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-rw-r--r--include/linux/netfilter/Kbuild1
-rw-r--r--include/linux/netfilter/xt_hashlimit.h40
-rw-r--r--include/linux/netfilter_ipv4/ipt_hashlimit.h42
-rw-r--r--net/ipv4/netfilter/Kconfig14
-rw-r--r--net/ipv4/netfilter/Makefile1
-rw-r--r--net/netfilter/Kconfig14
-rw-r--r--net/netfilter/Makefile1
-rw-r--r--net/netfilter/xt_hashlimit.c (renamed from net/ipv4/netfilter/ipt_hashlimit.c)511
8 files changed, 339 insertions, 285 deletions
diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild
index 312bd2ffee3..e379a2d89ea 100644
--- a/include/linux/netfilter/Kbuild
+++ b/include/linux/netfilter/Kbuild
@@ -14,6 +14,7 @@ header-y += xt_dscp.h
header-y += xt_DSCP.h
header-y += xt_esp.h
header-y += xt_helper.h
+header-y += xt_hashlimit.h
header-y += xt_length.h
header-y += xt_limit.h
header-y += xt_mac.h
diff --git a/include/linux/netfilter/xt_hashlimit.h b/include/linux/netfilter/xt_hashlimit.h
new file mode 100644
index 00000000000..b4556b8edbf
--- /dev/null
+++ b/include/linux/netfilter/xt_hashlimit.h
@@ -0,0 +1,40 @@
+#ifndef _XT_HASHLIMIT_H
+#define _XT_HASHLIMIT_H
+
+/* timings are in milliseconds. */
+#define XT_HASHLIMIT_SCALE 10000
+/* 1/10,000 sec period => max of 10,000/sec. Min rate is then 429490
+ seconds, or one every 59 hours. */
+
+/* details of this structure hidden by the implementation */
+struct xt_hashlimit_htable;
+
+#define XT_HASHLIMIT_HASH_DIP 0x0001
+#define XT_HASHLIMIT_HASH_DPT 0x0002
+#define XT_HASHLIMIT_HASH_SIP 0x0004
+#define XT_HASHLIMIT_HASH_SPT 0x0008
+
+struct hashlimit_cfg {
+ u_int32_t mode; /* bitmask of IPT_HASHLIMIT_HASH_* */
+ u_int32_t avg; /* Average secs between packets * scale */
+ u_int32_t burst; /* Period multiplier for upper limit. */
+
+ /* user specified */
+ u_int32_t size; /* how many buckets */
+ u_int32_t max; /* max number of entries */
+ u_int32_t gc_interval; /* gc interval */
+ u_int32_t expire; /* when do entries expire? */
+};
+
+struct xt_hashlimit_info {
+ char name [IFNAMSIZ]; /* name */
+ struct hashlimit_cfg cfg;
+ struct xt_hashlimit_htable *hinfo;
+
+ /* Used internally by the kernel */
+ union {
+ void *ptr;
+ struct xt_hashlimit_info *master;
+ } u;
+};
+#endif /*_XT_HASHLIMIT_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_hashlimit.h b/include/linux/netfilter_ipv4/ipt_hashlimit.h
index ac2cb64ecd7..5662120a3d7 100644
--- a/include/linux/netfilter_ipv4/ipt_hashlimit.h
+++ b/include/linux/netfilter_ipv4/ipt_hashlimit.h
@@ -1,40 +1,14 @@
#ifndef _IPT_HASHLIMIT_H
#define _IPT_HASHLIMIT_H
-/* timings are in milliseconds. */
-#define IPT_HASHLIMIT_SCALE 10000
-/* 1/10,000 sec period => max of 10,000/sec. Min rate is then 429490
- seconds, or one every 59 hours. */
+#include <linux/netfilter/xt_hashlimit.h>
-/* details of this structure hidden by the implementation */
-struct ipt_hashlimit_htable;
+#define IPT_HASHLIMIT_SCALE XT_HASHLIMIT_SCALE
+#define IPT_HASHLIMIT_HASH_DIP XT_HASHLIMIT_HASH_DIP
+#define IPT_HASHLIMIT_HASH_DPT XT_HASHLIMIT_HASH_DPT
+#define IPT_HASHLIMIT_HASH_SIP XT_HASHLIMIT_HASH_SIP
+#define IPT_HASHLIMIT_HASH_SPT XT_HASHLIMIT_HASH_SPT
-#define IPT_HASHLIMIT_HASH_DIP 0x0001
-#define IPT_HASHLIMIT_HASH_DPT 0x0002
-#define IPT_HASHLIMIT_HASH_SIP 0x0004
-#define IPT_HASHLIMIT_HASH_SPT 0x0008
+#define ipt_hashlimit_info xt_hashlimit_info
-struct hashlimit_cfg {
- u_int32_t mode; /* bitmask of IPT_HASHLIMIT_HASH_* */
- u_int32_t avg; /* Average secs between packets * scale */
- u_int32_t burst; /* Period multiplier for upper limit. */
-
- /* user specified */
- u_int32_t size; /* how many buckets */
- u_int32_t max; /* max number of entries */
- u_int32_t gc_interval; /* gc interval */
- u_int32_t expire; /* when do entries expire? */
-};
-
-struct ipt_hashlimit_info {
- char name [IFNAMSIZ]; /* name */
- struct hashlimit_cfg cfg;
- struct ipt_hashlimit_htable *hinfo;
-
- /* Used internally by the kernel */
- union {
- void *ptr;
- struct ipt_hashlimit_info *master;
- } u;
-};
-#endif /*_IPT_HASHLIMIT_H*/
+#endif /* _IPT_HASHLIMIT_H */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 4ac5b5c4678..bc298a3f236 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -326,20 +326,6 @@ config IP_NF_MATCH_ADDRTYPE
If you want to compile it as a module, say M here and read
<file:Documentation/modules.txt>. If unsure, say `N'.
-config IP_NF_MATCH_HASHLIMIT
- tristate 'hashlimit match support'
- depends on IP_NF_IPTABLES
- help
- This option adds a new iptables `hashlimit' match.
-
- As opposed to `limit', this match dynamically creates a hash table
- of limit buckets, based on your selection of source/destination
- ip addresses and/or ports.
-
- It enables you to express policies like `10kpps for any given
- destination IP' or `500pps from any given source IP' with a single
- IPtables rule.
-
# `filter', generic and specific targets
config IP_NF_FILTER
tristate "Packet filtering"
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 4ce20ebc4d6..21359d83f0c 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -53,7 +53,6 @@ obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o
obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
# matches
-obj-$(CONFIG_IP_NF_MATCH_HASHLIMIT) += ipt_hashlimit.o
obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o
obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f619c652726..7e6125467c1 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -464,5 +464,19 @@ config NETFILTER_XT_MATCH_TCPMSS
To compile it as a module, choose M here. If unsure, say N.
+config NETFILTER_XT_MATCH_HASHLIMIT
+ tristate '"hashlimit" match support'
+ depends on NETFILTER_XTABLES
+ help
+ This option adds a `hashlimit' match.
+
+ As opposed to `limit', this match dynamically creates a hash table
+ of limit buckets, based on your selection of source/destination
+ addresses and/or ports.
+
+ It enables you to express policies like `10kpps for any given
+ destination address' or `500pps from any given source address'
+ with a single rule.
+
endmenu
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 84d529ded95..f85811bfcfe 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -59,3 +59,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STATISTIC) += xt_statistic.o
obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o
obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o
obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o
diff --git a/net/ipv4/netfilter/ipt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 33ccdbf8e79..46de566d372 100644
--- a/net/ipv4/netfilter/ipt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -6,23 +6,8 @@
* $Id: ipt_hashlimit.c 3244 2004-10-20 16:24:29Z laforge@netfilter.org $
*
* Development of this code was funded by Astaro AG, http://www.astaro.com/
- *
- * based on ipt_limit.c by:
- * Jérôme de Vivie <devivie@info.enserb.u-bordeaux.fr>
- * Hervé Eychenne <eychenne@info.enserb.u-bordeaux.fr>
- * Rusty Russell <rusty@rustcorp.com.au>
- *
- * The general idea is to create a hash table for every dstip and have a
- * seperate limit counter per tuple. This way you can do something like 'limit
- * the number of syn packets for each of my internal addresses.
