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authorD.S. Ljungmark <ljungmark@modio.se>2015-03-25 04:28:15 -0400
committerDavid S. Miller <davem@davemloft.net>2015-03-25 11:41:08 -0400
commit6fd99094de2b83d1d4c8457f2c83483b2828e75a (patch)
tree8cc339316cfde4b3fba16784a44ebff573f44078 /net/ipv6
parent1452db764c279f8b329f1b3b9469bd01d9e21afd (diff)
ipv6: Don't reduce hop limit for an interface
A local route may have a lower hop_limit set than global routes do. RFC 3756, Section 4.2.7, "Parameter Spoofing" > 1. The attacker includes a Current Hop Limit of one or another small > number which the attacker knows will cause legitimate packets to > be dropped before they reach their destination. > As an example, one possible approach to mitigate this threat is to > ignore very small hop limits. The nodes could implement a > configurable minimum hop limit, and ignore attempts to set it below > said limit. Signed-off-by: D.S. Ljungmark <ljungmark@modio.se> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ndisc.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 471ed24aabae..14ecdaf06bf7 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1218,7 +1218,14 @@ static void ndisc_router_discovery(struct sk_buff *skb)
1218 if (rt) 1218 if (rt)
1219 rt6_set_expires(rt, jiffies + (HZ * lifetime)); 1219 rt6_set_expires(rt, jiffies + (HZ * lifetime));
1220 if (ra_msg->icmph.icmp6_hop_limit) { 1220 if (ra_msg->icmph.icmp6_hop_limit) {
1221 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; 1221 /* Only set hop_limit on the interface if it is higher than
1222 * the current hop_limit.
1223 */
1224 if (in6_dev->cnf.hop_limit < ra_msg->icmph.icmp6_hop_limit) {
1225 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1226 } else {
1227 ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than current\n");
1228 }
1222 if (rt) 1229 if (rt)
1223 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 1230 dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
1224 ra_msg->icmph.icmp6_hop_limit); 1231 ra_msg->icmph.icmp6_hop_limit);