include/net/sctp/ulpqueue.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* SCTP kernel implementation
   3  * (C) Copyright IBM Corp. 2001, 2004
   4  * Copyright (c) 1999-2000 Cisco, Inc.
   5  * Copyright (c) 1999-2001 Motorola, Inc.
   6  * Copyright (c) 2001 Intel Corp.
   7  * Copyright (c) 2001 Nokia, Inc.
   8  * Copyright (c) 2001 La Monte H.P. Yarroll
   9  *
  10  * These are the definitions needed for the sctp_ulpq type.  The
  11  * sctp_ulpq is the interface between the Upper Layer Protocol, or ULP,
  12  * and the core SCTP state machine.  This is the component which handles
  13  * reassembly and ordering.
  14  *
  15  * Please send any bug reports or fixes you make to the
  16  * email addresses:
  17  *    lksctp developers <linux-sctp@vger.kernel.org>
  18  *
  19  * Written or modified by:
  20  *   Jon Grimm             <jgrimm@us.ibm.com>
  21  *   La Monte H.P. Yarroll <piggy@acm.org>
  22  *   Sridhar Samudrala     <sri@us.ibm.com>
  23  */
  24
  25 #ifndef __sctp_ulpqueue_h__
  26 #define __sctp_ulpqueue_h__
  27
  28 /* A structure to carry information to the ULP (e.g. Sockets API) */
  29 struct sctp_ulpq {
  30         char pd_mode;
  31         struct sctp_association *asoc;
  32         struct sk_buff_head reasm;
  33         struct sk_buff_head reasm_uo;
  34         struct sk_buff_head lobby;
  35 };
  36
  37 /* Prototypes. */
  38 struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *,
  39                                  struct sctp_association *);
  40 void sctp_ulpq_flush(struct sctp_ulpq *ulpq);
  41 void sctp_ulpq_free(struct sctp_ulpq *);
  42
  43 /* Add a new DATA chunk for processing. */
  44 int sctp_ulpq_tail_data(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);
  45
  46 /* Add a new event for propagation to the ULP. */
  47 int sctp_ulpq_tail_event(struct sctp_ulpq *, struct sk_buff_head *skb_list);
  48
  49 /* Renege previously received chunks.  */
  50 void sctp_ulpq_renege(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);
  51
  52 /* Perform partial delivery. */
  53 void sctp_ulpq_partial_delivery(struct sctp_ulpq *, gfp_t);
  54
  55 /* Abort the partial delivery. */
  56 void sctp_ulpq_abort_pd(struct sctp_ulpq *, gfp_t);
  57
  58 /* Clear the partial data delivery condition on this socket. */
  59 int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc);
  60
  61 /* Skip over an SSN. */
  62 void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn);
  63
  64 void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *, __u32);
  65
  66 __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,
  67                             struct sk_buff_head *list, __u16 needed);
  68
  69 #endif /* __sctp_ulpqueue_h__ */