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 #include <netinet/in.h>
  22
  23 #ifdef linux
  24 #include <netinet/ether.h>
  25 #endif
  26
  27 #include "netifd.h"
  28 #include "device.h"
  29 #include "interface.h"
  30 #include "interface-ip.h"
  31 #include "proto.h"
  32 #include "ubus.h"
  33 #include "system.h"
  34
  35 enum {
  36         ROUTE_INTERFACE,
  37         ROUTE_TARGET,
  38         ROUTE_MASK,
  39         ROUTE_GATEWAY,
  40         ROUTE_METRIC,
  41         ROUTE_MTU,
  42         ROUTE_VALID,
  43         ROUTE_TABLE,
  44         ROUTE_SOURCE,
  45         ROUTE_ONLINK,
  46         ROUTE_TYPE,
  47         ROUTE_PROTO,
  48         __ROUTE_MAX
  49 };
  50
  51 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  52         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  53         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  54         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  55         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  56         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  57         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  58         [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
  59         [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  60         [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
  61         [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
  62         [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  63         [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  64 };
  65
  66 const struct uci_blob_param_list route_attr_list = {
  67         .n_params = __ROUTE_MAX,
  68         .params = route_attr,
  69 };
  70
  71 enum {
  72         NEIGHBOR_INTERFACE,
  73         NEIGHBOR_ADDRESS,
  74         NEIGHBOR_MAC,
  75         NEIGHBOR_PROXY,
  76         NEIGHBOR_ROUTER,
  77         __NEIGHBOR_MAX
  78 };
  79
  80 static const struct blobmsg_policy neighbor_attr[__NEIGHBOR_MAX]={
  81         [NEIGHBOR_INTERFACE]= { .name = "interface", .type = BLOBMSG_TYPE_STRING},
  82         [NEIGHBOR_ADDRESS]= { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING},
  83         [NEIGHBOR_MAC]= { .name = "mac", .type = BLOBMSG_TYPE_STRING},
  84         [NEIGHBOR_PROXY]= { .name = "proxy", .type = BLOBMSG_TYPE_BOOL},
  85         [NEIGHBOR_ROUTER]= {.name = "router", .type = BLOBMSG_TYPE_BOOL},
  86 };
  87
  88 const struct uci_blob_param_list neighbor_attr_list = {
  89         .n_params = __NEIGHBOR_MAX,
  90         .params = neighbor_attr,
  91 };
  92
  93
  94 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  95 static struct device_prefix *ula_prefix = NULL;
  96 static struct uloop_timeout valid_until_timeout;
  97
  98
  99 static void
 100 clear_if_addr(union if_addr *a, int mask)
 101 {
 102         int m_bytes = (mask + 7) / 8;
 103         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
 104         uint8_t *p = (uint8_t *) a;
 105
 106         if (m_bytes < sizeof(*a))
 107                 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
 108
 109         p[m_bytes - 1] &= ~m_clear;
 110 }
 111
 112 static bool
 113 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
 114 {
 115         union if_addr *p1, *p2;
 116
 117         p1 = alloca(sizeof(*a1));
 118         p2 = alloca(sizeof(*a2));
 119
 120         memcpy(p1, a1, sizeof(*a1));
 121         clear_if_addr(p1, mask);
 122         memcpy(p2, a2, sizeof(*a2));
 123         clear_if_addr(p2, mask);
 124
 125         return !memcmp(p1, p2, sizeof(*p1));
 126 }
 127
 128 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
 129                 const union if_addr *addr, uint8_t mask, unsigned int table,
 130                 struct interface *in_iface, const char *action, bool src)
 131 {
 132         struct iprule rule = {
 133                 .flags = IPRULE_PRIORITY,
 134                 .priority = priority
 135         };
 136
 137         if (addr) {
 138                 if (src) {
 139                         rule.flags |= IPRULE_SRC;
 140                         rule.src_addr = *addr;
 141                         rule.src_mask = mask;
 142                 } else {
 143                         rule.flags |= IPRULE_DEST;
 144                         rule.dest_addr = *addr;
 145                         rule.dest_mask = mask;
 146                 }
 147         }
 148
 149         if (table) {
 150                 rule.flags |= IPRULE_LOOKUP;
 151                 rule.lookup = table;
 152
 153                 if (!rule.lookup)
 154                         return 0;
 155         } else if (action) {
 156                 rule.flags |= IPRULE_ACTION;
 157                 system_resolve_iprule_action(action, &rule.action);
 158         }
 159
 160         if (in_iface && in_iface->l3_dev.dev) {
 161                 rule.flags |= IPRULE_IN;
 162                 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
 163         }
 164
 165         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 166
 167         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 168 }
 169
 170 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
 171 {
 172         struct iprule rule = {
 173                 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
 174                 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
 175                 .lookup = (v6) ? iface->ip6table : iface->ip4table,
 176                 .in_dev = "lo"
 177         };
 178
 179         if (!rule.lookup)
 180                 return 0;
 181
 182         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 183
 184         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 185 }
 186
 187 static bool
 188 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 189 {
 190         struct device_addr *addr;
 191
 192         vlist_for_each_element(&ip->addr, addr, node) {
 193                 if (!addr->enabled)
 194                         continue;
 195
 196                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 197                         continue;
 198
 199                 if (((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
 200                                 addr->point_to_point && a->in.s_addr == addr->point_to_point)
 201                         return true;
 202
 203                 /* Handle offlink addresses correctly */
 204                 unsigned int mask = addr->mask;
 205                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 206                                 (addr->flags & DEVADDR_OFFLINK))
 207                         mask = 128;
 208
 209                 if (!match_if_addr(&addr->addr, a, mask))
 210                         continue;
 211
 212                 return true;
 213         }
 214
 215         return false;
 216 }
 217
 218 static void
 219 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 220                        bool v6, struct device_route **res)
 221 {
 222         struct device_route *route;
 223
 224         vlist_for_each_element(&ip->route, route, node) {
 225                 if (!route->enabled)
 226                         continue;
 227
 228                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 229                         continue;
 230
 231                 if (!match_if_addr(&route->addr, a, route->mask))
 232                         continue;
 233
 234                 if (route->flags & DEVROUTE_TABLE)
 235                         continue;
 236
 237                 if (!*res || route->mask > (*res)->mask)
 238                         *res = route;
 239         }
 240 }
 241
 242 static bool
 243 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 244 {
 245         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 246                __find_ip_addr_target(&iface->config_ip, a, v6);
 247 }
 248
 249 static void
 250 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 251                                bool v6, struct device_route **route)
 252 {
