Subject: [PATCH 5/6] IPv6: Improve IPv6 tunnel error reporting

From: Ville Nuorvala <[email-masked]>
Date: Thu, 02 Nov 2006 13:37:29 +0200

>>From 6b9b468f1cf3f2897fbcda389e8c2514a69c4943 Mon Sep 17 00:00:00 2001
From: Ville Nuorvala <[email-masked]>
Date: Thu, 2 Nov 2006 12:49:47 +0200
Subject: [PATCH 5/6] IPv6: Improve IPv6 tunnel error reporting

Log an error if the remote tunnel endpoint is unable to handle
tunneled packets.

Signed-off-by: Ville Nuorvala <[email-masked]>
---
 net/ipv6/ip6_tunnel.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index a97eb52..4f64ed7 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -424,12 +424,9 @@ ip6ip6_err(struct sk_buff *skb, struct i
 		}
 		break;
 	case ICMPV6_PARAMPROB:
-		/* ignore if parameter problem not caused by a tunnel
-		   encapsulation limit sub-option */
-		if (code != ICMPV6_HDR_FIELD) {
-			break;
-		}
-		teli = parse_tlv_tnl_enc_lim(skb, skb->data);
+		teli = 0;
+		if (code == ICMPV6_HDR_FIELD)
+			teli = parse_tlv_tnl_enc_lim(skb, skb->data);
 
 		if (teli && teli == ntohl(info) - 2) {
 			tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
@@ -441,6 +438,10 @@ ip6ip6_err(struct sk_buff *skb, struct i
 					       "tunnel!\n", t->parms.name);
 				rel_msg = 1;
 			}
+		} else if (net_ratelimit()) {
+			printk(KERN_WARNING
+			       "%s: Recipient unable to parse tunneled "
+			       "packet!\n ", t->parms.name);
 		}
 		break;
 	case ICMPV6_PKT_TOOBIG:
-- 
1.4.3.2