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[dragonfly.git] / sys / net / if_ethersubr.c
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1/*
2 * Copyright (c) 1982, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 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.
20 *
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
31 * SUCH DAMAGE.
32 *
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 $
267caeeb 35 * $DragonFly: src/sys/net/if_ethersubr.c,v 1.15 2004/07/02 17:42:21 joerg Exp $
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36 */
37
38#include "opt_atalk.h"
39#include "opt_inet.h"
40#include "opt_inet6.h"
41#include "opt_ipx.h"
42#include "opt_bdg.h"
43#include "opt_netgraph.h"
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/kernel.h>
48#include <sys/malloc.h>
49#include <sys/mbuf.h>
50#include <sys/socket.h>
51#include <sys/sockio.h>
52#include <sys/sysctl.h>
53
54#include <net/if.h>
55#include <net/netisr.h>
56#include <net/route.h>
57#include <net/if_llc.h>
58#include <net/if_dl.h>
59#include <net/if_types.h>
60#include <net/bpf.h>
61#include <net/ethernet.h>
1f2de5d4 62#include <net/bridge/bridge.h>
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63
64#if defined(INET) || defined(INET6)
65#include <netinet/in.h>
66#include <netinet/in_var.h>
67#include <netinet/if_ether.h>
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68#include <net/ipfw/ip_fw.h>
69#include <net/dummynet/ip_dummynet.h>
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70#endif
71#ifdef INET6
72#include <netinet6/nd6.h>
73#endif
74
75#ifdef IPX
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76#include <netproto/ipx/ipx.h>
77#include <netproto/ipx/ipx_if.h>
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78int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
79int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
80 struct sockaddr *dst, short *tp, int *hlen);
81#endif
82
83#ifdef NS
84#include <netns/ns.h>
85#include <netns/ns_if.h>
86ushort ns_nettype;
87int ether_outputdebug = 0;
88int ether_inputdebug = 0;
89#endif
90
91#ifdef NETATALK
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92#include <netproto/atalk/at.h>
93#include <netproto/atalk/at_var.h>
94#include <netproto/atalk/at_extern.h>
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95
96#define llc_snap_org_code llc_un.type_snap.org_code
97#define llc_snap_ether_type llc_un.type_snap.ether_type
98
99extern u_char at_org_code[3];
100extern u_char aarp_org_code[3];
101#endif /* NETATALK */
102
103/* netgraph node hooks for ng_ether(4) */
104void (*ng_ether_input_p)(struct ifnet *ifp,
105 struct mbuf **mp, struct ether_header *eh);
106void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
107 struct mbuf *m, struct ether_header *eh);
108int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
109void (*ng_ether_attach_p)(struct ifnet *ifp);
110void (*ng_ether_detach_p)(struct ifnet *ifp);
111
112int (*vlan_input_p)(struct ether_header *eh, struct mbuf *m);
113int (*vlan_input_tag_p)(struct ether_header *eh, struct mbuf *m,
114 u_int16_t t);
115
116/* bridge support */
117int do_bridge;
118bridge_in_t *bridge_in_ptr;
119bdg_forward_t *bdg_forward_ptr;
120bdgtakeifaces_t *bdgtakeifaces_ptr;
121struct bdg_softc *ifp2sc;
122
123static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
124 struct sockaddr *);
125u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
126#define senderr(e) do { error = (e); goto bad;} while (0)
127#define IFP2AC(IFP) ((struct arpcom *)IFP)
128
129int
130ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
131 struct ip_fw **rule, struct ether_header *eh, int shared);
132static int ether_ipfw;
133
134/*
135 * Ethernet output routine.
136 * Encapsulate a packet of type family for the local net.
137 * Use trailer local net encapsulation if enough data in first
138 * packet leaves a multiple of 512 bytes of data in remainder.
139 * Assumes that ifp is actually pointer to arpcom structure.
140 */
141int
142ether_output(ifp, m, dst, rt0)
82ed7fc2 143 struct ifnet *ifp;
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144 struct mbuf *m;
145 struct sockaddr *dst;
146 struct rtentry *rt0;
147{
148 short type;
149 int error = 0, hdrcmplt = 0;
150 u_char esrc[6], edst[6];
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151 struct rtentry *rt;
152 struct ether_header *eh;
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153 int loop_copy = 0;
154 int hlen; /* link layer header lenght */
155 struct arpcom *ac = IFP2AC(ifp);
156
157 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
158 senderr(ENETDOWN);
159 rt = rt0;
160 if (rt) {
161 if ((rt->rt_flags & RTF_UP) == 0) {
162 rt0 = rt = rtalloc1(dst, 1, 0UL);
163 if (rt0)
164 rt->rt_refcnt--;
165 else
166 senderr(EHOSTUNREACH);
167 }
168 if (rt->rt_flags & RTF_GATEWAY) {
169 if (rt->rt_gwroute == 0)
170 goto lookup;
171 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
172 rtfree(rt); rt = rt0;
173 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
174 0UL);
175 if ((rt = rt->rt_gwroute) == 0)
176 senderr(EHOSTUNREACH);
177 }
178 }
179 if (rt->rt_flags & RTF_REJECT)
180 if (rt->rt_rmx.rmx_expire == 0 ||
181 time_second < rt->rt_rmx.rmx_expire)
182 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
183 }
184 hlen = ETHER_HDR_LEN;
185 switch (dst->sa_family) {
186#ifdef INET
187 case AF_INET:
188 if (!arpresolve(ifp, rt, m, dst, edst, rt0))
189 return (0); /* if not yet resolved */
190 type = htons(ETHERTYPE_IP);
191 break;
192#endif
193#ifdef INET6
194 case AF_INET6:
195 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {
196 /* Something bad happened */
197 return(0);
198 }
199 type = htons(ETHERTYPE_IPV6);
200 break;
201#endif
202#ifdef IPX
203 case AF_IPX:
204 if (ef_outputp) {
205 error = ef_outputp(ifp, &m, dst, &type, &hlen);
206 if (error)
207 goto bad;
208 } else
209 type = htons(ETHERTYPE_IPX);
210 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
211 (caddr_t)edst, sizeof (edst));
212 break;
213#endif
214#ifdef NETATALK
215 case AF_APPLETALK:
216 {
217 struct at_ifaddr *aa;
218
219 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
220 goto bad;
221 }
222 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
223 return (0);
224 /*
225 * In the phase 2 case, need to prepend an mbuf for the llc header.
226 * Since we must preserve the value of m, which is passed to us by
227 * value, we m_copy() the first mbuf, and use it for our llc header.
228 */
229 if ( aa->aa_flags & AFA_PHASE2 ) {
230 struct llc llc;
231
74f1caca 232 M_PREPEND(m, sizeof(struct llc), MB_WAIT);
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233 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
234 llc.llc_control = LLC_UI;
235 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
236 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
237 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
238 type = htons(m->m_pkthdr.len);
239 hlen = sizeof(struct llc) + ETHER_HDR_LEN;
240 } else {
241 type = htons(ETHERTYPE_AT);
242 }
243 break;
244 }
245#endif /* NETATALK */
246#ifdef NS
247 case AF_NS:
248 switch(ns_nettype){
249 default:
250 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
251 type = 0x8137;
252 break;
253 case 0x0: /* Novell 802.3 */
254 type = htons( m->m_pkthdr.len);
255 break;
256 case 0xe0e0: /* Novell 802.2 and Token-Ring */
74f1caca 257 M_PREPEND(m, 3, MB_WAIT);
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258 type = htons( m->m_pkthdr.len);
259 cp = mtod(m, u_char *);
260 *cp++ = 0xE0;
261 *cp++ = 0xE0;
262 *cp++ = 0x03;
263 break;
264 }
265 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),
266 (caddr_t)edst, sizeof (edst));
267 /*
268 * XXX if ns_thishost is the same as the node's ethernet
269 * address then just the default code will catch this anyhow.
270 * So I'm not sure if this next clause should be here at all?
271 * [JRE]
272 */
273 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){
274 m->m_pkthdr.rcvif = ifp;
8bde602d 275 netisr_dispatch(NETISR_NS, m);
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276 return (error);
277 }
278 if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){
279 m->m_flags |= M_BCAST;
280 }
281 break;
282#endif /* NS */
283
284 case pseudo_AF_HDRCMPLT:
285 hdrcmplt = 1;
286 eh = (struct ether_header *)dst->sa_data;
287 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
288 /* FALLTHROUGH */
289
290 case AF_UNSPEC:
291 loop_copy = -1; /* if this is for us, don't do it */
292 eh = (struct ether_header *)dst->sa_data;
293 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
294 type = eh->ether_type;
295 break;
296
297 default:
3e4a09e7 298 printf("%s: can't handle af%d\n", ifp->if_xname,
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299 dst->sa_family);
300 senderr(EAFNOSUPPORT);
301 }
302
303 /*
304 * Add local net header. If no space in first mbuf,
305 * allocate another.
306 */
74f1caca 307 M_PREPEND(m, sizeof (struct ether_header), MB_DONTWAIT);
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308 if (m == 0)
309 senderr(ENOBUFS);
310 eh = mtod(m, struct ether_header *);
311 (void)memcpy(&eh->ether_type, &type,
312 sizeof(eh->ether_type));
313 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
314 if (hdrcmplt)
315 (void)memcpy(eh->ether_shost, esrc,
316 sizeof(eh->ether_shost));
317 else
318 (void)memcpy(eh->ether_shost, ac->ac_enaddr,
319 sizeof(eh->ether_shost));
320
321 /*
322 * If a simplex interface, and the packet is being sent to our
323 * Ethernet address or a broadcast address, loopback a copy.
324 * XXX To make a simplex device behave exactly like a duplex
325 * device, we should copy in the case of sending to our own
326 * ethernet address (thus letting the original actually appear
327 * on the wire). However, we don't do that here for security
328 * reasons and compatibility with the original behavior.
329 */
330 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
331 int csum_flags = 0;
332
333 if (m->m_pkthdr.csum_flags & CSUM_IP)
334 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
335 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
336 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
337 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
338 struct mbuf *n;
339
340 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
341 n->m_pkthdr.csum_flags |= csum_flags;
342 if (csum_flags & CSUM_DATA_VALID)
343 n->m_pkthdr.csum_data = 0xffff;
344 (void)if_simloop(ifp, n, dst->sa_family, hlen);
345 } else
346 ifp->if_iqdrops++;
347 } else if (bcmp(eh->ether_dhost,
348 eh->ether_shost, ETHER_ADDR_LEN) == 0) {
349 m->m_pkthdr.csum_flags |= csum_flags;
350 if (csum_flags & CSUM_DATA_VALID)
351 m->m_pkthdr.csum_data = 0xffff;
352 (void) if_simloop(ifp, m, dst->sa_family, hlen);
353 return (0); /* XXX */
354 }
355 }
356
357 /* Handle ng_ether(4) processing, if any */
358 if (ng_ether_output_p != NULL) {
359 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
360bad: if (m != NULL)
361 m_freem(m);
362 return (error);
363 }
364 if (m == NULL)
365 return (0);
366 }
367
368 /* Continue with link-layer output */
369 return ether_output_frame(ifp, m);
370}
371
372/*
373 * Ethernet link layer output routine to send a raw frame to the device.
374 *
375 * This assumes that the 14 byte Ethernet header is present and contiguous
376 * in the first mbuf (if BRIDGE'ing).
377 */
378int
379ether_output_frame(ifp, m)
380 struct ifnet *ifp;
381 struct mbuf *m;
382{
383 int error = 0;
384 int s;
385 struct ip_fw *rule = NULL;
386
387 /* Extract info from dummynet tag, ignore others */
388 for (; m->m_type == MT_TAG; m = m->m_next)
389 if (m->m_flags == PACKET_TAG_DUMMYNET)
390 rule = ((struct dn_pkt *)m)->rule;
391
392 if (rule) /* packet was already bridged */
393 goto no_bridge;
394
395 if (BDG_ACTIVE(ifp) ) {
396 struct ether_header *eh; /* a ptr suffices */
397
398 m->m_pkthdr.rcvif = NULL;
399 eh = mtod(m, struct ether_header *);
400 m_adj(m, ETHER_HDR_LEN);
401 m = bdg_forward_ptr(m, eh, ifp);
402 if (m != NULL)
403 m_freem(m);
404 return (0);
405 }
406
407no_bridge:
408 s = splimp();
409 if (IPFW_LOADED && ether_ipfw != 0) {
410 struct ether_header save_eh, *eh;
411
412 eh = mtod(m, struct ether_header *);
413 save_eh = *eh;
414 m_adj(m, ETHER_HDR_LEN);
415 if (ether_ipfw_chk(&m, ifp, &rule, eh, 0) == 0) {
416 if (m) {
417 m_freem(m);
418 return ENOBUFS; /* pkt dropped */
419 } else
420 return 0; /* consumed e.g. in a pipe */
421 }
422 /* packet was ok, restore the ethernet header */
423 if ( (void *)(eh + 1) == (void *)m->m_data) {
424 m->m_data -= ETHER_HDR_LEN ;
425 m->m_len += ETHER_HDR_LEN ;
426 m->m_pkthdr.len += ETHER_HDR_LEN ;
427 } else {
74f1caca 428 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
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429 if (m == NULL) /* nope... */
430 return ENOBUFS;
431 bcopy(&save_eh, mtod(m, struct ether_header *),
432 ETHER_HDR_LEN);
433 }
434 }
435
436 /*
437 * Queue message on interface, update output statistics if
438 * successful, and start output if interface not yet active.
439 */
440 if (!IF_HANDOFF(&ifp->if_snd, m, ifp))
441 error = ENOBUFS;
442 splx(s);
443 return (error);
444}
445
446/*
447 * ipfw processing for ethernet packets (in and out).
448 * The second parameter is NULL from ether_demux, and ifp from
449 * ether_output_frame. This section of code could be used from
450 * bridge.c as well as long as we use some extra info
451 * to distinguish that case from ether_output_frame();
452 */
453int
454ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
455 struct ip_fw **rule, struct ether_header *eh, int shared)
456{
457 struct ether_header save_eh = *eh; /* might be a ptr in m */
458 int i;
459 struct ip_fw_args args;
460
461 if (*rule != NULL && fw_one_pass)
462 return 1; /* dummynet packet, already partially processed */
463
464 /*
465 * I need some amt of data to be contiguous, and in case others need
466 * the packet (shared==1) also better be in the first mbuf.
467 */
468 i = min( (*m0)->m_pkthdr.len, max_protohdr);
469 if ( shared || (*m0)->m_len < i) {
470 *m0 = m_pullup(*m0, i);
471 if (*m0 == NULL)
472 return 0;
473 }
474
475 args.m = *m0; /* the packet we are looking at */
476 args.oif = dst; /* destination, if any */
477 args.divert_rule = 0; /* we do not support divert yet */
478 args.rule = *rule; /* matching rule to restart */
479 args.next_hop = NULL; /* we do not support forward yet */
480 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
481 i = ip_fw_chk_ptr(&args);
482 *m0 = args.m;
483 *rule = args.rule;
484
485 if ( (i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */
486 return 0;
487
488 if (i == 0) /* a PASS rule. */
489 return 1;
490
491 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) {
492 /*
493 * Pass the pkt to dummynet, which consumes it.
494 * If shared, make a copy and keep the original.
495 */
496 struct mbuf *m ;
497
498 if (shared) {
74f1caca 499 m = m_copypacket(*m0, MB_DONTWAIT);
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500 if (m == NULL)
501 return 0;
502 } else {
503 m = *m0 ; /* pass the original to dummynet */
504 *m0 = NULL ; /* and nothing back to the caller */
505 }
506 /*
507 * Prepend the header, optimize for the common case of
508 * eh pointing into the mbuf.
509 */
510 if ( (void *)(eh + 1) == (void *)m->m_data) {
511 m->m_data -= ETHER_HDR_LEN ;
512 m->m_len += ETHER_HDR_LEN ;
513 m->m_pkthdr.len += ETHER_HDR_LEN ;
514 } else {
74f1caca 515 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT);
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516 if (m == NULL) /* nope... */
517 return 0;
518 bcopy(&save_eh, mtod(m, struct ether_header *),
519 ETHER_HDR_LEN);
520 }
521 ip_dn_io_ptr(m, (i & 0xffff),
522 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
523 return 0;
524 }
525 /*
526 * XXX at some point add support for divert/forward actions.
527 * If none of the above matches, we have to drop the pkt.
