Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/boot/net.c

291 lines
7.9 KiB
C
Raw Blame History

/*
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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, Lawrence Berkeley Laboratory 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.
*
* @(#) $Header: /cvsroot/src/sys/boot/Attic/net.c,v 1.1 1993/10/12 06:02:29 glass Exp $ (LBL)
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <errno.h>
#include "netboot.h"
#include "config.h"
#include "netif.h"
/* Caller must leave room for ethernet, ip and udp headers in front!! */
int
sendudp(d, buf, len)
register struct iodesc *d;
register void *buf;
register int len;
{
register int cc;
register struct ip *ip;
register struct udphdr *up;
register u_char *ea;
if (debug)
printf("sendudp: called\n");
up = ((struct udphdr *)buf) - 1;
ip = ((struct ip *)up) - 1;
len += sizeof(*ip) + sizeof(*up);
bzero(ip, sizeof(*ip) + sizeof(*up));
ip->ip_v = IPVERSION;
ip->ip_hl = sizeof(*ip) >> 2;
ip->ip_len = htons(len);
ip->ip_p = IPPROTO_UDP;
ip->ip_ttl = IP_TTL;
ip->ip_src.s_addr = d->myip;
ip->ip_dst.s_addr = d->destip;
ip->ip_sum = in_cksum(ip, sizeof(*ip));
up->uh_sport = htons(d->myport);
up->uh_dport = htons(d->destport);
up->uh_ulen = htons(len - sizeof(*ip));
up->uh_sum = in_cksum(up, len - sizeof(*ip));
if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
mask == 0 || SAMENET(ip->ip_src.s_addr, ip->ip_dst.s_addr, mask))
ea = arpwhohas(d, ip->ip_dst.s_addr);
else
ea = arpwhohas(d, gateip);
cc = sendether(d, ip, len, ea, ETHERTYPE_IP);
if (cc < 0)
return (cc);
if (cc != len)
panic("sendudp: bad write (%d != %d)", cc, len);
return (cc - (sizeof(*ip) + sizeof(*up)));
}
/* Caller must leave room for ethernet header in front!! */
int
sendether(d, buf, len, dea, etype)
register struct iodesc *d;
register void *buf;
register int len;
register u_char *dea;
register int etype;
{
register struct ether_header *eh;
if (debug)
printf("sendether: called\n");
eh = ((struct ether_header *)buf) - 1;
len += ETHER_SIZE;
MACPY(d->myea, eh->ether_shost);
MACPY(dea, eh->ether_dhost);
eh->ether_type = etype;
return (ethernet_put(d, eh, len) - ETHER_SIZE);
}
/* Check that packet is a valid udp packet for us */
void *
checkudp(d, pkt, lenp)
register struct iodesc *d;
register void *pkt;
register int *lenp;
{
register int hlen, len;
register struct ether_header *eh;
register struct ip *ip;
register struct udphdr *up;
if (debug)
printf("checkudp: called\n");
eh = pkt;
ip = (struct ip *)(eh + 1);
up = (struct udphdr *)(ip + 1);
/* Must be to us */
if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
bcmp(bcea, eh->ether_dhost, 6) != 0)
return (NULL);
/* And ip */
if (eh->ether_type != ETHERTYPE_IP)
return (NULL);
/* Check ip header */
if (ip->ip_v != IPVERSION || ip->ip_p != IPPROTO_UDP)
return (NULL);
hlen = ip->ip_hl << 2;
if (hlen < sizeof(*ip) || in_cksum(ip, hlen) != 0)
return (NULL);
NTOHS(ip->ip_len);
if (*lenp - sizeof(*eh) < ip->ip_len)
return (NULL);
if (d->myip && ip->ip_dst.s_addr != d->myip)
return (NULL);
/* If there were ip options, make them go away */
if (hlen != sizeof(*ip)) {
bcopy(((u_char *)ip) + hlen, up,
*lenp - (sizeof(*eh) + hlen));
ip->ip_len = sizeof(*ip);
*lenp -= hlen - sizeof(*ip);
}
if (ntohs(up->uh_dport) != d->myport)
return (NULL);
if (up->uh_sum) {
len = ntohs(up->uh_ulen);
if (len > RECV_SIZE - (sizeof(*eh) + sizeof(*ip))) {
printf("checkudp: huge packet, udp len %lu\n", len);
return (NULL);
}
if (in_cksum(up, len) != 0)
return (NULL);
}
NTOHS(up->uh_dport);
NTOHS(up->uh_sport);
NTOHS(up->uh_ulen);
if (up->uh_ulen < sizeof(*up))
return (NULL);
*lenp -= sizeof(*eh) + sizeof(*ip) + sizeof(*up);
return (up + 1);
}
/*
* Send a packet and wait for a reply, with exponential backoff.
*
* The send routine must return the actual number of bytes written.
*
* The receive routine can indicate success by returning the number of
* bytes read; it can return 0 to indicate EOF; it can return -1 with a
* non-zero errno to indicate failure; finally, it can return -1 with a
* zero errno to indicate it isn't done yet.
*/
int
sendrecv(d, sproc, sbuf, ssize, rproc, rbuf, rsize)
register struct iodesc *d;
register int (*sproc)(struct iodesc *, void *, int);
register void *sbuf;
register int ssize;
register int (*rproc)(struct iodesc *, void *, int);
register void *rbuf;
register int rsize;
{
register int cc;
register time_t t, tmo, tlast, tleft;
if (debug)
printf("sendrecv: called\n");
tmo = MINTMO;
tlast = tleft = 0;
t = getsecs();
for (;;) {
if (tleft <= 0) {
cc = (*sproc)(d, sbuf, ssize);
if (cc < ssize)
panic("sendrecv: short write! (%d < %d)",
cc, ssize);
tleft = tmo;
tmo <<= 1;
if (tmo > MAXTMO)
tmo = MAXTMO;
tlast = t;
}
cc = ethernet_get(d, rbuf, rsize, tleft);
if (cc >= 0) {
/* Got a packet, process it */
cc = (*rproc)(d, rbuf, cc);
/* Return on data, EOF or real error */
if (cc >= 0 || errno != 0)
return (cc);
}
/* Timed out or didn't get the packet we're waiting for */
t = getsecs();
tleft -= t - tlast;
tlast = t;
}
}
int ethernet_get(desc, pkt, len, timeout)
struct iodesc *desc;
void *pkt;
int len;
time_t timeout;
{
int val;
val = desc->io_netif->netif_get(desc, pkt, len, timeout);
if (debug)
printf("ethernet_get: received %d\n", val);
return val;
}
int ethernet_put(desc, pkt, len)
struct iodesc *desc;
void *pkt;
int len;
{
int count, val;
if (debug) {
struct ether_header *eh;
printf("ethernet_put: called\n");
eh = pkt;
printf("ethernet_put: ether_dhost %s\n",
ether_sprintf(eh->ether_dhost));
printf("ethernet_put: ether_shost %s\n",
ether_sprintf(eh->ether_shost));
printf("ethernet_put: ether_type %x\n", eh->ether_type);
}
if (!desc->io_netif)
panic("ethernet_put: no netif_put support");
val = desc->io_netif->netif_put(desc, pkt, len);
return val;
}
Reference in New Issue View Git Blame Copy Permalink