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[dragonfly.git] / sys / netinet / if_ether.c
CommitLineData
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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
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33/*
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>
104
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105#ifdef CARP
106#include <netinet/ip_carp.h>
107#endif
108
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109#define SIN(s) ((struct sockaddr_in *)s)
110#define SDL(s) ((struct sockaddr_dl *)s)
111
112SYSCTL_DECL(_net_link_ether);
113SYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, "");
114
115/* timer values */
116static int arpt_prune = (5*60*1); /* walk list every 5 minutes */
117static int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */
118static int arpt_down = 20; /* once declared down, don't send for 20 sec */
119
120SYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW,
121 &arpt_prune, 0, "");
f23061d4 122SYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW,
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123 &arpt_keep, 0, "");
124SYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW,
125 &arpt_down, 0, "");
126
f23061d4 127#define rt_expire rt_rmx.rmx_expire
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128
129struct llinfo_arp {
130 LIST_ENTRY(llinfo_arp) la_le;
131 struct rtentry *la_rt;
132 struct mbuf *la_hold; /* last packet until resolved/timeout */
a6f79f3a 133 struct lwkt_port *la_msgport; /* last packet's msgport */
a916e847 134 u_short la_preempt; /* countdown for pre-expiry arps */
984263bc 135 u_short la_asked; /* #times we QUERIED following expiration */
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136};
137
ecdefdda 138static LIST_HEAD(, llinfo_arp) llinfo_arp_list[MAXCPU];
984263bc 139
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140static int arp_maxtries = 5;
141static int useloopback = 1; /* use loopback interface for local traffic */
142static int arp_proxyall = 0;
143
144SYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW,
145 &arp_maxtries, 0, "");
146SYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW,
147 &useloopback, 0, "");
148SYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW,
149 &arp_proxyall, 0, "");
150
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151static int arp_mpsafe = 0;
152TUNABLE_INT("net.link.ether.inet.arp_mpsafe", &arp_mpsafe);
153
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154static void arp_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
155static void arprequest(struct ifnet *, struct in_addr *, struct in_addr *,
69e8ff02 156 const u_char *);
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157static void arprequest_async(struct ifnet *, struct in_addr *,
158 struct in_addr *, const u_char *);
4599cf19 159static void arpintr(struct netmsg *);
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160static void arptfree(struct llinfo_arp *);
161static void arptimer(void *);
162static struct llinfo_arp *
163 arplookup(in_addr_t, boolean_t, boolean_t);
984263bc 164#ifdef INET
799975d0 165static void in_arpinput(struct mbuf *);
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166#endif
167
ecdefdda 168static struct callout arptimer_ch[MAXCPU];
ac311540 169
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170/*
171 * Timeout routine. Age arp_tab entries periodically.
172 */
173/* ARGSUSED */
174static void
f23061d4 175arptimer(void *ignored_arg)
984263bc 176{
2e9572df 177 struct llinfo_arp *la, *nla;
984263bc 178
1cae611f 179 crit_enter();
ecdefdda 180 LIST_FOREACH_MUTABLE(la, &llinfo_arp_list[mycpuid], la_le, nla) {
2e9572df 181 if (la->la_rt->rt_expire && la->la_rt->rt_expire <= time_second)
799975d0 182 arptfree(la);
984263bc 183 }
ecdefdda 184 callout_reset(&arptimer_ch[mycpuid], arpt_prune * hz, arptimer, NULL);
1cae611f 185 crit_exit();
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186}
187
188/*
189 * Parallel to llc_rtrequest.
190 */
191static void
f23061d4 192arp_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
984263bc 193{
2256ba69 194 struct sockaddr *gate = rt->rt_gateway;
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195 struct llinfo_arp *la = rt->rt_llinfo;
196
5fe66e68 197 struct sockaddr_dl null_sdl = { sizeof null_sdl, AF_LINK };
ecdefdda 198 static boolean_t arpinit_done[MAXCPU];
984263bc 199
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200 if (!arpinit_done[mycpuid]) {
201 arpinit_done[mycpuid] = TRUE;
202 callout_init(&arptimer_ch[mycpuid]);
203 callout_reset(&arptimer_ch[mycpuid], hz, arptimer, NULL);
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204 }
205 if (rt->rt_flags & RTF_GATEWAY)
206 return;
984263bc 207
f23061d4 208 switch (req) {
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209 case RTM_ADD:
210 /*
211 * XXX: If this is a manually added route to interface
212 * such as older version of routed or gated might provide,
213 * restore cloning bit.
214 */
f23061d4 215 if (!(rt->rt_flags & RTF_HOST) &&
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216 SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
217 rt->rt_flags |= RTF_CLONING;
218 if (rt->rt_flags & RTF_CLONING) {
219 /*
220 * Case 1: This route should come from a route to iface.
