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neigh: remove dynamic neigh table registration support
Currently there are only three neigh tables in the whole kernel: arp table, ndisc table and decnet neigh table. What's more, we don't support registering multiple tables per family. Therefore we can just make these tables statically built-in. Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong
David S. Miller
parent
b2e2f0c779
commit
d7480fd3b1
5 changed files with 133 additions and 149 deletions
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@ -220,6 +220,13 @@ struct neigh_table {
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struct pneigh_entry **phash_buckets;
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};
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enum {
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NEIGH_ARP_TABLE = 0,
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NEIGH_ND_TABLE = 1,
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NEIGH_DN_TABLE = 2,
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NEIGH_NR_TABLES,
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};
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static inline int neigh_parms_family(struct neigh_parms *p)
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{
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return p->tbl->family;
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@ -240,8 +247,8 @@ static inline void *neighbour_priv(const struct neighbour *n)
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#define NEIGH_UPDATE_F_ISROUTER 0x40000000
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#define NEIGH_UPDATE_F_ADMIN 0x80000000
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void neigh_table_init(struct neigh_table *tbl);
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int neigh_table_clear(struct neigh_table *tbl);
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void neigh_table_init(int index, struct neigh_table *tbl);
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int neigh_table_clear(int index, struct neigh_table *tbl);
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struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey,
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struct net_device *dev);
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struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net,
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@ -56,7 +56,6 @@ static void __neigh_notify(struct neighbour *n, int type, int flags);
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static void neigh_update_notify(struct neighbour *neigh);
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static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
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static struct neigh_table *neigh_tables;
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#ifdef CONFIG_PROC_FS
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static const struct file_operations neigh_stat_seq_fops;
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#endif
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@ -87,13 +86,8 @@ static const struct file_operations neigh_stat_seq_fops;
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the most complicated procedure, which we allow is dev->hard_header.
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It is supposed, that dev->hard_header is simplistic and does
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not make callbacks to neighbour tables.
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The last lock is neigh_tbl_lock. It is pure SMP lock, protecting
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list of neighbour tables. This list is used only in process context,
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*/
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static DEFINE_RWLOCK(neigh_tbl_lock);
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static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb)
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{
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kfree_skb(skb);
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@ -1520,7 +1514,9 @@ static void neigh_parms_destroy(struct neigh_parms *parms)
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static struct lock_class_key neigh_table_proxy_queue_class;
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static void neigh_table_init_no_netlink(struct neigh_table *tbl)
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static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly;
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void neigh_table_init(int index, struct neigh_table *tbl)
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{
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unsigned long now = jiffies;
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unsigned long phsize;
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@ -1566,34 +1562,14 @@ static void neigh_table_init_no_netlink(struct neigh_table *tbl)
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tbl->last_flush = now;
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tbl->last_rand = now + tbl->parms.reachable_time * 20;
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}
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void neigh_table_init(struct neigh_table *tbl)
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{
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struct neigh_table *tmp;
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neigh_table_init_no_netlink(tbl);
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write_lock(&neigh_tbl_lock);
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for (tmp = neigh_tables; tmp; tmp = tmp->next) {
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if (tmp->family == tbl->family)
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break;
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}
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tbl->next = neigh_tables;
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neigh_tables = tbl;
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write_unlock(&neigh_tbl_lock);
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if (unlikely(tmp)) {
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pr_err("Registering multiple tables for family %d\n",
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tbl->family);
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dump_stack();
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}
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neigh_tables[index] = tbl;
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}
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EXPORT_SYMBOL(neigh_table_init);
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int neigh_table_clear(struct neigh_table *tbl)
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int neigh_table_clear(int index, struct neigh_table *tbl)
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{
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struct neigh_table **tp;
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neigh_tables[index] = NULL;
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/* It is not clean... Fix it to unload IPv6 module safely */
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cancel_delayed_work_sync(&tbl->gc_work);
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del_timer_sync(&tbl->proxy_timer);
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@ -1601,14 +1577,6 @@ int neigh_table_clear(struct neigh_table *tbl)
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neigh_ifdown(tbl, NULL);
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if (atomic_read(&tbl->entries))
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pr_crit("neighbour leakage\n");
