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freebsd-dev/sys/net/if_ethersubr.c
Warner Losh a163d034fa Back out M_* changes, per decision of the TRB. 
Approved by: trb
2003-02-19 05:47:46 +00:00

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/*
* 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
* $FreeBSD$
*/
#include "opt_atalk.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipx.h"
#include "opt_bdg.h"
#include "opt_mac.h"
#include "opt_netgraph.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mac.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/random.h>
#include <sys/socket.h>
#include <sys/sockio.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>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/bridge.h>
#include <net/if_vlan_var.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <netinet/ip_fw.h>
#include <netinet/ip_dummynet.h>
#endif
#ifdef INET6
#include <netinet6/nd6.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
struct sockaddr *dst, short *tp, int *hlen);
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
ushort ns_nettype;
int ether_outputdebug = 0;
int ether_inputdebug = 0;
#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 */
/* netgraph node hooks for ng_ether(4) */
void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
void (*ng_ether_attach_p)(struct ifnet *ifp);
void (*ng_ether_detach_p)(struct ifnet *ifp);
void (*vlan_input_p)(struct ifnet *, struct mbuf *);
/* bridge support */
int do_bridge;
bridge_in_t *bridge_in_ptr;
bdg_forward_t *bdg_forward_ptr;
bdgtakeifaces_t *bdgtakeifaces_ptr;
struct bdg_softc *ifp2sc;
static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
struct sockaddr *);
u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
#define senderr(e) do { error = (e); goto bad;} while (0)
#define IFP2AC(IFP) ((struct arpcom *)IFP)
int
ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
struct ip_fw **rule, int shared);
static int ether_ipfw;
/*
* 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, m, dst, rt0)
register struct ifnet *ifp;
struct mbuf *m;
struct sockaddr *dst;
struct rtentry *rt0;
{
short type;
int error = 0, hdrcmplt = 0;
u_char esrc[6], edst[6];
register struct rtentry *rt;
register struct ether_header *eh;
int loop_copy = 0;
int hlen; /* link layer header lenght */
struct arpcom *ac = IFP2AC(ifp);
#ifdef MAC
error = mac_check_ifnet_transmit(ifp, m);
if (error)
senderr(error);
#endif
if (ifp->if_flags & IFF_MONITOR)
senderr(ENETDOWN);
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_second < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
hlen = ETHER_HDR_LEN;
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
if (!arpresolve(ifp, rt, m, dst, edst, rt0))
return (0); /* if not yet resolved */
type = htons(ETHERTYPE_IP);
break;
#endif
#ifdef INET6
case AF_INET6:
if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {
/* Something bad happened */
return(0);
}
type = htons(ETHERTYPE_IPV6);
break;
#endif
#ifdef IPX
case AF_IPX:
if (ef_outputp) {
error = ef_outputp(ifp, &m, dst, &type, &hlen);
if (error)
goto bad;
} else
type = htons(ETHERTYPE_IPX);
bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
(caddr_t)edst, sizeof (edst));
break;
#endif
#ifdef NETATALK
case AF_APPLETALK:
{
struct at_ifaddr *aa;
if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {
goto bad;
}
if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))
return (0);
/*
* In the phase 2 case, 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_TRYWAIT);
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);
hlen = sizeof(struct llc) + ETHER_HDR_LEN;
} else {
type = htons(ETHERTYPE_AT);
}
break;
}
#endif /* NETATALK */
#ifdef NS
case AF_NS:
switch(ns_nettype){
default:
case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
type = 0x8137;
break;
case 0x0: /* Novell 802.3 */
type = htons( m->m_pkthdr.len);
break;
case 0xe0e0: /* Novell 802.2 and Token-Ring */
M_PREPEND(m, 3, M_TRYWAIT);
type = htons( m->m_pkthdr.len);
cp = mtod(m, u_char *);
*cp++ = 0xE0;
*cp++ = 0xE0;
*cp++ = 0x03;
break;
}
bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),
(caddr_t)edst, sizeof (edst));
/*
* XXX if ns_thishost is the same as the node's ethernet
* address then just the default code will catch this anyhow.
* So I'm not sure if this next clause should be here at all?
* [JRE]
*/
if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){
m->m_pkthdr.rcvif = ifp;
inq = &nsintrq;
if (IF_HANDOFF(inq, m, NULL))
schednetisr(NETISR_NS);
return (error);
}
if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){
m->m_flags |= M_BCAST;
}
break;
#endif /* NS */
case pseudo_AF_HDRCMPLT:
hdrcmplt = 1;
eh = (struct ether_header *)dst->sa_data;
(void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
/* FALLTHROUGH */
case AF_UNSPEC:
loop_copy = -1; /* if this is for us, don't do it */
eh = (struct ether_header *)dst->sa_data;
(void)memcpy(edst, eh->ether_dhost, sizeof (edst));
type = eh->ether_type;
break;
default:
if_printf(ifp, "can't handle af%d\n", dst->sa_family);
senderr(EAFNOSUPPORT);
}
/*
* 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));
if (hdrcmplt)
(void)memcpy(eh->ether_shost, esrc,
sizeof(eh->ether_shost));
else
(void)memcpy(eh->ether_shost, ac->ac_enaddr,
sizeof(eh->ether_shost));
/*
* If a simplex interface, and the packet is being sent to our
* Ethernet address or a broadcast address, loopback a copy.
* XXX To make a simplex device behave exactly like a duplex
* device, we should copy in the case of sending to our own
* ethernet address (thus letting the original actually appear
* on the wire). However, we don't do that here for security
* reasons and compatibility with the original behavior.
*/
if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
int csum_flags = 0;
if (m->m_pkthdr.csum_flags & CSUM_IP)
csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
n->m_pkthdr.csum_flags |= csum_flags;
if (csum_flags & CSUM_DATA_VALID)
n->m_pkthdr.csum_data = 0xffff;
(void) if_simloop(ifp, n, dst->sa_family, hlen);
} else if (bcmp(eh->ether_dhost,
eh->ether_shost, ETHER_ADDR_LEN) == 0) {
m->m_pkthdr.csum_flags |= csum_flags;
if (csum_flags & CSUM_DATA_VALID)
m->m_pkthdr.csum_data = 0xffff;
(void) if_simloop(ifp, m, dst->sa_family, hlen);
return (0); /* XXX */
}
}
/* Handle ng_ether(4) processing, if any */
if (ng_ether_output_p != NULL) {
if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
bad: if (m != NULL)
m_freem(m);
return (error);
}
if (m == NULL)
return (0);
}
/* Continue with link-layer output */
return ether_output_frame(ifp, m);
}
/*
* Ethernet link layer output routine to send a raw frame to the device.
*
* This assumes that the 14 byte Ethernet header is present and contiguous
* in the first mbuf (if BRIDGE'ing).
*/
int
ether_output_frame(struct ifnet *ifp, struct mbuf *m)
{
struct ip_fw *rule = NULL;
/* Extract info from dummynet tag, ignore others */
for (; m->m_type == MT_TAG; m = m->m_next)
if (m->m_flags == PACKET_TAG_DUMMYNET)
rule = ((struct dn_pkt *)m)->rule;
if (rule == NULL && BDG_ACTIVE(ifp)) {
/*
* Beware, the bridge code notices the null rcvif and
* uses that identify that it's being called from
* ether_output as opposd to ether_input. Yech.
*/
m->m_pkthdr.rcvif = NULL;
m = bdg_forward_ptr(m, ifp);
if (m != NULL)
m_freem(m);
return (0);
}
if (IPFW_LOADED && ether_ipfw != 0) {
if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) {
if (m) {
m_freem(m);
return ENOBUFS; /* pkt dropped */
} else
return 0; /* consumed e.g. in a pipe */
}
}
/*
* Queue message on interface, update output statistics if
* successful, and start output if interface not yet active.
*/
return (IF_HANDOFF(&ifp->if_snd, m, ifp) ? 0 : ENOBUFS);
}
/*
* ipfw processing for ethernet packets (in and out).
* The second parameter is NULL from ether_demux, and ifp from
* ether_output_frame. This section of code could be used from
* bridge.c as well as long as we use some extra info
* to distinguish that case from ether_output_frame();
*/
int
ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
struct ip_fw **rule, int shared)
{
struct ether_header *eh;
struct ether_header save_eh;
struct mbuf *m;
int i;
struct ip_fw_args args;
if (*rule != NULL && fw_one_pass)
return 1; /* dummynet packet, already partially processed */
/*
* I need some amt of data to be contiguous, and in case others need
* the packet (shared==1) also better be in the first mbuf.
