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1 | /* | |
2 | * PIM for Quagga | |
3 | * Copyright (C) 2008 Everton da Silva Marques | |
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 | * | |
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 | |
18 | */ | |
19 | ||
20 | #include <zebra.h> | |
21 | ||
22 | #include "log.h" | |
23 | #include "thread.h" | |
24 | #include "memory.h" | |
25 | #include "if.h" | |
26 | #include "network.h" | |
27 | ||
28 | #include "pimd.h" | |
29 | #include "pim_instance.h" | |
30 | #include "pim_pim.h" | |
31 | #include "pim_time.h" | |
32 | #include "pim_iface.h" | |
33 | #include "pim_sock.h" | |
34 | #include "pim_str.h" | |
35 | #include "pim_util.h" | |
36 | #include "pim_tlv.h" | |
37 | #include "pim_neighbor.h" | |
38 | #include "pim_hello.h" | |
39 | #include "pim_join.h" | |
40 | #include "pim_assert.h" | |
41 | #include "pim_msg.h" | |
42 | #include "pim_register.h" | |
43 | #include "pim_errors.h" | |
44 | #include "pim_bsm.h" | |
45 | #include <lib/lib_errors.h> | |
46 | ||
47 | static void on_pim_hello_send(struct thread *t); | |
48 | ||
49 | static const char *pim_pim_msgtype2str(enum pim_msg_type type) | |
50 | { | |
51 | switch (type) { | |
52 | case PIM_MSG_TYPE_HELLO: | |
53 | return "HELLO"; | |
54 | case PIM_MSG_TYPE_REGISTER: | |
55 | return "REGISTER"; | |
56 | case PIM_MSG_TYPE_REG_STOP: | |
57 | return "REGSTOP"; | |
58 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
59 | return "JOINPRUNE"; | |
60 | case PIM_MSG_TYPE_BOOTSTRAP: | |
61 | return "BOOT"; | |
62 | case PIM_MSG_TYPE_ASSERT: | |
63 | return "ASSERT"; | |
64 | case PIM_MSG_TYPE_GRAFT: | |
65 | return "GRAFT"; | |
66 | case PIM_MSG_TYPE_GRAFT_ACK: | |
67 | return "GACK"; | |
68 | case PIM_MSG_TYPE_CANDIDATE: | |
69 | return "CANDIDATE"; | |
70 | } | |
71 | ||
72 | return "UNKNOWN"; | |
73 | } | |
74 | ||
75 | static void sock_close(struct interface *ifp) | |
76 | { | |
77 | struct pim_interface *pim_ifp = ifp->info; | |
78 | ||
79 | if (PIM_DEBUG_PIM_TRACE) { | |
80 | if (pim_ifp->t_pim_sock_read) { | |
81 | zlog_debug( | |
82 | "Cancelling READ event for PIM socket fd=%d on interface %s", | |
83 | pim_ifp->pim_sock_fd, ifp->name); | |
84 | } | |
85 | } | |
86 | THREAD_OFF(pim_ifp->t_pim_sock_read); | |
87 | ||
88 | if (PIM_DEBUG_PIM_TRACE) { | |
89 | if (pim_ifp->t_pim_hello_timer) { | |
90 | zlog_debug( | |
91 | "Cancelling PIM hello timer for interface %s", | |
92 | ifp->name); | |
93 | } | |
94 | } | |
95 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
96 | ||
97 | if (PIM_DEBUG_PIM_TRACE) { | |
98 | zlog_debug("Deleting PIM socket fd=%d on interface %s", | |
99 | pim_ifp->pim_sock_fd, ifp->name); | |
100 | } | |
101 | ||
102 | /* | |
103 | * If the fd is already deleted no need to do anything here | |
104 | */ | |
105 | if (pim_ifp->pim_sock_fd > 0 && close(pim_ifp->pim_sock_fd)) { | |
106 | zlog_warn( | |
107 | "Failure closing PIM socket fd=%d on interface %s: errno=%d: %s", | |
108 | pim_ifp->pim_sock_fd, ifp->name, errno, | |
109 | safe_strerror(errno)); | |
110 | } | |
111 | ||
112 | pim_ifp->pim_sock_fd = -1; | |
113 | pim_ifp->pim_sock_creation = 0; | |
114 | } | |
115 | ||
116 | void pim_sock_delete(struct interface *ifp, const char *delete_message) | |
117 | { | |
118 | zlog_info("PIM INTERFACE DOWN: on interface %s: %s", ifp->name, | |
119 | delete_message); | |
120 | ||
121 | if (!ifp->info) { | |
122 | flog_err(EC_PIM_CONFIG, | |
123 | "%s: %s: but PIM not enabled on interface %s (!)", | |
124 | __func__, delete_message, ifp->name); | |
125 | return; | |
126 | } | |
127 | ||
128 | /* | |
129 | RFC 4601: 4.3.1. Sending Hello Messages | |
130 | ||
131 | Before an interface goes down or changes primary IP address, a Hello | |
132 | message with a zero HoldTime should be sent immediately (with the | |
133 | old IP address if the IP address changed). | |
134 | */ | |
135 | pim_hello_send(ifp, 0 /* zero-sec holdtime */); | |
136 | ||
137 | pim_neighbor_delete_all(ifp, delete_message); | |
138 | ||
139 | sock_close(ifp); | |
140 | } | |
141 | ||
142 | /* For now check dst address for hello, assrt and join/prune is all pim rtr */ | |
143 | static bool pim_pkt_dst_addr_ok(enum pim_msg_type type, pim_addr addr) | |
144 | { | |
145 | if ((type == PIM_MSG_TYPE_HELLO) || (type == PIM_MSG_TYPE_ASSERT) | |
146 | || (type == PIM_MSG_TYPE_JOIN_PRUNE)) { | |
147 | if (pim_addr_cmp(addr, qpim_all_pim_routers_addr)) | |
148 | return false; | |
149 | } | |
150 | ||
151 | return true; | |
152 | } | |
153 | ||
154 | int pim_pim_packet(struct interface *ifp, uint8_t *buf, size_t len, | |
155 | pim_sgaddr sg) | |
156 | { | |
157 | struct iovec iov[2], *iovp = iov; | |
158 | #if PIM_IPV == 4 | |
159 | struct ip *ip_hdr = (struct ip *)buf; | |
160 | size_t ip_hlen; /* ip header length in bytes */ | |
161 | #endif | |
162 | uint8_t *pim_msg; | |
163 | uint32_t pim_msg_len = 0; | |
164 | uint16_t pim_checksum; /* received checksum */ | |
165 | uint16_t checksum; /* computed checksum */ | |
166 | struct pim_neighbor *neigh; | |
167 | struct pim_msg_header *header; | |
168 | bool no_fwd; | |
169 | ||
170 | #if PIM_IPV == 4 | |
171 | if (len < sizeof(*ip_hdr)) { | |
172 | if (PIM_DEBUG_PIM_PACKETS) | |
173 | zlog_debug( | |
174 | "PIM packet size=%zu shorter than minimum=%zu", | |
175 | len, sizeof(*ip_hdr)); | |
176 | return -1; | |
177 | } | |
178 | ||
179 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
180 | sg = pim_sgaddr_from_iphdr(ip_hdr); | |
181 | ||
182 | pim_msg = buf + ip_hlen; | |
183 | pim_msg_len = len - ip_hlen; | |
184 | #else | |
185 | struct ipv6_ph phdr = { | |
186 | .src = sg.src, | |
187 | .dst = sg.grp, | |
188 | .ulpl = htonl(len), | |
189 | .next_hdr = IPPROTO_PIM, | |
190 | }; | |
191 | ||
192 | iovp->iov_base = &phdr; | |
193 | iovp->iov_len = sizeof(phdr); | |
194 | iovp++; | |
195 | ||
196 | /* NB: header is not included in IPv6 RX */ | |
197 | pim_msg = buf; | |
198 | pim_msg_len = len; | |
199 | #endif | |
200 | ||
201 | iovp->iov_base = pim_msg; | |
202 | iovp->iov_len = pim_msg_len; | |
203 | iovp++; | |
204 | ||
205 | header = (struct pim_msg_header *)pim_msg; | |
206 | if (pim_msg_len < PIM_PIM_MIN_LEN) { | |
207 | if (PIM_DEBUG_PIM_PACKETS) | |
208 | zlog_debug( | |
209 | "PIM message size=%d shorter than minimum=%d", | |
210 | pim_msg_len, PIM_PIM_MIN_LEN); | |
211 | return -1; | |
212 | } | |
213 | ||
214 | if (header->ver != PIM_PROTO_VERSION) { | |
215 | if (PIM_DEBUG_PIM_PACKETS) | |
216 | zlog_debug( | |
217 | "Ignoring PIM pkt from %s with unsupported version: %d", | |
218 | ifp->name, header->ver); | |
219 | return -1; | |
220 | } | |
221 | ||
222 | /* save received checksum */ | |
223 | pim_checksum = header->checksum; | |
224 | ||
225 | /* for computing checksum */ | |
226 | header->checksum = 0; | |
227 | no_fwd = header->Nbit; | |
228 | ||
229 | if (header->type == PIM_MSG_TYPE_REGISTER) { | |
230 | if (pim_msg_len < PIM_MSG_REGISTER_LEN) { | |
231 | if (PIM_DEBUG_PIM_PACKETS) | |
232 | zlog_debug("PIM Register Message size=%d shorther than min length %d", | |
233 | pim_msg_len, PIM_MSG_REGISTER_LEN); | |
234 | return -1; | |
235 | } | |
236 | ||
237 | #if PIM_IPV == 6 | |
238 | phdr.ulpl = htonl(PIM_MSG_REGISTER_LEN); | |
239 | #endif | |
240 | /* First 8 byte header checksum */ | |
241 | iovp[-1].iov_len = PIM_MSG_REGISTER_LEN; | |
242 | checksum = in_cksumv(iov, iovp - iov); | |
243 | ||
244 | if (checksum != pim_checksum) { | |
245 | #if PIM_IPV == 6 | |
246 | phdr.ulpl = htonl(pim_msg_len); | |
247 | #endif | |
248 | iovp[-1].iov_len = pim_msg_len; | |
249 | ||
250 | checksum = in_cksumv(iov, iovp - iov); | |
251 | if (checksum != pim_checksum) { | |
252 | if (PIM_DEBUG_PIM_PACKETS) | |
253 | zlog_debug( | |
254 | "Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
255 | ifp->name, pim_checksum, | |
256 | checksum); | |
257 | ||
258 | return -1; | |
259 | } | |
260 | } | |
261 | } else { | |
262 | checksum = in_cksumv(iov, iovp - iov); | |
263 | if (checksum != pim_checksum) { | |
264 | if (PIM_DEBUG_PIM_PACKETS) | |
265 | zlog_debug( | |
266 | "Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
267 | ifp->name, pim_checksum, checksum); | |
268 | ||
269 | return -1; | |
270 | } | |
271 | } | |
272 | ||
273 | if (PIM_DEBUG_PIM_PACKETS) { | |
274 | zlog_debug( | |
275 | "Recv PIM %s packet from %pPA to %pPA on %s: pim_version=%d pim_msg_size=%d checksum=%x", | |
276 | pim_pim_msgtype2str(header->type), &sg.src, &sg.grp, | |
277 | ifp->name, header->ver, pim_msg_len, checksum); | |
278 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) | |
279 | pim_pkt_dump(__func__, pim_msg, pim_msg_len); | |
280 | } | |
281 | ||
282 | if (!pim_pkt_dst_addr_ok(header->type, sg.grp)) { | |
283 | zlog_warn( | |
284 | "%s: Ignoring Pkt. Unexpected IP destination %pPA for %s (Expected: all_pim_routers_addr) from %pPA", | |
285 | __func__, &sg.grp, pim_pim_msgtype2str(header->type), | |
286 | &sg.src); | |
287 | return -1; | |
288 | } | |
289 | ||
290 | switch (header->type) { | |
291 | case PIM_MSG_TYPE_HELLO: | |
292 | return pim_hello_recv(ifp, sg.src, pim_msg + PIM_MSG_HEADER_LEN, | |
293 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
294 | break; | |
295 | case PIM_MSG_TYPE_REGISTER: | |
296 | return pim_register_recv(ifp, sg.grp, sg.src, | |
297 | pim_msg + PIM_MSG_HEADER_LEN, | |
298 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
299 | break; | |
300 | case PIM_MSG_TYPE_REG_STOP: | |
301 | return pim_register_stop_recv(ifp, pim_msg + PIM_MSG_HEADER_LEN, | |
302 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
303 | break; | |
304 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
305 | neigh = pim_neighbor_find(ifp, sg.src); | |
306 | if (!neigh) { | |
307 | if (PIM_DEBUG_PIM_PACKETS) | |
308 | zlog_debug( | |
309 | "%s %s: non-hello PIM message type=%d from non-neighbor %pPA on %s", | |
310 | __FILE__, __func__, header->type, | |
311 | &sg.src, ifp->name); | |
312 | return -1; | |
313 | } | |
314 | pim_neighbor_timer_reset(neigh, neigh->holdtime); | |
315 | return pim_joinprune_recv(ifp, neigh, sg.src, | |
316 | pim_msg + PIM_MSG_HEADER_LEN, | |
317 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
318 | break; | |
319 | case PIM_MSG_TYPE_ASSERT: | |
320 | neigh = pim_neighbor_find(ifp, sg.src); | |
321 | if (!neigh) { | |
322 | if (PIM_DEBUG_PIM_PACKETS) | |
323 | zlog_debug( | |
324 | "%s %s: non-hello PIM message type=%d from non-neighbor %pPA on %s", | |
325 | __FILE__, __func__, header->type, | |
326 | &sg.src, ifp->name); | |
327 | return -1; | |
328 | } | |
329 | pim_neighbor_timer_reset(neigh, neigh->holdtime); | |
330 | return pim_assert_recv(ifp, neigh, sg.src, | |
331 | pim_msg + PIM_MSG_HEADER_LEN, | |
332 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
333 | break; | |
334 | case PIM_MSG_TYPE_BOOTSTRAP: | |
335 | return pim_bsm_process(ifp, &sg, pim_msg, pim_msg_len, no_fwd); | |
336 | break; | |
337 | ||
338 | default: | |
339 | if (PIM_DEBUG_PIM_PACKETS) { | |
340 | zlog_debug( | |
341 | "Recv PIM packet type %d which is not currently understood", | |
342 | header->type); | |
343 | } | |
344 | return -1; | |
345 | } | |
346 | } | |
347 | ||
348 | static void pim_sock_read_on(struct interface *ifp); | |
349 | ||
350 | static void pim_sock_read(struct thread *t) | |
351 | { | |
352 | struct interface *ifp, *orig_ifp; | |
353 | struct pim_interface *pim_ifp; | |
354 | int fd; | |
355 | struct sockaddr_storage from; | |
356 | struct sockaddr_storage to; | |
357 | socklen_t fromlen = sizeof(from); | |
358 | socklen_t tolen = sizeof(to); | |
359 | uint8_t buf[PIM_PIM_BUFSIZE_READ]; | |
360 | int len; | |
361 | ifindex_t ifindex = -1; | |
362 | int result = -1; /* defaults to bad */ | |
363 | static long long count = 0; | |
364 | int cont = 1; | |
365 | ||
366 | orig_ifp = ifp = THREAD_ARG(t); | |
367 | fd = THREAD_FD(t); | |
368 | ||
369 | pim_ifp = ifp->info; | |
370 | ||
371 | while (cont) { | |
372 | pim_sgaddr sg; | |
373 | ||
374 | len = pim_socket_recvfromto(fd, buf, sizeof(buf), &from, | |
375 | &fromlen, &to, &tolen, &ifindex); | |
376 | if (len < 0) { | |
377 | if (errno == EINTR) | |
378 | continue; | |
379 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
380 | break; | |
381 | ||
382 | if (PIM_DEBUG_PIM_PACKETS) | |
383 | zlog_debug("Received errno: %d %s", errno, | |
384 | safe_strerror(errno)); | |
385 | goto done; | |
386 | } | |
387 | ||
388 | /* | |
389 | * What? So with vrf's the incoming packet is received | |
390 | * on the vrf interface but recvfromto above returns | |
391 | * the right ifindex, so just use it. We know | |
392 | * it's the right interface because we bind to it | |
393 | */ | |
394 | ifp = if_lookup_by_index(ifindex, pim_ifp->pim->vrf->vrf_id); | |
395 | if (!ifp || !ifp->info) { | |
396 | if (PIM_DEBUG_PIM_PACKETS) | |
397 | zlog_debug( | |
398 | "%s: Received incoming pim packet on interface(%s:%d) not yet configured for pim", | |
399 | __func__, ifp ? ifp->name : "Unknown", | |
400 | ifindex); | |
401 | goto done; | |
402 | } | |
403 | #if PIM_IPV == 4 | |
404 | sg.src = ((struct sockaddr_in *)&from)->sin_addr; | |
405 | sg.grp = ((struct sockaddr_in *)&to)->sin_addr; | |
406 | #else | |
407 | sg.src = ((struct sockaddr_in6 *)&from)->sin6_addr; | |
408 | sg.grp = ((struct sockaddr_in6 *)&to)->sin6_addr; | |
409 | #endif | |
410 | ||
411 | int fail = pim_pim_packet(ifp, buf, len, sg); | |
412 | if (fail) { | |
413 | if (PIM_DEBUG_PIM_PACKETS) | |
414 | zlog_debug("%s: pim_pim_packet() return=%d", | |
415 | __func__, fail); | |
416 | goto done; | |
417 | } | |
418 | ||
419 | count++; | |
420 | if (count % router->packet_process == 0) | |
421 | cont = 0; | |
422 | } | |
423 | ||
424 | result = 0; /* good */ | |
425 | ||
426 | done: | |
427 | pim_sock_read_on(orig_ifp); | |
428 | ||
429 | if (result) { | |
430 | ++pim_ifp->pim_ifstat_hello_recvfail; | |
431 | } | |
432 | } | |
433 | ||
434 | static void pim_sock_read_on(struct interface *ifp) | |
435 | { | |
436 | struct pim_interface *pim_ifp; | |
437 | ||
438 | assert(ifp); | |
439 | assert(ifp->info); | |
440 | ||
441 | pim_ifp = ifp->info; | |
442 | ||
443 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { | |
444 | zlog_debug("Scheduling READ event on PIM socket fd=%d", | |
445 | pim_ifp->pim_sock_fd); | |
446 | } | |
447 | thread_add_read(router->master, pim_sock_read, ifp, | |
448 | pim_ifp->pim_sock_fd, &pim_ifp->t_pim_sock_read); | |
449 | } | |
450 | ||
451 | static int pim_sock_open(struct interface *ifp) | |
452 | { | |
453 | int fd; | |
454 | struct pim_interface *pim_ifp = ifp->info; | |
455 | ||
456 | fd = pim_socket_mcast(IPPROTO_PIM, pim_ifp->primary_address, ifp, | |
457 | 0 /* loop=false */); | |
458 | if (fd < 0) | |
459 | return -1; | |
460 | ||
461 | if (pim_socket_join(fd, qpim_all_pim_routers_addr, | |
462 | pim_ifp->primary_address, ifp->ifindex, pim_ifp)) { | |
463 | close(fd); | |
464 | return -2; | |
465 | } | |
466 | ||
467 | return fd; | |
468 | } | |
469 | ||
470 | void pim_ifstat_reset(struct interface *ifp) | |
471 | { | |
472 | struct pim_interface *pim_ifp; | |
473 | ||
474 | assert(ifp); | |
475 | ||
476 | pim_ifp = ifp->info; | |
477 | if (!pim_ifp) { | |
478 | return; | |
479 | } | |
480 | ||
481 | pim_ifp->pim_ifstat_start = pim_time_monotonic_sec(); | |
482 | pim_ifp->pim_ifstat_hello_sent = 0; | |
483 | pim_ifp->pim_ifstat_hello_sendfail = 0; | |
484 | pim_ifp->pim_ifstat_hello_recv = 0; | |
485 | pim_ifp->pim_ifstat_hello_recvfail = 0; | |
486 | pim_ifp->pim_ifstat_bsm_rx = 0; | |
487 | pim_ifp->pim_ifstat_bsm_tx = 0; | |
488 | pim_ifp->pim_ifstat_join_recv = 0; | |
489 | pim_ifp->pim_ifstat_join_send = 0; | |
490 | pim_ifp->pim_ifstat_prune_recv = 0; | |
491 | pim_ifp->pim_ifstat_prune_send = 0; | |
492 | pim_ifp->pim_ifstat_reg_recv = 0; | |
493 | pim_ifp->pim_ifstat_reg_send = 0; | |
494 | pim_ifp->pim_ifstat_reg_stop_recv = 0; | |
495 | pim_ifp->pim_ifstat_reg_stop_send = 0; | |
496 | pim_ifp->pim_ifstat_assert_recv = 0; | |
497 | pim_ifp->pim_ifstat_assert_send = 0; | |
498 | pim_ifp->pim_ifstat_bsm_cfg_miss = 0; | |
499 | pim_ifp->pim_ifstat_ucast_bsm_cfg_miss = 0; | |
500 | pim_ifp->pim_ifstat_bsm_invalid_sz = 0; | |
501 | pim_ifp->igmp_ifstat_joins_sent = 0; | |
502 | pim_ifp->igmp_ifstat_joins_failed = 0; | |
503 | pim_ifp->igmp_peak_group_count = 0; | |
504 | } | |
505 | ||
506 | void pim_sock_reset(struct interface *ifp) | |
507 | { | |
508 | struct pim_interface *pim_ifp; | |
509 | ||
510 | assert(ifp); | |
511 | assert(ifp->info); | |
512 | ||
513 | pim_ifp = ifp->info; | |
514 | ||
515 | pim_ifp->primary_address = pim_find_primary_addr(ifp); | |
516 | ||
517 | pim_ifp->pim_sock_fd = -1; | |