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write_lock(&neigh_tbl_lock);
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for (tp = &neigh_tables; *tp; tp = &(*tp)->next) {
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if (*tp == tbl) {
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*tp = tbl->next;
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break;
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}
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}
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write_unlock(&neigh_tbl_lock);
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call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu,
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neigh_hash_free_rcu);
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@ -1626,12 +1594,32 @@ int neigh_table_clear(struct neigh_table *tbl)
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}
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EXPORT_SYMBOL(neigh_table_clear);
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static struct neigh_table *neigh_find_table(int family)
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{
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struct neigh_table *tbl = NULL;
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switch (family) {
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case AF_INET:
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tbl = neigh_tables[NEIGH_ARP_TABLE];
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break;
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case AF_INET6:
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tbl = neigh_tables[NEIGH_ND_TABLE];
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break;
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case AF_DECnet:
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tbl = neigh_tables[NEIGH_DN_TABLE];
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break;
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}
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return tbl;
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}
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static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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struct net *net = sock_net(skb->sk);
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struct ndmsg *ndm;
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struct nlattr *dst_attr;
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struct neigh_table *tbl;
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struct neighbour *neigh;
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struct net_device *dev = NULL;
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int err = -EINVAL;
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@ -1652,39 +1640,31 @@ static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh)
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}
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}
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read_lock(&neigh_tbl_lock);
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for (tbl = neigh_tables; tbl; tbl = tbl->next) {
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struct neighbour *neigh;
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tbl = neigh_find_table(ndm->ndm_family);
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if (tbl == NULL)
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return -EAFNOSUPPORT;
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if (tbl->family != ndm->ndm_family)
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continue;
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read_unlock(&neigh_tbl_lock);
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if (nla_len(dst_attr) < tbl->key_len)
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goto out;
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if (nla_len(dst_attr) < tbl->key_len)
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goto out;
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if (ndm->ndm_flags & NTF_PROXY) {
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err = pneigh_delete(tbl, net, nla_data(dst_attr), dev);
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goto out;
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}
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if (dev == NULL)
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goto out;
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neigh = neigh_lookup(tbl, nla_data(dst_attr), dev);
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if (neigh == NULL) {
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err = -ENOENT;
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goto out;
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}
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err = neigh_update(neigh, NULL, NUD_FAILED,
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NEIGH_UPDATE_F_OVERRIDE |
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NEIGH_UPDATE_F_ADMIN);
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neigh_release(neigh);
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if (ndm->ndm_flags & NTF_PROXY) {
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err = pneigh_delete(tbl, net, nla_data(dst_attr), dev);
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goto out;
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}
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read_unlock(&neigh_tbl_lock);
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err = -EAFNOSUPPORT;
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if (dev == NULL)
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goto out;
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neigh = neigh_lookup(tbl, nla_data(dst_attr), dev);
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if (neigh == NULL) {
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err = -ENOENT;
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goto out;
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}
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err = neigh_update(neigh, NULL, NUD_FAILED,
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NEIGH_UPDATE_F_OVERRIDE |
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NEIGH_UPDATE_F_ADMIN);
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neigh_release(neigh);
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out:
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return err;
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@ -1692,11 +1672,14 @@ static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh)
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static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE;
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struct net *net = sock_net(skb->sk);
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struct ndmsg *ndm;
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struct nlattr *tb[NDA_MAX+1];
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struct neigh_table *tbl;
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struct net_device *dev = NULL;
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struct neighbour *neigh;
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void *dst, *lladdr;
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int err;
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ASSERT_RTNL();
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@ -1720,70 +1703,60 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh)
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goto out;
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}
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read_lock(&neigh_tbl_lock);
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for (tbl = neigh_tables; tbl; tbl = tbl->next) {
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int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE;
