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3687b1dc6f
Refer to RFC2012, tcpAttemptFails is defined as following: tcpAttemptFails OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times TCP connections have made a direct transition to the CLOSED state from either the SYN-SENT state or the SYN-RCVD state, plus the number of times TCP connections have made a direct transition to the LISTEN state from the SYN-RCVD state." ::= { tcp 7 } When I lookup into RFC793, I found that the state change should occured under following condition: 1. SYN-SENT -> CLOSED a) Received ACK,RST segment when SYN-SENT state. 2. SYN-RCVD -> CLOSED b) Received SYN segment when SYN-RCVD state(came from LISTEN). c) Received RST segment when SYN-RCVD state(came from SYN-SENT). d) Received SYN segment when SYN-RCVD state(came from SYN-SENT). 3. SYN-RCVD -> LISTEN e) Received RST segment when SYN-RCVD state(came from LISTEN). In my test, those direct state transition can not be counted to tcpAttemptFails. Signed-off-by: Wei Yongjun <yjwei@nanjing-fnst.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1104 lines
32 KiB
C
1104 lines
32 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the TCP module.
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*
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* Version: @(#)tcp.h 1.0.5 05/23/93
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _TCP_H
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#define _TCP_H
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#define TCP_DEBUG 1
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#define FASTRETRANS_DEBUG 1
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#include <linux/list.h>
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#include <linux/tcp.h>
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#include <linux/slab.h>
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#include <linux/cache.h>
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#include <linux/percpu.h>
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#include <linux/skbuff.h>
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#include <linux/dmaengine.h>
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#include <net/inet_connection_sock.h>
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#include <net/inet_timewait_sock.h>
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#include <net/inet_hashtables.h>
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#include <net/checksum.h>
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#include <net/request_sock.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/ip.h>
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#include <net/tcp_states.h>
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#include <linux/seq_file.h>
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extern struct inet_hashinfo tcp_hashinfo;
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extern atomic_t tcp_orphan_count;
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extern void tcp_time_wait(struct sock *sk, int state, int timeo);
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#define MAX_TCP_HEADER (128 + MAX_HEADER)
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/*
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* Never offer a window over 32767 without using window scaling. Some
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* poor stacks do signed 16bit maths!
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*/
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#define MAX_TCP_WINDOW 32767U
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/* Minimal accepted MSS. It is (60+60+8) - (20+20). */
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#define TCP_MIN_MSS 88U
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/* Minimal RCV_MSS. */
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#define TCP_MIN_RCVMSS 536U
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/* The least MTU to use for probing */
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#define TCP_BASE_MSS 512
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/* After receiving this amount of duplicate ACKs fast retransmit starts. */
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#define TCP_FASTRETRANS_THRESH 3
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/* Maximal reordering. */
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#define TCP_MAX_REORDERING 127
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/* Maximal number of ACKs sent quickly to accelerate slow-start. */
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#define TCP_MAX_QUICKACKS 16U
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/* urg_data states */
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#define TCP_URG_VALID 0x0100
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#define TCP_URG_NOTYET 0x0200
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#define TCP_URG_READ 0x0400
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#define TCP_RETR1 3 /*
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* This is how many retries it does before it
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* tries to figure out if the gateway is
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* down. Minimal RFC value is 3; it corresponds
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* to ~3sec-8min depending on RTO.
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*/
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#define TCP_RETR2 15 /*
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* This should take at least
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* 90 minutes to time out.
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* RFC1122 says that the limit is 100 sec.
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* 15 is ~13-30min depending on RTO.
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*/
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#define TCP_SYN_RETRIES 5 /* number of times to retry active opening a
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* connection: ~180sec is RFC minimum */
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#define TCP_SYNACK_RETRIES 5 /* number of times to retry passive opening a
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* connection: ~180sec is RFC minimum */
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#define TCP_ORPHAN_RETRIES 7 /* number of times to retry on an orphaned
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* socket. 7 is ~50sec-16min.
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*/
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#define TCP_TIMEWAIT_LEN (60*HZ) /* how long to wait to destroy TIME-WAIT
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* state, about 60 seconds */
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#define TCP_FIN_TIMEOUT TCP_TIMEWAIT_LEN
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/* BSD style FIN_WAIT2 deadlock breaker.
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* It used to be 3min, new value is 60sec,
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* to combine FIN-WAIT-2 timeout with
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* TIME-WAIT timer.
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*/
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#define TCP_DELACK_MAX ((unsigned)(HZ/5)) /* maximal time to delay before sending an ACK */
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#if HZ >= 100
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#define TCP_DELACK_MIN ((unsigned)(HZ/25)) /* minimal time to delay before sending an ACK */
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#define TCP_ATO_MIN ((unsigned)(HZ/25))
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#else
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#define TCP_DELACK_MIN 4U
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#define TCP_ATO_MIN 4U
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#endif
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#define TCP_RTO_MAX ((unsigned)(120*HZ))
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#define TCP_RTO_MIN ((unsigned)(HZ/5))
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#define TCP_TIMEOUT_INIT ((unsigned)(3*HZ)) /* RFC 1122 initial RTO value */
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#define TCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ/2U)) /* Maximal interval between probes
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* for local resources.
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*/
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#define TCP_KEEPALIVE_TIME (120*60*HZ) /* two hours */
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#define TCP_KEEPALIVE_PROBES 9 /* Max of 9 keepalive probes */
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#define TCP_KEEPALIVE_INTVL (75*HZ)
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#define MAX_TCP_KEEPIDLE 32767
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#define MAX_TCP_KEEPINTVL 32767
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#define MAX_TCP_KEEPCNT 127
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#define MAX_TCP_SYNCNT 127
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#define TCP_SYNQ_INTERVAL (HZ/5) /* Period of SYNACK timer */
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#define TCP_SYNQ_HSIZE 512 /* Size of SYNACK hash table */
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#define TCP_PAWS_24DAYS (60 * 60 * 24 * 24)
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#define TCP_PAWS_MSL 60 /* Per-host timestamps are invalidated
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* after this time. It should be equal
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* (or greater than) TCP_TIMEWAIT_LEN
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* to provide reliability equal to one
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* provided by timewait state.
