bsd/sys/socketvar.h

   1 /*
   2  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1998, 1999 Apple Computer, Inc. All Rights Reserved */
  23 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  24 /*-
  25  * Copyright (c) 1982, 1986, 1990, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  *
  56  *      @(#)socketvar.h 8.3 (Berkeley) 2/19/95
  57  * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.6 2001/08/31 13:45:49 jlemon Exp $
  58  */
  59
  60 #ifndef _SYS_SOCKETVAR_H_
  61 #define _SYS_SOCKETVAR_H_
  62
  63 #include <sys/appleapiopts.h>
  64 #include <sys/queue.h>                  /* for TAILQ macros */
  65 #include <sys/select.h>                 /* for struct selinfo */
  66 #include <net/kext_net.h>
  67 #include <sys/ev.h>
  68 #include <sys/cdefs.h>
  69
  70 /*
  71  * Hacks to get around compiler complaints
  72  */
  73 struct mbuf;
  74 struct socket_filter_entry;
  75 struct protosw;
  76 struct sockif;
  77 struct sockutil;
  78
  79 #ifdef KERNEL_PRIVATE
  80 /* strings for sleep message: */
  81 extern  char netio[], netcon[], netcls[];
  82 #define SOCKET_CACHE_ON
  83 #define SO_CACHE_FLUSH_INTERVAL 1       /* Seconds */
  84 #define SO_CACHE_TIME_LIMIT     (120/SO_CACHE_FLUSH_INTERVAL) /* Seconds */
  85 #define SO_CACHE_MAX_FREE_BATCH 50
  86 #define MAX_CACHED_SOCKETS      60000
  87 #define TEMPDEBUG               0
  88
  89 /*
  90  * Kernel structure per socket.
  91  * Contains send and receive buffer queues,
  92  * handle on protocol and pointer to protocol
  93  * private data and error information.
  94  */
  95 #endif /* KERNEL_PRIVATE */
  96
  97 typedef u_quad_t so_gen_t;
  98
  99 #ifdef KERNEL_PRIVATE
 100 #ifndef __APPLE__
 101 /* We don't support BSD style socket filters */
 102 struct accept_filter;
 103 #endif
 104
 105 struct socket {
 106         int             so_zone;                        /* zone we were allocated from */
 107         short   so_type;                        /* generic type, see socket.h */
 108         short   so_options;             /* from socket call, see socket.h */
 109         short   so_linger;              /* time to linger while closing */
 110         short   so_state;                       /* internal state flags SS_*, below */
 111         caddr_t so_pcb;                 /* protocol control block */
 112         struct  protosw *so_proto;      /* protocol handle */
 113 /*
 114  * Variables for connection queuing.
 115  * Socket where accepts occur is so_head in all subsidiary sockets.
 116  * If so_head is 0, socket is not related to an accept.
 117  * For head socket so_incomp queues partially completed connections,
 118  * while so_comp is a queue of connections ready to be accepted.
 119  * If a connection is aborted and it has so_head set, then
 120  * it has to be pulled out of either so_incomp or so_comp.
 121  * We allow connections to queue up based on current queue lengths
 122  * and limit on number of queued connections for this socket.
 123  */
 124         struct  socket *so_head;        /* back pointer to accept socket */
 125         TAILQ_HEAD(, socket) so_incomp; /* queue of partial unaccepted connections */
 126         TAILQ_HEAD(, socket) so_comp;   /* queue of complete unaccepted connections */
 127         TAILQ_ENTRY(socket) so_list;    /* list of unaccepted connections */
 128         short   so_qlen;                /* number of unaccepted connections */
 129         short   so_incqlen;             /* number of unaccepted incomplete
 130                                            connections */
 131         short   so_qlimit;              /* max number queued connections */
 132         short   so_timeo;               /* connection timeout */
 133         u_short so_error;               /* error affecting connection */
 134         pid_t   so_pgid;                /* pgid for signals */
 135         u_long  so_oobmark;             /* chars to oob mark */
 136 #ifndef __APPLE__
 137         /* We don't support AIO ops */
 138         TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */
 139 #endif
 140 /*
 141  * Variables for socket buffering.
