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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 | 243 | { |
80edb675 | 244 | struct interface *ifp; |
e9e2c950 RZ |
245 | struct cmsghdr *cm; |
246 | int ifindex; | |
247 | ssize_t mlen; | |
16084964 RZ |
248 | struct sockaddr_in msgaddr; |
249 | struct msghdr msghdr; | |
250 | struct iovec iov[1]; | |
251 | uint8_t cmsgbuf[255]; | |
252 | ||
e10cfdaf DL |
253 | port[0] = '\0'; |
254 | ||
16084964 RZ |
255 | /* Prepare the recvmsg params. */ |
256 | iov[0].iov_base = msgbuf; | |
50571b2e | 257 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
258 | |
259 | memset(&msghdr, 0, sizeof(msghdr)); | |
260 | msghdr.msg_name = &msgaddr; | |
261 | msghdr.msg_namelen = sizeof(msgaddr); | |
262 | msghdr.msg_iov = iov; | |
263 | msghdr.msg_iovlen = 1; | |
264 | msghdr.msg_control = cmsgbuf; | |
265 | msghdr.msg_controllen = sizeof(cmsgbuf); | |
266 | ||
e9e2c950 RZ |
267 | mlen = recvmsg(sd, &msghdr, MSG_DONTWAIT); |
268 | if (mlen == -1) { | |
03e7f088 RZ |
269 | if (errno != EAGAIN) |
270 | log_error("ipv4-recv: recv failed: %s", | |
271 | strerror(errno)); | |
272 | ||
e9e2c950 RZ |
273 | return -1; |
274 | } | |
275 | ||
276 | /* Get source address */ | |
277 | peer->sa_sin = *((struct sockaddr_in *)(msghdr.msg_name)); | |
278 | ||
279 | /* Get and check TTL */ | |
280 | for (cm = CMSG_FIRSTHDR(&msghdr); cm != NULL; | |
281 | cm = CMSG_NXTHDR(&msghdr, cm)) { | |
282 | if (cm->cmsg_level != IPPROTO_IP) | |
283 | continue; | |
284 | ||
285 | switch (cm->cmsg_type) { | |
286 | #ifdef BFD_LINUX | |
287 | case IP_TTL: { | |
50571b2e RZ |
288 | uint32_t ttlval; |
289 | ||
290 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); | |
291 | if (ttlval > 255) { | |
292 | log_debug("ipv4-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
293 | return -1; |
294 | } | |
50571b2e | 295 | *ttl = ttlval; |
e9e2c950 RZ |
296 | break; |
297 | } | |
298 | ||
299 | case IP_PKTINFO: { | |
300 | struct in_pktinfo *pi = | |
301 | (struct in_pktinfo *)CMSG_DATA(cm); | |
302 | ||
303 | if (pi == NULL) | |
304 | break; | |
305 | ||
306 | local->sa_sin.sin_family = AF_INET; | |
307 | local->sa_sin.sin_addr = pi->ipi_addr; | |
f43a14d2 RZ |
308 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
309 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
310 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
80edb675 RZ |
311 | |
312 | ifp = if_lookup_by_index(pi->ipi_ifindex, VRF_DEFAULT); | |
313 | if (ifp == NULL) | |
314 | break; | |
315 | ||
316 | if (strlcpy(port, ifp->name, portlen) >= portlen) | |
317 | log_debug( | |
318 | "ipv4-recv: interface name truncated"); | |
e9e2c950 RZ |
319 | break; |
320 | } | |
321 | #endif /* BFD_LINUX */ | |
322 | #ifdef BFD_BSD | |
323 | case IP_RECVTTL: { | |
50571b2e | 324 | memcpy(ttl, CMSG_DATA(cm), sizeof(*ttl)); |
e9e2c950 RZ |
325 | break; |
326 | } | |
327 | ||
328 | case IP_RECVDSTADDR: { | |
329 | struct in_addr ia; | |
330 | ||
331 | memcpy(&ia, CMSG_DATA(cm), sizeof(ia)); | |
332 | local->sa_sin.sin_family = AF_INET; | |
333 | local->sa_sin.sin_addr = ia; | |
f43a14d2 RZ |
334 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
335 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
336 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 RZ |
337 | break; |
338 | } | |
339 | #endif /* BFD_BSD */ | |
340 | ||
341 | default: | |
342 | /* | |
343 | * On *BSDs we expect to land here when skipping | |
344 | * the IP_RECVIF header. It will be handled by | |
345 | * getsockopt_ifindex() below. | |
346 | */ | |
347 | /* NOTHING */ | |
348 | break; | |
349 | } | |
350 | } | |
351 | ||
352 | /* OS agnostic way of getting interface name. */ | |
353 | if (port[0] == 0) { | |
354 | ifindex = getsockopt_ifindex(AF_INET, &msghdr); | |
80edb675 RZ |
355 | if (ifindex <= 0) |
356 | return mlen; | |
357 | ||
358 | ifp = if_lookup_by_index(ifindex, VRF_DEFAULT); | |
359 | if (ifp == NULL) | |
360 | return mlen; | |
361 | ||
362 | if (strlcpy(port, ifp->name, portlen) >= portlen) | |
363 | log_debug("ipv4-recv: interface name truncated"); | |
e9e2c950 RZ |
364 | } |
365 | ||
366 | return mlen; | |
367 | } | |
368 | ||
50571b2e RZ |
369 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
370 | char *port, size_t portlen, char *vrfname, | |
371 | size_t vrfnamelen, struct sockaddr_any *local, | |
372 | struct sockaddr_any *peer) | |
e9e2c950 | 373 | { |
80edb675 | 374 | struct interface *ifp; |
e9e2c950 RZ |
375 | struct cmsghdr *cm; |
376 | struct in6_pktinfo *pi6 = NULL; | |
43adc702 | 377 | int ifindex = 0; |
e9e2c950 | 378 | ssize_t mlen; |
6e01e275 | 379 | uint32_t ttlval; |
16084964 RZ |
380 | struct sockaddr_in6 msgaddr6; |
381 | struct msghdr msghdr6; | |
382 | struct iovec iov[1]; | |
383 | uint8_t cmsgbuf6[255]; | |
384 | ||
385 | /* Prepare the recvmsg params. */ | |
386 | iov[0].iov_base = msgbuf; | |
50571b2e | 387 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
388 | |
389 | memset(&msghdr6, 0, sizeof(msghdr6)); | |
390 | msghdr6.msg_name = &msgaddr6; | |
391 | msghdr6.msg_namelen = sizeof(msgaddr6); | |
392 | msghdr6.msg_iov = iov; | |
393 | msghdr6.msg_iovlen = 1; | |
394 | msghdr6.msg_control = cmsgbuf6; | |
395 | msghdr6.msg_controllen = sizeof(cmsgbuf6); | |
396 | ||
e9e2c950 RZ |
397 | mlen = recvmsg(sd, &msghdr6, MSG_DONTWAIT); |
398 | if (mlen == -1) { | |
03e7f088 | 399 | if (errno != EAGAIN) |
6e01e275 | 400 | log_error("ipv6-recv: recv failed: %s", |
03e7f088 RZ |
401 | strerror(errno)); |
402 | ||
e9e2c950 RZ |
403 | return -1; |
404 | } | |
405 | ||
406 | /* Get source address */ | |
407 | peer->sa_sin6 = *((struct sockaddr_in6 *)(msghdr6.msg_name)); | |
408 | ||
409 | /* Get and check TTL */ | |
410 | for (cm = CMSG_FIRSTHDR(&msghdr6); cm != NULL; | |
411 | cm = CMSG_NXTHDR(&msghdr6, cm)) { | |
412 | if (cm->cmsg_level != IPPROTO_IPV6) | |
413 | continue; | |
414 | ||
415 | if (cm->cmsg_type == IPV6_HOPLIMIT) { | |
6e01e275 | 416 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); |
50571b2e RZ |
417 | if (ttlval > 255) { |
418 | log_debug("ipv6-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
419 | return -1; |
420 | } | |
50571b2e RZ |
421 | |
422 | *ttl = ttlval; | |
e9e2c950 RZ |
423 | } else if (cm->cmsg_type == IPV6_PKTINFO) { |
424 | pi6 = (struct in6_pktinfo *)CMSG_DATA(cm); | |
425 | if (pi6) { | |
f43a14d2 | 426 | local->sa_sin6.sin6_family = AF_INET6; |
e9e2c950 | 427 | local->sa_sin6.sin6_addr = pi6->ipi6_addr; |
f43a14d2 RZ |
428 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
429 | local->sa_sin6.sin6_len = sizeof(local->sa_sin6); | |
430 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
80edb675 | 431 | |
43adc702 | 432 | ifindex = pi6->ipi6_ifindex; |
80edb675 RZ |
433 | ifp = if_lookup_by_index(ifindex, VRF_DEFAULT); |
434 | if (ifp == NULL) | |
435 | break; | |
436 | ||
437 | if (strlcpy(port, ifp->name, portlen) | |
438 | >= portlen) | |
439 | log_debug( | |
440 | "ipv6-recv: interface name truncated"); | |
e9e2c950 RZ |
441 | } |
442 | } | |
443 | } | |
444 | ||
43adc702 RZ |
445 | /* Set scope ID for link local addresses. */ |
446 | if (IN6_IS_ADDR_LINKLOCAL(&peer->sa_sin6.sin6_addr)) | |
447 | peer->sa_sin6.sin6_scope_id = ifindex; | |
448 | if (IN6_IS_ADDR_LINKLOCAL(&local->sa_sin6.sin6_addr)) | |
449 | local->sa_sin6.sin6_scope_id = ifindex; | |
450 | ||
e9e2c950 RZ |
451 | return mlen; |
452 | } | |
453 | ||
454 | static void bfd_sd_reschedule(int sd) | |
455 | { | |
456 | if (sd == bglobal.bg_shop) { | |
8529e180 | 457 | THREAD_OFF(bglobal.bg_ev[0]); |
e9e2c950 RZ |
458 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop, |
459 | &bglobal.bg_ev[0]); | |
460 | } else if (sd == bglobal.bg_mhop) { | |
8529e180 | 461 | THREAD_OFF(bglobal.bg_ev[1]); |
e9e2c950 RZ |
462 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop, |
463 | &bglobal.bg_ev[1]); | |
464 | } else if (sd == bglobal.bg_shop6) { | |
8529e180 | 465 | THREAD_OFF(bglobal.bg_ev[2]); |
e9e2c950 RZ |
466 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop6, |
467 | &bglobal.bg_ev[2]); | |
468 | } else if (sd == bglobal.bg_mhop6) { | |
8529e180 | 469 | THREAD_OFF(bglobal.bg_ev[3]); |
e9e2c950 RZ |
470 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop6, |
471 | &bglobal.bg_ev[3]); | |
472 | } else if (sd == bglobal.bg_echo) { | |
8529e180 | 473 | THREAD_OFF(bglobal.bg_ev[4]); |
e9e2c950 RZ |
474 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echo, |
475 | &bglobal.bg_ev[4]); | |
2f11c53f | 476 | } else if (sd == bglobal.bg_echov6) { |
8529e180 | 477 | THREAD_OFF(bglobal.bg_ev[5]); |
2f11c53f RZ |
478 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echov6, |
479 | &bglobal.bg_ev[5]); | |
e9e2c950 RZ |
480 | } |
481 | } | |
482 | ||
03e7f088 RZ |
483 | static void cp_debug(bool mhop, struct sockaddr_any *peer, |
484 | struct sockaddr_any *local, const char *port, | |
485 | const char *vrf, const char *fmt, ...) | |
486 | { | |
487 | char buf[512], peerstr[128], localstr[128], portstr[64], vrfstr[64]; | |
488 | va_list vl; | |
489 | ||
490 | if (peer->sa_sin.sin_family) | |
491 | snprintf(peerstr, sizeof(peerstr), " peer:%s", satostr(peer)); | |
492 | else | |
493 | peerstr[0] = 0; | |
494 | ||
495 | if (local->sa_sin.sin_family) | |
496 | snprintf(localstr, sizeof(localstr), " local:%s", | |
497 | satostr(local)); | |
498 | else | |
499 | localstr[0] = 0; | |
500 | ||
501 | if (port[0]) | |
502 | snprintf(portstr, sizeof(portstr), " port:%s", port); | |
503 | else | |
504 | portstr[0] = 0; | |
505 | ||
506 | if (vrf[0]) | |
507 | snprintf(vrfstr, sizeof(vrfstr), " vrf:%s", port); | |
508 | else | |
509 | vrfstr[0] = 0; | |
510 | ||
511 | va_start(vl, fmt); | |
512 | vsnprintf(buf, sizeof(buf), fmt, vl); | |
513 | va_end(vl); | |
514 | ||
515 | log_debug("control-packet: %s [mhop:%s%s%s%s%s]", buf, | |
516 | mhop ? "yes" : "no", peerstr, localstr, portstr, vrfstr); | |
517 | } | |
518 | ||
e9e2c950 RZ |
519 | int bfd_recv_cb(struct thread *t) |
520 | { | |
521 | int sd = THREAD_FD(t); | |
522 | struct bfd_session *bfd; | |
523 | struct bfd_pkt *cp; | |
8a9f760e | 524 | bool is_mhop; |
e9e2c950 | 525 | ssize_t mlen = 0; |
50571b2e | 526 | uint8_t ttl; |
e9e2c950 RZ |
527 | struct sockaddr_any local, peer; |
528 | char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1]; | |
50571b2e | 529 | uint8_t msgbuf[1516]; |
e9e2c950 RZ |
530 | |
531 | /* Schedule next read. */ | |
532 | bfd_sd_reschedule(sd); | |
533 | ||
03e7f088 | 534 | /* Handle echo packets. */ |
2f11c53f | 535 | if (sd == bglobal.bg_echo || sd == bglobal.bg_echov6) { |
e9e2c950 RZ |
536 | ptm_bfd_process_echo_pkt(sd); |
537 | return 0; | |
538 | } | |
539 | ||
ff98a589 RZ |
540 | /* Sanitize input/output. */ |
541 | memset(port, 0, sizeof(port)); | |
542 | memset(vrfname, 0, sizeof(vrfname)); | |
543 | memset(&local, 0, sizeof(local)); | |
544 | memset(&peer, 0, sizeof(peer)); | |
545 | ||
03e7f088 | 546 | /* Handle control packets. */ |
8a9f760e | 547 | is_mhop = false; |
e9e2c950 RZ |
548 | if (sd == bglobal.bg_shop || sd == bglobal.bg_mhop) { |
549 | is_mhop = sd == bglobal.bg_mhop; | |
50571b2e RZ |
550 | mlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), &ttl, port, |
551 | sizeof(port), vrfname, sizeof(vrfname), | |
552 | &local, &peer); | |
e9e2c950 RZ |
553 | } else if (sd == bglobal.bg_shop6 || sd == bglobal.bg_mhop6) { |
554 | is_mhop = sd == bglobal.bg_mhop6; | |
50571b2e RZ |
555 | mlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), &ttl, port, |
556 | sizeof(port), vrfname, sizeof(vrfname), | |
557 | &local, &peer); | |
e9e2c950 | 558 | } |
e9e2c950 RZ |
559 | |
560 | /* Implement RFC 5880 6.8.6 */ | |
561 | if (mlen < BFD_PKT_LEN) { | |
03e7f088 RZ |
562 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
563 | "too small (%ld bytes)", mlen); | |
e9e2c950 RZ |
564 | return 0; |
565 | } | |
566 | ||
50571b2e RZ |
567 | /* Validate packet TTL. */ |
568 | if ((is_mhop == false) && (ttl != BFD_TTL_VAL)) { | |
569 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
570 | "invalid TTL: %d expected %d", ttl, BFD_TTL_VAL); | |
571 | return 0; | |
572 | } | |
573 | ||
03e7f088 RZ |
574 | /* |
575 | * Parse the control header for inconsistencies: | |
576 | * - Invalid version; | |
577 | * - Bad multiplier configuration; | |
578 | * - Short packets; | |
579 | * - Invalid discriminator; | |
580 | */ | |
16084964 | 581 | cp = (struct bfd_pkt *)(msgbuf); |
e9e2c950 | 582 | if (BFD_GETVER(cp->diag) != BFD_VERSION) { |
03e7f088 RZ |
583 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
584 | "bad version %d", BFD_GETVER(cp->diag)); | |
e9e2c950 RZ |
585 | return 0; |
586 | } | |
587 | ||
588 | if (cp->detect_mult == 0) { | |
03e7f088 RZ |
589 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
590 | "detect multiplier set to zero"); | |
e9e2c950 RZ |
591 | return 0; |
592 | } | |
593 | ||
594 | if ((cp->len < BFD_PKT_LEN) || (cp->len > mlen)) { | |
03e7f088 | 595 | cp_debug(is_mhop, &peer, &local, port, vrfname, "too small"); |
e9e2c950 RZ |
596 | return 0; |
597 | } | |
598 | ||
599 | if (cp->discrs.my_discr == 0) { | |
03e7f088 RZ |
600 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
601 | "'my discriminator' is zero"); | |
e9e2c950 RZ |
602 | return 0; |
603 | } | |
604 | ||
03e7f088 | 605 | /* Find the session that this packet belongs. */ |
e9e2c950 RZ |
606 | bfd = ptm_bfd_sess_find(cp, port, &peer, &local, vrfname, is_mhop); |
607 | if (bfd == NULL) { | |
03e7f088 RZ |
608 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
609 | "no session found"); | |
e9e2c950 RZ |
610 | return 0; |
611 | } | |
612 | ||
e9e2c950 | 613 | bfd->stats.rx_ctrl_pkt++; |
03e7f088 RZ |
614 | |
615 | /* | |
616 | * Multi hop: validate packet TTL. | |
617 | * Single hop: set local address that received the packet. | |
618 | */ | |
e9e2c950 | 619 | if (is_mhop) { |
6e01e275 | 620 | if ((BFD_TTL_VAL - bfd->mh_ttl) > BFD_TTL_VAL) { |
03e7f088 RZ |
621 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
622 | "exceeded max hop count (expected %d, got %d)", | |
6e01e275 | 623 | bfd->mh_ttl, BFD_TTL_VAL); |
e9e2c950 RZ |
624 | return 0; |
625 | } | |
626 | } else if (bfd->local_ip.sa_sin.sin_family == AF_UNSPEC) { | |
627 | bfd->local_ip = local; | |
628 | } | |
629 | ||
630 | /* | |
631 | * If no interface was detected, save the interface where the | |
632 | * packet came in. | |
633 | */ | |
80edb675 RZ |
634 | if (bfd->ifp == NULL) |
635 | bfd->ifp = if_lookup_by_name(port, VRF_DEFAULT); | |
e9e2c950 | 636 | |
03e7f088 | 637 | /* Log remote discriminator changes. */ |
e9e2c950 | 638 | if ((bfd->discrs.remote_discr != 0) |
03e7f088 RZ |
639 | && (bfd->discrs.remote_discr != ntohl(cp->discrs.my_discr))) |
640 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
641 | "remote discriminator mismatch (expected %d, got %d)", | |
642 | bfd->discrs.remote_discr, ntohl(cp->discrs.my_discr)); | |
e9e2c950 RZ |
643 | |
644 | bfd->discrs.remote_discr = ntohl(cp->discrs.my_discr); | |
645 | ||
e9e2c950 RZ |
646 | /* Save remote diagnostics before state switch. */ |
647 | bfd->remote_diag = cp->diag & BFD_DIAGMASK; | |
648 | ||
c0ef9a8a RZ |
649 | /* Update remote timers settings. */ |
650 | bfd->remote_timers.desired_min_tx = ntohl(cp->timers.desired_min_tx); | |
651 | bfd->remote_timers.required_min_rx = ntohl(cp->timers.required_min_rx); | |
652 | bfd->remote_timers.required_min_echo = | |
653 | ntohl(cp->timers.required_min_echo); | |
654 | bfd->remote_detect_mult = cp->detect_mult; | |
655 | ||
aef131af RZ |
656 | /* State switch from section 6.2. */ |
657 | bs_state_handler(bfd, BFD_GETSTATE(cp->flags)); | |
e9e2c950 | 658 | |
c0ef9a8a RZ |
659 | /* RFC 5880, Section 6.5: handle POLL/FINAL negotiation sequence. */ |
660 | if (bfd->polling && BFD_GETFBIT(cp->flags)) { | |
661 | /* Disable pooling. */ | |
662 | bfd->polling = 0; | |
e9e2c950 | 663 | |
c0ef9a8a RZ |
664 | /* Handle poll finalization. */ |
665 | bs_final_handler(bfd); | |
666 | } else { | |
667 | /* Received a packet, lets update the receive timer. */ | |
668 | bfd_recvtimer_update(bfd); | |
e9e2c950 RZ |
669 | } |
670 | ||
c0ef9a8a RZ |
671 | /* Handle echo timers changes. */ |
672 | bs_echo_timer_handler(bfd); | |
e9e2c950 RZ |
673 | |
674 | /* | |
c0ef9a8a RZ |
675 | * We've received a packet with the POLL bit set, we must send |
676 | * a control packet back with the FINAL bit set. | |
677 | * | |
678 | * RFC 5880, Section 6.5. | |
e9e2c950 | 679 | */ |
c0ef9a8a RZ |
680 | if (BFD_GETPBIT(cp->flags)) |
681 | ptm_bfd_snd(bfd, 1); | |
e9e2c950 RZ |
682 | |
683 | return 0; | |
684 | } | |
685 | ||
2f11c53f RZ |
686 | /* |
687 | * bp_bfd_echo_in: proccesses an BFD echo packet. On TTL == BFD_TTL_VAL | |
688 | * the packet is looped back or returns the my discriminator ID along | |
689 | * with the TTL. | |
690 | * | |
691 | * Returns -1 on error or loopback or 0 on success. | |
692 | */ | |
693 | int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr) | |
694 | { | |
695 | struct bfd_echo_pkt *bep; | |
696 | ssize_t rlen; | |
697 | struct sockaddr_any local, peer; | |
698 | char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1]; | |
699 | uint8_t msgbuf[1516]; | |
700 | ||
701 | if (sd == bglobal.bg_echo) | |
702 | rlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), ttl, port, | |
703 | sizeof(port), vrfname, sizeof(vrfname), | |
704 | &local, &peer); | |
705 | else | |
706 | rlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), ttl, port, | |
707 | sizeof(port), vrfname, sizeof(vrfname), | |
708 | &local, &peer); | |
709 | ||
710 | /* Short packet, better not risk reading it. */ | |
711 | if (rlen < (ssize_t)sizeof(*bep)) { | |
712 | cp_debug(false, &peer, &local, port, vrfname, | |
713 | "small echo packet"); | |
714 | return -1; | |
715 | } | |
716 | ||
717 | /* Test for loopback. */ | |
718 | if (*ttl == BFD_TTL_VAL) { | |
719 | bp_udp_send(sd, *ttl - 1, msgbuf, rlen, | |
720 | (struct sockaddr *)&peer, | |
721 | (sd == bglobal.bg_echo) ? sizeof(peer.sa_sin) | |
722 | : sizeof(peer.sa_sin6)); | |
723 | return -1; | |
724 | } | |
725 | ||
726 | /* Read my discriminator from BFD Echo packet. */ | |
727 | bep = (struct bfd_echo_pkt *)msgbuf; | |
728 | *my_discr = ntohl(bep->my_discr); | |
729 | if (*my_discr == 0) { | |
730 | cp_debug(false, &peer, &local, port, vrfname, | |
731 | "invalid echo packet discriminator (zero)"); | |
732 | return -1; | |
733 | } | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, | |
739 | struct sockaddr *to, socklen_t tolen) | |
740 | { | |
741 | struct cmsghdr *cmsg; | |
742 | ssize_t wlen; | |
743 | int ttlval = ttl; | |
744 | bool is_ipv6 = to->sa_family == AF_INET6; | |
745 | struct msghdr msg; | |
746 | struct iovec iov[1]; | |
747 | uint8_t msgctl[255]; | |
748 | ||
749 | /* Prepare message data. */ | |
750 | iov[0].iov_base = data; | |
751 | iov[0].iov_len = datalen; | |
752 | ||
753 | memset(&msg, 0, sizeof(msg)); | |
754 | memset(msgctl, 0, sizeof(msgctl)); | |
755 | msg.msg_name = to; | |
756 | msg.msg_namelen = tolen; | |
757 | msg.msg_iov = iov; | |
758 | msg.msg_iovlen = 1; | |
759 | ||
760 | /* Prepare the packet TTL information. */ | |
761 | if (ttl > 0) { | |
762 | /* Use ancillary data. */ | |
763 | msg.msg_control = msgctl; | |
764 | msg.msg_controllen = CMSG_LEN(sizeof(ttlval)); | |
765 | ||
766 | /* Configure the ancillary data. */ | |
767 | cmsg = CMSG_FIRSTHDR(&msg); | |
768 | cmsg->cmsg_len = CMSG_LEN(sizeof(ttlval)); | |
769 | if (is_ipv6) { | |
770 | cmsg->cmsg_level = IPPROTO_IPV6; | |
771 | cmsg->cmsg_type = IPV6_HOPLIMIT; | |
772 | } else { | |
773 | #if BFD_LINUX | |
774 | cmsg->cmsg_level = IPPROTO_IP; | |
775 | cmsg->cmsg_type = IP_TTL; | |
776 | #else | |
777 | /* FreeBSD does not support TTL in ancillary data. */ | |
778 | msg.msg_control = NULL; | |
779 | msg.msg_controllen = 0; | |
780 | ||
781 | bp_set_ttl(sd, ttl); | |
782 | #endif /* BFD_BSD */ | |
783 | } | |
784 | memcpy(CMSG_DATA(cmsg), &ttlval, sizeof(ttlval)); | |
785 | } | |
786 | ||
787 | /* Send echo back. */ | |
788 | wlen = sendmsg(sd, &msg, 0); | |
789 | if (wlen <= 0) { | |
790 | log_debug("udp-send: loopback failure: (%d) %s", errno, strerror(errno)); | |
791 | return -1; | |
792 | } else if (wlen < (ssize_t)datalen) { | |
793 | log_debug("udp-send: partial send: %ld expected %ld", wlen, | |
794 | datalen); | |
795 | return -1; | |
796 | } | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
e9e2c950 RZ |
801 | |
802 | /* | |
803 | * Sockets creation. | |
804 | */ | |
805 | ||
806 | ||
807 | /* | |
808 | * IPv4 sockets | |
809 | */ | |
6e01e275 | 810 | int bp_set_ttl(int sd, uint8_t value) |
e9e2c950 | 811 | { |
6e01e275 RZ |
812 | int ttl = value; |
813 | ||
814 | if (setsockopt(sd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) { | |
815 | log_warning("set-ttl: setsockopt(IP_TTL, %d): %s", value, | |
e9e2c950 RZ |
816 | strerror(errno)); |
817 | return -1; | |
818 | } | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
6e01e275 | 823 | int bp_set_tos(int sd, uint8_t value) |
e9e2c950 | 824 | { |
6e01e275 RZ |
825 | int tos = value; |
826 | ||
827 | if (setsockopt(sd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) { | |
828 | log_warning("set-tos: setsockopt(IP_TOS, %d): %s", value, | |
e9e2c950 RZ |
829 | strerror(errno)); |
830 | return -1; | |
831 | } | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
836 | static void bp_set_ipopts(int sd) | |
837 | { | |
6e01e275 RZ |
838 | int rcvttl = BFD_RCV_TTL_VAL; |
839 | ||
840 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) | |
841 | log_fatal("set-ipopts: TTL configuration failed"); | |
e9e2c950 RZ |
842 | |
843 | if (setsockopt(sd, IPPROTO_IP, IP_RECVTTL, &rcvttl, sizeof(rcvttl)) | |
844 | == -1) | |
6e01e275 | 845 | log_fatal("set-ipopts: setsockopt(IP_RECVTTL, %d): %s", rcvttl, |
e9e2c950 RZ |
846 | strerror(errno)); |
847 | ||
848 | #ifdef BFD_LINUX | |
849 | int pktinfo = BFD_PKT_INFO_VAL; | |
6e01e275 | 850 | |
e9e2c950 RZ |
851 | /* Figure out address and interface to do the peer matching. */ |
852 | if (setsockopt(sd, IPPROTO_IP, IP_PKTINFO, &pktinfo, sizeof(pktinfo)) | |
853 | == -1) | |
6e01e275 | 854 | log_fatal("set-ipopts: setsockopt(IP_PKTINFO, %d): %s", pktinfo, |
e9e2c950 RZ |
855 | strerror(errno)); |
856 | #endif /* BFD_LINUX */ | |
857 | #ifdef BFD_BSD | |
858 | int yes = 1; | |
859 | ||
860 | /* Find out our address for peer matching. */ | |
861 | if (setsockopt(sd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) == -1) | |
6e01e275 | 862 | log_fatal("set-ipopts: setsockopt(IP_RECVDSTADDR, %d): %s", yes, |
e9e2c950 RZ |
863 | strerror(errno)); |
864 | ||
865 | /* Find out interface where the packet came in. */ | |
866 | if (setsockopt_ifindex(AF_INET, sd, yes) == -1) | |
6e01e275 | 867 | log_fatal("set-ipopts: setsockopt_ipv4_ifindex(%d): %s", yes, |
e9e2c950 RZ |
868 | strerror(errno)); |
869 | #endif /* BFD_BSD */ | |
870 | } | |
871 | ||
872 | static void bp_bind_ip(int sd, uint16_t port) | |
873 | { | |
874 | struct sockaddr_in sin; | |
875 | ||
876 | memset(&sin, 0, sizeof(sin)); | |
877 | sin.sin_family = AF_INET; | |
878 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
879 | sin.sin_port = htons(port); | |
880 | if (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1) | |
6e01e275 | 881 | log_fatal("bind-ip: bind: %s", strerror(errno)); |
e9e2c950 RZ |
882 | } |
883 | ||
884 | int bp_udp_shop(void) | |
885 | { | |
886 | int sd; | |
887 | ||
888 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
889 | if (sd == -1) | |
6e01e275 | 890 | log_fatal("udp-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
891 | |
892 | bp_set_ipopts(sd); | |
893 | bp_bind_ip(sd, BFD_DEFDESTPORT); | |
894 | ||
895 | return sd; | |
896 | } | |
897 | ||
898 | int bp_udp_mhop(void) | |
899 | { | |
900 | int sd; | |
901 | ||
902 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
903 | if (sd == -1) | |
6e01e275 | 904 | log_fatal("udp-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
905 | |
906 | bp_set_ipopts(sd); | |
907 | bp_bind_ip(sd, BFD_DEF_MHOP_DEST_PORT); | |
908 | ||
909 | return sd; | |
910 | } | |
911 | ||
912 | int bp_peer_socket(struct bfd_peer_cfg *bpc) | |
913 | { | |
914 | int sd, pcount; | |
915 | struct sockaddr_in sin; | |
916 | static int srcPort = BFD_SRCPORTINIT; | |
917 | ||
918 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
919 | if (sd == -1) { |
920 | log_error("ipv4-new: failed to create socket: %s", | |
921 | strerror(errno)); | |
e9e2c950 | 922 | return -1; |
03e7f088 | 923 | } |
e9e2c950 | 924 | |
8a9f760e RZ |
925 | /* Set TTL to 255 for all transmitted packets */ |
926 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) { | |
927 | close(sd); | |
928 | return -1; | |
e9e2c950 RZ |
929 | } |
930 | ||
931 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 932 | if (bp_set_tos(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
933 | close(sd); |
934 | return -1; | |
935 | } | |
936 | ||
8a9f760e | 937 | if (bpc->bpc_has_localif) { |
e9e2c950 RZ |
938 | if (bp_bind_dev(sd, bpc->bpc_localif) != 0) { |
939 | close(sd); | |
940 | return -1; | |
941 | } | |
942 | } else if (bpc->bpc_mhop && bpc->bpc_has_vrfname) { | |
943 | if (bp_bind_dev(sd, bpc->bpc_vrfname) != 0) { | |
944 | close(sd); | |
945 | return -1; | |
946 | } | |
947 | } | |
948 | ||
949 | /* Find an available source port in the proper range */ | |
950 | memset(&sin, 0, sizeof(sin)); | |
951 | sin = bpc->bpc_local.sa_sin; | |
952 | sin.sin_family = AF_INET; | |
953 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
954 | sin.sin_len = sizeof(sin); | |
955 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
8a9f760e | 956 | if (bpc->bpc_mhop) |
e9e2c950 RZ |
957 | sin.sin_addr = bpc->bpc_local.sa_sin.sin_addr; |
958 | else | |
959 | sin.sin_addr.s_addr = INADDR_ANY; | |
960 | ||
961 | pcount = 0; | |
962 | do { | |
963 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
964 | /* Searched all ports, none available */ | |
03e7f088 RZ |
965 | log_error("ipv4-new: failed to bind port: %s", |
966 | strerror(errno)); | |
e9e2c950 RZ |
967 | close(sd); |
968 | return -1; | |
969 | } | |
970 | if (srcPort >= BFD_SRCPORTMAX) | |
971 | srcPort = BFD_SRCPORTINIT; | |
972 | sin.sin_port = htons(srcPort++); | |
973 | } while (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) < 0); | |
974 | ||
975 | return sd; | |
976 | } | |
977 | ||
978 | ||
979 | /* | |
980 | * IPv6 sockets | |
981 | */ | |
982 | ||
983 | int bp_peer_socketv6(struct bfd_peer_cfg *bpc) | |
984 | { | |
80edb675 RZ |
985 | struct interface *ifp; |
986 | int sd, pcount; | |
e9e2c950 RZ |
987 | struct sockaddr_in6 sin6; |
988 | static int srcPort = BFD_SRCPORTINIT; | |
989 | ||
990 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
991 | if (sd == -1) { |
992 | log_error("ipv6-new: failed to create socket: %s", | |
993 | strerror(errno)); | |
e9e2c950 | 994 | return -1; |
03e7f088 | 995 | } |
e9e2c950 | 996 | |
8a9f760e RZ |
997 | /* Set TTL to 255 for all transmitted packets */ |
998 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) != 0) { | |
999 | close(sd); | |
1000 | return -1; | |
e9e2c950 RZ |
1001 | } |
1002 | ||
1003 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 1004 | if (bp_set_tosv6(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
1005 | close(sd); |
1006 | return -1; | |
1007 | } | |
1008 | ||
1009 | /* Find an available source port in the proper range */ | |
1010 | memset(&sin6, 0, sizeof(sin6)); | |
1011 | sin6.sin6_family = AF_INET6; | |
1012 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1013 | sin6.sin6_len = sizeof(sin6); | |
1014 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1015 | sin6 = bpc->bpc_local.sa_sin6; | |
80edb675 RZ |
1016 | if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) { |
1017 | ifp = if_lookup_by_name(bpc->bpc_localif, VRF_DEFAULT); | |
1018 | sin6.sin6_scope_id = | |
1019 | (ifp != NULL) ? ifp->ifindex : IFINDEX_INTERNAL; | |
1020 | } | |
e9e2c950 RZ |
1021 | |
1022 | if (bpc->bpc_has_localif) { | |
1023 | if (bp_bind_dev(sd, bpc->bpc_localif) != 0) { | |
1024 | close(sd); | |
1025 | return -1; | |
1026 | } | |
1027 | } else if (bpc->bpc_mhop && bpc->bpc_has_vrfname) { | |
1028 | if (bp_bind_dev(sd, bpc->bpc_vrfname) != 0) { | |
1029 | close(sd); | |
1030 | return -1; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | pcount = 0; | |
1035 | do { | |
1036 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
1037 | /* Searched all ports, none available */ | |
03e7f088 RZ |
1038 | log_error("ipv6-new: failed to bind port: %s", |
1039 | strerror(errno)); | |
e9e2c950 RZ |
1040 | close(sd); |
1041 | return -1; | |
1042 | } | |
1043 | if (srcPort >= BFD_SRCPORTMAX) | |
1044 | srcPort = BFD_SRCPORTINIT; | |
1045 | sin6.sin6_port = htons(srcPort++); | |
1046 | } while (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) < 0); | |
1047 | ||
1048 | return sd; | |
1049 | } | |
1050 | ||
6e01e275 | 1051 | int bp_set_ttlv6(int sd, uint8_t value) |
e9e2c950 | 1052 | { |
6e01e275 RZ |
1053 | int ttl = value; |
1054 | ||
1055 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) | |
e9e2c950 | 1056 | == -1) { |
6e01e275 RZ |
1057 | log_warning("set-ttlv6: setsockopt(IPV6_UNICAST_HOPS, %d): %s", |
1058 | value, strerror(errno)); | |
e9e2c950 RZ |
1059 | return -1; |
1060 | } | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
6e01e275 | 1065 | int bp_set_tosv6(int sd, uint8_t value) |
e9e2c950 | 1066 | { |
6e01e275 RZ |
1067 | int tos = value; |
1068 | ||
1069 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) | |
e9e2c950 | 1070 | == -1) { |
6e01e275 | 1071 | log_warning("set-tosv6: setsockopt(IPV6_TCLASS, %d): %s", value, |
e9e2c950 RZ |
1072 | strerror(errno)); |
1073 | return -1; | |
1074 | } | |
1075 | ||
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | static void bp_set_ipv6opts(int sd) | |
1080 | { | |
6e01e275 RZ |
1081 | int ipv6_pktinfo = BFD_IPV6_PKT_INFO_VAL; |
1082 | int ipv6_only = BFD_IPV6_ONLY_VAL; | |
e9e2c950 | 1083 | |
6e01e275 RZ |
1084 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) == -1) |
1085 | log_fatal("set-ipv6opts: setsockopt(IPV6_UNICAST_HOPS, %d): %s", | |
1086 | BFD_TTL_VAL, strerror(errno)); | |
e9e2c950 | 1087 | |
6e01e275 RZ |
1088 | if (setsockopt_ipv6_hoplimit(sd, BFD_RCV_TTL_VAL) == -1) |
1089 | log_fatal("set-ipv6opts: setsockopt(IPV6_HOPLIMIT, %d): %s", | |
1090 | BFD_RCV_TTL_VAL, strerror(errno)); | |
e9e2c950 RZ |
1091 | |
1092 | if (setsockopt_ipv6_pktinfo(sd, ipv6_pktinfo) == -1) | |
6e01e275 RZ |
1093 | log_fatal("set-ipv6opts: setsockopt(IPV6_PKTINFO, %d): %s", |
1094 | ipv6_pktinfo, strerror(errno)); | |
e9e2c950 RZ |
1095 | |
1096 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6_only, | |
1097 | sizeof(ipv6_only)) | |
1098 | == -1) | |
6e01e275 RZ |
1099 | log_fatal("set-ipv6opts: setsockopt(IPV6_V6ONLY, %d): %s", |
1100 | ipv6_only, strerror(errno)); | |
e9e2c950 RZ |
1101 | } |
1102 | ||
1103 | static void bp_bind_ipv6(int sd, uint16_t port) | |
1104 | { | |
1105 | struct sockaddr_in6 sin6; | |
1106 | ||
1107 | memset(&sin6, 0, sizeof(sin6)); | |
1108 | sin6.sin6_family = AF_INET6; | |
1109 | sin6.sin6_addr = in6addr_any; | |
1110 | sin6.sin6_port = htons(port); | |
1111 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1112 | sin6.sin6_len = sizeof(sin6); | |
1113 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1114 | if (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) == -1) | |
6e01e275 | 1115 | log_fatal("bind-ipv6: bind: %s", strerror(errno)); |
e9e2c950 RZ |
1116 | } |
1117 | ||
1118 | int bp_udp6_shop(void) | |
1119 | { | |
1120 | int sd; | |
1121 | ||
1122 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1123 | if (sd == -1) | |
6e01e275 | 1124 | log_fatal("udp6-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1125 | |
1126 | bp_set_ipv6opts(sd); | |
1127 | bp_bind_ipv6(sd, BFD_DEFDESTPORT); | |
1128 | ||
1129 | return sd; | |
1130 | } | |
1131 | ||
1132 | int bp_udp6_mhop(void) | |
1133 | { | |
1134 | int sd; | |
1135 | ||
1136 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1137 | if (sd == -1) | |
6e01e275 | 1138 | log_fatal("udp6-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1139 | |
1140 | bp_set_ipv6opts(sd); | |
1141 | bp_bind_ipv6(sd, BFD_DEF_MHOP_DEST_PORT); | |
1142 | ||
1143 | return sd; | |
1144 | } | |
2f11c53f RZ |
1145 | |
1146 | int bp_echo_socket(void) | |
1147 | { | |
1148 | int s; | |
1149 | ||
1150 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
1151 | if (s == -1) | |
1152 | log_fatal("echo-socket: socket: %s", strerror(errno)); | |
1153 | ||
1154 | bp_set_ipopts(s); | |
1155 | bp_bind_ip(s, BFD_DEF_ECHO_PORT); | |
1156 | ||
1157 | return s; | |
1158 | } | |
1159 | ||
1160 | int bp_echov6_socket(void) | |
1161 | { | |
1162 | int s; | |
1163 | ||
1164 | s = socket(AF_INET6, SOCK_DGRAM, 0); | |
1165 | if (s == -1) | |
1166 | log_fatal("echov6-socket: socket: %s", strerror(errno)); | |
1167 | ||
1168 | bp_set_ipv6opts(s); | |
1169 | bp_bind_ipv6(s, BFD_DEF_ECHO_PORT); | |
1170 | ||
1171 | return s; | |
1172 | } |