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*/
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#define TCP_PAWS_WINDOW 1 /* Replay window for per-host
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* timestamps. It must be less than
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* minimal timewait lifetime.
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*/
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/*
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* TCP option
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*/
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#define TCPOPT_NOP 1 /* Padding */
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#define TCPOPT_EOL 0 /* End of options */
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#define TCPOPT_MSS 2 /* Segment size negotiating */
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#define TCPOPT_WINDOW 3 /* Window scaling */
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#define TCPOPT_SACK_PERM 4 /* SACK Permitted */
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#define TCPOPT_SACK 5 /* SACK Block */
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#define TCPOPT_TIMESTAMP 8 /* Better RTT estimations/PAWS */
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/*
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* TCP option lengths
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*/
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#define TCPOLEN_MSS 4
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#define TCPOLEN_WINDOW 3
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#define TCPOLEN_SACK_PERM 2
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#define TCPOLEN_TIMESTAMP 10
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/* But this is what stacks really send out. */
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#define TCPOLEN_TSTAMP_ALIGNED 12
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#define TCPOLEN_WSCALE_ALIGNED 4
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#define TCPOLEN_SACKPERM_ALIGNED 4
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#define TCPOLEN_SACK_BASE 2
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#define TCPOLEN_SACK_BASE_ALIGNED 4
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#define TCPOLEN_SACK_PERBLOCK 8
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/* Flags in tp->nonagle */
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#define TCP_NAGLE_OFF 1 /* Nagle's algo is disabled */
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#define TCP_NAGLE_CORK 2 /* Socket is corked */
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#define TCP_NAGLE_PUSH 4 /* Cork is overridden for already queued data */
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extern struct inet_timewait_death_row tcp_death_row;
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/* sysctl variables for tcp */
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extern int sysctl_tcp_timestamps;
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extern int sysctl_tcp_window_scaling;
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extern int sysctl_tcp_sack;
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extern int sysctl_tcp_fin_timeout;
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extern int sysctl_tcp_keepalive_time;
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extern int sysctl_tcp_keepalive_probes;
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extern int sysctl_tcp_keepalive_intvl;
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extern int sysctl_tcp_syn_retries;
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extern int sysctl_tcp_synack_retries;
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extern int sysctl_tcp_retries1;
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extern int sysctl_tcp_retries2;
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extern int sysctl_tcp_orphan_retries;
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extern int sysctl_tcp_syncookies;
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extern int sysctl_tcp_retrans_collapse;
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extern int sysctl_tcp_stdurg;
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extern int sysctl_tcp_rfc1337;
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extern int sysctl_tcp_abort_on_overflow;
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extern int sysctl_tcp_max_orphans;
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extern int sysctl_tcp_fack;
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extern int sysctl_tcp_reordering;
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extern int sysctl_tcp_ecn;
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extern int sysctl_tcp_dsack;
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extern int sysctl_tcp_mem[3];
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extern int sysctl_tcp_wmem[3];
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extern int sysctl_tcp_rmem[3];
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extern int sysctl_tcp_app_win;
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extern int sysctl_tcp_adv_win_scale;
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extern int sysctl_tcp_tw_reuse;
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extern int sysctl_tcp_frto;
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extern int sysctl_tcp_low_latency;
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extern int sysctl_tcp_dma_copybreak;
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extern int sysctl_tcp_nometrics_save;
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extern int sysctl_tcp_moderate_rcvbuf;
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extern int sysctl_tcp_tso_win_divisor;
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extern int sysctl_tcp_abc;
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extern int sysctl_tcp_mtu_probing;
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extern int sysctl_tcp_base_mss;
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extern int sysctl_tcp_workaround_signed_windows;
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extern int sysctl_tcp_slow_start_after_idle;
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extern atomic_t tcp_memory_allocated;
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extern atomic_t tcp_sockets_allocated;
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extern int tcp_memory_pressure;
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/*
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* The next routines deal with comparing 32 bit unsigned ints
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* and worry about wraparound (automatic with unsigned arithmetic).
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*/
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static inline int before(__u32 seq1, __u32 seq2)
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{
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return (__s32)(seq1-seq2) < 0;
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}
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static inline int after(__u32 seq1, __u32 seq2)
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{
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return (__s32)(seq2-seq1) < 0;
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}
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/* is s2<=s1<=s3 ? */
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static inline int between(__u32 seq1, __u32 seq2, __u32 seq3)
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{
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return seq3 - seq2 >= seq1 - seq2;
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}
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extern struct proto tcp_prot;
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DECLARE_SNMP_STAT(struct tcp_mib, tcp_statistics);
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#define TCP_INC_STATS(field) SNMP_INC_STATS(tcp_statistics, field)
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#define TCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(tcp_statistics, field)
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#define TCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(tcp_statistics, field)
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#define TCP_DEC_STATS(field) SNMP_DEC_STATS(tcp_statistics, field)
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#define TCP_ADD_STATS_BH(field, val) SNMP_ADD_STATS_BH(tcp_statistics, field, val)
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#define TCP_ADD_STATS_USER(field, val) SNMP_ADD_STATS_USER(tcp_statistics, field, val)
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extern void tcp_v4_err(struct sk_buff *skb, u32);
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extern void tcp_shutdown (struct sock *sk, int how);
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extern int tcp_v4_rcv(struct sk_buff *skb);
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extern int tcp_v4_remember_stamp(struct sock *sk);
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extern int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw);
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extern int tcp_sendmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t size);
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extern ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags);
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extern int tcp_ioctl(struct sock *sk,
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int cmd,
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unsigned long arg);
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extern int tcp_rcv_state_process(struct sock *sk,
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struct sk_buff *skb,
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struct tcphdr *th,
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unsigned len);
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extern int tcp_rcv_established(struct sock *sk,
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struct sk_buff *skb,
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struct tcphdr *th,
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unsigned len);
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extern void tcp_rcv_space_adjust(struct sock *sk);
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extern void tcp_cleanup_rbuf(struct sock *sk, int copied);
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extern int tcp_twsk_unique(struct sock *sk,
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struct sock *sktw, void *twp);
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static inline void tcp_dec_quickack_mode(struct sock *sk,
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const unsigned int pkts)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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if (icsk->icsk_ack.quick) {
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if (pkts >= icsk->icsk_ack.quick) {
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icsk->icsk_ack.quick = 0;
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/* Leaving quickack mode we deflate ATO. */
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icsk->icsk_ack.ato = TCP_ATO_MIN;
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} else
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icsk->icsk_ack.quick -= pkts;
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}
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}
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extern void tcp_enter_quickack_mode(struct sock *sk);
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static inline void tcp_clear_options(struct tcp_options_received *rx_opt)
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{
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rx_opt->tstamp_ok = rx_opt->sack_ok = rx_opt->wscale_ok = rx_opt->snd_wscale = 0;
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}
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enum tcp_tw_status
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{
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TCP_TW_SUCCESS = 0,
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TCP_TW_RST = 1,
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TCP_TW_ACK = 2,
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TCP_TW_SYN = 3
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};
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extern enum tcp_tw_status tcp_timewait_state_process(struct inet_timewait_sock *tw,
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struct sk_buff *skb,
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const struct tcphdr *th);
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extern struct sock * tcp_check_req(struct sock *sk,struct sk_buff *skb,
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struct request_sock *req,
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struct request_sock **prev);
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extern int tcp_child_process(struct sock *parent,
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struct sock *child,
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struct sk_buff *skb);
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extern void tcp_enter_frto(struct sock *sk);
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extern void tcp_enter_loss(struct sock *sk, int how);
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extern void tcp_clear_retrans(struct tcp_sock *tp);
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extern void tcp_update_metrics(struct sock *sk);
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extern void tcp_close(struct sock *sk,
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long timeout);
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extern unsigned int tcp_poll(struct file * file, struct socket *sock, struct poll_table_struct *wait);
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extern int tcp_getsockopt(struct sock *sk, int level,
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int optname,
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char __user *optval,
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int __user *optlen);
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extern int tcp_setsockopt(struct sock *sk, int level,
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int optname, char __user *optval,
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int optlen);
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extern int compat_tcp_getsockopt(struct sock *sk,
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int level, int optname,
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char __user *optval, int __user *optlen);
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extern int compat_tcp_setsockopt(struct sock *sk,
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int level, int optname,
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char __user *optval, int optlen);
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extern void tcp_set_keepalive(struct sock *sk, int val);
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extern int tcp_recvmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg,
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size_t len, int nonblock,
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int flags, int *addr_len);
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extern void tcp_parse_options(struct sk_buff *skb,
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struct tcp_options_received *opt_rx,
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int estab);
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/*
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* TCP v4 functions exported for the inet6 API
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*/
