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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/>.
*/
/* Loopback devices module */
#include <netif/hurdloopif.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <string.h>
#include <lwip-util.h>
/* Set the device flags */
static error_t
hurdloopif_device_set_flags (struct netif *netif, uint16_t flags)
{
error_t err = 0;
hurdloopif *loopif;
loopif = netif_get_state (netif);
loopif->flags = flags;
return err;
}
/*
* Update the interface's MTU
*/
static error_t
hurdloopif_device_update_mtu (struct netif *netif, uint32_t mtu)
{
error_t err = 0;
netif->mtu = mtu;
return err;
}
/*
* Release all resources of this netif.
*
* Returns 0 on success.
*/
static error_t
hurdloopif_device_terminate (struct netif *netif)
{
/* Free the hook */
free (netif_get_state (netif)->devname);
free (netif_get_state (netif));
return 0;
}
/*
* Set up the LwIP loopback interface
*/
error_t
hurdloopif_device_init (struct netif * netif)
{
error_t err = 0;
hurdloopif *loopif;
/*
* Replace the hook by a new one with the proper size.
* The old one is in the stack and will be removed soon.
*/
loopif = calloc (1, sizeof (hurdloopif));
if (loopif == NULL)
{
LWIP_DEBUGF (NETIF_DEBUG, ("hurdloopif_init: out of memory\n"));
return ERR_MEM;
}
memcpy (loopif, netif_get_state (netif), sizeof (struct ifcommon));
netif->state = loopif;
/* Device name and type */
loopif->devname = LOOP_DEV_NAME;
loopif->type = ARPHRD_LOOPBACK;
/* MTU = MSS + IP header + TCP header */
netif->mtu = TCP_MSS + 20 + 20;
/* Set flags */
hurdloopif_device_set_flags (netif, IFF_UP | IFF_RUNNING | IFF_LOOPBACK);
/* Set callbacks */
loopif->open = 0;
loopif->close = 0;
loopif->terminate = hurdloopif_device_terminate;
loopif->update_mtu = hurdloopif_device_update_mtu;
loopif->change_flags = hurdloopif_device_set_flags;
return err;
}
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