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12e41d03 DL |
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 | |
16 | along with this program; see the file COPYING; if not, write to the | |
17 | Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
18 | MA 02110-1301 USA | |
19 | ||
20 | $QuaggaId: $Format:%an, %ai, %h$ $ | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "log.h" | |
26 | #include "thread.h" | |
27 | #include "memory.h" | |
744d91b3 | 28 | #include "if.h" |
12e41d03 DL |
29 | |
30 | #include "pimd.h" | |
31 | #include "pim_pim.h" | |
32 | #include "pim_time.h" | |
33 | #include "pim_iface.h" | |
34 | #include "pim_sock.h" | |
35 | #include "pim_str.h" | |
36 | #include "pim_util.h" | |
37 | #include "pim_tlv.h" | |
38 | #include "pim_neighbor.h" | |
39 | #include "pim_hello.h" | |
40 | #include "pim_join.h" | |
41 | #include "pim_assert.h" | |
42 | #include "pim_msg.h" | |
77e390e5 | 43 | #include "pim_register.h" |
12e41d03 DL |
44 | |
45 | static int on_pim_hello_send(struct thread *t); | |
46 | static int pim_hello_send(struct interface *ifp, | |
47 | uint16_t holdtime); | |
48 | ||
49 | static void sock_close(struct interface *ifp) | |
50 | { | |
51 | struct pim_interface *pim_ifp = ifp->info; | |
52 | ||
53 | if (PIM_DEBUG_PIM_TRACE) { | |
54 | if (pim_ifp->t_pim_sock_read) { | |
55 | zlog_debug("Cancelling READ event for PIM socket fd=%d on interface %s", | |
56 | pim_ifp->pim_sock_fd, | |
57 | ifp->name); | |
58 | } | |
59 | } | |
60 | THREAD_OFF(pim_ifp->t_pim_sock_read); | |
61 | ||
62 | if (PIM_DEBUG_PIM_TRACE) { | |
63 | if (pim_ifp->t_pim_hello_timer) { | |
64 | zlog_debug("Cancelling PIM hello timer for interface %s", | |
65 | ifp->name); | |
66 | } | |
67 | } | |
68 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
69 | ||
70 | if (PIM_DEBUG_PIM_TRACE) { | |
71 | zlog_debug("Deleting PIM socket fd=%d on interface %s", | |
72 | pim_ifp->pim_sock_fd, ifp->name); | |
73 | } | |
74 | ||
75 | if (close(pim_ifp->pim_sock_fd)) { | |
76 | zlog_warn("Failure closing PIM socket fd=%d on interface %s: errno=%d: %s", | |
77 | pim_ifp->pim_sock_fd, ifp->name, | |
78 | errno, safe_strerror(errno)); | |
79 | } | |
80 | ||
81 | pim_ifp->pim_sock_fd = -1; | |
82 | pim_ifp->pim_sock_creation = 0; | |
83 | ||
84 | zassert(pim_ifp->pim_sock_fd < 0); | |
85 | zassert(!pim_ifp->t_pim_sock_read); | |
86 | zassert(!pim_ifp->t_pim_hello_timer); | |
87 | zassert(!pim_ifp->pim_sock_creation); | |
88 | } | |
89 | ||
90 | void pim_sock_delete(struct interface *ifp, const char *delete_message) | |
91 | { | |
92 | zlog_info("PIM INTERFACE DOWN: on interface %s: %s", | |
93 | ifp->name, delete_message); | |
94 | ||
95 | if (!ifp->info) { | |
96 | zlog_err("%s: %s: but PIM not enabled on interface %s (!)", | |
97 | __PRETTY_FUNCTION__, delete_message, ifp->name); | |
98 | return; | |
99 | } | |
100 | ||
101 | /* | |
102 | RFC 4601: 4.3.1. Sending Hello Messages | |
103 | ||
104 | Before an interface goes down or changes primary IP address, a Hello | |
105 | message with a zero HoldTime should be sent immediately (with the | |
106 | old IP address if the IP address changed). | |
107 | */ | |
108 | pim_hello_send(ifp, 0 /* zero-sec holdtime */); | |
109 | ||
110 | pim_neighbor_delete_all(ifp, delete_message); | |
111 | ||
112 | sock_close(ifp); | |
113 | } | |
114 | ||
115 | int pim_pim_packet(struct interface *ifp, uint8_t *buf, size_t len) | |
116 | { | |
117 | struct ip *ip_hdr; | |
118 | size_t ip_hlen; /* ip header length in bytes */ | |
119 | char src_str[100]; | |
120 | char dst_str[100]; | |
121 | uint8_t *pim_msg; | |
122 | int pim_msg_len; | |
123 | uint8_t pim_version; | |
124 | uint8_t pim_type; | |
125 | uint16_t pim_checksum; /* received checksum */ | |
126 | uint16_t checksum; /* computed checksum */ | |
127 | struct pim_neighbor *neigh; | |
128 | ||
129 | if (!ifp->info) { | |
130 | zlog_warn("%s: PIM not enabled on interface %s", | |
131 | __PRETTY_FUNCTION__, ifp->name); | |
132 | return -1; | |
133 | } | |
134 | ||
135 | if (len < sizeof(*ip_hdr)) { | |
136 | zlog_warn("PIM packet size=%zu shorter than minimum=%zu", | |
137 | len, sizeof(*ip_hdr)); | |
138 | return -1; | |
139 | } | |
140 | ||
141 | ip_hdr = (struct ip *) buf; | |
142 | ||
143 | pim_inet4_dump("<src?>", ip_hdr->ip_src, src_str, sizeof(src_str)); | |
144 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, dst_str, sizeof(dst_str)); | |
145 | ||
146 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
147 | ||
148 | if (PIM_DEBUG_PIM_PACKETS) { | |
149 | zlog_debug("Recv IP packet from %s to %s on %s: size=%zu ip_header_size=%zu ip_proto=%d", | |
150 | src_str, dst_str, ifp->name, len, ip_hlen, ip_hdr->ip_p); | |
151 | } | |
152 | ||
153 | if (ip_hdr->ip_p != PIM_IP_PROTO_PIM) { | |
154 | zlog_warn("IP packet protocol=%d is not PIM=%d", | |
155 | ip_hdr->ip_p, PIM_IP_PROTO_PIM); | |
156 | return -1; | |
157 | } | |
158 | ||
159 | if (ip_hlen < PIM_IP_HEADER_MIN_LEN) { | |
160 | zlog_warn("IP packet header size=%zu shorter than minimum=%d", | |
161 | ip_hlen, PIM_IP_HEADER_MIN_LEN); | |
162 | return -1; | |
163 | } | |
164 | if (ip_hlen > PIM_IP_HEADER_MAX_LEN) { | |
165 | zlog_warn("IP packet header size=%zu greater than maximum=%d", | |
166 | ip_hlen, PIM_IP_HEADER_MAX_LEN); | |
167 | return -1; | |
168 | } | |
169 | ||
170 | pim_msg = buf + ip_hlen; | |
171 | pim_msg_len = len - ip_hlen; | |
172 | ||
173 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) { | |
174 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_len); | |
175 | } | |
176 | ||
177 | if (pim_msg_len < PIM_PIM_MIN_LEN) { | |
178 | zlog_warn("PIM message size=%d shorter than minimum=%d", | |
179 | pim_msg_len, PIM_PIM_MIN_LEN); | |
180 | return -1; | |
181 | } | |
182 | ||
183 | pim_version = PIM_MSG_HDR_GET_VERSION(pim_msg); | |
184 | pim_type = PIM_MSG_HDR_GET_TYPE(pim_msg); | |
185 | ||
186 | if (pim_version != PIM_PROTO_VERSION) { | |
187 | zlog_warn("Ignoring PIM pkt from %s with unsupported version: %d", | |
188 | ifp->name, pim_version); | |
189 | return -1; | |
190 | } | |
191 | ||
192 | /* save received checksum */ | |
193 | pim_checksum = PIM_MSG_HDR_GET_CHECKSUM(pim_msg); | |
194 | ||
195 | /* for computing checksum */ | |
196 | *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = 0; | |
197 | ||
198 | checksum = in_cksum(pim_msg, pim_msg_len); | |
199 | if (checksum != pim_checksum) { | |
200 | zlog_warn("Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
201 | ifp->name, pim_checksum, checksum); | |
202 | return -1; | |
203 | } | |
204 | ||
205 | if (PIM_DEBUG_PIM_PACKETS) { | |
206 | zlog_debug("Recv PIM packet from %s to %s on %s: ttl=%d pim_version=%d pim_type=%d pim_msg_size=%d checksum=%x", | |
207 | src_str, dst_str, ifp->name, ip_hdr->ip_ttl, | |
208 | pim_version, pim_type, pim_msg_len, checksum); | |
209 | } | |
210 | ||
77e390e5 | 211 | if (pim_type == PIM_MSG_TYPE_REG_STOP || |
566b83cf DS |
212 | pim_type == PIM_MSG_TYPE_BOOTSTRAP || |
213 | pim_type == PIM_MSG_TYPE_GRAFT || | |
214 | pim_type == PIM_MSG_TYPE_GRAFT_ACK || | |
215 | pim_type == PIM_MSG_TYPE_CANDIDATE) | |
216 | { | |
217 | if (PIM_DEBUG_PIM_PACKETS) { | |
218 | zlog_debug("Recv PIM packet type %d which is not currently understood", | |
219 | pim_type); | |
220 | } | |
221 | return -1; | |
222 | } | |
223 | ||
12e41d03 | 224 | if (pim_type == PIM_MSG_TYPE_HELLO) { |
77e390e5 DS |
225 | return pim_hello_recv(ifp, |
226 | ip_hdr->ip_src, | |
227 | pim_msg + PIM_MSG_HEADER_LEN, | |
228 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
229 | } else if (pim_type == PIM_MSG_TYPE_REGISTER) { | |
230 | return pim_register_recv(ifp, | |
231 | ip_hdr->ip_dst, | |
232 | ip_hdr->ip_src, | |
233 | pim_msg + PIM_MSG_HEADER_LEN, | |
234 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
12e41d03 DL |
235 | } |
236 | ||
237 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
238 | if (!neigh) { | |
239 | zlog_warn("%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
240 | __FILE__, __PRETTY_FUNCTION__, | |
241 | pim_type, src_str, ifp->name); | |
242 | return -1; | |
243 | } | |
244 | ||
245 | switch (pim_type) { | |
246 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
247 | return pim_joinprune_recv(ifp, neigh, | |
248 | ip_hdr->ip_src, | |
249 | pim_msg + PIM_MSG_HEADER_LEN, | |
250 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
77e390e5 | 251 | break; |
12e41d03 DL |
252 | case PIM_MSG_TYPE_ASSERT: |
253 | return pim_assert_recv(ifp, neigh, | |
254 | ip_hdr->ip_src, | |
255 | pim_msg + PIM_MSG_HEADER_LEN, | |
256 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
77e390e5 | 257 | break; |
12e41d03 DL |
258 | default: |
259 | zlog_warn("%s %s: unsupported PIM message type=%d from %s on %s", | |
260 | __FILE__, __PRETTY_FUNCTION__, | |
261 | pim_type, src_str, ifp->name); | |
77e390e5 | 262 | break; |
12e41d03 DL |
263 | } |
264 | ||
265 | return -1; | |
266 | } | |
267 | ||
268 | static void pim_sock_read_on(struct interface *ifp); | |
269 | ||
270 | static int pim_sock_read(struct thread *t) | |
271 | { | |
272 | struct interface *ifp; | |
273 | struct pim_interface *pim_ifp; | |
274 | int fd; | |
275 | struct sockaddr_in from; | |
276 | struct sockaddr_in to; | |
277 | socklen_t fromlen = sizeof(from); | |
278 | socklen_t tolen = sizeof(to); | |
279 | uint8_t buf[PIM_PIM_BUFSIZE_READ]; | |
280 | int len; | |
281 | int ifindex = -1; | |
282 | int result = -1; /* defaults to bad */ | |
283 | ||
284 | zassert(t); | |
285 | ||
286 | ifp = THREAD_ARG(t); | |
287 | zassert(ifp); | |
288 | ||
289 | fd = THREAD_FD(t); | |
290 | ||
291 | pim_ifp = ifp->info; | |
292 | zassert(pim_ifp); | |
293 | ||
294 | zassert(fd == pim_ifp->pim_sock_fd); | |
