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linux/net/ipv4
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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
..
netfilter netfilter: invoke synchronize_rcu after set the _hook_ to NULL 2017-10-08 10:14:19 +02:00
af_inet.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-07-11 16:22:22 +08:00
ah4.c IPsec: do not ignore crypto err in ah4 input 2017-11-15 17:13:10 +01:00
arp.c NET: Fix /proc/net/arp for AX.25 2017-06-17 06:39:35 +02:00
cipso_ipv4.c tcp/dccp: fix ireq->opt races 2017-11-18 11:11:06 +01:00
datagram.c net: Set sk_txhash from a random number 2015-07-29 22:44:04 -07:00
devinet.c Revert "net: socket ioctl to reset connections matching local address" 2016-05-19 12:32:41 +05:30
esp4.c esp4: Fix integrity verification when ESN are used 2016-12-10 19:07:26 +01:00
fib_frontend.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-08-17 14:18:51 +05:30
fib_lookup.h ipv4: consider TOS in fib_select_default 2015-07-24 22:46:11 -07:00
fib_rules.c net: ipv6: use common fib_default_rule_pref 2015-09-09 14:19:50 -07:00
fib_semantics.c ipv4: fix NULL dereference in free_fib_info_rcu() 2017-08-30 10:19:18 +02:00
fib_trie.c net: Improve handling of failures on link and route dumps 2017-06-07 12:05:58 +02:00
fou.c net: add recursion limit to GRO 2016-11-15 07:46:38 +01:00
gre_demux.c gre: Remove support for sharing GRE protocol hook. 2015-08-10 14:03:54 -07:00
gre_offload.c net: add recursion limit to GRO 2016-11-15 07:46:38 +01:00
icmp.c net: inet: Support UID-based routing in IP protocols. 2017-01-02 14:44:15 +05:30
igmp.c igmp: add a missing spin_lock_init() 2017-07-05 14:37:14 +02:00
inet_connection_sock.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-11-20 20:53:19 +05:30
inet_diag.c net: inet: diag: expose the socket mark to privileged processes. 2016-10-12 17:34:22 +05:30
inet_fragment.c Revert "net: use lib/percpu_counter API for fragmentation mem accounting" 2017-09-27 11:00:11 +02:00
inet_hashtables.c tcp/dccp: fix hashdance race for passive sessions 2015-10-23 05:42:21 -07:00
inet_lro.c
inet_timewait_sock.c tcp/dccp: fix timewait races in timer handling 2015-09-21 16:32:29 -07:00
inetpeer.c net: Add helper function to compare inetpeer addresses 2015-08-28 13:32:36 -07:00
ip_forward.c net: Pass net into dst_output and remove dst_output_okfn 2015-10-08 04:26:54 -07:00
ip_fragment.c Revert "net: fix percpu memory leaks" 2017-09-27 11:00:11 +02:00
ip_gre.c vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices 2016-06-24 10:18:18 -07:00
ip_input.c ipv4: Pass struct net into ip_defrag and ip_check_defrag 2015-10-12 19:44:16 -07:00
ip_options.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
ip_output.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-08-17 14:18:51 +05:30
ip_sockglue.c net: Allow IP_MULTICAST_IF to set index to L3 slave 2017-11-30 08:37:26 +00:00
ip_tunnel_core.c tunnels: Remove encapsulation offloads on decap. 2016-10-31 04:13:59 -06:00
ip_tunnel.c vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices 2016-06-24 10:18:18 -07:00
ip_vti.c vti: fix use after free in vti_tunnel_xmit/vti6_tnl_xmit 2017-10-21 17:09:02 +02:00
ipcomp.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
ipconfig.c ipconfig: send Client-identifier in DHCP requests 2015-10-18 19:23:52 -07:00
ipip.c ipip: only increase err_count for some certain type icmp in ipip_err 2017-11-18 11:11:06 +01:00
ipmr.c ipmr, ip6mr: fix scheduling while atomic and a deadlock with ipmr_get_route 2016-11-15 07:46:37 +01:00
Kconfig net: diag: Support destroying TCP sockets. 2016-04-07 16:49:53 +05:30
Makefile sysfs_net_ipv4: Add sysfs-based knobs for controlling TCP window size 2016-02-16 13:51:15 -08:00
netfilter.c ipv4: Pass struct net into ip_route_me_harder 2015-09-29 20:21:32 +02:00
ping.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-05-04 12:01:39 +08:00
