interface.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include "netifd.h"
   6 #include "device.h"
   7 #include "interface.h"
   8 #include "interface-ip.h"
   9 #include "proto.h"
  10 #include "ubus.h"
  11 #include "config.h"
  12 #include "system.h"
  13
  14 struct vlist_tree interfaces;
  15
  16 enum {
  17         IFACE_ATTR_IFNAME,
  18         IFACE_ATTR_PROTO,
  19         IFACE_ATTR_AUTO,
  20         IFACE_ATTR_DEFAULTROUTE,
  21         IFACE_ATTR_METRIC,
  22         IFACE_ATTR_MAX
  23 };
  24
  25 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  26         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  27         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  28         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  29         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  30         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  31 };
  32
  33 const struct config_param_list interface_attr_list = {
  34         .n_params = IFACE_ATTR_MAX,
  35         .params = iface_attrs,
  36 };
  37
  38 static void
  39 interface_clear_errors(struct interface *iface)
  40 {
  41         struct interface_error *error, *tmp;
  42
  43         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  44                 list_del(&error->list);
  45                 free(error);
  46         }
  47 }
  48
  49 void interface_add_error(struct interface *iface, const char *subsystem,
  50                          const char *code, const char **data, int n_data)
  51 {
  52         struct interface_error *error;
  53         int i, len = 0;
  54         int *datalen = NULL;
  55         char *dest;
  56
  57         if (n_data) {
  58                 len = n_data * sizeof(char *);
  59                 datalen = alloca(len);
  60                 for (i = 0; i < n_data; i++) {
  61                         datalen[i] = strlen(data[i]) + 1;
  62                         len += datalen[i];
  63                 }
  64         }
  65
  66         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  67         if (!error)
  68                 return;
  69
  70         list_add_tail(&error->list, &iface->errors);
  71         error->subsystem = subsystem;
  72         error->code = code;
  73
  74         dest = (char *) &error->data[n_data + 1];
  75         for (i = 0; i < n_data; i++) {
  76                 error->data[i] = dest;
  77                 memcpy(dest, data[i], datalen[i]);
  78                 dest += datalen[i];
  79         }
  80         error->data[n_data] = NULL;
  81 }
  82
  83 static void
  84 interface_data_del(struct interface *iface, struct interface_data *data)
  85 {
  86         avl_delete(&iface->data, &data->node);
  87         free(data);
  88 }
  89
  90 static void
  91 interface_data_flush(struct interface *iface)
  92 {
  93         struct interface_data *d, *tmp;
  94
  95         avl_for_each_element_safe(&iface->data, d, node, tmp)
  96                 interface_data_del(iface, d);
  97 }
  98
  99 int
 100 interface_add_data(struct interface *iface, const struct blob_attr *data)
 101 {
 102         struct interface_data *n, *o;
 103
 104         if (!blobmsg_check_attr(data, true))
 105                 return UBUS_STATUS_INVALID_ARGUMENT;
 106
 107         n = calloc(1, sizeof(*data) + blob_pad_len(data));
 108         memcpy(n->data, data, blob_pad_len(data));
 109         n->node.key = blobmsg_name(data);
 110
 111         o = avl_find_element(&iface->data, n->node.key, o, node);
 112         if (o)
 113                 interface_data_del(iface, o);
 114
 115         avl_insert(&iface->data, &n->node);
 116         return 0;
 117 }
 118
 119 static void
 120 interface_event(struct interface *iface, enum interface_event ev)
 121 {
 122         struct interface_user *dep, *tmp;
 123
 124         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 125                 dep->cb(dep, IFEV_UP);
 126
 127         interface_queue_event(iface, ev);
 128 }
 129
 130 static void
 131 interface_flush_state(struct interface *iface)
 132 {
 133         if (iface->main_dev.dev)
 134                 device_release(&iface->main_dev);
 135         if (iface->l3_dev.dev)
 136                 device_release(&iface->l3_dev);
 137         interface_data_flush(iface);
 138 }
 139
 140 static void
