2005-04-16 22:20:36 +00:00
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/* iptables match extension to limit the number of packets per second
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* seperately for each hashbucket (sourceip/sourceport/dstip/dstport)
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*
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* (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
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*
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* $Id: ipt_hashlimit.c 3244 2004-10-20 16:24:29Z laforge@netfilter.org $
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*
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* Development of this code was funded by Astaro AG, http://www.astaro.com/
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*/
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/random.h>
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#include <linux/jhash.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/list.h>
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2006-11-29 01:35:36 +00:00
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#include <linux/skbuff.h>
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2006-12-04 04:15:30 +00:00
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#include <linux/mm.h>
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2006-11-29 01:35:36 +00:00
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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2005-04-16 22:20:36 +00:00
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2006-11-29 01:35:36 +00:00
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#include <linux/netfilter/x_tables.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/netfilter_ipv4/ip_tables.h>
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2006-11-29 01:35:36 +00:00
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter/xt_hashlimit.h>
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2006-03-26 09:37:14 +00:00
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#include <linux/mutex.h>
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2005-04-16 22:20:36 +00:00
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("iptables match for limiting per hash-bucket");
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2006-11-29 01:35:36 +00:00
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MODULE_ALIAS("ipt_hashlimit");
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MODULE_ALIAS("ip6t_hashlimit");
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2005-04-16 22:20:36 +00:00
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/* need to declare this at the top */
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2006-11-29 01:35:36 +00:00
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static struct proc_dir_entry *hashlimit_procdir4;
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static struct proc_dir_entry *hashlimit_procdir6;
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2005-04-16 22:20:36 +00:00
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static struct file_operations dl_file_ops;
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/* hash table crap */
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struct dsthash_dst {
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2006-11-29 01:35:36 +00:00
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union {
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struct {
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__be32 src;
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__be32 dst;
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} ip;
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struct {
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__be32 src[4];
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__be32 dst[4];
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} ip6;
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} addr;
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2006-09-28 21:22:24 +00:00
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__be16 src_port;
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__be16 dst_port;
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2005-04-16 22:20:36 +00:00
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};
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struct dsthash_ent {
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/* static / read-only parts in the beginning */
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struct hlist_node node;
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struct dsthash_dst dst;
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/* modified structure members in the end */
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unsigned long expires; /* precalculated expiry time */
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struct {
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unsigned long prev; /* last modification */
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u_int32_t credit;
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u_int32_t credit_cap, cost;
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} rateinfo;
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};
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2006-11-29 01:35:36 +00:00
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struct xt_hashlimit_htable {
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2005-04-16 22:20:36 +00:00
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struct hlist_node node; /* global list of all htables */
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atomic_t use;
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2006-11-29 01:35:36 +00:00
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int family;
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2005-04-16 22:20:36 +00:00
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struct hashlimit_cfg cfg; /* config */
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/* used internally */
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spinlock_t lock; /* lock for list_head */
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u_int32_t rnd; /* random seed for hash */
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2006-06-09 19:18:47 +00:00
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int rnd_initialized;
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2006-11-29 01:35:36 +00:00
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unsigned int count; /* number entries in table */
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2005-04-16 22:20:36 +00:00
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struct timer_list timer; /* timer for gc */
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/* seq_file stuff */
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struct proc_dir_entry *pde;
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struct hlist_head hash[0]; /* hashtable itself */
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};
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2005-06-21 21:01:30 +00:00
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static DEFINE_SPINLOCK(hashlimit_lock); /* protects htables list */
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2006-03-26 09:37:14 +00:00
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static DEFINE_MUTEX(hlimit_mutex); /* additional checkentry protection */
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2005-04-16 22:20:36 +00:00
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static HLIST_HEAD(hashlimit_htables);
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2006-12-07 04:33:20 +00:00
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static struct kmem_cache *hashlimit_cachep __read_mostly;
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2005-04-16 22:20:36 +00:00
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static inline int dst_cmp(const struct dsthash_ent *ent, struct dsthash_dst *b)
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{
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2006-11-29 01:35:36 +00:00
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return !memcmp(&ent->dst, b, sizeof(ent->dst));
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2005-04-16 22:20:36 +00:00
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}
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2006-11-29 01:35:36 +00:00
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static u_int32_t
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hash_dst(const struct xt_hashlimit_htable *ht, const struct dsthash_dst *dst)
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2005-04-16 22:20:36 +00:00
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{
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2006-11-29 01:35:36 +00:00
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return jhash(dst, sizeof(*dst), ht->rnd) % ht->cfg.size;
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2005-04-16 22:20:36 +00:00
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}
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2006-11-29 01:35:36 +00:00
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static struct dsthash_ent *
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dsthash_find(const struct xt_hashlimit_htable *ht, struct dsthash_dst *dst)
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2005-04-16 22:20:36 +00:00
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{
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struct dsthash_ent *ent;
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struct hlist_node *pos;
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u_int32_t hash = hash_dst(ht, dst);
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2006-11-29 01:35:36 +00:00
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if (!hlist_empty(&ht->hash[hash])) {
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hlist_for_each_entry(ent, pos, &ht->hash[hash], node)
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if (dst_cmp(ent, dst))
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2005-04-16 22:20:36 +00:00
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return ent;
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2006-11-29 01:35:36 +00:00
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}
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2005-04-16 22:20:36 +00:00
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return NULL;
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}
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/* allocate dsthash_ent, initialize dst, put in htable and lock it */
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static struct dsthash_ent *
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2006-11-29 01:35:36 +00:00
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dsthash_alloc_init(struct xt_hashlimit_htable *ht, struct dsthash_dst *dst)
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2005-04-16 22:20:36 +00:00
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{
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struct dsthash_ent *ent;
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/* initialize hash with random val at the time we allocate
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* the first hashtable entry */
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2006-06-09 19:18:47 +00:00
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if (!ht->rnd_initialized) {