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extern void tcp_v4_send_check(struct sock *sk, int len,
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struct sk_buff *skb);
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extern int tcp_v4_conn_request(struct sock *sk,
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struct sk_buff *skb);
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extern struct sock * tcp_create_openreq_child(struct sock *sk,
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struct request_sock *req,
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struct sk_buff *skb);
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extern struct sock * tcp_v4_syn_recv_sock(struct sock *sk,
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struct sk_buff *skb,
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struct request_sock *req,
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struct dst_entry *dst);
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extern int tcp_v4_do_rcv(struct sock *sk,
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struct sk_buff *skb);
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extern int tcp_v4_connect(struct sock *sk,
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struct sockaddr *uaddr,
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int addr_len);
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extern int tcp_connect(struct sock *sk);
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extern struct sk_buff * tcp_make_synack(struct sock *sk,
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struct dst_entry *dst,
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struct request_sock *req);
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extern int tcp_disconnect(struct sock *sk, int flags);
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extern void tcp_unhash(struct sock *sk);
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/* From syncookies.c */
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extern struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
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struct ip_options *opt);
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extern __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb,
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__u16 *mss);
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/* tcp_output.c */
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extern void __tcp_push_pending_frames(struct sock *sk, struct tcp_sock *tp,
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unsigned int cur_mss, int nonagle);
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extern int tcp_may_send_now(struct sock *sk, struct tcp_sock *tp);
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extern int tcp_retransmit_skb(struct sock *, struct sk_buff *);
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extern void tcp_xmit_retransmit_queue(struct sock *);
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extern void tcp_simple_retransmit(struct sock *);
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extern int tcp_trim_head(struct sock *, struct sk_buff *, u32);
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extern int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int);
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extern void tcp_send_probe0(struct sock *);
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extern void tcp_send_partial(struct sock *);
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extern int tcp_write_wakeup(struct sock *);
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extern void tcp_send_fin(struct sock *sk);
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extern void tcp_send_active_reset(struct sock *sk, gfp_t priority);
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extern int tcp_send_synack(struct sock *);
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extern void tcp_push_one(struct sock *, unsigned int mss_now);
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extern void tcp_send_ack(struct sock *sk);
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extern void tcp_send_delayed_ack(struct sock *sk);
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/* tcp_input.c */
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extern void tcp_cwnd_application_limited(struct sock *sk);
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/* tcp_timer.c */
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extern void tcp_init_xmit_timers(struct sock *);
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static inline void tcp_clear_xmit_timers(struct sock *sk)
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{
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inet_csk_clear_xmit_timers(sk);
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}
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extern unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu);
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extern unsigned int tcp_current_mss(struct sock *sk, int large);
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/* tcp.c */
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extern void tcp_get_info(struct sock *, struct tcp_info *);
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/* Read 'sendfile()'-style from a TCP socket */
|
|
typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *,
|
|
unsigned int, size_t);
|
|
extern int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
|
|
sk_read_actor_t recv_actor);
|
|
|
|
extern void tcp_initialize_rcv_mss(struct sock *sk);
|
|
|
|
extern int tcp_mtu_to_mss(struct sock *sk, int pmtu);
|
|
extern int tcp_mss_to_mtu(struct sock *sk, int mss);
|
|
extern void tcp_mtup_init(struct sock *sk);
|
|
|
|
static inline void __tcp_fast_path_on(struct tcp_sock *tp, u32 snd_wnd)
|
|
{
|
|
tp->pred_flags = htonl((tp->tcp_header_len << 26) |
|
|
ntohl(TCP_FLAG_ACK) |
|
|
snd_wnd);
|
|
}
|
|
|
|
static inline void tcp_fast_path_on(struct tcp_sock *tp)
|
|
{
|
|
__tcp_fast_path_on(tp, tp->snd_wnd >> tp->rx_opt.snd_wscale);
|
|
}
|
|
|
|
static inline void tcp_fast_path_check(struct sock *sk, struct tcp_sock *tp)
|
|
{
|
|
if (skb_queue_empty(&tp->out_of_order_queue) &&
|
|
tp->rcv_wnd &&
|
|
atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf &&
|
|
!tp->urg_data)
|
|
tcp_fast_path_on(tp);
|
|
}
|
|
|
|
/* Compute the actual receive window we are currently advertising.
|
|
* Rcv_nxt can be after the window if our peer push more data
|
|
* than the offered window.
|
|
*/
|
|
static inline u32 tcp_receive_window(const struct tcp_sock *tp)
|
|
{
|
|
s32 win = tp->rcv_wup + tp->rcv_wnd - tp->rcv_nxt;
|
|
|
|
if (win < 0)
|
|
win = 0;
|
|
return (u32) win;
|
|
}
|
|
|
|
/* Choose a new window, without checks for shrinking, and without
|
|
* scaling applied to the result. The caller does these things
|
|
* if necessary. This is a "raw" window selection.
|
|
*/
|
|
extern u32 __tcp_select_window(struct sock *sk);
|
|
|
|
/* TCP timestamps are only 32-bits, this causes a slight
|
|
* complication on 64-bit systems since we store a snapshot
|
|
* of jiffies in the buffer control blocks below. We decided
|
|
* to use only the low 32-bits of jiffies and hide the ugly
|
|
* casts with the following macro.
|
|
*/
|
|
#define tcp_time_stamp ((__u32)(jiffies))
|
|
|
|
/* This is what the send packet queuing engine uses to pass
|
|
* TCP per-packet control information to the transmission
|
|
* code. We also store the host-order sequence numbers in
|
|
* here too. This is 36 bytes on 32-bit architectures,
|
|
* 40 bytes on 64-bit machines, if this grows please adjust
|
|
* skbuff.h:skbuff->cb[xxx] size appropriately.
|
|
*/
|
|
struct tcp_skb_cb {
|
|
union {
|
|
struct inet_skb_parm h4;
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
struct inet6_skb_parm h6;
|
|
#endif
|
|
} header; /* For incoming frames */
|
|
__u32 seq; /* Starting sequence number */
|
|
__u32 end_seq; /* SEQ + FIN + SYN + datalen */
|
|
__u32 when; /* used to compute rtt's */
|
|
__u8 flags; /* TCP header flags. */
|
|
|
|
/* NOTE: These must match up to the flags byte in a
|
|
* real TCP header.
|
|
*/
|
|
#define TCPCB_FLAG_FIN 0x01
|
|
#define TCPCB_FLAG_SYN 0x02
|
|
#define TCPCB_FLAG_RST 0x04
|
|
#define TCPCB_FLAG_PSH 0x08
|
|
#define TCPCB_FLAG_ACK 0x10
|
|
#define TCPCB_FLAG_URG 0x20
|
|
#define TCPCB_FLAG_ECE 0x40
|
|
#define TCPCB_FLAG_CWR 0x80
|
|
|
|
__u8 sacked; /* State flags for SACK/FACK. */
|
|
#define TCPCB_SACKED_ACKED 0x01 /* SKB ACK'd by a SACK block */
|
|
#define TCPCB_SACKED_RETRANS 0x02 /* SKB retransmitted */
|
|
#define TCPCB_LOST 0x04 /* SKB is lost */
|
|
#define TCPCB_TAGBITS 0x07 /* All tag bits */
|
|
|
|
#define TCPCB_EVER_RETRANS 0x80 /* Ever retransmitted frame */
|
|
#define TCPCB_RETRANS (TCPCB_SACKED_RETRANS|TCPCB_EVER_RETRANS)
|
|
|
|
#define TCPCB_URG 0x20 /* Urgent pointer advanced here */
|
|
|
|
#define TCPCB_AT_TAIL (TCPCB_URG)
|
|
|
|
__u16 urg_ptr; /* Valid w/URG flags is set. */
|
|
__u32 ack_seq; /* Sequence number ACK'd */
|
|
};
|
|
|
|
#define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0]))
|
|
|
|
#include <net/tcp_ecn.h>
|
|
|
|
/* Due to TSO, an SKB can be composed of multiple actual
|
|
* packets. To keep these tracked properly, we use this.
|
|
*/
|
|
static inline int tcp_skb_pcount(const struct sk_buff *skb)
|
|
{
|
|
return skb_shinfo(skb)->gso_segs;
|
|
}
|
|
|
|
/* This is valid iff tcp_skb_pcount() > 1. */
|
|
static inline int tcp_skb_mss(const struct sk_buff *skb)
|
|
{
|
|
return skb_shinfo(skb)->gso_size;
|
|
}
|
|
|
|
static inline void tcp_dec_pcount_approx(__u32 *count,
|
|
const struct sk_buff *skb)
|
|
{
|
|
if (*count) {
|
|
*count -= tcp_skb_pcount(skb);
|
|
if ((int)*count < 0)
|
|
*count = 0;
|
|
}
|
|
}
|
|
|
|
static inline void tcp_packets_out_inc(struct sock *sk,
|
|
struct tcp_sock *tp,
|
|
const struct sk_buff *skb)
|
|
{
|
|
int orig = tp->packets_out;
|
|
|
|
tp->packets_out += tcp_skb_pcount(skb);
|
|
if (!orig)
|
|
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
|
|
inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
|
|
}
|
|
|
|
static inline void tcp_packets_out_dec(struct tcp_sock *tp,
|
|
const struct sk_buff *skb)
|
|
{
|
|
tp->packets_out -= tcp_skb_pcount(skb);
|
|
}
|
|
|
|
/* Events passed to congestion control interface */
|
|
enum tcp_ca_event {
|
|
CA_EVENT_TX_START, /* first transmit when no packets in flight */
|
|
CA_EVENT_CWND_RESTART, /* congestion window restart */
|
|
CA_EVENT_COMPLETE_CWR, /* end of congestion recovery */
|
|
CA_EVENT_FRTO, /* fast recovery timeout */
|
|
CA_EVENT_LOSS, /* loss timeout */
|
|
CA_EVENT_FAST_ACK, /* in sequence ack */
|
|
CA_EVENT_SLOW_ACK, /* other ack */
|
|
};
|
|
|
|
/*
|
|
* Interface for adding new TCP congestion control handlers
|
|
*/
|
|
#define TCP_CA_NAME_MAX 16
|
|
struct tcp_congestion_ops {
|
|
struct list_head list;
|
|
|
|
/* initialize private data (optional) */
|
|
void (*init)(struct sock *sk);
|
|
/* cleanup private data (optional) */
|
|
void (*release)(struct sock *sk);
|
|
|
|
/* return slow start threshold (required) */
|
|
u32 (*ssthresh)(struct sock *sk);
|
|
/* lower bound for congestion window (optional) */
|
|
u32 (*min_cwnd)(const struct sock *sk);
|
|
/* do new cwnd calculation (required) */
|
|
void (*cong_avoid)(struct sock *sk, u32 ack,
|
|
u32 rtt, u32 in_flight, int good_ack);
|
|
/* round trip time sample per acked packet (optional) */
|
|
void (*rtt_sample)(struct sock *sk, u32 usrtt);
|
|
/* call before changing ca_state (optional) */
|
|
void (*set_state)(struct sock *sk, u8 new_state);
|
|
/* call when cwnd event occurs (optional) */
|
|
void (*cwnd_event)(struct sock *sk, enum tcp_ca_event ev);
|
|
/* new value of cwnd after loss (optional) */
|
|
u32 (*undo_cwnd)(struct sock *sk);
|
|
/* hook for packet ack accounting (optional) */
|
|
void (*pkts_acked)(struct sock *sk, u32 num_acked);
|
|
/* get info for inet_diag (optional) */
|
|
void (*get_info)(struct sock *sk, u32 ext, struct sk_buff *skb);
|
|
|
|
char name[TCP_CA_NAME_MAX];
|
|
struct module *owner;
|
|
};
|
|
|
|
extern int tcp_register_congestion_control(struct tcp_congestion_ops *type);
|
|
extern void tcp_unregister_congestion_control(struct tcp_congestion_ops *type);
|
|
|
|
extern void tcp_init_congestion_control(struct sock *sk);
|
|
extern void tcp_cleanup_congestion_control(struct sock *sk);
|
|
extern int tcp_set_default_congestion_control(const char *name);
|
|
extern void tcp_get_default_congestion_control(char *name);
|
|
extern int tcp_set_congestion_control(struct sock *sk, const char *name);
|
|
extern void tcp_slow_start(struct tcp_sock *tp);
|
|
|
|
extern struct tcp_congestion_ops tcp_init_congestion_ops;
|
|
extern u32 tcp_reno_ssthresh(struct sock *sk);
|
|
extern void tcp_reno_cong_avoid(struct sock *sk, u32 ack,
|
|
u32 rtt, u32 in_flight, int flag);
|
|
extern u32 tcp_reno_min_cwnd(const struct sock *sk);
|
|
extern struct tcp_congestion_ops tcp_reno;
|
|
|
|
static inline void tcp_set_ca_state(struct sock *sk, const u8 ca_state)
|
|
{
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
|
|
if (icsk->icsk_ca_ops->set_state)
|
|
icsk->icsk_ca_ops->set_state(sk, ca_state);
|
|
icsk->icsk_ca_state = ca_state;
|
|
}
|
|
|
|
static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event)
|
|
{
|
|
const struct inet_connection_sock *icsk = inet_csk(sk);
|
|
|
|
if (icsk->icsk_ca_ops->cwnd_event)
|
|
icsk->icsk_ca_ops->cwnd_event(sk, event);
|
|
}
|
|
|
|
/* This determines how many packets are "in the network" to the best
|
|
* of our knowledge. In many cases it is conservative, but where
|
|
* detailed information is available from the receiver (via SACK
|
|
* blocks etc.) we can make more aggressive calculations.
