/
if_ethersubr.c
1160 lines (1048 loc) · 27.9 KB
/
if_ethersubr.c
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/* $OpenBSD: if_ethersubr.c,v 1.105 2006/12/07 18:15:29 reyk Exp $ */
/* $NetBSD: if_ethersubr.c,v 1.19 1996/05/07 02:40:30 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1982, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
*/
/*
%%% portions-copyright-nrl-95
Portions of this software are Copyright 1995-1998 by Randall Atkinson,
Ronald Lee, Daniel McDonald, Bao Phan, and Chris Winters. All Rights
Reserved. All rights under this copyright have been assigned to the US
Naval Research Laboratory (NRL). The NRL Copyright Notice and License
Agreement Version 1.1 (January 17, 1995) applies to these portions of the
software.
You should have received a copy of the license with this software. If you
didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.
*/
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/timeout.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/if_llc.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <netinet/in.h>
#ifdef INET
#include <netinet/in_var.h>
#endif
#include <netinet/if_ether.h>
#include <netinet/ip_ipsp.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include "bridge.h"
#if NBRIDGE > 0
#include <net/if_bridge.h>
#endif
#include "vlan.h"
#if NVLAN > 0
#include <net/if_vlan_var.h>
#endif /* NVLAN > 0 */
#include "carp.h"
#if NCARP > 0
#include <netinet/ip_carp.h>
#endif
#include "pppoe.h"
#if NPPPOE > 0
#include <net/if_pppoe.h>
#endif
#include "trunk.h"
#if NTRUNK > 0
#include <net/if_trunk.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif
#ifdef NETATALK
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#include <netatalk/at_extern.h>
extern u_char at_org_code[ 3 ];
extern u_char aarp_org_code[ 3 ];
#endif /* NETATALK */
u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
#define senderr(e) { error = (e); goto bad;}
int
ether_ioctl(ifp, arp, cmd, data)
struct ifnet *ifp;
struct arpcom *arp;
u_long cmd;
caddr_t data;
{
struct ifaddr *ifa = (struct ifaddr *)data;
int error = 0;
switch (cmd) {
case SIOCSIFADDR:
switch (ifa->ifa_addr->sa_family) {
#ifdef IPX
case AF_IPX:
{
struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr;
if (ipx_nullhost(*ina))
ina->ipx_host =
*(union ipx_host *)(arp->ac_enaddr);
else
bcopy(ina->ipx_host.c_host,
arp->ac_enaddr, sizeof(arp->ac_enaddr));
break;
}
#endif /* IPX */
#ifdef NETATALK
case AF_APPLETALK:
/* Nothing to do. */
break;
#endif /* NETATALK */
}
break;
default:
break;
}
return error;
}
/*
* Ethernet output routine.
* Encapsulate a packet of type family for the local net.
* Assumes that ifp is actually pointer to arpcom structure.
*/
int
ether_output(ifp0, m0, dst, rt0)
struct ifnet *ifp0;
struct mbuf *m0;
struct sockaddr *dst;
struct rtentry *rt0;
{
u_int16_t etype;
int s, len, error = 0, hdrcmplt = 0;
u_char edst[ETHER_ADDR_LEN], esrc[ETHER_ADDR_LEN];
struct mbuf *m = m0;
struct rtentry *rt;
struct mbuf *mcopy = (struct mbuf *)0;
struct ether_header *eh;
struct arpcom *ac = (struct arpcom *)ifp0;
short mflags;
struct ifnet *ifp = ifp0;
#if NTRUNK > 0
if (ifp->if_type == IFT_IEEE8023ADLAG)
senderr(EBUSY);
#endif
#if NCARP > 0
if (ifp->if_type == IFT_CARP) {
struct ifaddr *ifa;
/* loop back if this is going to the carp interface */
if (dst != NULL && LINK_STATE_IS_UP(ifp0->if_link_state) &&
(ifa = ifa_ifwithaddr(dst)) != NULL &&
ifa->ifa_ifp == ifp0)
return (looutput(ifp0, m, dst, rt0));
ifp = ifp->if_carpdev;
ac = (struct arpcom *)ifp;
if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) !=
(IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
}
#endif /* NCARP > 0 */
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
if ((rt = rt0) != NULL) {
if ((rt->rt_flags & RTF_UP) == 0) {
if ((rt0 = rt = rtalloc1(dst, 1, 0)) != NULL)
rt->rt_refcnt--;
else
senderr(EHOSTUNREACH);
}
if (rt->rt_flags & RTF_GATEWAY) {
if (rt->rt_gwroute == 0)
goto lookup;
if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
rtfree(rt); rt = rt0;
lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0);
if ((rt = rt->rt_gwroute) == 0)
senderr(EHOSTUNREACH);
}
}
if (rt->rt_flags & RTF_REJECT)
if (rt->rt_rmx.rmx_expire == 0 ||
time_second < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
if (!arpresolve(ac, rt, m, dst, edst))
return (0); /* if not yet resolved */
/* If broadcasting on a simplex interface, loopback a copy */
if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) {
#if NPF > 0
struct pf_mtag *t;
if ((t = pf_find_mtag(m)) == NULL || !t->routed)
#endif
mcopy = m_copy(m, 0, (int)M_COPYALL);
}
etype = htons(ETHERTYPE_IP);
break;
#endif
#ifdef INET6
case AF_INET6:
if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst))
return (0); /* it must be impossible, but... */
etype = htons(ETHERTYPE_IPV6);
break;
#endif
#ifdef IPX
case AF_IPX:
etype = htons(ETHERTYPE_IPX);
bcopy((caddr_t)&satosipx(dst)->sipx_addr.ipx_host,
(caddr_t)edst, sizeof(edst));
/* If broadcasting on a simplex interface, loopback a copy */
if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
mcopy = m_copy(m, 0, (int)M_COPYALL);
break;
#endif
#ifdef NETATALK
case AF_APPLETALK: {
struct at_ifaddr *aa;
if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) {
#ifdef NETATALKDEBUG
extern char *prsockaddr(struct sockaddr *);
printf("aarpresolv: failed for %s\n", prsockaddr(dst));
#endif /* NETATALKDEBUG */
return (0);
}
/*
* ifaddr is the first thing in at_ifaddr
*/
aa = (struct at_ifaddr *)at_ifawithnet(
(struct sockaddr_at *)dst,
TAILQ_FIRST(&ifp->if_addrlist));
if (aa == 0)
goto bad;
/*
* In the phase 2 case, we need to prepend an mbuf for the llc
* header. Since we must preserve the value of m, which is
* passed to us by value, we m_copy() the first mbuf,
* and use it for our llc header.
*/
if (aa->aa_flags & AFA_PHASE2) {
struct llc llc;
M_PREPEND(m, AT_LLC_SIZE, M_DONTWAIT);
if (m == NULL)
return (0);
/*
* FreeBSD doesn't count the LLC len in
* ifp->obytes, so they increment a length
* field here. We don't do this.
*/
llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
llc.llc_control = LLC_UI;
bcopy(at_org_code, llc.llc_snap.org_code,
sizeof(at_org_code));
llc.llc_snap.ether_type = htons( ETHERTYPE_AT );
bcopy(&llc, mtod(m, caddr_t), AT_LLC_SIZE);
etype = htons(m->m_pkthdr.len);
} else {
etype = htons(ETHERTYPE_AT);
}
} break;
#endif /* NETATALK */
case pseudo_AF_HDRCMPLT:
hdrcmplt = 1;
eh = (struct ether_header *)dst->sa_data;
bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof(esrc));
/* FALLTHROUGH */
case AF_UNSPEC:
eh = (struct ether_header *)dst->sa_data;
bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof(edst));
/* AF_UNSPEC doesn't swap the byte order of the ether_type. */
etype = eh->ether_type;
break;
default:
printf("%s: can't handle af%d\n", ifp->if_xname,
dst->sa_family);
senderr(EAFNOSUPPORT);
}
/* XXX Should we feed-back an unencrypted IPsec packet ? */
if (mcopy)
(void) looutput(ifp, mcopy, dst, rt);
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
eh = mtod(m, struct ether_header *);
bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type,
sizeof(eh->ether_type));
bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof(edst));
if (hdrcmplt)
bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost,
sizeof(eh->ether_shost));
else
bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost,
sizeof(eh->ether_shost));
#if NCARP > 0
if (ifp0 != ifp && ifp0->if_type == IFT_CARP &&
!(ifp0->if_flags & IFF_LINK1)) {
bcopy((caddr_t)((struct arpcom *)ifp0)->ac_enaddr,
(caddr_t)eh->ether_shost, sizeof(eh->ether_shost));
}
#endif
#if NBRIDGE > 0
/*
* Interfaces that are bridge members need special handling
* for output.
*/
if (ifp->if_bridge) {
struct m_tag *mtag;
/*
* Check if this packet has already been sent out through
* this bridge, in which case we simply send it out
* without further bridge processing.
*/
for (mtag = m_tag_find(m, PACKET_TAG_BRIDGE, NULL); mtag;
mtag = m_tag_find(m, PACKET_TAG_BRIDGE, mtag)) {
#ifdef DEBUG
/* Check that the information is there */
if (mtag->m_tag_len != sizeof(caddr_t)) {
error = EINVAL;
goto bad;
}
#endif
if (!bcmp(&ifp->if_bridge, mtag + 1, sizeof(caddr_t)))
break;
}
if (mtag == NULL) {
/* Attach a tag so we can detect loops */
mtag = m_tag_get(PACKET_TAG_BRIDGE, sizeof(caddr_t),
M_NOWAIT);
if (mtag == NULL) {
error = ENOBUFS;
goto bad;
}
bcopy(&ifp->if_bridge, mtag + 1, sizeof(caddr_t));
m_tag_prepend(m, mtag);
bridge_output(ifp, m, NULL, NULL);
return (error);
}
}
#endif
mflags = m->m_flags;
len = m->m_pkthdr.len;
s = splnet();
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
if (error) {
/* mbuf is already freed */
splx(s);
return (error);
}
ifp->if_obytes += len + ETHER_HDR_LEN;
#if NCARP > 0
if (ifp != ifp0)
ifp0->if_obytes += len + ETHER_HDR_LEN;
#endif /* NCARP > 0 */
if (mflags & M_MCAST)
ifp->if_omcasts++;
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
return (error);
bad:
if (m)
m_freem(m);
return (error);
}
/*
* Process a received Ethernet packet;
* the packet is in the mbuf chain m without
* the ether header, which is provided separately.
*/
void
ether_input(ifp, eh, m)
struct ifnet *ifp;
struct ether_header *eh;
struct mbuf *m;
{
struct ifqueue *inq;
u_int16_t etype;
int s, llcfound = 0;
struct llc *l;
struct arpcom *ac;
#if NTRUNK > 0
int i = 0;
#endif
#if NPPPOE > 0
struct ether_header *eh_tmp;
#endif
if (eh == NULL) {
eh = mtod(m, struct ether_header *);
m_adj(m, ETHER_HDR_LEN);
}
#if NTRUNK > 0
/* Handle input from a trunk port */
while (ifp->if_type == IFT_IEEE8023ADLAG) {
if (++i > TRUNK_MAX_STACKING ||
trunk_input(ifp, eh, m) != 0) {
if (m)
m_freem(m);
return;
}
/* Has been set to the trunk interface */
ifp = m->m_pkthdr.rcvif;
}
#endif
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
if ((ifp->if_flags & IFF_SIMPLEX) == 0) {
struct ifaddr *ifa;
struct sockaddr_dl *sdl = NULL;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
if ((sdl =
(struct sockaddr_dl *)ifa->ifa_addr) &&
sdl->sdl_family == AF_LINK)
break;
}
/*
* If this is not a simplex interface, drop the packet
* if it came from us.
*/
if (sdl && bcmp(LLADDR(sdl), eh->ether_shost,
ETHER_ADDR_LEN) == 0) {
m_freem(m);
return;
}
}
if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
sizeof(etherbroadcastaddr)) == 0)
m->m_flags |= M_BCAST;
else
m->m_flags |= M_MCAST;
ifp->if_imcasts++;
}
ifp->if_ibytes += m->m_pkthdr.len + sizeof(*eh);
etype = ntohs(eh->ether_type);
#if NVLAN > 0
if (etype == ETHERTYPE_VLAN && (vlan_input(eh, m) == 0))
return;
#endif
#if NBRIDGE > 0
/*
* Tap the packet off here for a bridge, if configured and
* active for this interface. bridge_input returns
* NULL if it has consumed the packet, otherwise, it
* gets processed as normal.
*/
if (ifp->if_bridge) {
if (m->m_flags & M_PROTO1)
m->m_flags &= ~M_PROTO1;
else {
m = bridge_input(ifp, eh, m);
if (m == NULL)
return;
/* The bridge has determined it's for us. */
ifp = m->m_pkthdr.rcvif;
}
}
#endif
#if NVLAN > 0
if (etype == ETHERTYPE_VLAN) {
/* The bridge did not want the vlan frame either, drop it. */
ifp->if_noproto++;
m_freem(m);
return;
}
#endif /* NVLAN > 0 */
#if NCARP > 0
if (ifp->if_carp) {
if (ifp->if_type != IFT_CARP &&
(carp_input(m, (u_int8_t *)&eh->ether_shost,
(u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0))
return;
/* Always clear multicast flags if received on a carp address */
else if (ifp->if_type == IFT_CARP &&
ifp->if_flags & IFF_LINK2 &&
m->m_flags & (M_BCAST|M_MCAST) &&
!bcmp(((struct arpcom *)ifp)->ac_enaddr,
(caddr_t)eh->ether_dhost, ETHER_ADDR_LEN))
m->m_flags &= ~(M_BCAST|M_MCAST);
}
#endif /* NCARP > 0 */
ac = (struct arpcom *)ifp;
/*
* If packet has been filtered by the bpf listener, drop it now
*/
if (m->m_flags & M_FILDROP) {
m_free(m);
return;
}
/*
* If packet is unicast and we're in promiscuous mode, make sure it
* is for us. Drop otherwise.
*/
if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 &&
(ifp->if_flags & IFF_PROMISC)) {
if (bcmp(ac->ac_enaddr, (caddr_t)eh->ether_dhost,
ETHER_ADDR_LEN)) {
m_freem(m);
return;
}
}
decapsulate:
switch (etype) {
#ifdef INET
case ETHERTYPE_IP:
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
case ETHERTYPE_ARP:
if (ifp->if_flags & IFF_NOARP)
goto dropanyway;
schednetisr(NETISR_ARP);
inq = &arpintrq;
break;
case ETHERTYPE_REVARP:
if (ifp->if_flags & IFF_NOARP)
goto dropanyway;
revarpinput(m); /* XXX queue? */
return;
#endif
#ifdef INET6
/*
* Schedule IPv6 software interrupt for incoming IPv6 packet.
*/
case ETHERTYPE_IPV6:
schednetisr(NETISR_IPV6);
inq = &ip6intrq;
break;
#endif /* INET6 */
#ifdef IPX
case ETHERTYPE_IPX:
schednetisr(NETISR_IPX);
inq = &ipxintrq;
break;
#endif
#ifdef NETATALK
case ETHERTYPE_AT:
schednetisr(NETISR_ATALK);
inq = &atintrq1;
break;
case ETHERTYPE_AARP:
/* probably this should be done with a NETISR as well */
/* XXX queue this */
aarpinput((struct arpcom *)ifp, m);
return;
#endif
#if NPPPOE > 0
case ETHERTYPE_PPPOEDISC:
case ETHERTYPE_PPPOE:
/* XXX we dont have this flag */
/*
if (m->m_flags & M_PROMISC) {
m_freem(m);
return;
}
*/
#ifndef PPPOE_SERVER
if (m->m_flags & (M_MCAST | M_BCAST)) {
m_freem(m);
return;
}
#endif
M_PREPEND(m, sizeof(*eh), M_DONTWAIT);
if (m == NULL)
return;
eh_tmp = mtod(m, struct ether_header *);
bcopy(eh, eh_tmp, sizeof(struct ether_header));
if (etype == ETHERTYPE_PPPOEDISC)
inq = &ppoediscinq;
else
inq = &ppoeinq;
schednetisr(NETISR_PPPOE);
break;
#endif /* NPPPOE > 0 */
default:
if (llcfound || etype > ETHERMTU)
goto dropanyway;
llcfound = 1;
l = mtod(m, struct llc *);
switch (l->llc_dsap) {
case LLC_SNAP_LSAP:
#ifdef NETATALK
/*
* Some protocols (like Appletalk) need special
* handling depending on if they are type II
* or SNAP encapsulated. Everything else
* gets handled by stripping off the SNAP header
* and going back up to decapsulate.
