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: releng/12.0/sys/netinet/ip_output.c 339219 2018-10-07 11:26:15Z tuexen $");
36
37 #include "opt_inet.h"
38 #include "opt_ratelimit.h"
39 #include "opt_ipsec.h"
40 #include "opt_mbuf_stress_test.h"
41 #include "opt_mpath.h"
42 #include "opt_route.h"
43 #include "opt_sctp.h"
44 #include "opt_rss.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/lock.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52 #include <sys/priv.h>
53 #include <sys/proc.h>
54 #include <sys/protosw.h>
55 #include <sys/rmlock.h>
56 #include <sys/sdt.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/sysctl.h>
60 #include <sys/ucred.h>
61
62 #include <net/if.h>
63 #include <net/if_var.h>
64 #include <net/if_llatbl.h>
65 #include <net/netisr.h>
66 #include <net/pfil.h>
67 #include <net/route.h>
68 #ifdef RADIX_MPATH
69 #include <net/radix_mpath.h>
70 #endif
71 #include <net/rss_config.h>
72 #include <net/vnet.h>
73
74 #include <netinet/in.h>
75 #include <netinet/in_kdtrace.h>
76 #include <netinet/in_systm.h>
77 #include <netinet/ip.h>
78 #include <netinet/in_pcb.h>
79 #include <netinet/in_rss.h>
80 #include <netinet/in_var.h>
81 #include <netinet/ip_var.h>
82 #include <netinet/ip_options.h>
83
84 #include <netinet/udp.h>
85 #include <netinet/udp_var.h>
86
87 #ifdef SCTP
88 #include <netinet/sctp.h>
89 #include <netinet/sctp_crc32.h>
90 #endif
91
92 #include <netipsec/ipsec_support.h>
93
94 #include <machine/in_cksum.h>
95
96 #include <security/mac/mac_framework.h>
97
98 #ifdef MBUF_STRESS_TEST
99 static int mbuf_frag_size = 0;
100 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
101 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
102 #endif
103
104 static void ip_mloopback(struct ifnet *, const struct mbuf *, int);
105
106
107 extern int in_mcast_loop;
108 extern struct protosw inetsw[];
109
110 static inline int
111 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp,
112 struct sockaddr_in *dst, int *fibnum, int *error)
113 {
114 struct m_tag *fwd_tag = NULL;
115 struct mbuf *m;
116 struct in_addr odst;
117 struct ip *ip;
118
119 m = *mp;
120 ip = mtod(m, struct ip *);
121
122 /* Run through list of hooks for output packets. */
123 odst.s_addr = ip->ip_dst.s_addr;
124 *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, 0, inp);
125 m = *mp;
126 if ((*error) != 0 || m == NULL)
127 return 1; /* Finished */
128
129 ip = mtod(m, struct ip *);
130
131 /* See if destination IP address was changed by packet filter. */
132 if (odst.s_addr != ip->ip_dst.s_addr) {
133 m->m_flags |= M_SKIP_FIREWALL;
134 /* If destination is now ourself drop to ip_input(). */
135 if (in_localip(ip->ip_dst)) {
136 m->m_flags |= M_FASTFWD_OURS;
137 if (m->m_pkthdr.rcvif == NULL)
138 m->m_pkthdr.rcvif = V_loif;
139 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
140 m->m_pkthdr.csum_flags |=
141 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
142 m->m_pkthdr.csum_data = 0xffff;
143 }
144 m->m_pkthdr.csum_flags |=
145 CSUM_IP_CHECKED | CSUM_IP_VALID;
146 #ifdef SCTP
147 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
148 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
149 #endif
150 *error = netisr_queue(NETISR_IP, m);
151 return 1; /* Finished */
152 }
153
154 bzero(dst, sizeof(*dst));
155 dst->sin_family = AF_INET;
156 dst->sin_len = sizeof(*dst);
157 dst->sin_addr = ip->ip_dst;
158
159 return -1; /* Reloop */
160 }
161 /* See if fib was changed by packet filter. */
162 if ((*fibnum) != M_GETFIB(m)) {
163 m->m_flags |= M_SKIP_FIREWALL;
164 *fibnum = M_GETFIB(m);
165 return -1; /* Reloop for FIB change */
166 }
167
168 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
169 if (m->m_flags & M_FASTFWD_OURS) {
170 if (m->m_pkthdr.rcvif == NULL)
171 m->m_pkthdr.rcvif = V_loif;
172 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
173 m->m_pkthdr.csum_flags |=
174 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
175 m->m_pkthdr.csum_data = 0xffff;
176 }
177 #ifdef SCTP
178 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
179 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
180 #endif
181 m->m_pkthdr.csum_flags |=
182 CSUM_IP_CHECKED | CSUM_IP_VALID;
183
184 *error = netisr_queue(NETISR_IP, m);
185 return 1; /* Finished */
186 }
187 /* Or forward to some other address? */
188 if ((m->m_flags & M_IP_NEXTHOP) &&
189 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
190 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
191 m->m_flags |= M_SKIP_FIREWALL;
192 m->m_flags &= ~M_IP_NEXTHOP;
193 m_tag_delete(m, fwd_tag);
194
195 return -1; /* Reloop for CHANGE of dst */
196 }
197
198 return 0;
199 }
200
201 /*
202 * IP output. The packet in mbuf chain m contains a skeletal IP
203 * header (with len, off, ttl, proto, tos, src, dst).
204 * The mbuf chain containing the packet will be freed.
205 * The mbuf opt, if present, will not be freed.
206 * If route ro is present and has ro_rt initialized, route lookup would be
207 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
208 * then result of route lookup is stored in ro->ro_rt.
209 *
210 * In the IP forwarding case, the packet will arrive with options already
211 * inserted, so must have a NULL opt pointer.
212 */
213 int
214 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
215 struct ip_moptions *imo, struct inpcb *inp)
216 {
217 struct rm_priotracker in_ifa_tracker;
218 struct ip *ip;
219 struct ifnet *ifp = NULL; /* keep compiler happy */
220 struct mbuf *m0;
221 int hlen = sizeof (struct ip);
222 int mtu;
223 int error = 0;
224 struct sockaddr_in *dst;
225 const struct sockaddr_in *gw;
226 struct in_ifaddr *ia;
227 int isbroadcast;
228 uint16_t ip_len, ip_off;
229 struct route iproute;
230 struct rtentry *rte; /* cache for ro->ro_rt */
231 uint32_t fibnum;
232 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
233 int no_route_but_check_spd = 0;
234 #endif
235 M_ASSERTPKTHDR(m);
236
237 if (inp != NULL) {
238 INP_LOCK_ASSERT(inp);
239 M_SETFIB(m, inp->inp_inc.inc_fibnum);
240 if ((flags & IP_NODEFAULTFLOWID) == 0) {
241 m->m_pkthdr.flowid = inp->inp_flowid;
242 M_HASHTYPE_SET(m, inp->inp_flowtype);
243 }
244 }
245
246 if (ro == NULL) {
247 ro = &iproute;
248 bzero(ro, sizeof (*ro));
249 }
250
251 if (opt) {
252 int len = 0;
253 m = ip_insertoptions(m, opt, &len);
254 if (len != 0)
255 hlen = len; /* ip->ip_hl is updated above */
256 }
257 ip = mtod(m, struct ip *);
258 ip_len = ntohs(ip->ip_len);
259 ip_off = ntohs(ip->ip_off);
260
261 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
262 ip->ip_v = IPVERSION;
263 ip->ip_hl = hlen >> 2;
264 ip_fillid(ip);
265 } else {
266 /* Header already set, fetch hlen from there */
267 hlen = ip->ip_hl << 2;
268 }
269 if ((flags & IP_FORWARDING) == 0)
270 IPSTAT_INC(ips_localout);
271
272 /*
273 * dst/gw handling:
274 *
275 * dst can be rewritten but always points to &ro->ro_dst.
276 * gw is readonly but can point either to dst OR rt_gateway,
277 * therefore we need restore gw if we're redoing lookup.
278 */
279 gw = dst = (struct sockaddr_in *)&ro->ro_dst;
280 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
281 rte = ro->ro_rt;
282 if (rte == NULL) {
283 bzero(dst, sizeof(*dst));
284 dst->sin_family = AF_INET;
285 dst->sin_len = sizeof(*dst);
286 dst->sin_addr = ip->ip_dst;
287 }
288 NET_EPOCH_ENTER();
289 again:
290 /*
291 * Validate route against routing table additions;
292 * a better/more specific route might have been added.
293 */
294 if (inp)
295 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
296 /*
297 * If there is a cached route,
298 * check that it is to the same destination
299 * and is still up. If not, free it and try again.
300 * The address family should also be checked in case of sharing the
301 * cache with IPv6.
302 * Also check whether routing cache needs invalidation.
303 */
304 rte = ro->ro_rt;
305 if (rte && ((rte->rt_flags & RTF_UP) == 0 ||
306 rte->rt_ifp == NULL ||
307 !RT_LINK_IS_UP(rte->rt_ifp) ||
308 dst->sin_family != AF_INET ||
309 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
310 RO_INVALIDATE_CACHE(ro);
311 rte = NULL;
312 }
313 ia = NULL;
314 /*
315 * If routing to interface only, short circuit routing lookup.
316 * The use of an all-ones broadcast address implies this; an
317 * interface is specified by the broadcast address of an interface,
318 * or the destination address of a ptp interface.
319 */
320 if (flags & IP_SENDONES) {
321 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
322 M_GETFIB(m)))) == NULL &&
323 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
324 M_GETFIB(m)))) == NULL) {
325 IPSTAT_INC(ips_noroute);
326 error = ENETUNREACH;
327 goto bad;
328 }
329 ip->ip_dst.s_addr = INADDR_BROADCAST;
330 dst->sin_addr = ip->ip_dst;
331 ifp = ia->ia_ifp;
332 ip->ip_ttl = 1;
333 isbroadcast = 1;
334 } else if (flags & IP_ROUTETOIF) {
335 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
336 M_GETFIB(m)))) == NULL &&
337 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
338 M_GETFIB(m)))) == NULL) {
339 IPSTAT_INC(ips_noroute);
340 error = ENETUNREACH;
341 goto bad;
342 }
343 ifp = ia->ia_ifp;
344 ip->ip_ttl = 1;
345 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
346 in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
347 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
348 imo != NULL && imo->imo_multicast_ifp != NULL) {
349 /*
350 * Bypass the normal routing lookup for multicast
351 * packets if the interface is specified.
352 */
353 ifp = imo->imo_multicast_ifp;
354 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
355 isbroadcast = 0; /* fool gcc */
356 } else {
357 /*
358 * We want to do any cloning requested by the link layer,
359 * as this is probably required in all cases for correct
360 * operation (as it is for ARP).
361 */
362 if (rte == NULL) {
363 #ifdef RADIX_MPATH
364 rtalloc_mpath_fib(ro,
365 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
366 fibnum);
367 #else
368 in_rtalloc_ign(ro, 0, fibnum);
369 #endif
370 rte = ro->ro_rt;
371 }
372 if (rte == NULL ||
373 (rte->rt_flags & RTF_UP) == 0 ||
374 rte->rt_ifp == NULL ||
375 !RT_LINK_IS_UP(rte->rt_ifp)) {
376 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
377 /*
378 * There is no route for this packet, but it is
379 * possible that a matching SPD entry exists.
380 */
381 no_route_but_check_spd = 1;
382 mtu = 0; /* Silence GCC warning. */
383 goto sendit;
384 #endif
385 IPSTAT_INC(ips_noroute);
386 error = EHOSTUNREACH;
387 goto bad;
388 }
389 ia = ifatoia(rte->rt_ifa);
390 ifp = rte->rt_ifp;
391 counter_u64_add(rte->rt_pksent, 1);
392 rt_update_ro_flags(ro);
393 if (rte->rt_flags & RTF_GATEWAY)
394 gw = (struct sockaddr_in *)rte->rt_gateway;
395 if (rte->rt_flags & RTF_HOST)
396 isbroadcast = (rte->rt_flags & RTF_BROADCAST);
397 else if (ifp->if_flags & IFF_BROADCAST)
398 isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
399 else
400 isbroadcast = 0;
401 }
402
403 /*
404 * Calculate MTU. If we have a route that is up, use that,
405 * otherwise use the interface's MTU.
406 */
407 if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
408 mtu = rte->rt_mtu;
409 else
410 mtu = ifp->if_mtu;
411 /* Catch a possible divide by zero later. */
412 KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
413 __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
414
415 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
416 m->m_flags |= M_MCAST;
417 /*
418 * IP destination address is multicast. Make sure "gw"
419 * still points to the address in "ro". (It may have been
420 * changed to point to a gateway address, above.)
421 */
422 gw = dst;
423 /*
424 * See if the caller provided any multicast options
425 */
426 if (imo != NULL) {
427 ip->ip_ttl = imo->imo_multicast_ttl;
428 if (imo->imo_multicast_vif != -1)
429 ip->ip_src.s_addr =
430 ip_mcast_src ?
431 ip_mcast_src(imo->imo_multicast_vif) :
432 INADDR_ANY;
433 } else
434 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
435 /*
436 * Confirm that the outgoing interface supports multicast.
437 */
438 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
439 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
440 IPSTAT_INC(ips_noroute);
441 error = ENETUNREACH;
442 goto bad;
443 }
444 }
445 /*
446 * If source address not specified yet, use address
447 * of outgoing interface.
448 */
449 if (ip->ip_src.s_addr == INADDR_ANY) {
450 /* Interface may have no addresses. */
451 if (ia != NULL)
452 ip->ip_src = IA_SIN(ia)->sin_addr;
453 }
454
455 if ((imo == NULL && in_mcast_loop) ||
456 (imo && imo->imo_multicast_loop)) {
457 /*
458 * Loop back multicast datagram if not expressly
459 * forbidden to do so, even if we are not a member
460 * of the group; ip_input() will filter it later,
461 * thus deferring a hash lookup and mutex acquisition
462 * at the expense of a cheap copy using m_copym().
463 */
464 ip_mloopback(ifp, m, hlen);
465 } else {
466 /*
467 * If we are acting as a multicast router, perform
468 * multicast forwarding as if the packet had just
469 * arrived on the interface to which we are about
470 * to send. The multicast forwarding function
471 * recursively calls this function, using the
472 * IP_FORWARDING flag to prevent infinite recursion.
473 *
474 * Multicasts that are looped back by ip_mloopback(),
475 * above, will be forwarded by the ip_input() routine,
476 * if necessary.
477 */
478 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
479 /*
480 * If rsvp daemon is not running, do not
481 * set ip_moptions. This ensures that the packet
482 * is multicast and not just sent down one link
483 * as prescribed by rsvpd.
484 */
485 if (!V_rsvp_on)
486 imo = NULL;
487 if (ip_mforward &&
488 ip_mforward(ip, ifp, m, imo) != 0) {
489 m_freem(m);
490 goto done;
491 }
492 }
493 }
494
495 /*
496 * Multicasts with a time-to-live of zero may be looped-
497 * back, above, but must not be transmitted on a network.
498 * Also, multicasts addressed to the loopback interface
499 * are not sent -- the above call to ip_mloopback() will
500 * loop back a copy. ip_input() will drop the copy if
501 * this host does not belong to the destination group on
502 * the loopback interface.
503 */
504 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
505 m_freem(m);
506 goto done;
507 }
508
509 goto sendit;
510 }
511
512 /*
513 * If the source address is not specified yet, use the address
514 * of the outoing interface.
515 */
516 if (ip->ip_src.s_addr == INADDR_ANY) {
517 /* Interface may have no addresses. */
518 if (ia != NULL) {
519 ip->ip_src = IA_SIN(ia)->sin_addr;
520 }
521 }
522
523 /*
524 * Look for broadcast address and
525 * verify user is allowed to send
526 * such a packet.
527 */
528 if (isbroadcast) {
529 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
530 error = EADDRNOTAVAIL;
531 goto bad;
532 }
533 if ((flags & IP_ALLOWBROADCAST) == 0) {
534 error = EACCES;
535 goto bad;
536 }
537 /* don't allow broadcast messages to be fragmented */
538 if (ip_len > mtu) {
539 error = EMSGSIZE;
540 goto bad;
541 }
542 m->m_flags |= M_BCAST;
543 } else {
544 m->m_flags &= ~M_BCAST;
545 }
546
547 sendit:
548 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
549 if (IPSEC_ENABLED(ipv4)) {
550 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
551 if (error == EINPROGRESS)
552 error = 0;
553 goto done;
554 }
555 }
556 /*
557 * Check if there was a route for this packet; return error if not.
558 */
559 if (no_route_but_check_spd) {
560 IPSTAT_INC(ips_noroute);
561 error = EHOSTUNREACH;
562 goto bad;
563 }
564 /* Update variables that are affected by ipsec4_output(). */
565 ip = mtod(m, struct ip *);
566 hlen = ip->ip_hl << 2;
567 #endif /* IPSEC */
568
569 /* Jump over all PFIL processing if hooks are not active. */
570 if (PFIL_HOOKED(&V_inet_pfil_hook)) {
571 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
572 case 1: /* Finished */
573 goto done;
574
575 case 0: /* Continue normally */
576 ip = mtod(m, struct ip *);
577 break;
578
579 case -1: /* Need to try again */
580 /* Reset everything for a new round */
581 RO_RTFREE(ro);
582 ro->ro_prepend = NULL;
583 rte = NULL;
584 gw = dst;
585 ip = mtod(m, struct ip *);
586 goto again;
587
588 }
589 }
590
591 /* 127/8 must not appear on wire - RFC1122. */
592 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
593 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
594 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
595 IPSTAT_INC(ips_badaddr);
596 error = EADDRNOTAVAIL;
597 goto bad;
598 }
599 }
600
601 m->m_pkthdr.csum_flags |= CSUM_IP;
602 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
603 in_delayed_cksum(m);
604 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
605 }
606 #ifdef SCTP
607 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
608 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
609 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
610 }
611 #endif
612
613 /*
614 * If small enough for interface, or the interface will take
615 * care of the fragmentation for us, we can just send directly.
616 */
617 if (ip_len <= mtu ||
618 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
619 ip->ip_sum = 0;
620 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
621 ip->ip_sum = in_cksum(m, hlen);
622 m->m_pkthdr.csum_flags &= ~CSUM_IP;
623 }
624
625 /*
626 * Record statistics for this interface address.
627 * With CSUM_TSO the byte/packet count will be slightly
628 * incorrect because we count the IP+TCP headers only
629 * once instead of for every generated packet.
630 */
631 if (!(flags & IP_FORWARDING) && ia) {
632 if (m->m_pkthdr.csum_flags & CSUM_TSO)
633 counter_u64_add(ia->ia_ifa.ifa_opackets,
634 m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
635 else
636 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
637
638 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
639 }
640 #ifdef MBUF_STRESS_TEST
641 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
642 m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
643 #endif
644 /*
645 * Reset layer specific mbuf flags
646 * to avoid confusing lower layers.
647 */
648 m_clrprotoflags(m);
649 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
650 #ifdef RATELIMIT
651 if (inp != NULL) {
652 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
653 in_pcboutput_txrtlmt(inp, ifp, m);
654 /* stamp send tag on mbuf */
655 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
656 } else {
657 m->m_pkthdr.snd_tag = NULL;
658 }
659 #endif
660 error = (*ifp->if_output)(ifp, m,
661 (const struct sockaddr *)gw, ro);
662 #ifdef RATELIMIT
663 /* check for route change */
664 if (error == EAGAIN)
665 in_pcboutput_eagain(inp);
666 #endif
667 goto done;
668 }
669
670 /* Balk when DF bit is set or the interface didn't support TSO. */
671 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
672 error = EMSGSIZE;
673 IPSTAT_INC(ips_cantfrag);
674 goto bad;
675 }
676
677 /*
678 * Too large for interface; fragment if possible. If successful,
679 * on return, m will point to a list of packets to be sent.
680 */
681 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
682 if (error)
683 goto bad;
684 for (; m; m = m0) {
685 m0 = m->m_nextpkt;
686 m->m_nextpkt = 0;
687 if (error == 0) {
688 /* Record statistics for this interface address. */
689 if (ia != NULL) {
690 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
691 counter_u64_add(ia->ia_ifa.ifa_obytes,
692 m->m_pkthdr.len);
693 }
694 /*
695 * Reset layer specific mbuf flags
696 * to avoid confusing upper layers.
697 */
698 m_clrprotoflags(m);
699
700 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
701 mtod(m, struct ip *), NULL);
702 #ifdef RATELIMIT
703 if (inp != NULL) {
704 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
705 in_pcboutput_txrtlmt(inp, ifp, m);
706 /* stamp send tag on mbuf */
707 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
708 } else {
709 m->m_pkthdr.snd_tag = NULL;
710 }
711 #endif
712 error = (*ifp->if_output)(ifp, m,
713 (const struct sockaddr *)gw, ro);
714 #ifdef RATELIMIT
715 /* check for route change */
716 if (error == EAGAIN)
717 in_pcboutput_eagain(inp);
718 #endif
719 } else
720 m_freem(m);
721 }
722
723 if (error == 0)
724 IPSTAT_INC(ips_fragmented);
725
726 done:
727 if (ro == &iproute)
728 RO_RTFREE(ro);
729 else if (rte == NULL)
730 /*
731 * If the caller supplied a route but somehow the reference
732 * to it has been released need to prevent the caller
733 * calling RTFREE on it again.
734 */
735 ro->ro_rt = NULL;
736 NET_EPOCH_EXIT();
737 return (error);
738 bad:
739 m_freem(m);
740 goto done;
741 }
742
743 /*
744 * Create a chain of fragments which fit the given mtu. m_frag points to the
745 * mbuf to be fragmented; on return it points to the chain with the fragments.
746 * Return 0 if no error. If error, m_frag may contain a partially built
747 * chain of fragments that should be freed by the caller.
748 *
749 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
750 */
751 int
752 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
753 u_long if_hwassist_flags)
754 {
755 int error = 0;
756 int hlen = ip->ip_hl << 2;
757 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
758 int off;
759 struct mbuf *m0 = *m_frag; /* the original packet */
760 int firstlen;
761 struct mbuf **mnext;
762 int nfrags;
763 uint16_t ip_len, ip_off;
764
765 ip_len = ntohs(ip->ip_len);
766 ip_off = ntohs(ip->ip_off);
767
768 if (ip_off & IP_DF) { /* Fragmentation not allowed */
769 IPSTAT_INC(ips_cantfrag);
770 return EMSGSIZE;
771 }
772
773 /*
774 * Must be able to put at least 8 bytes per fragment.
775 */
776 if (len < 8)
777 return EMSGSIZE;
778
779 /*
780 * If the interface will not calculate checksums on
781 * fragmented packets, then do it here.
782 */
783 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
784 in_delayed_cksum(m0);
785 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
786 }
787 #ifdef SCTP
788 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
789 sctp_delayed_cksum(m0, hlen);
790 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
791 }
792 #endif
793 if (len > PAGE_SIZE) {
794 /*
795 * Fragment large datagrams such that each segment
796 * contains a multiple of PAGE_SIZE amount of data,
797 * plus headers. This enables a receiver to perform
798 * page-flipping zero-copy optimizations.
799 *
800 * XXX When does this help given that sender and receiver
801 * could have different page sizes, and also mtu could
802 * be less than the receiver's page size ?
803 */
804 int newlen;
805
806 off = MIN(mtu, m0->m_pkthdr.len);
807
808 /*
809 * firstlen (off - hlen) must be aligned on an
810 * 8-byte boundary
811 */
812 if (off < hlen)
813 goto smart_frag_failure;
814 off = ((off - hlen) & ~7) + hlen;
815 newlen = (~PAGE_MASK) & mtu;
816 if ((newlen + sizeof (struct ip)) > mtu) {
817 /* we failed, go back the default */
818 smart_frag_failure:
819 newlen = len;
820 off = hlen + len;
821 }
822 len = newlen;
823
824 } else {
825 off = hlen + len;
826 }
827
828 firstlen = off - hlen;
829 mnext = &m0->m_nextpkt; /* pointer to next packet */
830
831 /*
832 * Loop through length of segment after first fragment,
833 * make new header and copy data of each part and link onto chain.
834 * Here, m0 is the original packet, m is the fragment being created.
835 * The fragments are linked off the m_nextpkt of the original
836 * packet, which after processing serves as the first fragment.
837 */
838 for (nfrags = 1; off < ip_len; off += len, nfrags++) {
839 struct ip *mhip; /* ip header on the fragment */
840 struct mbuf *m;
841 int mhlen = sizeof (struct ip);
842
843 m = m_gethdr(M_NOWAIT, MT_DATA);
844 if (m == NULL) {
845 error = ENOBUFS;
846 IPSTAT_INC(ips_odropped);
847 goto done;
848 }
849 /*
850 * Make sure the complete packet header gets copied
851 * from the originating mbuf to the newly created
852 * mbuf. This also ensures that existing firewall
853 * classification(s), VLAN tags and so on get copied
854 * to the resulting fragmented packet(s):
855 */
856 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
857 m_free(m);
858 error = ENOBUFS;
859 IPSTAT_INC(ips_odropped);
860 goto done;
861 }
862 /*
863 * In the first mbuf, leave room for the link header, then
864 * copy the original IP header including options. The payload
865 * goes into an additional mbuf chain returned by m_copym().
866 */
867 m->m_data += max_linkhdr;
868 mhip = mtod(m, struct ip *);
869 *mhip = *ip;
870 if (hlen > sizeof (struct ip)) {
871 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
872 mhip->ip_v = IPVERSION;
873 mhip->ip_hl = mhlen >> 2;
874 }
875 m->m_len = mhlen;
876 /* XXX do we need to add ip_off below ? */
877 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
878 if (off + len >= ip_len)
879 len = ip_len - off;
880 else
881 mhip->ip_off |= IP_MF;
882 mhip->ip_len = htons((u_short)(len + mhlen));
883 m->m_next = m_copym(m0, off, len, M_NOWAIT);
884 if (m->m_next == NULL) { /* copy failed */
885 m_free(m);
886 error = ENOBUFS; /* ??? */
887 IPSTAT_INC(ips_odropped);
888 goto done;
889 }
890 m->m_pkthdr.len = mhlen + len;
891 #ifdef MAC
892 mac_netinet_fragment(m0, m);
893 #endif
894 mhip->ip_off = htons(mhip->ip_off);
895 mhip->ip_sum = 0;
896 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
897 mhip->ip_sum = in_cksum(m, mhlen);
898 m->m_pkthdr.csum_flags &= ~CSUM_IP;
899 }
900 *mnext = m;
901 mnext = &m->m_nextpkt;
902 }
903 IPSTAT_ADD(ips_ofragments, nfrags);
904
905 /*
906 * Update first fragment by trimming what's been copied out
907 * and updating header.
908 */
909 m_adj(m0, hlen + firstlen - ip_len);
910 m0->m_pkthdr.len = hlen + firstlen;
911 ip->ip_len = htons((u_short)m0->m_pkthdr.len);
912 ip->ip_off = htons(ip_off | IP_MF);
913 ip->ip_sum = 0;
914 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
915 ip->ip_sum = in_cksum(m0, hlen);
916 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
917 }
918
919 done:
920 *m_frag = m0;
921 return error;
922 }
923
924 void
925 in_delayed_cksum(struct mbuf *m)
926 {
927 struct ip *ip;
928 struct udphdr *uh;
929 uint16_t cklen, csum, offset;
930
931 ip = mtod(m, struct ip *);
932 offset = ip->ip_hl << 2 ;
933
934 if (m->m_pkthdr.csum_flags & CSUM_UDP) {
935 /* if udp header is not in the first mbuf copy udplen */
936 if (offset + sizeof(struct udphdr) > m->m_len) {
937 m_copydata(m, offset + offsetof(struct udphdr,
938 uh_ulen), sizeof(cklen), (caddr_t)&cklen);
939 cklen = ntohs(cklen);
940 } else {
941 uh = (struct udphdr *)mtodo(m, offset);
942 cklen = ntohs(uh->uh_ulen);
943 }
944 csum = in_cksum_skip(m, cklen + offset, offset);
945 if (csum == 0)
946 csum = 0xffff;
947 } else {
948 cklen = ntohs(ip->ip_len);
949 csum = in_cksum_skip(m, cklen, offset);
950 }
951 offset += m->m_pkthdr.csum_data; /* checksum offset */
952
953 if (offset + sizeof(csum) > m->m_len)
954 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
955 else
956 *(u_short *)mtodo(m, offset) = csum;
957 }
958
959 /*
960 * IP socket option processing.
961 */
962 int
963 ip_ctloutput(struct socket *so, struct sockopt *sopt)
964 {
965 struct inpcb *inp = sotoinpcb(so);
966 int error, optval;
967 #ifdef RSS
968 uint32_t rss_bucket;
969 int retval;
970 #endif
971
972 error = optval = 0;
973 if (sopt->sopt_level != IPPROTO_IP) {
974 error = EINVAL;
975
976 if (sopt->sopt_level == SOL_SOCKET &&
977 sopt->sopt_dir == SOPT_SET) {
978 switch (sopt->sopt_name) {
979 case SO_REUSEADDR:
980 INP_WLOCK(inp);
981 if ((so->so_options & SO_REUSEADDR) != 0)
982 inp->inp_flags2 |= INP_REUSEADDR;
983 else
984 inp->inp_flags2 &= ~INP_REUSEADDR;
985 INP_WUNLOCK(inp);
986 error = 0;
987 break;
988 case SO_REUSEPORT:
989 INP_WLOCK(inp);
990 if ((so->so_options & SO_REUSEPORT) != 0)
991 inp->inp_flags2 |= INP_REUSEPORT;
992 else
993 inp->inp_flags2 &= ~INP_REUSEPORT;
994 INP_WUNLOCK(inp);
995 error = 0;
996 break;
997 case SO_REUSEPORT_LB:
998 INP_WLOCK(inp);
999 if ((so->so_options & SO_REUSEPORT_LB) != 0)
1000 inp->inp_flags2 |= INP_REUSEPORT_LB;
1001 else
1002 inp->inp_flags2 &= ~INP_REUSEPORT_LB;
1003 INP_WUNLOCK(inp);
1004 error = 0;
1005 break;
1006 case SO_SETFIB:
1007 INP_WLOCK(inp);
1008 inp->inp_inc.inc_fibnum = so->so_fibnum;
1009 INP_WUNLOCK(inp);
1010 error = 0;
1011 break;
1012 case SO_MAX_PACING_RATE:
1013 #ifdef RATELIMIT
1014 INP_WLOCK(inp);
1015 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1016 INP_WUNLOCK(inp);
1017 error = 0;
1018 #else
1019 error = EOPNOTSUPP;
1020 #endif
1021 break;
1022 default:
1023 break;
1024 }
1025 }
1026 return (error);
1027 }
1028
1029 switch (sopt->sopt_dir) {
1030 case SOPT_SET:
1031 switch (sopt->sopt_name) {
1032 case IP_OPTIONS:
1033 #ifdef notyet
1034 case IP_RETOPTS:
1035 #endif
1036 {
1037 struct mbuf *m;
1038 if (sopt->sopt_valsize > MLEN) {
1039 error = EMSGSIZE;
1040 break;
1041 }
1042 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1043 if (m == NULL) {
1044 error = ENOBUFS;
1045 break;
1046 }
1047 m->m_len = sopt->sopt_valsize;
1048 error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1049 m->m_len);
1050 if (error) {
1051 m_free(m);
1052 break;
1053 }
1054 INP_WLOCK(inp);
1055 error = ip_pcbopts(inp, sopt->sopt_name, m);
1056 INP_WUNLOCK(inp);
1057 return (error);
1058 }
1059
1060 case IP_BINDANY:
1061 if (sopt->sopt_td != NULL) {
1062 error = priv_check(sopt->sopt_td,
1063 PRIV_NETINET_BINDANY);
1064 if (error)
1065 break;
1066 }
1067 /* FALLTHROUGH */
1068 case IP_BINDMULTI:
1069 #ifdef RSS
1070 case IP_RSS_LISTEN_BUCKET:
1071 #endif
1072 case IP_TOS:
1073 case IP_TTL:
1074 case IP_MINTTL:
1075 case IP_RECVOPTS:
1076 case IP_RECVRETOPTS:
1077 case IP_ORIGDSTADDR:
1078 case IP_RECVDSTADDR:
1079 case IP_RECVTTL:
1080 case IP_RECVIF:
1081 case IP_ONESBCAST:
1082 case IP_DONTFRAG:
1083 case IP_RECVTOS:
1084 case IP_RECVFLOWID:
1085 #ifdef RSS
1086 case IP_RECVRSSBUCKETID:
1087 #endif
1088 error = sooptcopyin(sopt, &optval, sizeof optval,
1089 sizeof optval);
1090 if (error)
1091 break;
1092
1093 switch (sopt->sopt_name) {
1094 case IP_TOS:
1095 inp->inp_ip_tos = optval;
1096 break;
1097
1098 case IP_TTL:
1099 inp->inp_ip_ttl = optval;
1100 break;
1101
1102 case IP_MINTTL:
1103 if (optval >= 0 && optval <= MAXTTL)
1104 inp->inp_ip_minttl = optval;
1105 else
1106 error = EINVAL;
1107 break;
1108
1109 #define OPTSET(bit) do { \
1110 INP_WLOCK(inp); \
1111 if (optval) \
1112 inp->inp_flags |= bit; \
1113 else \
1114 inp->inp_flags &= ~bit; \
1115 INP_WUNLOCK(inp); \
1116 } while (0)
1117
1118 #define OPTSET2(bit, val) do { \
1119 INP_WLOCK(inp); \
1120 if (val) \
1121 inp->inp_flags2 |= bit; \
1122 else \
1123 inp->inp_flags2 &= ~bit; \
1124 INP_WUNLOCK(inp); \
1125 } while (0)
1126
1127 case IP_RECVOPTS:
1128 OPTSET(INP_RECVOPTS);
1129 break;
1130
1131 case IP_RECVRETOPTS:
1132 OPTSET(INP_RECVRETOPTS);
1133 break;
1134
1135 case IP_RECVDSTADDR:
1136 OPTSET(INP_RECVDSTADDR);
1137 break;
1138
1139 case IP_ORIGDSTADDR:
1140 OPTSET2(INP_ORIGDSTADDR, optval);
1141 break;
1142
1143 case IP_RECVTTL:
1144 OPTSET(INP_RECVTTL);
1145 break;
1146
1147 case IP_RECVIF:
1148 OPTSET(INP_RECVIF);
1149 break;
1150
1151 case IP_ONESBCAST:
1152 OPTSET(INP_ONESBCAST);
1153 break;
1154 case IP_DONTFRAG:
1155 OPTSET(INP_DONTFRAG);
1156 break;
1157 case IP_BINDANY:
1158 OPTSET(INP_BINDANY);
1159 break;
1160 case IP_RECVTOS:
1161 OPTSET(INP_RECVTOS);
1162 break;
1163 case IP_BINDMULTI:
1164 OPTSET2(INP_BINDMULTI, optval);
1165 break;
1166 case IP_RECVFLOWID:
1167 OPTSET2(INP_RECVFLOWID, optval);
1168 break;
1169 #ifdef RSS
1170 case IP_RSS_LISTEN_BUCKET:
1171 if ((optval >= 0) &&
1172 (optval < rss_getnumbuckets())) {
1173 inp->inp_rss_listen_bucket = optval;
1174 OPTSET2(INP_RSS_BUCKET_SET, 1);
1175 } else {
1176 error = EINVAL;
1177 }
1178 break;
1179 case IP_RECVRSSBUCKETID:
1180 OPTSET2(INP_RECVRSSBUCKETID, optval);
1181 break;
1182 #endif
1183 }
1184 break;
1185 #undef OPTSET
1186 #undef OPTSET2
1187
1188 /*
1189 * Multicast socket options are processed by the in_mcast
1190 * module.
1191 */
1192 case IP_MULTICAST_IF:
1193 case IP_MULTICAST_VIF:
1194 case IP_MULTICAST_TTL:
1195 case IP_MULTICAST_LOOP:
1196 case IP_ADD_MEMBERSHIP:
1197 case IP_DROP_MEMBERSHIP:
1198 case IP_ADD_SOURCE_MEMBERSHIP:
1199 case IP_DROP_SOURCE_MEMBERSHIP:
1200 case IP_BLOCK_SOURCE:
1201 case IP_UNBLOCK_SOURCE:
1202 case IP_MSFILTER:
1203 case MCAST_JOIN_GROUP:
1204 case MCAST_LEAVE_GROUP:
1205 case MCAST_JOIN_SOURCE_GROUP:
1206 case MCAST_LEAVE_SOURCE_GROUP:
1207 case MCAST_BLOCK_SOURCE:
1208 case MCAST_UNBLOCK_SOURCE:
1209 error = inp_setmoptions(inp, sopt);
1210 break;
1211
1212 case IP_PORTRANGE:
1213 error = sooptcopyin(sopt, &optval, sizeof optval,
1214 sizeof optval);
1215 if (error)
1216 break;
1217
1218 INP_WLOCK(inp);
1219 switch (optval) {
1220 case IP_PORTRANGE_DEFAULT:
1221 inp->inp_flags &= ~(INP_LOWPORT);
1222 inp->inp_flags &= ~(INP_HIGHPORT);
1223 break;
1224
1225 case IP_PORTRANGE_HIGH:
1226 inp->inp_flags &= ~(INP_LOWPORT);
1227 inp->inp_flags |= INP_HIGHPORT;
1228 break;
1229
1230 case IP_PORTRANGE_LOW:
1231 inp->inp_flags &= ~(INP_HIGHPORT);
1232 inp->inp_flags |= INP_LOWPORT;
1233 break;
1234
1235 default:
1236 error = EINVAL;
1237 break;
1238 }
1239 INP_WUNLOCK(inp);
1240 break;
1241
1242 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1243 case IP_IPSEC_POLICY:
1244 if (IPSEC_ENABLED(ipv4)) {
1245 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1246 break;
1247 }
1248 /* FALLTHROUGH */
1249 #endif /* IPSEC */
1250
1251 default:
1252 error = ENOPROTOOPT;
1253 break;
1254 }
1255 break;
1256
1257 case SOPT_GET:
1258 switch (sopt->sopt_name) {
1259 case IP_OPTIONS:
1260 case IP_RETOPTS:
1261 INP_RLOCK(inp);
1262 if (inp->inp_options) {
1263 struct mbuf *options;
1264
1265 options = m_dup(inp->inp_options, M_NOWAIT);
1266 INP_RUNLOCK(inp);
1267 if (options != NULL) {
1268 error = sooptcopyout(sopt,
1269 mtod(options, char *),
1270 options->m_len);
1271 m_freem(options);
1272 } else
1273 error = ENOMEM;
1274 } else {
1275 INP_RUNLOCK(inp);
1276 sopt->sopt_valsize = 0;
1277 }
1278 break;
1279
1280 case IP_TOS:
1281 case IP_TTL:
1282 case IP_MINTTL:
1283 case IP_RECVOPTS:
1284 case IP_RECVRETOPTS:
1285 case IP_ORIGDSTADDR:
1286 case IP_RECVDSTADDR:
1287 case IP_RECVTTL:
1288 case IP_RECVIF:
1289 case IP_PORTRANGE:
1290 case IP_ONESBCAST:
1291 case IP_DONTFRAG:
1292 case IP_BINDANY:
1293 case IP_RECVTOS:
1294 case IP_BINDMULTI:
1295 case IP_FLOWID:
1296 case IP_FLOWTYPE:
1297 case IP_RECVFLOWID:
1298 #ifdef RSS
1299 case IP_RSSBUCKETID:
1300 case IP_RECVRSSBUCKETID:
1301 #endif
1302 switch (sopt->sopt_name) {
1303
1304 case IP_TOS:
1305 optval = inp->inp_ip_tos;
1306 break;
1307
1308 case IP_TTL:
1309 optval = inp->inp_ip_ttl;
1310 break;
1311
1312 case IP_MINTTL:
1313 optval = inp->inp_ip_minttl;
1314 break;
1315
1316 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
1317 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0)
1318
1319 case IP_RECVOPTS:
1320 optval = OPTBIT(INP_RECVOPTS);
1321 break;
1322
1323 case IP_RECVRETOPTS:
1324 optval = OPTBIT(INP_RECVRETOPTS);
1325 break;
1326
1327 case IP_RECVDSTADDR:
1328 optval = OPTBIT(INP_RECVDSTADDR);
1329 break;
1330
1331 case IP_ORIGDSTADDR:
1332 optval = OPTBIT2(INP_ORIGDSTADDR);
1333 break;
1334
1335 case IP_RECVTTL:
1336 optval = OPTBIT(INP_RECVTTL);
1337 break;
1338
1339 case IP_RECVIF:
1340 optval = OPTBIT(INP_RECVIF);
1341 break;
1342
1343 case IP_PORTRANGE:
1344 if (inp->inp_flags & INP_HIGHPORT)
1345 optval = IP_PORTRANGE_HIGH;
1346 else if (inp->inp_flags & INP_LOWPORT)
1347 optval = IP_PORTRANGE_LOW;
1348 else
1349 optval = 0;
1350 break;
1351
1352 case IP_ONESBCAST:
1353 optval = OPTBIT(INP_ONESBCAST);
1354 break;
1355 case IP_DONTFRAG:
1356 optval = OPTBIT(INP_DONTFRAG);
1357 break;
1358 case IP_BINDANY:
1359 optval = OPTBIT(INP_BINDANY);
1360 break;
1361 case IP_RECVTOS:
1362 optval = OPTBIT(INP_RECVTOS);
1363 break;
1364 case IP_FLOWID:
1365 optval = inp->inp_flowid;
1366 break;
1367 case IP_FLOWTYPE:
1368 optval = inp->inp_flowtype;
1369 break;
1370 case IP_RECVFLOWID:
1371 optval = OPTBIT2(INP_RECVFLOWID);
1372 break;
1373 #ifdef RSS
1374 case IP_RSSBUCKETID:
1375 retval = rss_hash2bucket(inp->inp_flowid,
1376 inp->inp_flowtype,
1377 &rss_bucket);
1378 if (retval == 0)
1379 optval = rss_bucket;
1380 else
1381 error = EINVAL;
1382 break;
1383 case IP_RECVRSSBUCKETID:
1384 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1385 break;
1386 #endif
1387 case IP_BINDMULTI:
1388 optval = OPTBIT2(INP_BINDMULTI);
1389 break;
1390 }
1391 error = sooptcopyout(sopt, &optval, sizeof optval);
1392 break;
1393
1394 /*
1395 * Multicast socket options are processed by the in_mcast
1396 * module.
1397 */
1398 case IP_MULTICAST_IF:
1399 case IP_MULTICAST_VIF:
1400 case IP_MULTICAST_TTL:
1401 case IP_MULTICAST_LOOP:
1402 case IP_MSFILTER:
1403 error = inp_getmoptions(inp, sopt);
1404 break;
1405
1406 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1407 case IP_IPSEC_POLICY:
1408 if (IPSEC_ENABLED(ipv4)) {
1409 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1410 break;
1411 }
1412 /* FALLTHROUGH */
1413 #endif /* IPSEC */
1414
1415 default:
1416 error = ENOPROTOOPT;
1417 break;
1418 }
1419 break;
1420 }
1421 return (error);
1422 }
1423
1424 /*
1425 * Routine called from ip_output() to loop back a copy of an IP multicast
1426 * packet to the input queue of a specified interface. Note that this
1427 * calls the output routine of the loopback "driver", but with an interface
1428 * pointer that might NOT be a loopback interface -- evil, but easier than
1429 * replicating that code here.
1430 */
1431 static void
1432 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1433 {
1434 struct ip *ip;
1435 struct mbuf *copym;
1436
1437 /*
1438 * Make a deep copy of the packet because we're going to
1439 * modify the pack in order to generate checksums.
1440 */
1441 copym = m_dup(m, M_NOWAIT);
1442 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1443 copym = m_pullup(copym, hlen);
1444 if (copym != NULL) {
1445 /* If needed, compute the checksum and mark it as valid. */
1446 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1447 in_delayed_cksum(copym);
1448 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1449 copym->m_pkthdr.csum_flags |=
1450 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1451 copym->m_pkthdr.csum_data = 0xffff;
1452 }
1453 /*
1454 * We don't bother to fragment if the IP length is greater
1455 * than the interface's MTU. Can this possibly matter?
1456 */
1457 ip = mtod(copym, struct ip *);
1458 ip->ip_sum = 0;
1459 ip->ip_sum = in_cksum(copym, hlen);
1460 if_simloop(ifp, copym, AF_INET, 0);
1461 }
1462 }
Cache object: edb341ea697039bd7f454ada4ea7534f
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