174462Salfred/* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $ */ 274462Salfred 3261057Smav/*- 4261057Smav * Copyright (c) 2009, Sun Microsystems, Inc. 5261057Smav * All rights reserved. 6261057Smav * 7261057Smav * Redistribution and use in source and binary forms, with or without 8261057Smav * modification, are permitted provided that the following conditions are met: 9261057Smav * - Redistributions of source code must retain the above copyright notice, 10261057Smav * this list of conditions and the following disclaimer. 11261057Smav * - Redistributions in binary form must reproduce the above copyright notice, 12261057Smav * this list of conditions and the following disclaimer in the documentation 13261057Smav * and/or other materials provided with the distribution. 14261057Smav * - Neither the name of Sun Microsystems, Inc. nor the names of its 15261057Smav * contributors may be used to endorse or promote products derived 16261057Smav * from this software without specific prior written permission. 1774462Salfred * 18261057Smav * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19261057Smav * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20261057Smav * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21261057Smav * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22261057Smav * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23261057Smav * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24261057Smav * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25261057Smav * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26261057Smav * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27261057Smav * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28261057Smav * POSSIBILITY OF SUCH DAMAGE. 2974462Salfred */ 3074462Salfred 3174462Salfred/* 3274462Salfred * Copyright (c) 1986-1991 by Sun Microsystems Inc. 3374462Salfred */ 3474462Salfred 35136581Sobrien#if defined(LIBC_SCCS) && !defined(lint) 36136581Sobrien#ident "@(#)svc_dg.c 1.17 94/04/24 SMI" 37136581Sobrien#endif 3892990Sobrien#include <sys/cdefs.h> 3992990Sobrien__FBSDID("$FreeBSD$"); 4074462Salfred 4174462Salfred/* 4274462Salfred * svc_dg.c, Server side for connectionless RPC. 4374462Salfred * 4474462Salfred * Does some caching in the hopes of achieving execute-at-most-once semantics. 4574462Salfred */ 4674462Salfred 4775094Siedowse#include "namespace.h" 4874462Salfred#include "reentrant.h" 4974462Salfred#include <sys/types.h> 5074462Salfred#include <sys/socket.h> 5174462Salfred#include <rpc/rpc.h> 5274462Salfred#include <rpc/svc_dg.h> 53181344Sdfr#include <assert.h> 5474462Salfred#include <errno.h> 5574462Salfred#include <unistd.h> 5674462Salfred#include <stdio.h> 5774462Salfred#include <stdlib.h> 5874462Salfred#include <string.h> 5974462Salfred#ifdef RPC_CACHE_DEBUG 6074462Salfred#include <netconfig.h> 6174462Salfred#include <netdir.h> 6274462Salfred#endif 6374462Salfred#include <err.h> 6474462Salfred#include "un-namespace.h" 6574462Salfred 6674462Salfred#include "rpc_com.h" 67156090Sdeischen#include "mt_misc.h" 6874462Salfred 6974462Salfred#define su_data(xprt) ((struct svc_dg_data *)(xprt->xp_p2)) 7074462Salfred#define rpc_buffer(xprt) ((xprt)->xp_p1) 7174462Salfred 7274462Salfred#ifndef MAX 7374462Salfred#define MAX(a, b) (((a) > (b)) ? (a) : (b)) 7474462Salfred#endif 7574462Salfred 7692905Sobrienstatic void svc_dg_ops(SVCXPRT *); 7792905Sobrienstatic enum xprt_stat svc_dg_stat(SVCXPRT *); 7892905Sobrienstatic bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *); 7992905Sobrienstatic bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *); 8095658Sdesstatic bool_t svc_dg_getargs(SVCXPRT *, xdrproc_t, void *); 8195658Sdesstatic bool_t svc_dg_freeargs(SVCXPRT *, xdrproc_t, void *); 8292905Sobrienstatic void svc_dg_destroy(SVCXPRT *); 8392905Sobrienstatic bool_t svc_dg_control(SVCXPRT *, const u_int, void *); 8492905Sobrienstatic int cache_get(SVCXPRT *, struct rpc_msg *, char **, size_t *); 8592905Sobrienstatic void cache_set(SVCXPRT *, size_t); 8692905Sobrienint svc_dg_enablecache(SVCXPRT *, u_int); 8774462Salfred 8874462Salfred/* 8974462Salfred * Usage: 9074462Salfred * xprt = svc_dg_create(sock, sendsize, recvsize); 9174462Salfred * Does other connectionless specific initializations. 