interface.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include "netifd.h"
  19 #include "device.h"
  20 #include "interface.h"
  21 #include "interface-ip.h"
  22 #include "proto.h"
  23 #include "ubus.h"
  24 #include "config.h"
  25 #include "system.h"
  26
  27 struct vlist_tree interfaces;
  28 static LIST_HEAD(iface_all_users);
  29
  30 enum {
  31         IFACE_ATTR_IFNAME,
  32         IFACE_ATTR_PROTO,
  33         IFACE_ATTR_AUTO,
  34         IFACE_ATTR_DEFAULTROUTE,
  35         IFACE_ATTR_PEERDNS,
  36         IFACE_ATTR_DNS,
  37         IFACE_ATTR_DNS_SEARCH,
  38         IFACE_ATTR_DNS_METRIC,
  39         IFACE_ATTR_METRIC,
  40         IFACE_ATTR_INTERFACE,
  41         IFACE_ATTR_IP6ASSIGN,
  42         IFACE_ATTR_IP6HINT,
  43         IFACE_ATTR_IP4TABLE,
  44         IFACE_ATTR_IP6TABLE,
  45         IFACE_ATTR_IP6CLASS,
  46         IFACE_ATTR_DELEGATE,
  47         IFACE_ATTR_IP6IFACEID,
  48         IFACE_ATTR_FORCE_LINK,
  49         IFACE_ATTR_IP6WEIGHT,
  50         IFACE_ATTR_MAX
  51 };
  52
  53 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  54         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  55         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  56         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  57         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  58         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  59         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  60         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  61         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  62         [IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
  63         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  65         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  69         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  70         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
  73 };
  74
  75 const struct uci_blob_param_list interface_attr_list = {
  76         .n_params = IFACE_ATTR_MAX,
  77         .params = iface_attrs,
  78 };
  79
  80 static void
  81 set_config_state(struct interface *iface, enum interface_config_state s);
  82 static void
  83 interface_event(struct interface *iface, enum interface_event ev);
  84
  85 static void
  86 interface_error_flush(struct interface *iface)
  87 {
  88         struct interface_error *error, *tmp;
  89
  90         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  91                 list_del(&error->list);
  92                 free(error);
  93         }
  94 }
  95
  96 static void
  97 interface_clear_errors(struct interface *iface)
  98 {
  99         /* don't flush the errors in case the configured protocol handler matches the
 100            running protocol handler and is having the last error capability */
 101         if (!(iface->proto &&
 102               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 103               (iface->proto->handler->name == iface->proto_handler->name)))
 104                 interface_error_flush(iface);
 105 }
 106
 107 void interface_add_error(struct interface *iface, const char *subsystem,
 108                          const char *code, const char **data, int n_data)
 109 {
 110         struct interface_error *error;
 111         int i, len = 0;
 112         int *datalen = NULL;
 113         char *dest, *d_subsys, *d_code;
 114
 115         /* if the configured protocol handler has the last error support capability,
 116            errors should only be added if the running protocol handler matches the
 117            configured one */
 118         if (iface->proto &&
 119             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 120             (iface->proto->handler->name != iface->proto_handler->name))
 121                 return;
 122
 123         if (n_data) {
 124                 len = n_data * sizeof(char *);
 125                 datalen = alloca(len);
 126                 for (i = 0; i < n_data; i++) {
 127                         datalen[i] = strlen(data[i]) + 1;
 128                         len += datalen[i];
 129                 }
 130         }
 131
 132         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 133                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 134                 &d_code, code ? strlen(code) + 1 : 0);
 135         if (!error)
 136                 return;
 137
 138         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 139            protocol can't be established (e.g auth failure) */
 140         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 141                 interface_error_flush(iface);
 142
 143         list_add_tail(&error->list, &iface->errors);
 144
 145         dest = (char *) &error->data[n_data + 1];
 146         for (i = 0; i < n_data; i++) {
 147                 error->data[i] = dest;
 148                 memcpy(dest, data[i], datalen[i]);
 149                 dest += datalen[i];
 150         }
 151         error->data[n_data] = NULL;
 152
 153         if (subsystem)
 154                 error->subsystem = strcpy(d_subsys, subsystem);
 155
 156         if (code)
 157                 error->code = strcpy(d_code, code);
 158 }
 159
 160 static void
 161 interface_data_del(struct interface *iface, struct interface_data *data)
 162 {
 163         avl_delete(&iface->data, &data->node);
 164         free(data);
 165 }
 166
 167 static void
 168 interface_data_flush(struct interface *iface)
 169 {
 170         struct interface_data *d, *tmp;
 171
 172         avl_for_each_element_safe(&iface->data, d, node, tmp)
