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_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 171 {
 172         struct interface *iface = state->iface;
 173
 174         switch (ev) {
 175         case IFPEV_UP:
 176                 if (iface->state != IFS_SETUP)
 177                         return;
 178
 179                 iface->state = IFS_UP;
 180                 interface_event(iface, IFEV_UP);
 181                 break;
 182         case IFPEV_DOWN:
 183                 if (iface->state == IFS_DOWN)
 184                         return;
 185
 186                 mark_interface_down(iface);
 187                 break;
 188         case IFPEV_LINK_LOST:
 189                 if (iface->state != IFS_UP)
 190                         return;
 191
 192                 iface->state = IFS_SETUP;
 193                 interface_event(iface, IFEV_DOWN);
 194                 break;
 195         }
 196 }
 197
 198 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 199 {
 200         if (iface->proto) {
 201                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
 202                 iface->proto->free(iface->proto);
 203                 iface->proto = NULL;
 204         }
 205         iface->state = IFS_DOWN;
 206         iface->proto = state;
 207         if (!state)
 208                 return;
 209
 210         state->proto_event = interface_proto_cb;
 211         state->iface = iface;
 212 }
 213
 214 void
 215 interface_init(struct interface *iface, const char *name,
 216                struct blob_attr *config)
 217 {
 218         struct blob_attr *tb[IFACE_ATTR_MAX];
 219         struct blob_attr *cur;
 220         struct device *dev;
 221         const char *proto_name = NULL;
 222
 223         strncpy(iface->name, name, sizeof(iface->name) - 1);
 224         INIT_LIST_HEAD(&iface->errors);
 225
 226         iface->main_dev.cb = interface_cb;
 227         iface->l3_dev = &iface->main_dev;
 228
 229         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 230                       blob_data(config), blob_len(config));
 231
 232         if ((cur = tb[IFACE_ATTR_PROTO]))
 233                 proto_name = blobmsg_data(cur);
 234
 235         proto_attach_interface(iface, proto_name);
 236
 237         if (iface->proto_handler &&
 238             !(iface->proto_handler->flags & PROTO_FLAG_NODEV) &&
 239             (cur = tb[IFACE_ATTR_IFNAME])) {
 240                 dev = device_get(blobmsg_data(cur), true);
 241                 if (dev)
 242                         device_add_user(&iface->main_dev, dev);
 243         }
 244
 245         if ((cur = tb[IFACE_ATTR_AUTO]))
 246                 iface->autostart = blobmsg_get_bool(cur);
 247         else
 248                 iface->autostart = true;
 249 }
 250
 251 void
 252 interface_add(struct interface *iface, struct blob_attr *config)
 253 {
 254         iface->config = config;
 255         vlist_add(&interfaces, &iface->node);
 256 }
 257
 258 void
 259 interface_remove_link(struct interface *iface, struct device *dev)
 260 {
 261         struct device *mdev = iface->main_dev.dev;
 262
 263         if (mdev && mdev->hotplug_ops) {
 264                 mdev->hotplug_ops->del(mdev, dev);
 265                 return;
 266         }
 267
 268         device_remove_user(&iface->main_dev);
 269 }
 270
 271 int
 272 interface_add_link(struct interface *iface, struct device *dev)
 273 {
 274         struct device *mdev = iface->main_dev.dev;
 275
 276         if (mdev && mdev->hotplug_ops)
 277                 return mdev->hotplug_ops->add(mdev, dev);
 278
 279         if (iface->main_dev.dev)
 280                 interface_remove_link(iface, NULL);
 281
 282         device_add_user(&iface->main_dev, dev);
 283
 284         return 0;
 285 }
 286
 287 int
 288 interface_set_up(struct interface *iface)
 289 {
 290         iface->autostart = true;
 291
 292         if (!iface->available) {
 293                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 294                 return -1;
 295         }
 296
 297         if (iface->state != IFS_DOWN)
 298                 return 0;
 299
 300         return __interface_set_up(iface);
 301 }
 302
 303 int
 304 interface_set_down(struct interface *iface)
 305 {
 306         if (!iface) {
 307                 vlist_for_each_element(&interfaces, iface, node)
 308                         __interface_set_down(iface, false);
 309         } else {
 310                 iface->autostart = false;
 311                 __interface_set_down(iface, false);
 312         }
 313
 314         return 0;
 315 }
 316
 317 void
 318 interface_start_pending(void)
 319 {
 320         struct interface *iface;
 321
 322         vlist_for_each_element(&interfaces, iface, node) {
 323                 if (iface->available && iface->autostart)
 324                         interface_set_up(iface);
 325         }
 326 }
 327
 328 static void
 329 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 330                  struct vlist_node *node_old)
 331 {
 332         struct interface *if_old = container_of(node_old, struct interface, node);
 333         struct interface *if_new = container_of(node_new, struct interface, node);
 334
 335         if (node_old) {
 336                 free(if_old->config);
 337                 netifd_ubus_remove_interface(if_old);
 338                 if (if_old->proto->free)
 339                         if_old->proto->free(if_old->proto);
 340                 free(if_old);
 341         }
 342
 343         if (node_new) {
 344                 proto_init_interface(if_new, if_new->config);
 345                 interface_ip_init(if_new);
 346                 netifd_ubus_add_interface(if_new);
 347         }
 348 }
 349
 350
 351 static void __init
 352 interface_init_list(void)
 353 {
 354         vlist_init(&interfaces, avl_strcmp, interface_update,
 355                    struct interface, node, name);
 356 }