518 | pim_ifp->pim_sock_creation = 0; | |
519 | pim_ifp->t_pim_sock_read = NULL; | |
520 | ||
521 | pim_ifp->t_pim_hello_timer = NULL; | |
522 | pim_ifp->pim_hello_period = PIM_DEFAULT_HELLO_PERIOD; | |
523 | pim_ifp->pim_default_holdtime = | |
524 | -1; /* unset: means 3.5 * pim_hello_period */ | |
525 | pim_ifp->pim_triggered_hello_delay = PIM_DEFAULT_TRIGGERED_HELLO_DELAY; | |
526 | pim_ifp->pim_dr_priority = PIM_DEFAULT_DR_PRIORITY; | |
527 | pim_ifp->pim_propagation_delay_msec = | |
528 | PIM_DEFAULT_PROPAGATION_DELAY_MSEC; | |
529 | pim_ifp->pim_override_interval_msec = | |
530 | PIM_DEFAULT_OVERRIDE_INTERVAL_MSEC; | |
531 | pim_ifp->pim_can_disable_join_suppression = | |
532 | PIM_DEFAULT_CAN_DISABLE_JOIN_SUPPRESSION; | |
533 | ||
534 | /* neighbors without lan_delay */ | |
535 | pim_ifp->pim_number_of_nonlandelay_neighbors = 0; | |
536 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = 0; | |
537 | pim_ifp->pim_neighbors_highest_override_interval_msec = 0; | |
538 | ||
539 | /* DR Election */ | |
540 | pim_ifp->pim_dr_election_last = 0; /* timestamp */ | |
541 | pim_ifp->pim_dr_election_count = 0; | |
542 | pim_ifp->pim_dr_election_changes = 0; | |
543 | pim_ifp->pim_dr_num_nondrpri_neighbors = | |
544 | 0; /* neighbors without dr_pri */ | |
545 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
546 | pim_ifp->am_i_dr = true; | |
547 | ||
548 | pim_ifstat_reset(ifp); | |
549 | } | |
550 | ||
551 | #if PIM_IPV == 4 | |
552 | static uint16_t ip_id = 0; | |
553 | #endif | |
554 | ||
555 | #if PIM_IPV == 4 | |
556 | static int pim_msg_send_frame(int fd, char *buf, size_t len, | |
557 | struct sockaddr *dst, size_t salen, | |
558 | const char *ifname) | |
559 | { | |
560 | if (sendto(fd, buf, len, MSG_DONTWAIT, dst, salen) >= 0) | |
561 | return 0; | |
562 | ||
563 | if (errno == EMSGSIZE) { | |
564 | struct ip *ip = (struct ip *)buf; | |
565 | size_t hdrsize = sizeof(struct ip); | |
566 | size_t newlen1 = ((len - hdrsize) / 2) & 0xFFF8; | |
567 | size_t sendlen = newlen1 + hdrsize; | |
568 | size_t offset = ntohs(ip->ip_off); | |
569 | int ret; | |
570 | ||
571 | ip->ip_len = htons(sendlen); | |
572 | ip->ip_off = htons(offset | IP_MF); | |
573 | ||
574 | ret = pim_msg_send_frame(fd, buf, sendlen, dst, salen, ifname); | |
575 | if (ret) | |
576 | return ret; | |
577 | ||
578 | struct ip *ip2 = (struct ip *)(buf + newlen1); | |
579 | size_t newlen2 = len - sendlen; | |
580 | ||
581 | sendlen = newlen2 + hdrsize; | |
582 | ||
583 | memcpy(ip2, ip, hdrsize); | |
584 | ip2->ip_len = htons(sendlen); | |
585 | ip2->ip_off = htons(offset + (newlen1 >> 3)); | |
586 | return pim_msg_send_frame(fd, (char *)ip2, sendlen, dst, salen, | |
587 | ifname); | |
588 | } | |
589 | ||
590 | zlog_warn( | |
591 | "%s: sendto() failure to %pSU: iface=%s fd=%d msg_size=%zd: %m", | |
592 | __func__, dst, ifname, fd, len); | |
593 | return -1; | |
594 | } | |
595 | ||
596 | #else | |
597 | static int pim_msg_send_frame(pim_addr src, pim_addr dst, ifindex_t ifindex, | |
598 | struct iovec *message, int fd) | |
599 | { | |
600 | int retval; | |
601 | struct msghdr smsghdr = {}; | |
602 | struct cmsghdr *scmsgp; | |
603 | union cmsgbuf { | |
604 | struct cmsghdr hdr; | |
605 | uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
606 | }; | |
607 | struct in6_pktinfo *pktinfo; | |
608 | struct sockaddr_in6 dst_sin6 = {}; | |
609 | ||
610 | union cmsgbuf cmsg_buf = {}; | |
611 | ||
612 | /* destination address */ | |
613 | dst_sin6.sin6_family = AF_INET6; | |
614 | #ifdef SIN6_LEN | |
615 | dst_sin6.sin6_len = sizeof(struct sockaddr_in6); | |
616 | #endif /*SIN6_LEN*/ | |
617 | dst_sin6.sin6_addr = dst; | |
618 | dst_sin6.sin6_scope_id = ifindex; | |
619 | ||
620 | /* send msg hdr */ | |
621 | smsghdr.msg_iov = message; | |
622 | smsghdr.msg_iovlen = 1; | |
623 | smsghdr.msg_name = (caddr_t)&dst_sin6; | |
624 | smsghdr.msg_namelen = sizeof(dst_sin6); | |
625 | smsghdr.msg_control = (caddr_t)&cmsg_buf.buf; | |
626 | smsghdr.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); | |
627 | smsghdr.msg_flags = 0; | |
628 | ||
629 | scmsgp = CMSG_FIRSTHDR(&smsghdr); | |
