Commit ecab6701 authored by Heiner Kallweit's avatar Heiner Kallweit Committed by David S. Miller

ipv6: Avoid unnecessary temporary addresses being generated

tmp_prefered_lft is an offset to ifp->tstamp, not now. Therefore
age needs to be added to the condition.

Age calculation in ipv6_create_tempaddr is different from the one
in addrconf_verify and doesn't consider ADDRCONF_TIMER_FUZZ_MINUS.
This can cause age in ipv6_create_tempaddr to be less than the one
in addrconf_verify and therefore unnecessary temporary address to
be generated.
Use age calculation as in addrconf_modify to avoid this.
Signed-off-by: default avatarHeiner Kallweit <heiner.kallweit@web.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 84fe6182
......@@ -1103,8 +1103,11 @@ static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *i
* Lifetime is greater than REGEN_ADVANCE time units. In particular,
* an implementation must not create a temporary address with a zero
* Preferred Lifetime.
* Use age calculation as in addrconf_verify to avoid unnecessary
* temporary addresses being generated.
*/
if (tmp_prefered_lft <= regen_advance) {
age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
if (tmp_prefered_lft <= regen_advance + age) {
in6_ifa_put(ifp);
in6_dev_put(idev);
ret = -1;
......
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