1 /* Taken from $NetBSD: net.c,v 1.20 1997/12/26 22:41:30 scottr Exp $ */
4 * Copyright (c) 1992 Regents of the University of California.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/socket.h>
47 #include <netinet/in.h>
48 #include <netinet/if_ether.h>
49 #include <netinet/in_systm.h>
51 #include <netinet/ip.h>
52 #include <netinet/ip_var.h>
53 #include <netinet/udp.h>
54 #include <netinet/udp_var.h>
59 /* Caller must leave room for ethernet, ip and udp headers in front!! */
61 sendudp(struct iodesc *d, void *pkt, size_t len)
69 printf("sendudp: d=%lx called.\n", (long)d);
71 printf("saddr: %s:%d",
72 inet_ntoa(d->myip), ntohs(d->myport));
73 printf(" daddr: %s:%d\n",
74 inet_ntoa(d->destip), ntohs(d->destport));
79 ui = (struct udpiphdr *)pkt - 1;
80 bzero(ui, sizeof(*ui));
82 uh = (struct udphdr *)pkt - 1;
85 uh->uh_sport = d->myport;
86 uh->uh_dport = d->destport;
87 uh->uh_ulen = htons(len);
89 ui->ui_pr = IPPROTO_UDP;
90 ui->ui_len = uh->uh_ulen;
92 ui->ui_dst = d->destip;
95 uh->uh_sum = in_cksum(ui, len + sizeof (struct ip));
98 cc = sendip(d, uh, len, IPPROTO_UDP);
102 panic("sendudp: bad write (%zd != %zd)", cc, len);
103 return (cc - sizeof(*uh));
107 * Receive a UDP packet and validate it is for us.
110 readudp(struct iodesc *d, void **pkt, void **payload, time_t tleft)
118 printf("readudp: called\n");
123 n = readip(d, &ptr, (void **)&uh, tleft, IPPROTO_UDP);
124 if (n == -1 || n < sizeof(*uh) || n != ntohs(uh->uh_ulen)) {
129 if (uh->uh_dport != d->myport) {
132 printf("readudp: bad dport %d != %d\n",
133 d->myport, ntohs(uh->uh_dport));
145 n = ntohs(uh->uh_ulen) + sizeof(*ip);
147 /* Check checksum (must save and restore ip header) */
148 ip = (struct ip *)uh - 1;
150 ui = (struct udpiphdr *)ip;
151 bzero(&ui->ui_x1, sizeof(ui->ui_x1));
152 ui->ui_len = uh->uh_ulen;
153 if (in_cksum(ui, n) != 0) {
156 printf("readudp: bad cksum\n");
164 if (ntohs(uh->uh_ulen) < sizeof(*uh)) {
167 printf("readudp: bad udp len %d < %d\n",
168 ntohs(uh->uh_ulen), (int)sizeof(*uh));
174 n = (n > (ntohs(uh->uh_ulen) - sizeof(*uh))) ?
175 ntohs(uh->uh_ulen) - sizeof(*uh) : n;
177 *payload = (void *)((uintptr_t)uh + sizeof(*uh));