bgpd: Add code to dump the forthcoming mac hash

Add a bit of code that allows us to dump the mac hash.  Future
commits will actually add entries to the mac hash and then operate
on it.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

bgpd/bgp_mac.c

@@ -0,0 +1,99 @@
+/*
+ * BGPd - Mac hash code
+ * Copyright (C) 2018 Cumulus Networks, Inc.
+ *               Donald Sharp
+ *
+ * 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; 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 <jhash.h>
+#include <hash.h>
+#include <prefix.h>
+#include <memory.h>
+
+#include "bgpd/bgpd.h"
+#include "bgpd/bgp_mac.h"
+#include "bgpd/bgp_memory.h"
+#include "bgpd/bgp_route.h"
+#include "bgpd/bgp_packet.h"
+#include "bgpd/bgp_debug.h"
+
+DEFINE_MTYPE_STATIC(BGPD, BSM, "Mac Hash Entry");
+
+struct bgp_self_mac {
+	struct ethaddr macaddr;
+	struct list *ifp_list;
+};
+
+static unsigned int bgp_mac_hash_key_make(void *data)
+{
+	struct bgp_self_mac *bsm = data;
+
+	return jhash(&bsm->macaddr, ETH_ALEN, 0xa5a5dead);
+}
+
+static bool bgp_mac_hash_cmp(const void *d1, const void *d2)
+{
+	const struct bgp_self_mac *bsm1 = d1;
+	const struct bgp_self_mac *bsm2 = d2;
+
+	if (memcmp(&bsm1->macaddr, &bsm2->macaddr, ETH_ALEN) == 0)
+		return true;
+
+	return false;
+}
+
+void bgp_mac_init(void)
+{
+	bm->self_mac_hash = hash_create(bgp_mac_hash_key_make, bgp_mac_hash_cmp,
+					"BGP MAC Hash");
+}
+
+static void bgp_mac_hash_free(void *data)
+{
+	struct bgp_self_mac *bsm = data;
+
+	list_delete(&bsm->ifp_list);
+	XFREE(MTYPE_BSM, bsm);
+}
+
+void bgp_mac_finish(void)
+{
+	hash_clean(bm->self_mac_hash, bgp_mac_hash_free);
+	hash_free(bm->self_mac_hash);
+}
+
+static void bgp_mac_show_mac_entry(struct hash_backet *backet, void *arg)
+{
+	struct vty *vty = arg;
+	struct bgp_self_mac *bsm = backet->data;
+	struct listnode *node;
+	char *name;
+	char buf_mac[ETHER_ADDR_STRLEN];
+
+	vty_out(vty, "Mac Address: %s ",
+		prefix_mac2str(&bsm->macaddr, buf_mac, sizeof(buf_mac)));
+
+	for (ALL_LIST_ELEMENTS_RO(bsm->ifp_list, node, name))
+		vty_out(vty, "%s ", name);
+
+	vty_out(vty, "\n");
+}
+
+void bgp_mac_dump_table(struct vty *vty)
+{
+	hash_iterate(bm->self_mac_hash, bgp_mac_show_mac_entry, vty);
+}

bgpd/bgp_mac.h

@@ -0,0 +1,27 @@
+/*
+ * BGPd - Mac hash header
+ * Copyright (C) 2018 Cumulus Networks, Inc.
+ *               Donald Sharp
+ *
+ * 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; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef __BGP_MAC_H__
+#define __BGP_MAC_H__
+
+void bgp_mac_init(void);
+void bgp_mac_finish(void);
+
+void bgp_mac_dump_table(struct vty *vty);
+#endif

bgpd/bgp_vty.c

@@ -37,6 +37,7 @@
 #include "frrstr.h"
 
 #include "bgpd/bgpd.h"
+#include "bgpd/bgp_attr_evpn.h"
 #include "bgpd/bgp_advertise.h"
 #include "bgpd/bgp_attr.h"
 #include "bgpd/bgp_aspath.h"
@@ -62,6 +63,7 @@
 #include "bgpd/bgp_io.h"
 #include "bgpd/bgp_evpn.h"
 #include "bgpd/bgp_addpath.h"
+#include "bgpd/bgp_mac.h"
 
 static struct peer_group *listen_range_exists(struct bgp *bgp,
 					      struct prefix *range, int exact);
@@ -7576,6 +7578,18 @@ DEFUN (show_bgp_vrfs,
 	return CMD_SUCCESS;
 }
 
+DEFUN (show_bgp_mac_hash,
+       show_bgp_mac_hash_cmd,
+       "show bgp mac hash",
+       SHOW_STR
+       BGP_STR
+       "Mac Address\n"
+       "Mac Address database\n")
+{
+	bgp_mac_dump_table(vty);
+
+	return CMD_SUCCESS;
+}
 
 static void show_tip_entry(struct hash_backet *backet, void *args)
 {
@@ -13835,6 +13849,8 @@ void bgp_vty_init(void)
 	/* "show bgp martian next-hop" */
 	install_element(VIEW_NODE, &show_bgp_martian_nexthop_db_cmd);
 
+	install_element(VIEW_NODE, &show_bgp_mac_hash_cmd);
+
 	/* "show [ip] bgp views" commands. */
 	install_element(VIEW_NODE, &show_bgp_views_cmd);
 

bgpd/bgpd.c

@@ -87,6 +87,7 @@
 #include "bgpd/bgp_pbr.h"
 #include "bgpd/bgp_addpath.h"
 #include "bgpd/bgp_evpn_private.h"
+#include "bgpd/bgp_mac.h"
 
 DEFINE_MTYPE_STATIC(BGPD, PEER_TX_SHUTDOWN_MSG, "Peer shutdown message (TX)");
 DEFINE_MTYPE_STATIC(BGPD, BGP_EVPN_INFO, "BGP EVPN instance information");
@@ -7775,6 +7776,7 @@ void bgp_master_init(struct thread_master *master)
 
 	bgp_process_queue_init();
 
+	bgp_mac_init();
 	/* init the rd id space.
 	   assign 0th index in the bitfield,
 	   so that we start with id 1
@@ -7964,4 +7966,5 @@ void bgp_terminate(void)
 	if (bm->t_rmap_update)
 		BGP_TIMER_OFF(bm->t_rmap_update);
 
+	bgp_mac_finish();
 }

bgpd/bgpd.h

@@ -122,6 +122,9 @@ struct bgp_master {
 	/* Listener address */
 	char *address;
 
+	/* The Mac table */
+	struct hash *self_mac_hash;
+
 	/* BGP start time.  */
 	time_t start_time;
 

bgpd/subdir.am

@@ -72,6 +72,7 @@ bgpd_libbgp_a_SOURCES = \
 	bgpd/bgp_label.c \
 	bgpd/bgp_labelpool.c \
 	bgpd/bgp_lcommunity.c \
+	bgpd/bgp_mac.c \
 	bgpd/bgp_memory.c \
 	bgpd/bgp_mpath.c \
 	bgpd/bgp_mplsvpn.c \
@@ -145,6 +146,7 @@ noinst_HEADERS += \
 	bgpd/bgp_label.h \
 	bgpd/bgp_labelpool.h \
 	bgpd/bgp_lcommunity.h \
+	bgpd/bgp_mac.h \
 	bgpd/bgp_memory.h \
 	bgpd/bgp_mpath.h \
 	bgpd/bgp_mplsvpn.h \