Change a 'char *' to a 'void *' because that field is not accessed
[dragonfly.git] / sys / netinet / if_ether.c
CommitLineData
f3ed2586
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1/*
2 * Copyright (c) 2004, 2005 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Jeffrey M. Hsu.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of The DragonFly Project nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific, prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33/*
34 * Copyright (c) 2004, 2005 Jeffrey M. Hsu. All rights reserved.
35 *
36 * License terms: all terms for the DragonFly license above plus the following:
37 *
38 * 4. All advertising materials mentioning features or use of this software
39 * must display the following acknowledgement:
40 *
41 * This product includes software developed by Jeffrey M. Hsu
42 * for the DragonFly Project.
43 *
44 * This requirement may be waived with permission from Jeffrey Hsu.
45 * Permission will be granted to any DragonFly user for free.
46 * This requirement will sunset and may be removed on Jan 31, 2006,
47 * after which the standard DragonFly license (as shown above) will
48 * apply.
49 */
50
984263bc
MD
51/*
52 * Copyright (c) 1982, 1986, 1988, 1993
53 * The Regents of the University of California. All rights reserved.
54 *
55 * Redistribution and use in source and binary forms, with or without
56 * modification, are permitted provided that the following conditions
57 * are met:
58 * 1. Redistributions of source code must retain the above copyright
59 * notice, this list of conditions and the following disclaimer.
60 * 2. Redistributions in binary form must reproduce the above copyright
61 * notice, this list of conditions and the following disclaimer in the
62 * documentation and/or other materials provided with the distribution.
63 * 3. All advertising materials mentioning features or use of this software
64 * must display the following acknowledgement:
65 * This product includes software developed by the University of
66 * California, Berkeley and its contributors.
67 * 4. Neither the name of the University nor the names of its contributors
68 * may be used to endorse or promote products derived from this software
69 * without specific prior written permission.
70 *
71 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
72 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
73 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
74 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
75 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
76 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
77 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
78 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
79 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
80 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
81 * SUCH DAMAGE.
82 *
83 * @(#)if_ether.c 8.1 (Berkeley) 6/10/93
84 * $FreeBSD: src/sys/netinet/if_ether.c,v 1.64.2.23 2003/04/11 07:23:15 fjoe Exp $
ac0fa530 85 * $DragonFly: src/sys/netinet/if_ether.c,v 1.25 2005/01/23 06:41:55 hsu Exp $
984263bc
MD
86 */
87
88/*
89 * Ethernet address resolution protocol.
90 * TODO:
91 * add "inuse/lock" bit (or ref. count) along with valid bit
92 */
93
94#include "opt_inet.h"
95#include "opt_bdg.h"
96
97#include <sys/param.h>
98#include <sys/kernel.h>
99#include <sys/queue.h>
100#include <sys/sysctl.h>
101#include <sys/systm.h>
102#include <sys/mbuf.h>
103#include <sys/malloc.h>
104#include <sys/socket.h>
105#include <sys/syslog.h>
106
a80cf23b
JH
107#include <sys/thread2.h>
108#include <sys/msgport2.h>
109
984263bc
MD
110#include <net/if.h>
111#include <net/if_dl.h>
112#include <net/if_types.h>
113#include <net/route.h>
114#include <net/netisr.h>
115#include <net/if_llc.h>
116#ifdef BRIDGE
117#include <net/ethernet.h>
d2438d69 118#include <net/bridge/bridge.h>
984263bc
MD
119#endif
120
121#include <netinet/in.h>
122#include <netinet/in_var.h>
123#include <netinet/if_ether.h>
124
125#include <net/if_arc.h>
126#include <net/iso88025.h>
127
128#define SIN(s) ((struct sockaddr_in *)s)
129#define SDL(s) ((struct sockaddr_dl *)s)
130
131SYSCTL_DECL(_net_link_ether);
132SYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, "");
133
134/* timer values */
135static int arpt_prune = (5*60*1); /* walk list every 5 minutes */
136static int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */
137static int arpt_down = 20; /* once declared down, don't send for 20 sec */
138
139SYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW,
140 &arpt_prune, 0, "");
f23061d4 141SYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW,
984263bc
MD
142 &arpt_keep, 0, "");
143SYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW,
144 &arpt_down, 0, "");
145
f23061d4 146#define rt_expire rt_rmx.rmx_expire
984263bc
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147
148struct llinfo_arp {
149 LIST_ENTRY(llinfo_arp) la_le;
150 struct rtentry *la_rt;
151 struct mbuf *la_hold; /* last packet until resolved/timeout */
a916e847 152 u_short la_preempt; /* countdown for pre-expiry arps */
984263bc 153 u_short la_asked; /* #times we QUERIED following expiration */
984263bc
MD
154};
155
156static LIST_HEAD(, llinfo_arp) llinfo_arp;
157
984263bc
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158static int arp_maxtries = 5;
159static int useloopback = 1; /* use loopback interface for local traffic */
160static int arp_proxyall = 0;
161
162SYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW,
163 &arp_maxtries, 0, "");
164SYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW,
165 &useloopback, 0, "");
166SYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW,
167 &arp_proxyall, 0, "");
168
42a7fc75
RG
169static void arp_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
170static void arprequest (struct ifnet *,
171 struct in_addr *, struct in_addr *, u_char *);
b76bed62 172static int arpintr(struct netmsg *);
42a7fc75
RG
173static void arptfree (struct llinfo_arp *);
174static void arptimer (void *);
984263bc 175static struct llinfo_arp
f23061d4 176 *arplookup (in_addr_t addr, boolean_t create, boolean_t proxy);
984263bc 177#ifdef INET
42a7fc75 178static void in_arpinput (struct mbuf *);
984263bc
MD
179#endif
180
ac311540
JS
181static struct callout arptimer_ch;
182
984263bc
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183/*
184 * Timeout routine. Age arp_tab entries periodically.
