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_DNS_METRIC,
  39         IFACE_ATTR_METRIC,
  40         IFACE_ATTR_INTERFACE,
  41         IFACE_ATTR_IP6ASSIGN,
  42         IFACE_ATTR_IP6HINT,
  43         IFACE_ATTR_IP4TABLE,
  44         IFACE_ATTR_IP6TABLE,
  45         IFACE_ATTR_IP6CLASS,
  46         IFACE_ATTR_DELEGATE,
  47         IFACE_ATTR_IP6IFACEID,
  48         IFACE_ATTR_FORCE_LINK,
  49         IFACE_ATTR_IP6WEIGHT,
  50         IFACE_ATTR_MAX
  51 };
  52
  53 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  54         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  55         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  56         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  57         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  58         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  59         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  60         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  61         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  62         [IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
  63         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  65         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  69         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  70         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
  73 };
  74
  75 const struct uci_blob_param_list interface_attr_list = {
  76         .n_params = IFACE_ATTR_MAX,
  77         .params = iface_attrs,
  78 };
  79
  80 static void
  81 set_config_state(struct interface *iface, enum interface_config_state s);
  82 static void
  83 interface_event(struct interface *iface, enum interface_event ev);
  84
  85 static void
  86 interface_error_flush(struct interface *iface)
  87 {
  88         struct interface_error *error, *tmp;
  89
  90         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  91                 list_del(&error->list);
  92                 free(error);
  93         }
  94 }
  95
  96 static void
  97 interface_clear_errors(struct interface *iface)
  98 {
  99         /* don't flush the errors in case the configured protocol handler matches the
 100            running protocol handler and is having the last error capability */
 101         if (!(iface->proto &&
 102               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 103               (iface->proto->handler->name == iface->proto_handler->name)))
 104                 interface_error_flush(iface);
 105 }
 106
 107 void interface_add_error(struct interface *iface, const char *subsystem,
 108                          const char *code, const char **data, int n_data)
 109 {
 110         struct interface_error *error;
 111         int i, len = 0;
 112         int *datalen = NULL;
 113         char *dest, *d_subsys, *d_code;
 114
 115         /* if the configured protocol handler has the last error support capability,
 116            errors should only be added if the running protocol handler matches the
 117            configured one */
 118         if (iface->proto &&
 119             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 120             (iface->proto->handler->name != iface->proto_handler->name))
 121                 return;
 122
 123         if (n_data) {
 124                 len = n_data * sizeof(char *);
 125                 datalen = alloca(len);
 126                 for (i = 0; i < n_data; i++) {
 127                         datalen[i] = strlen(data[i]) + 1;
 128                         len += datalen[i];
 129                 }
 130         }
 131
 132         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 133                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 134                 &d_code, code ? strlen(code) + 1 : 0);
 135         if (!error)
 136                 return;
 137
 138         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 139            protocol can't be established (e.g auth failure) */
 140         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 141                 interface_error_flush(iface);
 142
 143         list_add_tail(&error->list, &iface->errors);
 144
 145         dest = (char *) &error->data[n_data + 1];
 146         for (i = 0; i < n_data; i++) {
 147                 error->data[i] = dest;
 148                 memcpy(dest, data[i], datalen[i]);
 149                 dest += datalen[i];
 150         }
 151         error->data[n_data] = NULL;
 152
 153         if (subsystem)
 154                 error->subsystem = strcpy(d_subsys, subsystem);
 155
 156         if (code)
 157                 error->code = strcpy(d_code, code);
 158 }
 159
 160 static void
 161 interface_data_del(struct interface *iface, struct interface_data *data)
 162 {
 163         avl_delete(&iface->data, &data->node);
 164         free(data);
 165 }
 166
 167 static void
 168 interface_data_flush(struct interface *iface)
 169 {
 170         struct interface_data *d, *tmp;
 171
 172         avl_for_each_element_safe(&iface->data, d, node, tmp)
 173                 interface_data_del(iface, d);
 174 }
 175
 176 int
 177 interface_add_data(struct interface *iface, const struct blob_attr *data)
 178 {
 179         struct interface_data *n, *o;
 180
 181         if (!blobmsg_check_attr(data, true))
 182                 return UBUS_STATUS_INVALID_ARGUMENT;
 183
 184         const char *name = blobmsg_name(data);
 185         unsigned len = blob_pad_len(data);
 186
 187         o = avl_find_element(&iface->data, name, o, node);
 188         if (o) {
