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//==========================================================================

//

//      include/sys/socketvar.h

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD, 

// FreeBSD or other sources, and are covered by the appropriate

// copyright disclaimers included herein.

//

// Portions created by Red Hat are

// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.

//

// -------------------------------------------

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//####BSDCOPYRIGHTEND####

//==========================================================================

/*-

 * Copyright (c) 1982, 1986, 1990, 1993

 *      The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *      @(#)socketvar.h 8.3 (Berkeley) 2/19/95

 * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.6 2001/08/31 13:45:49 jlemon Exp $

 */

#ifndef _SYS_SOCKETVAR_H_

#define _SYS_SOCKETVAR_H_

#include <sys/queue.h>                  /* for TAILQ macros */

/*

 * Kernel structure per socket.

 * Contains send and receive buffer queues,

 * handle on protocol and pointer to protocol

 * private data and error information.

 */

typedef u_quad_t so_gen_t;

struct accept_filter;

struct socket {

        struct  vm_zone *so_zone;       /* zone we were allocated from */

        short   so_type;                /* generic type, see socket.h */

        short   so_options;             /* from socket call, see socket.h */

        short   so_linger;              /* time to linger while closing */

        short   so_state;               /* internal state flags SS_*, below */

        caddr_t so_pcb;                 /* protocol control block */

        struct  protosw *so_proto;      /* protocol handle */

/*

 * Variables for connection queuing.

 * Socket where accepts occur is so_head in all subsidiary sockets.

 * If so_head is 0, socket is not related to an accept.

 * For head socket so_incomp queues partially completed connections,

 * while so_comp is a queue of connections ready to be accepted.

 * If a connection is aborted and it has so_head set, then

 * it has to be pulled out of either so_incomp or so_comp.

 * We allow connections to queue up based on current queue lengths

 * and limit on number of queued connections for this socket.

 */

        struct  socket *so_head;        /* back pointer to accept socket */

        TAILQ_HEAD(, socket) so_incomp; /* queue of partial unaccepted connections */

        TAILQ_HEAD(, socket) so_comp;   /* queue of complete unaccepted connections */

        TAILQ_ENTRY(socket) so_list;    /* list of unaccepted connections */

        short   so_qlen;                /* number of unaccepted connections */

        short   so_incqlen;             /* number of unaccepted incomplete

                                           connections */

        short   so_qlimit;              /* max number queued connections */

        short   so_timeo;               /* connection timeout */

        u_short so_error;               /* error affecting connection */

        struct  sigio *so_sigio;        /* information for async I/O or

                                           out of band data (SIGURG) */

        u_long  so_oobmark;             /* chars to oob mark */

        TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */

/*

 * Variables for socket buffering.

 */

        struct  sockbuf {

                u_long  sb_cc;          /* actual chars in buffer */

                u_long  sb_hiwat;       /* max actual char count */

                u_long  sb_mbcnt;       /* chars of mbufs used */

                u_long  sb_mbmax;       /* max chars of mbufs to use */

                long    sb_lowat;       /* low water mark */

                struct  mbuf *sb_mb;    /* the mbuf chain */

                struct  selinfo sb_sel; /* process selecting read/write */

                short   sb_flags;       /* flags, see below */

                short   sb_timeo;       /* timeout for read/write */

        } so_rcv, so_snd;

#define SB_MAX          (256*1024)      /* default for max chars in sockbuf */

#define SB_LOCK         0x01            /* lock on data queue */

#define SB_WANT         0x02            /* someone is waiting to lock */

#define SB_WAIT         0x04            /* someone is waiting for data/space */

#define SB_SEL          0x08            /* someone is selecting */

#define SB_ASYNC        0x10            /* ASYNC I/O, need signals */

#define SB_UPCALL       0x20            /* someone wants an upcall */

#define SB_NOINTR       0x40            /* operations not interruptible */

#define SB_AIO          0x80            /* AIO operations queued */

#define SB_KNOTE        0x100           /* kernel note attached */

        void    (*so_upcall) __P((struct socket *, void *, int));

        void    *so_upcallarg;

        struct  ucred *so_cred;         /* user credentials */

        /* NB: generation count must not be first; easiest to make it last. */

        so_gen_t so_gencnt;             /* generation count */

        void    *so_emuldata;           /* private data for emulators */

        struct  so_accf {

                struct  accept_filter *so_accept_filter;

                void    *so_accept_filter_arg;  /* saved filter args */

                char    *so_accept_filter_str;  /* saved user args */

        } *so_accf;

};

/*

 * Socket state bits.

 */

#define SS_NOFDREF              0x0001  /* no file table ref any more */

#define SS_ISCONNECTED          0x0002  /* socket connected to a peer */

#define SS_ISCONNECTING         0x0004  /* in process of connecting to peer */

#define SS_ISDISCONNECTING      0x0008  /* in process of disconnecting */

#define SS_CANTSENDMORE         0x0010  /* can't send more data to peer */

#define SS_CANTRCVMORE          0x0020  /* can't receive more data from peer */

#define SS_RCVATMARK            0x0040  /* at mark on input */

#define SS_NBIO                 0x0100  /* non-blocking ops */

#define SS_ASYNC                0x0200  /* async i/o notify */

#define SS_ISCONFIRMING         0x0400  /* deciding to accept connection req */

#define SS_INCOMP               0x0800  /* unaccepted, incomplete connection */

#define SS_COMP                 0x1000  /* unaccepted, complete connection */

#define SS_ISDISCONNECTED       0x2000  /* socket disconnected from peer */

/*

 * Externalized form of struct socket used by the sysctl(3) interface.

 */

struct  xsocket {

        size_t  xso_len;        /* length of this structure */

        struct  socket *xso_so; /* makes a convenient handle sometimes */

        short   so_type;

        short   so_options;

        short   so_linger;

        short   so_state;

        caddr_t so_pcb;         /* another convenient handle */

        int     xso_protocol;

        int     xso_family;

        short   so_qlen;

        short   so_incqlen;

        short   so_qlimit;

        short   so_timeo;

        u_short so_error;

        pid_t   so_pgid;

        u_long  so_oobmark;

        struct  xsockbuf {

                u_long  sb_cc;

                u_long  sb_hiwat;

                u_long  sb_mbcnt;

                u_long  sb_mbmax;

                long    sb_lowat;

                short   sb_flags;

                short   sb_timeo;

        } so_rcv, so_snd;

        uid_t   so_uid;         /* XXX */

};

/*

 * Macros for sockets and socket buffering.

 */

/*

 * Do we need to notify the other side when I/O is possible?

 */

#define sb_notify(sb)   (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \

    SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)

/*

 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?

 * This is problematical if the fields are unsigned, as the space might

 * still be negative (cc > hiwat or mbcnt > mbmax).  Should detect

 * overflow and return 0.  Should use "lmin" but it doesn't exist now.

 */

#define sbspace(sb) \

    ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \

         (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))

/* do we have to send all at once on a socket? */

#define sosendallatonce(so) \

    ((so)->so_proto->pr_flags & PR_ATOMIC)

/* can we read something from so? */

#define soreadable(so) \

    ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \

        ((so)->so_state & SS_CANTRCVMORE) || \

        (so)->so_comp.tqh_first || (so)->so_error)

/* can we write something to so? */

#define sowriteable(so) \

    ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \

        (((so)->so_state&SS_ISCONNECTED) || \

          ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \

     ((so)->so_state & SS_CANTSENDMORE) || \

     (so)->so_error)

/* adjust counters in sb reflecting allocation of m */

#define sballoc(sb, m) { \

        (sb)->sb_cc += (m)->m_len; \

        (sb)->sb_mbcnt += MSIZE; \

        if ((m)->m_flags & M_EXT) \

                (sb)->sb_mbcnt += (m)->m_ext.ext_size; \

}

/* adjust counters in sb reflecting freeing of m */

#define sbfree(sb, m) { \

        (sb)->sb_cc -= (m)->m_len; \

        (sb)->sb_mbcnt -= MSIZE; \

        if ((m)->m_flags & M_EXT) \

                (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \

}

/*

 * Set lock on sockbuf sb; sleep if lock is already held.

 * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.

 * Returns error without lock if sleep is interrupted.

 */

#define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \

                (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \

                ((sb)->sb_flags |= SB_LOCK), 0)

/* release lock on sockbuf sb */

#define sbunlock(sb) { \

        (sb)->sb_flags &= ~SB_LOCK; \

        if ((sb)->sb_flags & SB_WANT) { \

                (sb)->sb_flags &= ~SB_WANT; \

                wakeup((caddr_t)&(sb)->sb_flags); \

        } \

}

#define sorwakeup(so)   do { \

                          if (sb_notify(&(so)->so_rcv)) \

                            sowakeup((so), &(so)->so_rcv); \

                        } while (0)

#define sowwakeup(so)   do { \

                          if (sb_notify(&(so)->so_snd)) \

                            sowakeup((so), &(so)->so_snd); \

                        } while (0)

#ifdef _KERNEL

/*

 * Argument structure for sosetopt et seq.  This is in the KERNEL

 * section because it will never be visible to user code.

 */

enum sopt_dir { SOPT_GET, SOPT_SET };

struct sockopt {

        enum    sopt_dir sopt_dir; /* is this a get or a set? */

        int     sopt_level;     /* second arg of [gs]etsockopt */

        int     sopt_name;      /* third arg of [gs]etsockopt */

        void   *sopt_val;       /* fourth arg of [gs]etsockopt */

        size_t  sopt_valsize;   /* (almost) fifth arg of [gs]etsockopt */

        struct  proc *sopt_p;   /* calling process or null if kernel */

};

struct sf_buf {

        SLIST_ENTRY(sf_buf) free_list;  /* list of free buffer slots */

        int             refcnt;         /* reference count */

        struct          vm_page *m;     /* currently mapped page */

        vm_offset_t     kva;            /* va of mapping */

};

struct accept_filter {

        char    accf_name[16];

        void    (*accf_callback)

                __P((struct socket *so, void *arg, int waitflag));

        void *  (*accf_create)

                __P((struct socket *so, char *arg));

        void    (*accf_destroy)

                __P((struct socket *so));

        SLIST_ENTRY(accept_filter) accf_next;   /* next on the list */

};

#ifdef MALLOC_DECLARE

MALLOC_DECLARE(M_PCB);

MALLOC_DECLARE(M_SONAME);

MALLOC_DECLARE(M_ACCF);

#endif

extern int      maxsockets;

extern u_long   sb_max;

extern struct   vm_zone *socket_zone;

extern so_gen_t so_gencnt;

struct file;

struct filedesc;

struct mbuf;

struct sockaddr;

struct stat;

struct ucred;

struct uio;

struct knote;

/*

 * File operations on sockets.

 */

int     soo_read __P((struct file *fp, struct uio *uio, struct ucred *cred,

            int flags, struct proc *p));

int     soo_write __P((struct file *fp, struct uio *uio, struct ucred *cred,

            int flags, struct proc *p));

int     soo_close __P((struct file *fp, struct proc *p));

int     soo_ioctl __P((struct file *fp, u_long cmd, caddr_t data,

            struct proc *p));

int     soo_poll __P((struct file *fp, int events, struct ucred *cred,

            struct proc *p));

int     soo_stat __P((struct file *fp, struct stat *ub, struct proc *p));

int     sokqfilter __P((struct file *fp, struct knote *kn));

/*

 * From uipc_socket and friends

 */

struct  sockaddr *dup_sockaddr __P((struct sockaddr *sa, int canwait));

int     holdsock __P((struct filedesc *fdp, int fdes, struct file **fpp));

int     sockargs __P((struct mbuf **mp, caddr_t buf, int buflen, int type));

void    sbappend __P((struct sockbuf *sb, struct mbuf *m));

int     sbappendaddr __P((struct sockbuf *sb, struct sockaddr *asa,

            struct mbuf *m0, struct mbuf *control));

int     sbappendcontrol __P((struct sockbuf *sb, struct mbuf *m0,

            struct mbuf *control));

void    sbappendrecord __P((struct sockbuf *sb, struct mbuf *m0));

void    sbcheck __P((struct sockbuf *sb));

