forked from luck/tmp_suning_uos_patched
5f8ef48d24
Allow using setsockopt to set TCP congestion control to use on a per socket basis. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
417 lines
12 KiB
C
417 lines
12 KiB
C
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* Definitions for the TCP protocol.
|
|
*
|
|
* Version: @(#)tcp.h 1.0.2 04/28/93
|
|
*
|
|
* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#ifndef _LINUX_TCP_H
|
|
#define _LINUX_TCP_H
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/byteorder.h>
|
|
|
|
struct tcphdr {
|
|
__u16 source;
|
|
__u16 dest;
|
|
__u32 seq;
|
|
__u32 ack_seq;
|
|
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
|
__u16 res1:4,
|
|
doff:4,
|
|
fin:1,
|
|
syn:1,
|
|
rst:1,
|
|
psh:1,
|
|
ack:1,
|
|
urg:1,
|
|
ece:1,
|
|
cwr:1;
|
|
#elif defined(__BIG_ENDIAN_BITFIELD)
|
|
__u16 doff:4,
|
|
res1:4,
|
|
cwr:1,
|
|
ece:1,
|
|
urg:1,
|
|
ack:1,
|
|
psh:1,
|
|
rst:1,
|
|
syn:1,
|
|
fin:1;
|
|
#else
|
|
#error "Adjust your <asm/byteorder.h> defines"
|
|
#endif
|
|
__u16 window;
|
|
__u16 check;
|
|
__u16 urg_ptr;
|
|
};
|
|
|
|
|
|
enum {
|
|
TCP_ESTABLISHED = 1,
|
|
TCP_SYN_SENT,
|
|
TCP_SYN_RECV,
|
|
TCP_FIN_WAIT1,
|
|
TCP_FIN_WAIT2,
|
|
TCP_TIME_WAIT,
|
|
TCP_CLOSE,
|
|
TCP_CLOSE_WAIT,
|
|
TCP_LAST_ACK,
|
|
TCP_LISTEN,
|
|
TCP_CLOSING, /* now a valid state */
|
|
|
|
TCP_MAX_STATES /* Leave at the end! */
|
|
};
|
|
|
|
#define TCP_STATE_MASK 0xF
|
|
#define TCP_ACTION_FIN (1 << 7)
|
|
|
|
enum {
|
|
TCPF_ESTABLISHED = (1 << 1),
|
|
TCPF_SYN_SENT = (1 << 2),
|
|
TCPF_SYN_RECV = (1 << 3),
|
|
TCPF_FIN_WAIT1 = (1 << 4),
|
|
TCPF_FIN_WAIT2 = (1 << 5),
|
|
TCPF_TIME_WAIT = (1 << 6),
|
|
TCPF_CLOSE = (1 << 7),
|
|
TCPF_CLOSE_WAIT = (1 << 8),
|
|
TCPF_LAST_ACK = (1 << 9),
|
|
TCPF_LISTEN = (1 << 10),
|
|
TCPF_CLOSING = (1 << 11)
|
|
};
|
|
|
|
/*
|
|
* The union cast uses a gcc extension to avoid aliasing problems
|
|
* (union is compatible to any of its members)
|
|
* This means this part of the code is -fstrict-aliasing safe now.
