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MFC r217727
[FreeBSD/releng/8.2.git] / sys / netinet / sctp_bsd_addr.c
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.
9  *
10  * b) Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in
12  *   the documentation and/or other materials provided with the distribution.
13  *
14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
15  *    contributors may be used to endorse or promote products derived
16  *    from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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("$FreeBSD$");
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
72 /* Global NON-VNET structure that controls the iterator */
73 struct iterator_control sctp_it_ctl;
74 static int __sctp_thread_based_iterator_started = 0;
75
76
77 static void
78 sctp_cleanup_itqueue(void)
79 {
80         struct sctp_iterator *it;
81
82         while ((it = TAILQ_FIRST(&sctp_it_ctl.iteratorhead)) != NULL) {
83                 if (it->function_atend != NULL) {
84                         (*it->function_atend) (it->pointer, it->val);
85                 }
86                 TAILQ_REMOVE(&sctp_it_ctl.iteratorhead, it, sctp_nxt_itr);
87                 SCTP_FREE(it, SCTP_M_ITER);
88         }
89 }
90
91
92 void
93 sctp_wakeup_iterator(void)
94 {
95         wakeup(&sctp_it_ctl.iterator_running);
96 }
97
98 static void
99 sctp_iterator_thread(void *v)
100 {
101         SCTP_IPI_ITERATOR_WQ_LOCK();
102         while (1) {
103                 msleep(&sctp_it_ctl.iterator_running,
104                     &sctp_it_ctl.ipi_iterator_wq_mtx,
105                     0, "waiting_for_work", 0);
106                 if (sctp_it_ctl.iterator_flags & SCTP_ITERATOR_MUST_EXIT) {
107                         SCTP_IPI_ITERATOR_WQ_DESTROY();
108                         SCTP_ITERATOR_LOCK_DESTROY();
109                         sctp_cleanup_itqueue();
110                         __sctp_thread_based_iterator_started = 0;
111                         kthread_exit();
112                 }
113                 sctp_iterator_worker();
114         }
115 }
116
117 void
118 sctp_startup_iterator(void)
119 {
120         if (__sctp_thread_based_iterator_started) {
121                 /* You only get one */
122                 return;
123         }
124         /* init the iterator head */
125         __sctp_thread_based_iterator_started = 1;
126         sctp_it_ctl.iterator_running = 0;
127         sctp_it_ctl.iterator_flags = 0;
128         sctp_it_ctl.cur_it = NULL;
129         SCTP_ITERATOR_LOCK_INIT();
130         SCTP_IPI_ITERATOR_WQ_INIT();
131         TAILQ_INIT(&sctp_it_ctl.iteratorhead);
132
133         int ret;
134
135         ret = kproc_create(sctp_iterator_thread,
136             (void *)NULL,
137             &sctp_it_ctl.thread_proc,
138             RFPROC,
139             SCTP_KTHREAD_PAGES,
140             SCTP_KTRHEAD_NAME);
141 }
142
143 #ifdef INET6
144
145 void
146 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
147 {
148         struct in6_ifaddr *ifa6;
149
150         ifa6 = (struct in6_ifaddr *)ifa->ifa;
151         ifa->flags = ifa6->ia6_flags;
152         if (!MODULE_GLOBAL(ip6_use_deprecated)) {
153                 if (ifa->flags &
154                     IN6_IFF_DEPRECATED) {
155                         ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
156                 } else {
157                         ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
158                 }
159         } else {
160                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
161         }
162         if (ifa->flags &
163             (IN6_IFF_DETACHED |
164             IN6_IFF_ANYCAST |
165             IN6_IFF_NOTREADY)) {
166                 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
167         } else {
168                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
169         }
170 }
171
172 #endif                          /* INET6 */
173
174
175 static uint32_t
176 sctp_is_desired_interface_type(struct ifaddr *ifa)
177 {
178         int result;
179
180         /* check the interface type to see if it's one we care about */
181         switch (ifa->ifa_ifp->if_type) {
182         case IFT_ETHER:
183         case IFT_ISO88023:
184         case IFT_ISO88024:
185         case IFT_ISO88025:
186         case IFT_ISO88026:
187         case IFT_STARLAN:
188         case IFT_P10:
189         case IFT_P80:
190         case IFT_HY:
191         case IFT_FDDI:
192         case IFT_XETHER:
193         case IFT_ISDNBASIC:
194         case IFT_ISDNPRIMARY:
195         case IFT_PTPSERIAL:
196         case IFT_OTHER:
197         case IFT_PPP:
198         case IFT_LOOP:
199         case IFT_SLIP:
200         case IFT_GIF:
201         case IFT_L2VLAN:
202         case IFT_IP:
203         case IFT_IPOVERCDLC:
204         case IFT_IPOVERCLAW:
205         case IFT_VIRTUALIPADDRESS:
206                 result = 1;
207                 break;
208         default:
209                 result = 0;
210         }
211
212         return (result);
213 }
214
215
216
217
218 static void
219 sctp_init_ifns_for_vrf(int vrfid)
220 {
221         /*
222          * Here we must apply ANY locks needed by the IFN we access and also
223          * make sure we lock any IFA that exists as we float through the
224          * list of IFA's
225          */
226         struct ifnet *ifn;
227         struct ifaddr *ifa;
228         struct in6_ifaddr *ifa6;
229         struct sctp_ifa *sctp_ifa;
230         uint32_t ifa_flags;
231
232         IFNET_RLOCK();
233         TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
234                 IF_ADDR_LOCK(ifn);
235                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
236                         if (ifa->ifa_addr == NULL) {
237                                 continue;
238                         }
239                         if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) {
240                                 /* non inet/inet6 skip */
241                                 continue;
242                         }
243                         if (ifa->ifa_addr->sa_family == AF_INET6) {
244                                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
245                                         /* skip unspecifed addresses */
246                                         continue;
247                                 }
248                         } else {
249                                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
250                                         continue;
251                                 }
252                         }
253                         if (sctp_is_desired_interface_type(ifa) == 0) {
254                                 /* non desired type */
255                                 continue;
256                         }
257                         if (ifa->ifa_addr->sa_family == AF_INET6) {
258                                 ifa6 = (struct in6_ifaddr *)ifa;
259                                 ifa_flags = ifa6->ia6_flags;
260                         } else {
261                                 ifa_flags = 0;
262                         }
263                         sctp_ifa = sctp_add_addr_to_vrf(vrfid,
264                             (void *)ifn,
265                             ifn->if_index,
266                             ifn->if_type,
267                             ifn->if_xname,
268                             (void *)ifa,
269                             ifa->ifa_addr,
270                             ifa_flags,
271                             0);
272                         if (sctp_ifa) {
273                                 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
274                         }
275                 }
276                 IF_ADDR_UNLOCK(ifn);
277         }
278         IFNET_RUNLOCK();
279 }
280
281 void
282 sctp_init_vrf_list(int vrfid)
283 {
284         if (vrfid > SCTP_MAX_VRF_ID)
285                 /* can't do that */
286                 return;
287
288         /* Don't care about return here */
289         (void)sctp_allocate_vrf(vrfid);
290
291         /*
292          * Now we need to build all the ifn's for this vrf and there
293          * addresses
294          */
295         sctp_init_ifns_for_vrf(vrfid);
296 }
297
298 void
299 sctp_addr_change(struct ifaddr *ifa, int cmd)
300 {
301         uint32_t ifa_flags = 0;
302
303         /*
304          * BSD only has one VRF, if this changes we will need to hook in the
305          * right things here to get the id to pass to the address managment
306          * routine.
307          */
308         if (SCTP_BASE_VAR(first_time) == 0) {
309                 /* Special test to see if my ::1 will showup with this */
310                 SCTP_BASE_VAR(first_time) = 1;
311                 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
312         }
313         if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
314                 /* don't know what to do with this */
315                 return;
316         }
317         if (ifa->ifa_addr == NULL) {
318                 return;
319         }
320         if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) {
321                 /* non inet/inet6 skip */
322                 return;
323         }
324         if (ifa->ifa_addr->sa_family == AF_INET6) {
325                 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
326                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
327                         /* skip unspecifed addresses */
328                         return;
329                 }
330         } else {
331                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
332                         return;
333                 }
334         }
335
336         if (sctp_is_desired_interface_type(ifa) == 0) {
337                 /* non desired type */
338                 return;
339         }
340         if (cmd == RTM_ADD) {
341                 (void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
342                     ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type,
343                     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_addrlist, ifa_list) {
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                 int siz;
388
389                 if (SCTP_BUF_IS_EXTENDED(m)) {
390                         siz = SCTP_BUF_EXTEND_SIZE(m);
391                 } else {
392                         if (want_header)
393                                 siz = MHLEN;
394                         else
395                                 siz = MLEN;
396                 }
397                 if (siz < space_needed) {
398                         m_freem(m);
399                         return (NULL);
400                 }
401         }
402         if (SCTP_BUF_NEXT(m)) {
403                 sctp_m_freem(SCTP_BUF_NEXT(m));
404                 SCTP_BUF_NEXT(m) = NULL;
405         }
406 #ifdef SCTP_MBUF_LOGGING
407         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
408                 if (SCTP_BUF_IS_EXTENDED(m)) {
409                         sctp_log_mb(m, SCTP_MBUF_IALLOC);
410                 }
411         }
412 #endif
413         return (m);
414 }
415
416
417 #ifdef SCTP_PACKET_LOGGING
418 void
419 sctp_packet_log(struct mbuf *m, int length)
420 {
421         int *lenat, thisone;
422         void *copyto;
423         uint32_t *tick_tock;
424         int total_len;
425         int grabbed_lock = 0;
426         int value, newval, thisend, thisbegin;
427
428         /*
429          * Buffer layout. -sizeof this entry (total_len) -previous end
430          * (value) -ticks of log      (ticks) o -ip packet o -as logged -
431          * where this started (thisbegin) x <--end points here
432          */
433         total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
434         /* Log a packet to the buffer. */
435         if (total_len > SCTP_PACKET_LOG_SIZE) {
436                 /* Can't log this packet I have not a buffer big enough */
437                 return;
438         }
439         if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
440                 return;
441         }
442         atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
443 try_again:
444         if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
445                 SCTP_IP_PKTLOG_LOCK();
446                 grabbed_lock = 1;
447 again_locked:
448                 value = SCTP_BASE_VAR(packet_log_end);
449                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
450                 if (newval >= SCTP_PACKET_LOG_SIZE) {
451                         /* we wrapped */
452                         thisbegin = 0;
453                         thisend = total_len;
454                 } else {
455                         thisbegin = SCTP_BASE_VAR(packet_log_end);
456                         thisend = newval;
457                 }
458                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
459                         goto again_locked;
460                 }
461         } else {
462                 value = SCTP_BASE_VAR(packet_log_end);
463                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
464                 if (newval >= SCTP_PACKET_LOG_SIZE) {
465                         /* we wrapped */
466                         thisbegin = 0;
467                         thisend = total_len;
468                 } else {
469                         thisbegin = SCTP_BASE_VAR(packet_log_end);
470                         thisend = newval;
471                 }
472                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
473                         goto try_again;
474                 }
475         }
476         /* Sanity check */
477         if (thisend >= SCTP_PACKET_LOG_SIZE) {
478                 printf("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
479                     thisbegin,
480                     thisend,
481                     SCTP_BASE_VAR(packet_log_writers),
482                     grabbed_lock,
483                     SCTP_BASE_VAR(packet_log_end));
484                 SCTP_BASE_VAR(packet_log_end) = 0;
485                 goto no_log;
486
487         }
488         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
489         *lenat = total_len;
490         lenat++;
491         *lenat = value;
492         lenat++;
493         tick_tock = (uint32_t *) lenat;
494         lenat++;
495         *tick_tock = sctp_get_tick_count();
496         copyto = (void *)lenat;
497         thisone = thisend - sizeof(int);
498         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
499         *lenat = thisbegin;
500         if (grabbed_lock) {
501                 SCTP_IP_PKTLOG_UNLOCK();
502                 grabbed_lock = 0;
503         }
504         m_copydata(m, 0, length, (caddr_t)copyto);
505 no_log:
506         if (grabbed_lock) {
507                 SCTP_IP_PKTLOG_UNLOCK();
508         }
509         atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
510 }
511
512
513 int
514 sctp_copy_out_packet_log(uint8_t * target, int length)
515 {
516         /*
517          * We wind through the packet log starting at start copying up to
518          * length bytes out. We return the number of bytes copied.
519          */
520         int tocopy, this_copy;
521         int *lenat;
522         int did_delay = 0;
523
524         tocopy = length;
525         if (length < (int)(2 * sizeof(int))) {
526                 /* not enough room */
527                 return (0);
528         }
529         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
530                 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
531 again:
532                 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
533                         /*
534                          * we delay here for just a moment hoping the
535                          * writer(s) that were present when we entered will
536                          * have left and we only have locking ones that will
537                          * contend with us for the lock. This does not
538                          * assure 100% access, but its good enough for a
539                          * logging facility like this.
540                          */
541                         did_delay = 1;
542                         DELAY(10);
543                         goto again;
544                 }
545         }
546         SCTP_IP_PKTLOG_LOCK();
547         lenat = (int *)target;
548         *lenat = SCTP_BASE_VAR(packet_log_end);
549         lenat++;
550         this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
551         memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
552         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
553                 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
554                     SCTP_PKTLOG_WRITERS_NEED_LOCK);
555         }
556         SCTP_IP_PKTLOG_UNLOCK();
557         return (this_copy + sizeof(int));
558 }
559
560 #endif