/*
 * Copyright (c) 2021 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __HICN_PARSER_H__
#define __HICN_PARSER_H__

#include <vlib/vlib.h>

#include "hicn.h"
#include "error.h"
#include "infra.h"

/**
 * @file parser.h
 */

#define PARSE(PACKET_TYPE)                                                    \
  do                                                                          \
    {                                                                         \
      if (pkt == NULL)                                                        \
	return HICN_ERROR_PARSER_PKT_INVAL;                                   \
                                                                              \
      int ret = HICN_LIB_ERROR_NONE;                                          \
                                                                              \
      hicn_header_t *pkt_hdr;                                                 \
      u8 *ip_pkt;                                                             \
      u8 ip_proto;                                                            \
      int isv6;                                                               \
      u8 next_proto_offset;                                                   \
      hicn_type_t type;                                                       \
      hicn_name_t *name;                                                      \
      u16 *port;                                                              \
      hicn_lifetime_t *lifetime;                                              \
                                                                              \
      /* start parsing first fields to get the protocols */                   \
      pkt_hdr = vlib_buffer_get_current (pkt);                                \
      isv6 = hicn_is_v6 (pkt_hdr);                                            \
                                                                              \
      ip_pkt = vlib_buffer_get_current (pkt);                                 \
      ip_proto = (1 - isv6) * IPPROTO_IP + (isv6) *IPPROTO_IPV6;              \
                                                                              \
      /* in the ipv6 header the next header field is at byte 6 in the ipv4*/  \
      /* header the protocol field is at byte 9*/                             \
      next_proto_offset = 6 + (1 - isv6) * 3;                                 \
                                                                              \
      /* get type info*/                                                      \
      type.l4 = IPPROTO_NONE;                                                 \
      type.l3 = ip_pkt[next_proto_offset] == IPPROTO_UDP ? IPPROTO_ENCAP :    \
								 IPPROTO_NONE;      \
      type.l2 = ip_pkt[next_proto_offset];                                    \
      type.l1 = ip_proto;                                                     \
                                                                              \
      /* cache hicn packet type in opaque2*/                                  \
      hicn_get_buffer (pkt)->type = type;                                     \
                                                                              \
      /* get name and name length*/                                           \
      name = &hicn_get_buffer (pkt)->name;                                    \
      ret = hicn_ops_vft[type.l1]->get_##PACKET_TYPE##_name (                 \
	type, &pkt_hdr->protocol, name);                                      \
      if (PREDICT_FALSE (ret))                                                \
	{                                                                     \
	  if (type.l2 == IPPROTO_ICMPV4 || type.l2 == IPPROTO_ICMPV6)         \
	    {                                                                 \
	      return HICN_ERROR_PARSER_MAPME_PACKET;                          \
	    }                                                                 \
	  return HICN_ERROR_PARSER_PKT_INVAL;                                 \
	}                                                                     \
                                                                              \
      /* get source port*/                                                    \
      port = &hicn_get_buffer (pkt)->port;                                    \
      hicn_ops_vft[type.l1]->get_source_port (type, &pkt_hdr->protocol,       \
					      port);                          \
      if (PREDICT_FALSE (ret))                                                \
	{                                                                     \
	  return HICN_ERROR_PARSER_PKT_INVAL;                                 \
	}                                                                     \
                                                                              \
      /* get lifetime*/                                                       \
      lifetime = &hicn_get_buffer (pkt)->lifetime;                            \
      hicn_ops_vft[type.l1]->get_lifetime (type, &pkt_hdr->protocol,          \
					   lifetime);                         \
                                                                              \
      if (*lifetime > hicn_main.pit_lifetime_max_ms)                          \
	*lifetime = hicn_main.pit_lifetime_max_ms;                            \
                                                                              \
      return ret;                                                             \
    }                                                                         \
  while (0)

/**
 * @brief Parse a interest packet
 *
 * @param pkt vlib buffer holding the interest
 * @param name [RETURNED] variable that will point to the hicn name
 * @param namelen [RETURNED] variable that will hold the length of the name
 * @param port [RETURNED] variable that will hold the source port of the packet
 * @param pkt_hdrp [RETURNED] valiable that will point to the packet header
 * @param isv6 [RETURNED] variable that will be equale to 1 is the header is
 * ipv6
 */
always_inline int
hicn_interest_parse_pkt (vlib_buffer_t *pkt)
{
  PARSE (interest);
}

/**
 * @brief Parse a data packet
 *
 * @param pkt vlib buffer holding the data
 * @param name [RETURNED] variable that will point to the hicn name
 * @param namelen [RETURNED] variable that will hold the length of the name
 * @param port [RETURNED] variable that will hold the source port of the packet
 * @param pkt_hdrp [RETURNED] valiable that will point to the packet header
 * @param isv6 [RETURNED] variable that will be equale to 1 is the header is
 * ipv6
 */
always_inline int
hicn_data_parse_pkt (vlib_buffer_t *pkt)
{
  PARSE (data);
}

#endif /* __HICN_PARSER_H__ */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables: eval: (c-set-style "gnu") End:
 */