1 /* uipc_socket.c 6.5 84/08/21 */ 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 (uio->uio_resid >= CLBYTES && space < CLBYTES && 320 so->so_snd.sb_cc >= CLBYTES && 321 (so->so_state & SS_NBIO) == 0)) { 322 if (so->so_state & SS_NBIO) { 323 if (first) 324 error = EWOULDBLOCK; 325 splx(s); 326 goto release; 327 } 328 sbunlock(&so->so_snd); 329 sbwait(&so->so_snd); 330 splx(s); 331 goto restart; 332 } 333 } 334 splx(s); 335 mp = ⊤ 336 while (uio->uio_resid > 0 && space > 0) { 337 register struct iovec *iov = uio->uio_iov; 338 339 if (iov->iov_len == 0) { 340 uio->uio_iov++; 341 uio->uio_iovcnt--; 342 if (uio->uio_iovcnt < 0) 343 panic("sosend"); 344 continue; 345 } 346 MGET(m, M_WAIT, MT_DATA); 347 if (m == NULL) { 348 error = ENOBUFS; /* SIGPIPE? */ 349 goto release; 350 } 351 if (iov->iov_len >= CLBYTES && space >= CLBYTES) { 352 register struct mbuf *p; 353 MCLGET(p, 1); 354 if (p == 0) 355 goto nopages; 356 m->m_off = (int)p - (int)m; 357 len = CLBYTES; 358 } else { 359 nopages: 360 len = MIN(MLEN, iov->iov_len); 361 } 362 error = uiomove(mtod(m, caddr_t), len, UIO_WRITE, uio); 363 m->m_len = len; 364 *mp = m; 365 if (error) 366 goto release; 367 mp = &m->m_next; 368 space -= len; 369 } 370 if (top) { 371 if (dontroute) 372 so->so_options |= SO_DONTROUTE; 373 s = splnet(); 374 error = (*so->so_proto->pr_usrreq)(so, 375 (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, 376 top, (caddr_t)nam, rights); 377 splx(s); 378 if (dontroute) 379 so->so_options &= ~SO_DONTROUTE; 380 } 381 top = 0; 382 first = 0; 383 if (error) 384 break; 385 } while (uio->uio_resid); 386 387 release: 388 sbunlock(&so->so_snd); 389 if (top) 390 m_freem(top); 391 return (error); 392 } 393 394 soreceive(so, aname, uio, flags, rightsp) 395 register struct socket *so; 396 struct mbuf **aname; 397 register struct uio *uio; 398 int flags; 399 struct mbuf **rightsp; 400 { 401 register struct mbuf *m, *n; 402 register int len, error = 0, s, eor, tomark; 403 struct protosw *pr = so->so_proto; 404 int moff; 405 406 if (rightsp) 407 *rightsp = 0; 408 if (aname) 409 *aname = 0; 410 if (flags & MSG_OOB) { 411 m = m_get(M_WAIT, MT_DATA); 412 if (m == 0) 413 return (ENOBUFS); 414 error = (*pr->pr_usrreq)(so, PRU_RCVOOB, 415 m, (struct mbuf *)0, (struct mbuf *)0); 416 if (error) 417 goto bad; 418 do { 419 len = uio->uio_resid; 420 if (len > m->m_len) 421 len = m->m_len; 422 error = 423 uiomove(mtod(m, caddr_t), (int)len, UIO_READ, uio); 424 m = m_free(m); 425 } while (uio->uio_resid && error == 0 && m); 426 bad: 427 if (m) 428 m_freem(m); 429 return (error); 430 } 431 432 restart: 433 sblock(&so->so_rcv); 434 s = splnet(); 435 436 #define rcverr(errno) { error = errno; splx(s); goto release; } 437 if (so->so_rcv.sb_cc == 0) { 438 if (so->so_error) { 439 error = so->so_error; 440 so->so_error = 0; 441 splx(s); 442 goto release; 443 } 444 if (so->so_state & SS_CANTRCVMORE) { 445 splx(s); 446 goto release; 447 } 448 if ((so->so_state & SS_ISCONNECTED) == 0 && 449 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 450 rcverr(ENOTCONN); 451 if (so->so_state & SS_NBIO) 452 rcverr(EWOULDBLOCK); 453 sbunlock(&so->so_rcv); 454 sbwait(&so->so_rcv); 455 splx(s); 456 goto restart; 457 } 458 u.u_ru.ru_msgrcv++; 459 m = so->so_rcv.sb_mb; 460 if (m == 0) 461 panic("receive"); 462 if (pr->pr_flags & PR_ADDR) { 463 if ((flags & MSG_PEEK) == 0) { 464 so->so_rcv.sb_cc -= m->m_len; 465 so->so_rcv.sb_mbcnt -= MSIZE; 466 } 467 if (aname) { 468 if (flags & MSG_PEEK) { 469 *aname = m_copy(m, 0, m->m_len); 470 if (*aname == NULL) 471 panic("receive 2"); 472 } else 473 *aname = m; 474 m = m->m_next; 475 (*aname)->m_next = 0; 476 } else 477 if (flags & MSG_PEEK) 478 m = m->m_next; 479 else 480 m = m_free(m); 481 if (m == 0) 482 panic("receive 2a"); 483 if (rightsp) { 484 if (m->m_len) 485 *rightsp = m_copy(m, 0, m->m_len); 486 else { 487 *rightsp = m_get(M_DONTWAIT, MT_SONAME); 488 if (*rightsp) 489 (*rightsp)->m_len = 0; 490 } 491 #ifdef notdef 492 if (*rightsp == NULL) 493 panic("receive 2b"); 494 #endif 495 } 496 if (flags & MSG_PEEK) 497 m = m->m_next; 498 else { 499 so->so_rcv.sb_cc -= m->m_len; 500 so->so_rcv.sb_mbcnt -= MSIZE; 501 m = m_free(m); 502 } 503 if (m == 0) 504 panic("receive 3"); 505 if ((flags & MSG_PEEK) == 0) 506 so->so_rcv.sb_mb = m; 507 } 508 eor = 0; 509 moff = 0; 510 tomark = so->so_oobmark; 511 do { 512 if (uio->uio_resid <= 0) 513 break; 514 len = uio->uio_resid; 515 so->so_state &= ~SS_RCVATMARK; 516 if (tomark && len > tomark) 517 len = tomark; 518 if (moff+len > m->m_len - moff) 519 len = m->m_len - moff; 520 splx(s); 521 error = 522 uiomove(mtod(m, caddr_t) + moff, (int)len, UIO_READ, uio); 523 s = splnet(); 524 if (len == m->m_len) { 525 eor = (int)m->m_act; 526 if (flags & MSG_PEEK) 527 m = m->m_next; 528 else { 529 sbfree(&so->so_rcv, m); 530 MFREE(m, n); 531 m = n; 532 so->so_rcv.sb_mb = m; 533 } 534 moff = 0; 535 } else { 536 if (flags & MSG_PEEK) 537 moff += len; 538 else { 539 m->m_off += len; 540 m->m_len -= len; 541 so->so_rcv.sb_cc -= len; 542 } 543 } 544 if ((flags & MSG_PEEK) == 0 && so->so_oobmark) { 545 so->so_oobmark -= len; 546 if (so->so_oobmark == 0) { 547 so->so_state |= SS_RCVATMARK; 548 break; 549 } 550 } 551 if (tomark) { 552 tomark -= len; 553 if (tomark == 0) 554 break; 555 } 556 } while (m && error == 0 && !eor); 557 if (flags & MSG_PEEK) 558 goto release; 559 if ((so->so_proto->pr_flags & PR_ATOMIC) && eor == 0) 560 do { 561 if (m == 0) 562 panic("receive 4"); 563 sbfree(&so->so_rcv, m); 564 eor = (int)m->m_act; 565 so->so_rcv.sb_mb = m->m_next; 566 MFREE(m, n); 567 m = n; 568 } while (eor == 0); 569 