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| author | Florent Fourcot <florent.fourcot@enst-bretagne.fr> | 2014-01-17 17:15:05 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-20 02:12:31 +0100 |
| commit | 6444f72b4b74f627c51891101e93ba2b94078b0a (patch) | |
| tree | d5aa20605d13fa3e222e7e1bf1b7b678a295f398 /net/ipv6 | |
| parent | ipv6: add a flag to get the flow label used remotly (diff) | |
| download | linux-6444f72b4b74f627c51891101e93ba2b94078b0a.tar.xz linux-6444f72b4b74f627c51891101e93ba2b94078b0a.zip | |
ipv6: add 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.
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>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/af_inet6.c | 1 | ||||
| -rw-r--r-- | net/ipv6/ip6_flowlabel.c | 7 | ||||
| -rw-r--r-- | net/ipv6/sysctl_net_ipv6.c | 8 |
3 files changed, 16 insertions, 0 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index c921d5d38831..d935889f1008 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.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 01bf2524c72a..dfa41bb4e0dc 100644 --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -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; } diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c index b51b2688102c..7f405a168822 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 = "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) |