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
  19 #include <limits.h>
  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_SOURCE,
  40         __ROUTE_MAX
  41 };
  42
  43 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  44         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  45         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  46         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  47         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  48         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  49         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  50         [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
  51         [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  52         [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
  53 };
  54
  55 const struct uci_blob_param_list route_attr_list = {
  56         .n_params = __ROUTE_MAX,
  57         .params = route_attr,
  58 };
  59
  60
  61 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  62 static struct device_prefix *ula_prefix = NULL;
  63 static struct uloop_timeout valid_until_timeout;
  64
  65
  66 static void
  67 clear_if_addr(union if_addr *a, int mask)
  68 {
  69         int m_bytes = (mask + 7) / 8;
  70         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  71         uint8_t *p = (uint8_t *) a;
  72
  73         if (m_bytes < sizeof(a))
  74                 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
  75
  76         p[m_bytes - 1] &= ~m_clear;
  77 }
  78
  79 static bool
  80 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  81 {
  82         union if_addr *p1, *p2;
  83
  84         p1 = alloca(sizeof(*a1));
  85         p2 = alloca(sizeof(*a2));
  86
  87         memcpy(p1, a1, sizeof(*a1));
  88         clear_if_addr(p1, mask);
  89         memcpy(p2, a2, sizeof(*a2));
  90         clear_if_addr(p2, mask);
  91
  92         return !memcmp(p1, p2, sizeof(*p1));
  93 }
  94
  95 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
  96                 const union if_addr *addr, uint8_t mask, unsigned int table,
  97                 struct interface *in_iface, const char *action)
  98 {
  99         struct iprule rule = {
 100                 .flags = IPRULE_PRIORITY,
 101                 .priority = priority
 102         };
 103
 104         if (addr) {
 105                 rule.flags |= IPRULE_SRC;
 106                 rule.src_addr = *addr;
 107                 rule.src_mask = mask;
 108         }
 109
 110         if (table) {
 111                 rule.flags |= IPRULE_LOOKUP;
 112                 rule.lookup = table;
 113
 114                 if (!rule.lookup)
 115                         return 0;
 116         } else if (action) {
 117                 rule.flags |= IPRULE_ACTION;
 118                 system_resolve_iprule_action(action, &rule.action);
 119         }
 120
 121         if (in_iface && in_iface->l3_dev.dev) {
 122                 rule.flags |= IPRULE_IN;
 123                 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
 124         }
 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 int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
 132 {
 133         struct iprule rule = {
 134                 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
 135                 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
 136                 .lookup = (v6) ? iface->ip6table : iface->ip4table,
 137                 .in_dev = "lo"
 138         };
 139
 140         if (!rule.lookup)
 141                 return 0;
 142
 143         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 144
 145         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 146 }
 147
 148 static bool
 149 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 150 {
 151         struct device_addr *addr;
 152
 153         vlist_for_each_element(&ip->addr, addr, node) {
 154                 if (!addr->enabled)
 155                         continue;
 156
 157                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 158                         continue;
 159
 160                 // Handle offlink addresses correctly
 161                 unsigned int mask = addr->mask;
 162                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 163                                 (addr->flags & DEVADDR_OFFLINK))
 164                         mask = 128;
 165
 166                 if (!match_if_addr(&addr->addr, a, mask))
 167                         continue;
 168
 169                 return true;
 170         }
 171
 172         return false;
 173 }
 174
 175 static void
 176 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 177                        bool v6, struct device_route **res)
 178 {
 179         struct device_route *route;
 180
 181         vlist_for_each_element(&ip->route, route, node) {
 182                 if (!route->enabled)
 183                         continue;
 184
 185                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 186                         continue;
 187
 188                 if (!match_if_addr(&route->addr, a, route->mask))
 189                         continue;
 190
 191                 if (route->flags & DEVROUTE_TABLE)
 192                         continue;
 193
 194                 if (!*res || route->mask < (*res)->mask)
 195                         *res = route;
 196         }
 197 }
 198
 199 static bool
 200 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 201 {
 202         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 203                __find_ip_addr_target(&iface->config_ip, a, v6);
 204 }
 205
 206 static void
 207 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 208                                bool v6, struct device_route **route)
 209 {
 210         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 211         __find_ip_route_target(&iface->config_ip, a, v6, route);
 212 }
 213
 214 struct interface *
 215 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
 216 {
 217         struct device_route *route, *r_next = NULL;
 218         bool defaultroute_target = false;
 219         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 220
 221         route = calloc(1, sizeof(*route));
 222         if (!route)
 223                 return NULL;
 224
 225         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 226         route->mask = v6 ? 128 : 32;
 227         if (memcmp(&route->addr, addr, addrsize) == 0)
 228                 defaultroute_target = true;
 229         else
 230                 memcpy(&route->addr, addr, addrsize);
 231
 232         if (iface) {
 233                 /* look for locally addressable target first */
 234                 if (interface_ip_find_addr_target(iface, addr, v6))
 235                         goto done;
 236
 237                 /* do not stop at the first route, let the lookup compare
 238                  * masks to find the best match */
 239                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 240         } else {
 241                 vlist_for_each_element(&interfaces, iface, node) {
 242                         /* look for locally addressable target first */
 243                         if (interface_ip_find_addr_target(iface, addr, v6))
 244                                 goto done;
 245
 246                         /* do not stop at the first route, let the lookup compare
 247                          * masks to find the best match */
 248                         interface_ip_find_route_target(iface, addr, v6, &r_next);
 249                 }
 250         }
 251
 252         if (!r_next) {
 253                 free(route);
 254                 return NULL;
 255         }
 256
 257         iface = r_next->iface;
 258         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 259         route->mtu = r_next->mtu;
 260         route->metric = r_next->metric;
 261         route->table = r_next->table;
 262
 263 done:
 264         route->iface = iface;
 265         if (defaultroute_target)
 266                 free(route);
 267         else
 268                 vlist_add(&iface->host_routes, &route->node, route);
 269         return iface;
 270 }
 271
 272 void
 273 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 274 {
 275         struct interface_ip_settings *ip;
 276         struct blob_attr *tb[__ROUTE_MAX], *cur;
 277         struct device_route *route;
 278         int af = v6 ? AF_INET6 : AF_INET;
 279         bool is_proto_route = !!iface;
 280
 281         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 282
 283         if (!iface) {
 284                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 285                         return;
 286
 287                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 288                 if (!iface)
 289                         return;
 290
 291                 ip = &iface->config_ip;
 292         } else {
 293                 ip = &iface->proto_ip;
 294         }
 295
 296         route = calloc(1, sizeof(*route));
 297         if (!route)
 298                 return;
 299
 300         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 301         route->mask = v6 ? 128 : 32;
 302         if ((cur = tb[ROUTE_MASK]) != NULL) {
 303                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 304                 if (route->mask > (v6 ? 128 : 32))
 305                         goto error;
 306         }
 307
 308         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 309                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 310                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 311                         goto error;
 312                 }
 313         }
 314
 315         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 316                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 317                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 318                         goto error;
 319                 }
 320         }
 321
 322         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 323                 route->metric = blobmsg_get_u32(cur);
 324                 route->flags |= DEVROUTE_METRIC;
 325         }
 326
 327         if ((cur = tb[ROUTE_MTU]) != NULL) {
 328                 route->mtu = blobmsg_get_u32(cur);
 329                 route->flags |= DEVROUTE_MTU;
 330         }
 331
 332         // Use source-based routing
 333         if ((cur = tb[ROUTE_SOURCE]) != NULL) {
 334                 char *saveptr, *source = alloca(blobmsg_data_len(cur));
 335                 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
 336
 337                 const char *addr = strtok_r(source, "/", &saveptr);
 338                 const char *mask = strtok_r(NULL, "/", &saveptr);
 339
 340                 if (!addr || inet_pton(af, addr, &route->source) < 1) {
 341                         DPRINTF("Failed to parse route source: %s\n", addr);
 342                         goto error;
 343                 }
 344
 345                 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
 346         }
 347
 348         if (is_proto_route) {
 349                 route->table = (v6) ? iface->ip6table : iface->ip4table;
 350                 route->flags |= DEVROUTE_SRCTABLE;
 351         }
 352
 353         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 354                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 355                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 356                         goto error;
