]>
Commit | Line | Data |
---|---|---|
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" | |
993e3d8e | 29 | #include "pim_instance.h" |
2a333e0f | 30 | #include "pim_str.h" |
d9ff4302 | 31 | #include "pim_errors.h" |
2a333e0f | 32 | |
33 | #include "pim_msdp.h" | |
34 | #include "pim_msdp_packet.h" | |
35 | #include "pim_msdp_socket.h" | |
36 | ||
d62a17ae | 37 | static char *pim_msdp_pkt_type_dump(enum pim_msdp_tlv type, char *buf, |
38 | int buf_size) | |
2a333e0f | 39 | { |
d62a17ae | 40 | switch (type) { |
41 | case PIM_MSDP_V4_SOURCE_ACTIVE: | |
42 | snprintf(buf, buf_size, "%s", "SA"); | |
43 | break; | |
44 | case PIM_MSDP_V4_SOURCE_ACTIVE_REQUEST: | |
45 | snprintf(buf, buf_size, "%s", "SA_REQ"); | |
46 | break; | |
47 | case PIM_MSDP_V4_SOURCE_ACTIVE_RESPONSE: | |
48 | snprintf(buf, buf_size, "%s", "SA_RESP"); | |
49 | break; | |
50 | case PIM_MSDP_KEEPALIVE: | |
51 | snprintf(buf, buf_size, "%s", "KA"); | |
52 | break; | |
53 | case PIM_MSDP_RESERVED: | |
54 | snprintf(buf, buf_size, "%s", "RSVD"); | |
55 | break; | |
56 | case PIM_MSDP_TRACEROUTE_PROGRESS: | |
57 | snprintf(buf, buf_size, "%s", "TRACE_PROG"); | |
58 | break; | |
59 | case PIM_MSDP_TRACEROUTE_REPLY: | |
60 | snprintf(buf, buf_size, "%s", "TRACE_REPLY"); | |
61 | break; | |
62 | default: | |
63 | snprintf(buf, buf_size, "UNK-%d", type); | |
64 | } | |
65 | return buf; | |
2a333e0f | 66 | } |
67 | ||
d62a17ae | 68 | static void pim_msdp_pkt_sa_dump_one(struct stream *s) |
15ad0c71 | 69 | { |
6fff2cc6 | 70 | pim_sgaddr sg; |
15ad0c71 | 71 | |
d62a17ae | 72 | /* just throw away the three reserved bytes */ |
73 | stream_get3(s); | |
74 | /* throw away the prefix length also */ | |
75 | stream_getc(s); | |
15ad0c71 | 76 | |
6fff2cc6 | 77 | memset(&sg, 0, sizeof(sg)); |
d62a17ae | 78 | sg.grp.s_addr = stream_get_ipv4(s); |
79 | sg.src.s_addr = stream_get_ipv4(s); | |
15ad0c71 | 80 | |
98a81d2b | 81 | zlog_debug(" sg %pSG", &sg); |
15ad0c71 | 82 | } |
83 | ||
d62a17ae | 84 | static void pim_msdp_pkt_sa_dump(struct stream *s) |
15ad0c71 | 85 | { |
d62a17ae | 86 | int entry_cnt; |
87 | int i; | |
88 | struct in_addr rp; /* Last RP address associated with this SA */ | |
89 | ||
90 | entry_cnt = stream_getc(s); | |
91 | rp.s_addr = stream_get_ipv4(s); | |
92 | ||
93 | if (PIM_DEBUG_MSDP_PACKETS) { | |
94 | char rp_str[INET_ADDRSTRLEN]; | |
95 | pim_inet4_dump("<rp?>", rp, rp_str, sizeof(rp_str)); | |
96 | zlog_debug(" entry_cnt %d rp %s", entry_cnt, rp_str); | |
97 | } | |
98 | ||
99 | /* dump SAs */ | |
100 | for (i = 0; i < entry_cnt; ++i) { | |
101 | pim_msdp_pkt_sa_dump_one(s); | |
102 | } | |
15ad0c71 | 103 | } |
104 | ||
d62a17ae | 105 | static void pim_msdp_pkt_dump(struct pim_msdp_peer *mp, int type, int len, |
106 | bool rx, struct stream *s) | |
2a333e0f | 107 | { |
d62a17ae | 108 | char type_str[PIM_MSDP_PKT_TYPE_STRLEN]; |
2a333e0f | 109 | |
d62a17ae | 110 | pim_msdp_pkt_type_dump(type, type_str, sizeof(type_str)); |
2a333e0f | 111 | |
d62a17ae | 112 | zlog_debug("MSDP peer %s pkt %s type %s len %d", mp->key_str, |
