1/*-
2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * a) Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.

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26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31/* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $ */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/sys/netinet/sctp_bsd_addr.c 178251 2008-04-16 17:24:18Z rrs $");
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
52/* Declare all of our malloc named types */
53
54/* Note to Michael/Peter for mac-os,
55 * I think mac has this too since I
56 * do see the M_PCB type, so I
57 * will also put in the mac file the
58 * MALLOC_DECLARE. If this does not
59 * work for mac uncomment the defines for

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80MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control");
81MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option");
82
83
84#if defined(SCTP_USE_THREAD_BASED_ITERATOR)
85void
86sctp_wakeup_iterator(void)
87{
88 wakeup(&sctppcbinfo.iterator_running);
89}
90
91static void
92sctp_iterator_thread(void *v)
93{
94 SCTP_IPI_ITERATOR_WQ_LOCK();
95 sctppcbinfo.iterator_running = 0;
96 while (1) {
97 msleep(&sctppcbinfo.iterator_running,
98 &sctppcbinfo.ipi_iterator_wq_mtx,
99 0, "waiting_for_work", 0);
100 sctp_iterator_worker();
101 }
102}
103
104void
105sctp_startup_iterator(void)
106{
107 int ret;
108
109 ret = kproc_create(sctp_iterator_thread,
110 (void *)NULL,
111 &sctppcbinfo.thread_proc,
112 RFPROC,
113 SCTP_KTHREAD_PAGES,
114 SCTP_KTRHEAD_NAME);
115}
116
117#endif
118
119#ifdef INET6

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167 case IFT_XETHER:
168 case IFT_ISDNBASIC:
169 case IFT_ISDNPRIMARY:
170 case IFT_PTPSERIAL:
171 case IFT_OTHER:
172 case IFT_PPP:
173 case IFT_LOOP:
174 case IFT_SLIP:
175 case IFT_IP:
176 case IFT_IPOVERCDLC:
177 case IFT_IPOVERCLAW:
178 case IFT_VIRTUALIPADDRESS:
179 result = 1;
180 break;
181 default:
182 result = 0;
183 }
184
185 return (result);
186}
187
188static void
189sctp_init_ifns_for_vrf(int vrfid)
190{
191 /*
192 * Here we must apply ANY locks needed by the IFN we access and also
193 * make sure we lock any IFA that exists as we float through the
194 * list of IFA's
195 */
196 struct ifnet *ifn;
197 struct ifaddr *ifa;
198 struct in6_ifaddr *ifa6;
199 struct sctp_ifa *sctp_ifa;
200 uint32_t ifa_flags;
201
202 TAILQ_FOREACH(ifn, &ifnet, if_list) {
203 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
204 if (ifa->ifa_addr == NULL) {
205 continue;
206 }
207 if ((ifa->ifa_addr->sa_family != AF_INET) &&
208 (ifa->ifa_addr->sa_family != AF_INET6)
209 ) {
210 /* non inet/inet6 skip */
211 continue;
212 }
213 if (ifa->ifa_addr->sa_family == AF_INET6) {
214 ifa6 = (struct in6_ifaddr *)ifa;
215 ifa_flags = ifa6->ia6_flags;
216 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
217 /* skip unspecifed addresses */
218 continue;
219 }
220 } else if (ifa->ifa_addr->sa_family == AF_INET) {
221 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
222 continue;
223 }
224 }
225 if (sctp_is_desired_interface_type(ifa) == 0) {
226 /* non desired type */
227 continue;
228 }
229 if ((ifa->ifa_addr->sa_family == AF_INET6) ||
230 (ifa->ifa_addr->sa_family == AF_INET)) {
231 if (ifa->ifa_addr->sa_family == AF_INET6) {
232 ifa6 = (struct in6_ifaddr *)ifa;
233 ifa_flags = ifa6->ia6_flags;
234 } else {
235 ifa_flags = 0;
236 }
237 sctp_ifa = sctp_add_addr_to_vrf(vrfid,
238 (void *)ifn,
239 ifn->if_index,
240 ifn->if_type,
241 ifn->if_xname,
242 (void *)ifa,
243 ifa->ifa_addr,
244 ifa_flags, 0
245 );
246 if (sctp_ifa) {
247 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
248 }
249 }
250 }
251 }
252}
253
254
255void
256sctp_init_vrf_list(int vrfid)
257{

