Yuchung Cheng bc9f38c832 tcp: avoid unconditional congestion window undo on SYN retransmit ... Previously if an active TCP open has SYN timeout, it always undo the cwnd upon receiving the SYNACK. This is because tcp_clean_rtx_queue would reset tp->retrans_stamp when SYN is acked, which fools then tcp_try_undo_loss and tcp_packet_delayed. Addressing this issue is required to properly support undo for spurious SYN timeout. Fixing this is tricky -- for active TCP open tp->retrans_stamp records the time when the handshake starts, not the first retransmission time as the name may suggest. The simplest fix is for tcp_packet_delayed to ensure it is valid before comparing with other timestamp. One side effect of this change is active TCP Fast Open that incurred SYN timeout. Upon receiving a SYN-ACK that only acknowledged the SYN, it would immediately retransmit unacknowledged data in tcp_ack() because the data is marked lost after SYN timeout. But the retransmission would have an incorrect ack sequence number since rcv_nxt has not been updated yet tcp_rcv_synsent_state_process(), the retransmission needs to properly handed by tcp_rcv_fastopen_synack() like before. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2019-05-01 11:47:54 -04:00
..
bpfilter	net: bpfilter: dont use module_init in non-modular code	2019-04-22 21:50:54 -07:00
netfilter	netfilter: x_tables: merge ip and ipv6 masquerade modules	2019-04-11 20:59:29 +02:00
Kconfig	xfrm: make xfrm modes builtin	2019-04-08 09:15:17 +02:00
Makefile	xfrm: make xfrm modes builtin	2019-04-08 09:15:17 +02:00
af_inet.c	net: rework SIOCGSTAMP ioctl handling	2019-04-19 14:07:40 -07:00
ah4.c	net-ipv4: remove 2 always zero parameters from ipv4_redirect()	2018-09-26 20:30:55 -07:00
arp.c	net: Evict neighbor entries on carrier down	2018-10-12 09:47:39 -07:00
cipso_ipv4.c	netlabel: fix out-of-bounds memory accesses	2019-02-27 21:45:24 -08:00
datagram.c	ipv4: Allow sending multicast packets on specific i/f using VRF socket	2018-10-02 22:28:17 -07:00
devinet.c	netlink: make validation more configurable for future strictness	2019-04-27 17:07:21 -04:00
esp4.c	esp: Skip TX bytes accounting when sending from a request socket	2019-01-28 11:20:58 +01:00
esp4_offload.c	xfrm: store xfrm_mode directly, not its address	2019-04-08 09:15:28 +02:00
fib_frontend.c	netlink: make validation more configurable for future strictness	2019-04-27 17:07:21 -04:00
fib_lookup.h	ipv4: Add fib_nh_common to fib_result	2019-04-03 21:50:20 -07:00
fib_notifier.c	…
fib_rules.c	ipv4: fib_rules: Fix possible infinite loop in fib_empty_table	2018-12-30 12:57:04 -08:00
fib_semantics.c	netlink: make nla_nest_start() add NLA_F_NESTED flag	2019-04-27 17:03:44 -04:00
fib_trie.c	ipv4: Add fib_nh_common to fib_result	2019-04-03 21:50:20 -07:00
fou.c	genetlink: optionally validate strictly/dumps	2019-04-27 17:07:22 -04:00
gre_demux.c	net: ip_gre: use erspan key field for tunnel lookup	2019-01-22 11:52:17 -08:00
gre_offload.c	Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net	2018-07-03 10:29:26 +09:00
icmp.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-03-02 12:54:35 -08:00
igmp.c	net: remove unneeded switch fall-through	2019-02-21 13:48:00 -08:00
inet_connection_sock.c	ipv4: Prepare rtable for IPv6 gateway	2019-04-08 15:22:40 -07:00
inet_diag.c	inet_diag: fix reporting cgroup classid and fallback to priority	2019-02-12 13:35:57 -05:00
inet_fragment.c	net: remove unused struct inet_frag_queue.fragments field	2019-02-26 08:27:05 -08:00
inet_hashtables.c	net: dccp: fix kernel crash on module load	2018-12-24 15:27:56 -08:00
inet_timewait_sock.c	…
inetpeer.c	net: ipv4: use a dedicated counter for icmp_v4 redirect packets	2019-02-08 21:50:15 -08:00
ip_forward.c	ipv4: Prepare rtable for IPv6 gateway	2019-04-08 15:22:40 -07:00
ip_fragment.c	net: remove unused struct inet_frag_queue.fragments field	2019-02-26 08:27:05 -08:00
ip_gre.c	net: ip_gre: fix possible use-after-free in erspan_rcv	2019-04-08 16:16:47 -07:00
ip_input.c	vrf: check accept_source_route on the original netdevice	2019-04-01 10:44:58 -07:00
ip_options.c	vrf: check accept_source_route on the original netdevice	2019-04-01 10:44:58 -07:00
ip_output.c	ipv4: Add helpers for neigh lookup for nexthop	2019-04-08 15:22:41 -07:00
ip_sockglue.c	ip: on queued skb use skb_header_pointer instead of pskb_may_pull	2019-01-10 09:27:20 -05:00
