Adding upstream version 9.1.upstream/9.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 290 insertions, 0 deletions

diff --git a/ospf6d/ospf6_bfd.c b/ospf6d/ospf6_bfd.c
new file mode 100644
index 0000000..6379f9d
--- /dev/null
+++ b/ospf6d/ospf6_bfd.c
@@ -0,0 +1,290 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * ospf6_bfd.c: IPv6 OSPF BFD handling routines
+ *
+ * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
+ */
+
+#include <zebra.h>
+
+#include "command.h"
+#include "linklist.h"
+#include "memory.h"
+#include "prefix.h"
+#include "frrevent.h"
+#include "buffer.h"
+#include "stream.h"
+#include "zclient.h"
+#include "vty.h"
+#include "table.h"
+#include "bfd.h"
+#include "if.h"
+#include "ospf6d.h"
+#include "ospf6_message.h"
+#include "ospf6_neighbor.h"
+#include "ospf6_interface.h"
+#include "ospf6_route.h"
+#include "ospf6_zebra.h"
+#include "ospf6_bfd.h"
+
+extern struct zclient *zclient;
+
+/*
+ * ospf6_bfd_trigger_event - Neighbor is registered/deregistered with BFD when
+ *                           neighbor state is changed to/from 2way.
+ */
+void ospf6_bfd_trigger_event(struct ospf6_neighbor *on, int old_state,
+			     int state)
+{
+	int family;
+	struct in6_addr src, dst;
+
+	/* Skip sessions without BFD. */
+	if (on->bfd_session == NULL)
+		return;
+
+	if (old_state < OSPF6_NEIGHBOR_TWOWAY
+	    && state >= OSPF6_NEIGHBOR_TWOWAY) {
+		/*
+		 * Check if neighbor address changed.
+		 *
+		 * When the neighbor is configured BFD before having an existing
+		 * connection, then the destination address will be set to `::`
+		 * which will cause session installation failure. This piece of
+		 * code updates the address in that case.
+		 */
+		bfd_sess_addresses(on->bfd_session, &family, &src, &dst);
+		if (memcmp(&on->linklocal_addr, &dst, sizeof(dst))) {
+			bfd_sess_set_ipv6_addrs(on->bfd_session, &src,
+						&on->linklocal_addr);
+		}
+
+		bfd_sess_install(on->bfd_session);
+	} else if (old_state >= OSPF6_NEIGHBOR_TWOWAY
+		   && state < OSPF6_NEIGHBOR_TWOWAY)
+		bfd_sess_uninstall(on->bfd_session);
+}
+
+/*
+ * ospf6_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated
+ *                               with a interface with BFD through
+ *                               zebra for starting/stopping the monitoring of
+ *                               the neighbor rechahability.
+ */
+static void ospf6_bfd_reg_dereg_all_nbr(struct ospf6_interface *oi,
+					bool install)
+{
+	struct ospf6_neighbor *on;
+	struct listnode *node;
+
+	for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
+		/* Remove all sessions. */
+		if (!install) {
+			bfd_sess_free(&on->bfd_session);
+			continue;
+		}
+
+		/* Always allocate session data even if not enabled. */
+		ospf6_bfd_info_nbr_create(oi, on);
+
+		/*
+		 * If not connected yet, don't create any session but defer it
+		 * for later. See function `ospf6_bfd_trigger_event`.
+		 */
+		if (on->state < OSPF6_NEIGHBOR_TWOWAY)
+			continue;
+
+		bfd_sess_install(on->bfd_session);
+	}
+}
+
+static void ospf6_bfd_callback(struct bfd_session_params *bsp,
+			       const struct bfd_session_status *bss, void *arg)
+{
+	struct ospf6_neighbor *on = arg;
+
+	if (bss->state == BFD_STATUS_DOWN
+	    && bss->previous_state == BFD_STATUS_UP) {
+		EVENT_OFF(on->inactivity_timer);
+		event_add_event(master, inactivity_timer, on, 0, NULL);
+	}
+}
+
+/*
+ * ospf6_bfd_info_nbr_create - Create/update BFD information for a neighbor.
+ */
+void ospf6_bfd_info_nbr_create(struct ospf6_interface *oi,
+			       struct ospf6_neighbor *on)
+{
+	if (!oi->bfd_config.enabled)
+		return;
+
+	if (on->bfd_session == NULL)
+		on->bfd_session = bfd_sess_new(ospf6_bfd_callback, on);
+
+	bfd_sess_set_timers(on->bfd_session,
+			    oi->bfd_config.detection_multiplier,
+			    oi->bfd_config.min_rx, oi->bfd_config.min_tx);
+	bfd_sess_set_ipv6_addrs(on->bfd_session, on->ospf6_if->linklocal_addr,
+				&on->linklocal_addr);
+	bfd_sess_set_interface(on->bfd_session, oi->interface->name);
+	bfd_sess_set_vrf(on->bfd_session, oi->interface->vrf->vrf_id);
+	bfd_sess_set_profile(on->bfd_session, oi->bfd_config.profile);
+}
+
+/*
+ * ospf6_bfd_write_config - Write the interface BFD configuration.