 142  */
 143         struct  sockbuf {
 144                 u_long  sb_cc;          /* actual chars in buffer */
 145                 u_long  sb_hiwat;       /* max actual char count */
 146                 u_long  sb_mbcnt;       /* chars of mbufs used */
 147                 u_long  sb_mbmax;       /* max chars of mbufs to use */
 148                 long    sb_lowat;       /* low water mark */
 149                 struct  mbuf *sb_mb;    /* the mbuf chain */
 150 #if __APPLE__
 151         struct  socket *sb_so;  /* socket back ptr for kexts */
 152 #endif
 153                 struct  selinfo sb_sel; /* process selecting read/write */
 154                 short   sb_flags;       /* flags, see below */
 155                 struct timeval  sb_timeo;       /* timeout for read/write */
 156                 void    *reserved1;     /* for future use if needed */
 157                 void    *reserved2;
 158         } so_rcv, so_snd;
 159 #define SB_MAX          (256*1024)      /* default for max chars in sockbuf */
 160 #define SB_LOCK         0x01            /* lock on data queue */
 161 #define SB_WANT         0x02            /* someone is waiting to lock */
 162 #define SB_WAIT         0x04            /* someone is waiting for data/space */
 163 #define SB_SEL          0x08            /* someone is selecting */
 164 #define SB_ASYNC                0x10            /* ASYNC I/O, need signals */
 165 #define SB_UPCALL               0x20            /* someone wants an upcall */
 166 #define SB_NOINTR               0x40            /* operations not interruptible */
 167 #define SB_KNOTE                0x100   /* kernel note attached */
 168 #ifndef __APPLE__
 169 #define SB_AIO          0x80            /* AIO operations queued */
 170 #else
 171 #define SB_NOTIFY       (SB_WAIT|SB_SEL|SB_ASYNC)
 172 #define SB_RECV         0x8000          /* this is rcv sb */
 173
 174         caddr_t so_tpcb;                /* Wisc. protocol control block - XXX unused? */
 175 #endif
 176
 177         void    (*so_upcall)(struct socket *so, caddr_t arg, int waitf);
 178         caddr_t so_upcallarg;           /* Arg for above */
 179         uid_t   so_uid;                 /* who opened the socket */
 180         /* NB: generation count must not be first; easiest to make it last. */
 181         so_gen_t so_gencnt;             /* generation count */
 182 #ifndef __APPLE__
 183         void    *so_emuldata;           /* private data for emulators */
 184         struct  so_accf {
 185                 struct  accept_filter *so_accept_filter;
 186                 void    *so_accept_filter_arg;  /* saved filter args */
 187                 char    *so_accept_filter_str;  /* saved user args */
 188         } *so_accf;
 189 #else
 190         TAILQ_HEAD(,eventqelt) so_evlist;
 191         int     cached_in_sock_layer;   /* Is socket bundled with pcb/pcb.inp_ppcb? */
 192         struct  socket  *cache_next;
 193         struct  socket  *cache_prev;
 194         u_long          cache_timestamp;
 195         caddr_t         so_saved_pcb;   /* Saved pcb when cacheing */
 196         struct  mbuf *so_temp;          /* Holding area for outbound frags */
 197         /* Plug-in support - make the socket interface overridable */
 198         struct  mbuf *so_tail;
 199         struct socket_filter_entry *so_filt;            /* NKE hook */
 200         u_long  so_flags;               /* Flags */
 201 #define SOF_NOSIGPIPE           0x00000001
 202 #define SOF_NOADDRAVAIL         0x00000002      /* returns EADDRNOTAVAIL if src address is gone */
 203 #define SOF_PCBCLEARING         0x00000004      /* pru_disconnect done, no need to call pru_detach */
 204         int     so_usecount;            /* refcounting of socket use */;
 205         int     so_retaincnt;
 206         u_int32_t       so_filteruse; /* usecount for the socket filters */
 207         void    *reserved3;             /* Temporarily in use/debug: last socket lock LR */
 208         void    *reserved4;             /* Temporarily in use/debug: last socket unlock LR */
 209         thread_t        so_send_filt_thread;
 210 #endif
 211 };
 212 #endif /* KERNEL_PRIVATE */
 213
 214 /*
 215  * Socket state bits.
