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 }
 108
 109 static void
 110 interface_cb(struct device_user *dep, enum device_event ev)
 111 {
 112         struct interface *iface;
 113         bool new_state;
 114
 115         iface = container_of(dep, struct interface, main_dev);
 116         switch (ev) {
 117         case DEV_EVENT_ADD:
 118                 new_state = true;
 119                 break;
 120         case DEV_EVENT_REMOVE:
 121                 new_state = false;
 122                 break;
 123         default:
 124                 return;
 125         }
 126
 127         if (iface->active == new_state)
 128                 return;
 129
 130         iface->active = new_state;
 131
 132         if (new_state) {
 133                 if (iface->autostart)
 134                         set_interface_up(iface);
 135         } else
 136                 __set_interface_down(iface, true);
 137 }
 138
 139 static void
 140 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 141 {
 142         struct interface *iface = state->iface;
 143
 144         switch (ev) {
 145         case IFPEV_UP:
 146                 if (iface->state != IFS_SETUP)
 147                         return;
 148
 149                 iface->state = IFS_UP;
 150                 interface_event(iface, IFEV_UP);
 151                 break;
 152         case IFPEV_DOWN:
 153                 if (iface->state == IFS_DOWN)
 154                         return;
 155
 156                 mark_interface_down(iface);
 157                 break;
 158         }
 159 }
 160
 161 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 162 {
 163         if (iface->proto) {
 164                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
 165                 iface->proto->free(iface->proto);
 166                 iface->proto = NULL;
 167         }
 168         iface->state = IFS_DOWN;
 169         iface->proto = state;
 170         if (!state)
 171                 return;
 172
 173         state->proto_event = interface_proto_cb;
 174         state->iface = iface;
 175 }
 176
 177 struct interface *
 178 alloc_interface(const char *name)
 179 {
 180         struct interface *iface;
 181
 182         iface = get_interface(name);
 183         if (iface)
 184                 return iface;
 185
 186         iface = calloc(1, sizeof(*iface));
 187
 188         interface_set_proto_state(iface, get_default_proto());
 189         if (!iface->proto) {
 190                 free(iface);
 191                 return NULL;
 192         }
 193
 194         iface->main_dev.cb = interface_cb;
 195         iface->l3_iface = &iface->main_dev;
 196         strncpy(iface->name, name, sizeof(iface->name) - 1);
 197         list_add(&iface->list, &interfaces);
 198         INIT_LIST_HEAD(&iface->errors);
 199
 200         netifd_ubus_add_interface(iface);
 201
 202         return iface;
 203 }
 204
 205 void
 206 free_interface(struct interface *iface)
 207 {
 208         netifd_ubus_remove_interface(iface);
 209         list_del(&iface->list);
 210         if (iface->proto->free)
 211                 iface->proto->free(iface->proto);
 212         free(iface);
 213 }
 214
 215 struct interface *
 216 get_interface(const char *name)
 217 {
 218         struct interface *iface;
 219
 220         list_for_each_entry(iface, &interfaces, list) {
 221                 if (!strcmp(iface->name, name))
 222                         return iface;
 223         }
 224         return NULL;
 225 }
 226
 227 void
 228 interface_remove_link(struct interface *iface, struct device *dev)
 229 {
 230         struct device *mdev = iface->main_dev.dev;
 231
 232         if (mdev && mdev->hotplug_ops) {
 233                 mdev->hotplug_ops->del(mdev, dev);
 234                 return;
 235         }
 236
 237         remove_device_user(&iface->main_dev);
 238 }
 239
 240 int
 241 interface_add_link(struct interface *iface, struct device *dev)
 242 {
 243         struct device *mdev = iface->main_dev.dev;
 244
 245         if (mdev && mdev->hotplug_ops)
 246                 return mdev->hotplug_ops->add(mdev, dev);
 247
 248         if (iface->main_dev.dev)
 249                 interface_remove_link(iface, NULL);
 250
 251         add_device_user(&iface->main_dev, dev);
 252
 253         return 0;
 254 }
 255
 256 int
 257 set_interface_up(struct interface *iface)
 258 {
 259         iface->autostart = true;
 260
 261         if (!iface->active) {
 262                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 263                 return -1;
 264         }
 265
 266         if (iface->state != IFS_DOWN)
 267                 return 0;
 268
 269         return __set_interface_up(iface);
 270 }
 271
 272 int
 273 set_interface_down(struct interface *iface)
 274 {
 275         iface->autostart = false;
 276         __set_interface_down(iface, false);
 277
 278         return 0;
 279 }