d9124da47f
(PR#1404). Things to be noted: - all IP addresses are now `struct in_addr's. - the function rarp_getipaddress() no longer return `myip'; in stead it returns -1 on failure (errno set), 0 on success. `myip' is set as a size-effect.
411 lines
9.7 KiB
C
411 lines
9.7 KiB
C
/* $NetBSD: net.c,v 1.8 1995/09/18 21:19:30 pk Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include "stand.h"
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#include "net.h"
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/* Caller must leave room for ethernet, ip and udp headers in front!! */
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ssize_t
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sendudp(d, pkt, len)
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register struct iodesc *d;
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register void *pkt;
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register size_t len;
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{
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register ssize_t cc;
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register struct ip *ip;
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register struct udpiphdr *ui;
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register struct udphdr *uh;
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register u_char *ea;
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struct ip tip;
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#ifdef NET_DEBUG
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if (debug) {
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printf("sendudp: d=%x called.\n", (u_int)d);
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if (d) {
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printf("saddr: %s:%d",
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inet_ntoa(d->myip), ntohs(d->myport));
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printf(" daddr: %s:%d\n",
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inet_ntoa(d->destip), ntohs(d->destport));
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}
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}
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#endif
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uh = (struct udphdr *)pkt - 1;
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ip = (struct ip *)uh - 1;
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len += sizeof(*ip) + sizeof(*uh);
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bzero(ip, sizeof(*ip) + sizeof(*uh));
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ip->ip_v = IPVERSION; /* half-char */
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ip->ip_hl = sizeof(*ip) >> 2; /* half-char */
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ip->ip_len = htons(len);
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ip->ip_p = IPPROTO_UDP; /* char */
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ip->ip_ttl = IP_TTL; /* char */
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ip->ip_src = d->myip;
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ip->ip_dst = d->destip;
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ip->ip_sum = in_cksum(ip, sizeof(*ip)); /* short, but special */
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uh->uh_sport = d->myport;
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uh->uh_dport = d->destport;
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uh->uh_ulen = htons(len - sizeof(*ip));
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/* Calculate checksum (must save and restore ip header) */
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tip = *ip;
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ui = (struct udpiphdr *)ip;
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ui->ui_next = 0;
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ui->ui_prev = 0;
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ui->ui_x1 = 0;
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ui->ui_len = uh->uh_ulen;
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uh->uh_sum = in_cksum(ui, len);
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*ip = tip;
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if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
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netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask))
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ea = arpwhohas(d, ip->ip_dst);
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else
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ea = arpwhohas(d, gateip);
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cc = sendether(d, ip, len, ea, ETHERTYPE_IP);
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if (cc == -1)
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return (-1);
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if (cc != len)
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panic("sendudp: bad write (%d != %d)", cc, len);
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return (cc - (sizeof(*ip) + sizeof(*uh)));
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}
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/*
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* Receive a UDP packet and validate it is for us.
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* Caller leaves room for the headers (Ether, IP, UDP)
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*/
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ssize_t
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readudp(d, pkt, len, tleft)
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register struct iodesc *d;
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register void *pkt;
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register size_t len;
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time_t tleft;
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{
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register ssize_t n;
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register size_t hlen;
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register struct ip *ip;
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register struct udphdr *uh;
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register struct udpiphdr *ui;
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struct ip tip;
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u_int16_t etype; /* host order */
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#ifdef NET_DEBUG
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if (debug)
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printf("readudp: called\n");
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#endif
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uh = (struct udphdr *)pkt - 1;
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ip = (struct ip *)uh - 1;
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n = readether(d, ip, len + sizeof(*ip) + sizeof(*uh), tleft, &etype);
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if (n == -1 || n < sizeof(*ip) + sizeof(*uh))
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return -1;
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/* Ethernet address checks now in readether() */
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/* Need to respond to ARP requests. */
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if (etype == ETHERTYPE_ARP) {
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struct arphdr *ah = (void *)ip;
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if (ah->ar_op == htons(ARPOP_REQUEST)) {
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/* Send ARP reply */
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arp_reply(d, ah);
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}
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return -1;
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}
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if (etype != ETHERTYPE_IP) {
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#ifdef NET_DEBUG
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if (debug)
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printf("readudp: not IP. ether_type=%x\n", etype);
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#endif
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return -1;
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}
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/* Check ip header */
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if (ip->ip_v != IPVERSION ||
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ip->ip_p != IPPROTO_UDP) { /* half char */
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#ifdef NET_DEBUG
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if (debug)
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printf("readudp: IP version or not UDP. ip_v=%d ip_p=%d\n", ip->ip_v, ip->ip_p);
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#endif
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return -1;
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}
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hlen = ip->ip_hl << 2;
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if (hlen < sizeof(*ip) ||
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in_cksum(ip, hlen) != 0) {
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#ifdef NET_DEBUG
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if (debug)
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printf("readudp: short hdr or bad cksum.\n");
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#endif
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return -1;
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}
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NTOHS(ip->ip_len);
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if (n < ip->ip_len) {
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#ifdef NET_DEBUG
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if (debug)
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printf("readudp: bad length %d < %d.\n", n, ip->ip_len);
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#endif
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return -1;
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}
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if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
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#ifdef NET_DEBUG
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if (debug) {
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printf("readudp: bad saddr %s != ", inet_ntoa(d->myip));
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printf("%s\n", inet_ntoa(ip->ip_dst));
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}
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#endif
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return -1;
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}
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/* If there were ip options, make them go away */
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if (hlen != sizeof(*ip)) {
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bcopy(((u_char *)ip) + hlen, uh, len - hlen);
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ip->ip_len = sizeof(*ip);
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n -= hlen - sizeof(*ip);
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}
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if (uh->uh_dport != d->myport) {
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#ifdef NET_DEBUG
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if (debug)
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printf("readudp: bad dport %d != %d\n",
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d->myport, ntohs(uh->uh_dport));
