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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: Heiner Kallweit <heiner.kallweit@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2014-03-12 22:13:19 +01:00 committed by David S. Miller
parent 84fe61821e
commit ecab67015e
1 changed files with 4 additions and 1 deletions
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5
net/ipv6/addrconf.c
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@ -1103,8 +1103,11 @@ retry:
* Lifetime is greater than REGEN_ADVANCE time units. In particular, * Lifetime is greater than REGEN_ADVANCE time units. In particular,
* an implementation must not create a temporary address with a zero * an implementation must not create a temporary address with a zero
* Preferred Lifetime. * 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_ifa_put(ifp);
in6_dev_put(idev); in6_dev_put(idev);
ret = -1; ret = -1;