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struct neighbour *neigh;
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void *dst, *lladdr;
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tbl = neigh_find_table(ndm->ndm_family);
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if (tbl == NULL)
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return -EAFNOSUPPORT;
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if (tbl->family != ndm->ndm_family)
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continue;
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read_unlock(&neigh_tbl_lock);
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if (nla_len(tb[NDA_DST]) < tbl->key_len)
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goto out;
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dst = nla_data(tb[NDA_DST]);
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lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL;
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if (nla_len(tb[NDA_DST]) < tbl->key_len)
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goto out;
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dst = nla_data(tb[NDA_DST]);
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lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL;
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if (ndm->ndm_flags & NTF_PROXY) {
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struct pneigh_entry *pn;
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if (ndm->ndm_flags & NTF_PROXY) {
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struct pneigh_entry *pn;
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err = -ENOBUFS;
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pn = pneigh_lookup(tbl, net, dst, dev, 1);
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if (pn) {
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pn->flags = ndm->ndm_flags;
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err = 0;
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}
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goto out;
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}
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if (dev == NULL)
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goto out;
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neigh = neigh_lookup(tbl, dst, dev);
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if (neigh == NULL) {
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if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
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err = -ENOENT;
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goto out;
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}
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neigh = __neigh_lookup_errno(tbl, dst, dev);
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if (IS_ERR(neigh)) {
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err = PTR_ERR(neigh);
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goto out;
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}
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} else {
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if (nlh->nlmsg_flags & NLM_F_EXCL) {
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err = -EEXIST;
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neigh_release(neigh);
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goto out;
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}
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if (!(nlh->nlmsg_flags & NLM_F_REPLACE))
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flags &= ~NEIGH_UPDATE_F_OVERRIDE;
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}
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if (ndm->ndm_flags & NTF_USE) {
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neigh_event_send(neigh, NULL);
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err = -ENOBUFS;
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pn = pneigh_lookup(tbl, net, dst, dev, 1);
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if (pn) {
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pn->flags = ndm->ndm_flags;
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err = 0;
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} else
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err = neigh_update(neigh, lladdr, ndm->ndm_state, flags);
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neigh_release(neigh);
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}
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goto out;
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}
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read_unlock(&neigh_tbl_lock);
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err = -EAFNOSUPPORT;
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if (dev == NULL)
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goto out;
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neigh = neigh_lookup(tbl, dst, dev);
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if (neigh == NULL) {
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if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
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err = -ENOENT;
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goto out;
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}
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neigh = __neigh_lookup_errno(tbl, dst, dev);
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if (IS_ERR(neigh)) {
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err = PTR_ERR(neigh);
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goto out;
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}
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} else {
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if (nlh->nlmsg_flags & NLM_F_EXCL) {
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err = -EEXIST;
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neigh_release(neigh);
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goto out;
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}
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if (!(nlh->nlmsg_flags & NLM_F_REPLACE))
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flags &= ~NEIGH_UPDATE_F_OVERRIDE;
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}
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if (ndm->ndm_flags & NTF_USE) {
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neigh_event_send(neigh, NULL);
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err = 0;
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} else
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err = neigh_update(neigh, lladdr, ndm->ndm_state, flags);
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neigh_release(neigh);
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out:
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return err;
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}
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@ -1982,7 +1955,8 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh)
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struct neigh_table *tbl;
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struct ndtmsg *ndtmsg;
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struct nlattr *tb[NDTA_MAX+1];
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int err;
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bool found = false;
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int err, tidx;
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err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX,
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nl_neightbl_policy);
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@ -1995,19 +1969,21 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh)
