Commit | Line | Data |
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15637ed4 | 1 | /* |
4cf615e1 JH |
2 | * Copyright (c) 1982, 1986, 1988, 1990, 1993 |
3 | * Regents of the University of California. All rights reserved. | |
15637ed4 RG |
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 | * | |
38e82238 | 33 | * from: @(#)ip_output.c 7.23 (Berkeley) 11/12/90 |
4cf615e1 | 34 | * $Id: ip_output.c,v 1.5 1993/12/19 00:52:45 wollman Exp $ |
15637ed4 RG |
35 | */ |
36 | ||
37 | #include "param.h" | |
fde1aeb2 | 38 | #include "systm.h" |
15637ed4 RG |
39 | #include "malloc.h" |
40 | #include "mbuf.h" | |
41 | #include "errno.h" | |
42 | #include "protosw.h" | |
43 | #include "socket.h" | |
44 | #include "socketvar.h" | |
45 | ||
46 | #include "../net/if.h" | |
47 | #include "../net/route.h" | |
48 | ||
49 | #include "in.h" | |
50 | #include "in_systm.h" | |
51 | #include "ip.h" | |
52 | #include "in_pcb.h" | |
53 | #include "in_var.h" | |
54 | #include "ip_var.h" | |
55 | ||
56 | #ifdef vax | |
57 | #include "machine/mtpr.h" | |
58 | #endif | |
59 | ||
60 | struct mbuf *ip_insertoptions(); | |
4cf615e1 | 61 | void ip_mloopback __P((struct ifnet *, struct mbuf *, struct sockaddr_in *)); |
15637ed4 RG |
62 | |
63 | /* | |
64 | * IP output. The packet in mbuf chain m contains a skeletal IP | |
65 | * header (with len, off, ttl, proto, tos, src, dst). | |
66 | * The mbuf chain containing the packet will be freed. | |
67 | * The mbuf opt, if present, will not be freed. | |
68 | */ | |
4c45483e | 69 | int |
4cf615e1 JH |
70 | ip_output(m0, opt, ro, flags |
71 | #ifdef MULTICAST | |
72 | , imo | |
73 | #endif | |
74 | ) | |
15637ed4 RG |
75 | struct mbuf *m0; |
76 | struct mbuf *opt; | |
77 | struct route *ro; | |
78 | int flags; | |
4cf615e1 JH |
79 | #ifdef MULTICAST |
80 | struct ip_moptions *imo; | |
81 | #endif | |
15637ed4 RG |
82 | { |
83 | register struct ip *ip, *mhip; | |
84 | register struct ifnet *ifp; | |
85 | register struct mbuf *m = m0; | |
86 | register int hlen = sizeof (struct ip); | |
87 | int len, off, error = 0; | |
88 | struct route iproute; | |
89 | struct sockaddr_in *dst; | |
90 | struct in_ifaddr *ia; | |
91 | ||
92 | #ifdef DIAGNOSTIC | |
93 | if ((m->m_flags & M_PKTHDR) == 0) | |
94 | panic("ip_output no HDR"); | |
95 | #endif | |
96 | if (opt) { | |
97 | m = ip_insertoptions(m, opt, &len); | |
98 | hlen = len; | |
99 | } | |
100 | ip = mtod(m, struct ip *); | |
101 | /* | |
102 | * Fill in IP header. | |
103 | */ | |
104 | if ((flags & IP_FORWARDING) == 0) { | |
105 | ip->ip_v = IPVERSION; | |
106 | ip->ip_off &= IP_DF; | |
107 | ip->ip_id = htons(ip_id++); | |
108 | ip->ip_hl = hlen >> 2; | |
109 | } else { | |
110 | hlen = ip->ip_hl << 2; | |
111 | ipstat.ips_localout++; | |
112 | } | |
113 | /* | |
114 | * Route packet. | |
115 | */ | |
116 | if (ro == 0) { | |
117 | ro = &iproute; | |
118 | bzero((caddr_t)ro, sizeof (*ro)); | |
119 | } | |
120 | dst = (struct sockaddr_in *)&ro->ro_dst; | |
121 | /* | |
122 | * If there is a cached route, | |
123 | * check that it is to the same destination | |
124 | * and is still up. If not, free it and try again. | |
125 | */ | |
126 | if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || | |
127 | dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { | |
128 | RTFREE(ro->ro_rt); | |
129 | ro->ro_rt = (struct rtentry *)0; | |
130 | } | |
131 | if (ro->ro_rt == 0) { | |
132 | dst->sin_family = AF_INET; | |
133 | dst->sin_len = sizeof(*dst); | |
134 | dst->sin_addr = ip->ip_dst; | |
135 | } | |
136 | /* | |
137 | * If routing to interface only, | |
138 | * short circuit routing lookup. | |
139 | */ | |
140 | if (flags & IP_ROUTETOIF) { | |
141 | ||
142 | ia = (struct in_ifaddr *)ifa_ifwithdstaddr((struct sockaddr *)dst); | |
143 | if (ia == 0) | |
144 | ia = in_iaonnetof(in_netof(ip->ip_dst)); | |
145 | if (ia == 0) { | |
146 | error = ENETUNREACH; | |
147 | goto bad; | |
148 | } | |
149 | ifp = ia->ia_ifp; | |
150 | } else { | |
151 | if (ro->ro_rt == 0) | |
152 | rtalloc(ro); | |
153 | if (ro->ro_rt == 0) { | |
154 | error = EHOSTUNREACH; | |
155 | goto bad; | |
156 | } | |
