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 interface_set_main_dev(struct interface *iface, struct device *dev);
  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 inline void
 288 __set_config_state(struct interface *iface, enum interface_config_state s)
 289 {
 290         iface->config_state = s;
 291 }
 292
 293 static void
 294 __interface_set_down(struct interface *iface, bool force)
 295 {
 296         enum interface_state state = iface->state;
 297         switch (state) {
 298         case IFS_UP:
 299         case IFS_SETUP:
 300                 iface->state = IFS_TEARDOWN;
 301                 if (iface->dynamic)
 302                         __set_config_state(iface, IFC_REMOVE);
 303
 304                 if (state == IFS_UP)
 305                         interface_event(iface, IFEV_DOWN);
 306
 307                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 308                 if (force)
 309                         interface_flush_state(iface);
 310                 break;
 311
 312         case IFS_DOWN:
 313                 if (iface->main_dev.dev)
 314                         device_release(&iface->main_dev);
 315         case IFS_TEARDOWN:
 316         default:
 317                 break;
 318         }
 319 }
 320
 321 static int
 322 __interface_set_up(struct interface *iface)
 323 {
 324         int ret;
 325
 326         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 327
 328         iface->state = IFS_SETUP;
 329         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 330         if (ret)
 331                 mark_interface_down(iface);
 332
 333         return ret;
 334 }
 335
 336 static void
 337 interface_check_state(struct interface *iface)
 338 {
 339         bool link_state = iface->link_state || iface->force_link;
 340
 341         switch (iface->state) {
 342         case IFS_UP:
 343         case IFS_SETUP:
 344                 if (!iface->enabled || !link_state) {
 345                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 346                         if (iface->dynamic)
 347                                 __set_config_state(iface, IFC_REMOVE);
 348
 349                         mark_interface_down(iface);
 350                 }
 351                 break;
 352         case IFS_DOWN:
 353                 if (!iface->available)
 354                         return;
 355
 356                 if (iface->autostart && iface->enabled && link_state && !config_init)
 357                         __interface_set_up(iface);
 358                 break;
 359         default:
 360                 break;
 361         }
 362 }
 363
 364 static void
 365 interface_set_enabled(struct interface *iface, bool new_state)
 366 {
 367         if (iface->enabled == new_state)
 368                 return;
 369
 370         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 371         iface->enabled = new_state;
 372         interface_check_state(iface);
 373 }
 374
 375 static void
 376 interface_set_link_state(struct interface *iface, bool new_state)
 377 {
 378         if (iface->link_state == new_state)
 379                 return;
 380
 381         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 382         iface->link_state = new_state;
 383         interface_check_state(iface);
 384
 385         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 386                 interface_event(iface, IFEV_LINK_UP);
 387                 iface->link_up_event = true;
 388         }
 389 }
 390
 391 static void
 392 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 393 {
 394         if (ev == DEV_EVENT_REMOVE)
 395                 device_remove_user(dep);
 396 }
 397
 398 static void
 399 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 400 {
 401         struct interface *iface;
 402
 403         iface = container_of(dep, struct interface, main_dev);
 404         switch (ev) {
 405         case DEV_EVENT_ADD:
 406                 interface_set_available(iface, true);
 407                 break;
 408         case DEV_EVENT_REMOVE:
 409                 interface_set_available(iface, false);
 410                 if (dep->dev && dep->dev->external)
 411                         interface_set_main_dev(iface, NULL);
 412                 break;
 413         case DEV_EVENT_UP:
 414                 interface_set_enabled(iface, true);
 415                 break;
 416         case DEV_EVENT_DOWN:
 417                 interface_set_enabled(iface, false);
 418                 break;
 419         case DEV_EVENT_LINK_UP:
 420                 interface_set_link_state(iface, true);
 421                 break;
 422         case DEV_EVENT_LINK_DOWN:
 423                 interface_set_link_state(iface, false);
 424                 break;
 425         case DEV_EVENT_TOPO_CHANGE:
 426                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 427                 return;
 428         default:
 429                 break;
 430         }
 431 }
 432
 433 static void
 434 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 435 {
 436         struct interface *iface;
 437
 438         iface = container_of(dep, struct interface, l3_dev);
 439         if (iface->l3_dev.dev == iface->main_dev.dev)
 440                 return;
 441
 442         switch (ev) {
