1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1988, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include "opt_inet.h"
38 #include "opt_ipsec.h"
39 #include "opt_kern_tls.h"
40 #include "opt_mbuf_stress_test.h"
41 #include "opt_ratelimit.h"
42 #include "opt_route.h"
43 #include "opt_rss.h"
44 #include "opt_sctp.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/ktls.h>
50 #include <sys/lock.h>
51 #include <sys/malloc.h>
52 #include <sys/mbuf.h>
53 #include <sys/priv.h>
54 #include <sys/proc.h>
55 #include <sys/protosw.h>
56 #include <sys/rmlock.h>
57 #include <sys/sdt.h>
58 #include <sys/socket.h>
59 #include <sys/socketvar.h>
60 #include <sys/sysctl.h>
61 #include <sys/ucred.h>
62
63 #include <net/if.h>
64 #include <net/if_var.h>
65 #include <net/if_vlan_var.h>
66 #include <net/if_llatbl.h>
67 #include <net/ethernet.h>
68 #include <net/netisr.h>
69 #include <net/pfil.h>
70 #include <net/route.h>
71 #include <net/route/nhop.h>
72 #include <net/rss_config.h>
73 #include <net/vnet.h>
74
75 #include <netinet/in.h>
76 #include <netinet/in_fib.h>
77 #include <netinet/in_kdtrace.h>
78 #include <netinet/in_systm.h>
79 #include <netinet/ip.h>
80 #include <netinet/in_fib.h>
81 #include <netinet/in_pcb.h>
82 #include <netinet/in_rss.h>
83 #include <netinet/in_var.h>
84 #include <netinet/ip_var.h>
85 #include <netinet/ip_options.h>
86
87 #include <netinet/udp.h>
88 #include <netinet/udp_var.h>
89
90 #if defined(SCTP) || defined(SCTP_SUPPORT)
91 #include <netinet/sctp.h>
92 #include <netinet/sctp_crc32.h>
93 #endif
94
95 #include <netipsec/ipsec_support.h>
96
97 #include <machine/in_cksum.h>
98
99 #include <security/mac/mac_framework.h>
100
101 #ifdef MBUF_STRESS_TEST
102 static int mbuf_frag_size = 0;
103 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
104 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
105 #endif
106
107 static void ip_mloopback(struct ifnet *, const struct mbuf *, int);
108
109 extern int in_mcast_loop;
110 extern struct protosw inetsw[];
111
112 static inline int
ip_output_pfil(struct mbuf ** mp,struct ifnet * ifp,int flags,struct inpcb * inp,struct sockaddr_in * dst,int * fibnum,int * error)113 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags,
114 struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error)
115 {
116 struct m_tag *fwd_tag = NULL;
117 struct mbuf *m;
118 struct in_addr odst;
119 struct ip *ip;
120 int pflags = PFIL_OUT;
121
122 if (flags & IP_FORWARDING)
123 pflags |= PFIL_FWD;
124
125 m = *mp;
126 ip = mtod(m, struct ip *);
127
128 /* Run through list of hooks for output packets. */
129 odst.s_addr = ip->ip_dst.s_addr;
130 switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, pflags, inp)) {
131 case PFIL_DROPPED:
132 *error = EACCES;
133 /* FALLTHROUGH */
134 case PFIL_CONSUMED:
135 return 1; /* Finished */
136 case PFIL_PASS:
137 *error = 0;
138 }
139 m = *mp;
140 ip = mtod(m, struct ip *);
141
142 /* See if destination IP address was changed by packet filter. */
143 if (odst.s_addr != ip->ip_dst.s_addr) {
144 m->m_flags |= M_SKIP_FIREWALL;
145 /* If destination is now ourself drop to ip_input(). */
146 if (in_localip(ip->ip_dst)) {
147 m->m_flags |= M_FASTFWD_OURS;
148 if (m->m_pkthdr.rcvif == NULL)
149 m->m_pkthdr.rcvif = V_loif;
150 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
151 m->m_pkthdr.csum_flags |=
152 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
153 m->m_pkthdr.csum_data = 0xffff;
154 }
155 m->m_pkthdr.csum_flags |=
156 CSUM_IP_CHECKED | CSUM_IP_VALID;
157 #if defined(SCTP) || defined(SCTP_SUPPORT)
158 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
159 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
160 #endif
161 *error = netisr_queue(NETISR_IP, m);
162 return 1; /* Finished */
163 }
164
165 bzero(dst, sizeof(*dst));
166 dst->sin_family = AF_INET;
167 dst->sin_len = sizeof(*dst);
168 dst->sin_addr = ip->ip_dst;
169
170 return -1; /* Reloop */
171 }
172 /* See if fib was changed by packet filter. */
173 if ((*fibnum) != M_GETFIB(m)) {
174 m->m_flags |= M_SKIP_FIREWALL;
175 *fibnum = M_GETFIB(m);
176 return -1; /* Reloop for FIB change */
177 }
178
179 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
180 if (m->m_flags & M_FASTFWD_OURS) {
181 if (m->m_pkthdr.rcvif == NULL)
182 m->m_pkthdr.rcvif = V_loif;
183 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
184 m->m_pkthdr.csum_flags |=
185 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
186 m->m_pkthdr.csum_data = 0xffff;
187 }
188 #if defined(SCTP) || defined(SCTP_SUPPORT)
189 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
190 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
191 #endif
192 m->m_pkthdr.csum_flags |=
193 CSUM_IP_CHECKED | CSUM_IP_VALID;
194
195 *error = netisr_queue(NETISR_IP, m);
196 return 1; /* Finished */
197 }
198 /* Or forward to some other address? */
199 if ((m->m_flags & M_IP_NEXTHOP) &&
200 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
201 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
202 m->m_flags |= M_SKIP_FIREWALL;
203 m->m_flags &= ~M_IP_NEXTHOP;
204 m_tag_delete(m, fwd_tag);
205
206 return -1; /* Reloop for CHANGE of dst */
207 }
208
209 return 0;
210 }
211
212 static int
ip_output_send(struct inpcb * inp,struct ifnet * ifp,struct mbuf * m,const struct sockaddr_in * gw,struct route * ro,bool stamp_tag)213 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m,
214 const struct sockaddr_in *gw, struct route *ro, bool stamp_tag)
215 {
216 #ifdef KERN_TLS
217 struct ktls_session *tls = NULL;
218 #endif
219 struct m_snd_tag *mst;
220 int error;
221
222 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
223 mst = NULL;
224
225 #ifdef KERN_TLS
226 /*
227 * If this is an unencrypted TLS record, save a reference to
228 * the record. This local reference is used to call
229 * ktls_output_eagain after the mbuf has been freed (thus
230 * dropping the mbuf's reference) in if_output.
231 */
232 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
233 tls = ktls_hold(m->m_next->m_epg_tls);
234 mst = tls->snd_tag;
235
236 /*
237 * If a TLS session doesn't have a valid tag, it must
238 * have had an earlier ifp mismatch, so drop this
239 * packet.
240 */
241 if (mst == NULL) {
242 error = EAGAIN;
243 goto done;
244 }
245 /*
246 * Always stamp tags that include NIC ktls.
247 */
248 stamp_tag = true;
249 }
250 #endif
251 #ifdef RATELIMIT
252 if (inp != NULL && mst == NULL) {
253 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
254 (inp->inp_snd_tag != NULL &&
255 inp->inp_snd_tag->ifp != ifp))
256 in_pcboutput_txrtlmt(inp, ifp, m);
257
258 if (inp->inp_snd_tag != NULL)
259 mst = inp->inp_snd_tag;
260 }
261 #endif
262 if (stamp_tag && mst != NULL) {
263 KASSERT(m->m_pkthdr.rcvif == NULL,
264 ("trying to add a send tag to a forwarded packet"));
265 if (mst->ifp != ifp) {
266 error = EAGAIN;
267 goto done;
268 }
269
270 /* stamp send tag on mbuf */
271 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
272 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
273 }
274
275 error = (*ifp->if_output)(ifp, m, (const struct sockaddr *)gw, ro);
276
277 done:
278 /* Check for route change invalidating send tags. */
279 #ifdef KERN_TLS
280 if (tls != NULL) {
281 if (error == EAGAIN)
282 error = ktls_output_eagain(inp, tls);
283 ktls_free(tls);
284 }
285 #endif
286 #ifdef RATELIMIT
287 if (error == EAGAIN)
288 in_pcboutput_eagain(inp);
289 #endif
290 return (error);
291 }
292
293 /* rte<>ro_flags translation */
294 static inline void
rt_update_ro_flags(struct route * ro)295 rt_update_ro_flags(struct route *ro)
296 {
297 int nh_flags = ro->ro_nh->nh_flags;
298
299 ro->ro_flags &= ~ (RT_REJECT|RT_BLACKHOLE|RT_HAS_GW);
300
301 ro->ro_flags |= (nh_flags & NHF_REJECT) ? RT_REJECT : 0;
302 ro->ro_flags |= (nh_flags & NHF_BLACKHOLE) ? RT_BLACKHOLE : 0;
303 ro->ro_flags |= (nh_flags & NHF_GATEWAY) ? RT_HAS_GW : 0;
304 }
305
306 /*
307 * IP output. The packet in mbuf chain m contains a skeletal IP
308 * header (with len, off, ttl, proto, tos, src, dst).
309 * The mbuf chain containing the packet will be freed.
310 * The mbuf opt, if present, will not be freed.
311 * If route ro is present and has ro_rt initialized, route lookup would be
312 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
313 * then result of route lookup is stored in ro->ro_rt.
314 *
315 * In the IP forwarding case, the packet will arrive with options already
316 * inserted, so must have a NULL opt pointer.
317 */
318 int
ip_output(struct mbuf * m,struct mbuf * opt,struct route * ro,int flags,struct ip_moptions * imo,struct inpcb * inp)319 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
320 struct ip_moptions *imo, struct inpcb *inp)
321 {
322 struct rm_priotracker in_ifa_tracker;
323 struct ip *ip;
324 struct ifnet *ifp = NULL; /* keep compiler happy */
325 struct mbuf *m0;
326 int hlen = sizeof (struct ip);
327 int mtu = 0;
328 int error = 0;
329 int vlan_pcp = -1;
330 struct sockaddr_in *dst, sin;
331 const struct sockaddr_in *gw;
332 struct in_ifaddr *ia = NULL;
333 struct in_addr src;
334 int isbroadcast;
335 uint16_t ip_len, ip_off;
336 uint32_t fibnum;
337 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
338 int no_route_but_check_spd = 0;
339 #endif
340
341 M_ASSERTPKTHDR(m);
342 NET_EPOCH_ASSERT();
343
344 if (inp != NULL) {
345 INP_LOCK_ASSERT(inp);
346 M_SETFIB(m, inp->inp_inc.inc_fibnum);
347 if ((flags & IP_NODEFAULTFLOWID) == 0) {
348 m->m_pkthdr.flowid = inp->inp_flowid;
349 M_HASHTYPE_SET(m, inp->inp_flowtype);
350 }
351 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
352 vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
353 INP_2PCP_SHIFT;
354 #ifdef NUMA
355 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
356 #endif
357 }
358
359 if (opt) {
360 int len = 0;
361 m = ip_insertoptions(m, opt, &len);
362 if (len != 0)
363 hlen = len; /* ip->ip_hl is updated above */
364 }
365 ip = mtod(m, struct ip *);
366 ip_len = ntohs(ip->ip_len);
367 ip_off = ntohs(ip->ip_off);
368
369 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
370 ip->ip_v = IPVERSION;
371 ip->ip_hl = hlen >> 2;
372 ip_fillid(ip);
373 } else {
374 /* Header already set, fetch hlen from there */
375 hlen = ip->ip_hl << 2;
376 }
377 if ((flags & IP_FORWARDING) == 0)
378 IPSTAT_INC(ips_localout);
379
380 /*
381 * dst/gw handling:
382 *
383 * gw is readonly but can point either to dst OR rt_gateway,
384 * therefore we need restore gw if we're redoing lookup.
385 */
386 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
387 if (ro != NULL)
388 dst = (struct sockaddr_in *)&ro->ro_dst;
389 else
390 dst = &sin;
391 if (ro == NULL || ro->ro_nh == NULL) {
392 bzero(dst, sizeof(*dst));
393 dst->sin_family = AF_INET;
394 dst->sin_len = sizeof(*dst);
395 dst->sin_addr = ip->ip_dst;
396 }
397 gw = dst;
398 again:
399 /*
400 * Validate route against routing table additions;
401 * a better/more specific route might have been added.
402 */
403 if (inp != NULL && ro != NULL && ro->ro_nh != NULL)
404 NH_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
405 /*
406 * If there is a cached route,
407 * check that it is to the same destination
408 * and is still up. If not, free it and try again.
409 * The address family should also be checked in case of sharing the
410 * cache with IPv6.
411 * Also check whether routing cache needs invalidation.
412 */
413 if (ro != NULL && ro->ro_nh != NULL &&
414 ((!NH_IS_VALID(ro->ro_nh)) || dst->sin_family != AF_INET ||
415 dst->sin_addr.s_addr != ip->ip_dst.s_addr))
416 RO_INVALIDATE_CACHE(ro);
417 ia = NULL;
418 /*
419 * If routing to interface only, short circuit routing lookup.
