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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" |
12e41d03 DL |
41 | |
42 | static int on_pim_hello_send(struct thread *t); | |
d62a17ae | 43 | static int pim_hello_send(struct interface *ifp, uint16_t holdtime); |
12e41d03 | 44 | |
d62a17ae | 45 | static const char *pim_pim_msgtype2str(enum pim_msg_type type) |
7643f0a1 | 46 | { |
d62a17ae | 47 | switch (type) { |
48 | case PIM_MSG_TYPE_HELLO: | |
49 | return "HELLO"; | |
50 | case PIM_MSG_TYPE_REGISTER: | |
51 | return "REGISTER"; | |
52 | case PIM_MSG_TYPE_REG_STOP: | |
53 | return "REGSTOP"; | |
54 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
55 | return "JOINPRUNE"; | |
56 | case PIM_MSG_TYPE_BOOTSTRAP: | |
57 | return "BOOT"; | |
58 | case PIM_MSG_TYPE_ASSERT: | |
59 | return "ASSERT"; | |
60 | case PIM_MSG_TYPE_GRAFT: | |
61 | return "GRAFT"; | |
62 | case PIM_MSG_TYPE_GRAFT_ACK: | |
63 | return "GACK"; | |
64 | case PIM_MSG_TYPE_CANDIDATE: | |
65 | return "CANDIDATE"; | |
66 | } | |
67 | ||
68 | return "UNKNOWN"; | |
7643f0a1 DS |
69 | } |
70 | ||
12e41d03 DL |
71 | static void sock_close(struct interface *ifp) |
72 | { | |
d62a17ae | 73 | struct pim_interface *pim_ifp = ifp->info; |
74 | ||
75 | if (PIM_DEBUG_PIM_TRACE) { | |
76 | if (pim_ifp->t_pim_sock_read) { | |
77 | zlog_debug( | |
78 | "Cancelling READ event for PIM socket fd=%d on interface %s", | |
79 | pim_ifp->pim_sock_fd, ifp->name); | |
80 | } | |
81 | } | |
82 | THREAD_OFF(pim_ifp->t_pim_sock_read); | |
83 | ||
84 | if (PIM_DEBUG_PIM_TRACE) { | |
85 | if (pim_ifp->t_pim_hello_timer) { | |
86 | zlog_debug( | |
87 | "Cancelling PIM hello timer for interface %s", | |
88 | ifp->name); | |
89 | } | |
90 | } | |
91 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
92 | ||
93 | if (PIM_DEBUG_PIM_TRACE) { | |
94 | zlog_debug("Deleting PIM socket fd=%d on interface %s", | |
95 | pim_ifp->pim_sock_fd, ifp->name); | |
96 | } | |
97 | ||
98 | /* | |
99 | * If the fd is already deleted no need to do anything here | |
100 | */ | |
101 | if (pim_ifp->pim_sock_fd > 0 && close(pim_ifp->pim_sock_fd)) { | |
102 | zlog_warn( | |
103 | "Failure closing PIM socket fd=%d on interface %s: errno=%d: %s", | |
104 | pim_ifp->pim_sock_fd, ifp->name, errno, | |
105 | safe_strerror(errno)); | |
106 | } | |
107 | ||
108 | pim_ifp->pim_sock_fd = -1; | |
109 | pim_ifp->pim_sock_creation = 0; | |
12e41d03 DL |
110 | } |
111 | ||
112 | void pim_sock_delete(struct interface *ifp, const char *delete_message) | |
113 | { | |
d62a17ae | 114 | zlog_info("PIM INTERFACE DOWN: on interface %s: %s", ifp->name, |
115 | delete_message); | |
116 | ||
117 | if (!ifp->info) { | |
118 | zlog_err("%s: %s: but PIM not enabled on interface %s (!)", | |
119 | __PRETTY_FUNCTION__, delete_message, ifp->name); | |
120 | return; | |
121 | } | |
122 | ||
123 | /* | |
124 | RFC 4601: 4.3.1. Sending Hello Messages | |
125 | ||
126 | Before an interface goes down or changes primary IP address, a Hello | |
127 | message with a zero HoldTime should be sent immediately (with the | |
128 | old IP address if the IP address changed). | |
129 | */ | |
130 | pim_hello_send(ifp, 0 /* zero-sec holdtime */); | |
131 | ||
132 | pim_neighbor_delete_all(ifp, delete_message); | |
133 | ||
134 | sock_close(ifp); | |
12e41d03 DL |
135 | } |
136 | ||
137 | int pim_pim_packet(struct interface *ifp, uint8_t *buf, size_t len) | |
138 | { | |
d62a17ae | 139 | struct ip *ip_hdr; |
140 | size_t ip_hlen; /* ip header length in bytes */ | |
141 | char src_str[INET_ADDRSTRLEN]; | |
142 | char dst_str[INET_ADDRSTRLEN]; | |
143 | uint8_t *pim_msg; | |
144 | int pim_msg_len; | |
145 | uint16_t pim_checksum; /* received checksum */ | |
146 | uint16_t checksum; /* computed checksum */ | |
147 | struct pim_neighbor *neigh; | |
148 | struct pim_msg_header *header; | |
149 | ||
150 | if (len < sizeof(*ip_hdr)) { | |
151 | if (PIM_DEBUG_PIM_PACKETS) | |
152 | zlog_debug( | |
153 | "PIM packet size=%zu shorter than minimum=%zu", | |
154 | len, sizeof(*ip_hdr)); | |
155 | return -1; | |
156 | } | |
157 | ||
158 | ip_hdr = (struct ip *)buf; | |
159 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
160 | ||
161 | pim_msg = buf + ip_hlen; | |
162 | pim_msg_len = len - ip_hlen; | |
163 | ||
164 | header = (struct pim_msg_header *)pim_msg; | |
165 | if (pim_msg_len < PIM_PIM_MIN_LEN) { | |
166 | if (PIM_DEBUG_PIM_PACKETS) | |
167 | zlog_debug( | |
168 | "PIM message size=%d shorter than minimum=%d", | |
169 | pim_msg_len, PIM_PIM_MIN_LEN); | |
170 | return -1; | |
171 | } | |
172 | ||
173 | if (header->ver != PIM_PROTO_VERSION) { | |
174 | if (PIM_DEBUG_PIM_PACKETS) | |
175 | zlog_debug( | |
176 | "Ignoring PIM pkt from %s with unsupported version: %d", | |
177 | ifp->name, header->ver); | |
178 | return -1; | |
179 | } | |
180 | ||
181 | /* save received checksum */ | |
182 | pim_checksum = header->checksum; | |
183 | ||
184 | /* for computing checksum */ | |
185 | header->checksum = 0; | |
186 | ||
187 | if (header->type == PIM_MSG_TYPE_REGISTER) { | |
188 | /* First 8 byte header checksum */ | |
189 | checksum = in_cksum(pim_msg, PIM_MSG_REGISTER_LEN); | |
190 | if (checksum != pim_checksum) { | |
191 | checksum = in_cksum(pim_msg, pim_msg_len); | |
192 | if (checksum != pim_checksum) { | |
193 | if (PIM_DEBUG_PIM_PACKETS) | |
194 | zlog_debug( | |
195 | "Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
196 | ifp->name, pim_checksum, | |
197 | checksum); | |
198 | ||
199 | return -1; | |
200 | } | |
201 | } | |
202 | } else { | |
203 | checksum = in_cksum(pim_msg, pim_msg_len); | |
204 | if (checksum != pim_checksum) { | |
205 | if (PIM_DEBUG_PIM_PACKETS) | |
206 | zlog_debug( | |
207 | "Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
208 | ifp->name, pim_checksum, checksum); | |
209 | ||
210 | return -1; | |
211 | } | |
212 | } | |
213 | ||
214 | if (PIM_DEBUG_PIM_PACKETS) { | |
215 | pim_inet4_dump("<src?>", ip_hdr->ip_src, src_str, | |
216 | sizeof(src_str)); | |
217 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, dst_str, | |
218 | sizeof(dst_str)); | |
219 | zlog_debug( | |
220 | "Recv PIM %s packet from %s to %s on %s: ttl=%d pim_version=%d pim_msg_size=%d checksum=%x", | |
221 | pim_pim_msgtype2str(header->type), src_str, dst_str, | |
222 | ifp->name, ip_hdr->ip_ttl, header->ver, pim_msg_len, | |
223 | checksum); | |
224 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) { | |
225 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_len); | |
226 | } | |
227 | } | |
228 | ||
229 | switch (header->type) { | |
230 | case PIM_MSG_TYPE_HELLO: | |
231 | return pim_hello_recv(ifp, ip_hdr->ip_src, | |
232 | pim_msg + PIM_MSG_HEADER_LEN, | |
233 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
234 | break; | |
235 | case PIM_MSG_TYPE_REGISTER: | |
236 | return pim_register_recv(ifp, ip_hdr->ip_dst, ip_hdr->ip_src, | |
237 | pim_msg + PIM_MSG_HEADER_LEN, | |
238 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
239 | break; | |
240 | case PIM_MSG_TYPE_REG_STOP: | |
b206566b | 241 | return pim_register_stop_recv(ifp, pim_msg + PIM_MSG_HEADER_LEN, |
d62a17ae | 242 | pim_msg_len - PIM_MSG_HEADER_LEN); |
243 | break; | |
244 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
245 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
246 | if (!neigh) { | |
247 | if (PIM_DEBUG_PIM_PACKETS) | |
248 | zlog_debug( | |
249 | "%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
250 | __FILE__, __PRETTY_FUNCTION__, | |
251 | header->type, src_str, ifp->name); | |
252 | return -1; | |
253 | } | |
254 | pim_neighbor_timer_reset(neigh, neigh->holdtime); | |
255 | return pim_joinprune_recv(ifp, neigh, ip_hdr->ip_src, | |
256 | pim_msg + PIM_MSG_HEADER_LEN, | |
257 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
258 | break; | |
259 | case PIM_MSG_TYPE_ASSERT: | |
260 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
261 | if (!neigh) { | |
262 | if (PIM_DEBUG_PIM_PACKETS) | |
263 | zlog_debug( | |
264 | "%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
265 | __FILE__, __PRETTY_FUNCTION__, | |
266 | header->type, src_str, ifp->name); | |
267 | return -1; | |
268 | } | |
269 | pim_neighbor_timer_reset(neigh, neigh->holdtime); | |
270 | return pim_assert_recv(ifp, neigh, ip_hdr->ip_src, | |
271 | pim_msg + PIM_MSG_HEADER_LEN, | |
272 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
273 | break; | |
274 | default: | |
275 | if (PIM_DEBUG_PIM_PACKETS) { | |
276 | zlog_debug( | |
277 | "Recv PIM packet type %d which is not currently understood", | |
278 | header->type); | |
279 | } | |
280 | return -1; | |
281 | } | |
4dffc880 | 282 | return -1; |
12e41d03 DL |
283 | } |
284 | ||
285 | static void pim_sock_read_on(struct interface *ifp); | |
286 | ||
287 | static int pim_sock_read(struct thread *t) | |
288 | { | |
9487552c | 289 | struct interface *ifp, *orig_ifp; |
d62a17ae | 290 | struct pim_interface *pim_ifp; |
291 | int fd; | |
292 | struct sockaddr_in from; | |
293 | struct sockaddr_in to; | |
294 | socklen_t fromlen = sizeof(from); | |
295 | socklen_t tolen = sizeof(to); | |
296 | uint8_t buf[PIM_PIM_BUFSIZE_READ]; | |
297 | int len; | |
298 | ifindex_t ifindex = -1; | |
299 | int result = -1; /* defaults to bad */ | |
300 | static long long count = 0; | |
301 | int cont = 1; | |
302 | ||
9487552c | 303 | orig_ifp = ifp = THREAD_ARG(t); |
d62a17ae | 304 | fd = THREAD_FD(t); |
305 | ||
306 | pim_ifp = ifp->info; | |
307 | ||
308 | while (cont) { | |
309 | len = pim_socket_recvfromto(fd, buf, sizeof(buf), &from, | |
310 | &fromlen, &to, &tolen, &ifindex); | |
311 | if (len < 0) { | |
312 | if (errno == EINTR) | |
313 | continue; | |
314 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
315 | break; | |
316 | ||
317 | if (PIM_DEBUG_PIM_PACKETS) | |
318 | zlog_debug("Received errno: %d %s", errno, | |
319 | safe_strerror(errno)); | |
320 | goto done; | |
321 | } | |
12e41d03 | 322 | |
e2d451e2 DS |
323 | /* |
324 | * What? So with vrf's the incoming packet is received | |
325 | * on the vrf interface but recvfromto above returns | |
326 | * the right ifindex, so just use it. We know | |
327 | * it's the right interface because we bind to it | |
328 | */ | |
329 | ifp = if_lookup_by_index(ifindex, pim_ifp->pim->vrf_id); | |
05d8470f | 330 | if (!ifp || !ifp->info) { |
a5b6bd2b DS |
331 | if (PIM_DEBUG_PIM_PACKETS) |
332 | zlog_debug( | |
05d8470f DS |
333 | "%s: Received incoming pim packet on interface not yet configured for pim", |
334 | __PRETTY_FUNCTION__); | |
a5b6bd2b DS |
335 | goto done; |
336 | } | |
d62a17ae | 337 | int fail = pim_pim_packet(ifp, buf, len); |
338 | if (fail) { | |
339 | if (PIM_DEBUG_PIM_PACKETS) | |
340 | zlog_debug("%s: pim_pim_packet() return=%d", | |
341 | __PRETTY_FUNCTION__, fail); | |
