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 1.96 2008/11/22 04:00:53 sephe Exp $
38 #include "opt_atalk.h"
40 #include "opt_inet6.h"
43 #include "opt_netgraph.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/globaldata.h>
50 #include <sys/kernel.h>
53 #include <sys/malloc.h>
55 #include <sys/msgport.h>
56 #include <sys/socket.h>
57 #include <sys/sockio.h>
58 #include <sys/sysctl.h>
59 #include <sys/thread.h>
61 #include <sys/thread2.h>
62 #include <sys/mplock2.h>
65 #include <net/netisr.h>
66 #include <net/route.h>
67 #include <net/if_llc.h>
68 #include <net/if_dl.h>
69 #include <net/if_types.h>
70 #include <net/ifq_var.h>
72 #include <net/ethernet.h>
73 #include <net/vlan/if_vlan_ether.h>
74 #include <net/netmsg2.h>
76 #if defined(INET) || defined(INET6)
77 #include <netinet/in.h>
78 #include <netinet/ip_var.h>
79 #include <netinet/if_ether.h>
80 #include <netinet/ip_flow.h>
81 #include <net/ipfw/ip_fw.h>
82 #include <net/dummynet/ip_dummynet.h>
85 #include <netinet6/nd6.h>
89 #include <netinet/ip_carp.h>
93 #include <netproto/ipx/ipx.h>
94 #include <netproto/ipx/ipx_if.h>
95 int (*ef_inputp
)(struct ifnet
*, const struct ether_header
*eh
, struct mbuf
*m
);
96 int (*ef_outputp
)(struct ifnet
*ifp
, struct mbuf
**mp
, struct sockaddr
*dst
,
97 short *tp
, int *hlen
);
101 #include <netns/ns.h>
102 #include <netns/ns_if.h>
104 int ether_outputdebug
= 0;
105 int ether_inputdebug
= 0;
109 #include <netproto/atalk/at.h>
110 #include <netproto/atalk/at_var.h>
111 #include <netproto/atalk/at_extern.h>
113 #define llc_snap_org_code llc_un.type_snap.org_code
114 #define llc_snap_ether_type llc_un.type_snap.ether_type
116 extern u_char at_org_code
[3];
117 extern u_char aarp_org_code
[3];
118 #endif /* NETATALK */
121 #include <netproto/mpls/mpls.h>
124 /* netgraph node hooks for ng_ether(4) */
125 void (*ng_ether_input_p
)(struct ifnet
*ifp
, struct mbuf
**mp
);
126 void (*ng_ether_input_orphan_p
)(struct ifnet
*ifp
,
127 struct mbuf
*m
, const struct ether_header
*eh
);
128 int (*ng_ether_output_p
)(struct ifnet
*ifp
, struct mbuf
**mp
);
129 void (*ng_ether_attach_p
)(struct ifnet
*ifp
);
130 void (*ng_ether_detach_p
)(struct ifnet
*ifp
);
132 void (*vlan_input_p
)(struct mbuf
*);
134 static int ether_output(struct ifnet
*, struct mbuf
*, struct sockaddr
*,
136 static void ether_restore_header(struct mbuf
**, const struct ether_header
*,
137 const struct ether_header
*);
142 struct mbuf
*(*bridge_input_p
)(struct ifnet
*, struct mbuf
*);
143 int (*bridge_output_p
)(struct ifnet
*, struct mbuf
*);
144 void (*bridge_dn_p
)(struct mbuf
*, struct ifnet
*);
146 static int ether_resolvemulti(struct ifnet
*, struct sockaddr
**,
149 const uint8_t etherbroadcastaddr
[ETHER_ADDR_LEN
] = {
150 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
153 #define gotoerr(e) do { error = (e); goto bad; } while (0)
154 #define IFP2AC(ifp) ((struct arpcom *)(ifp))
156 static boolean_t
ether_ipfw_chk(struct mbuf
**m0
, struct ifnet
*dst
,
158 const struct ether_header
*eh
);
160 static int ether_ipfw
;
161 static u_int ether_restore_hdr
;
162 static u_int ether_prepend_hdr
;
165 static u_int ether_pktinfo_try
;
166 static u_int ether_pktinfo_hit
;
167 static u_int ether_rss_nopi
;
168 static u_int ether_rss_nohash
;
171 SYSCTL_DECL(_net_link
);
172 SYSCTL_NODE(_net_link
, IFT_ETHER
, ether
, CTLFLAG_RW
, 0, "Ethernet");
173 SYSCTL_INT(_net_link_ether
, OID_AUTO
, ipfw
, CTLFLAG_RW
,
174 ðer_ipfw
, 0, "Pass ether pkts through firewall");
175 SYSCTL_UINT(_net_link_ether
, OID_AUTO
, restore_hdr
, CTLFLAG_RW
,
176 ðer_restore_hdr
, 0, "# of ether header restoration");
177 SYSCTL_UINT(_net_link_ether
, OID_AUTO
, prepend_hdr
, CTLFLAG_RW
,
178 ðer_prepend_hdr
, 0,
179 "# of ether header restoration which prepends mbuf");
181 SYSCTL_UINT(_net_link_ether
, OID_AUTO
, rss_nopi
, CTLFLAG_RW
,
182 ðer_rss_nopi
, 0, "# of packets do not have pktinfo");
183 SYSCTL_UINT(_net_link_ether
, OID_AUTO
, rss_nohash
, CTLFLAG_RW
,
184 ðer_rss_nohash
, 0, "# of packets do not have hash");
185 SYSCTL_UINT(_net_link_ether
, OID_AUTO
, pktinfo_try
, CTLFLAG_RW
,
186 ðer_pktinfo_try
, 0,
187 "# of tries to find packets' msgport using pktinfo");
188 SYSCTL_UINT(_net_link_ether
, OID_AUTO
, pktinfo_hit
, CTLFLAG_RW
,
189 ðer_pktinfo_hit
, 0,
190 "# of packets whose msgport are found using pktinfo");
193 #define ETHER_KTR_STR "ifp=%p"
194 #define ETHER_KTR_ARG_SIZE (sizeof(void *))
196 #define KTR_ETHERNET KTR_ALL
198 KTR_INFO_MASTER(ether
);
199 KTR_INFO(KTR_ETHERNET
, ether
, chain_beg
, 0, ETHER_KTR_STR
, ETHER_KTR_ARG_SIZE
);
200 KTR_INFO(KTR_ETHERNET
, ether
, chain_end
, 1, ETHER_KTR_STR
, ETHER_KTR_ARG_SIZE
);
201 KTR_INFO(KTR_ETHERNET
, ether
, disp_beg
, 2, ETHER_KTR_STR
, ETHER_KTR_ARG_SIZE
);
202 KTR_INFO(KTR_ETHERNET
, ether
, disp_end
, 3, ETHER_KTR_STR
, ETHER_KTR_ARG_SIZE
);
203 #define logether(name, arg) KTR_LOG(ether_ ## name, arg)
206 * Ethernet output routine.
