[IPV6]: Add UDP_MIB_{SND,RCV}BUFERRORS handling.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 1 deletions

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 780b89f6dfcc..c813381020bc 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -345,6 +345,8 @@ out:
 
 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
 {
+        int rc;
+
         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
                 kfree_skb(skb);
                 return -1;
@@ -356,7 +358,10 @@ static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
                 return 0;
         }
 
-        if (sock_queue_rcv_skb(sk,skb)<0) {
+        if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
+                /* Note that an ENOMEM error is charged twice */
+                if (rc == -ENOMEM)
+                        UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS);
                 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
                 kfree_skb(skb);
                 return 0;
@@ -857,6 +862,16 @@ out:
                 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
                 return len;
         }
+        /*
+         * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space.  Reporting
+         * ENOBUFS might not be good (it's not tunable per se), but otherwise
+         * we don't have a good statistic (IpOutDiscards but it can be too many
+         * things).  We could add another new stat but at least for now that
+         * seems like overkill.
+         */
+        if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
+                UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS);
+        }
         return err;
 
 do_confirm: