packet_history.h revision b0e567806d16586629468c824dfb2e71155df7da 
1/*
2 *  net/dccp/packet_history.h
3 *
4 *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
5 *
6 *  An implementation of the DCCP protocol
7 *
8 *  This code has been developed by the University of Waikato WAND
9 *  research group. For further information please see http://www.wand.net.nz/
10 *  or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
11 *
12 *  This code also uses code from Lulea University, rereleased as GPL by its
13 *  authors:
14 *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
15 *
16 *  Changes to meet Linux coding standards, to make it meet latest ccid3 draft
17 *  and to make it work as a loadable module in the DCCP stack written by
18 *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
19 *
20 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
21 *
22 *  This program is free software; you can redistribute it and/or modify
23 *  it under the terms of the GNU General Public License as published by
24 *  the Free Software Foundation; either version 2 of the License, or
25 *  (at your option) any later version.
26 *
27 *  This program is distributed in the hope that it will be useful,
28 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
29 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
30 *  GNU General Public License for more details.
31 *
32 *  You should have received a copy of the GNU General Public License
33 *  along with this program; if not, write to the Free Software
34 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 */
36
37#ifndef _DCCP_PKT_HIST_
38#define _DCCP_PKT_HIST_
39
40#include <linux/config.h>
41#include <linux/list.h>
42#include <linux/slab.h>
43#include <linux/time.h>
44
45#include "../../dccp.h"
46
47/* Number of later packets received before one is considered lost */
48#define TFRC_RECV_NUM_LATE_LOSS	 3
49
50#define TFRC_WIN_COUNT_PER_RTT	 4
51#define TFRC_WIN_COUNT_LIMIT	16
52
53struct dccp_tx_hist_entry {
54	struct list_head dccphtx_node;
55	u64		 dccphtx_seqno:48,
56			 dccphtx_ccval:4,
57			 dccphtx_sent:1;
58	u32		 dccphtx_rtt;
59	struct timeval	 dccphtx_tstamp;
60};
61
62struct dccp_rx_hist_entry {
63	struct list_head dccphrx_node;
64	u64		 dccphrx_seqno:48,
65			 dccphrx_ccval:4,
66			 dccphrx_type:4;
67	u32		 dccphrx_ndp; /* In fact it is from 8 to 24 bits */
68	struct timeval	 dccphrx_tstamp;
69};
70
71struct dccp_tx_hist {
72	kmem_cache_t *dccptxh_slab;
73};
74
75extern struct dccp_tx_hist *dccp_tx_hist_new(const char *name);
76extern void dccp_tx_hist_delete(struct dccp_tx_hist *hist);
77
78struct dccp_rx_hist {
79	kmem_cache_t *dccprxh_slab;
80};
81
82extern struct dccp_rx_hist *dccp_rx_hist_new(const char *name);
83extern void dccp_rx_hist_delete(struct dccp_rx_hist *hist);
84extern struct dccp_rx_hist_entry *
85		dccp_rx_hist_find_data_packet(const struct list_head *list);
86
87static inline struct dccp_tx_hist_entry *
88		dccp_tx_hist_entry_new(struct dccp_tx_hist *hist,
89				       const unsigned int __nocast prio)
90{
91	struct dccp_tx_hist_entry *entry = kmem_cache_alloc(hist->dccptxh_slab,
92							    prio);
93
94	if (entry != NULL)
95		entry->dccphtx_sent = 0;
96
97	return entry;
98}
99
100static inline void dccp_tx_hist_entry_delete(struct dccp_tx_hist *hist,
101					     struct dccp_tx_hist_entry *entry)
102{
103	if (entry != NULL)
104		kmem_cache_free(hist->dccptxh_slab, entry);
105}
106
107extern struct dccp_tx_hist_entry *
108			dccp_tx_hist_find_entry(const struct list_head *list,
109						const u64 seq);
110
111static inline void dccp_tx_hist_add_entry(struct list_head *list,
112					  struct dccp_tx_hist_entry *entry)
113{
114	list_add(&entry->dccphtx_node, list);
115}
116
117extern void dccp_tx_hist_purge_older(struct dccp_tx_hist *hist,
118				     struct list_head *list,
119				     struct dccp_tx_hist_entry *next);
120
121extern void dccp_tx_hist_purge(struct dccp_tx_hist *hist,
122			       struct list_head *list);
123
124static inline struct dccp_tx_hist_entry *
125		dccp_tx_hist_head(struct list_head *list)
126{
127	struct dccp_tx_hist_entry *head = NULL;
128
129	if (!list_empty(list))
130		head = list_entry(list->next, struct dccp_tx_hist_entry,
131				  dccphtx_node);
132	return head;
133}
134
135static inline struct dccp_rx_hist_entry *
136		     dccp_rx_hist_entry_new(struct dccp_rx_hist *hist,
137				     	    const struct sock *sk,
138				     	    const u32 ndp,
139					    const struct sk_buff *skb,
140					    const unsigned int __nocast prio)
141{
142	struct dccp_rx_hist_entry *entry = kmem_cache_alloc(hist->dccprxh_slab,
143							    prio);
144
145	if (entry != NULL) {
146		const struct dccp_hdr *dh = dccp_hdr(skb);
147
148		entry->dccphrx_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
149		entry->dccphrx_ccval = dh->dccph_ccval;
150		entry->dccphrx_type  = dh->dccph_type;
151		entry->dccphrx_ndp   = ndp;
152		dccp_timestamp(sk, &entry->dccphrx_tstamp);
153	}
154
155	return entry;
156}
157
158static inline void dccp_rx_hist_entry_delete(struct dccp_rx_hist *hist,
159					     struct dccp_rx_hist_entry *entry)
160{
161	if (entry != NULL)
162		kmem_cache_free(hist->dccprxh_slab, entry);
163}
164
165extern void dccp_rx_hist_purge(struct dccp_rx_hist *hist,
166			       struct list_head *list);
167
168static inline void dccp_rx_hist_add_entry(struct list_head *list,
169					  struct dccp_rx_hist_entry *entry)
170{
171	list_add(&entry->dccphrx_node, list);
172}
173
174static inline struct dccp_rx_hist_entry *
175		dccp_rx_hist_head(struct list_head *list)
176{
177	struct dccp_rx_hist_entry *head = NULL;
178
179	if (!list_empty(list))
180		head = list_entry(list->next, struct dccp_rx_hist_entry,
181				  dccphrx_node);
182	return head;
183}
184
185static inline int
186	dccp_rx_hist_entry_data_packet(const struct dccp_rx_hist_entry *entry)
187{
188	return entry->dccphrx_type == DCCP_PKT_DATA ||
189	       entry->dccphrx_type == DCCP_PKT_DATAACK;
190}
191
192extern int dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
193				   struct list_head *rx_list,
194				   struct list_head *li_list,
195				   struct dccp_rx_hist_entry *packet);
196
197extern u64 dccp_rx_hist_detect_loss(struct list_head *rx_list,
198				    struct list_head *li_list, u8 *win_loss);
199
200#endif /* _DCCP_PKT_HIST_ */
201