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