 216  */
 217 #define SS_NOFDREF              0x001   /* no file table ref any more */
 218 #define SS_ISCONNECTED          0x002   /* socket connected to a peer */
 219 #define SS_ISCONNECTING         0x004   /* in process of connecting to peer */
 220 #define SS_ISDISCONNECTING      0x008   /* in process of disconnecting */
 221 #define SS_CANTSENDMORE         0x010   /* can't send more data to peer */
 222 #define SS_CANTRCVMORE          0x020   /* can't receive more data from peer */
 223 #define SS_RCVATMARK            0x040   /* at mark on input */
 224
 225 #define SS_PRIV                 0x080   /* privileged for broadcast, raw... */
 226 #define SS_NBIO                 0x100   /* non-blocking ops */
 227 #define SS_ASYNC                0x200   /* async i/o notify */
 228 #define SS_ISCONFIRMING         0x400   /* deciding to accept connection req */
 229 #define SS_INCOMP               0x800   /* Unaccepted, incomplete connection */
 230 #define SS_COMP                 0x1000  /* unaccepted, complete connection */
 231 #define SS_ISDISCONNECTED       0x2000  /* socket disconnected from peer */
 232 #define SS_DRAINING             0x4000  /* close waiting for blocked system calls to drain */
 233
 234 /*
 235  * Externalized form of struct socket used by the sysctl(3) interface.
 236  */
 237 struct  xsocket {
 238         size_t  xso_len;        /* length of this structure */
 239         struct  socket *xso_so; /* makes a convenient handle sometimes */
 240         short   so_type;
 241         short   so_options;
 242         short   so_linger;
 243         short   so_state;
 244         caddr_t so_pcb;         /* another convenient handle */
 245         int     xso_protocol;
 246         int     xso_family;
 247         short   so_qlen;
 248         short   so_incqlen;
 249         short   so_qlimit;
 250         short   so_timeo;
 251         u_short so_error;
 252         pid_t   so_pgid;
 253         u_long  so_oobmark;
 254         struct  xsockbuf {
 255                 u_long  sb_cc;
 256                 u_long  sb_hiwat;
 257                 u_long  sb_mbcnt;
 258                 u_long  sb_mbmax;
 259                 long    sb_lowat;
 260                 short   sb_flags;
 261                 short   sb_timeo;
 262         } so_rcv, so_snd;
 263         uid_t   so_uid;         /* XXX */
 264 };
 265
 266 #ifdef KERNEL_PRIVATE
 267 /*
 268  * Macros for sockets and socket buffering.
 269  */
 270
 271 #define sbtoso(sb) (sb->sb_so)
 272
 273 /*
 274  * Functions for sockets and socket buffering.
 275  * These are macros on FreeBSD. On Darwin the
 276  * implementation is in bsd/kern/uipc_socket2.c
 277  */
 278
 279 __BEGIN_DECLS
 280 int             sb_notify(struct sockbuf *sb);
 281 long            sbspace(struct sockbuf *sb);
 282 int             sosendallatonce(struct socket *so);
 283 int             soreadable(struct socket *so);
 284 int             sowriteable(struct socket *so);
 285 void            sballoc(struct sockbuf *sb, struct mbuf *m);
 286 void            sbfree(struct sockbuf *sb, struct mbuf *m);
 287 int             sblock(struct sockbuf *sb, int wf);
 288 void            sbunlock(struct sockbuf *sb, int locked);
 289 void            sorwakeup(struct socket * so);
 290 void            sowwakeup(struct socket * so);
 291 __END_DECLS
 292
 293 /*
 294  * Socket extension mechanism: control block hooks:
 295  * This is the "head" of any control block for an extenstion
 296  * Note: we separate intercept function dispatch vectors from
 297  *  the NFDescriptor to permit selective replacement during
 298  *  operation, e.g., to disable some functions.
 299  */
 300 struct kextcb
 301 {       struct kextcb *e_next;          /* Next kext control block */
 302         void *e_fcb;                    /* Real filter control block */
 303         struct NFDescriptor *e_nfd;     /* NKE Descriptor */
 304         /* Plug-in support - intercept functions */
 305         struct sockif *e_soif;          /* Socket functions */
 306         struct sockutil *e_sout;        /* Sockbuf utility functions */
 307 };
 308 #define EXT_NULL        0x0             /* STATE: Not in use */
 309 #define sotokextcb(so) (so ? so->so_ext : 0)
 310
 311 #ifdef KERNEL
 312
 313 #define SO_FILT_HINT_LOCKED 0x1
 314
 315 /*
 316  * Argument structure for sosetopt et seq.  This is in the KERNEL
 317  * section because it will never be visible to user code.
 318  */
 319 enum sopt_dir { SOPT_GET, SOPT_SET };
 320 struct sockopt {
 321         enum    sopt_dir sopt_dir; /* is this a get or a set? */
 322         int     sopt_level;     /* second arg of [gs]etsockopt */
 323         int     sopt_name;      /* third arg of [gs]etsockopt */
 324         user_addr_t sopt_val;   /* fourth arg of [gs]etsockopt */
 325         size_t  sopt_valsize;   /* (almost) fifth arg of [gs]etsockopt */
 326         struct  proc *sopt_p;   /* calling process or null if kernel */
 327 };
 328
 329 #if SENDFILE
 330 struct sf_buf {
 331         SLIST_ENTRY(sf_buf) free_list;  /* list of free buffer slots */
 332         int             refcnt;         /* reference count */
 333         struct          vm_page *m;     /* currently mapped page */
 334         vm_offset_t     kva;            /* va of mapping */
 335 };
 336 #endif
 337
 338 #ifdef MALLOC_DECLARE
 339 MALLOC_DECLARE(M_PCB);
 340 MALLOC_DECLARE(M_SONAME);
 341 #endif
 342
 343 extern int      maxsockets;
 344 extern u_long   sb_max;
 345 extern int socket_zone;
 346 extern so_gen_t so_gencnt;
 347
 348 struct file;
 349 struct filedesc;
 350 struct mbuf;
 351 struct sockaddr;
 352 struct stat;
 353 struct ucred;
 354 struct uio;
 355 struct knote;
 356
 357 /*
 358  * From uipc_socket and friends
 359  */
 360 __BEGIN_DECLS
 361 struct  sockaddr *dup_sockaddr(struct sockaddr *sa, int canwait);
 362 int     getsock(struct filedesc *fdp, int fd, struct file **fpp);
 363 int     sockargs(struct mbuf **mp, user_addr_t data, int buflen, int type);
 364 int     getsockaddr(struct sockaddr **namp, user_addr_t uaddr, size_t len);
 365 int     sbappend(struct sockbuf *sb, struct mbuf *m);
 366 int     sbappendaddr(struct sockbuf *sb, struct sockaddr *asa,
 367             struct mbuf *m0, struct mbuf *control, int *error_out);
 368 int     sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
 369             struct mbuf *control, int *error_out);
 370 int     sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
 371 void    sbcheck(struct sockbuf *sb);
 372 int     sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
 373 struct mbuf *
 374         sbcreatecontrol(caddr_t p, int size, int type, int level);
 375 void    sbdrop(struct sockbuf *sb, int len);
 376 void    sbdroprecord(struct sockbuf *sb);
 377 void    sbflush(struct sockbuf *sb);
 378 int             sbinsertoob(struct sockbuf *sb, struct mbuf *m0);
 379 void    sbrelease(struct sockbuf *sb);
 380 int     sbreserve(struct sockbuf *sb, u_long cc);
 381 void    sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
 382 int     sbwait(struct sockbuf *sb);
 383 int     sb_lock(struct sockbuf *sb);
