diff options
Diffstat (limited to 'net/netfilter/nft_rbtree.c')
| -rw-r--r-- | net/netfilter/nft_rbtree.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/net/netfilter/nft_rbtree.c b/net/netfilter/nft_rbtree.c new file mode 100644 index 000000000000..ca0c1b231bfe --- /dev/null +++ b/net/netfilter/nft_rbtree.c @@ -0,0 +1,247 @@ +/* + * 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> + +struct nft_rbtree { + struct rb_root root; +}; + +struct nft_rbtree_elem { + struct rb_node node; + u16 flags; + struct nft_data key; + struct nft_data data[]; +}; + +static bool nft_rbtree_lookup(const struct nft_set *set, + const struct nft_data *key, + struct nft_data *data) +{ + const struct nft_rbtree *priv = nft_set_priv(set); + const struct nft_rbtree_elem *rbe, *interval = NULL; + const struct rb_node *parent = priv->root.rb_node; + int d; + + while (parent != NULL) { + rbe = rb_entry(parent, struct nft_rbtree_elem, node); + + d = nft_data_cmp(&rbe->key, key, set->klen); + if (d < 0) { + parent = parent->rb_left; + interval = rbe; + } else if (d > 0) + parent = parent->rb_right; + else { +found: + if (rbe->flags & NFT_SET_ELEM_INTERVAL_END) + goto out; + if (set->flags & NFT_SET_MAP) + nft_data_copy(data, rbe->data); + return true; + } + } + + if (set->flags & NFT_SET_INTERVAL && interval != NULL) { + rbe = interval; + goto found; + } +out: + return false; +} + +static void nft_rbtree_elem_destroy(const struct nft_set *set, + struct nft_rbtree_elem *rbe) +{ + nft_data_uninit(&rbe->key, NFT_DATA_VALUE); + if (set->flags & NFT_SET_MAP) + nft_data_uninit(rbe->data, set->dtype); + kfree(rbe); +} + +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; + int d; + + parent = NULL; + p = &priv->root.rb_node; + while (*p != NULL) { + parent = *p; + rbe = rb_entry(parent, struct nft_rbtree_elem, node); + d = nft_data_cmp(&rbe->key, &new->key, set->klen); + if (d < 0) + p = &parent->rb_left; + else if (d > 0) + p = &parent->rb_right; + else + return -EEXIST; + } + 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; + unsigned int size; + int err; + + size = sizeof(*rbe); + if (set->flags & NFT_SET_MAP) + size += sizeof(rbe->data[0]); + + rbe = kzalloc(size, GFP_KERNEL); + if (rbe == NULL) + return -ENOMEM; + + rbe->flags = elem->flags; + nft_data_copy(&rbe->key, &elem->key); + if (set->flags & NFT_SET_MAP) + nft_data_copy(rbe->data, &elem->data); + + err = __nft_rbtree_insert(set, rbe); + if (err < 0) + kfree(rbe); + 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->cookie; + + rb_erase(&rbe->node, &priv->root); + kfree(rbe); +} + +static int nft_rbtree_get(const struct nft_set *set, 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; + int d; + + while (parent != NULL) { + rbe = rb_entry(parent, struct nft_rbtree_elem, node); + + d = nft_data_cmp(&rbe->key, &elem->key, set->klen); + if (d < 0) + parent = parent->rb_left; + else if (d > 0) + parent = parent->rb_right; + else { + elem->cookie = rbe; + if (set->flags & NFT_SET_MAP) + nft_data_copy(&elem->data, rbe->data); + elem->flags = rbe->flags; + return 0; + } + } + return -ENOENT; +} + +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); + const struct nft_rbtree_elem *rbe; + struct nft_set_elem elem; + struct rb_node *node; + + for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) { + if (iter->count < iter->skip) + goto cont; + + rbe = rb_entry(node, struct nft_rbtree_elem, node); + nft_data_copy(&elem.key, &rbe->key); + if (set->flags & NFT_SET_MAP) + nft_data_copy(&elem.data, rbe->data); + elem.flags = rbe->flags; + + iter->err = iter->fn(ctx, set, iter, &elem); + if (iter->err < 0) + return; +cont: + iter->count++; + } +} + +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 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_rbtree_elem_destroy(set, rbe); + } +} + +static struct nft_set_ops nft_rbtree_ops __read_mostly = { + .privsize = nft_rbtree_privsize, + .init = nft_rbtree_init, + .destroy = nft_rbtree_destroy, + .insert = nft_rbtree_insert, + .remove = nft_rbtree_remove, + .get = nft_rbtree_get, + .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(); |