From a18135eb9389c26d36ef5c05bd8bc526e0cbe883 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@sunset.davemloft.net>
Date: Tue, 15 Aug 2006 00:00:09 -0700
Subject: [PATCH] [IPV6]: Add UDP_MIB_{SND,RCV}BUFERRORS handling.
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv6/udp.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
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:
--
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