1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T 28 * All Rights Reserved 29 */ 30 31 /* 32 * Portions of this source code were derived from Berkeley 4.3 BSD 33 * under license from the Regents of the University of California. 34 */ 35 36 37 /* 38 * Implements a kernel based, client side RPC over Connection Oriented 39 * Transports (COTS). 40 */ 41 42 /* 43 * Much of this file has been re-written to let NFS work better over slow 44 * transports. A description follows. 45 * 46 * One of the annoying things about kRPC/COTS is that it will temporarily 47 * create more than one connection between a client and server. This 48 * happens because when a connection is made, the end-points entry in the 49 * linked list of connections (headed by cm_hd), is removed so that other 50 * threads don't mess with it. Went ahead and bit the bullet by keeping 51 * the endpoint on the connection list and introducing state bits, 52 * condition variables etc. to the connection entry data structure (struct 53 * cm_xprt). 54 * 55 * Here is a summary of the changes to cm-xprt: 56 * 57 * x_ctime is the timestamp of when the endpoint was last 58 * connected or disconnected. If an end-point is ever disconnected 59 * or re-connected, then any outstanding RPC request is presumed 60 * lost, telling clnt_cots_kcallit that it needs to re-send the 61 * request, not just wait for the original request's reply to 62 * arrive. 63 * 64 * x_thread flag which tells us if a thread is doing a connection attempt. 65 * 66 * x_waitdis flag which tells us we are waiting a disconnect ACK. 67 * 68 * x_needdis flag which tells us we need to send a T_DISCONN_REQ 69 * to kill the connection. 70 * 71 * x_needrel flag which tells us we need to send a T_ORDREL_REQ to 72 * gracefully close the connection. 73 * 74 * #defined bitmasks for the all the b_* bits so that more 75 * efficient (and at times less clumsy) masks can be used to 76 * manipulated state in cases where multiple bits have to 77 * set/cleared/checked in the same critical section. 78 * 79 * x_conn_cv and x_dis-_cv are new condition variables to let 80 * threads knows when the connection attempt is done, and to let 81 * the connecting thread know when the disconnect handshake is 82 * done. 83 * 84 * Added the CONN_HOLD() macro so that all reference holds have the same 85 * look and feel. 86 * 87 * In the private (cku_private) portion of the client handle, 88 * 89 * cku_flags replaces the cku_sent a boolean. cku_flags keeps 90 * track of whether a request as been sent, and whether the 91 * client's handles call record is on the dispatch list (so that 92 * the reply can be matched by XID to the right client handle). 93 * The idea of CKU_ONQUEUE is that we can exit clnt_cots_kcallit() 94 * and still have the response find the right client handle so 95 * that the retry of CLNT_CALL() gets the result. Testing, found 96 * situations where if the timeout was increased, performance 97 * degraded. This was due to us hitting a window where the thread 98 * was back in rfscall() (probably printing server not responding) 99 * while the response came back but no place to put it. 100 * 101 * cku_ctime is just a cache of x_ctime. If they match, 102 * clnt_cots_kcallit() won't to send a retry (unless the maximum 103 * receive count limit as been reached). If the don't match, then 104 * we assume the request has been lost, and a retry of the request 105 * is needed. 106 * 107 * cku_recv_attempts counts the number of receive count attempts 108 * after one try is sent on the wire. 109 * 110 * Added the clnt_delay() routine so that interruptible and 111 * noninterruptible delays are possible. 112 * 113 * CLNT_MIN_TIMEOUT has been bumped to 10 seconds from 3. This is used to 114 * control how long the client delays before returned after getting 115 * ECONNREFUSED. At 3 seconds, 8 client threads per mount really does bash 116 * a server that may be booting and not yet started nfsd. 117 * 118 * CLNT_MAXRECV_WITHOUT_RETRY is a new macro (value of 3) (with a tunable) 119 * Why don't we just wait forever (receive an infinite # of times)? 120 * Because the server may have rebooted. More insidious is that some 121 * servers (ours) will drop NFS/TCP requests in some cases. This is bad, 122 * but it is a reality. 123 * 124 * The case of a server doing orderly release really messes up the 125 * client's recovery, especially if the server's TCP implementation is 126 * buggy. It was found was that the kRPC/COTS client was breaking some 127 * TPI rules, such as not waiting for the acknowledgement of a 128 * T_DISCON_REQ (hence the added case statements T_ERROR_ACK, T_OK_ACK and 129 * T_DISCON_REQ in clnt_dispatch_notifyall()). 130 * 131 * One of things that we've seen is that a kRPC TCP endpoint goes into 132 * TIMEWAIT and a thus a reconnect takes a long time to satisfy because 133 * that the TIMEWAIT state takes a while to finish. If a server sends a 134 * T_ORDREL_IND, there is little point in an RPC client doing a 135 * T_ORDREL_REQ, because the RPC request isn't going to make it (the 136 * server is saying that it won't accept any more data). So kRPC was 137 * changed to send a T_DISCON_REQ when we get a T_ORDREL_IND. So now the 138 * connection skips the TIMEWAIT state and goes straight to a bound state 139 * that kRPC can quickly switch to connected. 140 * 141 * Code that issues TPI request must use waitforack() to wait for the 142 * corresponding ack (assuming there is one) in any future modifications. 143 * This works around problems that may be introduced by breaking TPI rules 144 * (by submitting new calls before earlier requests have been acked) in the 145 * case of a signal or other early return. waitforack() depends on 146 * clnt_dispatch_notifyconn() to issue the wakeup when the ack 147 * arrives, so adding new TPI calls may require corresponding changes 148 * to clnt_dispatch_notifyconn(). Presently, the timeout period is based on 149 * CLNT_MIN_TIMEOUT which is 10 seconds. If you modify this value, be sure 150 * not to set it too low or TPI ACKS will be lost. 151 */ 152 153 #include <sys/param.h> 154 #include <sys/types.h> 155 #include <sys/user.h> 156 #include <sys/systm.h> 157 #include <sys/sysmacros.h> 158 #include <sys/proc.h> 159 #include <sys/socket.h> 160 #include <sys/file.h> 161 #include <sys/stream.h> 162 #include <sys/strsubr.h> 163 #include <sys/stropts.h> 164 #include <sys/strsun.h> 165 #include <sys/timod.h> 166 #include <sys/tiuser.h> 167 #include <sys/tihdr.h> 168 #include <sys/t_kuser.h> 169 #include <sys/fcntl.h> 170 #include <sys/errno.h> 171 #include <sys/kmem.h> 172 #include <sys/debug.h> 173 #include <sys/systm.h> 174 #include <sys/kstat.h> 175 #include <sys/t_lock.h> 176 #include <sys/ddi.h> 177 #include <sys/cmn_err.h> 178 #include <sys/time.h> 179 #include <sys/isa_defs.h> 180 #include <sys/callb.h> 181 #include <sys/sunddi.h> 182 #include <sys/atomic.h> 183 #include <sys/sdt.h> 184 185 #include <netinet/in.h> 186 #include <netinet/tcp.h> 187 188 #include <rpc/types.h> 189 #include <rpc/xdr.h> 190 #include <rpc/auth.h> 191 #include <rpc/clnt.h> 192 #include <rpc/rpc_msg.h> 193 194 #define COTS_DEFAULT_ALLOCSIZE 2048 195 196 #define WIRE_HDR_SIZE 20 /* serialized call header, sans proc number */ 197 #define MSG_OFFSET 128 /* offset of call into the mblk */ 198 199 const char *kinet_ntop6(uchar_t *, char *, size_t); 200 201 static int clnt_cots_ksettimers(CLIENT *, struct rpc_timers *, 202 struct rpc_timers *, int, void(*)(int, int, caddr_t), caddr_t, uint32_t); 203 static enum clnt_stat clnt_cots_kcallit(CLIENT *, rpcproc_t, xdrproc_t, 204 caddr_t, xdrproc_t, caddr_t, struct timeval); 205 static void clnt_cots_kabort(CLIENT *); 206 static void clnt_cots_kerror(CLIENT *, struct rpc_err *); 207 static bool_t clnt_cots_kfreeres(CLIENT *, xdrproc_t, caddr_t); 208 static void clnt_cots_kdestroy(CLIENT *); 209 static bool_t clnt_cots_kcontrol(CLIENT *, int, char *); 210 211 212 /* List of transports managed by the connection manager. */ 213 struct cm_xprt { 214 TIUSER *x_tiptr; /* transport handle */ 215 queue_t *x_wq; /* send queue */ 216 clock_t x_time; /* last time we handed this xprt out */ 217 clock_t x_ctime; /* time we went to CONNECTED */ 218 int x_tidu_size; /* TIDU size of this transport */ 219 union { 220 struct { 221 unsigned int 222 #ifdef _BIT_FIELDS_HTOL 223 b_closing: 1, /* we've sent a ord rel on this conn */ 224 b_dead: 1, /* transport is closed or disconn */ 225 b_doomed: 1, /* too many conns, let this go idle */ 226 b_connected: 1, /* this connection is connected */ 227 228 b_ordrel: 1, /* do an orderly release? */ 229 b_thread: 1, /* thread doing connect */ 230 b_waitdis: 1, /* waiting for disconnect ACK */ 231 b_needdis: 1, /* need T_DISCON_REQ */ 232 233 b_needrel: 1, /* need T_ORDREL_REQ */ 234 b_early_disc: 1, /* got a T_ORDREL_IND or T_DISCON_IND */ 235 /* disconnect during connect */ 236 237 b_pad: 22; 238 239 #endif 240 241 #ifdef _BIT_FIELDS_LTOH 242 b_pad: 22, 243 244 b_early_disc: 1, /* got a T_ORDREL_IND or T_DISCON_IND */ 245 /* disconnect during connect */ 246 b_needrel: 1, /* need T_ORDREL_REQ */ 247 248 b_needdis: 1, /* need T_DISCON_REQ */ 249 b_waitdis: 1, /* waiting for disconnect ACK */ 250 b_thread: 1, /* thread doing connect */ 251 b_ordrel: 1, /* do an orderly release? */ 252 253 b_connected: 1, /* this connection is connected */ 254 b_doomed: 1, /* too many conns, let this go idle */ 255 b_dead: 1, /* transport is closed or disconn */ 256 b_closing: 1; /* we've sent a ord rel on this conn */ 257 #endif 258 } bit; unsigned int word; 259 260 #define x_closing x_state.bit.b_closing 261 #define x_dead x_state.bit.b_dead 262 #define x_doomed x_state.bit.b_doomed 263 #define x_connected x_state.bit.b_connected 264 265 #define x_ordrel x_state.bit.b_ordrel 266 #define x_thread x_state.bit.b_thread 267 #define x_waitdis x_state.bit.b_waitdis 268 #define x_needdis x_state.bit.b_needdis 269 270 #define x_needrel x_state.bit.b_needrel 271 #define x_early_disc x_state.bit.b_early_disc 272 273 #define x_state_flags x_state.word 274 275 #define X_CLOSING 0x80000000 276 #define X_DEAD 0x40000000 277 #define X_DOOMED 0x20000000 278 #define X_CONNECTED 0x10000000 279 280 #define X_ORDREL 0x08000000 281 #define X_THREAD 0x04000000 282 #define X_WAITDIS 0x02000000 283 #define X_NEEDDIS 0x01000000 284 285 #define X_NEEDREL 0x00800000 286 #define X_EARLYDISC 0x00400000 287 288 #define X_BADSTATES (X_CLOSING | X_DEAD | X_DOOMED) 289 290 } x_state; 291 int x_ref; /* number of users of this xprt */ 292 int x_family; /* address family of transport */ 293 dev_t x_rdev; /* device number of transport */ 294 struct cm_xprt *x_next; 295 296 struct netbuf x_server; /* destination address */ 297 struct netbuf x_src; /* src address (for retries) */ 298 kmutex_t x_lock; /* lock on this entry */ 299 kcondvar_t x_cv; /* to signal when can be closed */ 300 kcondvar_t x_conn_cv; /* to signal when connection attempt */ 301 /* is complete */ 302 kstat_t *x_ksp; 303 304 kcondvar_t x_dis_cv; /* to signal when disconnect attempt */ 305 /* is complete */ 306 zoneid_t x_zoneid; /* zone this xprt belongs to */ 307 }; 308 309 typedef struct cm_kstat_xprt { 310 kstat_named_t x_wq; 311 kstat_named_t x_server; 312 kstat_named_t x_family; 313 kstat_named_t x_rdev; 314 kstat_named_t x_time; 315 kstat_named_t x_state; 316 kstat_named_t x_ref; 317 kstat_named_t x_port; 318 } cm_kstat_xprt_t; 319 320 static cm_kstat_xprt_t cm_kstat_template = { 321 { "write_queue", KSTAT_DATA_UINT32 }, 322 { "server", KSTAT_DATA_STRING }, 323 { "addr_family", KSTAT_DATA_UINT32 }, 324 { "device", KSTAT_DATA_UINT32 }, 325 { "time_stamp", KSTAT_DATA_UINT32 }, 326 { "status", KSTAT_DATA_UINT32 }, 327 { "ref_count", KSTAT_DATA_INT32 }, 328 { "port", KSTAT_DATA_UINT32 }, 329 }; 330 331 /* 332 * The inverse of this is connmgr_release(). 333 */ 334 #define CONN_HOLD(Cm_entry) {\ 335 mutex_enter(&(Cm_entry)->x_lock); \ 336 (Cm_entry)->x_ref++; \ 337 mutex_exit(&(Cm_entry)->x_lock); \ 338 } 339 340 341 /* 342 * Private data per rpc handle. This structure is allocated by 343 * clnt_cots_kcreate, and freed by clnt_cots_kdestroy. 