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_FORCE_LINK,
  47         IFACE_ATTR_MAX
  48 };
  49
  50 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  51         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  57         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  58         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  59         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  61         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  67 };
  68
  69 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  70         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  72 };
  73
  74 const struct uci_blob_param_list interface_attr_list = {
  75         .n_params = IFACE_ATTR_MAX,
  76         .params = iface_attrs,
  77         .info = iface_attr_info,
  78 };
  79
  80 static void
  81 interface_clear_errors(struct interface *iface)
  82 {
  83         struct interface_error *error, *tmp;
  84
  85         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  86                 list_del(&error->list);
  87                 free(error);
  88         }
  89 }
  90
  91 void interface_add_error(struct interface *iface, const char *subsystem,
  92                          const char *code, const char **data, int n_data)
  93 {
  94         struct interface_error *error;
  95         int i, len = 0;
  96         int *datalen = NULL;
  97         char *dest, *d_subsys, *d_code;
  98
  99         if (n_data) {
 100                 len = n_data * sizeof(char *);
 101                 datalen = alloca(len);
 102                 for (i = 0; i < n_data; i++) {
 103                         datalen[i] = strlen(data[i]) + 1;
 104                         len += datalen[i];
 105                 }
 106         }
 107
 108         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 109                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 110                 &d_code, code ? strlen(code) + 1 : 0);
 111         if (!error)
 112                 return;
 113
 114         list_add_tail(&error->list, &iface->errors);
 115
 116         dest = (char *) &error->data[n_data + 1];
 117         for (i = 0; i < n_data; i++) {
 118                 error->data[i] = dest;
 119                 memcpy(dest, data[i], datalen[i]);
 120                 dest += datalen[i];
 121         }
 122         error->data[n_data++] = NULL;
 123
 124         if (subsystem)
 125                 error->subsystem = strcpy(d_subsys, subsystem);
 126
 127         if (code)
 128                 error->code = strcpy(d_code, code);
 129 }
 130
 131 static void
 132 interface_data_del(struct interface *iface, struct interface_data *data)
 133 {
 134         avl_delete(&iface->data, &data->node);
 135         free(data);
 136 }
 137
 138 static void
 139 interface_data_flush(struct interface *iface)
 140 {
 141         struct interface_data *d, *tmp;
 142
 143         avl_for_each_element_safe(&iface->data, d, node, tmp)
 144                 interface_data_del(iface, d);
 145 }
 146
 147 int
 148 interface_add_data(struct interface *iface, const struct blob_attr *data)
 149 {
 150         struct interface_data *n, *o;
 151
 152         if (!blobmsg_check_attr(data, true))
 153                 return UBUS_STATUS_INVALID_ARGUMENT;
 154
 155         const char *name = blobmsg_name(data);
 156         unsigned len = blob_pad_len(data);
 157
 158         o = avl_find_element(&iface->data, name, o, node);
 159         if (o) {
 160                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 161                         return 0;
 162
 163                 interface_data_del(iface, o);
 164         }
 165
 166         n = calloc(1, sizeof(*n) + len);
 167         memcpy(n->data, data, len);
 168         n->node.key = blobmsg_name(n->data);
 169         avl_insert(&iface->data, &n->node);
 170
 171         iface->updated |= IUF_DATA;
 172         return 0;
 173 }
 174
 175 static void
 176 interface_event(struct interface *iface, enum interface_event ev)
 177 {
 178         struct interface_user *dep, *tmp;
 179         struct device *adev = NULL;
 180
 181         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 182                 dep->cb(dep, iface, ev);
 183
 184         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 185                 dep->cb(dep, iface, ev);
 186
 187         switch (ev) {
 188         case IFEV_UP:
 189                 adev = iface->l3_dev.dev;
 190                 /* fall through */
 191         case IFEV_DOWN:
 192                 alias_notify_device(iface->name, adev);
 193                 break;
 194         default:
 195                 break;
 196         }
 197 }
 198
 199 static void
 200 interface_flush_state(struct interface *iface)
 201 {
 202         if (iface->l3_dev.dev)
 203                 device_release(&iface->l3_dev);
 204         interface_data_flush(iface);
 205 }
 206
 207 static void
