ip_fw_nat64.c revision 340544 
1/*-
2 * Copyright (c) 2015-2018 Yandex LLC
3 * Copyright (c) 2015-2018 Andrey V. Elsukov <ae@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/11/sys/netpfil/ipfw/nat64/ip_fw_nat64.c 340544 2018-11-18 01:04:53Z ae $");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/lock.h>
35#include <sys/malloc.h>
36#include <sys/module.h>
37#include <sys/rwlock.h>
38#include <sys/socket.h>
39#include <sys/sysctl.h>
40
41#include <net/if.h>
42#include <net/vnet.h>
43
44#include <netinet/in.h>
45#include <netinet/ip_var.h>
46#include <netinet/ip_fw.h>
47
48#include <netpfil/ipfw/ip_fw_private.h>
49
50#include "ip_fw_nat64.h"
51
52VNET_DEFINE(int, nat64_debug) = 0;
53VNET_DEFINE(int, nat64_allow_private) = 0;
54
55SYSCTL_DECL(_net_inet_ip_fw);
56SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, nat64_debug, CTLFLAG_VNET | CTLFLAG_RW,
57    &VNET_NAME(nat64_debug), 0, "Debug level for NAT64 module");
58SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, nat64_allow_private,
59    CTLFLAG_VNET |CTLFLAG_RW, &VNET_NAME(nat64_allow_private), 0,
60    "Allow use of non-global IPv4 addresses with NAT64");
61
62static int
63vnet_ipfw_nat64_init(const void *arg __unused)
64{
65	struct ip_fw_chain *ch;
66	int first, error;
67
68	ch = &V_layer3_chain;
69	first = IS_DEFAULT_VNET(curvnet) ? 1: 0;
70	error = nat64stl_init(ch, first);
71	if (error != 0)
72		return (error);
73	error = nat64lsn_init(ch, first);
74	if (error != 0) {
75		nat64stl_uninit(ch, first);
76		return (error);
77	}
78	return (0);
79}
80
81static int
82vnet_ipfw_nat64_uninit(const void *arg __unused)
83{
84	struct ip_fw_chain *ch;
85	int last;
86
87	ch = &V_layer3_chain;
88	last = IS_DEFAULT_VNET(curvnet) ? 1: 0;
89	nat64stl_uninit(ch, last);
90	nat64lsn_uninit(ch, last);
91	return (0);
92}
93
94static int
95ipfw_nat64_modevent(module_t mod, int type, void *unused)
96{
97
98	switch (type) {
99	case MOD_LOAD:
100	case MOD_UNLOAD:
101		break;
102	default:
103		return (EOPNOTSUPP);
104	}
105	return (0);
106}
107
108static moduledata_t ipfw_nat64_mod = {
109	"ipfw_nat64",
110	ipfw_nat64_modevent,
111	0
112};
113
114/* Define startup order. */
115#define	IPFW_NAT64_SI_SUB_FIREWALL	SI_SUB_PROTO_IFATTACHDOMAIN
116#define	IPFW_NAT64_MODEVENT_ORDER	(SI_ORDER_ANY - 128) /* after ipfw */
117#define	IPFW_NAT64_MODULE_ORDER		(IPFW_NAT64_MODEVENT_ORDER + 1)
118#define	IPFW_NAT64_VNET_ORDER		(IPFW_NAT64_MODEVENT_ORDER + 2)
119
120DECLARE_MODULE(ipfw_nat64, ipfw_nat64_mod, IPFW_NAT64_SI_SUB_FIREWALL,
121    SI_ORDER_ANY);
122MODULE_DEPEND(ipfw_nat64, ipfw, 3, 3, 3);
123MODULE_VERSION(ipfw_nat64, 1);
124
125VNET_SYSINIT(vnet_ipfw_nat64_init, IPFW_NAT64_SI_SUB_FIREWALL,
126    IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_init, NULL);
127VNET_SYSUNINIT(vnet_ipfw_nat64_uninit, IPFW_NAT64_SI_SUB_FIREWALL,
128    IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_uninit, NULL);
129