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cxgbe/t4_tom: Read the chip's DDP page sizes and save them in a
[freebsd-src.git] / sys / netinet / ip_output.c
blobe5f1c1ab91431921553af90f2fcdcde5aba96e4b
1 /*-
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include "opt_inet.h"
36 #include "opt_ipsec.h"
37 #include "opt_mbuf_stress_test.h"
38 #include "opt_mpath.h"
39 #include "opt_route.h"
40 #include "opt_sctp.h"
41 #include "opt_rss.h"
42
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.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/rmlock.h>
53 #include <sys/sdt.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/sysctl.h>
57 #include <sys/ucred.h>
58
59 #include <net/if.h>
60 #include <net/if_var.h>
61 #include <net/if_llatbl.h>
62 #include <net/netisr.h>
63 #include <net/pfil.h>
64 #include <net/route.h>
65 #include <net/flowtable.h>
66 #ifdef RADIX_MPATH
67 #include <net/radix_mpath.h>
68 #endif
69 #include <net/rss_config.h>
70 #include <net/vnet.h>
71
72 #include <netinet/in.h>
73 #include <netinet/in_kdtrace.h>
74 #include <netinet/in_systm.h>
75 #include <netinet/ip.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 #ifdef SCTP
82 #include <netinet/sctp.h>
83 #include <netinet/sctp_crc32.h>
84 #endif
85
86 #ifdef IPSEC
87 #include <netinet/ip_ipsec.h>
88 #include <netipsec/ipsec.h>
89 #endif /* IPSEC*/
90
91 #include <machine/in_cksum.h>
92
93 #include <security/mac/mac_framework.h>
94
95 #ifdef MBUF_STRESS_TEST
96 static int mbuf_frag_size = 0;
97 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
98 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
99 #endif
100
101 static void ip_mloopback(struct ifnet *, const struct mbuf *, int);
102
103
104 extern int in_mcast_loop;
105 extern struct protosw inetsw[];
106
107 static inline int
108 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp,
109 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 *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, inp);
122 m = *mp;
123 if ((*error) != 0 || m == NULL)
124 return 1; /* Finished */
125
126 ip = mtod(m, struct ip *);
127
128 /* See if destination IP address was changed by packet filter. */
129 if (odst.s_addr != ip->ip_dst.s_addr) {
130 m->m_flags |= M_SKIP_FIREWALL;
131 /* If destination is now ourself drop to ip_input(). */
132 if (in_localip(ip->ip_dst)) {
133 m->m_flags |= M_FASTFWD_OURS;
134 if (m->m_pkthdr.rcvif == NULL)
135 m->m_pkthdr.rcvif = V_loif;
136 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
137 m->m_pkthdr.csum_flags |=
138 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
139 m->m_pkthdr.csum_data = 0xffff;
140 }
141 m->m_pkthdr.csum_flags |=
142 CSUM_IP_CHECKED | CSUM_IP_VALID;
143 #ifdef SCTP
144 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
145 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
146 #endif
147 *error = netisr_queue(NETISR_IP, m);
148 return 1; /* Finished */
149 }
150
151 bzero(dst, sizeof(*dst));
152 dst->sin_family = AF_INET;
153 dst->sin_len = sizeof(*dst);
154 dst->sin_addr = ip->ip_dst;
155
156 return -1; /* Reloop */
157 }
158 /* See if fib was changed by packet filter. */
159 if ((*fibnum) != M_GETFIB(m)) {
160 m->m_flags |= M_SKIP_FIREWALL;
161 *fibnum = M_GETFIB(m);
162 return -1; /* Reloop for FIB change */
163 }
164
165 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
166 if (m->m_flags & M_FASTFWD_OURS) {
167 if (m->m_pkthdr.rcvif == NULL)
168 m->m_pkthdr.rcvif = V_loif;
169 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
170 m->m_pkthdr.csum_flags |=
171 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
172 m->m_pkthdr.csum_data = 0xffff;
173 }
174 #ifdef SCTP
175 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
176 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
177 #endif
178 m->m_pkthdr.csum_flags |=
179 CSUM_IP_CHECKED | CSUM_IP_VALID;
180
181 *error = netisr_queue(NETISR_IP, m);
182 return 1; /* Finished */
183 }
184 /* Or forward to some other address? */
185 if ((m->m_flags & M_IP_NEXTHOP) &&
186 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
187 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
188 m->m_flags |= M_SKIP_FIREWALL;
189 m->m_flags &= ~M_IP_NEXTHOP;
190 m_tag_delete(m, fwd_tag);
191
192 return -1; /* Reloop for CHANGE of dst */
193 }
194
195 return 0;
196 }
197
198 /*
199 * IP output. The packet in mbuf chain m contains a skeletal IP
200 * header (with len, off, ttl, proto, tos, src, dst).
201 * The mbuf chain containing the packet will be freed.
202 * The mbuf opt, if present, will not be freed.
203 * If route ro is present and has ro_rt initialized, route lookup would be
204 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
205 * then result of route lookup is stored in ro->ro_rt.
206 *
207 * In the IP forwarding case, the packet will arrive with options already
208 * inserted, so must have a NULL opt pointer.
209 */
210 int
211 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
212 struct ip_moptions *imo, struct inpcb *inp)
213 {
214 struct rm_priotracker in_ifa_tracker;
215 struct ip *ip;
216 struct ifnet *ifp = NULL; /* keep compiler happy */
217 struct mbuf *m0;
218 int hlen = sizeof (struct ip);
219 int mtu;
220 int error = 0;
221 struct sockaddr_in *dst;
222 const struct sockaddr_in *gw;
223 struct in_ifaddr *ia;
224 int isbroadcast;
225 uint16_t ip_len, ip_off;
226 struct route iproute;
227 struct rtentry *rte; /* cache for ro->ro_rt */
228 uint32_t fibnum;
229 int have_ia_ref;
230 #ifdef IPSEC
231 int no_route_but_check_spd = 0;
232 #endif
233 M_ASSERTPKTHDR(m);
234
235 if (inp != NULL) {
236 INP_LOCK_ASSERT(inp);
237 M_SETFIB(m, inp->inp_inc.inc_fibnum);
238 if ((flags & IP_NODEFAULTFLOWID) == 0) {
239 m->m_pkthdr.flowid = inp->inp_flowid;
240 M_HASHTYPE_SET(m, inp->inp_flowtype);
241 }
242 }
243
244 if (ro == NULL) {
245 ro = &iproute;
246 bzero(ro, sizeof (*ro));
247 } else
248 ro->ro_flags |= RT_LLE_CACHE;
249
250 #ifdef FLOWTABLE
251 if (ro->ro_rt == NULL)
252 (void )flowtable_lookup(AF_INET, m, ro);
253 #endif
254
255 if (opt) {
256 int len = 0;
257 m = ip_insertoptions(m, opt, &len);
258 if (len != 0)
259 hlen = len; /* ip->ip_hl is updated above */
260 }
261 ip = mtod(m, struct ip *);
262 ip_len = ntohs(ip->ip_len);
263 ip_off = ntohs(ip->ip_off);
264
265 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
266 ip->ip_v = IPVERSION;
267 ip->ip_hl = hlen >> 2;
268 ip_fillid(ip);
269 IPSTAT_INC(ips_localout);
270 } else {
271 /* Header already set, fetch hlen from there */
272 hlen = ip->ip_hl << 2;
273 }
274
275 /*
276 * dst/gw handling:
277 *
278 * dst can be rewritten but always points to &ro->ro_dst.
279 * gw is readonly but can point either to dst OR rt_gateway,
280 * therefore we need restore gw if we're redoing lookup.
281 */
282 gw = dst = (struct sockaddr_in *)&ro->ro_dst;
283 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
284 rte = ro->ro_rt;
285 if (rte == NULL) {
286 bzero(dst, sizeof(*dst));
287 dst->sin_family = AF_INET;
288 dst->sin_len = sizeof(*dst);
289 dst->sin_addr = ip->ip_dst;
290 }
291 again:
292 /*
293 * Validate route against routing table additions;
294 * a better/more specific route might have been added.
295 */
296 if (inp)
297 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
298 /*
299 * If there is a cached route,
300 * check that it is to the same destination
301 * and is still up. If not, free it and try again.
302 * The address family should also be checked in case of sharing the
303 * cache with IPv6.
304 * Also check whether routing cache needs invalidation.
305 */
306 rte = ro->ro_rt;
307 if (rte && ((rte->rt_flags & RTF_UP) == 0 ||
308 rte->rt_ifp == NULL ||
309 !RT_LINK_IS_UP(rte->rt_ifp) ||
310 dst->sin_family != AF_INET ||
311 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
312 RTFREE(rte);
313 rte = ro->ro_rt = (struct rtentry *)NULL;
314 if (ro->ro_lle)
315 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
316 ro->ro_lle = (struct llentry *)NULL;
317 }
318 ia = NULL;
319 have_ia_ref = 0;
320 /*
321 * If routing to interface only, short circuit routing lookup.
322 * The use of an all-ones broadcast address implies this; an
323 * interface is specified by the broadcast address of an interface,
324 * or the destination address of a ptp interface.
325 */
326 if (flags & IP_SENDONES) {
327 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
328 M_GETFIB(m)))) == NULL &&
329 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
330 M_GETFIB(m)))) == NULL) {
331 IPSTAT_INC(ips_noroute);
332 error = ENETUNREACH;
333 goto bad;
334 }
335 have_ia_ref = 1;
336 ip->ip_dst.s_addr = INADDR_BROADCAST;
337 dst->sin_addr = ip->ip_dst;
338 ifp = ia->ia_ifp;
339 ip->ip_ttl = 1;
340 isbroadcast = 1;
341 } else if (flags & IP_ROUTETOIF) {
342 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
343 M_GETFIB(m)))) == NULL &&
344 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
345 M_GETFIB(m)))) == NULL) {
346 IPSTAT_INC(ips_noroute);
347 error = ENETUNREACH;
348 goto bad;
349 }
350 have_ia_ref = 1;
351 ifp = ia->ia_ifp;
352 ip->ip_ttl = 1;
353 isbroadcast = in_broadcast(dst->sin_addr, ifp);
354 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
355 imo != NULL && imo->imo_multicast_ifp != NULL) {
356 /*
357 * Bypass the normal routing lookup for multicast
358 * packets if the interface is specified.
359 */
360 ifp = imo->imo_multicast_ifp;
361 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
362 if (ia)
363 have_ia_ref = 1;
364 isbroadcast = 0; /* fool gcc */
365 } else {
366 /*
367 * We want to do any cloning requested by the link layer,
368 * as this is probably required in all cases for correct
369 * operation (as it is for ARP).
370 */
371 if (rte == NULL) {
372 #ifdef RADIX_MPATH
373 rtalloc_mpath_fib(ro,
374 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
375 fibnum);
376 #else
377 in_rtalloc_ign(ro, 0, fibnum);
378 #endif
379 rte = ro->ro_rt;
380 }
381 if (rte == NULL ||
382 (rte->rt_flags & RTF_UP) == 0 ||
383 rte->rt_ifp == NULL ||
384 !RT_LINK_IS_UP(rte->rt_ifp)) {
385 #ifdef IPSEC
386 /*
387 * There is no route for this packet, but it is
388 * possible that a matching SPD entry exists.
389 */
390 no_route_but_check_spd = 1;
391 mtu = 0; /* Silence GCC warning. */
392 goto sendit;
393 #endif
394 IPSTAT_INC(ips_noroute);
395 error = EHOSTUNREACH;
396 goto bad;
397 }
398 ia = ifatoia(rte->rt_ifa);
399 ifp = rte->rt_ifp;
400 counter_u64_add(rte->rt_pksent, 1);
401 rt_update_ro_flags(ro);
402 if (rte->rt_flags & RTF_GATEWAY)
403 gw = (struct sockaddr_in *)rte->rt_gateway;
404 if (rte->rt_flags & RTF_HOST)
405 isbroadcast = (rte->rt_flags & RTF_BROADCAST);
406 else
407 isbroadcast = in_broadcast(gw->sin_addr, ifp);
408 }
409
410 /*
411 * Calculate MTU. If we have a route that is up, use that,
412 * otherwise use the interface's MTU.
413 */
414 if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
415 mtu = rte->rt_mtu;
416 else
417 mtu = ifp->if_mtu;
418 /* Catch a possible divide by zero later. */
419 KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
420 __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
421
422 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
423 m->m_flags |= M_MCAST;
424 /*
425 * IP destination address is multicast. Make sure "gw"
426 * still points to the address in "ro". (It may have been
427 * changed to point to a gateway address, above.)
428 */
429 gw = dst;
430 /*
431 * See if the caller provided any multicast options
432 */
433 if (imo != NULL) {
434 ip->ip_ttl = imo->imo_multicast_ttl;
435 if (imo->imo_multicast_vif != -1)
436 ip->ip_src.s_addr =
437 ip_mcast_src ?
438 ip_mcast_src(imo->imo_multicast_vif) :
439 INADDR_ANY;
440 } else
441 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
442 /*
443 * Confirm that the outgoing interface supports multicast.
444 */
445 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
446 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
447 IPSTAT_INC(ips_noroute);
448 error = ENETUNREACH;
449 goto bad;
450 }
451 }
452 /*
453 * If source address not specified yet, use address
454 * of outgoing interface.
455 */
456 if (ip->ip_src.s_addr == INADDR_ANY) {
457 /* Interface may have no addresses. */
458 if (ia != NULL)
459 ip->ip_src = IA_SIN(ia)->sin_addr;
460 }
461
462 if ((imo == NULL && in_mcast_loop) ||
463 (imo && imo->imo_multicast_loop)) {
464 /*
465 * Loop back multicast datagram if not expressly
466 * forbidden to do so, even if we are not a member
467 * of the group; ip_input() will filter it later,
468 * thus deferring a hash lookup and mutex acquisition
469 * at the expense of a cheap copy using m_copym().
470 */
471 ip_mloopback(ifp, m, hlen);
472 } else {
473 /*
474 * If we are acting as a multicast router, perform
475 * multicast forwarding as if the packet had just
476 * arrived on the interface to which we are about
477 * to send. The multicast forwarding function
478 * recursively calls this function, using the
479 * IP_FORWARDING flag to prevent infinite recursion.
480 *
481 * Multicasts that are looped back by ip_mloopback(),
482 * above, will be forwarded by the ip_input() routine,
483 * if necessary.
484 */
485 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
486 /*
487 * If rsvp daemon is not running, do not
488 * set ip_moptions. This ensures that the packet
489 * is multicast and not just sent down one link
490 * as prescribed by rsvpd.
491 */
492 if (!V_rsvp_on)
493 imo = NULL;
494 if (ip_mforward &&
495 ip_mforward(ip, ifp, m, imo) != 0) {
496 m_freem(m);
497 goto done;
498 }
499 }
500 }
501
502 /*
503 * Multicasts with a time-to-live of zero may be looped-
504 * back, above, but must not be transmitted on a network.
505 * Also, multicasts addressed to the loopback interface
506 * are not sent -- the above call to ip_mloopback() will
507 * loop back a copy. ip_input() will drop the copy if
508 * this host does not belong to the destination group on
509 * the loopback interface.
510 */
511 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
512 m_freem(m);
513 goto done;
514 }
515
516 goto sendit;
517 }
518
519 /*
520 * If the source address is not specified yet, use the address
521 * of the outoing interface.
522 */
523 if (ip->ip_src.s_addr == INADDR_ANY) {
524 /* Interface may have no addresses. */
525 if (ia != NULL) {
526 ip->ip_src = IA_SIN(ia)->sin_addr;
527 }
528 }
529
530 /*
531 * Look for broadcast address and
532 * verify user is allowed to send
533 * such a packet.
534 */
535 if (isbroadcast) {
536 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
537 error = EADDRNOTAVAIL;
538 goto bad;
539 }
540 if ((flags & IP_ALLOWBROADCAST) == 0) {
541 error = EACCES;
542 goto bad;
543 }
544 /* don't allow broadcast messages to be fragmented */
545 if (ip_len > mtu) {
546 error = EMSGSIZE;
547 goto bad;
548 }
549 m->m_flags |= M_BCAST;
550 } else {
551 m->m_flags &= ~M_BCAST;
552 }
553
554 sendit:
555 #ifdef IPSEC
556 switch(ip_ipsec_output(&m, inp, &error)) {
557 case 1:
558 goto bad;
559 case -1:
560 goto done;
561 case 0:
562 default:
563 break; /* Continue with packet processing. */
564 }
565 /*
566 * Check if there was a route for this packet; return error if not.
567 */
568 if (no_route_but_check_spd) {
569 IPSTAT_INC(ips_noroute);
570 error = EHOSTUNREACH;
571 goto bad;
572 }
573 /* Update variables that are affected by ipsec4_output(). */
574 ip = mtod(m, struct ip *);
575 hlen = ip->ip_hl << 2;
576 #endif /* IPSEC */
577
578 /* Jump over all PFIL processing if hooks are not active. */
579 if (PFIL_HOOKED(&V_inet_pfil_hook)) {
580 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
581 case 1: /* Finished */
582 goto done;
583
584 case 0: /* Continue normally */
585 ip = mtod(m, struct ip *);
586 break;
587
588 case -1: /* Need to try again */
589 /* Reset everything for a new round */
590 RO_RTFREE(ro);
591 if (have_ia_ref)
592 ifa_free(&ia->ia_ifa);
593 ro->ro_prepend = NULL;
594 rte = NULL;
595 gw = dst;
596 ip = mtod(m, struct ip *);
597 goto again;
598
599 }
600 }
601
602 /* 127/8 must not appear on wire - RFC1122. */
603 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
604 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
605 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
606 IPSTAT_INC(ips_badaddr);
607 error = EADDRNOTAVAIL;
608 goto bad;
609 }
610 }
611
612 m->m_pkthdr.csum_flags |= CSUM_IP;
613 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
614 in_delayed_cksum(m);
615 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
616 }
617 #ifdef SCTP
618 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
619 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
620 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
621 }
622 #endif
623
624 /*
625 * If small enough for interface, or the interface will take
626 * care of the fragmentation for us, we can just send directly.
627 */
628 if (ip_len <= mtu ||
629 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
630 ip->ip_sum = 0;
631 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
632 ip->ip_sum = in_cksum(m, hlen);
633 m->m_pkthdr.csum_flags &= ~CSUM_IP;
634 }
635
636 /*
637 * Record statistics for this interface address.
638 * With CSUM_TSO the byte/packet count will be slightly
639 * incorrect because we count the IP+TCP headers only
640 * once instead of for every generated packet.
641 */
642 if (!(flags & IP_FORWARDING) && ia) {
643 if (m->m_pkthdr.csum_flags & CSUM_TSO)
644 counter_u64_add(ia->ia_ifa.ifa_opackets,
645 m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
646 else
647 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
648
649 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
650 }
651 #ifdef MBUF_STRESS_TEST
652 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
653 m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
654 #endif
655 /*
656 * Reset layer specific mbuf flags
657 * to avoid confusing lower layers.
658 */
659 m_clrprotoflags(m);
660 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
661 error = (*ifp->if_output)(ifp, m,
662 (const struct sockaddr *)gw, ro);
663 goto done;
664 }
665
666 /* Balk when DF bit is set or the interface didn't support TSO. */
667 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
668 error = EMSGSIZE;
669 IPSTAT_INC(ips_cantfrag);
670 goto bad;
671 }
672
673 /*
674 * Too large for interface; fragment if possible. If successful,
675 * on return, m will point to a list of packets to be sent.
676 */
677 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
678 if (error)
679 goto bad;
680 for (; m; m = m0) {
681 m0 = m->m_nextpkt;
682 m->m_nextpkt = 0;
683 if (error == 0) {
684 /* Record statistics for this interface address. */
685 if (ia != NULL) {
686 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
687 counter_u64_add(ia->ia_ifa.ifa_obytes,
688 m->m_pkthdr.len);
689 }
690 /*
691 * Reset layer specific mbuf flags
692 * to avoid confusing upper layers.
693 */
694 m_clrprotoflags(m);
695
696 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
697 error = (*ifp->if_output)(ifp, m,
698 (const struct sockaddr *)gw, ro);
699 } else
700 m_freem(m);
701 }
702
703 if (error == 0)
704 IPSTAT_INC(ips_fragmented);
705
706 done:
707 /*
708 * Release the route if using our private route, or if
709 * (with flowtable) we don't have our own reference.
710 */
711 if (ro == &iproute || ro->ro_flags & RT_NORTREF)
712 RO_RTFREE(ro);
713 else if (rte == NULL)
714 /*
715 * If the caller supplied a route but somehow the reference
716 * to it has been released need to prevent the caller
717 * calling RTFREE on it again.
718 */
719 ro->ro_rt = NULL;
720 if (have_ia_ref)
721 ifa_free(&ia->ia_ifa);
722 return (error);
723 bad:
724 m_freem(m);
725 goto done;
726 }
727
728 /*
729 * Create a chain of fragments which fit the given mtu. m_frag points to the
730 * mbuf to be fragmented; on return it points to the chain with the fragments.
731 * Return 0 if no error. If error, m_frag may contain a partially built
732 * chain of fragments that should be freed by the caller.
733 *
734 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
735 */
736 int
737 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
738 u_long if_hwassist_flags)
739 {
740 int error = 0;
741 int hlen = ip->ip_hl << 2;
742 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
743 int off;
744 struct mbuf *m0 = *m_frag; /* the original packet */
745 int firstlen;
746 struct mbuf **mnext;
747 int nfrags;
748 uint16_t ip_len, ip_off;
749
750 ip_len = ntohs(ip->ip_len);
751 ip_off = ntohs(ip->ip_off);
752
753 if (ip_off & IP_DF) { /* Fragmentation not allowed */
754 IPSTAT_INC(ips_cantfrag);
755 return EMSGSIZE;
756 }
757
758 /*
759 * Must be able to put at least 8 bytes per fragment.
760 */
761 if (len < 8)
762 return EMSGSIZE;
763
764 /*
765 * If the interface will not calculate checksums on
766 * fragmented packets, then do it here.
767 */
768 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
769 in_delayed_cksum(m0);
770 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
771 }
772 #ifdef SCTP
773 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
774 sctp_delayed_cksum(m0, hlen);
775 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
776 }
777 #endif
778 if (len > PAGE_SIZE) {
779 /*
780 * Fragment large datagrams such that each segment
781 * contains a multiple of PAGE_SIZE amount of data,
782 * plus headers. This enables a receiver to perform
783 * page-flipping zero-copy optimizations.
784 *
785 * XXX When does this help given that sender and receiver
786 * could have different page sizes, and also mtu could
787 * be less than the receiver's page size ?
788 */
789 int newlen;
790
791 off = MIN(mtu, m0->m_pkthdr.len);
792
793 /*
794 * firstlen (off - hlen) must be aligned on an
795 * 8-byte boundary
796 */
797 if (off < hlen)
798 goto smart_frag_failure;
799 off = ((off - hlen) & ~7) + hlen;
800 newlen = (~PAGE_MASK) & mtu;
801 if ((newlen + sizeof (struct ip)) > mtu) {
802 /* we failed, go back the default */
803 smart_frag_failure:
804 newlen = len;
805 off = hlen + len;
806 }
807 len = newlen;
808
809 } else {
810 off = hlen + len;
811 }
812
813 firstlen = off - hlen;
814 mnext = &m0->m_nextpkt; /* pointer to next packet */
815
816 /*
817 * Loop through length of segment after first fragment,
818 * make new header and copy data of each part and link onto chain.
819 * Here, m0 is the original packet, m is the fragment being created.
820 * The fragments are linked off the m_nextpkt of the original
821 * packet, which after processing serves as the first fragment.
822 */
823 for (nfrags = 1; off < ip_len; off += len, nfrags++) {
824 struct ip *mhip; /* ip header on the fragment */
825 struct mbuf *m;
826 int mhlen = sizeof (struct ip);
827
828 m = m_gethdr(M_NOWAIT, MT_DATA);
829 if (m == NULL) {
830 error = ENOBUFS;
831 IPSTAT_INC(ips_odropped);
832 goto done;
833 }
834 /*
835 * Make sure the complete packet header gets copied
836 * from the originating mbuf to the newly created
837 * mbuf. This also ensures that existing firewall
838 * classification(s), VLAN tags and so on get copied
839 * to the resulting fragmented packet(s):
840 */
841 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
842 m_free(m);
843 error = ENOBUFS;
844 IPSTAT_INC(ips_odropped);
845 goto done;
846 }
847 /*
848 * In the first mbuf, leave room for the link header, then
849 * copy the original IP header including options. The payload
850 * goes into an additional mbuf chain returned by m_copym().
851 */
852 m->m_data += max_linkhdr;
853 mhip = mtod(m, struct ip *);
854 *mhip = *ip;
855 if (hlen > sizeof (struct ip)) {
856 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
857 mhip->ip_v = IPVERSION;
858 mhip->ip_hl = mhlen >> 2;
859 }
860 m->m_len = mhlen;
861 /* XXX do we need to add ip_off below ? */
862 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
863 if (off + len >= ip_len)
864 len = ip_len - off;
865 else
866 mhip->ip_off |= IP_MF;
867 mhip->ip_len = htons((u_short)(len + mhlen));
868 m->m_next = m_copym(m0, off, len, M_NOWAIT);
869 if (m->m_next == NULL) { /* copy failed */
870 m_free(m);
871 error = ENOBUFS; /* ??? */
872 IPSTAT_INC(ips_odropped);
873 goto done;
874 }
875 m->m_pkthdr.len = mhlen + len;
876 #ifdef MAC
877 mac_netinet_fragment(m0, m);
878 #endif
879 mhip->ip_off = htons(mhip->ip_off);
880 mhip->ip_sum = 0;
881 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
882 mhip->ip_sum = in_cksum(m, mhlen);
883 m->m_pkthdr.csum_flags &= ~CSUM_IP;
884 }
885 *mnext = m;
886 mnext = &m->m_nextpkt;
887 }
888 IPSTAT_ADD(ips_ofragments, nfrags);
889
890 /*
891 * Update first fragment by trimming what's been copied out
892 * and updating header.
893 */
894 m_adj(m0, hlen + firstlen - ip_len);
895 m0->m_pkthdr.len = hlen + firstlen;
896 ip->ip_len = htons((u_short)m0->m_pkthdr.len);
897 ip->ip_off = htons(ip_off | IP_MF);
898 ip->ip_sum = 0;
899 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
900 ip->ip_sum = in_cksum(m0, hlen);
901 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
902 }
903
904 done:
905 *m_frag = m0;
906 return error;
907 }
908
909 void
910 in_delayed_cksum(struct mbuf *m)
911 {
912 struct ip *ip;
913 uint16_t csum, offset, ip_len;
914
915 ip = mtod(m, struct ip *);
916 offset = ip->ip_hl << 2 ;
917 ip_len = ntohs(ip->ip_len);
918 csum = in_cksum_skip(m, ip_len, offset);
919 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
920 csum = 0xffff;
921 offset += m->m_pkthdr.csum_data; /* checksum offset */
922
923 /* find the mbuf in the chain where the checksum starts*/
924 while ((m != NULL) && (offset >= m->m_len)) {
925 offset -= m->m_len;
926 m = m->m_next;
927 }
928 KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain."));
929 KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs."));
930 *(u_short *)(m->m_data + offset) = csum;
931 }
932
933 /*
934 * IP socket option processing.
935 */
936 int
937 ip_ctloutput(struct socket *so, struct sockopt *sopt)
938 {
939 struct inpcb *inp = sotoinpcb(so);
940 int error, optval;
941 #ifdef RSS
942 uint32_t rss_bucket;
943 int retval;
944 #endif
945
946 error = optval = 0;
947 if (sopt->sopt_level != IPPROTO_IP) {
948 error = EINVAL;
949
950 if (sopt->sopt_level == SOL_SOCKET &&
951 sopt->sopt_dir == SOPT_SET) {
952 switch (sopt->sopt_name) {
953 case SO_REUSEADDR:
954 INP_WLOCK(inp);
955 if ((so->so_options & SO_REUSEADDR) != 0)
956 inp->inp_flags2 |= INP_REUSEADDR;
957 else
958 inp->inp_flags2 &= ~INP_REUSEADDR;
959 INP_WUNLOCK(inp);
960 error = 0;
961 break;
962 case SO_REUSEPORT:
963 INP_WLOCK(inp);
964 if ((so->so_options & SO_REUSEPORT) != 0)
965 inp->inp_flags2 |= INP_REUSEPORT;
966 else
967 inp->inp_flags2 &= ~INP_REUSEPORT;
968 INP_WUNLOCK(inp);
969 error = 0;
970 break;
971 case SO_SETFIB:
972 INP_WLOCK(inp);
973 inp->inp_inc.inc_fibnum = so->so_fibnum;
974 INP_WUNLOCK(inp);
975 error = 0;
976 break;
977 default:
978 break;
979 }
980 }
981 return (error);
982 }
983
984 switch (sopt->sopt_dir) {
985 case SOPT_SET:
986 switch (sopt->sopt_name) {
987 case IP_OPTIONS:
988 #ifdef notyet
989 case IP_RETOPTS:
990 #endif
991 {
992 struct mbuf *m;
993 if (sopt->sopt_valsize > MLEN) {
994 error = EMSGSIZE;
995 break;
996 }
997 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
998 if (m == NULL) {
999 error = ENOBUFS;
1000 break;
1001 }
1002 m->m_len = sopt->sopt_valsize;
1003 error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1004 m->m_len);
1005 if (error) {
1006 m_free(m);
1007 break;
1008 }
1009 INP_WLOCK(inp);
1010 error = ip_pcbopts(inp, sopt->sopt_name, m);
1011 INP_WUNLOCK(inp);
1012 return (error);
1013 }
1014
1015 case IP_BINDANY:
1016 if (sopt->sopt_td != NULL) {
1017 error = priv_check(sopt->sopt_td,
1018 PRIV_NETINET_BINDANY);
1019 if (error)
1020 break;
1021 }
1022 /* FALLTHROUGH */
1023 case IP_BINDMULTI:
1024 #ifdef RSS
1025 case IP_RSS_LISTEN_BUCKET:
1026 #endif
1027 case IP_TOS:
1028 case IP_TTL:
1029 case IP_MINTTL:
1030 case IP_RECVOPTS:
1031 case IP_RECVRETOPTS:
1032 case IP_RECVDSTADDR:
1033 case IP_RECVTTL:
1034 case IP_RECVIF:
1035 case IP_ONESBCAST:
1036 case IP_DONTFRAG:
1037 case IP_RECVTOS:
1038 case IP_RECVFLOWID:
1039 #ifdef RSS
1040 case IP_RECVRSSBUCKETID:
1041 #endif
1042 error = sooptcopyin(sopt, &optval, sizeof optval,
1043 sizeof optval);
1044 if (error)
1045 break;
1046
1047 switch (sopt->sopt_name) {
1048 case IP_TOS:
1049 inp->inp_ip_tos = optval;
1050 break;
1051
1052 case IP_TTL:
1053 inp->inp_ip_ttl = optval;
1054 break;
1055
1056 case IP_MINTTL:
1057 if (optval >= 0 && optval <= MAXTTL)
1058 inp->inp_ip_minttl = optval;
1059 else
1060 error = EINVAL;
1061 break;
1062
1063 #define OPTSET(bit) do { \
1064 INP_WLOCK(inp); \
1065 if (optval) \
1066 inp->inp_flags |= bit; \
1067 else \
1068 inp->inp_flags &= ~bit; \
1069 INP_WUNLOCK(inp); \
1070 } while (0)
1071
1072 #define OPTSET2(bit, val) do { \
1073 INP_WLOCK(inp); \
1074 if (val) \
1075 inp->inp_flags2 |= bit; \
1076 else \
1077 inp->inp_flags2 &= ~bit; \
1078 INP_WUNLOCK(inp); \
1079 } while (0)
1080
1081 case IP_RECVOPTS:
1082 OPTSET(INP_RECVOPTS);
1083 break;
1084
1085 case IP_RECVRETOPTS:
1086 OPTSET(INP_RECVRETOPTS);
1087 break;
1088
1089 case IP_RECVDSTADDR:
1090 OPTSET(INP_RECVDSTADDR);
1091 break;
1092
1093 case IP_RECVTTL:
1094 OPTSET(INP_RECVTTL);
1095 break;
1096
1097 case IP_RECVIF:
1098 OPTSET(INP_RECVIF);
1099 break;
1100
1101 case IP_ONESBCAST:
1102 OPTSET(INP_ONESBCAST);
1103 break;
1104 case IP_DONTFRAG:
1105 OPTSET(INP_DONTFRAG);
1106 break;
1107 case IP_BINDANY:
1108 OPTSET(INP_BINDANY);
1109 break;
1110 case IP_RECVTOS:
1111 OPTSET(INP_RECVTOS);
1112 break;
1113 case IP_BINDMULTI:
1114 OPTSET2(INP_BINDMULTI, optval);
1115 break;
1116 case IP_RECVFLOWID:
1117 OPTSET2(INP_RECVFLOWID, optval);
1118 break;
1119 #ifdef RSS
1120 case IP_RSS_LISTEN_BUCKET:
1121 if ((optval >= 0) &&
1122 (optval < rss_getnumbuckets())) {
1123 inp->inp_rss_listen_bucket = optval;
1124 OPTSET2(INP_RSS_BUCKET_SET, 1);
1125 } else {
1126 error = EINVAL;
1127 }
1128 break;
1129 case IP_RECVRSSBUCKETID:
1130 OPTSET2(INP_RECVRSSBUCKETID, optval);
1131 break;
1132 #endif
1133 }
1134 break;
1135 #undef OPTSET
1136 #undef OPTSET2
1137
1138 /*
1139 * Multicast socket options are processed by the in_mcast
1140 * module.
1141 */
1142 case IP_MULTICAST_IF:
1143 case IP_MULTICAST_VIF:
1144 case IP_MULTICAST_TTL:
1145 case IP_MULTICAST_LOOP:
1146 case IP_ADD_MEMBERSHIP:
1147 case IP_DROP_MEMBERSHIP:
1148 case IP_ADD_SOURCE_MEMBERSHIP:
1149 case IP_DROP_SOURCE_MEMBERSHIP:
1150 case IP_BLOCK_SOURCE:
1151 case IP_UNBLOCK_SOURCE:
1152 case IP_MSFILTER:
1153 case MCAST_JOIN_GROUP:
1154 case MCAST_LEAVE_GROUP:
1155 case MCAST_JOIN_SOURCE_GROUP:
1156 case MCAST_LEAVE_SOURCE_GROUP:
1157 case MCAST_BLOCK_SOURCE:
1158 case MCAST_UNBLOCK_SOURCE:
1159 error = inp_setmoptions(inp, sopt);
1160 break;
1161
1162 case IP_PORTRANGE:
1163 error = sooptcopyin(sopt, &optval, sizeof optval,
1164 sizeof optval);
1165 if (error)
1166 break;
1167
1168 INP_WLOCK(inp);
1169 switch (optval) {
1170 case IP_PORTRANGE_DEFAULT:
1171 inp->inp_flags &= ~(INP_LOWPORT);
1172 inp->inp_flags &= ~(INP_HIGHPORT);
1173 break;
1174
1175 case IP_PORTRANGE_HIGH:
1176 inp->inp_flags &= ~(INP_LOWPORT);
1177 inp->inp_flags |= INP_HIGHPORT;
1178 break;
1179
1180 case IP_PORTRANGE_LOW:
1181 inp->inp_flags &= ~(INP_HIGHPORT);
1182 inp->inp_flags |= INP_LOWPORT;
1183 break;
1184
1185 default:
1186 error = EINVAL;
1187 break;
1188 }
1189 INP_WUNLOCK(inp);
1190 break;
1191
1192 #ifdef IPSEC
1193 case IP_IPSEC_POLICY:
1194 {
1195 caddr_t req;
1196 struct mbuf *m;
1197
1198 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1199 break;
1200 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1201 break;
1202 req = mtod(m, caddr_t);
1203 error = ipsec_set_policy(inp, sopt->sopt_name, req,
1204 m->m_len, (sopt->sopt_td != NULL) ?
1205 sopt->sopt_td->td_ucred : NULL);
1206 m_freem(m);
1207 break;
1208 }
1209 #endif /* IPSEC */
1210
1211 default:
1212 error = ENOPROTOOPT;
1213 break;
1214 }
1215 break;
1216
1217 case SOPT_GET:
1218 switch (sopt->sopt_name) {
1219 case IP_OPTIONS:
1220 case IP_RETOPTS:
1221 if (inp->inp_options)
1222 error = sooptcopyout(sopt,
1223 mtod(inp->inp_options,
1224 char *),
1225 inp->inp_options->m_len);
1226 else
1227 sopt->sopt_valsize = 0;
1228 break;
1229
1230 case IP_TOS:
1231 case IP_TTL:
1232 case IP_MINTTL:
1233 case IP_RECVOPTS:
1234 case IP_RECVRETOPTS:
1235 case IP_RECVDSTADDR:
1236 case IP_RECVTTL:
1237 case IP_RECVIF:
1238 case IP_PORTRANGE:
1239 case IP_ONESBCAST:
1240 case IP_DONTFRAG:
1241 case IP_BINDANY:
1242 case IP_RECVTOS:
1243 case IP_BINDMULTI:
1244 case IP_FLOWID:
1245 case IP_FLOWTYPE:
1246 case IP_RECVFLOWID:
1247 #ifdef RSS
1248 case IP_RSSBUCKETID:
1249 case IP_RECVRSSBUCKETID:
1250 #endif
1251 switch (sopt->sopt_name) {
1252
1253 case IP_TOS:
1254 optval = inp->inp_ip_tos;
1255 break;
1256
1257 case IP_TTL:
1258 optval = inp->inp_ip_ttl;
1259 break;
1260
1261 case IP_MINTTL:
1262 optval = inp->inp_ip_minttl;
1263 break;
1264
1265 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
1266 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0)
1267
1268 case IP_RECVOPTS:
1269 optval = OPTBIT(INP_RECVOPTS);
1270 break;
1271
1272 case IP_RECVRETOPTS:
1273 optval = OPTBIT(INP_RECVRETOPTS);
1274 break;
1275
1276 case IP_RECVDSTADDR:
1277 optval = OPTBIT(INP_RECVDSTADDR);
1278 break;
1279
1280 case IP_RECVTTL:
1281 optval = OPTBIT(INP_RECVTTL);
1282 break;
1283
1284 case IP_RECVIF:
1285 optval = OPTBIT(INP_RECVIF);
1286 break;
1287
1288 case IP_PORTRANGE:
1289 if (inp->inp_flags & INP_HIGHPORT)
1290 optval = IP_PORTRANGE_HIGH;
1291 else if (inp->inp_flags & INP_LOWPORT)
1292 optval = IP_PORTRANGE_LOW;
1293 else
1294 optval = 0;
1295 break;
1296
1297 case IP_ONESBCAST:
1298 optval = OPTBIT(INP_ONESBCAST);
1299 break;
1300 case IP_DONTFRAG:
1301 optval = OPTBIT(INP_DONTFRAG);
1302 break;
1303 case IP_BINDANY:
1304 optval = OPTBIT(INP_BINDANY);
1305 break;
1306 case IP_RECVTOS:
1307 optval = OPTBIT(INP_RECVTOS);
1308 break;
1309 case IP_FLOWID:
1310 optval = inp->inp_flowid;
1311 break;
1312 case IP_FLOWTYPE:
1313 optval = inp->inp_flowtype;
1314 break;
1315 case IP_RECVFLOWID:
1316 optval = OPTBIT2(INP_RECVFLOWID);
1317 break;
1318 #ifdef RSS
1319 case IP_RSSBUCKETID:
1320 retval = rss_hash2bucket(inp->inp_flowid,
1321 inp->inp_flowtype,
1322 &rss_bucket);
1323 if (retval == 0)
1324 optval = rss_bucket;
1325 else
1326 error = EINVAL;
1327 break;
1328 case IP_RECVRSSBUCKETID:
1329 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1330 break;
1331 #endif
1332 case IP_BINDMULTI:
1333 optval = OPTBIT2(INP_BINDMULTI);
1334 break;
1335 }
1336 error = sooptcopyout(sopt, &optval, sizeof optval);
1337 break;
1338
1339 /*
1340 * Multicast socket options are processed by the in_mcast
1341 * module.
1342 */
1343 case IP_MULTICAST_IF:
1344 case IP_MULTICAST_VIF:
1345 case IP_MULTICAST_TTL:
1346 case IP_MULTICAST_LOOP:
1347 case IP_MSFILTER:
1348 error = inp_getmoptions(inp, sopt);
1349 break;
1350
1351 #ifdef IPSEC
1352 case IP_IPSEC_POLICY:
1353 {
1354 struct mbuf *m = NULL;
1355 caddr_t req = NULL;
1356 size_t len = 0;
1357
1358 if (m != NULL) {
1359 req = mtod(m, caddr_t);
1360 len = m->m_len;
1361 }
1362 error = ipsec_get_policy(sotoinpcb(so), req, len, &m);
1363 if (error == 0)
1364 error = soopt_mcopyout(sopt, m); /* XXX */
1365 if (error == 0)
1366 m_freem(m);
1367 break;
1368 }
1369 #endif /* IPSEC */
1370
1371 default:
1372 error = ENOPROTOOPT;
1373 break;
1374 }
1375 break;
1376 }
1377 return (error);
1378 }
1379
1380 /*
1381 * Routine called from ip_output() to loop back a copy of an IP multicast
1382 * packet to the input queue of a specified interface. Note that this
1383 * calls the output routine of the loopback "driver", but with an interface
1384 * pointer that might NOT be a loopback interface -- evil, but easier than
1385 * replicating that code here.
1386 */
1387 static void
1388 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1389 {
1390 struct ip *ip;
1391 struct mbuf *copym;
1392
1393 /*
1394 * Make a deep copy of the packet because we're going to
1395 * modify the pack in order to generate checksums.
1396 */
1397 copym = m_dup(m, M_NOWAIT);
1398 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1399 copym = m_pullup(copym, hlen);
1400 if (copym != NULL) {
1401 /* If needed, compute the checksum and mark it as valid. */
1402 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1403 in_delayed_cksum(copym);
1404 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1405 copym->m_pkthdr.csum_flags |=
1406 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1407 copym->m_pkthdr.csum_data = 0xffff;
1408 }
1409 /*
1410 * We don't bother to fragment if the IP length is greater
1411 * than the interface's MTU. Can this possibly matter?
1412 */
1413 ip = mtod(copym, struct ip *);
1414 ip->ip_sum = 0;
1415 ip->ip_sum = in_cksum(copym, hlen);
1416 if_simloop(ifp, copym, AF_INET, 0);
1417 }
1418 }
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