 173                 interface_data_del(iface, d);
 174 }
 175
 176 int
 177 interface_add_data(struct interface *iface, const struct blob_attr *data)
 178 {
 179         struct interface_data *n, *o;
 180
 181         if (!blobmsg_check_attr(data, true))
 182                 return UBUS_STATUS_INVALID_ARGUMENT;
 183
 184         const char *name = blobmsg_name(data);
 185         unsigned len = blob_pad_len(data);
 186
 187         o = avl_find_element(&iface->data, name, o, node);
 188         if (o) {
 189                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 190                         return 0;
 191
 192                 interface_data_del(iface, o);
 193         }
 194
 195         n = calloc(1, sizeof(*n) + len);
 196         if (!n)
 197                 return UBUS_STATUS_UNKNOWN_ERROR;
 198
 199         memcpy(n->data, data, len);
 200         n->node.key = blobmsg_name(n->data);
 201         avl_insert(&iface->data, &n->node);
 202
 203         iface->updated |= IUF_DATA;
 204         return 0;
 205 }
 206
 207 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 208 {
 209         struct blob_attr *cur;
 210         int rem, ret;
 211
 212         iface->updated = 0;
 213
 214         blob_for_each_attr(cur, attr, rem) {
 215                 ret = interface_add_data(iface, cur);
 216                 if (ret)
 217                         return ret;
 218         }
 219
 220         if (iface->updated && iface->state == IFS_UP)
 221                 interface_event(iface, IFEV_UPDATE);
 222
 223         return 0;
 224 }
 225
 226 static void
 227 interface_event(struct interface *iface, enum interface_event ev)
 228 {
 229         struct interface_user *dep, *tmp;
 230         struct device *adev = NULL;
 231
 232         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 233                 dep->cb(dep, iface, ev);
 234
 235         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 236                 dep->cb(dep, iface, ev);
 237
 238         switch (ev) {
 239         case IFEV_UP:
 240                 interface_error_flush(iface);
 241                 adev = iface->l3_dev.dev;
 242                 /* fall through */
 243         case IFEV_DOWN:
 244         case IFEV_UP_FAILED:
 245                 alias_notify_device(iface->name, adev);
 246                 break;
 247         default:
 248                 break;
 249         }
 250 }
 251
 252 static void
 253 interface_flush_state(struct interface *iface)
 254 {
 255         if (iface->l3_dev.dev)
 256                 device_release(&iface->l3_dev);
 257         interface_data_flush(iface);
 258 }
 259
 260 static void
 261 mark_interface_down(struct interface *iface)
 262 {
 263         enum interface_state state = iface->state;
 264
 265         if (state == IFS_DOWN)
 266                 return;
 267
 268         iface->link_up_event = false;
 269         iface->state = IFS_DOWN;
 270         if (state == IFS_UP)
 271                 interface_event(iface, IFEV_DOWN);
 272         else
 273                 interface_event(iface, IFEV_UP_FAILED);
 274         interface_ip_set_enabled(&iface->config_ip, false);
 275         interface_ip_set_enabled(&iface->proto_ip, false);
 276         interface_ip_flush(&iface->proto_ip);
 277         interface_flush_state(iface);
 278         system_flush_routes();
 279 }
 280
 281 void
 282 __interface_set_down(struct interface *iface, bool force)
 283 {
 284         enum interface_state state = iface->state;
 285         switch (state) {
 286         case IFS_UP:
 287         case IFS_SETUP:
 288                 iface->state = IFS_TEARDOWN;
 289                 if (state == IFS_UP)
 290                         interface_event(iface, IFEV_DOWN);
 291
 292                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 293                 if (force)
 294                         interface_flush_state(iface);
 295                 break;
 296
 297         case IFS_DOWN:
 298                 if (iface->main_dev.dev)
 299                         device_release(&iface->main_dev);
 300         case IFS_TEARDOWN:
 301         default:
 302                 break;
 303         }
 304 }
 305
 306 static int
 307 __interface_set_up(struct interface *iface)
 308 {
 309         int ret;
 310
 311         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 312
 313         iface->state = IFS_SETUP;
 314         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 315         if (ret)
 316                 mark_interface_down(iface);
 317
 318         return ret;
 319 }
 320
 321 static void
 322 interface_check_state(struct interface *iface)
 323 {
 324         bool link_state = iface->link_state || iface->force_link;
 325
 326         switch (iface->state) {
 327         case IFS_UP:
 328         case IFS_SETUP:
 329                 if (!iface->enabled || !link_state) {
 330                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 331                         mark_interface_down(iface);
 332                 }
 333                 break;
 334         case IFS_DOWN:
 335                 if (!iface->available)
 336                         return;
 337
 338                 if (iface->autostart && iface->enabled && link_state && !config_init)
 339                         __interface_set_up(iface);
 340                 break;
 341         default:
 342                 break;
 343         }
 344 }
 345
 346 static void
 347 interface_set_enabled(struct interface *iface, bool new_state)
 348 {
 349         if (iface->enabled == new_state)
 350                 return;
