From: Heiner Kallweit Date: Wed, 12 Mar 2014 21:13:19 +0000 (+0100) Subject: ipv6: Avoid unnecessary temporary addresses being generated X-Git-Tag: firefly_0821_release~3679^2~2524 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9b12db3dd5abcf63b452296f34440dbdff6c16e5;p=firefly-linux-kernel-4.4.55.git ipv6: Avoid unnecessary temporary addresses being generated [ 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index b78a3ee93d52..7bcdd0df68db 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -1111,8 +1111,11 @@ 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;