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Implement 'vlanid' operator #246

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dpino opened this issue Dec 14, 2015 · 0 comments
Open

Implement 'vlanid' operator #246

dpino opened this issue Dec 14, 2015 · 0 comments

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@dpino
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dpino commented Dec 14, 2015

This PR implements a simple operator which can match a VLAN tag. Pflan 'vlan' handles VLAN hierarchies incrementing filter offsets by 4 on each use [1]

The proposed 'vlanid' operator does a simple matching of a 802.1q packet by VLAN_ID.

| dst.mac | src.mac | 0x8100 | PCP/DEI/VLAN_ID |

Where VLAN_ID = 12-bit number [0-4095].

[1] http://biot.com/capstats/bpf.html
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