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authorEric Dumazet <edumazet@google.com>2015-07-27 11:33:50 +0200
committerDavid S. Miller <davem@davemloft.net>2015-07-28 23:41:24 -0700
commit11c91ef98f37cd743098de26160fffd7f9bd40e1 (patch)
treefbac25bfba3cd3487b659d37cf31d5d9d5c7070a /net/ipv4/ah4.c
parent865b804244f228e80fb62abe464296399253cce8 (diff)
downloadlinux-11c91ef98f37cd743098de26160fffd7f9bd40e1.tar.bz2
arp: filter NOARP neighbours for SIOCGARP
When arp is off on a device, and ioctl(SIOCGARP) is queried, a buggy answer is given with MAC address of the device, instead of the mac address of the destination/gateway. We filter out NUD_NOARP neighbours for /proc/net/arp, we must do the same for SIOCGARP ioctl. Tested: lpaa23:~# ./arp 10.246.7.190 MAC=00:01:e8:22:cb:1d // correct answer lpaa23:~# ip link set dev eth0 arp off lpaa23:~# cat /proc/net/arp # check arp table is now 'empty' IP address HW type Flags HW address Mask Device lpaa23:~# ./arp 10.246.7.190 MAC=00:1a:11:c3:0d:7f // buggy answer before patch (this is eth0 mac) After patch : lpaa23:~# ip link set dev eth0 arp off lpaa23:~# ./arp 10.246.7.190 ioctl(SIOCGARP) failed: No such device or address Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Vytautas Valancius <valas@google.com> Cc: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ah4.c')
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