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62ce18fc9a
Currently when the peer collapses its rwnd, we mark packets to be retransmitted and use the must_retran flags like we do when a PMTU collapses to retransmit the collapsed packets. However this causes a problem with some middle boxes that play with the rwnd to control flow. As soon as the rwnd increases we start resending which may be not even a rtt.. and in fact the peer may have gotten the packets. Which means we gratuitously retransmit packets we should not. The fix here is to make sure that a rack time has passed before retransmitting the packets. This makes sure that the rwnd collapse was real and the packets do need retransmission. Reviewed by: tuexen Sponsored by: Netflix Inc Differential Revision: https://reviews.freebsd.org/D35166
393 lines
15 KiB
C
393 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2016-2018 Netflix, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __tcp_log_buf_h__
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#define __tcp_log_buf_h__
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#define TCP_LOG_REASON_LEN 32
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#define TCP_LOG_TAG_LEN 32
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#define TCP_LOG_BUF_VER (9)
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/*
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* Because the (struct tcp_log_buffer) includes 8-byte uint64_t's, it requires
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* 8-byte alignment to work properly on all platforms. Therefore, we will
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* enforce 8-byte alignment for all the structures that may appear by
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* themselves (instead of being embedded in another structure) in a data
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* stream.
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*/
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#define ALIGN_TCP_LOG __aligned(8)
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/* Information about the socketbuffer state. */
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struct tcp_log_sockbuf
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{
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uint32_t tls_sb_acc; /* available chars (sb->sb_acc) */
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uint32_t tls_sb_ccc; /* claimed chars (sb->sb_ccc) */
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uint32_t tls_sb_spare; /* spare */
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};
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/* Optional, verbose information that may be appended to an event log. */
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struct tcp_log_verbose
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{
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#define TCP_FUNC_LEN 32
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char tlv_snd_frm[TCP_FUNC_LEN]; /* tcp_output() caller */
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char tlv_trace_func[TCP_FUNC_LEN]; /* Function that
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generated trace */
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uint32_t tlv_trace_line; /* Line number that generated trace */
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uint8_t _pad[4];
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} ALIGN_TCP_LOG;
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/* Internal RACK state variables. */
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struct tcp_log_rack
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{
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uint32_t tlr_rack_rtt; /* rc_rack_rtt */
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uint8_t tlr_state; /* Internal RACK state */
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uint8_t _pad[3]; /* Padding */
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};
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struct tcp_log_bbr {
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uint64_t cur_del_rate;
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uint64_t delRate;
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uint64_t rttProp;
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uint64_t bw_inuse;
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uint32_t inflight;
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uint32_t applimited;
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uint32_t delivered;
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uint32_t timeStamp;
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uint32_t epoch;
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uint32_t lt_epoch;
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uint32_t pkts_out;
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uint32_t flex1;
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uint32_t flex2;
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uint32_t flex3;
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uint32_t flex4;
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uint32_t flex5;
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uint32_t flex6;
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uint32_t lost;
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uint16_t pacing_gain;
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uint16_t cwnd_gain;
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uint16_t flex7;
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uint8_t bbr_state;
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uint8_t bbr_substate;
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uint8_t inhpts;
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uint8_t __spare;
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uint8_t use_lt_bw;
