2 * IS-IS Rout(e)ing protocol - BFD support
3 * Copyright (C) 2018 Christian Franke
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)
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
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
24 #include "isisd/isis_bfd.h"
25 #include "isisd/isis_zebra.h"
26 #include "isisd/isis_common.h"
27 #include "isisd/isis_constants.h"
28 #include "isisd/isis_adjacency.h"
29 #include "isisd/isis_circuit.h"
30 #include "isisd/isisd.h"
31 #include "isisd/fabricd.h"
33 DEFINE_MTYPE_STATIC(ISISD
, BFD_SESSION
, "ISIS BFD Session")
36 struct in_addr dst_ip
;
37 struct in_addr src_ip
;
41 static struct bfd_session
*bfd_session_new(struct in_addr
*dst_ip
,
42 struct in_addr
*src_ip
)
44 struct bfd_session
*rv
;
46 rv
= XCALLOC(MTYPE_BFD_SESSION
, sizeof(*rv
));
52 static void bfd_session_free(struct bfd_session
**session
)
57 XFREE(MTYPE_BFD_SESSION
, *session
);
61 static void bfd_adj_event(struct isis_adjacency
*adj
, struct prefix
*dst
,
64 if (!adj
->bfd_session
)
67 if (adj
->bfd_session
->dst_ip
.s_addr
!= dst
->u
.prefix4
.s_addr
)
70 int old_status
= adj
->bfd_session
->status
;
72 adj
->bfd_session
->status
= new_status
;
73 if (old_status
== new_status
)
76 if (isis
->debugs
& DEBUG_BFD
) {
77 char dst_str
[INET6_ADDRSTRLEN
];
79 inet_ntop(AF_INET
, &adj
->bfd_session
->dst_ip
,
80 dst_str
, sizeof(dst_str
));
81 zlog_debug("ISIS-BFD: Peer %s on %s changed from %s to %s",
82 dst_str
, adj
->circuit
->interface
->name
,
83 bfd_get_status_str(old_status
),
84 bfd_get_status_str(new_status
));
87 if (old_status
!= BFD_STATUS_UP
88 || new_status
!= BFD_STATUS_DOWN
) {
92 isis_adj_state_change(adj
, ISIS_ADJ_DOWN
, "bfd session went down");
95 static int isis_bfd_interface_dest_update(ZAPI_CALLBACK_ARGS
)
97 struct interface
*ifp
;
101 ifp
= bfd_get_peer_info(zclient
->ibuf
, &dst_ip
, NULL
, &status
,
103 if (!ifp
|| dst_ip
.family
!= AF_INET
)
106 if (isis
->debugs
& DEBUG_BFD
) {
107 char dst_buf
[INET6_ADDRSTRLEN
];
109 inet_ntop(AF_INET
, &dst_ip
.u
.prefix4
,
110 dst_buf
, sizeof(dst_buf
));
112 zlog_debug("ISIS-BFD: Received update for %s on %s: Changed state to %s",
113 dst_buf
, ifp
->name
, bfd_get_status_str(status
));
116 struct isis_circuit
*circuit
= circuit_scan_by_ifp(ifp
);
121 if (circuit
->circ_type
== CIRCUIT_T_BROADCAST
) {
122 for (int level
= ISIS_LEVEL1
; level
<= ISIS_LEVEL2
; level
++) {
123 struct list
*adjdb
= circuit
->u
.bc
.adjdb
[level
- 1];
125 struct listnode
*node
, *nnode
;
126 struct isis_adjacency
*adj
;
128 for (ALL_LIST_ELEMENTS(adjdb
, node
, nnode
, adj
))
129 bfd_adj_event(adj
, &dst_ip
, status
);
131 } else if (circuit
->circ_type
== CIRCUIT_T_P2P
) {
132 if (circuit
->u
.p2p
.neighbor
) {
133 bfd_adj_event(circuit
->u
.p2p
.neighbor
,
141 static int isis_bfd_nbr_replay(ZAPI_CALLBACK_ARGS
)
143 bfd_client_sendmsg(zclient
, ZEBRA_BFD_CLIENT_REGISTER
, vrf_id
);
145 struct listnode
*anode
;
146 struct isis_area
*area
;
148 if (isis
->debugs
& DEBUG_BFD
)
149 zlog_debug("ISIS-BFD: Got neighbor replay request, resending neighbors.");
151 for (ALL_LIST_ELEMENTS_RO(isis
->area_list
, anode
, area
)) {
152 struct listnode
*cnode
;
153 struct isis_circuit
*circuit
;
155 for (ALL_LIST_ELEMENTS_RO(area
->circuit_list
, cnode
, circuit
))
156 isis_bfd_circuit_cmd(circuit
, ZEBRA_BFD_DEST_UPDATE
);
159 if (isis
->debugs
& DEBUG_BFD
)
160 zlog_debug("ISIS-BFD: Done with replay.");
165 static void (*orig_zebra_connected
)(struct zclient
*);
166 static void isis_bfd_zebra_connected(struct zclient
*zclient
)
168 if (orig_zebra_connected
)
169 orig_zebra_connected(zclient
);
171 bfd_client_sendmsg(zclient
, ZEBRA_BFD_CLIENT_REGISTER
, VRF_DEFAULT
);
174 static void bfd_debug(struct in_addr
*dst
, struct in_addr
*src
,
175 const char *interface
, int command
)
177 if (!(isis
->debugs
& DEBUG_BFD
))
180 char dst_str
[INET6_ADDRSTRLEN
];
181 char src_str
[INET6_ADDRSTRLEN
];
