提交 b3837029 编写于 作者: J Jozsef Kadlecsik 提交者: Patrick McHardy

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: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>
上级 41d22f7b
......@@ -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
......@@ -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
/* 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);
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