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NetBSD/sys/sys/socketvar.h

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/* $NetBSD: socketvar.h,v 1.80 2004/09/03 18:14:09 darrenr Exp $ */
/*-
* 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. 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
*/
#ifndef _SYS_SOCKETVAR_H_
#define _SYS_SOCKETVAR_H_
#include <sys/select.h> /* for struct selinfo */
#include <sys/queue.h>
#if !defined(_KERNEL) || defined(LKM)
struct uio;
struct proc;
#endif
TAILQ_HEAD(soqhead, socket);
/*
* Variables for socket buffering.
*/
struct sockbuf {
struct selinfo sb_sel; /* process selecting read/write */
struct mowner *sb_mowner; /* who owns data for this sockbuf */
/* When re-zeroing this struct, we zero from sb_startzero to the end */
#define sb_startzero sb_cc
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 mbuf *sb_mbtail; /* the last mbuf in the chain */
struct mbuf *sb_lastrecord; /* first mbuf of last record in
socket buffer */
int sb_flags; /* flags, see below */
int sb_timeo; /* timeout for read/write */
u_long sb_overflowed; /* # of drops due to full buffer */
};
#ifndef SB_MAX
#define SB_MAX (256*1024) /* default for max chars in sockbuf */
#endif
#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 */
/* XXXLUKEM: 0x80 left for FreeBSD's SB_AIO */
#define SB_KNOTE 0x100 /* kernel note attached */
/*
* Kernel structure per socket.
* Contains send and receive buffer queues,
* handle on protocol and pointer to protocol
* private data and error information.
*/
struct socket {
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 */
void *so_pcb; /* protocol control block */
const struct protosw *so_proto; /* protocol handle */
/*
* Variables for connection queueing.
* 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_q0 queues partially completed connections,
* while so_q 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_q0 or so_q.
* 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 */
struct soqhead *so_onq; /* queue (q or q0) that we're on */
struct soqhead so_q0; /* queue of partial connections */
struct soqhead so_q; /* queue of incoming connections */
TAILQ_ENTRY(socket) so_qe; /* our queue entry (q or q0) */
short so_q0len; /* partials on so_q0 */
short so_qlen; /* number of connections on so_q */
short so_qlimit; /* max number queued connections */
short so_timeo; /* connection timeout */
u_short so_error; /* error affecting connection */
pid_t so_pgid; /* pgid for signals */
u_long so_oobmark; /* chars to oob mark */
struct sockbuf so_snd; /* send buffer */
struct sockbuf so_rcv; /* receive buffer */
void *so_internal; /* Space for svr4 stream data */
void (*so_upcall) (struct socket *, caddr_t, int);
caddr_t so_upcallarg; /* Arg for above */
int (*so_send) (struct socket *, struct mbuf *,
struct uio *, struct mbuf *,
struct mbuf *, int, struct proc *);
int (*so_receive) (struct socket *,
struct mbuf **,
struct uio *, struct mbuf **,
struct mbuf **, int *);
struct mowner *so_mowner; /* who owns mbufs for this socket */
uid_t so_uid; /* who opened the socket */
};
#define SB_EMPTY_FIXUP(sb) \
do { \
if ((sb)->sb_mb == NULL) { \
(sb)->sb_mbtail = NULL; \
(sb)->sb_lastrecord = NULL; \
} \
} while (/*CONSTCOND*/0)
/*
* Socket state bits.
*/
#define SS_NOFDREF 0x001 /* no file table ref any more */
#define SS_ISCONNECTED 0x002 /* socket connected to a peer */
#define SS_ISCONNECTING 0x004 /* in process of connecting to peer */
#define SS_ISDISCONNECTING 0x008 /* in process of disconnecting */
#define SS_CANTSENDMORE 0x010 /* can't send more data to peer */
#define SS_CANTRCVMORE 0x020 /* can't receive more data from peer */
#define SS_RCVATMARK 0x040 /* at mark on input */
#define SS_ISDISCONNECTED 0x800 /* socket disconnected from peer */
#define SS_NBIO 0x080 /* non-blocking ops */
#define SS_ASYNC 0x100 /* async i/o notify */
#define SS_ISCONFIRMING 0x200 /* deciding to accept connection req */
#define SS_MORETOCOME 0x400 /*
* hint from sosend to lower layer;
* more data coming
*/
#define SS_ISAPIPE 0x800 /* socket is implementing a pipe */
/*
* 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_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.
