid_until_handler;
1123         uloop_timeout_set(&valid_until_timeout, 1000);
1124 }