185 */
186/* ARGSUSED */
187static void
f23061d4 188arptimer(void *ignored_arg)
984263bc
MD
189{
190 int s = splnet();
2e9572df 191 struct llinfo_arp *la, *nla;
984263bc 192
2e9572df
JH
193 LIST_FOREACH_MUTABLE(la, &llinfo_arp, la_le, nla) {
194 if (la->la_rt->rt_expire && la->la_rt->rt_expire <= time_second)
195 arptfree(la); /* might remove la from llinfo_arp! */
984263bc 196 }
ac311540 197 callout_reset(&arptimer_ch, arpt_prune * hz, arptimer, NULL);
984263bc
MD
198 splx(s);
199}
200
201/*
202 * Parallel to llc_rtrequest.
203 */
204static void
f23061d4 205arp_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
984263bc 206{
2256ba69 207 struct sockaddr *gate = rt->rt_gateway;
f23061d4
JH
208 struct llinfo_arp *la = rt->rt_llinfo;
209
5fe66e68 210 struct sockaddr_dl null_sdl = { sizeof null_sdl, AF_LINK };
f23061d4
JH
211 static boolean_t arpinit_done;
212 static int arp_inuse, arp_allocated; /* for debugging only */
984263bc
MD
213
214 if (!arpinit_done) {
f23061d4 215 arpinit_done = TRUE;
ac311540
JS
216 callout_init(&arptimer_ch);
217 callout_reset(&arptimer_ch, hz, arptimer, NULL);
984263bc
MD
218 }
219 if (rt->rt_flags & RTF_GATEWAY)
220 return;
984263bc 221
f23061d4 222 switch (req) {
984263bc
MD
223 case RTM_ADD:
224 /*
225 * XXX: If this is a manually added route to interface
226 * such as older version of routed or gated might provide,
227 * restore cloning bit.
228 */
f23061d4 229 if (!(rt->rt_flags & RTF_HOST) &&
984263bc
MD
230 SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
231 rt->rt_flags |= RTF_CLONING;
232 if (rt->rt_flags & RTF_CLONING) {
233 /*
234 * Case 1: This route should come from a route to iface.
235 */
236 rt_setgate(rt, rt_key(rt),
0c3c561c 237 (struct sockaddr *)&null_sdl);
984263bc
MD
238 gate = rt->rt_gateway;
239 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
240 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
241 rt->rt_expire = time_second;
242 break;
243 }
244 /* Announce a new entry if requested. */
245 if (rt->rt_flags & RTF_ANNOUNCE)
246 arprequest(rt->rt_ifp,
247 &SIN(rt_key(rt))->sin_addr,
248 &SIN(rt_key(rt))->sin_addr,
f23061d4 249 LLADDR(SDL(gate)));
984263bc
MD
250 /*FALLTHROUGH*/
251 case RTM_RESOLVE:
252 if (gate->sa_family != AF_LINK ||
f23061d4 253 gate->sa_len < sizeof(struct sockaddr_dl)) {
984263bc
MD
254 log(LOG_DEBUG, "arp_rtrequest: bad gateway value\n");
255 break;
256 }
257 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
258 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
f23061d4 259 if (la != NULL)
984263bc
MD
260 break; /* This happens on a route change */
261 /*
262 * Case 2: This route may come from cloning, or a manual route
263 * add with a LL address.
264 */
0c3c561c 265 R_Malloc(la, struct llinfo_arp *, sizeof *la);
f23061d4
JH
266 rt->rt_llinfo = la;
267 if (la == NULL) {
984263bc
MD
268 log(LOG_DEBUG, "arp_rtrequest: malloc failed\n");
269 break;
270 }
271 arp_inuse++, arp_allocated++;
f23061d4 272 bzero(la, sizeof *la);
984263bc
MD
273 la->la_rt = rt;
274 rt->rt_flags |= RTF_LLINFO;
275 LIST_INSERT_HEAD(&llinfo_arp, la, la_le);
276
277#ifdef INET
278 /*
279 * This keeps the multicast addresses from showing up
280 * in `arp -a' listings as unresolved. It's not actually
281 * functional. Then the same for broadcast.
282 */
f23061d4
JH
283 if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr)) &&
284 rt->rt_ifp->if_type != IFT_ARCNET) {
984263bc
MD
285 ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr,
286 LLADDR(SDL(gate)));
287 SDL(gate)->sdl_alen = 6;
288 rt->rt_expire = 0;
289 }
290 if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) {
c401f0fd 291 memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr,
984263bc
MD
292 rt->rt_ifp->if_addrlen);
293 SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen;
294 rt->rt_expire = 0;
295 }
296#endif
297
298 if (SIN(rt_key(rt))->sin_addr.s_addr ==
299 (IA_SIN(rt->rt_ifa))->sin_addr.s_addr) {
f23061d4
JH
300 /*
301 * This test used to be
302 * if (loif.if_flags & IFF_UP)
303 * It allowed local traffic to be forced
304 * through the hardware by configuring the
305 * loopback down. However, it causes problems
306 * during network configuration for boards
307 * that can't receive packets they send. It
308 * is now necessary to clear "useloopback" and
309 * remove the route to force traffic out to
310 * the hardware.
311 */
984263bc 312 rt->rt_expire = 0;
2e9572df 313 bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)),
984263bc
MD
314 SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen);
315 if (useloopback)
316 rt->rt_ifp = loif;
984263bc
MD
317 }
318 break;
319
320 case RTM_DELETE:
f23061d4 321 if (la == NULL)
984263bc
MD
322 break;
323 arp_inuse--;
324 LIST_REMOVE(la, la_le);
f23061d4 325 rt->rt_llinfo = NULL;
984263bc 326 rt->rt_flags &= ~RTF_LLINFO;
f23061d4 327 if (la->la_hold != NULL)
984263bc 328 m_freem(la->la_hold);
f23061d4 329 Free(la);
984263bc
MD
330 }
331}
332
333/*
334 * Broadcast an ARP request. Caller specifies:
335 * - arp header source ip address
336 * - arp header target ip address
337 * - arp header source ethernet address
338 */
339static void
f23061d4
JH
340arprequest(struct ifnet *ifp, struct in_addr *sip, struct in_addr *tip,
341 u_char *enaddr)
984263bc 342{
2256ba69
RG
343 struct mbuf *m;
344 struct ether_header *eh;
345 struct arc_header *arh;
346 struct arphdr *ah;
984263bc 347 struct sockaddr sa;
f23061d4
JH
348 static u_char llcx[] = { 0x82, 0x40, LLC_SNAP_LSAP, LLC_SNAP_LSAP,
349 LLC_UI, 0x00, 0x00, 0x00, 0x08, 0x06 };
984263bc
MD
350 u_short ar_hrd;
351
74f1caca 352 if ((m = m_gethdr(MB_DONTWAIT, MT_DATA)) == NULL)
984263bc 353 return;
f23061d4
JH
354 m->m_pkthdr.rcvif = (struct ifnet *)NULL;
355
984263bc
MD
356 switch (ifp->if_type) {
357 case IFT_ARCNET:
358 ar_hrd = htons(ARPHRD_ARCNET);
359
360 m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
361 m->m_pkthdr.len = m->m_len;
362 MH_ALIGN(m, m->m_len);
363
364 arh = (struct arc_header *)sa.sa_data;
c401f0fd 365 arh->arc_dhost = ifp->if_broadcastaddr[0];
984263bc
MD
366 arh->arc_type = ARCTYPE_ARP;
367
368 ah = mtod(m, struct arphdr *);
369 break;
370
371 case IFT_ISO88025:
372 ar_hrd = htons(ARPHRD_IEEE802);
373
0c3c561c 374 m->m_len = (sizeof llcx) +
984263bc
MD
375 arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
376 m->m_pkthdr.len = m->m_len;
377 MH_ALIGN(m, m->m_len);
378
0c3c561c 379 memcpy(mtod(m, caddr_t), llcx, sizeof llcx);
c401f0fd 380 memcpy(sa.sa_data, ifp->if_broadcastaddr, ifp->if_addrlen);
f23061d4 381 memcpy(sa.sa_data + 6, enaddr, 6);
984263bc
MD
382 sa.sa_data[6] |= TR_RII;
383 sa.sa_data[12] = TR_AC;
384 sa.sa_data[13] = TR_LLC_FRAME;
385
0c3c561c 386 ah = (struct arphdr *)(mtod(m, char *) + sizeof llcx);
984263bc
MD
387 break;
388 case IFT_FDDI:
389 case IFT_ETHER:
390 /*
391 * This may not be correct for types not explicitly
392 * listed, but this is our best guess
393 */
394 default:
395 ar_hrd = htons(ARPHRD_ETHER);
396
397 m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
398 m->m_pkthdr.len = m->m_len;
