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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); | |
0592db96 RZ |
216 | |
217 | /* | |
218 | * Polling and Final can't be set at the same time. | |
219 | * | |
220 | * RFC 5880, Section 6.5. | |
221 | */ | |
e9e2c950 | 222 | BFD_SETFBIT(cp.flags, fbit); |
0592db96 RZ |
223 | if (fbit == 0) |
224 | BFD_SETPBIT(cp.flags, bfd->polling); | |
225 | ||
e9e2c950 RZ |
226 | cp.detect_mult = bfd->detect_mult; |
227 | cp.len = BFD_PKT_LEN; | |
228 | cp.discrs.my_discr = htonl(bfd->discrs.my_discr); | |
229 | cp.discrs.remote_discr = htonl(bfd->discrs.remote_discr); | |
230 | if (bfd->polling) { | |
231 | cp.timers.desired_min_tx = | |
f43b9368 | 232 | htonl(bfd->timers.desired_min_tx); |
e9e2c950 | 233 | cp.timers.required_min_rx = |
f43b9368 | 234 | htonl(bfd->timers.required_min_rx); |
e9e2c950 | 235 | } else { |
f43b9368 RZ |
236 | /* |
237 | * We can only announce current setting on poll, this | |
238 | * avoids timing mismatch with our peer and give it | |
239 | * the oportunity to learn. See `bs_final_handler` for | |
240 | * more information. | |
241 | */ | |
242 | cp.timers.desired_min_tx = | |
243 | htonl(bfd->cur_timers.desired_min_tx); | |
244 | cp.timers.required_min_rx = | |
245 | htonl(bfd->cur_timers.required_min_rx); | |
e9e2c950 RZ |
246 | } |
247 | cp.timers.required_min_echo = htonl(bfd->timers.required_min_echo); | |
248 | ||
2f11c53f | 249 | if (_ptm_bfd_send(bfd, NULL, &cp, BFD_PKT_LEN) != 0) |
e9e2c950 | 250 | return; |
e9e2c950 RZ |
251 | |
252 | bfd->stats.tx_ctrl_pkt++; | |
253 | } | |
254 | ||
50571b2e RZ |
255 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
256 | char *port, size_t portlen, char *vrfname, | |
257 | size_t vrfnamelen, struct sockaddr_any *local, | |
258 | struct sockaddr_any *peer) | |
e9e2c950 | 259 | { |
80edb675 | 260 | struct interface *ifp; |
e9e2c950 RZ |
261 | struct cmsghdr *cm; |
262 | int ifindex; | |
263 | ssize_t mlen; | |
16084964 RZ |
264 | struct sockaddr_in msgaddr; |
265 | struct msghdr msghdr; | |
266 | struct iovec iov[1]; | |
267 | uint8_t cmsgbuf[255]; | |
268 | ||
e10cfdaf DL |
269 | port[0] = '\0'; |
270 | ||
16084964 RZ |
271 | /* Prepare the recvmsg params. */ |
272 | iov[0].iov_base = msgbuf; | |
50571b2e | 273 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
274 | |
275 | memset(&msghdr, 0, sizeof(msghdr)); | |
276 | msghdr.msg_name = &msgaddr; | |
277 | msghdr.msg_namelen = sizeof(msgaddr); | |
278 | msghdr.msg_iov = iov; | |
279 | msghdr.msg_iovlen = 1; | |
280 | msghdr.msg_control = cmsgbuf; | |
281 | msghdr.msg_controllen = sizeof(cmsgbuf); | |
282 | ||
e9e2c950 RZ |
283 | mlen = recvmsg(sd, &msghdr, MSG_DONTWAIT); |
284 | if (mlen == -1) { | |
03e7f088 RZ |
285 | if (errno != EAGAIN) |
286 | log_error("ipv4-recv: recv failed: %s", | |
287 | strerror(errno)); | |
288 | ||
e9e2c950 RZ |
289 | return -1; |
290 | } | |
291 | ||
292 | /* Get source address */ | |
293 | peer->sa_sin = *((struct sockaddr_in *)(msghdr.msg_name)); | |
294 | ||
295 | /* Get and check TTL */ | |
296 | for (cm = CMSG_FIRSTHDR(&msghdr); cm != NULL; | |
297 | cm = CMSG_NXTHDR(&msghdr, cm)) { | |
298 | if (cm->cmsg_level != IPPROTO_IP) | |
299 | continue; | |
300 | ||
301 | switch (cm->cmsg_type) { | |
302 | #ifdef BFD_LINUX | |
303 | case IP_TTL: { | |
50571b2e RZ |
304 | uint32_t ttlval; |
305 | ||
306 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); | |
307 | if (ttlval > 255) { | |
308 | log_debug("ipv4-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
309 | return -1; |
310 | } | |
50571b2e | 311 | *ttl = ttlval; |
e9e2c950 RZ |
312 | break; |
313 | } | |
314 | ||
315 | case IP_PKTINFO: { | |
316 | struct in_pktinfo *pi = | |
317 | (struct in_pktinfo *)CMSG_DATA(cm); | |
318 | ||
319 | if (pi == NULL) | |
320 | break; | |
321 | ||
322 | local->sa_sin.sin_family = AF_INET; | |
323 | local->sa_sin.sin_addr = pi->ipi_addr; | |
f43a14d2 RZ |
324 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
325 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
326 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
80edb675 RZ |
327 | |
328 | ifp = if_lookup_by_index(pi->ipi_ifindex, VRF_DEFAULT); | |
329 | if (ifp == NULL) | |
330 | break; | |
331 | ||
332 | if (strlcpy(port, ifp->name, portlen) >= portlen) | |
333 | log_debug( | |
334 | "ipv4-recv: interface name truncated"); | |
e9e2c950 RZ |
335 | break; |
336 | } | |
337 | #endif /* BFD_LINUX */ | |
338 | #ifdef BFD_BSD | |
339 | case IP_RECVTTL: { | |
50571b2e | 340 | memcpy(ttl, CMSG_DATA(cm), sizeof(*ttl)); |
e9e2c950 RZ |
341 | break; |
342 | } | |
343 | ||
344 | case IP_RECVDSTADDR: { | |
345 | struct in_addr ia; | |
346 | ||
347 | memcpy(&ia, CMSG_DATA(cm), sizeof(ia)); | |
348 | local->sa_sin.sin_family = AF_INET; | |
349 | local->sa_sin.sin_addr = ia; | |
f43a14d2 RZ |
350 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
351 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
352 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 RZ |
353 | break; |
354 | } | |
355 | #endif /* BFD_BSD */ | |
356 | ||
357 | default: | |
358 | /* | |
359 | * On *BSDs we expect to land here when skipping | |
360 | * the IP_RECVIF header. It will be handled by | |
361 | * getsockopt_ifindex() below. | |
362 | */ | |
363 | /* NOTHING */ | |
364 | break; | |
365 | } | |
366 | } | |
367 | ||
368 | /* OS agnostic way of getting interface name. */ | |
369 | if (port[0] == 0) { | |
370 | ifindex = getsockopt_ifindex(AF_INET, &msghdr); | |
80edb675 RZ |
371 | if (ifindex <= 0) |
372 | return mlen; | |
373 | ||
374 | ifp = if_lookup_by_index(ifindex, VRF_DEFAULT); | |
375 | if (ifp == NULL) | |
376 | return mlen; | |
377 | ||
378 | if (strlcpy(port, ifp->name, portlen) >= portlen) | |
379 | log_debug("ipv4-recv: interface name truncated"); | |
e9e2c950 RZ |
380 | } |
381 | ||
382 | return mlen; | |
383 | } | |
384 | ||
50571b2e RZ |
385 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
386 | char *port, size_t portlen, char *vrfname, | |
387 | size_t vrfnamelen, struct sockaddr_any *local, | |
388 | struct sockaddr_any *peer) | |
e9e2c950 | 389 | { |
80edb675 | 390 | struct interface *ifp; |
e9e2c950 RZ |
391 | struct cmsghdr *cm; |
392 | struct in6_pktinfo *pi6 = NULL; | |
43adc702 | 393 | int ifindex = 0; |
e9e2c950 | 394 | ssize_t mlen; |
6e01e275 | 395 | uint32_t ttlval; |
16084964 RZ |
396 | struct sockaddr_in6 msgaddr6; |
397 | struct msghdr msghdr6; | |
398 | struct iovec iov[1]; | |
399 | uint8_t cmsgbuf6[255]; | |
400 | ||
401 | /* Prepare the recvmsg params. */ | |
402 | iov[0].iov_base = msgbuf; | |
50571b2e | 403 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
404 | |
405 | memset(&msghdr6, 0, sizeof(msghdr6)); | |
406 | msghdr6.msg_name = &msgaddr6; | |
407 | msghdr6.msg_namelen = sizeof(msgaddr6); | |
408 | msghdr6.msg_iov = iov; | |
409 | msghdr6.msg_iovlen = 1; | |
410 | msghdr6.msg_control = cmsgbuf6; | |
411 | msghdr6.msg_controllen = sizeof(cmsgbuf6); | |
412 | ||
e9e2c950 RZ |
413 | mlen = recvmsg(sd, &msghdr6, MSG_DONTWAIT); |
414 | if (mlen == -1) { | |
03e7f088 | 415 | if (errno != EAGAIN) |
6e01e275 | 416 | log_error("ipv6-recv: recv failed: %s", |
03e7f088 RZ |
417 | strerror(errno)); |
418 | ||
e9e2c950 RZ |
419 | return -1; |
420 | } | |
421 | ||
422 | /* Get source address */ | |
423 | peer->sa_sin6 = *((struct sockaddr_in6 *)(msghdr6.msg_name)); | |
424 | ||
425 | /* Get and check TTL */ | |
426 | for (cm = CMSG_FIRSTHDR(&msghdr6); cm != NULL; | |
427 | cm = CMSG_NXTHDR(&msghdr6, cm)) { | |
428 | if (cm->cmsg_level != IPPROTO_IPV6) | |
429 | continue; | |
430 | ||
431 | if (cm->cmsg_type == IPV6_HOPLIMIT) { | |
6e01e275 | 432 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); |
50571b2e RZ |
433 | if (ttlval > 255) { |
434 | log_debug("ipv6-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
435 | return -1; |
436 | } | |
50571b2e RZ |
437 | |
438 | *ttl = ttlval; | |
e9e2c950 RZ |
439 | } else if (cm->cmsg_type == IPV6_PKTINFO) { |
440 | pi6 = (struct in6_pktinfo *)CMSG_DATA(cm); | |
441 | if (pi6) { | |
f43a14d2 | 442 | local->sa_sin6.sin6_family = AF_INET6; |
e9e2c950 | 443 | local->sa_sin6.sin6_addr = pi6->ipi6_addr; |
f43a14d2 RZ |
444 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
445 | local->sa_sin6.sin6_len = sizeof(local->sa_sin6); | |
446 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
80edb675 | 447 | |
43adc702 | 448 | ifindex = pi6->ipi6_ifindex; |
80edb675 RZ |
449 | ifp = if_lookup_by_index(ifindex, VRF_DEFAULT); |
450 | if (ifp == NULL) | |
451 | break; | |
452 | ||
453 | if (strlcpy(port, ifp->name, portlen) | |
454 | >= portlen) | |
455 | log_debug( | |
456 | "ipv6-recv: interface name truncated"); | |
