1 /* uipc_usrreq.c 6.12 85/05/27 */ 2 3 #include "param.h" 4 #include "dir.h" 5 #include "user.h" 6 #include "mbuf.h" 7 #include "domain.h" 8 #include "protosw.h" 9 #include "socket.h" 10 #include "socketvar.h" 11 #include "unpcb.h" 12 #include "un.h" 13 #include "inode.h" 14 #include "file.h" 15 #include "stat.h" 16 17 /* 18 * Unix communications domain. 19 * 20 * TODO: 21 * SEQPACKET, RDM 22 * rethink name space problems 23 * need a proper out-of-band 24 */ 25 struct sockaddr sun_noname = { AF_UNIX }; 26 ino_t unp_ino; /* fake inode numbers */ 27 28 /*ARGSUSED*/ 29 uipc_usrreq(so, req, m, nam, rights) 30 struct socket *so; 31 int req; 32 struct mbuf *m, *nam, *rights; 33 { 34 struct unpcb *unp = sotounpcb(so); 35 register struct socket *so2; 36 int error = 0; 37 38 if (req != PRU_SEND && rights && rights->m_len) { 39 error = EOPNOTSUPP; 40 goto release; 41 } 42 if (unp == 0 && req != PRU_ATTACH) { 43 error = EINVAL; 44 goto release; 45 } 46 switch (req) { 47 48 case PRU_ATTACH: 49 if (unp) { 50 error = EISCONN; 51 break; 52 } 53 error = unp_attach(so); 54 break; 55 56 case PRU_DETACH: 57 unp_detach(unp); 58 break; 59 60 case PRU_BIND: 61 error = unp_bind(unp, nam); 62 break; 63 64 case PRU_LISTEN: 65 if (unp->unp_inode == 0) 66 error = EINVAL; 67 break; 68 69 case PRU_CONNECT: 70 error = unp_connect(so, nam); 71 break; 72 73 case PRU_CONNECT2: 74 error = unp_connect2(so, (struct mbuf *)0, 75 (struct socket *)nam); 76 break; 77 78 case PRU_DISCONNECT: 79 unp_disconnect(unp); 80 break; 81 82 case PRU_ACCEPT: 83 nam->m_len = unp->unp_remaddr->m_len; 84 bcopy(mtod(unp->unp_remaddr, caddr_t), 85 mtod(nam, caddr_t), (unsigned)nam->m_len); 86 break; 87 88 case PRU_SHUTDOWN: 89 socantsendmore(so); 90 unp_usrclosed(unp); 91 break; 92 93 case PRU_RCVD: 94 switch (so->so_type) { 95 96 case SOCK_DGRAM: 97 panic("uipc 1"); 98 /*NOTREACHED*/ 99 100 case SOCK_STREAM: 101 #define rcv (&so->so_rcv) 102 #define snd (&so2->so_snd) 103 if (unp->unp_conn == 0) 104 break; 105 so2 = unp->unp_conn->unp_socket; 106 /* 107 * Transfer resources back to send port 108 * and wakeup any waiting to write. 109 */ 110 snd->sb_mbmax += rcv->sb_mbmax - rcv->sb_mbcnt; 111 rcv->sb_mbmax = rcv->sb_mbcnt; 112 snd->sb_hiwat += rcv->sb_hiwat - rcv->sb_cc; 113 rcv->sb_hiwat = rcv->sb_cc; 114 sowwakeup(so2); 115 #undef snd 116 #undef rcv 117 break; 118 119 default: 120 panic("uipc 2"); 121 } 122 break; 123 124 case PRU_SEND: 125 switch (so->so_type) { 126 127 case SOCK_DGRAM: 128 if (nam) { 129 if (unp->unp_conn) { 130 error = EISCONN; 131 break; 132 } 133 error = unp_connect(so, nam); 134 if (error) 135 break; 136 } else { 137 if (unp->unp_conn == 0) { 138 error = ENOTCONN; 139 break; 140 } 141 } 142 so2 = unp->unp_conn->unp_socket; 143 /* BEGIN XXX */ 144 if (rights) { 145 error = unp_internalize(rights); 146 if (error) 147 break; 148 } 149 if (sbspace(&so2->so_rcv) > 0) { 150 /* 151 * There's no record of source socket's 152 * name, so send null name for the moment. 153 */ 154 if (sbappendaddr(&so2->so_rcv, 155 &sun_noname, m, rights)) { 156 sorwakeup(so2); 157 m = 0; 158 } 159 } 160 /* END XXX */ 161 if (nam) 162 unp_disconnect(unp); 163 break; 164 165 case SOCK_STREAM: 166 #define rcv (&so2->so_rcv) 167 #define snd (&so->so_snd) 168 if (rights && rights->m_len) { 169 error = EOPNOTSUPP; 170 break; 171 } 172 if (so->so_state & SS_CANTSENDMORE) 173 return (EPIPE); 174 if (unp->unp_conn == 0) 175 panic("uipc 3"); 176 so2 = unp->unp_conn->unp_socket; 177 /* 178 * Send to paired receive port, and then 179 * give it enough resources to hold what it already has. 180 * Wake up readers. 