207 * Encapsulate a packet of type family for the local net.
208 * Use trailer local net encapsulation if enough data in first
209 * packet leaves a multiple of 512 bytes of data in remainder.
210 * Assumes that ifp is actually pointer to arpcom structure.
213 ether_output(struct ifnet
*ifp
, struct mbuf
*m
, struct sockaddr
*dst
,
216 struct ether_header
*eh
, *deh
;
219 int hlen
= ETHER_HDR_LEN
; /* link layer header length */
220 struct arpcom
*ac
= IFP2AC(ifp
);
223 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp
);
225 if (ifp
->if_flags
& IFF_MONITOR
)
227 if ((ifp
->if_flags
& (IFF_UP
| IFF_RUNNING
)) != (IFF_UP
| IFF_RUNNING
))
230 M_PREPEND(m
, sizeof(struct ether_header
), MB_DONTWAIT
);
233 eh
= mtod(m
, struct ether_header
*);
234 edst
= eh
->ether_dhost
;
237 * Fill in the destination ethernet address and frame type.
239 switch (dst
->sa_family
) {
242 if (!arpresolve(ifp
, rt
, m
, dst
, edst
))
243 return (0); /* if not yet resolved */
245 if (m
->m_flags
& M_MPLSLABELED
)
246 eh
->ether_type
= htons(ETHERTYPE_MPLS
);
249 eh
->ether_type
= htons(ETHERTYPE_IP
);
254 if (!nd6_storelladdr(&ac
->ac_if
, rt
, m
, dst
, edst
))
255 return (0); /* Something bad happenned. */
256 eh
->ether_type
= htons(ETHERTYPE_IPV6
);
261 if (ef_outputp
!= NULL
) {
263 * Hold BGL and recheck ef_outputp
266 if (ef_outputp
!= NULL
) {
267 error
= ef_outputp(ifp
, &m
, dst
,
268 &eh
->ether_type
, &hlen
);
277 eh
->ether_type
= htons(ETHERTYPE_IPX
);
278 bcopy(&(((struct sockaddr_ipx
*)dst
)->sipx_addr
.x_host
),
279 edst
, ETHER_ADDR_LEN
);
284 struct at_ifaddr
*aa
;
291 if ((aa
= at_ifawithnet((struct sockaddr_at
*)dst
)) == NULL
) {
297 * In the phase 2 case, need to prepend an mbuf for
298 * the llc header. Since we must preserve the value
299 * of m, which is passed to us by value, we m_copy()
300 * the first mbuf, and use it for our llc header.
302 if (aa
->aa_flags
& AFA_PHASE2
) {
305 M_PREPEND(m
, sizeof(struct llc
), MB_DONTWAIT
);
306 eh
= mtod(m
, struct ether_header
*);
307 edst
= eh
->ether_dhost
;
308 llc
.llc_dsap
= llc
.llc_ssap
= LLC_SNAP_LSAP
;
309 llc
.llc_control
= LLC_UI
;
310 bcopy(at_org_code
, llc
.llc_snap_org_code
,
312 llc
.llc_snap_ether_type
= htons(ETHERTYPE_AT
);
314 mtod(m
, caddr_t
) + sizeof(struct ether_header
),
316 eh
->ether_type
= htons(m
->m_pkthdr
.len
);
317 hlen
= sizeof(struct llc
) + ETHER_HDR_LEN
;
319 eh
->ether_type
= htons(ETHERTYPE_AT
);
321 if (!aarpresolve(ac
, m
, (struct sockaddr_at
*)dst
, edst
)) {
334 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
335 eh
->ether_type
= 0x8137;
337 case 0x0: /* Novell 802.3 */
338 eh
->ether_type
= htons(m
->m_pkthdr
.len
);
340 case 0xe0e0: /* Novell 802.2 and Token-Ring */
341 M_PREPEND(m
, 3, MB_DONTWAIT
);
342 eh
= mtod(m
, struct ether_header
*);
343 edst
= eh
->ether_dhost
;
344 eh
->ether_type
= htons(m
->m_pkthdr
.len
);
345 cp
= mtod(m
, u_char
*) + sizeof(struct ether_header
);
351 bcopy(&(((struct sockaddr_ns
*)dst
)->sns_addr
.x_host
), edst
,
354 * XXX if ns_thishost is the same as the node's ethernet
355 * address then just the default code will catch this anyhow.
356 * So I'm not sure if this next clause should be here at all?
359 if (bcmp(edst
, &ns_thishost
, ETHER_ADDR_LEN
) == 0) {
360 m
->m_pkthdr
.rcvif
= ifp
;
361 netisr_dispatch(NETISR_NS
, m
);
364 if (bcmp(edst
, &ns_broadhost
, ETHER_ADDR_LEN
) == 0)
365 m
->m_flags
|= M_BCAST
;
368 case pseudo_AF_HDRCMPLT
:
370 loop_copy
= -1; /* if this is for us, don't do it */
371 deh
= (struct ether_header
*)dst
->sa_data
;
372 memcpy(edst
, deh
->ether_dhost
, ETHER_ADDR_LEN
);
373 eh
->ether_type
= deh
->ether_type
;
377 if_printf(ifp
, "can't handle af%d\n", dst
->sa_family
);
378 gotoerr(EAFNOSUPPORT
);
381 if (dst
->sa_family
== pseudo_AF_HDRCMPLT
) /* unlikely */
382 memcpy(eh
->ether_shost
,
383 ((struct ether_header
*)dst
->sa_data
)->ether_shost
,
386 memcpy(eh
->ether_shost
, ac
->ac_enaddr
, ETHER_ADDR_LEN
);
389 * Bridges require special output handling.