420 * The use of an all-ones broadcast address implies this; an
421 * interface is specified by the broadcast address of an interface,
422 * or the destination address of a ptp interface.
423 */
424 if (flags & IP_SENDONES) {
425 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
426 M_GETFIB(m)))) == NULL &&
427 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
428 M_GETFIB(m)))) == NULL) {
429 IPSTAT_INC(ips_noroute);
430 error = ENETUNREACH;
431 goto bad;
432 }
433 ip->ip_dst.s_addr = INADDR_BROADCAST;
434 dst->sin_addr = ip->ip_dst;
435 ifp = ia->ia_ifp;
436 mtu = ifp->if_mtu;
437 ip->ip_ttl = 1;
438 isbroadcast = 1;
439 src = IA_SIN(ia)->sin_addr;
440 } else if (flags & IP_ROUTETOIF) {
441 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
442 M_GETFIB(m)))) == NULL &&
443 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
444 M_GETFIB(m)))) == NULL) {
445 IPSTAT_INC(ips_noroute);
446 error = ENETUNREACH;
447 goto bad;
448 }
449 ifp = ia->ia_ifp;
450 mtu = ifp->if_mtu;
451 ip->ip_ttl = 1;
452 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
453 in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
454 src = IA_SIN(ia)->sin_addr;
455 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
456 imo != NULL && imo->imo_multicast_ifp != NULL) {
457 /*
458 * Bypass the normal routing lookup for multicast
459 * packets if the interface is specified.
460 */
461 ifp = imo->imo_multicast_ifp;
462 mtu = ifp->if_mtu;
463 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
464 isbroadcast = 0; /* fool gcc */
465 /* Interface may have no addresses. */
466 if (ia != NULL)
467 src = IA_SIN(ia)->sin_addr;
468 else
469 src.s_addr = INADDR_ANY;
470 } else if (ro != NULL) {
471 if (ro->ro_nh == NULL) {
472 /*
473 * We want to do any cloning requested by the link
474 * layer, as this is probably required in all cases
475 * for correct operation (as it is for ARP).
476 */
477 uint32_t flowid;
478 flowid = m->m_pkthdr.flowid;
479 ro->ro_nh = fib4_lookup(fibnum, dst->sin_addr, 0,
480 NHR_REF, flowid);
481
482 if (ro->ro_nh == NULL || (!NH_IS_VALID(ro->ro_nh))) {
483 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
484 /*
485 * There is no route for this packet, but it is
486 * possible that a matching SPD entry exists.
487 */
488 no_route_but_check_spd = 1;
489 goto sendit;
490 #endif
491 IPSTAT_INC(ips_noroute);
492 error = EHOSTUNREACH;
493 goto bad;
494 }
495 }
496 ia = ifatoia(ro->ro_nh->nh_ifa);
497 ifp = ro->ro_nh->nh_ifp;
498 counter_u64_add(ro->ro_nh->nh_pksent, 1);
499 rt_update_ro_flags(ro);
500 if (ro->ro_nh->nh_flags & NHF_GATEWAY)
501 gw = &ro->ro_nh->gw4_sa;
502 if (ro->ro_nh->nh_flags & NHF_HOST)
503 isbroadcast = (ro->ro_nh->nh_flags & NHF_BROADCAST);
504 else if (ifp->if_flags & IFF_BROADCAST)
505 isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
506 else
507 isbroadcast = 0;
508 if (ro->ro_nh->nh_flags & NHF_HOST)
509 mtu = ro->ro_nh->nh_mtu;
510 else
511 mtu = ifp->if_mtu;
512 src = IA_SIN(ia)->sin_addr;
513 } else {
514 struct nhop_object *nh;
515
516 nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_NONE,
517 m->m_pkthdr.flowid);
518 if (nh == NULL) {
519 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
520 /*
521 * There is no route for this packet, but it is
522 * possible that a matching SPD entry exists.
523 */
524 no_route_but_check_spd = 1;
525 goto sendit;
526 #endif
527 IPSTAT_INC(ips_noroute);
528 error = EHOSTUNREACH;
529 goto bad;
530 }
531 ifp = nh->nh_ifp;
532 mtu = nh->nh_mtu;
533 /*
534 * We are rewriting here dst to be gw actually, contradicting
535 * comment at the beginning of the function. However, in this
536 * case we are always dealing with on stack dst.
537 * In case if pfil(9) sends us back to beginning of the
538 * function, the dst would be rewritten by ip_output_pfil().
539 */
540 MPASS(dst == &sin);
541 if (nh->nh_flags & NHF_GATEWAY)
542 dst->sin_addr = nh->gw4_sa.sin_addr;
543 ia = ifatoia(nh->nh_ifa);
544 src = IA_SIN(ia)->sin_addr;
545 isbroadcast = (((nh->nh_flags & (NHF_HOST | NHF_BROADCAST)) ==
546 (NHF_HOST | NHF_BROADCAST)) ||
547 ((ifp->if_flags & IFF_BROADCAST) &&
548 in_ifaddr_broadcast(dst->sin_addr, ia)));
549 }
550
551 /* Catch a possible divide by zero later. */
552 KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (nh_flags=0x%08x) ifp=%p",
553 __func__, mtu, ro,
554 (ro != NULL && ro->ro_nh != NULL) ? ro->ro_nh->nh_flags : 0, ifp));
555
556 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
557 m->m_flags |= M_MCAST;
558 /*
559 * IP destination address is multicast. Make sure "gw"
560 * still points to the address in "ro". (It may have been
561 * changed to point to a gateway address, above.)
562 */
563 gw = dst;
564 /*
565 * See if the caller provided any multicast options
566 */
567 if (imo != NULL) {
568 ip->ip_ttl = imo->imo_multicast_ttl;
569 if (imo->imo_multicast_vif != -1)
570 ip->ip_src.s_addr =
571 ip_mcast_src ?
572 ip_mcast_src(imo->imo_multicast_vif) :
573 INADDR_ANY;
574 } else
575 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
576 /*
577 * Confirm that the outgoing interface supports multicast.
578 */
579 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
580 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
581 IPSTAT_INC(ips_noroute);
582 error = ENETUNREACH;
583 goto bad;
584 }
585 }
586 /*
587 * If source address not specified yet, use address
588 * of outgoing interface.
589 */
590 if (ip->ip_src.s_addr == INADDR_ANY)
591 ip->ip_src = src;
592
593 if ((imo == NULL && in_mcast_loop) ||
594 (imo && imo->imo_multicast_loop)) {
595 /*
596 * Loop back multicast datagram if not expressly
597 * forbidden to do so, even if we are not a member
598 * of the group; ip_input() will filter it later,
599 * thus deferring a hash lookup and mutex acquisition
600 * at the expense of a cheap copy using m_copym().
601 */
602 ip_mloopback(ifp, m, hlen);
603 } else {
604 /*
605 * If we are acting as a multicast router, perform
606 * multicast forwarding as if the packet had just
607 * arrived on the interface to which we are about
608 * to send. The multicast forwarding function
609 * recursively calls this function, using the
610 * IP_FORWARDING flag to prevent infinite recursion.
611 *
612 * Multicasts that are looped back by ip_mloopback(),
613 * above, will be forwarded by the ip_input() routine,
614 * if necessary.
615 */
616 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
617 /*
618 * If rsvp daemon is not running, do not
619 * set ip_moptions. This ensures that the packet
620 * is multicast and not just sent down one link
621 * as prescribed by rsvpd.
622 */
623 if (!V_rsvp_on)
624 imo = NULL;
625 if (ip_mforward &&
626 ip_mforward(ip, ifp, m, imo) != 0) {
627 m_freem(m);
628 goto done;
629 }
630 }
631 }
632
633 /*
634 * Multicasts with a time-to-live of zero may be looped-
635 * back, above, but must not be transmitted on a network.
636 * Also, multicasts addressed to the loopback interface
637 * are not sent -- the above call to ip_mloopback() will
638 * loop back a copy. ip_input() will drop the copy if
639 * this host does not belong to the destination group on
640 * the loopback interface.
641 */
642 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
643 m_freem(m);
644 goto done;
645 }
646
647 goto sendit;
648 }
649
650 /*
651 * If the source address is not specified yet, use the address
652 * of the outoing interface.
653 */
654 if (ip->ip_src.s_addr == INADDR_ANY)
655 ip->ip_src = src;
656
657 /*
658 * Look for broadcast address and
659 * verify user is allowed to send
660 * such a packet.
661 */
662 if (isbroadcast) {
663 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
664 error = EADDRNOTAVAIL;
665 goto bad;
666 }
667 if ((flags & IP_ALLOWBROADCAST) == 0) {
668 error = EACCES;
669 goto bad;
670 }
671 /* don't allow broadcast messages to be fragmented */
672 if (ip_len > mtu) {
673 error = EMSGSIZE;
674 goto bad;
675 }
676 m->m_flags |= M_BCAST;
677 } else {
678 m->m_flags &= ~M_BCAST;
679 }
680
681 sendit:
682 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
683 if (IPSEC_ENABLED(ipv4)) {
684 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
685 if (error == EINPROGRESS)
686 error = 0;
687 goto done;
688 }
689 }
690 /*
691 * Check if there was a route for this packet; return error if not.
692 */
693 if (no_route_but_check_spd) {
694 IPSTAT_INC(ips_noroute);
695 error = EHOSTUNREACH;
696 goto bad;
697 }
698 /* Update variables that are affected by ipsec4_output(). */
699 ip = mtod(m, struct ip *);
700 hlen = ip->ip_hl << 2;
701 #endif /* IPSEC */
702
703 /* Jump over all PFIL processing if hooks are not active. */
704 if (PFIL_HOOKED_OUT(V_inet_pfil_head)) {
705 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum,
706 &error)) {
707 case 1: /* Finished */
708 goto done;
709
710 case 0: /* Continue normally */
711 ip = mtod(m, struct ip *);
712 break;
713
714 case -1: /* Need to try again */
715 /* Reset everything for a new round */
716 if (ro != NULL) {
717 RO_NHFREE(ro);
718 ro->ro_prepend = NULL;
719 }
720 gw = dst;
721 ip = mtod(m, struct ip *);
722 goto again;
723 }
724 }
725
726 if (vlan_pcp > -1)
727 EVL_APPLY_PRI(m, vlan_pcp);
728
729 /* IN_LOOPBACK must not appear on the wire - RFC1122. */
730 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
731 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
732 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
733 IPSTAT_INC(ips_badaddr);
734 error = EADDRNOTAVAIL;
735 goto bad;
736 }
737 }
738
739 m->m_pkthdr.csum_flags |= CSUM_IP;
740 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
741 m = mb_unmapped_to_ext(m);
742 if (m == NULL) {
743 IPSTAT_INC(ips_odropped);
744 error = ENOBUFS;
745 goto bad;
746 }
747 in_delayed_cksum(m);
748 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
749 } else if ((ifp->if_capenable & IFCAP_NOMAP) == 0) {
750 m = mb_unmapped_to_ext(m);
751 if (m == NULL) {
752 IPSTAT_INC(ips_odropped);
753 error = ENOBUFS;
754 goto bad;
755 }
756 }
757 #if defined(SCTP) || defined(SCTP_SUPPORT)
758 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
759 m = mb_unmapped_to_ext(m);
760 if (m == NULL) {
761 IPSTAT_INC(ips_odropped);
762 error = ENOBUFS;
763 goto bad;
764 }
765 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
766 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
767 }
768 #endif
769
770 /*
771 * If small enough for interface, or the interface will take
772 * care of the fragmentation for us, we can just send directly.
773 * Note that if_vxlan could have requested TSO even though the outer
774 * frame is UDP. It is correct to not fragment such datagrams and
775 * instead just pass them on to the driver.
776 */
777 if (ip_len <= mtu ||
778 (m->m_pkthdr.csum_flags & ifp->if_hwassist &
779 (CSUM_TSO | CSUM_INNER_TSO)) != 0) {
780 ip->ip_sum = 0;
781 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
782 ip->ip_sum = in_cksum(m, hlen);
783 m->m_pkthdr.csum_flags &= ~CSUM_IP;
784 }
785
786 /*
787 * Record statistics for this interface address.
788 * With CSUM_TSO the byte/packet count will be slightly
789 * incorrect because we count the IP+TCP headers only
790 * once instead of for every generated packet.
791 */
792 if (!(flags & IP_FORWARDING) && ia) {
793 if (m->m_pkthdr.csum_flags &
794 (CSUM_TSO | CSUM_INNER_TSO))
795 counter_u64_add(ia->ia_ifa.ifa_opackets,
796 m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
797 else
798 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
799
800 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
801 }
802 #ifdef MBUF_STRESS_TEST
803 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
804 m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
805 #endif
806 /*
807 * Reset layer specific mbuf flags
808 * to avoid confusing lower layers.
809 */
810 m_clrprotoflags(m);
811 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
812 error = ip_output_send(inp, ifp, m, gw, ro,
813 (flags & IP_NO_SND_TAG_RL) ? false : true);
814 goto done;
815 }
816
817 /* Balk when DF bit is set or the interface didn't support TSO. */
818 if ((ip_off & IP_DF) ||
819 (m->m_pkthdr.csum_flags & (CSUM_TSO | CSUM_INNER_TSO))) {
820 error = EMSGSIZE;
821 IPSTAT_INC(ips_cantfrag);
822 goto bad;
823 }
824
825 /*
826 * Too large for interface; fragment if possible. If successful,
827 * on return, m will point to a list of packets to be sent.
