/*
   * INET		An implementation of the TCP/IP protocol suite for the LINUX
   *		operating system.  INET is implemented using the  BSD Socket
   *		interface as the means of communication with the user level.
   *
   *		Definitions for the "ping" module.
   *
   *		This program is free software; you can redistribute it and/or
   *		modify it under the terms of the GNU General Public License
   *		as published by the Free Software Foundation; either version
   *		2 of the License, or (at your option) any later version.
   */
  #ifndef _PING_H
  #define _PING_H

  #include <net/icmp.h>

  #include <net/netns/hash.h>
  
  /* PING_HTABLE_SIZE must be power of 2 */
  #define PING_HTABLE_SIZE 	64
  #define PING_HTABLE_MASK 	(PING_HTABLE_SIZE-1)
  
  #define ping_portaddr_for_each_entry(__sk, node, list) \
  	hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
  
  /*
   * gid_t is either uint or ushort.  We want to pass it to
   * proc_dointvec_minmax(), so it must not be larger than MAX_INT
   */
  #define GID_T_MAX (((gid_t)~0U) >> 1)

  /* Compatibility glue so we can support IPv6 when it's compiled as a module */
  struct pingv6_ops {

  	int (*ipv6_recv_error)(struct sock *sk, struct msghdr *msg, int len,
  			       int *addr_len);

  	void (*ip6_datagram_recv_common_ctl)(struct sock *sk,
  					     struct msghdr *msg,
  					     struct sk_buff *skb);
  	void (*ip6_datagram_recv_specific_ctl)(struct sock *sk,
  					       struct msghdr *msg,
  					       struct sk_buff *skb);

  	int (*icmpv6_err_convert)(u8 type, u8 code, int *err);
  	void (*ipv6_icmp_error)(struct sock *sk, struct sk_buff *skb, int err,
  				__be16 port, u32 info, u8 *payload);
  	int (*ipv6_chk_addr)(struct net *net, const struct in6_addr *addr,

  			     const struct net_device *dev, int strict);

  };

  struct ping_iter_state {
  	struct seq_net_private  p;
  	int			bucket;

  	sa_family_t		family;

  };
  
  extern struct proto ping_prot;

  #if IS_ENABLED(CONFIG_IPV6)
  extern struct pingv6_ops pingv6_ops;
  #endif

  struct pingfakehdr {
  	struct icmphdr icmph;

  	struct msghdr *msg;

  	sa_family_t family;
  	__wsum wcheck;
  };

  int  ping_get_port(struct sock *sk, unsigned short ident);

  int ping_hash(struct sock *sk);

  void ping_unhash(struct sock *sk);
  
  int  ping_init_sock(struct sock *sk);
  void ping_close(struct sock *sk, long timeout);
  int  ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len);
  void ping_err(struct sk_buff *skb, int offset, u32 info);
  int  ping_getfrag(void *from, char *to, int offset, int fraglen, int odd,
  		  struct sk_buff *);

  int  ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
  		  int flags, int *addr_len);

  int  ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
  			 void *user_icmph, size_t icmph_len);

  int  ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);

  bool ping_rcv(struct sk_buff *skb);

  #ifdef CONFIG_PROC_FS

  struct ping_seq_afinfo {
  	char				*name;
  	sa_family_t			family;
  	const struct file_operations	*seq_fops;
  	const struct seq_operations	seq_ops;
  };

  extern const struct file_operations ping_seq_fops;
  
  void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family);
  void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos);
  void ping_seq_stop(struct seq_file *seq, void *v);
  int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo);
  void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo);

  int __init ping_proc_init(void);
  void ping_proc_exit(void);

  #endif
  
  void __init ping_init(void);

  int  __init pingv6_init(void);
  void pingv6_exit(void);

  
  #endif /* _PING_H */