174462Salfred/* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $ */ 274462Salfred 374462Salfred/* 474462Salfred * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 574462Salfred * unrestricted use provided that this legend is included on all tape 674462Salfred * media and as a part of the software program in whole or part. Users 774462Salfred * may copy or modify Sun RPC without charge, but are not authorized 874462Salfred * to license or distribute it to anyone else except as part of a product or 974462Salfred * program developed by the user. 1074462Salfred * 1174462Salfred * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 1274462Salfred * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 1374462Salfred * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 1474462Salfred * 1574462Salfred * Sun RPC is provided with no support and without any obligation on the 1674462Salfred * part of Sun Microsystems, Inc. to assist in its use, correction, 1774462Salfred * modification or enhancement. 1874462Salfred * 1974462Salfred * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 2074462Salfred * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 2174462Salfred * OR ANY PART THEREOF. 2274462Salfred * 2374462Salfred * In no event will Sun Microsystems, Inc. be liable for any lost revenue 2474462Salfred * or profits or other special, indirect and consequential damages, even if 2574462Salfred * Sun has been advised of the possibility of such damages. 2674462Salfred * 2774462Salfred * Sun Microsystems, Inc. 2874462Salfred * 2550 Garcia Avenue 2974462Salfred * Mountain View, California 94043 3074462Salfred */ 3174462Salfred 3274462Salfred/* 3374462Salfred * Copyright (c) 1986-1991 by Sun Microsystems Inc. 3474462Salfred */ 3574462Salfred 36136581Sobrien#if defined(LIBC_SCCS) && !defined(lint) 37136581Sobrien#ident "@(#)svc_dg.c 1.17 94/04/24 SMI" 38136581Sobrien#endif 3992990Sobrien#include <sys/cdefs.h> 4092990Sobrien__FBSDID("$FreeBSD$"); 4174462Salfred 4274462Salfred/* 4374462Salfred * svc_dg.c, Server side for connectionless RPC. 4474462Salfred * 4574462Salfred * Does some caching in the hopes of achieving execute-at-most-once semantics. 4674462Salfred */ 4774462Salfred 4875094Siedowse#include "namespace.h" 4974462Salfred#include "reentrant.h" 5074462Salfred#include <sys/types.h> 5174462Salfred#include <sys/socket.h> 5274462Salfred#include <rpc/rpc.h> 5374462Salfred#include <rpc/svc_dg.h> 54181344Sdfr#include <assert.h> 5574462Salfred#include <errno.h> 5674462Salfred#include <unistd.h> 5774462Salfred#include <stdio.h> 5874462Salfred#include <stdlib.h> 5974462Salfred#include <string.h> 6074462Salfred#ifdef RPC_CACHE_DEBUG 6174462Salfred#include <netconfig.h> 6274462Salfred#include <netdir.h> 6374462Salfred#endif 6474462Salfred#include <err.h> 6574462Salfred#include "un-namespace.h" 6674462Salfred 6774462Salfred#include "rpc_com.h" 68156090Sdeischen#include "mt_misc.h" 6974462Salfred 7074462Salfred#define su_data(xprt) ((struct svc_dg_data *)(xprt->xp_p2)) 7174462Salfred#define rpc_buffer(xprt) ((xprt)->xp_p1) 7274462Salfred 7374462Salfred#ifndef MAX 7474462Salfred#define MAX(a, b) (((a) > (b)) ? (a) : (b)) 7574462Salfred#endif 7674462Salfred 7792905Sobrienstatic void svc_dg_ops(SVCXPRT *); 7892905Sobrienstatic enum xprt_stat svc_dg_stat(SVCXPRT *); 7992905Sobrienstatic bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *); 8092905Sobrienstatic bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *); 8195658Sdesstatic bool_t svc_dg_getargs(SVCXPRT *, xdrproc_t, void *); 8295658Sdesstatic bool_t svc_dg_freeargs(SVCXPRT *, xdrproc_t, void *); 8392905Sobrienstatic void svc_dg_destroy(SVCXPRT *); 8492905Sobrienstatic bool_t svc_dg_control(SVCXPRT *, const u_int, void *); 8592905Sobrienstatic int cache_get(SVCXPRT *, struct rpc_msg *, char **, size_t *); 8692905Sobrienstatic void cache_set(SVCXPRT *, size_t); 8792905Sobrienint svc_dg_enablecache(SVCXPRT *, u_int); 8874462Salfred 8974462Salfred/* 9074462Salfred * Usage: 9174462Salfred * xprt = svc_dg_create(sock, sendsize, recvsize); 9274462Salfred * Does other connectionless specific initializations. 9374462Salfred * Once *xprt is initialized, it is registered. 9474462Salfred * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable 9574462Salfred * system defaults are chosen. 9674462Salfred * The routines returns NULL if a problem occurred. 9774462Salfred */ 9874462Salfredstatic const char svc_dg_str[] = "svc_dg_create: %s"; 9974462Salfredstatic const char svc_dg_err1[] = "could not get transport information"; 100194448Skanstatic const char svc_dg_err2[] = "transport does not support data transfer"; 101192913Szmlstatic const char svc_dg_err3[] = "getsockname failed"; 102194448Skanstatic const char svc_dg_err4[] = "cannot set IP_RECVDSTADDR"; 10374462Salfredstatic const char __no_mem_str[] = "out of memory"; 10474462Salfred 10574462SalfredSVCXPRT * 10674462Salfredsvc_dg_create(fd, sendsize, recvsize) 10774462Salfred int fd; 10874462Salfred u_int sendsize; 10974462Salfred u_int recvsize; 11074462Salfred{ 11174462Salfred SVCXPRT *xprt; 11274462Salfred struct svc_dg_data *su = NULL; 11374462Salfred struct __rpc_sockinfo si; 11474462Salfred struct sockaddr_storage ss; 11574462Salfred socklen_t slen; 11674462Salfred 11774462Salfred if (!__rpc_fd2sockinfo(fd, &si)) { 11874462Salfred warnx(svc_dg_str, svc_dg_err1); 11974462Salfred return (NULL); 12074462Salfred } 12174462Salfred /* 12274462Salfred * Find the receive and the send size 12374462Salfred */ 12474462Salfred sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 12574462Salfred recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 12674462Salfred if ((sendsize == 0) || (recvsize == 0)) { 12774462Salfred warnx(svc_dg_str, svc_dg_err2); 12874462Salfred return (NULL); 12974462Salfred } 13074462Salfred 131181344Sdfr xprt = svc_xprt_alloc(); 13274462Salfred if (xprt == NULL) 13374462Salfred goto freedata; 13474462Salfred 13574462Salfred su = mem_alloc(sizeof (*su)); 13674462Salfred if (su == NULL) 13774462Salfred goto freedata; 13874462Salfred su->su_iosz = ((MAX(sendsize, recvsize) + 3) / 4) * 4; 13974462Salfred if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL) 14074462Salfred goto freedata; 14174462Salfred xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, 14274462Salfred XDR_DECODE); 14374462Salfred su->su_cache = NULL; 14474462Salfred xprt->xp_fd = fd; 14595658Sdes xprt->xp_p2 = su; 14674462Salfred xprt->xp_verf.oa_base = su->su_verfbody; 14774462Salfred svc_dg_ops(xprt); 14874462Salfred xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage); 14974462Salfred 15074462Salfred slen = sizeof ss; 151192913Szml if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) { 152192913Szml warnx(svc_dg_str, svc_dg_err3); 153192913Szml goto freedata_nowarn; 154192913Szml } 15574462Salfred xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage)); 15674462Salfred xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage); 15774462Salfred xprt->xp_ltaddr.len = slen; 15874462Salfred memcpy(xprt->xp_ltaddr.buf, &ss, slen); 15974462Salfred 160194448Skan if (ss.ss_family == AF_INET) { 161194448Skan struct sockaddr_in *sin; 162194448Skan static