*/
if (l->llc_control == LLC_UI &&
l->llc_ssap == LLC_SNAP_LSAP &&
Bcmp(&(l->llc_snap.org_code)[0],
at_org_code, sizeof(at_org_code)) == 0 &&
ntohs(l->llc_snap.ether_type) == ETHERTYPE_AT) {
inq = &atintrq2;
m_adj(m, AT_LLC_SIZE);
schednetisr(NETISR_ATALK);
break;
}
if (l->llc_control == LLC_UI &&
l->llc_ssap == LLC_SNAP_LSAP &&
Bcmp(&(l->llc_snap.org_code)[0],
aarp_org_code, sizeof(aarp_org_code)) == 0 &&
ntohs(l->llc_snap.ether_type) == ETHERTYPE_AARP) {
m_adj(m, AT_LLC_SIZE);
/* XXX Really this should use netisr too */
aarpinput((struct arpcom *)ifp, m);
return;
}
#endif /* NETATALK */
if (l->llc_control == LLC_UI &&
l->llc_dsap == LLC_SNAP_LSAP &&
l->llc_ssap == LLC_SNAP_LSAP) {
/* SNAP */
if (m->m_pkthdr.len > etype)
m_adj(m, etype - m->m_pkthdr.len);
m->m_data += 6; /* XXX */
m->m_len -= 6; /* XXX */
m->m_pkthdr.len -= 6; /* XXX */
M_PREPEND(m, sizeof(*eh), M_DONTWAIT);
if (m == 0)
return;
*mtod(m, struct ether_header *) = *eh;
goto decapsulate;
}
goto dropanyway;
dropanyway:
default:
m_freem(m);
return;
}
}
s = splnet();
IF_INPUT_ENQUEUE(inq, m);
splx(s);
}
/*
* Convert Ethernet address to printable (loggable) representation.
*/
static char digits[] = "0123456789abcdef";
char *
ether_sprintf(ap)
u_char *ap;
{
int i;
static char etherbuf[ETHER_ADDR_LEN * 3];
char *cp = etherbuf;
for (i = 0; i < ETHER_ADDR_LEN; i++) {
*cp++ = digits[*ap >> 4];
*cp++ = digits[*ap++ & 0xf];
*cp++ = ':';
}
*--cp = 0;
return (etherbuf);
}
/*
* Perform common duties while attaching to interface list
*/
void
ether_ifattach(ifp)
struct ifnet *ifp;
{
/*
* Any interface which provides a MAC address which is obviously
* invalid gets whacked, so that users will notice.
