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freebsd-nq/sys/net/if_ethersubr.c
Julian Elischer ecf33d87b2 YUCK! 
m_prepend doesn't fix m_pkthdr.len, use M_PREPEND instead, which does..
(Netgraph only)
1999-11-15 03:49:35 +00:00

1246 lines
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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_ipx.h"
#include "opt_bdg.h"
#include "opt_netgraph.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.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>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#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 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 */
#ifdef BRIDGE
#include <net/bridge.h>
#endif
#include "vlan.h"
#if NVLAN > 0
#include <net/if_vlan_var.h>
#endif /* NVLAN > 0 */
static int ether_resolvemulti __P((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)
#ifdef NETGRAPH
#include <netgraph/ng_ether.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
static void ngether_init(void* ignored);
static void ngether_send(struct arpcom *ac,
struct ether_header *eh, struct mbuf *m);
static ng_constructor_t ngether_constructor;
static ng_rcvmsg_t ngether_rcvmsg;
static ng_shutdown_t ngether_rmnode;
static ng_newhook_t ngether_newhook;
static ng_connect_t ngether_connect;
static ng_rcvdata_t ngether_rcvdata;
static ng_disconnect_t ngether_disconnect;
static struct ng_type typestruct = {
NG_VERSION,
NG_ETHER_NODE_TYPE,
NULL,
ngether_constructor,
ngether_rcvmsg,
ngether_rmnode,
ngether_newhook,
NULL,
ngether_connect,
ngether_rcvdata,
ngether_rcvdata,
ngether_disconnect
};
#define AC2NG(AC) ((node_p)((AC)->ac_ng))
#define NGEF_DIVERT NGF_TYPE1 /* all packets sent to netgraph */
#endif /* NETGRAPH */
/*
* 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, hdrcmplt = 0;
u_char esrc[6], edst[6];
register struct mbuf *m = m0;
register struct rtentry *rt;
register struct ether_header *eh;
int off, len = m->m_pkthdr.len, loop_copy = 0;
int hlen; /* link layer header lenght */
struct arpcom *ac = IFP2AC(ifp);
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(ac, rt, m, dst, edst, rt0))
return (0); /* if not yet resolved */
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));
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_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);
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_WAIT);
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;
schednetisr(NETISR_NS);
inq = &nsintrq;
s = splimp();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
return (error);
}
if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){
m->m_flags |= M_BCAST;
}
break;
#endif /* NS */
#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);
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 (*edst & 1)
loop_copy = 1;
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 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:
printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
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)) {
if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
(void) if_simloop(ifp, n, dst, hlen);
} else if (bcmp(eh->ether_dhost,
eh->ether_shost, ETHER_ADDR_LEN) == 0) {
(void) if_simloop(ifp, m, dst, hlen);
return (0); /* XXX */
}
}
#ifdef BRIDGE
if (do_bridge) {
struct mbuf *m0 = m ;
if (m->m_pkthdr.rcvif)
m->m_pkthdr.rcvif = NULL ;
ifp = bridge_dst_lookup(m);
bdg_forward(&m0, ifp);
if (m0)
m_freem(m0);
return (0);
}
#endif
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 (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++;
ether_type = ntohs(eh->ether_type);
#ifdef NETGRAPH
{
struct arpcom *ac = IFP2AC(ifp);
if (AC2NG(ac) && (AC2NG(ac)->flags & NGEF_DIVERT)) {
ngether_send(ac, eh, m);
return;
}
}
#endif /* NETGRAPH */
#if NVLAN > 0
if (ether_type == vlan_proto) {
if (vlan_input(eh, m) < 0)
ifp->if_data.ifi_noproto++;
return;
}
#endif /* NVLAN > 0 */
switch (ether_type) {
#ifdef INET
case ETHERTYPE_IP:
if (ipflow_fastforward(m))
return;
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 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 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 (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(IFP2AC(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:
#ifdef NETGRAPH
ngether_send(IFP2AC(ifp), eh, m);
#else /* NETGRAPH */
m_freem(m);
#endif /* NETGRAPH */
return;
}
#else /* ISO || LLC || NETATALK */
#ifdef NETGRAPH
ngether_send(IFP2AC(ifp), eh, m);
#else /* NETGRAPH */
m_freem(m);
#endif /* NETGRAPH */
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;
ifp->if_resolvemulti = ether_resolvemulti;
if (ifp->if_baudrate == 0)
ifp->if_baudrate = 10000000;
ifa = ifnet_addrs[ifp->if_index - 1];
if (ifa == 0) {
printf("ether_ifattach: no lladdr!\n");
return;
}
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ifp->if_addrlen;
bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
#ifdef NETGRAPH
ngether_init(ifp);
#endif /* NETGRAPH */
}
SYSCTL_DECL(_net_link);
SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
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(IFP2AC(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;
}
return (error);
}
int
ether_resolvemulti(ifp, llsa, sa)
struct ifnet *ifp;
struct sockaddr **llsa;
struct sockaddr *sa;
{
struct sockaddr_dl *sdl;
struct sockaddr_in *sin;
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);
sdl->sdl_len = sizeof *sdl;
sdl->sdl_family = AF_LINK;
sdl->sdl_index = ifp->if_index;
sdl->sdl_type = IFT_ETHER;
sdl->sdl_nlen = 0;
sdl->sdl_alen = ETHER_ADDR_LEN;
sdl->sdl_slen = 0;
e_addr = LLADDR(sdl);
ETHER_MAP_IP_MULTICAST(&sin->sin_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;
}
}
#ifdef NETGRAPH
/***********************************************************************
* This section contains the methods for the Netgraph interface
***********************************************************************/
/* It's Ascii-art time!
* The ifnet is the first part of the arpcom which must be
* the first part of the device's softc.. yuk.
*
* +--------------------------+-----+---------+
* | struct ifnet (*ifp) | | |
* | | | |
* +--------------------------+ | |
* +--|[ac_ng] struct arpcom (*ac) | |
* | +--------------------------------+ |
* | | struct softc (*ifp->if_softc) (device) |
* | +------------------------------------------+
* | ^
* AC2NG() |
* | v
* | +----------------------+
* | | [private] [flags] |
* +------>| struct ng_node |
* | [hooks] | ** we only allow one hook
* +----------------------+
* ^
* |
* v
* +-------------+
* | [node] |
* | hook |
* | [private]|-- *unused*
* +-------------+
*/
/*
* called during interface attaching
*/
static void
ngether_init(void *ifpvoid)
{
struct ifnet *ifp = ifpvoid;
struct arpcom *ac = IFP2AC(ifp);
static int ngether_done_init;
char namebuf[32];
node_p node;
/*
* we have found a node, make sure our 'type' is availabe.
*/
if (ngether_done_init == 0) {
if (ng_newtype(&typestruct)) {
printf("ngether install failed\n");
return;
}
ngether_done_init = 1;
}
if (ng_make_node_common(&typestruct, &node) != 0)
return;
ac->ac_ng = node;
node->private = ifp;
sprintf(namebuf, "%s%d", ifp->if_name, ifp->if_unit);
ng_name_node(AC2NG(ac), namebuf);
}
/*
* It is not possible or allowable to create a node of this type.
* If the hardware exists, it will already have created it.
*/
static int
ngether_constructor(node_p *nodep)
{
return (EINVAL);
}
/*
* Give our ok for a hook to be added...
*
* Allow one hook at a time (rawdata).
* It can eiteh rdivert everything or only unclaimed packets.
*/
static int
ngether_newhook(node_p node, hook_p hook, const char *name)
{
/* check if there is already a hook */
if (LIST_FIRST(&(node->hooks)))
return(EISCONN);
/*
* Check for which mode hook we want.
*/
if (strcmp(name, NG_ETHER_HOOK_ORPHAN) != 0) {
if (strcmp(name, NG_ETHER_HOOK_DIVERT) != 0) {
return (EINVAL);
}
node->flags |= NGEF_DIVERT;
} else {
node->flags &= ~NGEF_DIVERT;
}
return (0);
}
/*
* incoming messages.
* Just respond to the generic TEXT_STATUS message
*/
static int
ngether_rcvmsg(node_p node,
struct ng_mesg *msg, const char *retaddr, struct ng_mesg **resp)
{
struct ifnet *ifp;
int error = 0;
ifp = node->private;
switch (msg->header.typecookie) {
case NGM_ETHER_COOKIE:
error = EINVAL;
break;
case NGM_GENERIC_COOKIE:
switch(msg->header.cmd) {
case NGM_TEXT_STATUS: {
char *arg;
int pos = 0;
int resplen = sizeof(struct ng_mesg) + 512;
MALLOC(*resp, struct ng_mesg *, resplen,
M_NETGRAPH, M_NOWAIT);
if (*resp == NULL) {
error = ENOMEM;
break;
}
bzero(*resp, resplen);
arg = (*resp)->data;
/*
* Put in the throughput information.