*/
#define sbspace(sb) \
(lmin((sb)->sb_hiwat - (sb)->sb_cc, (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_qlen || (so)->so_error)
/* can we write something to so? */
#define sowritable(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) \
do { \
(sb)->sb_cc += (m)->m_len; \
(sb)->sb_mbcnt += MSIZE; \
if ((m)->m_flags & M_EXT) \
(sb)->sb_mbcnt += (m)->m_ext.ext_size; \
} while (/* CONSTCOND */ 0)
/* adjust counters in sb reflecting freeing of m */
#define sbfree(sb, m) \
do { \
(sb)->sb_cc -= (m)->m_len; \
(sb)->sb_mbcnt -= MSIZE; \
if ((m)->m_flags & M_EXT) \
(sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
} while (/* CONSTCOND */ 0)
/*
* 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) \
do { \
(sb)->sb_flags &= ~SB_LOCK; \
if ((sb)->sb_flags & SB_WANT) { \
(sb)->sb_flags &= ~SB_WANT; \
wakeup((caddr_t)&(sb)->sb_flags); \
} \
} while (/* CONSTCOND */ 0)
#define sorwakeup(so) \
do { \
if (sb_notify(&(so)->so_rcv)) \
sowakeup((so), &(so)->so_rcv, POLL_IN); \
} while (/* CONSTCOND */ 0)
#define sowwakeup(so) \
do { \
if (sb_notify(&(so)->so_snd)) \
sowakeup((so), &(so)->so_snd, POLL_OUT); \
} while (/* CONSTCOND */ 0)
#ifdef _KERNEL
extern u_long sb_max;
extern int somaxkva;
/* to catch callers missing new second argument to sonewconn: */
#define sonewconn(head, connstatus) sonewconn1((head), (connstatus))
/* strings for sleep message: */
extern const char netio[], netcon[], netcls[];
extern struct pool socket_pool;
struct mbuf;
struct sockaddr;
struct proc;
struct msghdr;
struct stat;
struct knote;
/*
* File operations on sockets.
*/
int soo_read(struct file *, off_t *, struct uio *, struct ucred *, int);
int soo_write(struct file *, off_t *, struct uio *, struct ucred *, int);
int soo_fcntl(struct file *, u_int cmd, void *, struct proc *);
int soo_ioctl(struct file *, u_long cmd, void *, struct proc *);
int soo_poll(struct file *, int, struct proc *);
int soo_kqfilter(struct file *, struct knote *);
int soo_close(struct file *, struct proc *);
int soo_stat(struct file *, struct stat *, struct proc *);
void sbappend(struct sockbuf *, struct mbuf *);
void sbappendstream(struct sockbuf *, struct mbuf *);
int sbappendaddr(struct sockbuf *, const struct sockaddr *, struct mbuf *,
struct mbuf *);
int sbappendaddrchain(struct sockbuf *, const struct sockaddr *,
struct mbuf *, int);
int sbappendcontrol(struct sockbuf *, struct mbuf *, struct mbuf *);
void sbappendrecord(struct sockbuf *, struct mbuf *);
void sbcheck(struct sockbuf *);
void sbcompress(struct sockbuf *, struct mbuf *, struct mbuf *);
struct mbuf *
sbcreatecontrol(caddr_t, int, int, int);
void sbdrop(struct sockbuf *, int);
void sbdroprecord(struct sockbuf *);
void sbflush(struct sockbuf *);
void sbinsertoob(struct sockbuf *, struct mbuf *);
void sbrelease(struct sockbuf *, struct socket *);
int sbreserve(struct sockbuf *, u_long, struct socket *);
int sbwait(struct sockbuf *);
int sb_lock(struct sockbuf *);
int sb_max_set(u_long);
void soinit(void);
int soabort(struct socket *);
int soaccept(struct socket *, struct mbuf *);
int sobind(struct socket *, struct mbuf *, struct proc *);
void socantrcvmore(struct socket *);
void socantsendmore(struct socket *);
int soclose(struct socket *);
int soconnect(struct socket *, struct mbuf *, struct proc *);
int soconnect2(struct socket *, struct socket *);
int socreate(int, struct socket **, int, int, struct proc *);
int sodisconnect(struct socket *);
void sofree(struct socket *);
int sogetopt(struct socket *, int, int, struct mbuf **);
void sohasoutofband(struct socket *);
void soisconnected(struct socket *);
void soisconnecting(struct socket *);
void soisdisconnected(struct socket *);
void soisdisconnecting(struct socket *);
int solisten(struct socket *, int);
struct socket *
sonewconn1(struct socket *, int);
void soqinsque(struct socket *, struct socket *, int);
int soqremque(struct socket *, int);
int soreceive(struct socket *, struct mbuf **, struct uio *,
struct mbuf **, struct mbuf **, int *);
int soreserve(struct socket *, u_long, u_long);
void sorflush(struct socket *);
int sosend(struct socket *, struct mbuf *, struct uio *,
struct mbuf *, struct mbuf *, int, struct proc *);
int sosetopt(struct socket *, int, int, struct mbuf *);
int soshutdown(struct socket *, int);
void sowakeup(struct socket *, struct sockbuf *, int);
int sockargs(struct mbuf **, const void *, size_t, int);
int sendit(struct proc *, int, struct msghdr *, int, register_t *);
int recvit(struct proc *, int, struct msghdr *, caddr_t, register_t *);
#ifdef SOCKBUF_DEBUG
/*
* SBLASTRECORDCHK: check sb->sb_lastrecord is maintained correctly.
* SBLASTMBUFCHK: check sb->sb_mbtail is maintained correctly.
*
* => panic if the socket buffer is inconsistent.
* => 'where' is used for a panic message.
*/
void sblastrecordchk(struct sockbuf *, const char *);
#define SBLASTRECORDCHK(sb, where) sblastrecordchk((sb), (where))
void sblastmbufchk(struct sockbuf *, const char *);
#define SBLASTMBUFCHK(sb, where) sblastmbufchk((sb), (where))
#else
#define SBLASTRECORDCHK(sb, where) /* nothing */
#define SBLASTMBUFCHK(sb, where) /* nothing */
#endif /* SOCKBUF_DEBUG */
/* sosend loan */
vaddr_t sokvaalloc(vsize_t, struct socket *);
void sokvafree(vaddr_t, vsize_t);
void soloanfree(struct mbuf *, caddr_t, size_t, void *);
/*
* Values for socket-buffer-append priority argument to sbappendaddrchain().
* The following flags are reserved for future implementation:
*
* SB_PRIO_NONE: honour normal socket-buffer limits.
*
* SB_PRIO_ONESHOT_OVERFLOW: if the socket has any space,
* deliver the entire chain. Intended for large requests
* that should be delivered in their entirety, or not at all.
*
* SB_PRIO_OVERDRAFT: allow a small (2*MLEN) overflow, over and
* aboce normal socket limits. Intended messages indicating
* buffer overflow in earlier normal/lower-priority messages .
*
* SB_PRIO_BESTEFFORT: Ignore limits entirely. Intended only for
* kernel-generated messages to specially-marked scokets which
* require "reliable" delivery, nd where the source socket/protocol
* message generator enforce some hard limit (but possibly well
* above kern.sbmax). It is entirely up to the in-kernel source to
* avoid complete mbuf exhaustion or DoS scenarios.
*/
#define SB_PRIO_NONE 0
#define SB_PRIO_ONESHOT_OVERFLOW 1
#define SB_PRIO_OVERDRAFT 2
#define SB_PRIO_BESTEFFORT 3
#endif /* _KERNEL */
#endif /* !_SYS_SOCKETVAR_H_ */
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