diff options
| author |   Wei Wang <weiwan@google.com> | 2020-09-09 17:50:48 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-09-10 13:15:40 -0700 |
| commit | ac8f1710c12bb4c3626280ce03f05459ba8feef6 (patch) | |
| tree | f9db7718210545aa9708155babb2b1df39fb0fce /net/ipv4/sysctl_net_ipv4.c | |
| parent | ip: pass tos into ip_build_and_send_pkt() (diff) | |
| download | linux-dev-ac8f1710c12bb4c3626280ce03f05459ba8feef6.tar.xz linux-dev-ac8f1710c12bb4c3626280ce03f05459ba8feef6.zip | |
tcp: reflect tos value received in SYN to the socket
This commit adds a new TCP feature to reflect the tos value received in
SYN, and send it out on the SYN-ACK, and eventually set the tos value of
the established socket with this reflected tos value. This provides a
way to set the traffic class/QoS level for all traffic in the same
connection to be the same as the incoming SYN request. It could be
useful in data centers to provide equivalent QoS according to the
incoming request.
This feature is guarded by /proc/sys/net/ipv4/tcp_reflect_tos, and is by
default turned off.
Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/sysctl_net_ipv4.c')
| -rw-r--r-- | net/ipv4/sysctl_net_ipv4.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index 54023a46db04..3e5f4f2e705e 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -1330,6 +1330,15 @@ static struct ctl_table ipv4_net_table[] = { .extra2 = &comp_sack_nr_max, }, { + .procname = "tcp_reflect_tos", + .data = &init_net.ipv4.sysctl_tcp_reflect_tos, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE, + }, + { .procname = "udp_rmem_min", .data = &init_net.ipv4.sysctl_udp_rmem_min, .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min), |