157 | ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa; | |
158 | ifp = ro->ro_rt->rt_ifp; | |
159 | ro->ro_rt->rt_use++; | |
160 | if (ro->ro_rt->rt_flags & RTF_GATEWAY) | |
161 | dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; | |
162 | } | |
4cf615e1 JH |
163 | #ifdef MULTICAST |
164 | if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { | |
165 | struct in_multi *inm; | |
166 | extern struct ifnet loif; | |
167 | extern struct socket *ip_mrouter; | |
168 | ||
169 | m->m_flags |= M_MCAST; | |
170 | /* | |
171 | * IP destination address is multicast. Make sure "dst" | |
172 | * still points to the address in "ro". (It may have been | |
173 | * changed to point to a gateway address, above.) | |
174 | */ | |
175 | dst = (struct sockaddr_in *)&ro->ro_dst; | |
176 | /* | |
177 | * See if the caller provided any multicast options | |
178 | */ | |
179 | if ((flags & IP_MULTICASTOPTS) && imo != NULL) { | |
180 | ip->ip_ttl = imo->imo_multicast_ttl; | |
181 | if (imo->imo_multicast_ifp != NULL) | |
182 | ifp = imo->imo_multicast_ifp; | |
183 | } else { | |
184 | imo = NULL; | |
185 | ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; | |
186 | } | |
187 | /* | |
188 | * Confirm that the outgoing interface supports multicast. | |
189 | */ | |
190 | if ((ifp->if_flags & IFF_MULTICAST) == 0) { | |
191 | error = ENETUNREACH; | |
192 | goto bad; | |
193 | } | |
194 | /* | |
195 | * If source address not specified yet, use address | |
196 | * of outgoing interface. | |
197 | */ | |
198 | if (ip->ip_src.s_addr == INADDR_ANY) { | |
199 | register struct in_ifaddr *ia; | |
200 | ||
201 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
202 | if (ia->ia_ifp == ifp) { | |
203 | ip->ip_src = IA_SIN(ia)->sin_addr; | |
204 | break; | |
205 | } | |
206 | } | |
207 | ||
208 | IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm); | |
209 | if (inm != NULL && | |
210 | (imo == NULL || imo->imo_multicast_loop)) { | |
211 | /* | |
212 | * If we belong to the destination multicast group | |
213 | * on the outgoing interface, and the caller did not | |
214 | * forbid loopback, loop back a copy. | |
215 | */ | |
216 | ip_mloopback(ifp, m, dst); | |
217 | } | |
218 | #ifdef MROUTING | |
219 | else if (ip_mrouter && (flags & IP_FORWARDING) == 0) { | |
220 | /* | |
221 | * If we are acting as a multicast router, perform | |
222 | * multicast forwarding as if the packet had just | |
223 | * arrived on the interface to which we are about | |
224 | * to send. The multicast forwarding function | |
225 | * recursively calls this function, using the | |
226 | * IP_FORWARDING flag to prevent infinite recursion. | |
227 | * | |
228 | * Multicasts that are looped back by ip_mloopback(), | |
229 | * above, will be forwarded by the ip_input() routine, | |
230 | * if necessary. | |
231 | */ | |
232 | if (ip_mforward(ip, ifp, m) != 0) { | |
233 | m_freem(m); | |
234 | goto done; | |
235 | } | |
236 | } | |
237 | #endif | |
238 | /* | |
239 | * Multicasts with a time-to-live of zero may be looped- | |
240 | * back, above, but must not be transmitted on a network. | |
241 | * Also, multicasts addressed to the loopback interface | |
242 | * are not sent -- the above call to ip_mloopback() will | |
243 | * loop back a copy if this host actually belongs to the | |
244 | * destination group on the loopback interface. | |
245 | */ | |
246 | if (ip->ip_ttl == 0 || ifp == &loif) { | |
247 | m_freem(m); | |
248 | goto done; | |
249 | } | |
250 | ||
251 | goto sendit; | |
252 | } | |
253 | #endif | |
15637ed4 RG |
254 | #ifndef notdef |
255 | /* | |
256 | * If source address not specified yet, use address | |
257 | * of outgoing interface. | |
258 | */ | |
259 | if (ip->ip_src.s_addr == INADDR_ANY) | |
260 | ip->ip_src = IA_SIN(ia)->sin_addr; | |
261 | #endif | |
b8d8ba78 DG |
262 | |
263 | /* | |
264 | * Verify that we have any chance at all of being able to queue | |
265 | * the packet or packet fragments | |
266 | */ | |
267 | if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >= | |
268 | ifp->if_snd.ifq_maxlen) { | |
269 | error = ENOBUFS; | |
270 | goto bad; | |
271 | } | |
272 | ||
15637ed4 RG |
273 | /* |
