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annotate packages/net/bsd_tcpip/current/src/sys/netinet6/mld6.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
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children 74dbf4c3f2e1
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1 //==========================================================================
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2 //
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3 // src/sys/netinet6/mld6.c
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4 //
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5 //==========================================================================
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6 //####BSDCOPYRIGHTBEGIN####
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7 //
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8 // -------------------------------------------
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9 //
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10 // Portions of this software may have been derived from OpenBSD,
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11 // FreeBSD or other sources, and are covered by the appropriate
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12 // copyright disclaimers included herein.
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13 //
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14 // Portions created by Red Hat are
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15 // Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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16 //
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17 // -------------------------------------------
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18 //
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19 //####BSDCOPYRIGHTEND####
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20 //==========================================================================
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21
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22 /* $KAME: mld6.c,v 1.35 2001/12/18 02:23:44 itojun Exp $ */
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23
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24 /*
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25 * Copyright (C) 1998 WIDE Project.
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26 * All rights reserved.
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27 *
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28 * Redistribution and use in source and binary forms, with or without
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29 * modification, are permitted provided that the following conditions
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30 * are met:
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31 * 1. Redistributions of source code must retain the above copyright
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32 * notice, this list of conditions and the following disclaimer.
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33 * 2. Redistributions in binary form must reproduce the above copyright
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34 * notice, this list of conditions and the following disclaimer in the
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35 * documentation and/or other materials provided with the distribution.
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36 * 3. Neither the name of the project nor the names of its contributors
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37 * may be used to endorse or promote products derived from this software
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38 * without specific prior written permission.
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39 *
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40 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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43 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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50 * SUCH DAMAGE.
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51 */
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52
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53 /*
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54 * Copyright (c) 1988 Stephen Deering.
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55 * Copyright (c) 1992, 1993
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56 * The Regents of the University of California. All rights reserved.
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57 *
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58 * This code is derived from software contributed to Berkeley by
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59 * Stephen Deering of Stanford University.
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60 *
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61 * Redistribution and use in source and binary forms, with or without
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62 * modification, are permitted provided that the following conditions
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63 * are met:
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64 * 1. Redistributions of source code must retain the above copyright
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65 * notice, this list of conditions and the following disclaimer.
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66 * 2. Redistributions in binary form must reproduce the above copyright
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67 * notice, this list of conditions and the following disclaimer in the
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68 * documentation and/or other materials provided with the distribution.
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69 * 3. All advertising materials mentioning features or use of this software
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70 * must display the following acknowledgement:
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71 * This product includes software developed by the University of
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72 * California, Berkeley and its contributors.
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73 * 4. Neither the name of the University nor the names of its contributors
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74 * may be used to endorse or promote products derived from this software
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75 * without specific prior written permission.
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76 *
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77 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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78 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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79 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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80 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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81 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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84 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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85 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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86 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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87 * SUCH DAMAGE.
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88 *
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89 * @(#)igmp.c 8.1 (Berkeley) 7/19/93
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90 */
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91
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92 #include <sys/param.h>
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93 #include <sys/mbuf.h>
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94 #include <sys/socket.h>
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95 #include <sys/protosw.h>
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96 #ifdef __OpenBSD__
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97 #include <dev/rndvar.h>
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98 #endif
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99
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100 #include <net/if.h>
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101 #ifdef NEW_STRUCT_ROUTE
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102 #include <net/route.h>
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103 #endif
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104
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105 #include <netinet/in.h>
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106 #include <netinet/in_var.h>
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107 #include <netinet/ip6.h>
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108 #include <netinet6/ip6_var.h>
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109 #include <netinet/icmp6.h>
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110 #include <netinet6/mld6_var.h>
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111
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112 /*
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113 * Protocol constants
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114 */
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115
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116 /* denotes that the MLD max response delay field specifies time in milliseconds */
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117 #define MLD6_TIMER_SCALE 1000
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118 /*
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119 * time between repetitions of a node's initial report of interest in a
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120 * multicast address(in seconds)
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121 */
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122 #define MLD6_UNSOLICITED_REPORT_INTERVAL 10
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123
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124 static struct ip6_pktopts ip6_opts;
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125 static int mld6_timers_are_running;
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126 /* XXX: These are necessary for KAME's link-local hack */
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127 static struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
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128 static struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
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129
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130 static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *));
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131
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132 void
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133 mld6_init()
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134 {
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135 static u_int8_t hbh_buf[8];
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136 struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
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137 u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
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138
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139 mld6_timers_are_running = 0;
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140
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141 /* ip6h_nxt will be fill in later */
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142 hbh->ip6h_len = 0; /* (8 >> 3) - 1 */
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143
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144 /* XXX: grotty hard coding... */
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145 hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */
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146 hbh_buf[3] = 0;
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147 hbh_buf[4] = IP6OPT_RTALERT;
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148 hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
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149 bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
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150
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151 init_ip6pktopts(&ip6_opts);
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152 ip6_opts.ip6po_hbh = hbh;
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153 }
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154
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155 void
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156 mld6_start_listening(in6m)
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157 struct in6_multi *in6m;
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158 {
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159 #ifdef __NetBSD__
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160 int s = splsoftnet();
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161 #else
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162 int s = splnet();
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163 #endif
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164
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165 /*
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166 * RFC2710 page 10:
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167 * The node never sends a Report or Done for the link-scope all-nodes
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168 * address.
