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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)socketvar.h 8.3 (Berkeley) 2/19/95
  30  * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.10 2003/08/24 08:24:39 hsu Exp $
  31  * $DragonFly: src/sys/sys/socketvar.h,v 1.35 2008/08/28 23:15:45 dillon Exp $
  32  */
  33
  34 #ifndef _SYS_SOCKETVAR_H_
  35 #define _SYS_SOCKETVAR_H_
  36
  37 #ifndef _SYS_TYPES_H_
  38 #include <sys/types.h>
  39 #endif
  40 #ifndef _SYS_QUEUE_H_
  41 #include <sys/queue.h>                  /* for TAILQ macros */
  42 #endif
  43 #ifndef _SYS_EVENT_H_
  44 #include <sys/event.h>                  /* for struct kqinfo */
  45 #endif
  46 #ifndef _SYS_THREAD_H_
  47 #include <sys/thread.h>                 /* for struct lwkt_token */
  48 #endif
  49 #ifndef _SYS_SOCKBUF_H_
  50 #include <sys/sockbuf.h>
  51 #endif
  52
  53 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  54
  55 #ifndef _NET_NETMSG_H_
  56 #include <net/netmsg.h>
  57 #endif
  58
  59 #ifndef _SYS_SPINLOCK_H_
  60 #include <sys/spinlock.h>
  61 #endif
  62
  63 struct accept_filter;
  64
  65 /*
  66  * Signaling socket buffers contain additional elements for locking
  67  * and signaling conditions.  These are used primarily by sockets.
  68  *
  69  * WARNING: See partial clearing of fields in kern/uipc_socket.c
  70  *          sorflush() and sowflush().
  71  */
  72 struct signalsockbuf {
  73         struct sockbuf sb;
  74         struct kqinfo ssb_kq;   /* process selecting read/write */
  75         struct notifymsglist ssb_mlist; /* list of pending predicate messages */
  76         uint32_t ssb_flags;     /* flags, see below (use atomic ops) */
  77         u_int   ssb_timeo;      /* timeout for read/write */
  78         long    ssb_lowat;      /* low water mark */
  79         u_long  ssb_hiwat;      /* high water mark / max actual char count */
  80         u_long  ssb_mbmax;      /* max chars of mbufs to use */
  81         struct lwkt_token ssb_token; /* frontend/backend serializer */
  82 };
  83
  84 #define ssb_cc          sb.sb_cc        /* commonly used fields */
  85 #define ssb_mb          sb.sb_mb        /* commonly used fields */
  86 #define ssb_mbcnt       sb.sb_mbcnt     /* commonly used fields */
  87 #define ssb_cc_prealloc sb.sb_cc_prealloc
  88 #define ssb_mbcnt_prealloc sb.sb_mbcnt_prealloc
  89
  90 #define SSB_LOCK        0x0001          /* lock on data queue */
  91 #define SSB_WANT        0x0002          /* someone is waiting to lock */
  92 #define SSB_WAIT        0x0004          /* someone is waiting for data/space */
  93 #define SSB_ASYNC       0x0010          /* ASYNC I/O, need signals */
  94 #define SSB_UPCALL      0x0020          /* someone wants an upcall */
  95 #define SSB_NOINTR      0x0040          /* operations not interruptible */
  96 /*#define SSB_AIO       0x0080*/        /* AIO operations queued */
  97 #define SSB_KNOTE       0x0100          /* kernel note attached */
  98 #define SSB_MEVENT      0x0200          /* need message event notification */
  99 #define SSB_STOP        0x0400          /* backpressure indicator */
 100 #define SSB_AUTOSIZE    0x0800          /* automatically size socket buffer */
 101 #define SSB_AUTOLOWAT   0x1000          /* automatically scale lowat */
 102 #define SSB_WAKEUP      0x2000          /* wakeup event race */
 103 #define SSB_PREALLOC    0x4000          /* prealloc supported */
 104 #define SSB_STOPSUPP    0x8000          /* SSB_STOP supported */
 105
 106 #define SSB_CLEAR_MASK  (SSB_ASYNC | SSB_UPCALL | SSB_STOP | \
 107                          SSB_AUTOSIZE | SSB_AUTOLOWAT)
 108
 109 #define SSB_NOTIFY_MASK (SSB_WAIT | SSB_ASYNC | SSB_UPCALL | \
 110                          SSB_KNOTE | SSB_MEVENT)
 111
 112 /*
 113  * Per-socket kernel structure.  Contains universal send and receive queues,
 114  * protocol control handle, and error information.
