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