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958b450c | 1 | /* BGP I/O. |
51abb4b4 | 2 | * Implements packet I/O in a pthread. |
958b450c | 3 | * Copyright (C) 2017 Cumulus Networks |
51abb4b4 | 4 | * Quentin Young |
958b450c QY |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; see the file COPYING; if not, write to the | |
18 | * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
19 | * MA 02110-1301 USA | |
56257a44 QY |
20 | */ |
21 | ||
95158b0c | 22 | /* clang-format off */ |
42cf651e | 23 | #include <zebra.h> |
95158b0c | 24 | #include <pthread.h> // for pthread_mutex_unlock, pthread_mutex_lock |
56257a44 | 25 | |
95158b0c QY |
26 | #include "frr_pthread.h" // for frr_pthread_get, frr_pthread |
27 | #include "linklist.h" // for list_delete, list_delete_all_node, lis... | |
28 | #include "log.h" // for zlog_debug, safe_strerror, zlog_err | |
29 | #include "memory.h" // for MTYPE_TMP, XCALLOC, XFREE | |
30 | #include "network.h" // for ERRNO_IO_RETRY | |
31 | #include "stream.h" // for stream_get_endp, stream_getw_from, str... | |
74ffbfe6 | 32 | #include "ringbuf.h" // for ringbuf_remain, ringbuf_peek, ringbuf_... |
95158b0c QY |
33 | #include "thread.h" // for THREAD_OFF, THREAD_ARG, thread, thread... |
34 | #include "zassert.h" // for assert | |
56257a44 | 35 | |
42cf651e | 36 | #include "bgpd/bgp_io.h" |
95158b0c QY |
37 | #include "bgpd/bgp_debug.h" // for bgp_debug_neighbor_events, bgp_type_str |
38 | #include "bgpd/bgp_fsm.h" // for BGP_EVENT_ADD, bgp_event | |
39 | #include "bgpd/bgp_packet.h" // for bgp_notify_send_with_data, bgp_notify... | |
40 | #include "bgpd/bgpd.h" // for peer, BGP_MARKER_SIZE, bgp_master, bm | |
41 | /* clang-format on */ | |
56257a44 | 42 | |
424ab01d QY |
43 | /* forward declarations */ |
44 | static uint16_t bgp_write(struct peer *); | |
45 | static uint16_t bgp_read(struct peer *); | |
46 | static int bgp_process_writes(struct thread *); | |
47 | static int bgp_process_reads(struct thread *); | |
48 | static bool validate_header(struct peer *); | |
56257a44 | 49 | |
424ab01d | 50 | /* generic i/o status codes */ |
95158b0c QY |
51 | #define BGP_IO_TRANS_ERR (1 << 0) // EAGAIN or similar occurred |
52 | #define BGP_IO_FATAL_ERR (1 << 1) // some kind of fatal TCP error | |
56257a44 | 53 | |
a715eab3 | 54 | /* Thread external API ----------------------------------------------------- */ |
56257a44 | 55 | |
424ab01d | 56 | void bgp_writes_on(struct peer *peer) |
56257a44 | 57 | { |
a715eab3 QY |
58 | struct frr_pthread *fpt = frr_pthread_get(PTHREAD_IO); |
59 | assert(fpt->running); | |
f09a656d | 60 | |
424ab01d QY |
61 | assert(peer->status != Deleted); |
62 | assert(peer->obuf); | |
63 | assert(peer->ibuf); | |
64 | assert(peer->ibuf_work); | |
387f984e QY |
65 | assert(!peer->t_connect_check_r); |
66 | assert(!peer->t_connect_check_w); | |
424ab01d | 67 | assert(peer->fd); |
56257a44 | 68 | |
b750b0ba QY |
69 | thread_add_write(fpt->master, bgp_process_writes, peer, peer->fd, |
70 | &peer->t_write); | |
71 | SET_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON); | |
424ab01d | 72 | } |
56257a44 | 73 | |
424ab01d QY |
74 | void bgp_writes_off(struct peer *peer) |
75 | { | |
151044ce | 76 | struct frr_pthread *fpt = frr_pthread_get(PTHREAD_IO); |
a715eab3 | 77 | assert(fpt->running); |
151044ce | 78 | |
b750b0ba QY |
79 | thread_cancel_async(fpt->master, &peer->t_write, NULL); |
80 | THREAD_OFF(peer->t_generate_updgrp_packets); | |
56257a44 | 81 | |
b750b0ba | 82 | UNSET_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON); |
56257a44 QY |
83 | } |
84 | ||
424ab01d | 85 | void bgp_reads_on(struct peer *peer) |
56257a44 | 86 | { |
a715eab3 QY |
87 | struct frr_pthread *fpt = frr_pthread_get(PTHREAD_IO); |
88 | assert(fpt->running); | |
f09a656d | 89 | |
424ab01d QY |
90 | assert(peer->status != Deleted); |
91 | assert(peer->ibuf); | |
92 | assert(peer->fd); | |
93 | assert(peer->ibuf_work); | |
424ab01d | 94 | assert(peer->obuf); |
387f984e QY |
95 | assert(!peer->t_connect_check_r); |
96 | assert(!peer->t_connect_check_w); | |
424ab01d QY |
97 | assert(peer->fd); |
98 | ||
b750b0ba QY |
99 | thread_add_read(fpt->master, bgp_process_reads, peer, peer->fd, |
100 | &peer->t_read); | |
101 | ||
102 | SET_FLAG(peer->thread_flags, PEER_THREAD_READS_ON); | |
56257a44 QY |
103 | } |
104 | ||
424ab01d | 105 | void bgp_reads_off(struct peer *peer) |
56257a44 | 106 | { |
151044ce | 107 | struct frr_pthread *fpt = frr_pthread_get(PTHREAD_IO); |
a715eab3 | 108 | assert(fpt->running); |
151044ce | 109 | |
b750b0ba QY |
110 | thread_cancel_async(fpt->master, &peer->t_read, NULL); |
111 | THREAD_OFF(peer->t_process_packet); | |
56257a44 | 112 | |
b750b0ba | 113 | UNSET_FLAG(peer->thread_flags, PEER_THREAD_READS_ON); |
56257a44 QY |
114 | } |
115 | ||
a715eab3 | 116 | /* Thread internal functions ----------------------------------------------- */ |
51abb4b4 | 117 | |
a715eab3 | 118 | /* |
51abb4b4 | 119 | * Called from I/O pthread when a file descriptor has become ready for writing. |
424ab01d QY |
120 | */ |
121 | static int bgp_process_writes(struct thread *thread) | |
56257a44 | 122 | { |
424ab01d QY |
123 | static struct peer *peer; |
124 | peer = THREAD_ARG(thread); | |
125 | uint16_t status; | |
b750b0ba | 126 | bool reschedule; |
bbac44ac | 127 | bool fatal = false; |
424ab01d QY |
128 | |
129 | if (peer->fd < 0) | |
130 | return -1; | |
131 | ||
132 | struct frr_pthread *fpt = frr_pthread_get(PTHREAD_IO); | |
133 | ||
424ab01d | 134 | pthread_mutex_lock(&peer->io_mtx); |
56257a44 | 135 | { |
424ab01d QY |
136 | status = bgp_write(peer); |
137 | reschedule = (stream_fifo_head(peer->obuf) != NULL); | |
138 | } | |
139 | pthread_mutex_unlock(&peer->io_mtx); | |
56257a44 | 140 | |
a715eab3 QY |
141 | /* no problem */ |
142 | if (CHECK_FLAG(status, BGP_IO_TRANS_ERR)) { | |
56257a44 | 143 | } |
56257a44 | 144 | |
a715eab3 | 145 | /* problem */ |
bbac44ac | 146 | if (CHECK_FLAG(status, BGP_IO_FATAL_ERR)) { |
