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29 July 2024, 15:18:00 UTC
Revision 22e83a2926998fe132ae4dd26f1e998c70ae2e38 authored by Henry Wong on 18 September 2011, 13:41:49 UTC, committed by David S. Miller on 20 September 2011, 19:20:58 UTC 
ppp_generic: fix multilink fragment MTU calculation (again)
 
When using MLPPP, the maximum size of a fragment is incorrectly
calculated with an offset of -2.
This patch reverses the changes in the patch found here:
http://marc.info/?l=linux-netdev&m=123541324010539&w=2

The value of hdrlen includes the size of both the 2-byte PPP protocol
field and the 2- or 4-byte multilink header (2+4=6 for long sequence
numbers, 2+2=4 for short sequence numbers). Section 2 of RFC1661 says
that the MRU that is negotiated (i.e., the MTU of the sending system)
includes only the PPP payload but not the protocol field, thus the
correct MTU should be the link's MTU minus the multilink header (mtu -
(hdrlen-2)).

The incorrect calculation causes Linux to fragment packets to a size two
bytes smaller than the allowed MTU. While not technically illegal, this
behaviour confounds MRU-tuning to avoid PPP-layer fragmentation.

Signed-off-by: Henry Wong <henry@stuffedcow.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent d706f00
History
Tip revision: 22e83a2926998fe132ae4dd26f1e998c70ae2e38 authored by Henry Wong on 18 September 2011, 13:41:49 UTC
ppp_generic: fix multilink fragment MTU calculation (again)
Tip revision: 22e83a2
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