9274462Salfred * Once *xprt is initialized, it is registered. 9374462Salfred * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable 9474462Salfred * system defaults are chosen. 9574462Salfred * The routines returns NULL if a problem occurred. 9674462Salfred */ 9774462Salfredstatic const char svc_dg_str[] = "svc_dg_create: %s"; 9874462Salfredstatic const char svc_dg_err1[] = "could not get transport information"; 99194448Skanstatic const char svc_dg_err2[] = "transport does not support data transfer"; 100192913Szmlstatic const char svc_dg_err3[] = "getsockname failed"; 101194448Skanstatic const char svc_dg_err4[] = "cannot set IP_RECVDSTADDR"; 10274462Salfredstatic const char __no_mem_str[] = "out of memory"; 10374462Salfred 10474462SalfredSVCXPRT * 10574462Salfredsvc_dg_create(fd, sendsize, recvsize) 10674462Salfred int fd; 10774462Salfred u_int sendsize; 10874462Salfred u_int recvsize; 10974462Salfred{ 11074462Salfred SVCXPRT *xprt; 11174462Salfred struct svc_dg_data *su = NULL; 11274462Salfred struct __rpc_sockinfo si; 11374462Salfred struct sockaddr_storage ss; 11474462Salfred socklen_t slen; 11574462Salfred 11674462Salfred if (!__rpc_fd2sockinfo(fd, &si)) { 11774462Salfred warnx(svc_dg_str, svc_dg_err1); 11874462Salfred return (NULL); 11974462Salfred } 12074462Salfred /* 12174462Salfred * Find the receive and the send size 12274462Salfred */ 12374462Salfred sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 12474462Salfred recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 12574462Salfred if ((sendsize == 0) || (recvsize == 0)) { 12674462Salfred warnx(svc_dg_str, svc_dg_err2); 12774462Salfred return (NULL); 12874462Salfred } 12974462Salfred 130181344Sdfr xprt = svc_xprt_alloc(); 13174462Salfred if (xprt == NULL) 13274462Salfred goto freedata; 13374462Salfred 13474462Salfred su = mem_alloc(sizeof (*su)); 13574462Salfred if (su == NULL) 13674462Salfred goto freedata; 13774462Salfred su->su_iosz = ((MAX(sendsize, recvsize) + 3) / 4) * 4; 13874462Salfred if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL) 13974462Salfred goto freedata; 14074462Salfred xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, 14174462Salfred XDR_DECODE); 14274462Salfred su->su_cache = NULL; 14374462Salfred xprt->xp_fd = fd; 14495658Sdes xprt->xp_p2 = su; 14574462Salfred xprt->xp_verf.oa_base = su->su_verfbody; 14674462Salfred svc_dg_ops(xprt); 14774462Salfred xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage); 14874462Salfred 14974462Salfred slen = sizeof ss; 150192913Szml if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) { 151192913Szml warnx(svc_dg_str, svc_dg_err3); 152192913Szml goto freedata_nowarn; 153192913Szml } 15474462Salfred xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage)); 15574462Salfred xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage); 15674462Salfred xprt->xp_ltaddr.len = slen; 15774462Salfred memcpy(xprt->xp_ltaddr.buf, &ss, slen); 15874462Salfred 159194448Skan if (ss.ss_family == AF_INET) { 160194448Skan struct sockaddr_in *sin; 161194448Skan static const int true_value = 1; 162194448Skan 163194448Skan sin = (struct sockaddr_in *)(void *)&ss; 164194448Skan if (sin->sin_addr.s_addr == INADDR_ANY) { 165194448Skan su->su_srcaddr.buf = mem_alloc(sizeof (ss)); 166194448Skan su->su_srcaddr.maxlen = sizeof (ss); 167194448Skan 168194448Skan if (_setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, 169194448Skan &true_value, sizeof(true_value))) { 170194448Skan warnx(svc_dg_str, svc_dg_err4); 171194448Skan goto freedata_nowarn; 172194448Skan } 173194448Skan } 174194448Skan } 175194448Skan 17674462Salfred xprt_register(xprt); 17774462Salfred return (xprt); 17874462Salfredfreedata: 17974462Salfred (void) warnx(svc_dg_str, __no_mem_str); 180192913Szmlfreedata_nowarn: 18174462Salfred if (xprt) { 18274462Salfred if (su) 18374462Salfred (void) mem_free(su, sizeof (*su)); 184181344Sdfr svc_xprt_free(xprt); 18574462Salfred } 18674462Salfred return (NULL); 18774462Salfred} 18874462Salfred 18974462Salfred/*ARGSUSED*/ 19074462Salfredstatic enum xprt_stat 19174462Salfredsvc_dg_stat(xprt) 19274462Salfred SVCXPRT *xprt; 19374462Salfred{ 19474462Salfred return (XPRT_IDLE); 19574462Salfred} 19674462Salfred 197192913Szmlstatic int 198192913Szmlsvc_dg_recvfrom(int fd, char *buf, int buflen, 199192913Szml struct sockaddr *raddr, socklen_t *raddrlen, 200192913Szml struct sockaddr *laddr, socklen_t *laddrlen) 201192913Szml{ 202192913Szml struct msghdr msg; 203192913Szml struct iovec msg_iov[1]; 204192913Szml struct sockaddr_in *lin = (struct sockaddr_in *)laddr; 205192913Szml int rlen; 206192913Szml bool_t have_lin = FALSE; 207192913Szml char tmp[CMSG_LEN(sizeof(*lin))]; 208192913Szml struct cmsghdr *cmsg; 209192913Szml 210192913Szml memset((char *)&msg, 0, sizeof(msg)); 211192913Szml msg_iov[0].iov_base = buf; 212192913Szml msg_iov[0].iov_len = buflen; 213192913Szml msg.msg_iov = msg_iov; 214192913Szml msg.msg_iovlen = 1; 215192913Szml msg.msg_namelen = *raddrlen; 216192913Szml msg.msg_name = (char *)raddr; 217194448Skan if (laddr != NULL) { 218194448Skan msg.msg_control = (caddr_t)tmp; 219194448Skan msg.msg_controllen = CMSG_LEN(sizeof(*lin)); 220194448Skan } 221192913Szml rlen = _recvmsg(fd, &msg, 0); 222192913Szml if (rlen >= 0) 223192913Szml *raddrlen = msg.msg_namelen; 224192913Szml 225194448Skan if (rlen == -1 || laddr == NULL || 226192913Szml msg.msg_controllen < sizeof(struct cmsghdr) || 227192913Szml msg.msg_flags & MSG_CTRUNC) 228192913Szml return rlen; 229192913Szml 230192913Szml for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; 231193677Skan cmsg = CMSG_NXTHDR(&msg, cmsg)) { 232192913Szml if (cmsg->cmsg_level == IPPROTO_IP && 233192913Szml cmsg->cmsg_type == IP_RECVDSTADDR) { 234192913Szml have_lin = TRUE; 235192913Szml memcpy(&lin->sin_addr, 236194448Skan (struct in_addr *)CMSG_DATA(cmsg), 237194448Skan sizeof(struct in_addr)); 238192913Szml break; 239192913Szml } 240192913Szml } 241192913Szml 242192913Szml lin->sin_family = AF_INET; 243192913Szml lin->sin_port = 0; 244192913Szml *laddrlen = sizeof(struct sockaddr_in); 245192913Szml 246194448Skan if (!have_lin) 247194448Skan lin->sin_addr.s_addr = INADDR_ANY; 248194448Skan 249192913Szml return rlen; 250192913Szml} 251192913Szml 25274462Salfredstatic bool_t 25374462Salfredsvc_dg_recv(xprt, msg) 25474462Salfred SVCXPRT *xprt; 25574462Salfred struct rpc_msg *msg; 25674462Salfred{ 25774462Salfred struct svc_dg_data *su = su_data(xprt); 25874462Salfred XDR *xdrs = &(su->su_xdrs); 25974462Salfred char *reply; 26074462Salfred struct sockaddr_storage ss; 26174462Salfred socklen_t alen; 26274462Salfred size_t replylen; 263109957Smbr ssize_t rlen; 26474462Salfred 26574462Salfredagain: 26674462Salfred alen = sizeof (struct sockaddr_storage); 267192913Szml rlen = svc_dg_recvfrom(xprt->xp_fd, rpc_buffer(xprt), su->su_iosz, 268192913Szml (struct sockaddr *)(void *)&ss, &alen, 269194448Skan (struct sockaddr *)su->su_srcaddr.buf, &su->su_srcaddr.len); 27074462Salfred if (rlen == -1 && errno == EINTR) 27174462Salfred goto again; 272109957Smbr if (rlen == -1 || (rlen < (ssize_t)(4 * sizeof (u_int32_t)))) 27374462Salfred return (FALSE); 27474462Salfred if (xprt->xp_rtaddr.len < alen) { 27574462Salfred if (xprt->xp_rtaddr.len != 0) 27674462Salfred mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.len); 27774462Salfred xprt->xp_rtaddr.buf = mem_alloc(alen); 27874462Salfred xprt->xp_rtaddr.len = alen; 27974462Salfred } 28074462Salfred memcpy(xprt->xp_rtaddr.buf, &ss, alen); 28174462Salfred#ifdef PORTMAP 28274462Salfred if (ss.ss_family == AF_INET) { 28374462Salfred xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf; 28474462Salfred xprt->xp_addrlen = sizeof (struct sockaddr_in); 28574462Salfred } 28674462Salfred#endif /* PORTMAP */ 28774462Salfred xdrs->x_op = XDR_DECODE; 28874462Salfred XDR_SETPOS(xdrs, 0); 28974462Salfred if (! xdr_callmsg(xdrs, msg)) { 29074462Salfred return (FALSE); 29174462Salfred } 29274462Salfred su->su_xid = msg->rm_xid; 29374462Salfred if (su->su_cache != NULL) { 29474462Salfred if (cache_get(xprt, msg, &reply, &replylen)) { 29574462Salfred (void)_sendto(xprt->xp_fd, reply, replylen, 0, 29674462Salfred (struct sockaddr *)(void *)&ss, alen); 29774462Salfred return (FALSE); 29874462Salfred } 29974462Salfred } 30074462Salfred return (TRUE); 30174462Salfred} 30274462Salfred 303192913Szmlstatic int 304192913Szmlsvc_dg_sendto(int fd, char *buf, int buflen, 305192913Szml const struct sockaddr *raddr, socklen_t raddrlen, 306192913Szml const struct sockaddr *laddr, socklen_t laddrlen) 307192913Szml{ 308192913Szml struct msghdr msg; 309192913Szml struct iovec msg_iov[1]; 310192913Szml struct sockaddr_in *laddr_in = (struct sockaddr_in *)laddr; 311192913Szml struct in_addr *lin = &laddr_in->sin_addr; 312192913Szml char tmp[CMSG_SPACE(sizeof(*lin))]; 313192913Szml struct cmsghdr *cmsg; 314192913Szml 315192913Szml memset((char *)&msg, 0, sizeof(msg)); 316192913Szml msg_iov[0].iov_base = buf; 317192913Szml msg_iov[0].iov_len = buflen; 318192913Szml msg.msg_iov = msg_iov; 319192913Szml msg.msg_iovlen = 1; 320192913Szml msg.msg_namelen = raddrlen; 321192913Szml msg.msg_name = (char *)raddr; 322192913Szml 323194448Skan if (laddr != NULL && laddr->sa_family == AF_INET && 324194448Skan lin->s_addr != INADDR_ANY) { 325192913Szml msg.msg_control = (caddr_t)tmp; 326192913Szml msg.msg_controllen = CMSG_LEN(sizeof(*lin)); 327192913Szml cmsg = CMSG_FIRSTHDR(&msg); 328192913Szml cmsg->cmsg_len = CMSG_LEN(sizeof(*lin)); 329192913Szml cmsg->cmsg_level = IPPROTO_IP; 330192913Szml cmsg->cmsg_type = IP_SENDSRCADDR; 331192913Szml memcpy(CMSG_DATA(cmsg), lin, sizeof(*lin)); 332192913Szml } 333192913Szml 334192913Szml return _sendmsg(fd, &msg, 0); 335192913Szml} 336192913Szml 33774462Salfredstatic bool_t 33874462Salfredsvc_dg_reply(xprt, msg) 33974462Salfred SVCXPRT *xprt; 34074462Salfred struct rpc_msg *msg; 34174462Salfred{ 34274462Salfred struct svc_dg_data *su = su_data(xprt); 34374462Salfred XDR *xdrs = &(su->su_xdrs); 344181344Sdfr bool_t stat = TRUE; 34574462Salfred size_t slen; 346181344Sdfr xdrproc_t xdr_proc; 347181344Sdfr caddr_t xdr_where; 34874462Salfred 34974462Salfred xdrs->x_op = XDR_ENCODE; 35074462Salfred XDR_SETPOS(xdrs, 0); 35174462Salfred msg->rm_xid = su->su_xid; 352181344Sdfr if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 353181344Sdfr msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 354181344Sdfr xdr_proc = msg->acpted_rply.ar_results.proc; 355181344Sdfr xdr_where = msg->acpted_rply.ar_results.where; 356181344Sdfr msg->acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; 357181344Sdfr msg->acpted_rply.ar_results.where = NULL; 358181344Sdfr 359181344Sdfr if (!xdr_replymsg(xdrs, msg) || 360181344Sdfr !SVCAUTH_WRAP(&SVC_AUTH(xprt), xdrs, xdr_proc, xdr_where)) 361181344Sdfr stat = FALSE; 362181344Sdfr } else { 363181344Sdfr stat = xdr_replymsg(xdrs, msg); 364181344Sdfr } 365181344Sdfr if (stat) { 36674462Salfred slen = XDR_GETPOS(xdrs); 367192913Szml if (svc_dg_sendto(xprt->xp_fd, rpc_buffer(xprt), slen, 36874462Salfred (struct sockaddr *)xprt->xp_rtaddr.buf, 369192913Szml (socklen_t)xprt->xp_rtaddr.len, 370194448Skan (struct sockaddr *)su->su_srcaddr.buf, 371194448Skan (socklen_t)su->su_srcaddr.len) == (ssize_t) slen) { 37274462Salfred stat = TRUE; 37374462Salfred if (su->su_cache) 37474462Salfred cache_set(xprt, slen); 37574462Salfred } 37674462Salfred } 37774462Salfred return (stat); 37874462Salfred} 37974462Salfred 38074462Salfredstatic bool_t 38174462Salfredsvc_dg_getargs(xprt, xdr_args, args_ptr) 38274462Salfred SVCXPRT *xprt; 38374462Salfred xdrproc_t xdr_args; 38495658Sdes void *args_ptr; 38574462Salfred{ 386181344Sdfr struct svc_dg_data *su; 387181344Sdfr 388181344Sdfr assert(xprt != NULL); 389181344Sdfr su = su_data(xprt); 390181344Sdfr return (SVCAUTH_UNWRAP(&SVC_AUTH(xprt), 391181344Sdfr &su->su_xdrs, xdr_args, args_ptr)); 39274462Salfred} 39374462Salfred 39474462Salfredstatic bool_t 39574462Salfredsvc_dg_freeargs(xprt, xdr_args, args_ptr) 39674462Salfred SVCXPRT *xprt; 39774462Salfred xdrproc_t xdr_args; 39895658Sdes void *args_ptr; 39974462Salfred{ 40074462Salfred XDR *xdrs = &(su_data(xprt)->su_xdrs); 40174462Salfred 40274462Salfred xdrs->x_op = XDR_FREE; 40374462Salfred return (*xdr_args)(xdrs, args_ptr); 40474462Salfred} 40574462Salfred 40674462Salfredstatic void 40774462Salfredsvc_dg_destroy(xprt) 40874462Salfred SVCXPRT *xprt; 40974462Salfred{ 41074462Salfred struct svc_dg_data *su = su_data(xprt); 41174462Salfred 41274462Salfred xprt_unregister(xprt); 41374462Salfred if (xprt->xp_fd != -1) 41474462Salfred (void)_close(xprt->xp_fd); 41574462Salfred XDR_DESTROY(&(su->su_xdrs)); 41674462Salfred (void) mem_free(rpc_buffer(xprt), su->su_iosz); 417194448Skan if (su->su_srcaddr.buf) 418194448Skan (void) mem_free(su->su_srcaddr.buf, su->su_srcaddr.maxlen); 41974462Salfred (void) mem_free(su, sizeof (*su)); 42074462Salfred if (xprt->xp_rtaddr.buf) 42174462Salfred (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen); 42274462Salfred if (xprt->xp_ltaddr.buf) 42374462Salfred (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen); 42474462Salfred if (xprt->xp_tp) 42574462Salfred (void) free(xprt->xp_tp); 426181344Sdfr svc_xprt_free(xprt); 42774462Salfred} 42874462Salfred 42974462Salfredstatic bool_t 43074462Salfred/*ARGSUSED*/ 43174462Salfredsvc_dg_control(xprt, rq, in) 43274462Salfred SVCXPRT *xprt; 43374462Salfred const u_int rq; 43474462Salfred void *in; 43574462Salfred{ 43674462Salfred return (FALSE); 43774462Salfred} 43874462Salfred 43974462Salfredstatic void 44074462Salfredsvc_dg_ops(xprt) 44174462Salfred SVCXPRT *xprt; 44274462Salfred{ 44374462Salfred static struct xp_ops ops; 44474462Salfred static struct xp_ops2 ops2; 44574462Salfred 44674462Salfred/* VARIABLES PROTECTED BY ops_lock: ops */ 44774462Salfred 44874462Salfred mutex_lock(&ops_lock); 44974462Salfred if (ops.xp_recv == NULL) { 45074462Salfred ops.xp_recv = svc_dg_recv; 45174462Salfred ops.xp_stat = svc_dg_stat; 45274462Salfred ops.xp_getargs = svc_dg_getargs; 45374462Salfred ops.xp_reply = svc_dg_reply; 45474462Salfred ops.xp_freeargs = svc_dg_freeargs; 45574462Salfred ops.xp_destroy = svc_dg_destroy; 45674462Salfred ops2.xp_control = svc_dg_control; 45774462Salfred } 45874462Salfred xprt->xp_ops = &ops; 45974462Salfred xprt->xp_ops2 = &ops2; 46074462Salfred mutex_unlock(&ops_lock); 46174462Salfred} 46274462Salfred 46374462Salfred/* The CACHING COMPONENT */ 46474462Salfred 46574462Salfred/* 46674462Salfred * Could have been a separate file, but some part of it depends upon the 46774462Salfred * private structure of the client handle. 46874462Salfred * 46974462Salfred * Fifo cache for cl server 47074462Salfred * Copies pointers to reply buffers into fifo cache 47174462Salfred * Buffers are sent again if retransmissions are detected. 47274462Salfred */ 47374462Salfred 47474462Salfred#define SPARSENESS 4 /* 75% sparse */ 47574462Salfred 47674462Salfred#define ALLOC(type, size) \ 47774462Salfred (type *) mem_alloc((sizeof (type) * (size))) 47874462Salfred 47974462Salfred#define MEMZERO(addr, type, size) \ 48074462Salfred (void) memset((void *) (addr), 0, sizeof (type) * (int) (size)) 48174462Salfred 48274462Salfred#define FREE(addr, type, size) \ 48374462Salfred mem_free((addr), (sizeof (type) * (size))) 48474462Salfred 48574462Salfred/* 48674462Salfred * An entry in the cache 48774462Salfred */ 48874462Salfredtypedef struct cache_node *cache_ptr; 48974462Salfredstruct cache_node { 49074462Salfred /* 49174462Salfred * Index into cache is xid, proc, vers, prog and address 49274462Salfred */ 49374462Salfred u_int32_t cache_xid; 49474462Salfred rpcproc_t cache_proc; 49574462Salfred rpcvers_t cache_vers; 49674462Salfred rpcprog_t cache_prog; 49774462Salfred struct netbuf cache_addr; 49874462Salfred /* 49974462Salfred * The cached reply and length 50074462Salfred */ 50174462Salfred char *cache_reply; 50274462Salfred size_t cache_replylen; 50374462Salfred /* 50474462Salfred * Next node on the list, if there is a collision 50574462Salfred */ 50674462Salfred cache_ptr cache_next; 50774462Salfred}; 50874462Salfred 50974462Salfred/* 51074462Salfred * The entire cache 51174462Salfred */ 51274462Salfredstruct cl_cache { 51374462Salfred u_int uc_size; /* size of cache */ 51474462Salfred cache_ptr *uc_entries; /* hash table of entries in cache */ 51574462Salfred cache_ptr *uc_fifo; /* fifo list of entries in cache */ 51674462Salfred u_int uc_nextvictim; /* points to next victim in fifo list */ 51774462Salfred rpcprog_t uc_prog; /* saved program number */ 51874462Salfred rpcvers_t uc_vers; /* saved version number */ 51974462Salfred rpcproc_t uc_proc; /* saved procedure number */ 52074462Salfred}; 52174462Salfred 52274462Salfred 52374462Salfred/* 52474462Salfred * the hashing function 52574462Salfred */ 52674462Salfred#define CACHE_LOC(transp, xid) \ 52774462Salfred (xid % (SPARSENESS * ((struct cl_cache *) \ 52874462Salfred su_data(transp)->su_cache)->uc_size)) 52974462Salfred 53074462Salfred/* 53174462Salfred * Enable use of the cache. Returns 1 on success, 0 on failure. 53274462Salfred * Note: there is no disable. 53374462Salfred */ 53474462Salfredstatic const char cache_enable_str[] = "svc_enablecache: %s %s"; 53574462Salfredstatic const char alloc_err[] = "could not allocate cache "; 53674462Salfredstatic const char enable_err[] = "cache already enabled"; 53774462Salfred 53874462Salfredint 53974462Salfredsvc_dg_enablecache(transp, size) 54074462Salfred SVCXPRT *transp; 54174462Salfred u_int size; 54274462Salfred{ 54374462Salfred struct svc_dg_data *su = su_data(transp); 54474462Salfred struct cl_cache *uc; 54574462Salfred 54674462Salfred mutex_lock(&dupreq_lock); 54774462Salfred if (su->su_cache != NULL) { 54874462Salfred (void) warnx(cache_enable_str, enable_err, " "); 54974462Salfred mutex_unlock(&dupreq_lock); 55074462Salfred return (0); 55174462Salfred } 55274462Salfred uc = ALLOC(struct cl_cache, 1); 55374462Salfred if (uc == NULL) { 55474462Salfred warnx(cache_enable_str, alloc_err, " "); 55574462Salfred mutex_unlock(&dupreq_lock); 55674462Salfred return (0); 55774462Salfred } 55874462Salfred uc->uc_size = size; 55974462Salfred uc->uc_nextvictim = 0; 56074462Salfred uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS); 56174462Salfred if (uc->uc_entries == NULL) { 56274462Salfred warnx(cache_enable_str, alloc_err, "data"); 