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