ipv6: convert addrconf list to hlist

Using hash list macros, simplifies code and helps later RCU.

This patch includes some initialization that is not strictly necessary,
since an empty hlist node/list is all zero; and list is in BSS
and node is allocated with kzalloc.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index 09d9064..4984015 100644 (file)
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -54,7 +54,7 @@ struct inet6_ifaddr {
        struct inet6_dev        *idev;
        struct rt6_info         *rt;
 
-       struct inet6_ifaddr     *lst_next;      /* next addr in addr_lst */
+       struct hlist_node       addr_lst;
        struct inet6_ifaddr     *if_next;       /* next addr in inet6_dev */
 
 #ifdef CONFIG_IPV6_PRIVACY

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f372f89..0488b9f 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -126,7 +126,7 @@ static int ipv6_count_addresses(struct inet6_dev *idev);
 /*
  *     Configured unicast address hash table
  */
-static struct inet6_ifaddr             *inet6_addr_lst[IN6_ADDR_HSIZE];
+static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 static DEFINE_RWLOCK(addrconf_hash_lock);
 
 static void addrconf_verify(unsigned long);
@@ -528,7 +528,7 @@ static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 {
        WARN_ON(ifp->if_next != NULL);
-       WARN_ON(ifp->lst_next != NULL);
+       WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 
 #ifdef NET_REFCNT_DEBUG
        printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
@@ -643,6 +643,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 
        spin_lock_init(&ifa->lock);
        init_timer(&ifa->timer);
+       INIT_HLIST_NODE(&ifa->addr_lst);
        ifa->timer.data = (unsigned long) ifa;
        ifa->scope = scope;
        ifa->prefix_len = pfxlen;
@@ -669,8 +670,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
        /* Add to big hash table */
        hash = ipv6_addr_hash(addr);
 
-       ifa->lst_next = inet6_addr_lst[hash];
-       inet6_addr_lst[hash] = ifa;
+       hlist_add_head(&ifa->addr_lst, &inet6_addr_lst[hash]);
        in6_ifa_hold(ifa);
        write_unlock(&addrconf_hash_lock);
 
@@ -718,15 +718,8 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
        ifp->dead = 1;
 
        write_lock_bh(&addrconf_hash_lock);
-       for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
-            ifap = &ifa->lst_next) {
-               if (ifa == ifp) {
-                       *ifap = ifa->lst_next;
-                       __in6_ifa_put(ifp);
-                       ifa->lst_next = NULL;
-                       break;
-               }
-       }
+       hlist_del_init(&ifp->addr_lst);
+       __in6_ifa_put(ifp);
        write_unlock_bh(&addrconf_hash_lock);
 
        write_lock_bh(&idev->lock);
@@ -1277,11 +1270,12 @@ static int ipv6_count_addresses(struct inet6_dev *idev)
 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
                  struct net_device *dev, int strict)
 {
-       struct inet6_ifaddr * ifp;
+       struct inet6_ifaddr *ifp = NULL;
+       struct hlist_node *node;
        u8 hash = ipv6_addr_hash(addr);
 
        read_lock_bh(&addrconf_hash_lock);
-       for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
+       hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
                if (!net_eq(dev_net(ifp->idev->dev), net))
                        continue;
                if (ipv6_addr_equal(&ifp->addr, addr) &&
@@ -1300,10 +1294,11 @@ static
 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
                       struct net_device *dev)
 {
-       struct inet6_ifaddr * ifp;
+       struct inet6_ifaddr *ifp;
+       struct hlist_node *node;
        u8 hash = ipv6_addr_hash(addr);
 
-       for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
+       hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
                if (!net_eq(dev_net(ifp->idev->dev), net))
                        continue;
                if (ipv6_addr_equal(&ifp->addr, addr)) {
@@ -1342,11 +1337,12 @@ EXPORT_SYMBOL(ipv6_chk_prefix);
 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
                                     struct net_device *dev, int strict)
 {
-       struct inet6_ifaddr * ifp;
+       struct inet6_ifaddr *ifp = NULL;
+       struct hlist_node *node;
        u8 hash = ipv6_addr_hash(addr);
 
        read_lock_bh(&addrconf_hash_lock);
-       for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
+       hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
                if (!net_eq(dev_net(ifp->idev->dev), net))
                        continue;
                if (ipv6_addr_equal(&ifp->addr, addr)) {
@@ -2612,7 +2608,6 @@ static int addrconf_ifdown(struct net_device *dev, int how)
        struct inet6_dev *idev;
        struct inet6_ifaddr *ifa, *keep_list, **bifa;
        struct net *net = dev_net(dev);
-       int i;
 
        ASSERT_RTNL();
 
@@ -2637,25 +2632,6 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 
        }
 
-       /* Step 2: clear hash table */
-       for (i=0; i<IN6_ADDR_HSIZE; i++) {
-               bifa = &inet6_addr_lst[i];
-
-               write_lock_bh(&addrconf_hash_lock);
-               while ((ifa = *bifa) != NULL) {
-                       if (ifa->idev == idev &&
-                           (how || !(ifa->flags&IFA_F_PERMANENT) ||
-                            ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
-                               *bifa = ifa->lst_next;
-                               ifa->lst_next = NULL;
-                               __in6_ifa_put(ifa);
-                               continue;
-                       }
-                       bifa = &ifa->lst_next;
-               }
-               write_unlock_bh(&addrconf_hash_lock);
-       }
-
        write_lock_bh(&idev->lock);
 