 253         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 254         __find_ip_route_target(&iface->config_ip, a, v6, route);
 255 }
 256
 257 struct interface *
 258 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
 259 {
 260         struct device_route *route, *r_next = NULL;
 261         bool defaultroute_target = false;
 262         union if_addr addr_zero;
 263         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 264
 265         memset(&addr_zero, 0, sizeof(addr_zero));
 266         if (memcmp(&addr_zero, addr, addrsize) == 0)
 267                 defaultroute_target = true;
 268
 269         if (iface) {
 270                 /* look for locally addressable target first */
 271                 if (interface_ip_find_addr_target(iface, addr, v6))
 272                         return iface;
 273
 274                 /* do not stop at the first route, let the lookup compare
 275                  * masks to find the best match */
 276                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 277         } else {
 278                 vlist_for_each_element(&interfaces, iface, node) {
 279                         /* look for locally addressable target first */
 280                         if (interface_ip_find_addr_target(iface, addr, v6))
 281                                 return iface;
 282
 283                         /* do not stop at the first route, let the lookup compare
 284                          * masks to find the best match */
 285                         interface_ip_find_route_target(iface, addr, v6, &r_next);
 286                 }
 287         }
 288
 289         if (!r_next)
 290                 return NULL;
 291
 292         iface = r_next->iface;
 293         if (defaultroute_target)
 294                 return iface;
 295
 296         route = calloc(1, sizeof(*route));
 297         if (!route)
 298                 return NULL;
 299
 300         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 301         route->mask = v6 ? 128 : 32;
 302         memcpy(&route->addr, addr, addrsize);
 303         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 304         route->mtu = r_next->mtu;
 305         route->metric = r_next->metric;
 306         route->table = r_next->table;
 307         route->iface = iface;
 308         vlist_add(&iface->host_routes, &route->node, route);
 309
 310         return iface;
 311 }
 312
 313 static void
 314 interface_set_route_info(struct interface *iface, struct device_route *route)
 315 {
 316         bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
 317
 318         if (!iface)
 319                 return;
 320
 321         if (!(route->flags & DEVROUTE_METRIC))
 322                 route->metric = iface->metric;
 323
 324         if (!(route->flags & DEVROUTE_TABLE)) {
 325                 route->table = (v6) ? iface->ip6table : iface->ip4table;
 326                 if (route->table)
 327                         route->flags |= DEVROUTE_SRCTABLE;
 328         }
 329 }
 330
 331 void
 332 interface_ip_add_neighbor(struct interface *iface, struct blob_attr *attr, bool v6)
 333 {
 334         struct interface_ip_settings *ip;
 335         struct blob_attr *tb[__NEIGHBOR_MAX], *cur;
 336         struct device_neighbor *neighbor;
 337         int af = v6 ? AF_INET6: AF_INET;
 338         struct ether_addr *ea;
 339
 340         blobmsg_parse(neighbor_attr, __NEIGHBOR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 341
 342         if (!iface) {
 343                 if ((cur = tb[NEIGHBOR_INTERFACE]) == NULL)
 344                         return;
 345
 346                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 347
 348                 if (!iface)
 349                         return;
 350
 351                 ip = &iface->config_ip;
 352         } else
 353                 ip = &iface->proto_ip;
 354
 355         neighbor = calloc(1,sizeof(*neighbor));
 356         if (!neighbor)
 357                 return;
 358
 359         neighbor->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 360
 361         if ((cur = tb[NEIGHBOR_ADDRESS]) != NULL){
 362                 if (!inet_pton(af, blobmsg_data(cur), &neighbor->addr))
 363                         goto error;
 364         } else
 365                 goto error;
 366
 367         if ((cur = tb[NEIGHBOR_MAC]) != NULL) {
 368                 neighbor->flags |= DEVNEIGH_MAC;
 369                 ea = ether_aton(blobmsg_data(cur));
 370                 if (!ea)
 371                         goto error;
 372
 373                 memcpy(neighbor->macaddr, ea, 6);
 374         }
 375
 376         if ((cur = tb[NEIGHBOR_PROXY]) != NULL)
 377                 neighbor->proxy = blobmsg_get_bool(cur);
 378
 379         if ((cur = tb[NEIGHBOR_ROUTER]) != NULL)
 380                 neighbor->router = blobmsg_get_bool(cur);
 381
 382         vlist_add(&ip->neighbor, &neighbor->node, neighbor);
 383         return;
 384
 385 error:
 386         free(neighbor);
 387 }
 388
 389 void
 390 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 391 {
 392         struct interface_ip_settings *ip;
 393         struct blob_attr *tb[__ROUTE_MAX], *cur;
 394         struct device_route *route;
 395         int af = v6 ? AF_INET6 : AF_INET;
 396
 397         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 398
 399         if (!iface) {
 400                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 401                         return;
 402
 403                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 404                 if (!iface)
 405                         return;
 406
 407                 ip = &iface->config_ip;
 408         } else {
 409                 ip = &iface->proto_ip;
 410         }
 411
 412         route = calloc(1, sizeof(*route));
 413         if (!route)
 414                 return;
 415
 416         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 417         route->mask = v6 ? 128 : 32;
 418         if ((cur = tb[ROUTE_MASK]) != NULL) {
 419                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 420                 if (route->mask > (v6 ? 128 : 32))
 421                         goto error;
 422         }
 423
 424         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 425                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 426                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 427                         goto error;
 428                 }
 429         }
 430
 431         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 432                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 433                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 434                         goto error;
 435                 }
 436         }
 437
 438         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 439                 route->metric = blobmsg_get_u32(cur);
 440                 route->flags |= DEVROUTE_METRIC;
 441         }
 442
 443         if ((cur = tb[ROUTE_MTU]) != NULL) {
 444                 route->mtu = blobmsg_get_u32(cur);
 445                 route->flags |= DEVROUTE_MTU;
 446         }
 447
 448         /* Use source-based routing */
 449         if ((cur = tb[ROUTE_SOURCE]) != NULL) {
 450                 char *saveptr, *source = alloca(blobmsg_data_len(cur));
 451                 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
 452
 453                 const char *addr = strtok_r(source, "/", &saveptr);
 454                 const char *mask = strtok_r(NULL, "/", &saveptr);
 455
 456                 if (!addr || inet_pton(af, addr, &route->source) < 1) {
 457                         DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
 458                         goto error;
 459                 }
 460
 461                 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
 462         }
 463
 464         if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
 465                 route->flags |= DEVROUTE_ONLINK;
 466
