147505b8bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
260c778b2SVlad Yasevich /* SCTP kernel implementation
31da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004
41da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc.
51da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc.
61da177e4SLinus Torvalds * Copyright (c) 2001 Intel Corp.
71da177e4SLinus Torvalds * Copyright (c) 2001 Nokia, Inc.
81da177e4SLinus Torvalds * Copyright (c) 2001 La Monte H.P. Yarroll
91da177e4SLinus Torvalds *
101da177e4SLinus Torvalds * This abstraction carries sctp events to the ULP (sockets).
111da177e4SLinus Torvalds *
121da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the
131da177e4SLinus Torvalds * email address(es):
1491705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org>
151da177e4SLinus Torvalds *
161da177e4SLinus Torvalds * Written or modified by:
171da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com>
181da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org>
191da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com>
201da177e4SLinus Torvalds */
211da177e4SLinus Torvalds
225a0e3ad6STejun Heo #include <linux/slab.h>
231da177e4SLinus Torvalds #include <linux/types.h>
241da177e4SLinus Torvalds #include <linux/skbuff.h>
251da177e4SLinus Torvalds #include <net/sock.h>
268465a5fcSNeil Horman #include <net/busy_poll.h>
271da177e4SLinus Torvalds #include <net/sctp/structs.h>
281da177e4SLinus Torvalds #include <net/sctp/sctp.h>
291da177e4SLinus Torvalds #include <net/sctp/sm.h>
301da177e4SLinus Torvalds
311da177e4SLinus Torvalds /* Forward declarations for internal helpers. */
321da177e4SLinus Torvalds static struct sctp_ulpevent *sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
331da177e4SLinus Torvalds struct sctp_ulpevent *);
341da177e4SLinus Torvalds static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *,
351da177e4SLinus Torvalds struct sctp_ulpevent *);
36ef5d4cf2SVlad Yasevich static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq);
371da177e4SLinus Torvalds
381da177e4SLinus Torvalds /* 1st Level Abstractions */
391da177e4SLinus Torvalds
401da177e4SLinus Torvalds /* Initialize a ULP queue from a block of memory. */
sctp_ulpq_init(struct sctp_ulpq * ulpq,struct sctp_association * asoc)41*6fdfdef7SAlexey Kodanev void sctp_ulpq_init(struct sctp_ulpq *ulpq, struct sctp_association *asoc)
421da177e4SLinus Torvalds {
431da177e4SLinus Torvalds memset(ulpq, 0, sizeof(struct sctp_ulpq));
441da177e4SLinus Torvalds
451da177e4SLinus Torvalds ulpq->asoc = asoc;
461da177e4SLinus Torvalds skb_queue_head_init(&ulpq->reasm);
4713228238SXin Long skb_queue_head_init(&ulpq->reasm_uo);
481da177e4SLinus Torvalds skb_queue_head_init(&ulpq->lobby);
491da177e4SLinus Torvalds ulpq->pd_mode = 0;
501da177e4SLinus Torvalds }
511da177e4SLinus Torvalds
521da177e4SLinus Torvalds
531da177e4SLinus Torvalds /* Flush the reassembly and ordering queues. */
sctp_ulpq_flush(struct sctp_ulpq * ulpq)540b58a811SVlad Yasevich void sctp_ulpq_flush(struct sctp_ulpq *ulpq)
551da177e4SLinus Torvalds {
561da177e4SLinus Torvalds struct sk_buff *skb;
571da177e4SLinus Torvalds struct sctp_ulpevent *event;
581da177e4SLinus Torvalds
591da177e4SLinus Torvalds while ((skb = __skb_dequeue(&ulpq->lobby)) != NULL) {
601da177e4SLinus Torvalds event = sctp_skb2event(skb);
611da177e4SLinus Torvalds sctp_ulpevent_free(event);
621da177e4SLinus Torvalds }
631da177e4SLinus Torvalds
641da177e4SLinus Torvalds while ((skb = __skb_dequeue(&ulpq->reasm)) != NULL) {
651da177e4SLinus Torvalds event = sctp_skb2event(skb);
661da177e4SLinus Torvalds sctp_ulpevent_free(event);
671da177e4SLinus Torvalds }
681da177e4SLinus Torvalds
6913228238SXin Long while ((skb = __skb_dequeue(&ulpq->reasm_uo)) != NULL) {
7013228238SXin Long event = sctp_skb2event(skb);
7113228238SXin Long sctp_ulpevent_free(event);
7213228238SXin Long }
731da177e4SLinus Torvalds }
741da177e4SLinus Torvalds
751da177e4SLinus Torvalds /* Dispose of a ulpqueue. */
sctp_ulpq_free(struct sctp_ulpq * ulpq)761da177e4SLinus Torvalds void sctp_ulpq_free(struct sctp_ulpq *ulpq)
771da177e4SLinus Torvalds {
781da177e4SLinus Torvalds sctp_ulpq_flush(ulpq);
791da177e4SLinus Torvalds }
801da177e4SLinus Torvalds
811da177e4SLinus Torvalds /* Process an incoming DATA chunk. */
sctp_ulpq_tail_data(struct sctp_ulpq * ulpq,struct sctp_chunk * chunk,gfp_t gfp)821da177e4SLinus Torvalds int sctp_ulpq_tail_data(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
83dd0fc66fSAl Viro gfp_t gfp)
841da177e4SLinus Torvalds {
851da177e4SLinus Torvalds struct sk_buff_head temp;
861da177e4SLinus Torvalds struct sctp_ulpevent *event;
87d003b41bSLee A. Roberts int event_eor = 0;
881da177e4SLinus Torvalds
891da177e4SLinus Torvalds /* Create an event from the incoming chunk. */
901da177e4SLinus Torvalds event = sctp_ulpevent_make_rcvmsg(chunk->asoc, chunk, gfp);
911da177e4SLinus Torvalds if (!event)
921da177e4SLinus Torvalds return -ENOMEM;
931da177e4SLinus Torvalds
94bd4d627dSXin Long event->ssn = ntohs(chunk->subh.data_hdr->ssn);
95bd4d627dSXin Long event->ppid = chunk->subh.data_hdr->ppid;
96bd4d627dSXin Long
971da177e4SLinus Torvalds /* Do reassembly if needed. */
981da177e4SLinus Torvalds event = sctp_ulpq_reasm(ulpq, event);
991da177e4SLinus Torvalds
1001da177e4SLinus Torvalds /* Do ordering if needed. */
101178ca044SDavid Miller if (event) {
1021da177e4SLinus Torvalds /* Create a temporary list to collect chunks on. */
1031da177e4SLinus Torvalds skb_queue_head_init(&temp);
1041da177e4SLinus Torvalds __skb_queue_tail(&temp, sctp_event2skb(event));
1051da177e4SLinus Torvalds
106178ca044SDavid Miller if (event->msg_flags & MSG_EOR)
1071da177e4SLinus Torvalds event = sctp_ulpq_order(ulpq, event);
1081da177e4SLinus Torvalds }
1091da177e4SLinus Torvalds
1108728b834SDavid S. Miller /* Send event to the ULP. 'event' is the sctp_ulpevent for
1118728b834SDavid S. Miller * very first SKB on the 'temp' list.
1128728b834SDavid S. Miller */
113d003b41bSLee A. Roberts if (event) {
114d003b41bSLee A. Roberts event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0;
115013b96ecSDavid Miller sctp_ulpq_tail_event(ulpq, &temp);
116d003b41bSLee A. Roberts }
1171da177e4SLinus Torvalds
118d003b41bSLee A. Roberts return event_eor;
1191da177e4SLinus Torvalds }
1201da177e4SLinus Torvalds
1211da177e4SLinus Torvalds /* Add a new event for propagation to the ULP. */
1221da177e4SLinus Torvalds /* Clear the partial delivery mode for this socket. Note: This
1231da177e4SLinus Torvalds * assumes that no association is currently in partial delivery mode.
1241da177e4SLinus Torvalds */
sctp_clear_pd(struct sock * sk,struct sctp_association * asoc)125b6e1331fSVlad Yasevich int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc)
1261da177e4SLinus Torvalds {
1271da177e4SLinus Torvalds struct sctp_sock *sp = sctp_sk(sk);
1281da177e4SLinus Torvalds
129b6e1331fSVlad Yasevich if (atomic_dec_and_test(&sp->pd_mode)) {
130b6e1331fSVlad Yasevich /* This means there are no other associations in PD, so
131b6e1331fSVlad Yasevich * we can go ahead and clear out the lobby in one shot
132b6e1331fSVlad Yasevich */
1331da177e4SLinus Torvalds if (!skb_queue_empty(&sp->pd_lobby)) {
134311b2177SMarcelo Ricardo Leitner skb_queue_splice_tail_init(&sp->pd_lobby,
135311b2177SMarcelo Ricardo Leitner &sk->sk_receive_queue);
1361da177e4SLinus Torvalds return 1;
1371da177e4SLinus Torvalds }
138b6e1331fSVlad Yasevich } else {
139b6e1331fSVlad Yasevich /* There are other associations in PD, so we only need to
140b6e1331fSVlad Yasevich * pull stuff out of the lobby that belongs to the
141b6e1331fSVlad Yasevich * associations that is exiting PD (all of its notifications
142b6e1331fSVlad Yasevich * are posted here).
