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 static void
  79 interface_event(struct interface *iface, enum interface_event ev);
  80
  81 static void
  82 interface_error_flush(struct interface *iface)
  83 {
  84         struct interface_error *error, *tmp;
  85
  86         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  87                 list_del(&error->list);
  88                 free(error);
  89         }
  90 }
  91
  92 static void
  93 interface_clear_errors(struct interface *iface)
  94 {
  95         /* don't flush the errors in case the configured protocol handler matches the
  96            running protocol handler and is having the last error capability */
  97         if (!(iface->proto &&
  98               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
  99               (iface->proto->handler->name == iface->proto_handler->name)))
 100                 interface_error_flush(iface);
 101 }
 102
 103 void interface_add_error(struct interface *iface, const char *subsystem,
 104                          const char *code, const char **data, int n_data)
 105 {
 106         struct interface_error *error;
 107         int i, len = 0;
 108         int *datalen = NULL;
 109         char *dest, *d_subsys, *d_code;
 110
 111         /* if the configured protocol handler has the last error support capability,
 112            errors should only be added if the running protocol handler matches the
 113            configured one */
 114         if (iface->proto &&
 115             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 116             (iface->proto->handler->name != iface->proto_handler->name))
 117                 return;
 118
 119         if (n_data) {
 120                 len = n_data * sizeof(char *);
 121                 datalen = alloca(len);
 122                 for (i = 0; i < n_data; i++) {
 123                         datalen[i] = strlen(data[i]) + 1;
 124                         len += datalen[i];
 125                 }
 126         }
 127
 128         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 129                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 130                 &d_code, code ? strlen(code) + 1 : 0);
 131         if (!error)
 132                 return;
 133
 134         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 135            protocol can't be established (e.g auth failure) */
 136         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 137                 interface_error_flush(iface);
 138
 139         list_add_tail(&error->list, &iface->errors);
 140
 141         dest = (char *) &error->data[n_data + 1];
 142         for (i = 0; i < n_data; i++) {
 143                 error->data[i] = dest;
 144                 memcpy(dest, data[i], datalen[i]);
 145                 dest += datalen[i];
 146         }
 147         error->data[n_data] = NULL;
 148
 149         if (subsystem)
 150                 error->subsystem = strcpy(d_subsys, subsystem);
 151
 152         if (code)
 153                 error->code = strcpy(d_code, code);
 154 }
 155
 156 static void
 157 interface_data_del(struct interface *iface, struct interface_data *data)
 158 {
 159         avl_delete(&iface->data, &data->node);
 160         free(data);
 161 }
 162
 163 static void
 164 interface_data_flush(struct interface *iface)
 165 {
 166         struct interface_data *d, *tmp;
 167
 168         avl_for_each_element_safe(&iface->data, d, node, tmp)
 169                 interface_data_del(iface, d);
 170 }
 171
 172 int
 173 interface_add_data(struct interface *iface, const struct blob_attr *data)
 174 {
 175         struct interface_data *n, *o;
 176
 177         if (!blobmsg_check_attr(data, true))
 178                 return UBUS_STATUS_INVALID_ARGUMENT;
 179
 180         const char *name = blobmsg_name(data);
 181         unsigned len = blob_pad_len(data);
 182
 183         o = avl_find_element(&iface->data, name, o, node);
 184         if (o) {
 185                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 186                         return 0;
 187
 188                 interface_data_del(iface, o);
 189         }
 190
 191         n = calloc(1, sizeof(*n) + len);
 192         memcpy(n->data, data, len);
 193         n->node.key = blobmsg_name(n->data);
 194         avl_insert(&iface->data, &n->node);
 195
 196         iface->updated |= IUF_DATA;
 197         return 0;
 198 }
 199
 200 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 201 {
 202         struct blob_attr *cur;
 203         int rem, ret;
 204
 205         iface->updated = 0;
 206
 207         blob_for_each_attr(cur, attr, rem) {
 208                 ret = interface_add_data(iface, cur);
 209                 if (ret)
 210                         return ret;
 211         }
 212
 213         if (iface->updated && iface->state == IFS_UP)
 214                 interface_event(iface, IFEV_UPDATE);
 215
 216         return 0;
 217 }
 218
 219 static void
 220 interface_event(struct interface *iface, enum interface_event ev)
 221 {
 222         struct interface_user *dep, *tmp;
 223         struct device *adev = NULL;
 224