630 | scmsgp->cmsg_level = IPPROTO_IPV6; | |
631 | scmsgp->cmsg_type = IPV6_PKTINFO; | |
632 | scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); | |
633 | ||
634 | pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp)); | |
635 | pktinfo->ipi6_ifindex = ifindex; | |
636 | pktinfo->ipi6_addr = src; | |
637 | ||
638 | retval = sendmsg(fd, &smsghdr, 0); | |
639 | if (retval < 0) | |
640 | flog_err( | |
641 | EC_LIB_SOCKET, | |
642 | "sendmsg failed: source: %pI6 Dest: %pI6 ifindex: %d: %s (%d)", | |
643 | &src, &dst, ifindex, safe_strerror(errno), errno); | |
644 | ||
645 | return retval; | |
646 | } | |
647 | #endif | |
648 | ||
649 | int pim_msg_send(int fd, pim_addr src, pim_addr dst, uint8_t *pim_msg, | |
650 | int pim_msg_size, struct interface *ifp) | |
651 | { | |
652 | struct pim_interface *pim_ifp; | |
653 | ||
654 | ||
655 | pim_ifp = ifp->info; | |
656 | ||
657 | if (pim_ifp->pim_passive_enable) { | |
658 | if (PIM_DEBUG_PIM_PACKETS) | |
659 | zlog_debug( | |
660 | "skip sending PIM message on passive interface %s", | |
661 | ifp->name); | |
662 | return 0; | |
663 | } | |
664 | ||
665 | #if PIM_IPV == 4 | |
666 | uint8_t ttl; | |
667 | struct pim_msg_header *header; | |
668 | unsigned char buffer[10000]; | |
669 | ||
670 | memset(buffer, 0, 10000); | |
671 | ||
672 | header = (struct pim_msg_header *)pim_msg; | |
673 | ||
674 | /* | |
675 | * Omnios apparently doesn't have a #define for IP default | |
676 | * ttl that is the same as all other platforms. | |
677 | */ | |
678 | #ifndef IPDEFTTL | |
679 | #define IPDEFTTL 64 | |
680 | #endif | |
681 | /* TTL for packets destine to ALL-PIM-ROUTERS is 1 */ | |
682 | switch (header->type) { | |
683 | case PIM_MSG_TYPE_HELLO: | |
684 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
685 | case PIM_MSG_TYPE_BOOTSTRAP: | |
686 | case PIM_MSG_TYPE_ASSERT: | |
687 | ttl = 1; | |
688 | break; | |
689 | case PIM_MSG_TYPE_REGISTER: | |
690 | case PIM_MSG_TYPE_REG_STOP: | |
691 | case PIM_MSG_TYPE_GRAFT: | |
692 | case PIM_MSG_TYPE_GRAFT_ACK: | |
693 | case PIM_MSG_TYPE_CANDIDATE: | |
694 | ttl = IPDEFTTL; | |
695 | break; | |
696 | default: | |
697 | ttl = MAXTTL; | |
698 | break; | |
699 | } | |
700 | ||
701 | struct ip *ip = (struct ip *)buffer; | |
702 | struct sockaddr_in to = {}; | |
703 | int sendlen = sizeof(*ip) + pim_msg_size; | |
704 | socklen_t tolen; | |
705 | unsigned char *msg_start; | |
706 | ||
707 | ip->ip_id = htons(++ip_id); | |
708 | ip->ip_hl = 5; | |
709 | ip->ip_v = 4; | |
710 | ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; | |
711 | ip->ip_p = PIM_IP_PROTO_PIM; | |
712 | ip->ip_src = src; | |
713 | ip->ip_dst = dst; | |
714 | ip->ip_ttl = ttl; | |
715 | ip->ip_len = htons(sendlen); | |
716 | ||
717 | to.sin_family = AF_INET; | |
718 | to.sin_addr = dst; | |
719 | tolen = sizeof(to); | |
720 | ||
721 | msg_start = buffer + sizeof(*ip); | |
722 | memcpy(msg_start, pim_msg, pim_msg_size); | |
723 | ||
724 | if (PIM_DEBUG_PIM_PACKETS) | |
725 | zlog_debug("%s: to %pPA on %s: msg_size=%d checksum=%x", | |
726 | __func__, &dst, ifp->name, pim_msg_size, | |
727 | header->checksum); | |
728 | ||
729 | if (PIM_DEBUG_PIM_PACKETDUMP_SEND) { | |
730 | pim_pkt_dump(__func__, pim_msg, pim_msg_size); | |
731 | } | |
732 | ||
733 | pim_msg_send_frame(fd, (char *)buffer, sendlen, (struct sockaddr *)&to, | |
734 | tolen, ifp->name); | |
735 | return 0; | |
736 | ||
737 | #else | |
738 | struct iovec iovector[2]; | |
739 | ||
740 | iovector[0].iov_base = pim_msg; | |
741 | iovector[0].iov_len = pim_msg_size; | |
742 | ||
743 | pim_msg_send_frame(src, dst, ifp->ifindex, &iovector[0], fd); | |
744 | ||
745 | return 0; | |
746 | #endif | |
747 | } | |
748 | ||
749 | static int hello_send(struct interface *ifp, uint16_t holdtime) | |
750 | { | |
751 | uint8_t pim_msg[PIM_PIM_BUFSIZE_WRITE]; | |
752 | struct pim_interface *pim_ifp; | |
753 | int pim_tlv_size; | |
754 | int pim_msg_size; | |
755 | ||
756 | pim_ifp = ifp->info; | |
757 | ||
758 | if (PIM_DEBUG_PIM_HELLO) | |
759 | zlog_debug( | |
760 | "%s: to %pPA on %s: holdt=%u prop_d=%u overr_i=%u dis_join_supp=%d dr_prio=%u gen_id=%08x addrs=%d", | |
761 | __func__, &qpim_all_pim_routers_addr, ifp->name, | |
