/* SCTP kernel reference Implementation
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/* SCTP kernel reference Implementation
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001-2003 Intel Corp.
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* Copyright (c) 2001-2003 Intel Corp.
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* Copyright (c) 2001-2003 International Business Machines Corp.
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* Copyright (c) 2001-2003 International Business Machines Corp.
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*
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*
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* This file is part of the SCTP kernel reference Implementation
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* This file is part of the SCTP kernel reference Implementation
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*
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*
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* These functions implement the sctp_outq class. The outqueue handles
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* These functions implement the sctp_outq class. The outqueue handles
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* bundling and queueing of outgoing SCTP chunks.
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* bundling and queueing of outgoing SCTP chunks.
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*
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*
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* The SCTP reference implementation is free software;
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* The SCTP reference implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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* any later version.
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*
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*
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* The SCTP reference implementation is distributed in the hope that it
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* The SCTP reference implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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* See the GNU General Public License for more details.
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*
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*
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* You should have received a copy of the GNU General Public License
|
* You should have received a copy of the GNU General Public License
|
* along with GNU CC; see the file COPYING. If not, write to
|
* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* Boston, MA 02111-1307, USA.
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*
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*
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* Please send any bug reports or fixes you make to the
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* email address(es):
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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*
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*
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* Or submit a bug report through the following website:
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* Or submit a bug report through the following website:
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* http://www.sf.net/projects/lksctp
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* http://www.sf.net/projects/lksctp
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*
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*
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* Written or modified by:
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* Written or modified by:
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* La Monte H.P. Yarroll <piggy@acm.org>
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Perry Melange <pmelange@null.cc.uic.edu>
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* Perry Melange <pmelange@null.cc.uic.edu>
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* Xingang Guo <xingang.guo@intel.com>
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* Xingang Guo <xingang.guo@intel.com>
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* Hui Huang <hui.huang@nokia.com>
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* Hui Huang <hui.huang@nokia.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Jon Grimm <jgrimm@us.ibm.com>
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*
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*
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* be incorporated into the next SCTP release.
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* be incorporated into the next SCTP release.
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*/
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*/
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|
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#include <linux/types.h>
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#include <linux/types.h>
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#include <linux/list.h> /* For struct list_head */
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#include <linux/list.h> /* For struct list_head */
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#include <linux/socket.h>
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#include <linux/socket.h>
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#include <linux/ip.h>
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#include <linux/ip.h>
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#include <net/sock.h> /* For skb_set_owner_w */
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#include <net/sock.h> /* For skb_set_owner_w */
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|
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#include <net/sctp/sctp.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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#include <net/sctp/sm.h>
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|
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/* Declare internal functions here. */
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/* Declare internal functions here. */
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static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn);
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static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn);
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static void sctp_check_transmitted(struct sctp_outq *q,
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static void sctp_check_transmitted(struct sctp_outq *q,
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struct list_head *transmitted_queue,
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struct list_head *transmitted_queue,
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struct sctp_transport *transport,
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struct sctp_transport *transport,
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struct sctp_sackhdr *sack,
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struct sctp_sackhdr *sack,
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__u32 highest_new_tsn);
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__u32 highest_new_tsn);
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|
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static void sctp_mark_missing(struct sctp_outq *q,
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static void sctp_mark_missing(struct sctp_outq *q,
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struct list_head *transmitted_queue,
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struct list_head *transmitted_queue,
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struct sctp_transport *transport,
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struct sctp_transport *transport,
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__u32 highest_new_tsn,
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__u32 highest_new_tsn,
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int count_of_newacks);
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int count_of_newacks);
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|
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/* Add data to the front of the queue. */
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/* Add data to the front of the queue. */
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static inline void sctp_outq_head_data(struct sctp_outq *q,
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static inline void sctp_outq_head_data(struct sctp_outq *q,
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struct sctp_chunk *ch)
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struct sctp_chunk *ch)
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{
|
{
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__skb_queue_head(&q->out, (struct sk_buff *)ch);
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__skb_queue_head(&q->out, (struct sk_buff *)ch);
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q->out_qlen += ch->skb->len;
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q->out_qlen += ch->skb->len;
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return;
|
return;
|
}
|
}
|
|
|
/* Take data from the front of the queue. */
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/* Take data from the front of the queue. */
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static inline struct sctp_chunk *sctp_outq_dequeue_data(struct sctp_outq *q)
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static inline struct sctp_chunk *sctp_outq_dequeue_data(struct sctp_outq *q)
|
{
|
{
|
struct sctp_chunk *ch;
|
struct sctp_chunk *ch;
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ch = (struct sctp_chunk *)__skb_dequeue(&q->out);
|
ch = (struct sctp_chunk *)__skb_dequeue(&q->out);
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if (ch)
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if (ch)
|
q->out_qlen -= ch->skb->len;
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q->out_qlen -= ch->skb->len;
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return ch;
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return ch;
|
}
|
}
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/* Add data chunk to the end of the queue. */
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/* Add data chunk to the end of the queue. */
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static inline void sctp_outq_tail_data(struct sctp_outq *q,
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static inline void sctp_outq_tail_data(struct sctp_outq *q,
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struct sctp_chunk *ch)
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struct sctp_chunk *ch)
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{
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{
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__skb_queue_tail(&q->out, (struct sk_buff *)ch);
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__skb_queue_tail(&q->out, (struct sk_buff *)ch);
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q->out_qlen += ch->skb->len;
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q->out_qlen += ch->skb->len;
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return;
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return;
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}
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}
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|
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/* Insert a chunk behind chunk 'pos'. */
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/* Insert a chunk behind chunk 'pos'. */
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static inline void sctp_outq_insert_data(struct sctp_outq *q,
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static inline void sctp_outq_insert_data(struct sctp_outq *q,
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struct sctp_chunk *ch,
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struct sctp_chunk *ch,
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struct sctp_chunk *pos)
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struct sctp_chunk *pos)
|
{
|
{
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__skb_insert((struct sk_buff *)ch, (struct sk_buff *)pos->prev,
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__skb_insert((struct sk_buff *)ch, (struct sk_buff *)pos->prev,
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(struct sk_buff *)pos, pos->list);
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(struct sk_buff *)pos, pos->list);
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q->out_qlen += ch->skb->len;
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q->out_qlen += ch->skb->len;
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}
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}
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|
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/*
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/*
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* SFR-CACC algorithm:
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* SFR-CACC algorithm:
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* D) If count_of_newacks is greater than or equal to 2
|
* D) If count_of_newacks is greater than or equal to 2
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* and t was not sent to the current primary then the
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* and t was not sent to the current primary then the
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* sender MUST NOT increment missing report count for t.
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* sender MUST NOT increment missing report count for t.
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*/
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*/
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static inline int sctp_cacc_skip_3_1_d(struct sctp_transport *primary,
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static inline int sctp_cacc_skip_3_1_d(struct sctp_transport *primary,
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struct sctp_transport *transport,
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struct sctp_transport *transport,
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int count_of_newacks)
|
int count_of_newacks)
|
{
|
{
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if (count_of_newacks >=2 && transport != primary)
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if (count_of_newacks >=2 && transport != primary)
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return 1;
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return 1;
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return 0;
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return 0;
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}
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}
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|
|
/*
|
/*
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* SFR-CACC algorithm:
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* SFR-CACC algorithm:
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* F) If count_of_newacks is less than 2, let d be the
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* F) If count_of_newacks is less than 2, let d be the
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* destination to which t was sent. If cacc_saw_newack
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* destination to which t was sent. If cacc_saw_newack
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* is 0 for destination d, then the sender MUST NOT
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* is 0 for destination d, then the sender MUST NOT
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* increment missing report count for t.
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* increment missing report count for t.
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*/
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*/
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static inline int sctp_cacc_skip_3_1_f(struct sctp_transport *transport,
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static inline int sctp_cacc_skip_3_1_f(struct sctp_transport *transport,
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int count_of_newacks)
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int count_of_newacks)
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{
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{
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if (count_of_newacks < 2 && !transport->cacc.cacc_saw_newack)
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if (count_of_newacks < 2 && !transport->cacc.cacc_saw_newack)
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return 1;
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return 1;
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return 0;
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return 0;
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}
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}
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|
|
/*
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/*
|
* SFR-CACC algorithm:
|
* SFR-CACC algorithm:
|
* 3.1) If CYCLING_CHANGEOVER is 0, the sender SHOULD
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* 3.1) If CYCLING_CHANGEOVER is 0, the sender SHOULD
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* execute steps C, D, F.
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* execute steps C, D, F.
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*
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*
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* C has been implemented in sctp_outq_sack
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* C has been implemented in sctp_outq_sack
|
*/
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*/
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static inline int sctp_cacc_skip_3_1(struct sctp_transport *primary,
|
static inline int sctp_cacc_skip_3_1(struct sctp_transport *primary,
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struct sctp_transport *transport,
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struct sctp_transport *transport,
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int count_of_newacks)
|
int count_of_newacks)
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{
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{
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if (!primary->cacc.cycling_changeover) {
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if (!primary->cacc.cycling_changeover) {
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if (sctp_cacc_skip_3_1_d(primary, transport, count_of_newacks))
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if (sctp_cacc_skip_3_1_d(primary, transport, count_of_newacks))
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return 1;
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return 1;
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if (sctp_cacc_skip_3_1_f(transport, count_of_newacks))
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if (sctp_cacc_skip_3_1_f(transport, count_of_newacks))
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return 1;
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return 1;
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return 0;
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return 0;
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}
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}
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return 0;
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return 0;
|
}
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}
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|
|
/*
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/*
|
* SFR-CACC algorithm:
|
* SFR-CACC algorithm:
|
* 3.2) Else if CYCLING_CHANGEOVER is 1, and t is less
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* 3.2) Else if CYCLING_CHANGEOVER is 1, and t is less
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* than next_tsn_at_change of the current primary, then
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* than next_tsn_at_change of the current primary, then
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* the sender MUST NOT increment missing report count
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* the sender MUST NOT increment missing report count
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* for t.
|
* for t.
|
*/
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*/
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static inline int sctp_cacc_skip_3_2(struct sctp_transport *primary, __u32 tsn)
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static inline int sctp_cacc_skip_3_2(struct sctp_transport *primary, __u32 tsn)
|
{
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{
|
if (primary->cacc.cycling_changeover &&
|
if (primary->cacc.cycling_changeover &&
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TSN_lt(tsn, primary->cacc.next_tsn_at_change))
|
TSN_lt(tsn, primary->cacc.next_tsn_at_change))
|
return 1;
|
return 1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* SFR-CACC algorithm:
|
* SFR-CACC algorithm:
|
* 3) If the missing report count for TSN t is to be
|
* 3) If the missing report count for TSN t is to be
|
* incremented according to [RFC2960] and
|
* incremented according to [RFC2960] and
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* [SCTP_STEWART-2002], and CHANGEOVER_ACTIVE is set,
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* [SCTP_STEWART-2002], and CHANGEOVER_ACTIVE is set,
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* then the sender MUST futher execute steps 3.1 and
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* then the sender MUST futher execute steps 3.1 and
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* 3.2 to determine if the missing report count for
|
* 3.2 to determine if the missing report count for
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* TSN t SHOULD NOT be incremented.
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* TSN t SHOULD NOT be incremented.
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*
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*
|
* 3.3) If 3.1 and 3.2 do not dictate that the missing
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* 3.3) If 3.1 and 3.2 do not dictate that the missing
|
* report count for t should not be incremented, then
|
* report count for t should not be incremented, then
|
* the sender SOULD increment missing report count for
|
* the sender SOULD increment missing report count for
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* t (according to [RFC2960] and [SCTP_STEWART_2002]).
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* t (according to [RFC2960] and [SCTP_STEWART_2002]).
|
*/
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*/
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static inline int sctp_cacc_skip(struct sctp_transport *primary,
|
static inline int sctp_cacc_skip(struct sctp_transport *primary,
|
struct sctp_transport *transport,
|
struct sctp_transport *transport,
|
int count_of_newacks,
|
int count_of_newacks,
|
__u32 tsn)
|
__u32 tsn)
|
{
|
{
|
if (primary->cacc.changeover_active &&
|
if (primary->cacc.changeover_active &&
|
(sctp_cacc_skip_3_1(primary, transport, count_of_newacks)
|
(sctp_cacc_skip_3_1(primary, transport, count_of_newacks)
|
|| sctp_cacc_skip_3_2(primary, tsn)))
|
|| sctp_cacc_skip_3_2(primary, tsn)))
|
return 1;
|
return 1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Generate a new outqueue. */
|
/* Generate a new outqueue. */
|
struct sctp_outq *sctp_outq_new(struct sctp_association *asoc)
|
struct sctp_outq *sctp_outq_new(struct sctp_association *asoc)
|
{
|
{
|
struct sctp_outq *q;
|
struct sctp_outq *q;
|
|
|
q = t_new(struct sctp_outq, GFP_KERNEL);
|
q = t_new(struct sctp_outq, GFP_KERNEL);
|
if (q) {
|
if (q) {
|
sctp_outq_init(asoc, q);
|
sctp_outq_init(asoc, q);
|
q->malloced = 1;
|
q->malloced = 1;
|
}
|
}
|
return q;
|
return q;
|
}
|
}
|
|
|
/* Initialize an existing sctp_outq. This does the boring stuff.
|
/* Initialize an existing sctp_outq. This does the boring stuff.
|
* You still need to define handlers if you really want to DO
|
* You still need to define handlers if you really want to DO
|
* something with this structure...
|
* something with this structure...