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169 * MLD messages are never sent for multicast addresses whose scope is 0
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170 * (reserved) or 1 (node-local).
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171 */
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172 mld6_all_nodes_linklocal.s6_addr16[1] =
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173 htons(in6m->in6m_ifp->if_index); /* XXX */
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174 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) ||
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175 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
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176 in6m->in6m_timer = 0;
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177 in6m->in6m_state = MLD6_OTHERLISTENER;
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178 } else {
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179 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
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180 in6m->in6m_timer = MLD6_RANDOM_DELAY(
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181 MLD6_UNSOLICITED_REPORT_INTERVAL * PR_FASTHZ);
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182 in6m->in6m_state = MLD6_IREPORTEDLAST;
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183 mld6_timers_are_running = 1;
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184 }
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185 splx(s);
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186 }
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187
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188 void
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189 mld6_stop_listening(in6m)
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190 struct in6_multi *in6m;
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191 {
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192 mld6_all_nodes_linklocal.s6_addr16[1] =
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193 htons(in6m->in6m_ifp->if_index); /* XXX */
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194 mld6_all_routers_linklocal.s6_addr16[1] =
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195 htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
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196
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197 if (in6m->in6m_state == MLD6_IREPORTEDLAST &&
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198 (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) &&
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199 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_INTFACELOCAL)
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200 mld6_sendpkt(in6m, MLD_LISTENER_DONE,
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201 &mld6_all_routers_linklocal);
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202 }
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203
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204 void
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205 mld6_input(m, off)
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206 struct mbuf *m;
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207 int off;
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208 {
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209 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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210 struct mld_hdr *mldh;
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211 struct ifnet *ifp = m->m_pkthdr.rcvif;
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212 struct in6_multi *in6m;
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213 struct in6_ifaddr *ia;
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214 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
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215 struct ifmultiaddr *ifma;
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216 #endif
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217 int timer; /* timer value in the MLD query header */
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218
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219 #ifndef PULLDOWN_TEST
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220 IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),);
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221 mldh = (struct mld_hdr *)(mtod(m, caddr_t) + off);
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222 #else
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223 IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
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224 if (mldh == NULL) {
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225 icmp6stat.icp6s_tooshort++;
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226 return;
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227 }
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228 #endif
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229
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230 /* source address validation */
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231 ip6 = mtod(m, struct ip6_hdr *); /* in case mpullup */
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232 if (!(IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src) ||
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233 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src))) {
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234 #if 0 /* do not log in an input path */
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235 log(LOG_INFO,
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236 "mld6_input: src %s is not link-local (grp=%s)\n",
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237 ip6_sprintf(&ip6->ip6_src),
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238 ip6_sprintf(&mldh->mld_addr));
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239 #endif
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240 /*
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241 * spec (RFC2710) does not explicitly
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242 * specify to discard the packet from a non link-local
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243 * source address. But we believe it's expected to do so.
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244 */
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245 m_freem(m);
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246 return;
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247 }
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248
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249 /*
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250 * In the MLD6 specification, there are 3 states and a flag.
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251 *
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252 * In Non-Listener state, we simply don't have a membership record.
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253 * In Delaying Listener state, our timer is running (in6m->in6m_timer)
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254 * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
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255 *
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256 * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if
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257 * we have heard a report from another member, or MLD6_IREPORTEDLAST
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258 * if we sent the last report.
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259 */
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260 switch (mldh->mld_type) {
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261 case MLD_LISTENER_QUERY:
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262 if (ifp->if_flags & IFF_LOOPBACK)
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263 break;
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264
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265 if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) &&
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266 !IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
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267 break; /* print error or log stat? */
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268 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
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269 mldh->mld_addr.s6_addr16[1] =
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270 htons(ifp->if_index); /* XXX */
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271
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272 /*
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273 * - Start the timers in all of our membership records
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diff changeset
274 * that the query applies to for the interface on
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diff changeset
275 * which the query arrived excl. those that belong
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diff changeset
276 * to the "all-nodes" group (ff02::1).