828 */
829 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
830 if (error)
831 goto bad;
832 for (; m; m = m0) {
833 m0 = m->m_nextpkt;
834 m->m_nextpkt = 0;
835 if (error == 0) {
836 /* Record statistics for this interface address. */
837 if (ia != NULL) {
838 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
839 counter_u64_add(ia->ia_ifa.ifa_obytes,
840 m->m_pkthdr.len);
841 }
842 /*
843 * Reset layer specific mbuf flags
844 * to avoid confusing upper layers.
845 */
846 m_clrprotoflags(m);
847
848 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
849 mtod(m, struct ip *), NULL);
850 error = ip_output_send(inp, ifp, m, gw, ro, true);
851 } else
852 m_freem(m);
853 }
854
855 if (error == 0)
856 IPSTAT_INC(ips_fragmented);
857
858 done:
859 return (error);
860 bad:
861 m_freem(m);
862 goto done;
863 }
864
865 /*
866 * Create a chain of fragments which fit the given mtu. m_frag points to the
867 * mbuf to be fragmented; on return it points to the chain with the fragments.
868 * Return 0 if no error. If error, m_frag may contain a partially built
869 * chain of fragments that should be freed by the caller.
870 *
871 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
872 */
873 int
ip_fragment(struct ip * ip,struct mbuf ** m_frag,int mtu,u_long if_hwassist_flags)874 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
875 u_long if_hwassist_flags)
876 {
877 int error = 0;
878 int hlen = ip->ip_hl << 2;
879 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
880 int off;
881 struct mbuf *m0 = *m_frag; /* the original packet */
882 int firstlen;
883 struct mbuf **mnext;
884 int nfrags;
885 uint16_t ip_len, ip_off;
886
887 ip_len = ntohs(ip->ip_len);
888 ip_off = ntohs(ip->ip_off);
889
890 if (ip_off & IP_DF) { /* Fragmentation not allowed */
891 IPSTAT_INC(ips_cantfrag);
892 return EMSGSIZE;
893 }
894
895 /*
896 * Must be able to put at least 8 bytes per fragment.
897 */
898 if (len < 8)
899 return EMSGSIZE;
900
901 /*
902 * If the interface will not calculate checksums on
903 * fragmented packets, then do it here.
904 */
905 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
906 m0 = mb_unmapped_to_ext(m0);
907 if (m0 == NULL) {
908 error = ENOBUFS;
909 IPSTAT_INC(ips_odropped);
910 goto done;
911 }
912 in_delayed_cksum(m0);
913 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
914 }
915 #if defined(SCTP) || defined(SCTP_SUPPORT)
916 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
917 m0 = mb_unmapped_to_ext(m0);
918 if (m0 == NULL) {
919 error = ENOBUFS;
920 IPSTAT_INC(ips_odropped);
921 goto done;
922 }
923 sctp_delayed_cksum(m0, hlen);
924 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
925 }
926 #endif
927 if (len > PAGE_SIZE) {
928 /*
929 * Fragment large datagrams such that each segment
930 * contains a multiple of PAGE_SIZE amount of data,
931 * plus headers. This enables a receiver to perform
932 * page-flipping zero-copy optimizations.
933 *
934 * XXX When does this help given that sender and receiver
935 * could have different page sizes, and also mtu could
936 * be less than the receiver's page size ?
937 */
938 int newlen;
939
940 off = MIN(mtu, m0->m_pkthdr.len);
941
942 /*
943 * firstlen (off - hlen) must be aligned on an
944 * 8-byte boundary
945 */
946 if (off < hlen)
947 goto smart_frag_failure;
948 off = ((off - hlen) & ~7) + hlen;
949 newlen = (~PAGE_MASK) & mtu;
950 if ((newlen + sizeof (struct ip)) > mtu) {
951 /* we failed, go back the default */
952 smart_frag_failure:
953 newlen = len;
954 off = hlen + len;
955 }
956 len = newlen;
957
958 } else {
959 off = hlen + len;
960 }
961
962 firstlen = off - hlen;
963 mnext = &m0->m_nextpkt; /* pointer to next packet */
964
965 /*
966 * Loop through length of segment after first fragment,
967 * make new header and copy data of each part and link onto chain.
968 * Here, m0 is the original packet, m is the fragment being created.
969 * The fragments are linked off the m_nextpkt of the original
970 * packet, which after processing serves as the first fragment.
971 */
972 for (nfrags = 1; off < ip_len; off += len, nfrags++) {
973 struct ip *mhip; /* ip header on the fragment */
974 struct mbuf *m;
975 int mhlen = sizeof (struct ip);
976
977 m = m_gethdr(M_NOWAIT, MT_DATA);
978 if (m == NULL) {
979 error = ENOBUFS;
980 IPSTAT_INC(ips_odropped);
981 goto done;
982 }
983 /*
984 * Make sure the complete packet header gets copied
985 * from the originating mbuf to the newly created
986 * mbuf. This also ensures that existing firewall
987 * classification(s), VLAN tags and so on get copied
988 * to the resulting fragmented packet(s):
989 */
990 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
991 m_free(m);
992 error = ENOBUFS;
993 IPSTAT_INC(ips_odropped);
994 goto done;
995 }
996 /*
997 * In the first mbuf, leave room for the link header, then
998 * copy the original IP header including options. The payload
999 * goes into an additional mbuf chain returned by m_copym().
1000 */
1001 m->m_data += max_linkhdr;
1002 mhip = mtod(m, struct ip *);
1003 *mhip = *ip;
1004 if (hlen > sizeof (struct ip)) {
1005 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
1006 mhip->ip_v = IPVERSION;
1007 mhip->ip_hl = mhlen >> 2;
1008 }
1009 m->m_len = mhlen;
1010 /* XXX do we need to add ip_off below ? */
1011 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
1012 if (off + len >= ip_len)
1013 len = ip_len - off;
1014 else
1015 mhip->ip_off |= IP_MF;
1016 mhip->ip_len = htons((u_short)(len + mhlen));
1017 m->m_next = m_copym(m0, off, len, M_NOWAIT);
1018 if (m->m_next == NULL) { /* copy failed */
1019 m_free(m);
1020 error = ENOBUFS; /* ??? */
1021 IPSTAT_INC(ips_odropped);
1022 goto done;
1023 }
1024 m->m_pkthdr.len = mhlen + len;
1025 #ifdef MAC
1026 mac_netinet_fragment(m0, m);
1027 #endif
1028 mhip->ip_off = htons(mhip->ip_off);
1029 mhip->ip_sum = 0;
1030 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1031 mhip->ip_sum = in_cksum(m, mhlen);
1032 m->m_pkthdr.csum_flags &= ~CSUM_IP;
1033 }
1034 *mnext = m;
1035 mnext = &m->m_nextpkt;
1036 }
1037 IPSTAT_ADD(ips_ofragments, nfrags);
1038
1039 /*
1040 * Update first fragment by trimming what's been copied out
1041 * and updating header.
