root / slirp / ip_input.c @ 7878ff6b
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1 | f0cbd3ec | bellard | /*
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2 | f0cbd3ec | bellard | * Copyright (c) 1982, 1986, 1988, 1993
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3 | f0cbd3ec | bellard | * The Regents of the University of California. All rights reserved.
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4 | f0cbd3ec | bellard | *
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5 | f0cbd3ec | bellard | * Redistribution and use in source and binary forms, with or without
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6 | f0cbd3ec | bellard | * modification, are permitted provided that the following conditions
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7 | f0cbd3ec | bellard | * are met:
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8 | f0cbd3ec | bellard | * 1. Redistributions of source code must retain the above copyright
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9 | f0cbd3ec | bellard | * notice, this list of conditions and the following disclaimer.
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10 | f0cbd3ec | bellard | * 2. Redistributions in binary form must reproduce the above copyright
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11 | f0cbd3ec | bellard | * notice, this list of conditions and the following disclaimer in the
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12 | f0cbd3ec | bellard | * documentation and/or other materials provided with the distribution.
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13 | f0cbd3ec | bellard | * 3. All advertising materials mentioning features or use of this software
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14 | f0cbd3ec | bellard | * must display the following acknowledgement:
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15 | f0cbd3ec | bellard | * This product includes software developed by the University of
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16 | f0cbd3ec | bellard | * California, Berkeley and its contributors.
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17 | f0cbd3ec | bellard | * 4. Neither the name of the University nor the names of its contributors
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18 | f0cbd3ec | bellard | * may be used to endorse or promote products derived from this software
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19 | f0cbd3ec | bellard | * without specific prior written permission.
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20 | f0cbd3ec | bellard | *
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21 | f0cbd3ec | bellard | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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22 | f0cbd3ec | bellard | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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23 | f0cbd3ec | bellard | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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24 | f0cbd3ec | bellard | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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25 | f0cbd3ec | bellard | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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26 | f0cbd3ec | bellard | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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27 | f0cbd3ec | bellard | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 | f0cbd3ec | bellard | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 | f0cbd3ec | bellard | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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30 | f0cbd3ec | bellard | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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31 | f0cbd3ec | bellard | * SUCH DAMAGE.
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32 | f0cbd3ec | bellard | *
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33 | f0cbd3ec | bellard | * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
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34 | f0cbd3ec | bellard | * ip_input.c,v 1.11 1994/11/16 10:17:08 jkh Exp
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35 | f0cbd3ec | bellard | */
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36 | f0cbd3ec | bellard | |
37 | f0cbd3ec | bellard | /*
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38 | f0cbd3ec | bellard | * Changes and additions relating to SLiRP are
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39 | f0cbd3ec | bellard | * Copyright (c) 1995 Danny Gasparovski.
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40 | 5fafdf24 | ths | *
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41 | f0cbd3ec | bellard | * Please read the file COPYRIGHT for the
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42 | f0cbd3ec | bellard | * terms and conditions of the copyright.
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43 | f0cbd3ec | bellard | */
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44 | f0cbd3ec | bellard | |
45 | f0cbd3ec | bellard | #include <slirp.h> |
46 | f0cbd3ec | bellard | #include "ip_icmp.h" |
47 | f0cbd3ec | bellard | |
48 | 31a60e22 | blueswir1 | #ifdef LOG_ENABLED
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49 | f0cbd3ec | bellard | struct ipstat ipstat;
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50 | 31a60e22 | blueswir1 | #endif
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51 | 31a60e22 | blueswir1 | |
52 | f0cbd3ec | bellard | struct ipq ipq;
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53 | f0cbd3ec | bellard | |
54 | 9634d903 | blueswir1 | static struct ip *ip_reass(register struct ipasfrag *ip, |
55 | 9634d903 | blueswir1 | register struct ipq *fp); |
56 | 9634d903 | blueswir1 | static void ip_freef(struct ipq *fp); |
57 | 9634d903 | blueswir1 | static void ip_enq(register struct ipasfrag *p, |
58 | 9634d903 | blueswir1 | register struct ipasfrag *prev); |
59 | 9634d903 | blueswir1 | static void ip_deq(register struct ipasfrag *p); |
60 | 9634d903 | blueswir1 | |
61 | f0cbd3ec | bellard | /*
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62 | f0cbd3ec | bellard | * IP initialization: fill in IP protocol switch table.
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63 | f0cbd3ec | bellard | * All protocols not implemented in kernel go to raw IP protocol handler.
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64 | f0cbd3ec | bellard | */
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65 | f0cbd3ec | bellard | void
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66 | f0cbd3ec | bellard | ip_init() |
67 | f0cbd3ec | bellard | { |
68 | f0cbd3ec | bellard | ipq.next = ipq.prev = (ipqp_32)&ipq; |
69 | f0cbd3ec | bellard | ip_id = tt.tv_sec & 0xffff;
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70 | f0cbd3ec | bellard | udp_init(); |
71 | f0cbd3ec | bellard | tcp_init(); |
72 | f0cbd3ec | bellard | } |
73 | f0cbd3ec | bellard | |
74 | f0cbd3ec | bellard | /*
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75 | f0cbd3ec | bellard | * Ip input routine. Checksum and byte swap header. If fragmented
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76 | f0cbd3ec | bellard | * try to reassemble. Process options. Pass to next level.
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77 | f0cbd3ec | bellard | */
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78 | f0cbd3ec | bellard | void
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79 | f0cbd3ec | bellard | ip_input(m) |
80 | f0cbd3ec | bellard | struct mbuf *m;
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81 | f0cbd3ec | bellard | { |
82 | f0cbd3ec | bellard | register struct ip *ip; |
83 | f0cbd3ec | bellard | int hlen;
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84 | 5fafdf24 | ths | |
85 | f0cbd3ec | bellard | DEBUG_CALL("ip_input");
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86 | f0cbd3ec | bellard | DEBUG_ARG("m = %lx", (long)m); |
87 | f0cbd3ec | bellard | DEBUG_ARG("m_len = %d", m->m_len);
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88 | f0cbd3ec | bellard | |
89 | 31a60e22 | blueswir1 | STAT(ipstat.ips_total++); |
90 | 5fafdf24 | ths | |
91 | f0cbd3ec | bellard | if (m->m_len < sizeof (struct ip)) { |
92 | 31a60e22 | blueswir1 | STAT(ipstat.ips_toosmall++); |
93 | f0cbd3ec | bellard | return;
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94 | f0cbd3ec | bellard | } |
95 | 5fafdf24 | ths | |
96 | f0cbd3ec | bellard | ip = mtod(m, struct ip *);
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97 | 5fafdf24 | ths | |
98 | f0cbd3ec | bellard | if (ip->ip_v != IPVERSION) {
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99 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badvers++); |
100 | f0cbd3ec | bellard | goto bad;
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101 | f0cbd3ec | bellard | } |
102 | f0cbd3ec | bellard | |
103 | f0cbd3ec | bellard | hlen = ip->ip_hl << 2;
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104 | f0cbd3ec | bellard | if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */ |
105 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badhlen++); /* or packet too short */
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106 | f0cbd3ec | bellard | goto bad;
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107 | f0cbd3ec | bellard | } |
108 | f0cbd3ec | bellard | |
109 | f0cbd3ec | bellard | /* keep ip header intact for ICMP reply
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110 | 5fafdf24 | ths | * ip->ip_sum = cksum(m, hlen);
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111 | 5fafdf24 | ths | * if (ip->ip_sum) {
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112 | f0cbd3ec | bellard | */
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113 | f0cbd3ec | bellard | if(cksum(m,hlen)) {
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114 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badsum++); |
115 | f0cbd3ec | bellard | goto bad;
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116 | f0cbd3ec | bellard | } |
117 | f0cbd3ec | bellard | |
118 | f0cbd3ec | bellard | /*
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119 | f0cbd3ec | bellard | * Convert fields to host representation.
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120 | f0cbd3ec | bellard | */
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121 | f0cbd3ec | bellard | NTOHS(ip->ip_len); |
122 | f0cbd3ec | bellard | if (ip->ip_len < hlen) {
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123 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badlen++); |
124 | f0cbd3ec | bellard | goto bad;
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125 | f0cbd3ec | bellard | } |
126 | f0cbd3ec | bellard | NTOHS(ip->ip_id); |
127 | f0cbd3ec | bellard | NTOHS(ip->ip_off); |
128 | f0cbd3ec | bellard | |
129 | f0cbd3ec | bellard | /*
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130 | f0cbd3ec | bellard | * Check that the amount of data in the buffers
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131 | f0cbd3ec | bellard | * is as at least much as the IP header would have us expect.
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132 | f0cbd3ec | bellard | * Trim mbufs if longer than we expect.
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133 | f0cbd3ec | bellard | * Drop packet if shorter than we expect.
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134 | f0cbd3ec | bellard | */
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135 | f0cbd3ec | bellard | if (m->m_len < ip->ip_len) {
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136 | 31a60e22 | blueswir1 | STAT(ipstat.ips_tooshort++); |
137 | f0cbd3ec | bellard | goto bad;
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138 | f0cbd3ec | bellard | } |
139 | f0cbd3ec | bellard | /* Should drop packet if mbuf too long? hmmm... */
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140 | f0cbd3ec | bellard | if (m->m_len > ip->ip_len)
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141 | f0cbd3ec | bellard | m_adj(m, ip->ip_len - m->m_len); |
142 | f0cbd3ec | bellard | |
143 | f0cbd3ec | bellard | /* check ip_ttl for a correct ICMP reply */
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144 | f0cbd3ec | bellard | if(ip->ip_ttl==0 || ip->ip_ttl==1) { |
145 | f0cbd3ec | bellard | icmp_error(m, ICMP_TIMXCEED,ICMP_TIMXCEED_INTRANS, 0,"ttl"); |
146 | f0cbd3ec | bellard | goto bad;
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147 | f0cbd3ec | bellard | } |
148 | f0cbd3ec | bellard | |
149 | f0cbd3ec | bellard | /*
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150 | f0cbd3ec | bellard | * Process options and, if not destined for us,
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151 | f0cbd3ec | bellard | * ship it on. ip_dooptions returns 1 when an
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152 | f0cbd3ec | bellard | * error was detected (causing an icmp message
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153 | f0cbd3ec | bellard | * to be sent and the original packet to be freed).
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154 | f0cbd3ec | bellard | */
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155 | f0cbd3ec | bellard | /* We do no IP options */
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156 | f0cbd3ec | bellard | /* if (hlen > sizeof (struct ip) && ip_dooptions(m))
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157 | f0cbd3ec | bellard | * goto next;
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158 | f0cbd3ec | bellard | */
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159 | f0cbd3ec | bellard | /*
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160 | f0cbd3ec | bellard | * If offset or IP_MF are set, must reassemble.
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161 | f0cbd3ec | bellard | * Otherwise, nothing need be done.
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162 | f0cbd3ec | bellard | * (We could look in the reassembly queue to see
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163 | f0cbd3ec | bellard | * if the packet was previously fragmented,
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164 | f0cbd3ec | bellard | * but it's not worth the time; just let them time out.)
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165 | 5fafdf24 | ths | *
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166 | f0cbd3ec | bellard | * XXX This should fail, don't fragment yet
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167 | f0cbd3ec | bellard | */
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168 | f0cbd3ec | bellard | if (ip->ip_off &~ IP_DF) {
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169 | f0cbd3ec | bellard | register struct ipq *fp; |
170 | f0cbd3ec | bellard | /*
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171 | f0cbd3ec | bellard | * Look for queue of fragments
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172 | f0cbd3ec | bellard | * of this datagram.
