net/dccp/ccids/ccid2.h

   1 /*
   2  *  Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18 #ifndef _DCCP_CCID2_H_
  19 #define _DCCP_CCID2_H_
  20
  21 #include <linux/dccp.h>
  22 #include <linux/timer.h>
  23 #include <linux/types.h>
  24 #include "../ccid.h"
  25 /* NUMDUPACK parameter from RFC 4341, p. 6 */
  26 #define NUMDUPACK       3
  27
  28 struct sock;
  29
  30 struct ccid2_seq {
  31         u64                     ccid2s_seq;
  32         unsigned long           ccid2s_sent;
  33         int                     ccid2s_acked;
  34         struct ccid2_seq        *ccid2s_prev;
  35         struct ccid2_seq        *ccid2s_next;
  36 };
  37
  38 #define CCID2_SEQBUF_LEN 1024
  39 #define CCID2_SEQBUF_MAX 128
  40
  41 /**
  42  * struct ccid2_hc_tx_sock - CCID2 TX half connection
  43  * @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
  44  * @tx_packets_acked:        Ack counter for deriving cwnd growth (RFC 3465)
  45  * @tx_lastrtt:              time RTT was last measured
  46  * @tx_rpseq:                last consecutive seqno
  47  * @tx_rpdupack:             dupacks since rpseq
  48  */
  49 struct ccid2_hc_tx_sock {
  50         u32                     tx_cwnd;
  51         u32                     tx_ssthresh;
  52         u32                     tx_pipe;
  53         u32                     tx_packets_acked;
  54         struct ccid2_seq        *tx_seqbuf[CCID2_SEQBUF_MAX];
  55         int                     tx_seqbufc;
  56         struct ccid2_seq        *tx_seqh;
  57         struct ccid2_seq        *tx_seqt;
  58         long                    tx_rto;
  59         long                    tx_srtt;
  60         long                    tx_rttvar;
  61         unsigned long           tx_lastrtt;
  62         struct timer_list       tx_rtotimer;
  63         u64                     tx_rpseq;
  64         int                     tx_rpdupack;
  65         unsigned long           tx_last_cong;
  66         u64                     tx_high_ack;
  67 };
  68
  69 struct ccid2_hc_rx_sock {
  70         int     rx_data;
  71 };
  72
  73 static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
  74 {
  75         return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
  76 }
  77
  78 static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
  79 {
  80         return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
  81 }
  82 #endif /* _DCCP_CCID2_H_ */