svc_dg.c revision 261046
1/* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31/* 32 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 33 */ 34 35#if defined(LIBC_SCCS) && !defined(lint) 36#ident "@(#)svc_dg.c 1.17 94/04/24 SMI" 37#endif 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: stable/10/lib/libc/rpc/svc_dg.c 261046 2014-01-22 23:45:27Z mav $"); 40 41/* 42 * svc_dg.c, Server side for connectionless RPC. 43 * 44 * Does some caching in the hopes of achieving execute-at-most-once semantics. 45 */ 46 47#include "namespace.h" 48#include "reentrant.h" 49#include <sys/types.h> 50#include <sys/socket.h> 51#include <rpc/rpc.h> 52#include <rpc/svc_dg.h> 53#include <assert.h> 54#include <errno.h> 55#include <unistd.h> 56#include <stdio.h> 57#include <stdlib.h> 58#include <string.h> 59#ifdef RPC_CACHE_DEBUG 60#include <netconfig.h> 61#include <netdir.h> 62#endif 63#include <err.h> 64#include "un-namespace.h" 65 66#include "rpc_com.h" 67#include "mt_misc.h" 68 69#define su_data(xprt) ((struct svc_dg_data *)(xprt->xp_p2)) 70#define rpc_buffer(xprt) ((xprt)->xp_p1) 71 72#ifndef MAX 73#define MAX(a, b) (((a) > (b)) ? (a) : (b)) 74#endif 75 76static void svc_dg_ops(SVCXPRT *); 77static enum xprt_stat svc_dg_stat(SVCXPRT *); 78static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *); 79static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *); 80static bool_t svc_dg_getargs(SVCXPRT *, xdrproc_t, void *); 81static bool_t svc_dg_freeargs(SVCXPRT *, xdrproc_t, void *); 82static void svc_dg_destroy(SVCXPRT *); 83static bool_t svc_dg_control(SVCXPRT *, const u_int, void *); 84static int cache_get(SVCXPRT *, struct rpc_msg *, char **, size_t *); 85static void cache_set(SVCXPRT *, size_t); 86int svc_dg_enablecache(SVCXPRT *, u_int); 87 88/* 89 * Usage: 90 * xprt = svc_dg_create(sock, sendsize, recvsize); 91 * Does other connectionless specific initializations. 92 * Once *xprt is initialized, it is registered. 93 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable 94 * system defaults are chosen. 95 * The routines returns NULL if a problem occurred. 96 */ 97static const char svc_dg_str[] = "svc_dg_create: %s"; 98static const char svc_dg_err1[] = "could not get transport information"; 99static const char svc_dg_err2[] = "transport does not support data transfer"; 100static const char svc_dg_err3[] = "getsockname failed"; 101static const char svc_dg_err4[] = "cannot set IP_RECVDSTADDR"; 102static const char __no_mem_str[] = "out of memory"; 103 104SVCXPRT * 105svc_dg_create(fd, sendsize, recvsize) 106 int fd; 107 u_int sendsize; 108 u_int recvsize; 109{ 110 SVCXPRT *xprt; 111 struct svc_dg_data *su = NULL; 112 struct __rpc_sockinfo si; 113 struct sockaddr_storage ss; 114 socklen_t slen; 115 116 if (!__rpc_fd2sockinfo(fd, &si)) { 117 warnx(svc_dg_str, svc_dg_err1); 118 return (NULL); 119 } 120 /* 121 * Find the receive and the send size 122 */ 123 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 124 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 125 if ((sendsize == 0) || (recvsize == 0)) { 126 warnx(svc_dg_str, svc_dg_err2); 127 return (NULL); 128 } 129 130 xprt = svc_xprt_alloc(); 131 if (xprt == NULL) 132 goto freedata; 133 134 su = mem_alloc(sizeof (*su)); 135 if (su == NULL) 136 goto freedata; 137 su->su_iosz = ((MAX(sendsize, recvsize) + 3) / 4) * 4; 138 if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL) 139 goto freedata; 140 xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, 141 XDR_DECODE); 142 su->su_cache = NULL; 143 xprt->xp_fd = fd; 144 xprt->xp_p2 = su; 145 xprt->xp_verf.oa_base = su->su_verfbody; 146 svc_dg_ops(xprt); 147 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage); 148 149 slen = sizeof ss; 150 if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) { 151 warnx(svc_dg_str, svc_dg_err3); 152 goto freedata_nowarn; 153 } 154 xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage)); 155 xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage); 156 xprt->xp_ltaddr.len = slen; 157 memcpy(xprt->xp_ltaddr.buf, &ss, slen); 158 159 if (ss.ss_family == AF_INET) { 160 struct sockaddr_in *sin; 161 static const int true_value = 1; 162 163 sin = (struct sockaddr_in *)(void *)&ss; 164 if (sin->sin_addr.s_addr == INADDR_ANY) { 165 su->su_srcaddr.buf = mem_alloc(sizeof (ss)); 166 su->su_srcaddr.maxlen = sizeof (ss); 167 168 if (_setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, 169 &true_value, sizeof(true_value))) { 170 warnx(svc_dg_str, svc_dg_err4); 171 goto freedata_nowarn; 172 } 173 } 174 } 175 176 xprt_register(xprt); 177 return (xprt); 178freedata: 179 (void) warnx(svc_dg_str, __no_mem_str); 180freedata_nowarn: 181 if (xprt) { 182 if (su) 183 (void) mem_free(su, sizeof (*su)); 184 svc_xprt_free(xprt); 185 } 186 return (NULL); 187} 188 189/*ARGSUSED*/ 190static enum xprt_stat 191svc_dg_stat(xprt) 192 SVCXPRT *xprt; 193{ 194 return (XPRT_IDLE); 195} 196 197static int 198svc_dg_recvfrom(int fd, char *buf, int buflen, 199 struct sockaddr *raddr, socklen_t *raddrlen, 200 struct sockaddr *laddr, socklen_t *laddrlen) 201{ 202 struct msghdr msg; 203 struct iovec msg_iov[1]; 204 struct sockaddr_in *lin = (struct sockaddr_in *)laddr; 205 int rlen; 206 bool_t have_lin = FALSE; 207 char tmp[CMSG_LEN(sizeof(*lin))]; 208 struct cmsghdr *cmsg; 209 210 memset((char *)&msg, 0, sizeof(msg)); 211 msg_iov[0].iov_base = buf; 212 msg_iov[0].iov_len = buflen; 213 msg.msg_iov = msg_iov; 214 msg.msg_iovlen = 1; 215 msg.msg_namelen = *raddrlen; 216 msg.msg_name = (char *)raddr; 217 if (laddr != NULL) { 218 msg.msg_control = (caddr_t)tmp; 219 msg.msg_controllen = CMSG_LEN(sizeof(*lin)); 220 } 221 rlen = _recvmsg(fd, &msg, 0); 222 if (rlen >= 0) 223 *raddrlen = msg.msg_namelen; 224 225 if (rlen == -1 || laddr == NULL || 226 msg.msg_controllen < sizeof(struct cmsghdr) || 227 msg.msg_flags & MSG_CTRUNC) 228 return rlen; 229 230 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; 231 cmsg = CMSG_NXTHDR(&msg, cmsg)) { 232 if (cmsg->cmsg_level == IPPROTO_IP && 233 cmsg->cmsg_type == IP_RECVDSTADDR) { 234 have_lin = TRUE; 235 memcpy(&lin->sin_addr, 236 (struct in_addr *)CMSG_DATA(cmsg), 237 sizeof(struct in_addr)); 238 break; 239 } 240 } 241 242 lin->sin_family = AF_INET; 243 lin->sin_port = 0; 244 *laddrlen = sizeof(struct sockaddr_in); 245 246 if (!have_lin) 247 lin->sin_addr.s_addr = INADDR_ANY; 248 249 return rlen; 250} 251 252static bool_t 253svc_dg_recv(xprt, msg) 254 SVCXPRT *xprt; 255 struct rpc_msg *msg; 256{ 257 struct svc_dg_data *su = su_data(xprt); 258 XDR *xdrs = &(su->su_xdrs); 259 char *reply; 260 struct sockaddr_storage ss; 261 socklen_t alen; 262 size_t replylen; 263 ssize_t rlen; 264 265again: 266 alen = sizeof (struct sockaddr_storage); 267 rlen = svc_dg_recvfrom(xprt->xp_fd, rpc_buffer(xprt), su->su_iosz, 268 (struct sockaddr *)(void *)&ss, &alen, 269 (struct sockaddr *)su->su_srcaddr.buf, &su->su_srcaddr.len); 270 if (rlen == -1 && errno == EINTR) 271 goto again; 272 if (rlen == -1 || (rlen < (ssize_t)(4 * sizeof (u_int32_t)))) 273 return (FALSE); 274 if (xprt->xp_rtaddr.len < alen) { 275 if (xprt->xp_rtaddr.len != 0) 276 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.len); 277 xprt->xp_rtaddr.buf = mem_alloc(alen); 278 xprt->xp_rtaddr.len = alen; 279 } 280 memcpy(xprt->xp_rtaddr.buf, &ss, alen); 281#ifdef PORTMAP 282 if (ss.ss_family == AF_INET) { 283 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf; 284 xprt->xp_addrlen = sizeof (struct sockaddr_in); 285 } 286#endif /* PORTMAP */ 287 xdrs->x_op = XDR_DECODE; 288 XDR_SETPOS(xdrs, 0); 289 if (! xdr_callmsg(xdrs, msg)) { 290 return (FALSE); 291 } 292 su->su_xid = msg->rm_xid; 293 if (su->su_cache != NULL) { 294 if (cache_get(xprt, msg, &reply, &replylen)) { 295 (void)_sendto(xprt->xp_fd, reply, replylen, 0, 296 (struct sockaddr *)(void *)&ss, alen); 297 return (FALSE); 298 } 299 } 300 return (TRUE); 301} 302 303static int 304svc_dg_sendto(int fd, char *buf, int buflen, 305 const struct sockaddr *raddr, socklen_t raddrlen, 306 const struct sockaddr *laddr, socklen_t laddrlen) 307{ 308 struct msghdr msg; 309 struct iovec msg_iov[1]; 310 struct sockaddr_in *laddr_in = (struct sockaddr_in *)laddr; 311 struct in_addr *lin = &laddr_in->sin_addr; 312 char tmp[CMSG_SPACE(sizeof(*lin))]; 313 struct cmsghdr *cmsg; 314 315 memset((char *)&msg, 0, sizeof(msg)); 316 msg_iov[0].iov_base = buf; 317 msg_iov[0].iov_len = buflen; 318 msg.msg_iov = msg_iov; 319 msg.msg_iovlen = 1; 320 msg.msg_namelen = raddrlen; 321 msg.msg_name = (char *)raddr; 322 323 if (laddr != NULL && laddr->sa_family == AF_INET && 324 lin->s_addr != INADDR_ANY) { 325 msg.msg_control = (caddr_t)tmp; 326 msg.msg_controllen = CMSG_LEN(sizeof(*lin)); 327 cmsg = CMSG_FIRSTHDR(&msg); 328 cmsg->cmsg_len = CMSG_LEN(sizeof(*lin)); 329 cmsg->cmsg_level = IPPROTO_IP; 330 cmsg->cmsg_type = IP_SENDSRCADDR; 331 memcpy(CMSG_DATA(cmsg), lin, sizeof(*lin)); 332 } 333 334 return _sendmsg(fd, &msg, 0); 335} 336 337static bool_t 338svc_dg_reply(xprt, msg) 339 SVCXPRT *xprt; 340 struct rpc_msg *msg; 341{ 342 struct svc_dg_data *su = su_data(xprt); 343 XDR *xdrs = &(su->su_xdrs); 344 bool_t stat = TRUE; 345 size_t slen; 346 xdrproc_t xdr_proc; 347 caddr_t xdr_where; 348 349 xdrs->x_op = XDR_ENCODE; 350 XDR_SETPOS(xdrs, 0); 351 msg->rm_xid = su->su_xid; 352 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 353 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 354 xdr_proc = msg->acpted_rply.ar_results.proc; 355 xdr_where = msg->acpted_rply.ar_results.where; 356 msg->acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; 357 msg->acpted_rply.ar_results.where = NULL; 358 359 if (!xdr_replymsg(xdrs, msg) || 360 !SVCAUTH_WRAP(&SVC_AUTH(xprt), xdrs, xdr_proc, xdr_where)) 361 stat = FALSE; 362 } else { 363 stat = xdr_replymsg(xdrs, msg); 364 } 365 if (stat) { 366 slen = XDR_GETPOS(xdrs); 367 if (svc_dg_sendto(xprt->xp_fd, rpc_buffer(xprt), slen, 368 (struct sockaddr *)xprt->xp_rtaddr.buf, 369 (socklen_t)xprt->xp_rtaddr.len, 370 (struct sockaddr *)su->su_srcaddr.buf, 371 (socklen_t)su->su_srcaddr.len) == (ssize_t) slen) { 372 stat = TRUE; 373 if (su->su_cache) 374 cache_set(xprt, slen); 375 } 376 } 377 return (stat); 378} 379 380static bool_t 381svc_dg_getargs(xprt, xdr_args, args_ptr) 382 SVCXPRT *xprt; 383 xdrproc_t xdr_args; 384 void *args_ptr; 385{ 386 struct svc_dg_data *su; 387 388 assert(xprt != NULL); 389 su = su_data(xprt); 390 return (SVCAUTH_UNWRAP(&SVC_AUTH(xprt), 391 &su->su_xdrs, xdr_args, args_ptr)); 392} 393 394static bool_t 395svc_dg_freeargs(xprt, xdr_args, args_ptr) 396 SVCXPRT *xprt; 397 xdrproc_t xdr_args; 398 void *args_ptr; 399{ 400 XDR *xdrs = &(su_data(xprt)->su_xdrs); 401 402 xdrs->x_op = XDR_FREE; 403 return (*xdr_args)(xdrs, args_ptr); 404} 405 406static void 407svc_dg_destroy(xprt) 408 SVCXPRT *xprt; 409{ 410 struct svc_dg_data *su = su_data(xprt); 411 412 xprt_unregister(xprt); 413 if (xprt->xp_fd != -1) 414 (void)_close(xprt->xp_fd); 415 XDR_DESTROY(&(su->su_xdrs)); 416 (void) mem_free(rpc_buffer(xprt), su->su_iosz); 417 if (su->su_srcaddr.buf) 418 (void) mem_free(su->su_srcaddr.buf, su->su_srcaddr.maxlen); 419 (void) mem_free(su, sizeof (*su)); 420 if (xprt->xp_rtaddr.buf) 421 (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen); 422 if (xprt->xp_ltaddr.buf) 423 (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen); 424 if (xprt->xp_tp) 425 (void) free(xprt->xp_tp); 426 svc_xprt_free(xprt); 427} 428 429static bool_t 430/*ARGSUSED*/ 431svc_dg_control(xprt, rq, in) 432 SVCXPRT *xprt; 433 const u_int rq; 434 void *in; 435{ 436 return (FALSE); 437} 438 439static void 440svc_dg_ops(xprt) 441 SVCXPRT *xprt; 442{ 443 static struct xp_ops ops; 444 static struct xp_ops2 ops2; 445 446/* VARIABLES PROTECTED BY ops_lock: ops */ 447 448 mutex_lock(&ops_lock); 449 if (ops.xp_recv == NULL) { 450 ops.xp_recv = svc_dg_recv; 451 ops.xp_stat = svc_dg_stat; 452 ops.xp_getargs = svc_dg_getargs; 453 ops.xp_reply = svc_dg_reply; 454 ops.xp_freeargs = svc_dg_freeargs; 455 ops.xp_destroy = svc_dg_destroy; 456 ops2.xp_control = svc_dg_control; 457 } 458 xprt->xp_ops = &ops; 459 xprt->xp_ops2 = &ops2; 460 mutex_unlock(&ops_lock); 461} 462 463/* The CACHING COMPONENT */ 464 465/* 466 * Could have been a separate file, but some part of it depends upon the 467 * private structure of the client handle. 468 * 469 * Fifo cache for cl server 470 * Copies pointers to reply buffers into fifo cache 471 * Buffers are sent again if retransmissions are detected. 472 */ 473 474#define SPARSENESS 4 /* 75% sparse */ 475 476#define ALLOC(type, size) \ 477 (type *) mem_alloc((sizeof (type) * (size))) 478 479#define MEMZERO(addr, type, size) \ 480 (void) memset((void *) (addr), 0, sizeof (type) * (int) (size)) 481 482#define FREE(addr, type, size) \ 483 mem_free((addr), (sizeof (type) * (size))) 484 485/* 486 * An entry in the cache 487 */ 488typedef struct cache_node *cache_ptr; 489struct cache_node { 490 /* 491 * Index into cache is xid, proc, vers, prog and address 492 */ 493 u_int32_t cache_xid; 494 rpcproc_t cache_proc; 495 rpcvers_t cache_vers; 496 rpcprog_t cache_prog; 497 struct netbuf cache_addr; 498 /* 499 * The cached reply and length 500 */ 501 char *cache_reply; 502 size_t cache_replylen; 503 /* 504 * Next node on the list, if there is a collision 505 */ 506 cache_ptr cache_next; 507}; 508 509/* 510 * The entire cache 511 */ 512struct cl_cache { 513 u_int uc_size; /* size of cache */ 514 cache_ptr *uc_entries; /* hash table of entries in cache */ 515 cache_ptr *uc_fifo; /* fifo list of entries in cache */ 516 u_int uc_nextvictim; /* points to next victim in fifo list */ 517 rpcprog_t uc_prog; /* saved program number */ 518 rpcvers_t uc_vers; /* saved version number */ 519 rpcproc_t uc_proc; /* saved procedure number */ 520}; 521 522 523/* 524 * the hashing function 525 */ 526#define CACHE_LOC(transp, xid) \ 527 (xid % (SPARSENESS * ((struct cl_cache *) \ 528 su_data(transp)->su_cache)->uc_size)) 529 530/* 531 * Enable use of the cache. Returns 1 on success, 0 on failure. 532 * Note: there is no disable. 533 */ 534static const char cache_enable_str[] = "svc_enablecache: %s %s"; 535static const char alloc_err[] = "could not allocate cache "; 536static const char enable_err[] = "cache already enabled"; 537 538int 539svc_dg_enablecache(transp, size) 540 SVCXPRT *transp; 541 u_int size; 542{ 543 struct svc_dg_data *su = su_data(transp); 544 struct cl_cache *uc; 545 546 mutex_lock(&dupreq_lock); 547 if (su->su_cache != NULL) { 548 (void) warnx(cache_enable_str, enable_err, " "); 549 mutex_unlock(&dupreq_lock); 550 return (0); 551 } 552 uc = ALLOC(struct cl_cache, 1); 553 if (uc == NULL) { 554 warnx(cache_enable_str, alloc_err, " "); 555 mutex_unlock(&dupreq_lock); 556 return (0); 557 } 558 uc->uc_size = size; 559 uc->uc_nextvictim = 0; 560 uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS); 561 if (uc->uc_entries == NULL) { 562 warnx(cache_enable_str, alloc_err, "data"); 563 FREE(uc, struct cl_cache, 1); 564 mutex_unlock(&dupreq_lock); 565 return (0); 566 } 567 MEMZERO(uc->uc_entries, cache_ptr, size * SPARSENESS); 568 uc->uc_fifo = ALLOC(cache_ptr, size); 569 if (uc->uc_fifo == NULL) { 570 warnx(cache_enable_str, alloc_err, "fifo"); 571 FREE(uc->uc_entries, cache_ptr, size * SPARSENESS); 572 FREE(uc, struct cl_cache, 1); 573 mutex_unlock(&dupreq_lock); 574 return (0); 575 } 576 MEMZERO(uc->uc_fifo, cache_ptr, size); 577 su->su_cache = (char *)(void *)uc; 578 mutex_unlock(&dupreq_lock); 579 return (1); 580} 581 582/* 583 * Set an entry in the cache. It assumes that the uc entry is set from 584 * the earlier call to cache_get() for the same procedure. This will always 585 * happen because cache_get() is calle by svc_dg_recv and cache_set() is called 586 * by svc_dg_reply(). All this hoopla because the right RPC parameters are 587 * not available at svc_dg_reply time. 588 */ 589 590static const char cache_set_str[] = "cache_set: %s"; 591static const char cache_set_err1[] = "victim not found"; 592static const char cache_set_err2[] = "victim alloc failed"; 593static const char cache_set_err3[] = "could not allocate new rpc buffer"; 594 595static void 596cache_set(xprt, replylen) 597 SVCXPRT *xprt; 598 size_t replylen; 599{ 600 cache_ptr victim; 601 cache_ptr *vicp; 602 struct svc_dg_data *su = su_data(xprt); 603 struct cl_cache *uc = (struct cl_cache *) su->su_cache; 604 u_int loc; 605 char *newbuf; 606#ifdef RPC_CACHE_DEBUG 607 struct netconfig *nconf; 608 char *uaddr; 609#endif 610 611 mutex_lock(&dupreq_lock); 612 /* 613 * Find space for the new entry, either by 614 * reusing an old entry, or by mallocing a new one 615 */ 616 victim = uc->uc_fifo[uc->uc_nextvictim]; 617 if (victim != NULL) { 618 loc = CACHE_LOC(xprt, victim->cache_xid); 619 for (vicp = &uc->uc_entries[loc]; 620 *vicp != NULL && *vicp != victim; 621 vicp = &(*vicp)->cache_next) 622 ; 623 if (*vicp == NULL) { 624 warnx(cache_set_str, cache_set_err1); 625 mutex_unlock(&dupreq_lock); 626 return; 627 } 628 *vicp = victim->cache_next; /* remove from cache */ 629 newbuf = victim->cache_reply; 630 } else { 631 victim = ALLOC(struct cache_node, 1); 632 if (victim == NULL) { 633 warnx(cache_set_str, cache_set_err2); 634 mutex_unlock(&dupreq_lock); 635 return; 636 } 637 newbuf = mem_alloc(su->su_iosz); 638 if (newbuf == NULL) { 639 warnx(cache_set_str, cache_set_err3); 640 FREE(victim, struct cache_node, 1); 641 mutex_unlock(&dupreq_lock); 642 return; 643 } 644 } 645 646 /* 647 * Store it away 648 */ 649#ifdef RPC_CACHE_DEBUG 650 if (nconf = getnetconfigent(xprt->xp_netid)) { 651 uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr); 652 freenetconfigent(nconf); 653 printf( 654 "cache set for xid= %x prog=%d vers=%d proc=%d for rmtaddr=%s\n", 655 su->su_xid, uc->uc_prog, uc->uc_vers, 656 uc->uc_proc, uaddr); 657 free(uaddr); 658 } 659#endif 660 victim->cache_replylen = replylen; 661 victim->cache_reply = rpc_buffer(xprt); 662 rpc_buffer(xprt) = newbuf; 663 xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), 664 su->su_iosz, XDR_ENCODE); 665 victim->cache_xid = su->su_xid; 666 victim->cache_proc = uc->uc_proc; 667 victim->cache_vers = uc->uc_vers; 668 victim->cache_prog = uc->uc_prog; 669 victim->cache_addr = xprt->xp_rtaddr; 670 victim->cache_addr.buf = ALLOC(char, xprt->xp_rtaddr.len); 671 (void) memcpy(victim->cache_addr.buf, xprt->xp_rtaddr.buf, 672 (size_t)xprt->xp_rtaddr.len); 673 loc = CACHE_LOC(xprt, victim->cache_xid); 674 victim->cache_next = uc->uc_entries[loc]; 675 uc->uc_entries[loc] = victim; 676 uc->uc_fifo[uc->uc_nextvictim++] = victim; 677 uc->uc_nextvictim %= uc->uc_size; 678 mutex_unlock(&dupreq_lock); 679} 680 681/* 682 * Try to get an entry from the cache 683 * return 1 if found, 0 if not found and set the stage for cache_set() 684 */ 685static int 686cache_get(xprt, msg, replyp, replylenp) 687 SVCXPRT *xprt; 688 struct rpc_msg *msg; 689 char **replyp; 690 size_t *replylenp; 691{ 692 u_int loc; 693 cache_ptr ent; 694 struct svc_dg_data *su = su_data(xprt); 695 struct cl_cache *uc = (struct cl_cache *) su->su_cache; 696#ifdef RPC_CACHE_DEBUG 697 struct netconfig *nconf; 698 char *uaddr; 699#endif 700 701 mutex_lock(&dupreq_lock); 702 loc = CACHE_LOC(xprt, su->su_xid); 703 for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) { 704 if (ent->cache_xid == su->su_xid && 705 ent->cache_proc == msg->rm_call.cb_proc && 706 ent->cache_vers == msg->rm_call.cb_vers && 707 ent->cache_prog == msg->rm_call.cb_prog && 708 ent->cache_addr.len == xprt->xp_rtaddr.len && 709 (memcmp(ent->cache_addr.buf, xprt->xp_rtaddr.buf, 710 xprt->xp_rtaddr.len) == 0)) { 711#ifdef RPC_CACHE_DEBUG 712 if (nconf = getnetconfigent(xprt->xp_netid)) { 713 uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr); 714 freenetconfigent(nconf); 715 printf( 716 "cache entry found for xid=%x prog=%d vers=%d proc=%d for rmtaddr=%s\n", 717 su->su_xid, msg->rm_call.cb_prog, 718 msg->rm_call.cb_vers, 719 msg->rm_call.cb_proc, uaddr); 720 free(uaddr); 721 } 722#endif 723 *replyp = ent->cache_reply; 724 *replylenp = ent->cache_replylen; 725 mutex_unlock(&dupreq_lock); 726 return (1); 727 } 728 } 729 /* 730 * Failed to find entry 731 * Remember a few things so we can do a set later 732 */ 733 uc->uc_proc = msg->rm_call.cb_proc; 734 uc->uc_vers = msg->rm_call.cb_vers; 735 uc->uc_prog = msg->rm_call.cb_prog; 736 mutex_unlock(&dupreq_lock); 737 return (0); 738} 739