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
  30 enum {
  31         IFACE_ATTR_IFNAME,
  32         IFACE_ATTR_PROTO,
  33         IFACE_ATTR_AUTO,
  34         IFACE_ATTR_DEFAULTROUTE,
  35         IFACE_ATTR_PEERDNS,
  36         IFACE_ATTR_DNS,
  37         IFACE_ATTR_DNS_SEARCH,
  38         IFACE_ATTR_METRIC,
  39         IFACE_ATTR_INTERFACE,
  40         IFACE_ATTR_IP6ASSIGN,
  41         IFACE_ATTR_IP6HINT,
  42         IFACE_ATTR_IP4TABLE,
  43         IFACE_ATTR_IP6TABLE,
  44         IFACE_ATTR_IP6CLASS,
  45         IFACE_ATTR_DELEGATE,
  46         IFACE_ATTR_IP6IFACEID,
  47         IFACE_ATTR_FORCE_LINK,
  48         IFACE_ATTR_MAX
  49 };
  50
  51 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  52         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  54         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  57         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  58         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  59         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  60         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  62         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  66         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  67         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  69 };
  70
  71 const struct uci_blob_param_list interface_attr_list = {
  72         .n_params = IFACE_ATTR_MAX,
  73         .params = iface_attrs,
  74 };
  75
  76 static void
  77 set_config_state(struct interface *iface, enum interface_config_state s);
  78
  79 static void
  80 interface_error_flush(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 static void
  91 interface_clear_errors(struct interface *iface)
  92 {
  93         /* don't flush the errors in case the configured protocol handler matches the
  94            running protocol handler and is having the last error capability */
  95         if (!(iface->proto &&
  96               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
  97               (iface->proto->handler->name == iface->proto_handler->name)))
  98                 interface_error_flush(iface);
  99 }
 100
 101 void interface_add_error(struct interface *iface, const char *subsystem,
 102                          const char *code, const char **data, int n_data)
 103 {
 104         struct interface_error *error;
 105         int i, len = 0;
 106         int *datalen = NULL;
 107         char *dest, *d_subsys, *d_code;
 108
 109         /* if the configured protocol handler has the last error support capability,
 110            errors should only be added if the running protocol handler matches the
 111            configured one */
 112         if (iface->proto &&
 113             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 114             (iface->proto->handler->name != iface->proto_handler->name))
 115                 return;
 116
 117         if (n_data) {
 118                 len = n_data * sizeof(char *);
 119                 datalen = alloca(len);
 120                 for (i = 0; i < n_data; i++) {
 121                         datalen[i] = strlen(data[i]) + 1;
 122                         len += datalen[i];
 123                 }
 124         }
 125
 126         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 127                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 128                 &d_code, code ? strlen(code) + 1 : 0);
 129         if (!error)
 130                 return;
 131
 132         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 133            protocol can't be established (e.g auth failure) */
 134         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 135                 interface_error_flush(iface);
 136
 137         list_add_tail(&error->list, &iface->errors);
 138
 139         dest = (char *) &error->data[n_data + 1];
 140         for (i = 0; i < n_data; i++) {
 141                 error->data[i] = dest;
 142                 memcpy(dest, data[i], datalen[i]);
 143                 dest += datalen[i];
 144         }
 145         error->data[n_data] = NULL;
 146
 147         if (subsystem)
 148                 error->subsystem = strcpy(d_subsys, subsystem);
 149
 150         if (code)
 151                 error->code = strcpy(d_code, code);
 152 }
 153
 154 static void
 155 interface_data_del(struct interface *iface, struct interface_data *data)
 156 {
 157         avl_delete(&iface->data, &data->node);
 158         free(data);
 159 }
 160
 161 static void
 162 interface_data_flush(struct interface *iface)
 163 {
 164         struct interface_data *d, *tmp;
 165
 166         avl_for_each_element_safe(&iface->data, d, node, tmp)
 167                 interface_data_del(iface, d);
 168 }
 169
 170 int
 171 interface_add_data(struct interface *iface, const struct blob_attr *data)
 172 {
 173         struct interface_data *n, *o;
 174
 175         if (!blobmsg_check_attr(data, true))
 176                 return UBUS_STATUS_INVALID_ARGUMENT;
 177
 178         const char *name = blobmsg_name(data);
 179         unsigned len = blob_pad_len(data);
 180
 181         o = avl_find_element(&iface->data, name, o, node);
 182         if (o) {
