root / slirp / ip_input.c @ c94c8d64
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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 | f0cbd3ec | bellard | *
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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 | f0cbd3ec | bellard | int ip_defttl;
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49 | f0cbd3ec | bellard | struct ipstat ipstat;
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50 | f0cbd3ec | bellard | struct ipq ipq;
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51 | f0cbd3ec | bellard | |
52 | f0cbd3ec | bellard | /*
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53 | f0cbd3ec | bellard | * IP initialization: fill in IP protocol switch table.
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54 | f0cbd3ec | bellard | * All protocols not implemented in kernel go to raw IP protocol handler.
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55 | f0cbd3ec | bellard | */
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56 | f0cbd3ec | bellard | void
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57 | f0cbd3ec | bellard | ip_init() |
58 | f0cbd3ec | bellard | { |
59 | f0cbd3ec | bellard | ipq.next = ipq.prev = (ipqp_32)&ipq; |
60 | f0cbd3ec | bellard | ip_id = tt.tv_sec & 0xffff;
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61 | f0cbd3ec | bellard | udp_init(); |
62 | f0cbd3ec | bellard | tcp_init(); |
63 | f0cbd3ec | bellard | ip_defttl = IPDEFTTL; |
64 | f0cbd3ec | bellard | } |
65 | f0cbd3ec | bellard | |
66 | f0cbd3ec | bellard | /*
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67 | f0cbd3ec | bellard | * Ip input routine. Checksum and byte swap header. If fragmented
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68 | f0cbd3ec | bellard | * try to reassemble. Process options. Pass to next level.
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69 | f0cbd3ec | bellard | */
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70 | f0cbd3ec | bellard | void
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71 | f0cbd3ec | bellard | ip_input(m) |
72 | f0cbd3ec | bellard | struct mbuf *m;
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73 | f0cbd3ec | bellard | { |
74 | f0cbd3ec | bellard | register struct ip *ip; |
75 | f0cbd3ec | bellard | int hlen;
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76 | f0cbd3ec | bellard | |
77 | f0cbd3ec | bellard | DEBUG_CALL("ip_input");
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78 | f0cbd3ec | bellard | DEBUG_ARG("m = %lx", (long)m); |
79 | f0cbd3ec | bellard | DEBUG_ARG("m_len = %d", m->m_len);
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80 | f0cbd3ec | bellard | |
81 | f0cbd3ec | bellard | ipstat.ips_total++; |
82 | f0cbd3ec | bellard | |
83 | f0cbd3ec | bellard | if (m->m_len < sizeof (struct ip)) { |
84 | f0cbd3ec | bellard | ipstat.ips_toosmall++; |
85 | f0cbd3ec | bellard | return;
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86 | f0cbd3ec | bellard | } |
87 | f0cbd3ec | bellard | |
88 | f0cbd3ec | bellard | ip = mtod(m, struct ip *);
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89 | f0cbd3ec | bellard | |
90 | f0cbd3ec | bellard | if (ip->ip_v != IPVERSION) {
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91 | f0cbd3ec | bellard | ipstat.ips_badvers++; |
92 | f0cbd3ec | bellard | goto bad;
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93 | f0cbd3ec | bellard | } |
94 | f0cbd3ec | bellard | |
95 | f0cbd3ec | bellard | hlen = ip->ip_hl << 2;
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96 | f0cbd3ec | bellard | if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */ |
97 | f0cbd3ec | bellard | ipstat.ips_badhlen++; /* or packet too short */
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98 | f0cbd3ec | bellard | goto bad;
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99 | f0cbd3ec | bellard | } |
100 | f0cbd3ec | bellard | |
101 | f0cbd3ec | bellard | /* keep ip header intact for ICMP reply
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102 | f0cbd3ec | bellard | * ip->ip_sum = cksum(m, hlen);
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103 | f0cbd3ec | bellard | * if (ip->ip_sum) {
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104 | f0cbd3ec | bellard | */
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105 | f0cbd3ec | bellard | if(cksum(m,hlen)) {
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106 | f0cbd3ec | bellard | ipstat.ips_badsum++; |
107 | f0cbd3ec | bellard | goto bad;
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108 | f0cbd3ec | bellard | } |
109 | f0cbd3ec | bellard | |
110 | f0cbd3ec | bellard | /*
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111 | f0cbd3ec | bellard | * Convert fields to host representation.
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112 | f0cbd3ec | bellard | */
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113 | f0cbd3ec | bellard | NTOHS(ip->ip_len); |
114 | f0cbd3ec | bellard | if (ip->ip_len < hlen) {
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115 | f0cbd3ec | bellard | ipstat.ips_badlen++; |
116 | f0cbd3ec | bellard | goto bad;
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117 | f0cbd3ec | bellard | } |
118 | f0cbd3ec | bellard | NTOHS(ip->ip_id); |
119 | f0cbd3ec | bellard | NTOHS(ip->ip_off); |
120 | f0cbd3ec | bellard | |
121 | f0cbd3ec | bellard | /*
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122 | f0cbd3ec | bellard | * Check that the amount of data in the buffers
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123 | f0cbd3ec | bellard | * is as at least much as the IP header would have us expect.
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124 | f0cbd3ec | bellard | * Trim mbufs if longer than we expect.
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125 | f0cbd3ec | bellard | * Drop packet if shorter than we expect.