 351
 352         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 353         iface->enabled = new_state;
 354         interface_check_state(iface);
 355 }
 356
 357 static void
 358 interface_set_link_state(struct interface *iface, bool new_state)
 359 {
 360         if (iface->link_state == new_state)
 361                 return;
 362
 363         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 364         iface->link_state = new_state;
 365         interface_check_state(iface);
 366
 367         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 368                 interface_event(iface, IFEV_LINK_UP);
 369                 iface->link_up_event = true;
 370         }
 371 }
 372
 373 static void
 374 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 375 {
 376         if (ev == DEV_EVENT_REMOVE)
 377                 device_remove_user(dep);
 378 }
 379
 380 static void
 381 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 382 {
 383         struct interface *iface;
 384         bool new_state = false;
 385
 386         iface = container_of(dep, struct interface, main_dev);
 387         switch (ev) {
 388         case DEV_EVENT_ADD:
 389                 new_state = true;
 390         case DEV_EVENT_REMOVE:
 391                 interface_set_available(iface, new_state);
 392                 if (!new_state && dep->dev && dep->dev->external)
 393                         interface_set_main_dev(iface, NULL);
 394                 break;
 395         case DEV_EVENT_UP:
 396                 new_state = true;
 397         case DEV_EVENT_DOWN:
 398                 interface_set_enabled(iface, new_state);
 399                 break;
 400         case DEV_EVENT_LINK_UP:
 401                 new_state = true;
 402         case DEV_EVENT_LINK_DOWN:
 403                 interface_set_link_state(iface, new_state);
 404                 break;
 405         case DEV_EVENT_TOPO_CHANGE:
 406                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 407                 return;
 408         default:
 409                 break;
 410         }
 411 }
 412
 413 static void
 414 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 415 {
 416         struct interface *iface;
 417
 418         iface = container_of(dep, struct interface, l3_dev);
 419         if (iface->l3_dev.dev == iface->main_dev.dev)
 420                 return;
 421
 422         switch (ev) {
 423         case DEV_EVENT_LINK_DOWN:
 424                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 425                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 426                 break;
 427         default:
 428                 break;
 429         }
 430 }
 431
 432 void
 433 interface_set_available(struct interface *iface, bool new_state)
 434 {
 435         if (iface->available == new_state)
 436                 return;
 437
 438         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 439         iface->available = new_state;
 440
 441         if (new_state) {
 442                 if (iface->autostart && !config_init)
 443                         interface_set_up(iface);
 444         } else
 445                 __interface_set_down(iface, true);
 446 }
 447
 448 void
 449 interface_add_user(struct interface_user *dep, struct interface *iface)
 450 {
 451         if (!iface) {
 452                 list_add(&dep->list, &iface_all_users);
 453                 return;
 454         }
 455
 456         dep->iface = iface;
 457         list_add(&dep->list, &iface->users);
 458         if (iface->state == IFS_UP)
 459                 dep->cb(dep, iface, IFEV_UP);
 460 }
 461
 462 void
 463 interface_remove_user(struct interface_user *dep)
 464 {
 465         list_del_init(&dep->list);
 466         dep->iface = NULL;
 467 }
 468
 469 static void
 470 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 471 {
 472         struct blob_attr *cur;
 473         int rem;
 474
 475         blobmsg_for_each_attr(cur, list, rem) {
 476                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 477                         continue;
 478
 479                 if (!blobmsg_check_attr(cur, NULL))
 480                         continue;
 481
 482                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 483                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 484                 list_add(&c->head, &iface->assignment_classes);
 485         }
 486 }
 487
 488 static void
 489 interface_clear_assignment_classes(struct interface *iface)
 490 {
 491         while (!list_empty(&iface->assignment_classes)) {
 492                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 493                                 struct interface_assignment_class, head);
 494                 list_del(&c->head);
 495                 free(c);
 496         }
 497 }
 498
 499 static void
 500 interface_merge_assignment_data(struct interface *old, struct interface *new)
 501 {
 502         bool changed = (old->assignment_hint != new->assignment_hint ||
 503                         old->assignment_length != new->assignment_length ||
 504                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 505                         old->assignment_weight != new->assignment_weight ||
 506                         (old->assignment_iface_id_selection == IFID_FIXED &&
 507                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 508                                 sizeof(old->assignment_fixed_iface_id))) ||
 509                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 510
 511         struct interface_assignment_class *c;