 208 mark_interface_down(struct interface *iface)
 209 {
 210         enum interface_state state = iface->state;
 211
 212         if (state == IFS_DOWN)
 213                 return;
 214
 215         iface->state = IFS_DOWN;
 216         if (state == IFS_UP)
 217                 interface_event(iface, IFEV_DOWN);
 218         interface_ip_set_enabled(&iface->config_ip, false);
 219         interface_ip_flush(&iface->proto_ip);
 220         interface_flush_state(iface);
 221         system_flush_routes();
 222 }
 223
 224 void
 225 __interface_set_down(struct interface *iface, bool force)
 226 {
 227         enum interface_state state = iface->state;
 228         switch (state) {
 229         case IFS_UP:
 230         case IFS_SETUP:
 231                 iface->state = IFS_TEARDOWN;
 232                 if (state == IFS_UP)
 233                         interface_event(iface, IFEV_DOWN);
 234
 235                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 236                 if (force)
 237                         interface_flush_state(iface);
 238
 239                 if (iface->dynamic)
 240                         vlist_delete(&interfaces, &iface->node);
 241                 break;
 242
 243         case IFS_DOWN:
 244                 if (iface->main_dev.dev)
 245                         device_release(&iface->main_dev);
 246         case IFS_TEARDOWN:
 247         default:
 248                 break;
 249         }
 250 }
 251
 252 static int
 253 __interface_set_up(struct interface *iface)
 254 {
 255         int ret;
 256
 257         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 258
 259         iface->state = IFS_SETUP;
 260         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 261         if (ret)
 262                 mark_interface_down(iface);
 263
 264         return ret;
 265 }
 266
 267 static void
 268 interface_check_state(struct interface *iface)
 269 {
 270         bool link_state = iface->link_state || iface->force_link;
 271
 272         switch (iface->state) {
 273         case IFS_UP:
 274                 if (!iface->enabled || !link_state) {
 275                         mark_interface_down(iface);
 276                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 277                 }
 278                 break;
 279         case IFS_DOWN:
 280                 if (iface->autostart && iface->enabled && link_state && !config_init)
 281                         __interface_set_up(iface);
 282                 break;
 283         default:
 284                 break;
 285         }
 286 }
 287
 288 static void
 289 interface_set_enabled(struct interface *iface, bool new_state)
 290 {
 291         if (iface->enabled == new_state)
 292                 return;
 293
 294         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 295         iface->enabled = new_state;
 296         interface_check_state(iface);
 297 }
 298
 299 static void
 300 interface_set_link_state(struct interface *iface, bool new_state)
 301 {
 302         if (iface->link_state == new_state)
 303                 return;
 304
 305         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 306         iface->link_state = new_state;
 307         interface_check_state(iface);
 308 }
 309
 310 static void
 311 interface_cb(struct device_user *dep, enum device_event ev)
 312 {
 313         struct interface *iface;
 314         bool new_state = false;
 315
 316         iface = container_of(dep, struct interface, main_dev);
 317         switch (ev) {
 318         case DEV_EVENT_ADD:
 319                 new_state = true;
 320         case DEV_EVENT_REMOVE:
 321                 interface_set_available(iface, new_state);
 322                 if (!new_state && dep->dev->external)
 323                         interface_set_main_dev(iface, NULL);
 324                 break;
 325         case DEV_EVENT_UP:
 326                 new_state = true;
 327         case DEV_EVENT_DOWN:
 328                 interface_set_enabled(iface, new_state);
 329                 break;
 330         case DEV_EVENT_LINK_UP:
 331                 new_state = true;
 332         case DEV_EVENT_LINK_DOWN:
 333                 interface_set_link_state(iface, new_state);
 334                 break;
 335         case DEV_EVENT_TOPO_CHANGE:
 336                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 337                 return;
 338         default:
 339                 break;
 340         }
 341 }
 342
 343 void
 344 interface_set_available(struct interface *iface, bool new_state)
 345 {
 346         if (iface->available == new_state)
 347                 return;
 348
 349         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 350         iface->available = new_state;
 351
 352         if (new_state) {
 353                 if (iface->autostart && !config_init)
 354                         interface_set_up(iface);
 355         } else
