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authorYOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>2009-10-11 03:45:13 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-11 23:41:10 -0700
commit91b2a3f9bb0fa8d64b365a10b0624b0341e1a338 (patch)
tree0152d7f1a7a38b74d6d55085fc34d01f86635e70
parente7db38c38fe8df1d890ae772737e27308bdc5956 (diff)
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>
-rw-r--r--net/ipv6/sit.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 193d0c6c5ce2..510d31f3cb96 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -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;

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