root / slirp / ip_input.c @ 1b2b0af5
History | View | Annotate | Download (17 kB)
1 |
/*
|
---|---|
2 |
* Copyright (c) 1982, 1986, 1988, 1993
|
3 |
* The Regents of the University of California. All rights reserved.
|
4 |
*
|
5 |
* Redistribution and use in source and binary forms, with or without
|
6 |
* modification, are permitted provided that the following conditions
|
7 |
* are met:
|
8 |
* 1. Redistributions of source code must retain the above copyright
|
9 |
* notice, this list of conditions and the following disclaimer.
|
10 |
* 2. Redistributions in binary form must reproduce the above copyright
|
11 |
* notice, this list of conditions and the following disclaimer in the
|
12 |
* documentation and/or other materials provided with the distribution.
|
13 |
* 3. All advertising materials mentioning features or use of this software
|
14 |
* must display the following acknowledgement:
|
15 |
* This product includes software developed by the University of
|
16 |
* California, Berkeley and its contributors.
|
17 |
* 4. Neither the name of the University nor the names of its contributors
|
18 |
* may be used to endorse or promote products derived from this software
|
19 |
* without specific prior written permission.
|
20 |
*
|
21 |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
22 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
23 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
24 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
25 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
26 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
27 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
28 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
29 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
30 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
31 |
* SUCH DAMAGE.
|
32 |
*
|
33 |
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
|
34 |
* ip_input.c,v 1.11 1994/11/16 10:17:08 jkh Exp
|
35 |
*/
|
36 |
|
37 |
/*
|
38 |
* Changes and additions relating to SLiRP are
|
39 |
* Copyright (c) 1995 Danny Gasparovski.
|
40 |
*
|
41 |
* Please read the file COPYRIGHT for the
|
42 |
* terms and conditions of the copyright.
|
43 |
*/
|
44 |
|
45 |
#include <slirp.h> |
46 |
#include "ip_icmp.h" |
47 |
|
48 |
int ip_defttl;
|
49 |
struct ipstat ipstat;
|
50 |
struct ipq ipq;
|
51 |
|
52 |
/*
|
53 |
* IP initialization: fill in IP protocol switch table.
|
54 |
* All protocols not implemented in kernel go to raw IP protocol handler.
|
55 |
*/
|
56 |
void
|
57 |
ip_init() |
58 |
{ |
59 |
ipq.next = ipq.prev = (ipqp_32)&ipq; |
60 |
ip_id = tt.tv_sec & 0xffff;
|
61 |
udp_init(); |
62 |
tcp_init(); |
63 |
ip_defttl = IPDEFTTL; |
64 |
} |
65 |
|
66 |
/*
|
67 |
* Ip input routine. Checksum and byte swap header. If fragmented
|
68 |
* try to reassemble. Process options. Pass to next level.
|
69 |
*/
|
70 |
void
|
71 |
ip_input(m) |
72 |
struct mbuf *m;
|
73 |
{ |
74 |
register struct ip *ip; |
75 |
int hlen;
|
76 |
|
77 |
DEBUG_CALL("ip_input");
|
78 |
DEBUG_ARG("m = %lx", (long)m); |
79 |
DEBUG_ARG("m_len = %d", m->m_len);
|
80 |
|
81 |
ipstat.ips_total++; |
82 |
|
83 |
if (m->m_len < sizeof (struct ip)) { |
84 |
ipstat.ips_toosmall++; |
85 |
return;
|
86 |
} |
87 |
|
88 |
ip = mtod(m, struct ip *);
|
89 |
|
90 |
if (ip->ip_v != IPVERSION) {
|
91 |
ipstat.ips_badvers++; |
92 |
goto bad;
|
93 |
} |
94 |
|
95 |
hlen = ip->ip_hl << 2;
|
96 |
if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */ |
97 |
ipstat.ips_badhlen++; /* or packet too short */
|
98 |
goto bad;
|
99 |
} |
100 |
|
101 |
/* keep ip header intact for ICMP reply
|
102 |
* ip->ip_sum = cksum(m, hlen);
|
103 |
* if (ip->ip_sum) {
|
104 |
*/
|
105 |
if(cksum(m,hlen)) {
|
106 |
ipstat.ips_badsum++; |
107 |
goto bad;
|
108 |
} |
109 |
|
110 |
/*
|
111 |
* Convert fields to host representation.
|
112 |
*/
|
113 |
NTOHS(ip->ip_len); |
114 |
if (ip->ip_len < hlen) {
|
115 |
ipstat.ips_badlen++; |
116 |
goto bad;
|
117 |
} |
118 |
NTOHS(ip->ip_id); |
119 |
NTOHS(ip->ip_off); |
120 |
|
121 |
/*
|
122 |
* Check that the amount of data in the buffers
|
123 |
* is as at least much as the IP header would have us expect.
|
124 |
* Trim mbufs if longer than we expect.
|
125 |
* Drop packet if shorter than we expect.
|
126 |
*/
|
127 |
if (m->m_len < ip->ip_len) {
|
128 |
ipstat.ips_tooshort++; |
129 |
goto bad;
|
130 |
} |
131 |
/* Should drop packet if mbuf too long? hmmm... */
|
132 |
if (m->m_len > ip->ip_len)
|
133 |
m_adj(m, ip->ip_len - m->m_len); |
134 |
|
135 |
/* check ip_ttl for a correct ICMP reply */
|
136 |
if(ip->ip_ttl==0 || ip->ip_ttl==1) { |
137 |
icmp_error(m, ICMP_TIMXCEED,ICMP_TIMXCEED_INTRANS, 0,"ttl"); |
138 |
goto bad;
|
139 |
} |
140 |
|
141 |
/*
|
142 |
* Process options and, if not destined for us,
|
143 |
* ship it on. ip_dooptions returns 1 when an
|
144 |
* error was detected (causing an icmp message
|
145 |
* to be sent and the original packet to be freed).
|
146 |
*/
|
147 |
/* We do no IP options */
|
148 |
/* if (hlen > sizeof (struct ip) && ip_dooptions(m))
|
149 |
* goto next;
|
150 |
*/
|
151 |
/*
|
152 |
* If offset or IP_MF are set, must reassemble.
|
153 |
* Otherwise, nothing need be done.
|
154 |
* (We could look in the reassembly queue to see
|
155 |
* if the packet was previously fragmented,
|
156 |
* but it's not worth the time; just let them time out.)
|
157 |
*
|
158 |
* XXX This should fail, don't fragment yet
|
159 |
*/
|
160 |
if (ip->ip_off &~ IP_DF) {
|
161 |
register struct ipq *fp; |
162 |
/*
|
163 |
* Look for queue of fragments
|
164 |
* of this datagram.
|
165 |
*/
|
166 |
for (fp = (struct ipq *) ipq.next; fp != &ipq; |
167 |
fp = (struct ipq *) fp->next)
|
168 |
if (ip->ip_id == fp->ipq_id &&
|
169 |
ip->ip_src.s_addr == fp->ipq_src.s_addr && |
170 |
ip->ip_dst.s_addr == fp->ipq_dst.s_addr && |
171 |
ip->ip_p == fp->ipq_p) |
172 |
goto found;
|
173 |
fp = 0;
|
174 |
found:
|
175 |
|
176 |
/*
|
177 |
* Adjust ip_len to not reflect header,
|
178 |
* set ip_mff if more fragments are expected,
|
179 |
* convert offset of this to bytes.
|
180 |
*/
|
181 |
ip->ip_len -= hlen; |
182 |
if (ip->ip_off & IP_MF)
|
183 |
((struct ipasfrag *)ip)->ipf_mff |= 1; |
184 |
else
|
185 |
((struct ipasfrag *)ip)->ipf_mff &= ~1; |
186 |
|
187 |
ip->ip_off <<= 3;
|
188 |
|
189 |
/*
|
190 |
* If datagram marked as having more fragments
|
191 |
* or if this is not the first fragment,
|
192 |
* attempt reassembly; if it succeeds, proceed.
|
193 |
*/
|
194 |
if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) { |
195 |
ipstat.ips_fragments++; |
196 |
ip = ip_reass((struct ipasfrag *)ip, fp);
|
197 |
if (ip == 0) |
198 |
return;
|
199 |
ipstat.ips_reassembled++; |
200 |
m = dtom(ip); |
201 |
} else
|
202 |
if (fp)
|
203 |
ip_freef(fp); |
204 |
|
205 |
} else
|
206 |
ip->ip_len -= hlen; |
207 |
|
208 |
/*
|
209 |
* Switch out to protocol's input routine.
|
210 |
*/
|
211 |
ipstat.ips_delivered++; |
212 |
switch (ip->ip_p) {
|
213 |
case IPPROTO_TCP:
|
214 |
tcp_input(m, hlen, (struct socket *)NULL); |
215 |
break;
|
216 |
case IPPROTO_UDP:
|
217 |
udp_input(m, hlen); |
218 |
break;
|
219 |
case IPPROTO_ICMP:
|
220 |
icmp_input(m, hlen); |
221 |
break;
|
222 |
default:
|
223 |
ipstat.ips_noproto++; |
224 |
m_free(m); |
225 |
} |
226 |
return;
|
227 |
bad:
|
228 |
m_freem(m); |
229 |
return;
|
230 |
} |
231 |
|
232 |
/*
|
233 |
* Take incoming datagram fragment and try to
|
234 |
* reassemble it into whole datagram. If a chain for
|
235 |
* reassembly of this datagram already exists, then it
|
236 |
* is given as fp; otherwise have to make a chain.
|
237 |
*/
|
238 |
struct ip *
|
239 |
ip_reass(ip, fp) |
240 |
register struct ipasfrag *ip; |
241 |
register struct ipq *fp; |
242 |
{ |
243 |
register struct mbuf *m = dtom(ip); |
244 |
register struct ipasfrag *q; |
245 |
int hlen = ip->ip_hl << 2; |
246 |
int i, next;
|
247 |
|
248 |
DEBUG_CALL("ip_reass");
|
249 |
DEBUG_ARG("ip = %lx", (long)ip); |
250 |
DEBUG_ARG("fp = %lx", (long)fp); |
251 |
DEBUG_ARG("m = %lx", (long)m); |
252 |
|
253 |
/*
|
254 |
* Presence of header sizes in mbufs
|
255 |
* would confuse code below.
|
256 |
* Fragment m_data is concatenated.
|
257 |
*/
|
258 |
m->m_data += hlen; |
259 |
m->m_len -= hlen; |
260 |
|
261 |
/*
|
262 |
* If first fragment to arrive, create a reassembly queue.
|
263 |
*/
|
264 |
if (fp == 0) { |
265 |
struct mbuf *t;
|
266 |
if ((t = m_get()) == NULL) goto dropfrag; |
267 |
fp = mtod(t, struct ipq *);
|
268 |
insque_32(fp, &ipq); |
269 |
fp->ipq_ttl = IPFRAGTTL; |
270 |
fp->ipq_p = ip->ip_p; |
271 |
fp->ipq_id = ip->ip_id; |
272 |
fp->ipq_next = fp->ipq_prev = (ipasfragp_32)fp; |
273 |
fp->ipq_src = ((struct ip *)ip)->ip_src;
|
274 |
fp->ipq_dst = ((struct ip *)ip)->ip_dst;
|
275 |
q = (struct ipasfrag *)fp;
|
276 |
goto insert;
|
277 |
} |
278 |
|
279 |
/*
|
280 |
* Find a segment which begins after this one does.
|
281 |
*/
|
282 |
for (q = (struct ipasfrag *)fp->ipq_next; q != (struct ipasfrag *)fp; |
283 |
q = (struct ipasfrag *)q->ipf_next)
|
284 |
if (q->ip_off > ip->ip_off)
|
285 |
break;
|
286 |
|
287 |
/*
|
288 |
* If there is a preceding segment, it may provide some of
|
289 |
* our data already. If so, drop the data from the incoming
|
290 |
* segment. If it provides all of our data, drop us.
|
291 |
*/
|
292 |
if (q->ipf_prev != (ipasfragp_32)fp) {
|
293 |
i = ((struct ipasfrag *)(q->ipf_prev))->ip_off +
|
294 |
((struct ipasfrag *)(q->ipf_prev))->ip_len - ip->ip_off;
|
295 |
if (i > 0) { |
296 |
if (i >= ip->ip_len)
|
297 |
goto dropfrag;
|
298 |
m_adj(dtom(ip), i); |
299 |
ip->ip_off += i; |
300 |
ip->ip_len -= i; |
301 |
} |
302 |
} |
303 |
|
304 |
/*
|
305 |
* While we overlap succeeding segments trim them or,
|
306 |
* if they are completely covered, dequeue them.
|
307 |
*/
|
308 |
while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) { |
309 |
i = (ip->ip_off + ip->ip_len) - q->ip_off; |
310 |
if (i < q->ip_len) {
|
311 |
q->ip_len -= i; |
312 |
q->ip_off += i; |
313 |
m_adj(dtom(q), i); |
314 |
break;
|
315 |
} |
316 |
q = (struct ipasfrag *) q->ipf_next;
|
317 |
m_freem(dtom((struct ipasfrag *) q->ipf_prev));
|
318 |
ip_deq((struct ipasfrag *) q->ipf_prev);
|
319 |
} |
320 |
|
321 |
insert:
|
322 |
/*
|
323 |
* Stick new segment in its place;
|
324 |
* check for complete reassembly.
|
325 |
*/
|
326 |
ip_enq(ip, (struct ipasfrag *) q->ipf_prev);
|
327 |
next = 0;
|
328 |
for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp; |
329 |
q = (struct ipasfrag *) q->ipf_next) {
|
330 |
if (q->ip_off != next)
|
331 |
return (0); |
332 |
next += q->ip_len; |
333 |
} |
334 |
if (((struct ipasfrag *)(q->ipf_prev))->ipf_mff & 1) |
335 |
return (0); |
336 |
|
337 |
/*
|
338 |
* Reassembly is complete; concatenate fragments.
|
339 |
*/
|
340 |
q = (struct ipasfrag *) fp->ipq_next;
|
341 |
m = dtom(q); |
342 |
|
343 |
q = (struct ipasfrag *) q->ipf_next;
|
344 |
while (q != (struct ipasfrag *)fp) { |
345 |
struct mbuf *t;
|
346 |
t = dtom(q); |
347 |
m_cat(m, t); |
348 |
q = (struct ipasfrag *) q->ipf_next;
|
349 |
} |
350 |
|
351 |
/*
|
352 |
* Create header for new ip packet by
|
353 |
* modifying header of first packet;
|
354 |
* dequeue and discard fragment reassembly header.
|
355 |
* Make header visible.
|
356 |
*/
|
357 |
ip = (struct ipasfrag *) fp->ipq_next;
|
358 |
|
359 |
/*
|
360 |
* If the fragments concatenated to an mbuf that's
|
361 |
* bigger than the total size of the fragment, then and
|
362 |
* m_ext buffer was alloced. But fp->ipq_next points to
|
363 |
* the old buffer (in the mbuf), so we must point ip
|
364 |
* into the new buffer.
|
365 |
*/
|
366 |
if (m->m_flags & M_EXT) {
|
367 |
int delta;
|
368 |
delta = (char *)ip - m->m_dat;
|
369 |
ip = (struct ipasfrag *)(m->m_ext + delta);
|
370 |
} |
371 |
|
372 |
/* DEBUG_ARG("ip = %lx", (long)ip);
|
373 |
* ip=(struct ipasfrag *)m->m_data; */
|
374 |
|
375 |
ip->ip_len = next; |
376 |
ip->ipf_mff &= ~1;
|
377 |
((struct ip *)ip)->ip_src = fp->ipq_src;
|
378 |
((struct ip *)ip)->ip_dst = fp->ipq_dst;
|
379 |
remque_32(fp); |
380 |
(void) m_free(dtom(fp));
|
381 |
m = dtom(ip); |
382 |
m->m_len += (ip->ip_hl << 2);
|
383 |
m->m_data -= (ip->ip_hl << 2);
|
384 |
|
385 |
return ((struct ip *)ip); |
386 |
|
387 |
dropfrag:
|
388 |
ipstat.ips_fragdropped++; |
389 |
m_freem(m); |
390 |
return (0); |
391 |
} |
392 |
|
393 |
/*
|
394 |
* Free a fragment reassembly header and all
|
395 |
* associated datagrams.
|
396 |
*/
|
397 |
void
|
398 |
ip_freef(fp) |
399 |
struct ipq *fp;
|
400 |
{ |
401 |
register struct ipasfrag *q, *p; |
402 |
|
403 |
for (q = (struct ipasfrag *) fp->ipq_next; q != (struct ipasfrag *)fp; |
404 |
q = p) { |
405 |
p = (struct ipasfrag *) q->ipf_next;
|
406 |
ip_deq(q); |
407 |
m_freem(dtom(q)); |
408 |
} |
409 |
remque_32(fp); |
410 |
(void) m_free(dtom(fp));
|
411 |
} |
412 |
|
413 |
/*
|
414 |
* Put an ip fragment on a reassembly chain.
|
415 |
* Like insque, but pointers in middle of structure.
|
416 |
*/
|
417 |
void
|
418 |
ip_enq(p, prev) |
419 |
register struct ipasfrag *p, *prev; |
420 |
{ |
421 |
DEBUG_CALL("ip_enq");
|
422 |
DEBUG_ARG("prev = %lx", (long)prev); |
423 |
p->ipf_prev = (ipasfragp_32) prev; |
424 |
p->ipf_next = prev->ipf_next; |
425 |
((struct ipasfrag *)(prev->ipf_next))->ipf_prev = (ipasfragp_32) p;
|
426 |
prev->ipf_next = (ipasfragp_32) p; |
427 |
} |
428 |
|
429 |
/*
|
430 |
* To ip_enq as remque is to insque.
|
431 |
*/
|
432 |
void
|
433 |
ip_deq(p) |
434 |
register struct ipasfrag *p; |
435 |
{ |
436 |
((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
|
437 |
((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
|
438 |
} |
439 |
|
440 |
/*
|
441 |
* IP timer processing;
|
442 |
* if a timer expires on a reassembly
|
443 |
* queue, discard it.
|
444 |
*/
|
445 |
void
|
446 |
ip_slowtimo() |
447 |
{ |
448 |
register struct ipq *fp; |
449 |
|
450 |
DEBUG_CALL("ip_slowtimo");
|
451 |
|
452 |
fp = (struct ipq *) ipq.next;
|
453 |
if (fp == 0) |
454 |
return;
|
455 |
|
456 |
while (fp != &ipq) {
|
457 |
--fp->ipq_ttl; |
458 |
fp = (struct ipq *) fp->next;
|
459 |
if (((struct ipq *)(fp->prev))->ipq_ttl == 0) { |
460 |
ipstat.ips_fragtimeout++; |
461 |
ip_freef((struct ipq *) fp->prev);
|
462 |
} |
463 |
} |
464 |
} |
465 |
|
466 |
/*
|
467 |
* Do option processing on a datagram,
|
468 |
* possibly discarding it if bad options are encountered,
|
469 |
* or forwarding it if source-routed.
|
470 |
* Returns 1 if packet has been forwarded/freed,
|
471 |
* 0 if the packet should be processed further.
|
472 |
*/
|
473 |
|
474 |
#ifdef notdef
|
475 |
|
476 |
int
|
477 |
ip_dooptions(m) |
478 |
struct mbuf *m;
|
479 |
{ |
480 |
register struct ip *ip = mtod(m, struct ip *); |
481 |
register u_char *cp;
|
482 |
register struct ip_timestamp *ipt; |
483 |
register struct in_ifaddr *ia; |
484 |
/* int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; */
|
485 |
int opt, optlen, cnt, off, code, type, forward = 0; |
486 |
struct in_addr *sin, dst;
|
487 |
typedef u_int32_t n_time;
|
488 |
n_time ntime; |
489 |
|
490 |
dst = ip->ip_dst; |
491 |
cp = (u_char *)(ip + 1);
|
492 |
cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
493 |
for (; cnt > 0; cnt -= optlen, cp += optlen) { |
494 |
opt = cp[IPOPT_OPTVAL]; |
495 |
if (opt == IPOPT_EOL)
|
496 |
break;
|
497 |
if (opt == IPOPT_NOP)
|
498 |
optlen = 1;
|
499 |
else {
|
500 |
optlen = cp[IPOPT_OLEN]; |
501 |
if (optlen <= 0 || optlen > cnt) { |
502 |
code = &cp[IPOPT_OLEN] - (u_char *)ip; |
503 |
goto bad;
|
504 |
} |
505 |
} |
506 |
switch (opt) {
|
507 |
|
508 |
default:
|
509 |
break;
|
510 |
|
511 |
/*
|
512 |
* Source routing with record.
|
513 |
* Find interface with current destination address.
|
514 |
* If none on this machine then drop if strictly routed,
|
515 |
* or do nothing if loosely routed.
|
516 |
* Record interface address and bring up next address
|
517 |
* component. If strictly routed make sure next
|
518 |
* address is on directly accessible net.
|
519 |
*/
|
520 |
case IPOPT_LSRR:
|
521 |
case IPOPT_SSRR:
|
522 |
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
523 |
code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
524 |
goto bad;
|
525 |
} |
526 |
ipaddr.sin_addr = ip->ip_dst; |
527 |
ia = (struct in_ifaddr *)
|
528 |
ifa_ifwithaddr((struct sockaddr *)&ipaddr);
|
529 |
if (ia == 0) { |
530 |
if (opt == IPOPT_SSRR) {
|
531 |
type = ICMP_UNREACH; |
532 |
code = ICMP_UNREACH_SRCFAIL; |
533 |
goto bad;
|
534 |
} |
535 |
/*
|
536 |
* Loose routing, and not at next destination
|
537 |
* yet; nothing to do except forward.
|
538 |
*/
|
539 |
break;
|
540 |
} |
541 |
off--; / * 0 origin * /
|
542 |
if (off > optlen - sizeof(struct in_addr)) { |
543 |
/*
|
544 |
* End of source route. Should be for us.
|
545 |
*/
|
546 |
save_rte(cp, ip->ip_src); |
547 |
break;
|
548 |
} |
549 |
/*
|
550 |
* locate outgoing interface
|
551 |
*/
|
552 |
bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, |
553 |
sizeof(ipaddr.sin_addr));
|
554 |
if (opt == IPOPT_SSRR) {
|
555 |
#define INA struct in_ifaddr * |
556 |
#define SA struct sockaddr * |
557 |
if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) |
558 |
ia = (INA)ifa_ifwithnet((SA)&ipaddr); |
559 |
} else
|
560 |
ia = ip_rtaddr(ipaddr.sin_addr); |
561 |
if (ia == 0) { |
562 |
type = ICMP_UNREACH; |
563 |
code = ICMP_UNREACH_SRCFAIL; |
564 |
goto bad;
|
565 |
} |
566 |
ip->ip_dst = ipaddr.sin_addr; |
567 |
bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
568 |
(caddr_t)(cp + off), sizeof(struct in_addr)); |
569 |
cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
570 |
/*
|
571 |
* Let ip_intr's mcast routing check handle mcast pkts
|
572 |
*/
|
573 |
forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); |
574 |
break;
|
575 |
|
576 |
case IPOPT_RR:
|
577 |
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
578 |
code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
579 |
goto bad;
|
580 |
} |
581 |
/*
|
582 |
* If no space remains, ignore.
|
583 |
*/
|
584 |
off--; * 0 origin *
|
585 |
if (off > optlen - sizeof(struct in_addr)) |
586 |
break;
|
587 |
bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, |
588 |
sizeof(ipaddr.sin_addr));
|
589 |
/*
|
590 |
* locate outgoing interface; if we're the destination,
|
591 |
* use the incoming interface (should be same).
|
592 |
*/
|
593 |
if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && |
594 |
(ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
|
595 |
type = ICMP_UNREACH; |
596 |
code = ICMP_UNREACH_HOST; |
597 |
goto bad;
|
598 |
} |
599 |
bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
600 |
(caddr_t)(cp + off), sizeof(struct in_addr)); |
601 |
cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
602 |
break;
|
603 |
|
604 |
case IPOPT_TS:
|
605 |
code = cp - (u_char *)ip; |
606 |
ipt = (struct ip_timestamp *)cp;
|
607 |
if (ipt->ipt_len < 5) |
608 |
goto bad;
|
609 |
if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { |
610 |
if (++ipt->ipt_oflw == 0) |
611 |
goto bad;
|
612 |
break;
|
613 |
} |
614 |
sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); |
615 |
switch (ipt->ipt_flg) {
|
616 |
|
617 |
case IPOPT_TS_TSONLY:
|
618 |
break;
|
619 |
|
620 |
case IPOPT_TS_TSANDADDR:
|
621 |
if (ipt->ipt_ptr + sizeof(n_time) + |
622 |
sizeof(struct in_addr) > ipt->ipt_len) |
623 |
goto bad;
|
624 |
ipaddr.sin_addr = dst; |
625 |
ia = (INA)ifaof_ i f p foraddr((SA)&ipaddr, |
626 |
m->m_pkthdr.rcvif); |
627 |
if (ia == 0) |
628 |
continue;
|
629 |
bcopy((caddr_t)&IA_SIN(ia)->sin_addr, |
630 |
(caddr_t)sin, sizeof(struct in_addr)); |
631 |
ipt->ipt_ptr += sizeof(struct in_addr); |
632 |
break;
|
633 |
|
634 |
case IPOPT_TS_PRESPEC:
|
635 |
if (ipt->ipt_ptr + sizeof(n_time) + |
636 |
sizeof(struct in_addr) > ipt->ipt_len) |
637 |
goto bad;
|
638 |
bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr, |
639 |
sizeof(struct in_addr)); |
640 |
if (ifa_ifwithaddr((SA)&ipaddr) == 0) |
641 |
continue;
|
642 |
ipt->ipt_ptr += sizeof(struct in_addr); |
643 |
break;
|
644 |
|
645 |
default:
|
646 |
goto bad;
|
647 |
} |
648 |
ntime = iptime(); |
649 |
bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
|
650 |
sizeof(n_time));
|
651 |
ipt->ipt_ptr += sizeof(n_time);
|
652 |
} |
653 |
} |
654 |
if (forward) {
|
655 |
ip_forward(m, 1);
|
656 |
return (1); |
657 |
} |
658 |
} |
659 |
} |
660 |
return (0); |
661 |
bad:
|
662 |
/* ip->ip_len -= ip->ip_hl << 2; XXX icmp_error adds in hdr length */
|
663 |
|
664 |
/* Not yet */
|
665 |
icmp_error(m, type, code, 0, 0); |
666 |
|
667 |
ipstat.ips_badoptions++; |
668 |
return (1); |
669 |
} |
670 |
|
671 |
#endif /* notdef */ |
672 |
|
673 |
/*
|
674 |
* Strip out IP options, at higher
|
675 |
* level protocol in the kernel.
|
676 |
* Second argument is buffer to which options
|
677 |
* will be moved, and return value is their length.
|
678 |
* (XXX) should be deleted; last arg currently ignored.
|
679 |
*/
|
680 |
void
|
681 |
ip_stripoptions(m, mopt) |
682 |
register struct mbuf *m; |
683 |
struct mbuf *mopt;
|
684 |
{ |
685 |
register int i; |
686 |
struct ip *ip = mtod(m, struct ip *); |
687 |
register caddr_t opts;
|
688 |
int olen;
|
689 |
|
690 |
olen = (ip->ip_hl<<2) - sizeof (struct ip); |
691 |
opts = (caddr_t)(ip + 1);
|
692 |
i = m->m_len - (sizeof (struct ip) + olen); |
693 |
memcpy(opts, opts + olen, (unsigned)i);
|
694 |
m->m_len -= olen; |
695 |
|
696 |
ip->ip_hl = sizeof(struct ip) >> 2; |
697 |
} |