136 lines
4 KiB
C
136 lines
4 KiB
C
/* $NetBSD: udp.c,v 1.11 2011/05/11 16:23:40 zoltan Exp $ */
|
|
|
|
/*
|
|
* 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: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/socket.h>
|
|
|
|
#ifdef _STANDALONE
|
|
#include <lib/libkern/libkern.h>
|
|
#else
|
|
#include <string.h>
|
|
#endif
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_ether.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/udp.h>
|
|
#include <netinet/udp_var.h>
|
|
|
|
#include "stand.h"
|
|
#include "net.h"
|
|
|
|
|
|
/* Caller must leave room for ethernet, ip and udp headers in front!! */
|
|
ssize_t
|
|
sendudp(struct iodesc *d, void *pkt, size_t len)
|
|
{
|
|
ssize_t cc;
|
|
struct udphdr *uh;
|
|
|
|
#ifdef NET_DEBUG
|
|
if (debug) {
|
|
printf("sendudp: d=%lx called.\n", (long)d);
|
|
if (d) {
|
|
printf("saddr: %s:%d",
|
|
inet_ntoa(d->myip), ntohs(d->myport));
|
|
printf(" daddr: %s:%d\n",
|
|
inet_ntoa(d->destip), ntohs(d->destport));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
uh = (struct udphdr *)pkt - 1;
|
|
len += sizeof(*uh);
|
|
|
|
(void)memset(uh, 0, sizeof(*uh));
|
|
|
|
uh->uh_sport = d->myport;
|
|
uh->uh_dport = d->destport;
|
|
uh->uh_ulen = htons(len);
|
|
|
|
cc = sendip(d, uh, len, IPPROTO_UDP);
|
|
if (cc == -1)
|
|
return -1;
|
|
if ((size_t)cc != len)
|
|
panic("sendudp: bad write (%zd != %zu)", cc, len);
|
|
return (cc - sizeof(*uh));
|
|
}
|
|
|
|
/*
|
|
* Receive a UDP packet and validate it is for us.
|
|
* Caller leaves room for the headers (Ether, IP, UDP)
|
|
*/
|
|
ssize_t
|
|
readudp(struct iodesc *d, void *pkt, size_t len, saseconds_t tleft)
|
|
{
|
|
ssize_t n;
|
|
struct udphdr *uh;
|
|
|
|
uh = (struct udphdr *)pkt - 1;
|
|
n = readip(d, uh, len + sizeof(*uh), tleft, IPPROTO_UDP);
|
|
if (n == -1 || (size_t)n < sizeof(*uh))
|
|
return -1;
|
|
|
|
if (uh->uh_dport != d->myport) {
|
|
#ifdef NET_DEBUG
|
|
if (debug)
|
|
printf("readudp: bad dport %d != %d\n",
|
|
d->myport, ntohs(uh->uh_dport));
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
if (ntohs(uh->uh_ulen) < sizeof(*uh)) {
|
|
#ifdef NET_DEBUG
|
|
if (debug)
|
|
printf("readudp: bad udp len %d < %d\n",
|
|
ntohs(uh->uh_ulen), (int)sizeof(*uh));
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
n -= sizeof(*uh);
|
|
return n;
|
|
}
|