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
32 #include "opt_inet.h"
33 #include "opt_ipsec.h"
34 #include "opt_kern_tls.h"
35 #include "opt_mbuf_stress_test.h"
36 #include "opt_ratelimit.h"
37 #include "opt_route.h"
38 #include "opt_rss.h"
39 #include "opt_sctp.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/ktls.h>
45 #include <sys/lock.h>
46 #include <sys/malloc.h>
47 #include <sys/mbuf.h>
48 #include <sys/priv.h>
49 #include <sys/proc.h>
50 #include <sys/protosw.h>
51 #include <sys/sdt.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
54 #include <sys/sysctl.h>
55 #include <sys/ucred.h>
56
57 #include <net/if.h>
58 #include <net/if_var.h>
59 #include <net/if_private.h>
60 #include <net/if_vlan_var.h>
61 #include <net/if_llatbl.h>
62 #include <net/ethernet.h>
63 #include <net/netisr.h>
64 #include <net/pfil.h>
65 #include <net/route.h>
66 #include <net/route/nhop.h>
67 #include <net/rss_config.h>
68 #include <net/vnet.h>
69
70 #include <netinet/in.h>
71 #include <netinet/in_fib.h>
72 #include <netinet/in_kdtrace.h>
73 #include <netinet/in_systm.h>
74 #include <netinet/ip.h>
75 #include <netinet/in_fib.h>
76 #include <netinet/in_pcb.h>
77 #include <netinet/in_rss.h>
78 #include <netinet/in_var.h>
79 #include <netinet/ip_var.h>
80 #include <netinet/ip_options.h>
81 #include <netinet/ip_mroute.h>
82
83 #include <netinet/udp.h>
84 #include <netinet/udp_var.h>
85
86 #if defined(SCTP) || defined(SCTP_SUPPORT)
87 #include <netinet/sctp.h>
88 #include <netinet/sctp_crc32.h>
89 #endif
90
91 #include <netipsec/ipsec_support.h>
92
93 #include <machine/in_cksum.h>
94
95 #include <security/mac/mac_framework.h>
96
97 #ifdef MBUF_STRESS_TEST
98 static int mbuf_frag_size = 0;
99 SYSCTL_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
103 static void ip_mloopback(struct ifnet *, const struct mbuf *, int);
104
105 extern int in_mcast_loop;
106
107 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)108 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags,
109 struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error)
110 {
111 struct m_tag *fwd_tag = NULL;
112 struct mbuf *m;
113 struct in_addr odst;
114 struct ip *ip;
115 int ret;
116
117 m = *mp;
118 ip = mtod(m, struct ip *);
119
120 /* Run through list of hooks for output packets. */
121 odst.s_addr = ip->ip_dst.s_addr;
122 if (flags & IP_FORWARDING)
123 ret = pfil_mbuf_fwd(V_inet_pfil_head, mp, ifp, inp);
124 else
125 ret = pfil_mbuf_out(V_inet_pfil_head, mp, ifp, inp);
126
127 switch (ret) {
128 case PFIL_DROPPED:
129 *error = EACCES;
130 /* FALLTHROUGH */
131 case PFIL_CONSUMED:
132 return 1; /* Finished */
133 case PFIL_PASS:
134 *error = 0;
135 }
136 m = *mp;
137 ip = mtod(m, struct ip *);
138
139 /* See if destination IP address was changed by packet filter. */
140 if (odst.s_addr != ip->ip_dst.s_addr) {
141 m->m_flags |= M_SKIP_FIREWALL;
142 /* If destination is now ourself drop to ip_input(). */
143 if (in_localip(ip->ip_dst)) {
144 m->m_flags |= M_FASTFWD_OURS;
145 if (m->m_pkthdr.rcvif == NULL)
146 m->m_pkthdr.rcvif = V_loif;
147 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
148 m->m_pkthdr.csum_flags |=
149 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
150 m->m_pkthdr.csum_data = 0xffff;
151 }
152 m->m_pkthdr.csum_flags |=
153 CSUM_IP_CHECKED | CSUM_IP_VALID;
154 #if defined(SCTP) || defined(SCTP_SUPPORT)
155 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
156 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
157 #endif
158 *error = netisr_queue(NETISR_IP, m);
159 return 1; /* Finished */
160 }
161
162 bzero(dst, sizeof(*dst));
163 dst->sin_family = AF_INET;
164 dst->sin_len = sizeof(*dst);
165 dst->sin_addr = ip->ip_dst;
166
167 return -1; /* Reloop */
168 }
169 /* See if fib was changed by packet filter. */
170 if ((*fibnum) != M_GETFIB(m)) {
171 m->m_flags |= M_SKIP_FIREWALL;
172 *fibnum = M_GETFIB(m);
173 return -1; /* Reloop for FIB change */
174 }
175
176 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
177 if (m->m_flags & M_FASTFWD_OURS) {
178 if (m->m_pkthdr.rcvif == NULL)
179 m->m_pkthdr.rcvif = V_loif;
180 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
181 m->m_pkthdr.csum_flags |=
182 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
183 m->m_pkthdr.csum_data = 0xffff;
184 }
185 #if defined(SCTP) || defined(SCTP_SUPPORT)
186 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
187 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
188 #endif
189 m->m_pkthdr.csum_flags |=
190 CSUM_IP_CHECKED | CSUM_IP_VALID;
191
192 *error = netisr_queue(NETISR_IP, m);
193 return 1; /* Finished */
194 }
195 /* Or forward to some other address? */
196 if ((m->m_flags & M_IP_NEXTHOP) &&
197 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
198 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
199 m->m_flags |= M_SKIP_FIREWALL;
200 m->m_flags &= ~M_IP_NEXTHOP;
201 m_tag_delete(m, fwd_tag);
202
203 return -1; /* Reloop for CHANGE of dst */
204 }
205
206 return 0;
207 }
208
209 static int
ip_output_send(struct inpcb * inp,struct ifnet * ifp,struct mbuf * m,const struct sockaddr * gw,struct route * ro,bool stamp_tag)210 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m,
211 const struct sockaddr *gw, struct route *ro, bool stamp_tag)
212 {
213 #ifdef KERN_TLS
214 struct ktls_session *tls = NULL;
215 #endif
216 struct m_snd_tag *mst;
217 int error;
218
219 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
220 mst = NULL;
221
222 #ifdef KERN_TLS
223 /*
224 * If this is an unencrypted TLS record, save a reference to
225 * the record. This local reference is used to call
226 * ktls_output_eagain after the mbuf has been freed (thus
227 * dropping the mbuf's reference) in if_output.
