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 * Project: S.Ha.R.K.
 * Coordinators:
 *   Giorgio Buttazzo    <>
 *   Paolo Gai           <>
 * Authors     :
 *   Paolo Gai           <>
 *   Massimiliano Giorgi <>
 *   Luca Abeni          <>
 *   (see the web pages for full authors list)
 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)

 CVS :        $Id: sock.h,v 1.1 2004-05-11 14:32:02 giacomo Exp $

 File:        $File$
 Revision:    $Revision: 1.1 $
 Last update: $Date: 2004-05-11 14:32:02 $

 * Copyright (C) 2000 Paolo Gai, Luca Abeni
 * 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.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef __SOCK__
#define __SOCK__

#include <linux/timer.h>

#include <linux/netdevice.h>
#include <linux/skbuff.h>       /* struct sk_buff */

#include <arch/sys/cdefs.h>


 * This structure really needs to be cleaned up.
 * Most of it is for TCP, and not used by any of
 * the other protocols.

struct sock
        /* This must be first. */
        struct sock             *sklist_next;
        struct sock             *sklist_prev;

        struct options          *opt;
        atomic_t                wmem_alloc;
        atomic_t                rmem_alloc;
        unsigned long           allocation;             /* Allocation mode */
        __u32                   write_seq;
        __u32                   sent_seq;
        __u32                   acked_seq;
        __u32                   copied_seq;
        __u32                   rcv_ack_seq;
        unsigned short          rcv_ack_cnt;            /* count of same ack */
        __u32                   window_seq;
        __u32                   fin_seq;
        __u32                   urg_seq;
        __u32                   urg_data;
        __u32                   syn_seq;
        int                     users;                  /* user count */
   *    Not all are volatile, but some are, so we
   *    might as well say they all are.

        volatile char           dead,
                                zapped, /* In ax25 & ipx means not linked */
        unsigned long           lingertime;
        int                     proc;

        struct sock             *next;
        struct sock             **pprev;
        struct sock             *bind_next;
        struct sock             **bind_pprev;
        struct sock             *pair;
        int                     hashent;
        struct sock             *prev;
        struct sk_buff          * volatile send_head;
        struct sk_buff          * volatile send_next;
        struct sk_buff          * volatile send_tail;
        struct sk_buff_head     back_log;
        struct sk_buff          *partial;
        struct timer_list       partial_timer;
        long                    retransmits;
        struct sk_buff_head     write_queue,
        struct proto            *prot;
        struct wait_queue       **sleep;
        __u32                   daddr;
        __u32                   saddr;          /* Sending source */
        __u32                   rcv_saddr;      /* Bound address */
        unsigned short          max_unacked;
        unsigned short          window;
        __u32                   lastwin_seq;    /* sequence number when we last updated the window we offer */
        __u32                   high_seq;       /* sequence number when we did current fast retransmit */
        volatile unsigned long  ato;            /* ack timeout */
        volatile unsigned long  lrcvtime;       /* jiffies at last data rcv */
        volatile unsigned long  idletime;       /* jiffies at last rcv */
        unsigned int            bytes_rcv;
 *      mss is min(mtu, max_window)

        unsigned short          mtu;       /* mss negotiated in the syn's */
        volatile unsigned short mss;       /* current eff. mss - can change */
        volatile unsigned short user_mss;  /* mss requested by user in ioctl */
        volatile unsigned short max_window;
        unsigned long           window_clamp;
        unsigned int            ssthresh;
        unsigned short          num;
        volatile unsigned short cong_window;
        volatile unsigned short cong_count;
        volatile unsigned short packets_out;
        volatile unsigned short shutdown;
        volatile unsigned long  rtt;
        volatile unsigned long  mdev;
        volatile unsigned long  rto;

 *      currently backoff isn't used, but I'm maintaining it in case
 *      we want to go back to a backoff formula that needs it

        volatile unsigned short backoff;
        int                     err, err_soft;  /* Soft holds errors that don't
                                                   cause failure but are the cause
                                                   of a persistent failure not just
                                                   'timed out' */

        unsigned char           protocol;
        volatile unsigned char  state;
        unsigned char           ack_backlog;
        unsigned char           max_ack_backlog;
        unsigned char           priority;
        unsigned char           debug;
        int                     rcvbuf;
        int                     sndbuf;
        unsigned short          type;
        unsigned char           localroute;     /* Route locally only */
#if 0
 *      This is where all the private (optional) areas that don't
 *      overlap will eventually live.

                struct unix_opt af_unix;
                struct inet_packet_opt  af_packet;
#ifdef CONFIG_NUTCP            
                struct tcp_opt          af_tcp;
        } protinfo;            
 *      IP 'private area' or will be eventually

        int                     ip_ttl;                 /* TTL setting */
        int                     ip_tos;                 /* TOS */
//      struct tcphdr           dummy_th;
        struct timer_list       keepalive_timer;        /* TCP keepalive hack */
        struct timer_list       retransmit_timer;       /* TCP retransmit timer */
        struct timer_list       delack_timer;           /* TCP delayed ack timer */
        int                     ip_xmit_timeout;        /* Why the timeout is running */
        struct rtable           *ip_route_cache;        /* Cached output route */
        unsigned char           ip_hdrincl;             /* Include headers ? */
        int                     ip_mc_ttl;              /* Multicasting TTL */
        int                     ip_mc_loop;             /* Loopback */
        char                    ip_mc_name[MAX_ADDR_LEN];/* Multicast device name */
        struct ip_mc_socklist   *ip_mc_list;            /* Group array */

 *      This part is used for the timeout functions (timer.c).

        int                     timeout;        /* What are we waiting for? */
        struct timer_list       timer;          /* This is the TIME_WAIT/receive timer
                                         * when we are doing IP

//      struct timeval          stamp;

  *     Identd

        struct socket           *socket;
   *    Callbacks

        void                    (*state_change)(struct sock *sk);
        void                    (*data_ready)(struct sock *sk,int bytes);
        void                    (*write_space)(struct sock *sk);
        void                    (*error_report)(struct sock *sk);