*/
m = *m0;
i = min( m->m_pkthdr.len, max_protohdr);
if ( shared || m->m_len < i) {
m = m_pullup(m, i);
if (m == NULL) {
*m0 = m;
return 0;
}
}
eh = mtod(m, struct ether_header *);
save_eh = *eh; /* save copy for restore below */
m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
args.m = m; /* the packet we are looking at */
args.oif = dst; /* destination, if any */
args.divert_rule = 0; /* we do not support divert yet */
args.rule = *rule; /* matching rule to restart */
args.next_hop = NULL; /* we do not support forward yet */
args.eh = &save_eh; /* MAC header for bridged/MAC packets */
i = ip_fw_chk_ptr(&args);
m = args.m;
if (m != NULL) {
/*
* Restore Ethernet header, as needed, in case the
* mbuf chain was replaced by ipfw.
*/
M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
if (m == NULL) {
*m0 = m;
return 0;
}
if (eh != mtod(m, struct ether_header *))
bcopy(&save_eh, mtod(m, struct ether_header *),
ETHER_HDR_LEN);
}
*m0 = m;
*rule = args.rule;
if ( (i & IP_FW_PORT_DENY_FLAG) || m == NULL) /* drop */
return 0;
if (i == 0) /* a PASS rule. */
return 1;
if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) {
/*
* Pass the pkt to dummynet, which consumes it.
* If shared, make a copy and keep the original.
*/
if (shared) {
m = m_copypacket(m, M_DONTWAIT);
if (m == NULL)
return 0;
} else {
/*
* Pass the original to dummynet and
* nothing back to the caller
*/
*m0 = NULL ;
}
ip_dn_io_ptr(m, (i & 0xffff),
dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
return 0;
}
/*
* XXX at some point add support for divert/forward actions.
* If none of the above matches, we have to drop the pkt.
*/
return 0;
}
/*
* Process a received Ethernet packet; the packet is in the
* mbuf chain m with the ethernet header at the front.
*/
static void
ether_input(struct ifnet *ifp, struct mbuf *m)
{
struct ether_header *eh;
u_short etype;
/*
* Do consistency checks to verify assumptions
* made by code past this point.
*/
if ((m->m_flags & M_PKTHDR) == 0) {
if_printf(ifp, "discard frame w/o packet header\n");
ifp->if_ierrors++;
m_freem(m);
return;
}
if (m->m_len < sizeof (struct ether_header)) {
/* XXX maybe should pullup? */
if_printf(ifp, "discard frame w/o leading ethernet "
"header (len %u pkt len %u)\n",
m->m_len, m->m_pkthdr.len);
ifp->if_ierrors++;
m_freem(m);
return;
}
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
if (m->m_pkthdr.len >
ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
if_printf(ifp, "discard oversize frame "
"(ether type %x flags %x len %u > max %lu)\n",
etype, m->m_flags, m->m_pkthdr.len,
ETHER_MAX_FRAME(ifp, etype,
m->m_flags & M_HASFCS));
ifp->if_ierrors++;
m_freem(m);
return;
}
if (m->m_pkthdr.rcvif == NULL) {
if_printf(ifp, "discard frame w/o interface pointer\n");
ifp->if_ierrors++;
m_freem(m);
return;
}
#ifdef DIAGNOSTIC
if (m->m_pkthdr.rcvif != ifp) {
if_printf(ifp, "Warning, frame marked as received on %s%u\n",
m->m_pkthdr.rcvif->if_name,
m->m_pkthdr.rcvif->if_unit);
}
#endif
/*
* Give bpf a chance at the packet.
*/
BPF_MTAP(ifp, m);
if (ifp->if_flags & IFF_MONITOR) {
/*
* Interface marked for monitoring; discard packet.