228 */
229 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
230 tls = ktls_hold(m->m_next->m_epg_tls);
231 mst = tls->snd_tag;
232
233 /*
234 * If a TLS session doesn't have a valid tag, it must
235 * have had an earlier ifp mismatch, so drop this
236 * packet.
237 */
238 if (mst == NULL) {
239 m_freem(m);
240 error = EAGAIN;
241 goto done;
242 }
243 /*
244 * Always stamp tags that include NIC ktls.
245 */
246 stamp_tag = true;
247 }
248 #endif
249 #ifdef RATELIMIT
250 if (inp != NULL && mst == NULL) {
251 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
252 (inp->inp_snd_tag != NULL &&
253 inp->inp_snd_tag->ifp != ifp))
254 in_pcboutput_txrtlmt(inp, ifp, m);
255
256 if (inp->inp_snd_tag != NULL)
257 mst = inp->inp_snd_tag;
258 }
259 #endif
260 if (stamp_tag && mst != NULL) {
261 KASSERT(m->m_pkthdr.rcvif == NULL,
262 ("trying to add a send tag to a forwarded packet"));
263 if (mst->ifp != ifp) {
264 m_freem(m);
265 error = EAGAIN;
266 goto done;
267 }
268
269 /* stamp send tag on mbuf */
270 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
271 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
272 }
273
274 error = (*ifp->if_output)(ifp, m, gw, ro);
275
276 done:
277 /* Check for route change invalidating send tags. */
278 #ifdef KERN_TLS
279 if (tls != NULL) {
280 if (error == EAGAIN)
281 error = ktls_output_eagain(inp, tls);
282 ktls_free(tls);
283 }
284 #endif
285 #ifdef RATELIMIT
286 if (error == EAGAIN)
287 in_pcboutput_eagain(inp);
288 #endif
289 return (error);
290 }
291
292 /* rte<>ro_flags translation */
293 static inline void
rt_update_ro_flags(struct route * ro,const struct nhop_object * nh)294 rt_update_ro_flags(struct route *ro, const struct nhop_object *nh)
295 {
296 int nh_flags = nh->nh_flags;
297
298 ro->ro_flags &= ~ (RT_REJECT|RT_BLACKHOLE|RT_HAS_GW);
299
300 ro->ro_flags |= (nh_flags & NHF_REJECT) ? RT_REJECT : 0;
301 ro->ro_flags |= (nh_flags & NHF_BLACKHOLE) ? RT_BLACKHOLE : 0;
302 ro->ro_flags |= (nh_flags & NHF_GATEWAY) ? RT_HAS_GW : 0;
303 }
304
305 /*
306 * IP output. The packet in mbuf chain m contains a skeletal IP
307 * header (with len, off, ttl, proto, tos, src, dst).
308 * The mbuf chain containing the packet will be freed.
309 * The mbuf opt, if present, will not be freed.
310 * If route ro is present and has ro_rt initialized, route lookup would be
311 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
312 * then result of route lookup is stored in ro->ro_rt.
313 *
314 * In the IP forwarding case, the packet will arrive with options already
315 * inserted, so must have a NULL opt pointer.
316 */
317 int
ip_output(struct mbuf * m,struct mbuf * opt,struct route * ro,int flags,struct ip_moptions * imo,struct inpcb * inp)318 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
319 struct ip_moptions *imo, struct inpcb *inp)
320 {
321 struct ip *ip;
322 struct ifnet *ifp = NULL; /* keep compiler happy */
323 struct mbuf *m0;
324 int hlen = sizeof (struct ip);
325 int mtu = 0;
326 int error = 0;
327 int vlan_pcp = -1;
328 struct sockaddr_in *dst;
329 const struct sockaddr *gw;
330 struct in_ifaddr *ia = NULL;
331 struct in_addr src;
332 bool isbroadcast;
333 uint16_t ip_len, ip_off;
334 struct route iproute;
335 uint32_t fibnum;
336 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
337 int no_route_but_check_spd = 0;
338 #endif
339
340 M_ASSERTPKTHDR(m);
341 NET_EPOCH_ASSERT();
342
343 if (inp != NULL) {
344 INP_LOCK_ASSERT(inp);
345 M_SETFIB(m, inp->inp_inc.inc_fibnum);
346 if ((flags & IP_NODEFAULTFLOWID) == 0) {
347 m->m_pkthdr.flowid = inp->inp_flowid;
348 M_HASHTYPE_SET(m, inp->inp_flowtype);
349 }
350 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
351 vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
352 INP_2PCP_SHIFT;
353 #ifdef NUMA
354 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
355 #endif
356 }
357
358 if (opt) {
359 int len = 0;
360 m = ip_insertoptions(m, opt, &len);
361 if (len != 0)
362 hlen = len; /* ip->ip_hl is updated above */
363 }
364 ip = mtod(m, struct ip *);
365 ip_len = ntohs(ip->ip_len);
366 ip_off = ntohs(ip->ip_off);
367
368 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
369 ip->ip_v = IPVERSION;
370 ip->ip_hl = hlen >> 2;
371 ip_fillid(ip, V_ip_random_id);
372 } else {
373 /* Header already set, fetch hlen from there */
374 hlen = ip->ip_hl << 2;
375 }
376 if ((flags & IP_FORWARDING) == 0)
377 IPSTAT_INC(ips_localout);
378
379 /*
380 * dst/gw handling:
381 *
382 * gw is readonly but can point either to dst OR rt_gateway,
383 * therefore we need restore gw if we're redoing lookup.
384 */
385 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
386 if (ro == NULL) {
387 ro = &iproute;
388 bzero(ro, sizeof (*ro));
389 }
390 dst = (struct sockaddr_in *)&ro->ro_dst;
391 if (ro->ro_nh == NULL) {
392 dst->sin_family = AF_INET;
393 dst->sin_len = sizeof(*dst);
394 dst->sin_addr = ip->ip_dst;
395 }
396 gw = (const struct sockaddr *)dst;
397 again:
398 /*
399 * Validate route against routing table additions;
400 * a better/more specific route might have been added.
401 */
402 if (inp != NULL && ro->ro_nh != NULL)
403 NH_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
404 /*
405 * If there is a cached route,
406 * check that it is to the same destination
407 * and is still up. If not, free it and try again.
408 * The address family should also be checked in case of sharing the
409 * cache with IPv6.
410 * Also check whether routing cache needs invalidation.
411 */
412 if (ro->ro_nh != NULL &&
413 ((!NH_IS_VALID(ro->ro_nh)) || dst->sin_family != AF_INET ||
414 dst->sin_addr.s_addr != ip->ip_dst.s_addr))
415 RO_INVALIDATE_CACHE(ro);
416 ia = NULL;
417 /*
418 * If routing to interface only, short circuit routing lookup.
419 * The use of an all-ones broadcast address implies this; an
420 * interface is specified by the broadcast address of an interface,
421 * or the destination address of a ptp interface.
422 */
423 if (flags & IP_SENDONES) {
424 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
425 M_GETFIB(m)))) == NULL &&
426 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
427 M_GETFIB(m)))) == NULL) {
428 IPSTAT_INC(ips_noroute);
429 error = ENETUNREACH;
430 goto bad;
431 }
432 ip->ip_dst.s_addr = INADDR_BROADCAST;
433 dst->sin_addr = ip->ip_dst;
434 ifp = ia->ia_ifp;
435 mtu = ifp->if_mtu;
436 ip->ip_ttl = 1;
437 isbroadcast = true;
438 src = IA_SIN(ia)->sin_addr;
439 } else if (flags & IP_ROUTETOIF) {
440 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
441 M_GETFIB(m)))) == NULL &&
442 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
443 M_GETFIB(m)))) == NULL) {
444 IPSTAT_INC(ips_noroute);
445 error = ENETUNREACH;
446 goto bad;
447 }
448 ifp = ia->ia_ifp;
449 mtu = ifp->if_mtu;
450 ip->ip_ttl = 1;
451 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
452 (in_broadcast(ip->ip_dst) ||
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);
464 isbroadcast = false;
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 != &iproute) {
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 struct nhop_object *nh = ro->ro_nh;
497
498 ia = ifatoia(nh->nh_ifa);
499 ifp = nh->nh_ifp;
500 counter_u64_add(nh->nh_pksent, 1);
501 rt_update_ro_flags(ro, nh);
502 if (nh->nh_flags & NHF_GATEWAY)
503 gw = &nh->gw_sa;
504 if (nh->nh_flags & NHF_HOST)
505 isbroadcast = (nh->nh_flags & NHF_BROADCAST);
506 else if ((ifp->if_flags & IFF_BROADCAST) &&
507 (gw->sa_family == AF_INET))
508 isbroadcast = in_broadcast(ip->ip_dst) ||
509 in_ifaddr_broadcast(
510 ((const struct sockaddr_in *)gw)->sin_addr, ia);
511 else
512 isbroadcast = false;
513 mtu = nh->nh_mtu;
514 src = IA_SIN(ia)->sin_addr;
515 } else {
516 struct nhop_object *nh;
517
518 nh = fib4_lookup(M_GETFIB(m), dst->sin_addr, 0, NHR_NONE,
519 m->m_pkthdr.flowid);
520 if (nh == NULL) {
521 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
522 /*
523 * There is no route for this packet, but it is
524 * possible that a matching SPD entry exists.
525 */
526 no_route_but_check_spd = 1;
527 goto sendit;
528 #endif
529 IPSTAT_INC(ips_noroute);
530 error = EHOSTUNREACH;
531 goto bad;
532 }
533 ifp = nh->nh_ifp;
534 mtu = nh->nh_mtu;
535 rt_update_ro_flags(ro, nh);
536 if (nh->nh_flags & NHF_GATEWAY)
537 gw = &nh->gw_sa;
538 ia = ifatoia(nh->nh_ifa);
539 src = IA_SIN(ia)->sin_addr;
540 isbroadcast = ((nh->nh_flags & (NHF_HOST | NHF_BROADCAST)) ==
541 (NHF_HOST | NHF_BROADCAST)) ||
542 ((ifp->if_flags & IFF_BROADCAST) &&
543 (gw->sa_family == AF_INET) &&
544 (in_broadcast(ip->ip_dst) || in_ifaddr_broadcast(
545 ((const struct sockaddr_in *)gw)->sin_addr, ia)));
546 }
547
548 /* Catch a possible divide by zero later. */
549 KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (nh_flags=0x%08x) ifp=%p",
550 __func__, mtu, ro,
551 (ro != NULL && ro->ro_nh != NULL) ? ro->ro_nh->nh_flags : 0, ifp));
552
553 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
554 m->m_flags |= M_MCAST;
555 /*
556 * IP destination address is multicast. Make sure "gw"
557 * still points to the address in "ro". (It may have been
558 * changed to point to a gateway address, above.)
559 */
560 gw = (const struct sockaddr *)dst;
561 /*
562 * See if the caller provided any multicast options
563 */
564 if (imo != NULL) {
565 ip->ip_ttl = imo->imo_multicast_ttl;
566 if (imo->imo_multicast_vif != -1)
567 ip->ip_src.s_addr =
568 ip_mcast_src ?
569 ip_mcast_src(imo->imo_multicast_vif) :
570 INADDR_ANY;
571 } else
572 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
573 /*
574 * Confirm that the outgoing interface supports multicast.
575 */
576 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
577 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
578 IPSTAT_INC(ips_noroute);
579 error = ENETUNREACH;
580 goto bad;
581 }
582 }
583 /*
584 * If source address not specified yet, use address
585 * of outgoing interface.
586 */
587 if (ip->ip_src.s_addr == INADDR_ANY)
588 ip->ip_src = src;
589
590 if ((imo == NULL && in_mcast_loop) ||
591 (imo && imo->imo_multicast_loop)) {
592 /*
593 * Loop back multicast datagram if not expressly
594 * forbidden to do so, even if we are not a member
595 * of the group; ip_input() will filter it later,
596 * thus deferring a hash lookup and mutex acquisition
597 * at the expense of a cheap copy using m_copym().
598 */
599 ip_mloopback(ifp, m, hlen);
600 } else {
601 /*
602 * If we are acting as a multicast router, perform
603 * multicast forwarding as if the packet had just
604 * arrived on the interface to which we are about
605 * to send. The multicast forwarding function
606 * recursively calls this function, using the
607 * IP_FORWARDING flag to prevent infinite recursion.
608 *
609 * Multicasts that are looped back by ip_mloopback(),
610 * above, will be forwarded by the ip_input() routine,
611 * if necessary.