274 | * Look for broadcast address and | |
275 | * and verify user is allowed to send | |
276 | * such a packet. | |
277 | */ | |
278 | if (in_broadcast(dst->sin_addr)) { | |
279 | if ((ifp->if_flags & IFF_BROADCAST) == 0) { | |
280 | error = EADDRNOTAVAIL; | |
281 | goto bad; | |
282 | } | |
283 | if ((flags & IP_ALLOWBROADCAST) == 0) { | |
284 | error = EACCES; | |
285 | goto bad; | |
286 | } | |
287 | /* don't allow broadcast messages to be fragmented */ | |
288 | if ((u_short)ip->ip_len > ifp->if_mtu) { | |
289 | error = EMSGSIZE; | |
290 | goto bad; | |
291 | } | |
292 | m->m_flags |= M_BCAST; | |
293 | } | |
4cf615e1 JH |
294 | #ifdef MULTICAST |
295 | sendit: | |
296 | #endif | |
15637ed4 RG |
297 | /* |
298 | * If small enough for interface, can just send directly. | |
299 | */ | |
300 | if ((u_short)ip->ip_len <= ifp->if_mtu) { | |
301 | ip->ip_len = htons((u_short)ip->ip_len); | |
302 | ip->ip_off = htons((u_short)ip->ip_off); | |
303 | ip->ip_sum = 0; | |
304 | ip->ip_sum = in_cksum(m, hlen); | |
305 | error = (*ifp->if_output)(ifp, m, | |
306 | (struct sockaddr *)dst, ro->ro_rt); | |
307 | goto done; | |
308 | } | |
309 | ipstat.ips_fragmented++; | |
310 | /* | |
311 | * Too large for interface; fragment if possible. | |
312 | * Must be able to put at least 8 bytes per fragment. | |
313 | */ | |
314 | if (ip->ip_off & IP_DF) { | |
315 | error = EMSGSIZE; | |
316 | goto bad; | |
317 | } | |
318 | len = (ifp->if_mtu - hlen) &~ 7; | |
319 | if (len < 8) { | |
320 | error = EMSGSIZE; | |
321 | goto bad; | |
322 | } | |
323 | ||
324 | { | |
325 | int mhlen, firstlen = len; | |
326 | struct mbuf **mnext = &m->m_nextpkt; | |
327 | ||
328 | /* | |
329 | * Loop through length of segment after first fragment, | |
330 | * make new header and copy data of each part and link onto chain. | |
331 | */ | |
332 | m0 = m; | |
333 | mhlen = sizeof (struct ip); | |
334 | for (off = hlen + len; off < (u_short)ip->ip_len; off += len) { | |
335 | MGETHDR(m, M_DONTWAIT, MT_HEADER); | |
336 | if (m == 0) { | |
337 | error = ENOBUFS; | |
338 | goto sendorfree; | |
339 | } | |
340 | m->m_data += max_linkhdr; | |
341 | mhip = mtod(m, struct ip *); | |
342 | *mhip = *ip; | |
343 | if (hlen > sizeof (struct ip)) { | |
344 | mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); | |
345 | mhip->ip_hl = mhlen >> 2; | |
346 | } | |
347 | m->m_len = mhlen; | |
348 | mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF); | |
349 | if (ip->ip_off & IP_MF) | |
350 | mhip->ip_off |= IP_MF; | |
351 | if (off + len >= (u_short)ip->ip_len) | |
352 | len = (u_short)ip->ip_len - off; | |
353 | else | |
354 | mhip->ip_off |= IP_MF; | |
355 | mhip->ip_len = htons((u_short)(len + mhlen)); | |
356 | m->m_next = m_copy(m0, off, len); | |
357 | if (m->m_next == 0) { | |
358 | error = ENOBUFS; /* ??? */ | |
359 | goto sendorfree; | |
360 | } | |
361 | m->m_pkthdr.len = mhlen + len; | |
362 | m->m_pkthdr.rcvif = (struct ifnet *)0; | |
363 | mhip->ip_off = htons((u_short)mhip->ip_off); | |
364 | mhip->ip_sum = 0; | |
365 | mhip->ip_sum = in_cksum(m, mhlen); | |
366 | *mnext = m; | |
367 | mnext = &m->m_nextpkt; | |
368 | ipstat.ips_ofragments++; | |
369 | } | |
370 | /* | |
371 | * Update first fragment by trimming what's been copied out | |
372 | * and updating header, then send each fragment (in order). | |
373 | */ | |
374 | m = m0; | |
375 | m_adj(m, hlen + firstlen - (u_short)ip->ip_len); | |
376 | m->m_pkthdr.len = hlen + firstlen; | |
377 | ip->ip_len = htons((u_short)m->m_pkthdr.len); | |
378 | ip->ip_off = htons((u_short)(ip->ip_off | IP_MF)); | |
379 | ip->ip_sum = 0; | |
380 | ip->ip_sum = in_cksum(m, hlen); | |
381 | sendorfree: | |
382 | for (m = m0; m; m = m0) { | |
383 | m0 = m->m_nextpkt; | |
384 | m->m_nextpkt = 0; | |
385 | if (error == 0) | |
386 | error = (*ifp->if_output)(ifp, m, | |
387 | (struct sockaddr *)dst, ro->ro_rt); | |
388 | else | |
389 | m_freem(m); | |
390 | } | |
391 | } | |
392 | done: | |
393 | if (ro == &iproute && (flags & IP_ROUTETOIF) == 0 && ro->ro_rt) | |
394 | RTFREE(ro->ro_rt); | |
395 | return (error); | |
396 | bad: | |
397 | m_freem(m0); | |
398 | goto done; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Insert IP options into preformed packet. | |
403 | * Adjust IP destination as required for IP source routing, | |
404 | * as indicated by a non-zero in_addr at the start of the options. | |
405 | */ | |
406 | struct mbuf * | |
407 | ip_insertoptions(m, opt, phlen) | |
408 | register struct mbuf *m; | |
409 | struct mbuf *opt; | |
410 | int *phlen; | |
411 | { | |
412 | register struct ipoption *p = mtod(opt, struct ipoption *); | |
413 | struct mbuf *n; | |
414 | register struct ip *ip = mtod(m, struct ip *); | |
415 | unsigned optlen; | |
416 | ||
417 | optlen = opt->m_len - sizeof(p->ipopt_dst); | |
418 | if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) | |
419 | return (m); /* XXX should fail */ | |
420 | if (p->ipopt_dst.s_addr) | |
421 | ip->ip_dst = p->ipopt_dst; | |
422 | if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { | |
423 | MGETHDR(n, M_DONTWAIT, MT_HEADER); | |
424 | if (n == 0) | |
425 | return (m); | |
426 | n->m_pkthdr.len = m->m_pkthdr.len + optlen; | |
427 | m->m_len -= sizeof(struct ip); | |
428 | m->m_data += sizeof(struct ip); | |
429 | n->m_next = m; | |
430 | m = n; | |
431 | m->m_len = optlen + sizeof(struct ip); | |
432 | m->m_data += max_linkhdr; | |
433 | bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); | |
434 | } else { | |
435 | m->m_data -= optlen; | |
436 | m->m_len += optlen; | |
437 | m->m_pkthdr.len += optlen; | |
438 | ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); | |
439 | } | |
440 | ip = mtod(m, struct ip *); | |
441 | bcopy((caddr_t)p->ipopt_list, (caddr_t)(ip + 1), (unsigned)optlen); | |
442 | *phlen = sizeof(struct ip) + optlen; | |
443 | ip->ip_len += optlen; | |
444 | return (m); | |
445 | } | |
446 | ||
447 | /* | |
448 | * Copy options from ip to jp, | |
449 | * omitting those not copied during fragmentation. | |
450 | */ | |
4c45483e | 451 | int |
15637ed4 RG |
452 | ip_optcopy(ip, jp) |
453 | struct ip *ip, *jp; | |
454 | { | |
455 | register u_char *cp, *dp; | |
456 | int opt, optlen, cnt; | |
457 | ||
458 | cp = (u_char *)(ip + 1); | |
459 | dp = (u_char *)(jp + 1); | |
460 | cnt = (ip->ip_hl << 2) - sizeof (struct ip); | |
461 | for (; cnt > 0; cnt -= optlen, cp += optlen) { | |
462 | opt = cp[0]; | |
463 | if (opt == IPOPT_EOL) | |
464 | break; | |
465 | if (opt == IPOPT_NOP) | |
466 | optlen = 1; | |
467 | else | |
468 | optlen = cp[IPOPT_OLEN]; | |
469 | /* bogus lengths should have been caught by ip_dooptions */ | |
470 | if (optlen > cnt) | |
471 | optlen = cnt; | |
472 | if (IPOPT_COPIED(opt)) { | |
473 | bcopy((caddr_t)cp, (caddr_t)dp, (unsigned)optlen); | |
474 | dp += optlen; | |
475 | } | |
476 | } | |
477 | for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) | |
478 | *dp++ = IPOPT_EOL; | |
479 | return (optlen); | |
480 | } | |
481 | ||
482 | /* | |
483 | * IP socket option processing. | |
484 | */ | |
4c45483e | 485 | int |
15637ed4 RG |
486 | ip_ctloutput(op, so, level, optname, mp) |
487 | int op; | |
488 | struct socket *so; | |
489 | int level, optname; | |
490 | struct mbuf **mp; | |
491 | { | |
492 | register struct inpcb *inp = sotoinpcb(so); | |
493 | register struct mbuf *m = *mp; | |
4c45483e | 494 | register int optval = 0; |
15637ed4 RG |
495 | int error = 0; |
496 | ||
497 | if (level != IPPROTO_IP) | |
498 | error = EINVAL; | |
499 | else switch (op) { | |
500 | ||
501 | case PRCO_SETOPT: | |
502 | switch (optname) { | |
503 | case IP_OPTIONS: | |
504 | #ifdef notyet | |
505 | case IP_RETOPTS: | |
506 | return (ip_pcbopts(optname, &inp->inp_options, m)); | |
507 | #else | |
508 | return (ip_pcbopts(&inp->inp_options, m)); | |
509 | #endif | |
510 | ||
511 | case IP_TOS: | |
512 | case IP_TTL: | |
513 | case IP_RECVOPTS: | |
514 | case IP_RECVRETOPTS: | |
515 | case IP_RECVDSTADDR: | |
516 | if (m->m_len != sizeof(int)) | |
517 | error = EINVAL; | |
518 | else { | |
519 | optval = *mtod(m, int *); | |
520 | switch (optname) { | |
521 | ||
522 | case IP_TOS: | |
523 | inp->inp_ip.ip_tos = optval; | |
524 | break; | |
525 | ||
526 | case IP_TTL: | |
527 | inp->inp_ip.ip_ttl = optval; | |
528 | break; | |
529 | #define OPTSET(bit) \ | |
