From 444ac7bee1452cdf59ec44400db210423052d109 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Wed, 5 Jul 2017 00:54:27 +0200
Subject: rt: add path mtu support

Only use case is to allow similar behaviour to iptables
TCPMSS --clamp-mss-to-pmtu, by combining this with exthdr statement:

tcp option maxseg size set rt mtu

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 doc/nft.xml | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'doc')

diff --git a/doc/nft.xml b/doc/nft.xml
index d3213d02..4e2730f6 100644
--- a/doc/nft.xml
+++ b/doc/nft.xml
@@ -2836,6 +2836,11 @@ filter prerouting meta mark set 0xdead fib daddr . mark type vmap { blackhole :
 								<entry>Routing nexthop</entry>
 								<entry>ipv4_addr/ipv6_addr</entry>
 							</row>
+							<row>
+								<entry>mtu</entry>
+								<entry>TCP maximum segment size of route</entry>
+								<entry>integer (16 bit)</entry>
+							</row>
 						</tbody>
 					</tgroup>
 				</table>
@@ -4270,6 +4275,8 @@ ip forward ip dscp set 42
 					<title>change tcp mss</title>
 					<programlisting>
 tcp option maxseg size set 1360
+# set a size based on route information:
+tcp option maxseg size set rt mtu
 					</programlisting>
 				</example>
 			</para>
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