221 */
222 rt_setgate(rt, rt_key(rt),
0c3c561c 223 (struct sockaddr *)&null_sdl);
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224 gate = rt->rt_gateway;
225 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
226 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
227 rt->rt_expire = time_second;
228 break;
229 }
230 /* Announce a new entry if requested. */
9c94ab97 231 if (rt->rt_flags & RTF_ANNOUNCE) {
77e3dc77 232 arprequest_async(rt->rt_ifp,
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233 &SIN(rt_key(rt))->sin_addr,
234 &SIN(rt_key(rt))->sin_addr,
f23061d4 235 LLADDR(SDL(gate)));
9c94ab97 236 }
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237 /*FALLTHROUGH*/
238 case RTM_RESOLVE:
239 if (gate->sa_family != AF_LINK ||
f23061d4 240 gate->sa_len < sizeof(struct sockaddr_dl)) {
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241 log(LOG_DEBUG, "arp_rtrequest: bad gateway value\n");
242 break;
243 }
244 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
245 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
f23061d4 246 if (la != NULL)
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247 break; /* This happens on a route change */
248 /*
249 * Case 2: This route may come from cloning, or a manual route
250 * add with a LL address.
251 */
0c3c561c 252 R_Malloc(la, struct llinfo_arp *, sizeof *la);
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JH
253 rt->rt_llinfo = la;
254 if (la == NULL) {
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255 log(LOG_DEBUG, "arp_rtrequest: malloc failed\n");
256 break;
257 }
f23061d4 258 bzero(la, sizeof *la);
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259 la->la_rt = rt;
260 rt->rt_flags |= RTF_LLINFO;
ecdefdda 261 LIST_INSERT_HEAD(&llinfo_arp_list[mycpuid], la, la_le);
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262
263#ifdef INET
264 /*
265 * This keeps the multicast addresses from showing up
266 * in `arp -a' listings as unresolved. It's not actually
267 * functional. Then the same for broadcast.
268 */
ce6da440 269 if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr))) {
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270 ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr,
271 LLADDR(SDL(gate)));
272 SDL(gate)->sdl_alen = 6;
273 rt->rt_expire = 0;
274 }
275 if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) {
c401f0fd 276 memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr,
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277 rt->rt_ifp->if_addrlen);
278 SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen;
279 rt->rt_expire = 0;
280 }
281#endif
282
283 if (SIN(rt_key(rt))->sin_addr.s_addr ==
284 (IA_SIN(rt->rt_ifa))->sin_addr.s_addr) {
f23061d4
JH
285 /*
286 * This test used to be
287 * if (loif.if_flags & IFF_UP)
288 * It allowed local traffic to be forced
289 * through the hardware by configuring the
290 * loopback down. However, it causes problems
291 * during network configuration for boards
292 * that can't receive packets they send. It
293 * is now necessary to clear "useloopback" and
294 * remove the route to force traffic out to
295 * the hardware.
296 */
984263bc 297 rt->rt_expire = 0;
2e9572df 298 bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)),
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299 SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen);
300 if (useloopback)
301 rt->rt_ifp = loif;
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302 }
303 break;
304
305 case RTM_DELETE:
f23061d4 306 if (la == NULL)
984263bc 307 break;
984263bc 308 LIST_REMOVE(la, la_le);
f23061d4 309 rt->rt_llinfo = NULL;
984263bc 310 rt->rt_flags &= ~RTF_LLINFO;
f23061d4 311 if (la->la_hold != NULL)
984263bc 312 m_freem(la->la_hold);
f23061d4 313 Free(la);
799975d0 314 break;
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315 }
316}
317
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318static struct mbuf *
319arpreq_alloc(struct ifnet *ifp, struct in_addr *sip, struct in_addr *tip,
320 const u_char *enaddr)
984263bc 321{
2256ba69 322 struct mbuf *m;
2256ba69 323 struct arphdr *ah;
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MD
324 u_short ar_hrd;
325
74f1caca 326 if ((m = m_gethdr(MB_DONTWAIT, MT_DATA)) == NULL)
77e3dc77 327 return NULL;
69e8ff02 328 m->m_pkthdr.rcvif = NULL;
f23061d4 329
984263bc 330 switch (ifp->if_type) {
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MD
331 case IFT_ETHER:
332 /*
333 * This may not be correct for types not explicitly
334 * listed, but this is our best guess
335 */
336 default:
337 ar_hrd = htons(ARPHRD_ETHER);
338
339 m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
340 m->m_pkthdr.len = m->m_len;
341 MH_ALIGN(m, m->m_len);
342
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343 ah = mtod(m, struct arphdr *);
344 break;
345 }
346
347 ah->ar_hrd = ar_hrd;
