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: head/sys/netinet/sctp_bsd_addr.c 169208 2007-05-02 12:50:13Z 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#if defined(SCTP_USE_THREAD_BASED_ITERATOR)
53void
54sctp_wakeup_iterator(void)
55{
56 wakeup(&sctppcbinfo.iterator_running);
57}
58
59static void
60sctp_iterator_thread(void *v)
61{
62 SCTP_IPI_ITERATOR_WQ_LOCK();
63 sctppcbinfo.iterator_running = 0;
64 while (1) {
65 msleep(&sctppcbinfo.iterator_running,
66 &sctppcbinfo.ipi_iterator_wq_mtx,
67 0, "waiting_for_work", 0);
68 sctp_iterator_worker();
69 }
70}
71
72void
73sctp_startup_iterator(void)
74{
75 int ret;
76
77 ret = kthread_create(sctp_iterator_thread,
78 (void *)NULL,
79 &sctppcbinfo.thread_proc,
80 RFPROC,
81 SCTP_KTHREAD_PAGES,
82 SCTP_KTRHEAD_NAME);
83}
84
85#endif
86
87
88void
89sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
90{
91 struct in6_ifaddr *ifa6;
92
93 ifa6 = (struct in6_ifaddr *)ifa->ifa;
94 ifa->flags = ifa6->ia6_flags;
95 if (!ip6_use_deprecated) {
96 if (ifa->flags &
97 IN6_IFF_DEPRECATED) {
98 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
99 } else {
100 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
101 }
102 } else {
103 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
104 }
105 if (ifa->flags &
106 (IN6_IFF_DETACHED |
107 IN6_IFF_ANYCAST |
108 IN6_IFF_NOTREADY)) {
109 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
110 } else {
111 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
112 }
113}
114
115
116
117static uint32_t
118sctp_is_desired_interface_type(struct ifaddr *ifa)
119{
120 int result;
121
122 /* check the interface type to see if it's one we care about */
123 switch (ifa->ifa_ifp->if_type) {
124 case IFT_ETHER:
125 case IFT_ISO88023:
126 case IFT_ISO88024:
127 case IFT_ISO88025:
128 case IFT_ISO88026:
129 case IFT_STARLAN:
130 case IFT_P10:
131 case IFT_P80:
132 case IFT_HY:
133 case IFT_FDDI:
134 case IFT_XETHER:
135 case IFT_ISDNBASIC:
136 case IFT_ISDNPRIMARY:
137 case IFT_PTPSERIAL:
138 case IFT_PPP:
139 case IFT_LOOP:
140 case IFT_SLIP:
141 case IFT_IP:
142 case IFT_IPOVERCDLC:
143 case IFT_IPOVERCLAW:
144 case IFT_VIRTUALIPADDRESS:
145 result = 1;
146 break;
147 default:
148 result = 0;
149 }
150
151 return (result);
152}
153
154static void
155sctp_init_ifns_for_vrf(int vrfid)
156{
157 /*
158 * Here we must apply ANY locks needed by the IFN we access and also
159 * make sure we lock any IFA that exists as we float through the
160 * list of IFA's
161 */
162 struct ifnet *ifn;
163 struct ifaddr *ifa;
164 struct in6_ifaddr *ifa6;
165 struct sctp_ifa *sctp_ifa;
166 uint32_t ifa_flags;
167
168 TAILQ_FOREACH(ifn, &ifnet, if_list) {
169 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
170 if (ifa->ifa_addr == NULL) {
171 continue;
172 }
173 if ((ifa->ifa_addr->sa_family != AF_INET) &&
174 (ifa->ifa_addr->sa_family != AF_INET6)
175 ) {
176 /* non inet/inet6 skip */
177 continue;
178 }
179 if (ifa->ifa_addr->sa_family == AF_INET6) {
180 ifa6 = (struct in6_ifaddr *)ifa;
181 ifa_flags = ifa6->ia6_flags;