e9e2c950 RZ |
457 | } |
458 | } | |
459 | } | |
460 | ||
43adc702 RZ |
461 | /* Set scope ID for link local addresses. */ |
462 | if (IN6_IS_ADDR_LINKLOCAL(&peer->sa_sin6.sin6_addr)) | |
463 | peer->sa_sin6.sin6_scope_id = ifindex; | |
464 | if (IN6_IS_ADDR_LINKLOCAL(&local->sa_sin6.sin6_addr)) | |
465 | local->sa_sin6.sin6_scope_id = ifindex; | |
466 | ||
e9e2c950 RZ |
467 | return mlen; |
468 | } | |
469 | ||
470 | static void bfd_sd_reschedule(int sd) | |
471 | { | |
472 | if (sd == bglobal.bg_shop) { | |
8529e180 | 473 | THREAD_OFF(bglobal.bg_ev[0]); |
e9e2c950 RZ |
474 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop, |
475 | &bglobal.bg_ev[0]); | |
476 | } else if (sd == bglobal.bg_mhop) { | |
8529e180 | 477 | THREAD_OFF(bglobal.bg_ev[1]); |
e9e2c950 RZ |
478 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop, |
479 | &bglobal.bg_ev[1]); | |
480 | } else if (sd == bglobal.bg_shop6) { | |
8529e180 | 481 | THREAD_OFF(bglobal.bg_ev[2]); |
e9e2c950 RZ |
482 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop6, |
483 | &bglobal.bg_ev[2]); | |
484 | } else if (sd == bglobal.bg_mhop6) { | |
8529e180 | 485 | THREAD_OFF(bglobal.bg_ev[3]); |
e9e2c950 RZ |
486 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop6, |
487 | &bglobal.bg_ev[3]); | |
488 | } else if (sd == bglobal.bg_echo) { | |
8529e180 | 489 | THREAD_OFF(bglobal.bg_ev[4]); |
e9e2c950 RZ |
490 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echo, |
491 | &bglobal.bg_ev[4]); | |
2f11c53f | 492 | } else if (sd == bglobal.bg_echov6) { |
8529e180 | 493 | THREAD_OFF(bglobal.bg_ev[5]); |
2f11c53f RZ |
494 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echov6, |
495 | &bglobal.bg_ev[5]); | |
e9e2c950 RZ |
496 | } |
497 | } | |
498 | ||
03e7f088 RZ |
499 | static void cp_debug(bool mhop, struct sockaddr_any *peer, |
500 | struct sockaddr_any *local, const char *port, | |
501 | const char *vrf, const char *fmt, ...) | |
502 | { | |
503 | char buf[512], peerstr[128], localstr[128], portstr[64], vrfstr[64]; | |
504 | va_list vl; | |
505 | ||
506 | if (peer->sa_sin.sin_family) | |
507 | snprintf(peerstr, sizeof(peerstr), " peer:%s", satostr(peer)); | |
508 | else | |
509 | peerstr[0] = 0; | |
510 | ||
511 | if (local->sa_sin.sin_family) | |
512 | snprintf(localstr, sizeof(localstr), " local:%s", | |
513 | satostr(local)); | |
514 | else | |
515 | localstr[0] = 0; | |
516 | ||
517 | if (port[0]) | |
518 | snprintf(portstr, sizeof(portstr), " port:%s", port); | |
519 | else | |
520 | portstr[0] = 0; | |
521 | ||
522 | if (vrf[0]) | |
523 | snprintf(vrfstr, sizeof(vrfstr), " vrf:%s", port); | |
524 | else | |
525 | vrfstr[0] = 0; | |
526 | ||
527 | va_start(vl, fmt); | |
528 | vsnprintf(buf, sizeof(buf), fmt, vl); | |
529 | va_end(vl); | |
530 | ||
531 | log_debug("control-packet: %s [mhop:%s%s%s%s%s]", buf, | |
532 | mhop ? "yes" : "no", peerstr, localstr, portstr, vrfstr); | |
533 | } | |
534 | ||
e9e2c950 RZ |
535 | int bfd_recv_cb(struct thread *t) |
536 | { | |
537 | int sd = THREAD_FD(t); | |
538 | struct bfd_session *bfd; | |
539 | struct bfd_pkt *cp; | |
8a9f760e | 540 | bool is_mhop; |
e9e2c950 | 541 | ssize_t mlen = 0; |
50571b2e | 542 | uint8_t ttl; |
e9e2c950 RZ |
543 | struct sockaddr_any local, peer; |
544 | char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1]; | |
50571b2e | 545 | uint8_t msgbuf[1516]; |
e9e2c950 RZ |
546 | |
547 | /* Schedule next read. */ | |
548 | bfd_sd_reschedule(sd); | |
549 | ||
03e7f088 | 550 | /* Handle echo packets. */ |
2f11c53f | 551 | if (sd == bglobal.bg_echo || sd == bglobal.bg_echov6) { |
e9e2c950 RZ |
552 | ptm_bfd_process_echo_pkt(sd); |
553 | return 0; | |
554 | } | |
555 | ||
ff98a589 RZ |
556 | /* Sanitize input/output. */ |
557 | memset(port, 0, sizeof(port)); | |
558 | memset(vrfname, 0, sizeof(vrfname)); | |
559 | memset(&local, 0, sizeof(local)); | |
560 | memset(&peer, 0, sizeof(peer)); | |
561 | ||
03e7f088 | 562 | /* Handle control packets. */ |
8a9f760e | 563 | is_mhop = false; |
e9e2c950 RZ |
564 | if (sd == bglobal.bg_shop || sd == bglobal.bg_mhop) { |
565 | is_mhop = sd == bglobal.bg_mhop; | |
50571b2e RZ |
566 | mlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), &ttl, port, |
567 | sizeof(port), vrfname, sizeof(vrfname), | |
568 | &local, &peer); | |
e9e2c950 RZ |
569 | } else if (sd == bglobal.bg_shop6 || sd == bglobal.bg_mhop6) { |
