/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2006 Vadim Goncharov <vadimnuclight@tpu.ru>
 * 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 unmodified, 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.
 */

#ifndef _NETGRAPH_NG_TAG_H_
#define _NETGRAPH_NG_TAG_H_

/* Node type name and magic cookie. */
#define NG_TAG_NODE_TYPE        "tag"
#define NGM_TAG_COOKIE          1149771193

/*
 * The types of tag_cookie, tag_len and tag_id in structures below
 * must be the same as corresponding members m_tag_cookie, m_tag_len
 * and m_tag_id in struct m_tag (defined in <sys/mbuf.h>).
 */

/* Tag match structure for every (input) hook. */
struct ng_tag_hookin {
        char            thisHook[NG_HOOKSIZ];           /* name of hook */
        char            ifMatch[NG_HOOKSIZ];            /* match dest hook */
        char            ifNotMatch[NG_HOOKSIZ];         /* !match dest hook */
        uint8_t         strip;                          /* strip tag if found */
        uint32_t        tag_cookie;                     /* ABI/Module ID */
        uint16_t        tag_id;                         /* tag ID */
        uint16_t        tag_len;                        /* length of data */
        uint8_t         tag_data[0];                    /* tag data */
};

/* Tag set structure for every (output) hook. */
struct ng_tag_hookout {
        char            thisHook[NG_HOOKSIZ];           /* name of hook */
        uint32_t        tag_cookie;                     /* ABI/Module ID */
        uint16_t        tag_id;                         /* tag ID */
        uint16_t        tag_len;                        /* length of data */
        uint8_t         tag_data[0];                    /* tag data */
};

#define NG_TAG_HOOKIN_SIZE(taglen)      \
        (sizeof(struct ng_tag_hookin) + (taglen))

#define NG_TAG_HOOKOUT_SIZE(taglen)     \
        (sizeof(struct ng_tag_hookout) + (taglen))

/* Keep this in sync with the above structures definitions. */
#define NG_TAG_HOOKIN_TYPE_INFO(tdtype) {               \
          { "thisHook",         &ng_parse_hookbuf_type  },      \
          { "ifMatch",          &ng_parse_hookbuf_type  },      \
          { "ifNotMatch",       &ng_parse_hookbuf_type  },      \
          { "strip",            &ng_parse_uint8_type    },      \
          { "tag_cookie",       &ng_parse_uint32_type   },      \
          { "tag_id",           &ng_parse_uint16_type   },      \
          { "tag_len",          &ng_parse_uint16_type   },      \
          { "tag_data",         (tdtype)                },      \
          { NULL }                                              \
}

#define NG_TAG_HOOKOUT_TYPE_INFO(tdtype)        {               \
          { "thisHook",         &ng_parse_hookbuf_type  },      \
          { "tag_cookie",       &ng_parse_uint32_type   },      \
          { "tag_id",           &ng_parse_uint16_type   },      \
          { "tag_len",          &ng_parse_uint16_type   },      \
          { "tag_data",         (tdtype)                },      \
          { NULL }                                              \
}

#ifdef NG_TAG_DEBUG

/* Statistics structure for one hook. */
struct ng_tag_hookstat {
        uint64_t        recvFrames;
        uint64_t        recvOctets;
        uint64_t        recvMatchFrames;
        uint64_t        recvMatchOctets;
        uint64_t        xmitFrames;
        uint64_t        xmitOctets;
};

/* Keep this in sync with the above structure definition. */
#define NG_TAG_HOOKSTAT_TYPE_INFO       {                       \
          { "recvFrames",       &ng_parse_uint64_type   },      \
          { "recvOctets",       &ng_parse_uint64_type   },      \
          { "recvMatchFrames",  &ng_parse_uint64_type   },      \
          { "recvMatchOctets",  &ng_parse_uint64_type   },      \
          { "xmitFrames",       &ng_parse_uint64_type   },      \
          { "xmitOctets",       &ng_parse_uint64_type   },      \
          { NULL }                                              \
}

#endif /* NG_TAG_DEBUG */

/* Netgraph commands. */
enum {
        NGM_TAG_SET_HOOKIN = 1,         /* supply a struct ng_tag_hookin */
        NGM_TAG_GET_HOOKIN,             /* returns a struct ng_tag_hookin */
        NGM_TAG_SET_HOOKOUT,            /* supply a struct ng_tag_hookout */
        NGM_TAG_GET_HOOKOUT,            /* returns a struct ng_tag_hookout */
#ifdef NG_TAG_DEBUG
        NGM_TAG_GET_STATS,              /* supply name as char[NG_HOOKSIZ] */
        NGM_TAG_CLR_STATS,              /* supply name as char[NG_HOOKSIZ] */
        NGM_TAG_GETCLR_STATS,           /* supply name as char[NG_HOOKSIZ] */
#endif
};

#endif /* _NETGRAPH_NG_TAG_H_ */