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 1.35 2008/08/28 23:15:45 dillon Exp $ 36 */ 37 38 #ifndef _SYS_SOCKETVAR_H_ 39 #define _SYS_SOCKETVAR_H_ 40 41 #ifndef _SYS_TYPES_H_ 42 #include <sys/types.h> 43 #endif 44 #ifndef _SYS_QUEUE_H_ 45 #include <sys/queue.h> /* for TAILQ macros */ 46 #endif 47 #ifndef _SYS_EVENT_H_ 48 #include <sys/event.h> /* for struct kqinfo */ 49 #endif 50 #ifndef _SYS_THREAD_H_ 51 #include <sys/thread.h> /* for struct lwkt_token */ 52 #endif 53 #ifndef _SYS_SOCKBUF_H_ 54 #include <sys/sockbuf.h> 55 #endif 56 57 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 58 59 #ifndef _NET_NETMSG_H_ 60 #include <net/netmsg.h> 61 #endif 62 63 #ifndef _SYS_SPINLOCK_H_ 64 #include <sys/spinlock.h> 65 #endif 66 67 struct accept_filter; 68 69 /* 70 * Signaling socket buffers contain additional elements for locking 71 * and signaling conditions. These are used primarily by sockets. 72 * 73 * WARNING: See partial clearing of fields in kern/uipc_socket.c 74 * sorflush() and sowflush(). 75 */ 76 struct signalsockbuf { 77 struct sockbuf sb; 78 struct kqinfo ssb_kq; /* process selecting read/write */ 79 uint32_t ssb_flags; /* flags, see below (use atomic ops) */ 80 u_int ssb_timeo; /* timeout for read/write */ 81 long ssb_lowat; /* low water mark */ 82 u_long ssb_hiwat; /* high water mark / max actual char count */ 83 u_long ssb_mbmax; /* max chars of mbufs to use */ 84 struct lwkt_token ssb_token; /* frontend/backend serializer */ 85 }; 86 87 #define ssb_cc sb.sb_cc /* commonly used fields */ 88 #define ssb_mb sb.sb_mb /* commonly used fields */ 89 #define ssb_mbcnt sb.sb_mbcnt /* commonly used fields */ 90 #define ssb_cc_prealloc sb.sb_cc_prealloc 91 #define ssb_mbcnt_prealloc sb.sb_mbcnt_prealloc 92 93 #define SSB_LOCK 0x0001 /* lock on data queue */ 94 #define SSB_WANT 0x0002 /* someone is waiting to lock */ 95 #define SSB_WAIT 0x0004 /* someone is waiting for data/space */ 96 #define SSB_ASYNC 0x0010 /* ASYNC I/O, need signals */ 97 #define SSB_UPCALL 0x0020 /* someone wants an upcall */ 98 #define SSB_NOINTR 0x0040 /* operations not interruptible */ 99 /*#define SSB_AIO 0x0080*/ /* AIO operations queued */ 100 #define SSB_KNOTE 0x0100 /* kernel note attached */ 101 #define SSB_MEVENT 0x0200 /* need message event notification */ 102 #define SSB_STOP 0x0400 /* backpressure indicator */ 103 #define SSB_AUTOSIZE 0x0800 /* automatically size socket buffer */ 104 #define SSB_AUTOLOWAT 0x1000 /* automatically scale lowat */ 105 #define SSB_WAKEUP 0x2000 /* wakeup event race */ 106 #define SSB_PREALLOC 0x4000 /* prealloc supported */ 107 #define SSB_STOPSUPP 0x8000 /* SSB_STOP supported */ 108 109 #define SSB_CLEAR_MASK (SSB_ASYNC | SSB_UPCALL | SSB_STOP | \ 110 SSB_AUTOSIZE | SSB_AUTOLOWAT) 111 112 #define SSB_NOTIFY_MASK (SSB_WAIT | SSB_ASYNC | SSB_UPCALL | \ 113 SSB_KNOTE | SSB_MEVENT) 114 115 /* 116 * Per-socket kernel structure. Contains universal send and receive queues, 117 * protocol control handle, and error information. 118 */ 119 struct socket { 120 short so_type; /* generic type, see socket.h */ 121 short so_options; /* from socket call, see socket.h */ 122 short so_linger; /* time to linger while closing */ 123 short so_state; /* internal state flags SS_*, below */ 124 void *so_pcb; /* protocol control block */ 125 struct protosw *so_proto; /* protocol handle */ 126 struct socket *so_head; /* back pointer to accept socket */ 127 lwkt_port_t so_port; /* message port */ 128 129 /* 130 * These fields are used to manage sockets capable of accepting 131 * new connections. 