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   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 struct dccp_tx_hist_entry {
  48         struct list_head dccphtx_node;
  49         u64              dccphtx_seqno:48,
  50                          dccphtx_ccval:4,
  51                          dccphtx_sent:1;
  52         u32              dccphtx_rtt;
  53         struct timeval   dccphtx_tstamp;
  54 };
  55
  56 struct dccp_rx_hist_entry {
  57         struct list_head dccphrx_node;
  58         u64              dccphrx_seqno:48,
  59                          dccphrx_ccval:4,
  60                          dccphrx_type:4;
  61         u32              dccphrx_ndp; /* In fact it is from 8 to 24 bits */
  62         struct timeval   dccphrx_tstamp;
  63 };
  64
  65 struct dccp_tx_hist {
  66         kmem_cache_t *dccptxh_slab;
  67 };
  68
  69 extern struct dccp_tx_hist *dccp_tx_hist_new(const char *name);
  70 extern void dccp_tx_hist_delete(struct dccp_tx_hist *hist);
  71
  72 struct dccp_rx_hist {
  73         kmem_cache_t *dccprxh_slab;
  74 };
  75
  76 extern struct dccp_rx_hist *dccp_rx_hist_new(const char *name);
  77 extern void dccp_rx_hist_delete(struct dccp_rx_hist *hist);
  78 extern struct dccp_rx_hist_entry *
  79                 dccp_rx_hist_find_data_packet(const struct list_head *list);
  80
  81 static inline struct dccp_tx_hist_entry *
  82                         dccp_tx_hist_entry_new(struct dccp_tx_hist *hist,
  83                                                const int prio)
  84 {
  85         struct dccp_tx_hist_entry *entry = kmem_cache_alloc(hist->dccptxh_slab,
  86                                                             prio);
  87
  88         if (entry != NULL)
  89                 entry->dccphtx_sent = 0;
  90
  91         return entry;
  92 }
  93
  94 static inline void dccp_tx_hist_entry_delete(struct dccp_tx_hist *hist,
  95                                              struct dccp_tx_hist_entry *entry)
  96 {
  97         if (entry != NULL)
  98                 kmem_cache_free(hist->dccptxh_slab, entry);
  99 }
 100
 101 extern struct dccp_tx_hist_entry *
 102                         dccp_tx_hist_find_entry(const struct list_head *list,
 103                                                 const u64 seq);
 104
 105 static inline void dccp_tx_hist_add_entry(struct list_head *list,
 106                                           struct dccp_tx_hist_entry *entry)
 107 {
 108         list_add(&entry->dccphtx_node, list);
 109 }
 110
 111 extern void dccp_tx_hist_purge_older(struct dccp_tx_hist *hist,
 112                                      struct list_head *list,
 113                                      struct dccp_tx_hist_entry *next);
 114
 115 extern void dccp_tx_hist_purge(struct dccp_tx_hist *hist,
 116                                struct list_head *list);
 117
 118 static inline struct dccp_tx_hist_entry *dccp_tx_hist_head(struct list_head *list)
 119 {
 120         struct dccp_tx_hist_entry *head = NULL;
 121
 122         if (!list_empty(list))
 123                 head = list_entry(list->next, struct dccp_tx_hist_entry,
 124                                   dccphtx_node);
 125         return head;
 126 }
 127
 128 static inline struct dccp_rx_hist_entry *
 129                              dccp_rx_hist_entry_new(struct dccp_rx_hist *hist,
 130                                                     const u32 ndp,
 131                                                     const struct sk_buff *skb,
 132                                                     const int prio)
 133 {
 134         struct dccp_rx_hist_entry *entry = kmem_cache_alloc(hist->dccprxh_slab,
 135                                                             prio);
 136
 137         if (entry != NULL) {
 138                 const struct dccp_hdr *dh = dccp_hdr(skb);
 139
 140                 entry->dccphrx_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
 141                 entry->dccphrx_ccval = dh->dccph_ccval;
 142                 entry->dccphrx_type  = dh->dccph_type;
 143                 entry->dccphrx_ndp   = ndp;
 144                 do_gettimeofday(&(entry->dccphrx_tstamp));
 145         }
 146
 147         return entry;
 148 }
 149
 150 static inline void dccp_rx_hist_entry_delete(struct dccp_rx_hist *hist,
 151                                              struct dccp_rx_hist_entry *entry)
 152 {
 153         if (entry != NULL)
 154                 kmem_cache_free(hist->dccprxh_slab, entry);
 155 }
 156
 157 extern void dccp_rx_hist_purge(struct dccp_rx_hist *hist,
 158                                struct list_head *list);
 159
 160 static inline void dccp_rx_hist_add_entry(struct list_head *list,
 161                                           struct dccp_rx_hist_entry *entry)
 162 {
 163         list_add(&entry->dccphrx_node, list);
 164 }
 165
 166 static inline struct dccp_rx_hist_entry *dccp_rx_hist_head(struct list_head *list)
 167 {
 168         struct dccp_rx_hist_entry *head = NULL;
 169
 170         if (!list_empty(list))
 171                 head = list_entry(list->next, struct dccp_rx_hist_entry,
 172                                   dccphrx_node);
 173         return head;
 174 }
 175
 176 static inline int
 177         dccp_rx_hist_entry_data_packet(const struct dccp_rx_hist_entry *entry)
 178 {
 179         return entry->dccphrx_type == DCCP_PKT_DATA ||
 180                entry->dccphrx_type == DCCP_PKT_DATAACK;
 181 }
 182
 183 #endif /* _DCCP_PKT_HIST_ */