xref: /freebsd/sys/netinet/sctp_bsd_addr.c (revision 273c26a3c3bea87a241d6879abd4f991db180bf0)
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("$FreeBSD$");
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 
144 #endif				/* INET6 */
145 
146 
147 static uint32_t
148 sctp_is_desired_interface_type(struct ifnet *ifn)
149 {
150 	int result;
151 
152 	/* check the interface type to see if it's one we care about */
153 	switch (ifn->if_type) {
154 	case IFT_ETHER:
155 	case IFT_ISO88023:
156 	case IFT_ISO88024:
157 	case IFT_ISO88025:
158 	case IFT_ISO88026:
159 	case IFT_STARLAN:
160 	case IFT_P10:
161 	case IFT_P80:
162 	case IFT_HY:
163 	case IFT_FDDI:
164 	case IFT_XETHER:
165 	case IFT_ISDNBASIC:
166 	case IFT_ISDNPRIMARY:
167 	case IFT_PTPSERIAL:
168 	case IFT_OTHER:
169 	case IFT_PPP:
170 	case IFT_LOOP:
171 	case IFT_SLIP:
172 	case IFT_GIF:
173 	case IFT_L2VLAN:
174 	case IFT_STF:
175 	case IFT_IP:
176 	case IFT_IPOVERCDLC:
177 	case IFT_IPOVERCLAW:
178 	case IFT_PROPVIRTUAL:	/* NetGraph Virtual too */
179 	case IFT_VIRTUALIPADDRESS:
180 		result = 1;
181 		break;
182 	default:
183 		result = 0;
184 	}
185 
186 	return (result);
187 }
188 
189 
190 
191 
192 static void
193 sctp_init_ifns_for_vrf(int vrfid)
194 {
195 	/*
196 	 * Here we must apply ANY locks needed by the IFN we access and also
197 	 * make sure we lock any IFA that exists as we float through the
198 	 * list of IFA's
199 	 */
200 	struct ifnet *ifn;
201 	struct ifaddr *ifa;
202 	struct sctp_ifa *sctp_ifa;
203 	uint32_t ifa_flags;
204 
205 #ifdef INET6
206 	struct in6_ifaddr *ifa6;
207 
208 #endif
209 
210 	IFNET_RLOCK();
211 	TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
212 		if (sctp_is_desired_interface_type(ifn) == 0) {
213 			/* non desired type */
214 			continue;
215 		}
216 		IF_ADDR_RLOCK(ifn);
217 		TAILQ_FOREACH(ifa, &ifn->if_addrhead, ifa_link) {
218 			if (ifa->ifa_addr == NULL) {
219 				continue;
220 			}
221 			switch (ifa->ifa_addr->sa_family) {
222 #ifdef INET
223 			case AF_INET:
224 				if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
225 					continue;
226 				}
227 				break;
228 #endif
229 #ifdef INET6
230 			case AF_INET6:
231 				if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
232 					/* skip unspecifed addresses */
233 					continue;
234 				}
235 				break;
236 #endif
237 			default:
238 				continue;
239 			}
240 			switch (ifa->ifa_addr->sa_family) {
241 #ifdef INET
242 			case AF_INET:
243 				ifa_flags = 0;
244 				break;
245 #endif
246 #ifdef INET6
247 			case AF_INET6:
248 				ifa6 = (struct in6_ifaddr *)ifa;
249 				ifa_flags = ifa6->ia6_flags;
250 				break;
251 #endif
252 			default:
253 				ifa_flags = 0;
254 				break;
255 			}
256 			sctp_ifa = sctp_add_addr_to_vrf(vrfid,
257 			    (void *)ifn,
258 			    ifn->if_index,
259 			    ifn->if_type,
260 			    ifn->if_xname,
261 			    (void *)ifa,
262 			    ifa->ifa_addr,
263 			    ifa_flags,
264 			    0);
265 			if (sctp_ifa) {
266 				sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
267 			}
268 		}
269 		IF_ADDR_RUNLOCK(ifn);
270 	}
271 	IFNET_RUNLOCK();
272 }
273 
274 void
275 sctp_init_vrf_list(int vrfid)
276 {
277 	if (vrfid > SCTP_MAX_VRF_ID)
278 		/* can't do that */
279 		return;
280 
281 	/* Don't care about return here */
282 	(void)sctp_allocate_vrf(vrfid);
283 
284 	/*
285 	 * Now we need to build all the ifn's for this vrf and there
286 	 * addresses
287 	 */
288 	sctp_init_ifns_for_vrf(vrfid);
289 }
290 
291 void
292 sctp_addr_change(struct ifaddr *ifa, int cmd)
293 {
294 	uint32_t ifa_flags = 0;
295 
296 	if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
297 		return;
298 	}
299 	/*
300 	 * BSD only has one VRF, if this changes we will need to hook in the
301 	 * right things here to get the id to pass to the address management
302 	 * routine.
303 	 */
304 	if (SCTP_BASE_VAR(first_time) == 0) {
305 		/* Special test to see if my ::1 will showup with this */
306 		SCTP_BASE_VAR(first_time) = 1;
307 		sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
308 	}
309 	if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
310 		/* don't know what to do with this */
311 		return;
312 	}
313 	if (ifa->ifa_addr == NULL) {
314 		return;
315 	}
316 	if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) {
317 		/* non desired type */
318 		return;
319 	}
320 	switch (ifa->ifa_addr->sa_family) {
321 #ifdef INET
322 	case AF_INET:
323 		if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
324 			return;
325 		}
326 		break;
327 #endif
328 #ifdef INET6
329 	case AF_INET6:
330 		ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
331 		if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
332 			/* skip unspecifed addresses */
333 			return;
334 		}
335 		break;
336 #endif
337 	default:
338 		/* non inet/inet6 skip */
339 		return;
340 	}
341 	if (cmd == RTM_ADD) {
342 		(void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
343 		    ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname,
344 		    (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
345 	} else {
346 
347 		sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
348 		    ifa->ifa_ifp->if_index,
349 		    ifa->ifa_ifp->if_xname);
350 
351 		/*
352 		 * We don't bump refcount here so when it completes the
353 		 * final delete will happen.
354 		 */
355 	}
356 }
357 
358 void
359      sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){
360 	struct ifnet *ifn;
361 	struct ifaddr *ifa;
362 
363 	IFNET_RLOCK();
364 	TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
365 		if (!(*pred) (ifn)) {
366 			continue;
367 		}
368 		TAILQ_FOREACH(ifa, &ifn->if_addrhead, ifa_link) {
369 			sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE);
370 		}
371 	}
372 	IFNET_RUNLOCK();
373 }
374 
375 struct mbuf *
376 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
377     int how, int allonebuf, int type)
378 {
379 	struct mbuf *m = NULL;
380 
381 	m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
382 	if (m == NULL) {
383 		/* bad, no memory */
384 		return (m);
385 	}
386 	if (allonebuf) {
387 		if (SCTP_BUF_SIZE(m) < space_needed) {
388 			m_freem(m);
389 			return (NULL);
390 		}
391 	}
392 	if (SCTP_BUF_NEXT(m)) {
393 		sctp_m_freem(SCTP_BUF_NEXT(m));
394 		SCTP_BUF_NEXT(m) = NULL;
395 	}
396 #ifdef SCTP_MBUF_LOGGING
397 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
398 		sctp_log_mb(m, SCTP_MBUF_IALLOC);
399 	}
400 #endif
401 	return (m);
402 }
403 
404 
405 #ifdef SCTP_PACKET_LOGGING
406 void
407 sctp_packet_log(struct mbuf *m)
408 {
409 	int *lenat, thisone;
410 	void *copyto;
411 	uint32_t *tick_tock;
412 	int length;
413 	int total_len;
414 	int grabbed_lock = 0;
415 	int value, newval, thisend, thisbegin;
416 
417 	/*
418 	 * Buffer layout. -sizeof this entry (total_len) -previous end
419 	 * (value) -ticks of log      (ticks) o -ip packet o -as logged -
420 	 * where this started (thisbegin) x <--end points here
421 	 */
422 	length = SCTP_HEADER_LEN(m);
423 	total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
424 	/* Log a packet to the buffer. */
425 	if (total_len > SCTP_PACKET_LOG_SIZE) {
426 		/* Can't log this packet I have not a buffer big enough */
427 		return;
428 	}
429 	if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
430 		return;
431 	}
432 	atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
433 try_again:
434 	if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
435 		SCTP_IP_PKTLOG_LOCK();
436 		grabbed_lock = 1;
437 again_locked:
438 		value = SCTP_BASE_VAR(packet_log_end);
439 		newval = SCTP_BASE_VAR(packet_log_end) + total_len;
440 		if (newval >= SCTP_PACKET_LOG_SIZE) {
441 			/* we wrapped */
442 			thisbegin = 0;
443 			thisend = total_len;
444 		} else {
445 			thisbegin = SCTP_BASE_VAR(packet_log_end);
446 			thisend = newval;
447 		}
448 		if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
449 			goto again_locked;
450 		}
451 	} else {
452 		value = SCTP_BASE_VAR(packet_log_end);
453 		newval = SCTP_BASE_VAR(packet_log_end) + total_len;
454 		if (newval >= SCTP_PACKET_LOG_SIZE) {
455 			/* we wrapped */
456 			thisbegin = 0;
457 			thisend = total_len;
458 		} else {
459 			thisbegin = SCTP_BASE_VAR(packet_log_end);
460 			thisend = newval;
461 		}
462 		if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
463 			goto try_again;
464 		}
465 	}
466 	/* Sanity check */
467 	if (thisend >= SCTP_PACKET_LOG_SIZE) {
468 		SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
469 		    thisbegin,
470 		    thisend,
471 		    SCTP_BASE_VAR(packet_log_writers),
472 		    grabbed_lock,
473 		    SCTP_BASE_VAR(packet_log_end));
474 		SCTP_BASE_VAR(packet_log_end) = 0;
475 		goto no_log;
476 
477 	}
478 	lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
479 	*lenat = total_len;
480 	lenat++;
481 	*lenat = value;
482 	lenat++;
483 	tick_tock = (uint32_t *) lenat;
484 	lenat++;
485 	*tick_tock = sctp_get_tick_count();
486 	copyto = (void *)lenat;
487 	thisone = thisend - sizeof(int);
488 	lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
489 	*lenat = thisbegin;
490 	if (grabbed_lock) {
491 		SCTP_IP_PKTLOG_UNLOCK();
492 		grabbed_lock = 0;
493 	}
494 	m_copydata(m, 0, length, (caddr_t)copyto);
495 no_log:
496 	if (grabbed_lock) {
497 		SCTP_IP_PKTLOG_UNLOCK();
498 	}
499 	atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
500 }
501 
502 
503 int
504 sctp_copy_out_packet_log(uint8_t * target, int length)
505 {
506 	/*
507 	 * We wind through the packet log starting at start copying up to
508 	 * length bytes out. We return the number of bytes copied.
509 	 */
510 	int tocopy, this_copy;
511 	int *lenat;
512 	int did_delay = 0;
513 
514 	tocopy = length;
515 	if (length < (int)(2 * sizeof(int))) {
516 		/* not enough room */
517 		return (0);
518 	}
519 	if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
520 		atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
521 again:
522 		if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
523 			/*
524 			 * we delay here for just a moment hoping the
525 			 * writer(s) that were present when we entered will
526 			 * have left and we only have locking ones that will
527 			 * contend with us for the lock. This does not
528 			 * assure 100% access, but its good enough for a
529 			 * logging facility like this.
530 			 */
531 			did_delay = 1;
532 			DELAY(10);
533 			goto again;
534 		}
535 	}
536 	SCTP_IP_PKTLOG_LOCK();
537 	lenat = (int *)target;
538 	*lenat = SCTP_BASE_VAR(packet_log_end);
539 	lenat++;
540 	this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
541 	memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
542 	if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
543 		atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
544 		    SCTP_PKTLOG_WRITERS_NEED_LOCK);
545 	}
546 	SCTP_IP_PKTLOG_UNLOCK();
547 	return (this_copy + sizeof(int));
548 }
549 
550 #endif
551