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NetBSD/sys/net/if_tokensubr.c

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/* $NetBSD: if_tokensubr.c,v 1.81 2017/01/31 17:13:36 maxv Exp $ */
/*
* 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.
*
* from: NetBSD: if_fddisubr.c,v 1.2 1995/08/19 04:35:29 cgd Exp
*/
/*
* Copyright (c) 1997-1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Onno van der Linden.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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) 1995
* Matt Thomas. 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. The names of its contributors may not 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.
*
* from: NetBSD: if_fddisubr.c,v 1.2 1995/08/19 04:35:29 cgd Exp
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_tokensubr.c,v 1.81 2017/01/31 17:13:36 maxv Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_atalk.h"
#include "opt_gateway.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/cpu.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_llatbl.h>
#include <net/if_llc.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/if_ether.h>
#include <net/if_token.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_inarp.h>
#endif
#include "carp.h"
#if NCARP > 0
#include <netinet/ip_carp.h>
#endif
#define senderr(e) { error = (e); goto bad;}
#define RCF_ALLROUTES (2 << 8) | TOKEN_RCF_FRAME2 | TOKEN_RCF_BROADCAST_ALL
#define RCF_SINGLEROUTE (2 << 8) | TOKEN_RCF_FRAME2 | TOKEN_RCF_BROADCAST_SINGLE
static int token_output(struct ifnet *, struct mbuf *,
const struct sockaddr *, const struct rtentry *);
static void token_input(struct ifnet *, struct mbuf *);
/*
* Token Ring output routine.
* Encapsulate a packet of type family for the local net.
* Assumes that ifp is actually pointer to arphdr structure.
* XXX route info has to go into the same mbuf as the header
*/
static int
token_output(struct ifnet *ifp0, struct mbuf *m0, const struct sockaddr *dst,
const struct rtentry *rt)
{
uint16_t etype;
int error = 0;
u_char edst[ISO88025_ADDR_LEN];
struct mbuf *m = m0;
struct mbuf *mcopy = NULL;
struct token_header *trh;
#ifdef INET
struct arphdr *ah = (struct arphdr *)ifp0;
#endif /* INET */
struct token_rif *rif = NULL;
struct token_rif bcastrif;
struct ifnet *ifp = ifp0;
size_t riflen = 0;
#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) {
int s = pserialize_read_enter();
ifa = ifa_ifwithaddr(dst);
if (ifa != NULL &&
ifa->ifa_ifp == ifp0) {
pserialize_read_exit(s);
return (looutput(ifp0, m, dst, rt));
}
pserialize_read_exit(s);
}
ifp = ifp->if_carpdev;
ah = (struct arphdr *)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 the queueing discipline needs packet classification,
* do it before prepending link headers.
*/
IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family);
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
if (m->m_flags & M_BCAST) {
if (ifp->if_flags & IFF_LINK0) {
if (ifp->if_flags & IFF_LINK1)
bcastrif.tr_rcf = htons(RCF_ALLROUTES);
else
bcastrif.tr_rcf = htons(RCF_SINGLEROUTE);
rif = &bcastrif;
riflen = sizeof(rif->tr_rcf);
}
memcpy(edst, tokenbroadcastaddr, sizeof(edst));
}
/*
* XXX m->m_flags & M_MCAST IEEE802_MAP_IP_MULTICAST ??
*/
else {
struct llentry *la;
error = arpresolve(ifp, rt, m, dst, edst, sizeof(edst));
if (error != 0)
return error == EWOULDBLOCK ? 0 : error;
la = rt->rt_llinfo;
KASSERT(la != NULL);
TOKEN_RIF_LLE_ASSERT(la);
rif = TOKEN_RIF_LLE(la);
riflen = (ntohs(rif->tr_rcf) & TOKEN_RCF_LEN_MASK) >> 8;
}
/* 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:
/*
* XXX source routing, assume m->m_data contains the useful stuff
*/
ah = mtod(m, struct arphdr *);
ah->ar_hrd = htons(ARPHRD_IEEE802);
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);
}
if (m->m_flags & M_BCAST) {
if (ifp->if_flags & IFF_LINK0) {
if (ifp->if_flags & IFF_LINK1)
bcastrif.tr_rcf = htons(RCF_ALLROUTES);
else
bcastrif.tr_rcf = htons(RCF_SINGLEROUTE);
rif = &bcastrif;
riflen = sizeof(rif->tr_rcf);
}
memcpy(edst, tokenbroadcastaddr, sizeof(edst));
}
else {
void *tha = ar_tha(ah);
if (tha == NULL) {
m_freem(m);
return 0;
}
memcpy(edst, tha, sizeof(edst));
trh = (struct token_header *)M_TRHSTART(m);
trh->token_ac = TOKEN_AC;
trh->token_fc = TOKEN_FC;
if (trh->token_shost[0] & TOKEN_RI_PRESENT) {
struct token_rif *trrif;
trrif = TOKEN_RIF(trh);
riflen = (ntohs(trrif->tr_rcf) & TOKEN_RCF_LEN_MASK) >> 8;
}
memcpy((void *)trh->token_dhost, (void *)edst,
sizeof (edst));
memcpy((void *)trh->token_shost, CLLADDR(ifp->if_sadl),
sizeof(trh->token_shost));
if (riflen != 0)
trh->token_shost[0] |= TOKEN_RI_PRESENT;
/*
* compare (m->m_data - m->m_pktdat) with (sizeof(struct token_header) + riflen + ...
*/
m->m_len += (sizeof(*trh) + riflen + LLC_SNAPFRAMELEN);
m->m_data -= (sizeof(*trh) + riflen + LLC_SNAPFRAMELEN);
m->m_pkthdr.len += (sizeof(*trh) + riflen + LLC_SNAPFRAMELEN);
goto send;
}
break;
#endif
case AF_UNSPEC:
{
const struct ether_header *eh;
eh = (const struct ether_header *)dst->sa_data;
memcpy(edst, eh->ether_dhost, sizeof(edst));
if (*edst & 1)
m->m_flags |= (M_BCAST|M_MCAST);
etype = eh->ether_type;
if (m->m_flags & M_BCAST) {
if (ifp->if_flags & IFF_LINK0) {
if (ifp->if_flags & IFF_LINK1)
bcastrif.tr_rcf = htons(RCF_ALLROUTES);
else
bcastrif.tr_rcf = htons(RCF_SINGLEROUTE);
rif = &bcastrif;
riflen = sizeof(bcastrif.tr_rcf);
}
}
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 (etype != 0) {
struct llc *l;
M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
l = mtod(m, struct llc *);
l->llc_control = LLC_UI;
l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
l->llc_snap.org_code[0] = l->llc_snap.org_code[1] =
l->llc_snap.org_code[2] = 0;
memcpy((void *) &l->llc_snap.ether_type, (void *) &etype,
sizeof(uint16_t));
}
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, (riflen + sizeof (*trh)), M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
trh = mtod(m, struct token_header *);
trh->token_ac = TOKEN_AC;
trh->token_fc = TOKEN_FC;
memcpy((void *)trh->token_dhost, (void *)edst, sizeof (edst));
memcpy((void *)trh->token_shost, CLLADDR(ifp->if_sadl),
sizeof(trh->token_shost));
if (riflen != 0) {
struct token_rif *trrif;
trh->token_shost[0] |= TOKEN_RI_PRESENT;
trrif = TOKEN_RIF(trh);
memcpy(trrif, rif, riflen);
}
#ifdef INET
send:
#endif
#if NCARP > 0
if (ifp0 != ifp && ifp0->if_type == IFT_CARP) {
memcpy((void *)trh->token_shost, CLLADDR(ifp0->if_sadl),
sizeof(trh->token_shost));
}
#endif /* NCARP > 0 */
return ifq_enqueue(ifp, m);
bad:
if (m)
m_freem(m);
return (error);
}
/*
* Process a received token ring packet;
* the packet is in the mbuf chain m with
* the token ring header.
