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1 /* |
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2 * Linux NET3: Internet Group Management Protocol [IGMP] |
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3 * |
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4 * Authors: |
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5 * Alan Cox <alan@lxorguk.ukuu.org.uk> |
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6 * |
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7 * Extended to talk the BSD extended IGMP protocol of mrouted 3.6 |
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8 * |
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9 * |
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10 * This program is free software; you can redistribute it and/or |
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11 * modify it under the terms of the GNU General Public License |
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12 * as published by the Free Software Foundation; either version |
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13 * 2 of the License, or (at your option) any later version. |
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14 */ |
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15 |
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16 #ifndef _LINUX_IGMP_H |
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17 #define _LINUX_IGMP_H |
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18 |
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19 #include <asm/byteorder.h> |
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20 |
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21 /* |
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22 * IGMP protocol structures |
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23 */ |
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24 |
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25 /* |
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26 * Header in on cable format |
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27 */ |
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28 |
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29 struct igmphdr |
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30 { |
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31 __u8 type; |
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32 __u8 code; /* For newer IGMP */ |
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33 __sum16 csum; |
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34 __be32 group; |
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35 }; |
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36 |
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37 /* V3 group record types [grec_type] */ |
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38 #define IGMPV3_MODE_IS_INCLUDE 1 |
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39 #define IGMPV3_MODE_IS_EXCLUDE 2 |
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40 #define IGMPV3_CHANGE_TO_INCLUDE 3 |
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41 #define IGMPV3_CHANGE_TO_EXCLUDE 4 |
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42 #define IGMPV3_ALLOW_NEW_SOURCES 5 |
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43 #define IGMPV3_BLOCK_OLD_SOURCES 6 |
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44 |
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45 struct igmpv3_grec { |
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46 __u8 grec_type; |
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47 __u8 grec_auxwords; |
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48 __be16 grec_nsrcs; |
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49 __be32 grec_mca; |
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50 __be32 grec_src[0]; |
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51 }; |
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52 |
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53 struct igmpv3_report { |
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54 __u8 type; |
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55 __u8 resv1; |
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56 __be16 csum; |
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57 __be16 resv2; |
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58 __be16 ngrec; |
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59 struct igmpv3_grec grec[0]; |
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60 }; |
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61 |
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62 struct igmpv3_query { |
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63 __u8 type; |
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64 __u8 code; |
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65 __be16 csum; |
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66 __be32 group; |
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67 #if defined(__LITTLE_ENDIAN_BITFIELD) |
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68 __u8 qrv:3, |
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69 suppress:1, |
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70 resv:4; |
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71 #elif defined(__BIG_ENDIAN_BITFIELD) |
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72 __u8 resv:4, |
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73 suppress:1, |
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74 qrv:3; |
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75 #else |
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76 #error "Please fix <asm/byteorder.h>" |
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77 #endif |
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78 __u8 qqic; |
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79 __be16 nsrcs; |
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80 __be32 srcs[0]; |
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81 }; |
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82 |
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83 #define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */ |
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84 #define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */ |
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85 #define IGMP_DVMRP 0x13 /* DVMRP routing */ |
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86 #define IGMP_PIM 0x14 /* PIM routing */ |
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87 #define IGMP_TRACE 0x15 |
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88 #define IGMPV2_HOST_MEMBERSHIP_REPORT 0x16 /* V2 version of 0x11 */ |
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89 #define IGMP_HOST_LEAVE_MESSAGE 0x17 |
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90 #define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x11 */ |
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91 |
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92 #define IGMP_MTRACE_RESP 0x1e |
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93 #define IGMP_MTRACE 0x1f |
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94 |
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95 |
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96 /* |
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97 * Use the BSD names for these for compatibility |
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98 */ |
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99 |
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100 #define IGMP_DELAYING_MEMBER 0x01 |
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101 #define IGMP_IDLE_MEMBER 0x02 |
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102 #define IGMP_LAZY_MEMBER 0x03 |
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103 #define IGMP_SLEEPING_MEMBER 0x04 |
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104 #define IGMP_AWAKENING_MEMBER 0x05 |
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105 |
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106 #define IGMP_MINLEN 8 |
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107 |
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108 #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */ |
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109 /* query (in seconds) */ |
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110 |
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111 #define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */ |
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112 /* specifies time in 10th of seconds */ |
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113 |
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114 #define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */ |
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115 /* message in this period of time, */ |
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116 /* revert to IGMP v2 router. */ |
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117 |
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118 #define IGMP_ALL_HOSTS htonl(0xE0000001L) |
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119 #define IGMP_ALL_ROUTER htonl(0xE0000002L) |
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120 #define IGMPV3_ALL_MCR htonl(0xE0000016L) |
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121 #define IGMP_LOCAL_GROUP htonl(0xE0000000L) |
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122 #define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L) |
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123 |
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124 /* |
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125 * struct for keeping the multicast list in |
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126 */ |
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127 |
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128 #ifdef __KERNEL__ |
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129 #include <linux/skbuff.h> |
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130 #include <linux/timer.h> |
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131 #include <linux/in.h> |
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132 |
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133 static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) |
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134 { |
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135 return (struct igmphdr *)skb_transport_header(skb); |
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136 } |
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137 |
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138 static inline struct igmpv3_report * |
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139 igmpv3_report_hdr(const struct sk_buff *skb) |
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140 { |
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141 return (struct igmpv3_report *)skb_transport_header(skb); |
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142 } |
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143 |
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144 static inline struct igmpv3_query * |
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145 igmpv3_query_hdr(const struct sk_buff *skb) |
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146 { |
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147 return (struct igmpv3_query *)skb_transport_header(skb); |
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148 } |
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149 |
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150 extern int sysctl_igmp_max_memberships; |
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151 extern int sysctl_igmp_max_msf; |
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152 |
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153 struct ip_sf_socklist |
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154 { |
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155 unsigned int sl_max; |
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156 unsigned int sl_count; |
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157 __be32 sl_addr[0]; |
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158 }; |
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159 |
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160 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ |
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161 (count) * sizeof(__be32)) |
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162 |
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163 #define IP_SFBLOCK 10 /* allocate this many at once */ |
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164 |
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165 /* ip_mc_socklist is real list now. Speed is not argument; |
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166 this list never used in fast path code |
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167 */ |
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168 |
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169 struct ip_mc_socklist |
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170 { |
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171 struct ip_mc_socklist *next; |
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172 struct ip_mreqn multi; |
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173 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ |
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174 struct ip_sf_socklist *sflist; |
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175 }; |
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176 |
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177 struct ip_sf_list |
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178 { |
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179 struct ip_sf_list *sf_next; |
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180 __be32 sf_inaddr; |
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181 unsigned long sf_count[2]; /* include/exclude counts */ |
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182 unsigned char sf_gsresp; /* include in g & s response? */ |
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183 unsigned char sf_oldin; /* change state */ |
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184 unsigned char sf_crcount; /* retrans. left to send */ |
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185 }; |
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186 |
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187 struct ip_mc_list |
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188 { |
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189 struct in_device *interface; |
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190 __be32 multiaddr; |
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191 struct ip_sf_list *sources; |
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192 struct ip_sf_list *tomb; |
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193 unsigned int sfmode; |
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194 unsigned long sfcount[2]; |
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195 struct ip_mc_list *next; |
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196 struct timer_list timer; |
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197 int users; |
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198 atomic_t refcnt; |
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199 spinlock_t lock; |
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200 char tm_running; |
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201 char reporter; |
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202 char unsolicit_count; |
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203 char loaded; |
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204 unsigned char gsquery; /* check source marks? */ |
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205 unsigned char crcount; |
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206 }; |
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207 |
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208 /* V3 exponential field decoding */ |
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209 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) |
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210 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ |
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211 ((value) < (thresh) ? (value) : \ |
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212 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ |
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213 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) |
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214 |
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215 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) |
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216 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) |
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217 |
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218 extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto); |
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219 extern int igmp_rcv(struct sk_buff *); |
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220 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); |
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221 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); |
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222 extern void ip_mc_drop_socket(struct sock *sk); |
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223 extern int ip_mc_source(int add, int omode, struct sock *sk, |
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224 struct ip_mreq_source *mreqs, int ifindex); |
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225 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); |
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226 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, |
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227 struct ip_msfilter __user *optval, int __user *optlen); |
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228 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, |
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229 struct group_filter __user *optval, int __user *optlen); |
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230 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif); |
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231 extern void ip_mc_init_dev(struct in_device *); |
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232 extern void ip_mc_destroy_dev(struct in_device *); |
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233 extern void ip_mc_up(struct in_device *); |
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234 extern void ip_mc_down(struct in_device *); |
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235 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr); |
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236 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); |
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237 extern void ip_mc_rejoin_group(struct ip_mc_list *im); |
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238 |
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239 #endif |
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240 #endif |