From d66a8acbda926fa2398ae930f50787e8663bce96 Mon Sep 17 00:00:00 2001
From: Piotr Sawicki <p.sawicki2@partner.samsung.com>
Date: Thu, 19 Jul 2018 11:47:31 +0200
Subject: [PATCH] Smack: Inform peer that IPv6 traffic has been blocked

In this patch we're sending an ICMPv6 message to a peer to
immediately inform it that making a connection is not possible.
In case of TCP connections, without this change, the peer
will be waiting until a connection timeout is exceeded.

Signed-off-by: Piotr Sawicki <p.sawicki2@partner.samsung.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 security/smack/smack_lsm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index aff8397e8c7e..91750205a5de 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -28,6 +28,7 @@
 #include <linux/tcp.h>
 #include <linux/udp.h>
 #include <linux/dccp.h>
+#include <linux/icmpv6.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/pipe_fs_i.h>
@@ -4009,6 +4010,9 @@ access_check:
 #ifdef SMACK_IPV6_PORT_LABELING
 		rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
 #endif /* SMACK_IPV6_PORT_LABELING */
+		if (rc != 0)
+			icmpv6_send(skb, ICMPV6_DEST_UNREACH,
+					ICMPV6_ADM_PROHIBITED, 0);
 		break;
 #endif /* CONFIG_IPV6 */
 	}