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ipv4: add option to drop gratuitous ARP packets

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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>
This commit is contained in:
Johannes Berg
2016-02-04 13:31:18 +01:00
committed by David S. Miller
parent 12b74dfadb
commit 97daf33145
4 changed files with 17 additions and 0 deletions
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6
Documentation/networking/ip-sysctl.txt
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@@ -1223,6 +1223,12 @@ drop_unicast_in_l2_multicast - BOOLEAN
1122, but is disabled by default for compatibility reasons.
Default: off (0)
drop_gratuitous_arp - BOOLEAN
Drop all gratuitous ARP frames, for example if there's a known
good ARP proxy on the network and such frames need not be used
(or in the case of 802.11, must not be used to prevent attacks.)
Default: off (0)
tag - INTEGER
Allows you to write a number, which can be used as required.