 512         list_for_each_entry(c, &new->assignment_classes, head) {
 513                 // Compare list entries one-by-one to see if there was a change
 514                 if (list_empty(&old->assignment_classes)) // The new list is longer
 515                         changed = true;
 516
 517                 if (changed)
 518                         break;
 519
 520                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 521                                 struct interface_assignment_class, head);
 522
 523                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 524                         break;
 525
 526                 list_del(&c_old->head);
 527                 free(c_old);
 528         }
 529
 530         // The old list was longer than the new one or the last entry didn't match
 531         if (!list_empty(&old->assignment_classes)) {
 532                 interface_clear_assignment_classes(old);
 533                 changed = true;
 534         }
 535
 536         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 537
 538         if (changed) {
 539                 old->assignment_hint = new->assignment_hint;
 540                 old->assignment_length = new->assignment_length;
 541                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 542                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 543                 old->assignment_weight = new->assignment_weight;
 544                 interface_refresh_assignments(true);
 545         }
 546 }
 547
 548 static void
 549 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 550 {
 551         struct interface *alias = container_of(dep, struct interface, parent_iface);
 552         struct device *dev = iface->l3_dev.dev;
 553
 554         switch (ev) {
 555         case IFEV_UP:
 556                 if (!dev)
 557                         return;
 558
 559                 interface_set_main_dev(alias, dev);
 560                 interface_set_available(alias, true);
 561                 break;
 562         case IFEV_DOWN:
 563         case IFEV_UP_FAILED:
 564                 interface_set_available(alias, false);
 565                 interface_set_main_dev(alias, NULL);
 566                 break;
 567         case IFEV_FREE:
 568                 interface_remove_user(dep);
 569                 break;
 570         default:
 571                 break;
 572         }
 573 }
 574
 575 static void
 576 interface_set_device_config(struct interface *iface, struct device *dev)
 577 {
 578         if (!dev || !dev->default_config)
 579                 return;
 580
 581         if (!iface->device_config &&
 582             (!dev->iface_config || dev->config_iface != iface))
 583                 return;
 584
 585         dev->config_iface = iface;
 586         dev->iface_config = iface->device_config;
 587         device_apply_config(dev, dev->type, iface->config);
 588 }
 589
 590 static void
 591 interface_claim_device(struct interface *iface)
 592 {
 593         struct interface *parent;
 594         struct device *dev = NULL;
 595
 596         if (iface->parent_iface.iface)
 597                 interface_remove_user(&iface->parent_iface);
 598
 599         device_lock();
 600
 601         if (iface->parent_ifname) {
 602                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 603                 iface->parent_iface.cb = interface_alias_cb;
 604                 interface_add_user(&iface->parent_iface, parent);
 605         } else if (iface->ifname &&
 606                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 607                 dev = device_get(iface->ifname, true);
 608                 interface_set_device_config(iface, dev);
 609         } else {
 610                 dev = iface->ext_dev.dev;
 611         }
 612
 613         if (dev)
 614                 interface_set_main_dev(iface, dev);
 615
 616         device_unlock();
 617
 618         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 619                 interface_set_available(iface, true);
 620 }
 621
 622 static void
 623 interface_cleanup_state(struct interface *iface)
 624 {
 625         interface_set_available(iface, false);
 626
 627         interface_flush_state(iface);
 628         interface_clear_errors(iface);
 629         interface_set_proto_state(iface, NULL);
 630
 631         interface_set_main_dev(iface, NULL);
 632         interface_set_l3_dev(iface, NULL);
 633 }
 634
 635 static void
 636 interface_cleanup(struct interface *iface)
 637 {
 638         struct interface_user *dep, *tmp;
 639
 640         uloop_timeout_cancel(&iface->remove_timer);
 641         device_remove_user(&iface->ext_dev);
 642
 643         if (iface->parent_iface.iface)
 644                 interface_remove_user(&iface->parent_iface);
 645
 646         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 647                 interface_remove_user(dep);
 648
 649         interface_clear_assignment_classes(iface);
 650         interface_ip_flush(&iface->config_ip);
 651         interface_cleanup_state(iface);
 652 }
 653
 654 static void
 655 interface_do_free(struct interface *iface)
 656 {
 657         interface_event(iface, IFEV_FREE);
 658         interface_cleanup(iface);
 659         free(iface->config);
 660         netifd_ubus_remove_interface(iface);
 661         avl_delete(&interfaces.avl, &iface->node.avl);
 662         free(iface);
 663 }
 664
 665 static void
 666 interface_do_reload(struct interface *iface)
 667 {
 668         interface_event(iface, IFEV_RELOAD);
 669         interface_cleanup_state(iface);
 670         proto_init_interface(iface, iface->config);
 671         interface_claim_device(iface);
 672 }
 673
 674 static void
 675 interface_handle_config_change(struct interface *iface)
 676 {
 677         enum interface_config_state state = iface->config_state;
 678
 679         iface->config_state = IFC_NORMAL;
 680         switch(state) {
 681         case IFC_NORMAL:
 682                 break;
 683         case IFC_RELOAD:
 684                 interface_do_reload(iface);
 685                 break;
 686         case IFC_REMOVE:
 687                 interface_do_free(iface);
 688                 return;
 689         }
 690         if (iface->autostart && iface->available)
 691                 interface_set_up(iface);
 692         else if (iface->dynamic)
 693                 set_config_state(iface, IFC_REMOVE);
 694 }
 695
 696 static void
 697 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 698 {
 699         struct interface *iface = state->iface;
 700
 701         switch (ev) {
 702         case IFPEV_UP:
 703                 if (iface->state != IFS_SETUP) {
 704                         if (iface->state == IFS_UP && iface->updated)
 705                                 interface_event(iface, IFEV_UPDATE);
 706                         return;
 707                 }
 708
 709                 if (!iface->l3_dev.dev)
 710                         interface_set_l3_dev(iface, iface->main_dev.dev);
 711
 712                 interface_ip_set_enabled(&iface->config_ip, true);
 713                 interface_ip_set_enabled(&iface->proto_ip, true);
 714                 system_flush_routes();
 715                 iface->state = IFS_UP;
 716                 iface->start_time = system_get_rtime();
 717                 interface_event(iface, IFEV_UP);
 718                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 719                 break;
 720         case IFPEV_DOWN:
 721                 if (iface->state == IFS_DOWN)
 722                         return;
 723
 724                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 725                 mark_interface_down(iface);
 726                 if (iface->main_dev.dev)
 727                         device_release(&iface->main_dev);
 728                 if (iface->l3_dev.dev)
 729                         device_remove_user(&iface->l3_dev);
 730                 interface_handle_config_change(iface);
 731                 break;
 732         case IFPEV_LINK_LOST:
 733                 if (iface->state != IFS_UP)
 734                         return;
 735
 736                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 737                 mark_interface_down(iface);
 738                 iface->state = IFS_SETUP;
 739                 break;
 740         default:
 741                 return;
 742         }
 743
 744         interface_write_resolv_conf();
 745 }
 746
 747 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 748 {
 749         if (iface->proto) {
 750                 iface->proto->free(iface->proto);
 751                 iface->proto = NULL;
 752         }
 753         iface->state = IFS_DOWN;
 754         iface->proto = state;
 755         if (!state)
 756                 return;
 757
 758         state->proto_event = interface_proto_event_cb;
 759         state->iface = iface;
 760 }
 761
 762 struct interface *
 763 interface_alloc(const char *name, struct blob_attr *config)
 764 {
 765         struct interface *iface;
 766         struct blob_attr *tb[IFACE_ATTR_MAX];
 767         struct blob_attr *cur;
 768         const char *proto_name = NULL;
 769         char *iface_name;
 770         bool force_link = false;
 771
 772         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 773         iface->name = strcpy(iface_name, name);
 774         INIT_LIST_HEAD(&iface->errors);
 775         INIT_LIST_HEAD(&iface->users);
 776         INIT_LIST_HEAD(&iface->hotplug_list);
 777         INIT_LIST_HEAD(&iface->assignment_classes);
 778         interface_ip_init(iface);
 779         avl_init(&iface->data, avl_strcmp, false, NULL);
 780         iface->config_ip.enabled = false;
 781
 782         iface->main_dev.cb = interface_main_dev_cb;
 783         iface->l3_dev.cb = interface_l3_dev_cb;
 784         iface->ext_dev.cb = interface_ext_dev_cb;
 785
 786         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 787                       blob_data(config), blob_len(config));
 788
 789         if ((cur = tb[IFACE_ATTR_PROTO]))
 790                 proto_name = blobmsg_data(cur);
 791
 792         proto_attach_interface(iface, proto_name);
 793         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 794                 force_link = true;
 795
 796         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 797         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 798         iface->proto_ip.no_defaultroute =
 799                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 800         iface->proto_ip.no_dns =
 801                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 802
 803         if ((cur = tb[IFACE_ATTR_DNS]))
 804                 interface_add_dns_server_list(&iface->config_ip, cur);
 805
 806         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 807                 interface_add_dns_search_list(&iface->config_ip, cur);
 808
 809         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 810                 iface->dns_metric = blobmsg_get_u32(cur);
 811
 812         if ((cur = tb[IFACE_ATTR_METRIC]))
 813                 iface->metric = blobmsg_get_u32(cur);
 814