 443         case DEV_EVENT_LINK_DOWN:
 444                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 445                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 446                 break;
 447         default:
 448                 break;
 449         }
 450 }
 451
 452 void
 453 interface_set_available(struct interface *iface, bool new_state)
 454 {
 455         if (iface->available == new_state)
 456                 return;
 457
 458         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 459         iface->available = new_state;
 460
 461         if (new_state) {
 462                 if (iface->autostart && !config_init)
 463                         interface_set_up(iface);
 464         } else
 465                 __interface_set_down(iface, true);
 466 }
 467
 468 void
 469 interface_add_user(struct interface_user *dep, struct interface *iface)
 470 {
 471         if (!iface) {
 472                 list_add(&dep->list, &iface_all_users);
 473                 return;
 474         }
 475
 476         dep->iface = iface;
 477         list_add(&dep->list, &iface->users);
 478         if (iface->state == IFS_UP)
 479                 dep->cb(dep, iface, IFEV_UP);
 480 }
 481
 482 void
 483 interface_remove_user(struct interface_user *dep)
 484 {
 485         list_del_init(&dep->list);
 486         dep->iface = NULL;
 487 }
 488
 489 static void
 490 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 491 {
 492         struct blob_attr *cur;
 493         int rem;
 494
 495         blobmsg_for_each_attr(cur, list, rem) {
 496                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 497                         continue;
 498
 499                 if (!blobmsg_check_attr(cur, NULL))
 500                         continue;
 501
 502                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 503                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 504                 list_add(&c->head, &iface->assignment_classes);
 505         }
 506 }
 507
 508 static void
 509 interface_clear_assignment_classes(struct interface *iface)
 510 {
 511         while (!list_empty(&iface->assignment_classes)) {
 512                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 513                                 struct interface_assignment_class, head);
 514                 list_del(&c->head);
 515                 free(c);
 516         }
 517 }
 518
 519 static void
 520 interface_merge_assignment_data(struct interface *old, struct interface *new)
 521 {
 522         bool changed = (old->assignment_hint != new->assignment_hint ||
 523                         old->assignment_length != new->assignment_length ||
 524                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 525                         old->assignment_weight != new->assignment_weight ||
 526                         (old->assignment_iface_id_selection == IFID_FIXED &&
 527                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 528                                 sizeof(old->assignment_fixed_iface_id))) ||
 529                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 530
 531         struct interface_assignment_class *c;
 532         list_for_each_entry(c, &new->assignment_classes, head) {
 533                 /* Compare list entries one-by-one to see if there was a change */
 534                 if (list_empty(&old->assignment_classes)) /* The new list is longer */
 535                         changed = true;
 536
 537                 if (changed)
 538                         break;
 539
 540                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 541                                 struct interface_assignment_class, head);
 542
 543                 if (strcmp(c_old->name, c->name)) /* An entry didn't match */
 544                         break;
 545
 546                 list_del(&c_old->head);
 547                 free(c_old);
 548         }
 549
 550         /* The old list was longer than the new one or the last entry didn't match */
 551         if (!list_empty(&old->assignment_classes)) {
 552                 interface_clear_assignment_classes(old);
 553                 changed = true;
 554         }
 555
 556         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 557
 558         if (changed) {
 559                 old->assignment_hint = new->assignment_hint;
 560                 old->assignment_length = new->assignment_length;
 561                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 562                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 563                 old->assignment_weight = new->assignment_weight;
 564                 interface_refresh_assignments(true);
 565         }
 566 }
 567
 568 static void
 569 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 570 {
 571         struct interface *alias = container_of(dep, struct interface, parent_iface);
 572         struct device *dev = iface->l3_dev.dev;
 573
 574         switch (ev) {
 575         case IFEV_UP:
 576                 if (!dev)
 577                         return;
 578
 579                 interface_set_main_dev(alias, dev);
 580                 interface_set_available(alias, true);
 581                 break;
 582         case IFEV_DOWN:
 583         case IFEV_UP_FAILED:
 584                 interface_set_available(alias, false);
 585                 interface_set_main_dev(alias, NULL);
 586                 break;
 587         case IFEV_FREE:
 588                 interface_remove_user(dep);
 589                 break;
 590         default:
 591                 break;
 592         }
 593 }
 594
 595 static void
 596 interface_set_device_config(struct interface *iface, struct device *dev)
 597 {
 598         if (!dev || !dev->default_config)
 599                 return;
 600
 601         if (!iface->device_config &&
 602             (!dev->iface_config || dev->config_iface != iface))
 603                 return;
 604
 605         dev->config_iface = iface;
 606         dev->iface_config = iface->device_config;
 607         device_apply_config(dev, dev->type, iface->config);
 608 }
 609
 610 static void
 611 interface_claim_device(struct interface *iface)
 612 {
 613         struct interface *parent;
 614         struct device *dev = NULL;
 615
 616         if (iface->parent_iface.iface)
 617                 interface_remove_user(&iface->parent_iface);
 618
 619         device_lock();
 620
 621         if (iface->parent_ifname) {
 622                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 623                 iface->parent_iface.cb = interface_alias_cb;
 624                 interface_add_user(&iface->parent_iface, parent);
 625         } else if (iface->ifname &&
 626                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 627                 dev = device_get(iface->ifname, true);
 628                 interface_set_device_config(iface, dev);
 629         } else {
 630                 dev = iface->ext_dev.dev;
 631         }
 632
 633         if (dev)
 634                 interface_set_main_dev(iface, dev);
 635
 636         device_unlock();
 637
 638         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 639                 interface_set_available(iface, true);
 640 }
 641
 642 static void
 643 interface_cleanup_state(struct interface *iface)
 644 {
 645         interface_set_available(iface, false);
 646
 647         interface_flush_state(iface);
 648         interface_clear_errors(iface);
 649         interface_set_proto_state(iface, NULL);
 650
 651         interface_set_main_dev(iface, NULL);
 652         interface_set_l3_dev(iface, NULL);
 653 }
 654
 655 static void
 656 interface_cleanup(struct interface *iface)
 657 {
 658         struct interface_user *dep, *tmp;
 659
 660         uloop_timeout_cancel(&iface->remove_timer);
 661         device_remove_user(&iface->ext_dev);
 662
 663         if (iface->parent_iface.iface)
 664                 interface_remove_user(&iface->parent_iface);
 665
 666         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 667                 interface_remove_user(dep);
 668
 669         interface_clear_assignment_classes(iface);
 670         interface_ip_flush(&iface->config_ip);
 671         interface_cleanup_state(iface);
 672 }
 673
 674 static void
 675 interface_do_free(struct interface *iface)
 676 {
 677         interface_event(iface, IFEV_FREE);
 678         interface_cleanup(iface);
 679         free(iface->config);
 680         netifd_ubus_remove_interface(iface);
 681         avl_delete(&interfaces.avl, &iface->node.avl);
 682         free(iface);
 683 }
 684
 685 static void
 686 interface_do_reload(struct interface *iface)
 687 {
 688         interface_event(iface, IFEV_RELOAD);
 689         interface_cleanup_state(iface);
 690         proto_init_interface(iface, iface->config);
 691         interface_claim_device(iface);
 692 }
 693
 694 static void
 695 interface_handle_config_change(struct interface *iface)
 696 {
 697         enum interface_config_state state = iface->config_state;
 698
 699         iface->config_state = IFC_NORMAL;
 700         switch(state) {
 701         case IFC_NORMAL:
 702                 break;
 703         case IFC_RELOAD:
 704                 interface_do_reload(iface);
 705                 break;
 706         case IFC_REMOVE:
 707                 interface_do_free(iface);
 708                 return;
 709         }
 710         if (iface->autostart)
 711                 interface_set_up(iface);
 712 }
 713
 714 static void
 715 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 716 {
 717         struct interface *iface = state->iface;
 718
 719         switch (ev) {
 720         case IFPEV_UP:
 721                 if (iface->state != IFS_SETUP) {
 722                         if (iface->state == IFS_UP && iface->updated)
 723                                 interface_event(iface, IFEV_UPDATE);
 724                         return;
 725                 }
 726
 727                 if (!iface->l3_dev.dev)
 728                         interface_set_l3_dev(iface, iface->main_dev.dev);
 729
 730                 interface_ip_set_enabled(&iface->config_ip, true);
 731                 interface_ip_set_enabled(&iface->proto_ip, true);
 732                 system_flush_routes();
 733                 iface->state = IFS_UP;
 734                 iface->start_time = system_get_rtime();
 735                 interface_event(iface, IFEV_UP);
 736                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 737                 break;
 738         case IFPEV_DOWN:
 739                 if (iface->state == IFS_DOWN)
 740                         return;
 741
 742                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 743                 mark_interface_down(iface);
 744                 if (iface->main_dev.dev)
 745                         device_release(&iface->main_dev);
 746                 if (iface->l3_dev.dev)
 747                         device_remove_user(&iface->l3_dev);
 748                 interface_handle_config_change(iface);
 749                 break;
 750         case IFPEV_LINK_LOST:
 751                 if (iface->state != IFS_UP)
 752                         return;
 753
 754                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 755                 mark_interface_down(iface);
 756                 iface->state = IFS_SETUP;
 757                 break;
 758         default:
 759                 return;
 760         }
 761
 762         interface_write_resolv_conf();
 763 }
 764
 765 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 766 {
 767         if (iface->proto) {
 768                 iface->proto->free(iface->proto);
 769                 iface->proto = NULL;
 770         }
 771         iface->state = IFS_DOWN;
 772         iface->proto = state;
 773         if (!state)
 774                 return;
 775
 776         state->proto_event = interface_proto_event_cb;
 777         state->iface = iface;
 778 }
 779
 780 struct interface *
 781 interface_alloc(const char *name, struct blob_attr *config, bool dynamic)
 782 {
 783         struct interface *iface;
 784         struct blob_attr *tb[IFACE_ATTR_MAX];
 785         struct blob_attr *cur;
 786         const char *proto_name = NULL;
 787         char *iface_name;
 788         bool force_link = false;
 789
 790         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 791         iface->name = strcpy(iface_name, name);
 792         INIT_LIST_HEAD(&iface->errors);
 793         INIT_LIST_HEAD(&iface->users);
 794         INIT_LIST_HEAD(&iface->hotplug_list);
 795         INIT_LIST_HEAD(&iface->assignment_classes);
 796         interface_ip_init(iface);
 797         avl_init(&iface->data, avl_strcmp, false, NULL);
 798         iface->config_ip.enabled = false;
 799
 800         iface->main_dev.cb = interface_main_dev_cb;
 801         iface->l3_dev.cb = interface_l3_dev_cb;
 802         iface->ext_dev.cb = interface_ext_dev_cb;
 803
 804         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 805                       blob_data(config), blob_len(config));
 806
 807         if ((cur = tb[IFACE_ATTR_PROTO]))
 808                 proto_name = blobmsg_data(cur);
 809
 810         proto_attach_interface(iface, proto_name);
 811         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 812                 force_link = true;
 813
 814         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 815         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 816         iface->dynamic = dynamic;
 817         iface->proto_ip.no_defaultroute =
 818                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 819         iface->proto_ip.no_dns =
 820                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 821
 822         if ((cur = tb[IFACE_ATTR_DNS]))
 823                 interface_add_dns_server_list(&iface->config_ip, cur);
 824
 825         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 826                 interface_add_dns_search_list(&iface->config_ip, cur);
 827
 828         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 829                 iface->dns_metric = blobmsg_get_u32(cur);
 830
 831         if ((cur = tb[IFACE_ATTR_METRIC]))
 832                 iface->metric = blobmsg_get_u32(cur);
 833
 834         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 835                 iface->assignment_length = blobmsg_get_u32(cur);
 836
 837         /* defaults */
 838         iface->assignment_iface_id_selection = IFID_FIXED;
 839         iface->assignment_fixed_iface_id = in6addr_any;
 840         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 841
 842         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 843                 const char *ifaceid = blobmsg_data(cur);
 844                 if (!strcmp(ifaceid, "random")) {
 845                         iface->assignment_iface_id_selection = IFID_RANDOM;
 846                 }
 847                 else if (!strcmp(ifaceid, "eui64")) {
 848                         iface->assignment_iface_id_selection = IFID_EUI64;
 849                 }
 850                 else {
 851                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 852                            if we cannot parse -> revert to iface id 1 */
 853                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 854                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 855                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 856                                 iface->assignment_fixed_iface_id = in6addr_any;
 857                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 858                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 859                                                         falling back to iface id 1.\n", iface->name);
