Wei Yongjun <[EMAIL PROTECTED]> wrote:
> When received ICMP Fragmentation Needed message, PATH MTU is always set
> to the 576 even if MTU in ICMP message is lager then 576. This is
> because of error condition in function ip_rt_frag_needed(), now if
> packet size of that ICMP message is less then new MTU, packet size will
> be used ,but RFC says ICMP error message return as much as we can
> without exceeding 576 bytes.
>
> This patch has Fixed this BUG.
>
> Signed-off-by: Wei Yongjun <[EMAIL PROTECTED]>
>
> --- net/ipv4/route.c.orig 2007-05-25 05:22:47.000000000 +0800
> +++ net/ipv4/route.c 2007-06-01 11:42:55.000000000 +0800
> @@ -1424,7 +1424,7 @@ unsigned short ip_rt_frag_needed(struct
> !(dst_metric_locked(&rth->u.dst, RTAX_MTU))) {
> unsigned short mtu = new_mtu;
>
> - if (new_mtu < 68 || new_mtu >= old_mtu) {
> + if (new_mtu < 68) {
>
> /* BSD 4.2 compatibility hack :-( */
Huh? The test new_mtu >= old_mtu should only hold if the sending router
is buggy which is what the hack is for.
Cheers,
--
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