netdev - Re: [IPV6]: Fix IPsec datagram fragmentation

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Date:	Fri, 15 Feb 2008 14:22:15 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Bill Fink <billfink@...dspring.com>
Cc:	David Miller <davem@...emloft.net>, yoshfuji@...ux-ipv6.org,
	netdev@...r.kernel.org, dlstevens@...ibm.com, kazunori@...azawa.org
Subject: Re: [IPV6]: Fix IPsec datagram fragmentation

On Fri, Feb 15, 2008 at 01:13:13AM -0500, Bill Fink wrote:
>
> I think the setting of skb->local_def is still backwards in your
> original patch:

You're quite right.  Thanks for pointing this out!

[IPV6]: Fix reversed local_df test in ip6_fragment

I managed to reverse the local_df test when forward-porting this
patch so it actually makes things worse by never fragmenting at
all.

Thanks to David Stevens for testing and reporting this bug.

Bill Fink pointed out that the local_df setting is also the wrong
way around.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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--
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 4e9a2fe..8b67ca0 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -621,7 +621,7 @@ static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
 	 * or if the skb it not generated by a local socket.  (This last
 	 * check should be redundant, but it's free.)
 	 */
-	if (skb->local_df) {
+	if (!skb->local_df) {
 		skb->dev = skb->dst->dev;
 		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
 		IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
@@ -1421,7 +1421,7 @@ int ip6_push_pending_frames(struct sock *sk)
 	}
 
 	/* Allow local fragmentation. */
-	if (np->pmtudisc >= IPV6_PMTUDISC_DO)
+	if (np->pmtudisc < IPV6_PMTUDISC_DO)
 		skb->local_df = 1;
 
 	ipv6_addr_copy(final_dst, &fl->fl6_dst);
--
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