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_set_enabled(&iface->config_ip, false);
 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                 mark_interface_down(iface);
 314                 system_flush_routes();
 315                 interface_handle_config_change(iface);
 316                 break;
 317         case IFPEV_LINK_LOST:
 318                 if (iface->state != IFS_UP)
 319                         return;
 320
 321                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 322                 if (iface->state == IFS_UP)
 323                         interface_event(iface, IFEV_DOWN);
 324                 mark_interface_down(iface);
 325                 system_flush_routes();
 326                 iface->state = IFS_SETUP;
 327                 break;
 328         }
 329 }
 330
 331 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 332 {
 333         if (iface->proto) {
 334                 iface->proto->free(iface->proto);
 335                 iface->proto = NULL;
 336         }
 337         iface->state = IFS_DOWN;
 338         iface->proto = state;
 339         if (!state)
 340                 return;
 341
 342         state->proto_event = interface_proto_cb;
 343         state->iface = iface;
 344 }
 345
 346 void
 347 interface_init(struct interface *iface, const char *name,
 348                struct blob_attr *config)
 349 {
 350         struct blob_attr *tb[IFACE_ATTR_MAX];
 351         struct blob_attr *cur;
 352         const char *proto_name = NULL;
 353
 354         strncpy(iface->name, name, sizeof(iface->name) - 1);
 355         INIT_LIST_HEAD(&iface->errors);
 356         INIT_LIST_HEAD(&iface->users);
 357         INIT_LIST_HEAD(&iface->hotplug_list);
 358         interface_ip_init(&iface->proto_ip, iface);
 359         interface_ip_init(&iface->config_ip, iface);
 360         avl_init(&iface->data, avl_strcmp, false, NULL);
 361         iface->config_ip.enabled = false;
 362
 363         iface->main_dev.cb = interface_cb;
 364
 365         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 366                       blob_data(config), blob_len(config));
 367
 368         if ((cur = tb[IFACE_ATTR_PROTO]))
 369                 proto_name = blobmsg_data(cur);
 370
 371         proto_attach_interface(iface, proto_name);
 372
 373         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 374         iface->proto_ip.no_defaultroute =
 375                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 376
 377         iface->config_autostart = iface->autostart;
 378 }
 379
 380 void
 381 interface_add(struct interface *iface, struct blob_attr *config)
 382 {
 383         struct blob_attr *tb[IFACE_ATTR_MAX];
 384         struct blob_attr *cur;
 385
 386         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 387                       blob_data(config), blob_len(config));
 388
 389         if ((cur = tb[IFACE_ATTR_IFNAME]))
 390                 iface->ifname = blobmsg_data(cur);
 391
 392         iface->config = config;
 393         vlist_add(&interfaces, &iface->node, iface->name);
 394 }
 395
 396 void
 397 interface_set_l3_dev(struct interface *iface, struct device *dev)
 398 {
 399         bool enabled = iface->config_ip.enabled;
 400         bool claimed = iface->l3_dev.claimed;
 401
 402         if (iface->l3_dev.dev == dev)
 403                 return;
 404
 405         interface_ip_set_enabled(&iface->config_ip, false);
 406         interface_ip_flush(&iface->proto_ip);
 407         device_add_user(&iface->l3_dev, dev);
 408
 409         if (dev) {
 410                 if (claimed)
 411                         device_claim(&iface->l3_dev);
 412                 interface_ip_set_enabled(&iface->config_ip, enabled);
 413         }
 414 }
 415
 416 void
 417 interface_set_main_dev(struct interface *iface, struct device *dev)
 418 {
 419         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 420         bool claimed = iface->l3_dev.claimed;
 421
 422         if (iface->main_dev.dev == dev)
 423                 return;
 424
 425         if (set_l3)
 426                 interface_set_l3_dev(iface, dev);
 427
 428         device_add_user(&iface->main_dev, dev);
 429         if (claimed)
 430                 device_claim(&iface->l3_dev);
 431
 432         if (!iface->l3_dev.dev)
 433                 interface_set_l3_dev(iface, dev);
 434 }
 435
 436 int
 437 interface_remove_link(struct interface *iface, struct device *dev)
 438 {
 439         struct device *mdev = iface->main_dev.dev;
 440
 441         if (mdev && mdev->hotplug_ops)
 442                 return mdev->hotplug_ops->del(mdev, dev);
 443
 444         if (!iface->main_dev.hotplug)
 445                 return UBUS_STATUS_INVALID_ARGUMENT;
 446
 447         if (dev != iface->main_dev.dev)
 448                 return UBUS_STATUS_INVALID_ARGUMENT;
 449
 450         device_remove_user(&iface->main_dev);
 451         return 0;
 452 }
 453
 454 int
 455 interface_add_link(struct interface *iface, struct device *dev)
 456 {
 457         struct device *mdev = iface->main_dev.dev;
 458
 459         if (mdev == dev)
 460                 return 0;
 461
 462         if (iface->main_dev.hotplug)
 463                 device_remove_user(&iface->main_dev);
 464
 465         if (mdev) {
 466                 if (mdev->hotplug_ops)
 467                         return mdev->hotplug_ops->add(mdev, dev);
 468                 else
 469                         return UBUS_STATUS_NOT_SUPPORTED;
 470         }
 471
 472         interface_set_main_dev(iface, dev);
 473         iface->main_dev.hotplug = true;
 474         return 0;
 475 }
 476
 477 int
 478 interface_set_up(struct interface *iface)
 479 {
 480         int ret;
 481
 482         iface->autostart = true;
 483
 484         if (iface->state != IFS_DOWN)
 485                 return 0;
 486
 487         interface_clear_errors(iface);
 488         if (!iface->available) {
 489                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 490                 return -1;
 491         }
 492
 493         if (iface->main_dev.dev) {
 494                 ret = device_claim(&iface->main_dev);
 495                 if (ret)
 496                         return ret;
 497         }
 498
 499         iface->state = IFS_SETUP;
 500         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 501         if (ret) {
 502                 mark_interface_down(iface);
 503                 return ret;
 504         }
 505
 506         return 0;
 507 }
 508
 509 int
 510 interface_set_down(struct interface *iface)
 511 {
 512         if (!iface) {
 513                 vlist_for_each_element(&interfaces, iface, node)
 514                         __interface_set_down(iface, false);
 515         } else {
 516                 iface->autostart = false;
 517                 __interface_set_down(iface, false);
 518         }
 519
 520         return 0;
 521 }
 522
 523 void
 524 interface_start_pending(void)
 525 {
 526         struct interface *iface;
 527
 528         vlist_for_each_element(&interfaces, iface, node) {
 529                 if (iface->available && iface->autostart)
 530                         interface_set_up(iface);
 531         }
 532 }
 533
 534 static void
 535 set_config_state(struct interface *iface, enum interface_config_state s)
 536 {
 537         iface->config_state = s;
 538         if (iface->state == IFS_DOWN)
 539                 interface_handle_config_change(iface);
 540         else
 541                 __interface_set_down(iface, false);
 542 }
 543
 544 void
 545 interface_update_start(struct interface *iface)
 546 {
 547         interface_ip_update_start(&iface->proto_ip);
 548 }
 549
 550 void
 551 interface_update_complete(struct interface *iface)
 552 {
 553         interface_ip_update_complete(&iface->proto_ip);
 554 }
 555
 556 static void
 557 interface_change_config(struct interface *if_old, struct interface *if_new)
 558 {
 559         struct blob_attr *old_config = if_old->config;
 560         const char *old_ifname = if_old->ifname;
 561         const struct proto_handler *proto = if_old->proto_handler;
 562
 563         interface_clear_errors(if_old);
 564         if_old->config = if_new->config;
 565         if (!if_old->config_autostart && if_new->config_autostart)
 566                 if_old->autostart = true;
 567
 568         if_old->config_autostart = if_new->config_autostart;
 569         if_old->ifname = if_new->ifname;
 570         if_old->proto_handler = if_new->proto_handler;
 571
 572         if ((!!old_ifname != !!if_new->ifname) ||
 573             (old_ifname && strcmp(old_ifname, if_new->ifname) != 0) ||
 574             proto != if_new->proto_handler) {
 575                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 576                   if_old->name);
 577                 goto reload;
 578         }
 579
 580         if (!proto->config_params)
 581                 D(INTERFACE, "No config parameters for interface '%s'\n",
 582                   if_old->name);
 583         else if (!config_check_equal(old_config, if_new->config,
 584                                 proto->config_params)) {
 585                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 586                   if_old->name);
 587                 goto reload;
 588         }
 589
 590 #define UPDATE(field) ({                                                \
 591                 bool __changed = (if_old->field != if_new->field);      \
 592                 if_old->field = if_new->field;                          \
 593                 __changed;                                              \
 594         })
 595
 596         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 597                 interface_ip_set_enabled(&if_old->config_ip, false);
 598                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 599                 interface_ip_set_enabled(&if_old->proto_ip, false);
 600                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 601         }
 602
 603 #undef UPDATE
 604
 605         goto out;
 606
 607 reload:
 608         set_config_state(if_old, IFC_RELOAD);
 609 out:
 610         free(old_config);
 611         free(if_new);
 612 }
 613
 614 static void
 615 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 616                  struct vlist_node *node_old)
 617 {
 618         struct interface *if_old = container_of(node_old, struct interface, node);
 619         struct interface *if_new = container_of(node_new, struct interface, node);
 620
 621         if (node_old && node_new) {
 622                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 623                 interface_change_config(if_old, if_new);
 624         } else if (node_old) {
 625                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 626                 set_config_state(if_old, IFC_REMOVE);
 627         } else if (node_new) {
 628                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 629                 proto_init_interface(if_new, if_new->config);
 630                 interface_claim_device(if_new);
 631                 netifd_ubus_add_interface(if_new);
 632         }
 633 }
 634
 635
 636 static void __init
 637 interface_init_list(void)
 638 {
 639         vlist_init(&interfaces, avl_strcmp, interface_update);
 640         interfaces.keep_old = true;
 641         interfaces.no_delete = true;
 642 }