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e9e2c950 RZ |
1 | /********************************************************************* |
2 | * Copyright 2017 Cumulus Networks, Inc. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; either version 2 of the License, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; see the file COPYING; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | * | |
18 | * bfd_packet.c: implements the BFD protocol packet handling. | |
19 | * | |
20 | * Authors | |
21 | * ------- | |
22 | * Shrijeet Mukherjee [shm@cumulusnetworks.com] | |
23 | * Kanna Rajagopal [kanna@cumulusnetworks.com] | |
24 | * Radhika Mahankali [Radhika@cumulusnetworks.com] | |
25 | */ | |
26 | ||
27 | #include <zebra.h> | |
28 | ||
29 | #ifdef BFD_LINUX | |
30 | #include <linux/if_packet.h> | |
31 | #endif /* BFD_LINUX */ | |
32 | ||
e9e2c950 | 33 | #include <netinet/if_ether.h> |
e9e2c950 | 34 | #include <netinet/udp.h> |
e9e2c950 RZ |
35 | |
36 | #include "lib/sockopt.h" | |
37 | ||
38 | #include "bfd.h" | |
39 | ||
8a9f760e | 40 | |
e9e2c950 RZ |
41 | /* |
42 | * Prototypes | |
43 | */ | |
e9e2c950 | 44 | static int ptm_bfd_process_echo_pkt(int s); |
2f11c53f RZ |
45 | int _ptm_bfd_send(struct bfd_session *bs, uint16_t *port, const void *data, |
46 | size_t datalen); | |
e9e2c950 RZ |
47 | |
48 | static void bfd_sd_reschedule(int sd); | |
50571b2e RZ |
49 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
50 | char *port, size_t portlen, char *vrfname, | |
51 | size_t vrfnamelen, struct sockaddr_any *local, | |
52 | struct sockaddr_any *peer); | |
53 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, | |
54 | char *port, size_t portlen, char *vrfname, | |
55 | size_t vrfnamelen, struct sockaddr_any *local, | |
56 | struct sockaddr_any *peer); | |
2f11c53f RZ |
57 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, |
58 | struct sockaddr *to, socklen_t tolen); | |
59 | int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr); | |
e9e2c950 RZ |
60 | |
61 | /* socket related prototypes */ | |
62 | static void bp_set_ipopts(int sd); | |
63 | static void bp_bind_ip(int sd, uint16_t port); | |
64 | static void bp_set_ipv6opts(int sd); | |
65 | static void bp_bind_ipv6(int sd, uint16_t port); | |
66 | ||
67 | ||
68 | /* | |
69 | * Functions | |
70 | */ | |
2f11c53f RZ |
71 | int _ptm_bfd_send(struct bfd_session *bs, uint16_t *port, const void *data, |
72 | size_t datalen) | |
e9e2c950 RZ |
73 | { |
74 | struct sockaddr *sa; | |
75 | struct sockaddr_in sin; | |
76 | struct sockaddr_in6 sin6; | |
e9e2c950 RZ |
77 | socklen_t slen; |
78 | ssize_t rv; | |
79 | int sd = -1; | |
80 | ||
2f11c53f | 81 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6)) { |
e9e2c950 RZ |
82 | memset(&sin6, 0, sizeof(sin6)); |
83 | sin6.sin6_family = AF_INET6; | |
84 | sin6.sin6_addr = bs->shop.peer.sa_sin6.sin6_addr; | |
85 | sin6.sin6_port = | |
86 | (port) ? *port | |
87 | : (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) | |
88 | ? htons(BFD_DEF_MHOP_DEST_PORT) | |
89 | : htons(BFD_DEFDESTPORT); | |
90 | ||
91 | sd = bs->sock; | |
92 | sa = (struct sockaddr *)&sin6; | |
93 | slen = sizeof(sin6); | |
94 | } else { | |
95 | memset(&sin, 0, sizeof(sin)); | |
96 | sin.sin_family = AF_INET; | |
97 | sin.sin_addr = bs->shop.peer.sa_sin.sin_addr; | |
98 | sin.sin_port = | |
99 | (port) ? *port | |
100 | : (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) | |
101 | ? htons(BFD_DEF_MHOP_DEST_PORT) | |
102 | : htons(BFD_DEFDESTPORT); | |
103 | ||
104 | sd = bs->sock; | |
105 | sa = (struct sockaddr *)&sin; | |
106 | slen = sizeof(sin); | |
107 | } | |
108 | ||
109 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
110 | sa->sa_len = slen; | |
111 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
112 | rv = sendto(sd, data, datalen, 0, sa, slen); | |
113 | if (rv <= 0) { | |
03e7f088 | 114 | log_debug("packet-send: send failure: %s", strerror(errno)); |
e9e2c950 RZ |
115 | return -1; |
116 | } | |
03e7f088 RZ |
117 | if (rv < (ssize_t)datalen) |
118 | log_debug("packet-send: send partial", strerror(errno)); | |
e9e2c950 RZ |
119 | |
120 | return 0; | |
121 | } | |
122 | ||
e9e2c950 RZ |
123 | void ptm_bfd_echo_snd(struct bfd_session *bfd) |
124 | { | |
2f11c53f RZ |
125 | struct sockaddr_any *sa; |
126 | socklen_t salen; | |
127 | int sd; | |
128 | struct bfd_echo_pkt bep; | |
129 | struct sockaddr_in sin; | |
130 | struct sockaddr_in6 sin6; | |
e9e2c950 | 131 | |
2f11c53f | 132 | if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) |
e9e2c950 | 133 | BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE); |
e9e2c950 | 134 | |
2f11c53f RZ |
135 | memset(&bep, 0, sizeof(bep)); |
136 | bep.ver = BFD_ECHO_VERSION; | |
137 | bep.len = BFD_ECHO_PKT_LEN; | |
138 | bep.my_discr = htonl(bfd->discrs.my_discr); | |
139 | ||
140 | sa = BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_MH) ? &bfd->mhop.peer | |
141 | : &bfd->shop.peer; | |
142 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_IPV6)) { | |
143 | sd = bglobal.bg_echov6; | |
144 | sin6 = sa->sa_sin6; | |
145 | sin6.sin6_port = htons(BFD_DEF_ECHO_PORT); | |
146 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
147 | sin6.sin6_len = sizeof(sin6); | |
148 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
149 | ||
150 | sa = (struct sockaddr_any *)&sin6; | |
151 | salen = sizeof(sin6); | |
e9e2c950 | 152 | } else { |
2f11c53f RZ |
153 | sd = bglobal.bg_echo; |
154 | sin = sa->sa_sin; | |
155 | sin.sin_port = htons(BFD_DEF_ECHO_PORT); | |