762 | holdtime, pim_ifp->pim_propagation_delay_msec, | |
763 | pim_ifp->pim_override_interval_msec, | |
764 | pim_ifp->pim_can_disable_join_suppression, | |
765 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
766 | listcount(ifp->connected)); | |
767 | ||
768 | pim_tlv_size = pim_hello_build_tlv( | |
769 | ifp, pim_msg + PIM_PIM_MIN_LEN, | |
770 | sizeof(pim_msg) - PIM_PIM_MIN_LEN, holdtime, | |
771 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
772 | pim_ifp->pim_propagation_delay_msec, | |
773 | pim_ifp->pim_override_interval_msec, | |
774 | pim_ifp->pim_can_disable_join_suppression); | |
775 | if (pim_tlv_size < 0) { | |
776 | return -1; | |
777 | } | |
778 | ||
779 | pim_msg_size = pim_tlv_size + PIM_PIM_MIN_LEN; | |
780 | ||
781 | assert(pim_msg_size >= PIM_PIM_MIN_LEN); | |
782 | assert(pim_msg_size <= PIM_PIM_BUFSIZE_WRITE); | |
783 | ||
784 | pim_msg_build_header(pim_ifp->primary_address, | |
785 | qpim_all_pim_routers_addr, pim_msg, pim_msg_size, | |
786 | PIM_MSG_TYPE_HELLO, false); | |
787 | ||
788 | if (pim_msg_send(pim_ifp->pim_sock_fd, pim_ifp->primary_address, | |
789 | qpim_all_pim_routers_addr, pim_msg, pim_msg_size, | |
790 | ifp)) { | |
791 | if (PIM_DEBUG_PIM_HELLO) { | |
792 | zlog_debug( | |
793 | "%s: could not send PIM message on interface %s", | |
794 | __func__, ifp->name); | |
795 | } | |
796 | return -2; | |
797 | } | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | int pim_hello_send(struct interface *ifp, uint16_t holdtime) | |
803 | { | |
804 | struct pim_interface *pim_ifp = ifp->info; | |
805 | ||
806 | if (if_is_loopback(ifp)) | |
807 | return 0; | |
808 | ||
809 | if (hello_send(ifp, holdtime)) { | |
810 | ++pim_ifp->pim_ifstat_hello_sendfail; | |
811 | ||
812 | if (PIM_DEBUG_PIM_HELLO) { | |
813 | zlog_warn("Could not send PIM hello on interface %s", | |
814 | ifp->name); | |
815 | } | |
816 | return -1; | |
817 | } | |
818 | ||
819 | if (!pim_ifp->pim_passive_enable) { | |
820 | ++pim_ifp->pim_ifstat_hello_sent; | |
821 | PIM_IF_FLAG_SET_HELLO_SENT(pim_ifp->flags); | |
822 | } | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | static void hello_resched(struct interface *ifp) | |
828 | { | |
829 | struct pim_interface *pim_ifp; | |
830 | ||
831 | pim_ifp = ifp->info; | |
832 | ||
833 | if (PIM_DEBUG_PIM_HELLO) { | |
834 | zlog_debug("Rescheduling %d sec hello on interface %s", | |
835 | pim_ifp->pim_hello_period, ifp->name); | |
836 | } | |
837 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
838 | thread_add_timer(router->master, on_pim_hello_send, ifp, | |
839 | pim_ifp->pim_hello_period, | |
840 | &pim_ifp->t_pim_hello_timer); | |
841 | } | |
842 | ||
843 | /* | |
844 | Periodic hello timer | |
845 | */ | |
846 | static void on_pim_hello_send(struct thread *t) | |
847 | { | |
848 | struct pim_interface *pim_ifp; | |
849 | struct interface *ifp; | |
850 | ||
851 | ifp = THREAD_ARG(t); | |
852 | pim_ifp = ifp->info; | |
853 | ||
854 | /* | |
855 | * Schedule next hello | |
856 | */ | |
857 | hello_resched(ifp); | |
858 | ||
859 | /* | |
860 | * Send hello | |
861 | */ | |
862 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
863 | } | |
864 | ||
865 | /* | |
866 | RFC 4601: 4.3.1. Sending Hello Messages | |
867 | ||
868 | Thus, if a router needs to send a Join/Prune or Assert message on an | |
869 | interface on which it has not yet sent a Hello message with the | |
870 | currently configured IP address, then it MUST immediately send the | |
871 | relevant Hello message without waiting for the Hello Timer to | |
872 | expire, followed by the Join/Prune or Assert message. | |
873 | */ | |
874 | void pim_hello_restart_now(struct interface *ifp) | |
875 | { | |
876 | struct pim_interface *pim_ifp; | |
877 | ||
878 | pim_ifp = ifp->info; | |
879 | ||
880 | /* | |
881 | * Reset next hello timer | |
882 | */ | |
883 | hello_resched(ifp); | |
884 | ||
885 | /* | |
886 | * Immediately send hello | |
887 | */ | |
888 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
889 | } | |
890 | ||
891 | /* | |
892 | RFC 4601: 4.3.1. Sending Hello Messages | |
893 | ||
894 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
895 | when a Hello message is received from a new neighbor, or a Hello | |
896 | message with a new GenID is received from an existing neighbor, a | |
897 | new Hello message should be sent on this interface after a | |
898 | randomized delay between 0 and Triggered_Hello_Delay. | |
899 | */ | |
900 | void pim_hello_restart_triggered(struct interface *ifp) | |
901 | { | |
902 | struct pim_interface *pim_ifp; | |
903 | int triggered_hello_delay_msec; | |
904 | int random_msec; | |
905 | ||
906 | pim_ifp = ifp->info; | |
907 | ||
908 | /* | |
909 | * No need to ever start loopback or vrf device hello's | |
910 | */ | |
911 | if (if_is_loopback(ifp)) | |
912 | return; | |
913 | ||
914 | /* | |
915 | * There exists situations where we have the a RPF out this | |
916 | * interface, but we haven't formed a neighbor yet. This | |
917 | * happens especially during interface flaps. While | |
918 | * we would like to handle this more gracefully in other | |
919 | * parts of the code. In order to get us up and running | |
920 | * let's just send the hello immediate'ish | |
921 | * This should be revisited when we get nexthop tracking | |
922 | * in and when we have a better handle on safely | |
923 | * handling the rpf information for upstreams that | |
924 | * we cannot legally reach yet. | |
925 | */ | |
926 | triggered_hello_delay_msec = 1; | |
927 | // triggered_hello_delay_msec = 1000 * | |
928 | // pim_ifp->pim_triggered_hello_delay; | |
929 | ||
930 | if (pim_ifp->t_pim_hello_timer) { | |
931 | long remain_msec = | |
932 | pim_time_timer_remain_msec(pim_ifp->t_pim_hello_timer); | |
933 | if (remain_msec <= triggered_hello_delay_msec) { | |
934 | /* Rescheduling hello would increase the delay, then | |
935 | it's faster | |
936 | to just wait for the scheduled periodic hello. */ | |
937 | return; | |
938 | } | |
939 | ||
940 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
941 | } | |
942 | ||
943 | random_msec = triggered_hello_delay_msec; | |
944 | // random_msec = random() % (triggered_hello_delay_msec + 1); | |
945 | ||
946 | if (PIM_DEBUG_PIM_HELLO) { | |
947 | zlog_debug("Scheduling %d msec triggered hello on interface %s", | |
948 | random_msec, ifp->name); | |
949 | } | |
950 | ||
951 | thread_add_timer_msec(router->master, on_pim_hello_send, ifp, | |
952 | random_msec, &pim_ifp->t_pim_hello_timer); | |
953 | } | |
954 | ||
955 | int pim_sock_add(struct interface *ifp) | |
956 | { | |
957 | struct pim_interface *pim_ifp; | |
958 | uint32_t old_genid; | |
959 | ||
960 | pim_ifp = ifp->info; | |
961 | assert(pim_ifp); | |
962 | ||
963 | if (pim_ifp->pim_sock_fd >= 0) { | |
964 | if (PIM_DEBUG_PIM_PACKETS) | |
965 | zlog_debug( | |
966 | "Can't recreate existing PIM socket fd=%d for interface %s", | |
967 | pim_ifp->pim_sock_fd, ifp->name); | |
968 | return -1; | |
969 | } | |
970 | ||
971 | pim_ifp->pim_sock_fd = pim_sock_open(ifp); | |
972 | if (pim_ifp->pim_sock_fd < 0) { | |
973 | if (PIM_DEBUG_PIM_PACKETS) | |
974 | zlog_debug("Could not open PIM socket on interface %s", | |
975 | ifp->name); | |
976 | return -2; | |
977 | } | |
978 | ||
979 | pim_socket_ip_hdr(pim_ifp->pim_sock_fd); | |
980 | ||
981 | pim_ifp->t_pim_sock_read = NULL; | |
982 | pim_ifp->pim_sock_creation = pim_time_monotonic_sec(); | |
983 | ||
984 | /* | |
985 | * Just ensure that the new generation id | |
986 | * actually chooses something different. | |
987 | * Actually ran across a case where this | |
988 | * happened, pre-switch to random(). | |
989 | * While this is unlikely to happen now | |
990 | * let's make sure it doesn't. | |
991 | */ | |
992 | old_genid = pim_ifp->pim_generation_id; | |
993 | ||
994 | while (old_genid == pim_ifp->pim_generation_id) | |
995 | pim_ifp->pim_generation_id = frr_weak_random(); | |
996 | ||
997 | zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d", ifp->name, | |
998 | ifp->ifindex); | |
999 | ||
1000 | /* | |
1001 | * Start receiving PIM messages | |
1002 | */ | |
1003 | pim_sock_read_on(ifp); | |
1004 | ||
1005 | /* | |
1006 | * Start sending PIM hello's | |
1007 | */ | |
1008 | pim_hello_restart_triggered(ifp); | |
1009 | ||
1010 | return 0; | |
1011 | } |