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NetBSD/sys/net/if_ethersubr.c

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/* $NetBSD: if_ethersubr.c,v 1.99 2002/09/11 05:36:26 itojun 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. 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 8.2 (Berkeley) 4/4/96
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.99 2002/09/11 05:36:26 itojun Exp $");
#include "opt_inet.h"
#include "opt_atalk.h"
#include "opt_ccitt.h"
#include "opt_llc.h"
#include "opt_iso.h"
#include "opt_ns.h"
#include "opt_gateway.h"
#include "opt_pfil_hooks.h"
#include "vlan.h"
#include "pppoe.h"
#include "bridge.h"
#include "bpfilter.h"
#include "arp.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 <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_types.h>
#if NARP == 0
/*
* XXX there should realy be a way to issue this warning from within config(8)
*/
#error You have included a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you realy need pseudo-device bridge, ppppoe or vlan.
#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 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
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.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 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;}
#define SIN(x) ((struct sockaddr_in *)x)
static int ether_output __P((struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *));
static void ether_input __P((struct ifnet *, struct mbuf *));
/*
* 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 *ifp, struct mbuf *m0, struct sockaddr *dst,
struct rtentry *rt0)
{
u_int16_t etype = 0;
int s, len, error = 0, hdrcmplt = 0;
u_char esrc[6], edst[6];
struct mbuf *m = m0;
struct rtentry *rt;
struct mbuf *mcopy = (struct mbuf *)0;
struct ether_header *eh;
ALTQ_DECL(struct altq_pktattr pktattr;)
#ifdef INET
struct arphdr *ah;
#endif /* INET */
#ifdef NETATALK
struct at_ifaddr *aa;
#endif /* NETATALK */
short mflags;
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 == 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);
if ((rt = rt->rt_gwroute) == 0)
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 = 0;
senderr(EHOSTUNREACH);
}
}
}
if (rt->rt_flags & RTF_REJECT)
if (rt->rt_rmx.rmx_expire == 0 ||
(u_long) time.tv_sec < 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)
bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst,
sizeof(edst));
else if (m->m_flags & M_MCAST) {
ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr,
(caddr_t)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)
bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst,
sizeof(edst));
else
bcopy((caddr_t)ar_tha(ah),
(caddr_t)edst, 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, (u_char *)edst)){
/* something bad happened */
return (0);
}
etype = htons(ETHERTYPE_IPV6);
break;
#endif
#ifdef NETATALK
case AF_APPLETALK:
if (!aarpresolve(ifp, m, (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(
(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;
bcopy(at_org_code, llc.llc_snap_org_code,
sizeof(llc.llc_snap_org_code));
llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK);
bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
} else {
etype = htons(ETHERTYPE_ATALK);
}
break;
#endif /* NETATALK */
#ifdef NS
case AF_NS:
etype = 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 IPX
case AF_IPX:
etype = htons(ETHERTYPE_IPX);
bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_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 ISO
case AF_ISO: {
int snpalen;
struct llc *l;
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 {
error = iso_snparesolve(ifp, (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 *);
bcopy((caddr_t)edst,
(caddr_t)eh->ether_dhost, sizeof (edst));
bcopy(LLADDR(ifp->if_sadl),
(caddr_t)eh->ether_shost, 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 */
#ifdef LLC
/* case AF_NSAP: */
case AF_CCITT: {
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(LLADDR(ifp->if_sadl),
(caddr_t)eh->ether_shost, sizeof (edst));
}
}
#ifdef LLC_DEBUG
{
int i;
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",
m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff,
l->llc_control & 0xff);
}
#endif /* LLC_DEBUG */
} break;
#endif /* LLC */
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);
}
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. */
#ifdef __NO_STRICT_ALIGNMENT
eh->ether_type = etype;
#else
{
uint8_t *dstp = (uint8_t *) &eh->ether_type;
#if BYTE_ORDER == BIG_ENDIAN
dstp[0] = etype >> 8;
dstp[1] = etype;
#else
dstp[0] = etype;
dstp[1] = etype >> 8;
#endif /* BYTE_ORDER == BIG_ENDIAN */
}
#endif /* __NO_STRICT_ALIGNMENT */
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(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost,
sizeof(eh->ether_shost));
#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
#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
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, &pktattr, error);
if (error) {
/* mbuf is already freed */
splx(s);
return (error);
}
ifp->if_obytes += len;
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);
}
#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;
u_int16_t ether_type;
int hlen, af, hdrsize;
caddr_t 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, caddr_t);
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.
