[IPV6]: Don't select a tentative address as a source address.

A tentative address is not considered "assigned to an interface"
in the traditional sense (RFC2462 Section 4).
Don't try to select such an address for the source address.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f6ead6a843e3..fd03c3944366 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -908,11 +908,18 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 
                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 
-                        /* Rule 0: Candidate Source Address (section 4)
+                        /* Rule 0:
+                         * - Tentative Address (RFC2462 section 5.4)
+                         *  - A tentative address is not considered
+                         *    "assigned to an interface" in the traditional
+                         *    sense.
+                         * - Candidate Source Address (section 4)
                          *  - In any case, anycast addresses, multicast
                          *    addresses, and the unspecified address MUST
                          *    NOT be included in a candidate set.
                          */
+                        if (ifa->flags & IFA_F_TENTATIVE)
+                                continue;
                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
                                 LIMIT_NETDEBUG(KERN_DEBUG