Parallelize in_ifaddrhead operation
[dragonfly.git] / sys / netinet / ip_output.c
CommitLineData
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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.
e90fc8a2 13 * 3. Neither the name of the University nor the names of its contributors
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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 $
1b562c24 31 * $DragonFly: src/sys/netinet/ip_output.c,v 1.43 2008/06/08 08:38:05 sephe Exp $
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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"
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41#include "opt_mbuf_stress_test.h"
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/kernel.h>
46#include <sys/malloc.h>
47#include <sys/mbuf.h>
48#include <sys/protosw.h>
49#include <sys/socket.h>
50#include <sys/socketvar.h>
51#include <sys/proc.h>
52#include <sys/sysctl.h>
1cae611f 53#include <sys/thread2.h>
3f9db7f8 54#include <sys/in_cksum.h>
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55
56#include <net/if.h>
9eeaa8a9 57#include <net/netisr.h>
e7e55f42 58#include <net/pfil.h>
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59#include <net/route.h>
60
61#include <netinet/in.h>
62#include <netinet/in_systm.h>
63#include <netinet/ip.h>
64#include <netinet/in_pcb.h>
65#include <netinet/in_var.h>
66#include <netinet/ip_var.h>
67
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68static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
69
70#ifdef IPSEC
71#include <netinet6/ipsec.h>
d2438d69 72#include <netproto/key/key.h>
984263bc 73#ifdef IPSEC_DEBUG
d2438d69 74#include <netproto/key/key_debug.h>
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75#else
76#define KEYDEBUG(lev,arg)
77#endif
78#endif /*IPSEC*/
79
80#ifdef FAST_IPSEC
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81#include <netproto/ipsec/ipsec.h>
82#include <netproto/ipsec/xform.h>
83#include <netproto/ipsec/key.h>
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84#endif /*FAST_IPSEC*/
85
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86#include <net/ipfw/ip_fw.h>
87#include <net/dummynet/ip_dummynet.h>
984263bc 88
a6ec04bc 89#define print_ip(x, a, y) kprintf("%s %d.%d.%d.%d%s",\
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90 x, (ntohl(a.s_addr)>>24)&0xFF,\
91 (ntohl(a.s_addr)>>16)&0xFF,\
92 (ntohl(a.s_addr)>>8)&0xFF,\
93 (ntohl(a.s_addr))&0xFF, y);
94
95u_short ip_id;
96
97#ifdef MBUF_STRESS_TEST
98int mbuf_frag_size = 0;
99SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
100 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
101#endif
102
103static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
104static struct ifnet *ip_multicast_if(struct in_addr *, int *);
105static void ip_mloopback
106 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int);
107static int ip_getmoptions
108 (struct sockopt *, struct ip_moptions *);
109static int ip_pcbopts(int, struct mbuf **, struct mbuf *);
110static int ip_setmoptions
111 (struct sockopt *, struct ip_moptions **);
112
113int ip_optcopy(struct ip *, struct ip *);
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114
115
116extern struct protosw inetsw[];
117
118/*
119 * IP output. The packet in mbuf chain m contains a skeletal IP
120 * header (with len, off, ttl, proto, tos, src, dst).
121 * The mbuf chain containing the packet will be freed.
122 * The mbuf opt, if present, will not be freed.
123 */
124int
f1f552f6 125ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro,
5fe66e68 126 int flags, struct ip_moptions *imo, struct inpcb *inp)
984263bc 127{
f1f552f6 128 struct ip *ip;
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129 struct ifnet *ifp = NULL; /* keep compiler happy */
130 struct mbuf *m;
5fe66e68 131 int hlen = sizeof(struct ip);
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132 int len, off, error = 0;
133 struct sockaddr_in *dst = NULL; /* keep compiler happy */
134 struct in_ifaddr *ia = NULL;
135 int isbroadcast, sw_csum;
136 struct in_addr pkt_dst;
984263bc 137 struct route iproute;
4c7020ad 138 struct m_tag *dn_mtag = NULL;
fade9ce3 139#ifdef IPSEC
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140 struct secpolicy *sp = NULL;
141 struct socket *so = inp ? inp->inp_socket : NULL;
142#endif
143#ifdef FAST_IPSEC
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144 struct m_tag *mtag;
145 struct secpolicy *sp = NULL;
146 struct tdb_ident *tdbi;
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147#endif /* FAST_IPSEC */
148 struct ip_fw_args args;
149 int src_was_INADDR_ANY = 0; /* as the name says... */
150
151 args.eh = NULL;
152 args.rule = NULL;
153 args.next_hop = NULL;
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154
155 /* Grab info from MT_TAG mbufs prepended to the chain. */
5fe66e68 156 while (m0 != NULL && m0->m_type == MT_TAG) {
984263bc 157 switch(m0->_m_tag_id) {
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158 case PACKET_TAG_IPFORWARD:
159 args.next_hop = (struct sockaddr_in *)m0->m_data;
160 break;
5fe66e68 161 default:
a6ec04bc 162 kprintf("ip_output: unrecognised MT_TAG tag %d\n",
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163 m0->_m_tag_id);
164 break;
984263bc 165 }
5fe66e68 166 m0 = m0->m_next;
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167 }
168 m = m0;
814907cb 169 M_ASSERTPKTHDR(m);
fade9ce3 170
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171 /* Extract info from dummynet tag */
172 dn_mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
173 if (dn_mtag != NULL) {
174 struct dn_pkt *dn_pkt = m_tag_data(dn_mtag);
175
176 /*
177 * The packet was already tagged, so part of the
178 * processing was already done, and we need to go down.
179 * Get parameters from the tag.
180 */
84a3e25a 181 args.rule = dn_pkt->dn_priv;
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182 opt = NULL;
183 ro = &dn_pkt->ro;
184 imo = NULL;
185 dst = dn_pkt->dn_dst;
186 ifp = dn_pkt->ifp;
187 flags = dn_pkt->flags;
188
189 /*
190 * Don't delete the dummynet tag here, just unlink it,
191 * since some local variables (like 'ro' and 'dst') are
192 * still referencing certain parts of it.
193 * The dummynet tag will be freed at the end of the
194 * output process.
195 */
196 m_tag_unlink(m, dn_mtag);
197 }
198
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199 if (ro == NULL) {
200 ro = &iproute;
5fe66e68 201 bzero(ro, sizeof *ro);
fade9ce3 202 }
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203
204 if (args.rule != NULL) { /* dummynet already saw us */
205 ip = mtod(m, struct ip *);
206 hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
207 if (ro->ro_rt)
208 ia = ifatoia(ro->ro_rt->rt_ifa);
209 goto sendit;
210 }
211
212 if (opt) {
213 len = 0;
214 m = ip_insertoptions(m, opt, &len);
215 if (len != 0)
216 hlen = len;
217 }
218 ip = mtod(m, struct ip *);
219 pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst;
220
221 /*
222 * Fill in IP header.
223 */
f23061d4 224 if (!(flags & (IP_FORWARDING|IP_RAWOUTPUT))) {
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225 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
226 ip->ip_off &= IP_DF;
6277137d 227 ip->ip_id = ip_newid();
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228 ipstat.ips_localout++;
229 } else {
230 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
231 }
232
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233 dst = (struct sockaddr_in *)&ro->ro_dst;
234 /*
235 * If there is a cached route,
236 * check that it is to the same destination
237 * and is still up. If not, free it and try again.
238 * The address family should also be checked in case of sharing the
239 * cache with IPv6.
240 */
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241 if (ro->ro_rt &&
242 (!(ro->ro_rt->rt_flags & RTF_UP) ||
243 dst->sin_family != AF_INET ||
244 dst->sin_addr.s_addr != pkt_dst.s_addr)) {
5fe66e68 245 rtfree(ro->ro_rt);
f23061d4 246 ro->ro_rt = (struct rtentry *)NULL;
984263bc 247 }
f23061d4 248 if (ro->ro_rt == NULL) {
5fe66e68 249 bzero(dst, sizeof *dst);
984263bc 250 dst->sin_family = AF_INET;
5fe66e68 251 dst->sin_len = sizeof *dst;
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252 dst->sin_addr = pkt_dst;
253 }
254 /*
255 * If routing to interface only,
256 * short circuit routing lookup.
257 */
258 if (flags & IP_ROUTETOIF) {
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259 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == NULL &&
260 (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == NULL) {
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261 ipstat.ips_noroute++;
262 error = ENETUNREACH;
263 goto bad;
264 }
265 ifp = ia->ia_ifp;
266 ip->ip_ttl = 1;
267 isbroadcast = in_broadcast(dst->sin_addr, ifp);
268 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
f23061d4 269 imo != NULL && imo->imo_multicast_ifp != NULL) {
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270 /*
271 * Bypass the normal routing lookup for multicast
272 * packets if the interface is specified.
273 */
274 ifp = imo->imo_multicast_ifp;
1b562c24 275 ia = IFP_TO_IA(ifp);
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276 isbroadcast = 0; /* fool gcc */
277 } else {
278 /*
279 * If this is the case, we probably don't want to allocate
280 * a protocol-cloned route since we didn't get one from the
281 * ULP. This lets TCP do its thing, while not burdening
282 * forwarding or ICMP with the overhead of cloning a route.
283 * Of course, we still want to do any cloning requested by
284 * the link layer, as this is probably required in all cases
285 * for correct operation (as it is for ARP).
286 */
f23061d4 287 if (ro->ro_rt == NULL)
984263bc 288 rtalloc_ign(ro, RTF_PRCLONING);
f23061d4 289 if (ro->ro_rt == NULL) {
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290 ipstat.ips_noroute++;
291 error = EHOSTUNREACH;
292 goto bad;
293 }
294 ia = ifatoia(ro->ro_rt->rt_ifa);
295 ifp = ro->ro_rt->rt_ifp;
296 ro->ro_rt->rt_use++;
297 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
298 dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
299 if (ro->ro_rt->rt_flags & RTF_HOST)
300 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
301 else
302 isbroadcast = in_broadcast(dst->sin_addr, ifp);
303 }
304 if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
305 struct in_multi *inm;
306
307 m->m_flags |= M_MCAST;
308 /*
309 * IP destination address is multicast. Make sure "dst"
310 * still points to the address in "ro". (It may have been
311 * changed to point to a gateway address, above.)