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264
265 /*
266 * Now we need to build all the ifn's for this vrf and there
267 * addresses
268 */
269 sctp_init_ifns_for_vrf(vrfid);
270}
271
272static uint8_t first_time = 0;
273
274
275void
276sctp_addr_change(struct ifaddr *ifa, int cmd)
277{
278 struct sctp_ifa *ifap = NULL;
279 uint32_t ifa_flags = 0;
280 struct in6_ifaddr *ifa6;
281
282 /*
283 * BSD only has one VRF, if this changes we will need to hook in the
284 * right things here to get the id to pass to the address managment
285 * routine.
286 */
287 if (first_time == 0) {
288 /* Special test to see if my ::1 will showup with this */
289 first_time = 1;
290 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
291 }
292 if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
293 /* don't know what to do with this */
294 return;
295 }
296 if (ifa->ifa_addr == NULL) {
297 return;
298 }
299 if ((ifa->ifa_addr->sa_family != AF_INET) &&
300 (ifa->ifa_addr->sa_family != AF_INET6)
301 ) {
302 /* non inet/inet6 skip */
303 return;
304 }
305 if (ifa->ifa_addr->sa_family == AF_INET6) {
306 ifa6 = (struct in6_ifaddr *)ifa;
307 ifa_flags = ifa6->ia6_flags;
308 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
309 /* skip unspecifed addresses */
310 return;
311 }
312 } else if (ifa->ifa_addr->sa_family == AF_INET) {
313 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
314 return;
315 }
316 }
317 if (sctp_is_desired_interface_type(ifa) == 0) {
318 /* non desired type */
319 return;
320 }
321 if (cmd == RTM_ADD) {
322 ifap = sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
323 ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type,
324 ifa->ifa_ifp->if_xname,
325 (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
326 } else if (cmd == RTM_DELETE) {
327
328 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
329 ifa->ifa_ifp->if_index,
330 ifa->ifa_ifp->if_xname
331 );
332 /*
333 * We don't bump refcount here so when it completes the
334 * final delete will happen.
335 */
336 }
337}
338
339struct mbuf *
340sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
341 int how, int allonebuf, int type)
342{
343 struct mbuf *m = NULL;
344
345 m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
346 if (m == NULL) {

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363 return (NULL);
364 }
365 }
366 if (SCTP_BUF_NEXT(m)) {
367 sctp_m_freem(SCTP_BUF_NEXT(m));
368 SCTP_BUF_NEXT(m) = NULL;
369 }
370#ifdef SCTP_MBUF_LOGGING
371 if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
372 if (SCTP_BUF_IS_EXTENDED(m)) {
373 sctp_log_mb(m, SCTP_MBUF_IALLOC);
374 }
375 }
376#endif
377 return (m);
378}
379
380
381#ifdef SCTP_PACKET_LOGGING
382
383int packet_log_writers = 0;
384int packet_log_end = 0;
385uint8_t packet_log_buffer[SCTP_PACKET_LOG_SIZE];
386
387
388void
389sctp_packet_log(struct mbuf *m, int length)
390{
391 int *lenat, thisone;
392 void *copyto;
393 uint32_t *tick_tock;
394 int total_len;
395 int grabbed_lock = 0;

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401 * where this started (thisbegin) x <--end points here
402 */
403 total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
404 /* Log a packet to the buffer. */
405 if (total_len > SCTP_PACKET_LOG_SIZE) {
406 /* Can't log this packet I have not a buffer big enough */
407 return;
408 }
409 if (length < (SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
410 return;
411 }
412 atomic_add_int(&packet_log_writers, 1);
413try_again:
414 if (packet_log_writers > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
415 SCTP_IP_PKTLOG_LOCK();
416 grabbed_lock = 1;
417again_locked:
418 value = packet_log_end;
419 newval = packet_log_end + total_len;
420 if (newval >= SCTP_PACKET_LOG_SIZE) {
421 /* we wrapped */
422 thisbegin = 0;
423 thisend = total_len;
424 } else {
425 thisbegin = packet_log_end;
426 thisend = newval;
427 }
428 if (!(atomic_cmpset_int(&packet_log_end, value, thisend))) {
429 goto again_locked;
430 }
431 } else {
432 value = packet_log_end;
433 newval = packet_log_end + total_len;
434 if (newval >= SCTP_PACKET_LOG_SIZE) {
435 /* we wrapped */
436 thisbegin = 0;
437 thisend = total_len;
438 } else {
439 thisbegin = packet_log_end;
440 thisend = newval;
441 }
442 if (!(atomic_cmpset_int(&packet_log_end, value, thisend))) {
443 goto try_again;
444 }
445 }
446 /* Sanity check */
447 if (thisend >= SCTP_PACKET_LOG_SIZE) {
448 printf("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
449 thisbegin,
450 thisend,
451 packet_log_writers,
452 grabbed_lock,
453 packet_log_end);
454 packet_log_end = 0;
455 goto no_log;
456
457 }
458 lenat = (int *)&packet_log_buffer[thisbegin];
459 *lenat = total_len;
460 lenat++;
461 *lenat = value;
462 lenat++;
463 tick_tock = (uint32_t *) lenat;
464 lenat++;
465 *tick_tock = sctp_get_tick_count();
466 copyto = (void *)lenat;
467 thisone = thisend - sizeof(int);
468 lenat = (int *)&packet_log_buffer[thisone];
469 *lenat = thisbegin;
470 if (grabbed_lock) {
471 SCTP_IP_PKTLOG_UNLOCK();
472 grabbed_lock = 0;
473 }
474 m_copydata(m, 0, length, (caddr_t)copyto);
475no_log:
476 if (grabbed_lock) {
477 SCTP_IP_PKTLOG_UNLOCK();
478 }
479 atomic_subtract_int(&packet_log_writers, 1);
480}
481
482
483int
484sctp_copy_out_packet_log(uint8_t * target, int length)
485{
486 /*
487 * We wind through the packet log starting at start copying up to
488 * length bytes out. We return the number of bytes copied.
489 */
490 int tocopy, this_copy;
491 int *lenat;
492 int did_delay = 0;
493
494 tocopy = length;
495 if (length < (2 * sizeof(int))) {
496 /* not enough room */
497 return (0);
498 }
499 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
500 atomic_add_int(&packet_log_writers, SCTP_PKTLOG_WRITERS_NEED_LOCK);
501again:
502 if ((did_delay == 0) && (packet_log_writers != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
503 /*
504 * we delay here for just a moment hoping the
505 * writer(s) that were present when we entered will
506 * have left and we only have locking ones that will
507 * contend with us for the lock. This does not
508 * assure 100% access, but its good enough for a
509 * logging facility like this.
510 */
511 did_delay = 1;
512 DELAY(10);
513 goto again;
514 }
515 }
516 SCTP_IP_PKTLOG_LOCK();
517 lenat = (int *)target;
518 *lenat = packet_log_end;
519 lenat++;
520 this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
521 memcpy((void *)lenat, (void *)packet_log_buffer, this_copy);
522 if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
523 atomic_subtract_int(&packet_log_writers,
524 SCTP_PKTLOG_WRITERS_NEED_LOCK);
525 }
526 SCTP_IP_PKTLOG_UNLOCK();
527 return (this_copy + sizeof(int));
528}
529
530#endif