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annotate packages/net/tcpip/current/src/sys/netinet/igmp.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents ced4577552cd
children 74dbf4c3f2e1
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1 //==========================================================================
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2 //
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3 // sys/netinet/igmp.c
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4 //
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5 //
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6 //
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7 //==========================================================================
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8 //####BSDCOPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 //
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12 // Portions of this software may have been derived from OpenBSD or other sources,
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13 // and are covered by the appropriate copyright disclaimers included herein.
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14 //
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15 // -------------------------------------------
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16 //
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17 //####BSDCOPYRIGHTEND####
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18 //==========================================================================
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19 //#####DESCRIPTIONBEGIN####
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20 //
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21 // Author(s): gthomas
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22 // Contributors: gthomas
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23 // Date: 2000-01-10
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24 // Purpose:
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25 // Description:
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26 //
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27 //
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28 //####DESCRIPTIONEND####
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29 //
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30 //==========================================================================
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31
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32
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33 /* $OpenBSD: igmp.c,v 1.6 1999/12/08 06:50:19 itojun Exp $ */
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34 /* $NetBSD: igmp.c,v 1.15 1996/02/13 23:41:25 christos Exp $ */
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35
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36 /*
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37 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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38 * All rights reserved.
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39 *
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40 * Redistribution and use in source and binary forms, with or without
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41 * modification, are permitted provided that the following conditions
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42 * are met:
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43 * 1. Redistributions of source code must retain the above copyright
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44 * notice, this list of conditions and the following disclaimer.
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45 * 2. Redistributions in binary form must reproduce the above copyright
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46 * notice, this list of conditions and the following disclaimer in the
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47 * documentation and/or other materials provided with the distribution.
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48 * 3. Neither the name of the project nor the names of its contributors
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49 * may be used to endorse or promote products derived from this software
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50 * without specific prior written permission.
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51 *
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52 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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55 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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62 * SUCH DAMAGE.
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63 */
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64
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65 /*
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66 * Internet Group Management Protocol (IGMP) routines.
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67 *
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68 * Written by Steve Deering, Stanford, May 1988.
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69 * Modified by Rosen Sharma, Stanford, Aug 1994.
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70 * Modified by Bill Fenner, Xerox PARC, Feb 1995.
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71 *
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72 * MULTICAST Revision: 1.3
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73 */
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74
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75 #include <sys/param.h>
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76 #include <sys/mbuf.h>
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77 #include <sys/socket.h>
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78 #include <sys/protosw.h>
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79 #ifndef __ECOS
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80 #include <sys/systm.h>
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81 #endif
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82
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83 #include <net/if.h>
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84 #include <net/route.h>
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85
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86 #include <netinet/in.h>
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87 #include <netinet/in_var.h>
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88 #include <netinet/in_systm.h>
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89 #include <netinet/ip.h>
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90 #include <netinet/ip_var.h>
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91 #include <netinet/igmp.h>
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92 #include <netinet/igmp_var.h>
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93 #ifndef __ECOS
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94 #include <dev/rndvar.h>
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95 #endif
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96
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97 #include <machine/stdarg.h>
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98
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99 #define IP_MULTICASTOPTS 0
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100
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101 int igmp_timers_are_running;
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102 static struct router_info *rti_head;
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103
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104 void igmp_sendpkt __P((struct in_multi *, int));
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105 static int rti_fill __P((struct in_multi *));
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106 static struct router_info * rti_find __P((struct ifnet *));
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107
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108 void
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109 igmp_init()
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110 {
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111
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112 /*
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113 * To avoid byte-swapping the same value over and over again.