 467         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 468                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 469                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 470                         goto error;
 471                 }
 472
 473                 /* only set the table flag if not using the main (default) table */
 474                 if (system_is_default_rt_table(route->table))
 475                         route->table = 0;
 476
 477                 if (route->table)
 478                         route->flags |= DEVROUTE_TABLE;
 479         }
 480
 481         if ((cur = tb[ROUTE_VALID]) != NULL) {
 482                 int64_t valid = blobmsg_get_u32(cur);
 483                 int64_t valid_until = valid + (int64_t)system_get_rtime();
 484                 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
 485                         route->valid_until = valid_until;
 486         }
 487
 488         if ((cur = tb[ROUTE_TYPE]) != NULL) {
 489                 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
 490                         DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
 491                         goto error;
 492                 }
 493                 route->flags |= DEVROUTE_TYPE;
 494         }
 495
 496         if ((cur = tb[ROUTE_PROTO]) != NULL) {
 497                 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
 498                         DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
 499                         goto error;
 500                 }
 501                 route->flags |= DEVROUTE_PROTO;
 502         }
 503
 504         interface_set_route_info(iface, route);
 505         vlist_add(&ip->route, &route->node, route);
 506         return;
 507
 508 error:
 509         free(route);
 510 }
 511
 512 static int
 513 addr_cmp(const void *k1, const void *k2, void *ptr)
 514 {
 515         return memcmp(k1, k2, sizeof(struct device_addr) -
 516                       offsetof(struct device_addr, flags));
 517 }
 518
 519 static int
 520 neighbor_cmp(const void *k1, const void *k2, void *ptr)
 521 {
 522         const struct device_neighbor *n1 = k1, *n2 = k2;
 523
 524         return memcmp(&n1->addr, &n2->addr, sizeof(n2->addr));
 525 }
 526
 527 static int
 528 route_cmp(const void *k1, const void *k2, void *ptr)
 529 {
 530         const struct device_route *r1 = k1, *r2 = k2;
 531
 532         if (r1->mask != r2->mask)
 533                 return r2->mask - r1->mask;
 534
 535         if (r1->metric != r2->metric)
 536                 return r1->metric - r2->metric;
 537
 538         if (r1->flags != r2->flags)
 539                 return r2->flags - r1->flags;
 540
 541         if (r1->sourcemask != r2->sourcemask)
 542                 return r1->sourcemask - r2->sourcemask;
 543
 544         if (r1->table != r2->table)
 545                 return r1->table - r2->table;
 546
 547         int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
 548         if (maskcmp)
 549                 return maskcmp;
 550
 551         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 552 }
 553
 554 static int
 555 prefix_cmp(const void *k1, const void *k2, void *ptr)
 556 {
 557         return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
 558                         offsetof(struct device_prefix, addr));
 559 }
 560
 561 static void
 562 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 563 {
 564         struct device *dev = iface->l3_dev.dev;
 565         struct device_route *r = &addr->subnet;
 566
 567         if (addr->flags & DEVADDR_OFFLINK)
 568                 return;
 569
 570         if (!add) {
 571                 if (!addr->subnet.iface)
 572                         return;
 573
 574                 system_del_route(dev, r);
 575                 memset(r, 0, sizeof(*r));
 576                 return;
 577         }
 578
 579         r->iface = iface;
 580         r->flags = addr->flags;
 581         r->mask = addr->mask;
 582         memcpy(&r->addr, &addr->addr, sizeof(r->addr));
 583         clear_if_addr(&r->addr, r->mask);
 584
 585         if (!system_resolve_rt_proto("kernel", &r->proto))
 586                 return;
 587
 588         r->flags |= DEVROUTE_PROTO;
 589         system_del_route(dev, r);
 590
 591         r->flags &= ~DEVROUTE_PROTO;
 592         interface_set_route_info(iface, r);
 593
 594         system_add_route(dev, r);
 595 }
 596
 597 static void
 598 interface_add_addr_rules(struct device_addr *addr, bool enabled)
 599 {
 600         bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
 601
 602         set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
 603                              (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
 604                              true);
 605         set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
 606                              &addr->addr, addr->mask, addr->policy_table, NULL,
 607                              NULL, false);
 608 }
 609
 610 static void
 611 interface_update_proto_addr(struct vlist_tree *tree,
 612                             struct vlist_node *node_new,
 613                             struct vlist_node *node_old)
 614 {
 615         struct interface_ip_settings *ip;
 616         struct interface *iface;
 617         struct device *dev;
 618         struct device_addr *a_new = NULL, *a_old = NULL;
 619         bool replace = false;
 620         bool keep = false;
 621         bool v6 = false;
 622
 623         ip = container_of(tree, struct interface_ip_settings, addr);
 624         iface = ip->iface;
 625         dev = iface->l3_dev.dev;
 626
 627         if (!node_new || !node_old)
 628                 iface->updated |= IUF_ADDRESS;
 629
 630         if (node_new) {
 631                 a_new = container_of(node_new, struct device_addr, node);
 632
 633                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 634                     !a_new->broadcast) {
 635
 636                         /* /31 and /32 addressing need 255.255.255.255
 637                          * as broadcast address. */
 638                         if (a_new->mask >= 31) {
 639                                 a_new->broadcast = (uint32_t) ~0;
 640                         } else {
 641                                 uint32_t mask = ~0;
 642                                 uint32_t *a = (uint32_t *) &a_new->addr;
 643
 644                                 mask >>= a_new->mask;
 645                                 a_new->broadcast = *a | htonl(mask);
 646                         }
 647                 }
 648         }
 649
 650         if (node_old)
 651                 a_old = container_of(node_old, struct device_addr, node);
 652
 653         if (a_new && a_old) {
 654                 keep = true;
 655
 656                 if (a_old->flags != a_new->flags || a_old->failed)
 657                         keep = false;
 658
 659                 if (a_old->valid_until != a_new->valid_until ||
 660                                 a_old->preferred_until != a_new->preferred_until)
 661                         replace = true;
 662
 663                 if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
 664                      (a_new->broadcast != a_old->broadcast ||
 665                       a_new->point_to_point != a_old->point_to_point))
 666                         keep = false;
 667         }
 668
 669         if (node_old) {
 670                 if (a_old->enabled && !keep) {
 671                         /*
 672                          * This is needed for source routing to work correctly. If a device
 673                          * has two connections to a network using the same subnet, adding
 674                          * only the network-rule will cause packets to be routed through the
 675                          * first matching network (source IP matches both masks)
 676                          */
 677                         if (a_old->policy_table)
