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kernel - revamp mtx_spinlock()
[dragonfly.git] / sys / netinet / ip_output.c
blob3c4a7e0bf4f88ee0791f94bf63989332616847ec
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
30 * $FreeBSD: src/sys/netinet/ip_output.c,v 1.99.2.37 2003/04/15 06:44:45 silby Exp $
31 * $DragonFly: src/sys/netinet/ip_output.c,v 1.67 2008/10/28 03:07:28 sephe Exp $
32 */
33
34 #define _IP_VHL
35
36 #include "opt_ipfw.h"
37 #include "opt_ipdn.h"
38 #include "opt_ipdivert.h"
39 #include "opt_ipfilter.h"
40 #include "opt_ipsec.h"
41 #include "opt_mbuf_stress_test.h"
42 #include "opt_mpls.h"
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
48 #include <sys/mbuf.h>
49 #include <sys/protosw.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52 #include <sys/proc.h>
53 #include <sys/priv.h>
54 #include <sys/sysctl.h>
55 #include <sys/in_cksum.h>
56 #include <sys/lock.h>
57
58 #include <sys/thread2.h>
59 #include <sys/mplock2.h>
60 #include <sys/msgport2.h>
61
62 #include <net/if.h>
63 #include <net/netisr.h>
64 #include <net/pfil.h>
65 #include <net/route.h>
66
67 #include <netinet/in.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/ip.h>
70 #include <netinet/in_pcb.h>
71 #include <netinet/in_var.h>
72 #include <netinet/ip_var.h>
73
74 #include <netproto/mpls/mpls_var.h>
75
76 static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
77
78 #ifdef IPSEC
79 #include <netinet6/ipsec.h>
80 #include <netproto/key/key.h>
81 #ifdef IPSEC_DEBUG
82 #include <netproto/key/key_debug.h>
83 #else
84 #define KEYDEBUG(lev,arg)
85 #endif
86 #endif /*IPSEC*/
87
88 #ifdef FAST_IPSEC
89 #include <netproto/ipsec/ipsec.h>
90 #include <netproto/ipsec/xform.h>
91 #include <netproto/ipsec/key.h>
92 #endif /*FAST_IPSEC*/
93
94 #include <net/ipfw/ip_fw.h>
95 #include <net/dummynet/ip_dummynet.h>
96
97 #define print_ip(x, a, y) kprintf("%s %d.%d.%d.%d%s",\
98 x, (ntohl(a.s_addr)>>24)&0xFF,\
99 (ntohl(a.s_addr)>>16)&0xFF,\
100 (ntohl(a.s_addr)>>8)&0xFF,\
101 (ntohl(a.s_addr))&0xFF, y);
102
103 u_short ip_id;
104
105 #ifdef MBUF_STRESS_TEST
106 int mbuf_frag_size = 0;
107 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
108 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
109 #endif
110
111 static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
112 static struct ifnet *ip_multicast_if(struct in_addr *, int *);
113 static void ip_mloopback
114 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int);
115 static int ip_getmoptions
116 (struct sockopt *, struct ip_moptions *);
117 static int ip_pcbopts(int, struct mbuf **, struct mbuf *);
118 static int ip_setmoptions
119 (struct sockopt *, struct ip_moptions **);
120
121 int ip_optcopy(struct ip *, struct ip *);
122
123 extern int route_assert_owner_access;
124
125 extern struct protosw inetsw[];
126
127 static int
128 ip_localforward(struct mbuf *m, const struct sockaddr_in *dst, int hlen)
129 {
130 struct in_ifaddr_container *iac;
131
132 /*
133 * We need to figure out if we have been forwarded to a local
134 * socket. If so, then we should somehow "loop back" to
135 * ip_input(), and get directed to the PCB as if we had received
136 * this packet. This is because it may be difficult to identify
137 * the packets you want to forward until they are being output
138 * and have selected an interface (e.g. locally initiated
139 * packets). If we used the loopback inteface, we would not be
140 * able to control what happens as the packet runs through
141 * ip_input() as it is done through a ISR.
142 */
143 LIST_FOREACH(iac, INADDR_HASH(dst->sin_addr.s_addr), ia_hash) {
144 /*
145 * If the addr to forward to is one of ours, we pretend
146 * to be the destination for this packet.
147 */
148 if (IA_SIN(iac->ia)->sin_addr.s_addr == dst->sin_addr.s_addr)
149 break;
150 }
151 if (iac != NULL) {
152 struct ip *ip;
153
154 if (m->m_pkthdr.rcvif == NULL)
155 m->m_pkthdr.rcvif = ifunit("lo0");
156 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
157 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID |
158 CSUM_PSEUDO_HDR;
159 m->m_pkthdr.csum_data = 0xffff;
160 }
161 m->m_pkthdr.csum_flags |= CSUM_IP_CHECKED | CSUM_IP_VALID;
162
163 /*
164 * Make sure that the IP header is in one mbuf,
165 * required by ip_input
166 */
167 if (m->m_len < hlen) {
168 m = m_pullup(m, hlen);
169 if (m == NULL) {
170 /* The packet was freed; we are done */
171 return 1;
172 }
173 }
174 ip = mtod(m, struct ip *);
175
176 ip->ip_len = htons(ip->ip_len);
177 ip->ip_off = htons(ip->ip_off);
178 ip_input(m);
179
180 return 1; /* The packet gets forwarded locally */
181 }
182 return 0;
183 }
184
185 /*
186 * IP output. The packet in mbuf chain m contains a skeletal IP
187 * header (with len, off, ttl, proto, tos, src, dst).
188 * The mbuf chain containing the packet will be freed.
189 * The mbuf opt, if present, will not be freed.
190 */
191 int
192 ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro,
193 int flags, struct ip_moptions *imo, struct inpcb *inp)
194 {
195 struct ip *ip;
196 struct ifnet *ifp = NULL; /* keep compiler happy */
197 struct mbuf *m;
198 int hlen = sizeof(struct ip);
199 int len, error = 0;
200 struct sockaddr_in *dst = NULL; /* keep compiler happy */
201 struct in_ifaddr *ia = NULL;
202 int isbroadcast, sw_csum;
203 struct in_addr pkt_dst;
204 struct route iproute;
205 struct m_tag *mtag;
206 #ifdef IPSEC
207 struct secpolicy *sp = NULL;
208 struct socket *so = inp ? inp->inp_socket : NULL;
209 #endif
210 #ifdef FAST_IPSEC
211 struct secpolicy *sp = NULL;
212 struct tdb_ident *tdbi;
213 #endif /* FAST_IPSEC */
214 struct sockaddr_in *next_hop = NULL;
215 int src_was_INADDR_ANY = 0; /* as the name says... */
216
217 m = m0;
218 M_ASSERTPKTHDR(m);
219
220 if (ro == NULL) {
221 ro = &iproute;
222 bzero(ro, sizeof *ro);
223 } else if (ro->ro_rt != NULL && ro->ro_rt->rt_cpuid != mycpuid) {
224 if (flags & IP_DEBUGROUTE) {
225 if (route_assert_owner_access) {
226 panic("ip_output: "
227 "rt rt_cpuid %d accessed on cpu %d\n",
228 ro->ro_rt->rt_cpuid, mycpuid);
229 } else {
230 kprintf("ip_output: "
231 "rt rt_cpuid %d accessed on cpu %d\n",
232 ro->ro_rt->rt_cpuid, mycpuid);
233 print_backtrace(-1);
234 }
235 }
236
237 /*
238 * XXX
239 * If the cached rtentry's owner CPU is not the current CPU,
240 * then don't touch the cached rtentry (remote free is too
241 * expensive in this context); just relocate the route.
242 */
243 ro = &iproute;
244 bzero(ro, sizeof *ro);
245 }
246
247 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
248 /* Next hop */
249 mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
250 KKASSERT(mtag != NULL);
251 next_hop = m_tag_data(mtag);
252 }
253
254 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
255 struct dn_pkt *dn_pkt;
256
257 /* Extract info from dummynet tag */
258 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
259 KKASSERT(mtag != NULL);
260 dn_pkt = m_tag_data(mtag);
261
262 /*
263 * The packet was already tagged, so part of the
264 * processing was already done, and we need to go down.
265 * Get the calculated parameters from the tag.
266 */
267 ifp = dn_pkt->ifp;
268
269 KKASSERT(ro == &iproute);
270 *ro = dn_pkt->ro; /* structure copy */
271 KKASSERT(ro->ro_rt == NULL || ro->ro_rt->rt_cpuid == mycpuid);
272
273 dst = dn_pkt->dn_dst;
274 if (dst == (struct sockaddr_in *)&(dn_pkt->ro.ro_dst)) {
275 /* If 'dst' points into dummynet tag, adjust it */
276 dst = (struct sockaddr_in *)&(ro->ro_dst);
277 }
278
279 ip = mtod(m, struct ip *);
280 hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
281 if (ro->ro_rt)
282 ia = ifatoia(ro->ro_rt->rt_ifa);
283 goto sendit;
284 }
285
286 if (opt) {
287 len = 0;
288 m = ip_insertoptions(m, opt, &len);
289 if (len != 0)
290 hlen = len;
291 }
292 ip = mtod(m, struct ip *);
293
294 /*
295 * Fill in IP header.
296 */
297 if (!(flags & (IP_FORWARDING|IP_RAWOUTPUT))) {
298 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
299 ip->ip_off &= IP_DF;
300 ip->ip_id = ip_newid();
301 ipstat.ips_localout++;
302 } else {
303 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
304 }
305
306 reroute:
307 pkt_dst = next_hop ? next_hop->sin_addr : ip->ip_dst;
308
309 dst = (struct sockaddr_in *)&ro->ro_dst;
310 /*
311 * If there is a cached route,
312 * check that it is to the same destination
313 * and is still up. If not, free it and try again.
314 * The address family should also be checked in case of sharing the
315 * cache with IPv6.
316 */
317 if (ro->ro_rt &&
318 (!(ro->ro_rt->rt_flags & RTF_UP) ||
319 dst->sin_family != AF_INET ||
320 dst->sin_addr.s_addr != pkt_dst.s_addr)) {
321 rtfree(ro->ro_rt);
322 ro->ro_rt = NULL;
323 }
324 if (ro->ro_rt == NULL) {
325 bzero(dst, sizeof *dst);
326 dst->sin_family = AF_INET;
327 dst->sin_len = sizeof *dst;
328 dst->sin_addr = pkt_dst;
329 }
330 /*
331 * If routing to interface only,
332 * short circuit routing lookup.
333 */
334 if (flags & IP_ROUTETOIF) {
335 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == NULL &&
336 (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == NULL) {
337 ipstat.ips_noroute++;
338 error = ENETUNREACH;
339 goto bad;
340 }
341 ifp = ia->ia_ifp;
342 ip->ip_ttl = 1;
343 isbroadcast = in_broadcast(dst->sin_addr, ifp);
344 } else if (IN_MULTICAST(ntohl(pkt_dst.s_addr)) &&
345 imo != NULL && imo->imo_multicast_ifp != NULL) {
346 /*
347 * Bypass the normal routing lookup for multicast
348 * packets if the interface is specified.
349 */
350 ifp = imo->imo_multicast_ifp;
351 ia = IFP_TO_IA(ifp);
352 isbroadcast = 0; /* fool gcc */
353 } else {
354 /*
355 * If this is the case, we probably don't want to allocate
356 * a protocol-cloned route since we didn't get one from the
357 * ULP. This lets TCP do its thing, while not burdening
358 * forwarding or ICMP with the overhead of cloning a route.
359 * Of course, we still want to do any cloning requested by
360 * the link layer, as this is probably required in all cases
361 * for correct operation (as it is for ARP).
362 */
363 if (ro->ro_rt == NULL)
364 rtalloc_ign(ro, RTF_PRCLONING);
365 if (ro->ro_rt == NULL) {
366 ipstat.ips_noroute++;
367 error = EHOSTUNREACH;
368 goto bad;
369 }
370 ia = ifatoia(ro->ro_rt->rt_ifa);
371 ifp = ro->ro_rt->rt_ifp;
372 ro->ro_rt->rt_use++;
373 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
374 dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
375 if (ro->ro_rt->rt_flags & RTF_HOST)
376 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
377 else
378 isbroadcast = in_broadcast(dst->sin_addr, ifp);
379 }
380 if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
381 struct in_multi *inm;
382
383 m->m_flags |= M_MCAST;
384 /*
385 * IP destination address is multicast. Make sure "dst"
386 * still points to the address in "ro". (It may have been
387 * changed to point to a gateway address, above.)
388 */
389 dst = (struct sockaddr_in *)&ro->ro_dst;
390 /*
391 * See if the caller provided any multicast options
392 */
393 if (imo != NULL) {
394 ip->ip_ttl = imo->imo_multicast_ttl;
395 if (imo->imo_multicast_vif != -1) {
396 ip->ip_src.s_addr =
397 ip_mcast_src ?
398 ip_mcast_src(imo->imo_multicast_vif) :
399 INADDR_ANY;
400 }
401 } else {
402 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
403 }
404 /*
405 * Confirm that the outgoing interface supports multicast.
406 */
407 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
408 if (!(ifp->if_flags & IFF_MULTICAST)) {
409 ipstat.ips_noroute++;
410 error = ENETUNREACH;
411 goto bad;
412 }
413 }
414 /*
415 * If source address not specified yet, use address
416 * of outgoing interface.
417 */
418 if (ip->ip_src.s_addr == INADDR_ANY) {
419 /* Interface may have no addresses. */
420 if (ia != NULL)
421 ip->ip_src = IA_SIN(ia)->sin_addr;
422 }
423
424 IN_LOOKUP_MULTI(pkt_dst, ifp, inm);
425 if (inm != NULL &&
426 (imo == NULL || imo->imo_multicast_loop)) {
427 /*
428 * If we belong to the destination multicast group
429 * on the outgoing interface, and the caller did not
430 * forbid loopback, loop back a copy.
431 */
432 ip_mloopback(ifp, m, dst, hlen);
433 } else {
434 /*
435 * If we are acting as a multicast router, perform
436 * multicast forwarding as if the packet had just
437 * arrived on the interface to which we are about
438 * to send. The multicast forwarding function
439 * recursively calls this function, using the
440 * IP_FORWARDING flag to prevent infinite recursion.
441 *
442 * Multicasts that are looped back by ip_mloopback(),
443 * above, will be forwarded by the ip_input() routine,
444 * if necessary.
445 */
446 if (ip_mrouter && !(flags & IP_FORWARDING)) {
447 /*
448 * If rsvp daemon is not running, do not
449 * set ip_moptions. This ensures that the packet
450 * is multicast and not just sent down one link
451 * as prescribed by rsvpd.
452 */
453 if (!rsvp_on)
454 imo = NULL;
455 if (ip_mforward) {
456 get_mplock();
457 if (ip_mforward(ip, ifp, m, imo) != 0) {
458 m_freem(m);
459 rel_mplock();
460 goto done;
461 }
462 rel_mplock();
463 }
464 }
465 }
466
467 /*
468 * Multicasts with a time-to-live of zero may be looped-
469 * back, above, but must not be transmitted on a network.
470 * Also, multicasts addressed to the loopback interface
471 * are not sent -- the above call to ip_mloopback() will
472 * loop back a copy if this host actually belongs to the
473 * destination group on the loopback interface.
474 */
475 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
476 m_freem(m);
477 goto done;
478 }
479
480 goto sendit;
481 } else {
482 m->m_flags &= ~M_MCAST;
483 }
484
485 /*
486 * If the source address is not specified yet, use the address
487 * of the outoing interface. In case, keep note we did that, so
488 * if the the firewall changes the next-hop causing the output
489 * interface to change, we can fix that.
490 */
491 if (ip->ip_src.s_addr == INADDR_ANY || src_was_INADDR_ANY) {
492 /* Interface may have no addresses. */
493 if (ia != NULL) {
494 ip->ip_src = IA_SIN(ia)->sin_addr;
495 src_was_INADDR_ANY = 1;
496 }
497 }
498
499 #ifdef ALTQ
500 /*
501 * Disable packet drop hack.
502 * Packetdrop should be done by queueing.
503 */
504 #else /* !ALTQ */
505 /*
506 * Verify that we have any chance at all of being able to queue
507 * the packet or packet fragments
508 */
509 if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
510 ifp->if_snd.ifq_maxlen) {
511 error = ENOBUFS;
512 ipstat.ips_odropped++;
513 goto bad;
514 }
515 #endif /* !ALTQ */
516
517 /*
518 * Look for broadcast address and
519 * verify user is allowed to send
520 * such a packet.
521 */
522 if (isbroadcast) {
523 if (!(ifp->if_flags & IFF_BROADCAST)) {
524 error = EADDRNOTAVAIL;
525 goto bad;
526 }
527 if (!(flags & IP_ALLOWBROADCAST)) {
528 error = EACCES;
529 goto bad;
530 }
531 /* don't allow broadcast messages to be fragmented */
532 if (ip->ip_len > ifp->if_mtu) {
533 error = EMSGSIZE;
534 goto bad;
535 }
536 m->m_flags |= M_BCAST;
537 } else {
538 m->m_flags &= ~M_BCAST;
539 }
540
541 sendit:
542 #ifdef IPSEC
543 /* get SP for this packet */
544 if (so == NULL)
545 sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
546 else
547 sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
548
549 if (sp == NULL) {
550 ipsecstat.out_inval++;
551 goto bad;
552 }
553
554 error = 0;
555
556 /* check policy */
557 switch (sp->policy) {
558 case IPSEC_POLICY_DISCARD:
559 /*
560 * This packet is just discarded.
