mirror of https://gitee.com/openkylin/linux.git
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>
This commit is contained in:
stephen hemminger
David S. Miller
parent
372e6c8f1f
commit
c2e21293c0
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@ -54,7 +54,7 @@ struct inet6_ifaddr {
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struct inet6_dev *idev;
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struct rt6_info *rt;
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struct inet6_ifaddr *lst_next; /* next addr in addr_lst */
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struct hlist_node addr_lst;
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struct inet6_ifaddr *if_next; /* next addr in inet6_dev */
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#ifdef CONFIG_IPV6_PRIVACY
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@ -126,7 +126,7 @@ static int ipv6_count_addresses(struct inet6_dev *idev);
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/*
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* Configured unicast address hash table
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*/
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static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
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static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
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static DEFINE_RWLOCK(addrconf_hash_lock);
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static void addrconf_verify(unsigned long);
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@ -528,7 +528,7 @@ static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
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void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
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{
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WARN_ON(ifp->if_next != NULL);
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WARN_ON(ifp->lst_next != NULL);
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WARN_ON(!hlist_unhashed(&ifp->addr_lst));
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#ifdef NET_REFCNT_DEBUG
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printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
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@ -643,6 +643,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
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spin_lock_init(&ifa->lock);
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init_timer(&ifa->timer);
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INIT_HLIST_NODE(&ifa->addr_lst);
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ifa->timer.data = (unsigned long) ifa;
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ifa->scope = scope;
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ifa->prefix_len = pfxlen;
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@ -669,8 +670,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
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/* Add to big hash table */
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hash = ipv6_addr_hash(addr);
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ifa->lst_next = inet6_addr_lst[hash];
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inet6_addr_lst[hash] = ifa;
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hlist_add_head(&ifa->addr_lst, &inet6_addr_lst[hash]);
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in6_ifa_hold(ifa);
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write_unlock(&addrconf_hash_lock);
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@ -718,15 +718,8 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
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ifp->dead = 1;
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write_lock_bh(&addrconf_hash_lock);
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for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
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ifap = &ifa->lst_next) {
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if (ifa == ifp) {
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*ifap = ifa->lst_next;
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__in6_ifa_put(ifp);
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ifa->lst_next = NULL;
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break;
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}
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}
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hlist_del_init(&ifp->addr_lst);
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__in6_ifa_put(ifp);
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write_unlock_bh(&addrconf_hash_lock);
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write_lock_bh(&idev->lock);
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@ -1277,11 +1270,12 @@ static int ipv6_count_addresses(struct inet6_dev *idev)
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int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
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struct net_device *dev, int strict)
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{
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struct inet6_ifaddr * ifp;
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struct inet6_ifaddr *ifp = NULL;
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struct hlist_node *node;
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u8 hash = ipv6_addr_hash(addr);
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read_lock_bh(&addrconf_hash_lock);
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for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
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hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
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if (!net_eq(dev_net(ifp->idev->dev), net))
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continue;
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if (ipv6_addr_equal(&ifp->addr, addr) &&
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@ -1300,10 +1294,11 @@ static
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int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
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struct net_device *dev)
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{
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struct inet6_ifaddr * ifp;
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struct inet6_ifaddr *ifp;
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struct hlist_node *node;
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u8 hash = ipv6_addr_hash(addr);
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for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
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hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
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if (!net_eq(dev_net(ifp->idev->dev), net))
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continue;
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if (ipv6_addr_equal(&ifp->addr, addr)) {
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@ -1342,11 +1337,12 @@ EXPORT_SYMBOL(ipv6_chk_prefix);
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struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
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struct net_device *dev, int strict)
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{
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struct inet6_ifaddr * ifp;
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struct inet6_ifaddr *ifp = NULL;
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struct hlist_node *node;
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u8 hash = ipv6_addr_hash(addr);
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read_lock_bh(&addrconf_hash_lock);
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for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
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hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
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if (!net_eq(dev_net(ifp->idev->dev), net))
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continue;
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if (ipv6_addr_equal(&ifp->addr, addr)) {
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@ -2612,7 +2608,6 @@ static int addrconf_ifdown(struct net_device *dev, int how)
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struct inet6_dev *idev;
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struct inet6_ifaddr *ifa, *keep_list, **bifa;
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struct net *net = dev_net(dev);
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int i;
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ASSERT_RTNL();
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@ -2637,25 +2632,6 @@ static int addrconf_ifdown(struct net_device *dev, int how)
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}
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/* Step 2: clear hash table */
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for (i=0; i<IN6_ADDR_HSIZE; i++) {
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bifa = &inet6_addr_lst[i];
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write_lock_bh(&addrconf_hash_lock);
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while ((ifa = *bifa) != NULL) {
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if (ifa->idev == idev &&
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(how || !(ifa->flags&IFA_F_PERMANENT) ||
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ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
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*bifa = ifa->lst_next;
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ifa->lst_next = NULL;
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__in6_ifa_put(ifa);
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continue;
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}
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bifa = &ifa->lst_next;
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}
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write_unlock_bh(&addrconf_hash_lock);
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}
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write_lock_bh(&idev->lock);
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/* Step 3: clear flags for stateless addrconf */