ip_tunnel.c	iptunnel: NULL pointer deref for ip_md_tunnel_xmit	2019-03-06 10:43:06 -08:00
ip_tunnel_core.c	netlink: make validation more configurable for future strictness	2019-04-27 17:07:21 -04:00
ip_vti.c	xfrm: store xfrm_mode directly, not its address	2019-04-08 09:15:28 +02:00
ipcomp.c	net-ipv4: remove 2 always zero parameters from ipv4_redirect()	2018-09-26 20:30:55 -07:00
ipconfig.c	ipconfig: add carrier_timeout kernel parameter	2019-02-01 15:24:13 -08:00
ipip.c	ip_tunnel: Add tnl_update_pmtu in ip_md_tunnel_xmit	2019-01-26 09:43:03 -08:00
ipmr.c	netlink: make validation more configurable for future strictness	2019-04-27 17:07:21 -04:00
ipmr_base.c	netlink: make nla_nest_start() add NLA_F_NESTED flag	2019-04-27 17:03:44 -04:00
metrics.c	net: Add extack argument to ip_fib_metrics_init	2018-11-06 15:00:45 -08:00
netfilter.c	netfilter: ipv4: remove useless export_symbol	2019-01-28 11:32:58 +01:00
netlink.c	ipv4: Add ICMPv6 support when parse route ipproto	2019-03-01 16:41:27 -08:00
ping.c	ipv4: Allow sending multicast packets on specific i/f using VRF socket	2018-10-02 22:28:17 -07:00
proc.c	tcp: implement coalescing on backlog queue	2018-11-30 13:26:54 -08:00
protocol.c	fou, fou6: ICMP error handlers for FoU and GUE	2018-11-08 17:13:08 -08:00
raw.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-12-20 11:53:36 -08:00
raw_diag.c	…
route.c	netlink: make validation more configurable for future strictness	2019-04-27 17:07:21 -04:00
syncookies.c	tcp: free request sock directly upon TFO or syncookies error	2019-03-19 14:13:01 -07:00
sysctl_net_ipv4.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-04-25 23:52:29 -04:00
tcp.c	tcp: properly reset skb->truesize for tx recycling	2019-04-19 16:42:33 -07:00
tcp_bbr.c	tcp_bbr: adapt cwnd based on ack aggregation estimation	2019-01-24 22:27:27 -08:00
tcp_bic.c	…
tcp_bpf.c	bpf: sk_msg, sock{map|hash} redirect through ULP	2018-12-20 23:47:09 +01:00
tcp_cdg.c	tcp: cdg: use tcp high resolution clock cache	2018-10-15 22:56:42 -07:00
tcp_cong.c	…
tcp_cubic.c	…
tcp_dctcp.c	dctcp: more accurate tracking of packets delivery	2019-04-11 21:31:03 -07:00
tcp_dctcp.h	tcp: refactor DCTCP ECN ACK handling	2018-10-10 22:26:00 -07:00
tcp_diag.c	…
tcp_fastopen.c	…
tcp_highspeed.c	…
tcp_htcp.c	…
tcp_hybla.c	…
tcp_illinois.c	…
tcp_input.c	tcp: avoid unconditional congestion window undo on SYN retransmit	2019-05-01 11:47:54 -04:00
tcp_ipv4.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-04-05 14:14:19 -07:00
tcp_lp.c	…
tcp_metrics.c	genetlink: optionally validate strictly/dumps	2019-04-27 17:07:22 -04:00
tcp_minisocks.c	tcp: use tcp_md5_needed for timewait sockets	2019-02-26 13:16:03 -08:00
tcp_nv.c	…
tcp_offload.c	net: use indirect call wrappers at GRO transport layer	2018-12-15 13:23:02 -08:00
tcp_output.c	tcp: remove redundant check on tskb	2019-04-06 18:18:14 -07:00
tcp_rate.c	tcp: introduce tcp_skb_timestamp_us() helper	2018-09-21 19:37:59 -07:00
tcp_recovery.c	tcp: introduce tcp_skb_timestamp_us() helper	2018-09-21 19:37:59 -07:00
tcp_scalable.c	…
tcp_timer.c	tcp: Refactor pingpong code	2019-01-27 13:29:43 -08:00
tcp_ulp.c	tcp, ulp: remove socket lock assertion on ULP cleanup	2018-10-16 12:38:41 -07:00
tcp_vegas.c	…
tcp_vegas.h	…
tcp_veno.c	…
tcp_westwood.c	…
tcp_yeah.c	…
tunnel4.c	net: Convert protocol error handlers from void to int	2018-11-08 17:13:08 -08:00
udp.c	datagram: remove rendundant 'peeked' argument	2019-04-08 09:51:54 -07:00
udp_diag.c	net: diag: document swapped src/dst in udp_dump_one.	2018-10-28 19:27:21 -07:00
udp_impl.h	udp: add missing rehash callback to udplite	2019-01-17 15:01:08 -08:00
udp_offload.c	udp: use indirect call wrappers for GRO socket lookup	2018-12-15 13:23:02 -08:00
udp_tunnel.c	net/ipv4/udp_tunnel: prefer SO_BINDTOIFINDEX over SO_BINDTODEVICE	2019-01-17 14:55:52 -08:00
udplite.c	udp: add missing rehash callback to udplite	2019-01-17 15:01:08 -08:00
xfrm4_input.c	xfrm: reset transport header back to network header after all input transforms ahave been applied	2018-09-04 10:26:30 +02:00
xfrm4_output.c	xfrm: store xfrm_mode directly, not its address	2019-04-08 09:15:28 +02:00
xfrm4_policy.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next	2019-04-30 09:26:13 -04:00
xfrm4_protocol.c	xfrm: remove unneeded export_symbols	2019-04-23 07:42:20 +02:00
xfrm4_state.c	…
xfrm4_tunnel.c	…