include/linux/igmp.h

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      Authors:
   5  *              Alan Cox <Alan.Cox@linux.org>
   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 <asm/byteorder.h>
  20
  21 /*
  22  *      IGMP protocol structures
  23  */
  24
  25 /*
  26  *      Header in on cable format
  27  */
  28
  29 struct igmphdr
  30 {
  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
  45 struct 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
  53 struct 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
  62 struct 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 0x11 */
  89 #define IGMP_HOST_LEAVE_MESSAGE         0x17
  90 #define IGMPV3_HOST_MEMBERSHIP_REPORT   0x22    /* V3 version of 0x11 */
  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
 133 static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
 134 {
 135         return (struct igmphdr *)skb_transport_header(skb);
 136 }
 137
 138 static 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
 144 static 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
 150 extern int sysctl_igmp_max_memberships;
 151 extern int sysctl_igmp_max_msf;
 152
 153 struct ip_sf_socklist
 154 {
 155         unsigned int            sl_max;
 156         unsigned int            sl_count;
 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
 169 struct ip_mc_socklist
 170 {
 171         struct ip_mc_socklist   *next;
 172         struct ip_mreqn         multi;
 173         unsigned int            sfmode;         /* MCAST_{INCLUDE,EXCLUDE} */
 174         struct ip_sf_socklist   *sflist;
 175 };
 176
 177 struct ip_sf_list
 178 {
 179         struct ip_sf_list       *sf_next;
 180         __be32                  sf_inaddr;
 181         unsigned long           sf_count[2];    /* include/exclude counts */
 182         unsigned char           sf_gsresp;      /* include in g & s response? */
 183         unsigned char           sf_oldin;       /* change state */
 184         unsigned char           sf_crcount;     /* retrans. left to send */
 185 };
 186
 187 struct ip_mc_list
 188 {
 189         struct in_device        *interface;
 190         __be32                  multiaddr;
 191         struct ip_sf_list       *sources;
 192         struct ip_sf_list       *tomb;
 193         unsigned int            sfmode;
 194         unsigned long           sfcount[2];
 195         struct ip_mc_list       *next;
 196         struct timer_list       timer;
 197         int                     users;
 198         atomic_t                refcnt;
 199         spinlock_t              lock;
 200         char                    tm_running;
 201         char                    reporter;
 202         char                    unsolicit_count;
 203         char                    loaded;
 204         unsigned char           gsquery;        /* check source marks? */
 205         unsigned char           crcount;
 206 };
 207
 208 /* V3 exponential field decoding */
 209 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 210 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
 211         ((value) < (thresh) ? (value) : \
 212         ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
 213          (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 214
 215 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
 216 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
 217
 218 extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
 219 extern int igmp_rcv(struct sk_buff *);
 220 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
 221 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
 222 extern void ip_mc_drop_socket(struct sock *sk);
 223 extern int ip_mc_source(int add, int omode, struct sock *sk,
 224                 struct ip_mreq_source *mreqs, int ifindex);
 225 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
 226 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 227                 struct ip_msfilter __user *optval, int __user *optlen);
 228 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
 229                 struct group_filter __user *optval, int __user *optlen);
 230 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
 231 extern void ip_mc_init_dev(struct in_device *);
 232 extern void ip_mc_destroy_dev(struct in_device *);
 233 extern void ip_mc_up(struct in_device *);
 234 extern void ip_mc_down(struct in_device *);
 235 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
 236 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
 237 extern void ip_mc_rejoin_group(struct ip_mc_list *im);
 238
 239 #endif
 240 #endif