528 */
529 return 0;
530}
531
532/*
533 * Process a received Ethernet packet. We have two different interfaces:
534 * one (conventional) assumes the packet in the mbuf, with the ethernet
535 * header provided separately in *eh. The second one (new) has everything
536 * in the mbuf, and we can tell it because eh == NULL.
537 * The caller MUST MAKE SURE that there are at least
538 * sizeof(struct ether_header) bytes in the first mbuf.
539 *
540 * This allows us to concentrate in one place a bunch of code which
541 * is replicated in all device drivers. Also, many functions called
542 * from ether_input() try to put the eh back into the mbuf, so we
543 * can later propagate the 'contiguous packet' interface to them,
544 * and handle the old interface just here.
545 *
546 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or
547 * cluster, right before m_data. So be very careful when working on m,
548 * as you could destroy *eh !!
549 *
550 * First we perform any link layer operations, then continue
551 * to the upper layers with ether_demux().
552 */
553void
554ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
555{
556 struct ether_header save_eh;
557
558 if (eh == NULL) {
559 if (m->m_len < sizeof(struct ether_header)) {
560 /* XXX error in the caller. */
561 m_freem(m);
562 return;
563 }
564 m->m_pkthdr.rcvif = ifp;
565 eh = mtod(m, struct ether_header *);
566 m->m_data += sizeof(struct ether_header);
567 m->m_len -= sizeof(struct ether_header);
568 m->m_pkthdr.len = m->m_len;
569 }
570
571 /* Check for a BPF tap */
572 if (ifp->if_bpf != NULL) {
573 struct m_hdr mh;
574
575 /* This kludge is OK; BPF treats the "mbuf" as read-only */
576 mh.mh_next = m;
577 mh.mh_data = (char *)eh;
578 mh.mh_len = ETHER_HDR_LEN;
579 bpf_mtap(ifp, (struct mbuf *)&mh);
580 }
581
582 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
583
584 /* Handle ng_ether(4) processing, if any */
585 if (ng_ether_input_p != NULL) {
586 (*ng_ether_input_p)(ifp, &m, eh);
587 if (m == NULL)
588 return;
589 }
590
591 /* Check for bridging mode */
592 if (BDG_ACTIVE(ifp) ) {
593 struct ifnet *bif;
594
595 /* Check with bridging code */
596 if ((bif = bridge_in_ptr(ifp, eh)) == BDG_DROP) {
597 m_freem(m);
598 return;
599 }
600 if (bif != BDG_LOCAL) {
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601 save_eh = *eh ; /* because it might change */
602 m = bdg_forward_ptr(m, eh, bif); /* needs forwarding */
603 /*
604 * Do not continue if bdg_forward_ptr() processed our
605 * packet (and cleared the mbuf pointer m) or if
606 * it dropped (m_free'd) the packet itself.
607 */
608 if (m == NULL) {
609 if (bif == BDG_BCAST || bif == BDG_MCAST)
610 printf("bdg_forward drop MULTICAST PKT\n");
611 return;
612 }
613 eh = &save_eh ;
614 }
615 if (bif == BDG_LOCAL
616 || bif == BDG_BCAST
617 || bif == BDG_MCAST)
618 goto recvLocal; /* receive locally */
619
620 /* If not local and not multicast, just drop it */
621 if (m != NULL)
622 m_freem(m);
623 return;
624 }
625
626recvLocal:
627 /* Continue with upper layer processing */
628 ether_demux(ifp, eh, m);
629}
630
631/*
632 * Upper layer processing for a received Ethernet packet.
