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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1991-2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* udp.c, Code implementing the UDP internet protocol.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <socket_impl.h>
#include <socket_inet.h>
#include <sys/salib.h>
#include <sys/socket.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include "udp_inet.h"
#include "ipv4.h"
#include "ipv4_impl.h"
#include "mac.h"
#include "mac_impl.h"
#include "v4_sum_impl.h"
#include <sys/bootdebug.h>
/* Checksum all architectures */
static int udp_cksum_flag = TRUE; /* checksum on if set */
/*
* Initialize the udp-specific parts of a socket.
*/
void
udp_socket_init(struct inetboot_socket *isp)
{
isp->type = INETBOOT_DGRAM;
isp->proto = IPPROTO_UDP;
isp->input[TRANSPORT_LVL] = udp_input;
isp->output[TRANSPORT_LVL] = udp_output;
isp->close[TRANSPORT_LVL] = NULL;
isp->headerlen[TRANSPORT_LVL] = udp_header_len;
isp->ports = udp_ports;
}
/*
* Return the size of an UDP header
*/
/* ARGSUSED */
int
udp_header_len(struct inetgram *igm)
{
return (sizeof (struct udphdr));
}
/*
* Return the requested port number in network order.
*/
in_port_t
udp_ports(uint16_t *udphp, enum Ports request)
{
if (request == SOURCE)
return (((struct udphdr *)udphp)->uh_sport);
return (((struct udphdr *)udphp)->uh_dport);
}
/*
* Process the IPv4 datagram that IPv4 has given us. We:
*
* 1) Checksum the datagram if checksum is turned on.
* 2) Strip the udp header from the inetgram.
* 3) Return the number of TRANSPORT frames for success, -1 if a
* failure occurred.
*
* Arguments: index: index into the open socket table, ip is the inetgram
* we got from IPv4, which will contain the udp header and all the data.
*/
int
udp_input(int index)
{
int frames = 0, header_len;
struct inetgram *igp, *ugp = NULL;
struct udphdr *udphp;
mblk_t *mp;
#ifdef DEBUG
printf("udp_input(%d) ###############################\n", index);
#endif
while ((igp = sockets[index].inq) != NULL) {
if (igp->igm_level != TRANSPORT_LVL) {
#ifdef DEBUG
printf("udp_input(%d): level %d datagram discarded.\n",
index, igp->igm_level);
#endif /* DEBUG */
del_gram(&sockets[index].inq, igp, TRUE);
continue;
}
mp = igp->igm_mp;
udphp = (struct udphdr *)(mp->b_rptr +
IPH_HDR_LENGTH(mp->b_rptr));
header_len = (sockets[index].headerlen[TRANSPORT_LVL])(NULL);
mp->b_rptr = ((unsigned char *)udphp) + header_len;
mp->b_wptr = ((unsigned char *)udphp) + ntohs(udphp->uh_ulen);
/* generate checksum */
if (udp_cksum_flag && udphp->uh_sum != 0) {
if (udp_chksum(udphp, &igp->igm_saddr.sin_addr,
&igp->igm_target, sockets[index].proto) != 0) {
dprintf("udp_input(%d): bad udp chksum "
"from %s.\n", index,
inet_ntoa(igp->igm_saddr.sin_addr));
del_gram(&sockets[index].inq, igp, TRUE);
continue;
}
}
/* validate port number */
if (sockets[index].bind.sin_port != udphp->uh_dport) {
dprintf("udp_input(%d): Unexpected port number: "
"%d != %d from %s.\n", index,
ntohs(udphp->uh_dport), ntohs(
sockets[index].bind.sin_port),
inet_ntoa(igp->igm_saddr.sin_addr));
del_gram(&sockets[index].inq, igp, TRUE);
continue;
}
igp->igm_level = APP_LVL;
del_gram(&sockets[index].inq, igp, FALSE);
add_grams(&ugp, igp);
frames++;
}
add_grams(&sockets[index].inq, ugp);
return (frames);
}
/*
* Create a UDP datagram given the data and sockaddr_in we got from sendto().
* We will calculate the checksum if checksumming is turned on, and fill in
* appropriate length and port fields. We convert the inetgram from a
* block of data into a udp datagram... Returns the number of bytes contained
* in the udp datagram (including header).
*
* Arguments: index: index into the open socket table, ogp is the inetgram
* we got from sendto(), which will contain just the data and sockaddr_in.
*/
int
udp_output(int index, struct inetgram *ogp)
{
struct udphdr *udphp;
mblk_t *mp;
#ifdef DEBUG
printf("udp_output(%d): 0x%x, %d\n", index, ogp->igm_mp,
ogp->igm_mp->b_wptr - ogp->igm_mp->b_rptr);
#endif /* DEBUG */
mp = ogp->igm_mp;
mp->b_rptr -= sizeof (struct udphdr);
udphp = (struct udphdr *)(mp->b_rptr);
udphp->uh_dport = ogp->igm_saddr.sin_port;
if (sockets[index].bound)
udphp->uh_sport = sockets[index].bind.sin_port;
else
udphp->uh_sport = ogp->igm_saddr.sin_port;
udphp->uh_ulen = htons(mp->b_wptr - mp->b_rptr);
udphp->uh_sum = 0;
if (udp_cksum_flag) {
udphp->uh_sum = udp_chksum(udphp, &sockets[index].bind.sin_addr,
&ogp->igm_saddr.sin_addr, sockets[index].proto);
}
ogp->igm_level = NETWORK_LVL;
return (0);
}
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