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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         struct sctp_ifa *ifap = NULL;
302         uint32_t ifa_flags = 0;
303
304         /*
305          * BSD only has one VRF, if this changes we will need to hook in the
306          * right things here to get the id to pass to the address managment
307          * routine.
308          */
309         if (SCTP_BASE_VAR(first_time) == 0) {
310                 /* Special test to see if my ::1 will showup with this */
311                 SCTP_BASE_VAR(first_time) = 1;
312                 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
313         }
314         if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
315                 /* don't know what to do with this */
316                 return;
317         }
318         if (ifa->ifa_addr == NULL) {
319                 return;
320         }
321         if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) {
322                 /* non inet/inet6 skip */
323                 return;
324         }
325         if (ifa->ifa_addr->sa_family == AF_INET6) {
326                 ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;
327                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
328                         /* skip unspecifed addresses */
329                         return;
330                 }
331         } else {
332                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
333                         return;
334                 }
335         }
336
337         if (sctp_is_desired_interface_type(ifa) == 0) {
338                 /* non desired type */
339                 return;
340         }
341         if (cmd == RTM_ADD) {
342                 ifap = sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
343                     ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type,
344                     ifa->ifa_ifp->if_xname,
345                     (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
346         } else {
347
348                 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,
349                     ifa->ifa_ifp->if_index,
350                     ifa->ifa_ifp->if_xname
351                     );
352                 /*
353                  * We don't bump refcount here so when it completes the
354                  * final delete will happen.
355                  */
356         }
357 }
358
359 void
360      sctp_add_or_del_interfaces(int (*pred) (struct ifnet *), int add){
361         struct ifnet *ifn;
362         struct ifaddr *ifa;
363
364         IFNET_RLOCK();
365         TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {
366                 if (!(*pred) (ifn)) {
367                         continue;
368                 }
369                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
370                         sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE);
371                 }
372         }
373         IFNET_RUNLOCK();
374 }
375
376 struct mbuf *
377 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
378     int how, int allonebuf, int type)
379 {
380         struct mbuf *m = NULL;
381
382         m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
383         if (m == NULL) {
384                 /* bad, no memory */
385                 return (m);
386         }
387         if (allonebuf) {
388                 int siz;
389
390                 if (SCTP_BUF_IS_EXTENDED(m)) {
391                         siz = SCTP_BUF_EXTEND_SIZE(m);
392                 } else {
393                         if (want_header)
394                                 siz = MHLEN;
395                         else
396                                 siz = MLEN;
397                 }
398                 if (siz < space_needed) {
399                         m_freem(m);
400                         return (NULL);
401                 }
402         }
403         if (SCTP_BUF_NEXT(m)) {
404                 sctp_m_freem(SCTP_BUF_NEXT(m));
405                 SCTP_BUF_NEXT(m) = NULL;
406         }
407 #ifdef SCTP_MBUF_LOGGING
408         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
409                 if (SCTP_BUF_IS_EXTENDED(m)) {
410                         sctp_log_mb(m, SCTP_MBUF_IALLOC);
411                 }
412         }
413 #endif
414         return (m);
415 }
416
417
418 #ifdef SCTP_PACKET_LOGGING
419 void
420 sctp_packet_log(struct mbuf *m, int length)
421 {
422         int *lenat, thisone;
423         void *copyto;
424         uint32_t *tick_tock;
425         int total_len;
426         int grabbed_lock = 0;
427         int value, newval, thisend, thisbegin;
428
429         /*
430          * Buffer layout. -sizeof this entry (total_len) -previous end
431          * (value) -ticks of log      (ticks) o -ip packet o -as logged -
432          * where this started (thisbegin) x <--end points here
433          */
434         total_len = SCTP_SIZE32((length + (4 * sizeof(int))));
435         /* Log a packet to the buffer. */
436         if (total_len > SCTP_PACKET_LOG_SIZE) {
437                 /* Can't log this packet I have not a buffer big enough */
438                 return;
439         }
440         if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {
441                 return;
442         }
443         atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);
444 try_again:
445         if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {
446                 SCTP_IP_PKTLOG_LOCK();
447                 grabbed_lock = 1;
448 again_locked:
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 again_locked;
461                 }
462         } else {
463                 value = SCTP_BASE_VAR(packet_log_end);
464                 newval = SCTP_BASE_VAR(packet_log_end) + total_len;
465                 if (newval >= SCTP_PACKET_LOG_SIZE) {
466                         /* we wrapped */
467                         thisbegin = 0;
468                         thisend = total_len;
469                 } else {
470                         thisbegin = SCTP_BASE_VAR(packet_log_end);
471                         thisend = newval;
472                 }
473                 if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {
474                         goto try_again;
475                 }
476         }
477         /* Sanity check */
478         if (thisend >= SCTP_PACKET_LOG_SIZE) {
479                 printf("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",
480                     thisbegin,
481                     thisend,
482                     SCTP_BASE_VAR(packet_log_writers),
483                     grabbed_lock,
484                     SCTP_BASE_VAR(packet_log_end));
485                 SCTP_BASE_VAR(packet_log_end) = 0;
486                 goto no_log;
487
488         }
489         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];
490         *lenat = total_len;
491         lenat++;
492         *lenat = value;
493         lenat++;
494         tick_tock = (uint32_t *) lenat;
495         lenat++;
496         *tick_tock = sctp_get_tick_count();
497         copyto = (void *)lenat;
498         thisone = thisend - sizeof(int);
499         lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];
500         *lenat = thisbegin;
501         if (grabbed_lock) {
502                 SCTP_IP_PKTLOG_UNLOCK();
503                 grabbed_lock = 0;
504         }
505         m_copydata(m, 0, length, (caddr_t)copyto);
506 no_log:
507         if (grabbed_lock) {
508                 SCTP_IP_PKTLOG_UNLOCK();
509         }
510         atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);
511 }
512
513
514 int
515 sctp_copy_out_packet_log(uint8_t * target, int length)
516 {
517         /*
518          * We wind through the packet log starting at start copying up to
519          * length bytes out. We return the number of bytes copied.
520          */
521         int tocopy, this_copy;
522         int *lenat;
523         int did_delay = 0;
524
525         tocopy = length;
526         if (length < (int)(2 * sizeof(int))) {
527                 /* not enough room */
528                 return (0);
529         }
530         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
531                 atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);
532 again:
533                 if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {
534                         /*
535                          * we delay here for just a moment hoping the
536                          * writer(s) that were present when we entered will
537                          * have left and we only have locking ones that will
538                          * contend with us for the lock. This does not
539                          * assure 100% access, but its good enough for a
540                          * logging facility like this.
541                          */
542                         did_delay = 1;
543                         DELAY(10);
544                         goto again;
545                 }
546         }
547         SCTP_IP_PKTLOG_LOCK();
548         lenat = (int *)target;
549         *lenat = SCTP_BASE_VAR(packet_log_end);
550         lenat++;
551         this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);
552         memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);
553         if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {
554                 atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),
555                     SCTP_PKTLOG_WRITERS_NEED_LOCK);
556         }
557         SCTP_IP_PKTLOG_UNLOCK();
558         return (this_copy + sizeof(int));
559 }
560
561 #endif