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 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 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 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 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