kernel - Major bridging functionality completed
[dragonfly.git] / sys / netinet / if_ether.c
CommitLineData
984263bc 1/*
f3ed2586
JH
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/*
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34 * Copyright (c) 1982, 1986, 1988, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * @(#)if_ether.c 8.1 (Berkeley) 6/10/93
66 * $FreeBSD: src/sys/netinet/if_ether.c,v 1.64.2.23 2003/04/11 07:23:15 fjoe Exp $
b95665d8 67 * $DragonFly: src/sys/netinet/if_ether.c,v 1.59 2008/11/22 11:03:35 sephe Exp $
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68 */
69
70/*
71 * Ethernet address resolution protocol.
72 * TODO:
73 * add "inuse/lock" bit (or ref. count) along with valid bit
74 */
75
76#include "opt_inet.h"
0d16ba1d 77#include "opt_carp.h"
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78
79#include <sys/param.h>
80#include <sys/kernel.h>
81#include <sys/queue.h>
82#include <sys/sysctl.h>
83#include <sys/systm.h>
84#include <sys/mbuf.h>
85#include <sys/malloc.h>
86#include <sys/socket.h>
87#include <sys/syslog.h>
65fd4168 88#include <sys/lock.h>
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89
90#include <net/if.h>
91#include <net/if_dl.h>
92#include <net/if_types.h>
93#include <net/route.h>
94#include <net/netisr.h>
95#include <net/if_llc.h>
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96
97#include <netinet/in.h>
98#include <netinet/in_var.h>
99#include <netinet/if_ether.h>
100
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101#include <sys/thread2.h>
102#include <sys/msgport2.h>
103#include <net/netmsg2.h>
684a93c4 104#include <sys/mplock2.h>
4599cf19 105
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106#ifdef CARP
107#include <netinet/ip_carp.h>
108#endif
109
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110#define SIN(s) ((struct sockaddr_in *)s)
111#define SDL(s) ((struct sockaddr_dl *)s)
112
113SYSCTL_DECL(_net_link_ether);
114SYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, "");
115
116/* timer values */
117static int arpt_prune = (5*60*1); /* walk list every 5 minutes */
118static int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */
119static int arpt_down = 20; /* once declared down, don't send for 20 sec */
120
121SYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW,
122 &arpt_prune, 0, "");
f23061d4 123SYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW,
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124 &arpt_keep, 0, "");
125SYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW,
126 &arpt_down, 0, "");
127
f23061d4 128#define rt_expire rt_rmx.rmx_expire
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129
130struct llinfo_arp {
131 LIST_ENTRY(llinfo_arp) la_le;
132 struct rtentry *la_rt;
133 struct mbuf *la_hold; /* last packet until resolved/timeout */
a6f79f3a 134 struct lwkt_port *la_msgport; /* last packet's msgport */
a916e847 135 u_short la_preempt; /* countdown for pre-expiry arps */
984263bc 136 u_short la_asked; /* #times we QUERIED following expiration */
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137};
138
ecdefdda 139static LIST_HEAD(, llinfo_arp) llinfo_arp_list[MAXCPU];
984263bc 140
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141static int arp_maxtries = 5;
142static int useloopback = 1; /* use loopback interface for local traffic */
143static int arp_proxyall = 0;
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144static int arp_refresh = 60; /* refresh arp cache ~60 (not impl yet) */
145static int arp_restricted_match = 0;
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146
147SYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW,
19a2058e 148 &arp_maxtries, 0, "ARP resolution attempts before returning error");
984263bc 149SYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW,
19a2058e 150 &useloopback, 0, "Use the loopback interface for local traffic");
984263bc 151SYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW,
19a2058e 152 &arp_proxyall, 0, "Enable proxy ARP for all suitable requests");
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153SYSCTL_INT(_net_link_ether_inet, OID_AUTO, restricted_match, CTLFLAG_RW,
154 &arp_restricted_match, 0, "Only match against the sender");
155SYSCTL_INT(_net_link_ether_inet, OID_AUTO, refresh, CTLFLAG_RW,
156 &arp_refresh, 0, "Preemptively refresh the ARP");
984263bc 157
799975d0 158static void arp_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
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159static void arprequest(struct ifnet *, const struct in_addr *,
160 const struct in_addr *, const u_char *);
161static void arprequest_async(struct ifnet *, const struct in_addr *,
162 const struct in_addr *, const u_char *);
002c1265 163static void arpintr(netmsg_t msg);
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164static void arptfree(struct llinfo_arp *);
165static void arptimer(void *);
166static struct llinfo_arp *
125186e0 167 arplookup(in_addr_t, boolean_t, boolean_t, boolean_t);
984263bc 168#ifdef INET
799975d0 169static void in_arpinput(struct mbuf *);
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170#endif
171
ecdefdda 172static struct callout arptimer_ch[MAXCPU];
ac311540 173
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174/*
175 * Timeout routine. Age arp_tab entries periodically.
176 */
177/* ARGSUSED */
178static void
f23061d4 179arptimer(void *ignored_arg)
984263bc 180{
2e9572df 181 struct llinfo_arp *la, *nla;
984263bc 182
1cae611f 183 crit_enter();
ecdefdda 184 LIST_FOREACH_MUTABLE(la, &llinfo_arp_list[mycpuid], la_le, nla) {
2e9572df 185 if (la->la_rt->rt_expire && la->la_rt->rt_expire <= time_second)
799975d0 186 arptfree(la);
984263bc 187 }
ecdefdda 188 callout_reset(&arptimer_ch[mycpuid], arpt_prune * hz, arptimer, NULL);
1cae611f 189 crit_exit();
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190}
191
192/*
193 * Parallel to llc_rtrequest.
