mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
7e87fe8430
This patch replaces an almost identical replication of code: large parts
of dccp_parse_options() re-appeared as ccid2_ackvector() in ccid2.c.
Apart from the duplication, this caused two more problems:
1. CCIDs should not need to be concerned with parsing header options;
2. one can not assume that Ack Vectors appear as a contiguous area within an
skb, it is legal to insert other options and/or padding in between. The
current code would throw an error and stop reading in such a case.
Since Ack Vectors provide CCID-specific information, they are now processed
by the CCID directly, separating this functionality from the main DCCP code.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/*
|
|
* 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
|
|
|
|
/**
|
|
* 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_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;
|
|
|
|
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;
|
|
}
|
|
|
|
struct ccid2_hc_rx_sock {
|
|
int rx_data;
|
|
};
|
|
|
|
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_ */
|