const int true_value = 1; 163194448Skan 164194448Skan sin = (struct sockaddr_in *)(void *)&ss; 165194448Skan if (sin->sin_addr.s_addr == INADDR_ANY) { 166194448Skan su->su_srcaddr.buf = mem_alloc(sizeof (ss)); 167194448Skan su->su_srcaddr.maxlen = sizeof (ss); 168194448Skan 169194448Skan if (_setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, 170194448Skan &true_value, sizeof(true_value))) { 171194448Skan warnx(svc_dg_str, svc_dg_err4); 172194448Skan goto freedata_nowarn; 173194448Skan } 174194448Skan } 175194448Skan } 176194448Skan 17774462Salfred xprt_register(xprt); 17874462Salfred return (xprt); 17974462Salfredfreedata: 18074462Salfred (void) warnx(svc_dg_str, __no_mem_str); 181192913Szmlfreedata_nowarn: 18274462Salfred if (xprt) { 18374462Salfred if (su) 18474462Salfred (void) mem_free(su, sizeof (*su)); 185181344Sdfr svc_xprt_free(xprt); 18674462Salfred } 18774462Salfred return (NULL); 18874462Salfred} 18974462Salfred 19074462Salfred/*ARGSUSED*/ 19174462Salfredstatic enum xprt_stat 19274462Salfredsvc_dg_stat(xprt) 19374462Salfred SVCXPRT *xprt; 19474462Salfred{ 19574462Salfred return (XPRT_IDLE); 19674462Salfred} 19774462Salfred 198192913Szmlstatic int 199192913Szmlsvc_dg_recvfrom(int fd, char *buf, int buflen, 200192913Szml struct sockaddr *raddr, socklen_t *raddrlen, 201192913Szml struct sockaddr *laddr, socklen_t *laddrlen) 202192913Szml{ 203192913Szml struct msghdr msg; 204192913Szml struct iovec msg_iov[1]; 205192913Szml struct sockaddr_in *lin = (struct sockaddr_in *)laddr; 206192913Szml int rlen; 207192913Szml bool_t have_lin = FALSE; 208192913Szml char tmp[CMSG_LEN(sizeof(*lin))]; 209192913Szml struct cmsghdr *cmsg; 210192913Szml 211192913Szml memset((char *)&msg, 0, sizeof(msg)); 212192913Szml msg_iov[0].iov_base = buf; 213192913Szml msg_iov[0].iov_len = buflen; 214192913Szml msg.msg_iov = msg_iov; 215192913Szml msg.msg_iovlen = 1; 216192913Szml msg.msg_namelen = *raddrlen; 217192913Szml msg.msg_name = (char *)raddr; 218194448Skan if (laddr != NULL) { 219194448Skan msg.msg_control = (caddr_t)tmp; 220194448Skan msg.msg_controllen = CMSG_LEN(sizeof(*lin)); 221194448Skan } 222192913Szml rlen = _recvmsg(fd, &msg, 0); 223192913Szml if (rlen >= 0) 224192913Szml *raddrlen = msg.msg_namelen; 225192913Szml 226194448Skan if (rlen == -1 || laddr == NULL || 227192913Szml msg.msg_controllen < sizeof(struct cmsghdr) || 228192913Szml msg.msg_flags & MSG_CTRUNC) 229192913Szml return rlen; 230192913Szml 231192913Szml for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; 232193677Skan cmsg = CMSG_NXTHDR(&msg, cmsg)) { 233192913Szml if (cmsg->cmsg_level == IPPROTO_IP && 234192913Szml cmsg->cmsg_type == IP_RECVDSTADDR) { 235192913Szml have_lin = TRUE; 236192913Szml memcpy(&lin->sin_addr, 237194448Skan (struct in_addr *)CMSG_DATA(cmsg), 238194448Skan sizeof(struct in_addr)); 239192913Szml break; 240192913Szml } 241192913Szml } 242192913Szml 243192913Szml lin->sin_family = AF_INET; 244192913Szml lin->sin_port = 0; 245192913Szml *laddrlen = sizeof(struct sockaddr_in); 246192913Szml 247194448Skan if (!have_lin) 248194448Skan lin->sin_addr.s_addr = INADDR_ANY; 249194448Skan 250192913Szml return rlen; 251192913Szml} 252192913Szml 25374462Salfredstatic bool_t 25474462Salfredsvc_dg_recv(xprt, msg) 25574462Salfred SVCXPRT *xprt; 25674462Salfred struct rpc_msg *msg; 25774462Salfred{ 25874462Salfred struct svc_dg_data *su = su_data(xprt); 25974462Salfred XDR *xdrs = &(su->su_xdrs); 26074462Salfred char *reply; 26174462Salfred struct sockaddr_storage ss; 26274462Salfred socklen_t alen; 26374462Salfred size_t replylen; 264109957Smbr ssize_t