194 */
195static void
f23061d4 196arp_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
984263bc 197{
2256ba69 198 struct sockaddr *gate = rt->rt_gateway;
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JH
199 struct llinfo_arp *la = rt->rt_llinfo;
200
5fe66e68 201 struct sockaddr_dl null_sdl = { sizeof null_sdl, AF_LINK };
ecdefdda 202 static boolean_t arpinit_done[MAXCPU];
984263bc 203
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204 if (!arpinit_done[mycpuid]) {
205 arpinit_done[mycpuid] = TRUE;
206 callout_init(&arptimer_ch[mycpuid]);
207 callout_reset(&arptimer_ch[mycpuid], hz, arptimer, NULL);
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208 }
209 if (rt->rt_flags & RTF_GATEWAY)
210 return;
984263bc 211
f23061d4 212 switch (req) {
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213 case RTM_ADD:
214 /*
215 * XXX: If this is a manually added route to interface
216 * such as older version of routed or gated might provide,
217 * restore cloning bit.
218 */
f23061d4 219 if (!(rt->rt_flags & RTF_HOST) &&
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220 SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
221 rt->rt_flags |= RTF_CLONING;
222 if (rt->rt_flags & RTF_CLONING) {
223 /*
224 * Case 1: This route should come from a route to iface.
225 */
226 rt_setgate(rt, rt_key(rt),
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227 (struct sockaddr *)&null_sdl,
228 RTL_DONTREPORT);
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229 gate = rt->rt_gateway;
230 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
231 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
232 rt->rt_expire = time_second;
233 break;
234 }
235 /* Announce a new entry if requested. */
9c94ab97 236 if (rt->rt_flags & RTF_ANNOUNCE) {
77e3dc77 237 arprequest_async(rt->rt_ifp,
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238 &SIN(rt_key(rt))->sin_addr,
239 &SIN(rt_key(rt))->sin_addr,
f23061d4 240 LLADDR(SDL(gate)));
9c94ab97 241 }
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242 /*FALLTHROUGH*/
243 case RTM_RESOLVE:
244 if (gate->sa_family != AF_LINK ||
f23061d4 245 gate->sa_len < sizeof(struct sockaddr_dl)) {
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246 log(LOG_DEBUG, "arp_rtrequest: bad gateway value\n");
247 break;
248 }
249 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
250 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
f23061d4 251 if (la != NULL)
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252 break; /* This happens on a route change */
253 /*
254 * Case 2: This route may come from cloning, or a manual route
255 * add with a LL address.
256 */
0c3c561c 257 R_Malloc(la, struct llinfo_arp *, sizeof *la);
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JH
258 rt->rt_llinfo = la;
259 if (la == NULL) {
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260 log(LOG_DEBUG, "arp_rtrequest: malloc failed\n");
261 break;
262 }
f23061d4 263 bzero(la, sizeof *la);
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264 la->la_rt = rt;
265 rt->rt_flags |= RTF_LLINFO;
ecdefdda 266 LIST_INSERT_HEAD(&llinfo_arp_list[mycpuid], la, la_le);
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267
268#ifdef INET
269 /*
270 * This keeps the multicast addresses from showing up
271 * in `arp -a' listings as unresolved. It's not actually
272 * functional. Then the same for broadcast.
273 */
ce6da440 274 if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr))) {
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275 ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr,
276 LLADDR(SDL(gate)));
277 SDL(gate)->sdl_alen = 6;
278 rt->rt_expire = 0;
279 }
280 if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) {
c401f0fd 281 memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr,
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282 rt->rt_ifp->if_addrlen);
283 SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen;
284 rt->rt_expire = 0;
285 }
286#endif
287
288 if (SIN(rt_key(rt))->sin_addr.s_addr ==
289 (IA_SIN(rt->rt_ifa))->sin_addr.s_addr) {
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290 /*
291 * This test used to be
292 * if (loif.if_flags & IFF_UP)
293 * It allowed local traffic to be forced
294 * through the hardware by configuring the
295 * loopback down. However, it causes problems
296 * during network configuration for boards
297 * that can't receive packets they send. It
298 * is now necessary to clear "useloopback" and
299 * remove the route to force traffic out to
300 * the hardware.
301 */
984263bc 302 rt->rt_expire = 0;
2e9572df 303 bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)),
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304 SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen);
305 if (useloopback)
306 rt->rt_ifp = loif;
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307 }
308 break;
309
310 case RTM_DELETE:
f23061d4 311 if (la == NULL)
984263bc 312 break;
984263bc 313 LIST_REMOVE(la, la_le);
f23061d4 314 rt->rt_llinfo = NULL;
984263bc 315 rt->rt_flags &= ~RTF_LLINFO;
f23061d4 316 if (la->la_hold != NULL)
984263bc 317 m_freem(la->la_hold);
f23061d4 318 Free(la);
799975d0 319 break;
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320 }
321}
322
77e3dc77 323static struct mbuf *
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324arpreq_alloc(struct ifnet *ifp, const struct in_addr *sip,
325 const struct in_addr *tip, const u_char *enaddr)
984263bc 326{
2256ba69 327 struct mbuf *m;
2256ba69 328 struct arphdr *ah;
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329 u_short ar_hrd;
330
74f1caca 331 if ((m = m_gethdr(MB_DONTWAIT, MT_DATA)) == NULL)
77e3dc77 332 return NULL;
69e8ff02 333 m->m_pkthdr.rcvif = NULL;
f23061d4 334
984263bc 335 switch (ifp->if_type) {
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336 case IFT_ETHER:
337 /*
338 * This may not be correct for types not explicitly
339 * listed, but this is our best guess
340 */
341 default:
342 ar_hrd = htons(ARPHRD_ETHER);
343
344 m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
345 m->m_pkthdr.len = m->m_len;
346 MH_ALIGN(m, m->m_len);
347
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348 ah = mtod(m, struct arphdr *);
349 break;
350 }