132 */ 133 TAILQ_HEAD(, socket) so_incomp; /* in-progress, incomplete */ 134 TAILQ_HEAD(, socket) so_comp; /* completed but not yet accepted */ 135 TAILQ_ENTRY(socket) so_list; /* list of unaccepted connections */ 136 short so_qlen; /* so_comp count */ 137 short so_incqlen; /* so_incomp count */ 138 short so_qlimit; /* max number queued connections */ 139 140 /* 141 * Misc socket support 142 */ 143 short so_timeo; /* connection timeout */ 144 u_short so_error; /* error affecting connection */ 145 struct sigio *so_sigio; /* information for async I/O or 146 out of band data (SIGURG) */ 147 u_long so_oobmark; /* chars to oob mark */ 148 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */ 149 struct signalsockbuf so_rcv; 150 struct signalsockbuf so_snd; 151 152 void (*so_upcall) (struct socket *, void *, int); 153 void *so_upcallarg; 154 struct ucred *so_cred; /* user credentials */ 155 /* NB: generation count must not be first; easiest to make it last. */ 156 void *so_emuldata; /* private data for emulators */ 157 int so_refs; /* shutdown refs */ 158 struct so_accf { 159 struct accept_filter *so_accept_filter; 160 void *so_accept_filter_arg; /* saved filter args */ 161 char *so_accept_filter_str; /* saved user args */ 162 } *so_accf; 163 164 struct netmsg_base so_clomsg; 165 struct sockaddr *so_faddr; 166 167 struct spinlock so_rcvd_spin; 168 struct netmsg_pru_rcvd so_rcvd_msg; 169 170 lwkt_port_t so_orig_port; 171 }; 172 173 #endif 174 175 /* 176 * Socket state bits. 177 * 178 * NOTE: The following states are interlocked with so_refs: 179 * 180 * SS_NOFDREF so_refs while not set 181 * (so_pcb) so_refs while set 182 */ 183 #define SS_NOFDREF 0x0001 /* no file table ref any more */ 184 #define SS_ISCONNECTED 0x0002 /* socket connected to a peer */ 185 #define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */ 186 #define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */ 187 #define SS_CANTSENDMORE 0x0010 /* can't send more data to peer */ 188 #define SS_CANTRCVMORE 0x0020 /* can't receive more data from peer */ 189 #define SS_RCVATMARK 0x0040 /* at mark on input */ 190 191 #define SS_ISCLOSING 0x0080 /* in process of closing */ 192 #define SS_ASSERTINPROG 0x0100 /* sonewconn race debugging */ 193 #define SS_ASYNC 0x0200 /* async i/o notify */ 194 #define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */ 195 196 #define SS_INCOMP 0x0800 /* unaccepted, incomplete connection */ 197 #define SS_COMP 0x1000 /* unaccepted, complete connection */ 198 #define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */ 199 200 /* 201 * Externalized form of struct socket used by the sysctl(3) interface. 202 */ 203 struct xsocket { 204 size_t xso_len; /* length of this structure */ 205 struct socket *xso_so; /* makes a convenient handle sometimes */ 206 short so_type; 207 short so_options; 208 short so_linger; 209 short so_state; 210 void *so_pcb; /* another convenient handle */ 211 int xso_protocol; 212 int xso_family; 213 short so_qlen; 214 short so_incqlen; 215 short so_qlimit; 216 short so_timeo; 217 u_short so_error; 218 pid_t so_pgid; 219 u_long so_oobmark; 220 struct xsockbuf { 221 u_long sb_cc; 222 u_long sb_hiwat; 223 u_long sb_mbcnt; 224 u_long sb_mbmax; 225 long sb_lowat; 226 u_int sb_timeo; 227 short sb_flags; 228 } so_rcv, so_snd; 229 uid_t so_uid; /* XXX */ 230 }; 231 232 /* 233 * Macros for sockets and socket buffering. 