143b6e1331fSVlad Yasevich */
144b6e1331fSVlad Yasevich if (!skb_queue_empty(&sp->pd_lobby) && asoc) {
145b6e1331fSVlad Yasevich struct sk_buff *skb, *tmp;
146b6e1331fSVlad Yasevich struct sctp_ulpevent *event;
147b6e1331fSVlad Yasevich
148b6e1331fSVlad Yasevich sctp_skb_for_each(skb, &sp->pd_lobby, tmp) {
149b6e1331fSVlad Yasevich event = sctp_skb2event(skb);
150b6e1331fSVlad Yasevich if (event->asoc == asoc) {
151b6e1331fSVlad Yasevich __skb_unlink(skb, &sp->pd_lobby);
152b6e1331fSVlad Yasevich __skb_queue_tail(&sk->sk_receive_queue,
153b6e1331fSVlad Yasevich skb);
154b6e1331fSVlad Yasevich }
155b6e1331fSVlad Yasevich }
156b6e1331fSVlad Yasevich }
157b6e1331fSVlad Yasevich }
158b6e1331fSVlad Yasevich
1591da177e4SLinus Torvalds return 0;
1601da177e4SLinus Torvalds }
1611da177e4SLinus Torvalds
162d49d91d7SVlad Yasevich /* Set the pd_mode on the socket and ulpq */
sctp_ulpq_set_pd(struct sctp_ulpq * ulpq)163d49d91d7SVlad Yasevich static void sctp_ulpq_set_pd(struct sctp_ulpq *ulpq)
164d49d91d7SVlad Yasevich {
165d49d91d7SVlad Yasevich struct sctp_sock *sp = sctp_sk(ulpq->asoc->base.sk);
166d49d91d7SVlad Yasevich
167d49d91d7SVlad Yasevich atomic_inc(&sp->pd_mode);
168d49d91d7SVlad Yasevich ulpq->pd_mode = 1;
169d49d91d7SVlad Yasevich }
170d49d91d7SVlad Yasevich
1711da177e4SLinus Torvalds /* Clear the pd_mode and restart any pending messages waiting for delivery. */
sctp_ulpq_clear_pd(struct sctp_ulpq * ulpq)1721da177e4SLinus Torvalds static int sctp_ulpq_clear_pd(struct sctp_ulpq *ulpq)
1731da177e4SLinus Torvalds {
1741da177e4SLinus Torvalds ulpq->pd_mode = 0;
175ef5d4cf2SVlad Yasevich sctp_ulpq_reasm_drain(ulpq);
176b6e1331fSVlad Yasevich return sctp_clear_pd(ulpq->asoc->base.sk, ulpq->asoc);
1771da177e4SLinus Torvalds }
1781da177e4SLinus Torvalds
sctp_ulpq_tail_event(struct sctp_ulpq * ulpq,struct sk_buff_head * skb_list)179013b96ecSDavid Miller int sctp_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sk_buff_head *skb_list)
1801da177e4SLinus Torvalds {
1811da177e4SLinus Torvalds struct sock *sk = ulpq->asoc->base.sk;
1820970f5b3SMarcelo Ricardo Leitner struct sctp_sock *sp = sctp_sk(sk);
183013b96ecSDavid Miller struct sctp_ulpevent *event;
184013b96ecSDavid Miller struct sk_buff_head *queue;
185013b96ecSDavid Miller struct sk_buff *skb;
1861da177e4SLinus Torvalds int clear_pd = 0;
1871da177e4SLinus Torvalds
188013b96ecSDavid Miller skb = __skb_peek(skb_list);
189013b96ecSDavid Miller event = sctp_skb2event(skb);
1908728b834SDavid S. Miller
1911da177e4SLinus Torvalds /* If the socket is just going to throw this away, do not
1921da177e4SLinus Torvalds * even try to deliver it.
1931da177e4SLinus Torvalds */
194a0fc6843SXin Long if (sk->sk_shutdown & RCV_SHUTDOWN &&
195a0fc6843SXin Long (sk->sk_shutdown & SEND_SHUTDOWN ||
196a0fc6843SXin Long !sctp_ulpevent_is_notification(event)))
1971da177e4SLinus Torvalds goto out_free;
1981da177e4SLinus Torvalds
1992c8c56e1SEric Dumazet if (!sctp_ulpevent_is_notification(event)) {
2008465a5fcSNeil Horman sk_mark_napi_id(sk, skb);
2012c8c56e1SEric Dumazet sk_incoming_cpu_update(sk);
2022c8c56e1SEric Dumazet }
2031da177e4SLinus Torvalds /* Check if the user wishes to receive this event. */
204a1e3a059SXin Long if (!sctp_ulpevent_is_enabled(event, ulpq->asoc->subscribe))
2051da177e4SLinus Torvalds goto out_free;
2061da177e4SLinus Torvalds
2071da177e4SLinus Torvalds /* If we are in partial delivery mode, post to the lobby until
2081da177e4SLinus Torvalds * partial delivery is cleared, unless, of course _this_ is
2091da177e4SLinus Torvalds * the association the cause of the partial delivery.
2101da177e4SLinus Torvalds */
2111da177e4SLinus Torvalds
2120970f5b3SMarcelo Ricardo Leitner if (atomic_read(&sp->pd_mode) == 0) {
2131da177e4SLinus Torvalds queue = &sk->sk_receive_queue;
214b6e1331fSVlad Yasevich } else {
215b6e1331fSVlad Yasevich if (ulpq->pd_mode) {
216d0cf0d99SVlad Yasevich /* If the association is in partial delivery, we
217d0cf0d99SVlad Yasevich * need to finish delivering the partially processed
218d0cf0d99SVlad Yasevich * packet before passing any other data. This is
219d0cf0d99SVlad Yasevich * because we don't truly support stream interleaving.
220d0cf0d99SVlad Yasevich */
221d0cf0d99SVlad Yasevich if ((event->msg_flags & MSG_NOTIFICATION) ||
222d0cf0d99SVlad Yasevich (SCTP_DATA_NOT_FRAG ==
223d0cf0d99SVlad Yasevich (event->msg_flags & SCTP_DATA_FRAG_MASK)))
2240970f5b3SMarcelo Ricardo Leitner queue = &sp->pd_lobby;
2251da177e4SLinus Torvalds else {
2261da177e4SLinus Torvalds clear_pd = event->msg_flags & MSG_EOR;
2271da177e4SLinus Torvalds queue = &sk->sk_receive_queue;
2281da177e4SLinus Torvalds }
229b6e1331fSVlad Yasevich } else {
230b6e1331fSVlad Yasevich /*
231b6e1331fSVlad Yasevich * If fragment interleave is enabled, we
23225985edcSLucas De Marchi * can queue this to the receive queue instead
233b6e1331fSVlad Yasevich * of the lobby.
234b6e1331fSVlad Yasevich */
2350970f5b3SMarcelo Ricardo Leitner if (sp->frag_interleave)
236b6e1331fSVlad Yasevich queue = &sk->sk_receive_queue;
237b6e1331fSVlad Yasevich else
2380970f5b3SMarcelo Ricardo Leitner queue = &sp->pd_lobby;
239b6e1331fSVlad Yasevich }
240b6e1331fSVlad Yasevich }
2411da177e4SLinus Torvalds
242311b2177SMarcelo Ricardo Leitner skb_queue_splice_tail_init(skb_list, queue);
2431da177e4SLinus Torvalds
2441da177e4SLinus Torvalds /* Did we just complete partial delivery and need to get
2451da177e4SLinus Torvalds * rolling again? Move pending data to the receive
2461da177e4SLinus Torvalds * queue.
2471da177e4SLinus Torvalds */
2481da177e4SLinus Torvalds if (clear_pd)
2491da177e4SLinus Torvalds sctp_ulpq_clear_pd(ulpq);
2501da177e4SLinus Torvalds
2510970f5b3SMarcelo Ricardo Leitner if (queue == &sk->sk_receive_queue && !sp->data_ready_signalled) {
2527906b00fSMarcelo Ricardo Leitner if (!sock_owned_by_user(sk))
2530970f5b3SMarcelo Ricardo Leitner sp->data_ready_signalled = 1;
2540970f5b3SMarcelo Ricardo Leitner sk->sk_data_ready(sk);
2550970f5b3SMarcelo Ricardo Leitner }
2561da177e4SLinus Torvalds return 1;
2571da177e4SLinus Torvalds
2581da177e4SLinus Torvalds out_free:
2598728b834SDavid S. Miller sctp_queue_purge_ulpevents(skb_list);
2608728b834SDavid S. Miller
2611da177e4SLinus Torvalds return 0;
2621da177e4SLinus Torvalds }
2631da177e4SLinus Torvalds
2641da177e4SLinus Torvalds /* 2nd Level Abstractions */
2651da177e4SLinus Torvalds
2661da177e4SLinus Torvalds /* Helper function to store chunks that need to be reassembled. */
sctp_ulpq_store_reasm(struct sctp_ulpq * ulpq,struct sctp_ulpevent * event)26701f2d384SVlad Yasevich static void sctp_ulpq_store_reasm(struct sctp_ulpq *ulpq,
2681da177e4SLinus Torvalds struct sctp_ulpevent *event)
2691da177e4SLinus Torvalds {
2701da177e4SLinus Torvalds struct sk_buff *pos;
2711da177e4SLinus Torvalds struct sctp_ulpevent *cevent;
2721da177e4SLinus Torvalds __u32 tsn, ctsn;
2731da177e4SLinus Torvalds
2741da177e4SLinus Torvalds tsn = event->tsn;
2751da177e4SLinus Torvalds
2761da177e4SLinus Torvalds /* See if it belongs at the end. */
2771da177e4SLinus Torvalds pos = skb_peek_tail(&ulpq->reasm);
2781da177e4SLinus Torvalds if (!pos) {
2791da177e4SLinus Torvalds __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
2801da177e4SLinus Torvalds return;
2811da177e4SLinus Torvalds }
2821da177e4SLinus Torvalds
2831da177e4SLinus Torvalds /* Short circuit just dropping it at the end. */
2841da177e4SLinus Torvalds cevent = sctp_skb2event(pos);
2851da177e4SLinus Torvalds ctsn = cevent->tsn;
2861da177e4SLinus Torvalds if (TSN_lt(ctsn, tsn)) {
2871da177e4SLinus Torvalds __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
2881da177e4SLinus Torvalds return;
2891da177e4SLinus Torvalds }
2901da177e4SLinus Torvalds
2911da177e4SLinus Torvalds /* Find the right place in this list. We store them by TSN. */
2921da177e4SLinus Torvalds skb_queue_walk(&ulpq->reasm, pos) {
2931da177e4SLinus Torvalds cevent = sctp_skb2event(pos);
2941da177e4SLinus Torvalds ctsn = cevent->tsn;
2951da177e4SLinus Torvalds
2961da177e4SLinus Torvalds if (TSN_lt(tsn, ctsn))
2971da177e4SLinus Torvalds break;
2981da177e4SLinus Torvalds }
2991da177e4SLinus Torvalds
3001da177e4SLinus Torvalds /* Insert before pos. */
30143f59c89SDavid S. Miller __skb_queue_before(&ulpq->reasm, pos, sctp_event2skb(event));
3021da177e4SLinus Torvalds
3031da177e4SLinus Torvalds }
3041da177e4SLinus Torvalds
3051da177e4SLinus Torvalds /* Helper function to return an event corresponding to the reassembled
3061da177e4SLinus Torvalds * datagram.
