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/timer.h> 22 #include <linux/types.h> 23 #include "../ccid.h" 24 #include "../dccp.h" 25 26 /* 27 * CCID-2 timestamping faces the same issues as TCP timestamping. 28 * Hence we reuse/share as much of the code as possible. 29 */ 30 #define ccid2_time_stamp tcp_time_stamp 31 32 /* NUMDUPACK parameter from RFC 4341, p. 6 */ 33 #define NUMDUPACK 3 34 35 struct ccid2_seq { 36 u64 ccid2s_seq; 37 u32 ccid2s_sent; 38 int ccid2s_acked; 39 struct ccid2_seq *ccid2s_prev; 40 struct ccid2_seq *ccid2s_next; 41 }; 42 43 #define CCID2_SEQBUF_LEN 1024 44 #define CCID2_SEQBUF_MAX 128 45 46 /** 47 * struct ccid2_hc_tx_sock - CCID2 TX half connection 48 * @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5 49 * @tx_packets_acked: Ack counter for deriving cwnd growth (RFC 3465) 50 * @tx_srtt: smoothed RTT estimate, scaled by 2^3 51 * @tx_mdev: smoothed RTT variation, scaled by 2^2 52 * @tx_mdev_max: maximum of @mdev during one flight 53 * @tx_rttvar: moving average/maximum of @mdev_max 54 * @tx_rto: RTO value deriving from SRTT and RTTVAR (RFC 2988) 55 * @tx_rtt_seq: to decay RTTVAR at most once per flight 56 * @tx_rpseq: last consecutive seqno 57 * @tx_rpdupack: dupacks since rpseq 58 * @tx_av_chunks: list of Ack Vectors received on current skb 59 */ 60 struct ccid2_hc_tx_sock { 61 u32 tx_cwnd; 62 u32 tx_ssthresh; 63 u32 tx_pipe; 64 u32 tx_packets_acked; 65 struct ccid2_seq *tx_seqbuf[CCID2_SEQBUF_MAX]; 66 int tx_seqbufc; 67 struct ccid2_seq *tx_seqh; 68 struct ccid2_seq *tx_seqt; 69 70 /* RTT measurement: variables/principles are the same as in TCP */ 71 u32 tx_srtt, 72 tx_mdev, 73 tx_mdev_max, 74 tx_rttvar, 75 tx_rto; 76 u64 tx_rtt_seq:48; 77 struct timer_list tx_rtotimer; 78 79 u64 tx_rpseq; 80 int tx_rpdupack; 81 u32 tx_last_cong; 82 u64 tx_high_ack; 83 struct list_head tx_av_chunks; 84 }; 85 86 static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc) 87 { 88 return hc->tx_pipe >= hc->tx_cwnd; 89 } 90 91 struct ccid2_hc_rx_sock { 92 int rx_data; 93 }; 94 95 static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk) 96 { 97 return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid); 98 } 99 100 static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk) 101 { 102 return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid); 103 } 104 #endif /* _DCCP_CCID2_H_ */ 105