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Message-Id: <20230215135318.8899-1-paolo.lungaroni@uniroma2.it>
Date: Wed, 15 Feb 2023 14:53:18 +0100
From: Paolo Lungaroni <paolo.lungaroni@...roma2.it>
To: David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
Stephen Hemminger <stephen@...workplumber.org>,
Stefano Salsano <stefano.salsano@...roma2.it>,
Ahmed Abdelsalam <ahabdels.dev@...il.com>,
Andrea Mayer <andrea.mayer@...roma2.it>,
Paolo Lungaroni <paolo.lungaroni@...roma2.it>
Subject: [iproute2-next] seg6: man: ip-link.8: add SRv6 End PSP flavor description
This patch extends the manpage by providing a brief description of the PSP
flavor for the SRv6 End behavior as defined in RFC 8986 [1].
The code/logic required to handle the "flavors" framework has already been
merged into iproute2 by commit:
04a6b456bf74 ("seg6: add support for flavors in SRv6 End* behaviors").
Some examples:
ip -6 route add 2001:db8::1 encap seg6local action End flavors psp dev eth0
Standard Output:
ip -6 route show 2001:db8::1
2001:db8::1 encap seg6local action End flavors psp dev eth0 metric 1024 pref medium
JSON Output:
ip -6 -j -p route show 2001:db8::1
[ {
"dst": "2001:db8::1",
"encap": "seg6local",
"action": "End",
"flavors": [ "psp" ],
"dev": "eth0",
"metric": 1024,
"flags": [ ],
"pref": "medium"
} ]
[1] - https://datatracker.ietf.org/doc/html/rfc8986
Signed-off-by: Paolo Lungaroni <paolo.lungaroni@...roma2.it>
---
man/man8/ip-route.8.in | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in
index 194dc780..c2b00833 100644
--- a/man/man8/ip-route.8.in
+++ b/man/man8/ip-route.8.in
@@ -963,7 +963,12 @@ subset of the existing behaviors.
.in -2
.B psp
-- Penultimate Segment Pop of the SRH (not yet supported in kernel)
+- The Penultimate Segment Pop (PSP) copies the last SID from the SID List
+(carried by the outermost SRH) into the IPv6 Destination Address (DA) and
+removes (i.e. pops) the SRH from the IPv6 header.
+The PSP operation takes place only at a penultimate SR Segment Endpoint node
+(e.g., the Segment Left must be one) and does not happen at non-penultimate
+endpoint nodes.
.B usp
- Ultimate Segment Pop of the SRH (not yet supported in kernel)
@@ -1359,6 +1364,11 @@ ip -6 route add 2001:db8:1::/64 encap seg6local action End.DT46 vrftable 100 dev
Adds an IPv6 route with SRv6 decapsulation and forward with lookup in VRF table.
.RE
.PP
+ip -6 route add 2001:db8:1::/64 encap seg6local action End flavors psp dev eth0
+.RS 4
+Adds an IPv6 route with SRv6 End behavior with psp flavor enabled.
+.RE
+.PP
ip -6 route add 2001:db8:1::/64 encap seg6local action End flavors next-csid dev eth0
.RS 4
Adds an IPv6 route with SRv6 End behavior with next-csid flavor enabled.
--
2.20.1
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