2 * Copyright (c) 1982, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.33 2003/04/28 15:45:53 archie Exp $
35 * $DragonFly: src/sys/net/if_ethersubr.c,v 1.93 2008/09/24 11:14:43 sephe Exp $
38 #include "opt_atalk.h"
40 #include "opt_inet6.h"
43 #include "opt_netgraph.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/globaldata.h>
49 #include <sys/kernel.h>
52 #include <sys/malloc.h>
54 #include <sys/msgport.h>
55 #include <sys/socket.h>
56 #include <sys/sockio.h>
57 #include <sys/sysctl.h>
58 #include <sys/thread.h>
59 #include <sys/thread2.h>
62 #include <net/netisr.h>
63 #include <net/route.h>
64 #include <net/if_llc.h>
65 #include <net/if_dl.h>
66 #include <net/if_types.h>
67 #include <net/ifq_var.h>
69 #include <net/ethernet.h>
70 #include <net/vlan/if_vlan_ether.h>
71 #include <net/netmsg2.h>
73 #if defined(INET) || defined(INET6)
74 #include <netinet/in.h>
75 #include <netinet/in_var.h>
76 #include <netinet/if_ether.h>
77 #include <net/ipfw/ip_fw.h>
78 #include <net/dummynet/ip_dummynet.h>
81 #include <netinet6/nd6.h>
85 #include <netinet/ip_carp.h>
89 #include <netproto/ipx/ipx.h>
90 #include <netproto/ipx/ipx_if.h>
91 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m);
92 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst,
93 short *tp, int *hlen);
98 #include <netns/ns_if.h>
100 int ether_outputdebug = 0;
101 int ether_inputdebug = 0;
105 #include <netproto/atalk/at.h>
106 #include <netproto/atalk/at_var.h>
107 #include <netproto/atalk/at_extern.h>
109 #define llc_snap_org_code llc_un.type_snap.org_code
110 #define llc_snap_ether_type llc_un.type_snap.ether_type
112 extern u_char at_org_code[3];
113 extern u_char aarp_org_code[3];
114 #endif /* NETATALK */
117 #include <netproto/mpls/mpls.h>
120 /* netgraph node hooks for ng_ether(4) */
121 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
122 void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
123 struct mbuf *m, const struct ether_header *eh);
124 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
125 void (*ng_ether_attach_p)(struct ifnet *ifp);
126 void (*ng_ether_detach_p)(struct ifnet *ifp);
128 void (*vlan_input_p)(struct mbuf *);
130 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *,
132 static void ether_restore_header(struct mbuf **, const struct ether_header *,
133 const struct ether_header *);
138 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
139 int (*bridge_output_p)(struct ifnet *, struct mbuf *);
140 void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
142 static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
145 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
146 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
149 #define gotoerr(e) do { error = (e); goto bad; } while (0)
150 #define IFP2AC(ifp) ((struct arpcom *)(ifp))
152 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
154 const struct ether_header *eh);
156 static int ether_ipfw;
157 static u_int ether_restore_hdr;
158 static u_int ether_prepend_hdr;
160 SYSCTL_DECL(_net_link);
161 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
162 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
163 ðer_ipfw, 0, "Pass ether pkts through firewall");
164 SYSCTL_UINT(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW,
165 ðer_restore_hdr, 0, "# of ether header restoration");
166 SYSCTL_UINT(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW,
167 ðer_prepend_hdr, 0,
168 "# of ether header restoration which prepends mbuf");
170 #define ETHER_KTR_STR "ifp=%p"
171 #define ETHER_KTR_ARG_SIZE (sizeof(void *))
173 #define KTR_ETHERNET KTR_ALL
175 KTR_INFO_MASTER(ether);
176 KTR_INFO(KTR_ETHERNET, ether, chain_beg, 0, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE);
177 KTR_INFO(KTR_ETHERNET, ether, chain_end, 1, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE);
178 KTR_INFO(KTR_ETHERNET, ether, disp_beg, 2, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE);
179 KTR_INFO(KTR_ETHERNET, ether, disp_end, 3, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE);
180 #define logether(name, arg) KTR_LOG(ether_ ## name, arg)
183 * Ethernet output routine.
184 * Encapsulate a packet of type family for the local net.
185 * Use trailer local net encapsulation if enough data in first
186 * packet leaves a multiple of 512 bytes of data in remainder.
187 * Assumes that ifp is actually pointer to arpcom structure.
190 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
193 struct ether_header *eh, *deh;
196 int hlen = ETHER_HDR_LEN; /* link layer header length */
197 struct arpcom *ac = IFP2AC(ifp);
200 ASSERT_NOT_SERIALIZED(ifp->if_serializer);
202 if (ifp->if_flags & IFF_MONITOR)
204 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
207 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT);
210 eh = mtod(m, struct ether_header *);
211 edst = eh->ether_dhost;
214 * Fill in the destination ethernet address and frame type.
216 switch (dst->sa_family) {
219 if (!arpresolve(ifp, rt, m, dst, edst))
220 return (0); /* if not yet resolved */
222 if (m->m_flags & M_MPLSLABELED)
223 eh->ether_type = htons(ETHERTYPE_MPLS);
226 eh->ether_type = htons(ETHERTYPE_IP);
231 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst))
232 return (0); /* Something bad happenned. */
233 eh->ether_type = htons(ETHERTYPE_IPV6);
238 if (ef_outputp != NULL) {
239 error = ef_outputp(ifp, &m, dst, &eh->ether_type,
244 eh->ether_type = htons(ETHERTYPE_IPX);
245 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
246 edst, ETHER_ADDR_LEN);
252 struct at_ifaddr *aa;
254 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
259 * In the phase 2 case, need to prepend an mbuf for
260 * the llc header. Since we must preserve the value
261 * of m, which is passed to us by value, we m_copy()
262 * the first mbuf, and use it for our llc header.
264 if (aa->aa_flags & AFA_PHASE2) {
267 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT);
268 eh = mtod(m, struct ether_header *);
269 edst = eh->ether_dhost;
270 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
271 llc.llc_control = LLC_UI;
272 bcopy(at_org_code, llc.llc_snap_org_code,
274 llc.llc_snap_ether_type = htons(ETHERTYPE_AT);
276 mtod(m, caddr_t) + sizeof(struct ether_header),
278 eh->ether_type = htons(m->m_pkthdr.len);
279 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
281 eh->ether_type = htons(ETHERTYPE_AT);
283 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
292 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
293 eh->ether_type = 0x8137;
295 case 0x0: /* Novell 802.3 */
296 eh->ether_type = htons(m->m_pkthdr.len);
298 case 0xe0e0: /* Novell 802.2 and Token-Ring */
299 M_PREPEND(m, 3, MB_DONTWAIT);
300 eh = mtod(m, struct ether_header *);
301 edst = eh->ether_dhost;
302 eh->ether_type = htons(m->m_pkthdr.len);
303 cp = mtod(m, u_char *) + sizeof(struct ether_header);
309 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst,
312 * XXX if ns_thishost is the same as the node's ethernet
313 * address then just the default code will catch this anyhow.
314 * So I'm not sure if this next clause should be here at all?
317 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) {
318 m->m_pkthdr.rcvif = ifp;
319 netisr_dispatch(NETISR_NS, m);
322 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0)
323 m->m_flags |= M_BCAST;
326 case pseudo_AF_HDRCMPLT:
328 loop_copy = -1; /* if this is for us, don't do it */
329 deh = (struct ether_header *)dst->sa_data;
330 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN);
331 eh->ether_type = deh->ether_type;
335 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
336 gotoerr(EAFNOSUPPORT);
339 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */
340 memcpy(eh->ether_shost,
341 ((struct ether_header *)dst->sa_data)->ether_shost,
344 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN);
347 * Bridges require special output handling.
349 if (ifp->if_bridge) {
350 KASSERT(bridge_output_p != NULL,
351 ("%s: if_bridge not loaded!", __func__));
352 return bridge_output_p(ifp, m);
356 * If a simplex interface, and the packet is being sent to our
357 * Ethernet address or a broadcast address, loopback a copy.
358 * XXX To make a simplex device behave exactly like a duplex
359 * device, we should copy in the case of sending to our own
360 * ethernet address (thus letting the original actually appear
361 * on the wire). However, we don't do that here for security
362 * reasons and compatibility with the original behavior.
364 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
367 if (m->m_pkthdr.csum_flags & CSUM_IP)
368 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
369 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
370 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
371 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
374 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) {
375 n->m_pkthdr.csum_flags |= csum_flags;
376 if (csum_flags & CSUM_DATA_VALID)
377 n->m_pkthdr.csum_data = 0xffff;
378 if_simloop(ifp, n, dst->sa_family, hlen);
381 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
382 ETHER_ADDR_LEN) == 0) {
383 m->m_pkthdr.csum_flags |= csum_flags;
384 if (csum_flags & CSUM_DATA_VALID)
385 m->m_pkthdr.csum_data = 0xffff;
386 if_simloop(ifp, m, dst->sa_family, hlen);
387 return (0); /* XXX */
392 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL)))
397 /* Handle ng_ether(4) processing, if any */
398 if (ng_ether_output_p != NULL) {
399 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0)
405 /* Continue with link-layer output */
406 return ether_output_frame(ifp, m);
414 * Ethernet link layer output routine to send a raw frame to the device.
416 * This assumes that the 14 byte Ethernet header is present and contiguous
420 ether_output_frame(struct ifnet *ifp, struct mbuf *m)
422 struct ip_fw *rule = NULL;
424 struct altq_pktattr pktattr;
426 ASSERT_NOT_SERIALIZED(ifp->if_serializer);
428 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
431 /* Extract info from dummynet tag */
432 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
433 KKASSERT(mtag != NULL);
434 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
435 KKASSERT(rule != NULL);
437 m_tag_delete(m, mtag);
438 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
441 if (ifq_is_enabled(&ifp->if_snd))
442 altq_etherclassify(&ifp->if_snd, m, &pktattr);
444 if (IPFW_LOADED && ether_ipfw != 0) {
445 struct ether_header save_eh, *eh;
447 eh = mtod(m, struct ether_header *);
449 m_adj(m, ETHER_HDR_LEN);
450 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) {
454 return ENOBUFS; /* pkt dropped */
456 return 0; /* consumed e.g. in a pipe */
459 /* packet was ok, restore the ethernet header */
460 ether_restore_header(&m, eh, &save_eh);
469 * Queue message on interface, update output statistics if
470 * successful, and start output if interface not yet active.
472 error = ifq_dispatch(ifp, m, &pktattr);
477 * ipfw processing for ethernet packets (in and out).
478 * The second parameter is NULL from ether_demux(), and ifp from
479 * ether_output_frame().
482 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule,
483 const struct ether_header *eh)
485 struct ether_header save_eh = *eh; /* might be a ptr in *m0 */
486 struct ip_fw_args args;
491 if (*rule != NULL && fw_one_pass)
492 return TRUE; /* dummynet packet, already partially processed */
495 * I need some amount of data to be contiguous.
497 i = min((*m0)->m_pkthdr.len, max_protohdr);
498 if ((*m0)->m_len < i) {
499 *m0 = m_pullup(*m0, i);
507 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
508 m_tag_delete(*m0, mtag);
509 if ((*m0)->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
510 mtag = m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL);
511 KKASSERT(mtag != NULL);
512 m_tag_delete(*m0, mtag);
513 (*m0)->m_pkthdr.fw_flags &= ~IPFORWARD_MBUF_TAGGED;
516 args.m = *m0; /* the packet we are looking at */
517 args.oif = dst; /* destination, if any */
518 args.rule = *rule; /* matching rule to restart */
519 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
520 i = ip_fw_chk_ptr(&args);
535 * XXX at some point add support for divert/forward actions.
536 * If none of the above matches, we have to drop the pkt.
542 * Pass the pkt to dummynet, which consumes it.
544 m = *m0; /* pass the original to dummynet */
545 *m0 = NULL; /* and nothing back to the caller */
547 ether_restore_header(&m, eh, &save_eh);
551 ip_fw_dn_io_ptr(m, args.cookie,
552 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
557 panic("unknown ipfw return value: %d\n", i);
562 ether_input(struct ifnet *ifp, struct mbuf *m)
564 ether_input_chain(ifp, m, NULL);
568 * Perform common duties while attaching to interface list
571 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer)
573 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header),
578 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen,
579 lwkt_serialize_t serializer)
581 struct sockaddr_dl *sdl;
583 ifp->if_type = IFT_ETHER;
584 ifp->if_addrlen = ETHER_ADDR_LEN;
585 ifp->if_hdrlen = ETHER_HDR_LEN;
586 if_attach(ifp, serializer);
587 ifp->if_mtu = ETHERMTU;
588 if (ifp->if_baudrate == 0)
589 ifp->if_baudrate = 10000000;
590 ifp->if_output = ether_output;
591 ifp->if_input = ether_input;
592 ifp->if_resolvemulti = ether_resolvemulti;
593 ifp->if_broadcastaddr = etherbroadcastaddr;
594 sdl = IF_LLSOCKADDR(ifp);
595 sdl->sdl_type = IFT_ETHER;
596 sdl->sdl_alen = ifp->if_addrlen;
597 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
599 * XXX Keep the current drivers happy.
600 * XXX Remove once all drivers have been cleaned up
602 if (lla != IFP2AC(ifp)->ac_enaddr)
603 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
604 bpfattach(ifp, dlt, hdrlen);
605 if (ng_ether_attach_p != NULL)
606 (*ng_ether_attach_p)(ifp);
608 if_printf(ifp, "MAC address: %6D\n", lla, ":");
612 * Perform common duties while detaching an Ethernet interface
615 ether_ifdetach(struct ifnet *ifp)
619 if (ng_ether_detach_p != NULL)
620 (*ng_ether_detach_p)(ifp);
626 ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
628 struct ifaddr *ifa = (struct ifaddr *) data;
629 struct ifreq *ifr = (struct ifreq *) data;
632 #define IF_INIT(ifp) \
634 if (((ifp)->if_flags & IFF_UP) == 0) { \
635 (ifp)->if_flags |= IFF_UP; \
636 (ifp)->if_init((ifp)->if_softc); \
640 ASSERT_SERIALIZED(ifp->if_serializer);
644 switch (ifa->ifa_addr->sa_family) {
647 IF_INIT(ifp); /* before arpwhohas */
648 arp_ifinit(ifp, ifa);
653 * XXX - This code is probably wrong
657 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr;
658 struct arpcom *ac = IFP2AC(ifp);
660 if (ipx_nullhost(*ina))
661 ina->x_host = *(union ipx_host *) ac->ac_enaddr;
663 bcopy(ina->x_host.c_host, ac->ac_enaddr,
664 sizeof ac->ac_enaddr);
666 IF_INIT(ifp); /* Set new address. */
672 * XXX - This code is probably wrong
676 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
677 struct arpcom *ac = IFP2AC(ifp);
679 if (ns_nullhost(*ina))
680 ina->x_host = *(union ns_host *)(ac->ac_enaddr);
682 bcopy(ina->x_host.c_host, ac->ac_enaddr,
683 sizeof ac->ac_enaddr);
699 bcopy(IFP2AC(ifp)->ac_enaddr,
700 ((struct sockaddr *)ifr->ifr_data)->sa_data,
706 * Set the interface MTU.
708 if (ifr->ifr_mtu > ETHERMTU) {
711 ifp->if_mtu = ifr->ifr_mtu;
726 struct sockaddr **llsa,
729 struct sockaddr_dl *sdl;
730 struct sockaddr_in *sin;
732 struct sockaddr_in6 *sin6;
736 switch(sa->sa_family) {
739 * No mapping needed. Just check that it's a valid MC address.
741 sdl = (struct sockaddr_dl *)sa;
742 e_addr = LLADDR(sdl);
743 if ((e_addr[0] & 1) != 1)
744 return EADDRNOTAVAIL;
750 sin = (struct sockaddr_in *)sa;
751 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
752 return EADDRNOTAVAIL;
753 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
755 sdl->sdl_len = sizeof *sdl;
756 sdl->sdl_family = AF_LINK;
757 sdl->sdl_index = ifp->if_index;
758 sdl->sdl_type = IFT_ETHER;
759 sdl->sdl_alen = ETHER_ADDR_LEN;
760 e_addr = LLADDR(sdl);
761 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
762 *llsa = (struct sockaddr *)sdl;
767 sin6 = (struct sockaddr_in6 *)sa;
768 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
770 * An IP6 address of 0 means listen to all
771 * of the Ethernet multicast address used for IP6.
772 * (This is used for multicast routers.)
774 ifp->if_flags |= IFF_ALLMULTI;
778 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
779 return EADDRNOTAVAIL;
780 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
782 sdl->sdl_len = sizeof *sdl;
783 sdl->sdl_family = AF_LINK;
784 sdl->sdl_index = ifp->if_index;
785 sdl->sdl_type = IFT_ETHER;
786 sdl->sdl_alen = ETHER_ADDR_LEN;
787 e_addr = LLADDR(sdl);
788 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
789 *llsa = (struct sockaddr *)sdl;
795 * Well, the text isn't quite right, but it's the name
804 * This is for reference. We have a table-driven version
805 * of the little-endian crc32 generator, which is faster
806 * than the double-loop.
809 ether_crc32_le(const uint8_t *buf, size_t len)
811 uint32_t c, crc, carry;
814 crc = 0xffffffffU; /* initial value */
816 for (i = 0; i < len; i++) {
818 for (j = 0; j < 8; j++) {
819 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
823 crc = (crc ^ ETHER_CRC_POLY_LE);
831 ether_crc32_le(const uint8_t *buf, size_t len)
833 static const uint32_t crctab[] = {
834 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
835 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
836 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
837 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
842 crc = 0xffffffffU; /* initial value */
844 for (i = 0; i < len; i++) {
846 crc = (crc >> 4) ^ crctab[crc & 0xf];
847 crc = (crc >> 4) ^ crctab[crc & 0xf];
855 ether_crc32_be(const uint8_t *buf, size_t len)
857 uint32_t c, crc, carry;
860 crc = 0xffffffffU; /* initial value */
862 for (i = 0; i < len; i++) {
864 for (j = 0; j < 8; j++) {
865 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
869 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
877 * find the size of ethernet header, and call classifier
880 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
881 struct altq_pktattr *pktattr)
883 struct ether_header *eh;
885 int hlen, af, hdrsize;
888 hlen = sizeof(struct ether_header);
889 eh = mtod(m, struct ether_header *);
891 ether_type = ntohs(eh->ether_type);
892 if (ether_type < ETHERMTU) {
894 struct llc *llc = (struct llc *)(eh + 1);
897 if (m->m_len < hlen ||
898 llc->llc_dsap != LLC_SNAP_LSAP ||
899 llc->llc_ssap != LLC_SNAP_LSAP ||
900 llc->llc_control != LLC_UI)
901 goto bad; /* not snap! */
903 ether_type = ntohs(llc->llc_un.type_snap.ether_type);
906 if (ether_type == ETHERTYPE_IP) {
908 hdrsize = 20; /* sizeof(struct ip) */
910 } else if (ether_type == ETHERTYPE_IPV6) {
912 hdrsize = 40; /* sizeof(struct ip6_hdr) */
917 while (m->m_len <= hlen) {
921 hdr = m->m_data + hlen;
922 if (m->m_len < hlen + hdrsize) {
924 * ip header is not in a single mbuf. this should not
925 * happen in the current code.
926 * (todo: use m_pulldown in the future)
932 ifq_classify(ifq, m, af, pktattr);
939 pktattr->pattr_class = NULL;
940 pktattr->pattr_hdr = NULL;
941 pktattr->pattr_af = AF_UNSPEC;
945 ether_restore_header(struct mbuf **m0, const struct ether_header *eh,
946 const struct ether_header *save_eh)
948 struct mbuf *m = *m0;
953 * Prepend the header, optimize for the common case of
954 * eh pointing into the mbuf.
