2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1988, 1990, 1993
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31 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_ipsec.h"
39 #include "opt_kern_tls.h"
40 #include "opt_mbuf_stress_test.h"
41 #include "opt_ratelimit.h"
42 #include "opt_route.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
51 #include <sys/malloc.h>
55 #include <sys/protosw.h>
56 #include <sys/rmlock.h>
58 #include <sys/socket.h>
59 #include <sys/socketvar.h>
60 #include <sys/sysctl.h>
61 #include <sys/ucred.h>
64 #include <net/if_var.h>
65 #include <net/if_vlan_var.h>
66 #include <net/if_llatbl.h>
67 #include <net/ethernet.h>
68 #include <net/netisr.h>
70 #include <net/route.h>
71 #include <net/route/nhop.h>
72 #include <net/rss_config.h>
75 #include <netinet/in.h>
76 #include <netinet/in_fib.h>
77 #include <netinet/in_kdtrace.h>
78 #include <netinet/in_systm.h>
79 #include <netinet/ip.h>
80 #include <netinet/in_fib.h>
81 #include <netinet/in_pcb.h>
82 #include <netinet/in_rss.h>
83 #include <netinet/in_var.h>
84 #include <netinet/ip_var.h>
85 #include <netinet/ip_options.h>
87 #include <netinet/udp.h>
88 #include <netinet/udp_var.h>
90 #if defined(SCTP) || defined(SCTP_SUPPORT)
91 #include <netinet/sctp.h>
92 #include <netinet/sctp_crc32.h>
95 #include <netipsec/ipsec_support.h>
97 #include <machine/in_cksum.h>
99 #include <security/mac/mac_framework.h>
101 #ifdef MBUF_STRESS_TEST
102 static int mbuf_frag_size = 0;
103 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
104 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
107 static void ip_mloopback(struct ifnet *, const struct mbuf *, int);
109 extern int in_mcast_loop;
110 extern struct protosw inetsw[];
113 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags,
114 struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error)
116 struct m_tag *fwd_tag = NULL;
120 int pflags = PFIL_OUT;
122 if (flags & IP_FORWARDING)
126 ip = mtod(m, struct ip *);
128 /* Run through list of hooks for output packets. */
129 odst.s_addr = ip->ip_dst.s_addr;
130 switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, pflags, inp)) {
135 return 1; /* Finished */
140 ip = mtod(m, struct ip *);
142 /* See if destination IP address was changed by packet filter. */
143 if (odst.s_addr != ip->ip_dst.s_addr) {
144 m->m_flags |= M_SKIP_FIREWALL;
145 /* If destination is now ourself drop to ip_input(). */
146 if (in_localip(ip->ip_dst)) {
147 m->m_flags |= M_FASTFWD_OURS;
148 if (m->m_pkthdr.rcvif == NULL)
149 m->m_pkthdr.rcvif = V_loif;
150 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
151 m->m_pkthdr.csum_flags |=
152 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
153 m->m_pkthdr.csum_data = 0xffff;
155 m->m_pkthdr.csum_flags |=
156 CSUM_IP_CHECKED | CSUM_IP_VALID;
157 #if defined(SCTP) || defined(SCTP_SUPPORT)
158 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
159 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
161 *error = netisr_queue(NETISR_IP, m);
162 return 1; /* Finished */
165 bzero(dst, sizeof(*dst));
166 dst->sin_family = AF_INET;
167 dst->sin_len = sizeof(*dst);
168 dst->sin_addr = ip->ip_dst;
170 return -1; /* Reloop */
172 /* See if fib was changed by packet filter. */
173 if ((*fibnum) != M_GETFIB(m)) {
174 m->m_flags |= M_SKIP_FIREWALL;
175 *fibnum = M_GETFIB(m);
176 return -1; /* Reloop for FIB change */
179 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
180 if (m->m_flags & M_FASTFWD_OURS) {
181 if (m->m_pkthdr.rcvif == NULL)
182 m->m_pkthdr.rcvif = V_loif;
183 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
184 m->m_pkthdr.csum_flags |=
185 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
186 m->m_pkthdr.csum_data = 0xffff;
188 #if defined(SCTP) || defined(SCTP_SUPPORT)
189 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
190 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
192 m->m_pkthdr.csum_flags |=
193 CSUM_IP_CHECKED | CSUM_IP_VALID;
195 *error = netisr_queue(NETISR_IP, m);
196 return 1; /* Finished */
198 /* Or forward to some other address? */
199 if ((m->m_flags & M_IP_NEXTHOP) &&
200 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
201 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
202 m->m_flags |= M_SKIP_FIREWALL;
203 m->m_flags &= ~M_IP_NEXTHOP;
204 m_tag_delete(m, fwd_tag);
206 return -1; /* Reloop for CHANGE of dst */
213 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m,
214 const struct sockaddr *gw, struct route *ro, bool stamp_tag)
217 struct ktls_session *tls = NULL;
219 struct m_snd_tag *mst;
222 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
227 * If this is an unencrypted TLS record, save a reference to
228 * the record. This local reference is used to call
229 * ktls_output_eagain after the mbuf has been freed (thus
230 * dropping the mbuf's reference) in if_output.
232 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
233 tls = ktls_hold(m->m_next->m_epg_tls);
237 * If a TLS session doesn't have a valid tag, it must
238 * have had an earlier ifp mismatch, so drop this
247 * Always stamp tags that include NIC ktls.
253 if (inp != NULL && mst == NULL) {
254 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
255 (inp->inp_snd_tag != NULL &&
256 inp->inp_snd_tag->ifp != ifp))
257 in_pcboutput_txrtlmt(inp, ifp, m);
259 if (inp->inp_snd_tag != NULL)
260 mst = inp->inp_snd_tag;
263 if (stamp_tag && mst != NULL) {
264 KASSERT(m->m_pkthdr.rcvif == NULL,
265 ("trying to add a send tag to a forwarded packet"));
266 if (mst->ifp != ifp) {
272 /* stamp send tag on mbuf */
273 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
274 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
277 error = (*ifp->if_output)(ifp, m, gw, ro);
280 /* Check for route change invalidating send tags. */
284 error = ktls_output_eagain(inp, tls);
290 in_pcboutput_eagain(inp);
295 /* rte<>ro_flags translation */
297 rt_update_ro_flags(struct route *ro, const struct nhop_object *nh)
299 int nh_flags = nh->nh_flags;
301 ro->ro_flags &= ~ (RT_REJECT|RT_BLACKHOLE|RT_HAS_GW);
303 ro->ro_flags |= (nh_flags & NHF_REJECT) ? RT_REJECT : 0;
304 ro->ro_flags |= (nh_flags & NHF_BLACKHOLE) ? RT_BLACKHOLE : 0;
305 ro->ro_flags |= (nh_flags & NHF_GATEWAY) ? RT_HAS_GW : 0;
309 * IP output. The packet in mbuf chain m contains a skeletal IP
310 * header (with len, off, ttl, proto, tos, src, dst).
311 * The mbuf chain containing the packet will be freed.
312 * The mbuf opt, if present, will not be freed.
313 * If route ro is present and has ro_rt initialized, route lookup would be
314 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
315 * then result of route lookup is stored in ro->ro_rt.
317 * In the IP forwarding case, the packet will arrive with options already
318 * inserted, so must have a NULL opt pointer.
321 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
322 struct ip_moptions *imo, struct inpcb *inp)
324 struct rm_priotracker in_ifa_tracker;
326 struct ifnet *ifp = NULL; /* keep compiler happy */
328 int hlen = sizeof (struct ip);
332 struct sockaddr_in *dst;
333 const struct sockaddr *gw;
334 struct in_ifaddr *ia = NULL;
337 uint16_t ip_len, ip_off;
338 struct route iproute;
340 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
341 int no_route_but_check_spd = 0;
348 INP_LOCK_ASSERT(inp);
349 M_SETFIB(m, inp->inp_inc.inc_fibnum);
350 if ((flags & IP_NODEFAULTFLOWID) == 0) {
351 m->m_pkthdr.flowid = inp->inp_flowid;
352 M_HASHTYPE_SET(m, inp->inp_flowtype);
354 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
355 vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
358 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
364 m = ip_insertoptions(m, opt, &len);
366 hlen = len; /* ip->ip_hl is updated above */
368 ip = mtod(m, struct ip *);
369 ip_len = ntohs(ip->ip_len);
370 ip_off = ntohs(ip->ip_off);
372 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
373 ip->ip_v = IPVERSION;
374 ip->ip_hl = hlen >> 2;
377 /* Header already set, fetch hlen from there */
378 hlen = ip->ip_hl << 2;
380 if ((flags & IP_FORWARDING) == 0)
381 IPSTAT_INC(ips_localout);
386 * gw is readonly but can point either to dst OR rt_gateway,
387 * therefore we need restore gw if we're redoing lookup.
389 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
392 bzero(ro, sizeof (*ro));
394 dst = (struct sockaddr_in *)&ro->ro_dst;
395 if (ro->ro_nh == NULL) {
396 dst->sin_family = AF_INET;
397 dst->sin_len = sizeof(*dst);
398 dst->sin_addr = ip->ip_dst;
400 gw = (const struct sockaddr *)dst;
403 * Validate route against routing table additions;
404 * a better/more specific route might have been added.
406 if (inp != NULL && ro->ro_nh != NULL)
407 NH_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
409 * If there is a cached route,
410 * check that it is to the same destination
411 * and is still up. If not, free it and try again.
412 * The address family should also be checked in case of sharing the
414 * Also check whether routing cache needs invalidation.
416 if (ro->ro_nh != NULL &&
417 ((!NH_IS_VALID(ro->ro_nh)) || dst->sin_family != AF_INET ||
418 dst->sin_addr.s_addr != ip->ip_dst.s_addr))
419 RO_INVALIDATE_CACHE(ro);
422 * If routing to interface only, short circuit routing lookup.
423 * The use of an all-ones broadcast address implies this; an
424 * interface is specified by the broadcast address of an interface,
425 * or the destination address of a ptp interface.
427 if (flags & IP_SENDONES) {
428 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
429 M_GETFIB(m)))) == NULL &&
430 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
431 M_GETFIB(m)))) == NULL) {
432 IPSTAT_INC(ips_noroute);
436 ip->ip_dst.s_addr = INADDR_BROADCAST;
437 dst->sin_addr = ip->ip_dst;
442 src = IA_SIN(ia)->sin_addr;
443 } else if (flags & IP_ROUTETOIF) {
444 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
445 M_GETFIB(m)))) == NULL &&
446 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
447 M_GETFIB(m)))) == NULL) {
448 IPSTAT_INC(ips_noroute);
455 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
456 in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
457 src = IA_SIN(ia)->sin_addr;
458 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
459 imo != NULL && imo->imo_multicast_ifp != NULL) {
461 * Bypass the normal routing lookup for multicast
462 * packets if the interface is specified.
464 ifp = imo->imo_multicast_ifp;
466 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
467 isbroadcast = 0; /* fool gcc */
468 /* Interface may have no addresses. */
470 src = IA_SIN(ia)->sin_addr;
472 src.s_addr = INADDR_ANY;
473 } else if (ro != &iproute) {
474 if (ro->ro_nh == NULL) {
476 * We want to do any cloning requested by the link
477 * layer, as this is probably required in all cases
478 * for correct operation (as it is for ARP).
481 flowid = m->m_pkthdr.flowid;
482 ro->ro_nh = fib4_lookup(fibnum, dst->sin_addr, 0,
485 if (ro->ro_nh == NULL || (!NH_IS_VALID(ro->ro_nh))) {
486 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
488 * There is no route for this packet, but it is
489 * possible that a matching SPD entry exists.
491 no_route_but_check_spd = 1;
494 IPSTAT_INC(ips_noroute);
495 error = EHOSTUNREACH;
499 struct nhop_object *nh = ro->ro_nh;
501 ia = ifatoia(nh->nh_ifa);
503 counter_u64_add(nh->nh_pksent, 1);
504 rt_update_ro_flags(ro, nh);
505 if (nh->nh_flags & NHF_GATEWAY)
507 if (nh->nh_flags & NHF_HOST)
508 isbroadcast = (nh->nh_flags & NHF_BROADCAST);
509 else if ((ifp->if_flags & IFF_BROADCAST) && (gw->sa_family == AF_INET))
510 isbroadcast = in_ifaddr_broadcast(((const struct sockaddr_in *)gw)->sin_addr, ia);
514 src = IA_SIN(ia)->sin_addr;
516 struct nhop_object *nh;
518 nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_NONE,
521 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
523 * There is no route for this packet, but it is
524 * possible that a matching SPD entry exists.
526 no_route_but_check_spd = 1;
529 IPSTAT_INC(ips_noroute);
530 error = EHOSTUNREACH;
535 rt_update_ro_flags(ro, nh);
536 if (nh->nh_flags & NHF_GATEWAY)
538 ia = ifatoia(nh->nh_ifa);
539 src = IA_SIN(ia)->sin_addr;
540 isbroadcast = (((nh->nh_flags & (NHF_HOST | NHF_BROADCAST)) ==
541 (NHF_HOST | NHF_BROADCAST)) ||
542 ((ifp->if_flags & IFF_BROADCAST) &&
543 (gw->sa_family == AF_INET) &&
544 in_ifaddr_broadcast(((const struct sockaddr_in *)gw)->sin_addr, ia)));
547 /* Catch a possible divide by zero later. */
548 KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (nh_flags=0x%08x) ifp=%p",
550 (ro != NULL && ro->ro_nh != NULL) ? ro->ro_nh->nh_flags : 0, ifp));
552 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
553 m->m_flags |= M_MCAST;
555 * IP destination address is multicast. Make sure "gw"
556 * still points to the address in "ro". (It may have been
557 * changed to point to a gateway address, above.)
559 gw = (const struct sockaddr *)dst;
561 * See if the caller provided any multicast options
564 ip->ip_ttl = imo->imo_multicast_ttl;
565 if (imo->imo_multicast_vif != -1)
568 ip_mcast_src(imo->imo_multicast_vif) :
571 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
573 * Confirm that the outgoing interface supports multicast.
575 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
576 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
577 IPSTAT_INC(ips_noroute);
583 * If source address not specified yet, use address
584 * of outgoing interface.
586 if (ip->ip_src.s_addr == INADDR_ANY)
589 if ((imo == NULL && in_mcast_loop) ||
590 (imo && imo->imo_multicast_loop)) {
592 * Loop back multicast datagram if not expressly
593 * forbidden to do so, even if we are not a member
594 * of the group; ip_input() will filter it later,
595 * thus deferring a hash lookup and mutex acquisition
596 * at the expense of a cheap copy using m_copym().
598 ip_mloopback(ifp, m, hlen);
601 * If we are acting as a multicast router, perform
602 * multicast forwarding as if the packet had just
603 * arrived on the interface to which we are about
604 * to send. The multicast forwarding function
605 * recursively calls this function, using the
606 * IP_FORWARDING flag to prevent infinite recursion.
608 * Multicasts that are looped back by ip_mloopback(),
609 * above, will be forwarded by the ip_input() routine,
612 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
614 * If rsvp daemon is not running, do not
615 * set ip_moptions. This ensures that the packet
616 * is multicast and not just sent down one link
617 * as prescribed by rsvpd.
622 ip_mforward(ip, ifp, m, imo) != 0) {
630 * Multicasts with a time-to-live of zero may be looped-
631 * back, above, but must not be transmitted on a network.
632 * Also, multicasts addressed to the loopback interface
633 * are not sent -- the above call to ip_mloopback() will
634 * loop back a copy. ip_input() will drop the copy if
635 * this host does not belong to the destination group on
636 * the loopback interface.
638 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
647 * If the source address is not specified yet, use the address
648 * of the outoing interface.
650 if (ip->ip_src.s_addr == INADDR_ANY)
654 * Look for broadcast address and
655 * verify user is allowed to send
659 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
660 error = EADDRNOTAVAIL;
663 if ((flags & IP_ALLOWBROADCAST) == 0) {
667 /* don't allow broadcast messages to be fragmented */
672 m->m_flags |= M_BCAST;
674 m->m_flags &= ~M_BCAST;
678 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
679 if (IPSEC_ENABLED(ipv4)) {
680 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
681 if (error == EINPROGRESS)
687 * Check if there was a route for this packet; return error if not.
689 if (no_route_but_check_spd) {
690 IPSTAT_INC(ips_noroute);
691 error = EHOSTUNREACH;
694 /* Update variables that are affected by ipsec4_output(). */
695 ip = mtod(m, struct ip *);
696 hlen = ip->ip_hl << 2;
699 /* Jump over all PFIL processing if hooks are not active. */
700 if (PFIL_HOOKED_OUT(V_inet_pfil_head)) {
701 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum,
703 case 1: /* Finished */
706 case 0: /* Continue normally */
707 ip = mtod(m, struct ip *);
710 case -1: /* Need to try again */
711 /* Reset everything for a new round */
714 ro->ro_prepend = NULL;
716 gw = (const struct sockaddr *)dst;
717 ip = mtod(m, struct ip *);
723 EVL_APPLY_PRI(m, vlan_pcp);
725 /* IN_LOOPBACK must not appear on the wire - RFC1122. */
726 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
727 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
728 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
729 IPSTAT_INC(ips_badaddr);
730 error = EADDRNOTAVAIL;
735 /* Ensure the packet data is mapped if the interface requires it. */
736 if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) {
737 m = mb_unmapped_to_ext(m);
739 IPSTAT_INC(ips_odropped);
745 m->m_pkthdr.csum_flags |= CSUM_IP;
746 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
748 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
750 #if defined(SCTP) || defined(SCTP_SUPPORT)
751 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
752 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
753 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
758 * If small enough for interface, or the interface will take
759 * care of the fragmentation for us, we can just send directly.
760 * Note that if_vxlan could have requested TSO even though the outer
761 * frame is UDP. It is correct to not fragment such datagrams and
762 * instead just pass them on to the driver.
765 (m->m_pkthdr.csum_flags & ifp->if_hwassist &
766 (CSUM_TSO | CSUM_INNER_TSO)) != 0) {
768 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
769 ip->ip_sum = in_cksum(m, hlen);
770 m->m_pkthdr.csum_flags &= ~CSUM_IP;
774 * Record statistics for this interface address.
775 * With CSUM_TSO the byte/packet count will be slightly
776 * incorrect because we count the IP+TCP headers only
777 * once instead of for every generated packet.
779 if (!(flags & IP_FORWARDING) && ia) {
780 if (m->m_pkthdr.csum_flags &
781 (CSUM_TSO | CSUM_INNER_TSO))
782 counter_u64_add(ia->ia_ifa.ifa_opackets,
783 m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
785 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
787 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
789 #ifdef MBUF_STRESS_TEST
790 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
791 m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
794 * Reset layer specific mbuf flags
795 * to avoid confusing lower layers.
798 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
799 error = ip_output_send(inp, ifp, m, gw, ro,
800 (flags & IP_NO_SND_TAG_RL) ? false : true);
804 /* Balk when DF bit is set or the interface didn't support TSO. */
805 if ((ip_off & IP_DF) ||
806 (m->m_pkthdr.csum_flags & (CSUM_TSO | CSUM_INNER_TSO))) {
808 IPSTAT_INC(ips_cantfrag);
813 * Too large for interface; fragment if possible. If successful,
814 * on return, m will point to a list of packets to be sent.
816 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
823 /* Record statistics for this interface address. */
825 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
826 counter_u64_add(ia->ia_ifa.ifa_obytes,
830 * Reset layer specific mbuf flags
831 * to avoid confusing upper layers.
835 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
836 mtod(m, struct ip *), NULL);
837 error = ip_output_send(inp, ifp, m, gw, ro, true);
843 IPSTAT_INC(ips_fragmented);
853 * Create a chain of fragments which fit the given mtu. m_frag points to the
854 * mbuf to be fragmented; on return it points to the chain with the fragments.
855 * Return 0 if no error. If error, m_frag may contain a partially built
856 * chain of fragments that should be freed by the caller.
858 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
861 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
862 u_long if_hwassist_flags)
865 int hlen = ip->ip_hl << 2;
866 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
868 struct mbuf *m0 = *m_frag; /* the original packet */
872 uint16_t ip_len, ip_off;
874 ip_len = ntohs(ip->ip_len);
875 ip_off = ntohs(ip->ip_off);
877 if (ip_off & IP_DF) { /* Fragmentation not allowed */
878 IPSTAT_INC(ips_cantfrag);
883 * Must be able to put at least 8 bytes per fragment.
889 * If the interface will not calculate checksums on
890 * fragmented packets, then do it here.
892 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
893 in_delayed_cksum(m0);
894 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
896 #if defined(SCTP) || defined(SCTP_SUPPORT)
897 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
898 sctp_delayed_cksum(m0, hlen);
899 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
902 if (len > PAGE_SIZE) {
904 * Fragment large datagrams such that each segment
905 * contains a multiple of PAGE_SIZE amount of data,
906 * plus headers. This enables a receiver to perform
907 * page-flipping zero-copy optimizations.
909 * XXX When does this help given that sender and receiver
910 * could have different page sizes, and also mtu could
911 * be less than the receiver's page size ?
915 off = MIN(mtu, m0->m_pkthdr.len);
918 * firstlen (off - hlen) must be aligned on an
922 goto smart_frag_failure;
923 off = ((off - hlen) & ~7) + hlen;
924 newlen = (~PAGE_MASK) & mtu;
925 if ((newlen + sizeof (struct ip)) > mtu) {
926 /* we failed, go back the default */
937 firstlen = off - hlen;
938 mnext = &m0->m_nextpkt; /* pointer to next packet */
941 * Loop through length of segment after first fragment,
942 * make new header and copy data of each part and link onto chain.
943 * Here, m0 is the original packet, m is the fragment being created.
944 * The fragments are linked off the m_nextpkt of the original
945 * packet, which after processing serves as the first fragment.
947 for (nfrags = 1; off < ip_len; off += len, nfrags++) {
948 struct ip *mhip; /* ip header on the fragment */
950 int mhlen = sizeof (struct ip);
952 m = m_gethdr(M_NOWAIT, MT_DATA);
955 IPSTAT_INC(ips_odropped);
959 * Make sure the complete packet header gets copied
960 * from the originating mbuf to the newly created
961 * mbuf. This also ensures that existing firewall
962 * classification(s), VLAN tags and so on get copied
963 * to the resulting fragmented packet(s):
965 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
968 IPSTAT_INC(ips_odropped);
972 * In the first mbuf, leave room for the link header, then
973 * copy the original IP header including options. The payload
974 * goes into an additional mbuf chain returned by m_copym().
976 m->m_data += max_linkhdr;
977 mhip = mtod(m, struct ip *);
979 if (hlen > sizeof (struct ip)) {
980 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
981 mhip->ip_v = IPVERSION;
982 mhip->ip_hl = mhlen >> 2;
985 /* XXX do we need to add ip_off below ? */
986 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
987 if (off + len >= ip_len)
990 mhip->ip_off |= IP_MF;
991 mhip->ip_len = htons((u_short)(len + mhlen));
992 m->m_next = m_copym(m0, off, len, M_NOWAIT);
993 if (m->m_next == NULL) { /* copy failed */
995 error = ENOBUFS; /* ??? */
996 IPSTAT_INC(ips_odropped);
999 m->m_pkthdr.len = mhlen + len;
1001 mac_netinet_fragment(m0, m);
1003 mhip->ip_off = htons(mhip->ip_off);
1005 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1006 mhip->ip_sum = in_cksum(m, mhlen);
1007 m->m_pkthdr.csum_flags &= ~CSUM_IP;
1010 mnext = &m->m_nextpkt;
1012 IPSTAT_ADD(ips_ofragments, nfrags);
1015 * Update first fragment by trimming what's been copied out
1016 * and updating header.
1018 m_adj(m0, hlen + firstlen - ip_len);
1019 m0->m_pkthdr.len = hlen + firstlen;
1020 ip->ip_len = htons((u_short)m0->m_pkthdr.len);
1021 ip->ip_off = htons(ip_off | IP_MF);
1023 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
1024 ip->ip_sum = in_cksum(m0, hlen);
1025 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
1034 in_delayed_cksum(struct mbuf *m)
1038 uint16_t cklen, csum, offset;
1040 ip = mtod(m, struct ip *);
1041 offset = ip->ip_hl << 2 ;
1043 if (m->m_pkthdr.csum_flags & CSUM_UDP) {
1044 /* if udp header is not in the first mbuf copy udplen */
1045 if (offset + sizeof(struct udphdr) > m->m_len) {
1046 m_copydata(m, offset + offsetof(struct udphdr,
1047 uh_ulen), sizeof(cklen), (caddr_t)&cklen);
1048 cklen = ntohs(cklen);
1050 uh = (struct udphdr *)mtodo(m, offset);
1051 cklen = ntohs(uh->uh_ulen);
1053 csum = in_cksum_skip(m, cklen + offset, offset);
1057 cklen = ntohs(ip->ip_len);
1058 csum = in_cksum_skip(m, cklen, offset);
1060 offset += m->m_pkthdr.csum_data; /* checksum offset */
1062 if (offset + sizeof(csum) > m->m_len)
1063 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
1065 *(u_short *)mtodo(m, offset) = csum;
1069 * IP socket option processing.
1072 ip_ctloutput(struct socket *so, struct sockopt *sopt)
1074 struct inpcb *inp = sotoinpcb(so);
1077 uint32_t rss_bucket;
1082 if (sopt->sopt_level != IPPROTO_IP) {
1085 if (sopt->sopt_level == SOL_SOCKET &&
1086 sopt->sopt_dir == SOPT_SET) {
1087 switch (sopt->sopt_name) {
1090 if ((so->so_options & SO_REUSEADDR) != 0)
1091 inp->inp_flags2 |= INP_REUSEADDR;
1093 inp->inp_flags2 &= ~INP_REUSEADDR;
1099 if ((so->so_options & SO_REUSEPORT) != 0)
1100 inp->inp_flags2 |= INP_REUSEPORT;
1102 inp->inp_flags2 &= ~INP_REUSEPORT;
1106 case SO_REUSEPORT_LB:
1108 if ((so->so_options & SO_REUSEPORT_LB) != 0)
1109 inp->inp_flags2 |= INP_REUSEPORT_LB;
1111 inp->inp_flags2 &= ~INP_REUSEPORT_LB;
1117 inp->inp_inc.inc_fibnum = so->so_fibnum;
1121 case SO_MAX_PACING_RATE:
1124 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1138 switch (sopt->sopt_dir) {
1140 switch (sopt->sopt_name) {
1147 if (sopt->sopt_valsize > MLEN) {
1151 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
1156 m->m_len = sopt->sopt_valsize;
1157 error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1164 error = ip_pcbopts(inp, sopt->sopt_name, m);
1170 if (sopt->sopt_td != NULL) {
1171 error = priv_check(sopt->sopt_td,
1172 PRIV_NETINET_BINDANY);
1179 case IP_RSS_LISTEN_BUCKET:
1185 case IP_RECVRETOPTS:
1186 case IP_ORIGDSTADDR:
1187 case IP_RECVDSTADDR:
1195 case IP_RECVRSSBUCKETID:
1198 error = sooptcopyin(sopt, &optval, sizeof optval,
1203 switch (sopt->sopt_name) {
1205 inp->inp_ip_tos = optval;
1209 inp->inp_ip_ttl = optval;
1213 if (optval >= 0 && optval <= MAXTTL)
1214 inp->inp_ip_minttl = optval;
1219 #define OPTSET(bit) do { \
1222 inp->inp_flags |= bit; \
1224 inp->inp_flags &= ~bit; \
1228 #define OPTSET2(bit, val) do { \
1231 inp->inp_flags2 |= bit; \
1233 inp->inp_flags2 &= ~bit; \
1238 OPTSET(INP_RECVOPTS);
1241 case IP_RECVRETOPTS:
1242 OPTSET(INP_RECVRETOPTS);
1245 case IP_RECVDSTADDR:
1246 OPTSET(INP_RECVDSTADDR);
1249 case IP_ORIGDSTADDR:
1250 OPTSET2(INP_ORIGDSTADDR, optval);
1254 OPTSET(INP_RECVTTL);
1262 OPTSET(INP_ONESBCAST);
1265 OPTSET(INP_DONTFRAG);
1268 OPTSET(INP_BINDANY);
1271 OPTSET(INP_RECVTOS);
1274 OPTSET2(INP_BINDMULTI, optval);
1277 OPTSET2(INP_RECVFLOWID, optval);
1280 case IP_RSS_LISTEN_BUCKET:
1281 if ((optval >= 0) &&
1282 (optval < rss_getnumbuckets())) {
1283 inp->inp_rss_listen_bucket = optval;
1284 OPTSET2(INP_RSS_BUCKET_SET, 1);
1289 case IP_RECVRSSBUCKETID:
1290 OPTSET2(INP_RECVRSSBUCKETID, optval);
1294 if ((optval >= -1) && (optval <=
1295 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1309 optval << INP_2PCP_SHIFT;
1321 * Multicast socket options are processed by the in_mcast
1324 case IP_MULTICAST_IF:
1325 case IP_MULTICAST_VIF:
1326 case IP_MULTICAST_TTL:
1327 case IP_MULTICAST_LOOP:
1328 case IP_ADD_MEMBERSHIP:
1329 case IP_DROP_MEMBERSHIP:
1330 case IP_ADD_SOURCE_MEMBERSHIP:
1331 case IP_DROP_SOURCE_MEMBERSHIP:
1332 case IP_BLOCK_SOURCE:
1333 case IP_UNBLOCK_SOURCE:
1335 case MCAST_JOIN_GROUP:
1336 case MCAST_LEAVE_GROUP:
1337 case MCAST_JOIN_SOURCE_GROUP:
1338 case MCAST_LEAVE_SOURCE_GROUP:
1339 case MCAST_BLOCK_SOURCE:
1340 case MCAST_UNBLOCK_SOURCE:
1341 error = inp_setmoptions(inp, sopt);
1345 error = sooptcopyin(sopt, &optval, sizeof optval,
1352 case IP_PORTRANGE_DEFAULT:
1353 inp->inp_flags &= ~(INP_LOWPORT);
1354 inp->inp_flags &= ~(INP_HIGHPORT);
1357 case IP_PORTRANGE_HIGH:
1358 inp->inp_flags &= ~(INP_LOWPORT);
1359 inp->inp_flags |= INP_HIGHPORT;
1362 case IP_PORTRANGE_LOW:
1363 inp->inp_flags &= ~(INP_HIGHPORT);
1364 inp->inp_flags |= INP_LOWPORT;
1374 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1375 case IP_IPSEC_POLICY:
1376 if (IPSEC_ENABLED(ipv4)) {
1377 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1384 error = ENOPROTOOPT;
1390 switch (sopt->sopt_name) {
1394 if (inp->inp_options) {
1395 struct mbuf *options;
1397 options = m_copym(inp->inp_options, 0,
1398 M_COPYALL, M_NOWAIT);
1400 if (options != NULL) {
1401 error = sooptcopyout(sopt,
1402 mtod(options, char *),
1409 sopt->sopt_valsize = 0;
1417 case IP_RECVRETOPTS:
1418 case IP_ORIGDSTADDR:
1419 case IP_RECVDSTADDR:
1432 case IP_RSSBUCKETID:
1433 case IP_RECVRSSBUCKETID:
1436 switch (sopt->sopt_name) {
1438 optval = inp->inp_ip_tos;
1442 optval = inp->inp_ip_ttl;
1446 optval = inp->inp_ip_minttl;
1449 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
1450 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0)
1453 optval = OPTBIT(INP_RECVOPTS);
1456 case IP_RECVRETOPTS:
1457 optval = OPTBIT(INP_RECVRETOPTS);
1460 case IP_RECVDSTADDR:
1461 optval = OPTBIT(INP_RECVDSTADDR);
1464 case IP_ORIGDSTADDR:
1465 optval = OPTBIT2(INP_ORIGDSTADDR);
1469 optval = OPTBIT(INP_RECVTTL);
1473 optval = OPTBIT(INP_RECVIF);
1477 if (inp->inp_flags & INP_HIGHPORT)
1478 optval = IP_PORTRANGE_HIGH;
1479 else if (inp->inp_flags & INP_LOWPORT)
1480 optval = IP_PORTRANGE_LOW;
1486 optval = OPTBIT(INP_ONESBCAST);
1489 optval = OPTBIT(INP_DONTFRAG);
1492 optval = OPTBIT(INP_BINDANY);
1495 optval = OPTBIT(INP_RECVTOS);
1498 optval = inp->inp_flowid;
1501 optval = inp->inp_flowtype;
1504 optval = OPTBIT2(INP_RECVFLOWID);
1507 case IP_RSSBUCKETID:
1508 retval = rss_hash2bucket(inp->inp_flowid,
1512 optval = rss_bucket;
1516 case IP_RECVRSSBUCKETID:
1517 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1521 optval = OPTBIT2(INP_BINDMULTI);
1524 if (OPTBIT2(INP_2PCP_SET)) {
1525 optval = (inp->inp_flags2 &
1526 INP_2PCP_MASK) >> INP_2PCP_SHIFT;
1532 error = sooptcopyout(sopt, &optval, sizeof optval);
1536 * Multicast socket options are processed by the in_mcast
1539 case IP_MULTICAST_IF:
1540 case IP_MULTICAST_VIF:
1541 case IP_MULTICAST_TTL:
1542 case IP_MULTICAST_LOOP:
1544 error = inp_getmoptions(inp, sopt);
1547 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1548 case IP_IPSEC_POLICY:
1549 if (IPSEC_ENABLED(ipv4)) {
1550 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1557 error = ENOPROTOOPT;
1566 * Routine called from ip_output() to loop back a copy of an IP multicast
1567 * packet to the input queue of a specified interface. Note that this
1568 * calls the output routine of the loopback "driver", but with an interface
1569 * pointer that might NOT be a loopback interface -- evil, but easier than
1570 * replicating that code here.
1573 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1579 * Make a deep copy of the packet because we're going to
1580 * modify the pack in order to generate checksums.
1582 copym = m_dup(m, M_NOWAIT);
1583 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1584 copym = m_pullup(copym, hlen);
1585 if (copym != NULL) {
1586 /* If needed, compute the checksum and mark it as valid. */
1587 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1588 in_delayed_cksum(copym);
1589 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1590 copym->m_pkthdr.csum_flags |=
1591 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1592 copym->m_pkthdr.csum_data = 0xffff;
1595 * We don't bother to fragment if the IP length is greater
1596 * than the interface's MTU. Can this possibly matter?
1598 ip = mtod(copym, struct ip *);
1600 ip->ip_sum = in_cksum(copym, hlen);
1601 if_simloop(ifp, copym, AF_INET, 0);