 189                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 190                         return 0;
 191
 192                 interface_data_del(iface, o);
 193         }
 194
 195         n = calloc(1, sizeof(*n) + len);
 196         if (!n)
 197                 return UBUS_STATUS_UNKNOWN_ERROR;
 198
 199         memcpy(n->data, data, len);
 200         n->node.key = blobmsg_name(n->data);
 201         avl_insert(&iface->data, &n->node);
 202
 203         iface->updated |= IUF_DATA;
 204         return 0;
 205 }
 206
 207 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 208 {
 209         struct blob_attr *cur;
 210         int rem, ret;
 211
 212         iface->updated = 0;
 213
 214         blob_for_each_attr(cur, attr, rem) {
 215                 ret = interface_add_data(iface, cur);
 216                 if (ret)
 217                         return ret;
 218         }
 219
 220         if (iface->updated && iface->state == IFS_UP)
 221                 interface_event(iface, IFEV_UPDATE);
 222
 223         return 0;
 224 }
 225
 226 static void
 227 interface_event(struct interface *iface, enum interface_event ev)
 228 {
 229         struct interface_user *dep, *tmp;
 230         struct device *adev = NULL;
 231
 232         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 233                 dep->cb(dep, iface, ev);
 234
 235         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 236                 dep->cb(dep, iface, ev);
 237
 238         switch (ev) {
 239         case IFEV_UP:
 240                 interface_error_flush(iface);
 241                 adev = iface->l3_dev.dev;
 242                 /* fall through */
 243         case IFEV_DOWN:
 244         case IFEV_UP_FAILED:
 245                 alias_notify_device(iface->name, adev);
 246                 break;
 247         default:
 248                 break;
 249         }
 250 }
 251
 252 static void
 253 interface_flush_state(struct interface *iface)
 254 {
 255         if (iface->l3_dev.dev)
 256                 device_release(&iface->l3_dev);
 257         interface_data_flush(iface);
 258 }
 259
 260 static void
 261 mark_interface_down(struct interface *iface)
 262 {
 263         enum interface_state state = iface->state;
 264
 265         if (state == IFS_DOWN)
 266                 return;
 267
 268         iface->link_up_event = false;
 269         iface->state = IFS_DOWN;
 270         switch (state) {
 271         case IFS_UP:
 272                 interface_event(iface, IFEV_DOWN);
 273                 break;
 274         case IFS_SETUP:
 275                 interface_event(iface, IFEV_UP_FAILED);
 276                 break;
 277         default:
 278                 break;
 279         }
 280         interface_ip_set_enabled(&iface->config_ip, false);
 281         interface_ip_set_enabled(&iface->proto_ip, false);
 282         interface_ip_flush(&iface->proto_ip);
 283         interface_flush_state(iface);
 284         system_flush_routes();
 285 }
 286
 287 static void
 288 __interface_set_down(struct interface *iface, bool force)
 289 {
 290         enum interface_state state = iface->state;
 291         switch (state) {
 292         case IFS_UP:
 293         case IFS_SETUP:
 294                 iface->state = IFS_TEARDOWN;
 295                 if (state == IFS_UP)
 296                         interface_event(iface, IFEV_DOWN);
 297
 298                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 299                 if (force)
 300                         interface_flush_state(iface);
 301                 break;
 302
 303         case IFS_DOWN:
 304                 if (iface->main_dev.dev)
 305                         device_release(&iface->main_dev);
 306         case IFS_TEARDOWN:
 307         default:
 308                 break;
 309         }
 310 }
 311
 312 static int
 313 __interface_set_up(struct interface *iface)
 314 {
 315         int ret;
 316
 317         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 318
 319         iface->state = IFS_SETUP;
 320         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 321         if (ret)
 322                 mark_interface_down(iface);
 323
 324         return ret;
 325 }
 326
 327 static void
 328 interface_check_state(struct interface *iface)
 329 {
 330         bool link_state = iface->link_state || iface->force_link;
 331
 332         switch (iface->state) {
 333         case IFS_UP:
 334         case IFS_SETUP:
 335                 if (!iface->enabled || !link_state) {
 336                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 337                         mark_interface_down(iface);
 338                 }
 339                 break;
 340         case IFS_DOWN:
 341                 if (!iface->available)
 342                         return;
 343
 344                 if (iface->autostart && iface->enabled && link_state && !config_init)
 345                         __interface_set_up(iface);
 346                 break;
 347         default:
 348                 break;
 349         }
 350 }
 351
 352 static void
 353 interface_set_enabled(struct interface *iface, bool new_state)
 354 {
 355         if (iface->enabled == new_state)
 356                 return;
 357
 358         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 359         iface->enabled = new_state;
 360         interface_check_state(iface);
 361 }
 362
 363 static void
 364 interface_set_link_state(struct interface *iface, bool new_state)
 365 {
 366         if (iface->link_state == new_state)
 367                 return;
 368