|
|
*
|
|
* Use this for decisions involving congestion control, use just
|
|
* tp->packets_out to determine if the send queue is empty or not.
|
|
*
|
|
* Read this equation as:
|
|
*
|
|
* "Packets sent once on transmission queue" MINUS
|
|
* "Packets left network, but not honestly ACKed yet" PLUS
|
|
* "Packets fast retransmitted"
|
|
*/
|
|
static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
|
|
{
|
|
return (tp->packets_out - tp->left_out + tp->retrans_out);
|
|
}
|
|
|
|
/* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd.
|
|
* The exception is rate halving phase, when cwnd is decreasing towards
|
|
* ssthresh.
|
|
*/
|
|
static inline __u32 tcp_current_ssthresh(const struct sock *sk)
|
|
{
|
|
const struct tcp_sock *tp = tcp_sk(sk);
|
|
if ((1 << inet_csk(sk)->icsk_ca_state) & (TCPF_CA_CWR | TCPF_CA_Recovery))
|
|
return tp->snd_ssthresh;
|
|
else
|
|
return max(tp->snd_ssthresh,
|
|
((tp->snd_cwnd >> 1) +
|
|
(tp->snd_cwnd >> 2)));
|
|
}
|
|
|
|
static inline void tcp_sync_left_out(struct tcp_sock *tp)
|
|
{
|
|
if (tp->rx_opt.sack_ok &&
|
|
(tp->sacked_out >= tp->packets_out - tp->lost_out))
|
|
tp->sacked_out = tp->packets_out - tp->lost_out;
|
|
tp->left_out = tp->sacked_out + tp->lost_out;
|
|
}
|
|
|
|
extern void tcp_enter_cwr(struct sock *sk);
|
|
extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);
|
|
|
|
/* Slow start with delack produces 3 packets of burst, so that
|
|
* it is safe "de facto".
|
|
*/
|
|
static __inline__ __u32 tcp_max_burst(const struct tcp_sock *tp)
|
|
{
|
|
return 3;
|
|
}
|
|
|
|
/* RFC2861 Check whether we are limited by application or congestion window
|
|
* This is the inverse of cwnd check in tcp_tso_should_defer
|
|
*/
|
|
static inline int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
|
|
{
|
|
const struct tcp_sock *tp = tcp_sk(sk);
|
|
u32 left;
|
|
|
|
if (in_flight >= tp->snd_cwnd)
|
|
return 1;
|
|
|
|
if (!sk_can_gso(sk))
|
|
return 0;
|
|
|
|
left = tp->snd_cwnd - in_flight;
|
|
if (sysctl_tcp_tso_win_divisor)
|
|
return left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd;
|
|
else
|
|
return left <= tcp_max_burst(tp);
|
|
}
|
|
|
|
static inline void tcp_minshall_update(struct tcp_sock *tp, int mss,
|
|
const struct sk_buff *skb)
|
|
{
|
|
if (skb->len < mss)
|
|
tp->snd_sml = TCP_SKB_CB(skb)->end_seq;
|
|
}
|
|
|
|
static inline void tcp_check_probe_timer(struct sock *sk, struct tcp_sock *tp)
|
|
{
|
|
const struct inet_connection_sock *icsk = inet_csk(sk);
|
|
if (!tp->packets_out && !icsk->icsk_pending)
|
|
inet_csk_reset_xmit_timer(sk, ICSK_TIME_PROBE0,
|
|
icsk->icsk_rto, TCP_RTO_MAX);
|
|
}
|
|
|
|
static inline void tcp_push_pending_frames(struct sock *sk,
|
|
struct tcp_sock *tp)
|
|
{
|
|
__tcp_push_pending_frames(sk, tp, tcp_current_mss(sk, 1), tp->nonagle);
|
|
}
|
|
|
|
static inline void tcp_init_wl(struct tcp_sock *tp, u32 ack, u32 seq)
|
|
{
|
|
tp->snd_wl1 = seq;
|
|
}
|
|
|
|
static inline void tcp_update_wl(struct tcp_sock *tp, u32 ack, u32 seq)
|
|
{
|
|
tp->snd_wl1 = seq;
|
|
}
|
|
|
|
/*
|
|
* Calculate(/check) TCP checksum
|
|
*/
|
|
static inline u16 tcp_v4_check(struct tcphdr *th, int len,
|
|
unsigned long saddr, unsigned long daddr,
|
|
unsigned long base)
|
|
{
|
|
return csum_tcpudp_magic(saddr,daddr,len,IPPROTO_TCP,base);
|
|
}
|
|
|
|
static inline int __tcp_checksum_complete(struct sk_buff *skb)
|
|
{
|
|
return __skb_checksum_complete(skb);
|
|
}
|
|
|
|
static inline int tcp_checksum_complete(struct sk_buff *skb)
|
|
{
|
|
return skb->ip_summed != CHECKSUM_UNNECESSARY &&
|
|
__tcp_checksum_complete(skb);
|
|
}
|
|
|
|
/* Prequeue for VJ style copy to user, combined with checksumming. */
|
|
|
|
static inline void tcp_prequeue_init(struct tcp_sock *tp)
|
|
{
|
|
tp->ucopy.task = NULL;
|
|
tp->ucopy.len = 0;
|
|
tp->ucopy.memory = 0;
|
|
skb_queue_head_init(&tp->ucopy.prequeue);
|
|
#ifdef CONFIG_NET_DMA
|
|
tp->ucopy.dma_chan = NULL;
|
|
tp->ucopy.wakeup = 0;
|
|
tp->ucopy.pinned_list = NULL;
|
|
tp->ucopy.dma_cookie = 0;
|
|
#endif
|
|
}
|
|
|
|
/* Packet is added to VJ-style prequeue for processing in process
|
|
* context, if a reader task is waiting. Apparently, this exciting
|
|
* idea (VJ's mail "Re: query about TCP header on tcp-ip" of 07 Sep 93)
|
|
* failed somewhere. Latency? Burstiness? Well, at least now we will
|
|
* see, why it failed. 8)8) --ANK
|
|
*
|
|
* NOTE: is this not too big to inline?