156 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
157 | sin.sin_len = sizeof(sin); | |
158 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 | 159 | |
2f11c53f RZ |
160 | sa = (struct sockaddr_any *)&sin; |
161 | salen = sizeof(sin); | |
e9e2c950 | 162 | } |
2f11c53f RZ |
163 | if (bp_udp_send(sd, BFD_TTL_VAL, (uint8_t *)&bep, sizeof(bep), |
164 | (struct sockaddr *)sa, salen) | |
165 | == -1) | |
166 | return; | |
e9e2c950 RZ |
167 | |
168 | bfd->stats.tx_echo_pkt++; | |
169 | } | |
170 | ||
e9e2c950 RZ |
171 | static int ptm_bfd_process_echo_pkt(int s) |
172 | { | |
e9e2c950 | 173 | struct bfd_session *bfd; |
2f11c53f RZ |
174 | uint32_t my_discr = 0; |
175 | uint8_t ttl = 0; | |
e9e2c950 | 176 | |
2f11c53f RZ |
177 | /* Receive and parse echo packet. */ |
178 | if (bp_bfd_echo_in(s, &ttl, &my_discr) == -1) | |
179 | return 0; | |
e9e2c950 RZ |
180 | |
181 | /* Your discriminator not zero - use it to find session */ | |
182 | bfd = bfd_id_lookup(my_discr); | |
183 | if (bfd == NULL) { | |
03e7f088 | 184 | log_debug("echo-packet: no matching session (id:%u)", my_discr); |
e9e2c950 RZ |
185 | return -1; |
186 | } | |
187 | ||
188 | if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) { | |
9835f17d RZ |
189 | log_debug("echo-packet: echo disabled [%s] (id:%u)", |
190 | bs_to_string(bfd), my_discr); | |
e9e2c950 RZ |
191 | return -1; |
192 | } | |
193 | ||
194 | bfd->stats.rx_echo_pkt++; | |
195 | ||
196 | /* Compute detect time */ | |
197 | bfd->echo_detect_TO = bfd->remote_detect_mult * bfd->echo_xmt_TO; | |
198 | ||
199 | /* Update echo receive timeout. */ | |
451eb5a2 RZ |
200 | if (bfd->echo_detect_TO > 0) |
201 | bfd_echo_recvtimer_update(bfd); | |
e9e2c950 RZ |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
206 | void ptm_bfd_snd(struct bfd_session *bfd, int fbit) | |
207 | { | |
208 | struct bfd_pkt cp; | |
209 | ||
e9e2c950 RZ |
210 | /* Set fields according to section 6.5.7 */ |
211 | cp.diag = bfd->local_diag; | |
212 | BFD_SETVER(cp.diag, BFD_VERSION); | |
213 | cp.flags = 0; | |
214 | BFD_SETSTATE(cp.flags, bfd->ses_state); | |
215 | BFD_SETDEMANDBIT(cp.flags, BFD_DEF_DEMAND); | |
216 | BFD_SETPBIT(cp.flags, bfd->polling); | |
217 | BFD_SETFBIT(cp.flags, fbit); | |
218 | cp.detect_mult = bfd->detect_mult; | |
219 | cp.len = BFD_PKT_LEN; | |
220 | cp.discrs.my_discr = htonl(bfd->discrs.my_discr); | |
221 | cp.discrs.remote_discr = htonl(bfd->discrs.remote_discr); | |
222 | if (bfd->polling) { | |
223 | cp.timers.desired_min_tx = | |
224 | htonl(bfd->new_timers.desired_min_tx); | |
225 | cp.timers.required_min_rx = | |
226 | htonl(bfd->new_timers.required_min_rx); | |
227 | } else { | |
228 | cp.timers.desired_min_tx = htonl(bfd->timers.desired_min_tx); | |
229 | cp.timers.required_min_rx = htonl(bfd->timers.required_min_rx); | |
230 | } | |
231 | cp.timers.required_min_echo = htonl(bfd->timers.required_min_echo); | |
232 | ||
2f11c53f | 233 | if (_ptm_bfd_send(bfd, NULL, &cp, BFD_PKT_LEN) != 0) |
e9e2c950 | 234 | return; |
e9e2c950 RZ |
235 | |
236 | bfd->stats.tx_ctrl_pkt++; | |
237 | } | |
238 | ||
50571b2e RZ |
239 | ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
240 | char *port, size_t portlen, char *vrfname, | |
241 | size_t vrfnamelen, struct sockaddr_any *local, | |
242 | struct sockaddr_any *peer) | |
e9e2c950 RZ |
243 | { |
244 | struct cmsghdr *cm; | |
245 | int ifindex; | |
246 | ssize_t mlen; | |
16084964 RZ |
247 | struct sockaddr_in msgaddr; |
248 | struct msghdr msghdr; | |
249 | struct iovec iov[1]; | |
250 | uint8_t cmsgbuf[255]; | |
251 | ||
e10cfdaf DL |
252 | port[0] = '\0'; |
253 | ||
16084964 RZ |
254 | /* Prepare the recvmsg params. */ |
255 | iov[0].iov_base = msgbuf; | |
50571b2e | 256 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
257 | |
258 | memset(&msghdr, 0, sizeof(msghdr)); | |
259 | msghdr.msg_name = &msgaddr; | |
260 | msghdr.msg_namelen = sizeof(msgaddr); | |
261 | msghdr.msg_iov = iov; | |
262 | msghdr.msg_iovlen = 1; | |
263 | msghdr.msg_control = cmsgbuf; | |
264 | msghdr.msg_controllen = sizeof(cmsgbuf); | |
265 | ||
e9e2c950 RZ |
266 | mlen = recvmsg(sd, &msghdr, MSG_DONTWAIT); |
267 | if (mlen == -1) { | |
03e7f088 RZ |
268 | if (errno != EAGAIN) |
269 | log_error("ipv4-recv: recv failed: %s", | |
270 | strerror(errno)); | |
271 | ||
e9e2c950 RZ |
272 | return -1; |
273 | } | |
274 | ||
275 | /* Get source address */ | |
276 | peer->sa_sin = *((struct sockaddr_in *)(msghdr.msg_name)); | |
277 | ||
278 | /* Get and check TTL */ | |
279 | for (cm = CMSG_FIRSTHDR(&msghdr); cm != NULL; | |
280 | cm = CMSG_NXTHDR(&msghdr, cm)) { | |
281 | if (cm->cmsg_level != IPPROTO_IP) | |
282 | continue; | |
283 | ||
284 | switch (cm->cmsg_type) { | |
285 | #ifdef BFD_LINUX | |
286 | case IP_TTL: { | |
50571b2e RZ |
287 | uint32_t ttlval; |
288 | ||
289 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); | |
290 | if (ttlval > 255) { | |
291 | log_debug("ipv4-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
292 | return -1; |
293 | } | |
50571b2e | 294 | *ttl = ttlval; |
e9e2c950 RZ |
295 | break; |
296 | } | |
297 | ||
298 | case IP_PKTINFO: { | |
299 | struct in_pktinfo *pi = | |
300 | (struct in_pktinfo *)CMSG_DATA(cm); | |
301 | ||
302 | if (pi == NULL) | |
303 | break; | |
304 | ||
305 | local->sa_sin.sin_family = AF_INET; | |
306 | local->sa_sin.sin_addr = pi->ipi_addr; | |
f43a14d2 RZ |
307 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
308 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
309 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 RZ |
