igmp.h

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/*
 *  Linux NET3: Internet Group Management Protocol  [IGMP]
 *
 *  Authors:
 *      Alan Cox <[email protected]>
 *
 *  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 <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/in.h>
#include <uapi/linux/igmp.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;
    struct rcu_head     rcu;
    __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 __rcu *next_rcu;
    struct ip_mreqn     multi;
    unsigned int        sfmode;     /* MCAST_{INCLUDE,EXCLUDE} */
    struct ip_sf_socklist __rcu *sflist;
    struct rcu_head     rcu;
};

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;
    unsigned int        sfmode;
    struct ip_sf_list   *sources;
    struct ip_sf_list   *tomb;
    unsigned long       sfcount[2];
    union {
        struct ip_mc_list *next;
        struct ip_mc_list __rcu *next_rcu;
    };
    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;
    struct rcu_head     rcu;
};

/* 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_rcu(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_unmap(struct in_device *);
extern void ip_mc_remap(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_groups(struct in_device *in_dev);

#endif