@@ -1118,6 +1118,14 @@ bindv6only - BOOLEAN
Default: FALSE (as specified in RFC3493)
+flowlabel_consistency - BOOLEAN
+ Protect the consistency (and unicity) of flow label.
+ You have to disable it to use IPV6_FL_F_REFLECT flag on the
+ flow label manager.
+ TRUE: enabled
+ FALSE: disabled
+ Default: TRUE
+
anycast_src_echo_reply - BOOLEAN
Controls the use of anycast addresses as source addresses for ICMPv6
echo reply
@@ -27,6 +27,7 @@ struct netns_sysctl_ipv6 {
int ip6_rt_gc_elasticity;
int ip6_rt_mtu_expires;
int ip6_rt_min_advmss;
+ int flowlabel_consistency;
int icmpv6_time;
int anycast_src_echo_reply;
};
@@ -775,6 +775,7 @@ static int __net_init inet6_net_init(struct net *net)
net->ipv6.sysctl.bindv6only = 0;
net->ipv6.sysctl.icmpv6_time = 1*HZ;
+ net->ipv6.sysctl.flowlabel_consistency = 1;
atomic_set(&net->ipv6.rt_genid, 0);
err = ipv6_init_mibs(net);
@@ -588,8 +588,15 @@ int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
case IPV6_FL_A_GET:
if (freq.flr_flags & IPV6_FL_F_REFLECT) {
+ struct net *net = sock_net(sk);
+ if (net->ipv6.sysctl.flowlabel_consistency) {
+ net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
+ return -EPERM;
+ }
+
if (sk->sk_protocol != IPPROTO_TCP)
return -ENOPROTOOPT;
+
np->repflow = 1;
return 0;
}
@@ -31,6 +31,13 @@ static struct ctl_table ipv6_table_template[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
+ {
+ .procname = "flowlabel_consistency",
+ .data = &init_net.ipv6.sysctl.flowlabel_consistency,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
{ }
};
@@ -59,6 +66,7 @@ static int __net_init ipv6_sysctl_net_init(struct net *net)
goto out;
ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
+ ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
ipv6_route_table = ipv6_route_sysctl_init(net);
if (!ipv6_route_table)
With the introduction of IPV6_FL_F_REFLECT, there is no guarantee of flow label unicity. This patch introduces a new sysctl to protect the old behaviour, enable by default. Changelog of V3: * rename ip6_flowlabel_consistency to flowlabel_consistency * use net_info_ratelimited() * checkpatch cleanups Signed-off-by: Florent Fourcot <florent.fourcot@enst-bretagne.fr> --- Documentation/networking/ip-sysctl.txt | 8 ++++++++ include/net/netns/ipv6.h | 1 + net/ipv6/af_inet6.c | 1 + net/ipv6/ip6_flowlabel.c | 7 +++++++ net/ipv6/sysctl_net_ipv6.c | 8 ++++++++ 5 files changed, 25 insertions(+)