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authorVlad Yasevich <vladislav.yasevich@hp.com>2009-08-26 09:36:25 -0400
committerVlad Yasevich <vladislav.yasevich@hp.com>2009-09-04 18:20:58 -0400
commitb9f8478682445c2a3e0b87718a0563ef543ad94e (patch)
tree9bc0351c0a329a0780c6f2f7291e9207727de686 /net/sctp/transport.c
parentd71a09ed555e52299b5d3ad8945bdf84f65423a6 (diff)
sctp: Fix error count increments that were results of HEARTBEATS
SCTP RFC 4960 states that unacknowledged HEARTBEATS count as errors agains a given transport or endpoint. As such, we should increment the error counts for only for unacknowledged HB, otherwise we detect failure too soon. This goes for both the overall error count and the path error count. Now, there is a difference in how the detection is done between the two. The path error detection is done after the increment, so to detect it properly, we actually need to exceed the path threshold. The overall error detection is done _BEFORE_ the increment. Thus to detect the failure, it's enough for the error count to match the threshold. This is why all the state functions use '>=' to detect failure, while path detection uses '>'. Thanks goes to Chunbo Luo <chunbo.luo@windriver.com> who first proposed patches to fix this issue and made me re-read the spec and the code to figure out how this cruft really works. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Diffstat (limited to 'net/sctp/transport.c')
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