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126 | f0cbd3ec | bellard | */
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127 | f0cbd3ec | bellard | if (m->m_len < ip->ip_len) {
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128 | f0cbd3ec | bellard | ipstat.ips_tooshort++; |
129 | f0cbd3ec | bellard | goto bad;
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130 | f0cbd3ec | bellard | } |
131 | f0cbd3ec | bellard | /* Should drop packet if mbuf too long? hmmm... */
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132 | f0cbd3ec | bellard | if (m->m_len > ip->ip_len)
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133 | f0cbd3ec | bellard | m_adj(m, ip->ip_len - m->m_len); |
134 | f0cbd3ec | bellard | |
135 | f0cbd3ec | bellard | /* check ip_ttl for a correct ICMP reply */
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136 | f0cbd3ec | bellard | if(ip->ip_ttl==0 || ip->ip_ttl==1) { |
137 | f0cbd3ec | bellard | icmp_error(m, ICMP_TIMXCEED,ICMP_TIMXCEED_INTRANS, 0,"ttl"); |
138 | f0cbd3ec | bellard | goto bad;
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139 | f0cbd3ec | bellard | } |
140 | f0cbd3ec | bellard | |
141 | f0cbd3ec | bellard | /*
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142 | f0cbd3ec | bellard | * Process options and, if not destined for us,
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143 | f0cbd3ec | bellard | * ship it on. ip_dooptions returns 1 when an
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144 | f0cbd3ec | bellard | * error was detected (causing an icmp message
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145 | f0cbd3ec | bellard | * to be sent and the original packet to be freed).
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146 | f0cbd3ec | bellard | */
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147 | f0cbd3ec | bellard | /* We do no IP options */
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148 | f0cbd3ec | bellard | /* if (hlen > sizeof (struct ip) && ip_dooptions(m))
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149 | f0cbd3ec | bellard | * goto next;
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150 | f0cbd3ec | bellard | */
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151 | f0cbd3ec | bellard | /*
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152 | f0cbd3ec | bellard | * If offset or IP_MF are set, must reassemble.
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153 | f0cbd3ec | bellard | * Otherwise, nothing need be done.
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154 | f0cbd3ec | bellard | * (We could look in the reassembly queue to see
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155 | f0cbd3ec | bellard | * if the packet was previously fragmented,
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156 | f0cbd3ec | bellard | * but it's not worth the time; just let them time out.)
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157 | f0cbd3ec | bellard | *
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158 | f0cbd3ec | bellard | * XXX This should fail, don't fragment yet
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159 | f0cbd3ec | bellard | */
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160 | f0cbd3ec | bellard | if (ip->ip_off &~ IP_DF) {
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161 | f0cbd3ec | bellard | register struct ipq *fp; |
162 | f0cbd3ec | bellard | /*
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163 | f0cbd3ec | bellard | * Look for queue of fragments
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164 | f0cbd3ec | bellard | * of this datagram.
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165 | f0cbd3ec | bellard | */
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166 | f0cbd3ec | bellard | for (fp = (struct ipq *) ipq.next; fp != &ipq; |
167 | f0cbd3ec | bellard | fp = (struct ipq *) fp->next)
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168 | f0cbd3ec | bellard | if (ip->ip_id == fp->ipq_id &&
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169 | f0cbd3ec | bellard | ip->ip_src.s_addr == fp->ipq_src.s_addr && |
170 | f0cbd3ec | bellard | ip->ip_dst.s_addr == fp->ipq_dst.s_addr && |
171 | f0cbd3ec | bellard | ip->ip_p == fp->ipq_p) |
172 | f0cbd3ec | bellard | goto found;
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173 | f0cbd3ec | bellard | fp = 0;
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174 | f0cbd3ec | bellard | found:
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175 | f0cbd3ec | bellard | |
176 | f0cbd3ec | bellard | /*
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177 | f0cbd3ec | bellard | * Adjust ip_len to not reflect header,
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178 | f0cbd3ec | bellard | * set ip_mff if more fragments are expected,
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179 | f0cbd3ec | bellard | * convert offset of this to bytes.
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180 | f0cbd3ec | bellard | */
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181 | f0cbd3ec | bellard | ip->ip_len -= hlen; |
182 | f0cbd3ec | bellard | if (ip->ip_off & IP_MF)
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183 | f0cbd3ec | bellard | ((struct ipasfrag *)ip)->ipf_mff |= 1; |
184 | f0cbd3ec | bellard | else
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185 | f0cbd3ec | bellard | ((struct ipasfrag *)ip)->ipf_mff &= ~1; |
186 | f0cbd3ec | bellard | |
187 | f0cbd3ec | bellard | ip->ip_off <<= 3;
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188 | f0cbd3ec | bellard | |
189 | f0cbd3ec | bellard | /*
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190 | f0cbd3ec | bellard | * If datagram marked as having more fragments
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191 | f0cbd3ec | bellard | * or if this is not the first fragment,
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192 | f0cbd3ec | bellard | * attempt reassembly; if it succeeds, proceed.
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193 | f0cbd3ec | bellard | */
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194 | f0cbd3ec | bellard | if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) { |
195 | f0cbd3ec | bellard | ipstat.ips_fragments++; |
196 | f0cbd3ec | bellard | ip = ip_reass((struct ipasfrag *)ip, fp);
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197 | f0cbd3ec | bellard | if (ip == 0) |
198 | f0cbd3ec | bellard | return;
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199 | f0cbd3ec | bellard | ipstat.ips_reassembled++; |
200 | f0cbd3ec | bellard | m = dtom(ip); |
201 | f0cbd3ec | bellard | } else
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202 | f0cbd3ec | bellard | if (fp)
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203 | f0cbd3ec | bellard | ip_freef(fp); |
204 | f0cbd3ec | bellard | |
205 | f0cbd3ec | bellard | } else
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206 | f0cbd3ec | bellard | ip->ip_len -= hlen; |
207 | f0cbd3ec | bellard | |
208 | f0cbd3ec | bellard | /*
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209 | f0cbd3ec | bellard | * Switch out to protocol's input routine.
