include/net/mld.h

   1 #ifndef LINUX_MLD_H
   2 #define LINUX_MLD_H
   3
   4 #include <linux/in6.h>
   5 #include <linux/icmpv6.h>
   6
   7 /* MLDv1 Query/Report/Done */
   8 struct mld_msg {
   9         struct icmp6hdr         mld_hdr;
  10         struct in6_addr         mld_mca;
  11 };
  12
  13 #define mld_type                mld_hdr.icmp6_type
  14 #define mld_code                mld_hdr.icmp6_code
  15 #define mld_cksum               mld_hdr.icmp6_cksum
  16 #define mld_maxdelay            mld_hdr.icmp6_maxdelay
  17 #define mld_reserved            mld_hdr.icmp6_dataun.un_data16[1]
  18
  19 /* Multicast Listener Discovery version 2 headers */
  20 /* MLDv2 Report */
  21 struct mld2_grec {
  22         __u8            grec_type;
  23         __u8            grec_auxwords;
  24         __be16          grec_nsrcs;
  25         struct in6_addr grec_mca;
  26         struct in6_addr grec_src[0];
  27 };
  28
  29 struct mld2_report {
  30         struct icmp6hdr         mld2r_hdr;
  31         struct mld2_grec        mld2r_grec[0];
  32 };
  33
  34 #define mld2r_type              mld2r_hdr.icmp6_type
  35 #define mld2r_resv1             mld2r_hdr.icmp6_code
  36 #define mld2r_cksum             mld2r_hdr.icmp6_cksum
  37 #define mld2r_resv2             mld2r_hdr.icmp6_dataun.un_data16[0]
  38 #define mld2r_ngrec             mld2r_hdr.icmp6_dataun.un_data16[1]
  39
  40 /* MLDv2 Query */
  41 struct mld2_query {
  42         struct icmp6hdr         mld2q_hdr;
  43         struct in6_addr         mld2q_mca;
  44 #if defined(__LITTLE_ENDIAN_BITFIELD)
  45         __u8                    mld2q_qrv:3,
  46                                 mld2q_suppress:1,
  47                                 mld2q_resv2:4;
  48 #elif defined(__BIG_ENDIAN_BITFIELD)
  49         __u8                    mld2q_resv2:4,
  50                                 mld2q_suppress:1,
  51                                 mld2q_qrv:3;
  52 #else
  53 #error "Please fix <asm/byteorder.h>"
  54 #endif
  55         __u8                    mld2q_qqic;
  56         __be16                  mld2q_nsrcs;
  57         struct in6_addr         mld2q_srcs[0];
  58 };
  59
  60 #define mld2q_type              mld2q_hdr.icmp6_type
  61 #define mld2q_code              mld2q_hdr.icmp6_code
  62 #define mld2q_cksum             mld2q_hdr.icmp6_cksum
  63 #define mld2q_mrc               mld2q_hdr.icmp6_maxdelay
  64 #define mld2q_resv1             mld2q_hdr.icmp6_dataun.un_data16[1]
  65
  66 /* Max Response Code */
  67 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
  68 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
  69         ((value) < (thresh) ? (value) : \
  70         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
  71         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
  72
  73 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
  74
  75 #endif