]>
Commit | Line | Data |
---|---|---|
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 */ | |
eaa54bdb DW |
135 | char src_str[INET_ADDRSTRLEN]; |
136 | char dst_str[INET_ADDRSTRLEN]; | |
12e41d03 DL |
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 | ||
12e41d03 | 145 | if (len < sizeof(*ip_hdr)) { |
def1e807 DS |
146 | if (PIM_DEBUG_PIM_PACKETS) |
147 | zlog_debug("PIM packet size=%zu shorter than minimum=%zu", | |
148 | len, sizeof(*ip_hdr)); | |
12e41d03 DL |
149 | return -1; |
150 | } | |
151 | ||
152 | ip_hdr = (struct ip *) buf; | |
12e41d03 DL |
153 | ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */ |
154 | ||
12e41d03 | 155 | if (ip_hdr->ip_p != PIM_IP_PROTO_PIM) { |
def1e807 DS |
156 | if (PIM_DEBUG_PIM_PACKETS) |
157 | zlog_debug("IP packet protocol=%d is not PIM=%d", | |
158 | ip_hdr->ip_p, PIM_IP_PROTO_PIM); | |
12e41d03 DL |
159 | return -1; |
160 | } | |
161 | ||
162 | if (ip_hlen < PIM_IP_HEADER_MIN_LEN) { | |
def1e807 DS |
163 | if (PIM_DEBUG_PIM_PACKETS) |
164 | zlog_debug("IP packet header size=%zu shorter than minimum=%d", | |
0f055c0d | 165 | ip_hlen, PIM_IP_HEADER_MIN_LEN); |
12e41d03 DL |
166 | return -1; |
167 | } | |
168 | if (ip_hlen > PIM_IP_HEADER_MAX_LEN) { | |
def1e807 DS |
169 | if (PIM_DEBUG_PIM_PACKETS) |
170 | zlog_debug("IP packet header size=%zu greater than maximum=%d", | |
0f055c0d | 171 | ip_hlen, PIM_IP_HEADER_MAX_LEN); |
12e41d03 DL |
172 | return -1; |
173 | } | |
174 | ||
175 | pim_msg = buf + ip_hlen; | |
176 | pim_msg_len = len - ip_hlen; | |
177 | ||
12e41d03 | 178 | if (pim_msg_len < PIM_PIM_MIN_LEN) { |
0f055c0d DS |
179 | if (PIM_DEBUG_PIM_PACKETS) |
180 | zlog_debug("PIM message size=%d shorter than minimum=%d", | |
181 | pim_msg_len, PIM_PIM_MIN_LEN); | |
12e41d03 DL |
182 | return -1; |
183 | } | |
184 | ||
185 | pim_version = PIM_MSG_HDR_GET_VERSION(pim_msg); | |
186 | pim_type = PIM_MSG_HDR_GET_TYPE(pim_msg); | |
187 | ||
188 | if (pim_version != PIM_PROTO_VERSION) { | |
def1e807 DS |
189 | if (PIM_DEBUG_PIM_PACKETS) |
190 | zlog_debug("Ignoring PIM pkt from %s with unsupported version: %d", | |
191 | ifp->name, pim_version); | |
12e41d03 DL |
192 | return -1; |
193 | } | |
194 | ||
195 | /* save received checksum */ | |
196 | pim_checksum = PIM_MSG_HDR_GET_CHECKSUM(pim_msg); | |
197 | ||
198 | /* for computing checksum */ | |
199 | *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = 0; | |
200 | ||
201 | checksum = in_cksum(pim_msg, pim_msg_len); | |
202 | if (checksum != pim_checksum) { | |
def1e807 DS |
203 | if (PIM_DEBUG_PIM_PACKETS) |
204 | zlog_debug("Ignoring PIM pkt from %s with invalid checksum: received=%x calculated=%x", | |
205 | ifp->name, pim_checksum, checksum); | |
12e41d03 DL |
206 | return -1; |
207 | } | |
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 DS |
212 | zlog_debug("Recv PIM %s packet from %s to %s on %s: ttl=%d pim_version=%d pim_msg_size=%d checksum=%x", |
213 | pim_pim_msgtype2str (pim_type), src_str, dst_str, ifp->name, | |
214 | ip_hdr->ip_ttl, pim_version, 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 | ||
4dffc880 | 220 | switch (pim_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__, | |
245 | pim_type, src_str, ifp->name); | |
4dffc880 DS |
246 | return -1; |
247 | } | |
248 | return pim_joinprune_recv(ifp, neigh, | |
249 | ip_hdr->ip_src, | |
250 | pim_msg + PIM_MSG_HEADER_LEN, | |
251 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
252 | break; | |
