1 | /* |
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2 | * Copyright (c) 1982, 1986, 1988, 1990, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. All advertising materials mentioning features or use of this software |
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14 | * must display the following acknowledgement: |
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15 | * This product includes software developed by the University of |
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16 | * California, Berkeley and its contributors. |
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17 | * 4. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | * |
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33 | * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 |
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34 | * $Id$ |
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35 | */ |
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36 | |
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37 | #define _IP_VHL |
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38 | |
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39 | #include <sys/param.h> |
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40 | #include <sys/queue.h> |
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41 | #include <sys/systm.h> |
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42 | #include <sys/malloc.h> |
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43 | #include <sys/mbuf.h> |
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44 | #include <sys/errno.h> |
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45 | #include <sys/protosw.h> |
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46 | #include <sys/socket.h> |
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47 | #include <sys/socketvar.h> |
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48 | |
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49 | #include <net/if.h> |
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50 | #include <net/route.h> |
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51 | |
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52 | #include <netinet/in.h> |
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53 | #include <netinet/in_systm.h> |
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54 | #include <netinet/ip.h> |
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55 | #include <netinet/in_pcb.h> |
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56 | #include <netinet/in_var.h> |
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57 | #include <netinet/ip_var.h> |
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58 | |
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59 | #ifdef vax |
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60 | #include <machine/mtpr.h> |
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61 | #endif |
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62 | #include <machine/in_cksum.h> |
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63 | |
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64 | #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 |
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65 | #undef COMPAT_IPFW |
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66 | #define COMPAT_IPFW 1 |
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67 | #else |
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68 | #undef COMPAT_IPFW |
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69 | #endif |
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70 | |
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71 | u_short ip_id; |
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72 | |
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73 | static struct mbuf *ip_insertoptions __P((struct mbuf *, struct mbuf *, int *)); |
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74 | static void ip_mloopback |
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75 | __P((struct ifnet *, struct mbuf *, struct sockaddr_in *, int)); |
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76 | static int ip_getmoptions |
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77 | __P((int, struct ip_moptions *, struct mbuf **)); |
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78 | static int ip_optcopy __P((struct ip *, struct ip *)); |
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79 | static int ip_pcbopts __P((struct mbuf **, struct mbuf *)); |
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80 | static int ip_setmoptions |
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81 | __P((int, struct ip_moptions **, struct mbuf *)); |
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82 | |
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83 | extern struct protosw inetsw[]; |
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84 | |
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85 | /* |
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86 | * IP output. The packet in mbuf chain m contains a skeletal IP |
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87 | * header (with len, off, ttl, proto, tos, src, dst). |
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88 | * The mbuf chain containing the packet will be freed. |
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89 | * The mbuf opt, if present, will not be freed. |
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90 | */ |
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91 | int |
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92 | ip_output(m0, opt, ro, flags, imo) |
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93 | struct mbuf *m0; |
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94 | struct mbuf *opt; |
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95 | struct route *ro; |
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96 | int flags; |
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97 | struct ip_moptions *imo; |
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98 | { |
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99 | struct ip *ip, *mhip; |
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100 | struct ifnet *ifp; |
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101 | struct mbuf *m = m0; |
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102 | int hlen = sizeof (struct ip); |
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103 | int len, off, error = 0; |
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104 | struct sockaddr_in *dst; |
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105 | struct in_ifaddr *ia; |
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106 | int isbroadcast; |
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107 | |
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108 | #ifdef DIAGNOSTIC |
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109 | if ((m->m_flags & M_PKTHDR) == 0) |
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110 | panic("ip_output no HDR"); |
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111 | if (!ro) |
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112 | panic("ip_output no route, proto = %d", |
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113 | mtod(m, struct ip *)->ip_p); |
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114 | #endif |
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115 | if (opt) { |
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116 | m = ip_insertoptions(m, opt, &len); |
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117 | hlen = len; |
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118 | } |
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119 | ip = mtod(m, struct ip *); |
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120 | /* |
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121 | * Fill in IP header. |
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122 | */ |
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123 | if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { |
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124 | ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2); |
