-/* iptables match extension to limit the number of packets per second
- * seperately for each hashbucket (sourceip/sourceport/dstip/dstport)
+/*
+ * xt_hashlimit - Netfilter module to limit the number of packets per time
+ * separately for each hashbucket (sourceip/sourceport/dstip/dstport)
*
- * (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
- *
- * $Id: ipt_hashlimit.c 3244 2004-10-20 16:24:29Z laforge@netfilter.org $
+ * (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
+ * Copyright © CC Computer Consultants GmbH, 2007 - 2008
*
* Development of this code was funded by Astaro AG, http://www.astaro.com/
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/random.h>
#include <linux/mm.h>
#include <linux/in.h>
#include <linux/ip.h>
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
#include <linux/ipv6.h>
#include <net/ipv6.h>
+#endif
+
#include <net/net_namespace.h>
+#include <net/netns/generic.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_DESCRIPTION("iptables match for limiting per hash-bucket");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
+MODULE_DESCRIPTION("Xtables: per hash-bucket rate-limit match");
MODULE_ALIAS("ipt_hashlimit");
MODULE_ALIAS("ip6t_hashlimit");
+struct hashlimit_net {
+ struct hlist_head htables;
+ struct proc_dir_entry *ipt_hashlimit;
+ struct proc_dir_entry *ip6t_hashlimit;
+};
+
+static int hashlimit_net_id;
+static inline struct hashlimit_net *hashlimit_pernet(struct net *net)
+{
+ return net_generic(net, hashlimit_net_id);
+}
+
/* need to declare this at the top */
-static struct proc_dir_entry *hashlimit_procdir4;
-static struct proc_dir_entry *hashlimit_procdir6;
static const struct file_operations dl_file_ops;
/* hash table crap */
__be32 src;
__be32 dst;
} ip;
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
struct {
__be32 src[4];
__be32 dst[4];
} ip6;
- } addr;
+#endif
+ };
__be16 src_port;
__be16 dst_port;
};
struct dsthash_dst dst;
/* modified structure members in the end */
+ spinlock_t lock;
unsigned long expires; /* precalculated expiry time */
struct {
unsigned long prev; /* last modification */
u_int32_t credit;
u_int32_t credit_cap, cost;
} rateinfo;
+ struct rcu_head rcu;
};
struct xt_hashlimit_htable {
struct hlist_node node; /* global list of all htables */
- atomic_t use;
- int family;
+ int use;
+ u_int8_t family;
+ bool rnd_initialized;
- struct hashlimit_cfg cfg; /* config */
+ struct hashlimit_cfg1 cfg; /* config */
/* used internally */
spinlock_t lock; /* lock for list_head */
u_int32_t rnd; /* random seed for hash */
- int rnd_initialized;
unsigned int count; /* number entries in table */
struct timer_list timer; /* timer for gc */
/* seq_file stuff */
struct proc_dir_entry *pde;
+ struct net *net;
struct hlist_head hash[0]; /* hashtable itself */
};
-static DEFINE_SPINLOCK(hashlimit_lock); /* protects htables list */
-static DEFINE_MUTEX(hlimit_mutex); /* additional checkentry protection */
-static HLIST_HEAD(hashlimit_htables);
+static DEFINE_MUTEX(hashlimit_mutex); /* protects htables list */
static struct kmem_cache *hashlimit_cachep __read_mostly;
static inline bool dst_cmp(const struct dsthash_ent *ent,
u_int32_t hash = hash_dst(ht, dst);
if (!hlist_empty(&ht->hash[hash])) {
- hlist_for_each_entry(ent, pos, &ht->hash[hash], node)
- if (dst_cmp(ent, dst))
+ hlist_for_each_entry_rcu(ent, pos, &ht->hash[hash], node)
+ if (dst_cmp(ent, dst)) {
+ spin_lock(&ent->lock);
return ent;
+ }
}
return NULL;
}
{
struct dsthash_ent *ent;
