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 52 VNET_DEFINE(int, nat64_debug) = 0; 53 VNET_DEFINE(int, nat64_allow_private) = 0; 54 55 SYSCTL_DECL(_net_inet_ip_fw); 56 SYSCTL_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 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, nat64_allow_private, 59 CTLFLAG_VNET |CTLFLAG_RW, &VNET_NAME(nat64_allow_private), 0, 60 "Allow use of non-global IPv4 addresses with NAT64"); 61 62 static int 63 vnet_ipfw_nat64_init(const void *arg __unused) 64 { 65 struct ip_fw_chain *ch; 66 int first, error; 67 68 ch = &V_layer3_chain; 69 first = IS_DEFAULT_VNET(curvnet) ? 1: 0; 70 error = nat64stl_init(ch, first); 71 if (error != 0) 72 return (error); 73 error = nat64lsn_init(ch, first); 74 if (error != 0) { 75 nat64stl_uninit(ch, first); 76 return (error); 77 } 78 return (0); 79 } 80 81 static int 82 vnet_ipfw_nat64_uninit(const void *arg __unused) 83 { 84 struct ip_fw_chain *ch; 85 int last; 86 87 ch = &V_layer3_chain; 88 last = IS_DEFAULT_VNET(curvnet) ? 1: 0; 89 nat64stl_uninit(ch, last); 90 nat64lsn_uninit(ch, last); 91 return (0); 92 } 93 94 static int 95 ipfw_nat64_modevent(module_t mod, int type, void *unused) 96 { 97 98 switch (type) { 99 case MOD_LOAD: 100 case MOD_UNLOAD: 101 break; 102 default: 103 return (EOPNOTSUPP); 104 } 105 return (0); 106 } 107 108 static moduledata_t ipfw_nat64_mod = { 109 "ipfw_nat64", 110 ipfw_nat64_modevent, 111 0 112 }; 113 114 /* Define startup order. */ 115 #define IPFW_NAT64_SI_SUB_FIREWALL SI_SUB_PROTO_IFATTACHDOMAIN 116 #define IPFW_NAT64_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */ 117 #define IPFW_NAT64_MODULE_ORDER (IPFW_NAT64_MODEVENT_ORDER + 1) 118 #define IPFW_NAT64_VNET_ORDER (IPFW_NAT64_MODEVENT_ORDER + 2) 119 120 DECLARE_MODULE(ipfw_nat64, ipfw_nat64_mod, IPFW_NAT64_SI_SUB_FIREWALL, 121 SI_ORDER_ANY); 122 MODULE_DEPEND(ipfw_nat64, ipfw, 3, 3, 3); 123 MODULE_VERSION(ipfw_nat64, 1); 124 125 VNET_SYSINIT(vnet_ipfw_nat64_init, IPFW_NAT64_SI_SUB_FIREWALL, 126 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_init, NULL); 127 VNET_SYSUNINIT(vnet_ipfw_nat64_uninit, IPFW_NAT64_SI_SUB_FIREWALL, 128 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_uninit, NULL); 129