351
352 ah->ar_hrd = ar_hrd;
353 ah->ar_pro = htons(ETHERTYPE_IP);
354 ah->ar_hln = ifp->if_addrlen; /* hardware address length */
355 ah->ar_pln = sizeof(struct in_addr); /* protocol address length */
356 ah->ar_op = htons(ARPOP_REQUEST);
f23061d4 357 memcpy(ar_sha(ah), enaddr, ah->ar_hln);
984263bc 358 memset(ar_tha(ah), 0, ah->ar_hln);
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359 memcpy(ar_spa(ah), sip, ah->ar_pln);
360 memcpy(ar_tpa(ah), tip, ah->ar_pln);
984263bc 361
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362 return m;
363}
364
365static void
366arpreq_send(struct ifnet *ifp, struct mbuf *m)
367{
368 struct sockaddr sa;
369 struct ether_header *eh;
370
371 switch (ifp->if_type) {
372 case IFT_ETHER:
373 /*
374 * This may not be correct for types not explicitly
375 * listed, but this is our best guess
376 */
377 default:
378 eh = (struct ether_header *)sa.sa_data;
379 /* if_output() will not swap */
380 eh->ether_type = htons(ETHERTYPE_ARP);
381 memcpy(eh->ether_dhost, ifp->if_broadcastaddr, ifp->if_addrlen);
382 break;
383 }
384
984263bc 385 sa.sa_family = AF_UNSPEC;
77e3dc77 386 sa.sa_len = sizeof(sa);
799975d0 387 ifp->if_output(ifp, m, &sa, NULL);
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388}
389
77e3dc77 390static void
002c1265 391arpreq_send_handler(netmsg_t msg)
77e3dc77 392{
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MD
393 struct mbuf *m = msg->packet.nm_packet;
394 struct ifnet *ifp = msg->lmsg.u.ms_resultp;
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395
396 arpreq_send(ifp, m);
397 /* nmsg was embedded in the mbuf, do not reply! */
398}
399
400/*
401 * Broadcast an ARP request. Caller specifies:
402 * - arp header source ip address
403 * - arp header target ip address
404 * - arp header source ethernet address
405 *
406 * NOTE: Caller MUST NOT hold ifp's serializer
407 */
408static void
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409arprequest(struct ifnet *ifp, const struct in_addr *sip,
410 const struct in_addr *tip, const u_char *enaddr)
77e3dc77
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411{
412 struct mbuf *m;
413
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414 if (enaddr == NULL) {
415 if (ifp->if_bridge) {
416 enaddr = IF_LLADDR(ether_bridge_interface(ifp));
417 } else {
418 enaddr = IF_LLADDR(ifp);
419 }
420 }
421
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422 m = arpreq_alloc(ifp, sip, tip, enaddr);
423 if (m == NULL)
424 return;
425 arpreq_send(ifp, m);
426}
427
428/*
429 * Same as arprequest(), except:
430 * - Caller is allowed to hold ifp's serializer
c3c96e44 431 * - Network output is done in protocol thead
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432 */
433static void
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434arprequest_async(struct ifnet *ifp, const struct in_addr *sip,
435 const struct in_addr *tip, const u_char *enaddr)
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436{
437 struct mbuf *m;
438 struct netmsg_packet *pmsg;
439
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440 if (enaddr == NULL) {
441 if (ifp->if_bridge) {
442 enaddr = IF_LLADDR(ether_bridge_interface(ifp));
443 } else {
444 enaddr = IF_LLADDR(ifp);
445 }
446 }
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447 m = arpreq_alloc(ifp, sip, tip, enaddr);
448 if (m == NULL)
449 return;
450
451 pmsg = &m->m_hdr.mh_netmsg;
002c1265 452 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport,
48e7b118 453 0, arpreq_send_handler);
77e3dc77 454 pmsg->nm_packet = m;
002c1265 455 pmsg->base.lmsg.u.ms_resultp = ifp;
77e3dc77 456
002c1265 457 lwkt_sendmsg(cpu_portfn(mycpuid), &pmsg->base.lmsg);
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458}
459
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460/*
461 * Resolve an IP address into an ethernet address. If success,
462 * desten is filled in. If there is no entry in arptab,
463 * set one up and broadcast a request for the IP address.
464 * Hold onto this mbuf and resend it once the address
465 * is finally resolved. A return value of 1 indicates
466 * that desten has been filled in and the packet should be sent
467 * normally; a 0 return indicates that the packet has been
468 * taken over here, either now or for later transmission.
469 */
470int
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471arpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m,
472 struct sockaddr *dst, u_char *desten)
984263bc 473{
f23061d4
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474 struct rtentry *rt;
475 struct llinfo_arp *la = NULL;
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476 struct sockaddr_dl *sdl;
477
478 if (m->m_flags & M_BCAST) { /* broadcast */
c401f0fd 479 memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen);
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480 return (1);
481 }
ce6da440 482 if (m->m_flags & M_MCAST) {/* multicast */
984263bc 483 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten);
f23061d4 484 return (1);
984263bc 485 }
f23061d4
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486 if (rt0 != NULL) {
487 if (rt_llroute(dst, rt0, &rt) != 0) {
488 m_freem(m);
489 return 0;
490 }
491 la = rt->rt_llinfo;
492 }
493 if (la == NULL) {
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494 la = arplookup(SIN(dst)->sin_addr.s_addr,
495 TRUE, RTL_REPORTMSG, FALSE);
f23061d4 496 if (la != NULL)
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497 rt = la->la_rt;
498 }
f23061d4 499 if (la == NULL || rt == NULL) {
984263bc 500 log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n",
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501 inet_ntoa(SIN(dst)->sin_addr), la ? "la" : " ",
502 rt ? "rt" : "");
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503 m_freem(m);
504 return (0);
505 }
506 sdl = SDL(rt->rt_gateway);
507 /*
508 * Check the address family and length is valid, the address
509 * is resolved; otherwise, try to resolve.
510 */
511 if ((rt->rt_expire == 0 || rt->rt_expire > time_second) &&
512 sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) {
513 /*
514 * If entry has an expiry time and it is approaching,
515 * see if we need to send an ARP request within this
516 * arpt_down interval.
517 */
518 if ((rt->rt_expire != 0) &&
a916e847 519 (time_second + la->la_preempt > rt->rt_expire)) {
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520 arprequest(ifp,
521 &SIN(rt->rt_ifa->ifa_addr)->sin_addr,
522 &SIN(dst)->sin_addr,
70d9a675 523 NULL);
a916e847 524 la->la_preempt--;
f23061d4 525 }
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526
527 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
528 return 1;
529 }
530 /*
07813904 531 * If ARP is disabled or static on this interface, stop.
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532 * XXX
533 * Probably should not allocate empty llinfo struct if we are
534 * not going to be sending out an arp request.
535 */
07813904 536 if (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) {
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537 m_freem(m);
538 return (0);
539 }
540 /*
541 * There is an arptab entry, but no ethernet address
542 * response yet. Replace the held mbuf with this
543 * latest one.
544 */
f23061d4 545 if (la->la_hold != NULL)
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546 m_freem(la->la_hold);
547 la->la_hold = m;
c3c96e44 548 la->la_msgport = cur_netport();
03f869ef 549 if (rt->rt_expire || ((rt->rt_flags & RTF_STATIC) && !sdl->sdl_alen)) {
984263bc
MD
550 rt->rt_flags &= ~RTF_REJECT;
551 if (la->la_asked == 0 || rt->rt_expire != time_second) {
552 rt->rt_expire = time_second;
553 if (la->la_asked++ < arp_maxtries) {
554 arprequest(ifp,
555 &SIN(rt->rt_ifa->ifa_addr)->sin_addr,
556 &SIN(dst)->sin_addr,
70d9a675 557 NULL);
984263bc
MD
558 } else {
559 rt->rt_flags |= RTF_REJECT;
560 rt->rt_expire += arpt_down;
a916e847
JH
561 la->la_asked = 0;
562 la->la_preempt = arp_maxtries;
984263bc 563 }
984263bc
MD
564 }
565 }
566 return (0);
567}
568
569/*
570 * Common length and type checks are done here,
571 * then the protocol-specific routine is called.
572 */
4599cf19 573static void
002c1265 574arpintr(netmsg_t msg)
984263bc 575{
002c1265 576 struct mbuf *m = msg->packet.nm_packet;
2256ba69 577 struct arphdr *ar;
8bde602d 578 u_short ar_hrd;
984263bc 579
8bde602d 580 if (m->m_len < sizeof(struct arphdr) &&
db597c8a 581 (m = m_pullup(m, sizeof(struct arphdr))) == NULL) {
8bde602d 582 log(LOG_ERR, "arp: runt packet -- m_pullup failed\n");
db597c8a 583 return;
8bde602d
JH
584 }
585 ar = mtod(m, struct arphdr *);
586
587 ar_hrd = ntohs(ar->ar_hrd);
db597c8a
SZ
588 if (ar_hrd != ARPHRD_ETHER && ar_hrd != ARPHRD_IEEE802) {
589 log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n",
8bde602d 590 (unsigned char *)&ar->ar_hrd, "");
db597c8a
SZ
591 m_freem(m);
592 return;
8bde602d 593 }
984263bc 594
db597c8a
SZ
595 if (m->m_pkthdr.len < arphdr_len(ar)) {
596 if ((m = m_pullup(m, arphdr_len(ar))) == NULL) {
597 log(LOG_ERR, "arp: runt packet\n");
598 return;
599 }
600 ar = mtod(m, struct arphdr *);
8bde602d
JH
601 }
602
603 switch (ntohs(ar->ar_pro)) {
984263bc 604#ifdef INET
db597c8a
SZ
605 case ETHERTYPE_IP:
606 in_arpinput(m);
607 return;
984263bc 608#endif
984263bc 609 }
8bde602d 610 m_freem(m);
6aad077d 611 /* msg was embedded in the mbuf, do not reply! */
984263bc
MD
612}
613
614#ifdef INET
615/*
616 * ARP for Internet protocols on 10 Mb/s Ethernet.
617 * Algorithm is that given in RFC 826.
618 * In addition, a sanity check is performed on the sender
619 * protocol address, to catch impersonators.
620 * We no longer handle negotiations for use of trailer protocol:
621 * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent
622 * along with IP replies if we wanted trailers sent to us,
623 * and also sent them in response to IP replies.
624 * This allowed either end to announce the desire to receive
625 * trailer packets.
626 * We no longer reply to requests for ETHERTYPE_TRAIL protocol either,
627 * but formerly didn't normally send requests.
628 */
87ccd6a5
SZ
629
630static int log_arp_wrong_iface = 1;
631static int log_arp_movements = 1;
632static int log_arp_permanent_modify = 1;
633
984263bc 634SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW,
799975d0 635 &log_arp_wrong_iface, 0,
87ccd6a5
SZ
636 "Log arp packets arriving on the wrong interface");
637SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW,
638 &log_arp_movements, 0,
639 "Log arp replies from MACs different than the one in the cache");
640SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_permanent_modify, CTLFLAG_RW,
641 &log_arp_permanent_modify, 0,
642 "Log arp replies from MACs different than the one "
643 "in the permanent arp entry");
644
984263bc 645
ecdefdda 646static void
002c1265 647arp_hold_output(netmsg_t msg)
a6f79f3a 648{
002c1265 649 struct mbuf *m = msg->packet.nm_packet;
a6f79f3a
SZ
650 struct rtentry *rt;
651 struct ifnet *ifp;
652
002c1265 653 rt = msg->lmsg.u.ms_resultp;
a6f79f3a
SZ
654 ifp = m->m_pkthdr.rcvif;
655 m->m_pkthdr.rcvif = NULL;
656
657 ifp->if_output(ifp, m, rt_key(rt), rt);
658
659 /* Drop the reference count bumped by the sender */
660 RTFREE(rt);
661
662 /* nmsg was embedded in the mbuf, do not reply! */
663}
664
665static void
ecdefdda 666arp_update_oncpu(struct mbuf *m, in_addr_t saddr, boolean_t create,
125186e0 667 boolean_t generate_report, boolean_t dologging)
ecdefdda
MD
668{
669 struct arphdr *ah = mtod(m, struct arphdr *);
670 struct ifnet *ifp = m->m_pkthdr.rcvif;
671 struct llinfo_arp *la;
672 struct sockaddr_dl *sdl;
673 struct rtentry *rt;
ecdefdda 674
125186e0 675 la = arplookup(saddr, create, generate_report, FALSE);
ecdefdda
MD
676 if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) {
677 struct in_addr isaddr = { saddr };
678
70d9a675
MD
679 /*
680 * Normally arps coming in on the wrong interface are ignored,
681 * but if we are bridging and the two interfaces belong to
682 * the same bridge, or one is a member of the bridge which
683 * is the other, then it isn't an error.
684 */
a8d45119 685 if (rt->rt_ifp != ifp) {
70d9a675
MD
686 /*
687 * (1) ifp and rt_ifp both members of same bridge
688 * (2) rt_ifp member of bridge ifp
689 * (3) ifp member of bridge rt_ifp
690 *
691 * Always replace rt_ifp with the bridge ifc.
692 */
693 struct ifnet *nifp;
694
4ee4f753
MD
695 if (ifp->if_bridge &&
696 rt->rt_ifp->if_bridge == ifp->if_bridge) {
70d9a675
MD
697 nifp = ether_bridge_interface(ifp);
698 } else if (rt->rt_ifp->if_bridge &&
699 ether_bridge_interface(rt->rt_ifp) == ifp) {
700 nifp = ifp;
701 } else if (ifp->if_bridge &&
702 ether_bridge_interface(ifp) == rt->rt_ifp) {
703 nifp = rt->rt_ifp;
704 } else {
705 nifp = NULL;
4ee4f753 706 }
4ee4f753 707
70d9a675
MD
708 if ((log_arp_wrong_iface == 1 && nifp == NULL) ||
709 log_arp_wrong_iface == 2) {
ecdefdda
MD
710 log(LOG_ERR,
711 "arp: %s is on %s "
712 "but got reply from %*D on %s\n",
713 inet_ntoa(isaddr),
714 rt->rt_ifp->if_xname,
715 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
716 ifp->if_xname);
717 }
70d9a675
MD
718 if (nifp == NULL)
719 return;
720
721 /*
722 * nifp is our man! Replace rt_ifp and adjust
723 * the sdl.
724 */
725 ifp = rt->rt_ifp = nifp;
726 sdl->sdl_type = ifp->if_type;
727 sdl->sdl_index = ifp->if_index;
ecdefdda
MD
728 }
729 if (sdl->sdl_alen &&
730 bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) {
731 if (rt->rt_expire != 0) {
87ccd6a5 732 if (dologging && log_arp_movements) {
ecdefdda
MD
733 log(LOG_INFO,
734 "arp: %s moved from %*D to %*D on %s\n",
735 inet_ntoa(isaddr),
736 ifp->if_addrlen, (u_char *)LLADDR(sdl),
737 ":", ifp->if_addrlen,
738 (u_char *)ar_sha(ah), ":",
739 ifp->if_xname);
740 }
741 } else {
87ccd6a5 742 if (dologging && log_arp_permanent_modify) {
ecdefdda 743 log(LOG_ERR,
799975d0
SZ
744 "arp: %*D attempts to modify "
745 "permanent entry for %s on %s\n",
746 ifp->if_addrlen, (u_char *)ar_sha(ah),
747 ":", inet_ntoa(isaddr), ifp->if_xname);
ecdefdda
MD
748 }
749 return;
750 }
751 }
752 /*
753 * sanity check for the address length.
754 * XXX this does not work for protocols with variable address
755 * length. -is
756 */
e090f4c1 757 if (dologging && sdl->sdl_alen && sdl->sdl_alen != ah->ar_hln) {
ecdefdda
MD
758 log(LOG_WARNING,
759 "arp from %*D: new addr len %d, was %d",
760 ifp->if_addrlen, (u_char *) ar_sha(ah), ":",
761 ah->ar_hln, sdl->sdl_alen);
762 }
763 if (ifp->if_addrlen != ah->ar_hln) {
e090f4c1 764 if (dologging) {
ecdefdda 765 log(LOG_WARNING,
799975d0
SZ
766 "arp from %*D: addr len: new %d, i/f %d "
767 "(ignored)",
ecdefdda
MD
768 ifp->if_addrlen, (u_char *) ar_sha(ah), ":",
769 ah->ar_hln, ifp->if_addrlen);
770 }
771 return;
772 }
773 memcpy(LLADDR(sdl), ar_sha(ah), sdl->sdl_alen = ah->ar_hln);
70d9a675 774 if (rt->rt_expire != 0) {
ecdefdda 775 rt->rt_expire = time_second + arpt_keep;
70d9a675 776 }
ecdefdda
MD
777 rt->rt_flags &= ~RTF_REJECT;
778 la->la_asked = 0;
779 la->la_preempt = arp_maxtries;
780
781 /*
782 * This particular cpu might have been holding an mbuf
783 * pending ARP resolution. If so, transmit the mbuf now.
784 */
785 if (la->la_hold != NULL) {
a6f79f3a
SZ
786 struct mbuf *m = la->la_hold;
787 struct lwkt_port *port = la->la_msgport;
788 struct netmsg_packet *pmsg;
789
ecdefdda 790 la->la_hold = NULL;
a6f79f3a
SZ
791 la->la_msgport = NULL;
792
793 m_adj(m, sizeof(struct ether_header));
794
795 /*
796 * Make sure that this rtentry will not be freed
797 * before the packet is processed on the target
798 * msgport. The reference count will be dropped
799 * in the handler associated with this packet.
800 */
801 rt->rt_refcnt++;
802
803 pmsg = &m->m_hdr.mh_netmsg;
002c1265 804 netmsg_init(&pmsg->base, NULL,
48e7b118 805 &netisr_apanic_rport,
c3c96e44 806 MSGF_PRIORITY, arp_hold_output);
a6f79f3a
SZ
807 pmsg->nm_packet = m;
808
809 /* Record necessary information */
810 m->m_pkthdr.rcvif = ifp;
002c1265 811 pmsg->base.lmsg.u.ms_resultp = rt;
a6f79f3a 812
002c1265 813 lwkt_sendmsg(port, &pmsg->base.lmsg);
ecdefdda
MD
814 }
815 }
816}
817
818#ifdef SMP
819
820struct netmsg_arp_update {
002c1265 821 struct netmsg_base base;
ecdefdda
MD
822 struct mbuf *m;
823 in_addr_t saddr;
824 boolean_t create;
825};
826
002c1265 827static void arp_update_msghandler(netmsg_t msg);
ecdefdda
MD
828
829#endif
830
831/*
832 * Called from arpintr() - this routine is run from a single cpu.
833 */
984263bc 834static void
f23061d4 835in_arpinput(struct mbuf *m)
984263bc 836{
2256ba69
RG
837 struct arphdr *ah;
838 struct ifnet *ifp = m->m_pkthdr.rcvif;
984263bc 839 struct ether_header *eh;
2256ba69 840 struct rtentry *rt;
b2632176 841 struct ifaddr_container *ifac;
f8983475 842 struct in_ifaddr_container *iac;
5bd4422e 843 struct in_ifaddr *ia = NULL;
984263bc
MD
844 struct sockaddr sa;
845 struct in_addr isaddr, itaddr, myaddr;
ecdefdda
MD
846#ifdef SMP
847 struct netmsg_arp_update msg;
848#endif
5bd4422e 849 uint8_t *enaddr = NULL;
ecdefdda 850 int op;
984263bc
MD
851 int req_len;
852
853 req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
854 if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) {
855 log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n");
856 return;
857 }
858
859 ah = mtod(m, struct arphdr *);
860 op = ntohs(ah->ar_op);
f23061d4
JH
861 memcpy(&isaddr, ar_spa(ah), sizeof isaddr);
862 memcpy(&itaddr, ar_tpa(ah), sizeof itaddr);
5bd4422e
SZ
863
864 myaddr.s_addr = INADDR_ANY;
865#ifdef CARP
866 if (ifp->if_carp != NULL) {
867 get_mplock();
868 if (ifp->if_carp != NULL &&
869 carp_iamatch(ifp->if_carp, &itaddr, &isaddr, &enaddr)) {
870 rel_mplock();
871 myaddr = itaddr;
872 goto match;
873 }
874 rel_mplock();
875 }
876#endif
877
984263bc 878 /*
ed5bc924
SS
879 * Check both target and sender IP addresses:
880 *
881 * If we receive the packet on the interface owning the address,
882 * then accept the address.
883 *
884 * For a bridge, we accept the address if the receive interface and
70d9a675
MD
885 * the interface owning the address are on the same bridge, and
886 * use the bridge MAC as the is-at response. The bridge will be
887 * responsible for handling the packet.
888 *
889 * (1) Check target IP against our local IPs
984263bc 890 */
f8983475
SZ
891 LIST_FOREACH(iac, INADDR_HASH(itaddr.s_addr), ia_hash) {
892 ia = iac->ia;
893
ed5bc924
SS
894 /* Skip all ia's which don't match */
895 if (itaddr.s_addr != ia->ia_addr.sin_addr.s_addr)
896 continue;
5bd4422e
SZ
897#ifdef CARP
898 if (ia->ia_ifp->if_type == IFT_CARP)
899 continue;
900#endif
70d9a675
MD
901 if (ifp->if_bridge && ia->ia_ifp &&
902 ifp->if_bridge == ia->ia_ifp->if_bridge) {
903 ifp = ether_bridge_interface(ifp);
904 goto match;
905 }
906 if (ia->ia_ifp && ia->ia_ifp->if_bridge &&
907 ether_bridge_interface(ia->ia_ifp) == ifp) {
908 goto match;
909 }
910 if (ifp->if_bridge && ether_bridge_interface(ifp) ==
911 ia->ia_ifp) {
912 goto match;
913 }
ed5bc924
SS
914 if (ia->ia_ifp == ifp)
915 goto match;
916
ac93838f 917 }
70d9a675
MD
918
919 /*
920 * (2) Check sender IP against our local IPs
921 */
f8983475
SZ
922 LIST_FOREACH(iac, INADDR_HASH(isaddr.s_addr), ia_hash) {
923 ia = iac->ia;
924
ed5bc924
SS
925 /* Skip all ia's which don't match */
926 if (isaddr.s_addr != ia->ia_addr.sin_addr.s_addr)
927 continue;
5bd4422e
SZ
928#ifdef CARP
929 if (ia->ia_ifp->if_type == IFT_CARP)
930 continue;
931#endif
70d9a675
MD
932 if (ifp->if_bridge && ia->ia_ifp &&
933 ifp->if_bridge == ia->ia_ifp->if_bridge) {
934 ifp = ether_bridge_interface(ifp);
ed5bc924 935 goto match;
70d9a675
MD
936 }
937 if (ia->ia_ifp && ia->ia_ifp->if_bridge &&
938 ether_bridge_interface(ia->ia_ifp) == ifp) {
939 goto match;
940 }
941 if (ifp->if_bridge && ether_bridge_interface(ifp) ==
942 ia->ia_ifp) {
943 goto match;
944 }
ed5bc924 945
70d9a675 946 if (ia->ia_ifp == ifp)
ac93838f 947 goto match;
ac93838f 948 }
70d9a675 949
984263bc
MD
950 /*
951 * No match, use the first inet address on the receive interface
952 * as a dummy address for the rest of the function.
