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/in_pcb.h>
52 #include <netinet/ip.h>
53 #include <netinet/ip_var.h>
54 #include <netinet/udp.h>
55 #include <netinet/udp_var.h>
60 /* Caller must leave room for ethernet, ip and udp headers in front!! */
62 sendudp(struct iodesc *d, void *pkt, size_t len)
70 printf("sendudp: d=%lx called.\n", (long)d);
72 printf("saddr: %s:%d",
73 inet_ntoa(d->myip), ntohs(d->myport));
74 printf(" daddr: %s:%d\n",
75 inet_ntoa(d->destip), ntohs(d->destport));
80 ui = (struct udpiphdr *)pkt - 1;
81 bzero(ui, sizeof(*ui));
83 uh = (struct udphdr *)pkt - 1;
86 uh->uh_sport = d->myport;
87 uh->uh_dport = d->destport;
88 uh->uh_ulen = htons(len);
90 ui->ui_pr = IPPROTO_UDP;
91 ui->ui_len = uh->uh_ulen;
93 ui->ui_dst = d->destip;
96 uh->uh_sum = in_cksum(ui, len + sizeof (struct ip));
99 cc = sendip(d, uh, len, IPPROTO_UDP);
103 panic("sendudp: bad write (%zd != %zd)", cc, len);
104 return (cc - sizeof(*uh));
108 * Receive a UDP packet and validate it is for us.
111 readudp(struct iodesc *d, void **pkt, void **payload, time_t tleft)
119 printf("readudp: called\n");
124 n = readip(d, &ptr, (void **)&uh, tleft, IPPROTO_UDP);
125 if (n == -1 || n < sizeof(*uh) || n != ntohs(uh->uh_ulen)) {
130 if (uh->uh_dport != d->myport) {
133 printf("readudp: bad dport %d != %d\n",
134 d->myport, ntohs(uh->uh_dport));
146 n = ntohs(uh->uh_ulen) + sizeof(*ip);
148 /* Check checksum (must save and restore ip header) */
149 ip = (struct ip *)uh - 1;
151 ui = (struct udpiphdr *)ip;
152 bzero(&ui->ui_x1, sizeof(ui->ui_x1));
153 ui->ui_len = uh->uh_ulen;
154 if (in_cksum(ui, n) != 0) {
157 printf("readudp: bad cksum\n");
165 if (ntohs(uh->uh_ulen) < sizeof(*uh)) {
168 printf("readudp: bad udp len %d < %d\n",
169 ntohs(uh->uh_ulen), (int)sizeof(*uh));
175 n = (n > (ntohs(uh->uh_ulen) - sizeof(*uh))) ?
176 ntohs(uh->uh_ulen) - sizeof(*uh) : n;
178 *payload = (void *)((uintptr_t)uh + sizeof(*uh));