234 */ 235 236 #define sosendallatonce(so) \ 237 ((so)->so_proto->pr_flags & PR_ATOMIC) 238 239 /* can we read something from so? */ 240 #define soreadable(so) \ 241 ((so)->so_rcv.ssb_cc >= (so)->so_rcv.ssb_lowat || \ 242 ((so)->so_state & SS_CANTRCVMORE) || \ 243 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error) 244 245 /* can we write something to so? */ 246 #define sowriteable(so) \ 247 ((ssb_space(&(so)->so_snd) >= (so)->so_snd.ssb_lowat && \ 248 (((so)->so_state&SS_ISCONNECTED) || \ 249 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \ 250 ((so)->so_state & SS_CANTSENDMORE) || \ 251 (so)->so_error) 252 253 /* do we have to send all at once on a socket? */ 254 255 #ifdef _KERNEL 256 257 /* 258 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)? 259 * This is problematical if the fields are unsigned, as the space might 260 * still be negative (cc > hiwat or mbcnt > mbmax). Should detect 261 * overflow and return 0. 262 * 263 * SSB_STOP ignores cc/hiwat and returns 0. This is used by unix domain 264 * stream sockets to signal backpressure. 265 */ 266 static __inline 267 long 268 ssb_space(struct signalsockbuf *ssb) 269 { 270 long bleft; 271 long mleft; 272 273 if (ssb->ssb_flags & SSB_STOP) 274 return(0); 275 bleft = ssb->ssb_hiwat - ssb->ssb_cc; 276 mleft = ssb->ssb_mbmax - ssb->ssb_mbcnt; 277 return((bleft < mleft) ? bleft : mleft); 278 } 279 280 static __inline long 281 ssb_space_prealloc(struct signalsockbuf *ssb) 282 { 283 long bleft, bleft_prealloc; 284 long mleft, mleft_prealloc; 285 286 if (ssb->ssb_flags & SSB_STOP) 287 return(0); 288 289 bleft = ssb->ssb_hiwat - ssb->ssb_cc; 290 bleft_prealloc = ssb->ssb_hiwat - ssb->ssb_cc_prealloc; 291 if (bleft_prealloc < bleft) 292 bleft = bleft_prealloc; 293 294 mleft = ssb->ssb_mbmax - ssb->ssb_mbcnt; 295 mleft_prealloc = ssb->ssb_mbmax - ssb->ssb_mbcnt_prealloc; 296 if (mleft_prealloc < mleft) 297 mleft = mleft_prealloc; 298 299 return((bleft < mleft) ? bleft : mleft); 300 } 301 302 /* 303 * NOTE: Only works w/ later ssb_appendstream() on m 304 */ 305 static __inline void 306 ssb_preallocstream(struct signalsockbuf *ssb, struct mbuf *m) 307 { 308 if (m->m_len == 0) 309 return; 310 sbprealloc(&ssb->sb, m); 311 } 312 313 #endif 314 315 #define ssb_append(ssb, m) \ 316 sbappend(&(ssb)->sb, m) 317 318 #define ssb_appendstream(ssb, m) \ 319 sbappendstream(&(ssb)->sb, m) 320 321 #define ssb_appendrecord(ssb, m) \ 322 sbappendrecord(&(ssb)->sb, m) 323 324 #define ssb_appendaddr(ssb, src, m, control) \ 325 ((ssb_space(ssb) <= 0) ? 0 : sbappendaddr(&(ssb)->sb, src, m, control)) 326 327 #define ssb_appendcontrol(ssb, m, control) \ 328 ((ssb_space(ssb) <= 0) ? 0 : sbappendcontrol(&(ssb)->sb, m, control)) 329 330 #define ssb_insert_knote(ssb, kn) { \ 331 knote_insert(&(ssb)->ssb_kq.ki_note, kn); \ 332 atomic_set_int(&(ssb)->ssb_flags, SSB_KNOTE); \ 333 } 334 335 #define ssb_remove_knote(ssb, kn) { \ 336 knote_remove(&(ssb)->ssb_kq.ki_note, kn); \ 337 if (SLIST_EMPTY(&(ssb)->ssb_kq.ki_note)) \ 338 atomic_clear_int(&(ssb)->ssb_flags, SSB_KNOTE); \ 339 } 340 341 #define sorwakeup(so) sowakeup((so), &(so)->so_rcv) 342 #define sowwakeup(so) sowakeup((so), &(so)->so_snd) 343 344 #ifdef _KERNEL 345 346 /* 347 * Argument structure for sosetopt et seq. This is in the KERNEL 348 * section because it will never be visible to user code. 349 */ 350 enum sopt_dir { SOPT_GET, SOPT_SET }; 351 struct sockopt { 352 enum sopt_dir sopt_dir; /* is this a get or a set? */ 353 int sopt_level; /* second arg of [gs]etsockopt */ 354 int sopt_name; /* third arg of [gs]etsockopt */ 355 void *sopt_val; /* fourth arg of [gs]etsockopt */ 356 size_t sopt_valsize; /* (almost) fifth arg of [gs]etsockopt */ 357 struct thread *sopt_td; /* calling thread or null if kernel */ 358 }; 359 360 struct accept_filter { 361 char accf_name[16]; 362 void (*accf_callback) 363 (struct socket *so, void *arg, int waitflag); 364 void * (*accf_create) 365 (struct socket *so, char *arg); 366 void (*accf_destroy) 367 (struct socket *so); 368 SLIST_ENTRY(accept_filter) accf_next; /* next on the list */ 369 }; 370 371 #ifdef MALLOC_DECLARE 372 MALLOC_DECLARE(M_PCB); 373 MALLOC_DECLARE(M_SONAME); 374 MALLOC_DECLARE(M_ACCF); 375 #endif 376 377 extern int maxsockets; 378 extern u_long sb_max; /* nominal limit */ 379 extern u_long sb_max_adj; /* actual limit used by sbreserve() */ 380 381 struct file; 382 struct filedesc; 383 struct mbuf; 384 struct rlimit; 385 struct sockaddr; 386 struct stat; 387 struct ucred; 388 struct uio; 389 struct knote; 390 struct sysmsg; 391 392 /* 393 * File operations on sockets. 394 */ 395 int soo_read (struct file *fp, struct uio *uio, struct ucred *cred, 396 int flags); 397 int soo_write (struct file *fp, struct uio *uio, struct ucred *cred, 398 int flags); 399 int soo_close (struct file *fp); 400 int soo_shutdown (struct file *fp, int how); 401 int soo_ioctl (struct file *fp, u_long cmd, caddr_t data, 402 struct ucred *cred, struct sysmsg *msg); 403 int soo_stat (struct file *fp, struct stat *ub, struct ucred *cred); 404 int sokqfilter (struct file *fp, struct knote *kn); 405 406 /* 407 * From uipc_socket and friends 408 */ 409 struct sockaddr *dup_sockaddr (const struct sockaddr *sa); 410 int getsockaddr (struct sockaddr **namp, caddr_t uaddr, size_t len); 411 412 void ssb_release (struct signalsockbuf *ssb, struct socket *so); 413 int ssb_reserve (struct signalsockbuf *ssb, u_long cc, struct socket *so, 414 struct rlimit *rl); 415 void ssbtoxsockbuf (struct signalsockbuf *sb, struct xsockbuf *xsb); 416 int ssb_wait (struct signalsockbuf *sb); 417 int _ssb_lock (struct signalsockbuf *sb); 418 419 void soabort_async (struct socket *so, boolean_t clr_head); 420 void soabort_direct (struct socket *so); 421 int soaccept (struct socket *so, struct sockaddr **nam); 422 void soaccept_generic (struct socket *so); 423 struct socket *soalloc (int waitok, struct protosw *); 424 int sobind (struct socket *so, struct sockaddr *nam, struct thread *td); 425 void socantrcvmore (struct socket *so); 426 void socantsendmore (struct socket *so); 427 int socket_wait (struct socket *so, struct timespec *ts, int *res); 428 int soclose (struct socket *so, int fflags); 429 int soconnect (struct socket *so, struct sockaddr *nam, struct thread *td, 430 boolean_t sync); 