- *
- * Ideally this would just be implemented as a general 'hash' match, which would
- * allow us to attach any iptables target to it's hash buckets. But this is
- * not possible in the current iptables architecture. As always, pkttables for
- * 2.7.x will help ;)
*/
#include <linux/module.h>
-#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/random.h>
#include <linux/jhash.h>
@@ -31,28 +16,40 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ipt_hashlimit.h>
-
-/* FIXME: this is just for IP_NF_ASSERRT */
-#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/xt_hashlimit.h>
#include <linux/mutex.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("iptables match for limiting per hash-bucket");
+MODULE_ALIAS("ipt_hashlimit");
+MODULE_ALIAS("ip6t_hashlimit");
/* need to declare this at the top */
-static struct proc_dir_entry *hashlimit_procdir;
+static struct proc_dir_entry *hashlimit_procdir4;
+static struct proc_dir_entry *hashlimit_procdir6;
static struct file_operations dl_file_ops;
/* hash table crap */
-
struct dsthash_dst {
- __be32 src_ip;
- __be32 dst_ip;
- /* ports have to be consecutive !!! */
+ union {
+ struct {
+ __be32 src;
+ __be32 dst;
+ } ip;
+ struct {
+ __be32 src[4];
+ __be32 dst[4];
+ } ip6;
+ } addr;
__be16 src_port;
__be16 dst_port;
};
@@ -71,9 +68,10 @@ struct dsthash_ent {
} rateinfo;
};
-struct ipt_hashlimit_htable {
+struct xt_hashlimit_htable {
struct hlist_node node; /* global list of all htables */
atomic_t use;
+ int family;
struct hashlimit_cfg cfg; /* config */
@@ -81,8 +79,8 @@ struct ipt_hashlimit_htable {
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 */
- atomic_t count; /* number entries in table */
/* seq_file stuff */
struct proc_dir_entry *pde;
@@ -97,41 +95,33 @@ static kmem_cache_t *hashlimit_cachep __read_mostly;
static inline int dst_cmp(const struct dsthash_ent *ent, struct dsthash_dst *b)
{
- return (ent->dst.dst_ip == b->dst_ip
- && ent->dst.dst_port == b->dst_port
- && ent->dst.src_port == b->src_port
- && ent->dst.src_ip == b->src_ip);
+ return !memcmp(&ent->dst, b, sizeof(ent->dst));
}
-static inline u_int32_t
-hash_dst(const struct ipt_hashlimit_htable *ht, const struct dsthash_dst *dst)
+static u_int32_t
+hash_dst(const struct xt_hashlimit_htable *ht, const struct dsthash_dst *dst)
{
- return (jhash_3words((__force u32)dst->dst_ip,
- ((__force u32)dst->dst_port<<16 |
- (__force u32)dst->src_port),
- (__force u32)dst->src_ip, ht->rnd) % ht->cfg.size);
+ return jhash(dst, sizeof(*dst), ht->rnd) % ht->cfg.size;
}
-static inline struct dsthash_ent *
-__dsthash_find(const struct ipt_hashlimit_htable *ht, struct dsthash_dst *dst)
+static struct dsthash_ent *
+dsthash_find(const struct xt_hashlimit_htable *ht, struct dsthash_dst *dst)
{
struct dsthash_ent *ent;
struct hlist_node *pos;
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)) {
+ if (!hlist_empty(&ht->hash[hash])) {
+ hlist_for_each_entry(ent, pos, &ht->hash[hash], node)
+ if (dst_cmp(ent, dst))
return ent;
- }
- }
-
+ }
return NULL;
}
/* allocate dsthash_ent, initialize dst, put in htable and lock it */
static struct dsthash_ent *
-__dsthash_alloc_init(struct ipt_hashlimit_htable *ht, struct dsthash_dst *dst)
+dsthash_alloc_init(struct xt_hashlimit_htable *ht, struct dsthash_dst *dst)
{
struct dsthash_ent *ent;
@@ -142,12 +132,11 @@ __dsthash_alloc_init(struct ipt_hashlimit_htable *ht, struct dsthash_dst *dst)
ht->rnd_initialized = 1;
}
- if (ht->cfg.max &&
- atomic_read(&ht->count) >= ht->cfg.max) {
+ if (ht->cfg.max && ht->count >= ht->cfg.max) {
/* FIXME: do something. question is what.. */
if (net_ratelimit())
- printk(KERN_WARNING
- "ipt_hashlimit: max count of %u reached\n",
+ printk(KERN_WARNING
+ "xt_hashlimit: max count of %u reached\n",
ht->cfg.max);
return NULL;
}
@@ -155,53 +144,47 @@ __dsthash_alloc_init(struct ipt_hashlimit_htable *ht, struct dsthash_dst *dst)
ent = kmem_cache_alloc(hashlimit_cachep, GFP_ATOMIC);
if (!ent) {
if (net_ratelimit())
- printk(KERN_ERR
- "ipt_hashlimit: can't allocate dsthash_ent\n");
+ printk(KERN_ERR
+ "xt_hashlimit: can't allocate dsthash_ent\n");
return NULL;
}
-
- atomic_inc(&ht->count);
-
- ent->dst.dst_ip = dst->dst_ip;
- ent->dst.dst_port = dst->dst_port;
- ent->dst.src_ip = dst->src_ip;
- ent->dst.src_port = dst->src_port;
+ memcpy(&ent->dst, dst, sizeof(ent->dst));
hlist_add_head(&ent->node, &ht->hash[hash_dst(ht, dst)]);
-
+ ht->count++;
return ent;
}
-static inline void
-__dsthash_free(struct ipt_hashlimit_htable *ht, struct dsthash_ent *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);
- atomic_dec(&ht->count);
+ ht->count--;
}
static void htable_gc(unsigned long htlong);
-static int htable_create(struct ipt_hashlimit_info *minfo)
+static int htable_create(struct xt_hashlimit_info *minfo, int family)
{
- int i;
+ struct xt_hashlimit_htable *hinfo;
unsigned int size;
- struct ipt_hashlimit_htable *hinfo;
+ unsigned int i;
if (minfo->cfg.size)
size = minfo->cfg.size;
else {
- size = (((num_physpages << PAGE_SHIFT) / 16384)
- / sizeof(struct list_head));
+ size = ((num_physpages << PAGE_SHIFT) / 16384) /
+ sizeof(struct list_head);
if (num_physpages > (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 ipt_hashlimit_htable)
- + (sizeof(struct list_head) * size));
+ hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) +
+ sizeof(struct list_head) * size);
if (!hinfo) {
- printk(KERN_ERR "ipt_hashlimit: Unable to create hashtable\n");
+ printk(KERN_ERR "xt_hashlimit: unable to create hashtable\n");
return -1;
}
minfo->hinfo = hinfo;
@@ -217,11 +200,14 @@ static int htable_create(struct ipt_hashlimit_info *minfo)
for (i = 0; i < hinfo->cfg.size; i++)
INIT_HLIST_HEAD(&hinfo->hash[i]);
- atomic_set(&hinfo->count, 0);
atomic_set(&hinfo->use, 1);
+ hinfo->count = 0;
+ hinfo->family = family;
hinfo->rnd_initialized = 0;
spin_lock_init(&hinfo->lock);
- hinfo->pde = create_proc_entry(minfo->name, 0, hashlimit_procdir);
+ hinfo->pde = create_proc_entry(minfo->name, 0,
+ family == AF_INET ? hashlimit_procdir4 :
+ hashlimit_procdir6);
if (!hinfo->pde) {
vfree(hinfo);
return -1;
@@ -242,23 +228,21 @@ static int htable_create(struct ipt_hashlimit_info *minfo)
return 0;
}
-static int select_all(struct ipt_hashlimit_htable *ht, struct dsthash_ent *he)
+static int select_all(struct xt_hashlimit_htable *ht, struct dsthash_ent *he)
{
return 1;
}
-static int select_gc(struct ipt_hashlimit_htable *ht, struct dsthash_ent *he)
+static int select_gc(struct xt_hashlimit_htable *ht, struct dsthash_ent *he)
{
return (jiffies >= he->expires);
}
-static void htable_selective_cleanup(struct ipt_hashlimit_htable *ht,
- int (*select)(struct ipt_hashlimit_htable *ht,
+static void htable_selective_cleanup(struct xt_hashlimit_htable *ht,
+ int (*select)(struct xt_hashlimit_htable *ht,