 357                 }
 358
 359                 if (route->table)
 360                         route->flags |= DEVROUTE_TABLE;
 361         }
 362
 363         if ((cur = tb[ROUTE_VALID]) != NULL) {
 364                 int64_t valid = blobmsg_get_u32(cur);
 365                 int64_t valid_until = valid + (int64_t)system_get_rtime();
 366                 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
 367                         route->valid_until = valid_until;
 368         }
 369
 370         vlist_add(&ip->route, &route->node, route);
 371         return;
 372
 373 error:
 374         free(route);
 375 }
 376
 377 static int
 378 addr_cmp(const void *k1, const void *k2, void *ptr)
 379 {
 380         return memcmp(k1, k2, sizeof(struct device_addr) -
 381                       offsetof(struct device_addr, flags));
 382 }
 383
 384 static int
 385 route_cmp(const void *k1, const void *k2, void *ptr)
 386 {
 387         const struct device_route *r1 = k1, *r2 = k2;
 388
 389         if (r1->mask != r2->mask)
 390                 return r2->mask - r1->mask;
 391
 392         if (r1->metric != r2->metric)
 393                 return r1->metric - r2->metric;
 394
 395         if (r1->flags != r2->flags)
 396                 return r2->flags - r1->flags;
 397
 398         if (r1->sourcemask != r2->sourcemask)
 399                 return r1->sourcemask - r2->sourcemask;
 400
 401         int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
 402         if (maskcmp)
 403                 return maskcmp;
 404
 405         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 406 }
 407
 408 static int
 409 prefix_cmp(const void *k1, const void *k2, void *ptr)
 410 {
 411         return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
 412                         offsetof(struct device_prefix, addr));
 413 }
 414
 415 static void
 416 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 417 {
 418         struct device *dev = iface->l3_dev.dev;
 419         struct device_route route;
 420
 421         memset(&route, 0, sizeof(route));
 422         route.iface = iface;
 423         route.flags = addr->flags;
 424         route.mask = addr->mask;
 425         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 426         clear_if_addr(&route.addr, route.mask);
 427
 428         if (add) {
 429                 route.flags |= DEVADDR_KERNEL;
 430                 system_del_route(dev, &route);
 431
 432                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 433                         route.flags &= ~DEVADDR_KERNEL;
 434                         route.metric = iface->metric;
 435                         system_add_route(dev, &route);
 436                 }
 437         } else {
 438                 if (!(addr->flags & DEVADDR_OFFLINK))
 439                         system_del_route(dev, &route);
 440         }
 441 }
 442
 443 static void
 444 interface_update_proto_addr(struct vlist_tree *tree,
 445                             struct vlist_node *node_new,
 446                             struct vlist_node *node_old)
 447 {
 448         struct interface_ip_settings *ip;
 449         struct interface *iface;
 450         struct device *dev;
 451         struct device_addr *a_new = NULL, *a_old = NULL;
 452         bool replace = false;
 453         bool keep = false;
 454         bool v6 = false;
 455
 456         ip = container_of(tree, struct interface_ip_settings, addr);
 457         iface = ip->iface;
 458         dev = iface->l3_dev.dev;
 459
 460         if (!node_new || !node_old)
 461                 iface->updated |= IUF_ADDRESS;
 462
 463         if (node_new) {
 464                 a_new = container_of(node_new, struct device_addr, node);
 465
 466                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 467                     !a_new->broadcast) {
 468
 469                         uint32_t mask = ~0;
 470                         uint32_t *a = (uint32_t *) &a_new->addr;
 471
 472                         mask >>= a_new->mask;
 473                         a_new->broadcast = *a | htonl(mask);
 474                 }
 475         }
 476
 477         if (node_old)
 478                 a_old = container_of(node_old, struct device_addr, node);
 479
 480         if (a_new && a_old) {
 481                 keep = true;
 482
 483                 if (a_old->flags != a_new->flags || a_old->failed)
 484                         keep = false;
 485
 486                 if (a_old->valid_until != a_new->valid_until ||
 487                                 a_old->preferred_until != a_new->preferred_until)
 488                         replace = true;
 489
 490                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 491                     a_new->broadcast != a_old->broadcast)
 492                         keep = false;
 493         }
 494
 495         if (node_old) {
 496                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 497                         interface_handle_subnet_route(iface, a_old, false);
 498
 499                         if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 500                                 v6 = true;
 501
 502                         unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
 503
 504                         //This is needed for source routing to work correctly. If a device
 505                         //has two connections to a network using the same subnet, adding
 506                         //only the network-rule will cause packets to be routed through the
 507                         //first matching network (source IP matches both masks).
