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git.proxmox.com Git - mirror_frr.git/blob - ldpd/notification.c
4 * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
25 #include "ldp_debug.h"
27 static int gen_returned_tlvs(struct ibuf
*, uint16_t, uint16_t, char *);
28 static void log_msg_notification(int, struct nbr
*, struct notify_msg
*);
31 send_notification_full(struct tcp_conn
*tcp
, struct notify_msg
*nm
)
38 size
= LDP_HDR_SIZE
+ LDP_MSG_SIZE
+ STATUS_SIZE
;
39 if (nm
->flags
& F_NOTIF_PW_STATUS
)
40 size
+= PW_STATUS_TLV_SIZE
;
41 if (nm
->flags
& F_NOTIF_FEC
)
42 size
+= len_fec_tlv(&nm
->fec
);
43 if (nm
->flags
& F_NOTIF_RETURNED_TLVS
)
44 size
+= TLV_HDR_SIZE
* 2 + nm
->rtlvs
.length
;
46 if ((buf
= ibuf_open(size
)) == NULL
)
49 err
|= gen_ldp_hdr(buf
, size
);
51 err
|= gen_msg_hdr(buf
, MSG_TYPE_NOTIFICATION
, size
);
52 err
|= gen_status_tlv(buf
, nm
->status_code
, nm
->msg_id
, nm
->msg_type
);
54 if (nm
->flags
& F_NOTIF_PW_STATUS
)
55 err
|= gen_pw_status_tlv(buf
, nm
->pw_status
);
56 if (nm
->flags
& F_NOTIF_FEC
)
57 err
|= gen_fec_tlv(buf
, &nm
->fec
);
58 if (nm
->flags
& F_NOTIF_RETURNED_TLVS
)
59 err
|= gen_returned_tlvs(buf
, nm
->rtlvs
.type
, nm
->rtlvs
.length
,
67 log_msg_notification(1, tcp
->nbr
, nm
);
68 nbr_fsm(tcp
->nbr
, NBR_EVT_PDU_SENT
);
69 tcp
->nbr
->stats
.notif_sent
++;
72 /* update SNMP session counters */
73 switch (nm
->status_code
) {
75 leconf
->stats
.session_rejects_hello
++;
78 leconf
->stats
.bad_ldp_id
++;
81 leconf
->stats
.bad_pdu_len
++;
84 leconf
->stats
.bad_msg_len
++;
87 leconf
->stats
.bad_tlv_len
++;
90 leconf
->stats
.malformed_tlv
++;
93 leconf
->stats
.keepalive_timer_exp
++;
96 leconf
->stats
.shutdown_send_notify
++;
102 evbuf_enqueue(&tcp
->wbuf
, buf
);
105 /* send a notification without optional tlvs */
107 send_notification(struct tcp_conn
*tcp
, uint32_t status_code
, uint32_t msg_id
,
110 struct notify_msg nm
;
112 memset(&nm
, 0, sizeof(nm
));
113 nm
.status_code
= status_code
;
115 nm
.msg_type
= msg_type
;
117 send_notification_full(tcp
, &nm
);
121 send_notification_rtlvs(struct nbr
*nbr
, uint32_t status_code
, uint32_t msg_id
,
122 uint16_t msg_type
, uint16_t tlv_type
, uint16_t tlv_len
, char *tlv_data
)
124 struct notify_msg nm
;
126 memset(&nm
, 0, sizeof(nm
));
127 nm
.status_code
= status_code
;
129 nm
.msg_type
= msg_type
;
130 /* do not append the given TLV if it's too big (shouldn't happen) */
131 if (tlv_len
< 1024) {
132 nm
.rtlvs
.type
= tlv_type
;
133 nm
.rtlvs
.length
= tlv_len
;
134 nm
.rtlvs
.data
= tlv_data
;
135 nm
.flags
|= F_NOTIF_RETURNED_TLVS
;
138 send_notification_full(nbr
->tcp
, &nm
);
142 recv_notification(struct nbr
*nbr
, char *buf
, uint16_t len
)
145 struct status_tlv st
;
146 struct notify_msg nm
;
149 memcpy(&msg
, buf
, sizeof(msg
));
153 if (len
< STATUS_SIZE
) {
154 session_shutdown(nbr
, S_BAD_MSG_LEN
, msg
.id
, msg
.type
);
155 leconf
->stats
.bad_msg_len
++;
158 memcpy(&st
, buf
, sizeof(st
));
160 if (ntohs(st
.length
) > STATUS_SIZE
- TLV_HDR_SIZE
||
161 ntohs(st
.length
) > len
- TLV_HDR_SIZE
) {
162 session_shutdown(nbr
, S_BAD_TLV_LEN
, msg
.id
, msg
.type
);
163 leconf
->stats
.bad_tlv_len
++;
169 memset(&nm
, 0, sizeof(nm
));
170 nm
.status_code
= ntohl(st
.status_code
);
172 /* Optional Parameters */
178 if (len
< sizeof(tlv
)) {
179 session_shutdown(nbr
, S_BAD_TLV_LEN
, msg
.id
, msg
.type
);
180 leconf
->stats
.bad_tlv_len
++;
184 memcpy(&tlv
, buf
, TLV_HDR_SIZE
);
185 tlv_type
= ntohs(tlv
.type
);
186 tlv_len
= ntohs(tlv
.length
);
187 if (tlv_len
+ TLV_HDR_SIZE
> len
) {
188 session_shutdown(nbr
, S_BAD_TLV_LEN
, msg
.id
, msg
.type
);
189 leconf
->stats
.bad_tlv_len
++;
196 case TLV_TYPE_EXTSTATUS
:
197 case TLV_TYPE_RETURNEDPDU
:
198 case TLV_TYPE_RETURNEDMSG
