net: move somaxconn init from sysctl code

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The default value for somaxconn is set in sysctl_core_net_init(), but this
function is not called when kernel is configured without CONFIG_SYSCTL.

This results in the kernel not being able to accept TCP connections,
because the backlog has zero size. Usually, the user ends up with:
"TCP: request_sock_TCP: Possible SYN flooding on port 7. Dropping request.  Check SNMP counters."
If SYN cookies are not enabled the connection is rejected.

Before ef547f2ac1 (tcp: remove max_qlen_log), the effects were less
severe, because the backlog was always at least eight slots long.

Signed-off-by: Roman Kapl <roman.kapl@sysgo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Roman Kapl 2017-05-24 10:22:22 +02:00 • committed by David S. Miller

parent 65d786c21b

commit 7c3f1875c6

2 changed files with 19 additions and 2 deletions

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19

net/core/net_namespace.c

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2

net/core/sysctl_net_core.c

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