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_IFNAME,
  16         IFACE_ATTR_PROTO,
  17         IFACE_ATTR_AUTO,
  18         IFACE_ATTR_MAX
  19 };
  20
  21 static const union config_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  22         [IFACE_ATTR_IFNAME].type = BLOBMSG_TYPE_STRING,
  23 };
  24
  25 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  26         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  27         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  28         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  29 };
  30
  31 const struct config_param_list interface_attr_list = {
  32         .n_params = IFACE_ATTR_MAX,
  33         .params = iface_attrs,
  34         .info = iface_attr_info,
  35 };
  36
  37 static void
  38 clear_interface_errors(struct interface *iface)
  39 {
  40         struct interface_error *error, *tmp;
  41
  42         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  43                 list_del(&error->list);
  44                 free(error);
  45         }
  46 }
  47
  48 void interface_add_error(struct interface *iface, const char *subsystem,
  49                          const char *code, const char **data, int n_data)
  50 {
  51         struct interface_error *error;
  52         int i, len = 0;
  53         int *datalen = NULL;
  54         char *dest;
  55
  56         if (n_data) {
  57                 len = n_data * sizeof(char *);
  58                 datalen = alloca(len);
  59                 for (i = 0; i < n_data; i++) {
  60                         datalen[i] = strlen(data[i]) + 1;
  61                         len += datalen[i];
  62                 }
  63         }
  64
  65         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  66         if (!error)
  67                 return;
  68
  69         list_add_tail(&error->list, &iface->errors);
  70         error->subsystem = subsystem;
  71         error->code = code;
  72
  73         dest = (char *) &error->data[n_data + 1];
  74         for (i = 0; i < n_data; i++) {
  75                 error->data[i] = dest;
  76                 memcpy(dest, data[i], datalen[i]);
  77                 dest += datalen[i];
  78         }
  79         error->data[n_data] = NULL;
  80 }
  81
  82 static void
  83 interface_event(struct interface *iface, enum interface_event ev)
  84 {
  85         /* TODO */
  86 }
  87
  88 static void
  89 mark_interface_down(struct interface *iface)
  90 {
  91         interface_del_ctx_addr(iface, NULL);
  92         device_release(&iface->main_dev);
  93         iface->state = IFS_DOWN;
  94 }
  95
  96 static int
  97 __interface_set_up(struct interface *iface)
  98 {
  99         int ret;
 100
 101         if (iface->state != IFS_DOWN)
 102                 return 0;
 103
 104         ret = device_claim(&iface->main_dev);
 105         if (ret)
 106                 return ret;
 107
 108         iface->state = IFS_SETUP;
 109         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 110         if (ret) {
 111                 mark_interface_down(iface);
 112                 return ret;
 113         }
 114
 115         return 0;
 116
 117 }
 118
 119 static void
 120 __interface_set_down(struct interface *iface, bool force)
 121 {
 122         clear_interface_errors(iface);
 123
 124         if (iface->state == IFS_DOWN ||
 125                 iface->state == IFS_TEARDOWN)
 126                 return;
 127
 128         iface->state = IFS_TEARDOWN;
 129         interface_event(iface, IFEV_DOWN);
 130
 131         interface_del_all_routes(iface);
 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->active == new_state)
 154                 return;
 155
 156         iface->active = 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         INIT_LIST_HEAD(&iface->address);
 223         INIT_LIST_HEAD(&iface->routes);
 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         netifd_ubus_add_interface(iface);
 240
 241         return iface;
 242 }
 243
 244 void
 245 interface_free(struct interface *iface)
 246 {
 247         netifd_ubus_remove_interface(iface);
 248         list_del(&iface->list);
 249         if (iface->proto->free)
 250                 iface->proto->free(iface->proto);
 251         free(iface);
 252 }
 253
 254 struct interface *
 255 interface_get(const char *name)
 256 {
 257         struct interface *iface;
 258
 259         list_for_each_entry(iface, &interfaces, list) {
 260                 if (!strcmp(iface->name, name))
 261                         return iface;
 262         }
 263         return NULL;
 264 }
 265
 266 void
 267 interface_remove_link(struct interface *iface, struct device *dev)
 268 {
 269         struct device *mdev = iface->main_dev.dev;
 270
 271         if (mdev && mdev->hotplug_ops) {
 272                 mdev->hotplug_ops->del(mdev, dev);
 273                 return;
 274         }
 275
 276         device_remove_user(&iface->main_dev);
 277 }
 278
 279 int
 280 interface_add_link(struct interface *iface, struct device *dev)
 281 {
 282         struct device *mdev = iface->main_dev.dev;
 283
 284         if (mdev && mdev->hotplug_ops)
 285                 return mdev->hotplug_ops->add(mdev, dev);
 286
 287         if (iface->main_dev.dev)
 288                 interface_remove_link(iface, NULL);
 289
 290         device_add_user(&iface->main_dev, dev);
 291
 292         return 0;
 293 }
 294
 295 int
 296 interface_set_up(struct interface *iface)
 297 {
 298         iface->autostart = true;
 299
 300         if (!iface->active) {
 301                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 302                 return -1;
 303         }
 304
 305         if (iface->state != IFS_DOWN)
 306                 return 0;
 307
 308         return __interface_set_up(iface);
 309 }
 310
 311 int
 312 interface_set_down(struct interface *iface)
 313 {
 314         iface->autostart = false;
 315         __interface_set_down(iface, false);
 316
 317         return 0;
 318 }
 319
 320 void
 321 interface_start_pending(void)
 322 {
 323         struct interface *iface;
 324
 325         list_for_each_entry(iface, &interfaces, list) {
 326                 if (iface->active && iface->autostart)
 327                         interface_set_up(iface);
 328         }
 329 }