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2005-04-16 22:20:36 +00:00
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get_random_bytes(&ht->rnd, 4);
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2006-06-09 19:18:47 +00:00
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ht->rnd_initialized = 1;
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}
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2005-04-16 22:20:36 +00:00
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2006-11-29 01:35:36 +00:00
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if (ht->cfg.max && ht->count >= ht->cfg.max) {
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2005-04-16 22:20:36 +00:00
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/* FIXME: do something. question is what.. */
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if (net_ratelimit())
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2006-11-29 01:35:36 +00:00
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printk(KERN_WARNING
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"xt_hashlimit: max count of %u reached\n",
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2005-04-16 22:20:36 +00:00
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ht->cfg.max);
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return NULL;
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}
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ent = kmem_cache_alloc(hashlimit_cachep, GFP_ATOMIC);
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if (!ent) {
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if (net_ratelimit())
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2006-11-29 01:35:36 +00:00
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printk(KERN_ERR
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"xt_hashlimit: can't allocate dsthash_ent\n");
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2005-04-16 22:20:36 +00:00
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return NULL;
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}
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2006-11-29 01:35:36 +00:00
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memcpy(&ent->dst, dst, sizeof(ent->dst));
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2005-04-16 22:20:36 +00:00
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hlist_add_head(&ent->node, &ht->hash[hash_dst(ht, dst)]);
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2006-11-29 01:35:36 +00:00
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ht->count++;
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2005-04-16 22:20:36 +00:00
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return ent;
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}
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2006-11-29 01:35:36 +00:00
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static inline void
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dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent)
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2005-04-16 22:20:36 +00:00
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{
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hlist_del(&ent->node);
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kmem_cache_free(hashlimit_cachep, ent);
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2006-11-29 01:35:36 +00:00
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ht->count--;
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2005-04-16 22:20:36 +00:00
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}
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static void htable_gc(unsigned long htlong);
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2006-11-29 01:35:36 +00:00
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static int htable_create(struct xt_hashlimit_info *minfo, int family)
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2005-04-16 22:20:36 +00:00
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{
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2006-11-29 01:35:36 +00:00
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struct xt_hashlimit_htable *hinfo;
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2005-04-16 22:20:36 +00:00
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unsigned int size;
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2006-11-29 01:35:36 +00:00
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unsigned int i;
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2005-04-16 22:20:36 +00:00
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if (minfo->cfg.size)
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size = minfo->cfg.size;
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else {
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2006-11-29 01:35:36 +00:00
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size = ((num_physpages << PAGE_SHIFT) / 16384) /
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sizeof(struct list_head);
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2005-04-16 22:20:36 +00:00
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if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE))
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size = 8192;
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if (size < 16)
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size = 16;
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}
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/* FIXME: don't use vmalloc() here or anywhere else -HW */
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2006-11-29 01:35:36 +00:00
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hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) +
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sizeof(struct list_head) * size);
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2005-04-16 22:20:36 +00:00
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if (!hinfo) {
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2006-11-29 01:35:36 +00:00
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printk(KERN_ERR "xt_hashlimit: unable to create hashtable\n");
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2005-04-16 22:20:36 +00:00
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return -1;
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}
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minfo->hinfo = hinfo;
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/* copy match config into hashtable config */
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memcpy(&hinfo->cfg, &minfo->cfg, sizeof(hinfo->cfg));
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hinfo->cfg.size = size;
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if (!hinfo->cfg.max)
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hinfo->cfg.max = 8 * hinfo->cfg.size;
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else if (hinfo->cfg.max < hinfo->cfg.size)
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hinfo->cfg.max = hinfo->cfg.size;
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for (i = 0; i < hinfo->cfg.size; i++)
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INIT_HLIST_HEAD(&hinfo->hash[i]);
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atomic_set(&hinfo->use, 1);
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2006-11-29 01:35:36 +00:00
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hinfo->count = 0;
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hinfo->family = family;
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2006-06-09 19:18:47 +00:00
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hinfo->rnd_initialized = 0;
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2005-04-16 22:20:36 +00:00
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spin_lock_init(&hinfo->lock);
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2006-11-29 01:35:36 +00:00
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hinfo->pde = create_proc_entry(minfo->name, 0,
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family == AF_INET ? hashlimit_procdir4 :
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hashlimit_procdir6);
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2005-04-16 22:20:36 +00:00
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if (!hinfo->pde) {
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vfree(hinfo);
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return -1;
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}
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hinfo->pde->proc_fops = &dl_file_ops;
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hinfo->pde->data = hinfo;
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init_timer(&hinfo->timer);
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hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval);
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hinfo->timer.data = (unsigned long )hinfo;
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hinfo->timer.function = htable_gc;
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add_timer(&hinfo->timer);
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2005-06-21 21:01:30 +00:00
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spin_lock_bh(&hashlimit_lock);
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2005-04-16 22:20:36 +00:00
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hlist_add_head(&hinfo->node, &hashlimit_htables);
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2005-06-21 21:01:30 +00:00
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spin_unlock_bh(&hashlimit_lock);
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2005-04-16 22:20:36 +00:00
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return 0;
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}
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2006-11-29 01:35:36 +00:00
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static int select_all(struct xt_hashlimit_htable *ht, struct dsthash_ent *he)
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2005-04-16 22:20:36 +00:00
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{
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return 1;
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}
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2006-11-29 01:35:36 +00:00
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static int select_gc(struct xt_hashlimit_htable *ht, struct dsthash_ent *he)
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2005-04-16 22:20:36 +00:00
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{
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return (jiffies >= he->expires);
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}
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2006-11-29 01:35:36 +00:00
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static void htable_selective_cleanup(struct xt_hashlimit_htable *ht,
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int (*select)(struct xt_hashlimit_htable *ht,
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2005-04-16 22:20:36 +00:00
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struct dsthash_ent *he))
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{
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2006-11-29 01:35:36 +00:00
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unsigned int i;
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2005-04-16 22:20:36 +00:00
