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 union config_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  23         [IFACE_ATTR_IFNAME].type = BLOBMSG_TYPE_STRING,
  24 };
  25
  26 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  27         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  28         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  29         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  30 };
  31
  32 const struct config_param_list interface_attr_list = {
  33         .n_params = IFACE_ATTR_MAX,
  34         .params = iface_attrs,
  35         .info = iface_attr_info,
  36 };
  37
  38 static void
  39 clear_interface_errors(struct interface *iface)
  40 {
  41         struct interface_error *error, *tmp;
  42
  43         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  44                 list_del(&error->list);
  45                 free(error);
  46         }
  47 }
  48
  49 void interface_add_error(struct interface *iface, const char *subsystem,
  50                          const char *code, const char **data, int n_data)
  51 {
  52         struct interface_error *error;
  53         int i, len = 0;
  54         int *datalen = NULL;
  55         char *dest;
  56
  57         if (n_data) {
  58                 len = n_data * sizeof(char *);
  59                 datalen = alloca(len);
  60                 for (i = 0; i < n_data; i++) {
  61                         datalen[i] = strlen(data[i]) + 1;
  62                         len += datalen[i];
  63                 }
  64         }
  65
  66         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  67         if (!error)
  68                 return;
  69
  70         list_add_tail(&error->list, &iface->errors);
  71         error->subsystem = subsystem;
  72         error->code = code;
  73
  74         dest = (char *) &error->data[n_data + 1];
  75         for (i = 0; i < n_data; i++) {
  76                 error->data[i] = dest;
  77                 memcpy(dest, data[i], datalen[i]);
  78                 dest += datalen[i];
  79         }
  80         error->data[n_data] = NULL;
  81 }
  82
  83 static void
  84 interface_event(struct interface *iface, enum interface_event ev)
  85 {
  86         /* TODO */
  87 }
  88
  89 static void
  90 mark_interface_down(struct interface *iface)
  91 {
  92         interface_del_all_routes(iface);
  93         interface_del_ctx_addr(iface, NULL);
  94         device_release(&iface->main_dev);
  95         iface->state = IFS_DOWN;
  96 }
  97
  98 static int
  99 __interface_set_up(struct interface *iface)
 100 {
 101         int ret;
 102
 103         if (iface->state != IFS_DOWN)
 104                 return 0;
 105
 106         ret = device_claim(&iface->main_dev);
 107         if (ret)
 108                 return ret;
 109
 110         iface->state = IFS_SETUP;
 111         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 112         if (ret) {
 113                 mark_interface_down(iface);
 114                 return ret;
 115         }
 116
 117         return 0;
 118
 119 }
 120
 121 static void
 122 __interface_set_down(struct interface *iface, bool force)
 123 {
 124         clear_interface_errors(iface);
 125
 126         if (iface->state == IFS_DOWN ||
 127                 iface->state == IFS_TEARDOWN)
 128                 return;
 129
 130         iface->state = IFS_TEARDOWN;
 131         interface_event(iface, IFEV_DOWN);
 132
 133         interface_del_all_routes(iface);
 134         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 135 }
 136
 137 static void
 138 interface_cb(struct device_user *dep, enum device_event ev)
 139 {
 140         struct interface *iface;
 141         bool new_state;
 142
 143         iface = container_of(dep, struct interface, main_dev);
 144         switch (ev) {
 145         case DEV_EVENT_ADD:
 146                 new_state = true;
 147                 break;
 148         case DEV_EVENT_REMOVE:
 149                 new_state = false;
 150                 break;
 151         default:
 152                 return;
 153         }
 154
 155         if (iface->active == new_state)
 156                 return;
 157
 158         iface->active = new_state;
 159
 160         if (new_state) {
 161                 if (iface->autostart && !config_init)
 162                         interface_set_up(iface);
 163         } else
 164                 __interface_set_down(iface, true);
 165 }
 166
 167 static void
 168 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 169 {
 170         struct interface *iface = state->iface;
 171
 172         switch (ev) {
 173         case IFPEV_UP:
 174                 if (iface->state != IFS_SETUP)
 175                         return;
 176
 177                 iface->state = IFS_UP;
