1 /* 2 * Copyright (c) 1982 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)uipc_usrreq.c 6.15 (Berkeley) 06/17/85 7 */ 8 9 #include "param.h" 10 #include "dir.h" 11 #include "user.h" 12 #include "mbuf.h" 13 #include "domain.h" 14 #include "protosw.h" 15 #include "socket.h" 16 #include "socketvar.h" 17 #include "unpcb.h" 18 #include "un.h" 19 #include "inode.h" 20 #include "file.h" 21 #include "stat.h" 22 23 /* 24 * Unix communications domain. 25 * 26 * TODO: 27 * SEQPACKET, RDM 28 * rethink name space problems 29 * need a proper out-of-band 30 */ 31 struct sockaddr sun_noname = { AF_UNIX }; 32 ino_t unp_ino; /* fake inode numbers */ 33 34 /*ARGSUSED*/ 35 uipc_usrreq(so, req, m, nam, rights) 36 struct socket *so; 37 int req; 38 struct mbuf *m, *nam, *rights; 39 { 40 struct unpcb *unp = sotounpcb(so); 41 register struct socket *so2; 42 int error = 0; 43 44 if (req != PRU_SEND && rights && rights->m_len) { 45 error = EOPNOTSUPP; 46 goto release; 47 } 48 if (unp == 0 && req != PRU_ATTACH) { 49 error = EINVAL; 50 goto release; 51 } 52 switch (req) { 53 54 case PRU_ATTACH: 55 if (unp) { 56 error = EISCONN; 57 break; 58 } 59 error = unp_attach(so); 60 break; 61 62 case PRU_DETACH: 63 unp_detach(unp); 64 break; 65 66 case PRU_BIND: 67 error = unp_bind(unp, nam); 68 break; 69 70 case PRU_LISTEN: 71 if (unp->unp_inode == 0) 72 error = EINVAL; 73 break; 74 75 case PRU_CONNECT: 76 error = unp_connect(so, nam); 77 break; 78 79 case PRU_CONNECT2: 80 error = unp_connect2(so, (struct mbuf *)0, 81 (struct socket *)nam); 82 break; 83 84 case PRU_DISCONNECT: 85 unp_disconnect(unp); 86 break; 87 88 case PRU_ACCEPT: 89 nam->m_len = unp->unp_remaddr->m_len; 90 bcopy(mtod(unp->unp_remaddr, caddr_t), 91 mtod(nam, caddr_t), (unsigned)nam->m_len); 92 break; 93 94 case PRU_SHUTDOWN: 95 socantsendmore(so); 96 unp_usrclosed(unp); 97 break; 98 99 case PRU_RCVD: 100 switch (so->so_type) { 101 102 case SOCK_DGRAM: 103 panic("uipc 1"); 104 /*NOTREACHED*/ 105 106 case SOCK_STREAM: 107 #define rcv (&so->so_rcv) 108 #define snd (&so2->so_snd) 109 if (unp->unp_conn == 0) 110 break; 111 so2 = unp->unp_conn->unp_socket; 112 /* 113 * Transfer resources back to send port 114 * and wakeup any waiting to write. 115 */ 116 snd->sb_mbmax += rcv->sb_mbmax - rcv->sb_mbcnt; 117 rcv->sb_mbmax = rcv->sb_mbcnt; 118 snd->sb_hiwat += rcv->sb_hiwat - rcv->sb_cc; 119 rcv->sb_hiwat = rcv->sb_cc; 120 sowwakeup(so2); 121 #undef snd 122 #undef rcv 123 break; 124 125 default: 126 panic("uipc 2"); 127 } 128 break; 129 130 case PRU_SEND: 131 switch (so->so_type) { 132 133 case SOCK_DGRAM: 134 if (nam) { 135 if (unp->unp_conn) { 136 error = EISCONN; 137 break; 138 } 139 error = unp_connect(so, nam); 140 if (error) 141 break; 142 } else { 143 if (unp->unp_conn == 0) { 144 error = ENOTCONN; 145 break; 146 } 147 } 148 so2 = unp->unp_conn->unp_socket; 149 /* BEGIN XXX */ 150 if (rights) { 151 error = unp_internalize(rights); 152 if (error) 153 break; 154 } 155 if (sbspace(&so2->so_rcv) > 0) { 156 /* 157 * There's no record of source socket's 158 * name, so send null name for the moment. 159 */ 160 if (sbappendaddr(&so2->so_rcv, 161 &sun_noname, m, rights)) { 162 sorwakeup(so2); 163 m = 0; 164 } else 165 error = ENOBUFS; 166 } 167 /* END XXX */ 168 if (nam) 169 unp_disconnect(unp); 170 break; 171 172 case SOCK_STREAM: 173 #define rcv (&so2->so_rcv) 174 #define snd (&so->so_snd) 175 if (rights && rights->m_len) { 176 error = EOPNOTSUPP; 177 break; 178 } 179 if (so->so_state & SS_CANTSENDMORE) { 180 error = EPIPE; 181 break; 182 } 183 if (unp->unp_conn == 0) 184 panic("uipc 3"); 185 so2 = unp->unp_conn->unp_socket; 186 /* 187 * Send to paired receive port, and then 188 * give it enough resources to hold what it already has. 189 * Wake up readers. 190 */ 191 sbappend(rcv, m); 192 snd->sb_mbmax -= rcv->sb_mbcnt - rcv->sb_mbmax; 193 rcv->sb_mbmax = rcv->sb_mbcnt; 194 snd->sb_hiwat -= rcv->sb_cc - rcv->sb_hiwat; 195 rcv->sb_hiwat = rcv->sb_cc; 196 sorwakeup(so2); 197 m = 0; 198 #undef snd 199 #undef rcv 200 break; 201 202 default: 203 panic("uipc 4"); 204 } 205 break; 206 207 case PRU_ABORT: 208 unp_drop(unp, ECONNABORTED); 209 break; 210 211 /* SOME AS YET UNIMPLEMENTED HOOKS */ 212 case PRU_CONTROL: 213 return (EOPNOTSUPP); 214 215 /* END UNIMPLEMENTED HOOKS */ 216 case PRU_SENSE: 217 ((struct stat *) m)->st_blksize = so->so_snd.sb_hiwat; 218 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 219 so2 = unp->unp_conn->unp_socket; 220 ((struct stat *) m)->st_blksize += so2->so_rcv.sb_cc; 221 } 222 ((struct stat *) m)->st_dev = NODEV; 223 ((struct stat *) m)->st_ino = unp_ino++; 224 return (0); 225 226 case PRU_RCVOOB: 227 return (EOPNOTSUPP); 228 229 case PRU_SENDOOB: 230 error = EOPNOTSUPP; 231 break; 232 233 case PRU_SOCKADDR: 234 break; 235 236 case PRU_PEERADDR: 237 break; 238 239 case PRU_SLOWTIMO: 240 break; 241 242 default: 243 panic("piusrreq"); 244 } 245 release: 246 if (m) 247 m_freem(m); 248 return (error); 249 } 250 251 /* 252 * We assign all buffering for stream sockets to the source, 253 * as that is where the flow control is implemented. 254 * Datagram sockets really use the sendspace as the maximum datagram size, 255 * and don't really want to reserve the sendspace. Their recvspace should 256 * be large enough for at least one max-size datagram plus address. 