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_ctx_addr(iface, NULL);
  93         device_release(&iface->main_dev);
  94         iface->state = IFS_DOWN;
  95 }
  96
  97 static int
  98 __interface_set_up(struct interface *iface)
  99 {
 100         int ret;
 101
 102         if (iface->state != IFS_DOWN)
 103                 return 0;
 104
 105         ret = device_claim(&iface->main_dev);
 106         if (ret)
 107                 return ret;
 108
 109         iface->state = IFS_SETUP;
 110         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 111         if (ret) {
 112                 mark_interface_down(iface);
 113                 return ret;
 114         }
 115
 116         return 0;
 117
 118 }
 119
 120 static void
 121 __interface_set_down(struct interface *iface, bool force)
 122 {
 123         clear_interface_errors(iface);
 124
 125         if (iface->state == IFS_DOWN ||
 126                 iface->state == IFS_TEARDOWN)
 127                 return;
 128
 129         iface->state = IFS_TEARDOWN;
 130         interface_event(iface, IFEV_DOWN);
 131
 132         interface_del_all_routes(iface);
 133         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 134 }
 135
 136 static void
 137 interface_cb(struct device_user *dep, enum device_event ev)
 138 {
 139         struct interface *iface;
 140         bool new_state;
 141
 142         iface = container_of(dep, struct interface, main_dev);
 143         switch (ev) {
 144         case DEV_EVENT_ADD:
 145                 new_state = true;
 146                 break;
 147         case DEV_EVENT_REMOVE:
 148                 new_state = false;
 149                 break;
 150         default:
 151                 return;
 152         }
 153
 154         if (iface->active == new_state)
 155                 return;
 156
 157         iface->active = new_state;
 158
 159         if (new_state) {
 160                 if (iface->autostart && !config_init)
 161                         interface_set_up(iface);
 162         } else
 163                 __interface_set_down(iface, true);
 164 }
 165
 166 static void
 167 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 168 {
 169         struct interface *iface = state->iface;
 170
 171         switch (ev) {
 172         case IFPEV_UP:
 173                 if (iface->state != IFS_SETUP)
 174                         return;
 175
 176                 iface->state = IFS_UP;
 177                 interface_event(iface, IFEV_UP);
 178                 break;
 179         case IFPEV_DOWN:
 180                 if (iface->state == IFS_DOWN)
 181                         return;
 182
 183                 mark_interface_down(iface);
 184                 break;
 185         }
 186 }
 187
 188 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 189 {
 190         if (iface->proto) {
 191                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
 192                 iface->proto->free(iface->proto);
 193                 iface->proto = NULL;
 194         }
 195         iface->state = IFS_DOWN;
 196         iface->proto = state;
 197         if (!state)
 198                 return;
 199
 200         state->proto_event = interface_proto_cb;
 201         state->iface = iface;
 202 }
 203
 204 struct interface *
 205 interface_alloc(const char *name, struct blob_attr *attr)
 206 {
 207         struct interface *iface;
 208         struct blob_attr *tb[IFACE_ATTR_MAX];
 209         struct blob_attr *cur;
 210         struct device *dev;
 211         const char *proto_name = NULL;
 212
 213         iface = interface_get(name);
 214         if (iface)
 215                 return iface;
 216
 217         iface = calloc(1, sizeof(*iface));
 218         iface->main_dev.cb = interface_cb;
 219         iface->l3_iface = &iface->main_dev;
 220         strncpy(iface->name, name, sizeof(iface->name) - 1);
 221         list_add_tail(&iface->list, &interfaces);
 222         INIT_LIST_HEAD(&iface->errors);
 223         INIT_LIST_HEAD(&iface->address);
 224         INIT_LIST_HEAD(&iface->routes);
 225
 226         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 227                       blob_data(attr), blob_len(attr));
 228
 229         if ((cur = tb[IFACE_ATTR_PROTO]))
 230                 proto_name = blobmsg_data(cur);
 231
 232         proto_attach_interface(iface, proto_name);
 233
 234         if ((cur = tb[IFACE_ATTR_IFNAME])) {
 235                 dev = device_get(blobmsg_data(cur), true);
 236                 if (dev)
 237                         device_add_user(&iface->main_dev, dev);
 238         }
 239
 240         netifd_ubus_add_interface(iface);
 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->active) {
 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->active && iface->autostart)
 328                         interface_set_up(iface);
 329         }
 330 }