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/* Copyright (C) 2018 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <stddef.h>
#include <linux/bpf.h>
#include "bpf_helpers.h"
#define LINUX_VERSION_CODE 263682
int SEC("filter") hashfilter(struct __sk_buff *skb) {
__u16 vlan_id = skb->vlan_tci & 0x0fff;
/* accept VLAN 2 and 4 and drop the rest */
switch (vlan_id) {
case 2:
case 4:
return -1;
default:
return 0;
}
return 0;
}
char __license[] SEC("license") = "GPL";
__u32 __version SEC("version") = LINUX_VERSION_CODE;
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