 183                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 184                         return 0;
 185
 186                 interface_data_del(iface, o);
 187         }
 188
 189         n = calloc(1, sizeof(*n) + len);
 190         memcpy(n->data, data, len);
 191         n->node.key = blobmsg_name(n->data);
 192         avl_insert(&iface->data, &n->node);
 193
 194         iface->updated |= IUF_DATA;
 195         return 0;
 196 }
 197
 198 static void
 199 interface_event(struct interface *iface, enum interface_event ev)
 200 {
 201         struct interface_user *dep, *tmp;
 202         struct device *adev = NULL;
 203
 204         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 205                 dep->cb(dep, iface, ev);
 206
 207         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 208                 dep->cb(dep, iface, ev);
 209
 210         switch (ev) {
 211         case IFEV_UP:
 212                 interface_error_flush(iface);
 213                 adev = iface->l3_dev.dev;
 214                 /* fall through */
 215         case IFEV_DOWN:
 216                 alias_notify_device(iface->name, adev);
 217                 break;
 218         default:
 219                 break;
 220         }
 221 }
 222
 223 static void
 224 interface_flush_state(struct interface *iface)
 225 {
 226         if (iface->l3_dev.dev)
 227                 device_release(&iface->l3_dev);
 228         interface_data_flush(iface);
 229 }
 230
 231 static void
 232 mark_interface_down(struct interface *iface)
 233 {
 234         enum interface_state state = iface->state;
 235
 236         if (state == IFS_DOWN)
 237                 return;
 238
 239         iface->state = IFS_DOWN;
 240         if (state == IFS_UP)
 241                 interface_event(iface, IFEV_DOWN);
 242         interface_ip_set_enabled(&iface->config_ip, false);
 243         interface_ip_set_enabled(&iface->proto_ip, false);
 244         interface_ip_flush(&iface->proto_ip);
 245         interface_flush_state(iface);
 246         system_flush_routes();
 247 }
 248
 249 void
 250 __interface_set_down(struct interface *iface, bool force)
 251 {
 252         enum interface_state state = iface->state;
 253         switch (state) {
 254         case IFS_UP:
 255         case IFS_SETUP:
 256                 iface->state = IFS_TEARDOWN;
 257                 if (state == IFS_UP)
 258                         interface_event(iface, IFEV_DOWN);
 259
 260                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 261                 if (force)
 262                         interface_flush_state(iface);
 263                 break;
 264
 265         case IFS_DOWN:
 266                 if (iface->main_dev.dev)
 267                         device_release(&iface->main_dev);
 268         case IFS_TEARDOWN:
 269         default:
 270                 break;
 271         }
 272 }
 273
 274 static int
 275 __interface_set_up(struct interface *iface)
 276 {
 277         int ret;
 278
 279         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 280
 281         iface->state = IFS_SETUP;
 282         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 283         if (ret)
 284                 mark_interface_down(iface);
 285
 286         return ret;
 287 }
 288
 289 static void
 290 interface_check_state(struct interface *iface)
 291 {
 292         bool link_state = iface->link_state || iface->force_link;
 293
 294         switch (iface->state) {
 295         case IFS_UP:
 296         case IFS_SETUP:
 297                 if (!iface->enabled || !link_state) {
 298                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 299                         mark_interface_down(iface);
 300                 }
 301                 break;
 302         case IFS_DOWN:
 303                 if (!iface->available)
 304                         return;
 305
 306                 if (iface->autostart && iface->enabled && link_state && !config_init)
 307                         __interface_set_up(iface);
 308                 break;
 309         default:
 310                 break;
 311         }
 312 }
 313
 314 static void
 315 interface_set_enabled(struct interface *iface, bool new_state)
 316 {
 317         if (iface->enabled == new_state)
 318                 return;
 319
 320         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 321         iface->enabled = new_state;
 322         interface_check_state(iface);
 323 }
 324
 325 static void
 326 interface_set_link_state(struct interface *iface, bool new_state)
 327 {
 328         if (iface->link_state == new_state)
 329                 return;
 330
 331         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 332         iface->link_state = new_state;
 333         interface_check_state(iface);
 334 }
 335
 336 static void
 337 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 338 {
 339         if (ev == DEV_EVENT_REMOVE)
 340                 device_remove_user(dep);
 341 }
 342
 343 static void
 344 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 345 {
 346         struct interface *iface;
 347         bool new_state = false;
 348
 349         iface = container_of(dep, struct interface, main_dev);
 350         switch (ev) {
 351         case DEV_EVENT_ADD:
 352                 new_state = true;
 353         case DEV_EVENT_REMOVE:
 354                 interface_set_available(iface, new_state);
 355                 if (!new_state && dep->dev && dep->dev->external)
 356                         interface_set_main_dev(iface, NULL);
 357                 break;
 358         case DEV_EVENT_UP:
 359                 new_state = true;
 360         case DEV_EVENT_DOWN:
 361                 interface_set_enabled(iface, new_state);
 362                 break;
 363         case DEV_EVENT_LINK_UP:
 364                 new_state = true;
 365         case DEV_EVENT_LINK_DOWN:
 366                 interface_set_link_state(iface, new_state);
 367                 break;
 368         case DEV_EVENT_TOPO_CHANGE:
 369                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 370                 return;
 371         default:
 372                 break;
 373         }
 374 }
 375
 376 static void
 377 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 378 {
 379         struct interface *iface;
 380
 381         iface = container_of(dep, struct interface, l3_dev);
 382         if (iface->l3_dev.dev == iface->main_dev.dev)
 383                 return;
 384
 385         switch (ev) {
 386         case DEV_EVENT_LINK_DOWN:
 387                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 388                 break;
 389         default:
 390                 break;
 391         }
 392 }
 393
 394 void
 395 interface_set_available(struct interface *iface, bool new_state)
 396 {
 397         if (iface->available == new_state)
 398                 return;
 399
 400         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 401         iface->available = new_state;
 402
 403         if (new_state) {
 404                 if (iface->autostart && !config_init)
 405                         interface_set_up(iface);
 406         } else
 407                 __interface_set_down(iface, true);
 408 }
 409
 410 void
 411 interface_add_user(struct interface_user *dep, struct interface *iface)
 412 {
 413         if (!iface) {
 414                 list_add(&dep->list, &iface_all_users);
 415                 return;
 416         }
 417
 418         dep->iface = iface;
 419         list_add(&dep->list, &iface->users);
 420         if (iface->state == IFS_UP)
 421                 dep->cb(dep, iface, IFEV_UP);
 422 }
 423
 424 void
 425 interface_remove_user(struct interface_user *dep)
 426 {
 427         list_del_init(&dep->list);
 428         dep->iface = NULL;
 429 }
 430
 431 static void
 432 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 433 {
 434         struct blob_attr *cur;
 435         int rem;
 436
 437         blobmsg_for_each_attr(cur, list, rem) {
 438                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 439                         continue;
 440
 441                 if (!blobmsg_check_attr(cur, NULL))
 442                         continue;
 443
 444                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 445                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 446                 list_add(&c->head, &iface->assignment_classes);
 447         }
 448 }
 449
 450 static void
 451 interface_clear_assignment_classes(struct interface *iface)
 452 {
 453         while (!list_empty(&iface->assignment_classes)) {
 454                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 455                                 struct interface_assignment_class, head);
 456                 list_del(&c->head);
 457                 free(c);
 458         }
 459 }
 460
 461 static void
 462 interface_merge_assignment_data(struct interface *old, struct interface *new)
 463 {
 464         bool changed = (old->assignment_hint != new->assignment_hint ||
 465                         old->assignment_length != new->assignment_length ||
 466                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 467                         (old->assignment_iface_id_selection == IFID_FIXED &&
 468                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 469                                 sizeof(old->assignment_fixed_iface_id))) ||
 470                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 471
 472         struct interface_assignment_class *c;
 473         list_for_each_entry(c, &new->assignment_classes, head) {
 474                 // Compare list entries one-by-one to see if there was a change
 475                 if (list_empty(&old->assignment_classes)) // The new list is longer
 476                         changed = true;
 477
 478                 if (changed)
 479                         break;
 480
 481                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 482                                 struct interface_assignment_class, head);
 483
 484                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 485                         break;
 486
 487                 list_del(&c_old->head);
 488                 free(c_old);
 489         }
 490
 491         // The old list was longer than the new one or the last entry didn't match
 492         if (!list_empty(&old->assignment_classes)) {
 493                 interface_clear_assignment_classes(old);
