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_clear_dns(iface);
  94         vlist_flush_all(&iface->proto_addr);
  95         vlist_flush_all(&iface->proto_route);
  96         if (iface->main_dev.dev)
  97                 device_release(&iface->main_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_clear_dns(iface);
 223         interface_clear_errors(iface);
 224         if (iface->main_dev.dev)
 225                 device_remove_user(&iface->main_dev);
 226         iface->l3_dev = &iface->main_dev;
 227         interface_set_proto_state(iface, NULL);
 228 }
 229
 230 static void
 231 interface_do_free(struct interface *iface)
 232 {
 233         interface_cleanup(iface);
 234         free(iface->config);
 235         netifd_ubus_remove_interface(iface);
 236         avl_delete(&interfaces.avl, &iface->node.avl);
 237         free(iface);
 238 }
 239
 240 static void
 241 interface_do_reload(struct interface *iface)
 242 {
 243         interface_cleanup(iface);
 244
 245         interface_claim_device(iface);
 246         proto_init_interface(iface, iface->config);
 247
 248         if (iface->autostart && !config_init)
 249                 interface_set_up(iface);
 250 }
 251
 252 static void
 253 interface_handle_config_change(struct interface *iface)
 254 {
 255         switch(iface->config_state) {
 256         case IFC_NORMAL:
 257                 break;
 258         case IFC_RELOAD:
 259                 interface_do_reload(iface);
 260                 break;
 261         case IFC_REMOVE:
 262                 interface_do_free(iface);
 263                 break;
 264         }
 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                 system_flush_routes();
 278                 iface->state = IFS_UP;
 279                 iface->start_time = system_get_rtime();
 280                 interface_event(iface, IFEV_UP);
 281                 interface_write_resolv_conf();
 282                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 283                 break;
 284         case IFPEV_DOWN:
 285                 if (iface->state == IFS_DOWN)
 286                         return;
 287
 288                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 289                 system_flush_routes();
 290                 mark_interface_down(iface);
 291                 interface_handle_config_change(iface);
 292                 if (iface->l3_dev->dev)
 293                         device_release(iface->l3_dev);
 294                 if (iface->autostart && iface->available)
 295                         __interface_set_up(iface);
 296                 break;
 297         case IFPEV_LINK_LOST:
 298                 if (iface->state != IFS_UP)
 299                         return;
 300
 301                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 302                 iface->state = IFS_SETUP;
 303                 interface_event(iface, IFEV_DOWN);
 304                 break;
 305         }
 306 }
 307
 308 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 309 {
 310         if (iface->proto) {
 311                 iface->proto->free(iface->proto);
 312                 iface->proto = NULL;
 313         }
 314         iface->state = IFS_DOWN;
 315         iface->proto = state;
 316         if (!state)
 317                 return;
 318
 319         state->proto_event = interface_proto_cb;
 320         state->iface = iface;
 321 }
 322
 323 void
 324 interface_init(struct interface *iface, const char *name,
 325                struct blob_attr *config)
 326 {
 327         struct blob_attr *tb[IFACE_ATTR_MAX];
 328         struct blob_attr *cur;
 329         const char *proto_name = NULL;
 330
 331         strncpy(iface->name, name, sizeof(iface->name) - 1);
 332         INIT_LIST_HEAD(&iface->errors);
 333         INIT_LIST_HEAD(&iface->users);
 334         INIT_LIST_HEAD(&iface->hotplug_list);
 335         INIT_LIST_HEAD(&iface->proto_dns_search);
 336         INIT_LIST_HEAD(&iface->proto_dns_servers);
 337
 338         iface->main_dev.cb = interface_cb;
 339         iface->l3_dev = &iface->main_dev;
 340
 341         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 342                       blob_data(config), blob_len(config));
 343
 344         if ((cur = tb[IFACE_ATTR_PROTO]))
 345                 proto_name = blobmsg_data(cur);
 346
 347         proto_attach_interface(iface, proto_name);
 348
 349         if ((cur = tb[IFACE_ATTR_AUTO]))
 350                 iface->autostart = blobmsg_get_bool(cur);
 351         else
 352                 iface->autostart = true;
 353         iface->config_autostart = iface->autostart;
 354 }
 355
 356 void
 357 interface_add(struct interface *iface, struct blob_attr *config)
 358 {
 359         struct blob_attr *tb[IFACE_ATTR_MAX];
 360         struct blob_attr *cur;
 361
 362         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 363                       blob_data(config), blob_len(config));
 364
 365         if ((cur = tb[IFACE_ATTR_IFNAME]))
 366                 iface->ifname = blobmsg_data(cur);
 367
 368         iface->config = config;
 369         vlist_add(&interfaces, &iface->node);
 370 }
 371
 372 void
 373 interface_remove_link(struct interface *iface, struct device *dev)
 374 {
 375         struct device *mdev = iface->main_dev.dev;
 376
 377         if (mdev && mdev->hotplug_ops) {
 378                 mdev->hotplug_ops->del(mdev, dev);
 379                 return;
 380         }
 381
 382         device_remove_user(&iface->main_dev);
 383 }
 384
 385 int
 386 interface_add_link(struct interface *iface, struct device *dev)
 387 {
 388         struct device *mdev = iface->main_dev.dev;
 389
 390         if (mdev && mdev->hotplug_ops)
 391                 return mdev->hotplug_ops->add(mdev, dev);
 392
 393         if (iface->main_dev.dev)
 394                 interface_remove_link(iface, NULL);
 395
 396         device_add_user(&iface->main_dev, dev);
 397
 398         return 0;
 399 }
 400
 401 int
 402 interface_set_up(struct interface *iface)
 403 {
 404         iface->autostart = true;
 405
 406         if (iface->state != IFS_DOWN)
 407                 return 0;
 408
 409         interface_clear_errors(iface);
 410         if (!iface->available) {
 411                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 412                 return -1;
 413         }
 414
 415         return __interface_set_up(iface);
 416 }
 417
 418 int
 419 interface_set_down(struct interface *iface)
 420 {
 421         if (!iface) {
 422                 vlist_for_each_element(&interfaces, iface, node)
 423                         __interface_set_down(iface, false);
 424         } else {
 425                 iface->autostart = false;
 426                 __interface_set_down(iface, false);
 427         }
 428
 429         return 0;
 430 }
 431
 432 void
 433 interface_start_pending(void)
 434 {
 435         struct interface *iface;
 436
 437         vlist_for_each_element(&interfaces, iface, node) {
 438                 if (iface->available && iface->autostart)
 439                         interface_set_up(iface);
 440         }
 441 }
 442
 443 static void
 444 set_config_state(struct interface *iface, enum interface_config_state s)
 445 {
 446         iface->config_state = s;
 447         if (iface->state == IFS_DOWN)
 448                 interface_handle_config_change(iface);
 449         else
 450                 __interface_set_down(iface, false);
 451 }
 452
 453 static void
 454 interface_change_config(struct interface *if_old, struct interface *if_new)
 455 {
 456         struct blob_attr *old_config = if_old->config;
 457         const char *old_ifname = if_old->ifname;
 458         const struct proto_handler *proto = if_old->proto_handler;
 459
 460         interface_clear_errors(if_old);
 461         if_old->config = if_new->config;
 462         if (!if_old->config_autostart && if_new->config_autostart)
 463                 if_old->autostart = true;
 464
 465         if_old->config_autostart = if_new->config_autostart;
 466         if_old->ifname = if_new->ifname;
 467         if_old->proto_handler = if_new->proto_handler;
 468
 469         if (strcmp(old_ifname, if_new->ifname) != 0 ||
 470                 proto != if_new->proto_handler) {
 471                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 472                   if_old->name);
 473                 goto reload;
 474         }
 475
 476         if (!proto->config_params)
 477                 D(INTERFACE, "No config parameters for interface '%s'\n",
 478                   if_old->name);
 479         else if (!config_check_equal(old_config, if_new->config,
 480                                 proto->config_params)) {
 481                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 482                   if_old->name);
 483                 goto reload;
 484         }
 485
 486         goto out;
 487
 488 reload:
 489         set_config_state(if_old, IFC_RELOAD);
 490 out:
 491         free(old_config);
 492         free(if_new);
 493 }
 494
 495 static void
 496 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 497                  struct vlist_node *node_old)
 498 {
 499         struct interface *if_old = container_of(node_old, struct interface, node);
 500         struct interface *if_new = container_of(node_new, struct interface, node);
 501
 502         if (node_old && node_new) {
 503                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 504                 interface_change_config(if_old, if_new);
 505         } else if (node_old) {
 506                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 507                 set_config_state(if_old, IFC_REMOVE);
 508         } else if (node_new) {
 509                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 510                 interface_claim_device(if_new);
 511                 proto_init_interface(if_new, if_new->config);
 512                 interface_ip_init(if_new);
 513                 netifd_ubus_add_interface(if_new);
 514         }
 515 }
 516
 517
 518 static void __init
 519 interface_init_list(void)
 520 {
 521         vlist_init(&interfaces, avl_strcmp, interface_update,
 522                    struct interface, node, name);
 523         interfaces.keep_old = true;
 524         interfaces.no_delete = true;
 525 }