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uint8_t flex8;
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uint32_t pkt_epoch;
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};
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/* Per-stack stack-specific info. */
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union tcp_log_stackspecific
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{
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struct tcp_log_rack u_rack;
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struct tcp_log_bbr u_bbr;
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};
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struct tcp_log_buffer
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{
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/* Event basics */
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struct timeval tlb_tv; /* Timestamp of trace */
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uint32_t tlb_ticks; /* Timestamp of trace */
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uint32_t tlb_sn; /* Serial number */
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uint8_t tlb_stackid; /* Stack ID */
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uint8_t tlb_eventid; /* Event ID */
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uint16_t tlb_eventflags; /* Flags for the record */
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#define TLB_FLAG_RXBUF 0x0001 /* Includes receive buffer info */
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#define TLB_FLAG_TXBUF 0x0002 /* Includes send buffer info */
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#define TLB_FLAG_HDR 0x0004 /* Includes a TCP header */
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#define TLB_FLAG_VERBOSE 0x0008 /* Includes function/line numbers */
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#define TLB_FLAG_STACKINFO 0x0010 /* Includes stack-specific info */
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int tlb_errno; /* Event error (if any) */
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/* Internal session state */
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struct tcp_log_sockbuf tlb_rxbuf; /* Receive buffer */
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struct tcp_log_sockbuf tlb_txbuf; /* Send buffer */
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int tlb_state; /* TCPCB t_state */
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uint32_t tlb_starttime; /* TCPCB t_starttime */
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uint32_t tlb_iss; /* TCPCB iss */
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uint32_t tlb_flags; /* TCPCB flags */
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uint32_t tlb_snd_una; /* TCPCB snd_una */
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uint32_t tlb_snd_max; /* TCPCB snd_max */
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uint32_t tlb_snd_cwnd; /* TCPCB snd_cwnd */
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uint32_t tlb_snd_nxt; /* TCPCB snd_nxt */
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uint32_t tlb_snd_recover;/* TCPCB snd_recover */
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uint32_t tlb_snd_wnd; /* TCPCB snd_wnd */
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uint32_t tlb_snd_ssthresh; /* TCPCB snd_ssthresh */
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uint32_t tlb_srtt; /* TCPCB t_srtt */
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uint32_t tlb_rttvar; /* TCPCB t_rttvar */
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uint32_t tlb_rcv_up; /* TCPCB rcv_up */
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uint32_t tlb_rcv_adv; /* TCPCB rcv_adv */
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uint32_t tlb_flags2; /* TCPCB t_flags2 */
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uint32_t tlb_rcv_nxt; /* TCPCB rcv_nxt */
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uint32_t tlb_rcv_wnd; /* TCPCB rcv_wnd */
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uint32_t tlb_dupacks; /* TCPCB t_dupacks */
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int tlb_segqlen; /* TCPCB segqlen */
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int tlb_snd_numholes; /* TCPCB snd_numholes */
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uint32_t tlb_flex1; /* Event specific information */
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uint32_t tlb_flex2; /* Event specific information */
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uint32_t tlb_fbyte_in; /* TCPCB first byte in time */
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uint32_t tlb_fbyte_out; /* TCPCB first byte out time */
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uint8_t tlb_snd_scale:4, /* TCPCB snd_scale */
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tlb_rcv_scale:4; /* TCPCB rcv_scale */
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uint8_t _pad[3]; /* Padding */
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/* Per-stack info */
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union tcp_log_stackspecific tlb_stackinfo;
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#define tlb_rack tlb_stackinfo.u_rack
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/* The packet */
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uint32_t tlb_len; /* The packet's data length */
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struct tcphdr tlb_th; /* The TCP header */
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uint8_t tlb_opts[TCP_MAXOLEN]; /* The TCP options */
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/* Verbose information (optional) */
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struct tcp_log_verbose tlb_verbose[0];
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} ALIGN_TCP_LOG;
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enum tcp_log_events {
