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/*
Copyright (C) 2017 Free Software Foundation, Inc.
Written by Joan Lledó.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd. If not, see <http://www.gnu.org/licenses/>.
*/
/* Common interface for all kinds of devices */
#include <netif/ifcommon.h>
#include <net/if.h>
#include <errno.h>
#include <lwip/tcpip.h>
/* Open the device and set the interface up */
static error_t
if_open (struct netif *netif)
{
error_t err = 0;
struct ifcommon *ifc = netif_get_state (netif);
if (ifc->open)
err = ifc->open (netif);
if (!err)
{
/* Up the inerface */
ifc->flags |= IFF_UP | IFF_RUNNING;
netif_set_up (netif);
}
return err;
}
/* Close the device and set the interface down */
static error_t
if_close (struct netif *netif)
{
error_t err = 0;
struct ifcommon *ifc = netif_get_state (netif);
if (ifc->close)
err = ifc->close (netif);
if (!err)
{
/* Down the inerface */
ifc->flags &= ~(IFF_UP | IFF_RUNNING);
netif_set_down (netif);
}
return err;
}
/*
* Common initialization callback for all kinds of devices.
*
* This function doesn't assume there's a device nor tries to open it.
* If a device is present, it must be opened from the ifc->init() callback.
*/
err_t
if_init (struct netif *netif)
{
struct ifcommon *ifc = netif_get_state (netif);
if (ifc == NULL)
/* The user provided no interface */
return -1;
return ifc->init (netif);
}
/* Tries to close the device and frees allocated resources */
error_t
if_terminate (struct netif * netif)
{
error_t err;
struct ifcommon *ifc = netif_get_state (netif);
if (ifc == NULL)
/* The user provided no interface */
return -1;
err = if_close (netif);
if (err)
return err;
return ifc->terminate (netif);
}
/* Args for _if_change_flags() */
struct if_change_flags_args
{
struct netif *netif;
uint16_t flags;
error_t err;
};
/*
* Implementation of if_change_flags(), called inside a thread-safe context
*/
static void
_if_change_flags (void *arg)
{
error_t err;
struct ifcommon *ifc;
uint16_t oldflags;
struct if_change_flags_args *args = arg;
ifc = netif_get_state (args->netif);
if (ifc == NULL)
{
/* The user provided no interface */
errno = EINVAL;
return;
}
oldflags = ifc->flags;
err = ifc->change_flags (args->netif, args->flags);
if (!err && ((oldflags ^ args->flags) & IFF_UP)) /* Bit is different ? */
err = ((oldflags & IFF_UP) ? if_close : if_open) (args->netif);
args->err = err;
return;
}
/*
* Change device flags.
*
* If IFF_UP changes, it opens/closes the device accordingly.
*/
error_t
if_change_flags (struct netif * netif, uint16_t flags)
{
error_t err;
/*
* Call _if_change_flags() inside the tcpip_thread and wait for it to finish.
*/
struct if_change_flags_args *args =
calloc (1, sizeof (struct if_change_flags_args));
args->netif = netif;
args->flags = flags;
err = tcpip_callback_wait(_if_change_flags, args);
if(!err)
/* Get the return value */
err = args->err;
free (args);
return err;
}
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