Split the UDP routines out of net.c.
This commit is contained in:
thorpej
parent
9209a6a5b4
commit
9516ee90da
|
|
@ -1,4 +1,4 @@
|
||||||
# $NetBSD: Makefile,v 1.41 1999/11/13 21:06:46 thorpej Exp $
|
# $NetBSD: Makefile,v 1.42 2000/10/25 01:49:55 thorpej Exp $
|
||||||
|
|
||||||
LIB= sa
|
LIB= sa
|
||||||
MKPIC= no
|
MKPIC= no
|
||||||
|
|
@ -35,7 +35,7 @@ SRCS+= loadfile.c
|
||||||
.endif
|
.endif
|
||||||
.if (${SA_INCLUDE_NET} == "yes")
|
.if (${SA_INCLUDE_NET} == "yes")
|
||||||
# network routines
|
# network routines
|
||||||
SRCS+= arp.c ether.c in_cksum.c net.c netif.c rpc.c
|
SRCS+= arp.c ether.c in_cksum.c net.c netif.c rpc.c udp.c
|
||||||
|
|
||||||
# network info services:
|
# network info services:
|
||||||
SRCS+= bootp.c rarp.c bootparam.c
|
SRCS+= bootp.c rarp.c bootparam.c
|
||||||
|
|
|
||||||
|
|
@ -1,4 +1,4 @@
|
||||||
/* $NetBSD: net.c,v 1.26 2000/03/30 12:19:48 augustss Exp $ */
|
/* $NetBSD: net.c,v 1.27 2000/10/25 01:49:55 thorpej Exp $ */
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Copyright (c) 1992 Regents of the University of California.
|
* Copyright (c) 1992 Regents of the University of California.
|
||||||
|
|
@ -54,227 +54,10 @@
|
||||||
#include <netinet/in.h>
|
#include <netinet/in.h>
|
||||||
#include <netinet/in_systm.h>
|
#include <netinet/in_systm.h>
|
||||||
#include <netinet/ip.h>
|
#include <netinet/ip.h>
|
||||||
#include <netinet/ip_var.h>
|
|
||||||
#include <netinet/udp.h>
|
|
||||||
#include <netinet/udp_var.h>
|
|
||||||
|
|
||||||
#include "stand.h"
|
#include "stand.h"
|
||||||
#include "net.h"
|
#include "net.h"
|
||||||
|
|
||||||
|
|
||||||
/* Caller must leave room for ethernet, ip and udp headers in front!! */
|
|
||||||
ssize_t
|
|
||||||
sendudp(d, pkt, len)
|
|
||||||
struct iodesc *d;
|
|
||||||
void *pkt;
|
|
||||||
size_t len;
|
|
||||||
{
|
|
||||||
ssize_t cc;
|
|
||||||
struct ip *ip;
|
|
||||||
struct udphdr *uh;
|
|
||||||
u_char *ea;
|
|
||||||
|
|
||||||
#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;
|
|
||||||
ip = (struct ip *)uh - 1;
|
|
||||||
len += sizeof(*ip) + sizeof(*uh);
|
|
||||||
|
|
||||||
bzero(ip, sizeof(*ip) + sizeof(*uh));
|
|
||||||
|
|
||||||
ip->ip_v = IPVERSION; /* half-char */
|
|
||||||
ip->ip_hl = sizeof(*ip) >> 2; /* half-char */
|
|
||||||
ip->ip_len = htons(len);
|
|
||||||
ip->ip_p = IPPROTO_UDP; /* char */
|
|
||||||
ip->ip_ttl = IP_TTL; /* char */
|
|
||||||
ip->ip_src = d->myip;
|
|
||||||
ip->ip_dst = d->destip;
|
|
||||||
ip->ip_sum = in_cksum(ip, sizeof(*ip)); /* short, but special */
|
|
||||||
|
|
||||||
uh->uh_sport = d->myport;
|
|
||||||
uh->uh_dport = d->destport;
|
|
||||||
uh->uh_ulen = htons(len - sizeof(*ip));
|
|
||||||
|
|
||||||
#ifndef UDP_NO_CKSUM
|
|
||||||
{
|
|
||||||
struct udpiphdr *ui;
|
|
||||||
struct ip tip;
|
|
||||||
|
|
||||||
/* Calculate checksum (must save and restore ip header) */
|
|
||||||
tip = *ip;
|
|
||||||
ui = (struct udpiphdr *)ip;
|
|
||||||
bzero(ui->ui_x1, sizeof(ui->ui_x1));
|
|
||||||
ui->ui_len = uh->uh_ulen;
|
|
||||||
uh->uh_sum = in_cksum(ui, len);
|
|
||||||
*ip = tip;
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
|
|
||||||
if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
|
|
||||||
netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask))
|
|
||||||
ea = arpwhohas(d, ip->ip_dst);
|
|
||||||
else
|
|
||||||
ea = arpwhohas(d, gateip);
|
|
||||||
|
|
||||||
cc = sendether(d, ip, len, ea, ETHERTYPE_IP);
|
|
||||||
if (cc == -1)
|
|
||||||
return (-1);
|
|
||||||
if (cc != len)
|
|
||||||
panic("sendudp: bad write (%d != %d)", cc, len);
|
|
||||||
return (cc - (sizeof(*ip) + sizeof(*uh)));
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Receive a UDP packet and validate it is for us.
|
|
||||||
* Caller leaves room for the headers (Ether, IP, UDP)
|
|
||||||
*/
|
|
||||||
ssize_t
|
|
||||||
readudp(d, pkt, len, tleft)
|
|
||||||
struct iodesc *d;
|
|
||||||
void *pkt;
|
|
||||||
size_t len;
|
|
||||||
time_t tleft;
|
|
||||||
{
|
|
||||||
ssize_t n;
|
|
||||||
size_t hlen;
|
|
||||||
struct ip *ip;
|
|
||||||
struct udphdr *uh;
|
|
||||||
u_int16_t etype; /* host order */
|
|
||||||
|
|
||||||
#ifdef NET_DEBUG
|
|
||||||
if (debug)
|
|
||||||
printf("readudp: called\n");
|
|
||||||
#endif
|
|
||||||
|
|
||||||
uh = (struct udphdr *)pkt - 1;
|
|
||||||
ip = (struct ip *)uh - 1;
|
|
||||||
|
|
||||||
n = readether(d, ip, len + sizeof(*ip) + sizeof(*uh), tleft, &etype);
|
|
||||||
if (n == -1 || n < sizeof(*ip) + sizeof(*uh))
|
|
||||||
return -1;
|
|
||||||
|
|
||||||
/* Ethernet address checks now in readether() */
|
|
||||||
|
|
||||||
/* Need to respond to ARP requests. */
|
|
||||||
if (etype == ETHERTYPE_ARP) {
|
|
||||||
struct arphdr *ah = (void *)ip;
|
|
||||||
if (ah->ar_op == htons(ARPOP_REQUEST)) {
|
|
||||||
/* Send ARP reply */
|
|
||||||
arp_reply(d, ah);
|
|
||||||
}
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (etype != ETHERTYPE_IP) {
|
|
||||||
#ifdef NET_DEBUG
|
|
||||||
if (debug)
|
|
||||||
printf("readudp: not IP. ether_type=%x\n", etype);
|
|
||||||
#endif
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Check ip header */
|
|
||||||
if (ip->ip_v != IPVERSION ||
|
|
||||||
ip->ip_p != IPPROTO_UDP) { /* half char */
|
|
||||||
#ifdef NET_DEBUG
|
|
||||||
if (debug)
|
|
||||||
printf("readudp: IP version or not UDP. ip_v=%d ip_p=%d\n", ip->ip_v, ip->ip_p);
|
|
||||||
#endif
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
hlen = ip->ip_hl << 2;
|
|
||||||
if (hlen < sizeof(*ip) ||
|
|
||||||
in_cksum(ip, hlen) != 0) {
|
|
||||||
#ifdef NET_DEBUG
|
|
||||||
if (debug)
|
|
||||||
printf("readudp: short hdr or bad cksum.\n");
|
|
||||||
#endif
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
if (n < ntohs(ip->ip_len)) {
|
|
||||||
#ifdef NET_DEBUG
|
|
||||||
if (debug)
|
|
||||||
printf("readudp: bad length %d < %d.\n",
|
|
||||||
(int)n, ntohs(ip->ip_len));
|
|
||||||
#endif
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
|
|
||||||
#ifdef NET_DEBUG
|
|
||||||
if (debug) {
|
|
||||||
printf("readudp: bad saddr %s != ", inet_ntoa(d->myip));
|
|
||||||
printf("%s\n", inet_ntoa(ip->ip_dst));
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* If there were ip options, make them go away */
|
|
||||||
if (hlen != sizeof(*ip)) {
|
|
||||||
bcopy(((u_char *)ip) + hlen, uh, len - hlen);
|
|
||||||
ip->ip_len = htons(sizeof(*ip));
|
|
||||||
n -= hlen - sizeof(*ip);
|
|
||||||
}
|
|
||||||
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;
|
|
||||||
}
|
|
||||||
|
|
||||||
#ifndef UDP_NO_CKSUM
|
|
||||||
if (uh->uh_sum) {
|
|
||||||
struct udpiphdr *ui;
|
|
||||||
struct ip tip;
|
|
||||||
|
|
||||||
n = ntohs(uh->uh_ulen) + sizeof(*ip);
|
|
||||||
if (n > RECV_SIZE - ETHER_SIZE) {
|
|
||||||
printf("readudp: huge packet, udp len %d\n", (int)n);
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Check checksum (must save and restore ip header) */
|
|
||||||
tip = *ip;
|
|
||||||
ui = (struct udpiphdr *)ip;
|
|
||||||
bzero(ui->ui_x1, sizeof(ui->ui_x1));
|
|
||||||
ui->ui_len = uh->uh_ulen;
|
|
||||||
if (in_cksum(ui, n) != 0) {
|
|
||||||
#ifdef NET_DEBUG
|
|
||||||
if (debug)
|
|
||||||
printf("readudp: bad cksum\n");
|
|
||||||
#endif
|
|
||||||
*ip = tip;
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
*ip = tip;
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
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(*ip) + sizeof(*uh);
|
|
||||||
return (n);
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Send a packet and wait for a reply, with exponential backoff.
