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linux-sg2042
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ipv6: Replace inet6_ifaddr->dead with state 

This patch replaces the boolean dead flag on inet6_ifaddr with
a state enum.  This allows us to roll back changes when deleting
an address according to whether DAD has completed or not.

This patch only adds the state field and does not change the logic.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2010-05-18 15:36:06 -07:00 committed by David S. Miller
parent e29f5dbc9e
commit e9d3e08497
2 changed files with 19 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/net/if_inet6.h
View File

@ -32,6 +32,13 @@
#ifdef __KERNEL__ #ifdef __KERNEL__
enum {
INET6_IFADDR_STATE_DAD,
INET6_IFADDR_STATE_POSTDAD,
INET6_IFADDR_STATE_UP,
INET6_IFADDR_STATE_DEAD,
};
struct inet6_ifaddr { struct inet6_ifaddr {
struct in6_addr addr; struct in6_addr addr;
__u32 prefix_len; __u32 prefix_len;
@ -40,6 +47,9 @@ struct inet6_ifaddr {
__u32 prefered_lft; __u32 prefered_lft;
atomic_t refcnt; atomic_t refcnt;
spinlock_t lock; spinlock_t lock;
spinlock_t state_lock;
int state;
__u8 probes; __u8 probes;
__u8 flags; __u8 flags;
@ -62,8 +72,6 @@ struct inet6_ifaddr {
struct inet6_ifaddr *ifpub; struct inet6_ifaddr *ifpub;
int regen_count; int regen_count;
#endif #endif
int dead;
struct rcu_head rcu; struct rcu_head rcu;
}; };

16
net/ipv6/addrconf.c
View File

@ -553,7 +553,7 @@ void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
if (del_timer(&ifp->timer)) if (del_timer(&ifp->timer))
pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
if (!ifp->dead) { if (ifp->state != INET6_IFADDR_STATE_DEAD) {
pr_warning("Freeing alive inet6 address %p\n", ifp); pr_warning("Freeing alive inet6 address %p\n", ifp);
return; return;
} }
@ -648,6 +648,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
ipv6_addr_copy(&ifa->addr, addr); ipv6_addr_copy(&ifa->addr, addr);
spin_lock_init(&ifa->lock); spin_lock_init(&ifa->lock);
spin_lock_init(&ifa->state_lock);
init_timer(&ifa->timer); init_timer(&ifa->timer);
INIT_HLIST_NODE(&ifa->addr_lst); INIT_HLIST_NODE(&ifa->addr_lst);
ifa->timer.data = (unsigned long) ifa; ifa->timer.data = (unsigned long) ifa;
@ -720,7 +721,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
hash = ipv6_addr_hash(&ifp->addr); hash = ipv6_addr_hash(&ifp->addr);
ifp->dead = 1; ifp->state = INET6_IFADDR_STATE_DEAD;
spin_lock_bh(&addrconf_hash_lock); spin_lock_bh(&addrconf_hash_lock);
hlist_del_init_rcu(&ifp->addr_lst); hlist_del_init_rcu(&ifp->addr_lst);
@ -2665,7 +2666,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
ifa = list_first_entry(&idev->tempaddr_list, ifa = list_first_entry(&idev->tempaddr_list,
struct inet6_ifaddr, tmp_list); struct inet6_ifaddr, tmp_list);
list_del(&ifa->tmp_list); list_del(&ifa->tmp_list);
ifa->dead = 1; ifa->state = INET6_IFADDR_STATE_DEAD;
write_unlock_bh(&idev->lock); write_unlock_bh(&idev->lock);
spin_lock_bh(&ifa->lock); spin_lock_bh(&ifa->lock);
@ -2707,7 +2708,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
write_unlock_bh(&idev->lock); write_unlock_bh(&idev->lock);
} else { } else {
list_del(&ifa->if_list); list_del(&ifa->if_list);
ifa->dead = 1; ifa->state = INET6_IFADDR_STATE_DEAD;
write_unlock_bh(&idev->lock); write_unlock_bh(&idev->lock);
/* clear hash table */ /* clear hash table */
@ -2717,7 +2718,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
} }
__ipv6_ifa_notify(RTM_DELADDR, ifa); __ipv6_ifa_notify(RTM_DELADDR, ifa);
if (ifa->dead) if (ifa->state == INET6_IFADDR_STATE_DEAD)
atomic_notifier_call_chain(&inet6addr_chain, atomic_notifier_call_chain(&inet6addr_chain,
NETDEV_DOWN, ifa); NETDEV_DOWN, ifa);
in6_ifa_put(ifa); in6_ifa_put(ifa);
@ -2815,7 +2816,7 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
net_srandom(ifp->addr.s6_addr32[3]); net_srandom(ifp->addr.s6_addr32[3]);
read_lock_bh(&idev->lock); read_lock_bh(&idev->lock);
if (ifp->dead) if (ifp->state == INET6_IFADDR_STATE_DEAD)
goto out; goto out;
spin_lock(&ifp->lock); spin_lock(&ifp->lock);
@ -4050,7 +4051,8 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
addrconf_leave_solict(ifp->idev, &ifp->addr); addrconf_leave_solict(ifp->idev, &ifp->addr);
dst_hold(&ifp->rt->u.dst); dst_hold(&ifp->rt->u.dst);
if (ifp->dead && ip6_del_rt(ifp->rt)) if (ifp->state == INET6_IFADDR_STATE_DEAD &&
ip6_del_rt(ifp->rt))
dst_free(&ifp->rt->u.dst); dst_free(&ifp->rt->u.dst);
break; break;
} }