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diff changeset
277 * - Restart any timer that is already running but has
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parents:
diff changeset
278 * A value longer than the requested timeout.
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diff changeset
279 * - Use the value specified in the query message as
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diff changeset
280 * the maximum timeout.
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281 */
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diff changeset
282 IFP_TO_IA6(ifp, ia);
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diff changeset
283 if (ia == NULL)
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diff changeset
284 break;
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diff changeset
285
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286 /*
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287 * XXX: System timer resolution is too low to handle Max
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diff changeset
288 * Response Delay, so set 1 to the internal timer even if
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diff changeset
289 * the calculated value equals to zero when Max Response
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diff changeset
290 * Delay is positive.
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291 */
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292 timer = ntohs(mldh->mld_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE;
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293 if (timer == 0 && mldh->mld_maxdelay)
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294 timer = 1;
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295 mld6_all_nodes_linklocal.s6_addr16[1] =
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296 htons(ifp->if_index); /* XXX */
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297
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298 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
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299 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
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300 #else
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301 for (in6m = ia->ia6_multiaddrs.lh_first;
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302 in6m;
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303 in6m = in6m->in6m_entry.le_next)
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304 #endif
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305 {
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306 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
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307 if (ifma->ifma_addr->sa_family != AF_INET6)
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308 continue;
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309 in6m = (struct in6_multi *)ifma->ifma_protospec;
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310 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
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311 &mld6_all_nodes_linklocal) ||
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312 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
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313 IPV6_ADDR_SCOPE_LINKLOCAL)
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314 continue;
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315 #else
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316 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
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317 &mld6_all_nodes_linklocal) ||
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318 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
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319 IPV6_ADDR_SCOPE_LINKLOCAL)
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320 continue;
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321 #endif
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322
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323 if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) ||
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324 IN6_ARE_ADDR_EQUAL(&mldh->mld_addr,
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325 &in6m->in6m_addr))
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326 {
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327 if (timer == 0) {
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328 /* send a report immediately */
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329 mld6_sendpkt(in6m, MLD_LISTENER_REPORT,
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330 NULL);
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331 in6m->in6m_timer = 0; /* reset timer */
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332 in6m->in6m_state = MLD6_IREPORTEDLAST;
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333 }
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334 else if (in6m->in6m_timer == 0 || /* idle */
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335 in6m->in6m_timer > timer) {
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336 in6m->in6m_timer =
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337 MLD6_RANDOM_DELAY(timer);
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338 mld6_timers_are_running = 1;
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339 }
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340 }
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341 }
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342
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343 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
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344 mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
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345 break;
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346 case MLD_LISTENER_REPORT:
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347 /*
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348 * For fast leave to work, we have to know that we are the
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349 * last person to send a report for this group. Reports
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350 * can potentially get looped back if we are a multicast
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351 * router, so discard reports sourced by me.
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352 * Note that it is impossible to check IFF_LOOPBACK flag of
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353 * ifp for this purpose, since ip6_mloopback pass the physical
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354 * interface to looutput.
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355 */
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356 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
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357 break;
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diff changeset
358
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359 if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
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360 break;
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361
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362 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
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363 mldh->mld_addr.s6_addr16[1] =
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364 htons(ifp->if_index); /* XXX */
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365 /*
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366 * If we belong to the group being reported, stop
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367 * our timer for that group.
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368 */
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369 IN6_LOOKUP_MULTI(mldh->mld_addr, ifp, in6m);
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370 if (in6m) {
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371 in6m->in6m_timer = 0; /* transit to idle state */
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372 in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */
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373 }
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374
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375 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
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376 mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
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377 break;
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378 default: /* this is impossible */
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379 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type);
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380 break;
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381 }
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382
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383 m_freem(m);
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384 }
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diff changeset
385
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diff changeset
386 void
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diff changeset
387 mld6_fasttimeo()
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388 {
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389 struct in6_multi *in6m;
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390 struct in6_multistep step;
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diff changeset
391 int s;
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diff changeset
392
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393 /*
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394 * Quick check to see if any work needs to be done, in order
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395 * to minimize the overhead of fasttimo processing.
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396 */
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397 if (!mld6_timers_are_running)
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398 return;
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399
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400 #ifdef __NetBSD__
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401 s = splsoftnet();
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diff changeset
402 #else
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403 s = splnet();
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diff changeset
404 #endif
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405 mld6_timers_are_running = 0;
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406 IN6_FIRST_MULTI(step, in6m);
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diff changeset
407 while (in6m != NULL) {
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408 if (in6m->in6m_timer == 0) {
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409 /* do nothing */
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410 } else if (--in6m->in6m_timer == 0) {
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411 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
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412 in6m->in6m_state = MLD6_IREPORTEDLAST;
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parents:
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413 } else {
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414 mld6_timers_are_running = 1;
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415 }
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416 IN6_NEXT_MULTI(step, in6m);
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417 }
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diff changeset
418 splx(s);
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419 }
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420
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421 static void
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422 mld6_sendpkt(in6m, type, dst)
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423 struct in6_multi *in6m;
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424 int type;
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425 const struct in6_addr *dst;
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426 {
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427 struct mbuf *mh, *md;
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428 struct mld_hdr *mldh;
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429 struct ip6_hdr *ip6;
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430 struct ip6_moptions im6o;
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431 struct in6_ifaddr *ia;
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432 struct ifnet *ifp = in6m->in6m_ifp;
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433 int ignflags;
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434
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435 /*
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436 * At first, find a link local address on the outgoing interface
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437 * to use as the source address of the MLD packet.
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438 * We do not reject tentative addresses for MLD report to deal with
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439 * the case where we first join a link-local address.
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440 */
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441 ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
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442 if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
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443 return;
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444 if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
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445 ia = NULL;
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446
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447 /*
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448 * Allocate mbufs to store ip6 header and MLD header.
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449 * We allocate 2 mbufs and make chain in advance because
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450 * it is more convenient when inserting the hop-by-hop option later.
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451 */
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452 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
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453 if (mh == NULL)
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454 return;
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455 MGET(md, M_DONTWAIT, MT_DATA);
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456 if (md == NULL) {
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457 m_free(mh);
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458 return;
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459 }
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460 mh->m_next = md;
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461
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462 mh->m_pkthdr.rcvif = NULL;
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463 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
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464 mh->m_len = sizeof(struct ip6_hdr);
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diff changeset
465 MH_ALIGN(mh, sizeof(struct ip6_hdr));
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diff changeset
466
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467 /* fill in the ip6 header */
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468 ip6 = mtod(mh, struct ip6_hdr *);
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469 ip6->ip6_flow = 0;
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470 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
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471 ip6->ip6_vfc |= IPV6_VERSION;
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472 /* ip6_plen will be set later */
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473 ip6->ip6_nxt = IPPROTO_ICMPV6;
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474 /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
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475 ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
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476 ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
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diff changeset
477
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diff changeset
478 /* fill in the MLD header */
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diff changeset
479 md->m_len = sizeof(struct mld_hdr);
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480 mldh = mtod(md, struct mld_hdr *);
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481 mldh->mld_type = type;
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482 mldh->mld_code = 0;
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483 mldh->mld_cksum = 0;
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diff changeset
484 /* XXX: we assume the function will not be called for query messages */
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diff changeset
485 mldh->mld_maxdelay = 0;
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486 mldh->mld_reserved = 0;
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487 mldh->mld_addr = in6m->in6m_addr;
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488 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
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489 mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
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490 mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
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diff changeset
491 sizeof(struct ip6_hdr),
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diff changeset
492 sizeof(struct mld_hdr));
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diff changeset
493
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diff changeset
494 /* construct multicast option */
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diff changeset
495 bzero(&im6o, sizeof(im6o));
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diff changeset
496 im6o.im6o_multicast_ifp = ifp;
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diff changeset
497 im6o.im6o_multicast_hlim = 1;
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diff changeset
498
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diff changeset
499 /*
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diff changeset
500 * Request loopback of the report if we are acting as a multicast
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diff changeset
501 * router, so that the process-level routing daemon can hear it.
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diff changeset
502 */
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diff changeset
503 im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
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diff changeset
504
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diff changeset
505 /* increment output statictics */
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diff changeset
506 icmp6stat.icp6s_outhist[type]++;
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diff changeset
507 icmp6_ifstat_inc(ifp, ifs6_out_msg);
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diff changeset
508 switch (type) {
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diff changeset
509 case MLD_LISTENER_QUERY:
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diff changeset
510 icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
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diff changeset
511 break;
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diff changeset
512 case MLD_LISTENER_REPORT:
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diff changeset
513 icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
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diff changeset
514 break;
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diff changeset
515 case MLD_LISTENER_DONE:
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diff changeset
516 icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
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diff changeset
517 break;
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diff changeset
518 }
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diff changeset
519
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diff changeset
520 ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, &im6o, NULL);
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diff changeset
521 }