1042 */
1043 m_adj(m0, hlen + firstlen - ip_len);
1044 m0->m_pkthdr.len = hlen + firstlen;
1045 ip->ip_len = htons((u_short)m0->m_pkthdr.len);
1046 ip->ip_off = htons(ip_off | IP_MF);
1047 ip->ip_sum = 0;
1048 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1049 ip->ip_sum = in_cksum(m0, hlen);
1050 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
1051 }
1052
1053 done:
1054 *m_frag = m0;
1055 return error;
1056 }
1057
1058 void
in_delayed_cksum(struct mbuf * m)1059 in_delayed_cksum(struct mbuf *m)
1060 {
1061 struct ip *ip;
1062 struct udphdr *uh;
1063 uint16_t cklen, csum, offset;
1064
1065 ip = mtod(m, struct ip *);
1066 offset = ip->ip_hl << 2 ;
1067
1068 if (m->m_pkthdr.csum_flags & CSUM_UDP) {
1069 /* if udp header is not in the first mbuf copy udplen */
1070 if (offset + sizeof(struct udphdr) > m->m_len) {
1071 m_copydata(m, offset + offsetof(struct udphdr,
1072 uh_ulen), sizeof(cklen), (caddr_t)&cklen);
1073 cklen = ntohs(cklen);
1074 } else {
1075 uh = (struct udphdr *)mtodo(m, offset);
1076 cklen = ntohs(uh->uh_ulen);
1077 }
1078 csum = in_cksum_skip(m, cklen + offset, offset);
1079 if (csum == 0)
1080 csum = 0xffff;
1081 } else {
1082 cklen = ntohs(ip->ip_len);
1083 csum = in_cksum_skip(m, cklen, offset);
1084 }
1085 offset += m->m_pkthdr.csum_data; /* checksum offset */
1086
1087 if (offset + sizeof(csum) > m->m_len)
1088 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
1089 else
1090 *(u_short *)mtodo(m, offset) = csum;
1091 }
1092
1093 /*
1094 * IP socket option processing.
1095 */
1096 int
ip_ctloutput(struct socket * so,struct sockopt * sopt)1097 ip_ctloutput(struct socket *so, struct sockopt *sopt)
1098 {
1099 struct inpcb *inp = sotoinpcb(so);
1100 int error, optval;
1101 #ifdef RSS
1102 uint32_t rss_bucket;
1103 int retval;
1104 #endif
1105
1106 error = optval = 0;
1107 if (sopt->sopt_level != IPPROTO_IP) {
1108 error = EINVAL;
1109
1110 if (sopt->sopt_level == SOL_SOCKET &&
1111 sopt->sopt_dir == SOPT_SET) {
1112 switch (sopt->sopt_name) {
1113 case SO_REUSEADDR:
1114 INP_WLOCK(inp);
1115 if ((so->so_options & SO_REUSEADDR) != 0)
1116 inp->inp_flags2 |= INP_REUSEADDR;
1117 else
1118 inp->inp_flags2 &= ~INP_REUSEADDR;
1119 INP_WUNLOCK(inp);
1120 error = 0;
1121 break;
1122 case SO_REUSEPORT:
1123 INP_WLOCK(inp);
1124 if ((so->so_options & SO_REUSEPORT) != 0)
1125 inp->inp_flags2 |= INP_REUSEPORT;
1126 else
1127 inp->inp_flags2 &= ~INP_REUSEPORT;
1128 INP_WUNLOCK(inp);
1129 error = 0;
1130 break;
1131 case SO_REUSEPORT_LB:
1132 INP_WLOCK(inp);
1133 if ((so->so_options & SO_REUSEPORT_LB) != 0)
1134 inp->inp_flags2 |= INP_REUSEPORT_LB;
1135 else
1136 inp->inp_flags2 &= ~INP_REUSEPORT_LB;
1137 INP_WUNLOCK(inp);
1138 error = 0;
1139 break;
1140 case SO_SETFIB:
1141 INP_WLOCK(inp);
1142 inp->inp_inc.inc_fibnum = so->so_fibnum;
1143 INP_WUNLOCK(inp);
1144 error = 0;
1145 break;
1146 case SO_MAX_PACING_RATE:
1147 #ifdef RATELIMIT
1148 INP_WLOCK(inp);
1149 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1150 INP_WUNLOCK(inp);
1151 error = 0;
1152 #else
1153 error = EOPNOTSUPP;
1154 #endif
1155 break;
1156 default:
1157 break;
1158 }
1159 }
1160 return (error);
1161 }
1162
1163 switch (sopt->sopt_dir) {
1164 case SOPT_SET:
1165 switch (sopt->sopt_name) {
1166 case IP_OPTIONS:
1167 #ifdef notyet
1168 case IP_RETOPTS:
1169 #endif
1170 {
1171 struct mbuf *m;
1172 if (sopt->sopt_valsize > MLEN) {
1173 error = EMSGSIZE;
1174 break;
1175 }
1176 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1177 if (m == NULL) {
1178 error = ENOBUFS;
1179 break;
1180 }
1181 m->m_len = sopt->sopt_valsize;
1182 error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1183 m->m_len);
1184 if (error) {
1185 m_free(m);
1186 break;
1187 }
1188 INP_WLOCK(inp);
1189 error = ip_pcbopts(inp, sopt->sopt_name, m);
1190 INP_WUNLOCK(inp);
1191 return (error);
1192 }
1193
1194 case IP_BINDANY:
1195 if (sopt->sopt_td != NULL) {
1196 error = priv_check(sopt->sopt_td,
1197 PRIV_NETINET_BINDANY);
1198 if (error)
1199 break;
1200 }
1201 /* FALLTHROUGH */
1202 case IP_BINDMULTI:
1203 #ifdef RSS
1204 case IP_RSS_LISTEN_BUCKET:
1205 #endif
1206 case IP_TOS:
1207 case IP_TTL:
1208 case IP_MINTTL:
1209 case IP_RECVOPTS:
1210 case IP_RECVRETOPTS:
1211 case IP_ORIGDSTADDR:
1212 case IP_RECVDSTADDR:
1213 case IP_RECVTTL:
1214 case IP_RECVIF:
1215 case IP_ONESBCAST:
1216 case IP_DONTFRAG:
1217 case IP_RECVTOS:
1218 case IP_RECVFLOWID:
1219 #ifdef RSS
1220 case IP_RECVRSSBUCKETID:
1221 #endif
1222 case IP_VLAN_PCP:
1223 error = sooptcopyin(sopt, &optval, sizeof optval,
1224 sizeof optval);
1225 if (error)
1226 break;
1227
1228 switch (sopt->sopt_name) {
1229 case IP_TOS:
1230 inp->inp_ip_tos = optval;
1231 break;
1232
1233 case IP_TTL:
1234 inp->inp_ip_ttl = optval;
1235 break;
1236
1237 case IP_MINTTL:
1238 if (optval >= 0 && optval <= MAXTTL)
1239 inp->inp_ip_minttl = optval;
1240 else
1241 error = EINVAL;
1242 break;
1243
1244 #define OPTSET(bit) do { \
1245 INP_WLOCK(inp); \
1246 if (optval) \
1247 inp->inp_flags |= bit; \
1248 else \
1249 inp->inp_flags &= ~bit; \
1250 INP_WUNLOCK(inp); \
1251 } while (0)
1252
1253 #define OPTSET2(bit, val) do { \
1254 INP_WLOCK(inp); \
1255 if (val) \
1256 inp->inp_flags2 |= bit; \
1257 else \
1258 inp->inp_flags2 &= ~bit; \
1259 INP_WUNLOCK(inp); \
1260 } while (0)
1261
1262 case IP_RECVOPTS:
1263 OPTSET(INP_RECVOPTS);
1264 break;
1265
1266 case IP_RECVRETOPTS:
1267 OPTSET(INP_RECVRETOPTS);
1268 break;
1269
1270 case IP_RECVDSTADDR:
1271 OPTSET(INP_RECVDSTADDR);
1272 break;
1273
1274 case IP_ORIGDSTADDR:
1275 OPTSET2(INP_ORIGDSTADDR, optval);
1276 break;
1277
1278 case IP_RECVTTL:
1279 OPTSET(INP_RECVTTL);
1280 break;
1281
1282 case IP_RECVIF:
1283 OPTSET(INP_RECVIF);
1284 break;
1285
1286 case IP_ONESBCAST:
1287 OPTSET(INP_ONESBCAST);
1288 break;
1289 case IP_DONTFRAG:
1290 OPTSET(INP_DONTFRAG);
1291 break;
1292 case IP_BINDANY:
1293 OPTSET(INP_BINDANY);
1294 break;
1295 case IP_RECVTOS:
1296 OPTSET(INP_RECVTOS);
1297 break;
1298 case IP_BINDMULTI:
1299 OPTSET2(INP_BINDMULTI, optval);
1300 break;
1301 case IP_RECVFLOWID:
1302 OPTSET2(INP_RECVFLOWID, optval);
1303 break;
1304 #ifdef RSS
1305 case IP_RSS_LISTEN_BUCKET:
1306 if ((optval >= 0) &&
1307 (optval < rss_getnumbuckets())) {
1308 inp->inp_rss_listen_bucket = optval;
1309 OPTSET2(INP_RSS_BUCKET_SET, 1);
1310 } else {
1311 error = EINVAL;
1312 }
1313 break;
1314 case IP_RECVRSSBUCKETID:
1315 OPTSET2(INP_RECVRSSBUCKETID, optval);
1316 break;
1317 #endif
1318 case IP_VLAN_PCP:
1319 if ((optval >= -1) && (optval <=
1320 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1321 if (optval == -1) {
1322 INP_WLOCK(inp);
1323 inp->inp_flags2 &=
1324 ~(INP_2PCP_SET |
1325 INP_2PCP_MASK);
1326 INP_WUNLOCK(inp);
1327 } else {
1328 INP_WLOCK(inp);
1329 inp->inp_flags2 |=
1330 INP_2PCP_SET;
1331 inp->inp_flags2 &=
1332 ~INP_2PCP_MASK;
1333 inp->inp_flags2 |=
1334 optval << INP_2PCP_SHIFT;
1335 INP_WUNLOCK(inp);
1336 }
1337 } else
1338 error = EINVAL;
1339 break;
1340 }
1341 break;
1342 #undef OPTSET
1343 #undef OPTSET2
1344
1345 /*
1346 * Multicast socket options are processed by the in_mcast
1347 * module.
1348 */
1349 case IP_MULTICAST_IF:
1350 case IP_MULTICAST_VIF:
1351 case IP_MULTICAST_TTL:
1352 case IP_MULTICAST_LOOP:
1353 case IP_ADD_MEMBERSHIP:
1354 case IP_DROP_MEMBERSHIP:
1355 case IP_ADD_SOURCE_MEMBERSHIP:
1356 case IP_DROP_SOURCE_MEMBERSHIP:
1357 case IP_BLOCK_SOURCE:
1358 case IP_UNBLOCK_SOURCE:
1359 case IP_MSFILTER:
1360 case MCAST_JOIN_GROUP:
1361 case MCAST_LEAVE_GROUP:
1362 case MCAST_JOIN_SOURCE_GROUP:
1363 case MCAST_LEAVE_SOURCE_GROUP:
1364 case MCAST_BLOCK_SOURCE:
1365 case MCAST_UNBLOCK_SOURCE:
1366 error = inp_setmoptions(inp, sopt);
1367 break;
1368
1369 case IP_PORTRANGE:
1370 error = sooptcopyin(sopt, &optval, sizeof optval,
1371 sizeof optval);
1372 if (error)
1373 break;
1374
1375 INP_WLOCK(inp);
1376 switch (optval) {
1377 case IP_PORTRANGE_DEFAULT:
1378 inp->inp_flags &= ~(INP_LOWPORT);
1379 inp->inp_flags &= ~(INP_HIGHPORT);
1380 break;
1381
1382 case IP_PORTRANGE_HIGH:
1383 inp->inp_flags &= ~(INP_LOWPORT);
1384 inp->inp_flags |= INP_HIGHPORT;
1385 break;
1386
1387 case IP_PORTRANGE_LOW:
1388 inp->inp_flags &= ~(INP_HIGHPORT);
1389 inp->inp_flags |= INP_LOWPORT;
1390 break;
1391
1392 default:
1393 error = EINVAL;
1394 break;
1395 }
1396 INP_WUNLOCK(inp);
1397 break;
1398
1399 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1400 case IP_IPSEC_POLICY:
1401 if (IPSEC_ENABLED(ipv4)) {
1402 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1403 break;
1404 }
1405 /* FALLTHROUGH */
1406 #endif /* IPSEC */
1407
1408 default:
1409 error = ENOPROTOOPT;
1410 break;
1411 }
1412 break;
1413
1414 case SOPT_GET:
1415 switch (sopt->sopt_name) {
1416 case IP_OPTIONS:
1417 case IP_RETOPTS:
1418 INP_RLOCK(inp);
1419 if (inp->inp_options) {
1420 struct mbuf *options;
1421
1422 options = m_copym(inp->inp_options, 0,
1423 M_COPYALL, M_NOWAIT);
1424 INP_RUNLOCK(inp);
1425 if (options != NULL) {
1426 error = sooptcopyout(sopt,
1427 mtod(options, char *),
1428 options->m_len);
1429 m_freem(options);
1430 } else
1431 error = ENOMEM;
1432 } else {
1433 INP_RUNLOCK(inp);
1434 sopt->sopt_valsize = 0;
1435 }
1436 break;
1437
1438 case IP_TOS:
1439 case IP_TTL:
1440 case IP_MINTTL:
1441 case IP_RECVOPTS:
1442 case IP_RECVRETOPTS:
1443 case IP_ORIGDSTADDR:
1444 case IP_RECVDSTADDR:
1445 case IP_RECVTTL:
1446 case IP_RECVIF:
1447 case IP_PORTRANGE:
1448 case IP_ONESBCAST:
1449 case IP_DONTFRAG:
1450 case IP_BINDANY:
1451 case IP_RECVTOS:
1452 case IP_BINDMULTI:
1453 case IP_FLOWID:
1454 case IP_FLOWTYPE:
1455 case IP_RECVFLOWID:
1456 #ifdef RSS
1457 case IP_RSSBUCKETID:
1458 case IP_RECVRSSBUCKETID:
1459 #endif
1460 case IP_VLAN_PCP:
1461 switch (sopt->sopt_name) {
1462 case IP_TOS:
1463 optval = inp->inp_ip_tos;
1464 break;
1465
1466 case IP_TTL:
1467 optval = inp->inp_ip_ttl;
1468 break;
1469
1470 case IP_MINTTL:
1471 optval = inp->inp_ip_minttl;
1472 break;
1473
1474 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
1475 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0)
1476
1477 case IP_RECVOPTS:
1478 optval = OPTBIT(INP_RECVOPTS);
1479 break;
1480
1481 case IP_RECVRETOPTS:
1482 optval = OPTBIT(INP_RECVRETOPTS);
1483 break;
1484
1485 case IP_RECVDSTADDR:
1486 optval = OPTBIT(INP_RECVDSTADDR);
1487 break;
1488
1489 case IP_ORIGDSTADDR:
1490 optval = OPTBIT2(INP_ORIGDSTADDR);
1491 break;
1492
1493 case IP_RECVTTL:
1494 optval = OPTBIT(INP_RECVTTL);
1495 break;
1496
1497 case IP_RECVIF:
1498 optval = OPTBIT(INP_RECVIF);
1499 break;
1500
1501 case IP_PORTRANGE:
1502 if (inp->inp_flags & INP_HIGHPORT)
1503 optval = IP_PORTRANGE_HIGH;
1504 else if (inp->inp_flags & INP_LOWPORT)
1505 optval = IP_PORTRANGE_LOW;
1506 else
1507 optval = 0;
1508 break;
1509
1510 case IP_ONESBCAST:
1511 optval = OPTBIT(INP_ONESBCAST);
1512 break;
1513 case IP_DONTFRAG:
1514 optval = OPTBIT(INP_DONTFRAG);
1515 break;
1516 case IP_BINDANY:
1517 optval = OPTBIT(INP_BINDANY);
1518 break;
1519 case IP_RECVTOS:
1520 optval = OPTBIT(INP_RECVTOS);
1521 break;
1522 case IP_FLOWID:
1523 optval = inp->inp_flowid;
1524 break;
1525 case IP_FLOWTYPE:
1526 optval = inp->inp_flowtype;
1527 break;
1528 case IP_RECVFLOWID:
1529 optval = OPTBIT2(INP_RECVFLOWID);
1530 break;
1531 #ifdef RSS
1532 case IP_RSSBUCKETID:
1533 retval = rss_hash2bucket(inp->inp_flowid,
1534 inp->inp_flowtype,
1535 &rss_bucket);
1536 if (retval == 0)
1537 optval = rss_bucket;
1538 else
1539 error = EINVAL;
1540 break;
1541 case IP_RECVRSSBUCKETID:
1542 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1543 break;
1544 #endif
1545 case IP_BINDMULTI:
1546 optval = OPTBIT2(INP_BINDMULTI);
1547 break;
1548 case IP_VLAN_PCP:
1549 if (OPTBIT2(INP_2PCP_SET)) {
1550 optval = (inp->inp_flags2 &
1551 INP_2PCP_MASK) >> INP_2PCP_SHIFT;
1552 } else {
1553 optval = -1;
1554 }
1555 break;
1556 }
1557 error = sooptcopyout(sopt, &optval, sizeof optval);
1558 break;
1559
1560 /*
1561 * Multicast socket options are processed by the in_mcast
1562 * module.
1563 */
1564 case IP_MULTICAST_IF:
1565 case IP_MULTICAST_VIF:
1566 case IP_MULTICAST_TTL:
1567 case IP_MULTICAST_LOOP:
1568 case IP_MSFILTER:
1569 error = inp_getmoptions(inp, sopt);
1570 break;
1571
1572 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1573 case IP_IPSEC_POLICY:
1574 if (IPSEC_ENABLED(ipv4)) {
1575 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1576 break;
1577 }
1578 /* FALLTHROUGH */
1579 #endif /* IPSEC */
1580
1581 default:
1582 error = ENOPROTOOPT;
1583 break;
1584 }
1585 break;
1586 }
1587 return (error);
1588 }
1589
1590 /*
1591 * Routine called from ip_output() to loop back a copy of an IP multicast
1592 * packet to the input queue of a specified interface. Note that this
1593 * calls the output routine of the loopback "driver", but with an interface
1594 * pointer that might NOT be a loopback interface -- evil, but easier than
1595 * replicating that code here.
1596 */
1597 static void
ip_mloopback(struct ifnet * ifp,const struct mbuf * m,int hlen)1598 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1599 {
1600 struct ip *ip;
1601 struct mbuf *copym;
1602
1603 /*
1604 * Make a deep copy of the packet because we're going to
1605 * modify the pack in order to generate checksums.
1606 */
1607 copym = m_dup(m, M_NOWAIT);
1608 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1609 copym = m_pullup(copym, hlen);
1610 if (copym != NULL) {
1611 /* If needed, compute the checksum and mark it as valid. */
1612 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1613 in_delayed_cksum(copym);
1614 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1615 copym->m_pkthdr.csum_flags |=
1616 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1617 copym->m_pkthdr.csum_data = 0xffff;
1618 }
1619 /*
1620 * We don't bother to fragment if the IP length is greater
1621 * than the interface's MTU. Can this possibly matter?
1622 */
1623 ip = mtod(copym, struct ip *);
1624 ip->ip_sum = 0;
1625 ip->ip_sum = in_cksum(copym, hlen);
1626 if_simloop(ifp, copym, AF_INET, 0);
1627 }
1628 }
1629