 508                         if (table) {
 509                                 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
 510                                                 (v6) ? 128 : 32, table, NULL, NULL);
 511                                 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
 512                                                 a_old->mask, table, NULL, NULL);
 513                         }
 514
 515                         system_del_address(dev, a_old);
 516                 }
 517                 free(a_old->pclass);
 518                 free(a_old);
 519         }
 520
 521         if (node_new) {
 522                 a_new->enabled = true;
 523                 if (!(a_new->flags & DEVADDR_EXTERNAL) && (!keep || replace)) {
 524                         if (system_add_address(dev, a_new))
 525                                 a_new->failed = true;
 526
 527                         if (!keep) {
 528                                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 529                                         v6 = true;
 530
 531                                 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
 532
 533                                 if (table) {
 534                                         set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
 535                                                         (v6) ? 128 : 32, table, NULL, NULL);
 536                                         set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
 537                                                         a_new->mask, table, NULL, NULL);
 538                                 }
 539                         }
 540
 541                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 542                                 interface_handle_subnet_route(iface, a_new, true);
 543                 }
 544         }
 545 }
 546
 547 static bool
 548 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 549 {
 550         if (ip->no_defaultroute && !route->mask)
 551                 return false;
 552
 553         return ip->enabled;
 554 }
 555
 556 static void
 557 interface_update_proto_route(struct vlist_tree *tree,
 558                              struct vlist_node *node_new,
 559                              struct vlist_node *node_old)
 560 {
 561         struct interface_ip_settings *ip;
 562         struct interface *iface;
 563         struct device *dev;
 564         struct device_route *route_old, *route_new;
 565         bool keep = false;
 566
 567         ip = container_of(tree, struct interface_ip_settings, route);
 568         iface = ip->iface;
 569         dev = iface->l3_dev.dev;
 570
 571         if (!node_new || !node_old)
 572                 iface->updated |= IUF_ROUTE;
 573
 574         route_old = container_of(node_old, struct device_route, node);
 575         route_new = container_of(node_new, struct device_route, node);
 576
 577         if (node_old && node_new)
 578                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
 579                         (route_old->table == route_new->table) && !route_old->failed;
 580
 581         if (node_old) {
 582                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 583                         system_del_route(dev, route_old);
 584
 585                 free(route_old);
 586         }
 587
 588         if (node_new) {
 589                 bool _enabled = enable_route(ip, route_new);
 590
 591                 if (!(route_new->flags & DEVROUTE_METRIC))
 592                         route_new->metric = iface->metric;
 593
 594                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 595                         if (system_add_route(dev, route_new))
 596                                 route_new->failed = true;
 597
 598                 route_new->iface = iface;
 599                 route_new->enabled = _enabled;
 600         }
 601 }
 602
 603 static void
 604 interface_update_host_route(struct vlist_tree *tree,
 605                              struct vlist_node *node_new,
 606                              struct vlist_node *node_old)
 607 {
 608         struct interface *iface;
 609         struct device *dev;
 610         struct device_route *route_old, *route_new;
 611
 612         iface = container_of(tree, struct interface, host_routes);
 613         dev = iface->l3_dev.dev;
 614
 615         route_old = container_of(node_old, struct device_route, node);
 616         route_new = container_of(node_new, struct device_route, node);
 617
 618         if (node_old) {
 619                 system_del_route(dev, route_old);
 620                 free(route_old);
 621         }
 622
 623         if (node_new)
 624                 system_add_route(dev, route_new);
 625 }
 626
 627
 628 static void
 629 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 630                 const struct device_prefix *prefix, struct interface *iface, bool add)
 631 {
 632         const struct interface *uplink = prefix->iface;
 633         if (!iface->l3_dev.dev)
 634                 return;
 635
 636         struct device *l3_downlink = iface->l3_dev.dev;
 637
 638         struct device_addr addr;
 639         memset(&addr, 0, sizeof(addr));
 640         addr.addr.in6 = prefix->addr;
 641         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 642         addr.addr.in6.s6_addr[15] += 1;
 643         addr.mask = assignment->length;
 644         addr.flags = DEVADDR_INET6;
 645         addr.preferred_until = prefix->preferred_until;
 646         addr.valid_until = prefix->valid_until;
 647
 648         if (!add && assignment->enabled) {
 649                 time_t now = system_get_rtime();
 650                 addr.preferred_until = now;
 651                 if (!addr.valid_until || addr.valid_until - now > 7200)
