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linux/net/dccp
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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
..
ccids dccp: fix memory leak during tear-down of unsuccessful connection request 2017-03-22 12:04:17 +01:00
ackvec.c dccp: drop null test before destroy functions 2015-09-15 16:49:43 -07:00
ackvec.h net: dccp: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
ccid.c dccp: drop null test before destroy functions 2015-09-15 16:49:43 -07:00
ccid.h net: dccp: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
dccp.h tcp/dccp: fix hashdance race for passive sessions 2015-10-23 05:42:21 -07:00
diag.c sock_diag: specify info_size per inet protocol 2015-06-15 19:49:22 -07:00
feat.c dccp: fix a memleak for dccp_feat_init err process 2017-08-11 09:08:54 -07:00
feat.h net: dccp: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
input.c dccp: fix freeing skb too early for IPV6_RECVPKTINFO 2017-02-26 11:07:50 +01:00
ipv4.c BACKPORT: tcp/dccp: drop SYN packets if accept queue is full 2017-12-21 10:42:52 +08:00
ipv6.c BACKPORT: tcp/dccp: drop SYN packets if accept queue is full 2017-12-21 10:42:52 +08:00
ipv6.h inet: includes a sock_common in request_sock 2013-10-10 00:08:07 -04:00
Kconfig net/dccp: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:39:34 -08:00
Makefile dccp: Policy-based packet dequeueing infrastructure 2010-12-07 13:47:12 +01:00
minisocks.c dccp: fix use-after-free in dccp_feat_activate_values 2017-03-22 12:04:15 +01:00
options.c dccp: remove obsolete code 2014-01-04 20:18:49 -05:00
output.c dccp: constify dccp_make_response() socket argument 2015-09-25 13:00:39 -07:00
probe.c Use 64-bit timekeeping 2015-11-01 17:01:16 -05:00
proto.c dccp: defer ccid_hc_tx_delete() at dismantle time 2017-08-30 10:19:18 +02:00
qpolicy.c dccp qpolicy: Parameter checking of cmsg qpolicy parameters 2010-12-07 13:47:12 +01:00
sysctl.c dccp: make the request_retries minimum is 1 2014-05-14 15:34:16 -04:00
timer.c inet: get rid of central tcp/dccp listener timer 2015-03-20 12:40:25 -04:00