399 MH_ALIGN(m, m->m_len);
400
401 eh = (struct ether_header *)sa.sa_data;
f23061d4 402 /* if_output() will not swap */
984263bc 403 eh->ether_type = htons(ETHERTYPE_ARP);
c401f0fd 404 memcpy(eh->ether_dhost, ifp->if_broadcastaddr, ifp->if_addrlen);
984263bc
MD
405
406 ah = mtod(m, struct arphdr *);
407 break;
408 }
409
410 ah->ar_hrd = ar_hrd;
411 ah->ar_pro = htons(ETHERTYPE_IP);
412 ah->ar_hln = ifp->if_addrlen; /* hardware address length */
413 ah->ar_pln = sizeof(struct in_addr); /* protocol address length */
414 ah->ar_op = htons(ARPOP_REQUEST);
f23061d4 415 memcpy(ar_sha(ah), enaddr, ah->ar_hln);
984263bc 416 memset(ar_tha(ah), 0, ah->ar_hln);
f23061d4
JH
417 memcpy(ar_spa(ah), sip, ah->ar_pln);
418 memcpy(ar_tpa(ah), tip, ah->ar_pln);
984263bc
MD
419
420 sa.sa_family = AF_UNSPEC;
0c3c561c 421 sa.sa_len = sizeof sa;
f23061d4 422 (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)NULL);
984263bc
MD
423}
424
425/*
426 * Resolve an IP address into an ethernet address. If success,
427 * desten is filled in. If there is no entry in arptab,
428 * set one up and broadcast a request for the IP address.
429 * Hold onto this mbuf and resend it once the address
430 * is finally resolved. A return value of 1 indicates
431 * that desten has been filled in and the packet should be sent
432 * normally; a 0 return indicates that the packet has been
433 * taken over here, either now or for later transmission.
434 */
435int
f23061d4
JH
436arpresolve(
437 struct ifnet *ifp,
438 struct rtentry *rt0,
439 struct mbuf *m,
440 struct sockaddr *dst,
441 u_char *desten)
984263bc 442{
f23061d4
JH
443 struct rtentry *rt;
444 struct llinfo_arp *la = NULL;
984263bc
MD
445 struct sockaddr_dl *sdl;
446
447 if (m->m_flags & M_BCAST) { /* broadcast */
c401f0fd 448 memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen);
984263bc
MD
449 return (1);
450 }
451 if (m->m_flags & M_MCAST && ifp->if_type != IFT_ARCNET) {/* multicast */
452 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten);
f23061d4 453 return (1);
984263bc 454 }
f23061d4
JH
455 if (rt0 != NULL) {
456 if (rt_llroute(dst, rt0, &rt) != 0) {
457 m_freem(m);
458 return 0;
459 }
460 la = rt->rt_llinfo;
461 }
462 if (la == NULL) {
463 la = arplookup(SIN(dst)->sin_addr.s_addr, TRUE, FALSE);
464 if (la != NULL)
984263bc
MD
465 rt = la->la_rt;
466 }
f23061d4 467 if (la == NULL || rt == NULL) {
984263bc 468 log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n",
5fe66e68
JH
469 inet_ntoa(SIN(dst)->sin_addr), la ? "la" : " ",
470 rt ? "rt" : "");
984263bc
MD
471 m_freem(m);
472 return (0);
473 }
474 sdl = SDL(rt->rt_gateway);
475 /*
476 * Check the address family and length is valid, the address
477 * is resolved; otherwise, try to resolve.
478 */
479 if ((rt->rt_expire == 0 || rt->rt_expire > time_second) &&
480 sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) {
481 /*
482 * If entry has an expiry time and it is approaching,
483 * see if we need to send an ARP request within this
484 * arpt_down interval.
485 */
486 if ((rt->rt_expire != 0) &&
a916e847 487 (time_second + la->la_preempt > rt->rt_expire)) {
984263bc
MD
488 arprequest(ifp,
489 &SIN(rt->rt_ifa->ifa_addr)->sin_addr,
490 &SIN(dst)->sin_addr,
491 IF_LLADDR(ifp));
a916e847 492 la->la_preempt--;
f23061d4 493 }
984263bc
MD
494
495 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
496 return 1;
497 }
498 /*
499 * If ARP is disabled on this interface, stop.
500 * XXX
501 * Probably should not allocate empty llinfo struct if we are
502 * not going to be sending out an arp request.
503 */
504 if (ifp->if_flags & IFF_NOARP) {
505 m_freem(m);
506 return (0);
507 }
508 /*
509 * There is an arptab entry, but no ethernet address
510 * response yet. Replace the held mbuf with this
511 * latest one.
