sys/sys/socketvar.h

   1 /*-
   2  * Copyright (c) 1982, 1986, 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)socketvar.h 8.3 (Berkeley) 2/19/95
  34  * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.10 2003/08/24 08:24:39 hsu Exp $
  35  * $DragonFly: src/sys/sys/socketvar.h,v 1.20 2005/07/23 07:28:36 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_SOCKETVAR_H_
  39 #define _SYS_SOCKETVAR_H_
  40
  41 #include <sys/queue.h>                  /* for TAILQ macros */
  42 #include <sys/select.h>                 /* for struct selinfo */
  43
  44 /*
  45  * Kernel structure per socket.
  46  * Contains send and receive buffer queues,
  47  * handle on protocol and pointer to protocol
  48  * private data and error information.
  49  */
  50 typedef u_quad_t so_gen_t;
  51
  52 struct accept_filter;
  53
  54 struct socket {
  55         short   so_type;                /* generic type, see socket.h */
  56         short   so_options;             /* from socket call, see socket.h */
  57         short   so_linger;              /* time to linger while closing */
  58         short   so_state;               /* internal state flags SS_*, below */
  59         void    *so_pcb;                /* protocol control block */
  60         struct  protosw *so_proto;      /* protocol handle */
  61 /*
  62  * Variables for connection queuing.
  63  * Socket where accepts occur is so_head in all subsidiary sockets.
  64  * If so_head is 0, socket is not related to an accept.
  65  * For head socket so_incomp queues partially completed connections,
  66  * while so_comp is a queue of connections ready to be accepted.
  67  * If a connection is aborted and it has so_head set, then
  68  * it has to be pulled out of either so_incomp or so_comp.
  69  * We allow connections to queue up based on current queue lengths
  70  * and limit on number of queued connections for this socket.
  71  */
  72         struct  socket *so_head;        /* back pointer to accept socket */
  73         TAILQ_HEAD(, socket) so_incomp; /* queue of partial unaccepted connections */
  74         TAILQ_HEAD(, socket) so_comp;   /* queue of complete unaccepted connections */
  75         TAILQ_ENTRY(socket) so_list;    /* list of unaccepted connections */
  76         short   so_qlen;                /* number of unaccepted connections */
  77         short   so_incqlen;             /* number of unaccepted incomplete
  78                                            connections */
  79         short   so_qlimit;              /* max number queued connections */
  80         short   so_timeo;               /* connection timeout */
  81         u_short so_error;               /* error affecting connection */
  82         struct  sigio *so_sigio;        /* information for async I/O or
  83                                            out of band data (SIGURG) */
  84         u_long  so_oobmark;             /* chars to oob mark */
  85         TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
  86 /*
  87  * Variables for socket buffering.