 652                         addr.valid_until = now + 7200;
 653                 system_del_address(l3_downlink, &addr); // Work around dangling prefix routes
 654                 system_add_address(l3_downlink, &addr);
 655                 if (prefix->iface) {
 656                         if (prefix->iface->ip6table)
 657                                 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
 658                                                 addr.mask, prefix->iface->ip6table, iface, NULL);
 659
 660                         set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 661                                                         addr.mask, 0, iface, "unreachable");
 662                 }
 663
 664                 assignment->enabled = false;
 665         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 666                 system_add_address(l3_downlink, &addr);
 667                 if (prefix->iface && !assignment->enabled) {
 668                         set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 669                                         addr.mask, 0, iface, "unreachable");
 670
 671                         if (prefix->iface->ip6table)
 672                                 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
 673                                                 addr.mask, prefix->iface->ip6table, iface, NULL);
 674                 }
 675                 if (uplink && uplink->l3_dev.dev) {
 676                         int mtu = system_update_ipv6_mtu(
 677                                         uplink->l3_dev.dev, 0);
 678                         if (mtu > 0)
 679                                 system_update_ipv6_mtu(l3_downlink, mtu);
 680                 }
 681                 assignment->enabled = true;
 682         }
 683 }
 684
 685 static bool interface_prefix_assign(struct list_head *list,
 686                 struct device_prefix_assignment *assign)
 687 {
 688         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 689         struct device_prefix_assignment *c;
 690         list_for_each_entry(c, list, head) {
 691                 if (assign->assigned != -1) {
 692                         if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
 693                                 list_add_tail(&assign->head, &c->head);
 694                                 return true;
 695                         }
 696                 } else if (assign->assigned == -1) {
 697                         current = (current + asize) & (~asize);
 698                         if (current + asize < c->assigned) {
 699                                 assign->assigned = current;
 700                                 list_add_tail(&assign->head, &c->head);
 701                                 return true;
 702                         }
 703                 }
 704                 current = (c->assigned + (1 << (64 - c->length)));
 705         }
 706         return false;
 707 }
 708
 709 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 710 {
 711         struct device_prefix_assignment *c;
 712         struct interface *iface;
 713
 714         // Delete all assignments
 715         while (!list_empty(&prefix->assignments)) {
 716                 c = list_first_entry(&prefix->assignments,
 717                                 struct device_prefix_assignment, head);
 718                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 719                         interface_set_prefix_address(c, prefix, iface, false);
 720                 list_del(&c->head);
 721                 free(c);
 722         }
 723
 724         if (!setup)
 725                 return;
 726
 727         // End-of-assignment sentinel
 728         c = malloc(sizeof(*c) + 1);
 729         c->assigned = 1 << (64 - prefix->length);
 730         c->length = 64;
 731         c->name[0] = 0;
 732         list_add(&c->head, &prefix->assignments);
 733
 734         // Excluded prefix
 735         if (prefix->excl_length > 0) {
 736                 const char name[] = "!excluded";
 737                 c = malloc(sizeof(*c) + sizeof(name));
 738                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 739                                 ((1 << (64 - prefix->length)) - 1);
 740                 c->length = prefix->excl_length;
 741                 memcpy(c->name, name, sizeof(name));
 742                 list_add(&c->head, &prefix->assignments);
 743         }
 744
 745         bool assigned_any = false;
 746         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 747         vlist_for_each_element(&interfaces, iface, node) {
 748                 if (iface->assignment_length < 48 ||
 749                                 iface->assignment_length > 64)
 750                         continue;
 751
 752                 // Test whether there is a matching class
 753                 if (!list_empty(&iface->assignment_classes)) {
 754                         bool found = false;
 755
 756                         struct interface_assignment_class *c;
 757                         list_for_each_entry(c, &iface->assignment_classes, head) {
 758                                 if (!strcmp(c->name, prefix->pclass)) {
 759                                         found = true;
 760                                         break;
 761                                 }
 762                         }
 763
 764                         if (!found)
 765                                 continue;
 766                 }
 767
 768                 size_t namelen = strlen(iface->name) + 1;
 769                 c = malloc(sizeof(*c) + namelen);
 770                 c->length = iface->assignment_length;
 771                 c->assigned = iface->assignment_hint;
 772                 c->enabled = false;
 773                 memcpy(c->name, iface->name, namelen);
 774
