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