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TCP_LOG_IN = 1, /* Incoming packet 1 */
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TCP_LOG_OUT, /* Transmit (without other event) 2 */
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TCP_LOG_RTO, /* Retransmit timeout 3 */
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TCP_LOG_SB_WAKE, /* Awaken socket buffer 4 */
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TCP_LOG_BAD_RETRAN, /* Detected bad retransmission 5 */
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TCP_LOG_PRR, /* Doing PRR 6 */
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TCP_LOG_REORDER, /* Detected reorder 7 */
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TCP_LOG_HPTS, /* Hpts sending a packet 8 */
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BBR_LOG_BBRUPD, /* We updated BBR info 9 */
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BBR_LOG_BBRSND, /* We did a slot calculation and sending is done 10 */
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BBR_LOG_ACKCLEAR, /* A ack clears all outstanding 11 */
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BBR_LOG_INQUEUE, /* The tcb had a packet input to it 12 */
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BBR_LOG_TIMERSTAR, /* Start a timer 13 */
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BBR_LOG_TIMERCANC, /* Cancel a timer 14 */
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BBR_LOG_ENTREC, /* Entered recovery 15 */
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BBR_LOG_EXITREC, /* Exited recovery 16 */
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BBR_LOG_CWND, /* Cwnd change 17 */
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BBR_LOG_BWSAMP, /* LT B/W sample has been made 18 */
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BBR_LOG_MSGSIZE, /* We received a EMSGSIZE error 19 */
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BBR_LOG_BBRRTT, /* BBR RTT is updated 20 */
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BBR_LOG_JUSTRET, /* We just returned out of output 21 */
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BBR_LOG_STATE, /* A BBR state change occurred 22 */
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BBR_LOG_PKT_EPOCH, /* A BBR packet epoch occurred 23 */
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BBR_LOG_PERSIST, /* BBR changed to/from a persists 24 */
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TCP_LOG_FLOWEND, /* End of a flow 25 */
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BBR_LOG_RTO, /* BBR's timeout includes BBR info 26 */
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BBR_LOG_DOSEG_DONE, /* hpts do_segment completes 27 */
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BBR_LOG_EXIT_GAIN, /* hpts do_segment completes 28 */
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BBR_LOG_THRESH_CALC, /* Doing threshold calculation 29 */
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TCP_LOG_MAPCHG, /* Map Changes to the sendmap 30 */
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TCP_LOG_USERSEND, /* User level sends data 31 */
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BBR_RSM_CLEARED, /* RSM cleared of ACK flags 32 */
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BBR_LOG_STATE_TARGET, /* Log of target at state 33 */
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BBR_LOG_TIME_EPOCH, /* A timed based Epoch occurred 34 */
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BBR_LOG_TO_PROCESS, /* A to was processed 35 */
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BBR_LOG_BBRTSO, /* TSO update 36 */
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BBR_LOG_HPTSDIAG, /* Hpts diag insert 37 */
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BBR_LOG_LOWGAIN, /* Low gain accounting 38 */
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BBR_LOG_PROGRESS, /* Progress timer event 39 */
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TCP_LOG_SOCKET_OPT, /* A socket option is set 40 */
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BBR_LOG_TIMERPREP, /* A BBR var to debug out TLP issues 41 */
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BBR_LOG_ENOBUF_JMP, /* We had a enobuf jump 42 */
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BBR_LOG_HPTSI_CALC, /* calc the hptsi time 43 */
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BBR_LOG_RTT_SHRINKS, /* We had a log reduction of rttProp 44 */
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BBR_LOG_BW_RED_EV, /* B/W reduction events 45 */
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BBR_LOG_REDUCE, /* old bbr log reduce for 4.1 and earlier 46*/
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TCP_LOG_RTT, /* A rtt (in useconds) is being sampled and applied to the srtt algo 47 */
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BBR_LOG_SETTINGS_CHG, /* Settings changed for loss response 48 */
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BBR_LOG_SRTT_GAIN_EVENT, /* SRTT gaining -- now not used 49 */
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TCP_LOG_REASS, /* Reassembly buffer logging 50 */
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TCP_HDWR_PACE_SIZE, /* TCP pacing size set (rl and rack uses this) 51 */
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BBR_LOG_HDWR_PACE, /* TCP Hardware pacing log 52 */
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BBR_LOG_TSTMP_VAL, /* Temp debug timestamp validation 53 */
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TCP_LOG_CONNEND, /* End of connection 54 */
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TCP_LOG_LRO, /* LRO entry 55 */
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TCP_SACK_FILTER_RES, /* Results of SACK Filter 56 */
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TCP_SAD_DETECTION, /* Sack Attack Detection 57 */
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TCP_TIMELY_WORK, /* Logs regarding Timely CC tweaks 58 */