+ spin_lock(&ht->lock);
/* initialize hash with random val at the time we allocate
* the first hashtable entry */
- if (!ht->rnd_initialized) {
- get_random_bytes(&ht->rnd, 4);
- ht->rnd_initialized = 1;
+ if (unlikely(!ht->rnd_initialized)) {
+ get_random_bytes(&ht->rnd, sizeof(ht->rnd));
+ ht->rnd_initialized = true;
}
if (ht->cfg.max && ht->count >= ht->cfg.max) {
/* FIXME: do something. question is what.. */
if (net_ratelimit())
- printk(KERN_WARNING
- "xt_hashlimit: max count of %u reached\n",
- ht->cfg.max);
- return NULL;
- }
-
- ent = kmem_cache_alloc(hashlimit_cachep, GFP_ATOMIC);
+ pr_err("max count of %u reached\n", ht->cfg.max);
+ ent = NULL;
+ } else
+ ent = kmem_cache_alloc(hashlimit_cachep, GFP_ATOMIC);
if (!ent) {
if (net_ratelimit())
- printk(KERN_ERR
- "xt_hashlimit: can't allocate dsthash_ent\n");
- return NULL;
- }
- memcpy(&ent->dst, dst, sizeof(ent->dst));
+ pr_err("cannot allocate dsthash_ent\n");
+ } else {
+ memcpy(&ent->dst, dst, sizeof(ent->dst));
+ spin_lock_init(&ent->lock);
- hlist_add_head(&ent->node, &ht->hash[hash_dst(ht, dst)]);
- ht->count++;
+ spin_lock(&ent->lock);
+ hlist_add_head_rcu(&ent->node, &ht->hash[hash_dst(ht, dst)]);
+ ht->count++;
+ }
+ spin_unlock(&ht->lock);
return ent;
}
+static void dsthash_free_rcu(struct rcu_head *head)
+{
+ struct dsthash_ent *ent = container_of(head, struct dsthash_ent, rcu);
+
+ kmem_cache_free(hashlimit_cachep, ent);
+}
+
static inline void
dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent)
{
- hlist_del(&ent->node);
- kmem_cache_free(hashlimit_cachep, ent);
+ hlist_del_rcu(&ent->node);
+ call_rcu_bh(&ent->rcu, dsthash_free_rcu);
ht->count--;
}
static void htable_gc(unsigned long htlong);
-static int htable_create(struct xt_hashlimit_info *minfo, int family)
+static int htable_create(struct net *net, struct xt_hashlimit_mtinfo1 *minfo,
+ u_int8_t family)
{
+ struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
struct xt_hashlimit_htable *hinfo;
unsigned int size;
unsigned int i;
- if (minfo->cfg.size)
+ if (minfo->cfg.size) {
size = minfo->cfg.size;
- else {
- size = ((num_physpages << PAGE_SHIFT) / 16384) /
+ } else {
+ size = (totalram_pages << PAGE_SHIFT) / 16384 /
sizeof(struct list_head);
- if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE))
+ if (totalram_pages > 1024 * 1024 * 1024 / PAGE_SIZE)
size = 8192;
if (size < 16)
size = 16;
}
/* FIXME: don't use vmalloc() here or anywhere else -HW */
hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) +
- sizeof(struct list_head) * size);
- if (!hinfo) {
- printk(KERN_ERR "xt_hashlimit: unable to create hashtable\n");
- return -1;
- }
+ sizeof(struct list_head) * size);
+ if (hinfo == NULL)
+ return -ENOMEM;
minfo->hinfo = hinfo;
/* copy match config into hashtable config */
memcpy(&hinfo->cfg, &minfo->cfg, sizeof(hinfo->cfg));
hinfo->cfg.size = size;
- if (!hinfo->cfg.max)
+ if (hinfo->cfg.max == 0)
hinfo->cfg.max = 8 * hinfo->cfg.size;
else if (hinfo->cfg.max < hinfo->cfg.size)
hinfo->cfg.max = hinfo->cfg.size;
for (i = 0; i < hinfo->cfg.size; i++)
INIT_HLIST_HEAD(&hinfo->hash[i]);
- atomic_set(&hinfo->use, 1);
+ hinfo->use = 1;
hinfo->count = 0;
hinfo->family = family;
- hinfo->rnd_initialized = 0;
+ hinfo->rnd_initialized = false;
spin_lock_init(&hinfo->lock);
- hinfo->pde = create_proc_entry(minfo->name, 0,
- family == AF_INET ? hashlimit_procdir4 :
- hashlimit_procdir6);
- if (!hinfo->pde) {
+
+ hinfo->pde = proc_create_data(minfo->name, 0,
+ (family == NFPROTO_IPV4) ?
+ hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit,
+ &dl_file_ops, hinfo);
+ if (hinfo->pde == NULL) {
vfree(hinfo);
- return -1;
+ return -ENOMEM;
}
- hinfo->pde->proc_fops = &dl_file_ops;
- hinfo->pde->data = hinfo;
+ hinfo->net = net;
- setup_timer(&hinfo->timer, htable_gc, (unsigned long )hinfo);
+ setup_timer(&hinfo->timer, htable_gc, (unsigned long)hinfo);
hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval);
add_timer(&hinfo->timer);
- spin_lock_bh(&hashlimit_lock);
- hlist_add_head(&hinfo->node, &hashlimit_htables);
- spin_unlock_bh(&hashlimit_lock);
+ hlist_add_head(&hinfo->node, &hashlimit_net->htables);
return 0;
}
static void htable_destroy(struct xt_hashlimit_htable *hinfo)
{
- /* remove timer, if it is pending */
- if (timer_pending(&hinfo->timer))
- del_timer(&hinfo->timer);
+ struct hashlimit_net *hashlimit_net = hashlimit_pernet(hinfo->net);
+ struct proc_dir_entry *parent;
+
+ del_timer_sync(&hinfo->timer);
- /* remove proc entry */
- remove_proc_entry(hinfo->pde->name,
- hinfo->family == AF_INET ? hashlimit_procdir4 :
- hashlimit_procdir6);
+ if (hinfo->family == NFPROTO_IPV4)
+ parent = hashlimit_net->ipt_hashlimit;
+ else
+ parent = hashlimit_net->ip6t_hashlimit;
+ remove_proc_entry(hinfo->pde->name, parent);
htable_selective_cleanup(hinfo, select_all);
vfree(hinfo);
}
-static struct xt_hashlimit_htable *htable_find_get(const char *name,
- int family)
+static struct xt_hashlimit_htable *htable_find_get(struct net *net,
+ const char *name,
+ u_int8_t family)
{
+ struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
struct xt_hashlimit_htable *hinfo;
struct hlist_node *pos;
- spin_lock_bh(&hashlimit_lock);
- hlist_for_each_entry(hinfo, pos, &hashlimit_htables, node) {
+ hlist_for_each_entry(hinfo, pos, &hashlimit_net->htables, node) {
if (!strcmp(name, hinfo->pde->name) &&
hinfo->family == family) {
- atomic_inc(&hinfo->use);
- spin_unlock_bh(&hashlimit_lock);
+ hinfo->use++;
return hinfo;
}
}
- spin_unlock_bh(&hashlimit_lock);
return NULL;
}
static void htable_put(struct xt_hashlimit_htable *hinfo)
{
- if (atomic_dec_and_test(&hinfo->use)) {
- spin_lock_bh(&hashlimit_lock);
+ mutex_lock(&hashlimit_mutex);
+ if (--hinfo->use == 0) {
hlist_del(&hinfo->node);
- spin_unlock_bh(&hashlimit_lock);
htable_destroy(hinfo);
}
+ mutex_unlock(&hashlimit_mutex);
}
/* The algorithm used is the Simple Token Bucket Filter (TBF)
dh->rateinfo.prev = now;
}
+static inline __be32 maskl(__be32 a, unsigned int l)
+{
+ return l ? htonl(ntohl(a) & ~0 << (32 - l)) : 0;
+}
+
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
+static void hashlimit_ipv6_mask(__be32 *i, unsigned int p)
+{
+ switch (p) {
+ case 0 ... 31:
+ i[0] = maskl(i[0], p);
+ i[1] = i[2] = i[3] = 0;
+ break;
+ case 32 ... 63:
+ i[1] = maskl(i[1], p - 32);
+ i[2] = i[3] = 0;
+ break;
+ case 64 ... 95:
+ i[2] = maskl(i[2], p - 64);
+ i[3] = 0;
+ break;
+ case 96 ... 127:
+ i[3] = maskl(i[3], p - 96);
+ break;
+ case 128:
+ break;
+ }
+}
+#endif
+
static int
hashlimit_init_dst(const struct xt_hashlimit_htable *hinfo,
struct dsthash_dst *dst,
memset(dst, 0, sizeof(*dst));
switch (hinfo->family) {
- case AF_INET:
+ case NFPROTO_IPV4:
if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP)
- dst->addr.ip.dst = ip_hdr(skb)->daddr;
+ dst->ip.dst = maskl(ip_hdr(skb)->daddr,
