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author | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-08-09 17:11:46 +0300 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-08-12 01:44:37 +0300 |
commit | 0ed6389c483dc77cdbdd48de0ca7ce41723dd667 (patch) | |
tree | 359c77fe53ce37ca8c5fe569da44d93079c6e767 /net/netfilter/nft_set_rbtree.c | |
parent | a6c46d9bc9d8ca6e30e681aadd30b73c44434b7d (diff) | |
download | linux-0ed6389c483dc77cdbdd48de0ca7ce41723dd667.tar.xz |
netfilter: nf_tables: rename set implementations
Use nft_set_* prefix for backend set implementations, thus we can use
nft_hash for the new hash expression.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_set_rbtree.c')
-rw-r--r-- | net/netfilter/nft_set_rbtree.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c new file mode 100644 index 000000000000..6473936d05c6 --- /dev/null +++ b/net/netfilter/nft_set_rbtree.c @@ -0,0 +1,314 @@ +/* + * 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_interval_end(const struct nft_rbtree_elem *rbe) +{ + return nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) && + (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END); +} + +static bool nft_rbtree_equal(const struct nft_set *set, const void *this, + const struct nft_rbtree_elem *interval) +{ + return memcmp(this, nft_set_ext_key(&interval->ext), set->klen) == 0; +} + +static bool nft_rbtree_lookup(const struct net *net, 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; + u8 genmask = nft_genmask_cur(net); + const struct rb_node *parent; + const void *this; + 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); + + this = nft_set_ext_key(&rbe->ext); + d = memcmp(this, key, set->klen); + if (d < 0) { + parent = parent->rb_left; + /* In case of adjacent ranges, we always see the high + * part of the range in first place, before the low one. + * So don't update interval if the keys are equal. + */ + if (interval && nft_rbtree_equal(set, this, interval)) + continue; + 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_rbtree_interval_end(rbe)) + 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 net *net, const struct nft_set *set, + struct nft_rbtree_elem *new) +{ + struct nft_rbtree *priv = nft_set_priv(set); + u8 genmask = nft_genmask_next(net); + 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 = 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)) { + if (nft_rbtree_interval_end(rbe) && + !nft_rbtree_interval_end(new)) + p = &parent->rb_left; + else if (!nft_rbtree_interval_end(rbe) && + nft_rbtree_interval_end(new)) + 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 net *net, 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(net, 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 net *net, + const struct nft_set *set, + const struct nft_set_elem *elem) +{ + struct nft_rbtree_elem *rbe = elem->priv; + + nft_set_elem_change_active(net, set, &rbe->ext); +} + +static void *nft_rbtree_deactivate(const struct net *net, + 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, *this = elem->priv; + u8 genmask = nft_genmask_next(net); + 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; + } + if (nft_rbtree_interval_end(rbe) && + !nft_rbtree_interval_end(this)) { + parent = parent->rb_left; + continue; + } else if (!nft_rbtree_interval_end(rbe) && + nft_rbtree_interval_end(this)) { + parent = parent->rb_right; + continue; + } + nft_set_elem_change_active(net, 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; + + 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, iter->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(); |