253 | case PIM_MSG_TYPE_ASSERT: | |
254 | neigh = pim_neighbor_find(ifp, ip_hdr->ip_src); | |
255 | if (!neigh) { | |
def1e807 DS |
256 | if (PIM_DEBUG_PIM_PACKETS) |
257 | zlog_debug("%s %s: non-hello PIM message type=%d from non-neighbor %s on %s", | |
258 | __FILE__, __PRETTY_FUNCTION__, | |
259 | pim_type, src_str, ifp->name); | |
4dffc880 DS |
260 | return -1; |
261 | } | |
262 | return pim_assert_recv(ifp, neigh, | |
263 | ip_hdr->ip_src, | |
264 | pim_msg + PIM_MSG_HEADER_LEN, | |
265 | pim_msg_len - PIM_MSG_HEADER_LEN); | |
266 | break; | |
267 | default: | |
566b83cf DS |
268 | if (PIM_DEBUG_PIM_PACKETS) { |
269 | zlog_debug("Recv PIM packet type %d which is not currently understood", | |
270 | pim_type); | |
271 | } | |
272 | return -1; | |
273 | } | |
12e41d03 DL |
274 | return -1; |
275 | } | |
276 | ||
277 | static void pim_sock_read_on(struct interface *ifp); | |
278 | ||
279 | static int pim_sock_read(struct thread *t) | |
280 | { | |
281 | struct interface *ifp; | |
282 | struct pim_interface *pim_ifp; | |
283 | int fd; | |
284 | struct sockaddr_in from; | |
285 | struct sockaddr_in to; | |
286 | socklen_t fromlen = sizeof(from); | |
287 | socklen_t tolen = sizeof(to); | |
288 | uint8_t buf[PIM_PIM_BUFSIZE_READ]; | |
289 | int len; | |
b892f1dd | 290 | ifindex_t ifindex = -1; |
12e41d03 | 291 | int result = -1; /* defaults to bad */ |
db48bcb2 DS |
292 | static long long count = 0; |
293 | int cont = 1; | |
12e41d03 | 294 | |
12e41d03 | 295 | ifp = THREAD_ARG(t); |
12e41d03 DL |
296 | fd = THREAD_FD(t); |
297 | ||
298 | pim_ifp = ifp->info; | |
12e41d03 | 299 | |
db48bcb2 DS |
300 | while (cont) |
301 | { | |
302 | len = pim_socket_recvfromto(fd, buf, sizeof(buf), | |
303 | &from, &fromlen, | |
304 | &to, &tolen, | |
305 | &ifindex); | |
306 | if (len < 0) | |
307 | { | |
308 | if (errno == EINTR) | |
309 | continue; | |
310 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
311 | { | |
312 | cont = 0; | |
313 | break; | |
314 | } | |
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 | ||
332 | recv_ifp = if_lookup_by_index(ifindex); | |
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++; | |
356 | if (count % 3 == 0) | |
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 | zassert(!pim_ifp->t_pim_sock_read); |
387 | THREAD_READ_ON(master, pim_ifp->t_pim_sock_read, pim_sock_read, ifp, | |
388 | pim_ifp->pim_sock_fd); | |
389 | } | |
390 | ||
b892f1dd | 391 | static int pim_sock_open(struct in_addr ifaddr, ifindex_t ifindex) |
12e41d03 DL |
392 | { |
393 | int fd; | |
394 | ||
61ea3951 | 395 | fd = pim_socket_mcast(IPPROTO_PIM, ifaddr, ifindex, 0 /* loop=false */); |
12e41d03 DL |
396 | if (fd < 0) |
397 | return -1; | |
398 | ||
399 | if (pim_socket_join(fd, qpim_all_pim_routers_addr, ifaddr, 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: | |
509 | pim_inet4_dump ("<dst?>", ip->ip_dst, dst_str, sizeof (dst_str)); | |
510 | zlog_warn ("%s: sendto() failure to %s: fd=%d msg_size=%zd: errno=%d: %s", | |
511 | __PRETTY_FUNCTION__, | |
512 | dst_str, fd, len, | |
513 | errno, safe_strerror(errno)); | |
c305ed63 | 514 | return -1; |
29444f8f | 515 | break; |
c305ed63 DS |
516 | } |
517 | } | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | int | |
523 | pim_msg_send(int fd, struct in_addr src, | |
524 | struct in_addr dst, uint8_t *pim_msg, | |
525 | int pim_msg_size, const char *ifname) | |
12e41d03 | 526 | { |
12e41d03 DL |
527 | struct sockaddr_in to; |