 860                         }
 861                 }
 862         }
 863
 864         iface->assignment_hint = -1;
 865         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 866                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 867                                 ~((1 << (64 - iface->assignment_length)) - 1);
 868
 869         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 870                 interface_add_assignment_classes(iface, cur);
 871
 872         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 873                 iface->assignment_weight = blobmsg_get_u32(cur);
 874
 875         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 876                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 877                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 878         }
 879
 880         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 881                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 882                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 883         }
 884
 885         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 886
 887         iface->config_autostart = iface->autostart;
 888         return iface;
 889 }
 890
 891 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 892 {
 893         struct blob_attr *tb[IFACE_ATTR_MAX];
 894         struct blob_attr *cur;
 895         char *name = iface->dynamic ? strdup(iface->name) : NULL;
 896
 897         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 898                       blob_data(config), blob_len(config));
 899
 900         if (alias) {
 901                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 902                         iface->parent_ifname = blobmsg_data(cur);
 903
 904                 if (!iface->parent_ifname)
 905                         return false;
 906         } else {
 907                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 908                         iface->ifname = blobmsg_data(cur);
 909         }
 910
 911         iface->config = config;
 912         vlist_add(&interfaces, &iface->node, iface->name);
 913
 914         if (name) {
 915                 iface = vlist_find(&interfaces, name, iface, node);
 916                 free(name);
 917
 918                 if (!iface)
 919                         return false;
 920
 921                 /* Don't delete dynamic interface on reload */
 922                 iface->node.version = -1;
 923         }
 924
 925         return true;
 926 }
 927
 928 bool
 929 interface_add(struct interface *iface, struct blob_attr *config)
 930 {
 931         return __interface_add(iface, config, false);
 932 }
 933
 934 bool
 935 interface_add_alias(struct interface *iface, struct blob_attr *config)
 936 {
 937         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 938                 return false;
 939
 940         return __interface_add(iface, config, true);
 941 }
 942
 943 void
 944 interface_set_l3_dev(struct interface *iface, struct device *dev)
 945 {
 946         bool enabled = iface->config_ip.enabled;
 947         bool claimed = iface->l3_dev.claimed;
 948
 949         if (iface->l3_dev.dev == dev)
 950                 return;
 951
 952         interface_ip_set_enabled(&iface->config_ip, false);
 953         interface_ip_set_enabled(&iface->proto_ip, false);
 954         interface_ip_flush(&iface->proto_ip);
 955         device_add_user(&iface->l3_dev, dev);
 956
 957         if (dev) {
 958                 if (claimed) {
 959                         if (device_claim(&iface->l3_dev) < 0)
 960                                 return;
 961                 }
 962                 interface_ip_set_enabled(&iface->config_ip, enabled);
 963                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 964         }
 965 }
 966
 967 static void
 968 interface_set_main_dev(struct interface *iface, struct device *dev)
 969 {
 970         bool claimed = iface->l3_dev.claimed;
 971
 972         if (iface->main_dev.dev == dev)
 973                 return;
 974
 975         interface_set_available(iface, false);
 976         device_add_user(&iface->main_dev, dev);
 977         if (!dev) {
 978                 interface_set_link_state(iface, false);
 979                 return;
 980         }
 981
 982         if (claimed) {
 983                 if (device_claim(&iface->l3_dev) < 0)
 984                         return;
 985         }
 986
 987         if (!iface->l3_dev.dev)
 988                 interface_set_l3_dev(iface, dev);
 989 }
 990
 991 static int
 992 interface_remove_link(struct interface *iface, struct device *dev)
 993 {
 994         struct device *mdev = iface->main_dev.dev;
 995
 996         if (mdev && mdev->hotplug_ops)
 997                 return mdev->hotplug_ops->del(mdev, dev);
 998
 999         if (dev == iface->ext_dev.dev)
1000                 device_remove_user(&iface->ext_dev);
1001
1002         if (!iface->main_dev.hotplug)
1003                 return UBUS_STATUS_INVALID_ARGUMENT;
1004
1005         if (dev != iface->main_dev.dev)
1006                 return UBUS_STATUS_INVALID_ARGUMENT;
1007
1008         interface_set_main_dev(iface, NULL);
1009         return 0;
1010 }
1011
1012 static int
1013 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
