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/* 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:ip type */
#include <linux/jhash.h>
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/netlink.h>
#include <net/tcp.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>
#define REVISION_MIN 0
#define REVISION_MAX 0
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
IP_SET_MODULE_DESC("hash:ip", REVISION_MIN, REVISION_MAX);
MODULE_ALIAS("ip_set_hash:ip");
/* Type specific function prefix */
#define TYPE hash_ip
static bool
hash_ip_same_set(const struct ip_set *a, const struct ip_set *b);
#define hash_ip4_same_set hash_ip_same_set
#define hash_ip6_same_set hash_ip_same_set
/* The type variant functions: IPv4 */
/* Member elements without timeout */
struct hash_ip4_elem {
__be32 ip;
};
/* Member elements with timeout support */
struct hash_ip4_telem {
__be32 ip;
unsigned long timeout;
};
static inline bool
hash_ip4_data_equal(const struct hash_ip4_elem *ip1,
const struct hash_ip4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip;
}
static inline bool
hash_ip4_data_isnull(const struct hash_ip4_elem *elem)
{
return elem->ip == 0;
}
static inline void
hash_ip4_data_copy(struct hash_ip4_elem *dst, const struct hash_ip4_elem *src)
{
dst->ip = src->ip;
}
/* Zero valued IP addresses cannot be stored */
static inline void
hash_ip4_data_zero_out(struct hash_ip4_elem *elem)
{
elem->ip = 0;
}
static inline bool
hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *data)
{
if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip))
goto nla_put_failure;
return 0;
nla_put_failure:
return 1;
}
static bool
hash_ip4_data_tlist(struct sk_buff *skb, const struct hash_ip4_elem *data)
{
const struct hash_ip4_telem *tdata =
(const struct hash_ip4_telem *)data;
if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, tdata->ip) ||
nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
htonl(ip_set_timeout_get(tdata->timeout))))
goto nla_put_failure;
return 0;
nla_put_failure:
return 1;
}
#define IP_SET_HASH_WITH_NETMASK
#define PF 4
#define HOST_MASK 32
#include <linux/netfilter/ipset/ip_set_ahash.h>
static inline void
hash_ip4_data_next(struct ip_set_hash *h, const struct hash_ip4_elem *d)
{
h->next.ip = d->ip;
}
static int
hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
const struct xt_action_param *par,
enum ipset_adt adt, const struct ip_set_adt_opt *opt)
{
const struct ip_set_hash *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
__be32 ip;
ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
ip &= ip_set_netmask(h->netmask);
if (ip == 0)
return -EINVAL;
return adtfn(set, &ip, opt_timeout(opt, h), opt->cmdflags);
}
static int
hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
const struct ip_set_hash *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
u32 ip, ip_to, hosts, timeout = h->timeout;
__be32 nip;
int ret = 0;
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_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
if (ret)
return ret;
ip &= ip_set_hostmask(h->netmask);
if (tb[IPSET_ATTR_TIMEOUT]) {
if (!with_timeout(h->timeout))
return -IPSET_ERR_TIMEOUT;
timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
}
if (adt == IPSET_TEST) {
nip = htonl(ip);
if (nip == 0)
return -IPSET_ERR_HASH_ELEM;
return adtfn(set, &nip, timeout, flags);
}
ip_to = ip;
if (tb[IPSET_ATTR_IP_TO]) {
ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
if (ret)
return ret;
if (ip > ip_to)
swap(ip, ip_to);
} else if (tb[IPSET_ATTR_CIDR]) {
u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
if (!cidr || cidr > 32)
return -IPSET_ERR_INVALID_CIDR;
ip_set_mask_from_to(ip, ip_to, cidr);
}
hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
if (retried)
ip = ntohl(h->next.ip);
for (; !before(ip_to, ip); ip += hosts) {
nip = htonl(ip);
if (nip == 0)
return -IPSET_ERR_HASH_ELEM;
ret = adtfn(set, &nip, timeout, flags);
if (ret && !ip_set_eexist(ret, flags))
return ret;
else
ret = 0;
}
return ret;
}
static bool
hash_ip_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 &&
x->netmask == y->netmask;
}
/* The type variant functions: IPv6 */
struct hash_ip6_elem {
union nf_inet_addr ip;
};
struct hash_ip6_telem {
union nf_inet_addr ip;
unsigned long timeout;
};
static inline bool
hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
const struct hash_ip6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0;
}
static inline bool
hash_ip6_data_isnull(const struct hash_ip6_elem *elem)
{
return ipv6_addr_any(&elem->ip.in6);
}
static inline void
hash_ip6_data_copy(struct hash_ip6_elem *dst, const struct hash_ip6_elem *src)
{
dst->ip.in6 = src->ip.in6;
}
static <
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