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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 | ||
e9e2c950 RZ |
40 | /* |
41 | * Prototypes | |
42 | */ | |
7bcadbae | 43 | static int ptm_bfd_process_echo_pkt(struct bfd_vrf_global *bvrf, int s); |
2f11c53f RZ |
44 | int _ptm_bfd_send(struct bfd_session *bs, uint16_t *port, const void *data, |
45 | size_t datalen); | |
e9e2c950 | 46 | |
7bcadbae | 47 | static void bfd_sd_reschedule(struct bfd_vrf_global *bvrf, int sd); |
50571b2e | 48 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
b333abc2 | 49 | ifindex_t *ifindex, struct sockaddr_any *local, |
50571b2e RZ |
50 | struct sockaddr_any *peer); |
51 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, | |
b333abc2 | 52 | ifindex_t *ifindex, struct sockaddr_any *local, |
50571b2e | 53 | struct sockaddr_any *peer); |
2f11c53f RZ |
54 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, |
55 | struct sockaddr *to, socklen_t tolen); | |
7bcadbae PG |
56 | int bp_bfd_echo_in(struct bfd_vrf_global *bvrf, int sd, |
57 | 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; | |
7bcadbae | 132 | struct bfd_vrf_global *bvrf = bfd_vrf_look_by_session(bfd); |
e9e2c950 | 133 | |
7bcadbae PG |
134 | if (!bvrf) |
135 | return; | |
2f11c53f | 136 | if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) |
e9e2c950 | 137 | BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE); |
e9e2c950 | 138 | |
2f11c53f RZ |
139 | memset(&bep, 0, sizeof(bep)); |
140 | bep.ver = BFD_ECHO_VERSION; | |
141 | bep.len = BFD_ECHO_PKT_LEN; | |
142 | bep.my_discr = htonl(bfd->discrs.my_discr); | |
143 | ||
2f11c53f | 144 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_IPV6)) { |
7bcadbae | 145 | sd = bvrf->bg_echov6; |
79b4a6fc | 146 | memset(&sin6, 0, sizeof(sin6)); |
4cf4e832 | 147 | sin6.sin6_family = AF_INET6; |
79b4a6fc RZ |
148 | memcpy(&sin6.sin6_addr, &bfd->key.peer, sizeof(sin6.sin6_addr)); |
149 | if (bfd->ifp && IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) | |
150 | sin6.sin6_scope_id = bfd->ifp->ifindex; | |
151 | ||
2f11c53f RZ |
152 | sin6.sin6_port = htons(BFD_DEF_ECHO_PORT); |
153 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
154 | sin6.sin6_len = sizeof(sin6); | |
155 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
156 | ||
79b4a6fc | 157 | sa = (struct sockaddr *)&sin6; |
2f11c53f | 158 | salen = sizeof(sin6); |
e9e2c950 | 159 | } else { |
7bcadbae | 160 | sd = bvrf->bg_echo; |
79b4a6fc | 161 | memset(&sin6, 0, sizeof(sin6)); |
4cf4e832 | 162 | sin.sin_family = AF_INET; |
79b4a6fc | 163 | memcpy(&sin.sin_addr, &bfd->key.peer, sizeof(sin.sin_addr)); |
2f11c53f RZ |
164 | sin.sin_port = htons(BFD_DEF_ECHO_PORT); |
165 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
166 | sin.sin_len = sizeof(sin); | |
167 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 | 168 | |
79b4a6fc | 169 | sa = (struct sockaddr *)&sin; |
2f11c53f | 170 | salen = sizeof(sin); |
e9e2c950 | 171 | } |
79b4a6fc RZ |
172 | if (bp_udp_send(sd, BFD_TTL_VAL, (uint8_t *)&bep, sizeof(bep), sa, |
173 | salen) | |
2f11c53f RZ |
174 | == -1) |
175 | return; | |
e9e2c950 RZ |
176 | |
177 | bfd->stats.tx_echo_pkt++; | |
178 | } | |
179 | ||
7bcadbae | 180 | static int ptm_bfd_process_echo_pkt(struct bfd_vrf_global *bvrf, int s) |
e9e2c950 | 181 | { |
e9e2c950 | 182 | struct bfd_session *bfd; |
2f11c53f RZ |
183 | uint32_t my_discr = 0; |
184 | uint8_t ttl = 0; | |
e9e2c950 | 185 | |
2f11c53f | 186 | /* Receive and parse echo packet. */ |
7bcadbae | 187 | if (bp_bfd_echo_in(bvrf, s, &ttl, &my_discr) == -1) |
2f11c53f | 188 | return 0; |
e9e2c950 RZ |
189 | |
190 | /* Your discriminator not zero - use it to find session */ | |
191 | bfd = bfd_id_lookup(my_discr); | |
192 | if (bfd == NULL) { | |
03e7f088 | 193 | log_debug("echo-packet: no matching session (id:%u)", my_discr); |
e9e2c950 RZ |
194 | return -1; |
195 | } | |
196 | ||
197 | if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) { | |
9835f17d RZ |
198 | log_debug("echo-packet: echo disabled [%s] (id:%u)", |
199 | bs_to_string(bfd), my_discr); | |
e9e2c950 RZ |
200 | return -1; |
201 | } | |
202 | ||
203 | bfd->stats.rx_echo_pkt++; | |
204 | ||
205 | /* Compute detect time */ | |
206 | bfd->echo_detect_TO = bfd->remote_detect_mult * bfd->echo_xmt_TO; | |
207 | ||
208 | /* Update echo receive timeout. */ | |
451eb5a2 RZ |
209 | if (bfd->echo_detect_TO > 0) |
210 | bfd_echo_recvtimer_update(bfd); | |
e9e2c950 RZ |
211 | |
212 | return 0; | |
213 | } | |
214 | ||
215 | void ptm_bfd_snd(struct bfd_session *bfd, int fbit) | |
216 | { | |
217 | struct bfd_pkt cp; | |
218 | ||
e9e2c950 RZ |
219 | /* Set fields according to section 6.5.7 */ |
220 | cp.diag = bfd->local_diag; | |
221 | BFD_SETVER(cp.diag, BFD_VERSION); | |
222 | cp.flags = 0; | |
223 | BFD_SETSTATE(cp.flags, bfd->ses_state); | |
9beff0bd PG |
224 | |
225 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_CBIT)) | |
226 | BFD_SETCBIT(cp.flags, BFD_CBIT); | |
227 | ||
e9e2c950 | 228 | BFD_SETDEMANDBIT(cp.flags, BFD_DEF_DEMAND); |
0592db96 RZ |
229 | |
230 | /* | |
231 | * Polling and Final can't be set at the same time. | |
232 | * | |
233 | * RFC 5880, Section 6.5. | |
234 | */ | |
e9e2c950 | 235 | BFD_SETFBIT(cp.flags, fbit); |
0592db96 RZ |
236 | if (fbit == 0) |
237 | BFD_SETPBIT(cp.flags, bfd->polling); | |
238 | ||
e9e2c950 RZ |
239 | cp.detect_mult = bfd->detect_mult; |
240 | cp.len = BFD_PKT_LEN; | |
241 | cp.discrs.my_discr = htonl(bfd->discrs.my_discr); | |
242 | cp.discrs.remote_discr = htonl(bfd->discrs.remote_discr); | |
243 | if (bfd->polling) { | |
244 | cp.timers.desired_min_tx = | |
f43b9368 | 245 | htonl(bfd->timers.desired_min_tx); |
e9e2c950 | 246 | cp.timers.required_min_rx = |
f43b9368 | 247 | htonl(bfd->timers.required_min_rx); |
e9e2c950 | 248 | } else { |
f43b9368 RZ |
249 | /* |
250 | * We can only announce current setting on poll, this | |
251 | * avoids timing mismatch with our peer and give it | |
252 | * the oportunity to learn. See `bs_final_handler` for | |
253 | * more information. | |
254 | */ | |
255 | cp.timers.desired_min_tx = | |
256 | htonl(bfd->cur_timers.desired_min_tx); | |
257 | cp.timers.required_min_rx = | |
258 | htonl(bfd->cur_timers.required_min_rx); | |
e9e2c950 RZ |
259 | } |
260 | cp.timers.required_min_echo = htonl(bfd->timers.required_min_echo); | |
261 | ||
2f11c53f | 262 | if (_ptm_bfd_send(bfd, NULL, &cp, BFD_PKT_LEN) != 0) |
e9e2c950 | 263 | return; |
e9e2c950 RZ |
264 | |
265 | bfd->stats.tx_ctrl_pkt++; | |
266 | } | |
267 | ||
50571b2e | 268 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
b333abc2 | 269 | ifindex_t *ifindex, struct sockaddr_any *local, |
50571b2e | 270 | struct sockaddr_any *peer) |
e9e2c950 RZ |
271 | { |
272 | struct cmsghdr *cm; | |
e9e2c950 | 273 | ssize_t mlen; |
16084964 RZ |
274 | struct sockaddr_in msgaddr; |
275 | struct msghdr msghdr; | |
276 | struct iovec iov[1]; | |
277 | uint8_t cmsgbuf[255]; | |
278 | ||
279 | /* Prepare the recvmsg params. */ | |
280 | iov[0].iov_base = msgbuf; | |
50571b2e | 281 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
282 | |
283 | memset(&msghdr, 0, sizeof(msghdr)); | |
284 | msghdr.msg_name = &msgaddr; | |
285 | msghdr.msg_namelen = sizeof(msgaddr); | |
286 | msghdr.msg_iov = iov; | |
287 | msghdr.msg_iovlen = 1; | |
288 | msghdr.msg_control = cmsgbuf; | |
289 | msghdr.msg_controllen = sizeof(cmsgbuf); | |
290 | ||
e9e2c950 RZ |
291 | mlen = recvmsg(sd, &msghdr, MSG_DONTWAIT); |
292 | if (mlen == -1) { | |
03e7f088 RZ |
293 | if (errno != EAGAIN) |
294 | log_error("ipv4-recv: recv failed: %s", | |
295 | strerror(errno)); | |
296 | ||
e9e2c950 RZ |
297 | return -1; |
298 | } | |
299 | ||
300 | /* Get source address */ | |
301 | peer->sa_sin = *((struct sockaddr_in *)(msghdr.msg_name)); | |
302 | ||
303 | /* Get and check TTL */ | |
304 | for (cm = CMSG_FIRSTHDR(&msghdr); cm != NULL; | |
305 | cm = CMSG_NXTHDR(&msghdr, cm)) { | |
306 | if (cm->cmsg_level != IPPROTO_IP) | |
307 | continue; | |
308 | ||
309 | switch (cm->cmsg_type) { | |
310 | #ifdef BFD_LINUX | |
311 | case IP_TTL: { | |
50571b2e RZ |
312 | uint32_t ttlval; |
313 | ||
314 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); | |
315 | if (ttlval > 255) { | |
316 | log_debug("ipv4-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
317 | return -1; |
318 | } | |
50571b2e | 319 | *ttl = ttlval; |
e9e2c950 RZ |
320 | break; |
321 | } | |
322 | ||
323 | case IP_PKTINFO: { | |
324 | struct in_pktinfo *pi = | |
325 | (struct in_pktinfo *)CMSG_DATA(cm); | |
326 | ||
327 | if (pi == NULL) | |
328 | break; | |
329 | ||
330 | local->sa_sin.sin_family = AF_INET; | |
331 | local->sa_sin.sin_addr = pi->ipi_addr; | |
f43a14d2 RZ |
332 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
333 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
334 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
80edb675 | 335 | |
b333abc2 | 336 | *ifindex = pi->ipi_ifindex; |
e9e2c950 RZ |
337 | break; |
338 | } | |
339 | #endif /* BFD_LINUX */ | |
340 | #ifdef BFD_BSD | |
341 | case IP_RECVTTL: { | |
50571b2e | 342 | memcpy(ttl, CMSG_DATA(cm), sizeof(*ttl)); |
e9e2c950 RZ |
343 | break; |
344 | } | |
345 | ||
346 | case IP_RECVDSTADDR: { | |
347 | struct in_addr ia; | |
348 | ||
349 | memcpy(&ia, CMSG_DATA(cm), sizeof(ia)); | |
350 | local->sa_sin.sin_family = AF_INET; | |
351 | local->sa_sin.sin_addr = ia; | |
f43a14d2 RZ |
352 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
353 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
354 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 RZ |
355 | break; |
356 | } | |
357 | #endif /* BFD_BSD */ | |
358 | ||
359 | default: | |
360 | /* | |
361 | * On *BSDs we expect to land here when skipping | |
362 | * the IP_RECVIF header. It will be handled by | |
363 | * getsockopt_ifindex() below. | |
364 | */ | |
365 | /* NOTHING */ | |
366 | break; | |
367 | } | |
368 | } | |
369 | ||
370 | /* OS agnostic way of getting interface name. */ | |
b333abc2 RZ |
371 | if (*ifindex == IFINDEX_INTERNAL) |
372 | *ifindex = getsockopt_ifindex(AF_INET, &msghdr); | |
e9e2c950 RZ |
373 | |
374 | return mlen; | |
375 | } | |
376 | ||
50571b2e | 377 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
b333abc2 | 378 | ifindex_t *ifindex, struct sockaddr_any *local, |
50571b2e | 379 | struct sockaddr_any *peer) |
e9e2c950 RZ |
380 | { |
381 | struct cmsghdr *cm; | |
382 | struct in6_pktinfo *pi6 = NULL; | |
383 | ssize_t mlen; | |
6e01e275 | 384 | uint32_t ttlval; |
16084964 RZ |
385 | struct sockaddr_in6 msgaddr6; |
386 | struct msghdr msghdr6; | |
387 | struct iovec iov[1]; | |
388 | uint8_t cmsgbuf6[255]; | |
389 | ||
390 | /* Prepare the recvmsg params. */ | |
391 | iov[0].iov_base = msgbuf; | |
50571b2e | 392 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
393 | |
394 | memset(&msghdr6, 0, sizeof(msghdr6)); | |
395 | msghdr6.msg_name = &msgaddr6; | |
396 | msghdr6.msg_namelen = sizeof(msgaddr6); | |
397 | msghdr6.msg_iov = iov; | |
398 | msghdr6.msg_iovlen = 1; | |
399 | msghdr6.msg_control = cmsgbuf6; | |
400 | msghdr6.msg_controllen = sizeof(cmsgbuf6); | |
401 | ||
e9e2c950 RZ |
402 | mlen = recvmsg(sd, &msghdr6, MSG_DONTWAIT); |
403 | if (mlen == -1) { | |
03e7f088 | 404 | if (errno != EAGAIN) |
6e01e275 | 405 | log_error("ipv6-recv: recv failed: %s", |
03e7f088 RZ |
406 | strerror(errno)); |
407 | ||
e9e2c950 RZ |
408 | return -1; |
409 | } | |
410 | ||
411 | /* Get source address */ | |
412 | peer->sa_sin6 = *((struct sockaddr_in6 *)(msghdr6.msg_name)); | |
413 | ||
414 | /* Get and check TTL */ | |
415 | for (cm = CMSG_FIRSTHDR(&msghdr6); cm != NULL; | |
416 | cm = CMSG_NXTHDR(&msghdr6, cm)) { | |
417 | if (cm->cmsg_level != IPPROTO_IPV6) | |
418 | continue; | |
419 | ||
420 | if (cm->cmsg_type == IPV6_HOPLIMIT) { | |
6e01e275 | 421 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); |
50571b2e RZ |
422 | if (ttlval > 255) { |
423 | log_debug("ipv6-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
424 | return -1; |
425 | } | |
50571b2e RZ |
426 | |
427 | *ttl = ttlval; | |
e9e2c950 RZ |
428 | } else if (cm->cmsg_type == IPV6_PKTINFO) { |
429 | pi6 = (struct in6_pktinfo *)CMSG_DATA(cm); | |
430 | if (pi6) { | |
f43a14d2 | 431 | local->sa_sin6.sin6_family = AF_INET6; |
e9e2c950 | 432 | local->sa_sin6.sin6_addr = pi6->ipi6_addr; |
f43a14d2 RZ |
433 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
434 | local->sa_sin6.sin6_len = sizeof(local->sa_sin6); | |
435 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
80edb675 | 436 | |
b333abc2 | 437 | *ifindex = pi6->ipi6_ifindex; |
fa3bf3a2 MS |
438 | |
439 | /* Set scope ID for link local addresses. */ | |
440 | if (IN6_IS_ADDR_LINKLOCAL( | |
441 | &peer->sa_sin6.sin6_addr)) | |
442 | peer->sa_sin6.sin6_scope_id = *ifindex; | |
443 | if (IN6_IS_ADDR_LINKLOCAL( | |
444 | &local->sa_sin6.sin6_addr)) | |
445 | local->sa_sin6.sin6_scope_id = *ifindex; | |
e9e2c950 RZ |
446 | } |
447 | } | |
448 | } | |
449 | ||
450 | return mlen; | |
451 | } | |
452 | ||
7bcadbae | 453 | static void bfd_sd_reschedule(struct bfd_vrf_global *bvrf, int sd) |
e9e2c950 | 454 | { |
7bcadbae PG |
455 | if (sd == bvrf->bg_shop) { |
456 | THREAD_OFF(bvrf->bg_ev[0]); | |
457 | thread_add_read(master, bfd_recv_cb, bvrf, bvrf->bg_shop, | |
458 | &bvrf->bg_ev[0]); | |
459 | } else if (sd == bvrf->bg_mhop) { | |
460 | THREAD_OFF(bvrf->bg_ev[1]); | |
461 | thread_add_read(master, bfd_recv_cb, bvrf, bvrf->bg_mhop, | |
462 | &bvrf->bg_ev[1]); | |
463 | } else if (sd == bvrf->bg_shop6) { | |
464 | THREAD_OFF(bvrf->bg_ev[2]); | |
465 | thread_add_read(master, bfd_recv_cb, bvrf, bvrf->bg_shop6, | |
466 | &bvrf->bg_ev[2]); | |
467 | } else if (sd == bvrf->bg_mhop6) { | |
468 | THREAD_OFF(bvrf->bg_ev[3]); | |
469 | thread_add_read(master, bfd_recv_cb, bvrf, bvrf->bg_mhop6, | |
470 | &bvrf->bg_ev[3]); | |
471 | } else if (sd == bvrf->bg_echo) { | |
472 | THREAD_OFF(bvrf->bg_ev[4]); | |
473 | thread_add_read(master, bfd_recv_cb, bvrf, bvrf->bg_echo, | |
474 | &bvrf->bg_ev[4]); | |
475 | } else if (sd == bvrf->bg_echov6) { | |
476 | THREAD_OFF(bvrf->bg_ev[5]); | |
477 | thread_add_read(master, bfd_recv_cb, bvrf, bvrf->bg_echov6, | |
478 | &bvrf->bg_ev[5]); | |
e9e2c950 RZ |
479 | } |
480 | } | |
481 | ||
03e7f088 | 482 | static void cp_debug(bool mhop, struct sockaddr_any *peer, |
b333abc2 RZ |
483 | struct sockaddr_any *local, ifindex_t ifindex, |
484 | vrf_id_t vrfid, const char *fmt, ...) | |
03e7f088 RZ |
485 | { |
486 | char buf[512], peerstr[128], localstr[128], portstr[64], vrfstr[64]; | |
487 | va_list vl; | |
488 | ||
489 | if (peer->sa_sin.sin_family) | |
490 | snprintf(peerstr, sizeof(peerstr), " peer:%s", satostr(peer)); | |
491 | else | |
492 | peerstr[0] = 0; | |
493 | ||
494 | if (local->sa_sin.sin_family) | |
495 | snprintf(localstr, sizeof(localstr), " local:%s", | |
496 | satostr(local)); | |
497 | else | |
498 | localstr[0] = 0; | |
499 | ||
b333abc2 RZ |
500 | if (ifindex != IFINDEX_INTERNAL) |
501 | snprintf(portstr, sizeof(portstr), " port:%u", ifindex); | |
03e7f088 RZ |
502 | else |
503 | portstr[0] = 0; | |
504 | ||
b333abc2 RZ |
505 | if (vrfid != VRF_DEFAULT) |
506 | snprintf(vrfstr, sizeof(vrfstr), " vrf:%u", vrfid); | |
03e7f088 RZ |
507 | else |
508 | vrfstr[0] = 0; | |
509 | ||
510 | va_start(vl, fmt); | |
511 | vsnprintf(buf, sizeof(buf), fmt, vl); | |
512 | va_end(vl); | |
513 | ||
514 | log_debug("control-packet: %s [mhop:%s%s%s%s%s]", buf, | |
515 | mhop ? "yes" : "no", peerstr, localstr, portstr, vrfstr); | |
516 | } | |
517 | ||
e9e2c950 RZ |
518 | int bfd_recv_cb(struct thread *t) |
519 | { | |
520 | int sd = THREAD_FD(t); | |
521 | struct bfd_session *bfd; | |
522 | struct bfd_pkt *cp; | |
8a9f760e | 523 | bool is_mhop; |
e9e2c950 | 524 | ssize_t mlen = 0; |
9f37770f | 525 | uint8_t ttl = 0; |
f7b3ca19 | 526 | vrf_id_t vrfid; |
b333abc2 | 527 | ifindex_t ifindex = IFINDEX_INTERNAL; |
e9e2c950 | 528 | struct sockaddr_any local, peer; |
50571b2e | 529 | uint8_t msgbuf[1516]; |
7bcadbae | 530 | struct bfd_vrf_global *bvrf = THREAD_ARG(t); |
e9e2c950 | 531 | |
102e2157 | 532 | vrfid = bvrf->vrf->vrf_id; |
f7b3ca19 | 533 | |
e9e2c950 | 534 | /* Schedule next read. */ |
7bcadbae | 535 | bfd_sd_reschedule(bvrf, sd); |
e9e2c950 | 536 | |
03e7f088 | 537 | /* Handle echo packets. */ |
7bcadbae PG |
538 | if (sd == bvrf->bg_echo || sd == bvrf->bg_echov6) { |
539 | ptm_bfd_process_echo_pkt(bvrf, sd); | |
e9e2c950 RZ |
540 | return 0; |
541 | } | |
542 | ||
ff98a589 | 543 | /* Sanitize input/output. */ |
ff98a589 RZ |
544 | memset(&local, 0, sizeof(local)); |
545 | memset(&peer, 0, sizeof(peer)); | |
546 | ||
03e7f088 | 547 | /* Handle control packets. */ |
8a9f760e | 548 | is_mhop = false; |
7bcadbae PG |
549 | if (sd == bvrf->bg_shop || sd == bvrf->bg_mhop) { |
550 | is_mhop = sd == bvrf->bg_mhop; | |
b333abc2 | 551 | mlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), &ttl, &ifindex, |
50571b2e | 552 | &local, &peer); |
7bcadbae PG |
553 | } else if (sd == bvrf->bg_shop6 || sd == bvrf->bg_mhop6) { |
554 | is_mhop = sd == bvrf->bg_mhop6; | |
b333abc2 | 555 | mlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), &ttl, &ifindex, |
50571b2e | 556 | &local, &peer); |
e9e2c950 | 557 | } |
e9e2c950 RZ |
558 | |
559 | /* Implement RFC 5880 6.8.6 */ | |
560 | if (mlen < BFD_PKT_LEN) { | |
b333abc2 | 561 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 562 | "too small (%ld bytes)", mlen); |
e9e2c950 RZ |
563 | return 0; |
564 | } | |
565 | ||
50571b2e | 566 | /* Validate packet TTL. */ |
d8729f8c | 567 | if ((!is_mhop) && (ttl != BFD_TTL_VAL)) { |
b333abc2 | 568 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
50571b2e RZ |
569 | "invalid TTL: %d expected %d", ttl, BFD_TTL_VAL); |
570 | return 0; | |
571 | } | |
572 | ||
03e7f088 RZ |
573 | /* |
574 | * Parse the control header for inconsistencies: | |
575 | * - Invalid version; | |
576 | * - Bad multiplier configuration; | |
577 | * - Short packets; | |
578 | * - Invalid discriminator; | |
579 | */ | |
16084964 | 580 | cp = (struct bfd_pkt *)(msgbuf); |
e9e2c950 | 581 | if (BFD_GETVER(cp->diag) != BFD_VERSION) { |
b333abc2 | 582 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 583 | "bad version %d", BFD_GETVER(cp->diag)); |
e9e2c950 RZ |
584 | return 0; |
585 | } | |
586 | ||
587 | if (cp->detect_mult == 0) { | |
b333abc2 | 588 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 589 | "detect multiplier set to zero"); |
e9e2c950 RZ |
590 | return 0; |
591 | } | |
592 | ||
593 | if ((cp->len < BFD_PKT_LEN) || (cp->len > mlen)) { | |
b333abc2 | 594 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, "too small"); |
e9e2c950 RZ |
595 | return 0; |
596 | } | |
597 | ||
598 | if (cp->discrs.my_discr == 0) { | |
b333abc2 | 599 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 600 | "'my discriminator' is zero"); |
e9e2c950 RZ |
601 | return 0; |
602 | } | |
603 | ||
03e7f088 | 604 | /* Find the session that this packet belongs. */ |
b333abc2 | 605 | bfd = ptm_bfd_sess_find(cp, &peer, &local, ifindex, vrfid, is_mhop); |
e9e2c950 | 606 | if (bfd == NULL) { |
b333abc2 | 607 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 608 | "no session found"); |
e9e2c950 RZ |
609 | return 0; |
610 | } | |
611 | ||
e9e2c950 | 612 | bfd->stats.rx_ctrl_pkt++; |
03e7f088 RZ |
613 | |
614 | /* | |
615 | * Multi hop: validate packet TTL. | |
616 | * Single hop: set local address that received the packet. | |
617 | */ | |
e9e2c950 | 618 | if (is_mhop) { |
6e01e275 | 619 | if ((BFD_TTL_VAL - bfd->mh_ttl) > BFD_TTL_VAL) { |
b333abc2 | 620 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
03e7f088 | 621 | "exceeded max hop count (expected %d, got %d)", |
6e01e275 | 622 | bfd->mh_ttl, BFD_TTL_VAL); |
e9e2c950 RZ |
623 | return 0; |
624 | } | |
79b4a6fc RZ |
625 | } else if (bfd->local_address.sa_sin.sin_family == AF_UNSPEC) { |
626 | bfd->local_address = local; | |
e9e2c950 RZ |
627 | } |
628 | ||
629 | /* | |
630 | * If no interface was detected, save the interface where the | |
631 | * packet came in. | |
632 | */ | |
80edb675 | 633 | if (bfd->ifp == NULL) |
b333abc2 | 634 | bfd->ifp = if_lookup_by_index(ifindex, vrfid); |
e9e2c950 | 635 | |
03e7f088 | 636 | /* Log remote discriminator changes. */ |
e9e2c950 | 637 | if ((bfd->discrs.remote_discr != 0) |
03e7f088 | 638 | && (bfd->discrs.remote_discr != ntohl(cp->discrs.my_discr))) |
b333abc2 | 639 | cp_debug(is_mhop, &peer, &local, ifindex, vrfid, |
e945606e | 640 | "remote discriminator mismatch (expected %u, got %u)", |
03e7f088 | 641 | bfd->discrs.remote_discr, ntohl(cp->discrs.my_discr)); |
e9e2c950 RZ |
642 | |
643 | bfd->discrs.remote_discr = ntohl(cp->discrs.my_discr); | |
644 | ||
e9e2c950 RZ |
645 | /* Save remote diagnostics before state switch. */ |
646 | bfd->remote_diag = cp->diag & BFD_DIAGMASK; | |
647 | ||
c0ef9a8a RZ |
648 | /* Update remote timers settings. */ |
649 | bfd->remote_timers.desired_min_tx = ntohl(cp->timers.desired_min_tx); | |
650 | bfd->remote_timers.required_min_rx = ntohl(cp->timers.required_min_rx); | |
651 | bfd->remote_timers.required_min_echo = | |
652 | ntohl(cp->timers.required_min_echo); | |
653 | bfd->remote_detect_mult = cp->detect_mult; | |
654 | ||
9beff0bd PG |
655 | if (BFD_GETCBIT(cp->flags)) |
656 | bfd->remote_cbit = 1; | |
657 | else | |
658 | bfd->remote_cbit = 0; | |
659 | ||
aef131af RZ |
660 | /* State switch from section 6.2. */ |
661 | bs_state_handler(bfd, BFD_GETSTATE(cp->flags)); | |
e9e2c950 | 662 | |
c0ef9a8a RZ |
663 | /* RFC 5880, Section 6.5: handle POLL/FINAL negotiation sequence. */ |
664 | if (bfd->polling && BFD_GETFBIT(cp->flags)) { | |
665 | /* Disable pooling. */ | |
666 | bfd->polling = 0; | |
e9e2c950 | 667 | |
c0ef9a8a RZ |
668 | /* Handle poll finalization. */ |
669 | bs_final_handler(bfd); | |
670 | } else { | |
671 | /* Received a packet, lets update the receive timer. */ | |
672 | bfd_recvtimer_update(bfd); | |
e9e2c950 RZ |
673 | } |
674 | ||
c0ef9a8a RZ |
675 | /* Handle echo timers changes. */ |
676 | bs_echo_timer_handler(bfd); | |
e9e2c950 RZ |
677 | |
678 | /* | |
c0ef9a8a RZ |
679 | * We've received a packet with the POLL bit set, we must send |
680 | * a control packet back with the FINAL bit set. | |
681 | * | |
682 | * RFC 5880, Section 6.5. | |
e9e2c950 | 683 | */ |
0c1af3e4 RZ |
684 | if (BFD_GETPBIT(cp->flags)) { |
685 | /* We are finalizing a poll negotiation. */ | |
686 | bs_final_handler(bfd); | |
687 | ||
688 | /* Send the control packet with the final bit immediately. */ | |
c0ef9a8a | 689 | ptm_bfd_snd(bfd, 1); |
0c1af3e4 | 690 | } |
e9e2c950 RZ |
691 | |
692 | return 0; | |
693 | } | |
694 | ||
2f11c53f RZ |
695 | /* |
696 | * bp_bfd_echo_in: proccesses an BFD echo packet. On TTL == BFD_TTL_VAL | |
697 | * the packet is looped back or returns the my discriminator ID along | |
698 | * with the TTL. | |
699 | * | |
700 | * Returns -1 on error or loopback or 0 on success. | |
701 | */ | |
7bcadbae PG |
702 | int bp_bfd_echo_in(struct bfd_vrf_global *bvrf, int sd, |
703 | uint8_t *ttl, uint32_t *my_discr) | |
2f11c53f RZ |
704 | { |
705 | struct bfd_echo_pkt *bep; | |
706 | ssize_t rlen; | |
707 | struct sockaddr_any local, peer; | |
b333abc2 RZ |
708 | ifindex_t ifindex = IFINDEX_INTERNAL; |
709 | vrf_id_t vrfid = VRF_DEFAULT; | |
2f11c53f RZ |
710 | uint8_t msgbuf[1516]; |
711 | ||
7bcadbae | 712 | if (sd == bvrf->bg_echo) |
b333abc2 | 713 | rlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), ttl, &ifindex, |
2f11c53f RZ |
714 | &local, &peer); |
715 | else | |
b333abc2 | 716 | rlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), ttl, &ifindex, |
2f11c53f RZ |
717 | &local, &peer); |
718 | ||
719 | /* Short packet, better not risk reading it. */ | |
720 | if (rlen < (ssize_t)sizeof(*bep)) { | |
b333abc2 | 721 | cp_debug(false, &peer, &local, ifindex, vrfid, |
2f11c53f RZ |
722 | "small echo packet"); |
723 | return -1; | |
724 | } | |
725 | ||
726 | /* Test for loopback. */ | |
727 | if (*ttl == BFD_TTL_VAL) { | |
728 | bp_udp_send(sd, *ttl - 1, msgbuf, rlen, | |
729 | (struct sockaddr *)&peer, | |
7bcadbae | 730 | (sd == bvrf->bg_echo) ? sizeof(peer.sa_sin) |
2f11c53f RZ |
731 | : sizeof(peer.sa_sin6)); |
732 | return -1; | |
733 | } | |
734 | ||
735 | /* Read my discriminator from BFD Echo packet. */ | |
736 | bep = (struct bfd_echo_pkt *)msgbuf; | |
737 | *my_discr = ntohl(bep->my_discr); | |
738 | if (*my_discr == 0) { | |
b333abc2 | 739 | cp_debug(false, &peer, &local, ifindex, vrfid, |
2f11c53f RZ |
740 | "invalid echo packet discriminator (zero)"); |
741 | return -1; | |
742 | } | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, | |
748 | struct sockaddr *to, socklen_t tolen) | |
749 | { | |
750 | struct cmsghdr *cmsg; | |
751 | ssize_t wlen; | |
752 | int ttlval = ttl; | |
753 | bool is_ipv6 = to->sa_family == AF_INET6; | |
754 | struct msghdr msg; | |
755 | struct iovec iov[1]; | |
756 | uint8_t msgctl[255]; | |
757 | ||
758 | /* Prepare message data. */ | |
759 | iov[0].iov_base = data; | |
760 | iov[0].iov_len = datalen; | |
761 | ||
762 | memset(&msg, 0, sizeof(msg)); | |
763 | memset(msgctl, 0, sizeof(msgctl)); | |
764 | msg.msg_name = to; | |
765 | msg.msg_namelen = tolen; | |
766 | msg.msg_iov = iov; | |
767 | msg.msg_iovlen = 1; | |
768 | ||
769 | /* Prepare the packet TTL information. */ | |
770 | if (ttl > 0) { | |
771 | /* Use ancillary data. */ | |
772 | msg.msg_control = msgctl; | |
773 | msg.msg_controllen = CMSG_LEN(sizeof(ttlval)); | |
774 | ||
775 | /* Configure the ancillary data. */ | |
776 | cmsg = CMSG_FIRSTHDR(&msg); | |
777 | cmsg->cmsg_len = CMSG_LEN(sizeof(ttlval)); | |
778 | if (is_ipv6) { | |
779 | cmsg->cmsg_level = IPPROTO_IPV6; | |
780 | cmsg->cmsg_type = IPV6_HOPLIMIT; | |
781 | } else { | |
782 | #if BFD_LINUX | |
783 | cmsg->cmsg_level = IPPROTO_IP; | |
784 | cmsg->cmsg_type = IP_TTL; | |
785 | #else | |
786 | /* FreeBSD does not support TTL in ancillary data. */ | |
787 | msg.msg_control = NULL; | |
788 | msg.msg_controllen = 0; | |
789 | ||
790 | bp_set_ttl(sd, ttl); | |
791 | #endif /* BFD_BSD */ | |
792 | } | |
793 | memcpy(CMSG_DATA(cmsg), &ttlval, sizeof(ttlval)); | |
794 | } | |
795 | ||
796 | /* Send echo back. */ | |
797 | wlen = sendmsg(sd, &msg, 0); | |
798 | if (wlen <= 0) { | |
799 | log_debug("udp-send: loopback failure: (%d) %s", errno, strerror(errno)); | |
800 | return -1; | |
801 | } else if (wlen < (ssize_t)datalen) { | |
802 | log_debug("udp-send: partial send: %ld expected %ld", wlen, | |
803 | datalen); | |
804 | return -1; | |
805 | } | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
e9e2c950 RZ |
810 | |
811 | /* | |
812 | * Sockets creation. | |
813 | */ | |
814 | ||
815 | ||
816 | /* | |
817 | * IPv4 sockets | |
818 | */ | |
6e01e275 | 819 | int bp_set_ttl(int sd, uint8_t value) |
e9e2c950 | 820 | { |
6e01e275 RZ |
821 | int ttl = value; |
822 | ||
823 | if (setsockopt(sd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) { | |
824 | log_warning("set-ttl: setsockopt(IP_TTL, %d): %s", value, | |
e9e2c950 RZ |
825 | strerror(errno)); |
826 | return -1; | |
827 | } | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
6e01e275 | 832 | int bp_set_tos(int sd, uint8_t value) |
e9e2c950 | 833 | { |
6e01e275 RZ |
834 | int tos = value; |
835 | ||
836 | if (setsockopt(sd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) { | |
837 | log_warning("set-tos: setsockopt(IP_TOS, %d): %s", value, | |
e9e2c950 RZ |
838 | strerror(errno)); |
839 | return -1; | |
840 | } | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
845 | static void bp_set_ipopts(int sd) | |
846 | { | |
6e01e275 RZ |
847 | int rcvttl = BFD_RCV_TTL_VAL; |
848 | ||
849 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) | |
850 | log_fatal("set-ipopts: TTL configuration failed"); | |
e9e2c950 RZ |
851 | |
852 | if (setsockopt(sd, IPPROTO_IP, IP_RECVTTL, &rcvttl, sizeof(rcvttl)) | |
853 | == -1) | |
6e01e275 | 854 | log_fatal("set-ipopts: setsockopt(IP_RECVTTL, %d): %s", rcvttl, |
e9e2c950 RZ |
855 | strerror(errno)); |
856 | ||
857 | #ifdef BFD_LINUX | |
858 | int pktinfo = BFD_PKT_INFO_VAL; | |
6e01e275 | 859 | |
e9e2c950 RZ |
860 | /* Figure out address and interface to do the peer matching. */ |
861 | if (setsockopt(sd, IPPROTO_IP, IP_PKTINFO, &pktinfo, sizeof(pktinfo)) | |
862 | == -1) | |
6e01e275 | 863 | log_fatal("set-ipopts: setsockopt(IP_PKTINFO, %d): %s", pktinfo, |
e9e2c950 RZ |
864 | strerror(errno)); |
865 | #endif /* BFD_LINUX */ | |
866 | #ifdef BFD_BSD | |
867 | int yes = 1; | |
868 | ||
869 | /* Find out our address for peer matching. */ | |
870 | if (setsockopt(sd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) == -1) | |
6e01e275 | 871 | log_fatal("set-ipopts: setsockopt(IP_RECVDSTADDR, %d): %s", yes, |
e9e2c950 RZ |
872 | strerror(errno)); |
873 | ||
874 | /* Find out interface where the packet came in. */ | |
875 | if (setsockopt_ifindex(AF_INET, sd, yes) == -1) | |
6e01e275 | 876 | log_fatal("set-ipopts: setsockopt_ipv4_ifindex(%d): %s", yes, |
e9e2c950 RZ |
877 | strerror(errno)); |
878 | #endif /* BFD_BSD */ | |
879 | } | |
880 | ||
881 | static void bp_bind_ip(int sd, uint16_t port) | |
882 | { | |
883 | struct sockaddr_in sin; | |
884 | ||
885 | memset(&sin, 0, sizeof(sin)); | |
886 | sin.sin_family = AF_INET; | |
887 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
888 | sin.sin_port = htons(port); | |
889 | if (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1) | |
6e01e275 | 890 | log_fatal("bind-ip: bind: %s", strerror(errno)); |
e9e2c950 RZ |
891 | } |
892 | ||
4a9feb66 | 893 | int bp_udp_shop(const struct vrf *vrf) |
e9e2c950 RZ |
894 | { |
895 | int sd; | |
896 | ||
0cf6db21 | 897 | frr_with_privs(&bglobal.bfdd_privs) { |
4a9feb66 RZ |
898 | sd = vrf_socket(AF_INET, SOCK_DGRAM, PF_UNSPEC, vrf->vrf_id, |
899 | vrf->name); | |
7bcadbae | 900 | } |
e9e2c950 | 901 | if (sd == -1) |
6e01e275 | 902 | log_fatal("udp-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
903 | |
904 | bp_set_ipopts(sd); | |
905 | bp_bind_ip(sd, BFD_DEFDESTPORT); | |
e9e2c950 RZ |
906 | return sd; |
907 | } | |
908 | ||
4a9feb66 | 909 | int bp_udp_mhop(const struct vrf *vrf) |
e9e2c950 RZ |
910 | { |
911 | int sd; | |
912 | ||
0cf6db21 | 913 | frr_with_privs(&bglobal.bfdd_privs) { |
4a9feb66 RZ |
914 | sd = vrf_socket(AF_INET, SOCK_DGRAM, PF_UNSPEC, vrf->vrf_id, |
915 | vrf->name); | |
7bcadbae | 916 | } |
e9e2c950 | 917 | if (sd == -1) |
