1 /* uipc_socket.c 4.76 83/06/14 */ 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 */ 272 sosend(so, nam, uio, flags, rights) 273 register struct socket *so; 274 struct mbuf *nam; 275 register struct uio *uio; 276 int flags; 277 struct mbuf *rights; 278 { 279 struct mbuf *top = 0; 280 register struct mbuf *m, **mp = ⊤ 281 register int space; 282 int len, error = 0, s, dontroute; 283 284 if (sosendallatonce(so) && uio->uio_resid > so->so_snd.sb_hiwat) 285 return (EMSGSIZE); 286 dontroute = 287 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 288 (so->so_proto->pr_flags & PR_ATOMIC); 289 restart: 290 sblock(&so->so_snd); 291 #define snderr(errno) { error = errno; splx(s); goto release; } 292 293 u.u_ru.ru_msgsnd++; 294 again: 295 s = splnet(); 296 if (so->so_state & SS_CANTSENDMORE) { 297 psignal(u.u_procp, SIGPIPE); 298 snderr(EPIPE); 299 } 300 if (so->so_error) { 301 error = so->so_error; 302 so->so_error = 0; /* ??? */ 303 splx(s); 304 goto release; 305 } 306 if ((so->so_state & SS_ISCONNECTED) == 0) { 307 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 308 snderr(ENOTCONN); 309 if (nam == 0) 310 snderr(EDESTADDRREQ); 311 } 312 if (top) { 313 if (dontroute) 314 so->so_options |= SO_DONTROUTE; 315 error = (*so->so_proto->pr_usrreq)(so, 316 (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, 317 top, (caddr_t)nam, rights); 318 if (dontroute) 319 so->so_options &= ~SO_DONTROUTE; 320 top = 0; 321 if (error) { 322 splx(s); 323 goto release; 324 } 325 mp = ⊤ 326 } 327 if (uio->uio_resid == 0) { 328 splx(s); 329 goto release; 330 } 331 if (flags & MSG_OOB) 332 space = 1024; 333 else { 334 space = sbspace(&so->so_snd); 335 if (space <= 0 || 336 sosendallatonce(so) && space < uio->uio_resid) { 337 if (so->so_state & SS_NBIO) 338 snderr(EWOULDBLOCK); 339 sbunlock(&so->so_snd); 340 sbwait(&so->so_snd); 341 splx(s); 342 goto restart; 343 } 344 } 345 splx(s); 346 while (uio->uio_resid > 0 && space > 0) { 347 register struct iovec *iov = uio->uio_iov; 348 349 if (iov->iov_len == 0) { 350 uio->uio_iov++; 351 uio->uio_iovcnt--; 352 if (uio->uio_iovcnt < 0) 353 panic("sosend"); 354 continue; 355 } 356 MGET(m, M_WAIT, MT_DATA); 357 if (m == NULL) { 358 error = ENOBUFS; /* SIGPIPE? */ 359 goto release; 360 } 361 if (iov->iov_len >= CLBYTES && space >= CLBYTES) { 362 register struct mbuf *p; 363 MCLGET(p, 1); 364 if (p == 0) 365 goto nopages; 366 m->m_off = (int)p - (int)m; 367 len = CLBYTES; 368 } else { 369 nopages: 370 len = MIN(MLEN, iov->iov_len); 371 } 372 (void) uiomove(mtod(m, caddr_t), len, UIO_WRITE, uio); 373 m->m_len = len; 374 *mp = m; 375 mp = &m->m_next; 376 if (flags & MSG_OOB) 377 space -= len; 378 else 379 space = sbspace(&so->so_snd); 380 } 381 goto again; 382 383 release: 384 sbunlock(&so->so_snd); 385 if (top) 386 m_freem(top); 387 return (error); 388 } 389 390 soreceive(so, aname, uio, flags, rightsp) 391 register struct socket *so; 392 struct mbuf **aname; 393 register struct uio *uio; 394 int flags; 395 struct mbuf **rightsp; 396 { 397 register struct mbuf *m, *n; 398 register int len, error = 0, s, eor, tomark; 399 struct protosw *pr = so->so_proto; 400 int moff; 401 402 if (rightsp) 403 *rightsp = 0; 404 if (aname) 405 *aname = 0; 406 if (flags & MSG_OOB) { 407 m = m_get(M_WAIT, MT_DATA); 408 if (m == 0) 409 return (ENOBUFS); 410 error = (*pr->pr_usrreq)(so, PRU_RCVOOB, 411 m, (struct mbuf *)0, (struct mbuf *)0); 412 if (error) 413 goto bad; 414 do { 415 len = uio->uio_resid; 416 if (len > m->m_len) 417 len = m->m_len; 418 error = 419 uiomove(mtod(m, caddr_t), (int)len, UIO_READ, uio); 420 m = m_free(m); 421 } while (uio->uio_resid && error == 0 && m); 422 bad: 423 if (m) 424 m_freem(m); 425 return (error); 426 } 427 428 restart: 429 sblock(&so->so_rcv); 430 s = splnet(); 431 432 #define rcverr(errno) { error = errno; splx(s); goto release; } 433 if (so->so_rcv.sb_cc == 0) { 434 if (so->so_error) { 435 error = so->so_error; 436 so->so_error = 0; 437 splx(s); 438 goto release; 439 } 440 if (so->so_state & SS_CANTRCVMORE) { 441 splx(s); 442 goto release; 443 } 444 if ((so->so_state & SS_ISCONNECTED) == 0 && 445 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 446 rcverr(ENOTCONN); 447 if (so->so_state & SS_NBIO) 448 rcverr(EWOULDBLOCK); 449 sbunlock(&so->so_rcv); 450 sbwait(&so->so_rcv); 451 splx(s); 452 goto restart; 453 } 454 u.u_ru.ru_msgrcv++; 455 m = so->so_rcv.sb_mb; 456 if (m == 0) 457 panic("receive"); 458 if (pr->pr_flags & PR_ADDR) { 459 if ((flags & MSG_PEEK) == 0) { 460 so->so_rcv.sb_cc -= m->m_len; 461 so->so_rcv.sb_mbcnt -= MSIZE; 462 } 463 if (aname) { 464 if (flags & MSG_PEEK) { 465 *aname = m_copy(m, 0, m->m_len); 466 if (*aname == NULL) 467 panic("receive 2"); 468 } else 469 *aname = m; 470 m = m->m_next; 471 (*aname)->m_next = 0; 472 } else 473 if (flags & MSG_PEEK) 474 m = m->m_next; 475 else 476 m = m_free(m); 477 if (m == 0) 478 panic("receive 2a"); 479 if (rightsp) { 480 if (m->m_len) 481 *rightsp = m_copy(m, 0, m->m_len); 482 else { 483 *rightsp = m_get(M_DONTWAIT, MT_SONAME); 484 if (*rightsp) 485 (*rightsp)->m_len = 0; 486 } 487 if (*rightsp == NULL) 488 panic("receive 2b"); 489 } 490 if (flags & MSG_PEEK) 491 m = m->m_next; 492 else { 493 so->so_rcv.sb_cc -= m->m_len; 494 so->so_rcv.sb_mbcnt -= MSIZE; 495 m = m_free(m); 496 } 497 if (m == 0) 498 panic("receive 3"); 499 if ((flags & MSG_PEEK) == 0) 500 so->so_rcv.sb_mb = m; 501 } 502 eor = 0; 503 moff = 0; 504 tomark = so->so_oobmark; 505 do { 506 if (uio->uio_resid <= 0) 507 break; 508 len = uio->uio_resid; 509 so->so_state &= ~SS_RCVATMARK; 510 if (tomark && len > tomark) 511 len = tomark; 512 if (moff+len > m->m_len - moff) 513 len = m->m_len - moff; 514 splx(s); 515 error = 516 uiomove(mtod(m, caddr_t) + moff, (int)len, UIO_READ, uio); 517 s = splnet(); 518 if (len == m->m_len) { 519 eor = (int)m->m_act; 520 if (flags & MSG_PEEK) 521 m = m->m_next; 522 else { 523 sbfree(&so->so_rcv, m); 524 MFREE(m, n); 525 m = n; 526 so->so_rcv.sb_mb = m; 527 } 528 moff = 0; 529 } else { 530 if (flags & MSG_PEEK) 531 moff += len; 532 else { 533 m->m_off += len; 534 m->m_len -= len; 535 so->so_rcv.sb_cc -= len; 536 } 537 } 538 if ((flags & MSG_PEEK) == 0 && so->so_oobmark) { 539 so->so_oobmark -= len; 540 if (so->so_oobmark == 0) { 541 so->so_state |= SS_RCVATMARK; 542 break; 543 } 544 } 545 if (tomark) { 546 tomark -= len; 547 if (tomark == 0) 548 break; 549 } 550 } while (m && error == 0 && !eor); 551 if (flags & MSG_PEEK) 552 goto release; 553 if ((so->so_proto->pr_flags & PR_ATOMIC) && eor == 0) 554 do { 555 if (m == 0) 556 panic("receive 4"); 557 sbfree(&so->so_rcv, m); 558 eor = (int)m->m_act; 559 so->so_rcv.sb_mb = m->m_next; 560 MFREE(m, n); 561 m = n; 562 } while (eor == 0); 563 if ((so->so_proto->pr_flags & PR_WANTRCVD) && so->so_pcb) 564 (*so->so_proto->pr_usrreq)(so, PRU_RCVD, 565 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 566 release: 567 sbunlock(&so->so_rcv); 568 if (error == 0 && rightsp && 569 *rightsp && so->so_proto->pr_family == AF_UNIX) 570 error = unp_externalize(*rightsp); 571 splx(s); 572 return (error); 573 } 574 575 soshutdown(so, how) 576 register struct socket *so; 577 register int how; 578 { 579 register struct protosw *pr = so->so_proto; 580 581 how++; 582 if (how & FREAD) 583 sorflush(so); 584 if (how & FWRITE) 585 return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN, 586 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 587 return (0); 588 } 589 590 sorflush(so) 591 register struct socket *so; 592 { 593 register struct sockbuf *sb = &so->so_rcv; 594 register struct protosw *pr = so->so_proto; 595 register int s; 596 struct sockbuf asb; 597 598 sblock(sb); 599 s = splimp(); 600 socantrcvmore(so); 601 sbunlock(sb); 602 asb = *sb; 603 bzero((caddr_t)sb, sizeof (*sb)); 604 splx(s); 605 if (pr->pr_family == AF_UNIX && (pr->pr_flags & PR_RIGHTS)) 606 unp_scan(asb.sb_mb, unp_discard); 607 sbrelease(&asb); 608 } 609 610 sosetopt(so, level, optname, m) 611 register struct socket *so; 612 int level, optname; 613 register struct mbuf *m; 614 { 615 616 if (level != SOL_SOCKET) 617 return (EINVAL); /* XXX */ 618 switch (optname) { 619 620 case SO_DEBUG: 621 case SO_KEEPALIVE: 622 case SO_DONTROUTE: 623 case SO_USELOOPBACK: 624 case SO_REUSEADDR: 625 so->so_options |= optname; 626 break; 627 628 case SO_LINGER: 629 if (m == NULL || m->m_len != sizeof (int)) 630 return (EINVAL); 631 so->so_options |= SO_LINGER; 632 so->so_linger = *mtod(m, int *); 633 break; 634 635 case SO_DONTLINGER: 636 so->so_options &= ~SO_LINGER; 637 so->so_linger = 0; 638 break; 639 640 default: 641 return (EINVAL); 642 } 643 return (0); 644 } 645 646 sogetopt(so, level, optname, m) 647 register struct socket *so; 648 int level, optname; 649 register struct mbuf *m; 650 { 651 652 if (level != SOL_SOCKET) 653 return (EINVAL); /* XXX */ 654 switch (optname) { 655 656 case SO_USELOOPBACK: 657 case SO_DONTROUTE: 658 case SO_DEBUG: 659 case SO_KEEPALIVE: 660 case SO_LINGER: 661 case SO_REUSEADDR: 662 if ((so->so_options & optname) == 0) 663 return (ENOPROTOOPT); 664 if (optname == SO_LINGER && m != NULL) { 665 *mtod(m, int *) = so->so_linger; 666 m->m_len = sizeof (so->so_linger); 667 } 668 break; 669 670 default: 671 return (EINVAL); 672 } 673 return (0); 674 } 675 676 sohasoutofband(so) 677 register struct socket *so; 678 { 679 680 if (so->so_pgrp == 0) 681 return; 682 if (so->so_pgrp > 0) 683 gsignal(so->so_pgrp, SIGURG); 684 else { 685 struct proc *p = pfind(-so->so_pgrp); 686 687 if (p) 688 psignal(p, SIGURG); 689 } 690 } 691