]>
Commit | Line | Data |
---|---|---|
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); | |
12e41d03 | 45 | |
d62a17ae | 46 | static const char *pim_pim_msgtype2str(enum pim_msg_type type) |
7643f0a1 | 47 | { |
d62a17ae | 48 | switch (type) { |
49 | case PIM_MSG_TYPE_HELLO: | |
50 | return "HELLO"; | |
51 | case PIM_MSG_TYPE_REGISTER: | |
52 | return "REGISTER"; | |
53 | case PIM_MSG_TYPE_REG_STOP: | |
54 | return "REGSTOP"; | |
55 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
56 | return "JOINPRUNE"; | |
57 | case PIM_MSG_TYPE_BOOTSTRAP: | |
58 | return "BOOT"; | |
59 | case PIM_MSG_TYPE_ASSERT: | |
60 | return "ASSERT"; | |
61 | case PIM_MSG_TYPE_GRAFT: | |
62 | return "GRAFT"; | |
63 | case PIM_MSG_TYPE_GRAFT_ACK: | |
64 | return "GACK"; | |
65 | case PIM_MSG_TYPE_CANDIDATE: | |
66 | return "CANDIDATE"; | |
67 | } | |
68 | ||
69 | return "UNKNOWN"; | |
7643f0a1 DS |
70 | } |
71 | ||
12e41d03 DL |
72 | static void sock_close(struct interface *ifp) |
73 | { | |
d62a17ae | 74 | struct pim_interface *pim_ifp = ifp->info; |
75 | ||
76 | if (PIM_DEBUG_PIM_TRACE) { | |
77 | if (pim_ifp->t_pim_sock_read) { | |
78 | zlog_debug( | |
79 | "Cancelling READ event for PIM socket fd=%d on interface %s", | |
80 | pim_ifp->pim_sock_fd, ifp->name); | |
81 | } | |
82 | } | |
83 | THREAD_OFF(pim_ifp->t_pim_sock_read); | |
84 | ||
85 | if (PIM_DEBUG_PIM_TRACE) { | |
86 | if (pim_ifp->t_pim_hello_timer) { | |
87 | zlog_debug( | |
88 | "Cancelling PIM hello timer for interface %s", | |
89 | ifp->name); | |
90 | } | |
91 | } | |
92 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
93 | ||
94 | if (PIM_DEBUG_PIM_TRACE) { | |
95 | zlog_debug("Deleting PIM socket fd=%d on interface %s", | |
96 | pim_ifp->pim_sock_fd, ifp->name); | |
97 | } | |
98 | ||
99 | /* | |
100 | * If the fd is already deleted no need to do anything here | |
101 | */ | |
102 | if (pim_ifp->pim_sock_fd > 0 && close(pim_ifp->pim_sock_fd)) { | |
103 | zlog_warn( | |
104 | "Failure closing PIM socket fd=%d on interface %s: errno=%d: %s", | |
105 | pim_ifp->pim_sock_fd, ifp->name, errno, | |
106 | safe_strerror(errno)); | |
107 | } | |
108 | ||
109 | pim_ifp->pim_sock_fd = -1; | |
110 | pim_ifp->pim_sock_creation = 0; | |
12e41d03 DL |
111 | } |
112 | ||
113 | void pim_sock_delete(struct interface *ifp, const char *delete_message) | |
114 | { | |
d62a17ae | 115 | zlog_info("PIM INTERFACE DOWN: on interface %s: %s", ifp->name, |
116 | delete_message); | |
117 | ||
118 | if (!ifp->info) { | |
298004a1 | 119 | flog_err(EC_PIM_CONFIG, |
1c50c1c0 | 120 | "%s: %s: but PIM not enabled on interface %s (!)", |
15569c58 | 121 | __func__, delete_message, ifp->name); |
d62a17ae | 122 | return; |
123 | } | |
124 | ||
125 | /* | |
126 | RFC 4601: 4.3.1. Sending Hello Messages | |
127 | ||
128 | Before an interface goes down or changes primary IP address, a Hello | |
129 | message with a zero HoldTime should be sent immediately (with the | |
130 | old IP address if the IP address changed). | |
131 | */ | |
132 | pim_hello_send(ifp, 0 /* zero-sec holdtime */); | |
133 | ||
134 | pim_neighbor_delete_all(ifp, delete_message); | |
135 | ||
136 | sock_close(ifp); | |
12e41d03 DL |
137 | } |
138 | ||
23a2f90a | 139 | /* For now check dst address for hello, assrt and join/prune is all pim rtr */ |
140 | static bool pim_pkt_dst_addr_ok(enum pim_msg_type type, in_addr_t addr) | |
141 | { | |
142 | if ((type == PIM_MSG_TYPE_HELLO) || (type == PIM_MSG_TYPE_ASSERT) | |
143 | || (type == PIM_MSG_TYPE_JOIN_PRUNE)) { | |
144 | if (addr != qpim_all_pim_routers_addr.s_addr) | |
145 | return false; | |
146 | } | |
147 | ||
148 | return true; | |
149 | } | |
150 | ||
12e41d03 DL |
151 | int pim_pim_packet(struct interface *ifp, uint8_t *buf, size_t len) |
152 | { | |
d62a17ae | 153 | struct ip *ip_hdr; |
154 | size_t ip_hlen; /* ip header length in bytes */ | |
155 | char src_str[INET_ADDRSTRLEN]; | |
156 | char dst_str[INET_ADDRSTRLEN]; | |
157 | uint8_t *pim_msg; | |
158 | int pim_msg_len; | |
159 | uint16_t pim_checksum; /* received checksum */ | |
160 | uint16_t checksum; /* computed checksum */ | |
161 | struct pim_neighbor *neigh; | |
162 | struct pim_msg_header *header; | |
5acde1cf | 163 | bool no_fwd; |
d62a17ae | 164 | |
165 | if (len < sizeof(*ip_hdr)) { | |
166 | if (PIM_DEBUG_PIM_PACKETS) | |
167 | zlog_debug( | |
168 | "PIM packet size=%zu shorter than minimum=%zu", | |
169 | len, sizeof(*ip_hdr)); | |
170 | return -1; | |
171 | } | |
172 | ||
173 | ip_hdr = (struct ip *)buf; | |
174 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
175 | ||
176 | pim_msg = buf + ip_hlen; | |
177 | pim_msg_len = len - ip_hlen; | |
178 | ||
179 | header = (struct pim_msg_header *)pim_msg; | |
180 | if (pim_msg_len < PIM_PIM_MIN_LEN) { | |
181 | if (PIM_DEBUG_PIM_PACKETS) | |
182 | zlog_debug( | |
183 | "PIM message size=%d shorter than minimum=%d", | |
184 | pim_msg_len, PIM_PIM_MIN_LEN); | |
185 | return -1; | |
186 | } | |
187 | ||
188 | if (header->ver != PIM_PROTO_VERSION) { | |
189 | if (PIM_DEBUG_PIM_PACKETS) | |
190 | zlog_debug( | |
191 | "Ignoring PIM pkt from %s with unsupported version: %d", | |
192 | ifp->name, header->ver); | |
193 | return -1; | |
194 | } | |
195 | ||
196 | /* save received checksum */ | |
197 | pim_checksum = header->checksum; | |
198 | ||
199 | /* for computing checksum */ | |
200 | header->checksum = 0; | |
5acde1cf | 201 | no_fwd = header->Nbit; |
d62a17ae | 202 | |
203 | if (header->type == PIM_MSG_TYPE_REGISTER) { | |
06424db4 DS |
204 | if (pim_msg_len < PIM_MSG_REGISTER_LEN) { |
205 | if (PIM_DEBUG_PIM_PACKETS) | |
206 | zlog_debug("PIM Register Message size=%d shorther than min length %d", | |
207 | pim_msg_len, PIM_MSG_REGISTER_LEN); | |
208 | return -1; | |
209 | } | |
d62a17ae | 210 | /* First 8 byte header checksum */ |
211 | checksum = in_cksum(pim_msg, PIM_MSG_REGISTER_LEN); | |
212 | if (checksum != pim_checksum) { | |
213 | checksum = in_cksum(pim_msg, pim_msg_len); | |
214 | if (checksum != pim_checksum) { | |
215 | if (PIM_DEBUG_PIM_PACKETS) | |
216 | zlog_debug( | |
217 | "Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
218 | ifp->name, pim_checksum, | |
219 | checksum); | |
220 | ||
221 | return -1; | |
222 | } | |
223 | } | |
224 | } else { | |
225 | checksum = in_cksum(pim_msg, pim_msg_len); | |
226 | if (checksum != pim_checksum) { | |
227 | if (PIM_DEBUG_PIM_PACKETS) | |
228 | zlog_debug( | |
229 | "Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
230 | ifp->name, pim_checksum, checksum); | |
231 | ||
232 | return -1; | |
233 | } | |
234 | } | |
235 | ||
236 | if (PIM_DEBUG_PIM_PACKETS) { | |
237 | pim_inet4_dump("<src?>", ip_hdr->ip_src, src_str, | |
238 | sizeof(src_str)); | |
239 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, dst_str, | |
240 | sizeof(dst_str)); | |
241 | zlog_debug( | |
242 | "Recv PIM %s packet from %s to %s on %s: ttl=%d pim_version=%d pim_msg_size=%d checksum=%x", | |
243 | pim_pim_msgtype2str(header->type), src_str, dst_str, | |
244 | ifp->name, ip_hdr->ip_ttl, header->ver, pim_msg_len, | |
245 | checksum); | |
246 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) { | |
15569c58 | 247 | pim_pkt_dump(__func__, pim_msg, pim_msg_len); |
d62a17ae | 248 | } |
249 | } | |
250 | ||
23a2f90a | 251 | if (!pim_pkt_dst_addr_ok(header->type, ip_hdr->ip_dst.s_addr)) { |
252 | char dst_str[INET_ADDRSTRLEN]; | |
253 | char src_str[INET_ADDRSTRLEN]; | |
254 | ||
255 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, dst_str, | |
256 | sizeof(dst_str)); | |
257 | pim_inet4_dump("<src?>", ip_hdr->ip_src, src_str, | |
258 | sizeof(src_str)); | |