295 | ||
296 | len = pim_socket_recvfromto(fd, buf, sizeof(buf), | |
297 | &from, &fromlen, | |
298 | &to, &tolen, | |
299 | &ifindex); | |
300 | if (len < 0) { | |
301 | zlog_warn("Failure receiving IP PIM packet on fd=%d: errno=%d: %s", | |
302 | fd, errno, safe_strerror(errno)); | |
303 | goto done; | |
304 | } | |
305 | ||
306 | if (PIM_DEBUG_PIM_PACKETS) { | |
307 | char from_str[100]; | |
308 | char to_str[100]; | |
309 | ||
310 | if (!inet_ntop(AF_INET, &from.sin_addr, from_str, sizeof(from_str))) | |
311 | sprintf(from_str, "<from?>"); | |
312 | if (!inet_ntop(AF_INET, &to.sin_addr, to_str, sizeof(to_str))) | |
313 | sprintf(to_str, "<to?>"); | |
314 | ||
315 | zlog_debug("Recv IP PIM pkt size=%d from %s to %s on fd=%d on ifindex=%d (sock_ifindex=%d)", | |
316 | len, from_str, to_str, fd, ifindex, ifp->ifindex); | |
317 | } | |
318 | ||
319 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) { | |
320 | pim_pkt_dump(__PRETTY_FUNCTION__, buf, len); | |
321 | } | |
322 | ||
323 | #ifdef PIM_CHECK_RECV_IFINDEX_SANITY | |
324 | /* ifindex sanity check */ | |
325 | if (ifindex != (int) ifp->ifindex) { | |
326 | char from_str[100]; | |
327 | char to_str[100]; | |
328 | struct interface *recv_ifp; | |
329 | ||
330 | if (!inet_ntop(AF_INET, &from.sin_addr, from_str , sizeof(from_str))) | |
331 | sprintf(from_str, "<from?>"); | |
332 | if (!inet_ntop(AF_INET, &to.sin_addr, to_str , sizeof(to_str))) | |
333 | sprintf(to_str, "<to?>"); | |
334 | ||
335 | recv_ifp = if_lookup_by_index(ifindex); | |
336 | if (recv_ifp) { | |
337 | zassert(ifindex == (int) recv_ifp->ifindex); | |
338 | } | |
339 | ||
340 | #ifdef PIM_REPORT_RECV_IFINDEX_MISMATCH | |
341 | zlog_warn("Interface mismatch: recv PIM pkt from %s to %s on fd=%d: recv_ifindex=%d (%s) sock_ifindex=%d (%s)", | |
342 | from_str, to_str, fd, | |
343 | ifindex, recv_ifp ? recv_ifp->name : "<if-notfound>", | |
344 | ifp->ifindex, ifp->name); | |
345 | #endif | |
346 | goto done; | |
347 | } | |
348 | #endif | |
349 | ||
350 | int fail = pim_pim_packet(ifp, buf, len); | |
351 | if (fail) { | |
352 | zlog_warn("%s: pim_pim_packet() return=%d", | |
353 | __PRETTY_FUNCTION__, fail); | |
354 | goto done; | |
355 | } | |
356 | ||
357 | result = 0; /* good */ | |
358 | ||
359 | done: | |
360 | pim_sock_read_on(ifp); | |
361 | ||
362 | if (result) { | |
363 | ++pim_ifp->pim_ifstat_hello_recvfail; | |
364 | } | |
365 | ||
366 | return result; | |
367 | } | |
368 | ||
369 | static void pim_sock_read_on(struct interface *ifp) | |
370 | { | |
371 | struct pim_interface *pim_ifp; | |
372 | ||
373 | zassert(ifp); | |
374 | zassert(ifp->info); | |
375 | ||
376 | pim_ifp = ifp->info; | |
377 | ||
3010e99a | 378 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { |
12e41d03 DL |
379 | zlog_debug("Scheduling READ event on PIM socket fd=%d", |
380 | pim_ifp->pim_sock_fd); | |
381 | } | |
382 | pim_ifp->t_pim_sock_read = 0; | |
383 | zassert(!pim_ifp->t_pim_sock_read); | |
384 | THREAD_READ_ON(master, pim_ifp->t_pim_sock_read, pim_sock_read, ifp, | |
385 | pim_ifp->pim_sock_fd); | |
386 | } | |
387 | ||
388 | static int pim_sock_open(struct in_addr ifaddr, int ifindex) | |
389 | { | |
390 | int fd; | |
391 | ||