257 */ 258 #define PIPSIZ 4096 259 int unpst_sendspace = PIPSIZ; 260 int unpst_recvspace = 0; 261 int unpdg_sendspace = 2*1024; /* really max datagram size */ 262 int unpdg_recvspace = 4*1024; 263 264 unp_attach(so) 265 struct socket *so; 266 { 267 register struct mbuf *m; 268 register struct unpcb *unp; 269 int error; 270 271 switch (so->so_type) { 272 273 case SOCK_STREAM: 274 error = soreserve(so, unpst_sendspace, unpst_recvspace); 275 break; 276 277 case SOCK_DGRAM: 278 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 279 break; 280 } 281 if (error) 282 return (error); 283 m = m_getclr(M_DONTWAIT, MT_PCB); 284 if (m == NULL) 285 return (ENOBUFS); 286 unp = mtod(m, struct unpcb *); 287 so->so_pcb = (caddr_t)unp; 288 unp->unp_socket = so; 289 return (0); 290 } 291 292 unp_detach(unp) 293 register struct unpcb *unp; 294 { 295 296 if (unp->unp_inode) { 297 unp->unp_inode->i_socket = 0; 298 irele(unp->unp_inode); 299 unp->unp_inode = 0; 300 } 301 if (unp->unp_conn) 302 unp_disconnect(unp); 303 while (unp->unp_refs) 304 unp_drop(unp->unp_refs, ECONNRESET); 305 soisdisconnected(unp->unp_socket); 306 unp->unp_socket->so_pcb = 0; 307 m_freem(unp->unp_remaddr); 308 (void) m_free(dtom(unp)); 309 } 310 311 unp_bind(unp, nam) 312 struct unpcb *unp; 313 struct mbuf *nam; 314 { 315 struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 316 register struct inode *ip; 317 register struct nameidata *ndp = &u.u_nd; 318 int error; 319 320 ndp->ni_dirp = soun->sun_path; 321 if (nam->m_len == MLEN) 322 return (EINVAL); 323 *(mtod(nam, caddr_t) + nam->m_len) = 0; 324 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 325 ndp->ni_nameiop = CREATE | FOLLOW; 326 ndp->ni_segflg = UIO_SYSSPACE; 327 ip = namei(ndp); 328 if (ip) { 329 iput(ip); 330 return (EADDRINUSE); 331 } 332 if (error = u.u_error) { 333 u.u_error = 0; /* XXX */ 334 return (error); 335 } 336 ip = maknode(IFSOCK | 0777, ndp); 337 if (ip == NULL) { 338 error = u.u_error; /* XXX */ 339 u.u_error = 0; /* XXX */ 340 return (error); 341 } 342 ip->i_socket = unp->unp_socket; 343 unp->unp_inode = ip; 344 iunlock(ip); /* but keep reference */ 345 return (0); 346 } 347 348 unp_connect(so, nam) 349 struct socket *so; 350 struct mbuf *nam; 351 { 352 register struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 353 register struct inode *ip; 354 int error; 355 register struct socket *so2; 356 register struct nameidata *ndp = &u.u_nd; 357 358 ndp->ni_dirp = soun->sun_path; 359 if (nam->m_len + (nam->m_off - MMINOFF) == MLEN) 360 return (EMSGSIZE); 361 *(mtod(nam, caddr_t) + nam->m_len) = 0; 362 ndp->ni_nameiop = LOOKUP | FOLLOW; 363 ndp->ni_segflg = UIO_SYSSPACE; 364 ip = namei(ndp); 365 if (ip == 0) { 366 error = u.u_error; 367 u.u_error = 0; 368 return (error); /* XXX */ 369 } 370 if (access(ip, IWRITE)) { 371 error = u.u_error; 372 u.u_error = 0; /* XXX */ 373 goto bad; 374 } 375 if ((ip->i_mode&IFMT) != IFSOCK) { 376 error = ENOTSOCK; 377 goto bad; 378 } 379 so2 = ip->i_socket; 380 if (so2 == 0) { 381 error = ECONNREFUSED; 382 goto bad; 383 } 384 if (so->so_type != so2->so_type) { 385 error = EPROTOTYPE; 386 goto bad; 387 } 388 if (so->so_proto->pr_flags & PR_CONNREQUIRED && 389 ((so2->so_options&SO_ACCEPTCONN) == 0 || 390 (so2 = sonewconn(so2)) == 0)) { 391 error = ECONNREFUSED; 392 goto bad; 393 } 394 error = unp_connect2(so, nam, so2); 395 bad: 396 iput(ip); 397 return (error); 398 } 399 400 unp_connect2(so, sonam, so2) 401 register struct socket *so; 402 struct mbuf *sonam; 403 register struct socket *so2; 404 { 405 register struct unpcb *unp = sotounpcb(so); 406 register struct unpcb *unp2; 407 408 if (so2->so_type != so->so_type) 409 return (EPROTOTYPE); 410 unp2 = sotounpcb(so2); 411 unp->unp_conn = unp2; 412 switch (so->so_type) { 413 414 case SOCK_DGRAM: 415 unp->unp_nextref = unp2->unp_refs; 416 unp2->unp_refs = unp; 417 soisconnected(so); 418 break; 419 420 case SOCK_STREAM: 421 unp2->unp_conn = unp; 422 if (sonam) 423 unp2->unp_remaddr = m_copy(sonam, 0, (int)M_COPYALL); 424 soisconnected(so2); 425 soisconnected(so); 426 break; 427 428 default: 429 panic("unp_connect2"); 430 } 431 return (0); 432 } 433 434 unp_disconnect(unp) 435 struct unpcb *unp; 436 { 437 register struct unpcb *unp2 = unp->unp_conn; 438 439 if (unp2 == 0) 440 return; 441 unp->unp_conn = 0; 442 switch (unp->unp_socket->so_type) { 443 444 case SOCK_DGRAM: 445 if (unp2->unp_refs == unp) 446 unp2->unp_refs = unp->unp_nextref; 447 else { 448 unp2 = unp2->unp_refs; 449 for (;;) { 450 if (unp2 == 0) 451 panic("unp_disconnect"); 452 if (unp2->unp_nextref == unp) 453 break; 454 unp2 = unp2->unp_nextref; 455 } 456 unp2->unp_nextref = unp->unp_nextref; 457 } 458 unp->unp_nextref = 0; 459 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 460 break; 461 462 case SOCK_STREAM: 463 soisdisconnected(unp->unp_socket); 464 unp2->unp_conn = 0; 465 soisdisconnected(unp2->unp_socket); 466 break; 467 } 468 } 469 470 #ifdef notdef 471 unp_abort(unp) 472 struct unpcb *unp; 473 { 474 475 unp_detach(unp); 476 } 477 #endif 478 479 /*ARGSUSED*/ 480 unp_usrclosed(unp) 481 struct unpcb *unp; 482 { 483 484 } 485 486 unp_drop(unp, errno) 487 struct unpcb *unp; 488 int errno; 489 { 490 struct socket *so = unp->unp_socket; 491 492 so->so_error = errno; 493 unp_disconnect(unp); 494 if (so->so_head) { 495 so->so_pcb = (caddr_t) 0; 496 m_freem(unp->unp_remaddr); 497 (void) m_free(dtom(unp)); 498 sofree(so); 499 } 500 } 501 502 #ifdef notdef 503 unp_drain() 504 { 505 506 } 507 #endif 508 509 unp_externalize(rights) 510 struct mbuf *rights; 511 { 512 int newfds = rights->m_len / sizeof (int); 513 register int i; 514 register struct file **rp = mtod(rights, struct file **); 515 register struct file *fp; 516 int f; 517 518 if (newfds > ufavail()) { 519 for (i = 0; i < newfds; i++) { 520 fp = *rp; 521 unp_discard(fp); 522 *rp++ = 0; 523 } 524 return (EMSGSIZE); 525 } 526 for (i = 0; i < newfds; i++) { 527 f = ufalloc(0); 528 if (f < 0) 529 panic("unp_externalize"); 530 fp = *rp; 531 u.u_ofile[f] = fp; 532 fp->f_msgcount--; 533 *(int *)rp++ = f; 534 } 535 return (0); 536 } 537 538 unp_internalize(rights) 539 struct mbuf *rights; 540 { 541 register struct file **rp; 542 int oldfds = rights->m_len / sizeof (int); 543 register int i; 544 register struct file *fp; 545 546 rp = mtod(rights, struct file **); 547 for (i = 0; i < oldfds; i++) 548 if (getf(*(int *)rp++) == 0) 549 return (EBADF); 550 rp = mtod(rights, struct file **); 551 for (i = 0; i < oldfds; i++) { 552 fp = getf(*(int *)rp); 553 *rp++ = fp; 554 fp->f_count++; 555 fp->f_msgcount++; 556 } 557 return (0); 558 } 559 560 int unp_defer, unp_gcing; 561 int unp_mark(); 562 extern struct domain unixdomain; 563 564 unp_gc() 565 { 566 register struct file *fp; 567 register struct socket *so; 568 569 if (unp_gcing) 570 return; 571 unp_gcing = 1; 572 restart: 573 unp_defer = 0; 574 for (fp = file; fp < fileNFILE; fp++) 575 fp->f_flag &= ~(FMARK|FDEFER); 576 do { 577 for (fp = file; fp < fileNFILE; fp++) { 578 if (fp->f_count == 0) 579 continue; 580 if (fp->f_flag & FDEFER) { 581 fp->f_flag &= ~FDEFER; 582 unp_defer--; 583 } else { 584 if (fp->f_flag & FMARK) 585 continue; 586 if (fp->f_count == fp->f_msgcount) 587 continue; 588 fp->f_flag |= FMARK; 589 } 590 if (fp->f_type != DTYPE_SOCKET) 591 continue; 592 so = (struct socket *)fp->f_data; 593 if (so->so_proto->pr_domain != &unixdomain || 594 (so->so_proto->pr_flags&PR_RIGHTS) == 0) 595 continue; 596 if (so->so_rcv.sb_flags & SB_LOCK) { 597 sbwait(&so->so_rcv); 598 goto restart; 599 } 600 unp_scan(so->so_rcv.sb_mb, unp_mark); 601 } 602 } while (unp_defer); 603 for (fp = file; fp < fileNFILE; fp++) { 604 if (fp->f_count == 0) 605 continue; 606 if (fp->f_count == fp->f_msgcount && (fp->f_flag&FMARK)==0) { 607 if (fp->f_type != DTYPE_SOCKET) 608 panic("unp_gc"); 609 (void) soshutdown((struct socket *)fp->f_data, 0); 610 } 611 } 612 unp_gcing = 0; 613 } 614 615 unp_dispose(m) 616 struct mbuf *m; 617 { 618 int unp_discard(); 619 620 if (m) 621 unp_scan(m, unp_discard); 622 } 623 624 unp_scan(m0, op) 625 register struct mbuf *m0; 626 int (*op)(); 627 { 628 register struct mbuf *m; 629 register struct file **rp; 630 register int i; 631 int qfds; 632 633 while (m0) { 634 for (m = m0; m; m = m->m_next) 635 if (m->m_type == MT_RIGHTS && m->m_len) { 636 qfds = m->m_len / sizeof (struct file *); 637 rp = mtod(m, struct file **); 638 for (i = 0; i < qfds; i++) 639 (*op)(*rp++); 640 break; /* XXX, but saves time */ 641 } 642 m0 = m0->m_act; 643 } 644 } 645 646 unp_mark(fp) 647 struct file *fp; 648 { 649 650 if (fp->f_flag & FMARK) 651 return; 652 unp_defer++; 653 fp->f_flag |= (FMARK|FDEFER); 654 } 655 656 unp_discard(fp) 657 struct file *fp; 658 { 659 660 fp->f_msgcount--; 661 closef(fp); 662 } 663