a715eab3 | 147 | reschedule = false; |
bbac44ac QY |
148 | fatal = true; |
149 | } | |
424ab01d QY |
150 | |
151 | if (reschedule) { | |
152 | thread_add_write(fpt->master, bgp_process_writes, peer, | |
153 | peer->fd, &peer->t_write); | |
b785b7ad QY |
154 | } else if (!fatal) { |
155 | BGP_TIMER_ON(peer->t_generate_updgrp_packets, | |
156 | bgp_generate_updgrp_packets, 0); | |
424ab01d QY |
157 | } |
158 | ||
159 | return 0; | |
56257a44 QY |
160 | } |
161 | ||
a715eab3 | 162 | /* |
51abb4b4 QY |
163 | * Called from I/O pthread when a file descriptor has become ready for reading, |
164 | * or has hung up. | |
9eb217ff QY |
165 | * |
166 | * We read as much data as possible, process as many packets as we can and | |
167 | * place them on peer->ibuf for secondary processing by the main thread. | |
56257a44 | 168 | */ |
424ab01d | 169 | static int bgp_process_reads(struct thread *thread) |
56257a44 | 170 | { |
e11eeb8c QY |
171 | /* clang-format off */ |
172 | static struct peer *peer; // peer to read from | |
173 | uint16_t status; // bgp_read status code | |
174 | bool more = true; // whether we got more data | |
175 | bool fatal = false; // whether fatal error occurred | |
176 | bool added_pkt = false; // whether we pushed onto ->ibuf | |
177 | bool header_valid = true; // whether header is valid | |
178 | /* clang-format on */ | |
9eb217ff | 179 | |
424ab01d | 180 | peer = THREAD_ARG(thread); |
424ab01d QY |
181 | |
182 | if (peer->fd < 0) | |
183 | return -1; | |
184 | ||
185 | struct frr_pthread *fpt = frr_pthread_get(PTHREAD_IO); | |
186 | ||
424ab01d | 187 | pthread_mutex_lock(&peer->io_mtx); |
56257a44 | 188 | { |
424ab01d QY |
189 | status = bgp_read(peer); |
190 | } | |
191 | pthread_mutex_unlock(&peer->io_mtx); | |
192 | ||
9eb217ff QY |
193 | /* error checking phase */ |
194 | if (CHECK_FLAG(status, BGP_IO_TRANS_ERR)) { | |
195 | /* no problem; just don't process packets */ | |
196 | more = false; | |
197 | } | |
424ab01d | 198 | |
9eb217ff QY |
199 | if (CHECK_FLAG(status, BGP_IO_FATAL_ERR)) { |
200 | /* problem; tear down session */ | |
201 | more = false; | |
202 | fatal = true; | |
56257a44 | 203 | } |
56257a44 | 204 | |
9eb217ff QY |
205 | while (more) { |
206 | /* static buffer for transferring packets */ | |
207 | static unsigned char pktbuf[BGP_MAX_PACKET_SIZE]; | |
208 | /* shorter alias to peer's input buffer */ | |
74ffbfe6 | 209 | struct ringbuf *ibw = peer->ibuf_work; |
9eb217ff | 210 | /* packet size as given by header */ |
74ffbfe6 | 211 | uint16_t pktsize = 0; |
9eb217ff QY |
212 | |
213 | /* check that we have enough data for a header */ | |
74ffbfe6 | 214 | if (ringbuf_remain(ibw) < BGP_HEADER_SIZE) |
9eb217ff | 215 | break; |
424ab01d | 216 | |
9eb217ff | 217 | /* validate header */ |
424ab01d | 218 | header_valid = validate_header(peer); |
9eb217ff | 219 | |
424ab01d | 220 | if (!header_valid) { |
9eb217ff QY |
221 | fatal = true; |
222 | break; | |
424ab01d | 223 | } |
424ab01d | 224 | |
