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

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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2012-09-10 18:41:07 +00:00 • committed by David S. Miller
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;