/* * 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; 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; spin_lock_bh(&nft_rbtree_lock); 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); spin_unlock_bh(&nft_rbtree_lock); return true; } } if (set->flags & NFT_SET_INTERVAL && interval != NULL) { rbe = interval; goto found; } out: spin_unlock_bh(&nft_rbtree_lock); 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 && !(rbe->flags & NFT_SET_ELEM_INTERVAL_END)) 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 && !(elem->flags & NFT_SET_ELEM_INTERVAL_END)) 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 && !(rbe->flags & NFT_SET_ELEM_INTERVAL_END)) nft_data_copy(rbe->data, &elem->data); spin_lock_bh(&nft_rbtree_lock); err = __nft_rbtree_insert(set, rbe); if (err < 0) kfree(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->cookie; spin_lock_bh(&nft_rbtree_lock); rb_erase(&rbe->node, &priv->root); spin_unlock_bh(&nft_rbtree_lock); 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; spin_lock_bh(&nft_rbtree_lock); 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 && !(rbe->flags & NFT_SET_ELEM_INTERVAL_END)) nft_data_copy(&elem->data, rbe->data); elem->flags = rbe->flags; spin_unlock_bh(&nft_rbtree_lock); return 0; } } spin_unlock_bh(&nft_rbtree_lock); 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; spin_lock_bh(&nft_rbtree_lock); 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 && !(rbe->flags & NFT_SET_ELEM_INTERVAL_END)) nft_data_copy(&elem.data, rbe->data); elem.flags = rbe->flags; 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_rbtree_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 (features & NFT_SET_MAP) nsize += FIELD_SIZEOF(struct nft_rbtree_elem, data[0]); 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, .estimate = nft_rbtree_estimate, .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();