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/*
* hostapd / VLAN netlink api
* Copyright (c) 2012, Michael Braun <michael-dev@fami-braun.de>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include <sys/ioctl.h>
#include <linux/sockios.h>
#include <linux/if_vlan.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netlink/route/link.h>
#include <netlink/route/link/vlan.h>
#include "utils/common.h"
#include "utils/eloop.h"
#include "hostapd.h"
#include "vlan_util.h"
/*
* Add a vlan interface with name 'vlan_if_name', VLAN ID 'vid' and
* tagged interface 'if_name'.
*
* returns -1 on error
* returns 1 if the interface already exists
* returns 0 otherwise
*/
int vlan_add(const char *if_name, int vid, const char *vlan_if_name)
{
int ret = -1;
struct nl_sock *handle = NULL;
struct nl_cache *cache = NULL;
struct rtnl_link *rlink = NULL;
int if_idx = 0;
wpa_printf(MSG_DEBUG, "VLAN: vlan_add(if_name=%s, vid=%d, "
"vlan_if_name=%s)", if_name, vid, vlan_if_name);
if ((os_strlen(if_name) + 1) > IFNAMSIZ) {
wpa_printf(MSG_ERROR, "VLAN: Interface name too long: '%s'",
if_name);
return -1;
}
if ((os_strlen(vlan_if_name) + 1) > IFNAMSIZ) {
wpa_printf(MSG_ERROR, "VLAN: Interface name too long: '%s'",
vlan_if_name);
return -1;
}
handle = nl_socket_alloc();
if (!handle) {
wpa_printf(MSG_ERROR, "VLAN: failed to open netlink socket");
goto vlan_add_error;
}
if (nl_connect(handle, NETLINK_ROUTE) < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to connect to netlink");
goto vlan_add_error;
}
if (rtnl_link_alloc_cache(handle, AF_UNSPEC, &cache) < 0) {
cache = NULL;
wpa_printf(MSG_ERROR, "VLAN: failed to alloc cache");
goto vlan_add_error;
}
if (!(if_idx = rtnl_link_name2i(cache, if_name))) {
/* link does not exist */
wpa_printf(MSG_ERROR, "VLAN: interface %s does not exist",
if_name);
goto vlan_add_error;
}
if ((rlink = rtnl_link_get_by_name(cache, vlan_if_name))) {
/* link does exist */
rtnl_link_put(rlink);
rlink = NULL;
wpa_printf(MSG_ERROR, "VLAN: interface %s already exists",
vlan_if_name);
ret = 1;
goto vlan_add_error;
}
rlink = rtnl_link_alloc();
if (!rlink) {
wpa_printf(MSG_ERROR, "VLAN: failed to allocate new link");
goto vlan_add_error;
}
if (rtnl_link_set_type(rlink, "vlan") < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to set link type");
goto vlan_add_error;
}
rtnl_link_set_link(rlink, if_idx);
rtnl_link_set_name(rlink, vlan_if_name);
if (rtnl_link_vlan_set_id(rlink, vid) < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to set link vlan id");
goto vlan_add_error;
}
if (rtnl_link_add(handle, rlink, NLM_F_CREATE) < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to create link %s for "
"vlan %d on %s (%d)",
vlan_if_name, vid, if_name, if_idx);
goto vlan_add_error;
}
ret = 0;
vlan_add_error:
if (rlink)
rtnl_link_put(rlink);
if (cache)
nl_cache_free(cache);
if (handle)
nl_socket_free(handle);
return ret;
}
int vlan_rem(const char *if_name)
{
int ret = -1;
struct nl_sock *handle = NULL;
struct nl_cache *cache = NULL;
struct rtnl_link *rlink = NULL;
wpa_printf(MSG_DEBUG, "VLAN: vlan_rem(if_name=%s)", if_name);
handle = nl_socket_alloc();
if (!handle) {
wpa_printf(MSG_ERROR, "VLAN: failed to open netlink socket");
goto vlan_rem_error;
}
if (nl_connect(handle, NETLINK_ROUTE) < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to connect to netlink");
goto vlan_rem_error;
}
if (rtnl_link_alloc_cache(handle, AF_UNSPEC, &cache) < 0) {
cache = NULL;
wpa_printf(MSG_ERROR, "VLAN: failed to alloc cache");
goto vlan_rem_error;
}
if (!(rlink = rtnl_link_get_by_name(cache, if_name))) {
/* link does not exist */
wpa_printf(MSG_ERROR, "VLAN: interface %s does not exists",
if_name);
goto vlan_rem_error;
}
if (rtnl_link_delete(handle, rlink) < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to remove link %s",
if_name);
goto vlan_rem_error;
}
ret = 0;
vlan_rem_error:
if (rlink)
rtnl_link_put(rlink);
if (cache)
nl_cache_free(cache);
if (handle)
nl_socket_free(handle);
return ret;
}
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