|
*/
|
*/
|
void sctp_outq_init(struct sctp_association *asoc, struct sctp_outq *q)
|
void sctp_outq_init(struct sctp_association *asoc, struct sctp_outq *q)
|
{
|
{
|
q->asoc = asoc;
|
q->asoc = asoc;
|
skb_queue_head_init(&q->out);
|
skb_queue_head_init(&q->out);
|
skb_queue_head_init(&q->control);
|
skb_queue_head_init(&q->control);
|
INIT_LIST_HEAD(&q->retransmit);
|
INIT_LIST_HEAD(&q->retransmit);
|
INIT_LIST_HEAD(&q->sacked);
|
INIT_LIST_HEAD(&q->sacked);
|
|
|
q->init_output = NULL;
|
q->init_output = NULL;
|
q->config_output = NULL;
|
q->config_output = NULL;
|
q->append_output = NULL;
|
q->append_output = NULL;
|
q->build_output = NULL;
|
q->build_output = NULL;
|
q->force_output = NULL;
|
q->force_output = NULL;
|
|
|
q->outstanding_bytes = 0;
|
q->outstanding_bytes = 0;
|
q->empty = 1;
|
q->empty = 1;
|
q->cork = 0;
|
q->cork = 0;
|
|
|
q->malloced = 0;
|
q->malloced = 0;
|
q->out_qlen = 0;
|
q->out_qlen = 0;
|
}
|
}
|
|
|
/* Free the outqueue structure and any related pending chunks.
|
/* Free the outqueue structure and any related pending chunks.
|
*/
|
*/
|
void sctp_outq_teardown(struct sctp_outq *q)
|
void sctp_outq_teardown(struct sctp_outq *q)
|
{
|
{
|
struct sctp_transport *transport;
|
struct sctp_transport *transport;
|
struct list_head *lchunk, *pos, *temp;
|
struct list_head *lchunk, *pos, *temp;
|
struct sctp_chunk *chunk;
|
struct sctp_chunk *chunk;
|
|
|
/* Throw away unacknowledged chunks. */
|
/* Throw away unacknowledged chunks. */
|
list_for_each(pos, &q->asoc->peer.transport_addr_list) {
|
list_for_each(pos, &q->asoc->peer.transport_addr_list) {
|
transport = list_entry(pos, struct sctp_transport, transports);
|
transport = list_entry(pos, struct sctp_transport, transports);
|
while ((lchunk = sctp_list_dequeue(&transport->transmitted))) {
|
while ((lchunk = sctp_list_dequeue(&transport->transmitted))) {
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
/* Mark as part of a failed message. */
|
/* Mark as part of a failed message. */
|
sctp_datamsg_fail(chunk, q->error);
|
sctp_datamsg_fail(chunk, q->error);
|
sctp_chunk_free(chunk);
|
sctp_chunk_free(chunk);
|
}
|
}
|
}
|
}
|
|
|
/* Throw away chunks that have been gap ACKed. */
|
/* Throw away chunks that have been gap ACKed. */
|
list_for_each_safe(lchunk, temp, &q->sacked) {
|
list_for_each_safe(lchunk, temp, &q->sacked) {
|
list_del_init(lchunk);
|
list_del_init(lchunk);
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
sctp_datamsg_fail(chunk, q->error);
|
sctp_datamsg_fail(chunk, q->error);
|
sctp_chunk_free(chunk);
|
sctp_chunk_free(chunk);
|
}
|
}
|
|
|
/* Throw away any chunks in the retransmit queue. */
|
/* Throw away any chunks in the retransmit queue. */
|
list_for_each_safe(lchunk, temp, &q->retransmit) {
|
list_for_each_safe(lchunk, temp, &q->retransmit) {
|
list_del_init(lchunk);
|
list_del_init(lchunk);
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
sctp_datamsg_fail(chunk, q->error);
|
sctp_datamsg_fail(chunk, q->error);
|
sctp_chunk_free(chunk);
|
sctp_chunk_free(chunk);
|
}
|
}
|
|
|
/* Throw away any leftover data chunks. */
|
/* Throw away any leftover data chunks. */
|
while ((chunk = sctp_outq_dequeue_data(q))) {
|
while ((chunk = sctp_outq_dequeue_data(q))) {
|
|
|
/* Mark as send failure. */
|
/* Mark as send failure. */
|
sctp_datamsg_fail(chunk, q->error);
|
sctp_datamsg_fail(chunk, q->error);
|
sctp_chunk_free(chunk);
|
sctp_chunk_free(chunk);
|
}
|
}
|
|
|
q->error = 0;
|
q->error = 0;
|
|
|
/* Throw away any leftover control chunks. */
|
/* Throw away any leftover control chunks. */
|
while ((chunk = (struct sctp_chunk *) skb_dequeue(&q->control)))
|
while ((chunk = (struct sctp_chunk *) skb_dequeue(&q->control)))
|
sctp_chunk_free(chunk);
|
sctp_chunk_free(chunk);
|
}
|
}
|
|
|
/* Free the outqueue structure and any related pending chunks. */
|
/* Free the outqueue structure and any related pending chunks. */
|
void sctp_outq_free(struct sctp_outq *q)
|
void sctp_outq_free(struct sctp_outq *q)
|
{
|
{
|
/* Throw away leftover chunks. */
|
/* Throw away leftover chunks. */
|
sctp_outq_teardown(q);
|
sctp_outq_teardown(q);
|
|
|
/* If we were kmalloc()'d, free the memory. */
|
/* If we were kmalloc()'d, free the memory. */
|
if (q->malloced)
|
if (q->malloced)
|
kfree(q);
|
kfree(q);
|
}
|
}
|
|
|
/* Put a new chunk in an sctp_outq. */
|
/* Put a new chunk in an sctp_outq. */
|
int sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk)
|
int sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk)
|
{
|
{
|
int error = 0;
|
int error = 0;
|
|
|
SCTP_DEBUG_PRINTK("sctp_outq_tail(%p, %p[%s])\n",
|
SCTP_DEBUG_PRINTK("sctp_outq_tail(%p, %p[%s])\n",
|
q, chunk, chunk && chunk->chunk_hdr ?
|
q, chunk, chunk && chunk->chunk_hdr ?
|
sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type))
|
sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type))
|
: "Illegal Chunk");
|
: "Illegal Chunk");
|
|
|
/* If it is data, queue it up, otherwise, send it
|
/* If it is data, queue it up, otherwise, send it
|
* immediately.
|
* immediately.
|
*/
|
*/
|
if (SCTP_CID_DATA == chunk->chunk_hdr->type) {
|
if (SCTP_CID_DATA == chunk->chunk_hdr->type) {
|
/* Is it OK to queue data chunks? */
|
/* Is it OK to queue data chunks? */
|
/* From 9. Termination of Association
|
/* From 9. Termination of Association
|
*
|
*
|
* When either endpoint performs a shutdown, the
|
* When either endpoint performs a shutdown, the
|
* association on each peer will stop accepting new
|
* association on each peer will stop accepting new
|
* data from its user and only deliver data in queue
|
* data from its user and only deliver data in queue
|
* at the time of sending or receiving the SHUTDOWN
|
* at the time of sending or receiving the SHUTDOWN
|
* chunk.
|
* chunk.
|
*/
|
*/
|
switch (q->asoc->state) {
|
switch (q->asoc->state) {
|
case SCTP_STATE_EMPTY:
|
case SCTP_STATE_EMPTY:
|
case SCTP_STATE_CLOSED:
|
case SCTP_STATE_CLOSED:
|
case SCTP_STATE_SHUTDOWN_PENDING:
|
case SCTP_STATE_SHUTDOWN_PENDING:
|
case SCTP_STATE_SHUTDOWN_SENT:
|
case SCTP_STATE_SHUTDOWN_SENT:
|
case SCTP_STATE_SHUTDOWN_RECEIVED:
|
case SCTP_STATE_SHUTDOWN_RECEIVED:
|
case SCTP_STATE_SHUTDOWN_ACK_SENT:
|
case SCTP_STATE_SHUTDOWN_ACK_SENT:
|
/* Cannot send after transport endpoint shutdown */
|
/* Cannot send after transport endpoint shutdown */
|
error = -ESHUTDOWN;
|
error = -ESHUTDOWN;
|
break;
|
break;
|
|
|
default:
|
default:
|
SCTP_DEBUG_PRINTK("outqueueing (%p, %p[%s])\n",
|
SCTP_DEBUG_PRINTK("outqueueing (%p, %p[%s])\n",
|
q, chunk, chunk && chunk->chunk_hdr ?
|
q, chunk, chunk && chunk->chunk_hdr ?
|
sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type))
|
sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type))
|
: "Illegal Chunk");
|
: "Illegal Chunk");
|
|
|
sctp_outq_tail_data(q, chunk);
|
sctp_outq_tail_data(q, chunk);
|
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
|
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
|
SCTP_INC_STATS(SctpOutUnorderChunks);
|
SCTP_INC_STATS(SctpOutUnorderChunks);
|
else
|
else
|
SCTP_INC_STATS(SctpOutOrderChunks);
|
SCTP_INC_STATS(SctpOutOrderChunks);
|
q->empty = 0;
|
q->empty = 0;
|
break;
|
break;
|
};
|
};
|
} else {
|
} else {
|
__skb_queue_tail(&q->control, (struct sk_buff *) chunk);
|
__skb_queue_tail(&q->control, (struct sk_buff *) chunk);
|
SCTP_INC_STATS(SctpOutCtrlChunks);
|
SCTP_INC_STATS(SctpOutCtrlChunks);
|
}
|
}
|
|
|
if (error < 0)
|
if (error < 0)
|
return error;
|
return error;
|
|
|
if (!q->cork)
|
if (!q->cork)
|
error = sctp_outq_flush(q, 0);
|
error = sctp_outq_flush(q, 0);
|
|
|
return error;
|
return error;
|
}
|
}
|
|
|
/* Insert a chunk into the retransmit queue. Chunks on the retransmit
|
/* Insert a chunk into the retransmit queue. Chunks on the retransmit
|
* queue are kept in order, based on the TSNs.
|
* queue are kept in order, based on the TSNs.
|
*/
|
*/
|
void sctp_retransmit_insert(struct list_head *tlchunk, struct sctp_outq *q)
|
void sctp_retransmit_insert(struct list_head *tlchunk, struct sctp_outq *q)
|
{
|
{
|
struct list_head *rlchunk;
|
struct list_head *rlchunk;
|
struct sctp_chunk *tchunk, *rchunk;
|
struct sctp_chunk *tchunk, *rchunk;
|
__u32 ttsn, rtsn;
|
__u32 ttsn, rtsn;
|
int done = 0;
|
int done = 0;
|
|
|
tchunk = list_entry(tlchunk, struct sctp_chunk, transmitted_list);
|
tchunk = list_entry(tlchunk, struct sctp_chunk, transmitted_list);
|
ttsn = ntohl(tchunk->subh.data_hdr->tsn);
|
ttsn = ntohl(tchunk->subh.data_hdr->tsn);
|
|
|
list_for_each(rlchunk, &q->retransmit) {
|
list_for_each(rlchunk, &q->retransmit) {
|
rchunk = list_entry(rlchunk, struct sctp_chunk,
|
rchunk = list_entry(rlchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
rtsn = ntohl(rchunk->subh.data_hdr->tsn);
|
rtsn = ntohl(rchunk->subh.data_hdr->tsn);
|
if (TSN_lt(ttsn, rtsn)) {
|
if (TSN_lt(ttsn, rtsn)) {
|
list_add(tlchunk, rlchunk->prev);
|
list_add(tlchunk, rlchunk->prev);
|
done = 1;
|
done = 1;
|
break;
|
break;
|
}
|
}
|
}
|
}
|
if (!done) {
|
if (!done) {
|
list_add_tail(tlchunk, &q->retransmit);
|
list_add_tail(tlchunk, &q->retransmit);
|
}
|
}
|
}
|
}
|
|
|
/* Mark all the eligible packets on a transport for retransmission. */
|
/* Mark all the eligible packets on a transport for retransmission. */
|
void sctp_retransmit_mark(struct sctp_outq *q,
|
void sctp_retransmit_mark(struct sctp_outq *q,
|
struct sctp_transport *transport,
|
struct sctp_transport *transport,
|
__u8 fast_retransmit)
|
__u8 fast_retransmit)
|
{
|
{
|
struct list_head *lchunk, *ltemp;
|
struct list_head *lchunk, *ltemp;
|
struct sctp_chunk *chunk;
|
struct sctp_chunk *chunk;
|
|
|
/* Walk through the specified transmitted queue. */
|
/* Walk through the specified transmitted queue. */
|
list_for_each_safe(lchunk, ltemp, &transport->transmitted) {
|
list_for_each_safe(lchunk, ltemp, &transport->transmitted) {
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
|
|
/* If we are doing retransmission due to a fast retransmit,
|
/* If we are doing retransmission due to a fast retransmit,
|
* only the chunk's that are marked for fast retransmit
|
* only the chunk's that are marked for fast retransmit
|
* should be added to the retransmit queue. If we are doing
|
* should be added to the retransmit queue. If we are doing
|
* retransmission due to a timeout or pmtu discovery, only the
|
* retransmission due to a timeout or pmtu discovery, only the
|
* chunks that are not yet acked should be added to the
|
* chunks that are not yet acked should be added to the
|
* retransmit queue.
|
* retransmit queue.
|
*/
|
*/
|
if ((fast_retransmit && chunk->fast_retransmit) ||
|
if ((fast_retransmit && chunk->fast_retransmit) ||
|
(!fast_retransmit && !chunk->tsn_gap_acked)) {
|
(!fast_retransmit && !chunk->tsn_gap_acked)) {
|
/* RFC 2960 6.2.1 Processing a Received SACK
|
/* RFC 2960 6.2.1 Processing a Received SACK
|
*
|
*
|
* C) Any time a DATA chunk is marked for
|
* C) Any time a DATA chunk is marked for
|
* retransmission (via either T3-rtx timer expiration
|
* retransmission (via either T3-rtx timer expiration
|
* (Section 6.3.3) or via fast retransmit
|
* (Section 6.3.3) or via fast retransmit
|
* (Section 7.2.4)), add the data size of those
|
* (Section 7.2.4)), add the data size of those
|
* chunks to the rwnd.
