2 * Copyright (c) 2014 - 2018 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Bill Yuan <bycn82@dragonflybsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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38 #define MODULE_NAT_ID 4
39 #define MODULE_NAT_NAME "nat"
42 #define ALIAS_RANGE 64511
43 #define ALIAS_BEGIN 1024
45 #define LEN_IN_ADDR sizeof(struct in_addr)
47 enum ipfw_nat_opcodes {
51 struct ioc_nat_state {
52 struct in_addr src_addr;
53 struct in_addr dst_addr;
54 struct in_addr alias_addr;
64 #define LEN_IOC_NAT_STATE sizeof(struct ioc_nat_state)
71 #define LEN_IOC_NAT sizeof(struct ioc_nat)
73 typedef struct _ipfw_insn_nat {
82 * Each NAT state contains the tuple (saddr,sport,daddr,dport,proto) and a pair
83 * of alias(alias_addr & alias_port).
84 * For outgoing TCP & UDP packets, the alias will be the after NAT src
85 * For incoming TCP & UDP packets, its alias will be the original src info.
86 * For ICMP packets, the icmp_id will be stored in the alias.
89 RB_ENTRY(nat_state) entries;
98 #define LEN_NAT_STATE sizeof(struct nat_state)
100 /* nat_state for the incoming packets */
110 #define LEN_NAT_STATE2 sizeof(struct nat_state2)
112 int ip_fw3_nat_state_cmp(struct nat_state *s1, struct nat_state *s2);
114 RB_HEAD(state_tree, nat_state);
119 LIST_HEAD(, cfg_alias) alias; /* list of the alias IP */
121 struct state_tree rb_tcp_out;
122 struct state_tree rb_udp_out;
123 struct state_tree rb_icmp_out;
126 #define LEN_CFG_NAT sizeof(struct cfg_nat)
129 LIST_ENTRY(cfg_alias) next;
131 struct nat_state2 *tcp_in[ALIAS_RANGE];
132 struct nat_state2 *udp_in[ALIAS_RANGE];
133 struct nat_state2 *icmp_in[ALIAS_RANGE];
135 #define LEN_CFG_ALIAS sizeof(struct cfg_alias)
137 /* place to hold the nat conf */
138 struct ip_fw3_nat_context {
139 struct cfg_nat *nats[NAT_ID_MAX];
142 struct netmsg_nat_del {
143 struct netmsg_base base;
147 struct netmsg_nat_add {
148 struct netmsg_base base;
149 struct ioc_nat ioc_nat;
152 struct netmsg_nat_state_add {
153 struct netmsg_base base;
154 struct nat_state2 *state;
155 struct in_addr alias_addr;
160 #define LEN_NMSG_NAT_STATE_ADD sizeof(struct netmsg_nat_state_add)
162 void check_nat(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
163 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len);
165 int ip_fw3_nat(struct ip_fw_args *, struct cfg_nat *, struct mbuf *);
167 void pick_alias_port(struct nat_state *s, struct state_tree *tree);
169 void nat_state_add_dispatch(netmsg_t msg);
170 void nat_add_dispatch(netmsg_t msg);
171 int ip_fw3_ctl_nat_add(struct sockopt *sopt);
172 void nat_del_dispatch(netmsg_t msg);
173 int ip_fw3_ctl_nat_del(struct sockopt *sopt);
174 int ip_fw3_ctl_nat_flush(struct sockopt *sopt);
175 void nat_init_ctx_dispatch(netmsg_t msg);
176 void nat_fnit_ctx_dispatch(netmsg_t msg);
177 int ip_fw3_ctl_nat_sockopt(struct sockopt *sopt);
178 int ip_fw3_ctl_nat_get_cfg(struct sockopt *sopt);
179 int ip_fw3_ctl_nat_get_record(struct sockopt *sopt);