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
  13 struct vlist_tree interfaces;
  14
  15 enum {
  16         IFACE_ATTR_IFNAME,
  17         IFACE_ATTR_PROTO,
  18         IFACE_ATTR_AUTO,
  19         IFACE_ATTR_MAX
  20 };
  21
  22 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  23         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  24         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  25         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  26 };
  27
  28 const struct config_param_list interface_attr_list = {
  29         .n_params = IFACE_ATTR_MAX,
  30         .params = iface_attrs,
  31 };
  32
  33 static void
  34 interface_clear_errors(struct interface *iface)
  35 {
  36         struct interface_error *error, *tmp;
  37
  38         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  39                 list_del(&error->list);
  40                 free(error);
  41         }
  42 }
  43
  44 void interface_add_error(struct interface *iface, const char *subsystem,
  45                          const char *code, const char **data, int n_data)
  46 {
  47         struct interface_error *error;
  48         int i, len = 0;
  49         int *datalen = NULL;
  50         char *dest;
  51
  52         if (n_data) {
  53                 len = n_data * sizeof(char *);
  54                 datalen = alloca(len);
  55                 for (i = 0; i < n_data; i++) {
  56                         datalen[i] = strlen(data[i]) + 1;
  57                         len += datalen[i];
  58                 }
  59         }
  60
  61         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  62         if (!error)
  63                 return;
  64
  65         list_add_tail(&error->list, &iface->errors);
  66         error->subsystem = subsystem;
  67         error->code = code;
  68
  69         dest = (char *) &error->data[n_data + 1];
  70         for (i = 0; i < n_data; i++) {
  71                 error->data[i] = dest;
  72                 memcpy(dest, data[i], datalen[i]);
  73                 dest += datalen[i];
  74         }
  75         error->data[n_data] = NULL;
  76 }
  77
  78 static void
  79 interface_event(struct interface *iface, enum interface_event ev)
  80 {
  81         /* TODO */
  82 }
  83
  84 static void
  85 mark_interface_down(struct interface *iface)
  86 {
  87         vlist_flush_all(&iface->proto_addr);
  88         vlist_flush_all(&iface->proto_route);
  89         if (iface->main_dev.dev)
  90                 device_release(&iface->main_dev);
  91         iface->state = IFS_DOWN;
  92 }
  93
  94 static int
  95 __interface_set_up(struct interface *iface)
  96 {
  97         int ret;
  98
  99         if (iface->state != IFS_DOWN)
 100                 return 0;
 101
 102         if (iface->main_dev.dev) {
 103                 ret = device_claim(&iface->main_dev);
 104                 if (ret)
 105                         return ret;
 106         }
 107
 108         iface->state = IFS_SETUP;
 109         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 110         if (ret) {
 111                 mark_interface_down(iface);
 112                 return ret;
 113         }
 114
 115         return 0;
 116
 117 }
 118
 119 static void
 120 __interface_set_down(struct interface *iface, bool force)
 121 {
 122         interface_clear_errors(iface);
 123
 124         if (iface->state == IFS_DOWN ||
 125                 iface->state == IFS_TEARDOWN)
 126                 return;
 127
 128         iface->state = IFS_TEARDOWN;
 129         interface_event(iface, IFEV_DOWN);
 130         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 131 }
 132
 133 static void
 134 interface_cb(struct device_user *dep, enum device_event ev)
 135 {
 136         struct interface *iface;
 137         bool new_state;
 138
 139         iface = container_of(dep, struct interface, main_dev);
 140         switch (ev) {
 141         case DEV_EVENT_ADD:
 142                 new_state = true;
 143                 break;
 144         case DEV_EVENT_REMOVE:
 145                 new_state = false;
 146                 break;
 147         default:
 148                 return;
 149         }
 150
 151         interface_set_available(iface, new_state);
 152 }
 153
 154 void
 155 interface_set_available(struct interface *iface, bool new_state)
 156 {
 157         if (iface->available == new_state)
 158                 return;
 159
