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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* FreeBSD Kernel PMDA - network interface metrics
*
* Copyright (c) 2012 Ken McDonell. All Rights Reserved.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "pmapi.h"
#include "impl.h"
#include "pmda.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include "freebsd.h"
#define WARN_INIT 1
#define WARN_READ_HEAD 2
void
refresh_netif_metrics(void)
{
int i;
int sts;
unsigned long kaddr;
struct ifnethead ifnethead;
struct ifnet ifnet;
struct ifnet *ifp;
static int warn = 0; /* warn once control */
/*
* Not sure that the order of chained netif structs is invariant,
* especially if interfaces are added to the configuration after
* initial system boot ... so mark all the instances as inactive
* and re-match based on the interface name
*/
pmdaCacheOp(indomtab[NETIF_INDOM].it_indom, PMDA_CACHE_INACTIVE);
kaddr = symbols[KERN_IFNET].n_value;
if (kvmp == NULL || kaddr == 0) {
/* no network interface metrics for us today ... */
if ((warn & WARN_INIT) == 0) {
fprintf(stderr, "refresh_netif_metrics: Warning: cannot get any network interface metrics\n");
warn |= WARN_INIT;
}
return;
}
/*
* Kernel data structures for the linked list of network interface
* information.
*
* _ifnet -> struct ifnethead {
* struct ifnet *tqh_first;
* struct ifnet **tqh_last;
* ...
* }
*
* and within an ifnet struct (declared in <net/if_var.h>) we find
* the linked list maintained in if_link, the external interface
* name in if_xname[] and if_data which is a nested if_data stuct
* (declared in <net/if.h>) that contains many of the goodies we're
* after, e.g. u_char ifi_type, u_long ifi_mtu, u_long ifi_baudrate,
* u_long ifi_ipackets, u_long ifi_opackets, u_long ifi_ibytes,
* u_long ifi_obytes, etc.
*/
if (kvm_read(kvmp, kaddr, (char *)&ifnethead, sizeof(ifnethead)) != sizeof(ifnethead)) {
if ((warn & WARN_READ_HEAD) == 0) {
fprintf(stderr, "refresh_netif_metrics: Warning: kvm_read: ifnethead: %s\n", kvm_geterr(kvmp));
warn |= WARN_READ_HEAD;
}
return;
}
for (i = 0; ; i++) {
if (i == 0)
kaddr = (unsigned long)TAILQ_FIRST(&ifnethead);
else
kaddr = (unsigned long)TAILQ_NEXT(&ifnet, if_link);
if (kaddr == 0)
break;
if (kvm_read(kvmp, kaddr, (char *)&ifnet, sizeof(ifnet)) != sizeof(ifnet)) {
fprintf(stderr, "refresh_netif_metrics: Error: kvm_read: ifnet[%d]: %s\n", i, kvm_geterr(kvmp));
return;
}
/* skip network interfaces that are not interesting ... */
if (strcmp(ifnet.if_xname, "lo0") == 0)
continue;
sts = pmdaCacheLookupName(indomtab[NETIF_INDOM].it_indom, ifnet.if_xname, NULL, (void **)&ifp);
if (sts == PMDA_CACHE_ACTIVE) {
fprintf(stderr, "refresh_netif_metrics: Warning: duplicate name (%s) in network interface indom\n", ifnet.if_xname);
continue;
}
else if (sts == PMDA_CACHE_INACTIVE) {
/* reactivate an existing entry */
pmdaCacheStore(indomtab[NETIF_INDOM].it_indom, PMDA_CACHE_ADD, ifnet.if_xname, (void *)ifp);
}
else {
/* new entry */
ifp = (struct ifnet *)malloc(sizeof(*ifp));
if (ifp == NULL) {
fprintf(stderr, "Error: struct ifnet alloc failed for network interface \"%s\"\n", ifnet.if_xname);
__pmNoMem("refresh_netif_metrics", sizeof(*ifp), PM_FATAL_ERR);
/*NOTREACHED*/
}
pmdaCacheStore(indomtab[NETIF_INDOM].it_indom, PMDA_CACHE_ADD, ifnet.if_xname, (void *)ifp);
}
memcpy((void *)ifp, (void *)&ifnet, sizeof(*ifp));
}
}
int
do_netif_metrics(pmdaMetric *mdesc, unsigned int inst, pmAtomValue *atom)
{
struct ifnet *ifp;
int sts = 0;
if (inst != PM_IN_NULL) {
/*
* per-network interface metrics
*/
sts = pmdaCacheLookup(indomtab[NETIF_INDOM].it_indom, inst, NULL, (void **)&ifp);
if (sts == PMDA_CACHE_ACTIVE) {
sts = 1;
/* cluster and domain already checked, just need item ... */
switch (pmid_item(mdesc->m_desc.pmid)) {
case 0: /* network.interface.mtu */
atom->ul = (__uint32_t)ifp->if_data.ifi_mtu;
break;
case 1: /* network.interface.up */
atom->ul = (ifp->if_flags & IFF_UP) == IFF_UP;
break;
case 2: /* network.interface.baudrate */
atom->ull = ifp->if_data.ifi_baudrate;
break;
case 3: /* network.interface.in.bytes */
atom->ull = ifp->if_data.ifi_ibytes;
break;
case 4: /* network.interface.in.packets */
atom->ull = ifp->if_data.ifi_ipackets;
break;
case 5: /* network.interface.in.mcasts */
atom->ull = ifp->if_data.ifi_imcasts;
break;
case 6: /* network.interface.in.errors */
atom->ull = ifp->if_data.ifi_ierrors;
break;
case 7: /* network.interface.in.drops */
atom->ull = ifp->if_data.ifi_iqdrops;
break;
case 8: /* network.interface.out.bytes */
atom->ull = ifp->if_data.ifi_obytes;
break;
case 9: /* network.interface.out.packets */
atom->ull = ifp->if_data.ifi_opackets;
break;
case 10: /* network.interface.out.mcasts */
atom->ull = ifp->if_data.ifi_omcasts;
break;
case 11: /* network.interface.out.errors */
atom->ull = ifp->if_data.ifi_oerrors;
break;
case 12: /* network.interface.out.collisions */
atom->ull = ifp->if_data.ifi_collisions;
break;
case 13: /* network.interface.total.bytes */
atom->ull = ifp->if_data.ifi_ibytes + ifp->if_data.ifi_obytes;
break;
case 14: /* network.interface.total.packets */
atom->ull = ifp->if_data.ifi_ipackets + ifp->if_data.ifi_opackets;
break;
case 15: /* network.interface.total.mcasts */
atom->ull = ifp->if_data.ifi_imcasts + ifp->if_data.ifi_omcasts;
break;
case 16: /* network.interface.total.errors */
atom->ull = ifp->if_data.ifi_ierrors + ifp->if_data.ifi_oerrors;
break;
default:
sts = PM_ERR_PMID;
break;
}
}
else
sts = 0;
}
return sts;
}
|
