1 /* uipc_socket.c 6.3 84/04/24 */ 2 3 #include "../h/param.h" 4 #include "../h/systm.h" 5 #include "../h/dir.h" 6 #include "../h/user.h" 7 #include "../h/proc.h" 8 #include "../h/file.h" 9 #include "../h/inode.h" 10 #include "../h/buf.h" 11 #include "../h/mbuf.h" 12 #include "../h/un.h" 13 #include "../h/protosw.h" 14 #include "../h/socket.h" 15 #include "../h/socketvar.h" 16 #include "../h/stat.h" 17 #include "../h/ioctl.h" 18 #include "../h/uio.h" 19 #include "../net/route.h" 20 #include "../netinet/in.h" 21 #include "../net/if.h" 22 23 /* 24 * Socket operation routines. 25 * These routines are called by the routines in 26 * sys_socket.c or from a system process, and 27 * implement the semantics of socket operations by 28 * switching out to the protocol specific routines. 29 * 30 * TODO: 31 * sostat 32 * test socketpair 33 * PR_RIGHTS 34 * clean up select, async 35 * out-of-band is a kludge 36 */ 37 /*ARGSUSED*/ 38 socreate(dom, aso, type, proto) 39 struct socket **aso; 40 register int type; 41 int proto; 42 { 43 register struct protosw *prp; 44 register struct socket *so; 45 register struct mbuf *m; 46 register int error; 47 48 if (proto) 49 prp = pffindproto(dom, proto); 50 else 51 prp = pffindtype(dom, type); 52 if (prp == 0) 53 return (EPROTONOSUPPORT); 54 if (prp->pr_type != type) 55 return (EPROTOTYPE); 56 m = m_getclr(M_WAIT, MT_SOCKET); 57 if (m == 0) 58 return (ENOBUFS); 59 so = mtod(m, struct socket *); 60 so->so_options = 0; 61 so->so_state = 0; 62 so->so_type = type; 63 if (u.u_uid == 0) 64 so->so_state = SS_PRIV; 65 so->so_proto = prp; 66 error = 67 (*prp->pr_usrreq)(so, PRU_ATTACH, 68 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 69 if (error) { 70 so->so_state |= SS_NOFDREF; 71 sofree(so); 72 return (error); 73 } 74 *aso = so; 75 return (0); 76 } 77 78 sobind(so, nam) 79 struct socket *so; 80 struct mbuf *nam; 81 { 82 int s = splnet(); 83 int error; 84 85 error = 86 (*so->so_proto->pr_usrreq)(so, PRU_BIND, 87 (struct mbuf *)0, nam, (struct mbuf *)0); 88 splx(s); 89 return (error); 90 } 91 92 solisten(so, backlog) 93 register struct socket *so; 94 int backlog; 95 { 96 int s = splnet(), error; 97 98 error = 99 (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, 100 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 101 if (error) { 102 splx(s); 103 return (error); 104 } 105 if (so->so_q == 0) { 106 so->so_q = so; 107 so->so_q0 = so; 108 so->so_options |= SO_ACCEPTCONN; 109 } 110 if (backlog < 0) 111 backlog = 0; 112 so->so_qlimit = MIN(backlog, SOMAXCONN); 113 splx(s); 114 return (0); 115 } 116 117 sofree(so) 118 register struct socket *so; 119 { 120 121 if (so->so_head) { 122 if (!soqremque(so, 0) && !soqremque(so, 1)) 123 panic("sofree dq"); 124 so->so_head = 0; 125 } 126 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 127 return; 128 sbrelease(&so->so_snd); 129 sorflush(so); 130 (void) m_free(dtom(so)); 131 } 132 133 /* 134 * Close a socket on last file table reference removal. 135 * Initiate disconnect if connected. 136 * Free socket when disconnect complete. 