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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 | 49 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
b333abc2 | 50 | ifindex_t *ifindex, struct sockaddr_any *local, |
50571b2e RZ |
51 | struct sockaddr_any *peer); |
52 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, | |
b333abc2 | 53 | ifindex_t *ifindex, struct sockaddr_any *local, |
50571b2e | 54 | struct sockaddr_any *peer); |
2f11c53f RZ |
55 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, |
56 | struct sockaddr *to, socklen_t tolen); | |
57 | int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr); | |
e9e2c950 RZ |
58 | |
59 | /* socket related prototypes */ | |
60 | static void bp_set_ipopts(int sd); | |
61 | static void bp_bind_ip(int sd, uint16_t port); | |
62 | static void bp_set_ipv6opts(int sd); | |
63 | static void bp_bind_ipv6(int sd, uint16_t port); | |
64 | ||
65 | ||
66 | /* | |
67 | * Functions | |
68 | */ | |
2f11c53f RZ |
69 | int _ptm_bfd_send(struct bfd_session *bs, uint16_t *port, const void *data, |
70 | size_t datalen) | |
e9e2c950 RZ |
71 | { |
72 | struct sockaddr *sa; | |
73 | struct sockaddr_in sin; | |
74 | struct sockaddr_in6 sin6; | |
e9e2c950 RZ |
75 | socklen_t slen; |
76 | ssize_t rv; | |
77 | int sd = -1; | |
78 | ||
2f11c53f | 79 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6)) { |
e9e2c950 RZ |
80 | memset(&sin6, 0, sizeof(sin6)); |
81 | sin6.sin6_family = AF_INET6; | |
79b4a6fc RZ |
82 | memcpy(&sin6.sin6_addr, &bs->key.peer, sizeof(sin6.sin6_addr)); |
83 | if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) | |
84 | sin6.sin6_scope_id = bs->ifp->ifindex; | |
85 | ||
e9e2c950 RZ |
86 | sin6.sin6_port = |
87 | (port) ? *port | |
88 | : (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) | |
89 | ? htons(BFD_DEF_MHOP_DEST_PORT) | |
90 | : htons(BFD_DEFDESTPORT); | |
91 | ||
92 | sd = bs->sock; | |
93 | sa = (struct sockaddr *)&sin6; | |
94 | slen = sizeof(sin6); | |
95 | } else { | |
96 | memset(&sin, 0, sizeof(sin)); | |
97 | sin.sin_family = AF_INET; | |
79b4a6fc | 98 | memcpy(&sin.sin_addr, &bs->key.peer, sizeof(sin.sin_addr)); |
e9e2c950 RZ |
99 | sin.sin_port = |
100 | (port) ? *port | |
101 | : (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) | |
102 | ? htons(BFD_DEF_MHOP_DEST_PORT) | |
103 | : htons(BFD_DEFDESTPORT); | |
104 | ||
105 | sd = bs->sock; | |
106 | sa = (struct sockaddr *)&sin; | |
107 | slen = sizeof(sin); | |
108 | } | |
109 | ||
110 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
111 | sa->sa_len = slen; | |
112 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
113 | rv = sendto(sd, data, datalen, 0, sa, slen); | |
114 | if (rv <= 0) { | |
03e7f088 | 115 | log_debug("packet-send: send failure: %s", strerror(errno)); |
e9e2c950 RZ |
116 | return -1; |
117 | } | |
03e7f088 RZ |
118 | if (rv < (ssize_t)datalen) |
119 | log_debug("packet-send: send partial", strerror(errno)); | |
e9e2c950 RZ |
120 | |
121 | return 0; | |
122 | } | |
123 | ||
e9e2c950 RZ |
124 | void ptm_bfd_echo_snd(struct bfd_session *bfd) |
125 | { | |
79b4a6fc | 126 | struct sockaddr *sa; |
2f11c53f RZ |
127 | socklen_t salen; |
128 | int sd; | |
129 | struct bfd_echo_pkt bep; | |
130 | struct sockaddr_in sin; | |
131 | struct sockaddr_in6 sin6; | |
e9e2c950 | 132 | |
2f11c53f | 133 | if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) |
e9e2c950 | 134 | BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE); |
e9e2c950 | 135 | |
2f11c53f RZ |
136 | memset(&bep, 0, sizeof(bep)); |
137 | bep.ver = BFD_ECHO_VERSION; | |
138 | bep.len = BFD_ECHO_PKT_LEN; | |
139 | bep.my_discr = htonl(bfd->discrs.my_discr); | |
140 | ||
2f11c53f RZ |
141 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_IPV6)) { |
142 | sd = bglobal.bg_echov6; | |
79b4a6fc | 143 | memset(&sin6, 0, sizeof(sin6)); |
4cf4e832 | 144 | sin6.sin6_family = AF_INET6; |
79b4a6fc RZ |
145 | memcpy(&sin6.sin6_addr, &bfd->key.peer, sizeof(sin6.sin6_addr)); |
146 | if (bfd->ifp && IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) | |
147 | sin6.sin6_scope_id = bfd->ifp->ifindex; | |
148 | ||
2f11c53f RZ |
149 | sin6.sin6_port = htons(BFD_DEF_ECHO_PORT); |
150 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
151 | sin6.sin6_len = sizeof(sin6); | |
152 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
153 | ||
79b4a6fc | 154 | sa = (struct sockaddr *)&sin6; |
2f11c53f | 155 | salen = sizeof(sin6); |
e9e2c950 | 156 | } else { |
2f11c53f | 157 | sd = bglobal.bg_echo; |
79b4a6fc | 158 | memset(&sin6, 0, sizeof(sin6)); |
4cf4e832 | 159 | sin.sin_family = AF_INET; |
79b4a6fc | 160 | memcpy(&sin.sin_addr, &bfd->key.peer, sizeof(sin.sin_addr)); |
2f11c53f RZ |
161 | sin.sin_port = htons(BFD_DEF_ECHO_PORT); |
162 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
163 | sin.sin_len = sizeof(sin); | |
164 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 | 165 | |
79b4a6fc | 166 | sa = (struct sockaddr *)&sin; |
2f11c53f | 167 | salen = sizeof(sin); |
e9e2c950 | 168 | } |
79b4a6fc RZ |
169 | if (bp_udp_send(sd, BFD_TTL_VAL, (uint8_t *)&bep, sizeof(bep), sa, |
170 | salen) | |
2f11c53f RZ |
171 | == -1) |
172 | return; | |
e9e2c950 RZ |
173 | |
174 | bfd->stats.tx_echo_pkt++; | |
175 | } | |
176 | ||
e9e2c950 RZ |
177 | static int ptm_bfd_process_echo_pkt(int s) |
178 | { | |
e9e2c950 | 179 | struct bfd_session *bfd; |
2f11c53f RZ |
180 | uint32_t my_discr = 0; |
181 | uint8_t ttl = 0; | |
e9e2c950 | 182 | |
2f11c53f RZ |
183 | /* Receive and parse echo packet. */ |
184 | if (bp_bfd_echo_in(s, &ttl, &my_discr) == -1) | |
185 | return 0; | |
e9e2c950 RZ |
186 | |
187 | /* Your discriminator not zero - use it to find session */ | |
188 | bfd = bfd_id_lookup(my_discr); | |
189 | if (bfd == NULL) { | |
03e7f088 | 190 | log_debug("echo-packet: no matching session (id:%u)", my_discr); |
e9e2c950 RZ |
191 | return -1; |
192 | } | |
193 | ||
194 | if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) { | |
9835f17d RZ |
195 | log_debug("echo-packet: echo disabled [%s] (id:%u)", |
196 | bs_to_string(bfd), my_discr); | |
e9e2c950 RZ |
197 | return -1; |
198 | } | |
199 | ||
200 | bfd->stats.rx_echo_pkt++; | |
201 | ||
202 | /* Compute detect time */ | |
203 | bfd->echo_detect_TO = bfd->remote_detect_mult * bfd->echo_xmt_TO; | |
204 | ||
205 | /* Update echo receive timeout. */ | |
451eb5a2 RZ |
206 | if (bfd->echo_detect_TO > 0) |
207 | bfd_echo_recvtimer_update(bfd); | |
e9e2c950 RZ |
208 | |
209 | return 0; | |
210 | } | |
211 | ||
212 | void ptm_bfd_snd(struct bfd_session *bfd, int fbit) | |
213 | { | |
214 | struct bfd_pkt cp; | |
215 | ||
e9e2c950 RZ |
216 | /* Set fields according to section 6.5.7 */ |
217 | cp.diag = bfd->local_diag; | |
218 | BFD_SETVER(cp.diag, BFD_VERSION); | |
219 | cp.flags = 0; | |
220 | BFD_SETSTATE(cp.flags, bfd->ses_state); | |
221 | BFD_SETDEMANDBIT(cp.flags, BFD_DEF_DEMAND); | |
0592db96 RZ |
222 | |
223 | /* | |
224 | * Polling and Final can't be set at the same time. | |
225 | * | |
226 | * RFC 5880, Section 6.5. | |
227 | */ | |
e9e2c950 | 228 | BFD_SETFBIT(cp.flags, fbit); |
0592db96 RZ |
229 | if (fbit == 0) |
230 | BFD_SETPBIT(cp.flags, bfd->polling); | |
231 | ||
e9e2c950 RZ |
232 | cp.detect_mult = bfd->detect_mult; |
233 | cp.len = BFD_PKT_LEN; | |
234 | cp.discrs.my_discr = htonl(bfd->discrs.my_discr); | |
235 | cp.discrs.remote_discr = htonl(bfd->discrs.remote_discr); | |
236 | if (bfd->polling) { | |
237 | cp.timers.desired_min_tx = | |
f43b9368 | 238 | htonl(bfd->timers.desired_min_tx); |
e9e2c950 | 239 | cp.timers.required_min_rx = |
f43b9368 | 240 | htonl(bfd->timers.required_min_rx); |
e9e2c950 | 241 | } else { |
f43b9368 RZ |
242 | /* |
243 | * We can only announce current setting on poll, this | |
244 | * avoids timing mismatch with our peer and give it | |
245 | * the oportunity to learn. See `bs_final_handler` for | |
246 | * more information. | |
247 | */ | |
248 | cp.timers.desired_min_tx = | |
249 | htonl(bfd->cur_timers.desired_min_tx); | |
250 | cp.timers.required_min_rx = | |
251 | htonl(bfd->cur_timers.required_min_rx); | |
e9e2c950 RZ |
252 | } |
253 | cp.timers.required_min_echo = htonl(bfd->timers.required_min_echo); | |
254 | ||
2f11c53f | 255 | if (_ptm_bfd_send(bfd, NULL, &cp, BFD_PKT_LEN) != 0) |
e9e2c950 | 256 | return; |
e9e2c950 RZ |
257 | |
258 | bfd->stats.tx_ctrl_pkt++; | |
259 | } | |
260 | ||
50571b2e | 261 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
b333abc2 | 262 | ifindex_t *ifindex, struct sockaddr_any *local, |
50571b2e | 263 | struct sockaddr_any *peer) |
e9e2c950 RZ |
264 | { |
265 | struct cmsghdr *cm; | |
e9e2c950 | 266 | ssize_t mlen; |
16084964 RZ |
267 | struct sockaddr_in msgaddr; |
268 | struct msghdr msghdr; | |
269 | struct iovec iov[1]; | |
270 | uint8_t cmsgbuf[255]; | |
271 | ||
272 | /* Prepare the recvmsg params. */ | |
273 | iov[0].iov_base = msgbuf; | |
50571b2e | 274 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
275 | |
276 | memset(&msghdr, 0, sizeof(msghdr)); | |
277 | msghdr.msg_name = &msgaddr; | |
278 | msghdr.msg_namelen = sizeof(msgaddr); | |
279 | msghdr.msg_iov = iov; | |
280 | msghdr.msg_iovlen = 1; | |
281 | msghdr.msg_control = cmsgbuf; | |
282 | msghdr.msg_controllen = sizeof(cmsgbuf); | |
283 | ||
e9e2c950 RZ |
284 | mlen = recvmsg(sd, &msghdr, MSG_DONTWAIT); |
285 | if (mlen == -1) { | |
03e7f088 RZ |
286 | if (errno != EAGAIN) |
287 | log_error("ipv4-recv: recv failed: %s", | |
288 | strerror(errno)); | |
289 | ||
e9e2c950 RZ |
290 | return -1; |
291 | } | |
292 | ||
293 | /* Get source address */ | |
294 | peer->sa_sin = *((struct sockaddr_in *)(msghdr.msg_name)); | |
295 | ||
296 | /* Get and check TTL */ | |
297 | for (cm = CMSG_FIRSTHDR(&msghdr); cm != NULL; | |
298 | cm = CMSG_NXTHDR(&msghdr, cm)) { | |
299 | if (cm->cmsg_level != IPPROTO_IP) | |
300 | continue; | |
301 | ||
302 | switch (cm->cmsg_type) { | |
303 | #ifdef BFD_LINUX | |
304 | case IP_TTL: { | |
50571b2e RZ |
305 | uint32_t ttlval; |
306 | ||
307 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); | |
308 | if (ttlval > 255) { | |
309 | log_debug("ipv4-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
310 | return -1; |
311 | } | |
50571b2e | 312 | *ttl = ttlval; |
e9e2c950 RZ |
313 | break; |
314 | } | |
315 | ||
316 | case IP_PKTINFO: { | |
317 | struct in_pktinfo *pi = | |
318 | (struct in_pktinfo *)CMSG_DATA(cm); | |
319 | ||
320 | if (pi == NULL) | |
321 | break; | |
322 | ||
323 | local->sa_sin.sin_family = AF_INET; | |
324 | local->sa_sin.sin_addr = pi->ipi_addr; | |
f43a14d2 RZ |
325 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
326 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
327 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
80edb675 | 328 | |
b333abc2 | 329 | *ifindex = pi->ipi_ifindex; |
e9e2c950 RZ |
330 | break; |
331 | } | |
332 | #endif /* BFD_LINUX */ | |
333 | #ifdef BFD_BSD | |
334 | case IP_RECVTTL: { | |
50571b2e | 335 | memcpy(ttl, CMSG_DATA(cm), sizeof(*ttl)); |
e9e2c950 RZ |
336 | break; |
337 | } | |
338 | ||
339 | case IP_RECVDSTADDR: { | |
340 | struct in_addr ia; | |
341 | ||
342 | memcpy(&ia, CMSG_DATA(cm), sizeof(ia)); | |
343 | local->sa_sin.sin_family = AF_INET; | |
344 | local->sa_sin.sin_addr = ia; | |
f43a14d2 RZ |
345 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
346 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
347 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 RZ |
348 | break; |
349 | } | |
350 | #endif /* BFD_BSD */ | |
351 | ||
352 | default: | |
353 | /* | |
354 | * On *BSDs we expect to land here when skipping | |
355 | * the IP_RECVIF header. It will be handled by | |
356 | * getsockopt_ifindex() below. | |
357 | */ | |
358 | /* NOTHING */ | |
359 | break; | |
360 | } | |
361 | } | |
362 | ||
363 | /* OS agnostic way of getting interface name. */ | |
b333abc2 RZ |
364 | if (*ifindex == IFINDEX_INTERNAL) |
365 | *ifindex = getsockopt_ifindex(AF_INET, &msghdr); | |
e9e2c950 RZ |
366 | |
367 | return mlen; | |
368 | } | |
369 | ||
50571b2e | 370 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
b333abc2 | 371 | ifindex_t *ifindex, struct sockaddr_any *local, |
50571b2e | 372 | struct sockaddr_any *peer) |
e9e2c950 RZ |
373 | { |
374 | struct cmsghdr *cm; | |
375 | struct in6_pktinfo *pi6 = NULL; | |
376 | ssize_t mlen; | |
6e01e275 | 377 | uint32_t ttlval; |
16084964 RZ |
378 | struct sockaddr_in6 msgaddr6; |
379 | struct msghdr msghdr6; | |
380 | struct iovec iov[1]; | |
381 | uint8_t cmsgbuf6[255]; | |
382 | ||
383 | /* Prepare the recvmsg params. */ | |
384 | iov[0].iov_base = msgbuf; | |
50571b2e | 385 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
386 | |
387 | memset(&msghdr6, 0, sizeof(msghdr6)); | |
388 | msghdr6.msg_name = &msgaddr6; | |
389 | msghdr6.msg_namelen = sizeof(msgaddr6); | |
390 | msghdr6.msg_iov = iov; | |
391 | msghdr6.msg_iovlen = 1; | |
392 | msghdr6.msg_control = cmsgbuf6; | |
393 | msghdr6.msg_controllen = sizeof(cmsgbuf6); | |
394 | ||
e9e2c950 RZ |
395 | mlen = recvmsg(sd, &msghdr6, MSG_DONTWAIT); |
396 | if (mlen == -1) { | |
03e7f088 | 397 | if (errno != EAGAIN) |
6e01e275 | 398 | log_error("ipv6-recv: recv failed: %s", |
03e7f088 RZ |
399 | strerror(errno)); |
400 | ||
e9e2c950 RZ |
401 | return -1; |
402 | } | |
403 | ||
404 | /* Get source address */ | |
405 | peer->sa_sin6 = *((struct sockaddr_in6 *)(msghdr6.msg_name)); | |
406 | ||
407 | /* Get and check TTL */ | |
408 | for (cm = CMSG_FIRSTHDR(&msghdr6); cm != NULL; | |
409 | cm = CMSG_NXTHDR(&msghdr6, cm)) { | |
410 | if (cm->cmsg_level != IPPROTO_IPV6) | |
411 | continue; | |
412 | ||
413 | if (cm->cmsg_type == IPV6_HOPLIMIT) { | |
6e01e275 | 414 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); |
50571b2e RZ |
415 | if (ttlval > 255) { |
416 | log_debug("ipv6-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
417 | return -1; |
418 | } | |
50571b2e RZ |
419 | |
420 | *ttl = ttlval; | |
e9e2c950 RZ |
421 | } else if (cm->cmsg_type == IPV6_PKTINFO) { |
422 | pi6 = (struct in6_pktinfo *)CMSG_DATA(cm); | |
423 | if (pi6) { | |
f43a14d2 | 424 | local->sa_sin6.sin6_family = AF_INET6; |
e9e2c950 | 425 | local->sa_sin6.sin6_addr = pi6->ipi6_addr; |
f43a14d2 RZ |
426 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
427 | local->sa_sin6.sin6_len = sizeof(local->sa_sin6); | |
428 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
80edb675 | 429 | |
b333abc2 | 430 | *ifindex = pi6->ipi6_ifindex; |
e9e2c950 RZ |
431 | } |
432 | } | |
433 | } | |
434 | ||
43adc702 RZ |
435 | /* Set scope ID for link local addresses. */ |
436 | if (IN6_IS_ADDR_LINKLOCAL(&peer->sa_sin6.sin6_addr)) | |
b333abc2 | 437 | peer->sa_sin6.sin6_scope_id = *ifindex; |
43adc702 | 438 | if (IN6_IS_ADDR_LINKLOCAL(&local->sa_sin6.sin6_addr)) |
b333abc2 | 439 | local->sa_sin6.sin6_scope_id = *ifindex; |
43adc702 | 440 | |
e9e2c950 RZ |
441 | return mlen; |
442 | } | |
443 | ||
444 | static void bfd_sd_reschedule(int sd) | |
445 | { | |
446 | if (sd == bglobal.bg_shop) { | |
8529e180 | 447 | THREAD_OFF(bglobal.bg_ev[0]); |
e9e2c950 RZ |
448 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop, |
449 | &bglobal.bg_ev[0]); | |
450 | } else if (sd == bglobal.bg_mhop) { | |
8529e180 | 451 | THREAD_OFF(bglobal.bg_ev[1]); |
e9e2c950 RZ |
452 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop, |
453 | &bglobal.bg_ev[1]); | |
454 | } else if (sd == bglobal.bg_shop6) { | |
8529e180 | 455 | THREAD_OFF(bglobal.bg_ev[2]); |
e9e2c950 RZ |
456 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop6, |
457 | &bglobal.bg_ev[2]); | |
458 | } else if (sd == bglobal.bg_mhop6) { | |
8529e180 | 459 | THREAD_OFF(bglobal.bg_ev[3]); |
e9e2c950 RZ |
460 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop6, |
461 | &bglobal.bg_ev[3]); | |
462 | } else if (sd == bglobal.bg_echo) { | |
8529e180 | 463 | THREAD_OFF(bglobal.bg_ev[4]); |
e9e2c950 RZ |
464 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echo, |
465 | &bglobal.bg_ev[4]); | |
2f11c53f | 466 | } else if (sd == bglobal.bg_echov6) { |
8529e180 | 467 | THREAD_OFF(bglobal.bg_ev[5]); |
2f11c53f RZ |
468 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echov6, |
469 | &bglobal.bg_ev[5]); | |
e9e2c950 RZ |
470 | } |
471 | } | |
472 | ||
03e7f088 | 473 | static void cp_debug(bool mhop, struct sockaddr_any *peer, |
b333abc2 RZ |
474 | struct sockaddr_any *local, ifindex_t ifindex, |
475 | vrf_id_t vrfid, const char *fmt, ...) | |
03e7f088 RZ |
476 | { |
477 | char buf[512], peerstr[128], localstr[128], portstr[64], vrfstr[64]; | |
478 | va_list vl; | |
479 | ||
480 | if (peer->sa_sin.sin_family) | |
481 | snprintf(peerstr, sizeof(peerstr), " peer:%s", satostr(peer)); | |
482 | else | |
483 | peerstr[0] = 0; | |
484 | ||
485 | if (local->sa_sin.sin_family) | |
486 | snprintf(localstr, sizeof(localstr), " local:%s", | |
487 | satostr(local)); | |
488 | else | |
489 | localstr[0] = 0; | |
490 | ||
b333abc2 RZ |
491 | if (ifindex != IFINDEX_INTERNAL) |
492 | snprintf(portstr, sizeof(portstr), " port:%u", ifindex); | |
03e7f088 RZ |
493 | else |
494 | portstr[0] = 0; | |
495 | ||
b333abc2 RZ |
496 | if (vrfid != VRF_DEFAULT) |
497 | snprintf(vrfstr, sizeof(vrfstr), " vrf:%u", vrfid); | |
03e7f088 RZ |
498 | else |
499 | vrfstr[0] = 0; | |
500 | ||
501 | va_start(vl, fmt); | |
502 | vsnprintf(buf, sizeof(buf), fmt, vl); | |
503 | va_end(vl); | |
504 | ||
505 | log_debug("control-packet: %s [mhop:%s%s%s%s%s]", buf, | |
506 | mhop ? "yes" : "no", peerstr, localstr, portstr, vrfstr); | |
507 | } | |
508 | ||
e9e2c950 RZ |
509 | int bfd_recv_cb(struct thread *t) |
510 | { | |
511 | int sd = THREAD_FD(t); | |
512 | struct bfd_session *bfd; | |
513 | struct bfd_pkt *cp; | |
8a9f760e | 514 | bool is_mhop; |
e9e2c950 | 515 | ssize_t mlen = 0; |
9f37770f | 516 | uint8_t ttl = 0; |
b333abc2 RZ |
517 | vrf_id_t vrfid = VRF_DEFAULT; |
518 | ifindex_t ifindex = IFINDEX_INTERNAL; | |
e9e2c950 | 519 | struct sockaddr_any local, peer; |
50571b2e | 520 | uint8_t msgbuf[1516]; |
e9e2c950 RZ |
521 | |
522 | /* Schedule next read. */ | |
523 | bfd_sd_reschedule(sd); | |
524 | ||
03e7f088 | 525 | /* Handle echo packets. */ |
2f11c53f | 526 | if (sd == bglobal.bg_echo || sd == bglobal.bg_echov6) { |
e9e2c950 RZ |
527 | ptm_bfd_process_echo_pkt(sd); |
528 | return 0; | |
529 | } | |
530 | ||
ff98a589 | 531 | /* Sanitize input/output. */ |
ff98a589 RZ |
532 | memset(&local, 0, sizeof(local)); |
533 | memset(&peer, 0, sizeof(peer)); | |
534 | ||
03e7f088 | 535 | /* Handle control packets. */ |
8a9f760e | 536 | is_mhop = false; |
e9e2c950 RZ |
537 | if (sd == bglobal.bg_shop || sd == bglobal.bg_mhop) { |
538 | is_mhop = sd == bglobal.bg_mhop; | |
b333abc2 | 539 | mlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), &ttl, &ifindex, |
50571b2e | 540 | &local, &peer); |
e9e2c950 RZ |
541 | } else if (sd == bglobal.bg_shop6 || sd == bglobal.bg_mhop6) { |
542 | is_mhop = sd == bglobal.bg_mhop6; | |
b333abc2 | 543 | mlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), &ttl, &ifindex, |
50571b2e | 544 | &local, &peer); |
e9e2c950 | 545 | } |
e9e2c950 RZ |
546 | |
547 | /* Implement RFC 5880 6.8.6 */ | |
548 | if (mlen < BFD_PKT_LEN) { | |
b333abc2 | 549 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 550 | "too small (%ld bytes)", mlen); |
e9e2c950 RZ |
551 | return 0; |
552 | } | |
553 | ||
50571b2e | 554 | /* Validate packet TTL. */ |
d8729f8c | 555 | if ((!is_mhop) && (ttl != BFD_TTL_VAL)) { |
b333abc2 | 556 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
50571b2e RZ |
557 | "invalid TTL: %d expected %d", ttl, BFD_TTL_VAL); |
558 | return 0; | |
559 | } | |
560 | ||
03e7f088 RZ |
561 | /* |
562 | * Parse the control header for inconsistencies: | |
563 | * - Invalid version; | |
564 | * - Bad multiplier configuration; | |
565 | * - Short packets; | |
566 | * - Invalid discriminator; | |
567 | */ | |
16084964 | 568 | cp = (struct bfd_pkt *)(msgbuf); |
e9e2c950 | 569 | if (BFD_GETVER(cp->diag) != BFD_VERSION) { |
b333abc2 | 570 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 571 | "bad version %d", BFD_GETVER(cp->diag)); |
e9e2c950 RZ |
572 | return 0; |
573 | } | |
574 | ||
575 | if (cp->detect_mult == 0) { | |
b333abc2 | 576 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 577 | "detect multiplier set to zero"); |
e9e2c950 RZ |
578 | return 0; |
579 | } | |
580 | ||
581 | if ((cp->len < BFD_PKT_LEN) || (cp->len > mlen)) { | |
b333abc2 | 582 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, "too small"); |
e9e2c950 RZ |
583 | return 0; |
584 | } | |
585 | ||
586 | if (cp->discrs.my_discr == 0) { | |
b333abc2 | 587 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 588 | "'my discriminator' is zero"); |
e9e2c950 RZ |
589 | return 0; |
590 | } | |
591 | ||
03e7f088 | 592 | /* Find the session that this packet belongs. */ |
b333abc2 | 593 | bfd = ptm_bfd_sess_find(cp, &peer, &local, ifindex, vrfid, is_mhop); |
e9e2c950 | 594 | if (bfd == NULL) { |
b333abc2 | 595 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 596 | "no session found"); |
e9e2c950 RZ |
597 | return 0; |
598 | } | |
599 | ||
e9e2c950 | 600 | bfd->stats.rx_ctrl_pkt++; |
03e7f088 RZ |
601 | |
602 | /* | |
603 | * Multi hop: validate packet TTL. | |
604 | * Single hop: set local address that received the packet. | |
605 | */ | |
e9e2c950 | 606 | if (is_mhop) { |
6e01e275 | 607 | if ((BFD_TTL_VAL - bfd->mh_ttl) > BFD_TTL_VAL) { |
b333abc2 | 608 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 609 | "exceeded max hop count (expected %d, got %d)", |
6e01e275 | 610 | bfd->mh_ttl, BFD_TTL_VAL); |
e9e2c950 RZ |
611 | return 0; |
612 | } | |
79b4a6fc RZ |
613 | } else if (bfd->local_address.sa_sin.sin_family == AF_UNSPEC) { |
614 | bfd->local_address = local; | |
e9e2c950 RZ |
615 | } |
616 | ||
617 | /* | |
618 | * If no interface was detected, save the interface where the | |
619 | * packet came in. | |
620 | */ | |
80edb675 | 621 | if (bfd->ifp == NULL) |
b333abc2 | 622 | bfd->ifp = if_lookup_by_index(ifindex, vrfid); |
e9e2c950 | 623 | |
03e7f088 | 624 | /* Log remote discriminator changes. */ |
e9e2c950 | 625 | if ((bfd->discrs.remote_discr != 0) |
03e7f088 | 626 | && (bfd->discrs.remote_discr != ntohl(cp->discrs.my_discr))) |
b333abc2 | 627 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
e945606e | 628 | "remote discriminator mismatch (expected %u, got %u)", |
03e7f088 | 629 | bfd->discrs.remote_discr, ntohl(cp->discrs.my_discr)); |
e9e2c950 RZ |
630 | |
631 | bfd->discrs.remote_discr = ntohl(cp->discrs.my_discr); | |
632 | ||
e9e2c950 RZ |
633 | /* Save remote diagnostics before state switch. */ |
634 | bfd->remote_diag = cp->diag & BFD_DIAGMASK; | |
635 | ||
c0ef9a8a RZ |
636 | /* Update remote timers settings. */ |
637 | bfd->remote_timers.desired_min_tx = ntohl(cp->timers.desired_min_tx); | |
638 | bfd->remote_timers.required_min_rx = ntohl(cp->timers.required_min_rx); | |
639 | bfd->remote_timers.required_min_echo = | |
640 | ntohl(cp->timers.required_min_echo); | |
641 | bfd->remote_detect_mult = cp->detect_mult; | |
642 | ||
aef131af RZ |
643 | /* State switch from section 6.2. */ |
644 | bs_state_handler(bfd, BFD_GETSTATE(cp->flags)); | |
e9e2c950 | 645 | |
c0ef9a8a RZ |
646 | /* RFC 5880, Section 6.5: handle POLL/FINAL negotiation sequence. */ |
647 | if (bfd->polling && BFD_GETFBIT(cp->flags)) { | |
648 | /* Disable pooling. */ | |
649 | bfd->polling = 0; | |
e9e2c950 | 650 | |
c0ef9a8a RZ |
651 | /* Handle poll finalization. */ |
652 | bs_final_handler(bfd); | |
653 | } else { | |
654 | /* Received a packet, lets update the receive timer. */ | |
655 | bfd_recvtimer_update(bfd); | |
e9e2c950 RZ |
656 | } |
657 | ||
c0ef9a8a RZ |
658 | /* Handle echo timers changes. */ |
659 | bs_echo_timer_handler(bfd); | |
e9e2c950 RZ |
660 | |
661 | /* | |
c0ef9a8a RZ |
662 | * We've received a packet with the POLL bit set, we must send |
663 | * a control packet back with the FINAL bit set. | |
664 | * | |
665 | * RFC 5880, Section 6.5. | |
e9e2c950 | 666 | */ |
0c1af3e4 RZ |
667 | if (BFD_GETPBIT(cp->flags)) { |
668 | /* We are finalizing a poll negotiation. */ | |
669 | bs_final_handler(bfd); | |
670 | ||
671 | /* Send the control packet with the final bit immediately. */ | |
c0ef9a8a | 672 | ptm_bfd_snd(bfd, 1); |
0c1af3e4 | 673 | } |
e9e2c950 RZ |
674 | |
675 | return 0; | |
676 | } | |
677 | ||
2f11c53f RZ |
678 | /* |
679 | * bp_bfd_echo_in: proccesses an BFD echo packet. On TTL == BFD_TTL_VAL | |
680 | * the packet is looped back or returns the my discriminator ID along | |
681 | * with the TTL. | |
682 | * | |
683 | * Returns -1 on error or loopback or 0 on success. | |
684 | */ | |
685 | int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr) | |
686 | { | |
687 | struct bfd_echo_pkt *bep; | |
688 | ssize_t rlen; | |
689 | struct sockaddr_any local, peer; | |
b333abc2 RZ |
690 | ifindex_t ifindex = IFINDEX_INTERNAL; |
691 | vrf_id_t vrfid = VRF_DEFAULT; | |
2f11c53f RZ |
692 | uint8_t msgbuf[1516]; |
693 | ||
694 | if (sd == bglobal.bg_echo) | |
b333abc2 | 695 | rlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), ttl, &ifindex, |
2f11c53f RZ |
696 | &local, &peer); |
697 | else | |
b333abc2 | 698 | rlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), ttl, &ifindex, |
2f11c53f RZ |
699 | &local, &peer); |
700 | ||
701 | /* Short packet, better not risk reading it. */ | |
702 | if (rlen < (ssize_t)sizeof(*bep)) { | |
b333abc2 | 703 | cp_debug(false, &peer, &local, ifindex, vrfid, |
2f11c53f RZ |
704 | "small echo packet"); |
705 | return -1; | |
706 | } | |
707 | ||
708 | /* Test for loopback. */ | |
709 | if (*ttl == BFD_TTL_VAL) { | |
710 | bp_udp_send(sd, *ttl - 1, msgbuf, rlen, | |
711 | (struct sockaddr *)&peer, | |
712 | (sd == bglobal.bg_echo) ? sizeof(peer.sa_sin) | |
713 | : sizeof(peer.sa_sin6)); | |
714 | return -1; | |
715 | } | |
716 | ||
717 | /* Read my discriminator from BFD Echo packet. */ | |
718 | bep = (struct bfd_echo_pkt *)msgbuf; | |
719 | *my_discr = ntohl(bep->my_discr); | |
720 | if (*my_discr == 0) { | |
b333abc2 | 721 | cp_debug(false, &peer, &local, ifindex, vrfid, |
2f11c53f RZ |
722 | "invalid echo packet discriminator (zero)"); |
723 | return -1; | |
724 | } | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, | |
730 | struct sockaddr *to, socklen_t tolen) | |
731 | { | |
732 | struct cmsghdr *cmsg; | |
733 | ssize_t wlen; | |
734 | int ttlval = ttl; | |
735 | bool is_ipv6 = to->sa_family == AF_INET6; | |
736 | struct msghdr msg; | |
737 | struct iovec iov[1]; | |
738 | uint8_t msgctl[255]; | |
739 | ||
740 | /* Prepare message data. */ | |
741 | iov[0].iov_base = data; | |
742 | iov[0].iov_len = datalen; | |
743 | ||
744 | memset(&msg, 0, sizeof(msg)); | |
745 | memset(msgctl, 0, sizeof(msgctl)); | |
746 | msg.msg_name = to; | |
747 | msg.msg_namelen = tolen; | |
748 | msg.msg_iov = iov; | |
749 | msg.msg_iovlen = 1; | |
750 | ||
751 | /* Prepare the packet TTL information. */ | |
752 | if (ttl > 0) { | |
753 | /* Use ancillary data. */ | |
754 | msg.msg_control = msgctl; | |
755 | msg.msg_controllen = CMSG_LEN(sizeof(ttlval)); | |
756 | ||
757 | /* Configure the ancillary data. */ | |
758 | cmsg = CMSG_FIRSTHDR(&msg); | |
759 | cmsg->cmsg_len = CMSG_LEN(sizeof(ttlval)); | |
760 | if (is_ipv6) { | |
761 | cmsg->cmsg_level = IPPROTO_IPV6; | |
762 | cmsg->cmsg_type = IPV6_HOPLIMIT; | |
763 | } else { | |
764 | #if BFD_LINUX | |
765 | cmsg->cmsg_level = IPPROTO_IP; | |
766 | cmsg->cmsg_type = IP_TTL; | |
767 | #else | |
768 | /* FreeBSD does not support TTL in ancillary data. */ | |
769 | msg.msg_control = NULL; | |
770 | msg.msg_controllen = 0; | |
771 | ||
772 | bp_set_ttl(sd, ttl); | |
773 | #endif /* BFD_BSD */ | |
774 | } | |
775 | memcpy(CMSG_DATA(cmsg), &ttlval, sizeof(ttlval)); | |
776 | } | |
777 | ||
778 | /* Send echo back. */ | |
779 | wlen = sendmsg(sd, &msg, 0); | |
780 | if (wlen <= 0) { | |
781 | log_debug("udp-send: loopback failure: (%d) %s", errno, strerror(errno)); | |
782 | return -1; | |
783 | } else if (wlen < (ssize_t)datalen) { | |
784 | log_debug("udp-send: partial send: %ld expected %ld", wlen, | |
785 | datalen); | |
786 | return -1; | |
787 | } | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
e9e2c950 RZ |
792 | |
793 | /* | |
794 | * Sockets creation. | |
795 | */ | |
796 | ||
797 | ||
798 | /* | |
799 | * IPv4 sockets | |
800 | */ | |
6e01e275 | 801 | int bp_set_ttl(int sd, uint8_t value) |
e9e2c950 | 802 | { |
6e01e275 RZ |
803 | int ttl = value; |
804 | ||
805 | if (setsockopt(sd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) { | |
806 | log_warning("set-ttl: setsockopt(IP_TTL, %d): %s", value, | |
e9e2c950 RZ |
807 | strerror(errno)); |
808 | return -1; | |
809 | } | |
810 | ||
811 | return 0; | |
812 | } | |
813 | ||
6e01e275 | 814 | int bp_set_tos(int sd, uint8_t value) |
e9e2c950 | 815 | { |
6e01e275 RZ |
816 | int tos = value; |
817 | ||
818 | if (setsockopt(sd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) { | |
819 | log_warning("set-tos: setsockopt(IP_TOS, %d): %s", value, | |
e9e2c950 RZ |
820 | strerror(errno)); |
821 | return -1; | |
822 | } | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | static void bp_set_ipopts(int sd) | |
828 | { | |
6e01e275 RZ |
829 | int rcvttl = BFD_RCV_TTL_VAL; |
830 | ||
831 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) | |
832 | log_fatal("set-ipopts: TTL configuration failed"); | |
e9e2c950 RZ |
833 | |
834 | if (setsockopt(sd, IPPROTO_IP, IP_RECVTTL, &rcvttl, sizeof(rcvttl)) | |
835 | == -1) | |
6e01e275 | 836 | log_fatal("set-ipopts: setsockopt(IP_RECVTTL, %d): %s", rcvttl, |
e9e2c950 RZ |
837 | strerror(errno)); |
838 | ||
839 | #ifdef BFD_LINUX | |
840 | int pktinfo = BFD_PKT_INFO_VAL; | |
6e01e275 | 841 | |
e9e2c950 RZ |
842 | /* Figure out address and interface to do the peer matching. */ |
843 | if (setsockopt(sd, IPPROTO_IP, IP_PKTINFO, &pktinfo, sizeof(pktinfo)) | |
844 | == -1) | |
6e01e275 | 845 | log_fatal("set-ipopts: setsockopt(IP_PKTINFO, %d): %s", pktinfo, |
e9e2c950 RZ |
846 | strerror(errno)); |
847 | #endif /* BFD_LINUX */ | |
848 | #ifdef BFD_BSD | |
849 | int yes = 1; | |
850 | ||
851 | /* Find out our address for peer matching. */ | |
852 | if (setsockopt(sd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) == -1) | |
6e01e275 | 853 | log_fatal("set-ipopts: setsockopt(IP_RECVDSTADDR, %d): %s", yes, |
e9e2c950 RZ |
854 | strerror(errno)); |
855 | ||
856 | /* Find out interface where the packet came in. */ | |
857 | if (setsockopt_ifindex(AF_INET, sd, yes) == -1) | |
6e01e275 | 858 | log_fatal("set-ipopts: setsockopt_ipv4_ifindex(%d): %s", yes, |
e9e2c950 RZ |
859 | strerror(errno)); |
860 | #endif /* BFD_BSD */ | |
861 | } | |
862 | ||
863 | static void bp_bind_ip(int sd, uint16_t port) | |
864 | { | |
865 | struct sockaddr_in sin; | |
866 | ||
867 | memset(&sin, 0, sizeof(sin)); | |
868 | sin.sin_family = AF_INET; | |
869 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
870 | sin.sin_port = htons(port); | |
871 | if (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1) | |
6e01e275 | 872 | log_fatal("bind-ip: bind: %s", strerror(errno)); |
e9e2c950 RZ |
873 | } |
874 | ||
875 | int bp_udp_shop(void) | |
876 | { | |
877 | int sd; | |
878 | ||
879 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
880 | if (sd == -1) | |
6e01e275 | 881 | log_fatal("udp-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
882 | |
883 | bp_set_ipopts(sd); | |
884 | bp_bind_ip(sd, BFD_DEFDESTPORT); | |
885 | ||
886 | return sd; | |
887 | } | |
888 | ||
889 | int bp_udp_mhop(void) | |
890 | { | |
891 | int sd; | |
892 | ||
893 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
894 | if (sd == -1) | |
6e01e275 | 895 | log_fatal("udp-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
896 | |
897 | bp_set_ipopts(sd); | |
898 | bp_bind_ip(sd, BFD_DEF_MHOP_DEST_PORT); | |
899 | ||
900 | return sd; | |
901 | } | |
902 | ||
d245e522 | 903 | int bp_peer_socket(const struct bfd_session *bs) |
e9e2c950 RZ |
904 | { |
905 | int sd, pcount; | |
906 | struct sockaddr_in sin; | |
907 | static int srcPort = BFD_SRCPORTINIT; | |
908 | ||
909 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
910 | if (sd == -1) { |
911 | log_error("ipv4-new: failed to create socket: %s", | |
912 | strerror(errno)); | |
e9e2c950 | 913 | return -1; |
03e7f088 | 914 | } |
e9e2c950 | 915 | |
8a9f760e RZ |
916 | /* Set TTL to 255 for all transmitted packets */ |
917 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) { | |
918 | close(sd); | |
919 | return -1; | |
e9e2c950 RZ |
920 | } |
921 | ||
922 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 923 | if (bp_set_tos(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
924 | close(sd); |
925 | return -1; | |
926 | } | |
927 | ||
79b4a6fc RZ |
928 | if (bs->key.ifname[0]) { |
929 | if (bp_bind_dev(sd, bs->key.ifname) != 0) { | |
e9e2c950 RZ |
930 | close(sd); |
931 | return -1; | |
932 | } | |
79b4a6fc RZ |
933 | } else if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) |
934 | && bs->key.vrfname[0]) { | |
935 | if (bp_bind_dev(sd, bs->key.vrfname) != 0) { | |
e9e2c950 RZ |
936 | close(sd); |
937 | return -1; | |
938 | } | |
939 | } | |
940 | ||
941 | /* Find an available source port in the proper range */ | |
79b4a6fc | 942 | memset(&sin, 0, sizeof(sin)); |
e9e2c950 RZ |
943 | sin.sin_family = AF_INET; |
944 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
945 | sin.sin_len = sizeof(sin); | |
946 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
79b4a6fc | 947 | memcpy(&sin.sin_addr, &bs->key.local, sizeof(sin.sin_addr)); |
d245e522 | 948 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) == 0) |
e9e2c950 RZ |
949 | sin.sin_addr.s_addr = INADDR_ANY; |
950 | ||
951 | pcount = 0; | |
952 | do { | |
953 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
954 | /* Searched all ports, none available */ | |
03e7f088 RZ |
955 | log_error("ipv4-new: failed to bind port: %s", |
956 | strerror(errno)); | |
e9e2c950 RZ |
957 | close(sd); |
958 | return -1; | |
959 | } | |
960 | if (srcPort >= BFD_SRCPORTMAX) | |
961 | srcPort = BFD_SRCPORTINIT; | |
962 | sin.sin_port = htons(srcPort++); | |
963 | } while (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) < 0); | |
964 | ||
965 | return sd; | |
966 | } | |
967 | ||
968 | ||
969 | /* | |
970 | * IPv6 sockets | |
971 | */ | |
972 | ||
d245e522 | 973 | int bp_peer_socketv6(const struct bfd_session *bs) |
e9e2c950 | 974 | { |
80edb675 | 975 | int sd, pcount; |
e9e2c950 RZ |
976 | struct sockaddr_in6 sin6; |
977 | static int srcPort = BFD_SRCPORTINIT; | |
978 | ||
979 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
980 | if (sd == -1) { |
981 | log_error("ipv6-new: failed to create socket: %s", | |
982 | strerror(errno)); | |
e9e2c950 | 983 | return -1; |
03e7f088 | 984 | } |
e9e2c950 | 985 | |
8a9f760e RZ |
986 | /* Set TTL to 255 for all transmitted packets */ |
987 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) != 0) { | |
988 | close(sd); | |
989 | return -1; | |
e9e2c950 RZ |
990 | } |
991 | ||
992 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 993 | if (bp_set_tosv6(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
994 | close(sd); |
995 | return -1; | |
996 | } | |
997 | ||
998 | /* Find an available source port in the proper range */ | |
79b4a6fc | 999 | memset(&sin6, 0, sizeof(sin6)); |
e9e2c950 RZ |
1000 | sin6.sin6_family = AF_INET6; |
1001 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1002 | sin6.sin6_len = sizeof(sin6); | |
1003 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
79b4a6fc RZ |
1004 | memcpy(&sin6.sin6_addr, &bs->key.local, sizeof(sin6.sin6_addr)); |
1005 | if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) | |
1006 | sin6.sin6_scope_id = bs->ifp->ifindex; | |
e9e2c950 | 1007 | |
79b4a6fc RZ |
1008 | if (bs->key.ifname[0]) { |
1009 | if (bp_bind_dev(sd, bs->key.ifname) != 0) { | |
e9e2c950 RZ |
1010 | close(sd); |
1011 | return -1; | |
1012 | } | |
79b4a6fc RZ |
1013 | } else if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) |
1014 | && bs->key.vrfname[0]) { | |
1015 | if (bp_bind_dev(sd, bs->key.vrfname) != 0) { | |
e9e2c950 RZ |
1016 | close(sd); |
1017 | return -1; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | pcount = 0; | |
1022 | do { | |
1023 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
1024 | /* Searched all ports, none available */ | |
03e7f088 RZ |
1025 | log_error("ipv6-new: failed to bind port: %s", |
1026 | strerror(errno)); | |
e9e2c950 RZ |
1027 | close(sd); |
1028 | return -1; | |
1029 | } | |
1030 | if (srcPort >= BFD_SRCPORTMAX) | |
1031 | srcPort = BFD_SRCPORTINIT; | |
1032 | sin6.sin6_port = htons(srcPort++); | |
1033 | } while (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) < 0); | |
1034 | ||
1035 | return sd; | |
1036 | } | |
1037 | ||
6e01e275 | 1038 | int bp_set_ttlv6(int sd, uint8_t value) |
e9e2c950 | 1039 | { |
6e01e275 RZ |
1040 | int ttl = value; |
1041 | ||
1042 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) | |
e9e2c950 | 1043 | == -1) { |
6e01e275 RZ |
1044 | log_warning("set-ttlv6: setsockopt(IPV6_UNICAST_HOPS, %d): %s", |
1045 | value, strerror(errno)); | |
e9e2c950 RZ |
1046 | return -1; |
1047 | } | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
6e01e275 | 1052 | int bp_set_tosv6(int sd, uint8_t value) |
e9e2c950 | 1053 | { |
6e01e275 RZ |
1054 | int tos = value; |
1055 | ||
1056 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) | |
e9e2c950 | 1057 | == -1) { |
6e01e275 | 1058 | log_warning("set-tosv6: setsockopt(IPV6_TCLASS, %d): %s", value, |
e9e2c950 RZ |
1059 | strerror(errno)); |
1060 | return -1; | |
1061 | } | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static void bp_set_ipv6opts(int sd) | |
1067 | { | |
6e01e275 RZ |
1068 | int ipv6_pktinfo = BFD_IPV6_PKT_INFO_VAL; |
1069 | int ipv6_only = BFD_IPV6_ONLY_VAL; | |
e9e2c950 | 1070 | |
6e01e275 RZ |
1071 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) == -1) |
1072 | log_fatal("set-ipv6opts: setsockopt(IPV6_UNICAST_HOPS, %d): %s", | |
1073 | BFD_TTL_VAL, strerror(errno)); | |
e9e2c950 | 1074 | |
6e01e275 RZ |
1075 | if (setsockopt_ipv6_hoplimit(sd, BFD_RCV_TTL_VAL) == -1) |
1076 | log_fatal("set-ipv6opts: setsockopt(IPV6_HOPLIMIT, %d): %s", | |
1077 | BFD_RCV_TTL_VAL, strerror(errno)); | |
e9e2c950 RZ |
1078 | |
1079 | if (setsockopt_ipv6_pktinfo(sd, ipv6_pktinfo) == -1) | |
6e01e275 RZ |
1080 | log_fatal("set-ipv6opts: setsockopt(IPV6_PKTINFO, %d): %s", |
1081 | ipv6_pktinfo, strerror(errno)); | |
e9e2c950 RZ |
1082 | |
1083 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6_only, | |
1084 | sizeof(ipv6_only)) | |
1085 | == -1) | |
6e01e275 RZ |
1086 | log_fatal("set-ipv6opts: setsockopt(IPV6_V6ONLY, %d): %s", |
1087 | ipv6_only, strerror(errno)); | |
e9e2c950 RZ |
1088 | } |
1089 | ||
1090 | static void bp_bind_ipv6(int sd, uint16_t port) | |
1091 | { | |
1092 | struct sockaddr_in6 sin6; | |
1093 | ||
1094 | memset(&sin6, 0, sizeof(sin6)); | |
1095 | sin6.sin6_family = AF_INET6; | |
1096 | sin6.sin6_addr = in6addr_any; | |
1097 | sin6.sin6_port = htons(port); | |
1098 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1099 | sin6.sin6_len = sizeof(sin6); | |
1100 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1101 | if (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) == -1) | |
6e01e275 | 1102 | log_fatal("bind-ipv6: bind: %s", strerror(errno)); |
e9e2c950 RZ |
1103 | } |
1104 | ||
1105 | int bp_udp6_shop(void) | |
1106 | { | |
1107 | int sd; | |
1108 | ||
1109 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1110 | if (sd == -1) | |
6e01e275 | 1111 | log_fatal("udp6-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1112 | |
1113 | bp_set_ipv6opts(sd); | |
1114 | bp_bind_ipv6(sd, BFD_DEFDESTPORT); | |
1115 | ||
1116 | return sd; | |
1117 | } | |
1118 | ||
1119 | int bp_udp6_mhop(void) | |
1120 | { | |
1121 | int sd; | |
1122 | ||
1123 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1124 | if (sd == -1) | |
6e01e275 | 1125 | log_fatal("udp6-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1126 | |
1127 | bp_set_ipv6opts(sd); | |
1128 | bp_bind_ipv6(sd, BFD_DEF_MHOP_DEST_PORT); | |
1129 | ||
1130 | return sd; | |
1131 | } | |
2f11c53f RZ |
1132 | |
1133 | int bp_echo_socket(void) | |
1134 | { | |
1135 | int s; | |
1136 | ||
1137 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
1138 | if (s == -1) | |
1139 | log_fatal("echo-socket: socket: %s", strerror(errno)); | |
1140 | ||
1141 | bp_set_ipopts(s); | |
1142 | bp_bind_ip(s, BFD_DEF_ECHO_PORT); | |
1143 | ||
1144 | return s; | |
1145 | } | |
1146 | ||
1147 | int bp_echov6_socket(void) | |
1148 | { | |
1149 | int s; | |
1150 | ||
1151 | s = socket(AF_INET6, SOCK_DGRAM, 0); | |
1152 | if (s == -1) | |
1153 | log_fatal("echov6-socket: socket: %s", strerror(errno)); | |
1154 | ||
1155 | bp_set_ipv6opts(s); | |
1156 | bp_bind_ipv6(s, BFD_DEF_ECHO_PORT); | |
1157 | ||
1158 | return s; | |
1159 | } |