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Differential D21666

Let the RACK stack take IP options into account when computing the space for user data in TCP segments
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Authored by tuexen on Sep 15 2019, 5:53 PM.

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rS352673: MFC r352512:
rS352512: When the RACK stack computes the space for user data in a TCP segment,

Summary

When the RACK stack computes the space for user data in a TCP segment, it wasn't taking the IP level options into account. This patch fixes this. It also corrects a KASSERT and adds the protection code missing also from the default stack and to be added in D21665 .
Without this fix, IP level fragmentation would occur.

Test Plan

Check with the following test program that no IP level fragmentation occurs (use RACK as the default stack):

connect-with-dst-opt.c917 BDownload

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rS FreeBSD src repository - subversion

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Event Timeline

tuexen created this revision.Sep 15 2019, 5:53 PM

Herald added a reviewer: transport. · View Herald TranscriptSep 15 2019, 5:53 PM

Herald added a subscriber: imp. · View Herald Transcript

Harbormaster completed remote builds in B26509: Diff 62129.Sep 15 2019, 5:53 PM

rrs accepted this revision.Sep 17 2019, 12:48 PM

This revision is now accepted and ready to land.Sep 17 2019, 12:48 PM

Closed by commit rS352512: When the RACK stack computes the space for user data in a TCP segment, (authored by tuexen). · Explain WhySep 19 2019, 10:28 AM

This revision was automatically updated to reflect the committed changes.

tuexen added a commit: rS352512: When the RACK stack computes the space for user data in a TCP segment,.

tuexen added a commit: rS352673: MFC r352512:.Sep 25 2019, 10:41 AM

tuexen mentioned this in rS353040: MFS r352673:.Oct 3 2019, 12:27 PM

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head/

sys/

netinet/

tcp_stacks/

35 lines

Diff 62304

head/sys/netinet/tcp_stacks/rack.c

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