 775                 // First process all custom assignments, put all others in later-list
 776                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 777                         if (c->assigned != -1) {
 778                                 c->assigned = -1;
 779                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 780                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 781                         }
 782
 783                         struct list_head *next = &assign_later;
 784                         struct device_prefix_assignment *n;
 785                         list_for_each_entry(n, &assign_later, head) {
 786                                 if (n->length < c->length) {
 787                                         next = &n->head;
 788                                         break;
 789                                 }
 790                         }
 791                         list_add_tail(&c->head, next);
 792                 }
 793
 794                 if (c->assigned != -1)
 795                         assigned_any = true;
 796         }
 797
 798         // Then try to assign all other + failed custom assignments
 799         while (!list_empty(&assign_later)) {
 800                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 801                 list_del(&c->head);
 802
 803                 bool assigned = false;
 804                 do {
 805                         assigned = interface_prefix_assign(&prefix->assignments, c);
 806                 } while (!assigned && ++c->length <= 64);
 807
 808                 if (!assigned) {
 809                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 810                                         "of size %hhu for %s\n", c->length, c->name);
 811                         free(c);
 812                 } else {
 813                         assigned_any = true;
 814                 }
 815         }
 816
 817         list_for_each_entry(c, &prefix->assignments, head)
 818                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 819                         interface_set_prefix_address(c, prefix, iface, true);
 820
 821         if (!assigned_any)
 822                 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
 823                                 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
 824 }
 825
 826
 827 void interface_refresh_assignments(bool hint)
 828 {
 829         static bool refresh = false;
 830         if (!hint && refresh) {
 831                 struct device_prefix *p;
 832                 list_for_each_entry(p, &prefixes, head)
 833                         interface_update_prefix_assignments(p, true);
 834         }
 835         refresh = hint;
 836 }
 837
 838
 839 static void
 840 interface_update_prefix(struct vlist_tree *tree,
 841                              struct vlist_node *node_new,
 842                              struct vlist_node *node_old)
 843 {
 844         struct device_prefix *prefix_old, *prefix_new;
 845         prefix_old = container_of(node_old, struct device_prefix, node);
 846         prefix_new = container_of(node_new, struct device_prefix, node);
 847
 848         struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
 849         if (tree && (!node_new || !node_old))
 850                 ip->iface->updated |= IUF_PREFIX;
 851
 852         struct device_route route;
 853         memset(&route, 0, sizeof(route));
 854         route.flags = DEVADDR_INET6;
 855         route.metric = INT32_MAX;
 856         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 857         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 858
 859
 860         struct device_prefix_assignment *c;
 861         struct interface *iface;
 862
 863         if (node_old && node_new) {
 864                 // Move assignments and refresh addresses to update valid times
 865                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 866
 867                 list_for_each_entry(c, &prefix_new->assignments, head)
 868                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 869                                 interface_set_prefix_address(c, prefix_new, iface, true);
 870         } else if (node_new) {
 871                 // Set null-route to avoid routing loops
 872                 system_add_route(NULL, &route);
 873
 874                 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
 875                         interface_update_prefix_assignments(prefix_new, true);
 876         } else if (node_old) {
 877                 // Remove null-route
 878                 interface_update_prefix_assignments(prefix_old, false);
 879                 system_del_route(NULL, &route);
 880         }
 881
 882         if (node_old) {
 883                 if (prefix_old->head.next)
 884                         list_del(&prefix_old->head);
 885                 free(prefix_old);
 886         }
 887
 888         if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
 889                 list_add(&prefix_new->head, &prefixes);
 890
 891 }
 892
 893 struct device_prefix*
 894 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 895                 uint8_t length, time_t valid_until, time_t preferred_until,
 896                 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
 897 {
 898         if (!pclass)
 899                 pclass = (iface) ? iface->name : "local";
 900
 901         struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
 902         prefix->length = length;
 903         prefix->addr = *addr;
 904         prefix->preferred_until = preferred_until;
 905         prefix->valid_until = valid_until;
 906         prefix->iface = iface;
 907         INIT_LIST_HEAD(&prefix->assignments);
 908
 909         if (excl_addr) {
 910                 prefix->excl_addr = *excl_addr;
 911                 prefix->excl_length = excl_length;
