From: Ville Nuorvala <vnuorval@tcs.hut.fi>
Date: Sat, 25 Nov 2006 01:08:58 +0000 (-0800)
Subject: [IPV6]: Improve IPv6 tunnel error reporting
X-Git-Tag: v2.6.20-rc1~34^2~40^2~158
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=107a5fe6191249878de0de42bb64d3c35be1a986;p=linux-2.6

[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 <vnuorval@tcs.hut.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index daad1e5a2a..8d918348f5 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -424,12 +424,9 @@ ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 		}
 		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 inet6_skb_parm *opt,
 					       "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: