ipv6: log src and dst along with "udp checksum is 0"

These info messages are rather pointless without any means to identify
the source of the bogus packets.  Logging the src and dst addresses and
ports may help a bit.

Cc: Joe Perches <joe@perches.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_checksum.c b/net/ipv6/ip6_checksum.c
index 72d198b8e4d2966d81fc5c183b12333e49e56d3f..ee7a97f510cbd9f94fa24eafa43ddba201c75f3e 100644 (file)
--- a/net/ipv6/ip6_checksum.c
+++ b/net/ipv6/ip6_checksum.c
@@ -79,7 +79,9 @@ int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
                /* RFC 2460 section 8.1 says that we SHOULD log
                   this error. Well, it is reasonable.
                 */
-               LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
+               LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
+                              &ipv6_hdr(skb)->saddr, ntohs(uh->source),
+                              &ipv6_hdr(skb)->daddr, ntohs(uh->dest));
                return 1;
        }
        if (skb->ip_summed == CHECKSUM_COMPLETE &&