 494                 changed = true;
 495         }
 496
 497         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 498
 499         if (changed) {
 500                 old->assignment_hint = new->assignment_hint;
 501                 old->assignment_length = new->assignment_length;
 502                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 503                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 504                 interface_refresh_assignments(true);
 505         }
 506 }
 507
 508 static void
 509 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 510 {
 511         struct interface *alias = container_of(dep, struct interface, parent_iface);
 512         struct device *dev = iface->l3_dev.dev;
 513
 514         switch (ev) {
 515         case IFEV_UP:
 516                 if (!dev)
 517                         return;
 518
 519                 interface_set_main_dev(alias, dev);
 520                 interface_set_available(alias, true);
 521                 break;
 522         case IFEV_DOWN:
 523                 interface_set_available(alias, false);
 524                 interface_set_main_dev(alias, NULL);
 525                 break;
 526         case IFEV_FREE:
 527                 interface_remove_user(dep);
 528                 break;
 529         case IFEV_RELOAD:
 530         case IFEV_UPDATE:
 531                 break;
 532         }
 533 }
 534
 535 static void
 536 interface_set_device_config(struct interface *iface, struct device *dev)
 537 {
 538         if (!dev || !dev->default_config)
 539                 return;
 540
 541         if (!iface->device_config &&
 542             (!dev->iface_config || dev->config_iface != iface))
 543                 return;
 544
 545         dev->config_iface = iface;
 546         dev->iface_config = iface->device_config;
 547         device_apply_config(dev, dev->type, iface->config);
 548 }
 549
 550 static void
 551 interface_claim_device(struct interface *iface)
 552 {
 553         struct interface *parent;
 554         struct device *dev = NULL;
 555
 556         if (iface->parent_iface.iface)
 557                 interface_remove_user(&iface->parent_iface);
 558
 559         if (iface->parent_ifname) {
 560                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 561                 iface->parent_iface.cb = interface_alias_cb;
 562                 interface_add_user(&iface->parent_iface, parent);
 563         } else if (iface->ifname &&
 564                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 565                 dev = device_get(iface->ifname, true);
 566                 interface_set_device_config(iface, dev);
 567         } else {
 568                 dev = iface->ext_dev.dev;
 569         }
 570
 571         if (dev)
 572                 interface_set_main_dev(iface, dev);
 573
 574         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 575                 interface_set_available(iface, true);
 576 }
 577
 578 static void
 579 interface_cleanup_state(struct interface *iface)
 580 {
 581         interface_set_available(iface, false);
 582
 583         interface_flush_state(iface);
 584         interface_clear_errors(iface);
 585         interface_set_proto_state(iface, NULL);
 586
 587         interface_set_main_dev(iface, NULL);
 588         interface_set_l3_dev(iface, NULL);
 589 }
 590
 591 static void
 592 interface_cleanup(struct interface *iface)
 593 {
 594         struct interface_user *dep, *tmp;
 595
 596         uloop_timeout_cancel(&iface->remove_timer);
 597         device_remove_user(&iface->ext_dev);
 598
 599         if (iface->parent_iface.iface)
 600                 interface_remove_user(&iface->parent_iface);
 601
 602         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 603                 interface_remove_user(dep);
 604
 605         interface_clear_assignment_classes(iface);
 606         interface_ip_flush(&iface->config_ip);
 607         interface_cleanup_state(iface);
 608 }
 609
 610 static void
 611 interface_do_free(struct interface *iface)
 612 {
 613         interface_event(iface, IFEV_FREE);
 614         interface_cleanup(iface);
 615         free(iface->config);
 616         netifd_ubus_remove_interface(iface);
 617         avl_delete(&interfaces.avl, &iface->node.avl);
 618         free(iface);
 619 }
 620
 621 static void
 622 interface_do_reload(struct interface *iface)
 623 {
 624         interface_event(iface, IFEV_RELOAD);
 625         interface_cleanup_state(iface);
 626         proto_init_interface(iface, iface->config);
 627         interface_claim_device(iface);
 628 }
 629
 630 static void
 631 interface_handle_config_change(struct interface *iface)
 632 {
 633         enum interface_config_state state = iface->config_state;
 634
 635         iface->config_state = IFC_NORMAL;
 636         switch(state) {
 637         case IFC_NORMAL:
 638                 break;
 639         case IFC_RELOAD:
 640                 interface_do_reload(iface);
 641                 break;
 642         case IFC_REMOVE:
 643                 interface_do_free(iface);
 644                 return;
 645         }
 646         if (iface->autostart && iface->available)
 647                 interface_set_up(iface);
 648         else if (iface->dynamic)
 649                 set_config_state(iface, IFC_REMOVE);
 650 }
 651
 652 static void
 653 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 654 {
 655         struct interface *iface = state->iface;
 656
 657         switch (ev) {
 658         case IFPEV_UP:
 659                 if (iface->state != IFS_SETUP) {
 660                         interface_event(iface, IFEV_UPDATE);
 661                         return;
 662                 }
 663
 664                 if (!iface->l3_dev.dev)
 665                         interface_set_l3_dev(iface, iface->main_dev.dev);
 666
 667                 interface_ip_set_enabled(&iface->config_ip, true);
 668                 interface_ip_set_enabled(&iface->proto_ip, true);
 669                 system_flush_routes();
 670                 iface->state = IFS_UP;
 671                 iface->start_time = system_get_rtime();
 672                 interface_event(iface, IFEV_UP);
 673                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 674                 break;
 675         case IFPEV_DOWN:
 676                 if (iface->state == IFS_DOWN)
 677                         return;
 678
 679                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 680                 mark_interface_down(iface);
 681                 if (iface->main_dev.dev)
 682                         device_release(&iface->main_dev);
 683                 if (iface->l3_dev.dev)
 684                         device_remove_user(&iface->l3_dev);
 685                 interface_handle_config_change(iface);
 686                 break;
 687         case IFPEV_LINK_LOST:
 688                 if (iface->state != IFS_UP)
 689                         return;
 690
 691                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 692                 mark_interface_down(iface);
 693                 iface->state = IFS_SETUP;
 694                 break;
 695         default:
 696                 return;
 697         }
 698
 699         interface_write_resolv_conf();
 700 }
 701
 702 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 703 {
 704         if (iface->proto) {
 705                 iface->proto->free(iface->proto);
 706                 iface->proto = NULL;
 707         }
 708         iface->state = IFS_DOWN;
 709         iface->proto = state;
 710         if (!state)
 711                 return;
 712
 713         state->proto_event = interface_proto_event_cb;
 714         state->iface = iface;
 715 }
 716
 717 struct interface *
 718 interface_alloc(const char *name, struct blob_attr *config)
 719 {
 720         struct interface *iface;
 721         struct blob_attr *tb[IFACE_ATTR_MAX];
 722         struct blob_attr *cur;
 723         const char *proto_name = NULL;
 724         char *iface_name;
 725         bool force_link = false;
 726
 727         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 728         iface->name = strcpy(iface_name, name);
 729         INIT_LIST_HEAD(&iface->errors);
 730         INIT_LIST_HEAD(&iface->users);
 731         INIT_LIST_HEAD(&iface->hotplug_list);
 732         INIT_LIST_HEAD(&iface->assignment_classes);
 733         interface_ip_init(iface);
 734         avl_init(&iface->data, avl_strcmp, false, NULL);
 735         iface->config_ip.enabled = false;
 736
 737         iface->main_dev.cb = interface_main_dev_cb;
 738         iface->l3_dev.cb = interface_l3_dev_cb;
 739         iface->ext_dev.cb = interface_ext_dev_cb;
 740
 741         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 742                       blob_data(config), blob_len(config));
 743
 744         if ((cur = tb[IFACE_ATTR_PROTO]))
 745                 proto_name = blobmsg_data(cur);
 746
 747         proto_attach_interface(iface, proto_name);
 748         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 749                 force_link = true;
 750
 751         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 752         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 753         iface->proto_ip.no_defaultroute =
 754                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 755         iface->proto_ip.no_dns =
 756                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 757
 758         if ((cur = tb[IFACE_ATTR_DNS]))
 759                 interface_add_dns_server_list(&iface->config_ip, cur);
 760
 761         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 762                 interface_add_dns_search_list(&iface->config_ip, cur);
 763
 764         if ((cur = tb[IFACE_ATTR_METRIC]))
 765                 iface->metric = blobmsg_get_u32(cur);
 766
 767         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 768                 iface->assignment_length = blobmsg_get_u32(cur);
 769
 770         /* defaults */
 771         iface->assignment_iface_id_selection = IFID_FIXED;
 772         iface->assignment_fixed_iface_id = in6addr_any;
 773         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 774
 775         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 776                 const char *ifaceid = blobmsg_data(cur);
 777                 if (!strcmp(ifaceid, "random")) {
 778                         iface->assignment_iface_id_selection = IFID_RANDOM;
 779                 }
 780                 else if (!strcmp(ifaceid, "eui64")) {
 781                         iface->assignment_iface_id_selection = IFID_EUI64;
 782                 }
 783                 else {
 784                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 785                            if we cannot parse -> revert to iface id 1 */
 786                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 787                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 788                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 789                                 iface->assignment_fixed_iface_id = in6addr_any;
 790                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 791                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 792                                                         falling back to iface id 1.\n", iface->name);
 793                         }
 794                 }
 795         }
 796
 797         iface->assignment_hint = -1;
 798         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 799                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 800                                 ~((1 << (64 - iface->assignment_length)) - 1);
 801
 802         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 803                 interface_add_assignment_classes(iface, cur);
 804
 805
 806         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 807                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 808                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 809         }
 810
 811         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 812                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 813                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 814         }
 815
 816         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 817
 818         iface->config_autostart = iface->autostart;
 819         return iface;
 820 }
 821
 822 void interface_set_dynamic(struct interface *iface)
 823 {
 824         iface->dynamic = true;
 825         iface->autostart = true;
 826         iface->node.version = -1; // Don't delete on reload
 827 }
 828
 829 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 830 {
 831         struct blob_attr *tb[IFACE_ATTR_MAX];
 832         struct blob_attr *cur;
 833
 834         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 835                       blob_data(config), blob_len(config));
 836
 837         if (alias) {
 838                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 839                         iface->parent_ifname = blobmsg_data(cur);
 840
 841                 if (!iface->parent_ifname)
 842                         return false;
 843         } else {
 844                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 845                         iface->ifname = blobmsg_data(cur);
 846         }
 847
 848         iface->config = config;
 849         vlist_add(&interfaces, &iface->node, iface->name);
 850         return true;
 851 }
 852
 853 void
 854 interface_add(struct interface *iface, struct blob_attr *config)
 855 {
 856         __interface_add(iface, config, false);
 857 }
 858
 859 bool
 860 interface_add_alias(struct interface *iface, struct blob_attr *config)
 861 {
 862         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 863                 return false;
 864
 865         return __interface_add(iface, config, true);
 866 }
 867
 868 void
 869 interface_set_l3_dev(struct interface *iface, struct device *dev)
 870 {
 871         bool enabled = iface->config_ip.enabled;
 872         bool claimed = iface->l3_dev.claimed;
 873
 874         if (iface->l3_dev.dev == dev)
 875                 return;
 876
 877         interface_ip_set_enabled(&iface->config_ip, false);
 878         interface_ip_set_enabled(&iface->proto_ip, false);
 879         interface_ip_flush(&iface->proto_ip);
 880         device_add_user(&iface->l3_dev, dev);
 881
 882         if (dev) {
 883                 if (claimed) {
 884                         if (device_claim(&iface->l3_dev) < 0)
 885                                 return;
 886                 }
 887                 interface_ip_set_enabled(&iface->config_ip, enabled);
 888                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 889         }
 890 }
 891
 892 void
 893 interface_set_main_dev(struct interface *iface, struct device *dev)
 894 {
 895         bool claimed = iface->l3_dev.claimed;
 896
 897         if (iface->main_dev.dev == dev)
 898                 return;
 899
 900         interface_set_available(iface, false);
 901         device_add_user(&iface->main_dev, dev);
 902         if (!dev) {
 903                 interface_set_link_state(iface, false);
 904                 return;
 905         }
 906
 907         if (claimed) {
 908                 if (device_claim(&iface->l3_dev) < 0)
 909                         return;
 910         }
 911
 912         if (!iface->l3_dev.dev)
 913                 interface_set_l3_dev(iface, dev);
 914 }
 915
 916 int
 917 interface_remove_link(struct interface *iface, struct device *dev)
 918 {
 919         struct device *mdev = iface->main_dev.dev;
 920
 921         if (mdev && mdev->hotplug_ops)
 922                 return mdev->hotplug_ops->del(mdev, dev);
 923
 924         if (dev == iface->ext_dev.dev)
 925                 device_remove_user(&iface->ext_dev);
 926
 927         if (!iface->main_dev.hotplug)
 928                 return UBUS_STATUS_INVALID_ARGUMENT;
 929
 930         if (dev != iface->main_dev.dev)
 931                 return UBUS_STATUS_INVALID_ARGUMENT;
 932
 933         interface_set_main_dev(iface, NULL);
 934         return 0;
 935 }
 936
 937 static int
 938 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 939 {
 940         struct device *mdev = iface->main_dev.dev;
 941
 942         if (mdev == dev)
 943                 return 0;
 944
 945         if (iface->main_dev.hotplug)
 946                 device_remove_user(&iface->main_dev);
 947
 948         if (mdev) {
 949                 if (mdev->hotplug_ops)
 950                         return mdev->hotplug_ops->add(mdev, dev);
 951                 else
 952                         return UBUS_STATUS_NOT_SUPPORTED;
 953         }
 954
 955         if (link_ext)
 956                 device_add_user(&iface->ext_dev, dev);
 957
 958         interface_set_main_dev(iface, dev);
 959         iface->main_dev.hotplug = true;
 960         return 0;
 961 }
 962
 963 int
 964 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 965 {
 966         struct device *dev;
 967         int ret;
 968
 969         device_lock();
 970
 971         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
 972         if (!dev) {
 973                 ret = UBUS_STATUS_NOT_FOUND;
 974                 goto out;
 975         }
 976
 977         if (add) {
 978                 interface_set_device_config(iface, dev);
 979                 device_set_present(dev, true);
 980
 981                 ret = interface_add_link(iface, dev, link_ext);
 982         } else {
 983                 ret = interface_remove_link(iface, dev);
 984         }
 985
 986 out:
 987         device_unlock();
 988
 989         return ret;
 990 }
 991
 992 int
 993 interface_set_up(struct interface *iface)
 994 {
 995         int ret;
 996
 997         iface->autostart = true;
 998
 999         if (iface->state != IFS_DOWN)
1000                 return 0;
1001
1002         interface_clear_errors(iface);
1003         if (!iface->available) {
1004                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
1005                 return -1;
1006         }
1007
1008         if (iface->main_dev.dev) {
1009                 ret = device_claim(&iface->main_dev);
1010                 if (!ret)
1011                         interface_check_state(iface);
1012         }
1013         else
1014                 ret = __interface_set_up(iface);
1015
1016         return ret;
1017 }
1018
1019 int
1020 interface_set_down(struct interface *iface)
1021 {
1022         if (!iface) {
1023                 vlist_for_each_element(&interfaces, iface, node)
1024                         __interface_set_down(iface, false);
1025         } else {
1026                 iface->autostart = false;
1027                 __interface_set_down(iface, false);
1028         }
1029
1030         return 0;
1031 }
1032
1033 void
1034 interface_start_pending(void)
1035 {
1036         struct interface *iface;
1037
1038         vlist_for_each_element(&interfaces, iface, node) {
1039                 if (iface->available && iface->autostart)
1040                         interface_set_up(iface);
1041         }
1042 }
1043
1044 static void
1045 set_config_state(struct interface *iface, enum interface_config_state s)
1046 {
1047         iface->config_state = s;
1048         if (iface->state == IFS_DOWN)
1049                 interface_handle_config_change(iface);
1050         else
1051                 __interface_set_down(iface, false);
1052 }
1053
1054 void
1055 interface_update_start(struct interface *iface)
1056 {
1057         iface->updated = 0;
1058         interface_ip_update_start(&iface->proto_ip);
1059 }
1060
1061 void
1062 interface_update_complete(struct interface *iface)
1063 {
1064         interface_ip_update_complete(&iface->proto_ip);
1065 }
1066
1067 static void
1068 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1069 {
1070         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1071         vlist_simple_replace(&new->dns_search, &old->dns_search);
1072 }
1073
1074 static bool
1075 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1076 {
1077         struct blob_attr *ntb[__DEV_ATTR_MAX];
1078         struct blob_attr *otb[__DEV_ATTR_MAX];
1079         struct device *dev = if_old->main_dev.dev;
1080         unsigned long diff = 0;
1081
1082         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1083
1084         if (!dev)
1085                 return false;
1086
1087         if (if_old->device_config != if_new->device_config)
1088                 return true;
1089
1090         if (!if_new->device_config)
1091                 return false;
1092
1093         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1094                 blob_data(if_old->config), blob_len(if_old->config));
1095
1096         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1097                 blob_data(if_new->config), blob_len(if_new->config));
1098
1099         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1100         return diff;
1101 }
1102
1103 static void
1104 interface_change_config(struct interface *if_old, struct interface *if_new)
1105 {
1106         struct blob_attr *old_config = if_old->config;
1107         bool reload = false, reload_ip = false;
1108
1109 #define FIELD_CHANGED_STR(field)                                        \
1110                 ((!!if_old->field != !!if_new->field) ||                \
1111                  (if_old->field &&                                      \
1112                   strcmp(if_old->field, if_new->field) != 0))
1113
1114         if (FIELD_CHANGED_STR(parent_ifname)) {
1115                 if (if_old->parent_iface.iface)
1116                         interface_remove_user(&if_old->parent_iface);
1117                 reload = true;
1118         }
1119
1120         if (!reload && interface_device_config_changed(if_old, if_new))
1121                 reload = true;
1122
1123         if (FIELD_CHANGED_STR(ifname) ||
1124             if_old->proto_handler != if_new->proto_handler)
1125                 reload = true;
1126
1127         if (!if_old->proto_handler->config_params)
1128                 D(INTERFACE, "No config parameters for interface '%s'\n",
1129                   if_old->name);
1130         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1131                                        if_old->proto_handler->config_params))
1132                 reload = true;
1133
1134 #define UPDATE(field, __var) ({                                         \
1135                 bool __changed = (if_old->field != if_new->field);      \
1136                 if_old->field = if_new->field;                          \
1137                 __var |= __changed;                                     \
1138         })
1139
1140         if_old->config = if_new->config;
1141         if (if_old->config_autostart != if_new->config_autostart) {
1142                 if (if_old->config_autostart)
1143                         reload = true;
1144
1145                 if_old->autostart = if_new->config_autostart;
1146         }
1147
1148         if_old->device_config = if_new->device_config;
1149         if_old->config_autostart = if_new->config_autostart;
1150         if_old->ifname = if_new->ifname;
1151         if_old->parent_ifname = if_new->parent_ifname;
1152         if_old->proto_handler = if_new->proto_handler;
1153         if_old->force_link = if_new->force_link;
1154
1155         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1156         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1157
1158         UPDATE(metric, reload_ip);
1159         UPDATE(proto_ip.no_defaultroute, reload_ip);
1160         UPDATE(ip4table, reload_ip);
1161         UPDATE(ip6table, reload_ip);
1162         interface_merge_assignment_data(if_old, if_new);
1163
1164 #undef UPDATE
1165
1166         if (reload) {
1167                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1168                   if_old->name);
1169                 interface_clear_errors(if_old);
1170                 set_config_state(if_old, IFC_RELOAD);
1171                 goto out;
1172         }
1173
1174         if (reload_ip) {
1175                 bool config_ip_enabled = if_old->config_ip.enabled;
1176                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1177
1178                 interface_ip_set_enabled(&if_old->config_ip, false);
1179                 interface_ip_set_enabled(&if_old->proto_ip, false);
1180                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1181                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1182         }
1183
1184         interface_write_resolv_conf();
1185         if (if_old->main_dev.dev)
1186                 interface_check_state(if_old);
1187
1188 out:
1189         if_new->config = NULL;
1190         interface_cleanup(if_new);
1191         free(old_config);
1192         free(if_new);
1193 }
1194
1195 static void
1196 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1197                  struct vlist_node *node_old)
1198 {
1199         struct interface *if_old = container_of(node_old, struct interface, node);
1200         struct interface *if_new = container_of(node_new, struct interface, node);
1201
1202         if (node_old && node_new) {
1203                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1204                 interface_change_config(if_old, if_new);
1205         } else if (node_old) {
1206                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1207                 set_config_state(if_old, IFC_REMOVE);
1208         } else if (node_new) {
1209                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1210                 proto_init_interface(if_new, if_new->config);
1211                 interface_claim_device(if_new);
1212                 netifd_ubus_add_interface(if_new);
1213         }
1214 }
1215
1216
1217 static void __init
1218 interface_init_list(void)
1219 {
1220         vlist_init(&interfaces, avl_strcmp, interface_update);
1221         interfaces.keep_old = true;
1222         interfaces.no_delete = true;
1223 }