[linux.git] / net / sctp / chunk.c

/* SCTP kernel implementation
 * (C) Copyright IBM Corp. 2003, 2004
 *
 * This file is part of the SCTP kernel implementation
 *
 * This file contains the code relating the chunk abstraction.
 *
 * This SCTP implementation is free software;
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This SCTP implementation is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <[email protected]>
 *
 * Written or modified by:
 *    Jon Grimm             <[email protected]>
 *    Sridhar Samudrala     <[email protected]>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>

/* This file is mostly in anticipation of future work, but initially
 * populate with fragment tracking for an outbound message.
 */

/* Initialize datamsg from memory. */
static void sctp_datamsg_init(struct sctp_datamsg *msg)
{
	atomic_set(&msg->refcnt, 1);
	msg->send_failed = 0;
	msg->send_error = 0;
	msg->can_delay = 1;
	msg->expires_at = 0;
	INIT_LIST_HEAD(&msg->chunks);
}

/* Allocate and initialize datamsg. */
static struct sctp_datamsg *sctp_datamsg_new(gfp_t gfp)
{
	struct sctp_datamsg *msg;
	msg = kmalloc(sizeof(struct sctp_datamsg), gfp);
	if (msg) {
		sctp_datamsg_init(msg);
		SCTP_DBG_OBJCNT_INC(datamsg);
	}
	return msg;
}

void sctp_datamsg_free(struct sctp_datamsg *msg)
{
	struct sctp_chunk *chunk;

	/* This doesn't have to be a _safe vairant because
	 * sctp_chunk_free() only drops the refs.
	 */
	list_for_each_entry(chunk, &msg->chunks, frag_list)
		sctp_chunk_free(chunk);

	sctp_datamsg_put(msg);
}

/* Final destructruction of datamsg memory. */
static void sctp_datamsg_destroy(struct sctp_datamsg *msg)
{
	struct list_head *pos, *temp;
	struct sctp_chunk *chunk;
	struct sctp_sock *sp;
	struct sctp_ulpevent *ev;
	struct sctp_association *asoc = NULL;
	int error = 0, notify;

	/* If we failed, we may need to notify. */
	notify = msg->send_failed ? -1 : 0;

	/* Release all references. */
	list_for_each_safe(pos, temp, &msg->chunks) {
		list_del_init(pos);
		chunk = list_entry(pos, struct sctp_chunk, frag_list);
		/* Check whether we _really_ need to notify. */
		if (notify < 0) {
			asoc = chunk->asoc;
			if (msg->send_error)
				error = msg->send_error;
			else
				error = asoc->outqueue.error;

			sp = sctp_sk(asoc->base.sk);
			notify = sctp_ulpevent_type_enabled(SCTP_SEND_FAILED,
							    &sp->subscribe);
		}

		/* Generate a SEND FAILED event only if enabled. */
		if (notify > 0) {
			int sent;
			if (chunk->has_tsn)
				sent = SCTP_DATA_SENT;
			else
				sent = SCTP_DATA_UNSENT;

			ev = sctp_ulpevent_make_send_failed(asoc, chunk, sent,
							    error, GFP_ATOMIC);
			if (ev)
				sctp_ulpq_tail_event(&asoc->ulpq, ev);
		}

		sctp_chunk_put(chunk);
	}

	SCTP_DBG_OBJCNT_DEC(datamsg);
	kfree(msg);
}

/* Hold a reference. */
static void sctp_datamsg_hold(struct sctp_datamsg *msg)
{
	atomic_inc(&msg->refcnt);
}

/* Release a reference. */
void sctp_datamsg_put(struct sctp_datamsg *msg)
{
	if (atomic_dec_and_test(&msg->refcnt))
		sctp_datamsg_destroy(msg);
}

/* Assign a chunk to this datamsg. */
static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chunk)
{
	sctp_datamsg_hold(msg);
	chunk->msg = msg;
}


