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e9e2c950 RZ |
1 | /********************************************************************* |
2 | * Copyright 2017 Cumulus Networks, Inc. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; either version 2 of the License, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; see the file COPYING; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | * | |
18 | * bfd_packet.c: implements the BFD protocol packet handling. | |
19 | * | |
20 | * Authors | |
21 | * ------- | |
22 | * Shrijeet Mukherjee [shm@cumulusnetworks.com] | |
23 | * Kanna Rajagopal [kanna@cumulusnetworks.com] | |
24 | * Radhika Mahankali [Radhika@cumulusnetworks.com] | |
25 | */ | |
26 | ||
27 | #include <zebra.h> | |
28 | ||
29 | #ifdef BFD_LINUX | |
30 | #include <linux/if_packet.h> | |
31 | #endif /* BFD_LINUX */ | |
32 | ||
e9e2c950 | 33 | #include <netinet/if_ether.h> |
e9e2c950 | 34 | #include <netinet/udp.h> |
e9e2c950 RZ |
35 | |
36 | #include "lib/sockopt.h" | |
37 | ||
38 | #include "bfd.h" | |
39 | ||
8a9f760e | 40 | |
e9e2c950 RZ |
41 | /* |
42 | * Prototypes | |
43 | */ | |
e9e2c950 | 44 | static int ptm_bfd_process_echo_pkt(int s); |
2f11c53f RZ |
45 | int _ptm_bfd_send(struct bfd_session *bs, uint16_t *port, const void *data, |
46 | size_t datalen); | |
e9e2c950 RZ |
47 | |
48 | static void bfd_sd_reschedule(int sd); | |
50571b2e RZ |
49 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
50 | char *port, size_t portlen, char *vrfname, | |
51 | size_t vrfnamelen, struct sockaddr_any *local, | |
52 | struct sockaddr_any *peer); | |
53 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, | |
54 | char *port, size_t portlen, char *vrfname, | |
55 | size_t vrfnamelen, struct sockaddr_any *local, | |
56 | struct sockaddr_any *peer); | |
2f11c53f RZ |
57 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, |
58 | struct sockaddr *to, socklen_t tolen); | |
59 | int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr); | |
e9e2c950 RZ |
60 | |
61 | /* socket related prototypes */ | |
62 | static void bp_set_ipopts(int sd); | |
63 | static void bp_bind_ip(int sd, uint16_t port); | |
64 | static void bp_set_ipv6opts(int sd); | |
65 | static void bp_bind_ipv6(int sd, uint16_t port); | |
66 | ||
67 | ||
68 | /* | |
69 | * Functions | |
70 | */ | |
2f11c53f RZ |
71 | int _ptm_bfd_send(struct bfd_session *bs, uint16_t *port, const void *data, |
72 | size_t datalen) | |
e9e2c950 RZ |
73 | { |
74 | struct sockaddr *sa; | |
75 | struct sockaddr_in sin; | |
76 | struct sockaddr_in6 sin6; | |
e9e2c950 RZ |
77 | socklen_t slen; |
78 | ssize_t rv; | |
79 | int sd = -1; | |
80 | ||
2f11c53f | 81 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6)) { |
e9e2c950 RZ |
82 | memset(&sin6, 0, sizeof(sin6)); |
83 | sin6.sin6_family = AF_INET6; | |
84 | sin6.sin6_addr = bs->shop.peer.sa_sin6.sin6_addr; | |
85 | sin6.sin6_port = | |
86 | (port) ? *port | |
87 | : (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) | |
88 | ? htons(BFD_DEF_MHOP_DEST_PORT) | |
89 | : htons(BFD_DEFDESTPORT); | |
90 | ||
91 | sd = bs->sock; | |
92 | sa = (struct sockaddr *)&sin6; | |
93 | slen = sizeof(sin6); | |
94 | } else { | |
95 | memset(&sin, 0, sizeof(sin)); | |
96 | sin.sin_family = AF_INET; | |
97 | sin.sin_addr = bs->shop.peer.sa_sin.sin_addr; | |
98 | sin.sin_port = | |
99 | (port) ? *port | |
100 | : (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) | |
101 | ? htons(BFD_DEF_MHOP_DEST_PORT) | |
102 | : htons(BFD_DEFDESTPORT); | |
103 | ||
104 | sd = bs->sock; | |
105 | sa = (struct sockaddr *)&sin; | |
106 | slen = sizeof(sin); | |
107 | } | |
108 | ||
109 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
110 | sa->sa_len = slen; | |
111 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
112 | rv = sendto(sd, data, datalen, 0, sa, slen); | |
113 | if (rv <= 0) { | |
03e7f088 | 114 | log_debug("packet-send: send failure: %s", strerror(errno)); |
e9e2c950 RZ |
115 | return -1; |
116 | } | |
03e7f088 RZ |
117 | if (rv < (ssize_t)datalen) |
118 | log_debug("packet-send: send partial", strerror(errno)); | |
e9e2c950 RZ |
119 | |
120 | return 0; | |
121 | } | |
122 | ||
e9e2c950 RZ |
123 | void ptm_bfd_echo_snd(struct bfd_session *bfd) |
124 | { | |
2f11c53f RZ |
125 | struct sockaddr_any *sa; |
126 | socklen_t salen; | |
127 | int sd; | |
128 | struct bfd_echo_pkt bep; | |
129 | struct sockaddr_in sin; | |
130 | struct sockaddr_in6 sin6; | |
e9e2c950 | 131 | |
2f11c53f | 132 | if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) |
e9e2c950 | 133 | BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE); |
e9e2c950 | 134 | |
2f11c53f RZ |
135 | memset(&bep, 0, sizeof(bep)); |
136 | bep.ver = BFD_ECHO_VERSION; | |
137 | bep.len = BFD_ECHO_PKT_LEN; | |
138 | bep.my_discr = htonl(bfd->discrs.my_discr); | |
139 | ||
140 | sa = BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_MH) ? &bfd->mhop.peer | |
141 | : &bfd->shop.peer; | |
142 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_IPV6)) { | |
143 | sd = bglobal.bg_echov6; | |
144 | sin6 = sa->sa_sin6; | |
145 | sin6.sin6_port = htons(BFD_DEF_ECHO_PORT); | |
146 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
147 | sin6.sin6_len = sizeof(sin6); | |
148 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
149 | ||
150 | sa = (struct sockaddr_any *)&sin6; | |
151 | salen = sizeof(sin6); | |
e9e2c950 | 152 | } else { |
2f11c53f RZ |
153 | sd = bglobal.bg_echo; |
154 | sin = sa->sa_sin; | |