        /* Step 3: clear flags for stateless addrconf */
@@ -2721,6 +2697,12 @@ static int addrconf_ifdown(struct net_device *dev, int how)
                }
                write_unlock_bh(&idev->lock);
 
+               /* clear hash table */
+               write_lock_bh(&addrconf_hash_lock);
+               hlist_del_init(&ifa->addr_lst);
+               __in6_ifa_put(ifa);
+               write_unlock_bh(&addrconf_hash_lock);
+
                __ipv6_ifa_notify(RTM_DELADDR, ifa);
                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
                in6_ifa_put(ifa);
@@ -2963,36 +2945,37 @@ static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
        struct net *net = seq_file_net(seq);
 
        for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
-               ifa = inet6_addr_lst[state->bucket];
-
-               while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
-                       ifa = ifa->lst_next;
-               if (ifa)
-                       break;
+               struct hlist_node *n;
+               hlist_for_each_entry(ifa, n,
+                                    &inet6_addr_lst[state->bucket], addr_lst) {
+                       if (net_eq(dev_net(ifa->idev->dev), net))
+                               return ifa;
+               }
        }
-       return ifa;
+       return NULL;
 }
 
-static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
+static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
+                                        struct inet6_ifaddr *ifa)
 {
        struct if6_iter_state *state = seq->private;
        struct net *net = seq_file_net(seq);
+       struct hlist_node *n = &ifa->addr_lst;
 
-       ifa = ifa->lst_next;
-try_again:
-       if (ifa) {
-               if (!net_eq(dev_net(ifa->idev->dev), net)) {
-                       ifa = ifa->lst_next;
-                       goto try_again;
-               }
+       hlist_for_each_entry_continue(ifa, n, addr_lst) {
+               if (net_eq(dev_net(ifa->idev->dev), net))
+                       return ifa;
        }
 
-       if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
-               ifa = inet6_addr_lst[state->bucket];
-               goto try_again;
+       while (++state->bucket < IN6_ADDR_HSIZE) {
+               hlist_for_each_entry(ifa, n,
+                                    &inet6_addr_lst[state->bucket], addr_lst) {
+                       if (net_eq(dev_net(ifa->idev->dev), net))
+                               return ifa;
+               }
        }
 
-       return ifa;
+       return NULL;
 }
 
 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
@@ -3094,10 +3077,12 @@ void if6_proc_exit(void)
 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
 {
        int ret = 0;
-       struct inet6_ifaddr * ifp;
+       struct inet6_ifaddr *ifp = NULL;
+       struct hlist_node *n;
        u8 hash = ipv6_addr_hash(addr);
+
        read_lock_bh(&addrconf_hash_lock);
-       for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
+       hlist_for_each_entry(ifp, n, &inet6_addr_lst[hash], addr_lst) {
                if (!net_eq(dev_net(ifp->idev->dev), net))
                        continue;
                if (ipv6_addr_equal(&ifp->addr, addr) &&
@@ -3118,6 +3103,7 @@ int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
 static void addrconf_verify(unsigned long foo)
 {
        struct inet6_ifaddr *ifp;
+       struct hlist_node *node;
        unsigned long now, next;
        int i;
 
@@ -3131,7 +3117,7 @@ static void addrconf_verify(unsigned long foo)
 
 restart:
                read_lock(&addrconf_hash_lock);
-               for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
+               hlist_for_each_entry(ifp, node, &inet6_addr_lst[i], addr_lst) {
                        unsigned long age;
 #ifdef CONFIG_IPV6_PRIVACY
                        unsigned long regen_advance;
@@ -4550,7 +4536,7 @@ EXPORT_SYMBOL(unregister_inet6addr_notifier);
 
 int __init addrconf_init(void)
 {
-       int err;
+       int i, err;
 
        if ((err = ipv6_addr_label_init()) < 0) {
                printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
@@ -4585,6 +4571,9 @@ int __init addrconf_init(void)
        if (err)
                goto errlo;
 
+       for (i = 0; i < IN6_ADDR_HSIZE; i++)
+               INIT_HLIST_HEAD(&inet6_addr_lst[i]);
+
        register_netdevice_notifier(&ipv6_dev_notf);
 
        addrconf_verify(0);
@@ -4613,7 +4602,6 @@ errlo:
 
 void addrconf_cleanup(void)
 {
-       struct inet6_ifaddr *ifa;
        struct net_device *dev;
        int i;
 
@@ -4634,18 +4622,8 @@ void addrconf_cleanup(void)
         *      Check hash table.
         */
        write_lock_bh(&addrconf_hash_lock);
-       for (i=0; i < IN6_ADDR_HSIZE; i++) {
-               for (ifa=inet6_addr_lst[i]; ifa; ) {
-                       struct inet6_ifaddr *bifa;
-
-                       bifa = ifa;
-                       ifa = ifa->lst_next;
-                       printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
-                       /* Do not free it; something is wrong.
-                          Now we can investigate it with debugger.
-                        */
-               }
-       }
+       for (i = 0; i < IN6_ADDR_HSIZE; i++)
+               WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
        write_unlock_bh(&addrconf_hash_lock);
 
        del_timer(&addr_chk_timer);