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210 | f0cbd3ec | bellard | */
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211 | f0cbd3ec | bellard | ipstat.ips_delivered++; |
212 | f0cbd3ec | bellard | switch (ip->ip_p) {
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213 | f0cbd3ec | bellard | case IPPROTO_TCP:
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214 | f0cbd3ec | bellard | tcp_input(m, hlen, (struct socket *)NULL); |
215 | f0cbd3ec | bellard | break;
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216 | f0cbd3ec | bellard | case IPPROTO_UDP:
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217 | f0cbd3ec | bellard | udp_input(m, hlen); |
218 | f0cbd3ec | bellard | break;
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219 | f0cbd3ec | bellard | case IPPROTO_ICMP:
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220 | f0cbd3ec | bellard | icmp_input(m, hlen); |
221 | f0cbd3ec | bellard | break;
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222 | f0cbd3ec | bellard | default:
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223 | f0cbd3ec | bellard | ipstat.ips_noproto++; |
224 | f0cbd3ec | bellard | m_free(m); |
225 | f0cbd3ec | bellard | } |
226 | f0cbd3ec | bellard | return;
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227 | f0cbd3ec | bellard | bad:
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228 | f0cbd3ec | bellard | m_freem(m); |
229 | f0cbd3ec | bellard | return;
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230 | f0cbd3ec | bellard | } |
231 | f0cbd3ec | bellard | |
232 | f0cbd3ec | bellard | /*
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233 | f0cbd3ec | bellard | * Take incoming datagram fragment and try to
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234 | f0cbd3ec | bellard | * reassemble it into whole datagram. If a chain for
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235 | f0cbd3ec | bellard | * reassembly of this datagram already exists, then it
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236 | f0cbd3ec | bellard | * is given as fp; otherwise have to make a chain.
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237 | f0cbd3ec | bellard | */
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238 | f0cbd3ec | bellard | struct ip *
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239 | f0cbd3ec | bellard | ip_reass(ip, fp) |
240 | f0cbd3ec | bellard | register struct ipasfrag *ip; |
241 | f0cbd3ec | bellard | register struct ipq *fp; |
242 | f0cbd3ec | bellard | { |
243 | f0cbd3ec | bellard | register struct mbuf *m = dtom(ip); |
244 | f0cbd3ec | bellard | register struct ipasfrag *q; |
245 | f0cbd3ec | bellard | int hlen = ip->ip_hl << 2; |
246 | f0cbd3ec | bellard | int i, next;
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247 | f0cbd3ec | bellard | |
248 | f0cbd3ec | bellard | DEBUG_CALL("ip_reass");
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249 | f0cbd3ec | bellard | DEBUG_ARG("ip = %lx", (long)ip); |
250 | f0cbd3ec | bellard | DEBUG_ARG("fp = %lx", (long)fp); |
251 | f0cbd3ec | bellard | DEBUG_ARG("m = %lx", (long)m); |
252 | f0cbd3ec | bellard | |
253 | f0cbd3ec | bellard | /*
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254 | f0cbd3ec | bellard | * Presence of header sizes in mbufs
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255 | f0cbd3ec | bellard | * would confuse code below.
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256 | f0cbd3ec | bellard | * Fragment m_data is concatenated.
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257 | f0cbd3ec | bellard | */
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258 | f0cbd3ec | bellard | m->m_data += hlen; |
259 | f0cbd3ec | bellard | m->m_len -= hlen; |
260 | f0cbd3ec | bellard | |
261 | f0cbd3ec | bellard | /*
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262 | f0cbd3ec | bellard | * If first fragment to arrive, create a reassembly queue.
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263 | f0cbd3ec | bellard | */
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264 | f0cbd3ec | bellard | if (fp == 0) { |
265 | f0cbd3ec | bellard | struct mbuf *t;
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266 | f0cbd3ec | bellard | if ((t = m_get()) == NULL) goto dropfrag; |
267 | f0cbd3ec | bellard | fp = mtod(t, struct ipq *);
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268 | f0cbd3ec | bellard | insque_32(fp, &ipq); |
269 | f0cbd3ec | bellard | fp->ipq_ttl = IPFRAGTTL; |
270 | f0cbd3ec | bellard | fp->ipq_p = ip->ip_p; |
271 | f0cbd3ec | bellard | fp->ipq_id = ip->ip_id; |
272 | f0cbd3ec | bellard | fp->ipq_next = fp->ipq_prev = (ipasfragp_32)fp; |
273 | f0cbd3ec | bellard | fp->ipq_src = ((struct ip *)ip)->ip_src;
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274 | f0cbd3ec | bellard | fp->ipq_dst = ((struct ip *)ip)->ip_dst;
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275 | f0cbd3ec | bellard | q = (struct ipasfrag *)fp;
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276 | f0cbd3ec | bellard | goto insert;
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277 | f0cbd3ec | bellard | } |
278 | f0cbd3ec | bellard | |
279 | f0cbd3ec | bellard | /*
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280 | f0cbd3ec | bellard | * Find a segment which begins after this one does.