113 | rx ? "rx" : "tx", type_str, len); | |
15ad0c71 | 114 | |
d62a17ae | 115 | if (!s) { |
116 | return; | |
117 | } | |
15ad0c71 | 118 | |
d62a17ae | 119 | switch (type) { |
120 | case PIM_MSDP_V4_SOURCE_ACTIVE: | |
121 | pim_msdp_pkt_sa_dump(s); | |
122 | break; | |
123 | default:; | |
124 | } | |
2a333e0f | 125 | } |
126 | ||
127 | /* Check file descriptor whether connect is established. */ | |
d62a17ae | 128 | static void pim_msdp_connect_check(struct pim_msdp_peer *mp) |
2a333e0f | 129 | { |
d62a17ae | 130 | int status; |
131 | socklen_t slen; | |
132 | int ret; | |
133 | ||
134 | if (mp->state != PIM_MSDP_CONNECTING) { | |
135 | /* if we are here it means we are not in a connecting or | |
136 | * established state | |
137 | * for now treat this as a fatal error */ | |
138 | pim_msdp_peer_reset_tcp_conn(mp, "invalid-state"); | |
139 | return; | |
140 | } | |
141 | ||
142 | PIM_MSDP_PEER_READ_OFF(mp); | |
143 | PIM_MSDP_PEER_WRITE_OFF(mp); | |
144 | ||
145 | /* Check file descriptor. */ | |
146 | slen = sizeof(status); | |
147 | ret = getsockopt(mp->fd, SOL_SOCKET, SO_ERROR, (void *)&status, &slen); | |
148 | ||
149 | /* If getsockopt is fail, this is fatal error. */ | |
150 | if (ret < 0) { | |
450971aa | 151 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 | 152 | "can't get sockopt for nonblocking connect"); |
d62a17ae | 153 | pim_msdp_peer_reset_tcp_conn(mp, "connect-failed"); |
154 | return; | |
155 | } | |
156 | ||
157 | /* When status is 0 then TCP connection is established. */ | |
158 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
159 | zlog_debug("MSDP peer %s pim_connect_check %s", mp->key_str, | |
160 | status ? "fail" : "success"); | |
161 | } | |
162 | if (status == 0) { | |
163 | pim_msdp_peer_established(mp); | |
164 | } else { | |
165 | pim_msdp_peer_reset_tcp_conn(mp, "connect-failed"); | |
166 | } | |
2a333e0f | 167 | } |
168 | ||
d62a17ae | 169 | static void pim_msdp_pkt_delete(struct pim_msdp_peer *mp) |
2a333e0f | 170 | { |
d62a17ae | 171 | stream_free(stream_fifo_pop(mp->obuf)); |
2a333e0f | 172 | } |
173 | ||
d62a17ae | 174 | static void pim_msdp_pkt_add(struct pim_msdp_peer *mp, struct stream *s) |
3c72d654 | 175 | { |
d62a17ae | 176 | stream_fifo_push(mp->obuf, s); |
3c72d654 | 177 | } |
178 | ||
d62a17ae | 179 | static void pim_msdp_write_proceed_actions(struct pim_msdp_peer *mp) |
2a333e0f | 180 | { |
d62a17ae | 181 | if (stream_fifo_head(mp->obuf)) { |
182 | PIM_MSDP_PEER_WRITE_ON(mp); | |
183 | } | |
2a333e0f | 184 | } |
185 | ||
cc9f21da | 186 | void pim_msdp_write(struct thread *thread) |
2a333e0f | 187 | { |
d62a17ae | 188 | struct pim_msdp_peer *mp; |
189 | struct stream *s; | |
190 | int num; | |
191 | enum pim_msdp_tlv type; | |
192 | int len; | |
193 | int work_cnt = 0; | |
194 | int work_max_cnt = 100; | |
195 | ||
196 | mp = THREAD_ARG(thread); | |
197 | mp->t_write = NULL; | |
198 | ||
199 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
200 | zlog_debug("MSDP peer %s pim_msdp_write", mp->key_str); | |
201 | } | |
202 | if (mp->fd < 0) { | |
cc9f21da | 203 | return; |
