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