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Eric Dumazet 702d673e9e BACKPORT: tcp/dccp: drop SYN packets if accept queue is full 
Per listen(fd, backlog) rules, there is really no point accepting a SYN,
sending a SYNACK, and dropping the following ACK packet if accept queue
is full, because application is not draining accept queue fast enough.

This behavior is fooling TCP clients that believe they established a
flow, while there is nothing at server side. They might then send about
10 MSS (if using IW10) that will be dropped anyway while server is under
stress.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 5ea8ea2cb7)

Backport for pass Android CTS CtsLibcoreTestCases:
libcore.javax.net.ServerSocketFactoryTest#testCreateServerSocketWithPortNoBacklog

Refer the comments on libcore/luni/src/test/java/libcore/javax/net/ServerSocketFactoryTest.java
// This test may fail on kernel versions between 4.4 and 4.9, due to a kernel implementation
// detail change. Backporting the following kernel change will fix the behavior.
// http://b/31960002
// https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5ea8ea2cb7f1d0db15762c9b0bb9e7330425a071
public void testCreateServerSocketWithPortNoBacklog() throws IOException {
    ServerSocket serverSocket = ServerSocketFactory.getDefault().createServerSocket(0, 1);
    testSocket(serverSocket, 1);
}

Change-Id: I9bb3531480f4942447d8d4eded110aa31bc7c031
Signed-off-by: Tao Huang <huangtao@rock-chips.com>
2017-12-21 10:42:52 +08:00
..
acpi UPSTREAM: device property: Avoid potential dereferences of invalid pointers 2017-08-30 14:50:28 +08:00
asm-generic Merge branch 'linux-linaro-lsk-v4.4-android' of git://git.linaro.org/kernel/linux-linaro-stable.git 2017-12-01 11:04:13 +08:00
clocksource
crypto Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-04-23 12:02:14 +08:00
drm drm: bridge: dw-hdmi: introduce mpll_cfg_420 2017-12-11 15:27:58 +08:00
dt-bindings clk/rockchip: add cru support for rk618 2017-12-21 10:30:28 +08:00
keys
kvm
linux mfd: Add support for rk618 2017-12-21 10:29:40 +08:00
math-emu
media camera: rockchip: camsys_drv: v0.0x22.7 camsys_head: v0.e.0 2017-12-07 15:39:42 +08:00
memory
misc
net BACKPORT: tcp/dccp: drop SYN packets if accept queue is full 2017-12-21 10:42:52 +08:00
pcmcia
ras
rdma RDMA/core: Fix incorrect structure packing for booleans 2017-03-12 06:37:29 +01:00
rxrpc
scsi scsi: libiscsi: add lock around task lists to fix list corruption regression 2017-03-26 12:13:19 +02:00
soc drm/rockchip: Avoid multiple definition 2017-12-20 14:51:39 +08:00
sound Merge branch 'linux-linaro-lsk-v4.4-android' of git://git.linaro.org/kernel/linux-linaro-stable.git 2017-12-01 11:04:13 +08:00
target target/iscsi: Fix iSCSI task reassignment handling 2017-11-18 11:11:07 +01:00
trace Merge branch 'linux-linaro-lsk-v4.4-android' of git://git.linaro.org/kernel/linux-linaro-stable.git 2017-12-01 11:04:13 +08:00
uapi Merge branch 'linux-linaro-lsk-v4.4-android' of git://git.linaro.org/kernel/linux-linaro-stable.git 2017-12-01 11:04:13 +08:00
video
xen fix xen_swiotlb_dma_mmap prototype 2017-10-05 09:41:48 +02:00
Kbuild