void    sbcompress __P((struct sockbuf *sb, struct mbuf *m, struct mbuf *n));

struct mbuf *

        sbcreatecontrol __P((caddr_t p, int size, int type, int level));

void    sbdrop __P((struct sockbuf *sb, int len));

void    sbdroprecord __P((struct sockbuf *sb));

void    sbflush __P((struct sockbuf *sb));

void    sbinsertoob __P((struct sockbuf *sb, struct mbuf *m0));

void    sbrelease __P((struct sockbuf *sb, struct socket *so));

int     sbreserve __P((struct sockbuf *sb, u_long cc, struct socket *so,

                       struct proc *p));

void    sbtoxsockbuf __P((struct sockbuf *sb, struct xsockbuf *xsb));

int     sbwait __P((struct sockbuf *sb));

int     sb_lock __P((struct sockbuf *sb));

int     soabort __P((struct socket *so));

int     soaccept __P((struct socket *so, struct sockaddr **nam));

struct  socket *soalloc __P((int waitok));

int     sobind __P((struct socket *so, struct sockaddr *nam, struct proc *p));

void    socantrcvmore __P((struct socket *so));

void    socantsendmore __P((struct socket *so));

int     soclose __P((struct socket *so));

int     soconnect __P((struct socket *so, struct sockaddr *nam, struct proc *p));

int     soconnect2 __P((struct socket *so1, struct socket *so2));

int     socreate __P((int dom, struct socket **aso, int type, int proto,

            struct proc *p));

void    sodealloc __P((struct socket *so));

int     sodisconnect __P((struct socket *so));

void    sofree __P((struct socket *so));

int     sogetopt __P((struct socket *so, struct sockopt *sopt));

void    sohasoutofband __P((struct socket *so));

void    soisconnected __P((struct socket *so));

void    soisconnecting __P((struct socket *so));

void    soisdisconnected __P((struct socket *so));

void    soisdisconnecting __P((struct socket *so));

int     solisten __P((struct socket *so, int backlog, struct proc *p));

struct socket *

        sodropablereq __P((struct socket *head));

struct socket *

        sonewconn __P((struct socket *head, int connstatus));

struct socket *

        sonewconn3 __P((struct socket *head, int connstatus, struct proc *p));

int     sooptcopyin __P((struct sockopt *sopt, void *buf, size_t len,

                         size_t minlen));

int     sooptcopyout __P((struct sockopt *sopt, void *buf, size_t len));

/* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */

int     soopt_getm __P((struct sockopt *sopt, struct mbuf **mp));

int     soopt_mcopyin __P((struct sockopt *sopt, struct mbuf *m));

int     soopt_mcopyout __P((struct sockopt *sopt, struct mbuf *m));

int     sopoll __P((struct socket *so, int events, struct ucred *cred,

                    struct proc *p));

int     soreceive __P((struct socket *so, struct sockaddr **paddr,

                       struct uio *uio, struct mbuf **mp0,

                       struct mbuf **controlp, int *flagsp));

int     soreserve __P((struct socket *so, u_long sndcc, u_long rcvcc));

void    sorflush __P((struct socket *so));

int     sosend __P((struct socket *so, struct sockaddr *addr, struct uio *uio,

                    struct mbuf *top, struct mbuf *control, int flags,

                    struct proc *p));

int     sosetopt __P((struct socket *so, struct sockopt *sopt));

int     soshutdown __P((struct socket *so, int how));

void    sotoxsocket __P((struct socket *so, struct xsocket *xso));

void    sowakeup __P((struct socket *so, struct sockbuf *sb));

/* accept filter functions */

int     accept_filt_add __P((struct accept_filter *filt));

int     accept_filt_del __P((char *name));

struct accept_filter *  accept_filt_get __P((char *name));

#ifdef ACCEPT_FILTER_MOD

int accept_filt_generic_mod_event __P((module_t mod, int event, void *data));

SYSCTL_DECL(_net_inet_accf);

#endif /* ACCEPT_FILTER_MOD */

#endif /* _KERNEL */

#endif /* !_SYS_SOCKETVAR_H_ */