 178                 interface_event(iface, IFEV_UP);
 179                 break;
 180         case IFPEV_DOWN:
 181                 if (iface->state == IFS_DOWN)
 182                         return;
 183
 184                 mark_interface_down(iface);
 185                 break;
 186         }
 187 }
 188
 189 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 190 {
 191         if (iface->proto) {
 192                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
 193                 iface->proto->free(iface->proto);
 194                 iface->proto = NULL;
 195         }
 196         iface->state = IFS_DOWN;
 197         iface->proto = state;
 198         if (!state)
 199                 return;
 200
 201         state->proto_event = interface_proto_cb;
 202         state->iface = iface;
 203 }
 204
 205 struct interface *
 206 interface_alloc(const char *name, struct blob_attr *attr)
 207 {
 208         struct interface *iface;
 209         struct blob_attr *tb[IFACE_ATTR_MAX];
 210         struct blob_attr *cur;
 211         struct device *dev;
 212         const char *proto_name = NULL;
 213
 214         iface = interface_get(name);
 215         if (iface)
 216                 return iface;
 217
 218         iface = calloc(1, sizeof(*iface));
 219         iface->main_dev.cb = interface_cb;
 220         iface->l3_iface = &iface->main_dev;
 221         strncpy(iface->name, name, sizeof(iface->name) - 1);
 222         list_add_tail(&iface->list, &interfaces);
 223         INIT_LIST_HEAD(&iface->errors);
 224         INIT_LIST_HEAD(&iface->address);
 225         INIT_LIST_HEAD(&iface->routes);
 226
 227         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 228                       blob_data(attr), blob_len(attr));
 229
 230         if ((cur = tb[IFACE_ATTR_PROTO]))
 231                 proto_name = blobmsg_data(cur);
 232
 233         proto_attach_interface(iface, proto_name);
 234
 235         if ((cur = tb[IFACE_ATTR_IFNAME])) {
 236                 dev = device_get(blobmsg_data(cur), true);
 237                 if (dev)
 238                         device_add_user(&iface->main_dev, dev);
 239         }
 240
 241         if ((cur = tb[IFACE_ATTR_AUTO]))
 242                 iface->autostart = blobmsg_get_bool(cur);
 243         else
 244                 iface->autostart = true;
 245
 246         netifd_ubus_add_interface(iface);
 247         config_set_state(&iface->config, attr);
 248
 249         return iface;
 250 }
 251
 252 void
 253 interface_free(struct interface *iface)
 254 {
 255         netifd_ubus_remove_interface(iface);
 256         list_del(&iface->list);
 257         if (iface->proto->free)
 258                 iface->proto->free(iface->proto);
 259         free(iface);
 260 }
 261
 262 struct interface *
 263 interface_get(const char *name)
 264 {
 265         struct interface *iface;
 266
 267         list_for_each_entry(iface, &interfaces, list) {
 268                 if (!strcmp(iface->name, name))
 269                         return iface;
 270         }
 271         return NULL;
 272 }
 273
 274 void
 275 interface_remove_link(struct interface *iface, struct device *dev)
 276 {
 277         struct device *mdev = iface->main_dev.dev;
 278
 279         if (mdev && mdev->hotplug_ops) {
 280                 mdev->hotplug_ops->del(mdev, dev);
 281                 return;
 282         }
 283
 284         device_remove_user(&iface->main_dev);
 285 }
 286
 287 int
 288 interface_add_link(struct interface *iface, struct device *dev)
 289 {
 290         struct device *mdev = iface->main_dev.dev;
 291
 292         if (mdev && mdev->hotplug_ops)
 293                 return mdev->hotplug_ops->add(mdev, dev);
 294
 295         if (iface->main_dev.dev)
 296                 interface_remove_link(iface, NULL);
 297
 298         device_add_user(&iface->main_dev, dev);
 299
 300         return 0;
 301 }
 302
 303 int
 304 interface_set_up(struct interface *iface)
 305 {
 306         iface->autostart = true;
 307
 308         if (!iface->active) {
 309                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 310                 return -1;
 311         }
 312
 313         if (iface->state != IFS_DOWN)
 314                 return 0;
 315
 316         return __interface_set_up(iface);
 317 }
 318
 319 int
 320 interface_set_down(struct interface *iface)
 321 {
 322         iface->autostart = false;
 323         __interface_set_down(iface, false);
 324
 325         return 0;
 326 }
 327
 328 void
 329 interface_start_pending(void)
 330 {
 331         struct interface *iface;
 332
 333         list_for_each_entry(iface, &interfaces, list) {
 334                 if (iface->active && iface->autostart)
 335                         interface_set_up(iface);
 336         }
 337 }