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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 | ||
12e41d03 DL |
20 | */ |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "log.h" | |
25 | #include "thread.h" | |
26 | #include "memory.h" | |
744d91b3 | 27 | #include "if.h" |
12e41d03 DL |
28 | |
29 | #include "pimd.h" | |
30 | #include "pim_pim.h" | |
31 | #include "pim_time.h" | |
32 | #include "pim_iface.h" | |
33 | #include "pim_sock.h" | |
34 | #include "pim_str.h" | |
35 | #include "pim_util.h" | |
36 | #include "pim_tlv.h" | |
37 | #include "pim_neighbor.h" | |
38 | #include "pim_hello.h" | |
39 | #include "pim_join.h" | |
40 | #include "pim_assert.h" | |
41 | #include "pim_msg.h" | |
77e390e5 | 42 | #include "pim_register.h" |
12e41d03 DL |
43 | |
44 | static int on_pim_hello_send(struct thread *t); | |
45 | static int pim_hello_send(struct interface *ifp, | |
46 | uint16_t holdtime); | |
47 | ||
7643f0a1 DS |
48 | static |
49 | const char *pim_pim_msgtype2str (enum pim_msg_type type) | |
50 | { | |
51 | switch (type) | |
52 | { | |
53 | case PIM_MSG_TYPE_HELLO: return "HELLO"; | |
54 | case PIM_MSG_TYPE_REGISTER: return "REGISTER"; | |
55 | case PIM_MSG_TYPE_REG_STOP: return "REGSTOP"; | |
7f0c1c5f | 56 | case PIM_MSG_TYPE_JOIN_PRUNE: return "JOINPRUNE"; |
7643f0a1 DS |
57 | case PIM_MSG_TYPE_BOOTSTRAP: return "BOOT"; |
58 | case PIM_MSG_TYPE_ASSERT: return "ASSERT"; | |
59 | case PIM_MSG_TYPE_GRAFT: return "GRAFT"; | |
60 | case PIM_MSG_TYPE_GRAFT_ACK: return "GACK"; | |
61 | case PIM_MSG_TYPE_CANDIDATE: return "CANDIDATE"; | |
62 | } | |
63 | ||
64 | return "UNKNOWN"; | |
65 | } | |
66 | ||
12e41d03 DL |
67 | static void sock_close(struct interface *ifp) |
68 | { | |
69 | struct pim_interface *pim_ifp = ifp->info; | |
70 | ||
71 | if (PIM_DEBUG_PIM_TRACE) { | |
72 | if (pim_ifp->t_pim_sock_read) { | |
73 | zlog_debug("Cancelling READ event for PIM socket fd=%d on interface %s", | |
74 | pim_ifp->pim_sock_fd, | |
75 | ifp->name); | |
76 | } | |
77 | } | |
78 | THREAD_OFF(pim_ifp->t_pim_sock_read); | |
79 | ||
80 | if (PIM_DEBUG_PIM_TRACE) { | |
81 | if (pim_ifp->t_pim_hello_timer) { | |
82 | zlog_debug("Cancelling PIM hello timer for interface %s", | |
83 | ifp->name); | |
84 | } | |
85 | } | |
86 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
87 | ||
88 | if (PIM_DEBUG_PIM_TRACE) { | |
89 | zlog_debug("Deleting PIM socket fd=%d on interface %s", | |
90 | pim_ifp->pim_sock_fd, ifp->name); | |
91 | } | |
92 | ||
6abb1fc2 DS |
93 | /* |
94 | * If the fd is already deleted no need to do anything here | |
95 | */ | |
96 | if (pim_ifp->pim_sock_fd > 0 && close(pim_ifp->pim_sock_fd)) { | |
12e41d03 DL |
97 | zlog_warn("Failure closing PIM socket fd=%d on interface %s: errno=%d: %s", |
98 | pim_ifp->pim_sock_fd, ifp->name, | |
99 | errno, safe_strerror(errno)); | |
100 | } | |
101 | ||
102 | pim_ifp->pim_sock_fd = -1; | |
103 | pim_ifp->pim_sock_creation = 0; | |
12e41d03 DL |
104 | } |
105 | ||
106 | void pim_sock_delete(struct interface *ifp, const char *delete_message) | |
107 | { | |
108 | zlog_info("PIM INTERFACE DOWN: on interface %s: %s", | |
109 | ifp->name, delete_message); | |
110 | ||
111 | if (!ifp->info) { | |
112 | zlog_err("%s: %s: but PIM not enabled on interface %s (!)", | |
113 | __PRETTY_FUNCTION__, delete_message, ifp->name); | |
114 | return; | |
115 | } | |
116 | ||
117 | /* | |
118 | RFC 4601: 4.3.1. Sending Hello Messages | |
119 | ||
120 | Before an interface goes down or changes primary IP address, a Hello | |
121 | message with a zero HoldTime should be sent immediately (with the | |
122 | old IP address if the IP address changed). | |
123 | */ | |
124 | pim_hello_send(ifp, 0 /* zero-sec holdtime */); | |
125 | ||
126 | pim_neighbor_delete_all(ifp, delete_message); | |
127 | ||
128 | sock_close(ifp); | |
129 | } | |
130 | ||
131 | int pim_pim_packet(struct interface *ifp, uint8_t *buf, size_t len) | |
132 | { | |
133 | struct ip *ip_hdr; | |
134 | size_t ip_hlen; /* ip header length in bytes */ | |
135 | char src_str[100]; | |
136 | char dst_str[100]; | |
137 | uint8_t *pim_msg; | |
138 | int pim_msg_len; | |
139 | uint8_t pim_version; | |
7643f0a1 | 140 | enum pim_msg_type pim_type; |
12e41d03 DL |
141 | uint16_t pim_checksum; /* received checksum */ |
142 | uint16_t checksum; /* computed checksum */ | |
143 | struct pim_neighbor *neigh; | |
144 | ||
145 | if (!ifp->info) { | |
146 | zlog_warn("%s: PIM not enabled on interface %s", | |
147 | __PRETTY_FUNCTION__, ifp->name); | |
148 | return -1; | |
149 | } | |
150 | ||
151 | if (len < sizeof(*ip_hdr)) { | |
152 | zlog_warn("PIM packet size=%zu shorter than minimum=%zu", | |
153 | len, sizeof(*ip_hdr)); | |
154 | return -1; | |
155 | } | |
156 | ||
157 | ip_hdr = (struct ip *) buf; | |
158 | ||
159 | pim_inet4_dump("<src?>", ip_hdr->ip_src, src_str, sizeof(src_str)); | |
160 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, dst_str, sizeof(dst_str)); | |
161 | ||
162 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ | |
163 | ||
164 | if (PIM_DEBUG_PIM_PACKETS) { | |
165 | zlog_debug("Recv IP packet from %s to %s on %s: size=%zu ip_header_size=%zu ip_proto=%d", | |
166 | src_str, dst_str, ifp->name, len, ip_hlen, ip_hdr->ip_p); | |
167 | } | |
168 | ||
169 | if (ip_hdr->ip_p != PIM_IP_PROTO_PIM) { | |
170 | zlog_warn("IP packet protocol=%d is not PIM=%d", | |
171 | ip_hdr->ip_p, PIM_IP_PROTO_PIM); | |
172 | return -1; | |
173 | } | |
174 | ||
175 | if (ip_hlen < PIM_IP_HEADER_MIN_LEN) { | |
176 | zlog_warn("IP packet header size=%zu shorter than minimum=%d", | |
177 | ip_hlen, PIM_IP_HEADER_MIN_LEN); | |
178 | return -1; | |
179 | } | |
180 | if (ip_hlen > PIM_IP_HEADER_MAX_LEN) { | |
181 | zlog_warn("IP packet header size=%zu greater than maximum=%d", | |
182 | ip_hlen, PIM_IP_HEADER_MAX_LEN); | |
183 | return -1; | |
184 | } | |
185 | ||
186 | pim_msg = buf + ip_hlen; | |
187 | pim_msg_len = len - ip_hlen; | |
188 | ||
189 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) { | |
190 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_len); | |
191 | } | |
192 | ||
193 | if (pim_msg_len < PIM_PIM_MIN_LEN) { | |
194 | zlog_warn("PIM message size=%d shorter than minimum=%d", | |
195 | pim_msg_len, PIM_PIM_MIN_LEN); | |
196 | return -1; | |
197 | } | |
198 | ||
199 | pim_version = PIM_MSG_HDR_GET_VERSION(pim_msg); | |
200 | pim_type = PIM_MSG_HDR_GET_TYPE(pim_msg); | |
201 | ||
202 | if (pim_version != PIM_PROTO_VERSION) { | |
203 | zlog_warn("Ignoring PIM pkt from %s with unsupported version: %d", | |
204 | ifp->name, pim_version); | |
205 | return -1; | |
206 | } | |
207 | ||
208 | /* save received checksum */ | |
209 | pim_checksum = PIM_MSG_HDR_GET_CHECKSUM(pim_msg); | |
210 | ||
211 | /* for computing checksum */ | |
212 | *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = 0; | |
213 | ||
214 | checksum = in_cksum(pim_msg, pim_msg_len); | |
215 | if (checksum != pim_checksum) { | |
216 | zlog_warn("Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
217 | ifp->name, pim_checksum, checksum); | |
218 | return -1; | |
219 | } | |
220 | ||
221 | if (PIM_DEBUG_PIM_PACKETS) { | |
7643f0a1 DS |
222 | zlog_debug("Recv PIM %s packet from %s to %s on %s: ttl=%d pim_version=%d pim_msg_size=%d checksum=%x", |
223 | pim_pim_msgtype2str (pim_type), src_str, dst_str, ifp->name, | |
224 | ip_hdr->ip_ttl, pim_version, pim_msg_len, checksum); | |
12e41d03 DL |
225 | } |
226 | ||
4dffc880 | 227 | switch (pim_type) |
566b83cf | 228 | { |
4dffc880 DS |
229 | case PIM_MSG_TYPE_HELLO: |
230 | return pim_hello_recv (ifp, | |
231 | 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, | |
237 | ip_hdr->ip_dst, | |
238 | ip_hdr->ip_src, | |
239 | pim_msg + PIM_MSG_HEADER_LEN, | |
240 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
241 | break; | |
242 | case PIM_MSG_TYPE_REG_STOP: | |
56638739 DS |
243 | return pim_register_stop_recv (pim_msg + PIM_MSG_HEADER_LEN, |
244 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
4dffc880 DS |
245 | break; |
246 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
247 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
248 | if (!neigh) { | |
249 | zlog_warn("%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
250 | __FILE__, __PRETTY_FUNCTION__, | |
251 | pim_type, src_str, ifp->name); | |
252 | return -1; | |
253 | } | |
254 | return pim_joinprune_recv(ifp, neigh, | |
255 | 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 | zlog_warn("%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
263 | __FILE__, __PRETTY_FUNCTION__, | |
264 | pim_type, src_str, ifp->name); | |
265 | return -1; | |
266 | } | |
267 | return pim_assert_recv(ifp, neigh, | |
268 | ip_hdr->ip_src, | |
269 | pim_msg + PIM_MSG_HEADER_LEN, | |
270 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
271 | break; | |
272 | default: | |
566b83cf DS |
273 | if (PIM_DEBUG_PIM_PACKETS) { |
274 | zlog_debug("Recv PIM packet type %d which is not currently understood", | |
275 | pim_type); | |
276 | } | |
277 | return -1; | |
278 | } | |
12e41d03 DL |
279 | return -1; |
280 | } | |
281 | ||
282 | static void pim_sock_read_on(struct interface *ifp); | |
283 | ||
284 | static int pim_sock_read(struct thread *t) | |
285 | { | |
286 | struct interface *ifp; | |
287 | struct pim_interface *pim_ifp; | |
288 | int fd; | |
289 | struct sockaddr_in from; | |
290 | struct sockaddr_in to; | |
291 | socklen_t fromlen = sizeof(from); | |
292 | socklen_t tolen = sizeof(to); | |
293 | uint8_t buf[PIM_PIM_BUFSIZE_READ]; | |
294 | int len; | |
b892f1dd | 295 | ifindex_t ifindex = -1; |
12e41d03 DL |
296 | int result = -1; /* defaults to bad */ |
297 | ||
298 | zassert(t); | |
299 | ||
300 | ifp = THREAD_ARG(t); | |
301 | zassert(ifp); | |
302 | ||
303 | fd = THREAD_FD(t); | |
304 | ||
305 | pim_ifp = ifp->info; | |
306 | zassert(pim_ifp); | |
307 | ||
308 | zassert(fd == pim_ifp->pim_sock_fd); | |
309 | ||
310 | len = pim_socket_recvfromto(fd, buf, sizeof(buf), | |
311 | &from, &fromlen, | |
312 | &to, &tolen, | |
313 | &ifindex); | |
314 | if (len < 0) { | |
315 | zlog_warn("Failure receiving IP PIM packet on fd=%d: errno=%d: %s", | |
316 | fd, errno, safe_strerror(errno)); | |
317 | goto done; | |
318 | } | |
319 | ||
320 | if (PIM_DEBUG_PIM_PACKETS) { | |
321 | char from_str[100]; | |
322 | char to_str[100]; | |
323 | ||
324 | if (!inet_ntop(AF_INET, &from.sin_addr, from_str, sizeof(from_str))) | |
