proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / netinet / ip_output.c
CommitLineData
984263bc
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1/*
2 * Copyright (c) 1982, 1986, 1988, 1990, 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_output.c 8.3 (Berkeley) 1/21/94
34 * $FreeBSD: src/sys/netinet/ip_output.c,v 1.99.2.37 2003/04/15 06:44:45 silby Exp $
dadab5e9 35 * $DragonFly: src/sys/netinet/ip_output.c,v 1.3 2003/06/25 03:56:04 dillon Exp $
984263bc
MD
36 */
37
38#define _IP_VHL
39
40#include "opt_ipfw.h"
41#include "opt_ipdn.h"
42#include "opt_ipdivert.h"
43#include "opt_ipfilter.h"
44#include "opt_ipsec.h"
45#include "opt_random_ip_id.h"
46#include "opt_mbuf_stress_test.h"
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/kernel.h>
51#include <sys/malloc.h>
52#include <sys/mbuf.h>
53#include <sys/protosw.h>
54#include <sys/socket.h>
55#include <sys/socketvar.h>
56#include <sys/proc.h>
57#include <sys/sysctl.h>
58
59#include <net/if.h>
60#include <net/route.h>
61
62#include <netinet/in.h>
63#include <netinet/in_systm.h>
64#include <netinet/ip.h>
65#include <netinet/in_pcb.h>
66#include <netinet/in_var.h>
67#include <netinet/ip_var.h>
68
69#include <machine/in_cksum.h>
70
71static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
72
73#ifdef IPSEC
74#include <netinet6/ipsec.h>
75#include <netkey/key.h>
76#ifdef IPSEC_DEBUG
77#include <netkey/key_debug.h>
78#else
79#define KEYDEBUG(lev,arg)
80#endif
81#endif /*IPSEC*/
82
83#ifdef FAST_IPSEC
84#include <netipsec/ipsec.h>
85#include <netipsec/xform.h>
86#include <netipsec/key.h>
87#endif /*FAST_IPSEC*/
88
89#include <netinet/ip_fw.h>
90#include <netinet/ip_dummynet.h>
91
92#define print_ip(x, a, y) printf("%s %d.%d.%d.%d%s",\
93 x, (ntohl(a.s_addr)>>24)&0xFF,\
94 (ntohl(a.s_addr)>>16)&0xFF,\
95 (ntohl(a.s_addr)>>8)&0xFF,\
96 (ntohl(a.s_addr))&0xFF, y);
97
98u_short ip_id;
99
100#ifdef MBUF_STRESS_TEST
101int mbuf_frag_size = 0;
102SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
103 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
104#endif
105
106static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
107static struct ifnet *ip_multicast_if(struct in_addr *, int *);
108static void ip_mloopback
109 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int);
110static int ip_getmoptions
111 (struct sockopt *, struct ip_moptions *);
112static int ip_pcbopts(int, struct mbuf **, struct mbuf *);
113static int ip_setmoptions
114 (struct sockopt *, struct ip_moptions **);
115
116int ip_optcopy(struct ip *, struct ip *);
117extern int (*fr_checkp) (struct ip *, int, struct ifnet *, int, struct mbuf **);
118
119
120extern struct protosw inetsw[];
121
122/*
123 * IP output. The packet in mbuf chain m contains a skeletal IP
124 * header (with len, off, ttl, proto, tos, src, dst).
125 * The mbuf chain containing the packet will be freed.
126 * The mbuf opt, if present, will not be freed.
127 */
128int
129ip_output(m0, opt, ro, flags, imo, inp)
130 struct mbuf *m0;
131 struct mbuf *opt;
132 struct route *ro;
133 int flags;
134 struct ip_moptions *imo;
135 struct inpcb *inp;
136{
137 struct ip *ip, *mhip;
138 struct ifnet *ifp = NULL; /* keep compiler happy */
139 struct mbuf *m;
140 int hlen = sizeof (struct ip);
141 int len, off, error = 0;
142 struct sockaddr_in *dst = NULL; /* keep compiler happy */
143 struct in_ifaddr *ia = NULL;
144 int isbroadcast, sw_csum;
145 struct in_addr pkt_dst;
146#ifdef IPSEC
147 struct route iproute;
148 struct secpolicy *sp = NULL;
149 struct socket *so = inp ? inp->inp_socket : NULL;
150#endif
151#ifdef FAST_IPSEC
152 struct route iproute;
153 struct m_tag *mtag;
154 struct secpolicy *sp = NULL;
155 struct tdb_ident *tdbi;
156 int s;
157#endif /* FAST_IPSEC */
158 struct ip_fw_args args;
159 int src_was_INADDR_ANY = 0; /* as the name says... */
160
161 args.eh = NULL;
162 args.rule = NULL;
163 args.next_hop = NULL;
164 args.divert_rule = 0; /* divert cookie */
165
166 /* Grab info from MT_TAG mbufs prepended to the chain. */
167 for (; m0 && m0->m_type == MT_TAG; m0 = m0->m_next) {
168 switch(m0->_m_tag_id) {
169 default:
170 printf("ip_output: unrecognised MT_TAG tag %d\n",
171 m0->_m_tag_id);
172 break;
173
174 case PACKET_TAG_DUMMYNET:
175 /*
176 * the packet was already tagged, so part of the
177 * processing was already done, and we need to go down.
178 * Get parameters from the header.
179 */
180 args.rule = ((struct dn_pkt *)m0)->rule;
181 opt = NULL ;
182 ro = & ( ((struct dn_pkt *)m0)->ro ) ;
183 imo = NULL ;
184 dst = ((struct dn_pkt *)m0)->dn_dst ;
185 ifp = ((struct dn_pkt *)m0)->ifp ;
186 flags = ((struct dn_pkt *)m0)->flags ;
187 break;
188
189 case PACKET_TAG_DIVERT:
190 args.divert_rule = (int)m0->m_data & 0xffff;
191 break;
192
193 case PACKET_TAG_IPFORWARD:
194 args.next_hop = (struct sockaddr_in *)m0->m_data;
195 break;
196 }
197 }
198 m = m0;
199
200 KASSERT(!m || (m->m_flags & M_PKTHDR) != 0, ("ip_output: no HDR"));
201#ifndef FAST_IPSEC
202 KASSERT(ro != NULL, ("ip_output: no route, proto %d",
203 mtod(m, struct ip *)->ip_p));
204#endif
205
206 if (args.rule != NULL) { /* dummynet already saw us */
207 ip = mtod(m, struct ip *);
208 hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
209 if (ro->ro_rt)
210 ia = ifatoia(ro->ro_rt->rt_ifa);
211 goto sendit;
212 }
213
214 if (opt) {
215 len = 0;
216 m = ip_insertoptions(m, opt, &len);
217 if (len != 0)
218 hlen = len;
219 }
220 ip = mtod(m, struct ip *);
221 pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst;
222
223 /*
224 * Fill in IP header.
225 */
226 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
227 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
228 ip->ip_off &= IP_DF;
229#ifdef RANDOM_IP_ID
230 ip->ip_id = ip_randomid();
231#else
232 ip->ip_id = htons(ip_id++);
233#endif
234 ipstat.ips_localout++;
235 } else {
236 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
237 }
238
239#ifdef FAST_IPSEC
240 if (ro == NULL) {
241 ro = &iproute;
242 bzero(ro, sizeof (*ro));
243 }
244#endif /* FAST_IPSEC */
245 dst = (struct sockaddr_in *)&ro->ro_dst;
246 /*
247 * If there is a cached route,
248 * check that it is to the same destination
249 * and is still up. If not, free it and try again.
250 * The address family should also be checked in case of sharing the
251 * cache with IPv6.
252 */
253 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
254 dst->sin_family != AF_INET ||
255 dst->sin_addr.s_addr != pkt_dst.s_addr)) {
256 RTFREE(ro->ro_rt);
257 ro->ro_rt = (struct rtentry *)0;
258 }
259 if (ro->ro_rt == 0) {
260 bzero(dst, sizeof(*dst));
261 dst->sin_family = AF_INET;
262 dst->sin_len = sizeof(*dst);
263 dst->sin_addr = pkt_dst;
264 }
265 /*
266 * If routing to interface only,
267 * short circuit routing lookup.
268 */
269 if (flags & IP_ROUTETOIF) {
270 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 &&
271 (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
272 ipstat.ips_noroute++;
273 error = ENETUNREACH;
274 goto bad;
275 }
276 ifp = ia->ia_ifp;
277 ip->ip_ttl = 1;
278 isbroadcast = in_broadcast(dst->sin_addr, ifp);
279 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
280 imo != NULL && imo->imo_multicast_ifp != NULL) {
281 /*
282 * Bypass the normal routing lookup for multicast
283 * packets if the interface is specified.
284 */
285 ifp = imo->imo_multicast_ifp;
286 IFP_TO_IA(ifp, ia);
287 isbroadcast = 0; /* fool gcc */
288 } else {
289 /*
290 * If this is the case, we probably don't want to allocate
291 * a protocol-cloned route since we didn't get one from the
292 * ULP. This lets TCP do its thing, while not burdening
293 * forwarding or ICMP with the overhead of cloning a route.
294 * Of course, we still want to do any cloning requested by
295 * the link layer, as this is probably required in all cases
296 * for correct operation (as it is for ARP).
297 */
298 if (ro->ro_rt == 0)
299 rtalloc_ign(ro, RTF_PRCLONING);
300 if (ro->ro_rt == 0) {
301 ipstat.ips_noroute++;
302 error = EHOSTUNREACH;
303 goto bad;
304 }
305 ia = ifatoia(ro->ro_rt->rt_ifa);
306 ifp = ro->ro_rt->rt_ifp;
307 ro->ro_rt->rt_use++;
308 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
309 dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
310 if (ro->ro_rt->rt_flags & RTF_HOST)
311 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
312 else
313 isbroadcast = in_broadcast(dst->sin_addr, ifp);
314 }
315 if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
316 struct in_multi *inm;
317
318 m->m_flags |= M_MCAST;
319 /*
320 * IP destination address is multicast. Make sure "dst"
321 * still points to the address in "ro". (It may have been
322 * changed to point to a gateway address, above.)
323 */
324 dst = (struct sockaddr_in *)&ro->ro_dst;
325 /*
326 * See if the caller provided any multicast options
327 */
328 if (imo != NULL) {
329 ip->ip_ttl = imo->imo_multicast_ttl;
330 if (imo->imo_multicast_vif != -1)
331 ip->ip_src.s_addr =
332 ip_mcast_src ?
333 ip_mcast_src(imo->imo_multicast_vif) :
334 INADDR_ANY;
335 } else
336 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
337 /*
338 * Confirm that the outgoing interface supports multicast.
339 */
340 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
341 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
342 ipstat.ips_noroute++;
343 error = ENETUNREACH;
344 goto bad;
345 }
346 }
347 /*
348 * If source address not specified yet, use address
349 * of outgoing interface.
350 */
351 if (ip->ip_src.s_addr == INADDR_ANY) {
352 /* Interface may have no addresses. */
353 if (ia != NULL)
354 ip->ip_src = IA_SIN(ia)->sin_addr;
355 }
356
357 IN_LOOKUP_MULTI(pkt_dst, ifp, inm);
358 if (inm != NULL &&
359 (imo == NULL || imo->imo_multicast_loop)) {
360 /*
361 * If we belong to the destination multicast group
362 * on the outgoing interface, and the caller did not
363 * forbid loopback, loop back a copy.
364 */
365 ip_mloopback(ifp, m, dst, hlen);
366 }
367 else {
368 /*
369 * If we are acting as a multicast router, perform
370 * multicast forwarding as if the packet had just
371 * arrived on the interface to which we are about
372 * to send. The multicast forwarding function
373 * recursively calls this function, using the
374 * IP_FORWARDING flag to prevent infinite recursion.
375 *
376 * Multicasts that are looped back by ip_mloopback(),
377 * above, will be forwarded by the ip_input() routine,
378 * if necessary.
379 */
380 if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
381 /*
382 * If rsvp daemon is not running, do not
383 * set ip_moptions. This ensures that the packet
384 * is multicast and not just sent down one link
385 * as prescribed by rsvpd.
386 */
387 if (!rsvp_on)
388 imo = NULL;
389 if (ip_mforward &&
390 ip_mforward(ip, ifp, m, imo) != 0) {
391 m_freem(m);
392 goto done;
393 }
394 }
395 }
396
397 /*
398 * Multicasts with a time-to-live of zero may be looped-
399 * back, above, but must not be transmitted on a network.
400 * Also, multicasts addressed to the loopback interface
401 * are not sent -- the above call to ip_mloopback() will
402 * loop back a copy if this host actually belongs to the
403 * destination group on the loopback interface.
404 */
405 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
406 m_freem(m);
407 goto done;
408 }
409
410 goto sendit;
411 }
412#ifndef notdef
413 /*
414 * If the source address is not specified yet, use the address
415 * of the outoing interface. In case, keep note we did that, so
416 * if the the firewall changes the next-hop causing the output
417 * interface to change, we can fix that.
418 */
419 if (ip->ip_src.s_addr == INADDR_ANY) {
420 /* Interface may have no addresses. */
421 if (ia != NULL) {
422 ip->ip_src = IA_SIN(ia)->sin_addr;
423 src_was_INADDR_ANY = 1;
424 }
425 }
426#endif /* notdef */
427 /*
428 * Verify that we have any chance at all of being able to queue
429 * the packet or packet fragments
430 */
431 if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
432 ifp->if_snd.ifq_maxlen) {
433 error = ENOBUFS;
434 ipstat.ips_odropped++;
435 goto bad;
436 }
437
438 /*
439 * Look for broadcast address and
440 * verify user is allowed to send
441 * such a packet.
442 */
443 if (isbroadcast) {
444 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
445 error = EADDRNOTAVAIL;
446 goto bad;
447 }
448 if ((flags & IP_ALLOWBROADCAST) == 0) {
449 error = EACCES;
450 goto bad;
451 }
452 /* don't allow broadcast messages to be fragmented */
453 if ((u_short)ip->ip_len > ifp->if_mtu) {
454 error = EMSGSIZE;
455 goto bad;
456 }
457 m->m_flags |= M_BCAST;
458 } else {
459 m->m_flags &= ~M_BCAST;
460 }
461
462sendit:
463#ifdef IPSEC
464 /* get SP for this packet */
465 if (so == NULL)
466 sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
467 else
468 sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
469
470 if (sp == NULL) {
471 ipsecstat.out_inval++;
472 goto bad;
473 }
474
475 error = 0;
476
477 /* check policy */
478 switch (sp->policy) {
479 case IPSEC_POLICY_DISCARD:
480 /*
481 * This packet is just discarded.
482 */
483 ipsecstat.out_polvio++;
484 goto bad;
485
486 case IPSEC_POLICY_BYPASS:
487 case IPSEC_POLICY_NONE:
488 /* no need to do IPsec. */
489 goto skip_ipsec;
490
491 case IPSEC_POLICY_IPSEC:
492 if (sp->req == NULL) {
493 /* acquire a policy */
494 error = key_spdacquire(sp);
495 goto bad;
496 }
497 break;
498
499 case IPSEC_POLICY_ENTRUST:
500 default:
501 printf("ip_output: Invalid policy found. %d\n", sp->policy);
502 }
503 {
504 struct ipsec_output_state state;
505 bzero(&state, sizeof(state));
506 state.m = m;
507 if (flags & IP_ROUTETOIF) {
508 state.ro = &iproute;
509 bzero(&iproute, sizeof(iproute));
510 } else
511 state.ro = ro;
512 state.dst = (struct sockaddr *)dst;
513
514 ip->ip_sum = 0;
515
516 /*
517 * XXX
518 * delayed checksums are not currently compatible with IPsec
519 */
520 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
521 in_delayed_cksum(m);
522 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
523 }
524
525 ip->ip_len = htons(ip->ip_len);
526 ip->ip_off = htons(ip->ip_off);
527
528 error = ipsec4_output(&state, sp, flags);
529
530 m = state.m;
531 if (flags & IP_ROUTETOIF) {
532 /*
533 * if we have tunnel mode SA, we may need to ignore
534 * IP_ROUTETOIF.
535 */
536 if (state.ro != &iproute || state.ro->ro_rt != NULL) {
537 flags &= ~IP_ROUTETOIF;
538 ro = state.ro;
539 }
540 } else
541 ro = state.ro;
542 dst = (struct sockaddr_in *)state.dst;
543 if (error) {
544 /* mbuf is already reclaimed in ipsec4_output. */
545 m0 = NULL;
546 switch (error) {
547 case EHOSTUNREACH:
548 case ENETUNREACH:
549 case EMSGSIZE:
550 case ENOBUFS:
551 case ENOMEM:
552 break;
553 default:
554 printf("ip4_output (ipsec): error code %d\n", error);
555 /*fall through*/
556 case ENOENT:
557 /* don't show these error codes to the user */
558 error = 0;
559 break;
560 }
561 goto bad;
562 }
563 }
564
565 /* be sure to update variables that are affected by ipsec4_output() */
566 ip = mtod(m, struct ip *);
567#ifdef _IP_VHL
568 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
569#else
570 hlen = ip->ip_hl << 2;
571#endif
572 if (ro->ro_rt == NULL) {
573 if ((flags & IP_ROUTETOIF) == 0) {
574 printf("ip_output: "
575 "can't update route after IPsec processing\n");
576 error = EHOSTUNREACH; /*XXX*/
577 goto bad;
578 }
579 } else {
580 ia = ifatoia(ro->ro_rt->rt_ifa);
581 ifp = ro->ro_rt->rt_ifp;
582 }
583
584 /* make it flipped, again. */
585 ip->ip_len = ntohs(ip->ip_len);
586 ip->ip_off = ntohs(ip->ip_off);
587skip_ipsec:
588#endif /*IPSEC*/
589#ifdef FAST_IPSEC
590 /*
591 * Check the security policy (SP) for the packet and, if
592 * required, do IPsec-related processing. There are two
593 * cases here; the first time a packet is sent through
594 * it will be untagged and handled by ipsec4_checkpolicy.
