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
  11 static LIST_HEAD(interfaces);
  12
  13 static void
  14 clear_interface_errors(struct interface *iface)
  15 {
  16         struct interface_error *error, *tmp;
  17
  18         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  19                 list_del(&error->list);
  20                 free(error);
  21         }
  22 }
  23
  24 void interface_add_error(struct interface *iface, const char *subsystem,
  25                          const char *code, const char **data, int n_data)
  26 {
  27         struct interface_error *error;
  28         int i, len = 0;
  29         int *datalen = NULL;
  30         char *dest;
  31
  32         if (n_data) {
  33                 len = n_data * sizeof(char *);
  34                 datalen = alloca(len);
  35                 for (i = 0; i < n_data; i++) {
  36                         datalen[i] = strlen(data[i]) + 1;
  37                         len += datalen[i];
  38                 }
  39         }
  40
  41         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  42         if (!error)
  43                 return;
  44
  45         list_add_tail(&error->list, &iface->errors);
  46         error->subsystem = subsystem;
  47         error->code = code;
  48
  49         dest = (char *) &error->data[n_data + 1];
  50         for (i = 0; i < n_data; i++) {
  51                 error->data[i] = dest;
  52                 memcpy(dest, data[i], datalen[i]);
  53                 dest += datalen[i];
  54         }
  55         error->data[n_data] = NULL;
  56 }
  57
  58 static void
  59 interface_event(struct interface *iface, enum interface_event ev)
  60 {
  61         /* TODO */
  62 }
  63
  64 static void
  65 mark_interface_down(struct interface *iface)
  66 {
  67         interface_del_ctx_addr(iface, NULL);
  68         release_device(iface->main_dev.dev);
  69         iface->state = IFS_DOWN;
  70 }
  71
  72 static int
  73 __set_interface_up(struct interface *iface)
  74 {
  75         int ret;
  76
  77         if (iface->state != IFS_DOWN)
  78                 return 0;
  79
  80         ret = claim_device(iface->main_dev.dev);
  81         if (ret)
  82                 return ret;
  83
  84         iface->state = IFS_SETUP;
  85         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
  86         if (ret) {
  87                 mark_interface_down(iface);
  88                 return ret;
  89         }
  90
  91         return 0;
  92
  93 }
  94
  95 static void
  96 __set_interface_down(struct interface *iface, bool force)
  97 {
  98         clear_interface_errors(iface);
  99
 100         if (iface->state == IFS_DOWN ||
 101                 iface->state == IFS_TEARDOWN)
 102                 return;
 103
 104         iface->state = IFS_TEARDOWN;
 105         interface_event(iface, IFEV_DOWN);
 106
 107         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 108 }
 109
 110 static void
 111 interface_cb(struct device_user *dep, enum device_event ev)
 112 {
 113         struct interface *iface;
 114         bool new_state;
 115
 116         iface = container_of(dep, struct interface, main_dev);
 117         switch (ev) {
 118         case DEV_EVENT_ADD:
 119                 new_state = true;
 120                 break;
 121         case DEV_EVENT_REMOVE:
 122                 new_state = false;
 123                 break;
 124         default:
 125                 return;
 126         }
 127
 128         if (iface->active == new_state)
 129                 return;
 130
 131         iface->active = new_state;
 132
 133         if (new_state) {
 134                 if (iface->autostart && !config_init)
 135                         set_interface_up(iface);
 136         } else
 137                 __set_interface_down(iface, true);
 138 }
 139
 140 static void
 141 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 142 {
 143         struct interface *iface = state->iface;
 144
 145         switch (ev) {
 146         case IFPEV_UP:
 147                 if (iface->state != IFS_SETUP)
 148                         return;
 149
 150                 iface->state = IFS_UP;
 151                 interface_event(iface, IFEV_UP);
 152                 break;
 153         case IFPEV_DOWN:
 154                 if (iface->state == IFS_DOWN)
 155                         return;
 156
 157                 mark_interface_down(iface);
 158                 break;
 159         }
 160 }
 161
 162 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 163 {
 164         if (iface->proto) {
 165                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
 166                 iface->proto->free(iface->proto);
 167                 iface->proto = NULL;
 168         }
 169         iface->state = IFS_DOWN;
 170         iface->proto = state;
 171         if (!state)
 172                 return;
 173
 174         state->proto_event = interface_proto_cb;
 175         state->iface = iface;
 176 }
 177
 178 struct interface *
 179 alloc_interface(const char *name, struct uci_section *s)
 180 {
 181         struct interface *iface;
 182
 183         iface = get_interface(name);
 184         if (iface)
 185                 return iface;
 186
 187         iface = calloc(1, sizeof(*iface));
 188         iface->main_dev.cb = interface_cb;
 189         iface->l3_iface = &iface->main_dev;
 190         strncpy(iface->name, name, sizeof(iface->name) - 1);
 191         list_add(&iface->list, &interfaces);
 192         INIT_LIST_HEAD(&iface->errors);
 193         INIT_LIST_HEAD(&iface->address);
 194         INIT_LIST_HEAD(&iface->routes);
 195
 196         proto_attach_interface(iface, s);
 197
 198         netifd_ubus_add_interface(iface);
 199
 200         return iface;
 201 }
 202
 203 void
 204 free_interface(struct interface *iface)
 205 {
 206         netifd_ubus_remove_interface(iface);
 207         list_del(&iface->list);
 208         if (iface->proto->free)
 209                 iface->proto->free(iface->proto);
 210         free(iface);
 211 }
 212
 213 struct interface *
 214 get_interface(const char *name)
 215 {
 216         struct interface *iface;
 217
 218         list_for_each_entry(iface, &interfaces, list) {
 219                 if (!strcmp(iface->name, name))
 220                         return iface;
 221         }
 222         return NULL;
 223 }
 224
 225 void
 226 interface_remove_link(struct interface *iface, struct device *dev)
 227 {
 228         struct device *mdev = iface->main_dev.dev;
 229
 230         if (mdev && mdev->hotplug_ops) {
 231                 mdev->hotplug_ops->del(mdev, dev);
 232                 return;
 233         }
 234
 235         remove_device_user(&iface->main_dev);
 236 }
 237
 238 int
 239 interface_add_link(struct interface *iface, struct device *dev)
 240 {
 241         struct device *mdev = iface->main_dev.dev;
 242
 243         if (mdev && mdev->hotplug_ops)
 244                 return mdev->hotplug_ops->add(mdev, dev);
 245
 246         if (iface->main_dev.dev)
 247                 interface_remove_link(iface, NULL);
 248
 249         add_device_user(&iface->main_dev, dev);
 250
 251         return 0;
 252 }
 253
 254 int
 255 set_interface_up(struct interface *iface)
 256 {
 257         iface->autostart = true;
 258
 259         if (!iface->active) {
 260                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 261                 return -1;
 262         }
 263
 264         if (iface->state != IFS_DOWN)
 265                 return 0;
 266
 267         return __set_interface_up(iface);
 268 }
 269
 270 int
 271 set_interface_down(struct interface *iface)
 272 {
 273         iface->autostart = false;
 274         __set_interface_down(iface, false);
 275
 276         return 0;
 277 }
 278
 279 void
 280 start_pending_interfaces(void)
 281 {
 282         struct interface *iface;
 283
 284         list_for_each_entry(iface, &interfaces, list) {
 285                 if (iface->active && iface->autostart)
 286                         set_interface_up(iface);
 287         }
 288 }