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41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* Copyright (C) 2018 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <stddef.h>
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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#define LINUX_VERSION_CODE 263682
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int SEC("filter") hashfilter(struct __sk_buff *skb) {
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__u16 vlan_id = skb->vlan_tci & 0x0fff;
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/* accept VLAN 2 and 4 and drop the rest */
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switch (vlan_id) {
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case 2:
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case 4:
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return -1;
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default:
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return 0;
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}
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return 0;
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}
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char __license[] SEC("license") = "GPL";
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__u32 __version SEC("version") = LINUX_VERSION_CODE;
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