d62a17ae | 204 | } |
205 | ||
206 | /* check if TCP connection is established */ | |
207 | if (mp->state != PIM_MSDP_ESTABLISHED) { | |
208 | pim_msdp_connect_check(mp); | |
cc9f21da | 209 | return; |
d62a17ae | 210 | } |
211 | ||
212 | s = stream_fifo_head(mp->obuf); | |
213 | if (!s) { | |
214 | pim_msdp_write_proceed_actions(mp); | |
cc9f21da | 215 | return; |
d62a17ae | 216 | } |
217 | ||
d62a17ae | 218 | /* Nonblocking write until TCP output buffer is full */ |
219 | do { | |
220 | int writenum; | |
221 | ||
222 | /* Number of bytes to be sent */ | |
223 | writenum = stream_get_endp(s) - stream_get_getp(s); | |
224 | ||
225 | /* Call write() system call */ | |
2d34fb80 | 226 | num = write(mp->fd, stream_pnt(s), writenum); |
d62a17ae | 227 | if (num < 0) { |
228 | /* write failed either retry needed or error */ | |
229 | if (ERRNO_IO_RETRY(errno)) { | |
230 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
231 | zlog_debug( | |
232 | "MSDP peer %s pim_msdp_write io retry", | |
233 | mp->key_str); | |
234 | } | |
235 | break; | |
236 | } | |
237 | ||
238 | pim_msdp_peer_reset_tcp_conn(mp, "pkt-tx-failed"); | |
cc9f21da | 239 | return; |
d62a17ae | 240 | } |
241 | ||
242 | if (num != writenum) { | |
243 | /* Partial write */ | |
244 | stream_forward_getp(s, num); | |
245 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
246 | zlog_debug( | |
247 | "MSDP peer %s pim_msdp_partial_write", | |
248 | mp->key_str); | |
249 | } | |
250 | break; | |
251 | } | |
252 | ||
253 | /* Retrieve msdp packet type. */ | |
254 | stream_set_getp(s, 0); | |
255 | type = stream_getc(s); | |
256 | len = stream_getw(s); | |
257 | switch (type) { | |
258 | case PIM_MSDP_KEEPALIVE: | |
259 | mp->ka_tx_cnt++; | |
260 | break; | |
261 | case PIM_MSDP_V4_SOURCE_ACTIVE: | |
262 | mp->sa_tx_cnt++; | |
263 | break; | |
264 | default:; | |
265 | } | |
266 | if (PIM_DEBUG_MSDP_PACKETS) { | |
267 | pim_msdp_pkt_dump(mp, type, len, false /*rx*/, s); | |
268 | } | |
269 | ||
270 | /* packet sent delete it. */ | |
271 | pim_msdp_pkt_delete(mp); | |
272 | ||
273 | ++work_cnt; | |
274 | /* may need to pause if we have done too much work in this | |
275 | * loop */ | |
276 | if (work_cnt >= work_max_cnt) { | |
277 | break; | |
278 | } | |
279 | } while ((s = stream_fifo_head(mp->obuf)) != NULL); | |
280 | pim_msdp_write_proceed_actions(mp); | |
281 | ||
d62a17ae | 282 | if (PIM_DEBUG_MSDP_INTERNAL) { |
283 | zlog_debug("MSDP peer %s pim_msdp_write wrote %d packets", | |
284 | mp->key_str, work_cnt); | |
285 | } | |
2a333e0f | 286 | } |
287 | ||
d62a17ae | 288 | static void pim_msdp_pkt_send(struct pim_msdp_peer *mp, struct stream *s) |
2a333e0f | 289 | { |
d62a17ae | 290 | /* Add packet to the end of list. */ |
291 | pim_msdp_pkt_add(mp, s); | |
2a333e0f | 292 | |
d62a17ae | 293 | PIM_MSDP_PEER_WRITE_ON(mp); |
2a333e0f | 294 | } |
295 | ||
d62a17ae | 296 | void pim_msdp_pkt_ka_tx(struct pim_msdp_peer *mp) |
2a333e0f | 297 | { |
d62a17ae | 298 | struct stream *s; |
2a333e0f | 299 | |
d62a17ae | 300 | if (mp->state != PIM_MSDP_ESTABLISHED) { |
