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8429abe0 RW |
1 | /* $OpenBSD$ */ |
2 | ||
3 | /* | |
4 | * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org> | |
5 | * | |
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. | |
9 | * | |
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. | |
17 | */ | |
18 | ||
eac6e3f0 | 19 | #include <zebra.h> |
8429abe0 RW |
20 | |
21 | #include "ldpd.h" | |
22 | #include "ldpe.h" | |
23 | #include "log.h" | |
eac6e3f0 | 24 | #include "ldp_debug.h" |
8429abe0 RW |
25 | |
26 | static int gen_init_prms_tlv(struct ibuf *, struct nbr *); | |
8819fc38 | 27 | static int gen_cap_dynamic_tlv(struct ibuf *); |
d4afb819 | 28 | static int gen_cap_twcard_tlv(struct ibuf *, int); |
257799cd | 29 | static int gen_cap_unotif_tlv(struct ibuf *, int); |
8429abe0 RW |
30 | |
31 | void | |
32 | send_init(struct nbr *nbr) | |
33 | { | |
34 | struct ibuf *buf; | |
35 | uint16_t size; | |
36 | int err = 0; | |
37 | ||
eac6e3f0 | 38 | debug_msg_send("initialization: lsr-id %s", inet_ntoa(nbr->id)); |
8429abe0 | 39 | |
8819fc38 | 40 | size = LDP_HDR_SIZE + LDP_MSG_SIZE + SESS_PRMS_SIZE + |
257799cd | 41 | CAP_TLV_DYNAMIC_SIZE + CAP_TLV_TWCARD_SIZE + CAP_TLV_UNOTIF_SIZE; |
8429abe0 RW |
42 | if ((buf = ibuf_open(size)) == NULL) |
43 | fatal(__func__); | |
44 | ||
45 | err |= gen_ldp_hdr(buf, size); | |
46 | size -= LDP_HDR_SIZE; | |
47 | err |= gen_msg_hdr(buf, MSG_TYPE_INIT, size); | |
8429abe0 | 48 | err |= gen_init_prms_tlv(buf, nbr); |
8819fc38 | 49 | err |= gen_cap_dynamic_tlv(buf); |
d4afb819 | 50 | err |= gen_cap_twcard_tlv(buf, 1); |
257799cd | 51 | err |= gen_cap_unotif_tlv(buf, 1); |
8429abe0 RW |
52 | if (err) { |
53 | ibuf_free(buf); | |
54 | return; | |
55 | } | |
56 | ||
57 | evbuf_enqueue(&nbr->tcp->wbuf, buf); | |
58 | } | |
59 | ||
60 | int | |
61 | recv_init(struct nbr *nbr, char *buf, uint16_t len) | |
62 | { | |
63 | struct ldp_msg msg; | |
64 | struct sess_prms_tlv sess; | |
65 | uint16_t max_pdu_len; | |
8819fc38 | 66 | int caps_rcvd = 0; |
8429abe0 | 67 | |
eac6e3f0 | 68 | debug_msg_recv("initialization: lsr-id %s", inet_ntoa(nbr->id)); |
8429abe0 RW |
69 | |
70 | memcpy(&msg, buf, sizeof(msg)); | |
71 | buf += LDP_MSG_SIZE; | |
72 | len -= LDP_MSG_SIZE; | |
73 | ||
74 | if (len < SESS_PRMS_SIZE) { | |
75 | session_shutdown(nbr, S_BAD_MSG_LEN, msg.id, msg.type); | |
76 | return (-1); | |
77 | } | |
78 | memcpy(&sess, buf, sizeof(sess)); | |
79 | if (ntohs(sess.length) != SESS_PRMS_LEN) { | |
80 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type); | |
81 | return (-1); | |
82 | } | |
83 | if (ntohs(sess.proto_version) != LDP_VERSION) { | |
84 | session_shutdown(nbr, S_BAD_PROTO_VER, msg.id, msg.type); | |
85 | return (-1); | |
86 | } | |
87 | if (ntohs(sess.keepalive_time) < MIN_KEEPALIVE) { | |
88 | session_shutdown(nbr, S_KEEPALIVE_BAD, msg.id, msg.type); | |
89 | return (-1); | |
90 | } | |
