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