mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
492 lines
12 KiB
C
492 lines
12 KiB
C
/* 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);
|
|
}
|
|
|
|
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);
|
|
} else
|
|
ip_to = ip;
|
|
|
|
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 inline void
|
|
hash_ip6_data_zero_out(struct hash_ip6_elem *elem)
|
|
{
|
|
ipv6_addr_set(&elem->ip.in6, 0, 0, 0, 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 bool
|
|
hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *data)
|
|
{
|
|
if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6))
|
|
goto nla_put_failure;
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return 1;
|
|
}
|
|
|
|
static bool
|
|
hash_ip6_data_tlist(struct sk_buff *skb, const struct hash_ip6_elem *data)
|
|
{
|
|
const struct hash_ip6_telem *e =
|
|
(const struct hash_ip6_telem *)data;
|
|
|
|
if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
|
|
nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
|
|
htonl(ip_set_timeout_get(e->timeout))))
|
|
goto nla_put_failure;
|
|
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 inline void
|
|
hash_ip6_data_next(struct ip_set_hash *h, const struct hash_ip6_elem *d)
|
|
{
|
|
}
|
|
|
|
static int
|
|
hash_ip6_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];
|
|
union nf_inet_addr ip;
|
|
|
|
ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip.in6);
|
|
ip6_netmask(&ip, h->netmask);
|
|
if (ipv6_addr_any(&ip.in6))
|
|
return -EINVAL;
|
|
|
|
return adtfn(set, &ip, opt_timeout(opt, h), opt->cmdflags);
|
|
}
|
|
|
|
static const struct nla_policy hash_ip6_adt_policy[IPSET_ATTR_ADT_MAX + 1] = {
|
|
[IPSET_ATTR_IP] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int
|
|
hash_ip6_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];
|
|
union nf_inet_addr ip;
|
|
u32 timeout = h->timeout;
|
|
int ret;
|
|
|
|
if (unlikely(!tb[IPSET_ATTR_IP] ||
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
|
|
tb[IPSET_ATTR_IP_TO] ||
|
|
tb[IPSET_ATTR_CIDR]))
|
|
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], &ip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ip6_netmask(&ip, h->netmask);
|
|
if (ipv6_addr_any(&ip.in6))
|
|
return -IPSET_ERR_HASH_ELEM;
|
|
|
|
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, &ip, timeout, flags);
|
|
|
|
return ip_set_eexist(ret, flags) ? 0 : ret;
|
|
}
|
|
|
|
/* Create hash:ip type of sets */
|
|
|
|
static int
|
|
hash_ip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
|
|
{
|
|
u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
|
|
u8 netmask, hbits;
|
|
size_t hsize;
|
|
struct ip_set_hash *h;
|
|
|
|
if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
|
|
return -IPSET_ERR_INVALID_FAMILY;
|
|
netmask = set->family == NFPROTO_IPV4 ? 32 : 128;
|
|
pr_debug("Create set %s with family %s\n",
|
|
set->name, set->family == NFPROTO_IPV4 ? "inet" : "inet6");
|
|
|
|
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]);
|
|
|
|
if (tb[IPSET_ATTR_NETMASK]) {
|
|
netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
|
|
|
|
if ((set->family == NFPROTO_IPV4 && netmask > 32) ||
|
|
(set->family == NFPROTO_IPV6 && netmask > 128) ||
|
|
netmask == 0)
|
|
return -IPSET_ERR_INVALID_NETMASK;
|
|
}
|
|
|
|
h = kzalloc(sizeof(*h), GFP_KERNEL);
|
|
if (!h)
|
|
return -ENOMEM;
|
|
|
|
h->maxelem = maxelem;
|
|
h->netmask = netmask;
|
|
get_random_bytes(&h->initval, sizeof(h->initval));
|
|
h->timeout = IPSET_NO_TIMEOUT;
|
|
|
|
hbits = htable_bits(hashsize);
|
|
hsize = htable_size(hbits);
|
|
if (hsize == 0) {
|
|
kfree(h);
|
|
return -ENOMEM;
|
|
}
|
|
h->table = ip_set_alloc(hsize);
|
|
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 == NFPROTO_IPV4
|
|
? &hash_ip4_tvariant : &hash_ip6_tvariant;
|
|
|
|
if (set->family == NFPROTO_IPV4)
|
|
hash_ip4_gc_init(set);
|
|
else
|
|
hash_ip6_gc_init(set);
|
|
} else {
|
|
set->variant = set->family == NFPROTO_IPV4
|
|
? &hash_ip4_variant : &hash_ip6_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_ip_type __read_mostly = {
|
|
.name = "hash:ip",
|
|
.protocol = IPSET_PROTOCOL,
|
|
.features = IPSET_TYPE_IP,
|
|
.dimension = IPSET_DIM_ONE,
|
|
.family = NFPROTO_UNSPEC,
|
|
.revision_min = REVISION_MIN,
|
|
.revision_max = REVISION_MAX,
|
|
.create = hash_ip_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 },
|
|
[IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
|
|
},
|
|
.adt_policy = {
|
|
[IPSET_ATTR_IP] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_CIDR] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
},
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init
|
|
hash_ip_init(void)
|
|
{
|
|
return ip_set_type_register(&hash_ip_type);
|
|
}
|
|
|
|
static void __exit
|
|
hash_ip_fini(void)
|
|
{
|
|
ip_set_type_unregister(&hash_ip_type);
|
|
}
|
|
|
|
module_init(hash_ip_init);
|
|
module_exit(hash_ip_fini);
|