  88  */
  89         struct  sockbuf {
  90                 u_long  sb_cc;          /* actual chars in buffer */
  91                 u_long  sb_hiwat;       /* max actual char count */
  92                 u_long  sb_mbcnt;       /* chars of mbufs used */
  93                 u_long  sb_mbmax;       /* max chars of mbufs to use */
  94                 long    sb_lowat;       /* low water mark */
  95                 struct  mbuf *sb_mb;    /* the mbuf chain */
  96                 struct  mbuf *sb_lastmbuf;      /* last mbuf in sb_mb */
  97                 struct  mbuf *sb_lastrecord;    /* last record in sb_mb
  98                                                  * valid <=> sb_mb non-NULL */
  99                 struct  selinfo sb_sel; /* process selecting read/write */
 100                 short   sb_flags;       /* flags, see below */
 101                 short   sb_timeo;       /* timeout for read/write */
 102         } so_rcv, so_snd;
 103 #define SB_MAX          (256*1024)      /* default for max chars in sockbuf */
 104 #define SB_LOCK         0x01            /* lock on data queue */
 105 #define SB_WANT         0x02            /* someone is waiting to lock */
 106 #define SB_WAIT         0x04            /* someone is waiting for data/space */
 107 #define SB_SEL          0x08            /* someone is selecting */
 108 #define SB_ASYNC        0x10            /* ASYNC I/O, need signals */
 109 #define SB_UPCALL       0x20            /* someone wants an upcall */
 110 #define SB_NOINTR       0x40            /* operations not interruptible */
 111 #define SB_AIO          0x80            /* AIO operations queued */
 112 #define SB_KNOTE        0x100           /* kernel note attached */
 113 #define SB_MEVENT       0x200           /* need message event notification */
 114
 115         void    (*so_upcall) (struct socket *, void *, int);
 116         void    *so_upcallarg;
 117         struct  ucred *so_cred;         /* user credentials */
 118         /* NB: generation count must not be first; easiest to make it last. */
 119         so_gen_t so_gencnt;             /* generation count */
 120         void    *so_emuldata;           /* private data for emulators */
 121         struct  so_accf {
 122                 struct  accept_filter *so_accept_filter;
 123                 void    *so_accept_filter_arg;  /* saved filter args */
 124                 char    *so_accept_filter_str;  /* saved user args */
 125         } *so_accf;
 126 };
 127
 128 /*
 129  * Socket state bits.
 130  */
 131 #define SS_NOFDREF              0x0001  /* no file table ref any more */
 132 #define SS_ISCONNECTED          0x0002  /* socket connected to a peer */
 133 #define SS_ISCONNECTING         0x0004  /* in process of connecting to peer */
 134 #define SS_ISDISCONNECTING      0x0008  /* in process of disconnecting */
 135 #define SS_CANTSENDMORE         0x0010  /* can't send more data to peer */
 136 #define SS_CANTRCVMORE          0x0020  /* can't receive more data from peer */
 137 #define SS_RCVATMARK            0x0040  /* at mark on input */
 138
 139 #define SS_NBIO                 0x0100  /* non-blocking ops */
 140 #define SS_ASYNC                0x0200  /* async i/o notify */
 141 #define SS_ISCONFIRMING         0x0400  /* deciding to accept connection req */
 142
 143 #define SS_INCOMP               0x0800  /* unaccepted, incomplete connection */
 144 #define SS_COMP                 0x1000  /* unaccepted, complete connection */
 145 #define SS_ISDISCONNECTED       0x2000  /* socket disconnected from peer */
 146
 147 /*
 148  * Externalized form of struct socket used by the sysctl(3) interface.
 149  */
 150 struct  xsocket {
 151         size_t  xso_len;        /* length of this structure */
 152         struct  socket *xso_so; /* makes a convenient handle sometimes */
 153         short   so_type;
 154         short   so_options;
 155         short   so_linger;
 156         short   so_state;
 157         void    *so_pcb;                /* another convenient handle */
 158         int     xso_protocol;
 159         int     xso_family;
 160         short   so_qlen;
 161         short   so_incqlen;
 162         short   so_qlimit;
 163         short   so_timeo;
 164         u_short so_error;
 165         pid_t   so_pgid;
 166         u_long  so_oobmark;
 167         struct  xsockbuf {
 168                 u_long  sb_cc;
 169                 u_long  sb_hiwat;
 170                 u_long  sb_mbcnt;
 171                 u_long  sb_mbmax;
 172                 long    sb_lowat;
 173                 short   sb_flags;
 174                 short   sb_timeo;
 175         } so_rcv, so_snd;
 176         uid_t   so_uid;         /* XXX */
 177 };
 178
 179 /*
 180  * Macros for sockets and socket buffering.
 181  */
 182
 183 #ifdef SOCKBUF_DEBUG
 184 #define sbcheck(sb)     _sbcheck(sb)
 185 #else
 186 #define sbcheck(sb)
 187 #endif
 188
 189 /*
 190  * Do we need to notify the other side when I/O is possible?
 191  */
 192 #define sb_notify(sb)                                           \
 193 (((sb)->sb_flags &                                              \
 194  (SB_WAIT | SB_SEL | SB_ASYNC | SB_UPCALL | SB_AIO | SB_KNOTE | SB_MEVENT)))
 195
 196 /*
 197  * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
 198  * This is problematical if the fields are unsigned, as the space might
 199  * still be negative (cc > hiwat or mbcnt > mbmax).  Should detect
 200  * overflow and return 0.  Should use "lmin" but it doesn't exist now.
 201  */
 202 #define sbspace(sb) \
 203     ((long) imin((int)((sb)->sb_hiwat - (sb)->sb_cc), \
 204          (int)((sb)->sb_mbmax - (sb)->sb_mbcnt)))
 205
 206 /* do we have to send all at once on a socket? */
 207 #define sosendallatonce(so) \
 208     ((so)->so_proto->pr_flags & PR_ATOMIC)
 209
 210 /* can we read something from so? */
 211 #define soreadable(so) \
 212     ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \
 213         ((so)->so_state & SS_CANTRCVMORE) || \
 214         !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
 215
 216 /* can we write something to so? */
 217 #define sowriteable(so) \
 218     ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
 219         (((so)->so_state&SS_ISCONNECTED) || \
 220           ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
 221      ((so)->so_state & SS_CANTSENDMORE) || \
 222      (so)->so_error)
 223
 224 /* adjust counters in sb reflecting allocation of m */
 225 #define sballoc(sb, m) { \
 226         (sb)->sb_cc += (m)->m_len; \
 227         (sb)->sb_mbcnt += MSIZE; \
 228         if ((m)->m_flags & M_EXT) \
 229                 (sb)->sb_mbcnt += (m)->m_ext.ext_size; \
 230 }
 231
 232 /* adjust counters in sb reflecting freeing of m */
 233 #define sbfree(sb, m) { \
 234         (sb)->sb_cc -= (m)->m_len; \
 235         (sb)->sb_mbcnt -= MSIZE; \
 236         if ((m)->m_flags & M_EXT) \
 237                 (sb)->sb_mbcnt -= (m)->m_ext.ext_size; \
 238 }
 239
 240 /*
 241  * Set lock on sockbuf sb; sleep if lock is already held.
 242  * Unless SB_NOINTR is set on sockbuf, sleep is interruptible.
 243  * Returns error without lock if sleep is interrupted.
 244  */
 245 #define sblock(sb, wf) ((sb)->sb_flags & SB_LOCK ? \
 246                 (((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \
 247                 ((sb)->sb_flags |= SB_LOCK), 0)
 248
 249 /* release lock on sockbuf sb */
 250 #define sbunlock(sb) { \
 251         (sb)->sb_flags &= ~SB_LOCK; \
 252         if ((sb)->sb_flags & SB_WANT) { \
 253                 (sb)->sb_flags &= ~SB_WANT; \
 254                 wakeup((caddr_t)&(sb)->sb_flags); \
 255         } \
 256 }
 257
 258 #define sorwakeup(so)   do { \
 259                           if (sb_notify(&(so)->so_rcv)) \
 260                             sowakeup((so), &(so)->so_rcv); \
 261                         } while (0)
 262
 263 #define sowwakeup(so)   do { \
 264                           if (sb_notify(&(so)->so_snd)) \
 265                             sowakeup((so), &(so)->so_snd); \
 266                         } while (0)
 267
 268 #ifdef _KERNEL
 269
 270 /*
 271  * Argument structure for sosetopt et seq.  This is in the KERNEL
 272  * section because it will never be visible to user code.
 273  */
 274 enum sopt_dir { SOPT_GET, SOPT_SET };
 275 struct sockopt {
 276         enum    sopt_dir sopt_dir; /* is this a get or a set? */
 277         int     sopt_level;     /* second arg of [gs]etsockopt */
 278         int     sopt_name;      /* third arg of [gs]etsockopt */
 279         void   *sopt_val;       /* fourth arg of [gs]etsockopt */
 280         size_t  sopt_valsize;   /* (almost) fifth arg of [gs]etsockopt */
 281         struct  thread *sopt_td; /* calling thread or null if kernel */
 282 };
 283
 284 struct accept_filter {
 285         char    accf_name[16];
 286         void    (*accf_callback)
 287                 (struct socket *so, void *arg, int waitflag);
 288         void *  (*accf_create)
 289                 (struct socket *so, char *arg);
 290         void    (*accf_destroy)
 291                 (struct socket *so);
 292         SLIST_ENTRY(accept_filter) accf_next;   /* next on the list */
 293 };
 294
 295 #ifdef MALLOC_DECLARE
 296 MALLOC_DECLARE(M_PCB);
 297 MALLOC_DECLARE(M_SONAME);
 298 MALLOC_DECLARE(M_ACCF);
 299 #endif
 300
 301 extern int      maxsockets;
 302 extern u_long   sb_max;         /* nominal limit */
 303 extern u_long   sb_max_adj;     /* actual limit used by sbreserve() */
 304 extern struct   vm_zone *socket_zone;
 305 extern so_gen_t so_gencnt;
 306
 307 struct file;
 308 struct filedesc;
 309 struct mbuf;
 310 struct rlimit;
 311 struct sockaddr;
 312 struct stat;
 313 struct ucred;
 314 struct uio;
 315 struct knote;
 316
 317 /*
 318  * File operations on sockets.
 319  */
 320 int     soo_read (struct file *fp, struct uio *uio, struct ucred *cred,
 321             int flags, struct thread *td);
 322 int     soo_write (struct file *fp, struct uio *uio, struct ucred *cred,
 323             int flags, struct thread *td);
 324 int     soo_close (struct file *fp, struct thread *td);
 325 int     soo_shutdown (struct file *fp, int how, struct thread *td);
 326 int     soo_ioctl (struct file *fp, u_long cmd, caddr_t data,
 327             struct thread *td);
 328 int     soo_poll (struct file *fp, int events, struct ucred *cred,
 329             struct thread *td);
 330 int     soo_stat (struct file *fp, struct stat *ub, struct thread *td);
 331 int     sokqfilter (struct file *fp, struct knote *kn);
 332
 333 /*
 334  * From uipc_socket and friends
 335  */
 336 struct  sockaddr *dup_sockaddr (const struct sockaddr *sa);
 337 int     holdsock (struct filedesc *fdp, int fdes, struct file **fpp);
 338 int     getsockaddr (struct sockaddr **namp, caddr_t uaddr, size_t len);
 339 void    sbappend (struct sockbuf *sb, struct mbuf *m);
 340 int     sbappendaddr (struct sockbuf *sb, const struct sockaddr *asa,
 341             struct mbuf *m0, struct mbuf *control);
 342 int     sbappendcontrol (struct sockbuf *sb, struct mbuf *m0,
 343             struct mbuf *control);
 344 void    sbappendrecord (struct sockbuf *sb, struct mbuf *m0);
 345 void    sbappendstream (struct sockbuf *sb, struct mbuf *m);
 346 void    _sbcheck (struct sockbuf *sb);
 347 void    sbcompress (struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
 348 struct mbuf *
 349         sbcreatecontrol (caddr_t p, int size, int type, int level);
 350 void    sbdrop (struct sockbuf *sb, int len);
 351 void    sbdroprecord (struct sockbuf *sb);
 352 struct mbuf *
 353         sbunlinkmbuf (struct sockbuf *, struct mbuf *, struct mbuf **);
 354 void    sbflush (struct sockbuf *sb);
 355 void    sbinsertoob (struct sockbuf *sb, struct mbuf *m0);
 356 void    sbrelease (struct sockbuf *sb, struct socket *so);
