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2a333e0f | 1 | /* |
2 | * IP MSDP packet helper | |
3 | * Copyright (C) 2016 Cumulus Networks, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
896014f4 DL |
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 | |
2a333e0f | 18 | */ |
19 | #include <zebra.h> | |
20 | ||
21 | #include <lib/log.h> | |
22 | #include <lib/network.h> | |
23 | #include <lib/stream.h> | |
24 | #include <lib/thread.h> | |
3c72d654 | 25 | #include <lib/vty.h> |
3613d898 | 26 | #include <lib/lib_errors.h> |
2a333e0f | 27 | |
28 | #include "pimd.h" | |
29 | #include "pim_str.h" | |
d9ff4302 | 30 | #include "pim_errors.h" |
2a333e0f | 31 | |
32 | #include "pim_msdp.h" | |
33 | #include "pim_msdp_packet.h" | |
34 | #include "pim_msdp_socket.h" | |
35 | ||
d62a17ae | 36 | static char *pim_msdp_pkt_type_dump(enum pim_msdp_tlv type, char *buf, |
37 | int buf_size) | |
2a333e0f | 38 | { |
d62a17ae | 39 | switch (type) { |
40 | case PIM_MSDP_V4_SOURCE_ACTIVE: | |
41 | snprintf(buf, buf_size, "%s", "SA"); | |
42 | break; | |
43 | case PIM_MSDP_V4_SOURCE_ACTIVE_REQUEST: | |
44 | snprintf(buf, buf_size, "%s", "SA_REQ"); | |
45 | break; | |
46 | case PIM_MSDP_V4_SOURCE_ACTIVE_RESPONSE: | |
47 | snprintf(buf, buf_size, "%s", "SA_RESP"); | |
48 | break; | |
49 | case PIM_MSDP_KEEPALIVE: | |
50 | snprintf(buf, buf_size, "%s", "KA"); | |
51 | break; | |
52 | case PIM_MSDP_RESERVED: | |
53 | snprintf(buf, buf_size, "%s", "RSVD"); | |
54 | break; | |
55 | case PIM_MSDP_TRACEROUTE_PROGRESS: | |
56 | snprintf(buf, buf_size, "%s", "TRACE_PROG"); | |
57 | break; | |
58 | case PIM_MSDP_TRACEROUTE_REPLY: | |
59 | snprintf(buf, buf_size, "%s", "TRACE_REPLY"); | |
60 | break; | |
61 | default: | |
62 | snprintf(buf, buf_size, "UNK-%d", type); | |
63 | } | |
64 | return buf; | |
2a333e0f | 65 | } |
66 | ||
d62a17ae | 67 | static void pim_msdp_pkt_sa_dump_one(struct stream *s) |
15ad0c71 | 68 | { |
d62a17ae | 69 | struct prefix_sg sg; |
15ad0c71 | 70 | |
d62a17ae | 71 | /* just throw away the three reserved bytes */ |
72 | stream_get3(s); | |
73 | /* throw away the prefix length also */ | |
74 | stream_getc(s); | |
15ad0c71 | 75 | |
d62a17ae | 76 | memset(&sg, 0, sizeof(struct prefix_sg)); |
77 | sg.grp.s_addr = stream_get_ipv4(s); | |
78 | sg.src.s_addr = stream_get_ipv4(s); | |
15ad0c71 | 79 | |
d62a17ae | 80 | zlog_debug(" sg %s", pim_str_sg_dump(&sg)); |
15ad0c71 | 81 | } |
82 | ||
d62a17ae | 83 | static void pim_msdp_pkt_sa_dump(struct stream *s) |
15ad0c71 | 84 | { |
d62a17ae | 85 | int entry_cnt; |
86 | int i; | |
87 | struct in_addr rp; /* Last RP address associated with this SA */ | |
88 | ||
89 | entry_cnt = stream_getc(s); | |
90 | rp.s_addr = stream_get_ipv4(s); | |
91 | ||
92 | if (PIM_DEBUG_MSDP_PACKETS) { | |
93 | char rp_str[INET_ADDRSTRLEN]; | |
94 | pim_inet4_dump("<rp?>", rp, rp_str, sizeof(rp_str)); | |
95 | zlog_debug(" entry_cnt %d rp %s", entry_cnt, rp_str); | |
96 | } | |
97 | ||
98 | /* dump SAs */ | |
99 | for (i = 0; i < entry_cnt; ++i) { | |
100 | pim_msdp_pkt_sa_dump_one(s); | |
101 | } | |
15ad0c71 | 102 | } |
103 | ||
d62a17ae | 104 | static void pim_msdp_pkt_dump(struct pim_msdp_peer *mp, int type, int len, |
105 | bool rx, struct stream *s) | |
2a333e0f | 106 | { |
d62a17ae | 107 | char type_str[PIM_MSDP_PKT_TYPE_STRLEN]; |
2a333e0f | 108 | |
d62a17ae | 109 | pim_msdp_pkt_type_dump(type, type_str, sizeof(type_str)); |
2a333e0f | 110 | |
d62a17ae | 111 | zlog_debug("MSDP peer %s pkt %s type %s len %d", mp->key_str, |
112 | rx ? "rx" : "tx", type_str, len); | |
15ad0c71 | 113 | |
d62a17ae | 114 | if (!s) { |
115 | return; | |
116 | } | |
15ad0c71 | 117 | |
d62a17ae | 118 | switch (type) { |
119 | case PIM_MSDP_V4_SOURCE_ACTIVE: | |
120 | pim_msdp_pkt_sa_dump(s); | |
121 | break; | |
122 | default:; | |
123 | } | |
2a333e0f | 124 | } |
125 | ||
126 | /* Check file descriptor whether connect is established. */ | |
d62a17ae | 127 | static void pim_msdp_connect_check(struct pim_msdp_peer *mp) |
2a333e0f | 128 | { |
d62a17ae | 129 | int status; |
130 | socklen_t slen; | |
131 | int ret; | |
132 | ||
133 | if (mp->state != PIM_MSDP_CONNECTING) { | |
134 | /* if we are here it means we are not in a connecting or | |
135 | * established state | |
136 | * for now treat this as a fatal error */ | |
137 | pim_msdp_peer_reset_tcp_conn(mp, "invalid-state"); | |
138 | return; | |
139 | } | |
140 | ||
141 | PIM_MSDP_PEER_READ_OFF(mp); | |
142 | PIM_MSDP_PEER_WRITE_OFF(mp); | |
143 | ||
144 | /* Check file descriptor. */ | |
145 | slen = sizeof(status); | |
146 | ret = getsockopt(mp->fd, SOL_SOCKET, SO_ERROR, (void *)&status, &slen); | |
147 | ||
148 | /* If getsockopt is fail, this is fatal error. */ | |
149 | if (ret < 0) { | |
450971aa | 150 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 | 151 | "can't get sockopt for nonblocking connect"); |
d62a17ae | 152 | pim_msdp_peer_reset_tcp_conn(mp, "connect-failed"); |
153 | return; | |
154 | } | |
155 | ||
156 | /* When status is 0 then TCP connection is established. */ | |
157 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
158 | zlog_debug("MSDP peer %s pim_connect_check %s", mp->key_str, | |
159 | status ? "fail" : "success"); | |
160 | } | |
161 | if (status == 0) { | |
162 | pim_msdp_peer_established(mp); | |
163 | } else { | |
164 | pim_msdp_peer_reset_tcp_conn(mp, "connect-failed"); | |
165 | } | |
2a333e0f | 166 | } |
167 | ||
d62a17ae | 168 | static void pim_msdp_pkt_delete(struct pim_msdp_peer *mp) |
2a333e0f | 169 | { |
d62a17ae | 170 | stream_free(stream_fifo_pop(mp->obuf)); |
2a333e0f | 171 | } |
172 | ||
d62a17ae | 173 | static void pim_msdp_pkt_add(struct pim_msdp_peer *mp, struct stream *s) |
3c72d654 | 174 | { |
d62a17ae | 175 | stream_fifo_push(mp->obuf, s); |
3c72d654 | 176 | } |
177 | ||
d62a17ae | 178 | static void pim_msdp_write_proceed_actions(struct pim_msdp_peer *mp) |