344 */ 345 typedef struct cku_private_s { 346 CLIENT cku_client; /* client handle */ 347 calllist_t cku_call; /* for dispatching calls */ 348 struct rpc_err cku_err; /* error status */ 349 350 struct netbuf cku_srcaddr; /* source address for retries */ 351 int cku_addrfmly; /* for binding port */ 352 struct netbuf cku_addr; /* remote address */ 353 dev_t cku_device; /* device to use */ 354 uint_t cku_flags; 355 #define CKU_ONQUEUE 0x1 356 #define CKU_SENT 0x2 357 358 bool_t cku_progress; /* for CLSET_PROGRESS */ 359 uint32_t cku_xid; /* current XID */ 360 clock_t cku_ctime; /* time stamp of when */ 361 /* connection was created */ 362 uint_t cku_recv_attempts; 363 XDR cku_outxdr; /* xdr routine for output */ 364 XDR cku_inxdr; /* xdr routine for input */ 365 char cku_rpchdr[WIRE_HDR_SIZE + 4]; 366 /* pre-serialized rpc header */ 367 368 uint_t cku_outbuflen; /* default output mblk length */ 369 struct cred *cku_cred; /* credentials */ 370 bool_t cku_nodelayonerr; 371 /* for CLSET_NODELAYONERR */ 372 int cku_useresvport; /* Use reserved port */ 373 struct rpc_cots_client *cku_stats; /* stats for zone */ 374 } cku_private_t; 375 376 static struct cm_xprt *connmgr_wrapconnect(struct cm_xprt *, 377 const struct timeval *, struct netbuf *, int, struct netbuf *, 378 struct rpc_err *, bool_t, bool_t, cred_t *); 379 380 static bool_t connmgr_connect(struct cm_xprt *, queue_t *, struct netbuf *, 381 int, calllist_t *, int *, bool_t reconnect, 382 const struct timeval *, bool_t, cred_t *); 383 384 static bool_t connmgr_setopt(queue_t *, int, int, calllist_t *, cred_t *cr); 385 static void connmgr_sndrel(struct cm_xprt *); 386 static void connmgr_snddis(struct cm_xprt *); 387 static void connmgr_close(struct cm_xprt *); 388 static void connmgr_release(struct cm_xprt *); 389 static struct cm_xprt *connmgr_wrapget(struct netbuf *, const struct timeval *, 390 cku_private_t *); 391 392 static struct cm_xprt *connmgr_get(struct netbuf *, const struct timeval *, 393 struct netbuf *, int, struct netbuf *, struct rpc_err *, dev_t, 394 bool_t, int, cred_t *); 395 396 static void connmgr_cancelconn(struct cm_xprt *); 397 static enum clnt_stat connmgr_cwait(struct cm_xprt *, const struct timeval *, 398 bool_t); 399 static void connmgr_dis_and_wait(struct cm_xprt *); 400 401 static int clnt_dispatch_send(queue_t *, mblk_t *, calllist_t *, uint_t, 402 uint_t); 403 404 static int clnt_delay(clock_t, bool_t); 405 406 static int waitforack(calllist_t *, t_scalar_t, const struct timeval *, bool_t); 407 408 /* 409 * Operations vector for TCP/IP based RPC 410 */ 411 static struct clnt_ops tcp_ops = { 412 clnt_cots_kcallit, /* do rpc call */ 413 clnt_cots_kabort, /* abort call */ 414 clnt_cots_kerror, /* return error status */ 415 clnt_cots_kfreeres, /* free results */ 416 clnt_cots_kdestroy, /* destroy rpc handle */ 417 clnt_cots_kcontrol, /* the ioctl() of rpc */ 418 clnt_cots_ksettimers, /* set retry timers */ 419 }; 420 421 static int rpc_kstat_instance = 0; /* keeps the current instance */ 422 /* number for the next kstat_create */ 423 424 static struct cm_xprt *cm_hd = NULL; 425 static kmutex_t connmgr_lock; /* for connection mngr's list of transports */ 426 427 extern kmutex_t clnt_max_msg_lock; 428 429 static calllist_t *clnt_pending = NULL; 430 extern kmutex_t clnt_pending_lock; 431 432 static int clnt_cots_hash_size = DEFAULT_HASH_SIZE; 433 434 static call_table_t *cots_call_ht; 435 436 static const struct rpc_cots_client { 437 kstat_named_t rccalls; 438 kstat_named_t rcbadcalls; 439 kstat_named_t rcbadxids; 440 kstat_named_t rctimeouts; 441 kstat_named_t rcnewcreds; 442 kstat_named_t rcbadverfs; 443 kstat_named_t rctimers; 444 kstat_named_t rccantconn; 445 kstat_named_t rcnomem; 446 kstat_named_t rcintrs; 447 } cots_rcstat_tmpl = { 448 { "calls", KSTAT_DATA_UINT64 }, 449 { "badcalls", KSTAT_DATA_UINT64 }, 450 { "badxids", KSTAT_DATA_UINT64 }, 451 { "timeouts", KSTAT_DATA_UINT64 }, 452 { "newcreds", KSTAT_DATA_UINT64 }, 453 { "badverfs", KSTAT_DATA_UINT64 }, 454 { "timers", KSTAT_DATA_UINT64 }, 455 { "cantconn", KSTAT_DATA_UINT64 }, 456 { "nomem", KSTAT_DATA_UINT64 }, 457 { "interrupts", KSTAT_DATA_UINT64 } 458 }; 459 460 #define COTSRCSTAT_INCR(p, x) \ 461 atomic_add_64(&(p)->x.value.ui64, 1) 462 463 #define CLNT_MAX_CONNS 1 /* concurrent connections between clnt/srvr */ 464 static int clnt_max_conns = CLNT_MAX_CONNS; 465 466 #define CLNT_MIN_TIMEOUT 10 /* seconds to wait after we get a */ 467 /* connection reset */ 468 #define CLNT_MIN_CONNTIMEOUT 5 /* seconds to wait for a connection */ 469 470 471 static int clnt_cots_min_tout = CLNT_MIN_TIMEOUT; 472 static int clnt_cots_min_conntout = CLNT_MIN_CONNTIMEOUT; 473 474 /* 475 * Limit the number of times we will attempt to receive a reply without 476 * re-sending a response. 477 */ 478 #define CLNT_MAXRECV_WITHOUT_RETRY 3 479 static uint_t clnt_cots_maxrecv = CLNT_MAXRECV_WITHOUT_RETRY; 480 481 uint_t *clnt_max_msg_sizep; 482 void (*clnt_stop_idle)(queue_t *wq); 483 484 #define ptoh(p) (&((p)->cku_client)) 485 #define htop(h) ((cku_private_t *)((h)->cl_private)) 486 487 /* 488 * Times to retry 489 */ 490 #define REFRESHES 2 /* authentication refreshes */ 491 492 /* 493 * The following is used to determine the global default behavior for 494 * COTS when binding to a local port. 495 * 496 * If the value is set to 1 the default will be to select a reserved 497 * (aka privileged) port, if the value is zero the default will be to 498 * use non-reserved ports. Users of kRPC may override this by using 499 * CLNT_CONTROL() and CLSET_BINDRESVPORT. 500 */ 501 static int clnt_cots_do_bindresvport = 1; 502 503 static zone_key_t zone_cots_key; 504 505 /* 506 * We need to do this after all kernel threads in the zone have exited. 507 */ 508 /* ARGSUSED */ 509 static void 510 clnt_zone_destroy(zoneid_t zoneid, void *unused) 511 { 512 struct cm_xprt **cmp; 513 struct cm_xprt *cm_entry; 514 struct cm_xprt *freelist = NULL; 515 516 mutex_enter(&connmgr_lock); 517 cmp = &cm_hd; 518 while ((cm_entry = *cmp) != NULL) { 519 if (cm_entry->x_zoneid == zoneid) { 520 *cmp = cm_entry->x_next; 521 cm_entry->x_next = freelist; 522 freelist = cm_entry; 523 } else { 524 cmp = &cm_entry->x_next; 525 } 526 } 527 mutex_exit(&connmgr_lock); 528 while ((cm_entry = freelist) != NULL) { 529 freelist = cm_entry->x_next; 530 connmgr_close(cm_entry); 531 } 532 } 533 534 int 535 clnt_cots_kcreate(dev_t dev, struct netbuf *addr, int family, rpcprog_t prog, 536 rpcvers_t vers, uint_t max_msgsize, cred_t *cred, CLIENT **ncl) 537 { 538 CLIENT *h; 539 cku_private_t *p; 540 struct rpc_msg call_msg; 541 struct rpcstat *rpcstat; 542 543 RPCLOG(8, "clnt_cots_kcreate: prog %u\n", prog); 544 545 rpcstat = zone_getspecific(rpcstat_zone_key, rpc_zone()); 546 ASSERT(rpcstat != NULL); 547 548 /* Allocate and intialize the client handle. */ 549 p = kmem_zalloc(sizeof (*p), KM_SLEEP); 550 551 h = ptoh(p); 552 553 h->cl_private = (caddr_t)p; 554 h->cl_auth = authkern_create(); 555 h->cl_ops = &tcp_ops; 556 557 cv_init(&p->cku_call.call_cv, NULL, CV_DEFAULT, NULL); 558 mutex_init(&p->cku_call.call_lock, NULL, MUTEX_DEFAULT, NULL); 559 560 /* 561 * If the current sanity check size in rpcmod is smaller 562 * than the size needed, then increase the sanity check. 563 */ 564 if (max_msgsize != 0 && clnt_max_msg_sizep != NULL && 565 max_msgsize > *clnt_max_msg_sizep) { 566 mutex_enter(&clnt_max_msg_lock); 567 if (max_msgsize > *clnt_max_msg_sizep) 568 *clnt_max_msg_sizep = max_msgsize; 569 mutex_exit(&clnt_max_msg_lock); 570 } 571 572 p->cku_outbuflen = COTS_DEFAULT_ALLOCSIZE; 573 574 /* Preserialize the call message header */ 575 576 call_msg.rm_xid = 0; 577 call_msg.rm_direction = CALL; 578 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 579 call_msg.rm_call.cb_prog = prog; 580 call_msg.rm_call.cb_vers = vers; 581 582 xdrmem_create(&p->cku_outxdr, p->cku_rpchdr, WIRE_HDR_SIZE, XDR_ENCODE); 583 584 if (!xdr_callhdr(&p->cku_outxdr, &call_msg)) { 585 RPCLOG0(1, "clnt_cots_kcreate - Fatal header serialization " 586 "error\n"); 587 auth_destroy(h->cl_auth); 588 kmem_free(p, sizeof (cku_private_t)); 589 RPCLOG0(1, "clnt_cots_kcreate: create failed error EINVAL\n"); 590 return (EINVAL); /* XXX */ 591 } 592 593 /* 594 * The zalloc initialized the fields below. 595 * p->cku_xid = 0; 596 * p->cku_flags = 0; 597 * p->cku_srcaddr.len = 0; 598 * p->cku_srcaddr.maxlen = 0; 599 */ 600 601 p->cku_cred = cred; 602 p->cku_device = dev; 603 p->cku_addrfmly = family; 604 p->cku_addr.buf = kmem_zalloc(addr->maxlen, KM_SLEEP); 605 p->cku_addr.maxlen = addr->maxlen; 606 p->cku_addr.len = addr->len; 607 bcopy(addr->buf, p->cku_addr.buf, addr->len); 608 p->cku_stats = rpcstat->rpc_cots_client; 609 p->cku_useresvport = -1; /* value is has not been set */ 610 611 *ncl = h; 612 return (0); 613 } 614 615 /*ARGSUSED*/ 616 static void 617 clnt_cots_kabort(CLIENT *h) 618 { 619 } 620 621 /* 622 * Return error info on this handle. 623 */ 624 static void 625 clnt_cots_kerror(CLIENT *h, struct rpc_err *err) 626 { 627 /* LINTED pointer alignment */ 628 cku_private_t *p = htop(h); 629 630 *err = p->cku_err; 631 } 632 633 static bool_t 634 clnt_cots_kfreeres(CLIENT *h, xdrproc_t xdr_res, caddr_t res_ptr) 635 { 636 /* LINTED pointer alignment */ 637 cku_private_t *p = htop(h); 638 XDR *xdrs; 639 640 xdrs = &(p->cku_outxdr); 641 xdrs->x_op = XDR_FREE; 642 return ((*xdr_res)(xdrs, res_ptr)); 643 } 644 645 static bool_t 646 clnt_cots_kcontrol(CLIENT *h, int cmd, char *arg) 647 { 648 cku_private_t *p = htop(h); 649 650 switch (cmd) { 651 case CLSET_PROGRESS: 652 p->cku_progress = TRUE; 653 return (TRUE); 654 655 case CLSET_XID: 656 if (arg == NULL) 657 return (FALSE); 658 659 p->cku_xid = *((uint32_t *)arg); 660 return (TRUE); 661 662 case CLGET_XID: 663 if (arg == NULL) 664 return (FALSE); 665 666 *((uint32_t *)arg) = p->cku_xid; 667 return (TRUE); 668 669 case CLSET_NODELAYONERR: 670 if (arg == NULL) 671 return (FALSE); 672 673 if (*((bool_t *)arg) == TRUE) { 674 p->cku_nodelayonerr = TRUE; 675 return (TRUE); 676 } 677 if (*((bool_t *)arg) == FALSE) { 678 p->cku_nodelayonerr = FALSE; 679 return (TRUE); 680 } 681 return (FALSE); 682 683 case CLGET_NODELAYONERR: 684 if (arg == NULL) 685 return (FALSE); 686 687 *((bool_t *)arg) = p->cku_nodelayonerr; 688 return (TRUE); 689 690 case CLSET_BINDRESVPORT: 691 if (arg == NULL) 692 return (FALSE); 693 694 if (*(int *)arg != 1 && *(int *)arg != 0) 695 return (FALSE); 696 697 p->cku_useresvport = *(int *)arg; 698 699 return (TRUE); 700 701 case CLGET_BINDRESVPORT: 702 if (arg == NULL) 703 return (FALSE); 704 705 *(int *)arg = p->cku_useresvport; 706 707 return (TRUE); 708 709 default: 710 return (FALSE); 711 } 712 } 713 714 /* 715 * Destroy rpc handle. Frees the space used for output buffer, 716 * private data, and handle structure. 717 */ 718 static void 719 clnt_cots_kdestroy(CLIENT *h) 720 { 721 /* LINTED pointer alignment */ 722 cku_private_t *p = htop(h); 723 calllist_t *call = &p->cku_call; 724 725 RPCLOG(8, "clnt_cots_kdestroy h: %p\n", (void *)h); 726 RPCLOG(8, "clnt_cots_kdestroy h: xid=0x%x\n", p->cku_xid); 727 728 if (p->cku_flags & CKU_ONQUEUE) { 729 RPCLOG(64, "clnt_cots_kdestroy h: removing call for xid 0x%x " 730 "from dispatch list\n", p->cku_xid); 731 call_table_remove(call); 732 } 733 734 if (call->call_reply) 735 freemsg(call->call_reply); 736 cv_destroy(&call->call_cv); 737 mutex_destroy(&call->call_lock); 738 739 kmem_free(p->cku_srcaddr.buf, p->cku_srcaddr.maxlen); 740 kmem_free(p->cku_addr.buf, p->cku_addr.maxlen); 741 kmem_free(p, sizeof (*p)); 742 } 743 744 static int clnt_cots_pulls; 745 #define RM_HDR_SIZE 4 /* record mark header size */ 746 747 /* 748 * Call remote procedure. 749 */ 750 static enum clnt_stat 751 clnt_cots_kcallit(CLIENT *h, rpcproc_t procnum, xdrproc_t xdr_args, 752 caddr_t argsp, xdrproc_t xdr_results, caddr_t resultsp, struct timeval wait) 753 { 754 /* LINTED pointer alignment */ 755 cku_private_t *p = htop(h); 756 calllist_t *call = &p->cku_call; 757 XDR *xdrs; 758 struct rpc_msg reply_msg; 759 mblk_t *mp; 760 #ifdef RPCDEBUG 761 clock_t time_sent; 762 #endif 763 struct netbuf *retryaddr; 764 struct cm_xprt *cm_entry = NULL; 765 queue_t *wq; 766 int len, waitsecs, max_waitsecs; 767 int mpsize; 768 int refreshes = REFRESHES; 769 int interrupted; 770 int tidu_size; 771 enum clnt_stat status; 772 struct timeval cwait; 773 bool_t delay_first = FALSE; 774 clock_t ticks; 775 776 RPCLOG(2, "clnt_cots_kcallit, procnum %u\n", procnum); 777 COTSRCSTAT_INCR(p->cku_stats, rccalls); 778 779 RPCLOG(2, "clnt_cots_kcallit: wait.tv_sec: %ld\n", wait.tv_sec); 780 RPCLOG(2, "clnt_cots_kcallit: wait.tv_usec: %ld\n", wait.tv_usec); 781 /* 782 * Bug ID 1240234: 783 * Look out for zero length timeouts. We don't want to 784 * wait zero seconds for a connection to be established. 785 */ 786 if (wait.tv_sec < clnt_cots_min_conntout) { 787 cwait.tv_sec = clnt_cots_min_conntout; 788 cwait.tv_usec = 0; 789 RPCLOG(8, "clnt_cots_kcallit: wait.tv_sec (%ld) too low,", 790 wait.tv_sec); 791 RPCLOG(8, " setting to: %d\n", clnt_cots_min_conntout); 792 } else { 793 cwait = wait; 794 } 795 796 call_again: 797 if (cm_entry) { 798 connmgr_release(cm_entry); 799 cm_entry = NULL; 800 } 801 802 mp = NULL; 803 804 /* 805 * If the call is not a retry, allocate a new xid and cache it 806 * for future retries. 807 * Bug ID 1246045: 808 * Treat call as a retry for purposes of binding the source 809 * port only if we actually attempted to send anything on 810 * the previous call. 811 */ 812 if (p->cku_xid == 0) { 813 p->cku_xid = alloc_xid(); 814 call->call_zoneid = rpc_zoneid(); 815 816 /* 817 * We need to ASSERT here that our xid != 0 because this 818 * determines whether or not our call record gets placed on 819 * the hash table or the linked list. By design, we mandate 820 * that RPC calls over cots must have xid's != 0, so we can 821 * ensure proper management of the hash table. 822 */ 823 ASSERT(p->cku_xid != 0); 824 825 retryaddr = NULL; 826 p->cku_flags &= ~CKU_SENT; 827 828 if (p->cku_flags & CKU_ONQUEUE) { 829 RPCLOG(8, "clnt_cots_kcallit: new call, dequeuing old" 830 " one (%p)\n", (void *)call); 831 call_table_remove(call); 832 p->cku_flags &= ~CKU_ONQUEUE; 833 RPCLOG(64, "clnt_cots_kcallit: removing call from " 834 "dispatch list because xid was zero (now 0x%x)\n", 835 p->cku_xid); 836 } 837 838 if (call->call_reply != NULL) { 839 freemsg(call->call_reply); 840 call->call_reply = NULL; 841 } 842 } else if (p->cku_srcaddr.buf == NULL || p->cku_srcaddr.len == 0) { 843 retryaddr = NULL; 844 845 } else if (p->cku_flags & CKU_SENT) { 846 retryaddr = &p->cku_srcaddr; 847 848 } else { 849 /* 850 * Bug ID 1246045: Nothing was sent, so set retryaddr to 851 * NULL and let connmgr_get() bind to any source port it 852 * can get. 853 */ 854 retryaddr = NULL; 855 } 856 857 RPCLOG(64, "clnt_cots_kcallit: xid = 0x%x", p->cku_xid); 858 RPCLOG(64, " flags = 0x%x\n", p->cku_flags); 859 860 p->cku_err.re_status = RPC_TIMEDOUT; 861 p->cku_err.re_errno = p->cku_err.re_terrno = 0; 862 863 cm_entry = connmgr_wrapget(retryaddr, &cwait, p); 864 865 if (cm_entry == NULL) { 866 RPCLOG(1, "clnt_cots_kcallit: can't connect status %s\n", 867 clnt_sperrno(p->cku_err.re_status)); 868 869 /* 870 * The reasons why we fail to create a connection are 871 * varied. In most cases we don't want the caller to 872 * immediately retry. This could have one or more 873 * bad effects. This includes flooding the net with 874 * connect requests to ports with no listener; a hard 875 * kernel loop due to all the "reserved" TCP ports being 876 * in use. 877 */ 878 delay_first = TRUE; 879 880 /* 881 * Even if we end up returning EINTR, we still count a 882 * a "can't connect", because the connection manager 883 * might have been committed to waiting for or timing out on 884 * a connection. 885 */ 886 COTSRCSTAT_INCR(p->cku_stats, rccantconn); 887 switch (p->cku_err.re_status) { 888 case RPC_INTR: 889 p->cku_err.re_errno = EINTR; 890 891 /* 892 * No need to delay because a UNIX signal(2) 893 * interrupted us. The caller likely won't 894 * retry the CLNT_CALL() and even if it does, 895 * we assume the caller knows what it is doing. 896 */ 897 delay_first = FALSE; 898 break; 899 900 case RPC_TIMEDOUT: 901 p->cku_err.re_errno = ETIMEDOUT; 902 903 /* 904 * No need to delay because timed out already 905 * on the connection request and assume that the 906 * transport time out is longer than our minimum 907 * timeout, or least not too much smaller. 908 */ 909 delay_first = FALSE; 910 break; 911 912 case RPC_SYSTEMERROR: 913 case RPC_TLIERROR: 914 /* 915 * We want to delay here because a transient 916 * system error has a better chance of going away 917 * if we delay a bit. If it's not transient, then 918 * we don't want end up in a hard kernel loop 919 * due to retries. 920 */ 921 ASSERT(p->cku_err.re_errno != 0); 922 break; 923 924 925 case RPC_CANTCONNECT: 926 /* 927 * RPC_CANTCONNECT is set on T_ERROR_ACK which 928 * implies some error down in the TCP layer or 929 * below. If cku_nodelayonerror is set then we 930 * assume the caller knows not to try too hard. 931 */ 932 RPCLOG0(8, "clnt_cots_kcallit: connection failed,"); 933 RPCLOG0(8, " re_status=RPC_CANTCONNECT,"); 934 RPCLOG(8, " re_errno=%d,", p->cku_err.re_errno); 935 RPCLOG(8, " cku_nodelayonerr=%d", p->cku_nodelayonerr); 936 if (p->cku_nodelayonerr == TRUE) 937 delay_first = FALSE; 938 939 p->cku_err.re_errno = EIO; 940 941 break; 942 943 case RPC_XPRTFAILED: 944 /* 945 * We want to delay here because we likely 946 * got a refused connection. 947 */ 948 if (p->cku_err.re_errno == 0) 949 p->cku_err.re_errno = EIO; 950 951 RPCLOG(1, "clnt_cots_kcallit: transport failed: %d\n", 952 p->cku_err.re_errno); 953 954 break; 955 956 default: 957 /* 958 * We delay here because it is better to err 959 * on the side of caution. If we got here then 960 * status could have been RPC_SUCCESS, but we 961 * know that we did not get a connection, so 962 * force the rpc status to RPC_CANTCONNECT. 963 */ 964 p->cku_err.re_status = RPC_CANTCONNECT; 965 p->cku_err.re_errno = EIO; 966 break; 967 } 968 if (delay_first == TRUE) 969 ticks = clnt_cots_min_tout * drv_usectohz(1000000); 970 goto cots_done; 971 } 972 973 /* 974 * If we've never sent any request on this connection (send count 975 * is zero, or the connection has been reset), cache the 976 * the connection's create time and send a request (possibly a retry) 977 */ 978 if ((p->cku_flags & CKU_SENT) == 0 || 979 p->cku_ctime != cm_entry->x_ctime) { 980 p->cku_ctime = cm_entry->x_ctime; 981 982 } else if ((p->cku_flags & CKU_SENT) && (p->cku_flags & CKU_ONQUEUE) && 983 (call->call_reply != NULL || 984 p->cku_recv_attempts < clnt_cots_maxrecv)) { 985 986 /* 987 * If we've sent a request and our call is on the dispatch 988 * queue and we haven't made too many receive attempts, then 989 * don't re-send, just receive. 990 */ 991 p->cku_recv_attempts++; 992 goto read_again; 993 } 994 995 /* 996 * Now we create the RPC request in a STREAMS message. We have to do 997 * this after the call to connmgr_get so that we have the correct 998 * TIDU size for the transport. 999 */ 1000 tidu_size = cm_entry->x_tidu_size; 1001 len = MSG_OFFSET + MAX(tidu_size, RM_HDR_SIZE + WIRE_HDR_SIZE); 1002 1003 while ((mp = allocb(len, BPRI_MED)) == NULL) { 1004 if (strwaitbuf(len, BPRI_MED)) { 1005 p->cku_err.re_status = RPC_SYSTEMERROR; 1006 p->cku_err.re_errno = ENOSR; 1007 COTSRCSTAT_INCR(p->cku_stats, rcnomem); 1008 goto cots_done; 1009 } 1010 } 1011 xdrs = &p->cku_outxdr; 1012 xdrmblk_init(xdrs, mp, XDR_ENCODE, tidu_size); 1013 mpsize = MBLKSIZE(mp); 1014 ASSERT(mpsize >= len); 1015 ASSERT(mp->b_rptr == mp->b_datap->db_base); 1016 1017 /* 1018 * If the size of mblk is not appreciably larger than what we 1019 * asked, then resize the mblk to exactly len bytes. The reason for 1020 * this: suppose len is 1600 bytes, the tidu is 1460 bytes 1021 * (from TCP over ethernet), and the arguments to the RPC require 1022 * 2800 bytes. Ideally we want the protocol to render two 1023 * ~1400 byte segments over the wire. However if allocb() gives us a 2k 1024 * mblk, and we allocate a second mblk for the remainder, the protocol 1025 * module may generate 3 segments over the wire: 1026 * 1460 bytes for the first, 448 (2048 - 1600) for the second, and 1027 * 892 for the third. If we "waste" 448 bytes in the first mblk, 1028 * the XDR encoding will generate two ~1400 byte mblks, and the 1029 * protocol module is more likely to produce properly sized segments. 1030 */ 1031 if ((mpsize >> 1) <= len) 1032 mp->b_rptr += (mpsize - len); 1033 1034 /* 1035 * Adjust b_rptr to reserve space for the non-data protocol headers 1036 * any downstream modules might like to add, and for the 1037 * record marking header. 1038 */ 1039 mp->b_rptr += (MSG_OFFSET + RM_HDR_SIZE); 1040 1041 if (h->cl_auth->ah_cred.oa_flavor != RPCSEC_GSS) { 1042 /* Copy in the preserialized RPC header information. */ 1043 bcopy(p->cku_rpchdr, mp->b_rptr, WIRE_HDR_SIZE); 1044 1045 /* Use XDR_SETPOS() to set the b_wptr to past the RPC header. */ 1046 XDR_SETPOS(xdrs, (uint_t)(mp->b_rptr - mp->b_datap->db_base + 1047 WIRE_HDR_SIZE)); 1048 1049 ASSERT((mp->b_wptr - mp->b_rptr) == WIRE_HDR_SIZE); 1050 1051 /* Serialize the procedure number and the arguments. */ 1052 if ((!XDR_PUTINT32(xdrs, (int32_t *)&procnum)) || 1053 (!AUTH_MARSHALL(h->cl_auth, xdrs, p->cku_cred)) || 1054 (!(*xdr_args)(xdrs, argsp))) { 1055 p->cku_err.re_status = RPC_CANTENCODEARGS; 1056 p->cku_err.re_errno = EIO; 1057 goto cots_done; 1058 } 1059 1060 (*(uint32_t *)(mp->b_rptr)) = p->cku_xid; 1061 } else { 1062 uint32_t *uproc = (uint32_t *)&p->cku_rpchdr[WIRE_HDR_SIZE]; 1063 IXDR_PUT_U_INT32(uproc, procnum); 1064 1065 (*(uint32_t *)(&p->cku_rpchdr[0])) = p->cku_xid; 1066 1067 /* Use XDR_SETPOS() to set the b_wptr. */ 1068 XDR_SETPOS(xdrs, (uint_t)(mp->b_rptr - mp->b_datap->db_base)); 1069 1070 /* Serialize the procedure number and the arguments. */ 1071 if (!AUTH_WRAP(h->cl_auth, p->cku_rpchdr, WIRE_HDR_SIZE+4, 1072 xdrs, xdr_args, argsp)) { 1073 p->cku_err.re_status = RPC_CANTENCODEARGS; 1074 p->cku_err.re_errno = EIO; 1075 goto cots_done; 1076 } 1077 } 1078 1079 RPCLOG(2, "clnt_cots_kcallit: connected, sending call, tidu_size %d\n", 1080 tidu_size); 1081 1082 wq = cm_entry->x_wq; 1083 waitsecs = 0; 1084 1085 dispatch_again: 1086 status = clnt_dispatch_send(wq, mp, call, p->cku_xid, 1087 (p->cku_flags & CKU_ONQUEUE)); 1088 1089 if ((status == RPC_CANTSEND) && (call->call_reason == ENOBUFS)) { 1090 /* 1091 * QFULL condition, allow some time for queue to drain 1092 * and try again. Give up after waiting for all timeout 1093 * specified for the call, or zone is going away. 1094 */ 1095 max_waitsecs = wait.tv_sec ? wait.tv_sec : clnt_cots_min_tout; 1096 if ((waitsecs++ < max_waitsecs) && 1097 !(zone_status_get(curproc->p_zone) >= 1098 ZONE_IS_SHUTTING_DOWN)) { 1099 1100 /* wait 1 sec for queue to drain */ 1101 if (clnt_delay(drv_usectohz(1000000), 1102 h->cl_nosignal) == EINTR) { 1103 p->cku_err.re_errno = EINTR; 1104 p->cku_err.re_status = RPC_INTR; 1105 1106 goto cots_done; 1107 } 1108 1109 /* and try again */ 1110 goto dispatch_again; 1111 } 1112 p->cku_err.re_status = status; 1113 p->cku_err.re_errno = call->call_reason; 1114 DTRACE_PROBE(krpc__e__clntcots__kcallit__cantsend); 1115 1116 goto cots_done; 1117 } 1118 1119 if (waitsecs) { 1120 /* adjust timeout to account for time wait to send */ 1121 wait.tv_sec -= waitsecs; 1122 if (wait.tv_sec < 0) { 1123 /* pick up reply on next retry */ 1124 wait.tv_sec = 0; 1125 } 1126 DTRACE_PROBE2(clnt_cots__sendwait, CLIENT *, h, 1127 int, waitsecs); 1128 } 1129 1130 RPCLOG(64, "clnt_cots_kcallit: sent call for xid 0x%x\n", 1131 (uint_t)p->cku_xid); 1132 p->cku_flags = (CKU_ONQUEUE|CKU_SENT); 1133 p->cku_recv_attempts = 1; 1134 1135 #ifdef RPCDEBUG 1136 time_sent = lbolt; 1137 #endif 1138 1139 /* 1140 * Wait for a reply or a timeout. If there is no error or timeout, 1141 * (both indicated by call_status), call->call_reply will contain 1142 * the RPC reply message. 1143 */ 1144 read_again: 1145 mutex_enter(&call->call_lock); 1146 interrupted = 0; 1147 if (call->call_status == RPC_TIMEDOUT) { 1148 /* 1149 * Indicate that the lwp is not to be stopped while waiting 1150 * for this network traffic. This is to avoid deadlock while 1151 * debugging a process via /proc and also to avoid recursive 1152 * mutex_enter()s due to NFS page faults while stopping 1153 * (NFS holds locks when it calls here). 1154 */ 1155 clock_t cv_wait_ret; 1156 clock_t timout; 1157 clock_t oldlbolt; 1158 1159 klwp_t *lwp = ttolwp(curthread); 1160 1161 if (lwp != NULL) 1162 lwp->lwp_nostop++; 1163 1164 oldlbolt = lbolt; 1165 timout = wait.tv_sec * drv_usectohz(1000000) + 1166 drv_usectohz(wait.tv_usec) + oldlbolt; 1167 /* 1168 * Iterate until the call_status is changed to something 1169 * other that RPC_TIMEDOUT, or if cv_timedwait_sig() returns 1170 * something <=0 zero. The latter means that we timed 1171 * out. 1172 */ 1173 if (h->cl_nosignal) 1174 while ((cv_wait_ret = cv_timedwait(&call->call_cv, 1175 &call->call_lock, timout)) > 0 && 1176 call->call_status == RPC_TIMEDOUT) 1177 ; 1178 else 1179 while ((cv_wait_ret = cv_timedwait_sig( 1180 &call->call_cv, 1181 &call->call_lock, timout)) > 0 && 1182 call->call_status == RPC_TIMEDOUT) 1183 ; 1184 1185 switch (cv_wait_ret) { 1186 case 0: 1187 /* 1188 * If we got out of the above loop with 1189 * cv_timedwait_sig() returning 0, then we were 1190 * interrupted regardless what call_status is. 1191 */ 1192 interrupted = 1; 1193 break; 1194 case -1: 1195 /* cv_timedwait_sig() timed out */ 1196 break; 1197 default: 1198 1199 /* 1200 * We were cv_signaled(). If we didn't 1201 * get a successful call_status and returned 1202 * before time expired, delay up to clnt_cots_min_tout 1203 * seconds so that the caller doesn't immediately 1204 * try to call us again and thus force the 1205 * same condition that got us here (such 1206 * as a RPC_XPRTFAILED due to the server not 1207 * listening on the end-point. 1208 */ 1209 if (call->call_status != RPC_SUCCESS) { 1210 clock_t curlbolt; 1211 clock_t diff; 1212 1213 curlbolt = ddi_get_lbolt(); 1214 ticks = clnt_cots_min_tout * 1215 drv_usectohz(1000000); 1216 diff = curlbolt - oldlbolt; 1217 if (diff < ticks) { 1218 delay_first = TRUE; 1219 if (diff > 0) 1220 ticks -= diff; 1221 } 1222 } 1223 break; 1224 } 1225 1226 if (lwp != NULL) 1227 lwp->lwp_nostop--; 1228 } 1229 /* 1230 * Get the reply message, if any. This will be freed at the end 1231 * whether or not an error occurred. 1232 */ 1233 mp = call->call_reply; 1234 call->call_reply = NULL; 1235 1236 /* 1237 * call_err is the error info when the call is on dispatch queue. 1238 * cku_err is the error info returned to the caller. 1239 * Sync cku_err with call_err for local message processing. 1240 */ 1241 1242 status = call->call_status; 1243 p->cku_err = call->call_err; 1244 mutex_exit(&call->call_lock); 1245 1246 if (status != RPC_SUCCESS) { 1247 switch (status) { 1248 case RPC_TIMEDOUT: 1249 if (interrupted) { 1250 COTSRCSTAT_INCR(p->cku_stats, rcintrs); 1251 p->cku_err.re_status = RPC_INTR; 1252 p->cku_err.re_errno = EINTR; 1253 RPCLOG(1, "clnt_cots_kcallit: xid 0x%x", 1254 p->cku_xid); 1255 RPCLOG(1, "signal interrupted at %ld", lbolt); 1256 RPCLOG(1, ", was sent at %ld\n", time_sent); 1257 } else { 1258 COTSRCSTAT_INCR(p->cku_stats, rctimeouts); 1259 p->cku_err.re_errno = ETIMEDOUT; 1260 RPCLOG(1, "clnt_cots_kcallit: timed out at %ld", 1261 lbolt); 1262 RPCLOG(1, ", was sent at %ld\n", time_sent); 1263 } 1264 break; 1265 1266 case RPC_XPRTFAILED: 1267 if (p->cku_err.re_errno == 0) 1268 p->cku_err.re_errno = EIO; 1269 1270 RPCLOG(1, "clnt_cots_kcallit: transport failed: %d\n", 1271 p->cku_err.re_errno); 1272 break; 1273 1274 case RPC_SYSTEMERROR: 1275 ASSERT(p->cku_err.re_errno); 1276 RPCLOG(1, "clnt_cots_kcallit: system error: %d\n", 1277 p->cku_err.re_errno); 1278 break; 1279 1280 default: 1281 p->cku_err.re_status = RPC_SYSTEMERROR; 1282 p->cku_err.re_errno = EIO; 1283 RPCLOG(1, "clnt_cots_kcallit: error: %s\n", 1284 clnt_sperrno(status)); 1285 break; 1286 } 1287 if (p->cku_err.re_status != RPC_TIMEDOUT) { 1288 1289 if (p->cku_flags & CKU_ONQUEUE) { 1290 call_table_remove(call); 1291 p->cku_flags &= ~CKU_ONQUEUE; 1292 } 1293 1294 RPCLOG(64, "clnt_cots_kcallit: non TIMEOUT so xid 0x%x " 1295 "taken off dispatch list\n", p->cku_xid); 1296 if (call->call_reply) { 1297 freemsg(call->call_reply); 1298 call->call_reply = NULL; 1299 } 1300 } else if (wait.tv_sec != 0) { 1301 /* 1302 * We've sent the request over TCP and so we have 1303 * every reason to believe it will get 1304 * delivered. In which case returning a timeout is not 1305 * appropriate. 1306 */ 1307 if (p->cku_progress == TRUE && 1308 p->cku_recv_attempts < clnt_cots_maxrecv) { 1309 p->cku_err.re_status = RPC_INPROGRESS; 1310 } 1311 } 1312 goto cots_done; 1313 } 1314 1315 xdrs = &p->cku_inxdr; 1316 xdrmblk_init(xdrs, mp, XDR_DECODE, 0); 1317 1318 reply_msg.rm_direction = REPLY; 1319 reply_msg.rm_reply.rp_stat = MSG_ACCEPTED; 1320 reply_msg.acpted_rply.ar_stat = SUCCESS; 1321 1322 reply_msg.acpted_rply.ar_verf = _null_auth; 1323 /* 1324 * xdr_results will be done in AUTH_UNWRAP. 1325 */ 1326 reply_msg.acpted_rply.ar_results.where = NULL; 1327 reply_msg.acpted_rply.ar_results.proc = xdr_void; 1328 1329 if (xdr_replymsg(xdrs, &reply_msg)) { 1330 enum clnt_stat re_status; 1331 1332 _seterr_reply(&reply_msg, &p->cku_err); 1333 1334 re_status = p->cku_err.re_status; 1335 if (re_status == RPC_SUCCESS) { 1336 /* 1337 * Reply is good, check auth. 1338 */ 1339 if (!AUTH_VALIDATE(h->cl_auth, 1340 &reply_msg.acpted_rply.ar_verf)) { 1341 COTSRCSTAT_INCR(p->cku_stats, rcbadverfs); 1342 RPCLOG0(1, "clnt_cots_kcallit: validation " 1343 "failure\n"); 1344 freemsg(mp); 1345 (void) xdr_rpc_free_verifier(xdrs, &reply_msg); 1346 mutex_enter(&call->call_lock); 1347 if (call->call_reply == NULL) 1348 call->call_status = RPC_TIMEDOUT; 1349 mutex_exit(&call->call_lock); 1350 goto read_again; 1351 } else if (!AUTH_UNWRAP(h->cl_auth, xdrs, 1352 xdr_results, resultsp)) { 1353 RPCLOG0(1, "clnt_cots_kcallit: validation " 1354 "failure (unwrap)\n"); 1355 p->cku_err.re_status = RPC_CANTDECODERES; 1356 p->cku_err.re_errno = EIO; 1357 } 1358 } else { 1359 /* set errno in case we can't recover */ 1360 if (re_status != RPC_VERSMISMATCH && 1361 re_status != RPC_AUTHERROR && 1362 re_status != RPC_PROGVERSMISMATCH) 1363 p->cku_err.re_errno = EIO; 1364 1365 if (re_status == RPC_AUTHERROR) { 1366 /* 1367 * Maybe our credential need to be refreshed 1368 */ 1369 if (cm_entry) { 1370 /* 1371 * There is the potential that the 1372 * cm_entry has/will be marked dead, 1373 * so drop the connection altogether, 1374 * force REFRESH to establish new 1375 * connection. 1376 */ 1377 connmgr_cancelconn(cm_entry); 1378 cm_entry = NULL; 1379 } 1380 1381 if ((refreshes > 0) && 1382 AUTH_REFRESH(h->cl_auth, &reply_msg, 1383 p->cku_cred)) { 1384 refreshes--; 1385 (void) xdr_rpc_free_verifier(xdrs, 1386 &reply_msg); 1387 freemsg(mp); 1388 mp = NULL; 1389 1390 if (p->cku_flags & CKU_ONQUEUE) { 1391 call_table_remove(call); 1392 p->cku_flags &= ~CKU_ONQUEUE; 1393 } 1394 1395 RPCLOG(64, 1396 "clnt_cots_kcallit: AUTH_ERROR, xid" 1397 " 0x%x removed off dispatch list\n", 1398 p->cku_xid); 1399 if (call->call_reply) { 1400 freemsg(call->call_reply); 1401 call->call_reply = NULL; 1402 } 1403 1404 COTSRCSTAT_INCR(p->cku_stats, 1405 rcbadcalls); 1406 COTSRCSTAT_INCR(p->cku_stats, 1407 rcnewcreds); 1408 goto call_again; 1409 } 1410 1411 /* 1412 * We have used the client handle to 1413 * do an AUTH_REFRESH and the RPC status may 1414 * be set to RPC_SUCCESS; Let's make sure to 1415 * set it to RPC_AUTHERROR. 1416 */ 1417 p->cku_err.re_status = RPC_AUTHERROR; 1418 1419 /* 1420 * Map recoverable and unrecoverable 1421 * authentication errors to appropriate errno 1422 */ 1423 switch (p->cku_err.re_why) { 1424 case AUTH_TOOWEAK: 1425 /* 1426 * This could be a failure where the 1427 * server requires use of a reserved 1428 * port, check and optionally set the 1429 * client handle useresvport trying 1430 * one more time. Next go round we 1431 * fall out with the tooweak error. 1432 */ 1433 if (p->cku_useresvport != 1) { 1434 p->cku_useresvport = 1; 1435 p->cku_xid = 0; 1436 (void) xdr_rpc_free_verifier 1437 (xdrs, &reply_msg); 1438 freemsg(mp); 1439 goto call_again; 1440 } 1441 /* FALLTHRU */ 1442 case AUTH_BADCRED: 1443 case AUTH_BADVERF: 1444 case AUTH_INVALIDRESP: 1445 case AUTH_FAILED: 1446 case RPCSEC_GSS_NOCRED: 1447 case RPCSEC_GSS_FAILED: 1448 p->cku_err.re_errno = EACCES; 1449 break; 1450 case AUTH_REJECTEDCRED: 1451 case AUTH_REJECTEDVERF: 1452 default: p->cku_err.re_errno = EIO; 1453 break; 1454 } 1455 RPCLOG(1, "clnt_cots_kcallit : authentication" 1456 " failed with RPC_AUTHERROR of type %d\n", 1457 (int)p->cku_err.re_why); 1458 } 1459 } 1460 } else { 1461 /* reply didn't decode properly. */ 1462 p->cku_err.re_status = RPC_CANTDECODERES; 1463 p->cku_err.re_errno = EIO; 1464 RPCLOG0(1, "clnt_cots_kcallit: decode failure\n"); 1465 } 1466 1467 (void) xdr_rpc_free_verifier(xdrs, &reply_msg); 1468 1469 if (p->cku_flags & CKU_ONQUEUE) { 1470 call_table_remove(call); 1471 p->cku_flags &= ~CKU_ONQUEUE; 1472 } 1473 1474 RPCLOG(64, "clnt_cots_kcallit: xid 0x%x taken off dispatch list", 1475 p->cku_xid); 1476 RPCLOG(64, " status is %s\n", clnt_sperrno(p->cku_err.re_status)); 1477 cots_done: 1478 if (cm_entry) 1479 connmgr_release(cm_entry); 1480 1481 if (mp != NULL) 1482 freemsg(mp); 1483 if ((p->cku_flags & CKU_ONQUEUE) == 0 && call->call_reply) { 1484 freemsg(call->call_reply); 1485 call->call_reply = NULL; 1486 } 1487 if (p->cku_err.re_status != RPC_SUCCESS) { 1488 RPCLOG0(1, "clnt_cots_kcallit: tail-end failure\n"); 1489 COTSRCSTAT_INCR(p->cku_stats, rcbadcalls); 1490 } 1491 1492 /* 1493 * No point in delaying if the zone is going away. 1494 */ 1495 if (delay_first == TRUE && 1496 !(zone_status_get(curproc->p_zone) >= ZONE_IS_SHUTTING_DOWN)) { 1497 if (clnt_delay(ticks, h->cl_nosignal) == EINTR) { 1498 p->cku_err.re_errno = EINTR; 1499 p->cku_err.re_status = RPC_INTR; 1500 } 1501 } 1502 return (p->cku_err.re_status); 1503 } 1504 1505 /* 1506 * Kinit routine for cots. This sets up the correct operations in 1507 * the client handle, as the handle may have previously been a clts 1508 * handle, and clears the xid field so there is no way a new call 1509 * could be mistaken for a retry. It also sets in the handle the 1510 * information that is passed at create/kinit time but needed at 1511 * call time, as cots creates the transport at call time - device, 1512 * address of the server, protocol family. 1513 */ 1514 void 1515 clnt_cots_kinit(CLIENT *h, dev_t dev, int family, struct netbuf *addr, 1516 int max_msgsize, cred_t *cred) 1517 { 1518 /* LINTED pointer alignment */ 1519 cku_private_t *p = htop(h); 1520 calllist_t *call = &p->cku_call; 1521 1522 h->cl_ops = &tcp_ops; 1523 if (p->cku_flags & CKU_ONQUEUE) { 1524 call_table_remove(call); 1525 p->cku_flags &= ~CKU_ONQUEUE; 1526 RPCLOG(64, "clnt_cots_kinit: removing call for xid 0x%x from" 1527 " dispatch list\n", p->cku_xid); 1528 } 1529 1530 if (call->call_reply != NULL) { 1531 freemsg(call->call_reply); 1532 call->call_reply = NULL; 1533 } 1534 1535 call->call_bucket = NULL; 1536 call->call_hash = 0; 1537 1538 /* 1539 * We don't clear cku_flags here, because clnt_cots_kcallit() 1540 * takes care of handling the cku_flags reset. 1541 */ 1542 p->cku_xid = 0; 1543 p->cku_device = dev; 1544 p->cku_addrfmly = family; 1545 p->cku_cred = cred; 1546 1547 if (p->cku_addr.maxlen < addr->len) { 1548 if (p->cku_addr.maxlen != 0 && p->cku_addr.buf != NULL) 1549 kmem_free(p->cku_addr.buf, p->cku_addr.maxlen); 1550 p->cku_addr.buf = kmem_zalloc(addr->maxlen, KM_SLEEP); 1551 p->cku_addr.maxlen = addr->maxlen; 1552 } 1553 1554 p->cku_addr.len = addr->len; 1555 bcopy(addr->buf, p->cku_addr.buf, addr->len); 1556 1557 /* 1558 * If the current sanity check size in rpcmod is smaller 1559 * than the size needed, then increase the sanity check. 1560 */ 1561 if (max_msgsize != 0 && clnt_max_msg_sizep != NULL && 1562 max_msgsize > *clnt_max_msg_sizep) { 1563 mutex_enter(&clnt_max_msg_lock); 1564 if (max_msgsize > *clnt_max_msg_sizep) 1565 *clnt_max_msg_sizep = max_msgsize; 1566 mutex_exit(&clnt_max_msg_lock); 1567 } 1568 } 1569 1570 /* 1571 * ksettimers is a no-op for cots, with the exception of setting the xid. 1572 */ 1573 /* ARGSUSED */ 1574 static int 1575 clnt_cots_ksettimers(CLIENT *h, struct rpc_timers *t, struct rpc_timers *all, 1576 int minimum, void (*feedback)(int, int, caddr_t), caddr_t arg, 1577 uint32_t xid) 1578 { 1579 /* LINTED pointer alignment */ 1580 cku_private_t *p = htop(h); 1581 1582 if (xid) 1583 p->cku_xid = xid; 1584 COTSRCSTAT_INCR(p->cku_stats, rctimers); 1585 return (0); 1586 } 1587 1588 extern void rpc_poptimod(struct vnode *); 1589 extern int kstr_push(struct vnode *, char *); 1590 1591 int 1592 conn_kstat_update(kstat_t *ksp, int rw) 1593 { 1594 struct cm_xprt *cm_entry; 1595 struct cm_kstat_xprt *cm_ksp_data; 1596 uchar_t *b; 1597 char *fbuf; 1598 1599 if (rw == KSTAT_WRITE) 1600 return (EACCES); 1601 if (ksp == NULL || ksp->ks_private == NULL) 1602 return (EIO); 1603 cm_entry = (struct cm_xprt *)ksp->ks_private; 1604 cm_ksp_data = (struct cm_kstat_xprt *)ksp->ks_data; 1605 1606 cm_ksp_data->x_wq.value.ui32 = (uint32_t)(uintptr_t)cm_entry->x_wq; 1607 cm_ksp_data->x_family.value.ui32 = cm_entry->x_family; 1608 cm_ksp_data->x_rdev.value.ui32 = (uint32_t)cm_entry->x_rdev; 1609 cm_ksp_data->x_time.value.ui32 = cm_entry->x_time; 1610 cm_ksp_data->x_ref.value.ui32 = cm_entry->x_ref; 1611 cm_ksp_data->x_state.value.ui32 = cm_entry->x_state_flags; 1612 1613 if (cm_entry->x_server.buf) { 1614 fbuf = cm_ksp_data->x_server.value.str.addr.ptr; 1615 if (cm_entry->x_family == AF_INET && 1616 cm_entry->x_server.len == 1617 sizeof (struct sockaddr_in)) { 1618 struct sockaddr_in *sa; 1619 sa = (struct sockaddr_in *) 1620 cm_entry->x_server.buf; 1621 b = (uchar_t *)&sa->sin_addr; 1622 (void) sprintf(fbuf, 1623 "%03d.%03d.%03d.%03d", b[0] & 0xFF, b[1] & 0xFF, 1624 b[2] & 0xFF, b[3] & 0xFF); 1625 cm_ksp_data->x_port.value.ui32 = 1626 (uint32_t)sa->sin_port; 1627 } else if (cm_entry->x_family == AF_INET6 && 1628 cm_entry->x_server.len >= 1629 sizeof (struct sockaddr_in6)) { 1630 /* extract server IP address & port */ 1631 struct sockaddr_in6 *sin6; 1632 sin6 = (struct sockaddr_in6 *)cm_entry->x_server.buf; 1633 (void) kinet_ntop6((uchar_t *)&sin6->sin6_addr, fbuf, 1634 INET6_ADDRSTRLEN); 1635 cm_ksp_data->x_port.value.ui32 = sin6->sin6_port; 1636 } else { 1637 struct sockaddr_in *sa; 1638 1639 sa = (struct sockaddr_in *)cm_entry->x_server.buf; 1640 b = (uchar_t *)&sa->sin_addr; 1641 (void) sprintf(fbuf, 1642 "%03d.%03d.%03d.%03d", b[0] & 0xFF, b[1] & 0xFF, 1643 b[2] & 0xFF, b[3] & 0xFF); 1644 } 1645 KSTAT_NAMED_STR_BUFLEN(&cm_ksp_data->x_server) = 1646 strlen(fbuf) + 1; 1647 } 1648 1649 return (0); 1650 } 1651 1652 1653 /* 1654 * We want a version of delay which is interruptible by a UNIX signal 1655 * Return EINTR if an interrupt occured. 1656 */ 1657 static int 1658 clnt_delay(clock_t ticks, bool_t nosignal) 1659 { 1660 if (nosignal == TRUE) { 1661 delay(ticks); 1662 return (0); 1663 } 1664 return (delay_sig(ticks)); 1665 } 1666 1667 /* 1668 * Wait for a connection until a timeout, or until we are 1669 * signalled that there has been a connection state change. 1670 */ 1671 static enum clnt_stat 1672 connmgr_cwait(struct cm_xprt *cm_entry, const struct timeval *waitp, 1673 bool_t nosignal) 1674 { 1675 bool_t interrupted; 1676 clock_t timout, cv_stat; 1677 enum clnt_stat clstat; 1678 unsigned int old_state; 1679 1680 ASSERT(MUTEX_HELD(&connmgr_lock)); 1681 /* 1682 * We wait for the transport connection to be made, or an 1683 * indication that it could not be made. 1684 */ 1685 clstat = RPC_TIMEDOUT; 1686 interrupted = FALSE; 1687 1688 old_state = cm_entry->x_state_flags; 1689 /* 1690 * Now loop until cv_timedwait{_sig} returns because of 1691 * a signal(0) or timeout(-1) or cv_signal(>0). But it may be 1692 * cv_signalled for various other reasons too. So loop 1693 * until there is a state change on the connection. 1694 */ 1695 1696 timout = waitp->tv_sec * drv_usectohz(1000000) + 1697 drv_usectohz(waitp->tv_usec) + lbolt; 1698 1699 if (nosignal) { 1700 while ((cv_stat = cv_timedwait(&cm_entry->x_conn_cv, 1701 &connmgr_lock, timout)) > 0 && 1702 cm_entry->x_state_flags == old_state) 1703 ; 1704 } else { 1705 while ((cv_stat = cv_timedwait_sig(&cm_entry->x_conn_cv, 1706 &connmgr_lock, timout)) > 0 && 1707 cm_entry->x_state_flags == old_state) 1708 ; 1709 1710 if (cv_stat == 0) /* got intr signal? */ 1711 interrupted = TRUE; 1712 } 1713 1714 if ((cm_entry->x_state_flags & (X_BADSTATES|X_CONNECTED)) == 1715 X_CONNECTED) { 1716 clstat = RPC_SUCCESS; 1717 } else { 1718 if (interrupted == TRUE) 1719 clstat = RPC_INTR; 1720 RPCLOG(1, "connmgr_cwait: can't connect, error: %s\n", 1721 clnt_sperrno(clstat)); 1722 } 1723 1724 return (clstat); 1725 } 1726 1727 /* 1728 * Primary interface for how RPC grabs a connection. 1729 */ 1730 static struct cm_xprt * 1731 connmgr_wrapget( 1732 struct netbuf *retryaddr, 1733 const struct timeval *waitp, 1734 cku_private_t *p) 1735 { 1736 struct cm_xprt *cm_entry; 1737 1738 cm_entry = connmgr_get(retryaddr, waitp, &p->cku_addr, p->cku_addrfmly, 1739 &p->cku_srcaddr, &p->cku_err, p->cku_device, 1740 p->cku_client.cl_nosignal, p->cku_useresvport, p->cku_cred); 1741 1742 if (cm_entry == NULL) { 1743 /* 1744 * Re-map the call status to RPC_INTR if the err code is 1745 * EINTR. This can happen if calls status is RPC_TLIERROR. 1746 * However, don't re-map if signalling has been turned off. 1747 * XXX Really need to create a separate thread whenever 1748 * there isn't an existing connection. 1749 */ 1750 if (p->cku_err.re_errno == EINTR) { 1751 if (p->cku_client.cl_nosignal == TRUE) 1752 p->cku_err.re_errno = EIO; 1753 else 1754 p->cku_err.re_status = RPC_INTR; 1755 } 1756 } 1757 1758 return (cm_entry); 1759 } 1760 1761 /* 1762 * Obtains a transport to the server specified in addr. If a suitable transport 1763 * does not already exist in the list of cached transports, a new connection 1764 * is created, connected, and added to the list. The connection is for sending 1765 * only - the reply message may come back on another transport connection. 1766 */ 1767 static struct cm_xprt * 1768 connmgr_get( 1769 struct netbuf *retryaddr, 1770 const struct timeval *waitp, /* changed to a ptr to converse stack */ 1771 struct netbuf *destaddr, 1772 int addrfmly, 1773 struct netbuf *srcaddr, 1774 struct rpc_err *rpcerr, 1775 dev_t device, 1776 bool_t nosignal, 1777 int useresvport, 1778 cred_t *cr) 1779 { 1780 struct cm_xprt *cm_entry; 1781 struct cm_xprt *lru_entry; 1782 struct cm_xprt **cmp; 1783 queue_t *wq; 1784 TIUSER *tiptr; 1785 int i; 1786 int retval; 1787 clock_t prev_time; 1788 int tidu_size; 1789 bool_t connected; 1790 zoneid_t zoneid = rpc_zoneid(); 1791 1792 /* 1793 * If the call is not a retry, look for a transport entry that 1794 * goes to the server of interest. 1795 */ 1796 mutex_enter(&connmgr_lock); 1797 1798 if (retryaddr == NULL) { 1799 use_new_conn: 1800 i = 0; 1801 cm_entry = lru_entry = NULL; 1802 prev_time = lbolt; 1803 1804 cmp = &cm_hd; 1805 while ((cm_entry = *cmp) != NULL) { 1806 ASSERT(cm_entry != cm_entry->x_next); 1807 /* 1808 * Garbage collect conections that are marked 1809 * for needs disconnect. 1810 */ 1811 if (cm_entry->x_needdis) { 1812 CONN_HOLD(cm_entry); 1813 connmgr_dis_and_wait(cm_entry); 1814 connmgr_release(cm_entry); 1815 /* 1816 * connmgr_lock could have been 1817 * dropped for the disconnect 1818 * processing so start over. 1819 */ 1820 goto use_new_conn; 1821 } 1822 1823 /* 1824 * Garbage collect the dead connections that have 1825 * no threads working on them. 1826 */ 1827 if ((cm_entry->x_state_flags & (X_DEAD|X_THREAD)) == 1828 X_DEAD) { 1829 mutex_enter(&cm_entry->x_lock); 1830 if (cm_entry->x_ref != 0) { 1831 /* 1832 * Currently in use. 1833 * Cleanup later. 1834 */ 1835 cmp = &cm_entry->x_next; 1836 mutex_exit(&cm_entry->x_lock); 1837 continue; 1838 } 1839 mutex_exit(&cm_entry->x_lock); 1840 *cmp = cm_entry->x_next; 1841 mutex_exit(&connmgr_lock); 1842 connmgr_close(cm_entry); 1843 mutex_enter(&connmgr_lock); 1844 goto use_new_conn; 1845 } 1846 1847 1848 if ((cm_entry->x_state_flags & X_BADSTATES) == 0 && 1849 cm_entry->x_zoneid == zoneid && 1850 cm_entry->x_rdev == device && 1851 destaddr->len == cm_entry->x_server.len && 1852 bcmp(destaddr->buf, cm_entry->x_server.buf, 1853 destaddr->len) == 0) { 1854 /* 1855 * If the matching entry isn't connected, 1856 * attempt to reconnect it. 1857 */ 1858 if (cm_entry->x_connected == FALSE) { 1859 /* 1860 * We don't go through trying 1861 * to find the least recently 1862 * used connected because 1863 * connmgr_reconnect() briefly 1864 * dropped the connmgr_lock, 1865 * allowing a window for our 1866 * accounting to be messed up. 1867 * In any case, a re-connected 1868 * connection is as good as 1869 * a LRU connection. 1870 */ 1871 return (connmgr_wrapconnect(cm_entry, 1872 waitp, destaddr, addrfmly, srcaddr, 1873 rpcerr, TRUE, nosignal, cr)); 1874 } 1875 i++; 1876 if (cm_entry->x_time - prev_time <= 0 || 1877 lru_entry == NULL) { 1878 prev_time = cm_entry->x_time; 1879 lru_entry = cm_entry; 1880 } 1881 } 1882 cmp = &cm_entry->x_next; 1883 } 1884 1885 if (i > clnt_max_conns) { 1886 RPCLOG(8, "connmgr_get: too many conns, dooming entry" 1887 " %p\n", (void *)lru_entry->x_tiptr); 1888 lru_entry->x_doomed = TRUE; 1889 goto use_new_conn; 1890 } 1891 1892 /* 1893 * If we are at the maximum number of connections to 1894 * the server, hand back the least recently used one. 1895 */ 1896 if (i == clnt_max_conns) { 1897 /* 1898 * Copy into the handle the source address of 1899 * the connection, which we will use in case of 1900 * a later retry. 1901 */ 1902 if (srcaddr->len != lru_entry->x_src.len) { 1903 if (srcaddr->len > 0) 1904 kmem_free(srcaddr->buf, 1905 srcaddr->maxlen); 1906 srcaddr->buf = kmem_zalloc( 1907 lru_entry->x_src.len, KM_SLEEP); 1908 srcaddr->maxlen = srcaddr->len = 1909 lru_entry->x_src.len; 1910 } 1911 bcopy(lru_entry->x_src.buf, srcaddr->buf, srcaddr->len); 1912 RPCLOG(2, "connmgr_get: call going out on %p\n", 1913 (void *)lru_entry); 1914 lru_entry->x_time = lbolt; 1915 CONN_HOLD(lru_entry); 1916 mutex_exit(&connmgr_lock); 1917 return (lru_entry); 1918 } 1919 1920 } else { 1921 /* 1922 * This is the retry case (retryaddr != NULL). Retries must 1923 * be sent on the same source port as the original call. 1924 */ 1925 1926 /* 1927 * Walk the list looking for a connection with a source address 1928 * that matches the retry address. 1929 */ 1930 start_retry_loop: 1931 cmp = &cm_hd; 1932 while ((cm_entry = *cmp) != NULL) { 1933 ASSERT(cm_entry != cm_entry->x_next); 1934 1935 /* 1936 * determine if this connection matches the passed 1937 * in retry address. If it does not match, advance 1938 * to the next element on the list. 1939 */ 1940 if (zoneid != cm_entry->x_zoneid || 1941 device != cm_entry->x_rdev || 1942 retryaddr->len != cm_entry->x_src.len || 1943 bcmp(retryaddr->buf, cm_entry->x_src.buf, 1944 retryaddr->len) != 0) { 1945 cmp = &cm_entry->x_next; 1946 continue; 1947 } 1948 /* 1949 * Garbage collect conections that are marked 1950 * for needs disconnect. 1951 */ 1952 if (cm_entry->x_needdis) { 1953 CONN_HOLD(cm_entry); 1954 connmgr_dis_and_wait(cm_entry); 1955 connmgr_release(cm_entry); 1956 /* 1957 * connmgr_lock could have been 1958 * dropped for the disconnect 1959 * processing so start over. 1960 */ 1961 goto start_retry_loop; 1962 } 1963 /* 1964 * Garbage collect the dead connections that have 1965 * no threads working on them. 1966 */ 1967 if ((cm_entry->x_state_flags & (X_DEAD|X_THREAD)) == 1968 X_DEAD) { 1969 mutex_enter(&cm_entry->x_lock); 1970 if (cm_entry->x_ref != 0) { 1971 /* 1972 * Currently in use. 1973 * Cleanup later. 1974 */ 1975 cmp = &cm_entry->x_next; 1976 mutex_exit(&cm_entry->x_lock); 1977 continue; 1978 } 1979 mutex_exit(&cm_entry->x_lock); 1980 *cmp = cm_entry->x_next; 1981 mutex_exit(&connmgr_lock); 1982 connmgr_close(cm_entry); 1983 mutex_enter(&connmgr_lock); 1984 goto start_retry_loop; 1985 } 1986 1987 /* 1988 * Sanity check: if the connection with our source 1989 * port is going to some other server, something went 1990 * wrong, as we never delete connections (i.e. release 1991 * ports) unless they have been idle. In this case, 1992 * it is probably better to send the call out using 1993 * a new source address than to fail it altogether, 1994 * since that port may never be released. 1995 */ 1996 if (destaddr->len != cm_entry->x_server.len || 1997 bcmp(destaddr->buf, cm_entry->x_server.buf, 1998 destaddr->len) != 0) { 1999 RPCLOG(1, "connmgr_get: tiptr %p" 2000 " is going to a different server" 2001 " with the port that belongs" 2002 " to us!\n", (void *)cm_entry->x_tiptr); 2003 retryaddr = NULL; 2004 goto use_new_conn; 2005 } 2006 2007 /* 2008 * If the connection of interest is not connected and we 2009 * can't reconnect it, then the server is probably 2010 * still down. Return NULL to the caller and let it 2011 * retry later if it wants to. We have a delay so the 2012 * machine doesn't go into a tight retry loop. If the 2013 * entry was already connected, or the reconnected was 2014 * successful, return this entry. 2015 */ 2016 if (cm_entry->x_connected == FALSE) { 2017 return (connmgr_wrapconnect(cm_entry, 2018 waitp, destaddr, addrfmly, NULL, 2019 rpcerr, TRUE, nosignal, cr)); 2020 } else { 2021 CONN_HOLD(cm_entry); 2022 2023 cm_entry->x_time = lbolt; 2024 mutex_exit(&connmgr_lock); 2025 RPCLOG(2, "connmgr_get: found old " 2026 "transport %p for retry\n", 2027 (void *)cm_entry); 2028 return (cm_entry); 2029 } 2030 } 2031 2032 /* 2033 * We cannot find an entry in the list for this retry. 2034 * Either the entry has been removed temporarily to be 2035 * reconnected by another thread, or the original call 2036 * got a port but never got connected, 2037 * and hence the transport never got put in the 2038 * list. Fall through to the "create new connection" code - 2039 * the former case will fail there trying to rebind the port, 2040 * and the later case (and any other pathological cases) will 2041 * rebind and reconnect and not hang the client machine. 2042 */ 2043 RPCLOG0(8, "connmgr_get: no entry in list for retry\n"); 2044 } 2045 /* 2046 * Set up a transport entry in the connection manager's list. 2047 */ 2048 cm_entry = (struct cm_xprt *) 2049 kmem_zalloc(sizeof (struct cm_xprt), KM_SLEEP); 2050 2051 cm_entry->x_server.buf = kmem_zalloc(destaddr->len, KM_SLEEP); 2052 bcopy(destaddr->buf, cm_entry->x_server.buf, destaddr->len); 2053 cm_entry->x_server.len = cm_entry->x_server.maxlen = destaddr->len; 2054 2055 cm_entry->x_state_flags = X_THREAD; 2056 cm_entry->x_ref = 1; 2057 cm_entry->x_family = addrfmly; 2058 cm_entry->x_rdev = device; 2059 cm_entry->x_zoneid = zoneid; 2060 mutex_init(&cm_entry->x_lock, NULL, MUTEX_DEFAULT, NULL); 2061 cv_init(&cm_entry->x_cv, NULL, CV_DEFAULT, NULL); 2062 cv_init(&cm_entry->x_conn_cv, NULL, CV_DEFAULT, NULL); 2063 cv_init(&cm_entry->x_dis_cv, NULL, CV_DEFAULT, NULL); 2064 2065 /* 2066 * Note that we add this partially initialized entry to the 2067 * connection list. This is so that we don't have connections to 2068 * the same server. 2069 * 2070 * Note that x_src is not initialized at this point. This is because 2071 * retryaddr might be NULL in which case x_src is whatever 2072 * t_kbind/bindresvport gives us. If another thread wants a 2073 * connection to the same server, seemingly we have an issue, but we 2074 * don't. If the other thread comes in with retryaddr == NULL, then it 2075 * will never look at x_src, and it will end up waiting in 2076 * connmgr_cwait() for the first thread to finish the connection 2077 * attempt. If the other thread comes in with retryaddr != NULL, then 2078 * that means there was a request sent on a connection, in which case 2079 * the the connection should already exist. Thus the first thread 2080 * never gets here ... it finds the connection it its server in the 2081 * connection list. 2082 * 2083 * But even if theory is wrong, in the retryaddr != NULL case, the 2nd 2084 * thread will skip us because x_src.len == 0. 2085 */ 2086 cm_entry->x_next = cm_hd; 2087 cm_hd = cm_entry; 2088 mutex_exit(&connmgr_lock); 2089 2090 /* 2091 * Either we didn't find an entry to the server of interest, or we 2092 * don't have the maximum number of connections to that server - 2093 * create a new connection. 2094 */ 2095 RPCLOG0(8, "connmgr_get: creating new connection\n"); 2096 rpcerr->re_status = RPC_TLIERROR; 2097 2098 i = t_kopen(NULL, device, FREAD|FWRITE|FNDELAY, &tiptr, zone_kcred()); 2099 if (i) { 2100 RPCLOG(1, "connmgr_get: can't open cots device, error %d\n", i); 2101 rpcerr->re_errno = i; 2102 connmgr_cancelconn(cm_entry); 2103 return (NULL); 2104 } 2105 rpc_poptimod(tiptr->fp->f_vnode); 2106 2107 if (i = strioctl(tiptr->fp->f_vnode, I_PUSH, (intptr_t)"rpcmod", 0, 2108 K_TO_K, kcred, &retval)) { 2109 RPCLOG(1, "connmgr_get: can't push cots module, %d\n", i); 2110 (void) t_kclose(tiptr, 1); 2111 rpcerr->re_errno = i; 2112 connmgr_cancelconn(cm_entry); 2113 return (NULL); 2114 } 2115 2116 if (i = strioctl(tiptr->fp->f_vnode, RPC_CLIENT, 0, 0, K_TO_K, 2117 kcred, &retval)) { 2118 RPCLOG(1, "connmgr_get: can't set client status with cots " 2119 "module, %d\n", i); 2120 (void) t_kclose(tiptr, 1); 2121 rpcerr->re_errno = i; 2122 connmgr_cancelconn(cm_entry); 2123 return (NULL); 2124 } 2125 2126 mutex_enter(&connmgr_lock); 2127 2128 wq = tiptr->fp->f_vnode->v_stream->sd_wrq->q_next; 2129 cm_entry->x_wq = wq; 2130 2131 mutex_exit(&connmgr_lock); 2132 2133 if (i = strioctl(tiptr->fp->f_vnode, I_PUSH, (intptr_t)"timod", 0, 2134 K_TO_K, kcred, &retval)) { 2135 RPCLOG(1, "connmgr_get: can't push timod, %d\n", i); 2136 (void) t_kclose(tiptr, 1); 2137 rpcerr->re_errno = i; 2138 connmgr_cancelconn(cm_entry); 2139 return (NULL); 2140 } 2141 2142 /* 2143 * If the caller has not specified reserved port usage then 2144 * take the system default. 2145 */ 2146 if (useresvport == -1) 2147 useresvport = clnt_cots_do_bindresvport; 2148 2149 if ((useresvport || retryaddr != NULL) && 2150 (addrfmly == AF_INET || addrfmly == AF_INET6)) { 2151 bool_t alloc_src = FALSE; 2152 2153 if (srcaddr->len != destaddr->len) { 2154 kmem_free(srcaddr->buf, srcaddr->maxlen); 2155 srcaddr->buf = kmem_zalloc(destaddr->len, KM_SLEEP); 2156 srcaddr->maxlen = destaddr->len; 2157 srcaddr->len = destaddr->len; 2158 alloc_src = TRUE; 2159 } 2160 2161 if ((i = bindresvport(tiptr, retryaddr, srcaddr, TRUE)) != 0) { 2162 (void) t_kclose(tiptr, 1); 2163 RPCLOG(1, "connmgr_get: couldn't bind, retryaddr: " 2164 "%p\n", (void *)retryaddr); 2165 2166 /* 2167 * 1225408: If we allocated a source address, then it 2168 * is either garbage or all zeroes. In that case 2169 * we need to clear srcaddr. 2170 */ 2171 if (alloc_src == TRUE) { 2172 kmem_free(srcaddr->buf, srcaddr->maxlen); 2173 srcaddr->maxlen = srcaddr->len = 0; 2174 srcaddr->buf = NULL; 2175 } 2176 rpcerr->re_errno = i; 2177 connmgr_cancelconn(cm_entry); 2178 return (NULL); 2179 } 2180 } else { 2181 if ((i = t_kbind(tiptr, NULL, NULL)) != 0) { 2182 RPCLOG(1, "clnt_cots_kcreate: t_kbind: %d\n", i); 2183 (void) t_kclose(tiptr, 1); 2184 rpcerr->re_errno = i; 2185 connmgr_cancelconn(cm_entry); 2186 return (NULL); 2187 } 2188 } 2189 2190 { 2191 /* 2192 * Keep the kernel stack lean. Don't move this call 2193 * declaration to the top of this function because a 2194 * call is declared in connmgr_wrapconnect() 2195 */ 2196 calllist_t call; 2197 2198 bzero(&call, sizeof (call)); 2199 cv_init(&call.call_cv, NULL, CV_DEFAULT, NULL); 2200 2201 /* 2202 * This is a bound end-point so don't close it's stream. 2203 */ 2204 connected = connmgr_connect(cm_entry, wq, destaddr, addrfmly, 2205 &call, &tidu_size, FALSE, waitp, nosignal, cr); 2206 *rpcerr = call.call_err; 2207 cv_destroy(&call.call_cv); 2208 2209 } 2210 2211 mutex_enter(&connmgr_lock); 2212 2213 /* 2214 * Set up a transport entry in the connection manager's list. 2215 */ 2216 cm_entry->x_src.buf = kmem_zalloc(srcaddr->len, KM_SLEEP); 2217 bcopy(srcaddr->buf, cm_entry->x_src.buf, srcaddr->len); 2218 cm_entry->x_src.len = cm_entry->x_src.maxlen = srcaddr->len; 2219 2220 cm_entry->x_tiptr = tiptr; 2221 cm_entry->x_time = lbolt; 2222 2223 if (tiptr->tp_info.servtype == T_COTS_ORD) 2224 cm_entry->x_ordrel = TRUE; 2225 else 2226 cm_entry->x_ordrel = FALSE; 2227 2228 cm_entry->x_tidu_size = tidu_size; 2229 2230 if (cm_entry->x_early_disc) { 2231 /* 2232 * We need to check if a disconnect request has come 2233 * while we are connected, if so, then we need to 2234 * set rpcerr->re_status appropriately before returning 2235 * NULL to caller. 2236 */ 2237 if (rpcerr->re_status == RPC_SUCCESS) 2238 rpcerr->re_status = RPC_XPRTFAILED; 2239 cm_entry->x_connected = FALSE; 2240 } else 2241 cm_entry->x_connected = connected; 2242 2243 /* 2244 * There could be a discrepancy here such that 2245 * x_early_disc is TRUE yet connected is TRUE as well 2246 * and the connection is actually connected. In that case 2247 * lets be conservative and declare the connection as not 2248 * connected. 2249 */ 2250 cm_entry->x_early_disc = FALSE; 2251 cm_entry->x_needdis = (cm_entry->x_connected == FALSE); 2252 cm_entry->x_ctime = lbolt; 2253 2254 /* 2255 * Notify any threads waiting that the connection attempt is done. 2256 */ 2257 cm_entry->x_thread = FALSE; 2258 cv_broadcast(&cm_entry->x_conn_cv); 2259 2260 if (cm_entry->x_connected == FALSE) { 2261 mutex_exit(&connmgr_lock); 2262 connmgr_release(cm_entry); 2263 return (NULL); 2264 } 2265 2266 mutex_exit(&connmgr_lock); 2267 2268 return (cm_entry); 2269 } 2270 2271 /* 2272 * Keep the cm_xprt entry on the connecton list when making a connection. This 2273 * is to prevent multiple connections to a slow server from appearing. 2274 * We use the bit field x_thread to tell if a thread is doing a connection 2275 * which keeps other interested threads from messing with connection. 2276 * Those other threads just wait if x_thread is set. 2277 * 2278 * If x_thread is not set, then we do the actual work of connecting via 2279 * connmgr_connect(). 2280 * 2281 * mutex convention: called with connmgr_lock held, returns with it released. 2282 */ 2283 static struct cm_xprt * 2284 connmgr_wrapconnect( 2285 struct cm_xprt *cm_entry, 2286 const struct timeval *waitp, 2287 struct netbuf *destaddr, 2288 int addrfmly, 2289 struct netbuf *srcaddr, 2290 struct rpc_err *rpcerr, 2291 bool_t reconnect, 2292 bool_t nosignal, 2293 cred_t *cr) 2294 { 2295 ASSERT(MUTEX_HELD(&connmgr_lock)); 2296 /* 2297 * Hold this entry as we are about to drop connmgr_lock. 2298 */ 2299 CONN_HOLD(cm_entry); 2300 2301 /* 2302 * If there is a thread already making a connection for us, then 2303 * wait for it to complete the connection. 2304 */ 2305 if (cm_entry->x_thread == TRUE) { 2306 rpcerr->re_status = connmgr_cwait(cm_entry, waitp, nosignal); 2307 2308 if (rpcerr->re_status != RPC_SUCCESS) { 2309 mutex_exit(&connmgr_lock); 2310 connmgr_release(cm_entry); 2311 return (NULL); 2312 } 2313 } else { 2314 bool_t connected; 2315 calllist_t call; 2316 2317 cm_entry->x_thread = TRUE; 2318 2319 while (cm_entry->x_needrel == TRUE) { 2320 cm_entry->x_needrel = FALSE; 2321 2322 connmgr_sndrel(cm_entry); 2323 delay(drv_usectohz(1000000)); 2324 2325 mutex_enter(&connmgr_lock); 2326 } 2327 2328 /* 2329 * If we need to send a T_DISCON_REQ, send one. 2330 */ 2331 connmgr_dis_and_wait(cm_entry); 2332 2333 mutex_exit(&connmgr_lock); 2334 2335 bzero(&call, sizeof (call)); 2336 cv_init(&call.call_cv, NULL, CV_DEFAULT, NULL); 2337 2338 connected = connmgr_connect(cm_entry, cm_entry->x_wq, 2339 destaddr, addrfmly, &call, &cm_entry->x_tidu_size, 2340 reconnect, waitp, nosignal, cr); 2341 2342 *rpcerr = call.call_err; 2343 cv_destroy(&call.call_cv); 2344 2345 mutex_enter(&connmgr_lock); 2346 2347 2348 if (cm_entry->x_early_disc) { 2349 /* 2350 * We need to check if a disconnect request has come 2351 * while we are connected, if so, then we need to 2352 * set rpcerr->re_status appropriately before returning 2353 * NULL to caller. 2354 */ 2355 if (rpcerr->re_status == RPC_SUCCESS) 2356 rpcerr->re_status = RPC_XPRTFAILED; 2357 cm_entry->x_connected = FALSE; 2358 } else 2359 cm_entry->x_connected = connected; 2360 2361 /* 2362 * There could be a discrepancy here such that 2363 * x_early_disc is TRUE yet connected is TRUE as well 2364 * and the connection is actually connected. In that case 2365 * lets be conservative and declare the connection as not 2366 * connected. 2367 */ 2368 2369 cm_entry->x_early_disc = FALSE; 2370 cm_entry->x_needdis = (cm_entry->x_connected == FALSE); 2371 2372 2373 /* 2374 * connmgr_connect() may have given up before the connection 2375 * actually timed out. So ensure that before the next 2376 * connection attempt we do a disconnect. 2377 */ 2378 cm_entry->x_ctime = lbolt; 2379 cm_entry->x_thread = FALSE; 2380 2381 cv_broadcast(&cm_entry->x_conn_cv); 2382 2383 if (cm_entry->x_connected == FALSE) { 2384 mutex_exit(&connmgr_lock); 2385 connmgr_release(cm_entry); 2386 return (NULL); 2387 } 2388 } 2389 2390 if (srcaddr != NULL) { 2391 /* 2392 * Copy into the handle the 2393 * source address of the 2394 * connection, which we will use 2395 * in case of a later retry. 2396 */ 2397 if (srcaddr->len != cm_entry->x_src.len) { 2398 if (srcaddr->maxlen > 0) 2399 kmem_free(srcaddr->buf, srcaddr->maxlen); 2400 srcaddr->buf = kmem_zalloc(cm_entry->x_src.len, 2401 KM_SLEEP); 2402 srcaddr->maxlen = srcaddr->len = 2403 cm_entry->x_src.len; 2404 } 2405 bcopy(cm_entry->x_src.buf, srcaddr->buf, srcaddr->len); 2406 } 2407 cm_entry->x_time = lbolt; 2408 mutex_exit(&connmgr_lock); 2409 return (cm_entry); 2410 } 2411 2412 /* 2413 * If we need to send a T_DISCON_REQ, send one. 2414 */ 2415 static void 2416 connmgr_dis_and_wait(struct cm_xprt *cm_entry) 2417 { 2418 ASSERT(MUTEX_HELD(&connmgr_lock)); 2419 for (;;) { 2420 while (cm_entry->x_needdis == TRUE) { 2421 RPCLOG(8, "connmgr_dis_and_wait: need " 2422 "T_DISCON_REQ for connection 0x%p\n", 2423 (void *)cm_entry); 2424 cm_entry->x_needdis = FALSE; 2425 cm_entry->x_waitdis = TRUE; 2426 2427 connmgr_snddis(cm_entry); 2428 2429 mutex_enter(&connmgr_lock); 2430 } 2431 2432 if (cm_entry->x_waitdis == TRUE) { 2433 clock_t curlbolt; 2434 clock_t timout; 2435 2436 RPCLOG(8, "connmgr_dis_and_wait waiting for " 2437 "T_DISCON_REQ's ACK for connection %p\n", 2438 (void *)cm_entry); 2439 curlbolt = ddi_get_lbolt(); 2440 2441 timout = clnt_cots_min_conntout * 2442 drv_usectohz(1000000) + curlbolt; 2443 2444 /* 2445 * The TPI spec says that the T_DISCON_REQ 2446 * will get acknowledged, but in practice 2447 * the ACK may never get sent. So don't 2448 * block forever. 2449 */ 2450 (void) cv_timedwait(&cm_entry->x_dis_cv, 2451 &connmgr_lock, timout); 2452 } 2453 /* 2454 * If we got the ACK, break. If we didn't, 2455 * then send another T_DISCON_REQ. 2456 */ 2457 if (cm_entry->x_waitdis == FALSE) { 2458 break; 2459 } else { 2460 RPCLOG(8, "connmgr_dis_and_wait: did" 2461 "not get T_DISCON_REQ's ACK for " 2462 "connection %p\n", (void *)cm_entry); 2463 cm_entry->x_needdis = TRUE; 2464 } 2465 } 2466 } 2467 2468 static void 2469 connmgr_cancelconn(struct cm_xprt *cm_entry) 2470 { 2471 /* 2472 * Mark the connection table entry as dead; the next thread that 2473 * goes through connmgr_release() will notice this and deal with it. 2474 */ 2475 mutex_enter(&connmgr_lock); 2476 cm_entry->x_dead = TRUE; 2477 2478 /* 2479 * Notify any threads waiting for the connection that it isn't 2480 * going to happen. 2481 */ 2482 cm_entry->x_thread = FALSE; 2483 cv_broadcast(&cm_entry->x_conn_cv); 2484 mutex_exit(&connmgr_lock); 2485 2486 connmgr_release(cm_entry); 2487 } 2488 2489 static void 2490 connmgr_close(struct cm_xprt *cm_entry) 2491 { 2492 mutex_enter(&cm_entry->x_lock); 2493 while (cm_entry->x_ref != 0) { 2494 /* 2495 * Must be a noninterruptible wait. 2496 */ 2497 cv_wait(&cm_entry->x_cv, &cm_entry->x_lock); 2498 } 2499 2500 if (cm_entry->x_tiptr != NULL) 2501 (void) t_kclose(cm_entry->x_tiptr, 1); 2502 2503 mutex_exit(&cm_entry->x_lock); 2504 if (cm_entry->x_ksp != NULL) { 2505 mutex_enter(&connmgr_lock); 2506 cm_entry->x_ksp->ks_private = NULL; 2507 mutex_exit(&connmgr_lock); 2508 2509 /* 2510 * Must free the buffer we allocated for the 2511 * server address in the update function 2512 */ 2513 if (((struct cm_kstat_xprt *)(cm_entry->x_ksp->ks_data))-> 2514 x_server.value.str.addr.ptr != NULL) 2515 kmem_free(((struct cm_kstat_xprt *)(cm_entry->x_ksp-> 2516 ks_data))->x_server.value.str.addr.ptr, 2517 INET6_ADDRSTRLEN); 2518 kmem_free(cm_entry->x_ksp->ks_data, 2519 cm_entry->x_ksp->ks_data_size); 2520 kstat_delete(cm_entry->x_ksp); 2521 } 2522 2523 mutex_destroy(&cm_entry->x_lock); 2524 cv_destroy(&cm_entry->x_cv); 2525 cv_destroy(&cm_entry->x_conn_cv); 2526 cv_destroy(&cm_entry->x_dis_cv); 2527 2528 if (cm_entry->x_server.buf != NULL) 2529 kmem_free(cm_entry->x_server.buf, cm_entry->x_server.maxlen); 2530 if (cm_entry->x_src.buf != NULL) 2531 kmem_free(cm_entry->x_src.buf, cm_entry->x_src.maxlen); 2532 kmem_free(cm_entry, sizeof (struct cm_xprt)); 2533 } 2534 2535 /* 2536 * Called by KRPC after sending the call message to release the connection 2537 * it was using. 2538 */ 2539 static void 2540 connmgr_release(struct cm_xprt *cm_entry) 2541 { 2542 mutex_enter(&cm_entry->x_lock); 2543 cm_entry->x_ref--; 2544 if (cm_entry->x_ref == 0) 2545 cv_signal(&cm_entry->x_cv); 2546 mutex_exit(&cm_entry->x_lock); 2547 } 2548 2549 /* 2550 * Given an open stream, connect to the remote. Returns true if connected, 2551 * false otherwise. 2552 */ 2553 static bool_t 2554 connmgr_connect( 2555 struct cm_xprt *cm_entry, 2556 queue_t *wq, 2557 struct netbuf *addr, 2558 int addrfmly, 2559 calllist_t *e, 2560 int *tidu_ptr, 2561 bool_t reconnect, 2562 const struct timeval *waitp, 2563 bool_t nosignal, 2564 cred_t *cr) 2565 { 2566 mblk_t *mp; 2567 struct T_conn_req *tcr; 2568 struct T_info_ack *tinfo; 2569 int interrupted, error; 2570 int tidu_size, kstat_instance; 2571 2572 /* if it's a reconnect, flush any lingering data messages */ 2573 if (reconnect) 2574 (void) putctl1(wq, M_FLUSH, FLUSHRW); 2575 2576 /* 2577 * Note: if the receiver uses SCM_UCRED/getpeerucred the pid will 2578 * appear as -1. 2579 */ 2580 mp = allocb_cred(sizeof (*tcr) + addr->len, cr, NOPID); 2581 if (mp == NULL) { 2582 /* 2583 * This is unfortunate, but we need to look up the stats for 2584 * this zone to increment the "memory allocation failed" 2585 * counter. curproc->p_zone is safe since we're initiating a 2586 * connection and not in some strange streams context. 2587 */ 2588 struct rpcstat *rpcstat; 2589 2590 rpcstat = zone_getspecific(rpcstat_zone_key, rpc_zone()); 2591 ASSERT(rpcstat != NULL); 2592 2593 RPCLOG0(1, "connmgr_connect: cannot alloc mp for " 2594 "sending conn request\n"); 2595 COTSRCSTAT_INCR(rpcstat->rpc_cots_client, rcnomem); 2596 e->call_status = RPC_SYSTEMERROR; 2597 e->call_reason = ENOSR; 2598 return (FALSE); 2599 } 2600 2601 mp->b_datap->db_type = M_PROTO; 2602 tcr = (struct T_conn_req *)mp->b_rptr; 2603 bzero(tcr, sizeof (*tcr)); 2604 tcr->PRIM_type = T_CONN_REQ; 2605 tcr->DEST_length = addr->len; 2606 tcr->DEST_offset = sizeof (struct T_conn_req); 2607 mp->b_wptr = mp->b_rptr + sizeof (*tcr); 2608 2609 bcopy(addr->buf, mp->b_wptr, tcr->DEST_length); 2610 mp->b_wptr += tcr->DEST_length; 2611 2612 RPCLOG(8, "connmgr_connect: sending conn request on queue " 2613 "%p", (void *)wq); 2614 RPCLOG(8, " call %p\n", (void *)wq); 2615 /* 2616 * We use the entry in the handle that is normally used for 2617 * waiting for RPC replies to wait for the connection accept. 2618 */ 2619 if (clnt_dispatch_send(wq, mp, e, 0, 0) != RPC_SUCCESS) { 2620 DTRACE_PROBE(krpc__e__connmgr__connect__cantsend); 2621 freemsg(mp); 2622 return (FALSE); 2623 } 2624 2625 mutex_enter(&clnt_pending_lock); 2626 2627 /* 2628 * We wait for the transport connection to be made, or an 2629 * indication that it could not be made. 2630 */ 2631 interrupted = 0; 2632 2633 /* 2634 * waitforack should have been called with T_OK_ACK, but the 2635 * present implementation needs to be passed T_INFO_ACK to 2636 * work correctly. 2637 */ 2638 error = waitforack(e, T_INFO_ACK, waitp, nosignal); 2639 if (error == EINTR) 2640 interrupted = 1; 2641 if (zone_status_get(curproc->p_zone) >= ZONE_IS_EMPTY) { 2642 /* 2643 * No time to lose; we essentially have been signaled to 2644 * quit. 2645 */ 2646 interrupted = 1; 2647 } 2648 #ifdef RPCDEBUG 2649 if (error == ETIME) 2650 RPCLOG0(8, "connmgr_connect: giving up " 2651 "on connection attempt; " 2652 "clnt_dispatch notifyconn " 2653 "diagnostic 'no one waiting for " 2654 "connection' should not be " 2655 "unexpected\n"); 2656 #endif 2657 if (e->call_prev) 2658 e->call_prev->call_next = e->call_next; 2659 else 2660 clnt_pending = e->call_next; 2661 if (e->call_next) 2662 e->call_next->call_prev = e->call_prev; 2663 mutex_exit(&clnt_pending_lock); 2664 2665 if (e->call_status != RPC_SUCCESS || error != 0) { 2666 if (interrupted) 2667 e->call_status = RPC_INTR; 2668 else if (error == ETIME) 2669 e->call_status = RPC_TIMEDOUT; 2670 else if (error == EPROTO) 2671 e->call_status = RPC_SYSTEMERROR; 2672 2673 RPCLOG(8, "connmgr_connect: can't connect, status: " 2674 "%s\n", clnt_sperrno(e->call_status)); 2675 2676 if (e->call_reply) { 2677 freemsg(e->call_reply); 2678 e->call_reply = NULL; 2679 } 2680 2681 return (FALSE); 2682 } 2683 /* 2684 * The result of the "connection accept" is a T_info_ack 2685 * in the call_reply field. 2686 */ 2687 ASSERT(e->call_reply != NULL); 2688 mp = e->call_reply; 2689 e->call_reply = NULL; 2690 tinfo = (struct T_info_ack *)mp->b_rptr; 2691 2692 tidu_size = tinfo->TIDU_size; 2693 tidu_size -= (tidu_size % BYTES_PER_XDR_UNIT); 2694 if (tidu_size > COTS_DEFAULT_ALLOCSIZE || (tidu_size <= 0)) 2695 tidu_size = COTS_DEFAULT_ALLOCSIZE; 2696 *tidu_ptr = tidu_size; 2697 2698 freemsg(mp); 2699 2700 /* 2701 * Set up the pertinent options. NODELAY is so the transport doesn't 2702 * buffer up RPC messages on either end. This may not be valid for 2703 * all transports. Failure to set this option is not cause to 2704 * bail out so we return success anyway. Note that lack of NODELAY 2705 * or some other way to flush the message on both ends will cause 2706 * lots of retries and terrible performance. 2707 */ 2708 if (addrfmly == AF_INET || addrfmly == AF_INET6) { 2709 (void) connmgr_setopt(wq, IPPROTO_TCP, TCP_NODELAY, e, cr); 2710 if (e->call_status == RPC_XPRTFAILED) 2711 return (FALSE); 2712 } 2713 2714 /* 2715 * Since we have a connection, we now need to figure out if 2716 * we need to create a kstat. If x_ksp is not NULL then we 2717 * are reusing a connection and so we do not need to create 2718 * another kstat -- lets just return. 2719 */ 2720 if (cm_entry->x_ksp != NULL) 2721 return (TRUE); 2722 2723 /* 2724 * We need to increment rpc_kstat_instance atomically to prevent 2725 * two kstats being created with the same instance. 2726 */ 2727 kstat_instance = atomic_add_32_nv((uint32_t *)&rpc_kstat_instance, 1); 2728 2729 if ((cm_entry->x_ksp = kstat_create_zone("unix", kstat_instance, 2730 "rpc_cots_connections", "rpc", KSTAT_TYPE_NAMED, 2731 (uint_t)(sizeof (cm_kstat_xprt_t) / sizeof (kstat_named_t)), 2732 KSTAT_FLAG_VIRTUAL, cm_entry->x_zoneid)) == NULL) { 2733 return (TRUE); 2734 } 2735 2736 cm_entry->x_ksp->ks_lock = &connmgr_lock; 2737 cm_entry->x_ksp->ks_private = cm_entry; 2738 cm_entry->x_ksp->ks_data_size = ((INET6_ADDRSTRLEN * sizeof (char)) 2739 + sizeof (cm_kstat_template)); 2740 cm_entry->x_ksp->ks_data = kmem_alloc(cm_entry->x_ksp->ks_data_size, 2741 KM_SLEEP); 2742 bcopy(&cm_kstat_template, cm_entry->x_ksp->ks_data, 2743 cm_entry->x_ksp->ks_data_size); 2744 ((struct cm_kstat_xprt *)(cm_entry->x_ksp->ks_data))-> 2745 x_server.value.str.addr.ptr = 2746 kmem_alloc(INET6_ADDRSTRLEN, KM_SLEEP); 2747 2748 cm_entry->x_ksp->ks_update = conn_kstat_update; 2749 kstat_install(cm_entry->x_ksp); 2750 return (TRUE); 2751 } 2752 2753 /* 2754 * Called by connmgr_connect to set an option on the new stream. 2755 */ 2756 static bool_t 2757 connmgr_setopt(queue_t *wq, int level, int name, calllist_t *e, cred_t *cr) 2758 { 2759 mblk_t *mp; 2760 struct opthdr *opt; 2761 struct T_optmgmt_req *tor; 2762 struct timeval waitp; 2763 int error; 2764 2765 mp = allocb_cred(sizeof (struct T_optmgmt_req) + 2766 sizeof (struct opthdr) + sizeof (int), cr, NOPID); 2767 if (mp == NULL) { 2768 RPCLOG0(1, "connmgr_setopt: cannot alloc mp for option " 2769 "request\n"); 2770 return (FALSE); 2771 } 2772 2773 mp->b_datap->db_type = M_PROTO; 2774 tor = (struct T_optmgmt_req *)(mp->b_rptr); 2775 tor->PRIM_type = T_SVR4_OPTMGMT_REQ; 2776 tor->MGMT_flags = T_NEGOTIATE; 2777 tor->OPT_length = sizeof (struct opthdr) + sizeof (int); 2778 tor->OPT_offset = sizeof (struct T_optmgmt_req); 2779 2780 opt = (struct opthdr *)(mp->b_rptr + sizeof (struct T_optmgmt_req)); 2781 opt->level = level; 2782 opt->name = name; 2783 opt->len = sizeof (int); 2784 *(int *)((char *)opt + sizeof (*opt)) = 1; 2785 mp->b_wptr += sizeof (struct T_optmgmt_req) + sizeof (struct opthdr) + 2786 sizeof (int); 2787 2788 /* 2789 * We will use this connection regardless 2790 * of whether or not the option is settable. 2791 */ 2792 if (clnt_dispatch_send(wq, mp, e, 0, 0) != RPC_SUCCESS) { 2793 DTRACE_PROBE(krpc__e__connmgr__setopt__cantsend); 2794 freemsg(mp); 2795 return (FALSE); 2796 } 2797 2798 mutex_enter(&clnt_pending_lock); 2799 2800 waitp.tv_sec = clnt_cots_min_conntout; 2801 waitp.tv_usec = 0; 2802 error = waitforack(e, T_OPTMGMT_ACK, &waitp, 1); 2803 2804 if (e->call_prev) 2805 e->call_prev->call_next = e->call_next; 2806 else 2807 clnt_pending = e->call_next; 2808 if (e->call_next) 2809 e->call_next->call_prev = e->call_prev; 2810 mutex_exit(&clnt_pending_lock); 2811 2812 if (e->call_reply != NULL) { 2813 freemsg(e->call_reply); 2814 e->call_reply = NULL; 2815 } 2816 2817 if (e->call_status != RPC_SUCCESS || error != 0) { 2818 RPCLOG(1, "connmgr_setopt: can't set option: %d\n", name); 2819 return (FALSE); 2820 } 2821 RPCLOG(8, "connmgr_setopt: successfully set option: %d\n", name); 2822 return (TRUE); 2823 } 2824 2825 #ifdef DEBUG 2826 2827 /* 2828 * This is a knob to let us force code coverage in allocation failure 2829 * case. 2830 */ 2831 static int connmgr_failsnd; 2832 #define CONN_SND_ALLOC(Size, Pri) \ 2833 ((connmgr_failsnd-- > 0) ? NULL : allocb(Size, Pri)) 2834 2835 #else 2836 2837 #define CONN_SND_ALLOC(Size, Pri) allocb(Size, Pri) 2838 2839 #endif 2840 2841 /* 2842 * Sends an orderly release on the specified queue. 2843 * Entered with connmgr_lock. Exited without connmgr_lock 2844 */ 2845 static void 2846 connmgr_sndrel(struct cm_xprt *cm_entry) 2847 { 2848 struct T_ordrel_req *torr; 2849 mblk_t *mp; 2850 queue_t *q = cm_entry->x_wq; 2851 ASSERT(MUTEX_HELD(&connmgr_lock)); 2852 mp = CONN_SND_ALLOC(sizeof (struct T_ordrel_req), BPRI_LO); 2853 if (mp == NULL) { 2854 cm_entry->x_needrel = TRUE; 2855 mutex_exit(&connmgr_lock); 2856 RPCLOG(1, "connmgr_sndrel: cannot alloc mp for sending ordrel " 2857 "to queue %p\n", (void *)q); 2858 return; 2859 } 2860 mutex_exit(&connmgr_lock); 2861 2862 mp->b_datap->db_type = M_PROTO; 2863 torr = (struct T_ordrel_req *)(mp->b_rptr); 2864 torr->PRIM_type = T_ORDREL_REQ; 2865 mp->b_wptr = mp->b_rptr + sizeof (struct T_ordrel_req); 2866 2867 RPCLOG(8, "connmgr_sndrel: sending ordrel to queue %p\n", (void *)q); 2868 put(q, mp); 2869 } 2870 2871 /* 2872 * Sends an disconnect on the specified queue. 2873 * Entered with connmgr_lock. Exited without connmgr_lock 2874 */ 2875 static void 2876 connmgr_snddis(struct cm_xprt *cm_entry) 2877 { 2878 struct T_discon_req *tdis; 2879 mblk_t *mp; 2880 queue_t *q = cm_entry->x_wq; 2881 2882 ASSERT(MUTEX_HELD(&connmgr_lock)); 2883 mp = CONN_SND_ALLOC(sizeof (*tdis), BPRI_LO); 2884 if (mp == NULL) { 2885 cm_entry->x_needdis = TRUE; 2886 mutex_exit(&connmgr_lock); 2887 RPCLOG(1, "connmgr_snddis: cannot alloc mp for sending discon " 2888 "to queue %p\n", (void *)q); 2889 return; 2890 } 2891 mutex_exit(&connmgr_lock); 2892 2893 mp->b_datap->db_type = M_PROTO; 2894 tdis = (struct T_discon_req *)mp->b_rptr; 2895 tdis->PRIM_type = T_DISCON_REQ; 2896 mp->b_wptr = mp->b_rptr + sizeof (*tdis); 2897 2898 RPCLOG(8, "connmgr_snddis: sending discon to queue %p\n", (void *)q); 2899 put(q, mp); 2900 } 2901 2902 /* 2903 * Sets up the entry for receiving replies, and calls rpcmod's write put proc 2904 * (through put) to send the call. 2905 */ 2906 static int 2907 clnt_dispatch_send(queue_t *q, mblk_t *mp, calllist_t *e, uint_t xid, 2908 uint_t queue_flag) 2909 { 2910 ASSERT(e != NULL); 2911 2912 e->call_status = RPC_TIMEDOUT; /* optimistic, eh? */ 2913 e->call_reason = 0; 2914 e->call_wq = q; 2915 e->call_xid = xid; 2916 e->call_notified = FALSE; 2917 2918 if (!canput(q)) { 2919 e->call_status = RPC_CANTSEND; 2920 e->call_reason = ENOBUFS; 2921 return (RPC_CANTSEND); 2922 } 2923 2924 /* 2925 * If queue_flag is set then the calllist_t is already on the hash 2926 * queue. In this case just send the message and return. 2927 */ 2928 if (queue_flag) { 2929 put(q, mp); 2930 return (RPC_SUCCESS); 2931 2932 } 2933 2934 /* 2935 * Set up calls for RPC requests (with XID != 0) on the hash 2936 * queue for fast lookups and place other calls (i.e. 2937 * connection management) on the linked list. 2938 */ 2939 if (xid != 0) { 2940 RPCLOG(64, "clnt_dispatch_send: putting xid 0x%x on " 2941 "dispatch list\n", xid); 2942 e->call_hash = call_hash(xid, clnt_cots_hash_size); 2943 e->call_bucket = &cots_call_ht[e->call_hash]; 2944 call_table_enter(e); 2945 } else { 2946 mutex_enter(&clnt_pending_lock); 2947 if (clnt_pending) 2948 clnt_pending->call_prev = e; 2949 e->call_next = clnt_pending; 2950 e->call_prev = NULL; 2951 clnt_pending = e; 2952 mutex_exit(&clnt_pending_lock); 2953 } 2954 2955 put(q, mp); 2956 return (RPC_SUCCESS); 2957 } 2958 2959 /* 2960 * Called by rpcmod to notify a client with a clnt_pending call that its reply 2961 * has arrived. If we can't find a client waiting for this reply, we log 2962 * the error and return. 2963 */ 2964 bool_t 2965 clnt_dispatch_notify(mblk_t *mp, zoneid_t zoneid) 2966 { 2967 calllist_t *e = NULL; 2968 call_table_t *chtp; 2969 uint32_t xid; 2970 uint_t hash; 2971 2972 if ((IS_P2ALIGNED(mp->b_rptr, sizeof (uint32_t))) && 2973 (mp->b_wptr - mp->b_rptr) >= sizeof (xid)) 2974 xid = *((uint32_t *)mp->b_rptr); 2975 else { 2976 int i = 0; 2977 unsigned char *p = (unsigned char *)&xid; 2978 unsigned char *rptr; 2979 mblk_t *tmp = mp; 2980 2981 /* 2982 * Copy the xid, byte-by-byte into xid. 2983 */ 2984 while (tmp) { 2985 rptr = tmp->b_rptr; 2986 while (rptr < tmp->b_wptr) { 2987 *p++ = *rptr++; 2988 if (++i >= sizeof (xid)) 2989 goto done_xid_copy; 2990 } 2991 tmp = tmp->b_cont; 2992 } 2993 2994 /* 2995 * If we got here, we ran out of mblk space before the 2996 * xid could be copied. 2997 */ 2998 ASSERT(tmp == NULL && i < sizeof (xid)); 2999 3000 RPCLOG0(1, 3001 "clnt_dispatch_notify: message less than size of xid\n"); 3002 return (FALSE); 3003 3004 } 3005 done_xid_copy: 3006 3007 hash = call_hash(xid, clnt_cots_hash_size); 3008 chtp = &cots_call_ht[hash]; 3009 /* call_table_find returns with the hash bucket locked */ 3010 call_table_find(chtp, xid, e); 3011 3012 if (e != NULL) { 3013 /* 3014 * Found thread waiting for this reply 3015 */ 3016 mutex_enter(&e->call_lock); 3017 3018 /* 3019 * verify that the reply is coming in on 3020 * the same zone that it was sent from. 3021 */ 3022 if (e->call_zoneid != zoneid) { 3023 mutex_exit(&e->call_lock); 3024 mutex_exit(&chtp->ct_lock); 3025 return (FALSE); 3026 } 3027 3028 if (e->call_reply) 3029 /* 3030 * This can happen under the following scenario: 3031 * clnt_cots_kcallit() times out on the response, 3032 * rfscall() repeats the CLNT_CALL() with 3033 * the same xid, clnt_cots_kcallit() sends the retry, 3034 * thereby putting the clnt handle on the pending list, 3035 * the first response arrives, signalling the thread 3036 * in clnt_cots_kcallit(). Before that thread is 3037 * dispatched, the second response arrives as well, 3038 * and clnt_dispatch_notify still finds the handle on 3039 * the pending list, with call_reply set. So free the 3040 * old reply now. 3041 * 3042 * It is also possible for a response intended for 3043 * an RPC call with a different xid to reside here. 3044 * This can happen if the thread that owned this 3045 * client handle prior to the current owner bailed 3046 * out and left its call record on the dispatch 3047 * queue. A window exists where the response can 3048 * arrive before the current owner dispatches its 3049 * RPC call. 3050 * 3051 * In any case, this is the very last point where we 3052 * can safely check the call_reply field before 3053 * placing the new response there. 3054 */ 3055 freemsg(e->call_reply); 3056 e->call_reply = mp; 3057 e->call_status = RPC_SUCCESS; 3058 e->call_notified = TRUE; 3059 cv_signal(&e->call_cv); 3060 mutex_exit(&e->call_lock); 3061 mutex_exit(&chtp->ct_lock); 3062 return (TRUE); 3063 } else { 3064 zone_t *zone; 3065 struct rpcstat *rpcstat; 3066 3067 mutex_exit(&chtp->ct_lock); 3068 RPCLOG(65, "clnt_dispatch_notify: no caller for reply 0x%x\n", 3069 xid); 3070 /* 3071 * This is unfortunate, but we need to lookup the zone so we 3072 * can increment its "rcbadxids" counter. 3073 */ 3074 zone = zone_find_by_id(zoneid); 3075 if (zone == NULL) { 3076 /* 3077 * The zone went away... 3078 */ 3079 return (FALSE); 3080 } 3081 rpcstat = zone_getspecific(rpcstat_zone_key, zone); 3082 if (zone_status_get(zone) >= ZONE_IS_SHUTTING_DOWN) { 3083 /* 3084 * Not interested 3085 */ 3086 zone_rele(zone); 3087 return (FALSE); 3088 } 3089 COTSRCSTAT_INCR(rpcstat->rpc_cots_client, rcbadxids); 3090 zone_rele(zone); 3091 } 3092 return (FALSE); 3093 } 3094 3095 /* 3096 * Called by rpcmod when a non-data indication arrives. The ones in which we 3097 * are interested are connection indications and options acks. We dispatch 3098 * based on the queue the indication came in on. If we are not interested in 3099 * what came in, we return false to rpcmod, who will then pass it upstream. 