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}
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ndtmsg = nlmsg_data(nlh);
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read_lock(&neigh_tbl_lock);
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for (tbl = neigh_tables; tbl; tbl = tbl->next) {
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for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) {
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tbl = neigh_tables[tidx];
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if (!tbl)
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continue;
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if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family)
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continue;
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if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0)
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if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) {
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found = true;
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break;
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}
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}
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if (tbl == NULL) {
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err = -ENOENT;
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goto errout_locked;
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}
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if (!found)
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return -ENOENT;
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/*
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* We acquire tbl->lock to be nice to the periodic timers and
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@ -2118,8 +2094,6 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh)
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errout_tbl_lock:
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write_unlock_bh(&tbl->lock);
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errout_locked:
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read_unlock(&neigh_tbl_lock);
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errout:
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return err;
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}
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@ -2134,10 +2108,13 @@ static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
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family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family;
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read_lock(&neigh_tbl_lock);
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for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) {
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for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) {
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struct neigh_parms *p;
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tbl = neigh_tables[tidx];
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if (!tbl)
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continue;
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if (tidx < tbl_skip || (family && tbl->family != family))
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continue;
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@ -2168,7 +2145,6 @@ static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
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neigh_skip = 0;
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}
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out:
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read_unlock(&neigh_tbl_lock);
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cb->args[0] = tidx;
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cb->args[1] = nidx;
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@ -2351,7 +2327,6 @@ static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
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int proxy = 0;
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int err;
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read_lock(&neigh_tbl_lock);
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family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family;
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/* check for full ndmsg structure presence, family member is
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|
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@ -2363,8 +2338,11 @@ static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
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s_t = cb->args[0];
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for (tbl = neigh_tables, t = 0; tbl;
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tbl = tbl->next, t++) {
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for (t = 0; t < NEIGH_NR_TABLES; t++) {
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tbl = neigh_tables[t];
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if (!tbl)
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continue;
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if (t < s_t || (family && tbl->family != family))
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continue;
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if (t > s_t)
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@ -2377,7 +2355,6 @@ static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
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if (err < 0)
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break;
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}
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read_unlock(&neigh_tbl_lock);
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cb->args[0] = t;
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return skb->len;
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|
|
|
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|
|
@ -591,7 +591,7 @@ static const struct file_operations dn_neigh_seq_fops = {
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|
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void __init dn_neigh_init(void)
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{
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neigh_table_init(&dn_neigh_table);
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neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table);
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proc_create("decnet_neigh", S_IRUGO, init_net.proc_net,
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&dn_neigh_seq_fops);
|
||||
}
|
||||
|
|
@ -599,5 +599,5 @@ void __init dn_neigh_init(void)
|
|||
void __exit dn_neigh_cleanup(void)
|
||||
{
|
||||
remove_proc_entry("decnet_neigh", init_net.proc_net);
|
||||
neigh_table_clear(&dn_neigh_table);
|
||||
neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1292,7 +1292,7 @@ static int arp_proc_init(void);
|
|||
|
||||
void __init arp_init(void)
|
||||
{
|
||||
neigh_table_init(&arp_tbl);
|
||||
neigh_table_init(NEIGH_ARP_TABLE, &arp_tbl);
|
||||
|
||||
dev_add_pack(&arp_packet_type);
|
||||
arp_proc_init();
|
||||
|
|
|
|||
|
|
@ -1763,7 +1763,7 @@ int __init ndisc_init(void)
|
|||
/*
|
||||
* Initialize the neighbour table
|
||||
*/
|
||||
neigh_table_init(&nd_tbl);
|
||||
neigh_table_init(NEIGH_ND_TABLE, &nd_tbl);
|
||||
|
||||
#ifdef CONFIG_SYSCTL
|
||||
err = neigh_sysctl_register(NULL, &nd_tbl.parms,
|
||||
|
|
@ -1796,6 +1796,6 @@ void ndisc_cleanup(void)
|
|||
#ifdef CONFIG_SYSCTL
|
||||
neigh_sysctl_unregister(&nd_tbl.parms);
|
||||
#endif
|
||||
neigh_table_clear(&nd_tbl);
|
||||
neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl);
|
||||
unregister_pernet_subsys(&ndisc_net_ops);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue