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 "proto.h"
   9 #include "ubus.h"
  10 #include "config.h"
  11
  12 static LIST_HEAD(interfaces);
  13
  14 enum {
  15         IFACE_ATTR_TYPE,
  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_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  28         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  29         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_ARRAY },
  30         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  31 };
  32
  33 const struct config_param_list interface_attr_list = {
  34         .n_params = IFACE_ATTR_MAX,
  35         .params = iface_attrs,
  36         .info = iface_attr_info,
  37 };
  38
  39 static void
  40 clear_interface_errors(struct interface *iface)
  41 {
  42         struct interface_error *error, *tmp;
  43
  44         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  45                 list_del(&error->list);
  46                 free(error);
  47         }
  48 }
  49
  50 void interface_add_error(struct interface *iface, const char *subsystem,
  51                          const char *code, const char **data, int n_data)
  52 {
  53         struct interface_error *error;
  54         int i, len = 0;
  55         int *datalen = NULL;
  56         char *dest;
  57
  58         if (n_data) {
  59                 len = n_data * sizeof(char *);
  60                 datalen = alloca(len);
  61                 for (i = 0; i < n_data; i++) {
  62                         datalen[i] = strlen(data[i]) + 1;
  63                         len += datalen[i];
  64                 }
  65         }
  66
  67         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  68         if (!error)
  69                 return;
  70
  71         list_add_tail(&error->list, &iface->errors);
  72         error->subsystem = subsystem;
  73         error->code = code;
  74
  75         dest = (char *) &error->data[n_data + 1];
  76         for (i = 0; i < n_data; i++) {
  77                 error->data[i] = dest;
  78                 memcpy(dest, data[i], datalen[i]);
  79                 dest += datalen[i];
  80         }
  81         error->data[n_data] = NULL;
  82 }
  83
  84 static void
  85 interface_event(struct interface *iface, enum interface_event ev)
  86 {
  87         /* TODO */
  88 }
  89
  90 static void
  91 mark_interface_down(struct interface *iface)
  92 {
  93         interface_del_ctx_addr(iface, NULL);
  94         device_release(iface->main_dev.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.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 __set_interface_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                 __set_interface_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 alloc_interface(const char *name, struct uci_section *s, 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
 213         iface = get_interface(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(&iface->list, &interfaces);
 222         INIT_LIST_HEAD(&iface->errors);
 223         INIT_LIST_HEAD(&iface->address);
 224         INIT_LIST_HEAD(&iface->routes);
 225
 226         proto_attach_interface(iface, s);
 227
 228         netifd_ubus_add_interface(iface);
 229
 230         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 231                       blob_data(attr), blob_len(attr));
 232
 233         if ((cur = tb[IFACE_ATTR_TYPE])) {
 234                 if (!strcmp(blobmsg_data(cur), "bridge"))
 235                         interface_attach_bridge(iface, s);
 236         }
 237
 238         if ((cur = tb[IFACE_ATTR_IFNAME])) {
 239                 dev = device_get(blobmsg_data(cur), true);
 240                 if (dev)
 241                         device_add_user(&iface->main_dev, dev);
 242         }
 243
 244         return iface;
 245 }
 246
 247 void
 248 free_interface(struct interface *iface)
 249 {
 250         netifd_ubus_remove_interface(iface);
 251         list_del(&iface->list);
 252         if (iface->proto->free)
 253                 iface->proto->free(iface->proto);
 254         free(iface);
 255 }
 256
 257 struct interface *
 258 get_interface(const char *name)
 259 {
 260         struct interface *iface;
 261
 262         list_for_each_entry(iface, &interfaces, list) {
 263                 if (!strcmp(iface->name, name))
 264                         return iface;
 265         }
 266         return NULL;
 267 }
 268
 269 void
 270 interface_remove_link(struct interface *iface, struct device *dev)
 271 {
 272         struct device *mdev = iface->main_dev.dev;
 273
 274         if (mdev && mdev->hotplug_ops) {
 275                 mdev->hotplug_ops->del(mdev, dev);
 276                 return;
 277         }
 278
 279         device_remove_user(&iface->main_dev);
 280 }
 281
 282 int
 283 interface_add_link(struct interface *iface, struct device *dev)
 284 {
 285         struct device *mdev = iface->main_dev.dev;
 286
 287         if (mdev && mdev->hotplug_ops)
 288                 return mdev->hotplug_ops->add(mdev, dev);
 289
 290         if (iface->main_dev.dev)
 291                 interface_remove_link(iface, NULL);
 292
 293         device_add_user(&iface->main_dev, dev);
 294
 295         return 0;
 296 }
 297
 298 int
 299 interface_set_up(struct interface *iface)
 300 {
 301         iface->autostart = true;
 302
 303         if (!iface->active) {
 304                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 305                 return -1;
 306         }
 307
 308         if (iface->state != IFS_DOWN)
 309                 return 0;
 310
 311         return __interface_set_up(iface);
 312 }
 313
 314 int
 315 set_interface_down(struct interface *iface)
 316 {
 317         iface->autostart = false;
 318         __set_interface_down(iface, false);
 319
 320         return 0;
 321 }
 322
 323 void
 324 start_pending_interfaces(void)
 325 {
 326         struct interface *iface;
 327
 328         list_for_each_entry(iface, &interfaces, list) {
 329                 if (iface->active && iface->autostart)
 330                         interface_set_up(iface);
 331         }
 332 }