struct dsthash_ent *he))
{
- int i;
-
- IP_NF_ASSERT(ht->cfg.size && ht->cfg.max);
+ unsigned int i;
/* lock hash table and iterate over it */
spin_lock_bh(&ht->lock);
@@ -267,7 +251,7 @@ static void htable_selective_cleanup(struct ipt_hashlimit_htable *ht,
struct hlist_node *pos, *n;
hlist_for_each_entry_safe(dh, pos, n, &ht->hash[i], node) {
if ((*select)(ht, dh))
- __dsthash_free(ht, dh);
+ dsthash_free(ht, dh);
}
}
spin_unlock_bh(&ht->lock);
@@ -276,7 +260,7 @@ static void htable_selective_cleanup(struct ipt_hashlimit_htable *ht,
/* hash table garbage collector, run by timer */
static void htable_gc(unsigned long htlong)
{
- struct ipt_hashlimit_htable *ht = (struct ipt_hashlimit_htable *)htlong;
+ struct xt_hashlimit_htable *ht = (struct xt_hashlimit_htable *)htlong;
htable_selective_cleanup(ht, select_gc);
@@ -285,38 +269,39 @@ static void htable_gc(unsigned long htlong)
add_timer(&ht->timer);
}
-static void htable_destroy(struct ipt_hashlimit_htable *hinfo)
+static void htable_destroy(struct xt_hashlimit_htable *hinfo)
{
/* remove timer, if it is pending */
if (timer_pending(&hinfo->timer))
del_timer(&hinfo->timer);
/* remove proc entry */
- remove_proc_entry(hinfo->pde->name, hashlimit_procdir);
-
+ remove_proc_entry(hinfo->pde->name,
+ hinfo->family == AF_INET ? hashlimit_procdir4 :
+ hashlimit_procdir6);
htable_selective_cleanup(hinfo, select_all);
vfree(hinfo);
}
-static struct ipt_hashlimit_htable *htable_find_get(char *name)
+static struct xt_hashlimit_htable *htable_find_get(char *name, int family)
{
- struct ipt_hashlimit_htable *hinfo;
+ struct xt_hashlimit_htable *hinfo;
struct hlist_node *pos;
spin_lock_bh(&hashlimit_lock);
hlist_for_each_entry(hinfo, pos, &hashlimit_htables, node) {
- if (!strcmp(name, hinfo->pde->name)) {
+ if (!strcmp(name, hinfo->pde->name) &&
+ hinfo->family == family) {
atomic_inc(&hinfo->use);
spin_unlock_bh(&hashlimit_lock);
return hinfo;
}
}
spin_unlock_bh(&hashlimit_lock);
-
return NULL;
}
-static void htable_put(struct ipt_hashlimit_htable *hinfo)
+static void htable_put(struct xt_hashlimit_htable *hinfo)
{
if (atomic_dec_and_test(&hinfo->use)) {
spin_lock_bh(&hashlimit_lock);
@@ -326,7 +311,6 @@ static void htable_put(struct ipt_hashlimit_htable *hinfo)
}
}
-
/* The algorithm used is the Simple Token Bucket Filter (TBF)
* see net/sched/sch_tbf.c in the linux source tree
*/
@@ -370,17 +354,82 @@ user2credits(u_int32_t user)
/* If multiplying would overflow... */
if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
/* Divide first. */
- return (user / IPT_HASHLIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
+ return (user / XT_HASHLIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
- return (user * HZ * CREDITS_PER_JIFFY) / IPT_HASHLIMIT_SCALE;
+ return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE;
}
static inline void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now)
{
- dh->rateinfo.credit += (now - xchg(&dh->rateinfo.prev, now))
- * CREDITS_PER_JIFFY;
+ dh->rateinfo.credit += (now - dh->rateinfo.prev) * CREDITS_PER_JIFFY;
if (dh->rateinfo.credit > dh->rateinfo.credit_cap)
dh->rateinfo.credit = dh->rateinfo.credit_cap;
+ 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;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ 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:
+ 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;
}
static int
@@ -393,68 +442,31 @@ hashlimit_match(const struct sk_buff *skb,
unsigned int protoff,
int *hotdrop)
{
- struct ipt_hashlimit_info *r =
- ((struct ipt_hashlimit_info *)matchinfo)->u.master;
- struct ipt_hashlimit_htable *hinfo = r->hinfo;
+ struct xt_hashlimit_info *r =
+ ((struct xt_hashlimit_info *)matchinfo)->u.master;
+ struct xt_hashlimit_htable *hinfo = r->hinfo;
unsigned long now = jiffies;
struct dsthash_ent *dh;
struct dsthash_dst dst;
- /* build 'dst' according to hinfo->cfg and current packet */
- memset(&dst, 0, sizeof(dst));
- if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_DIP)
- dst.dst_ip = skb->nh.iph->daddr;
- if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_SIP)
- dst.src_ip = skb->nh.iph->saddr;
- if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_DPT
- ||hinfo->cfg.mode & IPT_HASHLIMIT_HASH_SPT) {
- __be16 _ports[2], *ports;
-
- switch (skb->nh.iph->protocol) {
- case IPPROTO_TCP:
- case IPPROTO_UDP:
- case IPPROTO_SCTP:
- case IPPROTO_DCCP:
- ports = skb_header_pointer(skb, skb->nh.iph->ihl*4,
- sizeof(_ports), &_ports);
- break;
- default:
- _ports[0] = _ports[1] = 0;
- ports = _ports;
- break;
- }
- if (!ports) {
- /* We've been asked to examine this packet, and we
- can't. Hence, no choice but to drop. */
- *hotdrop = 1;
- return 0;
- }
- if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_SPT)
- dst.src_port = ports[0];
- if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_DPT)
- dst.dst_port = ports[1];
- }
+ if (hashlimit_init_dst(hinfo, &dst, skb, protoff) < 0)
+ goto hotdrop;
spin_lock_bh(&hinfo->lock);
- dh = __dsthash_find(hinfo, &dst);
+ dh = dsthash_find(hinfo, &dst);
if (!dh) {
- dh = __dsthash_alloc_init(hinfo, &dst);
-
+ dh = dsthash_alloc_init(hinfo, &dst);
if (!dh) {
- /* enomem... don't match == DROP */
- if (net_ratelimit())
- printk(KERN_ERR "%s: ENOMEM\n", __FUNCTION__);
spin_unlock_bh(&hinfo->lock);
- return 0;
+ 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);
- dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg *
- hinfo->cfg.burst);
+ dh->rateinfo.credit = user2credits(hinfo->cfg.avg *
+ hinfo->cfg.burst);
+ dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg *
+ hinfo->cfg.burst);
dh->rateinfo.cost = user2credits(hinfo->cfg.avg);
} else {
/* update expiration timeout */
@@ -473,6 +485,10 @@ hashlimit_match(const struct sk_buff *skb,
/* default case: we're overlimit, thus don't match */
return 0;
+
+hotdrop:
+ *hotdrop = 1;
+ return 0;
}
static int
@@ -482,42 +498,37 @@ hashlimit_checkentry(const char *tablename,
void *matchinfo,
unsigned int hook_mask)
{
- struct ipt_hashlimit_info *r = matchinfo;
+ struct xt_hashlimit_info *r = matchinfo;
/* Check for overflow. */
- if (r->cfg.burst == 0
- || user2credits(r->cfg.avg * r->cfg.burst) <
- user2credits(r->cfg.avg)) {
- printk(KERN_ERR "ipt_hashlimit: Overflow, try lower: %u/%u\n",
+ 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 0;
}
-
- if (r->cfg.mode == 0
- || r->cfg.mode > (IPT_HASHLIMIT_HASH_DPT
- |IPT_HASHLIMIT_HASH_DIP
- |IPT_HASHLIMIT_HASH_SIP
- |IPT_HASHLIMIT_HASH_SPT))
+ 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 0;
-
if (!r->cfg.gc_interval)
return 0;
-
if (!r->cfg.expire)
return 0;
-
if (r->name[sizeof(r->name) - 1] != '\0')
return 0;
/* This is the best we've got: We cannot release and re-grab lock,
- * since checkentry() is called before ip_tables.c grabs ipt_mutex.
- * We also cannot grab the hashtable spinlock, since htable_create will
+ * 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);
- if (!r->hinfo && (htable_create(r) != 0)) {
+ r->hinfo = htable_find_get(r->name, match->family);
+ if (!r->hinfo && htable_create(r, match->family) != 0) {
mutex_unlock(&hlimit_mutex);
return 0;
}
@@ -525,20 +536,19 @@ hashlimit_checkentry(const char *tablename,
/* Ugly hack: For SMP, we only want to use one set */
r->u.master = r;
-
return 1;
}
static void
hashlimit_destroy(const struct xt_match *match, void *matchinfo)
{
- struct ipt_hashlimit_info *r = matchinfo;
+ struct xt_hashlimit_info *r = matchinfo;
htable_put(r->hinfo);
}
#ifdef CONFIG_COMPAT
-struct compat_ipt_hashlimit_info {
+struct compat_xt_hashlimit_info {
char name[IFNAMSIZ];
struct hashlimit_cfg cfg;
compat_uptr_t hinfo;
@@ -547,40 +557,56 @@ struct compat_ipt_hashlimit_info {
static void compat_from_user(void *dst, void *src)
{
- int off = offsetof(struct compat_ipt_hashlimit_info, hinfo);
+ int off = offsetof(struct compat_xt_hashlimit_info, hinfo);
memcpy(dst, src, off);
- memset(dst + off, 0, sizeof(struct compat_ipt_hashlimit_info) - off);
+ memset(dst + off, 0, sizeof(struct compat_xt_hashlimit_info) - off);
}
static int compat_to_user(void __user *dst, void *src)
{
- int off = offsetof(struct compat_ipt_hashlimit_info, hinfo);
+ int off = offsetof(struct compat_xt_hashlimit_info, hinfo);
return copy_to_user(dst, src, off) ? -EFAULT : 0;
}
#endif
-static struct ipt_match ipt_hashlimit = {
- .name = "hashlimit",
- .match = hashlimit_match,
- .matchsize = sizeof(struct ipt_hashlimit_info),
+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),
#ifdef CONFIG_COMPAT
- .compatsize = sizeof(struct compat_ipt_hashlimit_info),
- .compat_from_user = compat_from_user,
- .compat_to_user = compat_to_user,
+ .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
+ .checkentry = hashlimit_checkentry,
+ .destroy = hashlimit_destroy,
+ .me = THIS_MODULE
+ },
};
/* PROC stuff */
-
static void *dl_seq_start(struct seq_file *s, loff_t *pos)
{
struct proc_dir_entry *pde = s->private;
- struct ipt_hashlimit_htable *htable = pde->data;
+ struct xt_hashlimit_htable *htable = pde->data;
unsigned int *bucket;
spin_lock_bh(&htable->lock);
@@ -598,7 +624,7 @@ static void *dl_seq_start(struct seq_file *s, loff_t *pos)
static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct proc_dir_entry *pde = s->private;
- struct ipt_hashlimit_htable *htable = pde->data;
+ struct xt_hashlimit_htable *htable = pde->data;
unsigned int *bucket = (unsigned int *)v;
*pos = ++(*bucket);
@@ -612,43 +638,59 @@ static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos)
static void dl_seq_stop(struct seq_file *s, void *v)
{
struct proc_dir_entry *pde = s->private;
- struct ipt_hashlimit_htable *htable = pde->data;
+ struct xt_hashlimit_htable *htable = pde->data;
unsigned int *bucket = (unsigned int *)v;
kfree(bucket);
-
spin_unlock_bh(&htable->lock);
}