530 | if (optval) \ | |
531 | inp->inp_flags |= bit; \ | |
532 | else \ | |
533 | inp->inp_flags &= ~bit; | |
534 | ||
535 | case IP_RECVOPTS: | |
536 | OPTSET(INP_RECVOPTS); | |
537 | break; | |
538 | ||
539 | case IP_RECVRETOPTS: | |
540 | OPTSET(INP_RECVRETOPTS); | |
541 | break; | |
542 | ||
543 | case IP_RECVDSTADDR: | |
544 | OPTSET(INP_RECVDSTADDR); | |
545 | break; | |
546 | } | |
547 | } | |
548 | break; | |
549 | #undef OPTSET | |
4cf615e1 JH |
550 | #ifdef MULTICAST |
551 | case IP_MULTICAST_IF: | |
552 | case IP_MULTICAST_TTL: | |
553 | case IP_MULTICAST_LOOP: | |
554 | case IP_ADD_MEMBERSHIP: | |
555 | case IP_DROP_MEMBERSHIP: | |
556 | error = ip_setmoptions(optname, &inp->inp_moptions, m); | |
557 | break; | |
558 | #endif | |
15637ed4 RG |
559 | default: |
560 | error = EINVAL; | |
561 | break; | |
562 | } | |
563 | if (m) | |
564 | (void)m_free(m); | |
565 | break; | |
566 | ||
567 | case PRCO_GETOPT: | |
568 | switch (optname) { | |
569 | case IP_OPTIONS: | |
570 | case IP_RETOPTS: | |
571 | *mp = m = m_get(M_WAIT, MT_SOOPTS); | |
572 | if (inp->inp_options) { | |
573 | m->m_len = inp->inp_options->m_len; | |
574 | bcopy(mtod(inp->inp_options, caddr_t), | |
575 | mtod(m, caddr_t), (unsigned)m->m_len); | |
576 | } else | |
577 | m->m_len = 0; | |
578 | break; | |
579 | ||
580 | case IP_TOS: | |
581 | case IP_TTL: | |
582 | case IP_RECVOPTS: | |
583 | case IP_RECVRETOPTS: | |
584 | case IP_RECVDSTADDR: | |
585 | *mp = m = m_get(M_WAIT, MT_SOOPTS); | |
586 | m->m_len = sizeof(int); | |
587 | switch (optname) { | |
588 | ||
589 | case IP_TOS: | |
590 | optval = inp->inp_ip.ip_tos; | |
591 | break; | |
592 | ||
593 | case IP_TTL: | |
594 | optval = inp->inp_ip.ip_ttl; | |
595 | break; | |
596 | ||
597 | #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) | |
598 | ||
599 | case IP_RECVOPTS: | |
600 | optval = OPTBIT(INP_RECVOPTS); | |
601 | break; | |
602 | ||
603 | case IP_RECVRETOPTS: | |
604 | optval = OPTBIT(INP_RECVRETOPTS); | |
605 | break; | |
606 | ||
607 | case IP_RECVDSTADDR: | |
608 | optval = OPTBIT(INP_RECVDSTADDR); | |
609 | break; | |
610 | } | |
611 | *mtod(m, int *) = optval; | |
612 | break; | |
4cf615e1 JH |
613 | #ifdef MULTICAST |
614 | case IP_MULTICAST_IF: | |
615 | case IP_MULTICAST_TTL: | |
616 | case IP_MULTICAST_LOOP: | |
617 | case IP_ADD_MEMBERSHIP: | |
618 | case IP_DROP_MEMBERSHIP: | |
619 | error = ip_getmoptions(optname, inp->inp_moptions, mp); | |
620 | break; | |
621 | #endif | |
15637ed4 RG |
622 | default: |
623 | error = EINVAL; | |
624 | break; | |
625 | } | |
626 | break; | |
627 | } | |
628 | return (error); | |
629 | } | |
630 | ||
631 | /* | |
632 | * Set up IP options in pcb for insertion in output packets. | |
633 | * Store in mbuf with pointer in pcbopt, adding pseudo-option | |
634 | * with destination address if source routed. | |
635 | */ | |
4c45483e | 636 | int |
15637ed4 RG |
637 | #ifdef notyet |
638 | ip_pcbopts(optname, pcbopt, m) | |
639 | int optname; | |
640 | #else | |
641 | ip_pcbopts(pcbopt, m) | |
642 | #endif | |
643 | struct mbuf **pcbopt; | |
644 | register struct mbuf *m; | |
645 | { | |
646 | register cnt, optlen; | |
647 | register u_char *cp; | |
648 | u_char opt; | |
649 | ||
650 | /* turn off any old options */ | |
651 | if (*pcbopt) | |
652 | (void)m_free(*pcbopt); | |
653 | *pcbopt = 0; | |
654 | if (m == (struct mbuf *)0 || m->m_len == 0) { | |
655 | /* | |
656 | * Only turning off any previous options. | |
657 | */ | |
658 | if (m) | |
659 | (void)m_free(m); | |
660 | return (0); | |
661 | } | |
662 | ||
663 | #ifndef vax | |
664 | if (m->m_len % sizeof(long)) | |
665 | goto bad; | |
666 | #endif | |
667 | /* | |
668 | * IP first-hop destination address will be stored before | |
669 | * actual options; move other options back | |
670 | * and clear it when none present. | |
671 | */ | |
672 | if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) | |
673 | goto bad; | |
674 | cnt = m->m_len; | |
675 | m->m_len += sizeof(struct in_addr); | |
676 | cp = mtod(m, u_char *) + sizeof(struct in_addr); | |
677 | ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt); | |
678 | bzero(mtod(m, caddr_t), sizeof(struct in_addr)); | |
679 | ||
680 | for (; cnt > 0; cnt -= optlen, cp += optlen) { | |
681 | opt = cp[IPOPT_OPTVAL]; | |
682 | if (opt == IPOPT_EOL) | |
683 | break; | |
684 | if (opt == IPOPT_NOP) | |
685 | optlen = 1; | |
686 | else { | |
687 | optlen = cp[IPOPT_OLEN]; | |
688 | if (optlen <= IPOPT_OLEN || optlen > cnt) | |
689 | goto bad; | |
690 | } | |
691 | switch (opt) { | |
692 | ||
693 | default: | |
694 | break; | |
695 | ||
696 | case IPOPT_LSRR: | |
697 | case IPOPT_SSRR: | |
698 | /* | |
699 | * user process specifies route as: | |
700 | * ->A->B->C->D | |
701 | * D must be our final destination (but we can't | |
702 | * check that since we may not have connected yet). | |
703 | * A is first hop destination, which doesn't appear in | |
704 | * actual IP option, but is stored before the options. | |
705 | */ | |
706 | if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) | |
707 | goto bad; | |
708 | m->m_len -= sizeof(struct in_addr); | |
709 | cnt -= sizeof(struct in_addr); | |
710 | optlen -= sizeof(struct in_addr); | |
711 | cp[IPOPT_OLEN] = optlen; | |
712 | /* | |
713 | * Move first hop before start of options. | |
714 | */ | |
715 | bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), | |
716 | sizeof(struct in_addr)); | |
717 | /* | |
718 | * Then copy rest of options back | |
719 | * to close up the deleted entry. | |
720 | */ | |
721 | ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] + | |
722 | sizeof(struct in_addr)), | |
723 | (caddr_t)&cp[IPOPT_OFFSET+1], | |
724 | (unsigned)cnt + sizeof(struct in_addr)); | |
725 | break; | |
726 | } | |
727 | } | |
728 | if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) | |
729 | goto bad; | |
730 | *pcbopt = m; | |
731 | return (0); | |
732 | ||
733 | bad: | |
734 | (void)m_free(m); | |
735 | return (EINVAL); | |
736 | } | |
4cf615e1 JH |
737 | |
738 | #ifdef MULTICAST | |
739 | /* | |
740 | * Set the IP multicast options in response to user setsockopt(). | |
741 | */ | |
742 | int | |
743 | ip_setmoptions(optname, imop, m) | |
744 | int optname; | |
745 | struct ip_moptions **imop; | |
746 | struct mbuf *m; | |
747 | { | |
748 | register int error = 0; | |
749 | u_char loop; | |
750 | register int i; | |
751 | struct in_addr addr; | |
752 | register struct ip_mreq *mreq; | |
753 | register struct ifnet *ifp; | |
754 | register struct ip_moptions *imo = *imop; | |
755 | struct route ro; | |
756 | register struct sockaddr_in *dst; | |
757 | ||
758 | if (imo == NULL) { | |
759 | /* | |
760 | * No multicast option buffer attached to the pcb; | |
761 | * allocate one and initialize to default values. | |
762 | */ | |
763 | imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, | |
764 | M_WAITOK); | |
765 | ||
766 | if (imo == NULL) | |
767 | return (ENOBUFS); | |
768 | *imop = imo; | |
769 | imo->imo_multicast_ifp = NULL; | |
770 | imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; | |
771 | imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; | |
772 | imo->imo_num_memberships = 0; | |
773 | } | |
774 | ||
775 | switch (optname) { | |
776 | ||
777 | case IP_MULTICAST_IF: | |
778 | /* | |
779 | * Select the interface for outgoing multicast packets. | |
780 | */ | |
781 | if (m == NULL || m->m_len != sizeof(struct in_addr)) { | |
782 | error = EINVAL; | |
783 | break; | |
784 | } | |
785 | addr = *(mtod(m, struct in_addr *)); | |
786 | /* | |
787 | * INADDR_ANY is used to remove a previous selection. | |
788 | * When no interface is selected, a default one is | |
789 | * chosen every time a multicast packet is sent. | |
790 | */ | |
791 | if (addr.s_addr == INADDR_ANY) { | |
792 | imo->imo_multicast_ifp = NULL; | |
793 | break; | |
794 | } | |
795 | /* | |
796 | * The selected interface is identified by its local | |
797 | * IP address. Find the interface and confirm that | |
798 | * it supports multicasting. | |
799 | */ | |
800 | INADDR_TO_IFP(addr, ifp); | |
801 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { | |
802 | error = EADDRNOTAVAIL; | |
803 | break; | |
804 | } | |
805 | imo->imo_multicast_ifp = ifp; | |
806 | break; | |
807 | ||
808 | case IP_MULTICAST_TTL: | |
809 | /* | |
810 | * Set the IP time-to-live for outgoing multicast packets. | |
811 | */ | |
812 | if (m == NULL || m->m_len != 1) { | |
813 | error = EINVAL; | |
814 | break; | |
815 | } | |
816 | imo->imo_multicast_ttl = *(mtod(m, u_char *)); | |
817 | break; | |
818 | ||
819 | case IP_MULTICAST_LOOP: | |
820 | /* | |
821 | * Set the loopback flag for outgoing multicast packets. | |
822 | * Must be zero or one. | |
823 | */ | |
824 | if (m == NULL || m->m_len != 1 || | |
825 | (loop = *(mtod(m, u_char *))) > 1) { | |
826 | error = EINVAL; | |
827 | break; | |
828 | } | |
829 | imo->imo_multicast_loop = loop; | |
830 | break; | |
831 | ||
832 | case IP_ADD_MEMBERSHIP: | |
833 | /* | |
834 | * Add a multicast group membership. | |
835 | * Group must be a valid IP multicast address. | |
836 | */ | |
837 | if (m == NULL || m->m_len != sizeof(struct ip_mreq)) { | |
838 | error = EINVAL; | |
839 | break; | |
840 | } | |
841 | mreq = mtod(m, struct ip_mreq *); | |
842 | if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { | |
843 | error = EINVAL; | |
844 | break; | |
845 | } | |
846 | /* | |
847 | * If no interface address was provided, use the interface of | |
848 | * the route to the given multicast address. | |
849 | */ | |
850 | if (mreq->imr_interface.s_addr == INADDR_ANY) { | |
851 | ro.ro_rt = NULL; | |
852 | dst = (struct sockaddr_in *)&ro.ro_dst; | |
853 | dst->sin_len = sizeof(*dst); | |
854 | dst->sin_family = AF_INET; | |
855 | dst->sin_addr = mreq->imr_multiaddr; | |
856 | rtalloc(&ro); | |
857 | if (ro.ro_rt == NULL) { | |
858 | error = EADDRNOTAVAIL; | |
859 | break; | |
860 | } | |
861 | ifp = ro.ro_rt->rt_ifp; | |
862 | rtfree(ro.ro_rt); | |
863 | } | |
864 | else { | |
865 | INADDR_TO_IFP(mreq->imr_interface, ifp); | |
866 | } | |
867 | /* | |
868 | * See if we found an interface, and confirm that it | |
869 | * supports multicast. | |
870 | */ | |
871 | if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { | |
872 | error = EADDRNOTAVAIL; | |
873 | break; | |
874 | } | |
875 | /* | |
876 | * See if the membership already exists or if all the | |
877 | * membership slots are full. | |
878 | */ | |
879 | for (i = 0; i < imo->imo_num_memberships; ++i) { | |
880 | if (imo->imo_membership[i]->inm_ifp == ifp && | |
881 | imo->imo_membership[i]->inm_addr.s_addr | |
882 | == mreq->imr_multiaddr.s_addr) | |
883 | break; | |
884 | } | |
885 | if (i < imo->imo_num_memberships) { | |
886 | error = EADDRINUSE; | |
887 | break; | |
888 | } | |
889 | if (i == IP_MAX_MEMBERSHIPS) { | |
890 | error = ETOOMANYREFS; | |
891 | break; | |
892 | } | |
893 | /* | |
894 | * Everything looks good; add a new record to the multicast | |
895 | * address list for the given interface. | |
896 | */ | |
897 | if ((imo->imo_membership[i] = | |
898 | in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) { | |
899 | error = ENOBUFS; | |
900 | break; | |
901 | } | |
902 | ++imo->imo_num_memberships; | |
903 | break; | |
904 | ||
905 | case IP_DROP_MEMBERSHIP: | |
906 | /* | |
907 | * Drop a multicast group membership. | |
908 | * Group must be a valid IP multicast address. | |
909 | */ | |
910 | if (m == NULL || m->m_len != sizeof(struct ip_mreq)) { | |
911 | error = EINVAL; | |
912 | break; | |
913 | } | |
914 | mreq = mtod(m, struct ip_mreq *); | |
915 | if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { | |
916 | error = EINVAL; | |
917 | break; | |
918 | } | |
919 | /* | |
920 | * If an interface address was specified, get a pointer | |
921 | * to its ifnet structure. | |
922 | */ | |
923 | if (mreq->imr_interface.s_addr == INADDR_ANY) | |
924 | ifp = NULL; | |
925 | else { | |
926 | INADDR_TO_IFP(mreq->imr_interface, ifp); | |
927 | if (ifp == NULL) { | |
928 | error = EADDRNOTAVAIL; | |
929 | break; | |
930 | } | |
931 | } | |
932 | /* | |
933 | * Find the membership in the membership array. | |
934 | */ | |
935 | for (i = 0; i < imo->imo_num_memberships; ++i) { | |
936 | if ((ifp == NULL || | |
937 | imo->imo_membership[i]->inm_ifp == ifp) && | |
938 | imo->imo_membership[i]->inm_addr.s_addr == | |
939 | mreq->imr_multiaddr.s_addr) | |
940 | break; | |
941 | } | |
