pbrd: Add `set vrf NAME` and `set vrf unchanged`

`set vrf NAME` allows the pbr map to point to an arbitrary vrf table.

`set vrf unchanged` will use the interface's vrf for table lookup.

Further, add functionality for pbr to respond to interface events
such as interface vrf changes & interface creation/deletion.

Ex)
ubuntu_nh# show pbr map
  pbr-map TEST valid: 1
    Seq: 1 rule: 300 Installed: 3(1) Reason: Valid
        SRC Match: 3.3.3.3/32
        VRF Unchanged (use interface vrf)
  pbr-map TEST2 valid: 1
    Seq: 2 rule: 301 Installed: 3(2) Reason: Valid
        SRC Match: 4.4.4.4/32
        VRF Lookup: vrf-red

root@ubuntu_nh:/home# ip rule show
0:      from all lookup local
300:    from 3.3.3.3 iif dummy2 lookup main
300:    from 3.3.3.3 iif dummyVRF lookup 1111
301:    from 4.4.4.4 iif dummy1 lookup 1111
301:    from 4.4.4.4 iif dummy3 lookup 1111

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com-

1 files changed, 137 insertions, 0 deletions

diff --git a/pbrd/pbr_vrf.c b/pbrd/pbr_vrf.c
new file mode 100644
index 0000000000..d5a2bd0fef
--- /dev/null
+++ b/pbrd/pbr_vrf.c
@@ -0,0 +1,137 @@
+/*
+ * PBR - vrf code
+ * Copyright (C) 2019 Cumulus Networks, Inc.
+ *               Stephen Worley
+ *
+ * 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 "vrf.h"
+
+#include "pbr_vrf.h"
+#include "pbr_memory.h"
+#include "pbr_map.h"
+#include "pbr_debug.h"
+
+DEFINE_MTYPE_STATIC(PBRD, PBR_MAP_VRF, "PBR Map VRF")
+
+static struct pbr_vrf *pbr_vrf_alloc(void)
+{
+	struct pbr_vrf *pbr_vrf;
+
+	pbr_vrf = XCALLOC(MTYPE_PBR_MAP_VRF, sizeof(struct pbr_vrf));
+
+	return pbr_vrf;
+}
+
+static void pbr_vrf_free(struct pbr_vrf *pbr_vrf)
+{
+	XFREE(MTYPE_PBR_MAP_VRF, pbr_vrf);
+}
+
+static int pbr_vrf_new(struct vrf *vrf)
+{
+	struct pbr_vrf *pbr_vrf;
+
+	DEBUGD(&pbr_dbg_event, "%s: %u (%s)", __func__, vrf->vrf_id, vrf->name);
+
+	pbr_vrf = pbr_vrf_alloc();
+	vrf->info = pbr_vrf;
+	pbr_vrf->vrf = vrf;
+
+	return 0;
+}
+
+static int pbr_vrf_enable(struct vrf *vrf)
+{
+	DEBUGD(&pbr_dbg_event, "%s: %u (%s)", __func__, vrf->vrf_id, vrf->name);
+
+	pbr_map_vrf_update(vrf->info);
+
+	return 0;
+}
+
+static int pbr_vrf_disable(struct vrf *vrf)
+{
+	DEBUGD(&pbr_dbg_event, "%s: %u (%s)", __func__, vrf->vrf_id, vrf->name);
+
+	pbr_map_vrf_update(vrf->info);
+
+	return 0;
+}
+
+static int pbr_vrf_delete(struct vrf *vrf)
+{
+	DEBUGD(&pbr_dbg_event, "%s: %u (%s)", __func__, vrf->vrf_id, vrf->name);
+
+	/*
+	 * Make sure vrf is always marked disabled first so we handle
+	 * pbr rules using it.
+	 */
+	assert(!vrf_is_enabled(vrf));
+
+	pbr_vrf_free(vrf->info);
+	vrf->info = NULL;
+
+	return 0;
+}
+
+struct pbr_vrf *pbr_vrf_lookup_by_id(vrf_id_t vrf_id)
+{
+	struct vrf *vrf;
+
+	vrf = vrf_lookup_by_id(vrf_id);
+	if (vrf)
+		return ((struct pbr_vrf *)vrf->info);
+
+	return NULL;
+}
+
+struct pbr_vrf *pbr_vrf_lookup_by_name(const char *name)
+{
+	struct vrf *vrf;
+
+	if (!name)
+		name = VRF_DEFAULT_NAME;
+
+	vrf = vrf_lookup_by_name(name);
+	if (vrf)
+		return ((struct pbr_vrf *)vrf->info);
+
+	return NULL;
+}
+
+bool pbr_vrf_is_enabled(const struct pbr_vrf *pbr_vrf)
+{
+	return vrf_is_enabled(pbr_vrf->vrf) ? true : false;
+}
+
+bool pbr_vrf_is_valid(const struct pbr_vrf *pbr_vrf)
+{
+	if (vrf_is_backend_netns())
+		return false;
+
+	if (!pbr_vrf->vrf)
+		return false;
+
+	return pbr_vrf_is_enabled(pbr_vrf);
+}
+
+void pbr_vrf_init(void)
+{
+	vrf_init(pbr_vrf_new, pbr_vrf_enable, pbr_vrf_disable, pbr_vrf_delete,
+		 NULL);
+}