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         device_release(&iface->main_dev);
  90         iface->state = IFS_DOWN;
  91 }
  92
  93 static int
  94 __interface_set_up(struct interface *iface)
  95 {
  96         int ret;
  97
  98         if (iface->state != IFS_DOWN)
  99                 return 0;
 100
 101         ret = device_claim(&iface->main_dev);
 102         if (ret)
 103                 return ret;
 104
 105         iface->state = IFS_SETUP;
 106         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 107         if (ret) {
 108                 mark_interface_down(iface);
 109                 return ret;
 110         }
 111
 112         return 0;
 113
 114 }
 115
 116 static void
 117 __interface_set_down(struct interface *iface, bool force)
 118 {
 119         clear_interface_errors(iface);
 120
 121         if (iface->state == IFS_DOWN ||
 122                 iface->state == IFS_TEARDOWN)
 123                 return;
 124
 125         iface->state = IFS_TEARDOWN;
 126         interface_event(iface, IFEV_DOWN);
 127         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 128 }
 129
 130 static void
 131 interface_cb(struct device_user *dep, enum device_event ev)
 132 {
 133         struct interface *iface;
 134         bool new_state;
 135
 136         iface = container_of(dep, struct interface, main_dev);
 137         switch (ev) {
 138         case DEV_EVENT_ADD:
 139                 new_state = true;
 140                 break;
 141         case DEV_EVENT_REMOVE:
 142                 new_state = false;
 143                 break;
 144         default:
 145                 return;
 146         }
 147
 148         if (iface->available == new_state)
 149                 return;
 150
 151         iface->available = new_state;
 152
 153         if (new_state) {
 154                 if (iface->autostart && !config_init)
 155                         interface_set_up(iface);
 156         } else
 157                 __interface_set_down(iface, true);
 158 }
 159
 160 static void
 161 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 162 {
 163         struct interface *iface = state->iface;
 164
 165         switch (ev) {
 166         case IFPEV_UP:
 167                 if (iface->state != IFS_SETUP)
 168                         return;
 169
 170                 iface->state = IFS_UP;
 171                 interface_event(iface, IFEV_UP);
 172                 break;
 173         case IFPEV_DOWN:
 174                 if (iface->state == IFS_DOWN)
 175                         return;
 176
 177                 mark_interface_down(iface);
 178                 break;
 179         }
 180 }
 181
 182 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 183 {
 184         if (iface->proto) {
 185                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
 186                 iface->proto->free(iface->proto);
 187                 iface->proto = NULL;
 188         }
 189         iface->state = IFS_DOWN;
 190         iface->proto = state;
 191         if (!state)
 192                 return;
 193
 194         state->proto_event = interface_proto_cb;
 195         state->iface = iface;
 196 }
 197
 198 struct interface *
 199 interface_alloc(const char *name, struct blob_attr *attr)
 200 {
 201         struct interface *iface;
 202         struct blob_attr *tb[IFACE_ATTR_MAX];
 203         struct blob_attr *cur;
 204         struct device *dev;
 205         const char *proto_name = NULL;
 206
 207         iface = interface_get(name);
 208         if (iface)
 209                 return iface;
 210
 211         iface = calloc(1, sizeof(*iface));
 212         iface->main_dev.cb = interface_cb;
 213         iface->l3_iface = &iface->main_dev;
 214         strncpy(iface->name, name, sizeof(iface->name) - 1);
 215         list_add_tail(&iface->list, &interfaces);
 216         INIT_LIST_HEAD(&iface->errors);
 217
 218         interface_ip_init(iface);
 219
 220         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 221                       blob_data(attr), blob_len(attr));
 222
 223         if ((cur = tb[IFACE_ATTR_PROTO]))
 224                 proto_name = blobmsg_data(cur);
 225
 226         proto_attach_interface(iface, proto_name);
 227
 228         if ((cur = tb[IFACE_ATTR_IFNAME])) {
 229                 dev = device_get(blobmsg_data(cur), true);
 230                 if (dev)
 231                         device_add_user(&iface->main_dev, dev);
 232         }
 233
 234         if ((cur = tb[IFACE_ATTR_AUTO]))
 235                 iface->autostart = blobmsg_get_bool(cur);
 236         else
 237                 iface->autostart = true;
 238
 239         netifd_ubus_add_interface(iface);
 240         config_set_state(&iface->config, attr);
 241
 242         return iface;
 243 }
 244
 245 void
 246 interface_free(struct interface *iface)
 247 {
 248         netifd_ubus_remove_interface(iface);
 249         list_del(&iface->list);
 250         if (iface->proto->free)
 251                 iface->proto->free(iface->proto);
 252         free(iface);
 253 }
 254
 255 struct interface *
 256 interface_get(const char *name)
 257 {
 258         struct interface *iface;
 259
 260         list_for_each_entry(iface, &interfaces, list) {
 261                 if (!strcmp(iface->name, name))
 262                         return iface;
 263         }
 264         return NULL;
 265 }
 266
 267 void
 268 interface_remove_link(struct interface *iface, struct device *dev)
 269 {
 270         struct device *mdev = iface->main_dev.dev;
 271
 272         if (mdev && mdev->hotplug_ops) {
 273                 mdev->hotplug_ops->del(mdev, dev);
 274                 return;
 275         }
 276
 277         device_remove_user(&iface->main_dev);
 278 }
 279
 280 int
 281 interface_add_link(struct interface *iface, struct device *dev)
 282 {
 283         struct device *mdev = iface->main_dev.dev;
 284
 285         if (mdev && mdev->hotplug_ops)
 286                 return mdev->hotplug_ops->add(mdev, dev);
 287
 288         if (iface->main_dev.dev)
 289                 interface_remove_link(iface, NULL);
 290
 291         device_add_user(&iface->main_dev, dev);
 292
 293         return 0;
 294 }
 295
 296 int
 297 interface_set_up(struct interface *iface)
 298 {
 299         iface->autostart = true;
 300
 301         if (!iface->available) {
 302                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 303                 return -1;
 304         }
 305
 306         if (iface->state != IFS_DOWN)
 307                 return 0;
 308
 309         return __interface_set_up(iface);
 310 }
 311
 312 int
 313 interface_set_down(struct interface *iface)
 314 {
 315         iface->autostart = false;
 316         __interface_set_down(iface, false);
 317
 318         return 0;
 319 }
 320
 321 void
 322 interface_start_pending(void)
 323 {
 324         struct interface *iface;
 325
 326         list_for_each_entry(iface, &interfaces, list) {
 327                 if (iface->available && iface->autostart)
 328                         interface_set_up(iface);
 329         }
 330 }