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@ -2721,6 +2697,12 @@ static int addrconf_ifdown(struct net_device *dev, int how)
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}
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write_unlock_bh(&idev->lock);
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/* clear hash table */
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write_lock_bh(&addrconf_hash_lock);
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hlist_del_init(&ifa->addr_lst);
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__in6_ifa_put(ifa);
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write_unlock_bh(&addrconf_hash_lock);
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__ipv6_ifa_notify(RTM_DELADDR, ifa);
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atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
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in6_ifa_put(ifa);
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@ -2963,36 +2945,37 @@ static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
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struct net *net = seq_file_net(seq);
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for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
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ifa = inet6_addr_lst[state->bucket];
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while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
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ifa = ifa->lst_next;
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if (ifa)
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break;
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struct hlist_node *n;
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hlist_for_each_entry(ifa, n,
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&inet6_addr_lst[state->bucket], addr_lst) {
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if (net_eq(dev_net(ifa->idev->dev), net))
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return ifa;
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}
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}
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return ifa;
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return NULL;
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}
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static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
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static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
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struct inet6_ifaddr *ifa)
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{
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struct if6_iter_state *state = seq->private;
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struct net *net = seq_file_net(seq);
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struct hlist_node *n = &ifa->addr_lst;
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ifa = ifa->lst_next;
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try_again:
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if (ifa) {
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if (!net_eq(dev_net(ifa->idev->dev), net)) {
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ifa = ifa->lst_next;
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goto try_again;
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hlist_for_each_entry_continue(ifa, n, addr_lst) {
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if (net_eq(dev_net(ifa->idev->dev), net))
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return ifa;
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}
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while (++state->bucket < IN6_ADDR_HSIZE) {
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hlist_for_each_entry(ifa, n,
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&inet6_addr_lst[state->bucket], addr_lst) {
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if (net_eq(dev_net(ifa->idev->dev), net))
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return ifa;
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}
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}
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if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
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ifa = inet6_addr_lst[state->bucket];
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goto try_again;
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}
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return ifa;
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return NULL;
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}
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static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
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@ -3094,10 +3077,12 @@ void if6_proc_exit(void)
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int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
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{
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int ret = 0;
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struct inet6_ifaddr * ifp;
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struct inet6_ifaddr *ifp = NULL;
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struct hlist_node *n;
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u8 hash = ipv6_addr_hash(addr);
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read_lock_bh(&addrconf_hash_lock);
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for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
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hlist_for_each_entry(ifp, n, &inet6_addr_lst[hash], addr_lst) {
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if (!net_eq(dev_net(ifp->idev->dev), net))
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continue;
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if (ipv6_addr_equal(&ifp->addr, addr) &&
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@ -3118,6 +3103,7 @@ int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
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static void addrconf_verify(unsigned long foo)
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{
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struct inet6_ifaddr *ifp;
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struct hlist_node *node;
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unsigned long now, next;
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int i;
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@ -3131,7 +3117,7 @@ static void addrconf_verify(unsigned long foo)
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restart:
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read_lock(&addrconf_hash_lock);
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for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
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hlist_for_each_entry(ifp, node, &inet6_addr_lst[i], addr_lst) {
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unsigned long age;
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#ifdef CONFIG_IPV6_PRIVACY
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unsigned long regen_advance;
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@ -4550,7 +4536,7 @@ EXPORT_SYMBOL(unregister_inet6addr_notifier);
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int __init addrconf_init(void)
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{
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int err;
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int i, err;
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if ((err = ipv6_addr_label_init()) < 0) {
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printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
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@ -4585,6 +4571,9 @@ int __init addrconf_init(void)
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if (err)
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goto errlo;
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for (i = 0; i < IN6_ADDR_HSIZE; i++)
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INIT_HLIST_HEAD(&inet6_addr_lst[i]);
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register_netdevice_notifier(&ipv6_dev_notf);
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addrconf_verify(0);
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@ -4613,7 +4602,6 @@ int __init addrconf_init(void)
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void addrconf_cleanup(void)
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{
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struct inet6_ifaddr *ifa;
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struct net_device *dev;
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int i;
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@ -4634,18 +4622,8 @@ void addrconf_cleanup(void)
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* Check hash table.
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*/
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write_lock_bh(&addrconf_hash_lock);
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for (i=0; i < IN6_ADDR_HSIZE; i++) {
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for (ifa=inet6_addr_lst[i]; ifa; ) {
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struct inet6_ifaddr *bifa;
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bifa = ifa;
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ifa = ifa->lst_next;
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printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
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/* Do not free it; something is wrong.
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Now we can investigate it with debugger.
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*/
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}
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}
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for (i = 0; i < IN6_ADDR_HSIZE; i++)
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WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
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write_unlock_bh(&addrconf_hash_lock);
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del_timer(&addr_chk_timer);
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