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1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2003, 2004
3 *
4 * This file is part of the SCTP kernel implementation
5 *
6 * This file contains the code relating the chunk abstraction.
7 *
8 * This SCTP implementation is free software;
9 * you can redistribute it and/or modify it under the terms of
10 * the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
12 * any later version.
13 *
14 * This SCTP implementation is distributed in the hope that it
15 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
16 * ************************
17 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
18 * See the GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with GNU CC; see the file COPYING. If not, see
22 * <http://www.gnu.org/licenses/>.
23 *
24 * Please send any bug reports or fixes you make to the
25 * email address(es):
26 * lksctp developers <linux-sctp@vger.kernel.org>
27 *
28 * Written or modified by:
29 * Jon Grimm <jgrimm@us.ibm.com>
30 * Sridhar Samudrala <sri@us.ibm.com>
31 */
32
33#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
34
35#include <linux/types.h>
36#include <linux/kernel.h>
37#include <linux/net.h>
38#include <linux/inet.h>
39#include <linux/skbuff.h>
40#include <linux/slab.h>
41#include <net/sock.h>
42#include <net/sctp/sctp.h>
43#include <net/sctp/sm.h>
44
45/* This file is mostly in anticipation of future work, but initially
46 * populate with fragment tracking for an outbound message.
47 */
48
49/* Initialize datamsg from memory. */
50static void sctp_datamsg_init(struct sctp_datamsg *msg)
51{
52 atomic_set(&msg->refcnt, 1);
53 msg->send_failed = 0;
54 msg->send_error = 0;
55 msg->can_abandon = 0;
56 msg->can_delay = 1;
57 msg->expires_at = 0;
58 INIT_LIST_HEAD(&msg->chunks);
59}
60
61/* Allocate and initialize datamsg. */
62static struct sctp_datamsg *sctp_datamsg_new(gfp_t gfp)
63{
64 struct sctp_datamsg *msg;
65 msg = kmalloc(sizeof(struct sctp_datamsg), gfp);
66 if (msg) {
67 sctp_datamsg_init(msg);
68 SCTP_DBG_OBJCNT_INC(datamsg);
69 }
70 return msg;
71}
72
73void sctp_datamsg_free(struct sctp_datamsg *msg)
74{
75 struct sctp_chunk *chunk;
76
77 /* This doesn't have to be a _safe vairant because
78 * sctp_chunk_free() only drops the refs.
79 */
80 list_for_each_entry(chunk, &msg->chunks, frag_list)
81 sctp_chunk_free(chunk);
82
83 sctp_datamsg_put(msg);
84}
85
86/* Final destructruction of datamsg memory. */
87static void sctp_datamsg_destroy(struct sctp_datamsg *msg)
88{
89 struct list_head *pos, *temp;
90 struct sctp_chunk *chunk;
91 struct sctp_sock *sp;
92 struct sctp_ulpevent *ev;
93 struct sctp_association *asoc = NULL;
94 int error = 0, notify;
95
96 /* If we failed, we may need to notify. */
97 notify = msg->send_failed ? -1 : 0;
98
99 /* Release all references. */
100 list_for_each_safe(pos, temp, &msg->chunks) {
101 list_del_init(pos);
102 chunk = list_entry(pos, struct sctp_chunk, frag_list);
103 /* Check whether we _really_ need to notify. */
104 if (notify < 0) {
105 asoc = chunk->asoc;
106 if (msg->send_error)
107 error = msg->send_error;
108 else
109 error = asoc->outqueue.error;
110
111 sp = sctp_sk(asoc->base.sk);
112 notify = sctp_ulpevent_type_enabled(SCTP_SEND_FAILED,
113 &sp->subscribe);
114 }
115
116 /* Generate a SEND FAILED event only if enabled. */
117 if (notify > 0) {
118 int sent;
119 if (chunk->has_tsn)
120 sent = SCTP_DATA_SENT;
121 else
122 sent = SCTP_DATA_UNSENT;
123
124 ev = sctp_ulpevent_make_send_failed(asoc, chunk, sent,
125 error, GFP_ATOMIC);
126 if (ev)
127 sctp_ulpq_tail_event(&asoc->ulpq, ev);
128 }
129
130 sctp_chunk_put(chunk);
131 }
132
133 SCTP_DBG_OBJCNT_DEC(datamsg);
134 kfree(msg);
135}
136
137/* Hold a reference. */
138static void sctp_datamsg_hold(struct sctp_datamsg *msg)
139{
140 atomic_inc(&msg->refcnt);
141}
142
143/* Release a reference. */
144void sctp_datamsg_put(struct sctp_datamsg *msg)
145{
146 if (atomic_dec_and_test(&msg->refcnt))
147 sctp_datamsg_destroy(msg);
148}
149
150/* Assign a chunk to this datamsg. */
151static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chunk)
152{
153 sctp_datamsg_hold(msg);
154 chunk->msg = msg;
155}
156
157
158/* A data chunk can have a maximum payload of (2^16 - 20). Break
159 * down any such message into smaller chunks. Opportunistically, fragment
160 * the chunks down to the current MTU constraints. We may get refragmented
161 * later if the PMTU changes, but it is _much better_ to fragment immediately
162 * with a reasonable guess than always doing our fragmentation on the
163 * soft-interrupt.