-static inline int dl_seq_real_show(struct dsthash_ent *ent, struct seq_file *s)
+static int dl_seq_real_show(struct dsthash_ent *ent, int family,
+ struct seq_file *s)
{
/* recalculate to show accurate numbers */
rateinfo_recalc(ent, jiffies);
- 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.src_ip), ntohs(ent->dst.src_port),
- NIPQUAD(ent->dst.dst_ip), ntohs(ent->dst.dst_port),
- ent->rateinfo.credit, ent->rateinfo.credit_cap,
- ent->rateinfo.cost);
+ 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;
+ }
}
static int dl_seq_show(struct seq_file *s, void *v)
{
struct proc_dir_entry *pde = s->private;
- struct ipt_hashlimit_htable *htable = pde->data;
+ struct xt_hashlimit_htable *htable = pde->data;
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, s)) {
- /* buffer was filled and unable to print that tuple */
+ 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 0;
}
@@ -678,56 +720,53 @@ static struct file_operations dl_file_ops = {
.release = seq_release
};
-static int init_or_fini(int fini)
+static int __init xt_hashlimit_init(void)
{
- int ret = 0;
-
- if (fini)
- goto cleanup;
+ int err;
- if (ipt_register_match(&ipt_hashlimit)) {
- ret = -EINVAL;
- goto cleanup_nothing;
- }
+ err = xt_register_matches(xt_hashlimit, ARRAY_SIZE(xt_hashlimit));
+ if (err < 0)
+ goto err1;
- hashlimit_cachep = kmem_cache_create("ipt_hashlimit",
- sizeof(struct dsthash_ent), 0,
- 0, NULL, NULL);
+ err = -ENOMEM;
+ hashlimit_cachep = kmem_cache_create("xt_hashlimit",
+ sizeof(struct dsthash_ent), 0, 0,
+ NULL, NULL);
if (!hashlimit_cachep) {
- printk(KERN_ERR "Unable to create ipt_hashlimit slab cache\n");
- ret = -ENOMEM;
- goto cleanup_unreg_match;
+ printk(KERN_ERR "xt_hashlimit: unable to create slab cache\n");
+ goto err2;
}
-
- hashlimit_procdir = proc_mkdir("ipt_hashlimit", proc_net);
- if (!hashlimit_procdir) {
- printk(KERN_ERR "Unable to create proc dir entry\n");
- ret = -ENOMEM;
- goto cleanup_free_slab;
+ 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;
}
-
- return ret;
-
-cleanup:
+ hashlimit_procdir6 = proc_mkdir("ip6t_hashlimit", proc_net);
+ if (!hashlimit_procdir6) {
+ printk(KERN_ERR "xt_hashlimit: tnable to create proc dir "
+ "entry\n");
+ goto err4;
+ }
+ return 0;
+err4:
remove_proc_entry("ipt_hashlimit", proc_net);
-cleanup_free_slab:
+err3:
kmem_cache_destroy(hashlimit_cachep);
-cleanup_unreg_match:
- ipt_unregister_match(&ipt_hashlimit);
-cleanup_nothing:
- return ret;
-
-}
+err2:
+ xt_unregister_matches(xt_hashlimit, ARRAY_SIZE(xt_hashlimit));
+err1:
+ return err;
-static int __init ipt_hashlimit_init(void)
-{
- return init_or_fini(0);
}
-static void __exit ipt_hashlimit_fini(void)
+static void __exit xt_hashlimit_fini(void)
{
- init_or_fini(1);
+ 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));
}
-module_init(ipt_hashlimit_init);
-module_exit(ipt_hashlimit_fini);
+module_init(xt_hashlimit_init);
+module_exit(xt_hashlimit_fini);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-03 00:06:55 +0000