interface.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include "netifd.h"
  19 #include "device.h"
  20 #include "interface.h"
  21 #include "interface-ip.h"
  22 #include "proto.h"
  23 #include "ubus.h"
  24 #include "config.h"
  25 #include "system.h"
  26
  27 struct vlist_tree interfaces;
  28 static LIST_HEAD(iface_all_users);
  29 static unsigned int interface_serial = 0;
  30
  31 enum {
  32         IFACE_ATTR_IFNAME,
  33         IFACE_ATTR_PROTO,
  34         IFACE_ATTR_AUTO,
  35         IFACE_ATTR_DEFAULTROUTE,
  36         IFACE_ATTR_PEERDNS,
  37         IFACE_ATTR_DNS,
  38         IFACE_ATTR_DNS_SEARCH,
  39         IFACE_ATTR_METRIC,
  40         IFACE_ATTR_INTERFACE,
  41         IFACE_ATTR_IP6ASSIGN,
  42         IFACE_ATTR_IP6HINT,
  43         IFACE_ATTR_IP4TABLE,
  44         IFACE_ATTR_IP6TABLE,
  45         IFACE_ATTR_IP6CLASS,
  46         IFACE_ATTR_DELEGATE,
  47         IFACE_ATTR_MAX
  48 };
  49
  50 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  51         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  57         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  58         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  59         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  61         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  66 };
  67
  68 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  69         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  71 };
  72
  73 const struct uci_blob_param_list interface_attr_list = {
  74         .n_params = IFACE_ATTR_MAX,
  75         .params = iface_attrs,
  76         .info = iface_attr_info,
  77 };
  78
  79 static void
  80 interface_clear_errors(struct interface *iface)
  81 {
  82         struct interface_error *error, *tmp;
  83
  84         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  85                 list_del(&error->list);
  86                 free(error);
  87         }
  88 }
  89
  90 void interface_add_error(struct interface *iface, const char *subsystem,
  91                          const char *code, const char **data, int n_data)
  92 {
  93         struct interface_error *error;
  94         int i, len = 0;
  95         int *datalen = NULL;
  96         char *dest, *d_subsys, *d_code;
  97
  98         if (n_data) {
  99                 len = n_data * sizeof(char *);
 100                 datalen = alloca(len);
 101                 for (i = 0; i < n_data; i++) {
 102                         datalen[i] = strlen(data[i]) + 1;
 103                         len += datalen[i];
 104                 }
 105         }
 106
 107         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 108                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 109                 &d_code, code ? strlen(code) + 1 : 0);
 110         if (!error)
 111                 return;
 112
 113         list_add_tail(&error->list, &iface->errors);
 114
 115         dest = (char *) &error->data[n_data + 1];
 116         for (i = 0; i < n_data; i++) {
 117                 error->data[i] = dest;
 118                 memcpy(dest, data[i], datalen[i]);
 119                 dest += datalen[i];
 120         }
 121         error->data[n_data++] = NULL;
 122
 123         if (subsystem)
 124                 error->subsystem = strcpy(d_subsys, subsystem);
 125
 126         if (code)
 127                 error->code = strcpy(d_code, code);
 128 }
 129
 130 static void
 131 interface_data_del(struct interface *iface, struct interface_data *data)
 132 {
 133         avl_delete(&iface->data, &data->node);
 134         free(data);
 135 }
 136
 137 static void
 138 interface_data_flush(struct interface *iface)
 139 {
 140         struct interface_data *d, *tmp;
 141
 142         avl_for_each_element_safe(&iface->data, d, node, tmp)
 143                 interface_data_del(iface, d);
 144 }
 145
 146 int
 147 interface_add_data(struct interface *iface, const struct blob_attr *data)
 148 {
 149         struct interface_data *n, *o;
 150
 151         if (!blobmsg_check_attr(data, true))
 152                 return UBUS_STATUS_INVALID_ARGUMENT;
 153
 154         n = calloc(1, sizeof(*n) + blob_pad_len(data));
 155         memcpy(n->data, data, blob_pad_len(data));
 156         n->node.key = blobmsg_name(n->data);
 157
 158         o = avl_find_element(&iface->data, n->node.key, o, node);
 159         if (o)
 160                 interface_data_del(iface, o);
 161
 162         avl_insert(&iface->data, &n->node);
