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 /* RFC3810, 5.1.3. Maximum Response Code: 67 * 68 * If Maximum Response Code >= 32768, Maximum Response Code represents a 69 * floating-point value as follows: 70 * 71 * 0 1 2 3 4 5 6 7 8 9 A B C D E F 72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 73 * |1| exp | mant | 74 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 75 */ 76 #define MLDV2_MRC_EXP(value) (((value) >> 12) & 0x0007) 77 #define MLDV2_MRC_MAN(value) ((value) & 0x0fff) 78 79 /* RFC3810, 5.1.9. QQIC (Querier's Query Interval Code): 80 * 81 * If QQIC >= 128, QQIC represents a floating-point value as follows: 82 * 83 * 0 1 2 3 4 5 6 7 84 * +-+-+-+-+-+-+-+-+ 85 * |1| exp | mant | 86 * +-+-+-+-+-+-+-+-+ 87 */ 88 #define MLDV2_QQIC_EXP(value) (((value) >> 4) & 0x07) 89 #define MLDV2_QQIC_MAN(value) ((value) & 0x0f) 90 91 #define MLD_EXP_MIN_LIMIT 32768UL 92 #define MLDV1_MRD_MAX_COMPAT (MLD_EXP_MIN_LIMIT - 1) 93 94 static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2) 95 { 96 /* RFC3810, 5.1.3. Maximum Response Code */ 97 unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc); 98 99 if (mc_mrc < MLD_EXP_MIN_LIMIT) { 100 ret = mc_mrc; 101 } else { 102 unsigned long mc_man, mc_exp; 103 104 mc_exp = MLDV2_MRC_EXP(mc_mrc); 105 mc_man = MLDV2_MRC_MAN(mc_mrc); 106 107 ret = (mc_man | 0x1000) << (mc_exp + 3); 108 } 109 110 return ret; 111 } 112 113 #endif 114