root / slirp / ip_input.c @ e3b42536
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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 | 2f5f8996 | aliguori | * 3. Neither the name of the University nor the names of its contributors
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14 | f0cbd3ec | bellard | * may be used to endorse or promote products derived from this software
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15 | f0cbd3ec | bellard | * without specific prior written permission.
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16 | f0cbd3ec | bellard | *
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17 | f0cbd3ec | bellard | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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18 | f0cbd3ec | bellard | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | f0cbd3ec | bellard | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | f0cbd3ec | bellard | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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21 | f0cbd3ec | bellard | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | f0cbd3ec | bellard | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | f0cbd3ec | bellard | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | f0cbd3ec | bellard | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | f0cbd3ec | bellard | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | f0cbd3ec | bellard | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | f0cbd3ec | bellard | * SUCH DAMAGE.
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28 | f0cbd3ec | bellard | *
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29 | f0cbd3ec | bellard | * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
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30 | f0cbd3ec | bellard | * ip_input.c,v 1.11 1994/11/16 10:17:08 jkh Exp
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31 | f0cbd3ec | bellard | */
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32 | f0cbd3ec | bellard | |
33 | f0cbd3ec | bellard | /*
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34 | f0cbd3ec | bellard | * Changes and additions relating to SLiRP are
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35 | f0cbd3ec | bellard | * Copyright (c) 1995 Danny Gasparovski.
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36 | 5fafdf24 | ths | *
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37 | f0cbd3ec | bellard | * Please read the file COPYRIGHT for the
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38 | f0cbd3ec | bellard | * terms and conditions of the copyright.
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39 | f0cbd3ec | bellard | */
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40 | f0cbd3ec | bellard | |
41 | f0cbd3ec | bellard | #include <slirp.h> |
42 | 429d0a3d | blueswir1 | #include <osdep.h> |
43 | f0cbd3ec | bellard | #include "ip_icmp.h" |
44 | f0cbd3ec | bellard | |
45 | 31a60e22 | blueswir1 | #ifdef LOG_ENABLED
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46 | f0cbd3ec | bellard | struct ipstat ipstat;
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47 | 31a60e22 | blueswir1 | #endif
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48 | 31a60e22 | blueswir1 | |
49 | f0cbd3ec | bellard | struct ipq ipq;
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50 | f0cbd3ec | bellard | |
51 | 429d0a3d | blueswir1 | static struct ip *ip_reass(register struct ip *ip, |
52 | 9634d903 | blueswir1 | register struct ipq *fp); |
53 | 9634d903 | blueswir1 | static void ip_freef(struct ipq *fp); |
54 | 9634d903 | blueswir1 | static void ip_enq(register struct ipasfrag *p, |
55 | 9634d903 | blueswir1 | register struct ipasfrag *prev); |
56 | 9634d903 | blueswir1 | static void ip_deq(register struct ipasfrag *p); |
57 | 9634d903 | blueswir1 | |
58 | f0cbd3ec | bellard | /*
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59 | f0cbd3ec | bellard | * IP initialization: fill in IP protocol switch table.
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60 | f0cbd3ec | bellard | * All protocols not implemented in kernel go to raw IP protocol handler.
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61 | f0cbd3ec | bellard | */
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62 | f0cbd3ec | bellard | void
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63 | 511d2b14 | blueswir1 | ip_init(void)
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64 | f0cbd3ec | bellard | { |
65 | 429d0a3d | blueswir1 | ipq.ip_link.next = ipq.ip_link.prev = &ipq.ip_link; |
66 | f0cbd3ec | bellard | ip_id = tt.tv_sec & 0xffff;
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67 | f0cbd3ec | bellard | udp_init(); |
68 | f0cbd3ec | bellard | tcp_init(); |
69 | f0cbd3ec | bellard | } |
70 | f0cbd3ec | bellard | |
71 | f0cbd3ec | bellard | /*
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72 | f0cbd3ec | bellard | * Ip input routine. Checksum and byte swap header. If fragmented
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73 | f0cbd3ec | bellard | * try to reassemble. Process options. Pass to next level.
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74 | f0cbd3ec | bellard | */
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75 | f0cbd3ec | bellard | void
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76 | 511d2b14 | blueswir1 | ip_input(struct mbuf *m)
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77 | f0cbd3ec | bellard | { |
78 | f0cbd3ec | bellard | register struct ip *ip; |
79 | f0cbd3ec | bellard | int hlen;
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80 | 5fafdf24 | ths | |
81 | f0cbd3ec | bellard | DEBUG_CALL("ip_input");
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82 | f0cbd3ec | bellard | DEBUG_ARG("m = %lx", (long)m); |
83 | f0cbd3ec | bellard | DEBUG_ARG("m_len = %d", m->m_len);
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84 | f0cbd3ec | bellard | |
85 | 31a60e22 | blueswir1 | STAT(ipstat.ips_total++); |
86 | 5fafdf24 | ths | |
87 | f0cbd3ec | bellard | if (m->m_len < sizeof (struct ip)) { |
88 | 31a60e22 | blueswir1 | STAT(ipstat.ips_toosmall++); |
89 | f0cbd3ec | bellard | return;
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90 | f0cbd3ec | bellard | } |
91 | 5fafdf24 | ths | |
92 | f0cbd3ec | bellard | ip = mtod(m, struct ip *);
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93 | 5fafdf24 | ths | |
94 | f0cbd3ec | bellard | if (ip->ip_v != IPVERSION) {
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95 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badvers++); |
96 | f0cbd3ec | bellard | goto bad;
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97 | f0cbd3ec | bellard | } |
98 | f0cbd3ec | bellard | |
99 | f0cbd3ec | bellard | hlen = ip->ip_hl << 2;
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100 | f0cbd3ec | bellard | if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */ |
101 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badhlen++); /* or packet too short */
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102 | f0cbd3ec | bellard | goto bad;
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103 | f0cbd3ec | bellard | } |
104 | f0cbd3ec | bellard | |
105 | f0cbd3ec | bellard | /* keep ip header intact for ICMP reply
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106 | 5fafdf24 | ths | * ip->ip_sum = cksum(m, hlen);
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107 | 5fafdf24 | ths | * if (ip->ip_sum) {
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108 | f0cbd3ec | bellard | */
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109 | f0cbd3ec | bellard | if(cksum(m,hlen)) {
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110 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badsum++); |
111 | f0cbd3ec | bellard | goto bad;
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112 | f0cbd3ec | bellard | } |
113 | f0cbd3ec | bellard | |
114 | f0cbd3ec | bellard | /*
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115 | f0cbd3ec | bellard | * Convert fields to host representation.