|
|
*/
|
|
union tcp_word_hdr {
|
|
struct tcphdr hdr;
|
|
__u32 words[5];
|
|
};
|
|
|
|
#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
|
|
|
|
enum {
|
|
TCP_FLAG_CWR = __constant_htonl(0x00800000),
|
|
TCP_FLAG_ECE = __constant_htonl(0x00400000),
|
|
TCP_FLAG_URG = __constant_htonl(0x00200000),
|
|
TCP_FLAG_ACK = __constant_htonl(0x00100000),
|
|
TCP_FLAG_PSH = __constant_htonl(0x00080000),
|
|
TCP_FLAG_RST = __constant_htonl(0x00040000),
|
|
TCP_FLAG_SYN = __constant_htonl(0x00020000),
|
|
TCP_FLAG_FIN = __constant_htonl(0x00010000),
|
|
TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
|
|
TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
|
|
};
|
|
|
|
/* TCP socket options */
|
|
#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
|
|
#define TCP_MAXSEG 2 /* Limit MSS */
|
|
#define TCP_CORK 3 /* Never send partially complete segments */
|
|
#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
|
|
#define TCP_KEEPINTVL 5 /* Interval between keepalives */
|
|
#define TCP_KEEPCNT 6 /* Number of keepalives before death */
|
|
#define TCP_SYNCNT 7 /* Number of SYN retransmits */
|
|
#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
|
|
#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
|
|
#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
|
|
#define TCP_INFO 11 /* Information about this connection. */
|
|
#define TCP_QUICKACK 12 /* Block/reenable quick acks */
|
|
#define TCP_CONGESTION 13 /* Congestion control algorithm */
|
|
|
|
#define TCPI_OPT_TIMESTAMPS 1
|
|
#define TCPI_OPT_SACK 2
|
|
#define TCPI_OPT_WSCALE 4
|
|
#define TCPI_OPT_ECN 8
|
|
|
|
enum tcp_ca_state
|
|
{
|
|
TCP_CA_Open = 0,
|
|
#define TCPF_CA_Open (1<<TCP_CA_Open)
|
|
TCP_CA_Disorder = 1,
|
|
#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
|
|
TCP_CA_CWR = 2,
|
|
#define TCPF_CA_CWR (1<<TCP_CA_CWR)
|
|
TCP_CA_Recovery = 3,
|
|
#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
|
|
TCP_CA_Loss = 4
|
|
#define TCPF_CA_Loss (1<<TCP_CA_Loss)
|
|
};
|
|
|
|
struct tcp_info
|
|
{
|
|
__u8 tcpi_state;
|
|
__u8 tcpi_ca_state;
|
|
__u8 tcpi_retransmits;
|
|
__u8 tcpi_probes;
|
|
__u8 tcpi_backoff;
|
|
__u8 tcpi_options;
|
|
__u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
|
|
|
|
__u32 tcpi_rto;
|
|
__u32 tcpi_ato;
|
|
__u32 tcpi_snd_mss;
|
|
__u32 tcpi_rcv_mss;
|
|
|
|
__u32 tcpi_unacked;
|
|
__u32 tcpi_sacked;
|
|
__u32 tcpi_lost;
|
|
__u32 tcpi_retrans;
|
|
__u32 tcpi_fackets;
|
|
|
|
/* Times. */
|
|
__u32 tcpi_last_data_sent;
|
|
__u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
|
|
__u32 tcpi_last_data_recv;
|
|
__u32 tcpi_last_ack_recv;
|
|
|
|
/* Metrics. */
|
|
__u32 tcpi_pmtu;
|
|
__u32 tcpi_rcv_ssthresh;
|
|
__u32 tcpi_rtt;
|
|
__u32 tcpi_rttvar;
|
|
__u32 tcpi_snd_ssthresh;
|
|
__u32 tcpi_snd_cwnd;
|
|
__u32 tcpi_advmss;
|
|
__u32 tcpi_reordering;
|
|
|
|
__u32 tcpi_rcv_rtt;
|
|
__u32 tcpi_rcv_space;
|
|
|
|
__u32 tcpi_total_retrans;
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/ip.h>
|
|
#include <net/sock.h>
|
|
|
|
/* This defines a selective acknowledgement block. */
|
|
struct tcp_sack_block {
|
|
__u32 start_seq;
|
|
__u32 end_seq;
|
|
};
|
|
|
|
struct tcp_options_received {
|
|
/* PAWS/RTTM data */
|
|
long ts_recent_stamp;/* Time we stored ts_recent (for aging) */
|
|
__u32 ts_recent; /* Time stamp to echo next */
|
|
__u32 rcv_tsval; /* Time stamp value */
|
|
__u32 rcv_tsecr; /* Time stamp echo reply */
|
|
__u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */
|
|
tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */
|
|
dsack : 1, /* D-SACK is scheduled */
|
|
wscale_ok : 1, /* Wscale seen on SYN packet */
|
|
sack_ok : 4, /* SACK seen on SYN packet */
|
|
snd_wscale : 4, /* Window scaling received from sender */
|
|
rcv_wscale : 4; /* Window scaling to send to receiver */
|
|
/* SACKs data */
|
|
__u8 eff_sacks; /* Size of SACK array to send with next packet */
|
|
__u8 num_sacks; /* Number of SACK blocks */
|
|
__u16 user_mss; /* mss requested by user in ioctl */
|
|
__u16 mss_clamp; /* Maximal mss, negotiated at connection setup */
|
|
};
|
|
|
|
struct tcp_request_sock {
|
|
struct inet_request_sock req;
|
|
__u32 rcv_isn;
|
|
__u32 snt_isn;
|
|
};
|
|
|
|
static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
|
|
{
|
|
return (struct tcp_request_sock *)req;
|
|
}
|
|
|
|
struct tcp_sock {
|
|
/* inet_sock has to be the first member of tcp_sock */
|
|
struct inet_sock inet;
|
|
int tcp_header_len; /* Bytes of tcp header to send */
|
|
|
|
/*
|
|
* Header prediction flags
|
|
* 0x5?10 << 16 + snd_wnd in net byte order
|
|
*/
|
|
__u32 pred_flags;
|
|
|
|
/*
|
|
* RFC793 variables by their proper names. This means you can
|
|
* read the code and the spec side by side (and laugh ...)
|
|
* See RFC793 and RFC1122. The RFC writes these in capitals.
|
|
*/
|
|
__u32 rcv_nxt; /* What we want to receive next */
|
|
__u32 snd_nxt; /* Next sequence we send */
|
|
|
|
__u32 snd_una; /* First byte we want an ack for */
|
|
__u32 snd_sml; /* Last byte of the most recently transmitted small packet */
|
|
__u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */
|
|
__u32 lsndtime; /* timestamp of last sent data packet (for restart window) */
|
|
struct tcp_bind_bucket *bind_hash;
|
|
/* Delayed ACK control data */
|
|
struct {
|
|
__u8 pending; /* ACK is pending */
|
|
__u8 quick; /* Scheduled number of quick acks */
|
|
__u8 pingpong; /* The session is interactive */
|
|
__u8 blocked; /* Delayed ACK was blocked by socket lock*/
|
|
__u32 ato; /* Predicted tick of soft clock */
|
|
unsigned long timeout; /* Currently scheduled timeout */
|
|
__u32 lrcvtime; /* timestamp of last received data packet*/
|
|
__u16 last_seg_size; /* Size of last incoming segment */
|
|
__u16 rcv_mss; /* MSS used for delayed ACK decisions */
|
|
} ack;
|
|
|
|
/* Data for direct copy to user */
|
|
struct {
|
|
struct sk_buff_head prequeue;
|
|
struct task_struct *task;
|
|
struct iovec *iov;
|
|
int memory;
|
|
int len;
|
|
} ucopy;
|
|
|
|
__u32 snd_wl1; /* Sequence for window update */
|
|
__u32 snd_wnd; /* The window we expect to receive */
|
|
__u32 max_window; /* Maximal window ever seen from peer */
|
|
__u32 pmtu_cookie; /* Last pmtu seen by socket */
|
|
__u32 mss_cache; /* Cached effective mss, not including SACKS */
|
|
__u16 mss_cache_std; /* Like mss_cache, but without TSO */
|
|
__u16 ext_header_len; /* Network protocol overhead (IP/IPv6 options) */
|
|
__u8 ca_state; /* State of fast-retransmit machine */
|
|
__u8 retransmits; /* Number of unrecovered RTO timeouts. */
|
|
|
|
__u16 advmss; /* Advertised MSS */
|
|
__u32 window_clamp; /* Maximal window to advertise */
|
|
__u32 rcv_ssthresh; /* Current window clamp */
|
|
|
|
__u32 frto_highmark; /* snd_nxt when RTO occurred */
|
|
__u8 reordering; /* Packet reordering metric. */
|
|
__u8 frto_counter; /* Number of new acks after RTO */
|
|
|
|
__u8 unused;
|
|
__u8 defer_accept; /* User waits for some data after accept() */
|
|
|
|
/* RTT measurement */
|
|
__u32 srtt; /* smoothed round trip time << 3 */
|
|
__u32 mdev; /* medium deviation */
|
|
__u32 mdev_max; /* maximal mdev for the last rtt period */
|
|
__u32 rttvar; /* smoothed mdev_max */
|
|
__u32 rtt_seq; /* sequence number to update rttvar */
|
|
__u32 rto; /* retransmit timeout */
|
|
|
|
__u32 packets_out; /* Packets which are "in flight" */
|
|
__u32 left_out; /* Packets which leaved network */
|
|
__u32 retrans_out; /* Retransmitted packets out */
|
|
__u8 backoff; /* backoff */
|
|
/*
|
|
* Options received (usually on last packet, some only on SYN packets).
|
|
*/
|
|
__u8 nonagle; /* Disable Nagle algorithm? */
|
|
__u8 keepalive_probes; /* num of allowed keep alive probes */
|
|
|
|
__u8 probes_out; /* unanswered 0 window probes */
|
|
struct tcp_options_received rx_opt;
|
|
|
|
/*
|
|
* Slow start and congestion control (see also Nagle, and Karn & Partridge)
|
|
*/
|
|
__u32 snd_ssthresh; /* Slow start size threshold */
|
|
__u32 snd_cwnd; /* Sending congestion window */
|
|
__u16 snd_cwnd_cnt; /* Linear increase counter */
|
|
__u16 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
|
|
__u32 snd_cwnd_used;
|
|
__u32 snd_cwnd_stamp;
|
|
|
|
/* Two commonly used timers in both sender and receiver paths. */
|
|
unsigned long timeout;
|
|
struct timer_list retransmit_timer; /* Resend (no ack) */
|
|
struct timer_list delack_timer; /* Ack delay */
|
|
|
|
struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
|
|
|
|
struct tcp_func *af_specific; /* Operations which are AF_INET{4,6} specific */
|
|
|
|
__u32 rcv_wnd; /* Current receiver window */
|
|
__u32 rcv_wup; /* rcv_nxt on last window update sent */
|
|
__u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
|
|
__u32 pushed_seq; /* Last pushed seq, required to talk to windows */
|
|
__u32 copied_seq; /* Head of yet unread data */
|
|
|
|
/* SACKs data */
|
|
struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
|
|
struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
|
|
|
|
__u8 syn_retries; /* num of allowed syn retries */
|
|
__u8 ecn_flags; /* ECN status bits. */
|
|
__u16 prior_ssthresh; /* ssthresh saved at recovery start */
|
|
__u32 lost_out; /* Lost packets */
|
|
__u32 sacked_out; /* SACK'd packets */
|
|
__u32 fackets_out; /* FACK'd packets */
|
|
__u32 high_seq; /* snd_nxt at onset of congestion */
|
|
|
|
__u32 retrans_stamp; /* Timestamp of the last retransmit,
|
|
* also used in SYN-SENT to remember stamp of
|
|
* the first SYN. */
|
|
__u32 undo_marker; /* tracking retrans started here. */
|
|
int undo_retrans; /* number of undoable retransmissions. */
|
|
__u32 urg_seq; /* Seq of received urgent pointer */
|
|
__u16 urg_data; /* Saved octet of OOB data and control flags */
|
|
__u8 pending; /* Scheduled timer event */
|
|
__u8 urg_mode; /* In urgent mode */
|
|
__u32 snd_up; /* Urgent pointer */
|
|
|
|
__u32 total_retrans; /* Total retransmits for entire connection */
|
|
|
|
struct request_sock_queue accept_queue; /* FIFO of established children */
|
|
|
|
unsigned int keepalive_time; /* time before keep alive takes place */
|
|
unsigned int keepalive_intvl; /* time interval between keep alive probes */
|
|
int linger2;
|
|
|
|
unsigned long last_synq_overflow;
|
|
|
|
/* Receiver side RTT estimation */
|
|
struct {
|
|
__u32 rtt;
|
|
__u32 seq;
|
|
__u32 time;
|
|
} rcv_rtt_est;
|
|
|
|
/* Receiver queue space */
|
|
struct {
|
|
int space;
|
|
__u32 seq;
|
|
__u32 time;
|
|
} rcvq_space;
|
|
|
|
/* Pluggable TCP congestion control hook */
|
|
struct tcp_congestion_ops *ca_ops;
|
|
u32 ca_priv[16];
|
|
#define TCP_CA_PRIV_SIZE (16*sizeof(u32))
|
|
};
|
|
|
|
static inline struct tcp_sock *tcp_sk(const struct sock *sk)
|
|
{
|
|
return (struct tcp_sock *)sk;
|
|
}
|
|
|
|
static inline void *tcp_ca(const struct tcp_sock *tp)
|
|
{
|
|
return (void *) tp->ca_priv;
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* _LINUX_TCP_H */
|