137 */ 138 soclose(so) 139 register struct socket *so; 140 { 141 int s = splnet(); /* conservative */ 142 int error; 143 144 if (so->so_options & SO_ACCEPTCONN) { 145 while (so->so_q0 != so) 146 (void) soabort(so->so_q0); 147 while (so->so_q != so) 148 (void) soabort(so->so_q); 149 } 150 if (so->so_pcb == 0) 151 goto discard; 152 if (so->so_state & SS_ISCONNECTED) { 153 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 154 error = sodisconnect(so, (struct mbuf *)0); 155 if (error) 156 goto drop; 157 } 158 if (so->so_options & SO_LINGER) { 159 if ((so->so_state & SS_ISDISCONNECTING) && 160 (so->so_state & SS_NBIO)) 161 goto drop; 162 while (so->so_state & SS_ISCONNECTED) 163 sleep((caddr_t)&so->so_timeo, PZERO+1); 164 } 165 } 166 drop: 167 if (so->so_pcb) { 168 int error2 = 169 (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 170 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 171 if (error == 0) 172 error = error2; 173 } 174 discard: 175 if (so->so_state & SS_NOFDREF) 176 panic("soclose: NOFDREF"); 177 so->so_state |= SS_NOFDREF; 178 sofree(so); 179 splx(s); 180 return (error); 181 } 182 183 /* 184 * Must be called at splnet... 185 */ 186 soabort(so) 187 struct socket *so; 188 { 189 190 return ( 191 (*so->so_proto->pr_usrreq)(so, PRU_ABORT, 192 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 193 } 194 195 soaccept(so, nam) 196 register struct socket *so; 197 struct mbuf *nam; 198 { 199 int s = splnet(); 200 int error; 201 202 if ((so->so_state & SS_NOFDREF) == 0) 203 panic("soaccept: !NOFDREF"); 204 so->so_state &= ~SS_NOFDREF; 205 error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 206 (struct mbuf *)0, nam, (struct mbuf *)0); 207 splx(s); 208 return (error); 209 } 210 211 soconnect(so, nam) 212 register struct socket *so; 213 struct mbuf *nam; 214 { 215 int s = splnet(); 216 int error; 217 218 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) { 219 error = EISCONN; 220 goto bad; 221 } 222 error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 223 (struct mbuf *)0, nam, (struct mbuf *)0); 224 bad: 225 splx(s); 226 return (error); 227 } 228 229 soconnect2(so1, so2) 230 register struct socket *so1; 231 struct socket *so2; 232 { 233 int s = splnet(); 234 int error; 235 236 error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2, 237 (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0); 238 splx(s); 239 return (error); 240 } 241 242 sodisconnect(so, nam) 243 register struct socket *so; 244 struct mbuf *nam; 245 { 246 int s = splnet(); 247 int error; 248 249 if ((so->so_state & SS_ISCONNECTED) == 0) { 250 error = ENOTCONN; 251 goto bad; 252 } 253 if (so->so_state & SS_ISDISCONNECTING) { 254 error = EALREADY; 255 goto bad; 256 } 257 error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 258 (struct mbuf *)0, nam, (struct mbuf *)0); 259 bad: 260 splx(s); 261 return (error); 262 } 263 264 /* 265 * Send on a socket. 266 * If send must go all at once and message is larger than 267 * send buffering, then hard error. 268 * Lock against other senders. 269 * If must go all at once and not enough room now, then 270 * inform user that this would block and do nothing. 271 * Otherwise, if nonblocking, send as much as possible. 272 */ 273 sosend(so, nam, uio, flags, rights) 274 register struct socket *so; 275 struct mbuf *nam; 276 register struct uio *uio; 277 int flags; 278 struct mbuf *rights; 279 { 280 struct mbuf *top = 0; 281 register struct mbuf *m, **mp; 282 register int space; 283 int len, error = 0, s, dontroute, first = 1; 284 285 if (sosendallatonce(so) && uio->uio_resid > so->so_snd.sb_hiwat) 286 return (EMSGSIZE); 287 dontroute = 288 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 289 (so->so_proto->pr_flags & PR_ATOMIC); 290 u.u_ru.ru_msgsnd++; 291 #define snderr(errno) { error = errno; splx(s); goto release; } 292 293 restart: 294 sblock(&so->so_snd); 295 do { 296 s = splnet(); 297 if (so->so_state & SS_CANTSENDMORE) { 298 psignal(u.u_procp, SIGPIPE); 299 snderr(EPIPE); 300 } 301 if (so->so_error) { 302 error = so->so_error; 303 so->so_error = 0; /* ??? */ 304 splx(s); 305 goto release; 306 } 307 if ((so->so_state & SS_ISCONNECTED) == 0) { 308 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 309 snderr(ENOTCONN); 310 if (nam == 0) 311 snderr(EDESTADDRREQ); 312 } 313 if (flags & MSG_OOB) 314 space = 1024; 315 else { 316 space = sbspace(&so->so_snd); 317 if (space <= 0 || 318 sosendallatonce(so) && space < uio->uio_resid) { 319 if (so->so_state & SS_NBIO) { 320 if (first) 321 error = EWOULDBLOCK; 322 splx(s); 323 goto release; 324 } 325 sbunlock(&so->so_snd); 326 sbwait(&so->so_snd); 327 splx(s); 328 goto restart; 329 } 330 } 331 splx(s); 332 mp = ⊤ 333 while (uio->uio_resid > 0 && space > 0) { 334 register struct iovec *iov = uio->uio_iov; 335 336 if (iov->iov_len == 0) { 337 uio->uio_iov++; 338 uio->uio_iovcnt--; 339 if (uio->uio_iovcnt < 0) 340 panic("sosend"); 341 continue; 342 } 343 MGET(m, M_WAIT, MT_DATA); 344 if (m == NULL) { 345 error = ENOBUFS; /* SIGPIPE? */ 346 goto release; 347 } 348 if (iov->iov_len >= CLBYTES && space >= CLBYTES) { 349 register struct mbuf *p; 350 MCLGET(p, 1); 351 if (p == 0) 352 goto nopages; 353 m->m_off = (int)p - (int)m; 354 len = CLBYTES; 355 } else { 356 nopages: 357 len = MIN(MLEN, iov->iov_len); 358 } 359 error = uiomove(mtod(m, caddr_t), len, UIO_WRITE, uio); 360 m->m_len = len; 361 *mp = m; 362 if (error) 363 goto release; 364 mp = &m->m_next; 365 space -= len; 366 } 367 if (dontroute) 368 so->so_options |= SO_DONTROUTE; 369 error = (*so->so_proto->pr_usrreq)(so, 370 (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, 371 top, (caddr_t)nam, rights); 372 if (dontroute) 373 so->so_options &= ~SO_DONTROUTE; 374 top = 0; 375 first = 0; 376 if (error) 377 break; 378 } while (uio->uio_resid); 379 380 release: 381 sbunlock(&so->so_snd); 382 if (top) 383 m_freem(top); 384 return (error); 385 } 386 387 soreceive(so, aname, uio, flags, rightsp) 388 register struct socket *so; 389 struct mbuf **aname; 390 register struct uio *uio; 391 int flags; 392 struct mbuf **rightsp; 393 { 394 register struct mbuf *m, *n; 395 register int len, error = 0, s, eor, tomark; 396 struct protosw *pr = so->so_proto; 397 int moff; 398 399 if (rightsp) 400 *rightsp = 0; 401 if (aname) 402 *aname = 0; 403 if (flags & MSG_OOB) { 404 m = m_get(M_WAIT, MT_DATA); 405 if (m == 0) 406 return (ENOBUFS); 407 error = (*pr->pr_usrreq)(so, PRU_RCVOOB, 408 m, (struct mbuf *)0, (struct mbuf *)0); 409 if (error) 410 goto bad; 411 do { 412 len = uio->uio_resid; 413 if (len > m->m_len) 414 len = m->m_len; 415 error = 416 uiomove(mtod(m, caddr_t), (int)len, UIO_READ, uio); 417 m = m_free(m); 418 } while (uio->uio_resid && error == 0 && m); 419 bad: 420 if (m) 421 m_freem(m); 422 return (error); 423 } 424 425 restart: 426 sblock(&so->so_rcv); 427 s = splnet(); 428 429 #define rcverr(errno) { error = errno; splx(s); goto release; } 430 if (so->so_rcv.sb_cc == 0) { 431 if (so->so_error) { 432 error = so->so_error; 433 so->so_error = 0; 434 splx(s); 435 goto release; 436 } 437 if (so->so_state & SS_CANTRCVMORE) { 438 splx(s); 439 goto release; 440 } 441 if ((so->so_state & SS_ISCONNECTED) == 0 && 442 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 443 rcverr(ENOTCONN); 444 if (so->so_state & SS_NBIO) 445 rcverr(EWOULDBLOCK); 446 sbunlock(&so->so_rcv); 447 sbwait(&so->so_rcv); 448 splx(s); 449 goto restart; 450 } 451 u.u_ru.ru_msgrcv++; 452 m = so->so_rcv.sb_mb; 453 if (m == 0) 454 panic("receive"); 455 if (pr->pr_flags & PR_ADDR) { 456 if ((flags & MSG_PEEK) == 0) { 457 so->so_rcv.sb_cc -= m->m_len; 458 so->so_rcv.sb_mbcnt -= MSIZE; 459 } 460 if (aname) { 461 if (flags & MSG_PEEK) { 462 *aname = m_copy(m, 0, m->m_len); 463 if (*aname == NULL) 464 panic("receive 2"); 465 } else 466 *aname = m; 467 m = m->m_next; 468 (*aname)->m_next = 0; 469 } else 470 if (flags & MSG_PEEK) 471 m = m->m_next; 472 else 473 m = m_free(m); 474 if (m == 0) 475 panic("receive 2a"); 476 if (rightsp) { 477 if (m->m_len) 478 *rightsp = m_copy(m, 0, m->m_len); 479 else { 480 *rightsp = m_get(M_DONTWAIT, MT_SONAME); 481 if (*rightsp) 482 (*rightsp)->m_len = 0; 483 } 484 #ifdef notdef 485 if (*rightsp == NULL) 486 panic("receive 2b"); 487 #endif 488 } 489 if (flags & MSG_PEEK) 490 m = m->m_next; 491 else { 492 so->so_rcv.sb_cc -= m->m_len; 493 so->so_rcv.sb_mbcnt -= MSIZE; 494 m = m_free(m); 495 } 496 if (m == 0) 497 panic("receive 3"); 498 if ((flags & MSG_PEEK) == 0) 499 so->so_rcv.sb_mb = m; 500 } 501 eor = 0; 502 moff = 0; 503 tomark = so->so_oobmark; 504 do { 505 if (uio->uio_resid <= 0) 506 break; 507 len = uio->uio_resid; 508 so->so_state &= ~SS_RCVATMARK; 509 if (tomark && len > tomark) 510 len = tomark; 511 if (moff+len > m->m_len - moff) 512 len = m->m_len - moff; 513 splx(s); 514 error = 515 uiomove(mtod(m, caddr_t) + moff, (int)len, UIO_READ, uio); 516 s = splnet(); 517 if (len == m->m_len) { 518 eor = (int)m->m_act; 519 if (flags & MSG_PEEK) 520 m = m->m_next; 521 else { 522 sbfree(&so->so_rcv, m); 523 MFREE(m, n); 524 m = n; 525 so->so_rcv.sb_mb = m; 526 } 527 moff = 0; 528 } else { 529 if (flags & MSG_PEEK) 530 moff += len; 531 else { 532 m->m_off += len; 533 m->m_len -= len; 534 so->so_rcv.sb_cc -= len; 535 } 536 } 537 if ((flags & MSG_PEEK) == 0 && so->so_oobmark) { 538 so->so_oobmark -= len; 539 if (so->so_oobmark == 0) { 540 so->so_state |= SS_RCVATMARK; 541 break; 542 } 543 } 544 if (tomark) { 545 tomark -= len; 546 if (tomark == 0) 547 break; 548 } 549 } while (m && error == 0 && !eor); 550 if (flags & MSG_PEEK) 551 goto release; 552 if ((so->so_proto->pr_flags & PR_ATOMIC) && eor == 0) 553 do { 554 if (m == 0) 555 panic("receive 4"); 556 sbfree(&so->so_rcv, m); 557 eor = (int)m->m_act; 558 so->so_rcv.sb_mb = m->m_next; 559 MFREE(m, n); 560 m = n; 561 } while (eor == 0); 562 if ((so->so_proto->pr_flags & PR_WANTRCVD) && so->so_pcb) 563 (*so->so_proto->pr_usrreq)(so, PRU_RCVD, 564 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 565 release: 566 sbunlock(&so->so_rcv); 567 if (error == 0 && rightsp && 568 *rightsp && so->so_proto->pr_family == AF_UNIX) 569 error = unp_externalize(*rightsp); 570 splx(s); 571 return (error); 572 } 573 574 soshutdown(so, how) 575 register struct socket *so; 576 register int how; 577 { 578 register struct protosw *pr = so->so_proto; 579 580 how++; 581 if (how & FREAD) 582 sorflush(so); 583 if (how & FWRITE) 584 return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN, 585 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 586 return (0); 587 } 588 589 sorflush(so) 590 register struct socket *so; 591 { 592 register struct sockbuf *sb = &so->so_rcv; 593 register struct protosw *pr = so->so_proto; 594 register int s; 595 struct sockbuf asb; 596 597 sblock(sb); 598 s = splimp(); 599 socantrcvmore(so); 600 sbunlock(sb); 601 asb = *sb; 602 bzero((caddr_t)sb, sizeof (*sb)); 603 splx(s); 604 if (pr->pr_family == AF_UNIX && (pr->pr_flags & PR_RIGHTS)) 605 unp_scan(asb.sb_mb, unp_discard); 606 sbrelease(&asb); 607 } 608 609 sosetopt(so, level, optname, m) 610 register struct socket *so; 611 int level, optname; 612 register struct mbuf *m; 613 { 614 615 if (level != SOL_SOCKET) 616 return (EINVAL); /* XXX */ 617 switch (optname) { 618 619 case SO_DEBUG: 620 case SO_KEEPALIVE: 621 case SO_DONTROUTE: 622 case SO_USELOOPBACK: 623 case SO_REUSEADDR: 624 so->so_options |= optname; 625 break; 626 627 case SO_LINGER: 628 if (m == NULL || m->m_len != sizeof (int)) 629 return (EINVAL); 630 so->so_options |= SO_LINGER; 631 so->so_linger = *mtod(m, int *); 632 break; 633 634 case SO_DONTLINGER: 635 so->so_options &= ~SO_LINGER; 636 so->so_linger = 0; 637 break; 638 639 default: 640 return (EINVAL); 641 } 642 return (0); 643 } 644 645 sogetopt(so, level, optname, m) 646 register struct socket *so; 647 int level, optname; 648 register struct mbuf *m; 649 { 650 651 if (level != SOL_SOCKET) 652 return (EINVAL); /* XXX */ 653 switch (optname) { 654 655 case SO_USELOOPBACK: 656 case SO_DONTROUTE: 657 case SO_DEBUG: 658 case SO_KEEPALIVE: 659 case SO_LINGER: 660 case SO_REUSEADDR: 661 if ((so->so_options & optname) == 0) 662 return (ENOPROTOOPT); 663 if (optname == SO_LINGER && m != NULL) { 664 *mtod(m, int *) = so->so_linger; 665 m->m_len = sizeof (so->so_linger); 666 } 667 break; 668 669 default: 670 return (EINVAL); 671 } 672 return (0); 673 } 674 675 sohasoutofband(so) 676 register struct socket *so; 677 { 678 679 if (so->so_pgrp == 0) 680 return; 681 if (so->so_pgrp > 0) 682 gsignal(so->so_pgrp, SIGURG); 683 else { 684 struct proc *p = pfind(-so->so_pgrp); 685 686 if (p) 687 psignal(p, SIGURG); 688 } 689 } 690