linux-kernel - [RFC/PATCH] SO_NO

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Message-ID: <20071121124532.GA17263@havoc.gtf.org>
Date:	Wed, 21 Nov 2007 07:45:32 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	netdev@...r.kernel.org
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [RFC/PATCH] SO_NO_CHECK for IPv6


SO_NO_CHECK support for IPv6 appeared to be missing. This is presented,
based on a reading of net/ipv4/udp.c.

I wonder if IPv4's CHECKSUM_PARTIAL check from udp_push_pending_frames()
also needs to be copied to IPv6?

Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
---
 net/ipv6/udp.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ee1cc3f..7927e69 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -538,9 +538,14 @@ static int udp_v6_push_pending_frames(struct sock *sk)
 	uh->len = htons(up->len);
 	uh->check = 0;
 
-	if (up->pcflag)
+	if (up->pcflag)					/*     UDP-Lite      */
 		csum = udplite_csum_outgoing(sk, skb);
-	 else
+
+	else if (sk->sk_no_check == UDP_CSUM_NOXMIT) {	/* UDP csum disabled */
+		skb->ip_summed = CHECKSUM_NONE;
+		goto send;
+
+	} else
 		csum = udp_csum_outgoing(sk, skb);
 
 	/* add protocol-dependent pseudo-header */
@@ -549,6 +554,7 @@ static int udp_v6_push_pending_frames(struct sock *sk)
 	if (uh->check == 0)
 		uh->check = CSUM_MANGLED_0;
 
+send:
 	err = ip6_push_pending_frames(sk);
 out:
 	up->len = 0;
-
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