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_ip_source_policy(bool add, bool v6, unsigned int priority,
  94                 const union if_addr *addr, uint8_t mask, struct interface *iface)
  95 {
  96
  97
  98         struct iprule rule = {
  99                 .flags = IPRULE_SRC | IPRULE_LOOKUP | IPRULE_PRIORITY,
 100                 .priority = priority,
 101                 .lookup = (v6) ? iface->ip6table : iface->ip4table,
 102                 .src_addr = *addr,
 103                 .src_mask = mask,
 104         };
 105
 106         if (!rule.lookup)
 107                 return 0;
 108
 109         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 110
 111         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 112 }
 113
 114 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
 115 {
 116         struct iprule rule = {
 117                 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
 118                 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
 119                 .lookup = (v6) ? iface->ip6table : iface->ip4table,
 120                 .in_dev = "lo"
 121         };
 122
 123         if (!rule.lookup)
 124                 return 0;
 125
 126         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 127
 128         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 129 }
 130
 131 static bool
 132 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 133 {
 134         struct device_addr *addr;
 135
 136         vlist_for_each_element(&ip->addr, addr, node) {
 137                 if (!addr->enabled)
 138                         continue;
 139
 140                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 141                         continue;
 142
 143                 // Handle offlink addresses correctly
 144                 unsigned int mask = addr->mask;
 145                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 146                                 (addr->flags & DEVADDR_OFFLINK))
 147                         mask = 128;
 148
 149                 if (!match_if_addr(&addr->addr, a, mask))
 150                         continue;
 151
 152                 return true;
 153         }
 154
 155         return false;
 156 }
 157
 158 static void
 159 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 160                        bool v6, struct device_route **res)
 161 {
 162         struct device_route *route;
 163
 164         vlist_for_each_element(&ip->route, route, node) {
 165                 if (!route->enabled)
 166                         continue;
 167
 168                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 169                         continue;
 170
 171                 if (!match_if_addr(&route->addr, a, route->mask))
 172                         continue;
 173
 174                 if (route->flags & DEVROUTE_TABLE)
 175                         continue;
 176
 177                 if (!*res || route->mask < (*res)->mask)
 178                         *res = route;
 179         }
 180 }
 181
 182 static bool
 183 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 184 {
 185         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 186                __find_ip_addr_target(&iface->config_ip, a, v6);
 187 }
 188
 189 static void
 190 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 191                                bool v6, struct device_route **route)
 192 {
 193         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 194         __find_ip_route_target(&iface->config_ip, a, v6, route);
 195 }
 196
 197 struct interface *
 198 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
 199 {
 200         struct device_route *route, *r_next = NULL;
 201         bool defaultroute_target = false;
 202         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 203
 204         route = calloc(1, sizeof(*route));
 205         if (!route)
 206                 return NULL;
 207
 208         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 209         route->mask = v6 ? 128 : 32;
 210         if (memcmp(&route->addr, addr, addrsize) == 0)
 211                 defaultroute_target = true;
 212         else
 213                 memcpy(&route->addr, addr, addrsize);
 214
 215         if (iface) {
 216                 /* look for locally addressable target first */
 217                 if (interface_ip_find_addr_target(iface, addr, v6))
 218                         goto done;
 219
 220                 /* do not stop at the first route, let the lookup compare
 221                  * masks to find the best match */
 222                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 223         } else {
 224                 vlist_for_each_element(&interfaces, iface, node) {
 225                         /* look for locally addressable target first */
 226                         if (interface_ip_find_addr_target(iface, addr, v6))
 227                                 goto done;
 228
 229                         /* do not stop at the first route, let the lookup compare
 230                          * masks to find the best match */
 231                         interface_ip_find_route_target(iface, addr, v6, &r_next);
 232                 }
 233         }
 234
 235         if (!r_next) {
 236                 free(route);
 237                 return NULL;
 238         }
 239
 240         iface = r_next->iface;
 241         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 242         route->mtu = r_next->mtu;
 243         route->metric = r_next->metric;
 244         route->table = r_next->table;
 245
 246 done:
 247         route->iface = iface;
 248         if (defaultroute_target)
 249                 free(route);
 250         else
 251                 vlist_add(&iface->host_routes, &route->node, route);
 252         return iface;
 253 }
 254
 255 void
 256 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 257 {
 258         struct interface_ip_settings *ip;
 259         struct blob_attr *tb[__ROUTE_MAX], *cur;
 260         struct device_route *route;
 261         int af = v6 ? AF_INET6 : AF_INET;
 262         bool is_proto_route = !!iface;
 263
 264         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 265
 266         if (!iface) {
 267                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 268                         return;
 269
 270                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 271                 if (!iface)
 272                         return;
 273
 274                 ip = &iface->config_ip;
 275         } else {
 276                 ip = &iface->proto_ip;
 277         }
 278
 279         route = calloc(1, sizeof(*route));
 280         if (!route)
 281                 return;
 282
 283         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 284         route->mask = v6 ? 128 : 32;
 285         if ((cur = tb[ROUTE_MASK]) != NULL) {
 286                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 287                 if (route->mask > (v6 ? 128 : 32))
 288                         goto error;
 289         }
 290
 291         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 292                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 293                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 294                         goto error;
 295                 }
 296         }
 297
 298         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 299                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 300                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 301                         goto error;
 302                 }
 303         }
 304
 305         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 306                 route->metric = blobmsg_get_u32(cur);
 307                 route->flags |= DEVROUTE_METRIC;
 308         }
 309
 310         if ((cur = tb[ROUTE_MTU]) != NULL) {
 311                 route->mtu = blobmsg_get_u32(cur);
 312                 route->flags |= DEVROUTE_MTU;
 313         }
 314
 315         // Use source-based routing
 316         if (is_proto_route) {
 317                 route->table = (v6) ? iface->ip6table : iface->ip4table;
 318                 route->flags |= DEVROUTE_SRCTABLE;
 319         }
 320
 321         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 322                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 323                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 324                         goto error;
 325                 }
 326
 327                 if (route->table)
 328                         route->flags |= DEVROUTE_TABLE;
 329         }
 330
 331         if ((cur = tb[ROUTE_VALID]) != NULL)
 332                 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
 333
 334         vlist_add(&ip->route, &route->node, route);
 335         return;
 336
 337 error:
 338         free(route);
 339 }
 340
 341 static int
 342 addr_cmp(const void *k1, const void *k2, void *ptr)
 343 {
 344         return memcmp(k1, k2, sizeof(struct device_addr) -
 345                       offsetof(struct device_addr, flags));
 346 }
 347
 348 static int
 349 route_cmp(const void *k1, const void *k2, void *ptr)
 350 {
 351         const struct device_route *r1 = k1, *r2 = k2;
 352
 353         if (r1->mask != r2->mask)
 354                 return r2->mask - r1->mask;
 355
 356         if (r1->metric != r2->metric)
 357                 return r1->metric - r2->metric;
 358
 359         if (r1->flags != r2->flags)
 360                 return r2->flags - r1->flags;
 361
 362         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 363 }
 364
 365 static int
 366 prefix_cmp(const void *k1, const void *k2, void *ptr)
 367 {
 368         return memcmp(k1, k2, sizeof(struct device_prefix) -
 369                         offsetof(struct device_prefix, addr));
 370 }
 371
 372 static void
 373 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 374 {
 375         struct device *dev = iface->l3_dev.dev;
 376         struct device_route route;
 377
 378         memset(&route, 0, sizeof(route));
 379         route.iface = iface;
 380         route.flags = addr->flags;
 381         route.mask = addr->mask;
 382         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 383         clear_if_addr(&route.addr, route.mask);
 384
 385         if (add) {
 386                 route.flags |= DEVADDR_KERNEL;
 387                 system_del_route(dev, &route);
 388
 389                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 390                         route.flags &= ~DEVADDR_KERNEL;
 391                         route.metric = iface->metric;
 392                         system_add_route(dev, &route);
 393                 }
 394         } else {
 395                 if (!(addr->flags & DEVADDR_OFFLINK))
 396                         system_del_route(dev, &route);
 397         }
 398 }
 399
 400 static void
 401 interface_update_proto_addr(struct vlist_tree *tree,
 402                             struct vlist_node *node_new,
 403                             struct vlist_node *node_old)
 404 {
 405         struct interface_ip_settings *ip;
 406         struct interface *iface;
 407         struct device *dev;
 408         struct device_addr *a_new = NULL, *a_old = NULL;
 409         bool keep = false;
 410         bool v6 = false;
 411
 412         ip = container_of(tree, struct interface_ip_settings, addr);
 413         iface = ip->iface;
 414         dev = iface->l3_dev.dev;
 415
 416         if (node_new) {
 417                 a_new = container_of(node_new, struct device_addr, node);
 418
 419                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 420                     !a_new->broadcast) {
 421
 422                         uint32_t mask = ~0;
 423                         uint32_t *a = (uint32_t *) &a_new->addr;
 424
 425                         mask >>= a_new->mask;
 426                         a_new->broadcast = *a | htonl(mask);
 427                 }
 428         }
 429
 430         if (node_old)
 431                 a_old = container_of(node_old, struct device_addr, node);
 432
 433         if (a_new && a_old) {
 434                 keep = true;
 435
 436                 if (a_old->flags != a_new->flags ||
 437                                 a_old->valid_until != a_new->valid_until ||
 438                                 a_old->preferred_until != a_new->preferred_until)
 439                         keep = false;
 440
 441                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 442                     a_new->broadcast != a_old->broadcast)
 443                         keep = false;
 444         }
 445
 446         if (node_old) {
 447                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 448                         interface_handle_subnet_route(iface, a_old, false);
 449
 450                         if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 451                                 v6 = true;
 452
 453                         //This is needed for source routing to work correctly. If a device
 454                         //has two connections to a network using the same subnet, adding
 455                         //only the network-rule will cause packets to be routed through the
 456                         //first matching network (source IP matches both masks).
 457                         set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
 458                                 (v6) ? 128 : 32, iface);
 459                         set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
 460                                 a_old->mask, iface);
 461
 462                         system_del_address(dev, a_old);
 463                 }
 464                 free(a_old);
 465         }
 466
 467         if (node_new) {
 468                 a_new->enabled = true;
 469                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 470                         system_add_address(dev, a_new);
 471
 472                         if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 473                                 v6 = true;
 474
 475                         set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
 476                                 (v6) ? 128 : 32, iface);
 477                         set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
 478                                 a_new->mask, iface);
 479
 480                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 481                                 interface_handle_subnet_route(iface, a_new, true);
 482                 }
 483         }
 484 }
 485
 486 static bool
 487 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 488 {
 489         if (ip->no_defaultroute && !route->mask)
 490                 return false;
 491
 492         return ip->enabled;
 493 }
 494
 495 static void
 496 interface_update_proto_route(struct vlist_tree *tree,
 497                              struct vlist_node *node_new,
 498                              struct vlist_node *node_old)
 499 {
 500         struct interface_ip_settings *ip;
 501         struct interface *iface;
 502         struct device *dev;
 503         struct device_route *route_old, *route_new;
 504         bool keep = false;
 505
 506         ip = container_of(tree, struct interface_ip_settings, route);
 507         iface = ip->iface;
 508         dev = iface->l3_dev.dev;
 509
 510         route_old = container_of(node_old, struct device_route, node);
 511         route_new = container_of(node_new, struct device_route, node);
 512
 513         if (node_old && node_new)
 514                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 515
 516         if (node_old) {
 517                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 518                         system_del_route(dev, route_old);
 519                 free(route_old);
 520         }
 521
 522         if (node_new) {
 523                 bool _enabled = enable_route(ip, route_new);
 524
 525                 if (!(route_new->flags & DEVROUTE_METRIC))
 526                         route_new->metric = iface->metric;
 527
 528                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 529                         system_add_route(dev, route_new);
 530
 531                 route_new->iface = iface;
 532                 route_new->enabled = _enabled;
 533         }
 534 }
 535
 536 static void
 537 interface_update_host_route(struct vlist_tree *tree,
 538                              struct vlist_node *node_new,
 539                              struct vlist_node *node_old)
 540 {
 541         struct interface *iface;
 542         struct device *dev;
 543         struct device_route *route_old, *route_new;
 544
 545         iface = container_of(tree, struct interface, host_routes);
 546         dev = iface->l3_dev.dev;
 547
 548         route_old = container_of(node_old, struct device_route, node);
 549         route_new = container_of(node_new, struct device_route, node);
 550
 551         if (node_old) {
 552                 system_del_route(dev, route_old);
 553                 free(route_old);
 554         }
 555
 556         if (node_new)
 557                 system_add_route(dev, route_new);
 558 }
 559
 560
 561 static void
 562 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 563                 const struct device_prefix *prefix, struct interface *iface, bool add);
 564
 565 static void interface_trigger_ula_prefix(struct interface *iface,
 566                 const struct device_prefix *prefix, bool enable)
 567 {
 568         if (prefix == ula_prefix || (prefix->addr.s6_addr[0] & 0xfe) != 0xfc)
 569                 return;
 570
 571         bool external_ula = false;
 572         struct device_prefix_assignment *ula_assign = NULL;
 573         struct device_prefix *c;
 574         list_for_each_entry(c, &prefixes, head) {
 575                 if (c != ula_prefix && (c->addr.s6_addr[0] & 0xfe) != 0xfc)
 576                         continue;
 577
 578                 struct device_prefix_assignment *a;
 579                 list_for_each_entry(a, &c->assignments, head) {
 580                         if (!strcmp(a->name, iface->name)) {
 581                                 if (c == ula_prefix)
 582                                         ula_assign = a;
 583                                 else if (a->enabled)
 584                                         external_ula = true;
 585                         }
 586                 }
 587
 588         }
 589
 590         // Remove ULA assignment if there is an externally managed ULA and vice versa
 591         if (ula_assign && ((enable && !external_ula) || (!enable && external_ula)))
 592                 interface_set_prefix_address(ula_assign, ula_prefix, iface, enable);
 593 }
 594
 595
 596 static void
 597 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 598                 const struct device_prefix *prefix, struct interface *iface, bool add)
 599 {
 600         const struct interface *uplink = prefix->iface;
 601         if (!iface->l3_dev.dev)
 602                 return;
 603
 604         struct device *l3_downlink = iface->l3_dev.dev;
 605
 606         struct device_addr addr;
 607         memset(&addr, 0, sizeof(addr));
 608         addr.addr.in6 = prefix->addr;
 609         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 610         addr.addr.in6.s6_addr[15] += 1;
 611         addr.mask = assignment->length;
 612         addr.flags = DEVADDR_INET6;
 613         addr.preferred_until = prefix->preferred_until;
 614         addr.valid_until = prefix->valid_until;
 615
 616         if (!add && assignment->enabled) {
 617                 time_t now = system_get_rtime();
 618                 addr.preferred_until = now;
 619                 if (!addr.valid_until || addr.valid_until - now > 7200)
 620                         addr.valid_until = now + 7200;
 621                 system_add_address(l3_downlink, &addr);
 622                 assignment->enabled = false;
 623
 624                 interface_trigger_ula_prefix(iface, prefix, true);
 625         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 626                 system_add_address(l3_downlink, &addr);
 627                 if (uplink && uplink->l3_dev.dev) {
 628                         int mtu = system_update_ipv6_mtu(
 629                                         uplink->l3_dev.dev, 0);
 630                         if (mtu > 0)
 631                                 system_update_ipv6_mtu(l3_downlink, mtu);
 632                 }
 633                 assignment->enabled = true;
 634
 635                 interface_trigger_ula_prefix(iface, prefix, false);
 636         }
 637 }
 638
 639 static bool interface_prefix_assign(struct list_head *list,
 640                 struct device_prefix_assignment *assign)
 641 {
 642         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 643         struct device_prefix_assignment *c;
 644         list_for_each_entry(c, list, head) {
 645                 if (assign->assigned != -1) {
 646                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 647                                 list_add_tail(&assign->head, &c->head);
 648                                 return true;
 649                         }
 650                 } else if (assign->assigned == -1) {
 651                         current = (current + asize) & (~asize);
 652                         if (current + asize < c->assigned) {
 653                                 assign->assigned = current;
 654                                 list_add_tail(&assign->head, &c->head);
 655                                 return true;
 656                         }
 657                 }
 658                 current = (c->assigned + (1 << (64 - c->length)));
 659         }
 660         return false;
 661 }
 662
 663 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 664 {
 665         struct device_prefix_assignment *c;
 666         struct interface *iface;
 667
 668         // Delete all assignments
 669         while (!list_empty(&prefix->assignments)) {
 670                 c = list_first_entry(&prefix->assignments,
 671                                 struct device_prefix_assignment, head);
 672                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 673                         interface_set_prefix_address(c, prefix, iface, false);
 674                 list_del(&c->head);
 675                 free(c);
 676         }
 677
 678         if (!setup)
 679                 return;
 680
 681         // End-of-assignment sentinel
 682         c = malloc(sizeof(*c) + 1);
 683         c->assigned = 1 << (64 - prefix->length);
 684         c->length = 64;
 685         c->name[0] = 0;
 686         list_add(&c->head, &prefix->assignments);
 687
 688         // Excluded prefix
 689         if (prefix->excl_length > 0) {
 690                 const char name[] = "!excluded";
 691                 c = malloc(sizeof(*c) + sizeof(name));
 692                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 693                                 ((1 << (64 - prefix->length)) - 1);
 694                 c->length = prefix->excl_length;
 695                 memcpy(c->name, name, sizeof(name));
 696                 list_add(&c->head, &prefix->assignments);
 697         }
 698
 699         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 700         vlist_for_each_element(&interfaces, iface, node) {
 701                 if (iface->config_ip.assignment_length < 48 ||
 702                                 iface->config_ip.assignment_length > 64)
 703                         continue;
 704
 705                 size_t namelen = strlen(iface->name) + 1;
 706                 c = malloc(sizeof(*c) + namelen);
 707                 c->length = iface->config_ip.assignment_length;
 708                 c->assigned = iface->config_ip.assignment_hint;
 709                 c->enabled = false;
 710                 memcpy(c->name, iface->name, namelen);
 711
 712                 // First process all custom assignments, put all others in later-list
 713                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 714                         if (c->assigned != -1) {
 715                                 c->assigned = -1;
 716                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 717                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 718                         }
 719                         list_add_tail(&c->head, &assign_later);
 720                 }
 721         }
 722
 723         // Then try to assign all other + failed custom assignments
 724         while (!list_empty(&assign_later)) {
 725                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 726                 list_del(&c->head);
 727
 728                 bool assigned = false;
 729                 do {
 730                         assigned = interface_prefix_assign(&prefix->assignments, c);
 731                 } while (!assigned && ++c->length <= 64);
 732
 733                 if (!assigned) {
 734                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 735                                         "of size %hhu for %s\n", c->length, c->name);
 736                         free(c);
 737                 }
 738         }
 739
 740         list_for_each_entry(c, &prefix->assignments, head)
 741                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 742                         interface_set_prefix_address(c, prefix, iface, true);
 743 }
 744
 745
 746 void interface_refresh_assignments(bool hint)
 747 {
 748         static bool refresh = false;
 749         if (!hint && refresh) {
 750                 struct device_prefix *p;
 751                 list_for_each_entry(p, &prefixes, head)
 752                         interface_update_prefix_assignments(p, true);
 753         }
 754         refresh = hint;
 755 }
 756
 757
 758 static void
 759 interface_update_prefix(struct vlist_tree *tree,
 760                              struct vlist_node *node_new,
 761                              struct vlist_node *node_old)
 762 {
 763         struct device_prefix *prefix_old, *prefix_new;
 764         prefix_old = container_of(node_old, struct device_prefix, node);
 765         prefix_new = container_of(node_new, struct device_prefix, node);
 766
 767         struct device_route route;
 768         memset(&route, 0, sizeof(route));
 769         route.flags = DEVADDR_INET6;
 770         route.metric = INT32_MAX;
 771         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 772         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 773
 774
 775         struct device_prefix_assignment *c;
 776         struct interface *iface;
 777
 778         if (node_old && node_new) {
 779                 // Move assignments and refresh addresses to update valid times
 780                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 781
 782                 list_for_each_entry(c, &prefix_new->assignments, head)
 783                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 784                                 interface_set_prefix_address(c, prefix_new, iface, true);
 785         } else if (node_new) {
 786                 // Set null-route to avoid routing loops and set routing policy
 787                 system_add_route(NULL, &route);
 788                 if (prefix_new->iface)
 789                         set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &route.addr,
 790                                         route.mask, prefix_new->iface);
 791
 792
 793                 interface_update_prefix_assignments(prefix_new, true);
 794         } else if (node_old) {
 795                 interface_update_prefix_assignments(prefix_old, false);
 796
 797                 // Remove null-route
 798                 if (prefix_old->iface)
 799                         set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &route.addr,
 800                                         route.mask, prefix_old->iface);
 801                 system_del_route(NULL, &route);
 802         }
 803
 804         if (node_old) {
 805                 list_del(&prefix_old->head);
 806                 free(prefix_old);
 807         }
 808
 809         if (node_new)
 810                 list_add(&prefix_new->head, &prefixes);
 811
 812 }
 813
 814 struct device_prefix*
 815 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 816                 uint8_t length, time_t valid_until, time_t preferred_until,
 817                 struct in6_addr *excl_addr, uint8_t excl_length)
 818 {
 819         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 820         prefix->length = length;
 821         prefix->addr = *addr;
 822         prefix->preferred_until = preferred_until;
 823         prefix->valid_until = valid_until;
 824         prefix->iface = iface;
 825         INIT_LIST_HEAD(&prefix->assignments);
 826
 827         if (excl_addr) {
 828                 prefix->excl_addr = *excl_addr;
 829                 prefix->excl_length = excl_length;
 830         }
 831
 832         if (iface)
 833                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 834         else
 835                 interface_update_prefix(NULL, &prefix->node, NULL);
 836
 837         return prefix;
 838 }
 839
 840 void
 841 interface_ip_set_ula_prefix(const char *prefix)
 842 {
 843         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 844         if (prefix)
 845                 strncpy(buf, prefix, sizeof(buf) - 1);
 846         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 847
 848         struct in6_addr addr;
 849         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 850                 if (ula_prefix) {
 851                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 852                         ula_prefix = NULL;
 853                 }
 854                 return;
 855         }
 856
 857         int length;
 858         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 859         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 860                 return;
 861
 862         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 863                         ula_prefix->length != length) {
 864                 if (ula_prefix)
 865                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 866
 867                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 868                                 0, 0, NULL, 0);
 869         }
 870 }
 871
 872 void
 873 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 874 {
 875         struct dns_server *s;
 876
 877         s = calloc(1, sizeof(*s));
 878         if (!s)
 879                 return;
 880
 881         s->af = AF_INET;
 882         if (inet_pton(s->af, str, &s->addr.in))
 883                 goto add;
 884
 885         s->af = AF_INET6;
 886         if (inet_pton(s->af, str, &s->addr.in))
 887                 goto add;
 888
 889         free(s);
 890         return;
 891
 892 add:
 893         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 894           s->af == AF_INET6 ? '6' : '4', str);
 895         vlist_simple_add(&ip->dns_servers, &s->node);
 896 }
 897
 898 void
 899 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 900 {
 901         struct blob_attr *cur;
 902         int rem;
 903
 904         blobmsg_for_each_attr(cur, list, rem) {
 905                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 906                         continue;
 907
 908                 if (!blobmsg_check_attr(cur, NULL))
 909                         continue;
 910
 911                 interface_add_dns_server(ip, blobmsg_data(cur));
 912         }
 913 }
 914
 915 static void
 916 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 917 {
 918         struct dns_search_domain *s;
 919         int len = strlen(str);
 920
 921         s = calloc(1, sizeof(*s) + len + 1);
 922         if (!s)
 923                 return;
 924
 925         D(INTERFACE, "Add DNS search domain: %s\n", str);
 926         memcpy(s->name, str, len);
 927         vlist_simple_add(&ip->dns_search, &s->node);
 928 }
 929
 930 void
 931 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 932 {
 933         struct blob_attr *cur;
 934         int rem;
 935
 936         blobmsg_for_each_attr(cur, list, rem) {
 937                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 938                         continue;
 939
 940                 if (!blobmsg_check_attr(cur, NULL))
 941                         continue;
 942
 943                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 944         }
 945 }
 946
 947 static void
 948 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 949 {
 950         struct dns_server *s;
 951         struct dns_search_domain *d;
 952         const char *str;
 953         char buf[INET6_ADDRSTRLEN];
 954
 955         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 956                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 957                 if (!str)
 958                         continue;
 959
 960                 fprintf(f, "nameserver %s\n", str);
 961         }
 962
 963         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 964                 fprintf(f, "search %s\n", d->name);
 965         }
 966 }
 967
 968 void
 969 interface_write_resolv_conf(void)
 970 {
 971         struct interface *iface;
 972         char *path = alloca(strlen(resolv_conf) + 5);
 973         FILE *f;
 974         uint32_t crcold, crcnew;
 975
 976         sprintf(path, "%s.tmp", resolv_conf);
 977         unlink(path);
 978         f = fopen(path, "w+");
 979         if (!f) {
 980                 D(INTERFACE, "Failed to open %s for writing\n", path);
 981                 return;
 982         }
 983
 984         vlist_for_each_element(&interfaces, iface, node) {
 985                 if (iface->state != IFS_UP)
 986                         continue;
 987
 988                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 989                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 990                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 991                     vlist_simple_empty(&iface->config_ip.dns_servers))
 992                         continue;
 993
 994                 fprintf(f, "# Interface %s\n", iface->name);
 995                 write_resolv_conf_entries(f, &iface->config_ip);
 996                 if (!iface->proto_ip.no_dns)
 997                         write_resolv_conf_entries(f, &iface->proto_ip);
 998         }
 999         fflush(f);
1000         rewind(f);
1001         crcnew = crc32_file(f);
1002         fclose(f);
1003
1004         crcold = crcnew + 1;
1005         f = fopen(resolv_conf, "r");
1006         if (f) {
1007                 crcold = crc32_file(f);
1008                 fclose(f);
1009         }
1010
1011         if (crcold == crcnew) {
1012                 unlink(path);
1013         } else if (rename(path, resolv_conf) < 0) {
1014                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1015                 unlink(path);
1016         }
1017 }
1018
1019 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1020 {
1021         struct device_addr *addr;
1022         struct device_route *route;
1023         struct device *dev;
1024
1025         ip->enabled = enabled;
1026         dev = ip->iface->l3_dev.dev;
1027         if (!dev)
1028                 return;
1029
1030         vlist_for_each_element(&ip->addr, addr, node) {
1031                 if (addr->enabled == enabled)
1032                         continue;
1033
1034                 if (enabled)
1035                         system_add_address(dev, addr);
1036                 else
1037                         system_del_address(dev, addr);
1038                 addr->enabled = enabled;
1039         }
1040
1041         vlist_for_each_element(&ip->route, route, node) {
1042                 bool _enabled = enabled;
1043
1044                 if (!enable_route(ip, route))
1045                         _enabled = false;
1046
1047                 if (route->enabled == _enabled)
1048                         continue;
1049
1050                 if (_enabled) {
1051                         if (!(route->flags & DEVROUTE_METRIC))
1052                                 route->metric = ip->iface->metric;
1053
1054                         system_add_route(dev, route);
1055                 } else
1056                         system_del_route(dev, route);
1057                 route->enabled = _enabled;
1058         }
1059
1060         struct device_prefix *c;
1061         struct device_prefix_assignment *a;
1062         list_for_each_entry(c, &prefixes, head)
1063                 list_for_each_entry(a, &c->assignments, head)
1064                         if (!strcmp(a->name, ip->iface->name))
1065                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1066
1067         set_ip_lo_policy(enabled, true, ip->iface);
1068         set_ip_lo_policy(enabled, false, ip->iface);
1069 }
1070
1071 void
1072 interface_ip_update_start(struct interface_ip_settings *ip)
1073 {
1074         if (ip != &ip->iface->config_ip) {
1075                 vlist_simple_update(&ip->dns_servers);
1076                 vlist_simple_update(&ip->dns_search);
1077         }
1078         vlist_update(&ip->route);
1079         vlist_update(&ip->addr);
1080         vlist_update(&ip->prefix);
1081 }
1082
1083 void
1084 interface_ip_update_complete(struct interface_ip_settings *ip)
1085 {
1086         vlist_simple_flush(&ip->dns_servers);
1087         vlist_simple_flush(&ip->dns_search);
1088         vlist_flush(&ip->route);
1089         vlist_flush(&ip->addr);
1090         vlist_flush(&ip->prefix);
1091         interface_write_resolv_conf();
1092 }
1093
1094 void
1095 interface_ip_flush(struct interface_ip_settings *ip)
1096 {
1097         if (ip == &ip->iface->proto_ip)
1098                 vlist_flush_all(&ip->iface->host_routes);
1099         vlist_simple_flush_all(&ip->dns_servers);
1100         vlist_simple_flush_all(&ip->dns_search);
1101         vlist_flush_all(&ip->route);
1102         vlist_flush_all(&ip->addr);
1103         vlist_flush_all(&ip->prefix);
1104 }
1105
1106 static void
1107 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1108 {
1109         ip->iface = iface;
1110         ip->enabled = true;
1111         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1112         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1113         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1114         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1115         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1116 }
1117
1118 void
1119 interface_ip_init(struct interface *iface)
1120 {
1121         __interface_ip_init(&iface->proto_ip, iface);
1122         __interface_ip_init(&iface->config_ip, iface);
1123         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1124
1125 }
1126
1127 static void
1128 interface_ip_valid_until_handler(struct uloop_timeout *t)
1129 {
1130         time_t now = system_get_rtime();
1131         struct interface *iface;
1132         vlist_for_each_element(&interfaces, iface, node) {
1133                 if (iface->state != IFS_UP)
1134                         continue;
1135
1136                 struct device_addr *addr, *addrp;
1137                 struct device_route *route, *routep;
1138                 struct device_prefix *pref, *prefp;
1139
1140                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1141                         if (addr->valid_until && addr->valid_until < now)
1142                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1143
1144                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1145                         if (route->valid_until && route->valid_until < now)
1146                                 vlist_delete(&iface->proto_ip.route, &route->node);
1147
1148                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1149                         if (pref->valid_until && pref->valid_until < now)
1150                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1151
1152         }
1153
1154         uloop_timeout_set(t, 1000);
1155 }
1156
1157 static void __init
1158 interface_ip_init_worker(void)
1159 {
1160         valid_until_timeout.cb = interface_ip_valid_until_handler;
1161         uloop_timeout_set(&valid_until_timeout, 1000);
1162 }