+ hinfo->cfg.dstmask);
if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP)
- dst->addr.ip.src = ip_hdr(skb)->saddr;
+ dst->ip.src = maskl(ip_hdr(skb)->saddr,
+ hinfo->cfg.srcmask);
if (!(hinfo->cfg.mode &
(XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT)))
nexthdr = ip_hdr(skb)->protocol;
break;
#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
- case AF_INET6:
- if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP)
- memcpy(&dst->addr.ip6.dst, &ipv6_hdr(skb)->daddr,
- sizeof(dst->addr.ip6.dst));
- if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP)
- memcpy(&dst->addr.ip6.src, &ipv6_hdr(skb)->saddr,
- sizeof(dst->addr.ip6.src));
+ case NFPROTO_IPV6:
+ if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP) {
+ memcpy(&dst->ip6.dst, &ipv6_hdr(skb)->daddr,
+ sizeof(dst->ip6.dst));
+ hashlimit_ipv6_mask(dst->ip6.dst, hinfo->cfg.dstmask);
+ }
+ if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP) {
+ memcpy(&dst->ip6.src, &ipv6_hdr(skb)->saddr,
+ sizeof(dst->ip6.src));
+ hashlimit_ipv6_mask(dst->ip6.src, hinfo->cfg.srcmask);
+ }
if (!(hinfo->cfg.mode &
(XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT)))
}
static bool
-hashlimit_mt(const struct sk_buff *skb, const struct net_device *in,
- const struct net_device *out, const struct xt_match *match,
- const void *matchinfo, int offset, unsigned int protoff,
- bool *hotdrop)
-{
- const struct xt_hashlimit_info *r =
- ((const struct xt_hashlimit_info *)matchinfo)->u.master;
- struct xt_hashlimit_htable *hinfo = r->hinfo;
+hashlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
+ struct xt_hashlimit_htable *hinfo = info->hinfo;
unsigned long now = jiffies;
struct dsthash_ent *dh;
struct dsthash_dst dst;
- if (hashlimit_init_dst(hinfo, &dst, skb, protoff) < 0)
+ if (hashlimit_init_dst(hinfo, &dst, skb, par->thoff) < 0)
goto hotdrop;
- spin_lock_bh(&hinfo->lock);
+ rcu_read_lock_bh();
dh = dsthash_find(hinfo, &dst);
- if (!dh) {
+ if (dh == NULL) {
dh = dsthash_alloc_init(hinfo, &dst);
- if (!dh) {
- spin_unlock_bh(&hinfo->lock);
+ if (dh == NULL) {
+ rcu_read_unlock_bh();
goto hotdrop;
}
-
dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire);
dh->rateinfo.prev = jiffies;
dh->rateinfo.credit = user2credits(hinfo->cfg.avg *
- hinfo->cfg.burst);
+ hinfo->cfg.burst);
dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg *
- hinfo->cfg.burst);
+ hinfo->cfg.burst);
dh->rateinfo.cost = user2credits(hinfo->cfg.avg);
} else {
/* update expiration timeout */
}
if (dh->rateinfo.credit >= dh->rateinfo.cost) {
- /* We're underlimit. */
+ /* below the limit */
dh->rateinfo.credit -= dh->rateinfo.cost;
- spin_unlock_bh(&hinfo->lock);
- return true;
+ spin_unlock(&dh->lock);
+ rcu_read_unlock_bh();
+ return !(info->cfg.mode & XT_HASHLIMIT_INVERT);
}
- spin_unlock_bh(&hinfo->lock);
-
- /* default case: we're overlimit, thus don't match */
- return false;
+ spin_unlock(&dh->lock);
+ rcu_read_unlock_bh();
+ /* default match is underlimit - so over the limit, we need to invert */
+ return info->cfg.mode & XT_HASHLIMIT_INVERT;
-hotdrop:
- *hotdrop = true;
+ hotdrop:
+ par->hotdrop = true;
return false;
}
-static bool
-hashlimit_mt_check(const char *tablename, const void *inf,
- const struct xt_match *match, void *matchinfo,
- unsigned int hook_mask)
