diff options
Diffstat (limited to 'stand/libsa/udp.c')
| -rw-r--r-- | stand/libsa/udp.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/stand/libsa/udp.c b/stand/libsa/udp.c new file mode 100644 index 0000000..8e52f29 --- /dev/null +++ b/stand/libsa/udp.c @@ -0,0 +1,180 @@ +/* Taken from $NetBSD: net.c,v 1.20 1997/12/26 22:41:30 scottr 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. + * 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/cdefs.h> +__FBSDID("$FreeBSD$"); + +#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/in_pcb.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" + +/* Caller must leave room for ethernet, ip and udp headers in front!! */ +ssize_t +sendudp(struct iodesc *d, void *pkt, size_t len) +{ + ssize_t cc; + struct udpiphdr *ui; + struct udphdr *uh; + +#ifdef NET_DEBUG + if (debug) { + printf("sendudp: d=%lx called.\n", (long)d); + if (d) { + printf("saddr: %s:%d", + inet_ntoa(d->myip), ntohs(d->myport)); + printf(" daddr: %s:%d\n", + inet_ntoa(d->destip), ntohs(d->destport)); + } + } +#endif + + ui = (struct udpiphdr *)pkt - 1; + bzero(ui, sizeof(*ui)); + + uh = (struct udphdr *)pkt - 1; + len += sizeof(*uh); + + uh->uh_sport = d->myport; + uh->uh_dport = d->destport; + uh->uh_ulen = htons(len); + + ui->ui_pr = IPPROTO_UDP; + ui->ui_len = uh->uh_ulen; + ui->ui_src = d->myip; + ui->ui_dst = d->destip; + +#ifndef UDP_NO_CKSUM + uh->uh_sum = in_cksum(ui, len + sizeof (struct ip)); +#endif + + cc = sendip(d, uh, len, IPPROTO_UDP); + if (cc == -1) + return (-1); + if (cc != len) + panic("sendudp: bad write (%zd != %zd)", cc, len); + return (cc - sizeof(*uh)); +} + +/* + * Receive a UDP packet and validate it is for us. + */ +ssize_t +readudp(struct iodesc *d, void **pkt, void **payload, time_t tleft) +{ + ssize_t n; + struct udphdr *uh; + void *ptr; + +#ifdef NET_DEBUG + if (debug) + printf("readudp: called\n"); +#endif + + uh = NULL; + ptr = NULL; + n = readip(d, &ptr, (void **)&uh, tleft, IPPROTO_UDP); + if (n == -1 || n < sizeof(*uh) || n != ntohs(uh->uh_ulen)) { + free(ptr); + return (-1); + } + + if (uh->uh_dport != d->myport) { +#ifdef NET_DEBUG + if (debug) + printf("readudp: bad dport %d != %d\n", + d->myport, ntohs(uh->uh_dport)); +#endif + free(ptr); + return (-1); + } + +#ifndef UDP_NO_CKSUM + if (uh->uh_sum) { + struct udpiphdr *ui; + struct ip *ip; + struct ip tip; + + n = ntohs(uh->uh_ulen) + sizeof(*ip); + + /* Check checksum (must save and restore ip header) */ + ip = (struct ip *)uh - 1; + tip = *ip; + ui = (struct udpiphdr *)ip; + bzero(&ui->ui_x1, sizeof(ui->ui_x1)); + ui->ui_len = uh->uh_ulen; + if (in_cksum(ui, n) != 0) { +#ifdef NET_DEBUG + if (debug) + printf("readudp: bad cksum\n"); +#endif + free(ptr); + return (-1); + } + *ip = tip; + } +#endif + if (ntohs(uh->uh_ulen) < sizeof(*uh)) { +#ifdef NET_DEBUG + if (debug) + printf("readudp: bad udp len %d < %d\n", + ntohs(uh->uh_ulen), (int)sizeof(*uh)); +#endif + free(ptr); + return (-1); + } + + n = (n > (ntohs(uh->uh_ulen) - sizeof(*uh))) ? + ntohs(uh->uh_ulen) - sizeof(*uh) : n; + *pkt = ptr; + *payload = (void *)((uintptr_t)uh + sizeof(*uh)); + return (n); +} |