561 */
562 ipsecstat.out_polvio++;
563 goto bad;
564
565 case IPSEC_POLICY_BYPASS:
566 case IPSEC_POLICY_NONE:
567 case IPSEC_POLICY_TCP:
568 /* no need to do IPsec. */
569 goto skip_ipsec;
570
571 case IPSEC_POLICY_IPSEC:
572 if (sp->req == NULL) {
573 /* acquire a policy */
574 error = key_spdacquire(sp);
575 goto bad;
576 }
577 break;
578
579 case IPSEC_POLICY_ENTRUST:
580 default:
581 kprintf("ip_output: Invalid policy found. %d\n", sp->policy);
582 }
583 {
584 struct ipsec_output_state state;
585 bzero(&state, sizeof state);
586 state.m = m;
587 if (flags & IP_ROUTETOIF) {
588 state.ro = &iproute;
589 bzero(&iproute, sizeof iproute);
590 } else
591 state.ro = ro;
592 state.dst = (struct sockaddr *)dst;
593
594 ip->ip_sum = 0;
595
596 /*
597 * XXX
598 * delayed checksums are not currently compatible with IPsec
599 */
600 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
601 in_delayed_cksum(m);
602 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
603 }
604
605 ip->ip_len = htons(ip->ip_len);
606 ip->ip_off = htons(ip->ip_off);
607
608 error = ipsec4_output(&state, sp, flags);
609
610 m = state.m;
611 if (flags & IP_ROUTETOIF) {
612 /*
613 * if we have tunnel mode SA, we may need to ignore
614 * IP_ROUTETOIF.
615 */
616 if (state.ro != &iproute || state.ro->ro_rt != NULL) {
617 flags &= ~IP_ROUTETOIF;
618 ro = state.ro;
619 }
620 } else
621 ro = state.ro;
622 dst = (struct sockaddr_in *)state.dst;
623 if (error) {
624 /* mbuf is already reclaimed in ipsec4_output. */
625 m0 = NULL;
626 switch (error) {
627 case EHOSTUNREACH:
628 case ENETUNREACH:
629 case EMSGSIZE:
630 case ENOBUFS:
631 case ENOMEM:
632 break;
633 default:
634 kprintf("ip4_output (ipsec): error code %d\n", error);
635 /*fall through*/
636 case ENOENT:
637 /* don't show these error codes to the user */
638 error = 0;
639 break;
640 }
641 goto bad;
642 }
643 }
644
645 /* be sure to update variables that are affected by ipsec4_output() */
646 ip = mtod(m, struct ip *);
647 #ifdef _IP_VHL
648 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
649 #else
650 hlen = ip->ip_hl << 2;
651 #endif
652 if (ro->ro_rt == NULL) {
653 if (!(flags & IP_ROUTETOIF)) {
654 kprintf("ip_output: "
655 "can't update route after IPsec processing\n");
656 error = EHOSTUNREACH; /*XXX*/
657 goto bad;
658 }
659 } else {
660 ia = ifatoia(ro->ro_rt->rt_ifa);
661 ifp = ro->ro_rt->rt_ifp;
662 }
663
664 /* make it flipped, again. */
665 ip->ip_len = ntohs(ip->ip_len);
666 ip->ip_off = ntohs(ip->ip_off);
667 skip_ipsec:
668 #endif /*IPSEC*/
669 #ifdef FAST_IPSEC
670 /*
671 * Check the security policy (SP) for the packet and, if
672 * required, do IPsec-related processing. There are two
673 * cases here; the first time a packet is sent through
674 * it will be untagged and handled by ipsec4_checkpolicy.
675 * If the packet is resubmitted to ip_output (e.g. after
676 * AH, ESP, etc. processing), there will be a tag to bypass
677 * the lookup and related policy checking.
678 */
679 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
680 crit_enter();
681 if (mtag != NULL) {
682 tdbi = (struct tdb_ident *)m_tag_data(mtag);
683 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
684 if (sp == NULL)
685 error = -EINVAL; /* force silent drop */
686 m_tag_delete(m, mtag);
687 } else {
688 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags,
689 &error, inp);
690 }
691 /*
692 * There are four return cases:
693 * sp != NULL apply IPsec policy
694 * sp == NULL, error == 0 no IPsec handling needed
695 * sp == NULL, error == -EINVAL discard packet w/o error
696 * sp == NULL, error != 0 discard packet, report error
697 */
698 if (sp != NULL) {
699 /* Loop detection, check if ipsec processing already done */
700 KASSERT(sp->req != NULL, ("ip_output: no ipsec request"));
701 for (mtag = m_tag_first(m); mtag != NULL;
702 mtag = m_tag_next(m, mtag)) {
703 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
704 continue;
705 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
706 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
707 continue;
708 /*
709 * Check if policy has an SA associated with it.
710 * This can happen when an SP has yet to acquire
711 * an SA; e.g. on first reference. If it occurs,
712 * then we let ipsec4_process_packet do its thing.
713 */
714 if (sp->req->sav == NULL)
715 break;
716 tdbi = (struct tdb_ident *)m_tag_data(mtag);
717 if (tdbi->spi == sp->req->sav->spi &&
718 tdbi->proto == sp->req->sav->sah->saidx.proto &&
719 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst,
720 sizeof(union sockaddr_union)) == 0) {
721 /*
722 * No IPsec processing is needed, free
723 * reference to SP.
724 *
725 * NB: null pointer to avoid free at
726 * done: below.
727 */
728 KEY_FREESP(&sp), sp = NULL;
729 crit_exit();
730 goto spd_done;
731 }
732 }
733
734 /*
735 * Do delayed checksums now because we send before
736 * this is done in the normal processing path.
737 */
738 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
739 in_delayed_cksum(m);
740 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
741 }
742
743 ip->ip_len = htons(ip->ip_len);
744 ip->ip_off = htons(ip->ip_off);
745
746 /* NB: callee frees mbuf */
747 error = ipsec4_process_packet(m, sp->req, flags, 0);
748 /*
749 * Preserve KAME behaviour: ENOENT can be returned
750 * when an SA acquire is in progress. Don't propagate
751 * this to user-level; it confuses applications.
752 *
753 * XXX this will go away when the SADB is redone.
754 */
755 if (error == ENOENT)
756 error = 0;
757 crit_exit();
758 goto done;
759 } else {
760 crit_exit();
761
762 if (error != 0) {
763 /*
764 * Hack: -EINVAL is used to signal that a packet
765 * should be silently discarded. This is typically
766 * because we asked key management for an SA and
767 * it was delayed (e.g. kicked up to IKE).
768 */
769 if (error == -EINVAL)
770 error = 0;
771 goto bad;
772 } else {
773 /* No IPsec processing for this packet. */
774 }
775 #ifdef notyet
776 /*
777 * If deferred crypto processing is needed, check that
778 * the interface supports it.
779 */
780 mtag = m_tag_find(m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL);
781 if (mtag != NULL && !(ifp->if_capenable & IFCAP_IPSEC)) {
782 /* notify IPsec to do its own crypto */
783 ipsp_skipcrypto_unmark((struct tdb_ident *)m_tag_data(mtag));
784 error = EHOSTUNREACH;
785 goto bad;
786 }
787 #endif
788 }
789 spd_done:
790 #endif /* FAST_IPSEC */
791
792 /* We are already being fwd'd from a firewall. */
793 if (next_hop != NULL)
794 goto pass;
795
796 /* No pfil hooks */
797 if (!pfil_has_hooks(&inet_pfil_hook)) {
798 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
799 /*
800 * Strip dummynet tags from stranded packets
801 */
802 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
803 KKASSERT(mtag != NULL);
804 m_tag_delete(m, mtag);
805 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
806 }
807 goto pass;
808 }
809
810 /*
811 * IpHack's section.
812 * - Xlate: translate packet's addr/port (NAT).
813 * - Firewall: deny/allow/etc.
814 * - Wrap: fake packet's addr/port <unimpl.>
815 * - Encapsulate: put it in another IP and send out. <unimp.>
816 */
817
818 /*
819 * Run through list of hooks for output packets.
820 */
821 error = pfil_run_hooks(&inet_pfil_hook, &m, ifp, PFIL_OUT);
822 if (error != 0 || m == NULL)
823 goto done;
824 ip = mtod(m, struct ip *);
825
826 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
827 /*
828 * Check dst to make sure it is directly reachable on the
829 * interface we previously thought it was.
830 * If it isn't (which may be likely in some situations) we have
831 * to re-route it (ie, find a route for the next-hop and the
832 * associated interface) and set them here. This is nested
833 * forwarding which in most cases is undesirable, except where
834 * such control is nigh impossible. So we do it here.
835 * And I'm babbling.
836 */
837 mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
838 KKASSERT(mtag != NULL);
839 next_hop = m_tag_data(mtag);
840
841 /*
842 * Try local forwarding first
843 */
844 if (ip_localforward(m, next_hop, hlen))
845 goto done;
846
847 /*
848 * Relocate the route based on next_hop.
849 * If the current route is inp's cache, keep it untouched.
850 */
851 if (ro == &iproute && ro->ro_rt != NULL) {
852 RTFREE(ro->ro_rt);
853 ro->ro_rt = NULL;
854 }
855 ro = &iproute;
856 bzero(ro, sizeof *ro);
857
858 /*
859 * Forwarding to broadcast address is not allowed.
860 * XXX Should we follow IP_ROUTETOIF?
861 */
862 flags &= ~(IP_ALLOWBROADCAST | IP_ROUTETOIF);
863
864 /* We are doing forwarding now */
865 flags |= IP_FORWARDING;
866
867 goto reroute;
868 }
869
870 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
871 struct dn_pkt *dn_pkt;
872
873 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
874 KKASSERT(mtag != NULL);
875 dn_pkt = m_tag_data(mtag);
876
877 /*
878 * Under certain cases it is not possible to recalculate
879 * 'ro' and 'dst', let alone 'flags', so just save them in
880 * dummynet tag and avoid the possible wrong reculcalation
881 * when we come back to ip_output() again.
882 *
883 * All other parameters have been already used and so they
884 * are not needed anymore.
885 * XXX if the ifp is deleted while a pkt is in dummynet,
886 * we are in trouble! (TODO use ifnet_detach_event)
887 *
888 * We need to copy *ro because for ICMP pkts (and maybe
889 * others) the caller passed a pointer into the stack;
890 * dst might also be a pointer into *ro so it needs to
891 * be updated.
892 */
893 dn_pkt->ro = *ro;
894 if (ro->ro_rt)
895 ro->ro_rt->rt_refcnt++;
896 if (dst == (struct sockaddr_in *)&ro->ro_dst) {
897 /* 'dst' points into 'ro' */
898 dst = (struct sockaddr_in *)&(dn_pkt->ro.ro_dst);
899 }
900 dn_pkt->dn_dst = dst;
901 dn_pkt->flags = flags;
902
903 ip_dn_queue(m);
904 goto done;
905 }
906 pass:
907 /* 127/8 must not appear on wire - RFC1122. */
908 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
909 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
910 if (!(ifp->if_flags & IFF_LOOPBACK)) {
911 ipstat.ips_badaddr++;
912 error = EADDRNOTAVAIL;
913 goto bad;
914 }
915 }
916
917 m->m_pkthdr.csum_flags |= CSUM_IP;
918 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
919 if (sw_csum & CSUM_DELAY_DATA) {
920 in_delayed_cksum(m);
921 sw_csum &= ~CSUM_DELAY_DATA;
922 }
923 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
924
925 /*
926 * If small enough for interface, or the interface will take
927 * care of the fragmentation for us, can just send directly.
928 */
929 if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) &&
930 !(ip->ip_off & IP_DF))) {
931 ip->ip_len = htons(ip->ip_len);
932 ip->ip_off = htons(ip->ip_off);
933 ip->ip_sum = 0;
934 if (sw_csum & CSUM_DELAY_IP) {
935 if (ip->ip_vhl == IP_VHL_BORING)
936 ip->ip_sum = in_cksum_hdr(ip);
937 else
938 ip->ip_sum = in_cksum(m, hlen);
939 }
940
941 /* Record statistics for this interface address. */
942 if (!(flags & IP_FORWARDING) && ia) {
943 ia->ia_ifa.if_opackets++;
944 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
945 }
946
947 #ifdef IPSEC
948 /* clean ipsec history once it goes out of the node */
949 ipsec_delaux(m);
950 #endif
951
952 #ifdef MBUF_STRESS_TEST
953 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) {
954 struct mbuf *m1, *m2;
955 int length, tmp;
956
957 tmp = length = m->m_pkthdr.len;
958
959 while ((length -= mbuf_frag_size) >= 1) {
960 m1 = m_split(m, length, MB_DONTWAIT);
961 if (m1 == NULL)
962 break;
963 m2 = m;
964 while (m2->m_next != NULL)
965 m2 = m2->m_next;
966 m2->m_next = m1;
967 }
968 m->m_pkthdr.len = tmp;
969 }
970 #endif
971
972 #ifdef MPLS
973 if (!mpls_output_process(m, ro->ro_rt))
974 goto done;
975 #endif
976 error = ifp->if_output(ifp, m, (struct sockaddr *)dst,
977 ro->ro_rt);
978 goto done;
979 }
980
981 if (ip->ip_off & IP_DF) {
982 error = EMSGSIZE;
983 /*
984 * This case can happen if the user changed the MTU
985 * of an interface after enabling IP on it. Because
986 * most netifs don't keep track of routes pointing to
987 * them, there is no way for one to update all its
988 * routes when the MTU is changed.
989 */
990 if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) &&
991 !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) &&
992 (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
993 ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
994 }
995 ipstat.ips_cantfrag++;
996 goto bad;
997 }
998
999 /*
1000 * Too large for interface; fragment if possible. If successful,
1001 * on return, m will point to a list of packets to be sent.
1002 */
1003 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, sw_csum);
1004 if (error)
1005 goto bad;
1006 for (; m; m = m0) {
1007 m0 = m->m_nextpkt;
1008 m->m_nextpkt = NULL;
1009 #ifdef IPSEC
1010 /* clean ipsec history once it goes out of the node */
1011 ipsec_delaux(m);
1012 #endif
1013 if (error == 0) {
1014 /* Record statistics for this interface address. */
1015 if (ia != NULL) {
1016 ia->ia_ifa.if_opackets++;
1017 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
1018 }
1019 #ifdef MPLS
1020 if (!mpls_output_process(m, ro->ro_rt))
1021 continue;
1022 #endif
1023 error = ifp->if_output(ifp, m, (struct sockaddr *)dst,
1024 ro->ro_rt);
1025 } else {
1026 m_freem(m);
1027 }
1028 }
1029
1030 if (error == 0)
1031 ipstat.ips_fragmented++;
1032
1033 done:
1034 if (ro == &iproute && ro->ro_rt != NULL) {
1035 RTFREE(ro->ro_rt);
1036 ro->ro_rt = NULL;
1037 }
1038 #ifdef IPSEC
1039 if (sp != NULL) {
1040 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1041 kprintf("DP ip_output call free SP:%p\n", sp));
1042 key_freesp(sp);
1043 }
1044 #endif
1045 #ifdef FAST_IPSEC
1046 if (sp != NULL)
1047 KEY_FREESP(&sp);
1048 #endif
1049 return (error);
1050 bad:
1051 m_freem(m);
1052 goto done;
1053 }
1054
1055 /*
1056 * Create a chain of fragments which fit the given mtu. m_frag points to the
1057 * mbuf to be fragmented; on return it points to the chain with the fragments.
1058 * Return 0 if no error. If error, m_frag may contain a partially built
1059 * chain of fragments that should be freed by the caller.
1060 *
1061 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
1062 * sw_csum contains the delayed checksums flags (e.g., CSUM_DELAY_IP).
1063 */
1064 int
1065 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
1066 u_long if_hwassist_flags, int sw_csum)
1067 {
1068 int error = 0;
1069 int hlen = IP_VHL_HL(ip->ip_vhl) << 2;
1070 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
1071 int off;
1072 struct mbuf *m0 = *m_frag; /* the original packet */
1073 int firstlen;
1074 struct mbuf **mnext;
1075 int nfrags;
1076
1077 if (ip->ip_off & IP_DF) { /* Fragmentation not allowed */
1078 ipstat.ips_cantfrag++;
1079 return EMSGSIZE;
1080 }
1081
1082 /*
1083 * Must be able to put at least 8 bytes per fragment.
1084 */
1085 if (len < 8)
1086 return EMSGSIZE;
1087
1088 /*
1089 * If the interface will not calculate checksums on
1090 * fragmented packets, then do it here.
1091 */
1092 if ((m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) &&
1093 !(if_hwassist_flags & CSUM_IP_FRAGS)) {
1094 in_delayed_cksum(m0);
1095 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1096 }
1097
1098 if (len > PAGE_SIZE) {
1099 /*
1100 * Fragment large datagrams such that each segment
1101 * contains a multiple of PAGE_SIZE amount of data,
1102 * plus headers. This enables a receiver to perform
1103 * page-flipping zero-copy optimizations.
1104 *
1105 * XXX When does this help given that sender and receiver
1106 * could have different page sizes, and also mtu could
1107 * be less than the receiver's page size ?
