diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2016-02-04 13:31:18 +0100 |
|---|---|---|
| committer | Michael Bestas <mkbestas@lineageos.org> | 2019-12-23 23:43:37 +0200 |
| commit | d3f2cb3d4d3007b74d28c3fc6f9476243730a28e (patch) | |
| tree | 5b985e9cffd9e58a56627af6a104042ddcb2dd78 /net/ipv4/arp.c | |
| parent | 1a47124756646bf3f42eab939adccba186ec63bf (diff) | |
ipv4: add option to drop gratuitous ARP packets
In certain 802.11 wireless deployments, there will be ARP proxies
that use knowledge of the network to correctly answer requests.
To prevent gratuitous ARP frames on the shared medium from being
a problem, on such deployments wireless needs to drop them.
Enable this by providing an option called "drop_gratuitous_arp".
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 4078228159c9f54cca7347a8bdace29f2abdef65)
Change-Id: I8772dbd7471085878f8b4161eb2a056d79b8b232
Diffstat (limited to 'net/ipv4/arp.c')
| -rw-r--r-- | net/ipv4/arp.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index bfa79831873f..f1e30ff3cfd7 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -743,6 +743,14 @@ static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb) goto out; /* + * For some 802.11 wireless deployments (and possibly other networks), + * there will be an ARP proxy and gratuitous ARP frames are attacks + * and thus should not be accepted. + */ + if (sip == tip && IN_DEV_ORCONF(in_dev, DROP_GRATUITOUS_ARP)) + goto out; + +/* * Special case: We must set Frame Relay source Q.922 address */ if (dev_type == ARPHRD_DLCI) |