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Commit b3837029 authored by Jozsef Kadlecsik's avatar Jozsef Kadlecsik Committed by Patrick McHardy
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netfilter: ipset: hash:net set type support 



The module implements the hash:net type support in four flavours:
for IPv4 and IPv6, both without and with timeout support. The elements
are one dimensional: IPv4/IPv6 network address/prefixes.

Signed-off-by: default avatarJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
parent 41d22f7b

net/netfilter/ipset/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -89,4 +89,13 @@ config IP_SET_HASH_IPPORTNET 


	  To compile it as a module, choose M here.  If unsure, say N.



config IP_SET_HASH_NET

	tristate "hash:net set support"

	depends on IP_SET

	help

	  This option adds the hash:net set type support, by which

	  one can store IPv4/IPv6 network address/prefix elements in a set.



	  To compile it as a module, choose M here.  If unsure, say N.



endif # IP_SET

net/netfilter/ipset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,3 +17,4 @@ obj-$(CONFIG_IP_SET_HASH_IP) += ip_set_hash_ip.o 
obj-$(CONFIG_IP_SET_HASH_IPPORT) += ip_set_hash_ipport.o

obj-$(CONFIG_IP_SET_HASH_IPPORTIP) += ip_set_hash_ipportip.o

obj-$(CONFIG_IP_SET_HASH_IPPORTNET) += ip_set_hash_ipportnet.o

obj-$(CONFIG_IP_SET_HASH_NET) += ip_set_hash_net.o

net/netfilter/ipset/ip_set_hash_net.c

0 → 100644
+461 −0
Original line number Diff line number Diff line 
/* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



/* Kernel module implementing an IP set type: the hash:net type */



#include <linux/jhash.h>

#include <linux/module.h>

#include <linux/ip.h>

#include <linux/skbuff.h>

#include <linux/errno.h>

#include <linux/uaccess.h>

#include <linux/bitops.h>

#include <linux/spinlock.h>

#include <linux/random.h>

#include <net/ip.h>

#include <net/ipv6.h>

#include <net/netlink.h>



#include <linux/netfilter.h>

#include <linux/netfilter/ipset/pfxlen.h>

#include <linux/netfilter/ipset/ip_set.h>

#include <linux/netfilter/ipset/ip_set_timeout.h>

#include <linux/netfilter/ipset/ip_set_hash.h>



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");

MODULE_DESCRIPTION("hash:net type of IP sets");

MODULE_ALIAS("ip_set_hash:net");



/* Type specific function prefix */

#define TYPE		hash_net



static bool

hash_net_same_set(const struct ip_set *a, const struct ip_set *b);



#define hash_net4_same_set	hash_net_same_set

#define hash_net6_same_set	hash_net_same_set



/* The type variant functions: IPv4 */



/* Member elements without timeout */

struct hash_net4_elem {

	__be32 ip;

	u16 padding0;

	u8 padding1;

	u8 cidr;

};



/* Member elements with timeout support */

struct hash_net4_telem {

	__be32 ip;

	u16 padding0;

	u8 padding1;

	u8 cidr;

	unsigned long timeout;

};



static inline bool

hash_net4_data_equal(const struct hash_net4_elem *ip1,

		    const struct hash_net4_elem *ip2)

{

	return ip1->ip == ip2->ip && ip1->cidr == ip2->cidr;

}



static inline bool

hash_net4_data_isnull(const struct hash_net4_elem *elem)

{

	return elem->cidr == 0;

}



static inline void

hash_net4_data_copy(struct hash_net4_elem *dst,

		    const struct hash_net4_elem *src)

{

	dst->ip = src->ip;

	dst->cidr = src->cidr;

}



static inline void

hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)

{

	elem->ip &= ip_set_netmask(cidr);

	elem->cidr = cidr;

}



/* Zero CIDR values cannot be stored */

static inline void

hash_net4_data_zero_out(struct hash_net4_elem *elem)

{

	elem->cidr = 0;

}



static bool

hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)

{

	NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, data->ip);

	NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);

	return 0;



nla_put_failure:

	return 1;

}



static bool

hash_net4_data_tlist(struct sk_buff *skb, const struct hash_net4_elem *data)

{

	const struct hash_net4_telem *tdata =

		(const struct hash_net4_telem *)data;



	NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, tdata->ip);

	NLA_PUT_U8(skb, IPSET_ATTR_CIDR, tdata->cidr);

	NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,

		      htonl(ip_set_timeout_get(tdata->timeout)));



	return 0;



nla_put_failure:

	return 1;

}



#define IP_SET_HASH_WITH_NETS



#define PF		4

#define HOST_MASK	32

#include <linux/netfilter/ipset/ip_set_ahash.h>



static int

hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,

	       enum ipset_adt adt, u8 pf, u8 dim, u8 flags)

{

	const struct ip_set_hash *h = set->data;

	ipset_adtfn adtfn = set->variant->adt[adt];

	struct hash_net4_elem data = { .cidr = h->nets[0].cidr || HOST_MASK };



	if (data.cidr == 0)

		return -EINVAL;

	if (adt == IPSET_TEST)

		data.cidr = HOST_MASK;



	ip4addrptr(skb, flags & IPSET_DIM_ONE_SRC, &data.ip);

	data.ip &= ip_set_netmask(data.cidr);



	return adtfn(set, &data, h->timeout);

}



static int

hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],

	       enum ipset_adt adt, u32 *lineno, u32 flags)

{

	const struct ip_set_hash *h = set->data;

	ipset_adtfn adtfn = set->variant->adt[adt];

	struct hash_net4_elem data = { .cidr = HOST_MASK };

	u32 timeout = h->timeout;

	int ret;



	if (unlikely(!tb[IPSET_ATTR_IP] ||

		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))

		return -IPSET_ERR_PROTOCOL;



	if (tb[IPSET_ATTR_LINENO])

		*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);



	ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &data.ip);

	if (ret)

		return ret;



	if (tb[IPSET_ATTR_CIDR])

		data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);



	if (!data.cidr)

		return -IPSET_ERR_INVALID_CIDR;



	data.ip &= ip_set_netmask(data.cidr);



	if (tb[IPSET_ATTR_TIMEOUT]) {

		if (!with_timeout(h->timeout))

			return -IPSET_ERR_TIMEOUT;

		timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);

	}



	ret = adtfn(set, &data, timeout);



	return ip_set_eexist(ret, flags) ? 0 : ret;

}



static bool

hash_net_same_set(const struct ip_set *a, const struct ip_set *b)

{

	const struct ip_set_hash *x = a->data;

	const struct ip_set_hash *y = b->data;



	/* Resizing changes htable_bits, so we ignore it */

	return x->maxelem == y->maxelem &&

	       x->timeout == y->timeout;

}



/* The type variant functions: IPv6 */



struct hash_net6_elem {

	union nf_inet_addr ip;

	u16 padding0;

	u8 padding1;

	u8 cidr;

};



struct hash_net6_telem {

	union nf_inet_addr ip;

	u16 padding0;

	u8 padding1;

	u8 cidr;

	unsigned long timeout;

};



static inline bool

hash_net6_data_equal(const struct hash_net6_elem *ip1,

		     const struct hash_net6_elem *ip2)

{

	return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&

	       ip1->cidr == ip2->cidr;

}



static inline bool

hash_net6_data_isnull(const struct hash_net6_elem *elem)

{

	return elem->cidr == 0;

}



static inline void

hash_net6_data_copy(struct hash_net6_elem *dst,

		    const struct hash_net6_elem *src)

{

	ipv6_addr_copy(&dst->ip.in6, &src->ip.in6);

	dst->cidr = src->cidr;

}



static inline void

hash_net6_data_zero_out(struct hash_net6_elem *elem)

{

	elem->cidr = 0;

}



static inline void

ip6_netmask(union nf_inet_addr *ip, u8 prefix)

{

	ip->ip6[0] &= ip_set_netmask6(prefix)[0];

	ip->ip6[1] &= ip_set_netmask6(prefix)[1];

	ip->ip6[2] &= ip_set_netmask6(prefix)[2];

	ip->ip6[3] &= ip_set_netmask6(prefix)[3];

}



static inline void

hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)

{

	ip6_netmask(&elem->ip, cidr);

	elem->cidr = cidr;

}



static bool

hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)

{

	NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &data->ip);

	NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);

	return 0;



nla_put_failure:

	return 1;

}



static bool

hash_net6_data_tlist(struct sk_buff *skb, const struct hash_net6_elem *data)

{

	const struct hash_net6_telem *e =

		(const struct hash_net6_telem *)data;



	NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &e->ip);

	NLA_PUT_U8(skb, IPSET_ATTR_CIDR, e->cidr);

	NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,

		      htonl(ip_set_timeout_get(e->timeout)));

	return 0;



nla_put_failure:

	return 1;

}



#undef PF

#undef HOST_MASK



#define PF		6

#define HOST_MASK	128

#include <linux/netfilter/ipset/ip_set_ahash.h>



static int

hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,

	       enum ipset_adt adt, u8 pf, u8 dim, u8 flags)