9eb217ff | 225 | /* header is valid; retrieve packet size */ |
74ffbfe6 QY |
226 | ringbuf_peek(ibw, BGP_MARKER_SIZE, &pktsize, sizeof(pktsize)); |
227 | ||
228 | pktsize = ntohs(pktsize); | |
424ab01d | 229 | |
9eb217ff QY |
230 | /* if this fails we are seriously screwed */ |
231 | assert(pktsize <= BGP_MAX_PACKET_SIZE); | |
232 | ||
a715eab3 QY |
233 | /* |
234 | * If we have that much data, chuck it into its own | |
235 | * stream and append to input queue for processing. | |
236 | */ | |
74ffbfe6 | 237 | if (ringbuf_remain(ibw) >= pktsize) { |
9eb217ff | 238 | struct stream *pkt = stream_new(pktsize); |
74ffbfe6 | 239 | assert(ringbuf_get(ibw, pktbuf, pktsize) == pktsize); |
9eb217ff QY |
240 | stream_put(pkt, pktbuf, pktsize); |
241 | ||
242 | pthread_mutex_lock(&peer->io_mtx); | |
243 | { | |
244 | stream_fifo_push(peer->ibuf, pkt); | |
245 | } | |
246 | pthread_mutex_unlock(&peer->io_mtx); | |
247 | ||
248 | added_pkt = true; | |
249 | } else | |
250 | break; | |
251 | } | |
252 | ||
74ffbfe6 | 253 | assert(ringbuf_space(peer->ibuf_work) >= BGP_MAX_PACKET_SIZE); |
9eb217ff QY |
254 | |
255 | /* handle invalid header */ | |
256 | if (fatal) { | |
9eb217ff | 257 | /* wipe buffer just in case someone screwed up */ |
74ffbfe6 | 258 | ringbuf_wipe(peer->ibuf_work); |
9eb217ff | 259 | } else { |
424ab01d QY |
260 | thread_add_read(fpt->master, bgp_process_reads, peer, peer->fd, |
261 | &peer->t_read); | |
9eb217ff | 262 | if (added_pkt) |
7a86aa5a QY |
263 | thread_add_timer_msec(bm->master, bgp_process_packet, |
264 | peer, 0, &peer->t_process_packet); | |
9eb217ff | 265 | } |
424ab01d QY |
266 | |
267 | return 0; | |
56257a44 QY |
268 | } |
269 | ||
a715eab3 | 270 | /* |
56257a44 QY |
271 | * Flush peer output buffer. |
272 | * | |
273 | * This function pops packets off of peer->obuf and writes them to peer->fd. | |
274 | * The amount of packets written is equal to the minimum of peer->wpkt_quanta | |
424ab01d | 275 | * and the number of packets on the output buffer, unless an error occurs. |
56257a44 QY |
276 | * |
277 | * If write() returns an error, the appropriate FSM event is generated. | |
278 | * | |
279 | * The return value is equal to the number of packets written | |
280 | * (which may be zero). | |
281 | */ | |
424ab01d | 282 | static uint16_t bgp_write(struct peer *peer) |
56257a44 | 283 | { |
d7c0a89a | 284 | uint8_t type; |
56257a44 QY |
285 | struct stream *s; |
286 | int num; | |
287 | int update_last_write = 0; | |
288 | unsigned int count = 0; | |
eb2277cf | 289 | uint32_t uo = 0; |
424ab01d | 290 | uint16_t status = 0; |
555e09d4 | 291 | uint32_t wpkt_quanta_old; |
56257a44 | 292 | |
996c9314 LB |
293 | wpkt_quanta_old = atomic_load_explicit(&peer->bgp->wpkt_quanta, |
294 | memory_order_relaxed); | |
555e09d4 QY |
295 | |
296 | while (count < wpkt_quanta_old && (s = stream_fifo_head(peer->obuf))) { | |
56257a44 QY |
297 | int writenum; |
298 | do { | |
299 | writenum = stream_get_endp(s) - stream_get_getp(s); | |
