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 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  72         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  74 };
  75
  76 const struct uci_blob_param_list interface_attr_list = {
  77         .n_params = IFACE_ATTR_MAX,
  78         .params = iface_attrs,
  79         .info = iface_attr_info,
  80 };
  81
  82 static void
  83 interface_error_flush(struct interface *iface)
  84 {
  85         struct interface_error *error, *tmp;
  86
  87         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  88                 list_del(&error->list);
  89                 free(error);
  90         }
  91 }
  92
  93 static void
  94 interface_clear_errors(struct interface *iface)
  95 {
  96         /* don't flush the errors in case the configured protocol handler matches the
  97            running protocol handler and is having the last error capability */
  98         if (!(iface->proto &&
  99               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 100               (iface->proto->handler->name == iface->proto_handler->name)))
 101                 interface_error_flush(iface);
 102 }
 103
 104 void interface_add_error(struct interface *iface, const char *subsystem,
 105                          const char *code, const char **data, int n_data)
 106 {
 107         struct interface_error *error;
 108         int i, len = 0;
 109         int *datalen = NULL;
 110         char *dest, *d_subsys, *d_code;
 111
 112         /* if the configured protocol handler has the last error support capability,
 113            errors should only be added if the running protocol handler matches the
 114            configured one */
 115         if (iface->proto &&
 116             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 117             (iface->proto->handler->name != iface->proto_handler->name))
 118                 return;
 119
 120         if (n_data) {
 121                 len = n_data * sizeof(char *);
 122                 datalen = alloca(len);
 123                 for (i = 0; i < n_data; i++) {
 124                         datalen[i] = strlen(data[i]) + 1;
 125                         len += datalen[i];
 126                 }
 127         }
 128
 129         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 130                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 131                 &d_code, code ? strlen(code) + 1 : 0);
 132         if (!error)
 133                 return;
 134
 135         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 136            protocol can't be established (e.g auth failure) */
 137         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 138                 interface_error_flush(iface);
 139
 140         list_add_tail(&error->list, &iface->errors);
 141
 142         dest = (char *) &error->data[n_data + 1];
 143         for (i = 0; i < n_data; i++) {
 144                 error->data[i] = dest;
 145                 memcpy(dest, data[i], datalen[i]);
 146                 dest += datalen[i];
 147         }
 148         error->data[n_data++] = NULL;
 149
 150         if (subsystem)
 151                 error->subsystem = strcpy(d_subsys, subsystem);
 152
 153         if (code)
 154                 error->code = strcpy(d_code, code);
 155 }
 156
 157 static void
 158 interface_data_del(struct interface *iface, struct interface_data *data)
 159 {
 160         avl_delete(&iface->data, &data->node);
 161         free(data);
 162 }
 163
 164 static void
 165 interface_data_flush(struct interface *iface)
 166 {
 167         struct interface_data *d, *tmp;
 168
 169         avl_for_each_element_safe(&iface->data, d, node, tmp)
 170                 interface_data_del(iface, d);
 171 }
 172
 173 int
 174 interface_add_data(struct interface *iface, const struct blob_attr *data)
 175 {
 176         struct interface_data *n, *o;
 177
 178         if (!blobmsg_check_attr(data, true))
 179                 return UBUS_STATUS_INVALID_ARGUMENT;
 180
 181         const char *name = blobmsg_name(data);
 182         unsigned len = blob_pad_len(data);
 183
 184         o = avl_find_element(&iface->data, name, o, node);
 185         if (o) {
 186                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 187                         return 0;
 188
 189                 interface_data_del(iface, o);
 190         }
 191
 192         n = calloc(1, sizeof(*n) + len);
 193         memcpy(n->data, data, len);
 194         n->node.key = blobmsg_name(n->data);
 195         avl_insert(&iface->data, &n->node);
 196
 197         iface->updated |= IUF_DATA;
 198         return 0;
 199 }
 200
 201 static void
 202 interface_event(struct interface *iface, enum interface_event ev)
 203 {
 204         struct interface_user *dep, *tmp;
 205         struct device *adev = NULL;
 206
 207         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 208                 dep->cb(dep, iface, ev);
 209
 210         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 211                 dep->cb(dep, iface, ev);
 212
 213         switch (ev) {
 214         case IFEV_UP:
 215                 interface_error_flush(iface);
 216                 adev = iface->l3_dev.dev;
 217                 /* fall through */
 218         case IFEV_DOWN:
 219                 alias_notify_device(iface->name, adev);
 220                 break;
 221         default:
 222                 break;
 223         }
 224 }
 225
 226 static void
 227 interface_flush_state(struct interface *iface)
 228 {
 229         if (iface->l3_dev.dev)
 230                 device_release(&iface->l3_dev);
 231         interface_data_flush(iface);
 232 }
 233
 234 static void
 235 mark_interface_down(struct interface *iface)
 236 {
 237         enum interface_state state = iface->state;
 238
 239         if (state == IFS_DOWN)
 240                 return;
 241
 242         iface->state = IFS_DOWN;
 243         if (state == IFS_UP)
 244                 interface_event(iface, IFEV_DOWN);
 245         interface_ip_set_enabled(&iface->config_ip, false);
 246         interface_ip_flush(&iface->proto_ip);
 247         interface_flush_state(iface);
 248         system_flush_routes();
 249 }
 250
 251 void
 252 __interface_set_down(struct interface *iface, bool force)
 253 {
 254         enum interface_state state = iface->state;
 255         switch (state) {
 256         case IFS_UP:
 257         case IFS_SETUP:
 258                 iface->state = IFS_TEARDOWN;
 259                 if (state == IFS_UP)
 260                         interface_event(iface, IFEV_DOWN);
 261
 262                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 263                 if (force)
 264                         interface_flush_state(iface);
 265
 266                 if (iface->dynamic)
 267                         vlist_delete(&interfaces, &iface->node);
 268                 break;
 269
 270         case IFS_DOWN:
 271                 if (iface->main_dev.dev)
 272                         device_release(&iface->main_dev);
 273         case IFS_TEARDOWN:
 274         default:
 275                 break;
 276         }
 277 }
 278
 279 static int
 280 __interface_set_up(struct interface *iface)
 281 {
 282         int ret;
 283
 284         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 285
 286         iface->state = IFS_SETUP;
 287         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 288         if (ret)
 289                 mark_interface_down(iface);
 290
 291         return ret;
 292 }
 293
 294 static void
 295 interface_check_state(struct interface *iface)
 296 {
 297         bool link_state = iface->link_state || iface->force_link;
 298
 299         switch (iface->state) {
 300         case IFS_UP:
 301         case IFS_SETUP:
 302                 if (!iface->enabled || !link_state) {
 303                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 304                         mark_interface_down(iface);
 305                 }
 306                 break;
 307         case IFS_DOWN:
 308                 if (!iface->available)
 309                         return;
 310
 311                 if (iface->autostart && iface->enabled && link_state && !config_init)
 312                         __interface_set_up(iface);
 313                 break;
 314         default:
 315                 break;
 316         }
 317 }
 318
 319 static void
 320 interface_set_enabled(struct interface *iface, bool new_state)
 321 {
 322         if (iface->enabled == new_state)
 323                 return;
 324
 325         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 326         iface->enabled = new_state;
 327         interface_check_state(iface);
 328 }
 329
 330 static void
 331 interface_set_link_state(struct interface *iface, bool new_state)
 332 {
 333         if (iface->link_state == new_state)
 334                 return;
 335
 336         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 337         iface->link_state = new_state;
 338         interface_check_state(iface);
 339 }
 340
 341 static void
 342 interface_ext_cb(struct device_user *dep, enum device_event ev)
 343 {
 344         if (ev == DEV_EVENT_REMOVE)
 345                 device_remove_user(dep);
 346 }
 347
 348 static void
 349 interface_cb(struct device_user *dep, enum device_event ev)
 350 {
 351         struct interface *iface;
 352         bool new_state = false;
 353
 354         iface = container_of(dep, struct interface, main_dev);
 355         switch (ev) {
 356         case DEV_EVENT_ADD:
 357                 new_state = true;
 358         case DEV_EVENT_REMOVE:
 359                 interface_set_available(iface, new_state);
 360                 if (!new_state && dep->dev && dep->dev->external)
 361                         interface_set_main_dev(iface, NULL);
 362                 break;
 363         case DEV_EVENT_UP:
 364                 new_state = true;
 365         case DEV_EVENT_DOWN:
 366                 interface_set_enabled(iface, new_state);
