DSCP Chain¶
This module contains the DSCPChain flow analysis chain which can be used by PATHspider’s Observer for recording Differentiated Services [RFC2474] details.
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class
pathspider.chains.dscp.
DSCPChain
[source]¶ This flow analysis chain records details of the Differentiated Services Field in the IP header.
Field Name
Type
Meaning
dscp_mark_syn_fwd
int
The value of the Differentiated Services codepoint seen on a TCP SYN packet in the forward direction
dscp_mark_data_fwd
int
The value of the Differentiated Services codepoint seen on a non-TCP packet or a TCP packet with a payload in the forward direction
dscp_mark_syn_rev
int
The value of the Differentiated Services codepoint seen on a TCP SYN packet in the reverse direction
dscp_mark_data_rev
int
The value of the Differentiated Services codepoint seen on a non-TCP packet or a TCP packet with a payload in the reverse direction
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ip4
(rec, ip, rev)[source]¶ Records DSCP markings from an IPv4 header.
- DSCP Marking
For the first TCP SYN packet and the first non-TCP packet or TCP packet with a payload, the DSCP value will be recorded in the relevant field.
- Parameters
rec (dict) – the flow record
ip (plt.ip) – the IPv4 packet that was observed to be part of this flow
rev (bool) – True if the packet was in the reverse direction, False if in the forward direction
- Returns
Always
True
- Return type
bool
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ip6
(rec, ip, rev)[source]¶ Records DSCP markings from an IPv6 header.
- DSCP Marking
For the first TCP SYN packet and the first non-TCP packet or TCP packet with a payload, the DSCP value will be recorded in the relevant field.
- Parameters
rec (dict) – the flow record
ip (plt.ip6) – the IPv6 packet that was observed to be part of this flow
rev (bool) – True if the packet was in the reverse direction, False if in the forward direction
- Returns
Always
True
- Return type
bool
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