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