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Eric Dumazet aa4e78abe5 BACKPORT: tcp: add tcp_min_snd_mss sysctl 
commit 5f3e2bf008c2221478101ee72f5cb4654b9fc363 upstream.

Some TCP peers announce a very small MSS option in their SYN and/or
SYN/ACK messages.

This forces the stack to send packets with a very high network/cpu
overhead.

Linux has enforced a minimal value of 48. Since this value includes
the size of TCP options, and that the options can consume up to 40
bytes, this means that each segment can include only 8 bytes of payload.

In some cases, it can be useful to increase the minimal value
to a saner value.

We still let the default to 48 (TCP_MIN_SND_MSS), for compatibility
reasons.

Note that TCP_MAXSEG socket option enforces a minimal value
of (TCP_MIN_MSS). David Miller increased this minimal value
in commit c39508d6f1 ("tcp: Make TCP_MAXSEG minimum more correct.")
from 64 to 88.

We might in the future merge TCP_MIN_SND_MSS and TCP_MIN_MSS.

CVE-2019-11479 -- tcp mss hardcoded to 48

Signed-off-by: Eric Dumazet <edumazet@google.com>
Suggested-by: Jonathan Looney <jtl@netflix.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Tyler Hicks <tyhicks@canonical.com>
Cc: Bruce Curtis <brucec@netflix.com>
Cc: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[BACKPORT to 3.10: use previous sysctrl method]
Signed-off-by: syphyr@gmail.com
 		2019-07-27 22:11:10 +02:00
..
acpi
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asm-generic asm-generic: Fix local variable shadow in __set_fixmap_offset 2019-07-27 22:08:56 +02:00
clocksource
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crypto crypto: authenc - Export key parsing helper function 2019-07-27 21:53:36 +02:00
drm treewide: Fix typo in Documentation/DocBook 2019-07-27 22:10:20 +02:00
dt-bindings
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keys KEYS: user: Align the payload buffer 2019-07-27 22:10:23 +02:00
kvm
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linux tcp: limit payload size of sacked skbs 2019-07-27 22:11:09 +02:00
math-emu
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media media: v4l: event: Prevent freeing event subscriptions while accessed 2019-07-27 21:51:55 +02:00
memory
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misc
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net BACKPORT: tcp: add tcp_min_snd_mss sysctl 2019-07-27 22:11:10 +02:00
pcmcia
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ras
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rdma RDMA/core: Fix incorrect structure packing for booleans 2019-07-27 21:43:09 +02:00
rxrpc
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scsi scsi: libsas: align sata_device's rps_resp on a cacheline 2019-07-27 21:46:11 +02:00
sdp
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soc/qcom qseecom: Add a new smc cmd to check RPMB key provision status 2019-07-27 22:10:55 +02:00
sound lsm: check payload size validity before using it as array index 2019-07-27 22:10:55 +02:00
target target: Avoid mappedlun symlink creation during lun shutdown 2019-07-27 21:44:16 +02:00
trace Revert "lowmemorykiller: adapt to vmpressure" 2019-07-27 22:09:44 +02:00
uapi tcp: tcp_fragment() should apply sane memory limits 2019-07-27 22:11:09 +02:00
video
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xen
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Kbuild
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