2a333e0f | 179 | { |
d62a17ae | 180 | if (stream_fifo_head(mp->obuf)) { |
181 | PIM_MSDP_PEER_WRITE_ON(mp); | |
182 | } | |
2a333e0f | 183 | } |
184 | ||
d62a17ae | 185 | int pim_msdp_write(struct thread *thread) |
2a333e0f | 186 | { |
d62a17ae | 187 | struct pim_msdp_peer *mp; |
188 | struct stream *s; | |
189 | int num; | |
190 | enum pim_msdp_tlv type; | |
191 | int len; | |
192 | int work_cnt = 0; | |
193 | int work_max_cnt = 100; | |
194 | ||
195 | mp = THREAD_ARG(thread); | |
196 | mp->t_write = NULL; | |
197 | ||
198 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
199 | zlog_debug("MSDP peer %s pim_msdp_write", mp->key_str); | |
200 | } | |
201 | if (mp->fd < 0) { | |
202 | return -1; | |
203 | } | |
204 | ||
205 | /* check if TCP connection is established */ | |
206 | if (mp->state != PIM_MSDP_ESTABLISHED) { | |
207 | pim_msdp_connect_check(mp); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | s = stream_fifo_head(mp->obuf); | |
212 | if (!s) { | |
213 | pim_msdp_write_proceed_actions(mp); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | sockopt_cork(mp->fd, 1); | |
218 | ||
219 | /* Nonblocking write until TCP output buffer is full */ | |
220 | do { | |
221 | int writenum; | |
222 | ||
223 | /* Number of bytes to be sent */ | |
224 | writenum = stream_get_endp(s) - stream_get_getp(s); | |
225 | ||
226 | /* Call write() system call */ | |
2d34fb80 | 227 | num = write(mp->fd, stream_pnt(s), writenum); |
d62a17ae | 228 | if (num < 0) { |
229 | /* write failed either retry needed or error */ | |
230 | if (ERRNO_IO_RETRY(errno)) { | |
231 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
232 | zlog_debug( | |
233 | "MSDP peer %s pim_msdp_write io retry", | |
234 | mp->key_str); | |
235 | } | |
236 | break; | |
237 | } | |
238 | ||
239 | pim_msdp_peer_reset_tcp_conn(mp, "pkt-tx-failed"); | |
240 | return 0; | |
241 | } | |
242 | ||
243 | if (num != writenum) { | |
244 | /* Partial write */ | |
245 | stream_forward_getp(s, num); | |
246 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
247 | zlog_debug( | |
248 | "MSDP peer %s pim_msdp_partial_write", | |
249 | mp->key_str); | |
250 | } | |
251 | break; | |
252 | } | |
253 | ||
254 | /* Retrieve msdp packet type. */ | |
255 | stream_set_getp(s, 0); | |
256 | type = stream_getc(s); | |
257 | len = stream_getw(s); | |
258 | switch (type) { | |
259 | case PIM_MSDP_KEEPALIVE: | |
260 | mp->ka_tx_cnt++; | |
261 | break; | |
262 | case PIM_MSDP_V4_SOURCE_ACTIVE: | |
263 | mp->sa_tx_cnt++; | |
264 | break; | |
265 | default:; | |
266 | } | |
267 | if (PIM_DEBUG_MSDP_PACKETS) { | |
268 | pim_msdp_pkt_dump(mp, type, len, false /*rx*/, s); | |
269 | } | |
270 | ||
271 | /* packet sent delete it. */ | |
272 | pim_msdp_pkt_delete(mp); | |
273 | ||
274 | ++work_cnt; | |
275 | /* may need to pause if we have done too much work in this | |
276 | * loop */ | |
277 | if (work_cnt >= work_max_cnt) { | |
278 | break; | |
279 | } | |
280 | } while ((s = stream_fifo_head(mp->obuf)) != NULL); | |
281 | pim_msdp_write_proceed_actions(mp); | |
282 | ||
283 | sockopt_cork(mp->fd, 0); | |
284 | ||
285 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
286 | zlog_debug("MSDP peer %s pim_msdp_write wrote %d packets", | |
287 | mp->key_str, work_cnt); | |
288 | } | |
289 | ||
290 | return 0; | |
2a333e0f | 291 | } |
292 | ||
d62a17ae | 293 | static void pim_msdp_pkt_send(struct pim_msdp_peer *mp, struct stream *s) |
2a333e0f | 294 | { |
d62a17ae | 295 | /* Add packet to the end of list. */ |
296 | pim_msdp_pkt_add(mp, s); | |
2a333e0f | 297 | |
d62a17ae | 298 | PIM_MSDP_PEER_WRITE_ON(mp); |
2a333e0f | 299 | } |
300 | ||
d62a17ae | 301 | void pim_msdp_pkt_ka_tx(struct pim_msdp_peer *mp) |
2a333e0f | 302 | { |
d62a17ae | 303 | struct stream *s; |
2a333e0f | 304 | |
d62a17ae | 305 | if (mp->state != PIM_MSDP_ESTABLISHED) { |
306 | /* don't tx anything unless a session is established */ | |
307 | return; | |
308 | } | |
309 | s = stream_new(PIM_MSDP_KA_TLV_MAX_SIZE); | |
310 | stream_putc(s, PIM_MSDP_KEEPALIVE); | |
311 | stream_putw(s, PIM_MSDP_KA_TLV_MAX_SIZE); | |
2a333e0f | 312 | |
d62a17ae | 313 | pim_msdp_pkt_send(mp, s); |
2a333e0f | 314 | } |
315 | ||
10c899e2 DS |
316 | static void pim_msdp_pkt_sa_push_to_one_peer(struct pim_instance *pim, |
317 | struct pim_msdp_peer *mp) | |
3c72d654 | 318 | { |
d62a17ae | 319 | struct stream *s; |
320 | ||
321 | if (mp->state != PIM_MSDP_ESTABLISHED) { | |
322 | /* don't tx anything unless a session is established */ | |
323 | return; | |
324 | } | |
10c899e2 | 325 | s = stream_dup(pim->msdp.work_obuf); |
d62a17ae | 326 | if (s) { |
327 | pim_msdp_pkt_send(mp, s); | |
328 | mp->flags |= PIM_MSDP_PEERF_SA_JUST_SENT; | |
329 | } | |
3c72d654 | 330 | } |
331 | ||
332 | /* push the stream into the obuf fifo of all the peers */ | |
10c899e2 DS |
333 | static void pim_msdp_pkt_sa_push(struct pim_instance *pim, |
334 | struct pim_msdp_peer *mp) | |
3c72d654 | 335 | { |
d62a17ae | 336 | struct listnode *mpnode; |
337 | ||
338 | if (mp) { | |
10c899e2 | 339 | pim_msdp_pkt_sa_push_to_one_peer(pim, mp); |
d62a17ae | 340 | } else { |
10c899e2 | 341 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, mpnode, mp)) { |
d62a17ae | 342 | if (PIM_DEBUG_MSDP_INTERNAL) { |
343 | zlog_debug("MSDP peer %s pim_msdp_pkt_sa_push", | |
344 | mp->key_str); | |
345 | } | |
10c899e2 | 346 | pim_msdp_pkt_sa_push_to_one_peer(pim, mp); |
d62a17ae | 347 | } |
348 | } | |
3c72d654 | 349 | } |
350 | ||
472ad383 | 351 | static int pim_msdp_pkt_sa_fill_hdr(struct pim_instance *pim, int local_cnt) |
3c72d654 | 352 | { |
d62a17ae | 353 | int curr_tlv_ecnt; |
354 | ||
472ad383 | 355 | stream_reset(pim->msdp.work_obuf); |
d62a17ae | 356 | curr_tlv_ecnt = local_cnt > PIM_MSDP_SA_MAX_ENTRY_CNT |
357 | ? PIM_MSDP_SA_MAX_ENTRY_CNT | |
358 | : local_cnt; | |
359 | local_cnt -= curr_tlv_ecnt; | |