155 | sin.sin_port = htons(BFD_DEF_ECHO_PORT); | |
156 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
157 | sin.sin_len = sizeof(sin); | |
158 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 | 159 | |
2f11c53f RZ |
160 | sa = (struct sockaddr_any *)&sin; |
161 | salen = sizeof(sin); | |
e9e2c950 | 162 | } |
2f11c53f RZ |
163 | if (bp_udp_send(sd, BFD_TTL_VAL, (uint8_t *)&bep, sizeof(bep), |
164 | (struct sockaddr *)sa, salen) | |
165 | == -1) | |
166 | return; | |
e9e2c950 RZ |
167 | |
168 | bfd->stats.tx_echo_pkt++; | |
169 | } | |
170 | ||
e9e2c950 RZ |
171 | static int ptm_bfd_process_echo_pkt(int s) |
172 | { | |
e9e2c950 | 173 | struct bfd_session *bfd; |
2f11c53f RZ |
174 | uint32_t my_discr = 0; |
175 | uint8_t ttl = 0; | |
e9e2c950 | 176 | |
2f11c53f RZ |
177 | /* Receive and parse echo packet. */ |
178 | if (bp_bfd_echo_in(s, &ttl, &my_discr) == -1) | |
179 | return 0; | |
e9e2c950 RZ |
180 | |
181 | /* Your discriminator not zero - use it to find session */ | |
182 | bfd = bfd_id_lookup(my_discr); | |
183 | if (bfd == NULL) { | |
03e7f088 | 184 | log_debug("echo-packet: no matching session (id:%u)", my_discr); |
e9e2c950 RZ |
185 | return -1; |
186 | } | |
187 | ||
188 | if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) { | |
9835f17d RZ |
189 | log_debug("echo-packet: echo disabled [%s] (id:%u)", |
190 | bs_to_string(bfd), my_discr); | |
e9e2c950 RZ |
191 | return -1; |
192 | } | |
193 | ||
194 | bfd->stats.rx_echo_pkt++; | |
195 | ||
196 | /* Compute detect time */ | |
197 | bfd->echo_detect_TO = bfd->remote_detect_mult * bfd->echo_xmt_TO; | |
198 | ||
199 | /* Update echo receive timeout. */ | |
451eb5a2 RZ |
200 | if (bfd->echo_detect_TO > 0) |
201 | bfd_echo_recvtimer_update(bfd); | |
e9e2c950 RZ |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
206 | void ptm_bfd_snd(struct bfd_session *bfd, int fbit) | |
207 | { | |
208 | struct bfd_pkt cp; | |
209 | ||
e9e2c950 RZ |
210 | /* Set fields according to section 6.5.7 */ |
211 | cp.diag = bfd->local_diag; | |
212 | BFD_SETVER(cp.diag, BFD_VERSION); | |
213 | cp.flags = 0; | |
214 | BFD_SETSTATE(cp.flags, bfd->ses_state); | |
215 | BFD_SETDEMANDBIT(cp.flags, BFD_DEF_DEMAND); | |
216 | BFD_SETPBIT(cp.flags, bfd->polling); | |
217 | BFD_SETFBIT(cp.flags, fbit); | |
218 | cp.detect_mult = bfd->detect_mult; | |
219 | cp.len = BFD_PKT_LEN; | |
220 | cp.discrs.my_discr = htonl(bfd->discrs.my_discr); | |
221 | cp.discrs.remote_discr = htonl(bfd->discrs.remote_discr); | |
222 | if (bfd->polling) { | |
223 | cp.timers.desired_min_tx = | |
224 | htonl(bfd->new_timers.desired_min_tx); | |
225 | cp.timers.required_min_rx = | |
226 | htonl(bfd->new_timers.required_min_rx); | |
227 | } else { | |
228 | cp.timers.desired_min_tx = htonl(bfd->timers.desired_min_tx); | |
229 | cp.timers.required_min_rx = htonl(bfd->timers.required_min_rx); | |
230 | } | |
231 | cp.timers.required_min_echo = htonl(bfd->timers.required_min_echo); | |
232 | ||
2f11c53f | 233 | if (_ptm_bfd_send(bfd, NULL, &cp, BFD_PKT_LEN) != 0) |
e9e2c950 | 234 | return; |
e9e2c950 RZ |
235 | |
236 | bfd->stats.tx_ctrl_pkt++; | |
237 | } | |
238 | ||
50571b2e RZ |
239 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
240 | char *port, size_t portlen, char *vrfname, | |
241 | size_t vrfnamelen, struct sockaddr_any *local, | |
242 | struct sockaddr_any *peer) | |
e9e2c950 RZ |
243 | { |
244 | struct cmsghdr *cm; | |
245 | int ifindex; | |
246 | ssize_t mlen; | |
16084964 RZ |
247 | struct sockaddr_in msgaddr; |
248 | struct msghdr msghdr; | |
249 | struct iovec iov[1]; | |
250 | uint8_t cmsgbuf[255]; | |
251 | ||
e10cfdaf DL |
252 | port[0] = '\0'; |
253 | ||
16084964 RZ |
254 | /* Prepare the recvmsg params. */ |
255 | iov[0].iov_base = msgbuf; | |
50571b2e | 256 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
257 | |
258 | memset(&msghdr, 0, sizeof(msghdr)); | |
259 | msghdr.msg_name = &msgaddr; | |
260 | msghdr.msg_namelen = sizeof(msgaddr); | |
261 | msghdr.msg_iov = iov; | |
262 | msghdr.msg_iovlen = 1; | |
263 | msghdr.msg_control = cmsgbuf; | |
264 | msghdr.msg_controllen = sizeof(cmsgbuf); | |
265 | ||
e9e2c950 RZ |
266 | mlen = recvmsg(sd, &msghdr, MSG_DONTWAIT); |
267 | if (mlen == -1) { | |
03e7f088 RZ |
268 | if (errno != EAGAIN) |
269 | log_error("ipv4-recv: recv failed: %s", | |
270 | strerror(errno)); | |
271 | ||
e9e2c950 RZ |
272 | return -1; |
273 | } | |
274 | ||
275 | /* Get source address */ | |
276 | peer->sa_sin = *((struct sockaddr_in *)(msghdr.msg_name)); | |
277 | ||
278 | /* Get and check TTL */ | |
279 | for (cm = CMSG_FIRSTHDR(&msghdr); cm != NULL; | |
280 | cm = CMSG_NXTHDR(&msghdr, cm)) { | |
281 | if (cm->cmsg_level != IPPROTO_IP) | |
282 | continue; | |
283 | ||
284 | switch (cm->cmsg_type) { | |
285 | #ifdef BFD_LINUX | |
286 | case IP_TTL: { | |
50571b2e RZ |
287 | uint32_t ttlval; |
288 | ||
289 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); | |
290 | if (ttlval > 255) { | |
291 | log_debug("ipv4-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
292 | return -1; |
293 | } | |
50571b2e | 294 | *ttl = ttlval; |
e9e2c950 RZ |
295 | break; |
296 | } | |
297 | ||
298 | case IP_PKTINFO: { | |
299 | struct in_pktinfo *pi = | |
300 | (struct in_pktinfo *)CMSG_DATA(cm); | |
301 | ||
302 | if (pi == NULL) | |
303 | break; | |
304 | ||
305 | local->sa_sin.sin_family = AF_INET; | |
306 | local->sa_sin.sin_addr = pi->ipi_addr; | |
307 | fetch_portname_from_ifindex(pi->ipi_ifindex, port, | |
