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 }
  97
  98 static void
  99 mark_interface_down(struct interface *iface)
 100 {
 101         interface_flush_state(iface);
 102         iface->state = IFS_DOWN;
 103 }
 104
 105 static int
 106 __interface_set_up(struct interface *iface)
 107 {
 108         int ret;
 109
 110         if (iface->state != IFS_DOWN)
 111                 return 0;
 112
 113         if (iface->main_dev.dev) {
 114                 ret = device_claim(&iface->main_dev);
 115                 if (ret)
 116                         return ret;
 117         }
 118
 119         iface->state = IFS_SETUP;
 120         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 121         if (ret) {
 122                 mark_interface_down(iface);
 123                 return ret;
 124         }
 125
 126         return 0;
 127 }
 128
 129 void
 130 __interface_set_down(struct interface *iface, bool force)
 131 {
 132         interface_clear_errors(iface);
 133
 134         if (iface->state == IFS_DOWN ||
 135                 iface->state == IFS_TEARDOWN)
 136                 return;
 137
 138         iface->state = IFS_TEARDOWN;
 139         interface_event(iface, IFEV_DOWN);
 140         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 141         if (force)
 142                 interface_flush_state(iface);
 143 }
 144
 145 static void
 146 interface_cb(struct device_user *dep, enum device_event ev)
 147 {
 148         struct interface *iface;
 149         bool new_state;
 150
 151         iface = container_of(dep, struct interface, main_dev);
 152         switch (ev) {
 153         case DEV_EVENT_ADD:
 154                 new_state = true;
 155                 break;
 156         case DEV_EVENT_REMOVE:
 157                 new_state = false;
 158                 break;
 159         default:
 160                 return;
 161         }
 162
 163         interface_set_available(iface, new_state);
 164 }
 165
 166 void
 167 interface_set_available(struct interface *iface, bool new_state)
 168 {
 169         if (iface->available == new_state)
 170                 return;
 171
 172         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 173         iface->available = new_state;
 174
 175         if (new_state) {
 176                 if (iface->autostart && !config_init)
 177                         interface_set_up(iface);
 178         } else
 179                 __interface_set_down(iface, true);
 180 }
 181
 182 void
 183 interface_add_user(struct interface_user *dep, struct interface *iface)
 184 {
 185         dep->iface = iface;
 186         list_add(&dep->list, &iface->users);
 187         if (iface->state == IFS_UP)
 188                 dep->cb(dep, IFEV_UP);
 189 }
 190
 191 void
 192 interface_remove_user(struct interface_user *dep)
 193 {
 194         list_del_init(&dep->list);
 195         dep->iface = NULL;
 196 }
 197
 198 static void
 199 interface_claim_device(struct interface *iface)
 200 {
 201         struct device *dev;
 202
 203         if (iface->ifname && iface->proto_handler &&
 204                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 205                 dev = device_get(iface->ifname, true);
 206                 if (dev)
 207                         device_add_user(&iface->main_dev, dev);
 208         }
 209 }
 210
 211
 212 static void
 213 interface_cleanup(struct interface *iface)
 214 {
 215         struct interface_user *dep, *tmp;
 216
 217         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 218                 interface_remove_user(dep);
 219
 220         interface_flush_state(iface);
 221         interface_clear_errors(iface);
 222         if (iface->main_dev.dev)
 223                 device_remove_user(&iface->main_dev);
 224         iface->l3_dev = &iface->main_dev;
 225         interface_set_proto_state(iface, NULL);
 226 }
 227
 228 static void
 229 interface_do_free(struct interface *iface)
 230 {
 231         interface_cleanup(iface);
 232         free(iface->config);
 233         netifd_ubus_remove_interface(iface);
 234         avl_delete(&interfaces.avl, &iface->node.avl);
 235         free(iface);
 236 }
 237
 238 static void
 239 interface_do_reload(struct interface *iface)
 240 {
 241         interface_cleanup(iface);
 242
 243         interface_claim_device(iface);
 244         proto_init_interface(iface, iface->config);
 245
 246         if (iface->autostart && !config_init)
 247                 interface_set_up(iface);
 248 }
 249
 250 static void
 251 interface_handle_config_change(struct interface *iface)
 252 {