595 * If the packet is resubmitted to ip_output (e.g. after
596 * AH, ESP, etc. processing), there will be a tag to bypass
597 * the lookup and related policy checking.
598 */
599 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
600 s = splnet();
601 if (mtag != NULL) {
602 tdbi = (struct tdb_ident *)(mtag + 1);
603 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
604 if (sp == NULL)
605 error = -EINVAL; /* force silent drop */
606 m_tag_delete(m, mtag);
607 } else {
608 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags,
609 &error, inp);
610 }
611 /*
612 * There are four return cases:
613 * sp != NULL apply IPsec policy
614 * sp == NULL, error == 0 no IPsec handling needed
615 * sp == NULL, error == -EINVAL discard packet w/o error
616 * sp == NULL, error != 0 discard packet, report error
617 */
618 if (sp != NULL) {
619 /* Loop detection, check if ipsec processing already done */
620 KASSERT(sp->req != NULL, ("ip_output: no ipsec request"));
621 for (mtag = m_tag_first(m); mtag != NULL;
622 mtag = m_tag_next(m, mtag)) {
623 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
624 continue;
625 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
626 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
627 continue;
628 /*
629 * Check if policy has an SA associated with it.
630 * This can happen when an SP has yet to acquire
631 * an SA; e.g. on first reference. If it occurs,
632 * then we let ipsec4_process_packet do its thing.
633 */
634 if (sp->req->sav == NULL)
635 break;
636 tdbi = (struct tdb_ident *)(mtag + 1);
637 if (tdbi->spi == sp->req->sav->spi &&
638 tdbi->proto == sp->req->sav->sah->saidx.proto &&
639 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst,
640 sizeof (union sockaddr_union)) == 0) {
641 /*
642 * No IPsec processing is needed, free
643 * reference to SP.
644 *
645 * NB: null pointer to avoid free at
646 * done: below.
647 */
648 KEY_FREESP(&sp), sp = NULL;
649 splx(s);
650 goto spd_done;
651 }
652 }
653
654 /*
655 * Do delayed checksums now because we send before
656 * this is done in the normal processing path.
657 */
658 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
659 in_delayed_cksum(m);
660 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
661 }
662
663 ip->ip_len = htons(ip->ip_len);
664 ip->ip_off = htons(ip->ip_off);
665
666 /* NB: callee frees mbuf */
667 error = ipsec4_process_packet(m, sp->req, flags, 0);
668 /*
669 * Preserve KAME behaviour: ENOENT can be returned
670 * when an SA acquire is in progress. Don't propagate
671 * this to user-level; it confuses applications.
672 *
673 * XXX this will go away when the SADB is redone.
674 */
675 if (error == ENOENT)
676 error = 0;
677 splx(s);
678 goto done;
679 } else {
680 splx(s);
681
682 if (error != 0) {
683 /*
684 * Hack: -EINVAL is used to signal that a packet
685 * should be silently discarded. This is typically
686 * because we asked key management for an SA and
687 * it was delayed (e.g. kicked up to IKE).
688 */
689 if (error == -EINVAL)
690 error = 0;
691 goto bad;
692 } else {
693 /* No IPsec processing for this packet. */
694 }
695#ifdef notyet
696 /*
697 * If deferred crypto processing is needed, check that
698 * the interface supports it.
699 */
700 mtag = m_tag_find(m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL);
701 if (mtag != NULL && (ifp->if_capenable & IFCAP_IPSEC) == 0) {
702 /* notify IPsec to do its own crypto */
703 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1));
704 error = EHOSTUNREACH;
705 goto bad;
706 }
707#endif
708 }
709spd_done:
710#endif /* FAST_IPSEC */
711 /*
712 * IpHack's section.
713 * - Xlate: translate packet's addr/port (NAT).
714 * - Firewall: deny/allow/etc.
715 * - Wrap: fake packet's addr/port <unimpl.>
716 * - Encapsulate: put it in another IP and send out. <unimp.>
717 */
718 if (fr_checkp) {
719 struct mbuf *m1 = m;
720
721 if ((error = (*fr_checkp)(ip, hlen, ifp, 1, &m1)) || !m1)
722 goto done;
723 ip = mtod(m = m1, struct ip *);
724 }
725
726 /*
727 * Check with the firewall...
728 * but not if we are already being fwd'd from a firewall.
729 */
730 if (fw_enable && IPFW_LOADED && !args.next_hop) {
731 struct sockaddr_in *old = dst;
732
733 args.m = m;
734 args.next_hop = dst;
735 args.oif = ifp;
736 off = ip_fw_chk_ptr(&args);
737 m = args.m;
738 dst = args.next_hop;
739
740 /*
741 * On return we must do the following:
742 * m == NULL -> drop the pkt (old interface, deprecated)
743 * (off & IP_FW_PORT_DENY_FLAG) -> drop the pkt (new interface)
744 * 1<=off<= 0xffff -> DIVERT
745 * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe
746 * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet
747 * dst != old -> IPFIREWALL_FORWARD
748 * off==0, dst==old -> accept
749 * If some of the above modules are not compiled in, then
750 * we should't have to check the corresponding condition
751 * (because the ipfw control socket should not accept
752 * unsupported rules), but better play safe and drop
753 * packets in case of doubt.
754 */
755 if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) {
756 if (m)
757 m_freem(m);
758 error = EACCES;
759 goto done;
760 }
761 ip = mtod(m, struct ip *);
762 if (off == 0 && dst == old) /* common case */
763 goto pass;
764 if (DUMMYNET_LOADED && (off & IP_FW_PORT_DYNT_FLAG) != 0) {
765 /*
766 * pass the pkt to dummynet. Need to include
767 * pipe number, m, ifp, ro, dst because these are
768 * not recomputed in the next pass.
769 * All other parameters have been already used and
770 * so they are not needed anymore.
771 * XXX note: if the ifp or ro entry are deleted
772 * while a pkt is in dummynet, we are in trouble!
773 */
774 args.ro = ro;
775 args.dst = dst;
776 args.flags = flags;
777
778 error = ip_dn_io_ptr(m, off & 0xffff, DN_TO_IP_OUT,
779 &args);
780 goto done;
781 }
782#ifdef IPDIVERT
783 if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) {
784 struct mbuf *clone = NULL;
785
786 /* Clone packet if we're doing a 'tee' */
787 if ((off & IP_FW_PORT_TEE_FLAG) != 0)
788 clone = m_dup(m, M_DONTWAIT);
789
790 /*
791 * XXX
792 * delayed checksums are not currently compatible
793 * with divert sockets.
794 */
795 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
796 in_delayed_cksum(m);
797 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
798 }
799
800 /* Restore packet header fields to original values */
801 ip->ip_len = htons(ip->ip_len);
802 ip->ip_off = htons(ip->ip_off);
803
804 /* Deliver packet to divert input routine */
805 divert_packet(m, 0, off & 0xffff, args.divert_rule);
806
807 /* If 'tee', continue with original packet */
808 if (clone != NULL) {
809 m = clone;
810 ip = mtod(m, struct ip *);
811 goto pass;
812 }
813 goto done;
814 }
815#endif
816
817 /* IPFIREWALL_FORWARD */
818 /*
819 * Check dst to make sure it is directly reachable on the
820 * interface we previously thought it was.
821 * If it isn't (which may be likely in some situations) we have
822 * to re-route it (ie, find a route for the next-hop and the
823 * associated interface) and set them here. This is nested
824 * forwarding which in most cases is undesirable, except where
825 * such control is nigh impossible. So we do it here.
826 * And I'm babbling.