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114 */
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115 igmp_timers_are_running = 0;
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116 rti_head = 0;
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117 }
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118
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119 static int
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120 rti_fill(inm)
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121 struct in_multi *inm;
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122 {
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123 register struct router_info *rti;
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124
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125 for (rti = rti_head; rti != 0; rti = rti->rti_next) {
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126 if (rti->rti_ifp == inm->inm_ifp) {
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127 inm->inm_rti = rti;
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128 if (rti->rti_type == IGMP_v1_ROUTER)
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129 return (IGMP_v1_HOST_MEMBERSHIP_REPORT);
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130 else
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131 return (IGMP_v2_HOST_MEMBERSHIP_REPORT);
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132 }
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133 }
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134
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135 rti = (struct router_info *)malloc(sizeof(struct router_info),
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136 M_MRTABLE, M_NOWAIT);
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137 rti->rti_ifp = inm->inm_ifp;
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138 rti->rti_type = IGMP_v2_ROUTER;
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139 rti->rti_next = rti_head;
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140 rti_head = rti;
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141 inm->inm_rti = rti;
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142 return (IGMP_v2_HOST_MEMBERSHIP_REPORT);
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143 }
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144
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145 static struct router_info *
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146 rti_find(ifp)
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147 struct ifnet *ifp;
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148 {
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149 register struct router_info *rti;
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150
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151 for (rti = rti_head; rti != 0; rti = rti->rti_next) {
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152 if (rti->rti_ifp == ifp)
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153 return (rti);
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154 }
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155
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156 rti = (struct router_info *)malloc(sizeof(struct router_info),
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157 M_MRTABLE, M_NOWAIT);
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158 rti->rti_ifp = ifp;
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159 rti->rti_type = IGMP_v2_ROUTER;
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160 rti->rti_next = rti_head;
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161 rti_head = rti;
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162 return (rti);
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163 }
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164
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165 void
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166 rti_delete(ifp)
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167 struct ifnet *ifp;
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168 {
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169 struct router_info *rti, **prti = &rti_head;
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170
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171 for (rti = rti_head; rti != 0; rti = rti->rti_next) {
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172 if (rti->rti_ifp == ifp) {
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173 *prti = rti->rti_next;
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174 free(rti, M_MRTABLE);
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175 break;
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176 }
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177 prti = &rti->rti_next;
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178 }
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179 }
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180
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181 void
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182 #if __STDC__
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183 igmp_input(struct mbuf *m, ...)
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184 #else
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185 igmp_input(m, va_alist)
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186 struct mbuf *m;
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187 va_dcl
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188 #endif
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189 {
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190 int proto;
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191 register int iphlen;
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192 register struct ifnet *ifp = m->m_pkthdr.rcvif;
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193 register struct ip *ip = mtod(m, struct ip *);
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194 register struct igmp *igmp;
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195 register int igmplen;
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196 register int minlen;
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197 struct in_multi *inm;
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198 struct in_multistep step;
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199 struct router_info *rti;
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200 register struct in_ifaddr *ia;
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201 int timer;
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202 va_list ap;
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203
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204 va_start(ap, m);
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205 iphlen = va_arg(ap, int);
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206 proto = va_arg(ap, int);
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207 va_end(ap);
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208
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209 ++igmpstat.igps_rcv_total;
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210
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211 igmplen = ip->ip_len;
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212
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213 /*
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214 * Validate lengths
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215 */
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216 if (igmplen < IGMP_MINLEN) {
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217 ++igmpstat.igps_rcv_tooshort;
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218 m_freem(m);
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219 return;
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220 }
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221 minlen = iphlen + IGMP_MINLEN;
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222 if ((m->m_flags & M_EXT || m->m_len < minlen) &&
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223 (m = m_pullup(m, minlen)) == 0) {
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224 ++igmpstat.igps_rcv_tooshort;
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225 return;
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226 }
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227
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228 /*
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229 * Validate checksum
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230 */
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231 m->m_data += iphlen;
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232 m->m_len -= iphlen;
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233 igmp = mtod(m, struct igmp *);
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234 if (in_cksum(m, igmplen)) {
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235 ++igmpstat.igps_rcv_badsum;
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236 m_freem(m);
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237 return;
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238 }
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239 m->m_data -= iphlen;
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240 m->m_len += iphlen;
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241 ip = mtod(m, struct ip *);
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242
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243 switch (igmp->igmp_type) {
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244
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245 case IGMP_HOST_MEMBERSHIP_QUERY:
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246 ++igmpstat.igps_rcv_queries;
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247
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248 if (ifp->if_flags & IFF_LOOPBACK)
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249 break;
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250
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251 if (igmp->igmp_code == 0) {
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252 rti = rti_find(ifp);
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253 rti->rti_type = IGMP_v1_ROUTER;
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254 rti->rti_age = 0;
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255
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256 if (ip->ip_dst.s_addr != INADDR_ALLHOSTS_GROUP) {
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257 ++igmpstat.igps_rcv_badqueries;
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258 m_freem(m);
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259 return;
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260 }
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261
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262 /*
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263 * Start the timers in all of our membership records
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264 * for the interface on which the query arrived,
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265 * except those that are already running and those
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266 * that belong to a "local" group (224.0.0.X).