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281 | f0cbd3ec | bellard | */
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282 | f0cbd3ec | bellard | for (q = (struct ipasfrag *)fp->ipq_next; q != (struct ipasfrag *)fp; |
283 | f0cbd3ec | bellard | q = (struct ipasfrag *)q->ipf_next)
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284 | f0cbd3ec | bellard | if (q->ip_off > ip->ip_off)
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285 | f0cbd3ec | bellard | break;
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286 | f0cbd3ec | bellard | |
287 | f0cbd3ec | bellard | /*
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288 | f0cbd3ec | bellard | * If there is a preceding segment, it may provide some of
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289 | f0cbd3ec | bellard | * our data already. If so, drop the data from the incoming
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290 | f0cbd3ec | bellard | * segment. If it provides all of our data, drop us.
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291 | f0cbd3ec | bellard | */
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292 | f0cbd3ec | bellard | if (q->ipf_prev != (ipasfragp_32)fp) {
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293 | f0cbd3ec | bellard | i = ((struct ipasfrag *)(q->ipf_prev))->ip_off +
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294 | f0cbd3ec | bellard | ((struct ipasfrag *)(q->ipf_prev))->ip_len - ip->ip_off;
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295 | f0cbd3ec | bellard | if (i > 0) { |
296 | f0cbd3ec | bellard | if (i >= ip->ip_len)
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297 | f0cbd3ec | bellard | goto dropfrag;
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298 | f0cbd3ec | bellard | m_adj(dtom(ip), i); |
299 | f0cbd3ec | bellard | ip->ip_off += i; |
300 | f0cbd3ec | bellard | ip->ip_len -= i; |
301 | f0cbd3ec | bellard | } |
302 | f0cbd3ec | bellard | } |
303 | f0cbd3ec | bellard | |
304 | f0cbd3ec | bellard | /*
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305 | f0cbd3ec | bellard | * While we overlap succeeding segments trim them or,
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306 | f0cbd3ec | bellard | * if they are completely covered, dequeue them.
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307 | f0cbd3ec | bellard | */
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308 | f0cbd3ec | bellard | while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) { |
309 | f0cbd3ec | bellard | i = (ip->ip_off + ip->ip_len) - q->ip_off; |
310 | f0cbd3ec | bellard | if (i < q->ip_len) {
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311 | f0cbd3ec | bellard | q->ip_len -= i; |
312 | f0cbd3ec | bellard | q->ip_off += i; |
313 | f0cbd3ec | bellard | m_adj(dtom(q), i); |
314 | f0cbd3ec | bellard | break;
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315 | f0cbd3ec | bellard | } |
316 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next;
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317 | f0cbd3ec | bellard | m_freem(dtom((struct ipasfrag *) q->ipf_prev));
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318 | f0cbd3ec | bellard | ip_deq((struct ipasfrag *) q->ipf_prev);
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319 | f0cbd3ec | bellard | } |
320 | f0cbd3ec | bellard | |
321 | f0cbd3ec | bellard | insert:
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322 | f0cbd3ec | bellard | /*
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323 | f0cbd3ec | bellard | * Stick new segment in its place;
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324 | f0cbd3ec | bellard | * check for complete reassembly.
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325 | f0cbd3ec | bellard | */
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326 | f0cbd3ec | bellard | ip_enq(ip, (struct ipasfrag *) q->ipf_prev);
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327 | f0cbd3ec | bellard | next = 0;
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328 | f0cbd3ec | bellard | for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp; |
329 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next) {
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330 | f0cbd3ec | bellard | if (q->ip_off != next)
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331 | f0cbd3ec | bellard | return (0); |
332 | f0cbd3ec | bellard | next += q->ip_len; |
333 | f0cbd3ec | bellard | } |
334 | f0cbd3ec | bellard | if (((struct ipasfrag *)(q->ipf_prev))->ipf_mff & 1) |
335 | f0cbd3ec | bellard | return (0); |
336 | f0cbd3ec | bellard | |
337 | f0cbd3ec | bellard | /*
|
338 | f0cbd3ec | bellard | * Reassembly is complete; concatenate fragments.
|
339 | f0cbd3ec | bellard | */
|
340 | f0cbd3ec | bellard | q = (struct ipasfrag *) fp->ipq_next;
|
341 | f0cbd3ec | bellard | m = dtom(q); |
342 | f0cbd3ec | bellard | |
343 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next;
|
344 | f0cbd3ec | bellard | while (q != (struct ipasfrag *)fp) { |
345 | f0cbd3ec | bellard | struct mbuf *t;
|
346 | f0cbd3ec | bellard | t = dtom(q); |
347 | f0cbd3ec | bellard | m_cat(m, t); |
348 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next;
|
349 | f0cbd3ec | bellard | } |
350 | f0cbd3ec | bellard | |
351 | f0cbd3ec | bellard | /*
|
352 | f0cbd3ec | bellard | * Create header for new ip packet by
|
353 | f0cbd3ec | bellard | * modifying header of first packet;
|
354 | f0cbd3ec | bellard | * dequeue and discard fragment reassembly header.
|
355 | f0cbd3ec | bellard | * Make header visible.
|
356 | f0cbd3ec | bellard | */
|
357 | f0cbd3ec | bellard | ip = (struct ipasfrag *) fp->ipq_next;
|
358 | f0cbd3ec | bellard | |
359 | f0cbd3ec | bellard | /*
|
360 | f0cbd3ec | bellard | * If the fragments concatenated to an mbuf that's
|
361 | f0cbd3ec | bellard | * bigger than the total size of the fragment, then and
|
362 | f0cbd3ec | bellard | * m_ext buffer was alloced. But fp->ipq_next points to
|
363 | f0cbd3ec | bellard | * the old buffer (in the mbuf), so we must point ip
|
364 | f0cbd3ec | bellard | * into the new buffer.
|
365 | f0cbd3ec | bellard | */
|
366 | f0cbd3ec | bellard | if (m->m_flags & M_EXT) {
|
367 | f0cbd3ec | bellard | int delta;
|
368 | f0cbd3ec | bellard | delta = (char *)ip - m->m_dat;
|
369 | f0cbd3ec | bellard | ip = (struct ipasfrag *)(m->m_ext + delta);
|
370 | f0cbd3ec | bellard | } |
371 | f0cbd3ec | bellard | |
372 | f0cbd3ec | bellard | /* DEBUG_ARG("ip = %lx", (long)ip);
|
373 | f0cbd3ec | bellard | * ip=(struct ipasfrag *)m->m_data; */
|
374 | f0cbd3ec | bellard | |
375 | f0cbd3ec | bellard | ip->ip_len = next; |
376 | f0cbd3ec | bellard | ip->ipf_mff &= ~1;
|
377 | f0cbd3ec | bellard | ((struct ip *)ip)->ip_src = fp->ipq_src;
|
378 | f0cbd3ec | bellard | ((struct ip *)ip)->ip_dst = fp->ipq_dst;
|
379 | f0cbd3ec | bellard | remque_32(fp); |
380 | f0cbd3ec | bellard | (void) m_free(dtom(fp));
|
381 | f0cbd3ec | bellard | m = dtom(ip); |
382 | f0cbd3ec | bellard | m->m_len += (ip->ip_hl << 2);
|
383 | f0cbd3ec | bellard | m->m_data -= (ip->ip_hl << 2);
|
384 | f0cbd3ec | bellard | |
385 | f0cbd3ec | bellard | return ((struct ip *)ip); |
386 | f0cbd3ec | bellard | |
387 | f0cbd3ec | bellard | dropfrag:
|
388 | f0cbd3ec | bellard | ipstat.ips_fragdropped++; |
389 | f0cbd3ec | bellard | m_freem(m); |
390 | f0cbd3ec | bellard | return (0); |
391 | f0cbd3ec | bellard | } |
392 | f0cbd3ec | bellard | |
393 | f0cbd3ec | bellard | /*
|
394 | f0cbd3ec | bellard | * Free a fragment reassembly header and all
|
395 | f0cbd3ec | bellard | * associated datagrams.
|
396 | f0cbd3ec | bellard | */
|
397 | f0cbd3ec | bellard | void
|
398 | f0cbd3ec | bellard | ip_freef(fp) |
399 | f0cbd3ec | bellard | struct ipq *fp;
|
400 | f0cbd3ec | bellard | { |
401 | f0cbd3ec | bellard | register struct ipasfrag *q, *p; |
402 | f0cbd3ec | bellard | |
403 | f0cbd3ec | bellard | for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp; |
404 | f0cbd3ec | bellard | q = p) { |
405 | f0cbd3ec | bellard | p = (struct ipasfrag *) q->ipf_next;
|
406 | f0cbd3ec | bellard | ip_deq(q); |
407 | f0cbd3ec | bellard | m_freem(dtom(q)); |
408 | f0cbd3ec | bellard | } |
409 | f0cbd3ec | bellard | remque_32(fp); |
410 | f0cbd3ec | bellard | (void) m_free(dtom(fp));
|
411 | f0cbd3ec | bellard | } |
412 | f0cbd3ec | bellard | |
413 | f0cbd3ec | bellard | /*
|
414 | f0cbd3ec | bellard | * Put an ip fragment on a reassembly chain.
|
415 | f0cbd3ec | bellard | * Like insque, but pointers in middle of structure.
|
416 | f0cbd3ec | bellard | */
|
417 | f0cbd3ec | bellard | void
|
418 | f0cbd3ec | bellard | ip_enq(p, prev) |
419 | f0cbd3ec | bellard | register struct ipasfrag *p, *prev; |
420 | f0cbd3ec | bellard | { |
421 | f0cbd3ec | bellard | DEBUG_CALL("ip_enq");
|
422 | f0cbd3ec | bellard | DEBUG_ARG("prev = %lx", (long)prev); |
423 | f0cbd3ec | bellard | p->ipf_prev = (ipasfragp_32) prev; |
424 | f0cbd3ec | bellard | p->ipf_next = prev->ipf_next; |
425 | f0cbd3ec | bellard | ((struct ipasfrag *)(prev->ipf_next))->ipf_prev = (ipasfragp_32) p;
|
426 | f0cbd3ec | bellard | prev->ipf_next = (ipasfragp_32) p; |
427 | f0cbd3ec | bellard | } |
428 | f0cbd3ec | bellard | |
429 | f0cbd3ec | bellard | /*
|
430 | f0cbd3ec | bellard | * To ip_enq as remque is to insque.
|
431 | f0cbd3ec | bellard | */
|
432 | f0cbd3ec | bellard | void
|
433 | f0cbd3ec | bellard | ip_deq(p) |
434 | f0cbd3ec | bellard | register struct ipasfrag *p; |
435 | f0cbd3ec | bellard | { |
436 | f0cbd3ec | bellard | ((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
|
437 | f0cbd3ec | bellard | ((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
|
438 | f0cbd3ec | bellard | } |
439 | f0cbd3ec | bellard | |
440 | f0cbd3ec | bellard | /*
|
441 | f0cbd3ec | bellard | * IP timer processing;
|
442 | f0cbd3ec | bellard | * if a timer expires on a reassembly
|
443 | f0cbd3ec | bellard | * queue, discard it.