 141 mark_interface_down(struct interface *iface)
 142 {
 143         if (iface->state == IFS_UP)
 144                 interface_event(iface, IFEV_DOWN);
 145         interface_ip_flush(&iface->config_ip);
 146         interface_ip_flush(&iface->proto_ip);
 147         interface_flush_state(iface);
 148         iface->state = IFS_DOWN;
 149 }
 150
 151 void
 152 __interface_set_down(struct interface *iface, bool force)
 153 {
 154         interface_clear_errors(iface);
 155
 156         if (iface->state == IFS_DOWN ||
 157                 iface->state == IFS_TEARDOWN)
 158                 return;
 159
 160         if (iface->state == IFS_UP)
 161                 interface_event(iface, IFEV_DOWN);
 162         iface->state = IFS_TEARDOWN;
 163         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 164         if (force)
 165                 interface_flush_state(iface);
 166 }
 167
 168 static void
 169 interface_cb(struct device_user *dep, enum device_event ev)
 170 {
 171         struct interface *iface;
 172         bool new_state;
 173
 174         iface = container_of(dep, struct interface, main_dev);
 175         switch (ev) {
 176         case DEV_EVENT_ADD:
 177                 new_state = true;
 178                 break;
 179         case DEV_EVENT_REMOVE:
 180                 new_state = false;
 181                 break;
 182         default:
 183                 return;
 184         }
 185
 186         interface_set_available(iface, new_state);
 187 }
 188
 189 void
 190 interface_set_available(struct interface *iface, bool new_state)
 191 {
 192         if (iface->available == new_state)
 193                 return;
 194
 195         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 196         iface->available = new_state;
 197
 198         if (new_state) {
 199                 if (iface->autostart && !config_init)
 200                         interface_set_up(iface);
 201         } else
 202                 __interface_set_down(iface, true);
 203 }
 204
 205 void
 206 interface_add_user(struct interface_user *dep, struct interface *iface)
 207 {
 208         dep->iface = iface;
 209         list_add(&dep->list, &iface->users);
 210         if (iface->state == IFS_UP)
 211                 dep->cb(dep, IFEV_UP);
 212 }
 213
 214 void
 215 interface_remove_user(struct interface_user *dep)
 216 {
 217         list_del_init(&dep->list);
 218         dep->iface = NULL;
 219 }
 220
 221 static void
 222 interface_claim_device(struct interface *iface)
 223 {
 224         struct device *dev;
 225
 226         if (iface->ifname &&
 227                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 228                 dev = device_get(iface->ifname, true);
 229                 if (dev)
 230                         interface_set_main_dev(iface, dev);
 231         }
 232         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 233                 interface_set_available(iface, true);
 234 }
 235
 236
 237 static void
 238 interface_cleanup(struct interface *iface, bool reload)
 239 {
 240         struct interface_user *dep, *tmp;
 241
 242         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 243                 interface_remove_user(dep);
 244
 245         interface_dequeue_event(iface);
 246         interface_ip_flush(&iface->config_ip);
 247         interface_flush_state(iface);
 248         interface_clear_errors(iface);
 249         if (iface->main_dev.dev &&
 250             (!reload || !iface->main_dev.hotplug))
 251                 interface_set_main_dev(iface, NULL);
 252         interface_set_proto_state(iface, NULL);
 253 }
 254
 255 static void
 256 interface_do_free(struct interface *iface)
 257 {
 258         interface_cleanup(iface, false);
 259         free(iface->config);
 260         netifd_ubus_remove_interface(iface);
 261         avl_delete(&interfaces.avl, &iface->node.avl);
 262         free(iface);
 263 }
 264
 265 static void
 266 interface_do_reload(struct interface *iface)
 267 {
 268         interface_cleanup(iface, true);
 269         proto_init_interface(iface, iface->config);
 270         interface_claim_device(iface);
 271 }
 272
 273 static void
 274 interface_handle_config_change(struct interface *iface)
 275 {
 276         switch(iface->config_state) {
 277         case IFC_NORMAL:
 278                 break;
 279         case IFC_RELOAD:
 280                 interface_do_reload(iface);
 281                 break;
 282         case IFC_REMOVE:
 283                 interface_do_free(iface);
 284                 return;
 285         }
 286         if (iface->autostart && iface->available)
 287                 interface_set_up(iface);
 288 }
 289
 290 static void
 291 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 292 {
 293         struct interface *iface = state->iface;
 294
 295         switch (ev) {
 296         case IFPEV_UP:
 297                 if (iface->state != IFS_SETUP)
 298                         return;
 299
 300                 interface_ip_set_enabled(&iface->config_ip, true);
 301                 system_flush_routes();
 302                 iface->state = IFS_UP;
 303                 iface->start_time = system_get_rtime();
 304                 interface_event(iface, IFEV_UP);
 305                 interface_write_resolv_conf();
 306                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 307                 break;
 308         case IFPEV_DOWN:
 309                 if (iface->state == IFS_DOWN)
 310                         return;
 311
 312                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 313                 interface_ip_set_enabled(&iface->config_ip, false);
 314                 mark_interface_down(iface);
 315                 system_flush_routes();
 316                 interface_handle_config_change(iface);
 317                 break;
 318         case IFPEV_LINK_LOST:
 319                 if (iface->state != IFS_UP)
 320                         return;
 321
 322                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 323                 if (iface->state == IFS_UP)
 324                         interface_event(iface, IFEV_DOWN);
 325                 mark_interface_down(iface);
 326                 system_flush_routes();
 327                 iface->state = IFS_SETUP;
 328                 break;
 329         }
 330 }
 331
 332 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 333 {
 334         if (iface->proto) {
 335                 iface->proto->free(iface->proto);
 336                 iface->proto = NULL;
 337         }
 338         iface->state = IFS_DOWN;
 339         iface->proto = state;
 340         if (!state)
 341                 return;
 342
 343         state->proto_event = interface_proto_cb;
 344         state->iface = iface;
 345 }
 346
 347 void
 348 interface_init(struct interface *iface, const char *name,
 349                struct blob_attr *config)
 350 {
 351         struct blob_attr *tb[IFACE_ATTR_MAX];
 352         struct blob_attr *cur;
 353         const char *proto_name = NULL;
 354
 355         strncpy(iface->name, name, sizeof(iface->name) - 1);
 356         INIT_LIST_HEAD(&iface->errors);
 357         INIT_LIST_HEAD(&iface->users);
 358         INIT_LIST_HEAD(&iface->hotplug_list);
 359         interface_ip_init(&iface->proto_ip, iface);
 360         interface_ip_init(&iface->config_ip, iface);
 361         avl_init(&iface->data, avl_strcmp, false, NULL);
 362         iface->config_ip.enabled = false;
 363
 364         iface->main_dev.cb = interface_cb;
 365
 366         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 367                       blob_data(config), blob_len(config));
 368
 369         if ((cur = tb[IFACE_ATTR_PROTO]))
 370                 proto_name = blobmsg_data(cur);
 371
 372         proto_attach_interface(iface, proto_name);
 373
 374         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 375         iface->proto_ip.no_defaultroute =
 376                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 377
 378         iface->config_autostart = iface->autostart;
 379 }
 380
 381 void
 382 interface_add(struct interface *iface, struct blob_attr *config)
 383 {
 384         struct blob_attr *tb[IFACE_ATTR_MAX];
 385         struct blob_attr *cur;
 386
 387         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 388                       blob_data(config), blob_len(config));
 389
 390         if ((cur = tb[IFACE_ATTR_IFNAME]))
 391                 iface->ifname = blobmsg_data(cur);
 392
 393         iface->config = config;
 394         vlist_add(&interfaces, &iface->node, iface->name);
 395 }
 396
 397 void
 398 interface_set_l3_dev(struct interface *iface, struct device *dev)
 399 {
 400         bool enabled = iface->config_ip.enabled;
 401         bool claimed = iface->l3_dev.claimed;
 402
 403         if (iface->l3_dev.dev == dev)
 404                 return;
 405
 406         interface_ip_set_enabled(&iface->config_ip, false);
 407         interface_ip_flush(&iface->proto_ip);
 408         device_add_user(&iface->l3_dev, dev);
 409
 410         if (dev) {
 411                 if (claimed)
 412                         device_claim(&iface->l3_dev);
 413                 interface_ip_set_enabled(&iface->config_ip, enabled);
 414         }
 415 }
 416
 417 void
 418 interface_set_main_dev(struct interface *iface, struct device *dev)
 419 {
 420         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 421         bool claimed = iface->l3_dev.claimed;
 422
 423         if (iface->main_dev.dev == dev)
 424                 return;
 425
 426         if (set_l3)
 427                 interface_set_l3_dev(iface, dev);
 428
 429         device_add_user(&iface->main_dev, dev);
 430         if (claimed)
 431                 device_claim(&iface->l3_dev);
 432
 433         if (!iface->l3_dev.dev)
 434                 interface_set_l3_dev(iface, dev);
 435 }
 436
 437 int
 438 interface_remove_link(struct interface *iface, struct device *dev)
 439 {
 440         struct device *mdev = iface->main_dev.dev;
 441
 442         if (mdev && mdev->hotplug_ops)
 443                 return mdev->hotplug_ops->del(mdev, dev);
 444
 445         if (!iface->main_dev.hotplug)
 446                 return UBUS_STATUS_INVALID_ARGUMENT;
 447
 448         if (dev != iface->main_dev.dev)
 449                 return UBUS_STATUS_INVALID_ARGUMENT;
 450
 451         device_remove_user(&iface->main_dev);
 452         return 0;
 453 }
 454
 455 int
 456 interface_add_link(struct interface *iface, struct device *dev)
 457 {
 458         struct device *mdev = iface->main_dev.dev;
 459
 460         if (mdev == dev)
 461                 return 0;
 462
 463         if (iface->main_dev.hotplug)
 464                 device_remove_user(&iface->main_dev);
 465
 466         if (mdev) {
 467                 if (mdev->hotplug_ops)
 468                         return mdev->hotplug_ops->add(mdev, dev);
 469                 else
 470                         return UBUS_STATUS_NOT_SUPPORTED;
 471         }
 472
 473         interface_set_main_dev(iface, dev);
 474         iface->main_dev.hotplug = true;
 475         return 0;
 476 }
 477
 478 int
 479 interface_set_up(struct interface *iface)
 480 {
 481         int ret;
 482
 483         iface->autostart = true;
 484
 485         if (iface->state != IFS_DOWN)
 486                 return 0;
 487
 488         interface_clear_errors(iface);
 489         if (!iface->available) {
 490                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 491                 return -1;
 492         }
 493
 494         if (iface->main_dev.dev) {
 495                 ret = device_claim(&iface->main_dev);
 496                 if (ret)
 497                         return ret;
 498         }
 499
 500         iface->state = IFS_SETUP;
 501         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 502         if (ret) {
 503                 mark_interface_down(iface);
 504                 return ret;
 505         }
 506
 507         return 0;
 508 }
 509
 510 int
 511 interface_set_down(struct interface *iface)
 512 {
 513         if (!iface) {
 514                 vlist_for_each_element(&interfaces, iface, node)
 515                         __interface_set_down(iface, false);
 516         } else {
 517                 iface->autostart = false;
 518                 __interface_set_down(iface, false);
 519         }
 520
 521         return 0;
 522 }
 523
 524 void
 525 interface_start_pending(void)
 526 {
 527         struct interface *iface;
 528
 529         vlist_for_each_element(&interfaces, iface, node) {
 530                 if (iface->available && iface->autostart)
 531                         interface_set_up(iface);
 532         }
 533 }
 534
 535 static void
 536 set_config_state(struct interface *iface, enum interface_config_state s)
 537 {
 538         iface->config_state = s;
 539         if (iface->state == IFS_DOWN)
