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 | * 4. Neither the name of the University nor the names of its contributors |
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14 | * may be used to endorse or promote products derived from this software |
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15 | * without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 | * SUCH DAMAGE. |
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28 | * |
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29 | * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 |
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30 | * $FreeBSD: src/sys/netinet/ip_output.c,v 1.271 2007/03/23 09:43:36 bms Exp $ |
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31 | */ |
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32 | |
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33 | |
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34 | #ifdef HAVE_CONFIG_H |
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35 | #include "config.h" |
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36 | #endif |
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37 | |
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38 | #define _IP_VHL |
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39 | |
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40 | #include <sys/param.h> |
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41 | #include <sys/queue.h> |
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42 | #include <sys/systm.h> |
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43 | #include <sys/malloc.h> |
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44 | #include <sys/mbuf.h> |
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45 | #include <errno.h> |
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46 | #include <sys/protosw.h> |
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47 | #include <sys/socket.h> |
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48 | #include <sys/socketvar.h> |
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49 | |
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50 | #include <net/if.h> |
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51 | #include <net/route.h> |
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52 | |
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53 | #include <netinet/in.h> |
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54 | #include <rtems/rtems_netinet_in.h> |
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55 | #include <netinet/in_systm.h> |
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56 | #include <netinet/ip.h> |
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57 | #include <netinet/in_pcb.h> |
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58 | #include <netinet/in_var.h> |
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59 | #include <netinet/ip_var.h> |
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60 | |
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61 | #include <machine/in_cksum.h> |
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62 | |
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63 | #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 |
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64 | #undef COMPAT_IPFW |
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65 | #define COMPAT_IPFW 1 |
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66 | #else |
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67 | #undef COMPAT_IPFW |
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68 | #endif |
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69 | |
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70 | u_short ip_id; |
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71 | |
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72 | static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *); |
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73 | static void ip_mloopback |
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74 | (struct ifnet *, struct mbuf *, struct sockaddr_in *, int); |
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75 | static int ip_getmoptions |
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76 | (int, struct ip_moptions *, struct mbuf **); |
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77 | static int ip_optcopy(struct ip *, struct ip *); |
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78 | static int ip_pcbopts(struct mbuf **, struct mbuf *); |
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79 | static int ip_setmoptions |
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80 | (int, struct ip_moptions **, struct mbuf *); |
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81 | |
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82 | extern struct protosw inetsw[]; |
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83 | |
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84 | /* |
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85 | * IP output. The packet in mbuf chain m contains a skeletal IP |
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86 | * header (with len, off, ttl, proto, tos, src, dst). |
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87 | * The mbuf chain containing the packet will be freed. |
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88 | * The mbuf opt, if present, will not be freed. |
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89 | */ |
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90 | int |
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91 | ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags, |
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92 | struct ip_moptions *imo) |
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93 | { |
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94 | struct ip *ip, *mhip; |
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95 | struct ifnet *ifp; |
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96 | struct mbuf *m = m0; |
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97 | int hlen = sizeof (struct ip); |
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98 | int len = 0, off, error = 0; |
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99 | struct sockaddr_in *dst; |
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100 | struct in_ifaddr *ia; |
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101 | int isbroadcast; |
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102 | |
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103 | #ifdef DIAGNOSTIC |
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104 | if ((m->m_flags & M_PKTHDR) == 0) |
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105 | panic("ip_output no HDR"); |
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106 | if (!ro) |
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107 | panic("ip_output no route, proto = %d", |
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108 | mtod(m, struct ip *)->ip_p); |
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109 | #endif |
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110 | if (opt) { |
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111 | m = ip_insertoptions(m, opt, &len); |
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112 | hlen = len; |
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113 | } |
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114 | ip = mtod(m, struct ip *); |
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115 | /* |
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116 | * Fill in IP header. |
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117 | */ |
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118 | if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { |
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119 | #ifdef _IP_VHL |
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120 | ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2); |
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121 | #else |
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122 | ip->ip_v = IPVERSION; |
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123 | ip->ip_hl = hlen >> 2; |
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124 | #endif |
