[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>

1 files changed, 7 insertions, 6 deletions

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index daad1e5a2a85..8d918348f5bb 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: