root / slirp / ip_icmp.c @ 14015304
History | View | Annotate | Download (12 kB)
1 | f0cbd3ec | bellard | /*
|
---|---|---|---|
2 | f0cbd3ec | bellard | * Copyright (c) 1982, 1986, 1988, 1993
|
3 | f0cbd3ec | bellard | * The Regents of the University of California. All rights reserved.
|
4 | f0cbd3ec | bellard | *
|
5 | f0cbd3ec | bellard | * Redistribution and use in source and binary forms, with or without
|
6 | f0cbd3ec | bellard | * modification, are permitted provided that the following conditions
|
7 | f0cbd3ec | bellard | * are met:
|
8 | f0cbd3ec | bellard | * 1. Redistributions of source code must retain the above copyright
|
9 | f0cbd3ec | bellard | * notice, this list of conditions and the following disclaimer.
|
10 | f0cbd3ec | bellard | * 2. Redistributions in binary form must reproduce the above copyright
|
11 | f0cbd3ec | bellard | * notice, this list of conditions and the following disclaimer in the
|
12 | f0cbd3ec | bellard | * documentation and/or other materials provided with the distribution.
|
13 | 2f5f8996 | aliguori | * 3. Neither the name of the University nor the names of its contributors
|
14 | f0cbd3ec | bellard | * may be used to endorse or promote products derived from this software
|
15 | f0cbd3ec | bellard | * without specific prior written permission.
|
16 | f0cbd3ec | bellard | *
|
17 | f0cbd3ec | bellard | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
18 | f0cbd3ec | bellard | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
19 | f0cbd3ec | bellard | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
20 | f0cbd3ec | bellard | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
21 | f0cbd3ec | bellard | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
22 | f0cbd3ec | bellard | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
23 | f0cbd3ec | bellard | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
24 | f0cbd3ec | bellard | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
25 | f0cbd3ec | bellard | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
26 | f0cbd3ec | bellard | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
27 | f0cbd3ec | bellard | * SUCH DAMAGE.
|
28 | f0cbd3ec | bellard | *
|
29 | f0cbd3ec | bellard | * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
|
30 | f0cbd3ec | bellard | * ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp
|
31 | f0cbd3ec | bellard | */
|
32 | f0cbd3ec | bellard | |
33 | f0cbd3ec | bellard | #include "slirp.h" |
34 | f0cbd3ec | bellard | #include "ip_icmp.h" |
35 | f0cbd3ec | bellard | |
36 | f0cbd3ec | bellard | /* The message sent when emulating PING */
|
37 | 7878ff6b | blueswir1 | /* Be nice and tell them it's just a pseudo-ping packet */
|
38 | 7ca699c8 | blueswir1 | static const char icmp_ping_msg[] = "This is a pseudo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n"; |
39 | f0cbd3ec | bellard | |
40 | f0cbd3ec | bellard | /* list of actions for icmp_error() on RX of an icmp message */
|
41 | 9634d903 | blueswir1 | static const int icmp_flush[19] = { |
42 | f0cbd3ec | bellard | /* ECHO REPLY (0) */ 0, |
43 | f0cbd3ec | bellard | 1,
|
44 | f0cbd3ec | bellard | 1,
|
45 | f0cbd3ec | bellard | /* DEST UNREACH (3) */ 1, |
46 | f0cbd3ec | bellard | /* SOURCE QUENCH (4)*/ 1, |