rlen; 26574462Salfred 26674462Salfredagain: 26774462Salfred alen = sizeof (struct sockaddr_storage); 268192913Szml rlen = svc_dg_recvfrom(xprt->xp_fd, rpc_buffer(xprt), su->su_iosz, 269192913Szml (struct sockaddr *)(void *)&ss, &alen, 270194448Skan (struct sockaddr *)su->su_srcaddr.buf, &su->su_srcaddr.len); 27174462Salfred if (rlen == -1 && errno == EINTR) 27274462Salfred goto again; 273109957Smbr if (rlen == -1 || (rlen < (ssize_t)(4 * sizeof (u_int32_t)))) 27474462Salfred return (FALSE); 27574462Salfred if (xprt->xp_rtaddr.len < alen) { 27674462Salfred if (xprt->xp_rtaddr.len != 0) 27774462Salfred mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.len); 27874462Salfred xprt->xp_rtaddr.buf = mem_alloc(alen); 27974462Salfred xprt->xp_rtaddr.len = alen; 28074462Salfred } 28174462Salfred memcpy(xprt->xp_rtaddr.buf, &ss, alen); 28274462Salfred#ifdef PORTMAP 28374462Salfred if (ss.ss_family == AF_INET) { 28474462Salfred xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf; 28574462Salfred xprt->xp_addrlen = sizeof (struct sockaddr_in); 28674462Salfred } 28774462Salfred#endif /* PORTMAP */ 28874462Salfred xdrs->x_op = XDR_DECODE; 28974462Salfred XDR_SETPOS(xdrs, 0); 29074462Salfred if (! xdr_callmsg(xdrs, msg)) { 29174462Salfred return (FALSE); 29274462Salfred } 29374462Salfred su->su_xid = msg->rm_xid; 29474462Salfred if (su->su_cache != NULL) { 29574462Salfred if (cache_get(xprt, msg, &reply, &replylen)) { 29674462Salfred (void)_sendto(xprt->xp_fd, reply, replylen, 0, 29774462Salfred (struct sockaddr *)(void *)&ss, alen); 29874462Salfred return (FALSE); 29974462Salfred } 30074462Salfred } 30174462Salfred return (TRUE); 30274462Salfred} 30374462Salfred 304192913Szmlstatic int 305192913Szmlsvc_dg_sendto(int fd, char *buf, int buflen, 306192913Szml const struct sockaddr *raddr, socklen_t raddrlen, 307192913Szml const struct sockaddr *laddr, socklen_t laddrlen) 308192913Szml{ 309192913Szml struct msghdr msg; 310192913Szml struct iovec msg_iov[1]; 311192913Szml struct sockaddr_in *laddr_in = (struct sockaddr_in *)laddr; 312192913Szml struct in_addr *lin = &laddr_in->sin_addr; 313192913Szml char tmp[CMSG_SPACE(sizeof(*lin))]; 314192913Szml struct cmsghdr *cmsg; 315192913Szml 316192913Szml memset((char *)&msg, 0, sizeof(msg)); 317192913Szml msg_iov[0].iov_base = buf; 318192913Szml msg_iov[0].iov_len = buflen; 319192913Szml msg.msg_iov = msg_iov; 320192913Szml msg.msg_iovlen = 1; 321192913Szml msg.msg_namelen = raddrlen; 322192913Szml msg.msg_name = (char *)raddr; 323192913Szml 324194448Skan if (laddr != NULL && laddr->sa_family == AF_INET && 325194448Skan lin->s_addr != INADDR_ANY) { 326192913Szml msg.msg_control = (caddr_t)tmp; 327192913Szml msg.msg_controllen = CMSG_LEN(sizeof(*lin)); 328192913Szml cmsg = CMSG_FIRSTHDR(&msg); 329192913Szml cmsg->cmsg_len = CMSG_LEN(sizeof(*lin)); 330192913Szml cmsg->cmsg_level = IPPROTO_IP; 331192913Szml cmsg->cmsg_type = IP_SENDSRCADDR; 332192913Szml memcpy(CMSG_DATA(cmsg), lin, sizeof(*lin)); 333192913Szml } 334192913Szml 335192913Szml return _sendmsg(fd, &msg, 0); 336192913Szml} 337192913Szml 33874462Salfredstatic bool_t 33974462Salfredsvc_dg_reply(xprt, msg) 34074462Salfred SVCXPRT *xprt; 34174462Salfred struct rpc_msg *msg; 34274462Salfred{ 34374462Salfred struct svc_dg_data *su = su_data(xprt); 34474462Salfred XDR *xdrs = &(su->su_xdrs); 345181344Sdfr bool_t stat = TRUE; 34674462Salfred size_t slen; 347181344Sdfr xdrproc_t xdr_proc; 348181344Sdfr caddr_t xdr_where; 34974462Salfred 35074462Salfred xdrs->x_op = XDR_ENCODE; 35174462Salfred XDR_SETPOS(xdrs, 0); 35274462Salfred msg->rm_xid = su->su_xid; 353181344Sdfr if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 354181344Sdfr msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 355181344Sdfr xdr_proc = msg->acpted_rply.ar_results.proc; 356181344Sdfr xdr_where = msg->acpted_rply.ar_results.where; 357181344Sdfr msg->acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; 358181344Sdfr msg->acpted_rply.ar_results.where = NULL; 359181344Sdfr 360181344Sdfr if (!xdr_replymsg(xdrs, msg) || 361181344Sdfr !SVCAUTH_WRAP(&SVC_AUTH(xprt), xdrs, xdr_proc, xdr_where)) 362181344Sdfr stat = FALSE; 363181344Sdfr } else { 364181344Sdfr stat = xdr_replymsg(xdrs, msg); 365181344Sdfr } 366181344Sdfr if (stat) { 36774462Salfred slen = XDR_GETPOS(xdrs); 368192913Szml if (svc_dg_sendto(xprt->xp_fd, rpc_buffer(xprt), slen, 36974462Salfred (struct sockaddr *)xprt->xp_rtaddr.buf, 370192913Szml (socklen_t)xprt->xp_rtaddr.len, 371194448Skan (struct sockaddr *)su->su_srcaddr.buf, 372194448Skan (socklen_t)su->su_srcaddr.len) == (ssize_t) slen) { 37374462Salfred stat = TRUE; 37474462Salfred if (su->su_cache) 37574462Salfred cache_set(xprt, slen); 37674462Salfred } 37774462Salfred } 37874462Salfred return (stat); 37974462Salfred} 38074462Salfred 38174462Salfredstatic bool_t 38274462Salfredsvc_dg_getargs(xprt, xdr_args, args_ptr) 38374462Salfred SVCXPRT *xprt; 38474462Salfred xdrproc_t xdr_args; 38595658Sdes void *args_ptr; 38674462Salfred{ 387181344Sdfr struct svc_dg_data *su; 388181344Sdfr 389181344Sdfr assert(xprt != NULL); 390181344Sdfr su = su_data(xprt); 391181344Sdfr return (SVCAUTH_UNWRAP(&SVC_AUTH(xprt), 392181344Sdfr &su->su_xdrs, xdr_args, args_ptr)); 39374462Salfred} 39474462Salfred 39574462Salfredstatic bool_t 39674462Salfredsvc_dg_freeargs(xprt, xdr_args, args_ptr) 39774462Salfred SVCXPRT *xprt; 39874462Salfred xdrproc_t xdr_args; 39995658Sdes void *args_ptr; 40074462Salfred{ 40174462Salfred XDR *xdrs = &(su_data(xprt)->su_xdrs); 40274462Salfred 40374462Salfred xdrs->x_op = XDR_FREE; 40474462Salfred return (*xdr_args)(xdrs, args_ptr); 40574462Salfred} 40674462Salfred 40774462Salfredstatic void 40874462Salfredsvc_dg_destroy(xprt) 40974462Salfred SVCXPRT *xprt; 41074462Salfred{ 41174462Salfred struct svc_dg_data *su = su_data(xprt); 41274462Salfred 41374462Salfred xprt_unregister(xprt); 41474462Salfred if (xprt->xp_fd != -1) 41574462Salfred (void)_close(xprt->xp_fd); 41674462Salfred XDR_DESTROY(&(su->su_xdrs)); 41774462Salfred (void) mem_free(rpc_buffer(xprt), su->su_iosz); 418194448Skan if (su->su_srcaddr.buf) 419194448Skan (void) mem_free(su->su_srcaddr.buf, su->su_srcaddr.maxlen); 42074462Salfred (void) mem_free(su, sizeof (*su)); 42174462Salfred if (xprt->xp_rtaddr.buf) 42274462Salfred (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen); 42374462Salfred if (xprt->xp_ltaddr.buf) 42474462Salfred (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen); 42574462Salfred if (xprt->xp_tp) 42674462Salfred (void) free(xprt->xp_tp); 427181344Sdfr svc_xprt_free(xprt); 42874462Salfred} 42974462Salfred 43074462Salfredstatic bool_t 43174462Salfred/*ARGSUSED*/ 43274462Salfredsvc_dg_control(xprt, rq, in) 43374462Salfred SVCXPRT *xprt; 43474462Salfred const u_int rq; 43574462Salfred void *in; 43674462Salfred{ 43774462Salfred return (FALSE); 43874462Salfred} 43974462Salfred 44074462Salfredstatic void 44174462Salfredsvc_dg_ops(xprt) 44274462Salfred SVCXPRT *xprt; 44374462Salfred{ 44474462Salfred static struct xp_ops ops; 44574462Salfred static struct xp_ops2 ops2; 44674462Salfred 44774462Salfred/* VARIABLES PROTECTED BY ops_lock: ops */ 44874462Salfred 44974462Salfred mutex_lock(&ops_lock); 