 163         return 0;
 164 }
 165
 166 static void
 167 interface_event(struct interface *iface, enum interface_event ev)
 168 {
 169         struct interface_user *dep, *tmp;
 170         struct device *adev = NULL;
 171
 172         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 173                 dep->cb(dep, iface, ev);
 174
 175         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 176                 dep->cb(dep, iface, ev);
 177
 178         switch (ev) {
 179         case IFEV_UP:
 180                 adev = iface->l3_dev.dev;
 181                 /* fall through */
 182         case IFEV_DOWN:
 183                 alias_notify_device(iface->name, adev);
 184                 break;
 185         default:
 186                 break;
 187         }
 188 }
 189
 190 static void
 191 interface_flush_state(struct interface *iface)
 192 {
 193         if (iface->l3_dev.dev)
 194                 device_release(&iface->l3_dev);
 195         interface_data_flush(iface);
 196 }
 197
 198 static void
 199 mark_interface_down(struct interface *iface)
 200 {
 201         enum interface_state state = iface->state;
 202
 203         iface->state = IFS_DOWN;
 204         if (state == IFS_UP)
 205                 interface_event(iface, IFEV_DOWN);
 206         interface_ip_set_enabled(&iface->config_ip, false);
 207         interface_ip_flush(&iface->proto_ip);
 208         interface_flush_state(iface);
 209         system_flush_routes();
 210 }
 211
 212 void
 213 __interface_set_down(struct interface *iface, bool force)
 214 {
 215         if (iface->state == IFS_DOWN ||
 216                 iface->state == IFS_TEARDOWN)
 217                 return;
 218
 219         if (iface->state == IFS_UP)
 220                 interface_event(iface, IFEV_DOWN);
 221         iface->state = IFS_TEARDOWN;
 222         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 223         if (force)
 224                 interface_flush_state(iface);
 225
 226         if (iface->dynamic)
 227                 vlist_delete(&interfaces, &iface->node);
 228 }
 229
 230 static void
 231 interface_cb(struct device_user *dep, enum device_event ev)
 232 {
 233         struct interface *iface;
 234         bool new_state;
 235
 236         iface = container_of(dep, struct interface, main_dev);
 237         switch (ev) {
 238         case DEV_EVENT_ADD:
 239                 new_state = true;
 240                 break;
 241         case DEV_EVENT_REMOVE:
 242                 new_state = false;
 243                 break;
 244         default:
 245                 return;
 246         }
 247
 248         interface_set_available(iface, new_state);
 249         if (!new_state && dep->dev->external)
 250                 interface_set_main_dev(iface, NULL);
 251 }
 252
 253 void
 254 interface_set_available(struct interface *iface, bool new_state)
 255 {
 256         if (iface->available == new_state)
 257                 return;
 258
 259         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 260         iface->available = new_state;
 261
 262         if (new_state) {
 263                 if (iface->autostart && !config_init)
 264                         interface_set_up(iface);
 265         } else
 266                 __interface_set_down(iface, true);
 267 }
 268
 269 void
 270 interface_add_user(struct interface_user *dep, struct interface *iface)
 271 {
 272         if (!iface) {
 273                 list_add(&dep->list, &iface_all_users);
 274                 return;
 275         }
 276
 277         dep->iface = iface;
 278         list_add(&dep->list, &iface->users);
 279         if (iface->state == IFS_UP)
 280                 dep->cb(dep, iface, IFEV_UP);
 281 }
 282
 283 void
 284 interface_remove_user(struct interface_user *dep)
 285 {
 286         list_del_init(&dep->list);
 287         dep->iface = NULL;
 288 }
 289
 290 static void
 291 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 292 {
 293         struct blob_attr *cur;
 294         int rem;
 295
 296         blobmsg_for_each_attr(cur, list, rem) {
 297                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 298                         continue;
 299
 300                 if (!blobmsg_check_attr(cur, NULL))
 301                         continue;
 302
 303                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 304                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 305                 list_add(&c->head, &iface->assignment_classes);
 306         }
 307 }
 308
 309 static void
 310 interface_clear_assignment_classes(struct interface *iface)
 311 {
 312         while (!list_empty(&iface->assignment_classes)) {
 313                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 314                                 struct interface_assignment_class, head);
 315                 list_del(&c->head);
 316                 free(c);
 317         }
 318 }
 319
 320 static void
 321 interface_merge_assignment_data(struct interface *old, struct interface *new)
 322 {
 323         bool changed = (old->assignment_hint != new->assignment_hint ||
 324                         old->assignment_length != new->assignment_length ||
 325                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 326
 327         struct interface_assignment_class *c;
 328         list_for_each_entry(c, &new->assignment_classes, head) {
 329                 // Compare list entries one-by-one to see if there was a change
 330                 if (list_empty(&old->assignment_classes)) // The new list is longer
 331                         changed = true;
 332
 333                 if (changed)
 334                         break;
 335
 336                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 337                                 struct interface_assignment_class, head);
 338
 339                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 340                         break;
 341
 342                 list_del(&c_old->head);
 343                 free(c_old);
 344         }
 345
 346         // The old list was longer than the new one or the last entry didn't match
 347         if (!list_empty(&old->assignment_classes)) {
 348                 interface_clear_assignment_classes(old);
 349                 changed = true;
 350         }
 351
 352         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 353
 354         if (changed) {
 355                 old->assignment_hint = new->assignment_hint;
 356                 old->assignment_length = new->assignment_length;
 357                 interface_refresh_assignments(true);
 358         }
 359 }
 360
 361 static void
 362 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 363 {
 364         struct interface *alias = container_of(dep, struct interface, parent_iface);
 365         struct device *dev = iface->l3_dev.dev;
 366
 367         switch (ev) {
 368         case IFEV_UP:
 369                 if (!dev)
 370                         return;
 371
 372                 interface_set_main_dev(alias, dev);
 373                 interface_set_available(alias, true);
 374                 break;
 375         case IFEV_DOWN:
 376                 interface_set_available(alias, false);
 377                 interface_set_main_dev(alias, NULL);
 378                 break;
 379         case IFEV_FREE:
 380                 interface_remove_user(dep);
 381                 break;
 382         case IFEV_RELOAD:
 383         case IFEV_UPDATE:
 384                 break;
 385         }
 386 }
 387
 388 static void
 389 interface_claim_device(struct interface *iface)
 390 {
 391         struct interface *parent;
 392         struct device *dev = NULL;
 393
 394         if (iface->parent_iface.iface)
 395                 interface_remove_user(&iface->parent_iface);
 396
 397         if (iface->parent_ifname) {
 398                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 399                 iface->parent_iface.cb = interface_alias_cb;
 400                 interface_add_user(&iface->parent_iface, parent);
 401         } else if (iface->ifname &&
 402                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 403                 dev = device_get(iface->ifname, true);
 404         }
 405
 406         if (dev)
 407                 interface_set_main_dev(iface, dev);
 408
 409         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 410                 interface_set_available(iface, true);
 411 }
 412
 413 static void
 414 interface_cleanup_state(struct interface *iface)
 415 {
 416         interface_set_available(iface, false);
 417
 418         interface_flush_state(iface);
 419         interface_clear_errors(iface);
 420         interface_set_proto_state(iface, NULL);
 421
 422         if (iface->main_dev.dev)
 423                 interface_set_main_dev(iface, NULL);
 424 }
 425
 426 static void
 427 interface_cleanup(struct interface *iface)
 428 {
 429         struct interface_user *dep, *tmp;
 430
 431         if (iface->parent_iface.iface)
 432                 interface_remove_user(&iface->parent_iface);
 433
 434         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 435                 interface_remove_user(dep);
 436
 437         interface_clear_assignment_classes(iface);
 438         interface_ip_flush(&iface->config_ip);
 439         interface_cleanup_state(iface);
 440 }
 441
 442 static void
 443 interface_do_free(struct interface *iface)
 444 {
 445         interface_event(iface, IFEV_FREE);
 446         interface_cleanup(iface);
 447         free(iface->config);
 448         netifd_ubus_remove_interface(iface);
 449         avl_delete(&interfaces.avl, &iface->node.avl);
 450         free(iface);
 451 }
 452
 453 static void
 454 interface_do_reload(struct interface *iface)
 455 {
 456         interface_event(iface, IFEV_RELOAD);
 457         interface_cleanup_state(iface);
 458         proto_init_interface(iface, iface->config);
 459         interface_claim_device(iface);
 460 }
 461
 462 static void
 463 interface_handle_config_change(struct interface *iface)
 464 {
 465         enum interface_config_state state = iface->config_state;
 466
 467         iface->config_state = IFC_NORMAL;
 468         switch(state) {
 469         case IFC_NORMAL:
 470                 break;
 471         case IFC_RELOAD:
 472                 interface_do_reload(iface);
 473                 break;
 474         case IFC_REMOVE:
 475                 interface_do_free(iface);
 476                 return;
 477         }
 478         if (iface->autostart && iface->available)
 479                 interface_set_up(iface);
 480 }
 481
 482 static void
 483 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 484 {
 485         struct interface *iface = state->iface;
 486
 487         switch (ev) {
 488         case IFPEV_UP:
 489                 if (iface->state != IFS_SETUP) {
 490                         interface_event(iface, IFEV_UPDATE);
 491                         return;
 492                 }
 493
 494                 interface_ip_set_enabled(&iface->config_ip, true);
 495                 system_flush_routes();
 496                 iface->state = IFS_UP;
 497                 iface->start_time = system_get_rtime();
 498                 interface_event(iface, IFEV_UP);
 499                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 500                 break;
 501         case IFPEV_DOWN:
 502                 if (iface->state == IFS_DOWN)
 503                         return;
 504
 505                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 506                 mark_interface_down(iface);
 507                 if (iface->main_dev.dev)
 508                         device_release(&iface->main_dev);
 509                 interface_handle_config_change(iface);
 510                 break;
 511         case IFPEV_LINK_LOST:
 512                 if (iface->state != IFS_UP)
 513                         return;
 514
 515                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 516                 mark_interface_down(iface);
 517                 iface->state = IFS_SETUP;
 518                 break;
 519         }
 520
 521         interface_write_resolv_conf();
 522 }
 523
 524 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 525 {
 526         if (iface->proto) {
 527                 iface->proto->free(iface->proto);
 528                 iface->proto = NULL;
 529         }
 530         iface->state = IFS_DOWN;
 531         iface->proto = state;
 532         if (!state)
 533                 return;
 534
 535         state->proto_event = interface_proto_cb;
 536         state->iface = iface;
 537 }
 538
 539 void
 540 interface_init(struct interface *iface, const char *name,
 541                struct blob_attr *config)
 542 {
 543         struct blob_attr *tb[IFACE_ATTR_MAX];
 544         struct blob_attr *cur;
 545         const char *proto_name = NULL;
 546
 547         strncpy(iface->name, name, sizeof(iface->name) - 1);
 548         INIT_LIST_HEAD(&iface->errors);
 549         INIT_LIST_HEAD(&iface->users);
 550         INIT_LIST_HEAD(&iface->hotplug_list);
 551         INIT_LIST_HEAD(&iface->assignment_classes);
 552         interface_ip_init(iface);
 553         avl_init(&iface->data, avl_strcmp, false, NULL);
 554         iface->config_ip.enabled = false;
 555
 556         iface->main_dev.cb = interface_cb;
 557
 558         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 559                       blob_data(config), blob_len(config));
 560
 561         if ((cur = tb[IFACE_ATTR_PROTO]))
 562                 proto_name = blobmsg_data(cur);
 563
 564         proto_attach_interface(iface, proto_name);
 565
 566         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 567         iface->proto_ip.no_defaultroute =
 568                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 569         iface->proto_ip.no_dns =
 570                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 571
 572         if ((cur = tb[IFACE_ATTR_DNS]))
 573                 interface_add_dns_server_list(&iface->config_ip, cur);
 574
 575         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 576                 interface_add_dns_search_list(&iface->config_ip, cur);
 577
 578         if ((cur = tb[IFACE_ATTR_METRIC]))
 579                 iface->metric = blobmsg_get_u32(cur);
 580
 581         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 582                 iface->assignment_length = blobmsg_get_u32(cur);
 583
 584         iface->assignment_hint = -1;
 585         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 586                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 587                                 ~((1 << (64 - iface->assignment_length)) - 1);
 588
 589         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 590                 interface_add_assignment_classes(iface, cur);
 591
 592
 593         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 594                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 595                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 596         }
 597
 598         // Set a default exteranl routing table for IPv6 to do source-based-filtering
 599         struct interface *iface_old = vlist_find(&interfaces, name, iface_old, node);
 600         if (iface_old && iface_old->ip6table > 1000 && iface_old->ip6table < 2000)
 601                 iface->ip6table = iface_old->ip6table;
 602         else
 603                 iface->ip6table = 1000 + ++interface_serial;
 604
 605         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 606                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 607                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 608         }
 609
 610         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 611
 612         iface->config_autostart = iface->autostart;
 613 }
 614
 615 void interface_set_dynamic(struct interface *iface)
 616 {
 617         iface->dynamic = true;
 618         iface->node.version = -1; // Don't delete on reload
 619 }
 620
 621 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 622 {
 623         struct blob_attr *tb[IFACE_ATTR_MAX];
 624         struct blob_attr *cur;
 625
 626         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 627                       blob_data(config), blob_len(config));
 628
 629         if (alias) {
 630                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 631                         iface->parent_ifname = blobmsg_data(cur);
 632
 633                 if (!iface->parent_ifname)
 634                         return false;
 635         } else {
 636                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 637                         iface->ifname = blobmsg_data(cur);
 638         }
 639
 640
 641         iface->config = config;
 642         vlist_add(&interfaces, &iface->node, iface->name);
 643         return true;
 644 }
 645
 646 void
 647 interface_add(struct interface *iface, struct blob_attr *config)
 648 {
 649         __interface_add(iface, config, false);
 650 }
 651
 652 bool
 653 interface_add_alias(struct interface *iface, struct blob_attr *config)
 654 {
 655         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 656                 return false;
 657
 658         return __interface_add(iface, config, true);
 659 }
 660
 661 void
 662 interface_set_l3_dev(struct interface *iface, struct device *dev)
 663 {
 664         bool enabled = iface->config_ip.enabled;
 665         bool claimed = iface->l3_dev.claimed;
 666
 667         if (iface->l3_dev.dev == dev)
 668                 return;
 669
 670         interface_ip_set_enabled(&iface->config_ip, false);
 671         interface_ip_flush(&iface->proto_ip);
 672         device_add_user(&iface->l3_dev, dev);
 673
 674         if (dev) {
 675                 if (claimed)
 676                         device_claim(&iface->l3_dev);
 677                 interface_ip_set_enabled(&iface->config_ip, enabled);
 678         }
 679 }
 680
 681 void
 682 interface_set_main_dev(struct interface *iface, struct device *dev)
 683 {
 684         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 685         bool claimed = iface->l3_dev.claimed;
 686
 687         if (iface->main_dev.dev == dev)
 688                 return;
 689
 690         if (set_l3)
 691                 interface_set_l3_dev(iface, dev);
 692
 693         device_add_user(&iface->main_dev, dev);
 694         if (!dev)
 695                 return;
 696
 697         if (claimed)
 698                 device_claim(&iface->l3_dev);
 699
 700         if (!iface->l3_dev.dev)
 701                 interface_set_l3_dev(iface, dev);
 702 }
 703
 704 int
 705 interface_remove_link(struct interface *iface, struct device *dev)
 706 {
 707         struct device *mdev = iface->main_dev.dev;
 708
 709         if (mdev && mdev->hotplug_ops)
 710                 return mdev->hotplug_ops->del(mdev, dev);
 711
 712         if (!iface->main_dev.hotplug)
 713                 return UBUS_STATUS_INVALID_ARGUMENT;
 714
 715         if (dev != iface->main_dev.dev)
 716                 return UBUS_STATUS_INVALID_ARGUMENT;
 717
 718         device_remove_user(&iface->main_dev);
 719         return 0;
 720 }
 721
 722 int
 723 interface_add_link(struct interface *iface, struct device *dev)
 724 {
 725         struct device *mdev = iface->main_dev.dev;
 726
 727         if (mdev == dev)
 728                 return 0;
 729
 730         if (iface->main_dev.hotplug)
 731                 device_remove_user(&iface->main_dev);
 732
 733         if (mdev) {
 734                 if (mdev->hotplug_ops)
 735                         return mdev->hotplug_ops->add(mdev, dev);
 736                 else
 737                         return UBUS_STATUS_NOT_SUPPORTED;
 738         }
 739
 740         interface_set_main_dev(iface, dev);
 741         iface->main_dev.hotplug = true;
 742         return 0;
 743 }
 744
 745 int
 746 interface_set_up(struct interface *iface)
 747 {
 748         int ret;
 749
 750         iface->autostart = true;
 751
 752         if (iface->state != IFS_DOWN)
 753                 return 0;
 754
 755         interface_clear_errors(iface);
 756         if (!iface->available) {
 757                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 758                 return -1;
 759         }
 760
 761         if (iface->main_dev.dev) {
 762                 ret = device_claim(&iface->main_dev);
 763                 if (ret)
 764                         return ret;
 765         }
 766
 767         iface->state = IFS_SETUP;
 768         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 769         if (ret) {
 770                 mark_interface_down(iface);
 771                 return ret;
 772         }
 773
 774         return 0;
 775 }
 776
 777 int
 778 interface_set_down(struct interface *iface)
 779 {
 780         if (!iface) {
 781                 vlist_for_each_element(&interfaces, iface, node)
 782                         __interface_set_down(iface, false);
 783         } else {
 784                 iface->autostart = false;
 785                 __interface_set_down(iface, false);
 786         }
 787
 788         return 0;
 789 }
 790
 791 void
 792 interface_start_pending(void)
 793 {
 794         struct interface *iface;
 795
 796         vlist_for_each_element(&interfaces, iface, node) {
 797                 if (iface->available && iface->autostart)
 798                         interface_set_up(iface);
 799         }
 800 }
 801
 802 static void
 803 set_config_state(struct interface *iface, enum interface_config_state s)
 804 {
 805         iface->config_state = s;
 806         if (iface->state == IFS_DOWN)
 807                 interface_handle_config_change(iface);
 808         else
 809                 __interface_set_down(iface, false);
 810 }
 811
 812 void
 813 interface_update_start(struct interface *iface)
 814 {
 815         interface_ip_update_start(&iface->proto_ip);
 816 }
 817
 818 void
 819 interface_update_complete(struct interface *iface)
 820 {
 821         interface_ip_update_complete(&iface->proto_ip);
 822 }
 823
 824 static void
 825 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 826 {
 827         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 828         vlist_simple_replace(&new->dns_search, &old->dns_search);
 829 }
 830
 831 static void
 832 interface_change_config(struct interface *if_old, struct interface *if_new)
 833 {
 834         struct blob_attr *old_config = if_old->config;
 835         bool reload = false, reload_ip = false;
 836
 837 #define FIELD_CHANGED_STR(field)                                        \
 838                 ((!!if_old->field != !!if_new->field) ||                \
 839                  (if_old->field &&                                      \
 840                   strcmp(if_old->field, if_new->field) != 0))
 841
 842         if (FIELD_CHANGED_STR(parent_ifname)) {
 843                 if (if_old->parent_iface.iface)
 844                         interface_remove_user(&if_old->parent_iface);
 845                 reload = true;
 846         }
 847
 848         if (FIELD_CHANGED_STR(ifname) ||
 849             if_old->proto_handler != if_new->proto_handler)
 850                 reload = true;
 851
 852         if (!if_old->proto_handler->config_params)
 853                 D(INTERFACE, "No config parameters for interface '%s'\n",
 854                   if_old->name);
 855         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 856                                        if_old->proto_handler->config_params))
 857                 reload = true;
 858
 859 #define UPDATE(field, __var) ({                                         \
 860                 bool __changed = (if_old->field != if_new->field);      \
 861                 if_old->field = if_new->field;                          \
 862                 __var |= __changed;                                     \
 863         })
 864
 865         if_old->config = if_new->config;
 866         if (!if_old->config_autostart && if_new->config_autostart)
 867                 if_old->autostart = true;
 868
 869         if_old->device_config = if_new->device_config;
 870         if_old->config_autostart = if_new->config_autostart;
 871         if_old->ifname = if_new->ifname;
 872         if_old->parent_ifname = if_new->parent_ifname;
 873         if_old->proto_handler = if_new->proto_handler;
 874
 875         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 876         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 877
 878         UPDATE(metric, reload_ip);
 879         UPDATE(proto_ip.no_defaultroute, reload_ip);
 880         UPDATE(ip4table, reload_ip);
 881         UPDATE(ip6table, reload_ip);
 882         interface_merge_assignment_data(if_old, if_new);
 883
 884 #undef UPDATE
 885
 886         if (reload) {
 887                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 888                   if_old->name);
 889                 interface_clear_errors(if_old);
 890                 set_config_state(if_old, IFC_RELOAD);
 891                 goto out;
 892         }
 893
 894         if (reload_ip) {
 895                 interface_ip_set_enabled(&if_old->config_ip, false);
 896                 interface_ip_set_enabled(&if_old->proto_ip, false);
 897                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 898                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 899         }
 900
 901         interface_write_resolv_conf();
 902
 903 out:
 904         if_new->config = NULL;
 905         interface_cleanup(if_new);
 906         free(old_config);
 907         free(if_new);
 908 }
 909
 910 static void
 911 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 912                  struct vlist_node *node_old)
 913 {
 914         struct interface *if_old = container_of(node_old, struct interface, node);
 915         struct interface *if_new = container_of(node_new, struct interface, node);
 916
 917         if (node_old && node_new) {
 918                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 919                 interface_change_config(if_old, if_new);
 920         } else if (node_old) {
 921                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 922                 set_config_state(if_old, IFC_REMOVE);
 923         } else if (node_new) {
 924                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 925                 proto_init_interface(if_new, if_new->config);
 926                 interface_claim_device(if_new);
 927                 netifd_ubus_add_interface(if_new);
 928         }
 929 }
 930
 931
 932 static void __init
 933 interface_init_list(void)
 934 {
 935         vlist_init(&interfaces, avl_strcmp, interface_update);
 936         interfaces.keep_old = true;
 937         interfaces.no_delete = true;
 938 }