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if_ethersubr.c
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if_ethersubr.c
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/* $NetBSD: if_ethersubr.c,v 1.169.6.1 2009/11/21 19:56:35 snj 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 8.2 (Berkeley) 4/4/96
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.169.6.1 2009/11/21 19:56:35 snj Exp $");
#include "opt_inet.h"
#include "opt_atalk.h"
#include "opt_iso.h"
#include "opt_ipx.h"
#include "opt_mbuftrace.h"
#include "opt_gateway.h"
#include "opt_pfil_hooks.h"
#include "opt_pppoe.h"
#include "vlan.h"
#include "pppoe.h"
#include "bridge.h"
#include "bpfilter.h"
#include "arp.h"
#include "agr.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/callout.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/kauth.h>
#include <sys/cpu.h>
#include <sys/intr.h>
#include <sys/device.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>
#include <net/if_media.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#if NARP == 0
/*
* XXX there should really be a way to issue this warning from within config(8)
*/
#error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK.
#endif
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <net/if_ether.h>
#if NVLAN > 0
#include <net/if_vlanvar.h>
#endif
#if NPPPOE > 0
#include <net/if_pppoe.h>
#endif
#if NAGR > 0
#include <net/agr/ieee8023_slowprotocols.h> /* XXX */
#include <net/agr/ieee8023ad.h>
#include <net/agr/if_agrvar.h>
#endif
#if NBRIDGE > 0
#include <net/if_bridgevar.h>
#endif
#include <netinet/in.h>
#ifdef INET
#include <netinet/in_var.h>
#endif
#include <netinet/if_inarp.h>
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#endif
#include "carp.h"
#if NCARP > 0
#include <netinet/ip_carp.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_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 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 */
static struct timeval bigpktppslim_last;
static int bigpktppslim = 2; /* XXX */
static int bigpktpps_count;
const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] =
{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 };
#define senderr(e) { error = (e); goto bad;}
static int ether_output(struct ifnet *, struct mbuf *,
const struct sockaddr *, struct rtentry *);
/*
* Ethernet output routine.
* Encapsulate a packet of type family for the local net.
* Assumes that ifp is actually pointer to ethercom structure.
*/
static int
ether_output(struct ifnet *ifp0, struct mbuf *m0, const struct sockaddr *dst,
struct rtentry *rt0)
{
uint16_t etype = 0;
int error = 0, hdrcmplt = 0;
uint8_t esrc[6], edst[6];
struct mbuf *m = m0;
struct rtentry *rt;
struct mbuf *mcopy = NULL;
struct ether_header *eh;
struct ifnet *ifp = ifp0;
ALTQ_DECL(struct altq_pktattr pktattr;)
#ifdef INET
struct arphdr *ah;
#endif /* INET */
#ifdef NETATALK
struct at_ifaddr *aa;
#endif /* NETATALK */
#ifdef MBUFTRACE
m_claimm(m, ifp->if_mowner);
#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 && ifp0->if_link_state == LINK_STATE_UP &&
(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)) != NULL) {
rt->rt_refcnt--;
if (rt->rt_ifp != ifp)
return (*rt->rt_ifp->if_output)
(ifp, m0, dst, rt);
} else
senderr(EHOSTUNREACH);
}
if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) {
if (rt->rt_gwroute == NULL)
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);
if ((rt = rt->rt_gwroute) == NULL)
senderr(EHOSTUNREACH);
/* the "G" test below also prevents rt == rt0 */
if ((rt->rt_flags & RTF_GATEWAY) ||
(rt->rt_ifp != ifp)) {
rt->rt_refcnt--;
rt0->rt_gwroute = NULL;
senderr(EHOSTUNREACH);
}
}
}
if (rt->rt_flags & RTF_REJECT)
if (rt->rt_rmx.rmx_expire == 0 ||
(u_long) time_second < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
if (m->m_flags & M_BCAST)
(void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
else if (m->m_flags & M_MCAST)
ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst);
else if (!arpresolve(ifp, 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))
mcopy = m_copy(m, 0, (int)M_COPYALL);
etype = htons(ETHERTYPE_IP);
break;
case AF_ARP:
ah = mtod(m, struct arphdr *);
if (m->m_flags & M_BCAST)
(void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
else {
void *tha = ar_tha(ah);
if (tha == NULL) {
/* fake with ARPHDR_IEEE1394 */
return 0;
}
memcpy(edst, tha, sizeof(edst));
}
ah->ar_hrd = htons(ARPHRD_ETHER);
switch (ntohs(ah->ar_op)) {
case ARPOP_REVREQUEST:
case ARPOP_REVREPLY:
etype = htons(ETHERTYPE_REVARP);
break;
case ARPOP_REQUEST:
case ARPOP_REPLY:
default:
etype = htons(ETHERTYPE_ARP);
}
break;
#endif
#ifdef INET6
case AF_INET6:
if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){
/* something bad happened */
return (0);
}
etype = htons(ETHERTYPE_IPV6);
break;
#endif
#ifdef NETATALK
case AF_APPLETALK:
if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) {
#ifdef NETATALKDEBUG
printf("aarpresolv failed\n");
#endif /* NETATALKDEBUG */
return (0);
}
/*
* ifaddr is the first thing in at_ifaddr
*/
aa = (struct at_ifaddr *) at_ifawithnet(
(const struct sockaddr_at *)dst, ifp);
if (aa == NULL)
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_DONTWAIT);
llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
llc.llc_control = LLC_UI;
memcpy(llc.llc_snap_org_code, at_org_code,
sizeof(llc.llc_snap_org_code));
llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK);
memcpy(mtod(m, void *), &llc, sizeof(struct llc));
} else {
etype = htons(ETHERTYPE_ATALK);
}
break;
#endif /* NETATALK */
#ifdef IPX
case AF_IPX:
etype = htons(ETHERTYPE_IPX);
memcpy(edst,
&(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host),
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 ISO
case AF_ISO: {
int snpalen;
struct llc *l;
const struct sockaddr_dl *sdl;
if (rt && (sdl = satocsdl(rt->rt_gateway)) &&
sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) {
memcpy(edst, CLLADDR(sdl), sizeof(edst));
} else {
error = iso_snparesolve(ifp,
(const struct sockaddr_iso *)dst,
(char *)edst, &snpalen);
if (error)
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 *);
memcpy(eh->ether_dhost, edst, sizeof(edst));
memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl),
sizeof(edst));
}
}
M_PREPEND(m, 3, M_DONTWAIT);
if (m == NULL)
return (0);
l = mtod(m, struct llc *);
l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;
l->llc_control = LLC_UI;
#ifdef ARGO_DEBUG
if (argo_debug[D_ETHER]) {
int i;
printf("unoutput: sending pkt to: ");
for (i=0; i<6; i++)
printf("%x ", edst[i] & 0xff);
printf("\n");
}
#endif
} break;
#endif /* ISO */
case pseudo_AF_HDRCMPLT:
hdrcmplt = 1;
memcpy(esrc,
((const struct ether_header *)dst->sa_data)->ether_shost,
sizeof(esrc));
/* FALLTHROUGH */
case AF_UNSPEC:
memcpy(edst,
((const struct ether_header *)dst->sa_data)->ether_dhost,
sizeof(edst));
/* AF_UNSPEC doesn't swap the byte order of the ether_type. */
etype = ((const struct ether_header *)dst->sa_data)->ether_type;
break;
default:
printf("%s: can't handle af%d\n", ifp->if_xname,
dst->sa_family);
senderr(EAFNOSUPPORT);
}
if (mcopy)
(void)looutput(ifp, mcopy, dst, rt);
/* If no ether type is set, this must be a 802.2 formatted packet.
*/
if (etype == 0)
etype = htons(m->m_pkthdr.len);
/*
* 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 *);
/* Note: etype is already in network byte order. */
(void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type));
memcpy(eh->ether_dhost, edst, sizeof(edst));
if (hdrcmplt)
memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost));
else
memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl),
sizeof(eh->ether_shost));
#if NCARP > 0
if (ifp0 != ifp && ifp0->if_type == IFT_CARP) {
memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl),
sizeof(eh->ether_shost));
}
#endif /* NCARP > 0 */
#ifdef PFIL_HOOKS
if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0)
return (error);
if (m == NULL)
return (0);
#endif
#if NBRIDGE > 0
/*
* Bridges require special output handling.
*/
if (ifp->if_bridge)
return (bridge_output(ifp, m, NULL, NULL));
#endif
#if NCARP > 0
if (ifp != ifp0)
ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN;
#endif /* NCARP > 0 */
#ifdef ALTQ
/*
* If ALTQ is enabled on the parent interface, do
* classification; the queueing discipline might not
* require classification, but might require the
* address family/header pointer in the pktattr.
*/
if (ALTQ_IS_ENABLED(&ifp->if_snd))
altq_etherclassify(&ifp->if_snd, m, &pktattr);
#endif
return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr));
bad:
if (m)
m_freem(m);
return (error);
}
#ifdef ALTQ
/*
* This routine is a slight hack to allow a packet to be classified
* if the Ethernet headers are present. It will go away when ALTQ's
* classification engine understands link headers.
*/
void
altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
struct altq_pktattr *pktattr)
{
struct ether_header *eh;
uint16_t ether_type;
int hlen, af, hdrsize;
void *hdr;
hlen = ETHER_HDR_LEN;
eh = mtod(m, struct ether_header *);
ether_type = htons(eh->ether_type);
if (ether_type < ETHERMTU) {
/* LLC/SNAP */
struct llc *llc = (struct llc *)(eh + 1);
hlen += 8;
if (m->m_len < hlen ||
llc->llc_dsap != LLC_SNAP_LSAP ||
llc->llc_ssap != LLC_SNAP_LSAP ||
llc->llc_control != LLC_UI) {
/* Not SNAP. */
goto bad;
}
ether_type = htons(llc->llc_un.type_snap.ether_type);
}
switch (ether_type) {
case ETHERTYPE_IP:
af = AF_INET;
hdrsize = 20; /* sizeof(struct ip) */
break;
case ETHERTYPE_IPV6:
af = AF_INET6;
hdrsize = 40; /* sizeof(struct ip6_hdr) */
break;
default:
af = AF_UNSPEC;
hdrsize = 0;
break;
}
while (m->m_len <= hlen) {
hlen -= m->m_len;
m = m->m_next;
}
if (m->m_len < (hlen + hdrsize)) {
/*
* protocol header not in a single mbuf.
* We can't cope with this situation right
* now (but it shouldn't ever happen, really, anyhow).
*/
#ifdef DEBUG
printf("altq_etherclassify: headers span multiple mbufs: "
"%d < %d\n", m->m_len, (hlen + hdrsize));
#endif
goto bad;
}
m->m_data += hlen;
m->m_len -= hlen;
hdr = mtod(m, void *);
if (ALTQ_NEEDS_CLASSIFY(ifq))
pktattr->pattr_class =
(*ifq->altq_classify)(ifq->altq_clfier, m, af);
pktattr->pattr_af = af;
pktattr->pattr_hdr = hdr;
m->m_data -= hlen;
m->m_len += hlen;
return;
bad:
pktattr->pattr_class = NULL;
pktattr->pattr_hdr = NULL;
pktattr->pattr_af = AF_UNSPEC;
}
#endif /* ALTQ */
/*
* Process a received Ethernet packet;
* the packet is in the mbuf chain m with
* the ether header.
*/
void
ether_input(struct ifnet *ifp, struct mbuf *m)
{
struct ethercom *ec = (struct ethercom *) ifp;
struct ifqueue *inq;
uint16_t etype;
struct ether_header *eh;
#if defined (ISO) || defined (LLC) || defined(NETATALK)
struct llc *l;
#endif
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
#ifdef MBUFTRACE
m_claimm(m, &ec->ec_rx_mowner);
#endif
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
/*
* Determine if the packet is within its size limits.
*/
if (m->m_pkthdr.len >
ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count,
bigpktppslim)) {
printf("%s: discarding oversize frame (len=%d)\n",
ifp->if_xname, m->m_pkthdr.len);
}
m_freem(m);
return;
}
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
/*
* If this is not a simplex interface, drop the packet
* if it came from us.
*/
if ((ifp->if_flags & IFF_SIMPLEX) == 0 &&
memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost,
ETHER_ADDR_LEN) == 0) {
m_freem(m);
return;
}
if (memcmp(etherbroadcastaddr,
eh->ether_dhost, ETHER_ADDR_LEN) == 0)
m->m_flags |= M_BCAST;
else
m->m_flags |= M_MCAST;
ifp->if_imcasts++;
}
/* If the CRC is still on the packet, trim it off. */
if (m->m_flags & M_HASFCS) {
m_adj(m, -ETHER_CRC_LEN);
m->m_flags &= ~M_HASFCS;
}
ifp->if_ibytes += m->m_pkthdr.len;
#if NBRIDGE > 0
/*
* Tap the packet off here for a bridge. bridge_input()
* will return NULL if it has consumed the packet, otherwise
* it gets processed as normal. Note that bridge_input()
* will always return the original packet if we need to
* process it locally.
*/
if (ifp->if_bridge) {
/* clear M_PROMISC, in case the packets comes from a vlan */
m->m_flags &= ~M_PROMISC;
m = bridge_input(ifp, m);
if (m == NULL)
return;
/*
* Bridge has determined that the packet is for us.
* Update our interface pointer -- we may have had
* to "bridge" the packet locally.
*/
ifp = m->m_pkthdr.rcvif;
} else
#endif /* NBRIDGE > 0 */
{
#if NCARP > 0
if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) {
/*
* clear M_PROMISC, in case the packets comes from a
* vlan
*/
m->m_flags &= ~M_PROMISC;
if (carp_input(m, (uint8_t *)&eh->ether_shost,
(uint8_t *)&eh->ether_dhost, eh->ether_type) == 0)
return;
}
#endif /* NCARP > 0 */
if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 &&
(ifp->if_flags & IFF_PROMISC) != 0 &&
memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost,
ETHER_ADDR_LEN) != 0) {
m->m_flags |= M_PROMISC;
}
}
#ifdef PFIL_HOOKS
if ((m->m_flags & M_PROMISC) == 0) {
if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0)
return;
if (m == NULL)
return;
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
}
#endif
/*
* If VLANs are configured on the interface, check to
* see if the device performed the decapsulation and
* provided us with the tag.
*/
if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) {
#if NVLAN > 0
/*
* vlan_input() will either recursively call ether_input()
* or drop the packet.
*/
vlan_input(ifp, m);
#else
m_freem(m);
#endif
return;
}
#if NAGR > 0
if (ifp->if_agrprivate &&
__predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) {
m->m_flags &= ~M_PROMISC;
agr_input(ifp, m);
return;
}
#endif /* NAGR > 0 */
/*
* Handle protocols that expect to have the Ethernet header
* (and possibly FCS) intact.
*/
switch (etype) {
#if NVLAN > 0
case ETHERTYPE_VLAN:
/*
* vlan_input() will either recursively call ether_input()
* or drop the packet.