 815         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 816                 iface->assignment_length = blobmsg_get_u32(cur);
 817
 818         /* defaults */
 819         iface->assignment_iface_id_selection = IFID_FIXED;
 820         iface->assignment_fixed_iface_id = in6addr_any;
 821         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 822
 823         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 824                 const char *ifaceid = blobmsg_data(cur);
 825                 if (!strcmp(ifaceid, "random")) {
 826                         iface->assignment_iface_id_selection = IFID_RANDOM;
 827                 }
 828                 else if (!strcmp(ifaceid, "eui64")) {
 829                         iface->assignment_iface_id_selection = IFID_EUI64;
 830                 }
 831                 else {
 832                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 833                            if we cannot parse -> revert to iface id 1 */
 834                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 835                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 836                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 837                                 iface->assignment_fixed_iface_id = in6addr_any;
 838                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 839                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 840                                                         falling back to iface id 1.\n", iface->name);
 841                         }
 842                 }
 843         }
 844
 845         iface->assignment_hint = -1;
 846         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 847                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 848                                 ~((1 << (64 - iface->assignment_length)) - 1);
 849
 850         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 851                 interface_add_assignment_classes(iface, cur);
 852
 853         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 854                 iface->assignment_weight = blobmsg_get_u32(cur);
 855
 856         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 857                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 858                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 859         }
 860
 861         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 862                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 863                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 864         }
 865
 866         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 867
 868         iface->config_autostart = iface->autostart;
 869         return iface;
 870 }
 871
 872 void interface_set_dynamic(struct interface *iface)
 873 {
 874         iface->dynamic = true;
 875         iface->autostart = true;
 876         iface->node.version = -1; // Don't delete on reload
 877 }
 878
 879 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 880 {
 881         struct blob_attr *tb[IFACE_ATTR_MAX];
 882         struct blob_attr *cur;
 883
 884         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 885                       blob_data(config), blob_len(config));
 886
 887         if (alias) {
 888                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 889                         iface->parent_ifname = blobmsg_data(cur);
 890
 891                 if (!iface->parent_ifname)
 892                         return false;
 893         } else {
 894                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 895                         iface->ifname = blobmsg_data(cur);
 896         }
 897
 898         iface->config = config;
 899         vlist_add(&interfaces, &iface->node, iface->name);
 900         return true;
 901 }
 902
 903 void
 904 interface_add(struct interface *iface, struct blob_attr *config)
 905 {
 906         __interface_add(iface, config, false);
 907 }
 908
 909 bool
 910 interface_add_alias(struct interface *iface, struct blob_attr *config)
 911 {
 912         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 913                 return false;
 914
 915         return __interface_add(iface, config, true);
 916 }
 917
 918 void
 919 interface_set_l3_dev(struct interface *iface, struct device *dev)
 920 {
 921         bool enabled = iface->config_ip.enabled;
 922         bool claimed = iface->l3_dev.claimed;
 923
 924         if (iface->l3_dev.dev == dev)
 925                 return;
 926
 927         interface_ip_set_enabled(&iface->config_ip, false);
 928         interface_ip_set_enabled(&iface->proto_ip, false);
 929         interface_ip_flush(&iface->proto_ip);
 930         device_add_user(&iface->l3_dev, dev);
 931
 932         if (dev) {
 933                 if (claimed) {
 934                         if (device_claim(&iface->l3_dev) < 0)
 935                                 return;
 936                 }
 937                 interface_ip_set_enabled(&iface->config_ip, enabled);
 938                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 939         }
 940 }
 941
 942 void
 943 interface_set_main_dev(struct interface *iface, struct device *dev)
 944 {
 945         bool claimed = iface->l3_dev.claimed;
 946
 947         if (iface->main_dev.dev == dev)
 948                 return;
 949
 950         interface_set_available(iface, false);
 951         device_add_user(&iface->main_dev, dev);
 952         if (!dev) {
 953                 interface_set_link_state(iface, false);
 954                 return;
