ipv6: Fix getsockopt() for sockets with default IPV6_AUTOFLOWLABEL

[ Upstream commit e9191ffb65d8e159680ce0ad2224e1acbde6985c ]

Commit 513674b5a2c9 ("net: reevalulate autoflowlabel setting after
sysctl setting") removed the initialisation of
ipv6_pinfo::autoflowlabel and added a second flag to indicate
whether this field or the net namespace default should be used.

The getsockopt() handling for this case was not updated, so it
currently returns 0 for all sockets for which IPV6_AUTOFLOWLABEL is
not explicitly enabled.  Fix it to return the effective value, whether
that has been set at the socket or net namespace level.

Fixes: 513674b5a2c9 ("net: reevalulate autoflowlabel setting after sysctl ...")
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 35e9dd2d18baa4b5a33c8653b4b402090eab3dc6..9596aa93d6ef3e9de9a16e27e699c200dcb3f483 100644 (file)
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -291,6 +291,7 @@ int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
                           int flags);
 int ip6_flowlabel_init(void);
 void ip6_flowlabel_cleanup(void);
+bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
 
 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 {

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 688ba5f7516b37c87b879036dce781bdcfa01739..08446e0ca411fe5bcfcb5724a0db426f4060364e 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -166,7 +166,7 @@ int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
                            !(IP6CB(skb)->flags & IP6SKB_REROUTED));
 }
 
-static bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np)
+bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np)
 {
        if (!np->autoflowlabel_set)
                return ip6_default_np_autolabel(net);

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 90dbfa78a39075be9dacc3a8f1e881f6e8a1ff2f..3b251760cb8c34b157366d5c4a3055d7198cc36c 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -1324,7 +1324,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                break;
 
        case IPV6_AUTOFLOWLABEL:
-               val = np->autoflowlabel;
+               val = ip6_autoflowlabel(sock_net(sk), np);
                break;
 
        case IPV6_RECVFRAGSIZE: