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("$FreeBSD$"); 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 54 VNET_DEFINE(int, nat64_debug) = 0; 55 56 SYSCTL_DECL(_net_inet_ip_fw); 57 SYSCTL_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 60 static int 61 sysctl_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 } 74 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, nat64_direct_output, 75 CTLFLAG_VNET | CTLTYPE_U32 | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 76 0, 0, sysctl_direct_output, "IU", 77 "Use if_output directly instead of deffered netisr-based processing"); 78 79 static int 80 vnet_ipfw_nat64_init(const void *arg __unused) 81 { 82 struct ip_fw_chain *ch; 83 int first, error; 84 85 ch = &V_layer3_chain; 86 first = IS_DEFAULT_VNET(curvnet) ? 1: 0; 87 /* Initialize V_nat64out methods explicitly. */ 88 nat64_set_output_method(0); 89 error = nat64stl_init(ch, first); 90 if (error != 0) 91 return (error); 92 error = nat64clat_init(ch, first); 93 if (error != 0) { 94 nat64stl_uninit(ch, first); 95 return (error); 96 } 97 error = nat64lsn_init(ch, first); 98 if (error != 0) { 99 nat64stl_uninit(ch, first); 100 nat64clat_uninit(ch, first); 101 return (error); 102 } 103 return (0); 104 } 105 106 static int 107 vnet_ipfw_nat64_uninit(const void *arg __unused) 108 { 109 struct ip_fw_chain *ch; 110 int last; 111 112 ch = &V_layer3_chain; 113 last = IS_DEFAULT_VNET(curvnet) ? 1: 0; 114 nat64stl_uninit(ch, last); 115 nat64clat_uninit(ch, last); 116 nat64lsn_uninit(ch, last); 117 return (0); 118 } 119 120 static int 121 ipfw_nat64_modevent(module_t mod, int type, void *unused) 122 { 123 124 switch (type) { 125 case MOD_LOAD: 126 case MOD_UNLOAD: 127 break; 128 default: 129 return (EOPNOTSUPP); 130 } 131 return (0); 132 } 133 134 static moduledata_t ipfw_nat64_mod = { 135 "ipfw_nat64", 136 ipfw_nat64_modevent, 137 0 138 }; 139 140 /* Define startup order. */ 141 #define IPFW_NAT64_SI_SUB_FIREWALL SI_SUB_PROTO_IFATTACHDOMAIN 142 #define IPFW_NAT64_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */ 143 #define IPFW_NAT64_MODULE_ORDER (IPFW_NAT64_MODEVENT_ORDER + 1) 144 #define IPFW_NAT64_VNET_ORDER (IPFW_NAT64_MODEVENT_ORDER + 2) 145 146 DECLARE_MODULE(ipfw_nat64, ipfw_nat64_mod, IPFW_NAT64_SI_SUB_FIREWALL, 147 SI_ORDER_ANY); 148 MODULE_DEPEND(ipfw_nat64, ipfw, 3, 3, 3); 149 MODULE_VERSION(ipfw_nat64, 1); 150 151 VNET_SYSINIT(vnet_ipfw_nat64_init, IPFW_NAT64_SI_SUB_FIREWALL, 152 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_init, NULL); 153 VNET_SYSUNINIT(vnet_ipfw_nat64_uninit, IPFW_NAT64_SI_SUB_FIREWALL, 154 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_uninit, NULL); 155