From 4d8e931f164bdfef0d93f57ef181f6b9aa19dfc5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michal=20Kube=C4=8Dek?= <mkubecek@suse.cz>
Date: Tue, 3 Nov 2015 08:51:07 +0100
Subject: [PATCH] ipv6: fix tunnel error handling
commit ebac62fe3d24c0ce22dd83afa7b07d1a2aaef44d upstream.
Both tunnel6_protocol and tunnel46_protocol share the same error
handler, tunnel6_err(), which traverses through tunnel6_handlers list.
For ipip6 tunnels, we need to traverse tunnel46_handlers as we do e.g.
in tunnel46_rcv(). Current code can generate an ICMPv6 error message
with an IPv4 packet embedded in it.
Fixes: 73d605d1abbd ("[IPSEC]: changing API of xfrm6_tunnel_register")
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
net/ipv6/tunnel6.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/tunnel6.c b/net/ipv6/tunnel6.c
index 3c758007b327..dae25cad05cd 100644
--- a/net/ipv6/tunnel6.c
+++ b/net/ipv6/tunnel6.c
@@ -144,6 +144,16 @@ static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
break;
}
+static void tunnel46_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct xfrm6_tunnel *handler;
+
+ for_each_tunnel_rcu(tunnel46_handlers, handler)
+ if (!handler->err_handler(skb, opt, type, code, offset, info))
+ break;
+}
+
static const struct inet6_protocol tunnel6_protocol = {
.handler = tunnel6_rcv,
.err_handler = tunnel6_err,
@@ -152,7 +162,7 @@ static const struct inet6_protocol tunnel6_protocol = {
static const struct inet6_protocol tunnel46_protocol = {
.handler = tunnel46_rcv,
- .err_handler = tunnel6_err,
+ .err_handler = tunnel46_err,
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};
--
GitLab