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/*
* linkdetect.c - simple link detection
*
* pulls code from mii-tool.c in net-toools and ethtool so
* that we can do everything that jgarzik says we should check
*
* Copyright 2002,2003 Red Hat, Inc.
* Portions Copyright 2000 David A. Hinds -- dhinds@pcmcia.sourceforge.org
*
* Jeremy Katz <katzj@redhat.com>
*
* This software may be freely redistributed under the terms of the GNU
* general public license.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <net/if.h>
#include <linux/sockios.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include "net.h"
static struct ifreq ifr;
static int mdio_read(int skfd, int location)
{
void *data = &ifr.ifr_data;
struct mii_ioctl_data *mii = data;
mii->reg_num = location;
if (ioctl(skfd, SIOCGMIIREG, &ifr) < 0) {
#ifdef STANDALONE
fprintf(stderr, "SIOCGMIIREG on %s failed: %s\n", ifr.ifr_name,
strerror(errno));
#endif
return -1;
}
return mii->val_out;
}
/* we don't need writing right now */
#if 0
static void mdio_write(int skfd, int location, int value)
{
struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&ifr.ifr_data;
mii->reg_num = location;
mii->val_in = value;
if (ioctl(skfd, SIOCSMIIREG, &ifr) < 0) {
#ifdef STANDALONE
fprintf(stderr, "SIOCSMIIREG on %s failed: %s\n", ifr.ifr_name,
strerror(errno));
#endif
}
}
#endif
static int get_mii_link_status(int sock) {
int i, mii_val[32];
if (ioctl(sock, SIOCGMIIPHY, &ifr) < 0) {
if (errno != ENODEV)
#ifdef STANDALONE
fprintf(stderr, "SIOCGMIIPHY on '%s' failed: %s\n",
ifr.ifr_name, strerror(errno));
#endif
return -1;
}
/* Some bits in the BMSR are latched, but we can't rely on being
the only reader, so only the current values are meaningful */
mdio_read(sock, MII_BMSR);
for (i = 0; i < 8; i++)
mii_val[i] = mdio_read(sock, i);
if (mii_val[MII_BMCR] == 0xffff) {
#ifdef STANDALONE
fprintf(stderr, " No MII transceiver present!.\n");
#endif
return -1;
}
if (mii_val[MII_BMSR] & BMSR_LSTATUS)
return 1;
else
return 0;
}
static int get_ethtool_link_status(int sock) {
struct ethtool_value edata;
int rc;
edata.cmd = ETHTOOL_GLINK;
ifr.ifr_data = (caddr_t)&edata;
rc = ioctl(sock, SIOCETHTOOL, &ifr);
if (rc == 0) {
return edata.data;
} else if (errno != EOPNOTSUPP) {
#ifdef STANDALONE
fprintf(stderr, "Cannot get link status (%d): %s\n", errno, strerror(errno));
#endif
}
return -1;
}
int get_link_status(char * devname) {
int sock, rc;
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
#ifdef STANDALONE
fprintf(stderr, "Error creating socket: %s\n", strerror(errno));
#endif
return -1;
}
/* Setup our control structures. */
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, devname);
/* check for link with both ethtool and mii registers. ethtool is
* supposed to be the One True Way (tm), but it seems to not work
* with much yet :/ */
rc = get_ethtool_link_status(sock);
#ifdef STANDALONE
printf("ethtool link status of %s is: %d\n", devname, rc);
#endif
if (rc == 1) {
close(sock);
return 1;
}
rc = get_mii_link_status(sock);
#ifdef STANDALONE
printf("MII link status of %s is: %d\n", devname, rc);
#endif
if (rc == 1) {
close(sock);
return 1;
}
return 0;
}
#ifdef STANDALONE
/* hooray for stupid test programs! */
int main(int argc, char **argv) {
char * dev;
if (argc >= 2)
dev = argv[1];
else
dev = strdup("eth0");
printf("link status of %s is %d\n", dev, get_link_status(dev));
return 0;
}
#endif
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