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173 | f0cbd3ec | bellard | */
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174 | f0cbd3ec | bellard | for (fp = (struct ipq *) ipq.next; fp != &ipq; |
175 | f0cbd3ec | bellard | fp = (struct ipq *) fp->next)
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176 | f0cbd3ec | bellard | if (ip->ip_id == fp->ipq_id &&
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177 | f0cbd3ec | bellard | ip->ip_src.s_addr == fp->ipq_src.s_addr && |
178 | f0cbd3ec | bellard | ip->ip_dst.s_addr == fp->ipq_dst.s_addr && |
179 | f0cbd3ec | bellard | ip->ip_p == fp->ipq_p) |
180 | f0cbd3ec | bellard | goto found;
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181 | f0cbd3ec | bellard | fp = 0;
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182 | f0cbd3ec | bellard | found:
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183 | f0cbd3ec | bellard | |
184 | f0cbd3ec | bellard | /*
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185 | f0cbd3ec | bellard | * Adjust ip_len to not reflect header,
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186 | f0cbd3ec | bellard | * set ip_mff if more fragments are expected,
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187 | f0cbd3ec | bellard | * convert offset of this to bytes.
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188 | f0cbd3ec | bellard | */
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189 | f0cbd3ec | bellard | ip->ip_len -= hlen; |
190 | f0cbd3ec | bellard | if (ip->ip_off & IP_MF)
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191 | f0cbd3ec | bellard | ((struct ipasfrag *)ip)->ipf_mff |= 1; |
192 | 5fafdf24 | ths | else
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193 | f0cbd3ec | bellard | ((struct ipasfrag *)ip)->ipf_mff &= ~1; |
194 | f0cbd3ec | bellard | |
195 | f0cbd3ec | bellard | ip->ip_off <<= 3;
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196 | f0cbd3ec | bellard | |
197 | f0cbd3ec | bellard | /*
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198 | f0cbd3ec | bellard | * If datagram marked as having more fragments
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199 | f0cbd3ec | bellard | * or if this is not the first fragment,
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200 | f0cbd3ec | bellard | * attempt reassembly; if it succeeds, proceed.
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201 | f0cbd3ec | bellard | */
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202 | f0cbd3ec | bellard | if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) { |
203 | 31a60e22 | blueswir1 | STAT(ipstat.ips_fragments++); |
204 | f0cbd3ec | bellard | ip = ip_reass((struct ipasfrag *)ip, fp);
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205 | f0cbd3ec | bellard | if (ip == 0) |
206 | f0cbd3ec | bellard | return;
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207 | 31a60e22 | blueswir1 | STAT(ipstat.ips_reassembled++); |
208 | f0cbd3ec | bellard | m = dtom(ip); |
209 | f0cbd3ec | bellard | } else
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210 | f0cbd3ec | bellard | if (fp)
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211 | f0cbd3ec | bellard | ip_freef(fp); |
212 | f0cbd3ec | bellard | |
213 | f0cbd3ec | bellard | } else
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214 | f0cbd3ec | bellard | ip->ip_len -= hlen; |
215 | f0cbd3ec | bellard | |
216 | f0cbd3ec | bellard | /*
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217 | f0cbd3ec | bellard | * Switch out to protocol's input routine.
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218 | f0cbd3ec | bellard | */
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219 | 31a60e22 | blueswir1 | STAT(ipstat.ips_delivered++); |
220 | f0cbd3ec | bellard | switch (ip->ip_p) {
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221 | f0cbd3ec | bellard | case IPPROTO_TCP:
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222 | f0cbd3ec | bellard | tcp_input(m, hlen, (struct socket *)NULL); |
223 | f0cbd3ec | bellard | break;
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224 | f0cbd3ec | bellard | case IPPROTO_UDP:
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225 | f0cbd3ec | bellard | udp_input(m, hlen); |
226 | f0cbd3ec | bellard | break;
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227 | f0cbd3ec | bellard | case IPPROTO_ICMP:
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228 | f0cbd3ec | bellard | icmp_input(m, hlen); |
229 | f0cbd3ec | bellard | break;
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230 | f0cbd3ec | bellard | default:
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231 | 31a60e22 | blueswir1 | STAT(ipstat.ips_noproto++); |
232 | f0cbd3ec | bellard | m_free(m); |
233 | f0cbd3ec | bellard | } |
234 | f0cbd3ec | bellard | return;
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235 | f0cbd3ec | bellard | bad:
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236 | f0cbd3ec | bellard | m_freem(m); |
237 | f0cbd3ec | bellard | return;
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238 | f0cbd3ec | bellard | } |
239 | f0cbd3ec | bellard | |
240 | f0cbd3ec | bellard | /*
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241 | f0cbd3ec | bellard | * Take incoming datagram fragment and try to
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242 | f0cbd3ec | bellard | * reassemble it into whole datagram. If a chain for
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243 | f0cbd3ec | bellard | * reassembly of this datagram already exists, then it
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244 | f0cbd3ec | bellard | * is given as fp; otherwise have to make a chain.
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245 | f0cbd3ec | bellard | */
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246 | 9634d903 | blueswir1 | static struct ip * |
247 | 9634d903 | blueswir1 | ip_reass(register struct ipasfrag *ip, register struct ipq *fp) |
248 | f0cbd3ec | bellard | { |
249 | f0cbd3ec | bellard | register struct mbuf *m = dtom(ip); |
250 | f0cbd3ec | bellard | register struct ipasfrag *q; |
251 | f0cbd3ec | bellard | int hlen = ip->ip_hl << 2; |
252 | f0cbd3ec | bellard | int i, next;
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253 | 5fafdf24 | ths | |
254 | f0cbd3ec | bellard | DEBUG_CALL("ip_reass");
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255 | f0cbd3ec | bellard | DEBUG_ARG("ip = %lx", (long)ip); |
256 | f0cbd3ec | bellard | DEBUG_ARG("fp = %lx", (long)fp); |
257 | f0cbd3ec | bellard | DEBUG_ARG("m = %lx", (long)m); |
258 | f0cbd3ec | bellard | |
259 | f0cbd3ec | bellard | /*
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260 | f0cbd3ec | bellard | * Presence of header sizes in mbufs
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261 | f0cbd3ec | bellard | * would confuse code below.
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262 | f0cbd3ec | bellard | * Fragment m_data is concatenated.
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263 | f0cbd3ec | bellard | */
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264 | f0cbd3ec | bellard | m->m_data += hlen; |
265 | f0cbd3ec | bellard | m->m_len -= hlen; |
266 | f0cbd3ec | bellard | |
267 | f0cbd3ec | bellard | /*
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268 | f0cbd3ec | bellard | * If first fragment to arrive, create a reassembly queue.
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269 | f0cbd3ec | bellard | */
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270 | f0cbd3ec | bellard | if (fp == 0) { |
271 | f0cbd3ec | bellard | struct mbuf *t;
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272 | f0cbd3ec | bellard | if ((t = m_get()) == NULL) goto dropfrag; |
273 | f0cbd3ec | bellard | fp = mtod(t, struct ipq *);
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274 | f0cbd3ec | bellard | insque_32(fp, &ipq); |
275 | f0cbd3ec | bellard | fp->ipq_ttl = IPFRAGTTL; |
276 | f0cbd3ec | bellard | fp->ipq_p = ip->ip_p; |
277 | f0cbd3ec | bellard | fp->ipq_id = ip->ip_id; |
278 | f0cbd3ec | bellard | fp->ipq_next = fp->ipq_prev = (ipasfragp_32)fp; |
279 | f0cbd3ec | bellard | fp->ipq_src = ((struct ip *)ip)->ip_src;
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280 | f0cbd3ec | bellard | fp->ipq_dst = ((struct ip *)ip)->ip_dst;
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281 | f0cbd3ec | bellard | q = (struct ipasfrag *)fp;
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282 | f0cbd3ec | bellard | goto insert;
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283 | f0cbd3ec | bellard | } |
284 | 5fafdf24 | ths | |
285 | f0cbd3ec | bellard | /*
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286 | f0cbd3ec | bellard | * Find a segment which begins after this one does.
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287 | f0cbd3ec | bellard | */
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288 | f0cbd3ec | bellard | for (q = (struct ipasfrag *)fp->ipq_next; q != (struct ipasfrag *)fp; |
289 | f0cbd3ec | bellard | q = (struct ipasfrag *)q->ipf_next)
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290 | f0cbd3ec | bellard | if (q->ip_off > ip->ip_off)
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291 | f0cbd3ec | bellard | break;
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292 | f0cbd3ec | bellard | |
293 | f0cbd3ec | bellard | /*
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294 | f0cbd3ec | bellard | * If there is a preceding segment, it may provide some of
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295 | f0cbd3ec | bellard | * our data already. If so, drop the data from the incoming
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296 | f0cbd3ec | bellard | * segment. If it provides all of our data, drop us.
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297 | f0cbd3ec | bellard | */
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298 | f0cbd3ec | bellard | if (q->ipf_prev != (ipasfragp_32)fp) {
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299 | f0cbd3ec | bellard | i = ((struct ipasfrag *)(q->ipf_prev))->ip_off +
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300 | f0cbd3ec | bellard | ((struct ipasfrag *)(q->ipf_prev))->ip_len - ip->ip_off;
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301 | f0cbd3ec | bellard | if (i > 0) { |
302 | f0cbd3ec | bellard | if (i >= ip->ip_len)
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303 | f0cbd3ec | bellard | goto dropfrag;
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304 | f0cbd3ec | bellard | m_adj(dtom(ip), i); |
305 | f0cbd3ec | bellard | ip->ip_off += i; |
306 | f0cbd3ec | bellard | ip->ip_len -= i; |
307 | f0cbd3ec | bellard | } |
308 | f0cbd3ec | bellard | } |
309 | f0cbd3ec | bellard | |
310 | f0cbd3ec | bellard | /*
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311 | f0cbd3ec | bellard | * While we overlap succeeding segments trim them or,
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312 | f0cbd3ec | bellard | * if they are completely covered, dequeue them.
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313 | f0cbd3ec | bellard | */
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314 | f0cbd3ec | bellard | while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) { |
315 | f0cbd3ec | bellard | i = (ip->ip_off + ip->ip_len) - q->ip_off; |
316 | f0cbd3ec | bellard | if (i < q->ip_len) {
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317 | f0cbd3ec | bellard | q->ip_len -= i; |
318 | f0cbd3ec | bellard | q->ip_off += i; |
319 | f0cbd3ec | bellard | m_adj(dtom(q), i); |
320 | f0cbd3ec | bellard | break;
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321 | f0cbd3ec | bellard | } |
322 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next;
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323 | f0cbd3ec | bellard | m_freem(dtom((struct ipasfrag *) q->ipf_prev));
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324 | f0cbd3ec | bellard | ip_deq((struct ipasfrag *) q->ipf_prev);
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325 | f0cbd3ec | bellard | } |
326 | f0cbd3ec | bellard | |
327 | f0cbd3ec | bellard | insert:
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328 | f0cbd3ec | bellard | /*
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329 | f0cbd3ec | bellard | * Stick new segment in its place;
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330 | f0cbd3ec | bellard | * check for complete reassembly.
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331 | f0cbd3ec | bellard | */
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332 | f0cbd3ec | bellard | ip_enq(ip, (struct ipasfrag *) q->ipf_prev);
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333 | f0cbd3ec | bellard | next = 0;
|
334 | f0cbd3ec | bellard | for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp; |
335 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next) {
|
336 | f0cbd3ec | bellard | if (q->ip_off != next)
|
337 | f0cbd3ec | bellard | return (0); |
338 | f0cbd3ec | bellard | next += q->ip_len; |
339 | f0cbd3ec | bellard | } |
340 | f0cbd3ec | bellard | if (((struct ipasfrag *)(q->ipf_prev))->ipf_mff & 1) |
341 | f0cbd3ec | bellard | return (0); |
342 | f0cbd3ec | bellard | |
343 | f0cbd3ec | bellard | /*
|
344 | f0cbd3ec | bellard | * Reassembly is complete; concatenate fragments.
|
345 | f0cbd3ec | bellard | */
|
346 | f0cbd3ec | bellard | q = (struct ipasfrag *) fp->ipq_next;
|
347 | f0cbd3ec | bellard | m = dtom(q); |
348 | f0cbd3ec | bellard | |
349 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next;
|
350 | f0cbd3ec | bellard | while (q != (struct ipasfrag *)fp) { |
351 | f0cbd3ec | bellard | struct mbuf *t;
|
352 | f0cbd3ec | bellard | t = dtom(q); |
353 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next;
|
354 | fedc54ad | bellard | m_cat(m, t); |
355 | f0cbd3ec | bellard | } |
356 | f0cbd3ec | bellard | |
357 | f0cbd3ec | bellard | /*
|
358 | f0cbd3ec | bellard | * Create header for new ip packet by
|
359 | f0cbd3ec | bellard | * modifying header of first packet;
|
360 | f0cbd3ec | bellard | * dequeue and discard fragment reassembly header.
|
361 | f0cbd3ec | bellard | * Make header visible.
|
362 | f0cbd3ec | bellard | */
|
363 | f0cbd3ec | bellard | ip = (struct ipasfrag *) fp->ipq_next;
|
364 | f0cbd3ec | bellard | |
365 | f0cbd3ec | bellard | /*
|
366 | f0cbd3ec | bellard | * If the fragments concatenated to an mbuf that's
|
367 | f0cbd3ec | bellard | * bigger than the total size of the fragment, then and
|
368 | f0cbd3ec | bellard | * m_ext buffer was alloced. But fp->ipq_next points to
|
369 | f0cbd3ec | bellard | * the old buffer (in the mbuf), so we must point ip
|
370 | f0cbd3ec | bellard | * into the new buffer.
|
371 | f0cbd3ec | bellard | */
|
372 | f0cbd3ec | bellard | if (m->m_flags & M_EXT) {
|
373 | f0cbd3ec | bellard | int delta;
|
374 | f0cbd3ec | bellard | delta = (char *)ip - m->m_dat;
|
375 | f0cbd3ec | bellard | ip = (struct ipasfrag *)(m->m_ext + delta);
|
376 | f0cbd3ec | bellard | } |
377 | f0cbd3ec | bellard | |
378 | 5fafdf24 | ths | /* DEBUG_ARG("ip = %lx", (long)ip);
|
379 | f0cbd3ec | bellard | * ip=(struct ipasfrag *)m->m_data; */
|
380 | f0cbd3ec | bellard | |
381 | f0cbd3ec | bellard | ip->ip_len = next; |
382 | f0cbd3ec | bellard | ip->ipf_mff &= ~1;
|
383 | f0cbd3ec | bellard | ((struct ip *)ip)->ip_src = fp->ipq_src;
|
384 | f0cbd3ec | bellard | ((struct ip *)ip)->ip_dst = fp->ipq_dst;
|
385 | f0cbd3ec | bellard | remque_32(fp); |
386 | f0cbd3ec | bellard | (void) m_free(dtom(fp));
|
387 | f0cbd3ec | bellard | m = dtom(ip); |
388 | f0cbd3ec | bellard | m->m_len += (ip->ip_hl << 2);
|
389 | f0cbd3ec | bellard | m->m_data -= (ip->ip_hl << 2);
|
390 | f0cbd3ec | bellard | |
391 | f0cbd3ec | bellard | return ((struct ip *)ip); |
392 | f0cbd3ec | bellard | |
393 | f0cbd3ec | bellard | dropfrag:
|
394 | 31a60e22 | blueswir1 | STAT(ipstat.ips_fragdropped++); |
395 | f0cbd3ec | bellard | m_freem(m); |
396 | f0cbd3ec | bellard | return (0); |
397 | f0cbd3ec | bellard | } |
398 | f0cbd3ec | bellard | |
399 | f0cbd3ec | bellard | /*
|
400 | f0cbd3ec | bellard | * Free a fragment reassembly header and all
|
401 | f0cbd3ec | bellard | * associated datagrams.
|
402 | f0cbd3ec | bellard | */
|
403 | 9634d903 | blueswir1 | static void |
404 | 9634d903 | blueswir1 | ip_freef(struct ipq *fp)
|
405 | f0cbd3ec | bellard | { |
406 | f0cbd3ec | bellard | register struct ipasfrag *q, *p; |
407 | f0cbd3ec | bellard | |
408 | f0cbd3ec | bellard | for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp; |
409 | f0cbd3ec | bellard | q = p) { |
410 | f0cbd3ec | bellard | p = (struct ipasfrag *) q->ipf_next;
|
411 | f0cbd3ec | bellard | ip_deq(q); |
412 | f0cbd3ec | bellard | m_freem(dtom(q)); |
413 | f0cbd3ec | bellard | } |
414 | f0cbd3ec | bellard | remque_32(fp); |
415 | f0cbd3ec | bellard | (void) m_free(dtom(fp));
|
416 | f0cbd3ec | bellard | } |
417 | f0cbd3ec | bellard | |
418 | f0cbd3ec | bellard | /*
|
419 | f0cbd3ec | bellard | * Put an ip fragment on a reassembly chain.
|
420 | f0cbd3ec | bellard | * Like insque, but pointers in middle of structure.
|
421 | f0cbd3ec | bellard | */
|
422 | 9634d903 | blueswir1 | static void |
423 | 9634d903 | blueswir1 | ip_enq(register struct ipasfrag *p, register struct ipasfrag *prev) |
424 | f0cbd3ec | bellard | { |
425 | f0cbd3ec | bellard | DEBUG_CALL("ip_enq");
|
426 | f0cbd3ec | bellard | DEBUG_ARG("prev = %lx", (long)prev); |
427 | f0cbd3ec | bellard | p->ipf_prev = (ipasfragp_32) prev; |
428 | f0cbd3ec | bellard | p->ipf_next = prev->ipf_next; |
429 | f0cbd3ec | bellard | ((struct ipasfrag *)(prev->ipf_next))->ipf_prev = (ipasfragp_32) p;
|
430 | f0cbd3ec | bellard | prev->ipf_next = (ipasfragp_32) p; |
431 | f0cbd3ec | bellard | } |
432 | f0cbd3ec | bellard | |
433 | f0cbd3ec | bellard | /*
|
434 | f0cbd3ec | bellard | * To ip_enq as remque is to insque.
|
435 | f0cbd3ec | bellard | */
|
436 | 9634d903 | blueswir1 | static void |
437 | 9634d903 | blueswir1 | ip_deq(register struct ipasfrag *p) |
438 | f0cbd3ec | bellard | { |
439 | f0cbd3ec | bellard | ((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
|
440 | f0cbd3ec | bellard | ((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
|
441 | f0cbd3ec | bellard | } |
442 | f0cbd3ec | bellard | |
443 | f0cbd3ec | bellard | /*
|
444 | f0cbd3ec | bellard | * IP timer processing;
|
445 | f0cbd3ec | bellard | * if a timer expires on a reassembly
|
446 | f0cbd3ec | bellard | * queue, discard it.
|
447 | f0cbd3ec | bellard | */
|
448 | f0cbd3ec | bellard | void
|
449 | f0cbd3ec | bellard | ip_slowtimo() |
450 | f0cbd3ec | bellard | { |
451 | f0cbd3ec | bellard | register struct ipq *fp; |
452 | 5fafdf24 | ths | |
453 | f0cbd3ec | bellard | DEBUG_CALL("ip_slowtimo");
|
454 | 5fafdf24 | ths | |
455 | f0cbd3ec | bellard | fp = (struct ipq *) ipq.next;
|
456 | f0cbd3ec | bellard | if (fp == 0) |
457 | f0cbd3ec | bellard | return;
|
458 | f0cbd3ec | bellard | |
459 | f0cbd3ec | bellard | while (fp != &ipq) {
|
460 | f0cbd3ec | bellard | --fp->ipq_ttl; |
461 | f0cbd3ec | bellard | fp = (struct ipq *) fp->next;
|
462 | f0cbd3ec | bellard | if (((struct ipq *)(fp->prev))->ipq_ttl == 0) { |
463 | 31a60e22 | blueswir1 | STAT(ipstat.ips_fragtimeout++); |
464 | f0cbd3ec | bellard | ip_freef((struct ipq *) fp->prev);
|
465 | f0cbd3ec | bellard | } |
466 | f0cbd3ec | bellard | } |
467 | f0cbd3ec | bellard | } |
468 | f0cbd3ec | bellard | |
469 | f0cbd3ec | bellard | /*
|
470 | f0cbd3ec | bellard | * Do option processing on a datagram,
|
471 | f0cbd3ec | bellard | * possibly discarding it if bad options are encountered,
|
472 | f0cbd3ec | bellard | * or forwarding it if source-routed.
|
473 | f0cbd3ec | bellard | * Returns 1 if packet has been forwarded/freed,
|
474 | f0cbd3ec | bellard | * 0 if the packet should be processed further.
|
475 | f0cbd3ec | bellard | */
|
476 | f0cbd3ec | bellard | |
477 | f0cbd3ec | bellard | #ifdef notdef
|
478 | f0cbd3ec | bellard | |
479 | f0cbd3ec | bellard | int
|
480 | f0cbd3ec | bellard | ip_dooptions(m) |
481 | f0cbd3ec | bellard | struct mbuf *m;
|
482 | f0cbd3ec | bellard | { |
483 | f0cbd3ec | bellard | register struct ip *ip = mtod(m, struct ip *); |
484 | f0cbd3ec | bellard | register u_char *cp;
|
485 | f0cbd3ec | bellard | register struct ip_timestamp *ipt; |
486 | f0cbd3ec | bellard | register struct in_ifaddr *ia; |
487 | f0cbd3ec | bellard | /* int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; */
|
488 | f0cbd3ec | bellard | int opt, optlen, cnt, off, code, type, forward = 0; |
489 | f0cbd3ec | bellard | struct in_addr *sin, dst;
|
490 | f0cbd3ec | bellard | typedef u_int32_t n_time;
|
491 | f0cbd3ec | bellard | n_time ntime; |
492 | f0cbd3ec | bellard | |
493 | f0cbd3ec | bellard | dst = ip->ip_dst; |
494 | f0cbd3ec | bellard | cp = (u_char *)(ip + 1);
|
495 | f0cbd3ec | bellard | cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
496 | f0cbd3ec | bellard | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
497 | f0cbd3ec | bellard | opt = cp[IPOPT_OPTVAL]; |
498 | f0cbd3ec | bellard | if (opt == IPOPT_EOL)
|
499 | f0cbd3ec | bellard | break;
|
500 | f0cbd3ec | bellard | if (opt == IPOPT_NOP)
|
501 | f0cbd3ec | bellard | optlen = 1;
|
502 | f0cbd3ec | bellard | else {
|
503 | f0cbd3ec | bellard | optlen = cp[IPOPT_OLEN]; |
504 | f0cbd3ec | bellard | if (optlen <= 0 || optlen > cnt) { |
505 | f0cbd3ec | bellard | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
506 | f0cbd3ec | bellard | goto bad;
|
507 | f0cbd3ec | bellard | } |
508 | f0cbd3ec | bellard | } |
509 | f0cbd3ec | bellard | switch (opt) {
|
510 | f0cbd3ec | bellard | |
511 | f0cbd3ec | bellard | default:
|
512 | f0cbd3ec | bellard | break;
|
513 | f0cbd3ec | bellard | |
514 | f0cbd3ec | bellard | /*
|
515 | f0cbd3ec | bellard | * Source routing with record.
|
516 | f0cbd3ec | bellard | * Find interface with current destination address.
|
517 | f0cbd3ec | bellard | * If none on this machine then drop if strictly routed,
|
518 | f0cbd3ec | bellard | * or do nothing if loosely routed.
|
519 | f0cbd3ec | bellard | * Record interface address and bring up next address
|
520 | f0cbd3ec | bellard | * component. If strictly routed make sure next
|
521 | f0cbd3ec | bellard | * address is on directly accessible net.
|
522 | f0cbd3ec | bellard | */
|
523 | f0cbd3ec | bellard | case IPOPT_LSRR:
|
524 | f0cbd3ec | bellard | case IPOPT_SSRR:
|
525 | f0cbd3ec | bellard | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
526 | f0cbd3ec | bellard | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
527 | f0cbd3ec | bellard | goto bad;
|
528 | f0cbd3ec | bellard | } |
529 | f0cbd3ec | bellard | ipaddr.sin_addr = ip->ip_dst; |
530 | f0cbd3ec | bellard | ia = (struct in_ifaddr *)
|
531 | f0cbd3ec | bellard | ifa_ifwithaddr((struct sockaddr *)&ipaddr);
|
532 | f0cbd3ec | bellard | if (ia == 0) { |
533 | f0cbd3ec | bellard | if (opt == IPOPT_SSRR) {
|
534 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
535 | f0cbd3ec | bellard | code = ICMP_UNREACH_SRCFAIL; |
536 | f0cbd3ec | bellard | goto bad;
|
537 | f0cbd3ec | bellard | } |
538 | f0cbd3ec | bellard | /*
|
539 | f0cbd3ec | bellard | * Loose routing, and not at next destination
|
540 | f0cbd3ec | bellard | * yet; nothing to do except forward.
|
541 | f0cbd3ec | bellard | */
|
542 | f0cbd3ec | bellard | break;
|
543 | f0cbd3ec | bellard | } |
544 | f0cbd3ec | bellard | off--; / * 0 origin * /
|
545 | f0cbd3ec | bellard | if (off > optlen - sizeof(struct in_addr)) { |
546 | f0cbd3ec | bellard | /*
|
547 | f0cbd3ec | bellard | * End of source route. Should be for us.
|
548 | f0cbd3ec | bellard | */
|
549 | f0cbd3ec | bellard | save_rte(cp, ip->ip_src); |
550 | f0cbd3ec | bellard | break;
|
551 | f0cbd3ec | bellard | } |
552 | f0cbd3ec | bellard | /*
|
553 | f0cbd3ec | bellard | * locate outgoing interface
|
554 | f0cbd3ec | bellard | */
|
555 | f0cbd3ec | bellard | bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, |
556 | f0cbd3ec | bellard | sizeof(ipaddr.sin_addr));
|
557 | f0cbd3ec | bellard | if (opt == IPOPT_SSRR) {
|
558 | f0cbd3ec | bellard | #define INA struct in_ifaddr * |
559 | f0cbd3ec | bellard | #define SA struct sockaddr * |
560 | f0cbd3ec | bellard | if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) |
561 | f0cbd3ec | bellard | ia = (INA)ifa_ifwithnet((SA)&ipaddr); |
562 | f0cbd3ec | bellard | } else
|
563 | f0cbd3ec | bellard | ia = ip_rtaddr(ipaddr.sin_addr); |
564 | f0cbd3ec | bellard | if (ia == 0) { |
565 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
566 | f0cbd3ec | bellard | code = ICMP_UNREACH_SRCFAIL; |
567 | f0cbd3ec | bellard | goto bad;
|
568 | f0cbd3ec | bellard | } |
569 | f0cbd3ec | bellard | ip->ip_dst = ipaddr.sin_addr; |
570 | f0cbd3ec | bellard | bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
571 | f0cbd3ec | bellard | (caddr_t)(cp + off), sizeof(struct in_addr)); |
572 | f0cbd3ec | bellard | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
573 | f0cbd3ec | bellard | /*
|
574 | f0cbd3ec | bellard | * Let ip_intr's mcast routing check handle mcast pkts
|
575 | f0cbd3ec | bellard | */
|
576 | f0cbd3ec | bellard | forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); |
577 | f0cbd3ec | bellard | break;
|
578 | f0cbd3ec | bellard | |
579 | f0cbd3ec | bellard | case IPOPT_RR:
|
580 | f0cbd3ec | bellard | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
581 | f0cbd3ec | bellard | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
582 | f0cbd3ec | bellard | goto bad;
|
583 | f0cbd3ec | bellard | } |
584 | f0cbd3ec | bellard | /*
|
585 | f0cbd3ec | bellard | * If no space remains, ignore.
|
586 | f0cbd3ec | bellard | */
|
587 | f0cbd3ec | bellard | off--; * 0 origin *
|
588 | f0cbd3ec | bellard | if (off > optlen - sizeof(struct in_addr)) |
589 | f0cbd3ec | bellard | break;
|
590 | f0cbd3ec | bellard | bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, |
591 | f0cbd3ec | bellard | sizeof(ipaddr.sin_addr));
|
592 | f0cbd3ec | bellard | /*
|
593 | f0cbd3ec | bellard | * locate outgoing interface; if we're the destination,
|
594 | f0cbd3ec | bellard | * use the incoming interface (should be same).
|
595 | f0cbd3ec | bellard | */
|
596 | f0cbd3ec | bellard | if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && |
597 | f0cbd3ec | bellard | (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
|
598 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
599 | f0cbd3ec | bellard | code = ICMP_UNREACH_HOST; |
600 | f0cbd3ec | bellard | goto bad;
|
601 | f0cbd3ec | bellard | } |
602 | f0cbd3ec | bellard | bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
603 | f0cbd3ec | bellard | (caddr_t)(cp + off), sizeof(struct in_addr)); |
604 | f0cbd3ec | bellard | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
605 | f0cbd3ec | bellard | break;
|
606 | f0cbd3ec | bellard | |
607 | f0cbd3ec | bellard | case IPOPT_TS:
|
608 | f0cbd3ec | bellard | code = cp - (u_char *)ip; |
609 | f0cbd3ec | bellard | ipt = (struct ip_timestamp *)cp;
|
610 | f0cbd3ec | bellard | if (ipt->ipt_len < 5) |
611 | f0cbd3ec | bellard | goto bad;
|
612 | f0cbd3ec | bellard | if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { |
613 | f0cbd3ec | bellard | if (++ipt->ipt_oflw == 0) |
614 | f0cbd3ec | bellard | goto bad;
|
615 | f0cbd3ec | bellard | break;
|
616 | f0cbd3ec | bellard | } |
617 | f0cbd3ec | bellard | sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); |
618 | f0cbd3ec | bellard | switch (ipt->ipt_flg) {
|
619 | f0cbd3ec | bellard | |
620 | f0cbd3ec | bellard | case IPOPT_TS_TSONLY:
|
621 | f0cbd3ec | bellard | break;
|
622 | f0cbd3ec | bellard | |
623 | f0cbd3ec | bellard | case IPOPT_TS_TSANDADDR:
|
624 | f0cbd3ec | bellard | if (ipt->ipt_ptr + sizeof(n_time) + |
625 | f0cbd3ec | bellard | sizeof(struct in_addr) > ipt->ipt_len) |
626 | f0cbd3ec | bellard | goto bad;
|
627 | f0cbd3ec | bellard | ipaddr.sin_addr = dst; |
628 | f0cbd3ec | bellard | ia = (INA)ifaof_ i f p foraddr((SA)&ipaddr, |
629 | f0cbd3ec | bellard | m->m_pkthdr.rcvif); |
630 | f0cbd3ec | bellard | if (ia == 0) |
631 | f0cbd3ec | bellard | continue;
|
632 | f0cbd3ec | bellard | bcopy((caddr_t)&IA_SIN(ia)->sin_addr, |
633 | f0cbd3ec | bellard | (caddr_t)sin, sizeof(struct in_addr)); |
634 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(struct in_addr); |
635 | f0cbd3ec | bellard | break;
|
636 | f0cbd3ec | bellard | |
637 | f0cbd3ec | bellard | case IPOPT_TS_PRESPEC:
|
638 | f0cbd3ec | bellard | if (ipt->ipt_ptr + sizeof(n_time) + |
639 | f0cbd3ec | bellard | sizeof(struct in_addr) > ipt->ipt_len) |
640 | f0cbd3ec | bellard | goto bad;
|
641 | f0cbd3ec | bellard | bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr, |
642 | f0cbd3ec | bellard | sizeof(struct in_addr)); |
643 | f0cbd3ec | bellard | if (ifa_ifwithaddr((SA)&ipaddr) == 0) |
644 | f0cbd3ec | bellard | continue;
|
645 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(struct in_addr); |
646 | f0cbd3ec | bellard | break;
|
647 | f0cbd3ec | bellard | |
648 | f0cbd3ec | bellard | default:
|
649 | f0cbd3ec | bellard | goto bad;
|
650 | f0cbd3ec | bellard | } |
651 | f0cbd3ec | bellard | ntime = iptime(); |
652 | f0cbd3ec | bellard | bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
|
653 | f0cbd3ec | bellard | sizeof(n_time));
|
654 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(n_time);
|
655 | f0cbd3ec | bellard | } |
656 | f0cbd3ec | bellard | } |
657 | f0cbd3ec | bellard | if (forward) {
|
658 | f0cbd3ec | bellard | ip_forward(m, 1);
|
659 | f0cbd3ec | bellard | return (1); |
660 | f0cbd3ec | bellard | } |
661 | f0cbd3ec | bellard | } |
662 | f0cbd3ec | bellard | } |
663 | f0cbd3ec | bellard | return (0); |
664 | f0cbd3ec | bellard | bad:
|
665 | f0cbd3ec | bellard | /* ip->ip_len -= ip->ip_hl << 2; XXX icmp_error adds in hdr length */
|
666 | f0cbd3ec | bellard | |
667 | f0cbd3ec | bellard | /* Not yet */
|
668 | f0cbd3ec | bellard | icmp_error(m, type, code, 0, 0); |
669 | f0cbd3ec | bellard | |
670 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badoptions++); |
671 | f0cbd3ec | bellard | return (1); |
672 | f0cbd3ec | bellard | } |
673 | f0cbd3ec | bellard | |
674 | f0cbd3ec | bellard | #endif /* notdef */ |
675 | f0cbd3ec | bellard | |
676 | f0cbd3ec | bellard | /*
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677 | f0cbd3ec | bellard | * Strip out IP options, at higher
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678 | f0cbd3ec | bellard | * level protocol in the kernel.
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679 | f0cbd3ec | bellard | * Second argument is buffer to which options
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680 | f0cbd3ec | bellard | * will be moved, and return value is their length.
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681 | f0cbd3ec | bellard | * (XXX) should be deleted; last arg currently ignored.
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682 | f0cbd3ec | bellard | */
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683 | f0cbd3ec | bellard | void
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684 | f0cbd3ec | bellard | ip_stripoptions(m, mopt) |
685 | f0cbd3ec | bellard | register struct mbuf *m; |
686 | f0cbd3ec | bellard | struct mbuf *mopt;
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687 | f0cbd3ec | bellard | { |
688 | f0cbd3ec | bellard | register int i; |
689 | f0cbd3ec | bellard | struct ip *ip = mtod(m, struct ip *); |
690 | f0cbd3ec | bellard | register caddr_t opts;
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691 | f0cbd3ec | bellard | int olen;
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692 | f0cbd3ec | bellard | |
693 | f0cbd3ec | bellard | olen = (ip->ip_hl<<2) - sizeof (struct ip); |
694 | f0cbd3ec | bellard | opts = (caddr_t)(ip + 1);
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695 | f0cbd3ec | bellard | i = m->m_len - (sizeof (struct ip) + olen); |
696 | f0cbd3ec | bellard | memcpy(opts, opts + olen, (unsigned)i);
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697 | f0cbd3ec | bellard | m->m_len -= olen; |
698 | 5fafdf24 | ths | |
699 | f0cbd3ec | bellard | ip->ip_hl = sizeof(struct ip) >> 2; |
700 | f0cbd3ec | bellard | } |