ipv6: introduce IFA_F_STABLE_PRIVACY flag

We need to mark appropriate addresses so we can do retries in case their
DAD failed.

Cc: Erik Kline <ek@google.com>
Cc: Fernando Gont <fgont@si6networks.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: YOSHIFUJI Hideaki/吉藤英明 <hideaki.yoshifuji@miraclelinux.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 6 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6813268ce8b8..c2357b6f62dd 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2199,6 +2199,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
         __u32 valid_lft;
         __u32 prefered_lft;
         int addr_type;
+        u32 addr_flags = 0;
         struct inet6_dev *in6_dev;
         struct net *net = dev_net(dev);
 
@@ -2309,6 +2310,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
                                    IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
                                    !ipv6_generate_stable_address(&addr, 0,
                                                                  in6_dev)) {
+                                addr_flags |= IFA_F_STABLE_PRIVACY;
                                 goto ok;
                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
@@ -2328,7 +2330,6 @@ ok:
 
                 if (ifp == NULL && valid_lft) {
                         int max_addresses = in6_dev->cnf.max_addresses;
-                        u32 addr_flags = 0;
 
 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
                         if (in6_dev->cnf.optimistic_dad &&
@@ -2807,10 +2808,11 @@ static void init_loopback(struct net_device *dev)
         }
 }
 
-static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
+static void addrconf_add_linklocal(struct inet6_dev *idev,
+                                   const struct in6_addr *addr, u32 flags)
 {
         struct inet6_ifaddr *ifp;
-        u32 addr_flags = IFA_F_PERMANENT;
+        u32 addr_flags = flags | IFA_F_PERMANENT;
 
 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
         if (idev->cnf.optimistic_dad &&
@@ -2818,7 +2820,6 @@ static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr
                 addr_flags |= IFA_F_OPTIMISTIC;
 #endif
 
-
         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
         if (!IS_ERR(ifp)) {
@@ -2916,7 +2917,8 @@ static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
 
         if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
                 if (!ipv6_generate_stable_address(&addr, 0, idev))
-                        addrconf_add_linklocal(idev, &addr);
+                        addrconf_add_linklocal(idev, &addr,
+                                               IFA_F_STABLE_PRIVACY);
                 else if (prefix_route)
                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
         } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
@@ -2925,7 +2927,7 @@ static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
                  * couldn't generate one.
                  */
                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
-                        addrconf_add_linklocal(idev, &addr);
+                        addrconf_add_linklocal(idev, &addr, 0);
                 else if (prefix_route)
                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
         }