path: root/net
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authorHeiner Kallweit <heiner.kallweit@web.de>2014-03-12 22:13:19 +0100
committerDavid S. Miller <davem@davemloft.net>2014-03-13 15:49:14 -0400
commitecab67015ef6e3f3635551dcc9971cf363cc1cd5 (patch)
treec91b67d0b541d7a1f9c436b43082b4c70913f189 /net
parent84fe61821e4ebab6322eeae3f3c27f77f0031978 (diff)
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>
Diffstat (limited to 'net')
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index fdbfeca36d6..344e972426d 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1103,8 +1103,11 @@ 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) {
ret = -1;