 160         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 161         iface->available = new_state;
 162
 163         if (new_state) {
 164                 if (iface->autostart && !config_init)
 165                         interface_set_up(iface);
 166         } else
 167                 __interface_set_down(iface, true);
 168 }
 169
 170 static void
 171 interface_claim_device(struct interface *iface)
 172 {
 173         struct device *dev;
 174
 175         if (iface->proto_handler &&
 176                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 177                 dev = device_get(iface->ifname, true);
 178                 if (dev)
 179                         device_add_user(&iface->main_dev, dev);
 180         }
 181 }
 182
 183
 184 static void
 185 interface_cleanup(struct interface *iface)
 186 {
 187         if (iface->main_dev.dev)
 188                 device_remove_user(&iface->main_dev);
 189         interface_set_proto_state(iface, NULL);
 190 }
 191
 192 static void
 193 interface_do_free(struct interface *iface)
 194 {
 195         interface_cleanup(iface);
 196         free(iface->config);
 197         netifd_ubus_remove_interface(iface);
 198         free(iface);
 199 }
 200
 201 static void
 202 interface_do_reload(struct interface *iface)
 203 {
 204         interface_cleanup(iface);
 205
 206         interface_claim_device(iface);
 207         proto_init_interface(iface, iface->config);
 208
 209         if (iface->autostart)
 210                 interface_set_up(iface);
 211 }
 212
 213 static void
 214 interface_handle_config_change(struct interface *iface)
 215 {
 216         switch(iface->config_state) {
 217         case IFC_NORMAL:
 218                 break;
 219         case IFC_RELOAD:
 220                 interface_do_reload(iface);
 221                 break;
 222         case IFC_REMOVE:
 223                 interface_do_free(iface);
 224                 break;
 225         }
 226 }
 227
 228 static void
 229 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 230 {
 231         struct interface *iface = state->iface;
 232
 233         switch (ev) {
 234         case IFPEV_UP:
 235                 if (iface->state != IFS_SETUP)
 236                         return;
 237
 238                 iface->state = IFS_UP;
 239                 interface_event(iface, IFEV_UP);
 240                 break;
 241         case IFPEV_DOWN:
 242                 if (iface->state == IFS_DOWN)
 243                         return;
 244
 245                 mark_interface_down(iface);
 246                 interface_handle_config_change(iface);
 247                 break;
 248         case IFPEV_LINK_LOST:
 249                 if (iface->state != IFS_UP)
 250                         return;
 251
 252                 iface->state = IFS_SETUP;
 253                 interface_event(iface, IFEV_DOWN);
 254                 break;
 255         }
 256 }
 257
 258 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 259 {
 260         if (iface->proto) {
 261                 iface->proto->free(iface->proto);
 262                 iface->proto = NULL;
 263         }
 264         iface->state = IFS_DOWN;
 265         iface->proto = state;
 266         if (!state)
 267                 return;
 268
 269         state->proto_event = interface_proto_cb;
 270         state->iface = iface;
 271 }
 272
 273 void
 274 interface_init(struct interface *iface, const char *name,
 275                struct blob_attr *config)
 276 {
 277         struct blob_attr *tb[IFACE_ATTR_MAX];
 278         struct blob_attr *cur;
 279         const char *proto_name = NULL;
 280
 281         strncpy(iface->name, name, sizeof(iface->name) - 1);
 282         INIT_LIST_HEAD(&iface->errors);
 283
 284         iface->main_dev.cb = interface_cb;
 285         iface->l3_dev = &iface->main_dev;
 286
 287         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 288                       blob_data(config), blob_len(config));
 289
 290         if ((cur = tb[IFACE_ATTR_PROTO]))
 291                 proto_name = blobmsg_data(cur);
 292
 293         proto_attach_interface(iface, proto_name);
 294
 295         if ((cur = tb[IFACE_ATTR_AUTO]))
 296                 iface->autostart = blobmsg_get_bool(cur);
 297         else
 298                 iface->autostart = true;
 299         iface->config_autostart = iface->autostart;
 300 }
 301
 302 void
 303 interface_add(struct interface *iface, struct blob_attr *config)
 304 {
 305         struct blob_attr *tb[IFACE_ATTR_MAX];
 306         struct blob_attr *cur;
