1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/lock.h>
33 #include <sys/malloc.h>
34 #include <sys/module.h>
35 #include <sys/rwlock.h>
36 #include <sys/socket.h>
37 #include <sys/sysctl.h>
38
39 #include <net/if.h>
40 #include <net/vnet.h>
41
42 #include <netinet/in.h>
43 #include <netinet/ip_var.h>
44 #include <netinet/ip_fw.h>
45
46 #include <netpfil/ipfw/ip_fw_private.h>
47
48 #include "ip_fw_nat64.h"
49 #include "nat64_translate.h"
50
51 VNET_DEFINE(int, nat64_debug) = 0;
52
53 SYSCTL_DECL(_net_inet_ip_fw);
54 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, nat64_debug, CTLFLAG_VNET | CTLFLAG_RW,
55 &VNET_NAME(nat64_debug), 0, "Debug level for NAT64 module");
56
57 static int
sysctl_direct_output(SYSCTL_HANDLER_ARGS)58 sysctl_direct_output(SYSCTL_HANDLER_ARGS)
59 {
60 uint32_t value;
61 int error;
62
63 value = nat64_get_output_method();
64 error = sysctl_handle_32(oidp, &value, 0, req);
65 /* Read operation or some error */
66 if ((error != 0) || (req->newptr == NULL))
67 return (error);
68 nat64_set_output_method(value);
69 return (0);
70 }
71 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, nat64_direct_output,
72 CTLFLAG_VNET | CTLTYPE_U32 | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
73 0, 0, sysctl_direct_output, "IU",
74 "Use if_output directly instead of deffered netisr-based processing");
75
76 static int
vnet_ipfw_nat64_init(const void * arg __unused)77 vnet_ipfw_nat64_init(const void *arg __unused)
78 {
79 struct ip_fw_chain *ch;
80 int first, error;
81
82 ch = &V_layer3_chain;
83 first = IS_DEFAULT_VNET(curvnet) ? 1: 0;
84 /* Initialize V_nat64out methods explicitly. */
85 nat64_set_output_method(0);
86 error = nat64stl_init(ch, first);
87 if (error != 0)
88 return (error);
89 error = nat64clat_init(ch, first);
90 if (error != 0) {
91 nat64stl_uninit(ch, first);
92 return (error);
93 }
94 error = nat64lsn_init(ch, first);
95 if (error != 0) {
96 nat64stl_uninit(ch, first);
97 nat64clat_uninit(ch, first);
98 return (error);
99 }
100 return (0);
101 }
102
103 static int
vnet_ipfw_nat64_uninit(const void * arg __unused)104 vnet_ipfw_nat64_uninit(const void *arg __unused)
105 {
106 struct ip_fw_chain *ch;
107 int last;
108
109 ch = &V_layer3_chain;
110 last = IS_DEFAULT_VNET(curvnet) ? 1: 0;
111 nat64stl_uninit(ch, last);
112 nat64clat_uninit(ch, last);
113 nat64lsn_uninit(ch, last);
114 return (0);
115 }
116
117 static int
ipfw_nat64_modevent(module_t mod,int type,void * unused)118 ipfw_nat64_modevent(module_t mod, int type, void *unused)
119 {
120
121 switch (type) {
122 case MOD_LOAD:
123 case MOD_UNLOAD:
124 break;
125 default:
126 return (EOPNOTSUPP);
127 }
128 return (0);
129 }
130
131 static moduledata_t ipfw_nat64_mod = {
132 "ipfw_nat64",
133 ipfw_nat64_modevent,
134 0
135 };
136
137 /* Define startup order. */
138 #define IPFW_NAT64_SI_SUB_FIREWALL SI_SUB_PROTO_IFATTACHDOMAIN
139 #define IPFW_NAT64_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */
140 #define IPFW_NAT64_MODULE_ORDER (IPFW_NAT64_MODEVENT_ORDER + 1)
141 #define IPFW_NAT64_VNET_ORDER (IPFW_NAT64_MODEVENT_ORDER + 2)
142
143 DECLARE_MODULE(ipfw_nat64, ipfw_nat64_mod, IPFW_NAT64_SI_SUB_FIREWALL,
144 SI_ORDER_ANY);
145 MODULE_DEPEND(ipfw_nat64, ipfw, 3, 3, 3);
146 MODULE_VERSION(ipfw_nat64, 1);
147
148 VNET_SYSINIT(vnet_ipfw_nat64_init, IPFW_NAT64_SI_SUB_FIREWALL,
149 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_init, NULL);
150 VNET_SYSUNINIT(vnet_ipfw_nat64_uninit, IPFW_NAT64_SI_SUB_FIREWALL,
151 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_uninit, NULL);
152