348 ah->ar_pro = htons(ETHERTYPE_IP);
349 ah->ar_hln = ifp->if_addrlen; /* hardware address length */
350 ah->ar_pln = sizeof(struct in_addr); /* protocol address length */
351 ah->ar_op = htons(ARPOP_REQUEST);
f23061d4 352 memcpy(ar_sha(ah), enaddr, ah->ar_hln);
984263bc 353 memset(ar_tha(ah), 0, ah->ar_hln);
f23061d4
JH
354 memcpy(ar_spa(ah), sip, ah->ar_pln);
355 memcpy(ar_tpa(ah), tip, ah->ar_pln);
984263bc 356
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357 return m;
358}
359
360static void
361arpreq_send(struct ifnet *ifp, struct mbuf *m)
362{
363 struct sockaddr sa;
364 struct ether_header *eh;
365
366 switch (ifp->if_type) {
367 case IFT_ETHER:
368 /*
369 * This may not be correct for types not explicitly
370 * listed, but this is our best guess
371 */
372 default:
373 eh = (struct ether_header *)sa.sa_data;
374 /* if_output() will not swap */
375 eh->ether_type = htons(ETHERTYPE_ARP);
376 memcpy(eh->ether_dhost, ifp->if_broadcastaddr, ifp->if_addrlen);
377 break;
378 }
379
984263bc 380 sa.sa_family = AF_UNSPEC;
77e3dc77 381 sa.sa_len = sizeof(sa);
799975d0 382 ifp->if_output(ifp, m, &sa, NULL);
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MD
383}
384
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SZ
385static void
386arpreq_send_handler(struct netmsg *nmsg)
387{
388 struct mbuf *m = ((struct netmsg_packet *)nmsg)->nm_packet;
389 struct ifnet *ifp = nmsg->nm_lmsg.u.ms_resultp;
390
391 arpreq_send(ifp, m);
392 /* nmsg was embedded in the mbuf, do not reply! */
393}
394
395/*
396 * Broadcast an ARP request. Caller specifies:
397 * - arp header source ip address
398 * - arp header target ip address
399 * - arp header source ethernet address
400 *
401 * NOTE: Caller MUST NOT hold ifp's serializer
402 */
403static void
404arprequest(struct ifnet *ifp, struct in_addr *sip, struct in_addr *tip,
405 const u_char *enaddr)
406{
407 struct mbuf *m;
408
409 m = arpreq_alloc(ifp, sip, tip, enaddr);
410 if (m == NULL)
411 return;
412 arpreq_send(ifp, m);
413}
414
415/*
416 * Same as arprequest(), except:
417 * - Caller is allowed to hold ifp's serializer
418 * - Network output is done in TDF_NETWORK kernel thread
419 */
420static void
421arprequest_async(struct ifnet *ifp, struct in_addr *sip, struct in_addr *tip,
422 const u_char *enaddr)
423{
424 struct mbuf *m;
425 struct netmsg_packet *pmsg;
426
427 m = arpreq_alloc(ifp, sip, tip, enaddr);
428 if (m == NULL)
429 return;
430
431 pmsg = &m->m_hdr.mh_netmsg;
432 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport, 0,
433 arpreq_send_handler);
434 pmsg->nm_packet = m;
435 pmsg->nm_netmsg.nm_lmsg.u.ms_resultp = ifp;
436
437 lwkt_sendmsg(cpu_portfn(mycpuid), &pmsg->nm_netmsg.nm_lmsg);
438}
439
984263bc
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440/*
441 * Resolve an IP address into an ethernet address. If success,
442 * desten is filled in. If there is no entry in arptab,
443 * set one up and broadcast a request for the IP address.
444 * Hold onto this mbuf and resend it once the address
445 * is finally resolved. A return value of 1 indicates
446 * that desten has been filled in and the packet should be sent
447 * normally; a 0 return indicates that the packet has been
448 * taken over here, either now or for later transmission.
449 */
450int
799975d0
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451arpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m,
452 struct sockaddr *dst, u_char *desten)
984263bc 453{
f23061d4
JH
454 struct rtentry *rt;
455 struct llinfo_arp *la = NULL;
984263bc
MD
456 struct sockaddr_dl *sdl;
457
458 if (m->m_flags & M_BCAST) { /* broadcast */
c401f0fd 459 memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen);
984263bc
MD
460 return (1);
461 }
ce6da440 462 if (m->m_flags & M_MCAST) {/* multicast */
984263bc 463 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten);
f23061d4 464 return (1);
984263bc 465 }
f23061d4
JH
466 if (rt0 != NULL) {
467 if (rt_llroute(dst, rt0, &rt) != 0) {
468 m_freem(m);
469 return 0;
470 }
471 la = rt->rt_llinfo;
472 }
473 if (la == NULL) {
474 la = arplookup(SIN(dst)->sin_addr.s_addr, TRUE, FALSE);
475 if (la != NULL)
984263bc
MD
476 rt = la->la_rt;
477 }
f23061d4 478 if (la == NULL || rt == NULL) {
984263bc 479 log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n",
5fe66e68
JH
480 inet_ntoa(SIN(dst)->sin_addr), la ? "la" : " ",
481 rt ? "rt" : "");
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MD
482 m_freem(m);
483 return (0);
484 }
485 sdl = SDL(rt->rt_gateway);
486 /*
487 * Check the address family and length is valid, the address
488 * is resolved; otherwise, try to resolve.
489 */
490 if ((rt->rt_expire == 0 || rt->rt_expire > time_second) &&
491 sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) {
492 /*
493 * If entry has an expiry time and it is approaching,
494 * see if we need to send an ARP request within this
495 * arpt_down interval.