182 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
183 /* skip unspecifed addresses */
184 continue;
185 }
186 } else if (ifa->ifa_addr->sa_family == AF_INET) {
187 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
188 continue;
189 }
190 }
191 if (sctp_is_desired_interface_type(ifa) == 0) {
192 /* non desired type */
193 continue;
194 }
195 if ((ifa->ifa_addr->sa_family == AF_INET6) ||
196 (ifa->ifa_addr->sa_family == AF_INET)) {
197 if (ifa->ifa_addr->sa_family == AF_INET6) {
198 ifa6 = (struct in6_ifaddr *)ifa;
199 ifa_flags = ifa6->ia6_flags;
200 } else {
201 ifa_flags = 0;
202 }
203 sctp_ifa = sctp_add_addr_to_vrf(vrfid,
204 (void *)ifn,
205 ifn->if_index,
206 ifn->if_type,
207 ifn->if_xname,
208 (void *)ifa,
209 ifa->ifa_addr,
210 ifa_flags, 0
211 );
212 if (sctp_ifa) {
213 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
214 }
215 }
216 }
217 }
218}
219
220
221void
222sctp_init_vrf_list(int vrfid)
223{
224 if (vrfid > SCTP_MAX_VRF_ID)
225 /* can't do that */
226 return;
227
228 /* Don't care about return here */
229 (void)sctp_allocate_vrf(vrfid);
230
231 /*
232 * Now we need to build all the ifn's for this vrf and there
233 * addresses
234 */
235 sctp_init_ifns_for_vrf(vrfid);
236}
237
238static uint8_t first_time = 0;
239
240
241void
242sctp_addr_change(struct ifaddr *ifa, int cmd)
243{
244 struct sctp_ifa *ifap = NULL;
245 uint32_t ifa_flags = 0;
246 struct in6_ifaddr *ifa6;
247
248 /*
249 * BSD only has one VRF, if this changes we will need to hook in the
250 * right things here to get the id to pass to the address managment
251 * routine.
252 */
253 if (first_time == 0) {
254 /* Special test to see if my ::1 will showup with this */
255 first_time = 1;
256 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
257 }
258 if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
259 /* don't know what to do with this */
260 return;
261 }
262 if (ifa->ifa_addr == NULL) {
263 return;
264 }
265 if ((ifa->ifa_addr->sa_family != AF_INET) &&
266 (ifa->ifa_addr->sa_family != AF_INET6)
267 ) {
268 /* non inet/inet6 skip */
269 return;
270 }
271 if (ifa->ifa_addr->sa_family == AF_INET6) {
272 ifa6 = (struct in6_ifaddr *)ifa;
273 ifa_flags = ifa6->ia6_flags;
274 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
275 /* skip unspecifed addresses */
276 return;
277 }
278 } else if (ifa->ifa_addr->sa_family == AF_INET) {
279 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
280 return;
281 }
282 }
283 if (sctp_is_desired_interface_type(ifa) == 0) {
284 /* non desired type */
285 return;
286 }
287 if (cmd == RTM_ADD) {
288 ifap = sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
289 ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type,
290 ifa->ifa_ifp->if_xname,
291 (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
292
293 } else if (cmd == RTM_DELETE) {
294
295 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr, ifa->ifa_ifp->if_index);
296 /*
297 * We don't bump refcount here so when it completes the
298 * final delete will happen.
299 */
300 }
301}
302
303struct mbuf *
304sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
305 int how, int allonebuf, int type)
306{
307 struct mbuf *m = NULL;
308
309 m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
310 if (m == NULL) {
311 /* bad, no memory */
312 return (m);
313 }
314 if (allonebuf) {
315 int siz;
316
317 if (SCTP_BUF_IS_EXTENDED(m)) {
318 siz = SCTP_BUF_EXTEND_SIZE(m);
319 } else {
320 if (want_header)
321 siz = MHLEN;
322 else
323 siz = MLEN;
324 }
325 if (siz < space_needed) {
326 m_freem(m);
327 return (NULL);
328 }
329 }
330 if (SCTP_BUF_NEXT(m)) {
331 sctp_m_freem(SCTP_BUF_NEXT(m));
332 SCTP_BUF_NEXT(m) = NULL;
333 }
334#ifdef SCTP_MBUF_LOGGING
335 if (SCTP_BUF_IS_EXTENDED(m)) {
336 sctp_log_mb(m, SCTP_MBUF_IALLOC);
337 }
338#endif
339 return (m);
340}
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: head/sys/netinet/sctp_bsd_addr.c 169208 2007-05-02 12:50:13Z 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#if defined(SCTP_USE_THREAD_BASED_ITERATOR)
53void
54sctp_wakeup_iterator(void)
55{
56 wakeup(&sctppcbinfo.iterator_running);
57}
58
59static void
60sctp_iterator_thread(void *v)
61{
62 SCTP_IPI_ITERATOR_WQ_LOCK();
63 sctppcbinfo.iterator_running = 0;
64 while (1) {
65 msleep(&sctppcbinfo.iterator_running,
66 &sctppcbinfo.ipi_iterator_wq_mtx,
67 0, "waiting_for_work", 0);
68 sctp_iterator_worker();
69 }
70}
71
72void
73sctp_startup_iterator(void)
74{
75 int ret;
76
77 ret = kthread_create(sctp_iterator_thread,
78 (void *)NULL,
79 &sctppcbinfo.thread_proc,
80 RFPROC,
81 SCTP_KTHREAD_PAGES,
82 SCTP_KTRHEAD_NAME);
83}
84
85#endif
86
87
88void
89sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)
90{
91 struct in6_ifaddr *ifa6;
92
93 ifa6 = (struct in6_ifaddr *)ifa->ifa;
94 ifa->flags = ifa6->ia6_flags;
95 if (!ip6_use_deprecated) {
96 if (ifa->flags &
97 IN6_IFF_DEPRECATED) {
98 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
99 } else {
100 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
101 }
102 } else {
103 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
104 }
105 if (ifa->flags &
106 (IN6_IFF_DETACHED |
107 IN6_IFF_ANYCAST |
108 IN6_IFF_NOTREADY)) {
109 ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;
110 } else {
111 ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;
112 }
113}
114
115
116
117static uint32_t
118sctp_is_desired_interface_type(struct ifaddr *ifa)
119{
120 int result;
121
122 /* check the interface type to see if it's one we care about */
123 switch (ifa->ifa_ifp->if_type) {
124 case IFT_ETHER:
125 case IFT_ISO88023:
126 case IFT_ISO88024:
127 case IFT_ISO88025:
128 case IFT_ISO88026:
129 case IFT_STARLAN:
130 case IFT_P10:
131 case IFT_P80:
132 case IFT_HY:
133 case IFT_FDDI:
134 case IFT_XETHER:
135 case IFT_ISDNBASIC:
136 case IFT_ISDNPRIMARY:
137 case IFT_PTPSERIAL:
138 case IFT_PPP:
139 case IFT_LOOP:
140 case IFT_SLIP:
141 case IFT_IP:
142 case IFT_IPOVERCDLC:
143 case IFT_IPOVERCLAW:
144 case IFT_VIRTUALIPADDRESS:
145 result = 1;
146 break;
147 default:
148 result = 0;
149 }
150
151 return (result);
152}
153
154static void
155sctp_init_ifns_for_vrf(int vrfid)
156{
157 /*
158 * Here we must apply ANY locks needed by the IFN we access and also
159 * make sure we lock any IFA that exists as we float through the
160 * list of IFA's
161 */
162 struct ifnet *ifn;
163 struct ifaddr *ifa;
164 struct in6_ifaddr *ifa6;
165 struct sctp_ifa *sctp_ifa;
166 uint32_t ifa_flags;
167
168 TAILQ_FOREACH(ifn, &ifnet, if_list) {
169 TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
170 if (ifa->ifa_addr == NULL) {
171 continue;
172 }
173 if ((ifa->ifa_addr->sa_family != AF_INET) &&
174 (ifa->ifa_addr->sa_family != AF_INET6)
175 ) {
176 /* non inet/inet6 skip */
177 continue;
178 }
179 if (ifa->ifa_addr->sa_family == AF_INET6) {
180 ifa6 = (struct in6_ifaddr *)ifa;
181 ifa_flags = ifa6->ia6_flags;
182 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
183 /* skip unspecifed addresses */
184 continue;
185 }
186 } else if (ifa->ifa_addr->sa_family == AF_INET) {
187 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
188 continue;
189 }
190 }
191 if (sctp_is_desired_interface_type(ifa) == 0) {
192 /* non desired type */
193 continue;
194 }
195 if ((ifa->ifa_addr->sa_family == AF_INET6) ||
196 (ifa->ifa_addr->sa_family == AF_INET)) {
197 if (ifa->ifa_addr->sa_family == AF_INET6) {
198 ifa6 = (struct in6_ifaddr *)ifa;
199 ifa_flags = ifa6->ia6_flags;
200 } else {
201 ifa_flags = 0;
202 }
203 sctp_ifa = sctp_add_addr_to_vrf(vrfid,
204 (void *)ifn,
205 ifn->if_index,
206 ifn->if_type,
207 ifn->if_xname,
208 (void *)ifa,
209 ifa->ifa_addr,
210 ifa_flags, 0
211 );
212 if (sctp_ifa) {
213 sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
214 }
215 }
216 }
217 }
218}
219
220
221void
222sctp_init_vrf_list(int vrfid)
223{
224 if (vrfid > SCTP_MAX_VRF_ID)
225 /* can't do that */
226 return;
227
228 /* Don't care about return here */
229 (void)sctp_allocate_vrf(vrfid);
230
231 /*
232 * Now we need to build all the ifn's for this vrf and there
233 * addresses
234 */
235 sctp_init_ifns_for_vrf(vrfid);
236}
237
238static uint8_t first_time = 0;
239
240
241void
242sctp_addr_change(struct ifaddr *ifa, int cmd)
243{
244 struct sctp_ifa *ifap = NULL;
245 uint32_t ifa_flags = 0;
246 struct in6_ifaddr *ifa6;
247
248 /*
249 * BSD only has one VRF, if this changes we will need to hook in the
250 * right things here to get the id to pass to the address managment
251 * routine.
252 */
253 if (first_time == 0) {
254 /* Special test to see if my ::1 will showup with this */
255 first_time = 1;
256 sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);
257 }
258 if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {
259 /* don't know what to do with this */
260 return;
261 }
262 if (ifa->ifa_addr == NULL) {
263 return;
264 }
265 if ((ifa->ifa_addr->sa_family != AF_INET) &&
266 (ifa->ifa_addr->sa_family != AF_INET6)
267 ) {
268 /* non inet/inet6 skip */
269 return;
270 }
271 if (ifa->ifa_addr->sa_family == AF_INET6) {
272 ifa6 = (struct in6_ifaddr *)ifa;
273 ifa_flags = ifa6->ia6_flags;
274 if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {
275 /* skip unspecifed addresses */
276 return;
277 }
278 } else if (ifa->ifa_addr->sa_family == AF_INET) {
279 if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {
280 return;
281 }
282 }
283 if (sctp_is_desired_interface_type(ifa) == 0) {
284 /* non desired type */
285 return;
286 }
287 if (cmd == RTM_ADD) {
288 ifap = sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,
289 ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type,
290 ifa->ifa_ifp->if_xname,
291 (void *)ifa, ifa->ifa_addr, ifa_flags, 1);
292
293 } else if (cmd == RTM_DELETE) {
294
295 sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr, ifa->ifa_ifp->if_index);
296 /*
297 * We don't bump refcount here so when it completes the
298 * final delete will happen.
299 */
300 }
301}
302
303struct mbuf *
304sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
305 int how, int allonebuf, int type)
306{
307 struct mbuf *m = NULL;
308
309 m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
310 if (m == NULL) {
311 /* bad, no memory */
312 return (m);
313 }
314 if (allonebuf) {
315 int siz;
316
317 if (SCTP_BUF_IS_EXTENDED(m)) {
318 siz = SCTP_BUF_EXTEND_SIZE(m);
319 } else {
320 if (want_header)
321 siz = MHLEN;
322 else
323 siz = MLEN;
324 }
325 if (siz < space_needed) {
326 m_freem(m);
327 return (NULL);
328 }
329 }
330 if (SCTP_BUF_NEXT(m)) {
331 sctp_m_freem(SCTP_BUF_NEXT(m));
332 SCTP_BUF_NEXT(m) = NULL;
333 }
334#ifdef SCTP_MBUF_LOGGING
335 if (SCTP_BUF_IS_EXTENDED(m)) {
336 sctp_log_mb(m, SCTP_MBUF_IALLOC);
337 }
338#endif
339 return (m);
340}