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Commit | Line | Data |
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12e41d03 | 1 | /* |
896014f4 DL |
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 | */ | |
12e41d03 DL |
19 | |
20 | #include <zebra.h> | |
21 | ||
22 | #include "log.h" | |
23 | #include "thread.h" | |
24 | #include "memory.h" | |
744d91b3 | 25 | #include "if.h" |
12e41d03 DL |
26 | |
27 | #include "pimd.h" | |
28 | #include "pim_pim.h" | |
29 | #include "pim_time.h" | |
30 | #include "pim_iface.h" | |
31 | #include "pim_sock.h" | |
32 | #include "pim_str.h" | |
33 | #include "pim_util.h" | |
34 | #include "pim_tlv.h" | |
35 | #include "pim_neighbor.h" | |
36 | #include "pim_hello.h" | |
37 | #include "pim_join.h" | |
38 | #include "pim_assert.h" | |
39 | #include "pim_msg.h" | |
77e390e5 | 40 | #include "pim_register.h" |
d9ff4302 | 41 | #include "pim_errors.h" |
d57a8bbf | 42 | #include "pim_bsm.h" |
12e41d03 DL |
43 | |
44 | static int on_pim_hello_send(struct thread *t); | |
d62a17ae | 45 | static int pim_hello_send(struct interface *ifp, uint16_t holdtime); |
12e41d03 | 46 | |
d62a17ae | 47 | static const char *pim_pim_msgtype2str(enum pim_msg_type type) |
7643f0a1 | 48 | { |
d62a17ae | 49 | switch (type) { |
50 | case PIM_MSG_TYPE_HELLO: | |
51 | return "HELLO"; | |
52 | case PIM_MSG_TYPE_REGISTER: | |
53 | return "REGISTER"; | |
54 | case PIM_MSG_TYPE_REG_STOP: | |
55 | return "REGSTOP"; | |
56 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
57 | return "JOINPRUNE"; | |
58 | case PIM_MSG_TYPE_BOOTSTRAP: | |
59 | return "BOOT"; | |
60 | case PIM_MSG_TYPE_ASSERT: | |
61 | return "ASSERT"; | |
62 | case PIM_MSG_TYPE_GRAFT: | |
63 | return "GRAFT"; | |
64 | case PIM_MSG_TYPE_GRAFT_ACK: | |
65 | return "GACK"; | |
66 | case PIM_MSG_TYPE_CANDIDATE: | |
67 | return "CANDIDATE"; | |
68 | } | |
69 | ||
70 | return "UNKNOWN"; | |
7643f0a1 DS |
71 | } |
72 | ||
12e41d03 DL |
73 | static void sock_close(struct interface *ifp) |
74 | { | |
d62a17ae | 75 | struct pim_interface *pim_ifp = ifp->info; |
76 | ||
77 | if (PIM_DEBUG_PIM_TRACE) { | |
78 | if (pim_ifp->t_pim_sock_read) { | |
79 | zlog_debug( | |
80 | "Cancelling READ event for PIM socket fd=%d on interface %s", | |
81 | pim_ifp->pim_sock_fd, ifp->name); | |
82 | } | |
83 | } | |
84 | THREAD_OFF(pim_ifp->t_pim_sock_read); | |
85 | ||
86 | if (PIM_DEBUG_PIM_TRACE) { | |
87 | if (pim_ifp->t_pim_hello_timer) { | |
88 | zlog_debug( | |
89 | "Cancelling PIM hello timer for interface %s", | |
90 | ifp->name); | |
91 | } | |
92 | } | |
93 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
94 | ||
95 | if (PIM_DEBUG_PIM_TRACE) { | |
96 | zlog_debug("Deleting PIM socket fd=%d on interface %s", | |
97 | pim_ifp->pim_sock_fd, ifp->name); | |
98 | } | |
99 | ||
100 | /* | |
101 | * If the fd is already deleted no need to do anything here | |
102 | */ | |
103 | if (pim_ifp->pim_sock_fd > 0 && close(pim_ifp->pim_sock_fd)) { | |
104 | zlog_warn( | |
105 | "Failure closing PIM socket fd=%d on interface %s: errno=%d: %s", | |
106 | pim_ifp->pim_sock_fd, ifp->name, errno, | |
107 | safe_strerror(errno)); | |
108 | } | |
109 | ||
110 | pim_ifp->pim_sock_fd = -1; | |
111 | pim_ifp->pim_sock_creation = 0; | |
12e41d03 DL |
112 | } |
113 | ||
114 | void pim_sock_delete(struct interface *ifp, const char *delete_message) | |
115 | { | |
d62a17ae | 116 | zlog_info("PIM INTERFACE DOWN: on interface %s: %s", ifp->name, |
117 | delete_message); | |
118 | ||
119 | if (!ifp->info) { | |
298004a1 | 120 | flog_err(EC_PIM_CONFIG, |
1c50c1c0 QY |
121 | "%s: %s: but PIM not enabled on interface %s (!)", |
122 | __PRETTY_FUNCTION__, delete_message, ifp->name); | |
d62a17ae | 123 | return; |
124 | } | |
125 | ||
126 | /* | |
127 | RFC 4601: 4.3.1. Sending Hello Messages | |
128 | ||
129 | Before an interface goes down or changes primary IP address, a Hello | |
130 | message with a zero HoldTime should be sent immediately (with the | |
131 | old IP address if the IP address changed). | |
132 | */ | |
133 | pim_hello_send(ifp, 0 /* zero-sec holdtime */); | |
134 | ||
135 | pim_neighbor_delete_all(ifp, delete_message); | |
136 | ||
137 | sock_close(ifp); | |
12e41d03 DL |
138 | } |
139 | ||
140 | int pim_pim_packet(struct interface *ifp, uint8_t *buf, size_t len) | |
141 | { | |
d62a17ae | 142 | struct ip *ip_hdr; |
143 | size_t ip_hlen; /* ip header length in bytes */ | |
144 | char src_str[INET_ADDRSTRLEN]; | |
145 | char dst_str[INET_ADDRSTRLEN]; | |
146 | uint8_t *pim_msg; | |
147 | int pim_msg_len; | |
148 | uint16_t pim_checksum; /* received checksum */ | |
149 | uint16_t checksum; /* computed checksum */ | |
150 | struct pim_neighbor *neigh; | |
151 | struct pim_msg_header *header; | |
5acde1cf | 152 | bool no_fwd; |
d62a17ae | 153 | |
154 | if (len < sizeof(*ip_hdr)) { | |
155 | if (PIM_DEBUG_PIM_PACKETS) | |
156 | zlog_debug( | |
157 | "PIM packet size=%zu shorter than minimum=%zu", | |
158 | len, sizeof(*ip_hdr)); | |
159 | return -1; | |
160 | } | |
161 | ||
162 | ip_hdr = (struct ip *)buf; | |
163 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
164 | ||
165 | pim_msg = buf + ip_hlen; | |
166 | pim_msg_len = len - ip_hlen; | |
167 | ||
168 | header = (struct pim_msg_header *)pim_msg; | |
169 | if (pim_msg_len < PIM_PIM_MIN_LEN) { | |
170 | if (PIM_DEBUG_PIM_PACKETS) | |
171 | zlog_debug( | |
172 | "PIM message size=%d shorter than minimum=%d", | |
173 | pim_msg_len, PIM_PIM_MIN_LEN); | |
174 | return -1; | |
175 | } | |
176 | ||
177 | if (header->ver != PIM_PROTO_VERSION) { | |
178 | if (PIM_DEBUG_PIM_PACKETS) | |
179 | zlog_debug( | |
180 | "Ignoring PIM pkt from %s with unsupported version: %d", | |
181 | ifp->name, header->ver); | |
182 | return -1; | |
183 | } | |
184 | ||
185 | /* save received checksum */ | |
186 | pim_checksum = header->checksum; | |
187 | ||
188 | /* for computing checksum */ | |
189 | header->checksum = 0; | |
5acde1cf | 190 | no_fwd = header->Nbit; |
d62a17ae | 191 | |
192 | if (header->type == PIM_MSG_TYPE_REGISTER) { | |
06424db4 DS |
193 | if (pim_msg_len < PIM_MSG_REGISTER_LEN) { |
194 | if (PIM_DEBUG_PIM_PACKETS) | |
195 | zlog_debug("PIM Register Message size=%d shorther than min length %d", | |
196 | pim_msg_len, PIM_MSG_REGISTER_LEN); | |
197 | return -1; | |
198 | } | |
d62a17ae | 199 | /* First 8 byte header checksum */ |
200 | checksum = in_cksum(pim_msg, PIM_MSG_REGISTER_LEN); | |
201 | if (checksum != pim_checksum) { | |
202 | checksum = in_cksum(pim_msg, pim_msg_len); | |
203 | if (checksum != pim_checksum) { | |
204 | if (PIM_DEBUG_PIM_PACKETS) | |
205 | zlog_debug( | |
206 | "Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
207 | ifp->name, pim_checksum, | |
208 | checksum); | |
209 | ||
210 | return -1; | |
211 | } | |
212 | } | |
213 | } else { | |
214 | checksum = in_cksum(pim_msg, pim_msg_len); | |
215 | if (checksum != pim_checksum) { | |
216 | if (PIM_DEBUG_PIM_PACKETS) | |
217 | zlog_debug( | |
218 | "Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
219 | ifp->name, pim_checksum, checksum); | |
220 | ||
221 | return -1; | |
222 | } | |
223 | } | |
224 | ||
225 | if (PIM_DEBUG_PIM_PACKETS) { | |
226 | pim_inet4_dump("<src?>", ip_hdr->ip_src, src_str, | |
227 | sizeof(src_str)); | |
228 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, dst_str, | |
229 | sizeof(dst_str)); | |
230 | zlog_debug( | |
231 | "Recv PIM %s packet from %s to %s on %s: ttl=%d pim_version=%d pim_msg_size=%d checksum=%x", | |
232 | pim_pim_msgtype2str(header->type), src_str, dst_str, | |
233 | ifp->name, ip_hdr->ip_ttl, header->ver, pim_msg_len, | |
234 | checksum); | |
235 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) { | |
236 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_len); | |
237 | } | |
238 | } | |
239 | ||
240 | switch (header->type) { | |
241 | case PIM_MSG_TYPE_HELLO: | |
242 | return pim_hello_recv(ifp, ip_hdr->ip_src, | |
243 | pim_msg + PIM_MSG_HEADER_LEN, | |
244 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
245 | break; | |
246 | case PIM_MSG_TYPE_REGISTER: | |
247 | return pim_register_recv(ifp, ip_hdr->ip_dst, ip_hdr->ip_src, | |
248 | pim_msg + PIM_MSG_HEADER_LEN, | |
249 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
250 | break; | |
251 | case PIM_MSG_TYPE_REG_STOP: | |
b206566b | 252 | return pim_register_stop_recv(ifp, pim_msg + PIM_MSG_HEADER_LEN, |
d62a17ae | 253 | pim_msg_len - PIM_MSG_HEADER_LEN); |
254 | break; | |
255 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
256 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
257 | if (!neigh) { | |
258 | if (PIM_DEBUG_PIM_PACKETS) | |
259 | zlog_debug( | |
260 | "%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
261 | __FILE__, __PRETTY_FUNCTION__, | |
262 | header->type, src_str, ifp->name); | |
263 | return -1; | |
264 | } | |
265 | pim_neighbor_timer_reset(neigh, neigh->holdtime); | |
266 | return pim_joinprune_recv(ifp, neigh, ip_hdr->ip_src, | |
267 | pim_msg + PIM_MSG_HEADER_LEN, | |
268 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
269 | break; | |
270 | case PIM_MSG_TYPE_ASSERT: | |
271 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
272 | if (!neigh) { | |
273 | if (PIM_DEBUG_PIM_PACKETS) | |
274 | zlog_debug( | |
275 | "%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
276 | __FILE__, __PRETTY_FUNCTION__, | |
277 | header->type, src_str, ifp->name); | |
278 | return -1; | |
279 | } | |
280 | pim_neighbor_timer_reset(neigh, neigh->holdtime); | |
281 | return pim_assert_recv(ifp, neigh, ip_hdr->ip_src, | |
282 | pim_msg + PIM_MSG_HEADER_LEN, | |
283 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
284 | break; | |
5acde1cf | 285 | case PIM_MSG_TYPE_BOOTSTRAP: |
286 | return pim_bsm_process(ifp, ip_hdr, pim_msg, pim_msg_len, | |
287 | no_fwd); | |
288 | break; | |
d57a8bbf | 289 | |
d62a17ae | 290 | default: |
291 | if (PIM_DEBUG_PIM_PACKETS) { | |
292 | zlog_debug( | |
293 | "Recv PIM packet type %d which is not currently understood", | |
294 | header->type); | |
295 | } | |
296 | return -1; | |
297 | } | |
4dffc880 | 298 | return -1; |
12e41d03 DL |
299 | } |
300 | ||
301 | static void pim_sock_read_on(struct interface *ifp); | |
302 | ||
303 | static int pim_sock_read(struct thread *t) | |
304 | { | |
9487552c | 305 | struct interface *ifp, *orig_ifp; |
d62a17ae | 306 | struct pim_interface *pim_ifp; |
307 | int fd; | |
308 | struct sockaddr_in from; | |
309 | struct sockaddr_in to; | |
310 | socklen_t fromlen = sizeof(from); | |
311 | socklen_t tolen = sizeof(to); | |
312 | uint8_t buf[PIM_PIM_BUFSIZE_READ]; | |
313 | int len; | |
314 | ifindex_t ifindex = -1; | |
315 | int result = -1; /* defaults to bad */ | |
316 | static long long count = 0; | |
317 | int cont = 1; | |
318 | ||
9487552c | 319 | orig_ifp = ifp = THREAD_ARG(t); |
d62a17ae | 320 | fd = THREAD_FD(t); |
321 | ||
322 | pim_ifp = ifp->info; | |
323 | ||
324 | while (cont) { | |
325 | len = pim_socket_recvfromto(fd, buf, sizeof(buf), &from, | |
326 | &fromlen, &to, &tolen, &ifindex); | |
327 | if (len < 0) { | |
328 | if (errno == EINTR) | |
329 | continue; | |
330 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
331 | break; | |
332 | ||
333 | if (PIM_DEBUG_PIM_PACKETS) | |
334 | zlog_debug("Received errno: %d %s", errno, | |
335 | safe_strerror(errno)); | |
336 | goto done; | |
337 | } | |
12e41d03 | 338 | |
e2d451e2 DS |
339 | /* |
340 | * What? So with vrf's the incoming packet is received | |
341 | * on the vrf interface but recvfromto above returns | |
342 | * the right ifindex, so just use it. We know | |
343 | * it's the right interface because we bind to it | |
344 | */ | |
345 | ifp = if_lookup_by_index(ifindex, pim_ifp->pim->vrf_id); | |
05d8470f | 346 | if (!ifp || !ifp->info) { |
a5b6bd2b DS |
347 | if (PIM_DEBUG_PIM_PACKETS) |
348 | zlog_debug( | |
8cd38306 DS |
349 | "%s: Received incoming pim packet on interface(%s:%d) not yet configured for pim", |
350 | __PRETTY_FUNCTION__, | |
351 | ifp ? ifp->name : "Unknown", ifindex); | |
a5b6bd2b DS |
352 | goto done; |
353 | } | |
d62a17ae | 354 | int fail = pim_pim_packet(ifp, buf, len); |
355 | if (fail) { | |
356 | if (PIM_DEBUG_PIM_PACKETS) | |
357 | zlog_debug("%s: pim_pim_packet() return=%d", | |
358 | __PRETTY_FUNCTION__, fail); | |
359 | goto done; | |
360 | } | |
361 | ||
362 | count++; | |
75373cca | 363 | if (count % router->packet_process == 0) |
d62a17ae | 364 | cont = 0; |
365 | } | |
12e41d03 | 366 | |
d62a17ae | 367 | result = 0; /* good */ |
12e41d03 | 368 | |
d62a17ae | 369 | done: |
9487552c | 370 | pim_sock_read_on(orig_ifp); |
12e41d03 | 371 | |
d62a17ae | 372 | if (result) { |
373 | ++pim_ifp->pim_ifstat_hello_recvfail; | |
374 | } | |
12e41d03 | 375 | |
d62a17ae | 376 | return result; |
12e41d03 DL |
377 | } |
378 | ||
379 | static void pim_sock_read_on(struct interface *ifp) | |
380 | { | |
d62a17ae | 381 | struct pim_interface *pim_ifp; |
12e41d03 | 382 | |
d62a17ae | 383 | zassert(ifp); |
384 | zassert(ifp->info); | |
12e41d03 | 385 | |
d62a17ae | 386 | pim_ifp = ifp->info; |
12e41d03 | 387 | |
d62a17ae | 388 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { |
389 | zlog_debug("Scheduling READ event on PIM socket fd=%d", | |
390 | pim_ifp->pim_sock_fd); | |
391 | } | |
392 | pim_ifp->t_pim_sock_read = NULL; | |
36417fcc DS |
393 | thread_add_read(router->master, pim_sock_read, ifp, |
394 | pim_ifp->pim_sock_fd, &pim_ifp->t_pim_sock_read); | |
12e41d03 DL |
395 | } |
396 | ||
e5dfe687 | 397 | static int pim_sock_open(struct interface *ifp) |
12e41d03 | 398 | { |
d62a17ae | 399 | int fd; |
400 | struct pim_interface *pim_ifp = ifp->info; | |
401 | ||
402 | fd = pim_socket_mcast(IPPROTO_PIM, pim_ifp->primary_address, ifp, | |
403 | 0 /* loop=false */); | |
404 | if (fd < 0) | |
405 | return -1; | |
406 | ||
407 | if (pim_socket_join(fd, qpim_all_pim_routers_addr, | |
408 | pim_ifp->primary_address, ifp->ifindex)) { | |
409 | close(fd); | |
410 | return -2; | |
411 | } | |
12e41d03 | 412 | |
d62a17ae | 413 | return fd; |
12e41d03 DL |
414 | } |
415 | ||
416 | void pim_ifstat_reset(struct interface *ifp) | |
417 | { | |
d62a17ae | 418 | struct pim_interface *pim_ifp; |
12e41d03 | 419 | |
d62a17ae | 420 | zassert(ifp); |
12e41d03 | 421 | |
d62a17ae | 422 | pim_ifp = ifp->info; |
423 | if (!pim_ifp) { | |
424 | return; | |
425 | } | |
12e41d03 | 426 | |
d62a17ae | 427 | pim_ifp->pim_ifstat_start = pim_time_monotonic_sec(); |
428 | pim_ifp->pim_ifstat_hello_sent = 0; | |
429 | pim_ifp->pim_ifstat_hello_sendfail = 0; | |
430 | pim_ifp->pim_ifstat_hello_recv = 0; | |
431 | pim_ifp->pim_ifstat_hello_recvfail = 0; | |
12e41d03 DL |
432 | } |
433 | ||
434 | void pim_sock_reset(struct interface *ifp) | |
435 | { | |
d62a17ae | 436 | struct pim_interface *pim_ifp; |
437 | ||
438 | zassert(ifp); | |
439 | zassert(ifp->info); | |
440 | ||
441 | pim_ifp = ifp->info; | |
442 | ||
443 | pim_ifp->primary_address = pim_find_primary_addr(ifp); | |
444 | ||
445 | pim_ifp->pim_sock_fd = -1; | |
446 | pim_ifp->pim_sock_creation = 0; | |
447 | pim_ifp->t_pim_sock_read = NULL; | |
448 | ||
449 | pim_ifp->t_pim_hello_timer = NULL; | |
450 | pim_ifp->pim_hello_period = PIM_DEFAULT_HELLO_PERIOD; | |
451 | pim_ifp->pim_default_holdtime = | |
452 | -1; /* unset: means 3.5 * pim_hello_period */ | |
453 | pim_ifp->pim_triggered_hello_delay = PIM_DEFAULT_TRIGGERED_HELLO_DELAY; | |
454 | pim_ifp->pim_dr_priority = PIM_DEFAULT_DR_PRIORITY; | |
455 | pim_ifp->pim_propagation_delay_msec = | |
456 | PIM_DEFAULT_PROPAGATION_DELAY_MSEC; | |
457 | pim_ifp->pim_override_interval_msec = | |
458 | PIM_DEFAULT_OVERRIDE_INTERVAL_MSEC; | |
459 | if (PIM_DEFAULT_CAN_DISABLE_JOIN_SUPPRESSION) { | |
460 | PIM_IF_DO_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
461 | } else { | |
462 | PIM_IF_DONT_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
463 | } | |
464 | ||
465 | /* neighbors without lan_delay */ | |
466 | pim_ifp->pim_number_of_nonlandelay_neighbors = 0; | |
467 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = 0; | |
468 | pim_ifp->pim_neighbors_highest_override_interval_msec = 0; | |
469 | ||
470 | /* DR Election */ | |
471 | pim_ifp->pim_dr_election_last = 0; /* timestamp */ | |
472 | pim_ifp->pim_dr_election_count = 0; | |
473 | pim_ifp->pim_dr_election_changes = 0; | |
474 | pim_ifp->pim_dr_num_nondrpri_neighbors = | |
475 | 0; /* neighbors without dr_pri */ | |
476 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
477 | ||
478 | pim_ifstat_reset(ifp); | |
12e41d03 DL |
479 | } |
480 | ||
4df01a4e DS |
481 | static uint16_t ip_id = 0; |
482 | ||
c305ed63 | 483 | |
d62a17ae | 484 | static int pim_msg_send_frame(int fd, char *buf, size_t len, |
485 | struct sockaddr *dst, size_t salen) | |
c305ed63 | 486 | { |
d62a17ae | 487 | struct ip *ip = (struct ip *)buf; |
488 | ||
489 | while (sendto(fd, buf, len, MSG_DONTWAIT, dst, salen) < 0) { | |
490 | char dst_str[INET_ADDRSTRLEN]; | |
491 | ||
492 | switch (errno) { | |
493 | case EMSGSIZE: { | |
494 | size_t hdrsize = sizeof(struct ip); | |
495 | size_t newlen1 = ((len - hdrsize) / 2) & 0xFFF8; | |
496 | size_t sendlen = newlen1 + hdrsize; | |
497 | size_t offset = ntohs(ip->ip_off); | |
498 | ||
499 | ip->ip_len = htons(sendlen); | |
500 | ip->ip_off = htons(offset | IP_MF); | |
501 | if (pim_msg_send_frame(fd, buf, sendlen, dst, salen) | |
502 | == 0) { | |
503 | struct ip *ip2 = (struct ip *)(buf + newlen1); | |
504 | size_t newlen2 = len - sendlen; | |
505 | sendlen = newlen2 + hdrsize; | |
506 | ||
507 | memcpy(ip2, ip, hdrsize); | |
508 | ip2->ip_len = htons(sendlen); | |
509 | ip2->ip_off = htons(offset + (newlen1 >> 3)); | |
510 | return pim_msg_send_frame(fd, (char *)ip2, | |
511 | sendlen, dst, salen); | |
512 | } | |
513 | } | |
514 | ||
515 | return -1; | |
516 | break; | |
517 | default: | |
518 | if (PIM_DEBUG_PIM_PACKETS) { | |
519 | pim_inet4_dump("<dst?>", ip->ip_dst, dst_str, | |
520 | sizeof(dst_str)); | |
521 | zlog_warn( | |
522 | "%s: sendto() failure to %s: fd=%d msg_size=%zd: errno=%d: %s", | |
523 | __PRETTY_FUNCTION__, dst_str, fd, len, | |
524 | errno, safe_strerror(errno)); | |
525 | } | |
526 | return -1; | |
527 | break; | |
528 | } | |
c305ed63 | 529 | } |
c305ed63 | 530 | |
d62a17ae | 531 | return 0; |
c305ed63 DS |
532 | } |
533 | ||
d62a17ae | 534 | int pim_msg_send(int fd, struct in_addr src, struct in_addr dst, |
535 | uint8_t *pim_msg, int pim_msg_size, const char *ifname) | |
12e41d03 | 536 | { |
d62a17ae | 537 | struct sockaddr_in to; |
538 | socklen_t tolen; | |
539 | unsigned char buffer[10000]; | |
540 | unsigned char *msg_start; | |
a2b6e694 | 541 | uint8_t ttl; |
d62a17ae | 542 | struct pim_msg_header *header; |
543 | struct ip *ip; | |
544 | ||
545 | memset(buffer, 0, 10000); | |
546 | int sendlen = sizeof(struct ip) + pim_msg_size; | |
547 | ||
548 | msg_start = buffer + sizeof(struct ip); | |
549 | memcpy(msg_start, pim_msg, pim_msg_size); | |
550 | ||
551 | header = (struct pim_msg_header *)pim_msg; | |
552 | /* | |
