Am 22.02.22 um 15:35 schrieb Gert Doering:
Commit 4225114b96 repaired "--mtu-disc yes" brokenness for IPv4 UDP sockets
(caused by autoconf/ifdef issues). This patch adds new functionality
to do --mtu-disc for IPv6 sockets as well.
Half of it (setsockopt(IPV6_MTU_DISCOVER)) was already there, but
receiving of detailed socket errors was missing the enablement of
setsockopt(IPV6_RECVERR) and parsing of IPPROTO_IPV6/IPV6_RECVERR
messages received.
With that, we now get (sending over a route with "mtu 1300"):
2022-02-22 15:28:07 write UDPv6 [EMSGSIZE Path-MTU=1300]: Message too long
(fd=3,code=90)
2022-02-22 15:28:07 Note adjusting 'mssfix 1400 mtu' to 'mssfix 1300 mtu'
according to path MTU discovery
2022-02-22 15:28:07 Note adjusting 'fragment 1400 mtu' to 'fragment 1300 mtu'
according to path MTU discovery
Looks simple enough.
Acked-By: Arne Schwabe <a...@rfc2549.org>
Arne
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