472ad383 DS |
360 | stream_putc(pim->msdp.work_obuf, PIM_MSDP_V4_SOURCE_ACTIVE); |
361 | stream_putw(pim->msdp.work_obuf, | |
2ad78035 | 362 | PIM_MSDP_SA_ENTRY_CNT2SIZE(curr_tlv_ecnt)); |
472ad383 DS |
363 | stream_putc(pim->msdp.work_obuf, curr_tlv_ecnt); |
364 | stream_put_ipv4(pim->msdp.work_obuf, pim->msdp.originator_id.s_addr); | |
d62a17ae | 365 | |
366 | return local_cnt; | |
3c72d654 | 367 | } |
368 | ||
d62a17ae | 369 | static void pim_msdp_pkt_sa_fill_one(struct pim_msdp_sa *sa) |
3c72d654 | 370 | { |
472ad383 DS |
371 | stream_put3(sa->pim->msdp.work_obuf, 0 /* reserved */); |
372 | stream_putc(sa->pim->msdp.work_obuf, 32 /* sprefix len */); | |
373 | stream_put_ipv4(sa->pim->msdp.work_obuf, sa->sg.grp.s_addr); | |
374 | stream_put_ipv4(sa->pim->msdp.work_obuf, sa->sg.src.s_addr); | |
3c72d654 | 375 | } |
376 | ||
4097373f DS |
377 | static void pim_msdp_pkt_sa_gen(struct pim_instance *pim, |
378 | struct pim_msdp_peer *mp) | |
3c72d654 | 379 | { |
d62a17ae | 380 | struct listnode *sanode; |
381 | struct pim_msdp_sa *sa; | |
382 | int sa_count; | |
4097373f | 383 | int local_cnt = pim->msdp.local_cnt; |
d62a17ae | 384 | |
385 | sa_count = 0; | |
386 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
387 | zlog_debug(" sa gen %d", local_cnt); | |
388 | } | |
389 | ||
4097373f | 390 | local_cnt = pim_msdp_pkt_sa_fill_hdr(pim, local_cnt); |
d62a17ae | 391 | |
4097373f | 392 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { |
d62a17ae | 393 | if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { |
394 | /* current implementation of MSDP is for anycast i.e. | |
395 | * full mesh. so | |
396 | * no re-forwarding of SAs that we learnt from other | |
397 | * peers */ | |
398 | continue; | |
399 | } | |
400 | /* add sa into scratch pad */ | |
401 | pim_msdp_pkt_sa_fill_one(sa); | |
402 | ++sa_count; | |
403 | if (sa_count >= PIM_MSDP_SA_MAX_ENTRY_CNT) { | |
10c899e2 | 404 | pim_msdp_pkt_sa_push(pim, mp); |
d62a17ae | 405 | /* reset headers */ |
406 | sa_count = 0; | |
407 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
408 | zlog_debug(" sa gen for remainder %d", | |
409 | local_cnt); | |
410 | } | |
4097373f | 411 | local_cnt = pim_msdp_pkt_sa_fill_hdr(pim, local_cnt); |
d62a17ae | 412 | } |
413 | } | |
414 | ||
415 | if (sa_count) { | |
10c899e2 | 416 | pim_msdp_pkt_sa_push(pim, mp); |
d62a17ae | 417 | } |
418 | return; | |
3c72d654 | 419 | } |
420 | ||
472ad383 | 421 | static void pim_msdp_pkt_sa_tx_done(struct pim_instance *pim) |
3c72d654 | 422 | { |
d62a17ae | 423 | struct listnode *mpnode; |
424 | struct pim_msdp_peer *mp; | |
425 | ||
426 | /* if SA were sent to the peers we restart ka timer and avoid | |
427 | * unnecessary ka noise */ | |
472ad383 | 428 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, mpnode, mp)) { |
d62a17ae | 429 | if (mp->flags & PIM_MSDP_PEERF_SA_JUST_SENT) { |
430 | mp->flags &= ~PIM_MSDP_PEERF_SA_JUST_SENT; | |
431 | pim_msdp_peer_pkt_txed(mp); | |
432 | } | |
433 | } | |
3c72d654 | 434 | } |
435 | ||
472ad383 | 436 | void pim_msdp_pkt_sa_tx(struct pim_instance *pim) |
3c72d654 | 437 | { |
4097373f | 438 | pim_msdp_pkt_sa_gen(pim, NULL /* mp */); |
472ad383 | 439 | pim_msdp_pkt_sa_tx_done(pim); |
3c72d654 | 440 | } |
441 | ||
d62a17ae | 442 | void pim_msdp_pkt_sa_tx_one(struct pim_msdp_sa *sa) |
3c72d654 | 443 | { |
472ad383 | 444 | pim_msdp_pkt_sa_fill_hdr(sa->pim, 1 /* cnt */); |
d62a17ae | 445 | pim_msdp_pkt_sa_fill_one(sa); |
10c899e2 | 446 | pim_msdp_pkt_sa_push(sa->pim, NULL); |
472ad383 | 447 | pim_msdp_pkt_sa_tx_done(sa->pim); |
3c72d654 | 448 | } |
449 | ||
450 | /* when a connection is first established we push all SAs immediately */ | |
d62a17ae | 451 | void pim_msdp_pkt_sa_tx_to_one_peer(struct pim_msdp_peer *mp) |
3c72d654 | 452 | { |
4097373f | 453 | pim_msdp_pkt_sa_gen(mp->pim, mp); |
472ad383 | 454 | pim_msdp_pkt_sa_tx_done(mp->pim); |
3c72d654 | 455 | } |
456 | ||
d62a17ae | 457 | static void pim_msdp_pkt_rxed_with_fatal_error(struct pim_msdp_peer *mp) |
2a333e0f | 458 | { |
d62a17ae | 459 | pim_msdp_peer_reset_tcp_conn(mp, "invalid-pkt-rx"); |
2a333e0f | 460 | } |
461 | ||
d62a17ae | 462 | static void pim_msdp_pkt_ka_rx(struct pim_msdp_peer *mp, int len) |
2a333e0f | 463 | { |
d62a17ae | 464 | mp->ka_rx_cnt++; |
465 | if (len != PIM_MSDP_KA_TLV_MAX_SIZE) { | |
466 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
467 | return; | |
468 | } | |
469 | pim_msdp_peer_pkt_rxed(mp); | |
2a333e0f | 470 | } |
471 | ||
d62a17ae | 472 | static void pim_msdp_pkt_sa_rx_one(struct pim_msdp_peer *mp, struct in_addr rp) |
3c72d654 | 473 | { |
d62a17ae | 474 | int prefix_len; |
475 | struct prefix_sg sg; | |
476 | ||
477 | /* just throw away the three reserved bytes */ | |
478 | stream_get3(mp->ibuf); | |
479 | prefix_len = stream_getc(mp->ibuf); | |
480 | ||
481 | memset(&sg, 0, sizeof(struct prefix_sg)); | |
482 | sg.grp.s_addr = stream_get_ipv4(mp->ibuf); | |
483 | sg.src.s_addr = stream_get_ipv4(mp->ibuf); | |
484 | ||
485 | if (prefix_len != 32) { | |
486 | /* ignore SA update if the prefix length is not 32 */ | |
298004a1 | 487 | flog_err(EC_PIM_MSDP_PACKET, |
1c50c1c0 QY |
488 | "rxed sa update with invalid prefix length %d", |
489 | prefix_len); | |
d62a17ae | 490 | return; |
491 | } | |
492 | if (PIM_DEBUG_MSDP_PACKETS) { | |
493 | zlog_debug(" sg %s", pim_str_sg_dump(&sg)); | |
494 | } | |
472ad383 | 495 | pim_msdp_sa_ref(mp->pim, mp, &sg, rp); |
3c72d654 | 496 | } |
497 | ||
d62a17ae | 498 | static void pim_msdp_pkt_sa_rx(struct pim_msdp_peer *mp, int len) |
2a333e0f | 499 | { |
d62a17ae | 500 | int entry_cnt; |
501 | int i; | |
502 | struct in_addr rp; /* Last RP address associated with this SA */ | |
503 | ||
504 | mp->sa_rx_cnt++; | |
505 | ||
506 | if (len < PIM_MSDP_SA_TLV_MIN_SIZE) { | |
507 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
508 | return; | |
509 | } | |
510 | ||