942 | if (i == imo->imo_num_memberships) { | |
943 | error = EADDRNOTAVAIL; | |
944 | break; | |
945 | } | |
946 | /* | |
947 | * Give up the multicast address record to which the | |
948 | * membership points. | |
949 | */ | |
950 | in_delmulti(imo->imo_membership[i]); | |
951 | /* | |
952 | * Remove the gap in the membership array. | |
953 | */ | |
954 | for (++i; i < imo->imo_num_memberships; ++i) | |
955 | imo->imo_membership[i-1] = imo->imo_membership[i]; | |
956 | --imo->imo_num_memberships; | |
957 | break; | |
958 | ||
959 | default: | |
960 | error = EOPNOTSUPP; | |
961 | break; | |
962 | } | |
963 | ||
964 | /* | |
965 | * If all options have default values, no need to keep the mbuf. | |
966 | */ | |
967 | if (imo->imo_multicast_ifp == NULL && | |
968 | imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && | |
969 | imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && | |
970 | imo->imo_num_memberships == 0) { | |
971 | free(*imop, M_IPMOPTS); | |
972 | *imop = NULL; | |
973 | } | |
974 | ||
975 | return (error); | |
976 | } | |
977 | ||
978 | /* | |
979 | * Return the IP multicast options in response to user getsockopt(). | |
980 | */ | |
981 | int | |
982 | ip_getmoptions(optname, imo, mp) | |
983 | int optname; | |
984 | register struct ip_moptions *imo; | |
985 | register struct mbuf **mp; | |
986 | { | |
987 | u_char *ttl; | |
988 | u_char *loop; | |
989 | struct in_addr *addr; | |
990 | struct in_ifaddr *ia; | |
991 | ||
992 | *mp = m_get(M_WAIT, MT_SOOPTS); | |
993 | ||
994 | switch (optname) { | |
995 | ||
996 | case IP_MULTICAST_IF: | |
997 | addr = mtod(*mp, struct in_addr *); | |
998 | (*mp)->m_len = sizeof(struct in_addr); | |
999 | if (imo == NULL || imo->imo_multicast_ifp == NULL) | |
1000 | addr->s_addr = INADDR_ANY; | |
1001 | else { | |
1002 | IFP_TO_IA(imo->imo_multicast_ifp, ia); | |
1003 | addr->s_addr = (ia == NULL) ? INADDR_ANY | |
1004 | : IA_SIN(ia)->sin_addr.s_addr; | |
1005 | } | |
1006 | return (0); | |
1007 | ||
1008 | case IP_MULTICAST_TTL: | |
1009 | ttl = mtod(*mp, u_char *); | |
1010 | (*mp)->m_len = 1; | |
1011 | *ttl = (imo == NULL) ? IP_DEFAULT_MULTICAST_TTL | |
1012 | : imo->imo_multicast_ttl; | |
1013 | return (0); | |
1014 | ||
1015 | case IP_MULTICAST_LOOP: | |
1016 | loop = mtod(*mp, u_char *); | |
1017 | (*mp)->m_len = 1; | |
1018 | *loop = (imo == NULL) ? IP_DEFAULT_MULTICAST_LOOP | |
1019 | : imo->imo_multicast_loop; | |
1020 | return (0); | |
1021 | ||
1022 | default: | |
1023 | return (EOPNOTSUPP); | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Discard the IP multicast options. | |
1029 | */ | |
1030 | void | |
1031 | ip_freemoptions(imo) | |
1032 | register struct ip_moptions *imo; | |
1033 | { | |
1034 | register int i; | |
1035 | ||
1036 | if (imo != NULL) { | |
1037 | for (i = 0; i < imo->imo_num_memberships; ++i) | |
1038 | in_delmulti(imo->imo_membership[i]); | |
1039 | free(imo, M_IPMOPTS); | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * Routine called from ip_output() to loop back a copy of an IP multicast | |
1045 | * packet to the input queue of a specified interface. Note that this | |
1046 | * calls the output routine of the loopback "driver", but with an interface | |
1047 | * pointer that might NOT be &loif -- easier than replicating that code here. | |
1048 | */ | |
1049 | void | |
1050 | ip_mloopback(ifp, m, dst) | |
1051 | struct ifnet *ifp; | |
1052 | register struct mbuf *m; | |
1053 | register struct sockaddr_in *dst; | |
1054 | { | |
1055 | register struct ip *ip; | |
1056 | struct mbuf *copym; | |
1057 | ||
1058 | copym = m_copy(m, 0, M_COPYALL); | |
1059 | if (copym != NULL) { | |
1060 | /* | |
1061 | * We don't bother to fragment if the IP length is greater | |
1062 | * than the interface's MTU. Can this possibly matter? | |
1063 | */ | |
1064 | ip = mtod(copym, struct ip *); | |
1065 | ip->ip_len = htons((u_short)ip->ip_len); | |
1066 | ip->ip_off = htons((u_short)ip->ip_off); | |
1067 | ip->ip_sum = 0; | |
1068 | ip->ip_sum = in_cksum(copym, ip->ip_hl << 2); | |
1069 | (void) looutput(ifp, copym, (struct sockaddr *)dst, 0); | |
1070 | } | |
1071 | } | |
1072 | #endif |