*/
static void
ether_input(struct ifnet *ifp, struct mbuf *m)
{
struct ethercom *ec = (struct ethercom *) ifp;
struct ifqueue *inq;
u_int16_t etype;
int s;
struct ether_header *eh;
struct mbuf *n;
#if defined (ISO) || defined (LLC) || defined(NETATALK)
struct llc *l;
#endif
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
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)) {
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(LLADDR(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) {
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;
}
#endif /* NBRIDGE > 0 */
/*
* XXX This comparison is redundant if we are a bridge
* XXX and processing the packet locally.
*/
if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 &&
(ifp->if_flags & IFF_PROMISC) != 0 &&
memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost,
ETHER_ADDR_LEN) != 0) {
m_freem(m);
return;
}
#ifdef PFIL_HOOKS
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 &&
(n = m_aux_find(m, AF_LINK, ETHERTYPE_VLAN)) != 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;
}
/*
* 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 (etype == ETHERTYPE_PPPOEDISC)
inq = &ppoediscinq;
else
inq = &ppoeinq;
s = splnet();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
#ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
if (!callout_active(&pppoe_softintr))
callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL);
#else
softintr_schedule(pppoe_softintr);
#endif
return;
#endif /* NPPPOE > 0 */
default:
; /* Nothing. */
}
/* Strip off the Ethernet header. */
m_adj(m, sizeof(struct ether_header));
/* 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;
}
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:
schednetisr(NETISR_IPV6);
inq = &ip6intrq;
break;
#endif
#ifdef NS
case ETHERTYPE_NS:
schednetisr(NETISR_NS);
inq = &nsintrq;
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:
#if defined (ISO) || defined (LLC) || defined (NETATALK)
if (etype > 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_ATALK) {
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(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 > etype)
m_adj(m, etype - 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;
#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 < 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;
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(LLADDR(ifp->if_sadl),
(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 > etype)
m_adj(m, etype - 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 = etype;
#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 = splnet();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
}
/*
* Convert Ethernet address to printable (loggable) representation.
*/
static char digits[] = "0123456789abcdef";
char *
ether_sprintf(const u_char *ap)
{
static char etherbuf[18];
char *cp = etherbuf;
int i;
for (i = 0; i < 6; 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(struct ifnet *ifp, const u_int8_t *lla)
{
ifp->if_type = IFT_ETHER;
ifp->if_addrlen = ETHER_ADDR_LEN;
ifp->if_hdrlen = ETHER_HDR_LEN;
ifp->if_dlt = DLT_EN10MB;
ifp->if_mtu = ETHERMTU;
ifp->if_output = ether_output;
ifp->if_input = ether_input;
if (ifp->if_baudrate == 0)
ifp->if_baudrate = IF_Mbps(10); /* just a default */
if_alloc_sadl(ifp);
memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen);
LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs);
ifp->if_broadcastaddr = etherbroadcastaddr;
#if NBPFILTER > 0
bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
#endif
}
void
ether_ifdetach(struct ifnet *ifp)
{
struct ethercom *ec = (void *) ifp;
struct ether_multi *enm;
int s;
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
#if NVLAN > 0
if (ec->ec_nvlans)
vlan_ifdetach(ifp);
#endif
s = splnet();
while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) {
LIST_REMOVE(enm, enm_list);
free(enm, M_IFADDR);
ec->ec_multicnt--;
}
splx(s);
if_free_sadl(ifp);
}
#if 0
/*
* This is for reference. We have a table-driven version
* of the little-endian crc32 generator, which is 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);
}
#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
};
u_int32_t crc;
size_t i;
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);
}
#endif
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);
}
#ifdef INET
u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
#endif
#ifdef INET6
u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
u_char ether_ip6multicast_max[6] = { 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);
break;
#ifdef INET
case AF_INET:
sin = satosin(sa);
if (sin->sin_addr.s_addr == INADDR_ANY) {
/*
* An IP address of INADDR_ANY means listen to
* or stop listening to all of the Ethernet
* multicast addresses used for IP.
* (This is for the sake of IP multicast routers.)
*/
bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN);
bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN);
}
else {
ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
}
break;
#endif
#ifdef INET6
case AF_INET6:
sin6 = satosin6(sa);
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
/*
* An IP6 address of 0 means listen to or stop
* listening to all of the Ethernet multicast
* address used for IP6.
* (This is used for multicast routers.)
*/
bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN);
bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN);
} else {
ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo);
bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
}
break;
#endif
default:
return (EAFNOSUPPORT);
}
return (0);
}
/*
* Add an Ethernet multicast address or range of addresses to the list for a
* given interface.
*/
int
ether_addmulti(struct ifreq *ifr, struct ethercom *ec)
{
struct ether_multi *enm;
u_char addrlo[ETHER_ADDR_LEN];
u_char addrhi[ETHER_ADDR_LEN];
int s = splnet(), error;
error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
if (error != 0) {
splx(s);
return (error);
}
/*
* 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, ec, 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_ec = ec;
enm->enm_refcount = 1;
LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list);
ec->ec_multicnt++;
splx(s);
/*
* 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(struct ifreq *ifr, struct ethercom *ec)
{
struct ether_multi *enm;
u_char addrlo[ETHER_ADDR_LEN];
u_char addrhi[ETHER_ADDR_LEN];
int s = splnet(), error;
error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
if (error != 0) {
splx(s);
return (error);
}
/*
* Look ur the address in our list.
*/
ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, 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.
*/
LIST_REMOVE(enm, enm_list);
free(enm, M_IFMADDR);
ec->ec_multicnt--;
splx(s);
/*
* Return ENETRESET to inform the driver that the list has changed
* and its reception filter should be adjusted accordingly.
*/
return (ENETRESET);
}
/*
* Common ioctls for Ethernet interfaces. Note, we must be
* called at splnet().
*/
int
ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ethercom *ec = (void *) ifp;
struct ifreq *ifr = (struct ifreq *)data;
struct ifaddr *ifa = (struct ifaddr *)data;
int error = 0;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
case AF_LINK:
{
struct sockaddr_dl *sdl =
(struct sockaddr_dl *) ifa->ifa_addr;
if (sdl->sdl_type != IFT_ETHER ||
sdl->sdl_alen != ifp->if_addrlen) {
error = EINVAL;
break;
}
memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl),
ifp->if_addrlen);
/* Set new address. */
error = (*ifp->if_init)(ifp);
break;
}
#ifdef INET
case AF_INET:
if ((ifp->if_flags & IFF_RUNNING) == 0 &&
(error = (*ifp->if_init)(ifp)) != 0)
break;
arp_ifinit(ifp, ifa);
break;
#endif /* INET */
#ifdef NS
case AF_NS:
{
struct ns_addr *ina = &IA_SNS(ifa)->sns_addr;
if (ns_nullhost(*ina))
ina->x_host = *(union ns_host *)
LLADDR(ifp->if_sadl);
else
memcpy(LLADDR(ifp->if_sadl),
ina->x_host.c_host, ifp->if_addrlen);
/* Set new address. */
error = (*ifp->if_init)(ifp);
break;
}
#endif /* NS */
default:
if ((ifp->if_flags & IFF_RUNNING) == 0)
error = (*ifp->if_init)(ifp);
break;
}
break;
case SIOCGIFADDR:
memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data,
LLADDR(ifp->if_sadl), ETHER_ADDR_LEN);
break;
case SIOCSIFMTU:
{
int maxmtu;
if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU)
maxmtu = ETHERMTU_JUMBO;
else
maxmtu = ETHERMTU;
if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu)
error = EINVAL;
else {
ifp->if_mtu = ifr->ifr_mtu;
/* Make sure the device notices the MTU change. */
if (ifp->if_flags & IFF_UP)
error = (*ifp->if_init)(ifp);
}
break;
}
case SIOCSIFFLAGS:
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) {
/*
* If interface is marked down and it is running,
* then stop and disable it.
*/
(*ifp->if_stop)(ifp, 1);
} else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) {
/*
* If interface is marked up and it is stopped, then
* start it.
*/
error = (*ifp->if_init)(ifp);
} else if ((ifp->if_flags & IFF_UP) != 0) {
/*
* Reset the interface to pick up changes in any other
* flags that affect the hardware state.
*/
error = (*ifp->if_init)(ifp);
}
break;
case SIOCADDMULTI:
error = ether_addmulti(ifr, ec);
break;
case SIOCDELMULTI:
error = ether_delmulti(ifr, ec);
break;
default:
error = ENOTTY;
}
return (error);
}
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