net/dccp/ccids/ccid2.h

   1 /*
   2  *  net/dccp/ccids/ccid2.h
   3  *
   4  *  Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 #ifndef _DCCP_CCID2_H_
  21 #define _DCCP_CCID2_H_
  22
  23 #include <linux/dccp.h>
  24 #include <linux/timer.h>
  25 #include <linux/types.h>
  26 #include "../ccid.h"
  27 /* NUMDUPACK parameter from RFC 4341, p. 6 */
  28 #define NUMDUPACK       3
  29
  30 struct sock;
  31
  32 struct ccid2_seq {
  33         u64                     ccid2s_seq;
  34         unsigned long           ccid2s_sent;
  35         int                     ccid2s_acked;
  36         struct ccid2_seq        *ccid2s_prev;
  37         struct ccid2_seq        *ccid2s_next;
  38 };
  39
  40 #define CCID2_SEQBUF_LEN 1024
  41 #define CCID2_SEQBUF_MAX 128
  42
  43 /** struct ccid2_hc_tx_sock - CCID2 TX half connection
  44  *
  45  * @ccid2hctx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
  46  * @ccid2hctx_packets_acked - Ack counter for deriving cwnd growth (RFC 3465)
  47  * @ccid2hctx_lastrtt -time RTT was last measured
  48  * @ccid2hctx_rpseq - last consecutive seqno
  49  * @ccid2hctx_rpdupack - dupacks since rpseq
  50 */
  51 struct ccid2_hc_tx_sock {
  52         u32                     ccid2hctx_cwnd;
  53         u32                     ccid2hctx_ssthresh;
  54         u32                     ccid2hctx_pipe;
  55         u32                     ccid2hctx_packets_acked;
  56         struct ccid2_seq        *ccid2hctx_seqbuf[CCID2_SEQBUF_MAX];
  57         int                     ccid2hctx_seqbufc;
  58         struct ccid2_seq        *ccid2hctx_seqh;
  59         struct ccid2_seq        *ccid2hctx_seqt;
  60         long                    ccid2hctx_rto;
  61         long                    ccid2hctx_srtt;
  62         long                    ccid2hctx_rttvar;
  63         unsigned long           ccid2hctx_lastrtt;
  64         struct timer_list       ccid2hctx_rtotimer;
  65         u64                     ccid2hctx_rpseq;
  66         int                     ccid2hctx_rpdupack;
  67         unsigned long           ccid2hctx_last_cong;
  68         u64                     ccid2hctx_high_ack;
  69 };
  70
  71 struct ccid2_hc_rx_sock {
  72         int     ccid2hcrx_data;
  73 };
  74
  75 static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
  76 {
  77         return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
  78 }
  79
  80 static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
  81 {
  82         return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
  83 }
  84 #endif /* _DCCP_CCID2_H_ */