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125 | ip->ip_off &= IP_DF; |
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126 | ip->ip_id = htons(ip_id++); |
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127 | ipstat.ips_localout++; |
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128 | } else { |
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129 | hlen = IP_VHL_HL(ip->ip_vhl) << 2; |
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130 | } |
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131 | |
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132 | dst = (struct sockaddr_in *)&ro->ro_dst; |
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133 | /* |
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134 | * If there is a cached route, |
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135 | * check that it is to the same destination |
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136 | * and is still up. If not, free it and try again. |
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137 | */ |
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138 | if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || |
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139 | dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { |
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140 | RTFREE(ro->ro_rt); |
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141 | ro->ro_rt = (struct rtentry *)0; |
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142 | } |
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143 | if (ro->ro_rt == 0) { |
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144 | dst->sin_family = AF_INET; |
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145 | dst->sin_len = sizeof(*dst); |
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146 | dst->sin_addr = ip->ip_dst; |
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147 | } |
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148 | /* |
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149 | * If routing to interface only, |
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150 | * short circuit routing lookup. |
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151 | */ |
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152 | #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) |
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153 | #define sintosa(sin) ((struct sockaddr *)(sin)) |
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154 | if (flags & IP_ROUTETOIF) { |
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155 | if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 && |
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156 | (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) { |
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157 | ipstat.ips_noroute++; |
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158 | error = ENETUNREACH; |
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159 | goto bad; |
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160 | } |
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161 | ifp = ia->ia_ifp; |
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162 | ip->ip_ttl = 1; |
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163 | isbroadcast = in_broadcast(dst->sin_addr, ifp); |
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164 | } else { |
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165 | /* |
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166 | * If this is the case, we probably don't want to allocate |
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167 | * a protocol-cloned route since we didn't get one from the |
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168 | * ULP. This lets TCP do its thing, while not burdening |
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169 | * forwarding or ICMP with the overhead of cloning a route. |
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170 | * Of course, we still want to do any cloning requested by |
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171 | * the link layer, as this is probably required in all cases |
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172 | * for correct operation (as it is for ARP). |
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173 | */ |
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174 | if (ro->ro_rt == 0) |
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175 | rtalloc_ign(ro, RTF_PRCLONING); |
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176 | if (ro->ro_rt == 0) { |
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177 | ipstat.ips_noroute++; |
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178 | error = EHOSTUNREACH; |
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179 | goto bad; |
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180 | } |
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181 | ia = ifatoia(ro->ro_rt->rt_ifa); |
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182 | ifp = ro->ro_rt->rt_ifp; |
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183 | ro->ro_rt->rt_use++; |
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184 | if (ro->ro_rt->rt_flags & RTF_GATEWAY) |
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185 | dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; |
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186 | if (ro->ro_rt->rt_flags & RTF_HOST) |
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187 | isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); |
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188 | else |
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189 | isbroadcast = in_broadcast(dst->sin_addr, ifp); |
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190 | } |
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191 | if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { |
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192 | struct in_multi *inm; |
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193 | |
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194 | m->m_flags |= M_MCAST; |
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195 | /* |
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196 | * IP destination address is multicast. Make sure "dst" |
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197 | * still points to the address in "ro". (It may have been |
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198 | * changed to point to a gateway address, above.) |
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199 | */ |
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200 | dst = (struct sockaddr_in *)&ro->ro_dst; |
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201 | /* |
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202 | * See if the caller provided any multicast options |
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203 | */ |
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204 | if (imo != NULL) { |
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205 | ip->ip_ttl = imo->imo_multicast_ttl; |
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206 | if (imo->imo_multicast_ifp != NULL) |
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207 | ifp = imo->imo_multicast_ifp; |
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208 | if (imo->imo_multicast_vif != -1) |
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209 | ip->ip_src.s_addr = |
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210 | ip_mcast_src(imo->imo_multicast_vif); |
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211 | } else |
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212 | ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; |
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213 | /* |
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214 | * Confirm that the outgoing interface supports multicast. |
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215 | */ |
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216 | if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { |
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217 | if ((ifp->if_flags & IFF_MULTICAST) == 0) { |
