[IPV6] ADDRCONF: Optimistic Duplicate Address Detection (RFC 4429) Support.

Nominally an autoconfigured IPv6 address is added to an interface in the
Tentative state (as per RFC 2462).  Addresses in this state remain in this
state while the Duplicate Address Detection process operates on them to
determine their uniqueness on the network.  During this period, these
tentative addresses may not be used for communication, increasing the time
before a node may be able to communicate on a network.  Using Optimistic
Duplicate Address Detection, autoconfigured addresses may be used
immediately for communication on the network, as long as certain rules are
followed to avoid conflicts with other nodes during the Duplicate Address
Detection process.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index a8d6625ec782..924e24907c3e 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1411,7 +1411,7 @@ static struct sk_buff *mld_newpack(struct net_device *dev, int size)
 
         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 
-        if (ipv6_get_lladdr(dev, &addr_buf)) {
+        if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
                 /* <draft-ietf-magma-mld-source-05.txt>:
                  * use unspecified address as the source address
                  * when a valid link-local address is not available.
@@ -1791,7 +1791,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
 
         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 
-        if (ipv6_get_lladdr(dev, &addr_buf)) {
+        if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
                 /* <draft-ietf-magma-mld-source-05.txt>:
                  * use unspecified address as the source address
                  * when a valid link-local address is not available.