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 * 4. 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 * 31 * $FreeBSD: stable/10/sys/sys/socketvar.h 321021 2017-07-15 17:28:03Z dchagin $ 32 */ 33 34 #ifndef _SYS_SOCKETVAR_H_ 35 #define _SYS_SOCKETVAR_H_ 36 37 #include <sys/queue.h> /* for TAILQ macros */ 38 #include <sys/selinfo.h> /* for struct selinfo */ 39 #include <sys/_lock.h> 40 #include <sys/_mutex.h> 41 #include <sys/_sx.h> 42 #include <sys/sockbuf.h> 43 #include <sys/sockstate.h> 44 #ifdef _KERNEL 45 #include <sys/caprights.h> 46 #include <sys/sockopt.h> 47 #endif 48 49 struct vnet; 50 51 /* 52 * Kernel structure per socket. 53 * Contains send and receive buffer queues, 54 * handle on protocol and pointer to protocol 55 * private data and error information. 56 */ 57 typedef u_quad_t so_gen_t; 58 59 struct socket; 60 61 /*- 62 * Locking key to struct socket: 63 * (a) constant after allocation, no locking required. 64 * (b) locked by SOCK_LOCK(so). 65 * (c) locked by SOCKBUF_LOCK(&so->so_rcv). 66 * (d) locked by SOCKBUF_LOCK(&so->so_snd). 67 * (e) locked by ACCEPT_LOCK(). 68 * (f) not locked since integer reads/writes are atomic. 69 * (g) used only as a sleep/wakeup address, no value. 70 * (h) locked by global mutex so_global_mtx. 71 */ 72 struct socket { 73 int so_count; /* (b) reference count */ 74 short so_type; /* (a) generic type, see socket.h */ 75 short so_options; /* from socket call, see socket.h */ 76 short so_linger; /* time to linger while closing */ 77 short so_state; /* (b) internal state flags SS_* */ 78 int so_qstate; /* (e) internal state flags SQ_* */ 79 void *so_pcb; /* protocol control block */ 80 struct vnet *so_vnet; /* (a) network stack instance */ 81 struct protosw *so_proto; /* (a) protocol handle */ 82 /* 83 * Variables for connection queuing. 84 * Socket where accepts occur is so_head in all subsidiary sockets. 85 * If so_head is 0, socket is not related to an accept. 86 * For head socket so_incomp queues partially completed connections, 87 * while so_comp is a queue of connections ready to be accepted. 88 * If a connection is aborted and it has so_head set, then 89 * it has to be pulled out of either so_incomp or so_comp. 90 * We allow connections to queue up based on current queue lengths 91 * and limit on number of queued connections for this socket. 92 */ 93 struct socket *so_head; /* (e) back pointer to listen socket */ 94 TAILQ_HEAD(, socket) so_incomp; /* (e) queue of partial unaccepted connections */ 95 TAILQ_HEAD(, socket) so_comp; /* (e) queue of complete unaccepted connections */ 96 TAILQ_ENTRY(socket) so_list; /* (e) list of unaccepted connections */ 97 u_short so_qlen; /* (e) number of unaccepted connections */ 98 u_short so_incqlen; /* (e) number of unaccepted incomplete 99 connections */ 100 u_short so_qlimit; /* (e) max number queued connections */ 101 short so_timeo; /* (g) connection timeout */ 102 u_short so_error; /* (f) error affecting connection */ 103 struct sigio *so_sigio; /* [sg] information for async I/O or 104 out of band data (SIGURG) */ 105 u_long so_oobmark; /* (c) chars to oob mark */ 106 TAILQ_HEAD(, aiocblist) so_aiojobq; /* AIO ops waiting on socket */ 107 108 struct sockbuf so_rcv, so_snd; 109 110 struct ucred *so_cred; /* (a) user credentials */ 111 struct label *so_label; /* (b) MAC label for socket */ 112 struct label *so_peerlabel; /* (b) cached MAC label for peer */ 113 /* NB: generation count must not be first. */ 114 so_gen_t so_gencnt; /* (h) generation count */ 115 void *so_emuldata; /* (b) private data for emulators */ 116 struct so_accf { 117 struct accept_filter *so_accept_filter; 118 void *so_accept_filter_arg; /* saved filter args */ 119 char *so_accept_filter_str; /* saved user args */ 120 } *so_accf; 121 /* 122 * so_fibnum, so_user_cookie and friends can be used to attach 123 * some user-specified metadata to a socket, which then can be 124 * used by the kernel for various actions. 125 * so_user_cookie is used by ipfw/dummynet. 