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1 /*-
2  * Copyright (c) 2001-2007, 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_indata.h>
48 #include <sys/unistd.h>
49
50 #ifdef SCTP_DEBUG
51 extern uint32_t sctp_debug_on;
52
53 #endif
54
55
56 #if defined(SCTP_USE_THREAD_BASED_ITERATOR)
57 void
58 sctp_wakeup_iterator(void)
59 {
60         wakeup(&sctppcbinfo.iterator_running);
61 }
62
63 static void
64 sctp_iterator_thread(void *v)
65 {
66         SCTP_IPI_ITERATOR_WQ_LOCK();
67         sctppcbinfo.iterator_running = 0;
68         while (1) {
69                 msleep(&sctppcbinfo.iterator_running,
70                     &sctppcbinfo.ipi_iterator_wq_mtx,
71                     0, "waiting_for_work", 0);
72                 sctp_iterator_worker();
73         }
74 }
75
76 void
77 sctp_startup_iterator(void)
78 {
79         int ret;
80
81         ret = kthread_create(sctp_iterator_thread,
82             (void *)NULL,
83             &sctppcbinfo.thread_proc,
84             RFPROC,
85             SCTP_KTHREAD_PAGES,
86             SCTP_KTRHEAD_NAME);
87 }
88
89 #endif
90
91
92 void
93 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
94 {
95         struct in6_ifaddr *ifa6;
96
97         ifa6 = (struct in6_ifaddr *)ifa->ifa;
98         ifa->flags = ifa6->ia6_flags;
99         if (!ip6_use_deprecated) {
100                 if (ifa->flags &
101                     IN6_IFF_DEPRECATED) {
102                         ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
103                 } else {
104                         ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
105                 }
106         } else {
107                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
108         }
109         if (ifa->flags &
110             (IN6_IFF_DETACHED |
111             IN6_IFF_ANYCAST |
112             IN6_IFF_NOTREADY)) {
113                 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
114         } else {
115                 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
116         }
117 }
118
119
120
121 static uint32_t
122 sctp_is_desired_interface_type(struct ifaddr *ifa)
123 {
124         int result;
125
126         /* check the interface type to see if it's one we care about */
127         switch (ifa->ifa_ifp->if_type) {
128         case IFT_ETHER:
129         case IFT_ISO88023:
130         case IFT_ISO88024:
131         case IFT_ISO88025:
132         case IFT_ISO88026:
133         case IFT_STARLAN:
134         case IFT_P10:
135         case IFT_P80:
136         case IFT_HY:
137         case IFT_FDDI:
138         case IFT_XETHER:
139         case IFT_ISDNBASIC:
140         case IFT_ISDNPRIMARY:
141         case IFT_PTPSERIAL:
142         case IFT_PPP:
143         case IFT_LOOP:
144         case IFT_SLIP:
145         case IFT_IP:
146         case IFT_IPOVERCDLC:
147         case IFT_IPOVERCLAW:
148         case IFT_VIRTUALIPADDRESS:
149                 result = 1;
150                 break;
151         default:
152                 result = 0;
153         }
154
155         return (result);
156 }
157
158 static void
159 sctp_init_ifns_for_vrf(int vrfid)
160 {
161         /*
162          * Here we must apply ANY locks needed by the IFN we access and also
163          * make sure we lock any IFA that exists as we float through the
164          * list of IFA's
165          */
166         struct ifnet *ifn;
167         struct ifaddr *ifa;
168         struct in6_ifaddr *ifa6;
169         struct sctp_ifa *sctp_ifa;
170         uint32_t ifa_flags;
171
172         TAILQ_FOREACH(ifn, &ifnet, if_list) {
173                 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
174                         if (ifa->ifa_addr == NULL) {
175                                 continue;
176                         }
177                         if ((ifa->ifa_addr->sa_family != AF_INET) &&
178                             (ifa->ifa_addr->sa_family != AF_INET6)
179                             ) {
180                                 /* non inet/inet6 skip */
181                                 continue;
182                         }
183                         if (ifa->ifa_addr->sa_family == AF_INET6) {
184                                 ifa6 = (struct in6_ifaddr *)ifa;
185                                 ifa_flags = ifa6->ia6_flags;
186                                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
187                                         /* skip unspecifed addresses */
188                                         continue;
189                                 }
190                         } else if (ifa->ifa_addr->sa_family == AF_INET) {
191                                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
192                                         continue;
193                                 }
194                         }
195                         if (sctp_is_desired_interface_type(ifa) == 0) {
196                                 /* non desired type */
197                                 continue;
198                         }
199                         if ((ifa->ifa_addr->sa_family == AF_INET6) ||
200                             (ifa->ifa_addr->sa_family == AF_INET)) {
201                                 if (ifa->ifa_addr->sa_family == AF_INET6) {
202                                         ifa6 = (struct in6_ifaddr *)ifa;
203                                         ifa_flags = ifa6->ia6_flags;
204                                 } else {
205                                         ifa_flags = 0;
206                                 }
207                                 sctp_ifa = sctp_add_addr_to_vrf(vrfid,
208                                     (void *)ifn,
209                                     ifn->if_index,
210                                     ifn->if_type,
211                                     ifn->if_xname,
212                                     (void *)ifa,
213                                     ifa->ifa_addr,
214                                     ifa_flags
215                                     );
216                                 if (sctp_ifa) {
217                                         sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
218                                 }
219                         }
220                 }
221         }
222 }
223
224
225 void
226 sctp_init_vrf_list(int vrfid)
227 {
228         if (vrfid > SCTP_MAX_VRF_ID)
229                 /* can't do that */
230                 return;
231
232         /* Don't care about return here */
233         (void)sctp_allocate_vrf(vrfid);
234
235         /*
236          * Now we need to build all the ifn's for this vrf and there
237          * addresses
238          */
239         sctp_init_ifns_for_vrf(vrfid);
240 }
241
242 static uint8_t first_time = 0;
243
244
245 void
246 sctp_addr_change(struct ifaddr *ifa, int cmd)
247 {
248         struct sctp_laddr *wi;
249         struct sctp_ifa *ifap = NULL;
250         uint32_t ifa_flags = 0;
251         struct in6_ifaddr *ifa6;
252
253         /*
254          * BSD only has one VRF, if this changes we will need to hook in the
255          * right things here to get the id to pass to the address managment
256          * routine.
257          */
258         if (first_time == 0) {
259                 /* Special test to see if my ::1 will showup with this */
260                 first_time = 1;
261                 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
262         }
263         if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
264                 /* don't know what to do with this */
265                 return;
266         }
267         if (ifa->ifa_addr == NULL) {
268                 return;
269         }
270         if ((ifa->ifa_addr->sa_family != AF_INET) &&
271             (ifa->ifa_addr->sa_family != AF_INET6)
272             ) {
273                 /* non inet/inet6 skip */
274                 return;
275         }
276         if (ifa->ifa_addr->sa_family == AF_INET6) {
277                 ifa6 = (struct in6_ifaddr *)ifa;
278                 ifa_flags = ifa6->ia6_flags;
279                 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
280                         /* skip unspecifed addresses */
281                         return;
282                 }
283         } else if (ifa->ifa_addr->sa_family == AF_INET) {
284                 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
285                         return;
286                 }
287         }
288         if (sctp_is_desired_interface_type(ifa) == 0) {
289                 /* non desired type */
290                 return;
291         }
292         if (cmd == RTM_ADD) {
293                 ifap = sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
294                     ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type,
295                     ifa->ifa_ifp->if_xname,
296                     (void *)ifa, ifa->ifa_addr, ifa_flags);
297                 /*
298                  * Bump up the refcount so that when the timer completes it
299                  * will drop back down.
300                  */
301                 if (ifap)
302                         atomic_add_int(&ifap->refcount, 1);
303
304         } else if (cmd == RTM_DELETE) {
305
306                 ifap = sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr, ifa->ifa_ifp->if_index);
307                 /*
308                  * We don't bump refcount here so when it completes the
309                  * final delete will happen.
310                  */
311         }
312         if (ifap == NULL)
313                 return;
314
315         wi = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_laddr, struct sctp_laddr);
316         if (wi == NULL) {
317                 /*
318                  * Gak, what can we do? We have lost an address change can
319                  * you say HOSED?
320                  */
321 #ifdef SCTP_DEBUG
322                 if (sctp_debug_on & SCTP_DEBUG_PCB1) {
323                         printf("Lost and address change ???\n");
324                 }
325 #endif                          /* SCTP_DEBUG */
326
327                 /* Opps, must decrement the count */
328                 sctp_free_ifa(ifap);
329                 return;
330         }
331         SCTP_INCR_LADDR_COUNT();
332         bzero(wi, sizeof(*wi));
333         wi->ifa = ifap;
334         if (cmd == RTM_ADD) {
335                 wi->action = SCTP_ADD_IP_ADDRESS;
336         } else if (cmd == RTM_DELETE) {
337                 wi->action = SCTP_DEL_IP_ADDRESS;
338         }
339         SCTP_IPI_ITERATOR_WQ_LOCK();
340         /*
341          * Should this really be a tailq? As it is we will process the
342          * newest first :-0
343          */
344         LIST_INSERT_HEAD(&sctppcbinfo.addr_wq, wi, sctp_nxt_addr);
345         sctp_timer_start(SCTP_TIMER_TYPE_ADDR_WQ,
346             (struct sctp_inpcb *)NULL,
347             (struct sctp_tcb *)NULL,
348             (struct sctp_nets *)NULL);
349         SCTP_IPI_ITERATOR_WQ_UNLOCK();
350 }