 678                                 interface_add_addr_rules(a_old, false);
 679
 680                         if (!(a_old->flags & DEVADDR_EXTERNAL)) {
 681                                 interface_handle_subnet_route(iface, a_old, false);
 682                                 system_del_address(dev, a_old);
 683                         }
 684                 }
 685                 free(a_old->pclass);
 686                 free(a_old);
 687         }
 688
 689         if (node_new) {
 690                 a_new->enabled = true;
 691
 692                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 693                                 v6 = true;
 694
 695                 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
 696
 697                 if (!keep || replace) {
 698                         if (!(a_new->flags & DEVADDR_EXTERNAL)) {
 699                                 if (system_add_address(dev, a_new))
 700                                         a_new->failed = true;
 701
 702                                 if (iface->metric || a_new->policy_table)
 703                                         interface_handle_subnet_route(iface, a_new, true);
 704                         }
 705
 706                         if (!keep) {
 707                                 if (a_new->policy_table)
 708                                         interface_add_addr_rules(a_new, true);
 709                         }
 710                 }
 711         }
 712 }
 713
 714 static bool
 715 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 716 {
 717         if (ip->no_defaultroute && !route->mask)
 718                 return false;
 719
 720         return ip->enabled;
 721 }
 722
 723 static void
 724 interface_update_proto_neighbor(struct vlist_tree *tree,
 725                                 struct vlist_node * node_new,
 726                                 struct vlist_node *node_old)
 727 {
 728         struct device *dev;
 729         struct device_neighbor *neighbor_old, *neighbor_new;
 730         struct interface_ip_settings *ip;
 731         bool keep = false;
 732
 733         ip = container_of(tree, struct interface_ip_settings, neighbor);
 734         dev = ip->iface->l3_dev.dev;
 735
 736         neighbor_old = container_of(node_old, struct device_neighbor, node);
 737         neighbor_new = container_of(node_new, struct device_neighbor, node);
 738
 739         if (node_old && node_new) {
 740                 keep = (!memcmp(neighbor_old->macaddr, neighbor_new->macaddr, sizeof(neighbor_old->macaddr)) &&
 741                         (neighbor_old->proxy == neighbor_new->proxy) &&
 742                         (neighbor_old->router == neighbor_new->router));
 743         }
 744
 745         if (node_old) {
 746                 if (!keep && neighbor_old->enabled)
 747                         system_del_neighbor(dev, neighbor_old);
 748
 749                 free(neighbor_old);
 750         }
 751
 752         if (node_new) {
 753                 if (!keep && ip->enabled)
 754                         if (system_add_neighbor(dev, neighbor_new))
 755                                 neighbor_new->failed = true;
 756
 757                 neighbor_new->enabled = ip->enabled;
 758         }
 759 }
 760
 761 static void
 762 interface_update_proto_route(struct vlist_tree *tree,
 763                              struct vlist_node *node_new,
 764                              struct vlist_node *node_old)
 765 {
 766         struct interface_ip_settings *ip;
 767         struct interface *iface;
 768         struct device *dev;
 769         struct device_route *route_old, *route_new;
 770         bool keep = false;
 771
 772         ip = container_of(tree, struct interface_ip_settings, route);
 773         iface = ip->iface;
 774         dev = iface->l3_dev.dev;
 775
 776         if (!node_new || !node_old)
 777                 iface->updated |= IUF_ROUTE;
 778
 779         route_old = container_of(node_old, struct device_route, node);
 780         route_new = container_of(node_new, struct device_route, node);
 781
 782         if (node_old && node_new)
 783                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
 784                         (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
 785                         (route_old->proto == route_new->proto) && !route_old->failed;
 786
 787         if (node_old) {
 788                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 789                         system_del_route(dev, route_old);
 790
 791                 free(route_old);
 792         }
 793
 794         if (node_new) {
 795                 bool _enabled = enable_route(ip, route_new);
 796
 797                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 798                         if (system_add_route(dev, route_new))
 799                                 route_new->failed = true;
 800
 801                 route_new->iface = iface;
 802                 route_new->enabled = _enabled;
 803         }
 804 }
 805
 806 static void
 807 interface_update_host_route(struct vlist_tree *tree,
 808                              struct vlist_node *node_new,
 809                              struct vlist_node *node_old)
 810 {
 811         struct interface *iface;
 812         struct device *dev;
 813         struct device_route *route_old, *route_new;
 814
 815         iface = container_of(tree, struct interface, host_routes);
 816         dev = iface->l3_dev.dev;
 817
 818         route_old = container_of(node_old, struct device_route, node);
 819         route_new = container_of(node_new, struct device_route, node);
 820
 821         if (node_old) {
 822                 system_del_route(dev, route_old);
 823                 free(route_old);
 824         }
 825
 826         if (node_new) {
 827                 if (system_add_route(dev, route_new))
 828                         route_new->failed = true;
 829         }
 830 }
 831
 832 static void
 833 random_ifaceid(struct in6_addr *addr)
 834 {
 835         static bool initialized = false;
 836         struct timeval t;
 837
 838         if (!initialized) {
 839                 long int seed = 0;
 840                 gettimeofday(&t, NULL);
 841                 seed = t.tv_sec ^ t.tv_usec ^ getpid();
 842                 srand48(seed);
 843                 initialized = true;
 844         }
 845         addr->s6_addr32[2] = (uint32_t)mrand48();
 846         addr->s6_addr32[3] = (uint32_t)mrand48();
 847 }
 848
 849 static bool
 850 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
 851 {
 852         struct device_settings st;
 853
 854         device_merge_settings(iface->l3_dev.dev, &st);
 855
 856         if (!(st.flags & DEV_OPT_MACADDR))
 857                 return false;
 858
 859         /* get mac address */
 860         uint8_t *ifaceid = addr->s6_addr + 8;
 861         memcpy(ifaceid, st.macaddr, 3);
 862         memcpy(ifaceid + 5, st.macaddr + 3, 3);
 863         ifaceid[3] = 0xff;
 864         ifaceid[4] = 0xfe;
 865         ifaceid[0] ^= 0x02;
 866
 867         return true;
 868 }
 869
 870 static bool
 871 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
 872 {
 873         bool ret = true;
 874
 875         /* generate new iface id */
 876         switch (iface->assignment_iface_id_selection) {
 877         case IFID_FIXED:
 878                 /* fixed */
 879                 /* copy host part from assignment_fixed_iface_id */
 880                 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
 881                 break;
 882         case IFID_RANDOM:
 883                 /* randomize last 64 bits */
 884                 random_ifaceid(addr);
 885                 break;
 886         case IFID_EUI64:
 887                 /* eui64 */
 888                 ret = eui64_ifaceid(iface, addr);
 889                 break;
 890         default:
 891                 ret = false;
 892                 break;
 893         }
 894         return ret;
 895 }
 896
 897 static void
