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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 | |
12e41d03 DL |
19 | */ |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "log.h" | |
24 | #include "thread.h" | |
25 | #include "memory.h" | |
744d91b3 | 26 | #include "if.h" |
12e41d03 DL |
27 | |
28 | #include "pimd.h" | |
29 | #include "pim_pim.h" | |
30 | #include "pim_time.h" | |
31 | #include "pim_iface.h" | |
32 | #include "pim_sock.h" | |
33 | #include "pim_str.h" | |
34 | #include "pim_util.h" | |
35 | #include "pim_tlv.h" | |
36 | #include "pim_neighbor.h" | |
37 | #include "pim_hello.h" | |
38 | #include "pim_join.h" | |
39 | #include "pim_assert.h" | |
40 | #include "pim_msg.h" | |
77e390e5 | 41 | #include "pim_register.h" |
12e41d03 DL |
42 | |
43 | static int on_pim_hello_send(struct thread *t); | |
44 | static int pim_hello_send(struct interface *ifp, | |
45 | uint16_t holdtime); | |
46 | ||
7643f0a1 DS |
47 | static |
48 | const char *pim_pim_msgtype2str (enum pim_msg_type type) | |
49 | { | |
50 | switch (type) | |
51 | { | |
52 | case PIM_MSG_TYPE_HELLO: return "HELLO"; | |
53 | case PIM_MSG_TYPE_REGISTER: return "REGISTER"; | |
54 | case PIM_MSG_TYPE_REG_STOP: return "REGSTOP"; | |
7f0c1c5f | 55 | case PIM_MSG_TYPE_JOIN_PRUNE: return "JOINPRUNE"; |
7643f0a1 DS |
56 | case PIM_MSG_TYPE_BOOTSTRAP: return "BOOT"; |
57 | case PIM_MSG_TYPE_ASSERT: return "ASSERT"; | |
58 | case PIM_MSG_TYPE_GRAFT: return "GRAFT"; | |
59 | case PIM_MSG_TYPE_GRAFT_ACK: return "GACK"; | |
60 | case PIM_MSG_TYPE_CANDIDATE: return "CANDIDATE"; | |
61 | } | |
62 | ||
63 | return "UNKNOWN"; | |
64 | } | |
65 | ||
12e41d03 DL |
66 | static void sock_close(struct interface *ifp) |
67 | { | |
68 | struct pim_interface *pim_ifp = ifp->info; | |
69 | ||
70 | if (PIM_DEBUG_PIM_TRACE) { | |
71 | if (pim_ifp->t_pim_sock_read) { | |
72 | zlog_debug("Cancelling READ event for PIM socket fd=%d on interface %s", | |
73 | pim_ifp->pim_sock_fd, | |
74 | ifp->name); | |
75 | } | |
76 | } | |
77 | THREAD_OFF(pim_ifp->t_pim_sock_read); | |
78 | ||
79 | if (PIM_DEBUG_PIM_TRACE) { | |
80 | if (pim_ifp->t_pim_hello_timer) { | |
81 | zlog_debug("Cancelling PIM hello timer for interface %s", | |
82 | ifp->name); | |
83 | } | |
84 | } | |
85 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
86 | ||
87 | if (PIM_DEBUG_PIM_TRACE) { | |
88 | zlog_debug("Deleting PIM socket fd=%d on interface %s", | |
89 | pim_ifp->pim_sock_fd, ifp->name); | |
90 | } | |
91 | ||
6abb1fc2 DS |
92 | /* |
93 | * If the fd is already deleted no need to do anything here | |
94 | */ | |
95 | if (pim_ifp->pim_sock_fd > 0 && close(pim_ifp->pim_sock_fd)) { | |
12e41d03 DL |
96 | zlog_warn("Failure closing PIM socket fd=%d on interface %s: errno=%d: %s", |
97 | pim_ifp->pim_sock_fd, ifp->name, | |
98 | errno, safe_strerror(errno)); | |
99 | } | |
100 | ||
101 | pim_ifp->pim_sock_fd = -1; | |
102 | pim_ifp->pim_sock_creation = 0; | |
12e41d03 DL |
103 | } |
104 | ||
105 | void pim_sock_delete(struct interface *ifp, const char *delete_message) | |
106 | { | |
107 | zlog_info("PIM INTERFACE DOWN: on interface %s: %s", | |
108 | ifp->name, delete_message); | |
109 | ||
110 | if (!ifp->info) { | |
111 | zlog_err("%s: %s: but PIM not enabled on interface %s (!)", | |
112 | __PRETTY_FUNCTION__, delete_message, ifp->name); | |
113 | return; | |
114 | } | |
115 | ||
116 | /* | |
117 | RFC 4601: 4.3.1. Sending Hello Messages | |
118 | ||
119 | Before an interface goes down or changes primary IP address, a Hello | |
120 | message with a zero HoldTime should be sent immediately (with the | |
121 | old IP address if the IP address changed). | |
122 | */ | |
123 | pim_hello_send(ifp, 0 /* zero-sec holdtime */); | |
124 | ||
125 | pim_neighbor_delete_all(ifp, delete_message); | |
126 | ||
127 | sock_close(ifp); | |
128 | } | |
129 | ||
130 | int pim_pim_packet(struct interface *ifp, uint8_t *buf, size_t len) | |
131 | { | |
132 | struct ip *ip_hdr; | |
133 | size_t ip_hlen; /* ip header length in bytes */ | |
eaa54bdb DW |
134 | char src_str[INET_ADDRSTRLEN]; |
135 | char dst_str[INET_ADDRSTRLEN]; | |
12e41d03 DL |
136 | uint8_t *pim_msg; |
137 | int pim_msg_len; | |
12e41d03 DL |
138 | uint16_t pim_checksum; /* received checksum */ |
139 | uint16_t checksum; /* computed checksum */ | |
140 | struct pim_neighbor *neigh; | |
70ce34ae | 141 | struct pim_msg_header *header; |
12e41d03 | 142 | |
12e41d03 | 143 | if (len < sizeof(*ip_hdr)) { |
def1e807 DS |
144 | if (PIM_DEBUG_PIM_PACKETS) |
145 | zlog_debug("PIM packet size=%zu shorter than minimum=%zu", | |
146 | len, sizeof(*ip_hdr)); | |
12e41d03 DL |
147 | return -1; |
148 | } | |
149 | ||
150 | ip_hdr = (struct ip *) buf; | |
12e41d03 DL |
151 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ |
152 | ||
12e41d03 DL |
153 | pim_msg = buf + ip_hlen; |
154 | pim_msg_len = len - ip_hlen; | |
155 | ||
70ce34ae | 156 | header = (struct pim_msg_header *)pim_msg; |
12e41d03 | 157 | if (pim_msg_len < PIM_PIM_MIN_LEN) { |
0f055c0d DS |
158 | if (PIM_DEBUG_PIM_PACKETS) |
159 | zlog_debug("PIM message size=%d shorter than minimum=%d", | |
160 | pim_msg_len, PIM_PIM_MIN_LEN); | |
12e41d03 DL |
161 | return -1; |
162 | } | |
163 | ||
70ce34ae | 164 | if (header->ver != PIM_PROTO_VERSION) { |
def1e807 DS |
165 | if (PIM_DEBUG_PIM_PACKETS) |
166 | zlog_debug("Ignoring PIM pkt from %s with unsupported version: %d", | |
70ce34ae | 167 | ifp->name, header->ver); |
12e41d03 DL |
168 | return -1; |
169 | } | |
170 | ||
171 | /* save received checksum */ | |
70ce34ae | 172 | pim_checksum = header->checksum; |
12e41d03 DL |
173 | |
174 | /* for computing checksum */ | |
70ce34ae | 175 | header->checksum = 0; |
12e41d03 | 176 | |
70ce34ae | 177 | if (header->type == PIM_MSG_TYPE_REGISTER) |
5637da05 CS |
178 | { |
179 | /* First 8 byte header checksum */ | |
180 | checksum = in_cksum (pim_msg, PIM_MSG_REGISTER_LEN); | |
181 | if (checksum != pim_checksum) | |
182 | { | |
183 | checksum = in_cksum (pim_msg, pim_msg_len); | |
184 | if (checksum != pim_checksum) | |
185 | { | |
186 | if (PIM_DEBUG_PIM_PACKETS) | |
187 | zlog_debug | |
188 | ("Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
189 | ifp->name, pim_checksum, checksum); | |
190 | ||
191 | return -1; | |
192 | } | |
193 | } | |
194 | } | |
195 | else | |
196 | { | |
197 | checksum = in_cksum (pim_msg, pim_msg_len); | |
198 | if (checksum != pim_checksum) | |
199 | { | |
200 | if (PIM_DEBUG_PIM_PACKETS) | |
201 | zlog_debug | |
202 | ("Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
203 | ifp->name, pim_checksum, checksum); | |
204 | ||
205 | return -1; | |
206 | } | |
207 | } | |
12e41d03 DL |
208 | |
209 | if (PIM_DEBUG_PIM_PACKETS) { | |
0f055c0d DS |
210 | pim_inet4_dump("<src?>", ip_hdr->ip_src, src_str, sizeof(src_str)); |
211 | pim_inet4_dump("<dst?>", ip_hdr->ip_dst, dst_str, sizeof(dst_str)); | |
7643f0a1 | 212 | zlog_debug("Recv PIM %s packet from %s to %s on %s: ttl=%d pim_version=%d pim_msg_size=%d checksum=%x", |
70ce34ae DS |
213 | pim_pim_msgtype2str (header->type), src_str, dst_str, ifp->name, |
214 | ip_hdr->ip_ttl, header->ver, pim_msg_len, checksum); | |
0f055c0d DS |
215 | if (PIM_DEBUG_PIM_PACKETDUMP_RECV) { |
216 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_len); | |
217 | } | |
12e41d03 DL |
218 | } |
219 | ||
70ce34ae | 220 | switch (header->type) |
566b83cf | 221 | { |
4dffc880 DS |
222 | case PIM_MSG_TYPE_HELLO: |
223 | return pim_hello_recv (ifp, | |
224 | ip_hdr->ip_src, | |
225 | pim_msg + PIM_MSG_HEADER_LEN, | |
226 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
227 | break; | |
228 | case PIM_MSG_TYPE_REGISTER: | |
229 | return pim_register_recv (ifp, | |
230 | ip_hdr->ip_dst, | |
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_REG_STOP: | |
56638739 DS |
236 | return pim_register_stop_recv (pim_msg + PIM_MSG_HEADER_LEN, |
237 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
4dffc880 DS |
238 | break; |
239 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
240 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
241 | if (!neigh) { | |
def1e807 DS |
242 | if (PIM_DEBUG_PIM_PACKETS) |
243 | zlog_debug("%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
244 | __FILE__, __PRETTY_FUNCTION__, | |
70ce34ae | 245 | header->type, src_str, ifp->name); |
4dffc880 DS |
246 | return -1; |
247 | } | |
5a515ebe | 248 | pim_neighbor_timer_reset(neigh, neigh->holdtime); |
4dffc880 DS |
249 | return pim_joinprune_recv(ifp, neigh, |
250 | ip_hdr->ip_src, | |
251 | pim_msg + PIM_MSG_HEADER_LEN, | |
252 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
253 | break; | |
254 | case PIM_MSG_TYPE_ASSERT: | |
255 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
256 | if (!neigh) { | |
def1e807 DS |
257 | if (PIM_DEBUG_PIM_PACKETS) |
258 | zlog_debug("%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
259 | __FILE__, __PRETTY_FUNCTION__, | |
70ce34ae | 260 | header->type, src_str, ifp->name); |
4dffc880 DS |
261 | return -1; |
262 | } | |
5a515ebe | 263 | pim_neighbor_timer_reset(neigh, neigh->holdtime); |
4dffc880 DS |
264 | return pim_assert_recv(ifp, neigh, |
265 | ip_hdr->ip_src, | |
266 | pim_msg + PIM_MSG_HEADER_LEN, | |
267 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
268 | break; | |
269 | default: | |
566b83cf DS |
270 | if (PIM_DEBUG_PIM_PACKETS) { |
271 | zlog_debug("Recv PIM packet type %d which is not currently understood", | |
70ce34ae | 272 | header->type); |
566b83cf DS |
273 | } |
274 | return -1; | |
275 | } | |
12e41d03 DL |
276 | return -1; |
277 | } | |
278 | ||
279 | static void pim_sock_read_on(struct interface *ifp); | |
280 | ||
281 | static int pim_sock_read(struct thread *t) | |
282 | { | |
283 | struct interface *ifp; | |
284 | struct pim_interface *pim_ifp; | |
285 | int fd; | |
286 | struct sockaddr_in from; | |
287 | struct sockaddr_in to; | |
288 | socklen_t fromlen = sizeof(from); | |
289 | socklen_t tolen = sizeof(to); | |
290 | uint8_t buf[PIM_PIM_BUFSIZE_READ]; | |
291 | int len; | |
b892f1dd | 292 | ifindex_t ifindex = -1; |
12e41d03 | 293 | int result = -1; /* defaults to bad */ |
db48bcb2 DS |
294 | static long long count = 0; |
295 | int cont = 1; | |
12e41d03 | 296 | |
12e41d03 | 297 | ifp = THREAD_ARG(t); |
12e41d03 DL |
298 | fd = THREAD_FD(t); |
299 | ||
300 | pim_ifp = ifp->info; | |
12e41d03 | 301 | |
db48bcb2 DS |
302 | while (cont) |
303 | { | |
304 | len = pim_socket_recvfromto(fd, buf, sizeof(buf), | |
305 | &from, &fromlen, | |
306 | &to, &tolen, | |
307 | &ifindex); | |
308 | if (len < 0) | |
309 | { | |
310 | if (errno == EINTR) | |
311 | continue; | |
312 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
e43223bc DS |
313 | break; |
314 | ||
db48bcb2 DS |
315 | if (PIM_DEBUG_PIM_PACKETS) |
316 | zlog_debug ("Received errno: %d %s", errno, safe_strerror (errno)); | |
317 | goto done; | |
318 | } | |
12e41d03 | 319 | |
12e41d03 | 320 | #ifdef PIM_CHECK_RECV_IFINDEX_SANITY |
db48bcb2 DS |
321 | /* ifindex sanity check */ |
322 | if (ifindex != (int) ifp->ifindex) { | |
323 | char from_str[INET_ADDRSTRLEN]; | |
324 | char to_str[INET_ADDRSTRLEN]; | |
325 | struct interface *recv_ifp; | |
326 | ||
327 | if (!inet_ntop(AF_INET, &from.sin_addr, from_str , sizeof(from_str))) | |
328 | sprintf(from_str, "<from?>"); | |
329 | if (!inet_ntop(AF_INET, &to.sin_addr, to_str , sizeof(to_str))) | |
330 | sprintf(to_str, "<to?>"); | |
331 | ||
7e2b7603 | 332 | recv_ifp = if_lookup_by_index(ifindex, VRF_DEFAULT); |
db48bcb2 DS |
333 | if (recv_ifp) { |
334 | zassert(ifindex == (int) recv_ifp->ifindex); | |
335 | } | |
12e41d03 DL |
336 | |
337 | #ifdef PIM_REPORT_RECV_IFINDEX_MISMATCH | |
db48bcb2 DS |
338 | zlog_warn("Interface mismatch: recv PIM pkt from %s to %s on fd=%d: recv_ifindex=%d (%s) sock_ifindex=%d (%s)", |
339 | from_str, to_str, fd, | |
340 | ifindex, recv_ifp ? recv_ifp->name : "<if-notfound>", | |
341 | ifp->ifindex, ifp->name); | |
12e41d03 | 342 | #endif |
db48bcb2 DS |
343 | goto done; |
344 | } | |
12e41d03 DL |
345 | #endif |
346 | ||
db48bcb2 DS |
347 | int fail = pim_pim_packet(ifp, buf, len); |
348 | if (fail) { | |
349 | if (PIM_DEBUG_PIM_PACKETS) | |
350 | zlog_debug("%s: pim_pim_packet() return=%d", | |
351 | __PRETTY_FUNCTION__, fail); | |
352 | goto done; | |
353 | } | |
354 | ||
355 | count++; | |
8e4c9ef3 | 356 | if (count % qpim_packet_process == 0) |
db48bcb2 DS |
357 | cont = 0; |
358 | } | |
12e41d03 DL |
359 | |
360 | result = 0; /* good */ | |
361 | ||
362 | done: | |
363 | pim_sock_read_on(ifp); | |
364 | ||
365 | if (result) { | |
366 | ++pim_ifp->pim_ifstat_hello_recvfail; | |
367 | } | |
368 | ||
369 | return result; | |
370 | } | |
371 | ||
372 | static void pim_sock_read_on(struct interface *ifp) | |
373 | { | |
374 | struct pim_interface *pim_ifp; | |
375 | ||
376 | zassert(ifp); | |
377 | zassert(ifp->info); | |
378 | ||
379 | pim_ifp = ifp->info; | |
380 | ||
3010e99a | 381 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { |
12e41d03 DL |
382 | zlog_debug("Scheduling READ event on PIM socket fd=%d", |
383 | pim_ifp->pim_sock_fd); | |
384 | } | |
59ba0ac3 | 385 | pim_ifp->t_pim_sock_read = NULL; |
12e41d03 DL |
386 | THREAD_READ_ON(master, pim_ifp->t_pim_sock_read, pim_sock_read, ifp, |
387 | pim_ifp->pim_sock_fd); | |
388 | } | |
389 | ||
e5dfe687 | 390 | static int pim_sock_open(struct interface *ifp) |
12e41d03 DL |
391 | { |
392 | int fd; | |
e5dfe687 | 393 | struct pim_interface *pim_ifp = ifp->info; |
12e41d03 | 394 | |
e5dfe687 | 395 | fd = pim_socket_mcast(IPPROTO_PIM, pim_ifp->primary_address, ifp, 0 /* loop=false */); |
12e41d03 DL |
396 | if (fd < 0) |
397 | return -1; | |
398 | ||
e5dfe687 | 399 | if (pim_socket_join(fd, qpim_all_pim_routers_addr, pim_ifp->primary_address, ifp->ifindex)) { |
2cd32c61 | 400 | close(fd); |
12e41d03 DL |
401 | return -2; |
402 | } | |
403 | ||
404 | return fd; | |
405 | } | |
406 | ||
407 | void pim_ifstat_reset(struct interface *ifp) | |
408 | { | |
409 | struct pim_interface *pim_ifp; | |
410 | ||
411 | zassert(ifp); | |
412 | ||
413 | pim_ifp = ifp->info; | |
414 | if (!pim_ifp) { | |
415 | return; | |
416 | } | |
417 | ||
418 | pim_ifp->pim_ifstat_start = pim_time_monotonic_sec(); | |
419 | pim_ifp->pim_ifstat_hello_sent = 0; | |
420 | pim_ifp->pim_ifstat_hello_sendfail = 0; | |
421 | pim_ifp->pim_ifstat_hello_recv = 0; | |
422 | pim_ifp->pim_ifstat_hello_recvfail = 0; | |
423 | } | |
424 | ||
425 | void pim_sock_reset(struct interface *ifp) | |
426 | { | |
427 | struct pim_interface *pim_ifp; | |
428 | ||
429 | zassert(ifp); | |
430 | zassert(ifp->info); | |
431 | ||
432 | pim_ifp = ifp->info; | |
433 | ||
434 | pim_ifp->primary_address = pim_find_primary_addr(ifp); | |
435 | ||
436 | pim_ifp->pim_sock_fd = -1; | |
437 | pim_ifp->pim_sock_creation = 0; | |
59ba0ac3 | 438 | pim_ifp->t_pim_sock_read = NULL; |
12e41d03 | 439 | |
59ba0ac3 | 440 | pim_ifp->t_pim_hello_timer = NULL; |
12e41d03 DL |
441 | pim_ifp->pim_hello_period = PIM_DEFAULT_HELLO_PERIOD; |
442 | pim_ifp->pim_default_holdtime = -1; /* unset: means 3.5 * pim_hello_period */ | |
443 | pim_ifp->pim_triggered_hello_delay = PIM_DEFAULT_TRIGGERED_HELLO_DELAY; | |
444 | pim_ifp->pim_dr_priority = PIM_DEFAULT_DR_PRIORITY; | |
445 | pim_ifp->pim_propagation_delay_msec = PIM_DEFAULT_PROPAGATION_DELAY_MSEC; | |
446 | pim_ifp->pim_override_interval_msec = PIM_DEFAULT_OVERRIDE_INTERVAL_MSEC; | |
447 | if (PIM_DEFAULT_CAN_DISABLE_JOIN_SUPPRESSION) { | |
448 | PIM_IF_DO_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
449 | } | |
450 | else { | |
451 | PIM_IF_DONT_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options); | |
452 | } | |
453 | ||
454 | /* neighbors without lan_delay */ | |
455 | pim_ifp->pim_number_of_nonlandelay_neighbors = 0; | |
456 | pim_ifp->pim_neighbors_highest_propagation_delay_msec = 0; | |
457 | pim_ifp->pim_neighbors_highest_override_interval_msec = 0; | |
458 | ||
459 | /* DR Election */ | |
460 | pim_ifp->pim_dr_election_last = 0; /* timestamp */ | |
461 | pim_ifp->pim_dr_election_count = 0; | |
462 | pim_ifp->pim_dr_election_changes = 0; | |
463 | pim_ifp->pim_dr_num_nondrpri_neighbors = 0; /* neighbors without dr_pri */ | |
464 | pim_ifp->pim_dr_addr = pim_ifp->primary_address; | |
465 | ||
466 | pim_ifstat_reset(ifp); | |
467 | } | |
468 | ||
4df01a4e DS |
469 | static uint16_t ip_id = 0; |
470 | ||
c305ed63 DS |
471 | |
472 | static int | |
473 | pim_msg_send_frame (int fd, char *buf, size_t len, | |
474 | struct sockaddr *dst, size_t salen) | |
475 | { | |
476 | struct ip *ip = (struct ip *)buf; | |
477 | ||
478 | while (sendto (fd, buf, len, MSG_DONTWAIT, dst, salen) < 0) | |
479 | { | |
eaa54bdb | 480 | char dst_str[INET_ADDRSTRLEN]; |
c305ed63 DS |
481 | |
482 | switch (errno) | |
483 | { | |
484 | case EMSGSIZE: | |
485 | { | |
486 | size_t hdrsize = sizeof (struct ip); | |
487 | size_t newlen1 = ((len - hdrsize) / 2 ) & 0xFFF8; | |
488 | size_t sendlen = newlen1 + hdrsize; | |
489 | size_t offset = ntohs (ip->ip_off); | |
490 | ||
491 | ip->ip_len = htons (sendlen); | |
492 | ip->ip_off = htons (offset | IP_MF); | |
493 | if (pim_msg_send_frame (fd, buf, sendlen, dst, salen) == 0) | |
494 | { | |
495 | struct ip *ip2 = (struct ip *)(buf + newlen1); | |
496 | size_t newlen2 = len - sendlen; | |
497 | sendlen = newlen2 + hdrsize; | |
498 | ||
499 | memcpy (ip2, ip, hdrsize); | |
500 | ip2->ip_len = htons (sendlen); | |
501 | ip2->ip_off = htons (offset + (newlen1 >> 3)); | |
502 | return pim_msg_send_frame (fd, (char *)ip2, sendlen, dst, salen); | |
503 | } | |
504 | } | |
505 | ||
506 | return -1; | |
507 | break; | |
508 | default: | |
67f771b3 DS |
509 | if (PIM_DEBUG_PIM_PACKETS) |
510 | { | |
511 | pim_inet4_dump ("<dst?>", ip->ip_dst, dst_str, sizeof (dst_str)); | |
512 | zlog_warn ("%s: sendto() failure to %s: fd=%d msg_size=%zd: errno=%d: %s", | |
513 | __PRETTY_FUNCTION__, | |
514 | dst_str, fd, len, | |
515 | errno, safe_strerror(errno)); | |
516 | } | |
c305ed63 | 517 | return -1; |
29444f8f | 518 | break; |
c305ed63 DS |
519 | } |
520 | } | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | int | |
526 | pim_msg_send(int fd, struct in_addr src, | |
527 | struct in_addr dst, uint8_t *pim_msg, | |
528 | int pim_msg_size, const char *ifname) | |
12e41d03 | 529 | { |
12e41d03 DL |
530 | struct sockaddr_in to; |
531 | socklen_t tolen; | |
19e55095 | 532 | unsigned char buffer[10000]; |
4df01a4e | 533 | unsigned char *msg_start; |
d62c5c03 | 534 | uint8_t ttl = MAXTTL; |
70ce34ae | 535 | struct pim_msg_header *header; |
4df01a4e DS |
536 | struct ip *ip; |
537 | ||
19e55095 | 538 | memset (buffer, 0, 10000); |
4df01a4e DS |
539 | int sendlen = sizeof (struct ip) + pim_msg_size; |
540 | ||
541 | msg_start = buffer + sizeof (struct ip); | |
542 | memcpy (msg_start, pim_msg, pim_msg_size); | |
543 | ||
70ce34ae | 544 | header = (struct pim_msg_header *)pim_msg; |
05ea5cee DS |
545 | /* |
546 | * Omnios apparently doesn't have a #define for IP default | |
547 | * ttl that is the same as all other platforms. | |
548 | */ | |
549 | #ifndef IPDEFTTL | |