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/* lock hash table and iterate over it */
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spin_lock_bh(&ht->lock);
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for (i = 0; i < ht->cfg.size; i++) {
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struct dsthash_ent *dh;
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struct hlist_node *pos, *n;
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hlist_for_each_entry_safe(dh, pos, n, &ht->hash[i], node) {
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if ((*select)(ht, dh))
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2006-11-29 01:35:36 +00:00
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dsthash_free(ht, dh);
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2005-04-16 22:20:36 +00:00
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}
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}
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spin_unlock_bh(&ht->lock);
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}
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/* hash table garbage collector, run by timer */
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static void htable_gc(unsigned long htlong)
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{
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2006-11-29 01:35:36 +00:00
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struct xt_hashlimit_htable *ht = (struct xt_hashlimit_htable *)htlong;
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2005-04-16 22:20:36 +00:00
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htable_selective_cleanup(ht, select_gc);
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/* re-add the timer accordingly */
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ht->timer.expires = jiffies + msecs_to_jiffies(ht->cfg.gc_interval);
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add_timer(&ht->timer);
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}
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2006-11-29 01:35:36 +00:00
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static void htable_destroy(struct xt_hashlimit_htable *hinfo)
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2005-04-16 22:20:36 +00:00
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{
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/* remove timer, if it is pending */
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if (timer_pending(&hinfo->timer))
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del_timer(&hinfo->timer);
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/* remove proc entry */
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2006-11-29 01:35:36 +00:00
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remove_proc_entry(hinfo->pde->name,
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hinfo->family == AF_INET ? hashlimit_procdir4 :
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hashlimit_procdir6);
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2005-04-16 22:20:36 +00:00
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htable_selective_cleanup(hinfo, select_all);
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vfree(hinfo);
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}
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2006-11-29 01:35:36 +00:00
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static struct xt_hashlimit_htable *htable_find_get(char *name, int family)
|
2005-04-16 22:20:36 +00:00
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{
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2006-11-29 01:35:36 +00:00
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struct xt_hashlimit_htable *hinfo;
|
2005-04-16 22:20:36 +00:00
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struct hlist_node *pos;
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2005-06-21 21:01:30 +00:00
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spin_lock_bh(&hashlimit_lock);
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2005-04-16 22:20:36 +00:00
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|
|
hlist_for_each_entry(hinfo, pos, &hashlimit_htables, node) {
|
2006-11-29 01:35:36 +00:00
|
|
|
if (!strcmp(name, hinfo->pde->name) &&
|
|
|
|
hinfo->family == family) {
|
2005-04-16 22:20:36 +00:00
|
|
|
atomic_inc(&hinfo->use);
|
2005-06-21 21:01:30 +00:00
|
|
|
spin_unlock_bh(&hashlimit_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
return hinfo;
|
|
|
|
}
|
|
|
|
}
|
2005-06-21 21:01:30 +00:00
|
|
|
spin_unlock_bh(&hashlimit_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
static void htable_put(struct xt_hashlimit_htable *hinfo)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
if (atomic_dec_and_test(&hinfo->use)) {
|
2005-06-21 21:01:30 +00:00
|
|
|
spin_lock_bh(&hashlimit_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
hlist_del(&hinfo->node);
|
2005-06-21 21:01:30 +00:00
|
|
|
spin_unlock_bh(&hashlimit_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
htable_destroy(hinfo);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* The algorithm used is the Simple Token Bucket Filter (TBF)
|
|
|
|
* see net/sched/sch_tbf.c in the linux source tree
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Rusty: This is my (non-mathematically-inclined) understanding of
|
|
|
|
this algorithm. The `average rate' in jiffies becomes your initial
|
|
|
|
amount of credit `credit' and the most credit you can ever have
|
|
|
|
`credit_cap'. The `peak rate' becomes the cost of passing the
|
|
|
|
test, `cost'.
|
|
|
|
|
|
|
|
`prev' tracks the last packet hit: you gain one credit per jiffy.
|
|
|
|
If you get credit balance more than this, the extra credit is
|
|
|
|
discarded. Every time the match passes, you lose `cost' credits;
