From: Heiner Kallweit <heiner.kallweit@xxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit ecab67015ef6e3f3635551dcc9971cf363cc1cd5 ]
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@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
net/ipv6/addrconf.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index cd3fb301da38..5dac9fd72465 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1079,8 +1079,11 @@ retry:
* 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;
--
1.9.2
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