 369         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 370         iface->link_state = new_state;
 371         interface_check_state(iface);
 372
 373         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 374                 interface_event(iface, IFEV_LINK_UP);
 375                 iface->link_up_event = true;
 376         }
 377 }
 378
 379 static void
 380 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 381 {
 382         if (ev == DEV_EVENT_REMOVE)
 383                 device_remove_user(dep);
 384 }
 385
 386 static void
 387 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 388 {
 389         struct interface *iface;
 390
 391         iface = container_of(dep, struct interface, main_dev);
 392         switch (ev) {
 393         case DEV_EVENT_ADD:
 394                 interface_set_available(iface, true);
 395                 break;
 396         case DEV_EVENT_REMOVE:
 397                 interface_set_available(iface, false);
 398                 if (dep->dev && dep->dev->external)
 399                         interface_set_main_dev(iface, NULL);
 400                 break;
 401         case DEV_EVENT_UP:
 402                 interface_set_enabled(iface, true);
 403                 break;
 404         case DEV_EVENT_DOWN:
 405                 interface_set_enabled(iface, false);
 406                 break;
 407         case DEV_EVENT_LINK_UP:
 408                 interface_set_link_state(iface, true);
 409                 break;
 410         case DEV_EVENT_LINK_DOWN:
 411                 interface_set_link_state(iface, false);
 412                 break;
 413         case DEV_EVENT_TOPO_CHANGE:
 414                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 415                 return;
 416         default:
 417                 break;
 418         }
 419 }
 420
 421 static void
 422 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 423 {
 424         struct interface *iface;
 425
 426         iface = container_of(dep, struct interface, l3_dev);
 427         if (iface->l3_dev.dev == iface->main_dev.dev)
 428                 return;
 429
 430         switch (ev) {
 431         case DEV_EVENT_LINK_DOWN:
 432                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 433                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 434                 break;
 435         default:
 436                 break;
 437         }
 438 }
 439
 440 void
 441 interface_set_available(struct interface *iface, bool new_state)
 442 {
 443         if (iface->available == new_state)
 444                 return;
 445
 446         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 447         iface->available = new_state;
 448
 449         if (new_state) {
 450                 if (iface->autostart && !config_init)
 451                         interface_set_up(iface);
 452         } else
 453                 __interface_set_down(iface, true);
 454 }
 455
 456 void
 457 interface_add_user(struct interface_user *dep, struct interface *iface)
 458 {
 459         if (!iface) {
 460                 list_add(&dep->list, &iface_all_users);
 461                 return;
 462         }
 463
 464         dep->iface = iface;
 465         list_add(&dep->list, &iface->users);
 466         if (iface->state == IFS_UP)
 467                 dep->cb(dep, iface, IFEV_UP);
 468 }
 469
 470 void
 471 interface_remove_user(struct interface_user *dep)
 472 {
 473         list_del_init(&dep->list);
 474         dep->iface = NULL;
 475 }
 476
 477 static void
 478 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 479 {
 480         struct blob_attr *cur;
 481         int rem;
 482
 483         blobmsg_for_each_attr(cur, list, rem) {
 484                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 485                         continue;
 486
 487                 if (!blobmsg_check_attr(cur, NULL))
 488                         continue;
 489
 490                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 491                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 492                 list_add(&c->head, &iface->assignment_classes);
 493         }
 494 }
 495
 496 static void
 497 interface_clear_assignment_classes(struct interface *iface)
 498 {
 499         while (!list_empty(&iface->assignment_classes)) {
 500                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 501                                 struct interface_assignment_class, head);
 502                 list_del(&c->head);
 503                 free(c);
 504         }
 505 }
 506
 507 static void
 508 interface_merge_assignment_data(struct interface *old, struct interface *new)
 509 {
 510         bool changed = (old->assignment_hint != new->assignment_hint ||
 511                         old->assignment_length != new->assignment_length ||
 512                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 513                         old->assignment_weight != new->assignment_weight ||
 514                         (old->assignment_iface_id_selection == IFID_FIXED &&
 515                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 516                                 sizeof(old->assignment_fixed_iface_id))) ||
 517                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 518
 519         struct interface_assignment_class *c;
 520         list_for_each_entry(c, &new->assignment_classes, head) {
 521                 // Compare list entries one-by-one to see if there was a change
 522                 if (list_empty(&old->assignment_classes)) // The new list is longer
 523                         changed = true;
 524
 525                 if (changed)
 526                         break;
 527
 528                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 529                                 struct interface_assignment_class, head);
 530
 531                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 532                         break;
 533
 534                 list_del(&c_old->head);
 535                 free(c_old);
 536         }
 537
 538         // The old list was longer than the new one or the last entry didn't match
 539         if (!list_empty(&old->assignment_classes)) {
 540                 interface_clear_assignment_classes(old);
 541                 changed = true;
 542         }
 543
 544         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 545
 546         if (changed) {
 547                 old->assignment_hint = new->assignment_hint;
 548                 old->assignment_length = new->assignment_length;
 549                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 550                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 551                 old->assignment_weight = new->assignment_weight;
 552                 interface_refresh_assignments(true);
 553         }
 554 }
 555
 556 static void
 557 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 558 {
 559         struct interface *alias = container_of(dep, struct interface, parent_iface);
 560         struct device *dev = iface->l3_dev.dev;
 561
 562         switch (ev) {
 563         case IFEV_UP:
 564                 if (!dev)
 565                         return;
 566
 567                 interface_set_main_dev(alias, dev);
 568                 interface_set_available(alias, true);
 569                 break;
 570         case IFEV_DOWN:
 571         case IFEV_UP_FAILED:
 572                 interface_set_available(alias, false);
 573                 interface_set_main_dev(alias, NULL);
 574                 break;
 575         case IFEV_FREE:
 576                 interface_remove_user(dep);
 577                 break;
 578         default:
 579                 break;
 580         }
 581 }
 582
 583 static void
 584 interface_set_device_config(struct interface *iface, struct device *dev)
 585 {
 586         if (!dev || !dev->default_config)
 587                 return;
 588
 589         if (!iface->device_config &&
 590             (!dev->iface_config || dev->config_iface != iface))
 591                 return;
 592
 593         dev->config_iface = iface;
 594         dev->iface_config = iface->device_config;
 595         device_apply_config(dev, dev->type, iface->config);
 596 }
 597
 598 static void
 599 interface_claim_device(struct interface *iface)
 600 {
 601         struct interface *parent;
 602         struct device *dev = NULL;
 603
 604         if (iface->parent_iface.iface)
 605                 interface_remove_user(&iface->parent_iface);
 606
 607         device_lock();
 608
 609         if (iface->parent_ifname) {
 610                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 611                 iface->parent_iface.cb = interface_alias_cb;
 612                 interface_add_user(&iface->parent_iface, parent);
 613         } else if (iface->ifname &&
 614                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 615                 dev = device_get(iface->ifname, true);
 616                 interface_set_device_config(iface, dev);
 617         } else {
 618                 dev = iface->ext_dev.dev;
 619         }
 620
 621         if (dev)
 622                 interface_set_main_dev(iface, dev);
 623
 624         device_unlock();
 625
 626         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 627                 interface_set_available(iface, true);
 628 }
 629
 630 static void
 631 interface_cleanup_state(struct interface *iface)
 632 {
 633         interface_set_available(iface, false);
 634
 635         interface_flush_state(iface);
 636         interface_clear_errors(iface);
 637         interface_set_proto_state(iface, NULL);
 638
 639         interface_set_main_dev(iface, NULL);
 640         interface_set_l3_dev(iface, NULL);
 641 }
 642
 643 static void
 644 interface_cleanup(struct interface *iface)
 645 {
 646         struct interface_user *dep, *tmp;
 647
 648         uloop_timeout_cancel(&iface->remove_timer);
 649         device_remove_user(&iface->ext_dev);
 650
 651         if (iface->parent_iface.iface)
 652                 interface_remove_user(&iface->parent_iface);
 653
 654         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 655                 interface_remove_user(dep);
 656
 657         interface_clear_assignment_classes(iface);
 658         interface_ip_flush(&iface->config_ip);
 659         interface_cleanup_state(iface);
 660 }
 661
 662 static void
 663 interface_do_free(struct interface *iface)
 664 {
 665         interface_event(iface, IFEV_FREE);
 666         interface_cleanup(iface);
 667         free(iface->config);
 668         netifd_ubus_remove_interface(iface);
 669         avl_delete(&interfaces.avl, &iface->node.avl);
 670         free(iface);
 671 }
 672
 673 static void
 674 interface_do_reload(struct interface *iface)
 675 {
 676         interface_event(iface, IFEV_RELOAD);
 677         interface_cleanup_state(iface);
 678         proto_init_interface(iface, iface->config);
 679         interface_claim_device(iface);
 680 }
 681
 682 static void
 683 interface_handle_config_change(struct interface *iface)
 684 {
 685         enum interface_config_state state = iface->config_state;
 686
 687         iface->config_state = IFC_NORMAL;