259 | zlog_warn( | |
260 | "%s: Ignoring Pkt. Unexpected IP destination %s for %s (Expected: all_pim_routers_addr) from %s", | |
261 | __func__, dst_str, pim_pim_msgtype2str(header->type), | |
262 | src_str); | |
263 | return -1; | |
264 | } | |
265 | ||
d62a17ae | 266 | switch (header->type) { |
267 | case PIM_MSG_TYPE_HELLO: | |
268 | return pim_hello_recv(ifp, ip_hdr->ip_src, | |
269 | pim_msg + PIM_MSG_HEADER_LEN, | |
270 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
271 | break; | |
272 | case PIM_MSG_TYPE_REGISTER: | |
273 | return pim_register_recv(ifp, ip_hdr->ip_dst, ip_hdr->ip_src, | |
274 | pim_msg + PIM_MSG_HEADER_LEN, | |
275 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
276 | break; | |
277 | case PIM_MSG_TYPE_REG_STOP: | |
b206566b | 278 | return pim_register_stop_recv(ifp, pim_msg + PIM_MSG_HEADER_LEN, |
d62a17ae | 279 | pim_msg_len - PIM_MSG_HEADER_LEN); |
280 | break; | |
281 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
282 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
283 | if (!neigh) { | |
284 | if (PIM_DEBUG_PIM_PACKETS) | |
285 | zlog_debug( | |
286 | "%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
15569c58 DA |
287 | __FILE__, __func__, header->type, |
288 | src_str, ifp->name); | |
d62a17ae | 289 | return -1; |
290 | } | |
291 | pim_neighbor_timer_reset(neigh, neigh->holdtime); | |
292 | return pim_joinprune_recv(ifp, neigh, ip_hdr->ip_src, | |
293 | pim_msg + PIM_MSG_HEADER_LEN, | |
294 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
295 | break; | |
296 | case PIM_MSG_TYPE_ASSERT: | |
297 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
298 | if (!neigh) { | |
299 | if (PIM_DEBUG_PIM_PACKETS) | |
300 | zlog_debug( | |
301 | "%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
15569c58 DA |
302 | __FILE__, __func__, header->type, |
303 | src_str, ifp->name); | |
d62a17ae | 304 | return -1; |
305 | } | |
306 | pim_neighbor_timer_reset(neigh, neigh->holdtime); | |
307 | return pim_assert_recv(ifp, neigh, ip_hdr->ip_src, | |
308 | pim_msg + PIM_MSG_HEADER_LEN, | |
309 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
310 | break; | |
5acde1cf | 311 | case PIM_MSG_TYPE_BOOTSTRAP: |
312 | return pim_bsm_process(ifp, ip_hdr, pim_msg, pim_msg_len, | |
313 | no_fwd); | |
314 | break; | |
d57a8bbf | 315 | |
d62a17ae | 316 | default: |
317 | if (PIM_DEBUG_PIM_PACKETS) { | |
318 | zlog_debug( | |
319 | "Recv PIM packet type %d which is not currently understood", | |
320 | header->type); | |
321 | } | |
322 | return -1; | |
323 | } | |
4dffc880 | 324 | return -1; |
12e41d03 DL |
325 | } |
326 | ||
327 | static void pim_sock_read_on(struct interface *ifp); | |
328 | ||
329 | static int pim_sock_read(struct thread *t) | |
330 | { | |
9487552c | 331 | struct interface *ifp, *orig_ifp; |
d62a17ae | 332 | struct pim_interface *pim_ifp; |
333 | int fd; | |
334 | struct sockaddr_in from; | |
335 | struct sockaddr_in to; | |
336 | socklen_t fromlen = sizeof(from); | |
337 | socklen_t tolen = sizeof(to); | |
338 | uint8_t buf[PIM_PIM_BUFSIZE_READ]; | |
339 | int len; | |
340 | ifindex_t ifindex = -1; | |
341 | int result = -1; /* defaults to bad */ | |
342 | static long long count = 0; | |
343 | int cont = 1; | |
344 | ||
9487552c | 345 | orig_ifp = ifp = THREAD_ARG(t); |
d62a17ae | 346 | fd = THREAD_FD(t); |
347 | ||
348 | pim_ifp = ifp->info; | |
349 | ||
350 | while (cont) { | |
351 | len = pim_socket_recvfromto(fd, buf, sizeof(buf), &from, | |
352 | &fromlen, &to, &tolen, &ifindex); | |
353 | if (len < 0) { | |
354 | if (errno == EINTR) | |
355 | continue; | |
356 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
357 | break; | |
358 | ||
359 | if (PIM_DEBUG_PIM_PACKETS) | |
360 | zlog_debug("Received errno: %d %s", errno, | |
361 | safe_strerror(errno)); | |
362 | goto done; | |
363 | } | |
12e41d03 | 364 | |
e2d451e2 DS |
365 | /* |
366 | * What? So with vrf's the incoming packet is received | |
367 | * on the vrf interface but recvfromto above returns | |
368 | * the right ifindex, so just use it. We know | |
369 | * it's the right interface because we bind to it | |
370 | */ | |
371 | ifp = if_lookup_by_index(ifindex, pim_ifp->pim->vrf_id); | |
05d8470f | 372 | if (!ifp || !ifp->info) { |
a5b6bd2b DS |
373 | if (PIM_DEBUG_PIM_PACKETS) |
374 | zlog_debug( | |
8cd38306 | 375 | "%s: Received incoming pim packet on interface(%s:%d) not yet configured for pim", |
15569c58 DA |
376 | __func__, ifp ? ifp->name : "Unknown", |
377 | ifindex); | |
a5b6bd2b DS |
378 | goto done; |
379 | } | |
d62a17ae | 380 | int fail = pim_pim_packet(ifp, buf, len); |
381 | if (fail) { | |
382 | if (PIM_DEBUG_PIM_PACKETS) | |
383 | zlog_debug("%s: pim_pim_packet() return=%d", | |
15569c58 | 384 | __func__, fail); |
d62a17ae | 385 | goto done; |
386 | } | |
387 | ||
388 | count++; | |
75373cca | 389 | if (count % router->packet_process == 0) |
d62a17ae | 390 | cont = 0; |
391 | } | |
12e41d03 | 392 | |
d62a17ae | 393 | result = 0; /* good */ |
12e41d03 | 394 | |
d62a17ae | 395 | done: |
9487552c | 396 | pim_sock_read_on(orig_ifp); |
12e41d03 | 397 | |
d62a17ae | 398 | if (result) { |
399 | ++pim_ifp->pim_ifstat_hello_recvfail; | |
400 | } | |
12e41d03 | 401 | |
d62a17ae | 402 | return result; |
12e41d03 DL |
403 | } |
404 | ||
405 | static void pim_sock_read_on(struct interface *ifp) | |
406 | { | |
d62a17ae | 407 | struct pim_interface *pim_ifp; |
12e41d03 | 408 | |
d62a17ae | 409 | zassert(ifp); |
410 | zassert(ifp->info); | |
12e41d03 | 411 | |
d62a17ae | 412 | pim_ifp = ifp->info; |
12e41d03 | 413 | |
d62a17ae | 414 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { |
415 | zlog_debug("Scheduling READ event on PIM socket fd=%d", | |
416 | pim_ifp->pim_sock_fd); | |
417 | } | |
418 | pim_ifp->t_pim_sock_read = NULL; | |
36417fcc DS |
419 | thread_add_read(router->master, pim_sock_read, ifp, |
420 | pim_ifp->pim_sock_fd, &pim_ifp->t_pim_sock_read); | |
12e41d03 DL |
421 | } |
422 | ||
e5dfe687 | 423 | static int pim_sock_open(struct interface *ifp) |
12e41d03 | 424 | { |
d62a17ae | 425 | int fd; |
426 | struct pim_interface *pim_ifp = ifp->info; | |
427 | ||
428 | fd = pim_socket_mcast(IPPROTO_PIM, pim_ifp->primary_address, ifp, | |
429 | 0 /* loop=false */); | |
430 | if (fd < 0) | |
431 | return -1; | |
432 | ||
433 | if (pim_socket_join(fd, qpim_all_pim_routers_addr, | |
434 | pim_ifp->primary_address, ifp->ifindex)) { | |
435 | close(fd); | |
436 | return -2; | |
437 | } | |
12e41d03 | 438 | |
d62a17ae | 439 | return fd; |
12e41d03 DL |
440 | } |
441 | ||
442 | void pim_ifstat_reset(struct interface *ifp) | |
443 | { | |
d62a17ae | 444 | struct pim_interface *pim_ifp; |
12e41d03 | 445 | |
d62a17ae | 446 | zassert(ifp); |
12e41d03 | 447 | |
d62a17ae | 448 | pim_ifp = ifp->info; |
449 | if (!pim_ifp) { | |
450 | return; | |
451 | } | |
12e41d03 | 452 | |
d62a17ae | 453 | pim_ifp->pim_ifstat_start = pim_time_monotonic_sec(); |
454 | pim_ifp->pim_ifstat_hello_sent = 0; | |
455 | pim_ifp->pim_ifstat_hello_sendfail = 0; | |
456 | pim_ifp->pim_ifstat_hello_recv = 0; | |
457 | pim_ifp->pim_ifstat_hello_recvfail = 0; | |
12e41d03 DL |
458 | } |
459 | ||
460 | void pim_sock_reset(struct interface *ifp) | |
461 | { | |
d62a17ae | 462 | struct pim_interface *pim_ifp; |
463 | ||
464 | zassert(ifp); | |
465 | zassert(ifp->info); | |
466 | ||
467 | pim_ifp = ifp->info; | |
468 | ||
469 | pim_ifp->primary_address = pim_find_primary_addr(ifp); | |
470 | ||
471 | pim_ifp->pim_sock_fd = -1; | |
472 | pim_ifp->pim_sock_creation = 0; | |
473 | pim_ifp->t_pim_sock_read = NULL; | |
474 | ||
475 | pim_ifp->t_pim_hello_timer = NULL; | |
476 | pim_ifp->pim_hello_period = PIM_DEFAULT_HELLO_PERIOD; | |
477 | pim_ifp->pim_default_holdtime = | |
478 | -1; /* unset: means 3.5 * pim_hello_period */ | |
479 | pim_ifp->pim_triggered_hello_delay = PIM_DEFAULT_TRIGGERED_HELLO_DELAY; | |
480 | pim_ifp->pim_dr_priority = PIM_DEFAULT_DR_PRIORITY; | |
481 | pim_ifp->pim_propagation_delay_msec = | |
482 | PIM_DEFAULT_PROPAGATION_DELAY_MSEC; | |
483 | pim_ifp->pim_override_interval_msec = | |
484 | PIM_DEFAULT_OVERRIDE_INTERVAL_MSEC; | |
485 | if (PIM_DEFAULT_CAN_DISABLE_JOIN_SUPPRESSION) { | |
486 | PIM_IF_DO_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
487 | } else { | |
488 | PIM_IF_DONT_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
489 | } | |
490 | ||
491 | /* neighbors without lan_delay */ | |
492 | pim_ifp->pim_number_of_nonlandelay_neighbors = 0; | |
493 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = 0; | |
494 | pim_ifp->pim_neighbors_highest_override_interval_msec = 0; | |
495 | ||
496 | /* DR Election */ | |
497 | pim_ifp->pim_dr_election_last = 0; /* timestamp */ | |
498 | pim_ifp->pim_dr_election_count = 0; | |
499 | pim_ifp->pim_dr_election_changes = 0; | |
500 | pim_ifp->pim_dr_num_nondrpri_neighbors = | |
501 | 0; /* neighbors without dr_pri */ | |
502 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
503 | ||
504 | pim_ifstat_reset(ifp); | |
12e41d03 DL |
505 | } |
506 | ||
4df01a4e DS |
507 | static uint16_t ip_id = 0; |
508 | ||
c305ed63 | 509 | |
d62a17ae | 510 | static int pim_msg_send_frame(int fd, char *buf, size_t len, |
511 | struct sockaddr *dst, size_t salen) | |
c305ed63 | 512 | { |
d62a17ae | 513 | struct ip *ip = (struct ip *)buf; |
514 | ||
515 | while (sendto(fd, buf, len, MSG_DONTWAIT, dst, salen) < 0) { | |
516 | char dst_str[INET_ADDRSTRLEN]; | |
517 | ||
518 | switch (errno) { | |
519 | case EMSGSIZE: { | |
520 | size_t hdrsize = sizeof(struct ip); | |
521 | size_t newlen1 = ((len - hdrsize) / 2) & 0xFFF8; | |
522 | size_t sendlen = newlen1 + hdrsize; | |
523 | size_t offset = ntohs(ip->ip_off); | |
524 | ||
525 | ip->ip_len = htons(sendlen); | |
526 | ip->ip_off = htons(offset | IP_MF); | |
527 | if (pim_msg_send_frame(fd, buf, sendlen, dst, salen) | |
528 | == 0) { | |
529 | struct ip *ip2 = (struct ip *)(buf + newlen1); | |
530 | size_t newlen2 = len - sendlen; | |
531 | sendlen = newlen2 + hdrsize; | |
532 | ||
533 | memcpy(ip2, ip, hdrsize); | |
534 | ip2->ip_len = htons(sendlen); | |
535 | ip2->ip_off = htons(offset + (newlen1 >> 3)); | |
536 | return pim_msg_send_frame(fd, (char *)ip2, | |
537 | sendlen, dst, salen); | |
538 | } | |
539 | } | |
540 | ||
541 | return -1; | |
d62a17ae | 542 | default: |
543 | if (PIM_DEBUG_PIM_PACKETS) { | |
544 | pim_inet4_dump("<dst?>", ip->ip_dst, dst_str, | |
545 | sizeof(dst_str)); | |
546 | zlog_warn( | |
547 | "%s: sendto() failure to %s: fd=%d msg_size=%zd: errno=%d: %s", | |
15569c58 DA |
548 | __func__, dst_str, fd, len, errno, |
549 | safe_strerror(errno)); | |
d62a17ae | 550 | } |
551 | return -1; | |
d62a17ae | 552 | } |
c305ed63 | 553 | } |
c305ed63 | 554 | |
d62a17ae | 555 | return 0; |
c305ed63 DS |
556 | } |
557 | ||
d62a17ae | 558 | int pim_msg_send(int fd, struct in_addr src, struct in_addr dst, |
559 | uint8_t *pim_msg, int pim_msg_size, const char *ifname) | |
12e41d03 | 560 | { |
d62a17ae | 561 | struct sockaddr_in to; |
562 | socklen_t tolen; | |
563 | unsigned char buffer[10000]; | |
564 | unsigned char *msg_start; | |
a2b6e694 | 565 | uint8_t ttl; |
d62a17ae | 566 | struct pim_msg_header *header; |
567 | struct ip *ip; | |
568 | ||
569 | memset(buffer, 0, 10000); | |
570 | int sendlen = sizeof(struct ip) + pim_msg_size; | |
571 | ||
572 | msg_start = buffer + sizeof(struct ip); | |
573 | memcpy(msg_start, pim_msg, pim_msg_size); | |
574 | ||
575 | header = (struct pim_msg_header *)pim_msg; | |
576 | /* | |
577 | * Omnios apparently doesn't have a #define for IP default | |
578 | * ttl that is the same as all other platforms. | |
579 | */ | |
05ea5cee DS |
580 | #ifndef IPDEFTTL |
581 | #define IPDEFTTL 64 | |
582 | #endif | |
d62a17ae | 583 | /* TTL for packets destine to ALL-PIM-ROUTERS is 1 */ |
584 | switch (header->type) { | |
585 | case PIM_MSG_TYPE_HELLO: | |
586 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
587 | case PIM_MSG_TYPE_BOOTSTRAP: | |
588 | case PIM_MSG_TYPE_ASSERT: | |
589 | ttl = 1; | |
590 | break; | |
591 | case PIM_MSG_TYPE_REGISTER: | |
592 | case PIM_MSG_TYPE_REG_STOP: | |
593 | case PIM_MSG_TYPE_GRAFT: | |
594 | case PIM_MSG_TYPE_GRAFT_ACK: | |
595 | case PIM_MSG_TYPE_CANDIDATE: | |
596 | ttl = IPDEFTTL; | |
597 | break; | |
598 | default: | |
599 | ttl = MAXTTL; | |
600 | break; | |
601 | } | |
602 | ||
603 | ip = (struct ip *)buffer; | |
604 | ip->ip_id = htons(++ip_id); | |
605 | ip->ip_hl = 5; | |
606 | ip->ip_v = 4; | |
9036d0ef | 607 | ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; |
d62a17ae | 608 | ip->ip_p = PIM_IP_PROTO_PIM; |
609 | ip->ip_src = src; | |
610 | ip->ip_dst = dst; | |
611 | ip->ip_ttl = ttl; | |
612 | ip->ip_len = htons(sendlen); | |
613 | ||
614 | if (PIM_DEBUG_PIM_PACKETS) { | |
d62a17ae | 615 | char dst_str[INET_ADDRSTRLEN]; |
616 | pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str)); | |
15569c58 DA |
617 | zlog_debug("%s: to %s on %s: msg_size=%d checksum=%x", __func__, |
618 | dst_str, ifname, pim_msg_size, header->checksum); | |
d62a17ae | 619 | } |
620 | ||
621 | memset(&to, 0, sizeof(to)); | |
622 | to.sin_family = AF_INET; | |
623 | to.sin_addr = dst; | |
624 | tolen = sizeof(to); | |
625 | ||
626 | if (PIM_DEBUG_PIM_PACKETDUMP_SEND) { | |
15569c58 | 627 | pim_pkt_dump(__func__, pim_msg, pim_msg_size); |
d62a17ae | 628 | } |
629 | ||
630 | pim_msg_send_frame(fd, (char *)buffer, sendlen, (struct sockaddr *)&to, | |
631 | tolen); | |
632 | return 0; | |
12e41d03 DL |
633 | } |
634 | ||
d62a17ae | 635 | static int hello_send(struct interface *ifp, uint16_t holdtime) |
12e41d03 | 636 | { |
d62a17ae | 637 | uint8_t pim_msg[PIM_PIM_BUFSIZE_WRITE]; |
638 | struct pim_interface *pim_ifp; | |
639 | int pim_tlv_size; | |
640 | int pim_msg_size; | |
641 | ||
642 | pim_ifp = ifp->info; | |
643 | ||
644 | if (PIM_DEBUG_PIM_HELLO) { | |
645 | char dst_str[INET_ADDRSTRLEN]; | |
646 | pim_inet4_dump("<dst?>", qpim_all_pim_routers_addr, dst_str, | |
647 | sizeof(dst_str)); | |
648 | zlog_debug( | |
649 | "%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", | |
15569c58 | 650 | __func__, dst_str, ifp->name, holdtime, |
d62a17ae | 651 | pim_ifp->pim_propagation_delay_msec, |
652 | pim_ifp->pim_override_interval_msec, | |
653 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION( | |
654 | pim_ifp->options), | |
655 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
656 | listcount(ifp->connected)); | |
657 | } | |
658 | ||
659 | pim_tlv_size = pim_hello_build_tlv( | |
660 | ifp, pim_msg + PIM_PIM_MIN_LEN, | |
661 | sizeof(pim_msg) - PIM_PIM_MIN_LEN, holdtime, | |
662 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
663 | pim_ifp->pim_propagation_delay_msec, | |
664 | pim_ifp->pim_override_interval_msec, | |
665 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options)); | |
666 | if (pim_tlv_size < 0) { | |
667 | return -1; | |
668 | } | |
669 | ||
670 | pim_msg_size = pim_tlv_size + PIM_PIM_MIN_LEN; | |
671 | ||
672 | zassert(pim_msg_size >= PIM_PIM_MIN_LEN); | |
673 | zassert(pim_msg_size <= PIM_PIM_BUFSIZE_WRITE); | |
674 | ||
d57a8bbf | 675 | pim_msg_build_header(pim_msg, pim_msg_size, PIM_MSG_TYPE_HELLO, false); |
d62a17ae | 676 | |
677 | if (pim_msg_send(pim_ifp->pim_sock_fd, pim_ifp->primary_address, | |
