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