| /* |
| * Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| #ifndef _DCCP_CCID2_H_ |
| #define _DCCP_CCID2_H_ |
| |
| #include <linux/timer.h> |
| #include <linux/types.h> |
| #include "../ccid.h" |
| #include "../dccp.h" |
| |
| /* |
| * CCID-2 timestamping faces the same issues as TCP timestamping. |
| * Hence we reuse/share as much of the code as possible. |
| */ |
| #define ccid2_time_stamp tcp_time_stamp |
| |
| /* NUMDUPACK parameter from RFC 4341, p. 6 */ |
| #define NUMDUPACK 3 |
| |
| struct ccid2_seq { |
| u64 ccid2s_seq; |
| u32 ccid2s_sent; |
| int ccid2s_acked; |
| struct ccid2_seq *ccid2s_prev; |
| struct ccid2_seq *ccid2s_next; |
| }; |
| |
| #define CCID2_SEQBUF_LEN 1024 |
| #define CCID2_SEQBUF_MAX 128 |
| |
| /* |
| * Multiple of congestion window to keep the sequence window at |
| * (RFC 4340 7.5.2) |
| */ |
| #define CCID2_WIN_CHANGE_FACTOR 5 |
| |
| /** |
| * struct ccid2_hc_tx_sock - CCID2 TX half connection |
| * @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5 |
| * @tx_packets_acked: Ack counter for deriving cwnd growth (RFC 3465) |
| * @tx_srtt: smoothed RTT estimate, scaled by 2^3 |
| * @tx_mdev: smoothed RTT variation, scaled by 2^2 |
| * @tx_mdev_max: maximum of @mdev during one flight |
| * @tx_rttvar: moving average/maximum of @mdev_max |
| * @tx_rto: RTO value deriving from SRTT and RTTVAR (RFC 2988) |
| * @tx_rtt_seq: to decay RTTVAR at most once per flight |
| * @tx_cwnd_used: actually used cwnd, W_used of RFC 2861 |
| * @tx_expected_wnd: moving average of @tx_cwnd_used |
| * @tx_cwnd_stamp: to track idle periods in CWV |
| * @tx_lsndtime: last time (in jiffies) a data packet was sent |
| * @tx_rpseq: last consecutive seqno |
| * @tx_rpdupack: dupacks since rpseq |
| * @tx_av_chunks: list of Ack Vectors received on current skb |
| */ |
| struct ccid2_hc_tx_sock { |
| u32 tx_cwnd; |
| u32 tx_ssthresh; |
| u32 tx_pipe; |
| u32 tx_packets_acked; |
| struct ccid2_seq *tx_seqbuf[CCID2_SEQBUF_MAX]; |
| int tx_seqbufc; |
| struct ccid2_seq *tx_seqh; |
| struct ccid2_seq *tx_seqt; |
| |
| /* RTT measurement: variables/principles are the same as in TCP */ |
| u32 tx_srtt, |
| tx_mdev, |
| tx_mdev_max, |
| tx_rttvar, |
| tx_rto; |
| u64 tx_rtt_seq:48; |
| struct timer_list tx_rtotimer; |
| |
| /* Congestion Window validation (optional, RFC 2861) */ |
| u32 tx_cwnd_used, |
| tx_expected_wnd, |
| tx_cwnd_stamp, |
| tx_lsndtime; |
| |
| u64 tx_rpseq; |
| int tx_rpdupack; |
| u32 tx_last_cong; |
| u64 tx_high_ack; |
| struct list_head tx_av_chunks; |
| }; |
| |
| static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc) |
| { |
| return hc->tx_pipe >= hc->tx_cwnd; |
| } |
| |
| /* |
| * Convert RFC 3390 larger initial window into an equivalent number of packets. |
| * This is based on the numbers specified in RFC 5681, 3.1. |
| */ |
| static inline u32 rfc3390_bytes_to_packets(const u32 smss) |
| { |
| return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3); |
| } |
| |
| /** |
| * struct ccid2_hc_rx_sock - Receiving end of CCID-2 half-connection |
| * @rx_num_data_pkts: number of data packets received since last feedback |
| */ |
| struct ccid2_hc_rx_sock { |
| u32 rx_num_data_pkts; |
| }; |
| |
| static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk) |
| { |
| return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid); |
| } |
| |
| static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk) |
| { |
| return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid); |
| } |
| #endif /* _DCCP_CCID2_H_ */ |