1108 */
1109 int newlen;
1110 struct mbuf *m;
1111
1112 for (m = m0, off = 0; m && (off+m->m_len) <= mtu; m = m->m_next)
1113 off += m->m_len;
1114
1115 /*
1116 * firstlen (off - hlen) must be aligned on an
1117 * 8-byte boundary
1118 */
1119 if (off < hlen)
1120 goto smart_frag_failure;
1121 off = ((off - hlen) & ~7) + hlen;
1122 newlen = (~PAGE_MASK) & mtu;
1123 if ((newlen + sizeof(struct ip)) > mtu) {
1124 /* we failed, go back the default */
1125 smart_frag_failure:
1126 newlen = len;
1127 off = hlen + len;
1128 }
1129 len = newlen;
1130
1131 } else {
1132 off = hlen + len;
1133 }
1134
1135 firstlen = off - hlen;
1136 mnext = &m0->m_nextpkt; /* pointer to next packet */
1137
1138 /*
1139 * Loop through length of segment after first fragment,
1140 * make new header and copy data of each part and link onto chain.
1141 * Here, m0 is the original packet, m is the fragment being created.
1142 * The fragments are linked off the m_nextpkt of the original
1143 * packet, which after processing serves as the first fragment.
1144 */
1145 for (nfrags = 1; off < ip->ip_len; off += len, nfrags++) {
1146 struct ip *mhip; /* ip header on the fragment */
1147 struct mbuf *m;
1148 int mhlen = sizeof(struct ip);
1149
1150 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1151 if (m == NULL) {
1152 error = ENOBUFS;
1153 ipstat.ips_odropped++;
1154 goto done;
1155 }
1156 m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
1157 /*
1158 * In the first mbuf, leave room for the link header, then
1159 * copy the original IP header including options. The payload
1160 * goes into an additional mbuf chain returned by m_copy().
1161 */
1162 m->m_data += max_linkhdr;
1163 mhip = mtod(m, struct ip *);
1164 *mhip = *ip;
1165 if (hlen > sizeof(struct ip)) {
1166 mhlen = ip_optcopy(ip, mhip) + sizeof(struct ip);
1167 mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
1168 }
1169 m->m_len = mhlen;
1170 /* XXX do we need to add ip->ip_off below ? */
1171 mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off;
1172 if (off + len >= ip->ip_len) { /* last fragment */
1173 len = ip->ip_len - off;
1174 m->m_flags |= M_LASTFRAG;
1175 } else
1176 mhip->ip_off |= IP_MF;
1177 mhip->ip_len = htons((u_short)(len + mhlen));
1178 m->m_next = m_copy(m0, off, len);
1179 if (m->m_next == NULL) { /* copy failed */
1180 m_free(m);
1181 error = ENOBUFS; /* ??? */
1182 ipstat.ips_odropped++;
1183 goto done;
1184 }
1185 m->m_pkthdr.len = mhlen + len;
1186 m->m_pkthdr.rcvif = NULL;
1187 m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
1188 mhip->ip_off = htons(mhip->ip_off);
1189 mhip->ip_sum = 0;
1190 if (sw_csum & CSUM_DELAY_IP)
1191 mhip->ip_sum = in_cksum(m, mhlen);
1192 *mnext = m;
1193 mnext = &m->m_nextpkt;
1194 }
1195 ipstat.ips_ofragments += nfrags;
1196
1197 /* set first marker for fragment chain */
1198 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
1199 m0->m_pkthdr.csum_data = nfrags;
1200
1201 /*
1202 * Update first fragment by trimming what's been copied out
1203 * and updating header.
1204 */
1205 m_adj(m0, hlen + firstlen - ip->ip_len);
1206 m0->m_pkthdr.len = hlen + firstlen;
1207 ip->ip_len = htons((u_short)m0->m_pkthdr.len);
1208 ip->ip_off |= IP_MF;
1209 ip->ip_off = htons(ip->ip_off);
1210 ip->ip_sum = 0;
1211 if (sw_csum & CSUM_DELAY_IP)
1212 ip->ip_sum = in_cksum(m0, hlen);
1213
1214 done:
1215 *m_frag = m0;
1216 return error;
1217 }
1218
1219 void
1220 in_delayed_cksum(struct mbuf *m)
1221 {
1222 struct ip *ip;
1223 u_short csum, offset;
1224
1225 ip = mtod(m, struct ip *);
1226 offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
1227 csum = in_cksum_skip(m, ip->ip_len, offset);
1228 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
1229 csum = 0xffff;
1230 offset += m->m_pkthdr.csum_data; /* checksum offset */
1231
1232 if (offset + sizeof(u_short) > m->m_len) {
1233 kprintf("delayed m_pullup, m->len: %d off: %d p: %d\n",
1234 m->m_len, offset, ip->ip_p);
1235 /*
1236 * XXX
1237 * this shouldn't happen, but if it does, the
1238 * correct behavior may be to insert the checksum
1239 * in the existing chain instead of rearranging it.
1240 */
1241 m = m_pullup(m, offset + sizeof(u_short));
1242 }
1243 *(u_short *)(m->m_data + offset) = csum;
1244 }
1245
1246 /*
1247 * Insert IP options into preformed packet.
1248 * Adjust IP destination as required for IP source routing,
1249 * as indicated by a non-zero in_addr at the start of the options.
1250 *
1251 * XXX This routine assumes that the packet has no options in place.
1252 */
1253 static struct mbuf *
1254 ip_insertoptions(struct mbuf *m, struct mbuf *opt, int *phlen)
1255 {
1256 struct ipoption *p = mtod(opt, struct ipoption *);
1257 struct mbuf *n;
1258 struct ip *ip = mtod(m, struct ip *);
1259 unsigned optlen;
1260
1261 optlen = opt->m_len - sizeof p->ipopt_dst;
1262 if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) {
1263 *phlen = 0;
1264 return (m); /* XXX should fail */
1265 }
1266 if (p->ipopt_dst.s_addr)
1267 ip->ip_dst = p->ipopt_dst;
1268 if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
1269 MGETHDR(n, MB_DONTWAIT, MT_HEADER);
1270 if (n == NULL) {
1271 *phlen = 0;
1272 return (m);
1273 }
1274 n->m_pkthdr.rcvif = NULL;
1275 n->m_pkthdr.len = m->m_pkthdr.len + optlen;
1276 m->m_len -= sizeof(struct ip);
1277 m->m_data += sizeof(struct ip);
1278 n->m_next = m;
1279 m = n;
1280 m->m_len = optlen + sizeof(struct ip);
1281 m->m_data += max_linkhdr;
1282 memcpy(mtod(m, void *), ip, sizeof(struct ip));
1283 } else {
1284 m->m_data -= optlen;
1285 m->m_len += optlen;
1286 m->m_pkthdr.len += optlen;
1287 ovbcopy(ip, mtod(m, caddr_t), sizeof(struct ip));
1288 }
1289 ip = mtod(m, struct ip *);
1290 bcopy(p->ipopt_list, ip + 1, optlen);
1291 *phlen = sizeof(struct ip) + optlen;
1292 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
1293 ip->ip_len += optlen;
1294 return (m);
1295 }
1296
1297 /*
1298 * Copy options from ip to jp,
1299 * omitting those not copied during fragmentation.
1300 */
1301 int
1302 ip_optcopy(struct ip *ip, struct ip *jp)
1303 {
1304 u_char *cp, *dp;
1305 int opt, optlen, cnt;
1306
1307 cp = (u_char *)(ip + 1);
1308 dp = (u_char *)(jp + 1);
1309 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
1310 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1311 opt = cp[0];
1312 if (opt == IPOPT_EOL)
1313 break;
1314 if (opt == IPOPT_NOP) {
1315 /* Preserve for IP mcast tunnel's LSRR alignment. */
1316 *dp++ = IPOPT_NOP;
1317 optlen = 1;
1318 continue;
1319 }
1320
1321 KASSERT(cnt >= IPOPT_OLEN + sizeof *cp,
1322 ("ip_optcopy: malformed ipv4 option"));
1323 optlen = cp[IPOPT_OLEN];
1324 KASSERT(optlen >= IPOPT_OLEN + sizeof *cp && optlen <= cnt,
1325 ("ip_optcopy: malformed ipv4 option"));
1326
1327 /* bogus lengths should have been caught by ip_dooptions */
1328 if (optlen > cnt)
1329 optlen = cnt;
1330 if (IPOPT_COPIED(opt)) {
1331 bcopy(cp, dp, optlen);
1332 dp += optlen;
1333 }
1334 }
1335 for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
1336 *dp++ = IPOPT_EOL;
1337 return (optlen);
1338 }
1339
1340 /*
1341 * IP socket option processing.
1342 */
1343 void
1344 ip_ctloutput(netmsg_t msg)
1345 {
1346 struct socket *so = msg->base.nm_so;
1347 struct sockopt *sopt = msg->ctloutput.nm_sopt;
1348 struct inpcb *inp = so->so_pcb;
1349 int error, optval;
1350
1351 error = optval = 0;
1352 if (sopt->sopt_level != IPPROTO_IP) {
1353 error = EINVAL;
1354 goto done;
1355 }
1356
1357 switch (sopt->sopt_dir) {
1358 case SOPT_SET:
1359 switch (sopt->sopt_name) {
1360 case IP_OPTIONS:
1361 #ifdef notyet
1362 case IP_RETOPTS:
1363 #endif
1364 {
1365 struct mbuf *m;
1366 if (sopt->sopt_valsize > MLEN) {
1367 error = EMSGSIZE;
1368 break;
1369 }
1370 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER);
1371 if (m == NULL) {
1372 error = ENOBUFS;
1373 break;
1374 }
1375 m->m_len = sopt->sopt_valsize;
1376 error = soopt_to_kbuf(sopt, mtod(m, void *), m->m_len,
1377 m->m_len);
1378 error = ip_pcbopts(sopt->sopt_name,
1379 &inp->inp_options, m);
1380 goto done;
1381 }
1382
1383 case IP_TOS:
1384 case IP_TTL:
1385 case IP_MINTTL:
1386 case IP_RECVOPTS:
1387 case IP_RECVRETOPTS:
1388 case IP_RECVDSTADDR:
1389 case IP_RECVIF:
1390 case IP_RECVTTL:
1391 case IP_FAITH:
1392 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1393 sizeof optval);
1394 if (error)
1395 break;
1396 switch (sopt->sopt_name) {
1397 case IP_TOS:
1398 inp->inp_ip_tos = optval;
1399 break;
1400
1401 case IP_TTL:
1402 inp->inp_ip_ttl = optval;
1403 break;
1404 case IP_MINTTL:
1405 if (optval >= 0 && optval <= MAXTTL)
1406 inp->inp_ip_minttl = optval;
1407 else
1408 error = EINVAL;
1409 break;
1410 #define OPTSET(bit) \
1411 if (optval) \
1412 inp->inp_flags |= bit; \
1413 else \
1414 inp->inp_flags &= ~bit;
1415
1416 case IP_RECVOPTS:
1417 OPTSET(INP_RECVOPTS);
1418 break;
1419
1420 case IP_RECVRETOPTS:
1421 OPTSET(INP_RECVRETOPTS);
1422 break;
1423
1424 case IP_RECVDSTADDR:
1425 OPTSET(INP_RECVDSTADDR);
1426 break;
1427
1428 case IP_RECVIF:
1429 OPTSET(INP_RECVIF);
1430 break;
1431
1432 case IP_RECVTTL:
1433 OPTSET(INP_RECVTTL);
1434 break;
1435
1436 case IP_FAITH:
1437 OPTSET(INP_FAITH);
1438 break;
1439 }
1440 break;
1441 #undef OPTSET
1442
1443 case IP_MULTICAST_IF:
1444 case IP_MULTICAST_VIF:
1445 case IP_MULTICAST_TTL:
1446 case IP_MULTICAST_LOOP:
1447 case IP_ADD_MEMBERSHIP:
1448 case IP_DROP_MEMBERSHIP:
1449 error = ip_setmoptions(sopt, &inp->inp_moptions);
1450 break;
1451
1452 case IP_PORTRANGE:
1453 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1454 sizeof optval);
1455 if (error)
1456 break;
1457
1458 switch (optval) {
1459 case IP_PORTRANGE_DEFAULT:
1460 inp->inp_flags &= ~(INP_LOWPORT);
1461 inp->inp_flags &= ~(INP_HIGHPORT);
1462 break;
1463
1464 case IP_PORTRANGE_HIGH:
1465 inp->inp_flags &= ~(INP_LOWPORT);
1466 inp->inp_flags |= INP_HIGHPORT;
1467 break;
1468
1469 case IP_PORTRANGE_LOW:
1470 inp->inp_flags &= ~(INP_HIGHPORT);
1471 inp->inp_flags |= INP_LOWPORT;
1472 break;
1473
1474 default:
1475 error = EINVAL;
1476 break;
1477 }
1478 break;
1479
1480 #if defined(IPSEC) || defined(FAST_IPSEC)
1481 case IP_IPSEC_POLICY:
1482 {
1483 caddr_t req;
1484 size_t len = 0;
1485 int priv;
1486 struct mbuf *m;
1487 int optname;
1488
1489 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1490 break;
1491 soopt_to_mbuf(sopt, m);
1492 priv = (sopt->sopt_td != NULL &&
1493 priv_check(sopt->sopt_td, PRIV_ROOT) != 0) ? 0 : 1;
1494 req = mtod(m, caddr_t);
1495 len = m->m_len;
1496 optname = sopt->sopt_name;
1497 error = ipsec4_set_policy(inp, optname, req, len, priv);
1498 m_freem(m);
1499 break;
1500 }
1501 #endif /*IPSEC*/
1502
1503 default:
1504 error = ENOPROTOOPT;
1505 break;
1506 }
1507 break;
1508
1509 case SOPT_GET:
1510 switch (sopt->sopt_name) {
1511 case IP_OPTIONS:
1512 case IP_RETOPTS:
1513 if (inp->inp_options)
1514 soopt_from_kbuf(sopt, mtod(inp->inp_options,
1515 char *),
1516 inp->inp_options->m_len);
1517 else
1518 sopt->sopt_valsize = 0;
1519 break;
1520
1521 case IP_TOS:
1522 case IP_TTL:
1523 case IP_MINTTL:
1524 case IP_RECVOPTS:
1525 case IP_RECVRETOPTS:
1526 case IP_RECVDSTADDR:
1527 case IP_RECVTTL:
1528 case IP_RECVIF:
1529 case IP_PORTRANGE:
1530 case IP_FAITH:
1531 switch (sopt->sopt_name) {
1532
1533 case IP_TOS:
1534 optval = inp->inp_ip_tos;
1535 break;
1536
1537 case IP_TTL:
1538 optval = inp->inp_ip_ttl;
1539 break;
1540 case IP_MINTTL:
1541 optval = inp->inp_ip_minttl;
1542 break;
1543
1544 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
1545
1546 case IP_RECVOPTS:
1547 optval = OPTBIT(INP_RECVOPTS);
1548 break;
1549
1550 case IP_RECVRETOPTS:
1551 optval = OPTBIT(INP_RECVRETOPTS);
1552 break;
1553
1554 case IP_RECVDSTADDR:
1555 optval = OPTBIT(INP_RECVDSTADDR);
1556 break;
1557
1558 case IP_RECVTTL:
1559 optval = OPTBIT(INP_RECVTTL);
1560 break;
1561
1562 case IP_RECVIF:
1563 optval = OPTBIT(INP_RECVIF);
1564 break;
1565
1566 case IP_PORTRANGE:
1567 if (inp->inp_flags & INP_HIGHPORT)
1568 optval = IP_PORTRANGE_HIGH;
1569 else if (inp->inp_flags & INP_LOWPORT)
1570 optval = IP_PORTRANGE_LOW;
1571 else
1572 optval = 0;
1573 break;
1574
1575 case IP_FAITH:
1576 optval = OPTBIT(INP_FAITH);
1577 break;
1578 }
1579 soopt_from_kbuf(sopt, &optval, sizeof optval);
1580 break;
1581
1582 case IP_MULTICAST_IF:
1583 case IP_MULTICAST_VIF:
1584 case IP_MULTICAST_TTL:
1585 case IP_MULTICAST_LOOP:
1586 case IP_ADD_MEMBERSHIP:
1587 case IP_DROP_MEMBERSHIP:
1588 error = ip_getmoptions(sopt, inp->inp_moptions);
1589 break;
1590
1591 #if defined(IPSEC) || defined(FAST_IPSEC)
1592 case IP_IPSEC_POLICY:
1593 {
1594 struct mbuf *m = NULL;
1595 caddr_t req = NULL;
1596 size_t len = 0;
1597
1598 if (m != NULL) {
1599 req = mtod(m, caddr_t);
1600 len = m->m_len;
1601 }
1602 error = ipsec4_get_policy(so->so_pcb, req, len, &m);
1603 if (error == 0)
1604 error = soopt_from_mbuf(sopt, m); /* XXX */
1605 if (error == 0)
1606 m_freem(m);
1607 break;
1608 }
1609 #endif /*IPSEC*/
1610
1611 default:
1612 error = ENOPROTOOPT;
1613 break;
1614 }
1615 break;
1616 }
1617 done:
1618 lwkt_replymsg(&msg->lmsg, error);
1619 }
1620
1621 /*
1622 * Set up IP options in pcb for insertion in output packets.
1623 * Store in mbuf with pointer in pcbopt, adding pseudo-option
1624 * with destination address if source routed.
1625 */
1626 static int
1627 ip_pcbopts(int optname, struct mbuf **pcbopt, struct mbuf *m)
1628 {
1629 int cnt, optlen;
1630 u_char *cp;
1631 u_char opt;
1632
1633 /* turn off any old options */
1634 if (*pcbopt)
1635 m_free(*pcbopt);
1636 *pcbopt = 0;
1637 if (m == NULL || m->m_len == 0) {
1638 /*
1639 * Only turning off any previous options.
1640 */
1641 if (m != NULL)
1642 m_free(m);
1643 return (0);
1644 }
1645
1646 if (m->m_len % sizeof(int32_t))
1647 goto bad;
1648 /*
1649 * IP first-hop destination address will be stored before
1650 * actual options; move other options back
1651 * and clear it when none present.
1652 */
1653 if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
1654 goto bad;
1655 cnt = m->m_len;
1656 m->m_len += sizeof(struct in_addr);
1657 cp = mtod(m, u_char *) + sizeof(struct in_addr);
1658 ovbcopy(mtod(m, caddr_t), cp, cnt);
1659 bzero(mtod(m, caddr_t), sizeof(struct in_addr));
1660
1661 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1662 opt = cp[IPOPT_OPTVAL];
1663 if (opt == IPOPT_EOL)
1664 break;
1665 if (opt == IPOPT_NOP)
1666 optlen = 1;
1667 else {
1668 if (cnt < IPOPT_OLEN + sizeof *cp)
1669 goto bad;
1670 optlen = cp[IPOPT_OLEN];
1671 if (optlen < IPOPT_OLEN + sizeof *cp || optlen > cnt)
1672 goto bad;
1673 }
1674 switch (opt) {
1675
1676 default:
1677 break;
1678
1679 case IPOPT_LSRR:
1680 case IPOPT_SSRR:
1681 /*
1682 * user process specifies route as:
1683 * ->A->B->C->D
1684 * D must be our final destination (but we can't
1685 * check that since we may not have connected yet).
1686 * A is first hop destination, which doesn't appear in
1687 * actual IP option, but is stored before the options.
1688 */
1689 if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
1690 goto bad;
1691 m->m_len -= sizeof(struct in_addr);
1692 cnt -= sizeof(struct in_addr);
1693 optlen -= sizeof(struct in_addr);
1694 cp[IPOPT_OLEN] = optlen;
1695 /*
1696 * Move first hop before start of options.
1697 */
1698 bcopy(&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
1699 sizeof(struct in_addr));
1700 /*
1701 * Then copy rest of options back
1702 * to close up the deleted entry.
1703 */
1704 ovbcopy(&cp[IPOPT_OFFSET+1] + sizeof(struct in_addr),
1705 &cp[IPOPT_OFFSET+1],
1706 cnt - (IPOPT_MINOFF - 1));
1707 break;
1708 }
1709 }
1710 if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
1711 goto bad;
1712 *pcbopt = m;
1713 return (0);
1714
1715 bad:
1716 m_free(m);
1717 return (EINVAL);
1718 }
1719
1720 /*
1721 * XXX
1722 * The whole multicast option thing needs to be re-thought.
1723 * Several of these options are equally applicable to non-multicast
1724 * transmission, and one (IP_MULTICAST_TTL) totally duplicates a
1725 * standard option (IP_TTL).
1726 */
1727
1728 /*
1729 * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index.
1730 */
1731 static struct ifnet *
1732 ip_multicast_if(struct in_addr *a, int *ifindexp)
1733 {
1734 int ifindex;
1735 struct ifnet *ifp;
1736
1737 if (ifindexp)
1738 *ifindexp = 0;
1739 if (ntohl(a->s_addr) >> 24 == 0) {
1740 ifindex = ntohl(a->s_addr) & 0xffffff;
1741 if (ifindex < 0 || if_index < ifindex)
1742 return NULL;
1743 ifp = ifindex2ifnet[ifindex];
1744 if (ifindexp)
1745 *ifindexp = ifindex;
1746 } else {
1747 ifp = INADDR_TO_IFP(a);
1748 }
1749 return ifp;
1750 }
1751
1752 /*
1753 * Set the IP multicast options in response to user setsockopt().
1754 */
1755 static int
1756 ip_setmoptions(struct sockopt *sopt, struct ip_moptions **imop)
1757 {
1758 int error = 0;
1759 int i;
1760 struct in_addr addr;
1761 struct ip_mreq mreq;
1762 struct ifnet *ifp;
1763 struct ip_moptions *imo = *imop;
1764 int ifindex;
1765
1766 if (imo == NULL) {
1767 /*
1768 * No multicast option buffer attached to the pcb;
1769 * allocate one and initialize to default values.
1770 */
1771 imo = kmalloc(sizeof *imo, M_IPMOPTS, M_WAITOK);
1772
1773 *imop = imo;
1774 imo->imo_multicast_ifp = NULL;
1775 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1776 imo->imo_multicast_vif = -1;
1777 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
1778 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
1779 imo->imo_num_memberships = 0;
1780 }
1781 switch (sopt->sopt_name) {
1782 /* store an index number for the vif you wanna use in the send */
1783 case IP_MULTICAST_VIF:
1784 if (legal_vif_num == 0) {
1785 error = EOPNOTSUPP;
1786 break;
1787 }
1788 error = soopt_to_kbuf(sopt, &i, sizeof i, sizeof i);
1789 if (error)
1790 break;
1791 if (!legal_vif_num(i) && (i != -1)) {
1792 error = EINVAL;
1793 break;
1794 }
1795 imo->imo_multicast_vif = i;
1796 break;
1797
1798 case IP_MULTICAST_IF:
1799 /*
1800 * Select the interface for outgoing multicast packets.
1801 */
1802 error = soopt_to_kbuf(sopt, &addr, sizeof addr, sizeof addr);
1803 if (error)
1804 break;
1805
1806 /*
1807 * INADDR_ANY is used to remove a previous selection.
1808 * When no interface is selected, a default one is
1809 * chosen every time a multicast packet is sent.
1810 */
1811 if (addr.s_addr == INADDR_ANY) {
1812 imo->imo_multicast_ifp = NULL;
1813 break;
1814 }
1815 /*
1816 * The selected interface is identified by its local
1817 * IP address. Find the interface and confirm that
1818 * it supports multicasting.
1819 */
1820 crit_enter();
1821 ifp = ip_multicast_if(&addr, &ifindex);
1822 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) {
1823 crit_exit();
1824 error = EADDRNOTAVAIL;
1825 break;
1826 }
1827 imo->imo_multicast_ifp = ifp;
1828 if (ifindex)
1829 imo->imo_multicast_addr = addr;
1830 else
1831 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1832 crit_exit();
1833 break;
1834
1835 case IP_MULTICAST_TTL:
1836 /*
1837 * Set the IP time-to-live for outgoing multicast packets.
1838 * The original multicast API required a char argument,
1839 * which is inconsistent with the rest of the socket API.
1840 * We allow either a char or an int.
1841 */
1842 if (sopt->sopt_valsize == 1) {
1843 u_char ttl;
1844 error = soopt_to_kbuf(sopt, &ttl, 1, 1);
1845 if (error)
1846 break;
1847 imo->imo_multicast_ttl = ttl;
1848 } else {
1849 u_int ttl;
1850 error = soopt_to_kbuf(sopt, &ttl, sizeof ttl, sizeof ttl);
1851 if (error)
1852 break;
1853 if (ttl > 255)
1854 error = EINVAL;
1855 else
1856 imo->imo_multicast_ttl = ttl;
1857 }
1858 break;
1859
1860 case IP_MULTICAST_LOOP:
1861 /*
1862 * Set the loopback flag for outgoing multicast packets.
1863 * Must be zero or one. The original multicast API required a
1864 * char argument, which is inconsistent with the rest
1865 * of the socket API. We allow either a char or an int.
1866 */
1867 if (sopt->sopt_valsize == 1) {
1868 u_char loop;
1869
1870 error = soopt_to_kbuf(sopt, &loop, 1, 1);
1871 if (error)
1872 break;
1873 imo->imo_multicast_loop = !!loop;
1874 } else {
1875 u_int loop;
1876
1877 error = soopt_to_kbuf(sopt, &loop, sizeof loop,
1878 sizeof loop);
1879 if (error)
1880 break;
1881 imo->imo_multicast_loop = !!loop;
1882 }
1883 break;
1884
1885 case IP_ADD_MEMBERSHIP:
1886 /*
1887 * Add a multicast group membership.
1888 * Group must be a valid IP multicast address.
1889 */
1890 error = soopt_to_kbuf(sopt, &mreq, sizeof mreq, sizeof mreq);
1891 if (error)
1892 break;
1893
1894 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
1895 error = EINVAL;
1896 break;
1897 }
1898 crit_enter();
1899 /*
1900 * If no interface address was provided, use the interface of
1901 * the route to the given multicast address.
1902 */
1903 if (mreq.imr_interface.s_addr == INADDR_ANY) {
1904 struct sockaddr_in dst;
1905 struct rtentry *rt;
1906
1907 bzero(&dst, sizeof(struct sockaddr_in));
1908 dst.sin_len = sizeof(struct sockaddr_in);
1909 dst.sin_family = AF_INET;
1910 dst.sin_addr = mreq.imr_multiaddr;
1911 rt = rtlookup((struct sockaddr *)&dst);
1912 if (rt == NULL) {
1913 error = EADDRNOTAVAIL;
1914 crit_exit();
1915 break;
1916 }
1917 --rt->rt_refcnt;
1918 ifp = rt->rt_ifp;
1919 } else {
1920 ifp = ip_multicast_if(&mreq.imr_interface, NULL);
1921 }
1922
1923 /*
1924 * See if we found an interface, and confirm that it
1925 * supports multicast.
1926 */
1927 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) {
1928 error = EADDRNOTAVAIL;
1929 crit_exit();
1930 break;
1931 }
1932 /*
1933 * See if the membership already exists or if all the
1934 * membership slots are full.
1935 */
1936 for (i = 0; i < imo->imo_num_memberships; ++i) {
1937 if (imo->imo_membership[i]->inm_ifp == ifp &&
1938 imo->imo_membership[i]->inm_addr.s_addr
1939 == mreq.imr_multiaddr.s_addr)
1940 break;
1941 }
1942 if (i < imo->imo_num_memberships) {
1943 error = EADDRINUSE;
1944 crit_exit();
1945 break;
1946 }
1947 if (i == IP_MAX_MEMBERSHIPS) {
1948 error = ETOOMANYREFS;
1949 crit_exit();
1950 break;
1951 }
1952 /*
1953 * Everything looks good; add a new record to the multicast
1954 * address list for the given interface.
1955 */
1956 if ((imo->imo_membership[i] =
1957 in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
1958 error = ENOBUFS;
1959 crit_exit();
1960 break;
1961 }
1962 ++imo->imo_num_memberships;
1963 crit_exit();
1964 break;
1965
1966 case IP_DROP_MEMBERSHIP:
1967 /*
1968 * Drop a multicast group membership.
1969 * Group must be a valid IP multicast address.
1970 */
1971 error = soopt_to_kbuf(sopt, &mreq, sizeof mreq, sizeof mreq);
1972 if (error)
1973 break;
1974
1975 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
1976 error = EINVAL;
1977 break;
1978 }
1979
1980 crit_enter();
1981 /*
1982 * If an interface address was specified, get a pointer
1983 * to its ifnet structure.
1984 */
1985 if (mreq.imr_interface.s_addr == INADDR_ANY)
1986 ifp = NULL;
1987 else {
1988 ifp = ip_multicast_if(&mreq.imr_interface, NULL);
1989 if (ifp == NULL) {
1990 error = EADDRNOTAVAIL;
1991 crit_exit();
1992 break;
1993 }
1994 }
1995 /*
1996 * Find the membership in the membership array.
1997 */
1998 for (i = 0; i < imo->imo_num_memberships; ++i) {
1999 if ((ifp == NULL ||
2000 imo->imo_membership[i]->inm_ifp == ifp) &&
2001 imo->imo_membership[i]->inm_addr.s_addr ==
2002 mreq.imr_multiaddr.s_addr)
2003 break;
2004 }
2005 if (i == imo->imo_num_memberships) {
2006 error = EADDRNOTAVAIL;
2007 crit_exit();
2008 break;
2009 }
2010 /*
2011 * Give up the multicast address record to which the
2012 * membership points.
2013 */
2014 in_delmulti(imo->imo_membership[i]);
2015 /*
2016 * Remove the gap in the membership array.
2017 */
2018 for (++i; i < imo->imo_num_memberships; ++i)
2019 imo->imo_membership[i-1] = imo->imo_membership[i];
2020 --imo->imo_num_memberships;
2021 crit_exit();
2022 break;
2023
2024 default:
2025 error = EOPNOTSUPP;
2026 break;
2027 }
2028
2029 /*
2030 * If all options have default values, no need to keep the mbuf.
2031 */
2032 if (imo->imo_multicast_ifp == NULL &&
2033 imo->imo_multicast_vif == -1 &&
2034 imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
2035 imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
2036 imo->imo_num_memberships == 0) {
2037 kfree(*imop, M_IPMOPTS);
2038 *imop = NULL;
2039 }
2040
2041 return (error);
2042 }
2043
2044 /*
2045 * Return the IP multicast options in response to user getsockopt().
2046 */
2047 static int
2048 ip_getmoptions(struct sockopt *sopt, struct ip_moptions *imo)
2049 {
2050 struct in_addr addr;
2051 struct in_ifaddr *ia;
2052 int error, optval;
2053 u_char coptval;
2054
2055 error = 0;
2056 switch (sopt->sopt_name) {
2057 case IP_MULTICAST_VIF:
2058 if (imo != NULL)
2059 optval = imo->imo_multicast_vif;
2060 else
2061 optval = -1;
2062 soopt_from_kbuf(sopt, &optval, sizeof optval);
2063 break;
2064
2065 case IP_MULTICAST_IF:
2066 if (imo == NULL || imo->imo_multicast_ifp == NULL)
2067 addr.s_addr = INADDR_ANY;
2068 else if (imo->imo_multicast_addr.s_addr) {
2069 /* return the value user has set */
2070 addr = imo->imo_multicast_addr;
2071 } else {
2072 ia = IFP_TO_IA(imo->imo_multicast_ifp);
2073 addr.s_addr = (ia == NULL) ? INADDR_ANY
2074 : IA_SIN(ia)->sin_addr.s_addr;
2075 }
2076 soopt_from_kbuf(sopt, &addr, sizeof addr);
2077 break;
2078
2079 case IP_MULTICAST_TTL:
2080 if (imo == NULL)
2081 optval = coptval = IP_DEFAULT_MULTICAST_TTL;
2082 else
2083 optval = coptval = imo->imo_multicast_ttl;
2084 if (sopt->sopt_valsize == 1)
2085 soopt_from_kbuf(sopt, &coptval, 1);
2086 else
2087 soopt_from_kbuf(sopt, &optval, sizeof optval);
2088 break;
2089
2090 case IP_MULTICAST_LOOP:
2091 if (imo == NULL)
2092 optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
2093 else
2094 optval = coptval = imo->imo_multicast_loop;
2095 if (sopt->sopt_valsize == 1)
2096 soopt_from_kbuf(sopt, &coptval, 1);
2097 else
2098 soopt_from_kbuf(sopt, &optval, sizeof optval);
2099 break;
2100
2101 default:
2102 error = ENOPROTOOPT;
2103 break;
2104 }
2105 return (error);
2106 }
2107
2108 /*
2109 * Discard the IP multicast options.
2110 */
2111 void
2112 ip_freemoptions(struct ip_moptions *imo)
2113 {
2114 int i;
2115
2116 if (imo != NULL) {
2117 for (i = 0; i < imo->imo_num_memberships; ++i)
2118 in_delmulti(imo->imo_membership[i]);
2119 kfree(imo, M_IPMOPTS);
2120 }
2121 }
2122
2123 /*
2124 * Routine called from ip_output() to loop back a copy of an IP multicast
2125 * packet to the input queue of a specified interface. Note that this
2126 * calls the output routine of the loopback "driver", but with an interface
2127 * pointer that might NOT be a loopback interface -- evil, but easier than
2128 * replicating that code here.
2129 */
2130 static void
2131 ip_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in *dst,
2132 int hlen)
2133 {
2134 struct ip *ip;
2135 struct mbuf *copym;
2136
2137 copym = m_copypacket(m, MB_DONTWAIT);
2138 if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
2139 copym = m_pullup(copym, hlen);
2140 if (copym != NULL) {
2141 /*
2142 * if the checksum hasn't been computed, mark it as valid
2143 */
2144 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2145 in_delayed_cksum(copym);
2146 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2147 copym->m_pkthdr.csum_flags |=
2148 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
2149 copym->m_pkthdr.csum_data = 0xffff;
2150 }
2151 /*
2152 * We don't bother to fragment if the IP length is greater
2153 * than the interface's MTU. Can this possibly matter?
2154 */
2155 ip = mtod(copym, struct ip *);
2156 ip->ip_len = htons(ip->ip_len);
2157 ip->ip_off = htons(ip->ip_off);
2158 ip->ip_sum = 0;
2159 if (ip->ip_vhl == IP_VHL_BORING) {
2160 ip->ip_sum = in_cksum_hdr(ip);
2161 } else {
2162 ip->ip_sum = in_cksum(copym, hlen);
2163 }
2164 /*
2165 * NB:
2166 * It's not clear whether there are any lingering
2167 * reentrancy problems in other areas which might
2168 * be exposed by using ip_input directly (in
2169 * particular, everything which modifies the packet
2170 * in-place). Yet another option is using the
2171 * protosw directly to deliver the looped back
2172 * packet. For the moment, we'll err on the side
2173 * of safety by using if_simloop().
2174 */
2175 #if 1 /* XXX */
2176 if (dst->sin_family != AF_INET) {
2177 kprintf("ip_mloopback: bad address family %d\n",
2178 dst->sin_family);
2179 dst->sin_family = AF_INET;
2180 }
2181 #endif
2182 get_mplock(); /* is if_simloop() mpsafe yet? */
2183 if_simloop(ifp, copym, dst->sin_family, 0);
2184 rel_mplock();
2185 }
2186 }
DragonFly BSD