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alistair23-linux/net/ipv4
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Tilmans, Olivier (Nokia - BE/Antwerp) f6fee16dbb tcp: Accept ECT on SYN in the presence of RFC8311 
Linux currently disable ECN for incoming connections when the SYN
requests ECN and the IP header has ECT(0)/ECT(1) set, as some
networks were reportedly mangling the ToS byte, hence could later
trigger false congestion notifications.

RFC8311 ยง4.3 relaxes RFC3168's requirements such that ECT can be set
one TCP control packets (including SYNs). The main benefit of this
is the decreased probability of losing a SYN in a congested
ECN-capable network (i.e., it avoids the initial 1s timeout).
Additionally, this allows the development of newer TCP extensions,
such as AccECN.

This patch relaxes the previous check, by enabling ECN on incoming
connections using SYN+ECT if at least one bit of the reserved flags
of the TCP header is set. Such bit would indicate that the sender of
the SYN is using a newer TCP feature than what the host implements,
such as AccECN, and is thus implementing RFC8311. This enables
end-hosts not supporting such extensions to still negociate ECN, and
to have some of the benefits of using ECN on control packets.

Signed-off-by: Olivier Tilmans <olivier.tilmans@nokia-bell-labs.com>
Suggested-by: Bob Briscoe <research@bobbriscoe.net>
Cc: Koen De Schepper <koen.de_schepper@nokia-bell-labs.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-04 17:43:48 -07:00
..
bpfilter net: bpfilter: disallow to remove bpfilter module while being used 2019-01-11 18:05:41 -08:00
netfilter netfilter: nf_tables: merge ipv4 and ipv6 nat chain types 2019-03-01 14:36:59 +01:00
af_inet.c net: use rcu_dereference_protected to fetch sk_dst_cache in sk_destruct 2019-04-01 18:10:51 -07:00
ah4.c
arp.c
cipso_ipv4.c netlabel: fix out-of-bounds memory accesses 2019-02-27 21:45:24 -08:00
datagram.c
devinet.c net: ignore sysctl_devconf_inherit_init_net without SYSCTL 2019-03-04 13:14:34 -08:00
esp4.c esp: Skip TX bytes accounting when sending from a request socket 2019-01-28 11:20:58 +01:00
esp4_offload.c net: use skb_sec_path helper in more places 2018-12-19 11:21:37 -08:00
fib_frontend.c ipv4: Add fib_nh_common to fib_result 2019-04-03 21:50:20 -07:00
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 ipv6: Flip to fib_nexthop_info 2019-04-03 21:50:20 -07:00
fib_trie.c ipv4: Add fib_nh_common to fib_result 2019-04-03 21:50:20 -07:00
fou.c fou: Support binding FoU socket 2019-03-27 13:30:07 -07:00
gre_demux.c net: ip_gre: use erspan key field for tunnel lookup 2019-01-22 11:52:17 -08:00
gre_offload.c
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 inet: minor optimization for backlog setting in listen(2) 2018-11-07 22:31:07 -08:00
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 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-12-20 11:53:36 -08:00
ip_fragment.c net: remove unused struct inet_frag_queue.fragments field 2019-02-26 08:27:05 -08:00
ip_gre.c route: Add multipath_hash in flowi_common to make user-define hash 2019-02-27 12:50:17 -08:00
ip_input.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-03-02 12:54:35 -08:00
ip_options.c net: avoid use IPCB in cipso_v4_error 2019-02-25 14:32:35 -08:00
ip_output.c net: use kfree_skb_list() from ip_do_fragment() 2019-04-04 10:48:26 -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 ip_tunnel: Add dst_cache support in lwtunnel_state of ip tunnel 2019-02-24 22:13:49 -08:00
ip_vti.c vti4: Fix a ipip packet processing bug in 'IPCOMP' virtual tunnel 2019-01-09 14:00:37 +01:00
ipcomp.c
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 ipmr: ip6mr: Create new sockopt to clear mfc cache or vifs 2019-02-21 13:05:05 -08:00
ipmr_base.c
Kconfig
Makefile
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
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 ipv4: Add fib_nh_common to fib_result 2019-04-03 21:50:20 -07:00
syncookies.c tcp: free request sock directly upon TFO or syncookies error 2019-03-19 14:13:01 -07:00
sysctl_net_ipv4.c ipv4: Allow amount of dirty memory from fib resizing to be controllable 2019-03-21 13:29:53 -07:00
tcp.c tcp: cleanup sk_tx_skb_cache before reuse 2019-03-29 13:16:44 -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_cong.c
tcp_cubic.c
tcp_dctcp.c
tcp_dctcp.h
tcp_diag.c
tcp_fastopen.c
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c tcp: Accept ECT on SYN in the presence of RFC8311 2019-04-04 17:43:48 -07:00
tcp_ipv4.c tcp: add one skb cache for rx 2019-03-23 21:57:38 -04:00
tcp_lp.c
tcp_metrics.c genetlink: make policy common to family 2019-03-22 10:38:23 -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 conditional branches from tcp_mstamp_refresh() 2019-03-23 21:43:21 -04:00
tcp_rate.c
tcp_recovery.c
tcp_scalable.c
tcp_timer.c tcp: Refactor pingpong code 2019-01-27 13:29:43 -08:00
tcp_ulp.c
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 udp: fix possible user after free in error handler 2019-02-22 16:05:11 -08:00
udp_diag.c
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
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c
xfrm4_output.c
xfrm4_policy.c
xfrm4_protocol.c net: Convert protocol error handlers from void to int 2018-11-08 17:13:08 -08:00
xfrm4_state.c
xfrm4_tunnel.c