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ipsec: If no PMTU in hostcache assume it's equal to link's MTU
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Authored by bag_semihalf.com on Sep 1 2021, 11:43 AM.

Details

Summary

If we fail to find to PMTU in hostcache, we assume it's equal
to link's MTU.

This patch prevents packets larger then link's MTU to be dropped
silently if there is no PMTU in hostcache.

Diff Detail

Repository
rG FreeBSD src repository
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

sys/netipsec/ipsec_output.c
356

Why can't we reuse the previous case?

sys/netipsec/ipsec_output.c
356

In my option this way is clearer what the code does. And I don’t think we should call tcp_maxmtu when we don’t need it, because it searches through the routing table.

This revision was not accepted when it landed; it landed in state Needs Review.Sep 24 2021, 8:30 AM
This revision was automatically updated to reflect the committed changes.