325 | sprintf(from_str, "<from?>"); | |
326 | if (!inet_ntop(AF_INET, &to.sin_addr, to_str, sizeof(to_str))) | |
327 | sprintf(to_str, "<to?>"); | |
328 | ||
329 | zlog_debug("Recv IP PIM pkt size=%d from %s to %s on fd=%d on ifindex=%d (sock_ifindex=%d)", | |
330 | len, from_str, to_str, fd, ifindex, ifp->ifindex); | |
331 | } | |
332 | ||
333 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) { | |
334 | pim_pkt_dump(__PRETTY_FUNCTION__, buf, len); | |
335 | } | |
336 | ||
337 | #ifdef PIM_CHECK_RECV_IFINDEX_SANITY | |
338 | /* ifindex sanity check */ | |
339 | if (ifindex != (int) ifp->ifindex) { | |
340 | char from_str[100]; | |
341 | char to_str[100]; | |
342 | struct interface *recv_ifp; | |
343 | ||
344 | if (!inet_ntop(AF_INET, &from.sin_addr, from_str , sizeof(from_str))) | |
345 | sprintf(from_str, "<from?>"); | |
346 | if (!inet_ntop(AF_INET, &to.sin_addr, to_str , sizeof(to_str))) | |
347 | sprintf(to_str, "<to?>"); | |
348 | ||
349 | recv_ifp = if_lookup_by_index(ifindex); | |
350 | if (recv_ifp) { | |
351 | zassert(ifindex == (int) recv_ifp->ifindex); | |
352 | } | |
353 | ||
354 | #ifdef PIM_REPORT_RECV_IFINDEX_MISMATCH | |
355 | zlog_warn("Interface mismatch: recv PIM pkt from %s to %s on fd=%d: recv_ifindex=%d (%s) sock_ifindex=%d (%s)", | |
356 | from_str, to_str, fd, | |
357 | ifindex, recv_ifp ? recv_ifp->name : "<if-notfound>", | |
358 | ifp->ifindex, ifp->name); | |
359 | #endif | |
360 | goto done; | |
361 | } | |
362 | #endif | |
363 | ||
364 | int fail = pim_pim_packet(ifp, buf, len); | |
365 | if (fail) { | |
a22e470b DS |
366 | if (PIM_DEBUG_PIM_PACKETS) |
367 | zlog_debug("%s: pim_pim_packet() return=%d", | |
368 | __PRETTY_FUNCTION__, fail); | |
12e41d03 DL |
369 | goto done; |
370 | } | |
371 | ||
372 | result = 0; /* good */ | |
373 | ||
374 | done: | |
375 | pim_sock_read_on(ifp); | |
376 | ||
377 | if (result) { | |
378 | ++pim_ifp->pim_ifstat_hello_recvfail; | |
379 | } | |
380 | ||
381 | return result; | |
382 | } | |
383 | ||
384 | static void pim_sock_read_on(struct interface *ifp) | |
385 | { | |
386 | struct pim_interface *pim_ifp; | |
387 | ||
388 | zassert(ifp); | |
389 | zassert(ifp->info); | |
390 | ||
391 | pim_ifp = ifp->info; | |
392 | ||
3010e99a | 393 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { |
12e41d03 DL |
394 | zlog_debug("Scheduling READ event on PIM socket fd=%d", |
395 | pim_ifp->pim_sock_fd); | |
396 | } | |
59ba0ac3 | 397 | pim_ifp->t_pim_sock_read = NULL; |
12e41d03 DL |
398 | zassert(!pim_ifp->t_pim_sock_read); |
399 | THREAD_READ_ON(master, pim_ifp->t_pim_sock_read, pim_sock_read, ifp, | |
400 | pim_ifp->pim_sock_fd); | |
401 | } | |
402 | ||
b892f1dd | 403 | static int pim_sock_open(struct in_addr ifaddr, ifindex_t ifindex) |
12e41d03 DL |
404 | { |
405 | int fd; | |
406 | ||
61ea3951 | 407 | fd = pim_socket_mcast(IPPROTO_PIM, ifaddr, ifindex, 0 /* loop=false */); |
12e41d03 DL |
408 | if (fd < 0) |
409 | return -1; | |
410 | ||
411 | if (pim_socket_join(fd, qpim_all_pim_routers_addr, ifaddr, ifindex)) { | |
2cd32c61 | 412 | close(fd); |
12e41d03 DL |
413 | return -2; |
414 | } | |
415 | ||
416 | return fd; | |
417 | } | |
418 | ||
419 | void pim_ifstat_reset(struct interface *ifp) | |
420 | { | |
421 | struct pim_interface *pim_ifp; | |
422 | ||
423 | zassert(ifp); | |
424 | ||
425 | pim_ifp = ifp->info; | |
426 | if (!pim_ifp) { | |
427 | return; | |
428 | } | |
429 | ||