183 inet_ntop(AF_INET
, dst
, dst_str
, sizeof(dst_str
));
184 inet_ntop(AF_INET
, src
, src_str
, sizeof(src_str
));
186 const char *command_str
;
189 case ZEBRA_BFD_DEST_REGISTER
:
190 command_str
= "Register";
192 case ZEBRA_BFD_DEST_DEREGISTER
:
193 command_str
= "Deregister";
195 case ZEBRA_BFD_DEST_UPDATE
:
196 command_str
= "Update";
199 command_str
= "Unknown-Cmd";
203 zlog_debug("ISIS-BFD: %s peer %s on %s (src %s)",
204 command_str
, dst_str
, interface
, src_str
);
207 static void bfd_handle_adj_down(struct isis_adjacency
*adj
)
209 if (!adj
->bfd_session
)
212 bfd_debug(&adj
->bfd_session
->dst_ip
, &adj
->bfd_session
->src_ip
,
213 adj
->circuit
->interface
->name
, ZEBRA_BFD_DEST_DEREGISTER
);
215 bfd_peer_sendmsg(zclient
, NULL
, AF_INET
,
216 &adj
->bfd_session
->dst_ip
,
217 &adj
->bfd_session
->src_ip
,
218 adj
->circuit
->interface
->name
,
221 1, /* control plane independent bit is on */
222 ZEBRA_BFD_DEST_DEREGISTER
,
225 bfd_session_free(&adj
->bfd_session
);
228 static void bfd_handle_adj_up(struct isis_adjacency
*adj
, int command
)
230 struct isis_circuit
*circuit
= adj
->circuit
;
232 if (!circuit
->bfd_info
233 || !circuit
->ip_router
234 || !adj
->ipv4_address_count
)
237 struct list
*local_ips
= fabricd_ip_addrs(adj
->circuit
);
242 struct in_addr
*dst_ip
= &adj
->ipv4_addresses
[0];
243 struct prefix_ipv4
*local_ip
= listgetdata(listhead(local_ips
));
244 struct in_addr
*src_ip
= &local_ip
->prefix
;
246 if (adj
->bfd_session
) {
247 if (adj
->bfd_session
->dst_ip
.s_addr
!= dst_ip
->s_addr
248 || adj
->bfd_session
->src_ip
.s_addr
!= src_ip
->s_addr
)
249 bfd_handle_adj_down(adj
);
252 if (!adj
->bfd_session
)
253 adj
->bfd_session
= bfd_session_new(dst_ip
, src_ip
);
255 bfd_debug(&adj
->bfd_session
->dst_ip
, &adj
->bfd_session
->src_ip
,
256 circuit
->interface
->name
, command
);
257 bfd_peer_sendmsg(zclient
, circuit
->bfd_info
, AF_INET
,
258 &adj
->bfd_session
->dst_ip
,
259 &adj
->bfd_session
->src_ip
,
260 circuit
->interface
->name
,
263 1, /* control plane independent bit is on */
269 bfd_handle_adj_down(adj
);
272 static int bfd_handle_adj_state_change(struct isis_adjacency
*adj
)
274 if (adj
->adj_state
== ISIS_ADJ_UP
)
275 bfd_handle_adj_up(adj
, ZEBRA_BFD_DEST_REGISTER
);
277 bfd_handle_adj_down(adj
);
281 static void bfd_adj_cmd(struct isis_adjacency
*adj
, int command
)
283 if (adj
->adj_state
== ISIS_ADJ_UP
284 && command
!= ZEBRA_BFD_DEST_DEREGISTER
) {
285 bfd_handle_adj_up(adj
, command
);
287 bfd_handle_adj_down(adj
);
291 void isis_bfd_circuit_cmd(struct isis_circuit
*circuit
, int command
)
293 switch (circuit
->circ_type
) {
294 case CIRCUIT_T_BROADCAST
:
295 for (int level
= ISIS_LEVEL1
; level
<= ISIS_LEVEL2
; level
++) {
296 struct list
*adjdb
= circuit
->u
.bc
.adjdb
[level
- 1];
298 struct listnode
*node
;
299 struct isis_adjacency
*adj
;
301 for (ALL_LIST_ELEMENTS_RO(adjdb
, node
, adj
))
302 bfd_adj_cmd(adj
, command
);
306 if (circuit
->u
.p2p
.neighbor
)
307 bfd_adj_cmd(circuit
->u
.p2p
.neighbor
, command
);
314 void isis_bfd_circuit_param_set(struct isis_circuit
*circuit
,
315 uint32_t min_rx
, uint32_t min_tx
,
316 uint32_t detect_mult
, int defaults
)
320 bfd_set_param(&circuit
->bfd_info
, min_rx
,
321 min_tx
, detect_mult
, defaults
, &command
);
324 isis_bfd_circuit_cmd(circuit
, command
);
327 static int bfd_circuit_write_settings(struct isis_circuit
*circuit
,
330 struct bfd_info
*bfd_info
= circuit
->bfd_info
;
335 vty_out(vty
, " %s bfd\n", PROTO_NAME
);
339 void isis_bfd_init(void)
343 orig_zebra_connected
= zclient
->zebra_connected
;
344 zclient
->zebra_connected
= isis_bfd_zebra_connected
;
345 zclient
->interface_bfd_dest_update
= isis_bfd_interface_dest_update
;
346 zclient
->bfd_dest_replay
= isis_bfd_nbr_replay
;
347 hook_register(isis_adj_state_change_hook
,
348 bfd_handle_adj_state_change
);
349 hook_register(isis_circuit_config_write
,
350 bfd_circuit_write_settings
);