/* Copyright (C) 2007-2017  B.A.T.M.A.N. contributors:

   *
   * Marek Lindner, Simon Wunderlich
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License

   * along with this program; if not, see <http://www.gnu.org/licenses/>.

   */
  
  #ifndef _NET_BATMAN_ADV_MAIN_H_
  #define _NET_BATMAN_ADV_MAIN_H_

  #define BATADV_DRIVER_AUTHOR "Marek Lindner <mareklindner@neomailbox.ch>, " \

  			     "Simon Wunderlich <sw@simonwunderlich.de>"

  #define BATADV_DRIVER_DESC   "B.A.T.M.A.N. advanced"
  #define BATADV_DRIVER_DEVICE "batman-adv"

  #ifndef BATADV_SOURCE_VERSION

  #define BATADV_SOURCE_VERSION "2017.3"

  #endif

  
  /* B.A.T.M.A.N. parameters */

  #define BATADV_TQ_MAX_VALUE 255

  #define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF

  #define BATADV_JITTER 20

  /* Time To Live of broadcast messages */

  #define BATADV_TTL 50

  /* maximum sequence number age of broadcast messages */
  #define BATADV_BCAST_MAX_AGE 64

  /* purge originators after time in seconds if no valid packet comes in

   * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE

   */

  #define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */

  #define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */

  #define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */

  #define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */

  #define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */
  #define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */

  #define BATADV_MCAST_WORK_PERIOD 500 /* 0.5 seconds */

  #define BATADV_DAT_ENTRY_TIMEOUT (5 * 60000) /* 5 mins in milliseconds */

  /* sliding packet range of received originator messages in sequence numbers

   * (should be a multiple of our word size)
   */

  #define BATADV_TQ_LOCAL_WINDOW_SIZE 64

  /* milliseconds we have to keep pending tt_req */

  #define BATADV_TT_REQUEST_TIMEOUT 3000

  #define BATADV_TQ_GLOBAL_WINDOW_SIZE 5
  #define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
  #define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
  #define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1

  /* B.A.T.M.A.N. V */

  #define BATADV_THROUGHPUT_DEFAULT_VALUE 10 /* 1 Mbps */

  #define BATADV_ELP_PROBES_PER_NODE 2
  #define BATADV_ELP_MIN_PROBE_SIZE 200 /* bytes */
  #define BATADV_ELP_PROBE_MAX_TX_DIFF 100 /* milliseconds */

  #define BATADV_ELP_MAX_AGE 64

  #define BATADV_OGM_MAX_ORIGDIFF 5
  #define BATADV_OGM_MAX_AGE 64

  /* number of OGMs sent with the last tt diff */
  #define BATADV_TT_OGM_APPEND_MAX 3

  /* Time in which a client can roam at most ROAMING_MAX_COUNT times in

   * milliseconds

   */

  #define BATADV_ROAMING_MAX_TIME 20000
  #define BATADV_ROAMING_MAX_COUNT 5

  #define BATADV_NO_FLAGS 0

  #define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */

  #define BATADV_NO_MARK 0

  /* default interface for multi interface operation. The default interface is
   * used for communication which originated locally (i.e. is not forwarded)
   * or where special forwarding is not desired/necessary.
   */
  #define BATADV_IF_DEFAULT	((struct batadv_hard_iface *)NULL)

  #define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE)

  #define BATADV_LOG_BUF_LEN 8192	  /* has to be a power of 2 */

  /* number of packets to send for broadcasts on different interface types */
  #define BATADV_NUM_BCASTS_DEFAULT 1
  #define BATADV_NUM_BCASTS_WIRELESS 3
  #define BATADV_NUM_BCASTS_MAX 3

  /* length of the single packet used by the TP meter */
  #define BATADV_TP_PACKET_LEN ETH_DATA_LEN

  /* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
  #define ARP_REQ_DELAY 250

  /* numbers of originator to contact for any PUT/GET DHT operation */
  #define BATADV_DAT_CANDIDATES_NUM 3

  /* BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ
   * at most from the primary one in order to be still considered acceptable

   */
  #define BATADV_TQ_SIMILARITY_THRESHOLD 50

  /* should not be bigger than 512 bytes or change the size of

   * forw_packet->direct_link_flags
   */

  #define BATADV_MAX_AGGREGATION_BYTES 512
  #define BATADV_MAX_AGGREGATION_MS 100

  #define BATADV_BLA_PERIOD_LENGTH	10000	/* 10 seconds */

  #define BATADV_BLA_BACKBONE_TIMEOUT	(BATADV_BLA_PERIOD_LENGTH * 6)

  #define BATADV_BLA_CLAIM_TIMEOUT	(BATADV_BLA_PERIOD_LENGTH * 10)

  #define BATADV_BLA_WAIT_PERIODS		3

  #define BATADV_BLA_LOOPDETECT_PERIODS	6
  #define BATADV_BLA_LOOPDETECT_TIMEOUT	3000	/* 3 seconds */

  #define BATADV_DUPLIST_SIZE		16
  #define BATADV_DUPLIST_TIMEOUT		500	/* 500 ms */

  /* don't reset again within 30 seconds */

  #define BATADV_RESET_PROTECTION_MS 30000
  #define BATADV_EXPECTED_SEQNO_RANGE	65536

  #define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */

  /**
   * BATADV_TP_MAX_NUM - maximum number of simultaneously active tp sessions
   */
  #define BATADV_TP_MAX_NUM 5

  enum batadv_mesh_state {
  	BATADV_MESH_INACTIVE,
  	BATADV_MESH_ACTIVE,
  	BATADV_MESH_DEACTIVATING,

  };