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218 | ipstat.ips_noroute++; |
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219 | error = ENETUNREACH; |
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220 | goto bad; |
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221 | } |
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222 | } |
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223 | /* |
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224 | * If source address not specified yet, use address |
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225 | * of outgoing interface. |
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226 | */ |
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227 | if (ip->ip_src.s_addr == INADDR_ANY) { |
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228 | register struct in_ifaddr *ia; |
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229 | |
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230 | for (ia = in_ifaddr; ia; ia = ia->ia_next) |
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231 | if (ia->ia_ifp == ifp) { |
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232 | ip->ip_src = IA_SIN(ia)->sin_addr; |
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233 | break; |
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234 | } |
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235 | } |
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236 | |
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237 | IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm); |
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238 | if (inm != NULL && |
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239 | (imo == NULL || imo->imo_multicast_loop)) { |
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240 | /* |
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241 | * If we belong to the destination multicast group |
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242 | * on the outgoing interface, and the caller did not |
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243 | * forbid loopback, loop back a copy. |
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244 | */ |
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245 | ip_mloopback(ifp, m, dst, hlen); |
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246 | } |
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247 | else { |
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248 | /* |
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249 | * If we are acting as a multicast router, perform |
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250 | * multicast forwarding as if the packet had just |
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251 | * arrived on the interface to which we are about |
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252 | * to send. The multicast forwarding function |
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253 | * recursively calls this function, using the |
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254 | * IP_FORWARDING flag to prevent infinite recursion. |
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255 | * |
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256 | * Multicasts that are looped back by ip_mloopback(), |
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257 | * above, will be forwarded by the ip_input() routine, |
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258 | * if necessary. |
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259 | */ |
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260 | if (ip_mrouter && (flags & IP_FORWARDING) == 0) { |
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261 | /* |
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262 | * Check if rsvp daemon is running. If not, don't |
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263 | * set ip_moptions. This ensures that the packet |
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264 | * is multicast and not just sent down one link |
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265 | * as prescribed by rsvpd. |
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266 | */ |
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267 | if (!rsvp_on) |
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268 | imo = NULL; |
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269 | if (ip_mforward(ip, ifp, m, imo) != 0) { |
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270 | m_freem(m); |
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271 | goto done; |
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272 | } |
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273 | } |
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274 | } |
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275 | |
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276 | /* |
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277 | * Multicasts with a time-to-live of zero may be looped- |
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278 | * back, above, but must not be transmitted on a network. |
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279 | * Also, multicasts addressed to the loopback interface |
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280 | * are not sent -- the above call to ip_mloopback() will |
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281 | * loop back a copy if this host actually belongs to the |
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282 | * destination group on the loopback interface. |
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283 | */ |
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284 | if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { |
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285 | m_freem(m); |
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286 | goto done; |
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287 | } |
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288 | |
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289 | goto sendit; |
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290 | } |
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291 | #ifndef notdef |
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292 | /* |
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293 | * If source address not specified yet, use address |
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294 | * of outgoing interface. |
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295 | */ |
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296 | if (ip->ip_src.s_addr == INADDR_ANY) |
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297 | ip->ip_src = IA_SIN(ia)->sin_addr; |
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298 | #endif |
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299 | /* |
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300 | * Verify that we have any chance at all of being able to queue |
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301 | * the packet or packet fragments |
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302 | */ |
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303 | if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >= |
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304 | ifp->if_snd.ifq_maxlen) { |
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305 | error = ENOBUFS; |
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306 | goto bad; |
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307 | } |
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308 | |
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309 | /* |
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310 | * Look for broadcast address and |
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311 | * and verify user is allowed to send |
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312 | * such a packet. |
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313 | */ |
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314 | if (isbroadcast) { |
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315 | if ((ifp->if_flags & IFF_BROADCAST) == 0) { |
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316 | error = EADDRNOTAVAIL; |
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317 | goto bad; |
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318 | } |
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319 | if ((flags & IP_ALLOWBROADCAST) == 0) { |
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320 | error = EACCES; |
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321 | goto bad; |
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322 | } |
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323 | /* don't allow broadcast messages to be fragmented */ |
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324 | if ((u_short)ip->ip_len > ifp->if_mtu) { |
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325 | error = EMSGSIZE; |
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326 | goto bad; |
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327 | } |
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328 | m->m_flags |= M_BCAST; |
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329 | } else { |
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330 | m->m_flags &= ~M_BCAST; |
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331 | } |
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332 | |
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333 | sendit: |
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334 | /* |
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335 | * IpHack's section. |
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336 | * - Xlate: translate packet's addr/port (NAT). |
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337 | * - Firewall: deny/allow/etc. |
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338 | * - Wrap: fake packet's addr/port <unimpl.> |
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339 | * - Encapsulate: put it in another IP and send out. <unimp.> |
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340 | */ |
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341 | |
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342 | #ifdef COMPAT_IPFW |
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343 | if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, ifp, IP_NAT_OUT)) { |
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344 | error = EACCES; |
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345 | goto done; |
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346 | } |
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347 | |
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348 | /* |
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349 | * Check with the firewall... |
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350 | */ |
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351 | if (ip_fw_chk_ptr) { |
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352 | #ifdef IPDIVERT |
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353 | ip_divert_port = (*ip_fw_chk_ptr)(&ip, |
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354 | hlen, ifp, ip_divert_ignore, &m); |
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355 | ip_divert_ignore = 0; |
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356 | if (ip_divert_port) { /* Divert packet */ |
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357 | (*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, 0); |
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358 | goto done; |
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359 | } |
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360 | #else |
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361 | /* If ipfw says divert, we have to just drop packet */ |
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362 | if ((*ip_fw_chk_ptr)(&ip, hlen, ifp, 0, &m)) { |
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363 | m_freem(m); |
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364 | goto done; |
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365 | } |
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366 | #endif |
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367 | if (!m) { |
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368 | error = EACCES; |
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369 | goto done; |
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370 | } |
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371 | } |
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372 | #endif /* COMPAT_IPFW */ |
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373 | |
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374 | /* |
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375 | * If small enough for interface, can just send directly. |
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376 | */ |
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377 | if ((u_short)ip->ip_len <= ifp->if_mtu) { |
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378 | ip->ip_len = htons((u_short)ip->ip_len); |
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379 | ip->ip_off = htons((u_short)ip->ip_off); |
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380 | ip->ip_sum = 0; |
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381 | if (ip->ip_vhl == IP_VHL_BORING) { |
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382 | ip->ip_sum = in_cksum_hdr(ip); |
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383 | } else { |
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384 | ip->ip_sum = in_cksum(m, hlen); |
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385 | } |
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386 | error = (*ifp->if_output)(ifp, m, |
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387 | (struct sockaddr *)dst, ro->ro_rt); |
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388 | goto done; |
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389 | } |
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390 | /* |
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391 | * Too large for interface; fragment if possible. |
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392 | * Must be able to put at least 8 bytes per fragment. |
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393 | */ |
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394 | if (ip->ip_off & IP_DF) { |
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395 | error = EMSGSIZE; |
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396 | /* |
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397 | * This case can happen if the user changed the MTU |
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398 | * of an interface after enabling IP on it. Because |
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399 | * most netifs don't keep track of routes pointing to |
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400 | * them, there is no way for one to update all its |
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401 | * routes when the MTU is changed. |
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402 | */ |
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403 | if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) |
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404 | && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) |
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405 | && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) { |
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406 | ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; |
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407 | } |
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408 | ipstat.ips_cantfrag++; |
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409 | goto bad; |
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410 | } |
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411 | len = (ifp->if_mtu - hlen) &~ 7; |
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412 | if (len < 8) { |
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413 | error = EMSGSIZE; |
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414 | goto bad; |
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415 | } |