56374462Salfred FREE(uc, struct cl_cache, 1); 56474462Salfred mutex_unlock(&dupreq_lock); 56574462Salfred return (0); 56674462Salfred } 56774462Salfred MEMZERO(uc->uc_entries, cache_ptr, size * SPARSENESS); 56874462Salfred uc->uc_fifo = ALLOC(cache_ptr, size); 56974462Salfred if (uc->uc_fifo == NULL) { 57074462Salfred warnx(cache_enable_str, alloc_err, "fifo"); 57174462Salfred FREE(uc->uc_entries, cache_ptr, size * SPARSENESS); 57274462Salfred FREE(uc, struct cl_cache, 1); 57374462Salfred mutex_unlock(&dupreq_lock); 57474462Salfred return (0); 57574462Salfred } 57674462Salfred MEMZERO(uc->uc_fifo, cache_ptr, size); 57774462Salfred su->su_cache = (char *)(void *)uc; 57874462Salfred mutex_unlock(&dupreq_lock); 57974462Salfred return (1); 58074462Salfred} 58174462Salfred 58274462Salfred/* 58374462Salfred * Set an entry in the cache. It assumes that the uc entry is set from 58474462Salfred * the earlier call to cache_get() for the same procedure. This will always 58574462Salfred * happen because cache_get() is calle by svc_dg_recv and cache_set() is called 58674462Salfred * by svc_dg_reply(). All this hoopla because the right RPC parameters are 58774462Salfred * not available at svc_dg_reply time. 58874462Salfred */ 58974462Salfred 59074462Salfredstatic const char cache_set_str[] = "cache_set: %s"; 59174462Salfredstatic const char cache_set_err1[] = "victim not found"; 59274462Salfredstatic const char cache_set_err2[] = "victim alloc failed"; 59374462Salfredstatic const char cache_set_err3[] = "could not allocate new rpc buffer"; 59474462Salfred 59574462Salfredstatic void 59674462Salfredcache_set(xprt, replylen) 59774462Salfred SVCXPRT *xprt; 59874462Salfred size_t replylen; 59974462Salfred{ 60074462Salfred cache_ptr victim; 60174462Salfred cache_ptr *vicp; 60274462Salfred struct svc_dg_data *su = su_data(xprt); 60374462Salfred struct cl_cache *uc = (struct cl_cache *) su->su_cache; 60474462Salfred u_int loc; 60574462Salfred char *newbuf; 60674462Salfred#ifdef RPC_CACHE_DEBUG 60774462Salfred struct netconfig *nconf; 60874462Salfred char *uaddr; 60974462Salfred#endif 61074462Salfred 61174462Salfred mutex_lock(&dupreq_lock); 61274462Salfred /* 61374462Salfred * Find space for the new entry, either by 61474462Salfred * reusing an old entry, or by mallocing a new one 61574462Salfred */ 61674462Salfred victim = uc->uc_fifo[uc->uc_nextvictim]; 61774462Salfred if (victim != NULL) { 61874462Salfred loc = CACHE_LOC(xprt, victim->cache_xid); 61974462Salfred for (vicp = &uc->uc_entries[loc]; 62074462Salfred *vicp != NULL && *vicp != victim; 62174462Salfred vicp = &(*vicp)->cache_next) 62274462Salfred ; 62374462Salfred if (*vicp == NULL) { 62474462Salfred warnx(cache_set_str, cache_set_err1); 62574462Salfred mutex_unlock(&dupreq_lock); 62674462Salfred return; 62774462Salfred } 62874462Salfred *vicp = victim->cache_next; /* remove from cache */ 62974462Salfred newbuf = victim->cache_reply; 63074462Salfred } else { 63174462Salfred victim = ALLOC(struct cache_node, 1); 63274462Salfred if (victim == NULL) { 63374462Salfred warnx(cache_set_str, cache_set_err2); 63474462Salfred mutex_unlock(&dupreq_lock); 63574462Salfred return; 63674462Salfred } 63774462Salfred newbuf = mem_alloc(su->su_iosz); 63874462Salfred if (newbuf == NULL) { 63974462Salfred warnx(cache_set_str, cache_set_err3); 64074462Salfred FREE(victim, struct cache_node, 1); 64174462Salfred mutex_unlock(&dupreq_lock); 64274462Salfred return; 64374462Salfred } 64474462Salfred } 64574462Salfred 64674462Salfred /* 64774462Salfred * Store it away 64874462Salfred */ 64974462Salfred#ifdef RPC_CACHE_DEBUG 65074462Salfred if (nconf = getnetconfigent(xprt->xp_netid)) { 65174462Salfred uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr); 65274462Salfred freenetconfigent(nconf); 