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/*

 *      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