1 /*-
2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
12 * b) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the distribution.
15 *
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/11.2/sys/netinet/sctp_bsd_addr.c 331722 2018-03-29 02:50:57Z eadler $");
35
36 #include <netinet/sctp_os.h>
37 #include <netinet/sctp_var.h>
38 #include <netinet/sctp_pcb.h>
39 #include <netinet/sctp_header.h>
40 #include <netinet/sctputil.h>
41 #include <netinet/sctp_output.h>
42 #include <netinet/sctp_bsd_addr.h>
43 #include <netinet/sctp_uio.h>
44 #include <netinet/sctputil.h>
45 #include <netinet/sctp_timer.h>
46 #include <netinet/sctp_asconf.h>
47 #include <netinet/sctp_sysctl.h>
48 #include <netinet/sctp_indata.h>
49 #include <sys/unistd.h>
50
51 /* Declare all of our malloc named types */
52 MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor");
53 MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array");
54 MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array");
55 MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address");
56 MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator");
57 MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist");
58 MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key");
59 MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list");
60 MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info");
61 MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset");
62 MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer");
63 MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all");
64 MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct");
65 MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct");
66 MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct");
67 MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block");
68 MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list");
69 MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control");
70 MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option");
71 MALLOC_DEFINE(SCTP_M_MCORE, "sctp_mcore", "sctp mcore queue");
72
73 /* Global NON-VNET structure that controls the iterator */
74 struct iterator_control sctp_it_ctl;
75
76
77 void
78 sctp_wakeup_iterator(void)
79 {
80 wakeup(&sctp_it_ctl.iterator_running);
81 }
82
83 static void
84 sctp_iterator_thread(void *v SCTP_UNUSED)
85 {
86 SCTP_IPI_ITERATOR_WQ_LOCK();
87 /* In FreeBSD this thread never terminates. */
88 for (;;) {
89 msleep(&sctp_it_ctl.iterator_running,
90 &sctp_it_ctl.ipi_iterator_wq_mtx,
91 0, "waiting_for_work", 0);
92 sctp_iterator_worker();
93 }
94 }
95
96 void
97 sctp_startup_iterator(void)
98 {
99 if (sctp_it_ctl.thread_proc) {
100 /* You only get one */
101 return;
102 }
103 /* Initialize global locks here, thus only once. */
104 SCTP_ITERATOR_LOCK_INIT();
105 SCTP_IPI_ITERATOR_WQ_INIT();
106 TAILQ_INIT(&sctp_it_ctl.iteratorhead);
107 kproc_create(sctp_iterator_thread,
108 (void *)NULL,
109 &sctp_it_ctl.thread_proc,
110 RFPROC,
111 SCTP_KTHREAD_PAGES,
112 SCTP_KTRHEAD_NAME);
113 }
114
115 #ifdef INET6
116
117 void
118 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
119 {
120 struct in6_ifaddr *ifa6;
121
122 ifa6 = (struct in6_ifaddr *)ifa->ifa;
123 ifa->flags = ifa6->ia6_flags;
124 if (!MODULE_GLOBAL(ip6_use_deprecated)) {
125 if (ifa->flags &
126 IN6_IFF_DEPRECATED) {
127 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
128 } else {
129 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
130 }
131 } else {
132 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
133 }
134 if (ifa->flags &
135 (IN6_IFF_DETACHED |
136 IN6_IFF_ANYCAST |
137 IN6_IFF_NOTREADY)) {
138 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
139 } else {
140 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
141 }
142 }
143 #endif /* INET6 */
144
145
146 static uint32_t
147 sctp_is_desired_interface_type(struct ifnet *ifn)
148 {
149 int result;
150
151 /* check the interface type to see if it's one we care about */
152 switch (ifn->if_type) {
153 case IFT_ETHER:
154 case IFT_ISO88023:
155 case IFT_ISO88024:
156 case IFT_ISO88025:
157 case IFT_ISO88026:
158 case IFT_STARLAN:
159 case IFT_P10:
160 case IFT_P80:
161 case IFT_HY:
162 case IFT_FDDI:
163 case IFT_XETHER:
164 case IFT_ISDNBASIC:
165 case IFT_ISDNPRIMARY:
166 case IFT_PTPSERIAL:
167 case IFT_OTHER:
168 case IFT_PPP:
169 case IFT_LOOP:
170 case IFT_SLIP:
171 case IFT_GIF:
172 case IFT_L2VLAN:
173 case IFT_STF:
174 case IFT_IP:
175 case IFT_IPOVERCDLC:
176 case IFT_IPOVERCLAW:
177 case IFT_PROPVIRTUAL: /* NetGraph Virtual too */
178 case IFT_VIRTUALIPADDRESS:
179 result = 1;
180 break;
181 default:
182 result = 0;
183 }
184
185 return (result);
186 }
187
188
189
190
191 static void
192 sctp_init_ifns_for_vrf(int vrfid)
193 {
194 /*
195 * Here we must apply ANY locks needed by the IFN we access and also
196 * make sure we lock any IFA that exists as we float through the
197 * list of IFA's
198 */
199 struct ifnet *ifn;
200 struct ifaddr *ifa;
201 struct sctp_ifa *sctp_ifa;
202 uint32_t ifa_flags;
203 #ifdef INET6
204 struct in6_ifaddr *ifa6;
205 #endif
206
207 IFNET_RLOCK();
208 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
209 if (sctp_is_desired_interface_type(ifn) == 0) {
210 /* non desired type */
211 continue;
212 }
213 IF_ADDR_RLOCK(ifn);
214 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
215 if (ifa->ifa_addr == NULL) {
216 continue;
217 }
218 switch (ifa->ifa_addr->sa_family) {
219 #ifdef INET
220 case AF_INET:
221 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
222 continue;
223 }
224 break;
225 #endif
226 #ifdef INET6
227 case AF_INET6:
228 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
229 /* skip unspecifed addresses */
230 continue;
231 }
232 break;
233 #endif
234 default:
235 continue;
236 }
237 switch (ifa->ifa_addr->sa_family) {
238 #ifdef INET
239 case AF_INET:
240 ifa_flags = 0;
241 break;
242 #endif
243 #ifdef INET6
244 case AF_INET6:
245 ifa6 = (struct in6_ifaddr *)ifa;
246 ifa_flags = ifa6->ia6_flags;
247 break;
248 #endif
249 default:
250 ifa_flags = 0;
251 break;
252 }
253 sctp_ifa = sctp_add_addr_to_vrf(vrfid,
254 (void *)ifn,
255 ifn->if_index,
256 ifn->if_type,
257 ifn->if_xname,
258 (void *)ifa,
259 ifa->ifa_addr,
260 ifa_flags,
261 0);
262 if (sctp_ifa) {
263 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
264 }
265 }
266 IF_ADDR_RUNLOCK(ifn);
267 }
268 IFNET_RUNLOCK();
269 }
270
271 void
272 sctp_init_vrf_list(int vrfid)
273 {
274 if (vrfid > SCTP_MAX_VRF_ID)
275 /* can't do that */
276 return;
277
278 /* Don't care about return here */
279 (void)sctp_allocate_vrf(vrfid);
280
281 /*
282 * Now we need to build all the ifn's for this vrf and there
283 * addresses
284 */
285 sctp_init_ifns_for_vrf(vrfid);
286 }
287
288 void
289 sctp_addr_change(struct ifaddr *ifa, int cmd)
290 {
291 uint32_t ifa_flags = 0;
292
293 if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
294 return;
295 }
296 /*
297 * BSD only has one VRF, if this changes we will need to hook in the
298 * right things here to get the id to pass to the address management
299 * routine.
300 */
301 if (SCTP_BASE_VAR(first_time) == 0) {
302 /* Special test to see if my ::1 will showup with this */
303 SCTP_BASE_VAR(first_time) = 1;
304 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
305 }
306 if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
307 /* don't know what to do with this */
308 return;
309 }
310 if (ifa->ifa_addr == NULL) {
311 return;
312 }
313 if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) {
314 /* non desired type */
315 return;
316 }
317 switch (ifa->ifa_addr->sa_family) {
318 #ifdef INET
319 case AF_INET:
320 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
321 return;
322 }
323 break;
324 #endif
325 #ifdef INET6
326 case AF_INET6:
327 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
328 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
329 /* skip unspecifed addresses */
330 return;
331 }
332 break;
333 #endif
334 default:
335 /* non inet/inet6 skip */
336 return;
337 }
338 if (cmd == RTM_ADD) {
339 (void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
340 ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname,
341 (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
342 } else {
343
344 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
345 ifa->ifa_ifp->if_index,
346 ifa->ifa_ifp->if_xname);
347
348 /*
349 * We don't bump refcount here so when it completes the
350 * final delete will happen.
351 */
352 }
353 }
354
355 void
356 sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){
357 struct ifnet *ifn;
358 struct ifaddr *ifa;
359
360 IFNET_RLOCK();
361 TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
362 if (!(*pred) (ifn)) {
363 continue;
364 }
365 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
366 sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE);
367 }
368 }
369 IFNET_RUNLOCK();
370 }
371
372 struct mbuf *
373 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
374 int how, int allonebuf, int type)
375 {
376 struct mbuf *m = NULL;
377
378 m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
379 if (m == NULL) {
380 /* bad, no memory */
381 return (m);
382 }
383 if (allonebuf) {
384 if (SCTP_BUF_SIZE(m) < space_needed) {
385 m_freem(m);
386 return (NULL);
387 }
388 }
389 if (SCTP_BUF_NEXT(m)) {
390 sctp_m_freem(SCTP_BUF_NEXT(m));
391 SCTP_BUF_NEXT(m) = NULL;
392 }
393 #ifdef SCTP_MBUF_LOGGING
394 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
395 sctp_log_mb(m, SCTP_MBUF_IALLOC);
396 }
397 #endif
398 return (m);
399 }
400
401
402 #ifdef SCTP_PACKET_LOGGING
403 void
404 sctp_packet_log(struct mbuf *m)
405 {
406 int *lenat, thisone;
407 void *copyto;
408 uint32_t *tick_tock;
409 int length;
410 int total_len;
411 int grabbed_lock = 0;
412 int value, newval, thisend, thisbegin;
413
414 /*
415 * Buffer layout. -sizeof this entry (total_len) -previous end
416 * (value) -ticks of log (ticks) o -ip packet o -as logged -
417 * where this started (thisbegin) x <--end points here
418 */
419 length = SCTP_HEADER_LEN(m);
420 total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
421 /* Log a packet to the buffer. */
422 if (total_len > SCTP_PACKET_LOG_SIZE) {
423 /* Can't log this packet I have not a buffer big enough */
424 return;
425 }
426 if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
427 return;
428 }
429 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
430 try_again:
431 if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
432 SCTP_IP_PKTLOG_LOCK();
433 grabbed_lock = 1;
434 again_locked:
435 value = SCTP_BASE_VAR(packet_log_end);
436 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
437 if (newval >= SCTP_PACKET_LOG_SIZE) {
438 /* we wrapped */
439 thisbegin = 0;
440 thisend = total_len;
441 } else {
442 thisbegin = SCTP_BASE_VAR(packet_log_end);
443 thisend = newval;
444 }
445 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
446 goto again_locked;
447 }
448 } else {
449 value = SCTP_BASE_VAR(packet_log_end);
450 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
451 if (newval >= SCTP_PACKET_LOG_SIZE) {
452 /* we wrapped */
453 thisbegin = 0;
454 thisend = total_len;
455 } else {
456 thisbegin = SCTP_BASE_VAR(packet_log_end);
457 thisend = newval;
458 }
459 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
460 goto try_again;
461 }
462 }
463 /* Sanity check */
464 if (thisend >= SCTP_PACKET_LOG_SIZE) {
465 SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
466 thisbegin,
467 thisend,
468 SCTP_BASE_VAR(packet_log_writers),
469 grabbed_lock,
470 SCTP_BASE_VAR(packet_log_end));
471 SCTP_BASE_VAR(packet_log_end) = 0;
472 goto no_log;
473
474 }
475 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
476 *lenat = total_len;
477 lenat++;
478 *lenat = value;
479 lenat++;
480 tick_tock = (uint32_t *)lenat;
481 lenat++;
482 *tick_tock = sctp_get_tick_count();
483 copyto = (void *)lenat;
484 thisone = thisend - sizeof(int);
485 lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
486 *lenat = thisbegin;
487 if (grabbed_lock) {
488 SCTP_IP_PKTLOG_UNLOCK();
489 grabbed_lock = 0;
490 }
491 m_copydata(m, 0, length, (caddr_t)copyto);
492 no_log:
493 if (grabbed_lock) {
494 SCTP_IP_PKTLOG_UNLOCK();
495 }
496 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
497 }
498
499
500 int
501 sctp_copy_out_packet_log(uint8_t *target, int length)
502 {
503 /*
504 * We wind through the packet log starting at start copying up to
505 * length bytes out. We return the number of bytes copied.
506 */
507 int tocopy, this_copy;
508 int *lenat;
509 int did_delay = 0;
510
511 tocopy = length;
512 if (length < (int)(2 * sizeof(int))) {
513 /* not enough room */
514 return (0);
515 }
516 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
517 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
518 again:
519 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
520 /*
521 * we delay here for just a moment hoping the
522 * writer(s) that were present when we entered will
523 * have left and we only have locking ones that will
524 * contend with us for the lock. This does not
525 * assure 100% access, but its good enough for a
526 * logging facility like this.
527 */
528 did_delay = 1;
529 DELAY(10);
530 goto again;
531 }
532 }
533 SCTP_IP_PKTLOG_LOCK();
534 lenat = (int *)target;
535 *lenat = SCTP_BASE_VAR(packet_log_end);
536 lenat++;
537 this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
538 memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
539 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
540 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
541 SCTP_PKTLOG_WRITERS_NEED_LOCK);
542 }
543 SCTP_IP_PKTLOG_UNLOCK();
544 return (this_copy + sizeof(int));
545 }
546
547 #endif
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