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