827 */
828 if (off == 0 && old != dst) { /* FORWARD, dst has changed */
829#if 0
830 /*
831 * XXX To improve readability, this block should be
832 * changed into a function call as below:
833 */
834 error = ip_ipforward(&m, &dst, &ifp);
835 if (error)
836 goto bad;
837 if (m == NULL) /* ip_input consumed the mbuf */
838 goto done;
839#else
840 struct in_ifaddr *ia;
841
842 /*
843 * XXX sro_fwd below is static, and a pointer
844 * to it gets passed to routines downstream.
845 * This could have surprisingly bad results in
846 * practice, because its content is overwritten
847 * by subsequent packets.
848 */
849 /* There must be a better way to do this next line... */
850 static struct route sro_fwd;
851 struct route *ro_fwd = &sro_fwd;
852
853#if 0
854 print_ip("IPFIREWALL_FORWARD: New dst ip: ",
855 dst->sin_addr, "\n");
856#endif
857
858 /*
859 * We need to figure out if we have been forwarded
860 * to a local socket. If so, then we should somehow
861 * "loop back" to ip_input, and get directed to the
862 * PCB as if we had received this packet. This is
863 * because it may be dificult to identify the packets
864 * you want to forward until they are being output
865 * and have selected an interface. (e.g. locally
866 * initiated packets) If we used the loopback inteface,
867 * we would not be able to control what happens
868 * as the packet runs through ip_input() as
869 * it is done through a ISR.
870 */
871 LIST_FOREACH(ia,
872 INADDR_HASH(dst->sin_addr.s_addr), ia_hash) {
873 /*
874 * If the addr to forward to is one
875 * of ours, we pretend to
876 * be the destination for this packet.
877 */
878 if (IA_SIN(ia)->sin_addr.s_addr ==
879 dst->sin_addr.s_addr)
880 break;
881 }
882 if (ia) { /* tell ip_input "dont filter" */
883 struct m_hdr tag;
884
885 tag.mh_type = MT_TAG;
886 tag.mh_flags = PACKET_TAG_IPFORWARD;
887 tag.mh_data = (caddr_t)args.next_hop;
888 tag.mh_next = m;
889
890 if (m->m_pkthdr.rcvif == NULL)
891 m->m_pkthdr.rcvif = ifunit("lo0");
892 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
893 m->m_pkthdr.csum_flags |=
894 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
895 m0->m_pkthdr.csum_data = 0xffff;
896 }
897 m->m_pkthdr.csum_flags |=
898 CSUM_IP_CHECKED | CSUM_IP_VALID;
899 ip->ip_len = htons(ip->ip_len);
900 ip->ip_off = htons(ip->ip_off);
901 ip_input((struct mbuf *)&tag);
902 goto done;
903 }
904 /* Some of the logic for this was
905 * nicked from above.
906 *
907 * This rewrites the cached route in a local PCB.
908 * Is this what we want to do?
909 */
910 bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
911
912 ro_fwd->ro_rt = 0;
913 rtalloc_ign(ro_fwd, RTF_PRCLONING);
914
915 if (ro_fwd->ro_rt == 0) {
916 ipstat.ips_noroute++;
917 error = EHOSTUNREACH;
918 goto bad;
919 }
920
921 ia = ifatoia(ro_fwd->ro_rt->rt_ifa);
922 ifp = ro_fwd->ro_rt->rt_ifp;
923 ro_fwd->ro_rt->rt_use++;
924 if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY)
925 dst = (struct sockaddr_in *)
926 ro_fwd->ro_rt->rt_gateway;
927 if (ro_fwd->ro_rt->rt_flags & RTF_HOST)
928 isbroadcast =
929 (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
930 else
931 isbroadcast = in_broadcast(dst->sin_addr, ifp);
932 if (ro->ro_rt)
933 RTFREE(ro->ro_rt);
934 ro->ro_rt = ro_fwd->ro_rt;
935 dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
936
937#endif /* ... block to be put into a function */
938 /*
939 * If we added a default src ip earlier,
940 * which would have been gotten from the-then
941 * interface, do it again, from the new one.
942 */
943 if (src_was_INADDR_ANY)
944 ip->ip_src = IA_SIN(ia)->sin_addr;
945 goto pass ;
946 }
947
948 /*
949 * if we get here, none of the above matches, and
950 * we have to drop the pkt
951 */
952 m_freem(m);
953 error = EACCES; /* not sure this is the right error msg */
954 goto done;
955 }
956
957pass:
958 /* 127/8 must not appear on wire - RFC1122. */
959 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
960 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
961 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
962 ipstat.ips_badaddr++;
963 error = EADDRNOTAVAIL;
964 goto bad;
965 }
966 }
967
968 m->m_pkthdr.csum_flags |= CSUM_IP;
969 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
970 if (sw_csum & CSUM_DELAY_DATA) {
971 in_delayed_cksum(m);
972 sw_csum &= ~CSUM_DELAY_DATA;
973 }
974 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
975
976 /*
977 * If small enough for interface, or the interface will take
978 * care of the fragmentation for us, can just send directly.
979 */
980 if ((u_short)ip->ip_len <= ifp->if_mtu ||
981 ifp->if_hwassist & CSUM_FRAGMENT) {
982 ip->ip_len = htons(ip->ip_len);
983 ip->ip_off = htons(ip->ip_off);
984 ip->ip_sum = 0;
985 if (sw_csum & CSUM_DELAY_IP) {
986 if (ip->ip_vhl == IP_VHL_BORING) {
987 ip->ip_sum = in_cksum_hdr(ip);
988 } else {
989 ip->ip_sum = in_cksum(m, hlen);
990 }
991 }
992
993 /* Record statistics for this interface address. */
994 if (!(flags & IP_FORWARDING) && ia) {
995 ia->ia_ifa.if_opackets++;
996 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
997 }
998
999#ifdef IPSEC
1000 /* clean ipsec history once it goes out of the node */
1001 ipsec_delaux(m);
1002#endif
1003
1004#ifdef MBUF_STRESS_TEST
1005 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) {
1006 struct mbuf *m1, *m2;
1007 int length, tmp;
1008
1009 tmp = length = m->m_pkthdr.len;
1010
1011 while ((length -= mbuf_frag_size) >= 1) {
1012 m1 = m_split(m, length, M_DONTWAIT);
1013 if (m1 == NULL)
1014 break;
1015 m1->m_flags &= ~M_PKTHDR;
1016 m2 = m;
1017 while (m2->m_next != NULL)
1018 m2 = m2->m_next;
1019 m2->m_next = m1;
1020 }
1021 m->m_pkthdr.len = tmp;
1022 }
1023#endif
1024 error = (*ifp->if_output)(ifp, m,
1025 (struct sockaddr *)dst, ro->ro_rt);
1026 goto done;
1027 }
1028 /*
1029 * Too large for interface; fragment if possible.
1030 * Must be able to put at least 8 bytes per fragment.
1031 */
1032 if (ip->ip_off & IP_DF) {
1033 error = EMSGSIZE;
1034 /*
1035 * This case can happen if the user changed the MTU
1036 * of an interface after enabling IP on it. Because
1037 * most netifs don't keep track of routes pointing to
1038 * them, there is no way for one to update all its
1039 * routes when the MTU is changed.
1040 */
1041 if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST))
1042 && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
1043 && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
1044 ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
1045 }
1046 ipstat.ips_cantfrag++;
1047 goto bad;
1048 }
1049 len = (ifp->if_mtu - hlen) &~ 7;
1050 if (len < 8) {
1051 error = EMSGSIZE;
1052 goto bad;
1053 }
1054
1055 /*
1056 * if the interface will not calculate checksums on
1057 * fragmented packets, then do it here.
1058 */
1059 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA &&
1060 (ifp->if_hwassist & CSUM_IP_FRAGS) == 0) {
1061 in_delayed_cksum(m);
1062 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1063 }
1064
1065 {
1066 int mhlen, firstlen = len;
1067 struct mbuf **mnext = &m->m_nextpkt;
1068 int nfrags = 1;
1069
1070 /*
1071 * Loop through length of segment after first fragment,
1072 * make new header and copy data of each part and link onto chain.