430 | pim_ifp->pim_ifstat_start = pim_time_monotonic_sec(); | |
431 | pim_ifp->pim_ifstat_hello_sent = 0; | |
432 | pim_ifp->pim_ifstat_hello_sendfail = 0; | |
433 | pim_ifp->pim_ifstat_hello_recv = 0; | |
434 | pim_ifp->pim_ifstat_hello_recvfail = 0; | |
435 | } | |
436 | ||
437 | void pim_sock_reset(struct interface *ifp) | |
438 | { | |
439 | struct pim_interface *pim_ifp; | |
440 | ||
441 | zassert(ifp); | |
442 | zassert(ifp->info); | |
443 | ||
444 | pim_ifp = ifp->info; | |
445 | ||
446 | pim_ifp->primary_address = pim_find_primary_addr(ifp); | |
447 | ||
448 | pim_ifp->pim_sock_fd = -1; | |
449 | pim_ifp->pim_sock_creation = 0; | |
59ba0ac3 | 450 | pim_ifp->t_pim_sock_read = NULL; |
12e41d03 | 451 | |
59ba0ac3 | 452 | pim_ifp->t_pim_hello_timer = NULL; |
12e41d03 DL |
453 | pim_ifp->pim_hello_period = PIM_DEFAULT_HELLO_PERIOD; |
454 | pim_ifp->pim_default_holdtime = -1; /* unset: means 3.5 * pim_hello_period */ | |
455 | pim_ifp->pim_triggered_hello_delay = PIM_DEFAULT_TRIGGERED_HELLO_DELAY; | |
456 | pim_ifp->pim_dr_priority = PIM_DEFAULT_DR_PRIORITY; | |
457 | pim_ifp->pim_propagation_delay_msec = PIM_DEFAULT_PROPAGATION_DELAY_MSEC; | |
458 | pim_ifp->pim_override_interval_msec = 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 | } | |
462 | else { | |
463 | PIM_IF_DONT_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
464 | } | |
465 | ||
466 | /* neighbors without lan_delay */ | |
467 | pim_ifp->pim_number_of_nonlandelay_neighbors = 0; | |
468 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = 0; | |
469 | pim_ifp->pim_neighbors_highest_override_interval_msec = 0; | |
470 | ||
471 | /* DR Election */ | |
472 | pim_ifp->pim_dr_election_last = 0; /* timestamp */ | |
473 | pim_ifp->pim_dr_election_count = 0; | |
474 | pim_ifp->pim_dr_election_changes = 0; | |
475 | pim_ifp->pim_dr_num_nondrpri_neighbors = 0; /* neighbors without dr_pri */ | |
476 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
477 | ||
478 | pim_ifstat_reset(ifp); | |
479 | } | |
480 | ||
4df01a4e DS |
481 | static uint16_t ip_id = 0; |
482 | ||
c305ed63 DS |
483 | |
484 | static int | |
485 | pim_msg_send_frame (int fd, char *buf, size_t len, | |
486 | struct sockaddr *dst, size_t salen) | |
487 | { | |
488 | struct ip *ip = (struct ip *)buf; | |
489 | ||
490 | while (sendto (fd, buf, len, MSG_DONTWAIT, dst, salen) < 0) | |
491 | { | |
492 | char dst_str[100]; | |
493 | ||
494 | switch (errno) | |
495 | { | |
496 | case EMSGSIZE: | |
497 | { | |
498 | size_t hdrsize = sizeof (struct ip); | |
499 | size_t newlen1 = ((len - hdrsize) / 2 ) & 0xFFF8; | |
500 | size_t sendlen = newlen1 + hdrsize; | |
501 | size_t offset = ntohs (ip->ip_off); | |
502 | ||
503 | ip->ip_len = htons (sendlen); | |
504 | ip->ip_off = htons (offset | IP_MF); | |
505 | if (pim_msg_send_frame (fd, buf, sendlen, dst, salen) == 0) | |
506 | { | |
507 | struct ip *ip2 = (struct ip *)(buf + newlen1); | |
508 | size_t newlen2 = len - sendlen; | |
509 | sendlen = newlen2 + hdrsize; | |
510 | ||
511 | memcpy (ip2, ip, hdrsize); | |
512 | ip2->ip_len = htons (sendlen); | |
513 | ip2->ip_off = htons (offset + (newlen1 >> 3)); | |
514 | return pim_msg_send_frame (fd, (char *)ip2, sendlen, dst, salen); | |
515 | } | |
516 | } | |
517 | ||
518 | return -1; | |
519 | break; | |
520 | default: | |
521 | pim_inet4_dump ("<dst?>", ip->ip_dst, dst_str, sizeof (dst_str)); | |
522 | zlog_warn ("%s: sendto() failure to %s: fd=%d msg_size=%zd: errno=%d: %s", | |
