xref: /kernel/linux/linux-5.10/include/net/sctp/ulpqueue.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SCTP kernel implementation
 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001 Intel Corp.
 * Copyright (c) 2001 Nokia, Inc.
 * Copyright (c) 2001 La Monte H.P. Yarroll
 *
 * These are the definitions needed for the sctp_ulpq type.  The
 * sctp_ulpq is the interface between the Upper Layer Protocol, or ULP,
 * and the core SCTP state machine.  This is the component which handles
 * reassembly and ordering.
 *
 * Please send any bug reports or fixes you make to the
 * email addresses:
 *    lksctp developers <linux-sctp@vger.kernel.org>
 *
 * Written or modified by:
 *   Jon Grimm             <jgrimm@us.ibm.com>
 *   La Monte H.P. Yarroll <piggy@acm.org>
 *   Sridhar Samudrala     <sri@us.ibm.com>
 */

#ifndef __sctp_ulpqueue_h__
#define __sctp_ulpqueue_h__

/* A structure to carry information to the ULP (e.g. Sockets API) */
struct sctp_ulpq {
	char pd_mode;
	struct sctp_association *asoc;
	struct sk_buff_head reasm;
	struct sk_buff_head reasm_uo;
	struct sk_buff_head lobby;
};

/* Prototypes. */
struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *,
				 struct sctp_association *);
void sctp_ulpq_flush(struct sctp_ulpq *ulpq);
void sctp_ulpq_free(struct sctp_ulpq *);

/* Add a new DATA chunk for processing. */
int sctp_ulpq_tail_data(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);

/* Add a new event for propagation to the ULP. */
int sctp_ulpq_tail_event(struct sctp_ulpq *, struct sk_buff_head *skb_list);

/* Renege previously received chunks.  */
void sctp_ulpq_renege(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);

/* Perform partial delivery. */
void sctp_ulpq_partial_delivery(struct sctp_ulpq *, gfp_t);

/* Abort the partial delivery. */
void sctp_ulpq_abort_pd(struct sctp_ulpq *, gfp_t);

/* Clear the partial data delivery condition on this socket. */
int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc);

/* Skip over an SSN. */
void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn);

void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *, __u32);

__u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,
			    struct sk_buff_head *list, __u16 needed);

#endif /* __sctp_ulpqueue_h__ */