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Commit 3b9f9a1c authored by Noriaki TAKAMIYA's avatar Noriaki TAKAMIYA Committed by David S. Miller
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[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: default avatarNoriaki TAKAMIYA <takamiya@po.ntts.co.jp>
Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 55ebaef1

include/linux/if_addr.h

+1 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ enum 
#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

include/net/addrconf.h

+1 −5
Original line number Diff line number Diff line
@@ -61,12 +61,8 @@ extern int addrconf_set_dstaddr(void __user *arg); 
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,

net/ipv6/addrconf.c

+41 −3
Original line number Diff line number Diff line
@@ -1038,9 +1038,27 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev, 
					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 @@ void if6_proc_exit(void) 
}

#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 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 
		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 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 
		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) {