proc.c net: track success and failure of TCP PMTU probing 2015-07-21 22:36:33 -07:00
protocol.c net: Export inet_offloads and inet6_offloads 2014-09-19 17:15:31 -04:00
raw.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-05-15 17:32:20 +08:00
route.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-09-01 13:59:45 +05:30
syncookies.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-11-20 20:53:19 +05:30
sysctl_net_ipv4.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2016-11-15 18:33:34 +05:30
sysfs_net_ipv4.c sysfs_net_ipv4: Add sysfs-based knobs for controlling TCP window size 2016-02-16 13:51:15 -08:00
tcp_bic.c tcp: add tcp_in_slow_start helper 2015-07-09 14:22:52 -07:00
tcp_cdg.c tcp: do not slow start when cwnd equals ssthresh 2015-07-09 14:22:52 -07:00
tcp_cong.c tcp: disallow cwnd undo when switching congestion control 2017-06-14 13:16:19 +02:00
tcp_cubic.c tcp_cubic: do not set epoch_start in the future 2015-09-17 22:35:07 -07:00
tcp_dctcp.c dctcp: avoid bogus doubling of cwnd after loss 2016-11-21 10:06:39 +01:00
tcp_diag.c net: diag: Support destroying TCP sockets. 2016-04-07 16:49:53 +05:30
tcp_fastopen.c tcp: initialize max window for a new fastopen socket 2017-02-04 09:45:09 +01:00
tcp_highspeed.c tcp: add tcp_in_slow_start helper 2015-07-09 14:22:52 -07:00
tcp_htcp.c tcp: add tcp_in_slow_start helper 2015-07-09 14:22:52 -07:00
tcp_hybla.c tcp: do not slow start when cwnd equals ssthresh 2015-07-09 14:22:52 -07:00
tcp_illinois.c tcp: add tcp_in_slow_start helper 2015-07-09 14:22:52 -07:00
tcp_input.c BACKPORT: tcp/dccp: drop SYN packets if accept queue is full 2017-12-21 10:42:52 +08:00
tcp_ipv4.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-11-20 20:53:19 +05:30
tcp_lp.c tcp: fix wraparound issue in tcp_lp 2017-05-14 13:32:58 +02:00
tcp_memcontrol.c memcg: cleanup static keys decrement 2015-02-12 18:54:10 -08:00
tcp_metrics.c tcp: convert cached rtt from usec to jiffies when feeding initial rto 2016-04-20 15:41:56 +09:00
tcp_minisocks.c tcp: do not inherit fastopen_req from parent 2017-05-14 13:32:58 +02:00
tcp_offload.c tcp: reserve tcp_skb_mss() to tcp stack 2015-06-11 16:33:10 -07:00
tcp_output.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-11-26 12:03:21 +08:00
tcp_probe.c
tcp_recovery.c tcp: use RACK to detect losses 2015-10-21 07:00:53 -07:00
tcp_scalable.c tcp: add tcp_in_slow_start helper 2015-07-09 14:22:52 -07:00
tcp_timer.c net: fix keepalive code vs TCP_FASTOPEN_CONNECT 2017-08-12 19:29:08 -07:00
tcp_vegas.c tcp: add tcp_in_slow_start helper 2015-07-09 14:22:52 -07:00
tcp_vegas.h tcp: prepare CC get_info() access from getsockopt() 2015-04-29 17:10:38 -04:00
tcp_veno.c tcp: add tcp_in_slow_start helper 2015-07-09 14:22:52 -07:00
tcp_westwood.c tcp_westwood: fix tcp_westwood_info() 2015-05-05 19:50:09 -04:00
tcp_yeah.c tcp: cwnd does not increase in TCP YeAH 2016-09-30 10:18:34 +02:00
tcp.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-10-04 12:03:25 +08:00
tunnel4.c
udp_diag.c net: inet: diag: expose the socket mark to privileged processes. 2016-10-12 17:34:22 +05:30
udp_impl.h net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
udp_offload.c net: avoid skb_warn_bad_offload false positives on UFO 2017-08-12 19:29:08 -07:00
udp_tunnel.c tunnel: Clear IPCB(skb)->opt before dst_link_failure called 2016-04-20 15:41:56 +09:00
udp.c Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android 2017-08-17 14:18:51 +05:30
udplite.c
xfrm4_input.c netfilter: Pass net into okfn 2015-09-17 17:18:37 -07:00
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c ipv4: hash net ptr into fragmentation bucket selection 2015-03-25 14:07:04 -04:00
xfrm4_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-10-24 06:54:12 -07:00
xfrm4_policy.c BACKPORT: net: xfrm: support setting an output mark. 2017-10-15 23:54:33 +05:30
xfrm4_protocol.c
xfrm4_state.c
xfrm4_tunnel.c