 955         }
 956
 957         if (claimed) {
 958                 if (device_claim(&iface->l3_dev) < 0)
 959                         return;
 960         }
 961
 962         if (!iface->l3_dev.dev)
 963                 interface_set_l3_dev(iface, dev);
 964 }
 965
 966 int
 967 interface_remove_link(struct interface *iface, struct device *dev)
 968 {
 969         struct device *mdev = iface->main_dev.dev;
 970
 971         if (mdev && mdev->hotplug_ops)
 972                 return mdev->hotplug_ops->del(mdev, dev);
 973
 974         if (dev == iface->ext_dev.dev)
 975                 device_remove_user(&iface->ext_dev);
 976
 977         if (!iface->main_dev.hotplug)
 978                 return UBUS_STATUS_INVALID_ARGUMENT;
 979
 980         if (dev != iface->main_dev.dev)
 981                 return UBUS_STATUS_INVALID_ARGUMENT;
 982
 983         interface_set_main_dev(iface, NULL);
 984         return 0;
 985 }
 986
 987 static int
 988 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 989 {
 990         struct device *mdev = iface->main_dev.dev;
 991
 992         if (mdev == dev)
 993                 return 0;
 994
 995         if (iface->main_dev.hotplug)
 996                 device_remove_user(&iface->main_dev);
 997
 998         if (mdev) {
 999                 if (mdev->hotplug_ops)
1000                         return mdev->hotplug_ops->add(mdev, dev);
1001                 else
1002                         return UBUS_STATUS_NOT_SUPPORTED;
1003         }
1004
1005         if (link_ext)
1006                 device_add_user(&iface->ext_dev, dev);
1007
1008         interface_set_main_dev(iface, dev);
1009         iface->main_dev.hotplug = true;
1010         return 0;
1011 }
1012
1013 int
1014 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
1015 {
1016         struct device *dev;
1017         int ret;
1018
1019         device_lock();
1020
1021         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1022         if (!dev) {
1023                 ret = UBUS_STATUS_NOT_FOUND;
1024                 goto out;
1025         }
1026
1027         if (add) {
1028                 interface_set_device_config(iface, dev);
1029                 device_set_present(dev, true);
1030
1031                 ret = interface_add_link(iface, dev, link_ext);
1032         } else {
1033                 ret = interface_remove_link(iface, dev);
1034         }
1035
1036 out:
1037         device_unlock();
1038
1039         return ret;
1040 }
1041
1042 int
1043 interface_set_up(struct interface *iface)
1044 {
1045         int ret;
1046
1047         iface->autostart = true;
1048
1049         if (iface->state != IFS_DOWN)
1050                 return 0;
1051
1052         interface_clear_errors(iface);
1053         if (!iface->available) {
1054                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
1055                 return -1;
1056         }
1057
1058         if (iface->main_dev.dev) {
1059                 ret = device_claim(&iface->main_dev);
1060                 if (!ret)
1061                         interface_check_state(iface);
1062         }
1063         else
1064                 ret = __interface_set_up(iface);
1065
1066         return ret;
1067 }
1068
1069 int
1070 interface_set_down(struct interface *iface)
1071 {
1072         if (!iface) {
1073                 vlist_for_each_element(&interfaces, iface, node)
1074                         __interface_set_down(iface, false);
1075         } else {
1076                 iface->autostart = false;
1077                 __interface_set_down(iface, false);
1078         }
1079
1080         return 0;
1081 }
1082
1083 int
1084 interface_renew(struct interface *iface)
1085 {
1086         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1087                 return -1;
1088
1089         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1090 }
1091
1092 void
1093 interface_start_pending(void)
1094 {
1095         struct interface *iface;
1096
1097         vlist_for_each_element(&interfaces, iface, node) {
1098                 if (iface->available && iface->autostart)
1099                         interface_set_up(iface);
1100         }
1101 }
1102
1103 static void
1104 set_config_state(struct interface *iface, enum interface_config_state s)
1105 {
1106         iface->config_state = s;
1107         if (iface->state == IFS_DOWN)
1108                 interface_handle_config_change(iface);
1109         else
1110                 __interface_set_down(iface, false);
1111 }
1112
1113 void
1114 interface_update_start(struct interface *iface, const bool keep_old)
1115 {
1116         iface->updated = 0;
1117
1118         if (!keep_old)
1119                 interface_ip_update_start(&iface->proto_ip);
1120 }
1121
1122 void
1123 interface_update_complete(struct interface *iface)
1124 {
1125         interface_ip_update_complete(&iface->proto_ip);
1126 }
1127
1128 static void
1129 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1130 {
1131         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1132         vlist_simple_replace(&new->dns_search, &old->dns_search);
1133 }
1134
1135 static bool
1136 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1137 {
1138         struct blob_attr *ntb[__DEV_ATTR_MAX];
1139         struct blob_attr *otb[__DEV_ATTR_MAX];
1140         struct device *dev = if_old->main_dev.dev;
1141         unsigned long diff = 0;
1142
1143         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1144
1145         if (!dev)
1146                 return false;
1147
1148         if (if_old->device_config != if_new->device_config)
1149                 return true;
