ipv6: udp: make short packet logging consistent with ipv4

Adding addresses and ports to the short packet log message,
like ipv4/udp.c does it, makes these messages a lot more useful:

[  822.182450] UDPv6: short packet: From [2001:db8:ffb4:3::1]:47839 23715/178 to [2001:db8:ffb4:3:5054:ff:feff:200]:1234

This requires us to drop logging in case pskb_may_pull() fails,
which also is consistent with ipv4/udp.c

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 3 deletions

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 79359c8380bc..3d7a2c0b836a 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -699,7 +699,7 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
         u32 ulen = 0;
 
         if (!pskb_may_pull(skb, sizeof(struct udphdr)))
-                goto short_packet;
+                goto discard;
 
         saddr = &ipv6_hdr(skb)->saddr;
         daddr = &ipv6_hdr(skb)->daddr;
@@ -781,9 +781,14 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
         return 0;
 
 short_packet:
-        LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
+        LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
                        proto == IPPROTO_UDPLITE ? "-Lite" : "",
-                       ulen, skb->len);
+                       saddr,
+                       ntohs(uh->source),
+                       ulen,
+                       skb->len,
+                       daddr,
+                       ntohs(uh->dest));
 
 discard:
         UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);