61ea3951 | 392 | fd = pim_socket_mcast(IPPROTO_PIM, ifaddr, ifindex, 0 /* loop=false */); |
12e41d03 DL |
393 | if (fd < 0) |
394 | return -1; | |
395 | ||
396 | if (pim_socket_join(fd, qpim_all_pim_routers_addr, ifaddr, ifindex)) { | |
2cd32c61 | 397 | close(fd); |
12e41d03 DL |
398 | return -2; |
399 | } | |
400 | ||
401 | return fd; | |
402 | } | |
403 | ||
404 | void pim_ifstat_reset(struct interface *ifp) | |
405 | { | |
406 | struct pim_interface *pim_ifp; | |
407 | ||
408 | zassert(ifp); | |
409 | ||
410 | pim_ifp = ifp->info; | |
411 | if (!pim_ifp) { | |
412 | return; | |
413 | } | |
414 | ||
415 | pim_ifp->pim_ifstat_start = pim_time_monotonic_sec(); | |
416 | pim_ifp->pim_ifstat_hello_sent = 0; | |
417 | pim_ifp->pim_ifstat_hello_sendfail = 0; | |
418 | pim_ifp->pim_ifstat_hello_recv = 0; | |
419 | pim_ifp->pim_ifstat_hello_recvfail = 0; | |
420 | } | |
421 | ||
422 | void pim_sock_reset(struct interface *ifp) | |
423 | { | |
424 | struct pim_interface *pim_ifp; | |
425 | ||
426 | zassert(ifp); | |
427 | zassert(ifp->info); | |
428 | ||
429 | pim_ifp = ifp->info; | |
430 | ||
431 | pim_ifp->primary_address = pim_find_primary_addr(ifp); | |
432 | ||
433 | pim_ifp->pim_sock_fd = -1; | |
434 | pim_ifp->pim_sock_creation = 0; | |
435 | pim_ifp->t_pim_sock_read = 0; | |
436 | ||
437 | pim_ifp->t_pim_hello_timer = 0; | |
438 | pim_ifp->pim_hello_period = PIM_DEFAULT_HELLO_PERIOD; | |
439 | pim_ifp->pim_default_holdtime = -1; /* unset: means 3.5 * pim_hello_period */ | |
440 | pim_ifp->pim_triggered_hello_delay = PIM_DEFAULT_TRIGGERED_HELLO_DELAY; | |
441 | pim_ifp->pim_dr_priority = PIM_DEFAULT_DR_PRIORITY; | |
442 | pim_ifp->pim_propagation_delay_msec = PIM_DEFAULT_PROPAGATION_DELAY_MSEC; | |
443 | pim_ifp->pim_override_interval_msec = PIM_DEFAULT_OVERRIDE_INTERVAL_MSEC; | |
444 | if (PIM_DEFAULT_CAN_DISABLE_JOIN_SUPPRESSION) { | |
445 | PIM_IF_DO_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
446 | } | |
447 | else { | |
448 | PIM_IF_DONT_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
449 | } | |
450 | ||
451 | /* neighbors without lan_delay */ | |
452 | pim_ifp->pim_number_of_nonlandelay_neighbors = 0; | |
453 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = 0; | |
454 | pim_ifp->pim_neighbors_highest_override_interval_msec = 0; | |
455 | ||
456 | /* DR Election */ | |
457 | pim_ifp->pim_dr_election_last = 0; /* timestamp */ | |
458 | pim_ifp->pim_dr_election_count = 0; | |
459 | pim_ifp->pim_dr_election_changes = 0; | |
460 | pim_ifp->pim_dr_num_nondrpri_neighbors = 0; /* neighbors without dr_pri */ | |
461 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
462 | ||
463 | pim_ifstat_reset(ifp); | |
464 | } | |
465 | ||
466 | int pim_msg_send(int fd, | |
467 | struct in_addr dst, | |
468 | uint8_t *pim_msg, | |
469 | int pim_msg_size, | |
470 | const char *ifname) | |
471 | { | |
472 | ssize_t sent; | |
473 | struct sockaddr_in to; | |
474 | socklen_t tolen; | |
475 | ||
476 | if (PIM_DEBUG_PIM_PACKETS) { | |
477 | char dst_str[100]; | |
478 | pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str)); | |
479 | zlog_debug("%s: to %s on %s: msg_size=%d checksum=%x", | |
480 | __PRETTY_FUNCTION__, | |
481 | dst_str, ifname, pim_msg_size, | |