:
199 /* TODO is there any use for this? */
201 case TLV_TYPE_PW_STATUS
:
203 session_shutdown(nbr
, S_BAD_TLV_LEN
,
208 nm
.pw_status
= ntohl(*(uint32_t *)buf
);
209 nm
.flags
|= F_NOTIF_PW_STATUS
;
212 if ((tlen
= tlv_decode_fec_elm(nbr
, &msg
, buf
,
213 tlv_len
, &nm
.fec
)) == -1)
215 /* allow only one fec element */
216 if (tlen
!= tlv_len
) {
217 session_shutdown(nbr
, S_BAD_TLV_VAL
,
219 leconf
->stats
.bad_tlv_len
++;
222 nm
.flags
|= F_NOTIF_FEC
;
225 if (!(ntohs(tlv
.type
) & UNKNOWN_FLAG
)) {
226 nbr
->stats
.unknown_tlv
++;
227 send_notification_rtlvs(nbr
, S_UNKNOWN_TLV
,
228 msg
.id
, msg
.type
, tlv_type
, tlv_len
, buf
);
230 /* ignore unknown tlv */
238 switch (nm
.status_code
) {
240 if (!(nm
.flags
& (F_NOTIF_PW_STATUS
|F_NOTIF_FEC
))) {
241 send_notification(nbr
->tcp
, S_MISS_MSG
,
246 switch (nm
.fec
.type
) {
250 send_notification(nbr
->tcp
, S_BAD_TLV_VAL
,
256 if (!(nm
.flags
& F_NOTIF_FEC
)) {
257 send_notification(nbr
->tcp
, S_MISS_MSG
,
261 if (nm
.fec
.type
!= MAP_TYPE_TYPED_WCARD
) {
262 send_notification(nbr
->tcp
, S_BAD_TLV_VAL
,
271 log_msg_notification(0, nbr
, &nm
);
273 if (st
.status_code
& htonl(STATUS_FATAL
)) {
274 if (nbr
->state
== NBR_STA_OPENSENT
)
275 nbr_start_idtimer(nbr
);
278 * RFC 5036 - Section 3.5.1.1:
279 * "When an LSR receives a Shutdown message during session
280 * initialization, it SHOULD transmit a Shutdown message and
281 * then close the transport connection".
283 if (nbr
->state
!= NBR_STA_OPER
&&
284 nm
.status_code
== S_SHUTDOWN
) {
285 leconf
->stats
.session_attempts
++;
286 send_notification(nbr
->tcp
, S_SHUTDOWN
,
290 leconf
->stats
.shutdown_rcv_notify
++;
291 nbr_fsm(nbr
, NBR_EVT_CLOSE_SESSION
);
295 /* lde needs to know about a few notification messages
296 * and update SNMP session counters
298 switch (nm
.status_code
) {
301 ldpe_imsg_compose_lde(IMSG_NOTIFICATION
, nbr
->peerid
, 0,
305 leconf
->stats
.session_rejects_hello
++;
307 case S_PARM_ADV_MODE
:
308 leconf
->stats
.session_rejects_ad
++;
311 leconf
->stats
.session_rejects_max_pdu
++;
314 leconf
->stats
.session_rejects_lr
++;
317 leconf
->stats
.bad_ldp_id
++;
320 leconf
->stats
.bad_pdu_len
++;
323 leconf
->stats
.bad_msg_len
++;
326 leconf
->stats
.bad_tlv_len
++;
329 leconf
->stats
.malformed_tlv
++;
332 leconf
->stats
.shutdown_rcv_notify
++;
342 gen_status_tlv(struct ibuf
*buf
, uint32_t status_code
, uint32_t msg_id
,
345 struct status_tlv st
;
347 memset(&st
, 0, sizeof(st
));
348 st
.type
= htons(TLV_TYPE_STATUS
);
349 st
.length
= htons(STATUS_TLV_LEN
);
350 st
.status_code
= htonl(status_code
);
352 * For convenience, msg_id and msg_type are already in network
356 st
.msg_type
= msg_type
;
358 return (ibuf_add(buf
, &st
, STATUS_SIZE
));
362 gen_returned_tlvs(struct ibuf
*buf
, uint16_t type
, uint16_t length
,
369 rtlvs
.type
= htons(TLV_TYPE_RETURNED_TLVS
);
370 rtlvs
.length
= htons(length
+ TLV_HDR_SIZE
);
371 tlv
.type
= htons(type
);
372 tlv
.length
= htons(length
);
374 err
= ibuf_add(buf
, &rtlvs
, sizeof(rtlvs
));
375 err
|= ibuf_add(buf
, &tlv
, sizeof(tlv
));
376 err
|= ibuf_add(buf
, tlv_data
, length
);
382 log_msg_notification(int out
, struct nbr
*nbr
, struct notify_msg
*nm
)
384 if (nm
->status_code
& STATUS_FATAL
) {
385 debug_msg(out
, "notification: lsr-id %pI4, status %s (fatal error)", &nbr
->id
,
386 status_code_name(nm
->status_code
));
390 debug_msg(out
, "notification: lsr-id %pI4, status %s",
391 &nbr
->id
, status_code_name(nm
->status_code
));
392 if (nm
->flags
& F_NOTIF_FEC
)
393 debug_msg(out
, "notification: fec %s", log_map(&nm
->fec
));
394 if (nm
->flags
& F_NOTIF_PW_STATUS
)
395 debug_msg(out
, "notification: pw-status %s",
396 (nm
->pw_status
== PW_FORWARDING
) ? "forwarding" : "not forwarding");