 367                 break;
 368         case DEV_EVENT_LINK_UP:
 369                 new_state = true;
 370         case DEV_EVENT_LINK_DOWN:
 371                 interface_set_link_state(iface, new_state);
 372                 break;
 373         case DEV_EVENT_TOPO_CHANGE:
 374                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 375                 return;
 376         default:
 377                 break;
 378         }
 379 }
 380
 381 void
 382 interface_set_available(struct interface *iface, bool new_state)
 383 {
 384         if (iface->available == new_state)
 385                 return;
 386
 387         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 388         iface->available = new_state;
 389
 390         if (new_state) {
 391                 if (iface->autostart && !config_init)
 392                         interface_set_up(iface);
 393         } else
 394                 __interface_set_down(iface, true);
 395 }
 396
 397 void
 398 interface_add_user(struct interface_user *dep, struct interface *iface)
 399 {
 400         if (!iface) {
 401                 list_add(&dep->list, &iface_all_users);
 402                 return;
 403         }
 404
 405         dep->iface = iface;
 406         list_add(&dep->list, &iface->users);
 407         if (iface->state == IFS_UP)
 408                 dep->cb(dep, iface, IFEV_UP);
 409 }
 410
 411 void
 412 interface_remove_user(struct interface_user *dep)
 413 {
 414         list_del_init(&dep->list);
 415         dep->iface = NULL;
 416 }
 417
 418 static void
 419 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 420 {
 421         struct blob_attr *cur;
 422         int rem;
 423
 424         blobmsg_for_each_attr(cur, list, rem) {
 425                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 426                         continue;
 427
 428                 if (!blobmsg_check_attr(cur, NULL))
 429                         continue;
 430
 431                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 432                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 433                 list_add(&c->head, &iface->assignment_classes);
 434         }
 435 }
 436
 437 static void
 438 interface_clear_assignment_classes(struct interface *iface)
 439 {
 440         while (!list_empty(&iface->assignment_classes)) {
 441                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 442                                 struct interface_assignment_class, head);
 443                 list_del(&c->head);
 444                 free(c);
 445         }
 446 }
 447
 448 static void
 449 interface_merge_assignment_data(struct interface *old, struct interface *new)
 450 {
 451         bool changed = (old->assignment_hint != new->assignment_hint ||
 452                         old->assignment_length != new->assignment_length ||
 453                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 454                         (old->assignment_iface_id_selection == IFID_FIXED &&
 455                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 456                                 sizeof(old->assignment_fixed_iface_id))) ||
 457                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 458
 459         struct interface_assignment_class *c;
 460         list_for_each_entry(c, &new->assignment_classes, head) {
 461                 // Compare list entries one-by-one to see if there was a change
 462                 if (list_empty(&old->assignment_classes)) // The new list is longer
 463                         changed = true;
 464
 465                 if (changed)
 466                         break;
 467
 468                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 469                                 struct interface_assignment_class, head);
 470
 471                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 472                         break;
 473
 474                 list_del(&c_old->head);
 475                 free(c_old);
 476         }
 477
 478         // The old list was longer than the new one or the last entry didn't match
 479         if (!list_empty(&old->assignment_classes)) {
 480                 interface_clear_assignment_classes(old);
 481                 changed = true;
 482         }
 483
 484         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 485
 486         if (changed) {
 487                 old->assignment_hint = new->assignment_hint;
 488                 old->assignment_length = new->assignment_length;
 489                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 490                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 491                 interface_refresh_assignments(true);
 492         }
 493 }
 494
 495 static void
 496 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 497 {
 498         struct interface *alias = container_of(dep, struct interface, parent_iface);
 499         struct device *dev = iface->l3_dev.dev;
