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8429abe0 RW |
1 | /* $OpenBSD$ */ |
2 | ||
3 | /* | |
4 | * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org> | |
5 | * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org> | |
6 | * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org> | |
7 | * | |
8 | * Permission to use, copy, modify, and distribute this software for any | |
9 | * purpose with or without fee is hereby granted, provided that the above | |
10 | * copyright notice and this permission notice appear in all copies. | |
11 | * | |
12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
13 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
14 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
15 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
16 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
17 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
18 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
19 | */ | |
20 | ||
eac6e3f0 | 21 | #include <zebra.h> |
8429abe0 RW |
22 | |
23 | #include "ldpd.h" | |
24 | #include "ldpe.h" | |
25 | #include "log.h" | |
26 | ||
eac6e3f0 RW |
27 | #include "sockopt.h" |
28 | ||
8429abe0 | 29 | static struct iface *disc_find_iface(unsigned int, int, |
097e36bf | 30 | union ldpd_addr *); |
cc9f21da DS |
31 | static void session_read(struct thread *thread); |
32 | static void session_write(struct thread *thread); | |
8429abe0 RW |
33 | static ssize_t session_get_pdu(struct ibuf_read *, char **); |
34 | static void tcp_close(struct tcp_conn *); | |
35 | static struct pending_conn *pending_conn_new(int, int, union ldpd_addr *); | |
cc9f21da | 36 | static void pending_conn_timeout(struct thread *thread); |
8429abe0 RW |
37 | |
38 | int | |
39 | gen_ldp_hdr(struct ibuf *buf, uint16_t size) | |
40 | { | |
41 | struct ldp_hdr ldp_hdr; | |
42 | ||
43 | memset(&ldp_hdr, 0, sizeof(ldp_hdr)); | |
44 | ldp_hdr.version = htons(LDP_VERSION); | |
45 | /* exclude the 'Version' and 'PDU Length' fields from the total */ | |
46 | ldp_hdr.length = htons(size - LDP_HDR_DEAD_LEN); | |
eac6e3f0 | 47 | ldp_hdr.lsr_id = ldp_rtr_id_get(leconf); |
8429abe0 RW |
48 | ldp_hdr.lspace_id = 0; |
49 | ||
50 | return (ibuf_add(buf, &ldp_hdr, LDP_HDR_SIZE)); | |
51 | } | |
52 | ||
53 | int | |
54 | gen_msg_hdr(struct ibuf *buf, uint16_t type, uint16_t size) | |
55 | { | |
56 | static int msgcnt = 0; | |
57 | struct ldp_msg msg; | |
58 | ||
59 | memset(&msg, 0, sizeof(msg)); | |
60 | msg.type = htons(type); | |
61 | /* exclude the 'Type' and 'Length' fields from the total */ | |
62 | msg.length = htons(size - LDP_MSG_DEAD_LEN); | |
63 | msg.id = htonl(++msgcnt); | |
64 | ||
65 | return (ibuf_add(buf, &msg, sizeof(msg))); | |
66 | } | |
67 | ||
68 | /* send packets */ | |
69 | int | |
70 | send_packet(int fd, int af, union ldpd_addr *dst, struct iface_af *ia, | |
71 | void *pkt, size_t len) | |
72 | { | |
4149ef7c | 73 | union sockunion su; |
8429abe0 RW |
74 | |
75 | switch (af) { | |
76 | case AF_INET: | |
77 | if (ia && IN_MULTICAST(ntohl(dst->v4.s_addr))) { | |
78 | /* set outgoing interface for multicast traffic */ | |
79 | if (sock_set_ipv4_mcast(ia->iface) == -1) { | |
3efd0893 | 80 | log_debug("%s: error setting multicast interface, %s", __func__, ia->iface->name); |
8429abe0 RW |
81 | return (-1); |
82 | } | |
83 | } | |
84 | break; | |
85 | case AF_INET6: | |
86 | if (ia && IN6_IS_ADDR_MULTICAST(&dst->v6)) { | |
87 | /* set outgoing interface for multicast traffic */ | |
88 | if (sock_set_ipv6_mcast(ia->iface) == -1) { | |
3efd0893 | 89 | log_debug("%s: error setting multicast interface, %s", __func__, ia->iface->name); |
8429abe0 RW |
90 | return (-1); |
91 | } | |
92 | } | |
93 | break; | |
94 | default: | |
95 | fatalx("send_packet: unknown af"); | |
96 | } | |
97 | ||
4149ef7c A |
98 | addr2sa(af, dst, LDP_PORT, &su); |
99 | if (sendto(fd, pkt, len, 0, &su.sa, sockaddr_len(&su.sa)) == -1) { | |
8429abe0 | 100 | log_warn("%s: error sending packet to %s", __func__, |
4149ef7c | 101 | log_sockaddr(&su.sa)); |
8429abe0 RW |
102 | return (-1); |
103 | } | |
104 | ||
105 | return (0); | |
106 | } | |
107 | ||
108 | /* Discovery functions */ | |
cc9f21da | 109 | void disc_recv_packet(struct thread *thread) |
8429abe0 | 110 | { |
eac6e3f0 RW |
111 | int fd = THREAD_FD(thread); |
112 | struct thread **threadp = THREAD_ARG(thread); | |
113 | ||
8429abe0 RW |
114 | union { |
115 | struct cmsghdr hdr; | |
eac6e3f0 RW |
116 | #ifdef HAVE_STRUCT_SOCKADDR_DL |
117 | char buf[CMSG_SPACE(sizeof(struct sockaddr_dl))]; | |
118 | #else | |
119 | char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
120 | #endif | |
8429abe0 RW |
121 | } cmsgbuf; |
122 | struct msghdr m; | |
123 | struct sockaddr_storage from; | |
124 | struct iovec iov; | |
125 | char *buf; | |
eac6e3f0 | 126 | #ifndef MSG_MCAST |
8429abe0 | 127 | struct cmsghdr *cmsg; |
eac6e3f0 | 128 | #endif |
8429abe0 RW |
129 | ssize_t r; |
130 | int multicast; | |
131 | int af; | |
132 | union ldpd_addr src; | |
133 | unsigned int ifindex = 0; | |
097e36bf | 134 | struct iface *iface = NULL; |
8429abe0 RW |
135 | uint16_t len; |
136 | struct ldp_hdr ldp_hdr; | |
137 | uint16_t pdu_len; | |
138 | struct ldp_msg msg; | |
139 | uint16_t msg_len; | |
140 | struct in_addr lsr_id; | |
141 | ||
eac6e3f0 | 142 | /* reschedule read */ |
e83c042a | 143 | thread_add_read(master, disc_recv_packet, threadp, fd, threadp); |
8429abe0 RW |
144 | |
145 | /* setup buffer */ | |
146 | memset(&m, 0, sizeof(m)); | |
147 | iov.iov_base = buf = pkt_ptr; | |
148 | iov.iov_len = IBUF_READ_SIZE; | |
149 | m.msg_name = &from; | |
150 | m.msg_namelen = sizeof(from); | |
151 | m.msg_iov = &iov; | |
152 | m.msg_iovlen = 1; | |
153 | m.msg_control = &cmsgbuf.buf; | |
154 | m.msg_controllen = sizeof(cmsgbuf.buf); | |
155 | ||
156 | if ((r = recvmsg(fd, &m, 0)) == -1) { | |
157 | if (errno != EAGAIN && errno != EINTR) | |
158 | log_debug("%s: read error: %s", __func__, | |
159 | strerror(errno)); | |
cc9f21da | 160 | return; |
8429abe0 RW |
161 | } |
162 | ||
eac6e3f0 RW |
163 | sa2addr((struct sockaddr *)&from, &af, &src, NULL); |
164 | #ifdef MSG_MCAST | |
8429abe0 | 165 | multicast = (m.msg_flags & MSG_MCAST) ? 1 : 0; |
eac6e3f0 RW |
166 | #else |
167 | multicast = 0; | |
8429abe0 RW |
168 | for (cmsg = CMSG_FIRSTHDR(&m); cmsg != NULL; |
169 | cmsg = CMSG_NXTHDR(&m, cmsg)) { | |
eac6e3f0 RW |
170 | #if defined(HAVE_IP_PKTINFO) |
171 | if (af == AF_INET && cmsg->cmsg_level == IPPROTO_IP && | |
172 | cmsg->cmsg_type == IP_PKTINFO) { | |
173 | struct in_pktinfo *pktinfo; | |
174 | ||
175 | pktinfo = (struct in_pktinfo *)CMSG_DATA(cmsg); | |
176 | if (IN_MULTICAST(ntohl(pktinfo->ipi_addr.s_addr))) | |
177 | multicast = 1; | |
178 | break; | |
179 | } | |
180 | #elif defined(HAVE_IP_RECVDSTADDR) | |
8429abe0 | 181 | if (af == AF_INET && cmsg->cmsg_level == IPPROTO_IP && |
eac6e3f0 RW |
182 | cmsg->cmsg_type == IP_RECVDSTADDR) { |
183 | struct in_addr *addr; | |
184 | ||
185 | addr = (struct in_addr *)CMSG_DATA(cmsg); | |
186 | if (IN_MULTICAST(ntohl(addr->s_addr))) | |
187 | multicast = 1; | |
8429abe0 RW |
188 | break; |
189 | } | |
eac6e3f0 RW |
190 | #else |
191 | #error "Unsupported socket API" | |
192 | #endif | |
8429abe0 RW |
193 | if (af == AF_INET6 && cmsg->cmsg_level == IPPROTO_IPV6 && |
194 | cmsg->cmsg_type == IPV6_PKTINFO) { | |
eac6e3f0 RW |
195 | struct in6_pktinfo *pktinfo; |
196 | ||
197 | pktinfo = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
198 | if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr)) | |
199 | multicast = 1; | |
8429abe0 RW |
200 | break; |
201 | } | |
202 | } | |
eac6e3f0 RW |
203 | #endif /* MSG_MCAST */ |
204 | if (bad_addr(af, &src)) { | |
205 | log_debug("%s: invalid source address: %s", __func__, | |
206 | log_addr(af, &src)); | |
cc9f21da | 207 | return; |
eac6e3f0 RW |
208 | } |
209 | ifindex = getsockopt_ifindex(af, &m); | |
8429abe0 RW |
210 | |
211 | /* find a matching interface */ | |
097e36bf RW |
212 | if (multicast) { |
213 | iface = disc_find_iface(ifindex, af, &src); | |
214 | if (iface == NULL) | |
cc9f21da | 215 | return; |
097e36bf | 216 | } |
8429abe0 RW |
217 | |
218 | /* check packet size */ | |
219 | len = (uint16_t)r; | |
220 | if (len < (LDP_HDR_SIZE + LDP_MSG_SIZE) || len > LDP_MAX_LEN) { | |
221 | log_debug("%s: bad packet size, source %s", __func__, | |
222 | log_addr(af, &src)); | |
cc9f21da | 223 | return; |
8429abe0 RW |
224 | } |
225 | ||
226 | /* LDP header sanity checks */ | |
227 | memcpy(&ldp_hdr, buf, sizeof(ldp_hdr)); | |
228 | if (ntohs(ldp_hdr.version) != LDP_VERSION) { | |
229 | log_debug("%s: invalid LDP version %d, source %s", __func__, | |
230 | ntohs(ldp_hdr.version), log_addr(af, &src)); | |
cc9f21da | 231 | return; |
8429abe0 RW |
232 | } |
233 | if (ntohs(ldp_hdr.lspace_id) != 0) { | |
234 | log_debug("%s: invalid label space %u, source %s", __func__, | |
235 | ntohs(ldp_hdr.lspace_id), log_addr(af, &src)); | |
cc9f21da | 236 | return; |
8429abe0 RW |
237 | } |
238 | /* check "PDU Length" field */ | |
239 | pdu_len = ntohs(ldp_hdr.length); | |
240 | if ((pdu_len < (LDP_HDR_PDU_LEN + LDP_MSG_SIZE)) || | |
241 | (pdu_len > (len - LDP_HDR_DEAD_LEN))) { | |
242 | log_debug("%s: invalid LDP packet length %u, source %s", | |
243 | __func__, ntohs(ldp_hdr.length), log_addr(af, &src)); | |
cc9f21da | 244 | return; |
8429abe0 RW |
245 | } |
246 | buf += LDP_HDR_SIZE; | |
247 | len -= LDP_HDR_SIZE; | |
248 | ||
249 | lsr_id.s_addr = ldp_hdr.lsr_id; | |
250 | ||
251 | /* | |
252 | * For UDP, we process only the first message of each packet. This does | |
253 | * not impose any restrictions since LDP uses UDP only for sending Hello | |
254 | * packets. | |
255 | */ | |
256 | memcpy(&msg, buf, sizeof(msg)); | |
257 | ||
258 | /* check "Message Length" field */ | |
259 | msg_len = ntohs(msg.length); | |
260 | if (msg_len < LDP_MSG_LEN || ((msg_len + LDP_MSG_DEAD_LEN) > pdu_len)) { | |
261 | log_debug("%s: invalid LDP message length %u, source %s", | |
262 | __func__, ntohs(msg.length), log_addr(af, &src)); | |
cc9f21da | 263 | return; |
8429abe0 RW |
264 | } |
265 | buf += LDP_MSG_SIZE; | |
266 | len -= LDP_MSG_SIZE; | |
267 | ||
268 | /* switch LDP packet type */ | |
269 | switch (ntohs(msg.type)) { | |
270 | case MSG_TYPE_HELLO: | |
271 | recv_hello(lsr_id, &msg, af, &src, iface, multicast, buf, len); | |
272 | break; | |
273 | default: | |
274 | log_debug("%s: unknown LDP packet type, source %s", __func__, | |
275 | log_addr(af, &src)); | |
276 | } | |
277 | } | |
278 | ||
279 | static struct iface * | |
097e36bf | 280 | disc_find_iface(unsigned int ifindex, int af, union ldpd_addr *src) |
8429abe0 RW |
281 | { |
282 | struct iface *iface; | |
283 | struct iface_af *ia; | |
8429abe0 RW |
284 | |
285 | iface = if_lookup(leconf, ifindex); | |
286 | if (iface == NULL) | |
287 | return (NULL); | |
288 | ||
4913a168 RW |
289 | ia = iface_af_get(iface, af); |
290 | if (!ia->enabled) | |
291 | return (NULL); | |
292 | ||
8429abe0 | 293 | /* |
e885fc27 RW |
294 | * RFC 7552 - Section 5.1: |
295 | * "Link-local IPv6 address MUST be used as the source IP address in | |
296 | * IPv6 LDP Link Hellos". | |
8429abe0 | 297 | */ |
097e36bf | 298 | if (af == AF_INET6 && !IN6_IS_ADDR_LINKLOCAL(&src->v6)) |
e885fc27 | 299 | return (NULL); |
8429abe0 | 300 | |
e885fc27 | 301 | return (iface); |
8429abe0 RW |
302 | } |
303 | ||
cc9f21da | 304 | void session_accept(struct thread *thread) |
8429abe0 | 305 | { |
eac6e3f0 | 306 | int fd = THREAD_FD(thread); |
8429abe0 RW |
307 | struct sockaddr_storage src; |
308 | socklen_t len = sizeof(src); | |
309 | int newfd; | |
310 | int af; | |
311 | union ldpd_addr addr; | |
312 | struct nbr *nbr; | |
313 | struct pending_conn *pconn; | |
314 | ||
eac6e3f0 | 315 | newfd = accept(fd, (struct sockaddr *)&src, &len); |
8429abe0 RW |
316 | if (newfd == -1) { |
317 | /* | |
318 | * Pause accept if we are out of file descriptors, or | |
319 | * libevent will haunt us here too. | |
320 | */ | |
321 | if (errno == ENFILE || errno == EMFILE) { | |
322 | accept_pause(); | |
323 | } else if (errno != EWOULDBLOCK && errno != EINTR && | |
324 | errno != ECONNABORTED) | |
325 | log_debug("%s: accept error: %s", __func__, | |
326 | strerror(errno)); | |
cc9f21da | 327 | return; |
8429abe0 | 328 | } |
eac6e3f0 | 329 | sock_set_nonblock(newfd); |
8429abe0 | 330 | |
eac6e3f0 | 331 | sa2addr((struct sockaddr *)&src, &af, &addr, NULL); |
8429abe0 RW |
332 | |
333 | /* | |
334 | * Since we don't support label spaces, we can identify this neighbor | |
335 | * just by its source address. This way we don't need to wait for its | |
336 | * Initialization message to know who we are talking to. | |
337 | */ | |
338 | nbr = nbr_find_addr(af, &addr); | |
339 | if (nbr == NULL) { | |
340 | /* | |
341 | * According to RFC 5036, we would need to send a No Hello | |
342 | * Error Notification message and close this TCP connection | |
343 | * right now. But doing so would trigger the backoff exponential | |
344 | * timer in the remote peer, which would considerably slow down | |
345 | * the session establishment process. The trick here is to wait | |
346 | * five seconds before sending the Notification Message. There's | |
347 | * a good chance that the remote peer will send us a Hello | |
348 | * message within this interval, so it's worth waiting before | |
349 | * taking a more drastic measure. | |
350 | */ | |
351 | pconn = pending_conn_find(af, &addr); | |
352 | if (pconn) | |
353 | close(newfd); | |
354 | else | |
355 | pending_conn_new(newfd, af, &addr); | |
cc9f21da | 356 | return; |
8429abe0 RW |
357 | } |
358 | /* protection against buggy implementations */ | |
359 | if (nbr_session_active_role(nbr)) { | |
360 | close(newfd); | |
cc9f21da | 361 | return; |
8429abe0 RW |
362 | } |
363 | if (nbr->state != NBR_STA_PRESENT) { | |
903a7226 | 364 | log_debug("%s: lsr-id %pI4: rejecting additional transport connection", __func__, &nbr->id); |
8429abe0 | 365 | close(newfd); |
cc9f21da | 366 | return; |
8429abe0 RW |
367 | } |
368 | ||
369 | session_accept_nbr(nbr, newfd); | |
370 | } | |
371 | ||
372 | void | |
373 | session_accept_nbr(struct nbr *nbr, int fd) | |
374 | { | |
eac6e3f0 | 375 | #ifdef __OpenBSD__ |
8429abe0 RW |
376 | struct nbr_params *nbrp; |
377 | int opt; | |
378 | socklen_t len; | |
379 | ||
380 | nbrp = nbr_params_find(leconf, nbr->id); | |
381 | if (nbr_gtsm_check(fd, nbr, nbrp)) { | |
382 | close(fd); | |
383 | return; | |
384 | } | |
385 | ||
386 | if (nbrp && nbrp->auth.method == AUTH_MD5SIG) { | |
387 | if (sysdep.no_pfkey || sysdep.no_md5sig) { | |
388 | log_warnx("md5sig configured but not available"); | |
389 | close(fd); | |
390 | return; | |
391 | } | |
392 | ||
393 | len = sizeof(opt); | |
394 | if (getsockopt(fd, IPPROTO_TCP, TCP_MD5SIG, &opt, &len) == -1) | |
395 | fatal("getsockopt TCP_MD5SIG"); | |
396 | if (!opt) { /* non-md5'd connection! */ | |
397 | log_warnx("connection attempt without md5 signature"); | |
398 | close(fd); | |
399 | return; | |
400 | } | |
401 | } | |
eac6e3f0 | 402 | #endif |
8429abe0 RW |
403 | |
404 | nbr->tcp = tcp_new(fd, nbr); | |
405 | nbr_fsm(nbr, NBR_EVT_MATCH_ADJ); | |
406 | } | |
407 | ||
cc9f21da | 408 | static void session_read(struct thread *thread) |
8429abe0 | 409 | { |
eac6e3f0 RW |
410 | int fd = THREAD_FD(thread); |
411 | struct nbr *nbr = THREAD_ARG(thread); | |
8429abe0 RW |
412 | struct tcp_conn *tcp = nbr->tcp; |
413 | struct ldp_hdr *ldp_hdr; | |
414 | struct ldp_msg *msg; | |
eac6e3f0 | 415 | char *buf = NULL, *pdu; |
8429abe0 RW |
416 | ssize_t n, len; |
417 | uint16_t pdu_len, msg_len, msg_size, max_pdu_len; | |
418 | int ret; | |
419 | ||
66e78ae6 | 420 | thread_add_read(master, session_read, nbr, fd, &tcp->rev); |
8429abe0 RW |
421 | |
422 | if ((n = read(fd, tcp->rbuf->buf + tcp->rbuf->wpos, | |
423 | sizeof(tcp->rbuf->buf) - tcp->rbuf->wpos)) == -1) { | |
424 | if (errno != EINTR && errno != EAGAIN) { | |
425 | log_warn("%s: read error", __func__); | |
426 | nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION); | |
cc9f21da | 427 | return; |
8429abe0 RW |
428 | } |
429 | /* retry read */ | |
cc9f21da | 430 | return; |
8429abe0 RW |
431 | } |
432 | if (n == 0) { | |
433 | /* connection closed */ | |
434 | log_debug("%s: connection closed by remote end", __func__); | |
435 | nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION); | |
cc9f21da | 436 | return; |
8429abe0 RW |
437 | } |
438 | tcp->rbuf->wpos += n; | |
439 | ||
440 | while ((len = session_get_pdu(tcp->rbuf, &buf)) > 0) { | |
441 | pdu = buf; | |
442 | ldp_hdr = (struct ldp_hdr *)pdu; | |
443 | if (ntohs(ldp_hdr->version) != LDP_VERSION) { | |
444 | session_shutdown(nbr, S_BAD_PROTO_VER, 0, 0); | |
445 | free(buf); | |
cc9f21da | 446 | return; |
8429abe0 RW |
447 | } |
448 | ||
449 | pdu_len = ntohs(ldp_hdr->length); | |
450 | /* | |
451 | * RFC 5036 - Section 3.5.3: | |
452 | * "Prior to completion of the negotiation, the maximum | |
453 | * allowable length is 4096 bytes". | |
454 | */ | |
455 | if (nbr->state == NBR_STA_OPER) | |
456 | max_pdu_len = nbr->max_pdu_len; | |
457 | else | |
458 | max_pdu_len = LDP_MAX_LEN; | |
459 | if (pdu_len < (LDP_HDR_PDU_LEN + LDP_MSG_SIZE) || | |
460 | pdu_len > max_pdu_len) { | |
461 | session_shutdown(nbr, S_BAD_PDU_LEN, 0, 0); | |
462 | free(buf); | |
cc9f21da | 463 | return; |
8429abe0 RW |
464 | } |
465 | pdu_len -= LDP_HDR_PDU_LEN; | |
466 | if (ldp_hdr->lsr_id != nbr->id.s_addr || | |
467 | ldp_hdr->lspace_id != 0) { | |
468 | session_shutdown(nbr, S_BAD_LDP_ID, 0, 0); | |
469 | free(buf); | |
cc9f21da | 470 | return; |
8429abe0 RW |
471 | } |
472 | pdu += LDP_HDR_SIZE; | |
473 | len -= LDP_HDR_SIZE; | |
474 | ||
475 | nbr_fsm(nbr, NBR_EVT_PDU_RCVD); | |
476 | ||
477 | while (len >= LDP_MSG_SIZE) { | |
478 | uint16_t type; | |
479 | ||
480 | msg = (struct ldp_msg *)pdu; | |
481 | type = ntohs(msg->type); | |
482 | msg_len = ntohs(msg->length); | |
483 | if (msg_len < LDP_MSG_LEN || | |
484 | (msg_len + LDP_MSG_DEAD_LEN) > pdu_len) { | |
a901e098 | 485 | session_shutdown(nbr, S_BAD_MSG_LEN, msg->id, |
8429abe0 RW |
486 | msg->type); |
487 | free(buf); | |
cc9f21da | 488 | return; |
8429abe0 RW |
489 | } |
