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 static LIST_HEAD(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 struct interface *
 215 interface_alloc(const char *name, struct blob_attr *attr)
 216 {
 217         struct interface *iface;
 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         iface = interface_get(name);
 224         if (iface)
 225                 return iface;
 226
 227         iface = calloc(1, sizeof(*iface));
 228         iface->main_dev.cb = interface_cb;
 229         iface->l3_dev = &iface->main_dev;
 230         strncpy(iface->name, name, sizeof(iface->name) - 1);
 231         list_add_tail(&iface->list, &interfaces);
 232         INIT_LIST_HEAD(&iface->errors);
 233
 234         interface_ip_init(iface);
 235
 236         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 237                       blob_data(attr), blob_len(attr));
 238
 239         if ((cur = tb[IFACE_ATTR_PROTO]))
 240                 proto_name = blobmsg_data(cur);
 241
 242         proto_attach_interface(iface, proto_name);
 243
 244         if (iface->proto_handler &&
 245             !(iface->proto_handler->flags & PROTO_FLAG_NODEV) &&
 246             (cur = tb[IFACE_ATTR_IFNAME])) {
 247                 dev = device_get(blobmsg_data(cur), true);
 248                 if (dev)
 249                         device_add_user(&iface->main_dev, dev);
 250         }
 251
 252         if ((cur = tb[IFACE_ATTR_AUTO]))
 253                 iface->autostart = blobmsg_get_bool(cur);
 254         else
 255                 iface->autostart = true;
 256
 257         netifd_ubus_add_interface(iface);
 258         config_set_state(&iface->config, attr);
 259
 260         return iface;
 261 }
 262
 263 void
 264 interface_free(struct interface *iface)
 265 {
 266         netifd_ubus_remove_interface(iface);
 267         list_del(&iface->list);
 268         if (iface->proto->free)
 269                 iface->proto->free(iface->proto);
 270         free(iface);
 271 }
 272
 273 struct interface *
 274 interface_get(const char *name)
 275 {
 276         struct interface *iface;
 277
 278         list_for_each_entry(iface, &interfaces, list) {
 279                 if (!strcmp(iface->name, name))
 280                         return iface;
 281         }
 282         return NULL;
 283 }
 284
 285 void
 286 interface_remove_link(struct interface *iface, struct device *dev)
 287 {
 288         struct device *mdev = iface->main_dev.dev;
 289
 290         if (mdev && mdev->hotplug_ops) {
 291                 mdev->hotplug_ops->del(mdev, dev);
 292                 return;
 293         }
 294
 295         device_remove_user(&iface->main_dev);
 296 }
 297
 298 int
 299 interface_add_link(struct interface *iface, struct device *dev)
 300 {
 301         struct device *mdev = iface->main_dev.dev;
 302
 303         if (mdev && mdev->hotplug_ops)
 304                 return mdev->hotplug_ops->add(mdev, dev);
 305
 306         if (iface->main_dev.dev)
 307                 interface_remove_link(iface, NULL);
 308
 309         device_add_user(&iface->main_dev, dev);
 310
 311         return 0;
 312 }
 313
 314 int
 315 interface_set_up(struct interface *iface)
 316 {
 317         iface->autostart = true;
 318
 319         if (!iface->available) {
 320                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 321                 return -1;
 322         }
 323
 324         if (iface->state != IFS_DOWN)
 325                 return 0;
 326
 327         return __interface_set_up(iface);
 328 }
 329
 330 int
 331 interface_set_down(struct interface *iface)
 332 {
 333         if (!iface) {
 334                 list_for_each_entry(iface, &interfaces, list)
 335                         __interface_set_down(iface, false);
 336         } else {
 337                 iface->autostart = false;
 338                 __interface_set_down(iface, false);
 339         }
 340
 341         return 0;
 342 }
 343
 344 void
 345 interface_start_pending(void)
 346 {
 347         struct interface *iface;
 348
 349         list_for_each_entry(iface, &interfaces, list) {
 350                 if (iface->available && iface->autostart)
 351                         interface_set_up(iface);
 352         }
 353 }