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#endif
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return -1;
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}
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if (uh->uh_sum) {
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n = ntohs(uh->uh_ulen) + sizeof(*ip);
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if (n > RECV_SIZE - ETHER_SIZE) {
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printf("readudp: huge packet, udp len %d\n", n);
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return -1;
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}
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/* Check checksum (must save and restore ip header) */
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tip = *ip;
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ui = (struct udpiphdr *)ip;
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ui->ui_next = 0;
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ui->ui_prev = 0;
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ui->ui_x1 = 0;
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ui->ui_len = uh->uh_ulen;
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if (in_cksum(ui, n) != 0) {
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#ifdef NET_DEBUG
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if (debug)
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printf("readudp: bad cksum\n");
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#endif
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*ip = tip;
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return -1;
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}
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*ip = tip;
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}
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NTOHS(uh->uh_dport);
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NTOHS(uh->uh_sport);
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NTOHS(uh->uh_ulen);
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if (uh->uh_ulen < sizeof(*uh)) {
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#ifdef NET_DEBUG
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if (debug)
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printf("readudp: bad udp len %d < %d\n",
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uh->uh_ulen, sizeof(*uh));
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#endif
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return -1;
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}
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n -= sizeof(*ip) + sizeof(*uh);
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return (n);
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}
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/*
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* Send a packet and wait for a reply, with exponential backoff.
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*
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* The send routine must return the actual number of bytes written.
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*
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* The receive routine can indicate success by returning the number of
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* bytes read; it can return 0 to indicate EOF; it can return -1 with a
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* non-zero errno to indicate failure; finally, it can return -1 with a
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* zero errno to indicate it isn't done yet.
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*/
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ssize_t
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sendrecv(d, sproc, sbuf, ssize, rproc, rbuf, rsize)
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register struct iodesc *d;
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register ssize_t (*sproc)(struct iodesc *, void *, size_t);
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register void *sbuf;
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register size_t ssize;
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register ssize_t (*rproc)(struct iodesc *, void *, size_t, time_t);
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register void *rbuf;
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register size_t rsize;
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{
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register ssize_t cc;
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register time_t t, tmo, tlast, tleft;
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#ifdef NET_DEBUG
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if (debug)
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printf("sendrecv: called\n");
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#endif
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tmo = MINTMO;
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tlast = tleft = 0;
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t = getsecs();
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for (;;) {
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if (tleft <= 0) {
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if (tmo == MAXTMO) {
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errno = ETIMEDOUT;
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return -1;
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}
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cc = (*sproc)(d, sbuf, ssize);
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if (cc == -1 || cc < ssize)
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panic("sendrecv: short write! (%d < %d)",
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cc, ssize);
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tleft = tmo;
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tmo <<= 1;
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if (tmo > MAXTMO)
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tmo = MAXTMO;
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tlast = t;
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}
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/* Try to get a packet and process it. */
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cc = (*rproc)(d, rbuf, rsize, tleft);
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/* Return on data, EOF or real error. */
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if (cc != -1 || errno != 0)
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return (cc);
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/* Timed out or didn't get the packet we're waiting for */
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t = getsecs();
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tleft -= t - tlast;
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tlast = t;
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}
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}
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char *
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inet_ntoa(ia)
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struct in_addr ia;
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{
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return (intoa(ia.s_addr));
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}
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/* Similar to inet_ntoa() */
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char *
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intoa(addr)
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register n_long addr;
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{
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register char *cp;
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register u_int byte;
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register int n;
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static char buf[17]; /* strlen(".255.255.255.255") + 1 */
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NTOHL(addr);
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cp = &buf[sizeof buf];
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*--cp = '\0';
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n = 4;
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do {
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byte = addr & 0xff;
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*--cp = byte % 10 + '0';
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byte /= 10;
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if (byte > 0) {
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*--cp = byte % 10 + '0';
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byte /= 10;
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if (byte > 0)
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*--cp = byte + '0';
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}
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*--cp = '.';
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addr >>= 8;
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} while (--n > 0);
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return (cp+1);
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}
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static char *
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number(s, n)
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char *s;
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int *n;
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{
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for (*n = 0; isdigit(*s); s++)
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*n = (*n * 10) + *s - '0';
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return s;
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}
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n_long
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ip_convertaddr(p)
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char *p;
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{
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#define IP_ANYADDR 0
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n_long addr = 0, n;
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if (p == (char *)0 || *p == '\0')
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return IP_ANYADDR;
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p = number(p, &n);
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addr |= (n << 24) & 0xff000000;
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if (*p == '\0' || *p++ != '.')
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return IP_ANYADDR;
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p = number(p, &n);
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addr |= (n << 16) & 0xff0000;
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if (*p == '\0' || *p++ != '.')
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return IP_ANYADDR;
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p = number(p, &n);
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addr |= (n << 8) & 0xff00;
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if (*p == '\0' || *p++ != '.')
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return IP_ANYADDR;
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p = number(p, &n);
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addr |= n & 0xff;
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if (*p != '\0')
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return IP_ANYADDR;
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return htonl(addr);
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}
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