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linux/net/ipv6
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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
..
netfilter Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2015-10-17 14:28:03 +02:00
addrconf.c netlink: Rightsize IFLA_AF_SPEC size calculation 2015-10-21 19:15:20 -07:00
addrconf_core.c ipv6: change ipv6_stub_impl.ipv6_dst_lookup to take net argument 2015-07-31 15:21:30 -07:00
addrlabel.c netlink: implement nla_put_in_addr and nla_put_in6_addr 2015-03-31 13:58:35 -04:00
af_inet6.c ipv6: Disable flowlabel state ranges by default 2015-07-31 17:07:11 -07:00
ah6.c ah6: fix error return code 2015-08-25 13:37:31 -07:00
anycast.c ipv6: coding style: comparison for equality with NULL 2015-03-31 13:51:54 -04:00
datagram.c ipv6: constify ip6_xmit() sock argument 2015-09-25 13:00:38 -07:00
esp6.c esp6: Switch to new AEAD interface 2015-05-28 11:23:20 +08:00
exthdrs.c ipv6: use flag instead of u16 for hop in inet6_skb_parm 2015-07-09 15:06:59 -07:00
exthdrs_core.c ipv6: coding style: comparison for equality with NULL 2015-03-31 13:51:54 -04:00
exthdrs_offload.c ipv6: fix exthdrs offload registration in out_rt path 2015-09-02 15:31:00 -07:00
fib6_rules.c net: ipv6: use common fib_default_rule_pref 2015-09-09 14:19:50 -07:00
icmp.c net: Add VRF support to IPv6 stack 2015-10-13 04:55:08 -07:00
ila.c dst: Pass net into dst->output 2015-10-08 04:27:03 -07:00
inet6_connection_sock.c tcp/dccp: install syn_recv requests into ehash table 2015-10-03 04:32:41 -07:00
inet6_hashtables.c net: SO_INCOMING_CPU setsockopt() support 2015-10-12 19:28:20 -07:00
ip6_checksum.c
ip6_fib.c net: Export fib6_get_table and nd_tbl 2015-10-13 04:55:05 -07:00
ip6_flowlabel.c ipv6: Flow label state ranges 2015-05-03 21:58:01 -04:00
ip6_gre.c ip6_gre: Reduce log level in ip6gre_err() to debug 2015-09-24 15:28:43 -07:00
ip6_icmp.c
ip6_input.c netfilter: Pass net into okfn 2015-09-17 17:18:37 -07:00
ip6_offload.c ipv6: gro: support sit protocol 2015-10-21 19:36:11 -07:00
ip6_offload.h
ip6_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-10-20 06:08:27 -07:00
ip6_tunnel.c ip6_tunnel: Reduce log level in ip6_tnl_err() to debug 2015-09-24 16:08:37 -07:00
ip6_udp_tunnel.c vxlan: do not receive IPv4 packets on IPv6 socket 2015-08-29 13:07:54 -07:00
ip6_vti.c net: Pass net into dst_output and remove dst_output_okfn 2015-10-08 04:26:54 -07:00
ip6mr.c net: Pass net into dst_output and remove dst_output_okfn 2015-10-08 04:26:54 -07:00
ipcomp6.c
ipv6_sockglue.c ipv6: coding style: comparison for equality with NULL 2015-03-31 13:51:54 -04:00
Kconfig net: Identifier Locator Addressing module 2015-08-17 21:33:06 -07:00
Makefile net: Identifier Locator Addressing module 2015-08-17 21:33:06 -07:00
mcast.c net: Pass net into dst_output and remove dst_output_okfn 2015-10-08 04:26:54 -07:00
mcast_snoop.c net: fix wrong skb_get() usage / crash in IGMP/MLD parsing code 2015-08-13 17:08:39 -07:00
mip6.c ipv6: use ktime_t for internal timestamps 2015-10-05 03:16:47 -07:00
ndisc.c net: Add VRF support to IPv6 stack 2015-10-13 04:55:08 -07:00
netfilter.c ipv6: Pass struct net into ip6_route_me_harder 2015-09-29 20:21:32 +02:00
output_core.c ipv4, ipv6: Pass net into ip_local_out and ip6_local_out 2015-10-08 04:27:02 -07:00
ping.c
proc.c
protocol.c
raw.c net: Pass net into dst_output and remove dst_output_okfn 2015-10-08 04:26:54 -07:00
reassembly.c inet: frags: remove INET_FRAG_EVICTED and use list_evictor for the test 2015-07-26 21:00:15 -07:00
route.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-10-20 06:08:27 -07:00
sit.c ip_gre: Add support to collect tunnel metadata. 2015-08-10 14:03:54 -07:00
syncookies.c net: shrink struct sock and request_sock by 8 bytes 2015-10-12 19:28:22 -07:00
sysctl_net_ipv6.c ipv6: Implement different admin modes for automatic flow labels 2015-07-31 17:07:11 -07:00
tcp_ipv6.c tcp/dccp: fix hashdance race for passive sessions 2015-10-23 05:42:21 -07:00
tcpv6_offload.c
tunnel6.c
udp.c net: SO_INCOMING_CPU setsockopt() support 2015-10-12 19:28:20 -07:00
udp_impl.h
udp_offload.c
udplite.c
xfrm6_input.c netfilter: Pass struct net into the netfilter hooks 2015-09-17 17:18:37 -07:00
xfrm6_mode_beet.c xfrm: simplify xfrm_address_t use 2015-03-31 13:58:35 -04:00
xfrm6_mode_ro.c
xfrm6_mode_transport.c
xfrm6_mode_tunnel.c xfrm6: Fix IPv6 ECN decapsulation 2015-08-11 12:41:34 +02:00
xfrm6_output.c dst: Pass net into dst->output 2015-10-08 04:27:03 -07:00
xfrm6_policy.c ipv6: Merge __ip6_local_out and __ip6_local_out_sk 2015-10-08 04:26:58 -07:00
xfrm6_protocol.c
xfrm6_state.c
xfrm6_tunnel.c