/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright 2005, Gleb Smirnoff <glebius@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#define NG_NAT_NODE_TYPE    "nat"
#define NGM_NAT_COOKIE      1107718711

#define NG_NAT_HOOK_IN  "in"
#define NG_NAT_HOOK_OUT "out"

/* Arguments for NGM_NAT_SET_MODE message */
struct ng_nat_mode {
        uint32_t        flags;
        uint32_t        mask;
};

/* Keep this in sync with the above structure definition */
#define NG_NAT_MODE_INFO {                              \
          { "flags",    &ng_parse_uint32_type   },      \
          { "mask",     &ng_parse_uint32_type   },      \
          { NULL }                                      \
}

#define NG_NAT_LOG                      0x01
#define NG_NAT_DENY_INCOMING            0x02
#define NG_NAT_SAME_PORTS               0x04
#define NG_NAT_UNREGISTERED_ONLY        0x10
#define NG_NAT_RESET_ON_ADDR_CHANGE     0x20
#define NG_NAT_PROXY_ONLY               0x40
#define NG_NAT_REVERSE                  0x80
#define NG_NAT_UNREGISTERED_CGN         0x100
#define NG_NAT_UDP_EIM                  0x200

#define NG_NAT_DESC_LENGTH      64
#define NG_NAT_REDIRPROTO_ADDR  (IPPROTO_MAX + 3)       /* LibAlias' LINK_ADDR, also unused in in.h */

/* Arguments for NGM_NAT_REDIRECT_PORT message */
struct ng_nat_redirect_port {
        struct in_addr  local_addr;
        struct in_addr  alias_addr;
        struct in_addr  remote_addr;
        uint16_t        local_port;
        uint16_t        alias_port;
        uint16_t        remote_port;
        uint8_t         proto;
        char            description[NG_NAT_DESC_LENGTH];
};

/* Keep this in sync with the above structure definition */
#define NG_NAT_REDIRECT_PORT_TYPE_INFO(desctype) {              \
          { "local_addr",       &ng_parse_ipaddr_type   },      \
          { "alias_addr",       &ng_parse_ipaddr_type   },      \
          { "remote_addr",      &ng_parse_ipaddr_type   },      \
          { "local_port",       &ng_parse_uint16_type   },      \
          { "alias_port",       &ng_parse_uint16_type   },      \
          { "remote_port",      &ng_parse_uint16_type   },      \
          { "proto",            &ng_parse_uint8_type    },      \
          { "description",      (desctype)              },      \
          { NULL }                                              \
}

/* Arguments for NGM_NAT_REDIRECT_ADDR message */
struct ng_nat_redirect_addr {
        struct in_addr  local_addr;
        struct in_addr  alias_addr;
        char            description[NG_NAT_DESC_LENGTH];
};

/* Keep this in sync with the above structure definition */
#define NG_NAT_REDIRECT_ADDR_TYPE_INFO(desctype) {              \
          { "local_addr",       &ng_parse_ipaddr_type   },      \
          { "alias_addr",       &ng_parse_ipaddr_type   },      \
          { "description",      (desctype)              },      \
          { NULL }                                              \
}

/* Arguments for NGM_NAT_REDIRECT_PROTO message */
struct ng_nat_redirect_proto {
        struct in_addr  local_addr;
        struct in_addr  alias_addr;
        struct in_addr  remote_addr;
        uint8_t         proto;
        char            description[NG_NAT_DESC_LENGTH];
};

/* Keep this in sync with the above structure definition */
#define NG_NAT_REDIRECT_PROTO_TYPE_INFO(desctype) {             \
          { "local_addr",       &ng_parse_ipaddr_type   },      \
          { "alias_addr",       &ng_parse_ipaddr_type   },      \
          { "remote_addr",      &ng_parse_ipaddr_type   },      \
          { "proto",            &ng_parse_uint8_type    },      \
          { "description",      (desctype)              },      \
          { NULL }                                              \
}

/* Arguments for NGM_NAT_ADD_SERVER message */
struct ng_nat_add_server {
        uint32_t        id;
        struct in_addr  addr;
        uint16_t        port;
};

/* Keep this in sync with the above structure definition */
#define NG_NAT_ADD_SERVER_TYPE_INFO {                           \
          { "id",               &ng_parse_uint32_type   },      \
          { "addr",             &ng_parse_ipaddr_type   },      \
          { "port",             &ng_parse_uint16_type   },      \
          { NULL }                                              \
}

/* List entry of array returned in NGM_NAT_LIST_REDIRECTS message */
struct ng_nat_listrdrs_entry {
        uint32_t        id;             /* Anything except zero */
        struct in_addr  local_addr;
        struct in_addr  alias_addr;
        struct in_addr  remote_addr;
        uint16_t        local_port;
        uint16_t        alias_port;
        uint16_t        remote_port;
        uint16_t        proto;          /* Valid proto or NG_NAT_REDIRPROTO_ADDR */
        uint16_t        lsnat;          /* LSNAT servers count */
        char            description[NG_NAT_DESC_LENGTH];
};

/* Keep this in sync with the above structure definition */
#define NG_NAT_LISTRDRS_ENTRY_TYPE_INFO(desctype) {                     \
          { "id",               &ng_parse_uint32_type   },      \
          { "local_addr",       &ng_parse_ipaddr_type   },      \
          { "alias_addr",       &ng_parse_ipaddr_type   },      \
          { "remote_addr",      &ng_parse_ipaddr_type   },      \
          { "local_port",       &ng_parse_uint16_type   },      \
          { "alias_port",       &ng_parse_uint16_type   },      \
          { "remote_port",      &ng_parse_uint16_type   },      \
          { "proto",            &ng_parse_uint16_type   },      \
          { "lsnat",            &ng_parse_uint16_type   },      \
          { "description",      (desctype)              },      \
          { NULL }                                              \
}

/* Structure returned by NGM_NAT_LIST_REDIRECTS */
struct ng_nat_list_redirects {
        uint32_t                total_count;
        struct ng_nat_listrdrs_entry redirects[];
};

/* Keep this in sync with the above structure definition */
#define NG_NAT_LIST_REDIRECTS_TYPE_INFO(redirtype) {            \
          { "total_count",      &ng_parse_uint32_type   },      \
          { "redirects",        (redirtype)             },      \
          { NULL }                                              \
}

/* Structure returned by NGM_NAT_LIBALIAS_INFO */
struct ng_nat_libalias_info {
        uint32_t        icmpLinkCount;
        uint32_t        udpLinkCount;
        uint32_t        tcpLinkCount;
        uint32_t        sctpLinkCount;
        uint32_t        pptpLinkCount;
        uint32_t        protoLinkCount;
        uint32_t        fragmentIdLinkCount;
        uint32_t        fragmentPtrLinkCount;
        uint32_t        sockCount;
};

/* Keep this in sync with the above structure definition */
#define NG_NAT_LIBALIAS_INFO {                                  \
          { "icmpLinkCount",    &ng_parse_uint32_type   },      \
          { "udpLinkCount",     &ng_parse_uint32_type   },      \
          { "tcpLinkCount",     &ng_parse_uint32_type   },      \
          { "sctpLinkCount",    &ng_parse_uint32_type   },      \
          { "pptpLinkCount",    &ng_parse_uint32_type   },      \
          { "protoLinkCount",   &ng_parse_uint32_type   },      \
          { "fragmentIdLinkCount", &ng_parse_uint32_type },     \
          { "fragmentPtrLinkCount", &ng_parse_uint32_type },    \
          { "sockCount",        &ng_parse_uint32_type   },      \
          { NULL }                                              \
}

enum {
        NGM_NAT_SET_IPADDR = 1,
        NGM_NAT_SET_MODE,
        NGM_NAT_SET_TARGET,
        NGM_NAT_REDIRECT_PORT,
        NGM_NAT_REDIRECT_ADDR,
        NGM_NAT_REDIRECT_PROTO,
        NGM_NAT_REDIRECT_DYNAMIC,
        NGM_NAT_REDIRECT_DELETE,
        NGM_NAT_ADD_SERVER,
        NGM_NAT_LIST_REDIRECTS,
        NGM_NAT_PROXY_RULE,
        NGM_NAT_LIBALIAS_INFO,
        NGM_NAT_SET_DLT,
        NGM_NAT_GET_DLT,
};