/*
   *	Linux NET3:	Internet Group Management Protocol  [IGMP]
   *
   *	Authors:
   *		Alan Cox <Alan.Cox@linux.org>
   *
   *	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 <asm/byteorder.h>
  
  /*
   *	IGMP protocol structures
   */
  
  /*
   *	Header in on cable format
   */
  
  struct igmphdr
  {
  	__u8 type;
  	__u8 code;		/* For newer IGMP */

  	__sum16 csum;

  	__be32 group;

  };
  
  /* V3 group record types [grec_type] */
  #define IGMPV3_MODE_IS_INCLUDE		1
  #define IGMPV3_MODE_IS_EXCLUDE		2
  #define IGMPV3_CHANGE_TO_INCLUDE	3
  #define IGMPV3_CHANGE_TO_EXCLUDE	4
  #define IGMPV3_ALLOW_NEW_SOURCES	5
  #define IGMPV3_BLOCK_OLD_SOURCES	6
  
  struct igmpv3_grec {
  	__u8	grec_type;
  	__u8	grec_auxwords;

  	__be16	grec_nsrcs;
  	__be32	grec_mca;
  	__be32	grec_src[0];

  };
  
  struct igmpv3_report {
  	__u8 type;
  	__u8 resv1;

  	__be16 csum;
  	__be16 resv2;
  	__be16 ngrec;

  	struct igmpv3_grec grec[0];
  };
  
  struct igmpv3_query {
  	__u8 type;
  	__u8 code;

  	__be16 csum;
  	__be32 group;

  #if defined(__LITTLE_ENDIAN_BITFIELD)
  	__u8 qrv:3,
  	     suppress:1,
  	     resv:4;
  #elif defined(__BIG_ENDIAN_BITFIELD)
  	__u8 resv:4,
  	     suppress:1,
  	     qrv:3;
  #else
  #error "Please fix <asm/byteorder.h>"
  #endif
  	__u8 qqic;

  	__be16 nsrcs;
  	__be32 srcs[0];

  };

  #ifdef __KERNEL__
  #include <linux/skbuff.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);

  }
  #endif

  #define IGMP_HOST_MEMBERSHIP_QUERY	0x11	/* From RFC1112 */
  #define IGMP_HOST_MEMBERSHIP_REPORT	0x12	/* Ditto */
  #define IGMP_DVMRP			0x13	/* DVMRP routing */
  #define IGMP_PIM			0x14	/* PIM routing */
  #define IGMP_TRACE			0x15
  #define IGMPV2_HOST_MEMBERSHIP_REPORT	0x16	/* V2 version of 0x11 */
  #define IGMP_HOST_LEAVE_MESSAGE 	0x17
  #define IGMPV3_HOST_MEMBERSHIP_REPORT	0x22	/* V3 version of 0x11 */
  
  #define IGMP_MTRACE_RESP		0x1e
  #define IGMP_MTRACE			0x1f
  
  
  /*
   *	Use the BSD names for these for compatibility
   */
  
  #define IGMP_DELAYING_MEMBER		0x01
  #define IGMP_IDLE_MEMBER		0x02
  #define IGMP_LAZY_MEMBER		0x03
  #define IGMP_SLEEPING_MEMBER		0x04
  #define IGMP_AWAKENING_MEMBER		0x05
  
  #define IGMP_MINLEN			8
  
  #define IGMP_MAX_HOST_REPORT_DELAY	10	/* max delay for response to */
  						/* query (in seconds)	*/
  
  #define IGMP_TIMER_SCALE		10	/* denotes that the igmphdr->timer field */
  						/* specifies time in 10th of seconds	 */
  
  #define IGMP_AGE_THRESHOLD		400	/* If this host don't hear any IGMP V1	*/
  						/* message in this period of time,	*/
  						/* revert to IGMP v2 router.		*/
  
  #define IGMP_ALL_HOSTS		htonl(0xE0000001L)
  #define IGMP_ALL_ROUTER 	htonl(0xE0000002L)
  #define IGMPV3_ALL_MCR	 	htonl(0xE0000016L)
  #define IGMP_LOCAL_GROUP	htonl(0xE0000000L)
  #define IGMP_LOCAL_GROUP_MASK	htonl(0xFFFFFF00L)
  
  /*
   * struct for keeping the multicast list in
   */
  
  #ifdef __KERNEL__
  #include <linux/skbuff.h>

  #include <linux/timer.h>

  #include <linux/in.h>

  extern int sysctl_igmp_max_memberships;
  extern int sysctl_igmp_max_msf;

  struct ip_sf_socklist
  {
  	unsigned int		sl_max;
  	unsigned int		sl_count;

  	__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	*next;

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

  	struct ip_sf_list	*sources;
  	struct ip_sf_list	*tomb;
  	unsigned int		sfmode;
  	unsigned long		sfcount[2];
  	struct ip_mc_list	*next;
  	struct timer_list	timer;
  	int			users;
  	atomic_t		refcnt;
  	spinlock_t		lock;
  	char			tm_running;
  	char			reporter;
  	char			unsolicit_count;
  	char			loaded;
  	unsigned char		gsquery;	/* check source marks? */
  	unsigned char		crcount;
  };
  
  /* 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(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 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);

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

  extern void ip_mc_rejoin_group(struct ip_mc_list *im);

  #endif
  #endif