553 | * Omnios apparently doesn't have a #define for IP default | |
554 | * ttl that is the same as all other platforms. | |
555 | */ | |
05ea5cee DS |
556 | #ifndef IPDEFTTL |
557 | #define IPDEFTTL 64 | |
558 | #endif | |
d62a17ae | 559 | /* TTL for packets destine to ALL-PIM-ROUTERS is 1 */ |
560 | switch (header->type) { | |
561 | case PIM_MSG_TYPE_HELLO: | |
562 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
563 | case PIM_MSG_TYPE_BOOTSTRAP: | |
564 | case PIM_MSG_TYPE_ASSERT: | |
565 | ttl = 1; | |
566 | break; | |
567 | case PIM_MSG_TYPE_REGISTER: | |
568 | case PIM_MSG_TYPE_REG_STOP: | |
569 | case PIM_MSG_TYPE_GRAFT: | |
570 | case PIM_MSG_TYPE_GRAFT_ACK: | |
571 | case PIM_MSG_TYPE_CANDIDATE: | |
572 | ttl = IPDEFTTL; | |
573 | break; | |
574 | default: | |
575 | ttl = MAXTTL; | |
576 | break; | |
577 | } | |
578 | ||
579 | ip = (struct ip *)buffer; | |
580 | ip->ip_id = htons(++ip_id); | |
581 | ip->ip_hl = 5; | |
582 | ip->ip_v = 4; | |
9036d0ef | 583 | ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; |
d62a17ae | 584 | ip->ip_p = PIM_IP_PROTO_PIM; |
585 | ip->ip_src = src; | |
586 | ip->ip_dst = dst; | |
587 | ip->ip_ttl = ttl; | |
588 | ip->ip_len = htons(sendlen); | |
589 | ||
590 | if (PIM_DEBUG_PIM_PACKETS) { | |
d62a17ae | 591 | char dst_str[INET_ADDRSTRLEN]; |
592 | pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str)); | |
593 | zlog_debug("%s: to %s on %s: msg_size=%d checksum=%x", | |
594 | __PRETTY_FUNCTION__, dst_str, ifname, pim_msg_size, | |
595 | header->checksum); | |
596 | } | |
597 | ||
598 | memset(&to, 0, sizeof(to)); | |
599 | to.sin_family = AF_INET; | |
600 | to.sin_addr = dst; | |
601 | tolen = sizeof(to); | |
602 | ||
603 | if (PIM_DEBUG_PIM_PACKETDUMP_SEND) { | |
604 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_size); | |
605 | } | |
606 | ||
607 | pim_msg_send_frame(fd, (char *)buffer, sendlen, (struct sockaddr *)&to, | |
608 | tolen); | |
609 | return 0; | |
12e41d03 DL |
610 | } |
611 | ||
d62a17ae | 612 | static int hello_send(struct interface *ifp, uint16_t holdtime) |
12e41d03 | 613 | { |
d62a17ae | 614 | uint8_t pim_msg[PIM_PIM_BUFSIZE_WRITE]; |
615 | struct pim_interface *pim_ifp; | |
616 | int pim_tlv_size; | |
617 | int pim_msg_size; | |
618 | ||
619 | pim_ifp = ifp->info; | |
620 | ||
621 | if (PIM_DEBUG_PIM_HELLO) { | |
622 | char dst_str[INET_ADDRSTRLEN]; | |
623 | pim_inet4_dump("<dst?>", qpim_all_pim_routers_addr, dst_str, | |
624 | sizeof(dst_str)); | |
625 | zlog_debug( | |
626 | "%s: to %s on %s: holdt=%u prop_d=%u overr_i=%u dis_join_supp=%d dr_prio=%u gen_id=%08x addrs=%d", | |
627 | __PRETTY_FUNCTION__, dst_str, ifp->name, holdtime, | |
628 | pim_ifp->pim_propagation_delay_msec, | |
629 | pim_ifp->pim_override_interval_msec, | |
630 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION( | |
631 | pim_ifp->options), | |
632 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
633 | listcount(ifp->connected)); | |
634 | } | |
635 | ||
636 | pim_tlv_size = pim_hello_build_tlv( | |
637 | ifp, pim_msg + PIM_PIM_MIN_LEN, | |
638 | sizeof(pim_msg) - PIM_PIM_MIN_LEN, holdtime, | |
639 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
640 | pim_ifp->pim_propagation_delay_msec, | |
641 | pim_ifp->pim_override_interval_msec, | |
642 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options)); | |
643 | if (pim_tlv_size < 0) { | |
644 | return -1; | |
645 | } | |
646 | ||
647 | pim_msg_size = pim_tlv_size + PIM_PIM_MIN_LEN; | |
648 | ||
649 | zassert(pim_msg_size >= PIM_PIM_MIN_LEN); | |
650 | zassert(pim_msg_size <= PIM_PIM_BUFSIZE_WRITE); | |
651 | ||
d57a8bbf | 652 | pim_msg_build_header(pim_msg, pim_msg_size, PIM_MSG_TYPE_HELLO, false); |
d62a17ae | 653 | |
654 | if (pim_msg_send(pim_ifp->pim_sock_fd, pim_ifp->primary_address, | |
655 | qpim_all_pim_routers_addr, pim_msg, pim_msg_size, | |
656 | ifp->name)) { | |
657 | if (PIM_DEBUG_PIM_HELLO) { | |
658 | zlog_debug( | |
659 | "%s: could not send PIM message on interface %s", | |
660 | __PRETTY_FUNCTION__, ifp->name); | |
661 | } | |
662 | return -2; | |
663 | } | |
664 | ||
665 | return 0; | |
12e41d03 DL |
666 | } |
667 | ||
d62a17ae | 668 | static int pim_hello_send(struct interface *ifp, uint16_t holdtime) |
12e41d03 | 669 | { |
11699c47 | 670 | struct pim_interface *pim_ifp = ifp->info; |
12e41d03 | 671 | |
fec4ca19 | 672 | if (if_is_loopback_or_vrf(ifp)) |
d62a17ae | 673 | return 0; |
85b62aea | 674 | |
d62a17ae | 675 | if (hello_send(ifp, holdtime)) { |
676 | ++pim_ifp->pim_ifstat_hello_sendfail; | |
12e41d03 | 677 | |
d62a17ae | 678 | if (PIM_DEBUG_PIM_HELLO) { |
679 | zlog_warn("Could not send PIM hello on interface %s", | |
680 | ifp->name); | |
681 | } | |
682 | return -1; | |
683 | } | |
12e41d03 | 684 | |
d62a17ae | 685 | ++pim_ifp->pim_ifstat_hello_sent; |
12e41d03 | 686 | |
d62a17ae | 687 | return 0; |
12e41d03 DL |
688 | } |
689 | ||
690 | static void hello_resched(struct interface *ifp) | |
691 | { | |
d62a17ae | 692 | struct pim_interface *pim_ifp; |
693 | ||
d62a17ae | 694 | pim_ifp = ifp->info; |
d62a17ae | 695 | |
696 | if (PIM_DEBUG_PIM_HELLO) { | |
697 | zlog_debug("Rescheduling %d sec hello on interface %s", | |
698 | pim_ifp->pim_hello_period, ifp->name); | |
699 | } | |
700 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
36417fcc | 701 | thread_add_timer(router->master, on_pim_hello_send, ifp, |
d62a17ae | 702 | pim_ifp->pim_hello_period, |
703 | &pim_ifp->t_pim_hello_timer); | |
12e41d03 DL |
704 | } |
705 | ||
706 | /* | |
707 | Periodic hello timer | |
708 | */ | |
709 | static int on_pim_hello_send(struct thread *t) | |
710 | { | |
d62a17ae | 711 | struct pim_interface *pim_ifp; |
712 | struct interface *ifp; | |
12e41d03 | 713 | |
d62a17ae | 714 | ifp = THREAD_ARG(t); |
d62a17ae | 715 | pim_ifp = ifp->info; |
12e41d03 | 716 | |
d62a17ae | 717 | /* |
718 | * Schedule next hello | |
719 | */ | |
720 | hello_resched(ifp); | |
12e41d03 | 721 | |
d62a17ae | 722 | /* |
723 | * Send hello | |
724 | */ | |
725 | return pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
12e41d03 DL |
726 | } |
727 | ||
728 | /* | |
729 | RFC 4601: 4.3.1. Sending Hello Messages | |
730 | ||
731 | Thus, if a router needs to send a Join/Prune or Assert message on an | |
732 | interface on which it has not yet sent a Hello message with the | |
733 | currently configured IP address, then it MUST immediately send the | |
734 | relevant Hello message without waiting for the Hello Timer to | |
735 | expire, followed by the Join/Prune or Assert message. | |
736 | */ | |
737 | void pim_hello_restart_now(struct interface *ifp) | |
738 | { | |
d62a17ae | 739 | struct pim_interface *pim_ifp; |
12e41d03 | 740 | |
d62a17ae | 741 | pim_ifp = ifp->info; |
12e41d03 | 742 | |
d62a17ae | 743 | /* |
744 | * Reset next hello timer | |
745 | */ | |
746 | hello_resched(ifp); | |
12e41d03 | 747 | |
d62a17ae | 748 | /* |
749 | * Immediately send hello | |
750 | */ | |
751 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
12e41d03 DL |
752 | } |
753 | ||
754 | /* | |
755 | RFC 4601: 4.3.1. Sending Hello Messages | |
756 | ||
757 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
758 | when a Hello message is received from a new neighbor, or a Hello | |
759 | message with a new GenID is received from an existing neighbor, a | |
760 | new Hello message should be sent on this interface after a | |
761 | randomized delay between 0 and Triggered_Hello_Delay. | |
762 | */ | |
763 | void pim_hello_restart_triggered(struct interface *ifp) | |
764 | { | |
d62a17ae | 765 | struct pim_interface *pim_ifp; |
766 | int triggered_hello_delay_msec; | |
767 | int random_msec; | |
768 | ||
d62a17ae | 769 | pim_ifp = ifp->info; |
2aa1ca84 DS |
770 | |
771 | /* | |
772 | * No need to ever start loopback or vrf device hello's | |
773 | */ | |
fec4ca19 | 774 | if (if_is_loopback_or_vrf(ifp)) |
2aa1ca84 | 775 | return; |
d62a17ae | 776 | |
777 | /* | |
778 | * There exists situations where we have the a RPF out this | |
779 | * interface, but we haven't formed a neighbor yet. This | |
780 | * happens especially during interface flaps. While | |
781 | * we would like to handle this more gracefully in other | |
782 | * parts of the code. In order to get us up and running | |
783 | * let's just send the hello immediate'ish | |
784 | * This should be revisited when we get nexthop tracking | |
785 | * in and when we have a better handle on safely | |
786 | * handling the rpf information for upstreams that | |
787 | * we cannot legally reach yet. | |
788 | */ | |
789 | triggered_hello_delay_msec = 1; | |
790 | // triggered_hello_delay_msec = 1000 * | |
791 | // pim_ifp->pim_triggered_hello_delay; | |
792 | ||
793 | if (pim_ifp->t_pim_hello_timer) { | |
794 | long remain_msec = | |
795 | pim_time_timer_remain_msec(pim_ifp->t_pim_hello_timer); | |
796 | if (remain_msec <= triggered_hello_delay_msec) { | |
797 | /* Rescheduling hello would increase the delay, then | |
798 | it's faster | |
799 | to just wait for the scheduled periodic hello. */ | |
800 | return; | |
801 | } | |
802 | ||
803 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
804 | } | |
805 | ||
806 | random_msec = triggered_hello_delay_msec; | |
807 | // random_msec = random() % (triggered_hello_delay_msec + 1); | |
808 | ||
809 | if (PIM_DEBUG_PIM_HELLO) { | |
810 | zlog_debug("Scheduling %d msec triggered hello on interface %s", | |
811 | random_msec, ifp->name); | |
812 | } | |
813 | ||
36417fcc DS |
814 | thread_add_timer_msec(router->master, on_pim_hello_send, ifp, |
815 | random_msec, &pim_ifp->t_pim_hello_timer); | |
12e41d03 DL |
816 | } |
817 | ||
818 | int pim_sock_add(struct interface *ifp) | |
819 | { | |
d62a17ae | 820 | struct pim_interface *pim_ifp; |
821 | uint32_t old_genid; | |
822 | ||
823 | pim_ifp = ifp->info; | |
824 | zassert(pim_ifp); | |
825 | ||
826 | if (pim_ifp->pim_sock_fd >= 0) { | |
827 | if (PIM_DEBUG_PIM_PACKETS) | |
828 | zlog_debug( | |
829 | "Can't recreate existing PIM socket fd=%d for interface %s", | |
830 | pim_ifp->pim_sock_fd, ifp->name); | |
831 | return -1; | |
832 | } | |
833 | ||
834 | pim_ifp->pim_sock_fd = pim_sock_open(ifp); | |
835 | if (pim_ifp->pim_sock_fd < 0) { | |
836 | if (PIM_DEBUG_PIM_PACKETS) | |
837 | zlog_debug("Could not open PIM socket on interface %s", | |
838 | ifp->name); | |
839 | return -2; | |
840 | } | |
841 | ||
842 | pim_socket_ip_hdr(pim_ifp->pim_sock_fd); | |
843 | ||
844 | pim_ifp->t_pim_sock_read = NULL; | |
845 | pim_ifp->pim_sock_creation = pim_time_monotonic_sec(); | |
846 | ||
847 | /* | |
848 | * Just ensure that the new generation id | |
849 | * actually chooses something different. | |
850 | * Actually ran across a case where this | |
851 | * happened, pre-switch to random(). | |
852 | * While this is unlikely to happen now | |
853 | * let's make sure it doesn't. | |
854 | */ | |
855 | old_genid = pim_ifp->pim_generation_id; | |
856 | ||
857 | while (old_genid == pim_ifp->pim_generation_id) | |
858 | pim_ifp->pim_generation_id = random(); | |
859 | ||
860 | zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d", ifp->name, | |
861 | ifp->ifindex); | |
862 | ||
863 | /* | |
864 | * Start receiving PIM messages | |
865 | */ | |
866 | pim_sock_read_on(ifp); | |
867 | ||
868 | /* | |
869 | * Start sending PIM hello's | |
870 | */ | |
871 | pim_hello_restart_triggered(ifp); | |
872 | ||
873 | return 0; | |
12e41d03 | 874 | } |