+ */
+void ospf6_bfd_write_config(struct vty *vty, struct ospf6_interface *oi)
+{
+	if (!oi->bfd_config.enabled)
+		return;
+
+#if HAVE_BFDD == 0
+	if (oi->bfd_config.detection_multiplier != BFD_DEF_DETECT_MULT
+	    || oi->bfd_config.min_rx != BFD_DEF_MIN_RX
+	    || oi->bfd_config.min_tx != BFD_DEF_MIN_TX)
+		vty_out(vty, " ipv6 ospf6 bfd %d %d %d\n",
+			oi->bfd_config.detection_multiplier,
+			oi->bfd_config.min_rx, oi->bfd_config.min_tx);
+	else
+#endif /* ! HAVE_BFDD */
+		vty_out(vty, " ipv6 ospf6 bfd\n");
+
+	if (oi->bfd_config.profile)
+		vty_out(vty, " ipv6 ospf6 bfd profile %s\n",
+			oi->bfd_config.profile);
+}
+
+DEFUN(ipv6_ospf6_bfd, ipv6_ospf6_bfd_cmd,
+      "ipv6 ospf6 bfd [profile BFDPROF]",
+      IP6_STR OSPF6_STR
+      "Enables BFD support\n"
+      "BFD Profile selection\n"
+      "BFD Profile name\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	int prof_idx = 4;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->bfd_config.detection_multiplier = BFD_DEF_DETECT_MULT;
+	oi->bfd_config.min_rx = BFD_DEF_MIN_RX;
+	oi->bfd_config.min_tx = BFD_DEF_MIN_TX;
+	oi->bfd_config.enabled = true;
+	if (argc > prof_idx) {
+		XFREE(MTYPE_TMP, oi->bfd_config.profile);
+		oi->bfd_config.profile =
+			XSTRDUP(MTYPE_TMP, argv[prof_idx]->arg);
+	}
+
+	ospf6_bfd_reg_dereg_all_nbr(oi, true);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_ipv6_ospf6_bfd_profile, no_ipv6_ospf6_bfd_profile_cmd,
+      "no ipv6 ospf6 bfd profile [BFDPROF]",
+      NO_STR IP6_STR OSPF6_STR
+      "BFD support\n"
+      "BFD Profile selection\n"
+      "BFD Profile name\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	/* BFD not enabled, nothing to do. */
+	if (!oi->bfd_config.enabled)
+		return CMD_SUCCESS;
+
+	/* Remove profile and apply new configuration. */
+	XFREE(MTYPE_TMP, oi->bfd_config.profile);
+	ospf6_bfd_reg_dereg_all_nbr(oi, true);
+
+	return CMD_SUCCESS;
+}
+
+#if HAVE_BFDD > 0
+DEFUN_HIDDEN(
+#else
+DEFUN(
+#endif /* HAVE_BFDD */
+       ipv6_ospf6_bfd_param,
+       ipv6_ospf6_bfd_param_cmd,
+       "ipv6 ospf6 bfd (2-255) (50-60000) (50-60000)",
+       IP6_STR
+       OSPF6_STR
+       "Enables BFD support\n"
+       "Detect Multiplier\n"
+       "Required min receive interval\n"
+       "Desired min transmit interval\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	int idx_number_2 = 4;
+	int idx_number_3 = 5;
+	struct ospf6_interface *oi;
+
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->bfd_config.detection_multiplier =
+		strtoul(argv[idx_number]->arg, NULL, 10);
+	oi->bfd_config.min_rx = strtoul(argv[idx_number_2]->arg, NULL, 10);
+	oi->bfd_config.min_tx = strtoul(argv[idx_number_3]->arg, NULL, 10);
+	oi->bfd_config.enabled = true;
+
+	ospf6_bfd_reg_dereg_all_nbr(oi, true);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_ospf6_bfd,
+       no_ipv6_ospf6_bfd_cmd,
+       "no ipv6 ospf6 bfd",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Disables BFD support\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->bfd_config.enabled = false;
+	ospf6_bfd_reg_dereg_all_nbr(oi, false);
+
+	return CMD_SUCCESS;
+}
+
+void ospf6_bfd_init(void)
+{
+	bfd_protocol_integration_init(zclient, master);
+
+	/* Install BFD command */
+	install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_param_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_bfd_profile_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_bfd_cmd);
+}