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Diffstat (limited to 'src/pmdas/freebsd/netif.c')
-rw-r--r--src/pmdas/freebsd/netif.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/src/pmdas/freebsd/netif.c b/src/pmdas/freebsd/netif.c
new file mode 100644
index 0000000..c19d7f3
--- /dev/null
+++ b/src/pmdas/freebsd/netif.c
@@ -0,0 +1,225 @@
+/*
+ * 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;
+}
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