 898 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 899                 const struct device_prefix *prefix, struct interface *iface, bool add)
 900 {
 901         const struct interface *uplink = prefix->iface;
 902         if (!iface->l3_dev.dev)
 903                 return;
 904
 905         struct device *l3_downlink = iface->l3_dev.dev;
 906
 907         struct device_addr addr;
 908         struct device_route route;
 909         memset(&addr, 0, sizeof(addr));
 910         memset(&route, 0, sizeof(route));
 911
 912         addr.addr.in6 = assignment->addr;
 913         addr.mask = assignment->length;
 914         addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
 915         addr.preferred_until = prefix->preferred_until;
 916         addr.valid_until = prefix->valid_until;
 917
 918         route.flags = DEVADDR_INET6;
 919         route.mask = addr.mask < 64 ? 64 : addr.mask;
 920         route.addr = addr.addr;
 921
 922         if (!add && assignment->enabled) {
 923                 time_t now = system_get_rtime();
 924
 925                 addr.preferred_until = now;
 926                 if (!addr.valid_until || addr.valid_until - now > 7200)
 927                         addr.valid_until = now + 7200;
 928
 929                 if (iface->ip6table)
 930                         set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
 931                                         addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
 932
 933                 if (prefix->iface) {
 934                         if (prefix->iface->ip6table)
 935                                 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
 936                                                 addr.mask, prefix->iface->ip6table, iface, NULL, true);
 937
 938                         set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 939                                                         addr.mask, 0, iface, "unreachable", true);
 940                 }
 941
 942                 clear_if_addr(&route.addr, route.mask);
 943                 interface_set_route_info(iface, &route);
 944
 945                 system_del_route(l3_downlink, &route);
 946                 system_add_address(l3_downlink, &addr);
 947
 948                 assignment->addr = in6addr_any;
 949                 assignment->enabled = false;
 950         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 951                 if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
 952                         addr.addr.in6 = prefix->addr;
 953                         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 954                         if (!generate_ifaceid(iface, &addr.addr.in6))
 955                                 return;
 956
 957                         assignment->addr = addr.addr.in6;
 958                         route.addr = addr.addr;
 959                 }
 960
 961                 if (system_add_address(l3_downlink, &addr))
 962                         return;
 963
 964                 if (!assignment->enabled) {
 965                         if (iface->ip6table)
 966                                 set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
 967                                                 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
 968
 969                         if (prefix->iface) {
 970                                 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 971                                                 addr.mask, 0, iface, "unreachable", true);
 972
 973                                 if (prefix->iface->ip6table)
 974                                         set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
 975                                                         addr.mask, prefix->iface->ip6table, iface, NULL, true);
 976                         }
 977                 }
 978
 979                 clear_if_addr(&route.addr, route.mask);
 980                 interface_set_route_info(iface, &route);
 981
 982                 system_add_route(l3_downlink, &route);
 983
 984                 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
 985                         int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
 986                         int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
 987
 988                         if (mtu > 0 && mtu_old != mtu) {
 989                                 if (system_update_ipv6_mtu(l3_downlink, mtu) < 0 && mtu < mtu_old)
 990                                         netifd_log_message(L_WARNING, "Failed to set IPv6 mtu to %d "
 991                                                         "on interface '%s'\n", mtu, iface->name);
 992                         }
 993                 }
 994
 995                 assignment->enabled = true;
 996         }
 997 }
 998
 999 static bool interface_prefix_assign(struct list_head *list,
1000                 struct device_prefix_assignment *assign)
1001 {
1002         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
1003         struct device_prefix_assignment *c;
1004         list_for_each_entry(c, list, head) {
1005                 if (assign->assigned != -1) {
1006                         if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
1007                                 list_add_tail(&assign->head, &c->head);
1008                                 return true;
1009                         }
1010                 } else if (assign->assigned == -1) {
1011                         current = (current + asize) & (~asize);
1012                         if (current + asize < c->assigned) {
1013                                 assign->assigned = current;
1014                                 list_add_tail(&assign->head, &c->head);
1015                                 return true;
1016                         }
1017                 }
1018                 current = (c->assigned + (1 << (64 - c->length)));
1019         }
1020         return false;
1021 }
1022
1023 /*
1024  * Sorting of assignment entries:
1025  * Primary on assignment length: smallest assignment first
1026  * Secondary on assignment weight: highest weight first
1027  * Finally alphabetical order of interface names
1028  */
1029 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
1030 {
1031         const struct device_prefix_assignment *a1 = k1, *a2 = k2;
1032
1033         if (a1->length != a2->length)
1034                 return a1->length - a2->length;
1035
1036         if (a1->weight != a2->weight)
1037                 return a2->weight - a1->weight;
1038
1039         return strcmp(a1->name, a2->name);
1040 }
1041
1042 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
1043 {
1044         struct device_prefix_assignment *c;
1045         struct interface *iface;
1046
1047         /* Delete all assignments */
1048         while (!list_empty(&prefix->assignments)) {
1049                 c = list_first_entry(&prefix->assignments,
1050                                 struct device_prefix_assignment, head);
1051                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1052                         interface_set_prefix_address(c, prefix, iface, false);
1053                 list_del(&c->head);
1054                 free(c);
1055         }
1056
1057         if (!setup)
1058                 return;
1059
1060         /* End-of-assignment sentinel */
1061         c = malloc(sizeof(*c) + 1);
1062         if (!c)
1063                 return;
1064
1065         c->assigned = 1 << (64 - prefix->length);
1066         c->length = 64;
1067         c->name[0] = 0;
1068         c->addr = in6addr_any;
1069         list_add(&c->head, &prefix->assignments);
1070
1071         /* Excluded prefix */
1072         if (prefix->excl_length > 0) {
1073                 const char name[] = "!excluded";
1074                 c = malloc(sizeof(*c) + sizeof(name));
1075                 if (c) {
1076                         c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
1077                                         ((1 << (64 - prefix->length)) - 1);