eac6e3f0 | 91 | if (sess.lsr_id != ldp_rtr_id_get(leconf) || |
8429abe0 RW |
92 | ntohs(sess.lspace_id) != 0) { |
93 | session_shutdown(nbr, S_NO_HELLO, msg.id, msg.type); | |
94 | return (-1); | |
95 | } | |
96 | ||
97 | buf += SESS_PRMS_SIZE; | |
98 | len -= SESS_PRMS_SIZE; | |
99 | ||
100 | /* Optional Parameters */ | |
101 | while (len > 0) { | |
102 | struct tlv tlv; | |
8819fc38 | 103 | uint16_t tlv_type; |
8429abe0 RW |
104 | uint16_t tlv_len; |
105 | ||
106 | if (len < sizeof(tlv)) { | |
107 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type); | |
108 | return (-1); | |
109 | } | |
110 | ||
111 | memcpy(&tlv, buf, TLV_HDR_SIZE); | |
8819fc38 | 112 | tlv_type = ntohs(tlv.type); |
8429abe0 RW |
113 | tlv_len = ntohs(tlv.length); |
114 | if (tlv_len + TLV_HDR_SIZE > len) { | |
115 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type); | |
116 | return (-1); | |
117 | } | |
118 | buf += TLV_HDR_SIZE; | |
119 | len -= TLV_HDR_SIZE; | |
120 | ||
8819fc38 RW |
121 | /* |
122 | * RFC 5561 - Section 6: | |
123 | * "The S-bit of a Capability Parameter in an Initialization | |
124 | * message MUST be 1 and SHOULD be ignored on receipt". | |
125 | */ | |
126 | switch (tlv_type) { | |
8429abe0 RW |
127 | case TLV_TYPE_ATMSESSIONPAR: |
128 | session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type); | |
129 | return (-1); | |
130 | case TLV_TYPE_FRSESSION: | |
131 | session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type); | |
132 | return (-1); | |
8819fc38 RW |
133 | case TLV_TYPE_DYNAMIC_CAP: |
134 | if (tlv_len != CAP_TLV_DYNAMIC_LEN) { | |
135 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, | |
136 | msg.type); | |
137 | return (-1); | |
138 | } | |
139 | ||
140 | if (caps_rcvd & F_CAP_TLV_RCVD_DYNAMIC) { | |
141 | session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, | |
142 | msg.type); | |
143 | return (-1); | |
144 | } | |
145 | caps_rcvd |= F_CAP_TLV_RCVD_DYNAMIC; | |
146 | ||
147 | nbr->flags |= F_NBR_CAP_DYNAMIC; | |
148 | ||
149 | log_debug("%s: lsr-id %s announced the Dynamic " | |
150 | "Capability Announcement capability", __func__, | |
151 | inet_ntoa(nbr->id)); | |
152 | break; | |
d4afb819 RW |
153 | case TLV_TYPE_TWCARD_CAP: |
154 | if (tlv_len != CAP_TLV_TWCARD_LEN) { | |
155 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, | |
156 | msg.type); | |
157 | return (-1); | |
158 | } | |
159 | ||
160 | if (caps_rcvd & F_CAP_TLV_RCVD_TWCARD) { | |
161 | session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, | |
162 | msg.type); | |
163 | return (-1); | |
164 | } | |
165 | caps_rcvd |= F_CAP_TLV_RCVD_TWCARD; | |
166 | ||
167 | nbr->flags |= F_NBR_CAP_TWCARD; | |
168 | ||
169 | log_debug("%s: lsr-id %s announced the Typed Wildcard " | |
170 | "FEC capability", __func__, inet_ntoa(nbr->id)); | |
171 | break; | |
257799cd RW |
172 | case TLV_TYPE_UNOTIF_CAP: |
173 | if (tlv_len != CAP_TLV_UNOTIF_LEN) { | |