550 | #define IPDEFTTL 64 | |
551 | #endif | |
d62c5c03 | 552 | /* TTL for packets destine to ALL-PIM-ROUTERS is 1 */ |
70ce34ae | 553 | switch (header->type) |
d62c5c03 CS |
554 | { |
555 | case PIM_MSG_TYPE_HELLO: | |
556 | case PIM_MSG_TYPE_JOIN_PRUNE: | |
557 | case PIM_MSG_TYPE_BOOTSTRAP: | |
558 | case PIM_MSG_TYPE_ASSERT: | |
559 | ttl = 1; | |
560 | break; | |
561 | case PIM_MSG_TYPE_REGISTER: | |
562 | case PIM_MSG_TYPE_REG_STOP: | |
563 | case PIM_MSG_TYPE_GRAFT: | |
564 | case PIM_MSG_TYPE_GRAFT_ACK: | |
565 | case PIM_MSG_TYPE_CANDIDATE: | |
566 | ttl = IPDEFTTL; | |
567 | break; | |
568 | default: | |
569 | ttl = MAXTTL; | |
570 | break; | |
571 | } | |
572 | ||
573 | ip = (struct ip *) buffer; | |
4df01a4e DS |
574 | ip->ip_id = htons (++ip_id); |
575 | ip->ip_hl = 5; | |
576 | ip->ip_v = 4; | |
577 | ip->ip_p = PIM_IP_PROTO_PIM; | |
578 | ip->ip_src = src; | |
579 | ip->ip_dst = dst; | |
d62c5c03 | 580 | ip->ip_ttl = ttl; |
4df01a4e | 581 | ip->ip_len = htons (sendlen); |
12e41d03 DL |
582 | |
583 | if (PIM_DEBUG_PIM_PACKETS) { | |
70ce34ae | 584 | struct pim_msg_header *header = (struct pim_msg_header *)pim_msg; |
eaa54bdb | 585 | char dst_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
586 | pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str)); |
587 | zlog_debug("%s: to %s on %s: msg_size=%d checksum=%x", | |
588 | __PRETTY_FUNCTION__, | |
589 | dst_str, ifname, pim_msg_size, | |
70ce34ae | 590 | header->checksum); |
12e41d03 DL |
591 | } |
592 | ||
12e41d03 | 593 | memset(&to, 0, sizeof(to)); |
12e41d03 DL |
594 | to.sin_family = AF_INET; |
595 | to.sin_addr = dst; | |
12e41d03 DL |
596 | tolen = sizeof(to); |
597 | ||
598 | if (PIM_DEBUG_PIM_PACKETDUMP_SEND) { | |
599 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_size); | |
600 | } | |
601 | ||
c305ed63 DS |
602 | pim_msg_send_frame (fd, (char *)buffer, sendlen, |
603 | (struct sockaddr *)&to, tolen); | |
12e41d03 DL |
604 | return 0; |
605 | } | |
606 | ||
607 | static int hello_send(struct interface *ifp, | |
608 | uint16_t holdtime) | |
609 | { | |
610 | uint8_t pim_msg[PIM_PIM_BUFSIZE_WRITE]; | |
611 | struct pim_interface *pim_ifp; | |
612 | int pim_tlv_size; | |
613 | int pim_msg_size; | |
614 | ||
615 | pim_ifp = ifp->info; | |
616 | ||
aea6cb94 | 617 | if (PIM_DEBUG_PIM_HELLO) { |
eaa54bdb | 618 | char dst_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
619 | pim_inet4_dump("<dst?>", qpim_all_pim_routers_addr, dst_str, sizeof(dst_str)); |
620 | 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", | |
621 | __PRETTY_FUNCTION__, | |
622 | dst_str, ifp->name, | |
623 | holdtime, | |
624 | pim_ifp->pim_propagation_delay_msec, pim_ifp->pim_override_interval_msec, | |
625 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options), | |
626 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
627 | listcount(ifp->connected)); | |
628 | } | |
629 | ||
630 | pim_tlv_size = pim_hello_build_tlv(ifp->name, | |
631 | pim_msg + PIM_PIM_MIN_LEN, | |
632 | sizeof(pim_msg) - PIM_PIM_MIN_LEN, | |
633 | holdtime, | |
634 | pim_ifp->pim_dr_priority, | |
635 | pim_ifp->pim_generation_id, | |
636 | pim_ifp->pim_propagation_delay_msec, | |
637 | pim_ifp->pim_override_interval_msec, | |
638 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options), | |
639 | ifp->connected); | |
640 | if (pim_tlv_size < 0) { | |
641 | return -1; | |
642 | } | |
643 | ||
644 | pim_msg_size = pim_tlv_size + PIM_PIM_MIN_LEN; | |
645 | ||
646 | zassert(pim_msg_size >= PIM_PIM_MIN_LEN); | |
647 | zassert(pim_msg_size <= PIM_PIM_BUFSIZE_WRITE); | |
648 | ||
f8e7d799 | 649 | pim_msg_build_header(pim_msg, pim_msg_size, PIM_MSG_TYPE_HELLO); |
12e41d03 DL |
650 | |
651 | if (pim_msg_send(pim_ifp->pim_sock_fd, | |
4df01a4e | 652 | pim_ifp->primary_address, |
12e41d03 DL |