310 | fetch_portname_from_ifindex(pi->ipi_ifindex, port, |
311 | portlen); | |
312 | break; | |
313 | } | |
314 | #endif /* BFD_LINUX */ | |
315 | #ifdef BFD_BSD | |
316 | case IP_RECVTTL: { | |
50571b2e | 317 | memcpy(ttl, CMSG_DATA(cm), sizeof(*ttl)); |
e9e2c950 RZ |
318 | break; |
319 | } | |
320 | ||
321 | case IP_RECVDSTADDR: { | |
322 | struct in_addr ia; | |
323 | ||
324 | memcpy(&ia, CMSG_DATA(cm), sizeof(ia)); | |
325 | local->sa_sin.sin_family = AF_INET; | |
326 | local->sa_sin.sin_addr = ia; | |
f43a14d2 RZ |
327 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
328 | local->sa_sin.sin_len = sizeof(local->sa_sin); | |
329 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 RZ |
330 | break; |
331 | } | |
332 | #endif /* BFD_BSD */ | |
333 | ||
334 | default: | |
335 | /* | |
336 | * On *BSDs we expect to land here when skipping | |
337 | * the IP_RECVIF header. It will be handled by | |
338 | * getsockopt_ifindex() below. | |
339 | */ | |
340 | /* NOTHING */ | |
341 | break; | |
342 | } | |
343 | } | |
344 | ||
345 | /* OS agnostic way of getting interface name. */ | |
346 | if (port[0] == 0) { | |
347 | ifindex = getsockopt_ifindex(AF_INET, &msghdr); | |
348 | if (ifindex > 0) | |
349 | fetch_portname_from_ifindex(ifindex, port, portlen); | |
350 | } | |
351 | ||
352 | return mlen; | |
353 | } | |
354 | ||
50571b2e RZ |
355 | ssize_t bfd_recv_ipv6(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl, |
356 | char *port, size_t portlen, char *vrfname, | |
357 | size_t vrfnamelen, struct sockaddr_any *local, | |
358 | struct sockaddr_any *peer) | |
e9e2c950 RZ |
359 | { |
360 | struct cmsghdr *cm; | |
361 | struct in6_pktinfo *pi6 = NULL; | |
43adc702 | 362 | int ifindex = 0; |
e9e2c950 | 363 | ssize_t mlen; |
6e01e275 | 364 | uint32_t ttlval; |
16084964 RZ |
365 | struct sockaddr_in6 msgaddr6; |
366 | struct msghdr msghdr6; | |
367 | struct iovec iov[1]; | |
368 | uint8_t cmsgbuf6[255]; | |
369 | ||
370 | /* Prepare the recvmsg params. */ | |
371 | iov[0].iov_base = msgbuf; | |
50571b2e | 372 | iov[0].iov_len = msgbuflen; |
16084964 RZ |
373 | |
374 | memset(&msghdr6, 0, sizeof(msghdr6)); | |
375 | msghdr6.msg_name = &msgaddr6; | |
376 | msghdr6.msg_namelen = sizeof(msgaddr6); | |
377 | msghdr6.msg_iov = iov; | |
378 | msghdr6.msg_iovlen = 1; | |
379 | msghdr6.msg_control = cmsgbuf6; | |
380 | msghdr6.msg_controllen = sizeof(cmsgbuf6); | |
381 | ||
e9e2c950 RZ |
382 | mlen = recvmsg(sd, &msghdr6, MSG_DONTWAIT); |
383 | if (mlen == -1) { | |
03e7f088 | 384 | if (errno != EAGAIN) |
6e01e275 | 385 | log_error("ipv6-recv: recv failed: %s", |
03e7f088 RZ |
386 | strerror(errno)); |
387 | ||
e9e2c950 RZ |
388 | return -1; |
389 | } | |
390 | ||
391 | /* Get source address */ | |
392 | peer->sa_sin6 = *((struct sockaddr_in6 *)(msghdr6.msg_name)); | |
393 | ||
394 | /* Get and check TTL */ | |
395 | for (cm = CMSG_FIRSTHDR(&msghdr6); cm != NULL; | |
396 | cm = CMSG_NXTHDR(&msghdr6, cm)) { | |
397 | if (cm->cmsg_level != IPPROTO_IPV6) | |
398 | continue; | |
399 | ||
400 | if (cm->cmsg_type == IPV6_HOPLIMIT) { | |
6e01e275 | 401 | memcpy(&ttlval, CMSG_DATA(cm), sizeof(ttlval)); |
50571b2e RZ |
402 | if (ttlval > 255) { |
403 | log_debug("ipv6-recv: invalid TTL: %u", ttlval); | |
e9e2c950 RZ |
404 | return -1; |
405 | } | |
50571b2e RZ |
406 | |
407 | *ttl = ttlval; | |
e9e2c950 RZ |
408 | } else if (cm->cmsg_type == IPV6_PKTINFO) { |
409 | pi6 = (struct in6_pktinfo *)CMSG_DATA(cm); | |
410 | if (pi6) { | |
f43a14d2 | 411 | local->sa_sin6.sin6_family = AF_INET6; |
e9e2c950 | 412 | local->sa_sin6.sin6_addr = pi6->ipi6_addr; |
f43a14d2 RZ |
413 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
414 | local->sa_sin6.sin6_len = sizeof(local->sa_sin6); | |
415 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
e9e2c950 RZ |
416 | fetch_portname_from_ifindex(pi6->ipi6_ifindex, |
417 | port, portlen); | |
43adc702 | 418 | ifindex = pi6->ipi6_ifindex; |
e9e2c950 RZ |
419 | } |
420 | } | |
421 | } | |
422 | ||
43adc702 RZ |
423 | /* Set scope ID for link local addresses. */ |
424 | if (IN6_IS_ADDR_LINKLOCAL(&peer->sa_sin6.sin6_addr)) | |
425 | peer->sa_sin6.sin6_scope_id = ifindex; | |
426 | if (IN6_IS_ADDR_LINKLOCAL(&local->sa_sin6.sin6_addr)) | |
427 | local->sa_sin6.sin6_scope_id = ifindex; | |
428 | ||
e9e2c950 RZ |
429 | return mlen; |
430 | } | |
431 | ||
432 | static void bfd_sd_reschedule(int sd) | |
433 | { | |
434 | if (sd == bglobal.bg_shop) { | |
8529e180 | 435 | THREAD_OFF(bglobal.bg_ev[0]); |
e9e2c950 RZ |
436 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop, |
437 | &bglobal.bg_ev[0]); | |
438 | } else if (sd == bglobal.bg_mhop) { | |
8529e180 | 439 | THREAD_OFF(bglobal.bg_ev[1]); |
e9e2c950 RZ |
440 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop, |
441 | &bglobal.bg_ev[1]); | |
442 | } else if (sd == bglobal.bg_shop6) { | |
8529e180 | 443 | THREAD_OFF(bglobal.bg_ev[2]); |
e9e2c950 RZ |
444 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_shop6, |
445 | &bglobal.bg_ev[2]); | |
446 | } else if (sd == bglobal.bg_mhop6) { | |
8529e180 | 447 | THREAD_OFF(bglobal.bg_ev[3]); |
e9e2c950 RZ |
448 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_mhop6, |
449 | &bglobal.bg_ev[3]); | |
450 | } else if (sd == bglobal.bg_echo) { | |
8529e180 | 451 | THREAD_OFF(bglobal.bg_ev[4]); |
e9e2c950 RZ |
452 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echo, |
453 | &bglobal.bg_ev[4]); | |
2f11c53f | 454 | } else if (sd == bglobal.bg_echov6) { |
8529e180 | 455 | THREAD_OFF(bglobal.bg_ev[5]); |