+static int hashlimit_mt_check(const struct xt_mtchk_param *par)
{
- struct xt_hashlimit_info *r = matchinfo;
+ struct net *net = par->net;
+ struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
+ int ret;
/* Check for overflow. */
- 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",
- r->cfg.avg, r->cfg.burst);
- return false;
+ if (info->cfg.burst == 0 ||
+ user2credits(info->cfg.avg * info->cfg.burst) <
+ user2credits(info->cfg.avg)) {
+ pr_info("overflow, try lower: %u/%u\n",
+ info->cfg.avg, info->cfg.burst);
+ return -ERANGE;
}
- if (r->cfg.mode == 0 ||
- r->cfg.mode > (XT_HASHLIMIT_HASH_DPT |
- XT_HASHLIMIT_HASH_DIP |
- XT_HASHLIMIT_HASH_SIP |
- XT_HASHLIMIT_HASH_SPT))
- return false;
- if (!r->cfg.gc_interval)
- return false;
- if (!r->cfg.expire)
- return false;
- if (r->name[sizeof(r->name) - 1] != '\0')
- return false;
-
- /* This is the best we've got: We cannot release and re-grab lock,
- * since checkentry() is called before x_tables.c grabs xt_mutex.
- * We also cannot grab the hashtable spinlock, since htable_create will
- * 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 */
- mutex_lock(&hlimit_mutex);
- r->hinfo = htable_find_get(r->name, match->family);
- if (!r->hinfo && htable_create(r, match->family) != 0) {
- mutex_unlock(&hlimit_mutex);
- return false;
+ if (info->cfg.gc_interval == 0 || info->cfg.expire == 0)
+ return -EINVAL;
+ if (info->name[sizeof(info->name)-1] != '\0')
+ return -EINVAL;
+ if (par->family == NFPROTO_IPV4) {
+ if (info->cfg.srcmask > 32 || info->cfg.dstmask > 32)
+ return -EINVAL;
+ } else {
+ if (info->cfg.srcmask > 128 || info->cfg.dstmask > 128)
+ return -EINVAL;
}
- mutex_unlock(&hlimit_mutex);
- /* Ugly hack: For SMP, we only want to use one set */
- r->u.master = r;
- return true;
-}
-
-static void
-hashlimit_mt_destroy(const struct xt_match *match, void *matchinfo)
-{
- const struct xt_hashlimit_info *r = matchinfo;
-
- htable_put(r->hinfo);
-}
-
-#ifdef CONFIG_COMPAT
-struct compat_xt_hashlimit_info {
- char name[IFNAMSIZ];
- struct hashlimit_cfg cfg;
- compat_uptr_t hinfo;
- compat_uptr_t master;
-};
-
-static void hashlimit_mt_compat_from_user(void *dst, void *src)
-{
- int off = offsetof(struct compat_xt_hashlimit_info, hinfo);
-
- memcpy(dst, src, off);
- memset(dst + off, 0, sizeof(struct compat_xt_hashlimit_info) - off);
+ mutex_lock(&hashlimit_mutex);
+ info->hinfo = htable_find_get(net, info->name, par->family);
+ if (info->hinfo == NULL) {
+ ret = htable_create(net, info, par->family);
+ if (ret < 0) {
+ mutex_unlock(&hashlimit_mutex);
+ return ret;
+ }
+ }
+ mutex_unlock(&hashlimit_mutex);
+ return 0;
}
-static int hashlimit_mt_compat_to_user(void __user *dst, void *src)
+static void hashlimit_mt_destroy(const struct xt_mtdtor_param *par)
{
- int off = offsetof(struct compat_xt_hashlimit_info, hinfo);
+ const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
- return copy_to_user(dst, src, off) ? -EFAULT : 0;
+ htable_put(info->hinfo);
}
-#endif
static struct xt_match hashlimit_mt_reg[] __read_mostly = {
{
- .name = "hashlimit",
- .family = AF_INET,
- .match = hashlimit_mt,
- .matchsize = sizeof(struct xt_hashlimit_info),
-#ifdef CONFIG_COMPAT
- .compatsize = sizeof(struct compat_xt_hashlimit_info),
- .compat_from_user = hashlimit_mt_compat_from_user,
