packet_history.c

/*
 *  net/dccp/packet_history.h
 *
 *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
 *
 *  An implementation of the DCCP protocol
 *
 *  This code has been developed by the University of Waikato WAND
 *  research group. For further information please see http://www.wand.net.nz/
 *  or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
 *
 *  This code also uses code from Lulea University, rereleased as GPL by its
 *  authors:
 *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
 *
 *  Changes to meet Linux coding standards, to make it meet latest ccid3 draft
 *  and to make it work as a loadable module in the DCCP stack written by
 *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
 *
 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/config.h>
#include <linux/string.h>

#include "packet_history.h"

struct dccp_rx_hist *dccp_rx_hist_new(const char *name)
{
	struct dccp_rx_hist *hist = kmalloc(sizeof(*hist), GFP_ATOMIC);
	static const char dccp_rx_hist_mask[] = "rx_hist_%s";
	char *slab_name;

	if (hist == NULL)
		goto out;

	slab_name = kmalloc(strlen(name) + sizeof(dccp_rx_hist_mask) - 1,
			    GFP_ATOMIC);
	if (slab_name == NULL)
		goto out_free_hist;

	sprintf(slab_name, dccp_rx_hist_mask, name);
	hist->dccprxh_slab = kmem_cache_create(slab_name,
					       sizeof(struct dccp_rx_hist_entry),
					       0, SLAB_HWCACHE_ALIGN,
					       NULL, NULL);
	if (hist->dccprxh_slab == NULL)
		goto out_free_slab_name;
out:
	return hist;
out_free_slab_name:
	kfree(slab_name);
out_free_hist:
	kfree(hist);
	hist = NULL;
	goto out;
}

EXPORT_SYMBOL_GPL(dccp_rx_hist_new);

void dccp_rx_hist_delete(struct dccp_rx_hist *hist)
{
	const char* name = kmem_cache_name(hist->dccprxh_slab);

	kmem_cache_destroy(hist->dccprxh_slab);
	kfree(name);
	kfree(hist);
}

EXPORT_SYMBOL_GPL(dccp_rx_hist_delete);

void dccp_rx_hist_purge(struct dccp_rx_hist *hist, struct list_head *list)
{
	struct dccp_rx_hist_entry *entry, *next;

	list_for_each_entry_safe(entry, next, list, dccphrx_node) {
		list_del_init(&entry->dccphrx_node);
		kmem_cache_free(hist->dccprxh_slab, entry);
	}
}

EXPORT_SYMBOL_GPL(dccp_rx_hist_purge);

struct dccp_rx_hist_entry *
		dccp_rx_hist_find_data_packet(const struct list_head *list)
{
	struct dccp_rx_hist_entry *entry, *packet = NULL;

	list_for_each_entry(entry, list, dccphrx_node)
		if (entry->dccphrx_type == DCCP_PKT_DATA ||
		    entry->dccphrx_type == DCCP_PKT_DATAACK) {
			packet = entry;
			break;
		}

	return packet;
}

EXPORT_SYMBOL_GPL(dccp_rx_hist_find_data_packet);

struct dccp_tx_hist *dccp_tx_hist_new(const char *name)
{
	struct dccp_tx_hist *hist = kmalloc(sizeof(*hist), GFP_ATOMIC);
	static const char dccp_tx_hist_mask[] = "tx_hist_%s";
	char *slab_name;

	if (hist == NULL)
		goto out;

	slab_name = kmalloc(strlen(name) + sizeof(dccp_tx_hist_mask) - 1,
			    GFP_ATOMIC);
	if (slab_name == NULL)
		goto out_free_hist;

	sprintf(slab_name, dccp_tx_hist_mask, name);
	hist->dccptxh_slab = kmem_cache_create(slab_name,
					       sizeof(struct dccp_tx_hist_entry),
					       0, SLAB_HWCACHE_ALIGN,
					       NULL, NULL);
	if (hist->dccptxh_slab == NULL)
		goto out_free_slab_name;
out:
	return hist;
out_free_slab_name:
	kfree(slab_name);
out_free_hist:
	kfree(hist);
	hist = NULL;
	goto out;
}

EXPORT_SYMBOL_GPL(dccp_tx_hist_new);

void dccp_tx_hist_delete(struct dccp_tx_hist *hist)
{
	const char* name = kmem_cache_name(hist->dccptxh_slab);

	kmem_cache_destroy(hist->dccptxh_slab);
	kfree(name);
	kfree(hist);
}

EXPORT_SYMBOL_GPL(dccp_tx_hist_delete);

struct dccp_tx_hist_entry *dccp_tx_hist_find_entry(const struct list_head *list,
						   const u64 seq)
{
	struct dccp_tx_hist_entry *packet = NULL, *entry;

	list_for_each_entry(entry, list, dccphtx_node)
		if (entry->dccphtx_seqno == seq) {
			packet = entry;
			break;
		}

	return packet;
}

EXPORT_SYMBOL_GPL(dccp_tx_hist_find_entry);

void dccp_tx_hist_purge_older(struct dccp_tx_hist *hist, struct list_head *list,
			      struct dccp_tx_hist_entry *packet)
{
	struct dccp_tx_hist_entry *next;

	list_for_each_entry_safe_continue(packet, next, list, dccphtx_node) {
		list_del_init(&packet->dccphtx_node);
		dccp_tx_hist_entry_delete(hist, packet);
	}
}

EXPORT_SYMBOL_GPL(dccp_tx_hist_purge_older);

void dccp_tx_hist_purge(struct dccp_tx_hist *hist, struct list_head *list)
{
	struct dccp_tx_hist_entry *entry, *next;

	list_for_each_entry_safe(entry, next, list, dccphtx_node) {
		list_del_init(&entry->dccphtx_node);
		dccp_tx_hist_entry_delete(hist, entry);
	}
}

EXPORT_SYMBOL_GPL(dccp_tx_hist_purge);