/* A data chunk can have a maximum payload of (2^16 - 20).  Break
 * down any such message into smaller chunks.  Opportunistically, fragment
 * the chunks down to the current MTU constraints.  We may get refragmented
 * later if the PMTU changes, but it is _much better_ to fragment immediately
 * with a reasonable guess than always doing our fragmentation on the
 * soft-interrupt.
 */
struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
					    struct sctp_sndrcvinfo *sinfo,
					    struct iov_iter *from)
{
	int max, whole, i, offset, over, err;
	int len, first_len;
	int max_data;
	struct sctp_chunk *chunk;
	struct sctp_datamsg *msg;
	struct list_head *pos, *temp;
	size_t msg_len = iov_iter_count(from);
	__u8 frag;

	msg = sctp_datamsg_new(GFP_KERNEL);
	if (!msg)
		return ERR_PTR(-ENOMEM);

	/* Note: Calculate this outside of the loop, so that all fragments
	 * have the same expiration.
	 */
	if (asoc->peer.prsctp_capable && sinfo->sinfo_timetolive &&
	    (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags) ||
	     !SCTP_PR_POLICY(sinfo->sinfo_flags)))
		msg->expires_at = jiffies +
				    msecs_to_jiffies(sinfo->sinfo_timetolive);

	/* This is the biggest possible DATA chunk that can fit into
	 * the packet
	 */
	max_data = asoc->pathmtu -
		   sctp_sk(asoc->base.sk)->pf->af->net_header_len -
		   sizeof(struct sctphdr) - sizeof(struct sctp_data_chunk);
	max_data = SCTP_TRUNC4(max_data);

	max = asoc->frag_point;
	/* If the the peer requested that we authenticate DATA chunks
	 * we need to account for bundling of the AUTH chunks along with
	 * DATA.
	 */
	if (sctp_auth_send_cid(SCTP_CID_DATA, asoc)) {
		struct sctp_hmac *hmac_desc = sctp_auth_asoc_get_hmac(asoc);

		if (hmac_desc)
			max_data -= SCTP_PAD4(sizeof(sctp_auth_chunk_t) +
					      hmac_desc->hmac_len);
	}

	/* Now, check if we need to reduce our max */
	if (max > max_data)
		max = max_data;

	whole = 0;
	first_len = max;

	/* Check to see if we have a pending SACK and try to let it be bundled
	 * with this message.  Do this if we don't have any data queued already.
	 * To check that, look at out_qlen and retransmit list.
	 * NOTE: we will not reduce to account for SACK, if the message would
	 * not have been fragmented.
	 */
	if (timer_pending(&asoc->timers[SCTP_EVENT_TIMEOUT_SACK]) &&
	    asoc->outqueue.out_qlen == 0 &&
	    list_empty(&asoc->outqueue.retransmit) &&
	    msg_len > max)
		max_data -= SCTP_PAD4(sizeof(sctp_sack_chunk_t));

	/* Encourage Cookie-ECHO bundling. */
	if (asoc->state < SCTP_STATE_COOKIE_ECHOED)
		max_data -= SCTP_ARBITRARY_COOKIE_ECHO_LEN;

	/* Now that we adjusted completely, reset first_len */
	if (first_len > max_data)
		first_len = max_data;

	/* Account for a different sized first fragment */
	if (msg_len >= first_len) {
		msg_len -= first_len;
		whole = 1;
		msg->can_delay = 0;
	}

	/* How many full sized?  How many bytes leftover? */
	whole += msg_len / max;
	over = msg_len % max;
	offset = 0;

	if ((whole > 1) || (whole && over))
		SCTP_INC_STATS(sock_net(asoc->base.sk), SCTP_MIB_FRAGUSRMSGS);

	/* Create chunks for all the full sized DATA chunks. */
	for (i = 0, len = first_len; i < whole; i++) {
		frag = SCTP_DATA_MIDDLE_FRAG;

		if (0 == i)
			frag |= SCTP_DATA_FIRST_FRAG;

		if ((i == (whole - 1)) && !over) {
			frag |= SCTP_DATA_LAST_FRAG;