47 | f0cbd3ec | bellard | /* REDIRECT (5) */ 1, |
48 | f0cbd3ec | bellard | 1,
|
49 | f0cbd3ec | bellard | 1,
|
50 | f0cbd3ec | bellard | /* ECHO (8) */ 0, |
51 | f0cbd3ec | bellard | /* ROUTERADVERT (9) */ 1, |
52 | f0cbd3ec | bellard | /* ROUTERSOLICIT (10) */ 1, |
53 | f0cbd3ec | bellard | /* TIME EXCEEDED (11) */ 1, |
54 | f0cbd3ec | bellard | /* PARAMETER PROBLEM (12) */ 1, |
55 | f0cbd3ec | bellard | /* TIMESTAMP (13) */ 0, |
56 | f0cbd3ec | bellard | /* TIMESTAMP REPLY (14) */ 0, |
57 | f0cbd3ec | bellard | /* INFO (15) */ 0, |
58 | f0cbd3ec | bellard | /* INFO REPLY (16) */ 0, |
59 | f0cbd3ec | bellard | /* ADDR MASK (17) */ 0, |
60 | 5fafdf24 | ths | /* ADDR MASK REPLY (18) */ 0 |
61 | f0cbd3ec | bellard | }; |
62 | f0cbd3ec | bellard | |
63 | e6d43cfb | Jan Kiszka | void icmp_init(Slirp *slirp)
|
64 | e6d43cfb | Jan Kiszka | { |
65 | e6d43cfb | Jan Kiszka | slirp->icmp.so_next = slirp->icmp.so_prev = &slirp->icmp; |
66 | e6d43cfb | Jan Kiszka | slirp->icmp_last_so = &slirp->icmp; |
67 | e6d43cfb | Jan Kiszka | } |
68 | e6d43cfb | Jan Kiszka | |
69 | e6d43cfb | Jan Kiszka | static int icmp_send(struct socket *so, struct mbuf *m, int hlen) |
70 | e6d43cfb | Jan Kiszka | { |
71 | e6d43cfb | Jan Kiszka | struct ip *ip = mtod(m, struct ip *); |
72 | e6d43cfb | Jan Kiszka | struct sockaddr_in addr;
|
73 | e6d43cfb | Jan Kiszka | |
74 | e6d43cfb | Jan Kiszka | so->s = qemu_socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP); |
75 | e6d43cfb | Jan Kiszka | if (so->s == -1) { |
76 | e6d43cfb | Jan Kiszka | return -1; |
77 | e6d43cfb | Jan Kiszka | } |
78 | e6d43cfb | Jan Kiszka | |
79 | e6d43cfb | Jan Kiszka | so->so_m = m; |
80 | e6d43cfb | Jan Kiszka | so->so_faddr = ip->ip_dst; |
81 | e6d43cfb | Jan Kiszka | so->so_laddr = ip->ip_src; |
82 | e6d43cfb | Jan Kiszka | so->so_iptos = ip->ip_tos; |
83 | e6d43cfb | Jan Kiszka | so->so_type = IPPROTO_ICMP; |
84 | e6d43cfb | Jan Kiszka | so->so_state = SS_ISFCONNECTED; |
85 | e6d43cfb | Jan Kiszka | so->so_expire = curtime + SO_EXPIRE; |
86 | e6d43cfb | Jan Kiszka | |
87 | e6d43cfb | Jan Kiszka | addr.sin_family = AF_INET; |
88 | e6d43cfb | Jan Kiszka | addr.sin_addr = so->so_faddr; |
89 | e6d43cfb | Jan Kiszka | |
90 | e6d43cfb | Jan Kiszka | insque(so, &so->slirp->icmp); |
91 | e6d43cfb | Jan Kiszka | |
92 | e6d43cfb | Jan Kiszka | if (sendto(so->s, m->m_data + hlen, m->m_len - hlen, 0, |
93 | e6d43cfb | Jan Kiszka | (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
94 | e6d43cfb | Jan Kiszka | DEBUG_MISC((dfd, "icmp_input icmp sendto tx errno = %d-%s\n",
|
95 | e6d43cfb | Jan Kiszka | errno, strerror(errno))); |
96 | e6d43cfb | Jan Kiszka | icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
|
97 | e6d43cfb | Jan Kiszka | icmp_detach(so); |
98 | e6d43cfb | Jan Kiszka | } |
99 | e6d43cfb | Jan Kiszka | |
100 | e6d43cfb | Jan Kiszka | return 0; |
101 | e6d43cfb | Jan Kiszka | } |
102 | e6d43cfb | Jan Kiszka | |
103 | e6d43cfb | Jan Kiszka | void icmp_detach(struct socket *so) |
104 | e6d43cfb | Jan Kiszka | { |
105 | e6d43cfb | Jan Kiszka | closesocket(so->s); |
106 | e6d43cfb | Jan Kiszka | sofree(so); |
107 | e6d43cfb | Jan Kiszka | } |
108 | e6d43cfb | Jan Kiszka | |
109 | f0cbd3ec | bellard | /*
|
110 | f0cbd3ec | bellard | * Process a received ICMP message.
|
111 | f0cbd3ec | bellard | */
|
112 | f0cbd3ec | bellard | void
|
113 | 511d2b14 | blueswir1 | icmp_input(struct mbuf *m, int hlen) |
114 | f0cbd3ec | bellard | { |
115 | f0cbd3ec | bellard | register struct icmp *icp; |
116 | f0cbd3ec | bellard | register struct ip *ip=mtod(m, struct ip *); |
117 | f0cbd3ec | bellard | int icmplen=ip->ip_len;
|
118 | 460fec67 | Jan Kiszka | Slirp *slirp = m->slirp; |
119 | 5fafdf24 | ths | |
120 | f0cbd3ec | bellard | DEBUG_CALL("icmp_input");
|
121 | f0cbd3ec | bellard | DEBUG_ARG("m = %lx", (long )m); |
122 | f0cbd3ec | bellard | DEBUG_ARG("m_len = %d", m->m_len);
|
123 | f0cbd3ec | bellard | |
124 | f0cbd3ec | bellard | /*
|
125 | f0cbd3ec | bellard | * Locate icmp structure in mbuf, and check
|
126 | f0cbd3ec | bellard | * that its not corrupted and of at least minimum length.
|
127 | f0cbd3ec | bellard | */
|
128 | f0cbd3ec | bellard | if (icmplen < ICMP_MINLEN) { /* min 8 bytes payload */ |
129 | f0cbd3ec | bellard | freeit:
|
130 | 3acccfc6 | Jan Kiszka | m_free(m); |
131 | f0cbd3ec | bellard | goto end_error;
|
132 | f0cbd3ec | bellard | } |
133 | f0cbd3ec | bellard | |
134 | f0cbd3ec | bellard | m->m_len -= hlen; |
135 | f0cbd3ec | bellard | m->m_data += hlen; |
136 | f0cbd3ec | bellard | icp = mtod(m, struct icmp *);
|
137 | f0cbd3ec | bellard | if (cksum(m, icmplen)) {
|
138 | f0cbd3ec | bellard | goto freeit;
|
139 | f0cbd3ec | bellard | } |
140 | f0cbd3ec | bellard | m->m_len += hlen; |
141 | f0cbd3ec | bellard | m->m_data -= hlen; |
142 | 3b46e624 | ths | |
143 | f0cbd3ec | bellard | DEBUG_ARG("icmp_type = %d", icp->icmp_type);
|
144 | f0cbd3ec | bellard | switch (icp->icmp_type) {
|
145 | f0cbd3ec | bellard | case ICMP_ECHO:
|
146 | f0cbd3ec | bellard | ip->ip_len += hlen; /* since ip_input subtracts this */
|
147 | 460fec67 | Jan Kiszka | if (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr) {
|
148 | f0cbd3ec | bellard | icmp_reflect(m); |
149 | 12b513d8 | Jan Kiszka | } else if (slirp->restricted) { |
150 | 12b513d8 | Jan Kiszka | goto freeit;
|
151 | f0cbd3ec | bellard | } else {
|
152 | f0cbd3ec | bellard | struct socket *so;
|
153 | f0cbd3ec | bellard | struct sockaddr_in addr;
|
154 | 460fec67 | Jan Kiszka | if ((so = socreate(slirp)) == NULL) goto freeit; |
155 | e6d43cfb | Jan Kiszka | if (icmp_send(so, m, hlen) == 0) { |
156 | e6d43cfb | Jan Kiszka | return;
|
157 | e6d43cfb | Jan Kiszka | } |
158 | f0cbd3ec | bellard | if(udp_attach(so) == -1) { |
159 | 5fafdf24 | ths | DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
|
160 | f0cbd3ec | bellard | errno,strerror(errno))); |
161 | f0cbd3ec | bellard | sofree(so); |
162 | f0cbd3ec | bellard | m_free(m); |
163 | f0cbd3ec | bellard | goto end_error;
|
164 | f0cbd3ec | bellard | } |
165 | f0cbd3ec | bellard | so->so_m = m; |
166 | f0cbd3ec | bellard | so->so_faddr = ip->ip_dst; |
167 | f0cbd3ec | bellard | so->so_fport = htons(7);
|
168 | f0cbd3ec | bellard | so->so_laddr = ip->ip_src; |
169 | f0cbd3ec | bellard | so->so_lport = htons(9);
|
170 | f0cbd3ec | bellard | so->so_iptos = ip->ip_tos; |
171 | f0cbd3ec | bellard | so->so_type = IPPROTO_ICMP; |
172 | f0cbd3ec | bellard | so->so_state = SS_ISFCONNECTED; |
173 | 3b46e624 | ths | |
174 | f0cbd3ec | bellard | /* Send the packet */
|
175 | f0cbd3ec | bellard | addr.sin_family = AF_INET; |
176 | 460fec67 | Jan Kiszka | if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
|
177 | 460fec67 | Jan Kiszka | slirp->vnetwork_addr.s_addr) { |
178 | f0cbd3ec | bellard | /* It's an alias */
|
179 | 460fec67 | Jan Kiszka | if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
|
180 | df7a86ed | Ed Swierk | if (get_dns_addr(&addr.sin_addr) < 0) |
181 | df7a86ed | Ed Swierk | addr.sin_addr = loopback_addr; |
182 | a13a4126 | Jan Kiszka | } else {
|
183 | f0cbd3ec | bellard | addr.sin_addr = loopback_addr; |
184 | f0cbd3ec | bellard | } |
185 | f0cbd3ec | bellard | } else {
|
186 | f0cbd3ec | bellard | addr.sin_addr = so->so_faddr; |
187 | f0cbd3ec | bellard | } |
188 | f0cbd3ec | bellard | addr.sin_port = so->so_fport; |
189 | f0cbd3ec | bellard | if(sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0, |
190 | f0cbd3ec | bellard | (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
191 | f0cbd3ec | bellard | DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
|
192 | f0cbd3ec | bellard | errno,strerror(errno))); |
193 | 5fafdf24 | ths | icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
|
194 | f0cbd3ec | bellard | udp_detach(so); |
195 | f0cbd3ec | bellard | } |
196 | 8dbca8dd | bellard | } /* if ip->ip_dst.s_addr == alias_addr.s_addr */
|
197 | f0cbd3ec | bellard | break;
|
198 | f0cbd3ec | bellard | case ICMP_UNREACH:
|
199 | f0cbd3ec | bellard | /* XXX? report error? close socket? */
|
200 | f0cbd3ec | bellard | case ICMP_TIMXCEED:
|
201 | f0cbd3ec | bellard | case ICMP_PARAMPROB:
|
202 | f0cbd3ec | bellard | case ICMP_SOURCEQUENCH:
|
203 | f0cbd3ec | bellard | case ICMP_TSTAMP:
|
204 | f0cbd3ec | bellard | case ICMP_MASKREQ:
|
205 | f0cbd3ec | bellard | case ICMP_REDIRECT:
|
206 | 3acccfc6 | Jan Kiszka | m_free(m); |
207 | f0cbd3ec | bellard | break;
|
208 | 3b46e624 | ths | |
209 | f0cbd3ec | bellard | default:
|
210 | 3acccfc6 | Jan Kiszka | m_free(m); |
211 | f0cbd3ec | bellard | } /* swith */
|
212 | f0cbd3ec | bellard | |
213 | f0cbd3ec | bellard | end_error:
|
214 | f0cbd3ec | bellard | /* m is m_free()'d xor put in a socket xor or given to ip_send */
|
215 | f0cbd3ec | bellard | return;
|
216 | f0cbd3ec | bellard | } |
217 | f0cbd3ec | bellard | |
218 | f0cbd3ec | bellard | |
219 | f0cbd3ec | bellard | /*
|
220 | f0cbd3ec | bellard | * Send an ICMP message in response to a situation
|
221 | f0cbd3ec | bellard | *
|
222 | f0cbd3ec | bellard | * RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
|
223 | f0cbd3ec | bellard | * MUST NOT change this header information.
|
224 | f0cbd3ec | bellard | * MUST NOT reply to a multicast/broadcast IP address.
|
225 | f0cbd3ec | bellard | * MUST NOT reply to a multicast/broadcast MAC address.
|
226 | f0cbd3ec | bellard | * MUST reply to only the first fragment.
|
227 | f0cbd3ec | bellard | */
|
228 | f0cbd3ec | bellard | /*
|
229 | f0cbd3ec | bellard | * Send ICMP_UNREACH back to the source regarding msrc.
|
230 | f0cbd3ec | bellard | * mbuf *msrc is used as a template, but is NOT m_free()'d.
|
231 | f0cbd3ec | bellard | * It is reported as the bad ip packet. The header should
|
232 | f0cbd3ec | bellard | * be fully correct and in host byte order.
|
233 | 5fafdf24 | ths | * ICMP fragmentation is illegal. All machines must accept 576 bytes in one
|
234 | f0cbd3ec | bellard | * packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
|
235 | f0cbd3ec | bellard | */
|
236 | f0cbd3ec | bellard | |
237 | f0cbd3ec | bellard | #define ICMP_MAXDATALEN (IP_MSS-28) |
238 | f0cbd3ec | bellard | void
|
239 | 7ccfb2eb | blueswir1 | icmp_error(struct mbuf *msrc, u_char type, u_char code, int minsize, |
240 | 7ccfb2eb | blueswir1 | const char *message) |
241 | f0cbd3ec | bellard | { |
242 | f0cbd3ec | bellard | unsigned hlen, shlen, s_ip_len;
|
243 | f0cbd3ec | bellard | register struct ip *ip; |
244 | f0cbd3ec | bellard | register struct icmp *icp; |
245 | f0cbd3ec | bellard | register struct mbuf *m; |
246 | f0cbd3ec | bellard | |
247 | f0cbd3ec | bellard | DEBUG_CALL("icmp_error");
|
248 | f0cbd3ec | bellard | DEBUG_ARG("msrc = %lx", (long )msrc); |
249 | f0cbd3ec | bellard | DEBUG_ARG("msrc_len = %d", msrc->m_len);
|
250 | f0cbd3ec | bellard | |
251 | f0cbd3ec | bellard | if(type!=ICMP_UNREACH && type!=ICMP_TIMXCEED) goto end_error; |
252 | f0cbd3ec | bellard | |
253 | f0cbd3ec | bellard | /* check msrc */
|
254 | f0cbd3ec | bellard | if(!msrc) goto end_error; |
255 | f0cbd3ec | bellard | ip = mtod(msrc, struct ip *);
|
256 | eb38c52c | blueswir1 | #ifdef DEBUG
|
257 | f0cbd3ec | bellard | { char bufa[20], bufb[20]; |
258 | f0cbd3ec | bellard | strcpy(bufa, inet_ntoa(ip->ip_src)); |
259 | f0cbd3ec | bellard | strcpy(bufb, inet_ntoa(ip->ip_dst)); |
260 | f0cbd3ec | bellard | DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
|
261 | f0cbd3ec | bellard | } |
262 | f0cbd3ec | bellard | #endif
|
263 | f0cbd3ec | bellard | if(ip->ip_off & IP_OFFMASK) goto end_error; /* Only reply to fragment 0 */ |
264 | f0cbd3ec | bellard | |
265 | f0cbd3ec | bellard | shlen=ip->ip_hl << 2;
|
266 | f0cbd3ec | bellard | s_ip_len=ip->ip_len; |
267 | f0cbd3ec | bellard | if(ip->ip_p == IPPROTO_ICMP) {
|
268 | f0cbd3ec | bellard | icp = (struct icmp *)((char *)ip + shlen); |
269 | f0cbd3ec | bellard | /*
|
270 | f0cbd3ec | bellard | * Assume any unknown ICMP type is an error. This isn't
|
271 | f0cbd3ec | bellard | * specified by the RFC, but think about it..
|
272 | f0cbd3ec | bellard | */
|
273 | f0cbd3ec | bellard | if(icp->icmp_type>18 || icmp_flush[icp->icmp_type]) goto end_error; |
274 | f0cbd3ec | bellard | } |
275 | f0cbd3ec | bellard | |
276 | f0cbd3ec | bellard | /* make a copy */
|
277 | 460fec67 | Jan Kiszka | m = m_get(msrc->slirp); |
278 | 460fec67 | Jan Kiszka | if (!m) {
|
279 | 460fec67 | Jan Kiszka | goto end_error;
|
280 | 460fec67 | Jan Kiszka | } |
281 | 460fec67 | Jan Kiszka | |
282 | f0cbd3ec | bellard | { int new_m_size;
|
283 | f0cbd3ec | bellard | new_m_size=sizeof(struct ip )+ICMP_MINLEN+msrc->m_len+ICMP_MAXDATALEN; |
284 | f0cbd3ec | bellard | if(new_m_size>m->m_size) m_inc(m, new_m_size);
|
285 | f0cbd3ec | bellard | } |
286 | f0cbd3ec | bellard | memcpy(m->m_data, msrc->m_data, msrc->m_len); |
287 | f0cbd3ec | bellard | m->m_len = msrc->m_len; /* copy msrc to m */
|
288 | f0cbd3ec | bellard | |
289 | f0cbd3ec | bellard | /* make the header of the reply packet */
|
290 | f0cbd3ec | bellard | ip = mtod(m, struct ip *);
|
291 | f0cbd3ec | bellard | hlen= sizeof(struct ip ); /* no options in reply */ |
292 | 3b46e624 | ths | |
293 | f0cbd3ec | bellard | /* fill in icmp */
|
294 | 3b46e624 | ths | m->m_data += hlen; |
295 | f0cbd3ec | bellard | m->m_len -= hlen; |
296 | f0cbd3ec | bellard | |
297 | f0cbd3ec | bellard | icp = mtod(m, struct icmp *);
|
298 | f0cbd3ec | bellard | |
299 | f0cbd3ec | bellard | if(minsize) s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */ |
300 | f0cbd3ec | bellard | else if(s_ip_len>ICMP_MAXDATALEN) /* maximum size */ |
301 | f0cbd3ec | bellard | s_ip_len=ICMP_MAXDATALEN; |
302 | f0cbd3ec | bellard | |
303 | 3b46e624 | ths | m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */
|
304 | f0cbd3ec | bellard | |
305 | f0cbd3ec | bellard | /* min. size = 8+sizeof(struct ip)+8 */
|
306 | f0cbd3ec | bellard | |
307 | f0cbd3ec | bellard | icp->icmp_type = type; |
308 | f0cbd3ec | bellard | icp->icmp_code = code; |
309 | f0cbd3ec | bellard | icp->icmp_id = 0;
|
310 | f0cbd3ec | bellard | icp->icmp_seq = 0;
|
311 | f0cbd3ec | bellard | |
312 | f0cbd3ec | bellard | memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
|
313 | f0cbd3ec | bellard | HTONS(icp->icmp_ip.ip_len); |
314 | f0cbd3ec | bellard | HTONS(icp->icmp_ip.ip_id); |
315 | f0cbd3ec | bellard | HTONS(icp->icmp_ip.ip_off); |
316 | f0cbd3ec | bellard | |
317 | eb38c52c | blueswir1 | #ifdef DEBUG
|
318 | f0cbd3ec | bellard | if(message) { /* DEBUG : append message to ICMP packet */ |
319 | f0cbd3ec | bellard | int message_len;
|
320 | f0cbd3ec | bellard | char *cpnt;
|
321 | f0cbd3ec | bellard | message_len=strlen(message); |
322 | f0cbd3ec | bellard | if(message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
|
323 | f0cbd3ec | bellard | cpnt=(char *)m->m_data+m->m_len;
|
324 | f0cbd3ec | bellard | memcpy(cpnt, message, message_len); |
325 | f0cbd3ec | bellard | m->m_len+=message_len; |
326 | f0cbd3ec | bellard | } |
327 | f0cbd3ec | bellard | #endif
|
328 | f0cbd3ec | bellard | |
329 | f0cbd3ec | bellard | icp->icmp_cksum = 0;
|
330 | f0cbd3ec | bellard | icp->icmp_cksum = cksum(m, m->m_len); |
331 | f0cbd3ec | bellard | |
332 | f0cbd3ec | bellard | m->m_data -= hlen; |
333 | f0cbd3ec | bellard | m->m_len += hlen; |
334 | f0cbd3ec | bellard | |
335 | f0cbd3ec | bellard | /* fill in ip */
|
336 | f0cbd3ec | bellard | ip->ip_hl = hlen >> 2;
|
337 | f0cbd3ec | bellard | ip->ip_len = m->m_len; |
338 | 3b46e624 | ths | |
339 | f0cbd3ec | bellard | ip->ip_tos=((ip->ip_tos & 0x1E) | 0xC0); /* high priority for errors */ |
340 | f0cbd3ec | bellard | |
341 | f0cbd3ec | bellard | ip->ip_ttl = MAXTTL; |
342 | f0cbd3ec | bellard | ip->ip_p = IPPROTO_ICMP; |
343 | f0cbd3ec | bellard | ip->ip_dst = ip->ip_src; /* ip adresses */
|
344 | 460fec67 | Jan Kiszka | ip->ip_src = m->slirp->vhost_addr; |
345 | f0cbd3ec | bellard | |
346 | f0cbd3ec | bellard | (void ) ip_output((struct socket *)NULL, m); |
347 | 3b46e624 | ths | |
348 | f0cbd3ec | bellard | end_error:
|
349 | f0cbd3ec | bellard | return;
|
350 | f0cbd3ec | bellard | } |
351 | f0cbd3ec | bellard | #undef ICMP_MAXDATALEN
|
352 | f0cbd3ec | bellard | |
353 | f0cbd3ec | bellard | /*
|
354 | f0cbd3ec | bellard | * Reflect the ip packet back to the source
|
355 | f0cbd3ec | bellard | */
|
356 | f0cbd3ec | bellard | void
|
357 | 511d2b14 | blueswir1 | icmp_reflect(struct mbuf *m)
|
358 | f0cbd3ec | bellard | { |
359 | f0cbd3ec | bellard | register struct ip *ip = mtod(m, struct ip *); |
360 | f0cbd3ec | bellard | int hlen = ip->ip_hl << 2; |
361 | f0cbd3ec | bellard | int optlen = hlen - sizeof(struct ip ); |
362 | f0cbd3ec | bellard | register struct icmp *icp; |
363 | f0cbd3ec | bellard | |
364 | f0cbd3ec | bellard | /*
|
365 | f0cbd3ec | bellard | * Send an icmp packet back to the ip level,
|
366 | f0cbd3ec | bellard | * after supplying a checksum.
|
367 | f0cbd3ec | bellard | */
|
368 | f0cbd3ec | bellard | m->m_data += hlen; |
369 | f0cbd3ec | bellard | m->m_len -= hlen; |
370 | f0cbd3ec | bellard | icp = mtod(m, struct icmp *);
|
371 | f0cbd3ec | bellard | |
372 | e6d43cfb | Jan Kiszka | icp->icmp_type = ICMP_ECHOREPLY; |
373 | f0cbd3ec | bellard | icp->icmp_cksum = 0;
|
374 | f0cbd3ec | bellard | icp->icmp_cksum = cksum(m, ip->ip_len - hlen); |
375 | f0cbd3ec | bellard | |
376 | f0cbd3ec | bellard | m->m_data -= hlen; |
377 | f0cbd3ec | bellard | m->m_len += hlen; |
378 | f0cbd3ec | bellard | |
379 | f0cbd3ec | bellard | /* fill in ip */
|
380 | f0cbd3ec | bellard | if (optlen > 0) { |
381 | f0cbd3ec | bellard | /*
|
382 | f0cbd3ec | bellard | * Strip out original options by copying rest of first
|
383 | f0cbd3ec | bellard | * mbuf's data back, and adjust the IP length.
|
384 | f0cbd3ec | bellard | */
|
385 | f0cbd3ec | bellard | memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
|
386 | f0cbd3ec | bellard | (unsigned )(m->m_len - hlen));
|
387 | f0cbd3ec | bellard | hlen -= optlen; |
388 | f0cbd3ec | bellard | ip->ip_hl = hlen >> 2;
|
389 | f0cbd3ec | bellard | ip->ip_len -= optlen; |
390 | f0cbd3ec | bellard | m->m_len -= optlen; |
391 | f0cbd3ec | bellard | } |
392 | f0cbd3ec | bellard | |
393 | f0cbd3ec | bellard | ip->ip_ttl = MAXTTL; |
394 | f0cbd3ec | bellard | { /* swap */
|
395 | f0cbd3ec | bellard | struct in_addr icmp_dst;
|
396 | f0cbd3ec | bellard | icmp_dst = ip->ip_dst; |
397 | f0cbd3ec | bellard | ip->ip_dst = ip->ip_src; |
398 | f0cbd3ec | bellard | ip->ip_src = icmp_dst; |
399 | f0cbd3ec | bellard | } |
400 | f0cbd3ec | bellard | |
401 | f0cbd3ec | bellard | (void ) ip_output((struct socket *)NULL, m); |
402 | f0cbd3ec | bellard | } |
403 | e6d43cfb | Jan Kiszka | |
404 | e6d43cfb | Jan Kiszka | void icmp_receive(struct socket *so) |
405 | e6d43cfb | Jan Kiszka | { |
406 | e6d43cfb | Jan Kiszka | struct mbuf *m = so->so_m;
|
407 | e6d43cfb | Jan Kiszka | struct ip *ip = mtod(m, struct ip *); |
408 | e6d43cfb | Jan Kiszka | int hlen = ip->ip_hl << 2; |
409 | e6d43cfb | Jan Kiszka | u_char error_code; |
410 | e6d43cfb | Jan Kiszka | struct icmp *icp;
|
411 | e6d43cfb | Jan Kiszka | int id, len;
|
412 | e6d43cfb | Jan Kiszka | |
413 | e6d43cfb | Jan Kiszka | m->m_data += hlen; |
414 | e6d43cfb | Jan Kiszka | m->m_len -= hlen; |
415 | e6d43cfb | Jan Kiszka | icp = mtod(m, struct icmp *);
|
416 | e6d43cfb | Jan Kiszka | |
417 | e6d43cfb | Jan Kiszka | id = icp->icmp_id; |
418 | 00aa0040 | Blue Swirl | len = qemu_recv(so->s, icp, m->m_len, 0);
|
419 | e6d43cfb | Jan Kiszka | icp->icmp_id = id; |
420 | e6d43cfb | Jan Kiszka | |
421 | e6d43cfb | Jan Kiszka | m->m_data -= hlen; |
422 | e6d43cfb | Jan Kiszka | m->m_len += hlen; |
423 | e6d43cfb | Jan Kiszka | |
424 | e6d43cfb | Jan Kiszka | if (len == -1 || len == 0) { |
425 | e6d43cfb | Jan Kiszka | if (errno == ENETUNREACH) {
|
426 | e6d43cfb | Jan Kiszka | error_code = ICMP_UNREACH_NET; |
427 | e6d43cfb | Jan Kiszka | } else {
|
428 | e6d43cfb | Jan Kiszka | error_code = ICMP_UNREACH_HOST; |
429 | e6d43cfb | Jan Kiszka | } |
430 | e6d43cfb | Jan Kiszka | DEBUG_MISC((dfd, " udp icmp rx errno = %d-%s\n", errno,
|
431 | e6d43cfb | Jan Kiszka | strerror(errno))); |
432 | e6d43cfb | Jan Kiszka | icmp_error(so->so_m, ICMP_UNREACH, error_code, 0, strerror(errno));
|
433 | e6d43cfb | Jan Kiszka | } else {
|
434 | e6d43cfb | Jan Kiszka | icmp_reflect(so->so_m); |
435 | e6d43cfb | Jan Kiszka | so->so_m = NULL; /* Don't m_free() it again! */ |
436 | e6d43cfb | Jan Kiszka | } |
437 | e6d43cfb | Jan Kiszka | icmp_detach(so); |
438 | e6d43cfb | Jan Kiszka | } |