*/
if (ETHER_IS_MULTICAST(((struct arpcom *)ifp)->ac_enaddr)) {
((struct arpcom *)ifp)->ac_enaddr[0] = 0x00;
((struct arpcom *)ifp)->ac_enaddr[1] = 0xfe;
((struct arpcom *)ifp)->ac_enaddr[2] = 0xe1;
((struct arpcom *)ifp)->ac_enaddr[3] = 0xba;
((struct arpcom *)ifp)->ac_enaddr[4] = 0xd0;
/*
* XXX use of random() by anything except the scheduler is
* normally invalid, but this is boot time, so pre-scheduler,
* and the random subsystem is not alive yet
*/
((struct arpcom *)ifp)->ac_enaddr[5] = (u_char)random() & 0xff;
}
ifp->if_type = IFT_ETHER;
ifp->if_addrlen = ETHER_ADDR_LEN;
ifp->if_hdrlen = ETHER_HDR_LEN;
ifp->if_mtu = ETHERMTU;
ifp->if_output = ether_output;
if (ifp->if_hardmtu == 0)
ifp->if_hardmtu = ETHERMTU;
if_alloc_sadl(ifp);
bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr,
LLADDR(ifp->if_sadl), ifp->if_addrlen);
LIST_INIT(&((struct arpcom *)ifp)->ac_multiaddrs);
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, ETHER_HDR_LEN);
#endif
}
void
ether_ifdetach(ifp)
struct ifnet *ifp;
{
struct arpcom *ac = (struct arpcom *)ifp;
struct ether_multi *enm;
for (enm = LIST_FIRST(&ac->ac_multiaddrs);
enm != LIST_END(&ac->ac_multiaddrs);
enm = LIST_FIRST(&ac->ac_multiaddrs)) {
LIST_REMOVE(enm, enm_list);
free(enm, M_IFMADDR);
}
#if 0
/* moved to if_detach() */
if_free_sadl(ifp);
#endif
}
#if 0
/*
* This is for reference. We have table-driven versions of the
* crc32 generators, which are faster than the double-loop.
*/
u_int32_t
ether_crc32_le(const u_int8_t *buf, size_t len)
{
u_int32_t c, crc, carry;
size_t i, j;
crc = 0xffffffffU; /* initial value */
for (i = 0; i < len; i++) {
c = buf[i];
for (j = 0; j < 8; j++) {
carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
crc >>= 1;
c >>= 1;
if (carry)
crc = (crc ^ ETHER_CRC_POLY_LE);
}
}
return (crc);
}
u_int32_t
ether_crc32_be(const u_int8_t *buf, size_t len)
{
u_int32_t c, crc, carry;
size_t i, j;
crc = 0xffffffffU; /* initial value */
for (i = 0; i < len; i++) {
c = buf[i];
for (j = 0; j < 8; j++) {
carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
crc <<= 1;
c >>= 1;
if (carry)
crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
}
}
return (crc);
}
#else
u_int32_t
ether_crc32_le(const u_int8_t *buf, size_t len)
{
static const u_int32_t crctab[] = {
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
};
size_t i;
u_int32_t crc;
crc = 0xffffffffU; /* initial value */
for (i = 0; i < len; i++) {
crc ^= buf[i];
crc = (crc >> 4) ^ crctab[crc & 0xf];
crc = (crc >> 4) ^ crctab[crc & 0xf];
}
return (crc);
}
u_int32_t
ether_crc32_be(const u_int8_t *buf, size_t len)
{
static const u_int8_t rev[] = {
0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf
};
static const u_int32_t crctab[] = {
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd
};
size_t i;
u_int32_t crc;
u_int8_t data;
crc = 0xffffffffU; /* initial value */
for (i = 0; i < len; i++) {
data = buf[i];
crc = (crc << 4) ^ crctab[(crc >> 28) ^ rev[data & 0xf]];
crc = (crc << 4) ^ crctab[(crc >> 28) ^ rev[data >> 4]];
}
return (crc);
}
#endif
#ifdef INET
u_char ether_ipmulticast_min[ETHER_ADDR_LEN] =
{ 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
u_char ether_ipmulticast_max[ETHER_ADDR_LEN] =
{ 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
#endif
#ifdef INET6
u_char ether_ip6multicast_min[ETHER_ADDR_LEN] =
{ 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
u_char ether_ip6multicast_max[ETHER_ADDR_LEN] =
{ 0x33, 0x33, 0xff, 0xff, 0xff, 0xff };
#endif
/*
* Convert a sockaddr into an Ethernet address or range of Ethernet
* addresses.
*/
int
ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN],
u_int8_t addrhi[ETHER_ADDR_LEN])
{
#ifdef INET
struct sockaddr_in *sin;
#endif /* INET */
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif /* INET6 */
switch (sa->sa_family) {
case AF_UNSPEC:
bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN);
bcopy(addrlo, addrhi, ETHER_ADDR_LEN);