|
444 | f0cbd3ec | bellard | */
|
445 | f0cbd3ec | bellard | void
|
446 | f0cbd3ec | bellard | ip_slowtimo() |
447 | f0cbd3ec | bellard | { |
448 | f0cbd3ec | bellard | register struct ipq *fp; |
449 | f0cbd3ec | bellard | |
450 | f0cbd3ec | bellard | DEBUG_CALL("ip_slowtimo");
|
451 | f0cbd3ec | bellard | |
452 | f0cbd3ec | bellard | fp = (struct ipq *) ipq.next;
|
453 | f0cbd3ec | bellard | if (fp == 0) |
454 | f0cbd3ec | bellard | return;
|
455 | f0cbd3ec | bellard | |
456 | f0cbd3ec | bellard | while (fp != &ipq) {
|
457 | f0cbd3ec | bellard | --fp->ipq_ttl; |
458 | f0cbd3ec | bellard | fp = (struct ipq *) fp->next;
|
459 | f0cbd3ec | bellard | if (((struct ipq *)(fp->prev))->ipq_ttl == 0) { |
460 | f0cbd3ec | bellard | ipstat.ips_fragtimeout++; |
461 | f0cbd3ec | bellard | ip_freef((struct ipq *) fp->prev);
|
462 | f0cbd3ec | bellard | } |
463 | f0cbd3ec | bellard | } |
464 | f0cbd3ec | bellard | } |
465 | f0cbd3ec | bellard | |
466 | f0cbd3ec | bellard | /*
|
467 | f0cbd3ec | bellard | * Do option processing on a datagram,
|
468 | f0cbd3ec | bellard | * possibly discarding it if bad options are encountered,
|
469 | f0cbd3ec | bellard | * or forwarding it if source-routed.
|
470 | f0cbd3ec | bellard | * Returns 1 if packet has been forwarded/freed,
|
471 | f0cbd3ec | bellard | * 0 if the packet should be processed further.
|
472 | f0cbd3ec | bellard | */
|
473 | f0cbd3ec | bellard | |
474 | f0cbd3ec | bellard | #ifdef notdef
|
475 | f0cbd3ec | bellard | |
476 | f0cbd3ec | bellard | int
|
477 | f0cbd3ec | bellard | ip_dooptions(m) |
478 | f0cbd3ec | bellard | struct mbuf *m;
|
479 | f0cbd3ec | bellard | { |
480 | f0cbd3ec | bellard | register struct ip *ip = mtod(m, struct ip *); |
481 | f0cbd3ec | bellard | register u_char *cp;
|
482 | f0cbd3ec | bellard | register struct ip_timestamp *ipt; |
483 | f0cbd3ec | bellard | register struct in_ifaddr *ia; |
484 | f0cbd3ec | bellard | /* int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; */
|
485 | f0cbd3ec | bellard | int opt, optlen, cnt, off, code, type, forward = 0; |
486 | f0cbd3ec | bellard | struct in_addr *sin, dst;
|
487 | f0cbd3ec | bellard | typedef u_int32_t n_time;
|
488 | f0cbd3ec | bellard | n_time ntime; |
489 | f0cbd3ec | bellard | |
490 | f0cbd3ec | bellard | dst = ip->ip_dst; |
491 | f0cbd3ec | bellard | cp = (u_char *)(ip + 1);
|
492 | f0cbd3ec | bellard | cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
493 | f0cbd3ec | bellard | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
494 | f0cbd3ec | bellard | opt = cp[IPOPT_OPTVAL]; |
495 | f0cbd3ec | bellard | if (opt == IPOPT_EOL)
|
496 | f0cbd3ec | bellard | break;
|
497 | f0cbd3ec | bellard | if (opt == IPOPT_NOP)
|
498 | f0cbd3ec | bellard | optlen = 1;
|
499 | f0cbd3ec | bellard | else {
|
500 | f0cbd3ec | bellard | optlen = cp[IPOPT_OLEN]; |
501 | f0cbd3ec | bellard | if (optlen <= 0 || optlen > cnt) { |
502 | f0cbd3ec | bellard | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
503 | f0cbd3ec | bellard | goto bad;
|
504 | f0cbd3ec | bellard | } |
505 | f0cbd3ec | bellard | } |
506 | f0cbd3ec | bellard | switch (opt) {
|
507 | f0cbd3ec | bellard | |
508 | f0cbd3ec | bellard | default:
|
509 | f0cbd3ec | bellard | break;
|
510 | f0cbd3ec | bellard | |
511 | f0cbd3ec | bellard | /*
|
512 | f0cbd3ec | bellard | * Source routing with record.
|
513 | f0cbd3ec | bellard | * Find interface with current destination address.
|
514 | f0cbd3ec | bellard | * If none on this machine then drop if strictly routed,
|
515 | f0cbd3ec | bellard | * or do nothing if loosely routed.
|
516 | f0cbd3ec | bellard | * Record interface address and bring up next address
|
517 | f0cbd3ec | bellard | * component. If strictly routed make sure next
|
518 | f0cbd3ec | bellard | * address is on directly accessible net.
|
519 | f0cbd3ec | bellard | */
|
520 | f0cbd3ec | bellard | case IPOPT_LSRR:
|
521 | f0cbd3ec | bellard | case IPOPT_SSRR:
|
522 | f0cbd3ec | bellard | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
523 | f0cbd3ec | bellard | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
524 | f0cbd3ec | bellard | goto bad;
|
525 | f0cbd3ec | bellard | } |
526 | f0cbd3ec | bellard | ipaddr.sin_addr = ip->ip_dst; |
527 | f0cbd3ec | bellard | ia = (struct in_ifaddr *)
|
528 | f0cbd3ec | bellard | ifa_ifwithaddr((struct sockaddr *)&ipaddr);
|
529 | f0cbd3ec | bellard | if (ia == 0) { |
530 | f0cbd3ec | bellard | if (opt == IPOPT_SSRR) {
|
531 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
532 | f0cbd3ec | bellard | code = ICMP_UNREACH_SRCFAIL; |
533 | f0cbd3ec | bellard | goto bad;
|
534 | f0cbd3ec | bellard | } |
535 | f0cbd3ec | bellard | /*
|
536 | f0cbd3ec | bellard | * Loose routing, and not at next destination
|
537 | f0cbd3ec | bellard | * yet; nothing to do except forward.
|
538 | f0cbd3ec | bellard | */
|
539 | f0cbd3ec | bellard | break;
|
540 | f0cbd3ec | bellard | } |
541 | f0cbd3ec | bellard | off--; / * 0 origin * /
|
542 | f0cbd3ec | bellard | if (off > optlen - sizeof(struct in_addr)) { |
543 | f0cbd3ec | bellard | /*
|
544 | f0cbd3ec | bellard | * End of source route. Should be for us.
|
545 | f0cbd3ec | bellard | */
|
546 | f0cbd3ec | bellard | save_rte(cp, ip->ip_src); |
547 | f0cbd3ec | bellard | break;
|
548 | f0cbd3ec | bellard | } |
549 | f0cbd3ec | bellard | /*
|
550 | f0cbd3ec | bellard | * locate outgoing interface
|
551 | f0cbd3ec | bellard | */
|
552 | f0cbd3ec | bellard | bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, |
553 | f0cbd3ec | bellard | sizeof(ipaddr.sin_addr));
|
554 | f0cbd3ec | bellard | if (opt == IPOPT_SSRR) {
|
555 | f0cbd3ec | bellard | #define INA struct in_ifaddr * |
556 | f0cbd3ec | bellard | #define SA struct sockaddr * |
557 | f0cbd3ec | bellard | if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) |
558 | f0cbd3ec | bellard | ia = (INA)ifa_ifwithnet((SA)&ipaddr); |
559 | f0cbd3ec | bellard | } else
|
560 | f0cbd3ec | bellard | ia = ip_rtaddr(ipaddr.sin_addr); |
561 | f0cbd3ec | bellard | if (ia == 0) { |
562 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
563 | f0cbd3ec | bellard | code = ICMP_UNREACH_SRCFAIL; |
564 | f0cbd3ec | bellard | goto bad;
|
565 | f0cbd3ec | bellard | } |
566 | f0cbd3ec | bellard | ip->ip_dst = ipaddr.sin_addr; |
567 | f0cbd3ec | bellard | bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
568 | f0cbd3ec | bellard | (caddr_t)(cp + off), sizeof(struct in_addr)); |
569 | f0cbd3ec | bellard | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
570 | f0cbd3ec | bellard | /*
|
571 | f0cbd3ec | bellard | * Let ip_intr's mcast routing check handle mcast pkts
|
572 | f0cbd3ec | bellard | */
|
573 | f0cbd3ec | bellard | forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); |
574 | f0cbd3ec | bellard | break;
|
575 | f0cbd3ec | bellard | |
576 | f0cbd3ec | bellard | case IPOPT_RR:
|
577 | f0cbd3ec | bellard | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
578 | f0cbd3ec | bellard | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
579 | f0cbd3ec | bellard | goto bad;
|
580 | f0cbd3ec | bellard | } |
581 | f0cbd3ec | bellard | /*
|
582 | f0cbd3ec | bellard | * If no space remains, ignore.
|
583 | f0cbd3ec | bellard | */
|
584 | f0cbd3ec | bellard | off--; * 0 origin *
|
585 | f0cbd3ec | bellard | if (off > optlen - sizeof(struct in_addr)) |
586 | f0cbd3ec | bellard | break;
|
587 | f0cbd3ec | bellard | bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, |
588 | f0cbd3ec | bellard | sizeof(ipaddr.sin_addr));
|
589 | f0cbd3ec | bellard | /*
|
590 | f0cbd3ec | bellard | * locate outgoing interface; if we're the destination,
|
591 | f0cbd3ec | bellard | * use the incoming interface (should be same).
|
592 | f0cbd3ec | bellard | */
|
593 | f0cbd3ec | bellard | if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && |
594 | f0cbd3ec | bellard | (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
|
595 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
596 | f0cbd3ec | bellard | code = ICMP_UNREACH_HOST; |
597 | f0cbd3ec | bellard | goto bad;
|
598 | f0cbd3ec | bellard | } |
599 | f0cbd3ec | bellard | bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
600 | f0cbd3ec | bellard | (caddr_t)(cp + off), sizeof(struct in_addr)); |
601 | f0cbd3ec | bellard | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
602 | f0cbd3ec | bellard | break;
|
603 | f0cbd3ec | bellard | |
604 | f0cbd3ec | bellard | case IPOPT_TS:
|
605 | f0cbd3ec | bellard | code = cp - (u_char *)ip; |
606 | f0cbd3ec | bellard | ipt = (struct ip_timestamp *)cp;
|
607 | f0cbd3ec | bellard | if (ipt->ipt_len < 5) |
608 | f0cbd3ec | bellard | goto bad;
|
609 | f0cbd3ec | bellard | if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { |
610 | f0cbd3ec | bellard | if (++ipt->ipt_oflw == 0) |
611 | f0cbd3ec | bellard | goto bad;
|
612 | f0cbd3ec | bellard | break;
|
613 | f0cbd3ec | bellard | } |
614 | f0cbd3ec | bellard | sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); |
615 | f0cbd3ec | bellard | switch (ipt->ipt_flg) {
|
616 | f0cbd3ec | bellard | |
617 | f0cbd3ec | bellard | case IPOPT_TS_TSONLY:
|
618 | f0cbd3ec | bellard | break;
|
619 | f0cbd3ec | bellard | |
620 | f0cbd3ec | bellard | case IPOPT_TS_TSANDADDR:
|
621 | f0cbd3ec | bellard | if (ipt->ipt_ptr + sizeof(n_time) + |
622 | f0cbd3ec | bellard | sizeof(struct in_addr) > ipt->ipt_len) |
623 | f0cbd3ec | bellard | goto bad;
|
624 | f0cbd3ec | bellard | ipaddr.sin_addr = dst; |
625 | f0cbd3ec | bellard | ia = (INA)ifaof_ i f p foraddr((SA)&ipaddr, |
626 | f0cbd3ec | bellard | m->m_pkthdr.rcvif); |
627 | f0cbd3ec | bellard | if (ia == 0) |
628 | f0cbd3ec | bellard | continue;
|
629 | f0cbd3ec | bellard | bcopy((caddr_t)&IA_SIN(ia)->sin_addr, |
630 | f0cbd3ec | bellard | (caddr_t)sin, sizeof(struct in_addr)); |
631 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(struct in_addr); |
632 | f0cbd3ec | bellard | break;
|
633 | f0cbd3ec | bellard | |
634 | f0cbd3ec | bellard | case IPOPT_TS_PRESPEC:
|
635 | f0cbd3ec | bellard | if (ipt->ipt_ptr + sizeof(n_time) + |
636 | f0cbd3ec | bellard | sizeof(struct in_addr) > ipt->ipt_len) |
637 | f0cbd3ec | bellard | goto bad;
|
638 | f0cbd3ec | bellard | bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr, |
639 | f0cbd3ec | bellard | sizeof(struct in_addr)); |
640 | f0cbd3ec | bellard | if (ifa_ifwithaddr((SA)&ipaddr) == 0) |
641 | f0cbd3ec | bellard | continue;
|
642 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(struct in_addr); |
643 | f0cbd3ec | bellard | break;
|
644 | f0cbd3ec | bellard | |
645 | f0cbd3ec | bellard | default:
|
646 | f0cbd3ec | bellard | goto bad;
|
647 | f0cbd3ec | bellard | } |
648 | f0cbd3ec | bellard | ntime = iptime(); |
649 | f0cbd3ec | bellard | bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
|
650 | f0cbd3ec | bellard | sizeof(n_time));
|
651 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(n_time);
|
652 | f0cbd3ec | bellard | } |
653 | f0cbd3ec | bellard | } |
654 | f0cbd3ec | bellard | if (forward) {
|
655 | f0cbd3ec | bellard | ip_forward(m, 1);
|
656 | f0cbd3ec | bellard | return (1); |
657 | f0cbd3ec | bellard | } |
658 | f0cbd3ec | bellard | } |
659 | f0cbd3ec | bellard | } |
660 | f0cbd3ec | bellard | return (0); |
661 | f0cbd3ec | bellard | bad:
|
662 | f0cbd3ec | bellard | /* ip->ip_len -= ip->ip_hl << 2; XXX icmp_error adds in hdr length */
|
663 | f0cbd3ec | bellard | |
664 | f0cbd3ec | bellard | /* Not yet */
|
665 | f0cbd3ec | bellard | icmp_error(m, type, code, 0, 0); |
666 | f0cbd3ec | bellard | |
667 | f0cbd3ec | bellard | ipstat.ips_badoptions++; |
668 | f0cbd3ec | bellard | return (1); |
669 | f0cbd3ec | bellard | } |
670 | f0cbd3ec | bellard | |
671 | f0cbd3ec | bellard | #endif /* notdef */ |
672 | f0cbd3ec | bellard | |
673 | f0cbd3ec | bellard | /*
|
674 | f0cbd3ec | bellard | * Strip out IP options, at higher
|
675 | f0cbd3ec | bellard | * level protocol in the kernel.
|
676 | f0cbd3ec | bellard | * Second argument is buffer to which options
|
677 | f0cbd3ec | bellard | * will be moved, and return value is their length.
|
678 | f0cbd3ec | bellard | * (XXX) should be deleted; last arg currently ignored.
|
679 | f0cbd3ec | bellard | */
|
680 | f0cbd3ec | bellard | void
|
681 | f0cbd3ec | bellard | ip_stripoptions(m, mopt) |
682 | f0cbd3ec | bellard | register struct mbuf *m; |
683 | f0cbd3ec | bellard | struct mbuf *mopt;
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684 | f0cbd3ec | bellard | { |
685 | f0cbd3ec | bellard | register int i; |
686 | f0cbd3ec | bellard | struct ip *ip = mtod(m, struct ip *); |
687 | f0cbd3ec | bellard | register caddr_t opts;
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688 | f0cbd3ec | bellard | int olen;
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689 | f0cbd3ec | bellard | |
690 | f0cbd3ec | bellard | olen = (ip->ip_hl<<2) - sizeof (struct ip); |
691 | f0cbd3ec | bellard | opts = (caddr_t)(ip + 1);
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692 | f0cbd3ec | bellard | i = m->m_len - (sizeof (struct ip) + olen); |
693 | f0cbd3ec | bellard | memcpy(opts, opts + olen, (unsigned)i);
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694 | f0cbd3ec | bellard | m->m_len -= olen; |
695 | f0cbd3ec | bellard | |
696 | f0cbd3ec | bellard | ip->ip_hl = sizeof(struct ip) >> 2; |
697 | f0cbd3ec | bellard | } |