 253         switch(iface->config_state) {
 254         case IFC_NORMAL:
 255                 break;
 256         case IFC_RELOAD:
 257                 interface_do_reload(iface);
 258                 break;
 259         case IFC_REMOVE:
 260                 interface_do_free(iface);
 261                 break;
 262         }
 263 }
 264
 265 static void
 266 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 267 {
 268         struct interface *iface = state->iface;
 269
 270         switch (ev) {
 271         case IFPEV_UP:
 272                 if (iface->state != IFS_SETUP)
 273                         return;
 274
 275                 system_flush_routes();
 276                 iface->state = IFS_UP;
 277                 iface->start_time = system_get_rtime();
 278                 interface_event(iface, IFEV_UP);
 279                 interface_write_resolv_conf();
 280                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 281                 break;
 282         case IFPEV_DOWN:
 283                 if (iface->state == IFS_DOWN)
 284                         return;
 285
 286                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 287                 system_flush_routes();
 288                 mark_interface_down(iface);
 289                 interface_handle_config_change(iface);
 290                 if (iface->l3_dev->dev)
 291                         device_release(iface->l3_dev);
 292                 if (iface->autostart && iface->available)
 293                         __interface_set_up(iface);
 294                 break;
 295         case IFPEV_LINK_LOST:
 296                 if (iface->state != IFS_UP)
 297                         return;
 298
 299                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 300                 iface->state = IFS_SETUP;
 301                 interface_event(iface, IFEV_DOWN);
 302                 break;
 303         }
 304 }
 305
 306 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 307 {
 308         if (iface->proto) {
 309                 iface->proto->free(iface->proto);
 310                 iface->proto = NULL;
 311         }
 312         iface->state = IFS_DOWN;
 313         iface->proto = state;
 314         if (!state)
 315                 return;
 316
 317         state->proto_event = interface_proto_cb;
 318         state->iface = iface;
 319 }
 320
 321 void
 322 interface_init(struct interface *iface, const char *name,
 323                struct blob_attr *config)
 324 {
 325         struct blob_attr *tb[IFACE_ATTR_MAX];
 326         struct blob_attr *cur;
 327         const char *proto_name = NULL;
 328
 329         strncpy(iface->name, name, sizeof(iface->name) - 1);
 330         INIT_LIST_HEAD(&iface->errors);
 331         INIT_LIST_HEAD(&iface->users);
 332         INIT_LIST_HEAD(&iface->hotplug_list);
 333         interface_ip_init(&iface->proto_ip, iface);
 334
 335         iface->main_dev.cb = interface_cb;
 336         iface->l3_dev = &iface->main_dev;
 337
 338         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 339                       blob_data(config), blob_len(config));
 340
 341         if ((cur = tb[IFACE_ATTR_PROTO]))
 342                 proto_name = blobmsg_data(cur);
 343
 344         proto_attach_interface(iface, proto_name);
 345
 346         if ((cur = tb[IFACE_ATTR_AUTO]))
 347                 iface->autostart = blobmsg_get_bool(cur);
 348         else
 349                 iface->autostart = true;
 350         iface->config_autostart = iface->autostart;
 351 }
 352
 353 void
 354 interface_add(struct interface *iface, struct blob_attr *config)
 355 {
 356         struct blob_attr *tb[IFACE_ATTR_MAX];
 357         struct blob_attr *cur;
 358
 359         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 360                       blob_data(config), blob_len(config));
 361
 362         if ((cur = tb[IFACE_ATTR_IFNAME]))
 363                 iface->ifname = blobmsg_data(cur);
 364
 365         iface->config = config;
 366         vlist_add(&interfaces, &iface->node);
 367 }
 368
 369 void
 370 interface_remove_link(struct interface *iface, struct device *dev)
 371 {
 372         struct device *mdev = iface->main_dev.dev;
 373
 374         if (mdev && mdev->hotplug_ops) {
 375                 mdev->hotplug_ops->del(mdev, dev);
 376                 return;
 377         }
 378
 379         device_remove_user(&iface->main_dev);
 380 }
 381
 382 int
 383 interface_add_link(struct interface *iface, struct device *dev)
 384 {
 385         struct device *mdev = iface->main_dev.dev;
 386
 387         if (mdev && mdev->hotplug_ops)