 356                 __interface_set_down(iface, true);
 357 }
 358
 359 void
 360 interface_add_user(struct interface_user *dep, struct interface *iface)
 361 {
 362         if (!iface) {
 363                 list_add(&dep->list, &iface_all_users);
 364                 return;
 365         }
 366
 367         dep->iface = iface;
 368         list_add(&dep->list, &iface->users);
 369         if (iface->state == IFS_UP)
 370                 dep->cb(dep, iface, IFEV_UP);
 371 }
 372
 373 void
 374 interface_remove_user(struct interface_user *dep)
 375 {
 376         list_del_init(&dep->list);
 377         dep->iface = NULL;
 378 }
 379
 380 static void
 381 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 382 {
 383         struct blob_attr *cur;
 384         int rem;
 385
 386         blobmsg_for_each_attr(cur, list, rem) {
 387                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 388                         continue;
 389
 390                 if (!blobmsg_check_attr(cur, NULL))
 391                         continue;
 392
 393                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 394                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 395                 list_add(&c->head, &iface->assignment_classes);
 396         }
 397 }
 398
 399 static void
 400 interface_clear_assignment_classes(struct interface *iface)
 401 {
 402         while (!list_empty(&iface->assignment_classes)) {
 403                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 404                                 struct interface_assignment_class, head);
 405                 list_del(&c->head);
 406                 free(c);
 407         }
 408 }
 409
 410 static void
 411 interface_merge_assignment_data(struct interface *old, struct interface *new)
 412 {
 413         bool changed = (old->assignment_hint != new->assignment_hint ||
 414                         old->assignment_length != new->assignment_length ||
 415                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 416
 417         struct interface_assignment_class *c;
 418         list_for_each_entry(c, &new->assignment_classes, head) {
 419                 // Compare list entries one-by-one to see if there was a change
 420                 if (list_empty(&old->assignment_classes)) // The new list is longer
 421                         changed = true;
 422
 423                 if (changed)
 424                         break;
 425
 426                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 427                                 struct interface_assignment_class, head);
 428
 429                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 430                         break;
 431
 432                 list_del(&c_old->head);
 433                 free(c_old);
 434         }
 435
 436         // The old list was longer than the new one or the last entry didn't match
 437         if (!list_empty(&old->assignment_classes)) {
 438                 interface_clear_assignment_classes(old);
 439                 changed = true;
 440         }
 441
 442         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 443
 444         if (changed) {
 445                 old->assignment_hint = new->assignment_hint;
 446                 old->assignment_length = new->assignment_length;
 447                 interface_refresh_assignments(true);
 448         }
 449 }
 450
 451 static void
 452 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 453 {
 454         struct interface *alias = container_of(dep, struct interface, parent_iface);
 455         struct device *dev = iface->l3_dev.dev;
 456
 457         switch (ev) {
 458         case IFEV_UP:
 459                 if (!dev)
 460                         return;
 461
 462                 interface_set_main_dev(alias, dev);
 463                 interface_set_available(alias, true);
 464                 break;
 465         case IFEV_DOWN:
 466                 interface_set_available(alias, false);
 467                 interface_set_main_dev(alias, NULL);
 468                 break;
 469         case IFEV_FREE:
 470                 interface_remove_user(dep);
 471                 break;
 472         case IFEV_RELOAD:
 473         case IFEV_UPDATE:
 474                 break;
 475         }
 476 }
 477
 478 static void
 479 interface_claim_device(struct interface *iface)
 480 {
 481         struct interface *parent;
 482         struct device *dev = NULL;
 483
 484         if (iface->parent_iface.iface)
 485                 interface_remove_user(&iface->parent_iface);
 486
 487         if (iface->parent_ifname) {
 488                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 489                 iface->parent_iface.cb = interface_alias_cb;
 490                 interface_add_user(&iface->parent_iface, parent);
 491         } else if (iface->ifname &&
 492                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 493                 dev = device_get(iface->ifname, true);
 494         }
 495
 496         if (dev)
 497                 interface_set_main_dev(iface, dev);
 498
 499         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 500                 interface_set_available(iface, true);
 501 }
 502
 503 static void
 504 interface_cleanup_state(struct interface *iface)
 505 {
 506         interface_set_available(iface, false);
 507
 508         interface_flush_state(iface);
 509         interface_clear_errors(iface);
 510         interface_set_proto_state(iface, NULL);
 511
 512         if (iface->main_dev.dev)
 513                 interface_set_main_dev(iface, NULL);
 514 }
 515
 516 static void
 517 interface_cleanup(struct interface *iface)
 518 {
 519         struct interface_user *dep, *tmp;
 520
 521         if (iface->parent_iface.iface)
 522                 interface_remove_user(&iface->parent_iface);
 523
 524         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 525                 interface_remove_user(dep);
 526
 527         interface_clear_assignment_classes(iface);
 528         interface_ip_flush(&iface->config_ip);
 529         interface_cleanup_state(iface);
 530 }
 531
 532 static void
 533 interface_do_free(struct interface *iface)
 534 {
 535         interface_event(iface, IFEV_FREE);
 536         interface_cleanup(iface);
 537         free(iface->config);
 538         netifd_ubus_remove_interface(iface);
 539         avl_delete(&interfaces.avl, &iface->node.avl);
 540         free(iface);
 541 }
 542
 543 static void
 544 interface_do_reload(struct interface *iface)
 545 {
 546         interface_event(iface, IFEV_RELOAD);
 547         interface_cleanup_state(iface);
 548         proto_init_interface(iface, iface->config);
 549         interface_claim_device(iface);
 550 }
 551
 552 static void
 553 interface_handle_config_change(struct interface *iface)
 554 {
 555         enum interface_config_state state = iface->config_state;
 556
 557         iface->config_state = IFC_NORMAL;
 558         switch(state) {
 559         case IFC_NORMAL:
 560                 break;
 561         case IFC_RELOAD:
 562                 interface_do_reload(iface);
 563                 break;
 564         case IFC_REMOVE:
 565                 interface_do_free(iface);
 566                 return;
 567         }
 568         if (iface->autostart && iface->available)
 569                 interface_set_up(iface);
 570 }
 571
 572 static void
 573 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 574 {
 575         struct interface *iface = state->iface;
 576
 577         switch (ev) {
 578         case IFPEV_UP:
 579                 if (iface->state != IFS_SETUP) {
 580                         interface_event(iface, IFEV_UPDATE);
 581                         return;
 582                 }
 583
 584                 interface_ip_set_enabled(&iface->config_ip, true);
 585                 system_flush_routes();
 586                 iface->state = IFS_UP;
 587                 iface->start_time = system_get_rtime();
 588                 interface_event(iface, IFEV_UP);
 589                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 590                 break;
 591         case IFPEV_DOWN:
 592                 if (iface->state == IFS_DOWN)
 593                         return;
 594
 595                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 596                 mark_interface_down(iface);
 597                 if (iface->main_dev.dev)
 598                         device_release(&iface->main_dev);
 599                 if (iface->l3_dev.dev)
 600                         device_remove_user(&iface->l3_dev);
 601                 interface_handle_config_change(iface);
 602                 break;
 603         case IFPEV_LINK_LOST:
 604                 if (iface->state != IFS_UP)
 605                         return;
 606
 607                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 608                 mark_interface_down(iface);
 609                 iface->state = IFS_SETUP;
 610                 break;
 611         default:
 612                 return;
 613         }
 614
 615         interface_write_resolv_conf();
 616 }
 617
 618 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 619 {
 620         if (iface->proto) {
 621                 iface->proto->free(iface->proto);
 622                 iface->proto = NULL;
 623         }
 624         iface->state = IFS_DOWN;
 625         iface->proto = state;
 626         if (!state)
 627                 return;
 628
 629         state->proto_event = interface_proto_cb;
 630         state->iface = iface;
 631 }
 632
 633 struct interface *
 634 interface_alloc(const char *name, struct blob_attr *config)
 635 {
 636         struct interface *iface;
 637         struct blob_attr *tb[IFACE_ATTR_MAX];
 638         struct blob_attr *cur;
 639         const char *proto_name = NULL;
 640         char *iface_name;
 641
 642         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 643         iface->name = strcpy(iface_name, name);
 644         INIT_LIST_HEAD(&iface->errors);
 645         INIT_LIST_HEAD(&iface->users);
 646         INIT_LIST_HEAD(&iface->hotplug_list);
 647         INIT_LIST_HEAD(&iface->assignment_classes);
 648         interface_ip_init(iface);
 649         avl_init(&iface->data, avl_strcmp, false, NULL);
 650         iface->config_ip.enabled = false;
 651
 652         iface->main_dev.cb = interface_cb;
 653
 654         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 655                       blob_data(config), blob_len(config));
 656
 657         if ((cur = tb[IFACE_ATTR_PROTO]))
 658                 proto_name = blobmsg_data(cur);
 659
 660         proto_attach_interface(iface, proto_name);
 661
 662         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 663         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], false);
 664         iface->proto_ip.no_defaultroute =
 665                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 666         iface->proto_ip.no_dns =
 667                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 668
 669         if ((cur = tb[IFACE_ATTR_DNS]))
 670                 interface_add_dns_server_list(&iface->config_ip, cur);
 671
 672         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 673                 interface_add_dns_search_list(&iface->config_ip, cur);
 674
 675         if ((cur = tb[IFACE_ATTR_METRIC]))
 676                 iface->metric = blobmsg_get_u32(cur);
 677
 678         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 679                 iface->assignment_length = blobmsg_get_u32(cur);
 680
 681         iface->assignment_hint = -1;
 682         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 683                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 684                                 ~((1 << (64 - iface->assignment_length)) - 1);
 685
 686         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 687                 interface_add_assignment_classes(iface, cur);
 688
 689
 690         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 691                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 692                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 693         }
 694
 695         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 696                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 697                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 698         }
 699
 700         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 701
 702         iface->config_autostart = iface->autostart;
 703         return iface;
 704 }
 705
 706 void interface_set_dynamic(struct interface *iface)
 707 {
 708         iface->dynamic = true;
 709         iface->node.version = -1; // Don't delete on reload
 710 }
 711
 712 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 713 {
 714         struct blob_attr *tb[IFACE_ATTR_MAX];
 715         struct blob_attr *cur;
 716
 717         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 718                       blob_data(config), blob_len(config));
 719
 720         if (alias) {
 721                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 722                         iface->parent_ifname = blobmsg_data(cur);
 723
 724                 if (!iface->parent_ifname)
 725                         return false;
 726         } else {
 727                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 728                         iface->ifname = blobmsg_data(cur);
 729         }
 730
 731
 732         iface->config = config;
 733         vlist_add(&interfaces, &iface->node, iface->name);
 734         return true;
 735 }
 736
 737 void
 738 interface_add(struct interface *iface, struct blob_attr *config)
 739 {
 740         __interface_add(iface, config, false);
 741 }
 742
 743 bool
 744 interface_add_alias(struct interface *iface, struct blob_attr *config)
 745 {
 746         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 747                 return false;
 748
 749         return __interface_add(iface, config, true);
 750 }
 751
 752 void
 753 interface_set_l3_dev(struct interface *iface, struct device *dev)
 754 {
 755         bool enabled = iface->config_ip.enabled;
 756         bool claimed = iface->l3_dev.claimed;
 757
 758         if (iface->l3_dev.dev == dev)
 759                 return;
 760
 761         interface_ip_set_enabled(&iface->config_ip, false);
 762         interface_ip_flush(&iface->proto_ip);
 763         device_add_user(&iface->l3_dev, dev);
 764
 765         if (dev) {
 766                 if (claimed)
 767                         device_claim(&iface->l3_dev);
 768                 interface_ip_set_enabled(&iface->config_ip, enabled);
 769         }
 770 }
 771
 772 void
 773 interface_set_main_dev(struct interface *iface, struct device *dev)
 774 {
 775         bool set_l3 = (!dev || iface->main_dev.dev == iface->l3_dev.dev);
 776         bool claimed = iface->l3_dev.claimed;
 777
 778         if (iface->main_dev.dev == dev)
 779                 return;
 780
 781         if (set_l3)
 782                 interface_set_l3_dev(iface, dev);
 783
 784         device_add_user(&iface->main_dev, dev);
 785         if (!dev) {
 786                 interface_set_link_state(iface, false);
 787                 return;
 788         }
 789
 790         if (claimed)
 791                 device_claim(&iface->l3_dev);
 792
 793         if (!iface->l3_dev.dev)
 794                 interface_set_l3_dev(iface, dev);
 795 }
 796
 797 int
 798 interface_remove_link(struct interface *iface, struct device *dev)
 799 {
 800         struct device *mdev = iface->main_dev.dev;
 801
 802         if (mdev && mdev->hotplug_ops)
 803                 return mdev->hotplug_ops->del(mdev, dev);
 804
 805         if (!iface->main_dev.hotplug)
 806                 return UBUS_STATUS_INVALID_ARGUMENT;
 807
 808         if (dev != iface->main_dev.dev)
 809                 return UBUS_STATUS_INVALID_ARGUMENT;
 810
 811         device_remove_user(&iface->main_dev);
 812         return 0;
 813 }
 814
 815 int
 816 interface_add_link(struct interface *iface, struct device *dev)
 817 {
 818         struct device *mdev = iface->main_dev.dev;
 819
 820         if (mdev == dev)
 821                 return 0;
 822
 823         if (iface->main_dev.hotplug)
 824                 device_remove_user(&iface->main_dev);
 825
 826         if (mdev) {
 827                 if (mdev->hotplug_ops)
 828                         return mdev->hotplug_ops->add(mdev, dev);
 829                 else
 830                         return UBUS_STATUS_NOT_SUPPORTED;
 831         }
 832
 833         interface_set_main_dev(iface, dev);
 834         iface->main_dev.hotplug = true;
 835         return 0;
 836 }
 837
 838 int
 839 interface_handle_link(struct interface *iface, const char *name, bool add)
 840 {
 841         struct device *dev;
 842         int ret;
 843
 844         device_lock();
 845
 846         dev = device_get(name, add ? 2 : 0);
 847         if (!dev) {
 848                 ret = UBUS_STATUS_NOT_FOUND;
 849                 goto out;
 850         }
 851
 852         if (add) {
 853                 device_set_present(dev, true);
 854                 if (iface->device_config)
 855                         device_set_config(dev, &simple_device_type, iface->config);
 856
 857                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 858                 ret = interface_add_link(iface, dev);
 859         } else {
 860                 ret = interface_remove_link(iface, dev);
 861         }
 862
 863 out:
 864         device_unlock();
 865
 866         return ret;
 867 }
 868
 869 int
 870 interface_set_up(struct interface *iface)
 871 {
 872         int ret;
 873
 874         iface->autostart = true;
 875
 876         if (iface->state != IFS_DOWN)
 877                 return 0;
 878
 879         interface_clear_errors(iface);
 880         if (!iface->available) {
 881                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 882                 return -1;
 883         }
 884
 885         if (iface->main_dev.dev) {
 886                 ret = device_claim(&iface->main_dev);
 887                 if (!ret)
 888                         interface_check_state(iface);
 889         }
 890         else
 891                 ret = __interface_set_up(iface);
 892
 893         return ret;
 894 }
 895
 896 int
 897 interface_set_down(struct interface *iface)
 898 {
 899         if (!iface) {
 900                 vlist_for_each_element(&interfaces, iface, node)
 901                         __interface_set_down(iface, false);
 902         } else {
 903                 iface->autostart = false;
 904                 __interface_set_down(iface, false);
 905         }
 906
 907         return 0;
 908 }
 909
 910 void
 911 interface_start_pending(void)
 912 {
 913         struct interface *iface;
 914
 915         vlist_for_each_element(&interfaces, iface, node) {
 916                 if (iface->available && iface->autostart)
 917                         interface_set_up(iface);
 918         }
 919 }
 920
 921 static void
 922 set_config_state(struct interface *iface, enum interface_config_state s)
 923 {
 924         iface->config_state = s;
 925         if (iface->state == IFS_DOWN)
 926                 interface_handle_config_change(iface);
 927         else
 928                 __interface_set_down(iface, false);
 929 }
 930
 931 void
 932 interface_update_start(struct interface *iface)
 933 {
 934         iface->updated = 0;
 935         interface_ip_update_start(&iface->proto_ip);
 936 }
 937
 938 void
 939 interface_update_complete(struct interface *iface)
 940 {
