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batman-adv: Fix DAT candidate selection on little endian systems 

commit 4cc4a1708903f404d2ca0dfde30e71e052c6cbc9 upstream.

The distributed arp table is using a DHT to store and retrieve MAC address
information for an IP address. This is done using unicast messages to
selected peers. The potential peers are looked up using the IP address and
the VID.

While the IP address is always stored in big endian byte order, this is not
the case of the VID. It can (depending on the host system) either be big
endian or little endian. The host must therefore always convert it to big
endian to ensure that all devices calculate the same peers for the same
lookup data.

Fixes: be1db4f661 ("batman-adv: make the Distributed ARP Table vlan aware")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sven Eckelmann 2019-11-28 12:25:45 +01:00 committed by Greg Kroah-Hartman
parent 2548a72a6f
commit 7c69f6a227
1 changed files with 3 additions and 1 deletions
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4
net/batman-adv/distributed-arp-table.c
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@ -285,6 +285,7 @@ static u32 batadv_hash_dat(const void *data, u32 size)
u32 hash = 0;
const struct batadv_dat_entry *dat = data;
const unsigned char *key;
__be16 vid;
u32 i;
key = (const unsigned char *)&dat->ip;
@ -294,7 +295,8 @@ static u32 batadv_hash_dat(const void *data, u32 size)
hash ^= (hash >> 6);
}
key = (const unsigned char *)&dat->vid;
vid = htons(dat->vid);
key = (__force const unsigned char *)&vid;
for (i = 0; i < sizeof(dat->vid); i++) {
hash += key[i];
hash += (hash << 10);