LXR linux/include/linux/igmp.h

   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 <linux/refcount.h>
  22#include <uapi/linux/igmp.h>
  23
  24static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
  25{
  26        return (struct igmphdr *)skb_transport_header(skb);
  27}
  28
  29static inline struct igmpv3_report *
  30                        igmpv3_report_hdr(const struct sk_buff *skb)
  31{
  32        return (struct igmpv3_report *)skb_transport_header(skb);
  33}
  34
  35static inline struct igmpv3_query *
  36                        igmpv3_query_hdr(const struct sk_buff *skb)
  37{
  38        return (struct igmpv3_query *)skb_transport_header(skb);
  39}
  40
  41struct ip_sf_socklist {
  42        unsigned int            sl_max;
  43        unsigned int            sl_count;
  44        struct rcu_head         rcu;
  45        __be32                  sl_addr[0];
  46};
  47
  48#define IP_SFLSIZE(count)       (sizeof(struct ip_sf_socklist) + \
  49        (count) * sizeof(__be32))
  50
  51#define IP_SFBLOCK      10      /* allocate this many at once */
  52
  53/* ip_mc_socklist is real list now. Speed is not argument;
  54   this list never used in fast path code
  55 */
  56
  57struct ip_mc_socklist {
  58        struct ip_mc_socklist __rcu *next_rcu;
  59        struct ip_mreqn         multi;
  60        unsigned int            sfmode;         /* MCAST_{INCLUDE,EXCLUDE} */
  61        struct ip_sf_socklist __rcu     *sflist;
  62        struct rcu_head         rcu;
  63};
  64
  65struct ip_sf_list {
  66        struct ip_sf_list       *sf_next;
  67        __be32                  sf_inaddr;
  68        unsigned long           sf_count[2];    /* include/exclude counts */
  69        unsigned char           sf_gsresp;      /* include in g & s response? */
  70        unsigned char           sf_oldin;       /* change state */
  71        unsigned char           sf_crcount;     /* retrans. left to send */
  72};
  73
  74struct ip_mc_list {
  75        struct in_device        *interface;
  76        __be32                  multiaddr;
  77        unsigned int            sfmode;
  78        struct ip_sf_list       *sources;
  79        struct ip_sf_list       *tomb;
  80        unsigned long           sfcount[2];
  81        union {
  82                struct ip_mc_list *next;
  83                struct ip_mc_list __rcu *next_rcu;
  84        };
  85        struct ip_mc_list __rcu *next_hash;
  86        struct timer_list       timer;
  87        int                     users;
  88        refcount_t              refcnt;
  89        spinlock_t              lock;
  90        char                    tm_running;
  91        char                    reporter;
  92        char                    unsolicit_count;
  93        char                    loaded;
  94        unsigned char           gsquery;        /* check source marks? */
  95        unsigned char           crcount;
  96        struct rcu_head         rcu;
  97};
  98
  99/* V3 exponential field decoding */
 100#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 101#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
 102        ((value) < (thresh) ? (value) : \
 103        ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
 104         (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 105
 106#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
 107#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
 108
 109extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto);
 110extern int igmp_rcv(struct sk_buff *);
 111extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
 112extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
 113extern void ip_mc_drop_socket(struct sock *sk);
 114extern int ip_mc_source(int add, int omode, struct sock *sk,
 115                struct ip_mreq_source *mreqs, int ifindex);
 116extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
 117extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 118                struct ip_msfilter __user *optval, int __user *optlen);
 119extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
 120                struct group_filter __user *optval, int __user *optlen);
 121extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt,
 122                          int dif, int sdif);
 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);
 131int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 132
 133#endif
 134