633 */
634void
635ether_demux(ifp, eh, m)
636 struct ifnet *ifp;
637 struct ether_header *eh;
638 struct mbuf *m;
639{
8bde602d 640 int isr;
984263bc
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641 u_short ether_type;
642#if defined(NETATALK)
82ed7fc2 643 struct llc *l;
984263bc
MD
644#endif
645 struct ip_fw *rule = NULL;
646
647 /* Extract info from dummynet tag, ignore others */
648 for (;m->m_type == MT_TAG; m = m->m_next)
649 if (m->m_flags == PACKET_TAG_DUMMYNET) {
650 rule = ((struct dn_pkt *)m)->rule;
651 ifp = m->m_next->m_pkthdr.rcvif;
652 }
653
654 if (rule) /* packet was already bridged */
655 goto post_stats;
656
657 if (! (BDG_ACTIVE(ifp) ) )
658 /* Discard packet if upper layers shouldn't see it because it was
659 unicast to a different Ethernet address. If the driver is working
660 properly, then this situation can only happen when the interface
661 is in promiscuous mode. */
662 if ((ifp->if_flags & IFF_PROMISC) != 0
663 && (eh->ether_dhost[0] & 1) == 0
664 && bcmp(eh->ether_dhost,
665 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0
46f25451 666 && (ifp->if_flags & IFF_PPROMISC) == 0) {
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667 m_freem(m);
668 return;
669 }
670
671 /* Discard packet if interface is not up */
672 if ((ifp->if_flags & IFF_UP) == 0) {
673 m_freem(m);
674 return;
675 }
676 if (eh->ether_dhost[0] & 1) {
677 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
678 sizeof(etherbroadcastaddr)) == 0)
679 m->m_flags |= M_BCAST;
680 else
681 m->m_flags |= M_MCAST;
682 }
683 if (m->m_flags & (M_BCAST|M_MCAST))
684 ifp->if_imcasts++;
685
686post_stats:
687 if (IPFW_LOADED && ether_ipfw != 0) {
688 if (ether_ipfw_chk(&m, NULL, &rule, eh, 0 ) == 0) {
689 if (m)
690 m_freem(m);
691 return;
692 }
693 }
694
695 ether_type = ntohs(eh->ether_type);
696
697 switch (ether_type) {
698#ifdef INET
699 case ETHERTYPE_IP:
700 if (ipflow_fastforward(m))
701 return;
8bde602d 702 isr = NETISR_IP;
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703 break;
704
705 case ETHERTYPE_ARP:
706 if (ifp->if_flags & IFF_NOARP) {
707 /* Discard packet if ARP is disabled on interface */
708 m_freem(m);
709 return;
710 }
8bde602d 711 isr = NETISR_ARP;
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712 break;
713#endif
714#ifdef IPX
715 case ETHERTYPE_IPX:
716 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
717 return;
8bde602d 718 isr = NETISR_IPX;
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MD
719 break;
720#endif
721#ifdef INET6
722 case ETHERTYPE_IPV6:
8bde602d 723 isr = NETISR_IPV6;
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724 break;
725#endif
726#ifdef NS
727 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
8bde602d 728 isr = NETISR_NS;
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729 break;
730
731#endif /* NS */
732#ifdef NETATALK
733 case ETHERTYPE_AT:
8bde602d 734 isr = NETISR_ATALK1;
984263bc
MD
735 break;
736 case ETHERTYPE_AARP:
8bde602d
JH
737 isr = NETISR_AARP;
738 break;
984263bc
MD
739#endif /* NETATALK */
740 case ETHERTYPE_VLAN:
741 /* XXX lock ? */
742 if (vlan_input_p != NULL)
743 (*vlan_input_p)(eh, m);
744 else {
745 m->m_pkthdr.rcvif->if_noproto++;
746 m_freem(m);
747 }
748 /* XXX unlock ? */
749 return;
750 default:
751#ifdef IPX
752 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
753 return;
754#endif /* IPX */
755#ifdef NS
756 checksum = mtod(m, ushort *);
757 /* Novell 802.3 */
758 if ((ether_type <= ETHERMTU) &&
8bde602d
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759 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) {
760 if (*checksum == 0xE0E0) {
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761 m->m_pkthdr.len -= 3;
762 m->m_len -= 3;
763 m->m_data += 3;
764 }
8bde602d
JH
765 isr = NETISR_NS;
766 break;
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MD
767 }
768#endif /* NS */
8bde602d 769#ifdef NETATALK
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770 if (ether_type > ETHERMTU)
771 goto dropanyway;
772 l = mtod(m, struct llc *);
8bde602d
JH
773 if (l->llc_dsap == LLC_SNAP_LSAP &&
774 l->llc_ssap == LLC_SNAP_LSAP &&
775 l->llc_control == LLC_UI) {
776 if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code,
777 sizeof(at_org_code)) == 0 &&
778 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
779 m_adj(m, sizeof(struct llc));
780 isr = NETISR_ATALK2;
781 break;
984263bc 782 }
984263bc 783 if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
8bde602d
JH
784 sizeof(aarp_org_code)) == 0 &&
