bgpd: support for policy-routing context used with flowspec

BGP flowspec will be able to inject or remove policy-routing contexts,
thanks to some protocols like flowspec. This commit adds some the APIS
necessary to create/delete policy routing contexts that will be injected
then into zebra.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

bgpd/Makefile.am

@@ -87,7 +87,7 @@ libbgp_a_SOURCES = \
 	bgp_encap_tlv.c $(BGP_VNC_RFAPI_SRC) bgp_attr_evpn.c \
 	bgp_evpn.c bgp_evpn_vty.c bgp_vpn.c bgp_label.c bgp_rd.c \
 	bgp_keepalives.c bgp_io.c bgp_flowspec.c bgp_flowspec_util.c \
-	bgp_flowspec_vty.c bgp_labelpool.c
+	bgp_flowspec_vty.c bgp_labelpool.c bgp_pbr.c
 
 noinst_HEADERS = \
 	bgp_memory.h \
@@ -101,7 +101,7 @@ noinst_HEADERS = \
 	$(BGP_VNC_RFAPI_HD) bgp_attr_evpn.h bgp_evpn.h bgp_evpn_vty.h \
         bgp_vpn.h bgp_label.h bgp_rd.h bgp_evpn_private.h bgp_keepalives.h \
 	bgp_io.h bgp_flowspec.h bgp_flowspec_private.h bgp_flowspec_util.h \
-	bgp_labelpool.h
+	bgp_labelpool.h bgp_pbr.h
 
 bgpd_SOURCES = bgp_main.c
 bgpd_LDADD = libbgp.a  $(BGP_VNC_RFP_LIB) ../lib/libfrr.la @LIBCAP@ @LIBM@

bgpd/bgp_pbr.c

@@ -0,0 +1,44 @@
+/*
+ * BGP pbr
+ * Copyright (C) 6WIND
+ *
+ * FRR 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.
+ *
+ * FRR 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 "prefix.h"
+#include "zclient.h"
+
+#include "bgpd/bgp_pbr.h"
+
+
+struct bgp_pbr_action *bgp_pbr_action_rule_lookup(uint32_t unique)
+{
+	return NULL;
+}
+
+struct bgp_pbr_match *bgp_pbr_match_ipset_lookup(vrf_id_t vrf_id,
+						 uint32_t unique)
+{
+	return NULL;
+}
+
+struct bgp_pbr_match_entry *bgp_pbr_match_ipset_entry_lookup(vrf_id_t vrf_id,
+						       char *ipset_name,
+						       uint32_t unique)
+{
+	return NULL;
+}
+

bgpd/bgp_pbr.h

@@ -0,0 +1,81 @@
+/*
+ * BGP pbr
+ * Copyright (C) 6WIND
+ *
+ * FRR 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.
+ *
+ * FRR 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_PBR_H__
+#define __BGP_PBR_H__
+
+#include "nexthop.h"
+#include "zclient.h"
+
+struct bgp_pbr_match {
+	char ipset_name[ZEBRA_IPSET_NAME_SIZE];
+
+	/* mapped on enum ipset_type
+	 */
+	uint32_t type;
+
+	uint32_t unique;
+
+	bool installed;
+};
+
+struct bgp_pbr_match_entry {
+	struct bgp_pbr_match *backpointer;
+
+	uint32_t unique;
+
+	struct prefix src;
+	struct prefix dst;
+
+	bool installed;
+	bool install_in_progress;
+};
+
+struct bgp_pbr_action {
+
+	/*
+	 * The Unique identifier of this specific pbrms
+	 */
+	uint32_t unique;
+
+	uint32_t fwmark;
+
+	uint32_t table_id;
+
+	/*
+	 * nexthop information, or drop information
+	 * contains src vrf_id and nh contains dest vrf_id
+	 */
+	vrf_id_t vrf_id;
+	struct nexthop nh;
+
+	bool installed;
+	bool install_in_progress;
+
+	struct bgp_pbr_match *match;
+};
+
+extern struct bgp_pbr_action *bgp_pbr_action_rule_lookup(uint32_t unique);
+
+extern struct bgp_pbr_match *bgp_pbr_match_ipset_lookup(vrf_id_t vrf_id,
+							uint32_t unique);
+
+extern struct bgp_pbr_match_entry *bgp_pbr_match_ipset_entry_lookup(
+					    vrf_id_t vrf_id, char *name,
+					    uint32_t unique);
+#endif /* __BGP_PBR_H__ */