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116 | f0cbd3ec | bellard | */
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117 | f0cbd3ec | bellard | NTOHS(ip->ip_len); |
118 | f0cbd3ec | bellard | if (ip->ip_len < hlen) {
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119 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badlen++); |
120 | f0cbd3ec | bellard | goto bad;
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121 | f0cbd3ec | bellard | } |
122 | f0cbd3ec | bellard | NTOHS(ip->ip_id); |
123 | f0cbd3ec | bellard | NTOHS(ip->ip_off); |
124 | f0cbd3ec | bellard | |
125 | f0cbd3ec | bellard | /*
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126 | f0cbd3ec | bellard | * Check that the amount of data in the buffers
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127 | f0cbd3ec | bellard | * is as at least much as the IP header would have us expect.
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128 | f0cbd3ec | bellard | * Trim mbufs if longer than we expect.
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129 | f0cbd3ec | bellard | * Drop packet if shorter than we expect.
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130 | f0cbd3ec | bellard | */
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131 | f0cbd3ec | bellard | if (m->m_len < ip->ip_len) {
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132 | 31a60e22 | blueswir1 | STAT(ipstat.ips_tooshort++); |
133 | f0cbd3ec | bellard | goto bad;
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134 | f0cbd3ec | bellard | } |
135 | a9ba3a85 | aliguori | |
136 | a9ba3a85 | aliguori | if (slirp_restrict) {
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137 | a9ba3a85 | aliguori | if (memcmp(&ip->ip_dst.s_addr, &special_addr, 3)) { |
138 | a9ba3a85 | aliguori | if (ip->ip_dst.s_addr == 0xffffffff && ip->ip_p != IPPROTO_UDP) |
139 | a9ba3a85 | aliguori | goto bad;
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140 | a9ba3a85 | aliguori | } else {
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141 | a9ba3a85 | aliguori | int host = ntohl(ip->ip_dst.s_addr) & 0xff; |
142 | a9ba3a85 | aliguori | struct ex_list *ex_ptr;
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143 | a9ba3a85 | aliguori | |
144 | a9ba3a85 | aliguori | if (host == 0xff) |
145 | a9ba3a85 | aliguori | goto bad;
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146 | a9ba3a85 | aliguori | |
147 | a9ba3a85 | aliguori | for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
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148 | a9ba3a85 | aliguori | if (ex_ptr->ex_addr == host)
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149 | a9ba3a85 | aliguori | break;
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150 | a9ba3a85 | aliguori | |
151 | a9ba3a85 | aliguori | if (!ex_ptr)
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152 | a9ba3a85 | aliguori | goto bad;
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153 | a9ba3a85 | aliguori | } |
154 | a9ba3a85 | aliguori | } |
155 | a9ba3a85 | aliguori | |
156 | f0cbd3ec | bellard | /* Should drop packet if mbuf too long? hmmm... */
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157 | f0cbd3ec | bellard | if (m->m_len > ip->ip_len)
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158 | f0cbd3ec | bellard | m_adj(m, ip->ip_len - m->m_len); |
159 | f0cbd3ec | bellard | |
160 | f0cbd3ec | bellard | /* check ip_ttl for a correct ICMP reply */
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161 | f0cbd3ec | bellard | if(ip->ip_ttl==0 || ip->ip_ttl==1) { |
162 | f0cbd3ec | bellard | icmp_error(m, ICMP_TIMXCEED,ICMP_TIMXCEED_INTRANS, 0,"ttl"); |
163 | f0cbd3ec | bellard | goto bad;
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164 | f0cbd3ec | bellard | } |
165 | f0cbd3ec | bellard | |
166 | f0cbd3ec | bellard | /*
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167 | f0cbd3ec | bellard | * Process options and, if not destined for us,
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168 | f0cbd3ec | bellard | * ship it on. ip_dooptions returns 1 when an
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169 | f0cbd3ec | bellard | * error was detected (causing an icmp message
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170 | f0cbd3ec | bellard | * to be sent and the original packet to be freed).
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171 | f0cbd3ec | bellard | */
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172 | f0cbd3ec | bellard | /* We do no IP options */
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173 | f0cbd3ec | bellard | /* if (hlen > sizeof (struct ip) && ip_dooptions(m))
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174 | f0cbd3ec | bellard | * goto next;
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175 | f0cbd3ec | bellard | */
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176 | f0cbd3ec | bellard | /*
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177 | f0cbd3ec | bellard | * If offset or IP_MF are set, must reassemble.
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178 | f0cbd3ec | bellard | * Otherwise, nothing need be done.
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179 | f0cbd3ec | bellard | * (We could look in the reassembly queue to see
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180 | f0cbd3ec | bellard | * if the packet was previously fragmented,
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181 | f0cbd3ec | bellard | * but it's not worth the time; just let them time out.)
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182 | 5fafdf24 | ths | *
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183 | f0cbd3ec | bellard | * XXX This should fail, don't fragment yet
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184 | f0cbd3ec | bellard | */
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185 | f0cbd3ec | bellard | if (ip->ip_off &~ IP_DF) {
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186 | f0cbd3ec | bellard | register struct ipq *fp; |
187 | 429d0a3d | blueswir1 | struct qlink *l;
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188 | f0cbd3ec | bellard | /*
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189 | f0cbd3ec | bellard | * Look for queue of fragments
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190 | f0cbd3ec | bellard | * of this datagram.
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191 | f0cbd3ec | bellard | */
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192 | 429d0a3d | blueswir1 | for (l = ipq.ip_link.next; l != &ipq.ip_link; l = l->next) {
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193 | 429d0a3d | blueswir1 | fp = container_of(l, struct ipq, ip_link);
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194 | 429d0a3d | blueswir1 | if (ip->ip_id == fp->ipq_id &&
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195 | 429d0a3d | blueswir1 | ip->ip_src.s_addr == fp->ipq_src.s_addr && |
196 | 429d0a3d | blueswir1 | ip->ip_dst.s_addr == fp->ipq_dst.s_addr && |
197 | 429d0a3d | blueswir1 | ip->ip_p == fp->ipq_p) |
198 | f0cbd3ec | bellard | goto found;
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199 | 429d0a3d | blueswir1 | } |
200 | 429d0a3d | blueswir1 | fp = NULL;
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201 | f0cbd3ec | bellard | found:
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202 | f0cbd3ec | bellard | |
203 | f0cbd3ec | bellard | /*
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204 | f0cbd3ec | bellard | * Adjust ip_len to not reflect header,
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205 | f0cbd3ec | bellard | * set ip_mff if more fragments are expected,
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206 | f0cbd3ec | bellard | * convert offset of this to bytes.
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207 | f0cbd3ec | bellard | */
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208 | f0cbd3ec | bellard | ip->ip_len -= hlen; |
209 | f0cbd3ec | bellard | if (ip->ip_off & IP_MF)
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210 | 429d0a3d | blueswir1 | ip->ip_tos |= 1;
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211 | 5fafdf24 | ths | else
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212 | 429d0a3d | blueswir1 | ip->ip_tos &= ~1;
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213 | f0cbd3ec | bellard | |
214 | f0cbd3ec | bellard | ip->ip_off <<= 3;
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215 | f0cbd3ec | bellard | |
216 | f0cbd3ec | bellard | /*
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217 | f0cbd3ec | bellard | * If datagram marked as having more fragments
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218 | f0cbd3ec | bellard | * or if this is not the first fragment,
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219 | f0cbd3ec | bellard | * attempt reassembly; if it succeeds, proceed.
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220 | f0cbd3ec | bellard | */
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221 | 429d0a3d | blueswir1 | if (ip->ip_tos & 1 || ip->ip_off) { |
222 | 31a60e22 | blueswir1 | STAT(ipstat.ips_fragments++); |
223 | 429d0a3d | blueswir1 | ip = ip_reass(ip, fp); |
224 | 511d2b14 | blueswir1 | if (ip == NULL) |
225 | f0cbd3ec | bellard | return;
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226 | 31a60e22 | blueswir1 | STAT(ipstat.ips_reassembled++); |
227 | f0cbd3ec | bellard | m = dtom(ip); |
228 | f0cbd3ec | bellard | } else
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229 | f0cbd3ec | bellard | if (fp)
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230 | f0cbd3ec | bellard | ip_freef(fp); |
231 | f0cbd3ec | bellard | |
232 | f0cbd3ec | bellard | } else
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233 | f0cbd3ec | bellard | ip->ip_len -= hlen; |
234 | f0cbd3ec | bellard | |
235 | f0cbd3ec | bellard | /*
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236 | f0cbd3ec | bellard | * Switch out to protocol's input routine.
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237 | f0cbd3ec | bellard | */
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238 | 31a60e22 | blueswir1 | STAT(ipstat.ips_delivered++); |
239 | f0cbd3ec | bellard | switch (ip->ip_p) {
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240 | f0cbd3ec | bellard | case IPPROTO_TCP:
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241 | f0cbd3ec | bellard | tcp_input(m, hlen, (struct socket *)NULL); |
242 | f0cbd3ec | bellard | break;
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243 | f0cbd3ec | bellard | case IPPROTO_UDP:
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244 | f0cbd3ec | bellard | udp_input(m, hlen); |
245 | f0cbd3ec | bellard | break;
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246 | f0cbd3ec | bellard | case IPPROTO_ICMP:
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247 | f0cbd3ec | bellard | icmp_input(m, hlen); |
248 | f0cbd3ec | bellard | break;
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249 | f0cbd3ec | bellard | default:
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250 | 31a60e22 | blueswir1 | STAT(ipstat.ips_noproto++); |
251 | f0cbd3ec | bellard | m_free(m); |
252 | f0cbd3ec | bellard | } |
253 | f0cbd3ec | bellard | return;
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254 | f0cbd3ec | bellard | bad:
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255 | f0cbd3ec | bellard | m_freem(m); |
256 | f0cbd3ec | bellard | return;
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257 | f0cbd3ec | bellard | } |
258 | f0cbd3ec | bellard | |
259 | 429d0a3d | blueswir1 | #define iptofrag(P) ((struct ipasfrag *)(((char*)(P)) - sizeof(struct qlink))) |
260 | 429d0a3d | blueswir1 | #define fragtoip(P) ((struct ip*)(((char*)(P)) + sizeof(struct qlink))) |
261 | f0cbd3ec | bellard | /*
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262 | f0cbd3ec | bellard | * Take incoming datagram fragment and try to
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263 | f0cbd3ec | bellard | * reassemble it into whole datagram. If a chain for
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264 | f0cbd3ec | bellard | * reassembly of this datagram already exists, then it
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265 | f0cbd3ec | bellard | * is given as fp; otherwise have to make a chain.
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266 | f0cbd3ec | bellard | */
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267 | 9634d903 | blueswir1 | static struct ip * |
268 | 429d0a3d | blueswir1 | ip_reass(register struct ip *ip, register struct ipq *fp) |
269 | f0cbd3ec | bellard | { |
270 | f0cbd3ec | bellard | register struct mbuf *m = dtom(ip); |
271 | f0cbd3ec | bellard | register struct ipasfrag *q; |
272 | f0cbd3ec | bellard | int hlen = ip->ip_hl << 2; |
273 | f0cbd3ec | bellard | int i, next;
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274 | 5fafdf24 | ths | |
275 | f0cbd3ec | bellard | DEBUG_CALL("ip_reass");
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276 | f0cbd3ec | bellard | DEBUG_ARG("ip = %lx", (long)ip); |
277 | f0cbd3ec | bellard | DEBUG_ARG("fp = %lx", (long)fp); |
278 | f0cbd3ec | bellard | DEBUG_ARG("m = %lx", (long)m); |
279 | f0cbd3ec | bellard | |
280 | f0cbd3ec | bellard | /*
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281 | f0cbd3ec | bellard | * Presence of header sizes in mbufs
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282 | f0cbd3ec | bellard | * would confuse code below.
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283 | f0cbd3ec | bellard | * Fragment m_data is concatenated.
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284 | f0cbd3ec | bellard | */
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285 | f0cbd3ec | bellard | m->m_data += hlen; |
286 | f0cbd3ec | bellard | m->m_len -= hlen; |
287 | f0cbd3ec | bellard | |
288 | f0cbd3ec | bellard | /*
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289 | f0cbd3ec | bellard | * If first fragment to arrive, create a reassembly queue.
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290 | f0cbd3ec | bellard | */
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291 | 511d2b14 | blueswir1 | if (fp == NULL) { |
292 | f0cbd3ec | bellard | struct mbuf *t;
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293 | f0cbd3ec | bellard | if ((t = m_get()) == NULL) goto dropfrag; |
294 | f0cbd3ec | bellard | fp = mtod(t, struct ipq *);
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295 | 429d0a3d | blueswir1 | insque(&fp->ip_link, &ipq.ip_link); |
296 | f0cbd3ec | bellard | fp->ipq_ttl = IPFRAGTTL; |
297 | f0cbd3ec | bellard | fp->ipq_p = ip->ip_p; |
298 | f0cbd3ec | bellard | fp->ipq_id = ip->ip_id; |
299 | 429d0a3d | blueswir1 | fp->frag_link.next = fp->frag_link.prev = &fp->frag_link; |
300 | 429d0a3d | blueswir1 | fp->ipq_src = ip->ip_src; |
301 | 429d0a3d | blueswir1 | fp->ipq_dst = ip->ip_dst; |
302 | f0cbd3ec | bellard | q = (struct ipasfrag *)fp;
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303 | f0cbd3ec | bellard | goto insert;
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304 | f0cbd3ec | bellard | } |
305 | 5fafdf24 | ths | |
306 | f0cbd3ec | bellard | /*
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307 | f0cbd3ec | bellard | * Find a segment which begins after this one does.
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308 | f0cbd3ec | bellard | */
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309 | 429d0a3d | blueswir1 | for (q = fp->frag_link.next; q != (struct ipasfrag *)&fp->frag_link; |
310 | 429d0a3d | blueswir1 | q = q->ipf_next) |
311 | 429d0a3d | blueswir1 | if (q->ipf_off > ip->ip_off)
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312 | f0cbd3ec | bellard | break;
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313 | f0cbd3ec | bellard | |
314 | f0cbd3ec | bellard | /*
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315 | f0cbd3ec | bellard | * If there is a preceding segment, it may provide some of
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316 | f0cbd3ec | bellard | * our data already. If so, drop the data from the incoming
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317 | f0cbd3ec | bellard | * segment. If it provides all of our data, drop us.
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318 | f0cbd3ec | bellard | */
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319 | 429d0a3d | blueswir1 | if (q->ipf_prev != &fp->frag_link) {
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320 | 429d0a3d | blueswir1 | struct ipasfrag *pq = q->ipf_prev;
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321 | 429d0a3d | blueswir1 | i = pq->ipf_off + pq->ipf_len - ip->ip_off; |
322 | f0cbd3ec | bellard | if (i > 0) { |
323 | f0cbd3ec | bellard | if (i >= ip->ip_len)
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324 | f0cbd3ec | bellard | goto dropfrag;
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325 | f0cbd3ec | bellard | m_adj(dtom(ip), i); |
326 | f0cbd3ec | bellard | ip->ip_off += i; |
327 | f0cbd3ec | bellard | ip->ip_len -= i; |
328 | f0cbd3ec | bellard | } |
329 | f0cbd3ec | bellard | } |
330 | f0cbd3ec | bellard | |
331 | f0cbd3ec | bellard | /*
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332 | f0cbd3ec | bellard | * While we overlap succeeding segments trim them or,
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333 | f0cbd3ec | bellard | * if they are completely covered, dequeue them.
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334 | f0cbd3ec | bellard | */
|
335 | 429d0a3d | blueswir1 | while (q != (struct ipasfrag*)&fp->frag_link && |
336 | 429d0a3d | blueswir1 | ip->ip_off + ip->ip_len > q->ipf_off) { |
337 | 429d0a3d | blueswir1 | i = (ip->ip_off + ip->ip_len) - q->ipf_off; |
338 | 429d0a3d | blueswir1 | if (i < q->ipf_len) {
|
339 | 429d0a3d | blueswir1 | q->ipf_len -= i; |
340 | 429d0a3d | blueswir1 | q->ipf_off += i; |
341 | f0cbd3ec | bellard | m_adj(dtom(q), i); |
342 | f0cbd3ec | bellard | break;
|
343 | f0cbd3ec | bellard | } |
344 | 429d0a3d | blueswir1 | q = q->ipf_next; |
345 | 429d0a3d | blueswir1 | m_freem(dtom(q->ipf_prev)); |
346 | 429d0a3d | blueswir1 | ip_deq(q->ipf_prev); |
347 | f0cbd3ec | bellard | } |
348 | f0cbd3ec | bellard | |
349 | f0cbd3ec | bellard | insert:
|
350 | f0cbd3ec | bellard | /*
|
351 | f0cbd3ec | bellard | * Stick new segment in its place;
|
352 | f0cbd3ec | bellard | * check for complete reassembly.
|
353 | f0cbd3ec | bellard | */
|
354 | 429d0a3d | blueswir1 | ip_enq(iptofrag(ip), q->ipf_prev); |
355 | f0cbd3ec | bellard | next = 0;
|
356 | 429d0a3d | blueswir1 | for (q = fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link; |
357 | 429d0a3d | blueswir1 | q = q->ipf_next) { |
358 | 429d0a3d | blueswir1 | if (q->ipf_off != next)
|
359 | 511d2b14 | blueswir1 | return NULL; |
360 | 429d0a3d | blueswir1 | next += q->ipf_len; |
361 | f0cbd3ec | bellard | } |
362 | 429d0a3d | blueswir1 | if (((struct ipasfrag *)(q->ipf_prev))->ipf_tos & 1) |
363 | 511d2b14 | blueswir1 | return NULL; |
364 | f0cbd3ec | bellard | |
365 | f0cbd3ec | bellard | /*
|
366 | f0cbd3ec | bellard | * Reassembly is complete; concatenate fragments.
|
367 | f0cbd3ec | bellard | */
|
368 | 429d0a3d | blueswir1 | q = fp->frag_link.next; |
369 | f0cbd3ec | bellard | m = dtom(q); |
370 | f0cbd3ec | bellard | |
371 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next;
|
372 | 429d0a3d | blueswir1 | while (q != (struct ipasfrag*)&fp->frag_link) { |
373 | 429d0a3d | blueswir1 | struct mbuf *t = dtom(q);
|
374 | f0cbd3ec | bellard | q = (struct ipasfrag *) q->ipf_next;
|
375 | fedc54ad | bellard | m_cat(m, t); |
376 | f0cbd3ec | bellard | } |
377 | f0cbd3ec | bellard | |
378 | f0cbd3ec | bellard | /*
|
379 | f0cbd3ec | bellard | * Create header for new ip packet by
|
380 | f0cbd3ec | bellard | * modifying header of first packet;
|
381 | f0cbd3ec | bellard | * dequeue and discard fragment reassembly header.
|
382 | f0cbd3ec | bellard | * Make header visible.
|
383 | f0cbd3ec | bellard | */
|
384 | 429d0a3d | blueswir1 | q = fp->frag_link.next; |
385 | f0cbd3ec | bellard | |
386 | f0cbd3ec | bellard | /*
|
387 | f0cbd3ec | bellard | * If the fragments concatenated to an mbuf that's
|
388 | f0cbd3ec | bellard | * bigger than the total size of the fragment, then and
|
389 | f0cbd3ec | bellard | * m_ext buffer was alloced. But fp->ipq_next points to
|
390 | f0cbd3ec | bellard | * the old buffer (in the mbuf), so we must point ip
|
391 | f0cbd3ec | bellard | * into the new buffer.
|
392 | f0cbd3ec | bellard | */
|
393 | f0cbd3ec | bellard | if (m->m_flags & M_EXT) {
|
394 | f2ba730e | blueswir1 | int delta = (char *)q - m->m_dat; |
395 | 429d0a3d | blueswir1 | q = (struct ipasfrag *)(m->m_ext + delta);
|
396 | f0cbd3ec | bellard | } |
397 | f0cbd3ec | bellard | |
398 | 5fafdf24 | ths | /* DEBUG_ARG("ip = %lx", (long)ip);
|
399 | f0cbd3ec | bellard | * ip=(struct ipasfrag *)m->m_data; */
|
400 | f0cbd3ec | bellard | |
401 | 429d0a3d | blueswir1 | ip = fragtoip(q); |
402 | f0cbd3ec | bellard | ip->ip_len = next; |
403 | 429d0a3d | blueswir1 | ip->ip_tos &= ~1;
|
404 | 429d0a3d | blueswir1 | ip->ip_src = fp->ipq_src; |
405 | 429d0a3d | blueswir1 | ip->ip_dst = fp->ipq_dst; |
406 | 429d0a3d | blueswir1 | remque(&fp->ip_link); |
407 | f0cbd3ec | bellard | (void) m_free(dtom(fp));
|
408 | f0cbd3ec | bellard | m->m_len += (ip->ip_hl << 2);
|
409 | f0cbd3ec | bellard | m->m_data -= (ip->ip_hl << 2);
|
410 | f0cbd3ec | bellard | |
411 | 429d0a3d | blueswir1 | return ip;
|
412 | f0cbd3ec | bellard | |
413 | f0cbd3ec | bellard | dropfrag:
|
414 | 31a60e22 | blueswir1 | STAT(ipstat.ips_fragdropped++); |
415 | f0cbd3ec | bellard | m_freem(m); |
416 | 511d2b14 | blueswir1 | return NULL; |
417 | f0cbd3ec | bellard | } |
418 | f0cbd3ec | bellard | |
419 | f0cbd3ec | bellard | /*
|
420 | f0cbd3ec | bellard | * Free a fragment reassembly header and all
|
421 | f0cbd3ec | bellard | * associated datagrams.
|
422 | f0cbd3ec | bellard | */
|
423 | 9634d903 | blueswir1 | static void |
424 | 9634d903 | blueswir1 | ip_freef(struct ipq *fp)
|
425 | f0cbd3ec | bellard | { |
426 | f0cbd3ec | bellard | register struct ipasfrag *q, *p; |
427 | f0cbd3ec | bellard | |
428 | 429d0a3d | blueswir1 | for (q = fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link; q = p) { |
429 | 429d0a3d | blueswir1 | p = q->ipf_next; |
430 | f0cbd3ec | bellard | ip_deq(q); |
431 | f0cbd3ec | bellard | m_freem(dtom(q)); |
432 | f0cbd3ec | bellard | } |
433 | 429d0a3d | blueswir1 | remque(&fp->ip_link); |
434 | f0cbd3ec | bellard | (void) m_free(dtom(fp));
|
435 | f0cbd3ec | bellard | } |
436 | f0cbd3ec | bellard | |
437 | f0cbd3ec | bellard | /*
|
438 | f0cbd3ec | bellard | * Put an ip fragment on a reassembly chain.
|
439 | f0cbd3ec | bellard | * Like insque, but pointers in middle of structure.
|
440 | f0cbd3ec | bellard | */
|
441 | 9634d903 | blueswir1 | static void |
442 | 9634d903 | blueswir1 | ip_enq(register struct ipasfrag *p, register struct ipasfrag *prev) |
443 | f0cbd3ec | bellard | { |
444 | f0cbd3ec | bellard | DEBUG_CALL("ip_enq");
|
445 | f0cbd3ec | bellard | DEBUG_ARG("prev = %lx", (long)prev); |
446 | 429d0a3d | blueswir1 | p->ipf_prev = prev; |
447 | f0cbd3ec | bellard | p->ipf_next = prev->ipf_next; |
448 | 429d0a3d | blueswir1 | ((struct ipasfrag *)(prev->ipf_next))->ipf_prev = p;
|
449 | 429d0a3d | blueswir1 | prev->ipf_next = p; |
450 | f0cbd3ec | bellard | } |
451 | f0cbd3ec | bellard | |
452 | f0cbd3ec | bellard | /*
|
453 | f0cbd3ec | bellard | * To ip_enq as remque is to insque.
|
454 | f0cbd3ec | bellard | */
|
455 | 9634d903 | blueswir1 | static void |
456 | 9634d903 | blueswir1 | ip_deq(register struct ipasfrag *p) |
457 | f0cbd3ec | bellard | { |
458 | f0cbd3ec | bellard | ((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
|
459 | f0cbd3ec | bellard | ((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
|
460 | f0cbd3ec | bellard | } |
461 | f0cbd3ec | bellard | |
462 | f0cbd3ec | bellard | /*
|
463 | f0cbd3ec | bellard | * IP timer processing;
|
464 | f0cbd3ec | bellard | * if a timer expires on a reassembly
|
465 | f0cbd3ec | bellard | * queue, discard it.
|
466 | f0cbd3ec | bellard | */
|
467 | f0cbd3ec | bellard | void
|
468 | 511d2b14 | blueswir1 | ip_slowtimo(void)
|
469 | f0cbd3ec | bellard | { |
470 | 429d0a3d | blueswir1 | struct qlink *l;
|
471 | 5fafdf24 | ths | |
472 | f0cbd3ec | bellard | DEBUG_CALL("ip_slowtimo");
|
473 | 5fafdf24 | ths | |
474 | 429d0a3d | blueswir1 | l = ipq.ip_link.next; |
475 | 429d0a3d | blueswir1 | |
476 | 511d2b14 | blueswir1 | if (l == NULL) |
477 | f0cbd3ec | bellard | return;
|
478 | f0cbd3ec | bellard | |
479 | 429d0a3d | blueswir1 | while (l != &ipq.ip_link) {
|
480 | 429d0a3d | blueswir1 | struct ipq *fp = container_of(l, struct ipq, ip_link); |
481 | 429d0a3d | blueswir1 | l = l->next; |
482 | 429d0a3d | blueswir1 | if (--fp->ipq_ttl == 0) { |
483 | 31a60e22 | blueswir1 | STAT(ipstat.ips_fragtimeout++); |
484 | 429d0a3d | blueswir1 | ip_freef(fp); |
485 | f0cbd3ec | bellard | } |
486 | f0cbd3ec | bellard | } |
487 | f0cbd3ec | bellard | } |
488 | f0cbd3ec | bellard | |
489 | f0cbd3ec | bellard | /*
|
490 | f0cbd3ec | bellard | * Do option processing on a datagram,
|
491 | f0cbd3ec | bellard | * possibly discarding it if bad options are encountered,
|
492 | f0cbd3ec | bellard | * or forwarding it if source-routed.
|
493 | f0cbd3ec | bellard | * Returns 1 if packet has been forwarded/freed,
|
494 | f0cbd3ec | bellard | * 0 if the packet should be processed further.
|
495 | f0cbd3ec | bellard | */
|
496 | f0cbd3ec | bellard | |
497 | f0cbd3ec | bellard | #ifdef notdef
|
498 | f0cbd3ec | bellard | |
499 | f0cbd3ec | bellard | int
|
500 | f0cbd3ec | bellard | ip_dooptions(m) |
501 | f0cbd3ec | bellard | struct mbuf *m;
|
502 | f0cbd3ec | bellard | { |
503 | f0cbd3ec | bellard | register struct ip *ip = mtod(m, struct ip *); |
504 | f0cbd3ec | bellard | register u_char *cp;
|
505 | f0cbd3ec | bellard | register struct ip_timestamp *ipt; |
506 | f0cbd3ec | bellard | register struct in_ifaddr *ia; |
507 | f0cbd3ec | bellard | /* int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; */
|
508 | f0cbd3ec | bellard | int opt, optlen, cnt, off, code, type, forward = 0; |
509 | f0cbd3ec | bellard | struct in_addr *sin, dst;
|
510 | f0cbd3ec | bellard | typedef u_int32_t n_time;
|
511 | f0cbd3ec | bellard | n_time ntime; |
512 | f0cbd3ec | bellard | |
513 | f0cbd3ec | bellard | dst = ip->ip_dst; |
514 | f0cbd3ec | bellard | cp = (u_char *)(ip + 1);
|
515 | f0cbd3ec | bellard | cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
516 | f0cbd3ec | bellard | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
517 | f0cbd3ec | bellard | opt = cp[IPOPT_OPTVAL]; |
518 | f0cbd3ec | bellard | if (opt == IPOPT_EOL)
|
519 | f0cbd3ec | bellard | break;
|
520 | f0cbd3ec | bellard | if (opt == IPOPT_NOP)
|
521 | f0cbd3ec | bellard | optlen = 1;
|
522 | f0cbd3ec | bellard | else {
|
523 | f0cbd3ec | bellard | optlen = cp[IPOPT_OLEN]; |
524 | f0cbd3ec | bellard | if (optlen <= 0 || optlen > cnt) { |
525 | f0cbd3ec | bellard | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
526 | f0cbd3ec | bellard | goto bad;
|
527 | f0cbd3ec | bellard | } |
528 | f0cbd3ec | bellard | } |
529 | f0cbd3ec | bellard | switch (opt) {
|
530 | f0cbd3ec | bellard | |
531 | f0cbd3ec | bellard | default:
|
532 | f0cbd3ec | bellard | break;
|
533 | f0cbd3ec | bellard | |
534 | f0cbd3ec | bellard | /*
|
535 | f0cbd3ec | bellard | * Source routing with record.
|
536 | f0cbd3ec | bellard | * Find interface with current destination address.
|
537 | f0cbd3ec | bellard | * If none on this machine then drop if strictly routed,
|
538 | f0cbd3ec | bellard | * or do nothing if loosely routed.
|
539 | f0cbd3ec | bellard | * Record interface address and bring up next address
|
540 | f0cbd3ec | bellard | * component. If strictly routed make sure next
|
541 | f0cbd3ec | bellard | * address is on directly accessible net.
|
542 | f0cbd3ec | bellard | */
|
543 | f0cbd3ec | bellard | case IPOPT_LSRR:
|
544 | f0cbd3ec | bellard | case IPOPT_SSRR:
|
545 | f0cbd3ec | bellard | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
546 | f0cbd3ec | bellard | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
547 | f0cbd3ec | bellard | goto bad;
|
548 | f0cbd3ec | bellard | } |
549 | f0cbd3ec | bellard | ipaddr.sin_addr = ip->ip_dst; |
550 | f0cbd3ec | bellard | ia = (struct in_ifaddr *)
|
551 | f0cbd3ec | bellard | ifa_ifwithaddr((struct sockaddr *)&ipaddr);
|
552 | f0cbd3ec | bellard | if (ia == 0) { |
553 | f0cbd3ec | bellard | if (opt == IPOPT_SSRR) {
|
554 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
555 | f0cbd3ec | bellard | code = ICMP_UNREACH_SRCFAIL; |
556 | f0cbd3ec | bellard | goto bad;
|
557 | f0cbd3ec | bellard | } |
558 | f0cbd3ec | bellard | /*
|
559 | f0cbd3ec | bellard | * Loose routing, and not at next destination
|
560 | f0cbd3ec | bellard | * yet; nothing to do except forward.
|
561 | f0cbd3ec | bellard | */
|
562 | f0cbd3ec | bellard | break;
|
563 | f0cbd3ec | bellard | } |
564 | f0cbd3ec | bellard | off--; / * 0 origin * /
|
565 | f0cbd3ec | bellard | if (off > optlen - sizeof(struct in_addr)) { |
566 | f0cbd3ec | bellard | /*
|
567 | f0cbd3ec | bellard | * End of source route. Should be for us.
|
568 | f0cbd3ec | bellard | */
|
569 | f0cbd3ec | bellard | save_rte(cp, ip->ip_src); |
570 | f0cbd3ec | bellard | break;
|
571 | f0cbd3ec | bellard | } |
572 | f0cbd3ec | bellard | /*
|
573 | f0cbd3ec | bellard | * locate outgoing interface
|
574 | f0cbd3ec | bellard | */
|
575 | f0cbd3ec | bellard | bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, |
576 | f0cbd3ec | bellard | sizeof(ipaddr.sin_addr));
|
577 | f0cbd3ec | bellard | if (opt == IPOPT_SSRR) {
|
578 | f0cbd3ec | bellard | #define INA struct in_ifaddr * |
579 | f0cbd3ec | bellard | #define SA struct sockaddr * |
580 | f0cbd3ec | bellard | if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) |
581 | f0cbd3ec | bellard | ia = (INA)ifa_ifwithnet((SA)&ipaddr); |
582 | f0cbd3ec | bellard | } else
|
583 | f0cbd3ec | bellard | ia = ip_rtaddr(ipaddr.sin_addr); |
584 | f0cbd3ec | bellard | if (ia == 0) { |
585 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
586 | f0cbd3ec | bellard | code = ICMP_UNREACH_SRCFAIL; |
587 | f0cbd3ec | bellard | goto bad;
|
588 | f0cbd3ec | bellard | } |
589 | f0cbd3ec | bellard | ip->ip_dst = ipaddr.sin_addr; |
590 | f0cbd3ec | bellard | bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
591 | f0cbd3ec | bellard | (caddr_t)(cp + off), sizeof(struct in_addr)); |
592 | f0cbd3ec | bellard | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
593 | f0cbd3ec | bellard | /*
|
594 | f0cbd3ec | bellard | * Let ip_intr's mcast routing check handle mcast pkts
|
595 | f0cbd3ec | bellard | */
|
596 | f0cbd3ec | bellard | forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); |
597 | f0cbd3ec | bellard | break;
|
598 | f0cbd3ec | bellard | |
599 | f0cbd3ec | bellard | case IPOPT_RR:
|
600 | f0cbd3ec | bellard | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
601 | f0cbd3ec | bellard | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
602 | f0cbd3ec | bellard | goto bad;
|
603 | f0cbd3ec | bellard | } |
604 | f0cbd3ec | bellard | /*
|
605 | f0cbd3ec | bellard | * If no space remains, ignore.
|
606 | f0cbd3ec | bellard | */
|
607 | f0cbd3ec | bellard | off--; * 0 origin *
|
608 | f0cbd3ec | bellard | if (off > optlen - sizeof(struct in_addr)) |
609 | f0cbd3ec | bellard | break;
|
610 | f0cbd3ec | bellard | bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, |
611 | f0cbd3ec | bellard | sizeof(ipaddr.sin_addr));
|
612 | f0cbd3ec | bellard | /*
|
613 | f0cbd3ec | bellard | * locate outgoing interface; if we're the destination,
|
614 | f0cbd3ec | bellard | * use the incoming interface (should be same).
|
615 | f0cbd3ec | bellard | */
|
616 | f0cbd3ec | bellard | if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && |
617 | f0cbd3ec | bellard | (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
|
618 | f0cbd3ec | bellard | type = ICMP_UNREACH; |
619 | f0cbd3ec | bellard | code = ICMP_UNREACH_HOST; |
620 | f0cbd3ec | bellard | goto bad;
|
621 | f0cbd3ec | bellard | } |
622 | f0cbd3ec | bellard | bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
623 | f0cbd3ec | bellard | (caddr_t)(cp + off), sizeof(struct in_addr)); |
624 | f0cbd3ec | bellard | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
625 | f0cbd3ec | bellard | break;
|
626 | f0cbd3ec | bellard | |
627 | f0cbd3ec | bellard | case IPOPT_TS:
|
628 | f0cbd3ec | bellard | code = cp - (u_char *)ip; |
629 | f0cbd3ec | bellard | ipt = (struct ip_timestamp *)cp;
|
630 | f0cbd3ec | bellard | if (ipt->ipt_len < 5) |
631 | f0cbd3ec | bellard | goto bad;
|
632 | f0cbd3ec | bellard | if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { |
633 | f0cbd3ec | bellard | if (++ipt->ipt_oflw == 0) |
634 | f0cbd3ec | bellard | goto bad;
|
635 | f0cbd3ec | bellard | break;
|
636 | f0cbd3ec | bellard | } |
637 | f0cbd3ec | bellard | sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); |
638 | f0cbd3ec | bellard | switch (ipt->ipt_flg) {
|
639 | f0cbd3ec | bellard | |
640 | f0cbd3ec | bellard | case IPOPT_TS_TSONLY:
|
641 | f0cbd3ec | bellard | break;
|
642 | f0cbd3ec | bellard | |
643 | f0cbd3ec | bellard | case IPOPT_TS_TSANDADDR:
|
644 | f0cbd3ec | bellard | if (ipt->ipt_ptr + sizeof(n_time) + |
645 | f0cbd3ec | bellard | sizeof(struct in_addr) > ipt->ipt_len) |
646 | f0cbd3ec | bellard | goto bad;
|
647 | f0cbd3ec | bellard | ipaddr.sin_addr = dst; |
648 | f0cbd3ec | bellard | ia = (INA)ifaof_ i f p foraddr((SA)&ipaddr, |
649 | f0cbd3ec | bellard | m->m_pkthdr.rcvif); |
650 | f0cbd3ec | bellard | if (ia == 0) |
651 | f0cbd3ec | bellard | continue;
|
652 | f0cbd3ec | bellard | bcopy((caddr_t)&IA_SIN(ia)->sin_addr, |
653 | f0cbd3ec | bellard | (caddr_t)sin, sizeof(struct in_addr)); |
654 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(struct in_addr); |
655 | f0cbd3ec | bellard | break;
|
656 | f0cbd3ec | bellard | |
657 | f0cbd3ec | bellard | case IPOPT_TS_PRESPEC:
|
658 | f0cbd3ec | bellard | if (ipt->ipt_ptr + sizeof(n_time) + |
659 | f0cbd3ec | bellard | sizeof(struct in_addr) > ipt->ipt_len) |
660 | f0cbd3ec | bellard | goto bad;
|
661 | f0cbd3ec | bellard | bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr, |
662 | f0cbd3ec | bellard | sizeof(struct in_addr)); |
663 | f0cbd3ec | bellard | if (ifa_ifwithaddr((SA)&ipaddr) == 0) |
664 | f0cbd3ec | bellard | continue;
|
665 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(struct in_addr); |
666 | f0cbd3ec | bellard | break;
|
667 | f0cbd3ec | bellard | |
668 | f0cbd3ec | bellard | default:
|
669 | f0cbd3ec | bellard | goto bad;
|
670 | f0cbd3ec | bellard | } |
671 | f0cbd3ec | bellard | ntime = iptime(); |
672 | f0cbd3ec | bellard | bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
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673 | f0cbd3ec | bellard | sizeof(n_time));
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674 | f0cbd3ec | bellard | ipt->ipt_ptr += sizeof(n_time);
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675 | f0cbd3ec | bellard | } |
676 | f0cbd3ec | bellard | } |
677 | f0cbd3ec | bellard | if (forward) {
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678 | f0cbd3ec | bellard | ip_forward(m, 1);
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679 | f0cbd3ec | bellard | return (1); |
680 | f0cbd3ec | bellard | } |
681 | f0cbd3ec | bellard | } |
682 | f0cbd3ec | bellard | } |
683 | f0cbd3ec | bellard | return (0); |
684 | f0cbd3ec | bellard | bad:
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685 | f0cbd3ec | bellard | /* ip->ip_len -= ip->ip_hl << 2; XXX icmp_error adds in hdr length */
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686 | f0cbd3ec | bellard | |
687 | f0cbd3ec | bellard | /* Not yet */
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688 | f0cbd3ec | bellard | icmp_error(m, type, code, 0, 0); |
689 | f0cbd3ec | bellard | |
690 | 31a60e22 | blueswir1 | STAT(ipstat.ips_badoptions++); |
691 | f0cbd3ec | bellard | return (1); |
692 | f0cbd3ec | bellard | } |
693 | f0cbd3ec | bellard | |
694 | f0cbd3ec | bellard | #endif /* notdef */ |
695 | f0cbd3ec | bellard | |
696 | f0cbd3ec | bellard | /*
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697 | f0cbd3ec | bellard | * Strip out IP options, at higher
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698 | f0cbd3ec | bellard | * level protocol in the kernel.
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699 | f0cbd3ec | bellard | * Second argument is buffer to which options
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700 | f0cbd3ec | bellard | * will be moved, and return value is their length.
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701 | f0cbd3ec | bellard | * (XXX) should be deleted; last arg currently ignored.
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702 | f0cbd3ec | bellard | */
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703 | f0cbd3ec | bellard | void
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704 | 511d2b14 | blueswir1 | ip_stripoptions(register struct mbuf *m, struct mbuf *mopt) |
705 | f0cbd3ec | bellard | { |
706 | f0cbd3ec | bellard | register int i; |
707 | f0cbd3ec | bellard | struct ip *ip = mtod(m, struct ip *); |
708 | f0cbd3ec | bellard | register caddr_t opts;
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709 | f0cbd3ec | bellard | int olen;
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710 | f0cbd3ec | bellard | |
711 | f0cbd3ec | bellard | olen = (ip->ip_hl<<2) - sizeof (struct ip); |
712 | f0cbd3ec | bellard | opts = (caddr_t)(ip + 1);
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713 | f0cbd3ec | bellard | i = m->m_len - (sizeof (struct ip) + olen); |
714 | f0cbd3ec | bellard | memcpy(opts, opts + olen, (unsigned)i);
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715 | f0cbd3ec | bellard | m->m_len -= olen; |
716 | 5fafdf24 | ths | |
717 | f0cbd3ec | bellard | ip->ip_hl = sizeof(struct ip) >> 2; |
718 | f0cbd3ec | bellard | } |