 384 int     soabort(struct socket *so);
 385 int     soaccept(struct socket *so, struct sockaddr **nam);
 386 int     soacceptlock (struct socket *so, struct sockaddr **nam, int dolock);
 387 struct  socket *soalloc(int waitok, int dom, int type);
 388 int     sobind(struct socket *so, struct sockaddr *nam);
 389 void    socantrcvmore(struct socket *so);
 390 void    socantsendmore(struct socket *so);
 391 int     soclose(struct socket *so);
 392 int     soconnect(struct socket *so, struct sockaddr *nam);
 393 int     soconnectlock (struct socket *so, struct sockaddr *nam, int dolock);
 394 int     soconnect2(struct socket *so1, struct socket *so2);
 395 int     socreate(int dom, struct socket **aso, int type, int proto);
 396 void    sodealloc(struct socket *so);
 397 int     sodisconnect(struct socket *so);
 398 void    sofree(struct socket *so);
 399 int     sogetopt(struct socket *so, struct sockopt *sopt);
 400 void    sohasoutofband(struct socket *so);
 401 void    soisconnected(struct socket *so);
 402 void    soisconnecting(struct socket *so);
 403 void    soisdisconnected(struct socket *so);
 404 void    soisdisconnecting(struct socket *so);
 405 int     solisten(struct socket *so, int backlog);
 406 struct socket *
 407         sodropablereq(struct socket *head);
 408 struct socket *
 409         sonewconn(struct socket *head, int connstatus, const struct sockaddr* from);
 410 int     sooptcopyin(struct sockopt *sopt, void *data, size_t len, size_t minlen);
 411 int     sooptcopyout(struct sockopt *sopt, void *data, size_t len);
 412 int     socket_lock(struct socket *so, int refcount);
 413 int     socket_unlock(struct socket *so, int refcount);
 414
 415 /*
 416  * XXX; prepare mbuf for (__FreeBSD__ < 3) routines.
 417  * Used primarily in IPSec and IPv6 code.
 418  */
 419 int     soopt_getm(struct sockopt *sopt, struct mbuf **mp);
 420 int     soopt_mcopyin(struct sockopt *sopt, struct mbuf *m);
 421 int     soopt_mcopyout(struct sockopt *sopt, struct mbuf *m);
 422
 423 int     sopoll(struct socket *so, int events, struct ucred *cred, void *wql);
 424 int     soreceive(struct socket *so, struct sockaddr **paddr,
 425                        struct uio *uio, struct mbuf **mp0,
 426                        struct mbuf **controlp, int *flagsp);
 427 int     soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
 428 void    sorflush(struct socket *so);
 429 int     sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
 430                     struct mbuf *top, struct mbuf *control, int flags);
 431
 432 int     sosetopt(struct socket *so, struct sockopt *sopt);
 433 int     soshutdown(struct socket *so, int how);
 434 void    sotoxsocket(struct socket *so, struct xsocket *xso);
 435 void    sowakeup(struct socket *so, struct sockbuf *sb);
 436 int     soioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p);
 437
 438 #ifndef __APPLE__
 439 /* accept filter functions */
 440 int     accept_filt_add(struct accept_filter *filt);
 441 int     accept_filt_del(char *name);
 442 struct accept_filter *  accept_filt_get(char *name);
 443 #ifdef ACCEPT_FILTER_MOD
 444 int accept_filt_generic_mod_event(module_t mod, int event, void *data);
 445 SYSCTL_DECL(_net_inet_accf);
 446 #endif /* ACCEPT_FILTER_MOD */
 447 #endif /* !defined(__APPLE__) */
 448
 449 __END_DECLS
 450
 451 #endif /* KERNEL */
 452 #endif /* KERNEL_PRIVATE */
 453
 454 #endif /* !_SYS_SOCKETVAR_H_ */