45074462Salfred if (ops.xp_recv == NULL) { 45174462Salfred ops.xp_recv = svc_dg_recv; 45274462Salfred ops.xp_stat = svc_dg_stat; 45374462Salfred ops.xp_getargs = svc_dg_getargs; 45474462Salfred ops.xp_reply = svc_dg_reply; 45574462Salfred ops.xp_freeargs = svc_dg_freeargs; 45674462Salfred ops.xp_destroy = svc_dg_destroy; 45774462Salfred ops2.xp_control = svc_dg_control; 45874462Salfred } 45974462Salfred xprt->xp_ops = &ops; 46074462Salfred xprt->xp_ops2 = &ops2; 46174462Salfred mutex_unlock(&ops_lock); 46274462Salfred} 46374462Salfred 46474462Salfred/* The CACHING COMPONENT */ 46574462Salfred 46674462Salfred/* 46774462Salfred * Could have been a separate file, but some part of it depends upon the 46874462Salfred * private structure of the client handle. 46974462Salfred * 47074462Salfred * Fifo cache for cl server 47174462Salfred * Copies pointers to reply buffers into fifo cache 47274462Salfred * Buffers are sent again if retransmissions are detected. 47374462Salfred */ 47474462Salfred 47574462Salfred#define SPARSENESS 4 /* 75% sparse */ 47674462Salfred 47774462Salfred#define ALLOC(type, size) \ 47874462Salfred (type *) mem_alloc((sizeof (type) * (size))) 47974462Salfred 48074462Salfred#define MEMZERO(addr, type, size) \ 48174462Salfred (void) memset((void *) (addr), 0, sizeof (type) * (int) (size)) 48274462Salfred 48374462Salfred#define FREE(addr, type, size) \ 48474462Salfred mem_free((addr), (sizeof (type) * (size))) 48574462Salfred 48674462Salfred/* 48774462Salfred * An entry in the cache 48874462Salfred */ 48974462Salfredtypedef struct cache_node *cache_ptr; 49074462Salfredstruct cache_node { 49174462Salfred /* 49274462Salfred * Index into cache is xid, proc, vers, prog and address 49374462Salfred */ 49474462Salfred u_int32_t cache_xid; 49574462Salfred rpcproc_t cache_proc; 49674462Salfred rpcvers_t cache_vers; 49774462Salfred rpcprog_t cache_prog; 49874462Salfred struct netbuf cache_addr; 49974462Salfred /* 50074462Salfred * The cached reply and length 50174462Salfred */ 50274462Salfred char *cache_reply; 50374462Salfred size_t cache_replylen; 50474462Salfred /* 50574462Salfred * Next node on the list, if there is a collision 50674462Salfred */ 50774462Salfred cache_ptr cache_next; 50874462Salfred}; 50974462Salfred 51074462Salfred/* 51174462Salfred * The entire cache 51274462Salfred */ 51374462Salfredstruct cl_cache { 51474462Salfred u_int uc_size; /* size of cache */ 51574462Salfred cache_ptr *uc_entries; /* hash table of entries in cache */ 51674462Salfred cache_ptr *uc_fifo; /* fifo list of entries in cache */ 51774462Salfred u_int uc_nextvictim; /* points to next victim in fifo list */ 51874462Salfred rpcprog_t uc_prog; /* saved program number */ 51974462Salfred rpcvers_t uc_vers; /* saved version number */ 52074462Salfred rpcproc_t uc_proc; /* saved procedure number */ 52174462Salfred}; 52274462Salfred 52374462Salfred 52474462Salfred/* 52574462Salfred * the hashing function 52674462Salfred */ 52774462Salfred#define CACHE_LOC(transp, xid) \ 52874462Salfred (xid % (SPARSENESS * ((struct cl_cache *) \ 52974462Salfred su_data(transp)->su_cache)->uc_size)) 53074462Salfred 53174462Salfred/* 53274462Salfred * Enable use of the cache. Returns 1 on success, 0 on failure. 53374462Salfred * Note: there is no disable. 