126 */ 127 int so_fibnum; /* routing domain for this socket */ 128 uint32_t so_user_cookie; 129 }; 130 131 /* 132 * Global accept mutex to serialize access to accept queues and 133 * fields associated with multiple sockets. This allows us to 134 * avoid defining a lock order between listen and accept sockets 135 * until such time as it proves to be a good idea. 136 */ 137 extern struct mtx accept_mtx; 138 #define ACCEPT_LOCK_ASSERT() mtx_assert(&accept_mtx, MA_OWNED) 139 #define ACCEPT_UNLOCK_ASSERT() mtx_assert(&accept_mtx, MA_NOTOWNED) 140 #define ACCEPT_LOCK() mtx_lock(&accept_mtx) 141 #define ACCEPT_UNLOCK() mtx_unlock(&accept_mtx) 142 143 /* 144 * Per-socket mutex: we reuse the receive socket buffer mutex for space 145 * efficiency. This decision should probably be revisited as we optimize 146 * locking for the socket code. 147 */ 148 #define SOCK_MTX(_so) SOCKBUF_MTX(&(_so)->so_rcv) 149 #define SOCK_LOCK(_so) SOCKBUF_LOCK(&(_so)->so_rcv) 150 #define SOCK_OWNED(_so) SOCKBUF_OWNED(&(_so)->so_rcv) 151 #define SOCK_UNLOCK(_so) SOCKBUF_UNLOCK(&(_so)->so_rcv) 152 #define SOCK_LOCK_ASSERT(_so) SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv) 153 154 /* 155 * Socket state bits stored in so_qstate. 156 */ 157 #define SQ_INCOMP 0x0800 /* unaccepted, incomplete connection */ 158 #define SQ_COMP 0x1000 /* unaccepted, complete connection */ 159 160 /* 161 * Externalized form of struct socket used by the sysctl(3) interface. 162 */ 163 struct xsocket { 164 size_t xso_len; /* length of this structure */ 165 struct socket *xso_so; /* makes a convenient handle sometimes */ 166 short so_type; 167 short so_options; 168 short so_linger; 169 short so_state; 170 caddr_t so_pcb; /* another convenient handle */ 171 int xso_protocol; 172 int xso_family; 173 u_short so_qlen; 174 u_short so_incqlen; 175 u_short so_qlimit; 176 short so_timeo; 177 u_short so_error; 178 pid_t so_pgid; 179 u_long so_oobmark; 180 struct xsockbuf so_rcv, so_snd; 181 uid_t so_uid; /* XXX */ 182 }; 183 184 #ifdef _KERNEL 185 186 /* 187 * Macros for sockets and socket buffering. 188 */ 189 190 /* 191 * Flags to sblock(). 192 */ 193 #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */ 194 #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */ 195 #define SBL_VALID (SBL_WAIT | SBL_NOINTR) 196 197 /* 198 * Do we need to notify the other side when I/O is possible? 199 */ 200 #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \ 201 SB_UPCALL | SB_AIO | SB_KNOTE)) != 0) 202 203 /* do we have to send all at once on a socket? */ 204 #define sosendallatonce(so) \ 205 ((so)->so_proto->pr_flags & PR_ATOMIC) 206 207 /* can we read something from so? */ 208 #define soreadabledata(so) \ 209 ((so)->so_rcv.sb_cc >= (so)->so_rcv.sb_lowat || \ 210 !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error) 211 #define soreadable(so) \ 212 (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE)) 213 214 /* can we write something to so? */ 215 #define sowriteable(so) \ 216 ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \ 217 (((so)->so_state&SS_ISCONNECTED) || \ 218 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \ 219 ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \ 220 (so)->so_error) 221 222 /* 223 * soref()/sorele() ref-count the socket structure. Note that you must 224 * still explicitly close the socket, but the last ref count will free 225 * the structure. 226 */ 227 #define soref(so) do { \ 228 SOCK_LOCK_ASSERT(so); \ 229 ++(so)->so_count; \ 230 } while (0) 231 232 #define sorele(so) do { \ 233 ACCEPT_LOCK_ASSERT(); \ 234 SOCK_LOCK_ASSERT(so); \ 235 if ((so)->so_count <= 0) \ 236 panic("sorele"); \ 237 if (--(so)->so_count == 0) \ 238 sofree(so); \ 239 else { \ 240 SOCK_UNLOCK(so); \ 241 ACCEPT_UNLOCK(); \ 242 } \ 243 } while (0) 244 245 /* 246 * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to 247 * avoid a non-atomic test-and-wakeup. However, sowakeup is 248 * responsible for releasing the lock if it is called. We unlock only 249 * if we don't call into sowakeup. If any code is introduced that 250 * directly invokes the underlying sowakeup() primitives, it must 251 * maintain the same semantics. 252 */ 253 #define sorwakeup_locked(so) do { \ 254 SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \ 255 if (sb_notify(&(so)->so_rcv)) \ 256 sowakeup((so), &(so)->so_rcv); \ 257 else \ 258 SOCKBUF_UNLOCK(&(so)->so_rcv); \ 259 } while (0) 260 261 #define sorwakeup(so) do { \ 262 SOCKBUF_LOCK(&(so)->so_rcv); \ 263 sorwakeup_locked(so); \ 264 } while (0) 265 266 #define sowwakeup_locked(so) do { \ 267 SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \ 268 if (sb_notify(&(so)->so_snd)) \ 269 sowakeup((so), &(so)->so_snd); \ 270 else \ 271 SOCKBUF_UNLOCK(&(so)->so_snd); \ 272 } while (0) 273 274 #define sowwakeup(so) do { \ 275 SOCKBUF_LOCK(&(so)->so_snd); \ 276 sowwakeup_locked(so); \ 277 } while (0) 278 279 struct accept_filter { 280 char accf_name[16]; 281 int (*accf_callback) 282 (struct socket *so, void *arg, int waitflag); 283 void * (*accf_create) 284 (struct socket *so, char *arg); 285 void (*accf_destroy) 286 (struct socket *so); 287 SLIST_ENTRY(accept_filter) accf_next; 288 }; 289 290 #ifdef MALLOC_DECLARE 291 MALLOC_DECLARE(M_ACCF); 292 MALLOC_DECLARE(M_PCB); 293 MALLOC_DECLARE(M_SONAME); 294 #endif 295 296 extern int maxsockets; 297 extern u_long sb_max; 298 extern so_gen_t so_gencnt; 299 300 struct file; 301 struct filedesc; 302 struct mbuf; 303 struct sockaddr; 304 struct ucred; 305 struct uio; 306 307 /* 'which' values for socket upcalls. */ 308 #define SO_RCV 1 309 #define SO_SND 2 310 311 /* Return values for socket upcalls. */ 312 #define SU_OK 0 313 #define SU_ISCONNECTED 1 314 315 /* 316 * From uipc_socket and friends 317 */ 318 int sockargs(struct mbuf **mp, caddr_t buf, int buflen, int type); 319 int getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len); 320 int getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp, 321 struct file **fpp, u_int *fflagp); 322 void soabort(struct socket *so); 323 int soaccept(struct socket *so, struct sockaddr **nam); 324 int socheckuid(struct socket *so, uid_t uid); 325 int sobind(struct socket *so, struct sockaddr *nam, struct thread *td); 326 int sobindat(int fd, struct socket *so, struct sockaddr *nam, 327 struct thread *td); 328 int soclose(struct socket *so); 329 int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td); 330 int soconnectat(int fd, struct socket *so, struct sockaddr *nam, 331 struct thread *td); 332 int soconnect2(struct socket *so1, struct socket *so2); 333 int socreate(int dom, struct socket **aso, int type, int proto, 334 struct ucred *cred, struct thread *td); 335 int sodisconnect(struct socket *so); 336 struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags); 337 void sofree(struct socket *so); 338 void sohasoutofband(struct socket *so); 339 int solisten(struct socket *so, int backlog, struct thread *td); 340 void solisten_proto(struct socket *so, int backlog); 341 int solisten_proto_check(struct socket *so); 342 struct socket * 343 sonewconn(struct socket *head, int connstatus); 344 345 346 int sopoll(struct socket *so, int events, struct ucred *active_cred, 347 struct thread *td); 348 int sopoll_generic(struct socket *so, int events, 349 struct ucred *active_cred, struct thread *td); 350 int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio, 351 struct mbuf **mp0, struct mbuf **controlp, int *flagsp); 352 int soreceive_stream(struct socket *so, struct sockaddr **paddr, 353 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, 354 int *flagsp); 355 int soreceive_dgram(struct socket *so, struct sockaddr **paddr, 356 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, 357 int *flagsp); 358 int soreceive_generic(struct socket *so, struct sockaddr **paddr, 359 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, 360 int *flagsp); 361 int soreserve(struct socket *so, u_long sndcc, u_long rcvcc); 362 void sorflush(struct socket *so); 363 int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio, 364 struct mbuf *top, struct mbuf *control, int flags, 365 struct thread *td); 366 int sosend_dgram(struct socket *so, struct sockaddr *addr, 367 struct uio *uio, struct mbuf *top, struct mbuf *control, 368 int flags, struct thread *td); 369 int sosend_generic(struct socket *so, struct sockaddr *addr, 370 struct uio *uio, struct mbuf *top, struct mbuf *control, 371 int flags, struct thread *td); 372 int soshutdown(struct socket *so, int how); 373 void sotoxsocket(struct socket *so, struct xsocket *xso); 374 void soupcall_clear(struct socket *so, int which); 375 void soupcall_set(struct socket *so, int which, 376 int (*func)(struct socket *, void *, int), void *arg); 377 void sowakeup(struct socket *so, struct sockbuf *sb); 378 int selsocket(struct socket *so, int events, struct timeval *tv, 379 struct thread *td); 380 381 /* 382 * Accept filter functions (duh). 383 */ 384 int accept_filt_add(struct accept_filter *filt); 385 int accept_filt_del(char *name); 386 struct accept_filter *accept_filt_get(char *name); 387 #ifdef ACCEPT_FILTER_MOD 388 #ifdef SYSCTL_DECL 389 SYSCTL_DECL(_net_inet_accf); 390 #endif 391 int accept_filt_generic_mod_event(module_t mod, int event, void *data); 392 #endif 393 394 #endif /* _KERNEL */ 395 396 #endif /* !_SYS_SOCKETVAR_H_ */ 397