490 | msg_size = msg_len + LDP_MSG_DEAD_LEN; | |
491 | pdu_len -= msg_size; | |
492 | ||
493 | /* check for error conditions earlier */ | |
494 | switch (type) { | |
495 | case MSG_TYPE_INIT: | |
496 | if ((nbr->state != NBR_STA_INITIAL) && | |
497 | (nbr->state != NBR_STA_OPENSENT)) { | |
498 | session_shutdown(nbr, S_SHUTDOWN, | |
499 | msg->id, msg->type); | |
500 | free(buf); | |
cc9f21da | 501 | return; |
8429abe0 RW |
502 | } |
503 | break; | |
504 | case MSG_TYPE_KEEPALIVE: | |
505 | if ((nbr->state == NBR_STA_INITIAL) || | |
506 | (nbr->state == NBR_STA_OPENSENT)) { | |
507 | session_shutdown(nbr, S_SHUTDOWN, | |
508 | msg->id, msg->type); | |
509 | free(buf); | |
cc9f21da | 510 | return; |
8429abe0 RW |
511 | } |
512 | break; | |
90989cb3 RW |
513 | case MSG_TYPE_NOTIFICATION: |
514 | break; | |
8819fc38 | 515 | default: |
8429abe0 RW |
516 | if (nbr->state != NBR_STA_OPER) { |
517 | session_shutdown(nbr, S_SHUTDOWN, | |
518 | msg->id, msg->type); | |
519 | free(buf); | |
cc9f21da | 520 | return; |
8429abe0 RW |
521 | } |
522 | break; | |
8429abe0 RW |
523 | } |
524 | ||
525 | /* switch LDP packet type */ | |
526 | switch (type) { | |
527 | case MSG_TYPE_NOTIFICATION: | |
528 | ret = recv_notification(nbr, pdu, msg_size); | |
529 | break; | |
530 | case MSG_TYPE_INIT: | |
531 | ret = recv_init(nbr, pdu, msg_size); | |
532 | break; | |
533 | case MSG_TYPE_KEEPALIVE: | |
534 | ret = recv_keepalive(nbr, pdu, msg_size); | |
535 | break; | |
8819fc38 RW |
536 | case MSG_TYPE_CAPABILITY: |
537 | ret = recv_capability(nbr, pdu, msg_size); | |
538 | break; | |
8429abe0 RW |
539 | case MSG_TYPE_ADDR: |
540 | case MSG_TYPE_ADDRWITHDRAW: | |
541 | ret = recv_address(nbr, pdu, msg_size); | |
542 | break; | |
543 | case MSG_TYPE_LABELMAPPING: | |
544 | case MSG_TYPE_LABELREQUEST: | |
545 | case MSG_TYPE_LABELWITHDRAW: | |
546 | case MSG_TYPE_LABELRELEASE: | |
547 | case MSG_TYPE_LABELABORTREQ: | |
548 | ret = recv_labelmessage(nbr, pdu, msg_size, | |
549 | type); | |
550 | break; | |
551 | default: | |
903a7226 MS |
552 | log_debug("%s: unknown LDP message from nbr %pI4", |
553 | __func__, &nbr->id); | |
d4d6e7d8 KS |
554 | if (!(ntohs(msg->type) & UNKNOWN_FLAG)) { |
555 | nbr->stats.unknown_msg++; | |
adbdf465 | 556 | send_notification(nbr->tcp, |
8429abe0 | 557 | S_UNKNOWN_MSG, msg->id, msg->type); |
d4d6e7d8 | 558 | } |
8429abe0 RW |
559 | /* ignore the message */ |
560 | ret = 0; | |
561 | break; | |
562 | } | |
563 | ||
564 | if (ret == -1) { | |
565 | /* parser failed, giving up */ | |
566 | free(buf); | |
cc9f21da | 567 | return; |
8429abe0 RW |
568 | } |
569 | ||
0f7b5df9 RW |
570 | /* no errors - update per neighbor message counters */ |
571 | switch (type) { | |
572 | case MSG_TYPE_NOTIFICATION: | |
573 | nbr->stats.notif_rcvd++; | |
574 | break; | |
575 | case MSG_TYPE_KEEPALIVE: | |
576 | nbr->stats.kalive_rcvd++; | |
577 | break; | |
578 | case MSG_TYPE_CAPABILITY: | |
579 | nbr->stats.capability_rcvd++; | |
580 | break; | |
581 | case MSG_TYPE_ADDR: | |
582 | nbr->stats.addr_rcvd++; | |
583 | break; | |
584 | case MSG_TYPE_ADDRWITHDRAW: | |
585 | nbr->stats.addrwdraw_rcvd++; | |
586 | break; | |
587 | case MSG_TYPE_LABELMAPPING: | |
588 | nbr->stats.labelmap_rcvd++; | |
589 | break; | |
590 | case MSG_TYPE_LABELREQUEST: | |
591 | nbr->stats.labelreq_rcvd++; | |
592 | break; | |
593 | case MSG_TYPE_LABELWITHDRAW: | |
594 | nbr->stats.labelwdraw_rcvd++; | |
595 | break; | |
596 | case MSG_TYPE_LABELRELEASE: | |
597 | nbr->stats.labelrel_rcvd++; | |
598 | break; | |
599 | case MSG_TYPE_LABELABORTREQ: | |
600 | nbr->stats.labelabreq_rcvd++; | |
601 | break; | |
602 | default: | |
603 | break; | |
604 | } | |
605 | ||
8429abe0 RW |
606 | /* Analyse the next message */ |
607 | pdu += msg_size; | |
608 | len -= msg_size; | |
609 | } | |
610 | free(buf); | |
bb53f1bc | 611 | buf = NULL; |
8429abe0 RW |
612 | if (len != 0) { |
613 | session_shutdown(nbr, S_BAD_PDU_LEN, 0, 0); | |
cc9f21da | 614 | return; |
8429abe0 RW |
615 | } |
616 | } | |
eac6e3f0 | 617 | |
bb53f1bc DL |
618 | /* shouldn't happen, session_get_pdu should be > 0 if buf was |
619 | * allocated - but let's get rid of the SA warning. | |
620 | */ | |
621 | free(buf); | |
8429abe0 RW |
622 | } |
623 | ||
cc9f21da | 624 | static void session_write(struct thread *thread) |
8429abe0 | 625 | { |
eac6e3f0 | 626 | struct tcp_conn *tcp = THREAD_ARG(thread); |
8429abe0 RW |
627 | struct nbr *nbr = tcp->nbr; |
628 | ||
eac6e3f0 | 629 | tcp->wbuf.ev = NULL; |
8429abe0 RW |
630 | |
631 | if (msgbuf_write(&tcp->wbuf.wbuf) <= 0) | |
632 | if (errno != EAGAIN && nbr) | |
633 | nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION); | |
634 | ||
635 | if (nbr == NULL && !tcp->wbuf.wbuf.queued) { | |
636 | /* | |
637 | * We are done sending the notification message, now we can | |
638 | * close the socket. | |
639 | */ | |
640 | tcp_close(tcp); | |
cc9f21da | 641 | return; |
8429abe0 RW |
642 | } |
643 | ||
644 | evbuf_event_add(&tcp->wbuf); | |
645 | } | |
646 | ||
647 | void | |
648 | session_shutdown(struct nbr *nbr, uint32_t status, uint32_t msg_id, | |
649 | uint32_t msg_type) | |
650 | { | |
651 | switch (nbr->state) { | |
652 | case NBR_STA_PRESENT: | |
653 | if (nbr_pending_connect(nbr)) | |
50478845 | 654 | thread_cancel(&nbr->ev_connect); |
8429abe0 RW |
655 | break; |
656 | case NBR_STA_INITIAL: | |
657 | case NBR_STA_OPENREC: | |
658 | case NBR_STA_OPENSENT: | |
d4d6e7d8 KS |
659 | /* update SNMP session counters during initialization */ |
660 | leconf->stats.session_attempts++; | |
661 | send_notification(nbr->tcp, status, msg_id, msg_type); | |
662 | ||
663 | nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION); | |
664 | break; | |
8429abe0 | 665 | case NBR_STA_OPER: |
adbdf465 | 666 | send_notification(nbr->tcp, status, msg_id, msg_type); |
8429abe0 RW |
667 | |
668 | nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION); | |
669 | break; | |
670 | default: | |
671 | fatalx("session_shutdown: unknown neighbor state"); | |
672 | } | |
673 | } | |
674 | ||
675 | void | |
676 | session_close(struct nbr *nbr) | |
677 | { | |
903a7226 MS |
678 | log_debug("%s: closing session with lsr-id %pI4", __func__, |
679 | &nbr->id); | |
8429abe0 | 680 | |
e1894ff7 KS |
681 | ldp_sync_fsm_nbr_event(nbr, LDP_SYNC_EVT_SESSION_CLOSE); |
682 | ||
8429abe0 RW |
683 | tcp_close(nbr->tcp); |
684 | nbr_stop_ktimer(nbr); | |
685 | nbr_stop_ktimeout(nbr); | |
686 | nbr_stop_itimeout(nbr); | |
687 | } | |
688 | ||
689 | static ssize_t | |
690 | session_get_pdu(struct ibuf_read *r, char **b) | |
691 | { | |
692 | struct ldp_hdr l; | |
693 | size_t av, dlen, left; | |
694 | ||
695 | av = r->wpos; | |
696 | if (av < sizeof(l)) | |
697 | return (0); | |
698 | ||
699 | memcpy(&l, r->buf, sizeof(l)); | |
700 | dlen = ntohs(l.length) + LDP_HDR_DEAD_LEN; | |
701 | if (dlen > av) | |
702 | return (0); | |
703 | ||
704 | if ((*b = malloc(dlen)) == NULL) | |
705 | return (-1); | |
706 | ||
707 | memcpy(*b, r->buf, dlen); | |
708 | if (dlen < av) { | |
709 | left = av - dlen; | |
710 | memmove(r->buf, r->buf + dlen, left); | |
711 | r->wpos = left; | |
712 | } else | |
713 | r->wpos = 0; | |
714 | ||
715 | return (dlen); | |
716 | } | |
717 | ||
718 | struct tcp_conn * | |
719 | tcp_new(int fd, struct nbr *nbr) | |
720 | { | |
eac6e3f0 | 721 | struct tcp_conn *tcp; |
f82a5428 RW |
722 | struct sockaddr_storage ss; |
723 | socklen_t len = sizeof(ss); | |
8429abe0 RW |
724 | |
725 | if ((tcp = calloc(1, sizeof(*tcp))) == NULL) | |
726 | fatal(__func__); | |
727 | ||
728 | tcp->fd = fd; | |
729 | evbuf_init(&tcp->wbuf, tcp->fd, session_write, tcp); | |
730 | ||
731 | if (nbr) { | |
732 | if ((tcp->rbuf = calloc(1, sizeof(struct ibuf_read))) == NULL) | |
733 | fatal(__func__); | |
734 | ||
66e78ae6 | 735 | thread_add_read(master, session_read, nbr, tcp->fd, &tcp->rev); |
8429abe0 RW |
736 | tcp->nbr = nbr; |
737 | } | |
738 | ||
f82a5428 RW |
739 | if (getsockname(fd, (struct sockaddr *)&ss, &len) != 0) |
740 | log_warn("%s: getsockname", __func__); | |
741 | else | |
742 | sa2addr((struct sockaddr *)&ss, NULL, NULL, &tcp->lport); | |
743 | if (getpeername(fd, (struct sockaddr *)&ss, &len) != 0) | |
744 | log_warn("%s: getpeername", __func__); | |
745 | else | |
746 | sa2addr((struct sockaddr *)&ss, NULL, NULL, &tcp->rport); | |
eac6e3f0 | 747 | |
8429abe0 RW |
748 | return (tcp); |
749 | } | |
750 | ||
751 | static void | |
752 | tcp_close(struct tcp_conn *tcp) | |
753 | { | |
754 | /* try to flush write buffer */ | |
755 | msgbuf_write(&tcp->wbuf.wbuf); | |
756 | evbuf_clear(&tcp->wbuf); | |
757 | ||
758 | if (tcp->nbr) { | |
50478845 | 759 | thread_cancel(&tcp->rev); |
8429abe0 RW |
760 | free(tcp->rbuf); |
761 | tcp->nbr->tcp = NULL; | |
762 | } | |
763 | ||
764 | close(tcp->fd); | |
765 | accept_unpause(); | |
766 | free(tcp); | |
767 | } | |
768 | ||
769 | static struct pending_conn * | |
770 | pending_conn_new(int fd, int af, union ldpd_addr *addr) | |
771 | { | |
772 | struct pending_conn *pconn; | |
8429abe0 RW |
773 | |
774 | if ((pconn = calloc(1, sizeof(*pconn))) == NULL) | |
775 | fatal(__func__); | |
776 | ||
777 | pconn->fd = fd; | |
778 | pconn->af = af; | |
779 | pconn->addr = *addr; | |
8429abe0 | 780 | TAILQ_INSERT_TAIL(&global.pending_conns, pconn, entry); |
66e78ae6 QY |
781 | pconn->ev_timeout = NULL; |
782 | thread_add_timer(master, pending_conn_timeout, pconn, PENDING_CONN_TIMEOUT, | |
783 | &pconn->ev_timeout); | |
8429abe0 RW |
784 | |
785 | return (pconn); | |
786 | } | |
787 | ||
788 | void | |
789 | pending_conn_del(struct pending_conn *pconn) | |
790 | { | |
50478845 | 791 | thread_cancel(&pconn->ev_timeout); |
8429abe0 RW |
792 | TAILQ_REMOVE(&global.pending_conns, pconn, entry); |
793 | free(pconn); | |
794 | } | |
795 | ||
796 | struct pending_conn * | |
797 | pending_conn_find(int af, union ldpd_addr *addr) | |
798 | { | |
799 | struct pending_conn *pconn; | |
800 | ||
801 | TAILQ_FOREACH(pconn, &global.pending_conns, entry) | |
802 | if (af == pconn->af && | |
803 | ldp_addrcmp(af, addr, &pconn->addr) == 0) | |
804 | return (pconn); | |
805 | ||
806 | return (NULL); | |
807 | } | |
808 | ||
cc9f21da | 809 | static void pending_conn_timeout(struct thread *thread) |
8429abe0 | 810 | { |
eac6e3f0 | 811 | struct pending_conn *pconn = THREAD_ARG(thread); |
8429abe0 RW |
812 | struct tcp_conn *tcp; |
813 | ||
eac6e3f0 RW |
814 | pconn->ev_timeout = NULL; |
815 | ||
8429abe0 RW |
816 | log_debug("%s: no adjacency with remote end: %s", __func__, |
817 | log_addr(pconn->af, &pconn->addr)); | |
818 | ||
819 | /* | |
820 | * Create a write buffer detached from any neighbor to send a | |
821 | * notification message reliably. | |
822 | */ | |
823 | tcp = tcp_new(pconn->fd, NULL); | |
adbdf465 | 824 | send_notification(tcp, S_NO_HELLO, 0, 0); |
8429abe0 RW |
825 | msgbuf_write(&tcp->wbuf.wbuf); |
826 | ||
827 | pending_conn_del(pconn); | |
828 | } |