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_ */ 497