312 */
313 dst = (struct sockaddr_in *)&ro->ro_dst;
314 /*
315 * See if the caller provided any multicast options
316 */
317 if (imo != NULL) {
318 ip->ip_ttl = imo->imo_multicast_ttl;
319 if (imo->imo_multicast_vif != -1)
320 ip->ip_src.s_addr =
321 ip_mcast_src ?
322 ip_mcast_src(imo->imo_multicast_vif) :
323 INADDR_ANY;
324 } else
325 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
326 /*
327 * Confirm that the outgoing interface supports multicast.
328 */
329 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
f23061d4 330 if (!(ifp->if_flags & IFF_MULTICAST)) {
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331 ipstat.ips_noroute++;
332 error = ENETUNREACH;
333 goto bad;
334 }
335 }
336 /*
337 * If source address not specified yet, use address
338 * of outgoing interface.
339 */
340 if (ip->ip_src.s_addr == INADDR_ANY) {
341 /* Interface may have no addresses. */
342 if (ia != NULL)
343 ip->ip_src = IA_SIN(ia)->sin_addr;
344 }
345
346 IN_LOOKUP_MULTI(pkt_dst, ifp, inm);
347 if (inm != NULL &&
348 (imo == NULL || imo->imo_multicast_loop)) {
349 /*
350 * If we belong to the destination multicast group
351 * on the outgoing interface, and the caller did not
352 * forbid loopback, loop back a copy.
353 */
354 ip_mloopback(ifp, m, dst, hlen);
355 }
356 else {
357 /*
358 * If we are acting as a multicast router, perform
359 * multicast forwarding as if the packet had just
360 * arrived on the interface to which we are about
361 * to send. The multicast forwarding function
362 * recursively calls this function, using the
363 * IP_FORWARDING flag to prevent infinite recursion.
364 *
365 * Multicasts that are looped back by ip_mloopback(),
366 * above, will be forwarded by the ip_input() routine,
367 * if necessary.
368 */
f23061d4 369 if (ip_mrouter && !(flags & IP_FORWARDING)) {
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370 /*
371 * If rsvp daemon is not running, do not
372 * set ip_moptions. This ensures that the packet
373 * is multicast and not just sent down one link
374 * as prescribed by rsvpd.
375 */
376 if (!rsvp_on)
377 imo = NULL;
378 if (ip_mforward &&
379 ip_mforward(ip, ifp, m, imo) != 0) {
380 m_freem(m);
381 goto done;
382 }
383 }
384 }
385
386 /*
387 * Multicasts with a time-to-live of zero may be looped-
388 * back, above, but must not be transmitted on a network.
389 * Also, multicasts addressed to the loopback interface
390 * are not sent -- the above call to ip_mloopback() will
391 * loop back a copy if this host actually belongs to the
392 * destination group on the loopback interface.
393 */
394 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
395 m_freem(m);
396 goto done;
397 }
398
399 goto sendit;
400 }
401#ifndef notdef
402 /*
403 * If the source address is not specified yet, use the address
404 * of the outoing interface. In case, keep note we did that, so
405 * if the the firewall changes the next-hop causing the output
406 * interface to change, we can fix that.
407 */
408 if (ip->ip_src.s_addr == INADDR_ANY) {
409 /* Interface may have no addresses. */
410 if (ia != NULL) {
411 ip->ip_src = IA_SIN(ia)->sin_addr;
412 src_was_INADDR_ANY = 1;
413 }
414 }
415#endif /* notdef */
4d723e5a
JS
416#ifdef ALTQ
417 /*
418 * Disable packet drop hack.
419 * Packetdrop should be done by queueing.
420 */
421#else /* !ALTQ */
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422 /*
423 * Verify that we have any chance at all of being able to queue
424 * the packet or packet fragments
425 */
426 if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
427 ifp->if_snd.ifq_maxlen) {
428 error = ENOBUFS;
429 ipstat.ips_odropped++;
430 goto bad;
431 }
4d723e5a 432#endif /* !ALTQ */
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433
434 /*
435 * Look for broadcast address and
436 * verify user is allowed to send
437 * such a packet.
438 */
439 if (isbroadcast) {
f23061d4 440 if (!(ifp->if_flags & IFF_BROADCAST)) {
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441 error = EADDRNOTAVAIL;
442 goto bad;
443 }
f23061d4 444 if (!(flags & IP_ALLOWBROADCAST)) {
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445 error = EACCES;
446 goto bad;
447 }
448 /* don't allow broadcast messages to be fragmented */
f1f552f6 449 if (ip->ip_len > ifp->if_mtu) {
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450 error = EMSGSIZE;
451 goto bad;
452 }
453 m->m_flags |= M_BCAST;
454 } else {
455 m->m_flags &= ~M_BCAST;
456 }
457
458sendit:
459#ifdef IPSEC
460 /* get SP for this packet */
461 if (so == NULL)
462 sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
463 else
464 sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
465
466 if (sp == NULL) {
467 ipsecstat.out_inval++;
468 goto bad;
469 }
470
471 error = 0;
472
473 /* check policy */
474 switch (sp->policy) {
475 case IPSEC_POLICY_DISCARD:
476 /*
477 * This packet is just discarded.
478 */
479 ipsecstat.out_polvio++;
480 goto bad;
481
482 case IPSEC_POLICY_BYPASS:
483 case IPSEC_POLICY_NONE:
484 /* no need to do IPsec. */
485 goto skip_ipsec;
5fe66e68 486
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487 case IPSEC_POLICY_IPSEC:
488 if (sp->req == NULL) {
489 /* acquire a policy */
490 error = key_spdacquire(sp);
491 goto bad;
492 }
493 break;
494
495 case IPSEC_POLICY_ENTRUST:
496 default:
a6ec04bc 497 kprintf("ip_output: Invalid policy found. %d\n", sp->policy);
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498 }
499 {
500 struct ipsec_output_state state;
5fe66e68 501 bzero(&state, sizeof state);
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502 state.m = m;
503 if (flags & IP_ROUTETOIF) {
504 state.ro = &iproute;
5fe66e68 505 bzero(&iproute, sizeof iproute);
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506 } else
507 state.ro = ro;
508 state.dst = (struct sockaddr *)dst;
509
510 ip->ip_sum = 0;
511
512 /*
513 * XXX
514 * delayed checksums are not currently compatible with IPsec
515 */
516 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
517 in_delayed_cksum(m);
518 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
519 }
520
521 ip->ip_len = htons(ip->ip_len);
522 ip->ip_off = htons(ip->ip_off);
523
524 error = ipsec4_output(&state, sp, flags);
525
526 m = state.m;
527 if (flags & IP_ROUTETOIF) {
528 /*
529 * if we have tunnel mode SA, we may need to ignore
530 * IP_ROUTETOIF.
531 */
532 if (state.ro != &iproute || state.ro->ro_rt != NULL) {
533 flags &= ~IP_ROUTETOIF;
534 ro = state.ro;
535 }
536 } else
537 ro = state.ro;
538 dst = (struct sockaddr_in *)state.dst;
539 if (error) {
540 /* mbuf is already reclaimed in ipsec4_output. */
541 m0 = NULL;
542 switch (error) {
543 case EHOSTUNREACH:
544 case ENETUNREACH:
545 case EMSGSIZE:
546 case ENOBUFS:
547 case ENOMEM:
548 break;
549 default:
a6ec04bc 550 kprintf("ip4_output (ipsec): error code %d\n", error);
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551 /*fall through*/
552 case ENOENT:
553 /* don't show these error codes to the user */
554 error = 0;
555 break;
556 }
557 goto bad;
558 }
559 }
560
561 /* be sure to update variables that are affected by ipsec4_output() */
562 ip = mtod(m, struct ip *);
563#ifdef _IP_VHL
564 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
565#else
566 hlen = ip->ip_hl << 2;
567#endif
568 if (ro->ro_rt == NULL) {
f23061d4 569 if (!(flags & IP_ROUTETOIF)) {
a6ec04bc 570 kprintf("ip_output: "
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571 "can't update route after IPsec processing\n");
572 error = EHOSTUNREACH; /*XXX*/
573 goto bad;
574 }
575 } else {
576 ia = ifatoia(ro->ro_rt->rt_ifa);
577 ifp = ro->ro_rt->rt_ifp;
578 }
579
580 /* make it flipped, again. */
581 ip->ip_len = ntohs(ip->ip_len);
582 ip->ip_off = ntohs(ip->ip_off);
583skip_ipsec:
584#endif /*IPSEC*/
585#ifdef FAST_IPSEC
586 /*
587 * Check the security policy (SP) for the packet and, if
588 * required, do IPsec-related processing. There are two
589 * cases here; the first time a packet is sent through
590 * it will be untagged and handled by ipsec4_checkpolicy.
591 * If the packet is resubmitted to ip_output (e.g. after
592 * AH, ESP, etc. processing), there will be a tag to bypass
593 * the lookup and related policy checking.
594 */
595 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
1cae611f 596 crit_enter();
984263bc 597 if (mtag != NULL) {
d031aa80 598 tdbi = (struct tdb_ident *)m_tag_data(mtag);
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599 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
600 if (sp == NULL)
601 error = -EINVAL; /* force silent drop */
602 m_tag_delete(m, mtag);
603 } else {
604 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags,
605 &error, inp);
606 }
607 /*
608 * There are four return cases:
f23061d4 609 * sp != NULL apply IPsec policy
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610 * sp == NULL, error == 0 no IPsec handling needed
611 * sp == NULL, error == -EINVAL discard packet w/o error
612 * sp == NULL, error != 0 discard packet, report error
613 */
614 if (sp != NULL) {
615 /* Loop detection, check if ipsec processing already done */
616 KASSERT(sp->req != NULL, ("ip_output: no ipsec request"));
617 for (mtag = m_tag_first(m); mtag != NULL;
618 mtag = m_tag_next(m, mtag)) {
619 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
620 continue;
621 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
622 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
623 continue;
624 /*
625 * Check if policy has an SA associated with it.
626 * This can happen when an SP has yet to acquire
627 * an SA; e.g. on first reference. If it occurs,
628 * then we let ipsec4_process_packet do its thing.
629 */
630 if (sp->req->sav == NULL)
631 break;
d031aa80 632 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
633 if (tdbi->spi == sp->req->sav->spi &&
634 tdbi->proto == sp->req->sav->sah->saidx.proto &&
635 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst,
5fe66e68 636 sizeof(union sockaddr_union)) == 0) {
984263bc
MD
637 /*
638 * No IPsec processing is needed, free
639 * reference to SP.
640 *
641 * NB: null pointer to avoid free at
642 * done: below.
643 */
644 KEY_FREESP(&sp), sp = NULL;
1cae611f 645 crit_exit();
984263bc
MD
646 goto spd_done;
647 }
648 }
649
650 /*
651 * Do delayed checksums now because we send before
652 * this is done in the normal processing path.
653 */
654 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
655 in_delayed_cksum(m);
656 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
657 }
658
659 ip->ip_len = htons(ip->ip_len);
660 ip->ip_off = htons(ip->ip_off);
661
662 /* NB: callee frees mbuf */
663 error = ipsec4_process_packet(m, sp->req, flags, 0);
664 /*
665 * Preserve KAME behaviour: ENOENT can be returned
666 * when an SA acquire is in progress. Don't propagate
667 * this to user-level; it confuses applications.
668 *
669 * XXX this will go away when the SADB is redone.
670 */
671 if (error == ENOENT)
672 error = 0;
1cae611f 673 crit_exit();
984263bc
MD
674 goto done;
675 } else {
1cae611f 676 crit_exit();
984263bc
MD
677
678 if (error != 0) {
679 /*
680 * Hack: -EINVAL is used to signal that a packet
681 * should be silently discarded. This is typically
682 * because we asked key management for an SA and
683 * it was delayed (e.g. kicked up to IKE).
684 */
685 if (error == -EINVAL)
686 error = 0;
687 goto bad;
688 } else {
689 /* No IPsec processing for this packet. */
690 }
691#ifdef notyet
692 /*
693 * If deferred crypto processing is needed, check that
694 * the interface supports it.
f23061d4 695 */
984263bc 696 mtag = m_tag_find(m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL);
f23061d4 697 if (mtag != NULL && !(ifp->if_capenable & IFCAP_IPSEC)) {
984263bc 698 /* notify IPsec to do its own crypto */
d031aa80 699 ipsp_skipcrypto_unmark((struct tdb_ident *)m_tag_data(mtag));
984263bc
MD
700 error = EHOSTUNREACH;
701 goto bad;
702 }
703#endif
704 }
705spd_done:
706#endif /* FAST_IPSEC */
707 /*
708 * IpHack's section.
709 * - Xlate: translate packet's addr/port (NAT).
710 * - Firewall: deny/allow/etc.
711 * - Wrap: fake packet's addr/port <unimpl.>
712 * - Encapsulate: put it in another IP and send out. <unimp.>
f23061d4 713 */
5e3f3b7a 714
e7e55f42
JR
715 /*
716 * Run through list of hooks for output packets.
717 */
afabe90c
MD
718 if (pfil_has_hooks(&inet_pfil_hook)) {
719 error = pfil_run_hooks(&inet_pfil_hook, &m, ifp, PFIL_OUT);
720 if (error != 0 || m == NULL)
721 goto done;
722 ip = mtod(m, struct ip *);
723 }
984263bc
MD
724
725 /*
726 * Check with the firewall...
727 * but not if we are already being fwd'd from a firewall.
728 */
729 if (fw_enable && IPFW_LOADED && !args.next_hop) {
730 struct sockaddr_in *old = dst;
731
732 args.m = m;
733 args.next_hop = dst;
734 args.oif = ifp;
735 off = ip_fw_chk_ptr(&args);
736 m = args.m;
737 dst = args.next_hop;
738
f23061d4 739 /*
984263bc
MD
740 * On return we must do the following:
741 * m == NULL -> drop the pkt (old interface, deprecated)
742 * (off & IP_FW_PORT_DENY_FLAG) -> drop the pkt (new interface)
743 * 1<=off<= 0xffff -> DIVERT
744 * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe
745 * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet
746 * dst != old -> IPFIREWALL_FORWARD
747 * off==0, dst==old -> accept
748 * If some of the above modules are not compiled in, then
749 * we should't have to check the corresponding condition
750 * (because the ipfw control socket should not accept
751 * unsupported rules), but better play safe and drop
752 * packets in case of doubt.
753 */
754 if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) {
755 if (m)
756 m_freem(m);
757 error = EACCES;
758 goto done;
759 }
760 ip = mtod(m, struct ip *);
761 if (off == 0 && dst == old) /* common case */
762 goto pass;
84a3e25a 763 if (off & IP_FW_PORT_DYNT_FLAG) {
984263bc
MD
764 /*
765 * pass the pkt to dummynet. Need to include
766 * pipe number, m, ifp, ro, dst because these are
767 * not recomputed in the next pass.
768 * All other parameters have been already used and
f23061d4 769 * so they are not needed anymore.
984263bc
MD
770 * XXX note: if the ifp or ro entry are deleted
771 * while a pkt is in dummynet, we are in trouble!
f23061d4 772 */
984263bc
MD
773 args.ro = ro;
774 args.dst = dst;
775 args.flags = flags;
776
84a3e25a
SZ
777 error = 0;
778 ip_fw_dn_io_ptr(m, off & 0xffff, DN_TO_IP_OUT, &args);
984263bc
MD
779 goto done;
780 }
781#ifdef IPDIVERT
f23061d4 782 if (off != 0 && !(off & IP_FW_PORT_DYNT_FLAG)) {
984263bc
MD
783 struct mbuf *clone = NULL;
784
785 /* Clone packet if we're doing a 'tee' */
f23061d4 786 if ((off & IP_FW_PORT_TEE_FLAG))
74f1caca 787 clone = m_dup(m, MB_DONTWAIT);
984263bc
MD
788
789 /*
790 * XXX
791 * delayed checksums are not currently compatible
792 * with divert sockets.
793 */
794 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
795 in_delayed_cksum(m);
796 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
797 }
798
799 /* Restore packet header fields to original values */
800 ip->ip_len = htons(ip->ip_len);
801 ip->ip_off = htons(ip->ip_off);
802
803 /* Deliver packet to divert input routine */
e5ecc832 804 divert_packet(m, 0, off & 0xffff);
984263bc
MD
805
806 /* If 'tee', continue with original packet */
807 if (clone != NULL) {
808 m = clone;
809 ip = mtod(m, struct ip *);
810 goto pass;
811 }
812 goto done;
813 }
814#endif
815
816 /* IPFIREWALL_FORWARD */
817 /*
818 * Check dst to make sure it is directly reachable on the
819 * interface we previously thought it was.
820 * If it isn't (which may be likely in some situations) we have
821 * to re-route it (ie, find a route for the next-hop and the
822 * associated interface) and set them here. This is nested
823 * forwarding which in most cases is undesirable, except where
824 * such control is nigh impossible. So we do it here.
825 * And I'm babbling.
826 */
827 if (off == 0 && old != dst) { /* FORWARD, dst has changed */
828#if 0
829 /*
830 * XXX To improve readability, this block should be
831 * changed into a function call as below:
832 */
833 error = ip_ipforward(&m, &dst, &ifp);
834 if (error)
835 goto bad;
836 if (m == NULL) /* ip_input consumed the mbuf */
837 goto done;
838#else
839 struct in_ifaddr *ia;
840
841 /*
842 * XXX sro_fwd below is static, and a pointer
843 * to it gets passed to routines downstream.
844 * This could have surprisingly bad results in
845 * practice, because its content is overwritten
846 * by subsequent packets.
847 */
848 /* There must be a better way to do this next line... */
849 static struct route sro_fwd;
850 struct route *ro_fwd = &sro_fwd;
851
852#if 0
853 print_ip("IPFIREWALL_FORWARD: New dst ip: ",
854 dst->sin_addr, "\n");
855#endif
856
857 /*
858 * We need to figure out if we have been forwarded
f23061d4 859 * to a local socket. If so, then we should somehow
984263bc
MD
860 * "loop back" to ip_input, and get directed to the
861 * PCB as if we had received this packet. This is
862 * because it may be dificult to identify the packets
863 * you want to forward until they are being output
864 * and have selected an interface. (e.g. locally
865 * initiated packets) If we used the loopback inteface,
f23061d4 866 * we would not be able to control what happens
984263bc
MD
867 * as the packet runs through ip_input() as
868 * it is done through a ISR.
869 */
f23061d4
JH
870 LIST_FOREACH(ia, INADDR_HASH(dst->sin_addr.s_addr),
871 ia_hash) {
984263bc
MD
872 /*
873 * If the addr to forward to is one
874 * of ours, we pretend to
875 * be the destination for this packet.
876 */
877 if (IA_SIN(ia)->sin_addr.s_addr ==
878 dst->sin_addr.s_addr)
879 break;
880 }
f23061d4 881 if (ia != NULL) { /* tell ip_input "dont filter" */
984263bc
MD
882 struct m_hdr tag;
883
884 tag.mh_type = MT_TAG;
885 tag.mh_flags = PACKET_TAG_IPFORWARD;
886 tag.mh_data = (caddr_t)args.next_hop;
887 tag.mh_next = m;
888
889 if (m->m_pkthdr.rcvif == NULL)
890 m->m_pkthdr.rcvif = ifunit("lo0");
891 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
892 m->m_pkthdr.csum_flags |=
893 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
4f9a60e1 894 m->m_pkthdr.csum_data = 0xffff;
984263bc
MD
895 }
896 m->m_pkthdr.csum_flags |=
897 CSUM_IP_CHECKED | CSUM_IP_VALID;
898 ip->ip_len = htons(ip->ip_len);
899 ip->ip_off = htons(ip->ip_off);
4f277347 900 ip_input((struct mbuf *)&tag);
984263bc
MD
901 goto done;
902 }
f23061d4 903 /* Some of the logic for this was nicked from above.
984263bc
MD
904 *
905 * This rewrites the cached route in a local PCB.
906 * Is this what we want to do?
907 */
5fe66e68 908 bcopy(dst, &ro_fwd->ro_dst, sizeof *dst);
f23061d4 909 ro_fwd->ro_rt = NULL;
984263bc 910
5fe66e68 911 rtalloc_ign(ro_fwd, RTF_PRCLONING);
f23061d4 912 if (ro_fwd->ro_rt == NULL) {
984263bc
MD
913 ipstat.ips_noroute++;
914 error = EHOSTUNREACH;
915 goto bad;
916 }
917
918 ia = ifatoia(ro_fwd->ro_rt->rt_ifa);
919 ifp = ro_fwd->ro_rt->rt_ifp;
920 ro_fwd->ro_rt->rt_use++;
921 if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY)
922 dst = (struct sockaddr_in *)
5fe66e68 923 ro_fwd->ro_rt->rt_gateway;
984263bc
MD
924 if (ro_fwd->ro_rt->rt_flags & RTF_HOST)
925 isbroadcast =
926 (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
927 else
928 isbroadcast = in_broadcast(dst->sin_addr, ifp);
5fe66e68
JH
929 if (ro->ro_rt != NULL)
930 rtfree(ro->ro_rt);
984263bc
MD
931 ro->ro_rt = ro_fwd->ro_rt;
932 dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
933
934#endif /* ... block to be put into a function */
935 /*
936 * If we added a default src ip earlier,
937 * which would have been gotten from the-then
938 * interface, do it again, from the new one.
939 */
940 if (src_was_INADDR_ANY)
941 ip->ip_src = IA_SIN(ia)->sin_addr;
942 goto pass ;
943 }
944
f23061d4
JH
945 /*
946 * if we get here, none of the above matches, and
947 * we have to drop the pkt
948 */
984263bc 949 m_freem(m);
f23061d4
JH
950 error = EACCES; /* not sure this is the right error msg */
951 goto done;
984263bc
MD
952 }
953
954pass:
955 /* 127/8 must not appear on wire - RFC1122. */
956 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
957 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
f23061d4 958 if (!(ifp->if_flags & IFF_LOOPBACK)) {
984263bc
MD
959 ipstat.ips_badaddr++;
960 error = EADDRNOTAVAIL;
961 goto bad;
962 }
963 }
964
965 m->m_pkthdr.csum_flags |= CSUM_IP;
966 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
967 if (sw_csum & CSUM_DELAY_DATA) {
968 in_delayed_cksum(m);
969 sw_csum &= ~CSUM_DELAY_DATA;
970 }
971 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
972
973 /*
974 * If small enough for interface, or the interface will take
975 * care of the fragmentation for us, can just send directly.
976 */
7fb962be 977 if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) &&
f23061d4 978 !(ip->ip_off & IP_DF))) {
984263bc
MD
979 ip->ip_len = htons(ip->ip_len);
980 ip->ip_off = htons(ip->ip_off);
981 ip->ip_sum = 0;
982 if (sw_csum & CSUM_DELAY_IP) {
983 if (ip->ip_vhl == IP_VHL_BORING) {
984 ip->ip_sum = in_cksum_hdr(ip);
985 } else {
986 ip->ip_sum = in_cksum(m, hlen);
987 }
988 }
989
990 /* Record statistics for this interface address. */
991 if (!(flags & IP_FORWARDING) && ia) {
992 ia->ia_ifa.if_opackets++;
993 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
994 }
995
996#ifdef IPSEC
997 /* clean ipsec history once it goes out of the node */
998 ipsec_delaux(m);
999#endif
1000
1001#ifdef MBUF_STRESS_TEST
1002 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) {
1003 struct mbuf *m1, *m2;
1004 int length, tmp;
1005
1006 tmp = length = m->m_pkthdr.len;
1007
1008 while ((length -= mbuf_frag_size) >= 1) {
74f1caca 1009 m1 = m_split(m, length, MB_DONTWAIT);
984263bc
MD
1010 if (m1 == NULL)
1011 break;
984263bc
MD
1012 m2 = m;
1013 while (m2->m_next != NULL)
1014 m2 = m2->m_next;
1015 m2->m_next = m1;
1016 }
1017 m->m_pkthdr.len = tmp;
1018 }
1019#endif
9db4b353
SZ
1020 error = ifp->if_output(ifp, m, (struct sockaddr *)dst,
1021 ro->ro_rt);
984263bc
MD
1022 goto done;
1023 }
f1f552f6 1024
984263bc
MD
1025 if (ip->ip_off & IP_DF) {
1026 error = EMSGSIZE;
1027 /*
1028 * This case can happen if the user changed the MTU
1029 * of an interface after enabling IP on it. Because
1030 * most netifs don't keep track of routes pointing to
1031 * them, there is no way for one to update all its
1032 * routes when the MTU is changed.
1033 */
f1f552f6
JH
1034 if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) &&
1035 !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) &&
1036 (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
984263bc
MD
1037 ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
1038 }
1039 ipstat.ips_cantfrag++;
1040 goto bad;
1041 }
f1f552f6
JH
1042
1043 /*
1044 * Too large for interface; fragment if possible. If successful,
1045 * on return, m will point to a list of packets to be sent.
1046 */
1047 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, sw_csum);
1048 if (error)
984263bc 1049 goto bad;
f1f552f6
JH
1050 for (; m; m = m0) {
1051 m0 = m->m_nextpkt;
f23061d4 1052 m->m_nextpkt = NULL;
f1f552f6
JH
1053#ifdef IPSEC
1054 /* clean ipsec history once it goes out of the node */
1055 ipsec_delaux(m);
1056#endif
1057 if (error == 0) {
1058 /* Record statistics for this interface address. */
1059 if (ia != NULL) {
1060 ia->ia_ifa.if_opackets++;
1061 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
1062 }
9db4b353
SZ
1063 error = ifp->if_output(ifp, m, (struct sockaddr *)dst,
1064 ro->ro_rt);
78195a76 1065 } else {
f1f552f6 1066 m_freem(m);
78195a76 1067 }
984263bc
MD
1068 }
1069
f1f552f6
JH
1070 if (error == 0)
1071 ipstat.ips_fragmented++;
1072
1073done:
5fe66e68 1074 if (ro == &iproute && ro->ro_rt != NULL) {
f1f552f6
JH
1075 RTFREE(ro->ro_rt);
1076 ro->ro_rt = NULL;
1077 }
fade9ce3 1078#ifdef IPSEC
f1f552f6
JH
1079 if (sp != NULL) {
1080 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
a6ec04bc 1081 kprintf("DP ip_output call free SP:%p\n", sp));
f1f552f6
JH
1082 key_freesp(sp);
1083 }
1084#endif
1085#ifdef FAST_IPSEC
f1f552f6
JH
1086 if (sp != NULL)
1087 KEY_FREESP(&sp);
1088#endif
4c7020ad
SZ
1089 if (dn_mtag != NULL)
1090 m_tag_free(dn_mtag);
1091
f1f552f6
JH
1092 return (error);
1093bad:
1094 m_freem(m);
1095 goto done;
1096}
1097
1098/*
1099 * Create a chain of fragments which fit the given mtu. m_frag points to the
1100 * mbuf to be fragmented; on return it points to the chain with the fragments.
1101 * Return 0 if no error. If error, m_frag may contain a partially built
1102 * chain of fragments that should be freed by the caller.
1103 *
1104 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
1105 * sw_csum contains the delayed checksums flags (e.g., CSUM_DELAY_IP).
1106 */
1107int
1108ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
1109 u_long if_hwassist_flags, int sw_csum)
1110{
1111 int error = 0;
1112 int hlen = IP_VHL_HL(ip->ip_vhl) << 2;
1113 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
1114 int off;
1115 struct mbuf *m0 = *m_frag; /* the original packet */
1116 int firstlen;
1117 struct mbuf **mnext;
1118 int nfrags;
1119
1120 if (ip->ip_off & IP_DF) { /* Fragmentation not allowed */
1121 ipstat.ips_cantfrag++;
1122 return EMSGSIZE;
1123 }
1124
1125 /*
1126 * Must be able to put at least 8 bytes per fragment.
1127 */
1128 if (len < 8)
1129 return EMSGSIZE;
1130
984263bc 1131 /*
f1f552f6 1132 * If the interface will not calculate checksums on
984263bc
MD
1133 * fragmented packets, then do it here.
1134 */
f23061d4
JH
1135 if ((m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) &&
1136 !(if_hwassist_flags & CSUM_IP_FRAGS)) {
f1f552f6
JH
1137 in_delayed_cksum(m0);
1138 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
984263bc
MD
1139 }
1140
f1f552f6 1141 if (len > PAGE_SIZE) {
f23061d4
JH
1142 /*
1143 * Fragment large datagrams such that each segment
1144 * contains a multiple of PAGE_SIZE amount of data,
1145 * plus headers. This enables a receiver to perform
f1f552f6
JH
1146 * page-flipping zero-copy optimizations.
