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 clear_interface_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         clear_interface_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         iface->available = new_state;
 161
 162         if (new_state) {
 163                 if (iface->autostart && !config_init)
 164                         interface_set_up(iface);
 165         } else
 166                 __interface_set_down(iface, true);
 167 }
 168
 169 static void
 170 interface_do_free(struct interface *iface)
 171 {
 172         interface_set_proto_state(iface, NULL);
 173         free(iface->config);
 174         netifd_ubus_remove_interface(iface);
 175         free(iface);
 176 }
 177
 178 static void
 179 interface_handle_config_change(struct interface *iface)
 180 {
 181         switch(iface->config_state) {
 182         case IFC_NORMAL:
 183                 break;
 184         case IFC_RELOAD:
 185                 if (iface->autostart)
 186                         interface_set_up(iface);
 187                 break;
 188         case IFC_REMOVE:
 189                 interface_do_free(iface);
 190                 break;
 191         }
 192 }
 193
 194 static void
 195 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 196 {
 197         struct interface *iface = state->iface;
 198
 199         switch (ev) {
 200         case IFPEV_UP:
 201                 if (iface->state != IFS_SETUP)
 202                         return;
 203
 204                 iface->state = IFS_UP;
 205                 interface_event(iface, IFEV_UP);
 206                 break;
 207         case IFPEV_DOWN:
 208                 if (iface->state == IFS_DOWN)
 209                         return;
 210
 211                 mark_interface_down(iface);
 212                 interface_handle_config_change(iface);
 213                 break;
 214         case IFPEV_LINK_LOST:
 215                 if (iface->state != IFS_UP)
 216                         return;
 217
 218                 iface->state = IFS_SETUP;
 219                 interface_event(iface, IFEV_DOWN);
 220                 break;
 221         }
 222 }
 223
 224 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 225 {
 226         if (iface->proto) {
 227                 iface->proto->free(iface->proto);
 228                 iface->proto = NULL;
 229         }
 230         iface->state = IFS_DOWN;
 231         iface->proto = state;
 232         if (!state)
 233                 return;
 234
 235         state->proto_event = interface_proto_cb;
 236         state->iface = iface;
 237 }
 238
 239 void
 240 interface_init(struct interface *iface, const char *name,
 241                struct blob_attr *config)
 242 {
 243         struct blob_attr *tb[IFACE_ATTR_MAX];
 244         struct blob_attr *cur;
 245         const char *proto_name = NULL;
 246
 247         strncpy(iface->name, name, sizeof(iface->name) - 1);
 248         INIT_LIST_HEAD(&iface->errors);
 249
 250         iface->main_dev.cb = interface_cb;
 251         iface->l3_dev = &iface->main_dev;
 252
 253         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 254                       blob_data(config), blob_len(config));
 255
 256         if ((cur = tb[IFACE_ATTR_PROTO]))
 257                 proto_name = blobmsg_data(cur);
 258
 259         proto_attach_interface(iface, proto_name);
 260
 261         if ((cur = tb[IFACE_ATTR_AUTO]))
 262                 iface->autostart = blobmsg_get_bool(cur);
 263         else
 264                 iface->autostart = true;
 265         iface->config_autostart = iface->autostart;
 266 }
 267
 268 void
 269 interface_add(struct interface *iface, struct blob_attr *config)
 270 {
 271         struct blob_attr *tb[IFACE_ATTR_MAX];
 272         struct blob_attr *cur;
 273         struct device *dev;
 274
 275         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 276                       blob_data(config), blob_len(config));
 277
 278         if ((cur = tb[IFACE_ATTR_IFNAME])) {
 279                 iface->ifname = blobmsg_data(cur);
 280
 281                 if (iface->proto_handler &&
 282                     !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 283                         dev = device_get(iface->ifname, true);
 284                         if (dev)
 285                                 device_add_user(&iface->main_dev, dev);
 286                 }
 287         }
 288
 289         iface->config = config;
 290         vlist_add(&interfaces, &iface->node);
 291 }
 292
 293 void
 294 interface_remove_link(struct interface *iface, struct device *dev)
 295 {
 296         struct device *mdev = iface->main_dev.dev;
 297
 298         if (mdev && mdev->hotplug_ops) {
 299                 mdev->hotplug_ops->del(mdev, dev);
 300                 return;
 301         }
 302
 303         device_remove_user(&iface->main_dev);
 304 }
 305
 306 int
 307 interface_add_link(struct interface *iface, struct device *dev)
 308 {
 309         struct device *mdev = iface->main_dev.dev;
 310
 311         if (mdev && mdev->hotplug_ops)
 312                 return mdev->hotplug_ops->add(mdev, dev);
 313
 314         if (iface->main_dev.dev)
 315                 interface_remove_link(iface, NULL);
 316
 317         device_add_user(&iface->main_dev, dev);
 318
 319         return 0;
 320 }
 321
 322 int
 323 interface_set_up(struct interface *iface)
 324 {
 325         iface->autostart = true;
 326
 327         if (!iface->available) {
 328                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 329                 return -1;
 330         }
 331
 332         if (iface->state != IFS_DOWN)
 333                 return 0;
 334
 335         return __interface_set_up(iface);
 336 }
 337
 338 int
 339 interface_set_down(struct interface *iface)
 340 {
 341         if (!iface) {
 342                 vlist_for_each_element(&interfaces, iface, node)
 343                         __interface_set_down(iface, false);
 344         } else {
 345                 iface->autostart = false;
 346                 __interface_set_down(iface, false);
 347         }
 348
 349         return 0;
 350 }
 351
 352 void
 353 interface_start_pending(void)
 354 {
 355         struct interface *iface;
 356
 357         vlist_for_each_element(&interfaces, iface, node) {
 358                 if (iface->available && iface->autostart)
 359                         interface_set_up(iface);
 360         }
 361 }
 362
 363 static void
 364 set_config_state(struct interface *iface, enum interface_config_state s)
 365 {
 366         iface->config_state = s;
 367         if (iface->state == IFS_DOWN)
 368                 interface_handle_config_change(iface);
 369         else
 370                 interface_set_down(iface);
 371 }
 372
 373 static void
 374 interface_change_config(struct interface *if_old, struct interface *if_new)
 375 {
 376         struct blob_attr *old_config = if_old->config;
 377
 378         if_old->config = if_new->config;
 379         if (!if_old->config_autostart && if_new->config_autostart)
 380                 if_old->autostart = true;
 381
 382         if_old->config_autostart = if_new->config_autostart;
 383         if_old->ifname = if_new->ifname;
 384
 385         set_config_state(if_old, IFC_RELOAD);
 386         free(old_config);
 387         free(if_new);
 388 }
 389
 390 static void
 391 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 392                  struct vlist_node *node_old)
 393 {
 394         struct interface *if_old = container_of(node_old, struct interface, node);
 395         struct interface *if_new = container_of(node_new, struct interface, node);
 396
 397         if (node_old && node_new)
 398                 interface_change_config(if_old, if_new);
 399         else if (node_old)
 400                 set_config_state(if_old, IFC_REMOVE);
 401         else if (node_new) {
 402                 proto_init_interface(if_new, if_new->config);
 403                 interface_ip_init(if_new);
 404                 netifd_ubus_add_interface(if_new);
 405         }
 406 }
 407
 408
 409 static void __init
 410 interface_init_list(void)
 411 {
 412         vlist_init(&interfaces, avl_strcmp, interface_update,
 413                    struct interface, node, name);
 414         interfaces.keep_old = true;
 415         interfaces.no_delete = true;
 416 }