300 | num = write(peer->fd, STREAM_PNT(s), writenum); | |
301 | ||
302 | if (num < 0) { | |
424ab01d | 303 | if (!ERRNO_IO_RETRY(errno)) { |
56257a44 | 304 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
424ab01d QY |
305 | SET_FLAG(status, BGP_IO_FATAL_ERR); |
306 | } else { | |
307 | SET_FLAG(status, BGP_IO_TRANS_ERR); | |
308 | } | |
56257a44 QY |
309 | |
310 | goto done; | |
a715eab3 | 311 | } else if (num != writenum) |
56257a44 QY |
312 | stream_forward_getp(s, num); |
313 | ||
314 | } while (num != writenum); | |
315 | ||
316 | /* Retrieve BGP packet type. */ | |
317 | stream_set_getp(s, BGP_MARKER_SIZE + 2); | |
318 | type = stream_getc(s); | |
319 | ||
320 | switch (type) { | |
321 | case BGP_MSG_OPEN: | |
1588f6f4 QY |
322 | atomic_fetch_add_explicit(&peer->open_out, 1, |
323 | memory_order_relaxed); | |
56257a44 QY |
324 | break; |
325 | case BGP_MSG_UPDATE: | |
1588f6f4 QY |
326 | atomic_fetch_add_explicit(&peer->update_out, 1, |
327 | memory_order_relaxed); | |
eb2277cf | 328 | uo++; |
56257a44 QY |
329 | break; |
330 | case BGP_MSG_NOTIFY: | |
1588f6f4 QY |
331 | atomic_fetch_add_explicit(&peer->notify_out, 1, |
332 | memory_order_relaxed); | |
56257a44 QY |
333 | /* Double start timer. */ |
334 | peer->v_start *= 2; | |
335 | ||
336 | /* Overflow check. */ | |
337 | if (peer->v_start >= (60 * 2)) | |
338 | peer->v_start = (60 * 2); | |
339 | ||
a715eab3 QY |
340 | /* |
341 | * Handle Graceful Restart case where the state changes | |
342 | * to Connect instead of Idle. | |
343 | */ | |
56257a44 QY |
344 | BGP_EVENT_ADD(peer, BGP_Stop); |
345 | goto done; | |
346 | ||
347 | case BGP_MSG_KEEPALIVE: | |
1588f6f4 QY |
348 | atomic_fetch_add_explicit(&peer->keepalive_out, 1, |
349 | memory_order_relaxed); | |
56257a44 QY |
350 | break; |
351 | case BGP_MSG_ROUTE_REFRESH_NEW: | |
352 | case BGP_MSG_ROUTE_REFRESH_OLD: | |
1588f6f4 QY |
353 | atomic_fetch_add_explicit(&peer->refresh_out, 1, |
354 | memory_order_relaxed); | |
56257a44 QY |
355 | break; |
356 | case BGP_MSG_CAPABILITY: | |
1588f6f4 QY |
357 | atomic_fetch_add_explicit(&peer->dynamic_cap_out, 1, |
358 | memory_order_relaxed); | |
56257a44 QY |
359 | break; |
360 | } | |
361 | ||
362 | count++; | |
424ab01d | 363 | |
56257a44 QY |
364 | stream_free(stream_fifo_pop(peer->obuf)); |
365 | update_last_write = 1; | |
366 | } | |
367 | ||
368 | done : { | |
eb2277cf LB |
369 | /* |
370 | * Update last_update if UPDATEs were written. | |
371 | * Note: that these are only updated at end, | |
372 | * not per message (i.e., per loop) | |
373 | */ | |
374 | if (uo) | |
1588f6f4 QY |
375 | atomic_store_explicit(&peer->last_update, bgp_clock(), |
376 | memory_order_relaxed); | |
56257a44 | 377 | |
5c075a90 | 378 | /* If we TXed any flavor of packet */ |
56257a44 | 379 | if (update_last_write) |
1588f6f4 QY |
380 | atomic_store_explicit(&peer->last_write, bgp_clock(), |
381 | memory_order_relaxed); | |
56257a44 QY |
382 | } |
383 | ||
424ab01d QY |
