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
  24 static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
  25 {
  26         return (struct igmphdr *)skb_transport_header(skb);
  27 }
  28
  29 static 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
  35 static 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
  41 struct 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
  57 struct 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
  65 struct 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
  74 struct 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
 109 extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto);
 110 extern int igmp_rcv(struct sk_buff *);
 111 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
 112 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
 113 extern void ip_mc_drop_socket(struct sock *sk);
 114 extern int ip_mc_source(int add, int omode, struct sock *sk,
 115                 struct ip_mreq_source *mreqs, int ifindex);
 116 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
 117 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 118                 struct ip_msfilter __user *optval, int __user *optlen);
 119 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
 120                 struct group_filter __user *optval, int __user *optlen);
 121 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt,
 122                           int dif, int sdif);
 123 extern void ip_mc_init_dev(struct in_device *);
 124 extern void ip_mc_destroy_dev(struct in_device *);
 125 extern void ip_mc_up(struct in_device *);
 126 extern void ip_mc_down(struct in_device *);
 127 extern void ip_mc_unmap(struct in_device *);
 128 extern void ip_mc_remap(struct in_device *);
 129 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
 130 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
 131 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 132
 133 #endif