2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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)
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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
31 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
35 #include "opt_inet6.h"
36 #include "opt_netgraph.h"
37 #include "opt_mbuf_profiling.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/devctl.h>
43 #include <sys/eventhandler.h>
45 #include <sys/kernel.h>
47 #include <sys/malloc.h>
49 #include <sys/module.h>
53 #include <sys/random.h>
54 #include <sys/socket.h>
55 #include <sys/sockio.h>
56 #include <sys/sysctl.h>
62 #include <net/ieee_oui.h>
64 #include <net/if_var.h>
65 #include <net/if_private.h>
66 #include <net/if_arp.h>
67 #include <net/netisr.h>
68 #include <net/route.h>
69 #include <net/if_llc.h>
70 #include <net/if_dl.h>
71 #include <net/if_types.h>
73 #include <net/ethernet.h>
74 #include <net/if_bridgevar.h>
75 #include <net/if_vlan_var.h>
76 #include <net/if_llatbl.h>
78 #include <net/rss_config.h>
81 #include <netpfil/pf/pf_mtag.h>
83 #if defined(INET) || defined(INET6)
84 #include <netinet/in.h>
85 #include <netinet/in_var.h>
86 #include <netinet/if_ether.h>
87 #include <netinet/ip_carp.h>
88 #include <netinet/ip_var.h>
91 #include <netinet6/nd6.h>
93 #include <security/mac/mac_framework.h>
95 #include <crypto/sha1.h>
98 CTASSERT(sizeof (struct ether_header) == ETHER_ADDR_LEN * 2 + 2);
99 CTASSERT(sizeof (struct ether_addr) == ETHER_ADDR_LEN);
102 VNET_DEFINE(pfil_head_t, link_pfil_head); /* Packet filter hooks */
104 /* netgraph node hooks for ng_ether(4) */
105 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
106 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
107 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
108 void (*ng_ether_attach_p)(struct ifnet *ifp);
109 void (*ng_ether_detach_p)(struct ifnet *ifp);
111 void (*vlan_input_p)(struct ifnet *, struct mbuf *);
113 /* if_bridge(4) support */
114 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
116 /* if_lagg(4) support */
117 struct mbuf *(*lagg_input_ethernet_p)(struct ifnet *, struct mbuf *);
119 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
120 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
122 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
124 static int ether_requestencap(struct ifnet *, struct if_encap_req *);
126 static inline bool ether_do_pcp(struct ifnet *, struct mbuf *);
128 #define senderr(e) do { error = (e); goto bad;} while (0)
131 update_mbuf_csumflags(struct mbuf *src, struct mbuf *dst)
135 if (src->m_pkthdr.csum_flags & CSUM_IP)
136 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
137 if (src->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
138 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
139 if (src->m_pkthdr.csum_flags & CSUM_SCTP)
140 csum_flags |= CSUM_SCTP_VALID;
141 dst->m_pkthdr.csum_flags |= csum_flags;
142 if (csum_flags & CSUM_DATA_VALID)
143 dst->m_pkthdr.csum_data = 0xffff;
147 * Handle link-layer encapsulation requests.
150 ether_requestencap(struct ifnet *ifp, struct if_encap_req *req)
152 struct ether_header *eh;
155 const u_char *lladdr;
157 if (req->rtype != IFENCAP_LL)
160 if (req->bufsize < ETHER_HDR_LEN)
163 eh = (struct ether_header *)req->buf;
164 lladdr = req->lladdr;
167 switch (req->family) {
169 etype = htons(ETHERTYPE_IP);
172 etype = htons(ETHERTYPE_IPV6);
175 ah = (struct arphdr *)req->hdata;
176 ah->ar_hrd = htons(ARPHRD_ETHER);
178 switch(ntohs(ah->ar_op)) {
179 case ARPOP_REVREQUEST:
181 etype = htons(ETHERTYPE_REVARP);
186 etype = htons(ETHERTYPE_ARP);
190 if (req->flags & IFENCAP_FLAG_BROADCAST)
191 lladdr = ifp->if_broadcastaddr;
194 return (EAFNOSUPPORT);
197 memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type));
198 memcpy(eh->ether_dhost, lladdr, ETHER_ADDR_LEN);
199 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
200 req->bufsize = sizeof(struct ether_header);
206 ether_resolve_addr(struct ifnet *ifp, struct mbuf *m,
207 const struct sockaddr *dst, struct route *ro, u_char *phdr,
208 uint32_t *pflags, struct llentry **plle)
210 uint32_t lleflags = 0;
212 #if defined(INET) || defined(INET6)
213 struct ether_header *eh = (struct ether_header *)phdr;
220 switch (dst->sa_family) {
223 if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
224 error = arpresolve(ifp, 0, m, dst, phdr, &lleflags,
227 if (m->m_flags & M_BCAST)
228 memcpy(eh->ether_dhost, ifp->if_broadcastaddr,
231 const struct in_addr *a;
232 a = &(((const struct sockaddr_in *)dst)->sin_addr);
233 ETHER_MAP_IP_MULTICAST(a, eh->ether_dhost);
235 etype = htons(ETHERTYPE_IP);
236 memcpy(&eh->ether_type, &etype, sizeof(etype));
237 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
243 if ((m->m_flags & M_MCAST) == 0) {
244 int af = RO_GET_FAMILY(ro, dst);
245 error = nd6_resolve(ifp, LLE_SF(af, 0), m, dst, phdr,
248 const struct in6_addr *a6;
249 a6 = &(((const struct sockaddr_in6 *)dst)->sin6_addr);
250 ETHER_MAP_IPV6_MULTICAST(a6, eh->ether_dhost);
251 etype = htons(ETHERTYPE_IPV6);
252 memcpy(&eh->ether_type, &etype, sizeof(etype));
253 memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
258 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
261 return (EAFNOSUPPORT);
264 if (error == EHOSTDOWN) {
265 if (ro != NULL && (ro->ro_flags & RT_HAS_GW) != 0)
266 error = EHOSTUNREACH;
272 *pflags = RT_MAY_LOOP;
273 if (lleflags & LLE_IFADDR)
280 * Ethernet output routine.
281 * Encapsulate a packet of type family for the local net.
282 * Use trailer local net encapsulation if enough data in first
283 * packet leaves a multiple of 512 bytes of data in remainder.
286 ether_output(struct ifnet *ifp, struct mbuf *m,
287 const struct sockaddr *dst, struct route *ro)
290 char linkhdr[ETHER_HDR_LEN], *phdr;
291 struct ether_header *eh;
294 int hlen; /* link layer header length */
296 struct llentry *lle = NULL;
302 /* XXX BPF uses ro_prepend */
303 if (ro->ro_prepend != NULL) {
304 phdr = ro->ro_prepend;
306 } else if (!(m->m_flags & (M_BCAST | M_MCAST))) {
307 if ((ro->ro_flags & RT_LLE_CACHE) != 0) {
310 (lle->la_flags & LLE_VALID) == 0) {
312 lle = NULL; /* redundant */
316 /* if we lookup, keep cache */
320 * Notify LLE code that
324 llentry_provide_feedback(lle);
327 phdr = lle->r_linkdata;
328 hlen = lle->r_hdrlen;
329 pflags = lle->r_flags;
335 error = mac_ifnet_check_transmit(ifp, m);
341 if (ifp->if_flags & IFF_MONITOR)
343 if (!((ifp->if_flags & IFF_UP) &&
344 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
348 /* No prepend data supplied. Try to calculate ourselves. */
350 hlen = ETHER_HDR_LEN;
351 error = ether_resolve_addr(ifp, m, dst, ro, phdr, &pflags,
352 addref ? &lle : NULL);
353 if (addref && lle != NULL)
356 return (error == EWOULDBLOCK ? 0 : error);
359 if ((pflags & RT_L2_ME) != 0) {
360 update_mbuf_csumflags(m, m);
361 return (if_simloop(ifp, m, RO_GET_FAMILY(ro, dst), 0));
363 loop_copy = (pflags & RT_MAY_LOOP) != 0;
366 * Add local net header. If no space in first mbuf,
369 * Note that we do prepend regardless of RT_HAS_HEADER flag.
370 * This is done because BPF code shifts m_data pointer
371 * to the end of ethernet header prior to calling if_output().
373 M_PREPEND(m, hlen, M_NOWAIT);
376 if ((pflags & RT_HAS_HEADER) == 0) {
377 eh = mtod(m, struct ether_header *);
378 memcpy(eh, phdr, hlen);
382 * If a simplex interface, and the packet is being sent to our
383 * Ethernet address or a broadcast address, loopback a copy.
384 * XXX To make a simplex device behave exactly like a duplex
385 * device, we should copy in the case of sending to our own
386 * ethernet address (thus letting the original actually appear
387 * on the wire). However, we don't do that here for security
388 * reasons and compatibility with the original behavior.
390 if ((m->m_flags & M_BCAST) && loop_copy && (ifp->if_flags & IFF_SIMPLEX) &&
391 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
395 * Because if_simloop() modifies the packet, we need a
396 * writable copy through m_dup() instead of a readonly
397 * one as m_copy[m] would give us. The alternative would
398 * be to modify if_simloop() to handle the readonly mbuf,
399 * but performancewise it is mostly equivalent (trading
400 * extra data copying vs. extra locking).
402 * XXX This is a local workaround. A number of less
403 * often used kernel parts suffer from the same bug.
404 * See PR kern/105943 for a proposed general solution.
406 if ((n = m_dup(m, M_NOWAIT)) != NULL) {
407 update_mbuf_csumflags(m, n);
408 (void)if_simloop(ifp, n, RO_GET_FAMILY(ro, dst), hlen);
410 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
414 * Bridges require special output handling.
416 if (ifp->if_bridge) {
417 BRIDGE_OUTPUT(ifp, m, error);
421 #if defined(INET) || defined(INET6)
423 (error = (*carp_output_p)(ifp, m, dst)))
427 /* Handle ng_ether(4) processing, if any */
428 if (ifp->if_l2com != NULL) {
429 KASSERT(ng_ether_output_p != NULL,
430 ("ng_ether_output_p is NULL"));
431 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
440 /* Continue with link-layer output */
441 return ether_output_frame(ifp, m);
445 ether_set_pcp(struct mbuf **mp, struct ifnet *ifp, uint8_t pcp)
447 struct ether_8021q_tag qtag;
448 struct ether_header *eh;
450 eh = mtod(*mp, struct ether_header *);
451 if (eh->ether_type == htons(ETHERTYPE_VLAN) ||
452 eh->ether_type == htons(ETHERTYPE_QINQ)) {
453 (*mp)->m_flags &= ~M_VLANTAG;
459 qtag.proto = ETHERTYPE_VLAN;
460 if (ether_8021q_frame(mp, ifp, ifp, &qtag))
462 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
467 * Ethernet link layer output routine to send a raw frame to the device.
469 * This assumes that the 14 byte Ethernet header is present and contiguous
470 * in the first mbuf (if BRIDGE'ing).
473 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
475 if (ether_do_pcp(ifp, m) && !ether_set_pcp(&m, ifp, ifp->if_pcp))
478 if (PFIL_HOOKED_OUT(V_link_pfil_head))
479 switch (pfil_mbuf_out(V_link_pfil_head, &m, ifp, NULL)) {
487 #if defined(INET6) && defined(INET)
488 /* draft-ietf-6man-ipv6only-flag */
489 /* Catch ETHERTYPE_IP, and ETHERTYPE_[REV]ARP if we are v6-only. */
490 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY_MASK) != 0) {
491 struct ether_header *eh;
493 eh = mtod(m, struct ether_header *);
494 switch (ntohs(eh->ether_type)) {
497 case ETHERTYPE_REVARP:
499 return (EAFNOSUPPORT);
508 * Queue message on interface, update output statistics if successful,
509 * and start output if interface not yet active.
511 * If KMSAN is enabled, use it to verify that the data does not contain
512 * any uninitialized bytes.
514 kmsan_check_mbuf(m, "ether_output");
515 return ((ifp->if_transmit)(ifp, m));
519 * Process a received Ethernet packet; the packet is in the
520 * mbuf chain m with the ethernet header at the front.
523 ether_input_internal(struct ifnet *ifp, struct mbuf *m)
525 struct ether_header *eh;
528 if ((ifp->if_flags & IFF_UP) == 0) {
533 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
534 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
539 if (m->m_len < ETHER_HDR_LEN) {
540 /* XXX maybe should pullup? */
541 if_printf(ifp, "discard frame w/o leading ethernet "
542 "header (len %u pkt len %u)\n",
543 m->m_len, m->m_pkthdr.len);
544 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
548 eh = mtod(m, struct ether_header *);
549 etype = ntohs(eh->ether_type);
550 random_harvest_queue_ether(m, sizeof(*m));
553 #if defined(INET6) && defined(INET)
554 /* draft-ietf-6man-ipv6only-flag */
555 /* Catch ETHERTYPE_IP, and ETHERTYPE_[REV]ARP if we are v6-only. */
556 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY_MASK) != 0) {
560 case ETHERTYPE_REVARP:
570 CURVNET_SET_QUIET(ifp->if_vnet);
572 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
573 if (ETHER_IS_BROADCAST(eh->ether_dhost))
574 m->m_flags |= M_BCAST;
576 m->m_flags |= M_MCAST;
577 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
582 * Tag the mbuf with an appropriate MAC label before any other
583 * consumers can get to it.
585 mac_ifnet_create_mbuf(ifp, m);
589 * Give bpf a chance at the packet.
591 ETHER_BPF_MTAP(ifp, m);
594 * If the CRC is still on the packet, trim it off. We do this once
595 * and once only in case we are re-entered. Nothing else on the
596 * Ethernet receive path expects to see the FCS.
598 if (m->m_flags & M_HASFCS) {
599 m_adj(m, -ETHER_CRC_LEN);
600 m->m_flags &= ~M_HASFCS;
603 if (!(ifp->if_capenable & IFCAP_HWSTATS))
604 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
606 /* Allow monitor mode to claim this frame, after stats are updated. */
607 if (ifp->if_flags & IFF_MONITOR) {
613 /* Handle input from a lagg(4) port */
614 if (ifp->if_type == IFT_IEEE8023ADLAG) {
615 KASSERT(lagg_input_ethernet_p != NULL,
616 ("%s: if_lagg not loaded!", __func__));
617 m = (*lagg_input_ethernet_p)(ifp, m);
619 ifp = m->m_pkthdr.rcvif;
627 * If the hardware did not process an 802.1Q tag, do this now,
628 * to allow 802.1P priority frames to be passed to the main input
631 if ((m->m_flags & M_VLANTAG) == 0 &&
632 ((etype == ETHERTYPE_VLAN) || (etype == ETHERTYPE_QINQ))) {
633 struct ether_vlan_header *evl;
635 if (m->m_len < sizeof(*evl) &&
636 (m = m_pullup(m, sizeof(*evl))) == NULL) {
638 if_printf(ifp, "cannot pullup VLAN header\n");
640 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
645 evl = mtod(m, struct ether_vlan_header *);
646 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
647 m->m_flags |= M_VLANTAG;
649 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
650 ETHER_HDR_LEN - ETHER_TYPE_LEN);
651 m_adj(m, ETHER_VLAN_ENCAP_LEN);
652 eh = mtod(m, struct ether_header *);
655 M_SETFIB(m, ifp->if_fib);
657 /* Allow ng_ether(4) to claim this frame. */
658 if (ifp->if_l2com != NULL) {
659 KASSERT(ng_ether_input_p != NULL,
660 ("%s: ng_ether_input_p is NULL", __func__));
661 m->m_flags &= ~M_PROMISC;
662 (*ng_ether_input_p)(ifp, &m);
667 eh = mtod(m, struct ether_header *);
671 * Allow if_bridge(4) to claim this frame.
673 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
674 * and the frame should be delivered locally.
676 * If M_BRIDGE_INJECT is set, the packet was received directly by the
677 * bridge via netmap, so "ifp" is the bridge itself and the packet
678 * should be re-examined.
680 if (ifp->if_bridge != NULL || (m->m_flags & M_BRIDGE_INJECT) != 0) {
681 m->m_flags &= ~M_PROMISC;
682 BRIDGE_INPUT(ifp, m);
687 eh = mtod(m, struct ether_header *);
690 #if defined(INET) || defined(INET6)
692 * Clear M_PROMISC on frame so that carp(4) will see it when the
693 * mbuf flows up to Layer 3.
694 * FreeBSD's implementation of carp(4) uses the inprotosw
695 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
696 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
697 * is outside the scope of the M_PROMISC test below.
698 * TODO: Maintain a hash table of ethernet addresses other than
699 * ether_dhost which may be active on this ifp.
701 if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
702 m->m_flags &= ~M_PROMISC;
707 * If the frame received was not for our MAC address, set the
708 * M_PROMISC flag on the mbuf chain. The frame may need to
709 * be seen by the rest of the Ethernet input path in case of
710 * re-entry (e.g. bridge, vlan, netgraph) but should not be
711 * seen by upper protocol layers.
713 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
714 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
715 m->m_flags |= M_PROMISC;
723 * Ethernet input dispatch; by default, direct dispatch here regardless of
724 * global configuration. However, if RSS is enabled, hook up RSS affinity
725 * so that when deferred or hybrid dispatch is enabled, we can redistribute
728 * XXXRW: Would be nice if the ifnet passed up a flag indicating whether or
729 * not it had already done work distribution via multi-queue. Then we could
730 * direct dispatch in the event load balancing was already complete and
731 * handle the case of interfaces with different capabilities better.
733 * XXXRW: Sort of want an M_DISTRIBUTED flag to avoid multiple distributions
734 * at multiple layers?
736 * XXXRW: For now, enable all this only if RSS is compiled in, although it
737 * works fine without RSS. Need to characterise the performance overhead
738 * of the detour through the netisr code in the event the result is always
742 ether_nh_input(struct mbuf *m)
746 KASSERT(m->m_pkthdr.rcvif != NULL,
747 ("%s: NULL interface pointer", __func__));
748 ether_input_internal(m->m_pkthdr.rcvif, m);
751 static struct netisr_handler ether_nh = {
753 .nh_handler = ether_nh_input,
754 .nh_proto = NETISR_ETHER,
756 .nh_policy = NETISR_POLICY_CPU,
757 .nh_dispatch = NETISR_DISPATCH_DIRECT,
758 .nh_m2cpuid = rss_m2cpuid,
760 .nh_policy = NETISR_POLICY_SOURCE,
761 .nh_dispatch = NETISR_DISPATCH_DIRECT,
766 ether_init(__unused void *arg)
769 netisr_register(ðer_nh);
771 SYSINIT(ether, SI_SUB_INIT_IF, SI_ORDER_ANY, ether_init, NULL);
774 vnet_ether_init(__unused void *arg)
776 struct pfil_head_args args;
778 args.pa_version = PFIL_VERSION;
779 args.pa_flags = PFIL_IN | PFIL_OUT;
780 args.pa_type = PFIL_TYPE_ETHERNET;
781 args.pa_headname = PFIL_ETHER_NAME;
782 V_link_pfil_head = pfil_head_register(&args);
785 netisr_register_vnet(ðer_nh);
788 VNET_SYSINIT(vnet_ether_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
789 vnet_ether_init, NULL);
793 vnet_ether_pfil_destroy(__unused void *arg)
796 pfil_head_unregister(V_link_pfil_head);
798 VNET_SYSUNINIT(vnet_ether_pfil_uninit, SI_SUB_PROTO_PFIL, SI_ORDER_ANY,
799 vnet_ether_pfil_destroy, NULL);
802 vnet_ether_destroy(__unused void *arg)
805 netisr_unregister_vnet(ðer_nh);
807 VNET_SYSUNINIT(vnet_ether_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
808 vnet_ether_destroy, NULL);
812 ether_input(struct ifnet *ifp, struct mbuf *m)
814 struct epoch_tracker et;
818 needs_epoch = (ifp->if_flags & IFF_NEEDSEPOCH);
821 * This temporary code is here to prevent epoch unaware and unmarked
822 * drivers to panic the system. Once all drivers are taken care of,
823 * the whole INVARIANTS block should go away.
825 if (!needs_epoch && !in_epoch(net_epoch_preempt)) {
826 static bool printedonce;
831 if_printf(ifp, "called %s w/o net epoch! "
832 "PLEASE file a bug report.", __func__);
841 * The drivers are allowed to pass in a chain of packets linked with
842 * m_nextpkt. We split them up into separate packets here and pass
843 * them up. This allows the drivers to amortize the receive lock.
845 CURVNET_SET_QUIET(ifp->if_vnet);
846 if (__predict_false(needs_epoch))
853 * We will rely on rcvif being set properly in the deferred
854 * context, so assert it is correct here.
856 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
857 KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch m %p "
858 "rcvif %p ifp %p", __func__, m, m->m_pkthdr.rcvif, ifp));
859 netisr_dispatch(NETISR_ETHER, m);
862 if (__predict_false(needs_epoch))
868 * Upper layer processing for a received Ethernet packet.
871 ether_demux(struct ifnet *ifp, struct mbuf *m)
873 struct ether_header *eh;
878 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
880 /* Do not grab PROMISC frames in case we are re-entered. */
881 if (PFIL_HOOKED_IN(V_link_pfil_head) && !(m->m_flags & M_PROMISC)) {
882 i = pfil_mbuf_in(V_link_pfil_head, &m, ifp, NULL);
883 if (i != 0 || m == NULL)
887 eh = mtod(m, struct ether_header *);
888 ether_type = ntohs(eh->ether_type);
891 * If this frame has a VLAN tag other than 0, call vlan_input()
892 * if its module is loaded. Otherwise, drop.
894 if ((m->m_flags & M_VLANTAG) &&
895 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
896 if (ifp->if_vlantrunk == NULL) {
897 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
901 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
903 /* Clear before possibly re-entering ether_input(). */
904 m->m_flags &= ~M_PROMISC;
905 (*vlan_input_p)(ifp, m);
910 * Pass promiscuously received frames to the upper layer if the user
911 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
913 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
919 * Reset layer specific mbuf flags to avoid confusing upper layers.
921 m->m_flags &= ~M_VLANTAG;
925 * Dispatch frame to upper layer.
927 switch (ether_type) {
934 if (ifp->if_flags & IFF_NOARP) {
935 /* Discard packet if ARP is disabled on interface */
951 /* Strip off Ethernet header. */
952 m_adj(m, ETHER_HDR_LEN);
954 netisr_dispatch(isr, m);
959 * Packet is to be discarded. If netgraph is present,
960 * hand the packet to it for last chance processing;
961 * otherwise dispose of it.
963 if (ifp->if_l2com != NULL) {
964 KASSERT(ng_ether_input_orphan_p != NULL,
965 ("ng_ether_input_orphan_p is NULL"));
966 (*ng_ether_input_orphan_p)(ifp, m);
973 * Convert Ethernet address to printable (loggable) representation.
974 * This routine is for compatibility; it's better to just use
976 * printf("%6D", <pointer to address>, ":");
978 * since there's no static buffer involved.
981 ether_sprintf(const u_char *ap)
983 static char etherbuf[18];
984 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
989 * Perform common duties while attaching to interface list
992 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
996 struct sockaddr_dl *sdl;
998 ifp->if_addrlen = ETHER_ADDR_LEN;
999 ifp->if_hdrlen = ETHER_HDR_LEN;
1000 ifp->if_mtu = ETHERMTU;
1002 ifp->if_output = ether_output;
1003 ifp->if_input = ether_input;
1004 ifp->if_resolvemulti = ether_resolvemulti;
1005 ifp->if_requestencap = ether_requestencap;
1007 ifp->if_reassign = ether_reassign;
1009 if (ifp->if_baudrate == 0)
1010 ifp->if_baudrate = IF_Mbps(10); /* just a default */
1011 ifp->if_broadcastaddr = etherbroadcastaddr;
1014 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
1015 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1016 sdl->sdl_type = IFT_ETHER;
1017 sdl->sdl_alen = ifp->if_addrlen;
1018 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
1020 if (ifp->if_hw_addr != NULL)
1021 bcopy(lla, ifp->if_hw_addr, ifp->if_addrlen);
1023 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
1024 if (ng_ether_attach_p != NULL)
1025 (*ng_ether_attach_p)(ifp);
1027 /* Announce Ethernet MAC address if non-zero. */
1028 for (i = 0; i < ifp->if_addrlen; i++)
1031 if (i != ifp->if_addrlen)
1032 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
1034 uuid_ether_add(LLADDR(sdl));
1036 /* Add necessary bits are setup; announce it now. */
1037 EVENTHANDLER_INVOKE(ether_ifattach_event, ifp);
1038 if (IS_DEFAULT_VNET(curvnet))
1039 devctl_notify("ETHERNET", ifp->if_xname, "IFATTACH", NULL);
1043 * Perform common duties while detaching an Ethernet interface
1046 ether_ifdetach(struct ifnet *ifp)
1048 struct sockaddr_dl *sdl;
1050 sdl = (struct sockaddr_dl *)(ifp->if_addr->ifa_addr);
1051 uuid_ether_del(LLADDR(sdl));
1053 if (ifp->if_l2com != NULL) {
1054 KASSERT(ng_ether_detach_p != NULL,
1055 ("ng_ether_detach_p is NULL"));
1056 (*ng_ether_detach_p)(ifp);
1065 ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
1068 if (ifp->if_l2com != NULL) {
1069 KASSERT(ng_ether_detach_p != NULL,
1070 ("ng_ether_detach_p is NULL"));
1071 (*ng_ether_detach_p)(ifp);
1074 if (ng_ether_attach_p != NULL) {
1075 CURVNET_SET_QUIET(new_vnet);
1076 (*ng_ether_attach_p)(ifp);
1082 SYSCTL_DECL(_net_link);
1083 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1088 * This is for reference. We have a table-driven version
1089 * of the little-endian crc32 generator, which is faster
1090 * than the double-loop.
1093 ether_crc32_le(const uint8_t *buf, size_t len)
1100 crc = 0xffffffff; /* initial value */
1102 for (i = 0; i < len; i++) {
1103 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1104 carry = (crc ^ data) & 1;
1107 crc = (crc ^ ETHER_CRC_POLY_LE);
1115 ether_crc32_le(const uint8_t *buf, size_t len)
1117 static const uint32_t crctab[] = {
1118 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1119 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1120 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1121 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1126 crc = 0xffffffff; /* initial value */
1128 for (i = 0; i < len; i++) {
1130 crc = (crc >> 4) ^ crctab[crc & 0xf];
1131 crc = (crc >> 4) ^ crctab[crc & 0xf];
1139 ether_crc32_be(const uint8_t *buf, size_t len)
1142 uint32_t crc, carry;
1146 crc = 0xffffffff; /* initial value */
1148 for (i = 0; i < len; i++) {
1149 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1150 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1153 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1161 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1163 struct ifaddr *ifa = (struct ifaddr *) data;
1164 struct ifreq *ifr = (struct ifreq *) data;
1169 ifp->if_flags |= IFF_UP;
1171 switch (ifa->ifa_addr->sa_family) {
1174 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1175 arp_ifinit(ifp, ifa);
1179 ifp->if_init(ifp->if_softc);
1185 bcopy(IF_LLADDR(ifp), &ifr->ifr_addr.sa_data[0],
1191 * Set the interface MTU.
1193 if (ifr->ifr_mtu > ETHERMTU) {
1196 ifp->if_mtu = ifr->ifr_mtu;
1201 error = priv_check(curthread, PRIV_NET_SETLANPCP);
1204 if (ifr->ifr_lan_pcp > 7 &&
1205 ifr->ifr_lan_pcp != IFNET_PCP_NONE) {
1208 ifp->if_pcp = ifr->ifr_lan_pcp;
1209 /* broadcast event about PCP change */
1210 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_PCP);
1215 ifr->ifr_lan_pcp = ifp->if_pcp;
1219 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1226 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1227 struct sockaddr *sa)
1229 struct sockaddr_dl *sdl;
1231 struct sockaddr_in *sin;
1234 struct sockaddr_in6 *sin6;
1238 switch(sa->sa_family) {
1241 * No mapping needed. Just check that it's a valid MC address.
1243 sdl = (struct sockaddr_dl *)sa;
1244 e_addr = LLADDR(sdl);
1245 if (!ETHER_IS_MULTICAST(e_addr))
1246 return EADDRNOTAVAIL;
1252 sin = (struct sockaddr_in *)sa;
1253 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1254 return EADDRNOTAVAIL;
1255 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
1256 sdl->sdl_alen = ETHER_ADDR_LEN;
1257 e_addr = LLADDR(sdl);
1258 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1259 *llsa = (struct sockaddr *)sdl;
1264 sin6 = (struct sockaddr_in6 *)sa;
1265 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1267 * An IP6 address of 0 means listen to all
1268 * of the Ethernet multicast address used for IP6.
1269 * (This is used for multicast routers.)
1271 ifp->if_flags |= IFF_ALLMULTI;
1275 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1276 return EADDRNOTAVAIL;
1277 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
1278 sdl->sdl_alen = ETHER_ADDR_LEN;
1279 e_addr = LLADDR(sdl);
1280 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1281 *llsa = (struct sockaddr *)sdl;
1287 * Well, the text isn't quite right, but it's the name
1290 return EAFNOSUPPORT;
1294 static moduledata_t ether_mod = {
1299 ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1301 struct ether_vlan_header vlan;
1304 KASSERT((m->m_flags & M_VLANTAG) != 0,
1305 ("%s: vlan information not present", __func__));
1306 KASSERT(m->m_len >= sizeof(struct ether_header),
1307 ("%s: mbuf not large enough for header", __func__));
1308 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1309 vlan.evl_proto = vlan.evl_encap_proto;
1310 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1311 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1312 m->m_len -= sizeof(struct ether_header);
1313 m->m_data += sizeof(struct ether_header);
1315 * If a data link has been supplied by the caller, then we will need to
1316 * re-create a stack allocated mbuf chain with the following structure:
1318 * (1) mbuf #1 will contain the supplied data link
1319 * (2) mbuf #2 will contain the vlan header
1320 * (3) mbuf #3 will contain the original mbuf's packet data
1322 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1326 mv.m_data = (caddr_t)&vlan;
1327 mv.m_len = sizeof(vlan);
1333 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1334 m->m_len += sizeof(struct ether_header);
1335 m->m_data -= sizeof(struct ether_header);
1339 ether_vlanencap_proto(struct mbuf *m, uint16_t tag, uint16_t proto)
1341 struct ether_vlan_header *evl;
1343 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
1346 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1348 if (m->m_len < sizeof(*evl)) {
1349 m = m_pullup(m, sizeof(*evl));
1355 * Transform the Ethernet header into an Ethernet header
1356 * with 802.1Q encapsulation.
1358 evl = mtod(m, struct ether_vlan_header *);
1359 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1360 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1361 evl->evl_encap_proto = htons(proto);
1362 evl->evl_tag = htons(tag);
1367 ether_bpf_mtap_if(struct ifnet *ifp, struct mbuf *m)
1369 if (bpf_peers_present(ifp->if_bpf)) {
1371 if ((m->m_flags & M_VLANTAG) != 0)
1372 ether_vlan_mtap(ifp->if_bpf, m, NULL, 0);
1374 bpf_mtap(ifp->if_bpf, m);
1378 static SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1379 "IEEE 802.1Q VLAN");
1380 static SYSCTL_NODE(_net_link_vlan, PF_LINK, link,
1381 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
1384 VNET_DEFINE_STATIC(int, soft_pad);
1385 #define V_soft_pad VNET(soft_pad)
1386 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW | CTLFLAG_VNET,
1387 &VNET_NAME(soft_pad), 0,
1388 "pad short frames before tagging");
1391 * For now, make preserving PCP via an mbuf tag optional, as it increases
1392 * per-packet memory allocations and frees. In the future, it would be
1393 * preferable to reuse ether_vtag for this, or similar.
1395 VNET_DEFINE(int, vlan_mtag_pcp) = 0;
1396 #define V_vlan_mtag_pcp VNET(vlan_mtag_pcp)
1397 SYSCTL_INT(_net_link_vlan, OID_AUTO, mtag_pcp, CTLFLAG_RW | CTLFLAG_VNET,
1398 &VNET_NAME(vlan_mtag_pcp), 0,
1399 "Retain VLAN PCP information as packets are passed up the stack");
1402 ether_do_pcp(struct ifnet *ifp, struct mbuf *m)
1404 if (ifp->if_type == IFT_L2VLAN)
1406 if (ifp->if_pcp != IFNET_PCP_NONE || (m->m_flags & M_VLANTAG) != 0)
1408 if (V_vlan_mtag_pcp &&
1409 m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL) != NULL)
1415 ether_8021q_frame(struct mbuf **mp, struct ifnet *ife, struct ifnet *p,
1416 const struct ether_8021q_tag *qtag)
1421 uint8_t pcp = qtag->pcp;
1422 static const char pad[8]; /* just zeros */
1425 * Pad the frame to the minimum size allowed if told to.
1426 * This option is in accord with IEEE Std 802.1Q, 2003 Ed.,
1427 * paragraph C.4.4.3.b. It can help to work around buggy
1428 * bridges that violate paragraph C.4.4.3.a from the same
1429 * document, i.e., fail to pad short frames after untagging.
1430 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but
1431 * untagging it will produce a 62-byte frame, which is a runt
1432 * and requires padding. There are VLAN-enabled network
1433 * devices that just discard such runts instead or mishandle
1436 if (V_soft_pad && p->if_type == IFT_ETHER) {
1437 for (n = ETHERMIN + ETHER_HDR_LEN - (*mp)->m_pkthdr.len;
1438 n > 0; n -= sizeof(pad)) {
1439 if (!m_append(*mp, min(n, sizeof(pad)), pad))
1445 if_printf(ife, "cannot pad short frame");
1451 * If PCP is set in mbuf, use it
1453 if ((*mp)->m_flags & M_VLANTAG) {
1454 pcp = EVL_PRIOFTAG((*mp)->m_pkthdr.ether_vtag);
1458 * If underlying interface can do VLAN tag insertion itself,
1459 * just pass the packet along. However, we need some way to
1460 * tell the interface where the packet came from so that it
1461 * knows how to find the VLAN tag to use, so we attach a
1462 * packet tag that holds it.
1464 if (V_vlan_mtag_pcp && (mtag = m_tag_locate(*mp, MTAG_8021Q,
1465 MTAG_8021Q_PCP_OUT, NULL)) != NULL)
1466 tag = EVL_MAKETAG(qtag->vid, *(uint8_t *)(mtag + 1), 0);
1468 tag = EVL_MAKETAG(qtag->vid, pcp, 0);
1469 if ((p->if_capenable & IFCAP_VLAN_HWTAGGING) &&
1470 (qtag->proto == ETHERTYPE_VLAN)) {
1471 (*mp)->m_pkthdr.ether_vtag = tag;
1472 (*mp)->m_flags |= M_VLANTAG;
1474 *mp = ether_vlanencap_proto(*mp, tag, qtag->proto);
1476 if_printf(ife, "unable to prepend 802.1Q header");
1479 (*mp)->m_flags &= ~M_VLANTAG;
1485 * Allocate an address from the FreeBSD Foundation OUI. This uses a
1486 * cryptographic hash function on the containing jail's name, UUID and the
1487 * interface name to attempt to provide a unique but stable address.
1488 * Pseudo-interfaces which require a MAC address should use this function to
1489 * allocate non-locally-administered addresses.
1492 ether_gen_addr(struct ifnet *ifp, struct ether_addr *hwaddr)
1496 char uuid[HOSTUUIDLEN + 1];
1499 char digest[SHA1_RESULTLEN];
1500 char jailname[MAXHOSTNAMELEN];
1502 getcredhostuuid(curthread->td_ucred, uuid, sizeof(uuid));
1503 if (strncmp(uuid, DEFAULT_HOSTUUID, sizeof(uuid)) == 0) {
1504 /* Fall back to a random mac address. */
1508 /* If each (vnet) jail would also have a unique hostuuid this would not
1510 getjailname(curthread->td_ucred, jailname, sizeof(jailname));
1511 sz = asprintf(&buf, M_TEMP, "%s-%s-%s", uuid, if_name(ifp),
1514 /* Fall back to a random mac address. */
1519 SHA1Update(&ctx, buf, sz);
1520 SHA1Final(digest, &ctx);
1523 addr = ((digest[0] << 16) | (digest[1] << 8) | digest[2]) &
1524 OUI_FREEBSD_GENERATED_MASK;
1525 addr = OUI_FREEBSD(addr);
1526 for (i = 0; i < ETHER_ADDR_LEN; ++i) {
1527 hwaddr->octet[i] = addr >> ((ETHER_ADDR_LEN - i - 1) * 8) &
1533 arc4rand(hwaddr, sizeof(*hwaddr), 0);
1535 hwaddr->octet[0] &= 0xFE;
1536 /* Locally administered. */
1537 hwaddr->octet[0] |= 0x02;
1540 DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1541 MODULE_VERSION(ether, 1);