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TCP_LOG_USER_EVENT, /* User space event data 59 */
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TCP_LOG_SENDFILE, /* sendfile() logging for TCP connections 60 */
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TCP_LOG_HTTP_T, /* logging of http request tracking 61 */
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TCP_LOG_ACCOUNTING, /* Log of TCP Accounting data 62 */
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TCP_LOG_FSB, /* FSB information 63 */
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RACK_DSACK_HANDLING, /* Handling of DSACK in rack for reordering window 64 */
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TCP_HYSTART, /* TCP Hystart logging 65 */
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TCP_CHG_QUERY, /* Change query during fnc_init() 66 */
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TCP_RACK_LOG_COLLAPSE, /* Window collapse by peer 67 */
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TCP_LOG_END /* End (keep at end) 68 */
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};
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enum tcp_log_states {
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TCP_LOG_STATE_CLEAR = -1, /* Deactivate and clear tracing */
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TCP_LOG_STATE_OFF = 0, /* Pause */
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TCP_LOG_STATE_TAIL=1, /* Keep the trailing events */
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TCP_LOG_STATE_HEAD=2, /* Keep the leading events */
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TCP_LOG_STATE_HEAD_AUTO=3, /* Keep the leading events, and
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automatically dump them to the
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device */
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TCP_LOG_STATE_CONTINUAL=4, /* Continually dump the data when full */
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TCP_LOG_STATE_TAIL_AUTO=5, /* Keep the trailing events, and
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automatically dump them when the
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session ends */
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};
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/* Use this if we don't know whether the operation succeeded. */
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#define ERRNO_UNK (-1)
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/*
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* If the user included dev/tcp_log/tcp_log_dev.h, then include our private
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* headers. Otherwise, there is no reason to pollute all the files with an
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* additional include.
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*
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* This structure is aligned to an 8-byte boundary to match the alignment
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* requirements of (struct tcp_log_buffer).
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*/
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#ifdef __tcp_log_dev_h__
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struct tcp_log_header {
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struct tcp_log_common_header tlh_common;
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#define tlh_version tlh_common.tlch_version
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#define tlh_type tlh_common.tlch_type
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#define tlh_length tlh_common.tlch_length
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struct in_endpoints tlh_ie;
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struct timeval tlh_offset; /* Uptime -> UTC offset */
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char tlh_id[TCP_LOG_ID_LEN];
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char tlh_reason[TCP_LOG_REASON_LEN];
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char tlh_tag[TCP_LOG_TAG_LEN];
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uint8_t tlh_af;
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uint8_t _pad[7];
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} ALIGN_TCP_LOG;
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#ifdef _KERNEL
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struct tcp_log_dev_log_queue {
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struct tcp_log_dev_queue tldl_common;
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char tldl_id[TCP_LOG_ID_LEN];
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char tldl_reason[TCP_LOG_REASON_LEN];
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char tldl_tag[TCP_LOG_TAG_LEN];
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struct in_endpoints tldl_ie;
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struct tcp_log_stailq tldl_entries;
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int tldl_count;
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uint8_t tldl_af;
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};
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#endif /* _KERNEL */
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#endif /* __tcp_log_dev_h__ */
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#ifdef _KERNEL
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#define TCP_LOG_BUF_DEFAULT_SESSION_LIMIT 5000
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#define TCP_LOG_BUF_DEFAULT_GLOBAL_LIMIT 5000000
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/*
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* TCP_LOG_EVENT_VERBOSE: The same as TCP_LOG_EVENT, except it always
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* tries to record verbose information.
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*/
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#define TCP_LOG_EVENT_VERBOSE(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder, tv) \
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do { \
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if (tp->t_logstate != TCP_LOG_STATE_OFF) \
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tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \
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errornum, len, stackinfo, th_hostorder, \
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tp->t_output_caller, __func__, __LINE__, tv);\
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} while (0)
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/*
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* TCP_LOG_EVENT: This is a macro so we can capture function/line
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* information when needed.
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*
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* Prototype:
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* TCP_LOG_EVENT(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf,
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* struct sockbuf *txbuf, uint8_t eventid, int errornum,
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* union tcp_log_stackspecific *stackinfo)
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*
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* tp is mandatory and must be write locked.
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* th is optional; if present, it will appear in the record.
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* rxbuf and txbuf are optional; if present, they will appear in the record.
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* eventid is mandatory.
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* errornum is mandatory (it indicates the success or failure of the
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* operation associated with the event).
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* len indicates the length of the packet. If no packet, use 0.
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* stackinfo is optional; if present, it will appear in the record.
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*/
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#ifdef TCP_LOG_FORCEVERBOSE
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#define TCP_LOG_EVENT TCP_LOG_EVENT_VERBOSE
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#else
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#define TCP_LOG_EVENT(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder) \
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do { \
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if (tcp_log_verbose) \
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TCP_LOG_EVENT_VERBOSE(tp, th, rxbuf, txbuf, \
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eventid, errornum, len, stackinfo, \
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th_hostorder, NULL); \
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else if (tp->t_logstate != TCP_LOG_STATE_OFF) \
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tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \
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errornum, len, stackinfo, th_hostorder, \
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NULL, NULL, 0, NULL); \
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} while (0)
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#endif /* TCP_LOG_FORCEVERBOSE */
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#define TCP_LOG_EVENTP(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder, tv) \
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do { \
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if (tp->t_logstate != TCP_LOG_STATE_OFF) \
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tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \
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errornum, len, stackinfo, th_hostorder, \
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NULL, NULL, 0, tv); \
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} while (0)
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#ifdef TCP_BLACKBOX
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extern bool tcp_log_verbose;
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void tcp_log_drain(struct tcpcb *tp);
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int tcp_log_dump_tp_logbuf(struct tcpcb *tp, char *reason, int how, bool force);
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void tcp_log_dump_tp_bucket_logbufs(struct tcpcb *tp, char *reason);
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struct tcp_log_buffer *tcp_log_event_(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf,
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struct sockbuf *txbuf, uint8_t eventid, int errornum, uint32_t len,
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union tcp_log_stackspecific *stackinfo, int th_hostorder,
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const char *output_caller, const char *func, int line, const struct timeval *tv);
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size_t tcp_log_get_id(struct tcpcb *tp, char *buf);
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size_t tcp_log_get_tag(struct tcpcb *tp, char *buf);
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u_int tcp_log_get_id_cnt(struct tcpcb *tp);
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int tcp_log_getlogbuf(struct sockopt *sopt, struct tcpcb *tp);
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void tcp_log_init(void);
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int tcp_log_set_id(struct tcpcb *tp, char *id);
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int tcp_log_set_tag(struct tcpcb *tp, char *tag);
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int tcp_log_state_change(struct tcpcb *tp, int state);
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void tcp_log_tcpcbinit(struct tcpcb *tp);
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void tcp_log_tcpcbfini(struct tcpcb *tp);
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void tcp_log_flowend(struct tcpcb *tp);
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#else /* !TCP_BLACKBOX */
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#define tcp_log_verbose (false)
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static inline struct tcp_log_buffer *
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tcp_log_event_(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf,
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struct sockbuf *txbuf, uint8_t eventid, int errornum, uint32_t len,
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union tcp_log_stackspecific *stackinfo, int th_hostorder,
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const char *output_caller, const char *func, int line,
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const struct timeval *tv)
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{
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return (NULL);
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}
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#endif /* TCP_BLACKBOX */
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#endif /* _KERNEL */
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#endif /* __tcp_log_buf_h__ */
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