164 */
165struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
166 struct sctp_sndrcvinfo *sinfo,
167 struct msghdr *msgh, int msg_len)
168{
169 int max, whole, i, offset, over, err;
170 int len, first_len;
171 int max_data;
172 struct sctp_chunk *chunk;
173 struct sctp_datamsg *msg;
174 struct list_head *pos, *temp;
175 __u8 frag;
176
177 msg = sctp_datamsg_new(GFP_KERNEL);
178 if (!msg)
179 return ERR_PTR(-ENOMEM);
180
181 /* Note: Calculate this outside of the loop, so that all fragments
182 * have the same expiration.
183 */
184 if (sinfo->sinfo_timetolive) {
185 /* sinfo_timetolive is in milliseconds */
186 msg->expires_at = jiffies +
187 msecs_to_jiffies(sinfo->sinfo_timetolive);
188 msg->can_abandon = 1;
189
190 pr_debug("%s: msg:%p expires_at:%ld jiffies:%ld\n", __func__,
191 msg, msg->expires_at, jiffies);
192 }
193
194 /* This is the biggest possible DATA chunk that can fit into
195 * the packet
196 */
197 max_data = (asoc->pathmtu -
198 sctp_sk(asoc->base.sk)->pf->af->net_header_len -
199 sizeof(struct sctphdr) - sizeof(struct sctp_data_chunk)) & ~3;
200
201 max = asoc->frag_point;
202 /* If the the peer requested that we authenticate DATA chunks
203 * we need to account for bundling of the AUTH chunks along with
204 * DATA.
205 */
206 if (sctp_auth_send_cid(SCTP_CID_DATA, asoc)) {
207 struct sctp_hmac *hmac_desc = sctp_auth_asoc_get_hmac(asoc);
208
209 if (hmac_desc)
210 max_data -= WORD_ROUND(sizeof(sctp_auth_chunk_t) +
211 hmac_desc->hmac_len);
212 }
213
214 /* Now, check if we need to reduce our max */
215 if (max > max_data)
216 max = max_data;
217
218 whole = 0;
219 first_len = max;
220
221 /* Check to see if we have a pending SACK and try to let it be bundled
222 * with this message. Do this if we don't have any data queued already.
223 * To check that, look at out_qlen and retransmit list.
224 * NOTE: we will not reduce to account for SACK, if the message would
225 * not have been fragmented.
226 */
227 if (timer_pending(&asoc->timers[SCTP_EVENT_TIMEOUT_SACK]) &&
228 asoc->outqueue.out_qlen == 0 &&
229 list_empty(&asoc->outqueue.retransmit) &&
230 msg_len > max)
231 max_data -= WORD_ROUND(sizeof(sctp_sack_chunk_t));
232
233 /* Encourage Cookie-ECHO bundling. */
234 if (asoc->state < SCTP_STATE_COOKIE_ECHOED)
235 max_data -= SCTP_ARBITRARY_COOKIE_ECHO_LEN;
236
237 /* Now that we adjusted completely, reset first_len */
238 if (first_len > max_data)
239 first_len = max_data;
240
241 /* Account for a different sized first fragment */
242 if (msg_len >= first_len) {
243 msg_len -= first_len;
244 whole = 1;
245 msg->can_delay = 0;
246 }
247
248 /* How many full sized? How many bytes leftover? */
249 whole += msg_len / max;
250 over = msg_len % max;
251 offset = 0;
252
253 if ((whole > 1) || (whole && over))
254 SCTP_INC_STATS_USER(sock_net(asoc->base.sk), SCTP_MIB_FRAGUSRMSGS);
255
256 /* Create chunks for all the full sized DATA chunks. */
257 for (i = 0, len = first_len; i < whole; i++) {
258 frag = SCTP_DATA_MIDDLE_FRAG;
259
260 if (0 == i)
261 frag |= SCTP_DATA_FIRST_FRAG;
262
263 if ((i == (whole - 1)) && !over) {
264 frag |= SCTP_DATA_LAST_FRAG;
265
266 /* The application requests to set the I-bit of the
267 * last DATA chunk of a user message when providing
268 * the user message to the SCTP implementation.
269 */
270 if ((sinfo->sinfo_flags & SCTP_EOF) ||
271 (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
272 frag |= SCTP_DATA_SACK_IMM;
273 }
274
275 chunk = sctp_make_datafrag_empty(asoc, sinfo, len, frag, 0);
276
277 if (!chunk) {
278 err = -ENOMEM;
279 goto errout;
280 }
281
282 err = sctp_user_addto_chunk(chunk, offset, len, msgh->msg_iov);
283 if (err < 0)
284 goto errout_chunk_free;
285
286 offset += len;
287
288 /* Put the chunk->skb back into the form expected by send. */
289 __skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
290 - (__u8 *)chunk->skb->data);
291
292 sctp_datamsg_assign(msg, chunk);
293 list_add_tail(&chunk->frag_list, &msg->chunks);
294
295 /* The first chunk, the first chunk was likely short
296 * to allow bundling, so reset to full size.
297 */
298 if (0 == i)
299 len = max;
300 }
301
302 /* .. now the leftover bytes. */
303 if (over) {
304 if (!whole)
305 frag = SCTP_DATA_NOT_FRAG;
306 else
307 frag = SCTP_DATA_LAST_FRAG;
308
309 if ((sinfo->sinfo_flags & SCTP_EOF) ||
310 (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
311 frag |= SCTP_DATA_SACK_IMM;
312
313 chunk = sctp_make_datafrag_empty(asoc, sinfo, over, frag, 0);
314
315 if (!chunk) {
316 err = -ENOMEM;
317 goto errout;
318 }
319
320 err = sctp_user_addto_chunk(chunk, offset, over, msgh->msg_iov);
321
322 /* Put the chunk->skb back into the form expected by send. */
323 __skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
324 - (__u8 *)chunk->skb->data);
325 if (err < 0)
326 goto errout_chunk_free;
327
328 sctp_datamsg_assign(msg, chunk);
329 list_add_tail(&chunk->frag_list, &msg->chunks);
330 }
331
332 return msg;
333
334errout_chunk_free:
335 sctp_chunk_free(chunk);
336
337errout:
338 list_for_each_safe(pos, temp, &msg->chunks) {
339 list_del_init(pos);
340 chunk = list_entry(pos, struct sctp_chunk, frag_list);
341 sctp_chunk_free(chunk);
342 }
343 sctp_datamsg_put(msg);
344 return ERR_PTR(err);
345}
346
347/* Check whether this message has expired. */
348int sctp_chunk_abandoned(struct sctp_chunk *chunk)
349{
350 struct sctp_datamsg *msg = chunk->msg;
351
352 if (!msg->can_abandon)
353 return 0;
354
355 if (time_after(jiffies, msg->expires_at))
356 return 1;
357
358 return 0;
359}
360
361/* This chunk (and consequently entire message) has failed in its sending. */
362void sctp_chunk_fail(struct sctp_chunk *chunk, int error)
363{
364 chunk->msg->send_failed = 1;
365 chunk->msg->send_error = error;
366}
1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2003, 2004
3 *
4 * This file is part of the SCTP kernel implementation
5 *
6 * This file contains the code relating the chunk abstraction.
7 *
8 * This SCTP implementation is free software;
9 * you can redistribute it and/or modify it under the terms of
10 * the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
12 * any later version.
13 *
14 * This SCTP implementation is distributed in the hope that it
15 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
16 * ************************
17 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
18 * See the GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with GNU CC; see the file COPYING. If not, write to
22 * the Free Software Foundation, 59 Temple Place - Suite 330,
23 * Boston, MA 02111-1307, USA.
24 *
25 * Please send any bug reports or fixes you make to the
26 * email address(es):
27 * lksctp developers <lksctp-developers@lists.sourceforge.net>
28 *
29 * Or submit a bug report through the following website:
30 * http://www.sf.net/projects/lksctp
31 *
32 * Written or modified by:
33 * Jon Grimm <jgrimm@us.ibm.com>
34 * Sridhar Samudrala <sri@us.ibm.com>
35 *
36 * Any bugs reported given to us we will try to fix... any fixes shared will
37 * be incorporated into the next SCTP release.
38 */
39
40#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
41
42#include <linux/types.h>
43#include <linux/kernel.h>
44#include <linux/net.h>
45#include <linux/inet.h>
46#include <linux/skbuff.h>
47#include <linux/slab.h>
48#include <net/sock.h>
49#include <net/sctp/sctp.h>
50#include <net/sctp/sm.h>
51
52/* This file is mostly in anticipation of future work, but initially
53 * populate with fragment tracking for an outbound message.
54 */
55
56/* Initialize datamsg from memory. */
57static void sctp_datamsg_init(struct sctp_datamsg *msg)
58{
59 atomic_set(&msg->refcnt, 1);
60 msg->send_failed = 0;
61 msg->send_error = 0;
62 msg->can_abandon = 0;
63 msg->can_delay = 1;
64 msg->expires_at = 0;
65 INIT_LIST_HEAD(&msg->chunks);
66}
67
68/* Allocate and initialize datamsg. */
69SCTP_STATIC struct sctp_datamsg *sctp_datamsg_new(gfp_t gfp)
70{
71 struct sctp_datamsg *msg;
72 msg = kmalloc(sizeof(struct sctp_datamsg), gfp);
73 if (msg) {
74 sctp_datamsg_init(msg);
75 SCTP_DBG_OBJCNT_INC(datamsg);
76 }
77 return msg;
78}
79
80void sctp_datamsg_free(struct sctp_datamsg *msg)
81{
82 struct sctp_chunk *chunk;
83
84 /* This doesn't have to be a _safe vairant because
85 * sctp_chunk_free() only drops the refs.
86 */
87 list_for_each_entry(chunk, &msg->chunks, frag_list)
88 sctp_chunk_free(chunk);
89
90 sctp_datamsg_put(msg);
91}
92
93/* Final destructruction of datamsg memory. */
94static void sctp_datamsg_destroy(struct sctp_datamsg *msg)
95{
96 struct list_head *pos, *temp;
97 struct sctp_chunk *chunk;
98 struct sctp_sock *sp;
99 struct sctp_ulpevent *ev;
100 struct sctp_association *asoc = NULL;
101 int error = 0, notify;
102
103 /* If we failed, we may need to notify. */
104 notify = msg->send_failed ? -1 : 0;
105
106 /* Release all references. */
107 list_for_each_safe(pos, temp, &msg->chunks) {
108 list_del_init(pos);
109 chunk = list_entry(pos, struct sctp_chunk, frag_list);
110 /* Check whether we _really_ need to notify. */
111 if (notify < 0) {
112 asoc = chunk->asoc;
113 if (msg->send_error)
114 error = msg->send_error;
115 else
116 error = asoc->outqueue.error;
117
118 sp = sctp_sk(asoc->base.sk);
119 notify = sctp_ulpevent_type_enabled(SCTP_SEND_FAILED,
120 &sp->subscribe);
121 }
122
123 /* Generate a SEND FAILED event only if enabled. */
124 if (notify > 0) {
125 int sent;
126 if (chunk->has_tsn)
127 sent = SCTP_DATA_SENT;
128 else
129 sent = SCTP_DATA_UNSENT;
130
131 ev = sctp_ulpevent_make_send_failed(asoc, chunk, sent,
132 error, GFP_ATOMIC);
133 if (ev)
134 sctp_ulpq_tail_event(&asoc->ulpq, ev);
135 }
136
137 sctp_chunk_put(chunk);
138 }
139
140 SCTP_DBG_OBJCNT_DEC(datamsg);
141 kfree(msg);
142}
143
144/* Hold a reference. */
145static void sctp_datamsg_hold(struct sctp_datamsg *msg)
146{
147 atomic_inc(&msg->refcnt);
148}
149
150/* Release a reference. */
151void sctp_datamsg_put(struct sctp_datamsg *msg)
152{
153 if (atomic_dec_and_test(&msg->refcnt))
154 sctp_datamsg_destroy(msg);
155}
156
157/* Assign a chunk to this datamsg. */
158static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chunk)
159{
160 sctp_datamsg_hold(msg);
161 chunk->msg = msg;
162}
163
164
165/* A data chunk can have a maximum payload of (2^16 - 20). Break
166 * down any such message into smaller chunks. Opportunistically, fragment
167 * the chunks down to the current MTU constraints. We may get refragmented
168 * later if the PMTU changes, but it is _much better_ to fragment immediately
169 * with a reasonable guess than always doing our fragmentation on the
170 * soft-interrupt.
171 */
172struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
173 struct sctp_sndrcvinfo *sinfo,
174 struct msghdr *msgh, int msg_len)
175{
176 int max, whole, i, offset, over, err;
177 int len, first_len;
178 int max_data;
179 struct sctp_chunk *chunk;
180 struct sctp_datamsg *msg;
181 struct list_head *pos, *temp;
182 __u8 frag;
183
184 msg = sctp_datamsg_new(GFP_KERNEL);
185 if (!msg)
186 return NULL;
187
188 /* Note: Calculate this outside of the loop, so that all fragments
189 * have the same expiration.
190 */
191 if (sinfo->sinfo_timetolive) {
192 /* sinfo_timetolive is in milliseconds */
193 msg->expires_at = jiffies +
194 msecs_to_jiffies(sinfo->sinfo_timetolive);
195 msg->can_abandon = 1;
196 SCTP_DEBUG_PRINTK("%s: msg:%p expires_at: %ld jiffies:%ld\n",
197 __func__, msg, msg->expires_at, jiffies);
198 }
199
200 /* This is the biggest possible DATA chunk that can fit into
201 * the packet
202 */
203 max_data = asoc->pathmtu -
204 sctp_sk(asoc->base.sk)->pf->af->net_header_len -
205 sizeof(struct sctphdr) - sizeof(struct sctp_data_chunk);
206
207 max = asoc->frag_point;
208 /* If the the peer requested that we authenticate DATA chunks
209 * we need to accound for bundling of the AUTH chunks along with
210 * DATA.
211 */
212 if (sctp_auth_send_cid(SCTP_CID_DATA, asoc)) {
213 struct sctp_hmac *hmac_desc = sctp_auth_asoc_get_hmac(asoc);
214
215 if (hmac_desc)
216 max_data -= WORD_ROUND(sizeof(sctp_auth_chunk_t) +
217 hmac_desc->hmac_len);
218 }
219
220 /* Now, check if we need to reduce our max */
221 if (max > max_data)
222 max = max_data;
223
224 whole = 0;
225 first_len = max;
226
227 /* Check to see if we have a pending SACK and try to let it be bundled
228 * with this message. Do this if we don't have any data queued already.
229 * To check that, look at out_qlen and retransmit list.
230 * NOTE: we will not reduce to account for SACK, if the message would
231 * not have been fragmented.
232 */
233 if (timer_pending(&asoc->timers[SCTP_EVENT_TIMEOUT_SACK]) &&
234 asoc->outqueue.out_qlen == 0 &&
235 list_empty(&asoc->outqueue.retransmit) &&
236 msg_len > max)
237 max_data -= WORD_ROUND(sizeof(sctp_sack_chunk_t));
238
239 /* Encourage Cookie-ECHO bundling. */
240 if (asoc->state < SCTP_STATE_COOKIE_ECHOED)
241 max_data -= SCTP_ARBITRARY_COOKIE_ECHO_LEN;
242
243 /* Now that we adjusted completely, reset first_len */
244 if (first_len > max_data)
245 first_len = max_data;
246
247 /* Account for a different sized first fragment */
248 if (msg_len >= first_len) {
249 msg_len -= first_len;
250 whole = 1;
251 msg->can_delay = 0;
252 }
253
254 /* How many full sized? How many bytes leftover? */
255 whole += msg_len / max;
256 over = msg_len % max;
257 offset = 0;
258
259 if ((whole > 1) || (whole && over))
260 SCTP_INC_STATS_USER(SCTP_MIB_FRAGUSRMSGS);
261
262 /* Create chunks for all the full sized DATA chunks. */
263 for (i=0, len=first_len; i < whole; i++) {
264 frag = SCTP_DATA_MIDDLE_FRAG;
265
266 if (0 == i)
267 frag |= SCTP_DATA_FIRST_FRAG;
268
269 if ((i == (whole - 1)) && !over) {
270 frag |= SCTP_DATA_LAST_FRAG;
271
272 /* The application requests to set the I-bit of the
273 * last DATA chunk of a user message when providing
274 * the user message to the SCTP implementation.
275 */
276 if ((sinfo->sinfo_flags & SCTP_EOF) ||
277 (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
278 frag |= SCTP_DATA_SACK_IMM;
279 }
280
281 chunk = sctp_make_datafrag_empty(asoc, sinfo, len, frag, 0);
282
283 if (!chunk)
284 goto errout;
285 err = sctp_user_addto_chunk(chunk, offset, len, msgh->msg_iov);
286 if (err < 0)
287 goto errout;
288
289 offset += len;
290
291 /* Put the chunk->skb back into the form expected by send. */
292 __skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
293 - (__u8 *)chunk->skb->data);
294
295 sctp_datamsg_assign(msg, chunk);
296 list_add_tail(&chunk->frag_list, &msg->chunks);
297
298 /* The first chunk, the first chunk was likely short
299 * to allow bundling, so reset to full size.
300 */
301 if (0 == i)
302 len = max;
303 }
304
305 /* .. now the leftover bytes. */
306 if (over) {
307 if (!whole)
308 frag = SCTP_DATA_NOT_FRAG;
309 else
310 frag = SCTP_DATA_LAST_FRAG;
311
312 if ((sinfo->sinfo_flags & SCTP_EOF) ||
313 (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
314 frag |= SCTP_DATA_SACK_IMM;
315
316 chunk = sctp_make_datafrag_empty(asoc, sinfo, over, frag, 0);
317
318 if (!chunk)
319 goto errout;
320
321 err = sctp_user_addto_chunk(chunk, offset, over,msgh->msg_iov);
322
323 /* Put the chunk->skb back into the form expected by send. */
324 __skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
325 - (__u8 *)chunk->skb->data);
326 if (err < 0)
327 goto errout;
328
329 sctp_datamsg_assign(msg, chunk);
330 list_add_tail(&chunk->frag_list, &msg->chunks);
331 }
332
333 return msg;
334
335errout:
336 list_for_each_safe(pos, temp, &msg->chunks) {
337 list_del_init(pos);
338 chunk = list_entry(pos, struct sctp_chunk, frag_list);
339 sctp_chunk_free(chunk);
340 }
341 sctp_datamsg_put(msg);
342 return NULL;
343}
344
345/* Check whether this message has expired. */
346int sctp_chunk_abandoned(struct sctp_chunk *chunk)
347{
348 struct sctp_datamsg *msg = chunk->msg;
349
350 if (!msg->can_abandon)
351 return 0;
352
353 if (time_after(jiffies, msg->expires_at))
354 return 1;
355
356 return 0;
357}
358
359/* This chunk (and consequently entire message) has failed in its sending. */
360void sctp_chunk_fail(struct sctp_chunk *chunk, int error)
361{
362 chunk->msg->send_failed = 1;
363 chunk->msg->send_error = error;
364}