523 | __PRETTY_FUNCTION__, | |
524 | dst_str, fd, len, | |
525 | errno, safe_strerror(errno)); | |
c305ed63 | 526 | return -1; |
29444f8f | 527 | break; |
c305ed63 DS |
528 | } |
529 | } | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | int | |
535 | pim_msg_send(int fd, struct in_addr src, | |
536 | struct in_addr dst, uint8_t *pim_msg, | |
537 | int pim_msg_size, const char *ifname) | |
12e41d03 | 538 | { |
12e41d03 DL |
539 | struct sockaddr_in to; |
540 | socklen_t tolen; | |
4df01a4e DS |
541 | unsigned char buffer[3000]; |
542 | unsigned char *msg_start; | |
543 | struct ip *ip; | |
544 | ||
545 | memset (buffer, 0, 3000); | |
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 | ip = (struct ip *)buffer; | |
552 | ip->ip_id = htons (++ip_id); | |
553 | ip->ip_hl = 5; | |
554 | ip->ip_v = 4; | |
555 | ip->ip_p = PIM_IP_PROTO_PIM; | |
556 | ip->ip_src = src; | |
557 | ip->ip_dst = dst; | |
558 | ip->ip_ttl = MAXTTL; | |
559 | ip->ip_len = htons (sendlen); | |
12e41d03 DL |
560 | |
561 | if (PIM_DEBUG_PIM_PACKETS) { | |
562 | char dst_str[100]; | |
563 | pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str)); | |
564 | zlog_debug("%s: to %s on %s: msg_size=%d checksum=%x", | |
565 | __PRETTY_FUNCTION__, | |
566 | dst_str, ifname, pim_msg_size, | |
567 | *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg)); | |
568 | } | |
569 | ||
12e41d03 | 570 | memset(&to, 0, sizeof(to)); |
12e41d03 DL |
571 | to.sin_family = AF_INET; |
572 | to.sin_addr = dst; | |
12e41d03 DL |
573 | tolen = sizeof(to); |
574 | ||
575 | if (PIM_DEBUG_PIM_PACKETDUMP_SEND) { | |
576 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_size); | |
577 | } | |
578 | ||
c305ed63 DS |
579 | pim_msg_send_frame (fd, (char *)buffer, sendlen, |
580 | (struct sockaddr *)&to, tolen); | |
12e41d03 DL |
581 | return 0; |
582 | } | |
583 | ||
584 | static int hello_send(struct interface *ifp, | |
585 | uint16_t holdtime) | |
586 | { | |
587 | uint8_t pim_msg[PIM_PIM_BUFSIZE_WRITE]; | |
588 | struct pim_interface *pim_ifp; | |
589 | int pim_tlv_size; | |
590 | int pim_msg_size; | |
591 | ||
592 | pim_ifp = ifp->info; | |
593 | ||
aea6cb94 | 594 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
595 | char dst_str[100]; |
596 | pim_inet4_dump("<dst?>", qpim_all_pim_routers_addr, dst_str, sizeof(dst_str)); | |
597 | 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", | |
598 | __PRETTY_FUNCTION__, | |
599 | dst_str, ifp->name, | |
600 | holdtime, | |
601 | pim_ifp->pim_propagation_delay_msec, pim_ifp->pim_override_interval_msec, | |
602 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options), | |
603 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
604 | listcount(ifp->connected)); | |
605 | } | |
606 | ||
607 | pim_tlv_size = pim_hello_build_tlv(ifp->name, | |
608 | pim_msg + PIM_PIM_MIN_LEN, | |
609 | sizeof(pim_msg) - PIM_PIM_MIN_LEN, | |
610 | holdtime, | |
611 | pim_ifp->pim_dr_priority, | |
612 | pim_ifp->pim_generation_id, | |
613 | pim_ifp->pim_propagation_delay_msec, | |
614 | pim_ifp->pim_override_interval_msec, | |
615 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options), | |
616 | ifp->connected); | |
617 | if (pim_tlv_size < 0) { | |
618 | return -1; | |
619 | } | |
620 | ||
621 | pim_msg_size = pim_tlv_size + PIM_PIM_MIN_LEN; | |
622 | ||
623 | zassert(pim_msg_size >= PIM_PIM_MIN_LEN); | |
624 | zassert(pim_msg_size <= PIM_PIM_BUFSIZE_WRITE); | |
625 | ||