3100 */ 3101 bool_t 3102 clnt_dispatch_notifyconn(queue_t *q, mblk_t *mp) 3103 { 3104 calllist_t *e; 3105 int type; 3106 3107 ASSERT((q->q_flag & QREADR) == 0); 3108 3109 type = ((union T_primitives *)mp->b_rptr)->type; 3110 RPCLOG(8, "clnt_dispatch_notifyconn: prim type: [%s]\n", 3111 rpc_tpiprim2name(type)); 3112 mutex_enter(&clnt_pending_lock); 3113 for (e = clnt_pending; /* NO CONDITION */; e = e->call_next) { 3114 if (e == NULL) { 3115 mutex_exit(&clnt_pending_lock); 3116 RPCLOG(1, "clnt_dispatch_notifyconn: no one waiting " 3117 "for connection on queue 0x%p\n", (void *)q); 3118 return (FALSE); 3119 } 3120 if (e->call_wq == q) 3121 break; 3122 } 3123 3124 switch (type) { 3125 case T_CONN_CON: 3126 /* 3127 * The transport is now connected, send a T_INFO_REQ to get 3128 * the tidu size. 3129 */ 3130 mutex_exit(&clnt_pending_lock); 3131 ASSERT(mp->b_datap->db_lim - mp->b_datap->db_base >= 3132 sizeof (struct T_info_req)); 3133 mp->b_rptr = mp->b_datap->db_base; 3134 ((union T_primitives *)mp->b_rptr)->type = T_INFO_REQ; 3135 mp->b_wptr = mp->b_rptr + sizeof (struct T_info_req); 3136 mp->b_datap->db_type = M_PCPROTO; 3137 put(q, mp); 3138 return (TRUE); 3139 case T_INFO_ACK: 3140 case T_OPTMGMT_ACK: 3141 e->call_status = RPC_SUCCESS; 3142 e->call_reply = mp; 3143 e->call_notified = TRUE; 3144 cv_signal(&e->call_cv); 3145 break; 3146 case T_ERROR_ACK: 3147 e->call_status = RPC_CANTCONNECT; 3148 e->call_reply = mp; 3149 e->call_notified = TRUE; 3150 cv_signal(&e->call_cv); 3151 break; 3152 case T_OK_ACK: 3153 /* 3154 * Great, but we are really waiting for a T_CONN_CON 3155 */ 3156 freemsg(mp); 3157 break; 3158 default: 3159 mutex_exit(&clnt_pending_lock); 3160 RPCLOG(1, "clnt_dispatch_notifyconn: bad type %d\n", type); 3161 return (FALSE); 3162 } 3163 3164 mutex_exit(&clnt_pending_lock); 3165 return (TRUE); 3166 } 3167 3168 /* 3169 * Called by rpcmod when the transport is (or should be) going away. Informs 3170 * all callers waiting for replies and marks the entry in the connection 3171 * manager's list as unconnected, and either closing (close handshake in 3172 * progress) or dead. 3173 */ 3174 void 3175 clnt_dispatch_notifyall(queue_t *q, int32_t msg_type, int32_t reason) 3176 { 3177 calllist_t *e; 3178 call_table_t *ctp; 3179 struct cm_xprt *cm_entry; 3180 int have_connmgr_lock; 3181 int i; 3182 3183 ASSERT((q->q_flag & QREADR) == 0); 3184 3185 RPCLOG(1, "clnt_dispatch_notifyall on queue %p", (void *)q); 3186 RPCLOG(1, " received a notifcation prim type [%s]", 3187 rpc_tpiprim2name(msg_type)); 3188 RPCLOG(1, " and reason %d\n", reason); 3189 3190 /* 3191 * Find the transport entry in the connection manager's list, close 3192 * the transport and delete the entry. In the case where rpcmod's 3193 * idle timer goes off, it sends us a T_ORDREL_REQ, indicating we 3194 * should gracefully close the connection. 3195 */ 3196 have_connmgr_lock = 1; 3197 mutex_enter(&connmgr_lock); 3198 for (cm_entry = cm_hd; cm_entry; cm_entry = cm_entry->x_next) { 3199 ASSERT(cm_entry != cm_entry->x_next); 3200 if (cm_entry->x_wq == q) { 3201 ASSERT(MUTEX_HELD(&connmgr_lock)); 3202 ASSERT(have_connmgr_lock == 1); 3203 switch (msg_type) { 3204 case T_ORDREL_REQ: 3205 3206 if (cm_entry->x_dead) { 3207 RPCLOG(1, "idle timeout on dead " 3208 "connection: %p\n", 3209 (void *)cm_entry); 3210 if (clnt_stop_idle != NULL) 3211 (*clnt_stop_idle)(q); 3212 break; 3213 } 3214 3215 /* 3216 * Only mark the connection as dead if it is 3217 * connected and idle. 3218 * An unconnected connection has probably 3219 * gone idle because the server is down, 3220 * and when it comes back up there will be 3221 * retries that need to use that connection. 3222 */ 3223 if (cm_entry->x_connected || 3224 cm_entry->x_doomed) { 3225 if (cm_entry->x_ordrel) { 3226 if (cm_entry->x_closing == 3227 TRUE) { 3228 /* 3229 * The connection is 3230 * obviously wedged due 3231 * to a bug or problem 3232 * with the transport. 3233 * Mark it as dead. 3234 * Otherwise we can 3235 * leak connections. 3236 */ 3237 cm_entry->x_dead = TRUE; 3238 mutex_exit( 3239 &connmgr_lock); 3240 have_connmgr_lock = 0; 3241 if (clnt_stop_idle != 3242 NULL) 3243 (*clnt_stop_idle)(q); 3244 break; 3245 } 3246 cm_entry->x_closing = TRUE; 3247 connmgr_sndrel(cm_entry); 3248 have_connmgr_lock = 0; 3249 } else { 3250 cm_entry->x_dead = TRUE; 3251 mutex_exit(&connmgr_lock); 3252 have_connmgr_lock = 0; 3253 if (clnt_stop_idle != NULL) 3254 (*clnt_stop_idle)(q); 3255 } 3256 } else { 3257 /* 3258 * We don't mark the connection 3259 * as dead, but we turn off the 3260 * idle timer. 3261 */ 3262 mutex_exit(&connmgr_lock); 3263 have_connmgr_lock = 0; 3264 if (clnt_stop_idle != NULL) 3265 (*clnt_stop_idle)(q); 3266 RPCLOG(1, "clnt_dispatch_notifyall:" 3267 " ignoring timeout from rpcmod" 3268 " (q %p) because we are not " 3269 " connected\n", (void *)q); 3270 } 3271 break; 3272 case T_ORDREL_IND: 3273 /* 3274 * If this entry is marked closing, then we are 3275 * completing a close handshake, and the 3276 * connection is dead. Otherwise, the server is 3277 * trying to close. Since the server will not 3278 * be sending any more RPC replies, we abort 3279 * the connection, including flushing 3280 * any RPC requests that are in-transit. 3281 * In either case, mark the entry as dead so 3282 * that it can be closed by the connection 3283 * manager's garbage collector. 3284 */ 3285 cm_entry->x_dead = TRUE; 3286 if (cm_entry->x_closing) { 3287 mutex_exit(&connmgr_lock); 3288 have_connmgr_lock = 0; 3289 if (clnt_stop_idle != NULL) 3290 (*clnt_stop_idle)(q); 3291 } else { 3292 /* 3293 * if we're getting a disconnect 3294 * before we've finished our 3295 * connect attempt, mark it for 3296 * later processing 3297 */ 3298 if (cm_entry->x_thread) 3299 cm_entry->x_early_disc = TRUE; 3300 else 3301 cm_entry->x_connected = FALSE; 3302 cm_entry->x_waitdis = TRUE; 3303 connmgr_snddis(cm_entry); 3304 have_connmgr_lock = 0; 3305 } 3306 break; 3307 3308 case T_ERROR_ACK: 3309 case T_OK_ACK: 3310 cm_entry->x_waitdis = FALSE; 3311 cv_signal(&cm_entry->x_dis_cv); 3312 mutex_exit(&connmgr_lock); 3313 return; 3314 3315 case T_DISCON_REQ: 3316 if (cm_entry->x_thread) 3317 cm_entry->x_early_disc = TRUE; 3318 else 3319 cm_entry->x_connected = FALSE; 3320 cm_entry->x_waitdis = TRUE; 3321 3322 connmgr_snddis(cm_entry); 3323 have_connmgr_lock = 0; 3324 break; 3325 3326 case T_DISCON_IND: 3327 default: 3328 /* 3329 * if we're getting a disconnect before 3330 * we've finished our connect attempt, 3331 * mark it for later processing 3332 */ 3333 if (cm_entry->x_closing) { 3334 cm_entry->x_dead = TRUE; 3335 mutex_exit(&connmgr_lock); 3336 have_connmgr_lock = 0; 3337 if (clnt_stop_idle != NULL) 3338 (*clnt_stop_idle)(q); 3339 } else { 3340 if (cm_entry->x_thread) { 3341 cm_entry->x_early_disc = TRUE; 3342 } else { 3343 cm_entry->x_dead = TRUE; 3344 cm_entry->x_connected = FALSE; 3345 } 3346 } 3347 break; 3348 } 3349 break; 3350 } 3351 } 3352 3353 if (have_connmgr_lock) 3354 mutex_exit(&connmgr_lock); 3355 3356 if (msg_type == T_ERROR_ACK || msg_type == T_OK_ACK) { 3357 RPCLOG(1, "clnt_dispatch_notifyall: (wq %p) could not find " 3358 "connmgr entry for discon ack\n", (void *)q); 3359 return; 3360 } 3361 3362 /* 3363 * Then kick all the clnt_pending calls out of their wait. There 3364 * should be no clnt_pending calls in the case of rpcmod's idle 3365 * timer firing. 3366 */ 3367 for (i = 0; i < clnt_cots_hash_size; i++) { 3368 ctp = &cots_call_ht[i]; 3369 mutex_enter(&ctp->ct_lock); 3370 for (e = ctp->ct_call_next; 3371 e != (calllist_t *)ctp; 3372 e = e->call_next) { 3373 if (e->call_wq == q && e->call_notified == FALSE) { 3374 RPCLOG(1, 3375 "clnt_dispatch_notifyall for queue %p ", 3376 (void *)q); 3377 RPCLOG(1, "aborting clnt_pending call %p\n", 3378 (void *)e); 3379 3380 if (msg_type == T_DISCON_IND) 3381 e->call_reason = reason; 3382 e->call_notified = TRUE; 3383 e->call_status = RPC_XPRTFAILED; 3384 cv_signal(&e->call_cv); 3385 } 3386 } 3387 mutex_exit(&ctp->ct_lock); 3388 } 3389 3390 mutex_enter(&clnt_pending_lock); 3391 for (e = clnt_pending; e; e = e->call_next) { 3392 /* 3393 * Only signal those RPC handles that haven't been 3394 * signalled yet. Otherwise we can get a bogus call_reason. 3395 * This can happen if thread A is making a call over a 3396 * connection. If the server is killed, it will cause 3397 * reset, and reason will default to EIO as a result of 3398 * a T_ORDREL_IND. Thread B then attempts to recreate 3399 * the connection but gets a T_DISCON_IND. If we set the 3400 * call_reason code for all threads, then if thread A 3401 * hasn't been dispatched yet, it will get the wrong 3402 * reason. The bogus call_reason can make it harder to 3403 * discriminate between calls that fail because the 3404 * connection attempt failed versus those where the call 3405 * may have been executed on the server. 3406 */ 3407 if (e->call_wq == q && e->call_notified == FALSE) { 3408 RPCLOG(1, "clnt_dispatch_notifyall for queue %p ", 3409 (void *)q); 3410 RPCLOG(1, " aborting clnt_pending call %p\n", 3411 (void *)e); 3412 3413 if (msg_type == T_DISCON_IND) 3414 e->call_reason = reason; 3415 e->call_notified = TRUE; 3416 /* 3417 * Let the caller timeout, else he will retry 3418 * immediately. 3419 */ 3420 e->call_status = RPC_XPRTFAILED; 3421 3422 /* 3423 * We used to just signal those threads 3424 * waiting for a connection, (call_xid = 0). 3425 * That meant that threads waiting for a response 3426 * waited till their timeout expired. This 3427 * could be a long time if they've specified a 3428 * maximum timeout. (2^31 - 1). So we 3429 * Signal all threads now. 3430 */ 3431 cv_signal(&e->call_cv); 3432 } 3433 } 3434 mutex_exit(&clnt_pending_lock); 3435 } 3436 3437 3438 /*ARGSUSED*/ 3439 /* 3440 * after resuming a system that's been suspended for longer than the 3441 * NFS server's idle timeout (svc_idle_timeout for Solaris 2), rfscall() 3442 * generates "NFS server X not responding" and "NFS server X ok" messages; 3443 * here we reset inet connections to cause a re-connect and avoid those 3444 * NFS messages. see 4045054 3445 */ 3446 boolean_t 3447 connmgr_cpr_reset(void *arg, int code) 3448 { 3449 struct cm_xprt *cxp; 3450 3451 if (code == CB_CODE_CPR_CHKPT) 3452 return (B_TRUE); 3453 3454 if (mutex_tryenter(&connmgr_lock) == 0) 3455 return (B_FALSE); 3456 for (cxp = cm_hd; cxp; cxp = cxp->x_next) { 3457 if ((cxp->x_family == AF_INET || cxp->x_family == AF_INET6) && 3458 cxp->x_connected == TRUE) { 3459 if (cxp->x_thread) 3460 cxp->x_early_disc = TRUE; 3461 else 3462 cxp->x_connected = FALSE; 3463 cxp->x_needdis = TRUE; 3464 } 3465 } 3466 mutex_exit(&connmgr_lock); 3467 return (B_TRUE); 3468 } 3469 3470 void 3471 clnt_cots_stats_init(zoneid_t zoneid, struct rpc_cots_client **statsp) 3472 { 3473 3474 *statsp = (struct rpc_cots_client *)rpcstat_zone_init_common(zoneid, 3475 "unix", "rpc_cots_client", (const kstat_named_t *)&cots_rcstat_tmpl, 3476 sizeof (cots_rcstat_tmpl)); 3477 } 3478 3479 void 3480 clnt_cots_stats_fini(zoneid_t zoneid, struct rpc_cots_client **statsp) 3481 { 3482 rpcstat_zone_fini_common(zoneid, "unix", "rpc_cots_client"); 3483 kmem_free(*statsp, sizeof (cots_rcstat_tmpl)); 3484 } 3485 3486 void 3487 clnt_cots_init(void) 3488 { 3489 mutex_init(&connmgr_lock, NULL, MUTEX_DEFAULT, NULL); 3490 mutex_init(&clnt_pending_lock, NULL, MUTEX_DEFAULT, NULL); 3491 3492 if (clnt_cots_hash_size < DEFAULT_MIN_HASH_SIZE) 3493 clnt_cots_hash_size = DEFAULT_MIN_HASH_SIZE; 3494 3495 cots_call_ht = call_table_init(clnt_cots_hash_size); 3496 zone_key_create(&zone_cots_key, NULL, NULL, clnt_zone_destroy); 3497 } 3498 3499 void 3500 clnt_cots_fini(void) 3501 { 3502 (void) zone_key_delete(zone_cots_key); 3503 } 3504 3505 /* 3506 * Wait for TPI ack, returns success only if expected ack is received 3507 * within timeout period. 3508 */ 3509 3510 static int 3511 waitforack(calllist_t *e, t_scalar_t ack_prim, const struct timeval *waitp, 3512 bool_t nosignal) 3513 { 3514 union T_primitives *tpr; 3515 clock_t timout; 3516 int cv_stat = 1; 3517 3518 ASSERT(MUTEX_HELD(&clnt_pending_lock)); 3519 while (e->call_reply == NULL) { 3520 if (waitp != NULL) { 3521 timout = waitp->tv_sec * drv_usectohz(MICROSEC) + 3522 drv_usectohz(waitp->tv_usec) + lbolt; 3523 if (nosignal) 3524 cv_stat = cv_timedwait(&e->call_cv, 3525 &clnt_pending_lock, timout); 3526 else 3527 cv_stat = cv_timedwait_sig(&e->call_cv, 3528 &clnt_pending_lock, timout); 3529 } else { 3530 if (nosignal) 3531 cv_wait(&e->call_cv, &clnt_pending_lock); 3532 else 3533 cv_stat = cv_wait_sig(&e->call_cv, 3534 &clnt_pending_lock); 3535 } 3536 if (cv_stat == -1) 3537 return (ETIME); 3538 if (cv_stat == 0) 3539 return (EINTR); 3540 /* 3541 * if we received an error from the server and we know a reply 3542 * is not going to be sent, do not wait for the full timeout, 3543 * return now. 3544 */ 3545 if (e->call_status == RPC_XPRTFAILED) 3546 return (e->call_reason); 3547 } 3548 tpr = (union T_primitives *)e->call_reply->b_rptr; 3549 if (tpr->type == ack_prim) 3550 return (0); /* Success */ 3551 3552 if (tpr->type == T_ERROR_ACK) { 3553 if (tpr->error_ack.TLI_error == TSYSERR) 3554 return (tpr->error_ack.UNIX_error); 3555 else 3556 return (t_tlitosyserr(tpr->error_ack.TLI_error)); 3557 } 3558 3559 return (EPROTO); /* unknown or unexpected primitive */ 3560 } 3561