- .compat_to_user = hashlimit_mt_compat_to_user,
-#endif
- .checkentry = hashlimit_mt_check,
- .destroy = hashlimit_mt_destroy,
- .me = THIS_MODULE
+ .name = "hashlimit",
+ .revision = 1,
+ .family = NFPROTO_IPV4,
+ .match = hashlimit_mt,
+ .matchsize = sizeof(struct xt_hashlimit_mtinfo1),
+ .checkentry = hashlimit_mt_check,
+ .destroy = hashlimit_mt_destroy,
+ .me = THIS_MODULE,
},
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
{
- .name = "hashlimit",
- .family = AF_INET6,
- .match = hashlimit_mt,
- .matchsize = sizeof(struct xt_hashlimit_info),
-#ifdef CONFIG_COMPAT
- .compatsize = sizeof(struct compat_xt_hashlimit_info),
- .compat_from_user = hashlimit_mt_compat_from_user,
- .compat_to_user = hashlimit_mt_compat_to_user,
-#endif
- .checkentry = hashlimit_mt_check,
- .destroy = hashlimit_mt_destroy,
- .me = THIS_MODULE
+ .name = "hashlimit",
+ .revision = 1,
+ .family = NFPROTO_IPV6,
+ .match = hashlimit_mt,
+ .matchsize = sizeof(struct xt_hashlimit_mtinfo1),
+ .checkentry = hashlimit_mt_check,
+ .destroy = hashlimit_mt_destroy,
+ .me = THIS_MODULE,
},
+#endif
};
/* PROC stuff */
static void *dl_seq_start(struct seq_file *s, loff_t *pos)
+ __acquires(htable->lock)
{
- struct proc_dir_entry *pde = s->private;
- struct xt_hashlimit_htable *htable = pde->data;
+ struct xt_hashlimit_htable *htable = s->private;
unsigned int *bucket;
spin_lock_bh(&htable->lock);
static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
- struct proc_dir_entry *pde = s->private;
- struct xt_hashlimit_htable *htable = pde->data;
+ struct xt_hashlimit_htable *htable = s->private;
unsigned int *bucket = (unsigned int *)v;
*pos = ++(*bucket);
}
static void dl_seq_stop(struct seq_file *s, void *v)
+ __releases(htable->lock)
{
- struct proc_dir_entry *pde = s->private;
- struct xt_hashlimit_htable *htable = pde->data;
+ struct xt_hashlimit_htable *htable = s->private;
unsigned int *bucket = (unsigned int *)v;
- kfree(bucket);
+ if (!IS_ERR(bucket))
+ kfree(bucket);
spin_unlock_bh(&htable->lock);
}
-static int dl_seq_real_show(struct dsthash_ent *ent, int family,
+static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
{
+ int res;
+
+ spin_lock(&ent->lock);
/* recalculate to show accurate numbers */
rateinfo_recalc(ent, jiffies);
switch (family) {
- case AF_INET:
- return seq_printf(s, "%ld %u.%u.%u.%u:%u->"
- "%u.%u.%u.%u:%u %u %u %u\n",
+ case NFPROTO_IPV4:
+ res = seq_printf(s, "%ld %pI4:%u->%pI4:%u %u %u %u\n",
(long)(ent->expires - jiffies)/HZ,
- NIPQUAD(ent->dst.addr.ip.src),
+ &ent->dst.ip.src,
ntohs(ent->dst.src_port),
- NIPQUAD(ent->dst.addr.ip.dst),
+ &ent->dst.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",
+ break;
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
+ case NFPROTO_IPV6:
+ res = seq_printf(s, "%ld %pI6:%u->%pI6:%u %u %u %u\n",
(long)(ent->expires - jiffies)/HZ,
- NIP6(*(struct in6_addr *)&ent->dst.addr.ip6.src),
+ &ent->dst.ip6.src,
ntohs(ent->dst.src_port),
- NIP6(*(struct in6_addr *)&ent->dst.addr.ip6.dst),
+ &ent->dst.ip6.dst,
ntohs(ent->dst.dst_port),
ent->rateinfo.credit, ent->rateinfo.credit_cap,
ent->rateinfo.cost);
+ break;
+#endif
default:
BUG();
- return 0;
+ res = 0;
}
+ spin_unlock(&ent->lock);
+ return res;
}
static int dl_seq_show(struct seq_file *s, void *v)
{
- struct proc_dir_entry *pde = s->private;