626 | pim_msg_build_header(pim_msg, pim_msg_size, | |
627 | PIM_MSG_TYPE_HELLO); | |
628 | ||
629 | if (pim_msg_send(pim_ifp->pim_sock_fd, | |
4df01a4e | 630 | pim_ifp->primary_address, |
12e41d03 DL |
631 | qpim_all_pim_routers_addr, |
632 | pim_msg, | |
633 | pim_msg_size, | |
634 | ifp->name)) { | |
aea6cb94 DS |
635 | if (PIM_DEBUG_PIM_HELLO) { |
636 | zlog_debug("%s: could not send PIM message on interface %s", | |
637 | __PRETTY_FUNCTION__, ifp->name); | |
638 | } | |
12e41d03 DL |
639 | return -2; |
640 | } | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | static int pim_hello_send(struct interface *ifp, | |
646 | uint16_t holdtime) | |
647 | { | |
648 | struct pim_interface *pim_ifp; | |
649 | ||
650 | zassert(ifp); | |
651 | pim_ifp = ifp->info; | |
652 | zassert(pim_ifp); | |
653 | ||
85b62aea DS |
654 | if (if_is_loopback (ifp)) |
655 | return 0; | |
656 | ||
12e41d03 DL |
657 | if (hello_send(ifp, holdtime)) { |
658 | ++pim_ifp->pim_ifstat_hello_sendfail; | |
659 | ||
aea6cb94 DS |
660 | if (PIM_DEBUG_PIM_HELLO) { |
661 | zlog_warn("Could not send PIM hello on interface %s", | |
662 | ifp->name); | |
663 | } | |
12e41d03 DL |
664 | return -1; |
665 | } | |
666 | ||
667 | ++pim_ifp->pim_ifstat_hello_sent; | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | static void hello_resched(struct interface *ifp) | |
673 | { | |
674 | struct pim_interface *pim_ifp; | |
675 | ||
676 | zassert(ifp); | |
677 | pim_ifp = ifp->info; | |
678 | zassert(pim_ifp); | |
679 | ||
aea6cb94 | 680 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
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_TIMER_ON(master, pim_ifp->t_pim_hello_timer, | |
686 | on_pim_hello_send, | |
687 | ifp, pim_ifp->pim_hello_period); | |
688 | } | |
689 | ||
690 | /* | |
691 | Periodic hello timer | |
692 | */ | |
693 | static int on_pim_hello_send(struct thread *t) | |
694 | { | |
695 | struct pim_interface *pim_ifp; | |
696 | struct interface *ifp; | |
697 | ||
698 | zassert(t); | |
699 | ifp = THREAD_ARG(t); | |
700 | zassert(ifp); | |
701 | ||
702 | pim_ifp = ifp->info; | |
703 | ||
704 | /* | |
705 | * Schedule next hello | |
706 | */ | |
59ba0ac3 | 707 | pim_ifp->t_pim_hello_timer = NULL; |
12e41d03 DL |
708 | hello_resched(ifp); |
709 | ||
710 | /* | |
711 | * Send hello | |
712 | */ | |
713 | return pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
714 | } | |
715 | ||
716 | /* | |
717 | RFC 4601: 4.3.1. Sending Hello Messages | |
718 | ||
719 | Thus, if a router needs to send a Join/Prune or Assert message on an | |
720 | interface on which it has not yet sent a Hello message with the | |
721 | currently configured IP address, then it MUST immediately send the | |
722 | relevant Hello message without waiting for the Hello Timer to | |
723 | expire, followed by the Join/Prune or Assert message. | |
724 | */ | |
725 | void pim_hello_restart_now(struct interface *ifp) | |
726 | { | |
727 | struct pim_interface *pim_ifp; | |
728 | ||
729 | zassert(ifp); | |
730 | pim_ifp = ifp->info; | |
731 | zassert(pim_ifp); | |
732 | ||
733 | /* | |
734 | * Reset next hello timer | |
735 | */ | |
736 | hello_resched(ifp); | |
737 | ||
738 | /* | |
739 | * Immediately send hello | |
740 | */ | |
741 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
742 | } | |
743 | ||
744 | /* | |
745 | RFC 4601: 4.3.1. Sending Hello Messages | |
746 | ||
747 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
748 | when a Hello message is received from a new neighbor, or a Hello | |
749 | message with a new GenID is received from an existing neighbor, a | |
750 | new Hello message should be sent on this interface after a | |
751 | randomized delay between 0 and Triggered_Hello_Delay. | |
752 | */ | |
753 | void pim_hello_restart_triggered(struct interface *ifp) | |
754 | { | |
755 | struct pim_interface *pim_ifp; | |
756 | int triggered_hello_delay_msec; | |
757 | int random_msec; | |
758 | ||
759 | zassert(ifp); | |
760 | pim_ifp = ifp->info; | |
761 | zassert(pim_ifp); | |
762 | ||
763 | triggered_hello_delay_msec = 1000 * pim_ifp->pim_triggered_hello_delay; | |
764 | ||
765 | if (pim_ifp->t_pim_hello_timer) { | |
766 | long remain_msec = pim_time_timer_remain_msec(pim_ifp->t_pim_hello_timer); | |
767 | if (remain_msec <= triggered_hello_delay_msec) { | |
768 | /* Rescheduling hello would increase the delay, then it's faster | |
769 | to just wait for the scheduled periodic hello. */ | |
770 | return; | |
771 | } | |
772 | ||
773 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
59ba0ac3 | 774 | pim_ifp->t_pim_hello_timer = NULL; |
12e41d03 | 775 | } |
12e41d03 | 776 | |
60b40924 | 777 | random_msec = random() % (triggered_hello_delay_msec + 1); |
12e41d03 | 778 | |
aea6cb94 | 779 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
780 | zlog_debug("Scheduling %d msec triggered hello on interface %s", |
781 | random_msec, ifp->name); | |
782 | } | |
783 | ||
784 | THREAD_TIMER_MSEC_ON(master, pim_ifp->t_pim_hello_timer, | |
785 | on_pim_hello_send, | |
786 | ifp, random_msec); | |
787 | } | |
788 | ||
789 | int pim_sock_add(struct interface *ifp) | |
790 | { | |
791 | struct pim_interface *pim_ifp; | |
792 | struct in_addr ifaddr; | |
c29c0f61 | 793 | uint32_t old_genid; |
12e41d03 DL |
794 | |
795 | pim_ifp = ifp->info; | |
796 | zassert(pim_ifp); | |
797 | ||
798 | if (pim_ifp->pim_sock_fd >= 0) { | |
799 | zlog_warn("Can't recreate existing PIM socket fd=%d for interface %s", | |
800 | pim_ifp->pim_sock_fd, ifp->name); | |
801 | return -1; | |
802 | } | |
803 | ||
804 | ifaddr = pim_ifp->primary_address; | |
805 | ||
806 | pim_ifp->pim_sock_fd = pim_sock_open(ifaddr, ifp->ifindex); | |
807 | if (pim_ifp->pim_sock_fd < 0) { | |
808 | zlog_warn("Could not open PIM socket on interface %s", | |
809 | ifp->name); | |
810 | return -2; | |
811 | } | |
812 | ||
4df01a4e DS |
813 | pim_socket_ip_hdr (pim_ifp->pim_sock_fd); |
814 | ||
59ba0ac3 | 815 | pim_ifp->t_pim_sock_read = NULL; |
12e41d03 DL |
816 | pim_ifp->pim_sock_creation = pim_time_monotonic_sec(); |
817 | ||
c29c0f61 DS |
818 | /* |
819 | * Just ensure that the new generation id | |
820 | * actually chooses something different. | |
821 | * Actually ran across a case where this | |
822 | * happened, pre-switch to random(). | |
823 | * While this is unlikely to happen now | |
824 | * let's make sure it doesn't. | |
825 | */ | |
826 | old_genid = pim_ifp->pim_generation_id; | |
827 | ||
828 | while (old_genid == pim_ifp->pim_generation_id) | |
829 | pim_ifp->pim_generation_id = random(); | |
12e41d03 DL |
830 | |
831 | zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d", | |
832 | ifp->name, ifp->ifindex); | |
833 | ||
834 | /* | |
835 | * Start receiving PIM messages | |
836 | */ | |
837 | pim_sock_read_on(ifp); | |
838 | ||
839 | /* | |
840 | * Start sending PIM hello's | |
841 | */ | |
842 | pim_hello_restart_triggered(ifp); | |
843 | ||
844 | return 0; | |
845 | } |