496 */
497 if ((rt->rt_expire != 0) &&
a916e847 498 (time_second + la->la_preempt > rt->rt_expire)) {
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499 arprequest(ifp,
500 &SIN(rt->rt_ifa->ifa_addr)->sin_addr,
501 &SIN(dst)->sin_addr,
502 IF_LLADDR(ifp));
a916e847 503 la->la_preempt--;
f23061d4 504 }
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MD
505
506 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
507 return 1;
508 }
509 /*
510 * If ARP is disabled on this interface, stop.
511 * XXX
512 * Probably should not allocate empty llinfo struct if we are
513 * not going to be sending out an arp request.
514 */
515 if (ifp->if_flags & IFF_NOARP) {
516 m_freem(m);
517 return (0);
518 }
519 /*
520 * There is an arptab entry, but no ethernet address
521 * response yet. Replace the held mbuf with this
522 * latest one.
523 */
f23061d4 524 if (la->la_hold != NULL)
984263bc
MD
525 m_freem(la->la_hold);
526 la->la_hold = m;
a6f79f3a
SZ
527 if (curthread->td_flags & TDF_NETWORK)
528 la->la_msgport = &curthread->td_msgport;
529 else
530 la->la_msgport = cpu_portfn(mycpuid);
03f869ef 531 if (rt->rt_expire || ((rt->rt_flags & RTF_STATIC) && !sdl->sdl_alen)) {
984263bc
MD
532 rt->rt_flags &= ~RTF_REJECT;
533 if (la->la_asked == 0 || rt->rt_expire != time_second) {
534 rt->rt_expire = time_second;
535 if (la->la_asked++ < arp_maxtries) {
536 arprequest(ifp,
537 &SIN(rt->rt_ifa->ifa_addr)->sin_addr,
538 &SIN(dst)->sin_addr,
539 IF_LLADDR(ifp));
540 } else {
541 rt->rt_flags |= RTF_REJECT;
542 rt->rt_expire += arpt_down;
a916e847
JH
543 la->la_asked = 0;
544 la->la_preempt = arp_maxtries;
984263bc 545 }
984263bc
MD
546 }
547 }
548 return (0);
549}
550
551/*
552 * Common length and type checks are done here,
553 * then the protocol-specific routine is called.
554 */
4599cf19 555static void
9eeaa8a9 556arpintr(struct netmsg *msg)
984263bc 557{
9eeaa8a9 558 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
2256ba69 559 struct arphdr *ar;
8bde602d 560 u_short ar_hrd;
984263bc 561
8bde602d 562 if (m->m_len < sizeof(struct arphdr) &&
db597c8a 563 (m = m_pullup(m, sizeof(struct arphdr))) == NULL) {
8bde602d 564 log(LOG_ERR, "arp: runt packet -- m_pullup failed\n");
db597c8a 565 return;
8bde602d
JH
566 }
567 ar = mtod(m, struct arphdr *);
568
569 ar_hrd = ntohs(ar->ar_hrd);
db597c8a
SZ
570 if (ar_hrd != ARPHRD_ETHER && ar_hrd != ARPHRD_IEEE802) {
571 log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n",
8bde602d 572 (unsigned char *)&ar->ar_hrd, "");
db597c8a
SZ
573 m_freem(m);
574 return;
8bde602d 575 }
984263bc 576
db597c8a
SZ
577 if (m->m_pkthdr.len < arphdr_len(ar)) {
578 if ((m = m_pullup(m, arphdr_len(ar))) == NULL) {
579 log(LOG_ERR, "arp: runt packet\n");
580 return;
581 }
582 ar = mtod(m, struct arphdr *);
8bde602d
JH
583 }
584
585 switch (ntohs(ar->ar_pro)) {
984263bc 586#ifdef INET
db597c8a
SZ
587 case ETHERTYPE_IP:
588 in_arpinput(m);
589 return;
984263bc 590#endif
984263bc 591 }
8bde602d 592 m_freem(m);
6aad077d 593 /* msg was embedded in the mbuf, do not reply! */
984263bc
MD
594}
595
596#ifdef INET
597/*
598 * ARP for Internet protocols on 10 Mb/s Ethernet.
599 * Algorithm is that given in RFC 826.
600 * In addition, a sanity check is performed on the sender
601 * protocol address, to catch impersonators.
602 * We no longer handle negotiations for use of trailer protocol:
603 * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent
604 * along with IP replies if we wanted trailers sent to us,
605 * and also sent them in response to IP replies.
606 * This allowed either end to announce the desire to receive
607 * trailer packets.
608 * We no longer reply to requests for ETHERTYPE_TRAIL protocol either,
609 * but formerly didn't normally send requests.