174 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, | |
175 | msg.type); | |
176 | return (-1); | |
177 | } | |
178 | ||
179 | if (caps_rcvd & F_CAP_TLV_RCVD_UNOTIF) { | |
180 | session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, | |
181 | msg.type); | |
182 | return (-1); | |
183 | } | |
184 | caps_rcvd |= F_CAP_TLV_RCVD_UNOTIF; | |
185 | ||
186 | nbr->flags |= F_NBR_CAP_UNOTIF; | |
187 | ||
188 | log_debug("%s: lsr-id %s announced the Unrecognized " | |
189 | "Notification capability", __func__, | |
190 | inet_ntoa(nbr->id)); | |
191 | break; | |
8429abe0 RW |
192 | default: |
193 | if (!(ntohs(tlv.type) & UNKNOWN_FLAG)) | |
8819fc38 RW |
194 | send_notification_rtlvs(nbr, S_UNSSUPORTDCAP, |
195 | msg.id, msg.type, tlv_type, tlv_len, buf); | |
8429abe0 RW |
196 | /* ignore unknown tlv */ |
197 | break; | |
198 | } | |
199 | buf += tlv_len; | |
200 | len -= tlv_len; | |
201 | } | |
202 | ||
203 | nbr->keepalive = min(nbr_get_keepalive(nbr->af, nbr->id), | |
204 | ntohs(sess.keepalive_time)); | |
205 | ||
206 | max_pdu_len = ntohs(sess.max_pdu_len); | |
207 | /* | |
208 | * RFC 5036 - Section 3.5.3: | |
209 | * "A value of 255 or less specifies the default maximum length of | |
210 | * 4096 octets". | |
211 | */ | |
212 | if (max_pdu_len <= 255) | |
213 | max_pdu_len = LDP_MAX_LEN; | |
214 | nbr->max_pdu_len = min(max_pdu_len, LDP_MAX_LEN); | |
215 | ||
216 | nbr_fsm(nbr, NBR_EVT_INIT_RCVD); | |
217 | ||
218 | return (0); | |
219 | } | |
220 | ||
8819fc38 RW |
221 | void |
222 | send_capability(struct nbr *nbr, uint16_t capability, int enable) | |
223 | { | |
224 | struct ibuf *buf; | |
225 | uint16_t size; | |
226 | int err = 0; | |
227 | ||
228 | log_debug("%s: lsr-id %s", __func__, inet_ntoa(nbr->id)); | |
229 | ||
230 | size = LDP_HDR_SIZE + LDP_MSG_SIZE + CAP_TLV_DYNAMIC_SIZE; | |
231 | if ((buf = ibuf_open(size)) == NULL) | |
232 | fatal(__func__); | |
233 | ||
234 | err |= gen_ldp_hdr(buf, size); | |
235 | size -= LDP_HDR_SIZE; | |
236 | err |= gen_msg_hdr(buf, MSG_TYPE_CAPABILITY, size); | |
237 | ||
238 | switch (capability) { | |
d4afb819 RW |
239 | case TLV_TYPE_TWCARD_CAP: |
240 | err |= gen_cap_twcard_tlv(buf, enable); | |
241 | break; | |
257799cd RW |
242 | case TLV_TYPE_UNOTIF_CAP: |
243 | err |= gen_cap_unotif_tlv(buf, enable); | |
244 | break; | |
8819fc38 RW |
245 | case TLV_TYPE_DYNAMIC_CAP: |
246 | /* | |
247 | * RFC 5561 - Section 9: | |
248 | * "An LDP speaker MUST NOT include the Dynamic Capability | |
249 | * Announcement Parameter in Capability messages sent to | |
250 | * its peers". | |
251 | */ | |
252 | /* FALLTHROUGH */ | |
253 | default: | |
254 | fatalx("send_capability: unsupported capability"); | |
255 | } | |
256 | ||
257 | if (err) { | |
258 | ibuf_free(buf); | |
259 | return; | |
260 | } | |
261 | ||
262 | evbuf_enqueue(&nbr->tcp->wbuf, buf); | |
263 | nbr_fsm(nbr, NBR_EVT_PDU_SENT); | |