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267 */
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268 IN_FIRST_MULTI(step, inm);
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269 while (inm != NULL) {
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270 if (inm->inm_ifp == ifp &&
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271 inm->inm_timer == 0 &&
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272 !IN_LOCAL_GROUP(inm->inm_addr.s_addr)) {
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273 inm->inm_state = IGMP_DELAYING_MEMBER;
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274 inm->inm_timer = IGMP_RANDOM_DELAY(
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275 IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ);
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276 igmp_timers_are_running = 1;
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277 }
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278 IN_NEXT_MULTI(step, inm);
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279 }
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280 } else {
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281 if (!IN_MULTICAST(ip->ip_dst.s_addr)) {
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282 ++igmpstat.igps_rcv_badqueries;
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283 m_freem(m);
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284 return;
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285 }
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286
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287 timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE;
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288
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289 /*
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290 * Start the timers in all of our membership records
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291 * for the interface on which the query arrived,
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292 * except those that are already running and those
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293 * that belong to a "local" group (224.0.0.X). For
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294 * timers already running, check if they need to be
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295 * reset.
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296 */
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297 IN_FIRST_MULTI(step, inm);
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298 while (inm != NULL) {
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299 if (inm->inm_ifp == ifp &&
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diff changeset
300 !IN_LOCAL_GROUP(inm->inm_addr.s_addr) &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
301 (ip->ip_dst.s_addr == INADDR_ALLHOSTS_GROUP ||
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
302 ip->ip_dst.s_addr == inm->inm_addr.s_addr)) {
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jlarmour
parents:
diff changeset
303 switch (inm->inm_state) {
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jlarmour
parents:
diff changeset
304 case IGMP_DELAYING_MEMBER:
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jlarmour
parents:
diff changeset
305 if (inm->inm_timer <= timer)
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jlarmour
parents:
diff changeset
306 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
307 /* FALLTHROUGH */
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jlarmour
parents:
diff changeset
308 case IGMP_IDLE_MEMBER:
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jlarmour
parents:
diff changeset
309 case IGMP_LAZY_MEMBER:
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jlarmour
parents:
diff changeset
310 case IGMP_AWAKENING_MEMBER:
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jlarmour
parents:
diff changeset
311 inm->inm_state =
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jlarmour
parents:
diff changeset
312 IGMP_DELAYING_MEMBER;
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jlarmour
parents:
diff changeset
313 inm->inm_timer =
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jlarmour
parents:
diff changeset
314 IGMP_RANDOM_DELAY(timer);
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jlarmour
parents:
diff changeset
315 igmp_timers_are_running = 1;
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jlarmour
parents:
diff changeset
316 break;
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jlarmour
parents:
diff changeset
317 case IGMP_SLEEPING_MEMBER:
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jlarmour
parents:
diff changeset
318 inm->inm_state =
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jlarmour
parents:
diff changeset
319 IGMP_AWAKENING_MEMBER;
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jlarmour
parents:
diff changeset
320 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
321 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
322 }
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jlarmour
parents:
diff changeset
323 IN_NEXT_MULTI(step, inm);
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jlarmour
parents:
diff changeset
324 }
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jlarmour
parents:
diff changeset
325 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
326
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
327 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
328
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
329 case IGMP_v1_HOST_MEMBERSHIP_REPORT:
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jlarmour
parents:
diff changeset
330 ++igmpstat.igps_rcv_reports;
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jlarmour
parents:
diff changeset
331
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
332 if (ifp->if_flags & IFF_LOOPBACK)
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jlarmour
parents:
diff changeset
333 break;
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jlarmour
parents:
diff changeset
334
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
335 if (!IN_MULTICAST(igmp->igmp_group.s_addr) ||
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jlarmour
parents:
diff changeset
336 igmp->igmp_group.s_addr != ip->ip_dst.s_addr) {
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jlarmour
parents:
diff changeset
337 ++igmpstat.igps_rcv_badreports;
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jlarmour
parents:
diff changeset
338 m_freem(m);
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jlarmour
parents:
diff changeset
339 return;
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jlarmour
parents:
diff changeset
340 }
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jlarmour
parents:
diff changeset
341
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
342 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
343 * KLUDGE: if the IP source address of the report has an
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
344 * unspecified (i.e., zero) subnet number, as is allowed for
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
345 * a booting host, replace it with the correct subnet number
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jlarmour
parents:
diff changeset
346 * so that a process-level multicast routing daemon can
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
347 * determine which subnet it arrived from. This is necessary
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
348 * to compensate for the lack of any way for a process to
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jlarmour
parents:
diff changeset
349 * determine the arrival interface of an incoming packet.
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jlarmour
parents:
diff changeset
350 */
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jlarmour
parents:
diff changeset
351 if ((ip->ip_src.s_addr & IN_CLASSA_NET) == 0) {
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jlarmour
parents:
diff changeset
352 IFP_TO_IA(ifp, ia);
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jlarmour
parents:
diff changeset
353 if (ia)
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jlarmour
parents:
diff changeset
354 ip->ip_src.s_addr = ia->ia_subnet;
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jlarmour
parents:
diff changeset
355 }
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jlarmour
parents:
diff changeset
356
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
357 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
358 * If we belong to the group being reported, stop
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
359 * our timer for that group.
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jlarmour
parents:
diff changeset
360 */
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jlarmour
parents:
diff changeset
361 IN_LOOKUP_MULTI(igmp->igmp_group, ifp, inm);
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jlarmour
parents:
diff changeset
362 if (inm != NULL) {
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jlarmour
parents:
diff changeset
363 inm->inm_timer = 0;
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jlarmour
parents:
diff changeset
364 ++igmpstat.igps_rcv_ourreports;
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jlarmour
parents:
diff changeset
365
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jlarmour
parents:
diff changeset
366 switch (inm->inm_state) {
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jlarmour
parents:
diff changeset
367 case IGMP_IDLE_MEMBER:
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jlarmour
parents:
diff changeset
368 case IGMP_LAZY_MEMBER:
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jlarmour
parents:
diff changeset
369 case IGMP_AWAKENING_MEMBER:
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jlarmour
parents:
diff changeset
370 case IGMP_SLEEPING_MEMBER:
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jlarmour
parents:
diff changeset
371 inm->inm_state = IGMP_SLEEPING_MEMBER;
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jlarmour
parents:
diff changeset
372 break;
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jlarmour
parents:
diff changeset
373 case IGMP_DELAYING_MEMBER:
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jlarmour
parents:
diff changeset
374 if (inm->inm_rti->rti_type == IGMP_v1_ROUTER)
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jlarmour
parents:
diff changeset
375 inm->inm_state = IGMP_LAZY_MEMBER;
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jlarmour
parents:
diff changeset
376 else
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jlarmour
parents:
diff changeset
377 inm->inm_state = IGMP_SLEEPING_MEMBER;
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jlarmour
parents:
diff changeset
378 break;
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jlarmour
parents:
diff changeset
379 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
380 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
381
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
382 break;
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jlarmour
parents:
diff changeset
383
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
384 case IGMP_v2_HOST_MEMBERSHIP_REPORT:
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jlarmour
parents:
diff changeset
385 #ifdef MROUTING
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jlarmour
parents:
diff changeset
386 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
387 * Make sure we don't hear our own membership report. Fast
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
388 * leave requires knowing that we are the only member of a
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
389 * group.
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jlarmour
parents:
diff changeset
390 */
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jlarmour
parents:
diff changeset
391 IFP_TO_IA(ifp, ia);
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jlarmour
parents:
diff changeset
392 if (ia && ip->ip_src.s_addr == ia->ia_addr.sin_addr.s_addr)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
393 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
394 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
395
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
396 ++igmpstat.igps_rcv_reports;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
397
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
398 if (ifp->if_flags & IFF_LOOPBACK)
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jlarmour
parents:
diff changeset
399 break;
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jlarmour
parents:
diff changeset
400
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
401 if (!IN_MULTICAST(igmp->igmp_group.s_addr) ||
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
402 igmp->igmp_group.s_addr != ip->ip_dst.s_addr) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
403 ++igmpstat.igps_rcv_badreports;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
404 m_freem(m);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
405 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
406 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
407
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
408 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
409 * KLUDGE: if the IP source address of the report has an
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
410 * unspecified (i.e., zero) subnet number, as is allowed for
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
411 * a booting host, replace it with the correct subnet number
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
412 * so that a process-level multicast routing daemon can
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
413 * determine which subnet it arrived from. This is necessary
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
414 * to compensate for the lack of any way for a process to
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
415 * determine the arrival interface of an incoming packet.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
416 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
417 if ((ip->ip_src.s_addr & IN_CLASSA_NET) == 0) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
418 #ifndef MROUTING
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
419 IFP_TO_IA(ifp, ia);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
420 #endif
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
421 if (ia)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
422 ip->ip_src.s_addr = ia->ia_subnet;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
423 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
424
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
425 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
426 * If we belong to the group being reported, stop
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
427 * our timer for that group.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
428 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
429 IN_LOOKUP_MULTI(igmp->igmp_group, ifp, inm);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
430 if (inm != NULL) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
431 inm->inm_timer = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
432 ++igmpstat.igps_rcv_ourreports;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
433
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
434 switch (inm->inm_state) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
435 case IGMP_DELAYING_MEMBER:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
436 case IGMP_IDLE_MEMBER:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
437 case IGMP_AWAKENING_MEMBER:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
438 inm->inm_state = IGMP_LAZY_MEMBER;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
439 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
440 case IGMP_LAZY_MEMBER:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
441 case IGMP_SLEEPING_MEMBER:
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
442 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
443 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
444 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
445
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
446 break;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
447
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
448 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
449
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
450 /*
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jlarmour
parents:
diff changeset
451 * Pass all valid IGMP packets up to any process(es) listening
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jlarmour
parents:
diff changeset
452 * on a raw IGMP socket.
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jlarmour
parents:
diff changeset
453 */
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jlarmour
parents:
diff changeset
454 rip_input(m, iphlen, proto);
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jlarmour
parents:
diff changeset
455 return;
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jlarmour
parents:
diff changeset
456 }
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jlarmour
parents:
diff changeset
457
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jlarmour
parents:
diff changeset
458 void
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jlarmour
parents:
diff changeset
459 igmp_joingroup(inm)
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jlarmour
parents:
diff changeset
460 struct in_multi *inm;
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jlarmour
parents:
diff changeset
461 {
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jlarmour
parents:
diff changeset
462 int s = splsoftnet();
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jlarmour
parents:
diff changeset
463
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jlarmour
parents:
diff changeset
464 inm->inm_state = IGMP_IDLE_MEMBER;
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jlarmour
parents:
diff changeset
465
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jlarmour
parents:
diff changeset
466 if (!IN_LOCAL_GROUP(inm->inm_addr.s_addr) &&
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jlarmour
parents:
diff changeset
467 (inm->inm_ifp->if_flags & IFF_LOOPBACK) == 0) {
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jlarmour
parents:
diff changeset
468 igmp_sendpkt(inm, rti_fill(inm));
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jlarmour
parents:
diff changeset
469 inm->inm_state = IGMP_DELAYING_MEMBER;
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jlarmour
parents:
diff changeset
470 inm->inm_timer = IGMP_RANDOM_DELAY(
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jlarmour
parents:
diff changeset
471 IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ);
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jlarmour
parents:
diff changeset
472 igmp_timers_are_running = 1;
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jlarmour
parents:
diff changeset
473 } else
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jlarmour
parents:
diff changeset
474 inm->inm_timer = 0;
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jlarmour
parents:
diff changeset
475 splx(s);
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jlarmour
parents:
diff changeset
476 }
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jlarmour
parents:
diff changeset
477
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jlarmour
parents:
diff changeset
478 void
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jlarmour
parents:
diff changeset
479 igmp_leavegroup(inm)
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jlarmour
parents:
diff changeset
480 struct in_multi *inm;
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jlarmour
parents:
diff changeset
481 {
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jlarmour
parents:
diff changeset
482
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jlarmour
parents:
diff changeset
483 switch (inm->inm_state) {
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jlarmour
parents:
diff changeset
484 case IGMP_DELAYING_MEMBER:
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jlarmour
parents:
diff changeset
485 case IGMP_IDLE_MEMBER:
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jlarmour
parents:
diff changeset
486 if (!IN_LOCAL_GROUP(inm->inm_addr.s_addr) &&
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jlarmour
parents:
diff changeset
487 (inm->inm_ifp->if_flags & IFF_LOOPBACK) == 0)
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parents:
diff changeset
488 if (inm->inm_rti->rti_type != IGMP_v1_ROUTER)
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jlarmour
parents:
diff changeset
489 igmp_sendpkt(inm, IGMP_HOST_LEAVE_MESSAGE);
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jlarmour
parents:
diff changeset
490 break;
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jlarmour
parents:
diff changeset
491 case IGMP_LAZY_MEMBER:
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jlarmour
parents:
diff changeset
492 case IGMP_AWAKENING_MEMBER:
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jlarmour
parents:
diff changeset
493 case IGMP_SLEEPING_MEMBER:
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jlarmour
parents:
diff changeset
494 break;
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jlarmour
parents:
diff changeset
495 }
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jlarmour
parents:
diff changeset
496 }
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jlarmour
parents:
diff changeset
497
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jlarmour
parents:
diff changeset
498 void
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jlarmour
parents:
diff changeset
499 igmp_fasttimo()
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jlarmour
parents:
diff changeset
500 {
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jlarmour
parents:
diff changeset
501 register struct in_multi *inm;
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jlarmour
parents:
diff changeset
502 struct in_multistep step;
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jlarmour
parents:
diff changeset
503 int s;
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jlarmour
parents:
diff changeset
504
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jlarmour
parents:
diff changeset
505 /*
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jlarmour
parents:
diff changeset
506 * Quick check to see if any work needs to be done, in order
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jlarmour
parents:
diff changeset
507 * to minimize the overhead of fasttimo processing.
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jlarmour
parents:
diff changeset
508 */
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jlarmour
parents:
diff changeset
509 if (!igmp_timers_are_running)
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jlarmour
parents:
diff changeset
510 return;
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jlarmour
parents:
diff changeset
511
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jlarmour
parents:
diff changeset
512 s = splsoftnet();
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jlarmour
parents:
diff changeset
513 igmp_timers_are_running = 0;
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jlarmour
parents:
diff changeset
514 IN_FIRST_MULTI(step, inm);
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jlarmour
parents:
diff changeset
515 while (inm != NULL) {
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jlarmour
parents:
diff changeset
516 if (inm->inm_timer == 0) {
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jlarmour
parents:
diff changeset
517 /* do nothing */
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jlarmour
parents:
diff changeset
518 } else if (--inm->inm_timer == 0) {
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jlarmour
parents:
diff changeset
519 if (inm->inm_state == IGMP_DELAYING_MEMBER) {
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jlarmour
parents:
diff changeset
520 if (inm->inm_rti->rti_type == IGMP_v1_ROUTER)
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jlarmour
parents:
diff changeset
521 igmp_sendpkt(inm,
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jlarmour
parents:
diff changeset
522 IGMP_v1_HOST_MEMBERSHIP_REPORT);
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jlarmour
parents:
diff changeset
523 else
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jlarmour
parents:
diff changeset
524 igmp_sendpkt(inm,
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jlarmour
parents:
diff changeset
525 IGMP_v2_HOST_MEMBERSHIP_REPORT);
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jlarmour
parents:
diff changeset
526 inm->inm_state = IGMP_IDLE_MEMBER;
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jlarmour
parents:
diff changeset
527 }
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jlarmour
parents:
diff changeset
528 } else {
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jlarmour
parents:
diff changeset
529 igmp_timers_are_running = 1;
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jlarmour
parents:
diff changeset
530 }
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jlarmour
parents:
diff changeset
531 IN_NEXT_MULTI(step, inm);
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jlarmour
parents:
diff changeset
532 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
533 splx(s);
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jlarmour
parents:
diff changeset
534 }
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jlarmour
parents:
diff changeset
535
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
536 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
537 igmp_slowtimo()
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
538 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
539 register struct router_info *rti;
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jlarmour
parents:
diff changeset
540 int s;
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jlarmour
parents:
diff changeset
541
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jlarmour
parents:
diff changeset
542 s = splsoftnet();
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jlarmour
parents:
diff changeset
543 for (rti = rti_head; rti != 0; rti = rti->rti_next) {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
544 if (rti->rti_type == IGMP_v1_ROUTER &&
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
545 ++rti->rti_age >= IGMP_AGE_THRESHOLD) {
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jlarmour
parents:
diff changeset
546 rti->rti_type = IGMP_v2_ROUTER;
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jlarmour
parents:
diff changeset
547 }
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
548 }
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jlarmour
parents:
diff changeset
549 splx(s);
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jlarmour
parents:
diff changeset
550 }
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jlarmour
parents:
diff changeset
551
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
552 void
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
553 igmp_sendpkt(inm, type)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
554 struct in_multi *inm;
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jlarmour
parents:
diff changeset
555 int type;
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jlarmour
parents:
diff changeset
556 {
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
557 struct mbuf *m;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
558 struct igmp *igmp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
559 struct ip *ip;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
560 struct ip_moptions imo;
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jlarmour
parents:
diff changeset
561 #ifdef MROUTING
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jlarmour
parents:
diff changeset
562 extern struct socket *ip_mrouter;
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jlarmour
parents:
diff changeset
563 #endif /* MROUTING */
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jlarmour
parents:
diff changeset
564
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
565 MGETHDR(m, M_DONTWAIT, MT_HEADER);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
566 if (m == NULL)
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
567 return;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
568 /*
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
569 * Assume max_linkhdr + sizeof(struct ip) + IGMP_MINLEN
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
570 * is smaller than mbuf size returned by MGETHDR.
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
571 */
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
572 m->m_data += max_linkhdr;
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jlarmour
parents:
diff changeset
573 m->m_len = sizeof(struct ip) + IGMP_MINLEN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
574 m->m_pkthdr.len = sizeof(struct ip) + IGMP_MINLEN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
575
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
576 ip = mtod(m, struct ip *);
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jlarmour
parents:
diff changeset
577 ip->ip_tos = 0;
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jlarmour
parents:
diff changeset
578 ip->ip_len = sizeof(struct ip) + IGMP_MINLEN;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
579 ip->ip_off = 0;
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jlarmour
parents:
diff changeset
580 ip->ip_p = IPPROTO_IGMP;
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jlarmour
parents:
diff changeset
581 ip->ip_src.s_addr = INADDR_ANY;
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jlarmour
parents:
diff changeset
582 ip->ip_dst = inm->inm_addr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
583
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
584 m->m_data += sizeof(struct ip);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
585 m->m_len -= sizeof(struct ip);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
586 igmp = mtod(m, struct igmp *);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
587 igmp->igmp_type = type;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
588 igmp->igmp_code = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
589 igmp->igmp_group = inm->inm_addr;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
590 igmp->igmp_cksum = 0;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
591 igmp->igmp_cksum = in_cksum(m, IGMP_MINLEN);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
592 m->m_data -= sizeof(struct ip);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
593 m->m_len += sizeof(struct ip);
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
594
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
595 imo.imo_multicast_ifp = inm->inm_ifp;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
596 imo.imo_multicast_ttl = 1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
597 #ifdef RSVP_ISI
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
598 imo.imo_multicast_vif = -1;
ced4577552cd Merge from eCos master repository on 2000-06-06-08:44:00-BST
jlarmour
parents:
diff changeset
599 #endif
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600 /*
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601 * Request loopback of the report if we are acting as a multicast
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602 * router, so that the process-level routing demon can hear it.
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603 */
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604 #ifdef MROUTING
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605 imo.imo_multicast_loop = (ip_mrouter != NULL);
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606 #else
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607 imo.imo_multicast_loop = 0;
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608 #endif /* MROUTING */
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609
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610 #if 0 /*KAME IPSEC*/
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611 m->m_pkthdr.rcvif = NULL;
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612 #endif /*IPSEC*/
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613 ip_output(m, (struct mbuf *)0, (struct route *)0, IP_MULTICASTOPTS,
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614 &imo, NULL);
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615
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616 ++igmpstat.igps_snd_reports;
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617 }