Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
new file mode 100644
index 0000000..14a55e3
--- /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 */