[IPV6]: Support Source Address Selection API (RFC5014).

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

1 files changed, 14 insertions, 3 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 787e90af166c..89954885dee1 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -909,6 +909,7 @@ struct ipv6_saddr_dst {
         int ifindex;
         int scope;
         int label;
+        unsigned int prefs;
 };
 
 static inline int ipv6_saddr_preferred(int type)
@@ -984,9 +985,12 @@ static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
                 break;
 #ifdef CONFIG_IPV6_MIP6
         case IPV6_SADDR_RULE_HOA:
+            {
                 /* Rule 4: Prefer home address */
-                ret = !!(score->ifa->flags & IFA_F_HOMEADDRESS);
+                int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
+                ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
                 break;
+            }
 #endif
         case IPV6_SADDR_RULE_OIF:
                 /* Rule 5: Prefer outgoing interface */
@@ -1000,11 +1004,16 @@ static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
                 break;
 #ifdef CONFIG_IPV6_PRIVACY
         case IPV6_SADDR_RULE_PRIVACY:
+            {
                 /* Rule 7: Prefer public address
                  * Note: prefer temprary address if use_tempaddr >= 2
                  */
-                ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ (score->ifa->idev->cnf.use_tempaddr >= 2);
+                int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
+                                !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
+                                score->ifa->idev->cnf.use_tempaddr >= 2;
+                ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
                 break;
+            }
 #endif
         case IPV6_SADDR_RULE_ORCHID:
                 /* Rule 8-: Prefer ORCHID vs ORCHID or
@@ -1030,7 +1039,8 @@ out:
 }
 
 int ipv6_dev_get_saddr(struct net_device *dst_dev,
-                       struct in6_addr *daddr, struct in6_addr *saddr)
+                       struct in6_addr *daddr, unsigned int prefs,
+                       struct in6_addr *saddr)
 {
         struct ipv6_saddr_score scores[2],
                                 *score = &scores[0], *hiscore = &scores[1];
@@ -1044,6 +1054,7 @@ int ipv6_dev_get_saddr(struct net_device *dst_dev,
         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
         dst.scope = __ipv6_addr_src_scope(dst_type);
         dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
+        dst.prefs = prefs;
 
         hiscore->rule = -1;
         hiscore->ifa = NULL;