 500
 501         switch (ev) {
 502         case IFEV_UP:
 503                 if (!dev)
 504                         return;
 505
 506                 interface_set_main_dev(alias, dev);
 507                 interface_set_available(alias, true);
 508                 break;
 509         case IFEV_DOWN:
 510                 interface_set_available(alias, false);
 511                 interface_set_main_dev(alias, NULL);
 512                 break;
 513         case IFEV_FREE:
 514                 interface_remove_user(dep);
 515                 break;
 516         case IFEV_RELOAD:
 517         case IFEV_UPDATE:
 518                 break;
 519         }
 520 }
 521
 522 static void
 523 interface_set_device_config(struct interface *iface, struct device *dev)
 524 {
 525         if (!dev || !dev->default_config)
 526                 return;
 527
 528         if (!iface->device_config && !dev->iface_config)
 529                 return;
 530
 531         dev->iface_config = iface->device_config;
 532         device_apply_config(dev, dev->type, iface->config);
 533 }
 534
 535 static void
 536 interface_claim_device(struct interface *iface)
 537 {
 538         struct interface *parent;
 539         struct device *dev = NULL;
 540
 541         if (iface->parent_iface.iface)
 542                 interface_remove_user(&iface->parent_iface);
 543
 544         if (iface->parent_ifname) {
 545                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 546                 iface->parent_iface.cb = interface_alias_cb;
 547                 interface_add_user(&iface->parent_iface, parent);
 548         } else if (iface->ifname &&
 549                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 550                 dev = device_get(iface->ifname, true);
 551                 interface_set_device_config(iface, dev);
 552         } else {
 553                 dev = iface->ext_dev.dev;
 554         }
 555
 556         if (dev)
 557                 interface_set_main_dev(iface, dev);
 558
 559         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 560                 interface_set_available(iface, true);
 561 }
 562
 563 static void
 564 interface_cleanup_state(struct interface *iface)
 565 {
 566         interface_set_available(iface, false);
 567
 568         interface_flush_state(iface);
 569         interface_clear_errors(iface);
 570         interface_set_proto_state(iface, NULL);
 571
 572         interface_set_main_dev(iface, NULL);
 573         interface_set_l3_dev(iface, NULL);
 574 }
 575
 576 static void
 577 interface_cleanup(struct interface *iface)
 578 {
 579         struct interface_user *dep, *tmp;
 580
 581         uloop_timeout_cancel(&iface->remove_timer);
 582         device_remove_user(&iface->ext_dev);
 583
 584         if (iface->parent_iface.iface)
 585                 interface_remove_user(&iface->parent_iface);
 586
 587         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 588                 interface_remove_user(dep);
 589
 590         interface_clear_assignment_classes(iface);
 591         interface_ip_flush(&iface->config_ip);
 592         interface_cleanup_state(iface);
 593 }
 594
 595 static void
 596 interface_do_free(struct interface *iface)
 597 {
 598         interface_event(iface, IFEV_FREE);
 599         interface_cleanup(iface);
 600         free(iface->config);
 601         netifd_ubus_remove_interface(iface);
 602         avl_delete(&interfaces.avl, &iface->node.avl);
 603         free(iface);
 604 }
 605
 606 static void
 607 interface_do_reload(struct interface *iface)
 608 {
 609         interface_event(iface, IFEV_RELOAD);
 610         interface_cleanup_state(iface);
 611         proto_init_interface(iface, iface->config);
 612         interface_claim_device(iface);
 613 }
 614
 615 static void
 616 interface_handle_config_change(struct interface *iface)
 617 {
 618         enum interface_config_state state = iface->config_state;
 619
 620         iface->config_state = IFC_NORMAL;
 621         switch(state) {
 622         case IFC_NORMAL:
 623                 break;
 624         case IFC_RELOAD:
 625                 interface_do_reload(iface);
 626                 break;
 627         case IFC_REMOVE:
 628                 interface_do_free(iface);
 629                 return;
 630         }
 631         if (iface->autostart && iface->available)
 632                 interface_set_up(iface);
 633 }
 634
 635 static void
 636 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 637 {
 638         struct interface *iface = state->iface;
 639
 640         switch (ev) {
 641         case IFPEV_UP:
 642                 if (iface->state != IFS_SETUP) {
 643                         interface_event(iface, IFEV_UPDATE);
 644                         return;
 645                 }
 646
 647                 if (!iface->l3_dev.dev)
 648                         interface_set_l3_dev(iface, iface->main_dev.dev);
 649
 650                 interface_ip_set_enabled(&iface->config_ip, true);
