l2tp: show IPv6 addresses in l2tp debugfs file

If an L2TP tunnel uses IPv6, make sure the l2tp debugfs file shows the
IPv6 address correctly.

Signed-off-by: Chris Elston <celston@katalix.com>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c
index 76130134bfa6..c0d57bad8b79 100644
--- a/net/l2tp/l2tp_debugfs.c
+++ b/net/l2tp/l2tp_debugfs.c
@@ -122,6 +122,14 @@ static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
         seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id);
         if (tunnel->sock) {
                 struct inet_sock *inet = inet_sk(tunnel->sock);
+
+#if IS_ENABLED(CONFIG_IPV6)
+                if (tunnel->sock->sk_family == AF_INET6) {
+                        struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
+                        seq_printf(m, " from %pI6c to %pI6c\n",
+                                &np->saddr, &np->daddr);
+                } else
+#endif
                 seq_printf(m, " from %pI4 to %pI4\n",
                            &inet->inet_saddr, &inet->inet_daddr);
                 if (tunnel->encap == L2TP_ENCAPTYPE_UDP)