ip_fw_nat64.c revision 348997 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2015-2019 Yandex LLC
5 * Copyright (c) 2015-2019 Andrey V. Elsukov <ae@FreeBSD.org>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/sys/netpfil/ipfw/nat64/ip_fw_nat64.c 348997 2019-06-12 16:34:02Z ae $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/kernel.h>
35#include <sys/lock.h>
36#include <sys/malloc.h>
37#include <sys/module.h>
38#include <sys/rwlock.h>
39#include <sys/socket.h>
40#include <sys/sysctl.h>
41
42#include <net/if.h>
43#include <net/vnet.h>
44
45#include <netinet/in.h>
46#include <netinet/ip_var.h>
47#include <netinet/ip_fw.h>
48
49#include <netpfil/ipfw/ip_fw_private.h>
50
51#include "ip_fw_nat64.h"
52#include "nat64_translate.h"
53
54VNET_DEFINE(int, nat64_debug) = 0;
55
56SYSCTL_DECL(_net_inet_ip_fw);
57SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, nat64_debug, CTLFLAG_VNET | CTLFLAG_RW,
58    &VNET_NAME(nat64_debug), 0, "Debug level for NAT64 module");
59
60static int
61sysctl_direct_output(SYSCTL_HANDLER_ARGS)
62{
63	uint32_t value;
64	int error;
65
66	value = nat64_get_output_method();
67	error = sysctl_handle_32(oidp, &value, 0, req);
68	/* Read operation or some error */
69	if ((error != 0) || (req->newptr == NULL))
70		return (error);
71	nat64_set_output_method(value);
72	return (0);
73}
74SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, nat64_direct_output,
75    CTLFLAG_VNET | CTLTYPE_U32 | CTLFLAG_RW, 0, 0, sysctl_direct_output, "IU",
76    "Use if_output directly instead of deffered netisr-based processing");
77
78static int
79vnet_ipfw_nat64_init(const void *arg __unused)
80{
81	struct ip_fw_chain *ch;
82	int first, error;
83
84	ch = &V_layer3_chain;
85	first = IS_DEFAULT_VNET(curvnet) ? 1: 0;
86	/* Initialize V_nat64out methods explicitly. */
87	nat64_set_output_method(0);
88	error = nat64stl_init(ch, first);
89	if (error != 0)
90		return (error);
91	error = nat64clat_init(ch, first);
92	if (error != 0) {
93		nat64stl_uninit(ch, first);
94		return (error);
95	}
96	error = nat64lsn_init(ch, first);
97	if (error != 0) {
98		nat64stl_uninit(ch, first);
99		nat64clat_uninit(ch, first);
100		return (error);
101	}
102	return (0);
103}
104
105static int
106vnet_ipfw_nat64_uninit(const void *arg __unused)
107{
108	struct ip_fw_chain *ch;
109	int last;
110
111	ch = &V_layer3_chain;
112	last = IS_DEFAULT_VNET(curvnet) ? 1: 0;
113	nat64stl_uninit(ch, last);
114	nat64clat_uninit(ch, last);
115	nat64lsn_uninit(ch, last);
116	return (0);
117}
118
119static int
120ipfw_nat64_modevent(module_t mod, int type, void *unused)
121{
122
123	switch (type) {
124	case MOD_LOAD:
125	case MOD_UNLOAD:
126		break;
127	default:
128		return (EOPNOTSUPP);
129	}
130	return (0);
131}
132
133static moduledata_t ipfw_nat64_mod = {
134	"ipfw_nat64",
135	ipfw_nat64_modevent,
136	0
137};
138
139/* Define startup order. */
140#define	IPFW_NAT64_SI_SUB_FIREWALL	SI_SUB_PROTO_IFATTACHDOMAIN
141#define	IPFW_NAT64_MODEVENT_ORDER	(SI_ORDER_ANY - 128) /* after ipfw */
142#define	IPFW_NAT64_MODULE_ORDER		(IPFW_NAT64_MODEVENT_ORDER + 1)
143#define	IPFW_NAT64_VNET_ORDER		(IPFW_NAT64_MODEVENT_ORDER + 2)
144
145DECLARE_MODULE(ipfw_nat64, ipfw_nat64_mod, IPFW_NAT64_SI_SUB_FIREWALL,
146    SI_ORDER_ANY);
147MODULE_DEPEND(ipfw_nat64, ipfw, 3, 3, 3);
148MODULE_VERSION(ipfw_nat64, 1);
149
150VNET_SYSINIT(vnet_ipfw_nat64_init, IPFW_NAT64_SI_SUB_FIREWALL,
151    IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_init, NULL);
152VNET_SYSUNINIT(vnet_ipfw_nat64_uninit, IPFW_NAT64_SI_SUB_FIREWALL,
153    IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_uninit, NULL);
154