6e01e275 | 918 | log_fatal("udp-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
919 | |
920 | bp_set_ipopts(sd); | |
921 | bp_bind_ip(sd, BFD_DEF_MHOP_DEST_PORT); | |
922 | ||
923 | return sd; | |
924 | } | |
925 | ||
d245e522 | 926 | int bp_peer_socket(const struct bfd_session *bs) |
e9e2c950 RZ |
927 | { |
928 | int sd, pcount; | |
929 | struct sockaddr_in sin; | |
930 | static int srcPort = BFD_SRCPORTINIT; | |
1f4b73e5 PG |
931 | const char *device_to_bind = NULL; |
932 | ||
933 | if (bs->key.ifname[0]) | |
934 | device_to_bind = (const char *)bs->key.ifname; | |
935 | else if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) | |
936 | && bs->key.vrfname[0]) | |
937 | device_to_bind = (const char *)bs->key.vrfname; | |
e9e2c950 | 938 | |
0cf6db21 | 939 | frr_with_privs(&bglobal.bfdd_privs) { |
e52a6383 | 940 | sd = vrf_socket(AF_INET, SOCK_DGRAM, PF_UNSPEC, |
1f4b73e5 | 941 | bs->vrf->vrf_id, device_to_bind); |
e52a6383 | 942 | } |
03e7f088 RZ |
943 | if (sd == -1) { |
944 | log_error("ipv4-new: failed to create socket: %s", | |
945 | strerror(errno)); | |
e9e2c950 | 946 | return -1; |
03e7f088 | 947 | } |
e9e2c950 | 948 | |
8a9f760e RZ |
949 | /* Set TTL to 255 for all transmitted packets */ |
950 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) { | |
951 | close(sd); | |
952 | return -1; | |
e9e2c950 RZ |
953 | } |
954 | ||
955 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 956 | if (bp_set_tos(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
957 | close(sd); |
958 | return -1; | |
959 | } | |
960 | ||
e9e2c950 | 961 | /* Find an available source port in the proper range */ |
79b4a6fc | 962 | memset(&sin, 0, sizeof(sin)); |
e9e2c950 RZ |
963 | sin.sin_family = AF_INET; |
964 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
965 | sin.sin_len = sizeof(sin); | |
966 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
79b4a6fc | 967 | memcpy(&sin.sin_addr, &bs->key.local, sizeof(sin.sin_addr)); |
d245e522 | 968 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) == 0) |
e9e2c950 RZ |
969 | sin.sin_addr.s_addr = INADDR_ANY; |
970 | ||
971 | pcount = 0; | |
972 | do { | |
973 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
974 | /* Searched all ports, none available */ | |
03e7f088 RZ |
975 | log_error("ipv4-new: failed to bind port: %s", |
976 | strerror(errno)); | |
e9e2c950 RZ |
977 | close(sd); |
978 | return -1; | |
979 | } | |
980 | if (srcPort >= BFD_SRCPORTMAX) | |
981 | srcPort = BFD_SRCPORTINIT; | |
982 | sin.sin_port = htons(srcPort++); | |
983 | } while (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) < 0); | |
984 | ||
985 | return sd; | |
986 | } | |
987 | ||
988 | ||
989 | /* | |
990 | * IPv6 sockets | |
991 | */ | |
992 | ||
d245e522 | 993 | int bp_peer_socketv6(const struct bfd_session *bs) |
e9e2c950 | 994 | { |
80edb675 | 995 | int sd, pcount; |
e9e2c950 RZ |
996 | struct sockaddr_in6 sin6; |
997 | static int srcPort = BFD_SRCPORTINIT; | |
1f4b73e5 PG |
998 | const char *device_to_bind = NULL; |
999 | ||
1000 | if (bs->key.ifname[0]) | |
1001 | device_to_bind = (const char *)bs->key.ifname; | |
1002 | else if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) | |
1003 | && bs->key.vrfname[0]) | |
1004 | device_to_bind = (const char *)bs->key.vrfname; | |
e9e2c950 | 1005 | |
0cf6db21 | 1006 | frr_with_privs(&bglobal.bfdd_privs) { |
e52a6383 | 1007 | sd = vrf_socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC, |
1f4b73e5 | 1008 | bs->vrf->vrf_id, device_to_bind); |
e52a6383 | 1009 | } |
03e7f088 RZ |
1010 | if (sd == -1) { |
1011 | log_error("ipv6-new: failed to create socket: %s", | |
1012 | strerror(errno)); | |
e9e2c950 | 1013 | return -1; |
03e7f088 | 1014 | } |
e9e2c950 | 1015 | |
8a9f760e RZ |
1016 | /* Set TTL to 255 for all transmitted packets */ |
1017 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) != 0) { | |
1018 | close(sd); | |
1019 | return -1; | |
e9e2c950 RZ |
1020 | } |
1021 | ||
1022 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 1023 | if (bp_set_tosv6(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
1024 | close(sd); |
1025 | return -1; | |
1026 | } | |
1027 | ||
1028 | /* Find an available source port in the proper range */ | |
79b4a6fc | 1029 | memset(&sin6, 0, sizeof(sin6)); |
e9e2c950 RZ |
1030 | sin6.sin6_family = AF_INET6; |
1031 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1032 | sin6.sin6_len = sizeof(sin6); | |
1033 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
79b4a6fc RZ |
1034 | memcpy(&sin6.sin6_addr, &bs->key.local, sizeof(sin6.sin6_addr)); |
1035 | if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) | |
1036 | sin6.sin6_scope_id = bs->ifp->ifindex; | |
e9e2c950 | 1037 | |
e9e2c950 RZ |
1038 | pcount = 0; |
1039 | do { | |
1040 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
1041 | /* Searched all ports, none available */ | |
03e7f088 RZ |
1042 | log_error("ipv6-new: failed to bind port: %s", |
1043 | strerror(errno)); | |
e9e2c950 RZ |
1044 | close(sd); |
1045 | return -1; | |
1046 | } | |
1047 | if (srcPort >= BFD_SRCPORTMAX) | |
1048 | srcPort = BFD_SRCPORTINIT; | |
1049 | sin6.sin6_port = htons(srcPort++); | |
1050 | } while (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) < 0); | |
1051 | ||
1052 | return sd; | |
1053 | } | |
1054 | ||
6e01e275 | 1055 | int bp_set_ttlv6(int sd, uint8_t value) |
e9e2c950 | 1056 | { |
6e01e275 RZ |
1057 | int ttl = value; |
1058 | ||
1059 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) | |
e9e2c950 | 1060 | == -1) { |
6e01e275 RZ |
1061 | log_warning("set-ttlv6: setsockopt(IPV6_UNICAST_HOPS, %d): %s", |
1062 | value, strerror(errno)); | |
e9e2c950 RZ |
1063 | return -1; |
1064 | } | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
6e01e275 | 1069 | int bp_set_tosv6(int sd, uint8_t value) |
e9e2c950 | 1070 | { |
6e01e275 RZ |
1071 | int tos = value; |
1072 | ||
1073 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) | |
e9e2c950 | 1074 | == -1) { |
6e01e275 | 1075 | log_warning("set-tosv6: setsockopt(IPV6_TCLASS, %d): %s", value, |
e9e2c950 RZ |
1076 | strerror(errno)); |
1077 | return -1; | |
1078 | } | |
1079 | ||
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static void bp_set_ipv6opts(int sd) | |
1084 | { | |
6e01e275 RZ |
1085 | int ipv6_pktinfo = BFD_IPV6_PKT_INFO_VAL; |
1086 | int ipv6_only = BFD_IPV6_ONLY_VAL; | |
e9e2c950 | 1087 | |
6e01e275 RZ |
1088 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) == -1) |
1089 | log_fatal("set-ipv6opts: setsockopt(IPV6_UNICAST_HOPS, %d): %s", | |
1090 | BFD_TTL_VAL, strerror(errno)); | |
e9e2c950 | 1091 | |
6e01e275 RZ |
1092 | if (setsockopt_ipv6_hoplimit(sd, BFD_RCV_TTL_VAL) == -1) |
1093 | log_fatal("set-ipv6opts: setsockopt(IPV6_HOPLIMIT, %d): %s", | |
1094 | BFD_RCV_TTL_VAL, strerror(errno)); | |
e9e2c950 RZ |
1095 | |
1096 | if (setsockopt_ipv6_pktinfo(sd, ipv6_pktinfo) == -1) | |
6e01e275 RZ |
1097 | log_fatal("set-ipv6opts: setsockopt(IPV6_PKTINFO, %d): %s", |
1098 | ipv6_pktinfo, strerror(errno)); | |
e9e2c950 RZ |
1099 | |
1100 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6_only, | |
1101 | sizeof(ipv6_only)) | |
1102 | == -1) | |
6e01e275 RZ |
1103 | log_fatal("set-ipv6opts: setsockopt(IPV6_V6ONLY, %d): %s", |
1104 | ipv6_only, strerror(errno)); | |
e9e2c950 RZ |
1105 | } |
1106 | ||
1107 | static void bp_bind_ipv6(int sd, uint16_t port) | |
1108 | { | |
1109 | struct sockaddr_in6 sin6; | |
1110 | ||
1111 | memset(&sin6, 0, sizeof(sin6)); | |
1112 | sin6.sin6_family = AF_INET6; | |
1113 | sin6.sin6_addr = in6addr_any; | |
1114 | sin6.sin6_port = htons(port); | |
1115 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1116 | sin6.sin6_len = sizeof(sin6); | |
1117 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1118 | if (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) == -1) | |
6e01e275 | 1119 | log_fatal("bind-ipv6: bind: %s", strerror(errno)); |
e9e2c950 RZ |
1120 | } |
1121 | ||
4a9feb66 | 1122 | int bp_udp6_shop(const struct vrf *vrf) |
e9e2c950 RZ |
1123 | { |
1124 | int sd; | |
1125 | ||
0cf6db21 | 1126 | frr_with_privs(&bglobal.bfdd_privs) { |
4a9feb66 RZ |
1127 | sd = vrf_socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC, vrf->vrf_id, |
1128 | vrf->name); | |
7bcadbae | 1129 | } |
e9e2c950 | 1130 | if (sd == -1) |
6e01e275 | 1131 | log_fatal("udp6-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1132 | |
1133 | bp_set_ipv6opts(sd); | |
1134 | bp_bind_ipv6(sd, BFD_DEFDESTPORT); | |
1135 | ||
1136 | return sd; | |
1137 | } | |
1138 | ||
4a9feb66 | 1139 | int bp_udp6_mhop(const struct vrf *vrf) |
e9e2c950 RZ |
1140 | { |
1141 | int sd; | |
1142 | ||
0cf6db21 | 1143 | frr_with_privs(&bglobal.bfdd_privs) { |
4a9feb66 RZ |
1144 | sd = vrf_socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC, vrf->vrf_id, |
1145 | vrf->name); | |
7bcadbae | 1146 | } |
e9e2c950 | 1147 | if (sd == -1) |
6e01e275 | 1148 | log_fatal("udp6-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1149 | |
1150 | bp_set_ipv6opts(sd); | |
1151 | bp_bind_ipv6(sd, BFD_DEF_MHOP_DEST_PORT); | |
1152 | ||
1153 | return sd; | |
1154 | } | |
2f11c53f | 1155 | |
4a9feb66 | 1156 | int bp_echo_socket(const struct vrf *vrf) |
2f11c53f RZ |
1157 | { |
1158 | int s; | |
1159 | ||
0cf6db21 | 1160 | frr_with_privs(&bglobal.bfdd_privs) { |
4a9feb66 | 1161 | s = vrf_socket(AF_INET, SOCK_DGRAM, 0, vrf->vrf_id, vrf->name); |
7bcadbae | 1162 | } |
2f11c53f RZ |
1163 | if (s == -1) |
1164 | log_fatal("echo-socket: socket: %s", strerror(errno)); | |
1165 | ||
1166 | bp_set_ipopts(s); | |
1167 | bp_bind_ip(s, BFD_DEF_ECHO_PORT); | |
1168 | ||
1169 | return s; | |
1170 | } | |
1171 | ||
4a9feb66 | 1172 | int bp_echov6_socket(const struct vrf *vrf) |
2f11c53f RZ |
1173 | { |
1174 | int s; | |
1175 | ||
0cf6db21 | 1176 | frr_with_privs(&bglobal.bfdd_privs) { |
4a9feb66 | 1177 | s = vrf_socket(AF_INET6, SOCK_DGRAM, 0, vrf->vrf_id, vrf->name); |
7bcadbae | 1178 | } |
2f11c53f RZ |
1179 | if (s == -1) |
1180 | log_fatal("echov6-socket: socket: %s", strerror(errno)); | |
1181 | ||
1182 | bp_set_ipv6opts(s); | |
1183 | bp_bind_ipv6(s, BFD_DEF_ECHO_PORT); | |
1184 | ||
1185 | return s; | |
1186 | } |