65374462Salfred printf( 65474462Salfred "cache set for xid= %x prog=%d vers=%d proc=%d for rmtaddr=%s\n", 65574462Salfred su->su_xid, uc->uc_prog, uc->uc_vers, 65674462Salfred uc->uc_proc, uaddr); 65774462Salfred free(uaddr); 65874462Salfred } 65974462Salfred#endif 66074462Salfred victim->cache_replylen = replylen; 66174462Salfred victim->cache_reply = rpc_buffer(xprt); 66274462Salfred rpc_buffer(xprt) = newbuf; 66374462Salfred xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), 66474462Salfred su->su_iosz, XDR_ENCODE); 66574462Salfred victim->cache_xid = su->su_xid; 66674462Salfred victim->cache_proc = uc->uc_proc; 66774462Salfred victim->cache_vers = uc->uc_vers; 66874462Salfred victim->cache_prog = uc->uc_prog; 66974462Salfred victim->cache_addr = xprt->xp_rtaddr; 67074462Salfred victim->cache_addr.buf = ALLOC(char, xprt->xp_rtaddr.len); 67174462Salfred (void) memcpy(victim->cache_addr.buf, xprt->xp_rtaddr.buf, 67274462Salfred (size_t)xprt->xp_rtaddr.len); 67374462Salfred loc = CACHE_LOC(xprt, victim->cache_xid); 67474462Salfred victim->cache_next = uc->uc_entries[loc]; 67574462Salfred uc->uc_entries[loc] = victim; 67674462Salfred uc->uc_fifo[uc->uc_nextvictim++] = victim; 67774462Salfred uc->uc_nextvictim %= uc->uc_size; 67874462Salfred mutex_unlock(&dupreq_lock); 67974462Salfred} 68074462Salfred 68174462Salfred/* 68274462Salfred * Try to get an entry from the cache 68374462Salfred * return 1 if found, 0 if not found and set the stage for cache_set() 68474462Salfred */ 68574462Salfredstatic int 68674462Salfredcache_get(xprt, msg, replyp, replylenp) 68774462Salfred SVCXPRT *xprt; 68874462Salfred struct rpc_msg *msg; 68974462Salfred char **replyp; 69074462Salfred size_t *replylenp; 69174462Salfred{ 69274462Salfred u_int loc; 69374462Salfred cache_ptr ent; 69474462Salfred struct svc_dg_data *su = su_data(xprt); 69574462Salfred struct cl_cache *uc = (struct cl_cache *) su->su_cache; 69674462Salfred#ifdef RPC_CACHE_DEBUG 69774462Salfred struct netconfig *nconf; 69874462Salfred char *uaddr; 69974462Salfred#endif 70074462Salfred 70174462Salfred mutex_lock(&dupreq_lock); 70274462Salfred loc = CACHE_LOC(xprt, su->su_xid); 70374462Salfred for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) { 70474462Salfred if (ent->cache_xid == su->su_xid && 70574462Salfred ent->cache_proc == msg->rm_call.cb_proc && 70674462Salfred ent->cache_vers == msg->rm_call.cb_vers && 70774462Salfred ent->cache_prog == msg->rm_call.cb_prog && 70874462Salfred ent->cache_addr.len == xprt->xp_rtaddr.len && 70974462Salfred (memcmp(ent->cache_addr.buf, xprt->xp_rtaddr.buf, 71074462Salfred xprt->xp_rtaddr.len) == 0)) { 71174462Salfred#ifdef RPC_CACHE_DEBUG 71274462Salfred if (nconf = getnetconfigent(xprt->xp_netid)) { 71374462Salfred uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr); 71474462Salfred freenetconfigent(nconf); 71574462Salfred printf( 71674462Salfred "cache entry found for xid=%x prog=%d vers=%d proc=%d for rmtaddr=%s\n", 71774462Salfred su->su_xid, msg->rm_call.cb_prog, 71874462Salfred msg->rm_call.cb_vers, 71974462Salfred msg->rm_call.cb_proc, uaddr); 72074462Salfred free(uaddr); 72174462Salfred } 72274462Salfred#endif 72374462Salfred *replyp = ent->cache_reply; 72474462Salfred *replylenp = ent->cache_replylen; 72574462Salfred mutex_unlock(&dupreq_lock); 72674462Salfred return (1); 72774462Salfred } 72874462Salfred } 72974462Salfred /* 73074462Salfred * Failed to find entry 73174462Salfred * Remember a few things so we can do a set later 73274462Salfred */ 73374462Salfred uc->uc_proc = msg->rm_call.cb_proc; 73474462Salfred uc->uc_vers = msg->rm_call.cb_vers; 73574462Salfred uc->uc_prog = msg->rm_call.cb_prog; 73674462Salfred mutex_unlock(&dupreq_lock); 73774462Salfred return (0); 73874462Salfred} 739