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;
  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         release_device(iface->main_dev.dev);
  68         iface->state = IFS_DOWN;
  69 }
  70
  71 static int
  72 __set_interface_up(struct interface *iface)
  73 {
  74         int ret;
  75
  76         if (iface->state != IFS_DOWN)
  77                 return 0;
  78
  79         ret = claim_device(iface->main_dev.dev);
  80         if (ret)
  81                 return ret;
  82
  83         iface->state = IFS_SETUP;
  84         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
  85         if (ret) {
  86                 mark_interface_down(iface);
  87                 return ret;
  88         }
  89
  90         return 0;
  91
  92 }
  93
  94 static void
  95 __set_interface_down(struct interface *iface, bool force)
  96 {
  97         clear_interface_errors(iface);
  98
  99         if (iface->state == IFS_DOWN ||
 100                 iface->state == IFS_TEARDOWN)
 101                 return;
 102
 103         iface->state = IFS_TEARDOWN;
 104         interface_event(iface, IFEV_DOWN);
 105
 106         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 107         release_device(iface->main_dev.dev);
 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)
 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)
 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
 189         interface_set_proto_state(iface, get_default_proto());
 190         if (!iface->proto) {
 191                 free(iface);
 192                 return NULL;
 193         }
 194
 195         iface->main_dev.cb = interface_cb;
 196         iface->l3_iface = &iface->main_dev;
 197         strncpy(iface->name, name, sizeof(iface->name) - 1);
 198         list_add(&iface->list, &interfaces);
 199         INIT_LIST_HEAD(&iface->errors);
 200
 201         netifd_ubus_add_interface(iface);
 202
 203         return iface;
 204 }
 205
 206 void
 207 free_interface(struct interface *iface)
 208 {
 209         netifd_ubus_remove_interface(iface);
 210         list_del(&iface->list);
 211         if (iface->proto->free)
 212                 iface->proto->free(iface->proto);
 213         free(iface);
 214 }
 215
 216 struct interface *
 217 get_interface(const char *name)
 218 {
 219         struct interface *iface;
 220
 221         list_for_each_entry(iface, &interfaces, list) {
 222                 if (!strcmp(iface->name, name))
 223                         return iface;
 224         }
 225         return NULL;
 226 }
 227
 228 void
 229 interface_remove_link(struct interface *iface, struct device *dev)
 230 {
 231         struct device *mdev = iface->main_dev.dev;
 232
 233         if (mdev && mdev->hotplug_ops) {
 234                 mdev->hotplug_ops->del(mdev, dev);
 235                 return;
 236         }
 237
 238         remove_device_user(&iface->main_dev);
 239 }
 240
 241 int
 242 interface_add_link(struct interface *iface, struct device *dev)
 243 {
 244         struct device *mdev = iface->main_dev.dev;
 245
 246         if (mdev && mdev->hotplug_ops)
 247                 return mdev->hotplug_ops->add(mdev, dev);
 248
 249         if (iface->main_dev.dev)
 250                 interface_remove_link(iface, NULL);
 251
 252         add_device_user(&iface->main_dev, dev);
 253
 254         return 0;
 255 }
 256
 257 int
 258 set_interface_up(struct interface *iface)
 259 {
 260         iface->autostart = true;
 261
 262         if (!iface->active) {
 263                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 264                 return -1;
 265         }
 266
 267         if (iface->state != IFS_DOWN)
 268                 return 0;
 269
 270         return __set_interface_up(iface);
 271 }
 272
 273 int
 274 set_interface_down(struct interface *iface)
 275 {
 276         iface->autostart = false;
 277         __set_interface_down(iface, false);
 278
 279         return 0;
 280 }