*/
pos = sprintf(arg, "%ld bytes in, %ld bytes out\n",
ifp->if_ibytes, ifp->if_obytes);
pos += sprintf(arg + pos,
"%ld output errors\n",
ifp->if_oerrors);
pos += sprintf(arg + pos,
"ierrors = %ld\n",
ifp->if_ierrors);
(*resp)->header.version = NG_VERSION;
(*resp)->header.arglen = strlen(arg) + 1;
(*resp)->header.token = msg->header.token;
(*resp)->header.typecookie = NGM_ETHER_COOKIE;
(*resp)->header.cmd = msg->header.cmd;
strncpy((*resp)->header.cmdstr, "status",
NG_CMDSTRLEN);
}
break;
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
free(msg, M_NETGRAPH);
return (error);
}
/*
* Receive a completed ethernet packet.
* Queue it for output.
*/
static int
ngether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
{
struct ifnet *ifp;
int error = 0;
int s;
struct ether_header *eh;
ifp = hook->node->private;
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
/* drop in the MAC address */
eh = mtod(m, struct ether_header *);
bcopy(IFP2AC(ifp)->ac_enaddr, eh->ether_shost, 6);
/*
* 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) {
if (m->m_flags & M_BCAST) {
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
ng_queue_data(hook, n, meta);
} else if (bcmp(eh->ether_dhost,
eh->ether_shost, ETHER_ADDR_LEN) == 0) {
ng_queue_data(hook, m, meta);
return (0); /* XXX */
}
}
s = splimp();
/*
* Queue message on interface, and start output if interface
* not yet active.
* XXX if we lookead at the priority in the meta data we could
* queue high priority items at the head.
*/
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 += m->m_pkthdr.len;
if (m->m_flags & M_MCAST)
ifp->if_omcasts++;
return (error);
bad:
NG_FREE_DATA(m, meta);
return (error);
}
/*
* pass an mbuf out to the connected hook
* More complicated than just an m_prepend, as it tries to save later nodes
* from needing to do lots of m_pullups.
*/
static void
ngether_send(struct arpcom *ac, struct ether_header *eh, struct mbuf *m)
{
int room;
node_p node = AC2NG(ac);
struct ether_header *eh2;
if (node && LIST_FIRST(&(node->hooks))) {
/*
* Possibly the header is already on the front,
*/
eh2 = mtod(m, struct ether_header *) - 1;
if ( eh == eh2) {
/*
* This is the case so just move the markers back to
* re-include it. We lucked out.
* This allows us to avoid a yucky m_pullup
* in later nodes if it works.
*/
m->m_len += sizeof(*eh);
m->m_data -= sizeof(*eh);
m->m_pkthdr.len += sizeof(*eh);
} else {
/*
* Alternatively there may be room even though
* it is stored somewhere else. If so, copy it in.
* This only safe because we KNOW that this packet has
* just been generated by an ethernet card, so there
* are no aliases to the buffer. (unlike in outgoing
* packets).
* Nearly all ethernet cards will end up producing mbufs
* that fall into these cases. So we are not optimising
* contorted cases.
*/
if (m->m_flags & M_EXT) {
room = (mtod(m, caddr_t) - m->m_ext.ext_buf);
if (room > m->m_ext.ext_size) /* garbage */
room = 0; /* fail immediatly */
} else {
room = (mtod(m, caddr_t) - m->m_pktdat);
}
if (room > sizeof (*eh)) {
/* we have room, just copy it and adjust */
m->m_len += sizeof(*eh);
m->m_data -= sizeof(*eh);
m->m_pkthdr.len += sizeof(*eh);
} else {
/*
* Doing anything more is likely to get more
* expensive than it's worth..
* it's probable that everything else is in one
* big lump. The next node will do an m_pullup()
* for exactly the amount of data it needs and
* hopefully everything after that will not
* need one. So let's just use M_PREPEND.
*/
M_PREPEND(m, sizeof (*eh), M_DONTWAIT);
if (m == NULL)
return;
}
bcopy ((caddr_t)eh, mtod(m, struct ether_header *),
sizeof(*eh));
}
ng_queue_data(LIST_FIRST(&(node->hooks)), m, NULL);
} else {
m_freem(m);
}
}
/*
* do local shutdown processing..
* This node will refuse to go away, unless the hardware says to..
* don't unref the node, or remove our name. just clear our links up.
*/
static int
ngether_rmnode(node_p node)
{
ng_cutlinks(node);
node->flags &= ~NG_INVALID; /* bounce back to life */
return (0);
}
/* already linked */
static int
ngether_connect(hook_p hook)
{
/* be really amiable and just say "YUP that's OK by me! " */
return (0);
}
/*
* notify on hook disconnection (destruction)
*
* For this type, removal of the last lins no effect. The interface can run
* independently.
* Since we have no per-hook information, this is rather simple.
*/
static int
ngether_disconnect(hook_p hook)
{
hook->node->flags &= ~NGEF_DIVERT;
return (0);
}
#endif /* NETGRAPH */
/********************************** END *************************************/
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