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