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 /*
  20  *      IGMP protocol structures
  21  */
  22
  23 /*
  24  *      Header in on cable format
  25  */
  26
  27 struct igmphdr
  28 {
  29         __u8 type;
  30         __u8 code;              /* For newer IGMP */
  31         __u16 csum;
  32         __u32 group;
  33 };
  34
  35 #define IGMP_HOST_MEMBERSHIP_QUERY      0x11    /* From RFC1112 */
  36 #define IGMP_HOST_MEMBERSHIP_REPORT     0x12    /* Ditto */
  37 #define IGMP_DVMRP                      0x13    /* DVMRP routing */
  38 #define IGMP_PIM                        0x14    /* PIM routing */
  39 #define IGMP_TRACE                      0x15
  40 #define IGMP_HOST_NEW_MEMBERSHIP_REPORT 0x16    /* New version of 0x11 */
  41 #define IGMP_HOST_LEAVE_MESSAGE         0x17    /* An extra BSD seems to send */
  42
  43 #define IGMP_MTRACE_RESP                0x1e
  44 #define IGMP_MTRACE                     0x1f
  45
  46
  47 /*
  48  *      Use the BSD names for these for compatibility
  49  */
  50
  51 #define IGMP_DELAYING_MEMBER            0x01
  52 #define IGMP_IDLE_MEMBER                0x02
  53 #define IGMP_LAZY_MEMBER                0x03
  54 #define IGMP_SLEEPING_MEMBER            0x04
  55 #define IGMP_AWAKENING_MEMBER           0x05
  56
  57 #define IGMP_OLD_ROUTER                 0x00
  58 #define IGMP_NEW_ROUTER                 0x01
  59
  60 #define IGMP_MINLEN                     8
  61
  62 #define IGMP_MAX_HOST_REPORT_DELAY      10      /* max delay for response to */
  63                                                 /* query (in seconds)   */
  64
  65 #define IGMP_TIMER_SCALE                10      /* denotes that the igmphdr->timer field */
  66                                                 /* specifies time in 10th of seconds     */
  67
  68 #define IGMP_AGE_THRESHOLD              540     /* If this host don't hear any IGMP V1  */
  69                                                 /* message in this period of time,      */
  70                                                 /* revert to IGMP v2 router.            */
  71
  72 #define IGMP_ALL_HOSTS          htonl(0xE0000001L)
  73 #define IGMP_ALL_ROUTER         htonl(0xE0000002L)
  74 #define IGMP_LOCAL_GROUP        htonl(0xE0000000L)
  75 #define IGMP_LOCAL_GROUP_MASK   htonl(0xFFFFFF00L)
  76
  77 /*
  78  * struct for keeping the multicast list in
  79  */
  80
  81 #ifdef __KERNEL__
  82 struct ip_mc_socklist
  83 {
  84         unsigned long multiaddr[IP_MAX_MEMBERSHIPS];    /* This is a speed trade off */
  85         struct device *multidev[IP_MAX_MEMBERSHIPS];
  86 };
  87
  88 struct ip_mc_list
  89 {
  90         struct device *interface;
  91         unsigned long multiaddr;
  92         struct ip_mc_list *next;
  93         struct timer_list timer;
  94         int users;
  95         char tm_running;
  96         char reporter;
  97 };
  98
  99 struct ip_router_info
 100 {
 101         struct device *dev;
 102         int    type;    /* type of router which is querier on this interface */
 103         int    time;    /* # of slow timeouts since last old query */
 104         struct timer_list timer;
 105         struct ip_router_info *next;
 106 };
 107
 108 extern struct ip_mc_list *ip_mc_head;
 109
 110
 111 extern int igmp_rcv(struct sk_buff *, unsigned short);
 112 extern void ip_mc_drop_device(struct device *dev);
 113 extern int ip_mc_join_group(struct sock *sk, struct device *dev, unsigned long addr);
 114 extern int ip_mc_leave_group(struct sock *sk, struct device *dev,unsigned long addr);
 115 extern void ip_mc_drop_socket(struct sock *sk);
 116 extern void ip_mr_init(void);
 117 #endif
 118 #endif