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[IPV6] ADDRCONF: Mobile IPv6 Home Address support.

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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>
This commit is contained in:
Noriaki TAKAMIYA 2006-09-22 14:45:56 -07:00 committed by David S. Miller
parent 55ebaef1d5
commit 3b9f9a1c39
3 changed files with 43 additions and 8 deletions
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1
include/linux/if_addr.h
View file

@ -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

6
include/net/addrconf.h
View file

@ -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,

44
net/ipv6/addrconf.c
View file

@ -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) {