2 * Copyright (c) 2004, 2005 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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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.
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38 * modification, are permitted provided that the following conditions
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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 $
67 * $DragonFly: src/sys/netinet/if_ether.c,v 1.59 2008/11/22 11:03:35 sephe Exp $
71 * Ethernet address resolution protocol.
73 * add "inuse/lock" bit (or ref. count) along with valid bit
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>
85 #include <sys/malloc.h>
86 #include <sys/socket.h>
87 #include <sys/syslog.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>
97 #include <netinet/in.h>
98 #include <netinet/in_var.h>
99 #include <netinet/if_ether.h>
101 #include <sys/thread2.h>
102 #include <sys/msgport2.h>
103 #include <net/netmsg2.h>
104 #include <sys/mplock2.h>
107 #include <netinet/ip_carp.h>
110 #define SIN(s) ((struct sockaddr_in *)s)
111 #define SDL(s) ((struct sockaddr_dl *)s)
113 SYSCTL_DECL(_net_link_ether
);
114 SYSCTL_NODE(_net_link_ether
, PF_INET
, inet
, CTLFLAG_RW
, 0, "");
117 static int arpt_prune
= (5*60*1); /* walk list every 5 minutes */
118 static int arpt_keep
= (20*60); /* once resolved, good for 20 more minutes */
119 static int arpt_down
= 20; /* once declared down, don't send for 20 sec */
121 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, prune_intvl
, CTLFLAG_RW
,
123 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, max_age
, CTLFLAG_RW
,
125 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, host_down_time
, CTLFLAG_RW
,
128 #define rt_expire rt_rmx.rmx_expire
131 LIST_ENTRY(llinfo_arp
) la_le
;
132 struct rtentry
*la_rt
;
133 struct mbuf
*la_hold
; /* last packet until resolved/timeout */
134 struct lwkt_port
*la_msgport
; /* last packet's msgport */
135 u_short la_preempt
; /* countdown for pre-expiry arps */
136 u_short la_asked
; /* #times we QUERIED following expiration */
139 static LIST_HEAD(, llinfo_arp
) llinfo_arp_list
[MAXCPU
];
141 static int arp_maxtries
= 5;
142 static int useloopback
= 1; /* use loopback interface for local traffic */
143 static int arp_proxyall
= 0;
145 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, maxtries
, CTLFLAG_RW
,
146 &arp_maxtries
, 0, "ARP resolution attempts before returning error");
147 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, useloopback
, CTLFLAG_RW
,
148 &useloopback
, 0, "Use the loopback interface for local traffic");
149 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, proxyall
, CTLFLAG_RW
,
150 &arp_proxyall
, 0, "Enable proxy ARP for all suitable requests");
152 static int arp_mpsafe
= 1;
153 TUNABLE_INT("net.link.ether.inet.arp_mpsafe", &arp_mpsafe
);
155 static void arp_rtrequest(int, struct rtentry
*, struct rt_addrinfo
*);
156 static void arprequest(struct ifnet
*, const struct in_addr
*,
157 const struct in_addr
*, const u_char
*);
158 static void arprequest_async(struct ifnet
*, const struct in_addr
*,
159 const struct in_addr
*, const u_char
*);
160 static void arpintr(struct netmsg
*);
161 static void arptfree(struct llinfo_arp
*);
162 static void arptimer(void *);
163 static struct llinfo_arp
*
164 arplookup(in_addr_t
, boolean_t
, boolean_t
, boolean_t
);
166 static void in_arpinput(struct mbuf
*);
169 static struct callout arptimer_ch
[MAXCPU
];
172 * Timeout routine. Age arp_tab entries periodically.
176 arptimer(void *ignored_arg
)
178 struct llinfo_arp
*la
, *nla
;
181 LIST_FOREACH_MUTABLE(la
, &llinfo_arp_list
[mycpuid
], la_le
, nla
) {
182 if (la
->la_rt
->rt_expire
&& la
->la_rt
->rt_expire
<= time_second
)
185 callout_reset(&arptimer_ch
[mycpuid
], arpt_prune
* hz
, arptimer
, NULL
);
190 * Parallel to llc_rtrequest.
193 arp_rtrequest(int req
, struct rtentry
*rt
, struct rt_addrinfo
*info
)
195 struct sockaddr
*gate
= rt
->rt_gateway
;
196 struct llinfo_arp
*la
= rt
->rt_llinfo
;
198 struct sockaddr_dl null_sdl
= { sizeof null_sdl
, AF_LINK
};
199 static boolean_t arpinit_done
[MAXCPU
];
201 if (!arpinit_done
[mycpuid
]) {
202 arpinit_done
[mycpuid
] = TRUE
;
203 callout_init(&arptimer_ch
[mycpuid
]);
204 callout_reset(&arptimer_ch
[mycpuid
], hz
, arptimer
, NULL
);
206 if (rt
->rt_flags
& RTF_GATEWAY
)
212 * XXX: If this is a manually added route to interface
213 * such as older version of routed or gated might provide,
214 * restore cloning bit.
216 if (!(rt
->rt_flags
& RTF_HOST
) &&
217 SIN(rt_mask(rt
))->sin_addr
.s_addr
!= 0xffffffff)
218 rt
->rt_flags
|= RTF_CLONING
;
219 if (rt
->rt_flags
& RTF_CLONING
) {
221 * Case 1: This route should come from a route to iface.
223 rt_setgate(rt
, rt_key(rt
),
224 (struct sockaddr
*)&null_sdl
,
226 gate
= rt
->rt_gateway
;
227 SDL(gate
)->sdl_type
= rt
->rt_ifp
->if_type
;
228 SDL(gate
)->sdl_index
= rt
->rt_ifp
->if_index
;
229 rt
->rt_expire
= time_second
;
232 /* Announce a new entry if requested. */
233 if (rt
->rt_flags
& RTF_ANNOUNCE
) {
234 arprequest_async(rt
->rt_ifp
,
235 &SIN(rt_key(rt
))->sin_addr
,
236 &SIN(rt_key(rt
))->sin_addr
,
241 if (gate
->sa_family
!= AF_LINK
||
242 gate
->sa_len
< sizeof(struct sockaddr_dl
)) {
243 log(LOG_DEBUG
, "arp_rtrequest: bad gateway value\n");
246 SDL(gate
)->sdl_type
= rt
->rt_ifp
->if_type
;
247 SDL(gate
)->sdl_index
= rt
->rt_ifp
->if_index
;
249 break; /* This happens on a route change */
251 * Case 2: This route may come from cloning, or a manual route
252 * add with a LL address.
254 R_Malloc(la
, struct llinfo_arp
*, sizeof *la
);
257 log(LOG_DEBUG
, "arp_rtrequest: malloc failed\n");
260 bzero(la
, sizeof *la
);
262 rt
->rt_flags
|= RTF_LLINFO
;
263 LIST_INSERT_HEAD(&llinfo_arp_list
[mycpuid
], la
, la_le
);
267 * This keeps the multicast addresses from showing up
268 * in `arp -a' listings as unresolved. It's not actually
269 * functional. Then the same for broadcast.
271 if (IN_MULTICAST(ntohl(SIN(rt_key(rt
))->sin_addr
.s_addr
))) {
272 ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt
))->sin_addr
,
274 SDL(gate
)->sdl_alen
= 6;
277 if (in_broadcast(SIN(rt_key(rt
))->sin_addr
, rt
->rt_ifp
)) {
278 memcpy(LLADDR(SDL(gate
)), rt
->rt_ifp
->if_broadcastaddr
,
279 rt
->rt_ifp
->if_addrlen
);
280 SDL(gate
)->sdl_alen
= rt
->rt_ifp
->if_addrlen
;
285 if (SIN(rt_key(rt
))->sin_addr
.s_addr
==
286 (IA_SIN(rt
->rt_ifa
))->sin_addr
.s_addr
) {
288 * This test used to be
289 * if (loif.if_flags & IFF_UP)
290 * It allowed local traffic to be forced
291 * through the hardware by configuring the
292 * loopback down. However, it causes problems
293 * during network configuration for boards
294 * that can't receive packets they send. It
295 * is now necessary to clear "useloopback" and
296 * remove the route to force traffic out to
300 bcopy(IF_LLADDR(rt
->rt_ifp
), LLADDR(SDL(gate
)),
301 SDL(gate
)->sdl_alen
= rt
->rt_ifp
->if_addrlen
);
310 LIST_REMOVE(la
, la_le
);
311 rt
->rt_llinfo
= NULL
;
312 rt
->rt_flags
&= ~RTF_LLINFO
;
313 if (la
->la_hold
!= NULL
)
314 m_freem(la
->la_hold
);
321 arpreq_alloc(struct ifnet
*ifp
, const struct in_addr
*sip
,
322 const struct in_addr
*tip
, const u_char
*enaddr
)
328 if ((m
= m_gethdr(MB_DONTWAIT
, MT_DATA
)) == NULL
)
330 m
->m_pkthdr
.rcvif
= NULL
;
332 switch (ifp
->if_type
) {
335 * This may not be correct for types not explicitly
336 * listed, but this is our best guess
339 ar_hrd
= htons(ARPHRD_ETHER
);
341 m
->m_len
= arphdr_len2(ifp
->if_addrlen
, sizeof(struct in_addr
));
342 m
->m_pkthdr
.len
= m
->m_len
;
343 MH_ALIGN(m
, m
->m_len
);
345 ah
= mtod(m
, struct arphdr
*);
350 ah
->ar_pro
= htons(ETHERTYPE_IP
);
351 ah
->ar_hln
= ifp
->if_addrlen
; /* hardware address length */
352 ah
->ar_pln
= sizeof(struct in_addr
); /* protocol address length */
353 ah
->ar_op
= htons(ARPOP_REQUEST
);
354 memcpy(ar_sha(ah
), enaddr
, ah
->ar_hln
);
355 memset(ar_tha(ah
), 0, ah
->ar_hln
);
356 memcpy(ar_spa(ah
), sip
, ah
->ar_pln
);
357 memcpy(ar_tpa(ah
), tip
, ah
->ar_pln
);
363 arpreq_send(struct ifnet
*ifp
, struct mbuf
*m
)
366 struct ether_header
*eh
;
368 switch (ifp
->if_type
) {
371 * This may not be correct for types not explicitly
372 * listed, but this is our best guess
375 eh
= (struct ether_header
*)sa
.sa_data
;
376 /* if_output() will not swap */
377 eh
->ether_type
= htons(ETHERTYPE_ARP
);
378 memcpy(eh
->ether_dhost
, ifp
->if_broadcastaddr
, ifp
->if_addrlen
);
382 sa
.sa_family
= AF_UNSPEC
;
383 sa
.sa_len
= sizeof(sa
);
384 ifp
->if_output(ifp
, m
, &sa
, NULL
);
388 arpreq_send_handler(struct netmsg
*nmsg
)
390 struct mbuf
*m
= ((struct netmsg_packet
*)nmsg
)->nm_packet
;
391 struct ifnet
*ifp
= nmsg
->nm_lmsg
.u
.ms_resultp
;
394 /* nmsg was embedded in the mbuf, do not reply! */
398 * Broadcast an ARP request. Caller specifies:
399 * - arp header source ip address
400 * - arp header target ip address
401 * - arp header source ethernet address
403 * NOTE: Caller MUST NOT hold ifp's serializer
406 arprequest(struct ifnet
*ifp
, const struct in_addr
*sip
,
407 const struct in_addr
*tip
, const u_char
*enaddr
)
411 m
= arpreq_alloc(ifp
, sip
, tip
, enaddr
);
418 * Same as arprequest(), except:
419 * - Caller is allowed to hold ifp's serializer
420 * - Network output is done in TDF_NETWORK kernel thread
423 arprequest_async(struct ifnet
*ifp
, const struct in_addr
*sip
,
424 const struct in_addr
*tip
, const u_char
*enaddr
)
427 struct netmsg_packet
*pmsg
;
429 m
= arpreq_alloc(ifp
, sip
, tip
, enaddr
);
433 pmsg
= &m
->m_hdr
.mh_netmsg
;
434 netmsg_init(&pmsg
->nm_netmsg
, NULL
, &netisr_apanic_rport
,
435 0, arpreq_send_handler
);
437 pmsg
->nm_netmsg
.nm_lmsg
.u
.ms_resultp
= ifp
;
439 lwkt_sendmsg(cpu_portfn(mycpuid
), &pmsg
->nm_netmsg
.nm_lmsg
);
443 * Resolve an IP address into an ethernet address. If success,
444 * desten is filled in. If there is no entry in arptab,
445 * set one up and broadcast a request for the IP address.
