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