1150
1151         if (!if_new->device_config)
1152                 return false;
1153
1154         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1155                 blob_data(if_old->config), blob_len(if_old->config));
1156
1157         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1158                 blob_data(if_new->config), blob_len(if_new->config));
1159
1160         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1161         return diff;
1162 }
1163
1164 static void
1165 interface_change_config(struct interface *if_old, struct interface *if_new)
1166 {
1167         struct blob_attr *old_config = if_old->config;
1168         bool reload = false, reload_ip = false;
1169
1170 #define FIELD_CHANGED_STR(field)                                        \
1171                 ((!!if_old->field != !!if_new->field) ||                \
1172                  (if_old->field &&                                      \
1173                   strcmp(if_old->field, if_new->field) != 0))
1174
1175         if (FIELD_CHANGED_STR(parent_ifname)) {
1176                 if (if_old->parent_iface.iface)
1177                         interface_remove_user(&if_old->parent_iface);
1178                 reload = true;
1179         }
1180
1181         if (!reload && interface_device_config_changed(if_old, if_new))
1182                 reload = true;
1183
1184         if (FIELD_CHANGED_STR(ifname) ||
1185             if_old->proto_handler != if_new->proto_handler)
1186                 reload = true;
1187
1188         if (!if_old->proto_handler->config_params)
1189                 D(INTERFACE, "No config parameters for interface '%s'\n",
1190                   if_old->name);
1191         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1192                                        if_old->proto_handler->config_params))
1193                 reload = true;
1194
1195 #define UPDATE(field, __var) ({                                         \
1196                 bool __changed = (if_old->field != if_new->field);      \
1197                 if_old->field = if_new->field;                          \
1198                 __var |= __changed;                                     \
1199         })
1200
1201         if_old->config = if_new->config;
1202         if (if_old->config_autostart != if_new->config_autostart) {
1203                 if (if_old->config_autostart)
1204                         reload = true;
1205
1206                 if_old->autostart = if_new->config_autostart;
1207         }
1208
1209         if_old->device_config = if_new->device_config;
1210         if_old->config_autostart = if_new->config_autostart;
1211         if_old->ifname = if_new->ifname;
1212         if_old->parent_ifname = if_new->parent_ifname;
1213         if_old->proto_handler = if_new->proto_handler;
1214         if_old->force_link = if_new->force_link;
1215         if_old->dns_metric = if_new->dns_metric;
1216
1217         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1218         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1219
1220         UPDATE(metric, reload_ip);
1221         UPDATE(proto_ip.no_defaultroute, reload_ip);
1222         UPDATE(ip4table, reload_ip);
1223         UPDATE(ip6table, reload_ip);
1224         interface_merge_assignment_data(if_old, if_new);
1225
1226 #undef UPDATE
1227
1228         if (reload) {
1229                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1230                   if_old->name);
1231                 interface_clear_errors(if_old);
1232                 set_config_state(if_old, IFC_RELOAD);
1233                 goto out;
1234         }
1235
1236         if (reload_ip) {
1237                 bool config_ip_enabled = if_old->config_ip.enabled;
1238                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1239
1240                 interface_ip_set_enabled(&if_old->config_ip, false);
1241                 interface_ip_set_enabled(&if_old->proto_ip, false);
1242                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1243                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1244         }
1245
1246         interface_write_resolv_conf();
1247         if (if_old->main_dev.dev)
1248                 interface_check_state(if_old);
1249
1250 out:
1251         if_new->config = NULL;
1252         interface_cleanup(if_new);
1253         free(old_config);
1254         free(if_new);
1255 }
1256
1257 static void
1258 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1259                  struct vlist_node *node_old)
1260 {
1261         struct interface *if_old = container_of(node_old, struct interface, node);
1262         struct interface *if_new = container_of(node_new, struct interface, node);
1263
1264         if (node_old && node_new) {
1265                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1266                 interface_change_config(if_old, if_new);
1267         } else if (node_old) {
1268                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1269                 set_config_state(if_old, IFC_REMOVE);
1270         } else if (node_new) {
1271                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1272                 proto_init_interface(if_new, if_new->config);
1273                 interface_claim_device(if_new);
1274                 netifd_ubus_add_interface(if_new);
1275         }
1276 }
1277
1278
1279 static void __init
1280 interface_init_list(void)
1281 {
1282         vlist_init(&interfaces, avl_strcmp, interface_update);
1283         interfaces.keep_old = true;
1284         interfaces.no_delete = true;
1285 }