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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
..
6lowpan 6lowpan: Off by one handling ->nexthdr 2019-04-23 19:09:58 +02:00
9p 9p/net: fix memory leak in p9_client_create 2019-03-13 11:50:04 +01:00
802
8021q netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
appletalk net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
atm net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
ax25 net: ax25: fix misuse of %x 2019-04-21 10:37:26 -07:00
batman-adv genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
bluetooth Bluetooth: Align minimum encryption key size for LE and BR/EDR connections 2019-04-25 06:18:07 -07:00
bpf bpf: Introduce bpf sk local storage 2019-04-27 09:07:04 -07:00
bpfilter bpfilter: re-add header search paths to tools include to fix build error 2019-02-23 13:34:40 -08:00
bridge netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
caif net: caif: avoid using qdisc_qlen() 2019-04-10 12:20:46 -07:00
can netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
ceph libceph: fix breakage caused by multipage bvecs 2019-03-25 22:28:07 +01:00
core devlink: Change devlink health locking mechanism 2019-05-01 11:07:03 -04:00
dcb netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
dccp net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
decnet netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
dns_resolver dns: remove redundant zero length namelen check 2019-04-11 14:01:08 -07:00
dsa net: dsa: Remove legacy probing support 2019-04-30 23:15:35 -04:00
ethernet net: pass net_device argument to the eth_get_headlen 2019-04-23 18:36:34 +02:00
hsr genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
ieee802154 genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
ife
ipv4 tcp: avoid unconditional congestion window undo on SYN retransmit 2019-05-01 11:47:54 -04:00
ipv6 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2019-04-30 09:26:13 -04:00
iucv iucv: Remove SKB list assumptions. 2018-11-10 16:55:11 -08:00
kcm kcm: switch order of device registration to fix a crash 2019-04-01 14:59:20 -07:00
key af_key: unconditionally clone on broadcast 2019-02-12 10:36:42 +01:00
l2tp genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
l3mdev l3mdev: add function to retreive upper master 2018-12-03 14:15:26 -08:00
lapb
llc llc: Check address length before reading address field 2019-04-12 10:25:03 -07:00
mac80211 Various updates, notably: 2019-04-26 16:05:52 -04:00
mac802154
mpls netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
ncsi genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
netfilter genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
netlabel genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
netlink genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
netrom net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
nfc genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
nsh
openvswitch genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
packet netlink: make nla_nest_start() add NLA_F_NESTED flag 2019-04-27 17:03:44 -04:00
phonet netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
psample genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
qrtr netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
rds net: rds: exchange of 8K and 1M pool 2019-04-24 12:07:08 -07:00
rfkill rfkill: gpio: Remove unused include 2018-12-18 13:13:56 +01:00
rose Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-25 23:52:29 -04:00
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-25 23:52:29 -04:00
sched netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
sctp net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
smc genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
strparser net: strparser: make it explicitly non-modular 2019-04-22 21:50:54 -07:00
sunrpc Fix miscellaneous nfsd bugs, in NFSv4.1 callbacks, NFSv4.1 2019-04-23 13:40:55 -07:00
switchdev switchdev: Remove unused transaction item queue 2019-03-01 21:35:19 -08:00
tipc genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
tls net/tls: byte swap device req TCP seq no upon setting 2019-04-27 16:52:21 -04:00
unix datagram: remove rendundant 'peeked' argument 2019-04-08 09:51:54 -07:00
vmw_vsock vsock/virtio: fix kernel panic from virtio_transport_reset_no_sock 2019-03-08 15:15:44 -08:00
wimax genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
wireless genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
x25 net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
xdp xsk: fix XDP socket ring buffer memory ordering 2019-04-16 20:13:10 -07:00
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2019-04-30 09:26:13 -04:00
compat.c net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
Kconfig net: devlink: select NET_DEVLINK from drivers 2019-03-24 14:55:31 -04:00
Makefile net: split out functions related to registering inflight socket files 2019-02-28 08:24:23 -07:00
socket.c net: socket: Fix missing break in switch statement 2019-04-26 11:28:47 -04:00
sysctl_net.c