1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* 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 (C) 2002, 2003 Red Hat, Inc. All rights reserved.
* Portions Copyright (C) 2000 David A. Hinds -- dhinds@pcmcia.sourceforge.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author(s): Jeremy Katz <katzj@redhat.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.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 "ethtool.h"
static struct ifreq ifr;
static int mdio_read(int skfd, uint16_t location)
{
struct mii_ioctl_data mii;
memset(&mii, 0, sizeof(mii));
memcpy(&mii, &ifr.ifr_data, sizeof(mii));
mii.reg_num = location;
memcpy(&ifr.ifr_data, &mii, sizeof(mii));
if (ioctl(skfd, SIOCGMIIREG, &ifr) < 0) {
#ifdef STANDALONE
fprintf(stderr, "SIOCGMIIREG on %s failed: %s\n", ifr.ifr_name,
strerror(errno));
#endif
return -1;
} else {
memcpy(&mii, &ifr.ifr_data, sizeof(mii));
}
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;
}
/* make sure interface is up and activated */
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, devname);
if (ioctl(sock, SIOCGIFFLAGS, &ifr) < 0) {
return -1;
}
ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0) {
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
|