342 | goto done; | |
343 | } | |
344 | ||
345 | count++; | |
346 | if (count % qpim_packet_process == 0) | |
347 | cont = 0; | |
348 | } | |
12e41d03 | 349 | |
d62a17ae | 350 | result = 0; /* good */ |
12e41d03 | 351 | |
d62a17ae | 352 | done: |
9487552c | 353 | pim_sock_read_on(orig_ifp); |
12e41d03 | 354 | |
d62a17ae | 355 | if (result) { |
356 | ++pim_ifp->pim_ifstat_hello_recvfail; | |
357 | } | |
12e41d03 | 358 | |
d62a17ae | 359 | return result; |
12e41d03 DL |
360 | } |
361 | ||
362 | static void pim_sock_read_on(struct interface *ifp) | |
363 | { | |
d62a17ae | 364 | struct pim_interface *pim_ifp; |
12e41d03 | 365 | |
d62a17ae | 366 | zassert(ifp); |
367 | zassert(ifp->info); | |
12e41d03 | 368 | |
d62a17ae | 369 | pim_ifp = ifp->info; |
12e41d03 | 370 | |
d62a17ae | 371 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { |
372 | zlog_debug("Scheduling READ event on PIM socket fd=%d", | |
373 | pim_ifp->pim_sock_fd); | |
374 | } | |
375 | pim_ifp->t_pim_sock_read = NULL; | |
376 | thread_add_read(master, pim_sock_read, ifp, pim_ifp->pim_sock_fd, | |
377 | &pim_ifp->t_pim_sock_read); | |
12e41d03 DL |
378 | } |
379 | ||
e5dfe687 | 380 | static int pim_sock_open(struct interface *ifp) |
12e41d03 | 381 | { |
d62a17ae | 382 | int fd; |
383 | struct pim_interface *pim_ifp = ifp->info; | |
384 | ||
385 | fd = pim_socket_mcast(IPPROTO_PIM, pim_ifp->primary_address, ifp, | |
386 | 0 /* loop=false */); | |
387 | if (fd < 0) | |
388 | return -1; | |
389 | ||
390 | if (pim_socket_join(fd, qpim_all_pim_routers_addr, | |
391 | pim_ifp->primary_address, ifp->ifindex)) { | |
392 | close(fd); | |
393 | return -2; | |
394 | } | |
12e41d03 | 395 | |
d62a17ae | 396 | return fd; |
12e41d03 DL |
397 | } |
398 | ||
399 | void pim_ifstat_reset(struct interface *ifp) | |
400 | { | |
d62a17ae | 401 | struct pim_interface *pim_ifp; |
12e41d03 | 402 | |
d62a17ae | 403 | zassert(ifp); |
12e41d03 | 404 | |
d62a17ae | 405 | pim_ifp = ifp->info; |
406 | if (!pim_ifp) { | |
407 | return; | |
408 | } | |
12e41d03 | 409 | |
d62a17ae | 410 | pim_ifp->pim_ifstat_start = pim_time_monotonic_sec(); |
411 | pim_ifp->pim_ifstat_hello_sent = 0; | |
412 | pim_ifp->pim_ifstat_hello_sendfail = 0; | |
413 | pim_ifp->pim_ifstat_hello_recv = 0; | |
414 | pim_ifp->pim_ifstat_hello_recvfail = 0; | |
12e41d03 DL |
415 | } |
416 | ||
417 | void pim_sock_reset(struct interface *ifp) | |
418 | { | |
d62a17ae | 419 | struct pim_interface *pim_ifp; |
420 | ||
421 | zassert(ifp); | |
422 | zassert(ifp->info); | |
423 | ||
424 | pim_ifp = ifp->info; | |
425 | ||
426 | pim_ifp->primary_address = pim_find_primary_addr(ifp); | |
427 | ||
428 | pim_ifp->pim_sock_fd = -1; | |
429 | pim_ifp->pim_sock_creation = 0; | |
430 | pim_ifp->t_pim_sock_read = NULL; | |
431 | ||
432 | pim_ifp->t_pim_hello_timer = NULL; | |
433 | pim_ifp->pim_hello_period = PIM_DEFAULT_HELLO_PERIOD; | |
434 | pim_ifp->pim_default_holdtime = | |
435 | -1; /* unset: means 3.5 * pim_hello_period */ | |
436 | pim_ifp->pim_triggered_hello_delay = PIM_DEFAULT_TRIGGERED_HELLO_DELAY; | |
437 | pim_ifp->pim_dr_priority = PIM_DEFAULT_DR_PRIORITY; | |
438 | pim_ifp->pim_propagation_delay_msec = | |
439 | PIM_DEFAULT_PROPAGATION_DELAY_MSEC; | |
440 | pim_ifp->pim_override_interval_msec = | |
441 | PIM_DEFAULT_OVERRIDE_INTERVAL_MSEC; | |
442 | if (PIM_DEFAULT_CAN_DISABLE_JOIN_SUPPRESSION) { | |
443 | PIM_IF_DO_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
444 | } else { | |
445 | PIM_IF_DONT_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
446 | } | |
447 | ||
448 | /* neighbors without lan_delay */ | |
449 | pim_ifp->pim_number_of_nonlandelay_neighbors = 0; | |
450 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = 0; | |
451 | pim_ifp->pim_neighbors_highest_override_interval_msec = 0; | |
452 | ||
453 | /* DR Election */ | |
454 | pim_ifp->pim_dr_election_last = 0; /* timestamp */ | |
455 | pim_ifp->pim_dr_election_count = 0; | |
456 | pim_ifp->pim_dr_election_changes = 0; | |
457 | pim_ifp->pim_dr_num_nondrpri_neighbors = | |
458 | 0; /* neighbors without dr_pri */ | |
459 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
460 | ||
461 | pim_ifstat_reset(ifp); | |
12e41d03 DL |
462 | } |
463 | ||
4df01a4e DS |
464 | static uint16_t ip_id = 0; |
465 | ||
c305ed63 | 466 | |
d62a17ae | 467 | static int pim_msg_send_frame(int fd, char *buf, size_t len, |
468 | struct sockaddr *dst, size_t salen) | |
c305ed63 | 469 | { |
d62a17ae | 470 | struct ip *ip = (struct ip *)buf; |
471 | ||
472 | while (sendto(fd, buf, len, MSG_DONTWAIT, dst, salen) < 0) { | |
473 | char dst_str[INET_ADDRSTRLEN]; | |
474 | ||
475 | switch (errno) { | |
476 | case EMSGSIZE: { | |
477 | size_t hdrsize = sizeof(struct ip); | |
478 | size_t newlen1 = ((len - hdrsize) / 2) & 0xFFF8; | |
479 | size_t sendlen = newlen1 + hdrsize; | |
480 | size_t offset = ntohs(ip->ip_off); | |
481 | ||
482 | ip->ip_len = htons(sendlen); | |
483 | ip->ip_off = htons(offset | IP_MF); | |
484 | if (pim_msg_send_frame(fd, buf, sendlen, dst, salen) | |
485 | == 0) { | |
486 | struct ip *ip2 = (struct ip *)(buf + newlen1); | |
487 | size_t newlen2 = len - sendlen; | |
488 | sendlen = newlen2 + hdrsize; | |
489 | ||
490 | memcpy(ip2, ip, hdrsize); | |
491 | ip2->ip_len = htons(sendlen); | |
492 | ip2->ip_off = htons(offset + (newlen1 >> 3)); | |
493 | return pim_msg_send_frame(fd, (char *)ip2, | |
494 | sendlen, dst, salen); | |
495 | } | |
496 | } | |
497 | ||
498 | return -1; | |
499 | break; | |
500 | default: | |
501 | if (PIM_DEBUG_PIM_PACKETS) { | |
502 | pim_inet4_dump("<dst?>", ip->ip_dst, dst_str, | |
503 | sizeof(dst_str)); | |
504 | zlog_warn( | |
505 | "%s: sendto() failure to %s: fd=%d msg_size=%zd: errno=%d: %s", | |
506 | __PRETTY_FUNCTION__, dst_str, fd, len, | |
507 | errno, safe_strerror(errno)); | |
508 | } | |
509 | return -1; | |
510 | break; | |
511 | } | |
c305ed63 | 512 | } |
c305ed63 | 513 | |
d62a17ae | 514 | return 0; |
c305ed63 DS |
515 | } |
516 | ||
d62a17ae | 517 | int pim_msg_send(int fd, struct in_addr src, struct in_addr dst, |
518 | uint8_t *pim_msg, int pim_msg_size, const char *ifname) | |
12e41d03 | 519 | { |
d62a17ae | 520 | struct sockaddr_in to; |
521 | socklen_t tolen; | |
522 | unsigned char buffer[10000]; | |
523 | unsigned char *msg_start; | |
524 | uint8_t ttl = MAXTTL; | |
525 | struct pim_msg_header *header; | |
526 | struct ip *ip; | |
527 | ||
528 | memset(buffer, 0, 10000); | |
529 | int sendlen = sizeof(struct ip) + pim_msg_size; | |
530 | ||
531 | msg_start = buffer + sizeof(struct ip); | |
532 | memcpy(msg_start, pim_msg, pim_msg_size); | |
533 | ||
534 | header = (struct pim_msg_header *)pim_msg; | |
535 | /* | |
536 | * Omnios apparently doesn't have a #define for IP default | |
537 | * ttl that is the same as all other platforms. | |
538 | */ | |
05ea5cee DS |
539 | #ifndef IPDEFTTL |
540 | #define IPDEFTTL 64 | |
541 | #endif | |
d62a17ae | 542 | /* TTL for packets destine to ALL-PIM-ROUTERS is 1 */ |
543 | switch (header->type) { | |
544 | case PIM_MSG_TYPE_HELLO: | |
545 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
546 | case PIM_MSG_TYPE_BOOTSTRAP: | |
547 | case PIM_MSG_TYPE_ASSERT: | |
548 | ttl = 1; | |
549 | break; | |
550 | case PIM_MSG_TYPE_REGISTER: | |
551 | case PIM_MSG_TYPE_REG_STOP: | |
552 | case PIM_MSG_TYPE_GRAFT: | |
553 | case PIM_MSG_TYPE_GRAFT_ACK: | |
554 | case PIM_MSG_TYPE_CANDIDATE: | |
555 | ttl = IPDEFTTL; | |
556 | break; | |
557 | default: | |
558 | ttl = MAXTTL; | |
559 | break; | |
560 | } | |
561 | ||
562 | ip = (struct ip *)buffer; | |
563 | ip->ip_id = htons(++ip_id); | |
564 | ip->ip_hl = 5; | |
565 | ip->ip_v = 4; | |
566 | ip->ip_p = PIM_IP_PROTO_PIM; | |
567 | ip->ip_src = src; | |
568 | ip->ip_dst = dst; | |
569 | ip->ip_ttl = ttl; | |
570 | ip->ip_len = htons(sendlen); | |
571 | ||
572 | if (PIM_DEBUG_PIM_PACKETS) { | |
573 | struct pim_msg_header *header = | |
574 | (struct pim_msg_header *)pim_msg; | |
575 | char dst_str[INET_ADDRSTRLEN]; | |
576 | pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str)); | |
577 | zlog_debug("%s: to %s on %s: msg_size=%d checksum=%x", | |
578 | __PRETTY_FUNCTION__, dst_str, ifname, pim_msg_size, | |
579 | header->checksum); | |
580 | } | |
581 | ||
582 | memset(&to, 0, sizeof(to)); | |
583 | to.sin_family = AF_INET; | |
584 | to.sin_addr = dst; | |
585 | tolen = sizeof(to); | |
586 | ||
587 | if (PIM_DEBUG_PIM_PACKETDUMP_SEND) { | |
588 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_size); | |
589 | } | |
590 | ||
591 | pim_msg_send_frame(fd, (char *)buffer, sendlen, (struct sockaddr *)&to, | |
592 | tolen); | |
593 | return 0; | |
12e41d03 DL |
594 | } |
595 | ||
d62a17ae | 596 | static int hello_send(struct interface *ifp, uint16_t holdtime) |
12e41d03 | 597 | { |
d62a17ae | 598 | uint8_t pim_msg[PIM_PIM_BUFSIZE_WRITE]; |
599 | struct pim_interface *pim_ifp; | |
600 | int pim_tlv_size; | |
601 | int pim_msg_size; | |
602 | ||
603 | pim_ifp = ifp->info; | |
604 | ||
605 | if (PIM_DEBUG_PIM_HELLO) { | |
606 | char dst_str[INET_ADDRSTRLEN]; | |
607 | pim_inet4_dump("<dst?>", qpim_all_pim_routers_addr, dst_str, | |
608 | sizeof(dst_str)); | |
609 | zlog_debug( | |
610 | "%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", | |
611 | __PRETTY_FUNCTION__, dst_str, ifp->name, holdtime, | |
612 | pim_ifp->pim_propagation_delay_msec, | |
613 | pim_ifp->pim_override_interval_msec, | |
614 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION( | |
615 | pim_ifp->options), | |
616 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
617 | listcount(ifp->connected)); | |
618 | } | |
619 | ||
620 | pim_tlv_size = pim_hello_build_tlv( | |
621 | ifp, pim_msg + PIM_PIM_MIN_LEN, | |
622 | sizeof(pim_msg) - PIM_PIM_MIN_LEN, holdtime, | |
623 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
624 | pim_ifp->pim_propagation_delay_msec, | |
625 | pim_ifp->pim_override_interval_msec, | |
626 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options)); | |
627 | if (pim_tlv_size < 0) { | |
628 | return -1; | |
629 | } | |
630 | ||
631 | pim_msg_size = pim_tlv_size + PIM_PIM_MIN_LEN; | |
632 | ||
633 | zassert(pim_msg_size >= PIM_PIM_MIN_LEN); | |
634 | zassert(pim_msg_size <= PIM_PIM_BUFSIZE_WRITE); | |
635 | ||
636 | pim_msg_build_header(pim_msg, pim_msg_size, PIM_MSG_TYPE_HELLO); | |
637 | ||
638 | if (pim_msg_send(pim_ifp->pim_sock_fd, pim_ifp->primary_address, | |
639 | qpim_all_pim_routers_addr, pim_msg, pim_msg_size, | |
640 | ifp->name)) { | |
641 | if (PIM_DEBUG_PIM_HELLO) { | |
642 | zlog_debug( | |
643 | "%s: could not send PIM message on interface %s", | |
644 | __PRETTY_FUNCTION__, ifp->name); | |
645 | } | |
646 | return -2; | |
647 | } | |
648 | ||
649 | return 0; | |
12e41d03 DL |
650 | } |
651 | ||
d62a17ae | 652 | static int pim_hello_send(struct interface *ifp, uint16_t holdtime) |
12e41d03 | 653 | { |
11699c47 | 654 | struct pim_interface *pim_ifp = ifp->info; |
12e41d03 | 655 | |
7f432a28 | 656 | if (pim_if_is_loopback(ifp)) |
d62a17ae | 657 | return 0; |
85b62aea | 658 | |
d62a17ae | 659 | if (hello_send(ifp, holdtime)) { |
660 | ++pim_ifp->pim_ifstat_hello_sendfail; | |
12e41d03 | 661 | |
d62a17ae | 662 | if (PIM_DEBUG_PIM_HELLO) { |
663 | zlog_warn("Could not send PIM hello on interface %s", | |
664 | ifp->name); | |
665 | } | |
666 | return -1; | |
667 | } | |
12e41d03 | 668 | |
d62a17ae | 669 | ++pim_ifp->pim_ifstat_hello_sent; |
12e41d03 | 670 | |
d62a17ae | 671 | return 0; |
12e41d03 DL |
672 | } |
673 | ||
674 | static void hello_resched(struct interface *ifp) | |
675 | { | |
d62a17ae | 676 | struct pim_interface *pim_ifp; |
677 | ||
d62a17ae | 678 | pim_ifp = ifp->info; |
d62a17ae | 679 | |
680 | if (PIM_DEBUG_PIM_HELLO) { | |
681 | zlog_debug("Rescheduling %d sec hello on interface %s", | |
682 | pim_ifp->pim_hello_period, ifp->name); | |
683 | } | |
684 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
685 | thread_add_timer(master, on_pim_hello_send, ifp, | |
686 | pim_ifp->pim_hello_period, | |
687 | &pim_ifp->t_pim_hello_timer); | |
12e41d03 DL |
688 | } |
689 | ||
690 | /* | |
691 | Periodic hello timer | |
692 | */ | |
693 | static int on_pim_hello_send(struct thread *t) | |
694 | { | |
d62a17ae | 695 | struct pim_interface *pim_ifp; |
696 | struct interface *ifp; | |
12e41d03 | 697 | |
d62a17ae | 698 | ifp = THREAD_ARG(t); |
d62a17ae | 699 | pim_ifp = ifp->info; |
12e41d03 | 700 | |
d62a17ae | 701 | /* |
702 | * Schedule next hello | |
703 | */ | |
704 | hello_resched(ifp); | |
12e41d03 | 705 | |
d62a17ae | 706 | /* |
707 | * Send hello | |
708 | */ | |
709 | return pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
12e41d03 DL |
710 | } |
711 | ||
712 | /* | |
713 | RFC 4601: 4.3.1. Sending Hello Messages | |
714 | ||
715 | Thus, if a router needs to send a Join/Prune or Assert message on an | |
716 | interface on which it has not yet sent a Hello message with the | |
717 | currently configured IP address, then it MUST immediately send the | |
718 | relevant Hello message without waiting for the Hello Timer to | |
719 | expire, followed by the Join/Prune or Assert message. | |
720 | */ | |
721 | void pim_hello_restart_now(struct interface *ifp) | |
722 | { | |
d62a17ae | 723 | struct pim_interface *pim_ifp; |
12e41d03 | 724 | |
d62a17ae | 725 | pim_ifp = ifp->info; |
12e41d03 | 726 | |
d62a17ae | 727 | /* |
728 | * Reset next hello timer | |
729 | */ | |
730 | hello_resched(ifp); | |
12e41d03 | 731 | |
d62a17ae | 732 | /* |
733 | * Immediately send hello | |
734 | */ | |
735 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
12e41d03 DL |
736 | } |
737 | ||
738 | /* | |
739 | RFC 4601: 4.3.1. Sending Hello Messages | |
740 | ||
741 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
742 | when a Hello message is received from a new neighbor, or a Hello | |
743 | message with a new GenID is received from an existing neighbor, a | |
744 | new Hello message should be sent on this interface after a | |
745 | randomized delay between 0 and Triggered_Hello_Delay. | |
746 | */ | |
747 | void pim_hello_restart_triggered(struct interface *ifp) | |
748 | { | |
d62a17ae | 749 | struct pim_interface *pim_ifp; |
750 | int triggered_hello_delay_msec; | |
751 | int random_msec; | |
752 | ||
d62a17ae | 753 | pim_ifp = ifp->info; |
2aa1ca84 DS |
754 | |
755 | /* | |
756 | * No need to ever start loopback or vrf device hello's | |
