diff options
Diffstat (limited to 'ipv6-Don-t-reduce-hop-limit-for-an-interface.patch')
| -rw-r--r-- | ipv6-Don-t-reduce-hop-limit-for-an-interface.patch | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/ipv6-Don-t-reduce-hop-limit-for-an-interface.patch b/ipv6-Don-t-reduce-hop-limit-for-an-interface.patch deleted file mode 100644 index 9b9448681..000000000 --- a/ipv6-Don-t-reduce-hop-limit-for-an-interface.patch +++ /dev/null @@ -1,46 +0,0 @@ -From: "D.S. Ljungmark" <ljungmark@modio.se> -Date: Wed, 25 Mar 2015 09:28:15 +0100 -Subject: [PATCH] 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> ---- - net/ipv6/ndisc.c | 9 ++++++++- - 1 file changed, 8 insertions(+), 1 deletion(-) - -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) - if (rt) - rt6_set_expires(rt, jiffies + (HZ * lifetime)); - if (ra_msg->icmph.icmp6_hop_limit) { -- in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; -+ /* Only set hop_limit on the interface if it is higher than -+ * the current hop_limit. -+ */ -+ if (in6_dev->cnf.hop_limit < ra_msg->icmph.icmp6_hop_limit) { -+ in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; -+ } else { -+ ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than current\n"); -+ } - if (rt) - dst_metric_set(&rt->dst, RTAX_HOPLIMIT, - ra_msg->icmph.icmp6_hop_limit); --- -2.1.0 - |