511 | entry_cnt = stream_getc(mp->ibuf); | |
512 | /* some vendors include the actual multicast data in the tlv (at the | |
513 | * end). | |
514 | * we will ignore such data. in the future we may consider pushing it | |
515 | * down | |
516 | * the RPT */ | |
517 | if (len < PIM_MSDP_SA_ENTRY_CNT2SIZE(entry_cnt)) { | |
518 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
519 | return; | |
520 | } | |
521 | rp.s_addr = stream_get_ipv4(mp->ibuf); | |
522 | ||
523 | if (PIM_DEBUG_MSDP_PACKETS) { | |
524 | char rp_str[INET_ADDRSTRLEN]; | |
525 | pim_inet4_dump("<rp?>", rp, rp_str, sizeof(rp_str)); | |
526 | zlog_debug(" entry_cnt %d rp %s", entry_cnt, rp_str); | |
527 | } | |
528 | ||
529 | if (!pim_msdp_peer_rpf_check(mp, rp)) { | |
530 | /* if peer-RPF check fails don't process the packet any further | |
531 | */ | |
532 | if (PIM_DEBUG_MSDP_PACKETS) { | |
533 | zlog_debug(" peer RPF check failed"); | |
534 | } | |
535 | return; | |
536 | } | |
537 | ||
538 | pim_msdp_peer_pkt_rxed(mp); | |
539 | ||
540 | /* update SA cache */ | |
541 | for (i = 0; i < entry_cnt; ++i) { | |
542 | pim_msdp_pkt_sa_rx_one(mp, rp); | |
543 | } | |
2a333e0f | 544 | } |
545 | ||
d62a17ae | 546 | static void pim_msdp_pkt_rx(struct pim_msdp_peer *mp) |
2a333e0f | 547 | { |
d62a17ae | 548 | enum pim_msdp_tlv type; |
549 | int len; | |
550 | ||
551 | /* re-read type and len */ | |
552 | type = stream_getc_from(mp->ibuf, 0); | |
553 | len = stream_getw_from(mp->ibuf, 1); | |
554 | if (len < PIM_MSDP_HEADER_SIZE) { | |
555 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
556 | return; | |
557 | } | |
558 | ||
559 | if (len > PIM_MSDP_SA_TLV_MAX_SIZE) { | |
560 | /* if tlv size if greater than max just ignore the tlv */ | |
561 | return; | |
562 | } | |
563 | ||
564 | if (PIM_DEBUG_MSDP_PACKETS) { | |
565 | pim_msdp_pkt_dump(mp, type, len, true /*rx*/, NULL /*s*/); | |
566 | } | |
567 | ||
568 | switch (type) { | |
569 | case PIM_MSDP_KEEPALIVE: | |
570 | pim_msdp_pkt_ka_rx(mp, len); | |
571 | break; | |
572 | case PIM_MSDP_V4_SOURCE_ACTIVE: | |
573 | mp->sa_rx_cnt++; | |
574 | pim_msdp_pkt_sa_rx(mp, len); | |
575 | break; | |
576 | default: | |
577 | mp->unk_rx_cnt++; | |
578 | } | |
2a333e0f | 579 | } |
580 | ||
581 | /* pim msdp read utility function. */ | |
d62a17ae | 582 | static int pim_msdp_read_packet(struct pim_msdp_peer *mp) |
2a333e0f | 583 | { |
d62a17ae | 584 | int nbytes; |
585 | int readsize; | |
586 | int old_endp; | |
587 | int new_endp; | |
588 | ||
589 | old_endp = stream_get_endp(mp->ibuf); | |
590 | readsize = mp->packet_size - old_endp; | |
591 | if (!readsize) { | |
592 | return 0; | |
593 | } | |
594 | ||
595 | /* Read packet from fd */ | |
596 | nbytes = stream_read_try(mp->ibuf, mp->fd, readsize); | |
597 | new_endp = stream_get_endp(mp->ibuf); | |
598 | if (nbytes < 0) { | |
599 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
600 | zlog_debug("MSDP peer %s read failed %d", mp->key_str, | |