308 | portlen); | |
309 | break; | |
310 | } | |
311 | #endif /* BFD_LINUX */ | |
312 | #ifdef BFD_BSD | |
313 | case IP_RECVTTL: { | |
50571b2e | 314 | memcpy(ttl, CMSG_DATA(cm), sizeof(*ttl)); |
e9e2c950 RZ |
315 | break; |
316 | } | |
317 | ||
318 | case IP_RECVDSTADDR: { | |
319 | struct in_addr ia; | |
320 | ||
321 | memcpy(&ia, CMSG_DATA(cm), sizeof(ia)); | |
322 | local->sa_sin.sin_family = AF_INET; | |
323 | local->sa_sin.sin_addr = ia; | |
324 | break; | |
325 | } | |
326 | #endif /* BFD_BSD */ | |
327 | ||
328 | default: | |
329 | /* | |
330 | * On *BSDs we expect to land here when skipping | |
331 | * the IP_RECVIF header. It will be handled by | |
332 | * getsockopt_ifindex() below. | |
333 | */ | |
334 | /* NOTHING */ | |
335 | break; | |
336 | } | |
337 | } | |
338 | ||
339 | /* OS agnostic way of getting interface name. */ | |
340 | if (port[0] == 0) { | |
341 | ifindex = getsockopt_ifindex(AF_INET, &msghdr); | |
342 | if (ifindex > 0) | |
343 | fetch_portname_from_ifindex(ifindex, port, portlen); | |
344 | } | |
345 | ||
346 | return mlen; | |
347 | } | |
348 | ||
50571b2e RZ |
349 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
350 | char *port, size_t portlen, char *vrfname, | |
351 | size_t vrfnamelen, struct sockaddr_any *local, | |
352 | struct sockaddr_any *peer) | |
e9e2c950 RZ |
353 | { |
354 | struct cmsghdr *cm; | |
355 | struct in6_pktinfo *pi6 = NULL; | |
43adc702 | 356 | int ifindex = 0; |
e9e2c950 | 357 | ssize_t mlen; |
6e01e275 | 358 | uint32_t ttlval; |
16084964 RZ |
359 | struct sockaddr_in6 msgaddr6; |
360 | struct msghdr msghdr6; | |
361 | struct iovec iov[1]; | |
362 | uint8_t cmsgbuf6[255]; | |
363 | ||
364 | /* Prepare the recvmsg params. */ | |
365 | iov[0].iov_base = msgbuf; | |
50571b2e | 366 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
367 | |
368 | memset(&msghdr6, 0, sizeof(msghdr6)); | |
369 | msghdr6.msg_name = &msgaddr6; | |
370 | msghdr6.msg_namelen = sizeof(msgaddr6); | |
371 | msghdr6.msg_iov = iov; | |
372 | msghdr6.msg_iovlen = 1; | |
373 | msghdr6.msg_control = cmsgbuf6; | |
374 | msghdr6.msg_controllen = sizeof(cmsgbuf6); | |
375 | ||
e9e2c950 RZ |
376 | mlen = recvmsg(sd, &msghdr6, MSG_DONTWAIT); |
377 | if (mlen == -1) { | |
03e7f088 | 378 | if (errno != EAGAIN) |
6e01e275 | 379 | log_error("ipv6-recv: recv failed: %s", |
03e7f088 RZ |
380 | strerror(errno)); |
381 | ||
e9e2c950 RZ |
382 | return -1; |
383 | } | |
384 | ||
385 | /* Get source address */ | |
386 | peer->sa_sin6 = *((struct sockaddr_in6 *)(msghdr6.msg_name)); | |
387 | ||
388 | /* Get and check TTL */ | |
389 | for (cm = CMSG_FIRSTHDR(&msghdr6); cm != NULL; | |
390 | cm = CMSG_NXTHDR(&msghdr6, cm)) { | |
391 | if (cm->cmsg_level != IPPROTO_IPV6) | |
392 | continue; | |
393 | ||
394 | if (cm->cmsg_type == IPV6_HOPLIMIT) { | |
6e01e275 | 395 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); |
50571b2e RZ |
396 | if (ttlval > 255) { |
397 | log_debug("ipv6-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
398 | return -1; |
399 | } | |
50571b2e RZ |
400 | |
401 | *ttl = ttlval; | |
e9e2c950 RZ |
402 | } else if (cm->cmsg_type == IPV6_PKTINFO) { |
403 | pi6 = (struct in6_pktinfo *)CMSG_DATA(cm); | |
404 | if (pi6) { | |
405 | local->sa_sin.sin_family = AF_INET6; | |
406 | local->sa_sin6.sin6_addr = pi6->ipi6_addr; | |
407 | fetch_portname_from_ifindex(pi6->ipi6_ifindex, | |
408 | port, portlen); | |
43adc702 | 409 | ifindex = pi6->ipi6_ifindex; |
e9e2c950 RZ |
410 | } |
411 | } | |
412 | } | |
413 | ||
43adc702 RZ |
414 | /* Set scope ID for link local addresses. */ |
415 | if (IN6_IS_ADDR_LINKLOCAL(&peer->sa_sin6.sin6_addr)) | |
416 | peer->sa_sin6.sin6_scope_id = ifindex; | |
417 | if (IN6_IS_ADDR_LINKLOCAL(&local->sa_sin6.sin6_addr)) | |
418 | local->sa_sin6.sin6_scope_id = ifindex; | |
419 | ||
e9e2c950 RZ |
420 | return mlen; |
421 | } | |
422 | ||
423 | static void bfd_sd_reschedule(int sd) | |
424 | { | |
425 | if (sd == bglobal.bg_shop) { | |
8529e180 | 426 | THREAD_OFF(bglobal.bg_ev[0]); |
e9e2c950 RZ |
427 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop, |
428 | &bglobal.bg_ev[0]); | |
429 | } else if (sd == bglobal.bg_mhop) { | |
8529e180 | 430 | THREAD_OFF(bglobal.bg_ev[1]); |
e9e2c950 RZ |
431 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop, |
432 | &bglobal.bg_ev[1]); | |
433 | } else if (sd == bglobal.bg_shop6) { | |
8529e180 | 434 | THREAD_OFF(bglobal.bg_ev[2]); |
e9e2c950 RZ |
435 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop6, |
436 | &bglobal.bg_ev[2]); | |
437 | } else if (sd == bglobal.bg_mhop6) { | |
8529e180 | 438 | THREAD_OFF(bglobal.bg_ev[3]); |
e9e2c950 RZ |
439 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop6, |
440 | &bglobal.bg_ev[3]); | |
441 | } else if (sd == bglobal.bg_echo) { | |
8529e180 | 442 | THREAD_OFF(bglobal.bg_ev[4]); |
e9e2c950 RZ |
443 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echo, |
444 | &bglobal.bg_ev[4]); | |
2f11c53f | 445 | } else if (sd == bglobal.bg_echov6) { |
8529e180 | 446 | THREAD_OFF(bglobal.bg_ev[5]); |
2f11c53f RZ |
447 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echov6, |
448 | &bglobal.bg_ev[5]); | |
e9e2c950 RZ |
449 | } |
450 | } | |
451 | ||
03e7f088 RZ |
452 | static void cp_debug(bool mhop, struct sockaddr_any *peer, |
453 | struct sockaddr_any *local, const char *port, | |
454 | const char *vrf, const char *fmt, ...) | |
455 | { | |
456 | char buf[512], peerstr[128], localstr[128], portstr[64], vrfstr[64]; | |
