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