  #define BATADV_BCAST_QUEUE_LEN		256
  #define BATADV_BATMAN_QUEUE_LEN	256

  enum batadv_uev_action {
  	BATADV_UEV_ADD = 0,
  	BATADV_UEV_DEL,
  	BATADV_UEV_CHANGE,

  	BATADV_UEV_LOOPDETECT,

  };

  enum batadv_uev_type {
  	BATADV_UEV_GW = 0,

  	BATADV_UEV_BLA,

  };

  #define BATADV_GW_THRESHOLD	50

  /* Number of fragment chains for each orig_node */
  #define BATADV_FRAG_BUFFER_COUNT 8
  /* Maximum number of fragments for one packet */
  #define BATADV_FRAG_MAX_FRAGMENTS 16
  /* Maxumim size of each fragment */

  #define BATADV_FRAG_MAX_FRAG_SIZE 1280

  /* Time to keep fragments while waiting for rest of the fragments */
  #define BATADV_FRAG_TIMEOUT 10000

  #define BATADV_DAT_CANDIDATE_NOT_FOUND	0
  #define BATADV_DAT_CANDIDATE_ORIG	1

  /* Debug Messages */

  #ifdef pr_fmt
  #undef pr_fmt
  #endif

  /* Append 'batman-adv: ' before kernel messages */
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  /* Kernel headers */

  #include <linux/bitops.h> /* for packet.h */
  #include <linux/compiler.h>

  #include <linux/etherdevice.h>
  #include <linux/if_ether.h> /* for packet.h */

  #include <linux/if_vlan.h>
  #include <linux/jiffies.h>

  #include <linux/percpu.h>

  #include <linux/types.h>

  #include "packet.h"

  #include "types.h"

  struct net_device;
  struct packet_type;

  struct seq_file;
  struct sk_buff;

  /**
   * batadv_print_vid - return printable version of vid information
   * @vid: the VLAN identifier
   *
   * Return: -1 when no VLAN is used, VLAN id otherwise
   */
  static inline int batadv_print_vid(unsigned short vid)
  {
  	if (vid & BATADV_VLAN_HAS_TAG)
  		return (int)(vid & VLAN_VID_MASK);
  	else
  		return -1;
  }

  extern struct list_head batadv_hardif_list;
  
  extern unsigned char batadv_broadcast_addr[];
  extern struct workqueue_struct *batadv_event_workqueue;
  
  int batadv_mesh_init(struct net_device *soft_iface);
  void batadv_mesh_free(struct net_device *soft_iface);

  bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr);

  struct batadv_hard_iface *
  batadv_seq_print_text_primary_if_get(struct seq_file *seq);

  int batadv_max_header_len(void);

  void batadv_skb_set_priority(struct sk_buff *skb, int offset);

  int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
  			   struct packet_type *ptype,
  			   struct net_device *orig_dev);

  int

  batadv_recv_handler_register(u8 packet_type,

  			     int (*recv_handler)(struct sk_buff *,
  						 struct batadv_hard_iface *));

  void batadv_recv_handler_unregister(u8 packet_type);

  __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);

  /**

   * batadv_compare_eth - Compare two not u16 aligned Ethernet addresses

   * @data1: Pointer to a six-byte array containing the Ethernet address
   * @data2: Pointer other six-byte array containing the Ethernet address

   *

   * note: can't use ether_addr_equal() as it requires aligned memory

   *

   * Return: true if they are the same ethernet addr

   */

  static inline bool batadv_compare_eth(const void *data1, const void *data2)

  {

  	return ether_addr_equal_unaligned(data1, data2);

  }

  /**

   * batadv_has_timed_out - compares current time (jiffies) and timestamp +
   *  timeout

   * @timestamp:		base value to compare with (in jiffies)
   * @timeout:		added to base value before comparing (in milliseconds)
   *

   * Return: true if current time is after timestamp + timeout

   */

  static inline bool batadv_has_timed_out(unsigned long timestamp,
  					unsigned int timeout)

  {
  	return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout));
  }

  #define batadv_atomic_dec_not_zero(v)	atomic_add_unless((v), -1, 0)

  /* Returns the smallest signed integer in two's complement with the sizeof x */

  #define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))

  
  /* Checks if a sequence number x is a predecessor/successor of y.
   * they handle overflows/underflows and can correctly check for a
   * predecessor/successor unless the variable sequence number has grown by
   * more then 2**(bitwidth(x)-1)-1.

   * This means that for a u8 with the maximum value 255, it would think:

   *  - when adding nothing - it is neither a predecessor nor a successor
   *  - before adding more than 127 to the starting value - it is a predecessor,
   *  - when adding 128 - it is neither a predecessor nor a successor,

   *  - after adding more than 127 to the starting value - it is a successor
   */

  #define batadv_seq_before(x, y) ({typeof(x)_d1 = (x); \
  				 typeof(y)_d2 = (y); \
  				 typeof(x)_dummy = (_d1 - _d2); \
  				 (void)(&_d1 == &_d2); \

  				 _dummy > batadv_smallest_signed_int(_dummy); })
  #define batadv_seq_after(x, y) batadv_seq_before(y, x)

  /* Stop preemption on local cpu while incrementing the counter */

  static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,

  				      size_t count)
  {

  	this_cpu_add(bat_priv->bat_counters[idx], count);

  }
  
  #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)

  /* Define a macro to reach the control buffer of the skb. The members of the
   * control buffer are defined in struct batadv_skb_cb in types.h.
   * The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h.
   */
  #define BATADV_SKB_CB(__skb)       ((struct batadv_skb_cb *)&((__skb)->cb[0]))

  unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len);

  bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid);

  #endif /* _NET_BATMAN_ADV_MAIN_H_ */