 115  */
 116 struct socket {
 117         short   so_type;                /* generic type, see socket.h */
 118         short   so_options;             /* from socket call, see socket.h */
 119         short   so_linger;              /* time to linger while closing */
 120         short   so_state;               /* internal state flags SS_*, below */
 121         void    *so_pcb;                /* protocol control block */
 122         struct  protosw *so_proto;      /* protocol handle */
 123         struct  socket *so_head;        /* back pointer to accept socket */
 124         lwkt_port_t so_port;            /* message port */
 125
 126         /*
 127          * These fields are used to manage sockets capable of accepting
 128          * new connections.
 129          */
 130         TAILQ_HEAD(, socket) so_incomp; /* in-progress, incomplete */
 131         TAILQ_HEAD(, socket) so_comp;   /* completed but not yet accepted */
 132         TAILQ_ENTRY(socket) so_list;    /* list of unaccepted connections */
 133         short   so_qlen;                /* so_comp count */
 134         short   so_incqlen;             /* so_incomp count */
 135         short   so_qlimit;              /* max number queued connections */
 136
 137         /*
 138          * Misc socket support
 139          */
 140         short   so_timeo;               /* connection timeout */
 141         u_short so_error;               /* error affecting connection */
 142         struct  sigio *so_sigio;        /* information for async I/O or
 143                                            out of band data (SIGURG) */
 144         u_long  so_oobmark;             /* chars to oob mark */
 145         TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
 146         struct signalsockbuf so_rcv;
 147         struct signalsockbuf so_snd;
 148
 149         void    (*so_upcall) (struct socket *, void *, int);
 150         void    *so_upcallarg;
 151         struct  ucred *so_cred;         /* user credentials */
 152         /* NB: generation count must not be first; easiest to make it last. */
 153         void    *so_emuldata;           /* private data for emulators */
 154         int     so_refs;                /* shutdown refs */
 155         struct  so_accf {
 156                 struct  accept_filter *so_accept_filter;
 157                 void    *so_accept_filter_arg;  /* saved filter args */
 158                 char    *so_accept_filter_str;  /* saved user args */
 159         } *so_accf;
 160
 161         struct netmsg_base so_clomsg;
 162         struct sockaddr *so_faddr;
 163
 164         struct spinlock so_rcvd_spin;
 165         struct netmsg_pru_rcvd so_rcvd_msg;
 166
 167         lwkt_port_t so_orig_port;
 168 };
 169
 170 #endif
 171
 172 /*
 173  * Socket state bits.
 174  *
 175  * NOTE: The following states are interlocked with so_refs:
 176  *
 177  *      SS_NOFDREF      so_refs while not set
 178  *      (so_pcb)        so_refs while set
 179  */
 180 #define SS_NOFDREF              0x0001  /* no file table ref any more */
 181 #define SS_ISCONNECTED          0x0002  /* socket connected to a peer */
 182 #define SS_ISCONNECTING         0x0004  /* in process of connecting to peer */
 183 #define SS_ISDISCONNECTING      0x0008  /* in process of disconnecting */
 184 #define SS_CANTSENDMORE         0x0010  /* can't send more data to peer */
 185 #define SS_CANTRCVMORE          0x0020  /* can't receive more data from peer */
 186 #define SS_RCVATMARK            0x0040  /* at mark on input */
 187
 188 #define SS_ISCLOSING            0x0080  /* in process of closing */
 189 #define SS_ASSERTINPROG         0x0100  /* sonewconn race debugging */
 190 #define SS_ASYNC                0x0200  /* async i/o notify */
 191 #define SS_ISCONFIRMING         0x0400  /* deciding to accept connection req */
 192
 193 #define SS_INCOMP               0x0800  /* unaccepted, incomplete connection */
 194 #define SS_COMP                 0x1000  /* unaccepted, complete connection */
 195 #define SS_ISDISCONNECTED       0x2000  /* socket disconnected from peer */
 196
 197 /*
 198  * Externalized form of struct socket used by the sysctl(3) interface.
 199  */
 200 struct  xsocket {
 201         size_t  xso_len;        /* length of this structure */
 202         struct  socket *xso_so; /* makes a convenient handle sometimes */
 203         short   so_type;
 204         short   so_options;
 205         short   so_linger;
 206         short   so_state;
 207         void    *so_pcb;                /* another convenient handle */
 208         int     xso_protocol;
 209         int     xso_family;
 210         short   so_qlen;
 211         short   so_incqlen;
 212         short   so_qlimit;
 213         short   so_timeo;
 214         u_short so_error;
 215         pid_t   so_pgid;
 216         u_long  so_oobmark;
 217         struct  xsockbuf {
 218                 u_long  sb_cc;
 219                 u_long  sb_hiwat;
 220                 u_long  sb_mbcnt;
 221                 u_long  sb_mbmax;
 222                 long    sb_lowat;
 223                 u_int   sb_timeo;
 224                 short   sb_flags;
 225         } so_rcv, so_snd;
 226         uid_t   so_uid;         /* XXX */
 227 };
 228
 229 /*
 230  * Macros for sockets and socket buffering.
 231  */
 232
 233 #define sosendallatonce(so) \
 234     ((so)->so_proto->pr_flags & PR_ATOMIC)
 235
 236 /* can we read something from so? */
 237 #define soreadable(so) \
 238     ((so)->so_rcv.ssb_cc >= (so)->so_rcv.ssb_lowat || \
 239         ((so)->so_state & SS_CANTRCVMORE) || \
 240         !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error)
 241
 242 /* can we write something to so? */
 243 #define sowriteable(so) \
 244     ((ssb_space(&(so)->so_snd) >= (so)->so_snd.ssb_lowat && \
 245         (((so)->so_state&SS_ISCONNECTED) || \
 246           ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
 247      ((so)->so_state & SS_CANTSENDMORE) || \
 248      (so)->so_error)
 249
 250 /* do we have to send all at once on a socket? */
 251
 252 #ifdef _KERNEL
 253
 254 /*
 255  * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
 256  * This is problematical if the fields are unsigned, as the space might
 257  * still be negative (cc > hiwat or mbcnt > mbmax).  Should detect
 258  * overflow and return 0.
 259  *
 260  * SSB_STOP ignores cc/hiwat and returns 0.  This is used by unix domain
 261  * stream sockets to signal backpressure.
 262  */
 263 static __inline
 264 long
 265 ssb_space(struct signalsockbuf *ssb)
 266 {
 267         long bleft;
 268         long mleft;
 269
 270         if (ssb->ssb_flags & SSB_STOP)
 271                 return(0);
 272         bleft = ssb->ssb_hiwat - ssb->ssb_cc;
 273         mleft = ssb->ssb_mbmax - ssb->ssb_mbcnt;
 274         return((bleft < mleft) ? bleft : mleft);
 275 }
 276
 277 static __inline long
 278 ssb_space_prealloc(struct signalsockbuf *ssb)
 279 {
 280         long bleft, bleft_prealloc;
 281         long mleft, mleft_prealloc;
 282
 283         if (ssb->ssb_flags & SSB_STOP)
 284                 return(0);
 285
 286         bleft = ssb->ssb_hiwat - ssb->ssb_cc;
 287         bleft_prealloc = ssb->ssb_hiwat - ssb->ssb_cc_prealloc;
 288         if (bleft_prealloc < bleft)
 289                 bleft = bleft_prealloc;
 290
 291         mleft = ssb->ssb_mbmax - ssb->ssb_mbcnt;
 292         mleft_prealloc = ssb->ssb_mbmax - ssb->ssb_mbcnt_prealloc;
 293         if (mleft_prealloc < mleft)
 294                 mleft = mleft_prealloc;
 295
 296         return((bleft < mleft) ? bleft : mleft);
 297 }
 298
 299 /*
 300  * NOTE: Only works w/ later ssb_appendstream() on m
 301  */
 302 static __inline void
 303 ssb_preallocstream(struct signalsockbuf *ssb, struct mbuf *m)
 304 {
 305         if (m->m_len == 0)
 306                 return;
 307         sbprealloc(&ssb->sb, m);
 308 }
 309
 310 #endif
 311
 312 #define ssb_append(ssb, m)                                              \
 313         sbappend(&(ssb)->sb, m)
 314
 315 #define ssb_appendstream(ssb, m)                                        \
 316         sbappendstream(&(ssb)->sb, m)
 317
 318 #define ssb_appendrecord(ssb, m)                                        \
 319         sbappendrecord(&(ssb)->sb, m)
 320
 321 #define ssb_appendaddr(ssb, src, m, control)                            \
 322         ((ssb_space(ssb) <= 0) ? 0 : sbappendaddr(&(ssb)->sb, src, m, control))
 323
 324 #define ssb_appendcontrol(ssb, m, control)                              \
 325         ((ssb_space(ssb) <= 0) ? 0 : sbappendcontrol(&(ssb)->sb, m, control))
 326
 327 #define ssb_insert_knote(ssb, kn) do {                                  \
 328         knote_insert(&(ssb)->ssb_kq.ki_note, kn);                       \
 329         atomic_set_int(&(ssb)->ssb_flags, SSB_KNOTE);                   \
 330 } while(0)
 331
 332 #define ssb_remove_knote(ssb, kn) do {                                  \
 333         knote_remove(&(ssb)->ssb_kq.ki_note, kn);                       \
 334         if (SLIST_EMPTY(&(ssb)->ssb_kq.ki_note))                        \
 335                 atomic_clear_int(&(ssb)->ssb_flags, SSB_KNOTE);         \
 336 } while(0)
 337
 338 #define sorwakeup(so)   sowakeup((so), &(so)->so_rcv)
 339 #define sowwakeup(so)   sowakeup((so), &(so)->so_snd)
 340
 341 #ifdef _KERNEL
 342
 343 /*
 344  * Argument structure for sosetopt et seq.  This is in the KERNEL
 345  * section because it will never be visible to user code.