678 | qpim_all_pim_routers_addr, pim_msg, pim_msg_size, | |
679 | ifp->name)) { | |
680 | if (PIM_DEBUG_PIM_HELLO) { | |
681 | zlog_debug( | |
682 | "%s: could not send PIM message on interface %s", | |
15569c58 | 683 | __func__, ifp->name); |
d62a17ae | 684 | } |
685 | return -2; | |
686 | } | |
687 | ||
688 | return 0; | |
12e41d03 DL |
689 | } |
690 | ||
b279f95c | 691 | int pim_hello_send(struct interface *ifp, uint16_t holdtime) |
12e41d03 | 692 | { |
11699c47 | 693 | struct pim_interface *pim_ifp = ifp->info; |
12e41d03 | 694 | |
fec4ca19 | 695 | if (if_is_loopback_or_vrf(ifp)) |
d62a17ae | 696 | return 0; |
85b62aea | 697 | |
d62a17ae | 698 | if (hello_send(ifp, holdtime)) { |
699 | ++pim_ifp->pim_ifstat_hello_sendfail; | |
12e41d03 | 700 | |
d62a17ae | 701 | if (PIM_DEBUG_PIM_HELLO) { |
702 | zlog_warn("Could not send PIM hello on interface %s", | |
703 | ifp->name); | |
704 | } | |
705 | return -1; | |
706 | } | |
12e41d03 | 707 | |
d62a17ae | 708 | ++pim_ifp->pim_ifstat_hello_sent; |
12e41d03 | 709 | |
d62a17ae | 710 | return 0; |
12e41d03 DL |
711 | } |
712 | ||
713 | static void hello_resched(struct interface *ifp) | |
714 | { | |
d62a17ae | 715 | struct pim_interface *pim_ifp; |
716 | ||
d62a17ae | 717 | pim_ifp = ifp->info; |
d62a17ae | 718 | |
719 | if (PIM_DEBUG_PIM_HELLO) { | |
720 | zlog_debug("Rescheduling %d sec hello on interface %s", | |
721 | pim_ifp->pim_hello_period, ifp->name); | |
722 | } | |
723 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
36417fcc | 724 | thread_add_timer(router->master, on_pim_hello_send, ifp, |
d62a17ae | 725 | pim_ifp->pim_hello_period, |
726 | &pim_ifp->t_pim_hello_timer); | |
12e41d03 DL |
727 | } |
728 | ||
729 | /* | |
730 | Periodic hello timer | |
731 | */ | |
732 | static int on_pim_hello_send(struct thread *t) | |
733 | { | |
d62a17ae | 734 | struct pim_interface *pim_ifp; |
735 | struct interface *ifp; | |
12e41d03 | 736 | |
d62a17ae | 737 | ifp = THREAD_ARG(t); |
d62a17ae | 738 | pim_ifp = ifp->info; |
12e41d03 | 739 | |
d62a17ae | 740 | /* |
741 | * Schedule next hello | |
742 | */ | |
743 | hello_resched(ifp); | |
12e41d03 | 744 | |
d62a17ae | 745 | /* |
746 | * Send hello | |
747 | */ | |
748 | return pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
12e41d03 DL |
749 | } |
750 | ||
751 | /* | |
752 | RFC 4601: 4.3.1. Sending Hello Messages | |
753 | ||
754 | Thus, if a router needs to send a Join/Prune or Assert message on an | |
755 | interface on which it has not yet sent a Hello message with the | |
756 | currently configured IP address, then it MUST immediately send the | |
757 | relevant Hello message without waiting for the Hello Timer to | |
758 | expire, followed by the Join/Prune or Assert message. | |
759 | */ | |
760 | void pim_hello_restart_now(struct interface *ifp) | |
761 | { | |
d62a17ae | 762 | struct pim_interface *pim_ifp; |
12e41d03 | 763 | |
d62a17ae | 764 | pim_ifp = ifp->info; |
12e41d03 | 765 | |
d62a17ae | 766 | /* |
767 | * Reset next hello timer | |
768 | */ | |
769 | hello_resched(ifp); | |
12e41d03 | 770 | |
d62a17ae | 771 | /* |
772 | * Immediately send hello | |
773 | */ | |
774 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
12e41d03 DL |
775 | } |
776 | ||
777 | /* | |
778 | RFC 4601: 4.3.1. Sending Hello Messages | |
779 | ||
780 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
781 | when a Hello message is received from a new neighbor, or a Hello | |
782 | message with a new GenID is received from an existing neighbor, a | |
783 | new Hello message should be sent on this interface after a | |
784 | randomized delay between 0 and Triggered_Hello_Delay. | |
785 | */ | |
786 | void pim_hello_restart_triggered(struct interface *ifp) | |
787 | { | |
d62a17ae | 788 | struct pim_interface *pim_ifp; |
789 | int triggered_hello_delay_msec; | |
790 | int random_msec; | |
791 | ||
d62a17ae | 792 | pim_ifp = ifp->info; |
2aa1ca84 DS |
793 | |
794 | /* | |
795 | * No need to ever start loopback or vrf device hello's | |
796 | */ | |
fec4ca19 | 797 | if (if_is_loopback_or_vrf(ifp)) |
2aa1ca84 | 798 | return; |
d62a17ae | 799 | |
800 | /* | |
801 | * There exists situations where we have the a RPF out this | |
802 | * interface, but we haven't formed a neighbor yet. This | |
803 | * happens especially during interface flaps. While | |
804 | * we would like to handle this more gracefully in other | |
805 | * parts of the code. In order to get us up and running | |
806 | * let's just send the hello immediate'ish | |
807 | * This should be revisited when we get nexthop tracking | |
808 | * in and when we have a better handle on safely | |
809 | * handling the rpf information for upstreams that | |
810 | * we cannot legally reach yet. | |
811 | */ | |
812 | triggered_hello_delay_msec = 1; | |
813 | // triggered_hello_delay_msec = 1000 * | |
814 | // pim_ifp->pim_triggered_hello_delay; | |
815 | ||
816 | if (pim_ifp->t_pim_hello_timer) { | |
817 | long remain_msec = | |
818 | pim_time_timer_remain_msec(pim_ifp->t_pim_hello_timer); | |
819 | if (remain_msec <= triggered_hello_delay_msec) { | |
820 | /* Rescheduling hello would increase the delay, then | |
821 | it's faster | |
822 | to just wait for the scheduled periodic hello. */ | |
823 | return; | |
824 | } | |
825 | ||
826 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
827 | } | |
828 | ||
829 | random_msec = triggered_hello_delay_msec; | |
830 | // random_msec = random() % (triggered_hello_delay_msec + 1); | |
831 | ||
832 | if (PIM_DEBUG_PIM_HELLO) { | |
833 | zlog_debug("Scheduling %d msec triggered hello on interface %s", | |
834 | random_msec, ifp->name); | |
835 | } | |
836 | ||
36417fcc DS |
837 | thread_add_timer_msec(router->master, on_pim_hello_send, ifp, |
838 | random_msec, &pim_ifp->t_pim_hello_timer); | |
12e41d03 DL |
839 | } |
840 | ||
841 | int pim_sock_add(struct interface *ifp) | |
842 | { | |
d62a17ae | 843 | struct pim_interface *pim_ifp; |
844 | uint32_t old_genid; | |
845 | ||
846 | pim_ifp = ifp->info; | |
847 | zassert(pim_ifp); | |
848 | ||
849 | if (pim_ifp->pim_sock_fd >= 0) { | |
850 | if (PIM_DEBUG_PIM_PACKETS) | |
851 | zlog_debug( | |
852 | "Can't recreate existing PIM socket fd=%d for interface %s", | |
853 | pim_ifp->pim_sock_fd, ifp->name); | |
854 | return -1; | |
855 | } | |
856 | ||
857 | pim_ifp->pim_sock_fd = pim_sock_open(ifp); | |
858 | if (pim_ifp->pim_sock_fd < 0) { | |
859 | if (PIM_DEBUG_PIM_PACKETS) | |
860 | zlog_debug("Could not open PIM socket on interface %s", | |
861 | ifp->name); | |
862 | return -2; | |
863 | } | |
864 | ||
865 | pim_socket_ip_hdr(pim_ifp->pim_sock_fd); | |
866 | ||
867 | pim_ifp->t_pim_sock_read = NULL; | |
868 | pim_ifp->pim_sock_creation = pim_time_monotonic_sec(); | |
869 | ||
870 | /* | |
871 | * Just ensure that the new generation id | |
872 | * actually chooses something different. | |
873 | * Actually ran across a case where this | |
874 | * happened, pre-switch to random(). | |
875 | * While this is unlikely to happen now | |
876 | * let's make sure it doesn't. | |
877 | */ | |
878 | old_genid = pim_ifp->pim_generation_id; | |
879 | ||
880 | while (old_genid == pim_ifp->pim_generation_id) | |
881 | pim_ifp->pim_generation_id = random(); | |
882 | ||
883 | zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d", ifp->name, | |
884 | ifp->ifindex); | |
885 | ||
886 | /* | |
887 | * Start receiving PIM messages | |
888 | */ | |
889 | pim_sock_read_on(ifp); | |
890 | ||
891 | /* | |
892 | * Start sending PIM hello's | |
893 | */ | |
894 | pim_hello_restart_triggered(ifp); | |
895 | ||
896 | return 0; | |
12e41d03 | 897 | } |