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