[mirror_frr.git] / isisd / isis_bfd.c

/*
 * IS-IS Rout(e)ing protocol - BFD support
 * Copyright (C) 2018 Christian Franke
 *
 * 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 "zclient.h"
#include "nexthop.h"
#include "bfd.h"
#include "lib_errors.h"

#include "isisd/isis_bfd.h"
#include "isisd/isis_zebra.h"
#include "isisd/isis_common.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_adjacency.h"
#include "isisd/isis_circuit.h"
#include "isisd/isisd.h"
#include "isisd/fabricd.h"

DEFINE_MTYPE_STATIC(ISISD, BFD_SESSION, "ISIS BFD Session");

static void adj_bfd_cb(struct bfd_session_params *bsp,
		       const struct bfd_session_status *bss, void *arg)
{
	struct isis_adjacency *adj = arg;

	if (IS_DEBUG_BFD)
		zlog_debug(
			"ISIS-BFD: BFD changed status for adjacency %s old %s new %s",
			isis_adj_name(adj),
			bfd_get_status_str(bss->previous_state),
			bfd_get_status_str(bss->state));

	if (bss->state == BFD_STATUS_DOWN
	    && bss->previous_state == BFD_STATUS_UP) {
		adj->circuit->area->bfd_signalled_down = true;
		isis_adj_state_change(&adj, ISIS_ADJ_DOWN,
				      "bfd session went down");
	}
}

static void bfd_handle_adj_down(struct isis_adjacency *adj)
{
	bfd_sess_free(&adj->bfd_session);
}

static void bfd_handle_adj_up(struct isis_adjacency *adj)
{
	struct isis_circuit *circuit = adj->circuit;
	int family;
	union g_addr dst_ip;
	union g_addr src_ip;
	struct list *local_ips;
	struct prefix *local_ip;

	if (!circuit->bfd_config.enabled) {
		if (IS_DEBUG_BFD)
			zlog_debug(
				"ISIS-BFD: skipping BFD initialization on adjacency with %s because BFD is not enabled for the circuit",
				isis_adj_name(adj));
		goto out;
	}

	/* If IS-IS IPv6 is configured wait for IPv6 address to be programmed
	 * before starting up BFD
	 */
	if (circuit->ipv6_router
	    && (listcount(circuit->ipv6_link) == 0
		|| adj->ipv6_address_count == 0)) {
		if (IS_DEBUG_BFD)
			zlog_debug(
				"ISIS-BFD: skipping BFD initialization on adjacency with %s because IPv6 is enabled but not ready",
				isis_adj_name(adj));
		return;
	}

	/*
	 * If IS-IS is enabled for both IPv4 and IPv6 on the circuit, prefer
	 * creating a BFD session over IPv6.
	 */
	if (circuit->ipv6_router && adj->ipv6_address_count) {
		family = AF_INET6;
		dst_ip.ipv6 = adj->ipv6_addresses[0];
		local_ips = circuit->ipv6_link;
		if (!local_ips || list_isempty(local_ips)) {
			if (IS_DEBUG_BFD)
				zlog_debug(
					"ISIS-BFD: skipping BFD initialization: IPv6 enabled and no local IPv6 addresses");
			goto out;
		}
		local_ip = listgetdata(listhead(local_ips));
		src_ip.ipv6 = local_ip->u.prefix6;
	} else if (circuit->ip_router && adj->ipv4_address_count) {
		family = AF_INET;
		dst_ip.ipv4 = adj->ipv4_addresses[0];
		local_ips = fabricd_ip_addrs(adj->circuit);
		if (!local_ips || list_isempty(local_ips)) {
			if (IS_DEBUG_BFD)
				zlog_debug(
					"ISIS-BFD: skipping BFD initialization: IPv4 enabled and no local IPv4 addresses");
			goto out;
		}
		local_ip = listgetdata(listhead(local_ips));
		src_ip.ipv4 = local_ip->u.prefix4;
	} else
		goto out;

	if (adj->bfd_session == NULL)
		adj->bfd_session = bfd_sess_new(adj_bfd_cb, adj);

	bfd_sess_set_timers(adj->bfd_session, BFD_DEF_DETECT_MULT,
			    BFD_DEF_MIN_RX, BFD_DEF_MIN_TX);
	if (family == AF_INET)
		bfd_sess_set_ipv4_addrs(adj->bfd_session, &src_ip.ipv4,
					&dst_ip.ipv4);
	else
		bfd_sess_set_ipv6_addrs(adj->bfd_session, &src_ip.ipv6,
					&dst_ip.ipv6);
	bfd_sess_set_interface(adj->bfd_session, adj->circuit->interface->name);
	bfd_sess_set_vrf(adj->bfd_session, adj->circuit->interface->vrf_id);
	bfd_sess_set_profile(adj->bfd_session, circuit->bfd_config.profile);
	bfd_sess_install(adj->bfd_session);
	return;
out:
	bfd_handle_adj_down(adj);
}

static int bfd_handle_adj_state_change(struct isis_adjacency *adj)
{
	if (adj->adj_state == ISIS_ADJ_UP)
		bfd_handle_adj_up(adj);
	else
		bfd_handle_adj_down(adj);
	return 0;
}

static void bfd_adj_cmd(struct isis_adjacency *adj)
{
	if (adj->adj_state == ISIS_ADJ_UP && adj->circuit->bfd_config.enabled)
		bfd_handle_adj_up(adj);
	else
		bfd_handle_adj_down(adj);
}

void isis_bfd_circuit_cmd(struct isis_circuit *circuit)
{
	switch (circuit->circ_type) {
	case CIRCUIT_T_BROADCAST:
		for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
			struct list *adjdb = circuit->u.bc.adjdb[level - 1];

			struct listnode *node;
			struct isis_adjacency *adj;

			for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj))
				bfd_adj_cmd(adj);
		}
		break;
	case CIRCUIT_T_P2P:
		if (circuit->u.p2p.neighbor)
			bfd_adj_cmd(circuit->u.p2p.neighbor);
		break;
	default:
		break;
	}
}

static int bfd_handle_adj_ip_enabled(struct isis_adjacency *adj, int family)
{

	if (family != AF_INET6)
		return 0;

	if (adj->bfd_session)
		return 0;

	if (adj->adj_state != ISIS_ADJ_UP)
		return 0;

	bfd_handle_adj_up(adj);

	return 0;
}

static int bfd_handle_circuit_add_addr(struct isis_circuit *circuit)
{
	struct isis_adjacency *adj;
	struct listnode *node;

	if (circuit->area == 0)
		return 0;

	for (ALL_LIST_ELEMENTS_RO(circuit->area->adjacency_list, node, adj)) {
		if (adj->bfd_session)
			continue;

		if (adj->adj_state != ISIS_ADJ_UP)
			continue;

		bfd_handle_adj_up(adj);
	}

	return 0;
}

void isis_bfd_init(struct thread_master *tm)
{
	bfd_protocol_integration_init(zclient, tm);

	hook_register(isis_adj_state_change_hook, bfd_handle_adj_state_change);
	hook_register(isis_adj_ip_enabled_hook, bfd_handle_adj_ip_enabled);
	hook_register(isis_circuit_add_addr_hook, bfd_handle_circuit_add_addr);
}
Commit	Line	Data
52df8228 CF	1	/*
52df8228 CF	2	* IS-IS Rout(e)ing protocol - BFD support
52df8228 CF	3	* Copyright (C) 2018 Christian Franke
52df8228 CF	4	*
d04f9fbf CF	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the Free
	7	* Software Foundation; either version 2 of the License, or (at your option)
	8	* any later version.
52df8228	9	*
d04f9fbf CF	10	* This program is distributed in the hope that it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
52df8228 CF	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; see the file COPYING; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
	19	#include <zebra.h>
	20
	21	#include "zclient.h"
e782cca7	22	#include "nexthop.h"
52df8228	23	#include "bfd.h"
e782cca7	24	#include "lib_errors.h"
52df8228 CF	25
	26	#include "isisd/isis_bfd.h"
	27	#include "isisd/isis_zebra.h"
215eccb0 CF	28	#include "isisd/isis_common.h"
	29	#include "isisd/isis_constants.h"
	30	#include "isisd/isis_adjacency.h"
	31	#include "isisd/isis_circuit.h"
3015e3d1	32	#include "isisd/isisd.h"
215eccb0	33	#include "isisd/fabricd.h"
52df8228	34
bf8d3d6a	35	DEFINE_MTYPE_STATIC(ISISD, BFD_SESSION, "ISIS BFD Session");
20a42f01	36
13bf3830 IR	37	static void adj_bfd_cb(struct bfd_session_params *bsp,
13bf3830 IR	38	const struct bfd_session_status bss, void arg)
52df8228	39	{
13bf3830	40	struct isis_adjacency *adj = arg;
ab880eaf	41
e740f9c1	42	if (IS_DEBUG_BFD)
13bf3830 IR	43	zlog_debug(
	44	"ISIS-BFD: BFD changed status for adjacency %s old %s new %s",
	45	isis_adj_name(adj),
	46	bfd_get_status_str(bss->previous_state),
	47	bfd_get_status_str(bss->state));
bb99eb5d	48
13bf3830 IR	49	if (bss->state == BFD_STATUS_DOWN
	50	&& bss->previous_state == BFD_STATUS_UP) {
	51	adj->circuit->area->bfd_signalled_down = true;
	52	isis_adj_state_change(&adj, ISIS_ADJ_DOWN,
	53	"bfd session went down");
bb99eb5d	54	}
bb99eb5d G	55	}
bb99eb5d G	56
20a42f01 CF	57	static void bfd_handle_adj_down(struct isis_adjacency *adj)
20a42f01 CF	58	{
13bf3830	59	bfd_sess_free(&adj->bfd_session);
20a42f01 CF	60	}
20a42f01 CF	61
13bf3830	62	static void bfd_handle_adj_up(struct isis_adjacency *adj)
215eccb0	63	{
20a42f01	64	struct isis_circuit *circuit = adj->circuit;
e782cca7 RW	65	int family;
	66	union g_addr dst_ip;
	67	union g_addr src_ip;
	68	struct list *local_ips;
	69	struct prefix *local_ip;
20a42f01	70
13bf3830	71	if (!circuit->bfd_config.enabled) {
980390ce EDP	72	if (IS_DEBUG_BFD)
980390ce EDP	73	zlog_debug(
13bf3830	74	"ISIS-BFD: skipping BFD initialization on adjacency with %s because BFD is not enabled for the circuit",
980390ce	75	isis_adj_name(adj));
20a42f01	76	goto out;
980390ce	77	}
20a42f01	78
2bec0447 KS	79	/* If IS-IS IPv6 is configured wait for IPv6 address to be programmed
	80	* before starting up BFD
	81	*/
0d5b1a3a EDP	82	if (circuit->ipv6_router
	83	&& (listcount(circuit->ipv6_link) == 0
	84	\|\| adj->ipv6_address_count == 0)) {
	85	if (IS_DEBUG_BFD)
	86	zlog_debug(
	87	"ISIS-BFD: skipping BFD initialization on adjacency with %s because IPv6 is enabled but not ready",
	88	isis_adj_name(adj));
2bec0447	89	return;
0d5b1a3a	90	}
2bec0447	91
e782cca7 RW	92	/*
	93	* If IS-IS is enabled for both IPv4 and IPv6 on the circuit, prefer
	94	* creating a BFD session over IPv6.
	95	*/
	96	if (circuit->ipv6_router && adj->ipv6_address_count) {
	97	family = AF_INET6;
	98	dst_ip.ipv6 = adj->ipv6_addresses[0];
	99	local_ips = circuit->ipv6_link;
980390ce EDP	100	if (!local_ips \|\| list_isempty(local_ips)) {
	101	if (IS_DEBUG_BFD)
	102	zlog_debug(
	103	"ISIS-BFD: skipping BFD initialization: IPv6 enabled and no local IPv6 addresses");
e782cca7	104	goto out;
980390ce	105	}
