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ipv4: new ip_no_pmtu_disc mode to always discard incoming frag needed msgs

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This new mode discards all incoming fragmentation-needed notifications
as I guess was originally intended with this knob. To not break backward
compatibility too much, I only added a special case for mode 2 in the
receiving path.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa
2013-12-14 05:13:45 +01:00
committed by David S. Miller
parent 974eda11c5
commit cd174e67a6
2 changed files with 11 additions and 3 deletions
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4
net/ipv4/icmp.c
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@@ -705,7 +705,9 @@ static void icmp_unreach(struct sk_buff *skb)
case ICMP_PORT_UNREACH:
break;
case ICMP_FRAG_NEEDED:
if (net->ipv4.sysctl_ip_no_pmtu_disc) {
if (net->ipv4.sysctl_ip_no_pmtu_disc == 2) {
goto out;
} else if (net->ipv4.sysctl_ip_no_pmtu_disc) {
LIMIT_NETDEBUG(KERN_INFO pr_fmt("%pI4: fragmentation needed and DF set\n"),
&iph->daddr);
} else {