[net-next 1/2] ipv6: sr: add a per namespace sysctl to control seg6 flowlabel

[Ahmed Abdelsalam]

This patch adds a per namespace sysctl, named 'seg6_flowlabel', to be used
by seg6_do_srh_encap() to control the behaviour of setting the flowlabel
value of outer IPv6.

The currently support behaviours are as follows:
-1 set flowlabel to zero.
 0 copy flowlabel from Inner paceket in case of Inner IPv6 (0 for IPv4/L2)
 1 Compute the flowlabel using seg6_make_flowlabel()

Signed-off-by: Ahmed Abdelsalam <amsala...@gmail.com>
---
 include/net/netns/ipv6.h   | 1 +
 net/ipv6/sysctl_net_ipv6.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 97b3a54..c978a31 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -43,6 +43,7 @@ struct netns_sysctl_ipv6 {
        int max_hbh_opts_cnt;
        int max_dst_opts_len;
        int max_hbh_opts_len;
+       int seg6_flowlabel;
 };
 
 struct netns_ipv6 {
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
index 6fbdef6..e15cd37 100644
--- a/net/ipv6/sysctl_net_ipv6.c
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -152,6 +152,13 @@ static struct ctl_table ipv6_table_template[] = {
                .extra1         = &zero,
                .extra2         = &one,
        },
+       {
+               .procname       = "seg6_flowlabel",
+               .data           = &init_net.ipv6.sysctl.seg6_flowlabel,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec
+       },
        { }
 };
 
@@ -217,6 +224,7 @@ static int __net_init ipv6_sysctl_net_init(struct net *net)
        ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len;
        ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len;
        ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy,
+       ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel;
 
        ipv6_route_table = ipv6_route_sysctl_init(net);
        if (!ipv6_route_table)
-- 
2.1.4