0f7b5df9 | 264 | nbr->stats.capability_sent++; |
8819fc38 RW |
265 | } |
266 | ||
267 | int | |
268 | recv_capability(struct nbr *nbr, char *buf, uint16_t len) | |
269 | { | |
270 | struct ldp_msg msg; | |
d4afb819 RW |
271 | int enable = 0; |
272 | int caps_rcvd = 0; | |
8819fc38 RW |
273 | |
274 | log_debug("%s: lsr-id %s", __func__, inet_ntoa(nbr->id)); | |
275 | ||
276 | memcpy(&msg, buf, sizeof(msg)); | |
277 | buf += LDP_MSG_SIZE; | |
278 | len -= LDP_MSG_SIZE; | |
279 | ||
280 | /* Optional Parameters */ | |
281 | while (len > 0) { | |
282 | struct tlv tlv; | |
283 | uint16_t tlv_type; | |
284 | uint16_t tlv_len; | |
d4afb819 | 285 | uint8_t reserved; |
8819fc38 RW |
286 | |
287 | if (len < sizeof(tlv)) { | |
288 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type); | |
289 | return (-1); | |
290 | } | |
291 | ||
292 | memcpy(&tlv, buf, TLV_HDR_SIZE); | |
293 | tlv_type = ntohs(tlv.type); | |
294 | tlv_len = ntohs(tlv.length); | |
295 | if (tlv_len + TLV_HDR_SIZE > len) { | |
296 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type); | |
297 | return (-1); | |
298 | } | |
299 | buf += TLV_HDR_SIZE; | |
300 | len -= TLV_HDR_SIZE; | |
301 | ||
302 | switch (tlv_type) { | |
d4afb819 RW |
303 | case TLV_TYPE_TWCARD_CAP: |
304 | if (tlv_len != CAP_TLV_TWCARD_LEN) { | |
305 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, | |
306 | msg.type); | |
307 | return (-1); | |
308 | } | |
309 | ||
310 | if (caps_rcvd & F_CAP_TLV_RCVD_TWCARD) { | |
311 | session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, | |
312 | msg.type); | |
313 | return (-1); | |
314 | } | |
315 | caps_rcvd |= F_CAP_TLV_RCVD_TWCARD; | |
316 | ||
317 | memcpy(&reserved, buf, sizeof(reserved)); | |
318 | enable = reserved & STATE_BIT; | |
319 | if (enable) | |
320 | nbr->flags |= F_NBR_CAP_TWCARD; | |
321 | else | |
322 | nbr->flags &= ~F_NBR_CAP_TWCARD; | |
323 | ||
324 | log_debug("%s: lsr-id %s %s the Typed Wildcard FEC " | |
325 | "capability", __func__, inet_ntoa(nbr->id), | |
326 | (enable) ? "announced" : "withdrew"); | |
327 | break; | |
257799cd RW |
328 | case TLV_TYPE_UNOTIF_CAP: |
329 | if (tlv_len != CAP_TLV_UNOTIF_LEN) { | |
330 | session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, | |
331 | msg.type); | |
332 | return (-1); | |
333 | } | |
334 | ||
335 | if (caps_rcvd & F_CAP_TLV_RCVD_UNOTIF) { | |
336 | session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, | |
337 | msg.type); | |
338 | return (-1); | |
339 | } | |
340 | caps_rcvd |= F_CAP_TLV_RCVD_UNOTIF; | |
341 | ||
342 | memcpy(&reserved, buf, sizeof(reserved)); | |
343 | enable = reserved & STATE_BIT; | |
344 | if (enable) | |
345 | nbr->flags |= F_NBR_CAP_UNOTIF; | |
346 | else | |
347 | nbr->flags &= ~F_NBR_CAP_UNOTIF; | |
348 | ||
349 | log_debug("%s: lsr-id %s %s the Unrecognized " | |
350 | "Notification capability", __func__, | |
351 | inet_ntoa(nbr->id), (enable) ? "announced" : | |
352 | "withdrew"); | |
353 | break; | |
8819fc38 RW |
354 | case TLV_TYPE_DYNAMIC_CAP: |
355 | /* | |
356 | * RFC 5561 - Section 9: | |
357 | * "An LDP speaker that receives a Capability message | |
358 | * from a peer that includes the Dynamic Capability | |
359 | * Announcement Parameter SHOULD silently ignore the | |
360 | * parameter and process any other Capability Parameters | |
361 | * in the message". | |
362 | */ | |
363 | /* FALLTHROUGH */ | |
364 | default: | |
365 | if (!(ntohs(tlv.type) & UNKNOWN_FLAG)) | |
366 | send_notification_rtlvs(nbr, S_UNSSUPORTDCAP, | |
367 | msg.id, msg.type, tlv_type, tlv_len, buf); | |
368 | /* ignore unknown tlv */ | |
369 | break; | |
370 | } | |
371 | buf += tlv_len; | |
372 | len -= tlv_len; | |
373 | } | |
374 | ||
375 | nbr_fsm(nbr, NBR_EVT_PDU_RCVD); | |
376 | ||
377 | return (0); | |
378 | } | |
379 | ||
8429abe0 RW |
380 | static int |
381 | gen_init_prms_tlv(struct ibuf *buf, struct nbr *nbr) | |
382 | { | |
383 | struct sess_prms_tlv parms; | |
384 | ||
385 | memset(&parms, 0, sizeof(parms)); | |
386 | parms.type = htons(TLV_TYPE_COMMONSESSION); | |
387 | parms.length = htons(SESS_PRMS_LEN); | |
388 | parms.proto_version = htons(LDP_VERSION); | |
389 | parms.keepalive_time = htons(nbr_get_keepalive(nbr->af, nbr->id)); | |
390 | parms.reserved = 0; | |
391 | parms.pvlim = 0; | |
392 | parms.max_pdu_len = 0; | |
393 | parms.lsr_id = nbr->id.s_addr; | |
394 | parms.lspace_id = 0; | |
395 | ||
396 | return (ibuf_add(buf, &parms, SESS_PRMS_SIZE)); | |
397 | } | |
8819fc38 RW |
398 | |
399 | static int | |
400 | gen_cap_dynamic_tlv(struct ibuf *buf) | |
401 | { | |
402 | struct capability_tlv cap; | |
403 | ||
404 | memset(&cap, 0, sizeof(cap)); | |
405 | cap.type = htons(TLV_TYPE_DYNAMIC_CAP); | |
406 | cap.length = htons(CAP_TLV_DYNAMIC_LEN); | |
407 | /* the S-bit is always 1 for the Dynamic Capability Announcement */ | |
408 | cap.reserved = STATE_BIT; | |
409 | ||
410 | return (ibuf_add(buf, &cap, CAP_TLV_DYNAMIC_SIZE)); | |
411 | } | |
d4afb819 RW |
412 | |
413 | static int | |
414 | gen_cap_twcard_tlv(struct ibuf *buf, int enable) | |
415 | { | |
416 | struct capability_tlv cap; | |
417 | ||
418 | memset(&cap, 0, sizeof(cap)); | |
419 | cap.type = htons(TLV_TYPE_TWCARD_CAP); | |
420 | cap.length = htons(CAP_TLV_TWCARD_LEN); | |
421 | if (enable) | |
422 | cap.reserved = STATE_BIT; | |
423 | ||
424 | return (ibuf_add(buf, &cap, CAP_TLV_TWCARD_SIZE)); | |
425 | } | |
257799cd RW |
426 | |
427 | static int | |
428 | gen_cap_unotif_tlv(struct ibuf *buf, int enable) | |
429 | { | |
430 | struct capability_tlv cap; | |
431 | ||
432 | memset(&cap, 0, sizeof(cap)); | |
433 | cap.type = htons(TLV_TYPE_UNOTIF_CAP); | |
434 | cap.length = htons(CAP_TLV_UNOTIF_LEN); | |
435 | if (enable) | |
436 | cap.reserved = STATE_BIT; | |
437 | ||
438 | return (ibuf_add(buf, &cap, CAP_TLV_UNOTIF_SIZE)); | |
439 | } |