601 | nbytes); | |
602 | } | |
603 | if (nbytes == -2) { | |
604 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
605 | zlog_debug( | |
606 | "MSDP peer %s pim_msdp_read io retry old_end: %d new_end: %d", | |
607 | mp->key_str, old_endp, new_endp); | |
608 | } | |
609 | /* transient error retry */ | |
610 | return -1; | |
611 | } | |
612 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
613 | return -1; | |
614 | } | |
615 | ||
616 | if (!nbytes) { | |
617 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
618 | zlog_debug("MSDP peer %s read failed %d", mp->key_str, | |
619 | nbytes); | |
620 | } | |
621 | pim_msdp_peer_reset_tcp_conn(mp, "peer-down"); | |
622 | return -1; | |
623 | } | |
624 | ||
625 | /* We read partial packet. */ | |
626 | if (stream_get_endp(mp->ibuf) != mp->packet_size) { | |
627 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
628 | zlog_debug( | |
629 | "MSDP peer %s read partial len %d old_endp %d new_endp %d", | |
630 | mp->key_str, mp->packet_size, old_endp, | |
631 | new_endp); | |
632 | } | |
633 | return -1; | |
634 | } | |
635 | ||
636 | return 0; | |
2a333e0f | 637 | } |
638 | ||
d62a17ae | 639 | int pim_msdp_read(struct thread *thread) |
2a333e0f | 640 | { |
d62a17ae | 641 | struct pim_msdp_peer *mp; |
642 | int rc; | |
643 | uint32_t len; | |
644 | ||
645 | mp = THREAD_ARG(thread); | |
646 | mp->t_read = NULL; | |
647 | ||
648 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
649 | zlog_debug("MSDP peer %s pim_msdp_read", mp->key_str); | |
650 | } | |
651 | ||
652 | if (mp->fd < 0) { | |
653 | return -1; | |
654 | } | |
655 | ||
656 | /* check if TCP connection is established */ | |
657 | if (mp->state != PIM_MSDP_ESTABLISHED) { | |
658 | pim_msdp_connect_check(mp); | |
659 | return 0; | |
660 | } | |
661 | ||
662 | PIM_MSDP_PEER_READ_ON(mp); | |
663 | ||
664 | if (!mp->packet_size) { | |
665 | mp->packet_size = PIM_MSDP_HEADER_SIZE; | |
666 | } | |
667 | ||
668 | if (stream_get_endp(mp->ibuf) < PIM_MSDP_HEADER_SIZE) { | |
669 | /* start by reading the TLV header */ | |
670 | rc = pim_msdp_read_packet(mp); | |
671 | if (rc < 0) { | |
672 | goto pim_msdp_read_end; | |
673 | } | |
674 | ||
675 | /* Find TLV type and len */ | |
676 | stream_getc(mp->ibuf); | |
677 | len = stream_getw(mp->ibuf); | |
678 | if (len < PIM_MSDP_HEADER_SIZE) { | |
679 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
680 | goto pim_msdp_read_end; | |
681 | } | |
682 | /* read complete TLV */ | |
683 | mp->packet_size = len; | |
684 | } | |
685 | ||
686 | rc = pim_msdp_read_packet(mp); | |
687 | if (rc < 0) { | |
688 | goto pim_msdp_read_end; | |
689 | } | |
690 | ||
691 | pim_msdp_pkt_rx(mp); | |
692 | ||
693 | /* reset input buffers and get ready for the next packet */ | |
694 | mp->packet_size = 0; | |
695 | stream_reset(mp->ibuf); | |
3c72d654 | 696 | |
697 | pim_msdp_read_end: | |
d62a17ae | 698 | return 0; |
2a333e0f | 699 | } |