431 int soconnect2 (struct socket *so1, struct socket *so2); 432 int socreate (int dom, struct socket **aso, int type, int proto, 433 struct thread *td); 434 int sodisconnect (struct socket *so); 435 void sodiscard (struct socket *so); 436 void sofree (struct socket *so); 437 int sogetopt (struct socket *so, struct sockopt *sopt); 438 void sohasoutofband (struct socket *so); 439 void soisconnected (struct socket *so); 440 void soisconnecting (struct socket *so); 441 void soisdisconnected (struct socket *so); 442 void soisdisconnecting (struct socket *so); 443 void soisreconnected (struct socket *so); 444 void soisreconnecting (struct socket *so); 445 void sosetport (struct socket *so, struct lwkt_port *port); 446 int solisten (struct socket *so, int backlog, struct thread *td); 447 struct socket *sonewconn (struct socket *head, int connstatus); 448 struct socket *sonewconn_faddr (struct socket *head, int connstatus, 449 const struct sockaddr *faddr, boolean_t keep_ref); 450 void soinherit(struct socket *so, struct socket *so_inh); 451 int sooptcopyin (struct sockopt *sopt, void *buf, size_t len, 452 size_t minlen); 453 int soopt_to_kbuf (struct sockopt *sopt, void *buf, size_t len, 454 size_t minlen); 455 int sooptcopyout (struct sockopt *sopt, const void *buf, size_t len); 456 void soopt_from_kbuf (struct sockopt *sopt, const void *buf, size_t len); 457 458 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ 459 int soopt_getm (struct sockopt *sopt, struct mbuf **mp); 460 int soopt_mcopyin (struct sockopt *sopt, struct mbuf *m); 461 void soopt_to_mbuf (struct sockopt *sopt, struct mbuf *m); 462 int soopt_mcopyout (struct sockopt *sopt, struct mbuf *m); 463 int soopt_from_mbuf (struct sockopt *sopt, struct mbuf *m); 464 465 int soreceive (struct socket *so, struct sockaddr **paddr, 466 struct uio *uio, struct sockbuf *sio, 467 struct mbuf **controlp, int *flagsp); 468 int sorecvtcp (struct socket *so, struct sockaddr **paddr, 469 struct uio *uio, struct sockbuf *sio, 470 struct mbuf **controlp, int *flagsp); 471 int soreserve (struct socket *so, u_long sndcc, u_long rcvcc, 472 struct rlimit *rl); 473 void sorflush (struct socket *so); 474 int sosend (struct socket *so, struct sockaddr *addr, struct uio *uio, 475 struct mbuf *top, struct mbuf *control, int flags, 476 struct thread *td); 477 int sosendudp (struct socket *so, struct sockaddr *addr, struct uio *uio, 478 struct mbuf *top, struct mbuf *control, int flags, 479 struct thread *td); 480 int sosendtcp (struct socket *so, struct sockaddr *addr, struct uio *uio, 481 struct mbuf *top, struct mbuf *control, int flags, 482 struct thread *td); 483 int sosetopt (struct socket *so, struct sockopt *sopt); 484 int soshutdown (struct socket *so, int how); 485 void sotoxsocket (struct socket *so, struct xsocket *xso); 486 void sowakeup (struct socket *so, struct signalsockbuf *sb); 487 488 /* accept filter functions */ 489 int accept_filt_add (struct accept_filter *filt); 490 int accept_filt_del (char *name); 491 struct accept_filter * accept_filt_get (char *name); 492 #ifdef ACCEPT_FILTER_MOD 493 int accept_filt_generic_mod_event (module_t mod, int event, void *data); 494 SYSCTL_DECL(_net_inet_accf); 495 #endif /* ACCEPT_FILTER_MOD */ 496 497 #endif /* _KERNEL */ 498 499 #endif /* !_SYS_SOCKETVAR_H_ */ 500