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ipv6: Compare addresses only bits up to the prefix length (RFC6724). 

Compare bits up to the source address's prefix length only to
allows DNS load balancing to continue to be used as a tie breaker.

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 2012-09-10 18:41:07 +00:00 committed by David S. Miller
parent 417962a02b
commit 91b4b04ff8
1 changed files with 4 additions and 2 deletions
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6
net/ipv6/addrconf.c
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@ -1070,8 +1070,10 @@ static int ipv6_get_saddr_eval(struct net *net,
break;
case IPV6_SADDR_RULE_PREFIX:
/* Rule 8: Use longest matching prefix */
score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
dst->addr);
ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
if (ret > score->ifa->prefix_len)
ret = score->ifa->prefix_len;
score->matchlen = ret;
break;
default:
ret = 0;