 688         switch(state) {
 689         case IFC_NORMAL:
 690                 break;
 691         case IFC_RELOAD:
 692                 interface_do_reload(iface);
 693                 break;
 694         case IFC_REMOVE:
 695                 interface_do_free(iface);
 696                 return;
 697         }
 698         if (iface->autostart)
 699                 interface_set_up(iface);
 700         else if (iface->dynamic)
 701                 set_config_state(iface, IFC_REMOVE);
 702 }
 703
 704 static void
 705 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 706 {
 707         struct interface *iface = state->iface;
 708
 709         switch (ev) {
 710         case IFPEV_UP:
 711                 if (iface->state != IFS_SETUP) {
 712                         if (iface->state == IFS_UP && iface->updated)
 713                                 interface_event(iface, IFEV_UPDATE);
 714                         return;
 715                 }
 716
 717                 if (!iface->l3_dev.dev)
 718                         interface_set_l3_dev(iface, iface->main_dev.dev);
 719
 720                 interface_ip_set_enabled(&iface->config_ip, true);
 721                 interface_ip_set_enabled(&iface->proto_ip, true);
 722                 system_flush_routes();
 723                 iface->state = IFS_UP;
 724                 iface->start_time = system_get_rtime();
 725                 interface_event(iface, IFEV_UP);
 726                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 727                 break;
 728         case IFPEV_DOWN:
 729                 if (iface->state == IFS_DOWN)
 730                         return;
 731
 732                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 733                 mark_interface_down(iface);
 734                 if (iface->main_dev.dev)
 735                         device_release(&iface->main_dev);
 736                 if (iface->l3_dev.dev)
 737                         device_remove_user(&iface->l3_dev);
 738                 interface_handle_config_change(iface);
 739                 break;
 740         case IFPEV_LINK_LOST:
 741                 if (iface->state != IFS_UP)
 742                         return;
 743
 744                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 745                 mark_interface_down(iface);
 746                 iface->state = IFS_SETUP;
 747                 break;
 748         default:
 749                 return;
 750         }
 751
 752         interface_write_resolv_conf();
 753 }
 754
 755 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 756 {
 757         if (iface->proto) {
 758                 iface->proto->free(iface->proto);
 759                 iface->proto = NULL;
 760         }
 761         iface->state = IFS_DOWN;
 762         iface->proto = state;
 763         if (!state)
 764                 return;
 765
 766         state->proto_event = interface_proto_event_cb;
 767         state->iface = iface;
 768 }
 769
 770 struct interface *
 771 interface_alloc(const char *name, struct blob_attr *config)
 772 {
 773         struct interface *iface;
 774         struct blob_attr *tb[IFACE_ATTR_MAX];
 775         struct blob_attr *cur;
 776         const char *proto_name = NULL;
 777         char *iface_name;
 778         bool force_link = false;
 779
 780         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 781         iface->name = strcpy(iface_name, name);
 782         INIT_LIST_HEAD(&iface->errors);
 783         INIT_LIST_HEAD(&iface->users);
 784         INIT_LIST_HEAD(&iface->hotplug_list);
 785         INIT_LIST_HEAD(&iface->assignment_classes);
 786         interface_ip_init(iface);
 787         avl_init(&iface->data, avl_strcmp, false, NULL);
 788         iface->config_ip.enabled = false;
 789
 790         iface->main_dev.cb = interface_main_dev_cb;
 791         iface->l3_dev.cb = interface_l3_dev_cb;
 792         iface->ext_dev.cb = interface_ext_dev_cb;
 793
 794         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 795                       blob_data(config), blob_len(config));
 796
 797         if ((cur = tb[IFACE_ATTR_PROTO]))
 798                 proto_name = blobmsg_data(cur);
 799
 800         proto_attach_interface(iface, proto_name);
 801         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 802                 force_link = true;
 803
 804         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 805         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 806         iface->proto_ip.no_defaultroute =
 807                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 808         iface->proto_ip.no_dns =
 809                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 810
 811         if ((cur = tb[IFACE_ATTR_DNS]))
 812                 interface_add_dns_server_list(&iface->config_ip, cur);
 813
 814         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 815                 interface_add_dns_search_list(&iface->config_ip, cur);
 816
 817         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 818                 iface->dns_metric = blobmsg_get_u32(cur);
 819
 820         if ((cur = tb[IFACE_ATTR_METRIC]))
 821                 iface->metric = blobmsg_get_u32(cur);
 822
 823         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 824                 iface->assignment_length = blobmsg_get_u32(cur);
 825
 826         /* defaults */
 827         iface->assignment_iface_id_selection = IFID_FIXED;
 828         iface->assignment_fixed_iface_id = in6addr_any;
 829         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 830
