net/dccp/ccids/lib/packet_history.h

   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
  53 struct 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
  62 struct 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
  71 struct dccp_tx_hist {
  72         kmem_cache_t *dccptxh_slab;
  73 };
  74
  75 extern struct dccp_tx_hist *dccp_tx_hist_new(const char *name);
  76 extern void dccp_tx_hist_delete(struct dccp_tx_hist *hist);
  77
  78 struct dccp_rx_hist {
  79         kmem_cache_t *dccprxh_slab;
  80 };
  81
  82 extern struct dccp_rx_hist *dccp_rx_hist_new(const char *name);
  83 extern void dccp_rx_hist_delete(struct dccp_rx_hist *hist);
  84 extern struct dccp_rx_hist_entry *
  85                 dccp_rx_hist_find_data_packet(const struct list_head *list);
  86
  87 static inline struct dccp_tx_hist_entry *
  88                 dccp_tx_hist_entry_new(struct dccp_tx_hist *hist,
  89                                        const gfp_t 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
 100 static 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
 107 extern struct dccp_tx_hist_entry *
 108                         dccp_tx_hist_find_entry(const struct list_head *list,
 109                                                 const u64 seq);
 110
 111 static 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
 117 extern void dccp_tx_hist_purge_older(struct dccp_tx_hist *hist,
 118                                      struct list_head *list,
 119                                      struct dccp_tx_hist_entry *next);
 120
 121 extern void dccp_tx_hist_purge(struct dccp_tx_hist *hist,
 122                                struct list_head *list);
 123
 124 static 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
 135 static 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 gfp_t 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
 158 static 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
 165 extern void dccp_rx_hist_purge(struct dccp_rx_hist *hist,
 166                                struct list_head *list);
 167
 168 static 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
 174 static 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
 185 static 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
 192 extern 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
 197 extern 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_ */