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b3d051477c
kernel-ark/net/ipv4
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Eric Dumazet b3d051477c tcp: do not mess with listener sk_wmem_alloc 
When removing sk_refcnt manipulation on synflood, I missed that
using skb_set_owner_w() was racy, if sk->sk_wmem_alloc had already
transitioned to 0.

We should hold sk_refcnt instead, but this is a big deal under attack.
(Doing so increase performance from 3.2 Mpps to 3.8 Mpps only)

In this patch, I chose to not attach a socket to syncookies skb.

Performance is now 5 Mpps instead of 3.2 Mpps.

Following patch will remove last known false sharing in
tcp_rcv_state_process()

Fixes: 3b24d854cb ("tcp/dccp: do not touch listener sk_refcnt under synflood")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-15 16:45:44 -04:00
..
netfilter netfilter: ipv4: fix NULL dereference 2016-03-28 17:59:29 +02:00
af_inet.c GSO: Support partial segmentation offload 2016-04-14 16:23:41 -04:00
ah4.c
arp.c arp: correct return value of arp_rcv 2016-03-07 14:55:04 -05:00
cipso_ipv4.c net: introduce lockdep_is_held and update various places to use it 2016-04-07 16:44:14 -04:00
datagram.c
devinet.c ipv4: Don't do expensive useless work during inetdev destroy. 2016-03-13 23:28:35 -04:00
esp4.c
fib_frontend.c ipv4: initialize flowi4_flags before calling fib_lookup() 2016-03-22 15:59:23 -04:00
fib_lookup.h
fib_rules.c
fib_semantics.c net: ipv4: Consider failed nexthops in multipath routes 2016-04-11 15:16:13 -04:00
fib_trie.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-01 15:56:08 -08:00
fou.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-04-09 17:41:41 -04:00
gre_demux.c
gre_offload.c GSO: Support partial segmentation offload 2016-04-14 16:23:41 -04:00
icmp.c net: ipv4: Convert IP network timestamps to be y2038 safe 2016-03-01 17:18:44 -05:00
igmp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-03-08 12:34:12 -05:00
inet_connection_sock.c tcp/dccp: fix inet_reuseport_add_sock() 2016-04-07 12:02:33 -04:00
inet_diag.c tcp/dccp: do not touch listener sk_refcnt under synflood 2016-04-04 22:11:20 -04:00
inet_fragment.c
inet_hashtables.c tcp/dccp: fix inet_reuseport_add_sock() 2016-04-07 12:02:33 -04:00
inet_timewait_sock.c
inetpeer.c
ip_forward.c net: remove skb_sender_cpu_clear() 2016-03-01 17:36:47 -05:00
ip_fragment.c net: Export ip fragment sysctl to unprivileged users 2016-02-16 20:42:54 -05:00
ip_gre.c GRE: Disable segmentation offloads w/ CSUM and we are encapsulated via FOU 2016-04-07 16:56:33 -04:00
ip_input.c ipv4: namespacify ip_early_demux sysctl knob 2016-02-16 20:42:54 -05:00
ip_options.c net: ipv4: Convert IP network timestamps to be y2038 safe 2016-03-01 17:18:44 -05:00
ip_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-03-08 12:34:12 -05:00
ip_sockglue.c udp: do not expect udp headers in recv cmsg IP_CMSG_CHECKSUM 2016-04-13 22:24:52 -04:00
ip_tunnel_core.c ip_tunnel: implement __iptunnel_pull_header 2016-04-06 16:50:32 -04:00
ip_tunnel.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-03-08 12:34:12 -05:00
ip_vti.c
ipcomp.c
ipconfig.c ipv4: ipconfig: avoid unused ic_proto_used symbol 2016-01-29 19:39:09 -08:00
ipip.c iptunnel: scrub packet in iptunnel_pull_header 2016-02-18 14:34:54 -05:00
ipmr.c
Kconfig ipv4: Remove inet_lro library 2016-02-17 16:15:46 -05:00
Makefile ipv4: Remove inet_lro library 2016-02-17 16:15:46 -05:00
netfilter.c
ping.c sock: enable timestamping using control messages 2016-04-04 15:50:30 -04:00
proc.c ipv4: Namespaceify ip_default_ttl sysctl knob 2016-02-16 20:42:54 -05:00
protocol.c
raw.c sock: enable timestamping using control messages 2016-04-04 15:50:30 -04:00
route.c route: check and remove route cache when we get route 2016-02-18 11:31:36 -05:00
syncookies.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
sysctl_net_ipv4.c net: ipv4: Consider failed nexthops in multipath routes 2016-04-11 15:16:13 -04:00
tcp_bic.c
tcp_cdg.c
tcp_cong.c
tcp_cubic.c
tcp_dctcp.c
tcp_diag.c
tcp_fastopen.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c tcp: do not mess with listener sk_wmem_alloc 2016-04-15 16:45:44 -04:00
tcp_ipv4.c tcp: do not mess with listener sk_wmem_alloc 2016-04-15 16:45:44 -04:00
tcp_lp.c
tcp_metrics.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-03-08 12:34:12 -05:00
tcp_minisocks.c tcp: rate limit ACK sent by SYN_RECV request sockets 2016-04-04 22:11:20 -04:00
tcp_offload.c GSO: Support partial segmentation offload 2016-04-14 16:23:41 -04:00
tcp_output.c tcp: do not mess with listener sk_wmem_alloc 2016-04-15 16:45:44 -04:00
tcp_probe.c net: ipv4: tcp_probe: Replace timespec with timespec64 2016-03-01 17:18:44 -05:00
tcp_recovery.c
tcp_scalable.c
tcp_timer.c ipv4: Namespaceify tcp_orphan_retries sysctl knob 2016-02-07 14:35:11 -05:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c tcp_yeah: don't set ssthresh below 2 2016-01-11 17:25:16 -05:00
tcp.c sock: enable timestamping using control messages 2016-04-04 15:50:30 -04:00
tunnel4.c
udp_diag.c udp: no longer use SLAB_DESTROY_BY_RCU 2016-04-04 22:11:19 -04:00
udp_impl.h
udp_offload.c GSO: Support partial segmentation offload 2016-04-14 16:23:41 -04:00
udp_tunnel.c udp: Add socket based GRO and config 2016-04-07 16:53:29 -04:00
udp.c udp: do not expect udp headers in recv cmsg IP_CMSG_CHECKSUM 2016-04-13 22:24:52 -04:00
udplite.c
xfrm4_input.c
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c
xfrm4_output.c
xfrm4_policy.c
xfrm4_protocol.c
xfrm4_state.c
xfrm4_tunnel.c