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Date: Tue, 14 Jan 2014 18:50:16 +0100
From: Florent Fourcot <florent.fourcot@...t-bretagne.fr>
To: netdev@...r.kernel.org
Cc: Florent Fourcot <florent.fourcot@...t-bretagne.fr>
Subject: [PATCH net-next 3/3] ipv6: add ip6_flowlabel_consistency sysctl
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.
Signed-off-by: Florent Fourcot <florent.fourcot@...t-bretagne.fr>
---
Documentation/networking/ip-sysctl.txt | 8 ++++++++
include/net/netns/ipv6.h | 1 +
kernel/sysctl_binary.c | 1 +
net/ipv6/af_inet6.c | 1 +
net/ipv6/ip6_flowlabel.c | 7 +++++++
net/ipv6/sysctl_net_ipv6.c | 8 ++++++++
6 files changed, 26 insertions(+)
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index c97932c..7453640 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1118,6 +1118,14 @@ bindv6only - BOOLEAN
Default: FALSE (as specified in RFC3493)
+ip6_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
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 76fc7d1..3cc291b 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -27,6 +27,7 @@ struct netns_sysctl_ipv6 {
int ip6_rt_gc_elasticity;
int ip6_rt_mtu_expires;
int ip6_rt_min_advmss;
+ int ip6_flowlabel_consistency;
int icmpv6_time;
};
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index 653cbbd..7c32501 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -557,6 +557,7 @@ static const struct bin_table bin_net_ipv6_table[] = {
{ CTL_DIR, NET_IPV6_ROUTE, "route", bin_net_ipv6_route_table },
{ CTL_DIR, NET_IPV6_ICMP, "icmp", bin_net_ipv6_icmp_table },
{ CTL_INT, NET_IPV6_BINDV6ONLY, "bindv6only" },
+ { CTL_INT, NET_IPV6_FLOWLABEL_CONSISTENCY, "ip6_flowlabel_consistency" },
{ CTL_INT, NET_IPV6_IP6FRAG_HIGH_THRESH, "ip6frag_high_thresh" },
{ CTL_INT, NET_IPV6_IP6FRAG_LOW_THRESH, "ip6frag_low_thresh" },
{ CTL_INT, NET_IPV6_IP6FRAG_TIME, "ip6frag_time" },
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index c921d5d..943c796 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -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.ip6_flowlabel_consistency = 1;
atomic_set(&net->ipv6.rt_genid, 0);
err = ipv6_init_mibs(net);
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 2c0f9dc..85f0453 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -587,8 +587,15 @@ 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.ip6_flowlabel_consistency) {
+ pr_info("Can not set IPV6_FL_F_REFLECT if ip6_flowlabel_consistency sysctl is enable \n");
+ return -EPERM;
+ }
+
if (sk->sk_protocol != IPPROTO_TCP)
return -ENOPROTOOPT;
+
np->repflow = 1;
return 0;
}
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
index 6b6a2c8..8c99cf0 100644
--- a/net/ipv6/sysctl_net_ipv6.c
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -31,6 +31,13 @@ static struct ctl_table ipv6_table_template[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
+ {
+ .procname = "ip6_flowlabel_consistency",
+ .data = &init_net.ipv6.sysctl.ip6_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.anycast_src_echo_reply;
+ ipv6_table[2].data = &net->ipv6.sysctl.ip6_flowlabel_consistency;
ipv6_route_table = ipv6_route_sysctl_init(net);
if (!ipv6_route_table)
--
1.8.5.2
--
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