 225         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 226                 dep->cb(dep, iface, ev);
 227
 228         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 229                 dep->cb(dep, iface, ev);
 230
 231         switch (ev) {
 232         case IFEV_UP:
 233                 interface_error_flush(iface);
 234                 adev = iface->l3_dev.dev;
 235                 /* fall through */
 236         case IFEV_DOWN:
 237                 alias_notify_device(iface->name, adev);
 238                 break;
 239         default:
 240                 break;
 241         }
 242 }
 243
 244 static void
 245 interface_flush_state(struct interface *iface)
 246 {
 247         if (iface->l3_dev.dev)
 248                 device_release(&iface->l3_dev);
 249         interface_data_flush(iface);
 250 }
 251
 252 static void
 253 mark_interface_down(struct interface *iface)
 254 {
 255         enum interface_state state = iface->state;
 256
 257         if (state == IFS_DOWN)
 258                 return;
 259
 260         iface->state = IFS_DOWN;
 261         if (state == IFS_UP)
 262                 interface_event(iface, IFEV_DOWN);
 263         interface_ip_set_enabled(&iface->config_ip, false);
 264         interface_ip_set_enabled(&iface->proto_ip, false);
 265         interface_ip_flush(&iface->proto_ip);
 266         interface_flush_state(iface);
 267         system_flush_routes();
 268 }
 269
 270 void
 271 __interface_set_down(struct interface *iface, bool force)
 272 {
 273         enum interface_state state = iface->state;
 274         switch (state) {
 275         case IFS_UP:
 276         case IFS_SETUP:
 277                 iface->state = IFS_TEARDOWN;
 278                 if (state == IFS_UP)
 279                         interface_event(iface, IFEV_DOWN);
 280
 281                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 282                 if (force)
 283                         interface_flush_state(iface);
 284                 break;
 285
 286         case IFS_DOWN:
 287                 if (iface->main_dev.dev)
 288                         device_release(&iface->main_dev);
 289         case IFS_TEARDOWN:
 290         default:
 291                 break;
 292         }
 293 }
 294
 295 static int
 296 __interface_set_up(struct interface *iface)
 297 {
 298         int ret;
 299
 300         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 301
 302         iface->state = IFS_SETUP;
 303         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 304         if (ret)
 305                 mark_interface_down(iface);
 306
 307         return ret;
 308 }
 309
 310 static void
 311 interface_check_state(struct interface *iface)
 312 {
 313         bool link_state = iface->link_state || iface->force_link;
 314
 315         switch (iface->state) {
 316         case IFS_UP:
 317         case IFS_SETUP:
 318                 if (!iface->enabled || !link_state) {
 319                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 320                         mark_interface_down(iface);
 321                 }
 322                 break;
 323         case IFS_DOWN:
 324                 if (!iface->available)
 325                         return;
 326
 327                 if (iface->autostart && iface->enabled && link_state && !config_init)
 328                         __interface_set_up(iface);
 329                 break;
 330         default:
 331                 break;
 332         }
 333 }
 334
 335 static void
 336 interface_set_enabled(struct interface *iface, bool new_state)
 337 {
 338         if (iface->enabled == new_state)
 339                 return;
 340
 341         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 342         iface->enabled = new_state;
 343         interface_check_state(iface);
 344 }
 345
 346 static void
 347 interface_set_link_state(struct interface *iface, bool new_state)
 348 {
 349         if (iface->link_state == new_state)
 350                 return;
 351
 352         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 353         iface->link_state = new_state;
 354         interface_check_state(iface);
 355 }
 356
 357 static void
 358 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 359 {
 360         if (ev == DEV_EVENT_REMOVE)
 361                 device_remove_user(dep);
 362 }
 363
 364 static void
 365 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 366 {
 367         struct interface *iface;
 368         bool new_state = false;
 369
 370         iface = container_of(dep, struct interface, main_dev);
 371         switch (ev) {
 372         case DEV_EVENT_ADD:
 373                 new_state = true;
 374         case DEV_EVENT_REMOVE:
 375                 interface_set_available(iface, new_state);
 376                 if (!new_state && dep->dev && dep->dev->external)
 377                         interface_set_main_dev(iface, NULL);
 378                 break;
 379         case DEV_EVENT_UP:
 380                 new_state = true;
 381         case DEV_EVENT_DOWN:
 382                 interface_set_enabled(iface, new_state);
 383                 break;
 384         case DEV_EVENT_LINK_UP:
