// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/dccp/feat.c
*
* Feature negotiation for the DCCP protocol (RFC 4340, section 6)
*
* Copyright (c) 2008 Gerrit Renker <gerrit@erg.abdn.ac.uk>
* Rewrote from scratch, some bits from earlier code by
* Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
*
* ASSUMPTIONS
* -----------
* o Feature negotiation is coordinated with connection setup (as in TCP), wild
* changes of parameters of an established connection are not supported.
* o Changing non-negotiable (NN) values is supported in state OPEN/PARTOPEN.
* o All currently known SP features have 1-byte quantities. If in the future
* extensions of RFCs 4340..42 define features with item lengths larger than
* one byte, a feature-specific extension of the code will be required.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include "ccid.h"
#include "feat.h"
/* feature-specific sysctls - initialised to the defaults from RFC 4340, 6.4 */
unsigned long sysctl_dccp_sequence_window __read_mostly = 100;
int sysctl_dccp_rx_ccid __read_mostly =