 357 int     sbreserve (struct sockbuf *sb, u_long cc, struct socket *so,
 358                    struct rlimit *rl);
 359 void    sbtoxsockbuf (struct sockbuf *sb, struct xsockbuf *xsb);
 360 int     sbwait (struct sockbuf *sb);
 361 int     sb_lock (struct sockbuf *sb);
 362 int     soabort (struct socket *so);
 363 int     soaccept (struct socket *so, struct sockaddr **nam);
 364 struct  socket *soalloc (int waitok);
 365 int     sobind (struct socket *so, struct sockaddr *nam, struct thread *td);
 366 void    socantrcvmore (struct socket *so);
 367 void    socantsendmore (struct socket *so);
 368 int     soclose (struct socket *so);
 369 int     soconnect (struct socket *so, struct sockaddr *nam, struct thread *td);
 370 int     soconnect2 (struct socket *so1, struct socket *so2);
 371 int     socreate (int dom, struct socket **aso, int type, int proto,
 372             struct thread *td);
 373 void    sodealloc (struct socket *so);
 374 int     sodisconnect (struct socket *so);
 375 void    sofree (struct socket *so);
 376 int     sogetopt (struct socket *so, struct sockopt *sopt);
 377 void    sohasoutofband (struct socket *so);
 378 void    soisconnected (struct socket *so);
 379 void    soisconnecting (struct socket *so);
 380 void    soisdisconnected (struct socket *so);
 381 void    soisdisconnecting (struct socket *so);
 382 int     solisten (struct socket *so, int backlog, struct thread *td);
 383 struct socket *sonewconn (struct socket *head, int connstatus);
 384 int     sooptcopyin (struct sockopt *sopt, void *buf, size_t len,
 385                          size_t minlen);
 386 int     sooptcopyout (struct sockopt *sopt, const void *buf, size_t len);
 387
 388 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
 389 int     soopt_getm (struct sockopt *sopt, struct mbuf **mp);
 390 int     soopt_mcopyin (struct sockopt *sopt, struct mbuf *m);
 391 int     soopt_mcopyout (struct sockopt *sopt, struct mbuf *m);
 392
 393 int     sopoll (struct socket *so, int events, struct ucred *cred,
 394                     struct thread *td);
 395 int     soreceive (struct socket *so, struct sockaddr **paddr,
 396                        struct uio *uio, struct mbuf **mp0,
 397                        struct mbuf **controlp, int *flagsp);
 398 int     soreserve (struct socket *so, u_long sndcc, u_long rcvcc,
 399                    struct rlimit *rl);
 400 void    sorflush (struct socket *so);
 401 int     sosend (struct socket *so, struct sockaddr *addr, struct uio *uio,
 402                     struct mbuf *top, struct mbuf *control, int flags,
 403                     struct thread *td);
 404 int     sosendudp (struct socket *so, struct sockaddr *addr, struct uio *uio,
 405                     struct mbuf *top, struct mbuf *control, int flags,
 406                     struct thread *td);
 407 int     sosetopt (struct socket *so, struct sockopt *sopt);
 408 int     soshutdown (struct socket *so, int how);
 409 void    sotoxsocket (struct socket *so, struct xsocket *xso);
 410 void    sowakeup (struct socket *so, struct sockbuf *sb);
 411
 412 /* accept filter functions */
 413 int     accept_filt_add (struct accept_filter *filt);
 414 int     accept_filt_del (char *name);
 415 struct accept_filter *  accept_filt_get (char *name);
 416 #ifdef ACCEPT_FILTER_MOD
 417 int accept_filt_generic_mod_event (module_t mod, int event, void *data);
 418 SYSCTL_DECL(_net_inet_accf);
 419 #endif /* ACCEPT_FILTER_MOD */
 420
 421 #endif /* _KERNEL */
 422
 423 #endif /* !_SYS_SOCKETVAR_H_ */