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416 | |
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417 | { |
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418 | int mhlen, firstlen = len; |
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419 | struct mbuf **mnext = &m->m_nextpkt; |
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420 | |
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421 | /* |
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422 | * Loop through length of segment after first fragment, |
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423 | * make new header and copy data of each part and link onto chain. |
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424 | */ |
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425 | m0 = m; |
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426 | mhlen = sizeof (struct ip); |
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427 | for (off = hlen + len; off < (u_short)ip->ip_len; off += len) { |
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428 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
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429 | if (m == 0) { |
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430 | error = ENOBUFS; |
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431 | ipstat.ips_odropped++; |
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432 | goto sendorfree; |
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433 | } |
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434 | m->m_data += max_linkhdr; |
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435 | mhip = mtod(m, struct ip *); |
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436 | *mhip = *ip; |
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437 | if (hlen > sizeof (struct ip)) { |
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438 | mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); |
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439 | mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2); |
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440 | } |
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441 | m->m_len = mhlen; |
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442 | mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF); |
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443 | if (ip->ip_off & IP_MF) |
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444 | mhip->ip_off |= IP_MF; |
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445 | if (off + len >= (u_short)ip->ip_len) |
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446 | len = (u_short)ip->ip_len - off; |
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447 | else |
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448 | mhip->ip_off |= IP_MF; |
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449 | mhip->ip_len = htons((u_short)(len + mhlen)); |
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450 | m->m_next = m_copy(m0, off, len); |
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451 | if (m->m_next == 0) { |
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452 | (void) m_free(m); |
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453 | error = ENOBUFS; /* ??? */ |
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454 | ipstat.ips_odropped++; |
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455 | goto sendorfree; |
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456 | } |
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457 | m->m_pkthdr.len = mhlen + len; |
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458 | m->m_pkthdr.rcvif = (struct ifnet *)0; |
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459 | mhip->ip_off = htons((u_short)mhip->ip_off); |
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460 | mhip->ip_sum = 0; |
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461 | if (mhip->ip_vhl == IP_VHL_BORING) { |
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462 | mhip->ip_sum = in_cksum_hdr(mhip); |
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463 | } else { |
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464 | mhip->ip_sum = in_cksum(m, mhlen); |
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465 | } |
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466 | *mnext = m; |
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467 | mnext = &m->m_nextpkt; |
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468 | ipstat.ips_ofragments++; |
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469 | } |
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470 | /* |
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471 | * Update first fragment by trimming what's been copied out |
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472 | * and updating header, then send each fragment (in order). |
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473 | */ |
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474 | m = m0; |
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475 | m_adj(m, hlen + firstlen - (u_short)ip->ip_len); |
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476 | m->m_pkthdr.len = hlen + firstlen; |
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477 | ip->ip_len = htons((u_short)m->m_pkthdr.len); |
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478 | ip->ip_off = htons((u_short)(ip->ip_off | IP_MF)); |
---|
479 | ip->ip_sum = 0; |
---|
480 | if (ip->ip_vhl == IP_VHL_BORING) { |
---|
481 | ip->ip_sum = in_cksum_hdr(ip); |
---|
482 | } else { |
---|
483 | ip->ip_sum = in_cksum(m, hlen); |
---|
484 | } |
---|
485 | sendorfree: |
---|
486 | for (m = m0; m; m = m0) { |
---|
487 | m0 = m->m_nextpkt; |
---|
488 | m->m_nextpkt = 0; |
---|
489 | if (error == 0) |
---|
490 | error = (*ifp->if_output)(ifp, m, |
---|
491 | (struct sockaddr *)dst, ro->ro_rt); |
---|
492 | else |
---|
493 | m_freem(m); |
---|
494 | } |
---|
495 | |
---|
496 | if (error == 0) |
---|
497 | ipstat.ips_fragmented++; |
---|
498 | } |
---|
499 | done: |
---|
500 | return (error); |
---|
501 | bad: |
---|
502 | m_freem(m0); |
---|
503 | goto done; |
---|
504 | } |
---|
505 | |
---|
506 | /* |
---|
507 | * Insert IP options into preformed packet. |
---|
508 | * Adjust IP destination as required for IP source routing, |
---|
509 | * as indicated by a non-zero in_addr at the start of the options. |
---|
510 | * |
---|
511 | * XXX This routine assumes that the packet has no options in place. |
---|
512 | */ |
---|
513 | static struct mbuf * |
---|
514 | ip_insertoptions(m, opt, phlen) |
---|
515 | register struct mbuf *m; |
---|
516 | struct mbuf *opt; |
---|
517 | int *phlen; |
---|
518 | { |
---|
519 | register struct ipoption *p = mtod(opt, struct ipoption *); |
---|
520 | struct mbuf *n; |
---|
521 | register struct ip *ip = mtod(m, struct ip *); |
---|
522 | unsigned optlen; |
---|
523 | |
---|
524 | optlen = opt->m_len - sizeof(p->ipopt_dst); |
---|
525 | if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) |
---|
526 | return (m); /* XXX should fail */ |
---|
527 | if (p->ipopt_dst.s_addr) |
---|
528 | ip->ip_dst = p->ipopt_dst; |
---|
529 | if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { |
---|
530 | MGETHDR(n, M_DONTWAIT, MT_HEADER); |
---|
531 | if (n == 0) |
---|
532 | return (m); |
---|
533 | n->m_pkthdr.len = m->m_pkthdr.len + optlen; |
---|
534 | m->m_len -= sizeof(struct ip); |
---|
535 | m->m_data += sizeof(struct ip); |
---|
536 | n->m_next = m; |
---|
537 | m = n; |
---|
538 | m->m_len = optlen + sizeof(struct ip); |
---|
539 | m->m_data += max_linkhdr; |
---|
540 | (void)memcpy(mtod(m, void *), ip, sizeof(struct ip)); |
---|
541 | } else { |
---|
542 | m->m_data -= optlen; |
---|
543 | m->m_len += optlen; |
---|
544 | m->m_pkthdr.len += optlen; |
---|
545 | ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); |
---|
546 | } |
---|
547 | ip = mtod(m, struct ip *); |
---|
548 | bcopy(p->ipopt_list, ip + 1, optlen); |
---|
549 | *phlen = sizeof(struct ip) + optlen; |
---|
550 | ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2); |
---|
551 | ip->ip_len += optlen; |
---|
552 | return (m); |
---|
553 | } |
---|
554 | |
---|
555 | /* |
---|
556 | * Copy options from ip to jp, |
