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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

/*

 *      IGMP protocol structures

 */

/*

 *      Header in on cable format

 */

struct igmphdr

{

        __u8 type;

        __u8 code;              /* For newer IGMP */

        __u16 csum;

        __u32 group;

};

#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    /* CISCO trace */

#define IGMP_HOST_NEW_MEMBERSHIP_REPORT 0x16    /* New version of 0x11 */

#define IGMP_HOST_LEAVE_MESSAGE         0x17    /* An extra BSD seems to send */

#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_OLD_ROUTER                 0x00

#define IGMP_NEW_ROUTER                 0x01

#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              540     /* 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 IGMP_LOCAL_GROUP        htonl(0xE0000000L)

#define IGMP_LOCAL_GROUP_MASK   htonl(0xFFFFFF00L)

/*

 * struct for keeping the multicast list in

 */

#ifdef __KERNEL__

struct ip_mc_socklist

{

        unsigned long multiaddr[IP_MAX_MEMBERSHIPS];    /* This is a speed trade off */

        struct device *multidev[IP_MAX_MEMBERSHIPS];

};

struct ip_mc_list

{

        struct device *interface;

        unsigned long multiaddr;

        struct ip_mc_list *next;

        struct timer_list timer;

        short tm_running;

        short reporter;

        int users;

};

struct ip_router_info

{

        struct device *dev;

        int    type;    /* type of router which is querier on this interface */

        int    time;    /* # of slow timeouts since last old query */

        struct timer_list timer;

        struct ip_router_info *next;

};

extern struct ip_mc_list *ip_mc_head;

extern int igmp_rcv(struct sk_buff *, struct device *, struct options *, __u32, unsigned short,

        __u32, int , struct inet_protocol *);

extern void ip_mc_drop_device(struct device *dev);

extern int ip_mc_join_group(struct sock *sk, struct device *dev, unsigned long addr);

extern int ip_mc_leave_group(struct sock *sk, struct device *dev,unsigned long addr);

extern void ip_mc_drop_socket(struct sock *sk);

extern void ip_mr_init(void);

#endif

#endif