ipv4: Namespaceify tcp_fastopen_key knob
authorHaishuang Yan <yanhaishuang@cmss.chinamobile.com>
Wed, 27 Sep 2017 03:35:42 +0000 (11:35 +0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 2 Oct 2017 00:55:54 +0000 (17:55 -0700)
commit437138485656c41e32b8c63c0987cfa0348be0e6
tree942ae784a68f7d351f62fd3ac48c1330d629ce31
parentdd000598a39b6937fcefdf143720ec9fb5250e72
ipv4: Namespaceify tcp_fastopen_key knob

Different namespace application might require different tcp_fastopen_key
independently of the host.

David Miller pointed out there is a leak without releasing the context
of tcp_fastopen_key during netns teardown. So add the release action in
exit_batch path.

Tested:
1. Container namespace:
# cat /proc/sys/net/ipv4/tcp_fastopen_key:
2817fff2-f803cf97-eadfd1f3-78c0992b

cookie key in tcp syn packets:
Fast Open Cookie
    Kind: TCP Fast Open Cookie (34)
    Length: 10
    Fast Open Cookie: 1e5dd82a8c492ca9

2. Host:
# cat /proc/sys/net/ipv4/tcp_fastopen_key:
107d7c5f-68eb2ac7-02fb06e6-ed341702

cookie key in tcp syn packets:
Fast Open Cookie
    Kind: TCP Fast Open Cookie (34)
    Length: 10
    Fast Open Cookie: e213c02bf0afbc8a

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/netns/ipv4.h
include/net/tcp.h
net/ipv4/af_inet.c
net/ipv4/sysctl_net_ipv4.c
net/ipv4/tcp.c
net/ipv4/tcp_fastopen.c
net/ipv4/tcp_ipv4.c