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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29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #define MODULE_NAT_ID 4
39 #define MODULE_NAT_NAME "nat"
42 #define LEN_IN_ADDR sizeof(struct in_addr)
44 enum ipfw_nat_opcodes {
48 struct ipfw_ioc_nat_state {
49 struct in_addr src_addr;
50 struct in_addr dst_addr;
51 struct in_addr alias_addr;
68 #define LEN_IOC_NAT sizeof(struct ioc_nat)
70 typedef struct _ipfw_insn_nat {
80 * Each NAT state contains the tuple (saddr,sport,daddr,dport,proto) and a pair
81 * of alias(alias_addr & alias_port).
82 * For outgoing TCP & UDP packets, the alias will be the after NAT src
83 * For incoming TCP & UDP packets, its alias will be the original src info.
84 * For ICMP packets, the icmp_id will be stored in the alias.
87 RB_ENTRY(nat_state) entries;
102 #define LEN_NAT_STATE sizeof(struct nat_state)
104 int nat_state_cmp(struct nat_state *s1, struct nat_state *s2);
106 RB_HEAD(state_tree, nat_state);
112 struct state_tree tree_tcp_in;
113 struct state_tree tree_tcp_out;
114 struct state_tree tree_udp_in;
115 struct state_tree tree_udp_out;
116 struct state_tree tree_icmp_in;
117 struct state_tree tree_icmp_out;
119 struct nat_state tmp;
121 #define LEN_CFG_NAT sizeof(struct cfg_nat)
124 MALLOC_DEFINE(M_IP_FW3_NAT, "IP_FW3_NAT", "IP_FW3 NAT module");
128 * Place to hold the NAT context
130 struct ip_fw3_nat_context {
131 struct cfg_nat *nats[NAT_ID_MAX];
133 #define LEN_NAT_CTX sizeof(struct ip_fw3_nat_context)
135 struct netmsg_nat_del {
136 struct netmsg_base base;
140 struct netmsg_nat_add {
141 struct netmsg_base base;
142 struct ioc_nat ioc_nat;
145 struct netmsg_alias_link_add {
146 struct netmsg_base base;
152 void check_nat(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
153 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len);
155 int ip_fw3_nat(struct ip_fw_args *args,
156 struct cfg_nat *nat, struct mbuf *m);
157 int nat_state_get_alias(struct nat_state *s,
158 struct cfg_nat *nat, struct state_tree *tree);
160 void add_alias_link_dispatch(netmsg_t nat_del_msg);
161 void nat_add_dispatch(netmsg_t msg);
162 int ip_fw3_ctl_nat_add(struct sockopt *sopt);
163 void nat_del_dispatch(netmsg_t msg);
164 int ip_fw3_ctl_nat_del(struct sockopt *sopt);
165 int ip_fw3_ctl_nat_flush(struct sockopt *sopt);
166 void nat_init_ctx_dispatch(netmsg_t msg);
167 int ip_fw3_ctl_nat_sockopt(struct sockopt *sopt);
168 int ip_fw3_ctl_nat_get_cfg(struct sockopt *sopt);
169 int ip_fw3_ctl_nat_get_record(struct sockopt *sopt);