 912         }
 913
 914         strcpy(prefix->pclass, pclass);
 915
 916         if (iface)
 917                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 918         else
 919                 interface_update_prefix(NULL, &prefix->node, NULL);
 920
 921         return prefix;
 922 }
 923
 924 void
 925 interface_ip_set_ula_prefix(const char *prefix)
 926 {
 927         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 928         if (prefix)
 929                 strncpy(buf, prefix, sizeof(buf) - 1);
 930         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 931
 932         struct in6_addr addr;
 933         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 934                 if (ula_prefix) {
 935                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 936                         ula_prefix = NULL;
 937                 }
 938                 return;
 939         }
 940
 941         int length;
 942         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 943         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 944                 return;
 945
 946         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 947                         ula_prefix->length != length) {
 948                 if (ula_prefix)
 949                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 950
 951                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 952                                 0, 0, NULL, 0, NULL);
 953         }
 954 }
 955
 956 void
 957 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 958 {
 959         struct dns_server *s;
 960
 961         s = calloc(1, sizeof(*s));
 962         if (!s)
 963                 return;
 964
 965         s->af = AF_INET;
 966         if (inet_pton(s->af, str, &s->addr.in))
 967                 goto add;
 968
 969         s->af = AF_INET6;
 970         if (inet_pton(s->af, str, &s->addr.in))
 971                 goto add;
 972
 973         free(s);
 974         return;
 975
 976 add:
 977         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 978           s->af == AF_INET6 ? '6' : '4', str);
 979         vlist_simple_add(&ip->dns_servers, &s->node);
 980 }
 981
 982 void
 983 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 984 {
 985         struct blob_attr *cur;
 986         int rem;
 987
 988         blobmsg_for_each_attr(cur, list, rem) {
 989                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 990                         continue;
 991
 992                 if (!blobmsg_check_attr(cur, NULL))
 993                         continue;
 994
 995                 interface_add_dns_server(ip, blobmsg_data(cur));
 996         }
 997 }
 998
 999 static void
1000 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1001 {
1002         struct dns_search_domain *s;
1003         int len = strlen(str);
1004
1005         s = calloc(1, sizeof(*s) + len + 1);
1006         if (!s)
1007                 return;
1008
1009         D(INTERFACE, "Add DNS search domain: %s\n", str);
1010         memcpy(s->name, str, len);
1011         vlist_simple_add(&ip->dns_search, &s->node);
1012 }
1013
1014 void
1015 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1016 {
1017         struct blob_attr *cur;
1018         int rem;
1019
1020         blobmsg_for_each_attr(cur, list, rem) {
1021                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1022                         continue;
1023
1024                 if (!blobmsg_check_attr(cur, NULL))
1025                         continue;
1026
1027                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1028         }
1029 }
1030
1031 static void
1032 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
1033 {
1034         struct dns_server *s;
1035         struct dns_search_domain *d;
1036         const char *str;
1037         char buf[INET6_ADDRSTRLEN];
1038
1039         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1040                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1041                 if (!str)
1042                         continue;
1043
1044                 fprintf(f, "nameserver %s\n", str);
1045         }
1046
1047         vlist_simple_for_each_element(&ip->dns_search, d, node) {
1048                 fprintf(f, "search %s\n", d->name);
1049         }
1050 }
1051
1052 void
1053 interface_write_resolv_conf(void)
1054 {
1055         struct interface *iface;
1056         char *path = alloca(strlen(resolv_conf) + 5);
1057         FILE *f;
1058         uint32_t crcold, crcnew;
1059
1060         sprintf(path, "%s.tmp", resolv_conf);
1061         unlink(path);
1062         f = fopen(path, "w+");
1063         if (!f) {
1064                 D(INTERFACE, "Failed to open %s for writing\n", path);
1065                 return;
1066         }
1067
1068         vlist_for_each_element(&interfaces, iface, node) {
1069                 if (iface->state != IFS_UP)
1070                         continue;
1071
1072                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1073                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1074                         vlist_simple_empty(&iface->config_ip.dns_search) &&
1075                     vlist_simple_empty(&iface->config_ip.dns_servers))
1076                         continue;
1077
1078                 fprintf(f, "# Interface %s\n", iface->name);
1079                 write_resolv_conf_entries(f, &iface->config_ip);
1080                 if (!iface->proto_ip.no_dns)
1081                         write_resolv_conf_entries(f, &iface->proto_ip);
1082         }
1083         fflush(f);
1084         rewind(f);
1085         crcnew = crc32_file(f);
1086         fclose(f);
1087
1088         crcold = crcnew + 1;
1089         f = fopen(resolv_conf, "r");
1090         if (f) {
1091                 crcold = crc32_file(f);
1092                 fclose(f);
1093         }
1094
1095         if (crcold == crcnew) {
1096                 unlink(path);
1097         } else if (rename(path, resolv_conf) < 0) {
1098                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1099                 unlink(path);
1100         }
1101 }
1102
1103 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1104 {
1105         struct device_addr *addr;
1106         struct device_route *route;
1107         struct device *dev;
1108
1109         ip->enabled = enabled;
1110         dev = ip->iface->l3_dev.dev;
1111         if (!dev)
1112                 return;
1113
1114         vlist_for_each_element(&ip->addr, addr, node) {
1115                 if (addr->enabled == enabled)
1116                         continue;
1117
1118                 if (enabled)
1119                         system_add_address(dev, addr);
1120                 else
1121                         system_del_address(dev, addr);
1122                 addr->enabled = enabled;
1123         }
1124
1125         vlist_for_each_element(&ip->route, route, node) {
1126                 bool _enabled = enabled;
1127
1128                 if (!enable_route(ip, route))
1129                         _enabled = false;
1130
1131                 if (route->enabled == _enabled)
1132                         continue;
1133
1134                 if (_enabled) {
1135                         if (!(route->flags & DEVROUTE_METRIC))
1136                                 route->metric = ip->iface->metric;
1137
1138                         system_add_route(dev, route);
1139                 } else
1140                         system_del_route(dev, route);
1141                 route->enabled = _enabled;
1142         }
1143
1144         struct device_prefix *c;
1145         struct device_prefix_assignment *a;
1146         list_for_each_entry(c, &prefixes, head)
1147                 list_for_each_entry(a, &c->assignments, head)
1148                         if (!strcmp(a->name, ip->iface->name))
1149                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1150
1151         if (ip->iface && ip->iface->l3_dev.dev) {
1152                 set_ip_lo_policy(enabled, true, ip->iface);
1153                 set_ip_lo_policy(enabled, false, ip->iface);
1154
1155                 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1156                         NULL, 0, 0, ip->iface, "failed_policy");
1157         }
1158 }
1159
1160 void
1161 interface_ip_update_start(struct interface_ip_settings *ip)
1162 {
1163         if (ip != &ip->iface->config_ip) {
1164                 vlist_simple_update(&ip->dns_servers);
1165                 vlist_simple_update(&ip->dns_search);
1166         }
1167         vlist_update(&ip->route);
1168         vlist_update(&ip->addr);
1169         vlist_update(&ip->prefix);
1170 }
1171
1172 void
1173 interface_ip_update_complete(struct interface_ip_settings *ip)
1174 {
1175         vlist_simple_flush(&ip->dns_servers);
1176         vlist_simple_flush(&ip->dns_search);
1177         vlist_flush(&ip->route);
1178         vlist_flush(&ip->addr);
1179         vlist_flush(&ip->prefix);
1180         interface_write_resolv_conf();
1181 }
1182
1183 void
1184 interface_ip_flush(struct interface_ip_settings *ip)
1185 {
1186         if (ip == &ip->iface->proto_ip)
1187                 vlist_flush_all(&ip->iface->host_routes);
1188         vlist_simple_flush_all(&ip->dns_servers);
1189         vlist_simple_flush_all(&ip->dns_search);
1190         vlist_flush_all(&ip->route);
1191         vlist_flush_all(&ip->addr);
1192         vlist_flush_all(&ip->prefix);
1193 }
1194
1195 static void
1196 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1197 {
1198         ip->iface = iface;
1199         ip->enabled = true;
1200         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1201         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1202         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1203         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1204         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1205 }
1206
1207 void
1208 interface_ip_init(struct interface *iface)
1209 {
1210         __interface_ip_init(&iface->proto_ip, iface);
1211         __interface_ip_init(&iface->config_ip, iface);
1212         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1213
1214 }
1215
1216 static void
1217 interface_ip_valid_until_handler(struct uloop_timeout *t)
1218 {
1219         time_t now = system_get_rtime();
1220         struct interface *iface;
1221         vlist_for_each_element(&interfaces, iface, node) {
1222                 if (iface->state != IFS_UP)
1223                         continue;
1224
1225                 struct device_addr *addr, *addrp;
1226                 struct device_route *route, *routep;
1227                 struct device_prefix *pref, *prefp;
1228
1229                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1230                         if (addr->valid_until && addr->valid_until < now)
1231                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1232
1233                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1234                         if (route->valid_until && route->valid_until < now)
1235                                 vlist_delete(&iface->proto_ip.route, &route->node);
1236
1237                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1238                         if (pref->valid_until && pref->valid_until < now)
1239                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1240
1241         }
1242
1243         uloop_timeout_set(t, 1000);
1244 }
1245
1246 static void __init
1247 interface_ip_init_worker(void)
1248 {
1249         valid_until_timeout.cb = interface_ip_valid_until_handler;
1250         uloop_timeout_set(&valid_until_timeout, 1000);
1251 }