df2be82cec
net/route.h. Remove the hidden include of opt_route.h and net/route.h from net/vnet.h. We need to make sure that both opt_route.h and net/route.h are included before net/vnet.h because of the way MRT figures out the number of FIBs from the kernel option. If we do not, we end up with the default number of 1 when including net/vnet.h and array sizes are wrong. This does not change the list of files which depend on opt_route.h but we can identify them now more easily.
807 lines
22 KiB
C
807 lines
22 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)if_ether.c 8.1 (Berkeley) 6/10/93
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*/
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/*
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* Ethernet address resolution protocol.
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* TODO:
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* add "inuse/lock" bit (or ref. count) along with valid bit
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_route.h"
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#include "opt_mac.h"
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#include "opt_carp.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <sys/vimage.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/netisr.h>
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#include <net/if_llc.h>
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#include <net/ethernet.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <net/if_llatbl.h>
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#include <netinet/if_ether.h>
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#include <netinet/vinet.h>
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#include <net/if_arc.h>
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#include <net/iso88025.h>
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#ifdef DEV_CARP
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#include <netinet/ip_carp.h>
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#endif
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#include <security/mac/mac_framework.h>
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#define SIN(s) ((struct sockaddr_in *)s)
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#define SDL(s) ((struct sockaddr_dl *)s)
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#define LLTABLE(ifp) ((struct lltable *)(ifp)->if_afdata[AF_INET])
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SYSCTL_DECL(_net_link_ether);
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SYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, "");
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/* timer values */
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#ifdef VIMAGE_GLOBALS
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static int arpt_keep; /* once resolved, good for 20 more minutes */
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static int arp_maxtries;
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int useloopback; /* use loopback interface for local traffic */
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static int arp_proxyall;
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#endif
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SYSCTL_V_INT(V_NET, vnet_inet, _net_link_ether_inet, OID_AUTO, max_age,
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CTLFLAG_RW, arpt_keep, 0, "ARP entry lifetime in seconds");
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static struct ifqueue arpintrq;
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SYSCTL_V_INT(V_NET, vnet_inet, _net_link_ether_inet, OID_AUTO, maxtries,
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CTLFLAG_RW, arp_maxtries, 0,
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"ARP resolution attempts before returning error");
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SYSCTL_V_INT(V_NET, vnet_inet, _net_link_ether_inet, OID_AUTO, useloopback,
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CTLFLAG_RW, useloopback, 0,
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"Use the loopback interface for local traffic");
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SYSCTL_V_INT(V_NET, vnet_inet, _net_link_ether_inet, OID_AUTO, proxyall,
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CTLFLAG_RW, arp_proxyall, 0,
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"Enable proxy ARP for all suitable requests");
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static void arp_init(void);
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void arprequest(struct ifnet *,
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struct in_addr *, struct in_addr *, u_char *);
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static void arpintr(struct mbuf *);
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static void arptimer(void *);
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#ifdef INET
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static void in_arpinput(struct mbuf *);
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#endif
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#ifdef AF_INET
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void arp_ifscrub(struct ifnet *ifp, uint32_t addr);
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/*
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* called by in_ifscrub to remove entry from the table when
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* the interface goes away
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*/
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void
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arp_ifscrub(struct ifnet *ifp, uint32_t addr)
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{
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struct sockaddr_in addr4;
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bzero((void *)&addr4, sizeof(addr4));
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addr4.sin_len = sizeof(addr4);
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addr4.sin_family = AF_INET;
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addr4.sin_addr.s_addr = addr;
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IF_AFDATA_LOCK(ifp);
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lla_lookup(LLTABLE(ifp), (LLE_DELETE | LLE_IFADDR),
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(struct sockaddr *)&addr4);
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IF_AFDATA_UNLOCK(ifp);
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}
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#endif
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/*
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* Timeout routine. Age arp_tab entries periodically.
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*/
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static void
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arptimer(void *arg)
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{
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struct ifnet *ifp;
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struct llentry *lle = (struct llentry *)arg;
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if (lle == NULL) {
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panic("%s: NULL entry!\n", __func__);
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return;
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}
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ifp = lle->lle_tbl->llt_ifp;
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IF_AFDATA_LOCK(ifp);
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LLE_WLOCK(lle);
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if (((lle->la_flags & LLE_DELETED)
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|| (time_second >= lle->la_expire))
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&& (!callout_pending(&lle->la_timer) &&
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callout_active(&lle->la_timer)))
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(void) llentry_free(lle);
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else {
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/*
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* Still valid, just drop our reference
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*/
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LLE_FREE_LOCKED(lle);
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}
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IF_AFDATA_UNLOCK(ifp);
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}
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/*
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* Broadcast an ARP request. Caller specifies:
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* - arp header source ip address
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* - arp header target ip address
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* - arp header source ethernet address
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*/
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void
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arprequest(struct ifnet *ifp, struct in_addr *sip, struct in_addr *tip,
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u_char *enaddr)
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{
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struct mbuf *m;
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struct arphdr *ah;
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struct sockaddr sa;
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if (sip == NULL) {
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/* XXX don't believe this can happen (or explain why) */
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/*
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* The caller did not supply a source address, try to find
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* a compatible one among those assigned to this interface.
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*/
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struct ifaddr *ifa;
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TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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if (!ifa->ifa_addr ||
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ifa->ifa_addr->sa_family != AF_INET)
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continue;
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sip = &SIN(ifa->ifa_addr)->sin_addr;
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if (0 == ((sip->s_addr ^ tip->s_addr) &
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SIN(ifa->ifa_netmask)->sin_addr.s_addr) )
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break; /* found it. */
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}
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if (sip == NULL) {
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printf("%s: cannot find matching address\n", __func__);
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return;
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}
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}
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if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL)
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return;
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m->m_len = sizeof(*ah) + 2*sizeof(struct in_addr) +
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2*ifp->if_data.ifi_addrlen;
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m->m_pkthdr.len = m->m_len;
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MH_ALIGN(m, m->m_len);
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ah = mtod(m, struct arphdr *);
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bzero((caddr_t)ah, m->m_len);
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#ifdef MAC
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mac_netinet_arp_send(ifp, m);
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#endif
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ah->ar_pro = htons(ETHERTYPE_IP);
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ah->ar_hln = ifp->if_addrlen; /* hardware address length */
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ah->ar_pln = sizeof(struct in_addr); /* protocol address length */
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ah->ar_op = htons(ARPOP_REQUEST);
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bcopy((caddr_t)enaddr, (caddr_t)ar_sha(ah), ah->ar_hln);
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bcopy((caddr_t)sip, (caddr_t)ar_spa(ah), ah->ar_pln);
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bcopy((caddr_t)tip, (caddr_t)ar_tpa(ah), ah->ar_pln);
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sa.sa_family = AF_ARP;
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sa.sa_len = 2;
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m->m_flags |= M_BCAST;
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(*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0);
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}
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/*
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* Resolve an IP address into an ethernet address.
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* On input:
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* ifp is the interface we use
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* rt0 is the route to the final destination (possibly useless)
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* m is the mbuf. May be NULL if we don't have a packet.
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* dst is the next hop,
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* desten is where we want the address.
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*
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* On success, desten is filled in and the function returns 0;
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* If the packet must be held pending resolution, we return EWOULDBLOCK
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* On other errors, we return the corresponding error code.
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* Note that m_freem() handles NULL.
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*/
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int
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arpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m,
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struct sockaddr *dst, u_char *desten, struct llentry **lle)
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{
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INIT_VNET_INET(ifp->if_vnet);
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struct llentry *la = 0;
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u_int flags = 0;
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int error, renew;
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*lle = NULL;
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if (m != NULL) {
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if (m->m_flags & M_BCAST) {
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/* broadcast */
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(void)memcpy(desten,
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ifp->if_broadcastaddr, ifp->if_addrlen);
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return (0);
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}
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if (m->m_flags & M_MCAST && ifp->if_type != IFT_ARCNET) {
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/* multicast */
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ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten);
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return (0);
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}
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}
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/* XXXXX
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*/
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retry:
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IF_AFDATA_RLOCK(ifp);
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la = lla_lookup(LLTABLE(ifp), flags, dst);
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IF_AFDATA_RUNLOCK(ifp);
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if ((la == NULL) && ((flags & LLE_EXCLUSIVE) == 0)
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&& ((ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0)) {
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flags |= (LLE_CREATE | LLE_EXCLUSIVE);
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IF_AFDATA_WLOCK(ifp);
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la = lla_lookup(LLTABLE(ifp), flags, dst);
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IF_AFDATA_WUNLOCK(ifp);
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}
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if (la == NULL) {
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if (flags & LLE_CREATE)
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log(LOG_DEBUG,
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"arpresolve: can't allocate llinfo for %s\n",
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inet_ntoa(SIN(dst)->sin_addr));
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m_freem(m);
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return (EINVAL);
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}
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if ((la->la_flags & LLE_VALID) &&
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((la->la_flags & LLE_STATIC) || la->la_expire > time_uptime)) {
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bcopy(&la->ll_addr, desten, ifp->if_addrlen);
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/*
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* If entry has an expiry time and it is approaching,
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* see if we need to send an ARP request within this
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* arpt_down interval.
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*/
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if (!(la->la_flags & LLE_STATIC) &&
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time_uptime + la->la_preempt > la->la_expire) {
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arprequest(ifp, NULL,
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&SIN(dst)->sin_addr, IF_LLADDR(ifp));
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la->la_preempt--;
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}
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*lle = la;
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error = 0;
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goto done;
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}
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if (la->la_flags & LLE_STATIC) { /* should not happen! */
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log(LOG_DEBUG, "arpresolve: ouch, empty static llinfo for %s\n",
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inet_ntoa(SIN(dst)->sin_addr));
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m_freem(m);
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error = EINVAL;
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goto done;
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}
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renew = (la->la_asked == 0 || la->la_expire != time_uptime);
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if ((renew || m != NULL) && (flags & LLE_EXCLUSIVE) == 0) {
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flags |= LLE_EXCLUSIVE;
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LLE_RUNLOCK(la);
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goto retry;
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}
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/*
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* There is an arptab entry, but no ethernet address
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* response yet. Replace the held mbuf with this
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* latest one.
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*/
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if (m != NULL) {
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if (la->la_hold != NULL)
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m_freem(la->la_hold);
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la->la_hold = m;
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if (renew == 0 && (flags & LLE_EXCLUSIVE)) {
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flags &= ~LLE_EXCLUSIVE;
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LLE_DOWNGRADE(la);
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}
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}
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/*
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* Return EWOULDBLOCK if we have tried less than arp_maxtries. It
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* will be masked by ether_output(). Return EHOSTDOWN/EHOSTUNREACH
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* if we have already sent arp_maxtries ARP requests. Retransmit the
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* ARP request, but not faster than one request per second.
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*/
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if (la->la_asked < V_arp_maxtries)
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error = EWOULDBLOCK; /* First request. */
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else
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error =
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(rt0->rt_flags & RTF_GATEWAY) ? EHOSTDOWN : EHOSTUNREACH;
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if (renew) {
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LLE_ADDREF(la);
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la->la_expire = time_uptime;
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callout_reset(&la->la_timer, hz, arptimer, la);
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la->la_asked++;
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LLE_WUNLOCK(la);
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arprequest(ifp, NULL, &SIN(dst)->sin_addr,
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IF_LLADDR(ifp));
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return (error);
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}
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done:
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if (flags & LLE_EXCLUSIVE)
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LLE_WUNLOCK(la);
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else
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LLE_RUNLOCK(la);
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return (error);
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}
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/*
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* Common length and type checks are done here,
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* then the protocol-specific routine is called.
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*/
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static void
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arpintr(struct mbuf *m)
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{
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struct arphdr *ar;
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if (m->m_len < sizeof(struct arphdr) &&
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((m = m_pullup(m, sizeof(struct arphdr))) == NULL)) {
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log(LOG_ERR, "arp: runt packet -- m_pullup failed\n");
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return;
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}
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ar = mtod(m, struct arphdr *);
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if (ntohs(ar->ar_hrd) != ARPHRD_ETHER &&
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ntohs(ar->ar_hrd) != ARPHRD_IEEE802 &&
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ntohs(ar->ar_hrd) != ARPHRD_ARCNET &&
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ntohs(ar->ar_hrd) != ARPHRD_IEEE1394) {
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log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n",
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(unsigned char *)&ar->ar_hrd, "");
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m_freem(m);
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return;
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}
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if (m->m_len < arphdr_len(ar)) {
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if ((m = m_pullup(m, arphdr_len(ar))) == NULL) {
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log(LOG_ERR, "arp: runt packet\n");
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m_freem(m);
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return;
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}
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ar = mtod(m, struct arphdr *);
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}
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switch (ntohs(ar->ar_pro)) {
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#ifdef INET
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case ETHERTYPE_IP:
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in_arpinput(m);
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return;
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#endif
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}
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m_freem(m);
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}
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#ifdef INET
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/*
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* ARP for Internet protocols on 10 Mb/s Ethernet.