2f11c53f RZ |
456 | thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echov6, |
457 | &bglobal.bg_ev[5]); | |
e9e2c950 RZ |
458 | } |
459 | } | |
460 | ||
03e7f088 RZ |
461 | static void cp_debug(bool mhop, struct sockaddr_any *peer, |
462 | struct sockaddr_any *local, const char *port, | |
463 | const char *vrf, const char *fmt, ...) | |
464 | { | |
465 | char buf[512], peerstr[128], localstr[128], portstr[64], vrfstr[64]; | |
466 | va_list vl; | |
467 | ||
468 | if (peer->sa_sin.sin_family) | |
469 | snprintf(peerstr, sizeof(peerstr), " peer:%s", satostr(peer)); | |
470 | else | |
471 | peerstr[0] = 0; | |
472 | ||
473 | if (local->sa_sin.sin_family) | |
474 | snprintf(localstr, sizeof(localstr), " local:%s", | |
475 | satostr(local)); | |
476 | else | |
477 | localstr[0] = 0; | |
478 | ||
479 | if (port[0]) | |
480 | snprintf(portstr, sizeof(portstr), " port:%s", port); | |
481 | else | |
482 | portstr[0] = 0; | |
483 | ||
484 | if (vrf[0]) | |
485 | snprintf(vrfstr, sizeof(vrfstr), " vrf:%s", port); | |
486 | else | |
487 | vrfstr[0] = 0; | |
488 | ||
489 | va_start(vl, fmt); | |
490 | vsnprintf(buf, sizeof(buf), fmt, vl); | |
491 | va_end(vl); | |
492 | ||
493 | log_debug("control-packet: %s [mhop:%s%s%s%s%s]", buf, | |
494 | mhop ? "yes" : "no", peerstr, localstr, portstr, vrfstr); | |
495 | } | |
496 | ||
e9e2c950 RZ |
497 | int bfd_recv_cb(struct thread *t) |
498 | { | |
499 | int sd = THREAD_FD(t); | |
500 | struct bfd_session *bfd; | |
501 | struct bfd_pkt *cp; | |
8a9f760e | 502 | bool is_mhop; |
e9e2c950 | 503 | ssize_t mlen = 0; |
e9e2c950 | 504 | uint32_t oldEchoXmt_TO, oldXmtTime; |
50571b2e | 505 | uint8_t ttl; |
e9e2c950 RZ |
506 | struct sockaddr_any local, peer; |
507 | char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1]; | |
50571b2e | 508 | uint8_t msgbuf[1516]; |
e9e2c950 RZ |
509 | |
510 | /* Schedule next read. */ | |
511 | bfd_sd_reschedule(sd); | |
512 | ||
03e7f088 | 513 | /* Handle echo packets. */ |
2f11c53f | 514 | if (sd == bglobal.bg_echo || sd == bglobal.bg_echov6) { |
e9e2c950 RZ |
515 | ptm_bfd_process_echo_pkt(sd); |
516 | return 0; | |
517 | } | |
518 | ||
ff98a589 RZ |
519 | /* Sanitize input/output. */ |
520 | memset(port, 0, sizeof(port)); | |
521 | memset(vrfname, 0, sizeof(vrfname)); | |
522 | memset(&local, 0, sizeof(local)); | |
523 | memset(&peer, 0, sizeof(peer)); | |
524 | ||
03e7f088 | 525 | /* Handle control packets. */ |
8a9f760e | 526 | is_mhop = false; |
e9e2c950 RZ |
527 | if (sd == bglobal.bg_shop || sd == bglobal.bg_mhop) { |
528 | is_mhop = sd == bglobal.bg_mhop; | |
50571b2e RZ |
529 | mlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), &ttl, port, |
530 | sizeof(port), vrfname, sizeof(vrfname), | |
531 | &local, &peer); | |
e9e2c950 RZ |
532 | } else if (sd == bglobal.bg_shop6 || sd == bglobal.bg_mhop6) { |
533 | is_mhop = sd == bglobal.bg_mhop6; | |
50571b2e RZ |
534 | mlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), &ttl, port, |
535 | sizeof(port), vrfname, sizeof(vrfname), | |
536 | &local, &peer); | |
e9e2c950 | 537 | } |
e9e2c950 RZ |
538 | |
539 | /* Implement RFC 5880 6.8.6 */ | |
540 | if (mlen < BFD_PKT_LEN) { | |
03e7f088 RZ |
541 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
542 | "too small (%ld bytes)", mlen); | |
e9e2c950 RZ |
543 | return 0; |
544 | } | |
545 | ||
50571b2e RZ |
546 | /* Validate packet TTL. */ |
547 | if ((is_mhop == false) && (ttl != BFD_TTL_VAL)) { | |
548 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
549 | "invalid TTL: %d expected %d", ttl, BFD_TTL_VAL); | |
550 | return 0; | |
551 | } | |
552 | ||
03e7f088 RZ |
553 | /* |
554 | * Parse the control header for inconsistencies: | |
555 | * - Invalid version; | |
556 | * - Bad multiplier configuration; | |
557 | * - Short packets; | |
558 | * - Invalid discriminator; | |
559 | */ | |
16084964 | 560 | cp = (struct bfd_pkt *)(msgbuf); |
e9e2c950 | 561 | if (BFD_GETVER(cp->diag) != BFD_VERSION) { |
03e7f088 RZ |
562 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
563 | "bad version %d", BFD_GETVER(cp->diag)); | |
e9e2c950 RZ |
564 | return 0; |
565 | } | |
566 | ||
567 | if (cp->detect_mult == 0) { | |
03e7f088 RZ |
568 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
569 | "detect multiplier set to zero"); | |
e9e2c950 RZ |
570 | return 0; |
571 | } | |
572 | ||
573 | if ((cp->len < BFD_PKT_LEN) || (cp->len > mlen)) { | |
03e7f088 | 574 | cp_debug(is_mhop, &peer, &local, port, vrfname, "too small"); |
e9e2c950 RZ |
575 | return 0; |
576 | } | |
577 | ||
578 | if (cp->discrs.my_discr == 0) { | |
03e7f088 RZ |
579 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
580 | "'my discriminator' is zero"); | |
e9e2c950 RZ |
581 | return 0; |
582 | } | |
583 | ||
03e7f088 | 584 | /* Find the session that this packet belongs. */ |
e9e2c950 RZ |
585 | bfd = ptm_bfd_sess_find(cp, port, &peer, &local, vrfname, is_mhop); |
586 | if (bfd == NULL) { | |
03e7f088 RZ |
587 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
588 | "no session found"); | |
e9e2c950 RZ |
589 | return 0; |
590 | } | |
591 | ||
e9e2c950 | 592 | bfd->stats.rx_ctrl_pkt++; |
03e7f088 RZ |
593 | |
594 | /* | |
595 | * Multi hop: validate packet TTL. | |
596 | * Single hop: set local address that received the packet. | |
597 | */ | |
e9e2c950 | 598 | if (is_mhop) { |
6e01e275 | 599 | if ((BFD_TTL_VAL - bfd->mh_ttl) > BFD_TTL_VAL) { |
03e7f088 RZ |
600 | cp_debug(is_mhop, &peer, &local, port, vrfname, |
601 | "exceeded max hop count (expected %d, got %d)", | |
6e01e275 | 602 | bfd->mh_ttl, BFD_TTL_VAL); |
e9e2c950 RZ |
603 | return 0; |
604 | } | |
605 | } else if (bfd->local_ip.sa_sin.sin_family == AF_UNSPEC) { | |
606 | bfd->local_ip = local; | |
607 | } | |
608 | ||
609 | /* | |
610 | * If no interface was detected, save the interface where the | |
611 | * packet came in. | |
612 | */ | |
613 | if (bfd->ifindex == 0) | |
614 | bfd->ifindex = ptm_bfd_fetch_ifindex(port); | |
615 | ||
03e7f088 | 616 | /* Log remote discriminator changes. */ |
e9e2c950 | 617 | if ((bfd->discrs.remote_discr != 0) |
03e7f088 RZ |
618 | && (bfd->discrs.remote_discr != ntohl(cp->discrs.my_discr))) |
619 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
620 | "remote discriminator mismatch (expected %d, got %d)", | |
621 | bfd->discrs.remote_discr, ntohl(cp->discrs.my_discr)); | |
e9e2c950 RZ |
622 | |
623 | bfd->discrs.remote_discr = ntohl(cp->discrs.my_discr); | |
624 | ||
625 | /* If received the Final bit, the new values should take effect */ | |
626 | if (bfd->polling && BFD_GETFBIT(cp->flags)) { | |
627 | bfd->timers.desired_min_tx = bfd->new_timers.desired_min_tx; | |
628 | bfd->timers.required_min_rx = bfd->new_timers.required_min_rx; | |
629 | bfd->new_timers.desired_min_tx = 0; | |
630 | bfd->new_timers.required_min_rx = 0; | |
631 | bfd->polling = 0; | |
632 | } | |
633 | ||
634 | if (!bfd->demand_mode) { | |
635 | /* Compute detect time */ | |
636 | bfd->detect_TO = cp->detect_mult | |
637 | * ((bfd->timers.required_min_rx | |
638 | > ntohl(cp->timers.desired_min_tx)) | |
639 | ? bfd->timers.required_min_rx | |
640 | : ntohl(cp->timers.desired_min_tx)); | |
641 | bfd->remote_detect_mult = cp->detect_mult; | |
03e7f088 RZ |
642 | } else |
643 | cp_debug(is_mhop, &peer, &local, port, vrfname, | |
644 | "unsupported demand mode"); | |
e9e2c950 RZ |
645 | |
646 | /* Save remote diagnostics before state switch. */ | |
647 | bfd->remote_diag = cp->diag & BFD_DIAGMASK; | |
648 | ||
649 | /* State switch from section 6.8.6 */ | |
e9e2c950 RZ |
650 | if (BFD_GETSTATE(cp->flags) == PTM_BFD_ADM_DOWN) { |
651 | if (bfd->ses_state != PTM_BFD_DOWN) | |
40675ea9 | 652 | ptm_bfd_ses_dn(bfd, BD_NEIGHBOR_DOWN); |
e9e2c950 RZ |
653 | } else { |
654 | switch (bfd->ses_state) { | |
655 | case (PTM_BFD_DOWN): | |
656 | if (BFD_GETSTATE(cp->flags) == PTM_BFD_INIT) | |
657 | ptm_bfd_ses_up(bfd); | |
658 | else if (BFD_GETSTATE(cp->flags) == PTM_BFD_DOWN) | |
659 | bfd->ses_state = PTM_BFD_INIT; | |
660 | break; | |
661 | case (PTM_BFD_INIT): | |
662 | if (BFD_GETSTATE(cp->flags) == PTM_BFD_INIT | |
663 | || BFD_GETSTATE(cp->flags) == PTM_BFD_UP) | |
664 | ptm_bfd_ses_up(bfd); | |
665 | break; | |
666 | case (PTM_BFD_UP): | |
667 | if (BFD_GETSTATE(cp->flags) == PTM_BFD_DOWN) | |
40675ea9 | 668 | ptm_bfd_ses_dn(bfd, BD_NEIGHBOR_DOWN); |
e9e2c950 RZ |
669 | break; |
670 | } | |
671 | } | |
672 | ||
03e7f088 RZ |
673 | /* |
674 | * Handle echo packet status: | |
675 | * - Start echo packets if configured and permitted | |
676 | * (required_min_echo > 0); | |
677 | * - Stop echo packets if not allowed (required_min_echo == 0); | |
678 | * - Recalculate echo packet interval; | |
679 | */ | |
e9e2c950 RZ |
680 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO)) { |
681 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) { | |
682 | if (!ntohl(cp->timers.required_min_echo)) { | |
683 | ptm_bfd_echo_stop(bfd, 1); | |
684 | } else { | |
685 | oldEchoXmt_TO = bfd->echo_xmt_TO; | |
686 | bfd->echo_xmt_TO = | |
687 | bfd->timers.required_min_echo; | |
688 | if (ntohl(cp->timers.required_min_echo) | |
689 | > bfd->echo_xmt_TO) | |
690 | bfd->echo_xmt_TO = ntohl( | |
691 | cp->timers.required_min_echo); | |
692 | if (oldEchoXmt_TO != bfd->echo_xmt_TO) | |
693 | ptm_bfd_echo_start(bfd); | |
694 | } | |
695 | } else if (ntohl(cp->timers.required_min_echo)) { | |
696 | bfd->echo_xmt_TO = bfd->timers.required_min_echo; | |
697 | if (ntohl(cp->timers.required_min_echo) | |
698 | > bfd->echo_xmt_TO) | |
699 | bfd->echo_xmt_TO = | |
700 | ntohl(cp->timers.required_min_echo); | |
701 | ptm_bfd_echo_start(bfd); | |
702 | } | |
703 | } | |
704 | ||
705 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) { | |
706 | bfd->echo_xmt_TO = bfd->timers.required_min_echo; | |
707 | if (ntohl(cp->timers.required_min_echo) > bfd->echo_xmt_TO) | |
708 | bfd->echo_xmt_TO = ntohl(cp->timers.required_min_echo); | |
709 | } | |
710 | ||
711 | /* Calculate new transmit time */ | |
712 | oldXmtTime = bfd->xmt_TO; | |
713 | bfd->xmt_TO = | |
714 | (bfd->timers.desired_min_tx > ntohl(cp->timers.required_min_rx)) | |
715 | ? bfd->timers.desired_min_tx | |
716 | : ntohl(cp->timers.required_min_rx); | |
717 | ||
718 | /* If transmit time has changed, and too much time until next xmt, | |
719 | * restart | |
720 | */ | |
721 | if (BFD_GETPBIT(cp->flags)) { | |
722 | ptm_bfd_xmt_TO(bfd, 1); | |
723 | } else if (oldXmtTime != bfd->xmt_TO) { | |
724 | /* XXX add some skid to this as well */ | |
725 | ptm_bfd_start_xmt_timer(bfd, false); | |
726 | } | |
727 | ||
03e7f088 RZ |
728 | /* Restart detection timer (packet received) */ |
729 | if (!bfd->demand_mode) | |
e9e2c950 | 730 | bfd_recvtimer_update(bfd); |
e9e2c950 RZ |
731 | |
732 | /* | |
733 | * Save the timers and state sent by the remote end | |
734 | * for debugging and statistics. | |
735 | */ | |
736 | if (BFD_GETFBIT(cp->flags)) { | |
737 | bfd->remote_timers.desired_min_tx = | |
738 | ntohl(cp->timers.desired_min_tx); | |
739 | bfd->remote_timers.required_min_rx = | |
740 | ntohl(cp->timers.required_min_rx); | |