 346  */
 347 enum sopt_dir { SOPT_GET, SOPT_SET };
 348 struct sockopt {
 349         enum    sopt_dir sopt_dir; /* is this a get or a set? */
 350         int     sopt_level;     /* second arg of [gs]etsockopt */
 351         int     sopt_name;      /* third arg of [gs]etsockopt */
 352         void   *sopt_val;       /* fourth arg of [gs]etsockopt */
 353         size_t  sopt_valsize;   /* (almost) fifth arg of [gs]etsockopt */
 354         struct  thread *sopt_td; /* calling thread or null if kernel */
 355 };
 356
 357 struct accept_filter {
 358         char    accf_name[16];
 359         void    (*accf_callback)
 360                 (struct socket *so, void *arg, int waitflag);
 361         void *  (*accf_create)
 362                 (struct socket *so, char *arg);
 363         void    (*accf_destroy)
 364                 (struct socket *so);
 365         SLIST_ENTRY(accept_filter) accf_next;   /* next on the list */
 366 };
 367
 368 #ifdef MALLOC_DECLARE
 369 MALLOC_DECLARE(M_PCB);
 370 MALLOC_DECLARE(M_SONAME);
 371 MALLOC_DECLARE(M_ACCF);
 372 #endif
 373
 374 extern int      maxsockets;
 375 extern u_long   sb_max;         /* nominal limit */
 376 extern u_long   sb_max_adj;     /* actual limit used by sbreserve() */
 377
 378 struct file;
 379 struct filedesc;
 380 struct mbuf;
 381 struct rlimit;
 382 struct sockaddr;
 383 struct stat;
 384 struct ucred;
 385 struct uio;
 386 struct knote;
 387 struct sysmsg;
 388
 389 /*
 390  * File operations on sockets.
 391  */
 392 int     soo_read (struct file *fp, struct uio *uio, struct ucred *cred,
 393                         int flags);
 394 int     soo_write (struct file *fp, struct uio *uio, struct ucred *cred,
 395                         int flags);
 396 int     soo_close (struct file *fp);
 397 int     soo_shutdown (struct file *fp, int how);
 398 int     soo_ioctl (struct file *fp, u_long cmd, caddr_t data,
 399                         struct ucred *cred, struct sysmsg *msg);
 400 int     soo_stat (struct file *fp, struct stat *ub, struct ucred *cred);
 401 int     sokqfilter (struct file *fp, struct knote *kn);
 402
 403 /*
 404  * From uipc_socket and friends
 405  */
 406 struct  sockaddr *dup_sockaddr (const struct sockaddr *sa);
 407 int     getsockaddr (struct sockaddr **namp, caddr_t uaddr, size_t len);
 408
 409 void    ssb_release (struct signalsockbuf *ssb, struct socket *so);
 410 int     ssb_reserve (struct signalsockbuf *ssb, u_long cc, struct socket *so,
 411                    struct rlimit *rl);
 412 void    ssbtoxsockbuf (struct signalsockbuf *sb, struct xsockbuf *xsb);
 413 int     ssb_wait (struct signalsockbuf *sb);
 414 int     _ssb_lock (struct signalsockbuf *sb);
 415
 416 void    soabort_async (struct socket *so, boolean_t clr_head);
 417 void    soabort_direct (struct socket *so);
 418 int     soaccept (struct socket *so, struct sockaddr **nam);
 419 void    soaccept_generic (struct socket *so);
 420 struct  socket *soalloc (int waitok, struct protosw *);
 421 int     sobind (struct socket *so, struct sockaddr *nam, struct thread *td);
 422 void    socantrcvmore (struct socket *so);
 423 void    socantsendmore (struct socket *so);
 424 int     socket_wait (struct socket *so, struct timespec *ts, int *res);
 425 int     soclose (struct socket *so, int fflags);
 426 int     soconnect (struct socket *so, struct sockaddr *nam, struct thread *td,
 427             boolean_t sync);
 428 int     soconnect2 (struct socket *so1, struct socket *so2);
 429 int     socreate (int dom, struct socket **aso, int type, int proto,
 430             struct thread *td);