{

	const struct ip_set_hash *h = set->data;

	ipset_adtfn adtfn = set->variant->adt[adt];

	struct hash_net6_elem data = { .cidr = h->nets[0].cidr || HOST_MASK };



	if (data.cidr == 0)

		return -EINVAL;

	if (adt == IPSET_TEST)

		data.cidr = HOST_MASK;



	ip6addrptr(skb, flags & IPSET_DIM_ONE_SRC, &data.ip.in6);

	ip6_netmask(&data.ip, data.cidr);



	return adtfn(set, &data, h->timeout);

}



static int

hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],

	       enum ipset_adt adt, u32 *lineno, u32 flags)

{

	const struct ip_set_hash *h = set->data;

	ipset_adtfn adtfn = set->variant->adt[adt];

	struct hash_net6_elem data = { .cidr = HOST_MASK };

	u32 timeout = h->timeout;

	int ret;



	if (unlikely(!tb[IPSET_ATTR_IP] ||

		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))

		return -IPSET_ERR_PROTOCOL;



	if (tb[IPSET_ATTR_LINENO])

		*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);



	ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &data.ip);

	if (ret)

		return ret;



	if (tb[IPSET_ATTR_CIDR])

		data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);



	if (!data.cidr)

		return -IPSET_ERR_INVALID_CIDR;



	ip6_netmask(&data.ip, data.cidr);



	if (tb[IPSET_ATTR_TIMEOUT]) {

		if (!with_timeout(h->timeout))

			return -IPSET_ERR_TIMEOUT;

		timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);

	}



	ret = adtfn(set, &data, timeout);



	return ip_set_eexist(ret, flags) ? 0 : ret;

}



/* Create hash:ip type of sets */



static int

hash_net_create(struct ip_set *set, struct nlattr *tb[], u32 flags)

{

	u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;

	struct ip_set_hash *h;

	u8 hbits;



	if (!(set->family == AF_INET || set->family == AF_INET6))

		return -IPSET_ERR_INVALID_FAMILY;



	if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||

		     !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||

		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))

		return -IPSET_ERR_PROTOCOL;



	if (tb[IPSET_ATTR_HASHSIZE]) {

		hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);

		if (hashsize < IPSET_MIMINAL_HASHSIZE)

			hashsize = IPSET_MIMINAL_HASHSIZE;

	}



	if (tb[IPSET_ATTR_MAXELEM])

		maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);



	h = kzalloc(sizeof(*h)

		    + sizeof(struct ip_set_hash_nets)

		      * (set->family == AF_INET ? 32 : 128), GFP_KERNEL);

	if (!h)

		return -ENOMEM;



	h->maxelem = maxelem;

	get_random_bytes(&h->initval, sizeof(h->initval));

	h->timeout = IPSET_NO_TIMEOUT;



	hbits = htable_bits(hashsize);

	h->table = ip_set_alloc(

			sizeof(struct htable)

			+ jhash_size(hbits) * sizeof(struct hbucket));

	if (!h->table) {

		kfree(h);

		return -ENOMEM;

	}

	h->table->htable_bits = hbits;



	set->data = h;



	if (tb[IPSET_ATTR_TIMEOUT]) {

		h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);



		set->variant = set->family == AF_INET

			? &hash_net4_tvariant : &hash_net6_tvariant;



		if (set->family == AF_INET)

			hash_net4_gc_init(set);

		else

			hash_net6_gc_init(set);

	} else {

		set->variant = set->family == AF_INET

			? &hash_net4_variant : &hash_net6_variant;

	}



	pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",

		 set->name, jhash_size(h->table->htable_bits),

		 h->table->htable_bits, h->maxelem, set->data, h->table);



	return 0;

}



static struct ip_set_type hash_net_type __read_mostly = {

	.name		= "hash:net",

	.protocol	= IPSET_PROTOCOL,

	.features	= IPSET_TYPE_IP,

	.dimension	= IPSET_DIM_ONE,

	.family		= AF_UNSPEC,

	.revision	= 0,

	.create		= hash_net_create,

	.create_policy	= {

		[IPSET_ATTR_HASHSIZE]	= { .type = NLA_U32 },

		[IPSET_ATTR_MAXELEM]	= { .type = NLA_U32 },

		[IPSET_ATTR_PROBES]	= { .type = NLA_U8 },

		[IPSET_ATTR_RESIZE]	= { .type = NLA_U8  },

		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },

	},

	.adt_policy	= {

		[IPSET_ATTR_IP]		= { .type = NLA_NESTED },

		[IPSET_ATTR_CIDR]	= { .type = NLA_U8 },

		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },

	},

	.me		= THIS_MODULE,

};



static int __init

hash_net_init(void)

{

	return ip_set_type_register(&hash_net_type);

}



static void __exit

hash_net_fini(void)

{

	ip_set_type_unregister(&hash_net_type);

}



module_init(hash_net_init);

module_exit(hash_net_fini);