			/* The application requests to set the I-bit of the
			 * last DATA chunk of a user message when providing
			 * the user message to the SCTP implementation.
			 */
			if ((sinfo->sinfo_flags & SCTP_EOF) ||
			    (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
				frag |= SCTP_DATA_SACK_IMM;
		}

		chunk = sctp_make_datafrag_empty(asoc, sinfo, len, frag,
						 0, GFP_KERNEL);

		if (!chunk) {
			err = -ENOMEM;
			goto errout;
		}

		err = sctp_user_addto_chunk(chunk, len, from);
		if (err < 0)
			goto errout_chunk_free;

		/* Put the chunk->skb back into the form expected by send.  */
		__skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
			   - (__u8 *)chunk->skb->data);

		sctp_datamsg_assign(msg, chunk);
		list_add_tail(&chunk->frag_list, &msg->chunks);

		/* The first chunk, the first chunk was likely short
		 * to allow bundling, so reset to full size.
		 */
		if (0 == i)
			len = max;
	}

	/* .. now the leftover bytes. */
	if (over) {
		if (!whole)
			frag = SCTP_DATA_NOT_FRAG;
		else
			frag = SCTP_DATA_LAST_FRAG;

		if ((sinfo->sinfo_flags & SCTP_EOF) ||
		    (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
			frag |= SCTP_DATA_SACK_IMM;

		chunk = sctp_make_datafrag_empty(asoc, sinfo, over, frag,
						 0, GFP_KERNEL);

		if (!chunk) {
			err = -ENOMEM;
			goto errout;
		}

		err = sctp_user_addto_chunk(chunk, over, from);

		/* Put the chunk->skb back into the form expected by send.  */
		__skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
			   - (__u8 *)chunk->skb->data);
		if (err < 0)
			goto errout_chunk_free;

		sctp_datamsg_assign(msg, chunk);
		list_add_tail(&chunk->frag_list, &msg->chunks);
	}

	return msg;

errout_chunk_free:
	sctp_chunk_free(chunk);

errout:
	list_for_each_safe(pos, temp, &msg->chunks) {
		list_del_init(pos);
		chunk = list_entry(pos, struct sctp_chunk, frag_list);
		sctp_chunk_free(chunk);
	}
	sctp_datamsg_put(msg);
	return ERR_PTR(err);
}

/* Check whether this message has expired. */
int sctp_chunk_abandoned(struct sctp_chunk *chunk)
{
	if (!chunk->asoc->peer.prsctp_capable)
		return 0;

	if (SCTP_PR_TTL_ENABLED(chunk->sinfo.sinfo_flags) &&
	    time_after(jiffies, chunk->msg->expires_at)) {
		if (chunk->sent_count)
			chunk->asoc->abandoned_sent[SCTP_PR_INDEX(TTL)]++;
		else
			chunk->asoc->abandoned_unsent[SCTP_PR_INDEX(TTL)]++;
		return 1;
	} else if (SCTP_PR_RTX_ENABLED(chunk->sinfo.sinfo_flags) &&
		   chunk->sent_count > chunk->sinfo.sinfo_timetolive) {
		chunk->asoc->abandoned_sent[SCTP_PR_INDEX(RTX)]++;
		return 1;
	} else if (!SCTP_PR_POLICY(chunk->sinfo.sinfo_flags) &&
		   chunk->msg->expires_at &&
		   time_after(jiffies, chunk->msg->expires_at)) {
		return 1;
	}
	/* PRIO policy is processed by sendmsg, not here */

	return 0;
}

/* This chunk (and consequently entire message) has failed in its sending. */
void sctp_chunk_fail(struct sctp_chunk *chunk, int error)
{
	chunk->msg->send_failed = 1;
	chunk->msg->send_error = error;
}
Commit	Line	Data
60c778b2	1	/* SCTP kernel implementation
1da177e4 LT	2	* (C) Copyright IBM Corp. 2003, 2004
1da177e4 LT	3	*
60c778b2	4	* This file is part of the SCTP kernel implementation
1da177e4	5	*
59c51591	6	* This file contains the code relating the chunk abstraction.
1da177e4	7	*
60c778b2	8	* This SCTP implementation is free software;
1da177e4 LT	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	*
60c778b2	14	* This SCTP implementation is distributed in the hope that it
1da177e4 LT	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
4b2f13a2 JK	21	* along with GNU CC; see the file COPYING. If not, see
4b2f13a2 JK	22	* <http://www.gnu.org/licenses/>.
1da177e4 LT	23	*
	24	* Please send any bug reports or fixes you make to the
	25	* email address(es):
91705c61	26	* lksctp developers <[email protected]>
1da177e4	27	*
1da177e4 LT	28	* Written or modified by:
	29	* Jon Grimm <[email protected]>
	30	* Sridhar Samudrala <[email protected]>
1da177e4 LT	31	*/
1da177e4 LT	32
145ce502 JP	33	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
145ce502 JP	34
1da177e4 LT	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>
5a0e3ad6	40	#include <linux/slab.h>
1da177e4 LT	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. */
	50	static 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;
0e3aef8d	55	msg->can_delay = 1;
1da177e4 LT	56	msg->expires_at = 0;
	57	INIT_LIST_HEAD(&msg->chunks);
	58	}
	59
	60	/* Allocate and initialize datamsg. */
dda91928	61	static struct sctp_datamsg *sctp_datamsg_new(gfp_t gfp)
1da177e4 LT	62	{
	63	struct sctp_datamsg *msg;
	64	msg = kmalloc(sizeof(struct sctp_datamsg), gfp);
e8c38751	65	if (msg) {
1da177e4	66	sctp_datamsg_init(msg);
e8c38751 LZ	67	SCTP_DBG_OBJCNT_INC(datamsg);
e8c38751 LZ	68	}
1da177e4 LT	69	return msg;
	70	}
	71
b61c654f XL	72	void sctp_datamsg_free(struct sctp_datamsg *msg)
	73	{
	74	struct sctp_chunk *chunk;
	75
	76	/* This doesn't have to be a _safe vairant because
	77	* sctp_chunk_free() only drops the refs.
	78	*/
	79	list_for_each_entry(chunk, &msg->chunks, frag_list)
	80	sctp_chunk_free(chunk);
	81
	82	sctp_datamsg_put(msg);
	83	}
	84
1da177e4 LT	85	/* Final destructruction of datamsg memory. */
	86	static void sctp_datamsg_destroy(struct sctp_datamsg *msg)
	87	{
	88	struct list_head pos, temp;
	89	struct sctp_chunk *chunk;
	90	struct sctp_sock *sp;
	91	struct sctp_ulpevent *ev;
	92	struct sctp_association *asoc = NULL;
	93	int error = 0, notify;
	94
	95	/* If we failed, we may need to notify. */
	96	notify = msg->send_failed ? -1 : 0;
	97
	98	/* Release all references. */
	99	list_for_each_safe(pos, temp, &msg->chunks) {
	100	list_del_init(pos);
	101	chunk = list_entry(pos, struct sctp_chunk, frag_list);
	102	/* Check whether we _really_ need to notify. */
	103	if (notify < 0) {
	104	asoc = chunk->asoc;
	105	if (msg->send_error)
	106	error = msg->send_error;
	107	else
	108	error = asoc->outqueue.error;
	109
	110	sp = sctp_sk(asoc->base.sk);
	111	notify = sctp_ulpevent_type_enabled(SCTP_SEND_FAILED,
	112	&sp->subscribe);
	113	}
	114
	115	/* Generate a SEND FAILED event only if enabled. */
	116	if (notify > 0) {
	117	int sent;
	118	if (chunk->has_tsn)
	119	sent = SCTP_DATA_SENT;
	120	else
	121	sent = SCTP_DATA_UNSENT;
	122
	123	ev = sctp_ulpevent_make_send_failed(asoc, chunk, sent,
	124	error, GFP_ATOMIC);
	125	if (ev)
	126	sctp_ulpq_tail_event(&asoc->ulpq, ev);
	127	}
	128
	129	sctp_chunk_put(chunk);
	130	}
	131
	132	SCTP_DBG_OBJCNT_DEC(datamsg);
	133	kfree(msg);
	134	}
	135
	136	/* Hold a reference. */
	137	static void sctp_datamsg_hold(struct sctp_datamsg *msg)
	138	{
	139	atomic_inc(&msg->refcnt);
	140	}
	141
	142	/* Release a reference. */
	143	void sctp_datamsg_put(struct sctp_datamsg *msg)
	144	{
	145	if (atomic_dec_and_test(&msg->refcnt))
	146	sctp_datamsg_destroy(msg);
	147	}
	148
1da177e4 LT	149	/* Assign a chunk to this datamsg. */
	150	static void sctp_datamsg_assign(struct sctp_datamsg msg, struct sctp_chunk chunk)
	151	{
	152	sctp_datamsg_hold(msg);
	153	chunk->msg = msg;
	154	}
	155
	156
	157	/* A data chunk can have a maximum payload of (2^16 - 20). Break
	158	* down any such message into smaller chunks. Opportunistically, fragment
	159	* the chunks down to the current MTU constraints. We may get refragmented
	160	* later if the PMTU changes, but it is _much better_ to fragment immediately
	161	* with a reasonable guess than always doing our fragmentation on the
	162	* soft-interrupt.
	163	*/
	164	struct sctp_datamsg sctp_datamsg_from_user(struct sctp_association asoc,
	165	struct sctp_sndrcvinfo *sinfo,
e0eb093e	166	struct iov_iter *from)
1da177e4 LT	167	{
	168	int max, whole, i, offset, over, err;
	169	int len, first_len;
3e62abf9	170	int max_data;
1da177e4 LT	171	struct sctp_chunk *chunk;
	172	struct sctp_datamsg *msg;
	173	struct list_head pos, temp;
e0eb093e	174	size_t msg_len = iov_iter_count(from);
1da177e4 LT	175	__u8 frag;
	176
	177	msg = sctp_datamsg_new(GFP_KERNEL);
	178	if (!msg)
6e51fe75	179	return ERR_PTR(-ENOMEM);
1da177e4 LT	180
	181	/* Note: Calculate this outside of the loop, so that all fragments
	182	* have the same expiration.
	183	*/
8ae808eb XL	184	if (asoc->peer.prsctp_capable && sinfo->sinfo_timetolive &&
	185	(SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags) \|\|
	186	!SCTP_PR_POLICY(sinfo->sinfo_flags)))
1da177e4 LT	187	msg->expires_at = jiffies +
1da177e4 LT	188	msecs_to_jiffies(sinfo->sinfo_timetolive);
0605483f	189
3e62abf9 VY	190	/* This is the biggest possible DATA chunk that can fit into
	191	* the packet
	192	*/
4a225ce3 MRL	193	max_data = asoc->pathmtu -
	194	sctp_sk(asoc->base.sk)->pf->af->net_header_len -
	195	sizeof(struct sctphdr) - sizeof(struct sctp_data_chunk);
	196	max_data = SCTP_TRUNC4(max_data);
1da177e4	197
3e62abf9	198	max = asoc->frag_point;
4cd57c80	199	/* If the the peer requested that we authenticate DATA chunks
2bccbadf	200	* we need to account for bundling of the AUTH chunks along with
4cd57c80 VY	201	* DATA.
	202	*/
	203	if (sctp_auth_send_cid(SCTP_CID_DATA, asoc)) {
	204	struct sctp_hmac *hmac_desc = sctp_auth_asoc_get_hmac(asoc);
	205
	206	if (hmac_desc)
e2f036a9 MRL	207	max_data -= SCTP_PAD4(sizeof(sctp_auth_chunk_t) +
e2f036a9 MRL	208	hmac_desc->hmac_len);
4cd57c80 VY	209	}
4cd57c80 VY	210
3e62abf9 VY	211	/* Now, check if we need to reduce our max */
	212	if (max > max_data)
	213	max = max_data;
	214
1da177e4 LT	215	whole = 0;
	216	first_len = max;
	217
5d7ff261 VY	218	/* Check to see if we have a pending SACK and try to let it be bundled
	219	* with this message. Do this if we don't have any data queued already.
	220	* To check that, look at out_qlen and retransmit list.
	221	* NOTE: we will not reduce to account for SACK, if the message would
	222	* not have been fragmented.
	223	*/
	224	if (timer_pending(&asoc->timers[SCTP_EVENT_TIMEOUT_SACK]) &&
	225	asoc->outqueue.out_qlen == 0 &&
	226	list_empty(&asoc->outqueue.retransmit) &&
	227	msg_len > max)
e2f036a9	228	max_data -= SCTP_PAD4(sizeof(sctp_sack_chunk_t));
5d7ff261	229
1da177e4	230	/* Encourage Cookie-ECHO bundling. */
5d7ff261	231	if (asoc->state < SCTP_STATE_COOKIE_ECHOED)
3e62abf9	232	max_data -= SCTP_ARBITRARY_COOKIE_ECHO_LEN;
1da177e4	233
5d7ff261 VY	234	/* Now that we adjusted completely, reset first_len */
	235	if (first_len > max_data)
	236	first_len = max_data;
3e62abf9 VY	237
	238	/* Account for a different sized first fragment */
	239	if (msg_len >= first_len) {
	240	msg_len -= first_len;
	241	whole = 1;
0e3aef8d	242	msg->can_delay = 0;
1da177e4 LT	243	}
	244
	245	/* How many full sized? How many bytes leftover? */
	246	whole += msg_len / max;
	247	over = msg_len % max;
	248	offset = 0;
	249
	250	if ((whole > 1) \|\| (whole && over))
6aef70a8	251	SCTP_INC_STATS(sock_net(asoc->base.sk), SCTP_MIB_FRAGUSRMSGS);
1da177e4 LT	252
1da177e4 LT	253	/* Create chunks for all the full sized DATA chunks. */
cb3f837b	254	for (i = 0, len = first_len; i < whole; i++) {
1da177e4 LT	255	frag = SCTP_DATA_MIDDLE_FRAG;
	256
	257	if (0 == i)
	258	frag \|= SCTP_DATA_FIRST_FRAG;
	259
b93d6471	260	if ((i == (whole - 1)) && !over) {
1da177e4 LT	261	frag \|= SCTP_DATA_LAST_FRAG;
1da177e4 LT	262
b93d6471 WY	263	/* The application requests to set the I-bit of the
	264	* last DATA chunk of a user message when providing
	265	* the user message to the SCTP implementation.
	266	*/
	267	if ((sinfo->sinfo_flags & SCTP_EOF) \|\|
	268	(sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
	269	frag \|= SCTP_DATA_SACK_IMM;
	270	}
	271
cea8768f MRL	272	chunk = sctp_make_datafrag_empty(asoc, sinfo, len, frag,
cea8768f MRL	273	0, GFP_KERNEL);
1da177e4	274
6e51fe75 TR	275	if (!chunk) {
6e51fe75 TR	276	err = -ENOMEM;
1da177e4	277	goto errout;
6e51fe75 TR	278	}
6e51fe75 TR	279
e0eb093e	280	err = sctp_user_addto_chunk(chunk, len, from);
1da177e4	281	if (err < 0)
be364c8c	282	goto errout_chunk_free;
1da177e4	283
1da177e4 LT	284	/* Put the chunk->skb back into the form expected by send. */
	285	__skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
	286	- (__u8 *)chunk->skb->data);
	287
	288	sctp_datamsg_assign(msg, chunk);
	289	list_add_tail(&chunk->frag_list, &msg->chunks);
	290
	291	/* The first chunk, the first chunk was likely short
	292	* to allow bundling, so reset to full size.
	293	*/
	294	if (0 == i)
	295	len = max;
	296	}
	297
	298	/* .. now the leftover bytes. */
	299	if (over) {
	300	if (!whole)
	301	frag = SCTP_DATA_NOT_FRAG;
	302	else
	303	frag = SCTP_DATA_LAST_FRAG;
	304
b93d6471 WY	305	if ((sinfo->sinfo_flags & SCTP_EOF) \|\|
	306	(sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
	307	frag \|= SCTP_DATA_SACK_IMM;
	308
cea8768f MRL	309	chunk = sctp_make_datafrag_empty(asoc, sinfo, over, frag,
cea8768f MRL	310	0, GFP_KERNEL);
1da177e4	311
6e51fe75 TR	312	if (!chunk) {
6e51fe75 TR	313	err = -ENOMEM;
1da177e4	314	goto errout;
6e51fe75	315	}
1da177e4	316
e0eb093e	317	err = sctp_user_addto_chunk(chunk, over, from);
1da177e4 LT	318
	319	/* Put the chunk->skb back into the form expected by send. */
	320	__skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
	321	- (__u8 *)chunk->skb->data);
	322	if (err < 0)
be364c8c	323	goto errout_chunk_free;
1da177e4 LT	324
	325	sctp_datamsg_assign(msg, chunk);
	326	list_add_tail(&chunk->frag_list, &msg->chunks);
	327	}
	328
	329	return msg;
	330
be364c8c TR	331	errout_chunk_free:
	332	sctp_chunk_free(chunk);
	333
1da177e4 LT	334	errout:
	335	list_for_each_safe(pos, temp, &msg->chunks) {
	336	list_del_init(pos);
	337	chunk = list_entry(pos, struct sctp_chunk, frag_list);
	338	sctp_chunk_free(chunk);
	339	}
80445cfb	340	sctp_datamsg_put(msg);
6e51fe75	341	return ERR_PTR(err);
1da177e4 LT	342	}
	343
	344	/* Check whether this message has expired. */
	345	int sctp_chunk_abandoned(struct sctp_chunk *chunk)
	346	{
8ae808eb	347	if (!chunk->asoc->peer.prsctp_capable)
1da177e4 LT	348	return 0;
1da177e4 LT	349
a6c2f792	350	if (SCTP_PR_TTL_ENABLED(chunk->sinfo.sinfo_flags) &&
0605483f	351	time_after(jiffies, chunk->msg->expires_at)) {
a6c2f792 XL	352	if (chunk->sent_count)
	353	chunk->asoc->abandoned_sent[SCTP_PR_INDEX(TTL)]++;
	354	else
	355	chunk->asoc->abandoned_unsent[SCTP_PR_INDEX(TTL)]++;
1da177e4	356	return 1;
01aadb3a	357	} else if (SCTP_PR_RTX_ENABLED(chunk->sinfo.sinfo_flags) &&
0605483f	358	chunk->sent_count > chunk->sinfo.sinfo_timetolive) {
01aadb3a XL	359	chunk->asoc->abandoned_sent[SCTP_PR_INDEX(RTX)]++;
01aadb3a XL	360	return 1;
8ae808eb XL	361	} else if (!SCTP_PR_POLICY(chunk->sinfo.sinfo_flags) &&
	362	chunk->msg->expires_at &&
	363	time_after(jiffies, chunk->msg->expires_at)) {
	364	return 1;
a6c2f792	365	}
8dbdf1f5	366	/* PRIO policy is processed by sendmsg, not here */
1da177e4 LT	367
	368	return 0;
	369	}
	370
	371	/* This chunk (and consequently entire message) has failed in its sending. */
	372	void sctp_chunk_fail(struct sctp_chunk *chunk, int error)
	373	{
	374	chunk->msg->send_failed = 1;
	375	chunk->msg->send_error = error;
	376	}