3071da177e4SLinus Torvalds * This routine creates a re-assembled skb given the first and last skb's
3081da177e4SLinus Torvalds * as stored in the reassembly queue. The skb's may be non-linear if the sctp
3091da177e4SLinus Torvalds * payload was fragmented on the way and ip had to reassemble them.
3101da177e4SLinus Torvalds * We add the rest of skb's to the first skb's fraglist.
3111da177e4SLinus Torvalds */
sctp_make_reassembled_event(struct net * net,struct sk_buff_head * queue,struct sk_buff * f_frag,struct sk_buff * l_frag)312bd4d627dSXin Long struct sctp_ulpevent *sctp_make_reassembled_event(struct net *net,
313bd4d627dSXin Long struct sk_buff_head *queue,
314bd4d627dSXin Long struct sk_buff *f_frag,
315b01a2407SEric W. Biederman struct sk_buff *l_frag)
3161da177e4SLinus Torvalds {
3171da177e4SLinus Torvalds struct sk_buff *pos;
318672e7ccaSVladislav Yasevich struct sk_buff *new = NULL;
3191da177e4SLinus Torvalds struct sctp_ulpevent *event;
3201da177e4SLinus Torvalds struct sk_buff *pnext, *last;
3211da177e4SLinus Torvalds struct sk_buff *list = skb_shinfo(f_frag)->frag_list;
3221da177e4SLinus Torvalds
3231da177e4SLinus Torvalds /* Store the pointer to the 2nd skb */
3241da177e4SLinus Torvalds if (f_frag == l_frag)
3251da177e4SLinus Torvalds pos = NULL;
3261da177e4SLinus Torvalds else
3271da177e4SLinus Torvalds pos = f_frag->next;
3281da177e4SLinus Torvalds
3291da177e4SLinus Torvalds /* Get the last skb in the f_frag's frag_list if present. */
3308d72651dSwangweidong for (last = list; list; last = list, list = list->next)
3318d72651dSwangweidong ;
3321da177e4SLinus Torvalds
3331da177e4SLinus Torvalds /* Add the list of remaining fragments to the first fragments
3341da177e4SLinus Torvalds * frag_list.
3351da177e4SLinus Torvalds */
3361da177e4SLinus Torvalds if (last)
3371da177e4SLinus Torvalds last->next = pos;
338672e7ccaSVladislav Yasevich else {
339672e7ccaSVladislav Yasevich if (skb_cloned(f_frag)) {
340672e7ccaSVladislav Yasevich /* This is a cloned skb, we can't just modify
341672e7ccaSVladislav Yasevich * the frag_list. We need a new skb to do that.
342672e7ccaSVladislav Yasevich * Instead of calling skb_unshare(), we'll do it
343672e7ccaSVladislav Yasevich * ourselves since we need to delay the free.
344672e7ccaSVladislav Yasevich */
345672e7ccaSVladislav Yasevich new = skb_copy(f_frag, GFP_ATOMIC);
346672e7ccaSVladislav Yasevich if (!new)
347672e7ccaSVladislav Yasevich return NULL; /* try again later */
348672e7ccaSVladislav Yasevich
349331c4ee7SVlad Yasevich sctp_skb_set_owner_r(new, f_frag->sk);
350672e7ccaSVladislav Yasevich
351672e7ccaSVladislav Yasevich skb_shinfo(new)->frag_list = pos;
352672e7ccaSVladislav Yasevich } else
3531da177e4SLinus Torvalds skb_shinfo(f_frag)->frag_list = pos;
354672e7ccaSVladislav Yasevich }
3551da177e4SLinus Torvalds
3561da177e4SLinus Torvalds /* Remove the first fragment from the reassembly queue. */
3578728b834SDavid S. Miller __skb_unlink(f_frag, queue);
358672e7ccaSVladislav Yasevich
359672e7ccaSVladislav Yasevich /* if we did unshare, then free the old skb and re-assign */
360672e7ccaSVladislav Yasevich if (new) {
361672e7ccaSVladislav Yasevich kfree_skb(f_frag);
362672e7ccaSVladislav Yasevich f_frag = new;
363672e7ccaSVladislav Yasevich }
364672e7ccaSVladislav Yasevich
3651da177e4SLinus Torvalds while (pos) {
3661da177e4SLinus Torvalds
3671da177e4SLinus Torvalds pnext = pos->next;
3681da177e4SLinus Torvalds
3691da177e4SLinus Torvalds /* Update the len and data_len fields of the first fragment. */
3701da177e4SLinus Torvalds f_frag->len += pos->len;
3711da177e4SLinus Torvalds f_frag->data_len += pos->len;
3721da177e4SLinus Torvalds
3731da177e4SLinus Torvalds /* Remove the fragment from the reassembly queue. */
3748728b834SDavid S. Miller __skb_unlink(pos, queue);
3751da177e4SLinus Torvalds
3761da177e4SLinus Torvalds /* Break if we have reached the last fragment. */
3771da177e4SLinus Torvalds if (pos == l_frag)
3781da177e4SLinus Torvalds break;
3791da177e4SLinus Torvalds pos->next = pnext;
3801da177e4SLinus Torvalds pos = pnext;
3813ff50b79SStephen Hemminger }
3821da177e4SLinus Torvalds
3831da177e4SLinus Torvalds event = sctp_skb2event(f_frag);
384b01a2407SEric W. Biederman SCTP_INC_STATS(net, SCTP_MIB_REASMUSRMSGS);
3851da177e4SLinus Torvalds
3861da177e4SLinus Torvalds return event;
3871da177e4SLinus Torvalds }
3881da177e4SLinus Torvalds
3891da177e4SLinus Torvalds
3901da177e4SLinus Torvalds /* Helper function to check if an incoming chunk has filled up the last
3911da177e4SLinus Torvalds * missing fragment in a SCTP datagram and return the corresponding event.
3921da177e4SLinus Torvalds */
sctp_ulpq_retrieve_reassembled(struct sctp_ulpq * ulpq)39301f2d384SVlad Yasevich static struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_ulpq *ulpq)
3941da177e4SLinus Torvalds {
3951da177e4SLinus Torvalds struct sk_buff *pos;
3961da177e4SLinus Torvalds struct sctp_ulpevent *cevent;
3971da177e4SLinus Torvalds struct sk_buff *first_frag = NULL;
3981da177e4SLinus Torvalds __u32 ctsn, next_tsn;
3991da177e4SLinus Torvalds struct sctp_ulpevent *retval = NULL;
400d49d91d7SVlad Yasevich struct sk_buff *pd_first = NULL;
401d49d91d7SVlad Yasevich struct sk_buff *pd_last = NULL;
402d49d91d7SVlad Yasevich size_t pd_len = 0;
403d49d91d7SVlad Yasevich struct sctp_association *asoc;
404d49d91d7SVlad Yasevich u32 pd_point;
4051da177e4SLinus Torvalds
4061da177e4SLinus Torvalds /* Initialized to 0 just to avoid compiler warning message. Will
4071da177e4SLinus Torvalds * never be used with this value. It is referenced only after it
4081da177e4SLinus Torvalds * is set when we find the first fragment of a message.
4091da177e4SLinus Torvalds */
4101da177e4SLinus Torvalds next_tsn = 0;
4111da177e4SLinus Torvalds
4121da177e4SLinus Torvalds /* The chunks are held in the reasm queue sorted by TSN.
4131da177e4SLinus Torvalds * Walk through the queue sequentially and look for a sequence of
4141da177e4SLinus Torvalds * fragmented chunks that complete a datagram.
4151da177e4SLinus Torvalds * 'first_frag' and next_tsn are reset when we find a chunk which
4161da177e4SLinus Torvalds * is the first fragment of a datagram. Once these 2 fields are set
4171da177e4SLinus Torvalds * we expect to find the remaining middle fragments and the last
4181da177e4SLinus Torvalds * fragment in order. If not, first_frag is reset to NULL and we
4191da177e4SLinus Torvalds * start the next pass when we find another first fragment.