 941         interface_ip_update_complete(&iface->proto_ip);
 942 }
 943
 944 static void
 945 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 946 {
 947         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 948         vlist_simple_replace(&new->dns_search, &old->dns_search);
 949 }
 950
 951 static void
 952 interface_change_config(struct interface *if_old, struct interface *if_new)
 953 {
 954         struct blob_attr *old_config = if_old->config;
 955         bool reload = false, reload_ip = false;
 956
 957 #define FIELD_CHANGED_STR(field)                                        \
 958                 ((!!if_old->field != !!if_new->field) ||                \
 959                  (if_old->field &&                                      \
 960                   strcmp(if_old->field, if_new->field) != 0))
 961
 962         if (FIELD_CHANGED_STR(parent_ifname)) {
 963                 if (if_old->parent_iface.iface)
 964                         interface_remove_user(&if_old->parent_iface);
 965                 reload = true;
 966         }
 967
 968         if (FIELD_CHANGED_STR(ifname) ||
 969             if_old->proto_handler != if_new->proto_handler)
 970                 reload = true;
 971
 972         if (!if_old->proto_handler->config_params)
 973                 D(INTERFACE, "No config parameters for interface '%s'\n",
 974                   if_old->name);
 975         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 976                                        if_old->proto_handler->config_params))
 977                 reload = true;
 978
 979 #define UPDATE(field, __var) ({                                         \
 980                 bool __changed = (if_old->field != if_new->field);      \
 981                 if_old->field = if_new->field;                          \
 982                 __var |= __changed;                                     \
 983         })
 984
 985         if_old->config = if_new->config;
 986         if (!if_old->config_autostart && if_new->config_autostart)
 987                 if_old->autostart = true;
 988
 989         if_old->device_config = if_new->device_config;
 990         if_old->config_autostart = if_new->config_autostart;
 991         if_old->ifname = if_new->ifname;
 992         if_old->parent_ifname = if_new->parent_ifname;
 993         if_old->proto_handler = if_new->proto_handler;
 994         if_old->force_link = if_new->force_link;
 995
 996         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 997         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 998
 999         UPDATE(metric, reload_ip);
1000         UPDATE(proto_ip.no_defaultroute, reload_ip);
1001         UPDATE(ip4table, reload_ip);
1002         UPDATE(ip6table, reload_ip);
1003         interface_merge_assignment_data(if_old, if_new);
1004
1005 #undef UPDATE
1006
1007         if (reload) {
1008                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1009                   if_old->name);
1010                 interface_clear_errors(if_old);
1011                 set_config_state(if_old, IFC_RELOAD);
1012                 goto out;
1013         }
1014
1015         if (reload_ip) {
1016                 interface_ip_set_enabled(&if_old->config_ip, false);
1017                 interface_ip_set_enabled(&if_old->proto_ip, false);
1018                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
1019                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
1020         }
1021
1022         interface_write_resolv_conf();
1023         interface_check_state(if_old);
1024
1025 out:
1026         if_new->config = NULL;
1027         interface_cleanup(if_new);
1028         free(old_config);
1029         free(if_new);
1030 }
1031
1032 static void
1033 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1034                  struct vlist_node *node_old)
1035 {
1036         struct interface *if_old = container_of(node_old, struct interface, node);
1037         struct interface *if_new = container_of(node_new, struct interface, node);
1038
1039         if (node_old && node_new) {
1040                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1041                 interface_change_config(if_old, if_new);
1042         } else if (node_old) {
1043                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1044                 set_config_state(if_old, IFC_REMOVE);
1045         } else if (node_new) {
1046                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1047                 proto_init_interface(if_new, if_new->config);
1048                 interface_claim_device(if_new);
1049                 netifd_ubus_add_interface(if_new);
1050         }
1051 }
1052
1053
1054 static void __init
1055 interface_init_list(void)
1056 {
1057         vlist_init(&interfaces, avl_strcmp, interface_update);
1058         interfaces.keep_old = true;
1059         interfaces.no_delete = true;
1060 }