e782cca7 RW	106	local_ip = listgetdata(listhead(local_ips));
	107	src_ip.ipv6 = local_ip->u.prefix6;
	108	} else if (circuit->ip_router && adj->ipv4_address_count) {
	109	family = AF_INET;
	110	dst_ip.ipv4 = adj->ipv4_addresses[0];
	111	local_ips = fabricd_ip_addrs(adj->circuit);
980390ce EDP	112	if (!local_ips \|\| list_isempty(local_ips)) {
	113	if (IS_DEBUG_BFD)
	114	zlog_debug(
	115	"ISIS-BFD: skipping BFD initialization: IPv4 enabled and no local IPv4 addresses");
e782cca7	116	goto out;
980390ce	117	}
e782cca7 RW	118	local_ip = listgetdata(listhead(local_ips));
	119	src_ip.ipv4 = local_ip->u.prefix4;
	120	} else
20a42f01 CF	121	goto out;
20a42f01 CF	122
13bf3830 IR	123	if (adj->bfd_session == NULL)
13bf3830 IR	124	adj->bfd_session = bfd_sess_new(adj_bfd_cb, adj);
bb99eb5d	125
13bf3830 IR	126	bfd_sess_set_timers(adj->bfd_session, BFD_DEF_DETECT_MULT,
	127	BFD_DEF_MIN_RX, BFD_DEF_MIN_TX);
	128	if (family == AF_INET)
	129	bfd_sess_set_ipv4_addrs(adj->bfd_session, &src_ip.ipv4,
	130	&dst_ip.ipv4);
	131	else
	132	bfd_sess_set_ipv6_addrs(adj->bfd_session, &src_ip.ipv6,
	133	&dst_ip.ipv6);
	134	bfd_sess_set_interface(adj->bfd_session, adj->circuit->interface->name);
63262607	135	bfd_sess_set_vrf(adj->bfd_session, adj->circuit->interface->vrf_id);
13bf3830 IR	136	bfd_sess_set_profile(adj->bfd_session, circuit->bfd_config.profile);
13bf3830 IR	137	bfd_sess_install(adj->bfd_session);
215eccb0	138	return;
20a42f01 CF	139	out:
	140	bfd_handle_adj_down(adj);
	141	}
	142
	143	static int bfd_handle_adj_state_change(struct isis_adjacency *adj)
	144	{
	145	if (adj->adj_state == ISIS_ADJ_UP)
13bf3830	146	bfd_handle_adj_up(adj);
20a42f01 CF	147	else
	148	bfd_handle_adj_down(adj);
	149	return 0;
	150	}
	151
13bf3830	152	static void bfd_adj_cmd(struct isis_adjacency *adj)
20a42f01	153	{
13bf3830 IR	154	if (adj->adj_state == ISIS_ADJ_UP && adj->circuit->bfd_config.enabled)
	155	bfd_handle_adj_up(adj);
	156	else
20a42f01	157	bfd_handle_adj_down(adj);
20a42f01 CF	158	}
20a42f01 CF	159
13bf3830	160	void isis_bfd_circuit_cmd(struct isis_circuit *circuit)
20a42f01 CF	161	{
	162	switch (circuit->circ_type) {
	163	case CIRCUIT_T_BROADCAST:
	164	for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
	165	struct list *adjdb = circuit->u.bc.adjdb[level - 1];
	166
	167	struct listnode *node;
	168	struct isis_adjacency *adj;
5489eb45	169
20a42f01	170	for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj))
13bf3830	171	bfd_adj_cmd(adj);
20a42f01 CF	172	}
	173	break;
	174	case CIRCUIT_T_P2P:
	175	if (circuit->u.p2p.neighbor)
13bf3830	176	bfd_adj_cmd(circuit->u.p2p.neighbor);
20a42f01 CF	177	break;
	178	default:
	179	break;
	180	}
215eccb0 CF	181	}
215eccb0 CF	182
2bec0447 KS	183	static int bfd_handle_adj_ip_enabled(struct isis_adjacency *adj, int family)
	184	{
	185
	186	if (family != AF_INET6)
	187	return 0;
	188
	189	if (adj->bfd_session)
	190	return 0;
	191
	192	if (adj->adj_state != ISIS_ADJ_UP)
	193	return 0;
	194
13bf3830	195	bfd_handle_adj_up(adj);
2bec0447 KS	196
	197	return 0;
	198	}
	199
	200	static int bfd_handle_circuit_add_addr(struct isis_circuit *circuit)
	201	{
	202	struct isis_adjacency *adj;
	203	struct listnode *node;
	204
	205	if (circuit->area == 0)
	206	return 0;
	207
	208	for (ALL_LIST_ELEMENTS_RO(circuit->area->adjacency_list, node, adj)) {
	209	if (adj->bfd_session)
	210	continue;
	211
	212	if (adj->adj_state != ISIS_ADJ_UP)
	213	continue;
	214
13bf3830	215	bfd_handle_adj_up(adj);
2bec0447 KS	216	}
	217
	218	return 0;
	219	}
	220
13bf3830	221	void isis_bfd_init(struct thread_master *tm)
52df8228	222	{
13bf3830 IR	223	bfd_protocol_integration_init(zclient, tm);
	224
	225	hook_register(isis_adj_state_change_hook, bfd_handle_adj_state_change);
2bec0447 KS	226	hook_register(isis_adj_ip_enabled_hook, bfd_handle_adj_ip_enabled);
2bec0447 KS	227	hook_register(isis_circuit_add_addr_hook, bfd_handle_circuit_add_addr);
52df8228	228	}