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         vlist_flush_all(&iface->proto_addr);
  93         vlist_flush_all(&iface->proto_route);
  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         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 133 }
 134
 135 static void
 136 interface_cb(struct device_user *dep, enum device_event ev)
 137 {
 138         struct interface *iface;
 139         bool new_state;
 140
 141         iface = container_of(dep, struct interface, main_dev);
 142         switch (ev) {
 143         case DEV_EVENT_ADD:
 144                 new_state = true;
 145                 break;
 146         case DEV_EVENT_REMOVE:
 147                 new_state = false;
 148                 break;
 149         default:
 150                 return;
 151         }
 152
 153         if (iface->available == new_state)
 154                 return;
 155
 156         iface->available = new_state;
 157
 158         if (new_state) {
 159                 if (iface->autostart && !config_init)
 160                         interface_set_up(iface);
 161         } else
 162                 __interface_set_down(iface, true);
 163 }
 164
 165 static void
 166 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 167 {
 168         struct interface *iface = state->iface;
 169
 170         switch (ev) {
 171         case IFPEV_UP:
 172                 if (iface->state != IFS_SETUP)
 173                         return;
 174
 175                 iface->state = IFS_UP;
 176                 interface_event(iface, IFEV_UP);
 177                 break;
 178         case IFPEV_DOWN:
 179                 if (iface->state == IFS_DOWN)
 180                         return;
 181
 182                 mark_interface_down(iface);
 183                 break;
 184         }
 185 }
 186
 187 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 188 {
 189         if (iface->proto) {
 190                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
 191                 iface->proto->free(iface->proto);
 192                 iface->proto = NULL;
 193         }
 194         iface->state = IFS_DOWN;
 195         iface->proto = state;
 196         if (!state)
 197                 return;
 198
 199         state->proto_event = interface_proto_cb;
 200         state->iface = iface;
 201 }
 202
 203 struct interface *
 204 interface_alloc(const char *name, struct blob_attr *attr)
 205 {
 206         struct interface *iface;
 207         struct blob_attr *tb[IFACE_ATTR_MAX];
 208         struct blob_attr *cur;
 209         struct device *dev;
 210         const char *proto_name = NULL;
 211
 212         iface = interface_get(name);
 213         if (iface)
 214                 return iface;
 215
 216         iface = calloc(1, sizeof(*iface));
 217         iface->main_dev.cb = interface_cb;
 218         iface->l3_iface = &iface->main_dev;
 219         strncpy(iface->name, name, sizeof(iface->name) - 1);
 220         list_add_tail(&iface->list, &interfaces);
 221         INIT_LIST_HEAD(&iface->errors);
 222
 223         interface_ip_init(iface);
 224
 225         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 226                       blob_data(attr), blob_len(attr));
 227
 228         if ((cur = tb[IFACE_ATTR_PROTO]))
 229                 proto_name = blobmsg_data(cur);
 230
 231         proto_attach_interface(iface, proto_name);
 232
 233         if ((cur = tb[IFACE_ATTR_IFNAME])) {
 234                 dev = device_get(blobmsg_data(cur), true);
 235                 if (dev)
 236                         device_add_user(&iface->main_dev, dev);
 237         }
 238
 239         if ((cur = tb[IFACE_ATTR_AUTO]))
 240                 iface->autostart = blobmsg_get_bool(cur);
 241         else
 242                 iface->autostart = true;
 243
 244         netifd_ubus_add_interface(iface);
 245         config_set_state(&iface->config, attr);
 246
 247         return iface;
 248 }
 249
 250 void
 251 interface_free(struct interface *iface)
 252 {
 253         netifd_ubus_remove_interface(iface);
 254         list_del(&iface->list);
 255         if (iface->proto->free)
 256                 iface->proto->free(iface->proto);
 257         free(iface);
 258 }
 259
 260 struct interface *
 261 interface_get(const char *name)
 262 {
 263         struct interface *iface;
 264
 265         list_for_each_entry(iface, &interfaces, list) {
 266                 if (!strcmp(iface->name, name))
 267                         return iface;
 268         }
 269         return NULL;
 270 }
 271
 272 void
 273 interface_remove_link(struct interface *iface, struct device *dev)
 274 {
 275         struct device *mdev = iface->main_dev.dev;
 276
 277         if (mdev && mdev->hotplug_ops) {
 278                 mdev->hotplug_ops->del(mdev, dev);
 279                 return;
 280         }
 281
 282         device_remove_user(&iface->main_dev);
 283 }
 284
 285 int
 286 interface_add_link(struct interface *iface, struct device *dev)
 287 {
 288         struct device *mdev = iface->main_dev.dev;
 289
 290         if (mdev && mdev->hotplug_ops)
 291                 return mdev->hotplug_ops->add(mdev, dev);
 292
 293         if (iface->main_dev.dev)
 294                 interface_remove_link(iface, NULL);
 295
 296         device_add_user(&iface->main_dev, dev);
 297
 298         return 0;
 299 }
 300
 301 int
 302 interface_set_up(struct interface *iface)
 303 {
 304         iface->autostart = true;
 305
 306         if (!iface->available) {
 307                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 308                 return -1;
 309         }
 310
 311         if (iface->state != IFS_DOWN)
 312                 return 0;
 313
 314         return __interface_set_up(iface);
 315 }
 316
 317 int
 318 interface_set_down(struct interface *iface)
 319 {
 320         iface->autostart = false;
 321         __interface_set_down(iface, false);
 322
 323         return 0;
 324 }
 325
 326 void
 327 interface_start_pending(void)
 328 {
 329         struct interface *iface;
 330
 331         list_for_each_entry(iface, &interfaces, list) {
 332                 if (iface->available && iface->autostart)
 333                         interface_set_up(iface);
 334         }
 335 }