// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2003-2013 Jozsef Kadlecsik <[email protected]> */
/* Kernel module implementing an IP set type: the hash:ip,port 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_getport.h>
#include <linux/netfilter/ipset/ip_set_hash.h>
#define IPSET_TYPE_REV_MIN 0
/* 1 SCTP and UDPLITE support added */
/* 2 Counters support added */
/* 3 Comments support added */
/* 4 Forceadd support added */
/* 5 skbinfo support added */
/* 6 bucketsize, initval support added */
#define IPSET_TYPE_REV_MAX 7 /* bitmask support added */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <[email protected]>");
IP_SET_MODULE_DESC("hash:ip,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
MODULE_ALIAS("ip_set_hash:ip,port");
/* Type specific function prefix */
#define HTYPE hash_ipport
#define IP_SET_HASH_WITH_NETMASK
#define IP_SET_HASH_WITH_BITMASK
/* IPv4 variant */
/* Member elements */
struct hash_ipport4_elem {
__be32 ip;
__be16 port;
u8 proto;
u8 padding;
};
/* Common functions */
static bool
hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1,
const struct hash_ipport4_elem *ip2,
u32 *multi)
{
return ip1->ip == ip2->ip &&
ip1->port == ip2->port &&
ip1->proto == ip2->proto;
}
static bool
hash_ipport4_data_list(struct sk_buff *skb,
const struct hash_ipport4_elem *data)
{
if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
goto nla_put_failure;
return false;
nla_put_failure:
return true;
}
static void
hash_ipport4_data_next(struct hash_ipport4_elem *next,
const struct hash_ipport4_elem *d)
{
next->ip = d->ip;
next->port = d->port;
}
#define MTYPE hash_ipport4
#define HOST_MASK 32
#include "ip_set_hash_gen.h"
static int
hash_ipport4_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)
{
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_ipport4_elem e = { .ip = 0 };
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
const struct MTYPE *h = set->data;
if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
&e.port, &e.proto))
return -EINVAL;
ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
e.ip &= h->bitmask.ip;
if (e.ip == 0)
return -EINVAL;
return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
}
static int
hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
struct hash_ipport4 *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_ipport4_elem e = { .ip = 0 };
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
u32 ip, ip_to = 0, p = 0, port, port_to, i = 0;
bool with_ports = false;
int ret;
if (tb[IPSET_ATTR_LINENO])
*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
if (unlikely(!tb[IPSET_ATTR_IP] ||
!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
return -IPSET_ERR_PROTOCOL;
ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
if (ret)
return ret;
ret = ip_set_get_extensions(set, tb, &ext);
if (ret)
return ret;
e.ip &= h->bitmask.ip;
if (e.ip == 0)
return -EINVAL;
e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
if (tb[IPSET_ATTR_PROTO]) {
e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
with_ports = ip_set_proto_with_ports(e.proto);
if (e.proto == 0)
return -IPSET_ERR_INVALID_PROTO;
} else {
return -IPSET_ERR_MISSING_PROTO;
}
if (!(with_ports || e.proto == IPPROTO_ICMP))
e.port = 0;
if (adt == IPSET_TEST ||
!(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
tb[IPSET_ATTR_PORT_TO])) {
ret = adtfn(set, &e, &ext, &ext, flags);
return ip_set_eexist(ret, flags) ? 0 : ret;
}
ip_to = ip = ntohl(e.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 > HOST_MASK)
return -IPSET_ERR_INVALID_CIDR;
ip_set_mask_from_to(ip, ip_to, cidr);
}
port_to = port = ntohs(e.port);
if (with_ports && 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 (retried)
ip = ntohl(h->next.ip);
for (; ip <= ip_to; ip++) {
p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
: port;
for (; p <= port_to; p++, i++) {
e.ip = htonl(ip);
e.port = htons(p);
if (i > IPSET_MAX_RANGE) {
hash_ipport4_data_next(&h->next, &e);
return -ERANGE;
}
ret = adtfn(set, &e, &ext, &ext, flags);
if (ret && !ip_set_eexist(ret, flags))
return ret;
ret = 0;
}
}
return ret;
}
/* IPv6 variant */
struct hash_ipport6_elem {
union nf_inet_addr ip;
__be16 port;
u8 proto;
u8 padding;
};
/* Common functions */
static bool
hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
const struct hash_ipport6_elem *ip2,
u32 *multi)
{
return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
ip1->port == ip2->port &&
ip1->proto == ip2->proto;
}
static bool
hash_ipport6_data_list(struct sk_buff *skb,
const struct hash_ipport6_elem *data)
{
if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
goto nla_put_failure;
return false;
nla_put_failure:
return true;
}
static void
hash_ipport6_data_next(struct hash_ipport6_elem *next,
const struct hash_ipport6_elem *d)
{
next->port = d->port;
}
#undef MTYPE
#undef HOST_MASK
#define MTYPE hash_ipport6
#define HOST_MASK 128
#define IP_SET_EMIT_CREATE
#include "ip_set_hash_gen.h"
static int
hash_ipport6_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)
{
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
const struct MTYPE *h = set->data;
if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
&e.port, &e.proto))
return -EINVAL;
ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
nf_inet_addr_mask_inplace(&e.ip, &h->bitmask);
if (ipv6_addr_any(&e.ip.in6))
return -EINVAL;
return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
}
static int
hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
const struct hash_ipport6 *h = set->data;
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
u32 port, port_to;
bool with_ports = false;
int ret;
if (tb[IPSET_ATTR_LINENO])
*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
if (unlikely(!tb[IPSET_ATTR_IP] ||
!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
return -IPSET_ERR_PROTOCOL;
if (unlikely(tb[IPSET_ATTR_IP_TO]))
return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
if (unlikely(tb[IPSET_ATTR_CIDR])) {
u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
if (cidr != HOST_MASK)
return -IPSET_ERR_INVALID_CIDR;
}
ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
if (ret)
return ret;
ret = ip_set_get_extensions(set, tb, &ext);
if (ret)
return ret;
nf_inet_addr_mask_inplace(&e.ip, &h->bitmask);
if (ipv6_addr_any(&e.ip.in6))
return -EINVAL;
e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
if (tb[IPSET_ATTR_PROTO]) {
e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
with_ports = ip_set_proto_with_ports(e.proto);
if (e.proto == 0)
return -IPSET_ERR_INVALID_PROTO;
} else {
return -IPSET_ERR_MISSING_PROTO;
}
if (!(with_ports || e.proto == IPPROTO_ICMPV6))
e.port = 0;
if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
ret = adtfn(set, &e, &ext, &ext, flags);
return ip_set_eexist(ret, flags) ? 0 : ret;
}
port = ntohs(e.port);
port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
if (port > port_to)
swap(port, port_to);
if (retried)
port = ntohs(h->next.port);
for (; port <= port_to; port++) {
e.port = htons(port);
ret = adtfn(set, &e, &ext, &ext, flags);
if (ret && !ip_set_eexist(ret, flags))
return ret;
ret = 0;
}
return ret;
}
static struct ip_set_type hash_ipport_type __read_mostly = {
.name = "hash:ip,port",
.protocol = IPSET_PROTOCOL,
.features = IPSET_TYPE_IP | IPSET_TYPE_PORT,
.dimension = IPSET_DIM_TWO,
.family = NFPROTO_UNSPEC,
.revision_min = IPSET_TYPE_REV_MIN,
.revision_max = IPSET_TYPE_REV_MAX,
.create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
.create = hash_ipport_create,
.create_policy = {
[IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
[IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
[IPSET_ATTR_INITVAL] = { .type = NLA_U32 },
[IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
[IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
[IPSET_ATTR_PROTO] = { .type = NLA_U8 },
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
[IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
[IPSET_ATTR_BITMASK] = { .type = NLA_NESTED },
},
.adt_policy = {
[IPSET_ATTR_IP] = { .type = NLA_NESTED },
[IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
[IPSET_ATTR_PORT] = { .type = NLA_U16 },
[IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
[IPSET_ATTR_CIDR] = { .type = NLA_U8 },
[IPSET_ATTR_PROTO] = { .type = NLA_U8 },
[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
hash_ipport_init(void)
{
return ip_set_type_register(&hash_ipport_type);
}
static void __exit
hash_ipport_fini(void)
{
rcu_barrier();
ip_set_type_unregister(&hash_ipport_type);
}
module_init(hash_ipport_init);
module_exit(hash_ipport_fini);
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