612 */
613 if (V_ip_mrouting_enabled &&
614 (flags & IP_FORWARDING) == 0) {
615 /*
616 * If rsvp daemon is not running, do not
617 * set ip_moptions. This ensures that the packet
618 * is multicast and not just sent down one link
619 * as prescribed by rsvpd.
620 */
621 if (!V_rsvp_on)
622 imo = NULL;
623 if (ip_mforward &&
624 ip_mforward(ip, ifp, m, imo) != 0) {
625 m_freem(m);
626 goto done;
627 }
628 }
629 }
630
631 /*
632 * Multicasts with a time-to-live of zero may be looped-
633 * back, above, but must not be transmitted on a network.
634 * Also, multicasts addressed to the loopback interface
635 * are not sent -- the above call to ip_mloopback() will
636 * loop back a copy. ip_input() will drop the copy if
637 * this host does not belong to the destination group on
638 * the loopback interface.
639 */
640 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
641 m_freem(m);
642 goto done;
643 }
644
645 goto sendit;
646 }
647
648 /*
649 * If the source address is not specified yet, use the address
650 * of the outoing interface.
651 */
652 if (ip->ip_src.s_addr == INADDR_ANY)
653 ip->ip_src = src;
654
655 /*
656 * Look for broadcast address and
657 * verify user is allowed to send
658 * such a packet.
659 */
660 if (isbroadcast) {
661 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
662 error = EADDRNOTAVAIL;
663 goto bad;
664 }
665 if ((flags & IP_ALLOWBROADCAST) == 0) {
666 error = EACCES;
667 goto bad;
668 }
669 /* don't allow broadcast messages to be fragmented */
670 if (ip_len > mtu) {
671 error = EMSGSIZE;
672 goto bad;
673 }
674 m->m_flags |= M_BCAST;
675 } else {
676 m->m_flags &= ~M_BCAST;
677 }
678
679 sendit:
680 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
681 if (IPSEC_ENABLED(ipv4)) {
682 struct ip ip_hdr;
683
684 if ((error = IPSEC_OUTPUT(ipv4, ifp, m, inp, mtu)) != 0) {
685 if (error == EINPROGRESS)
686 error = 0;
687 goto done;
688 }
689
690 /* Update variables that are affected by ipsec4_output(). */
691 m_copydata(m, 0, sizeof(ip_hdr), (char *)&ip_hdr);
692 hlen = ip_hdr.ip_hl << 2;
693 }
694
695 /*
696 * Check if there was a route for this packet; return error if not.
697 */
698 if (no_route_but_check_spd) {
699 IPSTAT_INC(ips_noroute);
700 error = EHOSTUNREACH;
701 goto bad;
702 }
703 #endif /* IPSEC */
704
705 /* Jump over all PFIL processing if hooks are not active. */
706 if (PFIL_HOOKED_OUT(V_inet_pfil_head)) {
707 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum,
708 &error)) {
709 case 1: /* Finished */
710 goto done;
711
712 case 0: /* Continue normally */
713 ip = mtod(m, struct ip *);
714 ip_len = ntohs(ip->ip_len);
715 break;
716
717 case -1: /* Need to try again */
718 /* Reset everything for a new round */
719 if (ro != NULL) {
720 RO_NHFREE(ro);
721 ro->ro_prepend = NULL;
722 }
723 gw = (const struct sockaddr *)dst;
724 ip = mtod(m, struct ip *);
725 goto again;
726 }
727 }
728
729 if (vlan_pcp > -1)
730 EVL_APPLY_PRI(m, vlan_pcp);
731
732 /* IN_LOOPBACK must not appear on the wire - RFC1122. */
733 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
734 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
735 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
736 IPSTAT_INC(ips_badaddr);
737 error = EADDRNOTAVAIL;
738 goto bad;
739 }
740 }
741
742 /* Ensure the packet data is mapped if the interface requires it. */
743 if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) {
744 struct mbuf *m1;
745
746 error = mb_unmapped_to_ext(m, &m1);
747 if (error != 0) {
748 if (error == EINVAL) {
749 if_printf(ifp, "TLS packet\n");
750 /* XXXKIB */
751 } else if (error == ENOMEM) {
752 error = ENOBUFS;
753 }
754 IPSTAT_INC(ips_odropped);
755 goto done;
756 } else {
757 m = m1;
758 }
759 }
760
761 m->m_pkthdr.csum_flags |= CSUM_IP;
762 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
763 in_delayed_cksum(m);
764 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
765 }
766 #if defined(SCTP) || defined(SCTP_SUPPORT)
767 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
768 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
769 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
770 }
771 #endif
772
773 /*
774 * If small enough for interface, or the interface will take
775 * care of the fragmentation for us, we can just send directly.
776 * Note that if_vxlan could have requested TSO even though the outer
777 * frame is UDP. It is correct to not fragment such datagrams and
778 * instead just pass them on to the driver.
779 */
780 if (ip_len <= mtu ||
781 (m->m_pkthdr.csum_flags & ifp->if_hwassist &
782 (CSUM_TSO | CSUM_INNER_TSO)) != 0) {
783 ip->ip_sum = 0;
784 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
785 ip->ip_sum = in_cksum(m, hlen);
786 m->m_pkthdr.csum_flags &= ~CSUM_IP;
787 }
788
789 /*
790 * Record statistics for this interface address.
791 * With CSUM_TSO the byte/packet count will be slightly
792 * incorrect because we count the IP+TCP headers only
793 * once instead of for every generated packet.
794 */
795 if (!(flags & IP_FORWARDING) && ia) {
796 if (m->m_pkthdr.csum_flags &
797 (CSUM_TSO | CSUM_INNER_TSO))
798 counter_u64_add(ia->ia_ifa.ifa_opackets,
799 m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
800 else
801 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
802
803 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
804 }
805 #ifdef MBUF_STRESS_TEST
806 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
807 m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
808 #endif
809 /*
810 * Reset layer specific mbuf flags
811 * to avoid confusing lower layers.
812 */
813 m_clrprotoflags(m);
814 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
815 error = ip_output_send(inp, ifp, m, gw, ro,
816 (flags & IP_NO_SND_TAG_RL) ? false : true);
817 goto done;
818 }
819
820 /* Balk when DF bit is set or the interface didn't support TSO. */
821 if ((ip_off & IP_DF) ||
822 (m->m_pkthdr.csum_flags & (CSUM_TSO | CSUM_INNER_TSO))) {
823 error = EMSGSIZE;
824 IPSTAT_INC(ips_cantfrag);
825 goto bad;
826 }
827
828 /*
829 * Too large for interface; fragment if possible. If successful,
830 * on return, m will point to a list of packets to be sent.