|
* chunks to the rwnd.
|
*/
|
*/
|
q->asoc->peer.rwnd += sctp_data_size(chunk);
|
q->asoc->peer.rwnd += sctp_data_size(chunk);
|
q->outstanding_bytes -= sctp_data_size(chunk);
|
q->outstanding_bytes -= sctp_data_size(chunk);
|
transport->flight_size -= sctp_data_size(chunk);
|
transport->flight_size -= sctp_data_size(chunk);
|
|
|
/* sctpimpguide-05 Section 2.8.2
|
/* sctpimpguide-05 Section 2.8.2
|
* M5) If a T3-rtx timer expires, the
|
* M5) If a T3-rtx timer expires, the
|
* 'TSN.Missing.Report' of all affected TSNs is set
|
* 'TSN.Missing.Report' of all affected TSNs is set
|
* to 0.
|
* to 0.
|
*/
|
*/
|
chunk->tsn_missing_report = 0;
|
chunk->tsn_missing_report = 0;
|
|
|
/* If a chunk that is being used for RTT measurement
|
/* If a chunk that is being used for RTT measurement
|
* has to be retransmitted, we cannot use this chunk
|
* has to be retransmitted, we cannot use this chunk
|
* anymore for RTT measurements. Reset rto_pending so
|
* anymore for RTT measurements. Reset rto_pending so
|
* that a new RTT measurement is started when a new
|
* that a new RTT measurement is started when a new
|
* data chunk is sent.
|
* data chunk is sent.
|
*/
|
*/
|
if (chunk->rtt_in_progress) {
|
if (chunk->rtt_in_progress) {
|
chunk->rtt_in_progress = 0;
|
chunk->rtt_in_progress = 0;
|
transport->rto_pending = 0;
|
transport->rto_pending = 0;
|
}
|
}
|
|
|
/* Move the chunk to the retransmit queue. The chunks
|
/* Move the chunk to the retransmit queue. The chunks
|
* on the retransmit queue is always kept in order.
|
* on the retransmit queue is always kept in order.
|
*/
|
*/
|
list_del_init(lchunk);
|
list_del_init(lchunk);
|
sctp_retransmit_insert(lchunk, q);
|
sctp_retransmit_insert(lchunk, q);
|
}
|
}
|
}
|
}
|
|
|
SCTP_DEBUG_PRINTK("%s: transport: %p, fast_retransmit: %d, "
|
SCTP_DEBUG_PRINTK("%s: transport: %p, fast_retransmit: %d, "
|
"cwnd: %d, ssthresh: %d, flight_size: %d, "
|
"cwnd: %d, ssthresh: %d, flight_size: %d, "
|
"pba: %d\n", __FUNCTION__,
|
"pba: %d\n", __FUNCTION__,
|
transport, fast_retransmit,
|
transport, fast_retransmit,
|
transport->cwnd, transport->ssthresh,
|
transport->cwnd, transport->ssthresh,
|
transport->flight_size,
|
transport->flight_size,
|
transport->partial_bytes_acked);
|
transport->partial_bytes_acked);
|
|
|
}
|
}
|
|
|
/* Mark all the eligible packets on a transport for retransmission and force
|
/* Mark all the eligible packets on a transport for retransmission and force
|
* one packet out.
|
* one packet out.
|
*/
|
*/
|
void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
|
void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
|
sctp_retransmit_reason_t reason)
|
sctp_retransmit_reason_t reason)
|
{
|
{
|
int error = 0;
|
int error = 0;
|
__u8 fast_retransmit = 0;
|
__u8 fast_retransmit = 0;
|
|
|
switch(reason) {
|
switch(reason) {
|
case SCTP_RTXR_T3_RTX:
|
case SCTP_RTXR_T3_RTX:
|
sctp_transport_lower_cwnd(transport, SCTP_LOWER_CWND_T3_RTX);
|
sctp_transport_lower_cwnd(transport, SCTP_LOWER_CWND_T3_RTX);
|
/* Update the retran path if the T3-rtx timer has expired for
|
/* Update the retran path if the T3-rtx timer has expired for
|
* the current retran path.
|
* the current retran path.
|
*/
|
*/
|
if (transport == transport->asoc->peer.retran_path)
|
if (transport == transport->asoc->peer.retran_path)
|
sctp_assoc_update_retran_path(transport->asoc);
|
sctp_assoc_update_retran_path(transport->asoc);
|
break;
|
break;
|
case SCTP_RTXR_FAST_RTX:
|
case SCTP_RTXR_FAST_RTX:
|
sctp_transport_lower_cwnd(transport, SCTP_LOWER_CWND_FAST_RTX);
|
sctp_transport_lower_cwnd(transport, SCTP_LOWER_CWND_FAST_RTX);
|
fast_retransmit = 1;
|
fast_retransmit = 1;
|
break;
|
break;
|
case SCTP_RTXR_PMTUD:
|
case SCTP_RTXR_PMTUD:
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
|
|
sctp_retransmit_mark(q, transport, fast_retransmit);
|
sctp_retransmit_mark(q, transport, fast_retransmit);
|
|
|
error = sctp_outq_flush(q, /* rtx_timeout */ 1);
|
error = sctp_outq_flush(q, /* rtx_timeout */ 1);
|
|
|
if (error)
|
if (error)
|
q->asoc->base.sk->sk_err = -error;
|
q->asoc->base.sk->sk_err = -error;
|
}
|
}
|
|
|
/*
|
/*
|
* Transmit DATA chunks on the retransmit queue. Upon return from
|
* Transmit DATA chunks on the retransmit queue. Upon return from
|
* sctp_outq_flush_rtx() the packet 'pkt' may contain chunks which
|
* sctp_outq_flush_rtx() the packet 'pkt' may contain chunks which
|
* need to be transmitted by the caller.
|
* need to be transmitted by the caller.
|
* We assume that pkt->transport has already been set.
|
* We assume that pkt->transport has already been set.
|
*
|
*
|
* The return value is a normal kernel error return value.
|
* The return value is a normal kernel error return value.
|
*/
|
*/
|
static int sctp_outq_flush_rtx(struct sctp_outq *q, struct sctp_packet *pkt,
|
static int sctp_outq_flush_rtx(struct sctp_outq *q, struct sctp_packet *pkt,
|
int rtx_timeout, int *start_timer)
|
int rtx_timeout, int *start_timer)
|
{
|
{
|
struct list_head *lqueue;
|
struct list_head *lqueue;
|
struct list_head *lchunk;
|
struct list_head *lchunk;
|
struct sctp_transport *transport = pkt->transport;
|
struct sctp_transport *transport = pkt->transport;
|
sctp_xmit_t status;
|
sctp_xmit_t status;
|
struct sctp_chunk *chunk;
|
struct sctp_chunk *chunk;
|
struct sctp_association *asoc;
|
struct sctp_association *asoc;
|
int error = 0;
|
int error = 0;
|
|
|
asoc = q->asoc;
|
asoc = q->asoc;
|
lqueue = &q->retransmit;
|
lqueue = &q->retransmit;
|
|
|
/* RFC 2960 6.3.3 Handle T3-rtx Expiration
|
/* RFC 2960 6.3.3 Handle T3-rtx Expiration
|
*
|
*
|
* E3) Determine how many of the earliest (i.e., lowest TSN)
|
* E3) Determine how many of the earliest (i.e., lowest TSN)
|
* outstanding DATA chunks for the address for which the
|
* outstanding DATA chunks for the address for which the
|
* T3-rtx has expired will fit into a single packet, subject
|
* T3-rtx has expired will fit into a single packet, subject
|
* to the MTU constraint for the path corresponding to the
|
* to the MTU constraint for the path corresponding to the
|
* destination transport address to which the retransmission
|
* destination transport address to which the retransmission
|
* is being sent (this may be different from the address for
|
* is being sent (this may be different from the address for
|
* which the timer expires [see Section 6.4]). Call this value
|
* which the timer expires [see Section 6.4]). Call this value
|
* K. Bundle and retransmit those K DATA chunks in a single
|
* K. Bundle and retransmit those K DATA chunks in a single
|
* packet to the destination endpoint.
|
* packet to the destination endpoint.
|
*
|
*
|
* [Just to be painfully clear, if we are retransmitting
|
* [Just to be painfully clear, if we are retransmitting
|
* because a timeout just happened, we should send only ONE
|
* because a timeout just happened, we should send only ONE
|
* packet of retransmitted data.]
|
* packet of retransmitted data.]
|
*/
|
*/
|
lchunk = sctp_list_dequeue(lqueue);
|
lchunk = sctp_list_dequeue(lqueue);
|
|
|
while (lchunk) {
|
while (lchunk) {
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
|
|
/* Make sure that Gap Acked TSNs are not retransmitted. A
|
/* Make sure that Gap Acked TSNs are not retransmitted. A
|
* simple approach is just to move such TSNs out of the
|
* simple approach is just to move such TSNs out of the
|
* way and into a 'transmitted' queue and skip to the
|
* way and into a 'transmitted' queue and skip to the
|
* next chunk.
|
* next chunk.
|
*/
|
*/
|
if (chunk->tsn_gap_acked) {
|
if (chunk->tsn_gap_acked) {
|
list_add_tail(lchunk, &transport->transmitted);
|
list_add_tail(lchunk, &transport->transmitted);
|
lchunk = sctp_list_dequeue(lqueue);
|
lchunk = sctp_list_dequeue(lqueue);
|
continue;
|
continue;
|
}
|
}
|
|
|
/* Attempt to append this chunk to the packet. */
|
/* Attempt to append this chunk to the packet. */
|
status = (*q->append_output)(pkt, chunk);
|
status = (*q->append_output)(pkt, chunk);
|
|
|
switch (status) {
|
switch (status) {
|
case SCTP_XMIT_PMTU_FULL:
|
case SCTP_XMIT_PMTU_FULL:
|
/* Send this packet. */
|
/* Send this packet. */
|
if ((error = (*q->force_output)(pkt)) == 0)
|
if ((error = (*q->force_output)(pkt)) == 0)
|
*start_timer = 1;
|
*start_timer = 1;
|
|
|
/* If we are retransmitting, we should only
|
/* If we are retransmitting, we should only
|
* send a single packet.
|
* send a single packet.
|
*/
|
*/
|
if (rtx_timeout) {
|
if (rtx_timeout) {
|
list_add(lchunk, lqueue);
|
list_add(lchunk, lqueue);
|
lchunk = NULL;
|
lchunk = NULL;
|
}
|
}
|
|
|
/* Bundle lchunk in the next round. */
|
/* Bundle lchunk in the next round. */
|
break;
|
break;
|
|
|
case SCTP_XMIT_RWND_FULL:
|
case SCTP_XMIT_RWND_FULL:
|
/* Send this packet. */
|
/* Send this packet. */
|
if ((error = (*q->force_output)(pkt)) == 0)
|
if ((error = (*q->force_output)(pkt)) == 0)
|
*start_timer = 1;
|
*start_timer = 1;
|
|
|
/* Stop sending DATA as there is no more room
|
/* Stop sending DATA as there is no more room
|
* at the receiver.
|
* at the receiver.
|
*/
|
*/
|
list_add(lchunk, lqueue);
|
list_add(lchunk, lqueue);
|
lchunk = NULL;
|
lchunk = NULL;
|
break;
|
break;
|
|
|
default:
|
default:
|
/* The append was successful, so add this chunk to
|
/* The append was successful, so add this chunk to
|
* the transmitted list.
|
* the transmitted list.
|
*/
|
*/
|
list_add_tail(lchunk, &transport->transmitted);
|
list_add_tail(lchunk, &transport->transmitted);
|
*start_timer = 1;
|
*start_timer = 1;
|
q->empty = 0;
|
q->empty = 0;
|
|
|
/* Retrieve a new chunk to bundle. */
|
/* Retrieve a new chunk to bundle. */
|
lchunk = sctp_list_dequeue(lqueue);
|
lchunk = sctp_list_dequeue(lqueue);
|
break;
|
break;
|
};
|
};
|
}
|
}
|
|
|
return error;
|
return error;
|
}
|
}
|
|
|
/* Cork the outqueue so queued chunks are really queued. */
|
/* Cork the outqueue so queued chunks are really queued. */
|
int sctp_outq_uncork(struct sctp_outq *q)
|
int sctp_outq_uncork(struct sctp_outq *q)
|
{
|
{
|
int error = 0;
|
int error = 0;
|
if (q->cork) {
|
if (q->cork) {
|
q->cork = 0;
|
q->cork = 0;
|
error = sctp_outq_flush(q, 0);
|
error = sctp_outq_flush(q, 0);
|
}
|
}
|
return error;
|
return error;
|
}
|
}
|
|
|
/*
|
/*
|
* Try to flush an outqueue.
|
* Try to flush an outqueue.
|
*
|
*
|
* Description: Send everything in q which we legally can, subject to
|
* Description: Send everything in q which we legally can, subject to
|
* congestion limitations.
|
* congestion limitations.
|
* * Note: This function can be called from multiple contexts so appropriate
|
* * Note: This function can be called from multiple contexts so appropriate
|
* locking concerns must be made. Today we use the sock lock to protect
|
* locking concerns must be made. Today we use the sock lock to protect
|
* this function.
|
* this function.