446 * Hold onto this mbuf and resend it once the address
447 * is finally resolved. A return value of 1 indicates
448 * that desten has been filled in and the packet should be sent
449 * normally; a 0 return indicates that the packet has been
450 * taken over here, either now or for later transmission.
453 arpresolve(struct ifnet
*ifp
, struct rtentry
*rt0
, struct mbuf
*m
,
454 struct sockaddr
*dst
, u_char
*desten
)
457 struct llinfo_arp
*la
= NULL
;
458 struct sockaddr_dl
*sdl
;
460 if (m
->m_flags
& M_BCAST
) { /* broadcast */
461 memcpy(desten
, ifp
->if_broadcastaddr
, ifp
->if_addrlen
);
464 if (m
->m_flags
& M_MCAST
) {/* multicast */
465 ETHER_MAP_IP_MULTICAST(&SIN(dst
)->sin_addr
, desten
);
469 if (rt_llroute(dst
, rt0
, &rt
) != 0) {
476 la
= arplookup(SIN(dst
)->sin_addr
.s_addr
,
477 TRUE
, RTL_REPORTMSG
, FALSE
);
481 if (la
== NULL
|| rt
== NULL
) {
482 log(LOG_DEBUG
, "arpresolve: can't allocate llinfo for %s%s%s\n",
483 inet_ntoa(SIN(dst
)->sin_addr
), la
? "la" : " ",
488 sdl
= SDL(rt
->rt_gateway
);
490 * Check the address family and length is valid, the address
491 * is resolved; otherwise, try to resolve.
493 if ((rt
->rt_expire
== 0 || rt
->rt_expire
> time_second
) &&
494 sdl
->sdl_family
== AF_LINK
&& sdl
->sdl_alen
!= 0) {
496 * If entry has an expiry time and it is approaching,
497 * see if we need to send an ARP request within this
498 * arpt_down interval.
500 if ((rt
->rt_expire
!= 0) &&
501 (time_second
+ la
->la_preempt
> rt
->rt_expire
)) {
503 &SIN(rt
->rt_ifa
->ifa_addr
)->sin_addr
,
509 bcopy(LLADDR(sdl
), desten
, sdl
->sdl_alen
);
513 * If ARP is disabled or static on this interface, stop.
515 * Probably should not allocate empty llinfo struct if we are
516 * not going to be sending out an arp request.
518 if (ifp
->if_flags
& (IFF_NOARP
| IFF_STATICARP
)) {
523 * There is an arptab entry, but no ethernet address
524 * response yet. Replace the held mbuf with this
527 if (la
->la_hold
!= NULL
)
528 m_freem(la
->la_hold
);
530 la
->la_msgport
= curnetport
;
531 if (rt
->rt_expire
|| ((rt
->rt_flags
& RTF_STATIC
) && !sdl
->sdl_alen
)) {
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
) {
537 &SIN(rt
->rt_ifa
->ifa_addr
)->sin_addr
,
541 rt
->rt_flags
|= RTF_REJECT
;
542 rt
->rt_expire
+= arpt_down
;
544 la
->la_preempt
= arp_maxtries
;
552 * Common length and type checks are done here,
553 * then the protocol-specific routine is called.
556 arpintr(struct netmsg
*msg
)
558 struct mbuf
*m
= ((struct netmsg_packet
*)msg
)->nm_packet
;
562 if (m
->m_len
< sizeof(struct arphdr
) &&
563 (m
= m_pullup(m
, sizeof(struct arphdr
))) == NULL
) {
564 log(LOG_ERR
, "arp: runt packet -- m_pullup failed\n");
567 ar
= mtod(m
, struct arphdr
*);
569 ar_hrd
= ntohs(ar
->ar_hrd
);
570 if (ar_hrd
!= ARPHRD_ETHER
&& ar_hrd
!= ARPHRD_IEEE802
) {
571 log(LOG_ERR
, "arp: unknown hardware address format (0x%2D)\n",
572 (unsigned char *)&ar
->ar_hrd
, "");
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");
582 ar
= mtod(m
, struct arphdr
*);
585 switch (ntohs(ar
->ar_pro
)) {
593 /* msg was embedded in the mbuf, do not reply! */
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
608 * We no longer reply to requests for ETHERTYPE_TRAIL protocol either,
609 * but formerly didn't normally send requests.
612 static int log_arp_wrong_iface
= 1;
613 static int log_arp_movements
= 1;
614 static int log_arp_permanent_modify
= 1;
616 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, log_arp_wrong_iface
, CTLFLAG_RW
,
617 &log_arp_wrong_iface
, 0,
618 "Log arp packets arriving on the wrong interface");
619 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, log_arp_movements
, CTLFLAG_RW
,
620 &log_arp_movements
, 0,
621 "Log arp replies from MACs different than the one in the cache");
622 SYSCTL_INT(_net_link_ether_inet
, OID_AUTO
, log_arp_permanent_modify
, CTLFLAG_RW
,
623 &log_arp_permanent_modify
, 0,
624 "Log arp replies from MACs different than the one "
625 "in the permanent arp entry");
629 arp_hold_output(struct netmsg
*nmsg
)
631 struct mbuf
*m
= ((struct netmsg_packet
*)nmsg
)->nm_packet
;
635 rt
= nmsg
->nm_lmsg
.u
.ms_resultp
;
636 ifp
= m
->m_pkthdr
.rcvif
;
637 m
->m_pkthdr
.rcvif
= NULL
;
639 ifp
->if_output(ifp
, m
, rt_key(rt
), rt
);
641 /* Drop the reference count bumped by the sender */
644 /* nmsg was embedded in the mbuf, do not reply! */
648 arp_update_oncpu(struct mbuf
*m
, in_addr_t saddr
, boolean_t create
,
649 boolean_t generate_report
, boolean_t dologging
)
651 struct arphdr
*ah
= mtod(m
, struct arphdr
*);
652 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
653 struct llinfo_arp
*la
;
654 struct sockaddr_dl
*sdl
;
657 la
= arplookup(saddr
, create
, generate_report
, FALSE
);
658 if (la
&& (rt
= la
->la_rt
) && (sdl
= SDL(rt
->rt_gateway
))) {
659 struct in_addr isaddr
= { saddr
};
661 /* the following is not an error when doing bridging */
662 if (rt
->rt_ifp
!= ifp
) {
663 if (dologging
&& log_arp_wrong_iface
) {
666 "but got reply from %*D on %s\n",
668 rt
->rt_ifp
->if_xname
,
669 ifp
->if_addrlen
, (u_char
*)ar_sha(ah
), ":",
675 bcmp(ar_sha(ah
), LLADDR(sdl
), sdl
->sdl_alen
)) {
676 if (rt
->rt_expire
!= 0) {
677 if (dologging
&& log_arp_movements
) {
679 "arp: %s moved from %*D to %*D on %s\n",
681 ifp
->if_addrlen
, (u_char
*)LLADDR(sdl
),
682 ":", ifp
->if_addrlen
,
683 (u_char
*)ar_sha(ah
), ":",
687 if (dologging
&& log_arp_permanent_modify
) {
689 "arp: %*D attempts to modify "
690 "permanent entry for %s on %s\n",
691 ifp
->if_addrlen
, (u_char
*)ar_sha(ah
),
692 ":", inet_ntoa(isaddr
), ifp
->if_xname
);
698 * sanity check for the address length.
699 * XXX this does not work for protocols with variable address
702 if (dologging
&& sdl
->sdl_alen
&& sdl
->sdl_alen
!= ah
->ar_hln
) {
704 "arp from %*D: new addr len %d, was %d",
705 ifp
->if_addrlen
, (u_char
*) ar_sha(ah
), ":",
706 ah
->ar_hln
, sdl
->sdl_alen
);
708 if (ifp
->if_addrlen
!= ah
->ar_hln
) {
711 "arp from %*D: addr len: new %d, i/f %d "
713 ifp
->if_addrlen
, (u_char
*) ar_sha(ah
), ":",
714 ah
->ar_hln
, ifp
->if_addrlen
);
718 memcpy(LLADDR(sdl
), ar_sha(ah
), sdl
->sdl_alen
= ah
->ar_hln
);
719 if (rt
->rt_expire
!= 0)
720 rt
->rt_expire
= time_second
+ arpt_keep
;
721 rt
->rt_flags
&= ~RTF_REJECT
;
723 la
->la_preempt
= arp_maxtries
;
726 * This particular cpu might have been holding an mbuf
727 * pending ARP resolution. If so, transmit the mbuf now.
729 if (la
->la_hold
!= NULL
) {
730 struct mbuf
*m
= la
->la_hold
;
731 struct lwkt_port
*port
= la
->la_msgport
;
732 struct netmsg_packet
*pmsg
;
735 la
->la_msgport
= NULL
;
737 m_adj(m
, sizeof(struct ether_header
));
740 * Make sure that this rtentry will not be freed
741 * before the packet is processed on the target
742 * msgport. The reference count will be dropped
743 * in the handler associated with this packet.
747 pmsg
= &m
->m_hdr
.mh_netmsg
;
748 netmsg_init(&pmsg
->nm_netmsg
, NULL
,
749 &netisr_apanic_rport
,
750 MSGF_MPSAFE
| MSGF_PRIORITY
,
754 /* Record necessary information */
755 m
->m_pkthdr
.rcvif
= ifp
;
756 pmsg
->nm_netmsg
.nm_lmsg
.u
.ms_resultp
= rt
;
758 lwkt_sendmsg(port
, &pmsg
->nm_netmsg
.nm_lmsg
);
765 struct netmsg_arp_update
{
766 struct netmsg netmsg
;
772 static void arp_update_msghandler(struct netmsg
*);
777 * Called from arpintr() - this routine is run from a single cpu.
780 in_arpinput(struct mbuf
*m
)
783 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
784 struct ether_header
*eh
;
786 struct ifaddr_container
*ifac
;
787 struct in_ifaddr_container
*iac
;
788 struct in_ifaddr
*ia
= NULL
;
790 struct in_addr isaddr
, itaddr
, myaddr
;
792 struct netmsg_arp_update msg
;
794 uint8_t *enaddr
= NULL
;
798 req_len
= arphdr_len2(ifp
->if_addrlen
, sizeof(struct in_addr
));
799 if (m
->m_len
< req_len
&& (m
= m_pullup(m
, req_len
)) == NULL
) {
800 log(LOG_ERR
, "in_arp: runt packet -- m_pullup failed\n");
804 ah
= mtod(m
, struct arphdr
*);
805 op
= ntohs(ah
->ar_op
);
806 memcpy(&isaddr
, ar_spa(ah
), sizeof isaddr
);
807 memcpy(&itaddr
, ar_tpa(ah
), sizeof itaddr
);
809 myaddr
.s_addr
= INADDR_ANY
;
811 if (ifp
->if_carp
!= NULL
) {
813 if (ifp
->if_carp
!= NULL
&&
814 carp_iamatch(ifp
->if_carp
, &itaddr
, &isaddr
, &enaddr
)) {
824 * Check both target and sender IP addresses:
826 * If we receive the packet on the interface owning the address,
827 * then accept the address.
829 * For a bridge, we accept the address if the receive interface and
830 * the interface owning the address are on the same bridge.
831 * (This will change slightly when we have clusters of interfaces).
833 LIST_FOREACH(iac
, INADDR_HASH(itaddr
.s_addr
), ia_hash
) {
836 /* Skip all ia's which don't match */
837 if (itaddr
.s_addr
!= ia
->ia_addr
.sin_addr
.s_addr
)
840 if (ia
->ia_ifp
->if_type
== IFT_CARP
)
843 if (ia
->ia_ifp
== ifp
)
846 if (ifp
->if_bridge
&& ia
->ia_ifp
&&
847 ifp
->if_bridge
== ia
->ia_ifp
->if_bridge
)
850 LIST_FOREACH(iac
, INADDR_HASH(isaddr
.s_addr
), ia_hash
) {
853 /* Skip all ia's which don't match */
854 if (isaddr
.s_addr
!= ia
->ia_addr
.sin_addr
.s_addr
)
857 if (ia
->ia_ifp
->if_type
== IFT_CARP
)
860 if (ia
->ia_ifp
== ifp
)
863 if (ifp
->if_bridge
&& ia
->ia_ifp
&&
864 ifp
->if_bridge
== ia
->ia_ifp
->if_bridge
)
868 * No match, use the first inet address on the receive interface
869 * as a dummy address for the rest of the function.
871 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
872 struct ifaddr
*ifa
= ifac
->ifa
;
874 if (ifa
->ifa_addr
&& ifa
->ifa_addr
->sa_family
== AF_INET
) {
880 * If we got here, we didn't find any suitable interface,
881 * so drop the packet.
888 enaddr
= (uint8_t *)IF_LLADDR(ifp
);
889 if (myaddr
.s_addr
== INADDR_ANY
)
890 myaddr
= ia
->ia_addr
.sin_addr
;
891 if (!bcmp(ar_sha(ah
), enaddr
, ifp
->if_addrlen
)) {
892 m_freem(m
); /* it's from me, ignore it. */
895 if (!bcmp(ar_sha(ah
), ifp
->if_broadcastaddr
, ifp
->if_addrlen
)) {
897 "arp: link address is broadcast for IP address %s!\n",
902 if (isaddr
.s_addr
== myaddr
.s_addr
&& myaddr
.s_addr
!= 0) {
904 "arp: %*D is using my IP address %s!\n",
905 ifp
->if_addrlen
, (u_char
*)ar_sha(ah
), ":",
910 if (ifp
->if_flags
& IFF_STATICARP
)
913 netmsg_init(&msg
.netmsg
, NULL
, &curthread
->td_msgport
,
914 0, arp_update_msghandler
);
916 msg
.saddr
= isaddr
.s_addr
;
917 msg
.create
= (itaddr
.s_addr
== myaddr
.s_addr
);
918 lwkt_domsg(rtable_portfn(0), &msg
.netmsg
.nm_lmsg
, 0);
920 arp_update_oncpu(m
, isaddr
.s_addr
, (itaddr
.s_addr
== myaddr
.s_addr
),
921 RTL_REPORTMSG
, TRUE
);
924 if (op
!= ARPOP_REQUEST
) {
928 if (itaddr
.s_addr
== myaddr
.s_addr
) {
929 /* I am the target */
930 memcpy(ar_tha(ah
), ar_sha(ah
), ah
->ar_hln
);
931 memcpy(ar_sha(ah
), enaddr
, ah
->ar_hln
);
933 struct llinfo_arp
*la
;
935 la
= arplookup(itaddr
.s_addr
, FALSE
, RTL_DONTREPORT
, SIN_PROXY
);
937 struct sockaddr_in sin
;
944 bzero(&sin
, sizeof sin
);
945 sin
.sin_family
= AF_INET
;
946 sin
.sin_len
= sizeof sin
;
947 sin
.sin_addr
= itaddr
;
949 rt
= rtpurelookup((struct sockaddr
*)&sin
);
956 * Don't send proxies for nodes on the same interface
957 * as this one came out of, or we'll get into a fight
958 * over who claims what Ether address.
960 if (rt
->rt_ifp
== ifp
) {
964 memcpy(ar_tha(ah
), ar_sha(ah
), ah
->ar_hln
);
965 memcpy(ar_sha(ah
), enaddr
, ah
->ar_hln
);
967 kprintf("arp: proxying for %s\n", inet_ntoa(itaddr
));
970 struct sockaddr_dl
*sdl
;
973 memcpy(ar_tha(ah
), ar_sha(ah
), ah
->ar_hln
);
974 sdl
= SDL(rt
->rt_gateway
);
975 memcpy(ar_sha(ah
), LLADDR(sdl
), ah
->ar_hln
);
979 memcpy(ar_tpa(ah
), ar_spa(ah
), ah
->ar_pln
);
980 memcpy(ar_spa(ah
), &itaddr
, ah
->ar_pln
);
981 ah
->ar_op
= htons(ARPOP_REPLY
);
982 ah
->ar_pro
= htons(ETHERTYPE_IP
); /* let's be sure! */
983 switch (ifp
->if_type
) {
986 * May not be correct for types not explictly
987 * listed, but it is our best guess.
990 eh
= (struct ether_header
*)sa
.sa_data
;
991 memcpy(eh
->ether_dhost
, ar_tha(ah
), sizeof eh
->ether_dhost
);
992 eh
->ether_type
= htons(ETHERTYPE_ARP
);
995 sa
.sa_family
= AF_UNSPEC
;
996 sa
.sa_len
= sizeof sa
;
997 ifp
->if_output(ifp
, m
, &sa
, NULL
);
1003 arp_update_msghandler(struct netmsg
*netmsg
)
1005 struct netmsg_arp_update
*msg
= (struct netmsg_arp_update
*)netmsg
;
1009 * This message handler will be called on all of the CPUs,
1010 * however, we only need to generate rtmsg on CPU0.
1012 arp_update_oncpu(msg
->m
, msg
->saddr
, msg
->create
,
1013 mycpuid
== 0 ? RTL_REPORTMSG
: RTL_DONTREPORT
,
1016 nextcpu
= mycpuid
+ 1;
1017 if (nextcpu
< ncpus
)
1018 lwkt_forwardmsg(rtable_portfn(nextcpu
), &msg
->netmsg
.nm_lmsg
);
1020 lwkt_replymsg(&msg
->netmsg
.nm_lmsg
, 0);
1028 * Free an arp entry. If the arp entry is actively referenced or represents
1029 * a static entry we only clear it back to an unresolved state, otherwise
1030 * we destroy the entry entirely.
1032 * Note that static entries are created when route add ... -interface is used
1033 * to create an interface route to a (direct) destination.
1036 arptfree(struct llinfo_arp
*la
)
1038 struct rtentry
*rt
= la
->la_rt
;
1039 struct sockaddr_dl
*sdl
;
1043 sdl
= SDL(rt
->rt_gateway
);
1045 ((rt
->rt_refcnt
> 0 && sdl
->sdl_family
== AF_LINK
) ||
1046 (rt
->rt_flags
& RTF_STATIC
))) {
1048 la
->la_preempt
= la
->la_asked
= 0;
1049 rt
->rt_flags
&= ~RTF_REJECT
;
1052 rtrequest(RTM_DELETE
, rt_key(rt
), NULL
, rt_mask(rt
), 0, NULL
);
1056 * Lookup or enter a new address in arptab.
1058 static struct llinfo_arp
*
1059 arplookup(in_addr_t addr
, boolean_t create
, boolean_t generate_report
,
1063 struct sockaddr_inarp sin
= { sizeof sin
, AF_INET
};
1064 const char *why
= NULL
;
1066 sin
.sin_addr
.s_addr
= addr
;
1067 sin
.sin_other
= proxy
? SIN_PROXY
: 0;
1069 rt
= _rtlookup((struct sockaddr
*)&sin
,
1070 generate_report
, RTL_DOCLONE
);
1072 rt
= rtpurelookup((struct sockaddr
*)&sin
);
1078 if (rt
->rt_flags
& RTF_GATEWAY
)
1079 why
= "host is not on local network";
1080 else if (!(rt
->rt_flags
& RTF_LLINFO
))
1081 why
= "could not allocate llinfo";
1082 else if (rt
->rt_gateway
->sa_family
!= AF_LINK
)
1083 why
= "gateway route is not ours";
1087 log(LOG_DEBUG
, "arplookup %s failed: %s\n",
1088 inet_ntoa(sin
.sin_addr
), why
);
1090 if (rt
->rt_refcnt
<= 0 && (rt
->rt_flags
& RTF_WASCLONED
)) {
1091 /* No references to this route. Purge it. */
1092 rtrequest(RTM_DELETE
, rt_key(rt
), rt
->rt_gateway
,
1093 rt_mask(rt
), rt
->rt_flags
, NULL
);
1097 return (rt
->rt_llinfo
);
1101 arp_ifinit(struct ifnet
*ifp
, struct ifaddr
*ifa
)
1103 if (IA_SIN(ifa
)->sin_addr
.s_addr
!= INADDR_ANY
) {
1104 arprequest_async(ifp
, &IA_SIN(ifa
)->sin_addr
,
1105 &IA_SIN(ifa
)->sin_addr
, IF_LLADDR(ifp
));
1107 ifa
->ifa_rtrequest
= arp_rtrequest
;
1108 ifa
->ifa_flags
|= RTF_CLONING
;
1112 arp_iainit(struct ifnet
*ifp
, const struct in_addr
*addr
, const u_char
*enaddr
)
1114 if (addr
->s_addr
!= INADDR_ANY
)
1115 arprequest_async(ifp
, addr
, addr
, enaddr
);
1124 for (cpu
= 0; cpu
< ncpus2
; cpu
++)
1125 LIST_INIT(&llinfo_arp_list
[cpu
]);
1128 flags
= NETISR_FLAG_MPSAFE
;
1129 kprintf("arp: MPSAFE\n");
1131 flags
= NETISR_FLAG_NOTMPSAFE
;
1133 netisr_register(NETISR_ARP
, cpu0_portfn
, pktinfo_portfn_cpu0
,
1137 SYSINIT(arp
, SI_SUB_PROTO_DOMAIN
, SI_ORDER_ANY
, arp_init
, 0);