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("$FreeBSD$"); 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 53 VNET_DEFINE(int, nat64_debug) = 0; 54 VNET_DEFINE(int, nat64_allow_private) = 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 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, nat64_allow_private, 60 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nat64_allow_private), 0, 61 "Allow use of non-global IPv4 addresses with NAT64"); 62 63 static int 64 sysctl_direct_output(SYSCTL_HANDLER_ARGS) 65 { 66 uint32_t value; 67 int error; 68 69 value = nat64_get_output_method(); 70 error = sysctl_handle_32(oidp, &value, 0, req); 71 /* Read operation or some error */ 72 if ((error != 0) || (req->newptr == NULL)) 73 return (error); 74 nat64_set_output_method(value); 75 return (0); 76 } 77 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, nat64_direct_output, 78 CTLFLAG_VNET | CTLTYPE_U32 | CTLFLAG_RW, 0, 0, sysctl_direct_output, "IU", 79 "Use if_output directly instead of deffered netisr-based processing"); 80 81 static int 82 vnet_ipfw_nat64_init(const void *arg __unused) 83 { 84 struct ip_fw_chain *ch; 85 int first, error; 86 87 ch = &V_layer3_chain; 88 first = IS_DEFAULT_VNET(curvnet) ? 1: 0; 89 error = nat64stl_init(ch, first); 90 if (error != 0) 91 return (error); 92 error = nat64lsn_init(ch, first); 93 if (error != 0) { 94 nat64stl_uninit(ch, first); 95 return (error); 96 } 97 return (0); 98 } 99 100 static int 101 vnet_ipfw_nat64_uninit(const void *arg __unused) 102 { 103 struct ip_fw_chain *ch; 104 int last; 105 106 ch = &V_layer3_chain; 107 last = IS_DEFAULT_VNET(curvnet) ? 1: 0; 108 nat64stl_uninit(ch, last); 109 nat64lsn_uninit(ch, last); 110 return (0); 111 } 112 113 static int 114 ipfw_nat64_modevent(module_t mod, int type, void *unused) 115 { 116 117 switch (type) { 118 case MOD_LOAD: 119 case MOD_UNLOAD: 120 break; 121 default: 122 return (EOPNOTSUPP); 123 } 124 return (0); 125 } 126 127 static moduledata_t ipfw_nat64_mod = { 128 "ipfw_nat64", 129 ipfw_nat64_modevent, 130 0 131 }; 132 133 /* Define startup order. */ 134 #define IPFW_NAT64_SI_SUB_FIREWALL SI_SUB_PROTO_IFATTACHDOMAIN 135 #define IPFW_NAT64_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */ 136 #define IPFW_NAT64_MODULE_ORDER (IPFW_NAT64_MODEVENT_ORDER + 1) 137 #define IPFW_NAT64_VNET_ORDER (IPFW_NAT64_MODEVENT_ORDER + 2) 138 139 DECLARE_MODULE(ipfw_nat64, ipfw_nat64_mod, IPFW_NAT64_SI_SUB_FIREWALL, 140 SI_ORDER_ANY); 141 MODULE_DEPEND(ipfw_nat64, ipfw, 3, 3, 3); 142 MODULE_VERSION(ipfw_nat64, 1); 143 144 VNET_SYSINIT(vnet_ipfw_nat64_init, IPFW_NAT64_SI_SUB_FIREWALL, 145 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_init, NULL); 146 VNET_SYSUNINIT(vnet_ipfw_nat64_uninit, IPFW_NAT64_SI_SUB_FIREWALL, 147 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_uninit, NULL); 148