bgpd: add MPLSVPN SNMP boilerplate

Add infrastructure for mplsvpn MIB (RFC-4382) and the top level
ScalarGroup.

Signed-off-by: Pat Ruddy <pat@voltanet.io>

4 files changed, 308 insertions, 1 deletions

diff --git a/bgpd/bgp_mplsvpn_snmp.c b/bgpd/bgp_mplsvpn_snmp.c
new file mode 100644
index 0000000000..0a8d39cb95
--- /dev/null
+++ b/bgpd/bgp_mplsvpn_snmp.c
@@ -0,0 +1,283 @@
+/* MPLS/BGP L3VPN MIB
+ * Copyright (C) 2020 Volta Networks Inc
+ *
+ * This file is part of FRR.
+ *
+ * FRRouting 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, or (at your option) any
+ * later version.
+ *
+ * FRRouting 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; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+
+#include <net-snmp/net-snmp-config.h>
+#include <net-snmp/net-snmp-includes.h>
+
+#include "if.h"
+#include "log.h"
+#include "prefix.h"
+#include "command.h"
+#include "thread.h"
+#include "smux.h"
+#include "filter.h"
+#include "hook.h"
+#include "libfrr.h"
+#include "version.h"
+
+#include "bgpd/bgpd.h"
+#include "bgpd/bgp_mplsvpn.h"
+#include "bgpd/bgp_mplsvpn_snmp.h"
+
+#define BGP_mplsvpn_notif_enable_true 1
+#define BGP_mplsvpn_notif_enable_false 2
+
+static uint8_t bgp_mplsvpn_notif_enable = SNMP_FALSE;
+
+/* MPLSL3VPN MIB described in RFC4382 */
+#define MPLSL3VPNMIB 1, 3, 6, 1, 2, 1, 10, 166, 11
+
+/* MPLSL3VPN Scalars */
+#define MPLSL3VPNCONFIGUREDVRFS 1
+#define MPLSL3VPNACTIVEVRFS 2
+#define MPLSL3VPNCONNECTEDINTERFACES 3
+#define MPLSL3VPNNOTIFICATIONENABLE 4
+#define MPLSL3VPNCONFMAXPOSSRTS 5
+#define MPLSL3VPNVRFCONFRTEMXTHRSHTIME 6
+#define MPLSL3VPNILLLBLRCVTHRSH 7
+
+/* SNMP value hack. */
+#define INTEGER ASN_INTEGER
+#define INTEGER32 ASN_INTEGER
+#define COUNTER32 ASN_COUNTER
+#define OCTET_STRING ASN_OCTET_STR
+#define IPADDRESS ASN_IPADDRESS
+#define GAUGE32 ASN_UNSIGNED
+
+/* Declare static local variables for convenience. */
+SNMP_LOCAL_VARIABLES
+
+/* BGP-MPLS-MIB innstances */
+static oid mpls_l3vpn_oid[] = {MPLSL3VPNMIB};
+
+static uint8_t *mplsL3vpnConfiguredVrfs(struct variable *, oid[], size_t *, int,
+					size_t *, WriteMethod **);
+
+static uint8_t *mplsL3vpnActiveVrfs(struct variable *, oid[], size_t *, int,
+				    size_t *, WriteMethod **);
+
+static uint8_t *mplsL3vpnConnectedInterfaces(struct variable *, oid[], size_t *,
+					     int, size_t *, WriteMethod **);
+
+static uint8_t *mplsL3vpnNotificationEnable(struct variable *, oid[], size_t *,
+					    int, size_t *, WriteMethod **);
+
+static uint8_t *mplsL3vpnVrfConfMaxPossRts(struct variable *, oid[], size_t *,
+					   int, size_t *, WriteMethod **);
+
+static uint8_t *mplsL3vpnVrfConfRteMxThrshTime(struct variable *, oid[],
+					       size_t *, int, size_t *,
+					       WriteMethod **);
+
+static uint8_t *mplsL3vpnIllLblRcvThrsh(struct variable *, oid[], size_t *, int,
+					size_t *, WriteMethod **);
+
+static struct variable mpls_l3vpn_variables[] = {
+	/* BGP version. */
+	{MPLSL3VPNCONFIGUREDVRFS,
+	 GAUGE32,
+	 RONLY,
+	 mplsL3vpnConfiguredVrfs,
+	 3,
+	 {1, 1, 1} },
+	{MPLSL3VPNACTIVEVRFS,
+	 GAUGE32,
+	 RONLY,
+	 mplsL3vpnActiveVrfs,
+	 3,
+	 {1, 1, 2} },
+	{MPLSL3VPNCONNECTEDINTERFACES,
+	 GAUGE32,
+	 RONLY,
+	 mplsL3vpnConnectedInterfaces,
+	 3,
+	 {1, 1, 3} },
+	{MPLSL3VPNNOTIFICATIONENABLE,
+	 INTEGER,
+	 RWRITE,
+	 mplsL3vpnNotificationEnable,
+	 3,
+	 {1, 1, 4} },
+	{MPLSL3VPNCONFMAXPOSSRTS,
+	 GAUGE32,
+	 RONLY,
+	 mplsL3vpnVrfConfMaxPossRts,
+	 3,
+	 {1, 1, 5} },
+	{MPLSL3VPNVRFCONFRTEMXTHRSHTIME,
+	 GAUGE32,
+	 RONLY,
+	 mplsL3vpnVrfConfRteMxThrshTime,
+	 3,
+	 {1, 1, 6} },
+	{MPLSL3VPNILLLBLRCVTHRSH,
+	 GAUGE32,
+	 RONLY,
+	 mplsL3vpnIllLblRcvThrsh,
+	 3,
+	 {1, 1, 7} },
+
+};
+
+static uint8_t *mplsL3vpnConfiguredVrfs(struct variable *v, oid name[],
+					size_t *length, int exact,
+					size_t *var_len,
+					WriteMethod **write_method)
+{
+	struct listnode *node, *nnode;
+	struct bgp *bgp;
+	uint32_t count = 0;
+
+	if (smux_header_generic(v, name, length, exact, var_len, write_method)
+	    == MATCH_FAILED)
+		return NULL;
+
+	for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp)) {
+		if (is_bgp_vrf_mplsvpn(bgp))