 831         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 832                 const char *ifaceid = blobmsg_data(cur);
 833                 if (!strcmp(ifaceid, "random")) {
 834                         iface->assignment_iface_id_selection = IFID_RANDOM;
 835                 }
 836                 else if (!strcmp(ifaceid, "eui64")) {
 837                         iface->assignment_iface_id_selection = IFID_EUI64;
 838                 }
 839                 else {
 840                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 841                            if we cannot parse -> revert to iface id 1 */
 842                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 843                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 844                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 845                                 iface->assignment_fixed_iface_id = in6addr_any;
 846                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 847                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 848                                                         falling back to iface id 1.\n", iface->name);
 849                         }
 850                 }
 851         }
 852
 853         iface->assignment_hint = -1;
 854         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 855                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 856                                 ~((1 << (64 - iface->assignment_length)) - 1);
 857
 858         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 859                 interface_add_assignment_classes(iface, cur);
 860
 861         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 862                 iface->assignment_weight = blobmsg_get_u32(cur);
 863
 864         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 865                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 866                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 867         }
 868
 869         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 870                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 871                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 872         }
 873
 874         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 875
 876         iface->config_autostart = iface->autostart;
 877         return iface;
 878 }
 879
 880 void interface_set_dynamic(struct interface *iface)
 881 {
 882         iface->dynamic = true;
 883         iface->autostart = true;
 884         iface->node.version = -1; // Don't delete on reload
 885 }
 886
 887 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 888 {
 889         struct blob_attr *tb[IFACE_ATTR_MAX];
 890         struct blob_attr *cur;
 891
 892         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 893                       blob_data(config), blob_len(config));
 894
 895         if (alias) {
 896                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 897                         iface->parent_ifname = blobmsg_data(cur);
 898
 899                 if (!iface->parent_ifname)
 900                         return false;
 901         } else {
 902                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 903                         iface->ifname = blobmsg_data(cur);
 904         }
 905
 906         iface->config = config;
 907         vlist_add(&interfaces, &iface->node, iface->name);
 908         return true;
 909 }
 910
 911 void
 912 interface_add(struct interface *iface, struct blob_attr *config)
 913 {
 914         __interface_add(iface, config, false);
 915 }
 916
 917 bool
 918 interface_add_alias(struct interface *iface, struct blob_attr *config)
 919 {
 920         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 921                 return false;
 922
 923         return __interface_add(iface, config, true);
 924 }
 925
 926 void
 927 interface_set_l3_dev(struct interface *iface, struct device *dev)
 928 {
 929         bool enabled = iface->config_ip.enabled;
 930         bool claimed = iface->l3_dev.claimed;
 931
 932         if (iface->l3_dev.dev == dev)
 933                 return;
 934
 935         interface_ip_set_enabled(&iface->config_ip, false);
 936         interface_ip_set_enabled(&iface->proto_ip, false);
 937         interface_ip_flush(&iface->proto_ip);
 938         device_add_user(&iface->l3_dev, dev);
 939
 940         if (dev) {
 941                 if (claimed) {
 942                         if (device_claim(&iface->l3_dev) < 0)
 943                                 return;
 944                 }
 945                 interface_ip_set_enabled(&iface->config_ip, enabled);
 946                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 947         }
 948 }
 949
 950 void
 951 interface_set_main_dev(struct interface *iface, struct device *dev)
 952 {
 953         bool claimed = iface->l3_dev.claimed;
 954
 955         if (iface->main_dev.dev == dev)
 956                 return;
 957
 958         interface_set_available(iface, false);
 959         device_add_user(&iface->main_dev, dev);
 960         if (!dev) {
 961                 interface_set_link_state(iface, false);
 962                 return;
 963         }
 964
 965         if (claimed) {
 966                 if (device_claim(&iface->l3_dev) < 0)
 967                         return;
 968         }
 969
 970         if (!iface->l3_dev.dev)
 971                 interface_set_l3_dev(iface, dev);
 972 }
 973
 974 int
 975 interface_remove_link(struct interface *iface, struct device *dev)
 976 {
 977         struct device *mdev = iface->main_dev.dev;
 978
 979         if (mdev && mdev->hotplug_ops)
 980                 return mdev->hotplug_ops->del(mdev, dev);
 981
 982         if (dev == iface->ext_dev.dev)
 983                 device_remove_user(&iface->ext_dev);
 984
 985         if (!iface->main_dev.hotplug)
 986                 return UBUS_STATUS_INVALID_ARGUMENT;
 987
 988         if (dev != iface->main_dev.dev)
 989                 return UBUS_STATUS_INVALID_ARGUMENT;
 990
 991         interface_set_main_dev(iface, NULL);
 992         return 0;
 993 }
 994
 995 static int
 996 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 997 {
 998         struct device *mdev = iface->main_dev.dev;
 999
1000         if (mdev == dev)
1001                 return 0;
1002
1003         if (iface->main_dev.hotplug)
1004                 device_remove_user(&iface->main_dev);
1005
1006         if (mdev) {
1007                 if (mdev->hotplug_ops)
1008                         return mdev->hotplug_ops->add(mdev, dev);
1009                 else
1010                         return UBUS_STATUS_NOT_SUPPORTED;
1011         }
1012
1013         if (link_ext)
1014                 device_add_user(&iface->ext_dev, dev);
1015
1016         interface_set_main_dev(iface, dev);
1017         iface->main_dev.hotplug = true;
1018         return 0;
1019 }
1020
1021 int
1022 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
1023 {
1024         struct device *dev;
1025         int ret;
1026
1027         device_lock();
1028
1029         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1030         if (!dev) {
1031                 ret = UBUS_STATUS_NOT_FOUND;
1032                 goto out;
1033         }
1034
1035         if (add) {
1036                 interface_set_device_config(iface, dev);
1037                 device_set_present(dev, true);
1038
1039                 ret = interface_add_link(iface, dev, link_ext);
1040         } else {
1041                 ret = interface_remove_link(iface, dev);
1042         }
1043
1044 out:
1045         device_unlock();
1046
1047         return ret;
1048 }
1049
1050 void
1051 interface_set_up(struct interface *iface)
1052 {
1053         int ret;
1054         const char *error = NULL;
1055
1056         iface->autostart = true;
1057
1058         if (iface->state != IFS_DOWN)
1059                 return;
1060
1061         interface_clear_errors(iface);
1062         if (iface->available) {
1063                 if (iface->main_dev.dev) {
1064                         ret = device_claim(&iface->main_dev);
1065                         if (!ret)
1066                                 interface_check_state(iface);
1067                         else
1068                                 error = "DEVICE_CLAIM_FAILED";
1069                 } else {
1070                         ret = __interface_set_up(iface);
1071                         if (ret)
1072                                 error = "SETUP_FAILED";
1073                 }
1074         } else
1075                 error = "NO_DEVICE";
1076
1077         if (error)
1078                 interface_add_error(iface, "interface", error, NULL, 0);
1079 }
1080
1081 void
1082 interface_set_down(struct interface *iface)
1083 {
1084         if (!iface) {
1085                 vlist_for_each_element(&interfaces, iface, node)
1086                         __interface_set_down(iface, false);
1087         } else {
1088                 iface->autostart = false;
1089                 __interface_set_down(iface, false);
1090         }
1091 }
1092
1093 int
1094 interface_renew(struct interface *iface)
1095 {
1096         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1097                 return -1;
1098
1099         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1100 }
1101
1102 void
1103 interface_start_pending(void)
1104 {
1105         struct interface *iface;
1106
1107         vlist_for_each_element(&interfaces, iface, node) {
1108                 if (iface->autostart)
1109                         interface_set_up(iface);
1110         }
1111 }
1112
1113 static void
1114 set_config_state(struct interface *iface, enum interface_config_state s)
1115 {
1116         iface->config_state = s;
1117         if (iface->state == IFS_DOWN)
1118                 interface_handle_config_change(iface);
1119         else
1120                 __interface_set_down(iface, false);
1121 }
1122
1123 void
1124 interface_update_start(struct interface *iface, const bool keep_old)
1125 {
1126         iface->updated = 0;
1127
1128         if (!keep_old)
1129                 interface_ip_update_start(&iface->proto_ip);
1130 }
1131
1132 void
1133 interface_update_complete(struct interface *iface)
1134 {
1135         interface_ip_update_complete(&iface->proto_ip);
1136 }
1137
1138 static void
1139 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1140 {
1141         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1142         vlist_simple_replace(&new->dns_search, &old->dns_search);
1143 }
1144
1145 static bool
1146 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1147 {
1148         struct blob_attr *ntb[__DEV_ATTR_MAX];
1149         struct blob_attr *otb[__DEV_ATTR_MAX];
1150         struct device *dev = if_old->main_dev.dev;
1151         unsigned long diff = 0;
1152
1153         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1154
1155         if (!dev)
1156                 return false;
1157
1158         if (if_old->device_config != if_new->device_config)
1159                 return true;
1160
1161         if (!if_new->device_config)
1162                 return false;
1163
1164         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1165                 blob_data(if_old->config), blob_len(if_old->config));
1166
1167         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1168                 blob_data(if_new->config), blob_len(if_new->config));
1169
1170         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1171         return diff;
1172 }
1173
1174 static void
1175 interface_change_config(struct interface *if_old, struct interface *if_new)
1176 {
1177         struct blob_attr *old_config = if_old->config;
1178         bool reload = false, reload_ip = false;
1179
1180 #define FIELD_CHANGED_STR(field)                                        \
1181                 ((!!if_old->field != !!if_new->field) ||                \
1182                  (if_old->field &&                                      \
1183                   strcmp(if_old->field, if_new->field) != 0))
1184
1185         if (FIELD_CHANGED_STR(parent_ifname)) {
1186                 if (if_old->parent_iface.iface)
1187                         interface_remove_user(&if_old->parent_iface);
1188                 reload = true;
1189         }
1190
1191         if (!reload && interface_device_config_changed(if_old, if_new))
1192                 reload = true;
1193
1194         if (FIELD_CHANGED_STR(ifname) ||
1195             if_old->proto_handler != if_new->proto_handler)
1196                 reload = true;
1197
1198         if (!if_old->proto_handler->config_params)
1199                 D(INTERFACE, "No config parameters for interface '%s'\n",
1200                   if_old->name);
1201         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1202                                        if_old->proto_handler->config_params))
1203                 reload = true;
1204
1205 #define UPDATE(field, __var) ({                                         \
1206                 bool __changed = (if_old->field != if_new->field);      \
1207                 if_old->field = if_new->field;                          \
1208                 __var |= __changed;                                     \
1209         })
1210
1211         if_old->config = if_new->config;
1212         if (if_old->config_autostart != if_new->config_autostart) {
1213                 if (if_old->config_autostart)
1214                         reload = true;
1215
1216                 if_old->autostart = if_new->config_autostart;
1217         }
1218
1219         if_old->device_config = if_new->device_config;
1220         if_old->config_autostart = if_new->config_autostart;
1221         if_old->ifname = if_new->ifname;
1222         if_old->parent_ifname = if_new->parent_ifname;
1223         if_old->proto_handler = if_new->proto_handler;
1224         if_old->force_link = if_new->force_link;
1225         if_old->dns_metric = if_new->dns_metric;
1226
1227         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1228         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1229
1230         UPDATE(metric, reload_ip);
1231         UPDATE(proto_ip.no_defaultroute, reload_ip);
1232         UPDATE(ip4table, reload_ip);
1233         UPDATE(ip6table, reload_ip);
1234         interface_merge_assignment_data(if_old, if_new);
1235
1236 #undef UPDATE
1237
1238         if (reload) {
1239                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1240                   if_old->name);
1241                 interface_clear_errors(if_old);
1242                 set_config_state(if_old, IFC_RELOAD);
1243                 goto out;
1244         }
1245
1246         if (reload_ip) {
1247                 bool config_ip_enabled = if_old->config_ip.enabled;
1248                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1249
1250                 interface_ip_set_enabled(&if_old->config_ip, false);
1251                 interface_ip_set_enabled(&if_old->proto_ip, false);
1252                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1253                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1254         }
1255
1256         interface_write_resolv_conf();
1257         if (if_old->main_dev.dev)
1258                 interface_check_state(if_old);
1259
1260 out:
1261         if_new->config = NULL;
1262         interface_cleanup(if_new);
1263         free(old_config);
1264         free(if_new);
1265 }
1266
1267 static void
1268 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1269                  struct vlist_node *node_old)
1270 {
1271         struct interface *if_old = container_of(node_old, struct interface, node);
1272         struct interface *if_new = container_of(node_new, struct interface, node);
1273
1274         if (node_old && node_new) {
1275                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1276                 interface_change_config(if_old, if_new);
1277         } else if (node_old) {
1278                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1279                 set_config_state(if_old, IFC_REMOVE);
1280         } else if (node_new) {
1281                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1282                 interface_event(if_new, IFEV_CREATE);
1283                 proto_init_interface(if_new, if_new->config);
1284                 interface_claim_device(if_new);
1285                 netifd_ubus_add_interface(if_new);
1286         }
1287 }
1288
1289
1290 static void __init
1291 interface_init_list(void)
1292 {
1293         vlist_init(&interfaces, avl_strcmp, interface_update);
1294         interfaces.keep_old = true;
1295         interfaces.no_delete = true;
1296 }