953 */
b2632176
SZ
954 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
955 struct ifaddr *ifa = ifac->ifa;
956
984263bc
MD
957 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
958 ia = ifatoia(ifa);
959 goto match;
960 }
984263bc 961 }
70d9a675 962
ed5bc924
SS
963 /*
964 * If we got here, we didn't find any suitable interface,
965 * so drop the packet.
966 */
967 m_freem(m);
968 return;
969
984263bc 970match:
0d16ba1d 971 if (!enaddr)
5bd4422e
SZ
972 enaddr = (uint8_t *)IF_LLADDR(ifp);
973 if (myaddr.s_addr == INADDR_ANY)
974 myaddr = ia->ia_addr.sin_addr;
0d16ba1d 975 if (!bcmp(ar_sha(ah), enaddr, ifp->if_addrlen)) {
984263bc
MD
976 m_freem(m); /* it's from me, ignore it. */
977 return;
978 }
c401f0fd 979 if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) {
984263bc
MD
980 log(LOG_ERR,
981 "arp: link address is broadcast for IP address %s!\n",
982 inet_ntoa(isaddr));
983 m_freem(m);
984 return;
985 }
c3749f74 986 if (isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) {
984263bc
MD
987 log(LOG_ERR,
988 "arp: %*D is using my IP address %s!\n",
989 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
990 inet_ntoa(isaddr));
991 itaddr = myaddr;
992 goto reply;
993 }
07813904
SZ
994 if (ifp->if_flags & IFF_STATICARP)
995 goto reply;
70d9a675
MD
996
997 /*
998 * When arp_restricted_match is true and the ARP response is not
999 * specifically targetted to me, ignore it. Otherwise the entry
1000 * timeout may be updated for an old MAC.
1001 */
1002 if (arp_restricted_match && itaddr.s_addr != myaddr.s_addr) {
1003 m_freem(m);
1004 return;
1005 }
1006
ecdefdda 1007#ifdef SMP
002c1265 1008 netmsg_init(&msg.base, NULL, &curthread->td_msgport,
48e7b118 1009 0, arp_update_msghandler);
ecdefdda
MD
1010 msg.m = m;
1011 msg.saddr = isaddr.s_addr;
1012 msg.create = (itaddr.s_addr == myaddr.s_addr);
002c1265 1013 lwkt_domsg(rtable_portfn(0), &msg.base.lmsg, 0);
e090f4c1 1014#else
ecdefdda 1015 arp_update_oncpu(m, isaddr.s_addr, (itaddr.s_addr == myaddr.s_addr),
125186e0 1016 RTL_REPORTMSG, TRUE);
e090f4c1 1017#endif
984263bc
MD
1018reply:
1019 if (op != ARPOP_REQUEST) {
1020 m_freem(m);
1021 return;
1022 }
1023 if (itaddr.s_addr == myaddr.s_addr) {
1024 /* I am the target */
f23061d4 1025 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
0d16ba1d 1026 memcpy(ar_sha(ah), enaddr, ah->ar_hln);
984263bc 1027 } else {
ecdefdda
MD
1028 struct llinfo_arp *la;
1029
125186e0 1030 la = arplookup(itaddr.s_addr, FALSE, RTL_DONTREPORT, SIN_PROXY);
984263bc
MD
1031 if (la == NULL) {
1032 struct sockaddr_in sin;
1033
1034 if (!arp_proxyall) {
1035 m_freem(m);
1036 return;
1037 }
1038
1039 bzero(&sin, sizeof sin);
1040 sin.sin_family = AF_INET;
1041 sin.sin_len = sizeof sin;
1042 sin.sin_addr = itaddr;
1043
f3ed2586 1044 rt = rtpurelookup((struct sockaddr *)&sin);
0c3c561c 1045 if (rt == NULL) {
984263bc
MD
1046 m_freem(m);
1047 return;
1048 }
be23faf1 1049 --rt->rt_refcnt;
984263bc
MD
1050 /*
1051 * Don't send proxies for nodes on the same interface
1052 * as this one came out of, or we'll get into a fight
1053 * over who claims what Ether address.
1054 */
1055 if (rt->rt_ifp == ifp) {
984263bc
MD
1056 m_freem(m);
1057 return;
1058 }
f23061d4 1059 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
0d16ba1d 1060 memcpy(ar_sha(ah), enaddr, ah->ar_hln);
984263bc 1061#ifdef DEBUG_PROXY
a6ec04bc 1062 kprintf("arp: proxying for %s\n", inet_ntoa(itaddr));
984263bc
MD
1063#endif
1064 } else {
ecdefdda
MD
1065 struct sockaddr_dl *sdl;
1066
984263bc 1067 rt = la->la_rt;
f23061d4 1068 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
984263bc 1069 sdl = SDL(rt->rt_gateway);
f23061d4 1070 memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln);
984263bc
MD
1071 }
1072 }
1073
f23061d4
JH
1074 memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln);
1075 memcpy(ar_spa(ah), &itaddr, ah->ar_pln);
984263bc
MD
1076 ah->ar_op = htons(ARPOP_REPLY);
1077 ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */
1078 switch (ifp->if_type) {
984263bc 1079 case IFT_ETHER:
70d9a675
MD
1080 /*
1081 * May not be correct for types not explictly
1082 * listed, but it is our best guess.
1083 */
984263bc
MD
1084 default:
1085 eh = (struct ether_header *)sa.sa_data;
0c3c561c 1086 memcpy(eh->ether_dhost, ar_tha(ah), sizeof eh->ether_dhost);
984263bc
MD
1087 eh->ether_type = htons(ETHERTYPE_ARP);
1088 break;
1089 }
1090 sa.sa_family = AF_UNSPEC;
0c3c561c 1091 sa.sa_len = sizeof sa;
799975d0 1092 ifp->if_output(ifp, m, &sa, NULL);
984263bc 1093}
ecdefdda
MD
1094
1095#ifdef SMP
1096
799975d0 1097static void
002c1265 1098arp_update_msghandler(netmsg_t msg)
ecdefdda 1099{
002c1265 1100 struct netmsg_arp_update *rmsg = (struct netmsg_arp_update *)msg;
ecdefdda
MD
1101 int nextcpu;
1102
125186e0
SZ
1103 /*
1104 * This message handler will be called on all of the CPUs,
1105 * however, we only need to generate rtmsg on CPU0.
1106 */
002c1265 1107 arp_update_oncpu(rmsg->m, rmsg->saddr, rmsg->create,
125186e0
SZ
1108 mycpuid == 0 ? RTL_REPORTMSG : RTL_DONTREPORT,
1109 mycpuid == 0);
ecdefdda
MD
1110
1111 nextcpu = mycpuid + 1;
799975d0 1112 if (nextcpu < ncpus)
002c1265 1113 lwkt_forwardmsg(rtable_portfn(nextcpu), &rmsg->base.lmsg);
799975d0 1114 else
002c1265 1115 lwkt_replymsg(&rmsg->base.lmsg, 0);
ecdefdda
MD
1116}
1117
799975d0 1118#endif /* SMP */
ecdefdda 1119
799975d0 1120#endif /* INET */
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1121
1122/*
03f869ef
MD
1123 * Free an arp entry. If the arp entry is actively referenced or represents
1124 * a static entry we only clear it back to an unresolved state, otherwise
1125 * we destroy the entry entirely.
1126 *
1127 * Note that static entries are created when route add ... -interface is used
1128 * to create an interface route to a (direct) destination.
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MD
1129 */
1130static void
5fe66e68 1131arptfree(struct llinfo_arp *la)
984263bc 1132{
2256ba69
RG
1133 struct rtentry *rt = la->la_rt;
1134 struct sockaddr_dl *sdl;
f23061d4 1135
03f869ef 1136 if (rt == NULL)
984263bc 1137 panic("arptfree");
03f869ef 1138 sdl = SDL(rt->rt_gateway);
5fe66e68
JH
1139 if (sdl != NULL &&
1140 ((rt->rt_refcnt > 0 && sdl->sdl_family == AF_LINK) ||
1141 (rt->rt_flags & RTF_STATIC))) {
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MD
1142 sdl->sdl_alen = 0;
1143 la->la_preempt = la->la_asked = 0;
1144 rt->rt_flags &= ~RTF_REJECT;
1145 return;
1146 }
f23061d4 1147 rtrequest(RTM_DELETE, rt_key(rt), NULL, rt_mask(rt), 0, NULL);
984263bc 1148}
0c3c561c 1149
984263bc
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1150/*
1151 * Lookup or enter a new address in arptab.
1152 */
1153static struct llinfo_arp *
125186e0
SZ
1154arplookup(in_addr_t addr, boolean_t create, boolean_t generate_report,
1155 boolean_t proxy)
984263bc 1156{
2256ba69 1157 struct rtentry *rt;
f3ed2586 1158 struct sockaddr_inarp sin = { sizeof sin, AF_INET };
f23061d4 1159 const char *why = NULL;
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1160
1161 sin.sin_addr.s_addr = addr;
1162 sin.sin_other = proxy ? SIN_PROXY : 0;
125186e0
SZ
1163 if (create) {
1164 rt = _rtlookup((struct sockaddr *)&sin,
1165 generate_report, RTL_DOCLONE);
1166 } else {
f3ed2586 1167 rt = rtpurelookup((struct sockaddr *)&sin);
125186e0 1168 }
f23061d4
JH
1169 if (rt == NULL)
1170 return (NULL);
984263bc
MD
1171 rt->rt_refcnt--;
1172
1173 if (rt->rt_flags & RTF_GATEWAY)
1174 why = "host is not on local network";
f23061d4 1175 else if (!(rt->rt_flags & RTF_LLINFO))
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MD
1176 why = "could not allocate llinfo";
1177 else if (rt->rt_gateway->sa_family != AF_LINK)
1178 why = "gateway route is not ours";
1179
8fd3e627
MD
1180 if (why) {
1181 if (create) {
1182 log(LOG_DEBUG, "arplookup %s failed: %s\n",
1183 inet_ntoa(sin.sin_addr), why);
1184 }
f23061d4
JH
1185 if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_WASCLONED)) {
1186 /* No references to this route. Purge it. */
1187 rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
be23faf1 1188 rt_mask(rt), rt->rt_flags, NULL);
8fd3e627 1189 }
f23061d4 1190 return (NULL);
984263bc 1191 }
f23061d4 1192 return (rt->rt_llinfo);
984263bc
MD
1193}
1194
1195void
f23061d4 1196arp_ifinit(struct ifnet *ifp, struct ifaddr *ifa)
984263bc 1197{
57dff79c 1198 if (IA_SIN(ifa)->sin_addr.s_addr != INADDR_ANY) {
77e3dc77 1199 arprequest_async(ifp, &IA_SIN(ifa)->sin_addr,
70d9a675 1200 &IA_SIN(ifa)->sin_addr, NULL);
57dff79c 1201 }
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1202 ifa->ifa_rtrequest = arp_rtrequest;
1203 ifa->ifa_flags |= RTF_CLONING;
1204}
1205
0d16ba1d 1206void
5bd4422e 1207arp_iainit(struct ifnet *ifp, const struct in_addr *addr, const u_char *enaddr)
0d16ba1d 1208{
5bd4422e
SZ
1209 if (addr->s_addr != INADDR_ANY)
1210 arprequest_async(ifp, addr, addr, enaddr);
0d16ba1d
MD
1211}
1212
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MD
1213static void
1214arp_init(void)
1215{
ecdefdda
MD
1216 int cpu;
1217
1218 for (cpu = 0; cpu < ncpus2; cpu++)
1219 LIST_INIT(&llinfo_arp_list[cpu]);
ed2327fe 1220
c3c96e44 1221 netisr_register(NETISR_ARP, arpintr, NULL);
984263bc
MD
1222}
1223
1224SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0);