|
|
*/
|
|
static inline int tcp_prequeue(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct tcp_sock *tp = tcp_sk(sk);
|
|
|
|
if (!sysctl_tcp_low_latency && tp->ucopy.task) {
|
|
__skb_queue_tail(&tp->ucopy.prequeue, skb);
|
|
tp->ucopy.memory += skb->truesize;
|
|
if (tp->ucopy.memory > sk->sk_rcvbuf) {
|
|
struct sk_buff *skb1;
|
|
|
|
BUG_ON(sock_owned_by_user(sk));
|
|
|
|
while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) {
|
|
sk->sk_backlog_rcv(sk, skb1);
|
|
NET_INC_STATS_BH(LINUX_MIB_TCPPREQUEUEDROPPED);
|
|
}
|
|
|
|
tp->ucopy.memory = 0;
|
|
} else if (skb_queue_len(&tp->ucopy.prequeue) == 1) {
|
|
wake_up_interruptible(sk->sk_sleep);
|
|
if (!inet_csk_ack_scheduled(sk))
|
|
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
|
|
(3 * TCP_RTO_MIN) / 4,
|
|
TCP_RTO_MAX);
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
#undef STATE_TRACE
|
|
|
|
#ifdef STATE_TRACE
|
|
static const char *statename[]={
|
|
"Unused","Established","Syn Sent","Syn Recv",
|
|
"Fin Wait 1","Fin Wait 2","Time Wait", "Close",
|
|
"Close Wait","Last ACK","Listen","Closing"
|
|
};
|
|
#endif
|
|
|
|
static inline void tcp_set_state(struct sock *sk, int state)
|
|
{
|
|
int oldstate = sk->sk_state;
|
|
|
|
switch (state) {
|
|
case TCP_ESTABLISHED:
|
|
if (oldstate != TCP_ESTABLISHED)
|
|
TCP_INC_STATS(TCP_MIB_CURRESTAB);
|
|
break;
|
|
|
|
case TCP_CLOSE:
|
|
if (oldstate == TCP_CLOSE_WAIT || oldstate == TCP_ESTABLISHED)
|
|
TCP_INC_STATS(TCP_MIB_ESTABRESETS);
|
|
|
|
sk->sk_prot->unhash(sk);
|
|
if (inet_csk(sk)->icsk_bind_hash &&
|
|
!(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
|
|
inet_put_port(&tcp_hashinfo, sk);
|
|
/* fall through */
|
|
default:
|
|
if (oldstate==TCP_ESTABLISHED)
|
|
TCP_DEC_STATS(TCP_MIB_CURRESTAB);
|
|
}
|
|
|
|
/* Change state AFTER socket is unhashed to avoid closed
|
|
* socket sitting in hash tables.
|
|
*/
|
|
sk->sk_state = state;
|
|
|
|
#ifdef STATE_TRACE
|
|
SOCK_DEBUG(sk, "TCP sk=%p, State %s -> %s\n",sk, statename[oldstate],statename[state]);
|
|
#endif
|
|
}
|
|
|
|
static inline void tcp_done(struct sock *sk)
|
|
{
|
|
if(sk->sk_state == TCP_SYN_SENT || sk->sk_state == TCP_SYN_RECV)
|
|
TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS);
|
|
|
|
tcp_set_state(sk, TCP_CLOSE);
|
|
tcp_clear_xmit_timers(sk);
|
|
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_state_change(sk);
|
|
else
|
|
inet_csk_destroy_sock(sk);
|
|
}
|
|
|
|
static inline void tcp_sack_reset(struct tcp_options_received *rx_opt)
|
|
{
|
|
rx_opt->dsack = 0;
|
|
rx_opt->eff_sacks = 0;
|
|
rx_opt->num_sacks = 0;
|
|
}
|
|
|
|
/* Determine a window scaling and initial window to offer. */
|
|
extern void tcp_select_initial_window(int __space, __u32 mss,
|
|
__u32 *rcv_wnd, __u32 *window_clamp,
|
|
int wscale_ok, __u8 *rcv_wscale);
|
|
|
|
static inline int tcp_win_from_space(int space)
|
|
{
|
|
return sysctl_tcp_adv_win_scale<=0 ?
