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freebsd-nq/sys/net/if_ethersubr.c
Julian Elischer 8e3bda0682 Submitted by: archie@whistle.com 
gary went a little overboard on commenting out unused variables.
Variables needed for ISO, LLC and NETATALK
were only enabled for ISO &  LLC.. so NETATALK bombed.
1996-06-19 01:50:10 +00:00

788 lines
20 KiB
C
Raw Blame History

/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
* $Id: if_ethersubr.c,v 1.20 1996/06/13 02:54:03 davidg Exp $
*/
#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/sysctl.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_types.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#endif
#include <netinet/if_ether.h>
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#ifdef ISO
#include <netiso/argo_debug.h>
#include <netiso/iso.h>
#include <netiso/iso_var.h>
#include <netiso/iso_snpac.h>
#endif
/*#ifdef LLC
#include <netccitt/dll.h>
#include <netccitt/llc_var.h>
#endif*/
#if defined(LLC) && defined(CCITT)
extern struct ifqueue pkintrq;
#endif
#ifdef NETATALK
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#include <netatalk/at_extern.h>
#define llc_snap_org_code llc_un.type_snap.org_code
#define llc_snap_ether_type llc_un.type_snap.ether_type
extern u_char at_org_code[ 3 ];
extern u_char aarp_org_code[ 3 ];
#endif NETATALK
u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
#define senderr(e) { error = (e); goto bad;}
/*
* Ethernet output routine.
* Encapsulate a packet of type family for the local net.
* Use trailer local net encapsulation if enough data in first
* packet leaves a multiple of 512 bytes of data in remainder.
* Assumes that ifp is actually pointer to arpcom structure.
*/
int
ether_output(ifp, m0, dst, rt0)
register struct ifnet *ifp;
struct mbuf *m0;
struct sockaddr *dst;
struct rtentry *rt0;
{
short type;
int s, error = 0;
u_char edst[6];
register struct mbuf *m = m0;
register struct rtentry *rt;
struct mbuf *mcopy = (struct mbuf *)0;
register struct ether_header *eh;
int off, len = m->m_pkthdr.len;
struct arpcom *ac = (struct arpcom *)ifp;
#ifdef NETATALK
struct at_ifaddr *aa;
#endif NETATALK
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
rt = rt0;
if (rt) {
if ((rt->rt_flags & RTF_UP) == 0) {
rt0 = rt = rtalloc1(dst, 1, 0UL);
if (rt0)
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,
0UL);
if ((rt = rt->rt_gwroute) == 0)
senderr(EHOSTUNREACH);
}
}
if (rt->rt_flags & RTF_REJECT)
if (rt->rt_rmx.rmx_expire == 0 ||
time.tv_sec < 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, rt0))
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))
mcopy = m_copy(m, 0, (int)M_COPYALL);
off = m->m_pkthdr.len - m->m_len;
type = htons(ETHERTYPE_IP);
break;
#endif
#ifdef IPX
case AF_IPX:
type = htons(ETHERTYPE_IPX);
bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
(caddr_t)edst, sizeof (edst));
if (!bcmp((caddr_t)edst, (caddr_t)&ipx_thishost, sizeof(edst)))
return (looutput(ifp, m, dst, rt));
/* 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:
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
*/
if ((aa = (struct at_ifaddr *)at_ifawithnet(
(struct sockaddr_at *)dst, ifp->if_addrlist))
== 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, sizeof(struct llc), M_WAIT);
len += sizeof(struct llc);
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), sizeof(struct llc));
type = htons(m->m_pkthdr.len);
} else {
type = htons(ETHERTYPE_AT);
}
break;
#endif NETATALK
#ifdef NS
case AF_NS:
type = htons(ETHERTYPE_NS);
bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),
(caddr_t)edst, sizeof (edst));
if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst)))
return (looutput(ifp, m, dst, rt));
/* 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 ISO
case AF_ISO: {
int snpalen;
struct llc *l;
register struct sockaddr_dl *sdl;
if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) &&
sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) {
bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst));
} else if (error =
iso_snparesolve(ifp, (struct sockaddr_iso *)dst,
(char *)edst, &snpalen))
goto bad; /* Not Resolved */
/* If broadcasting on a simplex interface, loopback a copy */
if (*edst & 1)
m->m_flags |= (M_BCAST|M_MCAST);
if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) &&
(mcopy = m_copy(m, 0, (int)M_COPYALL))) {
M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);
if (mcopy) {
eh = mtod(mcopy, struct ether_header *);
bcopy((caddr_t)edst,
(caddr_t)eh->ether_dhost, sizeof (edst));
bcopy((caddr_t)ac->ac_enaddr,
(caddr_t)eh->ether_shost, sizeof (edst));
}
}
M_PREPEND(m, 3, M_DONTWAIT);
if (m == NULL)
return (0);
type = htons(m->m_pkthdr.len);
l = mtod(m, struct llc *);
l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;
l->llc_control = LLC_UI;
len += 3;
IFDEBUG(D_ETHER)
int i;
printf("unoutput: sending pkt to: ");
for (i=0; i<6; i++)
printf("%x ", edst[i] & 0xff);
printf("\n");
ENDDEBUG
} break;
#endif /* ISO */
#ifdef LLC
/* case AF_NSAP: */
case AF_CCITT: {
register struct sockaddr_dl *sdl =
(struct sockaddr_dl *) rt -> rt_gateway;
if (sdl && sdl->sdl_family == AF_LINK
&& sdl->sdl_alen > 0) {
bcopy(LLADDR(sdl), (char *)edst,
sizeof(edst));
} else goto bad; /* Not a link interface ? Funny ... */
if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) &&
(mcopy = m_copy(m, 0, (int)M_COPYALL))) {
M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);
if (mcopy) {
eh = mtod(mcopy, struct ether_header *);
bcopy((caddr_t)edst,
(caddr_t)eh->ether_dhost, sizeof (edst));
bcopy((caddr_t)ac->ac_enaddr,
(caddr_t)eh->ether_shost, sizeof (edst));
}
}
type = htons(m->m_pkthdr.len);
#ifdef LLC_DEBUG
{
int i;
register struct llc *l = mtod(m, struct llc *);
printf("ether_output: sending LLC2 pkt to: ");
for (i=0; i<6; i++)
printf("%x ", edst[i] & 0xff);
printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n",
type & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff,
l->llc_control & 0xff);
}
#endif /* LLC_DEBUG */
} break;
#endif /* LLC */
case AF_UNSPEC:
eh = (struct ether_header *)dst->sa_data;
(void)memcpy(edst, eh->ether_dhost, sizeof (edst));
type = eh->ether_type;
break;
default:
printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
dst->sa_family);
senderr(EAFNOSUPPORT);
}
if (mcopy)
(void) looutput(ifp, mcopy, dst, rt);
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
eh = mtod(m, struct ether_header *);
(void)memcpy(&eh->ether_type, &type,
sizeof(eh->ether_type));
(void)memcpy(eh->ether_dhost, edst, sizeof (edst));
(void)memcpy(eh->ether_shost, ac->ac_enaddr,
sizeof(eh->ether_shost));
s = splimp();
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
if (IF_QFULL(&ifp->if_snd)) {
IF_DROP(&ifp->if_snd);
splx(s);
senderr(ENOBUFS);
}
IF_ENQUEUE(&ifp->if_snd, m);
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
ifp->if_obytes += len + sizeof (struct ether_header);
if (m->m_flags & M_MCAST)
ifp->if_omcasts++;
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;
register struct ether_header *eh;
struct mbuf *m;
{
register struct ifqueue *inq;
u_short ether_type;
int s;
#if defined (ISO) || defined (LLC) || defined(NETATALK)
register struct llc *l;
#endif
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
sizeof(etherbroadcastaddr)) == 0)
m->m_flags |= M_BCAST;
else if (eh->ether_dhost[0] & 1)
m->m_flags |= M_MCAST;
if (m->m_flags & (M_BCAST|M_MCAST))
ifp->if_imcasts++;
ether_type = ntohs(eh->ether_type);
switch (ether_type) {
#ifdef INET
case ETHERTYPE_IP:
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
case ETHERTYPE_ARP:
schednetisr(NETISR_ARP);
inq = &arpintrq;
break;
#endif
#ifdef IPX
case ETHERTYPE_IPX:
schednetisr(NETISR_IPX);
inq = &ipxintrq;
break;
#endif
#ifdef NS
case ETHERTYPE_NS:
schednetisr(NETISR_NS);
inq = &nsintrq;
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 */
aarpinput((struct arpcom *)ifp, m); /* XXX */
return;
#endif NETATALK
default:
#if defined (ISO) || defined (LLC) || defined(NETATALK)
if (ether_type > ETHERMTU)
goto dropanyway;
l = mtod(m, struct llc *);
switch (l->llc_dsap) {
#ifdef NETATALK
case LLC_SNAP_LSAP:
switch (l->llc_control) {
case LLC_UI:
if (l->llc_ssap != LLC_SNAP_LSAP)
goto dropanyway;
if (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, sizeof( struct llc ));
schednetisr(NETISR_ATALK);
break;
}
if (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, sizeof( struct llc ));
aarpinput((struct arpcom *)ifp, m); /* XXX */
return;
}
default:
goto dropanyway;
}
break;
#endif NETATALK
#ifdef ISO
case LLC_ISO_LSAP:
switch (l->llc_control) {
case LLC_UI:
/* LLC_UI_P forbidden in class 1 service */
if ((l->llc_dsap == LLC_ISO_LSAP) &&
(l->llc_ssap == LLC_ISO_LSAP)) {
/* LSAP for ISO */
if (m->m_pkthdr.len > ether_type)
m_adj(m, ether_type - m->m_pkthdr.len);
m->m_data += 3; /* XXX */
m->m_len -= 3; /* XXX */
m->m_pkthdr.len -= 3; /* XXX */
M_PREPEND(m, sizeof *eh, M_DONTWAIT);
if (m == 0)
return;
*mtod(m, struct ether_header *) = *eh;
IFDEBUG(D_ETHER)
printf("clnp packet");
ENDDEBUG
schednetisr(NETISR_ISO);
inq = &clnlintrq;
break;
}
goto dropanyway;
case LLC_XID:
case LLC_XID_P:
if(m->m_len < 6)
goto dropanyway;
l->llc_window = 0;
l->llc_fid = 9;
l->llc_class = 1;
l->llc_dsap = l->llc_ssap = 0;
/* Fall through to */
case LLC_TEST:
case LLC_TEST_P:
{
struct sockaddr sa;
register struct ether_header *eh2;
int i;
u_char c = l->llc_dsap;
l->llc_dsap = l->llc_ssap;
l->llc_ssap = c;
if (m->m_flags & (M_BCAST | M_MCAST))
bcopy((caddr_t)ac->ac_enaddr,
(caddr_t)eh->ether_dhost, 6);
sa.sa_family = AF_UNSPEC;
sa.sa_len = sizeof(sa);
eh2 = (struct ether_header *)sa.sa_data;
for (i = 0; i < 6; i++) {
eh2->ether_shost[i] = c = eh->ether_dhost[i];
eh2->ether_dhost[i] =
eh->ether_dhost[i] = eh->ether_shost[i];
eh->ether_shost[i] = c;
}
ifp->if_output(ifp, m, &sa, NULL);
return;
}
default:
m_freem(m);
return;
}
break;
#endif /* ISO */
#ifdef LLC
case LLC_X25_LSAP:
{
if (m->m_pkthdr.len > ether_type)
m_adj(m, ether_type - m->m_pkthdr.len);
M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT);
if (m == 0)
return;
if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP,
eh->ether_dhost, LLC_X25_LSAP, 6,
mtod(m, struct sdl_hdr *)))
panic("ETHER cons addr failure");
mtod(m, struct sdl_hdr *)->sdlhdr_len = ether_type;
#ifdef LLC_DEBUG
printf("llc packet\n");
#endif /* LLC_DEBUG */
schednetisr(NETISR_CCITT);
inq = &llcintrq;
break;
}
#endif /* LLC */
dropanyway:
default:
m_freem(m);
return;
}
#else /* ISO || LLC || NETATALK */
m_freem(m);
return;
#endif /* ISO || LLC || NETATALK */
}
s = splimp();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
}
/*
* Perform common duties while attaching to interface list
*/
void
ether_ifattach(ifp)
register struct ifnet *ifp;
{
register struct ifaddr *ifa;
register struct sockaddr_dl *sdl;
ifp->if_type = IFT_ETHER;
ifp->if_addrlen = 6;
ifp->if_hdrlen = 14;
ifp->if_mtu = ETHERMTU;
if (ifp->if_baudrate == 0)
ifp->if_baudrate = 10000000;
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
sdl->sdl_family == AF_LINK) {
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ifp->if_addrlen;
bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr,
LLADDR(sdl), ifp->if_addrlen);
break;
}
}
static u_char ether_ipmulticast_min[6] =
{ 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
static u_char ether_ipmulticast_max[6] =
{ 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
/*
* Add an Ethernet multicast address or range of addresses to the list for a
* given interface.
*/
int
ether_addmulti(ifr, ac)
struct ifreq *ifr;
register struct arpcom *ac;
{
register struct ether_multi *enm;
struct sockaddr_in *sin;
u_char addrlo[6];
u_char addrhi[6];
int set_allmulti = 0;
int s = splimp();
switch (ifr->ifr_addr.sa_family) {
case AF_UNSPEC:
bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
bcopy(addrlo, addrhi, 6);
break;
#ifdef INET
case AF_INET:
sin = (struct sockaddr_in *)&(ifr->ifr_addr);
if (sin->sin_addr.s_addr == INADDR_ANY) {
/*
* An IP address of INADDR_ANY means listen to all
* of the Ethernet multicast addresses used for IP.
* (This is for the sake of IP multicast routers.)
*/
bcopy(ether_ipmulticast_min, addrlo, 6);
bcopy(ether_ipmulticast_max, addrhi, 6);
set_allmulti = 1;
}
else {
ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
bcopy(addrlo, addrhi, 6);
}
break;
#endif
default:
splx(s);
return (EAFNOSUPPORT);
}
/*
* Verify that we have valid Ethernet multicast addresses.
*/
if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) {
splx(s);
return (EINVAL);
}
/*
* See if the address range is already in the list.
*/
ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
if (enm != NULL) {
/*
* Found it; just increment the reference count.
*/
++enm->enm_refcount;
splx(s);
return (0);
}
/*
* New address or range; malloc a new multicast record
* and link it into the interface's multicast list.
*/
enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
if (enm == NULL) {
splx(s);
return (ENOBUFS);
}
bcopy(addrlo, enm->enm_addrlo, 6);
bcopy(addrhi, enm->enm_addrhi, 6);
enm->enm_ac = ac;
enm->enm_refcount = 1;
enm->enm_next = ac->ac_multiaddrs;
ac->ac_multiaddrs = enm;
ac->ac_multicnt++;
splx(s);
if (set_allmulti)
ac->ac_if.if_flags |= IFF_ALLMULTI;
/*
* Return ENETRESET to inform the driver that the list has changed
* and its reception filter should be adjusted accordingly.
*/
return (ENETRESET);
}
/*
* Delete a multicast address record.
*/
int
ether_delmulti(ifr, ac)
struct ifreq *ifr;
register struct arpcom *ac;
{
register struct ether_multi *enm;
register struct ether_multi **p;
struct sockaddr_in *sin;
u_char addrlo[6];
u_char addrhi[6];
int unset_allmulti = 0;
int s = splimp();
switch (ifr->ifr_addr.sa_family) {
case AF_UNSPEC:
bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
bcopy(addrlo, addrhi, 6);
break;
#ifdef INET
case AF_INET:
sin = (struct sockaddr_in *)&(ifr->ifr_addr);
if (sin->sin_addr.s_addr == INADDR_ANY) {
/*
* An IP address of INADDR_ANY means stop listening
* to the range of Ethernet multicast addresses used
* for IP.
*/
bcopy(ether_ipmulticast_min, addrlo, 6);
bcopy(ether_ipmulticast_max, addrhi, 6);
unset_allmulti = 1;
}
else {
ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
bcopy(addrlo, addrhi, 6);
}
break;
#endif
default:
splx(s);
return (EAFNOSUPPORT);
}
/*
* Look up the address in our list.
*/
ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
if (enm == NULL) {
splx(s);
return (ENXIO);
}
if (--enm->enm_refcount != 0) {
/*
* Still some claims to this record.
*/
splx(s);
return (0);
}
/*
* No remaining claims to this record; unlink and free it.
*/
for (p = &enm->enm_ac->ac_multiaddrs;
*p != enm;
p = &(*p)->enm_next)
continue;
*p = (*p)->enm_next;
free(enm, M_IFMADDR);
ac->ac_multicnt--;
splx(s);
if (unset_allmulti)
ac->ac_if.if_flags &= ~IFF_ALLMULTI;
/*
* Return ENETRESET to inform the driver that the list has changed
* and its reception filter should be adjusted accordingly.
*/
return (ENETRESET);
}
SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
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