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
  16#ifndef _LINUX_IGMP_H
  17#define _LINUX_IGMP_H
  18
  19#include <linux/types.h>
  20#include <asm/byteorder.h>
  21
  22/*
  23 *      IGMP protocol structures
  24 */
  25
  26/*
  27 *      Header in on cable format
  28 */
  29
  30struct igmphdr {
  31        __u8 type;
  32        __u8 code;              /* For newer IGMP */
  33        __sum16 csum;
  34        __be32 group;
  35};
  36
  37/* V3 group record types [grec_type] */
  38#define IGMPV3_MODE_IS_INCLUDE          1
  39#define IGMPV3_MODE_IS_EXCLUDE          2
  40#define IGMPV3_CHANGE_TO_INCLUDE        3
  41#define IGMPV3_CHANGE_TO_EXCLUDE        4
  42#define IGMPV3_ALLOW_NEW_SOURCES        5
  43#define IGMPV3_BLOCK_OLD_SOURCES        6
  44
  45struct igmpv3_grec {
  46        __u8    grec_type;
  47        __u8    grec_auxwords;
  48        __be16  grec_nsrcs;
  49        __be32  grec_mca;
  50        __be32  grec_src[0];
  51};
  52
  53struct igmpv3_report {
  54        __u8 type;
  55        __u8 resv1;
  56        __be16 csum;
  57        __be16 resv2;
  58        __be16 ngrec;
  59        struct igmpv3_grec grec[0];
  60};
  61
  62struct igmpv3_query {
  63        __u8 type;
  64        __u8 code;
  65        __be16 csum;
  66        __be32 group;
  67#if defined(__LITTLE_ENDIAN_BITFIELD)
  68        __u8 qrv:3,
  69             suppress:1,
  70             resv:4;
  71#elif defined(__BIG_ENDIAN_BITFIELD)
  72        __u8 resv:4,
  73             suppress:1,
  74             qrv:3;
  75#else
  76#error "Please fix <asm/byteorder.h>"
  77#endif
  78        __u8 qqic;
  79        __be16 nsrcs;
  80        __be32 srcs[0];
  81};
  82
  83#define IGMP_HOST_MEMBERSHIP_QUERY      0x11    /* From RFC1112 */
  84#define IGMP_HOST_MEMBERSHIP_REPORT     0x12    /* Ditto */
  85#define IGMP_DVMRP                      0x13    /* DVMRP routing */
  86#define IGMP_PIM                        0x14    /* PIM routing */
  87#define IGMP_TRACE                      0x15
  88#define IGMPV2_HOST_MEMBERSHIP_REPORT   0x16    /* V2 version of 0x12 */
  89#define IGMP_HOST_LEAVE_MESSAGE         0x17
  90#define IGMPV3_HOST_MEMBERSHIP_REPORT   0x22    /* V3 version of 0x12 */
  91
  92#define IGMP_MTRACE_RESP                0x1e
  93#define IGMP_MTRACE                     0x1f
  94
  95
  96/*
  97 *      Use the BSD names for these for compatibility
  98 */
  99
 100#define IGMP_DELAYING_MEMBER            0x01
 101#define IGMP_IDLE_MEMBER                0x02
 102#define IGMP_LAZY_MEMBER                0x03
 103#define IGMP_SLEEPING_MEMBER            0x04
 104#define IGMP_AWAKENING_MEMBER           0x05
 105
 106#define IGMP_MINLEN                     8
 107
 108#define IGMP_MAX_HOST_REPORT_DELAY      10      /* max delay for response to */
 109                                                /* query (in seconds)   */
 110
 111#define IGMP_TIMER_SCALE                10      /* denotes that the igmphdr->timer field */
 112                                                /* specifies time in 10th of seconds     */
 113
 114#define IGMP_AGE_THRESHOLD              400     /* If this host don't hear any IGMP V1  */
 115                                                /* message in this period of time,      */
 116                                                /* revert to IGMP v2 router.            */
 117
 118#define IGMP_ALL_HOSTS          htonl(0xE0000001L)
 119#define IGMP_ALL_ROUTER         htonl(0xE0000002L)
 120#define IGMPV3_ALL_MCR          htonl(0xE0000016L)
 121#define IGMP_LOCAL_GROUP        htonl(0xE0000000L)
 122#define IGMP_LOCAL_GROUP_MASK   htonl(0xFFFFFF00L)
 123
 124/*
 125 * struct for keeping the multicast list in
 126 */
 127
 128#ifdef __KERNEL__
 129#include <linux/skbuff.h>
 130#include <linux/timer.h>
 131#include <linux/in.h>
 132
 133static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
 134{
 135        return (struct igmphdr *)skb_transport_header(skb);
 136}
 137
 138static inline struct igmpv3_report *
 139                        igmpv3_report_hdr(const struct sk_buff *skb)
 140{
 141        return (struct igmpv3_report *)skb_transport_header(skb);
 142}
 143
 144static inline struct igmpv3_query *
 145                        igmpv3_query_hdr(const struct sk_buff *skb)
 146{
 147        return (struct igmpv3_query *)skb_transport_header(skb);
 148}
 149
 150extern int sysctl_igmp_max_memberships;
 151extern int sysctl_igmp_max_msf;
 152
 153struct ip_sf_socklist {
 154        unsigned int            sl_max;
 155        unsigned int            sl_count;
 156        struct rcu_head         rcu;
 157        __be32                  sl_addr[0];
 158};
 159
 160#define IP_SFLSIZE(count)       (sizeof(struct ip_sf_socklist) + \
 161        (count) * sizeof(__be32))
 162
 163#define IP_SFBLOCK      10      /* allocate this many at once */
 164
 165/* ip_mc_socklist is real list now. Speed is not argument;
 166   this list never used in fast path code
 167 */
 168
 169struct ip_mc_socklist {
 170        struct ip_mc_socklist __rcu *next_rcu;
 171        struct ip_mreqn         multi;
 172        unsigned int            sfmode;         /* MCAST_{INCLUDE,EXCLUDE} */
 173        struct ip_sf_socklist __rcu     *sflist;
 174        struct rcu_head         rcu;
 175};
 176
 177struct ip_sf_list {
 178        struct ip_sf_list       *sf_next;
 179        __be32                  sf_inaddr;
 180        unsigned long           sf_count[2];    /* include/exclude counts */
 181        unsigned char           sf_gsresp;      /* include in g & s response? */
 182        unsigned char           sf_oldin;       /* change state */
 183        unsigned char           sf_crcount;     /* retrans. left to send */
 184};
 185
 186struct ip_mc_list {
 187        struct in_device        *interface;
 188        __be32                  multiaddr;
 189        unsigned int            sfmode;
 190        struct ip_sf_list       *sources;
 191        struct ip_sf_list       *tomb;
 192        unsigned long           sfcount[2];
 193        union {
 194                struct ip_mc_list *next;
 195                struct ip_mc_list __rcu *next_rcu;
 196        };
 197        struct timer_list       timer;
 198        int                     users;
 199        atomic_t                refcnt;
 200        spinlock_t              lock;
 201        char                    tm_running;
 202        char                    reporter;
 203        char                    unsolicit_count;
 204        char                    loaded;
 205        unsigned char           gsquery;        /* check source marks? */
 206        unsigned char           crcount;
 207        struct rcu_head         rcu;
 208};
 209
 210/* V3 exponential field decoding */
 211#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 212#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
 213        ((value) < (thresh) ? (value) : \
 214        ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
 215         (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 216
 217#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
 218#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
 219
 220extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
 221extern int igmp_rcv(struct sk_buff *);
 222extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
 223extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
 224extern void ip_mc_drop_socket(struct sock *sk);
 225extern int ip_mc_source(int add, int omode, struct sock *sk,
 226                struct ip_mreq_source *mreqs, int ifindex);
 227extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
 228extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 229                struct ip_msfilter __user *optval, int __user *optlen);
 230extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
 231                struct group_filter __user *optval, int __user *optlen);
 232extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
 233extern void ip_mc_init_dev(struct in_device *);
 234extern void ip_mc_destroy_dev(struct in_device *);
 235extern void ip_mc_up(struct in_device *);
 236extern void ip_mc_down(struct in_device *);
 237extern void ip_mc_unmap(struct in_device *);
 238extern void ip_mc_remap(struct in_device *);
 239extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
 240extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
 241extern void ip_mc_rejoin_groups(struct in_device *in_dev);
 242
 243#endif
 244#endif
 245
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