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root/include/linux/igmp.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. igmp_hdr
  2. igmpv3_report_hdr
  3. igmpv3_query_hdr

/*
 *      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 <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];
};

#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>

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);
}

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_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

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