NetBSD/sys/lib/libsa/net.c

394 lines
9.6 KiB
C

/* $NetBSD: net.c,v 1.3 1994/10/26 05:44:52 cgd 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>
#include <string.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/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include "stand.h"
#include "net.h"
#include "netif.h"
n_long myip;
/* 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 udpiphdr *ui;
register struct udphdr *uh;
register u_char *ea;
struct ip tip;
#ifdef NET_DEBUG
if (debug) {
printf("sendudp: d=%x called.\n", (u_int)d);
if (d) {
printf("saddr: %s:%d",
intoa(d->myip), d->myport);
printf(" daddr: %s:%d\n",
intoa(d->destip), d->destport);
}
}
#endif
uh = ((struct udphdr *)buf) - 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.s_addr = htonl(d->myip);
ip->ip_dst.s_addr = htonl(d->destip);
ip->ip_sum = in_cksum(ip, sizeof(*ip)); /* short, but special */
uh->uh_sport = htons(d->myport);
uh->uh_dport = htons(d->destport);
uh->uh_ulen = htons(len - sizeof(*ip));
/* Calculate checksum (must save and restore ip header) */
tip = *ip;
ui = (struct udpiphdr *)ip;
ui->ui_next = 0;
ui->ui_prev = 0;
ui->ui_x1 = 0;
ui->ui_len = uh->uh_ulen;
uh->uh_sum = in_cksum(ui, len);
*ip = tip;
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, htonl(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(*uh)));
}
/* 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 *uh;
register struct udpiphdr *ui;
struct ip tip;
#ifdef NET_DEBUG
if (debug)
printf("checkudp: called\n");
#endif
eh = pkt;
ip = (struct ip *)(eh + 1);
uh = (struct udphdr *)(ip + 1);
/* Must be to us */
if (bcmp(d->myea, eh->ether_dhost, 6) != 0 && /* by byte */
bcmp(bcea, eh->ether_dhost, 6) != 0) { /* by byte */
#ifdef NET_DEBUG
if (debug)
printf("checkudp: not ours. myea=%s bcea=%s\n",
ether_sprintf(d->myea), ether_sprintf(bcea));
#endif
return (NULL);
}
/* And ip */
if (ntohs(eh->ether_type) != ETHERTYPE_IP) {
#ifdef NET_DEBUG
if (debug)
printf("checkudp: not IP. ether_type=%x\n", eh->ether_type);
#endif
return (NULL);
}
/* Check ip header */
if (ip->ip_v != IPVERSION || ip->ip_p != IPPROTO_UDP) { /* half char */
#ifdef NET_DEBUG
if (debug)
printf("checkudp: IP version or not UDP. ip_v=%d ip_p=%d\n", ip->ip_v, ip->ip_p);
#endif
return (NULL);
}
hlen = ip->ip_hl << 2;
if (hlen < sizeof(*ip) || in_cksum(ip, hlen) != 0) {
#ifdef NET_DEBUG
if (debug)
printf("checkudp: short hdr or bad cksum.\n");
#endif
return (NULL);
}
NTOHS(ip->ip_len);
if (*lenp - sizeof(*eh) < ip->ip_len) {
#ifdef NET_DEBUG
if (debug)
printf("checkudp: bad length %d < %d.\n",
*lenp - sizeof(*eh), ip->ip_len);
#endif
return (NULL);
}
if (d->myip && ntohl(ip->ip_dst.s_addr) != d->myip) {
#ifdef NET_DEBUG
if (debug) {
printf("checkudp: bad saddr %s != ",
intoa(d->myip));
printf("%s\n",
intoa(ntohl(ip->ip_dst.s_addr)));
}
#endif
return (NULL);
}
/* If there were ip options, make them go away */
if (hlen != sizeof(*ip)) {
bcopy(((u_char *)ip) + hlen, uh,
*lenp - (sizeof(*eh) + hlen));
ip->ip_len = sizeof(*ip);
*lenp -= hlen - sizeof(*ip);
}
if (ntohs(uh->uh_dport) != d->myport) {
#ifdef NET_DEBUG
if (debug)
printf("checkudp: bad dport %d != %d\n",
d->myport, ntohs(uh->uh_dport));
#endif
return (NULL);
}
if (uh->uh_sum) {
len = ntohs(uh->uh_ulen);
if (len > RECV_SIZE - (sizeof(*eh) + sizeof(*ip))) {
printf("checkudp: huge packet, udp len %d\n", len);
return (NULL);
}
/* Check checksum (must save and restore ip header) */
tip = *ip;
ui = (struct udpiphdr *)ip;
ui->ui_next = 0;
ui->ui_prev = 0;
ui->ui_x1 = 0;
ui->ui_len = uh->uh_ulen;
if (in_cksum(ui, len + sizeof(*ip)) != 0) {
#ifdef NET_DEBUG
if (debug)
printf("checkudp: bad cksum\n");
#endif
*ip = tip;
return (NULL);
}
*ip = tip;
}
NTOHS(uh->uh_dport);
NTOHS(uh->uh_sport);
NTOHS(uh->uh_ulen);
if (uh->uh_ulen < sizeof(*uh)) {
#ifdef NET_DEBUG
if (debug)
printf("checkudp: bad udp len %d < %d\n",
uh->uh_ulen, sizeof(*uh));
#endif
return (NULL);
}
*lenp -= sizeof(*eh) + sizeof(*ip) + sizeof(*uh);
return (uh + 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;
#ifdef NET_DEBUG
if (debug)
printf("sendrecv: called\n");
#endif
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 = netif_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;
}
}
/* Similar to inet_ntoa() */
char *
intoa(addr)
n_long addr;
{
register char *cp;
register u_int byte;
register int n;
static char buf[17]; /* strlen(".255.255.255.255") + 1 */
cp = &buf[sizeof buf];
*--cp = '\0';
n = 4;
do {
byte = addr & 0xff;
*--cp = byte % 10 + '0';
byte /= 10;
if (byte > 0) {
*--cp = byte % 10 + '0';
byte /= 10;
if (byte > 0)
*--cp = byte + '0';
}
*--cp = '.';
addr >>= 8;
} while (--n > 0);
return (cp+1);
}
static char *
number(s, n)
char *s;
int *n;
{
for (*n = 0; isdigit(*s); s++)
*n = (*n * 10) + *s - '0';
return s;
}
n_long
ip_convertaddr(p)
char *p;
{
#define IP_ANYADDR 0
n_long addr = 0, n;
if (p == (char *)0 || *p == '\0')
return IP_ANYADDR;
p = number(p, &n);
addr |= (n << 24) & 0xff000000;
if (*p == '\0' || *p++ != '.')
return IP_ANYADDR;
p = number(p, &n);
addr |= (n << 16) & 0xff0000;
if (*p == '\0' || *p++ != '.')
return IP_ANYADDR;
p = number(p, &n);
addr |= (n << 8) & 0xff00;
if (*p == '\0' || *p++ != '.')
return IP_ANYADDR;
p = number(p, &n);
addr |= n & 0xff;
if (*p != '\0')
return IP_ANYADDR;
return ntohl(addr);
}