*/
if (((struct ethercom *)ifp)->ec_nvlans != 0)
vlan_input(ifp, m);
else
m_freem(m);
return;
#endif /* NVLAN > 0 */
#if NPPPOE > 0
case ETHERTYPE_PPPOEDISC:
case ETHERTYPE_PPPOE:
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
if (etype == ETHERTYPE_PPPOEDISC)
inq = &ppoediscinq;
else
inq = &ppoeinq;
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
softint_schedule(pppoe_softintr);
return;
#endif /* NPPPOE > 0 */
case ETHERTYPE_SLOWPROTOCOLS: {
uint8_t subtype;
#if defined(DIAGNOSTIC)
if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) {
panic("ether_input: too short slow protocol packet");
}
#endif
m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype);
switch (subtype) {
#if NAGR > 0
case SLOWPROTOCOLS_SUBTYPE_LACP:
if (ifp->if_agrprivate) {
ieee8023ad_lacp_input(ifp, m);
return;
}
break;
case SLOWPROTOCOLS_SUBTYPE_MARKER:
if (ifp->if_agrprivate) {
ieee8023ad_marker_input(ifp, m);
return;
}
break;
#endif /* NAGR > 0 */
default:
if (subtype == 0 || subtype > 10) {
/* illegal value */
m_freem(m);
return;
}
/* unknown subtype */
break;
}
/* FALLTHROUGH */
}
default:
if (m->m_flags & M_PROMISC) {
m_freem(m);
return;
}
}
/* If the CRC is still on the packet, trim it off. */
if (m->m_flags & M_HASFCS) {
m_adj(m, -ETHER_CRC_LEN);
m->m_flags &= ~M_HASFCS;
}
if (etype > ETHERMTU + sizeof (struct ether_header)) {
/* Strip off the Ethernet header. */
m_adj(m, sizeof(struct ether_header));
switch (etype) {
#ifdef INET
case ETHERTYPE_IP:
#ifdef GATEWAY
if (ipflow_fastforward(m))
return;
#endif
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
case ETHERTYPE_ARP:
schednetisr(NETISR_ARP);
inq = &arpintrq;
break;
case ETHERTYPE_REVARP:
revarpinput(m); /* XXX queue? */
return;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
#ifdef GATEWAY
if (ip6flow_fastforward(m))
return;
#endif
schednetisr(NETISR_IPV6);
inq = &ip6intrq;
break;
#endif
#ifdef IPX
case ETHERTYPE_IPX:
schednetisr(NETISR_IPX);
inq = &ipxintrq;
break;
#endif
#ifdef NETATALK
case ETHERTYPE_ATALK:
schednetisr(NETISR_ATALK);
inq = &atintrq1;
break;
case ETHERTYPE_AARP:
/* probably this should be done with a NETISR as well */
aarpinput(ifp, m); /* XXX */
return;
#endif /* NETATALK */
default:
m_freem(m);
return;
}
} else {
#if defined (ISO) || defined (LLC) || defined (NETATALK)
l = (struct llc *)(eh+1);
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 (memcmp(&(l->llc_snap_org_code)[0],
at_org_code, sizeof(at_org_code)) == 0 &&
ntohs(l->llc_snap_ether_type) ==
ETHERTYPE_ATALK) {
inq = &atintrq2;
m_adj(m, sizeof(struct ether_header)
+ sizeof(struct llc));
schednetisr(NETISR_ATALK);
break;
}
if (memcmp(&(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 ether_header)
+ sizeof(struct llc));
aarpinput(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) && /* XXX? case tested */
(l->llc_ssap == LLC_ISO_LSAP)) {
/* LSAP for ISO */
/* XXX length computation?? */
if (m->m_pkthdr.len > etype + sizeof(struct ether_header))
m_adj(m, etype - m->m_pkthdr.len);
#ifdef ARGO_DEBUG
if (argo_debug[D_ETHER])
printf("clnp packet");
#endif
schednetisr(NETISR_ISO);
inq = &clnlintrq;
break;
}
goto dropanyway;
case LLC_XID:
case LLC_XID_P:
if(m->m_len < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header))
/* XXX m_pullup? */
goto dropanyway;
l->llc_window = 0;
l->llc_fid = LLC_XID_FORMAT_BASIC;
l->llc_class = LLC_XID_CLASS_I;
l->llc_dsap = l->llc_ssap = 0;
/* Fall through to */
case LLC_TEST:
case LLC_TEST_P:
{
struct sockaddr sa;
struct ether_header *eh2;
int i;
u_char c = l->llc_dsap;
l->llc_dsap = l->llc_ssap;
l->llc_ssap = c;
m_adj(m, sizeof(struct ether_header));
/* XXX we can optimize here? */
if (m->m_flags & (M_BCAST | M_MCAST))
memcpy(eh->ether_dhost,
CLLADDR(ifp->if_sadl),
ETHER_ADDR_LEN);