*/
static void
token_input(struct ifnet *ifp, struct mbuf *m)
{
pktqueue_t *pktq = NULL;
struct ifqueue *inq = NULL;
struct llc *l;
struct token_header *trh;
int lan_hdr_len;
int isr = 0;
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
trh = mtod(m, struct token_header *);
ifp->if_ibytes += m->m_pkthdr.len;
if (memcmp(tokenbroadcastaddr, trh->token_dhost,
sizeof(tokenbroadcastaddr)) == 0)
m->m_flags |= M_BCAST;
else if (trh->token_dhost[0] & 1)
m->m_flags |= M_MCAST;
if (m->m_flags & (M_BCAST|M_MCAST))
ifp->if_imcasts++;
/* Skip past the Token Ring header and RIF. */
lan_hdr_len = sizeof(struct token_header);
if (trh->token_shost[0] & TOKEN_RI_PRESENT) {
struct token_rif *trrif;
trrif = TOKEN_RIF(trh);
lan_hdr_len += (ntohs(trrif->tr_rcf) & TOKEN_RCF_LEN_MASK) >> 8;
}
l = (struct llc *)(mtod(m, uint8_t *) + lan_hdr_len);
switch (l->llc_dsap) {
#if defined(INET)
case LLC_SNAP_LSAP:
{
uint16_t etype;
if (l->llc_control != LLC_UI || l->llc_ssap != LLC_SNAP_LSAP)
goto dropanyway;
if (l->llc_snap.org_code[0] != 0 ||
l->llc_snap.org_code[1] != 0 ||
l->llc_snap.org_code[2] != 0)
goto dropanyway;
etype = ntohs(l->llc_snap.ether_type);
m_adj(m, lan_hdr_len + LLC_SNAPFRAMELEN);
#if NCARP > 0
if (ifp->if_carp && ifp->if_type != IFT_CARP &&
(carp_input(m, (uint8_t *)&trh->token_shost,
(uint8_t *)&trh->token_dhost, l->llc_snap.ether_type) == 0))
return;
#endif /* NCARP > 0 */
switch (etype) {
#ifdef INET
case ETHERTYPE_IP:
pktq = ip_pktq;
break;
case ETHERTYPE_ARP:
isr = NETISR_ARP;
inq = &arpintrq;
break;
#endif
default:
/*
printf("token_input: unknown protocol 0x%x\n", etype);
*/
ifp->if_noproto++;
goto dropanyway;
}
break;
}
#endif /* INET */
default:
/* printf("token_input: unknown dsap 0x%x\n", l->llc_dsap); */
ifp->if_noproto++;
#if defined(INET)
dropanyway:
#endif
m_freem(m);
return;
}
if (__predict_true(pktq)) {
if (__predict_false(!pktq_enqueue(pktq, m, 0))) {
m_freem(m);
}
return;
}
IFQ_LOCK(inq);
if (IF_QFULL(inq)) {
IF_DROP(inq);
IFQ_UNLOCK(inq);
m_freem(m);
} else {
IF_ENQUEUE(inq, m);
IFQ_UNLOCK(inq);
schednetisr(isr);
}
}
/*
* Perform common duties while attaching to interface list
*/
void
token_ifattach(struct ifnet *ifp, void *lla)
{
ifp->if_type = IFT_ISO88025;
ifp->if_hdrlen = 14;
ifp->if_dlt = DLT_IEEE802;
ifp->if_mtu = ISO88025_MTU;
ifp->if_output = token_output;
ifp->_if_input = token_input;
ifp->if_broadcastaddr = tokenbroadcastaddr;
#ifdef IFF_NOTRAILERS
ifp->if_flags |= IFF_NOTRAILERS;
#endif
if_set_sadl(ifp, lla, ISO88025_ADDR_LEN, true);
bpf_attach(ifp, DLT_IEEE802, sizeof(struct token_header));
}
void
token_ifdetach(struct ifnet *ifp)
{
bpf_detach(ifp);
}
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