1014 {
1015         struct device *mdev = iface->main_dev.dev;
1016
1017         if (mdev == dev)
1018                 return 0;
1019
1020         if (iface->main_dev.hotplug)
1021                 device_remove_user(&iface->main_dev);
1022
1023         if (mdev) {
1024                 if (mdev->hotplug_ops)
1025                         return mdev->hotplug_ops->add(mdev, dev);
1026                 else
1027                         return UBUS_STATUS_NOT_SUPPORTED;
1028         }
1029
1030         if (link_ext)
1031                 device_add_user(&iface->ext_dev, dev);
1032
1033         interface_set_main_dev(iface, dev);
1034         iface->main_dev.hotplug = true;
1035         return 0;
1036 }
1037
1038 int
1039 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
1040 {
1041         struct device *dev;
1042         int ret;
1043
1044         device_lock();
1045
1046         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1047         if (!dev) {
1048                 ret = UBUS_STATUS_NOT_FOUND;
1049                 goto out;
1050         }
1051
1052         if (add) {
1053                 interface_set_device_config(iface, dev);
1054                 device_set_present(dev, true);
1055
1056                 ret = interface_add_link(iface, dev, link_ext);
1057         } else {
1058                 ret = interface_remove_link(iface, dev);
1059         }
1060
1061 out:
1062         device_unlock();
1063
1064         return ret;
1065 }
1066
1067 void
1068 interface_set_up(struct interface *iface)
1069 {
1070         int ret;
1071         const char *error = NULL;
1072
1073         iface->autostart = true;
1074
1075         if (iface->state != IFS_DOWN)
1076                 return;
1077
1078         interface_clear_errors(iface);
1079         if (iface->available) {
1080                 if (iface->main_dev.dev) {
1081                         ret = device_claim(&iface->main_dev);
1082                         if (!ret)
1083                                 interface_check_state(iface);
1084                         else
1085                                 error = "DEVICE_CLAIM_FAILED";
1086                 } else {
1087                         ret = __interface_set_up(iface);
1088                         if (ret)
1089                                 error = "SETUP_FAILED";
1090                 }
1091         } else
1092                 error = "NO_DEVICE";
1093
1094         if (error)
1095                 interface_add_error(iface, "interface", error, NULL, 0);
1096 }
1097
1098 void
1099 interface_set_down(struct interface *iface)
1100 {
1101         if (!iface) {
1102                 vlist_for_each_element(&interfaces, iface, node)
1103                         __interface_set_down(iface, false);
1104         } else {
1105                 iface->autostart = false;
1106                 __interface_set_down(iface, false);
1107         }
1108 }
1109
1110 int
1111 interface_renew(struct interface *iface)
1112 {
1113         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1114                 return -1;
1115
1116         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1117 }
1118
1119 void
1120 interface_start_pending(void)
1121 {
1122         struct interface *iface;
1123
1124         vlist_for_each_element(&interfaces, iface, node) {
1125                 if (iface->autostart)
1126                         interface_set_up(iface);
1127         }
1128 }
1129
1130 static void
1131 set_config_state(struct interface *iface, enum interface_config_state s)
1132 {
1133         __set_config_state(iface, s);
1134         if (iface->state == IFS_DOWN)
1135                 interface_handle_config_change(iface);
1136         else
1137                 __interface_set_down(iface, false);
1138 }
1139
1140 void
1141 interface_update_start(struct interface *iface, const bool keep_old)
1142 {
1143         iface->updated = 0;
1144
1145         if (!keep_old)
1146                 interface_ip_update_start(&iface->proto_ip);
1147 }
1148
1149 void
1150 interface_update_complete(struct interface *iface)
1151 {
1152         interface_ip_update_complete(&iface->proto_ip);
1153 }
1154
1155 static void
1156 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1157 {
1158         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1159         vlist_simple_replace(&new->dns_search, &old->dns_search);
1160 }
1161
1162 static bool
1163 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1164 {
1165         struct blob_attr *ntb[__DEV_ATTR_MAX];
1166         struct blob_attr *otb[__DEV_ATTR_MAX];
1167         struct device *dev = if_old->main_dev.dev;
1168         unsigned long diff = 0;
1169
1170         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1171
1172         if (!dev)
1173                 return false;
1174
1175         if (if_old->device_config != if_new->device_config)
1176                 return true;
1177
1178         if (!if_new->device_config)
1179                 return false;
1180
1181         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1182                 blob_data(if_old->config), blob_len(if_old->config));
1183
1184         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1185                 blob_data(if_new->config), blob_len(if_new->config));
1186