 431 int     sodisconnect (struct socket *so);
 432 void    sodiscard (struct socket *so);
 433 void    sofree (struct socket *so);
 434 int     sogetopt (struct socket *so, struct sockopt *sopt);
 435 void    sohasoutofband (struct socket *so);
 436 void    soisconnected (struct socket *so);
 437 void    soisconnecting (struct socket *so);
 438 void    soisdisconnected (struct socket *so);
 439 void    soisdisconnecting (struct socket *so);
 440 void    soisreconnected (struct socket *so);
 441 void    soisreconnecting (struct socket *so);
 442 void    sosetport (struct socket *so, struct lwkt_port *port);
 443 int     solisten (struct socket *so, int backlog, struct thread *td);
 444 struct socket *sonewconn (struct socket *head, int connstatus);
 445 struct socket *sonewconn_faddr (struct socket *head, int connstatus,
 446             const struct sockaddr *faddr, boolean_t keep_ref);
 447 void    soinherit(struct socket *so, struct socket *so_inh);
 448 int     sooptcopyin (struct sockopt *sopt, void *buf, size_t len,
 449                          size_t minlen);
 450 int     soopt_to_kbuf (struct sockopt *sopt, void *buf, size_t len,
 451                          size_t minlen);
 452 int     sooptcopyout (struct sockopt *sopt, const void *buf, size_t len);
 453 void    soopt_from_kbuf (struct sockopt *sopt, const void *buf, size_t len);
 454
 455 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
 456 int     soopt_getm (struct sockopt *sopt, struct mbuf **mp);
 457 int     soopt_mcopyin (struct sockopt *sopt, struct mbuf *m);
 458 void    soopt_to_mbuf (struct sockopt *sopt, struct mbuf *m);
 459 int     soopt_mcopyout (struct sockopt *sopt, struct mbuf *m);
 460 int     soopt_from_mbuf (struct sockopt *sopt, struct mbuf *m);
 461
 462 int     soreceive (struct socket *so, struct sockaddr **paddr,
 463                        struct uio *uio, struct sockbuf *sio,
 464                        struct mbuf **controlp, int *flagsp);
 465 int     sorecvtcp (struct socket *so, struct sockaddr **paddr,
 466                        struct uio *uio, struct sockbuf *sio,
 467                        struct mbuf **controlp, int *flagsp);
 468 int     soreserve (struct socket *so, u_long sndcc, u_long rcvcc,
 469                    struct rlimit *rl);
 470 void    sorflush (struct socket *so);
 471 int     sosend (struct socket *so, struct sockaddr *addr, struct uio *uio,
 472                     struct mbuf *top, struct mbuf *control, int flags,
 473                     struct thread *td);
 474 int     sosendudp (struct socket *so, struct sockaddr *addr, struct uio *uio,
 475                     struct mbuf *top, struct mbuf *control, int flags,
 476                     struct thread *td);
 477 int     sosendtcp (struct socket *so, struct sockaddr *addr, struct uio *uio,
 478                     struct mbuf *top, struct mbuf *control, int flags,
 479                     struct thread *td);
 480 int     sosetopt (struct socket *so, struct sockopt *sopt);
 481 int     soshutdown (struct socket *so, int how);
 482 void    sotoxsocket (struct socket *so, struct xsocket *xso);
 483 void    sowakeup (struct socket *so, struct signalsockbuf *sb);
 484
 485 /* accept filter functions */
 486 int     accept_filt_add (struct accept_filter *filt);
 487 int     accept_filt_del (char *name);
 488 struct accept_filter *  accept_filt_get (char *name);
 489 #ifdef ACCEPT_FILTER_MOD
 490 int accept_filt_generic_mod_event (module_t mod, int event, void *data);
 491 SYSCTL_DECL(_net_inet_accf);
 492 #endif /* ACCEPT_FILTER_MOD */
 493
 494 #endif /* _KERNEL */
 495
 496 #endif /* !_SYS_SOCKETVAR_H_ */