|
*/
|
*/
|
int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
|
int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
|
{
|
{
|
struct sctp_packet *packet;
|
struct sctp_packet *packet;
|
struct sctp_packet singleton;
|
struct sctp_packet singleton;
|
struct sctp_association *asoc = q->asoc;
|
struct sctp_association *asoc = q->asoc;
|
int ecn_capable = asoc->peer.ecn_capable;
|
int ecn_capable = asoc->peer.ecn_capable;
|
__u16 sport = asoc->base.bind_addr.port;
|
__u16 sport = asoc->base.bind_addr.port;
|
__u16 dport = asoc->peer.port;
|
__u16 dport = asoc->peer.port;
|
__u32 vtag = asoc->peer.i.init_tag;
|
__u32 vtag = asoc->peer.i.init_tag;
|
/* This is the ECNE handler for singleton packets. */
|
/* This is the ECNE handler for singleton packets. */
|
sctp_packet_phandler_t *s_ecne_handler = NULL;
|
sctp_packet_phandler_t *s_ecne_handler = NULL;
|
sctp_packet_phandler_t *ecne_handler = NULL;
|
sctp_packet_phandler_t *ecne_handler = NULL;
|
struct sk_buff_head *queue;
|
struct sk_buff_head *queue;
|
struct sctp_transport *transport = NULL;
|
struct sctp_transport *transport = NULL;
|
struct sctp_transport *new_transport;
|
struct sctp_transport *new_transport;
|
struct sctp_chunk *chunk;
|
struct sctp_chunk *chunk;
|
sctp_xmit_t status;
|
sctp_xmit_t status;
|
int error = 0;
|
int error = 0;
|
int start_timer = 0;
|
int start_timer = 0;
|
|
|
/* These transports have chunks to send. */
|
/* These transports have chunks to send. */
|
struct list_head transport_list;
|
struct list_head transport_list;
|
struct list_head *ltransport;
|
struct list_head *ltransport;
|
|
|
INIT_LIST_HEAD(&transport_list);
|
INIT_LIST_HEAD(&transport_list);
|
packet = NULL;
|
packet = NULL;
|
|
|
/*
|
/*
|
* 6.10 Bundling
|
* 6.10 Bundling
|
* ...
|
* ...
|
* When bundling control chunks with DATA chunks, an
|
* When bundling control chunks with DATA chunks, an
|
* endpoint MUST place control chunks first in the outbound
|
* endpoint MUST place control chunks first in the outbound
|
* SCTP packet. The transmitter MUST transmit DATA chunks
|
* SCTP packet. The transmitter MUST transmit DATA chunks
|
* within a SCTP packet in increasing order of TSN.
|
* within a SCTP packet in increasing order of TSN.
|
* ...
|
* ...
|
*/
|
*/
|
if (ecn_capable) {
|
if (ecn_capable) {
|
s_ecne_handler = &sctp_get_no_prepend;
|
s_ecne_handler = &sctp_get_no_prepend;
|
ecne_handler = &sctp_get_ecne_prepend;
|
ecne_handler = &sctp_get_ecne_prepend;
|
}
|
}
|
|
|
queue = &q->control;
|
queue = &q->control;
|
while ((chunk = (struct sctp_chunk *)skb_dequeue(queue))) {
|
while ((chunk = (struct sctp_chunk *)skb_dequeue(queue))) {
|
/* Pick the right transport to use. */
|
/* Pick the right transport to use. */
|
new_transport = chunk->transport;
|
new_transport = chunk->transport;
|
|
|
if (!new_transport) {
|
if (!new_transport) {
|
new_transport = asoc->peer.active_path;
|
new_transport = asoc->peer.active_path;
|
} else if (!new_transport->active) {
|
} else if (!new_transport->active) {
|
/* If the chunk is Heartbeat, send it to
|
/* If the chunk is Heartbeat, send it to
|
* chunk->transport, even it's inactive.
|
* chunk->transport, even it's inactive.
|
*/
|
*/
|
if (chunk->chunk_hdr->type != SCTP_CID_HEARTBEAT)
|
if (chunk->chunk_hdr->type != SCTP_CID_HEARTBEAT)
|
new_transport = asoc->peer.active_path;
|
new_transport = asoc->peer.active_path;
|
}
|
}
|
|
|
/* Are we switching transports?
|
/* Are we switching transports?
|
* Take care of transport locks.
|
* Take care of transport locks.
|
*/
|
*/
|
if (new_transport != transport) {
|
if (new_transport != transport) {
|
transport = new_transport;
|
transport = new_transport;
|
if (list_empty(&transport->send_ready)) {
|
if (list_empty(&transport->send_ready)) {
|
list_add_tail(&transport->send_ready,
|
list_add_tail(&transport->send_ready,
|
&transport_list);
|
&transport_list);
|
}
|
}
|
packet = &transport->packet;
|
packet = &transport->packet;
|
(*q->config_output)(packet, vtag,
|
(*q->config_output)(packet, vtag,
|
ecn_capable, ecne_handler);
|
ecn_capable, ecne_handler);
|
}
|
}
|
|
|
switch (chunk->chunk_hdr->type) {
|
switch (chunk->chunk_hdr->type) {
|
/*
|
/*
|
* 6.10 Bundling
|
* 6.10 Bundling
|
* ...
|
* ...
|
* An endpoint MUST NOT bundle INIT, INIT ACK or SHUTDOWN
|
* An endpoint MUST NOT bundle INIT, INIT ACK or SHUTDOWN
|
* COMPLETE with any other chunks. [Send them immediately.]
|
* COMPLETE with any other chunks. [Send them immediately.]
|
*/
|
*/
|
case SCTP_CID_INIT:
|
case SCTP_CID_INIT:
|
case SCTP_CID_INIT_ACK:
|
case SCTP_CID_INIT_ACK:
|
case SCTP_CID_SHUTDOWN_COMPLETE:
|
case SCTP_CID_SHUTDOWN_COMPLETE:
|
(*q->init_output)(&singleton, transport, sport, dport);
|
(*q->init_output)(&singleton, transport, sport, dport);
|
(*q->config_output)(&singleton, vtag, ecn_capable,
|
(*q->config_output)(&singleton, vtag, ecn_capable,
|
s_ecne_handler);
|
s_ecne_handler);
|
(void) (*q->build_output)(&singleton, chunk);
|
(void) (*q->build_output)(&singleton, chunk);
|
error = (*q->force_output)(&singleton);
|
error = (*q->force_output)(&singleton);
|
if (error < 0)
|
if (error < 0)
|
return error;
|
return error;
|
break;
|
break;
|
|
|
case SCTP_CID_ABORT:
|
case SCTP_CID_ABORT:
|
case SCTP_CID_SACK:
|
case SCTP_CID_SACK:
|
case SCTP_CID_HEARTBEAT:
|
case SCTP_CID_HEARTBEAT:
|
case SCTP_CID_HEARTBEAT_ACK:
|
case SCTP_CID_HEARTBEAT_ACK:
|
case SCTP_CID_SHUTDOWN:
|
case SCTP_CID_SHUTDOWN:
|
case SCTP_CID_SHUTDOWN_ACK:
|
case SCTP_CID_SHUTDOWN_ACK:
|
case SCTP_CID_ERROR:
|
case SCTP_CID_ERROR:
|
case SCTP_CID_COOKIE_ECHO:
|
case SCTP_CID_COOKIE_ECHO:
|
case SCTP_CID_COOKIE_ACK:
|
case SCTP_CID_COOKIE_ACK:
|
case SCTP_CID_ECN_ECNE:
|
case SCTP_CID_ECN_ECNE:
|
case SCTP_CID_ECN_CWR:
|
case SCTP_CID_ECN_CWR:
|
(void) (*q->build_output)(packet, chunk);
|
(void) (*q->build_output)(packet, chunk);
|
break;
|
break;
|
|
|
case SCTP_CID_ASCONF:
|
case SCTP_CID_ASCONF:
|
case SCTP_CID_ASCONF_ACK:
|
case SCTP_CID_ASCONF_ACK:
|
(void) (*q->build_output)(packet, chunk);
|
(void) (*q->build_output)(packet, chunk);
|
break;
|
break;
|
|
|
default:
|
default:
|
/* We built a chunk with an illegal type! */
|
/* We built a chunk with an illegal type! */
|
BUG();
|
BUG();
|
};
|
};
|
}
|
}
|
|
|
/* Is it OK to send data chunks? */
|
/* Is it OK to send data chunks? */
|
switch (asoc->state) {
|
switch (asoc->state) {
|
case SCTP_STATE_COOKIE_ECHOED:
|
case SCTP_STATE_COOKIE_ECHOED:
|
/* Only allow bundling when this packet has a COOKIE-ECHO
|
/* Only allow bundling when this packet has a COOKIE-ECHO
|
* chunk.
|
* chunk.
|
*/
|
*/
|
if (!packet || !packet->has_cookie_echo)
|
if (!packet || !packet->has_cookie_echo)
|
break;
|
break;
|
|
|
/* fallthru */
|
/* fallthru */
|
case SCTP_STATE_ESTABLISHED:
|
case SCTP_STATE_ESTABLISHED:
|
case SCTP_STATE_SHUTDOWN_PENDING:
|
case SCTP_STATE_SHUTDOWN_PENDING:
|
case SCTP_STATE_SHUTDOWN_RECEIVED:
|
case SCTP_STATE_SHUTDOWN_RECEIVED:
|
/*
|
/*
|
* RFC 2960 6.1 Transmission of DATA Chunks
|
* RFC 2960 6.1 Transmission of DATA Chunks
|
*
|
*
|
* C) When the time comes for the sender to transmit,
|
* C) When the time comes for the sender to transmit,
|
* before sending new DATA chunks, the sender MUST
|
* before sending new DATA chunks, the sender MUST
|
* first transmit any outstanding DATA chunks which
|
* first transmit any outstanding DATA chunks which
|
* are marked for retransmission (limited by the
|
* are marked for retransmission (limited by the
|
* current cwnd).
|
* current cwnd).
|
*/
|
*/
|
if (!list_empty(&q->retransmit)) {
|
if (!list_empty(&q->retransmit)) {
|
if (transport == asoc->peer.retran_path)
|
if (transport == asoc->peer.retran_path)
|
goto retran;
|
goto retran;
|
|
|
/* Switch transports & prepare the packet. */
|
/* Switch transports & prepare the packet. */
|
|
|
transport = asoc->peer.retran_path;
|
transport = asoc->peer.retran_path;
|
|
|
if (list_empty(&transport->send_ready)) {
|
if (list_empty(&transport->send_ready)) {
|
list_add_tail(&transport->send_ready,
|
list_add_tail(&transport->send_ready,
|
&transport_list);
|
&transport_list);
|
}
|
}
|
|
|
packet = &transport->packet;
|
packet = &transport->packet;
|
(*q->config_output)(packet, vtag,
|
(*q->config_output)(packet, vtag,
|
ecn_capable, ecne_handler);
|
ecn_capable, ecne_handler);
|
retran:
|
retran:
|
error = sctp_outq_flush_rtx(q, packet,
|
error = sctp_outq_flush_rtx(q, packet,
|
rtx_timeout, &start_timer);
|
rtx_timeout, &start_timer);
|
|
|
if (start_timer)
|
if (start_timer)
|
sctp_transport_reset_timers(transport);
|
sctp_transport_reset_timers(transport);
|
|
|
/* This can happen on COOKIE-ECHO resend. Only
|
/* This can happen on COOKIE-ECHO resend. Only
|
* one chunk can get bundled with a COOKIE-ECHO.
|
* one chunk can get bundled with a COOKIE-ECHO.
|
*/
|
*/
|
if (packet->has_cookie_echo)
|
if (packet->has_cookie_echo)
|
goto sctp_flush_out;
|
goto sctp_flush_out;
|
|
|
/* Don't send new data if there is still data
|
/* Don't send new data if there is still data
|
* waiting to retransmit.
|
* waiting to retransmit.
|
*/
|
*/
|
if (!list_empty(&q->retransmit))
|
if (!list_empty(&q->retransmit))
|
goto sctp_flush_out;
|
goto sctp_flush_out;
|
}
|
}
|
|
|
/* Finally, transmit new packets. */
|
/* Finally, transmit new packets. */
|
start_timer = 0;
|
start_timer = 0;
|
queue = &q->out;
|
queue = &q->out;
|
|
|
while ((chunk = sctp_outq_dequeue_data(q))) {
|
while ((chunk = sctp_outq_dequeue_data(q))) {
|
/* RFC 2960 6.5 Every DATA chunk MUST carry a valid
|
/* RFC 2960 6.5 Every DATA chunk MUST carry a valid
|
* stream identifier.
|
* stream identifier.
|
*/
|
*/
|
if (chunk->sinfo.sinfo_stream >=
|
if (chunk->sinfo.sinfo_stream >=
|
asoc->c.sinit_num_ostreams) {
|
asoc->c.sinit_num_ostreams) {
|
|
|
/* Mark as s failed send. */
|
/* Mark as s failed send. */
|
sctp_datamsg_fail(chunk, SCTP_ERROR_INV_STRM);
|
sctp_datamsg_fail(chunk, SCTP_ERROR_INV_STRM);
|
sctp_chunk_free(chunk);
|
sctp_chunk_free(chunk);
|
continue;
|
continue;
|
}
|
}
|
|
|
/* Has this chunk expired? */
|
/* Has this chunk expired? */
|
if (sctp_datamsg_expires(chunk)) {
|
if (sctp_datamsg_expires(chunk)) {
|
sctp_datamsg_fail(chunk, 0);
|
sctp_datamsg_fail(chunk, 0);
|
sctp_chunk_free(chunk);
|
sctp_chunk_free(chunk);
|
continue;
|
continue;
|
}
|
}
|
|
|
/* If there is a specified transport, use it.
|
/* If there is a specified transport, use it.
|
* Otherwise, we want to use the active path.
|
* Otherwise, we want to use the active path.
|
*/
|
*/
|
new_transport = chunk->transport;
|
new_transport = chunk->transport;
|
if (!new_transport || !new_transport->active)
|
if (!new_transport || !new_transport->active)
|
new_transport = asoc->peer.active_path;
|
new_transport = asoc->peer.active_path;
|
|
|
/* Change packets if necessary. */
|
/* Change packets if necessary. */
|
if (new_transport != transport) {
|
if (new_transport != transport) {
|
transport = new_transport;
|
transport = new_transport;
|
|
|
/* Schedule to have this transport's
|
/* Schedule to have this transport's
|
* packet flushed.
|
* packet flushed.
|
*/
|
*/
|
if (list_empty(&transport->send_ready)) {
|
if (list_empty(&transport->send_ready)) {
|
list_add_tail(&transport->send_ready,
|
list_add_tail(&transport->send_ready,
|
&transport_list);
|
&transport_list);
|
}
|
}
|
|
|
packet = &transport->packet;
|
packet = &transport->packet;
|
(*q->config_output)(packet, vtag,
|
(*q->config_output)(packet, vtag,
|
ecn_capable, ecne_handler);
|
ecn_capable, ecne_handler);
|
}
|
}
|
|
|
SCTP_DEBUG_PRINTK("sctp_transmit_packet(%p, %p[%s]), ",
|
SCTP_DEBUG_PRINTK("sctp_transmit_packet(%p, %p[%s]), ",
|
q, chunk,
|
q, chunk,
|
chunk && chunk->chunk_hdr ?
|
chunk && chunk->chunk_hdr ?
|
sctp_cname(SCTP_ST_CHUNK(
|
sctp_cname(SCTP_ST_CHUNK(
|
chunk->chunk_hdr->type))
|
chunk->chunk_hdr->type))
|
: "Illegal Chunk");
|
: "Illegal Chunk");
|
|
|
SCTP_DEBUG_PRINTK("TX TSN 0x%x skb->head "
|
SCTP_DEBUG_PRINTK("TX TSN 0x%x skb->head "
|
"%p skb->users %d.\n",
|
"%p skb->users %d.\n",
|
ntohl(chunk->subh.data_hdr->tsn),
|
ntohl(chunk->subh.data_hdr->tsn),
|
chunk->skb ?chunk->skb->head : 0,
|
chunk->skb ?chunk->skb->head : 0,
|
chunk->skb ?
|
chunk->skb ?
|
atomic_read(&chunk->skb->users) : -1);
|
atomic_read(&chunk->skb->users) : -1);
|
|
|
/* Add the chunk to the packet. */
|
/* Add the chunk to the packet. */
|
status = (*q->build_output)(packet, chunk);
|
status = (*q->build_output)(packet, chunk);
|
|
|
switch (status) {
|
switch (status) {
|
case SCTP_XMIT_PMTU_FULL:
|
case SCTP_XMIT_PMTU_FULL:
|
case SCTP_XMIT_RWND_FULL:
|
case SCTP_XMIT_RWND_FULL:
|
case SCTP_XMIT_NAGLE_DELAY:
|
case SCTP_XMIT_NAGLE_DELAY:
|
/* We could not append this chunk, so put
|
/* We could not append this chunk, so put
|
* the chunk back on the output queue.
|
* the chunk back on the output queue.
|
*/
|
*/
|
SCTP_DEBUG_PRINTK("sctp_outq_flush: could "
|
SCTP_DEBUG_PRINTK("sctp_outq_flush: could "
|
"not transmit TSN: 0x%x, status: %d\n",
|
"not transmit TSN: 0x%x, status: %d\n",
|
ntohl(chunk->subh.data_hdr->tsn),
|
ntohl(chunk->subh.data_hdr->tsn),
|
status);
|
status);
|
sctp_outq_head_data(q, chunk);
|
sctp_outq_head_data(q, chunk);
|
goto sctp_flush_out;
|
goto sctp_flush_out;
|
break;
|
break;
|
|
|
case SCTP_XMIT_OK:
|
case SCTP_XMIT_OK:
|
break;
|
break;
|
|
|
default:
|
default:
|
BUG();
|
BUG();
|
}
|
}
|
|
|
/* BUG: We assume that the (*q->force_output())
|
/* BUG: We assume that the (*q->force_output())
|
* call below will succeed all the time and add the
|
* call below will succeed all the time and add the
|
* chunk to the transmitted list and restart the
|
* chunk to the transmitted list and restart the
|
* timers.
|
* timers.
|
* It is possible that the call can fail under OOM
|
* It is possible that the call can fail under OOM
|
* conditions.
|
* conditions.
|
*
|
*
|
* Is this really a problem? Won't this behave
|
* Is this really a problem? Won't this behave
|
* like a lost TSN?
|
* like a lost TSN?
|
*/
|
*/
|
list_add_tail(&chunk->transmitted_list,
|
list_add_tail(&chunk->transmitted_list,
|
&transport->transmitted);
|
&transport->transmitted);
|
|
|
sctp_transport_reset_timers(transport);
|
sctp_transport_reset_timers(transport);
|
|
|
q->empty = 0;
|
q->empty = 0;
|
|
|
/* Only let one DATA chunk get bundled with a
|
/* Only let one DATA chunk get bundled with a
|
* COOKIE-ECHO chunk.
|
* COOKIE-ECHO chunk.
|
*/
|
*/
|
if (packet->has_cookie_echo)
|
if (packet->has_cookie_echo)
|
goto sctp_flush_out;
|
goto sctp_flush_out;
|
}
|
}
|
break;
|
break;
|
|
|
default:
|
default:
|
/* Do nothing. */
|
/* Do nothing. */
|
break;
|
break;
|
}
|
}
|
|
|
sctp_flush_out:
|
sctp_flush_out:
|
|
|
/* Before returning, examine all the transports touched in
|
/* Before returning, examine all the transports touched in
|
* this call. Right now, we bluntly force clear all the
|
* this call. Right now, we bluntly force clear all the
|
* transports. Things might change after we implement Nagle.
|
* transports. Things might change after we implement Nagle.
|
* But such an examination is still required.
|
* But such an examination is still required.
|
*
|
*
|
* --xguo
|
* --xguo
|
*/
|
*/
|
while ((ltransport = sctp_list_dequeue(&transport_list)) != NULL ) {
|
while ((ltransport = sctp_list_dequeue(&transport_list)) != NULL ) {
|
struct sctp_transport *t = list_entry(ltransport,
|
struct sctp_transport *t = list_entry(ltransport,
|
struct sctp_transport,
|
struct sctp_transport,
|
send_ready);
|
send_ready);
|
if (t != transport)
|
if (t != transport)
|
transport = t;
|
transport = t;
|
|
|
packet = &transport->packet;
|
packet = &transport->packet;
|
if (packet->size != SCTP_IP_OVERHEAD)
|
if (packet->size != SCTP_IP_OVERHEAD)
|
error = (*q->force_output)(packet);
|
error = (*q->force_output)(packet);
|
}
|
}
|
|
|
return error;
|
return error;
|
}
|
}
|
|
|
/* Set the various output handling callbacks. */
|
/* Set the various output handling callbacks. */
|
int sctp_outq_set_output_handlers(struct sctp_outq *q,
|
int sctp_outq_set_output_handlers(struct sctp_outq *q,
|
sctp_outq_ohandler_init_t init,
|
sctp_outq_ohandler_init_t init,
|
sctp_outq_ohandler_config_t config,
|
sctp_outq_ohandler_config_t config,
|
sctp_outq_ohandler_t append,
|
sctp_outq_ohandler_t append,
|
sctp_outq_ohandler_t build,
|
sctp_outq_ohandler_t build,
|
sctp_outq_ohandler_force_t force)
|
sctp_outq_ohandler_force_t force)
|
{
|
{
|
q->init_output = init;
|
q->init_output = init;
|
q->config_output = config;
|
q->config_output = config;
|
q->append_output = append;
|
q->append_output = append;
|
q->build_output = build;
|
q->build_output = build;
|
q->force_output = force;
|
q->force_output = force;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Update unack_data based on the incoming SACK chunk */
|
/* Update unack_data based on the incoming SACK chunk */
|
static void sctp_sack_update_unack_data(struct sctp_association *assoc,
|
static void sctp_sack_update_unack_data(struct sctp_association *assoc,
|
struct sctp_sackhdr *sack)
|
struct sctp_sackhdr *sack)
|
{
|
{
|
sctp_sack_variable_t *frags;
|
sctp_sack_variable_t *frags;
|
__u16 unack_data;
|
__u16 unack_data;
|
int i;
|
int i;
|
|
|
unack_data = assoc->next_tsn - assoc->ctsn_ack_point - 1;
|
unack_data = assoc->next_tsn - assoc->ctsn_ack_point - 1;
|
|
|
frags = sack->variable;
|
frags = sack->variable;
|
for (i = 0; i < ntohs(sack->num_gap_ack_blocks); i++) {
|
for (i = 0; i < ntohs(sack->num_gap_ack_blocks); i++) {
|
unack_data -= ((ntohs(frags[i].gab.end) -
|
unack_data -= ((ntohs(frags[i].gab.end) -
|
ntohs(frags[i].gab.start) + 1));
|
ntohs(frags[i].gab.start) + 1));
|
}
|
}
|
|
|
assoc->unack_data = unack_data;
|
assoc->unack_data = unack_data;
|
}
|
}
|
|
|
/* Return the highest new tsn that is acknowledged by the given SACK chunk. */
|
/* Return the highest new tsn that is acknowledged by the given SACK chunk. */
|
static __u32 sctp_highest_new_tsn(struct sctp_sackhdr *sack,
|
static __u32 sctp_highest_new_tsn(struct sctp_sackhdr *sack,
|
struct sctp_association *asoc)
|
struct sctp_association *asoc)
|
{
|
{
|
struct list_head *ltransport, *lchunk;
|
struct list_head *ltransport, *lchunk;
|
struct sctp_transport *transport;
|
struct sctp_transport *transport;
|
struct sctp_chunk *chunk;
|
struct sctp_chunk *chunk;
|
__u32 highest_new_tsn, tsn;
|
__u32 highest_new_tsn, tsn;
|
struct list_head *transport_list = &asoc->peer.transport_addr_list;
|
struct list_head *transport_list = &asoc->peer.transport_addr_list;
|
|
|
highest_new_tsn = ntohl(sack->cum_tsn_ack);
|
highest_new_tsn = ntohl(sack->cum_tsn_ack);
|
|
|
list_for_each(ltransport, transport_list) {
|
list_for_each(ltransport, transport_list) {
|
transport = list_entry(ltransport, struct sctp_transport,
|
transport = list_entry(ltransport, struct sctp_transport,
|
transports);
|
transports);
|
list_for_each(lchunk, &transport->transmitted) {
|
list_for_each(lchunk, &transport->transmitted) {
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
chunk = list_entry(lchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
tsn = ntohl(chunk->subh.data_hdr->tsn);
|
tsn = ntohl(chunk->subh.data_hdr->tsn);
|
|
|
if (!chunk->tsn_gap_acked &&
|
if (!chunk->tsn_gap_acked &&
|
TSN_lt(highest_new_tsn, tsn) &&
|
TSN_lt(highest_new_tsn, tsn) &&
|
sctp_acked(sack, tsn))
|
sctp_acked(sack, tsn))
|
highest_new_tsn = tsn;
|
highest_new_tsn = tsn;
|
}
|
}
|
}
|
}
|
|
|
return highest_new_tsn;
|
return highest_new_tsn;
|
}
|
}
|
|
|
/* This is where we REALLY process a SACK.
|
/* This is where we REALLY process a SACK.
|
*
|
*
|
* Process the SACK against the outqueue. Mostly, this just frees
|
* Process the SACK against the outqueue. Mostly, this just frees
|
* things off the transmitted queue.
|
* things off the transmitted queue.
|
*/
|
*/
|
int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
|
int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
|
{
|
{
|
struct sctp_association *asoc = q->asoc;
|
struct sctp_association *asoc = q->asoc;
|
struct sctp_transport *transport;
|
struct sctp_transport *transport;
|
struct sctp_chunk *tchunk;
|
struct sctp_chunk *tchunk;
|
struct list_head *lchunk, *transport_list, *pos, *temp;
|
struct list_head *lchunk, *transport_list, *pos, *temp;
|
sctp_sack_variable_t *frags = sack->variable;
|
sctp_sack_variable_t *frags = sack->variable;
|
__u32 sack_ctsn, ctsn, tsn;
|
__u32 sack_ctsn, ctsn, tsn;
|
__u32 highest_tsn, highest_new_tsn;
|
__u32 highest_tsn, highest_new_tsn;
|
__u32 sack_a_rwnd;
|
__u32 sack_a_rwnd;
|
unsigned outstanding;
|
unsigned outstanding;
|
struct sctp_transport *primary = asoc->peer.primary_path;
|
struct sctp_transport *primary = asoc->peer.primary_path;
|
int count_of_newacks = 0;
|
int count_of_newacks = 0;
|
|
|
/* Grab the association's destination address list. */
|
/* Grab the association's destination address list. */
|
transport_list = &asoc->peer.transport_addr_list;
|
transport_list = &asoc->peer.transport_addr_list;
|
|
|
sack_ctsn = ntohl(sack->cum_tsn_ack);
|
sack_ctsn = ntohl(sack->cum_tsn_ack);
|
|
|
/*
|
/*
|
* SFR-CACC algorithm:
|
* SFR-CACC algorithm:
|
* On receipt of a SACK the sender SHOULD execute the
|
* On receipt of a SACK the sender SHOULD execute the
|
* following statements.
|
* following statements.
|
*
|
*
|
* 1) If the cumulative ack in the SACK passes next tsn_at_change
|
* 1) If the cumulative ack in the SACK passes next tsn_at_change
|
* on the current primary, the CHANGEOVER_ACTIVE flag SHOULD be
|
* on the current primary, the CHANGEOVER_ACTIVE flag SHOULD be
|
* cleared. The CYCLING_CHANGEOVER flag SHOULD also be cleared for
|
* cleared. The CYCLING_CHANGEOVER flag SHOULD also be cleared for
|
* all destinations.
|
* all destinations.
