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ipv6 sit: Set relay to 0.0.0.0 directly if relay_prefixlen == 0. 

ipv6 sit: Set relay to 0.0.0.0 directly if relay_prefixlen == 0.

Do not use bit-shift if relay_prefixlen == 0;
relay_prefix << 32 does not result in 0.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2009-10-11 03:45:13 +00:00 committed by David S. Miller
parent e7db38c38f
commit 91b2a3f9bb
1 changed files with 6 additions and 3 deletions
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9
net/ipv6/sit.c
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@ -1014,9 +1014,12 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
ip6rd.prefixlen);
if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
goto done;
relay_prefix = ip6rd.relay_prefix &
htonl(0xffffffffUL <<
(32 - ip6rd.relay_prefixlen));
if (ip6rd.relay_prefixlen)
relay_prefix = ip6rd.relay_prefix &
htonl(0xffffffffUL <<
(32 - ip6rd.relay_prefixlen));
else
relay_prefix = 0;
if (relay_prefix != ip6rd.relay_prefix)
goto done;