/* Copyright (C) 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,iface 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 <linux/rbtree.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,iface type of IP sets");
MODULE_ALIAS("ip_set_hash:net,iface");
/* Interface name rbtree */
struct iface_node {
struct rb_node node;
char iface[IFNAMSIZ];
};
#define iface_data(n) (rb_entry(n, struct iface_node, node)->iface)
static inline long
ifname_compare(const char *_a, const char *_b)
{
const long *a = (const long *)_a;
const long *b = (const long *)_b;
BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
if (a[0] != b[0])
return a[0] - b[0];
if (IFNAMSIZ > sizeof(long)) {
if (a[1] != b[1])
return a[1] - b[1];
}
if (IFNAMSIZ > 2 * sizeof(long)) {
if (a[2] != b[2])
return a[2] - b[2];
}
if (IFNAMSIZ > 3 * sizeof(long)) {
if (a[3] != b[3])
return a[3] - b[3];
}
return 0;
}
static void
rbtree_destroy(struct rb_root *root)
{
struct rb_node *p, *n = root->rb_node;
struct iface_node *node;
/* Non-recursive destroy, like in ext3 */
while (n) {
if (n->rb_left) {
n = n->rb_left;
continue;
}
if (n->rb_right) {
n = n->rb_right;
continue;
}
p = rb_parent(n);
node = rb_entry(n, struct iface_node, node);
if (!p)
*root = RB_ROOT;
else if (p->rb_left == n)
p->rb_left = NULL;
else if (p->rb_right == n)
p->rb_right = NULL;
kfree(node);
n = p;
}
}
static int
iface_test(struct rb_root *root, const char **iface)
{
struct rb_node *n = root->rb_node;
while (n) {
const char *d = iface_data(n);
long res = ifname_compare(*iface, d);
if (res < 0)
n = n->rb_left;
else if (res > 0)
n = n->rb_right;
else {
*iface = d;
return 1;
}
}
return 0;
}
static int
iface_add(struct rb_root *root, const char **iface)
{
struct rb_node **n = &(root->rb_node), *p = NULL;
struct iface_node *d;
while (*n) {
char *ifname = iface_data(*n);
long res = ifname_compare(*iface, ifname);
p = *n;
if (res < 0)
n = &((*n)->rb_left);
else if (res > 0)
n = &((*n)->rb_right);
else {
*iface = ifname;
return 0;
}
}
d = kzalloc(sizeof(*d), GFP_ATOMIC);
if (!d)
return -ENOMEM;
strcpy(d->iface, *iface);
rb_link_node(&d->node, p, n);
rb_insert_color(&d->node, root);
*iface = d->iface;
return 0;
}
/* Type specific function prefix */
#define TYPE hash_netiface
static bool
hash_netiface_same_set(const struct ip_set *a, const struct ip_set *b);
#define hash_netiface4_same_set hash_netiface_same_set
#define hash_netiface6_same_set hash_netiface_same_set
#define STREQ(a, b) (strcmp(a, b) == 0)
/* The type variant functions: IPv4 */
struct hash_netiface4_elem_hashed {
__be32 ip;
u8 physdev;
u8 cidr;
u16 padding;
};
#define HKEY_DATALEN sizeof(struct hash_netiface4_elem_hashed)
/* Member elements without timeout */
struct hash_netiface4_elem {
__be32 ip;
u8 physdev;
u8 cidr;
u16 padding;
const char *iface;
};
/* Member elements with timeout support */
struct hash_netiface4_telem {
__be32 ip;
u8 physdev;
u8 cidr;
u16 padding;
const char *iface;
unsigned long timeout;
};
static inline bool
hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1,
const struct hash_netiface4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip &&
ip1->cidr == ip2->cidr &&
(++*multi) &&
ip1->physdev == ip2->physdev &&
ip1->iface == ip2->iface;
}
static inline bool
hash_netiface4_data_isnull(const struct hash_netiface4_elem *elem)
{
return elem->cidr == 0;
}
static inline void
hash_netiface4_data_copy(struct hash_netiface4_elem *dst,
const struct hash_netiface4_elem *src) {
dst->ip = src->ip;
dst->cidr = src->cidr;
dst->physdev = src->physdev;
dst->iface = src->iface;
}
static inline void
hash_netiface4_data_netmask(struct hash_netiface4_elem *elem, u8 cidr)
{
elem->ip &= ip_set_netmask(cidr);
elem->cidr = cidr;
}
static inline void
hash_netiface4_data_zero_out(struct hash_netiface4_elem *elem)
{
elem->cidr = 0;
}
static bool
hash_netiface4_data_list(struct sk_buff *skb,
const struct hash_netiface4_elem *data)
{
u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;
NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, data->ip);
NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
NLA_PUT_STRING(skb, IPSET_ATTR_IFACE, data->iface);
if (flags)
NLA_PUT_NET32(skb, IPSET_ATTR_CADT_FLAGS, flags);
return 0;
nla_put_failure:
return 1;
}
static bool
hash_netiface4_data_tlist(struct sk_buff *skb,
const struct hash_netiface4_elem *data)
{
const struct hash_netiface4_telem *tdata =
(const struct hash_netiface4_telem *)data;
u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;
NLA_PUT_IPADDR4(skb, IPSET_ATTR_IP, data->ip);
NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
NLA_PUT_STRING(skb, IPSET_ATTR_IFACE, data->iface);
if (flags)
NLA_PUT_NET32(skb, IPSET_ATTR_CADT_FLAGS, flags);
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 IP_SET_HASH_WITH_RBTREE
#define IP_SET_HASH_WITH_MULTI
#define PF 4
#define HOST_MASK 32
#include <linux/netfilter/ipset/ip_set_ahash.h>
static inline void
hash_netiface4_data_next(struct ip_set_hash *h,
const struct hash_netiface4_elem *d)
{
h->next.ip = ntohl(d->ip);
}
static int
hash_netiface4_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)
{
struct ip_set_hash *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netiface4_elem data = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK
};
int ret;
if (data.cidr == 0)
return -EINVAL;
if (adt == IPSET_TEST)
data.cidr = HOST_MASK;
ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip);
data.ip &= ip_set_netmask(data.cidr);
#define IFACE(dir) (par->dir ? par->dir->name : NULL)
#define PHYSDEV(dir) (nf_bridge->dir ? nf_bridge->dir->name : NULL)
#define SRCDIR (opt->flags & IPSET_DIM_TWO_SRC)
if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
#ifdef CONFIG_BRIDGE_NETFILTER
const struct nf_bridge_info *nf_bridge = skb->nf_bridge;
if (!nf_bridge)
return -EINVAL;
data.iface = SRCDIR ? PHYSDEV(physindev) : PHYSDEV(physoutdev);
data.physdev = 1;
#else
data.iface = NULL;
#endif
} else
data.iface = SRCDIR ? IFACE(in) : IFACE(out);
if (!data.iface)
return -EINVAL;
ret = iface_test(&h->rbtree, &data.iface);
if (adt == IPSET_ADD) {
if (!ret) {
ret = iface_add(&h->rbtree, &data.iface);
if (ret)
return ret;
}
} else if (!ret)
return ret;
return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
}
static int
hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
struct ip_set_hash *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netiface4_elem data = { .cidr = HOST_MASK };
u32 ip = 0, ip_to, last;
u32 timeout = h->timeout;
char iface[IFNAMSIZ] = {};
int ret;
if (unlikely(!tb[IPSET_ATTR_IP] ||
!tb[IPSET_ATTR_IFACE] ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
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;
if (tb[IPSET_ATTR_CIDR]) {
data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
if (!data.cidr)
return -IPSET_ERR_INVALID_CIDR;
}
if (tb[IPSET_ATTR_TIMEOUT]) {
if (!with_timeout(h->timeout))
return -IPSET_ERR_TIMEOUT;
timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
}
strcpy(iface, nla_data(tb[IPSET_ATTR_IFACE]));
data.iface = iface;
ret = iface_test(&h->rbtree, &data.iface);
if (adt == IPSET_ADD) {
if (!ret) {
ret = iface_add(&h->rbtree, &data.iface);
if (ret)
return ret;
}
} else if (!ret)
return ret;
if (tb[IPSET_ATTR_CADT_FLAGS]) {
u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
if (cadt_flags & IPSET_FLAG_PHYSDEV)
data.physdev = 1;
}
if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
data.ip = htonl(ip & ip_set_hostmask(data.cidr));
ret = adtfn(set, &data, timeout, flags);
return ip_set_eexist(ret, flags) ? 0 : ret;
}
if (tb[IPSET_ATTR_IP_TO]) {
ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
if (ret)
return ret;
if (ip_to < ip)
swap(ip, ip_to);
if (ip + UINT_MAX == ip_to)
return -IPSET_ERR_HASH_RANGE;
} else {
ip_set_mask_from_to(ip, ip_to, data.cidr);
}
if (retried)
ip = h->next.ip;
while (!after(ip, ip_to)) {
data.ip = htonl(ip);
last = ip_set_range_to_cidr(ip, ip_to, &data.cidr);
ret = adtfn(set, &data, timeout, flags);
if (ret && !ip_set_eexist(ret, flags))
return ret;
else
ret = 0;
ip = last + 1;
}
return ret;
}
static bool
hash_netiface_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_netiface6_elem_hashed {
union nf_inet_addr ip;
u8 physdev;
u8 cidr;
u16 padding;
};
#define HKEY_DATALEN sizeof(struct hash_netiface6_elem_hashed)
struct hash_netiface6_elem {
union nf_inet_addr ip;
u8 physdev;
u8 cidr;
u16 padding;
const char *iface;
};
struct hash_netiface6_telem {
union nf_inet_addr ip;
u8 physdev;
u8 cidr;
u16 padding;
const char *iface;
unsigned long timeout;
};
static inline bool
hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
const struct hash_netiface6_elem *ip2,
u32 *multi)
{
return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
ip1->cidr == ip2->cidr &&
(++*multi) &&
ip1->physdev == ip2->physdev &&
ip1->iface == ip2->iface;
}
static inline bool
hash_netiface6_data_isnull(const struct hash_netiface6_elem *elem)
{
return elem->cidr == 0;
}
static inline void
hash_netiface6_data_copy(struct hash_netiface6_elem *dst,
const struct hash_netiface6_elem *src)
{
memcpy(dst, src, sizeof(*dst));
}
static inline void
hash_netiface6_data_zero_out(struct hash_netiface6_elem *elem)
{
}
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_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr)
{
ip6_netmask(&elem->ip, cidr);
elem->cidr = cidr;
}
static bool
hash_netiface6_data_list(struct sk_buff *skb,
const struct hash_netiface6_elem *data)
{
u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;
NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &data->ip);
NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
NLA_PUT_STRING(skb, IPSET_ATTR_IFACE, data->iface);
if (flags)
NLA_PUT_NET32(skb, IPSET_ATTR_CADT_FLAGS, flags);
return 0;
nla_put_failure:
return 1;
}
static bool
hash_netiface6_data_tlist(struct sk_buff *skb,
const struct hash_netiface6_elem *data)
{
const struct hash_netiface6_telem *e =
(const struct hash_netiface6_telem *)data;
u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;
NLA_PUT_IPADDR6(skb, IPSET_ATTR_IP, &e->ip);
NLA_PUT_U8(skb, IPSET_ATTR_CIDR, data->cidr);
NLA_PUT_STRING(skb, IPSET_ATTR_IFACE, data->iface);
if (flags)
NLA_PUT_NET32(skb, IPSET_ATTR_CADT_FLAGS, flags);
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 inline void
hash_netiface6_data_next(struct ip_set_hash *h,
const struct hash_netiface6_elem *d)
{
}
static int
hash_netiface6_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)
{
struct ip_set_hash *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netiface6_elem data = {
.cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK
};
int ret;
if (data.cidr == 0)
return -EINVAL;
if (adt == IPSET_TEST)
data.cidr = HOST_MASK;
ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
ip6_netmask(&data.ip, data.cidr);
if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
#ifdef CONFIG_BRIDGE_NETFILTER
const struct nf_bridge_info *nf_bridge = skb->nf_bridge;
if (!nf_bridge)
return -EINVAL;
data.iface = SRCDIR ? PHYSDEV(physindev) : PHYSDEV(physoutdev);
data.physdev = 1;
#else
data.iface = NULL;
#endif
} else
data.iface = SRCDIR ? IFACE(in) : IFACE(out);
if (!data.iface)
return -EINVAL;
ret = iface_test(&h->rbtree, &data.iface);
if (adt == IPSET_ADD) {
if (!ret) {
ret = iface_add(&h->rbtree, &data.iface);
if (ret)
return ret;
}
} else if (!ret)
return ret;
return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
}
static int
hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
struct ip_set_hash *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netiface6_elem data = { .cidr = HOST_MASK };
u32 timeout = h->timeout;
char iface[IFNAMSIZ] = {};
int ret;
if (unlikely(!tb[IPSET_ATTR_IP] ||
!tb[IPSET_ATTR_IFACE] ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
return -IPSET_ERR_PROTOCOL;
if (unlikely(tb[IPSET_ATTR_IP_TO]))
return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
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]);
}
strcpy(iface, nla_data(tb[IPSET_ATTR_IFACE]));
data.iface = iface;
ret = iface_test(&h->rbtree, &data.iface);
if (adt == IPSET_ADD) {
if (!ret) {
ret = iface_add(&h->rbtree, &data.iface);
if (ret)
return ret;
}
} else if (!ret)
return ret;
if (tb[IPSET_ATTR_CADT_FLAGS]) {
u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
if (cadt_flags & IPSET_FLAG_PHYSDEV)
data.physdev = 1;
}
ret = adtfn(set, &data, timeout, flags);
return ip_set_eexist(ret, flags) ? 0 : ret;
}
/* Create hash:ip type of sets */
static int
hash_netiface_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
{
struct ip_set_hash *h;
u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
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;
h->ahash_max = AHASH_MAX_SIZE;
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;
h->rbtree = RB_ROOT;
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_netiface4_tvariant : &hash_netiface6_tvariant;
if (set->family == AF_INET)
hash_netiface4_gc_init(set);
else
hash_netiface6_gc_init(set);
} else {
set->variant = set->family == AF_INET
? &hash_netiface4_variant : &hash_netiface6_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_netiface_type __read_mostly = {
.name = "hash:net,iface",
.protocol = IPSET_PROTOCOL,
.features = IPSET_TYPE_IP | IPSET_TYPE_IFACE,
.dimension = IPSET_DIM_TWO,
.family = AF_UNSPEC,
.revision_min = 0,
.create = hash_netiface_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_PROTO] = { .type = NLA_U8 },
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
},
.adt_policy = {
[IPSET_ATTR_IP] = { .type = NLA_NESTED },
[IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
[IPSET_ATTR_IFACE] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1 },
[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
[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_netiface_init(void)
{
return ip_set_type_register(&hash_netiface_type);
}
static void __exit
hash_netiface_fini(void)
{
ip_set_type_unregister(&hash_netiface_type);
}
module_init(hash_netiface_init);
module_exit(hash_netiface_fini);