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_flush_state(iface);
 146         iface->state = IFS_DOWN;
 147 }
 148
 149 void
 150 __interface_set_down(struct interface *iface, bool force)
 151 {
 152         interface_clear_errors(iface);
 153
 154         if (iface->state == IFS_DOWN ||
 155                 iface->state == IFS_TEARDOWN)
 156                 return;
 157
 158         if (iface->state == IFS_UP)
 159                 interface_event(iface, IFEV_DOWN);
 160         iface->state = IFS_TEARDOWN;
 161         interface_ip_flush(&iface->config_ip);
 162         interface_ip_flush(&iface->proto_ip);
 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_ip_flush(&iface->config_ip);
 246         interface_flush_state(iface);
 247         interface_clear_errors(iface);
 248         if (iface->main_dev.dev &&
 249             (!reload || !iface->main_dev.hotplug))
 250                 interface_set_main_dev(iface, NULL);
 251         interface_set_proto_state(iface, NULL);
 252 }
 253
 254 static void
 255 interface_do_free(struct interface *iface)
 256 {
 257         interface_cleanup(iface, false);
 258         free(iface->config);
 259         netifd_ubus_remove_interface(iface);
 260         avl_delete(&interfaces.avl, &iface->node.avl);
 261         free(iface);
 262 }
 263
 264 static void
 265 interface_do_reload(struct interface *iface)
 266 {
 267         interface_cleanup(iface, true);
 268         proto_init_interface(iface, iface->config);
 269         interface_claim_device(iface);
 270 }
 271
 272 static void
 273 interface_handle_config_change(struct interface *iface)
 274 {
 275         switch(iface->config_state) {
 276         case IFC_NORMAL:
 277                 break;
 278         case IFC_RELOAD:
 279                 interface_do_reload(iface);
 280                 break;
 281         case IFC_REMOVE:
 282                 interface_do_free(iface);
 283                 return;
 284         }
 285         if (iface->autostart && iface->available)
 286                 interface_set_up(iface);
 287 }
 288
 289 static void
 290 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 291 {
 292         struct interface *iface = state->iface;
 293
 294         switch (ev) {
 295         case IFPEV_UP:
 296                 if (iface->state != IFS_SETUP)
 297                         return;
 298
 299                 interface_ip_set_enabled(&iface->config_ip, true);
 300                 system_flush_routes();
 301                 iface->state = IFS_UP;
 302                 iface->start_time = system_get_rtime();
 303                 interface_event(iface, IFEV_UP);
 304                 interface_write_resolv_conf();
 305                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 306                 break;
 307         case IFPEV_DOWN:
 308                 if (iface->state == IFS_DOWN)
 309                         return;
 310
 311                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 312                 interface_ip_set_enabled(&iface->config_ip, false);
 313                 system_flush_routes();
 314                 mark_interface_down(iface);
 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                 iface->state = IFS_SETUP;
 325                 break;
 326         }
 327 }
 328
 329 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 330 {
 331         if (iface->proto) {
 332                 iface->proto->free(iface->proto);
 333                 iface->proto = NULL;
 334         }
 335         iface->state = IFS_DOWN;
 336         iface->proto = state;
 337         if (!state)
 338                 return;
 339
 340         state->proto_event = interface_proto_cb;
 341         state->iface = iface;
 342 }
 343
 344 void
 345 interface_init(struct interface *iface, const char *name,
 346                struct blob_attr *config)
 347 {
 348         struct blob_attr *tb[IFACE_ATTR_MAX];
 349         struct blob_attr *cur;
 350         const char *proto_name = NULL;
 351
 352         strncpy(iface->name, name, sizeof(iface->name) - 1);
 353         INIT_LIST_HEAD(&iface->errors);
 354         INIT_LIST_HEAD(&iface->users);
 355         INIT_LIST_HEAD(&iface->hotplug_list);
 356         interface_ip_init(&iface->proto_ip, iface);
 357         interface_ip_init(&iface->config_ip, iface);
 358         avl_init(&iface->data, avl_strcmp, false, NULL);
 359         iface->config_ip.enabled = false;
 360
 361         iface->main_dev.cb = interface_cb;
 362
 363         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 364                       blob_data(config), blob_len(config));
 365
 366         if ((cur = tb[IFACE_ATTR_PROTO]))
 367                 proto_name = blobmsg_data(cur);
 368
 369         proto_attach_interface(iface, proto_name);
 370
 371         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 372         iface->proto_ip.no_defaultroute =
 373                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 374
 375         iface->config_autostart = iface->autostart;
 376 }
 377
 378 void
 379 interface_add(struct interface *iface, struct blob_attr *config)
 380 {
 381         struct blob_attr *tb[IFACE_ATTR_MAX];
 382         struct blob_attr *cur;
 383
 384         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 385                       blob_data(config), blob_len(config));
 386
 387         if ((cur = tb[IFACE_ATTR_IFNAME]))
 388                 iface->ifname = blobmsg_data(cur);
 389
 390         iface->config = config;
 391         vlist_add(&interfaces, &iface->node, iface->name);
 392 }
 393
 394 void
 395 interface_set_l3_dev(struct interface *iface, struct device *dev)
 396 {
 397         bool enabled = iface->config_ip.enabled;
 398         bool claimed = iface->l3_dev.claimed;
 399
 400         if (iface->l3_dev.dev == dev)
 401                 return;
 402
 403         interface_ip_set_enabled(&iface->config_ip, false);
 404         interface_ip_flush(&iface->proto_ip);
 405         device_add_user(&iface->l3_dev, dev);
 406
 407         if (dev) {
 408                 if (claimed)
 409                         device_claim(&iface->l3_dev);
 410                 interface_ip_set_enabled(&iface->config_ip, enabled);
 411         }
 412 }
 413
 414 void
 415 interface_set_main_dev(struct interface *iface, struct device *dev)
 416 {
 417         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 418         bool claimed = iface->l3_dev.claimed;
 419
 420         if (iface->main_dev.dev == dev)
 421                 return;
 422
 423         device_add_user(&iface->main_dev, dev);
 424         if (set_l3)
 425                 interface_set_l3_dev(iface, dev);
 426
 427         if (claimed)
 428                 device_claim(&iface->l3_dev);
 429
 430         if (!iface->l3_dev.dev)
 431                 interface_set_l3_dev(iface, dev);
 432 }
 433
 434 int
 435 interface_remove_link(struct interface *iface, struct device *dev)
 436 {
 437         struct device *mdev = iface->main_dev.dev;
 438
 439         if (mdev && mdev->hotplug_ops)
 440                 return mdev->hotplug_ops->del(mdev, dev);
 441
 442         if (!iface->main_dev.hotplug)
 443                 return UBUS_STATUS_INVALID_ARGUMENT;
 444
 445         if (dev != iface->main_dev.dev)
 446                 return UBUS_STATUS_INVALID_ARGUMENT;
 447
 448         device_remove_user(&iface->main_dev);
 449         return 0;
 450 }
 451
 452 int
 453 interface_add_link(struct interface *iface, struct device *dev)
 454 {
 455         struct device *mdev = iface->main_dev.dev;
 456
 457         if (mdev == dev)
 458                 return 0;
 459
 460         if (iface->main_dev.hotplug)
 461                 device_remove_user(&iface->main_dev);
 462
 463         if (mdev) {
 464                 if (mdev->hotplug_ops)
 465                         return mdev->hotplug_ops->add(mdev, dev);
 466                 else
 467                         return UBUS_STATUS_NOT_SUPPORTED;
 468         }
 469
 470         interface_set_main_dev(iface, dev);
 471         iface->main_dev.hotplug = true;
 472         return 0;
 473 }
 474
 475 int
 476 interface_set_up(struct interface *iface)
 477 {
 478         int ret;
 479
 480         iface->autostart = true;
 481
 482         if (iface->state != IFS_DOWN)
 483                 return 0;
 484
 485         interface_clear_errors(iface);
 486         if (!iface->available) {
 487                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 488                 return -1;
 489         }
 490
 491         if (iface->main_dev.dev) {
 492                 ret = device_claim(&iface->main_dev);
 493                 if (ret)
 494                         return ret;
 495         }
 496
 497         iface->state = IFS_SETUP;
 498         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 499         if (ret) {
 500                 mark_interface_down(iface);
 501                 return ret;
 502         }
 503
 504         return 0;
 505 }
 506
 507 int
 508 interface_set_down(struct interface *iface)
 509 {
 510         if (!iface) {
 511                 vlist_for_each_element(&interfaces, iface, node)
 512                         __interface_set_down(iface, false);
 513         } else {
 514                 iface->autostart = false;
 515                 __interface_set_down(iface, false);
 516         }
 517
 518         return 0;
 519 }
 520
 521 void
 522 interface_start_pending(void)
 523 {
 524         struct interface *iface;
