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-rw-r--r--net/ipv6/ndisc.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 84afb9a..c245895 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -883,6 +883,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
offsetof(struct nd_msg, opt));
struct ndisc_options ndopts;
struct net_device *dev = skb->dev;
+ struct inet6_dev *idev = __in6_dev_get(dev);
struct inet6_ifaddr *ifp;
struct neighbour *neigh;
@@ -902,6 +903,14 @@ static void ndisc_recv_na(struct sk_buff *skb)
return;
}
+ /* For some 802.11 wireless deployments (and possibly other networks),
+ * there will be a NA proxy and unsolicitd packets are attacks
+ * and thus should not be accepted.
+ */
+ if (!msg->icmph.icmp6_solicited && idev &&
+ idev->cnf.drop_unsolicited_na)
+ return;
+
if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
ND_PRINTK(2, warn, "NS: invalid ND option\n");
return;
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