420d49d91d7SVlad Yasevich *
421d49d91d7SVlad Yasevich * There is a potential to do partial delivery if user sets
422d49d91d7SVlad Yasevich * SCTP_PARTIAL_DELIVERY_POINT option. Lets count some things here
423d49d91d7SVlad Yasevich * to see if can do PD.
4241da177e4SLinus Torvalds */
4251da177e4SLinus Torvalds skb_queue_walk(&ulpq->reasm, pos) {
4261da177e4SLinus Torvalds cevent = sctp_skb2event(pos);
4271da177e4SLinus Torvalds ctsn = cevent->tsn;
4281da177e4SLinus Torvalds
4291da177e4SLinus Torvalds switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
4301da177e4SLinus Torvalds case SCTP_DATA_FIRST_FRAG:
431d49d91d7SVlad Yasevich /* If this "FIRST_FRAG" is the first
432d49d91d7SVlad Yasevich * element in the queue, then count it towards
433d49d91d7SVlad Yasevich * possible PD.
434d49d91d7SVlad Yasevich */
4351181d629SDavid S. Miller if (skb_queue_is_first(&ulpq->reasm, pos)) {
436d49d91d7SVlad Yasevich pd_first = pos;
437d49d91d7SVlad Yasevich pd_last = pos;
438d49d91d7SVlad Yasevich pd_len = pos->len;
439d49d91d7SVlad Yasevich } else {
440d49d91d7SVlad Yasevich pd_first = NULL;
441d49d91d7SVlad Yasevich pd_last = NULL;
442d49d91d7SVlad Yasevich pd_len = 0;
443d49d91d7SVlad Yasevich }
444d49d91d7SVlad Yasevich
4451da177e4SLinus Torvalds first_frag = pos;
4461da177e4SLinus Torvalds next_tsn = ctsn + 1;
4471da177e4SLinus Torvalds break;
4481da177e4SLinus Torvalds
4491da177e4SLinus Torvalds case SCTP_DATA_MIDDLE_FRAG:
450d49d91d7SVlad Yasevich if ((first_frag) && (ctsn == next_tsn)) {
4511da177e4SLinus Torvalds next_tsn++;
452d49d91d7SVlad Yasevich if (pd_first) {
453d49d91d7SVlad Yasevich pd_last = pos;
454d49d91d7SVlad Yasevich pd_len += pos->len;
455d49d91d7SVlad Yasevich }
456d49d91d7SVlad Yasevich } else
4571da177e4SLinus Torvalds first_frag = NULL;
4581da177e4SLinus Torvalds break;
4591da177e4SLinus Torvalds
4601da177e4SLinus Torvalds case SCTP_DATA_LAST_FRAG:
4611da177e4SLinus Torvalds if (first_frag && (ctsn == next_tsn))
4621da177e4SLinus Torvalds goto found;
4631da177e4SLinus Torvalds else
4641da177e4SLinus Torvalds first_frag = NULL;
4651da177e4SLinus Torvalds break;
4663ff50b79SStephen Hemminger }
467d49d91d7SVlad Yasevich }
4681da177e4SLinus Torvalds
469d49d91d7SVlad Yasevich asoc = ulpq->asoc;
470d49d91d7SVlad Yasevich if (pd_first) {
471d49d91d7SVlad Yasevich /* Make sure we can enter partial deliver.
472d49d91d7SVlad Yasevich * We can trigger partial delivery only if framgent
473d49d91d7SVlad Yasevich * interleave is set, or the socket is not already
474d49d91d7SVlad Yasevich * in partial delivery.
475d49d91d7SVlad Yasevich */
476d49d91d7SVlad Yasevich if (!sctp_sk(asoc->base.sk)->frag_interleave &&
477d49d91d7SVlad Yasevich atomic_read(&sctp_sk(asoc->base.sk)->pd_mode))
478d49d91d7SVlad Yasevich goto done;
479d49d91d7SVlad Yasevich
480d49d91d7SVlad Yasevich cevent = sctp_skb2event(pd_first);
481d49d91d7SVlad Yasevich pd_point = sctp_sk(asoc->base.sk)->pd_point;
482d49d91d7SVlad Yasevich if (pd_point && pd_point <= pd_len) {
4834e7696d9SXin Long retval = sctp_make_reassembled_event(asoc->base.net,
484b01a2407SEric W. Biederman &ulpq->reasm,
4854e7696d9SXin Long pd_first, pd_last);
486d49d91d7SVlad Yasevich if (retval)
487d49d91d7SVlad Yasevich sctp_ulpq_set_pd(ulpq);
488d49d91d7SVlad Yasevich }
4891da177e4SLinus Torvalds }
4901da177e4SLinus Torvalds done:
4911da177e4SLinus Torvalds return retval;
4921da177e4SLinus Torvalds found:
4934e7696d9SXin Long retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
494b01a2407SEric W. Biederman &ulpq->reasm, first_frag, pos);
4951da177e4SLinus Torvalds if (retval)
4961da177e4SLinus Torvalds retval->msg_flags |= MSG_EOR;
4971da177e4SLinus Torvalds goto done;
4981da177e4SLinus Torvalds }
4991da177e4SLinus Torvalds
5001da177e4SLinus Torvalds /* Retrieve the next set of fragments of a partial message. */
sctp_ulpq_retrieve_partial(struct sctp_ulpq * ulpq)50101f2d384SVlad Yasevich static struct sctp_ulpevent *sctp_ulpq_retrieve_partial(struct sctp_ulpq *ulpq)
5021da177e4SLinus Torvalds {
5031da177e4SLinus Torvalds struct sk_buff *pos, *last_frag, *first_frag;
5041da177e4SLinus Torvalds struct sctp_ulpevent *cevent;
5051da177e4SLinus Torvalds __u32 ctsn, next_tsn;
5061da177e4SLinus Torvalds int is_last;
5071da177e4SLinus Torvalds struct sctp_ulpevent *retval;
5081da177e4SLinus Torvalds
5091da177e4SLinus Torvalds /* The chunks are held in the reasm queue sorted by TSN.
5101da177e4SLinus Torvalds * Walk through the queue sequentially and look for the first
5111da177e4SLinus Torvalds * sequence of fragmented chunks.
5121da177e4SLinus Torvalds */
5131da177e4SLinus Torvalds
5141da177e4SLinus Torvalds if (skb_queue_empty(&ulpq->reasm))
5151da177e4SLinus Torvalds return NULL;
5161da177e4SLinus Torvalds
5171da177e4SLinus Torvalds last_frag = first_frag = NULL;
5181da177e4SLinus Torvalds retval = NULL;
5191da177e4SLinus Torvalds next_tsn = 0;
5201da177e4SLinus Torvalds is_last = 0;
5211da177e4SLinus Torvalds
5221da177e4SLinus Torvalds skb_queue_walk(&ulpq->reasm, pos) {
5231da177e4SLinus Torvalds cevent = sctp_skb2event(pos);
5241da177e4SLinus Torvalds ctsn = cevent->tsn;
5251da177e4SLinus Torvalds
5261da177e4SLinus Torvalds switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
527d003b41bSLee A. Roberts case SCTP_DATA_FIRST_FRAG:
528d003b41bSLee A. Roberts if (!first_frag)
529d003b41bSLee A. Roberts return NULL;
530d003b41bSLee A. Roberts goto done;
5311da177e4SLinus Torvalds case SCTP_DATA_MIDDLE_FRAG:
5321da177e4SLinus Torvalds if (!first_frag) {
5331da177e4SLinus Torvalds first_frag = pos;
5341da177e4SLinus Torvalds next_tsn = ctsn + 1;
5351da177e4SLinus Torvalds last_frag = pos;
536d003b41bSLee A. Roberts } else if (next_tsn == ctsn) {
5371da177e4SLinus Torvalds next_tsn++;
538d003b41bSLee A. Roberts last_frag = pos;
539d003b41bSLee A. Roberts } else
5401da177e4SLinus Torvalds goto done;
5411da177e4SLinus Torvalds break;
5421da177e4SLinus Torvalds case SCTP_DATA_LAST_FRAG:
5431da177e4SLinus Torvalds if (!first_frag)
5441da177e4SLinus Torvalds first_frag = pos;
5451da177e4SLinus Torvalds else if (ctsn != next_tsn)
5461da177e4SLinus Torvalds goto done;
5471da177e4SLinus Torvalds last_frag = pos;
5481da177e4SLinus Torvalds is_last = 1;
5491da177e4SLinus Torvalds goto done;
5501da177e4SLinus Torvalds default:
5511da177e4SLinus Torvalds return NULL;
5523ff50b79SStephen Hemminger }
5531da177e4SLinus Torvalds }
5541da177e4SLinus Torvalds
5551da177e4SLinus Torvalds /* We have the reassembled event. There is no need to look
5561da177e4SLinus Torvalds * further.
5571da177e4SLinus Torvalds */
5581da177e4SLinus Torvalds done:
5594e7696d9SXin Long retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
5604e7696d9SXin Long first_frag, last_frag);
5611da177e4SLinus Torvalds if (retval && is_last)
5621da177e4SLinus Torvalds retval->msg_flags |= MSG_EOR;
5631da177e4SLinus Torvalds
5641da177e4SLinus Torvalds return retval;
5651da177e4SLinus Torvalds }
5661da177e4SLinus Torvalds
5671da177e4SLinus Torvalds
5681da177e4SLinus Torvalds /* Helper function to reassemble chunks. Hold chunks on the reasm queue that
5691da177e4SLinus Torvalds * need reassembling.