1187         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1188         return diff;
1189 }
1190
1191 static void
1192 interface_change_config(struct interface *if_old, struct interface *if_new)
1193 {
1194         struct blob_attr *old_config = if_old->config;
1195         bool reload = false, reload_ip = false;
1196
1197 #define FIELD_CHANGED_STR(field)                                        \
1198                 ((!!if_old->field != !!if_new->field) ||                \
1199                  (if_old->field &&                                      \
1200                   strcmp(if_old->field, if_new->field) != 0))
1201
1202         if (FIELD_CHANGED_STR(parent_ifname)) {
1203                 if (if_old->parent_iface.iface)
1204                         interface_remove_user(&if_old->parent_iface);
1205                 reload = true;
1206         }
1207
1208         if (!reload && interface_device_config_changed(if_old, if_new))
1209                 reload = true;
1210
1211         if (FIELD_CHANGED_STR(ifname) ||
1212             if_old->proto_handler != if_new->proto_handler)
1213                 reload = true;
1214
1215         if (!if_old->proto_handler->config_params)
1216                 D(INTERFACE, "No config parameters for interface '%s'\n",
1217                   if_old->name);
1218         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1219                                        if_old->proto_handler->config_params))
1220                 reload = true;
1221
1222 #define UPDATE(field, __var) ({                                         \
1223                 bool __changed = (if_old->field != if_new->field);      \
1224                 if_old->field = if_new->field;                          \
1225                 __var |= __changed;                                     \
1226         })
1227
1228         if_old->config = if_new->config;
1229         if (if_old->config_autostart != if_new->config_autostart) {
1230                 if (if_old->config_autostart)
1231                         reload = true;
1232
1233                 if_old->autostart = if_new->config_autostart;
1234         }
1235
1236         if_old->device_config = if_new->device_config;
1237         if_old->config_autostart = if_new->config_autostart;
1238         if_old->ifname = if_new->ifname;
1239         if_old->parent_ifname = if_new->parent_ifname;
1240         if_old->dynamic = if_new->dynamic;
1241         if_old->proto_handler = if_new->proto_handler;
1242         if_old->force_link = if_new->force_link;
1243         if_old->dns_metric = if_new->dns_metric;
1244
1245         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1246         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1247
1248         UPDATE(metric, reload_ip);
1249         UPDATE(proto_ip.no_defaultroute, reload_ip);
1250         UPDATE(ip4table, reload_ip);
1251         UPDATE(ip6table, reload_ip);
1252         interface_merge_assignment_data(if_old, if_new);
1253
1254 #undef UPDATE
1255
1256         if (reload) {
1257                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1258                   if_old->name);
1259                 interface_clear_errors(if_old);
1260                 set_config_state(if_old, IFC_RELOAD);
1261                 goto out;
1262         }
1263
1264         if (reload_ip) {
1265                 bool config_ip_enabled = if_old->config_ip.enabled;
1266                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1267
1268                 interface_ip_set_enabled(&if_old->config_ip, false);
1269                 interface_ip_set_enabled(&if_old->proto_ip, false);
1270                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1271                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1272         }
1273
1274         interface_write_resolv_conf();
1275         if (if_old->main_dev.dev)
1276                 interface_check_state(if_old);
1277
1278 out:
1279         if_new->config = NULL;
1280         interface_cleanup(if_new);
1281         free(old_config);
1282         free(if_new);
1283 }
1284
1285 static void
1286 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1287                  struct vlist_node *node_old)
1288 {
1289         struct interface *if_old = container_of(node_old, struct interface, node);
1290         struct interface *if_new = container_of(node_new, struct interface, node);
1291
1292         if (node_old && node_new) {
1293                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1294                 interface_change_config(if_old, if_new);
1295         } else if (node_old) {
1296                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1297                 set_config_state(if_old, IFC_REMOVE);
1298         } else if (node_new) {
1299                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1300                 interface_event(if_new, IFEV_CREATE);
1301                 proto_init_interface(if_new, if_new->config);
1302                 interface_claim_device(if_new);
1303                 netifd_ubus_add_interface(if_new);
1304         }
1305 }
1306
1307
1308 static void __init
1309 interface_init_list(void)
1310 {
1311         vlist_init(&interfaces, avl_strcmp, interface_update);
1312         interfaces.keep_old = true;
1313         interfaces.no_delete = true;
1314 }