 385                 new_state = true;
 386         case DEV_EVENT_LINK_DOWN:
 387                 interface_set_link_state(iface, new_state);
 388                 break;
 389         case DEV_EVENT_TOPO_CHANGE:
 390                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 391                 return;
 392         default:
 393                 break;
 394         }
 395 }
 396
 397 static void
 398 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 399 {
 400         struct interface *iface;
 401
 402         iface = container_of(dep, struct interface, l3_dev);
 403         if (iface->l3_dev.dev == iface->main_dev.dev)
 404                 return;
 405
 406         switch (ev) {
 407         case DEV_EVENT_LINK_DOWN:
 408                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 409                 break;
 410         default:
 411                 break;
 412         }
 413 }
 414
 415 void
 416 interface_set_available(struct interface *iface, bool new_state)
 417 {
 418         if (iface->available == new_state)
 419                 return;
 420
 421         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 422         iface->available = new_state;
 423
 424         if (new_state) {
 425                 if (iface->autostart && !config_init)
 426                         interface_set_up(iface);
 427         } else
 428                 __interface_set_down(iface, true);
 429 }
 430
 431 void
 432 interface_add_user(struct interface_user *dep, struct interface *iface)
 433 {
 434         if (!iface) {
 435                 list_add(&dep->list, &iface_all_users);
 436                 return;
 437         }
 438
 439         dep->iface = iface;
 440         list_add(&dep->list, &iface->users);
 441         if (iface->state == IFS_UP)
 442                 dep->cb(dep, iface, IFEV_UP);
 443 }
 444
 445 void
 446 interface_remove_user(struct interface_user *dep)
 447 {
 448         list_del_init(&dep->list);
 449         dep->iface = NULL;
 450 }
 451
 452 static void
 453 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 454 {
 455         struct blob_attr *cur;
 456         int rem;
 457
 458         blobmsg_for_each_attr(cur, list, rem) {
 459                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 460                         continue;
 461
 462                 if (!blobmsg_check_attr(cur, NULL))
 463                         continue;
 464
 465                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 466                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 467                 list_add(&c->head, &iface->assignment_classes);
 468         }
 469 }
 470
 471 static void
 472 interface_clear_assignment_classes(struct interface *iface)
 473 {
 474         while (!list_empty(&iface->assignment_classes)) {
 475                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 476                                 struct interface_assignment_class, head);
 477                 list_del(&c->head);
 478                 free(c);
 479         }
 480 }
 481
 482 static void
 483 interface_merge_assignment_data(struct interface *old, struct interface *new)
 484 {
 485         bool changed = (old->assignment_hint != new->assignment_hint ||
 486                         old->assignment_length != new->assignment_length ||
 487                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 488                         (old->assignment_iface_id_selection == IFID_FIXED &&
 489                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 490                                 sizeof(old->assignment_fixed_iface_id))) ||
 491                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 492
 493         struct interface_assignment_class *c;
 494         list_for_each_entry(c, &new->assignment_classes, head) {
 495                 // Compare list entries one-by-one to see if there was a change
 496                 if (list_empty(&old->assignment_classes)) // The new list is longer
 497                         changed = true;
 498
 499                 if (changed)
 500                         break;
 501
 502                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 503                                 struct interface_assignment_class, head);
 504
 505                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 506                         break;
 507
 508                 list_del(&c_old->head);
 509                 free(c_old);
 510         }
 511
 512         // The old list was longer than the new one or the last entry didn't match
 513         if (!list_empty(&old->assignment_classes)) {
 514                 interface_clear_assignment_classes(old);
 515                 changed = true;
 516         }
 517
 518         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 519
 520         if (changed) {
 521                 old->assignment_hint = new->assignment_hint;
 522                 old->assignment_length = new->assignment_length;
 523                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 524                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 525                 interface_refresh_assignments(true);