391 if (ifp
->if_bridge
) {
392 KASSERT(bridge_output_p
!= NULL
,
393 ("%s: if_bridge not loaded!", __func__
));
394 return bridge_output_p(ifp
, m
);
398 * If a simplex interface, and the packet is being sent to our
399 * Ethernet address or a broadcast address, loopback a copy.
400 * XXX To make a simplex device behave exactly like a duplex
401 * device, we should copy in the case of sending to our own
402 * ethernet address (thus letting the original actually appear
403 * on the wire). However, we don't do that here for security
404 * reasons and compatibility with the original behavior.
406 if ((ifp
->if_flags
& IFF_SIMPLEX
) && (loop_copy
!= -1)) {
409 if (m
->m_pkthdr
.csum_flags
& CSUM_IP
)
410 csum_flags
|= (CSUM_IP_CHECKED
| CSUM_IP_VALID
);
411 if (m
->m_pkthdr
.csum_flags
& CSUM_DELAY_DATA
)
412 csum_flags
|= (CSUM_DATA_VALID
| CSUM_PSEUDO_HDR
);
413 if ((m
->m_flags
& M_BCAST
) || (loop_copy
> 0)) {
416 if ((n
= m_copypacket(m
, MB_DONTWAIT
)) != NULL
) {
417 n
->m_pkthdr
.csum_flags
|= csum_flags
;
418 if (csum_flags
& CSUM_DATA_VALID
)
419 n
->m_pkthdr
.csum_data
= 0xffff;
420 if_simloop(ifp
, n
, dst
->sa_family
, hlen
);
423 } else if (bcmp(eh
->ether_dhost
, eh
->ether_shost
,
424 ETHER_ADDR_LEN
) == 0) {
425 m
->m_pkthdr
.csum_flags
|= csum_flags
;
426 if (csum_flags
& CSUM_DATA_VALID
)
427 m
->m_pkthdr
.csum_data
= 0xffff;
428 if_simloop(ifp
, m
, dst
->sa_family
, hlen
);
429 return (0); /* XXX */
436 * Hold BGL and recheck ifp->if_carp
439 if (ifp
->if_carp
&& (error
= carp_output(ifp
, m
, dst
, NULL
))) {
448 /* Handle ng_ether(4) processing, if any */
449 if (ng_ether_output_p
!= NULL
) {
451 * Hold BGL and recheck ng_ether_output_p
454 if (ng_ether_output_p
!= NULL
) {
455 if ((error
= ng_ether_output_p(ifp
, &m
)) != 0) {
467 /* Continue with link-layer output */
468 return ether_output_frame(ifp
, m
);
476 * Ethernet link layer output routine to send a raw frame to the device.
478 * This assumes that the 14 byte Ethernet header is present and contiguous
482 ether_output_frame(struct ifnet
*ifp
, struct mbuf
*m
)
484 struct ip_fw
*rule
= NULL
;
486 struct altq_pktattr pktattr
;
488 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp
);
490 if (m
->m_pkthdr
.fw_flags
& DUMMYNET_MBUF_TAGGED
) {
493 /* Extract info from dummynet tag */
494 mtag
= m_tag_find(m
, PACKET_TAG_DUMMYNET
, NULL
);
495 KKASSERT(mtag
!= NULL
);
496 rule
= ((struct dn_pkt
*)m_tag_data(mtag
))->dn_priv
;
497 KKASSERT(rule
!= NULL
);
499 m_tag_delete(m
, mtag
);
500 m
->m_pkthdr
.fw_flags
&= ~DUMMYNET_MBUF_TAGGED
;
503 if (ifq_is_enabled(&ifp
->if_snd
))
504 altq_etherclassify(&ifp
->if_snd
, m
, &pktattr
);
506 if (IPFW_LOADED
&& ether_ipfw
!= 0) {
507 struct ether_header save_eh
, *eh
;
509 eh
= mtod(m
, struct ether_header
*);
511 m_adj(m
, ETHER_HDR_LEN
);
512 if (!ether_ipfw_chk(&m
, ifp
, &rule
, eh
)) {
516 return ENOBUFS
; /* pkt dropped */
518 return 0; /* consumed e.g. in a pipe */
521 /* packet was ok, restore the ethernet header */
522 ether_restore_header(&m
, eh
, &save_eh
);
531 * Queue message on interface, update output statistics if
532 * successful, and start output if interface not yet active.
534 error
= ifq_dispatch(ifp
, m
, &pktattr
);
539 * ipfw processing for ethernet packets (in and out).
540 * The second parameter is NULL from ether_demux(), and ifp from
541 * ether_output_frame().
544 ether_ipfw_chk(struct mbuf
**m0
, struct ifnet
*dst
, struct ip_fw
**rule
,
545 const struct ether_header
*eh
)
547 struct ether_header save_eh
= *eh
; /* might be a ptr in *m0 */
548 struct ip_fw_args args
;
553 if (*rule
!= NULL
&& fw_one_pass
)
554 return TRUE
; /* dummynet packet, already partially processed */
557 * I need some amount of data to be contiguous.
559 i
= min((*m0
)->m_pkthdr
.len
, max_protohdr
);
560 if ((*m0
)->m_len
< i
) {
561 *m0
= m_pullup(*m0
, i
);
569 if ((mtag
= m_tag_find(*m0
, PACKET_TAG_IPFW_DIVERT
, NULL
)) != NULL
)
570 m_tag_delete(*m0
, mtag
);
571 if ((*m0
)->m_pkthdr
.fw_flags
& IPFORWARD_MBUF_TAGGED
) {
572 mtag
= m_tag_find(*m0
, PACKET_TAG_IPFORWARD
, NULL
);
573 KKASSERT(mtag
!= NULL
);
574 m_tag_delete(*m0
, mtag
);
575 (*m0
)->m_pkthdr
.fw_flags
&= ~IPFORWARD_MBUF_TAGGED
;
578 args
.m
= *m0
; /* the packet we are looking at */
579 args
.oif
= dst
; /* destination, if any */
580 args
.rule
= *rule
; /* matching rule to restart */
581 args
.eh
= &save_eh
; /* MAC header for bridged/MAC packets */
582 i
= ip_fw_chk_ptr(&args
);
597 * XXX at some point add support for divert/forward actions.
598 * If none of the above matches, we have to drop the pkt.
604 * Pass the pkt to dummynet, which consumes it.
606 m
= *m0
; /* pass the original to dummynet */
607 *m0
= NULL
; /* and nothing back to the caller */
609 ether_restore_header(&m
, eh
, &save_eh
);
613 ip_fw_dn_io_ptr(m
, args
.cookie
,
614 dst
? DN_TO_ETH_OUT
: DN_TO_ETH_DEMUX
, &args
);
619 panic("unknown ipfw return value: %d\n", i
);
624 ether_input(struct ifnet
*ifp
, struct mbuf
*m
)
626 ether_input_chain(ifp
, m
, NULL
, NULL
);
630 * Perform common duties while attaching to interface list
633 ether_ifattach(struct ifnet
*ifp
, uint8_t *lla
, lwkt_serialize_t serializer
)
635 ether_ifattach_bpf(ifp
, lla
, DLT_EN10MB
, sizeof(struct ether_header
),
640 ether_ifattach_bpf(struct ifnet
*ifp
, uint8_t *lla
, u_int dlt
, u_int hdrlen
,
641 lwkt_serialize_t serializer
)
643 struct sockaddr_dl
*sdl
;
645 ifp
->if_type
= IFT_ETHER
;
646 ifp
->if_addrlen
= ETHER_ADDR_LEN
;
647 ifp
->if_hdrlen
= ETHER_HDR_LEN
;
648 if_attach(ifp
, serializer
);
649 ifp
->if_mtu
= ETHERMTU
;
650 if (ifp
->if_baudrate
== 0)
651 ifp
->if_baudrate
= 10000000;
652 ifp
->if_output
= ether_output
;
653 ifp
->if_input
= ether_input
;
654 ifp
->if_resolvemulti
= ether_resolvemulti
;
655 ifp
->if_broadcastaddr
= etherbroadcastaddr
;
656 sdl
= IF_LLSOCKADDR(ifp
);
657 sdl
->sdl_type
= IFT_ETHER
;
658 sdl
->sdl_alen
= ifp
->if_addrlen
;
659 bcopy(lla
, LLADDR(sdl
), ifp
->if_addrlen
);
661 * XXX Keep the current drivers happy.
662 * XXX Remove once all drivers have been cleaned up
664 if (lla
!= IFP2AC(ifp
)->ac_enaddr
)
665 bcopy(lla
, IFP2AC(ifp
)->ac_enaddr
, ifp
->if_addrlen
);
666 bpfattach(ifp
, dlt
, hdrlen
);
667 if (ng_ether_attach_p
!= NULL
)
668 (*ng_ether_attach_p
)(ifp
);
670 if_printf(ifp
, "MAC address: %6D\n", lla
, ":");
674 * Perform common duties while detaching an Ethernet interface
677 ether_ifdetach(struct ifnet
*ifp
)
681 if (ng_ether_detach_p
!= NULL
)
682 (*ng_ether_detach_p
)(ifp
);
688 ether_ioctl(struct ifnet
*ifp
, int command
, caddr_t data
)
690 struct ifaddr
*ifa
= (struct ifaddr
*) data
;
691 struct ifreq
*ifr
= (struct ifreq
*) data
;
694 #define IF_INIT(ifp) \
696 if (((ifp)->if_flags & IFF_UP) == 0) { \
697 (ifp)->if_flags |= IFF_UP; \
698 (ifp)->if_init((ifp)->if_softc); \
702 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
706 switch (ifa
->ifa_addr
->sa_family
) {
709 IF_INIT(ifp
); /* before arpwhohas */
710 arp_ifinit(ifp
, ifa
);
715 * XXX - This code is probably wrong
719 struct ipx_addr
*ina
= &IA_SIPX(ifa
)->sipx_addr
;
720 struct arpcom
*ac
= IFP2AC(ifp
);
722 if (ipx_nullhost(*ina
))
723 ina
->x_host
= *(union ipx_host
*) ac
->ac_enaddr
;
725 bcopy(ina
->x_host
.c_host
, ac
->ac_enaddr
,
726 sizeof ac
->ac_enaddr
);
728 IF_INIT(ifp
); /* Set new address. */
734 * XXX - This code is probably wrong
738 struct ns_addr
*ina
= &(IA_SNS(ifa
)->sns_addr
);
739 struct arpcom
*ac
= IFP2AC(ifp
);
741 if (ns_nullhost(*ina
))
742 ina
->x_host
= *(union ns_host
*)(ac
->ac_enaddr
);
744 bcopy(ina
->x_host
.c_host
, ac
->ac_enaddr
,
745 sizeof ac
->ac_enaddr
);
761 bcopy(IFP2AC(ifp
)->ac_enaddr
,
762 ((struct sockaddr
*)ifr
->ifr_data
)->sa_data
,
768 * Set the interface MTU.
770 if (ifr
->ifr_mtu
> ETHERMTU
) {
773 ifp
->if_mtu
= ifr
->ifr_mtu
;
788 struct sockaddr
**llsa
,
791 struct sockaddr_dl
*sdl
;
792 struct sockaddr_in
*sin
;
794 struct sockaddr_in6
*sin6
;
798 switch(sa
->sa_family
) {
801 * No mapping needed. Just check that it's a valid MC address.
803 sdl
= (struct sockaddr_dl
*)sa
;
804 e_addr
= LLADDR(sdl
);
805 if ((e_addr
[0] & 1) != 1)
806 return EADDRNOTAVAIL
;
812 sin
= (struct sockaddr_in
*)sa
;
813 if (!IN_MULTICAST(ntohl(sin
->sin_addr
.s_addr
)))
814 return EADDRNOTAVAIL
;
815 MALLOC(sdl
, struct sockaddr_dl
*, sizeof *sdl
, M_IFMADDR
,
817 sdl
->sdl_len
= sizeof *sdl
;
818 sdl
->sdl_family
= AF_LINK
;
819 sdl
->sdl_index
= ifp
->if_index
;
820 sdl
->sdl_type
= IFT_ETHER
;
821 sdl
->sdl_alen
= ETHER_ADDR_LEN
;
822 e_addr
= LLADDR(sdl
);
823 ETHER_MAP_IP_MULTICAST(&sin
->sin_addr
, e_addr
);
824 *llsa
= (struct sockaddr
*)sdl
;
829 sin6
= (struct sockaddr_in6
*)sa
;
830 if (IN6_IS_ADDR_UNSPECIFIED(&sin6
->sin6_addr
)) {
832 * An IP6 address of 0 means listen to all
833 * of the Ethernet multicast address used for IP6.
834 * (This is used for multicast routers.)
836 ifp
->if_flags
|= IFF_ALLMULTI
;
840 if (!IN6_IS_ADDR_MULTICAST(&sin6
->sin6_addr
))
841 return EADDRNOTAVAIL
;
842 MALLOC(sdl
, struct sockaddr_dl
*, sizeof *sdl
, M_IFMADDR
,
844 sdl
->sdl_len
= sizeof *sdl
;
845 sdl
->sdl_family
= AF_LINK
;
846 sdl
->sdl_index
= ifp
->if_index
;
847 sdl
->sdl_type
= IFT_ETHER
;
848 sdl
->sdl_alen
= ETHER_ADDR_LEN
;
849 e_addr
= LLADDR(sdl
);
850 ETHER_MAP_IPV6_MULTICAST(&sin6
->sin6_addr
, e_addr
);
851 *llsa
= (struct sockaddr
*)sdl
;
857 * Well, the text isn't quite right, but it's the name
866 * This is for reference. We have a table-driven version
867 * of the little-endian crc32 generator, which is faster
868 * than the double-loop.
871 ether_crc32_le(const uint8_t *buf
, size_t len
)
873 uint32_t c
, crc
, carry
;
876 crc
= 0xffffffffU
; /* initial value */
878 for (i
= 0; i
< len
; i
++) {
880 for (j
= 0; j
< 8; j
++) {
881 carry
= ((crc
& 0x01) ? 1 : 0) ^ (c
& 0x01);
885 crc
= (crc
^ ETHER_CRC_POLY_LE
);
893 ether_crc32_le(const uint8_t *buf
, size_t len
)
895 static const uint32_t crctab
[] = {
896 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
897 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
898 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
899 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
904 crc
= 0xffffffffU
; /* initial value */
906 for (i
= 0; i
< len
; i
++) {
908 crc
= (crc
>> 4) ^ crctab
[crc
& 0xf];
909 crc
= (crc
>> 4) ^ crctab
[crc
& 0xf];
917 ether_crc32_be(const uint8_t *buf
, size_t len
)
919 uint32_t c
, crc
, carry
;
922 crc
= 0xffffffffU
; /* initial value */
924 for (i
= 0; i
< len
; i
++) {
926 for (j
= 0; j
< 8; j
++) {
927 carry
= ((crc
& 0x80000000U
) ? 1 : 0) ^ (c
& 0x01);
931 crc
= (crc
^ ETHER_CRC_POLY_BE
) | carry
;
939 * find the size of ethernet header, and call classifier
942 altq_etherclassify(struct ifaltq
*ifq
, struct mbuf
*m
,
943 struct altq_pktattr
*pktattr
)
945 struct ether_header
*eh
;
947 int hlen
, af
, hdrsize
;
950 hlen
= sizeof(struct ether_header
);
951 eh
= mtod(m
, struct ether_header
*);
953 ether_type
= ntohs(eh
->ether_type
);
954 if (ether_type
< ETHERMTU
) {
956 struct llc
*llc
= (struct llc
*)(eh
+ 1);
959 if (m
->m_len
< hlen
||
960 llc
->llc_dsap
!= LLC_SNAP_LSAP
||
961 llc
->llc_ssap
!= LLC_SNAP_LSAP
||
962 llc
->llc_control
!= LLC_UI
)
963 goto bad
; /* not snap! */
965 ether_type
= ntohs(llc
->llc_un
.type_snap
.ether_type
);
968 if (ether_type
== ETHERTYPE_IP
) {
970 hdrsize
= 20; /* sizeof(struct ip) */
972 } else if (ether_type
== ETHERTYPE_IPV6
) {
974 hdrsize
= 40; /* sizeof(struct ip6_hdr) */
979 while (m
->m_len
<= hlen
) {
983 hdr
= m
->m_data
+ hlen
;
984 if (m
->m_len
< hlen
+ hdrsize
) {
986 * ip header is not in a single mbuf. this should not
987 * happen in the current code.
988 * (todo: use m_pulldown in the future)
994 ifq_classify(ifq
, m
, af
, pktattr
);
1001 pktattr
->pattr_class
= NULL
;
1002 pktattr
->pattr_hdr
= NULL
;
1003 pktattr
->pattr_af
= AF_UNSPEC
;
1007 ether_restore_header(struct mbuf
**m0
, const struct ether_header
*eh
,
1008 const struct ether_header
*save_eh
)
1010 struct mbuf
*m
= *m0
;
1012 ether_restore_hdr
++;
1015 * Prepend the header, optimize for the common case of
1016 * eh pointing into the mbuf.
1018 if ((const void *)(eh
+ 1) == (void *)m
->m_data
) {
1019 m
->m_data
-= ETHER_HDR_LEN
;
1020 m
->m_len
+= ETHER_HDR_LEN
;
1021 m
->m_pkthdr
.len
+= ETHER_HDR_LEN
;
1023 ether_prepend_hdr
++;
1025 M_PREPEND(m
, ETHER_HDR_LEN
, MB_DONTWAIT
);
1027 bcopy(save_eh
, mtod(m
, struct ether_header
*),
1035 ether_input_ipifunc(void *arg
)
1037 struct mbuf
*m
, *next
;
1042 next
= m
->m_nextpkt
;
1043 m
->m_nextpkt
= NULL
;
1045 port
= m
->m_pkthdr
.header
;
1046 m
->m_pkthdr
.header
= NULL
;
1049 &m
->m_hdr
.mh_netmsg
.nm_netmsg
.nm_lmsg
);
1052 } while (m
!= NULL
);
1056 ether_input_dispatch(struct mbuf_chain
*chain
)
1061 logether(disp_beg
, NULL
);
1062 for (i
= 0; i
< ncpus
; ++i
) {
1063 if (chain
[i
].mc_head
!= NULL
) {
1064 lwkt_send_ipiq(globaldata_find(i
),
1065 ether_input_ipifunc
, chain
[i
].mc_head
);
1069 logether(disp_beg
, NULL
);
1070 if (chain
->mc_head
!= NULL
)
1071 ether_input_ipifunc(chain
->mc_head
);
1073 logether(disp_end
, NULL
);
1077 ether_input_chain_init(struct mbuf_chain
*chain
)
1082 for (i
= 0; i
< ncpus
; ++i
)
1083 chain
[i
].mc_head
= chain
[i
].mc_tail
= NULL
;
1085 chain
->mc_head
= chain
->mc_tail
= NULL
;
1090 * Upper layer processing for a received Ethernet packet.
1093 ether_demux_oncpu(struct ifnet
*ifp
, struct mbuf
*m
)
1095 struct ether_header
*eh
;
1096 int isr
, redispatch
, discard
= 0;
1098 struct ip_fw
*rule
= NULL
;
1104 KASSERT(m
->m_len
>= ETHER_HDR_LEN
,
1105 ("ether header is no contiguous!\n"));
1107 eh
= mtod(m
, struct ether_header
*);
1109 if (m
->m_pkthdr
.fw_flags
& DUMMYNET_MBUF_TAGGED
) {
1112 /* Extract info from dummynet tag */
1113 mtag
= m_tag_find(m
, PACKET_TAG_DUMMYNET
, NULL
);
1114 KKASSERT(mtag
!= NULL
);
1115 rule
= ((struct dn_pkt
*)m_tag_data(mtag
))->dn_priv
;
1116 KKASSERT(rule
!= NULL
);
1118 m_tag_delete(m
, mtag
);
1119 m
->m_pkthdr
.fw_flags
&= ~DUMMYNET_MBUF_TAGGED
;
1121 /* packet is passing the second time */
1127 * XXX: Okay, we need to call carp_forus() and - if it is for
1128 * us jump over code that does the normal check
1129 * "ac_enaddr == ether_dhost". The check sequence is a bit
1130 * different from OpenBSD, so we jump over as few code as
1131 * possible, to catch _all_ sanity checks. This needs
1132 * evaluation, to see if the carp ether_dhost values break any
1137 * Hold BGL and recheck ifp->if_carp
1140 if (ifp
->if_carp
&& carp_forus(ifp
->if_carp
, eh
->ether_dhost
)) {
1149 * We got a packet which was unicast to a different Ethernet
1150 * address. If the driver is working properly, then this
1151 * situation can only happen when the interface is in
1152 * promiscuous mode. We defer the packet discarding until the
1153 * vlan processing is done, so that vlan/bridge or vlan/netgraph
1156 if (((ifp
->if_flags
& (IFF_PROMISC
| IFF_PPROMISC
)) == IFF_PROMISC
) &&
1157 !ETHER_IS_MULTICAST(eh
->ether_dhost
) &&
1158 bcmp(eh
->ether_dhost
, IFP2AC(ifp
)->ac_enaddr
, ETHER_ADDR_LEN
))
1162 if (IPFW_LOADED
&& ether_ipfw
!= 0 && !discard
) {
1163 struct ether_header save_eh
= *eh
;
1165 /* XXX old crufty stuff, needs to be removed */
1166 m_adj(m
, sizeof(struct ether_header
));
1168 if (!ether_ipfw_chk(&m
, NULL
, &rule
, eh
)) {
1173 ether_restore_header(&m
, eh
, &save_eh
);
1176 eh
= mtod(m
, struct ether_header
*);
1179 ether_type
= ntohs(eh
->ether_type
);
1180 KKASSERT(ether_type
!= ETHERTYPE_VLAN
);
1182 if (m
->m_flags
& M_VLANTAG
) {
1183 void (*vlan_input_func
)(struct mbuf
*);
1185 vlan_input_func
= vlan_input_p
;
1186 if (vlan_input_func
!= NULL
) {
1189 m
->m_pkthdr
.rcvif
->if_noproto
++;
1196 * If we have been asked to discard this packet
1197 * (e.g. not for us), drop it before entering
1206 * Clear protocol specific flags,
1207 * before entering the upper layer.
1209 m
->m_flags
&= ~M_ETHER_FLAGS
;
1211 /* Strip ethernet header. */
1212 m_adj(m
, sizeof(struct ether_header
));
1215 * By default, we don't need to do the redispatch; for the
1216 * most common packet types, e.g. IPv4, ether_input_chain()
1217 * has already picked up the correct target network msgport.
1221 switch (ether_type
) {
1224 if ((m
->m_flags
& M_LENCHECKED
) == 0) {
1225 if (!ip_lengthcheck(&m
))
1228 if (ipflow_fastforward(m
))
1234 if (ifp
->if_flags
& IFF_NOARP
) {
1235 /* Discard packet if ARP is disabled on interface */
1244 case ETHERTYPE_IPV6
:
1253 * Hold BGL and recheck ef_inputp
1256 if (ef_inputp
&& ef_inputp(ifp
, eh
, m
) == 0) {
1267 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
1275 isr
= NETISR_ATALK1
;
1277 case ETHERTYPE_AARP
:
1283 case ETHERTYPE_MPLS
:
1284 case ETHERTYPE_MPLS_MCAST
:
1285 /* Should have been set by ether_input_chain(). */
1286 KKASSERT(m
->m_flags
& M_MPLSLABELED
);
1293 * The accurate msgport is not determined before
1294 * we reach here, so redo the dispatching
1300 * Hold BGL and recheck ef_inputp
1303 if (ef_inputp
&& ef_inputp(ifp
, eh
, m
) == 0) {
1311 checksum
= mtod(m
, ushort
*);
1313 if ((ether_type
<= ETHERMTU
) &&
1314 ((*checksum
== 0xffff) || (*checksum
== 0xE0E0))) {
1315 if (*checksum
== 0xE0E0) {
1316 m
->m_pkthdr
.len
-= 3;
1325 if (ether_type
> ETHERMTU
)
1327 l
= mtod(m
, struct llc
*);
1328 if (l
->llc_dsap
== LLC_SNAP_LSAP
&&
1329 l
->llc_ssap
== LLC_SNAP_LSAP
&&
1330 l
->llc_control
== LLC_UI
) {
1331 if (bcmp(&(l
->llc_snap_org_code
)[0], at_org_code
,
1332 sizeof at_org_code
) == 0 &&
1333 ntohs(l
->llc_snap_ether_type
) == ETHERTYPE_AT
) {
1334 m_adj(m
, sizeof(struct llc
));
1335 isr
= NETISR_ATALK2
;
1338 if (bcmp(&(l
->llc_snap_org_code
)[0], aarp_org_code
,
1339 sizeof aarp_org_code
) == 0 &&
1340 ntohs(l
->llc_snap_ether_type
) == ETHERTYPE_AARP
) {
1341 m_adj(m
, sizeof(struct llc
));
1348 if (ng_ether_input_orphan_p
!= NULL
) {
1350 * Hold BGL and recheck ng_ether_input_orphan_p
1353 if (ng_ether_input_orphan_p
!= NULL
) {
1354 ng_ether_input_orphan_p(ifp
, m
, eh
);
1367 netisr_dispatch(isr
, m
);
1371 * First we perform any link layer operations, then continue to the
1372 * upper layers with ether_demux_oncpu().
1375 ether_input_oncpu(struct ifnet
*ifp
, struct mbuf
*m
)
1377 if ((ifp
->if_flags
& (IFF_UP
| IFF_MONITOR
)) != IFF_UP
) {
1379 * Receiving interface's flags are changed, when this
1380 * packet is waiting for processing; discard it.
1387 * Tap the packet off here for a bridge. bridge_input()
1388 * will return NULL if it has consumed the packet, otherwise
1389 * it gets processed as normal. Note that bridge_input()
1390 * will always return the original packet if we need to
1391 * process it locally.
1393 if (ifp
->if_bridge
) {
1394 KASSERT(bridge_input_p
!= NULL
,
1395 ("%s: if_bridge not loaded!", __func__
));
1397 if(m
->m_flags
& M_ETHER_BRIDGED
) {
1398 m
->m_flags
&= ~M_ETHER_BRIDGED
;
1400 m
= bridge_input_p(ifp
, m
);
1404 KASSERT(ifp
== m
->m_pkthdr
.rcvif
,
1405 ("bridge_input_p changed rcvif\n"));
1409 /* Handle ng_ether(4) processing, if any */
1410 if (ng_ether_input_p
!= NULL
) {
1412 * Hold BGL and recheck ng_ether_input_p
1415 if (ng_ether_input_p
!= NULL
)
1416 ng_ether_input_p(ifp
, &m
);
1423 /* Continue with upper layer processing */
1424 ether_demux_oncpu(ifp
, m
);
1428 * Perform certain functions of ether_input_chain():
1430 * - Update statistics
1431 * - Run bpf(4) tap if requested
1432 * Then pass the packet to ether_input_oncpu().
1434 * This function should be used by pseudo interface (e.g. vlan(4)),
1435 * when it tries to claim that the packet is received by it.
1438 ether_reinput_oncpu(struct ifnet
*ifp
, struct mbuf
*m
, int run_bpf
)
1440 /* Discard packet if interface is not up */
1441 if (!(ifp
->if_flags
& IFF_UP
)) {
1446 /* Change receiving interface */
1447 m
->m_pkthdr
.rcvif
= ifp
;
1449 /* Update statistics */
1451 ifp
->if_ibytes
+= m
->m_pkthdr
.len
;
1452 if (m
->m_flags
& (M_MCAST
| M_BCAST
))
1458 ether_input_oncpu(ifp
, m
);
1461 static __inline boolean_t
1462 ether_vlancheck(struct mbuf
**m0
)
1464 struct mbuf
*m
= *m0
;
1465 struct ether_header
*eh
;
1466 uint16_t ether_type
;
1468 eh
= mtod(m
, struct ether_header
*);
1469 ether_type
= ntohs(eh
->ether_type
);
1471 if (ether_type
== ETHERTYPE_VLAN
&& (m
->m_flags
& M_VLANTAG
) == 0) {
1473 * Extract vlan tag if hardware does not do it for us
1475 vlan_ether_decap(&m
);
1479 eh
= mtod(m
, struct ether_header
*);
1480 ether_type
= ntohs(eh
->ether_type
);
1483 if (ether_type
== ETHERTYPE_VLAN
&& (m
->m_flags
& M_VLANTAG
)) {
1485 * To prevent possible dangerous recursion,
1486 * we don't do vlan-in-vlan
1488 m
->m_pkthdr
.rcvif
->if_noproto
++;
1491 KKASSERT(ether_type
!= ETHERTYPE_VLAN
);
1493 m
->m_flags
|= M_ETHER_VLANCHECKED
;
1504 ether_input_handler(struct netmsg
*nmsg
)
1506 struct netmsg_packet
*nmp
= (struct netmsg_packet
*)nmsg
;
1507 struct ether_header
*eh
;
1513 ifp
= m
->m_pkthdr
.rcvif
;
1515 eh
= mtod(m
, struct ether_header
*);
1516 if (ETHER_IS_MULTICAST(eh
->ether_dhost
)) {
1517 if (bcmp(ifp
->if_broadcastaddr
, eh
->ether_dhost
,
1518 ifp
->if_addrlen
) == 0)
1519 m
->m_flags
|= M_BCAST
;
1521 m
->m_flags
|= M_MCAST
;
1525 if ((m
->m_flags
& M_ETHER_VLANCHECKED
) == 0) {
1526 if (!ether_vlancheck(&m
)) {
1527 KKASSERT(m
== NULL
);
1532 ether_input_oncpu(ifp
, m
);
1535 static __inline
void
1536 ether_init_netpacket(int num
, struct mbuf
*m
)
1538 struct netmsg_packet
*pmsg
;
1540 pmsg
= &m
->m_hdr
.mh_netmsg
;
1541 netmsg_init(&pmsg
->nm_netmsg
, NULL
, &netisr_apanic_rport
,
1542 MSGF_MPSAFE
, ether_input_handler
);
1543 pmsg
->nm_packet
= m
;
1544 pmsg
->nm_netmsg
.nm_lmsg
.u
.ms_result
= num
;
1547 static __inline
struct lwkt_port
*
1548 ether_mport(int num
, struct mbuf
**m
)
1550 if (num
== NETISR_MAX
) {
1552 * All packets whose target msgports can't be
1553 * determined here are dispatched to netisr0,
1554 * where further dispatching may happen.
1556 return cpu_portfn(0);
1558 return netisr_find_port(num
, m
);
1562 * Send the packet to the target msgport or
1563 * queue it into 'chain'.
1566 ether_dispatch(int isr
, struct lwkt_port
*port
, struct mbuf
*m
,
1567 struct mbuf_chain
*chain
)
1569 ether_init_netpacket(isr
, m
);
1571 if (chain
!= NULL
) {
1572 struct mbuf_chain
*c
;
1575 m
->m_pkthdr
.header
= port
; /* XXX */
1576 cpuid
= port
->mpu_td
->td_gd
->gd_cpuid
;
1579 if (c
->mc_head
== NULL
) {
1580 c
->mc_head
= c
->mc_tail
= m
;
1582 c
->mc_tail
->m_nextpkt
= m
;
1585 m
->m_nextpkt
= NULL
;
1587 lwkt_sendmsg(port
, &m
->m_hdr
.mh_netmsg
.nm_netmsg
.nm_lmsg
);
1592 * Process a received Ethernet packet.
1594 * The ethernet header is assumed to be in the mbuf so the caller
1595 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
1596 * bytes in the first mbuf.
1598 * We first try to find the target msgport for this ether frame, if
1599 * there is no target msgport for it, this ether frame is discarded,
1600 * else we do following processing according to whether 'chain' is
1602 * - If 'chain' is NULL, this ether frame is sent to the target msgport
1603 * immediately. This situation happens when ether_input_chain is
1604 * accessed through ifnet.if_input.
1605 * - If 'chain' is not NULL, this ether frame is queued to the 'chain'
1606 * bucket indexed by the target msgport's cpuid and the target msgport
1607 * is saved in mbuf's m_pkthdr.m_head. Caller of ether_input_chain
1608 * must initialize 'chain' by calling ether_input_chain_init().
1609 * ether_input_dispatch must be called later to send ether frames
1610 * queued on 'chain' to their target msgport.
1613 ether_input_chain(struct ifnet
*ifp
, struct mbuf
*m
, const struct pktinfo
*pi
,
1614 struct mbuf_chain
*chain
)
1616 struct ether_header
*eh
, *save_eh
, save_eh0
;
1617 struct lwkt_port
*port
;
1618 uint16_t ether_type
;
1623 /* Discard packet if interface is not up */
1624 if (!(ifp
->if_flags
& IFF_UP
)) {
1629 if (m
->m_len
< sizeof(struct ether_header
)) {
1630 /* XXX error in the caller. */
1635 m
->m_pkthdr
.rcvif
= ifp
;
1637 logether(chain_beg
, ifp
);
1639 ETHER_BPF_MTAP(ifp
, m
);
1641 ifp
->if_ibytes
+= m
->m_pkthdr
.len
;
1643 if (ifp
->if_flags
& IFF_MONITOR
) {
1644 eh
= mtod(m
, struct ether_header
*);
1645 if (ETHER_IS_MULTICAST(eh
->ether_dhost
))
1649 * Interface marked for monitoring; discard packet.
1653 logether(chain_end
, ifp
);
1657 if (pi
!= NULL
&& (m
->m_flags
& M_HASH
)) {
1659 ether_pktinfo_try
++;
1661 /* Try finding the port using the packet info */
1662 port
= netisr_find_pktinfo_port(pi
, m
);
1665 ether_pktinfo_hit
++;
1667 ether_dispatch(pi
->pi_netisr
, port
, m
, chain
);
1669 logether(chain_end
, ifp
);
1674 * The packet info does not contain enough
1675 * information, we will have to check the
1680 else if (ifp
->if_capenable
& IFCAP_RSS
) {
1689 * Packet hash will be recalculated by software,
1690 * so clear the M_HASH flag set by the driver;
1691 * the hash value calculated by the hardware may
1692 * not be exactly what we want.
1694 m
->m_flags
&= ~M_HASH
;
1696 if (!ether_vlancheck(&m
)) {
1697 KKASSERT(m
== NULL
);
1698 logether(chain_end
, ifp
);
1701 eh
= mtod(m
, struct ether_header
*);
1702 ether_type
= ntohs(eh
->ether_type
);
1705 * Map ether type to netisr id.
1707 switch (ether_type
) {
1719 case ETHERTYPE_IPV6
:
1731 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
1738 isr
= NETISR_ATALK1
;
1740 case ETHERTYPE_AARP
:
1746 case ETHERTYPE_MPLS
:
1747 case ETHERTYPE_MPLS_MCAST
:
1748 m
->m_flags
|= M_MPLSLABELED
;
1755 * NETISR_MAX is an invalid value; it is chosen to let
1756 * ether_mport() know that we are not able to decide
1757 * this packet's msgport here.
1764 * If the packet is in contiguous memory, following
1765 * m_adj() could ensure that the hidden ether header
1766 * will not be destroyed, else we will have to save
1767 * the ether header for the later restoration.
1769 if (m
->m_pkthdr
.len
!= m
->m_len
) {
1771 save_eh
= &save_eh0
;
1777 * Temporarily remove ether header; ether_mport()
1778 * expects a packet without ether header.
1780 m_adj(m
, sizeof(struct ether_header
));
1783 * Find the packet's target msgport.
1785 port
= ether_mport(isr
, &m
);
1787 KKASSERT(m
== NULL
);
1788 logether(chain_end
, ifp
);
1793 * Restore ether header.
1795 if (save_eh
!= NULL
) {
1796 ether_restore_header(&m
, eh
, save_eh
);
1798 logether(chain_end
, ifp
);
1802 m
->m_data
-= ETHER_HDR_LEN
;
1803 m
->m_len
+= ETHER_HDR_LEN
;
1804 m
->m_pkthdr
.len
+= ETHER_HDR_LEN
;
1807 ether_dispatch(isr
, port
, m
, chain
);
1809 logether(chain_end
, ifp
);
1812 MODULE_VERSION(ether
, 1);