 388                 return mdev->hotplug_ops->add(mdev, dev);
 389
 390         if (iface->main_dev.dev)
 391                 interface_remove_link(iface, NULL);
 392
 393         device_add_user(&iface->main_dev, dev);
 394
 395         return 0;
 396 }
 397
 398 int
 399 interface_set_up(struct interface *iface)
 400 {
 401         iface->autostart = true;
 402
 403         if (iface->state != IFS_DOWN)
 404                 return 0;
 405
 406         interface_clear_errors(iface);
 407         if (!iface->available) {
 408                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 409                 return -1;
 410         }
 411
 412         return __interface_set_up(iface);
 413 }
 414
 415 int
 416 interface_set_down(struct interface *iface)
 417 {
 418         if (!iface) {
 419                 vlist_for_each_element(&interfaces, iface, node)
 420                         __interface_set_down(iface, false);
 421         } else {
 422                 iface->autostart = false;
 423                 __interface_set_down(iface, false);
 424         }
 425
 426         return 0;
 427 }
 428
 429 void
 430 interface_start_pending(void)
 431 {
 432         struct interface *iface;
 433
 434         vlist_for_each_element(&interfaces, iface, node) {
 435                 if (iface->available && iface->autostart)
 436                         interface_set_up(iface);
 437         }
 438 }
 439
 440 static void
 441 set_config_state(struct interface *iface, enum interface_config_state s)
 442 {
 443         iface->config_state = s;
 444         if (iface->state == IFS_DOWN)
 445                 interface_handle_config_change(iface);
 446         else
 447                 __interface_set_down(iface, false);
 448 }
 449
 450 static void
 451 interface_change_config(struct interface *if_old, struct interface *if_new)
 452 {
 453         struct blob_attr *old_config = if_old->config;
 454         const char *old_ifname = if_old->ifname;
 455         const struct proto_handler *proto = if_old->proto_handler;
 456
 457         interface_clear_errors(if_old);
 458         if_old->config = if_new->config;
 459         if (!if_old->config_autostart && if_new->config_autostart)
 460                 if_old->autostart = true;
 461
 462         if_old->config_autostart = if_new->config_autostart;
 463         if_old->ifname = if_new->ifname;
 464         if_old->proto_handler = if_new->proto_handler;
 465
 466         if (strcmp(old_ifname, if_new->ifname) != 0 ||
 467                 proto != if_new->proto_handler) {
 468                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 469                   if_old->name);
 470                 goto reload;
 471         }
 472
 473         if (!proto->config_params)
 474                 D(INTERFACE, "No config parameters for interface '%s'\n",
 475                   if_old->name);
 476         else if (!config_check_equal(old_config, if_new->config,
 477                                 proto->config_params)) {
 478                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 479                   if_old->name);
 480                 goto reload;
 481         }
 482
 483         goto out;
 484
 485 reload:
 486         set_config_state(if_old, IFC_RELOAD);
 487 out:
 488         free(old_config);
 489         free(if_new);
 490 }
 491
 492 static void
 493 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 494                  struct vlist_node *node_old)
 495 {
 496         struct interface *if_old = container_of(node_old, struct interface, node);
 497         struct interface *if_new = container_of(node_new, struct interface, node);
 498
 499         if (node_old && node_new) {
 500                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 501                 interface_change_config(if_old, if_new);
 502         } else if (node_old) {
 503                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 504                 set_config_state(if_old, IFC_REMOVE);
 505         } else if (node_new) {
 506                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 507                 interface_claim_device(if_new);
 508                 proto_init_interface(if_new, if_new->config);
 509                 netifd_ubus_add_interface(if_new);
 510         }
 511 }
 512
 513
 514 static void __init
 515 interface_init_list(void)
 516 {
 517         vlist_init(&interfaces, avl_strcmp, interface_update,
 518                    struct interface, node, name);
 519         interfaces.keep_old = true;
 520         interfaces.no_delete = true;
 521 }