757 | */ | |
7f432a28 | 758 | if (pim_if_is_loopback(ifp)) |
2aa1ca84 | 759 | return; |
d62a17ae | 760 | |
761 | /* | |
762 | * There exists situations where we have the a RPF out this | |
763 | * interface, but we haven't formed a neighbor yet. This | |
764 | * happens especially during interface flaps. While | |
765 | * we would like to handle this more gracefully in other | |
766 | * parts of the code. In order to get us up and running | |
767 | * let's just send the hello immediate'ish | |
768 | * This should be revisited when we get nexthop tracking | |
769 | * in and when we have a better handle on safely | |
770 | * handling the rpf information for upstreams that | |
771 | * we cannot legally reach yet. | |
772 | */ | |
773 | triggered_hello_delay_msec = 1; | |
774 | // triggered_hello_delay_msec = 1000 * | |
775 | // pim_ifp->pim_triggered_hello_delay; | |
776 | ||
777 | if (pim_ifp->t_pim_hello_timer) { | |
778 | long remain_msec = | |
779 | pim_time_timer_remain_msec(pim_ifp->t_pim_hello_timer); | |
780 | if (remain_msec <= triggered_hello_delay_msec) { | |
781 | /* Rescheduling hello would increase the delay, then | |
782 | it's faster | |
783 | to just wait for the scheduled periodic hello. */ | |
784 | return; | |
785 | } | |
786 | ||
787 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
788 | } | |
789 | ||
790 | random_msec = triggered_hello_delay_msec; | |
791 | // random_msec = random() % (triggered_hello_delay_msec + 1); | |
792 | ||
793 | if (PIM_DEBUG_PIM_HELLO) { | |
794 | zlog_debug("Scheduling %d msec triggered hello on interface %s", | |
795 | random_msec, ifp->name); | |
796 | } | |
797 | ||
798 | thread_add_timer_msec(master, on_pim_hello_send, ifp, random_msec, | |
799 | &pim_ifp->t_pim_hello_timer); | |
12e41d03 DL |
800 | } |
801 | ||
802 | int pim_sock_add(struct interface *ifp) | |
803 | { | |
d62a17ae | 804 | struct pim_interface *pim_ifp; |
805 | uint32_t old_genid; | |
806 | ||
807 | pim_ifp = ifp->info; | |
808 | zassert(pim_ifp); | |
809 | ||
810 | if (pim_ifp->pim_sock_fd >= 0) { | |
811 | if (PIM_DEBUG_PIM_PACKETS) | |
812 | zlog_debug( | |
813 | "Can't recreate existing PIM socket fd=%d for interface %s", | |
814 | pim_ifp->pim_sock_fd, ifp->name); | |
815 | return -1; | |
816 | } | |
817 | ||
818 | pim_ifp->pim_sock_fd = pim_sock_open(ifp); | |
819 | if (pim_ifp->pim_sock_fd < 0) { | |
820 | if (PIM_DEBUG_PIM_PACKETS) | |
821 | zlog_debug("Could not open PIM socket on interface %s", | |
822 | ifp->name); | |
823 | return -2; | |
824 | } | |
825 | ||
826 | pim_socket_ip_hdr(pim_ifp->pim_sock_fd); | |
827 | ||
828 | pim_ifp->t_pim_sock_read = NULL; | |
829 | pim_ifp->pim_sock_creation = pim_time_monotonic_sec(); | |
830 | ||
831 | /* | |
832 | * Just ensure that the new generation id | |
833 | * actually chooses something different. | |
834 | * Actually ran across a case where this | |
835 | * happened, pre-switch to random(). | |
836 | * While this is unlikely to happen now | |
837 | * let's make sure it doesn't. | |
838 | */ | |
839 | old_genid = pim_ifp->pim_generation_id; | |
840 | ||
841 | while (old_genid == pim_ifp->pim_generation_id) | |
842 | pim_ifp->pim_generation_id = random(); | |
843 | ||
844 | zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d", ifp->name, | |
845 | ifp->ifindex); | |
846 | ||
847 | /* | |
848 | * Start receiving PIM messages | |
849 | */ | |
850 | pim_sock_read_on(ifp); | |
851 | ||
852 | /* | |
853 | * Start sending PIM hello's | |
854 | */ | |
855 | pim_hello_restart_triggered(ifp); | |
856 | ||
857 | return 0; | |
12e41d03 | 858 | } |