384 | return status; |
385 | } | |
386 | ||
a715eab3 | 387 | /* |
51abb4b4 | 388 | * Reads a chunk of data from peer->fd into peer->ibuf_work. |
424ab01d | 389 | * |
51abb4b4 | 390 | * @return status flag (see top-of-file) |
424ab01d QY |
391 | */ |
392 | static uint16_t bgp_read(struct peer *peer) | |
393 | { | |
b750b0ba QY |
394 | size_t readsize; // how many bytes we want to read |
395 | ssize_t nbytes; // how many bytes we actually read | |
424ab01d | 396 | uint16_t status = 0; |
74ffbfe6 | 397 | static uint8_t ibw[BGP_MAX_PACKET_SIZE * BGP_READ_PACKET_MAX]; |
424ab01d | 398 | |
74ffbfe6 QY |
399 | readsize = MIN(ringbuf_space(peer->ibuf_work), sizeof(ibw)); |
400 | nbytes = read(peer->fd, ibw, readsize); | |
424ab01d | 401 | |
74ffbfe6 QY |
402 | /* EAGAIN or EWOULDBLOCK; come back later */ |
403 | if (nbytes < 0 && ERRNO_IO_RETRY(errno)) { | |
404 | SET_FLAG(status, BGP_IO_TRANS_ERR); | |
996c9314 | 405 | /* Fatal error; tear down session */ |
74ffbfe6 | 406 | } else if (nbytes < 0) { |
85145b62 QY |
407 | zlog_err("%s [Error] bgp_read_packet error: %s", peer->host, |
408 | safe_strerror(errno)); | |
409 | ||
410 | if (peer->status == Established) { | |
411 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_MODE)) { | |
412 | peer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
413 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
414 | } else | |
415 | peer->last_reset = PEER_DOWN_CLOSE_SESSION; | |
416 | } | |
424ab01d | 417 | |
85145b62 QY |
418 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
419 | SET_FLAG(status, BGP_IO_FATAL_ERR); | |
996c9314 | 420 | /* Received EOF / TCP session closed */ |
74ffbfe6 | 421 | } else if (nbytes == 0) { |
85145b62 QY |
422 | if (bgp_debug_neighbor_events(peer)) |
423 | zlog_debug("%s [Event] BGP connection closed fd %d", | |
424 | peer->host, peer->fd); | |
425 | ||
426 | if (peer->status == Established) { | |
427 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_MODE)) { | |
428 | peer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
429 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
430 | } else | |
431 | peer->last_reset = PEER_DOWN_CLOSE_SESSION; | |
424ab01d QY |
432 | } |
433 | ||
85145b62 QY |
434 | BGP_EVENT_ADD(peer, TCP_connection_closed); |
435 | SET_FLAG(status, BGP_IO_FATAL_ERR); | |
74ffbfe6 QY |
436 | } else { |
437 | assert(ringbuf_put(peer->ibuf_work, ibw, nbytes) | |
438 | == (size_t)nbytes); | |
424ab01d QY |
439 | } |
440 | ||
424ab01d QY |
441 | return status; |
442 | } | |
443 | ||
444 | /* | |
445 | * Called after we have read a BGP packet header. Validates marker, message | |
446 | * type and packet length. If any of these aren't correct, sends a notify. | |
74ffbfe6 QY |
447 | * |
448 | * Assumes that there are at least BGP_HEADER_SIZE readable bytes in the input | |
449 | * buffer. | |
424ab01d QY |
450 | */ |
451 | static bool validate_header(struct peer *peer) | |
452 | { | |
3fe63c29 QY |
453 | uint16_t size; |
454 | uint8_t type; | |
74ffbfe6 | 455 | struct ringbuf *pkt = peer->ibuf_work; |
424ab01d | 456 | |
74ffbfe6 QY |
457 | static uint8_t m_correct[BGP_MARKER_SIZE] = { |
458 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
459 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; | |
460 | uint8_t m_rx[BGP_MARKER_SIZE] = {0x00}; | |
442c9afb | 461 | |
74ffbfe6 QY |
462 | if (ringbuf_peek(pkt, 0, m_rx, BGP_MARKER_SIZE) != BGP_MARKER_SIZE) |
463 | return false; | |
464 | ||
465 | if (memcmp(m_correct, m_rx, BGP_MARKER_SIZE) != 0) { | |
442c9afb QY |
466 | bgp_notify_send(peer, BGP_NOTIFY_HEADER_ERR, |
467 | BGP_NOTIFY_HEADER_NOT_SYNC); | |
468 | return false; | |
469 | } | |
424ab01d | 470 | |
74ffbfe6 QY |
471 | /* Get size and type in network byte order. */ |
472 | ringbuf_peek(pkt, BGP_MARKER_SIZE, &size, sizeof(size)); | |
473 | ringbuf_peek(pkt, BGP_MARKER_SIZE + 2, &type, sizeof(type)); | |
474 | ||
475 | size = ntohs(size); | |
424ab01d QY |
476 | |
477 | /* BGP type check. */ | |
478 | if (type != BGP_MSG_OPEN && type != BGP_MSG_UPDATE | |
479 | && type != BGP_MSG_NOTIFY && type != BGP_MSG_KEEPALIVE | |
480 | && type != BGP_MSG_ROUTE_REFRESH_NEW | |
481 | && type != BGP_MSG_ROUTE_REFRESH_OLD | |
482 | && type != BGP_MSG_CAPABILITY) { | |
3fe63c29 | 483 | if (bgp_debug_neighbor_events(peer)) |
424ab01d QY |
484 | zlog_debug("%s unknown message type 0x%02x", peer->host, |
485 | type); | |
486 | ||
487 | bgp_notify_send_with_data(peer, BGP_NOTIFY_HEADER_ERR, | |
996c9314 LB |
488 | BGP_NOTIFY_HEADER_BAD_MESTYPE, &type, |
489 | 1); | |
424ab01d QY |
490 | return false; |
491 | } | |
492 | ||
3fe63c29 | 493 | /* Minimum packet length check. */ |
424ab01d QY |
494 | if ((size < BGP_HEADER_SIZE) || (size > BGP_MAX_PACKET_SIZE) |
495 | || (type == BGP_MSG_OPEN && size < BGP_MSG_OPEN_MIN_SIZE) | |
496 | || (type == BGP_MSG_UPDATE && size < BGP_MSG_UPDATE_MIN_SIZE) | |
497 | || (type == BGP_MSG_NOTIFY && size < BGP_MSG_NOTIFY_MIN_SIZE) | |
498 | || (type == BGP_MSG_KEEPALIVE && size != BGP_MSG_KEEPALIVE_MIN_SIZE) | |
499 | || (type == BGP_MSG_ROUTE_REFRESH_NEW | |
500 | && size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE) | |
501 | || (type == BGP_MSG_ROUTE_REFRESH_OLD | |
502 | && size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE) | |
503 | || (type == BGP_MSG_CAPABILITY | |
504 | && size < BGP_MSG_CAPABILITY_MIN_SIZE)) { | |
1588f6f4 | 505 | if (bgp_debug_neighbor_events(peer)) { |
424ab01d QY |
506 | zlog_debug("%s bad message length - %d for %s", |
507 | peer->host, size, | |
508 | type == 128 ? "ROUTE-REFRESH" | |
996c9314 | 509 | : bgp_type_str[(int)type]); |
1588f6f4 | 510 | } |
424ab01d | 511 | |
3fe63c29 QY |
512 | uint16_t nsize = htons(size); |
513 | ||
424ab01d QY |
514 | bgp_notify_send_with_data(peer, BGP_NOTIFY_HEADER_ERR, |
515 | BGP_NOTIFY_HEADER_BAD_MESLEN, | |
996c9314 | 516 | (unsigned char *)&nsize, 2); |
424ab01d QY |
517 | return false; |
518 | } | |
519 | ||
520 | return true; | |
56257a44 | 521 | } |