482 | *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg)); | |
483 | } | |
484 | ||
12e41d03 | 485 | memset(&to, 0, sizeof(to)); |
12e41d03 DL |
486 | to.sin_family = AF_INET; |
487 | to.sin_addr = dst; | |
12e41d03 DL |
488 | tolen = sizeof(to); |
489 | ||
490 | if (PIM_DEBUG_PIM_PACKETDUMP_SEND) { | |
491 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_size); | |
492 | } | |
493 | ||
59e96cda DL |
494 | sent = sendto(fd, pim_msg, pim_msg_size, MSG_DONTWAIT, |
495 | (struct sockaddr *)&to, tolen); | |
12e41d03 DL |
496 | if (sent != (ssize_t) pim_msg_size) { |
497 | int e = errno; | |
498 | char dst_str[100]; | |
499 | pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str)); | |
500 | if (sent < 0) { | |
501 | zlog_warn("%s: sendto() failure to %s on %s: fd=%d msg_size=%d: errno=%d: %s", | |
502 | __PRETTY_FUNCTION__, | |
503 | dst_str, ifname, fd, pim_msg_size, | |
504 | e, safe_strerror(e)); | |
505 | } | |
506 | else { | |
507 | zlog_warn("%s: sendto() partial to %s on %s: fd=%d msg_size=%d: sent=%zd", | |
508 | __PRETTY_FUNCTION__, | |
509 | dst_str, ifname, fd, | |
510 | pim_msg_size, sent); | |
511 | } | |
512 | return -1; | |
513 | } | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | static int hello_send(struct interface *ifp, | |
519 | uint16_t holdtime) | |
520 | { | |
521 | uint8_t pim_msg[PIM_PIM_BUFSIZE_WRITE]; | |
522 | struct pim_interface *pim_ifp; | |
523 | int pim_tlv_size; | |
524 | int pim_msg_size; | |
525 | ||
526 | pim_ifp = ifp->info; | |
527 | ||
aea6cb94 | 528 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
529 | char dst_str[100]; |
530 | pim_inet4_dump("<dst?>", qpim_all_pim_routers_addr, dst_str, sizeof(dst_str)); | |
531 | zlog_debug("%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", | |
532 | __PRETTY_FUNCTION__, | |
533 | dst_str, ifp->name, | |
534 | holdtime, | |
535 | pim_ifp->pim_propagation_delay_msec, pim_ifp->pim_override_interval_msec, | |
536 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options), | |
537 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
538 | listcount(ifp->connected)); | |
539 | } | |
540 | ||
541 | pim_tlv_size = pim_hello_build_tlv(ifp->name, | |
542 | pim_msg + PIM_PIM_MIN_LEN, | |
543 | sizeof(pim_msg) - PIM_PIM_MIN_LEN, | |
544 | holdtime, | |
545 | pim_ifp->pim_dr_priority, | |
546 | pim_ifp->pim_generation_id, | |
547 | pim_ifp->pim_propagation_delay_msec, | |
548 | pim_ifp->pim_override_interval_msec, | |
549 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options), | |
550 | ifp->connected); | |
551 | if (pim_tlv_size < 0) { | |
552 | return -1; | |
553 | } | |
554 | ||
555 | pim_msg_size = pim_tlv_size + PIM_PIM_MIN_LEN; | |
556 | ||
557 | zassert(pim_msg_size >= PIM_PIM_MIN_LEN); | |
558 | zassert(pim_msg_size <= PIM_PIM_BUFSIZE_WRITE); | |
559 | ||
560 | pim_msg_build_header(pim_msg, pim_msg_size, | |
561 | PIM_MSG_TYPE_HELLO); | |
562 | ||
563 | if (pim_msg_send(pim_ifp->pim_sock_fd, | |
564 | qpim_all_pim_routers_addr, | |
565 | pim_msg, | |
566 | pim_msg_size, | |
567 | ifp->name)) { | |
aea6cb94 DS |
568 | if (PIM_DEBUG_PIM_HELLO) { |
569 | zlog_debug("%s: could not send PIM message on interface %s", | |
570 | __PRETTY_FUNCTION__, ifp->name); | |
571 | } | |
12e41d03 DL |
572 | return -2; |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int pim_hello_send(struct interface *ifp, | |
579 | uint16_t holdtime) | |
580 | { | |
581 | struct pim_interface *pim_ifp; | |
582 | ||
583 | zassert(ifp); | |
584 | pim_ifp = ifp->info; | |
585 | zassert(pim_ifp); | |
586 | ||
85b62aea DS |
587 | if (if_is_loopback (ifp)) |
588 | return 0; | |
589 | ||
12e41d03 DL |
590 | if (hello_send(ifp, holdtime)) { |
591 | ++pim_ifp->pim_ifstat_hello_sendfail; | |
592 | ||
aea6cb94 DS |
593 | if (PIM_DEBUG_PIM_HELLO) { |
594 | zlog_warn("Could not send PIM hello on interface %s", | |
595 | ifp->name); | |
596 | } | |
12e41d03 DL |
597 | return -1; |
598 | } | |
599 | ||
600 | ++pim_ifp->pim_ifstat_hello_sent; | |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
605 | static void hello_resched(struct interface *ifp) | |
606 | { | |
607 | struct pim_interface *pim_ifp; | |
608 | ||
609 | zassert(ifp); | |
610 | pim_ifp = ifp->info; | |
611 | zassert(pim_ifp); | |
612 | ||
aea6cb94 | 613 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
614 | zlog_debug("Rescheduling %d sec hello on interface %s", |
615 | pim_ifp->pim_hello_period, ifp->name); | |
616 | } | |
617 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
618 | THREAD_TIMER_ON(master, pim_ifp->t_pim_hello_timer, | |
619 | on_pim_hello_send, | |
620 | ifp, pim_ifp->pim_hello_period); | |
621 | } | |
622 | ||
623 | /* | |
624 | Periodic hello timer | |
625 | */ | |
626 | static int on_pim_hello_send(struct thread *t) | |
627 | { | |
628 | struct pim_interface *pim_ifp; | |
629 | struct interface *ifp; | |
630 | ||
631 | zassert(t); | |
632 | ifp = THREAD_ARG(t); | |
633 | zassert(ifp); | |
634 | ||
635 | pim_ifp = ifp->info; | |
636 | ||
637 | /* | |
638 | * Schedule next hello | |
639 | */ | |
640 | pim_ifp->t_pim_hello_timer = 0; | |
641 | hello_resched(ifp); | |
642 | ||
643 | /* | |
644 | * Send hello | |
645 | */ | |
646 | return pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
647 | } | |
648 | ||
649 | /* | |
650 | RFC 4601: 4.3.1. Sending Hello Messages | |
651 | ||
652 | Thus, if a router needs to send a Join/Prune or Assert message on an | |
653 | interface on which it has not yet sent a Hello message with the | |
654 | currently configured IP address, then it MUST immediately send the | |
655 | relevant Hello message without waiting for the Hello Timer to | |
656 | expire, followed by the Join/Prune or Assert message. | |
657 | */ | |
658 | void pim_hello_restart_now(struct interface *ifp) | |
659 | { | |
660 | struct pim_interface *pim_ifp; | |
661 | ||
662 | zassert(ifp); | |
663 | pim_ifp = ifp->info; | |
664 | zassert(pim_ifp); | |
665 | ||
666 | /* | |
667 | * Reset next hello timer | |
668 | */ | |
669 | hello_resched(ifp); | |
670 | ||
671 | /* | |
672 | * Immediately send hello | |
673 | */ | |
674 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
675 | } | |
676 | ||
677 | /* | |
678 | RFC 4601: 4.3.1. Sending Hello Messages | |
679 | ||
680 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
681 | when a Hello message is received from a new neighbor, or a Hello | |
682 | message with a new GenID is received from an existing neighbor, a | |