512 */
f23061d4 513 if (la->la_hold != NULL)
984263bc
MD
514 m_freem(la->la_hold);
515 la->la_hold = m;
03f869ef 516 if (rt->rt_expire || ((rt->rt_flags & RTF_STATIC) && !sdl->sdl_alen)) {
984263bc
MD
517 rt->rt_flags &= ~RTF_REJECT;
518 if (la->la_asked == 0 || rt->rt_expire != time_second) {
519 rt->rt_expire = time_second;
520 if (la->la_asked++ < arp_maxtries) {
521 arprequest(ifp,
522 &SIN(rt->rt_ifa->ifa_addr)->sin_addr,
523 &SIN(dst)->sin_addr,
524 IF_LLADDR(ifp));
525 } else {
526 rt->rt_flags |= RTF_REJECT;
527 rt->rt_expire += arpt_down;
a916e847
JH
528 la->la_asked = 0;
529 la->la_preempt = arp_maxtries;
984263bc
MD
530 }
531
532 }
533 }
534 return (0);
535}
536
537/*
538 * Common length and type checks are done here,
539 * then the protocol-specific routine is called.
540 */
b76bed62 541static int
9eeaa8a9 542arpintr(struct netmsg *msg)
984263bc 543{
9eeaa8a9 544 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
2256ba69 545 struct arphdr *ar;
8bde602d 546 u_short ar_hrd;
984263bc 547
8bde602d
JH
548 if (m->m_len < sizeof(struct arphdr) &&
549 ((m = m_pullup(m, sizeof(struct arphdr))) == NULL)) {
550 log(LOG_ERR, "arp: runt packet -- m_pullup failed\n");
b76bed62 551 goto out2;
8bde602d
JH
552 }
553 ar = mtod(m, struct arphdr *);
554
555 ar_hrd = ntohs(ar->ar_hrd);
556 if (ar_hrd != ARPHRD_ETHER &&
557 ar_hrd != ARPHRD_IEEE802 &&
558 ar_hrd != ARPHRD_ARCNET) {
559 log(LOG_ERR,
560 "arp: unknown hardware address format (0x%2D)\n",
561 (unsigned char *)&ar->ar_hrd, "");
b76bed62 562 goto out1;
8bde602d 563 }
984263bc 564
8bde602d
JH
565 if (m->m_pkthdr.len < arphdr_len(ar) &&
566 (m = m_pullup(m, arphdr_len(ar))) == NULL) {
567 log(LOG_ERR, "arp: runt packet\n");
b76bed62 568 goto out1;
8bde602d
JH
569 }
570
571 switch (ntohs(ar->ar_pro)) {
984263bc 572#ifdef INET
8bde602d
JH
573 case ETHERTYPE_IP:
574 in_arpinput(m);
b76bed62 575 goto out2;
984263bc 576#endif
984263bc 577 }
b76bed62 578out1:
8bde602d 579 m_freem(m);
b76bed62 580out2:
a80cf23b 581 lwkt_replymsg(&msg->nm_lmsg, 0);
b76bed62 582 return(EASYNC);
984263bc
MD
583}
584
585#ifdef INET
586/*
587 * ARP for Internet protocols on 10 Mb/s Ethernet.
588 * Algorithm is that given in RFC 826.
589 * In addition, a sanity check is performed on the sender
590 * protocol address, to catch impersonators.
591 * We no longer handle negotiations for use of trailer protocol:
592 * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent
593 * along with IP replies if we wanted trailers sent to us,
594 * and also sent them in response to IP replies.
595 * This allowed either end to announce the desire to receive
596 * trailer packets.
597 * We no longer reply to requests for ETHERTYPE_TRAIL protocol either,
598 * but formerly didn't normally send requests.
599 */
600static int log_arp_wrong_iface = 1;
984263bc
MD
601SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW,
602 &log_arp_wrong_iface, 0,
603 "log arp packets arriving on the wrong interface");
604
605static void
f23061d4 606in_arpinput(struct mbuf *m)
984263bc 607{
2256ba69
RG
608 struct arphdr *ah;
609 struct ifnet *ifp = m->m_pkthdr.rcvif;
984263bc
MD
610 struct ether_header *eh;
611 struct arc_header *arh;
5fe66e68 612 struct iso88025_header *th = (struct iso88025_header *)NULL;
984263bc 613 struct iso88025_sockaddr_dl_data *trld;
5fe66e68 614 struct llinfo_arp *la = NULL;
2256ba69 615 struct rtentry *rt;
984263bc
MD
616 struct ifaddr *ifa;
617 struct in_ifaddr *ia;
618 struct sockaddr_dl *sdl;
619 struct sockaddr sa;
620 struct in_addr isaddr, itaddr, myaddr;
621 int op, rif_len;
622 int req_len;
623
624 req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
625 if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) {
626 log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n");
627 return;
628 }
629
630 ah = mtod(m, struct arphdr *);
631 op = ntohs(ah->ar_op);
f23061d4
JH
632 memcpy(&isaddr, ar_spa(ah), sizeof isaddr);
633 memcpy(&itaddr, ar_tpa(ah), sizeof itaddr);
984263bc
MD
634#ifdef BRIDGE
635#define BRIDGE_TEST (do_bridge)
636#else
637#define BRIDGE_TEST (0) /* cc will optimise the test away */
638#endif
639 /*
640 * For a bridge, we want to check the address irrespective
641 * of the receive interface. (This will change slightly
642 * when we have clusters of interfaces).
643 */
644 LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash)
645 if ((BRIDGE_TEST || (ia->ia_ifp == ifp)) &&
646 itaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
647 goto match;
648 LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash)
649 if ((BRIDGE_TEST || (ia->ia_ifp == ifp)) &&
650 isaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
651 goto match;
652 /*
653 * No match, use the first inet address on the receive interface
654 * as a dummy address for the rest of the function.
655 */
656 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
657 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
658 ia = ifatoia(ifa);
659 goto match;
660 }
661 /*
662 * If bridging, fall back to using any inet address.
663 * This is probably incorrect, the right way being try to match
664 * addresses for interfaces in the same cluster, so if we
665 * get here we should always drop the packet.
666 */
667 if (!BRIDGE_TEST ||
668 (ia = TAILQ_FIRST(&in_ifaddrhead)) == NULL) {
669 m_freem(m);
670 return;
671 }
672match:
673 myaddr = ia->ia_addr.sin_addr;
674 if (!bcmp(ar_sha(ah), IF_LLADDR(ifp), ifp->if_addrlen)) {
675 m_freem(m); /* it's from me, ignore it. */
676 return;
677 }
c401f0fd 678 if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) {
984263bc
MD
679 log(LOG_ERR,
680 "arp: link address is broadcast for IP address %s!\n",
681 inet_ntoa(isaddr));
682 m_freem(m);
683 return;
684 }
c3749f74 685 if (isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) {
984263bc
MD
686 log(LOG_ERR,
687 "arp: %*D is using my IP address %s!\n",
688 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
689 inet_ntoa(isaddr));
690 itaddr = myaddr;
691 goto reply;
692 }
f23061d4 693 la = arplookup(isaddr.s_addr, (itaddr.s_addr == myaddr.s_addr), FALSE);
984263bc
MD
694 if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) {
695 /* the following is not an error when doing bridging */
696 if (!BRIDGE_TEST && rt->rt_ifp != ifp) {
697 if (log_arp_wrong_iface)
f23061d4
JH
698 log(LOG_ERR,
699 "arp: %s is on %s but got reply from %*D on %s\n",
984263bc 700 inet_ntoa(isaddr),
3e4a09e7 701 rt->rt_ifp->if_xname,
984263bc 702 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
3e4a09e7 703 ifp->if_xname);
984263bc
MD
704 goto reply;
705 }
706 if (sdl->sdl_alen &&
707 bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) {
708 if (rt->rt_expire)
f23061d4
JH
709 log(LOG_INFO,
710 "arp: %s moved from %*D to %*D on %s\n",
984263bc
MD
711 inet_ntoa(isaddr),
712 ifp->if_addrlen, (u_char *)LLADDR(sdl), ":",
713 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
3e4a09e7 714 ifp->if_xname);
984263bc
MD
715 else {
716 log(LOG_ERR,
3e4a09e7 717 "arp: %*D attempts to modify permanent entry for %s on %s\n",
984263bc 718 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
3e4a09e7 719 inet_ntoa(isaddr), ifp->if_xname);
984263bc
MD
720 goto reply;
721 }
722 }
723 /*
724 * sanity check for the address length.
725 * XXX this does not work for protocols with variable address
726 * length. -is
727 */
728 if (sdl->sdl_alen &&
729 sdl->sdl_alen != ah->ar_hln) {
730 log(LOG_WARNING,
731 "arp from %*D: new addr len %d, was %d",
732 ifp->if_addrlen, (u_char *) ar_sha(ah), ":",
733 ah->ar_hln, sdl->sdl_alen);
734 }
735 if (ifp->if_addrlen != ah->ar_hln) {
736 log(LOG_WARNING,
737 "arp from %*D: addr len: new %d, i/f %d (ignored)",
738 ifp->if_addrlen, (u_char *) ar_sha(ah), ":",
739 ah->ar_hln, ifp->if_addrlen);
740 goto reply;
741 }
f23061d4 742 memcpy(LLADDR(sdl), ar_sha(ah), sdl->sdl_alen = ah->ar_hln);
984263bc
MD
743 /*
744 * If we receive an arp from a token-ring station over
745 * a token-ring nic then try to save the source
746 * routing info.
747 */
748 if (ifp->if_type == IFT_ISO88025) {
749 th = (struct iso88025_header *)m->m_pkthdr.header;
750 trld = SDL_ISO88025(sdl);
751 rif_len = TR_RCF_RIFLEN(th->rcf);
752 if ((th->iso88025_shost[0] & TR_RII) &&
753 (rif_len > 2)) {
754 trld->trld_rcf = th->rcf;
755 trld->trld_rcf ^= htons(TR_RCF_DIR);
756 memcpy(trld->trld_route, th->rd, rif_len - 2);
757 trld->trld_rcf &= ~htons(TR_RCF_BCST_MASK);
758 /*
759 * Set up source routing information for
760 * reply packet (XXX)
761 */
762 m->m_data -= rif_len;
763 m->m_len += rif_len;
764 m->m_pkthdr.len += rif_len;
765 } else {
766 th->iso88025_shost[0] &= ~TR_RII;
767 trld->trld_rcf = 0;
768 }
769 m->m_data -= 8;
770 m->m_len += 8;
771 m->m_pkthdr.len += 8;
772 th->rcf = trld->trld_rcf;
773 }
774 if (rt->rt_expire)
775 rt->rt_expire = time_second + arpt_keep;
776 rt->rt_flags &= ~RTF_REJECT;
a916e847
JH
777 la->la_asked = 0;
778 la->la_preempt = arp_maxtries;
f23061d4 779 if (la->la_hold != NULL) {
ac0fa530 780 m_adj(la->la_hold, sizeof(struct ether_header));
f23061d4
JH
781 (*ifp->if_output)(ifp, la->la_hold, rt_key(rt), rt);
782 la->la_hold = NULL;
984263bc
MD
783 }
784 }
785reply:
786 if (op != ARPOP_REQUEST) {
787 m_freem(m);
788 return;
789 }
790 if (itaddr.s_addr == myaddr.s_addr) {
791 /* I am the target */
f23061d4
JH
792 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
793 memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln);
984263bc 794 } else {
f23061d4 795 la = arplookup(itaddr.s_addr, FALSE, SIN_PROXY);
984263bc
MD
796 if (la == NULL) {
797 struct sockaddr_in sin;
798
799 if (!arp_proxyall) {
800 m_freem(m);
801 return;
802 }
803
804 bzero(&sin, sizeof sin);
805 sin.sin_family = AF_INET;
806 sin.sin_len = sizeof sin;
807 sin.sin_addr = itaddr;
808
f3ed2586 809 rt = rtpurelookup((struct sockaddr *)&sin);
0c3c561c 810 if (rt == NULL) {
984263bc
MD
811 m_freem(m);
812 return;
813 }
814 /*
815 * Don't send proxies for nodes on the same interface
816 * as this one came out of, or we'll get into a fight
817 * over who claims what Ether address.
818 */
819 if (rt->rt_ifp == ifp) {
f23061d4 820 --rt->rt_refcnt;
984263bc
MD
821 m_freem(m);
822 return;
823 }
f23061d4
JH
824 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
825 memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln);
826 --rt->rt_refcnt;
984263bc 827#ifdef DEBUG_PROXY
0c3c561c 828 printf("arp: proxying for %s\n", inet_ntoa(itaddr));
984263bc
MD
829#endif
830 } else {
831 rt = la->la_rt;
f23061d4 832 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
984263bc 833 sdl = SDL(rt->rt_gateway);
f23061d4 834 memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln);
984263bc
MD
835 }
836 }
837
f23061d4
JH
838 memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln);
839 memcpy(ar_spa(ah), &itaddr, ah->ar_pln);
984263bc
MD
840 ah->ar_op = htons(ARPOP_REPLY);
841 ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */
842 switch (ifp->if_type) {
843 case IFT_ARCNET:
844 arh = (struct arc_header *)sa.sa_data;
845 arh->arc_dhost = *ar_tha(ah);
846 arh->arc_type = ARCTYPE_ARP;
847 break;
848
849 case IFT_ISO88025:
850 /* Re-arrange the source/dest address */
851 memcpy(th->iso88025_dhost, th->iso88025_shost,
0c3c561c 852 sizeof th->iso88025_dhost);
984263bc 853 memcpy(th->iso88025_shost, IF_LLADDR(ifp),
0c3c561c 854 sizeof th->iso88025_shost);
984263bc
MD
855 /* Set the source routing bit if neccesary */
856 if (th->iso88025_dhost[0] & TR_RII) {
857 th->iso88025_dhost[0] &= ~TR_RII;
858 if (TR_RCF_RIFLEN(th->rcf) > 2)
859 th->iso88025_shost[0] |= TR_RII;
860 }
861 /* Copy the addresses, ac and fc into sa_data */
862 memcpy(sa.sa_data, th->iso88025_dhost,
0c3c561c
JH
863 (sizeof th->iso88025_dhost) * 2);
864 sa.sa_data[(sizeof th->iso88025_dhost) * 2] = TR_AC;
865 sa.sa_data[(sizeof th->iso88025_dhost) * 2 + 1] = TR_LLC_FRAME;
984263bc
MD
866 break;
867 case IFT_ETHER:
868 case IFT_FDDI:
869 /*
870 * May not be correct for types not explictly
871 * listed, but it is our best guess.
872 */
873 default:
874 eh = (struct ether_header *)sa.sa_data;
0c3c561c 875 memcpy(eh->ether_dhost, ar_tha(ah), sizeof eh->ether_dhost);
984263bc
MD
876 eh->ether_type = htons(ETHERTYPE_ARP);
877 break;
878 }
879 sa.sa_family = AF_UNSPEC;
0c3c561c 880 sa.sa_len = sizeof sa;
984263bc
MD
881 (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0);
882 return;
883}
884#endif
885
886/*
03f869ef
MD
887 * Free an arp entry. If the arp entry is actively referenced or represents
888 * a static entry we only clear it back to an unresolved state, otherwise
889 * we destroy the entry entirely.
890 *
891 * Note that static entries are created when route add ... -interface is used
892 * to create an interface route to a (direct) destination.
984263bc
MD
893 */
894static void
5fe66e68 895arptfree(struct llinfo_arp *la)
984263bc 896{
2256ba69
RG
897 struct rtentry *rt = la->la_rt;
898 struct sockaddr_dl *sdl;
f23061d4 899
03f869ef 900 if (rt == NULL)
984263bc 901 panic("arptfree");
03f869ef 902 sdl = SDL(rt->rt_gateway);
5fe66e68
JH
903 if (sdl != NULL &&
904 ((rt->rt_refcnt > 0 && sdl->sdl_family == AF_LINK) ||
905 (rt->rt_flags & RTF_STATIC))) {
984263bc
MD
906 sdl->sdl_alen = 0;
907 la->la_preempt = la->la_asked = 0;
908 rt->rt_flags &= ~RTF_REJECT;
909 return;
910 }
f23061d4 911 rtrequest(RTM_DELETE, rt_key(rt), NULL, rt_mask(rt), 0, NULL);
984263bc 912}
0c3c561c 913
984263bc
MD
914/*
915 * Lookup or enter a new address in arptab.
916 */
917static struct llinfo_arp *
f23061d4 918arplookup(in_addr_t addr, boolean_t create, boolean_t proxy)
984263bc 919{
2256ba69 920 struct rtentry *rt;
f3ed2586 921 struct sockaddr_inarp sin = { sizeof sin, AF_INET };
f23061d4 922 const char *why = NULL;
984263bc
MD
923
924 sin.sin_addr.s_addr = addr;
925 sin.sin_other = proxy ? SIN_PROXY : 0;
f3ed2586
JH
926 if (create)
927 rt = rtlookup((struct sockaddr *)&sin);
928 else
929 rt = rtpurelookup((struct sockaddr *)&sin);
f23061d4
JH
930 if (rt == NULL)
931 return (NULL);
984263bc
MD
932 rt->rt_refcnt--;
933
934 if (rt->rt_flags & RTF_GATEWAY)
935 why = "host is not on local network";
f23061d4 936 else if (!(rt->rt_flags & RTF_LLINFO))
984263bc
MD
937 why = "could not allocate llinfo";
938 else if (rt->rt_gateway->sa_family != AF_LINK)
939 why = "gateway route is not ours";
940
8fd3e627
MD
941 if (why) {
942 if (create) {
943 log(LOG_DEBUG, "arplookup %s failed: %s\n",
944 inet_ntoa(sin.sin_addr), why);
945 }
f23061d4
JH
946 if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_WASCLONED)) {
947 /* No references to this route. Purge it. */
948 rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
949 rt_mask(rt), rt->rt_flags, NULL);
8fd3e627 950 }
f23061d4 951 return (NULL);
984263bc 952 }
f23061d4 953 return (rt->rt_llinfo);
984263bc
MD
954}
955
956void
f23061d4 957arp_ifinit(struct ifnet *ifp, struct ifaddr *ifa)
984263bc 958{
f23061d4
JH
959 if (IA_SIN(ifa)->sin_addr.s_addr != INADDR_ANY)
960 arprequest(ifp, &IA_SIN(ifa)->sin_addr, &IA_SIN(ifa)->sin_addr,
961 IF_LLADDR(ifp));
984263bc
MD
962 ifa->ifa_rtrequest = arp_rtrequest;
963 ifa->ifa_flags |= RTF_CLONING;
964}
965
966static void
967arp_init(void)
968{
969 LIST_INIT(&llinfo_arp);
bf82f9b7 970 netisr_register(NETISR_ARP, cpu0_portfn, arpintr);
984263bc
MD
971}
972
973SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0);