324 lines
8.6 KiB
C
324 lines
8.6 KiB
C
/*
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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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* from @(#) 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/types.h>
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#include <sys/socket.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 <errno.h>
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#include "salibc.h"
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#include "netboot.h"
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#include "netif.h"
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/* Caller must leave room for ethernet, ip and udp headers in front!! */
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int
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sendudp(d, buf, len)
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register struct iodesc *d;
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register void *buf;
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register int len;
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{
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register int 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 DEBUG
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if (debug)
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printf("sendudp: called\n");
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#endif
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uh = ((struct udphdr *)buf) - 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.s_addr = htonl(d->myip);
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ip->ip_dst.s_addr = htonl(d->destip);
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ip->ip_sum = in_cksum(ip, sizeof(*ip)); /* short, but special */
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uh->uh_sport = htons(d->myport);
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uh->uh_dport = htons(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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mask == 0 || SAMENET(ip->ip_src.s_addr, ip->ip_dst.s_addr, mask))
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ea = arpwhohas(d, ip->ip_dst.s_addr);
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else
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ea = arpwhohas(d, htonl(gateip));
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cc = sendether(d, ip, len, ea, ETHERTYPE_IP);
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if (cc < 0)
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return (cc);
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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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/* Caller must leave room for ethernet header in front!! */
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int
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sendether(d, buf, len, dea, etype)
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register struct iodesc *d;
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register void *buf;
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register int len;
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register u_char *dea;
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register int etype;
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{
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register struct ether_header *eh;
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#ifdef DEBUG
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if (debug)
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printf("sendether: called\n");
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#endif
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eh = ((struct ether_header *)buf) - 1;
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len += ETHER_SIZE;
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MACPY(d->myea, eh->ether_shost); /* by byte */
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MACPY(dea, eh->ether_dhost); /* by byte */
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eh->ether_type = htons(etype);
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return (ethernet_put(d, eh, len) - ETHER_SIZE);
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}
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/* Check that packet is a valid udp packet for us */
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void *
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checkudp(d, pkt, lenp)
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register struct iodesc *d;
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register void *pkt;
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register int *lenp;
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{
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register int hlen, len;
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register struct ether_header *eh;
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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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#ifdef DEBUG
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if (debug)
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printf("checkudp: called\n");
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#endif
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eh = pkt;
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ip = (struct ip *)(eh + 1);
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uh = (struct udphdr *)(ip + 1);
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/* Must be to us */
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if (bcmp(d->myea, eh->ether_dhost, 6) != 0 && /* by byte */
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bcmp(bcea, eh->ether_dhost, 6) != 0) /* by byte */
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return (NULL);
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/* And ip */
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if (ntohs(eh->ether_type) != ETHERTYPE_IP)
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return (NULL);
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/* Check ip header */
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if (ip->ip_v != IPVERSION || ip->ip_p != IPPROTO_UDP) /* half char */
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return (NULL);
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hlen = ip->ip_hl << 2;
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if (hlen < sizeof(*ip) || in_cksum(ip, hlen) != 0)
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return (NULL);
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NTOHS(ip->ip_len);
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if (*lenp - sizeof(*eh) < ip->ip_len)
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return (NULL);
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if (d->myip && ntohl(ip->ip_dst.s_addr) != d->myip)
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return (NULL);
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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,
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*lenp - (sizeof(*eh) + hlen));
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ip->ip_len = sizeof(*ip);
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*lenp -= hlen - sizeof(*ip);
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}
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if (ntohs(uh->uh_dport) != d->myport)
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return (NULL);
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if (uh->uh_sum) {
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len = ntohs(uh->uh_ulen);
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if (len > RECV_SIZE - (sizeof(*eh) + sizeof(*ip))) {
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printf("checkudp: huge packet, udp len %d\n", len);
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return (NULL);
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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, len + sizeof(*ip)) != 0) {
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*ip = tip;
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return (NULL);
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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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return (NULL);
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*lenp -= sizeof(*eh) + sizeof(*ip) + sizeof(*uh);
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return (uh + 1);
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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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int
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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 int (*sproc)(struct iodesc *, void *, int);
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register void *sbuf;
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register int ssize;
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register int (*rproc)(struct iodesc *, void *, int);
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register void *rbuf;
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register int rsize;
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{
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register int cc;
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register time_t t, tmo, tlast, tleft;
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#ifdef 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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cc = (*sproc)(d, sbuf, ssize);
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if (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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cc = ethernet_get(d, rbuf, rsize, tleft);
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if (cc >= 0) {
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/* Got a packet, process it */
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cc = (*rproc)(d, rbuf, cc);
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/* Return on data, EOF or real error */
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if (cc >= 0 || errno != 0)
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return (cc);
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}
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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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int ethernet_get(desc, pkt, len, timeout)
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struct iodesc *desc;
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void *pkt;
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int len;
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time_t timeout;
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{
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int val;
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val = netif_get(desc, pkt, len, timeout);
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#ifdef DEBUG
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if (debug)
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printf("ethernet_get: received %d\n", val);
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#endif
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return val;
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}
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int ethernet_put(desc, pkt, len)
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struct iodesc *desc;
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void *pkt;
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int len;
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{
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int count, val;
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#ifdef DEBUG
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if (debug) {
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struct ether_header *eh;
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printf("ethernet_put: called\n");
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eh = pkt;
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printf("ethernet_put: ether_dhost %s\n",
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ether_sprintf(eh->ether_dhost));
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printf("ethernet_put: ether_shost %s\n",
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ether_sprintf(eh->ether_shost));
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printf("ethernet_put: ether_type %x\n", eh->ether_type);
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}
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#endif
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val = netif_put(desc, pkt, len);
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return val;
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}
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