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/* $NetBSD: if_ecosubr.c,v 1.8 2001/09/17 22:42:00 bjh21 Exp $ */
/*-
* Copyright (c) 2001 Ben Harris
* 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 name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "bpfilter.h"
#include "opt_inet.h"
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: if_ecosubr.c,v 1.8 2001/09/17 22:42:00 bjh21 Exp $");
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_eco.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#ifdef INET
#include <net/ethertypes.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#endif
#define ECO_MAUX_RETRYPARMS 0
struct eco_retryparms {
int erp_delay;
int erp_count;
};
/* Default broadcast address */
static const u_int8_t eco_broadcastaddr[] = { 0xff, 0xff };
static int eco_output(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
static void eco_input(struct ifnet *, struct mbuf *);
static void eco_start(struct ifnet *);
static int eco_ioctl(struct ifnet *, u_long, caddr_t);
static int eco_interestingp(struct ifnet *ifp, struct mbuf *m);
static struct mbuf *eco_immediate(struct ifnet *ifp, struct mbuf *m);
static struct mbuf *eco_ack(struct ifnet *ifp, struct mbuf *m);
static void eco_defer(struct ifnet *, struct mbuf *, int);
static void eco_retry_free(struct eco_retry *er);
static void eco_retry(void *);
void
eco_ifattach(struct ifnet *ifp, const u_int8_t *lla)
{
struct ecocom *ec = (void *)ifp;
ifp->if_type = IFT_OTHER;
ifp->if_addrlen = ECO_ADDR_LEN;
ifp->if_hdrlen = ECO_HDR_LEN;
ifp->if_dlt = DLT_ECONET;
ifp->if_mtu = ECO_MTU;
ifp->if_output = eco_output;
ifp->if_input = eco_input;
ifp->if_start = eco_start;
ifp->if_ioctl = eco_ioctl;
/* ifp->if_baudrate...; */
if_alloc_sadl(ifp);
memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen);
/* XXX cast safe? */
ifp->if_broadcastaddr = (u_int8_t *)eco_broadcastaddr;
LIST_INIT(&ec->ec_retries);
#if NBPFILTER > 0
bpfattach(ifp, ifp->if_dlt, ECO_HDR_LEN);
#endif
}
#define senderr(e) do { \
error = (e); \
goto bad; \
} while (/*CONSTCOND*/0)
int
eco_init(struct ifnet *ifp) {
struct ecocom *ec = (struct ecocom *)ifp;
if ((ifp->if_flags & IFF_RUNNING) == 0)
ec->ec_state = ECO_UNKNOWN;
return 0;
}
void
eco_stop(struct ifnet *ifp, int disable)
{
struct ecocom *ec = (struct ecocom *)ifp;
while (!LIST_EMPTY(&ec->ec_retries))
eco_retry_free(LIST_FIRST(&ec->ec_retries));
}
static int
eco_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
struct rtentry *rt0)
{
struct eco_header ehdr, *eh;
int error, s;
struct mbuf *m = m0, *mcopy = NULL;
struct rtentry *rt;
int hdrcmplt;
size_t len;
int delay, count;
struct mbuf *maux;
struct eco_retryparms *erp;
#ifdef INET
struct mbuf *m1;
struct arphdr *ah;
struct eco_arp *ecah;
#endif
ALTQ_DECL(struct altq_pktattr pktattr;)
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 ||
time.tv_sec < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
/*
* If the queueing discipline needs packet classification,
* do it before prepending link headers.
*/
IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr);
hdrcmplt = 0;
delay = hz / 16;
count = 16;
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
if (m->m_flags & M_BCAST)
memcpy(ehdr.eco_dhost, eco_broadcastaddr,
ECO_ADDR_LEN);
else if (!arpresolve(ifp, rt, m, dst, ehdr.eco_dhost))
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);
ehdr.eco_port = ECO_PORT_IP;
ehdr.eco_control = ECO_CTL_IP;
break;
case AF_ARP:
ah = mtod(m, struct arphdr *);
if (ntohs(ah->ar_pro) != ETHERTYPE_IP)
return EAFNOSUPPORT;
ehdr.eco_port = ECO_PORT_IP;
switch (ntohs(ah->ar_op)) {
case ARPOP_REQUEST:
ehdr.eco_control = ECO_CTL_ARP_REQUEST;
break;
case ARPOP_REPLY:
ehdr.eco_control = ECO_CTL_ARP_REPLY;
break;
default:
return EOPNOTSUPP;
}
if (m->m_flags & M_BCAST)
memcpy(ehdr.eco_dhost, eco_broadcastaddr,
ECO_ADDR_LEN);
else
memcpy(ehdr.eco_dhost, ar_tha(ah), ECO_ADDR_LEN);
MGETHDR(m1, M_DONTWAIT, MT_DATA);
if (m1 == NULL)
senderr(ENOBUFS);
M_COPY_PKTHDR(m1, m);
m1->m_len = sizeof(*ecah);
m1->m_pkthdr.len = m1->m_len;
MH_ALIGN(m1, m1->m_len);
ecah = mtod(m1, struct eco_arp *);
memset(ecah, 0, m1->m_len);
memcpy(ecah->ecar_spa, ar_spa(ah), ah->ar_pln);
memcpy(ecah->ecar_tpa, ar_tpa(ah), ah->ar_pln);
m_freem(m);
m = m1;
break;
#endif
case pseudo_AF_HDRCMPLT:
hdrcmplt = 1;
/* FALLTHROUGH */
case AF_UNSPEC:
eh = (struct eco_header *)dst->sa_data;
ehdr = *eh;
break;
default:
log(LOG_ERR, "%s: can't handle af%d\n", ifp->if_xname,
dst->sa_family);
senderr(EAFNOSUPPORT);
}
if (mcopy)
(void) looutput(ifp, mcopy, dst, rt);
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, sizeof (struct eco_header), M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
eh = mtod(m, struct eco_header *);
*eh = ehdr;
if (!hdrcmplt)
memcpy(eh->eco_shost, LLADDR(ifp->if_sadl),
ECO_ADDR_LEN);
if ((m->m_flags & M_BCAST) == 0) {
/* Attach retry info to packet. */
maux = m_aux_add(m, AF_LINK, ECO_MAUX_RETRYPARMS);
if (maux == NULL)
senderr(ENOBUFS);
erp = mtod(maux, struct eco_retryparms *);
erp->erp_delay = delay;
erp->erp_count = count;
maux->m_len = sizeof(struct eco_retryparms);
}
#ifdef PFIL_HOOKS
if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0)
return (error);
if (m == NULL)
return (0);
#endif
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
len = m->m_pkthdr.len;
s = splnet();
IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error);
if (error) {
splx(s);
return (error);
}
ifp->if_obytes += len;
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
return (error);
bad:
if (m)
m_freem(m);
return error;
}
/*
* Given a scout, decide if we want the rest of the packet.
*/
static int
eco_interestingp(struct ifnet *ifp, struct mbuf *m)
{
struct eco_header *eh;
eh = mtod(m, struct eco_header *);
switch (eh->eco_port) {
#ifdef INET
case ECO_PORT_IP:
return 1;
#endif
}
return 0;
}
static void
eco_input(struct ifnet *ifp, struct mbuf *m)
{
struct ifqueue *inq;
struct eco_header ehdr, *eh;
int s, i;
#ifdef INET
struct arphdr *ah;
struct eco_arp *ecah;
struct mbuf *m1;
#endif
#ifdef PFIL_HOOKS
if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0)
return;
if (m == NULL)
return;
#endif
/* Copy the mbuf header and trim it off. */
/* XXX use m_split? */
eh = &ehdr;
m_copydata(m, 0, ECO_HDR_LEN, (caddr_t)eh);
m_adj(m, ECO_HDR_LEN);
switch (eh->eco_port) {
#ifdef INET
case ECO_PORT_IP:
switch (eh->eco_control) {
case ECO_CTL_IP:
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
case ECO_CTL_ARP_REQUEST:
case ECO_CTL_ARP_REPLY:
/*
* ARP over Econet is strange, because Econet only
* supports 8 bytes of data in a broadcast packet.
* To cope with this, only the source and destination
* IP addresses are actually contained in the packet
* and we have to infer the rest and build a fake ARP
* packet to pass upwards.
*/
if (m->m_pkthdr.len != sizeof(struct eco_arp))
goto drop;
if (m->m_len < sizeof(struct eco_arp)) {
m = m_pullup(m, sizeof(struct eco_arp));
if (m == NULL) goto drop;
}
ecah = mtod(m, struct eco_arp *);
/* This code derived from arprequest() */
MGETHDR(m1, M_DONTWAIT, MT_DATA);
if (m1 == NULL)
goto drop;
M_COPY_PKTHDR(m1, m);
m1->m_len = sizeof(*ah) + 2*sizeof(struct in_addr) +
2*ifp->if_data.ifi_addrlen;
m1->m_pkthdr.len = m1->m_len;
MH_ALIGN(m1, m1->m_len);
ah = mtod(m1, struct arphdr *);
bzero((caddr_t)ah, m1->m_len);
ah->ar_pro = htons(ETHERTYPE_IP);
ah->ar_hln = ifp->if_data.ifi_addrlen;
ah->ar_pln = sizeof(struct in_addr);
if (eh->eco_control == ECO_CTL_ARP_REQUEST)
ah->ar_op = htons(ARPOP_REQUEST);
else
ah->ar_op = htons(ARPOP_REPLY);
memcpy(ar_sha(ah), eh->eco_shost, ah->ar_hln);
memcpy(ar_tha(ah), eh->eco_dhost, ah->ar_hln);
memcpy(ar_spa(ah), ecah->ecar_spa, ah->ar_pln);
memcpy(ar_tpa(ah), ecah->ecar_tpa, ah->ar_pln);
m_freem(m);
m = m1;
schednetisr(NETISR_ARP);
inq = &arpintrq;
break;
case ECO_CTL_IPBCAST_REQUEST:
{
struct sockaddr_storage dst_store;
struct sockaddr *dst = (struct sockaddr *)&dst_store;
/* Queue? */
memcpy(eh->eco_dhost, eh->eco_shost, ECO_ADDR_LEN);
eh->eco_control = ECO_CTL_IPBCAST_REPLY;
/* dst->sa_len??? */
dst->sa_family = AF_UNSPEC;
memcpy(dst->sa_data, eh, ECO_HDR_LEN);
ifp->if_output(ifp, m, dst, NULL);
return;
}
default:
printf("%s: unknown IP stn %s ctl 0x%02x len %d:",
ifp->if_xname, eco_sprintf(eh->eco_shost),
eh->eco_control, m->m_pkthdr.len);
if (m->m_len == 0) {
m = m_pullup(m, 1);
if (m == 0) {
printf("\n");
goto drop;
}
}
for (i = 0; i < m->m_len; i++)
printf(" %02x", mtod(m, u_int8_t *)[i]);
printf("\n");
goto drop;
}
break;
#endif
default:
printf("%s: unknown port stn %s port 0x%02x ctl 0x%02x\n",
ifp->if_xname, eco_sprintf(eh->eco_shost),
eh->eco_port, eh->eco_control);
drop:
m_freem(m);
return;
}
s = splnet();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
}
static void
eco_start(struct ifnet *ifp)
{
struct ecocom *ec = (void *)ifp;
struct mbuf *m;
struct eco_header *eh;
if (ec->ec_state != ECO_IDLE) return;
IFQ_DEQUEUE(&ifp->if_snd, m);
if (m == NULL) return;
if (ec->ec_claimwire(ifp) == 0) {
eh = mtod(m, struct eco_header *);
if (eh->eco_port == ECO_PORT_IMMEDIATE) {
ec->ec_txframe(ifp, m);
ec->ec_state = ECO_IMMED_SENT;
} else if (eh->eco_dhost[0] == 255) {
ec->ec_txframe(ifp, m);
ec->ec_state = ECO_DONE;
} else {
ec->ec_packet = m;
m = m_copym(m, 0, ECO_HDR_LEN, M_DONTWAIT);
/* m_copym moves the aux ptr. Move it back. */
ec->ec_packet->m_pkthdr.aux = m->m_pkthdr.aux;
m->m_pkthdr.aux = NULL;
if (m == NULL) {
m_freem(ec->ec_packet);
ec->ec_packet = NULL;
return;
}
ec->ec_txframe(ifp, m);
ec->ec_state = ECO_SCOUT_SENT;
}
ifp->if_flags |= IFF_OACTIVE;
} else {
log(LOG_ERR, "%s: line jammed\n", ifp->if_xname);
m_freem(m);
}
}
static int
eco_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
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) {
#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
default:
if ((ifp->if_flags & IFF_RUNNING) == 0)
error = (*ifp->if_init)(ifp);
break;
}
break;
case SIOCSIFMTU:
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;
default:
error = ENOTTY;
}
return error;
}
/*
* Handle a raw Econet frame off the interface. The interface may be
* flag-filling for a response.
*
* May be called from IPL_NET or IPL_SOFTNET.
*/
struct mbuf *
eco_inputframe(struct ifnet *ifp, struct mbuf *m)
{
struct ecocom *ec = (void *)ifp;
struct eco_header *eh, *eh0;
struct mbuf *m0;
struct mbuf *reply;
int len;
eh = mtod(m, struct eco_header *);
switch (ec->ec_state) {
case ECO_IDLE: /* Start of a packet (bcast, immed, scout) */
if (m->m_pkthdr.len < ECO_HDR_LEN) {
log(LOG_NOTICE, "%s: undersize scout\n",
ifp->if_xname);
goto drop;
}
if (memcmp(eh->eco_dhost, eco_broadcastaddr,
ECO_ADDR_LEN) == 0) {
/* Broadcast */
eco_input(ifp, m);
} else if (memcmp(eh->eco_dhost, LLADDR(ifp->if_sadl),
ECO_ADDR_LEN) == 0) {
/* Unicast for us */
if (eh->eco_port == ECO_PORT_IMMEDIATE)
return eco_immediate(ifp, m);
else {
if (eco_interestingp(ifp, m)) {
reply = eco_ack(ifp, m);
if (reply == NULL) {
m_freem(m);
return NULL;
}
ec->ec_state = ECO_SCOUT_RCVD;
ec->ec_scout = m;
return reply;
} else {
m_freem(m);
return NULL;
}
}
} else
/* Not for us. Throw it away. */
m_freem(m);
break;
case ECO_SCOUT_RCVD: /* Packet data */
KASSERT(ec->ec_scout != NULL);
m0 = ec->ec_scout;
eh0 = mtod(m0, struct eco_header *);
if (m->m_pkthdr.len < ECO_SHDR_LEN ||
memcmp(eh->eco_shost, eh0->eco_shost, ECO_ADDR_LEN) != 0 ||
memcmp(eh->eco_dhost, eh0->eco_dhost, ECO_ADDR_LEN) != 0) {
log(LOG_NOTICE, "%s: garbled data packet header\n",
ifp->if_xname);
goto drop;
}
reply = eco_ack(ifp, m);
/*
* Chop off the small header from this frame, and put
* the scout (which holds the control byte and port)
* in its place.
*/
ec->ec_scout = NULL;
m_adj(m, ECO_SHDR_LEN);
len = m0->m_pkthdr.len + m->m_pkthdr.len;
m_cat(m0, m);
m0->m_pkthdr.len = len;
ec->ec_state = ECO_DONE;
eco_input(ifp, m0);
return reply;
case ECO_SCOUT_SENT: /* Scout ack */
KASSERT(ec->ec_packet != NULL);
m0 = ec->ec_packet;
eh0 = mtod(m0, struct eco_header *);
if (m->m_pkthdr.len != ECO_SHDR_LEN ||
memcmp(eh->eco_shost, eh0->eco_dhost, ECO_ADDR_LEN) != 0 ||
memcmp(eh->eco_dhost, eh0->eco_shost, ECO_ADDR_LEN) != 0) {
log(LOG_NOTICE, "%s: garbled scout ack\n",
ifp->if_xname);
goto drop;
}
m_freem(m);
/* Chop out the control and port bytes. */
m0 = m_copym(ec->ec_packet, 0, ECO_SHDR_LEN, M_DONTWAIT);
/* Put the aux ptr back where it belongs. */
ec->ec_packet->m_pkthdr.aux = m0->m_pkthdr.aux;
m0->m_pkthdr.aux = NULL;
if (m0 == NULL) {
m_freem(ec->ec_packet);
return NULL;
}
/* m_copypacket moves the aux ptr, hence this little dance. */
m = ec->ec_packet;
ec->ec_packet = m_copypacket(m, M_DONTWAIT);
if (ec->ec_packet == NULL) {
m_freem(m0);
m_freem(m);
return NULL;
}
m_adj(m, ECO_HDR_LEN);
len = m0->m_pkthdr.len + m->m_pkthdr.len;
m_cat(m0, m); /* Doesn't update packet header */
m0->m_pkthdr.len = len;
ec->ec_state = ECO_DATA_SENT;
return m0;
case ECO_DATA_SENT: /* Data ack */
KASSERT(ec->ec_packet != NULL);
m0 = ec->ec_packet;
eh0 = mtod(m0, struct eco_header *);
if (m->m_pkthdr.len != ECO_SHDR_LEN ||
memcmp(eh->eco_shost, eh0->eco_dhost, ECO_ADDR_LEN) != 0 ||
memcmp(eh->eco_dhost, eh0->eco_shost, ECO_ADDR_LEN) != 0) {
log(LOG_NOTICE, "%s: garbled data ack\n",
ifp->if_xname);
goto drop;
}
m_freem(m);
m_freem(ec->ec_packet);
ec->ec_packet = NULL;
ec->ec_state = ECO_DONE;
return NULL;
default:
drop:
m_freem(m);
break;
}
return NULL;
}
/*
* Handle an immediate operation, and return the reply, or NULL not to reply.
* Frees the incoming mbuf.
*/
static struct mbuf *
eco_immediate(struct ifnet *ifp, struct mbuf *m)
{
struct eco_header *eh, *reh;
struct mbuf *n;
static const u_int8_t machinepeek_data[] = { 42, 0, 0, 1 };
eh = mtod(m, struct eco_header *);
switch (eh->eco_control) {
case ECO_CTL_MACHINEPEEK:
MGETHDR(n, M_DONTWAIT, MT_DATA);
if (n == NULL)
goto bad;
n->m_len = n->m_pkthdr.len = ECO_SHDR_LEN + 4;
reh = mtod(n, struct eco_header *);
memcpy(reh->eco_dhost, eh->eco_shost,
ECO_ADDR_LEN);
memcpy(reh->eco_shost, LLADDR(ifp->if_sadl),
ECO_ADDR_LEN);
memcpy(mtod(n, caddr_t) + ECO_SHDR_LEN, machinepeek_data,
sizeof(machinepeek_data));
m_freem(m);
return n;
default:
bad:
m_freem(m);
return NULL;
}
}
/*
* Generate (and return) an acknowledgement for a frame. Doesn't free the
* original frame, since it's probably needed elsewhere.
*/
static struct mbuf *
eco_ack(struct ifnet *ifp, struct mbuf *m)
{
struct eco_header *eh, *reh;
struct mbuf *n;
eh = mtod(m, struct eco_header *);
MGETHDR(n, M_DONTWAIT, MT_DATA);
if (n == NULL)
return NULL;
n->m_len = n->m_pkthdr.len = ECO_SHDR_LEN;
reh = mtod(n, struct eco_header *);
memcpy(reh->eco_dhost, eh->eco_shost, ECO_ADDR_LEN);
memcpy(reh->eco_shost, LLADDR(ifp->if_sadl), ECO_ADDR_LEN);
return n;
}
void
eco_inputidle(struct ifnet *ifp)
{
struct ecocom *ec = (void *)ifp;
struct mbuf *m, *maux;
struct eco_retryparms *erp;
switch (ec->ec_state) {
case ECO_SCOUT_SENT:
case ECO_DATA_SENT:
case ECO_IMMED_SENT:
/* Outgoing packet failed. Check if we should retry. */
m = ec->ec_packet;
ec->ec_packet = NULL;
maux = m_aux_find(m, AF_LINK, ECO_MAUX_RETRYPARMS);
if (maux == NULL)
m_freem(m);
else {
erp = mtod(maux, struct eco_retryparms *);
if (--erp->erp_count > 0)
eco_defer(ifp, m, erp->erp_delay);
else {
printf("%s: pkt failed\n", ifp->if_xname);
m_freem(m);
}
}
break;
case ECO_SCOUT_RCVD:
m_freem(ec->ec_scout);
ec->ec_scout = NULL;
break;
default:
break;
}
ec->ec_state = ECO_IDLE;
ifp->if_start(ifp);
}
/*
* Convert Econet address to printable (loggable) representation.
*/
char *
eco_sprintf(const u_int8_t *ea)
{
static char buf[8];
if (ea[1] == 0)
sprintf(buf, "%d", ea[0]);
else
sprintf(buf, "%d.%d", ea[1], ea[0]);
return buf;
}
/*
* Econet retry handling.
*/
static void
eco_defer(struct ifnet *ifp, struct mbuf *m, int delay)
{
struct ecocom *ec = (struct ecocom *)ifp;
struct eco_retry *er;
int s;
MALLOC(er, struct eco_retry *, sizeof(*er), M_TEMP, M_NOWAIT);
if (er == NULL) {
m_freem(m);
return;
}
callout_init(&er->er_callout);
er->er_packet = m;
er->er_ifp = ifp;
s = splnet();
LIST_INSERT_HEAD(&ec->ec_retries, er, er_link);
splx(s);
callout_reset(&er->er_callout, delay, eco_retry, er);
}
static void
eco_retry_free(struct eco_retry *er)
{
int s;
callout_stop(&er->er_callout);
m_freem(er->er_packet);
s = splnet();
LIST_REMOVE(er, er_link);
splx(s);
FREE(er, M_TEMP);
}
static void
eco_retry(void *arg)
{
struct eco_retry *er = arg;
struct mbuf *m;
struct ifnet *ifp;
int s, error, len;
ifp = er->er_ifp;
m = er->er_packet;
len = m->m_pkthdr.len;
LIST_REMOVE(er, er_link);
s = splnet();
IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
if (error) {
splx(s);
/* XXX should defer again? */
m_freem(m);
}
ifp->if_obytes += len;
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
FREE(er, M_TEMP);
}
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