1078                         c->length = prefix->excl_length;
1079                         c->addr = in6addr_any;
1080                         memcpy(c->name, name, sizeof(name));
1081                         list_add(&c->head, &prefix->assignments);
1082                 }
1083         }
1084
1085         bool assigned_any = false;
1086         struct {
1087                 struct avl_node node;
1088         } *entry, *n_entry;
1089         struct avl_tree assign_later;
1090
1091         avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
1092
1093         vlist_for_each_element(&interfaces, iface, node) {
1094                 if (iface->assignment_length < 48 ||
1095                                 iface->assignment_length > 64)
1096                         continue;
1097
1098                 /* Test whether there is a matching class */
1099                 if (!list_empty(&iface->assignment_classes)) {
1100                         bool found = false;
1101
1102                         struct interface_assignment_class *c;
1103                         list_for_each_entry(c, &iface->assignment_classes, head) {
1104                                 if (!strcmp(c->name, prefix->pclass)) {
1105                                         found = true;
1106                                         break;
1107                                 }
1108                         }
1109
1110                         if (!found)
1111                                 continue;
1112                 }
1113
1114                 size_t namelen = strlen(iface->name) + 1;
1115                 c = malloc(sizeof(*c) + namelen);
1116                 if (!c)
1117                         continue;
1118
1119                 c->length = iface->assignment_length;
1120                 c->assigned = iface->assignment_hint;
1121                 c->weight = iface->assignment_weight;
1122                 c->addr = in6addr_any;
1123                 c->enabled = false;
1124                 memcpy(c->name, iface->name, namelen);
1125
1126                 /* First process all custom assignments, put all others in later-list */
1127                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
1128                         if (c->assigned != -1) {
1129                                 c->assigned = -1;
1130                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
1131                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
1132                         }
1133
1134                         entry = calloc(1, sizeof(*entry));
1135                         if (!entry) {
1136                                 free(c);
1137                                 continue;
1138                         }
1139
1140                         entry->node.key = c;
1141                         avl_insert(&assign_later, &entry->node);
1142                 }
1143
1144                 if (c->assigned != -1)
1145                         assigned_any = true;
1146         }
1147
1148         /* Then try to assign all other + failed custom assignments */
1149         avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
1150                 bool assigned = false;
1151
1152                 c = (struct device_prefix_assignment *)entry->node.key;
1153                 avl_delete(&assign_later, &entry->node);
1154
1155                 do {
1156                         assigned = interface_prefix_assign(&prefix->assignments, c);
1157                 } while (!assigned && ++c->length <= 64);
1158
1159                 if (!assigned) {
1160                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
1161                                         "of size %hhu for %s\n", c->length, c->name);
1162                         free(c);
1163                 } else
1164                         assigned_any = true;
1165
1166                 free(entry);
1167         }
1168
1169         list_for_each_entry(c, &prefix->assignments, head)
1170                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1171                         interface_set_prefix_address(c, prefix, iface, true);
1172
1173         if (!assigned_any)
1174                 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1175                                 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1176 }
1177
1178
1179 void interface_refresh_assignments(bool hint)
1180 {
1181         static bool refresh = false;
1182         if (!hint && refresh) {
1183                 struct device_prefix *p;
1184                 list_for_each_entry(p, &prefixes, head)
1185                         interface_update_prefix_assignments(p, true);
1186         }
1187         refresh = hint;
1188 }
1189
1190 void interface_update_prefix_delegation(struct interface_ip_settings *ip)
1191 {
1192         struct device_prefix *prefix;
1193
1194         vlist_for_each_element(&ip->prefix, prefix, node) {
1195                 interface_update_prefix_assignments(prefix, !ip->no_delegation);
1196
1197                 if (ip->no_delegation) {
1198                         if (prefix->head.next)
1199                                 list_del(&prefix->head);
1200                 } else
1201                         list_add(&prefix->head, &prefixes);
1202         }
1203 }
1204
1205 static void
1206 interface_update_prefix(struct vlist_tree *tree,
1207                              struct vlist_node *node_new,
1208                              struct vlist_node *node_old)
1209 {
1210         struct device_prefix *prefix_old, *prefix_new;
1211         prefix_old = container_of(node_old, struct device_prefix, node);
1212         prefix_new = container_of(node_new, struct device_prefix, node);
1213
1214         struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1215         if (tree && (!node_new || !node_old))
1216                 ip->iface->updated |= IUF_PREFIX;
1217
1218         struct device_route route;
1219         memset(&route, 0, sizeof(route));
1220         route.flags = DEVADDR_INET6;
1221         route.metric = INT32_MAX;
1222         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1223         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1224
1225
1226         struct device_prefix_assignment *c;
1227         struct interface *iface;
1228
1229         if (node_old && node_new) {
1230                 /* Move assignments and refresh addresses to update valid times */
1231                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1232
1233                 list_for_each_entry(c, &prefix_new->assignments, head)
1234                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1235                                 interface_set_prefix_address(c, prefix_new, iface, true);
1236
1237                 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1238                                 prefix_new->valid_until != prefix_old->valid_until)
1239                         ip->iface->updated |= IUF_PREFIX;
1240         } else if (node_new) {
1241                 /* Set null-route to avoid routing loops */
1242                 system_add_route(NULL, &route);
1243
1244                 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1245                         interface_update_prefix_assignments(prefix_new, true);
1246         } else if (node_old) {
1247                 /* Remove null-route */
1248                 interface_update_prefix_assignments(prefix_old, false);
1249                 system_del_route(NULL, &route);
1250         }
1251
1252         if (node_old) {
1253                 if (prefix_old->head.next)
1254                         list_del(&prefix_old->head);
1255                 free(prefix_old);
1256         }
1257
1258         if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1259                 list_add(&prefix_new->head, &prefixes);
1260
1261 }
1262
1263 struct device_prefix*
1264 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1265                 uint8_t length, time_t valid_until, time_t preferred_until,
1266                 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1267 {
1268         if (!pclass)
1269                 pclass = (iface) ? iface->name : "local";
1270
1271         struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1272         if (!prefix)
1273                 return NULL;
1274
1275         prefix->length = length;
1276         prefix->addr = *addr;
1277         prefix->preferred_until = preferred_until;
1278         prefix->valid_until = valid_until;
1279         prefix->iface = iface;
1280         INIT_LIST_HEAD(&prefix->assignments);
1281
1282         if (excl_addr) {
1283                 prefix->excl_addr = *excl_addr;
1284                 prefix->excl_length = excl_length;
1285         }
1286
1287         strcpy(prefix->pclass, pclass);
1288
1289         if (iface)
1290                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1291         else
1292                 interface_update_prefix(NULL, &prefix->node, NULL);
1293
1294         return prefix;
1295 }
1296
1297 void
1298 interface_ip_set_ula_prefix(const char *prefix)
1299 {
1300         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1301         if (prefix)
1302                 strncpy(buf, prefix, sizeof(buf) - 1);
1303         char *prefixaddr = strtok_r(buf, "/", &saveptr);
1304
1305         struct in6_addr addr;
1306         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1307                 if (ula_prefix) {
1308                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
1309                         ula_prefix = NULL;
1310                 }
1311                 return;
1312         }
1313
1314         int length;
1315         char *prefixlen = strtok_r(NULL, ",", &saveptr);
1316         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1317                 return;
1318
1319         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1320                         ula_prefix->length != length) {
1321                 if (ula_prefix)
1322                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
1323
1324                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1325                                 0, 0, NULL, 0, NULL);
1326         }
1327 }
1328
1329 static void
1330 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1331 {
1332         struct dns_server *s;
1333
1334         s = calloc(1, sizeof(*s));
1335         if (!s)
1336                 return;
1337
1338         s->af = AF_INET;
1339         if (inet_pton(s->af, str, &s->addr.in))
1340                 goto add;
1341
1342         s->af = AF_INET6;
1343         if (inet_pton(s->af, str, &s->addr.in))
1344                 goto add;
1345
1346         free(s);
1347         return;
1348
1349 add:
1350         D(INTERFACE, "Add IPv%c DNS server: %s\n",
1351           s->af == AF_INET6 ? '6' : '4', str);
1352         vlist_simple_add(&ip->dns_servers, &s->node);
1353 }
1354
1355 void
1356 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1357 {
1358         struct blob_attr *cur;
1359         int rem;
1360
1361         blobmsg_for_each_attr(cur, list, rem) {
1362                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1363                         continue;
1364
1365                 if (!blobmsg_check_attr(cur, false))
1366                         continue;
1367
1368                 interface_add_dns_server(ip, blobmsg_data(cur));
1369         }
1370 }
1371
1372 static void
1373 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1374 {
1375         struct dns_search_domain *s;
1376         int len = strlen(str);
1377
1378         s = calloc(1, sizeof(*s) + len + 1);
1379         if (!s)
1380                 return;
1381
1382         D(INTERFACE, "Add DNS search domain: %s\n", str);
1383         memcpy(s->name, str, len);
1384         vlist_simple_add(&ip->dns_search, &s->node);
1385 }
1386
1387 void
1388 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1389 {
1390         struct blob_attr *cur;
1391         int rem;
1392
1393         blobmsg_for_each_attr(cur, list, rem) {
1394                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1395                         continue;
1396
1397                 if (!blobmsg_check_attr(cur, false))
1398                         continue;
1399
1400                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1401         }
1402 }
1403
1404 static void
1405 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1406 {
1407         struct dns_server *s;
1408         struct dns_search_domain *d;
1409         const char *str;
1410         char buf[INET6_ADDRSTRLEN];
1411
1412         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1413                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1414                 if (!str)
1415                         continue;
1416
1417                 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1418                         fprintf(f, "nameserver %s%%%s\n", str, dev);
1419                 else
1420                         fprintf(f, "nameserver %s\n", str);
1421         }
1422
1423         vlist_simple_for_each_element(&ip->dns_search, d, node) {
1424                 fprintf(f, "search %s\n", d->name);
1425         }
1426 }
1427
1428 /* Sorting of interface resolver entries :               */
1429 /* Primary on interface dns_metric : lowest metric first */
1430 /* Secondary on interface metric : lowest metric first   */
1431 /* Finally alphabetical order of interface names         */
1432 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1433 {
1434         const struct interface *iface1 = k1, *iface2 = k2;
1435
1436         if (iface1->dns_metric != iface2->dns_metric)
1437                 return iface1->dns_metric - iface2->dns_metric;
1438
1439         if (iface1->metric != iface2->metric)
1440                 return iface1->metric - iface2->metric;
1441
1442         return strcmp(iface1->name, iface2->name);
1443 }
1444
1445 static void
1446 __interface_write_dns_entries(FILE *f)
1447 {
1448         struct interface *iface;
1449         struct {
1450                 struct avl_node node;
1451         } *entry, *n_entry;
1452         struct avl_tree resolv_conf_iface_entries;
1453
1454         avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1455
1456         vlist_for_each_element(&interfaces, iface, node) {
1457                 if (iface->state != IFS_UP)
1458                         continue;
1459
1460                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1461                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1462                     vlist_simple_empty(&iface->config_ip.dns_search) &&
1463                     vlist_simple_empty(&iface->config_ip.dns_servers))
1464                         continue;
1465
1466                 entry = calloc(1, sizeof(*entry));
1467                 if (!entry)
1468                         continue;
1469
1470                 entry->node.key = iface;
1471                 avl_insert(&resolv_conf_iface_entries, &entry->node);
1472         }
1473
1474         avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1475                 iface = (struct interface *)entry->node.key;
1476                 struct device *dev = iface->l3_dev.dev;
1477
1478                 fprintf(f, "# Interface %s\n", iface->name);
1479
1480                 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1481
1482                 if (!iface->proto_ip.no_dns)
1483                         write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1484         }
1485
1486         avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1487                 free(entry);
1488 }
1489
1490 void
1491 interface_write_resolv_conf(void)
1492 {
1493         char *path = alloca(strlen(resolv_conf) + 5);
1494         FILE *f;
1495         uint32_t crcold, crcnew;
1496
1497         sprintf(path, "%s.tmp", resolv_conf);
1498         unlink(path);
1499         f = fopen(path, "w+");
1500         if (!f) {
1501                 D(INTERFACE, "Failed to open %s for writing\n", path);
1502                 return;
