1 /* uipc_usrreq.c 6.11 84/12/20 */ 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 27 /*ARGSUSED*/ 28 uipc_usrreq(so, req, m, nam, rights) 29 struct socket *so; 30 int req; 31 struct mbuf *m, *nam, *rights; 32 { 33 struct unpcb *unp = sotounpcb(so); 34 register struct socket *so2; 35 int error = 0; 36 37 if (req != PRU_SEND && rights && rights->m_len) { 38 error = EOPNOTSUPP; 39 goto release; 40 } 41 if (unp == 0 && req != PRU_ATTACH) { 42 error = EINVAL; 43 goto release; 44 } 45 switch (req) { 46 47 case PRU_ATTACH: 48 if (unp) { 49 error = EISCONN; 50 break; 51 } 52 error = unp_attach(so); 53 break; 54 55 case PRU_DETACH: 56 unp_detach(unp); 57 break; 58 59 case PRU_BIND: 60 error = unp_bind(unp, nam); 61 break; 62 63 case PRU_LISTEN: 64 if (unp->unp_inode == 0) 65 error = EINVAL; 66 break; 67 68 case PRU_CONNECT: 69 error = unp_connect(so, nam); 70 break; 71 72 case PRU_CONNECT2: 73 error = unp_connect2(so, (struct mbuf *)0, 74 (struct socket *)nam); 75 break; 76 77 case PRU_DISCONNECT: 78 unp_disconnect(unp); 79 break; 80 81 case PRU_ACCEPT: 82 nam->m_len = unp->unp_remaddr->m_len; 83 bcopy(mtod(unp->unp_remaddr, caddr_t), 84 mtod(nam, caddr_t), (unsigned)nam->m_len); 85 break; 86 87 case PRU_SHUTDOWN: 88 socantsendmore(so); 89 unp_usrclosed(unp); 90 break; 91 92 case PRU_RCVD: 93 switch (so->so_type) { 94 95 case SOCK_DGRAM: 96 panic("uipc 1"); 97 /*NOTREACHED*/ 98 99 case SOCK_STREAM: 100 #define rcv (&so->so_rcv) 101 #define snd (&so2->so_snd) 102 if (unp->unp_conn == 0) 103 break; 104 so2 = unp->unp_conn->unp_socket; 105 /* 106 * Transfer resources back to send port 107 * and wakeup any waiting to write. 108 */ 109 snd->sb_mbmax += rcv->sb_mbmax - rcv->sb_mbcnt; 110 rcv->sb_mbmax = rcv->sb_mbcnt; 111 snd->sb_hiwat += rcv->sb_hiwat - rcv->sb_cc; 112 rcv->sb_hiwat = rcv->sb_cc; 113 sowwakeup(so2); 114 #undef snd 115 #undef rcv 116 break; 117 118 default: 119 panic("uipc 2"); 120 } 121 break; 122 123 case PRU_SEND: 124 switch (so->so_type) { 125 126 case SOCK_DGRAM: 127 if (nam) { 128 if (unp->unp_conn) { 129 error = EISCONN; 130 break; 131 } 132 error = unp_connect(so, nam); 133 if (error) 134 break; 135 } else { 136 if (unp->unp_conn == 0) { 137 error = ENOTCONN; 138 break; 139 } 140 } 141 so2 = unp->unp_conn->unp_socket; 142 /* BEGIN XXX */ 143 if (rights) { 144 error = unp_internalize(rights); 145 if (error) 146 break; 147 } 148 if (sbspace(&so2->so_rcv) > 0) { 149 /* 150 * There's no record of source socket's 151 * name, so send null name for the moment. 152 */ 153 if (sbappendaddr(&so2->so_rcv, 154 &sun_noname, m, rights)) { 155 sorwakeup(so2); 156 m = 0; 157 } 158 } 159 /* END XXX */ 160 if (nam) 161 unp_disconnect(unp); 162 break; 163 164 case SOCK_STREAM: 165 #define rcv (&so2->so_rcv) 166 #define snd (&so->so_snd) 167 if (rights && rights->m_len) { 168 error = EOPNOTSUPP; 169 break; 170 } 171 if (unp->unp_conn == 0) 172 panic("uipc 3"); 173 so2 = unp->unp_conn->unp_socket; 174 /* 175 * Send to paired receive port, and then 176 * give it enough resources to hold what it already has. 177 * Wake up readers. 178 */ 179 sbappend(rcv, m); 180 snd->sb_mbmax -= rcv->sb_mbcnt - rcv->sb_mbmax; 181 rcv->sb_mbmax = rcv->sb_mbcnt; 182 snd->sb_hiwat -= rcv->sb_cc - rcv->sb_hiwat; 183 rcv->sb_hiwat = rcv->sb_cc; 184 sorwakeup(so2); 185 m = 0; 186 #undef snd 187 #undef rcv 188 break; 189 190 default: 191 panic("uipc 4"); 192 } 193 break; 194 195 case PRU_ABORT: 196 unp_drop(unp, ECONNABORTED); 197 break; 198 199 /* SOME AS YET UNIMPLEMENTED HOOKS */ 200 case PRU_CONTROL: 201 return (EOPNOTSUPP); 202 203 /* END UNIMPLEMENTED HOOKS */ 204 case PRU_SENSE: 205 ((struct stat *) m)->st_blksize = so->so_snd.sb_hiwat; 206 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 207 so2 = unp->unp_conn->unp_socket; 208 ((struct stat *) m)->st_blksize += so2->so_rcv.sb_cc; 209 } 210 return (0); 211 212 case PRU_RCVOOB: 213 return (EOPNOTSUPP); 214 215 case PRU_SENDOOB: 216 error = EOPNOTSUPP; 217 break; 218 219 case PRU_SOCKADDR: 220 break; 221 222 case PRU_PEERADDR: 223 break; 224 225 case PRU_SLOWTIMO: 226 break; 227 228 default: 229 panic("piusrreq"); 230 } 231 release: 232 if (m) 233 m_freem(m); 234 return (error); 235 } 236 237 /* 238 * We assign all buffering for stream sockets to the source, 239 * as that is where the flow control is implemented. 240 * Datagram sockets really use the sendspace as the maximum datagram size, 241 * and don't really want to reserve the sendspace. Their recvspace should 242 * be large enough for at least one max-size datagram plus address. 243 */ 244 #define PIPSIZ 4096 245 int unpst_sendspace = PIPSIZ; 246 int unpst_recvspace = 0; 247 int unpdg_sendspace = 2*1024; /* really max datagram size */ 248 int unpdg_recvspace = 4*1024; 249 250 unp_attach(so) 251 struct socket *so; 252 { 253 register struct mbuf *m; 254 register struct unpcb *unp; 255 int error; 256 257 switch (so->so_type) { 258 259 case SOCK_STREAM: 260 error = soreserve(so, unpst_sendspace, unpst_recvspace); 261 break; 262 263 case SOCK_DGRAM: 264 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 265 break; 266 } 267 if (error) 268 return (error); 269 m = m_getclr(M_DONTWAIT, MT_PCB); 270 if (m == NULL) 271 return (ENOBUFS); 272 unp = mtod(m, struct unpcb *); 273 so->so_pcb = (caddr_t)unp; 274 unp->unp_socket = so; 275 return (0); 276 } 277 278 unp_detach(unp) 279 register struct unpcb *unp; 280 { 281 282 if (unp->unp_inode) { 283 unp->unp_inode->i_socket = 0; 284 irele(unp->unp_inode); 285 unp->unp_inode = 0; 286 } 287 if (unp->unp_conn) 288 unp_disconnect(unp); 289 while (unp->unp_refs) 290 unp_drop(unp->unp_refs, ECONNRESET); 291 soisdisconnected(unp->unp_socket); 292 unp->unp_socket->so_pcb = 0; 293 m_freem(unp->unp_remaddr); 294 (void) m_free(dtom(unp)); 295 } 296 297 unp_bind(unp, nam) 298 struct unpcb *unp; 299 struct mbuf *nam; 300 { 301 struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 302 register struct inode *ip; 303 register struct nameidata *ndp = &u.u_nd; 304 int error; 305 306 ndp->ni_dirp = soun->sun_path; 307 if (nam->m_len == MLEN) 308 return (EINVAL); 309 *(mtod(nam, caddr_t) + nam->m_len) = 0; 310 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 311 ndp->ni_nameiop = CREATE | FOLLOW; 312 ndp->ni_segflg = UIO_SYSSPACE; 313 ip = namei(ndp); 314 if (ip) { 315 iput(ip); 316 return (EADDRINUSE); 317 } 318 if (error = u.u_error) { 319 u.u_error = 0; /* XXX */ 320 return (error); 321 } 322 ip = maknode(IFSOCK | 0777, ndp); 323 if (ip == NULL) { 324 error = u.u_error; /* XXX */ 325 u.u_error = 0; /* XXX */ 326 return (error); 327 } 328 ip->i_socket = unp->unp_socket; 329 unp->unp_inode = ip; 330 iunlock(ip); /* but keep reference */ 331 return (0); 332 } 333 334 unp_connect(so, nam) 335 struct socket *so; 336 struct mbuf *nam; 337 { 338 register struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 339 register struct inode *ip; 340 int error; 341 register struct socket *so2; 342 register struct nameidata *ndp = &u.u_nd; 343 344 ndp->ni_dirp = soun->sun_path; 345 if (nam->m_len + (nam->m_off - MMINOFF) == MLEN) 346 return (EMSGSIZE); 347 *(mtod(nam, caddr_t) + nam->m_len) = 0; 348 ndp->ni_nameiop = LOOKUP | FOLLOW; 349 ndp->ni_segflg = UIO_SYSSPACE; 350 ip = namei(ndp); 351 if (ip == 0) { 352 error = u.u_error; 353 u.u_error = 0; 354 return (error); /* XXX */ 355 } 356 if (access(ip, IWRITE)) { 357 error = u.u_error; 358 u.u_error = 0; /* XXX */ 359 goto bad; 360 } 361 if ((ip->i_mode&IFMT) != IFSOCK) { 362 error = ENOTSOCK; 363 goto bad; 364 } 365 so2 = ip->i_socket; 366 if (so2 == 0) { 367 error = ECONNREFUSED; 368 goto bad; 369 } 370 if (so->so_type != so2->so_type) { 371 error = EPROTOTYPE; 372 goto bad; 373 } 374 if (so->so_proto->pr_flags & PR_CONNREQUIRED && 375 ((so2->so_options&SO_ACCEPTCONN) == 0 || 376 (so2 = sonewconn(so2)) == 0)) { 377 error = ECONNREFUSED; 378 goto bad; 379 } 380 error = unp_connect2(so, nam, so2); 381 bad: 382 iput(ip); 383 return (error); 384 } 385 386 unp_connect2(so, sonam, so2) 387 register struct socket *so; 388 struct mbuf *sonam; 389 register struct socket *so2; 390 { 391 register struct unpcb *unp = sotounpcb(so); 392 register struct unpcb *unp2; 393 394 if (so2->so_type != so->so_type) 395 return (EPROTOTYPE); 396 unp2 = sotounpcb(so2); 397 unp->unp_conn = unp2; 398 switch (so->so_type) { 399 400 case SOCK_DGRAM: 401 unp->unp_nextref = unp2->unp_refs; 402 unp2->unp_refs = unp; 403 soisconnected(so); 404 break; 405 406 case SOCK_STREAM: 407 unp2->unp_conn = unp; 408 if (sonam) 409 unp2->unp_remaddr = m_copy(sonam, 0, (int)M_COPYALL); 410 soisconnected(so2); 411 soisconnected(so); 412 break; 413 414 default: 415 panic("unp_connect2"); 416 } 417 return (0); 418 } 419 420 unp_disconnect(unp) 421 struct unpcb *unp; 422 { 423 register struct unpcb *unp2 = unp->unp_conn; 424 425 if (unp2 == 0) 426 return; 427 unp->unp_conn = 0; 428 switch (unp->unp_socket->so_type) { 429 430 case SOCK_DGRAM: 431 if (unp2->unp_refs == unp) 432 unp2->unp_refs = unp->unp_nextref; 433 else { 434 unp2 = unp2->unp_refs; 435 for (;;) { 436 if (unp2 == 0) 437 panic("unp_disconnect"); 438 if (unp2->unp_nextref == unp) 439 break; 440 unp2 = unp2->unp_nextref; 441 } 442 unp2->unp_nextref = unp->unp_nextref; 443 } 444 unp->unp_nextref = 0; 445 break; 446 447 case SOCK_STREAM: 448 soisdisconnected(unp->unp_socket); 449 unp2->unp_conn = 0; 450 soisdisconnected(unp2->unp_socket); 451 break; 452 } 453 } 454 455 #ifdef notdef 456 unp_abort(unp) 457 struct unpcb *unp; 458 { 459 460 unp_detach(unp); 461 } 462 #endif 463 464 /*ARGSUSED*/ 465 unp_usrclosed(unp) 466 struct unpcb *unp; 467 { 468 469 } 470 471 unp_drop(unp, errno) 472 struct unpcb *unp; 473 int errno; 474 { 475 struct socket *so = unp->unp_socket; 476 477 so->so_error = errno; 478 unp_disconnect(unp); 479 if (so->so_head) { 480 so->so_pcb = (caddr_t) 0; 481 m_freem(unp->unp_remaddr); 482 (void) m_free(dtom(unp)); 483 sofree(so); 484 } 485 } 486 487 #ifdef notdef 488 unp_drain() 489 { 490 491 } 492 #endif 493 494 unp_externalize(rights) 495 struct mbuf *rights; 496 { 497 int newfds = rights->m_len / sizeof (int); 498 register int i; 499 register struct file **rp = mtod(rights, struct file **); 500 register struct file *fp; 501 int f; 502 503 if (newfds > ufavail()) { 504 for (i = 0; i < newfds; i++) { 505 fp = *rp; 506 unp_discard(fp); 507 *rp++ = 0; 508 } 509 return (EMSGSIZE); 510 } 511 for (i = 0; i < newfds; i++) { 512 f = ufalloc(0); 513 if (f < 0) 514 panic("unp_externalize"); 515 fp = *rp; 516 u.u_ofile[f] = fp; 517 fp->f_msgcount--; 518 *(int *)rp++ = f; 519 } 520 return (0); 521 } 522 523 unp_internalize(rights) 524 struct mbuf *rights; 525 { 526 register struct file **rp; 527 int oldfds = rights->m_len / sizeof (int); 528 register int i; 529 register struct file *fp; 530 531 rp = mtod(rights, struct file **); 532 for (i = 0; i < oldfds; i++) 533 if (getf(*(int *)rp++) == 0) 534 return (EBADF); 535 rp = mtod(rights, struct file **); 536 for (i = 0; i < oldfds; i++) { 537 fp = getf(*(int *)rp); 538 *rp++ = fp; 539 fp->f_count++; 540 fp->f_msgcount++; 541 } 542 return (0); 543 } 544 545 int unp_defer, unp_gcing; 546 int unp_mark(); 547 extern struct domain unixdomain; 548 549 unp_gc() 550 { 551 register struct file *fp; 552 register struct socket *so; 553 554 if (unp_gcing) 555 return; 556 unp_gcing = 1; 557 restart: 558 unp_defer = 0; 559 for (fp = file; fp < fileNFILE; fp++) 560 fp->f_flag &= ~(FMARK|FDEFER); 561 do { 562 for (fp = file; fp < fileNFILE; fp++) { 563 if (fp->f_count == 0) 564 continue; 565 if (fp->f_flag & FDEFER) { 566 fp->f_flag &= ~FDEFER; 567 unp_defer--; 568 } else { 569 if (fp->f_flag & FMARK) 570 continue; 571 if (fp->f_count == fp->f_msgcount) 572 continue; 573 fp->f_flag |= FMARK; 574 } 575 if (fp->f_type != DTYPE_SOCKET) 576 continue; 577 so = (struct socket *)fp->f_data; 578 if (so->so_proto->pr_domain != &unixdomain || 579 (so->so_proto->pr_flags&PR_ADDR) == 0) 580 continue; 581 if (so->so_rcv.sb_flags & SB_LOCK) { 582 sbwait(&so->so_rcv); 583 goto restart; 584 } 585 unp_scan(so->so_rcv.sb_mb, unp_mark); 586 } 587 } while (unp_defer); 588 for (fp = file; fp < fileNFILE; fp++) { 589 if (fp->f_count == 0) 590 continue; 591 if (fp->f_count == fp->f_msgcount && (fp->f_flag&FMARK)==0) { 592 if (fp->f_type != DTYPE_SOCKET) 593 panic("unp_gc"); 594 (void) soshutdown((struct socket *)fp->f_data, 0); 595 } 596 } 597 unp_gcing = 0; 598 } 599 600 unp_dispose(m) 601 struct mbuf *m; 602 { 603 int unp_discard(); 604 605 if (m) 606 unp_scan(m, unp_discard); 607 } 608 609 unp_scan(m0, op) 610 register struct mbuf *m0; 611 int (*op)(); 612 { 613 register struct mbuf *m; 614 register struct file **rp; 615 register int i; 616 int qfds; 617 618 while (m0) { 619 for (m = m0; m; m = m->m_next) 620 if (m->m_type == MT_RIGHTS && m->m_len) { 621 qfds = m->m_len / sizeof (struct file *); 622 rp = mtod(m, struct file **); 623 for (i = 0; i < qfds; i++) 624 (*op)(*rp++); 625 break; /* XXX, but saves time */ 626 } 627 m0 = m0->m_act; 628 } 629 } 630 631 unp_mark(fp) 632 struct file *fp; 633 { 634 635 if (fp->f_flag & FMARK) 636 return; 637 unp_defer++; 638 fp->f_flag |= (FMARK|FDEFER); 639 } 640 641 unp_discard(fp) 642 struct file *fp; 643 { 644 645 fp->f_msgcount--; 646 closef(fp); 647 } 648