[XFRM]: Optimize MTU calculation

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Replace the probing based MTU estimation, which usually takes 2-3 iterations
to find a fitting value and may underestimate the MTU, by an exact calculation.

Also fix underestimation of the XFRM trailer_len, which causes unnecessary
reallocations.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Patrick McHardy 2007-04-09 11:47:18 -07:00 • committed by David S. Miller

parent 557922584d

commit c5c2523893

4 changed files with 39 additions and 51 deletions

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2

include/net/xfrm.h

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30

net/ipv4/esp4.c

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22

net/ipv6/esp6.c

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36

net/xfrm/xfrm_state.c

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