653 | qpim_all_pim_routers_addr, |
654 | pim_msg, | |
655 | pim_msg_size, | |
656 | ifp->name)) { | |
aea6cb94 DS |
657 | if (PIM_DEBUG_PIM_HELLO) { |
658 | zlog_debug("%s: could not send PIM message on interface %s", | |
659 | __PRETTY_FUNCTION__, ifp->name); | |
660 | } | |
12e41d03 DL |
661 | return -2; |
662 | } | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | static int pim_hello_send(struct interface *ifp, | |
668 | uint16_t holdtime) | |
669 | { | |
670 | struct pim_interface *pim_ifp; | |
671 | ||
672 | zassert(ifp); | |
673 | pim_ifp = ifp->info; | |
674 | zassert(pim_ifp); | |
675 | ||
85b62aea DS |
676 | if (if_is_loopback (ifp)) |
677 | return 0; | |
678 | ||
12e41d03 DL |
679 | if (hello_send(ifp, holdtime)) { |
680 | ++pim_ifp->pim_ifstat_hello_sendfail; | |
681 | ||
aea6cb94 DS |
682 | if (PIM_DEBUG_PIM_HELLO) { |
683 | zlog_warn("Could not send PIM hello on interface %s", | |
684 | ifp->name); | |
685 | } | |
12e41d03 DL |
686 | return -1; |
687 | } | |
688 | ||
689 | ++pim_ifp->pim_ifstat_hello_sent; | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static void hello_resched(struct interface *ifp) | |
695 | { | |
696 | struct pim_interface *pim_ifp; | |
697 | ||
698 | zassert(ifp); | |
699 | pim_ifp = ifp->info; | |
700 | zassert(pim_ifp); | |
701 | ||
aea6cb94 | 702 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
703 | zlog_debug("Rescheduling %d sec hello on interface %s", |
704 | pim_ifp->pim_hello_period, ifp->name); | |
705 | } | |
706 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
707 | THREAD_TIMER_ON(master, pim_ifp->t_pim_hello_timer, | |
708 | on_pim_hello_send, | |
709 | ifp, pim_ifp->pim_hello_period); | |
710 | } | |
711 | ||
712 | /* | |
713 | Periodic hello timer | |
714 | */ | |
715 | static int on_pim_hello_send(struct thread *t) | |
716 | { | |
717 | struct pim_interface *pim_ifp; | |
718 | struct interface *ifp; | |
719 | ||
12e41d03 | 720 | ifp = THREAD_ARG(t); |
12e41d03 DL |
721 | |
722 | pim_ifp = ifp->info; | |
723 | ||
724 | /* | |
725 | * Schedule next hello | |
726 | */ | |
59ba0ac3 | 727 | pim_ifp->t_pim_hello_timer = NULL; |
12e41d03 DL |
728 | hello_resched(ifp); |
729 | ||
730 | /* | |
731 | * Send hello | |
732 | */ | |
733 | return pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
734 | } | |
735 | ||
736 | /* | |
737 | RFC 4601: 4.3.1. Sending Hello Messages | |
738 | ||
739 | Thus, if a router needs to send a Join/Prune or Assert message on an | |
740 | interface on which it has not yet sent a Hello message with the | |
741 | currently configured IP address, then it MUST immediately send the | |
742 | relevant Hello message without waiting for the Hello Timer to | |
743 | expire, followed by the Join/Prune or Assert message. | |
744 | */ | |
745 | void pim_hello_restart_now(struct interface *ifp) | |
746 | { | |
747 | struct pim_interface *pim_ifp; | |
748 | ||
749 | zassert(ifp); | |
750 | pim_ifp = ifp->info; | |
751 | zassert(pim_ifp); | |
752 | ||
753 | /* | |
754 | * Reset next hello timer | |
755 | */ | |
756 | hello_resched(ifp); | |
757 | ||
758 | /* | |
759 | * Immediately send hello | |
760 | */ | |
761 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
762 | } | |
763 | ||
764 | /* | |
765 | RFC 4601: 4.3.1. Sending Hello Messages | |
766 | ||
767 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
768 | when a Hello message is received from a new neighbor, or a Hello | |
769 | message with a new GenID is received from an existing neighbor, a | |
770 | new Hello message should be sent on this interface after a | |
771 | randomized delay between 0 and Triggered_Hello_Delay. | |
772 | */ | |
773 | void pim_hello_restart_triggered(struct interface *ifp) | |
774 | { | |
775 | struct pim_interface *pim_ifp; | |
776 | int triggered_hello_delay_msec; | |
777 | int random_msec; | |
778 | ||
779 | zassert(ifp); | |
780 | pim_ifp = ifp->info; | |
781 | zassert(pim_ifp); | |
782 | ||
cf3cd99f DS |
783 | /* |
784 | * There exists situations where we have the a RPF out this | |
785 | * interface, but we haven't formed a neighbor yet. This | |
786 | * happens especially during interface flaps. While | |
787 | * we would like to handle this more gracefully in other | |
788 | * parts of the code. In order to get us up and running | |
789 | * let's just send the hello immediate'ish | |
790 | * This should be revisited when we get nexthop tracking | |
791 | * in and when we have a better handle on safely | |
792 | * handling the rpf information for upstreams that | |
793 | * we cannot legally reach yet. | |
794 | */ | |
795 | triggered_hello_delay_msec = 1; | |
796 | //triggered_hello_delay_msec = 1000 * pim_ifp->pim_triggered_hello_delay; | |
12e41d03 DL |
797 | |
798 | if (pim_ifp->t_pim_hello_timer) { | |
799 | long remain_msec = pim_time_timer_remain_msec(pim_ifp->t_pim_hello_timer); | |
800 | if (remain_msec <= triggered_hello_delay_msec) { | |
801 | /* Rescheduling hello would increase the delay, then it's faster | |
802 | to just wait for the scheduled periodic hello. */ | |
803 | return; | |
804 | } | |
805 | ||
806 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
59ba0ac3 | 807 | pim_ifp->t_pim_hello_timer = NULL; |
12e41d03 | 808 | } |
12e41d03 | 809 | |
cf3cd99f DS |
810 | random_msec = triggered_hello_delay_msec; |
811 | //random_msec = random() % (triggered_hello_delay_msec + 1); | |
12e41d03 | 812 | |
aea6cb94 | 813 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
814 | zlog_debug("Scheduling %d msec triggered hello on interface %s", |
815 | random_msec, ifp->name); | |
816 | } | |
817 | ||
818 | THREAD_TIMER_MSEC_ON(master, pim_ifp->t_pim_hello_timer, | |
819 | on_pim_hello_send, | |
820 | ifp, random_msec); | |
821 | } | |
822 | ||
823 | int pim_sock_add(struct interface *ifp) | |
824 | { | |
825 | struct pim_interface *pim_ifp; | |
c29c0f61 | 826 | uint32_t old_genid; |
12e41d03 DL |
827 | |
828 | pim_ifp = ifp->info; | |
829 | zassert(pim_ifp); | |
830 | ||
831 | if (pim_ifp->pim_sock_fd >= 0) { | |
def1e807 DS |
832 | if (PIM_DEBUG_PIM_PACKETS) |
833 | zlog_debug("Can't recreate existing PIM socket fd=%d for interface %s", | |
834 | pim_ifp->pim_sock_fd, ifp->name); | |
12e41d03 DL |
835 | return -1; |
836 | } | |
837 | ||
e5dfe687 | 838 | pim_ifp->pim_sock_fd = pim_sock_open(ifp); |
12e41d03 | 839 | if (pim_ifp->pim_sock_fd < 0) { |
def1e807 DS |
840 | if (PIM_DEBUG_PIM_PACKETS) |
841 | zlog_debug("Could not open PIM socket on interface %s", | |
842 | ifp->name); | |
12e41d03 DL |
843 | return -2; |
844 | } | |
845 | ||
4df01a4e DS |
846 | pim_socket_ip_hdr (pim_ifp->pim_sock_fd); |
847 | ||
59ba0ac3 | 848 | pim_ifp->t_pim_sock_read = NULL; |
12e41d03 DL |
849 | pim_ifp->pim_sock_creation = pim_time_monotonic_sec(); |
850 | ||
c29c0f61 DS |
851 | /* |
852 | * Just ensure that the new generation id | |
853 | * actually chooses something different. | |
854 | * Actually ran across a case where this | |
855 | * happened, pre-switch to random(). | |
856 | * While this is unlikely to happen now | |
857 | * let's make sure it doesn't. | |
858 | */ | |
859 | old_genid = pim_ifp->pim_generation_id; | |
860 | ||
861 | while (old_genid == pim_ifp->pim_generation_id) | |
862 | pim_ifp->pim_generation_id = random(); | |
12e41d03 DL |
863 | |
864 | zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d", | |
865 | ifp->name, ifp->ifindex); | |
866 | ||
867 | /* | |
868 | * Start receiving PIM messages | |
869 | */ | |
870 | pim_sock_read_on(ifp); | |
871 | ||
872 | /* | |
873 | * Start sending PIM hello's | |
874 | */ | |
875 | pim_hello_restart_triggered(ifp); | |
876 | ||
877 | return 0; | |
878 | } |