5701da177e4SLinus Torvalds */
sctp_ulpq_reasm(struct sctp_ulpq * ulpq,struct sctp_ulpevent * event)5711da177e4SLinus Torvalds static struct sctp_ulpevent *sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
5721da177e4SLinus Torvalds struct sctp_ulpevent *event)
5731da177e4SLinus Torvalds {
5741da177e4SLinus Torvalds struct sctp_ulpevent *retval = NULL;
5751da177e4SLinus Torvalds
5761da177e4SLinus Torvalds /* Check if this is part of a fragmented message. */
5771da177e4SLinus Torvalds if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
5781da177e4SLinus Torvalds event->msg_flags |= MSG_EOR;
5791da177e4SLinus Torvalds return event;
5801da177e4SLinus Torvalds }
5811da177e4SLinus Torvalds
5821da177e4SLinus Torvalds sctp_ulpq_store_reasm(ulpq, event);
5831da177e4SLinus Torvalds if (!ulpq->pd_mode)
5841da177e4SLinus Torvalds retval = sctp_ulpq_retrieve_reassembled(ulpq);
5851da177e4SLinus Torvalds else {
5861da177e4SLinus Torvalds __u32 ctsn, ctsnap;
5871da177e4SLinus Torvalds
5881da177e4SLinus Torvalds /* Do not even bother unless this is the next tsn to
5891da177e4SLinus Torvalds * be delivered.
5901da177e4SLinus Torvalds */
5911da177e4SLinus Torvalds ctsn = event->tsn;
5921da177e4SLinus Torvalds ctsnap = sctp_tsnmap_get_ctsn(&ulpq->asoc->peer.tsn_map);
5931da177e4SLinus Torvalds if (TSN_lte(ctsn, ctsnap))
5941da177e4SLinus Torvalds retval = sctp_ulpq_retrieve_partial(ulpq);
5951da177e4SLinus Torvalds }
5961da177e4SLinus Torvalds
5971da177e4SLinus Torvalds return retval;
5981da177e4SLinus Torvalds }
5991da177e4SLinus Torvalds
6001da177e4SLinus Torvalds /* Retrieve the first part (sequential fragments) for partial delivery. */
sctp_ulpq_retrieve_first(struct sctp_ulpq * ulpq)60101f2d384SVlad Yasevich static struct sctp_ulpevent *sctp_ulpq_retrieve_first(struct sctp_ulpq *ulpq)
6021da177e4SLinus Torvalds {
6031da177e4SLinus Torvalds struct sk_buff *pos, *last_frag, *first_frag;
6041da177e4SLinus Torvalds struct sctp_ulpevent *cevent;
6051da177e4SLinus Torvalds __u32 ctsn, next_tsn;
6061da177e4SLinus Torvalds struct sctp_ulpevent *retval;
6071da177e4SLinus Torvalds
6081da177e4SLinus Torvalds /* The chunks are held in the reasm queue sorted by TSN.
6091da177e4SLinus Torvalds * Walk through the queue sequentially and look for a sequence of
6101da177e4SLinus Torvalds * fragmented chunks that start a datagram.
6111da177e4SLinus Torvalds */
6121da177e4SLinus Torvalds
6131da177e4SLinus Torvalds if (skb_queue_empty(&ulpq->reasm))
6141da177e4SLinus Torvalds return NULL;
6151da177e4SLinus Torvalds
6161da177e4SLinus Torvalds last_frag = first_frag = NULL;
6171da177e4SLinus Torvalds retval = NULL;
6181da177e4SLinus Torvalds next_tsn = 0;
6191da177e4SLinus Torvalds
6201da177e4SLinus Torvalds skb_queue_walk(&ulpq->reasm, pos) {
6211da177e4SLinus Torvalds cevent = sctp_skb2event(pos);
6221da177e4SLinus Torvalds ctsn = cevent->tsn;
6231da177e4SLinus Torvalds
6241da177e4SLinus Torvalds switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
6251da177e4SLinus Torvalds case SCTP_DATA_FIRST_FRAG:
6261da177e4SLinus Torvalds if (!first_frag) {
6271da177e4SLinus Torvalds first_frag = pos;
6281da177e4SLinus Torvalds next_tsn = ctsn + 1;
6291da177e4SLinus Torvalds last_frag = pos;
6301da177e4SLinus Torvalds } else
6311da177e4SLinus Torvalds goto done;
6321da177e4SLinus Torvalds break;
6331da177e4SLinus Torvalds
6341da177e4SLinus Torvalds case SCTP_DATA_MIDDLE_FRAG:
6351da177e4SLinus Torvalds if (!first_frag)
6361da177e4SLinus Torvalds return NULL;
6371da177e4SLinus Torvalds if (ctsn == next_tsn) {
6381da177e4SLinus Torvalds next_tsn++;
6391da177e4SLinus Torvalds last_frag = pos;
6401da177e4SLinus Torvalds } else
6411da177e4SLinus Torvalds goto done;
6421da177e4SLinus Torvalds break;
643d003b41bSLee A. Roberts
644d003b41bSLee A. Roberts case SCTP_DATA_LAST_FRAG:
645d003b41bSLee A. Roberts if (!first_frag)
646d003b41bSLee A. Roberts return NULL;
647d003b41bSLee A. Roberts else
648d003b41bSLee A. Roberts goto done;
649d003b41bSLee A. Roberts break;
650d003b41bSLee A. Roberts
6511da177e4SLinus Torvalds default:
6521da177e4SLinus Torvalds return NULL;
6533ff50b79SStephen Hemminger }
6541da177e4SLinus Torvalds }
6551da177e4SLinus Torvalds
6561da177e4SLinus Torvalds /* We have the reassembled event. There is no need to look
6571da177e4SLinus Torvalds * further.
6581da177e4SLinus Torvalds */
6591da177e4SLinus Torvalds done:
6604e7696d9SXin Long retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
6614e7696d9SXin Long first_frag, last_frag);
6621da177e4SLinus Torvalds return retval;
6631da177e4SLinus Torvalds }
6641da177e4SLinus Torvalds
665ea2dfb37SVlad Yasevich /*
666ea2dfb37SVlad Yasevich * Flush out stale fragments from the reassembly queue when processing
667ea2dfb37SVlad Yasevich * a Forward TSN.
668ea2dfb37SVlad Yasevich *
669ea2dfb37SVlad Yasevich * RFC 3758, Section 3.6
670ea2dfb37SVlad Yasevich *
671ea2dfb37SVlad Yasevich * After receiving and processing a FORWARD TSN, the data receiver MUST
672ea2dfb37SVlad Yasevich * take cautions in updating its re-assembly queue. The receiver MUST
673ea2dfb37SVlad Yasevich * remove any partially reassembled message, which is still missing one
674ea2dfb37SVlad Yasevich * or more TSNs earlier than or equal to the new cumulative TSN point.
675ea2dfb37SVlad Yasevich * In the event that the receiver has invoked the partial delivery API,
676ea2dfb37SVlad Yasevich * a notification SHOULD also be generated to inform the upper layer API
677ea2dfb37SVlad Yasevich * that the message being partially delivered will NOT be completed.
678ea2dfb37SVlad Yasevich */
sctp_ulpq_reasm_flushtsn(struct sctp_ulpq * ulpq,__u32 fwd_tsn)679ea2dfb37SVlad Yasevich void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 fwd_tsn)
680ea2dfb37SVlad Yasevich {
681ea2dfb37SVlad Yasevich struct sk_buff *pos, *tmp;
682ea2dfb37SVlad Yasevich struct sctp_ulpevent *event;
683ea2dfb37SVlad Yasevich __u32 tsn;
684ea2dfb37SVlad Yasevich
685ea2dfb37SVlad Yasevich if (skb_queue_empty(&ulpq->reasm))
686ea2dfb37SVlad Yasevich return;
687ea2dfb37SVlad Yasevich
688ea2dfb37SVlad Yasevich skb_queue_walk_safe(&ulpq->reasm, pos, tmp) {
689ea2dfb37SVlad Yasevich event = sctp_skb2event(pos);
690ea2dfb37SVlad Yasevich tsn = event->tsn;
691ea2dfb37SVlad Yasevich
692ea2dfb37SVlad Yasevich /* Since the entire message must be abandoned by the
693ea2dfb37SVlad Yasevich * sender (item A3 in Section 3.5, RFC 3758), we can
694ea2dfb37SVlad Yasevich * free all fragments on the list that are less then
695ea2dfb37SVlad Yasevich * or equal to ctsn_point
696ea2dfb37SVlad Yasevich */
697ea2dfb37SVlad Yasevich if (TSN_lte(tsn, fwd_tsn)) {
698ea2dfb37SVlad Yasevich __skb_unlink(pos, &ulpq->reasm);
699ea2dfb37SVlad Yasevich sctp_ulpevent_free(event);
700ea2dfb37SVlad Yasevich } else
701ea2dfb37SVlad Yasevich break;
702ea2dfb37SVlad Yasevich }
703ea2dfb37SVlad Yasevich }
704ea2dfb37SVlad Yasevich
705ef5d4cf2SVlad Yasevich /*
706ef5d4cf2SVlad Yasevich * Drain the reassembly queue. If we just cleared parted delivery, it
707ef5d4cf2SVlad Yasevich * is possible that the reassembly queue will contain already reassembled
708ef5d4cf2SVlad Yasevich * messages. Retrieve any such messages and give them to the user.
709ef5d4cf2SVlad Yasevich */
sctp_ulpq_reasm_drain(struct sctp_ulpq * ulpq)710ef5d4cf2SVlad Yasevich static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq)
711ef5d4cf2SVlad Yasevich {
712ef5d4cf2SVlad Yasevich struct sctp_ulpevent *event = NULL;
713ef5d4cf2SVlad Yasevich
714ef5d4cf2SVlad Yasevich if (skb_queue_empty(&ulpq->reasm))
715ef5d4cf2SVlad Yasevich return;
716ef5d4cf2SVlad Yasevich
717ef5d4cf2SVlad Yasevich while ((event = sctp_ulpq_retrieve_reassembled(ulpq)) != NULL) {
718925b9374SDavid Miller struct sk_buff_head temp;
719925b9374SDavid Miller
720ef5d4cf2SVlad Yasevich skb_queue_head_init(&temp);
721ef5d4cf2SVlad Yasevich __skb_queue_tail(&temp, sctp_event2skb(event));
722ef5d4cf2SVlad Yasevich
723925b9374SDavid Miller /* Do ordering if needed. */
724925b9374SDavid Miller if (event->msg_flags & MSG_EOR)
725ef5d4cf2SVlad Yasevich event = sctp_ulpq_order(ulpq, event);
726ef5d4cf2SVlad Yasevich
727ef5d4cf2SVlad Yasevich /* Send event to the ULP. 'event' is the
728ef5d4cf2SVlad Yasevich * sctp_ulpevent for very first SKB on the temp' list.
729ef5d4cf2SVlad Yasevich */
730ef5d4cf2SVlad Yasevich if (event)
731013b96ecSDavid Miller sctp_ulpq_tail_event(ulpq, &temp);
732ef5d4cf2SVlad Yasevich }
733ef5d4cf2SVlad Yasevich }
734ef5d4cf2SVlad Yasevich
735ef5d4cf2SVlad Yasevich
7361da177e4SLinus Torvalds /* Helper function to gather skbs that have possibly become
737b8d7a7c6SRandy Dunlap * ordered by an incoming chunk.
7381da177e4SLinus Torvalds */
sctp_ulpq_retrieve_ordered(struct sctp_ulpq * ulpq,struct sctp_ulpevent * event)73901f2d384SVlad Yasevich static void sctp_ulpq_retrieve_ordered(struct sctp_ulpq *ulpq,
7401da177e4SLinus Torvalds struct sctp_ulpevent *event)
7411da177e4SLinus Torvalds {
7428728b834SDavid S. Miller struct sk_buff_head *event_list;
7431da177e4SLinus Torvalds struct sk_buff *pos, *tmp;
7441da177e4SLinus Torvalds struct sctp_ulpevent *cevent;
745a8386317SXin Long struct sctp_stream *stream;
746efea2c6bSHagen Paul Pfeifer __u16 sid, csid, cssn;
7471da177e4SLinus Torvalds
7481da177e4SLinus Torvalds sid = event->stream;
749cee360abSXin Long stream = &ulpq->asoc->stream;
7501da177e4SLinus Torvalds
7518728b834SDavid S. Miller event_list = (struct sk_buff_head *) sctp_event2skb(event)->prev;
7528728b834SDavid S. Miller
7531da177e4SLinus Torvalds /* We are holding the chunks by stream, by SSN. */
7541da177e4SLinus Torvalds sctp_skb_for_each(pos, &ulpq->lobby, tmp) {
7551da177e4SLinus Torvalds cevent = (struct sctp_ulpevent *) pos->cb;
7561da177e4SLinus Torvalds csid = cevent->stream;
7571da177e4SLinus Torvalds cssn = cevent->ssn;
7581da177e4SLinus Torvalds
7591da177e4SLinus Torvalds /* Have we gone too far? */
7601da177e4SLinus Torvalds if (csid > sid)
7611da177e4SLinus Torvalds break;
7621da177e4SLinus Torvalds
7631da177e4SLinus Torvalds /* Have we not gone far enough? */
7641da177e4SLinus Torvalds if (csid < sid)
7651da177e4SLinus Torvalds continue;
7661da177e4SLinus Torvalds
767a8386317SXin Long if (cssn != sctp_ssn_peek(stream, in, sid))
7681da177e4SLinus Torvalds break;
7691da177e4SLinus Torvalds
770a8386317SXin Long /* Found it, so mark in the stream. */
771a8386317SXin Long sctp_ssn_next(stream, in, sid);
7721da177e4SLinus Torvalds
7738728b834SDavid S. Miller __skb_unlink(pos, &ulpq->lobby);
7741da177e4SLinus Torvalds
7751da177e4SLinus Torvalds /* Attach all gathered skbs to the event. */
7768728b834SDavid S. Miller __skb_queue_tail(event_list, pos);
7771da177e4SLinus Torvalds }
7781da177e4SLinus Torvalds }
7791da177e4SLinus Torvalds
7801da177e4SLinus Torvalds /* Helper function to store chunks needing ordering. */
sctp_ulpq_store_ordered(struct sctp_ulpq * ulpq,struct sctp_ulpevent * event)78101f2d384SVlad Yasevich static void sctp_ulpq_store_ordered(struct sctp_ulpq *ulpq,
7821da177e4SLinus Torvalds struct sctp_ulpevent *event)
7831da177e4SLinus Torvalds {
7841da177e4SLinus Torvalds struct sk_buff *pos;
7851da177e4SLinus Torvalds struct sctp_ulpevent *cevent;
7861da177e4SLinus Torvalds __u16 sid, csid;
7871da177e4SLinus Torvalds __u16 ssn, cssn;
7881da177e4SLinus Torvalds
7891da177e4SLinus Torvalds pos = skb_peek_tail(&ulpq->lobby);
7901da177e4SLinus Torvalds if (!pos) {
7911da177e4SLinus Torvalds __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
7921da177e4SLinus Torvalds return;
7931da177e4SLinus Torvalds }
7941da177e4SLinus Torvalds
7951da177e4SLinus Torvalds sid = event->stream;
7961da177e4SLinus Torvalds ssn = event->ssn;
7971da177e4SLinus Torvalds
7981da177e4SLinus Torvalds cevent = (struct sctp_ulpevent *) pos->cb;
7991da177e4SLinus Torvalds csid = cevent->stream;
8001da177e4SLinus Torvalds cssn = cevent->ssn;
8011da177e4SLinus Torvalds if (sid > csid) {
8021da177e4SLinus Torvalds __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
8031da177e4SLinus Torvalds return;
8041da177e4SLinus Torvalds }
8051da177e4SLinus Torvalds
8061da177e4SLinus Torvalds if ((sid == csid) && SSN_lt(cssn, ssn)) {
8071da177e4SLinus Torvalds __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
8081da177e4SLinus Torvalds return;
8091da177e4SLinus Torvalds }
8101da177e4SLinus Torvalds
8111da177e4SLinus Torvalds /* Find the right place in this list. We store them by
8121da177e4SLinus Torvalds * stream ID and then by SSN.
8131da177e4SLinus Torvalds */
8141da177e4SLinus Torvalds skb_queue_walk(&ulpq->lobby, pos) {
8151da177e4SLinus Torvalds cevent = (struct sctp_ulpevent *) pos->cb;
8161da177e4SLinus Torvalds csid = cevent->stream;
8171da177e4SLinus Torvalds cssn = cevent->ssn;
8181da177e4SLinus Torvalds
8191da177e4SLinus Torvalds if (csid > sid)
8201da177e4SLinus Torvalds break;
8211da177e4SLinus Torvalds if (csid == sid && SSN_lt(ssn, cssn))
8221da177e4SLinus Torvalds break;
8231da177e4SLinus Torvalds }
8241da177e4SLinus Torvalds
8251da177e4SLinus Torvalds
8261da177e4SLinus Torvalds /* Insert before pos. */
82743f59c89SDavid S. Miller __skb_queue_before(&ulpq->lobby, pos, sctp_event2skb(event));
8281da177e4SLinus Torvalds }
8291da177e4SLinus Torvalds
sctp_ulpq_order(struct sctp_ulpq * ulpq,struct sctp_ulpevent * event)8301da177e4SLinus Torvalds static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *ulpq,
8311da177e4SLinus Torvalds struct sctp_ulpevent *event)
8321da177e4SLinus Torvalds {
8331da177e4SLinus Torvalds __u16 sid, ssn;
834a8386317SXin Long struct sctp_stream *stream;
8351da177e4SLinus Torvalds
8361da177e4SLinus Torvalds /* Check if this message needs ordering. */
837bd4d627dSXin Long if (event->msg_flags & SCTP_DATA_UNORDERED)
8381da177e4SLinus Torvalds return event;
8391da177e4SLinus Torvalds
8401da177e4SLinus Torvalds /* Note: The stream ID must be verified before this routine. */
8411da177e4SLinus Torvalds sid = event->stream;
8421da177e4SLinus Torvalds ssn = event->ssn;
843cee360abSXin Long stream = &ulpq->asoc->stream;
8441da177e4SLinus Torvalds
8451da177e4SLinus Torvalds /* Is this the expected SSN for this stream ID? */
846a8386317SXin Long if (ssn != sctp_ssn_peek(stream, in, sid)) {
8471da177e4SLinus Torvalds /* We've received something out of order, so find where it
8481da177e4SLinus Torvalds * needs to be placed. We order by stream and then by SSN.
8491da177e4SLinus Torvalds */
8501da177e4SLinus Torvalds sctp_ulpq_store_ordered(ulpq, event);
8511da177e4SLinus Torvalds return NULL;
8521da177e4SLinus Torvalds }
8531da177e4SLinus Torvalds
8541da177e4SLinus Torvalds /* Mark that the next chunk has been found. */
855a8386317SXin Long sctp_ssn_next(stream, in, sid);
8561da177e4SLinus Torvalds
8571da177e4SLinus Torvalds /* Go find any other chunks that were waiting for
8581da177e4SLinus Torvalds * ordering.
8591da177e4SLinus Torvalds */
8601da177e4SLinus Torvalds sctp_ulpq_retrieve_ordered(ulpq, event);
8611da177e4SLinus Torvalds
8621da177e4SLinus Torvalds return event;
8631da177e4SLinus Torvalds }
8641da177e4SLinus Torvalds
8651da177e4SLinus Torvalds /* Helper function to gather skbs that have possibly become
8661da177e4SLinus Torvalds * ordered by forward tsn skipping their dependencies.
8671da177e4SLinus Torvalds */
sctp_ulpq_reap_ordered(struct sctp_ulpq * ulpq,__u16 sid)86801f2d384SVlad Yasevich static void sctp_ulpq_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid)
8691da177e4SLinus Torvalds {
8701da177e4SLinus Torvalds struct sk_buff *pos, *tmp;
8711da177e4SLinus Torvalds struct sctp_ulpevent *cevent;
8728728b834SDavid S. Miller struct sctp_ulpevent *event;
873a8386317SXin Long struct sctp_stream *stream;
8741da177e4SLinus Torvalds struct sk_buff_head temp;
875c068be54SVlad Yasevich struct sk_buff_head *lobby = &ulpq->lobby;
8761da177e4SLinus Torvalds __u16 csid, cssn;
8771da177e4SLinus Torvalds
878cee360abSXin Long stream = &ulpq->asoc->stream;
8791da177e4SLinus Torvalds
8801da177e4SLinus Torvalds /* We are holding the chunks by stream, by SSN. */
8818728b834SDavid S. Miller skb_queue_head_init(&temp);
8828728b834SDavid S. Miller event = NULL;
883c068be54SVlad Yasevich sctp_skb_for_each(pos, lobby, tmp) {
8841da177e4SLinus Torvalds cevent = (struct sctp_ulpevent *) pos->cb;
8851da177e4SLinus Torvalds csid = cevent->stream;
8861da177e4SLinus Torvalds cssn = cevent->ssn;
8871da177e4SLinus Torvalds
888ea2dfb37SVlad Yasevich /* Have we gone too far? */
889ea2dfb37SVlad Yasevich if (csid > sid)
8901da177e4SLinus Torvalds break;
8911da177e4SLinus Torvalds
892ea2dfb37SVlad Yasevich /* Have we not gone far enough? */
893ea2dfb37SVlad Yasevich if (csid < sid)
894ea2dfb37SVlad Yasevich continue;
895ea2dfb37SVlad Yasevich
896ea2dfb37SVlad Yasevich /* see if this ssn has been marked by skipping */
897a8386317SXin Long if (!SSN_lt(cssn, sctp_ssn_peek(stream, in, csid)))
898ea2dfb37SVlad Yasevich break;
8991da177e4SLinus Torvalds
900c068be54SVlad Yasevich __skb_unlink(pos, lobby);
901ea2dfb37SVlad Yasevich if (!event)
9021da177e4SLinus Torvalds /* Create a temporary list to collect chunks on. */
9031da177e4SLinus Torvalds event = sctp_skb2event(pos);
904ea2dfb37SVlad Yasevich
9051da177e4SLinus Torvalds /* Attach all gathered skbs to the event. */
9068728b834SDavid S. Miller __skb_queue_tail(&temp, pos);
9071da177e4SLinus Torvalds }
9081da177e4SLinus Torvalds
909c068be54SVlad Yasevich /* If we didn't reap any data, see if the next expected SSN
910c068be54SVlad Yasevich * is next on the queue and if so, use that.
911c068be54SVlad Yasevich */
912c068be54SVlad Yasevich if (event == NULL && pos != (struct sk_buff *)lobby) {
913c068be54SVlad Yasevich cevent = (struct sctp_ulpevent *) pos->cb;
914c068be54SVlad Yasevich csid = cevent->stream;
915c068be54SVlad Yasevich cssn = cevent->ssn;
916c068be54SVlad Yasevich
917a8386317SXin Long if (csid == sid && cssn == sctp_ssn_peek(stream, in, csid)) {
918a8386317SXin Long sctp_ssn_next(stream, in, csid);
919c068be54SVlad Yasevich __skb_unlink(pos, lobby);
920c068be54SVlad Yasevich __skb_queue_tail(&temp, pos);
921c068be54SVlad Yasevich event = sctp_skb2event(pos);
922c068be54SVlad Yasevich }
923c068be54SVlad Yasevich }
924c068be54SVlad Yasevich
9258728b834SDavid S. Miller /* Send event to the ULP. 'event' is the sctp_ulpevent for
9268728b834SDavid S. Miller * very first SKB on the 'temp' list.
9278728b834SDavid S. Miller */
928ea2dfb37SVlad Yasevich if (event) {
929ea2dfb37SVlad Yasevich /* see if we have more ordered that we can deliver */
930ea2dfb37SVlad Yasevich sctp_ulpq_retrieve_ordered(ulpq, event);
931013b96ecSDavid Miller sctp_ulpq_tail_event(ulpq, &temp);
9321da177e4SLinus Torvalds }
933ea2dfb37SVlad Yasevich }
9341da177e4SLinus Torvalds
935ea2dfb37SVlad Yasevich /* Skip over an SSN. This is used during the processing of
936ea2dfb37SVlad Yasevich * Forwared TSN chunk to skip over the abandoned ordered data
937ea2dfb37SVlad Yasevich */
sctp_ulpq_skip(struct sctp_ulpq * ulpq,__u16 sid,__u16 ssn)9381da177e4SLinus Torvalds void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn)
9391da177e4SLinus Torvalds {
940a8386317SXin Long struct sctp_stream *stream;
9411da177e4SLinus Torvalds
9421da177e4SLinus Torvalds /* Note: The stream ID must be verified before this routine. */
943cee360abSXin Long stream = &ulpq->asoc->stream;
9441da177e4SLinus Torvalds
9451da177e4SLinus Torvalds /* Is this an old SSN? If so ignore. */
946a8386317SXin Long if (SSN_lt(ssn, sctp_ssn_peek(stream, in, sid)))
9471da177e4SLinus Torvalds return;
9481da177e4SLinus Torvalds
9491da177e4SLinus Torvalds /* Mark that we are no longer expecting this SSN or lower. */
950a8386317SXin Long sctp_ssn_skip(stream, in, sid, ssn);
9511da177e4SLinus Torvalds
9521da177e4SLinus Torvalds /* Go find any other chunks that were waiting for
9531da177e4SLinus Torvalds * ordering and deliver them if needed.
9541da177e4SLinus Torvalds */
955ea2dfb37SVlad Yasevich sctp_ulpq_reap_ordered(ulpq, sid);
9561da177e4SLinus Torvalds }
9571da177e4SLinus Torvalds
sctp_ulpq_renege_list(struct sctp_ulpq * ulpq,struct sk_buff_head * list,__u16 needed)95894014e8dSXin Long __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq, struct sk_buff_head *list,
95994014e8dSXin Long __u16 needed)
9601da177e4SLinus Torvalds {
9611da177e4SLinus Torvalds __u16 freed = 0;
96295ac7b85SLee A. Roberts __u32 tsn, last_tsn;
96395ac7b85SLee A. Roberts struct sk_buff *skb, *flist, *last;
9641da177e4SLinus Torvalds struct sctp_ulpevent *event;
9651da177e4SLinus Torvalds struct sctp_tsnmap *tsnmap;
9661da177e4SLinus Torvalds
9671da177e4SLinus Torvalds tsnmap = &ulpq->asoc->peer.tsn_map;
9681da177e4SLinus Torvalds
969e67f85ecSLee A. Roberts while ((skb = skb_peek_tail(list)) != NULL) {
9701da177e4SLinus Torvalds event = sctp_skb2event(skb);
9711da177e4SLinus Torvalds tsn = event->tsn;
9721da177e4SLinus Torvalds
973e67f85ecSLee A. Roberts /* Don't renege below the Cumulative TSN ACK Point. */
974e67f85ecSLee A. Roberts if (TSN_lte(tsn, sctp_tsnmap_get_ctsn(tsnmap)))
975e67f85ecSLee A. Roberts break;
976e67f85ecSLee A. Roberts
97795ac7b85SLee A. Roberts /* Events in ordering queue may have multiple fragments
97895ac7b85SLee A. Roberts * corresponding to additional TSNs. Sum the total
97995ac7b85SLee A. Roberts * freed space; find the last TSN.
98095ac7b85SLee A. Roberts */
981e67f85ecSLee A. Roberts freed += skb_headlen(skb);
98295ac7b85SLee A. Roberts flist = skb_shinfo(skb)->frag_list;
98395ac7b85SLee A. Roberts for (last = flist; flist; flist = flist->next) {
98495ac7b85SLee A. Roberts last = flist;
98595ac7b85SLee A. Roberts freed += skb_headlen(last);
98695ac7b85SLee A. Roberts }
98795ac7b85SLee A. Roberts if (last)
98895ac7b85SLee A. Roberts last_tsn = sctp_skb2event(last)->tsn;
98995ac7b85SLee A. Roberts else
99095ac7b85SLee A. Roberts last_tsn = tsn;
99195ac7b85SLee A. Roberts
99295ac7b85SLee A. Roberts /* Unlink the event, then renege all applicable TSNs. */
99395ac7b85SLee A. Roberts __skb_unlink(skb, list);
9941da177e4SLinus Torvalds sctp_ulpevent_free(event);
99595ac7b85SLee A. Roberts while (TSN_lte(tsn, last_tsn)) {
9961da177e4SLinus Torvalds sctp_tsnmap_renege(tsnmap, tsn);
99795ac7b85SLee A. Roberts tsn++;
99895ac7b85SLee A. Roberts }
9991da177e4SLinus Torvalds if (freed >= needed)
10001da177e4SLinus Torvalds return freed;
10011da177e4SLinus Torvalds }
10021da177e4SLinus Torvalds
10031da177e4SLinus Torvalds return freed;
10041da177e4SLinus Torvalds }
10051da177e4SLinus Torvalds
100616d14ef9SPavel Emelyanov /* Renege 'needed' bytes from the ordering queue. */
sctp_ulpq_renege_order(struct sctp_ulpq * ulpq,__u16 needed)100716d14ef9SPavel Emelyanov static __u16 sctp_ulpq_renege_order(struct sctp_ulpq *ulpq, __u16 needed)
100816d14ef9SPavel Emelyanov {
100916d14ef9SPavel Emelyanov return sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed);
101016d14ef9SPavel Emelyanov }
101116d14ef9SPavel Emelyanov
10121da177e4SLinus Torvalds /* Renege 'needed' bytes from the reassembly queue. */
sctp_ulpq_renege_frags(struct sctp_ulpq * ulpq,__u16 needed)10131da177e4SLinus Torvalds static __u16 sctp_ulpq_renege_frags(struct sctp_ulpq *ulpq, __u16 needed)
10141da177e4SLinus Torvalds {
101516d14ef9SPavel Emelyanov return sctp_ulpq_renege_list(ulpq, &ulpq->reasm, needed);
10161da177e4SLinus Torvalds }
10171da177e4SLinus Torvalds
10181da177e4SLinus Torvalds /* Partial deliver the first message as there is pressure on rwnd. */
sctp_ulpq_partial_delivery(struct sctp_ulpq * ulpq,gfp_t gfp)10191da177e4SLinus Torvalds void sctp_ulpq_partial_delivery(struct sctp_ulpq *ulpq,
1020dd0fc66fSAl Viro gfp_t gfp)
10211da177e4SLinus Torvalds {
10221da177e4SLinus Torvalds struct sctp_ulpevent *event;
10231da177e4SLinus Torvalds struct sctp_association *asoc;
1024b6e1331fSVlad Yasevich struct sctp_sock *sp;
1025d003b41bSLee A. Roberts __u32 ctsn;
1026d003b41bSLee A. Roberts struct sk_buff *skb;
10271da177e4SLinus Torvalds
10281da177e4SLinus Torvalds asoc = ulpq->asoc;
1029b6e1331fSVlad Yasevich sp = sctp_sk(asoc->base.sk);
10301da177e4SLinus Torvalds
1031b6e1331fSVlad Yasevich /* If the association is already in Partial Delivery mode
1032d003b41bSLee A. Roberts * we have nothing to do.
1033b6e1331fSVlad Yasevich */
1034b6e1331fSVlad Yasevich if (ulpq->pd_mode)
1035b6e1331fSVlad Yasevich return;
10361da177e4SLinus Torvalds
1037d003b41bSLee A. Roberts /* Data must be at or below the Cumulative TSN ACK Point to
1038d003b41bSLee A. Roberts * start partial delivery.
1039d003b41bSLee A. Roberts */
1040d003b41bSLee A. Roberts skb = skb_peek(&asoc->ulpq.reasm);
1041d003b41bSLee A. Roberts if (skb != NULL) {
1042d003b41bSLee A. Roberts ctsn = sctp_skb2event(skb)->tsn;
1043d003b41bSLee A. Roberts if (!TSN_lte(ctsn, sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)))
1044d003b41bSLee A. Roberts return;
1045d003b41bSLee A. Roberts }
1046d003b41bSLee A. Roberts
1047b6e1331fSVlad Yasevich /* If the user enabled fragment interleave socket option,
1048b6e1331fSVlad Yasevich * multiple associations can enter partial delivery.
1049b6e1331fSVlad Yasevich * Otherwise, we can only enter partial delivery if the
1050b6e1331fSVlad Yasevich * socket is not in partial deliver mode.
1051b6e1331fSVlad Yasevich */
1052b6e1331fSVlad Yasevich if (sp->frag_interleave || atomic_read(&sp->pd_mode) == 0) {
10531da177e4SLinus Torvalds /* Is partial delivery possible? */
10541da177e4SLinus Torvalds event = sctp_ulpq_retrieve_first(ulpq);
10551da177e4SLinus Torvalds /* Send event to the ULP. */
10561da177e4SLinus Torvalds if (event) {
1057925b9374SDavid Miller struct sk_buff_head temp;
1058925b9374SDavid Miller
1059925b9374SDavid Miller skb_queue_head_init(&temp);
1060925b9374SDavid Miller __skb_queue_tail(&temp, sctp_event2skb(event));
1061013b96ecSDavid Miller sctp_ulpq_tail_event(ulpq, &temp);
1062d49d91d7SVlad Yasevich sctp_ulpq_set_pd(ulpq);
10631da177e4SLinus Torvalds return;
10641da177e4SLinus Torvalds }
10651da177e4SLinus Torvalds }
10661da177e4SLinus Torvalds }
10671da177e4SLinus Torvalds
10681da177e4SLinus Torvalds /* Renege some packets to make room for an incoming chunk. */
sctp_ulpq_renege(struct sctp_ulpq * ulpq,struct sctp_chunk * chunk,gfp_t gfp)10691da177e4SLinus Torvalds void sctp_ulpq_renege(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
1070dd0fc66fSAl Viro gfp_t gfp)
10711da177e4SLinus Torvalds {
10725c468674SXin Long struct sctp_association *asoc = ulpq->asoc;
10735c468674SXin Long __u32 freed = 0;
10745c468674SXin Long __u16 needed;
10751da177e4SLinus Torvalds
10765c468674SXin Long needed = ntohs(chunk->chunk_hdr->length) -
10775c468674SXin Long sizeof(struct sctp_data_chunk);
10781da177e4SLinus Torvalds
10791da177e4SLinus Torvalds if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) {
10801da177e4SLinus Torvalds freed = sctp_ulpq_renege_order(ulpq, needed);
10815c468674SXin Long if (freed < needed)
10821da177e4SLinus Torvalds freed += sctp_ulpq_renege_frags(ulpq, needed - freed);
10831da177e4SLinus Torvalds }
10841da177e4SLinus Torvalds /* If able to free enough room, accept this chunk. */
10859dde27deSXin Long if (sk_rmem_schedule(asoc->base.sk, chunk->skb, needed) &&
10869dde27deSXin Long freed >= needed) {
10875c468674SXin Long int retval = sctp_ulpq_tail_data(ulpq, chunk, gfp);
1088d003b41bSLee A. Roberts /*
1089d003b41bSLee A. Roberts * Enter partial delivery if chunk has not been
1090d003b41bSLee A. Roberts * delivered; otherwise, drain the reassembly queue.
1091d003b41bSLee A. Roberts */
1092d003b41bSLee A. Roberts if (retval <= 0)
1093b26ddd81SNeil Horman sctp_ulpq_partial_delivery(ulpq, gfp);
1094d003b41bSLee A. Roberts else if (retval == 1)
1095d003b41bSLee A. Roberts sctp_ulpq_reasm_drain(ulpq);
10961da177e4SLinus Torvalds }
10971da177e4SLinus Torvalds }
10981da177e4SLinus Torvalds
10991da177e4SLinus Torvalds /* Notify the application if an association is aborted and in
11001da177e4SLinus Torvalds * partial delivery mode. Send up any pending received messages.
11011da177e4SLinus Torvalds */
sctp_ulpq_abort_pd(struct sctp_ulpq * ulpq,gfp_t gfp)1102dd0fc66fSAl Viro void sctp_ulpq_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
11031da177e4SLinus Torvalds {
11041da177e4SLinus Torvalds struct sctp_ulpevent *ev = NULL;
11050970f5b3SMarcelo Ricardo Leitner struct sctp_sock *sp;
11062cc0eeb6SXin Long struct sock *sk;
11071da177e4SLinus Torvalds
11081da177e4SLinus Torvalds if (!ulpq->pd_mode)
11091da177e4SLinus Torvalds return;
11101da177e4SLinus Torvalds
11111da177e4SLinus Torvalds sk = ulpq->asoc->base.sk;
11120970f5b3SMarcelo Ricardo Leitner sp = sctp_sk(sk);
1113a1e3a059SXin Long if (sctp_ulpevent_type_enabled(ulpq->asoc->subscribe,
11142cc0eeb6SXin Long SCTP_PARTIAL_DELIVERY_EVENT))
11151da177e4SLinus Torvalds ev = sctp_ulpevent_make_pdapi(ulpq->asoc,
11161da177e4SLinus Torvalds SCTP_PARTIAL_DELIVERY_ABORTED,
111765f5e357SXin Long 0, 0, 0, gfp);
11181da177e4SLinus Torvalds if (ev)
11191da177e4SLinus Torvalds __skb_queue_tail(&sk->sk_receive_queue, sctp_event2skb(ev));
11201da177e4SLinus Torvalds
11211da177e4SLinus Torvalds /* If there is data waiting, send it up the socket now. */
11220970f5b3SMarcelo Ricardo Leitner if ((sctp_ulpq_clear_pd(ulpq) || ev) && !sp->data_ready_signalled) {
11230970f5b3SMarcelo Ricardo Leitner sp->data_ready_signalled = 1;
11240970f5b3SMarcelo Ricardo Leitner sk->sk_data_ready(sk);
11250970f5b3SMarcelo Ricardo Leitner }
11261da177e4SLinus Torvalds }
1127