[IPV6] ADDRCONF: Mobile IPv6 Home Address support.
IFA_F_HOMEADDRESS is introduced for Mobile IPv6 Home Addresses on
Mobile Node.
The IFA_F_HOMEADDRESS flag should be set for Mobile IPv6 Home
Addresses for 2 purposes. 1) We need to check this on receipt of
Type 2 Routing Header (RFC3775 Secion 6.4), 2) We prefer Home
Address(es) in source address selection (RFC3484 Section 5 Rule 4).
Signed-off-by: Noriaki TAKAMIYA <takamiya@po.ntts.co.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_addr.h b/include/linux/if_addr.h
index ca24b9d..dbe8f61 100644
--- a/include/linux/if_addr.h
+++ b/include/linux/if_addr.h
@@ -39,6 +39,7 @@
#define IFA_F_TEMPORARY IFA_F_SECONDARY
#define IFA_F_NODAD 0x02
+#define IFA_F_HOMEADDRESS 0x10
#define IFA_F_DEPRECATED 0x20
#define IFA_F_TENTATIVE 0x40
#define IFA_F_PERMANENT 0x80
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index aa2ed8f..44f1b67 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -61,12 +61,8 @@
extern int ipv6_chk_addr(struct in6_addr *addr,
struct net_device *dev,
int strict);
-/* XXX: this is a placeholder till addrconf supports */
#ifdef CONFIG_IPV6_MIP6
-static inline int ipv6_chk_home_addr(struct in6_addr *addr)
-{
- return 0;
-}
+extern int ipv6_chk_home_addr(struct in6_addr *addr);
#endif
extern struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr,
struct net_device *dev,
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index adb583a..c186763 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1038,9 +1038,27 @@
continue;
}
- /* Rule 4: Prefer home address -- not implemented yet */
+ /* Rule 4: Prefer home address */
+#ifdef CONFIG_IPV6_MIP6
+ if (hiscore.rule < 4) {
+ if (ifa_result->flags & IFA_F_HOMEADDRESS)
+ hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
+ hiscore.rule++;
+ }
+ if (ifa->flags & IFA_F_HOMEADDRESS) {
+ score.attrs |= IPV6_SADDR_SCORE_HOA;
+ if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
+ score.rule = 4;
+ goto record_it;
+ }
+ } else {
+ if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
+ continue;
+ }
+#else
if (hiscore.rule < 4)
hiscore.rule++;
+#endif
/* Rule 5: Prefer outgoing interface */
if (hiscore.rule < 5) {
@@ -2759,6 +2777,26 @@
}
#endif /* CONFIG_PROC_FS */
+#ifdef CONFIG_IPV6_MIP6
+/* Check if address is a home address configured on any interface. */
+int ipv6_chk_home_addr(struct in6_addr *addr)
+{
+ int ret = 0;
+ struct inet6_ifaddr * ifp;
+ u8 hash = ipv6_addr_hash(addr);
+ read_lock_bh(&addrconf_hash_lock);
+ for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
+ if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
+ (ifp->flags & IFA_F_HOMEADDRESS)) {
+ ret = 1;
+ break;
+ }
+ }
+ read_unlock_bh(&addrconf_hash_lock);
+ return ret;
+}
+#endif
+
/*
* Periodic address status verification
*/
@@ -2930,7 +2968,7 @@
prefered_lft = 0x7FFFFFFF/HZ;
spin_lock_bh(&ifp->lock);
- ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD)) | ifa_flags;
+ ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
ifp->tstamp = jiffies;
ifp->valid_lft = valid_lft;
ifp->prefered_lft = prefered_lft;
@@ -2981,7 +3019,7 @@
return -ENODEV;
/* We ignore other flags so far. */
- ifa_flags = ifm->ifa_flags & IFA_F_NODAD;
+ ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
ifa = ipv6_get_ifaddr(pfx, dev, 1);
if (ifa == NULL) {