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* Algorithm is that given in RFC 826.
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* In addition, a sanity check is performed on the sender
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* protocol address, to catch impersonators.
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* We no longer handle negotiations for use of trailer protocol:
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* Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent
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* along with IP replies if we wanted trailers sent to us,
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* and also sent them in response to IP replies.
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* This allowed either end to announce the desire to receive
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* trailer packets.
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* We no longer reply to requests for ETHERTYPE_TRAIL protocol either,
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* but formerly didn't normally send requests.
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*/
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static int log_arp_wrong_iface = 1;
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static int log_arp_movements = 1;
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static int log_arp_permanent_modify = 1;
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SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW,
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&log_arp_wrong_iface, 0,
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"log arp packets arriving on the wrong interface");
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SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW,
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&log_arp_movements, 0,
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"log arp replies from MACs different than the one in the cache");
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SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_permanent_modify, CTLFLAG_RW,
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&log_arp_permanent_modify, 0,
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"log arp replies from MACs different than the one in the permanent arp entry");
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static void
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in_arpinput(struct mbuf *m)
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{
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struct arphdr *ah;
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struct ifnet *ifp = m->m_pkthdr.rcvif;
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struct llentry *la = NULL;
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struct rtentry *rt;
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struct ifaddr *ifa;
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struct in_ifaddr *ia;
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struct sockaddr sa;
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struct in_addr isaddr, itaddr, myaddr;
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u_int8_t *enaddr = NULL;
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int op, flags;
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struct mbuf *m0;
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int req_len;
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int bridged = 0, is_bridge = 0;
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#ifdef DEV_CARP
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int carp_match = 0;
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#endif
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struct sockaddr_in sin;
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sin.sin_len = sizeof(struct sockaddr_in);
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = 0;
|
|
INIT_VNET_INET(ifp->if_vnet);
|
|
|
|
if (ifp->if_bridge)
|
|
bridged = 1;
|
|
if (ifp->if_type == IFT_BRIDGE)
|
|
is_bridge = 1;
|
|
|
|
req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
|
|
if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) {
|
|
log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n");
|
|
return;
|
|
}
|
|
|
|
ah = mtod(m, struct arphdr *);
|
|
op = ntohs(ah->ar_op);
|
|
(void)memcpy(&isaddr, ar_spa(ah), sizeof (isaddr));
|
|
(void)memcpy(&itaddr, ar_tpa(ah), sizeof (itaddr));
|
|
|
|
/*
|
|
* For a bridge, we want to check the address irrespective
|
|
* of the receive interface. (This will change slightly
|
|
* when we have clusters of interfaces).
|
|
* If the interface does not match, but the recieving interface
|
|
* is part of carp, we call carp_iamatch to see if this is a
|
|
* request for the virtual host ip.
|
|
* XXX: This is really ugly!
|
|
*/
|
|
LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) {
|
|
if (((bridged && ia->ia_ifp->if_bridge != NULL) ||
|
|
ia->ia_ifp == ifp) &&
|
|
itaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
|
|
goto match;
|
|
#ifdef DEV_CARP
|
|
if (ifp->if_carp != NULL &&
|
|
carp_iamatch(ifp->if_carp, ia, &isaddr, &enaddr) &&
|
|
itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) {
|
|
carp_match = 1;
|
|
goto match;
|
|
}
|
|
#endif
|
|
}
|
|
LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash)
|
|
if (((bridged && ia->ia_ifp->if_bridge != NULL) ||
|
|
ia->ia_ifp == ifp) &&
|
|
isaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
|
|
goto match;
|
|
|
|
#define BDG_MEMBER_MATCHES_ARP(addr, ifp, ia) \
|
|
(ia->ia_ifp->if_bridge == ifp->if_softc && \
|
|
!bcmp(IF_LLADDR(ia->ia_ifp), IF_LLADDR(ifp), ifp->if_addrlen) && \
|
|
addr == ia->ia_addr.sin_addr.s_addr)
|
|
/*
|
|
* Check the case when bridge shares its MAC address with
|
|
* some of its children, so packets are claimed by bridge
|
|
* itself (bridge_input() does it first), but they are really
|
|
* meant to be destined to the bridge member.
|
|
*/
|
|
if (is_bridge) {
|
|
LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) {
|
|
if (BDG_MEMBER_MATCHES_ARP(itaddr.s_addr, ifp, ia)) {
|
|
ifp = ia->ia_ifp;
|
|
goto match;
|
|
}
|
|
}
|
|
}
|
|
#undef BDG_MEMBER_MATCHES_ARP
|
|
|
|
/*
|
|
* No match, use the first inet address on the receive interface
|
|
* as a dummy address for the rest of the function.
|
|
*/
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
|
|
if (ifa->ifa_addr->sa_family == AF_INET) {
|
|
ia = ifatoia(ifa);
|
|
goto match;
|
|
}
|
|
/*
|
|
* If bridging, fall back to using any inet address.
|
|
*/
|
|
if (!bridged || (ia = TAILQ_FIRST(&V_in_ifaddrhead)) == NULL)
|
|
goto drop;
|
|
match:
|
|
if (!enaddr)
|
|
enaddr = (u_int8_t *)IF_LLADDR(ifp);
|
|
myaddr = ia->ia_addr.sin_addr;
|
|
if (!bcmp(ar_sha(ah), enaddr, ifp->if_addrlen))
|
|
goto drop; /* it's from me, ignore it. */
|
|
if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) {
|
|
log(LOG_ERR,
|
|
"arp: link address is broadcast for IP address %s!\n",
|
|
inet_ntoa(isaddr));
|
|
goto drop;
|
|
}
|
|
/*
|
|
* Warn if another host is using the same IP address, but only if the
|
|
* IP address isn't 0.0.0.0, which is used for DHCP only, in which
|
|
* case we suppress the warning to avoid false positive complaints of
|
|
* potential misconfiguration.
|
|
*/
|
|
if (!bridged && isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) {
|
|
log(LOG_ERR,
|
|
"arp: %*D is using my IP address %s on %s!\n",
|
|
ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
|
|
inet_ntoa(isaddr), ifp->if_xname);
|
|
itaddr = myaddr;
|
|
goto reply;
|
|
}
|
|
if (ifp->if_flags & IFF_STATICARP)
|
|
goto reply;
|
|
|
|
bzero(&sin, sizeof(sin));
|
|
sin.sin_len = sizeof(struct sockaddr_in);
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_addr = isaddr;
|
|
flags = (itaddr.s_addr == myaddr.s_addr) ? LLE_CREATE : 0;
|
|
flags |= LLE_EXCLUSIVE;
|
|
IF_AFDATA_LOCK(ifp);
|
|
la = lla_lookup(LLTABLE(ifp), flags, (struct sockaddr *)&sin);
|
|
IF_AFDATA_UNLOCK(ifp);
|
|
if (la != NULL) {
|
|
/* the following is not an error when doing bridging */
|
|
if (!bridged && la->lle_tbl->llt_ifp != ifp
|
|
#ifdef DEV_CARP
|
|
&& (ifp->if_type != IFT_CARP || !carp_match)
|
|
#endif
|
|
) {
|
|
if (log_arp_wrong_iface)
|
|
log(LOG_ERR, "arp: %s is on %s "
|
|
"but got reply from %*D on %s\n",
|
|
inet_ntoa(isaddr),
|
|
la->lle_tbl->llt_ifp->if_xname,
|
|
ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
|
|
ifp->if_xname);
|
|
goto reply;
|
|
}
|
|
if ((la->la_flags & LLE_VALID) &&
|
|
bcmp(ar_sha(ah), &la->ll_addr, ifp->if_addrlen)) {
|
|
if (la->la_flags & LLE_STATIC) {
|
|
log(LOG_ERR,
|
|
"arp: %*D attempts to modify permanent "
|
|
"entry for %s on %s\n",
|
|
ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
|
|
inet_ntoa(isaddr), ifp->if_xname);
|
|
goto reply;
|
|
}
|
|
if (log_arp_movements) {
|
|
log(LOG_INFO, "arp: %s moved from %*D "
|
|
"to %*D on %s\n",
|
|
inet_ntoa(isaddr),
|
|
ifp->if_addrlen,
|
|
(u_char *)&la->ll_addr, ":",
|
|
ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
|
|
ifp->if_xname);
|
|
}
|
|
}
|
|
|
|
if (ifp->if_addrlen != ah->ar_hln) {
|
|
log(LOG_WARNING,
|
|
"arp from %*D: addr len: new %d, i/f %d (ignored)",
|
|
ifp->if_addrlen, (u_char *) ar_sha(ah), ":",
|
|
ah->ar_hln, ifp->if_addrlen);
|
|
goto reply;
|
|
}
|
|
(void)memcpy(&la->ll_addr, ar_sha(ah), ifp->if_addrlen);
|
|
la->la_flags |= LLE_VALID;
|
|
|
|
if (!(la->la_flags & LLE_STATIC)) {
|
|
la->la_expire = time_uptime + V_arpt_keep;
|
|
callout_reset(&la->la_timer, hz * V_arpt_keep,
|
|
arptimer, la);
|
|
}
|
|
la->la_asked = 0;
|
|
la->la_preempt = V_arp_maxtries;
|
|
if (la->la_hold != NULL) {
|
|
m0 = la->la_hold;
|
|
la->la_hold = 0;
|
|
memcpy(&sa, L3_ADDR(la), sizeof(sa));
|
|
LLE_WUNLOCK(la);
|
|
|
|
(*ifp->if_output)(ifp, m0, &sa, NULL);
|
|
return;
|
|
}
|
|
}
|
|
reply:
|
|
if (op != ARPOP_REQUEST)
|
|
goto drop;
|
|
|
|
if (itaddr.s_addr == myaddr.s_addr) {
|
|
/* Shortcut.. the receiving interface is the target. */
|
|
(void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
|
|
(void)memcpy(ar_sha(ah), enaddr, ah->ar_hln);
|
|
} else {
|
|
struct llentry *lle = NULL;
|
|
|
|
if (!V_arp_proxyall)
|
|
goto drop;
|
|
|
|
sin.sin_addr = itaddr;
|
|
/* XXX MRT use table 0 for arp reply */
|
|
rt = in_rtalloc1((struct sockaddr *)&sin, 0, 0UL, 0);
|
|
if (!rt)
|
|
goto drop;
|
|
|
|
/*
|
|
* Don't send proxies for nodes on the same interface
|
|
* as this one came out of, or we'll get into a fight
|
|
* over who claims what Ether address.
|
|
*/
|
|
if (!rt->rt_ifp || rt->rt_ifp == ifp) {
|
|
RTFREE_LOCKED(rt);
|
|
goto drop;
|
|
}
|
|
IF_AFDATA_LOCK(rt->rt_ifp);
|
|
lle = lla_lookup(LLTABLE(rt->rt_ifp), 0, (struct sockaddr *)&sin);
|
|
IF_AFDATA_UNLOCK(rt->rt_ifp);
|
|
RTFREE_LOCKED(rt);
|
|
|
|
if (lle != NULL) {
|
|
(void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
|
|
(void)memcpy(ar_sha(ah), &lle->ll_addr, ah->ar_hln);
|
|
LLE_RUNLOCK(lle);
|
|
} else
|
|
goto drop;
|
|
|
|
/*
|
|
* Also check that the node which sent the ARP packet
|
|
* is on the the interface we expect it to be on. This
|
|
* avoids ARP chaos if an interface is connected to the
|
|
* wrong network.
|
|
*/
|
|
sin.sin_addr = isaddr;
|
|
|
|
/* XXX MRT use table 0 for arp checks */
|
|
rt = in_rtalloc1((struct sockaddr *)&sin, 0, 0UL, 0);
|
|
if (!rt)
|
|
goto drop;
|
|
if (rt->rt_ifp != ifp) {
|
|
log(LOG_INFO, "arp_proxy: ignoring request"
|
|
" from %s via %s, expecting %s\n",
|
|
inet_ntoa(isaddr), ifp->if_xname,
|
|
rt->rt_ifp->if_xname);
|
|
RTFREE_LOCKED(rt);
|
|
goto drop;
|
|
}
|
|
RTFREE_LOCKED(rt);
|
|
|
|
#ifdef DEBUG_PROXY
|
|
printf("arp: proxying for %s\n",
|
|
inet_ntoa(itaddr));
|
|
#endif
|
|
}
|
|
|
|
if (la != NULL)
|
|
LLE_WUNLOCK(la);
|
|
if (itaddr.s_addr == myaddr.s_addr &&
|
|
IN_LINKLOCAL(ntohl(itaddr.s_addr))) {
|
|
/* RFC 3927 link-local IPv4; always reply by broadcast. */
|
|
#ifdef DEBUG_LINKLOCAL
|
|
printf("arp: sending reply for link-local addr %s\n",
|
|
inet_ntoa(itaddr));
|
|
#endif
|
|
m->m_flags |= M_BCAST;
|
|
m->m_flags &= ~M_MCAST;
|
|
} else {
|
|
/* default behaviour; never reply by broadcast. */
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
|
}
|
|
(void)memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln);
|
|
(void)memcpy(ar_spa(ah), &itaddr, ah->ar_pln);
|
|
ah->ar_op = htons(ARPOP_REPLY);
|
|
ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */
|
|
m->m_len = sizeof(*ah) + (2 * ah->ar_pln) + (2 * ah->ar_hln);
|
|
m->m_pkthdr.len = m->m_len;
|
|
sa.sa_family = AF_ARP;
|
|
sa.sa_len = 2;
|
|
(*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0);
|
|
return;
|
|
|
|
drop:
|
|
if (la != NULL)
|
|
LLE_WUNLOCK(la);
|
|
m_freem(m);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
arp_ifinit(struct ifnet *ifp, struct ifaddr *ifa)
|
|
{
|
|
struct llentry *lle;
|
|
|
|
if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) {
|
|
arprequest(ifp, &IA_SIN(ifa)->sin_addr,
|
|
&IA_SIN(ifa)->sin_addr, IF_LLADDR(ifp));
|
|
/*
|
|
* interface address is considered static entry
|
|
* because the output of the arp utility shows
|
|
* that L2 entry as permanent
|
|
*/
|
|
IF_AFDATA_LOCK(ifp);
|
|
lle = lla_lookup(LLTABLE(ifp), (LLE_CREATE | LLE_IFADDR | LLE_STATIC),
|
|
(struct sockaddr *)IA_SIN(ifa));
|
|
IF_AFDATA_UNLOCK(ifp);
|
|
if (lle == NULL)
|
|
log(LOG_INFO, "arp_ifinit: cannot create arp "
|
|
"entry for interface address\n");
|
|
else
|
|
LLE_RUNLOCK(lle);
|
|
}
|
|
ifa->ifa_rtrequest = NULL;
|
|
}
|
|
|
|
void
|
|
arp_ifinit2(struct ifnet *ifp, struct ifaddr *ifa, u_char *enaddr)
|
|
{
|
|
if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY)
|
|
arprequest(ifp, &IA_SIN(ifa)->sin_addr,
|
|
&IA_SIN(ifa)->sin_addr, enaddr);
|
|
ifa->ifa_rtrequest = NULL;
|
|
}
|
|
|
|
static void
|
|
arp_init(void)
|
|
{
|
|
INIT_VNET_INET(curvnet);
|
|
|
|
V_arpt_keep = (20*60); /* once resolved, good for 20 more minutes */
|
|
V_arp_maxtries = 5;
|
|
V_useloopback = 1; /* use loopback interface for local traffic */
|
|
V_arp_proxyall = 0;
|
|
|
|
arpintrq.ifq_maxlen = 50;
|
|
mtx_init(&arpintrq.ifq_mtx, "arp_inq", NULL, MTX_DEF);
|
|
netisr_register(NETISR_ARP, arpintr, &arpintrq, 0);
|
|
}
|
|
SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0);
|