ip_fw_nat64.c revision 346211
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: stable/11/sys/netpfil/ipfw/nat64/ip_fw_nat64.c 346211 2019-04-14 12:35:58Z ae $"); 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 54VNET_DEFINE(int, nat64_debug) = 0; 55 56SYSCTL_DECL(_net_inet_ip_fw); 57SYSCTL_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 60static int 61sysctl_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} 74SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, nat64_direct_output, 75 CTLFLAG_VNET | CTLTYPE_U32 | CTLFLAG_RW, 0, 0, sysctl_direct_output, "IU", 76 "Use if_output directly instead of deffered netisr-based processing"); 77 78static int 79vnet_ipfw_nat64_init(const void *arg __unused) 80{ 81 struct ip_fw_chain *ch; 82 int first, error; 83 84 ch = &V_layer3_chain; 85 first = IS_DEFAULT_VNET(curvnet) ? 1: 0; 86 error = nat64stl_init(ch, first); 87 if (error != 0) 88 return (error); 89 error = nat64lsn_init(ch, first); 90 if (error != 0) { 91 nat64stl_uninit(ch, first); 92 return (error); 93 } 94 return (0); 95} 96 97static int 98vnet_ipfw_nat64_uninit(const void *arg __unused) 99{ 100 struct ip_fw_chain *ch; 101 int last; 102 103 ch = &V_layer3_chain; 104 last = IS_DEFAULT_VNET(curvnet) ? 1: 0; 105 nat64stl_uninit(ch, last); 106 nat64lsn_uninit(ch, last); 107 return (0); 108} 109 110static int 111ipfw_nat64_modevent(module_t mod, int type, void *unused) 112{ 113 114 switch (type) { 115 case MOD_LOAD: 116 case MOD_UNLOAD: 117 break; 118 default: 119 return (EOPNOTSUPP); 120 } 121 return (0); 122} 123 124static moduledata_t ipfw_nat64_mod = { 125 "ipfw_nat64", 126 ipfw_nat64_modevent, 127 0 128}; 129 130/* Define startup order. */ 131#define IPFW_NAT64_SI_SUB_FIREWALL SI_SUB_PROTO_IFATTACHDOMAIN 132#define IPFW_NAT64_MODEVENT_ORDER (SI_ORDER_ANY - 128) /* after ipfw */ 133#define IPFW_NAT64_MODULE_ORDER (IPFW_NAT64_MODEVENT_ORDER + 1) 134#define IPFW_NAT64_VNET_ORDER (IPFW_NAT64_MODEVENT_ORDER + 2) 135 136DECLARE_MODULE(ipfw_nat64, ipfw_nat64_mod, IPFW_NAT64_SI_SUB_FIREWALL, 137 SI_ORDER_ANY); 138MODULE_DEPEND(ipfw_nat64, ipfw, 3, 3, 3); 139MODULE_VERSION(ipfw_nat64, 1); 140 141VNET_SYSINIT(vnet_ipfw_nat64_init, IPFW_NAT64_SI_SUB_FIREWALL, 142 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_init, NULL); 143VNET_SYSUNINIT(vnet_ipfw_nat64_uninit, IPFW_NAT64_SI_SUB_FIREWALL, 144 IPFW_NAT64_VNET_ORDER, vnet_ipfw_nat64_uninit, NULL); 145