---|
557 | * omitting those not copied during fragmentation. |
---|
558 | */ |
---|
559 | static int |
---|
560 | ip_optcopy(ip, jp) |
---|
561 | struct ip *ip, *jp; |
---|
562 | { |
---|
563 | register u_char *cp, *dp; |
---|
564 | int opt, optlen, cnt; |
---|
565 | |
---|
566 | cp = (u_char *)(ip + 1); |
---|
567 | dp = (u_char *)(jp + 1); |
---|
568 | cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); |
---|
569 | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
---|
570 | opt = cp[0]; |
---|
571 | if (opt == IPOPT_EOL) |
---|
572 | break; |
---|
573 | if (opt == IPOPT_NOP) { |
---|
574 | /* Preserve for IP mcast tunnel's LSRR alignment. */ |
---|
575 | *dp++ = IPOPT_NOP; |
---|
576 | optlen = 1; |
---|
577 | continue; |
---|
578 | } else |
---|
579 | optlen = cp[IPOPT_OLEN]; |
---|
580 | /* bogus lengths should have been caught by ip_dooptions */ |
---|
581 | if (optlen > cnt) |
---|
582 | optlen = cnt; |
---|
583 | if (IPOPT_COPIED(opt)) { |
---|
584 | bcopy(cp, dp, optlen); |
---|
585 | dp += optlen; |
---|
586 | } |
---|
587 | } |
---|
588 | for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) |
---|
589 | *dp++ = IPOPT_EOL; |
---|
590 | return (optlen); |
---|
591 | } |
---|
592 | |
---|
593 | /* |
---|
594 | * IP socket option processing. |
---|
595 | */ |
---|
596 | int |
---|
597 | ip_ctloutput(op, so, level, optname, mp) |
---|
598 | int op; |
---|
599 | struct socket *so; |
---|
600 | int level, optname; |
---|
601 | struct mbuf **mp; |
---|
602 | { |
---|
603 | register struct inpcb *inp = sotoinpcb(so); |
---|
604 | register struct mbuf *m = *mp; |
---|
605 | register int optval = 0; |
---|
606 | int error = 0; |
---|
607 | |
---|
608 | if (level != IPPROTO_IP) { |
---|
609 | error = EINVAL; |
---|
610 | if (op == PRCO_SETOPT && *mp) |
---|
611 | (void) m_free(*mp); |
---|
612 | } else switch (op) { |
---|
613 | |
---|
614 | case PRCO_SETOPT: |
---|
615 | switch (optname) { |
---|
616 | case IP_OPTIONS: |
---|
617 | #ifdef notyet |
---|
618 | case IP_RETOPTS: |
---|
619 | return (ip_pcbopts(optname, &inp->inp_options, m)); |
---|
620 | #else |
---|
621 | return (ip_pcbopts(&inp->inp_options, m)); |
---|
622 | #endif |
---|
623 | |
---|
624 | case IP_TOS: |
---|
625 | case IP_TTL: |
---|
626 | case IP_RECVOPTS: |
---|
627 | case IP_RECVRETOPTS: |
---|
628 | case IP_RECVDSTADDR: |
---|
629 | case IP_RECVIF: |
---|
630 | if (m == 0 || m->m_len != sizeof(int)) |
---|
631 | error = EINVAL; |
---|
632 | else { |
---|
633 | optval = *mtod(m, int *); |
---|
634 | switch (optname) { |
---|
635 | |
---|
636 | case IP_TOS: |
---|
637 | inp->inp_ip_tos = optval; |
---|
638 | break; |
---|
639 | |
---|
640 | case IP_TTL: |
---|
641 | inp->inp_ip_ttl = optval; |
---|
642 | break; |
---|
643 | #define OPTSET(bit) \ |
---|
644 | if (optval) \ |
---|
645 | inp->inp_flags |= bit; \ |
---|
646 | else \ |
---|
647 | inp->inp_flags &= ~bit; |
---|
648 | |
---|
649 | case IP_RECVOPTS: |
---|
650 | OPTSET(INP_RECVOPTS); |
---|
651 | break; |
---|
652 | |
---|
653 | case IP_RECVRETOPTS: |
---|
654 | OPTSET(INP_RECVRETOPTS); |
---|
655 | break; |
---|
656 | |
---|
657 | case IP_RECVDSTADDR: |
---|
658 | OPTSET(INP_RECVDSTADDR); |
---|
659 | break; |
---|
660 | |
---|
661 | case IP_RECVIF: |
---|
662 | OPTSET(INP_RECVIF); |
---|
663 | break; |
---|
664 | } |
---|
665 | } |
---|
666 | break; |
---|
667 | #undef OPTSET |
---|
668 | |
---|
669 | case IP_MULTICAST_IF: |
---|
670 | case IP_MULTICAST_VIF: |
---|
671 | case IP_MULTICAST_TTL: |
---|
672 | case IP_MULTICAST_LOOP: |
---|
673 | case IP_ADD_MEMBERSHIP: |
---|
674 | case IP_DROP_MEMBERSHIP: |
---|
675 | error = ip_setmoptions(optname, &inp->inp_moptions, m); |
---|
676 | break; |
---|
677 | |
---|
678 | case IP_PORTRANGE: |
---|
679 | if (m == 0 || m->m_len != sizeof(int)) |
---|
680 | error = EINVAL; |
---|
681 | else { |
---|
682 | optval = *mtod(m, int *); |
---|
683 | |
---|
684 | switch (optval) { |
---|
685 | |
---|
686 | case IP_PORTRANGE_DEFAULT: |
---|
687 | inp->inp_flags &= ~(INP_LOWPORT); |
---|
688 | inp->inp_flags &= ~(INP_HIGHPORT); |
---|
689 | break; |
---|
690 | |
---|
691 | case IP_PORTRANGE_HIGH: |
---|
692 | inp->inp_flags &= ~(INP_LOWPORT); |
---|
693 | inp->inp_flags |= INP_HIGHPORT; |
---|
694 | break; |
---|
695 | |
---|
696 | case IP_PORTRANGE_LOW: |
---|
697 | inp->inp_flags &= ~(INP_HIGHPORT); |
---|
698 | inp->inp_flags |= INP_LOWPORT; |
---|
699 | break; |
---|
700 | |
---|
701 | default: |
---|
702 | error = EINVAL; |
---|
703 | break; |
---|
704 | } |
---|
705 | } |
---|
706 | break; |
---|
707 | |
---|
708 | default: |
---|
709 | error = ENOPROTOOPT; |
---|
710 | break; |
---|
711 | } |
---|
712 | if (m) |
---|
713 | (void)m_free(m); |
---|
714 | break; |
---|
715 | |
---|
716 | case PRCO_GETOPT: |
---|
717 | switch (optname) { |
---|
718 | case IP_OPTIONS: |
---|
719 | case IP_RETOPTS: |
---|
720 | *mp = m = m_get(M_WAIT, MT_SOOPTS); |
---|
721 | if (inp->inp_options) { |
---|
722 | m->m_len = inp->inp_options->m_len; |
---|
723 | bcopy(mtod(inp->inp_options, void *), |
---|
724 | mtod(m, void *), m->m_len); |
---|
725 | } else |
---|
726 | m->m_len = 0; |
---|
727 | break; |
---|
728 | |
---|
729 | case IP_TOS: |
---|
730 | case IP_TTL: |
---|
731 | case IP_RECVOPTS: |
---|
732 | case IP_RECVRETOPTS: |
---|
733 | case IP_RECVDSTADDR: |
---|
734 | case IP_RECVIF: |
---|
735 | *mp = m = m_get(M_WAIT, MT_SOOPTS); |
---|
736 | m->m_len = sizeof(int); |
---|
737 | switch (optname) { |
---|
738 | |
---|
739 | case IP_TOS: |
---|
740 | optval = inp->inp_ip_tos; |
---|
741 | break; |
---|
742 | |
---|
743 | case IP_TTL: |
---|
744 | optval = inp->inp_ip_ttl; |
---|
745 | break; |
---|
746 | |
---|
747 | #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) |
---|
748 | |
---|
749 | case IP_RECVOPTS: |
---|
750 | optval = OPTBIT(INP_RECVOPTS); |
---|
751 | break; |
---|
752 | |
---|
753 | case IP_RECVRETOPTS: |
---|
754 | optval = OPTBIT(INP_RECVRETOPTS); |
---|
755 | break; |
---|
756 | |
---|
757 | case IP_RECVDSTADDR: |
---|
758 | optval = OPTBIT(INP_RECVDSTADDR); |
---|
759 | break; |
---|
760 | |
---|
761 | case IP_RECVIF: |
---|
762 | optval = OPTBIT(INP_RECVIF); |
---|
763 | break; |
---|
764 | } |
---|
765 | *mtod(m, int *) = optval; |
---|
766 | break; |
---|
767 | |
---|
768 | case IP_MULTICAST_IF: |
---|
769 | case IP_MULTICAST_VIF: |
---|
770 | case IP_MULTICAST_TTL: |
---|
771 | case IP_MULTICAST_LOOP: |
---|
772 | case IP_ADD_MEMBERSHIP: |
---|
773 | case IP_DROP_MEMBERSHIP: |
---|
774 | error = ip_getmoptions(optname, inp->inp_moptions, mp); |
---|
775 | break; |
---|
776 | |
---|
777 | case IP_PORTRANGE: |
---|
778 | *mp = m = m_get(M_WAIT, MT_SOOPTS); |
---|
779 | m->m_len = sizeof(int); |
---|
780 | |
---|
781 | if (inp->inp_flags & INP_HIGHPORT) |
---|
782 | optval = IP_PORTRANGE_HIGH; |
---|
783 | else if (inp->inp_flags & INP_LOWPORT) |
---|
784 | optval = IP_PORTRANGE_LOW; |
---|
785 | else |
---|
786 | optval = 0; |
---|
787 | |
---|
788 | *mtod(m, int *) = optval; |
---|
789 | break; |
---|
790 | |
---|
791 | default: |
---|
792 | error = ENOPROTOOPT; |
---|
793 | break; |
---|
794 | } |
---|
795 | break; |
---|
796 | } |
---|
797 | return (error); |
---|
798 | } |
---|
799 | |
---|
800 | /* |
---|
801 | * Set up IP options in pcb for insertion in output packets. |
---|
802 | * Store in mbuf with pointer in pcbopt, adding pseudo-option |
---|
803 | * with destination address if source routed. |
---|
804 | */ |
---|
805 | static int |
---|
806 | #ifdef notyet |
---|
807 | ip_pcbopts(optname, pcbopt, m) |
---|
808 | int optname; |
---|
809 | #else |
---|
810 | ip_pcbopts(pcbopt, m) |
---|
811 | #endif |
---|
812 | struct mbuf **pcbopt; |
---|
813 | register struct mbuf *m; |
---|
814 | { |
---|
815 | register int cnt, optlen; |
---|
816 | register u_char *cp; |
---|
817 | u_char opt; |
---|
818 | |
---|
819 | /* turn off any old options */ |
---|
820 | if (*pcbopt) |
---|
821 | (void)m_free(*pcbopt); |
---|
822 | *pcbopt = 0; |
---|
823 | if (m == (struct mbuf *)0 || m->m_len == 0) { |
---|
824 | /* |
---|
825 | * Only turning off any previous options. |
---|
826 | */ |
---|
827 | if (m) |
---|
828 | (void)m_free(m); |
---|
829 | return (0); |
---|
830 | } |
---|
831 | |
---|
832 | #ifndef vax |
---|
833 | if (m->m_len % sizeof(long)) |
---|
834 | goto bad; |
---|