741 | bfd->remote_timers.required_min_echo = | |
742 | ntohl(cp->timers.required_min_echo); | |
743 | ||
744 | control_notify_config(BCM_NOTIFY_CONFIG_UPDATE, bfd); | |
745 | } | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
2f11c53f RZ |
750 | /* |
751 | * bp_bfd_echo_in: proccesses an BFD echo packet. On TTL == BFD_TTL_VAL | |
752 | * the packet is looped back or returns the my discriminator ID along | |
753 | * with the TTL. | |
754 | * | |
755 | * Returns -1 on error or loopback or 0 on success. | |
756 | */ | |
757 | int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr) | |
758 | { | |
759 | struct bfd_echo_pkt *bep; | |
760 | ssize_t rlen; | |
761 | struct sockaddr_any local, peer; | |
762 | char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1]; | |
763 | uint8_t msgbuf[1516]; | |
764 | ||
765 | if (sd == bglobal.bg_echo) | |
766 | rlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), ttl, port, | |
767 | sizeof(port), vrfname, sizeof(vrfname), | |
768 | &local, &peer); | |
769 | else | |
770 | rlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), ttl, port, | |
771 | sizeof(port), vrfname, sizeof(vrfname), | |
772 | &local, &peer); | |
773 | ||
774 | /* Short packet, better not risk reading it. */ | |
775 | if (rlen < (ssize_t)sizeof(*bep)) { | |
776 | cp_debug(false, &peer, &local, port, vrfname, | |
777 | "small echo packet"); | |
778 | return -1; | |
779 | } | |
780 | ||
781 | /* Test for loopback. */ | |
782 | if (*ttl == BFD_TTL_VAL) { | |
783 | bp_udp_send(sd, *ttl - 1, msgbuf, rlen, | |
784 | (struct sockaddr *)&peer, | |
785 | (sd == bglobal.bg_echo) ? sizeof(peer.sa_sin) | |
786 | : sizeof(peer.sa_sin6)); | |
787 | return -1; | |
788 | } | |
789 | ||
790 | /* Read my discriminator from BFD Echo packet. */ | |
791 | bep = (struct bfd_echo_pkt *)msgbuf; | |
792 | *my_discr = ntohl(bep->my_discr); | |
793 | if (*my_discr == 0) { | |
794 | cp_debug(false, &peer, &local, port, vrfname, | |
795 | "invalid echo packet discriminator (zero)"); | |
796 | return -1; | |
797 | } | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen, | |
803 | struct sockaddr *to, socklen_t tolen) | |
804 | { | |
805 | struct cmsghdr *cmsg; | |
806 | ssize_t wlen; | |
807 | int ttlval = ttl; | |
808 | bool is_ipv6 = to->sa_family == AF_INET6; | |
809 | struct msghdr msg; | |
810 | struct iovec iov[1]; | |
811 | uint8_t msgctl[255]; | |
812 | ||
813 | /* Prepare message data. */ | |
814 | iov[0].iov_base = data; | |
815 | iov[0].iov_len = datalen; | |
816 | ||
817 | memset(&msg, 0, sizeof(msg)); | |
818 | memset(msgctl, 0, sizeof(msgctl)); | |
819 | msg.msg_name = to; | |
820 | msg.msg_namelen = tolen; | |
821 | msg.msg_iov = iov; | |
822 | msg.msg_iovlen = 1; | |
823 | ||
824 | /* Prepare the packet TTL information. */ | |
825 | if (ttl > 0) { | |
826 | /* Use ancillary data. */ | |
827 | msg.msg_control = msgctl; | |
828 | msg.msg_controllen = CMSG_LEN(sizeof(ttlval)); | |
829 | ||
830 | /* Configure the ancillary data. */ | |
831 | cmsg = CMSG_FIRSTHDR(&msg); | |
832 | cmsg->cmsg_len = CMSG_LEN(sizeof(ttlval)); | |
833 | if (is_ipv6) { | |
834 | cmsg->cmsg_level = IPPROTO_IPV6; | |
835 | cmsg->cmsg_type = IPV6_HOPLIMIT; | |
836 | } else { | |
837 | #if BFD_LINUX | |
838 | cmsg->cmsg_level = IPPROTO_IP; | |
839 | cmsg->cmsg_type = IP_TTL; | |
840 | #else | |
841 | /* FreeBSD does not support TTL in ancillary data. */ | |
842 | msg.msg_control = NULL; | |
843 | msg.msg_controllen = 0; | |
844 | ||
845 | bp_set_ttl(sd, ttl); | |
846 | #endif /* BFD_BSD */ | |
847 | } | |
848 | memcpy(CMSG_DATA(cmsg), &ttlval, sizeof(ttlval)); | |
849 | } | |
850 | ||
851 | /* Send echo back. */ | |
852 | wlen = sendmsg(sd, &msg, 0); | |
853 | if (wlen <= 0) { | |
854 | log_debug("udp-send: loopback failure: (%d) %s", errno, strerror(errno)); | |
855 | return -1; | |
856 | } else if (wlen < (ssize_t)datalen) { | |
857 | log_debug("udp-send: partial send: %ld expected %ld", wlen, | |
858 | datalen); | |
859 | return -1; | |
860 | } | |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
e9e2c950 RZ |
865 | |
866 | /* | |
867 | * Sockets creation. | |
868 | */ | |
869 | ||
870 | ||
871 | /* | |
872 | * IPv4 sockets | |
873 | */ | |
6e01e275 | 874 | int bp_set_ttl(int sd, uint8_t value) |
e9e2c950 | 875 | { |
6e01e275 RZ |
876 | int ttl = value; |
877 | ||
878 | if (setsockopt(sd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) { | |
879 | log_warning("set-ttl: setsockopt(IP_TTL, %d): %s", value, | |
e9e2c950 RZ |
880 | strerror(errno)); |
881 | return -1; | |
882 | } | |
883 | ||
884 | return 0; | |
885 | } | |
886 | ||
6e01e275 | 887 | int bp_set_tos(int sd, uint8_t value) |
e9e2c950 | 888 | { |
6e01e275 RZ |
889 | int tos = value; |
890 | ||
891 | if (setsockopt(sd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) { | |
892 | log_warning("set-tos: setsockopt(IP_TOS, %d): %s", value, | |
e9e2c950 RZ |
893 | strerror(errno)); |
894 | return -1; | |
895 | } | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
900 | static void bp_set_ipopts(int sd) | |
901 | { | |
6e01e275 RZ |
902 | int rcvttl = BFD_RCV_TTL_VAL; |
903 | ||
904 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) | |
905 | log_fatal("set-ipopts: TTL configuration failed"); | |
e9e2c950 RZ |
906 | |
907 | if (setsockopt(sd, IPPROTO_IP, IP_RECVTTL, &rcvttl, sizeof(rcvttl)) | |
908 | == -1) | |
6e01e275 | 909 | log_fatal("set-ipopts: setsockopt(IP_RECVTTL, %d): %s", rcvttl, |
e9e2c950 RZ |
910 | strerror(errno)); |
911 | ||
912 | #ifdef BFD_LINUX | |
913 | int pktinfo = BFD_PKT_INFO_VAL; | |
6e01e275 | 914 | |
e9e2c950 RZ |
915 | /* Figure out address and interface to do the peer matching. */ |
916 | if (setsockopt(sd, IPPROTO_IP, IP_PKTINFO, &pktinfo, sizeof(pktinfo)) | |
917 | == -1) | |
6e01e275 | 918 | log_fatal("set-ipopts: setsockopt(IP_PKTINFO, %d): %s", pktinfo, |
e9e2c950 RZ |
919 | strerror(errno)); |
920 | #endif /* BFD_LINUX */ | |
921 | #ifdef BFD_BSD | |
922 | int yes = 1; | |
923 | ||
924 | /* Find out our address for peer matching. */ | |
925 | if (setsockopt(sd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) == -1) | |
6e01e275 | 926 | log_fatal("set-ipopts: setsockopt(IP_RECVDSTADDR, %d): %s", yes, |
e9e2c950 RZ |
927 | strerror(errno)); |
928 | ||
929 | /* Find out interface where the packet came in. */ | |
930 | if (setsockopt_ifindex(AF_INET, sd, yes) == -1) | |
6e01e275 | 931 | log_fatal("set-ipopts: setsockopt_ipv4_ifindex(%d): %s", yes, |
e9e2c950 RZ |
932 | strerror(errno)); |
933 | #endif /* BFD_BSD */ | |
934 | } | |
935 | ||
936 | static void bp_bind_ip(int sd, uint16_t port) | |
937 | { | |
938 | struct sockaddr_in sin; | |
939 | ||
940 | memset(&sin, 0, sizeof(sin)); | |
941 | sin.sin_family = AF_INET; | |
942 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
943 | sin.sin_port = htons(port); | |
944 | if (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1) | |
6e01e275 | 945 | log_fatal("bind-ip: bind: %s", strerror(errno)); |
e9e2c950 RZ |
946 | } |
947 | ||
948 | int bp_udp_shop(void) | |
949 | { | |
950 | int sd; | |
951 | ||
952 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
953 | if (sd == -1) | |
6e01e275 | 954 | log_fatal("udp-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
955 | |
956 | bp_set_ipopts(sd); | |
957 | bp_bind_ip(sd, BFD_DEFDESTPORT); | |
958 | ||
959 | return sd; | |
960 | } | |
961 | ||
962 | int bp_udp_mhop(void) | |
963 | { | |
964 | int sd; | |
965 | ||
966 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
967 | if (sd == -1) | |
6e01e275 | 968 | log_fatal("udp-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
969 | |
970 | bp_set_ipopts(sd); | |
971 | bp_bind_ip(sd, BFD_DEF_MHOP_DEST_PORT); | |
972 | ||
973 | return sd; | |
974 | } | |
975 | ||
976 | int bp_peer_socket(struct bfd_peer_cfg *bpc) | |
977 | { | |
978 | int sd, pcount; | |
979 | struct sockaddr_in sin; | |
980 | static int srcPort = BFD_SRCPORTINIT; | |
981 | ||
982 | sd = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
983 | if (sd == -1) { |
984 | log_error("ipv4-new: failed to create socket: %s", | |
985 | strerror(errno)); | |
e9e2c950 | 986 | return -1; |
03e7f088 | 987 | } |
e9e2c950 | 988 | |
8a9f760e RZ |
989 | /* Set TTL to 255 for all transmitted packets */ |
990 | if (bp_set_ttl(sd, BFD_TTL_VAL) != 0) { | |
991 | close(sd); | |
992 | return -1; | |
e9e2c950 RZ |
993 | } |
994 | ||
995 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 996 | if (bp_set_tos(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
997 | close(sd); |
998 | return -1; | |
999 | } | |
1000 | ||
8a9f760e | 1001 | if (bpc->bpc_has_localif) { |
e9e2c950 RZ |
1002 | if (bp_bind_dev(sd, bpc->bpc_localif) != 0) { |
1003 | close(sd); | |
1004 | return -1; | |
1005 | } | |
1006 | } else if (bpc->bpc_mhop && bpc->bpc_has_vrfname) { | |
1007 | if (bp_bind_dev(sd, bpc->bpc_vrfname) != 0) { | |
1008 | close(sd); | |
1009 | return -1; | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | /* Find an available source port in the proper range */ | |
1014 | memset(&sin, 0, sizeof(sin)); | |
1015 | sin = bpc->bpc_local.sa_sin; | |
1016 | sin.sin_family = AF_INET; | |
1017 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1018 | sin.sin_len = sizeof(sin); | |
1019 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
8a9f760e | 1020 | if (bpc->bpc_mhop) |
e9e2c950 RZ |
1021 | sin.sin_addr = bpc->bpc_local.sa_sin.sin_addr; |
1022 | else | |
1023 | sin.sin_addr.s_addr = INADDR_ANY; | |
1024 | ||
1025 | pcount = 0; | |
1026 | do { | |
1027 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
1028 | /* Searched all ports, none available */ | |
03e7f088 RZ |
1029 | log_error("ipv4-new: failed to bind port: %s", |
1030 | strerror(errno)); | |
e9e2c950 RZ |
1031 | close(sd); |
1032 | return -1; | |
1033 | } | |
1034 | if (srcPort >= BFD_SRCPORTMAX) | |
1035 | srcPort = BFD_SRCPORTINIT; | |
1036 | sin.sin_port = htons(srcPort++); | |
1037 | } while (bind(sd, (struct sockaddr *)&sin, sizeof(sin)) < 0); | |
1038 | ||
1039 | return sd; | |
1040 | } | |
1041 | ||
1042 | ||
1043 | /* | |
1044 | * IPv6 sockets | |
1045 | */ | |
1046 | ||
1047 | int bp_peer_socketv6(struct bfd_peer_cfg *bpc) | |
1048 | { | |
1049 | int sd, pcount, ifindex; | |
1050 | struct sockaddr_in6 sin6; | |
1051 | static int srcPort = BFD_SRCPORTINIT; | |
1052 | ||
1053 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
03e7f088 RZ |
1054 | if (sd == -1) { |
1055 | log_error("ipv6-new: failed to create socket: %s", | |
1056 | strerror(errno)); | |
e9e2c950 | 1057 | return -1; |
03e7f088 | 1058 | } |
e9e2c950 | 1059 | |
8a9f760e RZ |
1060 | /* Set TTL to 255 for all transmitted packets */ |
1061 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) != 0) { | |
1062 | close(sd); | |
1063 | return -1; | |
e9e2c950 RZ |
1064 | } |
1065 | ||
1066 | /* Set TOS to CS6 for all transmitted packets */ | |
6e01e275 | 1067 | if (bp_set_tosv6(sd, BFD_TOS_VAL) != 0) { |
e9e2c950 RZ |
1068 | close(sd); |
1069 | return -1; | |
1070 | } | |
1071 | ||
1072 | /* Find an available source port in the proper range */ | |
1073 | memset(&sin6, 0, sizeof(sin6)); | |
1074 | sin6.sin6_family = AF_INET6; | |
1075 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1076 | sin6.sin6_len = sizeof(sin6); | |
1077 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1078 | sin6 = bpc->bpc_local.sa_sin6; | |
43adc702 RZ |
1079 | ifindex = ptm_bfd_fetch_ifindex(bpc->bpc_localif); |
1080 | if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) | |
e9e2c950 | 1081 | sin6.sin6_scope_id = ifindex; |
e9e2c950 RZ |
1082 | |
1083 | if (bpc->bpc_has_localif) { | |
1084 | if (bp_bind_dev(sd, bpc->bpc_localif) != 0) { | |
1085 | close(sd); | |
1086 | return -1; | |
1087 | } | |
1088 | } else if (bpc->bpc_mhop && bpc->bpc_has_vrfname) { | |
1089 | if (bp_bind_dev(sd, bpc->bpc_vrfname) != 0) { | |
1090 | close(sd); | |
1091 | return -1; | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | pcount = 0; | |
1096 | do { | |
1097 | if ((++pcount) > (BFD_SRCPORTMAX - BFD_SRCPORTINIT)) { | |
1098 | /* Searched all ports, none available */ | |
03e7f088 RZ |
1099 | log_error("ipv6-new: failed to bind port: %s", |
1100 | strerror(errno)); | |
e9e2c950 RZ |
1101 | close(sd); |
1102 | return -1; | |
1103 | } | |
1104 | if (srcPort >= BFD_SRCPORTMAX) | |
1105 | srcPort = BFD_SRCPORTINIT; | |
1106 | sin6.sin6_port = htons(srcPort++); | |
1107 | } while (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) < 0); | |
1108 | ||
1109 | return sd; | |
1110 | } | |
1111 | ||
6e01e275 | 1112 | int bp_set_ttlv6(int sd, uint8_t value) |
e9e2c950 | 1113 | { |
6e01e275 RZ |
1114 | int ttl = value; |
1115 | ||
1116 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) | |
e9e2c950 | 1117 | == -1) { |
6e01e275 RZ |
1118 | log_warning("set-ttlv6: setsockopt(IPV6_UNICAST_HOPS, %d): %s", |
1119 | value, strerror(errno)); | |
e9e2c950 RZ |
1120 | return -1; |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
6e01e275 | 1126 | int bp_set_tosv6(int sd, uint8_t value) |
e9e2c950 | 1127 | { |
6e01e275 RZ |
1128 | int tos = value; |
1129 | ||
1130 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) | |
e9e2c950 | 1131 | == -1) { |
6e01e275 | 1132 | log_warning("set-tosv6: setsockopt(IPV6_TCLASS, %d): %s", value, |
e9e2c950 RZ |
1133 | strerror(errno)); |
1134 | return -1; | |
1135 | } | |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static void bp_set_ipv6opts(int sd) | |
1141 | { | |
6e01e275 RZ |
1142 | int ipv6_pktinfo = BFD_IPV6_PKT_INFO_VAL; |
1143 | int ipv6_only = BFD_IPV6_ONLY_VAL; | |
e9e2c950 | 1144 | |
6e01e275 RZ |
1145 | if (bp_set_ttlv6(sd, BFD_TTL_VAL) == -1) |
1146 | log_fatal("set-ipv6opts: setsockopt(IPV6_UNICAST_HOPS, %d): %s", | |
1147 | BFD_TTL_VAL, strerror(errno)); | |
e9e2c950 | 1148 | |
6e01e275 RZ |
1149 | if (setsockopt_ipv6_hoplimit(sd, BFD_RCV_TTL_VAL) == -1) |
1150 | log_fatal("set-ipv6opts: setsockopt(IPV6_HOPLIMIT, %d): %s", | |
1151 | BFD_RCV_TTL_VAL, strerror(errno)); | |
e9e2c950 RZ |
1152 | |
1153 | if (setsockopt_ipv6_pktinfo(sd, ipv6_pktinfo) == -1) | |
6e01e275 RZ |
1154 | log_fatal("set-ipv6opts: setsockopt(IPV6_PKTINFO, %d): %s", |
1155 | ipv6_pktinfo, strerror(errno)); | |
e9e2c950 RZ |
1156 | |
1157 | if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6_only, | |
1158 | sizeof(ipv6_only)) | |
1159 | == -1) | |
6e01e275 RZ |
1160 | log_fatal("set-ipv6opts: setsockopt(IPV6_V6ONLY, %d): %s", |
1161 | ipv6_only, strerror(errno)); | |
e9e2c950 RZ |
1162 | } |
1163 | ||
1164 | static void bp_bind_ipv6(int sd, uint16_t port) | |
1165 | { | |
1166 | struct sockaddr_in6 sin6; | |
1167 | ||
1168 | memset(&sin6, 0, sizeof(sin6)); | |
1169 | sin6.sin6_family = AF_INET6; | |
1170 | sin6.sin6_addr = in6addr_any; | |
1171 | sin6.sin6_port = htons(port); | |
1172 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1173 | sin6.sin6_len = sizeof(sin6); | |
1174 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1175 | if (bind(sd, (struct sockaddr *)&sin6, sizeof(sin6)) == -1) | |
6e01e275 | 1176 | log_fatal("bind-ipv6: bind: %s", strerror(errno)); |
e9e2c950 RZ |
1177 | } |
1178 | ||
1179 | int bp_udp6_shop(void) | |
1180 | { | |
1181 | int sd; | |
1182 | ||
1183 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1184 | if (sd == -1) | |
6e01e275 | 1185 | log_fatal("udp6-shop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1186 | |
1187 | bp_set_ipv6opts(sd); | |
1188 | bp_bind_ipv6(sd, BFD_DEFDESTPORT); | |
1189 | ||
1190 | return sd; | |
1191 | } | |
1192 | ||
1193 | int bp_udp6_mhop(void) | |
1194 | { | |
1195 | int sd; | |
1196 | ||
1197 | sd = socket(AF_INET6, SOCK_DGRAM, PF_UNSPEC); | |
1198 | if (sd == -1) | |
6e01e275 | 1199 | log_fatal("udp6-mhop: socket: %s", strerror(errno)); |
e9e2c950 RZ |
1200 | |
1201 | bp_set_ipv6opts(sd); | |
1202 | bp_bind_ipv6(sd, BFD_DEF_MHOP_DEST_PORT); | |
1203 | ||
1204 | return sd; | |
1205 | } | |
2f11c53f RZ |
1206 | |
1207 | int bp_echo_socket(void) | |
1208 | { | |
1209 | int s; | |
1210 | ||
1211 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
1212 | if (s == -1) | |
1213 | log_fatal("echo-socket: socket: %s", strerror(errno)); | |
1214 | ||
1215 | bp_set_ipopts(s); | |
1216 | bp_bind_ip(s, BFD_DEF_ECHO_PORT); | |
1217 | ||
1218 | return s; | |
1219 | } | |
1220 | ||
1221 | int bp_echov6_socket(void) | |
1222 | { | |
1223 | int s; | |
1224 | ||
1225 | s = socket(AF_INET6, SOCK_DGRAM, 0); | |
1226 | if (s == -1) | |
1227 | log_fatal("echov6-socket: socket: %s", strerror(errno)); | |
1228 | ||
1229 | bp_set_ipv6opts(s); | |
1230 | bp_bind_ipv6(s, BFD_DEF_ECHO_PORT); | |
1231 | ||
1232 | return s; | |
1233 | } |