1147 *
1148 * XXX When does this help given that sender and receiver
1149 * could have different page sizes, and also mtu could
1150 * be less than the receiver's page size ?
1151 */
1152 int newlen;
1153 struct mbuf *m;
1154
1155 for (m = m0, off = 0; m && (off+m->m_len) <= mtu; m = m->m_next)
1156 off += m->m_len;
1157
1158 /*
f23061d4 1159 * firstlen (off - hlen) must be aligned on an
f1f552f6
JH
1160 * 8-byte boundary
1161 */
1162 if (off < hlen)
1163 goto smart_frag_failure;
1164 off = ((off - hlen) & ~7) + hlen;
1165 newlen = (~PAGE_MASK) & mtu;
5fe66e68 1166 if ((newlen + sizeof(struct ip)) > mtu) {
f1f552f6
JH
1167 /* we failed, go back the default */
1168smart_frag_failure:
1169 newlen = len;
1170 off = hlen + len;
1171 }
1172 len = newlen;
1173
1174 } else {
1175 off = hlen + len;
1176 }
1177
1178 firstlen = off - hlen;
1179 mnext = &m0->m_nextpkt; /* pointer to next packet */
984263bc
MD
1180
1181 /*
1182 * Loop through length of segment after first fragment,
1183 * make new header and copy data of each part and link onto chain.
f1f552f6
JH
1184 * Here, m0 is the original packet, m is the fragment being created.
1185 * The fragments are linked off the m_nextpkt of the original
1186 * packet, which after processing serves as the first fragment.
984263bc 1187 */
f1f552f6
JH
1188 for (nfrags = 1; off < ip->ip_len; off += len, nfrags++) {
1189 struct ip *mhip; /* ip header on the fragment */
1190 struct mbuf *m;
5fe66e68 1191 int mhlen = sizeof(struct ip);
f1f552f6 1192
74f1caca 1193 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
f23061d4 1194 if (m == NULL) {
984263bc
MD
1195 error = ENOBUFS;
1196 ipstat.ips_odropped++;
f1f552f6 1197 goto done;
984263bc
MD
1198 }
1199 m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
f1f552f6
JH
1200 /*
1201 * In the first mbuf, leave room for the link header, then
1202 * copy the original IP header including options. The payload
1203 * goes into an additional mbuf chain returned by m_copy().
1204 */
984263bc
MD
1205 m->m_data += max_linkhdr;
1206 mhip = mtod(m, struct ip *);
1207 *mhip = *ip;
5fe66e68
JH
1208 if (hlen > sizeof(struct ip)) {
1209 mhlen = ip_optcopy(ip, mhip) + sizeof(struct ip);
984263bc
MD
1210 mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
1211 }
1212 m->m_len = mhlen;
f1f552f6 1213 /* XXX do we need to add ip->ip_off below ? */
984263bc 1214 mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off;
f1f552f6
JH
1215 if (off + len >= ip->ip_len) { /* last fragment */
1216 len = ip->ip_len - off;
1217 m->m_flags |= M_LASTFRAG;
1218 } else
984263bc
MD
1219 mhip->ip_off |= IP_MF;
1220 mhip->ip_len = htons((u_short)(len + mhlen));
1221 m->m_next = m_copy(m0, off, len);
f23061d4 1222 if (m->m_next == NULL) { /* copy failed */
f1f552f6 1223 m_free(m);
984263bc
MD
1224 error = ENOBUFS; /* ??? */
1225 ipstat.ips_odropped++;
f1f552f6 1226 goto done;
984263bc
MD
1227 }
1228 m->m_pkthdr.len = mhlen + len;
f23061d4 1229 m->m_pkthdr.rcvif = (struct ifnet *)NULL;
984263bc
MD
1230 m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
1231 mhip->ip_off = htons(mhip->ip_off);
1232 mhip->ip_sum = 0;
f1f552f6
JH
1233 if (sw_csum & CSUM_DELAY_IP)
1234 mhip->ip_sum = in_cksum(m, mhlen);
984263bc
MD
1235 *mnext = m;
1236 mnext = &m->m_nextpkt;
984263bc
MD
1237 }
1238 ipstat.ips_ofragments += nfrags;
1239
f1f552f6 1240 /* set first marker for fragment chain */
984263bc
MD
1241 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
1242 m0->m_pkthdr.csum_data = nfrags;
1243
1244 /*
1245 * Update first fragment by trimming what's been copied out
f1f552f6 1246 * and updating header.
984263bc 1247 */
f1f552f6
JH
1248 m_adj(m0, hlen + firstlen - ip->ip_len);
1249 m0->m_pkthdr.len = hlen + firstlen;
1250 ip->ip_len = htons((u_short)m0->m_pkthdr.len);
984263bc
MD
1251 ip->ip_off |= IP_MF;
1252 ip->ip_off = htons(ip->ip_off);
1253 ip->ip_sum = 0;
f1f552f6
JH
1254 if (sw_csum & CSUM_DELAY_IP)
1255 ip->ip_sum = in_cksum(m0, hlen);
984263bc 1256
984263bc 1257done:
f1f552f6
JH
1258 *m_frag = m0;
1259 return error;
984263bc
MD
1260}
1261
1262void
1263in_delayed_cksum(struct mbuf *m)
1264{
1265 struct ip *ip;
1266 u_short csum, offset;
1267
1268 ip = mtod(m, struct ip *);
1269 offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
1270 csum = in_cksum_skip(m, ip->ip_len, offset);
1271 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
1272 csum = 0xffff;
1273 offset += m->m_pkthdr.csum_data; /* checksum offset */
1274
1275 if (offset + sizeof(u_short) > m->m_len) {
a6ec04bc 1276 kprintf("delayed m_pullup, m->len: %d off: %d p: %d\n",
984263bc
MD
1277 m->m_len, offset, ip->ip_p);
1278 /*
1279 * XXX
1280 * this shouldn't happen, but if it does, the
1281 * correct behavior may be to insert the checksum
1282 * in the existing chain instead of rearranging it.
1283 */
1284 m = m_pullup(m, offset + sizeof(u_short));
1285 }
1286 *(u_short *)(m->m_data + offset) = csum;
1287}
1288
1289/*
1290 * Insert IP options into preformed packet.
1291 * Adjust IP destination as required for IP source routing,
1292 * as indicated by a non-zero in_addr at the start of the options.
1293 *
1294 * XXX This routine assumes that the packet has no options in place.
1295 */
1296static struct mbuf *
5fe66e68 1297ip_insertoptions(struct mbuf *m, struct mbuf *opt, int *phlen)
984263bc 1298{
2256ba69 1299 struct ipoption *p = mtod(opt, struct ipoption *);
984263bc 1300 struct mbuf *n;
2256ba69 1301 struct ip *ip = mtod(m, struct ip *);
984263bc
MD
1302 unsigned optlen;
1303
5fe66e68 1304 optlen = opt->m_len - sizeof p->ipopt_dst;
984263bc
MD
1305 if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) {
1306 *phlen = 0;
1307 return (m); /* XXX should fail */
1308 }
1309 if (p->ipopt_dst.s_addr)
1310 ip->ip_dst = p->ipopt_dst;
1311 if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
74f1caca 1312 MGETHDR(n, MB_DONTWAIT, MT_HEADER);
f23061d4 1313 if (n == NULL) {
984263bc
MD
1314 *phlen = 0;
1315 return (m);
1316 }
f23061d4 1317 n->m_pkthdr.rcvif = (struct ifnet *)NULL;
984263bc
MD
1318 n->m_pkthdr.len = m->m_pkthdr.len + optlen;
1319 m->m_len -= sizeof(struct ip);
1320 m->m_data += sizeof(struct ip);
1321 n->m_next = m;
1322 m = n;
1323 m->m_len = optlen + sizeof(struct ip);
1324 m->m_data += max_linkhdr;
f23061d4 1325 memcpy(mtod(m, void *), ip, sizeof(struct ip));
984263bc
MD
1326 } else {
1327 m->m_data -= optlen;
1328 m->m_len += optlen;
1329 m->m_pkthdr.len += optlen;
f23061d4 1330 ovbcopy(ip, mtod(m, caddr_t), sizeof(struct ip));
984263bc
MD
1331 }
1332 ip = mtod(m, struct ip *);
1333 bcopy(p->ipopt_list, ip + 1, optlen);
1334 *phlen = sizeof(struct ip) + optlen;
1335 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
1336 ip->ip_len += optlen;
1337 return (m);
1338}
1339
1340/*
1341 * Copy options from ip to jp,
1342 * omitting those not copied during fragmentation.
1343 */
1344int
5fe66e68 1345ip_optcopy(struct ip *ip, struct ip *jp)
984263bc 1346{
2256ba69 1347 u_char *cp, *dp;
984263bc
MD
1348 int opt, optlen, cnt;
1349
1350 cp = (u_char *)(ip + 1);
1351 dp = (u_char *)(jp + 1);
5fe66e68 1352 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc
MD
1353 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1354 opt = cp[0];
1355 if (opt == IPOPT_EOL)
1356 break;
1357 if (opt == IPOPT_NOP) {
1358 /* Preserve for IP mcast tunnel's LSRR alignment. */
1359 *dp++ = IPOPT_NOP;
1360 optlen = 1;
1361 continue;
1362 }
1363
5fe66e68 1364 KASSERT(cnt >= IPOPT_OLEN + sizeof *cp,
984263bc
MD
1365 ("ip_optcopy: malformed ipv4 option"));
1366 optlen = cp[IPOPT_OLEN];
5fe66e68 1367 KASSERT(optlen >= IPOPT_OLEN + sizeof *cp && optlen <= cnt,
984263bc
MD
1368 ("ip_optcopy: malformed ipv4 option"));
1369
1370 /* bogus lengths should have been caught by ip_dooptions */
1371 if (optlen > cnt)
1372 optlen = cnt;
1373 if (IPOPT_COPIED(opt)) {
1374 bcopy(cp, dp, optlen);
1375 dp += optlen;
1376 }
1377 }
1378 for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
1379 *dp++ = IPOPT_EOL;
1380 return (optlen);
1381}
1382
1383/*
1384 * IP socket option processing.
1385 */
1386int
5fe66e68 1387ip_ctloutput(struct socket *so, struct sockopt *sopt)
984263bc 1388{
ed894f8c 1389 struct inpcb *inp = so->so_pcb;
984263bc
MD
1390 int error, optval;
1391
1392 error = optval = 0;
1393 if (sopt->sopt_level != IPPROTO_IP) {
1394 return (EINVAL);
1395 }
1396
1397 switch (sopt->sopt_dir) {
1398 case SOPT_SET:
1399 switch (sopt->sopt_name) {
1400 case IP_OPTIONS:
1401#ifdef notyet
1402 case IP_RETOPTS:
1403#endif
1404 {
1405 struct mbuf *m;
1406 if (sopt->sopt_valsize > MLEN) {
1407 error = EMSGSIZE;
1408 break;
1409 }
74f1caca 1410 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER);
f23061d4 1411 if (m == NULL) {
984263bc
MD
1412 error = ENOBUFS;
1413 break;
1414 }
1415 m->m_len = sopt->sopt_valsize;
1416 error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1417 m->m_len);
5fe66e68 1418
984263bc
MD
1419 return (ip_pcbopts(sopt->sopt_name, &inp->inp_options,
1420 m));
1421 }
1422
1423 case IP_TOS:
1424 case IP_TTL:
95926362 1425 case IP_MINTTL:
984263bc
MD
1426 case IP_RECVOPTS:
1427 case IP_RECVRETOPTS:
1428 case IP_RECVDSTADDR:
1429 case IP_RECVIF:
95926362 1430 case IP_RECVTTL:
984263bc
MD
1431 case IP_FAITH:
1432 error = sooptcopyin(sopt, &optval, sizeof optval,
1433 sizeof optval);
1434 if (error)
1435 break;
1436
1437 switch (sopt->sopt_name) {
1438 case IP_TOS:
1439 inp->inp_ip_tos = optval;
1440 break;
1441
1442 case IP_TTL:
1443 inp->inp_ip_ttl = optval;
1444 break;
95926362
MD
1445 case IP_MINTTL:
1446 if (optval > 0 && optval <= MAXTTL)
1447 inp->inp_ip_minttl = optval;
1448 else
1449 error = EINVAL;
1450 break;
984263bc
MD
1451#define OPTSET(bit) \
1452 if (optval) \
1453 inp->inp_flags |= bit; \
1454 else \
1455 inp->inp_flags &= ~bit;
1456
1457 case IP_RECVOPTS:
1458 OPTSET(INP_RECVOPTS);
1459 break;
1460
1461 case IP_RECVRETOPTS:
1462 OPTSET(INP_RECVRETOPTS);
1463 break;
1464
1465 case IP_RECVDSTADDR:
1466 OPTSET(INP_RECVDSTADDR);
1467 break;
1468
1469 case IP_RECVIF:
1470 OPTSET(INP_RECVIF);
1471 break;
1472
95926362
MD
1473 case IP_RECVTTL:
1474 OPTSET(INP_RECVTTL);
1475 break;
1476
984263bc
MD
1477 case IP_FAITH:
1478 OPTSET(INP_FAITH);
1479 break;
1480 }
1481 break;
1482#undef OPTSET
1483
1484 case IP_MULTICAST_IF:
1485 case IP_MULTICAST_VIF:
1486 case IP_MULTICAST_TTL:
1487 case IP_MULTICAST_LOOP:
1488 case IP_ADD_MEMBERSHIP:
1489 case IP_DROP_MEMBERSHIP:
1490 error = ip_setmoptions(sopt, &inp->inp_moptions);
1491 break;
1492
1493 case IP_PORTRANGE:
1494 error = sooptcopyin(sopt, &optval, sizeof optval,
1495 sizeof optval);
1496 if (error)
1497 break;
1498
1499 switch (optval) {
1500 case IP_PORTRANGE_DEFAULT:
1501 inp->inp_flags &= ~(INP_LOWPORT);
1502 inp->inp_flags &= ~(INP_HIGHPORT);
1503 break;
1504
1505 case IP_PORTRANGE_HIGH:
1506 inp->inp_flags &= ~(INP_LOWPORT);
1507 inp->inp_flags |= INP_HIGHPORT;
1508 break;
1509
1510 case IP_PORTRANGE_LOW:
1511 inp->inp_flags &= ~(INP_HIGHPORT);
1512 inp->inp_flags |= INP_LOWPORT;
1513 break;
1514
1515 default:
1516 error = EINVAL;
1517 break;
1518 }
1519 break;
1520
1521#if defined(IPSEC) || defined(FAST_IPSEC)
1522 case IP_IPSEC_POLICY:
1523 {
1524 caddr_t req;
1525 size_t len = 0;
1526 int priv;
1527 struct mbuf *m;
1528 int optname;
1529
1530 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1531 break;
1532 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1533 break;
7b95be2a
MD
1534 priv = (sopt->sopt_td != NULL &&
1535 suser(sopt->sopt_td) != 0) ? 0 : 1;
984263bc
MD
1536 req = mtod(m, caddr_t);
1537 len = m->m_len;
1538 optname = sopt->sopt_name;
1539 error = ipsec4_set_policy(inp, optname, req, len, priv);
1540 m_freem(m);
1541 break;
1542 }
1543#endif /*IPSEC*/
1544
1545 default:
1546 error = ENOPROTOOPT;
1547 break;
1548 }
1549 break;
1550
1551 case SOPT_GET:
1552 switch (sopt->sopt_name) {
1553 case IP_OPTIONS:
1554 case IP_RETOPTS:
1555 if (inp->inp_options)
f23061d4 1556 error = sooptcopyout(sopt,
984263bc
MD
1557 mtod(inp->inp_options,
1558 char *),
1559 inp->inp_options->m_len);
1560 else
1561 sopt->sopt_valsize = 0;
1562 break;
1563
1564 case IP_TOS:
1565 case IP_TTL:
95926362 1566 case IP_MINTTL:
984263bc
MD
1567 case IP_RECVOPTS:
1568 case IP_RECVRETOPTS:
1569 case IP_RECVDSTADDR:
95926362 1570 case IP_RECVTTL:
984263bc
MD
1571 case IP_RECVIF:
1572 case IP_PORTRANGE:
1573 case IP_FAITH:
1574 switch (sopt->sopt_name) {
1575
1576 case IP_TOS:
1577 optval = inp->inp_ip_tos;
1578 break;
1579
1580 case IP_TTL:
1581 optval = inp->inp_ip_ttl;
1582 break;
95926362
MD
1583 case IP_MINTTL:
1584 optval = inp->inp_ip_minttl;
1585 break;
984263bc
MD
1586
1587#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
1588
1589 case IP_RECVOPTS:
1590 optval = OPTBIT(INP_RECVOPTS);
1591 break;
1592
1593 case IP_RECVRETOPTS:
1594 optval = OPTBIT(INP_RECVRETOPTS);
1595 break;
1596
1597 case IP_RECVDSTADDR:
1598 optval = OPTBIT(INP_RECVDSTADDR);
1599 break;
1600
95926362
MD
1601 case IP_RECVTTL:
1602 optval = OPTBIT(INP_RECVTTL);
1603 break;
1604
984263bc
MD
1605 case IP_RECVIF:
1606 optval = OPTBIT(INP_RECVIF);
1607 break;
1608
1609 case IP_PORTRANGE:
1610 if (inp->inp_flags & INP_HIGHPORT)
1611 optval = IP_PORTRANGE_HIGH;
1612 else if (inp->inp_flags & INP_LOWPORT)
1613 optval = IP_PORTRANGE_LOW;
1614 else
1615 optval = 0;
1616 break;
1617
1618 case IP_FAITH:
1619 optval = OPTBIT(INP_FAITH);
1620 break;
1621 }
1622 error = sooptcopyout(sopt, &optval, sizeof optval);
1623 break;
1624
1625 case IP_MULTICAST_IF:
1626 case IP_MULTICAST_VIF:
1627 case IP_MULTICAST_TTL:
1628 case IP_MULTICAST_LOOP:
1629 case IP_ADD_MEMBERSHIP:
1630 case IP_DROP_MEMBERSHIP:
1631 error = ip_getmoptions(sopt, inp->inp_moptions);
1632 break;
1633
1634#if defined(IPSEC) || defined(FAST_IPSEC)
1635 case IP_IPSEC_POLICY:
1636 {
1637 struct mbuf *m = NULL;
1638 caddr_t req = NULL;
1639 size_t len = 0;
1640
f23061d4 1641 if (m != NULL) {
984263bc
MD
1642 req = mtod(m, caddr_t);
1643 len = m->m_len;
1644 }
ed894f8c 1645 error = ipsec4_get_policy(so->so_pcb, req, len, &m);
984263bc
MD
1646 if (error == 0)
1647 error = soopt_mcopyout(sopt, m); /* XXX */
1648 if (error == 0)
1649 m_freem(m);
1650 break;
1651 }
1652#endif /*IPSEC*/
1653
1654 default:
1655 error = ENOPROTOOPT;
1656 break;
1657 }
1658 break;
1659 }
1660 return (error);
1661}
1662
1663/*
1664 * Set up IP options in pcb for insertion in output packets.
1665 * Store in mbuf with pointer in pcbopt, adding pseudo-option
1666 * with destination address if source routed.
1667 */
1668static int
f23061d4 1669ip_pcbopts(int optname, struct mbuf **pcbopt, struct mbuf *m)
984263bc 1670{
2256ba69
RG
1671 int cnt, optlen;
1672 u_char *cp;
984263bc
MD
1673 u_char opt;
1674
1675 /* turn off any old options */
1676 if (*pcbopt)
f23061d4 1677 m_free(*pcbopt);
984263bc 1678 *pcbopt = 0;
f23061d4 1679 if (m == NULL || m->m_len == 0) {
984263bc
MD
1680 /*
1681 * Only turning off any previous options.
1682 */
f23061d4
JH
1683 if (m != NULL)
1684 m_free(m);
984263bc
MD
1685 return (0);
1686 }
1687
1688 if (m->m_len % sizeof(int32_t))
1689 goto bad;
1690 /*
1691 * IP first-hop destination address will be stored before
1692 * actual options; move other options back
1693 * and clear it when none present.
1694 */
1695 if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
1696 goto bad;
1697 cnt = m->m_len;
1698 m->m_len += sizeof(struct in_addr);
1699 cp = mtod(m, u_char *) + sizeof(struct in_addr);
f23061d4 1700 ovbcopy(mtod(m, caddr_t), cp, cnt);
984263bc
MD
1701 bzero(mtod(m, caddr_t), sizeof(struct in_addr));
1702
1703 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1704 opt = cp[IPOPT_OPTVAL];
1705 if (opt == IPOPT_EOL)
1706 break;
1707 if (opt == IPOPT_NOP)
1708 optlen = 1;
1709 else {
5fe66e68 1710 if (cnt < IPOPT_OLEN + sizeof *cp)
984263bc
MD
1711 goto bad;
1712 optlen = cp[IPOPT_OLEN];
5fe66e68 1713 if (optlen < IPOPT_OLEN + sizeof *cp || optlen > cnt)
984263bc
MD
1714 goto bad;
1715 }
1716 switch (opt) {
1717
1718 default:
1719 break;
1720
1721 case IPOPT_LSRR:
1722 case IPOPT_SSRR:
1723 /*
1724 * user process specifies route as:
1725 * ->A->B->C->D
1726 * D must be our final destination (but we can't
1727 * check that since we may not have connected yet).
1728 * A is first hop destination, which doesn't appear in
1729 * actual IP option, but is stored before the options.
1730 */
1731 if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
1732 goto bad;
1733 m->m_len -= sizeof(struct in_addr);
1734 cnt -= sizeof(struct in_addr);
1735 optlen -= sizeof(struct in_addr);
1736 cp[IPOPT_OLEN] = optlen;
1737 /*
1738 * Move first hop before start of options.
1739 */
f23061d4 1740 bcopy(&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
5fe66e68 1741 sizeof(struct in_addr));
984263bc
MD
1742 /*
1743 * Then copy rest of options back
1744 * to close up the deleted entry.
1745 */
f23061d4
JH
1746 ovbcopy(&cp[IPOPT_OFFSET+1] + sizeof(struct in_addr),
1747 &cp[IPOPT_OFFSET+1],
1748 cnt - (IPOPT_MINOFF - 1));
984263bc
MD
1749 break;
1750 }
1751 }
1752 if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
1753 goto bad;
1754 *pcbopt = m;
1755 return (0);
1756
1757bad:
f23061d4 1758 m_free(m);
984263bc
MD
1759 return (EINVAL);
1760}
1761
1762/*
1763 * XXX
1764 * The whole multicast option thing needs to be re-thought.
1765 * Several of these options are equally applicable to non-multicast
1766 * transmission, and one (IP_MULTICAST_TTL) totally duplicates a
1767 * standard option (IP_TTL).
1768 */
1769
1770/*
1771 * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index.
1772 */
1773static struct ifnet *
f23061d4 1774ip_multicast_if(struct in_addr *a, int *ifindexp)
984263bc
MD
1775{
1776 int ifindex;
1777 struct ifnet *ifp;
1778
1779 if (ifindexp)
1780 *ifindexp = 0;
1781 if (ntohl(a->s_addr) >> 24 == 0) {
1782 ifindex = ntohl(a->s_addr) & 0xffffff;
1783 if (ifindex < 0 || if_index < ifindex)
1784 return NULL;
1785 ifp = ifindex2ifnet[ifindex];
1786 if (ifindexp)
1787 *ifindexp = ifindex;
1788 } else {
1789 INADDR_TO_IFP(*a, ifp);
1790 }
1791 return ifp;
1792}
1793
1794/*
1795 * Set the IP multicast options in response to user setsockopt().
1796 */
1797static int
f23061d4 1798ip_setmoptions(struct sockopt *sopt, struct ip_moptions **imop)
984263bc
MD
1799{
1800 int error = 0;
1801 int i;
1802 struct in_addr addr;
1803 struct ip_mreq mreq;
1804 struct ifnet *ifp;
1805 struct ip_moptions *imo = *imop;
984263bc 1806 int ifindex;
984263bc
MD
1807
1808 if (imo == NULL) {
1809 /*
1810 * No multicast option buffer attached to the pcb;
1811 * allocate one and initialize to default values.
1812 */
efda3bd0 1813 imo = kmalloc(sizeof *imo, M_IPMOPTS, M_WAITOK);
984263bc 1814
984263bc
MD
1815 *imop = imo;
1816 imo->imo_multicast_ifp = NULL;
1817 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1818 imo->imo_multicast_vif = -1;
1819 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
1820 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
1821 imo->imo_num_memberships = 0;
1822 }
1823
1824 switch (sopt->sopt_name) {
1825 /* store an index number for the vif you wanna use in the send */
1826 case IP_MULTICAST_VIF:
1827 if (legal_vif_num == 0) {
1828 error = EOPNOTSUPP;
1829 break;
1830 }
1831 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
1832 if (error)
1833 break;
1834 if (!legal_vif_num(i) && (i != -1)) {
1835 error = EINVAL;
1836 break;
1837 }
1838 imo->imo_multicast_vif = i;
1839 break;
1840
1841 case IP_MULTICAST_IF:
1842 /*
1843 * Select the interface for outgoing multicast packets.
1844 */
1845 error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr);
1846 if (error)
1847 break;
1848 /*
1849 * INADDR_ANY is used to remove a previous selection.
1850 * When no interface is selected, a default one is
1851 * chosen every time a multicast packet is sent.
1852 */
1853 if (addr.s_addr == INADDR_ANY) {
1854 imo->imo_multicast_ifp = NULL;
1855 break;
1856 }
1857 /*
1858 * The selected interface is identified by its local
1859 * IP address. Find the interface and confirm that
1860 * it supports multicasting.
1861 */
1cae611f 1862 crit_enter();
984263bc 1863 ifp = ip_multicast_if(&addr, &ifindex);
f23061d4 1864 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) {
1cae611f 1865 crit_exit();
984263bc
MD
1866 error = EADDRNOTAVAIL;
1867 break;
1868 }
1869 imo->imo_multicast_ifp = ifp;
1870 if (ifindex)
1871 imo->imo_multicast_addr = addr;
1872 else
1873 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1cae611f 1874 crit_exit();
984263bc
MD
1875 break;
1876
1877 case IP_MULTICAST_TTL:
1878 /*
1879 * Set the IP time-to-live for outgoing multicast packets.
1880 * The original multicast API required a char argument,
1881 * which is inconsistent with the rest of the socket API.
1882 * We allow either a char or an int.
1883 */
1884 if (sopt->sopt_valsize == 1) {
1885 u_char ttl;
1886 error = sooptcopyin(sopt, &ttl, 1, 1);
1887 if (error)
1888 break;
1889 imo->imo_multicast_ttl = ttl;
1890 } else {
1891 u_int ttl;
5fe66e68 1892 error = sooptcopyin(sopt, &ttl, sizeof ttl, sizeof ttl);
984263bc
MD
1893 if (error)
1894 break;
1895 if (ttl > 255)
1896 error = EINVAL;
1897 else
1898 imo->imo_multicast_ttl = ttl;
1899 }
1900 break;
1901
1902 case IP_MULTICAST_LOOP:
1903 /*
1904 * Set the loopback flag for outgoing multicast packets.
1905 * Must be zero or one. The original multicast API required a
1906 * char argument, which is inconsistent with the rest
1907 * of the socket API. We allow either a char or an int.
1908 */
1909 if (sopt->sopt_valsize == 1) {
1910 u_char loop;
5fe66e68 1911
984263bc
MD
1912 error = sooptcopyin(sopt, &loop, 1, 1);
1913 if (error)
1914 break;
1915 imo->imo_multicast_loop = !!loop;
1916 } else {
1917 u_int loop;
5fe66e68 1918
984263bc
MD
1919 error = sooptcopyin(sopt, &loop, sizeof loop,
1920 sizeof loop);
1921 if (error)
1922 break;
1923 imo->imo_multicast_loop = !!loop;
1924 }
1925 break;
1926
1927 case IP_ADD_MEMBERSHIP:
1928 /*
1929 * Add a multicast group membership.
1930 * Group must be a valid IP multicast address.
1931 */
1932 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
1933 if (error)
1934 break;
1935
1936 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
1937 error = EINVAL;
1938 break;
1939 }
1cae611f 1940 crit_enter();
984263bc
MD
1941 /*
1942 * If no interface address was provided, use the interface of
1943 * the route to the given multicast address.
1944 */
1945 if (mreq.imr_interface.s_addr == INADDR_ANY) {
1ce00f4f
JH
1946 struct sockaddr_in dst;
1947 struct rtentry *rt;
1948
1949 bzero(&dst, sizeof(struct sockaddr_in));
1950 dst.sin_len = sizeof(struct sockaddr_in);
1951 dst.sin_family = AF_INET;
1952 dst.sin_addr = mreq.imr_multiaddr;
1953 rt = rtlookup((struct sockaddr *)&dst);
1954 if (rt == NULL) {
984263bc 1955 error = EADDRNOTAVAIL;
1cae611f 1956 crit_exit();
984263bc
MD
1957 break;
1958 }
1ce00f4f
JH
1959 --rt->rt_refcnt;
1960 ifp = rt->rt_ifp;
1961 } else {
984263bc
MD
1962 ifp = ip_multicast_if(&mreq.imr_interface, NULL);
1963 }
1964
1965 /*
1966 * See if we found an interface, and confirm that it
1967 * supports multicast.
1968 */
f23061d4 1969 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) {
984263bc 1970 error = EADDRNOTAVAIL;
1cae611f 1971 crit_exit();
984263bc
MD
1972 break;
1973 }
1974 /*
1975 * See if the membership already exists or if all the
1976 * membership slots are full.
1977 */
1978 for (i = 0; i < imo->imo_num_memberships; ++i) {
1979 if (imo->imo_membership[i]->inm_ifp == ifp &&
1980 imo->imo_membership[i]->inm_addr.s_addr
1981 == mreq.imr_multiaddr.s_addr)
1982 break;
1983 }
1984 if (i < imo->imo_num_memberships) {
1985 error = EADDRINUSE;
1cae611f 1986 crit_exit();
984263bc
MD
1987 break;
1988 }
1989 if (i == IP_MAX_MEMBERSHIPS) {
1990 error = ETOOMANYREFS;
1cae611f 1991 crit_exit();
984263bc
MD
1992 break;
1993 }
1994 /*
1995 * Everything looks good; add a new record to the multicast
1996 * address list for the given interface.
1997 */
1998 if ((imo->imo_membership[i] =
5fe66e68 1999 in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
984263bc 2000 error = ENOBUFS;
1cae611f 2001 crit_exit();
984263bc
MD
2002 break;
2003 }
2004 ++imo->imo_num_memberships;
1cae611f 2005 crit_exit();
984263bc
MD
2006 break;
2007
2008 case IP_DROP_MEMBERSHIP:
2009 /*
2010 * Drop a multicast group membership.
2011 * Group must be a valid IP multicast address.
2012 */
2013 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
2014 if (error)
2015 break;
2016
2017 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
2018 error = EINVAL;
2019 break;
2020 }
2021
1cae611f 2022 crit_enter();
984263bc
MD
2023 /*
2024 * If an interface address was specified, get a pointer
2025 * to its ifnet structure.
2026 */
2027 if (mreq.imr_interface.s_addr == INADDR_ANY)
2028 ifp = NULL;
2029 else {
2030 ifp = ip_multicast_if(&mreq.imr_interface, NULL);
2031 if (ifp == NULL) {
2032 error = EADDRNOTAVAIL;
1cae611f 2033 crit_exit();
984263bc
MD
2034 break;
2035 }
2036 }
2037 /*
2038 * Find the membership in the membership array.
2039 */
2040 for (i = 0; i < imo->imo_num_memberships; ++i) {
2041 if ((ifp == NULL ||
2042 imo->imo_membership[i]->inm_ifp == ifp) &&
5fe66e68
JH
2043 imo->imo_membership[i]->inm_addr.s_addr ==
2044 mreq.imr_multiaddr.s_addr)
984263bc
MD
2045 break;
2046 }
2047 if (i == imo->imo_num_memberships) {
2048 error = EADDRNOTAVAIL;
1cae611f 2049 crit_exit();
984263bc
MD
2050 break;
2051 }
2052 /*
2053 * Give up the multicast address record to which the
2054 * membership points.
2055 */
2056 in_delmulti(imo->imo_membership[i]);
2057 /*
2058 * Remove the gap in the membership array.
2059 */
2060 for (++i; i < imo->imo_num_memberships; ++i)
2061 imo->imo_membership[i-1] = imo->imo_membership[i];
2062 --imo->imo_num_memberships;
1cae611f 2063 crit_exit();
984263bc
MD
2064 break;
2065
2066 default:
2067 error = EOPNOTSUPP;
2068 break;
2069 }
2070
2071 /*
2072 * If all options have default values, no need to keep the mbuf.
2073 */
2074 if (imo->imo_multicast_ifp == NULL &&
2075 imo->imo_multicast_vif == -1 &&
2076 imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
2077 imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
2078 imo->imo_num_memberships == 0) {
efda3bd0 2079 kfree(*imop, M_IPMOPTS);
984263bc
MD
2080 *imop = NULL;
2081 }
2082
2083 return (error);
2084}
2085
2086/*
2087 * Return the IP multicast options in response to user getsockopt().
2088 */
2089static int
f23061d4 2090ip_getmoptions(struct sockopt *sopt, struct ip_moptions *imo)
984263bc
MD
2091{
2092 struct in_addr addr;
2093 struct in_ifaddr *ia;
2094 int error, optval;
2095 u_char coptval;
2096
2097 error = 0;
2098 switch (sopt->sopt_name) {
f23061d4 2099 case IP_MULTICAST_VIF:
984263bc
MD
2100 if (imo != NULL)
2101 optval = imo->imo_multicast_vif;
2102 else
2103 optval = -1;
2104 error = sooptcopyout(sopt, &optval, sizeof optval);
2105 break;
2106
2107 case IP_MULTICAST_IF:
2108 if (imo == NULL || imo->imo_multicast_ifp == NULL)
2109 addr.s_addr = INADDR_ANY;
2110 else if (imo->imo_multicast_addr.s_addr) {
2111 /* return the value user has set */
2112 addr = imo->imo_multicast_addr;
2113 } else {
1b562c24 2114 ia = IFP_TO_IA(imo->imo_multicast_ifp);
984263bc
MD
2115 addr.s_addr = (ia == NULL) ? INADDR_ANY
2116 : IA_SIN(ia)->sin_addr.s_addr;
2117 }
2118 error = sooptcopyout(sopt, &addr, sizeof addr);
2119 break;
2120
2121 case IP_MULTICAST_TTL:
f23061d4 2122 if (imo == NULL)
984263bc
MD
2123 optval = coptval = IP_DEFAULT_MULTICAST_TTL;
2124 else
2125 optval = coptval = imo->imo_multicast_ttl;
2126 if (sopt->sopt_valsize == 1)
2127 error = sooptcopyout(sopt, &coptval, 1);
2128 else
2129 error = sooptcopyout(sopt, &optval, sizeof optval);
2130 break;
2131
2132 case IP_MULTICAST_LOOP:
f23061d4 2133 if (imo == NULL)
984263bc
MD
2134 optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
2135 else
2136 optval = coptval = imo->imo_multicast_loop;
2137 if (sopt->sopt_valsize == 1)
2138 error = sooptcopyout(sopt, &coptval, 1);
2139 else
2140 error = sooptcopyout(sopt, &optval, sizeof optval);
2141 break;
2142
2143 default:
2144 error = ENOPROTOOPT;
2145 break;
2146 }
2147 return (error);
2148}
2149
2150/*
2151 * Discard the IP multicast options.
2152 */
2153void
f23061d4 2154ip_freemoptions(struct ip_moptions *imo)
984263bc 2155{
2256ba69 2156 int i;
984263bc
MD
2157
2158 if (imo != NULL) {
2159 for (i = 0; i < imo->imo_num_memberships; ++i)
2160 in_delmulti(imo->imo_membership[i]);
efda3bd0 2161 kfree(imo, M_IPMOPTS);
984263bc
MD
2162 }
2163}
2164
2165/*
2166 * Routine called from ip_output() to loop back a copy of an IP multicast
2167 * packet to the input queue of a specified interface. Note that this
2168 * calls the output routine of the loopback "driver", but with an interface
2169 * pointer that might NOT be a loopback interface -- evil, but easier than
2170 * replicating that code here.
2171 */
2172static void
5fe66e68
JH
2173ip_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in *dst,
2174 int hlen)
984263bc 2175{
2256ba69 2176 struct ip *ip;
984263bc
MD
2177 struct mbuf *copym;
2178
f23061d4 2179 copym = m_copypacket(m, MB_DONTWAIT);
984263bc
MD
2180 if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
2181 copym = m_pullup(copym, hlen);
2182 if (copym != NULL) {
f23061d4 2183 /*
7db7d2da
MD
2184 * if the checksum hasn't been computed, mark it as valid
2185 */
2186 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2187 in_delayed_cksum(copym);
2188 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2189 copym->m_pkthdr.csum_flags |=
2190 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
2191 copym->m_pkthdr.csum_data = 0xffff;
2192 }
984263bc
MD
2193 /*
2194 * We don't bother to fragment if the IP length is greater
2195 * than the interface's MTU. Can this possibly matter?
2196 */
2197 ip = mtod(copym, struct ip *);
2198 ip->ip_len = htons(ip->ip_len);
2199 ip->ip_off = htons(ip->ip_off);
2200 ip->ip_sum = 0;
2201 if (ip->ip_vhl == IP_VHL_BORING) {
2202 ip->ip_sum = in_cksum_hdr(ip);
2203 } else {
2204 ip->ip_sum = in_cksum(copym, hlen);
2205 }
2206 /*
2207 * NB:
2208 * It's not clear whether there are any lingering
2209 * reentrancy problems in other areas which might
2210 * be exposed by using ip_input directly (in
2211 * particular, everything which modifies the packet
2212 * in-place). Yet another option is using the
2213 * protosw directly to deliver the looped back
2214 * packet. For the moment, we'll err on the side
2215 * of safety by using if_simloop().
2216 */
2217#if 1 /* XXX */
2218 if (dst->sin_family != AF_INET) {
a6ec04bc 2219 kprintf("ip_mloopback: bad address family %d\n",
984263bc
MD
2220 dst->sin_family);
2221 dst->sin_family = AF_INET;
2222 }
2223#endif
2224
2225#ifdef notdef
2226 copym->m_pkthdr.rcvif = ifp;
2227 ip_input(copym);
2228#else
984263bc
MD
2229 if_simloop(ifp, copym, dst->sin_family, 0);
2230#endif
2231 }
2232}