 526         }
 527 }
 528
 529 static void
 530 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 531 {
 532         struct interface *alias = container_of(dep, struct interface, parent_iface);
 533         struct device *dev = iface->l3_dev.dev;
 534
 535         switch (ev) {
 536         case IFEV_UP:
 537                 if (!dev)
 538                         return;
 539
 540                 interface_set_main_dev(alias, dev);
 541                 interface_set_available(alias, true);
 542                 break;
 543         case IFEV_DOWN:
 544                 interface_set_available(alias, false);
 545                 interface_set_main_dev(alias, NULL);
 546                 break;
 547         case IFEV_FREE:
 548                 interface_remove_user(dep);
 549                 break;
 550         case IFEV_RELOAD:
 551         case IFEV_UPDATE:
 552                 break;
 553         }
 554 }
 555
 556 static void
 557 interface_set_device_config(struct interface *iface, struct device *dev)
 558 {
 559         if (!dev || !dev->default_config)
 560                 return;
 561
 562         if (!iface->device_config &&
 563             (!dev->iface_config || dev->config_iface != iface))
 564                 return;
 565
 566         dev->config_iface = iface;
 567         dev->iface_config = iface->device_config;
 568         device_apply_config(dev, dev->type, iface->config);
 569 }
 570
 571 static void
 572 interface_claim_device(struct interface *iface)
 573 {
 574         struct interface *parent;
 575         struct device *dev = NULL;
 576
 577         if (iface->parent_iface.iface)
 578                 interface_remove_user(&iface->parent_iface);
 579
 580         if (iface->parent_ifname) {
 581                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 582                 iface->parent_iface.cb = interface_alias_cb;
 583                 interface_add_user(&iface->parent_iface, parent);
 584         } else if (iface->ifname &&
 585                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 586                 dev = device_get(iface->ifname, true);
 587                 interface_set_device_config(iface, dev);
 588         } else {
 589                 dev = iface->ext_dev.dev;
 590         }
 591
 592         if (dev)
 593                 interface_set_main_dev(iface, dev);
 594
 595         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 596                 interface_set_available(iface, true);
 597 }
 598
 599 static void
 600 interface_cleanup_state(struct interface *iface)
 601 {
 602         interface_set_available(iface, false);
 603
 604         interface_flush_state(iface);
 605         interface_clear_errors(iface);
 606         interface_set_proto_state(iface, NULL);
 607
 608         interface_set_main_dev(iface, NULL);
 609         interface_set_l3_dev(iface, NULL);
 610 }
 611
 612 static void
 613 interface_cleanup(struct interface *iface)
 614 {
 615         struct interface_user *dep, *tmp;
 616
 617         uloop_timeout_cancel(&iface->remove_timer);
 618         device_remove_user(&iface->ext_dev);
 619
 620         if (iface->parent_iface.iface)
 621                 interface_remove_user(&iface->parent_iface);
 622
 623         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 624                 interface_remove_user(dep);
 625
 626         interface_clear_assignment_classes(iface);
 627         interface_ip_flush(&iface->config_ip);
 628         interface_cleanup_state(iface);
 629 }
 630
 631 static void
 632 interface_do_free(struct interface *iface)
 633 {
 634         interface_event(iface, IFEV_FREE);
 635         interface_cleanup(iface);
 636         free(iface->config);
 637         netifd_ubus_remove_interface(iface);
 638         avl_delete(&interfaces.avl, &iface->node.avl);
 639         free(iface);
 640 }
 641
 642 static void
 643 interface_do_reload(struct interface *iface)
 644 {
 645         interface_event(iface, IFEV_RELOAD);
 646         interface_cleanup_state(iface);
 647         proto_init_interface(iface, iface->config);
 648         interface_claim_device(iface);
 649 }
 650
 651 static void
 652 interface_handle_config_change(struct interface *iface)
 653 {
 654         enum interface_config_state state = iface->config_state;
 655
 656         iface->config_state = IFC_NORMAL;
 657         switch(state) {
 658         case IFC_NORMAL:
 659                 break;
 660         case IFC_RELOAD:
 661                 interface_do_reload(iface);
 662                 break;
 663         case IFC_REMOVE:
 664                 interface_do_free(iface);
 665                 return;
 666         }
 667         if (iface->autostart && iface->available)
 668                 interface_set_up(iface);
 669         else if (iface->dynamic)
 670                 set_config_state(iface, IFC_REMOVE);
 671 }
 672
 673 static void
 674 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 675 {
 676         struct interface *iface = state->iface;
 677
 678         switch (ev) {
 679         case IFPEV_UP:
 680                 if (iface->state != IFS_SETUP) {
 681                         interface_event(iface, IFEV_UPDATE);
 682                         return;
 683                 }
 684
 685                 if (!iface->l3_dev.dev)
 686                         interface_set_l3_dev(iface, iface->main_dev.dev);
 687
 688                 interface_ip_set_enabled(&iface->config_ip, true);
 689                 interface_ip_set_enabled(&iface->proto_ip, true);
 690                 system_flush_routes();
 691                 iface->state = IFS_UP;
 692                 iface->start_time = system_get_rtime();
 693                 interface_event(iface, IFEV_UP);
 694                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 695                 break;
 696         case IFPEV_DOWN:
 697                 if (iface->state == IFS_DOWN)
 698                         return;
 699
 700                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 701                 mark_interface_down(iface);
 702                 if (iface->main_dev.dev)
 703                         device_release(&iface->main_dev);
 704                 if (iface->l3_dev.dev)
 705                         device_remove_user(&iface->l3_dev);
 706                 interface_handle_config_change(iface);
 707                 break;
 708         case IFPEV_LINK_LOST:
 709                 if (iface->state != IFS_UP)
 710                         return;
 711
 712                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 713                 mark_interface_down(iface);
 714                 iface->state = IFS_SETUP;
 715                 break;
 716         default:
 717                 return;
 718         }
 719
 720         interface_write_resolv_conf();
 721 }
 722
 723 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 724 {
 725         if (iface->proto) {
 726                 iface->proto->free(iface->proto);
 727                 iface->proto = NULL;
 728         }
 729         iface->state = IFS_DOWN;
 730         iface->proto = state;
 731         if (!state)
 732                 return;
 733
 734         state->proto_event = interface_proto_event_cb;
 735         state->iface = iface;
 736 }
 737
 738 struct interface *
 739 interface_alloc(const char *name, struct blob_attr *config)
 740 {
 741         struct interface *iface;
 742         struct blob_attr *tb[IFACE_ATTR_MAX];
 743         struct blob_attr *cur;
 744         const char *proto_name = NULL;
 745         char *iface_name;
 746         bool force_link = false;
 747
 748         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 749         iface->name = strcpy(iface_name, name);
 750         INIT_LIST_HEAD(&iface->errors);
 751         INIT_LIST_HEAD(&iface->users);
 752         INIT_LIST_HEAD(&iface->hotplug_list);
 753         INIT_LIST_HEAD(&iface->assignment_classes);
 754         interface_ip_init(iface);
 755         avl_init(&iface->data, avl_strcmp, false, NULL);
 756         iface->config_ip.enabled = false;
 757
 758         iface->main_dev.cb = interface_main_dev_cb;
 759         iface->l3_dev.cb = interface_l3_dev_cb;
 760         iface->ext_dev.cb = interface_ext_dev_cb;
 761
 762         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 763                       blob_data(config), blob_len(config));
 764
 765         if ((cur = tb[IFACE_ATTR_PROTO]))
 766                 proto_name = blobmsg_data(cur);
 767
 768         proto_attach_interface(iface, proto_name);
 769         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 770                 force_link = true;
 771
 772         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 773         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 774         iface->proto_ip.no_defaultroute =
 775                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 776         iface->proto_ip.no_dns =
 777                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 778
 779         if ((cur = tb[IFACE_ATTR_DNS]))
 780                 interface_add_dns_server_list(&iface->config_ip, cur);
 781
 782         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 783                 interface_add_dns_search_list(&iface->config_ip, cur);
 784
 785         if ((cur = tb[IFACE_ATTR_METRIC]))
 786                 iface->metric = blobmsg_get_u32(cur);
 787
 788         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 789                 iface->assignment_length = blobmsg_get_u32(cur);
 790
 791         /* defaults */
 792         iface->assignment_iface_id_selection = IFID_FIXED;
 793         iface->assignment_fixed_iface_id = in6addr_any;
 794         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 795
 796         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 797                 const char *ifaceid = blobmsg_data(cur);
 798                 if (!strcmp(ifaceid, "random")) {
 799                         iface->assignment_iface_id_selection = IFID_RANDOM;
 800                 }
 801                 else if (!strcmp(ifaceid, "eui64")) {
 802                         iface->assignment_iface_id_selection = IFID_EUI64;
 803                 }
 804                 else {
