/*
   *	Linux NET3:	Internet Group Management Protocol  [IGMP]
   *
   *	Authors:

   *		Alan Cox <alan@lxorguk.ukuu.org.uk>

   *
   *	Extended to talk the BSD extended IGMP protocol of mrouted 3.6
   *
   *
   *	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 _LINUX_IGMP_H
  #define _LINUX_IGMP_H

  #include <linux/skbuff.h>

  #include <linux/timer.h>

  #include <linux/in.h>

  #include <linux/refcount.h>

  #include <uapi/linux/igmp.h>

  static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
  {
  	return (struct igmphdr *)skb_transport_header(skb);
  }
  
  static inline struct igmpv3_report *
  			igmpv3_report_hdr(const struct sk_buff *skb)
  {
  	return (struct igmpv3_report *)skb_transport_header(skb);
  }
  
  static inline struct igmpv3_query *
  			igmpv3_query_hdr(const struct sk_buff *skb)
  {
  	return (struct igmpv3_query *)skb_transport_header(skb);
  }

  struct ip_sf_socklist {

  	unsigned int		sl_max;
  	unsigned int		sl_count;

  	struct rcu_head		rcu;

  	__be32			sl_addr[0];

  };
  
  #define IP_SFLSIZE(count)	(sizeof(struct ip_sf_socklist) + \

  	(count) * sizeof(__be32))

  
  #define IP_SFBLOCK	10	/* allocate this many at once */
  
  /* ip_mc_socklist is real list now. Speed is not argument;
     this list never used in fast path code
   */

  struct ip_mc_socklist {

  	struct ip_mc_socklist __rcu *next_rcu;

  	struct ip_mreqn		multi;
  	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */

  	struct ip_sf_socklist __rcu	*sflist;

  	struct rcu_head		rcu;

  };

  struct ip_sf_list {

  	struct ip_sf_list	*sf_next;

  	__be32			sf_inaddr;

  	unsigned long		sf_count[2];	/* include/exclude counts */
  	unsigned char		sf_gsresp;	/* include in g & s response? */
  	unsigned char		sf_oldin;	/* change state */
  	unsigned char		sf_crcount;	/* retrans. left to send */
  };

  struct ip_mc_list {

  	struct in_device	*interface;

  	__be32			multiaddr;

  	unsigned int		sfmode;

  	struct ip_sf_list	*sources;
  	struct ip_sf_list	*tomb;

  	unsigned long		sfcount[2];

  	union {
  		struct ip_mc_list *next;
  		struct ip_mc_list __rcu *next_rcu;
  	};

  	struct ip_mc_list __rcu *next_hash;

  	struct timer_list	timer;
  	int			users;

  	refcount_t		refcnt;

  	spinlock_t		lock;
  	char			tm_running;
  	char			reporter;
  	char			unsolicit_count;
  	char			loaded;
  	unsigned char		gsquery;	/* check source marks? */
  	unsigned char		crcount;

  	struct rcu_head		rcu;

  };
  
  /* V3 exponential field decoding */
  #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
  #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
  	((value) < (thresh) ? (value) : \

          ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \

           (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
  
  #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
  #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)

  extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto);

  extern int igmp_rcv(struct sk_buff *);
  extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
  extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
  extern void ip_mc_drop_socket(struct sock *sk);
  extern int ip_mc_source(int add, int omode, struct sock *sk,
  		struct ip_mreq_source *mreqs, int ifindex);
  extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
  extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
  		struct ip_msfilter __user *optval, int __user *optlen);
  extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
  		struct group_filter __user *optval, int __user *optlen);

  extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt,
  			  int dif, int sdif);

  extern void ip_mc_init_dev(struct in_device *);
  extern void ip_mc_destroy_dev(struct in_device *);
  extern void ip_mc_up(struct in_device *);
  extern void ip_mc_down(struct in_device *);

  extern void ip_mc_unmap(struct in_device *);
  extern void ip_mc_remap(struct in_device *);

  extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
  extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);

  int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed);

  #endif