*/
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;
}
#ifdef MAC
mac_create_mbuf_from_ifnet(ifp, m);
#endif
ifp->if_ibytes += m->m_pkthdr.len;
/* Handle ng_ether(4) processing, if any */
if (ng_ether_input_p != NULL) {
(*ng_ether_input_p)(ifp, &m);
if (m == NULL)
return;
}
/* Check for bridging mode */
if (BDG_ACTIVE(ifp) ) {
struct ifnet *bif;
/*
* Check with bridging code to see how the packet
* should be handled. Possibilities are:
*
* BDG_BCAST broadcast
* BDG_MCAST multicast
* BDG_LOCAL for local address, don't forward
* BDG_DROP discard
* ifp forward only to specified interface(s)
*
* Non-local destinations are handled by passing the
* packet back to the bridge code.
*/
bif = bridge_in_ptr(ifp, eh);
if (bif == BDG_DROP) { /* discard packet */
m_freem(m);
return;
}
if (bif != BDG_LOCAL) { /* non-local, forward */
m = bdg_forward_ptr(m, bif);
/*
* The bridge may consume the packet if it's not
* supposed to be passed up or if a problem occurred
* while doing its job. This is reflected by it
* returning a NULL mbuf pointer.
*/
if (m == NULL) {
if (bif == BDG_BCAST || bif == BDG_MCAST)
if_printf(ifp,
"bridge dropped %s packet\n",
bif == BDG_BCAST ? "broadcast" :
"multicast");
return;
}
/*
* But in some cases the bridge may return the
* packet for us to free; sigh.
*/
if (bif != BDG_BCAST && bif != BDG_MCAST) {
m_freem(m);
return;
}
}
}
ether_demux(ifp, m);
/* First chunk of an mbuf contains good entropy */
if (harvest.ethernet)
random_harvest(m, 16, 3, 0, RANDOM_NET);
}
/*
* Upper layer processing for a received Ethernet packet.
*/
void
ether_demux(struct ifnet *ifp, struct mbuf *m)
{
struct ether_header *eh;
struct ifqueue *inq;
u_short ether_type;
#if defined(NETATALK)
register struct llc *l;
#endif
struct ip_fw *rule = NULL;
/* Extract info from dummynet tag, ignore others */
for (;m->m_type == MT_TAG; m = m->m_next)
if (m->m_flags == PACKET_TAG_DUMMYNET) {
rule = ((struct dn_pkt *)m)->rule;
ifp = m->m_next->m_pkthdr.rcvif;
}
KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer"));
eh = mtod(m, struct ether_header *);
if (rule) /* packet was already bridged */
goto post_stats;
if (!(BDG_ACTIVE(ifp))) {
/*
* Discard packet if upper layers shouldn't see it because it
* was unicast to a different Ethernet address. If the driver
* is working properly, then this situation can only happen
* when the interface is in promiscuous mode.
*/
if ((ifp->if_flags & IFF_PROMISC) != 0
&& (eh->ether_dhost[0] & 1) == 0
&& bcmp(eh->ether_dhost,
IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0
&& (ifp->if_flags & IFF_PPROMISC) == 0) {
m_freem(m);
return;
}
}
/* Discard packet if interface is not up */
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
if (eh->ether_dhost[0] & 1) {
if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
sizeof(etherbroadcastaddr)) == 0)
m->m_flags |= M_BCAST;
else
m->m_flags |= M_MCAST;
}
if (m->m_flags & (M_BCAST|M_MCAST))
ifp->if_imcasts++;
post_stats:
if (IPFW_LOADED && ether_ipfw != 0) {
if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) {
if (m)
m_freem(m);
return;
}
}
/*
* If VLANs are configured on the interface, check to
* see if the device performed the decapsulation and
* provided us with the tag.
*/
if (ifp->if_nvlans &&
m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) {
/*
* vlan_input() will either recursively call ether_input()
* or drop the packet.
*/
KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!"));
(*vlan_input_p)(ifp, m);
return;
}
ether_type = ntohs(eh->ether_type);
/*
* Handle protocols that expect to have the Ethernet header
* (and possibly FCS) intact.
*/
switch (ether_type) {
case ETHERTYPE_VLAN:
if (ifp->if_nvlans != 0) {
KASSERT(vlan_input_p,("ether_input: VLAN not loaded!"));
(*vlan_input_p)(ifp, m);
} else {
ifp->if_noproto++;
m_freem(m);
}
return;
}
/* Strip off 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 (ether_type) {
#ifdef INET
case ETHERTYPE_IP:
if (ipflow_fastforward(m))
return;
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
case ETHERTYPE_ARP:
if (ifp->if_flags & IFF_NOARP) {
/* Discard packet if ARP is disabled on interface */
m_freem(m);
return;
}
schednetisr(NETISR_ARP);
inq = &arpintrq;
break;
#endif
#ifdef IPX
case ETHERTYPE_IPX:
if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
return;
schednetisr(NETISR_IPX);
inq = &ipxintrq;
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
schednetisr(NETISR_IPV6);
inq = &ip6intrq;
break;
#endif
#ifdef NS
case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */
schednetisr(NETISR_NS);
inq = &nsintrq;
break;
#endif /* NS */
#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(IFP2AC(ifp), m); /* XXX */
return;
#endif /* NETATALK */
default:
#ifdef IPX
if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
return;
#endif /* IPX */
#ifdef NS
checksum = mtod(m, ushort *);
/* Novell 802.3 */
if ((ether_type <= ETHERMTU) &&
((*checksum == 0xffff) || (*checksum == 0xE0E0))){
if(*checksum == 0xE0E0) {
m->m_pkthdr.len -= 3;
m->m_len -= 3;
m->m_data += 3;
}
schednetisr(NETISR_NS);
inq = &nsintrq;
break;
}
#endif /* NS */
#if defined(NETATALK)
if (ether_type > ETHERMTU)
goto discard;
l = mtod(m, struct llc *);
switch (l->llc_dsap) {
case LLC_SNAP_LSAP:
switch (l->llc_control) {
case LLC_UI:
if (l->llc_ssap != LLC_SNAP_LSAP)
goto discard;
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(IFP2AC(ifp), m); /* XXX */
return;
}
default:
goto discard;
}
break;
default:
goto discard;
}
#else /* NETATALK */
goto discard;
#endif /* NETATALK */
}
(void) IF_HANDOFF(inq, m, NULL);
return;
discard:
/*
* Packet is to be discarded. If netgraph is present,
* hand the packet to it for last chance processing;
* otherwise dispose of it.
*/
if (ng_ether_input_orphan_p != NULL) {
/*
* Put back the ethernet header so netgraph has a
* consistent view of inbound packets.
*/
M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
(*ng_ether_input_orphan_p)(ifp, m);
return;
}
m_freem(m);
}
/*
* Convert Ethernet address to printable (loggable) representation.
* This routine is for compatibility; it's better to just use
*
* printf("%6D", <pointer to address>, ":");
*
* since there's no static buffer involved.
*/
char *
ether_sprintf(const u_char *ap)
{
static char etherbuf[18];
snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
return (etherbuf);
}
/*
* Perform common duties while attaching to interface list
*/
void
ether_ifattach(struct ifnet *ifp, const u_int8_t *llc)
{
register struct ifaddr *ifa;
register struct sockaddr_dl *sdl;
ifp->if_type = IFT_ETHER;
ifp->if_addrlen = ETHER_ADDR_LEN;
ifp->if_hdrlen = ETHER_HDR_LEN;
if_attach(ifp);
ifp->if_mtu = ETHERMTU;
ifp->if_output = ether_output;
ifp->if_input = ether_input;
ifp->if_resolvemulti = ether_resolvemulti;
if (ifp->if_baudrate == 0)
ifp->if_baudrate = IF_Mbps(10); /* just a default */
ifp->if_broadcastaddr = etherbroadcastaddr;
ifa = ifaddr_byindex(ifp->if_index);
KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ifp->if_addrlen;
bcopy(llc, LLADDR(sdl), ifp->if_addrlen);
/*
* XXX: This doesn't belong here; we do it until
* XXX: all drivers are cleaned up
*/
if (llc != IFP2AC(ifp)->ac_enaddr)
bcopy(llc, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
if (ng_ether_attach_p != NULL)
(*ng_ether_attach_p)(ifp);
if (BDG_LOADED)
bdgtakeifaces_ptr();
}
/*
* Perform common duties while detaching an Ethernet interface
*/
void
ether_ifdetach(struct ifnet *ifp)
{
if (ng_ether_detach_p != NULL)
(*ng_ether_detach_p)(ifp);
bpfdetach(ifp);
if_detach(ifp);
if (BDG_LOADED)
bdgtakeifaces_ptr();
}
SYSCTL_DECL(_net_link);
SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
&ether_ipfw,0,"Pass ether pkts through firewall");
int
ether_ioctl(ifp, command, data)
struct ifnet *ifp;
int command;
caddr_t data;
{
struct ifaddr *ifa = (struct ifaddr *) data;
struct ifreq *ifr = (struct ifreq *) data;
int error = 0;
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
ifp->if_init(ifp->if_softc); /* before arpwhohas */
arp_ifinit(ifp, ifa);
break;
#endif
#ifdef IPX
/*
* XXX - This code is probably wrong
*/
case AF_IPX:
{
register struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
struct arpcom *ac = IFP2AC(ifp);
if (ipx_nullhost(*ina))
ina->x_host =
*(union ipx_host *)
ac->ac_enaddr;
else {
bcopy((caddr_t) ina->x_host.c_host,
(caddr_t) ac->ac_enaddr,
sizeof(ac->ac_enaddr));
}
/*
* Set new address
*/
ifp->if_init(ifp->if_softc);
break;
}
#endif
#ifdef NS
/*
* XXX - This code is probably wrong
*/
case AF_NS:
{
register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
struct arpcom *ac = IFP2AC(ifp);
if (ns_nullhost(*ina))
ina->x_host =
*(union ns_host *) (ac->ac_enaddr);
else {
bcopy((caddr_t) ina->x_host.c_host,
(caddr_t) ac->ac_enaddr,
sizeof(ac->ac_enaddr));
}
/*
* Set new address
*/
ifp->if_init(ifp->if_softc);
break;
}
#endif
default:
ifp->if_init(ifp->if_softc);
break;
}
break;
case SIOCGIFADDR:
{
struct sockaddr *sa;
sa = (struct sockaddr *) & ifr->ifr_data;
bcopy(IFP2AC(ifp)->ac_enaddr,
(caddr_t) sa->sa_data, ETHER_ADDR_LEN);
}
break;
case SIOCSIFMTU:
/*
* Set the interface MTU.
*/
if (ifr->ifr_mtu > ETHERMTU) {
error = EINVAL;
} else {
ifp->if_mtu = ifr->ifr_mtu;
}
break;
default:
error = EINVAL; /* XXX netbsd has ENOTTY??? */
break;
}
return (error);
}
static int
ether_resolvemulti(ifp, llsa, sa)
struct ifnet *ifp;
struct sockaddr **llsa;
struct sockaddr *sa;
{
struct sockaddr_dl *sdl;
struct sockaddr_in *sin;
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif
u_char *e_addr;
switch(sa->sa_family) {
case AF_LINK:
/*
* No mapping needed. Just check that it's a valid MC address.
*/
sdl = (struct sockaddr_dl *)sa;
e_addr = LLADDR(sdl);
if ((e_addr[0] & 1) != 1)
return EADDRNOTAVAIL;
*llsa = 0;
return 0;
#ifdef INET
case AF_INET:
sin = (struct sockaddr_in *)sa;
if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
return EADDRNOTAVAIL;
MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
M_WAITOK|M_ZERO);
sdl->sdl_len = sizeof *sdl;
sdl->sdl_family = AF_LINK;
sdl->sdl_index = ifp->if_index;
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ETHER_ADDR_LEN;
e_addr = LLADDR(sdl);
ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
*llsa = (struct sockaddr *)sdl;
return 0;
#endif
#ifdef INET6
case AF_INET6:
sin6 = (struct sockaddr_in6 *)sa;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
/*
* An IP6 address of 0 means listen to all
* of the Ethernet multicast address used for IP6.
* (This is used for multicast routers.)
*/
ifp->if_flags |= IFF_ALLMULTI;
*llsa = 0;
return 0;
}
if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
return EADDRNOTAVAIL;
MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
M_WAITOK|M_ZERO);
sdl->sdl_len = sizeof *sdl;
sdl->sdl_family = AF_LINK;
sdl->sdl_index = ifp->if_index;
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ETHER_ADDR_LEN;
e_addr = LLADDR(sdl);
ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
*llsa = (struct sockaddr *)sdl;
return 0;
#endif
default:
/*
* Well, the text isn't quite right, but it's the name
* that counts...
*/
return EAFNOSUPPORT;
}
}
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