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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 | #ifdef _IP_VHL |
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130 | hlen = IP_VHL_HL(ip->ip_vhl) << 2; |
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131 | #else |
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132 | hlen = ip->ip_hl << 2; |
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133 | #endif |
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134 | } |
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135 | |
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136 | dst = (struct sockaddr_in *)&ro->ro_dst; |
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137 | /* |
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138 | * If there is a cached route, |
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139 | * check that it is to the same destination |
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140 | * and is still up. If not, free it and try again. |
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141 | */ |
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142 | if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || |
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143 | dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { |
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144 | RTFREE(ro->ro_rt); |
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145 | ro->ro_rt = (struct rtentry *)0; |
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146 | } |
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147 | if (ro->ro_rt == NULL) { |
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148 | dst->sin_family = AF_INET; |
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149 | dst->sin_len = sizeof(*dst); |
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150 | dst->sin_addr = ip->ip_dst; |
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151 | } |
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152 | /* |
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153 | * If routing to interface only, |
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154 | * short circuit routing lookup. |
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155 | */ |
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156 | #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) |
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157 | #define sintosa(sin) ((struct sockaddr *)(sin)) |
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158 | if (flags & IP_ROUTETOIF) { |
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159 | if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 && |
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160 | (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) { |
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161 | ipstat.ips_noroute++; |
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162 | error = ENETUNREACH; |
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163 | goto bad; |
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164 | } |
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165 | ifp = ia->ia_ifp; |
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166 | ip->ip_ttl = 1; |
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167 | isbroadcast = in_broadcast(dst->sin_addr, ifp); |
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168 | } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && |
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169 | imo != NULL && imo->imo_multicast_ifp != NULL) { |
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170 | /* |
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171 | * Bypass the normal routing lookup for multicast |
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172 | * packets if the interface is specified. |
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173 | */ |
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174 | ifp = imo->imo_multicast_ifp; |
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175 | IFP_TO_IA(ifp, ia); |
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176 | isbroadcast = 0; /* fool gcc */ |
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177 | } else { |
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178 | /* |
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179 | * If this is the case, we probably don't want to allocate |
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180 | * a protocol-cloned route since we didn't get one from the |
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181 | * ULP. This lets TCP do its thing, while not burdening |
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182 | * forwarding or ICMP with the overhead of cloning a route. |
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183 | * Of course, we still want to do any cloning requested by |
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184 | * the link layer, as this is probably required in all cases |
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185 | * for correct operation (as it is for ARP). |
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186 | */ |
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187 | if (ro->ro_rt == 0) |
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188 | rtalloc_ign(ro, RTF_PRCLONING); |
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189 | if (ro->ro_rt == 0) { |
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190 | ipstat.ips_noroute++; |
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191 | error = EHOSTUNREACH; |
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192 | goto bad; |
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193 | } |
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194 | ia = ifatoia(ro->ro_rt->rt_ifa); |
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195 | ifp = ro->ro_rt->rt_ifp; |
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196 | ro->ro_rt->rt_use++; |
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197 | if (ro->ro_rt->rt_flags & RTF_GATEWAY) |
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198 | dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; |
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199 | if (ro->ro_rt->rt_flags & RTF_HOST) |
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200 | isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); |
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201 | else |
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202 | isbroadcast = in_broadcast(dst->sin_addr, ifp); |
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203 | } |
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204 | if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { |
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205 | struct in_multi *inm; |
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206 | |
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207 | m->m_flags |= M_MCAST; |
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208 | /* |
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209 | * IP destination address is multicast. Make sure "dst" |
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210 | * still points to the address in "ro". (It may have been |
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211 | * changed to point to a gateway address, above.) |
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212 | */ |
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213 | dst = (struct sockaddr_in *)&ro->ro_dst; |
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214 | /* |
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215 | * See if the caller provided any multicast options |
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216 | */ |
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217 | if (imo != NULL) { |
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218 | ip->ip_ttl = imo->imo_multicast_ttl; |
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219 | if (imo->imo_multicast_ifp != NULL) |
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220 | ifp = imo->imo_multicast_ifp; |
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221 | if (imo->imo_multicast_vif != -1) |
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222 | ip->ip_src.s_addr = |