1503         }
1504
1505         __interface_write_dns_entries(f);
1506
1507         fflush(f);
1508         rewind(f);
1509         crcnew = crc32_file(f);
1510         fclose(f);
1511
1512         crcold = crcnew + 1;
1513         f = fopen(resolv_conf, "r");
1514         if (f) {
1515                 crcold = crc32_file(f);
1516                 fclose(f);
1517         }
1518
1519         if (crcold == crcnew) {
1520                 unlink(path);
1521         } else if (rename(path, resolv_conf) < 0) {
1522                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1523                 unlink(path);
1524         }
1525 }
1526
1527 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1528 {
1529         struct device_addr *addr;
1530         struct device_route *route;
1531         struct device_neighbor *neighbor;
1532         struct device *dev;
1533         struct interface *iface;
1534
1535         ip->enabled = enabled;
1536         iface = ip->iface;
1537         dev = iface->l3_dev.dev;
1538         if (!dev)
1539                 return;
1540
1541         vlist_for_each_element(&ip->addr, addr, node) {
1542                 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1543
1544                 if (addr->flags & DEVADDR_EXTERNAL)
1545                         continue;
1546
1547                 if (addr->enabled == enabled)
1548                         continue;
1549
1550                 if (enabled) {
1551                         system_add_address(dev, addr);
1552
1553                         addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1554                         if (iface->metric || addr->policy_table)
1555                                 interface_handle_subnet_route(iface, addr, true);
1556
1557                         if (addr->policy_table)
1558                                 interface_add_addr_rules(addr, true);
1559                 } else {
1560                         interface_handle_subnet_route(iface, addr, false);
1561                         system_del_address(dev, addr);
1562
1563                         if (addr->policy_table)
1564                                 interface_add_addr_rules(addr, false);
1565                 }
1566                 addr->enabled = enabled;
1567         }
1568
1569         vlist_for_each_element(&ip->route, route, node) {
1570                 bool _enabled = enabled;
1571
1572                 if (route->flags & DEVADDR_EXTERNAL)
1573                         continue;
1574
1575                 if (!enable_route(ip, route))
1576                         _enabled = false;
1577                 if (route->enabled == _enabled)
1578                         continue;
1579
1580                 if (_enabled) {
1581                         interface_set_route_info(ip->iface, route);
1582
1583                         if (system_add_route(dev, route))
1584                                 route->failed = true;
1585                 } else
1586                         system_del_route(dev, route);
1587                 route->enabled = _enabled;
1588         }
1589
1590         vlist_for_each_element(&ip->neighbor, neighbor, node) {
1591                 if (neighbor->enabled == enabled)
1592                         continue;
1593
1594                 if (enabled) {
1595                         if(system_add_neighbor(dev, neighbor))
1596                                 neighbor->failed = true;
1597                 } else
1598                         system_del_neighbor(dev, neighbor);
1599
1600                 neighbor->enabled = enabled;
1601         }
1602
1603         struct device_prefix *c;
1604         struct device_prefix_assignment *a;
1605         list_for_each_entry(c, &prefixes, head)
1606                 list_for_each_entry(a, &c->assignments, head)
1607                         if (!strcmp(a->name, ip->iface->name))
1608                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1609
1610         if (ip->iface->policy_rules_set != enabled &&
1611             ip->iface->l3_dev.dev) {
1612                 set_ip_lo_policy(enabled, true, ip->iface);
1613                 set_ip_lo_policy(enabled, false, ip->iface);
1614
1615                 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1616                         NULL, 0, 0, ip->iface, "failed_policy", true);
1617                 ip->iface->policy_rules_set = enabled;
1618         }
1619 }
1620
1621 void
1622 interface_ip_update_start(struct interface_ip_settings *ip)
1623 {
1624         if (ip != &ip->iface->config_ip) {
1625                 vlist_simple_update(&ip->dns_servers);
1626                 vlist_simple_update(&ip->dns_search);
1627         }
1628         vlist_update(&ip->route);
1629         vlist_update(&ip->addr);
1630         vlist_update(&ip->prefix);
1631         vlist_update(&ip->neighbor);
1632 }
1633
1634 void
1635 interface_ip_update_complete(struct interface_ip_settings *ip)
1636 {
1637         vlist_simple_flush(&ip->dns_servers);
1638         vlist_simple_flush(&ip->dns_search);
1639         vlist_flush(&ip->route);
1640         vlist_flush(&ip->addr);
1641         vlist_flush(&ip->prefix);
1642         vlist_flush(&ip->neighbor);
1643         interface_write_resolv_conf();
1644 }
1645
1646 void
1647 interface_ip_flush(struct interface_ip_settings *ip)
1648 {
1649         if (ip == &ip->iface->proto_ip)
1650                 vlist_flush_all(&ip->iface->host_routes);
1651         vlist_simple_flush_all(&ip->dns_servers);
1652         vlist_simple_flush_all(&ip->dns_search);
1653         vlist_flush_all(&ip->route);
1654         vlist_flush_all(&ip->addr);
1655         vlist_flush_all(&ip->neighbor);
1656         vlist_flush_all(&ip->prefix);
1657 }
1658
1659 static void
1660 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1661 {
1662         ip->iface = iface;
1663         ip->enabled = true;
1664         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1665         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1666         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1667         vlist_init(&ip->neighbor, neighbor_cmp, interface_update_proto_neighbor);
1668         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1669         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1670 }
1671
1672 void
1673 interface_ip_init(struct interface *iface)
1674 {
1675         __interface_ip_init(&iface->proto_ip, iface);
1676         __interface_ip_init(&iface->config_ip, iface);
1677         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1678 }
1679
1680 static void
1681 interface_ip_valid_until_handler(struct uloop_timeout *t)
1682 {
1683         time_t now = system_get_rtime();
1684         struct interface *iface;
1685         vlist_for_each_element(&interfaces, iface, node) {
1686                 if (iface->state != IFS_UP)
1687                         continue;
1688
1689                 struct device_addr *addr, *addrp;
1690                 struct device_route *route, *routep;
1691                 struct device_prefix *pref, *prefp;
1692
1693                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1694                         if (addr->valid_until && addr->valid_until < now)
1695                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1696
1697                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1698                         if (route->valid_until && route->valid_until < now)
1699                                 vlist_delete(&iface->proto_ip.route, &route->node);
1700
1701                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1702                         if (pref->valid_until && pref->valid_until < now)
1703                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1704
1705         }
1706
1707         uloop_timeout_set(t, 1000);
1708 }
1709
1710 static void __init
1711 interface_ip_init_worker(void)
1712 {
1713         valid_until_timeout.cb = interface_ip_valid_until_handler;
1714         uloop_timeout_set(&valid_until_timeout, 1000);
1715 }