457 | va_list vl; | |
458 | ||
459 | if (peer->sa_sin.sin_family) | |
460 | snprintf(peerstr, sizeof(peerstr), " peer:%s", satostr(peer)); | |
461 | else | |
462 | peerstr[0] = 0; | |
463 | ||
464 | if (local->sa_sin.sin_family) | |
465 | snprintf(localstr, sizeof(localstr), " local:%s", | |
466 | satostr(local)); | |
467 | else | |
468 | localstr[0] = 0; | |
469 | ||
470 | if (port[0]) | |
471 | snprintf(portstr, sizeof(portstr), " port:%s", port); | |
472 | else | |
473 | portstr[0] = 0; | |
474 | ||
475 | if (vrf[0]) | |
476 | snprintf(vrfstr, sizeof(vrfstr), " vrf:%s", port); | |
477 | else | |
478 | vrfstr[0] = 0; | |
479 | ||
480 | va_start(vl, fmt); | |
481 | vsnprintf(buf, sizeof(buf), fmt, vl); | |
482 | va_end(vl); | |
483 | ||
484 | log_debug("control-packet: %s [mhop:%s%s%s%s%s]", buf, | |
485 | mhop ? "yes" : "no", peerstr, localstr, portstr, vrfstr); | |
486 | } | |
487 | ||
e9e2c950 RZ |
488 | int bfd_recv_cb(struct thread *t) |
489 | { | |
490 | int sd = THREAD_FD(t); | |
491 | struct bfd_session *bfd; | |
492 | struct bfd_pkt *cp; | |
8a9f760e | 493 | bool is_mhop; |
e9e2c950 | 494 | ssize_t mlen = 0; |
e9e2c950 | 495 | uint32_t oldEchoXmt_TO, oldXmtTime; |
50571b2e | 496 | uint8_t ttl; |
e9e2c950 RZ |
497 | struct sockaddr_any local, peer; |
498 | char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1]; | |
50571b2e | 499 | uint8_t msgbuf[1516]; |
e9e2c950 RZ |
500 | |
501 | /* Schedule next read. */ | |
502 | bfd_sd_reschedule(sd); | |
503 | ||
03e7f088 | 504 | /* Handle echo packets. */ |
2f11c53f | 505 | if (sd == bglobal.bg_echo || sd == bglobal.bg_echov6) { |
e9e2c950 RZ |
506 | ptm_bfd_process_echo_pkt(sd); |
507 | return 0; | |
508 | } | |
509 | ||
ff98a589 RZ |
510 | /* Sanitize input/output. */ |
511 | memset(port, 0, sizeof(port)); | |
512 | memset(vrfname, 0, sizeof(vrfname)); | |
513 | memset(&local, 0, sizeof(local)); | |
514 | memset(&peer, 0, sizeof(peer)); | |
515 | ||
03e7f088 | 516 | /* Handle control packets. */ |
8a9f760e | 517 | is_mhop = false; |
e9e2c950 RZ |
518 | if (sd == bglobal.bg_shop || sd == bglobal.bg_mhop) { |
519 | is_mhop = sd == bglobal.bg_mhop; | |
50571b2e RZ |
520 | mlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), &ttl, port, |
521 | sizeof(port), vrfname, sizeof(vrfname), | |
522 | &local, &peer); | |
e9e2c950 RZ |
523 | } else if (sd == bglobal.bg_shop6 || sd == bglobal.bg_mhop6) { |
524 | is_mhop = sd == bglobal.bg_mhop6; | |
50571b2e RZ |
525 | mlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), &ttl, port, |
526 | sizeof(port), vrfname, sizeof(vrfname), | |
527 | &local, &peer); | |
e9e2c950 | 528 | } |
e9e2c950 RZ |
529 | |
530 | /* Implement RFC 5880 6.8.6 */ | |
531 | if (mlen < BFD_PKT_LEN) { | |
03e7f088 RZ |
532 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
533 | "too small (%ld bytes)", mlen); | |
e9e2c950 RZ |
534 | return 0; |
535 | } | |
536 | ||
50571b2e RZ |
537 | /* Validate packet TTL. */ |
538 | if ((is_mhop == false) && (ttl != BFD_TTL_VAL)) { | |
539 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
540 | "invalid TTL: %d expected %d", ttl, BFD_TTL_VAL); | |
541 | return 0; | |
542 | } | |
543 | ||
03e7f088 RZ |
544 | /* |
545 | * Parse the control header for inconsistencies: | |
546 | * - Invalid version; | |
547 | * - Bad multiplier configuration; | |
548 | * - Short packets; | |
549 | * - Invalid discriminator; | |
550 | */ | |
16084964 | 551 | cp = (struct bfd_pkt *)(msgbuf); |
e9e2c950 | 552 | if (BFD_GETVER(cp->diag) != BFD_VERSION) { |
03e7f088 RZ |
553 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
554 | "bad version %d", BFD_GETVER(cp->diag)); | |
e9e2c950 RZ |
555 | return 0; |
556 | } | |
557 | ||
558 | if (cp->detect_mult == 0) { | |
03e7f088 RZ |
559 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
560 | "detect multiplier set to zero"); | |
e9e2c950 RZ |
561 | return 0; |
562 | } | |
563 | ||
564 | if ((cp->len < BFD_PKT_LEN) || (cp->len > mlen)) { | |
03e7f088 | 565 | cp_debug(is_mhop, &peer, &local, port, vrfname, "too small"); |
e9e2c950 RZ |
566 | return 0; |
567 | } | |
568 | ||
569 | if (cp->discrs.my_discr == 0) { | |
03e7f088 RZ |
570 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
571 | "'my discriminator' is zero"); | |
e9e2c950 RZ |
572 | return 0; |
573 | } | |
574 | ||
03e7f088 | 575 | /* Find the session that this packet belongs. */ |
e9e2c950 RZ |
576 | bfd = ptm_bfd_sess_find(cp, port, &peer, &local, vrfname, is_mhop); |
577 | if (bfd == NULL) { | |
03e7f088 RZ |
578 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
579 | "no session found"); | |
e9e2c950 RZ |
580 | return 0; |
581 | } | |
582 | ||
e9e2c950 | 583 | bfd->stats.rx_ctrl_pkt++; |
03e7f088 RZ |
584 | |
585 | /* | |
586 | * Multi hop: validate packet TTL. | |
587 | * Single hop: set local address that received the packet. | |
588 | */ | |
e9e2c950 | 589 | if (is_mhop) { |
6e01e275 | 590 | if ((BFD_TTL_VAL - bfd->mh_ttl) > BFD_TTL_VAL) { |
03e7f088 RZ |
591 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
592 | "exceeded max hop count (expected %d, got %d)", | |
6e01e275 | 593 | bfd->mh_ttl, BFD_TTL_VAL); |
e9e2c950 RZ |
594 | return 0; |
595 | } | |
596 | } else if (bfd->local_ip.sa_sin.sin_family == AF_UNSPEC) { | |
597 | bfd->local_ip = local; | |
598 | } | |
599 | ||
600 | /* | |
601 | * If no interface was detected, save the interface where the | |
602 | * packet came in. | |
603 | */ | |
604 | if (bfd->ifindex == 0) | |
605 | bfd->ifindex = ptm_bfd_fetch_ifindex(port); | |
606 | ||
03e7f088 | 607 | /* Log remote discriminator changes. */ |
e9e2c950 | 608 | if ((bfd->discrs.remote_discr != 0) |
03e7f088 RZ |
609 | && (bfd->discrs.remote_discr != ntohl(cp->discrs.my_discr))) |
610 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
611 | "remote discriminator mismatch (expected %d, got %d)", | |
612 | bfd->discrs.remote_discr, ntohl(cp->discrs.my_discr)); | |
e9e2c950 RZ |
613 | |
614 | bfd->discrs.remote_discr = ntohl(cp->discrs.my_discr); | |
615 | ||
616 | /* If received the Final bit, the new values should take effect */ | |
617 | if (bfd->polling && BFD_GETFBIT(cp->flags)) { | |
618 | bfd->timers.desired_min_tx = bfd->new_timers.desired_min_tx; | |
619 | bfd->timers.required_min_rx = bfd->new_timers.required_min_rx; | |
620 | bfd->new_timers.desired_min_tx = 0; | |
621 | bfd->new_timers.required_min_rx = 0; | |
622 | bfd->polling = 0; | |
623 | } | |
624 | ||
625 | if (!bfd->demand_mode) { | |
626 | /* Compute detect time */ | |
627 | bfd->detect_TO = cp->detect_mult | |
628 | * ((bfd->timers.required_min_rx | |
629 | > ntohl(cp->timers.desired_min_tx)) | |
630 | ? bfd->timers.required_min_rx | |
631 | : ntohl(cp->timers.desired_min_tx)); | |
632 | bfd->remote_detect_mult = cp->detect_mult; | |
03e7f088 RZ |
633 | } else |
634 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
635 | "unsupported demand mode"); | |
e9e2c950 RZ |
636 | |
637 | /* Save remote diagnostics before state switch. */ | |
638 | bfd->remote_diag = cp->diag & BFD_DIAGMASK; | |
639 | ||
640 | /* State switch from section 6.8.6 */ | |
e9e2c950 RZ |
641 | if (BFD_GETSTATE(cp->flags) == PTM_BFD_ADM_DOWN) { |
642 | if (bfd->ses_state != PTM_BFD_DOWN) | |
40675ea9 | 643 | ptm_bfd_ses_dn(bfd, BD_NEIGHBOR_DOWN); |
e9e2c950 RZ |
644 | } else { |
645 | switch (bfd->ses_state) { | |
646 | case (PTM_BFD_DOWN): | |
647 | if (BFD_GETSTATE(cp->flags) == PTM_BFD_INIT) | |
648 | ptm_bfd_ses_up(bfd); | |
649 | else if (BFD_GETSTATE(cp->flags) == PTM_BFD_DOWN) | |
650 | bfd->ses_state = PTM_BFD_INIT; | |
651 | break; | |
652 | case (PTM_BFD_INIT): | |
653 | if (BFD_GETSTATE(cp->flags) == PTM_BFD_INIT | |
654 | || BFD_GETSTATE(cp->flags) == PTM_BFD_UP) | |
655 | ptm_bfd_ses_up(bfd); | |
656 | break; | |
657 | case (PTM_BFD_UP): | |
658 | if (BFD_GETSTATE(cp->flags) == PTM_BFD_DOWN) | |
40675ea9 | 659 | ptm_bfd_ses_dn(bfd, BD_NEIGHBOR_DOWN); |
e9e2c950 RZ |
660 | break; |
661 | } | |
662 | } | |
663 | ||
03e7f088 RZ |
664 | /* |
665 | * Handle echo packet status: | |
666 | * - Start echo packets if configured and permitted | |
667 | * (required_min_echo > 0); | |
668 | * - Stop echo packets if not allowed (required_min_echo == 0); | |
669 | * - Recalculate echo packet interval; | |
670 | */ | |
e9e2c950 RZ |
671 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO)) { |
672 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) { | |
673 | if (!ntohl(cp->timers.required_min_echo)) { | |
674 | ptm_bfd_echo_stop(bfd, 1); | |
675 | } else { | |
676 | oldEchoXmt_TO = bfd->echo_xmt_TO; | |
677 | bfd->echo_xmt_TO = | |
678 | bfd->timers.required_min_echo; | |
679 | if (ntohl(cp->timers.required_min_echo) | |
680 | > bfd->echo_xmt_TO) | |
681 | bfd->echo_xmt_TO = ntohl( | |
682 | cp->timers.required_min_echo); | |
683 | if (oldEchoXmt_TO != bfd->echo_xmt_TO) | |
684 | ptm_bfd_echo_start(bfd); | |
685 | } | |
686 | } else if (ntohl(cp->timers.required_min_echo)) { | |
687 | bfd->echo_xmt_TO = bfd->timers.required_min_echo; | |
688 | if (ntohl(cp->timers.required_min_echo) | |
689 | > bfd->echo_xmt_TO) | |
690 | bfd->echo_xmt_TO = | |
691 | ntohl(cp->timers.required_min_echo); | |
692 | ptm_bfd_echo_start(bfd); | |
693 | } | |
694 | } | |
695 | ||
696 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) { | |
697 | bfd->echo_xmt_TO = bfd->timers.required_min_echo; | |
698 | if (ntohl(cp->timers.required_min_echo) > bfd->echo_xmt_TO) | |
699 | bfd->echo_xmt_TO = ntohl(cp->timers.required_min_echo); | |
700 | } | |
701 | ||
702 | /* Calculate new transmit time */ | |
703 | oldXmtTime = bfd->xmt_TO; | |
704 | bfd->xmt_TO = | |
705 | (bfd->timers.desired_min_tx > ntohl(cp->timers.required_min_rx)) | |
706 | ? bfd->timers.desired_min_tx | |
707 | : ntohl(cp->timers.required_min_rx); | |
708 | ||
709 | /* If transmit time has changed, and too much time until next xmt, | |
710 | * restart | |
711 | */ | |
712 | if (BFD_GETPBIT(cp->flags)) { | |
713 | ptm_bfd_xmt_TO(bfd, 1); | |
714 | } else if (oldXmtTime != bfd->xmt_TO) { | |
715 | /* XXX add some skid to this as well */ | |
716 | ptm_bfd_start_xmt_timer(bfd, false); | |
717 | } | |
718 | ||
03e7f088 RZ |
719 | /* Restart detection timer (packet received) */ |
720 | if (!bfd->demand_mode) | |
e9e2c950 | 721 | bfd_recvtimer_update(bfd); |
e9e2c950 RZ |
722 | |
723 | /* | |
724 | * Save the timers and state sent by the remote end | |
725 | * for debugging and statistics. | |
726 | */ | |
727 | if (BFD_GETFBIT(cp->flags)) { | |
728 | bfd->remote_timers.desired_min_tx = | |
729 | ntohl(cp->timers.desired_min_tx); | |
730 | bfd->remote_timers.required_min_rx = | |
731 | ntohl(cp->timers.required_min_rx); | |
732 | bfd->remote_timers.required_min_echo = | |
733 | ntohl(cp->timers.required_min_echo); | |
734 | ||
735 | control_notify_config(BCM_NOTIFY_CONFIG_UPDATE, bfd); | |
736 | } | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
2f11c53f RZ |
741 | /* |
742 | * bp_bfd_echo_in: proccesses an BFD echo packet. On TTL == BFD_TTL_VAL | |
743 | * the packet is looped back or returns the my discriminator ID along | |
744 | * with the TTL. | |
745 | * | |
746 | * Returns -1 on error or loopback or 0 on success. | |
747 | */ | |
748 | int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr) | |
749 | { | |
750 | struct bfd_echo_pkt *bep; | |
751 | ssize_t rlen; | |
752 | struct sockaddr_any local, peer; | |
753 | char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1]; | |
754 | uint8_t msgbuf[1516]; | |
755 | ||
756 | if (sd == bglobal.bg_echo) | |
757 | rlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), ttl, port, | |
758 | sizeof(port), vrfname, sizeof(vrfname), | |
759 | &local, &peer); | |
760 | else | |
761 | rlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), ttl, port, | |
762 | sizeof(port), vrfname, sizeof(vrfname), | |
763 | &local, &peer); | |
764 | ||
765 | /* Short packet, better not risk reading it. */ | |
766 | if (rlen < (ssize_t)sizeof(*bep)) { | |
767 | cp_debug(false, &peer, &local, port, vrfname, | |
768 | "small echo packet"); | |
769 | return -1; | |
770 | } | |
771 | ||
772 | /* Test for loopback. */ | |
773 | if (*ttl == BFD_TTL_VAL) { | |
774 | bp_udp_send(sd, *ttl - 1, msgbuf, rlen, | |
775 | (struct sockaddr *)&peer, | |
776 | (sd == bglobal.bg_echo) ? sizeof(peer.sa_sin) | |
777 | : sizeof(peer.sa_sin6)); | |
778 | return -1; | |
779 | } | |
780 | ||
781 | /* Read my discriminator from BFD Echo packet. */ | |
782 | bep = (struct bfd_echo_pkt *)msgbuf; | |
783 | *my_discr = ntohl(bep->my_discr); | |
784 | if (*my_discr == 0) { | |
785 | cp_debug(false, &peer, &local, port, vrfname, | |
786 | "invalid echo packet discriminator (zero)"); | |
787 | return -1; | |
788 | } | |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
793 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, | |
794 | struct sockaddr *to, socklen_t tolen) | |
795 | { | |
796 | struct cmsghdr *cmsg; | |
797 | ssize_t wlen; | |
798 | int ttlval = ttl; | |
799 | bool is_ipv6 = to->sa_family == AF_INET6; | |
800 | struct msghdr msg; | |
801 | struct iovec iov[1]; | |
802 | uint8_t msgctl[255]; | |
803 | ||
804 | /* Prepare message data. */ | |
805 | iov[0].iov_base = data; | |
806 | iov[0].iov_len = datalen; | |
807 | ||
808 | memset(&msg, 0, sizeof(msg)); | |
809 | memset(msgctl, 0, sizeof(msgctl)); | |
810 | msg.msg_name = to; | |
811 | msg.msg_namelen = tolen; | |
812 | msg.msg_iov = iov; | |
813 | msg.msg_iovlen = 1; | |
814 | ||
815 | /* Prepare the packet TTL information. */ | |
816 | if (ttl > 0) { | |
817 | /* Use ancillary data. */ | |
818 | msg.msg_control = msgctl; | |
819 | msg.msg_controllen = CMSG_LEN(sizeof(ttlval)); | |
820 | ||
821 | /* Configure the ancillary data. */ | |
822 | cmsg = CMSG_FIRSTHDR(&msg); | |
823 | cmsg->cmsg_len = CMSG_LEN(sizeof(ttlval)); | |
824 | if (is_ipv6) { | |
825 | cmsg->cmsg_level = IPPROTO_IPV6; | |
826 | cmsg->cmsg_type = IPV6_HOPLIMIT; | |
827 | } else { | |
828 | #if BFD_LINUX | |
829 | cmsg->cmsg_level = IPPROTO_IP; | |
830 | cmsg->cmsg_type = IP_TTL; | |
831 | #else | |
832 | /* FreeBSD does not support TTL in ancillary data. */ | |
833 | msg.msg_control = NULL; | |
834 | msg.msg_controllen = 0; | |
835 | ||
836 | bp_set_ttl(sd, ttl); | |
837 | #endif /* BFD_BSD */ | |
838 | } | |
839 | memcpy(CMSG_DATA(cmsg), &ttlval, sizeof(ttlval)); | |
840 | } | |
841 | ||
842 | /* Send echo back. */ | |
843 | wlen = sendmsg(sd, &msg, 0); | |
844 | if (wlen <= 0) { | |
845 | log_debug("udp-send: loopback failure: (%d) %s", errno, strerror(errno)); | |
846 | return -1; | |
847 | } else if (wlen < (ssize_t)datalen) { | |
848 | log_debug("udp-send: partial send: %ld expected %ld", wlen, | |
849 | datalen); | |
850 | return -1; | |
851 | } | |
852 | ||
853 | return 0; | |
854 | } | |
855 | ||
e9e2c950 RZ |
856 | |
857 | /* | |
858 | * Sockets creation. | |
859 | */ | |
860 | ||
861 | ||
862 | /* | |
863 | * IPv4 sockets | |
864 | */ | |
6e01e275 | 865 | int bp_set_ttl(int sd, uint8_t value) |
e9e2c950 | 866 | { |
6e01e275 RZ |
867 | int ttl = value; |
868 | ||
869 | if (setsockopt(sd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) { | |
870 | log_warning("set-ttl: setsockopt(IP_TTL, %d): %s", value, | |
e9e2c950 RZ |
871 | strerror(errno)); |
872 | return -1; | |
873 | } | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
6e01e275 | 878 | int bp_set_tos(int sd, uint8_t value) |
e9e2c950 | 879 | { |
6e01e275 RZ |
880 | int tos = value; |
881 | ||
882 | if (setsockopt(sd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) { | |
883 | log_warning("set-tos: setsockopt(IP_TOS, %d): %s", value, | |
e9e2c950 RZ |
884 | strerror(errno)); |
885 | return -1; | |
886 | } | |
887 | ||
888 | return 0; | |
889 | } | |
890 | ||
891 | static void bp_set_ipopts(int sd) | |
892 | { | |
6e01e275 RZ |
893 | int rcvttl = BFD_RCV_TTL_VAL; |
894 | ||
895 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) | |
896 | log_fatal("set-ipopts: TTL configuration failed"); | |
e9e2c950 RZ |
897 | |
898 | if (setsockopt(sd, IPPROTO_IP, IP_RECVTTL, &rcvttl, sizeof(rcvttl)) | |
899 | == -1) | |
6e01e275 | 900 | log_fatal("set-ipopts: setsockopt(IP_RECVTTL, %d): %s", rcvttl, |
e9e2c950 RZ |
901 | strerror(errno)); |
902 | ||
903 | #ifdef BFD_LINUX | |
904 | int pktinfo = BFD_PKT_INFO_VAL; | |
6e01e275 | 905 | |
e9e2c950 RZ |
906 | /* Figure out address and interface to do the peer matching. */ |
907 | if (setsockopt(sd, IPPROTO_IP, IP_PKTINFO, &pktinfo, sizeof(pktinfo)) | |
908 | == -1) | |
6e01e275 | 909 | log_fatal("set-ipopts: setsockopt(IP_PKTINFO, %d): %s", pktinfo, |
e9e2c950 RZ |
910 | strerror(errno)); |
911 | #endif /* BFD_LINUX */ | |
912 | #ifdef BFD_BSD | |
913 | int yes = 1; | |
914 | ||
915 | /* Find out our address for peer matching. */ | |
916 | if (setsockopt(sd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) == -1) | |
6e01e275 | 917 | log_fatal("set-ipopts: setsockopt(IP_RECVDSTADDR, %d): %s", yes, |
e9e2c950 RZ |
918 | strerror(errno)); |
919 | ||
920 | /* Find out interface where the packet came in. */ | |
921 | if (setsockopt_ifindex(AF_INET, sd, yes) == -1) | |
6e01e275 | 922 | log_fatal("set-ipopts: setsockopt_ipv4_ifindex(%d): %s", yes, |
e9e2c950 RZ |
923 | strerror(errno)); |
924 | #endif /* BFD_BSD */ | |
925 | } | |
926 | ||
927 | static void bp_bind_ip(int sd, uint16_t port) | |
928 | { | |
929 | struct sockaddr_in sin; | |
930 | ||
931 | memset(&sin, 0, sizeof(sin)); | |
932 | sin.sin_family = AF_INET; | |
933 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
934 | sin.sin_port = htons(port); | |
935 | if (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1) | |
6e01e275 | 936 | log_fatal("bind-ip: bind: %s", strerror(errno)); |
e9e2c950 RZ |
937 | } |
938 | ||
939 | int bp_udp_shop(void) | |
940 | { | |
941 | int sd; | |
942 | ||
943 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
944 | if (sd == -1) | |
6e01e275 | 945 | log_fatal("udp-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
946 | |
947 | bp_set_ipopts(sd); | |
948 | bp_bind_ip(sd, BFD_DEFDESTPORT); | |
949 | ||
950 | return sd; | |
951 | } | |
952 | ||
953 | int bp_udp_mhop(void) | |
954 | { | |
955 | int sd; | |
956 | ||
957 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
958 | if (sd == -1) | |
6e01e275 | 959 | log_fatal("udp-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
960 | |
961 | bp_set_ipopts(sd); | |
962 | bp_bind_ip(sd, BFD_DEF_MHOP_DEST_PORT); | |
963 | ||
964 | return sd; | |
965 | } | |
966 | ||
967 | int bp_peer_socket(struct bfd_peer_cfg *bpc) | |
968 | { | |
969 | int sd, pcount; | |
970 | struct sockaddr_in sin; | |
971 | static int srcPort = BFD_SRCPORTINIT; | |
972 | ||
973 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
974 | if (sd == -1) { |
975 | log_error("ipv4-new: failed to create socket: %s", | |
976 | strerror(errno)); | |
e9e2c950 | 977 | return -1; |
03e7f088 | 978 | } |
e9e2c950 | 979 | |
8a9f760e RZ |
980 | /* Set TTL to 255 for all transmitted packets */ |
981 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) { | |
982 | close(sd); | |
983 | return -1; | |
e9e2c950 RZ |
984 | } |
985 | ||
986 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 987 | if (bp_set_tos(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
988 | close(sd); |
989 | return -1; | |
990 | } | |
991 | ||
8a9f760e | 992 | if (bpc->bpc_has_localif) { |
e9e2c950 RZ |
993 | if (bp_bind_dev(sd, bpc->bpc_localif) != 0) { |
994 | close(sd); | |
995 | return -1; | |
996 | } | |
997 | } else if (bpc->bpc_mhop && bpc->bpc_has_vrfname) { | |
998 | if (bp_bind_dev(sd, bpc->bpc_vrfname) != 0) { | |
999 | close(sd); | |
1000 | return -1; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | /* Find an available source port in the proper range */ | |
1005 | memset(&sin, 0, sizeof(sin)); | |
1006 | sin = bpc->bpc_local.sa_sin; | |
1007 | sin.sin_family = AF_INET; | |
1008 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1009 | sin.sin_len = sizeof(sin); | |
1010 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
8a9f760e | 1011 | if (bpc->bpc_mhop) |
e9e2c950 RZ |
1012 | sin.sin_addr = bpc->bpc_local.sa_sin.sin_addr; |
1013 | else | |
1014 | sin.sin_addr.s_addr = INADDR_ANY; | |
1015 | ||
1016 | pcount = 0; | |
1017 | do { | |
1018 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
1019 | /* Searched all ports, none available */ | |
03e7f088 RZ |
1020 | log_error("ipv4-new: failed to bind port: %s", |
1021 | strerror(errno)); | |
e9e2c950 RZ |
1022 | close(sd); |
1023 | return -1; | |
1024 | } | |
1025 | if (srcPort >= BFD_SRCPORTMAX) | |
1026 | srcPort = BFD_SRCPORTINIT; | |
1027 | sin.sin_port = htons(srcPort++); | |
1028 | } while (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) < 0); | |
1029 | ||
1030 | return sd; | |
1031 | } | |
1032 | ||
1033 | ||
1034 | /* | |
1035 | * IPv6 sockets | |
1036 | */ | |
1037 | ||
1038 | int bp_peer_socketv6(struct bfd_peer_cfg *bpc) | |
1039 | { | |
1040 | int sd, pcount, ifindex; | |
1041 | struct sockaddr_in6 sin6; | |
1042 | static int srcPort = BFD_SRCPORTINIT; | |
1043 | ||
1044 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
1045 | if (sd == -1) { |
1046 | log_error("ipv6-new: failed to create socket: %s", | |
1047 | strerror(errno)); | |
e9e2c950 | 1048 | return -1; |
03e7f088 | 1049 | } |
e9e2c950 | 1050 | |
8a9f760e RZ |
1051 | /* Set TTL to 255 for all transmitted packets */ |
1052 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) != 0) { | |
1053 | close(sd); | |
1054 | return -1; | |
e9e2c950 RZ |
1055 | } |
1056 | ||
1057 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 1058 | if (bp_set_tosv6(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
1059 | close(sd); |
1060 | return -1; | |
1061 | } | |
1062 | ||
1063 | /* Find an available source port in the proper range */ | |
1064 | memset(&sin6, 0, sizeof(sin6)); | |
1065 | sin6.sin6_family = AF_INET6; | |
1066 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1067 | sin6.sin6_len = sizeof(sin6); | |
1068 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1069 | sin6 = bpc->bpc_local.sa_sin6; | |
43adc702 RZ |
1070 | ifindex = ptm_bfd_fetch_ifindex(bpc->bpc_localif); |
1071 | if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) | |
e9e2c950 | 1072 | sin6.sin6_scope_id = ifindex; |
e9e2c950 RZ |
1073 | |
1074 | if (bpc->bpc_has_localif) { | |
1075 | if (bp_bind_dev(sd, bpc->bpc_localif) != 0) { | |
1076 | close(sd); | |
1077 | return -1; | |
1078 | } | |
1079 | } else if (bpc->bpc_mhop && bpc->bpc_has_vrfname) { | |
1080 | if (bp_bind_dev(sd, bpc->bpc_vrfname) != 0) { | |
1081 | close(sd); | |
1082 | return -1; | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | pcount = 0; | |
1087 | do { | |
1088 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
1089 | /* Searched all ports, none available */ | |
03e7f088 RZ |
1090 | log_error("ipv6-new: failed to bind port: %s", |
1091 | strerror(errno)); | |
e9e2c950 RZ |
1092 | close(sd); |
1093 | return -1; | |
1094 | } | |
1095 | if (srcPort >= BFD_SRCPORTMAX) | |
1096 | srcPort = BFD_SRCPORTINIT; | |
1097 | sin6.sin6_port = htons(srcPort++); | |
1098 | } while (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) < 0); | |
1099 | ||
1100 | return sd; | |
1101 | } | |
1102 | ||
6e01e275 | 1103 | int bp_set_ttlv6(int sd, uint8_t value) |
e9e2c950 | 1104 | { |
6e01e275 RZ |
1105 | int ttl = value; |
1106 | ||
1107 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) | |
e9e2c950 | 1108 | == -1) { |
6e01e275 RZ |
1109 | log_warning("set-ttlv6: setsockopt(IPV6_UNICAST_HOPS, %d): %s", |
1110 | value, strerror(errno)); | |
e9e2c950 RZ |
1111 | return -1; |
1112 | } | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
6e01e275 | 1117 | int bp_set_tosv6(int sd, uint8_t value) |
e9e2c950 | 1118 | { |
6e01e275 RZ |
1119 | int tos = value; |
1120 | ||
1121 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) | |
e9e2c950 | 1122 | == -1) { |
6e01e275 | 1123 | log_warning("set-tosv6: setsockopt(IPV6_TCLASS, %d): %s", value, |
e9e2c950 RZ |
1124 | strerror(errno)); |
1125 | return -1; | |
1126 | } | |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | static void bp_set_ipv6opts(int sd) | |
1132 | { | |
6e01e275 RZ |
1133 | int ipv6_pktinfo = BFD_IPV6_PKT_INFO_VAL; |
1134 | int ipv6_only = BFD_IPV6_ONLY_VAL; | |
e9e2c950 | 1135 | |
6e01e275 RZ |
1136 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) == -1) |
1137 | log_fatal("set-ipv6opts: setsockopt(IPV6_UNICAST_HOPS, %d): %s", | |
1138 | BFD_TTL_VAL, strerror(errno)); | |
e9e2c950 | 1139 | |
6e01e275 RZ |
1140 | if (setsockopt_ipv6_hoplimit(sd, BFD_RCV_TTL_VAL) == -1) |
1141 | log_fatal("set-ipv6opts: setsockopt(IPV6_HOPLIMIT, %d): %s", | |
1142 | BFD_RCV_TTL_VAL, strerror(errno)); | |
e9e2c950 RZ |
1143 | |
1144 | if (setsockopt_ipv6_pktinfo(sd, ipv6_pktinfo) == -1) | |
6e01e275 RZ |
1145 | log_fatal("set-ipv6opts: setsockopt(IPV6_PKTINFO, %d): %s", |
1146 | ipv6_pktinfo, strerror(errno)); | |
e9e2c950 RZ |
1147 | |
1148 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6_only, | |
1149 | sizeof(ipv6_only)) | |
1150 | == -1) | |
6e01e275 RZ |
1151 | log_fatal("set-ipv6opts: setsockopt(IPV6_V6ONLY, %d): %s", |
1152 | ipv6_only, strerror(errno)); | |
e9e2c950 RZ |
1153 | } |
1154 | ||
1155 | static void bp_bind_ipv6(int sd, uint16_t port) | |
1156 | { | |
1157 | struct sockaddr_in6 sin6; | |
1158 | ||
1159 | memset(&sin6, 0, sizeof(sin6)); | |
1160 | sin6.sin6_family = AF_INET6; | |
1161 | sin6.sin6_addr = in6addr_any; | |
1162 | sin6.sin6_port = htons(port); | |
1163 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1164 | sin6.sin6_len = sizeof(sin6); | |
1165 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1166 | if (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) == -1) | |
6e01e275 | 1167 | log_fatal("bind-ipv6: bind: %s", strerror(errno)); |
e9e2c950 RZ |
1168 | } |
1169 | ||
1170 | int bp_udp6_shop(void) | |
1171 | { | |
1172 | int sd; | |
1173 | ||
1174 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1175 | if (sd == -1) | |
6e01e275 | 1176 | log_fatal("udp6-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1177 | |
1178 | bp_set_ipv6opts(sd); | |
1179 | bp_bind_ipv6(sd, BFD_DEFDESTPORT); | |
1180 | ||
1181 | return sd; | |
1182 | } | |
1183 | ||
1184 | int bp_udp6_mhop(void) | |
1185 | { | |
1186 | int sd; | |
1187 | ||
1188 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1189 | if (sd == -1) | |
6e01e275 | 1190 | log_fatal("udp6-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1191 | |
1192 | bp_set_ipv6opts(sd); | |
1193 | bp_bind_ipv6(sd, BFD_DEF_MHOP_DEST_PORT); | |
1194 | ||
1195 | return sd; | |
1196 | } | |
2f11c53f RZ |
1197 | |
1198 | int bp_echo_socket(void) | |
1199 | { | |
1200 | int s; | |
1201 | ||
1202 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
1203 | if (s == -1) | |
1204 | log_fatal("echo-socket: socket: %s", strerror(errno)); | |
1205 | ||
1206 | bp_set_ipopts(s); | |
1207 | bp_bind_ip(s, BFD_DEF_ECHO_PORT); | |
1208 | ||
1209 | return s; | |
1210 | } | |
1211 | ||
1212 | int bp_echov6_socket(void) | |
1213 | { | |
1214 | int s; | |
1215 | ||
1216 | s = socket(AF_INET6, SOCK_DGRAM, 0); | |
1217 | if (s == -1) | |
1218 | log_fatal("echov6-socket: socket: %s", strerror(errno)); | |
1219 | ||
1220 | bp_set_ipv6opts(s); | |
1221 | bp_bind_ipv6(s, BFD_DEF_ECHO_PORT); | |
1222 | ||
1223 | return s; | |
1224 | } |