 307
 308         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 309                       blob_data(config), blob_len(config));
 310
 311         if ((cur = tb[IFACE_ATTR_IFNAME]))
 312                 iface->ifname = blobmsg_data(cur);
 313
 314         iface->config = config;
 315         vlist_add(&interfaces, &iface->node);
 316 }
 317
 318 void
 319 interface_remove_link(struct interface *iface, struct device *dev)
 320 {
 321         struct device *mdev = iface->main_dev.dev;
 322
 323         if (mdev && mdev->hotplug_ops) {
 324                 mdev->hotplug_ops->del(mdev, dev);
 325                 return;
 326         }
 327
 328         device_remove_user(&iface->main_dev);
 329 }
 330
 331 int
 332 interface_add_link(struct interface *iface, struct device *dev)
 333 {
 334         struct device *mdev = iface->main_dev.dev;
 335
 336         if (mdev && mdev->hotplug_ops)
 337                 return mdev->hotplug_ops->add(mdev, dev);
 338
 339         if (iface->main_dev.dev)
 340                 interface_remove_link(iface, NULL);
 341
 342         device_add_user(&iface->main_dev, dev);
 343
 344         return 0;
 345 }
 346
 347 int
 348 interface_set_up(struct interface *iface)
 349 {
 350         iface->autostart = true;
 351
 352         if (!iface->available) {
 353                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 354                 return -1;
 355         }
 356
 357         if (iface->state != IFS_DOWN)
 358                 return 0;
 359
 360         return __interface_set_up(iface);
 361 }
 362
 363 int
 364 interface_set_down(struct interface *iface)
 365 {
 366         if (!iface) {
 367                 vlist_for_each_element(&interfaces, iface, node)
 368                         __interface_set_down(iface, false);
 369         } else {
 370                 iface->autostart = false;
 371                 __interface_set_down(iface, false);
 372         }
 373
 374         return 0;
 375 }
 376
 377 void
 378 interface_start_pending(void)
 379 {
 380         struct interface *iface;
 381
 382         vlist_for_each_element(&interfaces, iface, node) {
 383                 if (iface->available && iface->autostart)
 384                         interface_set_up(iface);
 385         }
 386 }
 387
 388 static void
 389 set_config_state(struct interface *iface, enum interface_config_state s)
 390 {
 391         iface->config_state = s;
 392         if (iface->state == IFS_DOWN)
 393                 interface_handle_config_change(iface);
 394         else
 395                 __interface_set_down(iface, false);
 396 }
 397
 398 static void
 399 interface_change_config(struct interface *if_old, struct interface *if_new)
 400 {
 401         struct blob_attr *old_config = if_old->config;
 402
 403         if_old->config = if_new->config;
 404         if (!if_old->config_autostart && if_new->config_autostart)
 405                 if_old->autostart = true;
 406
 407         if_old->config_autostart = if_new->config_autostart;
 408         if_old->ifname = if_new->ifname;
 409
 410         set_config_state(if_old, IFC_RELOAD);
 411         free(old_config);
 412         free(if_new);
 413 }
 414
 415 static void
 416 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 417                  struct vlist_node *node_old)
 418 {
 419         struct interface *if_old = container_of(node_old, struct interface, node);
 420         struct interface *if_new = container_of(node_new, struct interface, node);
 421
 422         if (node_old && node_new) {
 423                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 424                 interface_change_config(if_old, if_new);
 425         } else if (node_old) {
 426                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 427                 set_config_state(if_old, IFC_REMOVE);
 428         } else if (node_new) {
 429                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 430                 interface_claim_device(if_new);
 431                 proto_init_interface(if_new, if_new->config);
 432                 interface_ip_init(if_new);
 433                 netifd_ubus_add_interface(if_new);
 434         }
 435 }
 436
 437
 438 static void __init
 439 interface_init_list(void)
 440 {
 441         vlist_init(&interfaces, avl_strcmp, interface_update,
 442                    struct interface, node, name);
 443         interfaces.keep_old = true;
 444         interfaces.no_delete = true;
 445 }