610 */
611static int log_arp_wrong_iface = 1;
984263bc 612SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW,
799975d0
SZ
613 &log_arp_wrong_iface, 0,
614 "log arp packets arriving on the wrong interface");
984263bc 615
a6f79f3a
SZ
616static void
617arp_hold_output(struct netmsg *nmsg)
618{
619 struct mbuf *m = ((struct netmsg_packet *)nmsg)->nm_packet;
620 struct rtentry *rt;
621 struct ifnet *ifp;
622
623 rt = nmsg->nm_lmsg.u.ms_resultp;
624 ifp = m->m_pkthdr.rcvif;
625 m->m_pkthdr.rcvif = NULL;
626
627 ifp->if_output(ifp, m, rt_key(rt), rt);
628
629 /* Drop the reference count bumped by the sender */
630 RTFREE(rt);
631
632 /* nmsg was embedded in the mbuf, do not reply! */
633}
634
ecdefdda
MD
635static void
636arp_update_oncpu(struct mbuf *m, in_addr_t saddr, boolean_t create,
637 boolean_t dologging)
638{
639 struct arphdr *ah = mtod(m, struct arphdr *);
640 struct ifnet *ifp = m->m_pkthdr.rcvif;
641 struct llinfo_arp *la;
642 struct sockaddr_dl *sdl;
643 struct rtentry *rt;
ecdefdda
MD
644
645 la = arplookup(saddr, create, FALSE);
646 if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) {
647 struct in_addr isaddr = { saddr };
648
649 /* the following is not an error when doing bridging */
a8d45119 650 if (rt->rt_ifp != ifp) {
e090f4c1 651 if (dologging && log_arp_wrong_iface) {
ecdefdda
MD
652 log(LOG_ERR,
653 "arp: %s is on %s "
654 "but got reply from %*D on %s\n",
655 inet_ntoa(isaddr),
656 rt->rt_ifp->if_xname,
657 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
658 ifp->if_xname);
659 }
660 return;
661 }
662 if (sdl->sdl_alen &&
663 bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) {
664 if (rt->rt_expire != 0) {
e090f4c1 665 if (dologging) {
ecdefdda
MD
666 log(LOG_INFO,
667 "arp: %s moved from %*D to %*D on %s\n",
668 inet_ntoa(isaddr),
669 ifp->if_addrlen, (u_char *)LLADDR(sdl),
670 ":", ifp->if_addrlen,
671 (u_char *)ar_sha(ah), ":",
672 ifp->if_xname);
673 }
674 } else {
e090f4c1 675 if (dologging) {
ecdefdda 676 log(LOG_ERR,
799975d0
SZ
677 "arp: %*D attempts to modify "
678 "permanent entry for %s on %s\n",
679 ifp->if_addrlen, (u_char *)ar_sha(ah),
680 ":", inet_ntoa(isaddr), ifp->if_xname);
ecdefdda
MD
681 }
682 return;
683 }
684 }
685 /*
686 * sanity check for the address length.
687 * XXX this does not work for protocols with variable address
688 * length. -is
689 */
e090f4c1 690 if (dologging && sdl->sdl_alen && sdl->sdl_alen != ah->ar_hln) {
ecdefdda
MD
691 log(LOG_WARNING,
692 "arp from %*D: new addr len %d, was %d",
693 ifp->if_addrlen, (u_char *) ar_sha(ah), ":",
694 ah->ar_hln, sdl->sdl_alen);
695 }
696 if (ifp->if_addrlen != ah->ar_hln) {
e090f4c1 697 if (dologging) {
ecdefdda 698 log(LOG_WARNING,
799975d0
SZ
699 "arp from %*D: addr len: new %d, i/f %d "
700 "(ignored)",
ecdefdda
MD
701 ifp->if_addrlen, (u_char *) ar_sha(ah), ":",
702 ah->ar_hln, ifp->if_addrlen);
703 }
704 return;
705 }
706 memcpy(LLADDR(sdl), ar_sha(ah), sdl->sdl_alen = ah->ar_hln);
ecdefdda
MD
707 if (rt->rt_expire != 0)
708 rt->rt_expire = time_second + arpt_keep;
709 rt->rt_flags &= ~RTF_REJECT;
710 la->la_asked = 0;
711 la->la_preempt = arp_maxtries;
712
713 /*
714 * This particular cpu might have been holding an mbuf
715 * pending ARP resolution. If so, transmit the mbuf now.
716 */
717 if (la->la_hold != NULL) {
a6f79f3a
SZ
718 struct mbuf *m = la->la_hold;
719 struct lwkt_port *port = la->la_msgport;
720 struct netmsg_packet *pmsg;
721
ecdefdda 722 la->la_hold = NULL;
a6f79f3a
SZ
723 la->la_msgport = NULL;
724
725 m_adj(m, sizeof(struct ether_header));
726
727 /*
728 * Make sure that this rtentry will not be freed
729 * before the packet is processed on the target
730 * msgport. The reference count will be dropped
731 * in the handler associated with this packet.
732 */
733 rt->rt_refcnt++;
734
735 pmsg = &m->m_hdr.mh_netmsg;
736 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport,
b95665d8 737 MSGF_MPSAFE, arp_hold_output);
a6f79f3a
SZ
738 pmsg->nm_packet = m;
739
740 /* Record necessary information */
741 m->m_pkthdr.rcvif = ifp;
742 pmsg->nm_netmsg.nm_lmsg.u.ms_resultp = rt;
743
744 lwkt_sendmsg(port, &pmsg->nm_netmsg.nm_lmsg);
ecdefdda
MD
745 }
746 }
747}
748
749#ifdef SMP
750
751struct netmsg_arp_update {
4599cf19 752 struct netmsg netmsg;
ecdefdda
MD
753 struct mbuf *m;
754 in_addr_t saddr;
755 boolean_t create;
756};
757
799975d0 758static void arp_update_msghandler(struct netmsg *);
ecdefdda
MD
759
760#endif
761
762/*
763 * Called from arpintr() - this routine is run from a single cpu.
764 */
984263bc 765static void
f23061d4 766in_arpinput(struct mbuf *m)
984263bc 767{
2256ba69
RG
768 struct arphdr *ah;
769 struct ifnet *ifp = m->m_pkthdr.rcvif;
984263bc 770 struct ether_header *eh;
2256ba69 771 struct rtentry *rt;
b2632176 772 struct ifaddr_container *ifac;
f8983475 773 struct in_ifaddr_container *iac;
984263bc 774 struct in_ifaddr *ia;
984263bc
MD
775 struct sockaddr sa;
776 struct in_addr isaddr, itaddr, myaddr;
ecdefdda
MD
777#ifdef SMP
778 struct netmsg_arp_update msg;
779#endif
0d16ba1d 780 u_int8_t *enaddr = NULL;
ecdefdda 781 int op;
984263bc
MD
782 int req_len;
783
784 req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
785 if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) {
786 log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n");
787 return;
788 }
789
790 ah = mtod(m, struct arphdr *);
791 op = ntohs(ah->ar_op);
f23061d4
JH
792 memcpy(&isaddr, ar_spa(ah), sizeof isaddr);
793 memcpy(&itaddr, ar_tpa(ah), sizeof itaddr);
984263bc 794 /*
ed5bc924
SS
795 * Check both target and sender IP addresses:
796 *
797 * If we receive the packet on the interface owning the address,
798 * then accept the address.
799 *
800 * For a bridge, we accept the address if the receive interface and
801 * the interface owning the address are on the same bridge.
802 * (This will change slightly when we have clusters of interfaces).
984263bc 803 */
f8983475
SZ
804 LIST_FOREACH(iac, INADDR_HASH(itaddr.s_addr), ia_hash) {
805 ia = iac->ia;
806
ed5bc924
SS
807 /* Skip all ia's which don't match */
808 if (itaddr.s_addr != ia->ia_addr.sin_addr.s_addr)
809 continue;
810
811 if (ia->ia_ifp == ifp)
812 goto match;
813
ac93838f 814 if (ifp->if_bridge && ia->ia_ifp &&
ed5bc924 815 ifp->if_bridge == ia->ia_ifp->if_bridge)
ac93838f 816 goto match;
0d16ba1d
MD
817
818#ifdef CARP
799975d0
SZ
819 /*
820 * If the interface does not match, but the recieving interface
821 * is part of carp, we call carp_iamatch to see if this is a
822 * request for the virtual host ip.
823 * XXX: This is really ugly!
824 */
ed2327fe
SZ
825 if (ifp->if_carp != NULL) {
826 get_mplock();
827 if (ifp->if_carp != NULL &&
828 carp_iamatch(ifp->if_carp, ia, &isaddr, &enaddr)) {
829 rel_mplock();
830 goto match;
831 }
832 rel_mplock();
833 }
0d16ba1d 834#endif
ac93838f 835 }
f8983475
SZ
836 LIST_FOREACH(iac, INADDR_HASH(isaddr.s_addr), ia_hash) {
837 ia = iac->ia;
838
ed5bc924
SS
839 /* Skip all ia's which don't match */
840 if (isaddr.s_addr != ia->ia_addr.sin_addr.s_addr)
841 continue;
842
843 if (ia->ia_ifp == ifp)
844 goto match;
845
ac93838f 846 if (ifp->if_bridge && ia->ia_ifp &&
ed5bc924 847 ifp->if_bridge == ia->ia_ifp->if_bridge)
ac93838f 848 goto match;
ac93838f 849 }
984263bc
MD
850 /*
851 * No match, use the first inet address on the receive interface
852 * as a dummy address for the rest of the function.
853 */
b2632176
SZ
854 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
855 struct ifaddr *ifa = ifac->ifa;
856
984263bc
MD
857 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
858 ia = ifatoia(ifa);
859 goto match;
860 }
984263bc 861 }
ed5bc924
SS
862 /*
863 * If we got here, we didn't find any suitable interface,
864 * so drop the packet.
865 */
866 m_freem(m);
867 return;
868
984263bc 869match:
0d16ba1d
MD
870 if (!enaddr)
871 enaddr = (u_int8_t *)IF_LLADDR(ifp);
984263bc 872 myaddr = ia->ia_addr.sin_addr;
0d16ba1d 873 if (!bcmp(ar_sha(ah), enaddr, ifp->if_addrlen)) {
984263bc
MD
874 m_freem(m); /* it's from me, ignore it. */
875 return;
876 }
c401f0fd 877 if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) {
984263bc
MD
878 log(LOG_ERR,
879 "arp: link address is broadcast for IP address %s!\n",
880 inet_ntoa(isaddr));
881 m_freem(m);
882 return;
883 }
c3749f74 884 if (isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) {
984263bc
MD
885 log(LOG_ERR,
886 "arp: %*D is using my IP address %s!\n",
887 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
888 inet_ntoa(isaddr));
889 itaddr = myaddr;
890 goto reply;
891 }
ecdefdda 892#ifdef SMP
4599cf19
MD
893 netmsg_init(&msg.netmsg, &curthread->td_msgport, 0,
894 arp_update_msghandler);
ecdefdda
MD
895 msg.m = m;
896 msg.saddr = isaddr.s_addr;
897 msg.create = (itaddr.s_addr == myaddr.s_addr);
a22c590e 898 lwkt_domsg(rtable_portfn(0), &msg.netmsg.nm_lmsg, 0);
e090f4c1 899#else
ecdefdda
MD
900 arp_update_oncpu(m, isaddr.s_addr, (itaddr.s_addr == myaddr.s_addr),
901 TRUE);
e090f4c1 902#endif
984263bc
MD
903reply:
904 if (op != ARPOP_REQUEST) {
905 m_freem(m);
906 return;
907 }
908 if (itaddr.s_addr == myaddr.s_addr) {
909 /* I am the target */
f23061d4 910 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
0d16ba1d 911 memcpy(ar_sha(ah), enaddr, ah->ar_hln);
984263bc 912 } else {
ecdefdda
MD
913 struct llinfo_arp *la;
914
f23061d4 915 la = arplookup(itaddr.s_addr, FALSE, SIN_PROXY);
984263bc
MD
916 if (la == NULL) {
917 struct sockaddr_in sin;
918
919 if (!arp_proxyall) {
920 m_freem(m);
921 return;
922 }
923
924 bzero(&sin, sizeof sin);
925 sin.sin_family = AF_INET;
926 sin.sin_len = sizeof sin;
927 sin.sin_addr = itaddr;
928
f3ed2586 929 rt = rtpurelookup((struct sockaddr *)&sin);
0c3c561c 930 if (rt == NULL) {
984263bc
MD
931 m_freem(m);
932 return;
933 }
be23faf1 934 --rt->rt_refcnt;
984263bc
MD
935 /*
936 * Don't send proxies for nodes on the same interface
937 * as this one came out of, or we'll get into a fight
938 * over who claims what Ether address.
939 */
940 if (rt->rt_ifp == ifp) {
984263bc
MD
941 m_freem(m);
942 return;
943 }
f23061d4 944 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
0d16ba1d 945 memcpy(ar_sha(ah), enaddr, ah->ar_hln);
984263bc 946#ifdef DEBUG_PROXY
a6ec04bc 947 kprintf("arp: proxying for %s\n", inet_ntoa(itaddr));
984263bc
MD
948#endif
949 } else {
ecdefdda
MD
950 struct sockaddr_dl *sdl;
951
984263bc 952 rt = la->la_rt;
f23061d4 953 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
984263bc 954 sdl = SDL(rt->rt_gateway);
f23061d4 955 memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln);
984263bc
MD
956 }
957 }
958
f23061d4
JH
959 memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln);
960 memcpy(ar_spa(ah), &itaddr, ah->ar_pln);
984263bc
MD
961 ah->ar_op = htons(ARPOP_REPLY);
962 ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */
963 switch (ifp->if_type) {
984263bc 964 case IFT_ETHER:
984263bc
MD
965 /*
966 * May not be correct for types not explictly
967 * listed, but it is our best guess.
968 */
969 default:
970 eh = (struct ether_header *)sa.sa_data;
0c3c561c 971 memcpy(eh->ether_dhost, ar_tha(ah), sizeof eh->ether_dhost);
984263bc
MD
972 eh->ether_type = htons(ETHERTYPE_ARP);
973 break;
974 }
975 sa.sa_family = AF_UNSPEC;
0c3c561c 976 sa.sa_len = sizeof sa;
799975d0 977 ifp->if_output(ifp, m, &sa, NULL);
984263bc 978}
ecdefdda
MD
979
980#ifdef SMP
981
799975d0 982static void
4599cf19 983arp_update_msghandler(struct netmsg *netmsg)
ecdefdda 984{
4599cf19 985 struct netmsg_arp_update *msg = (struct netmsg_arp_update *)netmsg;
ecdefdda
MD
986 int nextcpu;
987
e090f4c1 988 arp_update_oncpu(msg->m, msg->saddr, msg->create, mycpuid == 0);
ecdefdda
MD
989
990 nextcpu = mycpuid + 1;
799975d0 991 if (nextcpu < ncpus)
4599cf19 992 lwkt_forwardmsg(rtable_portfn(nextcpu), &msg->netmsg.nm_lmsg);
799975d0 993 else
4599cf19 994 lwkt_replymsg(&msg->netmsg.nm_lmsg, 0);
ecdefdda
MD
995}
996
799975d0 997#endif /* SMP */
ecdefdda 998
799975d0 999#endif /* INET */
984263bc
MD
1000
1001/*
03f869ef
MD
1002 * Free an arp entry. If the arp entry is actively referenced or represents
1003 * a static entry we only clear it back to an unresolved state, otherwise
1004 * we destroy the entry entirely.
1005 *
1006 * Note that static entries are created when route add ... -interface is used
1007 * to create an interface route to a (direct) destination.
984263bc
MD
1008 */
1009static void
5fe66e68 1010arptfree(struct llinfo_arp *la)
984263bc 1011{
2256ba69
RG
1012 struct rtentry *rt = la->la_rt;
1013 struct sockaddr_dl *sdl;
f23061d4 1014
03f869ef 1015 if (rt == NULL)
984263bc 1016 panic("arptfree");
03f869ef 1017 sdl = SDL(rt->rt_gateway);
5fe66e68
JH
1018 if (sdl != NULL &&
1019 ((rt->rt_refcnt > 0 && sdl->sdl_family == AF_LINK) ||
1020 (rt->rt_flags & RTF_STATIC))) {
984263bc
MD
1021 sdl->sdl_alen = 0;
1022 la->la_preempt = la->la_asked = 0;
1023 rt->rt_flags &= ~RTF_REJECT;
1024 return;
1025 }
f23061d4 1026 rtrequest(RTM_DELETE, rt_key(rt), NULL, rt_mask(rt), 0, NULL);
984263bc 1027}
0c3c561c 1028
984263bc
MD
1029/*
1030 * Lookup or enter a new address in arptab.
1031 */
1032static struct llinfo_arp *
f23061d4 1033arplookup(in_addr_t addr, boolean_t create, boolean_t proxy)
984263bc 1034{
2256ba69 1035 struct rtentry *rt;
f3ed2586 1036 struct sockaddr_inarp sin = { sizeof sin, AF_INET };
f23061d4 1037 const char *why = NULL;
984263bc
MD
1038
1039 sin.sin_addr.s_addr = addr;
1040 sin.sin_other = proxy ? SIN_PROXY : 0;
f3ed2586
JH
1041 if (create)
1042 rt = rtlookup((struct sockaddr *)&sin);
1043 else
1044 rt = rtpurelookup((struct sockaddr *)&sin);
f23061d4
JH
1045 if (rt == NULL)
1046 return (NULL);
984263bc
MD
1047 rt->rt_refcnt--;
1048
1049 if (rt->rt_flags & RTF_GATEWAY)
1050 why = "host is not on local network";
f23061d4 1051 else if (!(rt->rt_flags & RTF_LLINFO))
984263bc
MD
1052 why = "could not allocate llinfo";
1053 else if (rt->rt_gateway->sa_family != AF_LINK)
1054 why = "gateway route is not ours";
1055
8fd3e627
MD
1056 if (why) {
1057 if (create) {
1058 log(LOG_DEBUG, "arplookup %s failed: %s\n",
1059 inet_ntoa(sin.sin_addr), why);
1060 }
f23061d4
JH
1061 if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_WASCLONED)) {
1062 /* No references to this route. Purge it. */
1063 rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
be23faf1 1064 rt_mask(rt), rt->rt_flags, NULL);
8fd3e627 1065 }
f23061d4 1066 return (NULL);
984263bc 1067 }
f23061d4 1068 return (rt->rt_llinfo);
984263bc
MD
1069}
1070
1071void
f23061d4 1072arp_ifinit(struct ifnet *ifp, struct ifaddr *ifa)
984263bc 1073{
57dff79c 1074 if (IA_SIN(ifa)->sin_addr.s_addr != INADDR_ANY) {
77e3dc77
SZ
1075 arprequest_async(ifp, &IA_SIN(ifa)->sin_addr,
1076 &IA_SIN(ifa)->sin_addr, IF_LLADDR(ifp));
57dff79c 1077 }
984263bc
MD
1078 ifa->ifa_rtrequest = arp_rtrequest;
1079 ifa->ifa_flags |= RTF_CLONING;
1080}
1081
0d16ba1d
MD
1082void
1083arp_ifinit2(struct ifnet *ifp, struct ifaddr *ifa, u_char *enaddr)
1084{
77e3dc77
SZ
1085 if (IA_SIN(ifa)->sin_addr.s_addr != INADDR_ANY) {
1086 arprequest_async(ifp, &IA_SIN(ifa)->sin_addr,
1087 &IA_SIN(ifa)->sin_addr, enaddr);
1088 }
0d16ba1d
MD
1089 ifa->ifa_rtrequest = arp_rtrequest;
1090 ifa->ifa_flags |= RTF_CLONING;
1091}
1092
984263bc
MD
1093static void
1094arp_init(void)
1095{
ed2327fe 1096 uint32_t flags;
ecdefdda
MD
1097 int cpu;
1098
1099 for (cpu = 0; cpu < ncpus2; cpu++)
1100 LIST_INIT(&llinfo_arp_list[cpu]);
ed2327fe
SZ
1101
1102 if (arp_mpsafe) {
1103 flags = NETISR_FLAG_MPSAFE;
1104 kprintf("arp: MPSAFE\n");
1105 } else {
1106 flags = NETISR_FLAG_NOTMPSAFE;
1107 }
1108 netisr_register(NETISR_ARP, cpu0_portfn, arpintr, flags);
984263bc
MD
1109}
1110
1111SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0);