lkml.org 
[lkml]   [2008]   [Aug]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch 27/60] ipv6: Fix ip6_xmit to send fragments if ipfragok is true
From: Wei Yongjun <yjwei@cn.fujitsu.com>

[ Upstream commit 77e2f14f71d68d05945f1d30ca55b5194d6ab1ce ]

SCTP used ip6_xmit() to send fragments after received ICMP packet too
big message. But while send packet used ip6_xmit, the skb->local_df is
not initialized. So when skb if enter ip6_fragment(), the following
code will discard the skb.

ip6_fragment(...)
{
if (!skb->local_df) {
...
return -EMSGSIZE;
}
...
}

SCTP do the following step:
1. send packet ip6_xmit(skb, ipfragok=0)
2. received ICMP packet too big message
3. if PMTUD_ENABLE: ip6_xmit(skb, ipfragok=1)

This patch fixed the problem by set local_df if ipfragok is true.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
net/ipv6/ip6_output.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -231,6 +231,10 @@ int ip6_xmit(struct sock *sk, struct sk_
skb_reset_network_header(skb);
hdr = ipv6_hdr(skb);

+ /* Allow local fragmentation. */
+ if (ipfragok)
+ skb->local_df = 1;
+
/*
* Fill in the IPv6 header
*/
--


\
 
 \ /
  Last update: 2008-08-18 21:07    [W:0.224 / U:0.976 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site