Messages in this thread Patch in this message | | | Date | Mon, 18 Aug 2008 11:43:40 -0700 | From | Greg KH <> | Subject | [patch 27/60] ipv6: Fix ip6_xmit to send fragments if ipfragok is true |
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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 */ --
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