cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ccid2.h (3336B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 *  Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
      4 */
      5#ifndef _DCCP_CCID2_H_
      6#define _DCCP_CCID2_H_
      7
      8#include <linux/timer.h>
      9#include <linux/types.h>
     10#include "../ccid.h"
     11#include "../dccp.h"
     12
     13/*
     14 * CCID-2 timestamping faces the same issues as TCP timestamping.
     15 * Hence we reuse/share as much of the code as possible.
     16 */
     17#define ccid2_jiffies32	((u32)jiffies)
     18
     19/* NUMDUPACK parameter from RFC 4341, p. 6 */
     20#define NUMDUPACK	3
     21
     22struct ccid2_seq {
     23	u64			ccid2s_seq;
     24	u32			ccid2s_sent;
     25	int			ccid2s_acked;
     26	struct ccid2_seq	*ccid2s_prev;
     27	struct ccid2_seq	*ccid2s_next;
     28};
     29
     30#define CCID2_SEQBUF_LEN 1024
     31#define CCID2_SEQBUF_MAX 128
     32
     33/*
     34 * Multiple of congestion window to keep the sequence window at
     35 * (RFC 4340 7.5.2)
     36 */
     37#define CCID2_WIN_CHANGE_FACTOR 5
     38
     39/**
     40 * struct ccid2_hc_tx_sock - CCID2 TX half connection
     41 * @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
     42 * @tx_packets_acked:	     Ack counter for deriving cwnd growth (RFC 3465)
     43 * @tx_srtt:		     smoothed RTT estimate, scaled by 2^3
     44 * @tx_mdev:		     smoothed RTT variation, scaled by 2^2
     45 * @tx_mdev_max:	     maximum of @mdev during one flight
     46 * @tx_rttvar:		     moving average/maximum of @mdev_max
     47 * @tx_rto:		     RTO value deriving from SRTT and RTTVAR (RFC 2988)
     48 * @tx_rtt_seq:		     to decay RTTVAR at most once per flight
     49 * @tx_cwnd_used:	     actually used cwnd, W_used of RFC 2861
     50 * @tx_expected_wnd:	     moving average of @tx_cwnd_used
     51 * @tx_cwnd_stamp:	     to track idle periods in CWV
     52 * @tx_lsndtime:	     last time (in jiffies) a data packet was sent
     53 * @tx_rpseq:		     last consecutive seqno
     54 * @tx_rpdupack:	     dupacks since rpseq
     55 * @tx_av_chunks:	     list of Ack Vectors received on current skb
     56 */
     57struct ccid2_hc_tx_sock {
     58	u32			tx_cwnd;
     59	u32			tx_ssthresh;
     60	u32			tx_pipe;
     61	u32			tx_packets_acked;
     62	struct ccid2_seq	*tx_seqbuf[CCID2_SEQBUF_MAX];
     63	int			tx_seqbufc;
     64	struct ccid2_seq	*tx_seqh;
     65	struct ccid2_seq	*tx_seqt;
     66
     67	/* RTT measurement: variables/principles are the same as in TCP */
     68	u32			tx_srtt,
     69				tx_mdev,
     70				tx_mdev_max,
     71				tx_rttvar,
     72				tx_rto;
     73	u64			tx_rtt_seq:48;
     74	struct timer_list	tx_rtotimer;
     75	struct sock		*sk;
     76
     77	/* Congestion Window validation (optional, RFC 2861) */
     78	u32			tx_cwnd_used,
     79				tx_expected_wnd,
     80				tx_cwnd_stamp,
     81				tx_lsndtime;
     82
     83	u64			tx_rpseq;
     84	int			tx_rpdupack;
     85	u32			tx_last_cong;
     86	u64			tx_high_ack;
     87	struct list_head	tx_av_chunks;
     88};
     89
     90static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc)
     91{
     92	return hc->tx_pipe >= hc->tx_cwnd;
     93}
     94
     95/*
     96 * Convert RFC 3390 larger initial window into an equivalent number of packets.
     97 * This is based on the numbers specified in RFC 5681, 3.1.
     98 */
     99static inline u32 rfc3390_bytes_to_packets(const u32 smss)
    100{
    101	return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3);
    102}
    103
    104/**
    105 * struct ccid2_hc_rx_sock  -  Receiving end of CCID-2 half-connection
    106 * @rx_num_data_pkts: number of data packets received since last feedback
    107 */
    108struct ccid2_hc_rx_sock {
    109	u32	rx_num_data_pkts;
    110};
    111
    112static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
    113{
    114	return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
    115}
    116
    117static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
    118{
    119	return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
    120}
    121#endif /* _DCCP_CCID2_H_ */