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