570 | is_mhop = sd == bglobal.bg_mhop6; | |
50571b2e RZ |
571 | mlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), &ttl, port, |
572 | sizeof(port), vrfname, sizeof(vrfname), | |
573 | &local, &peer); | |
e9e2c950 | 574 | } |
e9e2c950 RZ |
575 | |
576 | /* Implement RFC 5880 6.8.6 */ | |
577 | if (mlen < BFD_PKT_LEN) { | |
03e7f088 RZ |
578 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
579 | "too small (%ld bytes)", mlen); | |
e9e2c950 RZ |
580 | return 0; |
581 | } | |
582 | ||
50571b2e RZ |
583 | /* Validate packet TTL. */ |
584 | if ((is_mhop == false) && (ttl != BFD_TTL_VAL)) { | |
585 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
586 | "invalid TTL: %d expected %d", ttl, BFD_TTL_VAL); | |
587 | return 0; | |
588 | } | |
589 | ||
03e7f088 RZ |
590 | /* |
591 | * Parse the control header for inconsistencies: | |
592 | * - Invalid version; | |
593 | * - Bad multiplier configuration; | |
594 | * - Short packets; | |
595 | * - Invalid discriminator; | |
596 | */ | |
16084964 | 597 | cp = (struct bfd_pkt *)(msgbuf); |
e9e2c950 | 598 | if (BFD_GETVER(cp->diag) != BFD_VERSION) { |
03e7f088 RZ |
599 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
600 | "bad version %d", BFD_GETVER(cp->diag)); | |
e9e2c950 RZ |
601 | return 0; |
602 | } | |
603 | ||
604 | if (cp->detect_mult == 0) { | |
03e7f088 RZ |
605 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
606 | "detect multiplier set to zero"); | |
e9e2c950 RZ |
607 | return 0; |
608 | } | |
609 | ||
610 | if ((cp->len < BFD_PKT_LEN) || (cp->len > mlen)) { | |
03e7f088 | 611 | cp_debug(is_mhop, &peer, &local, port, vrfname, "too small"); |
e9e2c950 RZ |
612 | return 0; |
613 | } | |
614 | ||
615 | if (cp->discrs.my_discr == 0) { | |
03e7f088 RZ |
616 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
617 | "'my discriminator' is zero"); | |
e9e2c950 RZ |
618 | return 0; |
619 | } | |
620 | ||
03e7f088 | 621 | /* Find the session that this packet belongs. */ |
e9e2c950 RZ |
622 | bfd = ptm_bfd_sess_find(cp, port, &peer, &local, vrfname, is_mhop); |
623 | if (bfd == NULL) { | |
03e7f088 RZ |
624 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
625 | "no session found"); | |
e9e2c950 RZ |
626 | return 0; |
627 | } | |
628 | ||
e9e2c950 | 629 | bfd->stats.rx_ctrl_pkt++; |
03e7f088 RZ |
630 | |
631 | /* | |
632 | * Multi hop: validate packet TTL. | |
633 | * Single hop: set local address that received the packet. | |
634 | */ | |
e9e2c950 | 635 | if (is_mhop) { |
6e01e275 | 636 | if ((BFD_TTL_VAL - bfd->mh_ttl) > BFD_TTL_VAL) { |
03e7f088 RZ |
637 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
638 | "exceeded max hop count (expected %d, got %d)", | |
6e01e275 | 639 | bfd->mh_ttl, BFD_TTL_VAL); |
e9e2c950 RZ |
640 | return 0; |
641 | } | |
642 | } else if (bfd->local_ip.sa_sin.sin_family == AF_UNSPEC) { | |
643 | bfd->local_ip = local; | |
644 | } | |
645 | ||
646 | /* | |
647 | * If no interface was detected, save the interface where the | |
648 | * packet came in. | |
649 | */ | |
80edb675 RZ |
650 | if (bfd->ifp == NULL) |
651 | bfd->ifp = if_lookup_by_name(port, VRF_DEFAULT); | |
e9e2c950 | 652 | |
03e7f088 | 653 | /* Log remote discriminator changes. */ |
e9e2c950 | 654 | if ((bfd->discrs.remote_discr != 0) |
03e7f088 RZ |
655 | && (bfd->discrs.remote_discr != ntohl(cp->discrs.my_discr))) |
656 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
657 | "remote discriminator mismatch (expected %d, got %d)", | |
658 | bfd->discrs.remote_discr, ntohl(cp->discrs.my_discr)); | |
e9e2c950 RZ |
659 | |
660 | bfd->discrs.remote_discr = ntohl(cp->discrs.my_discr); | |
661 | ||
e9e2c950 RZ |
662 | /* Save remote diagnostics before state switch. */ |
663 | bfd->remote_diag = cp->diag & BFD_DIAGMASK; | |
664 | ||
c0ef9a8a RZ |
665 | /* Update remote timers settings. */ |
666 | bfd->remote_timers.desired_min_tx = ntohl(cp->timers.desired_min_tx); | |
667 | bfd->remote_timers.required_min_rx = ntohl(cp->timers.required_min_rx); | |
668 | bfd->remote_timers.required_min_echo = | |
669 | ntohl(cp->timers.required_min_echo); | |
670 | bfd->remote_detect_mult = cp->detect_mult; | |
671 | ||
aef131af RZ |
672 | /* State switch from section 6.2. */ |
673 | bs_state_handler(bfd, BFD_GETSTATE(cp->flags)); | |
e9e2c950 | 674 | |
c0ef9a8a RZ |
675 | /* RFC 5880, Section 6.5: handle POLL/FINAL negotiation sequence. */ |