528 | socklen_t tolen; | |
19e55095 | 529 | unsigned char buffer[10000]; |
4df01a4e DS |
530 | unsigned char *msg_start; |
531 | struct ip *ip; | |
532 | ||
19e55095 | 533 | memset (buffer, 0, 10000); |
4df01a4e DS |
534 | int sendlen = sizeof (struct ip) + pim_msg_size; |
535 | ||
536 | msg_start = buffer + sizeof (struct ip); | |
537 | memcpy (msg_start, pim_msg, pim_msg_size); | |
538 | ||
539 | ip = (struct ip *)buffer; | |
540 | ip->ip_id = htons (++ip_id); | |
541 | ip->ip_hl = 5; | |
542 | ip->ip_v = 4; | |
543 | ip->ip_p = PIM_IP_PROTO_PIM; | |
544 | ip->ip_src = src; | |
545 | ip->ip_dst = dst; | |
546 | ip->ip_ttl = MAXTTL; | |
547 | ip->ip_len = htons (sendlen); | |
12e41d03 DL |
548 | |
549 | if (PIM_DEBUG_PIM_PACKETS) { | |
eaa54bdb | 550 | char dst_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
551 | pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str)); |
552 | zlog_debug("%s: to %s on %s: msg_size=%d checksum=%x", | |
553 | __PRETTY_FUNCTION__, | |
554 | dst_str, ifname, pim_msg_size, | |
555 | *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg)); | |
556 | } | |
557 | ||
12e41d03 | 558 | memset(&to, 0, sizeof(to)); |
12e41d03 DL |
559 | to.sin_family = AF_INET; |
560 | to.sin_addr = dst; | |
12e41d03 DL |
561 | tolen = sizeof(to); |
562 | ||
563 | if (PIM_DEBUG_PIM_PACKETDUMP_SEND) { | |
564 | pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_size); | |
565 | } | |
566 | ||
c305ed63 DS |
567 | pim_msg_send_frame (fd, (char *)buffer, sendlen, |
568 | (struct sockaddr *)&to, tolen); | |
12e41d03 DL |
569 | return 0; |
570 | } | |
571 | ||
572 | static int hello_send(struct interface *ifp, | |
573 | uint16_t holdtime) | |
574 | { | |
575 | uint8_t pim_msg[PIM_PIM_BUFSIZE_WRITE]; | |
576 | struct pim_interface *pim_ifp; | |
577 | int pim_tlv_size; | |
578 | int pim_msg_size; | |
579 | ||
580 | pim_ifp = ifp->info; | |
581 | ||
aea6cb94 | 582 | if (PIM_DEBUG_PIM_HELLO) { |
eaa54bdb | 583 | char dst_str[INET_ADDRSTRLEN]; |
12e41d03 DL |
584 | pim_inet4_dump("<dst?>", qpim_all_pim_routers_addr, dst_str, sizeof(dst_str)); |
585 | 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", | |
586 | __PRETTY_FUNCTION__, | |
587 | dst_str, ifp->name, | |
588 | holdtime, | |
589 | pim_ifp->pim_propagation_delay_msec, pim_ifp->pim_override_interval_msec, | |
590 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options), | |
591 | pim_ifp->pim_dr_priority, pim_ifp->pim_generation_id, | |
592 | listcount(ifp->connected)); | |
593 | } | |
594 | ||
595 | pim_tlv_size = pim_hello_build_tlv(ifp->name, | |
596 | pim_msg + PIM_PIM_MIN_LEN, | |
597 | sizeof(pim_msg) - PIM_PIM_MIN_LEN, | |
598 | holdtime, | |
599 | pim_ifp->pim_dr_priority, | |
600 | pim_ifp->pim_generation_id, | |
601 | pim_ifp->pim_propagation_delay_msec, | |
602 | pim_ifp->pim_override_interval_msec, | |
603 | PIM_IF_TEST_PIM_CAN_DISABLE_JOIN_SUPRESSION(pim_ifp->options), | |
604 | ifp->connected); | |
605 | if (pim_tlv_size < 0) { | |
606 | return -1; | |
607 | } | |
608 | ||
609 | pim_msg_size = pim_tlv_size + PIM_PIM_MIN_LEN; | |
610 | ||
611 | zassert(pim_msg_size >= PIM_PIM_MIN_LEN); | |
612 | zassert(pim_msg_size <= PIM_PIM_BUFSIZE_WRITE); | |
613 | ||
614 | pim_msg_build_header(pim_msg, pim_msg_size, | |
615 | PIM_MSG_TYPE_HELLO); | |
616 | ||
617 | if (pim_msg_send(pim_ifp->pim_sock_fd, | |
4df01a4e | 618 | pim_ifp->primary_address, |
12e41d03 DL |
619 | qpim_all_pim_routers_addr, |
620 | pim_msg, | |
621 | pim_msg_size, | |
622 | ifp->name)) { | |
aea6cb94 DS |
623 | if (PIM_DEBUG_PIM_HELLO) { |
624 | zlog_debug("%s: could not send PIM message on interface %s", | |
625 | __PRETTY_FUNCTION__, ifp->name); | |
626 | } | |
12e41d03 DL |
627 | return -2; |
628 | } | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | static int pim_hello_send(struct interface *ifp, | |
634 | uint16_t holdtime) | |
635 | { | |
636 | struct pim_interface *pim_ifp; | |
637 | ||
638 | zassert(ifp); | |
639 | pim_ifp = ifp->info; | |
640 | zassert(pim_ifp); | |
641 | ||
85b62aea DS |
642 | if (if_is_loopback (ifp)) |
643 | return 0; | |
644 | ||
12e41d03 DL |
645 | if (hello_send(ifp, holdtime)) { |
646 | ++pim_ifp->pim_ifstat_hello_sendfail; | |
647 | ||
aea6cb94 DS |
648 | if (PIM_DEBUG_PIM_HELLO) { |
649 | zlog_warn("Could not send PIM hello on interface %s", | |
650 | ifp->name); | |
651 | } | |
12e41d03 DL |
652 | return -1; |
653 | } | |
654 | ||
655 | ++pim_ifp->pim_ifstat_hello_sent; | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | static void hello_resched(struct interface *ifp) | |
661 | { | |
662 | struct pim_interface *pim_ifp; | |
663 | ||
664 | zassert(ifp); | |
665 | pim_ifp = ifp->info; | |
666 | zassert(pim_ifp); | |
667 | ||
aea6cb94 | 668 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
669 | zlog_debug("Rescheduling %d sec hello on interface %s", |
670 | pim_ifp->pim_hello_period, ifp->name); | |
671 | } | |
672 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
673 | THREAD_TIMER_ON(master, pim_ifp->t_pim_hello_timer, | |
674 | on_pim_hello_send, | |
675 | ifp, pim_ifp->pim_hello_period); | |
676 | } | |
677 | ||
678 | /* | |
679 | Periodic hello timer | |
680 | */ | |
681 | static int on_pim_hello_send(struct thread *t) | |
682 | { | |
683 | struct pim_interface *pim_ifp; | |
684 | struct interface *ifp; | |
685 | ||
12e41d03 | 686 | ifp = THREAD_ARG(t); |
12e41d03 DL |
687 | |
688 | pim_ifp = ifp->info; | |
689 | ||
690 | /* | |
691 | * Schedule next hello | |
692 | */ | |
59ba0ac3 | 693 | pim_ifp->t_pim_hello_timer = NULL; |
12e41d03 DL |
694 | hello_resched(ifp); |
695 | ||
696 | /* | |
697 | * Send hello | |
698 | */ | |
699 | return pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
700 | } | |
701 | ||
702 | /* | |
703 | RFC 4601: 4.3.1. Sending Hello Messages | |
704 | ||
705 | Thus, if a router needs to send a Join/Prune or Assert message on an | |
706 | interface on which it has not yet sent a Hello message with the | |
707 | currently configured IP address, then it MUST immediately send the | |
708 | relevant Hello message without waiting for the Hello Timer to | |
709 | expire, followed by the Join/Prune or Assert message. | |
710 | */ | |
711 | void pim_hello_restart_now(struct interface *ifp) | |
712 | { | |
713 | struct pim_interface *pim_ifp; | |
714 | ||
715 | zassert(ifp); | |
716 | pim_ifp = ifp->info; | |
717 | zassert(pim_ifp); | |
718 | ||
719 | /* | |
720 | * Reset next hello timer | |
721 | */ | |
722 | hello_resched(ifp); | |
723 | ||
724 | /* | |
725 | * Immediately send hello | |
726 | */ | |
727 | pim_hello_send(ifp, PIM_IF_DEFAULT_HOLDTIME(pim_ifp)); | |
728 | } | |
729 | ||
730 | /* | |
731 | RFC 4601: 4.3.1. Sending Hello Messages | |
732 | ||
733 | To allow new or rebooting routers to learn of PIM neighbors quickly, | |
734 | when a Hello message is received from a new neighbor, or a Hello | |
735 | message with a new GenID is received from an existing neighbor, a | |
736 | new Hello message should be sent on this interface after a | |
737 | randomized delay between 0 and Triggered_Hello_Delay. | |
738 | */ | |
739 | void pim_hello_restart_triggered(struct interface *ifp) | |
740 | { | |
741 | struct pim_interface *pim_ifp; | |
742 | int triggered_hello_delay_msec; | |
743 | int random_msec; | |
744 | ||
745 | zassert(ifp); | |
746 | pim_ifp = ifp->info; | |
747 | zassert(pim_ifp); | |
748 | ||
749 | triggered_hello_delay_msec = 1000 * pim_ifp->pim_triggered_hello_delay; | |
750 | ||
751 | if (pim_ifp->t_pim_hello_timer) { | |
752 | long remain_msec = pim_time_timer_remain_msec(pim_ifp->t_pim_hello_timer); | |
753 | if (remain_msec <= triggered_hello_delay_msec) { | |
754 | /* Rescheduling hello would increase the delay, then it's faster | |
755 | to just wait for the scheduled periodic hello. */ | |
756 | return; | |
757 | } | |
758 | ||
759 | THREAD_OFF(pim_ifp->t_pim_hello_timer); | |
59ba0ac3 | 760 | pim_ifp->t_pim_hello_timer = NULL; |
12e41d03 | 761 | } |
12e41d03 | 762 | |
60b40924 | 763 | random_msec = random() % (triggered_hello_delay_msec + 1); |
12e41d03 | 764 | |
aea6cb94 | 765 | if (PIM_DEBUG_PIM_HELLO) { |
12e41d03 DL |
766 | zlog_debug("Scheduling %d msec triggered hello on interface %s", |
767 | random_msec, ifp->name); | |
768 | } | |
769 | ||
770 | THREAD_TIMER_MSEC_ON(master, pim_ifp->t_pim_hello_timer, | |
771 | on_pim_hello_send, | |
772 | ifp, random_msec); | |
773 | } | |
774 | ||
775 | int pim_sock_add(struct interface *ifp) | |
776 | { | |
777 | struct pim_interface *pim_ifp; | |
778 | struct in_addr ifaddr; | |
c29c0f61 | 779 | uint32_t old_genid; |
12e41d03 DL |
780 | |
781 | pim_ifp = ifp->info; | |
782 | zassert(pim_ifp); | |
783 | ||
784 | if (pim_ifp->pim_sock_fd >= 0) { | |
def1e807 DS |
785 | if (PIM_DEBUG_PIM_PACKETS) |
786 | zlog_debug("Can't recreate existing PIM socket fd=%d for interface %s", | |
787 | pim_ifp->pim_sock_fd, ifp->name); | |
12e41d03 DL |
788 | return -1; |
789 | } | |
790 | ||
791 | ifaddr = pim_ifp->primary_address; | |
792 | ||
793 | pim_ifp->pim_sock_fd = pim_sock_open(ifaddr, ifp->ifindex); | |
794 | if (pim_ifp->pim_sock_fd < 0) { | |
def1e807 DS |
795 | if (PIM_DEBUG_PIM_PACKETS) |
796 | zlog_debug("Could not open PIM socket on interface %s", | |
797 | ifp->name); | |
12e41d03 DL |
798 | return -2; |
799 | } | |
800 | ||
4df01a4e DS |
801 | pim_socket_ip_hdr (pim_ifp->pim_sock_fd); |
802 | ||
59ba0ac3 | 803 | pim_ifp->t_pim_sock_read = NULL; |
12e41d03 DL |
804 | pim_ifp->pim_sock_creation = pim_time_monotonic_sec(); |
805 | ||
c29c0f61 DS |
806 | /* |
807 | * Just ensure that the new generation id | |
808 | * actually chooses something different. | |
809 | * Actually ran across a case where this | |
810 | * happened, pre-switch to random(). | |
811 | * While this is unlikely to happen now | |
812 | * let's make sure it doesn't. | |
813 | */ | |
814 | old_genid = pim_ifp->pim_generation_id; | |
815 | ||
816 | while (old_genid == pim_ifp->pim_generation_id) | |
817 | pim_ifp->pim_generation_id = random(); | |
12e41d03 DL |
818 | |
819 | zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d", | |
820 | ifp->name, ifp->ifindex); | |
821 | ||
822 | /* | |
823 | * Start receiving PIM messages | |
824 | */ | |
825 | pim_sock_read_on(ifp); | |
826 | ||
827 | /* | |
828 | * Start sending PIM hello's | |
829 | */ | |
830 | pim_hello_restart_triggered(ifp); | |
831 | ||
832 | return 0; | |
833 | } |