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