 525
 526         vlist_for_each_element(&interfaces, iface, node) {
 527                 if (iface->available && iface->autostart)
 528                         interface_set_up(iface);
 529         }
 530 }
 531
 532 static void
 533 set_config_state(struct interface *iface, enum interface_config_state s)
 534 {
 535         iface->config_state = s;
 536         if (iface->state == IFS_DOWN)
 537                 interface_handle_config_change(iface);
 538         else
 539                 __interface_set_down(iface, false);
 540 }
 541
 542 void
 543 interface_update_start(struct interface *iface)
 544 {
 545         interface_ip_update_start(&iface->proto_ip);
 546 }
 547
 548 void
 549 interface_update_complete(struct interface *iface)
 550 {
 551         struct device_route *route;
 552
 553         interface_ip_update_complete(&iface->proto_ip);
 554         vlist_for_each_element(&iface->config_ip.route, route, node) {
 555                 if (iface->l3_dev.dev) {
 556                         system_add_route(iface->l3_dev.dev, route);
 557                         route->enabled = true;
 558                 }
 559         }
 560 }
 561
 562 static void
 563 interface_change_config(struct interface *if_old, struct interface *if_new)
 564 {
 565         struct blob_attr *old_config = if_old->config;
 566         const char *old_ifname = if_old->ifname;
 567         const struct proto_handler *proto = if_old->proto_handler;
 568
 569         interface_clear_errors(if_old);
 570         if_old->config = if_new->config;
 571         if (!if_old->config_autostart && if_new->config_autostart)
 572                 if_old->autostart = true;
 573
 574         if_old->config_autostart = if_new->config_autostart;
 575         if_old->ifname = if_new->ifname;
 576         if_old->proto_handler = if_new->proto_handler;
 577
 578         if ((!!old_ifname != !!if_new->ifname) ||
 579             (old_ifname && strcmp(old_ifname, if_new->ifname) != 0) ||
 580             proto != if_new->proto_handler) {
 581                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 582                   if_old->name);
 583                 goto reload;
 584         }
 585
 586         if (!proto->config_params)
 587                 D(INTERFACE, "No config parameters for interface '%s'\n",
 588                   if_old->name);
 589         else if (!config_check_equal(old_config, if_new->config,
 590                                 proto->config_params)) {
 591                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 592                   if_old->name);
 593                 goto reload;
 594         }
 595
 596 #define UPDATE(field) ({                                                \
 597                 bool __changed = (if_old->field != if_new->field);      \
 598                 if_old->field = if_new->field;                          \
 599                 __changed;                                              \
 600         })
 601
 602         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 603                 interface_ip_set_enabled(&if_old->config_ip, false);
 604                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 605                 interface_ip_set_enabled(&if_old->proto_ip, false);
 606                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 607         }
 608
 609 #undef UPDATE
 610
 611         goto out;
 612
 613 reload:
 614         set_config_state(if_old, IFC_RELOAD);
 615 out:
 616         free(old_config);
 617         free(if_new);
 618 }
 619
 620 static void
 621 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 622                  struct vlist_node *node_old)
 623 {
 624         struct interface *if_old = container_of(node_old, struct interface, node);
 625         struct interface *if_new = container_of(node_new, struct interface, node);
 626
 627         if (node_old && node_new) {
 628                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 629                 interface_change_config(if_old, if_new);
 630         } else if (node_old) {
 631                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 632                 set_config_state(if_old, IFC_REMOVE);
 633         } else if (node_new) {
 634                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 635                 proto_init_interface(if_new, if_new->config);
 636                 interface_claim_device(if_new);
 637                 netifd_ubus_add_interface(if_new);
 638         }
 639 }
 640
 641
 642 static void __init
 643 interface_init_list(void)
 644 {
 645         vlist_init(&interfaces, avl_strcmp, interface_update);
 646         interfaces.keep_old = true;
 647         interfaces.no_delete = true;
 648 }