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223 | ip_mcast_src(imo->imo_multicast_vif); |
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224 | } else |
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225 | ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; |
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226 | /* |
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227 | * Confirm that the outgoing interface supports multicast. |
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228 | */ |
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229 | if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { |
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230 | if ((ifp->if_flags & IFF_MULTICAST) == 0) { |
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231 | ipstat.ips_noroute++; |
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232 | error = ENETUNREACH; |
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233 | goto bad; |
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234 | } |
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235 | } |
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236 | /* |
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237 | * If source address not specified yet, use address |
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238 | * of outgoing interface. |
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239 | */ |
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240 | if (ip->ip_src.s_addr == INADDR_ANY) { |
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241 | register struct in_ifaddr *ia; |
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242 | |
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243 | for (ia = in_ifaddr; ia; ia = ia->ia_next) |
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244 | if (ia->ia_ifp == ifp) { |
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245 | ip->ip_src = IA_SIN(ia)->sin_addr; |
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246 | break; |
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247 | } |
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248 | } |
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249 | |
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250 | IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm); |
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251 | if (inm != NULL && |
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252 | (imo == NULL || imo->imo_multicast_loop)) { |
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253 | /* |
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254 | * If we belong to the destination multicast group |
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255 | * on the outgoing interface, and the caller did not |
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256 | * forbid loopback, loop back a copy. |
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257 | */ |
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258 | ip_mloopback(ifp, m, dst, hlen); |
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259 | } |
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260 | else { |
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261 | /* |
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262 | * If we are acting as a multicast router, perform |
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263 | * multicast forwarding as if the packet had just |
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264 | * arrived on the interface to which we are about |
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265 | * to send. The multicast forwarding function |
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266 | * recursively calls this function, using the |
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267 | * IP_FORWARDING flag to prevent infinite recursion. |
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268 | * |
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269 | * Multicasts that are looped back by ip_mloopback(), |
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270 | * above, will be forwarded by the ip_input() routine, |
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271 | * if necessary. |
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272 | */ |
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273 | if (ip_mrouter && (flags & IP_FORWARDING) == 0) { |
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274 | /* |
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275 | * Check if rsvp daemon is running. If not, don't |
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276 | * set ip_moptions. This ensures that the packet |
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277 | * is multicast and not just sent down one link |
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278 | * as prescribed by rsvpd. |
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279 | */ |
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280 | if (!rsvp_on) |
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281 | imo = NULL; |
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282 | if (ip_mforward(ip, ifp, m, imo) != 0) { |
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283 | m_freem(m); |
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284 | goto done; |
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285 | } |
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286 | } |
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287 | } |
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288 | |
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289 | /* |
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290 | * Multicasts with a time-to-live of zero may be looped- |
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291 | * back, above, but must not be transmitted on a network. |
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292 | * Also, multicasts addressed to the loopback interface |
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293 | * are not sent -- the above call to ip_mloopback() will |
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294 | * loop back a copy if this host actually belongs to the |
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295 | * destination group on the loopback interface. |
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296 | */ |
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297 | if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { |
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298 | m_freem(m); |
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299 | goto done; |
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300 | } |
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301 | |
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302 | goto sendit; |
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303 | } |
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304 | #ifndef notdef |
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305 | /* |
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306 | * If source address not specified yet, use address |
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307 | * of outgoing interface. |
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308 | */ |
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309 | if (ip->ip_src.s_addr == INADDR_ANY) |
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310 | ip->ip_src = IA_SIN(ia)->sin_addr; |
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311 | #endif |
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312 | /* |
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313 | * Verify that we have any chance at all of being able to queue |
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314 | * the packet or packet fragments |
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315 | */ |
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316 | if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >= |
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317 | ifp->if_snd.ifq_maxlen) { |
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318 | error = ENOBUFS; |
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319 | goto bad; |
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320 | } |
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321 | |
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322 | /* |
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323 | * Look for broadcast address and |
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324 | * verify user is allowed to send |
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325 | * such a packet. |
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326 | */ |
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327 | if (isbroadcast) { |
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328 | if ((ifp->if_flags & IFF_BROADCAST) == 0) { |
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329 | error = EADDRNOTAVAIL; |
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330 | goto bad; |
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331 | } |
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332 | if ((flags & IP_ALLOWBROADCAST) == 0) { |
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333 | error = EACCES; |
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334 | goto bad; |
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335 | } |
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336 | /* don't allow broadcast messages to be fragmented */ |
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337 | if (ip->ip_len > ifp->if_mtu) { |
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338 | error = EMSGSIZE; |
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339 | goto bad; |
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340 | } |
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341 | m->m_flags |= M_BCAST; |
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342 | } else { |
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343 | m->m_flags &= ~M_BCAST; |
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344 | } |
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345 | |
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346 | sendit: |
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347 | /* |
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348 | * IpHack's section. |
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349 | * - Xlate: translate packet's addr/port (NAT). |
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350 | * - Firewall: deny/allow/etc. |
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351 | * - Wrap: fake packet's addr/port <unimpl.> |
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352 | * - Encapsulate: put it in another IP and send out. <unimp.> |
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353 | */ |
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354 | |
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355 | #ifdef COMPAT_IPFW |
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356 | if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, ifp, IP_NAT_OUT)) { |
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357 | error = EACCES; |
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358 | goto done; |
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359 | } |
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360 | |
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361 | /* |
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362 | * Check with the firewall... |
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363 | */ |
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364 | if (ip_fw_chk_ptr) { |
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365 | #ifdef IPDIVERT |
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366 | ip_divert_port = (*ip_fw_chk_ptr)(&ip, |
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367 | hlen, ifp, ip_divert_ignore, &m); |
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368 | ip_divert_ignore = 0; |
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369 | if (ip_divert_port) { /* Divert packet */ |
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370 | (*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, 0); |
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371 | goto done; |
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372 | } |
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373 | #else |
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374 | /* If ipfw says divert, we have to just drop packet */ |
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375 | if ((*ip_fw_chk_ptr)(&ip, hlen, ifp, 0, &m)) { |
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376 | m_freem(m); |
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377 | goto done; |
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378 | } |
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379 | #endif |
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380 | if (!m) { |
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381 | error = EACCES; |
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382 | goto done; |
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383 | } |
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384 | } |
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385 | #endif /* COMPAT_IPFW */ |
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386 | |
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387 | /* |
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388 | * If small enough for interface, or the interface will take |
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389 | * care of the fragmentation for us, we can just send directly. |
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390 | */ |
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391 | if ((u_short)ip->ip_len <= ifp->if_mtu) { |
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392 | ip->ip_len = htons(ip->ip_len); |
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393 | ip->ip_off = htons(ip->ip_off); |
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394 | ip->ip_sum = 0; |
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395 | #ifdef _IP_VHL |
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396 | if (ip->ip_vhl == IP_VHL_BORING) { |
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397 | #else |
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398 | if ((ip->ip_hl == 5) && (ip->ip_v = IPVERSION)) { |
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399 | #endif |
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400 | ip->ip_sum = in_cksum_hdr(ip); |
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401 | } else { |
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402 | ip->ip_sum = in_cksum(m, hlen); |
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403 | } |
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404 | error = (*ifp->if_output)(ifp, m, |
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405 | (struct sockaddr *)dst, ro->ro_rt); |
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406 | goto done; |
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407 | } |
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408 | /* |
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409 | * Too large for interface; fragment if possible. |
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410 | * Must be able to put at least 8 bytes per fragment. |
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411 | */ |
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412 | if (ip->ip_off & IP_DF) { |
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413 | error = EMSGSIZE; |
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414 | /* |
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415 | * This case can happen if the user changed the MTU |
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416 | * of an interface after enabling IP on it. Because |
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417 | * most netifs don't keep track of routes pointing to |
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418 | * them, there is no way for one to update all its |
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419 | * routes when the MTU is changed. |
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420 | */ |
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421 | if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) |
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422 | && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) |