|
*/
|
*/
|
if (TSN_lte(primary->cacc.next_tsn_at_change, sack_ctsn)) {
|
if (TSN_lte(primary->cacc.next_tsn_at_change, sack_ctsn)) {
|
primary->cacc.changeover_active = 0;
|
primary->cacc.changeover_active = 0;
|
list_for_each(pos, transport_list) {
|
list_for_each(pos, transport_list) {
|
transport = list_entry(pos, struct sctp_transport,
|
transport = list_entry(pos, struct sctp_transport,
|
transports);
|
transports);
|
transport->cacc.cycling_changeover = 0;
|
transport->cacc.cycling_changeover = 0;
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* SFR-CACC algorithm:
|
* SFR-CACC algorithm:
|
* 2) If the SACK contains gap acks and the flag CHANGEOVER_ACTIVE
|
* 2) If the SACK contains gap acks and the flag CHANGEOVER_ACTIVE
|
* is set the receiver of the SACK MUST take the following actions:
|
* is set the receiver of the SACK MUST take the following actions:
|
*
|
*
|
* A) Initialize the cacc_saw_newack to 0 for all destination
|
* A) Initialize the cacc_saw_newack to 0 for all destination
|
* addresses.
|
* addresses.
|
*/
|
*/
|
if (sack->num_gap_ack_blocks > 0 &&
|
if (sack->num_gap_ack_blocks > 0 &&
|
primary->cacc.changeover_active) {
|
primary->cacc.changeover_active) {
|
list_for_each(pos, transport_list) {
|
list_for_each(pos, transport_list) {
|
transport = list_entry(pos, struct sctp_transport,
|
transport = list_entry(pos, struct sctp_transport,
|
transports);
|
transports);
|
transport->cacc.cacc_saw_newack = 0;
|
transport->cacc.cacc_saw_newack = 0;
|
}
|
}
|
}
|
}
|
|
|
/* Get the highest TSN in the sack. */
|
/* Get the highest TSN in the sack. */
|
highest_tsn = sack_ctsn +
|
highest_tsn = sack_ctsn +
|
ntohs(frags[ntohs(sack->num_gap_ack_blocks) - 1].gab.end);
|
ntohs(frags[ntohs(sack->num_gap_ack_blocks) - 1].gab.end);
|
|
|
if (TSN_lt(asoc->highest_sacked, highest_tsn)) {
|
if (TSN_lt(asoc->highest_sacked, highest_tsn)) {
|
highest_new_tsn = highest_tsn;
|
highest_new_tsn = highest_tsn;
|
asoc->highest_sacked = highest_tsn;
|
asoc->highest_sacked = highest_tsn;
|
} else {
|
} else {
|
highest_new_tsn = sctp_highest_new_tsn(sack, asoc);
|
highest_new_tsn = sctp_highest_new_tsn(sack, asoc);
|
}
|
}
|
|
|
/* Run through the retransmit queue. Credit bytes received
|
/* Run through the retransmit queue. Credit bytes received
|
* and free those chunks that we can.
|
* and free those chunks that we can.
|
*/
|
*/
|
sctp_check_transmitted(q, &q->retransmit, NULL, sack, highest_new_tsn);
|
sctp_check_transmitted(q, &q->retransmit, NULL, sack, highest_new_tsn);
|
sctp_mark_missing(q, &q->retransmit, NULL, highest_new_tsn, 0);
|
sctp_mark_missing(q, &q->retransmit, NULL, highest_new_tsn, 0);
|
|
|
/* Run through the transmitted queue.
|
/* Run through the transmitted queue.
|
* Credit bytes received and free those chunks which we can.
|
* Credit bytes received and free those chunks which we can.
|
*
|
*
|
* This is a MASSIVE candidate for optimization.
|
* This is a MASSIVE candidate for optimization.
|
*/
|
*/
|
list_for_each(pos, transport_list) {
|
list_for_each(pos, transport_list) {
|
transport = list_entry(pos, struct sctp_transport,
|
transport = list_entry(pos, struct sctp_transport,
|
transports);
|
transports);
|
sctp_check_transmitted(q, &transport->transmitted,
|
sctp_check_transmitted(q, &transport->transmitted,
|
transport, sack, highest_new_tsn);
|
transport, sack, highest_new_tsn);
|
/*
|
/*
|
* SFR-CACC algorithm:
|
* SFR-CACC algorithm:
|
* C) Let count_of_newacks be the number of
|
* C) Let count_of_newacks be the number of
|
* destinations for which cacc_saw_newack is set.
|
* destinations for which cacc_saw_newack is set.
|
*/
|
*/
|
if (transport->cacc.cacc_saw_newack)
|
if (transport->cacc.cacc_saw_newack)
|
count_of_newacks ++;
|
count_of_newacks ++;
|
}
|
}
|
|
|
list_for_each(pos, transport_list) {
|
list_for_each(pos, transport_list) {
|
transport = list_entry(pos, struct sctp_transport,
|
transport = list_entry(pos, struct sctp_transport,
|
transports);
|
transports);
|
sctp_mark_missing(q, &transport->transmitted, transport,
|
sctp_mark_missing(q, &transport->transmitted, transport,
|
highest_new_tsn, count_of_newacks);
|
highest_new_tsn, count_of_newacks);
|
}
|
}
|
|
|
/* Move the Cumulative TSN Ack Point if appropriate. */
|
/* Move the Cumulative TSN Ack Point if appropriate. */
|
if (TSN_lt(asoc->ctsn_ack_point, sack_ctsn))
|
if (TSN_lt(asoc->ctsn_ack_point, sack_ctsn))
|
asoc->ctsn_ack_point = sack_ctsn;
|
asoc->ctsn_ack_point = sack_ctsn;
|
|
|
/* Update unack_data field in the assoc. */
|
/* Update unack_data field in the assoc. */
|
sctp_sack_update_unack_data(asoc, sack);
|
sctp_sack_update_unack_data(asoc, sack);
|
|
|
ctsn = asoc->ctsn_ack_point;
|
ctsn = asoc->ctsn_ack_point;
|
|
|
SCTP_DEBUG_PRINTK("%s: sack Cumulative TSN Ack is 0x%x.\n",
|
SCTP_DEBUG_PRINTK("%s: sack Cumulative TSN Ack is 0x%x.\n",
|
__FUNCTION__, sack_ctsn);
|
__FUNCTION__, sack_ctsn);
|
SCTP_DEBUG_PRINTK("%s: Cumulative TSN Ack of association "
|
SCTP_DEBUG_PRINTK("%s: Cumulative TSN Ack of association "
|
"%p is 0x%x.\n", __FUNCTION__, asoc, ctsn);
|
"%p is 0x%x.\n", __FUNCTION__, asoc, ctsn);
|
|
|
/* Throw away stuff rotting on the sack queue. */
|
/* Throw away stuff rotting on the sack queue. */
|
list_for_each_safe(lchunk, temp, &q->sacked) {
|
list_for_each_safe(lchunk, temp, &q->sacked) {
|
tchunk = list_entry(lchunk, struct sctp_chunk,
|
tchunk = list_entry(lchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
tsn = ntohl(tchunk->subh.data_hdr->tsn);
|
tsn = ntohl(tchunk->subh.data_hdr->tsn);
|
if (TSN_lte(tsn, ctsn))
|
if (TSN_lte(tsn, ctsn))
|
sctp_chunk_free(tchunk);
|
sctp_chunk_free(tchunk);
|
}
|
}
|
|
|
/* ii) Set rwnd equal to the newly received a_rwnd minus the
|
/* ii) Set rwnd equal to the newly received a_rwnd minus the
|
* number of bytes still outstanding after processing the
|
* number of bytes still outstanding after processing the
|
* Cumulative TSN Ack and the Gap Ack Blocks.
|
* Cumulative TSN Ack and the Gap Ack Blocks.
|
*/
|
*/
|
|
|
sack_a_rwnd = ntohl(sack->a_rwnd);
|
sack_a_rwnd = ntohl(sack->a_rwnd);
|
outstanding = q->outstanding_bytes;
|
outstanding = q->outstanding_bytes;
|
|
|
if (outstanding < sack_a_rwnd)
|
if (outstanding < sack_a_rwnd)
|
sack_a_rwnd -= outstanding;
|
sack_a_rwnd -= outstanding;
|
else
|
else
|
sack_a_rwnd = 0;
|
sack_a_rwnd = 0;
|
|
|
asoc->peer.rwnd = sack_a_rwnd;
|
asoc->peer.rwnd = sack_a_rwnd;
|
|
|
/* See if all chunks are acked.
|
/* See if all chunks are acked.
|
* Make sure the empty queue handler will get run later.
|
* Make sure the empty queue handler will get run later.
|
*/
|
*/
|
q->empty = skb_queue_empty(&q->out) && list_empty(&q->retransmit);
|
q->empty = skb_queue_empty(&q->out) && list_empty(&q->retransmit);
|
if (!q->empty)
|
if (!q->empty)
|
goto finish;
|
goto finish;
|
|
|
list_for_each(pos, transport_list) {
|
list_for_each(pos, transport_list) {
|
transport = list_entry(pos, struct sctp_transport,
|
transport = list_entry(pos, struct sctp_transport,
|
transports);
|
transports);
|
q->empty = q->empty && list_empty(&transport->transmitted);
|
q->empty = q->empty && list_empty(&transport->transmitted);
|
if (!q->empty)
|
if (!q->empty)
|
goto finish;
|
goto finish;
|
}
|
}
|
|
|
SCTP_DEBUG_PRINTK("sack queue is empty.\n");
|
SCTP_DEBUG_PRINTK("sack queue is empty.\n");
|
finish:
|
finish:
|
return q->empty;
|
return q->empty;
|
}
|
}
|
|
|
/* Is the outqueue empty? */
|
/* Is the outqueue empty? */
|
int sctp_outq_is_empty(const struct sctp_outq *q)
|
int sctp_outq_is_empty(const struct sctp_outq *q)
|
{
|
{
|
return q->empty;
|
return q->empty;
|
}
|
}
|
|
|
/********************************************************************
|
/********************************************************************
|
* 2nd Level Abstractions
|
* 2nd Level Abstractions
|
********************************************************************/
|
********************************************************************/
|
|
|
/* Go through a transport's transmitted list or the association's retransmit
|
/* Go through a transport's transmitted list or the association's retransmit
|
* list and move chunks that are acked by the Cumulative TSN Ack to q->sacked.
|
* list and move chunks that are acked by the Cumulative TSN Ack to q->sacked.
|
* The retransmit list will not have an associated transport.
|
* The retransmit list will not have an associated transport.
|
*
|
*
|
* I added coherent debug information output. --xguo
|
* I added coherent debug information output. --xguo
|
*
|
*
|
* Instead of printing 'sacked' or 'kept' for each TSN on the
|
* Instead of printing 'sacked' or 'kept' for each TSN on the
|
* transmitted_queue, we print a range: SACKED: TSN1-TSN2, TSN3, TSN4-TSN5.
|
* transmitted_queue, we print a range: SACKED: TSN1-TSN2, TSN3, TSN4-TSN5.
|
* KEPT TSN6-TSN7, etc.
|
* KEPT TSN6-TSN7, etc.
|
*/
|
*/
|
static void sctp_check_transmitted(struct sctp_outq *q,
|
static void sctp_check_transmitted(struct sctp_outq *q,
|
struct list_head *transmitted_queue,
|
struct list_head *transmitted_queue,
|
struct sctp_transport *transport,
|
struct sctp_transport *transport,
|
struct sctp_sackhdr *sack,
|
struct sctp_sackhdr *sack,
|
__u32 highest_new_tsn_in_sack)
|
__u32 highest_new_tsn_in_sack)
|
{
|
{
|
struct list_head *lchunk;
|
struct list_head *lchunk;
|
struct sctp_chunk *tchunk;
|
struct sctp_chunk *tchunk;
|
struct list_head tlist;
|
struct list_head tlist;
|
__u32 tsn;
|
__u32 tsn;
|
__u32 sack_ctsn;
|
__u32 sack_ctsn;
|
__u32 rtt;
|
__u32 rtt;
|
__u8 restart_timer = 0;
|
__u8 restart_timer = 0;
|
int bytes_acked = 0;
|
int bytes_acked = 0;
|
|
|
/* These state variables are for coherent debug output. --xguo */
|
/* These state variables are for coherent debug output. --xguo */
|
|
|
#if SCTP_DEBUG
|
#if SCTP_DEBUG
|
__u32 dbg_ack_tsn = 0; /* An ACKed TSN range starts here... */
|
__u32 dbg_ack_tsn = 0; /* An ACKed TSN range starts here... */
|
__u32 dbg_last_ack_tsn = 0; /* ...and finishes here. */
|
__u32 dbg_last_ack_tsn = 0; /* ...and finishes here. */
|
__u32 dbg_kept_tsn = 0; /* An un-ACKed range starts here... */
|
__u32 dbg_kept_tsn = 0; /* An un-ACKed range starts here... */
|
__u32 dbg_last_kept_tsn = 0; /* ...and finishes here. */
|
__u32 dbg_last_kept_tsn = 0; /* ...and finishes here. */
|
|
|
/* 0 : The last TSN was ACKed.
|
/* 0 : The last TSN was ACKed.
|
* 1 : The last TSN was NOT ACKed (i.e. KEPT).
|
* 1 : The last TSN was NOT ACKed (i.e. KEPT).
|
* -1: We need to initialize.
|
* -1: We need to initialize.
|
*/
|
*/
|
int dbg_prt_state = -1;
|
int dbg_prt_state = -1;
|
#endif /* SCTP_DEBUG */
|
#endif /* SCTP_DEBUG */
|
|
|
sack_ctsn = ntohl(sack->cum_tsn_ack);
|
sack_ctsn = ntohl(sack->cum_tsn_ack);
|
|
|
INIT_LIST_HEAD(&tlist);
|
INIT_LIST_HEAD(&tlist);
|
|
|
/* The while loop will skip empty transmitted queues. */
|
/* The while loop will skip empty transmitted queues. */
|
while (NULL != (lchunk = sctp_list_dequeue(transmitted_queue))) {
|
while (NULL != (lchunk = sctp_list_dequeue(transmitted_queue))) {
|
tchunk = list_entry(lchunk, struct sctp_chunk,
|
tchunk = list_entry(lchunk, struct sctp_chunk,
|
transmitted_list);
|
transmitted_list);
|
|
|
tsn = ntohl(tchunk->subh.data_hdr->tsn);
|
tsn = ntohl(tchunk->subh.data_hdr->tsn);
|
if (sctp_acked(sack, tsn)) {
|
if (sctp_acked(sack, tsn)) {
|
/* If this queue is the retransmit queue, the
|
/* If this queue is the retransmit queue, the
|
* retransmit timer has already reclaimed
|
* retransmit timer has already reclaimed
|
* the outstanding bytes for this chunk, so only
|
* the outstanding bytes for this chunk, so only
|
* count bytes associated with a transport.
|
* count bytes associated with a transport.
|
*/
|
*/
|
if (transport) {
|
if (transport) {
|
/* If this chunk is being used for RTT
|
/* If this chunk is being used for RTT
|
* measurement, calculate the RTT and update
|
* measurement, calculate the RTT and update
|
* the RTO using this value.
|
* the RTO using this value.
|
*
|
*
|
* 6.3.1 C5) Karn's algorithm: RTT measurements
|
* 6.3.1 C5) Karn's algorithm: RTT measurements
|
* MUST NOT be made using packets that were
|
* MUST NOT be made using packets that were
|
* retransmitted (and thus for which it is
|
* retransmitted (and thus for which it is
|
* ambiguous whether the reply was for the
|
* ambiguous whether the reply was for the
|
* first instance of the packet or a later
|
* first instance of the packet or a later
|
* instance).
|
* instance).
|
*/
|
*/
|
if (!tchunk->tsn_gap_acked &&
|
if (!tchunk->tsn_gap_acked &&
|
!tchunk->resent &&
|
!tchunk->resent &&
|
tchunk->rtt_in_progress) {
|
tchunk->rtt_in_progress) {
|
rtt = jiffies - tchunk->sent_at;
|
rtt = jiffies - tchunk->sent_at;
|
sctp_transport_update_rto(transport,
|
sctp_transport_update_rto(transport,
|
rtt);
|
rtt);
|
}
|
}
|
}
|
}
|
if (TSN_lte(tsn, sack_ctsn)) {
|
if (TSN_lte(tsn, sack_ctsn)) {
|
/* RFC 2960 6.3.2 Retransmission Timer Rules
|
/* RFC 2960 6.3.2 Retransmission Timer Rules
|
*
|
*
|
* R3) Whenever a SACK is received
|
* R3) Whenever a SACK is received
|
* that acknowledges the DATA chunk
|
* that acknowledges the DATA chunk
|
* with the earliest outstanding TSN
|
* with the earliest outstanding TSN
|
* for that address, restart T3-rtx
|
* for that address, restart T3-rtx
|
* timer for that address with its
|
* timer for that address with its
|
* current RTO.
|
* current RTO.
|
*/
|
*/
|
restart_timer = 1;
|
restart_timer = 1;
|
|
|
if (!tchunk->tsn_gap_acked) {
|
if (!tchunk->tsn_gap_acked) {
|
tchunk->tsn_gap_acked = 1;
|
tchunk->tsn_gap_acked = 1;
|
bytes_acked += sctp_data_size(tchunk);
|
bytes_acked += sctp_data_size(tchunk);
|
/*
|
/*
|
* SFR-CACC algorithm:
|
* SFR-CACC algorithm:
|
* 2) If the SACK contains gap acks
|
* 2) If the SACK contains gap acks
|
* and the flag CHANGEOVER_ACTIVE is
|
* and the flag CHANGEOVER_ACTIVE is
|
* set the receiver of the SACK MUST
|
* set the receiver of the SACK MUST
|
* take the following action:
|
* take the following action:
|
*
|
*
|
* B) For each TSN t being acked that
|
* B) For each TSN t being acked that
|
* has not been acked in any SACK so
|
* has not been acked in any SACK so
|
* far, set cacc_saw_newack to 1 for
|
* far, set cacc_saw_newack to 1 for
|
* the destination that the TSN was
|
* the destination that the TSN was
|
* sent to.
|
* sent to.
|
*/
|
*/
|
if (transport &&
|
if (transport &&
|
sack->num_gap_ack_blocks &&
|
sack->num_gap_ack_blocks &&
|
q->asoc->peer.primary_path->cacc.
|
q->asoc->peer.primary_path->cacc.
|
changeover_active)
|
changeover_active)
|
transport->cacc.cacc_saw_newack
|
transport->cacc.cacc_saw_newack
|
= 1;
|
= 1;
|
}
|
}
|
|
|
list_add_tail(&tchunk->transmitted_list,
|
list_add_tail(&tchunk->transmitted_list,
|
&q->sacked);
|
&q->sacked);
|
} else {
|
} else {
|
/* RFC2960 7.2.4, sctpimpguide-05 2.8.2
|
/* RFC2960 7.2.4, sctpimpguide-05 2.8.2
|
* M2) Each time a SACK arrives reporting
|
* M2) Each time a SACK arrives reporting
|
* 'Stray DATA chunk(s)' record the highest TSN
|
* 'Stray DATA chunk(s)' record the highest TSN
|
* reported as newly acknowledged, call this
|
* reported as newly acknowledged, call this
|
* value 'HighestTSNinSack'. A newly
|
* value 'HighestTSNinSack'. A newly
|
* acknowledged DATA chunk is one not
|
* acknowledged DATA chunk is one not
|
* previously acknowledged in a SACK.
|
* previously acknowledged in a SACK.
|
*
|
*
|
* When the SCTP sender of data receives a SACK
|
* When the SCTP sender of data receives a SACK
|
* chunk that acknowledges, for the first time,
|
* chunk that acknowledges, for the first time,
|
* the receipt of a DATA chunk, all the still
|
* the receipt of a DATA chunk, all the still
|
* unacknowledged DATA chunks whose TSN is
|
* unacknowledged DATA chunks whose TSN is
|
* older than that newly acknowledged DATA
|
* older than that newly acknowledged DATA
|
* chunk, are qualified as 'Stray DATA chunks'.
|
* chunk, are qualified as 'Stray DATA chunks'.
|
*/
|
*/
|
if (!tchunk->tsn_gap_acked) {
|
if (!tchunk->tsn_gap_acked) {
|
tchunk->tsn_gap_acked = 1;
|
tchunk->tsn_gap_acked = 1;
|
bytes_acked += sctp_data_size(tchunk);
|
bytes_acked += sctp_data_size(tchunk);
|
}
|
}
|
list_add_tail(lchunk, &tlist);
|
list_add_tail(lchunk, &tlist);
|
}
|
}
|
|
|
#if SCTP_DEBUG
|
#if SCTP_DEBUG
|
switch (dbg_prt_state) {
|
switch (dbg_prt_state) {
|
case 0: /* last TSN was ACKed */
|
case 0: /* last TSN was ACKed */
|
if (dbg_last_ack_tsn + 1 == tsn) {
|
if (dbg_last_ack_tsn + 1 == tsn) {
|
/* This TSN belongs to the
|
/* This TSN belongs to the
|
* current ACK range.
|
* current ACK range.
|
*/
|
*/
|
break;
|
break;
|
}
|
}
|
|
|
if (dbg_last_ack_tsn != dbg_ack_tsn) {
|
if (dbg_last_ack_tsn != dbg_ack_tsn) {
|
/* Display the end of the
|
/* Display the end of the
|
* current range.
|
* current range.
|
*/
|
*/
|
SCTP_DEBUG_PRINTK("-%08x",
|
SCTP_DEBUG_PRINTK("-%08x",
|
dbg_last_ack_tsn);
|
dbg_last_ack_tsn);
|
}
|
}
|
|
|
/* Start a new range. */
|
/* Start a new range. */
|
SCTP_DEBUG_PRINTK(",%08x", tsn);
|
SCTP_DEBUG_PRINTK(",%08x", tsn);
|
dbg_ack_tsn = tsn;
|
dbg_ack_tsn = tsn;
|
break;
|
break;
|
|
|
case 1: /* The last TSN was NOT ACKed. */
|
case 1: /* The last TSN was NOT ACKed. */
|
if (dbg_last_kept_tsn != dbg_kept_tsn) {
|
if (dbg_last_kept_tsn != dbg_kept_tsn) {
|
/* Display the end of current range. */
|
/* Display the end of current range. */
|
SCTP_DEBUG_PRINTK("-%08x",
|
SCTP_DEBUG_PRINTK("-%08x",
|
dbg_last_kept_tsn);
|
dbg_last_kept_tsn);
|
}
|
}
|
|
|
SCTP_DEBUG_PRINTK("\n");
|
SCTP_DEBUG_PRINTK("\n");
|
|
|
/* FALL THROUGH... */
|
/* FALL THROUGH... */
|
default:
|
default:
|
/* This is the first-ever TSN we examined. */
|
/* This is the first-ever TSN we examined. */
|
/* Start a new range of ACK-ed TSNs. */
|
/* Start a new range of ACK-ed TSNs. */
|
SCTP_DEBUG_PRINTK("ACKed: %08x", tsn);
|
SCTP_DEBUG_PRINTK("ACKed: %08x", tsn);
|
dbg_prt_state = 0;
|
dbg_prt_state = 0;
|
dbg_ack_tsn = tsn;
|
dbg_ack_tsn = tsn;
|
};
|
};
|
|
|
dbg_last_ack_tsn = tsn;
|
dbg_last_ack_tsn = tsn;
|
#endif /* SCTP_DEBUG */
|
#endif /* SCTP_DEBUG */
|
|
|
} else {
|
} else {
|
if (tchunk->tsn_gap_acked) {
|
if (tchunk->tsn_gap_acked) {
|
SCTP_DEBUG_PRINTK("%s: Receiver reneged on "
|
SCTP_DEBUG_PRINTK("%s: Receiver reneged on "
|
"data TSN: 0x%x\n",
|
"data TSN: 0x%x\n",
|
__FUNCTION__,
|
__FUNCTION__,
|
tsn);
|
tsn);
|
tchunk->tsn_gap_acked = 0;
|
tchunk->tsn_gap_acked = 0;
|
|
|
bytes_acked -= sctp_data_size(tchunk);
|
bytes_acked -= sctp_data_size(tchunk);
|
|
|
/* RFC 2960 6.3.2 Retransmission Timer Rules
|
/* RFC 2960 6.3.2 Retransmission Timer Rules
|
*
|
*
|
* R4) Whenever a SACK is received missing a
|
* R4) Whenever a SACK is received missing a
|
* TSN that was previously acknowledged via a
|
* TSN that was previously acknowledged via a
|
* Gap Ack Block, start T3-rtx for the
|
* Gap Ack Block, start T3-rtx for the
|
* destination address to which the DATA
|
* destination address to which the DATA
|
* chunk was originally
|
* chunk was originally
|
* transmitted if it is not already running.
|
* transmitted if it is not already running.
|
*/
|
*/
|
restart_timer = 1;
|
restart_timer = 1;
|
}
|
}
|
|
|
list_add_tail(lchunk, &tlist);
|
list_add_tail(lchunk, &tlist);
|
|
|
#if SCTP_DEBUG
|
#if SCTP_DEBUG
|
/* See the above comments on ACK-ed TSNs. */
|
/* See the above comments on ACK-ed TSNs. */
|
switch (dbg_prt_state) {
|
switch (dbg_prt_state) {
|
case 1:
|
case 1:
|
if (dbg_last_kept_tsn + 1 == tsn)
|
if (dbg_last_kept_tsn + 1 == tsn)
|
break;
|
break;
|
|
|
if (dbg_last_kept_tsn != dbg_kept_tsn)
|
if (dbg_last_kept_tsn != dbg_kept_tsn)
|
SCTP_DEBUG_PRINTK("-%08x",
|
SCTP_DEBUG_PRINTK("-%08x",
|
dbg_last_kept_tsn);
|
dbg_last_kept_tsn);
|
|
|
SCTP_DEBUG_PRINTK(",%08x", tsn);
|
SCTP_DEBUG_PRINTK(",%08x", tsn);
|
dbg_kept_tsn = tsn;
|
dbg_kept_tsn = tsn;
|
break;
|
break;
|
|
|
case 0:
|
case 0:
|
if (dbg_last_ack_tsn != dbg_ack_tsn)
|
if (dbg_last_ack_tsn != dbg_ack_tsn)
|
SCTP_DEBUG_PRINTK("-%08x",
|
SCTP_DEBUG_PRINTK("-%08x",
|
dbg_last_ack_tsn);
|
dbg_last_ack_tsn);
|
SCTP_DEBUG_PRINTK("\n");
|
SCTP_DEBUG_PRINTK("\n");
|
|
|
/* FALL THROUGH... */
|
/* FALL THROUGH... */
|
default:
|
default:
|
SCTP_DEBUG_PRINTK("KEPT: %08x",tsn);
|
SCTP_DEBUG_PRINTK("KEPT: %08x",tsn);
|
dbg_prt_state = 1;
|
dbg_prt_state = 1;
|
dbg_kept_tsn = tsn;
|
dbg_kept_tsn = tsn;
|
};
|
};
|
|
|
dbg_last_kept_tsn = tsn;
|
dbg_last_kept_tsn = tsn;
|
#endif /* SCTP_DEBUG */
|
#endif /* SCTP_DEBUG */
|
}
|
}
|
}
|
}
|
|
|
#if SCTP_DEBUG
|
#if SCTP_DEBUG
|
/* Finish off the last range, displaying its ending TSN. */
|
/* Finish off the last range, displaying its ending TSN. */
|
switch (dbg_prt_state) {
|
switch (dbg_prt_state) {
|
case 0:
|
case 0:
|
if (dbg_last_ack_tsn != dbg_ack_tsn) {
|
if (dbg_last_ack_tsn != dbg_ack_tsn) {
|
SCTP_DEBUG_PRINTK("-%08x\n", dbg_last_ack_tsn);
|
SCTP_DEBUG_PRINTK("-%08x\n", dbg_last_ack_tsn);
|
} else {
|
} else {
|
SCTP_DEBUG_PRINTK("\n");
|
SCTP_DEBUG_PRINTK("\n");
|
}
|
}
|
break;
|
break;
|
|
|
case 1:
|
case 1:
|
if (dbg_last_kept_tsn != dbg_kept_tsn) {
|
if (dbg_last_kept_tsn != dbg_kept_tsn) {
|
SCTP_DEBUG_PRINTK("-%08x\n", dbg_last_kept_tsn);
|
SCTP_DEBUG_PRINTK("-%08x\n", dbg_last_kept_tsn);
|
} else {
|
} else {
|
SCTP_DEBUG_PRINTK("\n");
|
SCTP_DEBUG_PRINTK("\n");
|
}
|
}
|
};
|
};
|
#endif /* SCTP_DEBUG */
|
#endif /* SCTP_DEBUG */
|
if (transport) {
|
if (transport) {
|
if (bytes_acked) {
|
if (bytes_acked) {
|
/* 8.2. When an outstanding TSN is acknowledged,
|
/* 8.2. When an outstanding TSN is acknowledged,
|
* the endpoint shall clear the error counter of
|
* the endpoint shall clear the error counter of
|
* the destination transport address to which the
|
* the destination transport address to which the
|
* DATA chunk was last sent.
|
* DATA chunk was last sent.
|
* The association's overall error counter is
|
* The association's overall error counter is
|
* also cleared.
|
* also cleared.
|
*/
|
*/
|
transport->error_count = 0;
|
transport->error_count = 0;
|
transport->asoc->overall_error_count = 0;
|
transport->asoc->overall_error_count = 0;
|
|
|
/* Mark the destination transport address as
|
/* Mark the destination transport address as
|
* active if it is not so marked.
|
* active if it is not so marked.
|
*/
|
*/
|
if (!transport->active) {
|
if (!transport->active) {
|
sctp_assoc_control_transport(
|
sctp_assoc_control_transport(
|
transport->asoc,
|
transport->asoc,
|
transport,
|
transport,
|
SCTP_TRANSPORT_UP,
|
SCTP_TRANSPORT_UP,
|
SCTP_RECEIVED_SACK);
|
SCTP_RECEIVED_SACK);
|
}
|
}
|
|
|
sctp_transport_raise_cwnd(transport, sack_ctsn,
|
sctp_transport_raise_cwnd(transport, sack_ctsn,
|
bytes_acked);
|
bytes_acked);
|
|
|
transport->flight_size -= bytes_acked;
|
transport->flight_size -= bytes_acked;
|
q->outstanding_bytes -= bytes_acked;
|
q->outstanding_bytes -= bytes_acked;
|
} else {
|
} else {
|
/* RFC 2960 6.1, sctpimpguide-06 2.15.2
|
/* RFC 2960 6.1, sctpimpguide-06 2.15.2
|
* When a sender is doing zero window probing, it
|
* When a sender is doing zero window probing, it
|
* should not timeout the association if it continues
|
* should not timeout the association if it continues
|
* to receive new packets from the receiver. The
|
* to receive new packets from the receiver. The
|
* reason is that the receiver MAY keep its window
|
* reason is that the receiver MAY keep its window
|
* closed for an indefinite time.
|
* closed for an indefinite time.
|
* A sender is doing zero window probing when the
|
* A sender is doing zero window probing when the
|
* receiver's advertised window is zero, and there is
|
* receiver's advertised window is zero, and there is
|
* only one data chunk in flight to the receiver.
|
* only one data chunk in flight to the receiver.
|
*/
|
*/
|
if (!q->asoc->peer.rwnd &&
|
if (!q->asoc->peer.rwnd &&
|
!list_empty(&tlist) &&
|
!list_empty(&tlist) &&
|
(sack_ctsn+2 == q->asoc->next_tsn)) {
|
(sack_ctsn+2 == q->asoc->next_tsn)) {
|
SCTP_DEBUG_PRINTK("%s: SACK received for zero "
|
SCTP_DEBUG_PRINTK("%s: SACK received for zero "
|
"window probe: %u\n",
|
"window probe: %u\n",
|
__FUNCTION__, sack_ctsn);
|
__FUNCTION__, sack_ctsn);
|
q->asoc->overall_error_count = 0;
|
q->asoc->overall_error_count = 0;
|
transport->error_count = 0;
|
transport->error_count = 0;
|
}
|
}
|
}
|
}
|
|
|
/* RFC 2960 6.3.2 Retransmission Timer Rules
|
/* RFC 2960 6.3.2 Retransmission Timer Rules
|
*
|
*
|
* R2) Whenever all outstanding data sent to an address have
|
* R2) Whenever all outstanding data sent to an address have
|
* been acknowledged, turn off the T3-rtx timer of that
|
* been acknowledged, turn off the T3-rtx timer of that
|
* address.
|
* address.
|
*/
|
*/
|
if (!transport->flight_size) {
|
if (!transport->flight_size) {
|
if (timer_pending(&transport->T3_rtx_timer) &&
|
if (timer_pending(&transport->T3_rtx_timer) &&
|
del_timer(&transport->T3_rtx_timer)) {
|
del_timer(&transport->T3_rtx_timer)) {
|
sctp_transport_put(transport);
|
sctp_transport_put(transport);
|
}
|
}
|
} else if (restart_timer) {
|
} else if (restart_timer) {
|
if (!mod_timer(&transport->T3_rtx_timer,
|
if (!mod_timer(&transport->T3_rtx_timer,
|
jiffies + transport->rto))
|
jiffies + transport->rto))
|
sctp_transport_hold(transport);
|
sctp_transport_hold(transport);
|
}
|
}
|
}
|
}
|
|
|
list_splice(&tlist, transmitted_queue);
|
list_splice(&tlist, transmitted_queue);
|
}
|
}
|
|
|
/* Mark chunks as missing and consequently may get retransmitted. */
|
/* Mark chunks as missing and consequently may get retransmitted. */
|
static void sctp_mark_missing(struct sctp_outq *q,
|
static void sctp_mark_missing(struct sctp_outq *q,
|
struct list_head *transmitted_queue,
|
struct list_head *transmitted_queue,
|
struct sctp_transport *transport,
|
struct sctp_transport *transport,
|
__u32 highest_new_tsn_in_sack,
|
__u32 highest_new_tsn_in_sack,
|
int count_of_newacks)
|
int count_of_newacks)
|
{
|
{
|
struct sctp_chunk *chunk;
|
struct sctp_chunk *chunk;
|
struct list_head *pos;
|
struct list_head *pos;
|
__u32 tsn;
|
__u32 tsn;
|
char do_fast_retransmit = 0;
|
char do_fast_retransmit = 0;
|
struct sctp_transport *primary = q->asoc->peer.primary_path;
|
struct sctp_transport *primary = q->asoc->peer.primary_path;
|
|
|
list_for_each(pos, transmitted_queue) {
|
list_for_each(pos, transmitted_queue) {
|
|
|
chunk = list_entry(pos, struct sctp_chunk, transmitted_list);
|
chunk = list_entry(pos, struct sctp_chunk, transmitted_list);
|
tsn = ntohl(chunk->subh.data_hdr->tsn);
|
tsn = ntohl(chunk->subh.data_hdr->tsn);
|
|
|
/* RFC 2960 7.2.4, sctpimpguide-05 2.8.2 M3) Examine all
|
/* RFC 2960 7.2.4, sctpimpguide-05 2.8.2 M3) Examine all
|
* 'Unacknowledged TSN's', if the TSN number of an
|
* 'Unacknowledged TSN's', if the TSN number of an
|
* 'Unacknowledged TSN' is smaller than the 'HighestTSNinSack'
|
* 'Unacknowledged TSN' is smaller than the 'HighestTSNinSack'
|
* value, increment the 'TSN.Missing.Report' count on that
|
* value, increment the 'TSN.Missing.Report' count on that
|
* chunk if it has NOT been fast retransmitted or marked for
|
* chunk if it has NOT been fast retransmitted or marked for
|
* fast retransmit already.
|
* fast retransmit already.
|
*/
|
*/
|
if (!chunk->fast_retransmit &&
|
if (!chunk->fast_retransmit &&
|
!chunk->tsn_gap_acked &&
|
!chunk->tsn_gap_acked &&
|
TSN_lt(tsn, highest_new_tsn_in_sack)) {
|
TSN_lt(tsn, highest_new_tsn_in_sack)) {
|
|
|
/* SFR-CACC may require us to skip marking
|
/* SFR-CACC may require us to skip marking
|
* this chunk as missing.
|
* this chunk as missing.
|
*/
|
*/
|
if (!transport || !sctp_cacc_skip(primary, transport,
|
if (!transport || !sctp_cacc_skip(primary, transport,
|
count_of_newacks, tsn)) {
|
count_of_newacks, tsn)) {
|
chunk->tsn_missing_report++;
|
chunk->tsn_missing_report++;
|
|
|
SCTP_DEBUG_PRINTK(
|
SCTP_DEBUG_PRINTK(
|
"%s: TSN 0x%x missing counter: %d\n",
|
"%s: TSN 0x%x missing counter: %d\n",
|
__FUNCTION__, tsn,
|
__FUNCTION__, tsn,
|
chunk->tsn_missing_report);
|
chunk->tsn_missing_report);
|
}
|
}
|
}
|
}
|
/*
|
/*
|
* M4) If any DATA chunk is found to have a
|
* M4) If any DATA chunk is found to have a
|
* 'TSN.Missing.Report'
|
* 'TSN.Missing.Report'
|
* value larger than or equal to 4, mark that chunk for
|
* value larger than or equal to 4, mark that chunk for
|
* retransmission and start the fast retransmit procedure.
|
* retransmission and start the fast retransmit procedure.
|
*/
|
*/
|
|
|
if (chunk->tsn_missing_report >= 4) {
|
if (chunk->tsn_missing_report >= 4) {
|
chunk->fast_retransmit = 1;
|
chunk->fast_retransmit = 1;
|
do_fast_retransmit = 1;
|
do_fast_retransmit = 1;
|
}
|
}
|
}
|
}
|
|
|
if (transport) {
|
if (transport) {
|
if (do_fast_retransmit)
|
if (do_fast_retransmit)
|
sctp_retransmit(q, transport, SCTP_RTXR_FAST_RTX);
|
sctp_retransmit(q, transport, SCTP_RTXR_FAST_RTX);
|
|
|
SCTP_DEBUG_PRINTK("%s: transport: %p, cwnd: %d, "
|
SCTP_DEBUG_PRINTK("%s: transport: %p, cwnd: %d, "
|
"ssthresh: %d, flight_size: %d, pba: %d\n",
|
"ssthresh: %d, flight_size: %d, pba: %d\n",
|
__FUNCTION__, transport, transport->cwnd,
|
__FUNCTION__, transport, transport->cwnd,
|
transport->ssthresh, transport->flight_size,
|
transport->ssthresh, transport->flight_size,
|
transport->partial_bytes_acked);
|
transport->partial_bytes_acked);
|
}
|
}
|
}
|
}
|
|
|
/* Is the given TSN acked by this packet? */
|
/* Is the given TSN acked by this packet? */
|
static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn)
|
static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn)
|
{
|
{
|
int i;
|
int i;
|
sctp_sack_variable_t *frags;
|
sctp_sack_variable_t *frags;
|
__u16 gap;
|
__u16 gap;
|
__u32 ctsn = ntohl(sack->cum_tsn_ack);
|
__u32 ctsn = ntohl(sack->cum_tsn_ack);
|
|
|
if (TSN_lte(tsn, ctsn))
|
if (TSN_lte(tsn, ctsn))
|
goto pass;
|
goto pass;
|
|
|
/* 3.3.4 Selective Acknowledgement (SACK) (3):
|
/* 3.3.4 Selective Acknowledgement (SACK) (3):
|
*
|
*
|
* Gap Ack Blocks:
|
* Gap Ack Blocks:
|
* These fields contain the Gap Ack Blocks. They are repeated
|
* These fields contain the Gap Ack Blocks. They are repeated
|
* for each Gap Ack Block up to the number of Gap Ack Blocks
|
* for each Gap Ack Block up to the number of Gap Ack Blocks
|
* defined in the Number of Gap Ack Blocks field. All DATA
|
* defined in the Number of Gap Ack Blocks field. All DATA
|
* chunks with TSNs greater than or equal to (Cumulative TSN
|
* chunks with TSNs greater than or equal to (Cumulative TSN
|
* Ack + Gap Ack Block Start) and less than or equal to
|
* Ack + Gap Ack Block Start) and less than or equal to
|
* (Cumulative TSN Ack + Gap Ack Block End) of each Gap Ack
|
* (Cumulative TSN Ack + Gap Ack Block End) of each Gap Ack
|
* Block are assumed to have been received correctly.
|
* Block are assumed to have been received correctly.
|
*/
|
*/
|
|
|
frags = sack->variable;
|
frags = sack->variable;
|
gap = tsn - ctsn;
|
gap = tsn - ctsn;
|
for (i = 0; i < ntohs(sack->num_gap_ack_blocks); ++i) {
|
for (i = 0; i < ntohs(sack->num_gap_ack_blocks); ++i) {
|
if (TSN_lte(ntohs(frags[i].gab.start), gap) &&
|
if (TSN_lte(ntohs(frags[i].gab.start), gap) &&
|
TSN_lte(gap, ntohs(frags[i].gab.end)))
|
TSN_lte(gap, ntohs(frags[i].gab.end)))
|
goto pass;
|
goto pass;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
pass:
|
pass:
|
return 1;
|
return 1;
|
}
|
}
|
|
|