|
|
|
|
if you don't have that many, the test fails.
|
|
|
|
|
|
|
|
See Alexey's formal explanation in net/sched/sch_tbf.c.
|
|
|
|
|
|
|
|
To get the maximum range, we multiply by this factor (ie. you get N
|
|
|
|
credits per jiffy). We want to allow a rate as low as 1 per day
|
|
|
|
(slowest userspace tool allows), which means
|
|
|
|
CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32 ie.
|
|
|
|
*/
|
|
|
|
#define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24))
|
|
|
|
|
|
|
|
/* Repeated shift and or gives us all 1s, final shift and add 1 gives
|
|
|
|
* us the power of 2 below the theoretical max, so GCC simply does a
|
|
|
|
* shift. */
|
|
|
|
#define _POW2_BELOW2(x) ((x)|((x)>>1))
|
|
|
|
#define _POW2_BELOW4(x) (_POW2_BELOW2(x)|_POW2_BELOW2((x)>>2))
|
|
|
|
#define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4))
|
|
|
|
#define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8))
|
|
|
|
#define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16))
|
|
|
|
#define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1)
|
|
|
|
|
|
|
|
#define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
|
|
|
|
|
|
|
|
/* Precision saver. */
|
|
|
|
static inline u_int32_t
|
|
|
|
user2credits(u_int32_t user)
|
|
|
|
{
|
|
|
|
/* If multiplying would overflow... */
|
|
|
|
if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
|
|
|
|
/* Divide first. */
|
2006-11-29 01:35:36 +00:00
|
|
|
return (user / XT_HASHLIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now)
|
|
|
|
{
|
2006-11-29 01:35:36 +00:00
|
|
|
dh->rateinfo.credit += (now - dh->rateinfo.prev) * CREDITS_PER_JIFFY;
|
2005-04-16 22:20:36 +00:00
|
|
|
if (dh->rateinfo.credit > dh->rateinfo.credit_cap)
|
|
|
|
dh->rateinfo.credit = dh->rateinfo.credit_cap;
|
2006-11-29 01:35:36 +00:00
|
|
|
dh->rateinfo.prev = now;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
hashlimit_init_dst(struct xt_hashlimit_htable *hinfo, struct dsthash_dst *dst,
|
|
|
|
const struct sk_buff *skb, unsigned int protoff)
|
|
|
|
{
|
|
|
|
__be16 _ports[2], *ports;
|
|
|
|
int nexthdr;
|
|
|
|
|
|
|
|
memset(dst, 0, sizeof(*dst));
|
|
|
|
|
|
|
|
switch (hinfo->family) {
|
|
|
|
case AF_INET:
|
|
|
|
if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP)
|
|
|
|
dst->addr.ip.dst = skb->nh.iph->daddr;
|
|
|
|
if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP)
|
|
|
|
dst->addr.ip.src = skb->nh.iph->saddr;
|
|
|
|
|
|
|
|
if (!(hinfo->cfg.mode &
|
|
|
|
(XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT)))
|
|
|
|
return 0;
|
|
|
|
nexthdr = skb->nh.iph->protocol;
|
|
|
|
break;
|
2006-12-03 06:19:01 +00:00
|
|
|
#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
|
2006-11-29 01:35:36 +00:00
|
|
|
case AF_INET6:
|
|
|
|
if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP)
|
|
|
|
memcpy(&dst->addr.ip6.dst, &skb->nh.ipv6h->daddr,
|
|
|
|
sizeof(dst->addr.ip6.dst));
|
|
|
|
if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP)
|
|
|
|
memcpy(&dst->addr.ip6.src, &skb->nh.ipv6h->saddr,
|
|
|
|
sizeof(dst->addr.ip6.src));
|
|
|
|
|
|
|
|
if (!(hinfo->cfg.mode &
|
|
|
|
(XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT)))
|
|
|
|
return 0;
|
|
|
|
nexthdr = ipv6_find_hdr(skb, &protoff, -1, NULL);
|
|
|
|
if (nexthdr < 0)
|
|
|
|
return -1;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
BUG();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (nexthdr) {
|
|
|
|
case IPPROTO_TCP:
|
|
|
|
case IPPROTO_UDP:
|
2007-02-07 23:07:43 +00:00
|
|
|
case IPPROTO_UDPLITE:
|
2006-11-29 01:35:36 +00:00
|
|
|
case IPPROTO_SCTP:
|
|
|
|
case IPPROTO_DCCP:
|
|
|
|
ports = skb_header_pointer(skb, protoff, sizeof(_ports),
|
|
|
|
&_ports);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
_ports[0] = _ports[1] = 0;
|
|
|
|
ports = _ports;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (!ports)
|
|
|
|
return -1;
|
|
|
|
if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SPT)
|
|
|
|
dst->src_port = ports[0];
|
|
|
|
if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DPT)
|
|
|
|
dst->dst_port = ports[1];
|
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
hashlimit_match(const struct sk_buff *skb,
|
|
|
|
const struct net_device *in,
|
|
|
|
const struct net_device *out,
|
2006-03-21 02:02:56 +00:00
|
|
|
const struct xt_match *match,
|
2005-04-16 22:20:36 +00:00
|
|
|
const void *matchinfo,
|
|
|
|
int offset,
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
unsigned int protoff,
|
2005-04-16 22:20:36 +00:00
|
|
|
int *hotdrop)
|
|
|
|
{
|
2006-11-29 01:35:36 +00:00
|
|
|
struct xt_hashlimit_info *r =
|
|
|
|
((struct xt_hashlimit_info *)matchinfo)->u.master;
|
|
|
|
struct xt_hashlimit_htable *hinfo = r->hinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long now = jiffies;
|
|
|
|
struct dsthash_ent *dh;
|
|
|
|
struct dsthash_dst dst;
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
if (hashlimit_init_dst(hinfo, &dst, skb, protoff) < 0)
|
|
|
|
goto hotdrop;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
spin_lock_bh(&hinfo->lock);
|
2006-11-29 01:35:36 +00:00
|
|
|
dh = dsthash_find(hinfo, &dst);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!dh) {
|
2006-11-29 01:35:36 +00:00
|
|
|
dh = dsthash_alloc_init(hinfo, &dst);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!dh) {
|
|
|
|
spin_unlock_bh(&hinfo->lock);
|
2006-11-29 01:35:36 +00:00
|
|
|
goto hotdrop;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire);
|
|
|
|
dh->rateinfo.prev = jiffies;
|
2006-11-29 01:35:36 +00:00
|
|
|
dh->rateinfo.credit = user2credits(hinfo->cfg.avg *
|
|
|
|
hinfo->cfg.burst);
|
|
|
|
dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg *
|
|
|
|
hinfo->cfg.burst);
|
2005-04-16 22:20:36 +00:00
|
|
|
dh->rateinfo.cost = user2credits(hinfo->cfg.avg);
|
2006-08-14 01:06:02 +00:00
|
|
|
} else {
|
|
|
|
/* update expiration timeout */