+			count++;
+	}
+	return SNMP_INTEGER(count);
+}
+
+static uint8_t *mplsL3vpnActiveVrfs(struct variable *v, oid name[],
+				    size_t *length, int exact, size_t *var_len,
+				    WriteMethod **write_method)
+{
+	struct listnode *node, *nnode;
+	struct bgp *bgp;
+	uint32_t count = 0;
+
+	if (smux_header_generic(v, name, length, exact, var_len, write_method)
+	    == MATCH_FAILED)
+		return NULL;
+
+	for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp)) {
+		if (is_bgp_vrf_mplsvpn(bgp) && is_bgp_vrf_active(bgp))
+			count++;
+	}
+	return SNMP_INTEGER(count);
+}
+
+static uint8_t *mplsL3vpnConnectedInterfaces(struct variable *v, oid name[],
+					     size_t *length, int exact,
+					     size_t *var_len,
+					     WriteMethod **write_method)
+{
+	struct listnode *node, *nnode;
+	struct bgp *bgp;
+	uint32_t count = 0;
+	struct vrf *vrf;
+
+	if (smux_header_generic(v, name, length, exact, var_len, write_method)
+	    == MATCH_FAILED)
+		return NULL;
+
+	for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp)) {
+		if (is_bgp_vrf_mplsvpn(bgp)) {
+			vrf = vrf_lookup_by_name(bgp->name);
+			if (vrf == NULL)
+				continue;
+
+			count += vrf_interface_count(vrf);
+		}
+	}
+
+	return SNMP_INTEGER(count);
+}
+
+static int write_mplsL3vpnNotificationEnable(int action, uint8_t *var_val,
+					     uint8_t var_val_type,
+					     size_t var_val_len, uint8_t *statP,
+					     oid *name, size_t length)
+{
+	uint32_t intval;
+
+	zlog_debug("PJDR: %s", __func__);
+	if (var_val_type != ASN_INTEGER) {
+		return SNMP_ERR_WRONGTYPE;
+	}
+
+	if (var_val_len != sizeof(long)) {
+		return SNMP_ERR_WRONGLENGTH;
+	}
+
+	intval = *(long *)var_val;
+	bgp_mplsvpn_notif_enable = intval;
+	return SNMP_ERR_NOERROR;
+}
+
+static uint8_t *mplsL3vpnNotificationEnable(struct variable *v, oid name[],
+					    size_t *length, int exact,
+					    size_t *var_len,
+					    WriteMethod **write_method)
+{
+	if (smux_header_generic(v, name, length, exact, var_len, write_method)
+	    == MATCH_FAILED)
+		return NULL;
+
+	zlog_debug("PJDR: %s", __func__);
+	*write_method = write_mplsL3vpnNotificationEnable;
+	return SNMP_INTEGER(bgp_mplsvpn_notif_enable);
+}
+
+static uint8_t *mplsL3vpnVrfConfMaxPossRts(struct variable *v, oid name[],
+					   size_t *length, int exact,
+					   size_t *var_len,
+					   WriteMethod **write_method)
+{
+	if (smux_header_generic(v, name, length, exact, var_len, write_method)
+	    == MATCH_FAILED)
+		return NULL;
+
+	return SNMP_INTEGER(0);
+}
+
+static uint8_t *mplsL3vpnVrfConfRteMxThrshTime(struct variable *v, oid name[],
+					       size_t *length, int exact,
+					       size_t *var_len,
+					       WriteMethod **write_method)
+{
+	if (smux_header_generic(v, name, length, exact, var_len, write_method)
+	    == MATCH_FAILED)
+		return NULL;
+
+	return SNMP_INTEGER(0);
+}
+
+static uint8_t *mplsL3vpnIllLblRcvThrsh(struct variable *v, oid name[],
+					size_t *length, int exact,
+					size_t *var_len,
+					WriteMethod **write_method)
+{
+	if (smux_header_generic(v, name, length, exact, var_len, write_method)
+	    == MATCH_FAILED)
+		return NULL;
+
+	return SNMP_INTEGER(0);
+}
+
+
+void bgp_mpls_l3vpn_module_init(void)
+{
+	REGISTER_MIB("mplsL3VpnMIB", mpls_l3vpn_variables, variable,
+		     mpls_l3vpn_oid);
+}
diff --git a/bgpd/bgp_mplsvpn_snmp.h b/bgpd/bgp_mplsvpn_snmp.h
new file mode 100644
index 0000000000..21f747c8ed
--- /dev/null
+++ b/bgpd/bgp_mplsvpn_snmp.h
@@ -0,0 +1,21 @@
+/* MPLS/BGP L3VPN MIB
+ * Copyright (C) 2020 Volta Networks Inc
+ *
+ * This file is part of FRR.
+ *
+ * FRRouting 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, or (at your option) any
+ * later version.
+ *
+ * FRRouting 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; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+void bgp_mpls_l3vpn_module_init(void);
diff --git a/bgpd/bgp_snmp.c b/bgpd/bgp_snmp.c
index 303f4ca56e..76f8b8712b 100644
--- a/bgpd/bgp_snmp.c
+++ b/bgpd/bgp_snmp.c
@@ -40,6 +40,7 @@
 #include "bgpd/bgp_attr.h"
 #include "bgpd/bgp_route.h"
 #include "bgpd/bgp_fsm.h"
+#include "bgpd/bgp_mplsvpn_snmp.h"
 
 /* BGP4-MIB described in RFC1657. */
 #define BGP4MIB 1,3,6,1,2,1,15
@@ -898,6 +899,7 @@ static int bgp_snmp_init(struct thread_master *tm)
 {
 	smux_init(tm);
 	REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
+	bgp_mpls_l3vpn_module_init();
 	return 0;
 }
 
diff --git a/bgpd/subdir.am b/bgpd/subdir.am
index df1555c32a..4614363bf0 100644
--- a/bgpd/subdir.am
+++ b/bgpd/subdir.am
@@ -167,6 +167,7 @@ noinst_HEADERS += \
 	bgpd/bgp_memory.h \
 	bgpd/bgp_mpath.h \
 	bgpd/bgp_mplsvpn.h \
+	bgpd/bgp_mplsvpn_snmp.h \
 	bgpd/bgp_network.h \
 	bgpd/bgp_nexthop.h \
 	bgpd/bgp_nht.h \
@@ -218,7 +219,7 @@ bgpd_bgp_btoa_CFLAGS = $(AM_CFLAGS)
 bgpd_bgpd_LDADD = bgpd/libbgp.a $(RFPLDADD) lib/libfrr.la $(LIBCAP) $(LIBM) $(UST_LIBS)
 bgpd_bgp_btoa_LDADD = bgpd/libbgp.a $(RFPLDADD) lib/libfrr.la $(LIBCAP) $(LIBM) $(UST_LIBS)
 
-bgpd_bgpd_snmp_la_SOURCES = bgpd/bgp_snmp.c
+bgpd_bgpd_snmp_la_SOURCES = bgpd/bgp_snmp.c  bgpd/bgp_mplsvpn_snmp.c
 bgpd_bgpd_snmp_la_CFLAGS = $(WERROR) $(SNMP_CFLAGS) -std=gnu99
 bgpd_bgpd_snmp_la_LDFLAGS = -avoid-version -module -shared -export-dynamic
 bgpd_bgpd_snmp_la_LIBADD = lib/libfrrsnmp.la