if ((so->so_proto->pr_flags & PR_WANTRCVD) && so->so_pcb) 570 (*so->so_proto->pr_usrreq)(so, PRU_RCVD, 571 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 572 release: 573 sbunlock(&so->so_rcv); 574 if (error == 0 && rightsp && 575 *rightsp && so->so_proto->pr_family == AF_UNIX) 576 error = unp_externalize(*rightsp); 577 splx(s); 578 return (error); 579 } 580 581 soshutdown(so, how) 582 register struct socket *so; 583 register int how; 584 { 585 register struct protosw *pr = so->so_proto; 586 587 how++; 588 if (how & FREAD) 589 sorflush(so); 590 if (how & FWRITE) 591 return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN, 592 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 593 return (0); 594 } 595 596 sorflush(so) 597 register struct socket *so; 598 { 599 register struct sockbuf *sb = &so->so_rcv; 600 register struct protosw *pr = so->so_proto; 601 register int s; 602 struct sockbuf asb; 603 604 sblock(sb); 605 s = splimp(); 606 socantrcvmore(so); 607 sbunlock(sb); 608 asb = *sb; 609 bzero((caddr_t)sb, sizeof (*sb)); 610 splx(s); 611 if (pr->pr_family == AF_UNIX && (pr->pr_flags & PR_RIGHTS)) 612 unp_scan(asb.sb_mb, unp_discard); 613 sbrelease(&asb); 614 } 615 616 sosetopt(so, level, optname, m) 617 register struct socket *so; 618 int level, optname; 619 register struct mbuf *m; 620 { 621 622 if (level != SOL_SOCKET) 623 return (EINVAL); /* XXX */ 624 switch (optname) { 625 626 case SO_DEBUG: 627 case SO_KEEPALIVE: 628 case SO_DONTROUTE: 629 case SO_USELOOPBACK: 630 case SO_REUSEADDR: 631 so->so_options |= optname; 632 break; 633 634 case SO_LINGER: 635 if (m == NULL || m->m_len != sizeof (int)) 636 return (EINVAL); 637 so->so_options |= SO_LINGER; 638 so->so_linger = *mtod(m, int *); 639 break; 640 641 case SO_DONTLINGER: 642 so->so_options &= ~SO_LINGER; 643 so->so_linger = 0; 644 break; 645 646 default: 647 return (EINVAL); 648 } 649 return (0); 650 } 651 652 sogetopt(so, level, optname, m) 653 register struct socket *so; 654 int level, optname; 655 register struct mbuf *m; 656 { 657 658 if (level != SOL_SOCKET) 659 return (EINVAL); /* XXX */ 660 switch (optname) { 661 662 case SO_USELOOPBACK: 663 case SO_DONTROUTE: 664 case SO_DEBUG: 665 case SO_KEEPALIVE: 666 case SO_LINGER: 667 case SO_REUSEADDR: 668 if ((so->so_options & optname) == 0) 669 return (ENOPROTOOPT); 670 if (optname == SO_LINGER && m != NULL) { 671 *mtod(m, int *) = so->so_linger; 672 m->m_len = sizeof (so->so_linger); 673 } 674 break; 675 676 default: 677 return (EINVAL); 678 } 679 return (0); 680 } 681 682 sohasoutofband(so) 683 register struct socket *so; 684 { 685 686 if (so->so_pgrp == 0) 687 return; 688 if (so->so_pgrp > 0) 689 gsignal(so->so_pgrp, SIGURG); 690 else { 691 struct proc *p = pfind(-so->so_pgrp); 692 693 if (p) 694 psignal(p, SIGURG); 695 } 696 } 697