 540                 interface_handle_config_change(iface);
 541         else
 542                 __interface_set_down(iface, false);
 543 }
 544
 545 void
 546 interface_update_start(struct interface *iface)
 547 {
 548         interface_ip_update_start(&iface->proto_ip);
 549 }
 550
 551 void
 552 interface_update_complete(struct interface *iface)
 553 {
 554         struct device_route *route;
 555
 556         interface_ip_update_complete(&iface->proto_ip);
 557         vlist_for_each_element(&iface->config_ip.route, route, node) {
 558                 if (iface->l3_dev.dev) {
 559                         system_add_route(iface->l3_dev.dev, route);
 560                         route->enabled = true;
 561                 }
 562         }
 563 }
 564
 565 static void
 566 interface_change_config(struct interface *if_old, struct interface *if_new)
 567 {
 568         struct blob_attr *old_config = if_old->config;
 569         const char *old_ifname = if_old->ifname;
 570         const struct proto_handler *proto = if_old->proto_handler;
 571
 572         interface_clear_errors(if_old);
 573         if_old->config = if_new->config;
 574         if (!if_old->config_autostart && if_new->config_autostart)
 575                 if_old->autostart = true;
 576
 577         if_old->config_autostart = if_new->config_autostart;
 578         if_old->ifname = if_new->ifname;
 579         if_old->proto_handler = if_new->proto_handler;
 580
 581         if ((!!old_ifname != !!if_new->ifname) ||
 582             (old_ifname && strcmp(old_ifname, if_new->ifname) != 0) ||
 583             proto != if_new->proto_handler) {
 584                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 585                   if_old->name);
 586                 goto reload;
 587         }
 588
 589         if (!proto->config_params)
 590                 D(INTERFACE, "No config parameters for interface '%s'\n",
 591                   if_old->name);
 592         else if (!config_check_equal(old_config, if_new->config,
 593                                 proto->config_params)) {
 594                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 595                   if_old->name);
 596                 goto reload;
 597         }
 598
 599 #define UPDATE(field) ({                                                \
 600                 bool __changed = (if_old->field != if_new->field);      \
 601                 if_old->field = if_new->field;                          \
 602                 __changed;                                              \
 603         })
 604
 605         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 606                 interface_ip_set_enabled(&if_old->config_ip, false);
 607                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 608                 interface_ip_set_enabled(&if_old->proto_ip, false);
 609                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 610         }
 611
 612 #undef UPDATE
 613
 614         goto out;
 615
 616 reload:
 617         set_config_state(if_old, IFC_RELOAD);
 618 out:
 619         free(old_config);
 620         free(if_new);
 621 }
 622
 623 static void
 624 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 625                  struct vlist_node *node_old)
 626 {
 627         struct interface *if_old = container_of(node_old, struct interface, node);
 628         struct interface *if_new = container_of(node_new, struct interface, node);
 629
 630         if (node_old && node_new) {
 631                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 632                 interface_change_config(if_old, if_new);
 633         } else if (node_old) {
 634                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 635                 set_config_state(if_old, IFC_REMOVE);
 636         } else if (node_new) {
 637                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 638                 proto_init_interface(if_new, if_new->config);
 639                 interface_claim_device(if_new);
 640                 netifd_ubus_add_interface(if_new);
 641         }
 642 }
 643
 644
 645 static void __init
 646 interface_init_list(void)
 647 {
 648         vlist_init(&interfaces, avl_strcmp, interface_update);
 649         interfaces.keep_old = true;
 650         interfaces.no_delete = true;
 651 }