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423 | && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) { |
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424 | ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; |
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425 | } |
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426 | ipstat.ips_cantfrag++; |
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427 | goto bad; |
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428 | } |
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429 | len = (ifp->if_mtu - hlen) &~ 7; |
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430 | if (len < 8) { |
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431 | error = EMSGSIZE; |
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432 | goto bad; |
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433 | } |
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434 | |
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435 | { |
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436 | int mhlen, firstlen = len; |
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437 | struct mbuf **mnext = &m->m_nextpkt; |
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438 | |
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439 | /* |
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440 | * Loop through length of segment after first fragment, |
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441 | * make new header and copy data of each part and link onto chain. |
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442 | */ |
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443 | m0 = m; |
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444 | mhlen = sizeof (struct ip); |
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445 | for (off = hlen + len; off < (u_short)ip->ip_len; off += len) { |
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446 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
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447 | if (m == 0) { |
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448 | error = ENOBUFS; |
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449 | ipstat.ips_odropped++; |
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450 | goto sendorfree; |
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451 | } |
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452 | m->m_flags |= (m0->m_flags & M_MCAST); |
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453 | m->m_data += max_linkhdr; |
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454 | mhip = mtod(m, struct ip *); |
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455 | *mhip = *ip; |
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456 | if (hlen > sizeof (struct ip)) { |
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457 | mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); |
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458 | #ifdef _IP_VHL |
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459 | mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2); |
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460 | #else |
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461 | mhip->ip_v = IPVERSION; |
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462 | mhip->ip_hl = mhlen >> 2; |
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463 | #endif |
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464 | } |
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465 | m->m_len = mhlen; |
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466 | mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF); |
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467 | if (ip->ip_off & IP_MF) |
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468 | mhip->ip_off |= IP_MF; |
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469 | if (off + len >= (u_short)ip->ip_len) |
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470 | len = (u_short)ip->ip_len - off; |
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471 | else |
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472 | mhip->ip_off |= IP_MF; |
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473 | mhip->ip_len = htons((u_short)(len + mhlen)); |
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474 | m->m_next = m_copy(m0, off, len); |
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475 | if (m->m_next == 0) { |
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476 | (void) m_free(m); |
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477 | error = ENOBUFS; /* ??? */ |
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478 | ipstat.ips_odropped++; |
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479 | goto sendorfree; |
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480 | } |
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481 | m->m_pkthdr.len = mhlen + len; |
---|
482 | m->m_pkthdr.rcvif = NULL; |
---|
483 | mhip->ip_off = htons(mhip->ip_off); |
---|
484 | mhip->ip_sum = 0; |
---|
485 | #ifdef _IP_VHL |
---|
486 | if (mhip->ip_vhl == IP_VHL_BORING) { |
---|
487 | #else |
---|
488 | if ((mhip->ip_hl == 5) && (mhip->ip_v == IPVERSION) ) { |
---|
489 | #endif |
---|
490 | mhip->ip_sum = in_cksum_hdr(mhip); |
---|
491 | } else { |
---|
492 | mhip->ip_sum = in_cksum(m, mhlen); |
---|
493 | } |
---|
494 | *mnext = m; |
---|
495 | mnext = &m->m_nextpkt; |
---|
496 | ipstat.ips_ofragments++; |
---|
497 | } |
---|
498 | /* |
---|
499 | * Update first fragment by trimming what's been copied out |
---|
500 | * and updating header, then send each fragment (in order). |
---|
501 | */ |
---|
502 | m = m0; |
---|
503 | m_adj(m, hlen + firstlen - (u_short)ip->ip_len); |
---|
504 | m->m_pkthdr.len = hlen + firstlen; |
---|
505 | ip->ip_len = htons((u_short)m->m_pkthdr.len); |
---|
506 | ip->ip_off |= IP_MF; |
---|
507 | ip->ip_off = htons(ip->ip_off); |
---|
508 | ip->ip_sum = 0; |
---|
509 | #ifdef _IP_VHL |
---|
510 | if (ip->ip_vhl == IP_VHL_BORING) { |
---|
511 | #else |
---|
512 | if ((ip->ip_hl == 5) && (ip->ip_v == IPVERSION) ) { |
---|
513 | #endif |
---|
514 | ip->ip_sum = in_cksum_hdr(ip); |
---|
515 | } else { |
---|
516 | ip->ip_sum = in_cksum(m, hlen); |
---|
517 | } |
---|
518 | sendorfree: |
---|
519 | for (m = m0; m; m = m0) { |
---|
520 | m0 = m->m_nextpkt; |
---|
521 | m->m_nextpkt = 0; |
---|
522 | if (error == 0) |
---|
523 | error = (*ifp->if_output)(ifp, m, |
---|
524 | (struct sockaddr *)dst, ro->ro_rt); |
---|
525 | else |
---|
526 | m_freem(m); |
---|
527 | } |
---|
528 | |
---|
529 | if (error == 0) |
---|
530 | ipstat.ips_fragmented++; |
---|
531 | } |
---|
532 | done: |
---|
533 | return (error); |
---|
534 | bad: |
---|
535 | m_freem(m0); |
---|
536 | goto done; |
---|
537 | } |
---|
538 | |
---|
539 | /* |
---|
540 | * Insert IP options into preformed packet. |
---|
541 | * Adjust IP destination as required for IP source routing, |
---|
542 | * as indicated by a non-zero in_addr at the start of the options. |
---|
543 | * |
---|
544 | * XXX This routine assumes that the packet has no options in place. |
---|
545 | */ |
---|
546 | static struct mbuf * |
---|
547 | ip_insertoptions(struct mbuf *m, struct mbuf *opt, int *phlen) |
---|
548 | { |
---|
549 | register struct ipoption *p = mtod(opt, struct ipoption *); |
---|
550 | struct mbuf *n; |
---|
551 | register struct ip *ip = mtod(m, struct ip *); |
---|
552 | uint32_t optlen; |
---|
553 | |
---|
554 | optlen = opt->m_len - sizeof(p->ipopt_dst); |
---|
555 | if (optlen + ip->ip_len > IP_MAXPACKET) |
---|
556 | return (m); /* XXX should fail */ |
---|
557 | if (p->ipopt_dst.s_addr) |
---|
558 | ip->ip_dst = p->ipopt_dst; |
---|
559 | if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { |
---|
560 | MGETHDR(n, M_DONTWAIT, MT_HEADER); |
---|
561 | if (n == 0) |
---|
562 | return (m); |
---|
563 | n->m_pkthdr.len = m->m_pkthdr.len + optlen; |
---|
564 | m->m_len -= sizeof(struct ip); |
---|
565 | m->m_data += sizeof(struct ip); |
---|
566 | n->m_next = m; |
---|
567 | m = n; |
---|
568 | m->m_len = optlen + sizeof(struct ip); |
---|
569 | m->m_data += max_linkhdr; |
---|
570 | (void)memcpy(mtod(m, void *), ip, sizeof(struct ip)); |
---|
571 | } else { |
---|
572 | m->m_data -= optlen; |
---|
573 | m->m_len += optlen; |
---|
574 | m->m_pkthdr.len += optlen; |
---|