301 | /* don't tx anything unless a session is established */ | |
302 | return; | |
303 | } | |
304 | s = stream_new(PIM_MSDP_KA_TLV_MAX_SIZE); | |
305 | stream_putc(s, PIM_MSDP_KEEPALIVE); | |
306 | stream_putw(s, PIM_MSDP_KA_TLV_MAX_SIZE); | |
2a333e0f | 307 | |
d62a17ae | 308 | pim_msdp_pkt_send(mp, s); |
2a333e0f | 309 | } |
310 | ||
10c899e2 DS |
311 | static void pim_msdp_pkt_sa_push_to_one_peer(struct pim_instance *pim, |
312 | struct pim_msdp_peer *mp) | |
3c72d654 | 313 | { |
d62a17ae | 314 | struct stream *s; |
315 | ||
316 | if (mp->state != PIM_MSDP_ESTABLISHED) { | |
317 | /* don't tx anything unless a session is established */ | |
318 | return; | |
319 | } | |
10c899e2 | 320 | s = stream_dup(pim->msdp.work_obuf); |
d62a17ae | 321 | if (s) { |
322 | pim_msdp_pkt_send(mp, s); | |
323 | mp->flags |= PIM_MSDP_PEERF_SA_JUST_SENT; | |
324 | } | |
3c72d654 | 325 | } |
326 | ||
327 | /* push the stream into the obuf fifo of all the peers */ | |
10c899e2 DS |
328 | static void pim_msdp_pkt_sa_push(struct pim_instance *pim, |
329 | struct pim_msdp_peer *mp) | |
3c72d654 | 330 | { |
d62a17ae | 331 | struct listnode *mpnode; |
332 | ||
333 | if (mp) { | |
10c899e2 | 334 | pim_msdp_pkt_sa_push_to_one_peer(pim, mp); |
d62a17ae | 335 | } else { |
10c899e2 | 336 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, mpnode, mp)) { |
d62a17ae | 337 | if (PIM_DEBUG_MSDP_INTERNAL) { |
338 | zlog_debug("MSDP peer %s pim_msdp_pkt_sa_push", | |
339 | mp->key_str); | |
340 | } | |
10c899e2 | 341 | pim_msdp_pkt_sa_push_to_one_peer(pim, mp); |
d62a17ae | 342 | } |
343 | } | |
3c72d654 | 344 | } |
345 | ||
9fbd9fc4 AMR |
346 | static int pim_msdp_pkt_sa_fill_hdr(struct pim_instance *pim, int local_cnt, |
347 | struct in_addr rp) | |
3c72d654 | 348 | { |
d62a17ae | 349 | int curr_tlv_ecnt; |
350 | ||
472ad383 | 351 | stream_reset(pim->msdp.work_obuf); |
d62a17ae | 352 | curr_tlv_ecnt = local_cnt > PIM_MSDP_SA_MAX_ENTRY_CNT |
353 | ? PIM_MSDP_SA_MAX_ENTRY_CNT | |
354 | : local_cnt; | |
355 | local_cnt -= curr_tlv_ecnt; | |
472ad383 DS |
356 | stream_putc(pim->msdp.work_obuf, PIM_MSDP_V4_SOURCE_ACTIVE); |
357 | stream_putw(pim->msdp.work_obuf, | |
2ad78035 | 358 | PIM_MSDP_SA_ENTRY_CNT2SIZE(curr_tlv_ecnt)); |
472ad383 | 359 | stream_putc(pim->msdp.work_obuf, curr_tlv_ecnt); |
9fbd9fc4 | 360 | stream_put_ipv4(pim->msdp.work_obuf, rp.s_addr); |
d62a17ae | 361 | |
362 | return local_cnt; | |
3c72d654 | 363 | } |
364 | ||
d62a17ae | 365 | static void pim_msdp_pkt_sa_fill_one(struct pim_msdp_sa *sa) |
3c72d654 | 366 | { |
472ad383 DS |
367 | stream_put3(sa->pim->msdp.work_obuf, 0 /* reserved */); |
368 | stream_putc(sa->pim->msdp.work_obuf, 32 /* sprefix len */); | |
369 | stream_put_ipv4(sa->pim->msdp.work_obuf, sa->sg.grp.s_addr); | |
370 | stream_put_ipv4(sa->pim->msdp.work_obuf, sa->sg.src.s_addr); | |
3c72d654 | 371 | } |
372 | ||
4097373f DS |
373 | static void pim_msdp_pkt_sa_gen(struct pim_instance *pim, |
374 | struct pim_msdp_peer *mp) | |
3c72d654 | 375 | { |
d62a17ae | 376 | struct listnode *sanode; |
377 | struct pim_msdp_sa *sa; | |
378 | int sa_count; | |
4097373f | 379 | int local_cnt = pim->msdp.local_cnt; |
d62a17ae | 380 | |
381 | sa_count = 0; | |
382 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
383 | zlog_debug(" sa gen %d", local_cnt); | |
384 | } | |
385 | ||
9fbd9fc4 AMR |
386 | local_cnt = pim_msdp_pkt_sa_fill_hdr(pim, local_cnt, |
387 | pim->msdp.originator_id); | |
d62a17ae | 388 | |
4097373f | 389 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { |
d62a17ae | 390 | if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { |
391 | /* current implementation of MSDP is for anycast i.e. | |
392 | * full mesh. so | |
393 | * no re-forwarding of SAs that we learnt from other | |
394 | * peers */ | |
395 | continue; | |
396 | } | |
397 | /* add sa into scratch pad */ | |
398 | pim_msdp_pkt_sa_fill_one(sa); | |
399 | ++sa_count; | |
400 | if (sa_count >= PIM_MSDP_SA_MAX_ENTRY_CNT) { | |
10c899e2 | 401 | pim_msdp_pkt_sa_push(pim, mp); |
d62a17ae | 402 | /* reset headers */ |
403 | sa_count = 0; | |
404 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
405 | zlog_debug(" sa gen for remainder %d", | |
406 | local_cnt); | |
407 | } | |
9fbd9fc4 AMR |
408 | local_cnt = pim_msdp_pkt_sa_fill_hdr( |
409 | pim, local_cnt, pim->msdp.originator_id); | |
d62a17ae | 410 | } |
411 | } | |
412 | ||
413 | if (sa_count) { | |
10c899e2 | 414 | pim_msdp_pkt_sa_push(pim, mp); |
d62a17ae | 415 | } |
416 | return; | |
3c72d654 | 417 | } |
418 | ||
472ad383 | 419 | static void pim_msdp_pkt_sa_tx_done(struct pim_instance *pim) |
3c72d654 | 420 | { |
d62a17ae | 421 | struct listnode *mpnode; |
422 | struct pim_msdp_peer *mp; | |
423 | ||
424 | /* if SA were sent to the peers we restart ka timer and avoid | |
425 | * unnecessary ka noise */ | |
472ad383 | 426 | for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, mpnode, mp)) { |
d62a17ae | 427 | if (mp->flags & PIM_MSDP_PEERF_SA_JUST_SENT) { |
428 | mp->flags &= ~PIM_MSDP_PEERF_SA_JUST_SENT; | |
429 | pim_msdp_peer_pkt_txed(mp); | |
430 | } | |
431 | } | |
3c72d654 | 432 | } |
433 | ||
472ad383 | 434 | void pim_msdp_pkt_sa_tx(struct pim_instance *pim) |
3c72d654 | 435 | { |
4097373f | 436 | pim_msdp_pkt_sa_gen(pim, NULL /* mp */); |
472ad383 | 437 | pim_msdp_pkt_sa_tx_done(pim); |
3c72d654 | 438 | } |
439 | ||
d62a17ae | 440 | void pim_msdp_pkt_sa_tx_one(struct pim_msdp_sa *sa) |
3c72d654 | 441 | { |
9fbd9fc4 | 442 | pim_msdp_pkt_sa_fill_hdr(sa->pim, 1 /* cnt */, sa->rp); |
d62a17ae | 443 | pim_msdp_pkt_sa_fill_one(sa); |
10c899e2 | 444 | pim_msdp_pkt_sa_push(sa->pim, NULL); |
472ad383 | 445 | pim_msdp_pkt_sa_tx_done(sa->pim); |
3c72d654 | 446 | } |
447 | ||
448 | /* when a connection is first established we push all SAs immediately */ | |
d62a17ae | 449 | void pim_msdp_pkt_sa_tx_to_one_peer(struct pim_msdp_peer *mp) |
3c72d654 | 450 | { |
4097373f | 451 | pim_msdp_pkt_sa_gen(mp->pim, mp); |
472ad383 | 452 | pim_msdp_pkt_sa_tx_done(mp->pim); |
3c72d654 | 453 | } |
454 | ||
9fbd9fc4 | 455 | void pim_msdp_pkt_sa_tx_one_to_one_peer(struct pim_msdp_peer *mp, |
6fff2cc6 | 456 | struct in_addr rp, pim_sgaddr sg) |
9fbd9fc4 AMR |
457 | { |
458 | struct pim_msdp_sa sa; | |
459 | ||
460 | /* Fills the SA header. */ | |
461 | pim_msdp_pkt_sa_fill_hdr(mp->pim, 1, rp); | |
462 | ||
463 | /* Fills the message contents. */ | |
464 | sa.pim = mp->pim; | |
465 | sa.sg = sg; | |
466 | pim_msdp_pkt_sa_fill_one(&sa); | |
467 | ||
468 | /* Pushes the message. */ | |
469 | pim_msdp_pkt_sa_push(sa.pim, mp); | |
470 | pim_msdp_pkt_sa_tx_done(sa.pim); | |
471 | } | |
472 | ||
d62a17ae | 473 | static void pim_msdp_pkt_rxed_with_fatal_error(struct pim_msdp_peer *mp) |
2a333e0f | 474 | { |
d62a17ae | 475 | pim_msdp_peer_reset_tcp_conn(mp, "invalid-pkt-rx"); |
2a333e0f | 476 | } |
477 | ||
d62a17ae | 478 | static void pim_msdp_pkt_ka_rx(struct pim_msdp_peer *mp, int len) |
2a333e0f | 479 | { |
d62a17ae | 480 | mp->ka_rx_cnt++; |
481 | if (len != PIM_MSDP_KA_TLV_MAX_SIZE) { | |
482 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
483 | return; | |
484 | } | |
485 | pim_msdp_peer_pkt_rxed(mp); | |
2a333e0f | 486 | } |
487 | ||
d62a17ae | 488 | static void pim_msdp_pkt_sa_rx_one(struct pim_msdp_peer *mp, struct in_addr rp) |
3c72d654 | 489 | { |
d62a17ae | 490 | int prefix_len; |
6fff2cc6 | 491 | pim_sgaddr sg; |
9fbd9fc4 AMR |
492 | struct listnode *peer_node; |
493 | struct pim_msdp_peer *peer; | |
d62a17ae | 494 | |
495 | /* just throw away the three reserved bytes */ | |
496 | stream_get3(mp->ibuf); | |
497 | prefix_len = stream_getc(mp->ibuf); | |
498 | ||
6fff2cc6 | 499 | memset(&sg, 0, sizeof(sg)); |
d62a17ae | 500 | sg.grp.s_addr = stream_get_ipv4(mp->ibuf); |
501 | sg.src.s_addr = stream_get_ipv4(mp->ibuf); | |
502 | ||
12256b84 | 503 | if (prefix_len != IPV4_MAX_BITLEN) { |
d62a17ae | 504 | /* ignore SA update if the prefix length is not 32 */ |
298004a1 | 505 | flog_err(EC_PIM_MSDP_PACKET, |
1c50c1c0 QY |
506 | "rxed sa update with invalid prefix length %d", |
507 | prefix_len); | |
d62a17ae | 508 | return; |
509 | } | |
510 | if (PIM_DEBUG_MSDP_PACKETS) { | |
98a81d2b | 511 | zlog_debug(" sg %pSG", &sg); |
d62a17ae | 512 | } |
472ad383 | 513 | pim_msdp_sa_ref(mp->pim, mp, &sg, rp); |
9fbd9fc4 AMR |
514 | |
515 | /* Forwards the SA to the peers that are not in the RPF to the RP nor in | |
516 | * the same mesh group as the peer from which we received the message. | |
517 | * If the message group is not set, i.e. "default", then we assume that | |
518 | * the message must be forwarded.*/ | |
519 | for (ALL_LIST_ELEMENTS_RO(mp->pim->msdp.peer_list, peer_node, peer)) { | |
0ce04a08 RZ |
520 | /* Not a RPF peer, so skip it. */ |
521 | if (pim_msdp_peer_rpf_check(peer, rp)) | |
522 | continue; | |
523 | /* Don't forward inside the meshed group. */ | |
524 | if ((mp->flags & PIM_MSDP_PEERF_IN_GROUP) | |
525 | && strcmp(mp->mesh_group_name, peer->mesh_group_name) == 0) | |
526 | continue; | |
527 | ||
528 | pim_msdp_pkt_sa_tx_one_to_one_peer(peer, rp, sg); | |
9fbd9fc4 | 529 | } |
3c72d654 | 530 | } |
531 | ||
d62a17ae | 532 | static void pim_msdp_pkt_sa_rx(struct pim_msdp_peer *mp, int len) |
2a333e0f | 533 | { |
d62a17ae | 534 | int entry_cnt; |
535 | int i; | |
536 | struct in_addr rp; /* Last RP address associated with this SA */ | |
537 | ||
538 | mp->sa_rx_cnt++; | |
539 | ||
540 | if (len < PIM_MSDP_SA_TLV_MIN_SIZE) { | |
541 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
542 | return; | |
543 | } | |
544 | ||
545 | entry_cnt = stream_getc(mp->ibuf); | |
546 | /* some vendors include the actual multicast data in the tlv (at the | |
9fbd9fc4 AMR |
547 | * end). we will ignore such data. in the future we may consider pushing |
548 | * it down the RPT | |
549 | */ | |
d62a17ae | 550 | if (len < PIM_MSDP_SA_ENTRY_CNT2SIZE(entry_cnt)) { |
551 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
552 | return; | |
553 | } | |
554 | rp.s_addr = stream_get_ipv4(mp->ibuf); | |
555 | ||
556 | if (PIM_DEBUG_MSDP_PACKETS) { | |
557 | char rp_str[INET_ADDRSTRLEN]; | |
558 | pim_inet4_dump("<rp?>", rp, rp_str, sizeof(rp_str)); | |
559 | zlog_debug(" entry_cnt %d rp %s", entry_cnt, rp_str); | |
560 | } | |
561 | ||
9fbd9fc4 AMR |
562 | pim_msdp_peer_pkt_rxed(mp); |
563 | ||
d62a17ae | 564 | if (!pim_msdp_peer_rpf_check(mp, rp)) { |
565 | /* if peer-RPF check fails don't process the packet any further | |
566 | */ | |
567 | if (PIM_DEBUG_MSDP_PACKETS) { | |
568 | zlog_debug(" peer RPF check failed"); | |
569 | } | |
570 | return; | |
571 | } | |
572 | ||
d62a17ae | 573 | /* update SA cache */ |
574 | for (i = 0; i < entry_cnt; ++i) { | |
575 | pim_msdp_pkt_sa_rx_one(mp, rp); | |
576 | } | |
2a333e0f | 577 | } |
578 | ||
d62a17ae | 579 | static void pim_msdp_pkt_rx(struct pim_msdp_peer *mp) |
2a333e0f | 580 | { |
d62a17ae | 581 | enum pim_msdp_tlv type; |
582 | int len; | |
583 | ||
584 | /* re-read type and len */ | |
585 | type = stream_getc_from(mp->ibuf, 0); | |
586 | len = stream_getw_from(mp->ibuf, 1); | |
587 | if (len < PIM_MSDP_HEADER_SIZE) { | |
588 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
589 | return; | |
590 | } | |
591 | ||
592 | if (len > PIM_MSDP_SA_TLV_MAX_SIZE) { | |
593 | /* if tlv size if greater than max just ignore the tlv */ | |
594 | return; | |
595 | } | |
596 | ||
597 | if (PIM_DEBUG_MSDP_PACKETS) { | |
598 | pim_msdp_pkt_dump(mp, type, len, true /*rx*/, NULL /*s*/); | |
599 | } | |
600 | ||
601 | switch (type) { | |
602 | case PIM_MSDP_KEEPALIVE: | |
603 | pim_msdp_pkt_ka_rx(mp, len); | |
604 | break; | |
605 | case PIM_MSDP_V4_SOURCE_ACTIVE: | |
606 | mp->sa_rx_cnt++; | |
607 | pim_msdp_pkt_sa_rx(mp, len); | |
608 | break; | |
609 | default: | |
610 | mp->unk_rx_cnt++; | |
611 | } | |
2a333e0f | 612 | } |
613 | ||
614 | /* pim msdp read utility function. */ | |
d62a17ae | 615 | static int pim_msdp_read_packet(struct pim_msdp_peer *mp) |
2a333e0f | 616 | { |
d62a17ae | 617 | int nbytes; |
618 | int readsize; | |
619 | int old_endp; | |
620 | int new_endp; | |
621 | ||
622 | old_endp = stream_get_endp(mp->ibuf); | |
623 | readsize = mp->packet_size - old_endp; | |
624 | if (!readsize) { | |
625 | return 0; | |
626 | } | |
627 | ||
628 | /* Read packet from fd */ | |
629 | nbytes = stream_read_try(mp->ibuf, mp->fd, readsize); | |
630 | new_endp = stream_get_endp(mp->ibuf); | |
631 | if (nbytes < 0) { | |
632 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
633 | zlog_debug("MSDP peer %s read failed %d", mp->key_str, | |
634 | nbytes); | |
635 | } | |
636 | if (nbytes == -2) { | |
637 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
638 | zlog_debug( | |
639 | "MSDP peer %s pim_msdp_read io retry old_end: %d new_end: %d", | |
640 | mp->key_str, old_endp, new_endp); | |
641 | } | |
642 | /* transient error retry */ | |
643 | return -1; | |
644 | } | |
645 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
646 | return -1; | |
647 | } | |
648 | ||
649 | if (!nbytes) { | |
650 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
651 | zlog_debug("MSDP peer %s read failed %d", mp->key_str, | |
652 | nbytes); | |
653 | } | |
654 | pim_msdp_peer_reset_tcp_conn(mp, "peer-down"); | |
655 | return -1; | |
656 | } | |
657 | ||
658 | /* We read partial packet. */ | |
659 | if (stream_get_endp(mp->ibuf) != mp->packet_size) { | |
660 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
661 | zlog_debug( | |
662 | "MSDP peer %s read partial len %d old_endp %d new_endp %d", | |
663 | mp->key_str, mp->packet_size, old_endp, | |
664 | new_endp); | |
665 | } | |
666 | return -1; | |
667 | } | |
668 | ||
669 | return 0; | |
2a333e0f | 670 | } |
671 | ||
cc9f21da | 672 | void pim_msdp_read(struct thread *thread) |
2a333e0f | 673 | { |
d62a17ae | 674 | struct pim_msdp_peer *mp; |
675 | int rc; | |
676 | uint32_t len; | |
677 | ||
678 | mp = THREAD_ARG(thread); | |
679 | mp->t_read = NULL; | |
680 | ||
681 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
682 | zlog_debug("MSDP peer %s pim_msdp_read", mp->key_str); | |
683 | } | |
684 | ||
685 | if (mp->fd < 0) { | |
cc9f21da | 686 | return; |
d62a17ae | 687 | } |
688 | ||
689 | /* check if TCP connection is established */ | |
690 | if (mp->state != PIM_MSDP_ESTABLISHED) { | |
691 | pim_msdp_connect_check(mp); | |
cc9f21da | 692 | return; |
d62a17ae | 693 | } |
694 | ||
695 | PIM_MSDP_PEER_READ_ON(mp); | |
696 | ||
697 | if (!mp->packet_size) { | |
698 | mp->packet_size = PIM_MSDP_HEADER_SIZE; | |
699 | } | |
700 | ||
701 | if (stream_get_endp(mp->ibuf) < PIM_MSDP_HEADER_SIZE) { | |
702 | /* start by reading the TLV header */ | |
703 | rc = pim_msdp_read_packet(mp); | |
cc9f21da DS |
704 | if (rc < 0) |
705 | return; | |
d62a17ae | 706 | |
707 | /* Find TLV type and len */ | |
708 | stream_getc(mp->ibuf); | |
709 | len = stream_getw(mp->ibuf); | |
710 | if (len < PIM_MSDP_HEADER_SIZE) { | |
711 | pim_msdp_pkt_rxed_with_fatal_error(mp); | |
cc9f21da | 712 | return; |
d62a17ae | 713 | } |
714 | /* read complete TLV */ | |
715 | mp->packet_size = len; | |
716 | } | |
717 | ||
718 | rc = pim_msdp_read_packet(mp); | |
cc9f21da DS |
719 | if (rc < 0) |
720 | return; | |
d62a17ae | 721 | |
722 | pim_msdp_pkt_rx(mp); | |
723 | ||
724 | /* reset input buffers and get ready for the next packet */ | |
725 | mp->packet_size = 0; | |
726 | stream_reset(mp->ibuf); | |
2a333e0f | 727 | } |