|
|
|
|
dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire);
|
|
|
|
rateinfo_recalc(dh, now);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (dh->rateinfo.credit >= dh->rateinfo.cost) {
|
|
|
|
/* We're underlimit. */
|
|
|
|
dh->rateinfo.credit -= dh->rateinfo.cost;
|
|
|
|
spin_unlock_bh(&hinfo->lock);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_unlock_bh(&hinfo->lock);
|
|
|
|
|
|
|
|
/* default case: we're overlimit, thus don't match */
|
|
|
|
return 0;
|
2006-11-29 01:35:36 +00:00
|
|
|
|
|
|
|
hotdrop:
|
|
|
|
*hotdrop = 1;
|
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
hashlimit_checkentry(const char *tablename,
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
const void *inf,
|
2006-03-21 02:02:56 +00:00
|
|
|
const struct xt_match *match,
|
2005-04-16 22:20:36 +00:00
|
|
|
void *matchinfo,
|
|
|
|
unsigned int hook_mask)
|
|
|
|
{
|
2006-11-29 01:35:36 +00:00
|
|
|
struct xt_hashlimit_info *r = matchinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* Check for overflow. */
|
2006-11-29 01:35:36 +00:00
|
|
|
if (r->cfg.burst == 0 ||
|
|
|
|
user2credits(r->cfg.avg * r->cfg.burst) < user2credits(r->cfg.avg)) {
|
|
|
|
printk(KERN_ERR "xt_hashlimit: overflow, try lower: %u/%u\n",
|
2005-04-16 22:20:36 +00:00
|
|
|
r->cfg.avg, r->cfg.burst);
|
|
|
|
return 0;
|
|
|
|
}
|
2006-11-29 01:35:36 +00:00
|
|
|
if (r->cfg.mode == 0 ||
|
|
|
|
r->cfg.mode > (XT_HASHLIMIT_HASH_DPT |
|
|
|
|
XT_HASHLIMIT_HASH_DIP |
|
|
|
|
XT_HASHLIMIT_HASH_SIP |
|
|
|
|
XT_HASHLIMIT_HASH_SPT))
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
if (!r->cfg.gc_interval)
|
|
|
|
return 0;
|
|
|
|
if (!r->cfg.expire)
|
|
|
|
return 0;
|
2006-08-01 06:47:31 +00:00
|
|
|
if (r->name[sizeof(r->name) - 1] != '\0')
|
|
|
|
return 0;
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/* This is the best we've got: We cannot release and re-grab lock,
|
2006-11-29 01:35:36 +00:00
|
|
|
* since checkentry() is called before x_tables.c grabs xt_mutex.
|
|
|
|
* We also cannot grab the hashtable spinlock, since htable_create will
|
2005-04-16 22:20:36 +00:00
|
|
|
* call vmalloc, and that can sleep. And we cannot just re-search
|
|
|
|
* the list of htable's in htable_create(), since then we would
|
|
|
|
* create duplicate proc files. -HW */
|
2006-03-26 09:37:14 +00:00
|
|
|
mutex_lock(&hlimit_mutex);
|
2006-11-29 01:35:36 +00:00
|
|
|
r->hinfo = htable_find_get(r->name, match->family);
|
|
|
|
if (!r->hinfo && htable_create(r, match->family) != 0) {
|
2006-03-26 09:37:14 +00:00
|
|
|
mutex_unlock(&hlimit_mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2006-03-26 09:37:14 +00:00
|
|
|
mutex_unlock(&hlimit_mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* Ugly hack: For SMP, we only want to use one set */
|
|
|
|
r->u.master = r;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
2006-08-22 07:36:37 +00:00
|
|
|
hashlimit_destroy(const struct xt_match *match, void *matchinfo)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-11-29 01:35:36 +00:00
|
|
|
struct xt_hashlimit_info *r = matchinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
htable_put(r->hinfo);
|
|
|
|
}
|
|
|
|
|
2006-09-20 19:07:23 +00:00
|
|
|
#ifdef CONFIG_COMPAT
|
2006-11-29 01:35:36 +00:00
|
|
|
struct compat_xt_hashlimit_info {
|
2006-09-20 19:07:23 +00:00
|
|
|
char name[IFNAMSIZ];
|
|
|
|
struct hashlimit_cfg cfg;
|
|
|
|
compat_uptr_t hinfo;
|
|
|
|
compat_uptr_t master;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void compat_from_user(void *dst, void *src)
|
|
|
|
{
|
2006-11-29 01:35:36 +00:00
|
|
|
int off = offsetof(struct compat_xt_hashlimit_info, hinfo);
|
2006-09-20 19:07:23 +00:00
|
|
|
|
|
|
|
memcpy(dst, src, off);
|
2006-11-29 01:35:36 +00:00
|
|
|
memset(dst + off, 0, sizeof(struct compat_xt_hashlimit_info) - off);
|
2006-09-20 19:07:23 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int compat_to_user(void __user *dst, void *src)
|
|
|
|
{
|
2006-11-29 01:35:36 +00:00
|
|
|
int off = offsetof(struct compat_xt_hashlimit_info, hinfo);
|
2006-09-20 19:07:23 +00:00
|
|
|
|
|
|
|
return copy_to_user(dst, src, off) ? -EFAULT : 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
static struct xt_match xt_hashlimit[] = {
|
|
|
|
{
|
|
|
|
.name = "hashlimit",
|
|
|
|
.family = AF_INET,
|
|
|
|
.match = hashlimit_match,
|
|
|
|
.matchsize = sizeof(struct xt_hashlimit_info),
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
.compatsize = sizeof(struct compat_xt_hashlimit_info),
|
|
|
|
.compat_from_user = compat_from_user,
|
|
|
|
.compat_to_user = compat_to_user,
|
|
|
|
#endif
|
|
|
|
.checkentry = hashlimit_checkentry,
|
|
|
|
.destroy = hashlimit_destroy,
|
|
|
|
.me = THIS_MODULE
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.name = "hashlimit",
|
|
|
|
.family = AF_INET6,
|
|
|
|
.match = hashlimit_match,
|
|
|
|
.matchsize = sizeof(struct xt_hashlimit_info),
|
2006-09-20 19:07:23 +00:00
|
|
|
#ifdef CONFIG_COMPAT
|
2006-11-29 01:35:36 +00:00
|
|
|
.compatsize = sizeof(struct compat_xt_hashlimit_info),
|
|
|
|
.compat_from_user = compat_from_user,
|
|
|
|
.compat_to_user = compat_to_user,
|
2006-09-20 19:07:23 +00:00
|
|
|
#endif
|
2006-11-29 01:35:36 +00:00
|
|
|
.checkentry = hashlimit_checkentry,
|
|
|
|
.destroy = hashlimit_destroy,
|
|
|
|
.me = THIS_MODULE
|
|
|
|
},
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
/* PROC stuff */
|
|
|
|
static void *dl_seq_start(struct seq_file *s, loff_t *pos)
|
|
|
|
{
|
|
|
|
struct proc_dir_entry *pde = s->private;
|
2006-11-29 01:35:36 +00:00
|
|
|
struct xt_hashlimit_htable *htable = pde->data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned int *bucket;
|
|
|
|
|
|
|
|
spin_lock_bh(&htable->lock);
|
|
|
|
if (*pos >= htable->cfg.size)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
bucket = kmalloc(sizeof(unsigned int), GFP_ATOMIC);
|
|
|
|
if (!bucket)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
*bucket = *pos;
|
|
|
|
return bucket;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
|
|
{
|
|
|
|
struct proc_dir_entry *pde = s->private;
|
2006-11-29 01:35:36 +00:00
|
|
|
struct xt_hashlimit_htable *htable = pde->data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned int *bucket = (unsigned int *)v;
|
|
|
|
|
|
|
|
*pos = ++(*bucket);
|
|
|
|
if (*pos >= htable->cfg.size) {
|
|
|
|
kfree(v);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
return bucket;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void dl_seq_stop(struct seq_file *s, void *v)
|
|
|
|
{
|
|
|
|
struct proc_dir_entry *pde = s->private;
|
2006-11-29 01:35:36 +00:00
|
|
|
struct xt_hashlimit_htable *htable = pde->data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned int *bucket = (unsigned int *)v;
|
|
|
|
|
|
|
|
kfree(bucket);
|
|
|
|
spin_unlock_bh(&htable->lock);
|
|
|
|
}
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
static int dl_seq_real_show(struct dsthash_ent *ent, int family,
|
|
|
|
struct seq_file *s)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
/* recalculate to show accurate numbers */
|
|
|
|
rateinfo_recalc(ent, jiffies);
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
switch (family) {
|
|
|
|
case AF_INET:
|
|
|
|
return seq_printf(s, "%ld %u.%u.%u.%u:%u->"
|
|
|
|
"%u.%u.%u.%u:%u %u %u %u\n",
|
|
|
|
(long)(ent->expires - jiffies)/HZ,
|
|
|
|
NIPQUAD(ent->dst.addr.ip.src),
|
|
|
|
ntohs(ent->dst.src_port),
|
|
|
|
NIPQUAD(ent->dst.addr.ip.dst),
|
|
|
|
ntohs(ent->dst.dst_port),
|
|
|
|
ent->rateinfo.credit, ent->rateinfo.credit_cap,
|
|
|
|
ent->rateinfo.cost);
|
|
|
|
case AF_INET6:
|
|
|
|
return seq_printf(s, "%ld " NIP6_FMT ":%u->"
|
|
|
|
NIP6_FMT ":%u %u %u %u\n",
|
|
|
|
(long)(ent->expires - jiffies)/HZ,
|
|
|
|
NIP6(*(struct in6_addr *)&ent->dst.addr.ip6.src),
|
|
|
|
ntohs(ent->dst.src_port),
|
|
|
|
NIP6(*(struct in6_addr *)&ent->dst.addr.ip6.dst),
|
|
|
|
ntohs(ent->dst.dst_port),
|
|
|
|
ent->rateinfo.credit, ent->rateinfo.credit_cap,
|
|
|
|
ent->rateinfo.cost);
|
|
|
|
default:
|
|
|
|
BUG();
|
|
|
|
return 0;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int dl_seq_show(struct seq_file *s, void *v)
|
|
|
|
{
|
|
|
|
struct proc_dir_entry *pde = s->private;
|
2006-11-29 01:35:36 +00:00
|
|
|
struct xt_hashlimit_htable *htable = pde->data;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned int *bucket = (unsigned int *)v;
|
|
|
|
struct dsthash_ent *ent;
|
|
|
|
struct hlist_node *pos;
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
if (!hlist_empty(&htable->hash[*bucket])) {
|
|
|
|
hlist_for_each_entry(ent, pos, &htable->hash[*bucket], node)
|
|
|
|
if (dl_seq_real_show(ent, htable->family, s))
|
2005-04-16 22:20:36 +00:00
|
|
|
return 1;
|
2006-11-29 01:35:36 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct seq_operations dl_seq_ops = {
|
|
|
|
.start = dl_seq_start,
|
|
|
|
.next = dl_seq_next,
|
|
|
|
.stop = dl_seq_stop,
|
|
|
|
.show = dl_seq_show
|
|
|
|
};
|
|
|
|
|
|
|
|
static int dl_proc_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
int ret = seq_open(file, &dl_seq_ops);
|
|
|
|
|
|
|
|
if (!ret) {
|
|
|
|
struct seq_file *sf = file->private_data;
|
|
|
|
sf->private = PDE(inode);
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct file_operations dl_file_ops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.open = dl_proc_open,
|
|
|
|
.read = seq_read,
|
|
|
|
.llseek = seq_lseek,
|
|
|
|
.release = seq_release
|
|
|
|
};
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
static int __init xt_hashlimit_init(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-11-29 01:35:36 +00:00
|
|
|
int err;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
err = xt_register_matches(xt_hashlimit, ARRAY_SIZE(xt_hashlimit));
|
|
|
|
if (err < 0)
|
|
|
|
goto err1;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
err = -ENOMEM;
|
|
|
|
hashlimit_cachep = kmem_cache_create("xt_hashlimit",
|
|
|
|
sizeof(struct dsthash_ent), 0, 0,
|
|
|
|
NULL, NULL);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!hashlimit_cachep) {
|
2006-11-29 01:35:36 +00:00
|
|
|
printk(KERN_ERR "xt_hashlimit: unable to create slab cache\n");
|
|
|
|
goto err2;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2006-11-29 01:35:36 +00:00
|
|
|
hashlimit_procdir4 = proc_mkdir("ipt_hashlimit", proc_net);
|
|
|
|
if (!hashlimit_procdir4) {
|
|
|
|
printk(KERN_ERR "xt_hashlimit: unable to create proc dir "
|
|
|
|
"entry\n");
|
|
|
|
goto err3;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2006-11-29 01:35:36 +00:00
|
|
|
hashlimit_procdir6 = proc_mkdir("ip6t_hashlimit", proc_net);
|
|
|
|
if (!hashlimit_procdir6) {
|
2007-01-02 08:42:00 +00:00
|
|
|
printk(KERN_ERR "xt_hashlimit: unable to create proc dir "
|
2006-11-29 01:35:36 +00:00
|
|
|
"entry\n");
|
|
|
|
goto err4;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
err4:
|
2005-04-16 22:20:36 +00:00
|
|
|
remove_proc_entry("ipt_hashlimit", proc_net);
|
2006-11-29 01:35:36 +00:00
|
|
|
err3:
|
2005-04-16 22:20:36 +00:00
|
|
|
kmem_cache_destroy(hashlimit_cachep);
|
2006-11-29 01:35:36 +00:00
|
|
|
err2:
|
|
|
|
xt_unregister_matches(xt_hashlimit, ARRAY_SIZE(xt_hashlimit));
|
|
|
|
err1:
|
|
|
|
return err;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
}
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
static void __exit xt_hashlimit_fini(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-11-29 01:35:36 +00:00
|
|
|
remove_proc_entry("ipt_hashlimit", proc_net);
|
|
|
|
remove_proc_entry("ip6t_hashlimit", proc_net);
|
|
|
|
kmem_cache_destroy(hashlimit_cachep);
|
|
|
|
xt_unregister_matches(xt_hashlimit, ARRAY_SIZE(xt_hashlimit));
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2006-11-29 01:35:36 +00:00
|
|
|
module_init(xt_hashlimit_init);
|
|
|
|
module_exit(xt_hashlimit_fini);
|