676 | if (bfd->polling && BFD_GETFBIT(cp->flags)) { | |
677 | /* Disable pooling. */ | |
678 | bfd->polling = 0; | |
e9e2c950 | 679 | |
c0ef9a8a RZ |
680 | /* Handle poll finalization. */ |
681 | bs_final_handler(bfd); | |
682 | } else { | |
683 | /* Received a packet, lets update the receive timer. */ | |
684 | bfd_recvtimer_update(bfd); | |
e9e2c950 RZ |
685 | } |
686 | ||
c0ef9a8a RZ |
687 | /* Handle echo timers changes. */ |
688 | bs_echo_timer_handler(bfd); | |
e9e2c950 RZ |
689 | |
690 | /* | |
c0ef9a8a RZ |
691 | * We've received a packet with the POLL bit set, we must send |
692 | * a control packet back with the FINAL bit set. | |
693 | * | |
694 | * RFC 5880, Section 6.5. | |
e9e2c950 | 695 | */ |
c0ef9a8a RZ |
696 | if (BFD_GETPBIT(cp->flags)) |
697 | ptm_bfd_snd(bfd, 1); | |
e9e2c950 RZ |
698 | |
699 | return 0; | |
700 | } | |
701 | ||
2f11c53f RZ |
702 | /* |
703 | * bp_bfd_echo_in: proccesses an BFD echo packet. On TTL == BFD_TTL_VAL | |
704 | * the packet is looped back or returns the my discriminator ID along | |
705 | * with the TTL. | |
706 | * | |
707 | * Returns -1 on error or loopback or 0 on success. | |
708 | */ | |
709 | int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr) | |
710 | { | |
711 | struct bfd_echo_pkt *bep; | |
712 | ssize_t rlen; | |
713 | struct sockaddr_any local, peer; | |
714 | char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1]; | |
715 | uint8_t msgbuf[1516]; | |
716 | ||
717 | if (sd == bglobal.bg_echo) | |
718 | rlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), ttl, port, | |
719 | sizeof(port), vrfname, sizeof(vrfname), | |
720 | &local, &peer); | |
721 | else | |
722 | rlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), ttl, port, | |
723 | sizeof(port), vrfname, sizeof(vrfname), | |
724 | &local, &peer); | |
725 | ||
726 | /* Short packet, better not risk reading it. */ | |
727 | if (rlen < (ssize_t)sizeof(*bep)) { | |
728 | cp_debug(false, &peer, &local, port, vrfname, | |
729 | "small echo packet"); | |
730 | return -1; | |
731 | } | |
732 | ||
733 | /* Test for loopback. */ | |
734 | if (*ttl == BFD_TTL_VAL) { | |
735 | bp_udp_send(sd, *ttl - 1, msgbuf, rlen, | |
736 | (struct sockaddr *)&peer, | |
737 | (sd == bglobal.bg_echo) ? sizeof(peer.sa_sin) | |
738 | : sizeof(peer.sa_sin6)); | |
739 | return -1; | |
740 | } | |
741 | ||
742 | /* Read my discriminator from BFD Echo packet. */ | |
743 | bep = (struct bfd_echo_pkt *)msgbuf; | |
744 | *my_discr = ntohl(bep->my_discr); | |
745 | if (*my_discr == 0) { | |
746 | cp_debug(false, &peer, &local, port, vrfname, | |
747 | "invalid echo packet discriminator (zero)"); | |
748 | return -1; | |
749 | } | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
754 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, | |
755 | struct sockaddr *to, socklen_t tolen) | |
756 | { | |
757 | struct cmsghdr *cmsg; | |
758 | ssize_t wlen; | |
759 | int ttlval = ttl; | |
760 | bool is_ipv6 = to->sa_family == AF_INET6; | |
761 | struct msghdr msg; | |
762 | struct iovec iov[1]; | |
763 | uint8_t msgctl[255]; | |
764 | ||
765 | /* Prepare message data. */ | |
766 | iov[0].iov_base = data; | |
767 | iov[0].iov_len = datalen; | |
768 | ||
769 | memset(&msg, 0, sizeof(msg)); | |
770 | memset(msgctl, 0, sizeof(msgctl)); | |
771 | msg.msg_name = to; | |
772 | msg.msg_namelen = tolen; | |
773 | msg.msg_iov = iov; | |
774 | msg.msg_iovlen = 1; | |
775 | ||
776 | /* Prepare the packet TTL information. */ | |
777 | if (ttl > 0) { | |
778 | /* Use ancillary data. */ | |
779 | msg.msg_control = msgctl; | |
780 | msg.msg_controllen = CMSG_LEN(sizeof(ttlval)); | |
781 | ||
782 | /* Configure the ancillary data. */ | |
783 | cmsg = CMSG_FIRSTHDR(&msg); | |
784 | cmsg->cmsg_len = CMSG_LEN(sizeof(ttlval)); | |
785 | if (is_ipv6) { | |
786 | cmsg->cmsg_level = IPPROTO_IPV6; | |
787 | cmsg->cmsg_type = IPV6_HOPLIMIT; | |
788 | } else { | |
789 | #if BFD_LINUX | |
790 | cmsg->cmsg_level = IPPROTO_IP; | |
791 | cmsg->cmsg_type = IP_TTL; | |
792 | #else | |
793 | /* FreeBSD does not support TTL in ancillary data. */ | |
794 | msg.msg_control = NULL; | |
795 | msg.msg_controllen = 0; | |
796 | ||
797 | bp_set_ttl(sd, ttl); | |
798 | #endif /* BFD_BSD */ | |
799 | } | |
800 | memcpy(CMSG_DATA(cmsg), &ttlval, sizeof(ttlval)); | |
801 | } | |
802 | ||
803 | /* Send echo back. */ | |
804 | wlen = sendmsg(sd, &msg, 0); | |
805 | if (wlen <= 0) { | |
806 | log_debug("udp-send: loopback failure: (%d) %s", errno, strerror(errno)); | |
807 | return -1; | |
808 | } else if (wlen < (ssize_t)datalen) { | |
809 | log_debug("udp-send: partial send: %ld expected %ld", wlen, | |
810 | datalen); | |
811 | return -1; | |
812 | } | |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
e9e2c950 RZ |
817 | |
818 | /* | |
819 | * Sockets creation. | |
820 | */ | |
821 | ||
822 | ||
823 | /* | |
824 | * IPv4 sockets | |
825 | */ | |
6e01e275 | 826 | int bp_set_ttl(int sd, uint8_t value) |
e9e2c950 | 827 | { |
6e01e275 RZ |
828 | int ttl = value; |
829 | ||
830 | if (setsockopt(sd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) { | |
831 | log_warning("set-ttl: setsockopt(IP_TTL, %d): %s", value, | |
e9e2c950 RZ |
832 | strerror(errno)); |
833 | return -1; | |
834 | } | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
6e01e275 | 839 | int bp_set_tos(int sd, uint8_t value) |
e9e2c950 | 840 | { |
6e01e275 RZ |
841 | int tos = value; |
842 | ||
843 | if (setsockopt(sd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) { | |
844 | log_warning("set-tos: setsockopt(IP_TOS, %d): %s", value, | |
e9e2c950 RZ |
845 | strerror(errno)); |
846 | return -1; | |
847 | } | |
848 | ||
849 | return 0; | |
850 | } | |
851 | ||
852 | static void bp_set_ipopts(int sd) | |
853 | { | |
6e01e275 RZ |
854 | int rcvttl = BFD_RCV_TTL_VAL; |
855 | ||
856 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) | |
857 | log_fatal("set-ipopts: TTL configuration failed"); | |
e9e2c950 RZ |
858 | |
859 | if (setsockopt(sd, IPPROTO_IP, IP_RECVTTL, &rcvttl, sizeof(rcvttl)) | |
860 | == -1) | |
6e01e275 | 861 | log_fatal("set-ipopts: setsockopt(IP_RECVTTL, %d): %s", rcvttl, |
e9e2c950 RZ |
862 | strerror(errno)); |
863 | ||
864 | #ifdef BFD_LINUX | |
865 | int pktinfo = BFD_PKT_INFO_VAL; | |
6e01e275 | 866 | |
e9e2c950 RZ |
867 | /* Figure out address and interface to do the peer matching. */ |
868 | if (setsockopt(sd, IPPROTO_IP, IP_PKTINFO, &pktinfo, sizeof(pktinfo)) | |
869 | == -1) | |
6e01e275 | 870 | log_fatal("set-ipopts: setsockopt(IP_PKTINFO, %d): %s", pktinfo, |
e9e2c950 RZ |
871 | strerror(errno)); |
872 | #endif /* BFD_LINUX */ | |
873 | #ifdef BFD_BSD | |
874 | int yes = 1; | |
875 | ||
876 | /* Find out our address for peer matching. */ | |
877 | if (setsockopt(sd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) == -1) | |
6e01e275 | 878 | log_fatal("set-ipopts: setsockopt(IP_RECVDSTADDR, %d): %s", yes, |
e9e2c950 RZ |
879 | strerror(errno)); |
880 | ||
881 | /* Find out interface where the packet came in. */ | |
882 | if (setsockopt_ifindex(AF_INET, sd, yes) == -1) | |
6e01e275 | 883 | log_fatal("set-ipopts: setsockopt_ipv4_ifindex(%d): %s", yes, |
e9e2c950 RZ |
884 | strerror(errno)); |
885 | #endif /* BFD_BSD */ | |
886 | } | |
887 | ||
888 | static void bp_bind_ip(int sd, uint16_t port) | |
889 | { | |
890 | struct sockaddr_in sin; | |
891 | ||
892 | memset(&sin, 0, sizeof(sin)); | |
893 | sin.sin_family = AF_INET; | |
894 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
895 | sin.sin_port = htons(port); | |
896 | if (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1) | |
6e01e275 | 897 | log_fatal("bind-ip: bind: %s", strerror(errno)); |
e9e2c950 RZ |
898 | } |
899 | ||
900 | int bp_udp_shop(void) | |
901 | { | |
902 | int sd; | |
903 | ||
904 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
905 | if (sd == -1) | |
6e01e275 | 906 | log_fatal("udp-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
907 | |
908 | bp_set_ipopts(sd); | |
909 | bp_bind_ip(sd, BFD_DEFDESTPORT); | |
910 | ||
911 | return sd; | |
912 | } | |
913 | ||
914 | int bp_udp_mhop(void) | |
915 | { | |
916 | int sd; | |
917 | ||
918 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
919 | if (sd == -1) | |
6e01e275 | 920 | log_fatal("udp-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
921 | |
922 | bp_set_ipopts(sd); | |
923 | bp_bind_ip(sd, BFD_DEF_MHOP_DEST_PORT); | |
924 | ||
925 | return sd; | |
926 | } | |
927 | ||
928 | int bp_peer_socket(struct bfd_peer_cfg *bpc) | |
929 | { | |
930 | int sd, pcount; | |
931 | struct sockaddr_in sin; | |
932 | static int srcPort = BFD_SRCPORTINIT; | |
933 | ||
934 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
935 | if (sd == -1) { |
936 | log_error("ipv4-new: failed to create socket: %s", | |
937 | strerror(errno)); | |
e9e2c950 | 938 | return -1; |
03e7f088 | 939 | } |
e9e2c950 | 940 | |
8a9f760e RZ |
941 | /* Set TTL to 255 for all transmitted packets */ |
942 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) { | |
943 | close(sd); | |
944 | return -1; | |
e9e2c950 RZ |
945 | } |
946 | ||
947 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 948 | if (bp_set_tos(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
949 | close(sd); |
950 | return -1; | |
951 | } | |
952 | ||
8a9f760e | 953 | if (bpc->bpc_has_localif) { |
e9e2c950 RZ |
954 | if (bp_bind_dev(sd, bpc->bpc_localif) != 0) { |
955 | close(sd); | |
956 | return -1; | |
957 | } | |
958 | } else if (bpc->bpc_mhop && bpc->bpc_has_vrfname) { | |
959 | if (bp_bind_dev(sd, bpc->bpc_vrfname) != 0) { | |
960 | close(sd); | |
961 | return -1; | |
962 | } | |
963 | } | |
964 | ||
965 | /* Find an available source port in the proper range */ | |
966 | memset(&sin, 0, sizeof(sin)); | |
967 | sin = bpc->bpc_local.sa_sin; | |
968 | sin.sin_family = AF_INET; | |
969 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
970 | sin.sin_len = sizeof(sin); | |
971 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
8a9f760e | 972 | if (bpc->bpc_mhop) |
e9e2c950 RZ |
973 | sin.sin_addr = bpc->bpc_local.sa_sin.sin_addr; |
974 | else | |
975 | sin.sin_addr.s_addr = INADDR_ANY; | |
976 | ||
977 | pcount = 0; | |
978 | do { | |
979 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
980 | /* Searched all ports, none available */ | |
03e7f088 RZ |
981 | log_error("ipv4-new: failed to bind port: %s", |
982 | strerror(errno)); | |
e9e2c950 RZ |
983 | close(sd); |
984 | return -1; | |
985 | } | |
986 | if (srcPort >= BFD_SRCPORTMAX) | |
987 | srcPort = BFD_SRCPORTINIT; | |
988 | sin.sin_port = htons(srcPort++); | |
989 | } while (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) < 0); | |
990 | ||
991 | return sd; | |
992 | } | |
993 | ||
994 | ||
995 | /* | |
996 | * IPv6 sockets | |
997 | */ | |
998 | ||
999 | int bp_peer_socketv6(struct bfd_peer_cfg *bpc) | |
1000 | { | |
80edb675 RZ |
1001 | struct interface *ifp; |
1002 | int sd, pcount; | |
e9e2c950 RZ |
1003 | struct sockaddr_in6 sin6; |
1004 | static int srcPort = BFD_SRCPORTINIT; | |
1005 | ||
1006 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
1007 | if (sd == -1) { |
1008 | log_error("ipv6-new: failed to create socket: %s", | |
1009 | strerror(errno)); | |
e9e2c950 | 1010 | return -1; |
03e7f088 | 1011 | } |
e9e2c950 | 1012 | |
8a9f760e RZ |
1013 | /* Set TTL to 255 for all transmitted packets */ |
1014 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) != 0) { | |
1015 | close(sd); | |
1016 | return -1; | |
e9e2c950 RZ |
1017 | } |
1018 | ||
1019 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 1020 | if (bp_set_tosv6(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
1021 | close(sd); |
1022 | return -1; | |
1023 | } | |
1024 | ||
1025 | /* Find an available source port in the proper range */ | |
1026 | memset(&sin6, 0, sizeof(sin6)); | |
1027 | sin6.sin6_family = AF_INET6; | |
1028 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1029 | sin6.sin6_len = sizeof(sin6); | |
1030 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1031 | sin6 = bpc->bpc_local.sa_sin6; | |
80edb675 RZ |
1032 | if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) { |
1033 | ifp = if_lookup_by_name(bpc->bpc_localif, VRF_DEFAULT); | |
1034 | sin6.sin6_scope_id = | |
1035 | (ifp != NULL) ? ifp->ifindex : IFINDEX_INTERNAL; | |
1036 | } | |
e9e2c950 RZ |
1037 | |
1038 | if (bpc->bpc_has_localif) { | |
1039 | if (bp_bind_dev(sd, bpc->bpc_localif) != 0) { | |
1040 | close(sd); | |
1041 | return -1; | |
1042 | } | |
1043 | } else if (bpc->bpc_mhop && bpc->bpc_has_vrfname) { | |
1044 | if (bp_bind_dev(sd, bpc->bpc_vrfname) != 0) { | |
1045 | close(sd); | |
1046 | return -1; | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | pcount = 0; | |
1051 | do { | |
1052 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
1053 | /* Searched all ports, none available */ | |
03e7f088 RZ |
1054 | log_error("ipv6-new: failed to bind port: %s", |
1055 | strerror(errno)); | |
e9e2c950 RZ |
1056 | close(sd); |
1057 | return -1; | |
1058 | } | |
1059 | if (srcPort >= BFD_SRCPORTMAX) | |
1060 | srcPort = BFD_SRCPORTINIT; | |
1061 | sin6.sin6_port = htons(srcPort++); | |
1062 | } while (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) < 0); | |
1063 | ||
1064 | return sd; | |
1065 | } | |
1066 | ||
6e01e275 | 1067 | int bp_set_ttlv6(int sd, uint8_t value) |
e9e2c950 | 1068 | { |
6e01e275 RZ |
1069 | int ttl = value; |
1070 | ||
1071 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) | |
e9e2c950 | 1072 | == -1) { |
6e01e275 RZ |
1073 | log_warning("set-ttlv6: setsockopt(IPV6_UNICAST_HOPS, %d): %s", |
1074 | value, strerror(errno)); | |
e9e2c950 RZ |
1075 | return -1; |
1076 | } | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
6e01e275 | 1081 | int bp_set_tosv6(int sd, uint8_t value) |
e9e2c950 | 1082 | { |
6e01e275 RZ |
1083 | int tos = value; |
1084 | ||
1085 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) | |
e9e2c950 | 1086 | == -1) { |
6e01e275 | 1087 | log_warning("set-tosv6: setsockopt(IPV6_TCLASS, %d): %s", value, |
e9e2c950 RZ |
1088 | strerror(errno)); |
1089 | return -1; | |
1090 | } | |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | static void bp_set_ipv6opts(int sd) | |
1096 | { | |
6e01e275 RZ |
1097 | int ipv6_pktinfo = BFD_IPV6_PKT_INFO_VAL; |
1098 | int ipv6_only = BFD_IPV6_ONLY_VAL; | |
e9e2c950 | 1099 | |
6e01e275 RZ |
1100 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) == -1) |
1101 | log_fatal("set-ipv6opts: setsockopt(IPV6_UNICAST_HOPS, %d): %s", | |
1102 | BFD_TTL_VAL, strerror(errno)); | |
e9e2c950 | 1103 | |
6e01e275 RZ |
1104 | if (setsockopt_ipv6_hoplimit(sd, BFD_RCV_TTL_VAL) == -1) |
1105 | log_fatal("set-ipv6opts: setsockopt(IPV6_HOPLIMIT, %d): %s", | |
1106 | BFD_RCV_TTL_VAL, strerror(errno)); | |
e9e2c950 RZ |
1107 | |
1108 | if (setsockopt_ipv6_pktinfo(sd, ipv6_pktinfo) == -1) | |
6e01e275 RZ |
1109 | log_fatal("set-ipv6opts: setsockopt(IPV6_PKTINFO, %d): %s", |
1110 | ipv6_pktinfo, strerror(errno)); | |
e9e2c950 RZ |
1111 | |
1112 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6_only, | |
1113 | sizeof(ipv6_only)) | |
1114 | == -1) | |
6e01e275 RZ |
1115 | log_fatal("set-ipv6opts: setsockopt(IPV6_V6ONLY, %d): %s", |
1116 | ipv6_only, strerror(errno)); | |
e9e2c950 RZ |
1117 | } |
1118 | ||
1119 | static void bp_bind_ipv6(int sd, uint16_t port) | |
1120 | { | |
1121 | struct sockaddr_in6 sin6; | |
1122 | ||
1123 | memset(&sin6, 0, sizeof(sin6)); | |
1124 | sin6.sin6_family = AF_INET6; | |
1125 | sin6.sin6_addr = in6addr_any; | |
1126 | sin6.sin6_port = htons(port); | |
1127 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1128 | sin6.sin6_len = sizeof(sin6); | |
1129 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1130 | if (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) == -1) | |
6e01e275 | 1131 | log_fatal("bind-ipv6: bind: %s", strerror(errno)); |
e9e2c950 RZ |
1132 | } |
1133 | ||
1134 | int bp_udp6_shop(void) | |
1135 | { | |
1136 | int sd; | |
1137 | ||
1138 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1139 | if (sd == -1) | |
6e01e275 | 1140 | log_fatal("udp6-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1141 | |
1142 | bp_set_ipv6opts(sd); | |
1143 | bp_bind_ipv6(sd, BFD_DEFDESTPORT); | |
1144 | ||
1145 | return sd; | |
1146 | } | |
1147 | ||
1148 | int bp_udp6_mhop(void) | |
1149 | { | |
1150 | int sd; | |
1151 | ||
1152 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1153 | if (sd == -1) | |
6e01e275 | 1154 | log_fatal("udp6-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1155 | |
1156 | bp_set_ipv6opts(sd); | |
1157 | bp_bind_ipv6(sd, BFD_DEF_MHOP_DEST_PORT); | |
1158 | ||
1159 | return sd; | |
1160 | } | |
2f11c53f RZ |
1161 | |
1162 | int bp_echo_socket(void) | |
1163 | { | |
1164 | int s; | |
1165 | ||
1166 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
1167 | if (s == -1) | |
1168 | log_fatal("echo-socket: socket: %s", strerror(errno)); | |
1169 | ||
1170 | bp_set_ipopts(s); | |
1171 | bp_bind_ip(s, BFD_DEF_ECHO_PORT); | |
1172 | ||
1173 | return s; | |
1174 | } | |
1175 | ||
1176 | int bp_echov6_socket(void) | |
1177 | { | |
1178 | int s; | |
1179 | ||
1180 | s = socket(AF_INET6, SOCK_DGRAM, 0); | |
1181 | if (s == -1) | |
1182 | log_fatal("echov6-socket: socket: %s", strerror(errno)); | |
1183 | ||
1184 | bp_set_ipv6opts(s); | |
1185 | bp_bind_ipv6(s, BFD_DEF_ECHO_PORT); | |
1186 | ||
1187 | return s; | |
1188 | } |