|
* Send a packet and wait for a reply, with exponential backoff.
|
||||||
*
|
*
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,276 @@
|
||||||
|
/* $NetBSD: udp.c,v 1.1 2000/10/25 01:49:55 thorpej 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(d, pkt, len)
|
||||||
|
struct iodesc *d;
|
||||||
|
void *pkt;
|
||||||
|
size_t len;
|
||||||
|
{
|
||||||
|
ssize_t cc;
|
||||||
|
struct ip *ip;
|
||||||
|
struct udphdr *uh;
|
||||||
|
u_char *ea;
|
||||||
|
|
||||||
|
#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;
|
||||||
|
ip = (struct ip *)uh - 1;
|
||||||
|
len += sizeof(*ip) + sizeof(*uh);
|
||||||
|
|
||||||
|
bzero(ip, sizeof(*ip) + sizeof(*uh));
|
||||||
|
|
||||||
|
ip->ip_v = IPVERSION; /* half-char */
|
||||||
|
ip->ip_hl = sizeof(*ip) >> 2; /* half-char */
|
||||||
|
ip->ip_len = htons(len);
|
||||||
|
ip->ip_p = IPPROTO_UDP; /* char */
|
||||||
|
ip->ip_ttl = IP_TTL; /* char */
|
||||||
|
ip->ip_src = d->myip;
|
||||||
|
ip->ip_dst = d->destip;
|
||||||
|
ip->ip_sum = in_cksum(ip, sizeof(*ip)); /* short, but special */
|
||||||
|
|
||||||
|
uh->uh_sport = d->myport;
|
||||||
|
uh->uh_dport = d->destport;
|
||||||
|
uh->uh_ulen = htons(len - sizeof(*ip));
|
||||||
|
|
||||||
|
#ifndef UDP_NO_CKSUM
|
||||||
|
{
|
||||||
|
struct udpiphdr *ui;
|
||||||
|
struct ip tip;
|
||||||
|
|
||||||
|
/* Calculate checksum (must save and restore ip header) */
|
||||||
|
tip = *ip;
|
||||||
|
ui = (struct udpiphdr *)ip;
|
||||||
|
bzero(ui->ui_x1, sizeof(ui->ui_x1));
|
||||||
|
ui->ui_len = uh->uh_ulen;
|
||||||
|
uh->uh_sum = in_cksum(ui, len);
|
||||||
|
*ip = tip;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
|
||||||
|
netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask))
|
||||||
|
ea = arpwhohas(d, ip->ip_dst);
|
||||||
|
else
|
||||||
|
ea = arpwhohas(d, gateip);
|
||||||
|
|
||||||
|
cc = sendether(d, ip, len, ea, ETHERTYPE_IP);
|
||||||
|
if (cc == -1)
|
||||||
|
return (-1);
|
||||||
|
if (cc != len)
|
||||||
|
panic("sendudp: bad write (%d != %d)", cc, len);
|
||||||
|
return (cc - (sizeof(*ip) + sizeof(*uh)));
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Receive a UDP packet and validate it is for us.
|
||||||
|
* Caller leaves room for the headers (Ether, IP, UDP)
|
||||||
|
*/
|
||||||
|
ssize_t
|
||||||
|
readudp(d, pkt, len, tleft)
|
||||||
|
struct iodesc *d;
|
||||||
|
void *pkt;
|
||||||
|
size_t len;
|
||||||
|
time_t tleft;
|
||||||
|
{
|
||||||
|
ssize_t n;
|
||||||
|
size_t hlen;
|
||||||
|
struct ip *ip;
|
||||||
|
struct udphdr *uh;
|
||||||
|
u_int16_t etype; /* host order */
|
||||||
|
|
||||||
|
#ifdef NET_DEBUG
|
||||||
|
if (debug)
|
||||||
|
printf("readudp: called\n");
|
||||||
|
#endif
|
||||||
|
|
||||||
|
uh = (struct udphdr *)pkt - 1;
|
||||||
|
ip = (struct ip *)uh - 1;
|
||||||
|
|
||||||
|
n = readether(d, ip, len + sizeof(*ip) + sizeof(*uh), tleft, &etype);
|
||||||
|
if (n == -1 || n < sizeof(*ip) + sizeof(*uh))
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
/* Ethernet address checks now in readether() */
|
||||||
|
|
||||||
|
/* Need to respond to ARP requests. */
|
||||||
|
if (etype == ETHERTYPE_ARP) {
|
||||||
|
struct arphdr *ah = (void *)ip;
|
||||||
|
if (ah->ar_op == htons(ARPOP_REQUEST)) {
|
||||||
|
/* Send ARP reply */
|
||||||
|
arp_reply(d, ah);
|
||||||
|
}
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (etype != ETHERTYPE_IP) {
|
||||||
|
#ifdef NET_DEBUG
|
||||||
|
if (debug)
|
||||||
|
printf("readudp: not IP. ether_type=%x\n", etype);
|
||||||
|
#endif
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Check ip header */
|
||||||
|
if (ip->ip_v != IPVERSION ||
|
||||||
|
ip->ip_p != IPPROTO_UDP) { /* half char */
|
||||||
|
#ifdef NET_DEBUG
|
||||||
|
if (debug)
|
||||||
|
printf("readudp: IP version or not UDP. ip_v=%d ip_p=%d\n", ip->ip_v, ip->ip_p);
|
||||||
|
#endif
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
hlen = ip->ip_hl << 2;
|
||||||
|
if (hlen < sizeof(*ip) ||
|
||||||
|
in_cksum(ip, hlen) != 0) {
|
||||||
|
#ifdef NET_DEBUG
|
||||||
|
if (debug)
|
||||||
|
printf("readudp: short hdr or bad cksum.\n");
|
||||||
|
#endif
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
if (n < ntohs(ip->ip_len)) {
|
||||||
|
#ifdef NET_DEBUG
|
||||||
|
if (debug)
|
||||||
|
printf("readudp: bad length %d < %d.\n",
|
||||||
|
(int)n, ntohs(ip->ip_len));
|
||||||
|
#endif
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
|
||||||
|
#ifdef NET_DEBUG
|
||||||
|
if (debug) {
|
||||||
|
printf("readudp: bad saddr %s != ", inet_ntoa(d->myip));
|
||||||
|
printf("%s\n", inet_ntoa(ip->ip_dst));
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* If there were ip options, make them go away */
|
||||||
|
if (hlen != sizeof(*ip)) {
|
||||||
|
bcopy(((u_char *)ip) + hlen, uh, len - hlen);
|
||||||
|
ip->ip_len = htons(sizeof(*ip));
|
||||||
|
n -= hlen - sizeof(*ip);
|
||||||
|
}
|
||||||
|
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;
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifndef UDP_NO_CKSUM
|
||||||
|
if (uh->uh_sum) {
|
||||||
|
struct udpiphdr *ui;
|
||||||
|
struct ip tip;
|
||||||
|
|
||||||
|
n = ntohs(uh->uh_ulen) + sizeof(*ip);
|
||||||
|
if (n > RECV_SIZE - ETHER_SIZE) {
|
||||||
|
printf("readudp: huge packet, udp len %d\n", (int)n);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Check checksum (must save and restore ip header) */
|
||||||
|
tip = *ip;
|
||||||
|
ui = (struct udpiphdr *)ip;
|
||||||
|
bzero(ui->ui_x1, sizeof(ui->ui_x1));
|
||||||
|
ui->ui_len = uh->uh_ulen;
|
||||||
|
if (in_cksum(ui, n) != 0) {
|
||||||
|
#ifdef NET_DEBUG
|
||||||
|
if (debug)
|
||||||
|
printf("readudp: bad cksum\n");
|
||||||
|
#endif
|
||||||
|
*ip = tip;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
*ip = tip;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
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(*ip) + sizeof(*uh);
|
||||||
|
return (n);
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue