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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2003, 2004
4 *
5 * This file is part of the SCTP kernel implementation
6 *
7 * This file contains the code relating the chunk abstraction.
8 *
9 * Please send any bug reports or fixes you make to the
10 * email address(es):
11 * lksctp developers <linux-sctp@vger.kernel.org>
12 *
13 * Written or modified by:
14 * Jon Grimm <jgrimm@us.ibm.com>
15 * Sridhar Samudrala <sri@us.ibm.com>
16 */
17
18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20#include <linux/types.h>
21#include <linux/kernel.h>
22#include <linux/net.h>
23#include <linux/inet.h>
24#include <linux/skbuff.h>
25#include <linux/slab.h>
26#include <net/sock.h>
27#include <net/sctp/sctp.h>
28#include <net/sctp/sm.h>
29
30/* This file is mostly in anticipation of future work, but initially
31 * populate with fragment tracking for an outbound message.
32 */
33
34/* Initialize datamsg from memory. */
35static void sctp_datamsg_init(struct sctp_datamsg *msg)
36{
37 refcount_set(&msg->refcnt, 1);
38 msg->send_failed = 0;
39 msg->send_error = 0;
40 msg->can_delay = 1;
41 msg->abandoned = 0;
42 msg->expires_at = 0;
43 INIT_LIST_HEAD(&msg->chunks);
44}
45
46/* Allocate and initialize datamsg. */
47static struct sctp_datamsg *sctp_datamsg_new(gfp_t gfp)
48{
49 struct sctp_datamsg *msg;
50 msg = kmalloc(sizeof(struct sctp_datamsg), gfp);
51 if (msg) {
52 sctp_datamsg_init(msg);
53 SCTP_DBG_OBJCNT_INC(datamsg);
54 }
55 return msg;
56}
57
58void sctp_datamsg_free(struct sctp_datamsg *msg)
59{
60 struct sctp_chunk *chunk;
61
62 /* This doesn't have to be a _safe vairant because
63 * sctp_chunk_free() only drops the refs.
64 */
65 list_for_each_entry(chunk, &msg->chunks, frag_list)
66 sctp_chunk_free(chunk);
67
68 sctp_datamsg_put(msg);
69}
70
71/* Final destructruction of datamsg memory. */
72static void sctp_datamsg_destroy(struct sctp_datamsg *msg)
73{
74 struct sctp_association *asoc = NULL;
75 struct list_head *pos, *temp;
76 struct sctp_chunk *chunk;
77 struct sctp_ulpevent *ev;
78 int error = 0, notify;
79
80 /* If we failed, we may need to notify. */
81 notify = msg->send_failed ? -1 : 0;
82
83 /* Release all references. */
84 list_for_each_safe(pos, temp, &msg->chunks) {
85 list_del_init(pos);
86 chunk = list_entry(pos, struct sctp_chunk, frag_list);
87 /* Check whether we _really_ need to notify. */
88 if (notify < 0) {
89 asoc = chunk->asoc;
90 if (msg->send_error)
91 error = msg->send_error;
92 else
93 error = asoc->outqueue.error;
94
95 notify = sctp_ulpevent_type_enabled(asoc->subscribe,
96 SCTP_SEND_FAILED);
97 }
98
99 /* Generate a SEND FAILED event only if enabled. */
100 if (notify > 0) {
101 int sent;
102 if (chunk->has_tsn)
103 sent = SCTP_DATA_SENT;
104 else
105 sent = SCTP_DATA_UNSENT;
106
107 ev = sctp_ulpevent_make_send_failed(asoc, chunk, sent,
108 error, GFP_ATOMIC);
109 if (ev)
110 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
111 }
112
113 sctp_chunk_put(chunk);
114 }
115
116 SCTP_DBG_OBJCNT_DEC(datamsg);
117 kfree(msg);
118}
119
120/* Hold a reference. */
121static void sctp_datamsg_hold(struct sctp_datamsg *msg)
122{
123 refcount_inc(&msg->refcnt);
124}
125
126/* Release a reference. */
127void sctp_datamsg_put(struct sctp_datamsg *msg)
128{
129 if (refcount_dec_and_test(&msg->refcnt))
130 sctp_datamsg_destroy(msg);
131}
132
133/* Assign a chunk to this datamsg. */
134static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chunk)
135{
136 sctp_datamsg_hold(msg);
137 chunk->msg = msg;
138}
139
140
141/* A data chunk can have a maximum payload of (2^16 - 20). Break
142 * down any such message into smaller chunks. Opportunistically, fragment
143 * the chunks down to the current MTU constraints. We may get refragmented
144 * later if the PMTU changes, but it is _much better_ to fragment immediately
145 * with a reasonable guess than always doing our fragmentation on the
146 * soft-interrupt.
147 */
148struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
149 struct sctp_sndrcvinfo *sinfo,
150 struct iov_iter *from)
151{
152 size_t len, first_len, max_data, remaining;
153 size_t msg_len = iov_iter_count(from);
154 struct sctp_shared_key *shkey = NULL;
155 struct list_head *pos, *temp;
156 struct sctp_chunk *chunk;
157 struct sctp_datamsg *msg;
158 int err;
159
160 msg = sctp_datamsg_new(GFP_KERNEL);
161 if (!msg)
162 return ERR_PTR(-ENOMEM);
163
164 /* Note: Calculate this outside of the loop, so that all fragments
165 * have the same expiration.
166 */
167 if (asoc->peer.prsctp_capable && sinfo->sinfo_timetolive &&
168 (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags) ||
169 !SCTP_PR_POLICY(sinfo->sinfo_flags)))
170 msg->expires_at = jiffies +
171 msecs_to_jiffies(sinfo->sinfo_timetolive);
172
173 /* This is the biggest possible DATA chunk that can fit into
174 * the packet
175 */
176 max_data = asoc->frag_point;
177 if (unlikely(!max_data)) {
178 max_data = sctp_min_frag_point(sctp_sk(asoc->base.sk),
179 sctp_datachk_len(&asoc->stream));
180 pr_warn_ratelimited("%s: asoc:%p frag_point is zero, forcing max_data to default minimum (%zu)",
181 __func__, asoc, max_data);
182 }
183
184 /* If the the peer requested that we authenticate DATA chunks
185 * we need to account for bundling of the AUTH chunks along with
186 * DATA.
187 */
188 if (sctp_auth_send_cid(SCTP_CID_DATA, asoc)) {
189 struct sctp_hmac *hmac_desc = sctp_auth_asoc_get_hmac(asoc);
190
191 if (hmac_desc)
192 max_data -= SCTP_PAD4(sizeof(struct sctp_auth_chunk) +
193 hmac_desc->hmac_len);
194
195 if (sinfo->sinfo_tsn &&
196 sinfo->sinfo_ssn != asoc->active_key_id) {
197 shkey = sctp_auth_get_shkey(asoc, sinfo->sinfo_ssn);
198 if (!shkey) {
199 err = -EINVAL;
200 goto errout;
201 }
202 } else {
203 shkey = asoc->shkey;
204 }
205 }
206
207 /* Set first_len and then account for possible bundles on first frag */
208 first_len = max_data;
209
210 /* Check to see if we have a pending SACK and try to let it be bundled
211 * with this message. Do this if we don't have any data queued already.
212 * To check that, look at out_qlen and retransmit list.
213 * NOTE: we will not reduce to account for SACK, if the message would
214 * not have been fragmented.
215 */
216 if (timer_pending(&asoc->timers[SCTP_EVENT_TIMEOUT_SACK]) &&
217 asoc->outqueue.out_qlen == 0 &&
218 list_empty(&asoc->outqueue.retransmit) &&
219 msg_len > max_data)
220 first_len -= SCTP_PAD4(sizeof(struct sctp_sack_chunk));
221
222 /* Encourage Cookie-ECHO bundling. */
223 if (asoc->state < SCTP_STATE_COOKIE_ECHOED)
224 first_len -= SCTP_ARBITRARY_COOKIE_ECHO_LEN;
225
226 /* Account for a different sized first fragment */
227 if (msg_len >= first_len) {
228 msg->can_delay = 0;
229 if (msg_len > first_len)
230 SCTP_INC_STATS(sock_net(asoc->base.sk),
231 SCTP_MIB_FRAGUSRMSGS);
232 } else {
233 /* Which may be the only one... */
234 first_len = msg_len;
235 }
236
237 /* Create chunks for all DATA chunks. */
238 for (remaining = msg_len; remaining; remaining -= len) {
239 u8 frag = SCTP_DATA_MIDDLE_FRAG;
240
241 if (remaining == msg_len) {
242 /* First frag, which may also be the last */
243 frag |= SCTP_DATA_FIRST_FRAG;
244 len = first_len;
245 } else {
246 /* Middle frags */
247 len = max_data;
248 }
249
250 if (len >= remaining) {
251 /* Last frag, which may also be the first */
252 len = remaining;
253 frag |= SCTP_DATA_LAST_FRAG;
254
255 /* The application requests to set the I-bit of the
256 * last DATA chunk of a user message when providing
257 * the user message to the SCTP implementation.
258 */
259 if ((sinfo->sinfo_flags & SCTP_EOF) ||
260 (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
261 frag |= SCTP_DATA_SACK_IMM;
262 }
263
264 chunk = asoc->stream.si->make_datafrag(asoc, sinfo, len, frag,
265 GFP_KERNEL);
266 if (!chunk) {
267 err = -ENOMEM;
268 goto errout;
269 }
270
271 err = sctp_user_addto_chunk(chunk, len, from);
272 if (err < 0)
273 goto errout_chunk_free;
274
275 chunk->shkey = shkey;
276
277 /* Put the chunk->skb back into the form expected by send. */
278 __skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr -
279 chunk->skb->data);
280
281 sctp_datamsg_assign(msg, chunk);
282 list_add_tail(&chunk->frag_list, &msg->chunks);
283 }
284
285 return msg;
286
287errout_chunk_free:
288 sctp_chunk_free(chunk);
289
290errout:
291 list_for_each_safe(pos, temp, &msg->chunks) {
292 list_del_init(pos);
293 chunk = list_entry(pos, struct sctp_chunk, frag_list);
294 sctp_chunk_free(chunk);
295 }
296 sctp_datamsg_put(msg);
297
298 return ERR_PTR(err);
299}
300
301/* Check whether this message has expired. */
302int sctp_chunk_abandoned(struct sctp_chunk *chunk)
303{
304 if (!chunk->asoc->peer.prsctp_capable)
305 return 0;
306
307 if (chunk->msg->abandoned)
308 return 1;
309
310 if (!chunk->has_tsn &&
311 !(chunk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG))
312 return 0;
313
314 if (SCTP_PR_TTL_ENABLED(chunk->sinfo.sinfo_flags) &&
315 time_after(jiffies, chunk->msg->expires_at)) {
316 struct sctp_stream_out *streamout =
317 SCTP_SO(&chunk->asoc->stream,
318 chunk->sinfo.sinfo_stream);
319
320 if (chunk->sent_count) {
321 chunk->asoc->abandoned_sent[SCTP_PR_INDEX(TTL)]++;
322 streamout->ext->abandoned_sent[SCTP_PR_INDEX(TTL)]++;
323 } else {
324 chunk->asoc->abandoned_unsent[SCTP_PR_INDEX(TTL)]++;
325 streamout->ext->abandoned_unsent[SCTP_PR_INDEX(TTL)]++;
326 }
327 chunk->msg->abandoned = 1;
328 return 1;
329 } else if (SCTP_PR_RTX_ENABLED(chunk->sinfo.sinfo_flags) &&
330 chunk->sent_count > chunk->sinfo.sinfo_timetolive) {
331 struct sctp_stream_out *streamout =
332 SCTP_SO(&chunk->asoc->stream,
333 chunk->sinfo.sinfo_stream);
334
335 chunk->asoc->abandoned_sent[SCTP_PR_INDEX(RTX)]++;
336 streamout->ext->abandoned_sent[SCTP_PR_INDEX(RTX)]++;
337 chunk->msg->abandoned = 1;
338 return 1;
339 } else if (!SCTP_PR_POLICY(chunk->sinfo.sinfo_flags) &&
340 chunk->msg->expires_at &&
341 time_after(jiffies, chunk->msg->expires_at)) {
342 chunk->msg->abandoned = 1;
343 return 1;
344 }
345 /* PRIO policy is processed by sendmsg, not here */
346
347 return 0;
348}
349
350/* This chunk (and consequently entire message) has failed in its sending. */
351void sctp_chunk_fail(struct sctp_chunk *chunk, int error)
352{
353 chunk->msg->send_failed = 1;
354 chunk->msg->send_error = error;
355}
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
73/* Final destructruction of datamsg memory. */
74static void sctp_datamsg_destroy(struct sctp_datamsg *msg)
75{
76 struct list_head *pos, *temp;
77 struct sctp_chunk *chunk;
78 struct sctp_sock *sp;
79 struct sctp_ulpevent *ev;
80 struct sctp_association *asoc = NULL;
81 int error = 0, notify;
82
83 /* If we failed, we may need to notify. */
84 notify = msg->send_failed ? -1 : 0;
85
86 /* Release all references. */
87 list_for_each_safe(pos, temp, &msg->chunks) {
88 list_del_init(pos);
89 chunk = list_entry(pos, struct sctp_chunk, frag_list);
90 /* Check whether we _really_ need to notify. */
91 if (notify < 0) {
92 asoc = chunk->asoc;
93 if (msg->send_error)
94 error = msg->send_error;
95 else
96 error = asoc->outqueue.error;
97
98 sp = sctp_sk(asoc->base.sk);
99 notify = sctp_ulpevent_type_enabled(SCTP_SEND_FAILED,
100 &sp->subscribe);
101 }
102
103 /* Generate a SEND FAILED event only if enabled. */
104 if (notify > 0) {
105 int sent;
106 if (chunk->has_tsn)
107 sent = SCTP_DATA_SENT;
108 else
109 sent = SCTP_DATA_UNSENT;
110
111 ev = sctp_ulpevent_make_send_failed(asoc, chunk, sent,
112 error, GFP_ATOMIC);
113 if (ev)
114 sctp_ulpq_tail_event(&asoc->ulpq, ev);
115 }
116
117 sctp_chunk_put(chunk);
118 }
119
120 SCTP_DBG_OBJCNT_DEC(datamsg);
121 kfree(msg);
122}
123
124/* Hold a reference. */
125static void sctp_datamsg_hold(struct sctp_datamsg *msg)
126{
127 atomic_inc(&msg->refcnt);
128}
129
130/* Release a reference. */
131void sctp_datamsg_put(struct sctp_datamsg *msg)
132{
133 if (atomic_dec_and_test(&msg->refcnt))
134 sctp_datamsg_destroy(msg);
135}
136
137/* Assign a chunk to this datamsg. */
138static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chunk)
139{
140 sctp_datamsg_hold(msg);
141 chunk->msg = msg;
142}
143
144
145/* A data chunk can have a maximum payload of (2^16 - 20). Break
146 * down any such message into smaller chunks. Opportunistically, fragment
147 * the chunks down to the current MTU constraints. We may get refragmented
148 * later if the PMTU changes, but it is _much better_ to fragment immediately
149 * with a reasonable guess than always doing our fragmentation on the
150 * soft-interrupt.
151 */
152struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
153 struct sctp_sndrcvinfo *sinfo,
154 struct iov_iter *from)
155{
156 int max, whole, i, offset, over, err;
157 int len, first_len;
158 int max_data;
159 struct sctp_chunk *chunk;
160 struct sctp_datamsg *msg;
161 struct list_head *pos, *temp;
162 size_t msg_len = iov_iter_count(from);
163 __u8 frag;
164
165 msg = sctp_datamsg_new(GFP_KERNEL);
166 if (!msg)
167 return ERR_PTR(-ENOMEM);
168
169 /* Note: Calculate this outside of the loop, so that all fragments
170 * have the same expiration.
171 */
172 if (sinfo->sinfo_timetolive) {
173 /* sinfo_timetolive is in milliseconds */
174 msg->expires_at = jiffies +
175 msecs_to_jiffies(sinfo->sinfo_timetolive);
176 msg->can_abandon = 1;
177
178 pr_debug("%s: msg:%p expires_at:%ld jiffies:%ld\n", __func__,
179 msg, msg->expires_at, jiffies);
180 }
181
182 /* This is the biggest possible DATA chunk that can fit into
183 * the packet
184 */
185 max_data = (asoc->pathmtu -
186 sctp_sk(asoc->base.sk)->pf->af->net_header_len -
187 sizeof(struct sctphdr) - sizeof(struct sctp_data_chunk)) & ~3;
188
189 max = asoc->frag_point;
190 /* If the the peer requested that we authenticate DATA chunks
191 * we need to account for bundling of the AUTH chunks along with
192 * DATA.
193 */
194 if (sctp_auth_send_cid(SCTP_CID_DATA, asoc)) {
195 struct sctp_hmac *hmac_desc = sctp_auth_asoc_get_hmac(asoc);
196
197 if (hmac_desc)
198 max_data -= WORD_ROUND(sizeof(sctp_auth_chunk_t) +
199 hmac_desc->hmac_len);
200 }
201
202 /* Now, check if we need to reduce our max */
203 if (max > max_data)
204 max = max_data;
205
206 whole = 0;
207 first_len = max;
208
209 /* Check to see if we have a pending SACK and try to let it be bundled
210 * with this message. Do this if we don't have any data queued already.
211 * To check that, look at out_qlen and retransmit list.
212 * NOTE: we will not reduce to account for SACK, if the message would
213 * not have been fragmented.
214 */
215 if (timer_pending(&asoc->timers[SCTP_EVENT_TIMEOUT_SACK]) &&
216 asoc->outqueue.out_qlen == 0 &&
217 list_empty(&asoc->outqueue.retransmit) &&
218 msg_len > max)
219 max_data -= WORD_ROUND(sizeof(sctp_sack_chunk_t));
220
221 /* Encourage Cookie-ECHO bundling. */
222 if (asoc->state < SCTP_STATE_COOKIE_ECHOED)
223 max_data -= SCTP_ARBITRARY_COOKIE_ECHO_LEN;
224
225 /* Now that we adjusted completely, reset first_len */
226 if (first_len > max_data)
227 first_len = max_data;
228
229 /* Account for a different sized first fragment */
230 if (msg_len >= first_len) {
231 msg_len -= first_len;
232 whole = 1;
233 msg->can_delay = 0;
234 }
235
236 /* How many full sized? How many bytes leftover? */
237 whole += msg_len / max;
238 over = msg_len % max;
239 offset = 0;
240
241 if ((whole > 1) || (whole && over))
242 SCTP_INC_STATS_USER(sock_net(asoc->base.sk), SCTP_MIB_FRAGUSRMSGS);
243
244 /* Create chunks for all the full sized DATA chunks. */
245 for (i = 0, len = first_len; i < whole; i++) {
246 frag = SCTP_DATA_MIDDLE_FRAG;
247
248 if (0 == i)
249 frag |= SCTP_DATA_FIRST_FRAG;
250
251 if ((i == (whole - 1)) && !over) {
252 frag |= SCTP_DATA_LAST_FRAG;
253
254 /* The application requests to set the I-bit of the
255 * last DATA chunk of a user message when providing
256 * the user message to the SCTP implementation.
257 */
258 if ((sinfo->sinfo_flags & SCTP_EOF) ||
259 (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
260 frag |= SCTP_DATA_SACK_IMM;
261 }
262
263 chunk = sctp_make_datafrag_empty(asoc, sinfo, len, frag,
264 0, GFP_KERNEL);
265
266 if (!chunk) {
267 err = -ENOMEM;
268 goto errout;
269 }
270
271 err = sctp_user_addto_chunk(chunk, len, from);
272 if (err < 0)
273 goto errout_chunk_free;
274
275 /* Put the chunk->skb back into the form expected by send. */
276 __skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
277 - (__u8 *)chunk->skb->data);
278
279 sctp_datamsg_assign(msg, chunk);
280 list_add_tail(&chunk->frag_list, &msg->chunks);
281
282 /* The first chunk, the first chunk was likely short
283 * to allow bundling, so reset to full size.
284 */
285 if (0 == i)
286 len = max;
287 }
288
289 /* .. now the leftover bytes. */
290 if (over) {
291 if (!whole)
292 frag = SCTP_DATA_NOT_FRAG;
293 else
294 frag = SCTP_DATA_LAST_FRAG;
295
296 if ((sinfo->sinfo_flags & SCTP_EOF) ||
297 (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
298 frag |= SCTP_DATA_SACK_IMM;
299
300 chunk = sctp_make_datafrag_empty(asoc, sinfo, over, frag,
301 0, GFP_KERNEL);
302
303 if (!chunk) {
304 err = -ENOMEM;
305 goto errout;
306 }
307
308 err = sctp_user_addto_chunk(chunk, over, from);
309
310 /* Put the chunk->skb back into the form expected by send. */
311 __skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
312 - (__u8 *)chunk->skb->data);
313 if (err < 0)
314 goto errout_chunk_free;
315
316 sctp_datamsg_assign(msg, chunk);
317 list_add_tail(&chunk->frag_list, &msg->chunks);
318 }
319
320 return msg;
321
322errout_chunk_free:
323 sctp_chunk_free(chunk);
324
325errout:
326 list_for_each_safe(pos, temp, &msg->chunks) {
327 list_del_init(pos);
328 chunk = list_entry(pos, struct sctp_chunk, frag_list);
329 sctp_chunk_free(chunk);
330 }
331 sctp_datamsg_put(msg);
332 return ERR_PTR(err);
333}
334
335/* Check whether this message has expired. */
336int sctp_chunk_abandoned(struct sctp_chunk *chunk)
337{
338 struct sctp_datamsg *msg = chunk->msg;
339
340 if (!msg->can_abandon)
341 return 0;
342
343 if (time_after(jiffies, msg->expires_at))
344 return 1;
345
346 return 0;
347}
348
349/* This chunk (and consequently entire message) has failed in its sending. */
350void sctp_chunk_fail(struct sctp_chunk *chunk, int error)
351{
352 chunk->msg->send_failed = 1;
353 chunk->msg->send_error = error;
354}