- struct xt_hashlimit_htable *htable = pde->data;
+ struct xt_hashlimit_htable *htable = s->private;
unsigned int *bucket = (unsigned int *)v;
struct dsthash_ent *ent;
struct hlist_node *pos;
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))
- return 1;
+ return -1;
}
return 0;
}
if (!ret) {
struct seq_file *sf = file->private_data;
- sf->private = PDE(inode);
+ sf->private = PDE(inode)->data;
}
return ret;
}
.release = seq_release
};
+static int __net_init hashlimit_proc_net_init(struct net *net)
+{
+ struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
+
+ hashlimit_net->ipt_hashlimit = proc_mkdir("ipt_hashlimit", net->proc_net);
+ if (!hashlimit_net->ipt_hashlimit)
+ return -ENOMEM;
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
+ hashlimit_net->ip6t_hashlimit = proc_mkdir("ip6t_hashlimit", net->proc_net);
+ if (!hashlimit_net->ip6t_hashlimit) {
+ proc_net_remove(net, "ipt_hashlimit");
+ return -ENOMEM;
+ }
+#endif
+ return 0;
+}
+
+static void __net_exit hashlimit_proc_net_exit(struct net *net)
+{
+ proc_net_remove(net, "ipt_hashlimit");
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
+ proc_net_remove(net, "ip6t_hashlimit");
+#endif
+}
+
+static int __net_init hashlimit_net_init(struct net *net)
+{
+ struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
+
+ INIT_HLIST_HEAD(&hashlimit_net->htables);
+ return hashlimit_proc_net_init(net);
+}
+
+static void __net_exit hashlimit_net_exit(struct net *net)
+{
+ struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
+
+ BUG_ON(!hlist_empty(&hashlimit_net->htables));
+ hashlimit_proc_net_exit(net);
+}
+
+static struct pernet_operations hashlimit_net_ops = {
+ .init = hashlimit_net_init,
+ .exit = hashlimit_net_exit,
+ .id = &hashlimit_net_id,
+ .size = sizeof(struct hashlimit_net),
+};
+
static int __init hashlimit_mt_init(void)
{
int err;
+ err = register_pernet_subsys(&hashlimit_net_ops);
+ if (err < 0)
+ return err;
err = xt_register_matches(hashlimit_mt_reg,
ARRAY_SIZE(hashlimit_mt_reg));
if (err < 0)
sizeof(struct dsthash_ent), 0, 0,
NULL);
if (!hashlimit_cachep) {
- printk(KERN_ERR "xt_hashlimit: unable to create slab cache\n");
+ pr_warning("unable to create slab cache\n");
goto err2;
}
- hashlimit_procdir4 = proc_mkdir("ipt_hashlimit", init_net.proc_net);
- if (!hashlimit_procdir4) {
- printk(KERN_ERR "xt_hashlimit: unable to create proc dir "
- "entry\n");
- goto err3;
- }
- hashlimit_procdir6 = proc_mkdir("ip6t_hashlimit", init_net.proc_net);
- if (!hashlimit_procdir6) {
- printk(KERN_ERR "xt_hashlimit: unable to create proc dir "
- "entry\n");
- goto err4;
- }
return 0;
-err4:
- remove_proc_entry("ipt_hashlimit", init_net.proc_net);
-err3:
- kmem_cache_destroy(hashlimit_cachep);
+
err2:
xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg));
err1:
+ unregister_pernet_subsys(&hashlimit_net_ops);
return err;
}
static void __exit hashlimit_mt_exit(void)
{
- remove_proc_entry("ipt_hashlimit", init_net.proc_net);
- remove_proc_entry("ip6t_hashlimit", init_net.proc_net);
- kmem_cache_destroy(hashlimit_cachep);
xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg));
+ unregister_pernet_subsys(&hashlimit_net_ops);
+
+ rcu_barrier_bh();
+ kmem_cache_destroy(hashlimit_cachep);
}
module_init(hashlimit_mt_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff