linux/include/linux/igmp.h
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   1/*
   2 *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3 *
   4 *      Authors:
   5 *              Alan Cox <alan@lxorguk.ukuu.org.uk>
   6 *
   7 *      Extended to talk the BSD extended IGMP protocol of mrouted 3.6
   8 *
   9 *
  10 *      This program is free software; you can redistribute it and/or
  11 *      modify it under the terms of the GNU General Public License
  12 *      as published by the Free Software Foundation; either version
  13 *      2 of the License, or (at your option) any later version.
  14 */
  15#ifndef _LINUX_IGMP_H
  16#define _LINUX_IGMP_H
  17
  18#include <linux/skbuff.h>
  19#include <linux/timer.h>
  20#include <linux/in.h>
  21#include <uapi/linux/igmp.h>
  22
  23static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
  24{
  25        return (struct igmphdr *)skb_transport_header(skb);
  26}
  27
  28static inline struct igmpv3_report *
  29                        igmpv3_report_hdr(const struct sk_buff *skb)
  30{
  31        return (struct igmpv3_report *)skb_transport_header(skb);
  32}
  33
  34static inline struct igmpv3_query *
  35                        igmpv3_query_hdr(const struct sk_buff *skb)
  36{
  37        return (struct igmpv3_query *)skb_transport_header(skb);
  38}
  39
  40extern int sysctl_igmp_max_memberships;
  41extern int sysctl_igmp_max_msf;
  42
  43struct ip_sf_socklist {
  44        unsigned int            sl_max;
  45        unsigned int            sl_count;
  46        struct rcu_head         rcu;
  47        __be32                  sl_addr[0];
  48};
  49
  50#define IP_SFLSIZE(count)       (sizeof(struct ip_sf_socklist) + \
  51        (count) * sizeof(__be32))
  52
  53#define IP_SFBLOCK      10      /* allocate this many at once */
  54
  55/* ip_mc_socklist is real list now. Speed is not argument;
  56   this list never used in fast path code
  57 */
  58
  59struct ip_mc_socklist {
  60        struct ip_mc_socklist __rcu *next_rcu;
  61        struct ip_mreqn         multi;
  62        unsigned int            sfmode;         /* MCAST_{INCLUDE,EXCLUDE} */
  63        struct ip_sf_socklist __rcu     *sflist;
  64        struct rcu_head         rcu;
  65};
  66
  67struct ip_sf_list {
  68        struct ip_sf_list       *sf_next;
  69        __be32                  sf_inaddr;
  70        unsigned long           sf_count[2];    /* include/exclude counts */
  71        unsigned char           sf_gsresp;      /* include in g & s response? */
  72        unsigned char           sf_oldin;       /* change state */
  73        unsigned char           sf_crcount;     /* retrans. left to send */
  74};
  75
  76struct ip_mc_list {
  77        struct in_device        *interface;
  78        __be32                  multiaddr;
  79        unsigned int            sfmode;
  80        struct ip_sf_list       *sources;
  81        struct ip_sf_list       *tomb;
  82        unsigned long           sfcount[2];
  83        union {
  84                struct ip_mc_list *next;
  85                struct ip_mc_list __rcu *next_rcu;
  86        };
  87        struct timer_list       timer;
  88        int                     users;
  89        atomic_t                refcnt;
  90        spinlock_t              lock;
  91        char                    tm_running;
  92        char                    reporter;
  93        char                    unsolicit_count;
  94        char                    loaded;
  95        unsigned char           gsquery;        /* check source marks? */
  96        unsigned char           crcount;
  97        struct rcu_head         rcu;
  98};
  99
 100/* V3 exponential field decoding */
 101#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 102#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
 103        ((value) < (thresh) ? (value) : \
 104        ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
 105         (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 106
 107#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
 108#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
 109
 110extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
 111extern int igmp_rcv(struct sk_buff *);
 112extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
 113extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
 114extern void ip_mc_drop_socket(struct sock *sk);
 115extern int ip_mc_source(int add, int omode, struct sock *sk,
 116                struct ip_mreq_source *mreqs, int ifindex);
 117extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
 118extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 119                struct ip_msfilter __user *optval, int __user *optlen);
 120extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
 121                struct group_filter __user *optval, int __user *optlen);
 122extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
 123extern void ip_mc_init_dev(struct in_device *);
 124extern void ip_mc_destroy_dev(struct in_device *);
 125extern void ip_mc_up(struct in_device *);
 126extern void ip_mc_down(struct in_device *);
 127extern void ip_mc_unmap(struct in_device *);
 128extern void ip_mc_remap(struct in_device *);
 129extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
 130extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
 131extern void ip_mc_rejoin_groups(struct in_device *in_dev);
 132
 133#endif
 134
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