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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
#define IGMP_HOST_NEW_MEMBERSHIP_REPORT 0x16 /* New version of 0x11 */
#define IGMP_HOST_LEAVE_MESSAGE 0x17
#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 IGMP_LOCAL_GROUP htonl(0xE0000000L)
#define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L)
/*
* struct for keeping the multicast list in
*/
#ifdef __KERNEL__
/* 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;
int count;
struct ip_mreqn multi;
};
struct ip_mc_list
{
struct in_device *interface;
unsigned long multiaddr;
struct ip_mc_list *next;
struct timer_list timer;
int users;
char tm_running;
char reporter;
char unsolicit_count;
char loaded;
};
extern __inline__ int ip_check_mc(struct device *dev, u32 mc_addr)
{
struct in_device *in_dev = dev->ip_ptr;
struct ip_mc_list *im;
if (in_dev) {
for (im=in_dev->mc_list; im; im=im->next)
if (im->multiaddr == mc_addr)
return 1;
}
return 0;
}
extern int igmp_rcv(struct sk_buff *, unsigned short);
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 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 int ip_mc_dec_group(struct in_device *in_dev, u32 addr);
extern void ip_mc_inc_group(struct in_device *in_dev, u32 addr);
#endif
#endif
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