181 */ 182 sbappend(rcv, m); 183 snd->sb_mbmax -= rcv->sb_mbcnt - rcv->sb_mbmax; 184 rcv->sb_mbmax = rcv->sb_mbcnt; 185 snd->sb_hiwat -= rcv->sb_cc - rcv->sb_hiwat; 186 rcv->sb_hiwat = rcv->sb_cc; 187 sorwakeup(so2); 188 m = 0; 189 #undef snd 190 #undef rcv 191 break; 192 193 default: 194 panic("uipc 4"); 195 } 196 break; 197 198 case PRU_ABORT: 199 unp_drop(unp, ECONNABORTED); 200 break; 201 202 /* SOME AS YET UNIMPLEMENTED HOOKS */ 203 case PRU_CONTROL: 204 return (EOPNOTSUPP); 205 206 /* END UNIMPLEMENTED HOOKS */ 207 case PRU_SENSE: 208 ((struct stat *) m)->st_blksize = so->so_snd.sb_hiwat; 209 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 210 so2 = unp->unp_conn->unp_socket; 211 ((struct stat *) m)->st_blksize += so2->so_rcv.sb_cc; 212 } 213 ((struct stat *) m)->st_dev = NODEV; 214 ((struct stat *) m)->st_ino = unp_ino++; 215 return (0); 216 217 case PRU_RCVOOB: 218 return (EOPNOTSUPP); 219 220 case PRU_SENDOOB: 221 error = EOPNOTSUPP; 222 break; 223 224 case PRU_SOCKADDR: 225 break; 226 227 case PRU_PEERADDR: 228 break; 229 230 case PRU_SLOWTIMO: 231 break; 232 233 default: 234 panic("piusrreq"); 235 } 236 release: 237 if (m) 238 m_freem(m); 239 return (error); 240 } 241 242 /* 243 * We assign all buffering for stream sockets to the source, 244 * as that is where the flow control is implemented. 245 * Datagram sockets really use the sendspace as the maximum datagram size, 246 * and don't really want to reserve the sendspace. Their recvspace should 247 * be large enough for at least one max-size datagram plus address. 248 */ 249 #define PIPSIZ 4096 250 int unpst_sendspace = PIPSIZ; 251 int unpst_recvspace = 0; 252 int unpdg_sendspace = 2*1024; /* really max datagram size */ 253 int unpdg_recvspace = 4*1024; 254 255 unp_attach(so) 256 struct socket *so; 257 { 258 register struct mbuf *m; 259 register struct unpcb *unp; 260 int error; 261 262 switch (so->so_type) { 263 264 case SOCK_STREAM: 265 error = soreserve(so, unpst_sendspace, unpst_recvspace); 266 break; 267 268 case SOCK_DGRAM: 269 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 270 break; 271 } 272 if (error) 273 return (error); 274 m = m_getclr(M_DONTWAIT, MT_PCB); 275 if (m == NULL) 276 return (ENOBUFS); 277 unp = mtod(m, struct unpcb *); 278 so->so_pcb = (caddr_t)unp; 279 unp->unp_socket = so; 280 return (0); 281 } 282 283 unp_detach(unp) 284 register struct unpcb *unp; 285 { 286 287 if (unp->unp_inode) { 288 unp->unp_inode->i_socket = 0; 289 irele(unp->unp_inode); 290 unp->unp_inode = 0; 291 } 292 if (unp->unp_conn) 293 unp_disconnect(unp); 294 while (unp->unp_refs) 295 unp_drop(unp->unp_refs, ECONNRESET); 296 soisdisconnected(unp->unp_socket); 297 unp->unp_socket->so_pcb = 0; 298 m_freem(unp->unp_remaddr); 299 (void) m_free(dtom(unp)); 300 } 301 302 unp_bind(unp, nam) 303 struct unpcb *unp; 304 struct mbuf *nam; 305 { 306 struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 307 register struct inode *ip; 308 register struct nameidata *ndp = &u.u_nd; 309 int error; 310 311 ndp->ni_dirp = soun->sun_path; 312 if (nam->m_len == MLEN) 313 return (EINVAL); 314 *(mtod(nam, caddr_t) + nam->m_len) = 0; 315 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 316 ndp->ni_nameiop = CREATE | FOLLOW; 317 ndp->ni_segflg = UIO_SYSSPACE; 318 ip = namei(ndp); 319 if (ip) { 320 iput(ip); 321 return (EADDRINUSE); 322 } 323 if (error = u.u_error) { 324 u.u_error = 0; /* XXX */ 325 return (error); 326 } 327 ip = maknode(IFSOCK | 0777, ndp); 328 if (ip == NULL) { 329 error = u.u_error; /* XXX */ 330 u.u_error = 0; /* XXX */ 331 return (error); 332 } 333 ip->i_socket = unp->unp_socket; 334 unp->unp_inode = ip; 335 iunlock(ip); /* but keep reference */ 336 return (0); 337 } 338 339 unp_connect(so, nam) 340 struct socket *so; 341 struct mbuf *nam; 342 { 343 register struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 344 register struct inode *ip; 345 int error; 346 register struct socket *so2; 347 register struct nameidata *ndp = &u.u_nd; 348 349 ndp->ni_dirp = soun->sun_path; 350 if (nam->m_len + (nam->m_off - MMINOFF) == MLEN) 351 return (EMSGSIZE); 352 *(mtod(nam, caddr_t) + nam->m_len) = 0; 353 ndp->ni_nameiop = LOOKUP | FOLLOW; 354 ndp->ni_segflg = UIO_SYSSPACE; 355 ip = namei(ndp); 356 if (ip == 0) { 357 error = u.u_error; 358 u.u_error = 0; 359 return (error); /* XXX */ 360 } 361 if (access(ip, IWRITE)) { 362 error = u.u_error; 363 u.u_error = 0; /* XXX */ 364 goto bad; 365 } 366 if ((ip->i_mode&IFMT) != IFSOCK) { 367 error = ENOTSOCK; 368 goto bad; 369 } 370 so2 = ip->i_socket; 371 if (so2 == 0) { 372 error = ECONNREFUSED; 373 goto bad; 374 } 375 if (so->so_type != so2->so_type) { 376 error = EPROTOTYPE; 377 goto bad; 378 } 379 if (so->so_proto->pr_flags & PR_CONNREQUIRED && 380 ((so2->so_options&SO_ACCEPTCONN) == 0 || 381 (so2 = sonewconn(so2)) == 0)) { 382 error = ECONNREFUSED; 383 goto bad; 384 } 385 error = unp_connect2(so, nam, so2); 386 bad: 387 iput(ip); 388 return (error); 389 } 390 391 unp_connect2(so, sonam, so2) 392 register struct socket *so; 393 struct mbuf *sonam; 394 register struct socket *so2; 395 { 396 register struct unpcb *unp = sotounpcb(so); 397 register struct unpcb *unp2; 398 399 if (so2->so_type != so->so_type) 400 return (EPROTOTYPE); 401 unp2 = sotounpcb(so2); 402 unp->unp_conn = unp2; 403 switch (so->so_type) { 404 405 case SOCK_DGRAM: 406 unp->unp_nextref = unp2->unp_refs; 407 unp2->unp_refs = unp; 408 soisconnected(so); 409 break; 410 411 case SOCK_STREAM: 412 unp2->unp_conn = unp; 413 if (sonam) 414 unp2->unp_remaddr = m_copy(sonam, 0, (int)M_COPYALL); 415 soisconnected(so2); 416 soisconnected(so); 417 break; 418 419 default: 420 panic("unp_connect2"); 421 } 422 return (0); 423 } 424 425 unp_disconnect(unp) 426 struct unpcb *unp; 427 { 428 register struct unpcb *unp2 = unp->unp_conn; 429 430 if (unp2 == 0) 431 return; 432 unp->unp_conn = 0; 433 switch (unp->unp_socket->so_type) { 434 435 case SOCK_DGRAM: 436 if (unp2->unp_refs == unp) 437 unp2->unp_refs = unp->unp_nextref; 438 else { 439 unp2 = unp2->unp_refs; 440 for (;;) { 441 if (unp2 == 0) 442 panic("unp_disconnect"); 443 if (unp2->unp_nextref == unp) 444 break; 445 unp2 = unp2->unp_nextref; 446 } 447 unp2->unp_nextref = unp->unp_nextref; 448 } 449 unp->unp_nextref = 0; 450 break; 451 452 case SOCK_STREAM: 453 soisdisconnected(unp->unp_socket); 454 unp2->unp_conn = 0; 455 soisdisconnected(unp2->unp_socket); 456 break; 457 } 458 } 459 460 #ifdef notdef 461 unp_abort(unp) 462 struct unpcb *unp; 463 { 464 465 unp_detach(unp); 466 } 467 #endif 468 469 /*ARGSUSED*/ 470 unp_usrclosed(unp) 471 struct unpcb *unp; 472 { 473 474 } 475 476 unp_drop(unp, errno) 477 struct unpcb *unp; 478 int errno; 479 { 480 struct socket *so = unp->unp_socket; 481 482 so->so_error = errno; 483 unp_disconnect(unp); 484 if (so->so_head) { 485 so->so_pcb = (caddr_t) 0; 486 m_freem(unp->unp_remaddr); 487 (void) m_free(dtom(unp)); 488 sofree(so); 489 } 490 } 491 492 #ifdef notdef 493 unp_drain() 494 { 495 496 } 497 #endif 498 499 unp_externalize(rights) 500 struct mbuf *rights; 501 { 502 int newfds = rights->m_len / sizeof (int); 503 register int i; 504 register struct file **rp = mtod(rights, struct file **); 505 register struct file *fp; 506 int f; 507 508 if (newfds > ufavail()) { 509 for (i = 0; i < newfds; i++) { 510 fp = *rp; 511 unp_discard(fp); 512 *rp++ = 0; 513 } 514 return (EMSGSIZE); 515 } 516 for (i = 0; i < newfds; i++) { 517 f = ufalloc(0); 518 if (f < 0) 519 panic("unp_externalize"); 520 fp = *rp; 521 u.u_ofile[f] = fp; 522 fp->f_msgcount--; 523 *(int *)rp++ = f; 524 } 525 return (0); 526 } 527 528 unp_internalize(rights) 529 struct mbuf *rights; 530 { 531 register struct file **rp; 532 int oldfds = rights->m_len / sizeof (int); 533 register int i; 534 register struct file *fp; 535 536 rp = mtod(rights, struct file **); 537 for (i = 0; i < oldfds; i++) 538 if (getf(*(int *)rp++) == 0) 539 return (EBADF); 540 rp = mtod(rights, struct file **); 541 for (i = 0; i < oldfds; i++) { 542 fp = getf(*(int *)rp); 543 *rp++ = fp; 544 fp->f_count++; 545 fp->f_msgcount++; 546 } 547 return (0); 548 } 549 550 int unp_defer, unp_gcing; 551 int unp_mark(); 552 extern struct domain unixdomain; 553 554 unp_gc() 555 { 556 register struct file *fp; 557 register struct socket *so; 558 559 if (unp_gcing) 560 return; 561 unp_gcing = 1; 562 restart: 563 unp_defer = 0; 564 for (fp = file; fp < fileNFILE; fp++) 565 fp->f_flag &= ~(FMARK|FDEFER); 566 do { 567 for (fp = file; fp < fileNFILE; fp++) { 568 if (fp->f_count == 0) 569 continue; 570 if (fp->f_flag & FDEFER) { 571 fp->f_flag &= ~FDEFER; 572 unp_defer--; 573 } else { 574 if (fp->f_flag & FMARK) 575 continue; 576 if (fp->f_count == fp->f_msgcount) 577 continue; 578 fp->f_flag |= FMARK; 579 } 580 if (fp->f_type != DTYPE_SOCKET) 581 continue; 582 so = (struct socket *)fp->f_data; 583 if (so->so_proto->pr_domain != &unixdomain || 584 (so->so_proto->pr_flags&PR_ADDR) == 0) 585 continue; 586 if (so->so_rcv.sb_flags & SB_LOCK) { 587 sbwait(&so->so_rcv); 588 goto restart; 589 } 590 unp_scan(so->so_rcv.sb_mb, unp_mark); 591 } 592 } while (unp_defer); 593 for (fp = file; fp < fileNFILE; fp++) { 594 if (fp->f_count == 0) 595 continue; 596 if (fp->f_count == fp->f_msgcount && (fp->f_flag&FMARK)==0) { 597 if (fp->f_type != DTYPE_SOCKET) 598 panic("unp_gc"); 599 (void) soshutdown((struct socket *)fp->f_data, 0); 600 } 601 } 602 unp_gcing = 0; 603 } 604 605 unp_dispose(m) 606 struct mbuf *m; 607 { 608 int unp_discard(); 609 610 if (m) 611 unp_scan(m, unp_discard); 612 } 613 614 unp_scan(m0, op) 615 register struct mbuf *m0; 616 int (*op)(); 617 { 618 register struct mbuf *m; 619 register struct file **rp; 620 register int i; 621 int qfds; 622 623 while (m0) { 624 for (m = m0; m; m = m->m_next) 625 if (m->m_type == MT_RIGHTS && m->m_len) { 626 qfds = m->m_len / sizeof (struct file *); 627 rp = mtod(m, struct file **); 628 for (i = 0; i < qfds; i++) 629 (*op)(*rp++); 630 break; /* XXX, but saves time */ 631 } 632 m0 = m0->m_act; 633 } 634 } 635 636 unp_mark(fp) 637 struct file *fp; 638 { 639 640 if (fp->f_flag & FMARK) 641 return; 642 unp_defer++; 643 fp->f_flag |= (FMARK|FDEFER); 644 } 645 646 unp_discard(fp) 647 struct file *fp; 648 { 649 650 fp->f_msgcount--; 651 closef(fp); 652 } 653