1 files changed, 448 insertions, 0 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
new file mode 100644
index 000000000000..14a55e3e3a50
--- /dev/null
+++ b/include/linux/tcp.h
@@ -0,0 +1,448 @@
+/*
+ * 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 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;
+};
+
+enum tcp_congestion_algo {
+        TCP_RENO=0,
+        TCP_VEGAS,
+        TCP_WESTWOOD,
+        TCP_BIC,
+};
+
+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_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    adv_cong;       /* Using Vegas, Westwood, or BIC */
+        __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 */
+
+        /* The syn_wait_lock is necessary only to avoid proc interface having
+         * to grab the main lock sock while browsing the listening hash
+         * (otherwise it's deadlock prone).
+         * This lock is acquired in read mode only from listening_get_next()
+         * and it's acquired in write mode _only_ from code that is actively
+         * changing the syn_wait_queue. All readers that are holding
+         * the master sock lock don't need to grab this lock in read mode
+         * too as the syn_wait_queue writes are always protected from
+         * the main sock lock.
+         */
+        rwlock_t                syn_wait_lock;
+        struct tcp_listen_opt   *listen_opt;
+
+        /* FIFO of established children */
+        struct open_request     *accept_queue;
+        struct open_request     *accept_queue_tail;
+
+        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;
+
+/* TCP Westwood structure */
+        struct {
+                __u32    bw_ns_est;        /* first bandwidth estimation..not too smoothed 8) */
+                __u32    bw_est;           /* bandwidth estimate */
+                __u32    rtt_win_sx;       /* here starts a new evaluation... */
+                __u32    bk;
+                __u32    snd_una;          /* used for evaluating the number of acked bytes */
+                __u32    cumul_ack;
+                __u32    accounted;
+                __u32    rtt;
+                __u32    rtt_min;          /* minimum observed RTT */
+        } westwood;
+
+/* Vegas variables */
+        struct {
+                __u32   beg_snd_nxt;    /* right edge during last RTT */
+                __u32   beg_snd_una;    /* left edge  during last RTT */
+                __u32   beg_snd_cwnd;   /* saves the size of the cwnd */
+                __u8    doing_vegas_now;/* if true, do vegas for this RTT */
+                __u16   cntRTT;         /* # of RTTs measured within last RTT */
+                __u32   minRTT;         /* min of RTTs measured within last RTT (in usec) */
+                __u32   baseRTT;        /* the min of all Vegas RTT measurements seen (in usec) */
+        } vegas;
+
+        /* BI TCP Parameters */
+        struct {
+                __u32   cnt;            /* increase cwnd by 1 after this number of ACKs */
+                __u32   last_max_cwnd;  /* last maximium snd_cwnd */
+                __u32   last_cwnd;      /* the last snd_cwnd */
+                __u32   last_stamp;     /* time when updated last_cwnd */
+        } bictcp;
+};
+
+static inline struct tcp_sock *tcp_sk(const struct sock *sk)
+{
+        return (struct tcp_sock *)sk;
+}
+
+#endif
+
+#endif  /* _LINUX_TCP_H */