Eric Dumazet 5e0724d027 tcp/dccp: fix hashdance race for passive sessions ... Multiple cpus can process duplicates of incoming ACK messages matching a SYN_RECV request socket. This is a rare event under normal operations, but definitely can happen. Only one must win the race, otherwise corruption would occur. To fix this without adding new atomic ops, we use logic in inet_ehash_nolisten() to detect the request was present in the same ehash bucket where we try to insert the new child. If request socket was not found, we have to undo the child creation. This actually removes a spin_lock()/spin_unlock() pair in reqsk_queue_unlink() for the fast path. Fixes: e994b2f0fb ("tcp: do not lock listener to process SYN packets") Fixes: 079096f103 ("tcp/dccp: install syn_recv requests into ehash table") Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2015-10-23 05:42:21 -07:00
..
ccids	dccp: re-enable debug macro	2014-02-16 23:45:00 -05:00
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: kerneldoc warning fixes	2014-11-18 15:26:31 -05:00
feat.h	net: dccp: Remove extern from function prototypes	2013-10-19 19:12:11 -04:00
input.c	dccp: spelling s/reseting/resetting	2014-11-18 15:26:32 -05:00
ipv4.c	tcp/dccp: fix hashdance race for passive sessions	2015-10-23 05:42:21 -07:00
ipv6.c	tcp/dccp: fix hashdance race for passive sessions	2015-10-23 05:42:21 -07:00
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
minisocks.c	tcp/dccp: fix hashdance race for passive sessions	2015-10-23 05:42:21 -07:00
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	net: Remove iocb argument from sendmsg and recvmsg	2015-03-02 13:06:31 -05:00
proto.c	tcp: fix recv with flags MSG_WAITALL | MSG_PEEK	2015-07-27 01:06:53 -07:00
qpolicy.c
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