831 */
832 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
833 if (error)
834 goto bad;
835 for (; m; m = m0) {
836 m0 = m->m_nextpkt;
837 m->m_nextpkt = 0;
838 if (error == 0) {
839 /* Record statistics for this interface address. */
840 if (ia != NULL) {
841 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
842 counter_u64_add(ia->ia_ifa.ifa_obytes,
843 m->m_pkthdr.len);
844 }
845 /*
846 * Reset layer specific mbuf flags
847 * to avoid confusing upper layers.
848 */
849 m_clrprotoflags(m);
850
851 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
852 mtod(m, struct ip *), NULL);
853 error = ip_output_send(inp, ifp, m, gw, ro, true);
854 } else
855 m_freem(m);
856 }
857
858 if (error == 0)
859 IPSTAT_INC(ips_fragmented);
860
861 done:
862 return (error);
863 bad:
864 m_freem(m);
865 goto done;
866 }
867
868 /*
869 * Create a chain of fragments which fit the given mtu. m_frag points to the
870 * mbuf to be fragmented; on return it points to the chain with the fragments.
871 * Return 0 if no error. If error, m_frag may contain a partially built
872 * chain of fragments that should be freed by the caller.
873 *
874 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
875 */
876 int
ip_fragment(struct ip * ip,struct mbuf ** m_frag,int mtu,u_long if_hwassist_flags)877 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
878 u_long if_hwassist_flags)
879 {
880 int error = 0;
881 int hlen = ip->ip_hl << 2;
882 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
883 int off;
884 struct mbuf *m0 = *m_frag; /* the original packet */
885 int firstlen;
886 struct mbuf **mnext;
887 int nfrags;
888 uint16_t ip_len, ip_off;
889
890 ip_len = ntohs(ip->ip_len);
891 ip_off = ntohs(ip->ip_off);
892
893 /*
894 * Packet shall not have "Don't Fragment" flag and have at least 8
895 * bytes of payload.
896 */
897 if (__predict_false((ip_off & IP_DF) || len < 8)) {
898 IPSTAT_INC(ips_cantfrag);
899 return (EMSGSIZE);
900 }
901
902 /*
903 * If the interface will not calculate checksums on
904 * fragmented packets, then do it here.
905 */
906 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
907 in_delayed_cksum(m0);
908 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
909 }
910 #if defined(SCTP) || defined(SCTP_SUPPORT)
911 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
912 sctp_delayed_cksum(m0, hlen);
913 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
914 }
915 #endif
916 if (len > PAGE_SIZE) {
917 /*
918 * Fragment large datagrams such that each segment
919 * contains a multiple of PAGE_SIZE amount of data,
920 * plus headers. This enables a receiver to perform
921 * page-flipping zero-copy optimizations.
922 *
923 * XXX When does this help given that sender and receiver
924 * could have different page sizes, and also mtu could
925 * be less than the receiver's page size ?
926 */
927 int newlen;
928
929 off = MIN(mtu, m0->m_pkthdr.len);
930
931 /*
932 * firstlen (off - hlen) must be aligned on an
933 * 8-byte boundary
934 */
935 if (off < hlen)
936 goto smart_frag_failure;
937 off = ((off - hlen) & ~7) + hlen;
938 newlen = (~PAGE_MASK) & mtu;
939 if ((newlen + sizeof (struct ip)) > mtu) {
940 /* we failed, go back the default */
941 smart_frag_failure:
942 newlen = len;
943 off = hlen + len;
944 }
945 len = newlen;
946
947 } else {
948 off = hlen + len;
949 }
950
951 firstlen = off - hlen;
952 mnext = &m0->m_nextpkt; /* pointer to next packet */
953
954 /*
955 * Loop through length of segment after first fragment,
956 * make new header and copy data of each part and link onto chain.
957 * Here, m0 is the original packet, m is the fragment being created.
958 * The fragments are linked off the m_nextpkt of the original
959 * packet, which after processing serves as the first fragment.
960 */
961 for (nfrags = 1; off < ip_len; off += len, nfrags++) {
962 struct ip *mhip; /* ip header on the fragment */
963 struct mbuf *m;
964 int mhlen = sizeof (struct ip);
965
966 m = m_gethdr(M_NOWAIT, MT_DATA);
967 if (m == NULL) {
968 error = ENOBUFS;
969 IPSTAT_INC(ips_odropped);
970 goto done;
971 }
972 /*
973 * Make sure the complete packet header gets copied
974 * from the originating mbuf to the newly created
975 * mbuf. This also ensures that existing firewall
976 * classification(s), VLAN tags and so on get copied
977 * to the resulting fragmented packet(s):
978 */
979 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
980 m_free(m);
981 error = ENOBUFS;
982 IPSTAT_INC(ips_odropped);
983 goto done;
984 }
985 /*
986 * In the first mbuf, leave room for the link header, then
987 * copy the original IP header including options. The payload
988 * goes into an additional mbuf chain returned by m_copym().
989 */
990 m->m_data += max_linkhdr;
991 mhip = mtod(m, struct ip *);
992 *mhip = *ip;
993 if (hlen > sizeof (struct ip)) {
994 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
995 mhip->ip_v = IPVERSION;
996 mhip->ip_hl = mhlen >> 2;
997 }
998 m->m_len = mhlen;
999 /* XXX do we need to add ip_off below ? */
1000 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
1001 if (off + len >= ip_len)
1002 len = ip_len - off;
1003 else
1004 mhip->ip_off |= IP_MF;
1005 mhip->ip_len = htons((u_short)(len + mhlen));
1006 m->m_next = m_copym(m0, off, len, M_NOWAIT);
1007 if (m->m_next == NULL) { /* copy failed */
1008 m_free(m);
1009 error = ENOBUFS; /* ??? */
1010 IPSTAT_INC(ips_odropped);
1011 goto done;
1012 }
1013 m->m_pkthdr.len = mhlen + len;
1014 #ifdef MAC
1015 mac_netinet_fragment(m0, m);
1016 #endif
1017 mhip->ip_off = htons(mhip->ip_off);
1018 mhip->ip_sum = 0;
1019 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1020 mhip->ip_sum = in_cksum(m, mhlen);
1021 m->m_pkthdr.csum_flags &= ~CSUM_IP;
1022 }
1023 *mnext = m;
1024 mnext = &m->m_nextpkt;
1025 }
1026 IPSTAT_ADD(ips_ofragments, nfrags);
1027
1028 /*
1029 * Update first fragment by trimming what's been copied out
1030 * and updating header.
1031 */
1032 m_adj(m0, hlen + firstlen - ip_len);
1033 m0->m_pkthdr.len = hlen + firstlen;
1034 ip->ip_len = htons((u_short)m0->m_pkthdr.len);
1035 ip->ip_off = htons(ip_off | IP_MF);
1036 ip->ip_sum = 0;
1037 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1038 ip->ip_sum = in_cksum(m0, hlen);
1039 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
1040 }
1041
1042 done:
1043 *m_frag = m0;
1044 return error;
1045 }
1046
1047 void
in_delayed_cksum_o(struct mbuf * m,uint16_t iph_offset)1048 in_delayed_cksum_o(struct mbuf *m, uint16_t iph_offset)
1049 {
1050 struct ip *ip;
1051 struct udphdr *uh;
1052 uint16_t cklen, csum, offset;
1053
1054 ip = (struct ip *)mtodo(m, iph_offset);
1055 offset = iph_offset + (ip->ip_hl << 2);
1056
1057 if (m->m_pkthdr.csum_flags & CSUM_UDP) {
1058 /* if udp header is not in the first mbuf copy udplen */
1059 if (offset + sizeof(struct udphdr) > m->m_len) {
1060 m_copydata(m, offset + offsetof(struct udphdr,
1061 uh_ulen), sizeof(cklen), (caddr_t)&cklen);
1062 cklen = ntohs(cklen);
1063 } else {
1064 uh = (struct udphdr *)mtodo(m, offset);
1065 cklen = ntohs(uh->uh_ulen);
1066 }
1067 csum = in_cksum_skip(m, cklen + offset, offset);
1068 if (csum == 0)
1069 csum = 0xffff;
1070 } else {
1071 cklen = ntohs(ip->ip_len) - (ip->ip_hl << 2);
1072 csum = in_cksum_skip(m, cklen + offset, offset);
1073 }
1074 offset += m->m_pkthdr.csum_data; /* checksum offset */
1075
1076 if (offset + sizeof(csum) > m->m_len)
1077 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
1078 else
1079 *(u_short *)mtodo(m, offset) = csum;
1080 }
1081
1082 void
in_delayed_cksum(struct mbuf * m)1083 in_delayed_cksum(struct mbuf *m)
1084 {
1085
1086 in_delayed_cksum_o(m, 0);
1087 }
1088
1089 /*
1090 * IP socket option processing.
1091 */
1092 int
ip_ctloutput(struct socket * so,struct sockopt * sopt)1093 ip_ctloutput(struct socket *so, struct sockopt *sopt)
1094 {
1095 struct inpcb *inp = sotoinpcb(so);
1096 int error, optval;
1097 #ifdef RSS
1098 uint32_t rss_bucket;
1099 int retval;
1100 #endif
1101
1102 error = optval = 0;
1103 if (sopt->sopt_level != IPPROTO_IP) {
1104 error = EINVAL;
1105
1106 if (sopt->sopt_level == SOL_SOCKET &&
1107 sopt->sopt_dir == SOPT_SET) {
1108 switch (sopt->sopt_name) {
1109 case SO_SETFIB:
1110 error = sooptcopyin(sopt, &optval,
1111 sizeof(optval), sizeof(optval));
1112 if (error != 0)
1113 break;
1114
1115 INP_WLOCK(inp);
1116 if ((inp->inp_flags & INP_BOUNDFIB) != 0 &&
1117 optval != so->so_fibnum) {
1118 INP_WUNLOCK(inp);
1119 error = EISCONN;
1120 break;
1121 }
1122 error = sosetfib(inp->inp_socket, optval);
1123 if (error == 0)
1124 inp->inp_inc.inc_fibnum = optval;
1125 INP_WUNLOCK(inp);
1126 break;
1127 case SO_MAX_PACING_RATE:
1128 #ifdef RATELIMIT
1129 INP_WLOCK(inp);
1130 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1131 INP_WUNLOCK(inp);
1132 error = 0;
1133 #else
1134 error = EOPNOTSUPP;
1135 #endif
1136 break;
1137 default:
1138 break;
1139 }
1140 }
1141 return (error);
1142 }
1143
1144 switch (sopt->sopt_dir) {
1145 case SOPT_SET:
1146 switch (sopt->sopt_name) {
1147 case IP_OPTIONS:
1148 #ifdef notyet
1149 case IP_RETOPTS:
1150 #endif
1151 {
1152 struct mbuf *m;
1153 if (sopt->sopt_valsize > MLEN) {
1154 error = EMSGSIZE;
1155 break;
1156 }
1157 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1158 if (m == NULL) {
1159 error = ENOBUFS;
1160 break;
1161 }
1162 m->m_len = sopt->sopt_valsize;
1163 error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1164 m->m_len);
1165 if (error) {
1166 m_free(m);
1167 break;
1168 }
1169 INP_WLOCK(inp);
1170 error = ip_pcbopts(inp, sopt->sopt_name, m);
1171 INP_WUNLOCK(inp);
1172 return (error);
1173 }
1174
1175 case IP_BINDANY:
1176 if (sopt->sopt_td != NULL) {
1177 error = priv_check(sopt->sopt_td,
1178 PRIV_NETINET_BINDANY);
1179 if (error)
1180 break;
1181 }
1182 /* FALLTHROUGH */
1183 case IP_TOS:
1184 case IP_TTL:
1185 case IP_MINTTL:
1186 case IP_RECVOPTS:
1187 case IP_RECVRETOPTS:
1188 case IP_ORIGDSTADDR:
1189 case IP_RECVDSTADDR:
1190 case IP_RECVTTL:
1191 case IP_RECVIF:
1192 case IP_ONESBCAST:
1193 case IP_DONTFRAG:
1194 case IP_RECVTOS:
1195 case IP_RECVFLOWID:
1196 #ifdef RSS
1197 case IP_RECVRSSBUCKETID:
1198 #endif
1199 case IP_VLAN_PCP:
1200 error = sooptcopyin(sopt, &optval, sizeof optval,
1201 sizeof optval);
1202 if (error)
1203 break;
1204
1205 switch (sopt->sopt_name) {
1206 case IP_TOS:
1207 inp->inp_ip_tos = optval;
1208 break;
1209
1210 case IP_TTL:
1211 inp->inp_ip_ttl = optval;
1212 break;
1213
1214 case IP_MINTTL:
1215 if (optval >= 0 && optval <= MAXTTL)
1216 inp->inp_ip_minttl = optval;
1217 else
1218 error = EINVAL;
1219 break;
1220
1221 #define OPTSET(bit) do { \
1222 INP_WLOCK(inp); \
1223 if (optval) \
1224 inp->inp_flags |= bit; \
1225 else \
1226 inp->inp_flags &= ~bit; \
1227 INP_WUNLOCK(inp); \
1228 } while (0)
1229
1230 #define OPTSET2(bit, val) do { \
1231 INP_WLOCK(inp); \
1232 if (val) \
1233 inp->inp_flags2 |= bit; \
1234 else \
1235 inp->inp_flags2 &= ~bit; \
1236 INP_WUNLOCK(inp); \
1237 } while (0)
1238
1239 case IP_RECVOPTS:
1240 OPTSET(INP_RECVOPTS);
1241 break;
1242
1243 case IP_RECVRETOPTS:
1244 OPTSET(INP_RECVRETOPTS);
1245 break;
1246
1247 case IP_RECVDSTADDR:
1248 OPTSET(INP_RECVDSTADDR);
1249 break;
1250
1251 case IP_ORIGDSTADDR:
1252 OPTSET2(INP_ORIGDSTADDR, optval);
1253 break;
1254
1255 case IP_RECVTTL:
1256 OPTSET(INP_RECVTTL);
1257 break;
1258
1259 case IP_RECVIF:
1260 OPTSET(INP_RECVIF);
1261 break;
1262
1263 case IP_ONESBCAST:
1264 OPTSET(INP_ONESBCAST);
1265 break;
1266 case IP_DONTFRAG:
1267 OPTSET(INP_DONTFRAG);
1268 break;
1269 case IP_BINDANY:
1270 OPTSET(INP_BINDANY);
1271 break;
1272 case IP_RECVTOS:
1273 OPTSET(INP_RECVTOS);
1274 break;
1275 case IP_RECVFLOWID:
1276 OPTSET2(INP_RECVFLOWID, optval);
1277 break;
1278 #ifdef RSS
1279 case IP_RECVRSSBUCKETID:
1280 OPTSET2(INP_RECVRSSBUCKETID, optval);
1281 break;
1282 #endif
1283 case IP_VLAN_PCP:
1284 if ((optval >= -1) && (optval <=
1285 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1286 if (optval == -1) {
1287 INP_WLOCK(inp);
1288 inp->inp_flags2 &=
1289 ~(INP_2PCP_SET |
1290 INP_2PCP_MASK);
1291 INP_WUNLOCK(inp);
1292 } else {
1293 INP_WLOCK(inp);
1294 inp->inp_flags2 |=
1295 INP_2PCP_SET;
1296 inp->inp_flags2 &=
1297 ~INP_2PCP_MASK;
1298 inp->inp_flags2 |=
1299 optval << INP_2PCP_SHIFT;
1300 INP_WUNLOCK(inp);
1301 }
1302 } else
1303 error = EINVAL;
1304 break;
1305 }
1306 break;
1307 #undef OPTSET
1308 #undef OPTSET2
1309
1310 /*
1311 * Multicast socket options are processed by the in_mcast
1312 * module.
1313 */
1314 case IP_MULTICAST_IF:
1315 case IP_MULTICAST_VIF:
1316 case IP_MULTICAST_TTL:
1317 case IP_MULTICAST_LOOP:
1318 case IP_ADD_MEMBERSHIP:
1319 case IP_DROP_MEMBERSHIP:
1320 case IP_ADD_SOURCE_MEMBERSHIP:
1321 case IP_DROP_SOURCE_MEMBERSHIP:
1322 case IP_BLOCK_SOURCE:
1323 case IP_UNBLOCK_SOURCE:
1324 case IP_MSFILTER:
1325 case MCAST_JOIN_GROUP:
1326 case MCAST_LEAVE_GROUP:
1327 case MCAST_JOIN_SOURCE_GROUP:
1328 case MCAST_LEAVE_SOURCE_GROUP:
1329 case MCAST_BLOCK_SOURCE:
1330 case MCAST_UNBLOCK_SOURCE:
1331 error = inp_setmoptions(inp, sopt);
1332 break;
1333
1334 case IP_PORTRANGE:
1335 error = sooptcopyin(sopt, &optval, sizeof optval,
1336 sizeof optval);
1337 if (error)
1338 break;
1339
1340 INP_WLOCK(inp);
1341 switch (optval) {
1342 case IP_PORTRANGE_DEFAULT:
1343 inp->inp_flags &= ~(INP_LOWPORT);
1344 inp->inp_flags &= ~(INP_HIGHPORT);
1345 break;
1346
1347 case IP_PORTRANGE_HIGH:
1348 inp->inp_flags &= ~(INP_LOWPORT);
1349 inp->inp_flags |= INP_HIGHPORT;
1350 break;
1351
1352 case IP_PORTRANGE_LOW:
1353 inp->inp_flags &= ~(INP_HIGHPORT);
1354 inp->inp_flags |= INP_LOWPORT;
1355 break;
1356
1357 default:
1358 error = EINVAL;
1359 break;
1360 }
1361 INP_WUNLOCK(inp);
1362 break;
1363
1364 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1365 case IP_IPSEC_POLICY:
1366 if (IPSEC_ENABLED(ipv4)) {
1367 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1368 break;
1369 }
1370 /* FALLTHROUGH */
1371 #endif /* IPSEC */
1372
1373 default:
1374 error = ENOPROTOOPT;
1375 break;
1376 }
1377 break;
1378
1379 case SOPT_GET:
1380 switch (sopt->sopt_name) {
1381 case IP_OPTIONS:
1382 case IP_RETOPTS:
1383 INP_RLOCK(inp);
1384 if (inp->inp_options) {
1385 struct mbuf *options;
1386
1387 options = m_copym(inp->inp_options, 0,
1388 M_COPYALL, M_NOWAIT);
1389 INP_RUNLOCK(inp);
1390 if (options != NULL) {
1391 error = sooptcopyout(sopt,
1392 mtod(options, char *),
1393 options->m_len);
1394 m_freem(options);
1395 } else
1396 error = ENOMEM;
1397 } else {
1398 INP_RUNLOCK(inp);
1399 sopt->sopt_valsize = 0;
1400 }
1401 break;
1402
1403 case IP_TOS:
1404 case IP_TTL:
1405 case IP_MINTTL:
1406 case IP_RECVOPTS:
1407 case IP_RECVRETOPTS:
1408 case IP_ORIGDSTADDR:
1409 case IP_RECVDSTADDR:
1410 case IP_RECVTTL:
1411 case IP_RECVIF:
1412 case IP_PORTRANGE:
1413 case IP_ONESBCAST:
1414 case IP_DONTFRAG:
1415 case IP_BINDANY:
1416 case IP_RECVTOS:
1417 case IP_FLOWID:
1418 case IP_FLOWTYPE:
1419 case IP_RECVFLOWID:
1420 #ifdef RSS
1421 case IP_RSSBUCKETID:
1422 case IP_RECVRSSBUCKETID:
1423 #endif
1424 case IP_VLAN_PCP:
1425 switch (sopt->sopt_name) {
1426 case IP_TOS:
1427 optval = inp->inp_ip_tos;
1428 break;
1429
1430 case IP_TTL:
1431 optval = inp->inp_ip_ttl;
1432 break;
1433
1434 case IP_MINTTL:
1435 optval = inp->inp_ip_minttl;
1436 break;
1437
1438 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
1439 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0)
1440
1441 case IP_RECVOPTS:
1442 optval = OPTBIT(INP_RECVOPTS);
1443 break;
1444
1445 case IP_RECVRETOPTS:
1446 optval = OPTBIT(INP_RECVRETOPTS);
1447 break;
1448
1449 case IP_RECVDSTADDR:
1450 optval = OPTBIT(INP_RECVDSTADDR);
1451 break;
1452
1453 case IP_ORIGDSTADDR:
1454 optval = OPTBIT2(INP_ORIGDSTADDR);
1455 break;
1456
1457 case IP_RECVTTL:
1458 optval = OPTBIT(INP_RECVTTL);
1459 break;
1460
1461 case IP_RECVIF:
1462 optval = OPTBIT(INP_RECVIF);
1463 break;
1464
1465 case IP_PORTRANGE:
1466 if (inp->inp_flags & INP_HIGHPORT)
1467 optval = IP_PORTRANGE_HIGH;
1468 else if (inp->inp_flags & INP_LOWPORT)
1469 optval = IP_PORTRANGE_LOW;
1470 else
1471 optval = 0;
1472 break;
1473
1474 case IP_ONESBCAST:
1475 optval = OPTBIT(INP_ONESBCAST);
1476 break;
1477 case IP_DONTFRAG:
1478 optval = OPTBIT(INP_DONTFRAG);
1479 break;
1480 case IP_BINDANY:
1481 optval = OPTBIT(INP_BINDANY);
1482 break;
1483 case IP_RECVTOS:
1484 optval = OPTBIT(INP_RECVTOS);
1485 break;
1486 case IP_FLOWID:
1487 optval = inp->inp_flowid;
1488 break;
1489 case IP_FLOWTYPE:
1490 optval = inp->inp_flowtype;
1491 break;
1492 case IP_RECVFLOWID:
1493 optval = OPTBIT2(INP_RECVFLOWID);
1494 break;
1495 #ifdef RSS
1496 case IP_RSSBUCKETID:
1497 retval = rss_hash2bucket(inp->inp_flowid,
1498 inp->inp_flowtype,
1499 &rss_bucket);
1500 if (retval == 0)
1501 optval = rss_bucket;
1502 else
1503 error = EINVAL;
1504 break;
1505 case IP_RECVRSSBUCKETID:
1506 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1507 break;
1508 #endif
1509 case IP_VLAN_PCP:
1510 if (OPTBIT2(INP_2PCP_SET)) {
1511 optval = (inp->inp_flags2 &
1512 INP_2PCP_MASK) >> INP_2PCP_SHIFT;
1513 } else {
1514 optval = -1;
1515 }
1516 break;
1517 }
1518 error = sooptcopyout(sopt, &optval, sizeof optval);
1519 break;
1520
1521 /*
1522 * Multicast socket options are processed by the in_mcast
1523 * module.
1524 */
1525 case IP_MULTICAST_IF:
1526 case IP_MULTICAST_VIF:
1527 case IP_MULTICAST_TTL:
1528 case IP_MULTICAST_LOOP:
1529 case IP_MSFILTER:
1530 error = inp_getmoptions(inp, sopt);
1531 break;
1532
1533 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1534 case IP_IPSEC_POLICY:
1535 if (IPSEC_ENABLED(ipv4)) {
1536 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1537 break;
1538 }
1539 /* FALLTHROUGH */
1540 #endif /* IPSEC */
1541
1542 default:
1543 error = ENOPROTOOPT;
1544 break;
1545 }
1546 break;
1547 }
1548 return (error);
1549 }
1550
1551 /*
1552 * Routine called from ip_output() to loop back a copy of an IP multicast
1553 * packet to the input queue of a specified interface. Note that this
1554 * calls the output routine of the loopback "driver", but with an interface
1555 * pointer that might NOT be a loopback interface -- evil, but easier than
1556 * replicating that code here.
1557 */
1558 static void
ip_mloopback(struct ifnet * ifp,const struct mbuf * m,int hlen)1559 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1560 {
1561 struct ip *ip;
1562 struct mbuf *copym;
1563
1564 /*
1565 * Make a deep copy of the packet because we're going to
1566 * modify the pack in order to generate checksums.
1567 */
1568 copym = m_dup(m, M_NOWAIT);
1569 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1570 copym = m_pullup(copym, hlen);
1571 if (copym != NULL) {
1572 /* If needed, compute the checksum and mark it as valid. */
1573 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1574 in_delayed_cksum(copym);
1575 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1576 copym->m_pkthdr.csum_flags |=
1577 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1578 copym->m_pkthdr.csum_data = 0xffff;
1579 }
1580 /*
1581 * We don't bother to fragment if the IP length is greater
1582 * than the interface's MTU. Can this possibly matter?
1583 */
1584 ip = mtod(copym, struct ip *);
1585 ip->ip_sum = 0;
1586 ip->ip_sum = in_cksum(copym, hlen);
1587 if_simloop(ifp, copym, AF_INET, 0);
1588 }
1589 }
1590