835 | #endif |
---|
836 | /* |
---|
837 | * IP first-hop destination address will be stored before |
---|
838 | * actual options; move other options back |
---|
839 | * and clear it when none present. |
---|
840 | */ |
---|
841 | if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) |
---|
842 | goto bad; |
---|
843 | cnt = m->m_len; |
---|
844 | m->m_len += sizeof(struct in_addr); |
---|
845 | cp = mtod(m, u_char *) + sizeof(struct in_addr); |
---|
846 | ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt); |
---|
847 | bzero(mtod(m, caddr_t), sizeof(struct in_addr)); |
---|
848 | |
---|
849 | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
---|
850 | opt = cp[IPOPT_OPTVAL]; |
---|
851 | if (opt == IPOPT_EOL) |
---|
852 | break; |
---|
853 | if (opt == IPOPT_NOP) |
---|
854 | optlen = 1; |
---|
855 | else { |
---|
856 | optlen = cp[IPOPT_OLEN]; |
---|
857 | if (optlen <= IPOPT_OLEN || optlen > cnt) |
---|
858 | goto bad; |
---|
859 | } |
---|
860 | switch (opt) { |
---|
861 | |
---|
862 | default: |
---|
863 | break; |
---|
864 | |
---|
865 | case IPOPT_LSRR: |
---|
866 | case IPOPT_SSRR: |
---|
867 | /* |
---|
868 | * user process specifies route as: |
---|
869 | * ->A->B->C->D |
---|
870 | * D must be our final destination (but we can't |
---|
871 | * check that since we may not have connected yet). |
---|
872 | * A is first hop destination, which doesn't appear in |
---|
873 | * actual IP option, but is stored before the options. |
---|
874 | */ |
---|
875 | if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) |
---|
876 | goto bad; |
---|
877 | m->m_len -= sizeof(struct in_addr); |
---|
878 | cnt -= sizeof(struct in_addr); |
---|
879 | optlen -= sizeof(struct in_addr); |
---|
880 | cp[IPOPT_OLEN] = optlen; |
---|
881 | /* |
---|
882 | * Move first hop before start of options. |
---|
883 | */ |
---|
884 | bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), |
---|
885 | sizeof(struct in_addr)); |
---|
886 | /* |
---|
887 | * Then copy rest of options back |
---|
888 | * to close up the deleted entry. |
---|
889 | */ |
---|
890 | ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] + |
---|
891 | sizeof(struct in_addr)), |
---|
892 | (caddr_t)&cp[IPOPT_OFFSET+1], |
---|
893 | (unsigned)cnt + sizeof(struct in_addr)); |
---|
894 | break; |
---|
895 | } |
---|
896 | } |
---|
897 | if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) |
---|
898 | goto bad; |
---|
899 | *pcbopt = m; |
---|
900 | return (0); |
---|
901 | |
---|
902 | bad: |
---|
903 | (void)m_free(m); |
---|
904 | return (EINVAL); |
---|
905 | } |
---|
906 | |
---|
907 | /* |
---|
908 | * Set the IP multicast options in response to user setsockopt(). |
---|
909 | */ |
---|
910 | static int |
---|
911 | ip_setmoptions(optname, imop, m) |
---|
912 | int optname; |
---|
913 | struct ip_moptions **imop; |
---|
914 | struct mbuf *m; |
---|
915 | { |
---|
916 | register int error = 0; |
---|
917 | u_char loop; |
---|
918 | register int i; |
---|
919 | struct in_addr addr; |
---|
920 | register struct ip_mreq *mreq; |
---|
921 | register struct ifnet *ifp; |
---|
922 | register struct ip_moptions *imo = *imop; |
---|
923 | struct route ro; |
---|
924 | register struct sockaddr_in *dst; |
---|
925 | int s; |
---|
926 | |
---|
927 | if (imo == NULL) { |
---|
928 | /* |
---|
929 | * No multicast option buffer attached to the pcb; |
---|
930 | * allocate one and initialize to default values. |
---|
931 | */ |
---|
932 | imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, |
---|
933 | M_WAITOK); |
---|
934 | |
---|
935 | if (imo == NULL) |
---|
936 | return (ENOBUFS); |
---|
937 | *imop = imo; |
---|
938 | imo->imo_multicast_ifp = NULL; |
---|
939 | imo->imo_multicast_vif = -1; |
---|
940 | imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; |
---|
941 | imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; |
---|
942 | imo->imo_num_memberships = 0; |
---|
943 | } |
---|
944 | |
---|
945 | switch (optname) { |
---|
946 | /* store an index number for the vif you wanna use in the send */ |
---|
947 | case IP_MULTICAST_VIF: |
---|
948 | if (!legal_vif_num) { |
---|
949 | error = EOPNOTSUPP; |
---|
950 | break; |
---|
951 | } |
---|
952 | if (m == NULL || m->m_len != sizeof(int)) { |
---|
953 | error = EINVAL; |
---|
954 | break; |
---|
955 | } |
---|
956 | i = *(mtod(m, int *)); |
---|
957 | if (!legal_vif_num(i) && (i != -1)) { |
---|
958 | error = EINVAL; |
---|
959 | break; |
---|
960 | } |
---|
961 | imo->imo_multicast_vif = i; |
---|
962 | break; |
---|
963 | |
---|
964 | case IP_MULTICAST_IF: |
---|
965 | /* |
---|
966 | * Select the interface for outgoing multicast packets. |
---|
967 | */ |
---|
968 | if (m == NULL || m->m_len != sizeof(struct in_addr)) { |
---|
969 | error = EINVAL; |
---|
970 | break; |
---|
971 | } |
---|
972 | addr = *(mtod(m, struct in_addr *)); |
---|
973 | /* |
---|
974 | * INADDR_ANY is used to remove a previous selection. |
---|
975 | * When no interface is selected, a default one is |
---|
976 | * chosen every time a multicast packet is sent. |
---|
977 | */ |
---|
978 | if (addr.s_addr == INADDR_ANY) { |
---|
979 | imo->imo_multicast_ifp = NULL; |
---|
980 | break; |
---|
981 | } |
---|
982 | /* |
---|
983 | * The selected interface is identified by its local |
---|
984 | * IP address. Find the interface and confirm that |
---|
985 | * it supports multicasting. |
---|
986 | */ |
---|
987 | s = splimp(); |
---|
988 | INADDR_TO_IFP(addr, ifp); |
---|
989 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { |
---|
990 | splx(s); |
---|
991 | error = EADDRNOTAVAIL; |
---|
992 | break; |
---|
993 | } |
---|
994 | imo->imo_multicast_ifp = ifp; |
---|
995 | splx(s); |
---|
996 | break; |
---|
997 | |
---|
998 | case IP_MULTICAST_TTL: |
---|
999 | /* |
---|
1000 | * Set the IP time-to-live for outgoing multicast packets. |
---|
1001 | */ |
---|
1002 | if (m == NULL || m->m_len != 1) { |
---|
1003 | error = EINVAL; |
---|
1004 | break; |
---|
1005 | } |
---|
1006 | imo->imo_multicast_ttl = *(mtod(m, u_char *)); |
---|
1007 | break; |
---|
1008 | |
---|
1009 | case IP_MULTICAST_LOOP: |
---|
1010 | /* |
---|
1011 | * Set the loopback flag for outgoing multicast packets. |
---|
1012 | * Must be zero or one. |
---|
1013 | */ |
---|
1014 | if (m == NULL || m->m_len != 1 || |
---|
1015 | (loop = *(mtod(m, u_char *))) > 1) { |
---|
1016 | error = EINVAL; |
---|
1017 | break; |
---|
1018 | } |
---|
1019 | imo->imo_multicast_loop = loop; |
---|
1020 | break; |
---|
1021 | |
---|
1022 | case IP_ADD_MEMBERSHIP: |
---|
1023 | /* |
---|
1024 | * Add a multicast group membership. |
---|
1025 | * Group must be a valid IP multicast address. |
---|
1026 | */ |
---|
1027 | if (m == NULL || m->m_len != sizeof(struct ip_mreq)) { |
---|
1028 | error = EINVAL; |
---|
1029 | break; |
---|
1030 | } |
---|
1031 | mreq = mtod(m, struct ip_mreq *); |
---|
1032 | if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { |
---|
1033 | error = EINVAL; |
---|
1034 | break; |
---|
1035 | } |
---|
1036 | s = splimp(); |
---|
1037 | /* |
---|
1038 | * If no interface address was provided, use the interface of |
---|
1039 | * the route to the given multicast address. |
---|
1040 | */ |
---|
1041 | if (mreq->imr_interface.s_addr == INADDR_ANY) { |
---|
1042 | bzero((caddr_t)&ro, sizeof(ro)); |
---|
1043 | dst = (struct sockaddr_in *)&ro.ro_dst; |
---|
1044 | dst->sin_len = sizeof(*dst); |
---|
1045 | dst->sin_family = AF_INET; |
---|
1046 | dst->sin_addr = mreq->imr_multiaddr; |
---|
1047 | rtalloc(&ro); |
---|
1048 | if (ro.ro_rt == NULL) { |
---|
1049 | error = EADDRNOTAVAIL; |
---|
1050 | splx(s); |
---|
1051 | break; |
---|
1052 | } |
---|
1053 | ifp = ro.ro_rt->rt_ifp; |
---|
1054 | rtfree(ro.ro_rt); |
---|
1055 | } |
---|
1056 | else { |
---|
1057 | INADDR_TO_IFP(mreq->imr_interface, ifp); |
---|
1058 | } |
---|
1059 | |
---|
1060 | /* |
---|
1061 | * See if we found an interface, and confirm that it |
---|
1062 | * supports multicast. |
---|
1063 | */ |
---|
1064 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { |
---|
1065 | error = EADDRNOTAVAIL; |
---|
1066 | splx(s); |
---|
1067 | break; |
---|
1068 | } |
---|
1069 | /* |
---|
1070 | * See if the membership already exists or if all the |
---|
1071 | * membership slots are full. |
---|
1072 | */ |
---|
1073 | for (i = 0; i < imo->imo_num_memberships; ++i) { |
---|
1074 | if (imo->imo_membership[i]->inm_ifp == ifp && |
---|
1075 | imo->imo_membership[i]->inm_addr.s_addr |
---|
1076 | == mreq->imr_multiaddr.s_addr) |
---|
1077 | break; |
---|
1078 | } |
---|
1079 | if (i < imo->imo_num_memberships) { |
---|
1080 | error = EADDRINUSE; |
---|
1081 | splx(s); |
---|
1082 | break; |
---|
1083 | } |
---|
1084 | if (i == IP_MAX_MEMBERSHIPS) { |
---|
1085 | error = ETOOMANYREFS; |
---|
1086 | splx(s); |
---|
1087 | break; |
---|
1088 | } |
---|
1089 | /* |
---|
1090 | * Everything looks good; add a new record to the multicast |
---|
1091 | * address list for the given interface. |
---|
1092 | */ |
---|
1093 | if ((imo->imo_membership[i] = |
---|
1094 | in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) { |
---|
1095 | error = ENOBUFS; |
---|
1096 | splx(s); |
---|
1097 | break; |
---|
1098 | } |
---|
1099 | ++imo->imo_num_memberships; |
---|
1100 | splx(s); |
---|
1101 | break; |
---|
1102 | |
---|
1103 | case IP_DROP_MEMBERSHIP: |
---|
1104 | /* |
---|
1105 | * Drop a multicast group membership. |
---|
1106 | * Group must be a valid IP multicast address. |
---|
1107 | */ |
---|
1108 | if (m == NULL || m->m_len != sizeof(struct ip_mreq)) { |
---|
1109 | error = EINVAL; |
---|
1110 | break; |
---|
1111 | } |
---|
1112 | mreq = mtod(m, struct ip_mreq *); |
---|
1113 | if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { |
---|
1114 | error = EINVAL; |
---|
1115 | break; |
---|
1116 | } |
---|
1117 | |
---|
1118 | s = splimp(); |
---|
1119 | /* |
---|
1120 | * If an interface address was specified, get a pointer |
---|
1121 | * to its ifnet structure. |
---|
1122 | */ |
---|
1123 | if (mreq->imr_interface.s_addr == INADDR_ANY) |
---|
1124 | ifp = NULL; |
---|
1125 | else { |
---|
1126 | INADDR_TO_IFP(mreq->imr_interface, ifp); |
---|
1127 | if (ifp == NULL) { |
---|
1128 | error = EADDRNOTAVAIL; |
---|
1129 | splx(s); |
---|
1130 | break; |
---|
1131 | } |
---|
1132 | } |
---|
1133 | /* |
---|
1134 | * Find the membership in the membership array. |
---|
1135 | */ |
---|
1136 | for (i = 0; i < imo->imo_num_memberships; ++i) { |
---|
1137 | if ((ifp == NULL || |
---|
1138 | imo->imo_membership[i]->inm_ifp == ifp) && |
---|
1139 | imo->imo_membership[i]->inm_addr.s_addr == |
---|
1140 | mreq->imr_multiaddr.s_addr) |
---|
1141 | break; |
---|
1142 | } |
---|
1143 | if (i == imo->imo_num_memberships) { |
---|
1144 | error = EADDRNOTAVAIL; |
---|
1145 | splx(s); |
---|
1146 | break; |
---|
1147 | } |
---|
1148 | /* |
---|
1149 | * Give up the multicast address record to which the |
---|
1150 | * membership points. |
---|
1151 | */ |
---|
1152 | in_delmulti(imo->imo_membership[i]); |
---|
1153 | /* |
---|
1154 | * Remove the gap in the membership array. |
---|
1155 | */ |
---|
1156 | for (++i; i < imo->imo_num_memberships; ++i) |
---|
1157 | imo->imo_membership[i-1] = imo->imo_membership[i]; |
---|
1158 | --imo->imo_num_memberships; |
---|
1159 | splx(s); |
---|
1160 | break; |
---|
1161 | |
---|
1162 | default: |
---|
1163 | error = EOPNOTSUPP; |
---|
1164 | break; |
---|
1165 | } |
---|
1166 | |
---|
1167 | /* |
---|
1168 | * If all options have default values, no need to keep the mbuf. |
---|
1169 | */ |
---|
1170 | if (imo->imo_multicast_ifp == NULL && |
---|
1171 | imo->imo_multicast_vif == -1 && |
---|
1172 | imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && |
---|
1173 | imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && |
---|
1174 | imo->imo_num_memberships == 0) { |
---|
1175 | free(*imop, M_IPMOPTS); |
---|
1176 | *imop = NULL; |
---|
1177 | } |
---|
1178 | |
---|
1179 | return (error); |
---|
1180 | } |
---|
1181 | |
---|
1182 | /* |
---|
1183 | * Return the IP multicast options in response to user getsockopt(). |
---|
1184 | */ |
---|
1185 | static int |
---|
1186 | ip_getmoptions(optname, imo, mp) |
---|
1187 | int optname; |
---|
1188 | register struct ip_moptions *imo; |
---|
1189 | register struct mbuf **mp; |
---|
1190 | { |
---|
1191 | u_char *ttl; |
---|
1192 | u_char *loop; |
---|
1193 | struct in_addr *addr; |
---|
1194 | struct in_ifaddr *ia; |
---|
1195 | |
---|
1196 | *mp = m_get(M_WAIT, MT_SOOPTS); |
---|
1197 | |
---|
1198 | switch (optname) { |
---|
1199 | |
---|
1200 | case IP_MULTICAST_VIF: |
---|
1201 | if (imo != NULL) |
---|
1202 | *(mtod(*mp, int *)) = imo->imo_multicast_vif; |
---|
1203 | else |
---|
1204 | *(mtod(*mp, int *)) = -1; |
---|
1205 | (*mp)->m_len = sizeof(int); |
---|
1206 | return(0); |
---|
1207 | |
---|
1208 | case IP_MULTICAST_IF: |
---|
1209 | addr = mtod(*mp, struct in_addr *); |
---|
1210 | (*mp)->m_len = sizeof(struct in_addr); |
---|
1211 | if (imo == NULL || imo->imo_multicast_ifp == NULL) |
---|
1212 | addr->s_addr = INADDR_ANY; |
---|
1213 | else { |
---|
1214 | IFP_TO_IA(imo->imo_multicast_ifp, ia); |
---|
1215 | addr->s_addr = (ia == NULL) ? INADDR_ANY |
---|
1216 | : IA_SIN(ia)->sin_addr.s_addr; |
---|
1217 | } |
---|
1218 | return (0); |
---|
1219 | |
---|
1220 | case IP_MULTICAST_TTL: |
---|
1221 | ttl = mtod(*mp, u_char *); |
---|
1222 | (*mp)->m_len = 1; |
---|
1223 | *ttl = (imo == NULL) ? IP_DEFAULT_MULTICAST_TTL |
---|
1224 | : imo->imo_multicast_ttl; |
---|
1225 | return (0); |
---|
1226 | |
---|
1227 | case IP_MULTICAST_LOOP: |
---|
1228 | loop = mtod(*mp, u_char *); |
---|
1229 | (*mp)->m_len = 1; |
---|
1230 | *loop = (imo == NULL) ? IP_DEFAULT_MULTICAST_LOOP |
---|
1231 | : imo->imo_multicast_loop; |
---|
1232 | return (0); |
---|
1233 | |
---|
1234 | default: |
---|
1235 | return (EOPNOTSUPP); |
---|
1236 | } |
---|
1237 | } |
---|
1238 | |
---|
1239 | /* |
---|
1240 | * Discard the IP multicast options. |
---|
1241 | */ |
---|
1242 | void |
---|
1243 | ip_freemoptions(imo) |
---|
1244 | register struct ip_moptions *imo; |
---|
1245 | { |
---|
1246 | register int i; |
---|
1247 | |
---|
1248 | if (imo != NULL) { |
---|
1249 | for (i = 0; i < imo->imo_num_memberships; ++i) |
---|
1250 | in_delmulti(imo->imo_membership[i]); |
---|
1251 | free(imo, M_IPMOPTS); |
---|
1252 | } |
---|
1253 | } |
---|
1254 | |
---|
1255 | /* |
---|
1256 | * Routine called from ip_output() to loop back a copy of an IP multicast |
---|
1257 | * packet to the input queue of a specified interface. Note that this |
---|
1258 | * calls the output routine of the loopback "driver", but with an interface |
---|
1259 | * pointer that might NOT be a loopback interface -- evil, but easier than |
---|
1260 | * replicating that code here. |
---|
1261 | */ |
---|
1262 | static void |
---|
1263 | ip_mloopback(ifp, m, dst, hlen) |
---|
1264 | struct ifnet *ifp; |
---|
1265 | register struct mbuf *m; |
---|
1266 | register struct sockaddr_in *dst; |
---|
1267 | int hlen; |
---|
1268 | { |
---|
1269 | register struct ip *ip; |
---|
1270 | struct mbuf *copym; |
---|
1271 | |
---|
1272 | copym = m_copy(m, 0, M_COPYALL); |
---|
1273 | if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) |
---|
1274 | copym = m_pullup(copym, hlen); |
---|
1275 | if (copym != NULL) { |
---|
1276 | /* |
---|
1277 | * We don't bother to fragment if the IP length is greater |
---|
1278 | * than the interface's MTU. Can this possibly matter? |
---|
1279 | */ |
---|
1280 | ip = mtod(copym, struct ip *); |
---|
1281 | ip->ip_len = htons((u_short)ip->ip_len); |
---|
1282 | ip->ip_off = htons((u_short)ip->ip_off); |
---|
1283 | ip->ip_sum = 0; |
---|
1284 | if (ip->ip_vhl == IP_VHL_BORING) { |
---|
1285 | ip->ip_sum = in_cksum_hdr(ip); |
---|
1286 | } else { |
---|
1287 | ip->ip_sum = in_cksum(copym, hlen); |
---|
1288 | } |
---|
1289 | /* |
---|
1290 | * NB: |
---|
1291 | * It's not clear whether there are any lingering |
---|
1292 | * reentrancy problems in other areas which might |
---|
1293 | * be exposed by using ip_input directly (in |
---|
1294 | * particular, everything which modifies the packet |
---|
1295 | * in-place). Yet another option is using the |
---|
1296 | * protosw directly to deliver the looped back |
---|
1297 | * packet. For the moment, we'll err on the side |
---|
1298 | * of safety by continuing to abuse looutput(). |
---|
1299 | */ |
---|
1300 | #ifdef notdef |
---|
1301 | copym->m_pkthdr.rcvif = ifp; |
---|
1302 | ip_input(copym) |
---|
1303 | #else |
---|
1304 | (void) looutput(ifp, copym, (struct sockaddr *)dst, NULL); |
---|
1305 | #endif |
---|
1306 | } |
---|
1307 | } |
---|