 651                 system_flush_routes();
 652                 iface->state = IFS_UP;
 653                 iface->start_time = system_get_rtime();
 654                 interface_event(iface, IFEV_UP);
 655                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 656                 break;
 657         case IFPEV_DOWN:
 658                 if (iface->state == IFS_DOWN)
 659                         return;
 660
 661                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 662                 mark_interface_down(iface);
 663                 if (iface->main_dev.dev)
 664                         device_release(&iface->main_dev);
 665                 if (iface->l3_dev.dev)
 666                         device_remove_user(&iface->l3_dev);
 667                 interface_handle_config_change(iface);
 668                 break;
 669         case IFPEV_LINK_LOST:
 670                 if (iface->state != IFS_UP)
 671                         return;
 672
 673                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 674                 mark_interface_down(iface);
 675                 iface->state = IFS_SETUP;
 676                 break;
 677         default:
 678                 return;
 679         }
 680
 681         interface_write_resolv_conf();
 682 }
 683
 684 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 685 {
 686         if (iface->proto) {
 687                 iface->proto->free(iface->proto);
 688                 iface->proto = NULL;
 689         }
 690         iface->state = IFS_DOWN;
 691         iface->proto = state;
 692         if (!state)
 693                 return;
 694
 695         state->proto_event = interface_proto_cb;
 696         state->iface = iface;
 697 }
 698
 699 struct interface *
 700 interface_alloc(const char *name, struct blob_attr *config)
 701 {
 702         struct interface *iface;
 703         struct blob_attr *tb[IFACE_ATTR_MAX];
 704         struct blob_attr *cur;
 705         const char *proto_name = NULL;
 706         char *iface_name;
 707         bool force_link = false;
 708
 709         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 710         iface->name = strcpy(iface_name, name);
 711         INIT_LIST_HEAD(&iface->errors);
 712         INIT_LIST_HEAD(&iface->users);
 713         INIT_LIST_HEAD(&iface->hotplug_list);
 714         INIT_LIST_HEAD(&iface->assignment_classes);
 715         interface_ip_init(iface);
 716         avl_init(&iface->data, avl_strcmp, false, NULL);
 717         iface->config_ip.enabled = false;
 718
 719         iface->main_dev.cb = interface_cb;
 720         iface->ext_dev.cb = interface_ext_cb;
 721
 722         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 723                       blob_data(config), blob_len(config));
 724
 725         if ((cur = tb[IFACE_ATTR_PROTO]))
 726                 proto_name = blobmsg_data(cur);
 727
 728         proto_attach_interface(iface, proto_name);
 729         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 730                 force_link = true;
 731
 732         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 733         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 734         iface->proto_ip.no_defaultroute =
 735                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 736         iface->proto_ip.no_dns =
 737                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 738
 739         if ((cur = tb[IFACE_ATTR_DNS]))
 740                 interface_add_dns_server_list(&iface->config_ip, cur);
 741
 742         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 743                 interface_add_dns_search_list(&iface->config_ip, cur);
 744
 745         if ((cur = tb[IFACE_ATTR_METRIC]))
 746                 iface->metric = blobmsg_get_u32(cur);
 747
 748         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 749                 iface->assignment_length = blobmsg_get_u32(cur);
 750
 751         /* defaults */
 752         iface->assignment_iface_id_selection = IFID_FIXED;
 753         iface->assignment_fixed_iface_id = in6addr_any;
 754         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 755
 756         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 757                 const char *ifaceid = blobmsg_data(cur);
 758                 if (!strcmp(ifaceid, "random")) {
 759                         iface->assignment_iface_id_selection = IFID_RANDOM;
 760                 }
 761                 else if (!strcmp(ifaceid, "eui64")) {
 762                         iface->assignment_iface_id_selection = IFID_EUI64;
 763                 }
 764                 else {
 765                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 766                            if we cannot parse -> revert to iface id 1 */
 767                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 768                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 769                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 770                                 iface->assignment_fixed_iface_id = in6addr_any;
