ip_fw_nat64.c revision 346210 
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 346210 2019-04-14 12:34:30Z 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#include "nat64_translate.h"
52
53VNET_DEFINE(int, nat64_debug) = 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");
58
59static int
60sysctl_direct_output(SYSCTL_HANDLER_ARGS)
61{
62	uint32_t value;
63	int error;
64
65	value = nat64_get_output_method();
66	error = sysctl_handle_32(oidp, &value, 0, req);
67	/* Read operation or some error */
68	if ((error != 0) || (req->newptr == NULL))
69		return (error);
70	nat64_set_output_method(value);
71	return (0);
72}
73SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, nat64_direct_output,
74    CTLFLAG_VNET | CTLTYPE_U32 | CTLFLAG_RW, 0, 0, sysctl_direct_output, "IU",
75    "Use if_output directly instead of deffered netisr-based processing");
76
77static int
78vnet_ipfw_nat64_init(const void *arg __unused)
79{
80	struct ip_fw_chain *ch;
81	int first, error;
82
83	ch = &V_layer3_chain;
84	first = IS_DEFAULT_VNET(curvnet) ? 1: 0;
85	error = nat64stl_init(ch, first);
86	if (error != 0)
87		return (error);
88	error = nat64lsn_init(ch, first);
89	if (error != 0) {
90		nat64stl_uninit(ch, first);
91		return (error);
92	}
93	return (0);
94}
95
96static int
97vnet_ipfw_nat64_uninit(const void *arg __unused)
98{
99	struct ip_fw_chain *ch;
100	int last;
101
102	ch = &V_layer3_chain;
103	last = IS_DEFAULT_VNET(curvnet) ? 1: 0;
104	nat64stl_uninit(ch, last);
105	nat64lsn_uninit(ch, last);
106	return (0);
107}
108
109static int
110ipfw_nat64_modevent(module_t mod, int type, void *unused)
111{
112
113	switch (type) {
114	case MOD_LOAD:
115	case MOD_UNLOAD:
116		break;
117	default:
118		return (EOPNOTSUPP);
119	}
120	return (0);
121}
122
123static moduledata_t ipfw_nat64_mod = {
124	"ipfw_nat64",
125	ipfw_nat64_modevent,
126	0
127};
128
129/* Define startup order. */
130#define	IPFW_NAT64_SI_SUB_FIREWALL	SI_SUB_PROTO_IFATTACHDOMAIN
131#define	IPFW_NAT64_MODEVENT_ORDER	(SI_ORDER_ANY - 128) /* after ipfw */
132#define	IPFW_NAT64_MODULE_ORDER		(IPFW_NAT64_MODEVENT_ORDER + 1)
133#define	IPFW_NAT64_VNET_ORDER		(IPFW_NAT64_MODEVENT_ORDER + 2)
134
135DECLARE_MODULE(ipfw_nat64, ipfw_nat64_mod, IPFW_NAT64_SI_SUB_FIREWALL,
136    SI_ORDER_ANY);
137MODULE_DEPEND(ipfw_nat64, ipfw, 3, 3, 3);
138MODULE_VERSION(ipfw_nat64, 1);
139
140VNET_SYSINIT(vnet_ipfw_nat64_init, IPFW_NAT64_SI_SUB_FIREWALL,
141    IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_init, NULL);
142VNET_SYSUNINIT(vnet_ipfw_nat64_uninit, IPFW_NAT64_SI_SUB_FIREWALL,
143    IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_uninit, NULL);
144