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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-12-14 05:13:45 +0100
committerDavid S. Miller <davem@davemloft.net>2013-12-18 16:58:20 -0500
commitcd174e67a6b312fce9bab502ba2b0583e11f537f (patch)
tree992dc562f0562abdf9d549c1d06725f001270570 /net/ipv4/icmp.c
parent974eda11c54290a1be8f8b155edae7d791e5ce57 (diff)
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ipv4: new ip_no_pmtu_disc mode to always discard incoming frag needed msgs
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>
Diffstat (limited to 'net/ipv4/icmp.c')
-rw-r--r--net/ipv4/icmp.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 1a4ee84ca3f3..fb3c5637199d 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -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 {