 771                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 772                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 773                                                         falling back to iface id 1.\n", iface->name);
 774                         }
 775                 }
 776         }
 777
 778         iface->assignment_hint = -1;
 779         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 780                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 781                                 ~((1 << (64 - iface->assignment_length)) - 1);
 782
 783         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 784                 interface_add_assignment_classes(iface, cur);
 785
 786
 787         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 788                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 789                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 790         }
 791
 792         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 793                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 794                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 795         }
 796
 797         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 798
 799         iface->config_autostart = iface->autostart;
 800         return iface;
 801 }
 802
 803 void interface_set_dynamic(struct interface *iface)
 804 {
 805         iface->dynamic = true;
 806         iface->autostart = true;
 807         iface->node.version = -1; // Don't delete on reload
 808 }
 809
 810 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 811 {
 812         struct blob_attr *tb[IFACE_ATTR_MAX];
 813         struct blob_attr *cur;
 814
 815         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 816                       blob_data(config), blob_len(config));
 817
 818         if (alias) {
 819                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 820                         iface->parent_ifname = blobmsg_data(cur);
 821
 822                 if (!iface->parent_ifname)
 823                         return false;
 824         } else {
 825                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 826                         iface->ifname = blobmsg_data(cur);
 827         }
 828
 829
 830         iface->config = config;
 831         vlist_add(&interfaces, &iface->node, iface->name);
 832         return true;
 833 }
 834
 835 void
 836 interface_add(struct interface *iface, struct blob_attr *config)
 837 {
 838         __interface_add(iface, config, false);
 839 }
 840
 841 bool
 842 interface_add_alias(struct interface *iface, struct blob_attr *config)
 843 {
 844         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 845                 return false;
 846
 847         return __interface_add(iface, config, true);
 848 }
 849
 850 void
 851 interface_set_l3_dev(struct interface *iface, struct device *dev)
 852 {
 853         bool enabled = iface->config_ip.enabled;
 854         bool claimed = iface->l3_dev.claimed;
 855
 856         if (iface->l3_dev.dev == dev)
 857                 return;
 858
 859         interface_ip_set_enabled(&iface->config_ip, false);
 860         interface_ip_flush(&iface->proto_ip);
 861         device_add_user(&iface->l3_dev, dev);
 862
 863         if (dev) {
 864                 if (claimed) {
 865                         if (device_claim(&iface->l3_dev) < 0)
 866                                 return;
 867                 }
 868                 interface_ip_set_enabled(&iface->config_ip, enabled);
 869         }
 870 }
 871
 872 void
 873 interface_set_main_dev(struct interface *iface, struct device *dev)
 874 {
 875         bool claimed = iface->l3_dev.claimed;
 876
 877         if (iface->main_dev.dev == dev)
 878                 return;
 879
 880         interface_set_available(iface, false);
 881         device_add_user(&iface->main_dev, dev);
 882         if (!dev) {
 883                 interface_set_link_state(iface, false);
 884                 return;
 885         }
 886
 887         if (claimed) {
 888                 if (device_claim(&iface->l3_dev) < 0)
 889                         return;
 890         }
 891
 892         if (!iface->l3_dev.dev)
 893                 interface_set_l3_dev(iface, dev);
 894 }
 895
 896 int
 897 interface_remove_link(struct interface *iface, struct device *dev)
 898 {
 899         struct device *mdev = iface->main_dev.dev;
 900
 901         if (mdev && mdev->hotplug_ops)
 902                 return mdev->hotplug_ops->del(mdev, dev);
 903
 904         if (dev == iface->ext_dev.dev)
 905                 device_remove_user(&iface->ext_dev);
 906
 907         if (!iface->main_dev.hotplug)
 908                 return UBUS_STATUS_INVALID_ARGUMENT;
 909
 910         if (dev != iface->main_dev.dev)
 911                 return UBUS_STATUS_INVALID_ARGUMENT;
 912
 913         interface_set_main_dev(iface, NULL);
 914         return 0;
 915 }
 916
 917 static int
 918 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 919 {
 920         struct device *mdev = iface->main_dev.dev;
 921
 922         if (mdev == dev)
 923                 return 0;
 924
 925         if (iface->main_dev.hotplug)
 926                 device_remove_user(&iface->main_dev);
 927
 928         if (mdev) {
 929                 if (mdev->hotplug_ops)
 930                         return mdev->hotplug_ops->add(mdev, dev);
 931                 else
 932                         return UBUS_STATUS_NOT_SUPPORTED;
 933         }
 934
 935         if (link_ext)
 936                 device_add_user(&iface->ext_dev, dev);
 937
 938         interface_set_main_dev(iface, dev);
 939         iface->main_dev.hotplug = true;
 940         return 0;
 941 }
 942
 943 int
 944 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 945 {
 946         struct device *dev;
 947         int ret;
 948
 949         device_lock();
 950
 951         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
 952         if (!dev) {
 953                 ret = UBUS_STATUS_NOT_FOUND;
 954                 goto out;
 955         }
 956
 957         if (add) {
 958                 interface_set_device_config(iface, dev);
 959                 device_set_present(dev, true);
 960
 961                 ret = interface_add_link(iface, dev, link_ext);
 962         } else {
 963                 ret = interface_remove_link(iface, dev);
 964         }
 965
 966 out:
 967         device_unlock();
 968
 969         return ret;
 970 }
 971
 972 int
 973 interface_set_up(struct interface *iface)
 974 {
 975         int ret;
 976
 977         iface->autostart = true;
 978
 979         if (iface->state != IFS_DOWN)
 980                 return 0;
 981
 982         interface_clear_errors(iface);
 983         if (!iface->available) {
 984                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 985                 return -1;
 986         }
 987
 988         if (iface->main_dev.dev) {
 989                 ret = device_claim(&iface->main_dev);
 990                 if (!ret)
 991                         interface_check_state(iface);
 992         }
 993         else
 994                 ret = __interface_set_up(iface);
 995
 996         return ret;
 997 }
 998
 999 int
1000 interface_set_down(struct interface *iface)
1001 {
1002         if (!iface) {
1003                 vlist_for_each_element(&interfaces, iface, node)
1004                         __interface_set_down(iface, false);
1005         } else {
1006                 iface->autostart = false;
1007                 __interface_set_down(iface, false);
1008         }
1009
1010         return 0;
1011 }
1012
1013 void
1014 interface_start_pending(void)
1015 {
1016         struct interface *iface;
1017
1018         vlist_for_each_element(&interfaces, iface, node) {
1019                 if (iface->available && iface->autostart)
1020                         interface_set_up(iface);
1021         }
1022 }
1023
1024 static void
1025 set_config_state(struct interface *iface, enum interface_config_state s)
1026 {
1027         iface->config_state = s;
1028         if (iface->state == IFS_DOWN)
1029                 interface_handle_config_change(iface);
1030         else
1031                 __interface_set_down(iface, false);
1032 }
1033
1034 void
1035 interface_update_start(struct interface *iface)
1036 {
1037         iface->updated = 0;
1038         interface_ip_update_start(&iface->proto_ip);
1039 }
1040
1041 void
1042 interface_update_complete(struct interface *iface)
1043 {
1044         interface_ip_update_complete(&iface->proto_ip);
1045 }
1046
1047 static void
1048 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1049 {
1050         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1051         vlist_simple_replace(&new->dns_search, &old->dns_search);
1052 }
1053
1054 static bool
1055 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1056 {
1057         struct blob_attr *ntb[__DEV_ATTR_MAX];
1058         struct blob_attr *otb[__DEV_ATTR_MAX];
1059         struct device *dev = if_old->main_dev.dev;
1060         unsigned long diff;
1061
1062         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1063
1064         if (!dev)
1065                 return false;
1066
1067         if (if_old->device_config != if_new->device_config)
1068                 return true;
1069
1070         if (!if_new->device_config)
1071                 return false;
1072
1073         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1074                 blob_data(if_old->config), blob_len(if_old->config));
1075
1076         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1077                 blob_data(if_new->config), blob_len(if_new->config));
1078
1079         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1080         return diff;
1081 }
1082
1083 static void
1084 interface_change_config(struct interface *if_old, struct interface *if_new)
1085 {
1086         struct blob_attr *old_config = if_old->config;
1087         bool reload = false, reload_ip = false;
1088
1089 #define FIELD_CHANGED_STR(field)                                        \
1090                 ((!!if_old->field != !!if_new->field) ||                \
1091                  (if_old->field &&                                      \
1092                   strcmp(if_old->field, if_new->field) != 0))
1093
1094         if (FIELD_CHANGED_STR(parent_ifname)) {
1095                 if (if_old->parent_iface.iface)
1096                         interface_remove_user(&if_old->parent_iface);
1097                 reload = true;
1098         }
1099
1100         if (!reload && interface_device_config_changed(if_old, if_new))
1101                 reload = true;
1102
1103         if (FIELD_CHANGED_STR(ifname) ||
1104             if_old->proto_handler != if_new->proto_handler)
1105                 reload = true;
1106
1107         if (!if_old->proto_handler->config_params)
1108                 D(INTERFACE, "No config parameters for interface '%s'\n",
1109                   if_old->name);
1110         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1111                                        if_old->proto_handler->config_params))
1112                 reload = true;
1113
1114 #define UPDATE(field, __var) ({                                         \
1115                 bool __changed = (if_old->field != if_new->field);      \
1116                 if_old->field = if_new->field;                          \
1117                 __var |= __changed;                                     \
1118         })
1119
1120         if_old->config = if_new->config;
1121         if (if_old->config_autostart != if_new->config_autostart) {
1122                 if (if_old->config_autostart)
1123                         reload = true;
1124
1125                 if_old->autostart = if_new->config_autostart;
1126         }
1127
1128         if_old->device_config = if_new->device_config;
1129         if_old->config_autostart = if_new->config_autostart;
1130         if_old->ifname = if_new->ifname;
1131         if_old->parent_ifname = if_new->parent_ifname;
1132         if_old->proto_handler = if_new->proto_handler;
1133         if_old->force_link = if_new->force_link;
1134
1135         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1136         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1137
1138         UPDATE(metric, reload_ip);
1139         UPDATE(proto_ip.no_defaultroute, reload_ip);
1140         UPDATE(ip4table, reload_ip);
1141         UPDATE(ip6table, reload_ip);
1142         interface_merge_assignment_data(if_old, if_new);
1143
1144 #undef UPDATE
1145
1146         if (reload) {
1147                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1148                   if_old->name);
1149                 interface_clear_errors(if_old);
1150                 set_config_state(if_old, IFC_RELOAD);
1151                 goto out;
1152         }
1153
1154         if (reload_ip) {
1155                 bool config_ip_enabled = if_old->config_ip.enabled;
1156                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1157
1158                 interface_ip_set_enabled(&if_old->config_ip, false);
1159                 interface_ip_set_enabled(&if_old->proto_ip, false);
1160                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1161                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1162         }
1163
1164         interface_write_resolv_conf();
1165         if (if_old->main_dev.dev)
1166                 interface_check_state(if_old);
1167
1168 out:
1169         if_new->config = NULL;
1170         interface_cleanup(if_new);
1171         free(old_config);
1172         free(if_new);
1173 }
1174
1175 static void
1176 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1177                  struct vlist_node *node_old)
1178 {
1179         struct interface *if_old = container_of(node_old, struct interface, node);
1180         struct interface *if_new = container_of(node_new, struct interface, node);
1181
1182         if (node_old && node_new) {
1183                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1184                 interface_change_config(if_old, if_new);
1185         } else if (node_old) {
1186                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1187                 set_config_state(if_old, IFC_REMOVE);
1188         } else if (node_new) {
1189                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1190                 proto_init_interface(if_new, if_new->config);
1191                 interface_claim_device(if_new);
1192                 netifd_ubus_add_interface(if_new);
1193         }
1194 }
1195
1196
1197 static void __init
1198 interface_init_list(void)
1199 {
1200         vlist_init(&interfaces, avl_strcmp, interface_update);
1201         interfaces.keep_old = true;
1202         interfaces.no_delete = true;
1203 }