956 if ((const void *)(eh + 1) == (void *)m->m_data) {
957 m->m_data -= ETHER_HDR_LEN;
958 m->m_len += ETHER_HDR_LEN;
959 m->m_pkthdr.len += ETHER_HDR_LEN;
963 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
965 bcopy(save_eh, mtod(m, struct ether_header *),
973 ether_input_ipifunc(void *arg)
975 struct mbuf *m, *next;
983 port = m->m_pkthdr.header;
984 m->m_pkthdr.header = NULL;
987 &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg);
994 ether_input_dispatch(struct mbuf_chain *chain)
999 logether(disp_beg, NULL);
1000 for (i = 0; i < ncpus; ++i) {
1001 if (chain[i].mc_head != NULL) {
1002 lwkt_send_ipiq(globaldata_find(i),
1003 ether_input_ipifunc, chain[i].mc_head);
1007 logether(disp_beg, NULL);
1008 if (chain->mc_head != NULL)
1009 ether_input_ipifunc(chain->mc_head);
1011 logether(disp_end, NULL);
1015 ether_input_chain_init(struct mbuf_chain *chain)
1020 for (i = 0; i < ncpus; ++i)
1021 chain[i].mc_head = chain[i].mc_tail = NULL;
1023 chain->mc_head = chain->mc_tail = NULL;
1028 * Upper layer processing for a received Ethernet packet.
1031 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m)
1033 struct ether_header *eh;
1034 int isr, redispatch;
1036 struct ip_fw *rule = NULL;
1042 KASSERT(m->m_len >= ETHER_HDR_LEN,
1043 ("ether header is no contiguous!\n"));
1045 eh = mtod(m, struct ether_header *);
1047 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
1050 /* Extract info from dummynet tag */
1051 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
1052 KKASSERT(mtag != NULL);
1053 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
1054 KKASSERT(rule != NULL);
1056 m_tag_delete(m, mtag);
1057 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
1059 /* packet is passing the second time */
1065 * XXX: Okay, we need to call carp_forus() and - if it is for
1066 * us jump over code that does the normal check
1067 * "ac_enaddr == ether_dhost". The check sequence is a bit
1068 * different from OpenBSD, so we jump over as few code as
1069 * possible, to catch _all_ sanity checks. This needs
1070 * evaluation, to see if the carp ether_dhost values break any
1075 * Hold BGL and recheck ifp->if_carp
1078 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) {
1087 * Discard packet if upper layers shouldn't see it because
1088 * it was unicast to a different Ethernet address. If the
1089 * driver is working properly, then this situation can only
1090 * happen when the interface is in promiscuous mode.
1092 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
1093 (eh->ether_dhost[0] & 1) == 0 &&
1094 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
1100 if (IPFW_LOADED && ether_ipfw != 0) {
1101 struct ether_header save_eh = *eh;
1103 /* XXX old crufty stuff, needs to be removed */
1104 m_adj(m, sizeof(struct ether_header));
1106 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) {
1111 ether_restore_header(&m, eh, &save_eh);
1114 eh = mtod(m, struct ether_header *);
1117 ether_type = ntohs(eh->ether_type);
1118 KKASSERT(ether_type != ETHERTYPE_VLAN);
1120 if (m->m_flags & M_VLANTAG) {
1121 void (*vlan_input_func)(struct mbuf *);
1123 vlan_input_func = vlan_input_p;
1124 if (vlan_input_func != NULL) {
1127 m->m_pkthdr.rcvif->if_noproto++;
1133 m_adj(m, sizeof(struct ether_header));
1136 switch (ether_type) {
1139 if (ipflow_fastforward(m))
1145 if (ifp->if_flags & IFF_NOARP) {
1146 /* Discard packet if ARP is disabled on interface */
1155 case ETHERTYPE_IPV6:
1164 * Hold BGL and recheck ef_inputp
1167 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) {
1178 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
1186 isr = NETISR_ATALK1;
1188 case ETHERTYPE_AARP:
1194 case ETHERTYPE_MPLS:
1195 case ETHERTYPE_MPLS_MCAST:
1196 /* Should have been set by ether_input_chain(). */
1197 KKASSERT(m->m_flags & M_MPLSLABELED);
1204 * The accurate msgport is not determined before
1205 * we reach here, so redo the dispatching
1211 * Hold BGL and recheck ef_inputp
1214 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) {
1222 checksum = mtod(m, ushort *);
1224 if ((ether_type <= ETHERMTU) &&
1225 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
1226 if (*checksum == 0xE0E0) {
1227 m->m_pkthdr.len -= 3;
1236 if (ether_type > ETHERMTU)
1238 l = mtod(m, struct llc *);
1239 if (l->llc_dsap == LLC_SNAP_LSAP &&
1240 l->llc_ssap == LLC_SNAP_LSAP &&
1241 l->llc_control == LLC_UI) {
1242 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
1243 sizeof at_org_code) == 0 &&
1244 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
1245 m_adj(m, sizeof(struct llc));
1246 isr = NETISR_ATALK2;
1249 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
1250 sizeof aarp_org_code) == 0 &&
1251 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
1252 m_adj(m, sizeof(struct llc));
1259 if (ng_ether_input_orphan_p != NULL) {
1261 * Hold BGL and recheck ng_ether_input_orphan_p
1264 if (ng_ether_input_orphan_p != NULL) {
1265 ng_ether_input_orphan_p(ifp, m, eh);
1278 netisr_dispatch(isr, m);
1282 * First we perform any link layer operations, then continue to the
1283 * upper layers with ether_demux_oncpu().
1286 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m)
1288 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) {
1290 * Receiving interface's flags are changed, when this
1291 * packet is waiting for processing; discard it.
1298 * Tap the packet off here for a bridge. bridge_input()
1299 * will return NULL if it has consumed the packet, otherwise
1300 * it gets processed as normal. Note that bridge_input()
1301 * will always return the original packet if we need to
1302 * process it locally.
1304 if (ifp->if_bridge) {
1305 KASSERT(bridge_input_p != NULL,
1306 ("%s: if_bridge not loaded!", __func__));
1308 if(m->m_flags & M_PROTO1) {
1309 m->m_flags &= ~M_PROTO1;
1311 /* clear M_PROMISC, in case the packets comes from a vlan */
1312 /* m->m_flags &= ~M_PROMISC; */
1313 m = bridge_input_p(ifp, m);
1317 KASSERT(ifp == m->m_pkthdr.rcvif,
1318 ("bridge_input_p changed rcvif\n"));
1322 /* Handle ng_ether(4) processing, if any */
1323 if (ng_ether_input_p != NULL) {
1325 * Hold BGL and recheck ng_ether_input_p
1328 if (ng_ether_input_p != NULL)
1329 ng_ether_input_p(ifp, &m);
1336 /* Continue with upper layer processing */
1337 ether_demux_oncpu(ifp, m);
1341 ether_input_handler(struct netmsg *nmsg)
1343 struct netmsg_packet *nmp = (struct netmsg_packet *)nmsg;
1349 ifp = m->m_pkthdr.rcvif;
1351 ether_input_oncpu(ifp, m);
1354 static __inline void
1355 ether_init_netpacket(int num, struct mbuf *m)
1357 struct netmsg_packet *pmsg;
1359 pmsg = &m->m_hdr.mh_netmsg;
1360 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport, MSGF_MPSAFE,
1361 ether_input_handler);
1362 pmsg->nm_packet = m;
1363 pmsg->nm_netmsg.nm_lmsg.u.ms_result = num;
1366 static __inline struct lwkt_port *
1367 ether_mport(int num, struct mbuf **m)
1369 if (num == NETISR_MAX) {
1371 * All packets whose target msgports can't be
1372 * determined here are dispatched to netisr0,
1373 * where further dispatching may happen.
1375 return cpu_portfn(0);
1377 return netisr_find_port(num, m);
1381 * Process a received Ethernet packet.
1383 * The ethernet header is assumed to be in the mbuf so the caller
1384 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
1385 * bytes in the first mbuf.
1387 * We first try to find the target msgport for this ether frame, if
1388 * there is no target msgport for it, this ether frame is discarded,
1389 * else we do following processing according to whether 'chain' is
1391 * - If 'chain' is NULL, this ether frame is sent to the target msgport
1392 * immediately. This situation happens when ether_input_chain is
1393 * accessed through ifnet.if_input.
1394 * - If 'chain' is not NULL, this ether frame is queued to the 'chain'
1395 * bucket indexed by the target msgport's cpuid and the target msgport
1396 * is saved in mbuf's m_pkthdr.m_head. Caller of ether_input_chain
1397 * must initialize 'chain' by calling ether_input_chain_init().
1398 * ether_input_dispatch must be called later to send ether frames
1399 * queued on 'chain' to their target msgport.
1402 ether_input_chain(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain)
1404 struct ether_header *eh, *save_eh, save_eh0;
1405 struct lwkt_port *port;
1406 uint16_t ether_type;
1409 ASSERT_SERIALIZED(ifp->if_serializer);
1412 /* Discard packet if interface is not up */
1413 if (!(ifp->if_flags & IFF_UP)) {
1418 if (m->m_len < sizeof(struct ether_header)) {
1419 /* XXX error in the caller. */
1423 eh = mtod(m, struct ether_header *);
1425 m->m_pkthdr.rcvif = ifp;
1427 logether(chain_beg, ifp);
1429 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
1430 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
1431 ifp->if_addrlen) == 0)
1432 m->m_flags |= M_BCAST;
1434 m->m_flags |= M_MCAST;
1438 ETHER_BPF_MTAP(ifp, m);
1440 ifp->if_ibytes += m->m_pkthdr.len;
1442 if (ifp->if_flags & IFF_MONITOR) {
1444 * Interface marked for monitoring; discard packet.
1448 logether(chain_end, ifp);
1452 if (ntohs(eh->ether_type) == ETHERTYPE_VLAN &&
1453 (m->m_flags & M_VLANTAG) == 0) {
1455 * Extract vlan tag if hardware does not do it for us
1457 vlan_ether_decap(&m);
1460 eh = mtod(m, struct ether_header *);
1462 ether_type = ntohs(eh->ether_type);
1464 if ((m->m_flags & M_VLANTAG) && ether_type == ETHERTYPE_VLAN) {
1466 * To prevent possible dangerous recursion,
1467 * we don't do vlan-in-vlan
1473 KKASSERT(ether_type != ETHERTYPE_VLAN);
1476 * Map ether type to netisr id.
1478 switch (ether_type) {
1490 case ETHERTYPE_IPV6:
1502 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
1509 isr = NETISR_ATALK1;
1511 case ETHERTYPE_AARP:
1517 case ETHERTYPE_MPLS:
1518 case ETHERTYPE_MPLS_MCAST:
1519 m->m_flags |= M_MPLSLABELED;
1526 * NETISR_MAX is an invalid value; it is chosen to let
1527 * ether_mport() know that we are not able to decide
1528 * this packet's msgport here.
1535 * If the packet is in contiguous memory, following
1536 * m_adj() could ensure that the hidden ether header
1537 * will not be destroyed, else we will have to save
1538 * the ether header for the later restoration.
1540 if (m->m_pkthdr.len != m->m_len) {
1542 save_eh = &save_eh0;
1548 * Temporarily remove ether header; ether_mport()
1549 * expects a packet without ether header.
1551 m_adj(m, sizeof(struct ether_header));
1554 * Find the packet's target msgport.
1556 port = ether_mport(isr, &m);
1558 KKASSERT(m == NULL);
1563 * Restore ether header.
1565 if (save_eh != NULL) {
1566 ether_restore_header(&m, eh, save_eh);
1570 m->m_data -= ETHER_HDR_LEN;
1571 m->m_len += ETHER_HDR_LEN;
1572 m->m_pkthdr.len += ETHER_HDR_LEN;
1576 * Initialize mbuf's netmsg packet _after_ possible
1577 * ether header restoration, else the initialized
1578 * netmsg packet may be lost during ether header
1581 ether_init_netpacket(isr, m);
1583 if (chain != NULL) {
1584 struct mbuf_chain *c;
1587 m->m_pkthdr.header = port; /* XXX */
1588 cpuid = port->mpu_td->td_gd->gd_cpuid;
1591 if (c->mc_head == NULL) {
1592 c->mc_head = c->mc_tail = m;
1594 c->mc_tail->m_nextpkt = m;
1597 m->m_nextpkt = NULL;
1599 lwkt_sendmsg(port, &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg);
1601 logether(chain_end, ifp);