2 * net/dccp/ccids/ccid2.h
4 * Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
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.
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.
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.
20 #ifndef _DCCP_CCID2_H_
21 #define _DCCP_CCID2_H_
23 #include <linux/dccp.h>
24 #include <linux/timer.h>
25 #include <linux/types.h>
27 /* NUMDUPACK parameter from RFC 4341, p. 6 */
34 unsigned long ccid2s_sent;
36 struct ccid2_seq *ccid2s_prev;
37 struct ccid2_seq *ccid2s_next;
40 #define CCID2_SEQBUF_LEN 1024
41 #define CCID2_SEQBUF_MAX 128
43 /** struct ccid2_hc_tx_sock - CCID2 TX half connection
45 * @{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
46 * @packets_acked: Ack counter for deriving cwnd growth (RFC 3465)
47 * @srtt: smoothed RTT estimate, scaled by 2^3
48 * @mdev: smoothed RTT variation, scaled by 2^2
49 * @mdev_max: maximum of @mdev during one flight
50 * @rttvar: moving average/maximum of @mdev_max
51 * @rto: RTO value deriving from SRTT and RTTVAR (RFC 2988)
52 * @rtt_seq: to decay RTTVAR at most once per flight
53 * @rpseq: last consecutive seqno
54 * @rpdupack: dupacks since rpseq
55 * @av_chunks: list of Ack Vectors received on current skb
57 struct ccid2_hc_tx_sock {
62 struct ccid2_seq *seqbuf[CCID2_SEQBUF_MAX];
64 struct ccid2_seq *seqh;
65 struct ccid2_seq *seqt;
66 /* RTT measurement: variables/principles are the same as in TCP */
73 struct timer_list rtotimer;
76 unsigned long last_cong;
78 struct list_head av_chunks;
81 static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hctx)
83 return (hctx->pipe >= hctx->cwnd);
86 struct ccid2_hc_rx_sock {
90 static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
92 return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
95 static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
97 return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
99 #endif /* _DCCP_CCID2_H_ */