text: /** @file
   @brief 6lowpan handler
  
   This is not to be included by the application.
   */
  
  /*
   * Copyright (c) 2016 Intel Corporation
   *
   * SPDX-License-Identifier: Apache-2.0
   */
  
  #ifndef __NET_6LO_H
  #define __NET_6LO_H
  
  #include <sys/slist.h>
  #include <zephyr/types.h>
  
  #include <net/net_pkt.h>
  #include "icmpv6.h"
  
  /**
   *  @brief Compress IPv6 packet as per RFC 6282
   *
   *  @details After this IPv6 packet and next header(if UDP), headers
   *  are compressed as per RFC 6282. After header compression data
   *  will be adjusted according to remaining space in fragments.
   *
   *  @param Pointer to network packet
   *  @param iphc true for IPHC compression, false for IPv6 dispatch header
   *
   *  @return header size difference on success (>= 0), negative errno otherwise
   */
  #if defined(CONFIG_NET_6LO)
  int net_6lo_compress(struct net_pkt *pkt, bool iphc);
  #else
  static inline int net_6lo_compress(struct net_pkt *pkt, bool iphc)
  {
  	ARG_UNUSED(pkt);
  	ARG_UNUSED(iphc);
  
  	return 0;
  }
  #endif
  
  /**
   *  @brief Uncompress IPv6 packet as per RFC 6282
   *
   *  @details After this IPv6 packet and next header(if UDP), headers
   *  are uncompressed as per RFC 6282. After header uncompression data
   *  will be adjusted according to remaining space in fragments.
   *
   *  @param Pointer to network packet
   *
   *  @return True on success, false otherwise
   */
  #if defined(CONFIG_NET_6LO)
  bool net_6lo_uncompress(struct net_pkt *pkt);
  #else
  static inline bool net_6lo_uncompress(struct net_pkt *pkt)
  {
  	ARG_UNUSED(pkt);
  
  	return true;
  }
  #endif
  
  /**
   *  @brief Set 6lowpan context information
   *
   *  @details Set 6lowpan context information. This context information
   *  will be used in IPv6 header compression and uncompression.
   *
   *  @return True on success, false otherwise
   */
  #if defined(CONFIG_NET_6LO_CONTEXT)
  void net_6lo_set_context(struct net_if *iface,
  			 struct net_icmpv6_nd_opt_6co *context);
  #endif
  
  /**
   *  @brief Return the header size difference after uncompression
   *
   * @details This will do a dry-run on uncompressing the headers.
   *          The point is only to calculate the difference.
   *
   * @param Pointer to network packet
   *
   * @return header difference or INT_MAX in case of error.
   */
  #if defined(CONFIG_NET_6LO)
  int net_6lo_uncompress_hdr_diff(struct net_pkt *pkt);
  #endif
  
  #endif /* __NET_6LO_H */
  