--- /dev/null
+/*
+ * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/rbtree.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+
+static DEFINE_SPINLOCK(nft_rbtree_lock);
+
+struct nft_rbtree {
+ struct rb_root root;
+};
+
+struct nft_rbtree_elem {
+ struct rb_node node;
+ struct nft_set_ext ext;
+};
+
+
+static bool nft_rbtree_lookup(const struct nft_set *set, const u32 *key,
+ const struct nft_set_ext **ext)
+{
+ const struct nft_rbtree *priv = nft_set_priv(set);
+ const struct nft_rbtree_elem *rbe, *interval = NULL;
+ const struct rb_node *parent;
+ u8 genmask = nft_genmask_cur(read_pnet(&set->pnet));
+ int d;
+
+ spin_lock_bh(&nft_rbtree_lock);
+ parent = priv->root.rb_node;
+ while (parent != NULL) {
+ rbe = rb_entry(parent, struct nft_rbtree_elem, node);
+
+ d = memcmp(nft_set_ext_key(&rbe->ext), key, set->klen);
+ if (d < 0) {
+ parent = parent->rb_left;
+ interval = rbe;
+ } else if (d > 0)
+ parent = parent->rb_right;
+ else {
+found:
+ if (!nft_set_elem_active(&rbe->ext, genmask)) {
+ parent = parent->rb_left;
+ continue;
+ }
+ if (nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) &&
+ *nft_set_ext_flags(&rbe->ext) &
+ NFT_SET_ELEM_INTERVAL_END)
+ goto out;
+ spin_unlock_bh(&nft_rbtree_lock);
+
+ *ext = &rbe->ext;
+ return true;
+ }
+ }
+
+ if (set->flags & NFT_SET_INTERVAL && interval != NULL) {
+ rbe = interval;
+ goto found;
+ }
+out:
+ spin_unlock_bh(&nft_rbtree_lock);
+ return false;
+}
+
+static int __nft_rbtree_insert(const struct nft_set *set,
+ struct nft_rbtree_elem *new)
+{
+ struct nft_rbtree *priv = nft_set_priv(set);
+ struct nft_rbtree_elem *rbe;
+ struct rb_node *parent, **p;
+ u8 genmask = nft_genmask_next(read_pnet(&set->pnet));
+ int d;
+
+ parent = NULL;
+ p = &priv->root.rb_node;
+ while (*p != NULL) {
+ parent = *p;
+ rbe = rb_entry(parent, struct nft_rbtree_elem, node);
+ d = memcmp(nft_set_ext_key(&rbe->ext),
+ nft_set_ext_key(&new->ext),
+ set->klen);
+ if (d < 0)
+ p = &parent->rb_left;
+ else if (d > 0)
+ p = &parent->rb_right;
+ else {
+ if (nft_set_elem_active(&rbe->ext, genmask))
+ return -EEXIST;
+ p = &parent->rb_left;
+ }
+ }
+ rb_link_node(&new->node, parent, p);
+ rb_insert_color(&new->node, &priv->root);
+ return 0;
+}
+
+static int nft_rbtree_insert(const struct nft_set *set,
+ const struct nft_set_elem *elem)
+{
+ struct nft_rbtree_elem *rbe = elem->priv;
+ int err;
+
+ spin_lock_bh(&nft_rbtree_lock);
+ err = __nft_rbtree_insert(set, rbe);
+ spin_unlock_bh(&nft_rbtree_lock);
+
+ return err;
+}
+
+static void nft_rbtree_remove(const struct nft_set *set,
+ const struct nft_set_elem *elem)
+{
+ struct nft_rbtree *priv = nft_set_priv(set);
+ struct nft_rbtree_elem *rbe = elem->priv;
+
+ spin_lock_bh(&nft_rbtree_lock);
+ rb_erase(&rbe->node, &priv->root);
+ spin_unlock_bh(&nft_rbtree_lock);
+}
+
+static void nft_rbtree_activate(const struct nft_set *set,
+ const struct nft_set_elem *elem)
+{
+ struct nft_rbtree_elem *rbe = elem->priv;
+
+ nft_set_elem_change_active(set, &rbe->ext);
+}
+
+static void *nft_rbtree_deactivate(const struct nft_set *set,
+ const struct nft_set_elem *elem)
+{
+ const struct nft_rbtree *priv = nft_set_priv(set);
+ const struct rb_node *parent = priv->root.rb_node;
+ struct nft_rbtree_elem *rbe;
+ u8 genmask = nft_genmask_cur(read_pnet(&set->pnet));
+ int d;
+
+ while (parent != NULL) {
+ rbe = rb_entry(parent, struct nft_rbtree_elem, node);
+
+ d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key.val,
+ set->klen);
+ if (d < 0)
+ parent = parent->rb_left;
+ else if (d > 0)
+ parent = parent->rb_right;
+ else {
+ if (!nft_set_elem_active(&rbe->ext, genmask)) {
+ parent = parent->rb_left;
+ continue;
+ }
+ nft_set_elem_change_active(set, &rbe->ext);
+ return rbe;
+ }
+ }
+ return NULL;
+}
+
+static void nft_rbtree_walk(const struct nft_ctx *ctx,
+ const struct nft_set *set,
+ struct nft_set_iter *iter)
+{
+ const struct nft_rbtree *priv = nft_set_priv(set);
+ struct nft_rbtree_elem *rbe;
+ struct nft_set_elem elem;
+ struct rb_node *node;
+ u8 genmask = nft_genmask_cur(read_pnet(&set->pnet));
+
+ spin_lock_bh(&nft_rbtree_lock);
+ for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) {
+ rbe = rb_entry(node, struct nft_rbtree_elem, node);
+
+ if (iter->count < iter->skip)
+ goto cont;
+ if (!nft_set_elem_active(&rbe->ext, genmask))
+ goto cont;
+
+ elem.priv = rbe;
+
+ iter->err = iter->fn(ctx, set, iter, &elem);
+ if (iter->err < 0) {
+ spin_unlock_bh(&nft_rbtree_lock);
+ return;
+ }
+cont:
+ iter->count++;
+ }
+ spin_unlock_bh(&nft_rbtree_lock);
+}
+
+static unsigned int nft_rbtree_privsize(const struct nlattr * const nla[])
+{
+ return sizeof(struct nft_rbtree);
+}
+
+static int nft_rbtree_init(const struct nft_set *set,
+ const struct nft_set_desc *desc,
+ const struct nlattr * const nla[])
+{
+ struct nft_rbtree *priv = nft_set_priv(set);
+
+ priv->root = RB_ROOT;
+ return 0;
+}
+
+static void nft_rbtree_destroy(const struct nft_set *set)
+{
+ struct nft_rbtree *priv = nft_set_priv(set);
+ struct nft_rbtree_elem *rbe;
+ struct rb_node *node;
+
+ while ((node = priv->root.rb_node) != NULL) {
+ rb_erase(node, &priv->root);
+ rbe = rb_entry(node, struct nft_rbtree_elem, node);
+ nft_set_elem_destroy(set, rbe);
+ }
+}
+
+static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features,
+ struct nft_set_estimate *est)
+{
+ unsigned int nsize;
+
+ nsize = sizeof(struct nft_rbtree_elem);
+ if (desc->size)
+ est->size = sizeof(struct nft_rbtree) + desc->size * nsize;
+ else
+ est->size = nsize;
+
+ est->class = NFT_SET_CLASS_O_LOG_N;
+
+ return true;
+}
+
+static struct nft_set_ops nft_rbtree_ops __read_mostly = {
+ .privsize = nft_rbtree_privsize,
+ .elemsize = offsetof(struct nft_rbtree_elem, ext),
+ .estimate = nft_rbtree_estimate,
+ .init = nft_rbtree_init,
+ .destroy = nft_rbtree_destroy,
+ .insert = nft_rbtree_insert,
+ .remove = nft_rbtree_remove,
+ .deactivate = nft_rbtree_deactivate,
+ .activate = nft_rbtree_activate,
+ .lookup = nft_rbtree_lookup,
+ .walk = nft_rbtree_walk,
+ .features = NFT_SET_INTERVAL | NFT_SET_MAP,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_rbtree_module_init(void)
+{
+ return nft_register_set(&nft_rbtree_ops);
+}
+
+static void __exit nft_rbtree_module_exit(void)
+{
+ nft_unregister_set(&nft_rbtree_ops);
+}
+
+module_init(nft_rbtree_module_init);
+module_exit(nft_rbtree_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_ALIAS_NFT_SET();
Code Review / kvmfornfv.git / blobdiff