785 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
786 m_adj(m, sizeof(struct llc));
787 isr = NETISR_AARP;
788 break;
984263bc 789 }
984263bc 790 }
8bde602d
JH
791dropanyway:
792#endif /* NETATALK */
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793 if (ng_ether_input_orphan_p != NULL)
794 (*ng_ether_input_orphan_p)(ifp, m, eh);
795 else
796 m_freem(m);
797 return;
984263bc 798 }
8bde602d 799 netisr_dispatch(isr, m);
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800}
801
802/*
803 * Perform common duties while attaching to interface list
804 */
c0f6c904 805
984263bc 806void
0a8b5977 807ether_ifattach(struct ifnet *ifp, uint8_t *lla)
c0f6c904
JS
808{
809 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header));
810}
811
812void
813ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen)
984263bc 814{
82ed7fc2
RG
815 struct ifaddr *ifa;
816 struct sockaddr_dl *sdl;
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817
818 ifp->if_type = IFT_ETHER;
819 ifp->if_addrlen = 6;
820 ifp->if_hdrlen = 14;
821 if_attach(ifp);
822 ifp->if_mtu = ETHERMTU;
823 ifp->if_resolvemulti = ether_resolvemulti;
824 if (ifp->if_baudrate == 0)
825 ifp->if_baudrate = 10000000;
826 ifa = ifnet_addrs[ifp->if_index - 1];
827 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__));
828 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
829 sdl->sdl_type = IFT_ETHER;
830 sdl->sdl_alen = ifp->if_addrlen;
0a8b5977 831 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
c568d5be
JS
832 /*
833 * XXX Keep the current drivers happy.
834 * XXX Remove once all drivers have been cleaned up
835 */
836 if (lla != IFP2AC(ifp)->ac_enaddr)
837 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
c0f6c904 838 bpfattach(ifp, dlt, hdrlen);
984263bc
MD
839 if (ng_ether_attach_p != NULL)
840 (*ng_ether_attach_p)(ifp);
841 if (BDG_LOADED)
842 bdgtakeifaces_ptr();
267caeeb
JS
843
844 if_printf(ifp, "MAC address: %6D\n", lla, ":");
984263bc
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845}
846
847/*
848 * Perform common duties while detaching an Ethernet interface
849 */
850void
0a8b5977 851ether_ifdetach(struct ifnet *ifp)
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852{
853 if (ng_ether_detach_p != NULL)
854 (*ng_ether_detach_p)(ifp);
0a8b5977 855 bpfdetach(ifp);
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856 if_detach(ifp);
857 if (BDG_LOADED)
858 bdgtakeifaces_ptr();
859}
860
861SYSCTL_DECL(_net_link);
862SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
863SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
864 &ether_ipfw,0,"Pass ether pkts through firewall");
865
866int
867ether_ioctl(ifp, command, data)
868 struct ifnet *ifp;
869 int command;
870 caddr_t data;
871{
872 struct ifaddr *ifa = (struct ifaddr *) data;
873 struct ifreq *ifr = (struct ifreq *) data;
874 int error = 0;
875
876 switch (command) {
877 case SIOCSIFADDR:
878 ifp->if_flags |= IFF_UP;
879
880 switch (ifa->ifa_addr->sa_family) {
881#ifdef INET
882 case AF_INET:
883 ifp->if_init(ifp->if_softc); /* before arpwhohas */
884 arp_ifinit(ifp, ifa);
885 break;
886#endif
887#ifdef IPX
888 /*
889 * XXX - This code is probably wrong
890 */
891 case AF_IPX:
892 {
82ed7fc2 893 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
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894 struct arpcom *ac = IFP2AC(ifp);
895
896 if (ipx_nullhost(*ina))
897 ina->x_host =
898 *(union ipx_host *)
899 ac->ac_enaddr;
900 else {
901 bcopy((caddr_t) ina->x_host.c_host,
902 (caddr_t) ac->ac_enaddr,
903 sizeof(ac->ac_enaddr));
904 }
905
906 /*
907 * Set new address
908 */
909 ifp->if_init(ifp->if_softc);
910 break;
911 }
912#endif
913#ifdef NS
914 /*
915 * XXX - This code is probably wrong
916 */
917 case AF_NS:
918 {
82ed7fc2 919 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
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920 struct arpcom *ac = IFP2AC(ifp);
921
922 if (ns_nullhost(*ina))
923 ina->x_host =
924 *(union ns_host *) (ac->ac_enaddr);
925 else {
926 bcopy((caddr_t) ina->x_host.c_host,
927 (caddr_t) ac->ac_enaddr,
928 sizeof(ac->ac_enaddr));
929 }
930
931 /*
932 * Set new address
933 */
934 ifp->if_init(ifp->if_softc);
935 break;
936 }
937#endif
938 default:
939 ifp->if_init(ifp->if_softc);
940 break;
941 }
942 break;
943
944 case SIOCGIFADDR:
945 {
946 struct sockaddr *sa;
947
948 sa = (struct sockaddr *) & ifr->ifr_data;
949 bcopy(IFP2AC(ifp)->ac_enaddr,
950 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
951 }
952 break;
953
954 case SIOCSIFMTU:
955 /*
956 * Set the interface MTU.
957 */
958 if (ifr->ifr_mtu > ETHERMTU) {
959 error = EINVAL;
960 } else {
961 ifp->if_mtu = ifr->ifr_mtu;
962 }
963 break;
c2d9fd91
JS
964 default:
965 error = EINVAL;
966 break;
984263bc
MD
967 }
968 return (error);
969}
970
971int
972ether_resolvemulti(ifp, llsa, sa)
973 struct ifnet *ifp;
974 struct sockaddr **llsa;
975 struct sockaddr *sa;
976{
977 struct sockaddr_dl *sdl;
978 struct sockaddr_in *sin;
979#ifdef INET6
980 struct sockaddr_in6 *sin6;
981#endif
982 u_char *e_addr;
983
984 switch(sa->sa_family) {
985 case AF_LINK:
986 /*
987 * No mapping needed. Just check that it's a valid MC address.
988 */
989 sdl = (struct sockaddr_dl *)sa;
990 e_addr = LLADDR(sdl);
991 if ((e_addr[0] & 1) != 1)
992 return EADDRNOTAVAIL;
993 *llsa = 0;
994 return 0;
995
996#ifdef INET
997 case AF_INET:
998 sin = (struct sockaddr_in *)sa;
999 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1000 return EADDRNOTAVAIL;
1001 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1002 M_WAITOK|M_ZERO);
1003 sdl->sdl_len = sizeof *sdl;
1004 sdl->sdl_family = AF_LINK;
1005 sdl->sdl_index = ifp->if_index;
1006 sdl->sdl_type = IFT_ETHER;
1007 sdl->sdl_alen = ETHER_ADDR_LEN;
1008 e_addr = LLADDR(sdl);
1009 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1010 *llsa = (struct sockaddr *)sdl;
1011 return 0;
1012#endif
1013#ifdef INET6
1014 case AF_INET6:
1015 sin6 = (struct sockaddr_in6 *)sa;
1016 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1017 /*
1018 * An IP6 address of 0 means listen to all
1019 * of the Ethernet multicast address used for IP6.
1020 * (This is used for multicast routers.)
1021 */
1022 ifp->if_flags |= IFF_ALLMULTI;
1023 *llsa = 0;
1024 return 0;
1025 }
1026 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1027 return EADDRNOTAVAIL;
1028 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
1029 M_WAITOK|M_ZERO);
1030 sdl->sdl_len = sizeof *sdl;
1031 sdl->sdl_family = AF_LINK;
1032 sdl->sdl_index = ifp->if_index;
1033 sdl->sdl_type = IFT_ETHER;
1034 sdl->sdl_alen = ETHER_ADDR_LEN;
1035 e_addr = LLADDR(sdl);
1036 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1037 *llsa = (struct sockaddr *)sdl;
1038 return 0;
1039#endif
1040
1041 default:
1042 /*
1043 * Well, the text isn't quite right, but it's the name
1044 * that counts...
1045 */
1046 return EAFNOSUPPORT;
1047 }
1048}