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[UDP]: Defer InDataGrams increment until recvmsg() does checksum

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Thanks dave, herbert, gerrit, andi and other people for your
discussion about this problem.

UdpInDatagrams can be confusing because it counts packets that
might be dropped later.
Move UdpInDatagrams into recvmsg() as allowed by the RFC.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wang Chen
2007-12-03 22:33:28 +11:00
committed by David S. Miller
parent 6859d49475
commit cb75994ec3
3 changed files with 7 additions and 6 deletions
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7
net/ipv4/udp.c
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@@ -873,6 +873,8 @@ try_again:
if (err)
goto out_free;
UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
sock_recv_timestamp(msg, sk, skb);
/* Copy the address. */
@@ -966,10 +968,8 @@ int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
int ret;
ret = (*up->encap_rcv)(sk, skb);
if (ret <= 0) {
UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
if (ret <= 0)
return -ret;
}
}
/* FALLTHROUGH -- it's a UDP Packet */
@@ -1023,7 +1023,6 @@ int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
goto drop;
}
UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
return 0;
drop: