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