// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2003-2013 Jozsef Kadlecsik <[email protected]> */
/* Kernel module implementing an IP set type: the bitmap:port type */
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <net/netlink.h>
#include <linux/netfilter/ipset/ip_set.h>
#include <linux/netfilter/ipset/ip_set_bitmap.h>
#include <linux/netfilter/ipset/ip_set_getport.h>
#define IPSET_TYPE_REV_MIN 0
/* 1 Counter support added */
/* 2 Comment support added */
#define IPSET_TYPE_REV_MAX 3 /* skbinfo support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <[email protected]>");
IP_SET_MODULE_DESC("bitmap:port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
MODULE_ALIAS("ip_set_bitmap:port");
#define MTYPE bitmap_port
/* Type structure */
struct bitmap_port {
unsigned long *members; /* the set members */
u16 first_port; /* host byte order, included in range */
u16 last_port; /* host byte order, included in range */
u32 elements; /* number of max elements in the set */
size_t memsize; /* members size */
struct timer_list gc; /* garbage collection */
struct ip_set *set; /* attached to this ip_set */
unsigned char extensions[] /* data extensions */
__aligned(__alignof__(u64));
};
/* ADT structure for generic function args */
struct bitmap_port_adt_elem {
u16 id;
};
static u16
port_to_id(const struct bitmap_port *m, u16 port)
{
return port - m->first_port;
}
/* Common functions */
static int
bitmap_port_do_test(const struct bitmap_port_adt_elem *e,
const struct bitmap_port *map, size_t dsize)
{
return !!test_bit(e->id, map->members);
}
static int
bitmap_port_gc_test(u16 id, const struct bitmap_port *map, size_t dsize)
{
return !!test_bit(id, map->members);
}
static int
bitmap_port_do_add(const struct bitmap_port_adt_elem *e,
struct bitmap_port *map, u32 flags, size_t dsize)
{
return !!test_bit(e->id, map->members);
}
static int
bitmap_port_do_del(const struct bitmap_port_adt_elem *e,
struct bitmap_port *map)
{
return !test_and_clear_bit(e->id, map->members);
}
static int
bitmap_port_do_list(struct sk_buff *skb, const struct bitmap_port *map, u32 id,
size_t dsize)
{
return nla_put_net16(skb, IPSET_ATTR_PORT,
htons(map->first_port + id));
}
static int
bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map)
{
return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) ||
nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
}
static bool
ip_set_get_ip_port(const struct sk_buff *skb, u8 pf, bool src, __be16 *port)
{
bool ret;
u8 proto;
switch (pf) {
case NFPROTO_IPV4:
ret = ip_set_get_ip4_port(skb, src, port, &proto);
break;
case NFPROTO_IPV6:
ret = ip_set_get_ip6_port(skb, src, port, &proto);
break;
default:
return false;
}
if (!ret)
return ret;
switch (proto) {
case IPPROTO_TCP:
case IPPROTO_UDP:
return true;
default:
return false;
}
}
static int
bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb,
const struct xt_action_param *par,
enum ipset_adt adt, struct ip_set_adt_opt *opt)
{
struct bitmap_port *map = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct bitmap_port_adt_elem e = { .id = 0 };
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
__be16 __port;
u16 port = 0;
if (!ip_set_get_ip_port(skb, opt->family,
opt->flags & IPSET_DIM_ONE_SRC, &__port))
return -EINVAL;
port = ntohs(__port);
if (port < map->first_port || port > map->last_port)
return -IPSET_ERR_BITMAP_RANGE;
e.id = port_to_id(map, port);
return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
}
static int
bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
struct bitmap_port *map = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct bitmap_port_adt_elem e = { .id = 0 };
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
u32 port; /* wraparound */
u16 port_to;
int ret = 0;
if (tb[IPSET_ATTR_LINENO])
*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
return -IPSET_ERR_PROTOCOL;
port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
if (port < map->first_port || port > map->last_port)
return -IPSET_ERR_BITMAP_RANGE;
ret = ip_set_get_extensions(set, tb, &ext);
if (ret)
return ret;
if (adt == IPSET_TEST) {
e.id = port_to_id(map, port);
return adtfn(set, &e, &ext, &ext, flags);
}
if (tb[IPSET_ATTR_PORT_TO]) {
port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
if (port > port_to) {
swap(port, port_to);
if (port < map->first_port)
return -IPSET_ERR_BITMAP_RANGE;
}
} else {
port_to = port;
}
if (port_to > map->last_port)
return -IPSET_ERR_BITMAP_RANGE;
for (; port <= port_to; port++) {
e.id = port_to_id(map, port);
ret = adtfn(set, &e, &ext, &ext, flags);
if (ret && !ip_set_eexist(ret, flags))
return ret;
ret = 0;
}
return ret;
}
static bool
bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b)
{
const struct bitmap_port *x = a->data;
const struct bitmap_port *y = b->data;
return x->first_port == y->first_port &&
x->last_port == y->last_port &&
a->timeout == b->timeout &&
a->extensions == b->extensions;
}
/* Plain variant */
struct bitmap_port_elem {
};
#include "ip_set_bitmap_gen.h"
/* Create bitmap:ip type of sets */
static bool
init_map_port(struct ip_set *set, struct bitmap_port *map,
u16 first_port, u16 last_port)
{
map->members = bitmap_zalloc(map->elements, GFP_KERNEL | __GFP_NOWARN);
if (!map->members)
return false;
map->first_port = first_port;
map->last_port = last_port;
set->timeout = IPSET_NO_TIMEOUT;
map->set = set;
set->data = map;
set->family = NFPROTO_UNSPEC;
return true;
}
static int
bitmap_port_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
u32 flags)
{
struct bitmap_port *map;
u16 first_port, last_port;
u32 elements;
if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
!ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
return -IPSET_ERR_PROTOCOL;
first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
if (first_port > last_port)
swap(first_port, last_port);
elements = last_port - first_port + 1;
set->dsize = ip_set_elem_len(set, tb, 0, 0);
map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
if (!map)
return -ENOMEM;
map->elements = elements;
map->memsize = BITS_TO_LONGS(elements) * sizeof(unsigned long);
set->variant = &bitmap_port;
if (!init_map_port(set, map, first_port, last_port)) {
ip_set_free(map);
return -ENOMEM;
}
if (tb[IPSET_ATTR_TIMEOUT]) {
set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
bitmap_port_gc_init(set, bitmap_port_gc);
}
return 0;
}
static struct ip_set_type bitmap_port_type = {
.name = "bitmap:port",
.protocol = IPSET_PROTOCOL,
.features = IPSET_TYPE_PORT,
.dimension = IPSET_DIM_ONE,
.family = NFPROTO_UNSPEC,
.revision_min = IPSET_TYPE_REV_MIN,
.revision_max = IPSET_TYPE_REV_MAX,
.create = bitmap_port_create,
.create_policy = {
[IPSET_ATTR_PORT] = { .type = NLA_U16 },
[IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
},
.adt_policy = {
[IPSET_ATTR_PORT] = { .type = NLA_U16 },
[IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
[IPSET_ATTR_BYTES] = { .type = NLA_U64 },
[IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
[IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
.len = IPSET_MAX_COMMENT_SIZE },
[IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
[IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
[IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
},
.me = THIS_MODULE,
};
static int __init
bitmap_port_init(void)
{
return ip_set_type_register(&bitmap_port_type);
}
static void __exit
bitmap_port_fini(void)
{
rcu_barrier();
ip_set_type_unregister(&bitmap_port_type);
}
module_init(bitmap_port_init);
module_exit(bitmap_port_fini);
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