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Update inet6.py for Destination Option #4695

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Update inet6.py for Destination Option #4695

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ed5fd3e
Update inet6.py for Destination Option
arnavdas88 Mar 16, 2025
a49980c
Apply suggestions from code review
guedou Feb 14, 2026
5b420bf
Add tests for IPv6 with Destination Option header (hashret/answers)
guedou Feb 14, 2026
58af5c3
Fix flake8 errors: trailing whitespace and inline comment formatting
guedou Feb 14, 2026
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15 changes: 14 additions & 1 deletion scapy/layers/inet6.py
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Original file line number Diff line number Diff line change
Expand Up @@ -481,7 +481,20 @@ def answers(self, other):
elif other.nh == 43 and isinstance(other.payload, IPv6ExtHdrSegmentRouting): # noqa: E501
return self.payload.answers(other.payload.payload) # Buggy if self.payload is a IPv6ExtHdrRouting # noqa: E501
elif other.nh == 60 and isinstance(other.payload, IPv6ExtHdrDestOpt):
return self.payload.answers(other.payload.payload)
# Extension Headers can show weird behavior.
# Linux's sk_buff considers the IPv6 Payload
# to be either TCP, UDP or ICMP. It does not
# consider Extension Headers to be the payload.
# Following similar architecture, this small
# modification lets packet flow with Destination
# Option on both, request and response packets
# be captured as well.
if UDP in self and UDP in other:
return self[UDP].answers(other[UDP])
elif TCP in self and TCP in other:
return self[TCP].answers(other[TCP])
else:
return self.payload.answers(other.payload.payload)
elif self.nh == 60 and isinstance(self.payload, IPv6ExtHdrDestOpt): # BU in reply to BRR, for instance # noqa: E501
return self.payload.payload.answers(other.payload)
else:
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12 changes: 12 additions & 0 deletions test/scapy/layers/inet6.uts
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Original file line number Diff line number Diff line change
Expand Up @@ -461,6 +461,18 @@ a = IPv6(b'`\x00\x00\x00\x00\x10<\xff\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x00\x0
assert a.hashret() == b.hashret()
assert b.answers(a)

= IPv6 with DestOpt and UDP
a = IPv6(raw(IPv6(src="2001:db8::1", dst="2001:db8::2")/IPv6ExtHdrDestOpt()/UDP(sport=12345, dport=53)))
b = IPv6(raw(IPv6(src="2001:db8::2", dst="2001:db8::1")/IPv6ExtHdrDestOpt()/UDP(sport=53, dport=12345)))
assert a.hashret() == b.hashret()
assert b.answers(a)

= IPv6 with DestOpt and TCP
a = IPv6(raw(IPv6(src="2001:db8::1", dst="2001:db8::2")/IPv6ExtHdrDestOpt()/TCP(sport=12345, dport=80, flags="S", seq=1000)))
b = IPv6(raw(IPv6(src="2001:db8::2", dst="2001:db8::1")/IPv6ExtHdrDestOpt()/TCP(sport=80, dport=12345, flags="SA", seq=2000, ack=1001)))
assert a.hashret() == b.hashret()
assert b.answers(a)

= ICMPv6EchoRequest and ICMPv6EchoReply - answers() test 8 - (live) use Net6
~ netaccess ipv6

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