683 | new Hello message should be sent on this interface after a | |
684 | randomized delay between 0 and Triggered_Hello_Delay. | |
685 | */ | |
686 | void pim_hello_restart_triggered(struct interface *ifp) | |
687 | { | |
688 | struct pim_interface *pim_ifp; | |
689 | int triggered_hello_delay_msec; | |
690 | int random_msec; | |
691 | ||
692 | zassert(ifp); | |
693 | pim_ifp = ifp->info; | |
694 | zassert(pim_ifp); | |
695 | ||
696 | triggered_hello_delay_msec = 1000 * pim_ifp->pim_triggered_hello_delay; | |
697 | ||
698 | if (pim_ifp->t_pim_hello_timer) { | |
699 | long remain_msec = pim_time_timer_remain_msec(pim_ifp->t_pim_hello_timer); | |
700 | if (remain_msec <= triggered_hello_delay_msec) { | |
701 | /* Rescheduling hello would increase the delay, then it's faster | |
702 | to just wait for the scheduled periodic hello. */ | |
703 | return; | |
704 | } | |
705 | ||
706 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
707 | pim_ifp->t_pim_hello_timer = 0; | |
708 | } | |
709 | zassert(!pim_ifp->t_pim_hello_timer); | |
710 | ||
60b40924 | 711 | random_msec = random() % (triggered_hello_delay_msec + 1); |
12e41d03 | 712 | |
aea6cb94 | 713 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
714 | zlog_debug("Scheduling %d msec triggered hello on interface %s", |
715 | random_msec, ifp->name); | |
716 | } | |
717 | ||
718 | THREAD_TIMER_MSEC_ON(master, pim_ifp->t_pim_hello_timer, | |
719 | on_pim_hello_send, | |
720 | ifp, random_msec); | |
721 | } | |
722 | ||
723 | int pim_sock_add(struct interface *ifp) | |
724 | { | |
725 | struct pim_interface *pim_ifp; | |
726 | struct in_addr ifaddr; | |
c29c0f61 | 727 | uint32_t old_genid; |
12e41d03 DL |
728 | |
729 | pim_ifp = ifp->info; | |
730 | zassert(pim_ifp); | |
731 | ||
732 | if (pim_ifp->pim_sock_fd >= 0) { | |
733 | zlog_warn("Can't recreate existing PIM socket fd=%d for interface %s", | |
734 | pim_ifp->pim_sock_fd, ifp->name); | |
735 | return -1; | |
736 | } | |
737 | ||
738 | ifaddr = pim_ifp->primary_address; | |
739 | ||
740 | pim_ifp->pim_sock_fd = pim_sock_open(ifaddr, ifp->ifindex); | |
741 | if (pim_ifp->pim_sock_fd < 0) { | |
742 | zlog_warn("Could not open PIM socket on interface %s", | |
743 | ifp->name); | |
744 | return -2; | |
745 | } | |
746 | ||
747 | pim_ifp->t_pim_sock_read = 0; | |
748 | pim_ifp->pim_sock_creation = pim_time_monotonic_sec(); | |
749 | ||
c29c0f61 DS |
750 | /* |
751 | * Just ensure that the new generation id | |
752 | * actually chooses something different. | |
753 | * Actually ran across a case where this | |
754 | * happened, pre-switch to random(). | |
755 | * While this is unlikely to happen now | |
756 | * let's make sure it doesn't. | |
757 | */ | |
758 | old_genid = pim_ifp->pim_generation_id; | |
759 | ||
760 | while (old_genid == pim_ifp->pim_generation_id) | |
761 | pim_ifp->pim_generation_id = random(); | |
12e41d03 DL |
762 | |
763 | zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d", | |
764 | ifp->name, ifp->ifindex); | |
765 | ||
766 | /* | |
767 | * Start receiving PIM messages | |
768 | */ | |
769 | pim_sock_read_on(ifp); | |
770 | ||
771 | /* | |
772 | * Start sending PIM hello's | |
773 | */ | |
774 | pim_hello_restart_triggered(ifp); | |
775 | ||
776 | return 0; | |
777 | } |