|
|
(space>>(-sysctl_tcp_adv_win_scale)) :
|
|
space - (space>>sysctl_tcp_adv_win_scale);
|
|
}
|
|
|
|
/* Note: caller must be prepared to deal with negative returns */
|
|
static inline int tcp_space(const struct sock *sk)
|
|
{
|
|
return tcp_win_from_space(sk->sk_rcvbuf -
|
|
atomic_read(&sk->sk_rmem_alloc));
|
|
}
|
|
|
|
static inline int tcp_full_space(const struct sock *sk)
|
|
{
|
|
return tcp_win_from_space(sk->sk_rcvbuf);
|
|
}
|
|
|
|
static inline void tcp_openreq_init(struct request_sock *req,
|
|
struct tcp_options_received *rx_opt,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct inet_request_sock *ireq = inet_rsk(req);
|
|
|
|
req->rcv_wnd = 0; /* So that tcp_send_synack() knows! */
|
|
tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq;
|
|
req->mss = rx_opt->mss_clamp;
|
|
req->ts_recent = rx_opt->saw_tstamp ? rx_opt->rcv_tsval : 0;
|
|
ireq->tstamp_ok = rx_opt->tstamp_ok;
|
|
ireq->sack_ok = rx_opt->sack_ok;
|
|
ireq->snd_wscale = rx_opt->snd_wscale;
|
|
ireq->wscale_ok = rx_opt->wscale_ok;
|
|
ireq->acked = 0;
|
|
ireq->ecn_ok = 0;
|
|
ireq->rmt_port = skb->h.th->source;
|
|
}
|
|
|
|
extern void tcp_enter_memory_pressure(void);
|
|
|
|
static inline int keepalive_intvl_when(const struct tcp_sock *tp)
|
|
{
|
|
return tp->keepalive_intvl ? : sysctl_tcp_keepalive_intvl;
|
|
}
|
|
|
|
static inline int keepalive_time_when(const struct tcp_sock *tp)
|
|
{
|
|
return tp->keepalive_time ? : sysctl_tcp_keepalive_time;
|
|
}
|
|
|
|
static inline int tcp_fin_time(const struct sock *sk)
|
|
{
|
|
int fin_timeout = tcp_sk(sk)->linger2 ? : sysctl_tcp_fin_timeout;
|
|
const int rto = inet_csk(sk)->icsk_rto;
|
|
|
|
if (fin_timeout < (rto << 2) - (rto >> 1))
|
|
fin_timeout = (rto << 2) - (rto >> 1);
|
|
|
|
return fin_timeout;
|
|
}
|
|
|
|
static inline int tcp_paws_check(const struct tcp_options_received *rx_opt, int rst)
|
|
{
|
|
if ((s32)(rx_opt->rcv_tsval - rx_opt->ts_recent) >= 0)
|
|
return 0;
|
|
if (xtime.tv_sec >= rx_opt->ts_recent_stamp + TCP_PAWS_24DAYS)
|
|
return 0;
|
|
|
|
/* RST segments are not recommended to carry timestamp,
|
|
and, if they do, it is recommended to ignore PAWS because
|
|
"their cleanup function should take precedence over timestamps."
|
|
Certainly, it is mistake. It is necessary to understand the reasons
|
|
of this constraint to relax it: if peer reboots, clock may go
|
|
out-of-sync and half-open connections will not be reset.
|
|
Actually, the problem would be not existing if all
|
|
the implementations followed draft about maintaining clock
|
|
via reboots. Linux-2.2 DOES NOT!
|
|
|
|
However, we can relax time bounds for RST segments to MSL.
|
|
*/
|
|
if (rst && xtime.tv_sec >= rx_opt->ts_recent_stamp + TCP_PAWS_MSL)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
#define TCP_CHECK_TIMER(sk) do { } while (0)
|
|
|
|
static inline int tcp_use_frto(const struct sock *sk)
|
|
{
|
|
const struct tcp_sock *tp = tcp_sk(sk);
|
|
|
|
/* F-RTO must be activated in sysctl and there must be some
|
|
* unsent new data, and the advertised window should allow
|
|
* sending it.
|
|
*/
|
|
return (sysctl_tcp_frto && sk->sk_send_head &&
|
|
!after(TCP_SKB_CB(sk->sk_send_head)->end_seq,
|
|
tp->snd_una + tp->snd_wnd));
|
|
}
|
|
|
|
static inline void tcp_mib_init(void)
|
|
{
|
|
/* See RFC 2012 */
|
|
TCP_ADD_STATS_USER(TCP_MIB_RTOALGORITHM, 1);
|
|
TCP_ADD_STATS_USER(TCP_MIB_RTOMIN, TCP_RTO_MIN*1000/HZ);
|
|
TCP_ADD_STATS_USER(TCP_MIB_RTOMAX, TCP_RTO_MAX*1000/HZ);
|
|
TCP_ADD_STATS_USER(TCP_MIB_MAXCONN, -1);
|
|
}
|
|
|
|
/*from STCP */
|
|
static inline void clear_all_retrans_hints(struct tcp_sock *tp){
|
|
tp->lost_skb_hint = NULL;
|
|
tp->scoreboard_skb_hint = NULL;
|
|
tp->retransmit_skb_hint = NULL;
|
|
tp->forward_skb_hint = NULL;
|
|
tp->fastpath_skb_hint = NULL;
|
|
}
|
|
|
|
/* /proc */
|
|
enum tcp_seq_states {
|
|
TCP_SEQ_STATE_LISTENING,
|
|
TCP_SEQ_STATE_OPENREQ,
|
|
TCP_SEQ_STATE_ESTABLISHED,
|
|
TCP_SEQ_STATE_TIME_WAIT,
|
|
};
|
|
|
|
struct tcp_seq_afinfo {
|
|
struct module *owner;
|
|
char *name;
|
|
sa_family_t family;
|
|
int (*seq_show) (struct seq_file *m, void *v);
|
|
struct file_operations *seq_fops;
|
|
};
|
|
|
|
struct tcp_iter_state {
|
|
sa_family_t family;
|
|
enum tcp_seq_states state;
|
|
struct sock *syn_wait_sk;
|
|
int bucket, sbucket, num, uid;
|
|
struct seq_operations seq_ops;
|
|
};
|
|
|
|
extern int tcp_proc_register(struct tcp_seq_afinfo *afinfo);
|
|
extern void tcp_proc_unregister(struct tcp_seq_afinfo *afinfo);
|
|
|
|
extern struct request_sock_ops tcp_request_sock_ops;
|
|
|
|
extern int tcp_v4_destroy_sock(struct sock *sk);
|
|
|
|
extern int tcp_v4_gso_send_check(struct sk_buff *skb);
|
|
extern struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
extern int tcp4_proc_init(void);
|
|
extern void tcp4_proc_exit(void);
|
|
#endif
|
|
|
|
extern void tcp_v4_init(struct net_proto_family *ops);
|
|
extern void tcp_init(void);
|
|
|
|
#endif /* _TCP_H */
|