 805                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 806                            if we cannot parse -> revert to iface id 1 */
 807                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 808                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 809                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 810                                 iface->assignment_fixed_iface_id = in6addr_any;
 811                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 812                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 813                                                         falling back to iface id 1.\n", iface->name);
 814                         }
 815                 }
 816         }
 817
 818         iface->assignment_hint = -1;
 819         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 820                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 821                                 ~((1 << (64 - iface->assignment_length)) - 1);
 822
 823         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 824                 interface_add_assignment_classes(iface, cur);
 825
 826
 827         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 828                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 829                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 830         }
 831
 832         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 833                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 834                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 835         }
 836
 837         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 838
 839         iface->config_autostart = iface->autostart;
 840         return iface;
 841 }
 842
 843 void interface_set_dynamic(struct interface *iface)
 844 {
 845         iface->dynamic = true;
 846         iface->autostart = true;
 847         iface->node.version = -1; // Don't delete on reload
 848 }
 849
 850 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 851 {
 852         struct blob_attr *tb[IFACE_ATTR_MAX];
 853         struct blob_attr *cur;
 854
 855         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 856                       blob_data(config), blob_len(config));
 857
 858         if (alias) {
 859                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 860                         iface->parent_ifname = blobmsg_data(cur);
 861
 862                 if (!iface->parent_ifname)
 863                         return false;
 864         } else {
 865                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 866                         iface->ifname = blobmsg_data(cur);
 867         }
 868
 869         iface->config = config;
 870         vlist_add(&interfaces, &iface->node, iface->name);
 871         return true;
 872 }
 873
 874 void
 875 interface_add(struct interface *iface, struct blob_attr *config)
 876 {
 877         __interface_add(iface, config, false);
 878 }
 879
 880 bool
 881 interface_add_alias(struct interface *iface, struct blob_attr *config)
 882 {
 883         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 884                 return false;
 885
 886         return __interface_add(iface, config, true);
 887 }
 888
 889 void
 890 interface_set_l3_dev(struct interface *iface, struct device *dev)
 891 {
 892         bool enabled = iface->config_ip.enabled;
 893         bool claimed = iface->l3_dev.claimed;
 894
 895         if (iface->l3_dev.dev == dev)
 896                 return;
 897
 898         interface_ip_set_enabled(&iface->config_ip, false);
 899         interface_ip_set_enabled(&iface->proto_ip, false);
 900         interface_ip_flush(&iface->proto_ip);
 901         device_add_user(&iface->l3_dev, dev);
 902
 903         if (dev) {
 904                 if (claimed) {
 905                         if (device_claim(&iface->l3_dev) < 0)
 906                                 return;
 907                 }
 908                 interface_ip_set_enabled(&iface->config_ip, enabled);
 909                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 910         }
 911 }
 912
 913 void
 914 interface_set_main_dev(struct interface *iface, struct device *dev)
 915 {
 916         bool claimed = iface->l3_dev.claimed;
 917
 918         if (iface->main_dev.dev == dev)
 919                 return;
 920
 921         interface_set_available(iface, false);
 922         device_add_user(&iface->main_dev, dev);
 923         if (!dev) {
 924                 interface_set_link_state(iface, false);
 925                 return;
 926         }
 927
 928         if (claimed) {
 929                 if (device_claim(&iface->l3_dev) < 0)
 930                         return;
 931         }
 932
 933         if (!iface->l3_dev.dev)
 934                 interface_set_l3_dev(iface, dev);
 935 }
 936
 937 int
 938 interface_remove_link(struct interface *iface, struct device *dev)
 939 {
 940         struct device *mdev = iface->main_dev.dev;
 941
 942         if (mdev && mdev->hotplug_ops)
 943                 return mdev->hotplug_ops->del(mdev, dev);
 944
 945         if (dev == iface->ext_dev.dev)
 946                 device_remove_user(&iface->ext_dev);
 947
 948         if (!iface->main_dev.hotplug)
 949                 return UBUS_STATUS_INVALID_ARGUMENT;
 950
 951         if (dev != iface->main_dev.dev)
 952                 return UBUS_STATUS_INVALID_ARGUMENT;
 953
 954         interface_set_main_dev(iface, NULL);
 955         return 0;
 956 }
 957
 958 static int
 959 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 960 {
 961         struct device *mdev = iface->main_dev.dev;
 962
 963         if (mdev == dev)
 964                 return 0;
 965
 966         if (iface->main_dev.hotplug)
 967                 device_remove_user(&iface->main_dev);
 968
 969         if (mdev) {
 970                 if (mdev->hotplug_ops)
 971                         return mdev->hotplug_ops->add(mdev, dev);
 972                 else
 973                         return UBUS_STATUS_NOT_SUPPORTED;
 974         }
 975
 976         if (link_ext)
 977                 device_add_user(&iface->ext_dev, dev);
 978
 979         interface_set_main_dev(iface, dev);
 980         iface->main_dev.hotplug = true;
 981         return 0;
 982 }
 983
 984 int
 985 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 986 {
 987         struct device *dev;
 988         int ret;
 989
 990         device_lock();
 991
 992         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
 993         if (!dev) {
 994                 ret = UBUS_STATUS_NOT_FOUND;
 995                 goto out;
 996         }
 997
 998         if (add) {
 999                 interface_set_device_config(iface, dev);
1000                 device_set_present(dev, true);
1001
1002                 ret = interface_add_link(iface, dev, link_ext);
1003         } else {
1004                 ret = interface_remove_link(iface, dev);
1005         }
1006
1007 out:
1008         device_unlock();
1009
1010         return ret;
1011 }
1012
1013 int
1014 interface_set_up(struct interface *iface)
1015 {
1016         int ret;
1017
1018         iface->autostart = true;
1019
1020         if (iface->state != IFS_DOWN)
1021                 return 0;
1022
1023         interface_clear_errors(iface);
1024         if (!iface->available) {
1025                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
1026                 return -1;
1027         }
1028
1029         if (iface->main_dev.dev) {
1030                 ret = device_claim(&iface->main_dev);
1031                 if (!ret)
1032                         interface_check_state(iface);
1033         }
1034         else
1035                 ret = __interface_set_up(iface);
1036
1037         return ret;
1038 }
1039
1040 int
1041 interface_set_down(struct interface *iface)
1042 {
1043         if (!iface) {
1044                 vlist_for_each_element(&interfaces, iface, node)
1045                         __interface_set_down(iface, false);
1046         } else {
1047                 iface->autostart = false;
1048                 __interface_set_down(iface, false);
1049         }
1050
1051         return 0;
1052 }
1053
1054 void
1055 interface_start_pending(void)
1056 {
1057         struct interface *iface;
1058
1059         vlist_for_each_element(&interfaces, iface, node) {
1060                 if (iface->available && iface->autostart)
1061                         interface_set_up(iface);
1062         }
1063 }
1064
1065 static void
1066 set_config_state(struct interface *iface, enum interface_config_state s)
1067 {
1068         iface->config_state = s;
1069         if (iface->state == IFS_DOWN)
1070                 interface_handle_config_change(iface);
1071         else
1072                 __interface_set_down(iface, false);
1073 }
1074
1075 void
1076 interface_update_start(struct interface *iface)
1077 {
1078         iface->updated = 0;
1079         interface_ip_update_start(&iface->proto_ip);
1080 }
1081
1082 void
1083 interface_update_complete(struct interface *iface)
1084 {
1085         interface_ip_update_complete(&iface->proto_ip);
1086 }
1087
1088 static void
1089 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1090 {
1091         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1092         vlist_simple_replace(&new->dns_search, &old->dns_search);
1093 }
1094
1095 static bool
1096 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1097 {
1098         struct blob_attr *ntb[__DEV_ATTR_MAX];
1099         struct blob_attr *otb[__DEV_ATTR_MAX];
1100         struct device *dev = if_old->main_dev.dev;
1101         unsigned long diff = 0;
1102
1103         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1104
1105         if (!dev)
1106                 return false;
1107
1108         if (if_old->device_config != if_new->device_config)
1109                 return true;
1110
1111         if (!if_new->device_config)
1112                 return false;
1113
1114         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1115                 blob_data(if_old->config), blob_len(if_old->config));
1116
1117         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1118                 blob_data(if_new->config), blob_len(if_new->config));
1119
1120         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1121         return diff;
1122 }
1123
1124 static void
1125 interface_change_config(struct interface *if_old, struct interface *if_new)
1126 {
1127         struct blob_attr *old_config = if_old->config;
1128         bool reload = false, reload_ip = false;
1129
1130 #define FIELD_CHANGED_STR(field)                                        \
1131                 ((!!if_old->field != !!if_new->field) ||                \
1132                  (if_old->field &&                                      \
1133                   strcmp(if_old->field, if_new->field) != 0))
1134
1135         if (FIELD_CHANGED_STR(parent_ifname)) {
1136                 if (if_old->parent_iface.iface)
1137                         interface_remove_user(&if_old->parent_iface);
1138                 reload = true;
1139         }
1140
1141         if (!reload && interface_device_config_changed(if_old, if_new))
1142                 reload = true;
1143
1144         if (FIELD_CHANGED_STR(ifname) ||
1145             if_old->proto_handler != if_new->proto_handler)
1146                 reload = true;
1147
1148         if (!if_old->proto_handler->config_params)
1149                 D(INTERFACE, "No config parameters for interface '%s'\n",
1150                   if_old->name);
1151         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1152                                        if_old->proto_handler->config_params))
1153                 reload = true;
1154
1155 #define UPDATE(field, __var) ({                                         \
1156                 bool __changed = (if_old->field != if_new->field);      \
1157                 if_old->field = if_new->field;                          \
1158                 __var |= __changed;                                     \
1159         })
1160
1161         if_old->config = if_new->config;
1162         if (if_old->config_autostart != if_new->config_autostart) {
1163                 if (if_old->config_autostart)
1164                         reload = true;
1165
1166                 if_old->autostart = if_new->config_autostart;
1167         }
1168
1169         if_old->device_config = if_new->device_config;
1170         if_old->config_autostart = if_new->config_autostart;
1171         if_old->ifname = if_new->ifname;
1172         if_old->parent_ifname = if_new->parent_ifname;
1173         if_old->proto_handler = if_new->proto_handler;
1174         if_old->force_link = if_new->force_link;
1175
1176         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1177         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1178
1179         UPDATE(metric, reload_ip);
1180         UPDATE(proto_ip.no_defaultroute, reload_ip);
1181         UPDATE(ip4table, reload_ip);
1182         UPDATE(ip6table, reload_ip);
1183         interface_merge_assignment_data(if_old, if_new);
1184
1185 #undef UPDATE
1186
1187         if (reload) {
1188                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1189                   if_old->name);
1190                 interface_clear_errors(if_old);
1191                 set_config_state(if_old, IFC_RELOAD);
1192                 goto out;
1193         }
1194
1195         if (reload_ip) {
1196                 bool config_ip_enabled = if_old->config_ip.enabled;
1197                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1198
1199                 interface_ip_set_enabled(&if_old->config_ip, false);
1200                 interface_ip_set_enabled(&if_old->proto_ip, false);
1201                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1202                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1203         }
1204
1205         interface_write_resolv_conf();
1206         if (if_old->main_dev.dev)
1207                 interface_check_state(if_old);
1208
1209 out:
1210         if_new->config = NULL;
1211         interface_cleanup(if_new);
1212         free(old_config);
1213         free(if_new);
1214 }
1215
1216 static void
1217 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1218                  struct vlist_node *node_old)
1219 {
1220         struct interface *if_old = container_of(node_old, struct interface, node);
1221         struct interface *if_new = container_of(node_new, struct interface, node);
1222
1223         if (node_old && node_new) {
1224                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1225                 interface_change_config(if_old, if_new);
1226         } else if (node_old) {
1227                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1228                 set_config_state(if_old, IFC_REMOVE);
1229         } else if (node_new) {
1230                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1231                 proto_init_interface(if_new, if_new->config);
1232                 interface_claim_device(if_new);
1233                 netifd_ubus_add_interface(if_new);
1234         }
1235 }
1236
1237
1238 static void __init
1239 interface_init_list(void)
1240 {
1241         vlist_init(&interfaces, avl_strcmp, interface_update);
1242         interfaces.keep_old = true;
1243         interfaces.no_delete = true;
1244 }