575 | ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); |
---|
576 | } |
---|
577 | ip = mtod(m, struct ip *); |
---|
578 | bcopy(p->ipopt_list, ip + 1, optlen); |
---|
579 | *phlen = sizeof(struct ip) + optlen; |
---|
580 | #ifdef _IP_VHL |
---|
581 | ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2); |
---|
582 | #else |
---|
583 | ip->ip_v = IPVERSION; |
---|
584 | ip->ip_hl = *phlen >> 2; |
---|
585 | #endif |
---|
586 | ip->ip_len += optlen; |
---|
587 | return (m); |
---|
588 | } |
---|
589 | |
---|
590 | /* |
---|
591 | * Copy options from ip to jp, |
---|
592 | * omitting those not copied during fragmentation. |
---|
593 | */ |
---|
594 | static int |
---|
595 | ip_optcopy(struct ip *ip, struct ip *jp) |
---|
596 | { |
---|
597 | register u_char *cp, *dp; |
---|
598 | int opt, optlen, cnt; |
---|
599 | |
---|
600 | cp = (u_char *)(ip + 1); |
---|
601 | dp = (u_char *)(jp + 1); |
---|
602 | #ifdef _IP_VHL |
---|
603 | cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); |
---|
604 | #else |
---|
605 | cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
---|
606 | #endif |
---|
607 | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
---|
608 | opt = cp[0]; |
---|
609 | if (opt == IPOPT_EOL) |
---|
610 | break; |
---|
611 | if (opt == IPOPT_NOP) { |
---|
612 | /* Preserve for IP mcast tunnel's LSRR alignment. */ |
---|
613 | *dp++ = IPOPT_NOP; |
---|
614 | optlen = 1; |
---|
615 | continue; |
---|
616 | } else |
---|
617 | optlen = cp[IPOPT_OLEN]; |
---|
618 | /* bogus lengths should have been caught by ip_dooptions */ |
---|
619 | if (optlen > cnt) |
---|
620 | optlen = cnt; |
---|
621 | if (IPOPT_COPIED(opt)) { |
---|
622 | bcopy(cp, dp, optlen); |
---|
623 | dp += optlen; |
---|
624 | } |
---|
625 | } |
---|
626 | for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) |
---|
627 | *dp++ = IPOPT_EOL; |
---|
628 | return (optlen); |
---|
629 | } |
---|
630 | |
---|
631 | /* |
---|
632 | * IP socket option processing. |
---|
633 | */ |
---|
634 | int |
---|
635 | ip_ctloutput(int op, struct socket *so, int level, int optname, |
---|
636 | struct mbuf **mp) |
---|
637 | { |
---|
638 | struct inpcb *inp = sotoinpcb(so); |
---|
639 | register struct mbuf *m = *mp; |
---|
640 | register int optval = 0; |
---|
641 | int error = 0; |
---|
642 | |
---|
643 | if (level != IPPROTO_IP) { |
---|
644 | error = EINVAL; |
---|
645 | if (op == PRCO_SETOPT && *mp) |
---|
646 | (void) m_free(*mp); |
---|
647 | } else switch (op) { |
---|
648 | |
---|
649 | case PRCO_SETOPT: |
---|
650 | switch (optname) { |
---|
651 | case IP_OPTIONS: |
---|
652 | #ifdef notyet |
---|
653 | case IP_RETOPTS: |
---|
654 | return (ip_pcbopts(optname, &inp->inp_options, m)); |
---|
655 | #else |
---|
656 | return (ip_pcbopts(&inp->inp_options, m)); |
---|
657 | #endif |
---|
658 | |
---|
659 | case IP_TOS: |
---|
660 | case IP_TTL: |
---|
661 | case IP_RECVOPTS: |
---|
662 | case IP_RECVRETOPTS: |
---|
663 | case IP_RECVDSTADDR: |
---|
664 | case IP_RECVIF: |
---|
665 | if (m == 0 || m->m_len != sizeof(int)) |
---|
666 | error = EINVAL; |
---|
667 | else { |
---|
668 | optval = *mtod(m, int *); |
---|
669 | switch (optname) { |
---|
670 | |
---|
671 | case IP_TOS: |
---|
672 | inp->inp_ip_tos = optval; |
---|
673 | break; |
---|
674 | |
---|
675 | case IP_TTL: |
---|
676 | inp->inp_ip_ttl = optval; |
---|
677 | break; |
---|
678 | #define OPTSET(bit) \ |
---|
679 | if (optval) \ |
---|
680 | inp->inp_flags |= bit; \ |
---|
681 | else \ |
---|
682 | inp->inp_flags &= ~bit; |
---|
683 | |
---|
684 | case IP_RECVOPTS: |
---|
685 | OPTSET(INP_RECVOPTS); |
---|
686 | break; |
---|
687 | |
---|
688 | case IP_RECVRETOPTS: |
---|
689 | OPTSET(INP_RECVRETOPTS); |
---|
690 | break; |
---|
691 | |
---|
692 | case IP_RECVDSTADDR: |
---|
693 | OPTSET(INP_RECVDSTADDR); |
---|
694 | break; |
---|
695 | |
---|
696 | case IP_RECVIF: |
---|
697 | OPTSET(INP_RECVIF); |
---|
698 | break; |
---|
699 | } |
---|
700 | } |
---|
701 | break; |
---|
702 | #undef OPTSET |
---|
703 | |
---|
704 | case IP_MULTICAST_IF: |
---|
705 | case IP_MULTICAST_VIF: |
---|
706 | case IP_MULTICAST_TTL: |
---|
707 | case IP_MULTICAST_LOOP: |
---|
708 | case IP_ADD_MEMBERSHIP: |
---|
709 | case IP_DROP_MEMBERSHIP: |
---|
710 | error = ip_setmoptions(optname, &inp->inp_moptions, m); |
---|
711 | break; |
---|
712 | |
---|
713 | case IP_PORTRANGE: |
---|
714 | if (m == 0 || m->m_len != sizeof(int)) |
---|
715 | error = EINVAL; |
---|
716 | else { |
---|
717 | optval = *mtod(m, int *); |
---|
718 | |
---|
719 | switch (optval) { |
---|
720 | |
---|
721 | case IP_PORTRANGE_DEFAULT: |
---|
722 | inp->inp_flags &= ~(INP_LOWPORT); |
---|
723 | inp->inp_flags &= ~(INP_HIGHPORT); |
---|
724 | break; |
---|
725 | |
---|
726 | case IP_PORTRANGE_HIGH: |
---|
727 | inp->inp_flags &= ~(INP_LOWPORT); |
---|
728 | inp->inp_flags |= INP_HIGHPORT; |
---|
729 | break; |
---|
730 | |
---|
731 | case IP_PORTRANGE_LOW: |
---|
732 | inp->inp_flags &= ~(INP_HIGHPORT); |
---|
733 | inp->inp_flags |= INP_LOWPORT; |
---|
734 | break; |
---|
735 | |
---|
736 | default: |
---|
737 | error = EINVAL; |
---|
738 | break; |
---|
739 | } |
---|
740 | } |
---|
741 | break; |
---|
742 | |
---|
743 | default: |
---|
744 | error = ENOPROTOOPT; |
---|
745 | break; |
---|
746 | } |
---|
747 | if (m) |
---|
748 | (void)m_free(m); |
---|
749 | break; |
---|
750 | |
---|
751 | case PRCO_GETOPT: |
---|
752 | switch (optname) { |
---|
753 | case IP_OPTIONS: |
---|
754 | case IP_RETOPTS: |
---|
755 | *mp = m = m_get(M_WAIT, MT_SOOPTS); |
---|
756 | if (inp->inp_options) { |
---|
757 | m->m_len = inp->inp_options->m_len; |
---|
758 | bcopy(mtod(inp->inp_options, void *), |
---|
759 | mtod(m, void *), m->m_len); |
---|
760 | } else |
---|
761 | m->m_len = 0; |
---|
762 | break; |
---|
763 | |
---|
764 | case IP_TOS: |
---|
765 | case IP_TTL: |
---|
766 | case IP_RECVOPTS: |
---|
767 | case IP_RECVRETOPTS: |
---|
768 | case IP_RECVDSTADDR: |
---|
769 | case IP_RECVIF: |
---|
770 | *mp = m = m_get(M_WAIT, MT_SOOPTS); |
---|
771 | m->m_len = sizeof(int); |
---|
772 | switch (optname) { |
---|
773 | |
---|
774 | case IP_TOS: |
---|
775 | optval = inp->inp_ip_tos; |
---|
776 | break; |
---|
777 | |
---|
778 | case IP_TTL: |
---|
779 | optval = inp->inp_ip_ttl; |
---|
780 | break; |
---|
781 | |
---|
782 | #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) |
---|
783 | |
---|
784 | case IP_RECVOPTS: |
---|
785 | optval = OPTBIT(INP_RECVOPTS); |
---|
786 | break; |
---|
787 | |
---|
788 | case IP_RECVRETOPTS: |
---|
789 | optval = OPTBIT(INP_RECVRETOPTS); |
---|
790 | break; |
---|
791 | |
---|
792 | case IP_RECVDSTADDR: |
---|
793 | optval = OPTBIT(INP_RECVDSTADDR); |
---|
794 | break; |
---|
795 | |
---|
796 | case IP_RECVIF: |
---|
797 | optval = OPTBIT(INP_RECVIF); |
---|
798 | break; |
---|
799 | } |
---|
800 | *mtod(m, int *) = optval; |
---|
801 | break; |
---|
802 | |
---|
803 | case IP_MULTICAST_IF: |
---|
804 | case IP_MULTICAST_VIF: |
---|
805 | case IP_MULTICAST_TTL: |
---|
806 | case IP_MULTICAST_LOOP: |
---|
807 | case IP_ADD_MEMBERSHIP: |
---|
808 | case IP_DROP_MEMBERSHIP: |
---|
809 | error = ip_getmoptions(optname, inp->inp_moptions, mp); |
---|
810 | break; |
---|
811 | |
---|
812 | case IP_PORTRANGE: |
---|
813 | *mp = m = m_get(M_WAIT, MT_SOOPTS); |
---|
814 | m->m_len = sizeof(int); |
---|
815 | |
---|
816 | if (inp->inp_flags & INP_HIGHPORT) |
---|
817 | optval = IP_PORTRANGE_HIGH; |
---|
818 | else if (inp->inp_flags & INP_LOWPORT) |
---|
819 | optval = IP_PORTRANGE_LOW; |
---|
820 | else |
---|
821 | optval = 0; |
---|
822 | |
---|
823 | *mtod(m, int *) = optval; |
---|
824 | break; |
---|
825 | |
---|
826 | default: |
---|
827 | error = ENOPROTOOPT; |
---|
828 | break; |
---|
829 | } |
---|
830 | break; |
---|
831 | } |
---|
832 | return (error); |
---|
833 | } |
---|
834 | |
---|
835 | /* |
---|
836 | * Set up IP options in pcb for insertion in output packets. |
---|
837 | * Store in mbuf with pointer in pcbopt, adding pseudo-option |
---|
838 | * with destination address if source routed. |
---|
839 | */ |
---|
840 | static int |
---|
841 | #ifdef notyet |
---|
842 | ip_pcbopts(int optname, struct mbuf **pcbopt, struct mbuf *m) |
---|
843 | #else |
---|
844 | ip_pcbopts(struct mbuf **pcbopt, struct mbuf *m) |
---|
845 | #endif |
---|
846 | { |
---|
847 | register int cnt, optlen; |
---|
848 | register u_char *cp; |
---|
849 | u_char opt; |
---|
850 | |
---|
851 | /* turn off any old options */ |
---|
852 | if (*pcbopt) |
---|
853 | (void)m_free(*pcbopt); |
---|
854 | *pcbopt = 0; |
---|
855 | if (m == (struct mbuf *)0 || m->m_len == 0) { |
---|
856 | /* |
---|
857 | * Only turning off any previous options. |
---|
858 | */ |
---|
859 | if (m) |
---|
860 | (void)m_free(m); |
---|
861 | return (0); |
---|
862 | } |
---|
863 | |
---|
864 | #ifndef vax |
---|
865 | if (m->m_len % sizeof(long)) |
---|
866 | goto bad; |
---|
867 | #endif |
---|
868 | /* |
---|
869 | * IP first-hop destination address will be stored before |
---|
870 | * actual options; move other options back |
---|
871 | * and clear it when none present. |
---|
872 | */ |
---|
873 | if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) |
---|
874 | goto bad; |
---|
875 | cnt = m->m_len; |
---|
876 | m->m_len += sizeof(struct in_addr); |
---|
877 | cp = mtod(m, u_char *) + sizeof(struct in_addr); |
---|
878 | ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt); |
---|
879 | bzero(mtod(m, caddr_t), sizeof(struct in_addr)); |
---|
880 | |
---|
881 | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
---|
882 | opt = cp[IPOPT_OPTVAL]; |
---|
883 | if (opt == IPOPT_EOL) |
---|
884 | break; |
---|
885 | if (opt == IPOPT_NOP) |
---|
886 | optlen = 1; |
---|
887 | else { |
---|
888 | optlen = cp[IPOPT_OLEN]; |
---|
889 | if (optlen <= IPOPT_OLEN || optlen > cnt) |
---|
890 | goto bad; |
---|
891 | } |
---|
892 | switch (opt) { |
---|
893 | |
---|
894 | default: |
---|
895 | break; |
---|
896 | |
---|
897 | case IPOPT_LSRR: |
---|
898 | case IPOPT_SSRR: |
---|
899 | /* |
---|
900 | * user process specifies route as: |
---|
901 | * ->A->B->C->D |
---|
902 | * D must be our final destination (but we can't |
---|
903 | * check that since we may not have connected yet). |
---|
904 | * A is first hop destination, which doesn't appear in |
---|
905 | * actual IP option, but is stored before the options. |
---|
906 | */ |
---|
907 | if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) |
---|
908 | goto bad; |
---|
909 | m->m_len -= sizeof(struct in_addr); |
---|
910 | cnt -= sizeof(struct in_addr); |
---|
911 | optlen -= sizeof(struct in_addr); |
---|
912 | cp[IPOPT_OLEN] = optlen; |
---|
913 | /* |
---|
914 | * Move first hop before start of options. |
---|
915 | */ |
---|
916 | bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), |
---|
917 | sizeof(struct in_addr)); |
---|
918 | /* |
---|
919 | * Then copy rest of options back |
---|
920 | * to close up the deleted entry. |
---|
921 | */ |
---|
922 | ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] + |
---|
923 | sizeof(struct in_addr)), |
---|
924 | (caddr_t)&cp[IPOPT_OFFSET+1], |
---|
925 | (unsigned)cnt + sizeof(struct in_addr)); |
---|
926 | break; |
---|
927 | } |
---|
928 | } |
---|
929 | if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) |
---|
930 | goto bad; |
---|
931 | *pcbopt = m; |
---|
932 | return (0); |
---|
933 | |
---|
934 | bad: |
---|
935 | (void)m_free(m); |
---|
936 | return (EINVAL); |
---|
937 | } |
---|
938 | |
---|
939 | /* |
---|
940 | * Set the IP multicast options in response to user setsockopt(). |
---|
941 | */ |
---|
942 | static int |
---|
943 | ip_setmoptions(int optname, struct ip_moptions **imop, struct mbuf *m) |
---|
944 | { |
---|
945 | int error = 0; |
---|
946 | u_char loop; |
---|
947 | int i; |
---|
948 | struct in_addr addr; |
---|
949 | struct ip_mreq *mreq; |
---|
950 | struct ifnet *ifp; |
---|
951 | struct ip_moptions *imo = *imop; |
---|
952 | struct route ro; |
---|
953 | register struct sockaddr_in *dst; |
---|
954 | int s; |
---|
955 | |
---|
956 | if (imo == NULL) { |
---|
957 | /* |
---|
958 | * No multicast option buffer attached to the pcb; |
---|
959 | * allocate one and initialize to default values. |
---|
960 | */ |
---|
961 | imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, |
---|
962 | M_WAITOK); |
---|
963 | |
---|
964 | if (imo == NULL) |
---|
965 | return (ENOBUFS); |
---|
966 | *imop = imo; |
---|
967 | imo->imo_multicast_ifp = NULL; |
---|
968 | imo->imo_multicast_vif = -1; |
---|
969 | imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; |
---|
970 | imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; |
---|
971 | imo->imo_num_memberships = 0; |
---|
972 | } |
---|
973 | |
---|
974 | switch (optname) { |
---|
975 | /* store an index number for the vif you wanna use in the send */ |
---|
976 | case IP_MULTICAST_VIF: |
---|
977 | if (!legal_vif_num) { |
---|
978 | error = EOPNOTSUPP; |
---|
979 | break; |
---|
980 | } |
---|
981 | if (m == NULL || m->m_len != sizeof(int)) { |
---|
982 | error = EINVAL; |
---|
983 | break; |
---|
984 | } |
---|
985 | i = *(mtod(m, int *)); |
---|
986 | if (!legal_vif_num(i) && (i != -1)) { |
---|
987 | error = EINVAL; |
---|
988 | break; |
---|
989 | } |
---|
990 | imo->imo_multicast_vif = i; |
---|
991 | break; |
---|
992 | |
---|
993 | case IP_MULTICAST_IF: |
---|
994 | /* |
---|
995 | * Select the interface for outgoing multicast packets. |
---|
996 | */ |
---|
997 | if (m == NULL || m->m_len != sizeof(struct in_addr)) { |
---|
998 | error = EINVAL; |
---|
999 | break; |
---|
1000 | } |
---|
1001 | addr = *(mtod(m, struct in_addr *)); |
---|
1002 | /* |
---|
1003 | * INADDR_ANY is used to remove a previous selection. |
---|
1004 | * When no interface is selected, a default one is |
---|
1005 | * chosen every time a multicast packet is sent. |
---|
1006 | */ |
---|
1007 | if (addr.s_addr == INADDR_ANY) { |
---|
1008 | imo->imo_multicast_ifp = NULL; |
---|
1009 | break; |
---|
1010 | } |
---|
1011 | /* |
---|
1012 | * The selected interface is identified by its local |
---|
1013 | * IP address. Find the interface and confirm that |
---|
1014 | * it supports multicasting. |
---|
1015 | */ |
---|
1016 | s = splimp(); |
---|
1017 | INADDR_TO_IFP(addr, ifp); |
---|
1018 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { |
---|
1019 | splx(s); |
---|
1020 | error = EADDRNOTAVAIL; |
---|
1021 | break; |
---|
1022 | } |
---|
1023 | imo->imo_multicast_ifp = ifp; |
---|
1024 | splx(s); |
---|
1025 | break; |
---|
1026 | |
---|
1027 | case IP_MULTICAST_TTL: |
---|
1028 | /* |
---|
1029 | * Set the IP time-to-live for outgoing multicast packets. |
---|
1030 | */ |
---|
1031 | if (m == NULL || m->m_len != 1) { |
---|
1032 | error = EINVAL; |
---|
1033 | break; |
---|
1034 | } |
---|
1035 | imo->imo_multicast_ttl = *(mtod(m, u_char *)); |
---|
1036 | break; |
---|
1037 | |
---|
1038 | case IP_MULTICAST_LOOP: |
---|
1039 | /* |
---|
1040 | * Set the loopback flag for outgoing multicast packets. |
---|
1041 | * Must be zero or one. |
---|
1042 | */ |
---|
1043 | if (m == NULL || m->m_len != 1 || |
---|
1044 | (loop = *(mtod(m, u_char *))) > 1) { |
---|
1045 | error = EINVAL; |
---|
1046 | break; |
---|
1047 | } |
---|
1048 | imo->imo_multicast_loop = loop; |
---|
1049 | break; |
---|
1050 | |
---|
1051 | case IP_ADD_MEMBERSHIP: |
---|
1052 | /* |
---|
1053 | * Add a multicast group membership. |
---|
1054 | * Group must be a valid IP multicast address. |
---|
1055 | */ |
---|
1056 | if (m == NULL || m->m_len != sizeof(struct ip_mreq)) { |
---|
1057 | error = EINVAL; |
---|
1058 | break; |
---|
1059 | } |
---|
1060 | mreq = mtod(m, struct ip_mreq *); |
---|
1061 | if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { |
---|
1062 | error = EINVAL; |
---|
1063 | break; |
---|
1064 | } |
---|
1065 | s = splimp(); |
---|
1066 | /* |
---|
1067 | * If no interface address was provided, use the interface of |
---|
1068 | * the route to the given multicast address. |
---|
1069 | */ |
---|
1070 | if (mreq->imr_interface.s_addr == INADDR_ANY) { |
---|
1071 | bzero((caddr_t)&ro, sizeof(ro)); |
---|
1072 | dst = (struct sockaddr_in *)&ro.ro_dst; |
---|
1073 | dst->sin_len = sizeof(*dst); |
---|
1074 | dst->sin_family = AF_INET; |
---|
1075 | dst->sin_addr = mreq->imr_multiaddr; |
---|
1076 | rtalloc(&ro); |
---|
1077 | if (ro.ro_rt == NULL) { |
---|
1078 | error = EADDRNOTAVAIL; |
---|
1079 | splx(s); |
---|
1080 | break; |
---|
1081 | } |
---|
1082 | ifp = ro.ro_rt->rt_ifp; |
---|
1083 | rtfree(ro.ro_rt); |
---|
1084 | } |
---|
1085 | else { |
---|
1086 | INADDR_TO_IFP(mreq->imr_interface, ifp); |
---|
1087 | } |
---|
1088 | |
---|
1089 | /* |
---|
1090 | * See if we found an interface, and confirm that it |
---|
1091 | * supports multicast. |
---|
1092 | */ |
---|
1093 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { |
---|
1094 | error = EADDRNOTAVAIL; |
---|
1095 | splx(s); |
---|
1096 | break; |
---|
1097 | } |
---|
1098 | /* |
---|
1099 | * See if the membership already exists or if all the |
---|
1100 | * membership slots are full. |
---|
1101 | */ |
---|
1102 | for (i = 0; i < imo->imo_num_memberships; ++i) { |
---|
1103 | if (imo->imo_membership[i]->inm_ifp == ifp && |
---|
1104 | imo->imo_membership[i]->inm_addr.s_addr |
---|
1105 | == mreq->imr_multiaddr.s_addr) |
---|
1106 | break; |
---|
1107 | } |
---|
1108 | if (i < imo->imo_num_memberships) { |
---|
1109 | error = EADDRINUSE; |
---|
1110 | splx(s); |
---|
1111 | break; |
---|
1112 | } |
---|
1113 | if (i == IP_MAX_MEMBERSHIPS) { |
---|
1114 | error = ETOOMANYREFS; |
---|
1115 | splx(s); |
---|
1116 | break; |
---|
1117 | } |
---|
1118 | /* |
---|
1119 | * Everything looks good; add a new record to the multicast |
---|
1120 | * address list for the given interface. |
---|
1121 | */ |
---|
1122 | if ((imo->imo_membership[i] = |
---|
1123 | in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) { |
---|
1124 | error = ENOBUFS; |
---|
1125 | splx(s); |
---|
1126 | break; |
---|
1127 | } |
---|
1128 | ++imo->imo_num_memberships; |
---|
1129 | splx(s); |
---|
1130 | break; |
---|
1131 | |
---|
1132 | case IP_DROP_MEMBERSHIP: |
---|
1133 | /* |
---|
1134 | * Drop a multicast group membership. |
---|
1135 | * Group must be a valid IP multicast address. |
---|
1136 | */ |
---|
1137 | if (m == NULL || m->m_len != sizeof(struct ip_mreq)) { |
---|
1138 | error = EINVAL; |
---|
1139 | break; |
---|
1140 | } |
---|
1141 | mreq = mtod(m, struct ip_mreq *); |
---|
1142 | if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { |
---|
1143 | error = EINVAL; |
---|
1144 | break; |
---|
1145 | } |
---|
1146 | |
---|
1147 | s = splimp(); |
---|
1148 | /* |
---|
1149 | * If an interface address was specified, get a pointer |
---|
1150 | * to its ifnet structure. |
---|
1151 | */ |
---|
1152 | if (mreq->imr_interface.s_addr == INADDR_ANY) |
---|
1153 | ifp = NULL; |
---|
1154 | else { |
---|
1155 | INADDR_TO_IFP(mreq->imr_interface, ifp); |
---|
1156 | if (ifp == NULL) { |
---|
1157 | error = EADDRNOTAVAIL; |
---|
1158 | splx(s); |
---|
1159 | break; |
---|
1160 | } |
---|
1161 | } |
---|
1162 | /* |
---|
1163 | * Find the membership in the membership array. |
---|
1164 | */ |
---|
1165 | for (i = 0; i < imo->imo_num_memberships; ++i) { |
---|
1166 | if ((ifp == NULL || |
---|
1167 | imo->imo_membership[i]->inm_ifp == ifp) && |
---|
1168 | imo->imo_membership[i]->inm_addr.s_addr == |
---|
1169 | mreq->imr_multiaddr.s_addr) |
---|
1170 | break; |
---|
1171 | } |
---|
1172 | if (i == imo->imo_num_memberships) { |
---|
1173 | error = EADDRNOTAVAIL; |
---|
1174 | splx(s); |
---|
1175 | break; |
---|
1176 | } |
---|
1177 | /* |
---|
1178 | * Give up the multicast address record to which the |
---|
1179 | * membership points. |
---|
1180 | */ |
---|
1181 | in_delmulti(imo->imo_membership[i]); |
---|
1182 | /* |
---|
1183 | * Remove the gap in the membership array. |
---|
1184 | */ |
---|
1185 | for (++i; i < imo->imo_num_memberships; ++i) |
---|
1186 | imo->imo_membership[i-1] = imo->imo_membership[i]; |
---|
1187 | --imo->imo_num_memberships; |
---|
1188 | splx(s); |
---|
1189 | break; |
---|
1190 | |
---|
1191 | default: |
---|
1192 | error = EOPNOTSUPP; |
---|
1193 | break; |
---|
1194 | } |
---|
1195 | |
---|
1196 | /* |
---|
1197 | * If all options have default values, no need to keep the mbuf. |
---|
1198 | */ |
---|
1199 | if (imo->imo_multicast_ifp == NULL && |
---|
1200 | imo->imo_multicast_vif == -1 && |
---|
1201 | imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && |
---|
1202 | imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && |
---|
1203 | imo->imo_num_memberships == 0) { |
---|
1204 | free(*imop, M_IPMOPTS); |
---|
1205 | *imop = NULL; |
---|
1206 | } |
---|
1207 | |
---|
1208 | return (error); |
---|
1209 | } |
---|
1210 | |
---|
1211 | /* |
---|
1212 | * Return the IP multicast options in response to user getsockopt(). |
---|
1213 | */ |
---|
1214 | static int |
---|
1215 | ip_getmoptions(int optname, struct ip_moptions *imo, |
---|
1216 | struct mbuf **mp) |
---|
1217 | { |
---|
1218 | u_char *ttl; |
---|
1219 | u_char *loop; |
---|
1220 | struct in_addr *addr; |
---|
1221 | struct in_ifaddr *ia; |
---|
1222 | |
---|
1223 | *mp = m_get(M_WAIT, MT_SOOPTS); |
---|
1224 | |
---|
1225 | switch (optname) { |
---|
1226 | |
---|
1227 | case IP_MULTICAST_VIF: |
---|
1228 | if (imo != NULL) |
---|
1229 | *(mtod(*mp, int *)) = imo->imo_multicast_vif; |
---|
1230 | else |
---|
1231 | *(mtod(*mp, int *)) = -1; |
---|
1232 | (*mp)->m_len = sizeof(int); |
---|
1233 | return(0); |
---|
1234 | |
---|
1235 | case IP_MULTICAST_IF: |
---|
1236 | addr = mtod(*mp, struct in_addr *); |
---|
1237 | (*mp)->m_len = sizeof(struct in_addr); |
---|
1238 | if (imo == NULL || imo->imo_multicast_ifp == NULL) |
---|
1239 | addr->s_addr = INADDR_ANY; |
---|
1240 | else { |
---|
1241 | IFP_TO_IA(imo->imo_multicast_ifp, ia); |
---|
1242 | addr->s_addr = (ia == NULL) ? INADDR_ANY |
---|
1243 | : IA_SIN(ia)->sin_addr.s_addr; |
---|
1244 | } |
---|
1245 | return (0); |
---|
1246 | |
---|
1247 | case IP_MULTICAST_TTL: |
---|
1248 | ttl = mtod(*mp, u_char *); |
---|
1249 | (*mp)->m_len = 1; |
---|
1250 | *ttl = (imo == NULL) ? IP_DEFAULT_MULTICAST_TTL |
---|
1251 | : imo->imo_multicast_ttl; |
---|
1252 | return (0); |
---|
1253 | |
---|
1254 | case IP_MULTICAST_LOOP: |
---|
1255 | loop = mtod(*mp, u_char *); |
---|
1256 | (*mp)->m_len = 1; |
---|
1257 | *loop = (imo == NULL) ? IP_DEFAULT_MULTICAST_LOOP |
---|
1258 | : imo->imo_multicast_loop; |
---|
1259 | return (0); |
---|
1260 | |
---|
1261 | default: |
---|
1262 | return (EOPNOTSUPP); |
---|
1263 | } |
---|
1264 | } |
---|
1265 | |
---|
1266 | /* |
---|
1267 | * Discard the IP multicast options. |
---|
1268 | */ |
---|
1269 | void |
---|
1270 | ip_freemoptions(struct ip_moptions *imo) |
---|
1271 | { |
---|
1272 | register int i; |
---|
1273 | |
---|
1274 | if (imo != NULL) { |
---|
1275 | for (i = 0; i < imo->imo_num_memberships; ++i) |
---|
1276 | in_delmulti(imo->imo_membership[i]); |
---|
1277 | free(imo, M_IPMOPTS); |
---|
1278 | } |
---|
1279 | } |
---|
1280 | |
---|
1281 | /* |
---|
1282 | * Routine called from ip_output() to loop back a copy of an IP multicast |
---|
1283 | * packet to the input queue of a specified interface. Note that this |
---|
1284 | * calls the output routine of the loopback "driver", but with an interface |
---|
1285 | * pointer that might NOT be a loopback interface -- evil, but easier than |
---|
1286 | * replicating that code here. |
---|
1287 | */ |
---|
1288 | static void |
---|
1289 | ip_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in *dst, |
---|
1290 | int hlen) |
---|
1291 | { |
---|
1292 | register struct ip *ip; |
---|
1293 | struct mbuf *copym; |
---|
1294 | |
---|
1295 | copym = m_copy(m, 0, M_COPYALL); |
---|
1296 | if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) |
---|
1297 | copym = m_pullup(copym, hlen); |
---|
1298 | if (copym != NULL) { |
---|
1299 | /* |
---|
1300 | * We don't bother to fragment if the IP length is greater |
---|
1301 | * than the interface's MTU. Can this possibly matter? |
---|
1302 | */ |
---|
1303 | ip = mtod(copym, struct ip *); |
---|
1304 | ip->ip_len = htons(ip->ip_len); |
---|
1305 | ip->ip_off = htons(ip->ip_off); |
---|
1306 | ip->ip_sum = 0; |
---|
1307 | #ifdef _IP_VHL |
---|
1308 | if (ip->ip_vhl == IP_VHL_BORING) { |
---|
1309 | ip->ip_sum = in_cksum_hdr(ip); |
---|
1310 | } else { |
---|
1311 | ip->ip_sum = in_cksum(copym, hlen); |
---|
1312 | } |
---|
1313 | #else |
---|
1314 | ip->ip_sum = in_cksum(copym, hlen); |
---|
1315 | #endif |
---|
1316 | /* |
---|
1317 | * NB: |
---|
1318 | * It's not clear whether there are any lingering |
---|
1319 | * reentrancy problems in other areas which might |
---|
1320 | * be exposed by using ip_input directly (in |
---|
1321 | * particular, everything which modifies the packet |
---|
1322 | * in-place). Yet another option is using the |
---|
1323 | * protosw directly to deliver the looped back |
---|
1324 | * packet. For the moment, we'll err on the side |
---|
1325 | * of safety by continuing to abuse looutput(). |
---|
1326 | */ |
---|
1327 | #ifdef notdef |
---|
1328 | copym->m_pkthdr.rcvif = ifp; |
---|
1329 | ip_input(copym); |
---|
1330 | #else |
---|
1331 | (void) looutput(ifp, copym, (struct sockaddr *)dst, NULL); |
---|
1332 | #endif |
---|
1333 | } |
---|
1334 | } |
---|