1073 */
1074 m0 = m;
1075 mhlen = sizeof (struct ip);
1076 for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
1077 MGETHDR(m, M_DONTWAIT, MT_HEADER);
1078 if (m == 0) {
1079 error = ENOBUFS;
1080 ipstat.ips_odropped++;
1081 goto sendorfree;
1082 }
1083 m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
1084 m->m_data += max_linkhdr;
1085 mhip = mtod(m, struct ip *);
1086 *mhip = *ip;
1087 if (hlen > sizeof (struct ip)) {
1088 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
1089 mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
1090 }
1091 m->m_len = mhlen;
1092 mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off;
1093 if (off + len >= (u_short)ip->ip_len)
1094 len = (u_short)ip->ip_len - off;
1095 else
1096 mhip->ip_off |= IP_MF;
1097 mhip->ip_len = htons((u_short)(len + mhlen));
1098 m->m_next = m_copy(m0, off, len);
1099 if (m->m_next == 0) {
1100 (void) m_free(m);
1101 error = ENOBUFS; /* ??? */
1102 ipstat.ips_odropped++;
1103 goto sendorfree;
1104 }
1105 m->m_pkthdr.len = mhlen + len;
1106 m->m_pkthdr.rcvif = (struct ifnet *)0;
1107 m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
1108 mhip->ip_off = htons(mhip->ip_off);
1109 mhip->ip_sum = 0;
1110 if (sw_csum & CSUM_DELAY_IP) {
1111 if (mhip->ip_vhl == IP_VHL_BORING) {
1112 mhip->ip_sum = in_cksum_hdr(mhip);
1113 } else {
1114 mhip->ip_sum = in_cksum(m, mhlen);
1115 }
1116 }
1117 *mnext = m;
1118 mnext = &m->m_nextpkt;
1119 nfrags++;
1120 }
1121 ipstat.ips_ofragments += nfrags;
1122
1123 /* set first/last markers for fragment chain */
1124 m->m_flags |= M_LASTFRAG;
1125 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
1126 m0->m_pkthdr.csum_data = nfrags;
1127
1128 /*
1129 * Update first fragment by trimming what's been copied out
1130 * and updating header, then send each fragment (in order).
1131 */
1132 m = m0;
1133 m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
1134 m->m_pkthdr.len = hlen + firstlen;
1135 ip->ip_len = htons((u_short)m->m_pkthdr.len);
1136 ip->ip_off |= IP_MF;
1137 ip->ip_off = htons(ip->ip_off);
1138 ip->ip_sum = 0;
1139 if (sw_csum & CSUM_DELAY_IP) {
1140 if (ip->ip_vhl == IP_VHL_BORING) {
1141 ip->ip_sum = in_cksum_hdr(ip);
1142 } else {
1143 ip->ip_sum = in_cksum(m, hlen);
1144 }
1145 }
1146sendorfree:
1147 for (m = m0; m; m = m0) {
1148 m0 = m->m_nextpkt;
1149 m->m_nextpkt = 0;
1150#ifdef IPSEC
1151 /* clean ipsec history once it goes out of the node */
1152 ipsec_delaux(m);
1153#endif
1154 if (error == 0) {
1155 /* Record statistics for this interface address. */
1156 if (ia != NULL) {
1157 ia->ia_ifa.if_opackets++;
1158 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
1159 }
1160
1161 error = (*ifp->if_output)(ifp, m,
1162 (struct sockaddr *)dst, ro->ro_rt);
1163 } else
1164 m_freem(m);
1165 }
1166
1167 if (error == 0)
1168 ipstat.ips_fragmented++;
1169 }
1170done:
1171#ifdef IPSEC
1172 if (ro == &iproute && ro->ro_rt) {
1173 RTFREE(ro->ro_rt);
1174 ro->ro_rt = NULL;
1175 }
1176 if (sp != NULL) {
1177 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1178 printf("DP ip_output call free SP:%p\n", sp));
1179 key_freesp(sp);
1180 }
1181#endif /* IPSEC */
1182#ifdef FAST_IPSEC
1183 if (ro == &iproute && ro->ro_rt) {
1184 RTFREE(ro->ro_rt);
1185 ro->ro_rt = NULL;
1186 }
1187 if (sp != NULL)
1188 KEY_FREESP(&sp);
1189#endif /* FAST_IPSEC */
1190 return (error);
1191bad:
1192 m_freem(m);
1193 goto done;
1194}
1195
1196void
1197in_delayed_cksum(struct mbuf *m)
1198{
1199 struct ip *ip;
1200 u_short csum, offset;
1201
1202 ip = mtod(m, struct ip *);
1203 offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
1204 csum = in_cksum_skip(m, ip->ip_len, offset);
1205 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
1206 csum = 0xffff;
1207 offset += m->m_pkthdr.csum_data; /* checksum offset */
1208
1209 if (offset + sizeof(u_short) > m->m_len) {
1210 printf("delayed m_pullup, m->len: %d off: %d p: %d\n",
1211 m->m_len, offset, ip->ip_p);
1212 /*
1213 * XXX
1214 * this shouldn't happen, but if it does, the
1215 * correct behavior may be to insert the checksum
1216 * in the existing chain instead of rearranging it.
1217 */
1218 m = m_pullup(m, offset + sizeof(u_short));
1219 }
1220 *(u_short *)(m->m_data + offset) = csum;
1221}
1222
1223/*
1224 * Insert IP options into preformed packet.
1225 * Adjust IP destination as required for IP source routing,
1226 * as indicated by a non-zero in_addr at the start of the options.
1227 *
1228 * XXX This routine assumes that the packet has no options in place.
1229 */
1230static struct mbuf *
1231ip_insertoptions(m, opt, phlen)
1232 register struct mbuf *m;
1233 struct mbuf *opt;
1234 int *phlen;
1235{
1236 register struct ipoption *p = mtod(opt, struct ipoption *);
1237 struct mbuf *n;
1238 register struct ip *ip = mtod(m, struct ip *);
1239 unsigned optlen;
1240
1241 optlen = opt->m_len - sizeof(p->ipopt_dst);
1242 if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) {
1243 *phlen = 0;
1244 return (m); /* XXX should fail */
1245 }
1246 if (p->ipopt_dst.s_addr)
1247 ip->ip_dst = p->ipopt_dst;
1248 if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
1249 MGETHDR(n, M_DONTWAIT, MT_HEADER);
1250 if (n == 0) {
1251 *phlen = 0;
1252 return (m);
1253 }
1254 n->m_pkthdr.rcvif = (struct ifnet *)0;
1255 n->m_pkthdr.len = m->m_pkthdr.len + optlen;
1256 m->m_len -= sizeof(struct ip);
1257 m->m_data += sizeof(struct ip);
1258 n->m_next = m;
1259 m = n;
1260 m->m_len = optlen + sizeof(struct ip);
1261 m->m_data += max_linkhdr;
1262 (void)memcpy(mtod(m, void *), ip, sizeof(struct ip));
1263 } else {
1264 m->m_data -= optlen;
1265 m->m_len += optlen;
1266 m->m_pkthdr.len += optlen;
1267 ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
1268 }
1269 ip = mtod(m, struct ip *);
1270 bcopy(p->ipopt_list, ip + 1, optlen);
1271 *phlen = sizeof(struct ip) + optlen;
1272 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
1273 ip->ip_len += optlen;
1274 return (m);
1275}
1276
1277/*
1278 * Copy options from ip to jp,
1279 * omitting those not copied during fragmentation.
1280 */
1281int
1282ip_optcopy(ip, jp)
1283 struct ip *ip, *jp;
1284{
1285 register u_char *cp, *dp;
1286 int opt, optlen, cnt;
1287
1288 cp = (u_char *)(ip + 1);
1289 dp = (u_char *)(jp + 1);
1290 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
1291 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1292 opt = cp[0];
1293 if (opt == IPOPT_EOL)
1294 break;
1295 if (opt == IPOPT_NOP) {
1296 /* Preserve for IP mcast tunnel's LSRR alignment. */
1297 *dp++ = IPOPT_NOP;
1298 optlen = 1;
1299 continue;
1300 }
1301
1302 KASSERT(cnt >= IPOPT_OLEN + sizeof(*cp),
1303 ("ip_optcopy: malformed ipv4 option"));
1304 optlen = cp[IPOPT_OLEN];
1305 KASSERT(optlen >= IPOPT_OLEN + sizeof(*cp) && optlen <= cnt,
1306 ("ip_optcopy: malformed ipv4 option"));
1307
1308 /* bogus lengths should have been caught by ip_dooptions */
1309 if (optlen > cnt)
1310 optlen = cnt;
1311 if (IPOPT_COPIED(opt)) {
1312 bcopy(cp, dp, optlen);
1313 dp += optlen;
1314 }
1315 }
1316 for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
1317 *dp++ = IPOPT_EOL;
1318 return (optlen);
1319}
1320
1321/*
1322 * IP socket option processing.
1323 */
1324int
1325ip_ctloutput(so, sopt)
1326 struct socket *so;
1327 struct sockopt *sopt;
1328{
1329 struct inpcb *inp = sotoinpcb(so);
1330 int error, optval;
1331
1332 error = optval = 0;
1333 if (sopt->sopt_level != IPPROTO_IP) {
1334 return (EINVAL);
1335 }
1336
1337 switch (sopt->sopt_dir) {
1338 case SOPT_SET:
1339 switch (sopt->sopt_name) {
1340 case IP_OPTIONS:
1341#ifdef notyet
1342 case IP_RETOPTS:
1343#endif
1344 {
1345 struct mbuf *m;
1346 if (sopt->sopt_valsize > MLEN) {
1347 error = EMSGSIZE;
1348 break;
1349 }
dadab5e9 1350 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_HEADER);
984263bc
MD
1351 if (m == 0) {
1352 error = ENOBUFS;
1353 break;
1354 }
1355 m->m_len = sopt->sopt_valsize;
1356 error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1357 m->m_len);
1358
1359 return (ip_pcbopts(sopt->sopt_name, &inp->inp_options,
1360 m));
1361 }
1362
1363 case IP_TOS:
1364 case IP_TTL:
1365 case IP_RECVOPTS:
1366 case IP_RECVRETOPTS:
1367 case IP_RECVDSTADDR:
1368 case IP_RECVIF:
1369 case IP_FAITH:
1370 error = sooptcopyin(sopt, &optval, sizeof optval,
1371 sizeof optval);
1372 if (error)
1373 break;
1374
1375 switch (sopt->sopt_name) {
1376 case IP_TOS:
1377 inp->inp_ip_tos = optval;
1378 break;
1379
1380 case IP_TTL:
1381 inp->inp_ip_ttl = optval;
1382 break;
1383#define OPTSET(bit) \
1384 if (optval) \
1385 inp->inp_flags |= bit; \
1386 else \
1387 inp->inp_flags &= ~bit;
1388
1389 case IP_RECVOPTS:
1390 OPTSET(INP_RECVOPTS);
1391 break;
1392
1393 case IP_RECVRETOPTS:
1394 OPTSET(INP_RECVRETOPTS);
1395 break;
1396
1397 case IP_RECVDSTADDR:
1398 OPTSET(INP_RECVDSTADDR);
1399 break;
1400
1401 case IP_RECVIF:
1402 OPTSET(INP_RECVIF);
1403 break;
1404
1405 case IP_FAITH:
1406 OPTSET(INP_FAITH);
1407 break;
1408 }
1409 break;
1410#undef OPTSET
1411
1412 case IP_MULTICAST_IF:
1413 case IP_MULTICAST_VIF:
1414 case IP_MULTICAST_TTL:
1415 case IP_MULTICAST_LOOP:
1416 case IP_ADD_MEMBERSHIP:
1417 case IP_DROP_MEMBERSHIP:
1418 error = ip_setmoptions(sopt, &inp->inp_moptions);
1419 break;
1420
1421 case IP_PORTRANGE:
1422 error = sooptcopyin(sopt, &optval, sizeof optval,
1423 sizeof optval);
1424 if (error)
1425 break;
1426
1427 switch (optval) {
1428 case IP_PORTRANGE_DEFAULT:
1429 inp->inp_flags &= ~(INP_LOWPORT);
1430 inp->inp_flags &= ~(INP_HIGHPORT);
1431 break;
1432
1433 case IP_PORTRANGE_HIGH:
1434 inp->inp_flags &= ~(INP_LOWPORT);
1435 inp->inp_flags |= INP_HIGHPORT;
1436 break;
1437
1438 case IP_PORTRANGE_LOW:
1439 inp->inp_flags &= ~(INP_HIGHPORT);
1440 inp->inp_flags |= INP_LOWPORT;
1441 break;
1442
1443 default:
1444 error = EINVAL;
1445 break;
1446 }
1447 break;
1448
1449#if defined(IPSEC) || defined(FAST_IPSEC)
1450 case IP_IPSEC_POLICY:
1451 {
1452 caddr_t req;
1453 size_t len = 0;
1454 int priv;
1455 struct mbuf *m;
1456 int optname;
1457
1458 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1459 break;
1460 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1461 break;
1462 priv = (sopt->sopt_p != NULL &&
dadab5e9 1463 suser(sopt->sopt_p->p_thread) != 0) ? 0 : 1;
984263bc
MD
1464 req = mtod(m, caddr_t);
1465 len = m->m_len;
1466 optname = sopt->sopt_name;
1467 error = ipsec4_set_policy(inp, optname, req, len, priv);
1468 m_freem(m);
1469 break;
1470 }
1471#endif /*IPSEC*/
1472
1473 default:
1474 error = ENOPROTOOPT;
1475 break;
1476 }
1477 break;
1478
1479 case SOPT_GET:
1480 switch (sopt->sopt_name) {
1481 case IP_OPTIONS:
1482 case IP_RETOPTS:
1483 if (inp->inp_options)
1484 error = sooptcopyout(sopt,
1485 mtod(inp->inp_options,
1486 char *),
1487 inp->inp_options->m_len);
1488 else
1489 sopt->sopt_valsize = 0;
1490 break;
1491
1492 case IP_TOS:
1493 case IP_TTL:
1494 case IP_RECVOPTS:
1495 case IP_RECVRETOPTS:
1496 case IP_RECVDSTADDR:
1497 case IP_RECVIF:
1498 case IP_PORTRANGE:
1499 case IP_FAITH:
1500 switch (sopt->sopt_name) {
1501
1502 case IP_TOS:
1503 optval = inp->inp_ip_tos;
1504 break;
1505
1506 case IP_TTL:
1507 optval = inp->inp_ip_ttl;
1508 break;
1509
1510#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
1511
1512 case IP_RECVOPTS:
1513 optval = OPTBIT(INP_RECVOPTS);
1514 break;
1515
1516 case IP_RECVRETOPTS:
1517 optval = OPTBIT(INP_RECVRETOPTS);
1518 break;
1519
1520 case IP_RECVDSTADDR:
1521 optval = OPTBIT(INP_RECVDSTADDR);
1522 break;
1523
1524 case IP_RECVIF:
1525 optval = OPTBIT(INP_RECVIF);
1526 break;
1527
1528 case IP_PORTRANGE:
1529 if (inp->inp_flags & INP_HIGHPORT)
1530 optval = IP_PORTRANGE_HIGH;
1531 else if (inp->inp_flags & INP_LOWPORT)
1532 optval = IP_PORTRANGE_LOW;
1533 else
1534 optval = 0;
1535 break;
1536
1537 case IP_FAITH:
1538 optval = OPTBIT(INP_FAITH);
1539 break;
1540 }
1541 error = sooptcopyout(sopt, &optval, sizeof optval);
1542 break;
1543
1544 case IP_MULTICAST_IF:
1545 case IP_MULTICAST_VIF:
1546 case IP_MULTICAST_TTL:
1547 case IP_MULTICAST_LOOP:
1548 case IP_ADD_MEMBERSHIP:
1549 case IP_DROP_MEMBERSHIP:
1550 error = ip_getmoptions(sopt, inp->inp_moptions);
1551 break;
1552
1553#if defined(IPSEC) || defined(FAST_IPSEC)
1554 case IP_IPSEC_POLICY:
1555 {
1556 struct mbuf *m = NULL;
1557 caddr_t req = NULL;
1558 size_t len = 0;
1559
1560 if (m != 0) {
1561 req = mtod(m, caddr_t);
1562 len = m->m_len;
1563 }
1564 error = ipsec4_get_policy(sotoinpcb(so), req, len, &m);
1565 if (error == 0)
1566 error = soopt_mcopyout(sopt, m); /* XXX */
1567 if (error == 0)
1568 m_freem(m);
1569 break;
1570 }
1571#endif /*IPSEC*/
1572
1573 default:
1574 error = ENOPROTOOPT;
1575 break;
1576 }
1577 break;
1578 }
1579 return (error);
1580}
1581
1582/*
1583 * Set up IP options in pcb for insertion in output packets.
1584 * Store in mbuf with pointer in pcbopt, adding pseudo-option
1585 * with destination address if source routed.
1586 */
1587static int
1588ip_pcbopts(optname, pcbopt, m)
1589 int optname;
1590 struct mbuf **pcbopt;
1591 register struct mbuf *m;
1592{
1593 register int cnt, optlen;
1594 register u_char *cp;
1595 u_char opt;
1596
1597 /* turn off any old options */
1598 if (*pcbopt)
1599 (void)m_free(*pcbopt);
1600 *pcbopt = 0;
1601 if (m == (struct mbuf *)0 || m->m_len == 0) {
1602 /*
1603 * Only turning off any previous options.
1604 */
1605 if (m)
1606 (void)m_free(m);
1607 return (0);
1608 }
1609
1610 if (m->m_len % sizeof(int32_t))
1611 goto bad;
1612 /*
1613 * IP first-hop destination address will be stored before
1614 * actual options; move other options back
1615 * and clear it when none present.
1616 */
1617 if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
1618 goto bad;
1619 cnt = m->m_len;
1620 m->m_len += sizeof(struct in_addr);
1621 cp = mtod(m, u_char *) + sizeof(struct in_addr);
1622 ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt);
1623 bzero(mtod(m, caddr_t), sizeof(struct in_addr));
1624
1625 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1626 opt = cp[IPOPT_OPTVAL];
1627 if (opt == IPOPT_EOL)
1628 break;
1629 if (opt == IPOPT_NOP)
1630 optlen = 1;
1631 else {
1632 if (cnt < IPOPT_OLEN + sizeof(*cp))
1633 goto bad;
1634 optlen = cp[IPOPT_OLEN];
1635 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
1636 goto bad;
1637 }
1638 switch (opt) {
1639
1640 default:
1641 break;
1642
1643 case IPOPT_LSRR:
1644 case IPOPT_SSRR:
1645 /*
1646 * user process specifies route as:
1647 * ->A->B->C->D
1648 * D must be our final destination (but we can't
1649 * check that since we may not have connected yet).
1650 * A is first hop destination, which doesn't appear in
1651 * actual IP option, but is stored before the options.
1652 */
1653 if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
1654 goto bad;
1655 m->m_len -= sizeof(struct in_addr);
1656 cnt -= sizeof(struct in_addr);
1657 optlen -= sizeof(struct in_addr);
1658 cp[IPOPT_OLEN] = optlen;
1659 /*
1660 * Move first hop before start of options.
1661 */
1662 bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
1663 sizeof(struct in_addr));
1664 /*
1665 * Then copy rest of options back
1666 * to close up the deleted entry.
1667 */
1668 ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] +
1669 sizeof(struct in_addr)),
1670 (caddr_t)&cp[IPOPT_OFFSET+1],
1671 (unsigned)cnt + sizeof(struct in_addr));
1672 break;
1673 }
1674 }
1675 if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
1676 goto bad;
1677 *pcbopt = m;
1678 return (0);
1679
1680bad:
1681 (void)m_free(m);
1682 return (EINVAL);
1683}
1684
1685/*
1686 * XXX
1687 * The whole multicast option thing needs to be re-thought.
1688 * Several of these options are equally applicable to non-multicast
1689 * transmission, and one (IP_MULTICAST_TTL) totally duplicates a
1690 * standard option (IP_TTL).
1691 */
1692
1693/*
1694 * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index.
1695 */
1696static struct ifnet *
1697ip_multicast_if(a, ifindexp)
1698 struct in_addr *a;
1699 int *ifindexp;
1700{
1701 int ifindex;
1702 struct ifnet *ifp;
1703
1704 if (ifindexp)
1705 *ifindexp = 0;
1706 if (ntohl(a->s_addr) >> 24 == 0) {
1707 ifindex = ntohl(a->s_addr) & 0xffffff;
1708 if (ifindex < 0 || if_index < ifindex)
1709 return NULL;
1710 ifp = ifindex2ifnet[ifindex];
1711 if (ifindexp)
1712 *ifindexp = ifindex;
1713 } else {
1714 INADDR_TO_IFP(*a, ifp);
1715 }
1716 return ifp;
1717}
1718
1719/*
1720 * Set the IP multicast options in response to user setsockopt().
1721 */
1722static int
1723ip_setmoptions(sopt, imop)
1724 struct sockopt *sopt;
1725 struct ip_moptions **imop;
1726{
1727 int error = 0;
1728 int i;
1729 struct in_addr addr;
1730 struct ip_mreq mreq;
1731 struct ifnet *ifp;
1732 struct ip_moptions *imo = *imop;
1733 struct route ro;
1734 struct sockaddr_in *dst;
1735 int ifindex;
1736 int s;
1737
1738 if (imo == NULL) {
1739 /*
1740 * No multicast option buffer attached to the pcb;
1741 * allocate one and initialize to default values.
1742 */
1743 imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS,
1744 M_WAITOK);
1745
1746 if (imo == NULL)
1747 return (ENOBUFS);
1748 *imop = imo;
1749 imo->imo_multicast_ifp = NULL;
1750 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1751 imo->imo_multicast_vif = -1;
1752 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
1753 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
1754 imo->imo_num_memberships = 0;
1755 }
1756
1757 switch (sopt->sopt_name) {
1758 /* store an index number for the vif you wanna use in the send */
1759 case IP_MULTICAST_VIF:
1760 if (legal_vif_num == 0) {
1761 error = EOPNOTSUPP;
1762 break;
1763 }
1764 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
1765 if (error)
1766 break;
1767 if (!legal_vif_num(i) && (i != -1)) {
1768 error = EINVAL;
1769 break;
1770 }
1771 imo->imo_multicast_vif = i;
1772 break;
1773
1774 case IP_MULTICAST_IF:
1775 /*
1776 * Select the interface for outgoing multicast packets.
1777 */
1778 error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr);
1779 if (error)
1780 break;
1781 /*
1782 * INADDR_ANY is used to remove a previous selection.
1783 * When no interface is selected, a default one is
1784 * chosen every time a multicast packet is sent.
1785 */
1786 if (addr.s_addr == INADDR_ANY) {
1787 imo->imo_multicast_ifp = NULL;
1788 break;
1789 }
1790 /*
1791 * The selected interface is identified by its local
1792 * IP address. Find the interface and confirm that
1793 * it supports multicasting.
1794 */
1795 s = splimp();
1796 ifp = ip_multicast_if(&addr, &ifindex);
1797 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
1798 splx(s);
1799 error = EADDRNOTAVAIL;
1800 break;
1801 }
1802 imo->imo_multicast_ifp = ifp;
1803 if (ifindex)
1804 imo->imo_multicast_addr = addr;
1805 else
1806 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1807 splx(s);
1808 break;
1809
1810 case IP_MULTICAST_TTL:
1811 /*
1812 * Set the IP time-to-live for outgoing multicast packets.
1813 * The original multicast API required a char argument,
1814 * which is inconsistent with the rest of the socket API.
1815 * We allow either a char or an int.
1816 */
1817 if (sopt->sopt_valsize == 1) {
1818 u_char ttl;
1819 error = sooptcopyin(sopt, &ttl, 1, 1);
1820 if (error)
1821 break;
1822 imo->imo_multicast_ttl = ttl;
1823 } else {
1824 u_int ttl;
1825 error = sooptcopyin(sopt, &ttl, sizeof ttl,
1826 sizeof ttl);
1827 if (error)
1828 break;
1829 if (ttl > 255)
1830 error = EINVAL;
1831 else
1832 imo->imo_multicast_ttl = ttl;
1833 }
1834 break;
1835
1836 case IP_MULTICAST_LOOP:
1837 /*
1838 * Set the loopback flag for outgoing multicast packets.
1839 * Must be zero or one. The original multicast API required a
1840 * char argument, which is inconsistent with the rest
1841 * of the socket API. We allow either a char or an int.
1842 */
1843 if (sopt->sopt_valsize == 1) {
1844 u_char loop;
1845 error = sooptcopyin(sopt, &loop, 1, 1);
1846 if (error)
1847 break;
1848 imo->imo_multicast_loop = !!loop;
1849 } else {
1850 u_int loop;
1851 error = sooptcopyin(sopt, &loop, sizeof loop,
1852 sizeof loop);
1853 if (error)
1854 break;
1855 imo->imo_multicast_loop = !!loop;
1856 }
1857 break;
1858
1859 case IP_ADD_MEMBERSHIP:
1860 /*
1861 * Add a multicast group membership.
1862 * Group must be a valid IP multicast address.
1863 */
1864 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
1865 if (error)
1866 break;
1867
1868 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
1869 error = EINVAL;
1870 break;
1871 }
1872 s = splimp();
1873 /*
1874 * If no interface address was provided, use the interface of
1875 * the route to the given multicast address.
1876 */
1877 if (mreq.imr_interface.s_addr == INADDR_ANY) {
1878 bzero((caddr_t)&ro, sizeof(ro));
1879 dst = (struct sockaddr_in *)&ro.ro_dst;
1880 dst->sin_len = sizeof(*dst);
1881 dst->sin_family = AF_INET;
1882 dst->sin_addr = mreq.imr_multiaddr;
1883 rtalloc(&ro);
1884 if (ro.ro_rt == NULL) {
1885 error = EADDRNOTAVAIL;
1886 splx(s);
1887 break;
1888 }
1889 ifp = ro.ro_rt->rt_ifp;
1890 rtfree(ro.ro_rt);
1891 }
1892 else {
1893 ifp = ip_multicast_if(&mreq.imr_interface, NULL);
1894 }
1895
1896 /*
1897 * See if we found an interface, and confirm that it
1898 * supports multicast.
1899 */
1900 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
1901 error = EADDRNOTAVAIL;
1902 splx(s);
1903 break;
1904 }
1905 /*
1906 * See if the membership already exists or if all the
1907 * membership slots are full.
1908 */
1909 for (i = 0; i < imo->imo_num_memberships; ++i) {
1910 if (imo->imo_membership[i]->inm_ifp == ifp &&
1911 imo->imo_membership[i]->inm_addr.s_addr
1912 == mreq.imr_multiaddr.s_addr)
1913 break;
1914 }
1915 if (i < imo->imo_num_memberships) {
1916 error = EADDRINUSE;
1917 splx(s);
1918 break;
1919 }
1920 if (i == IP_MAX_MEMBERSHIPS) {
1921 error = ETOOMANYREFS;
1922 splx(s);
1923 break;
1924 }
1925 /*
1926 * Everything looks good; add a new record to the multicast
1927 * address list for the given interface.
1928 */
1929 if ((imo->imo_membership[i] =
1930 in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
1931 error = ENOBUFS;
1932 splx(s);
1933 break;
1934 }
1935 ++imo->imo_num_memberships;
1936 splx(s);
1937 break;
1938
1939 case IP_DROP_MEMBERSHIP:
1940 /*
1941 * Drop a multicast group membership.
1942 * Group must be a valid IP multicast address.
1943 */
1944 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
1945 if (error)
1946 break;
1947
1948 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
1949 error = EINVAL;
1950 break;
1951 }
1952
1953 s = splimp();
1954 /*
1955 * If an interface address was specified, get a pointer
1956 * to its ifnet structure.
1957 */
1958 if (mreq.imr_interface.s_addr == INADDR_ANY)
1959 ifp = NULL;
1960 else {
1961 ifp = ip_multicast_if(&mreq.imr_interface, NULL);
1962 if (ifp == NULL) {
1963 error = EADDRNOTAVAIL;
1964 splx(s);
1965 break;
1966 }
1967 }
1968 /*
1969 * Find the membership in the membership array.
1970 */
1971 for (i = 0; i < imo->imo_num_memberships; ++i) {
1972 if ((ifp == NULL ||
1973 imo->imo_membership[i]->inm_ifp == ifp) &&
1974 imo->imo_membership[i]->inm_addr.s_addr ==
1975 mreq.imr_multiaddr.s_addr)
1976 break;
1977 }
1978 if (i == imo->imo_num_memberships) {
1979 error = EADDRNOTAVAIL;
1980 splx(s);
1981 break;
1982 }
1983 /*
1984 * Give up the multicast address record to which the
1985 * membership points.
1986 */
1987 in_delmulti(imo->imo_membership[i]);
1988 /*
1989 * Remove the gap in the membership array.
1990 */
1991 for (++i; i < imo->imo_num_memberships; ++i)
1992 imo->imo_membership[i-1] = imo->imo_membership[i];
1993 --imo->imo_num_memberships;
1994 splx(s);
1995 break;
1996
1997 default:
1998 error = EOPNOTSUPP;
1999 break;
2000 }
2001
2002 /*
2003 * If all options have default values, no need to keep the mbuf.
2004 */
2005 if (imo->imo_multicast_ifp == NULL &&
2006 imo->imo_multicast_vif == -1 &&
2007 imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
2008 imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
2009 imo->imo_num_memberships == 0) {
2010 free(*imop, M_IPMOPTS);
2011 *imop = NULL;
2012 }
2013
2014 return (error);
2015}
2016
2017/*
2018 * Return the IP multicast options in response to user getsockopt().
2019 */
2020static int
2021ip_getmoptions(sopt, imo)
2022 struct sockopt *sopt;
2023 register struct ip_moptions *imo;
2024{
2025 struct in_addr addr;
2026 struct in_ifaddr *ia;
2027 int error, optval;
2028 u_char coptval;
2029
2030 error = 0;
2031 switch (sopt->sopt_name) {
2032 case IP_MULTICAST_VIF:
2033 if (imo != NULL)
2034 optval = imo->imo_multicast_vif;
2035 else
2036 optval = -1;
2037 error = sooptcopyout(sopt, &optval, sizeof optval);
2038 break;
2039
2040 case IP_MULTICAST_IF:
2041 if (imo == NULL || imo->imo_multicast_ifp == NULL)
2042 addr.s_addr = INADDR_ANY;
2043 else if (imo->imo_multicast_addr.s_addr) {
2044 /* return the value user has set */
2045 addr = imo->imo_multicast_addr;
2046 } else {
2047 IFP_TO_IA(imo->imo_multicast_ifp, ia);
2048 addr.s_addr = (ia == NULL) ? INADDR_ANY
2049 : IA_SIN(ia)->sin_addr.s_addr;
2050 }
2051 error = sooptcopyout(sopt, &addr, sizeof addr);
2052 break;
2053
2054 case IP_MULTICAST_TTL:
2055 if (imo == 0)
2056 optval = coptval = IP_DEFAULT_MULTICAST_TTL;
2057 else
2058 optval = coptval = imo->imo_multicast_ttl;
2059 if (sopt->sopt_valsize == 1)
2060 error = sooptcopyout(sopt, &coptval, 1);
2061 else
2062 error = sooptcopyout(sopt, &optval, sizeof optval);
2063 break;
2064
2065 case IP_MULTICAST_LOOP:
2066 if (imo == 0)
2067 optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
2068 else
2069 optval = coptval = imo->imo_multicast_loop;
2070 if (sopt->sopt_valsize == 1)
2071 error = sooptcopyout(sopt, &coptval, 1);
2072 else
2073 error = sooptcopyout(sopt, &optval, sizeof optval);
2074 break;
2075
2076 default:
2077 error = ENOPROTOOPT;
2078 break;
2079 }
2080 return (error);
2081}
2082
2083/*
2084 * Discard the IP multicast options.
2085 */
2086void
2087ip_freemoptions(imo)
2088 register struct ip_moptions *imo;
2089{
2090 register int i;
2091
2092 if (imo != NULL) {
2093 for (i = 0; i < imo->imo_num_memberships; ++i)
2094 in_delmulti(imo->imo_membership[i]);
2095 free(imo, M_IPMOPTS);
2096 }
2097}
2098
2099/*
2100 * Routine called from ip_output() to loop back a copy of an IP multicast
2101 * packet to the input queue of a specified interface. Note that this
2102 * calls the output routine of the loopback "driver", but with an interface
2103 * pointer that might NOT be a loopback interface -- evil, but easier than
2104 * replicating that code here.
2105 */
2106static void
2107ip_mloopback(ifp, m, dst, hlen)
2108 struct ifnet *ifp;
2109 register struct mbuf *m;
2110 register struct sockaddr_in *dst;
2111 int hlen;
2112{
2113 register struct ip *ip;
2114 struct mbuf *copym;
2115
2116 copym = m_copy(m, 0, M_COPYALL);
2117 if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
2118 copym = m_pullup(copym, hlen);
2119 if (copym != NULL) {
2120 /*
2121 * We don't bother to fragment if the IP length is greater
2122 * than the interface's MTU. Can this possibly matter?
2123 */
2124 ip = mtod(copym, struct ip *);
2125 ip->ip_len = htons(ip->ip_len);
2126 ip->ip_off = htons(ip->ip_off);
2127 ip->ip_sum = 0;
2128 if (ip->ip_vhl == IP_VHL_BORING) {
2129 ip->ip_sum = in_cksum_hdr(ip);
2130 } else {
2131 ip->ip_sum = in_cksum(copym, hlen);
2132 }
2133 /*
2134 * NB:
2135 * It's not clear whether there are any lingering
2136 * reentrancy problems in other areas which might
2137 * be exposed by using ip_input directly (in
2138 * particular, everything which modifies the packet
2139 * in-place). Yet another option is using the
2140 * protosw directly to deliver the looped back
2141 * packet. For the moment, we'll err on the side
2142 * of safety by using if_simloop().
2143 */
2144#if 1 /* XXX */
2145 if (dst->sin_family != AF_INET) {
2146 printf("ip_mloopback: bad address family %d\n",
2147 dst->sin_family);
2148 dst->sin_family = AF_INET;
2149 }
2150#endif
2151
2152#ifdef notdef
2153 copym->m_pkthdr.rcvif = ifp;
2154 ip_input(copym);
2155#else
2156 /* if the checksum hasn't been computed, mark it as valid */
2157 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2158 copym->m_pkthdr.csum_flags |=
2159 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
2160 copym->m_pkthdr.csum_data = 0xffff;
2161 }
2162 if_simloop(ifp, copym, dst->sin_family, 0);
2163#endif
2164 }
2165}