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         interface_queue_event(iface, ev);
  83 }
  84
  85 static void
  86 mark_interface_down(struct interface *iface)
  87 {
  88         interface_clear_dns(iface);
  89         vlist_flush_all(&iface->proto_addr);
  90         vlist_flush_all(&iface->proto_route);
  91         if (iface->main_dev.dev)
  92                 device_release(&iface->main_dev);
  93         iface->state = IFS_DOWN;
  94 }
  95
  96 static int
  97 __interface_set_up(struct interface *iface)
  98 {
  99         int ret;
 100
 101         if (iface->state != IFS_DOWN)
 102                 return 0;
 103
 104         if (iface->main_dev.dev) {
 105                 ret = device_claim(&iface->main_dev);
 106                 if (ret)
 107                         return ret;
 108         }
 109
 110         iface->state = IFS_SETUP;
 111         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 112         if (ret) {
 113                 mark_interface_down(iface);
 114                 return ret;
 115         }
 116
 117         return 0;
 118
 119 }
 120
 121 static void
 122 __interface_set_down(struct interface *iface, bool force)
 123 {
 124         interface_clear_errors(iface);
 125
 126         if (iface->state == IFS_DOWN ||
 127                 iface->state == IFS_TEARDOWN)
 128                 return;
 129
 130         iface->state = IFS_TEARDOWN;
 131         interface_event(iface, IFEV_DOWN);
 132         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 133 }
 134
 135 static void
 136 interface_cb(struct device_user *dep, enum device_event ev)
 137 {
 138         struct interface *iface;
 139         bool new_state;
 140
 141         iface = container_of(dep, struct interface, main_dev);
 142         switch (ev) {
 143         case DEV_EVENT_ADD:
 144                 new_state = true;
 145                 break;
 146         case DEV_EVENT_REMOVE:
 147                 new_state = false;
 148                 break;
 149         default:
 150                 return;
 151         }
 152
 153         interface_set_available(iface, new_state);
 154 }
 155
 156 void
 157 interface_set_available(struct interface *iface, bool new_state)
 158 {
 159         if (iface->available == new_state)
 160                 return;
 161
 162         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 163         iface->available = new_state;
 164
 165         if (new_state) {
 166                 if (iface->autostart && !config_init)
 167                         interface_set_up(iface);
 168         } else
 169                 __interface_set_down(iface, true);
 170 }
 171
 172 static void
 173 interface_claim_device(struct interface *iface)
 174 {
 175         struct device *dev;
 176
 177         if (iface->proto_handler &&
 178                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 179                 dev = device_get(iface->ifname, true);
 180                 if (dev)
 181                         device_add_user(&iface->main_dev, dev);
 182         }
 183 }
 184
 185
 186 static void
 187 interface_cleanup(struct interface *iface)
 188 {
 189         interface_clear_dns(iface);
 190         interface_clear_errors(iface);
 191         if (iface->main_dev.dev)
 192                 device_remove_user(&iface->main_dev);
 193         interface_set_proto_state(iface, NULL);
 194 }
 195
 196 static void
 197 interface_do_free(struct interface *iface)
 198 {
 199         interface_cleanup(iface);
 200         free(iface->config);
 201         netifd_ubus_remove_interface(iface);
 202         avl_delete(&interfaces.avl, &iface->node.avl);
 203         free(iface);
 204 }
 205
 206 static void
 207 interface_do_reload(struct interface *iface)
 208 {
 209         interface_cleanup(iface);
 210
 211         interface_claim_device(iface);
 212         proto_init_interface(iface, iface->config);
 213
 214         if (iface->autostart && !config_init)
 215                 interface_set_up(iface);
 216 }
 217
 218 static void
 219 interface_handle_config_change(struct interface *iface)
 220 {
 221         switch(iface->config_state) {
 222         case IFC_NORMAL:
 223                 break;
 224         case IFC_RELOAD:
 225                 interface_do_reload(iface);
 226                 break;
 227         case IFC_REMOVE:
 228                 interface_do_free(iface);
 229                 break;
 230         }
 231 }
 232
 233 static void
 234 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 235 {
 236         struct interface *iface = state->iface;
 237
 238         switch (ev) {
 239         case IFPEV_UP:
 240                 if (iface->state != IFS_SETUP)
 241                         return;
 242
 243                 iface->state = IFS_UP;
 244                 iface->start_time = system_get_rtime();
 245                 interface_event(iface, IFEV_UP);
 246                 interface_write_resolv_conf();
 247                 break;
 248         case IFPEV_DOWN:
 249                 if (iface->state == IFS_DOWN)
 250                         return;
 251
 252                 mark_interface_down(iface);
 253                 interface_handle_config_change(iface);
 254                 if (iface->autostart)
 255                         __interface_set_up(iface);
 256                 break;
 257         case IFPEV_LINK_LOST:
 258                 if (iface->state != IFS_UP)
 259                         return;
 260
 261                 iface->state = IFS_SETUP;
 262                 interface_event(iface, IFEV_DOWN);
 263                 break;
 264         }
 265 }
 266
 267 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 268 {
 269         if (iface->proto) {
 270                 iface->proto->free(iface->proto);
 271                 iface->proto = NULL;
 272         }
 273         iface->state = IFS_DOWN;
 274         iface->proto = state;
 275         if (!state)
 276                 return;
 277
 278         state->proto_event = interface_proto_cb;
 279         state->iface = iface;
 280 }
 281
 282 void
 283 interface_init(struct interface *iface, const char *name,
 284                struct blob_attr *config)
 285 {
 286         struct blob_attr *tb[IFACE_ATTR_MAX];
 287         struct blob_attr *cur;
 288         const char *proto_name = NULL;
 289
 290         strncpy(iface->name, name, sizeof(iface->name) - 1);
 291         INIT_LIST_HEAD(&iface->errors);
 292         INIT_LIST_HEAD(&iface->hotplug_list);
 293         INIT_LIST_HEAD(&iface->proto_dns_search);
 294         INIT_LIST_HEAD(&iface->proto_dns_servers);
 295
 296         iface->main_dev.cb = interface_cb;
 297         iface->l3_dev = &iface->main_dev;
 298
 299         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 300                       blob_data(config), blob_len(config));
 301
 302         if ((cur = tb[IFACE_ATTR_PROTO]))
 303                 proto_name = blobmsg_data(cur);
 304
 305         proto_attach_interface(iface, proto_name);
 306
 307         if ((cur = tb[IFACE_ATTR_AUTO]))
 308                 iface->autostart = blobmsg_get_bool(cur);
 309         else
 310                 iface->autostart = true;
 311         iface->config_autostart = iface->autostart;
 312 }
 313
 314 void
 315 interface_add(struct interface *iface, struct blob_attr *config)
 316 {
 317         struct blob_attr *tb[IFACE_ATTR_MAX];
 318         struct blob_attr *cur;
 319
 320         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 321                       blob_data(config), blob_len(config));
 322
 323         if ((cur = tb[IFACE_ATTR_IFNAME]))
 324                 iface->ifname = blobmsg_data(cur);
 325
 326         iface->config = config;
 327         vlist_add(&interfaces, &iface->node);
 328 }
 329
 330 void
 331 interface_remove_link(struct interface *iface, struct device *dev)
 332 {
 333         struct device *mdev = iface->main_dev.dev;
 334
 335         if (mdev && mdev->hotplug_ops) {
 336                 mdev->hotplug_ops->del(mdev, dev);
 337                 return;
 338         }
 339
 340         device_remove_user(&iface->main_dev);
 341 }
 342
 343 int
 344 interface_add_link(struct interface *iface, struct device *dev)
 345 {
 346         struct device *mdev = iface->main_dev.dev;
 347
 348         if (mdev && mdev->hotplug_ops)
 349                 return mdev->hotplug_ops->add(mdev, dev);
 350
 351         if (iface->main_dev.dev)
 352                 interface_remove_link(iface, NULL);
 353
 354         device_add_user(&iface->main_dev, dev);
 355
 356         return 0;
 357 }
 358
 359 int
 360 interface_set_up(struct interface *iface)
 361 {
 362         iface->autostart = true;
 363
 364         if (!iface->available) {
 365                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 366                 return -1;
 367         }
 368
 369         if (iface->state != IFS_DOWN)
 370                 return 0;
 371
 372         return __interface_set_up(iface);
 373 }
 374
 375 int
 376 interface_set_down(struct interface *iface)
 377 {
 378         if (!iface) {
 379                 vlist_for_each_element(&interfaces, iface, node)
 380                         __interface_set_down(iface, false);
 381         } else {
 382                 iface->autostart = false;
 383                 __interface_set_down(iface, false);
 384         }
 385
 386         return 0;
 387 }
 388
 389 void
 390 interface_start_pending(void)
 391 {
 392         struct interface *iface;
 393
 394         vlist_for_each_element(&interfaces, iface, node) {
 395                 if (iface->available && iface->autostart)
 396                         interface_set_up(iface);
 397         }
 398 }
 399
 400 static void
 401 set_config_state(struct interface *iface, enum interface_config_state s)
 402 {
 403         iface->config_state = s;
 404         if (iface->state == IFS_DOWN)
 405                 interface_handle_config_change(iface);
 406         else
 407                 __interface_set_down(iface, false);
 408 }
 409
 410 static void
 411 interface_change_config(struct interface *if_old, struct interface *if_new)
 412 {
 413         struct blob_attr *old_config = if_old->config;
 414         const char *old_ifname = if_old->ifname;
 415         const struct proto_handler *proto = if_old->proto_handler;
 416
 417         interface_clear_errors(if_old);
 418         if_old->config = if_new->config;
 419         if (!if_old->config_autostart && if_new->config_autostart)
 420                 if_old->autostart = true;
 421
 422         if_old->config_autostart = if_new->config_autostart;
 423         if_old->ifname = if_new->ifname;
 424         if_old->proto_handler = if_new->proto_handler;
 425
 426         if (strcmp(old_ifname, if_new->ifname) != 0 ||
 427                 proto != if_new->proto_handler) {
 428                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 429                   if_old->name);
 430                 goto reload;
 431         }
 432
 433         if (!proto->config_params)
 434                 D(INTERFACE, "No config parameters for interface '%s'\n",
 435                   if_old->name);
 436         else if (!config_check_equal(old_config, if_new->config,
 437                                 proto->config_params)) {
 438                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 439                   if_old->name);
 440                 goto reload;
 441         }
 442
 443         goto out;
 444
 445 reload:
 446         set_config_state(if_old, IFC_RELOAD);
 447 out:
 448         free(old_config);
 449         free(if_new);
 450 }
 451
 452 static void
 453 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 454                  struct vlist_node *node_old)
 455 {
 456         struct interface *if_old = container_of(node_old, struct interface, node);
 457         struct interface *if_new = container_of(node_new, struct interface, node);
 458
 459         if (node_old && node_new) {
 460                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 461                 interface_change_config(if_old, if_new);
 462         } else if (node_old) {
 463                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 464                 set_config_state(if_old, IFC_REMOVE);
 465         } else if (node_new) {
 466                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 467                 interface_claim_device(if_new);
 468                 proto_init_interface(if_new, if_new->config);
 469                 interface_ip_init(if_new);
 470                 netifd_ubus_add_interface(if_new);
 471         }
 472 }
 473
 474
 475 static void __init
 476 interface_init_list(void)
 477 {
 478         vlist_init(&interfaces, avl_strcmp, interface_update,
 479                    struct interface, node, name);
 480         interfaces.keep_old = true;
 481         interfaces.no_delete = true;
 482 }