53474462Salfred */ 53574462Salfredstatic const char cache_enable_str[] = "svc_enablecache: %s %s"; 53674462Salfredstatic const char alloc_err[] = "could not allocate cache "; 53774462Salfredstatic const char enable_err[] = "cache already enabled"; 53874462Salfred 53974462Salfredint 54074462Salfredsvc_dg_enablecache(transp, size) 54174462Salfred SVCXPRT *transp; 54274462Salfred u_int size; 54374462Salfred{ 54474462Salfred struct svc_dg_data *su = su_data(transp); 54574462Salfred struct cl_cache *uc; 54674462Salfred 54774462Salfred mutex_lock(&dupreq_lock); 54874462Salfred if (su->su_cache != NULL) { 54974462Salfred (void) warnx(cache_enable_str, enable_err, " "); 55074462Salfred mutex_unlock(&dupreq_lock); 55174462Salfred return (0); 55274462Salfred } 55374462Salfred uc = ALLOC(struct cl_cache, 1); 55474462Salfred if (uc == NULL) { 55574462Salfred warnx(cache_enable_str, alloc_err, " "); 55674462Salfred mutex_unlock(&dupreq_lock); 55774462Salfred return (0); 55874462Salfred } 55974462Salfred uc->uc_size = size; 56074462Salfred uc->uc_nextvictim = 0; 56174462Salfred uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS); 56274462Salfred if (uc->uc_entries == NULL) { 56374462Salfred warnx(cache_enable_str, alloc_err, "data"); 56474462Salfred FREE(uc, struct cl_cache, 1); 56574462Salfred mutex_unlock(&dupreq_lock); 56674462Salfred return (0); 56774462Salfred } 56874462Salfred MEMZERO(uc->uc_entries, cache_ptr, size * SPARSENESS); 56974462Salfred uc->uc_fifo = ALLOC(cache_ptr, size); 57074462Salfred if (uc->uc_fifo == NULL) { 57174462Salfred warnx(cache_enable_str, alloc_err, "fifo"); 57274462Salfred FREE(uc->uc_entries, cache_ptr, size * SPARSENESS); 57374462Salfred FREE(uc, struct cl_cache, 1); 57474462Salfred mutex_unlock(&dupreq_lock); 57574462Salfred return (0); 57674462Salfred } 57774462Salfred MEMZERO(uc->uc_fifo, cache_ptr, size); 57874462Salfred su->su_cache = (char *)(void *)uc; 57974462Salfred mutex_unlock(&dupreq_lock); 58074462Salfred return (1); 58174462Salfred} 58274462Salfred 58374462Salfred/* 58474462Salfred * Set an entry in the cache. It assumes that the uc entry is set from 58574462Salfred * the earlier call to cache_get() for the same procedure. This will always 58674462Salfred * happen because cache_get() is calle by svc_dg_recv and cache_set() is called 58774462Salfred * by svc_dg_reply(). All this hoopla because the right RPC parameters are 58874462Salfred * not available at svc_dg_reply time. 58974462Salfred */ 59074462Salfred 59174462Salfredstatic const char cache_set_str[] = "cache_set: %s"; 59274462Salfredstatic const char cache_set_err1[] = "victim not found"; 59374462Salfredstatic const char cache_set_err2[] = "victim alloc failed"; 59474462Salfredstatic const char cache_set_err3[] = "could not allocate new rpc buffer"; 59574462Salfred 59674462Salfredstatic void 59774462Salfredcache_set(xprt, replylen) 59874462Salfred SVCXPRT *xprt; 59974462Salfred size_t replylen; 60074462Salfred{ 60174462Salfred cache_ptr victim; 60274462Salfred cache_ptr *vicp; 60374462Salfred struct svc_dg_data *su = su_data(xprt); 60474462Salfred struct cl_cache *uc = (struct cl_cache *) su->su_cache; 60574462Salfred u_int loc; 60674462Salfred char *newbuf; 60774462Salfred#ifdef RPC_CACHE_DEBUG 60874462Salfred struct netconfig *nconf; 60974462Salfred char *uaddr; 61074462Salfred#endif 61174462Salfred 61274462Salfred mutex_lock(&dupreq_lock); 61374462Salfred /* 61474462Salfred * Find space for the new entry, either by 61574462Salfred * reusing an old entry, or by mallocing a new one 61674462Salfred */ 61774462Salfred victim = uc->uc_fifo[uc->uc_nextvictim]; 61874462Salfred if (victim != NULL) { 61974462Salfred loc = CACHE_LOC(xprt, victim->cache_xid); 62074462Salfred for (vicp = &uc->uc_entries[loc]; 62174462Salfred *vicp != NULL && *vicp != victim; 62274462Salfred vicp = &(*vicp)->cache_next) 62374462Salfred ; 62474462Salfred if (*vicp == NULL) { 62574462Salfred warnx(cache_set_str, cache_set_err1); 62674462Salfred mutex_unlock(&dupreq_lock); 62774462Salfred return; 62874462Salfred } 62974462Salfred *vicp = victim->cache_next; /* remove from cache */ 63074462Salfred newbuf = victim->cache_reply; 63174462Salfred } else { 63274462Salfred victim = ALLOC(struct cache_node, 1); 63374462Salfred if (victim == NULL) { 63474462Salfred warnx(cache_set_str, cache_set_err2); 63574462Salfred mutex_unlock(&dupreq_lock); 63674462Salfred return; 63774462Salfred } 63874462Salfred newbuf = mem_alloc(su->su_iosz); 63974462Salfred if (newbuf == NULL) { 64074462Salfred warnx(cache_set_str, cache_set_err3); 64174462Salfred FREE(victim, struct cache_node, 1); 64274462Salfred mutex_unlock(&dupreq_lock); 64374462Salfred return; 64474462Salfred } 64574462Salfred } 64674462Salfred 64774462Salfred /* 64874462Salfred * Store it away 64974462Salfred */ 65074462Salfred#ifdef RPC_CACHE_DEBUG 65174462Salfred if (nconf = getnetconfigent(xprt->xp_netid)) { 65274462Salfred uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr); 65374462Salfred freenetconfigent(nconf); 65474462Salfred printf( 65574462Salfred "cache set for xid= %x prog=%d vers=%d proc=%d for rmtaddr=%s\n", 65674462Salfred su->su_xid, uc->uc_prog, uc->uc_vers, 65774462Salfred uc->uc_proc, uaddr); 65874462Salfred free(uaddr); 65974462Salfred } 66074462Salfred#endif 66174462Salfred victim->cache_replylen = replylen; 66274462Salfred victim->cache_reply = rpc_buffer(xprt); 66374462Salfred rpc_buffer(xprt) = newbuf; 66474462Salfred xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), 66574462Salfred su->su_iosz, XDR_ENCODE); 66674462Salfred victim->cache_xid = su->su_xid; 66774462Salfred victim->cache_proc = uc->uc_proc; 66874462Salfred victim->cache_vers = uc->uc_vers; 66974462Salfred victim->cache_prog = uc->uc_prog; 67074462Salfred victim->cache_addr = xprt->xp_rtaddr; 67174462Salfred victim->cache_addr.buf = ALLOC(char, xprt->xp_rtaddr.len); 67274462Salfred (void) memcpy(victim->cache_addr.buf, xprt->xp_rtaddr.buf, 67374462Salfred (size_t)xprt->xp_rtaddr.len); 67474462Salfred loc = CACHE_LOC(xprt, victim->cache_xid); 67574462Salfred victim->cache_next = uc->uc_entries[loc]; 67674462Salfred uc->uc_entries[loc] = victim; 67774462Salfred uc->uc_fifo[uc->uc_nextvictim++] = victim; 67874462Salfred uc->uc_nextvictim %= uc->uc_size; 67974462Salfred mutex_unlock(&dupreq_lock); 68074462Salfred} 68174462Salfred 68274462Salfred/* 68374462Salfred * Try to get an entry from the cache 68474462Salfred * return 1 if found, 0 if not found and set the stage for cache_set() 68574462Salfred */ 68674462Salfredstatic int 68774462Salfredcache_get(xprt, msg, replyp, replylenp) 68874462Salfred SVCXPRT *xprt; 68974462Salfred struct rpc_msg *msg; 69074462Salfred char **replyp; 69174462Salfred size_t *replylenp; 69274462Salfred{ 69374462Salfred u_int loc; 69474462Salfred cache_ptr ent; 69574462Salfred struct svc_dg_data *su = su_data(xprt); 69674462Salfred struct cl_cache *uc = (struct cl_cache *) su->su_cache; 69774462Salfred#ifdef RPC_CACHE_DEBUG 69874462Salfred struct netconfig *nconf; 69974462Salfred char *uaddr; 70074462Salfred#endif 70174462Salfred 70274462Salfred mutex_lock(&dupreq_lock); 70374462Salfred loc = CACHE_LOC(xprt, su->su_xid); 70474462Salfred for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) { 70574462Salfred if (ent->cache_xid == su->su_xid && 70674462Salfred ent->cache_proc == msg->rm_call.cb_proc && 70774462Salfred ent->cache_vers == msg->rm_call.cb_vers && 70874462Salfred ent->cache_prog == msg->rm_call.cb_prog && 70974462Salfred ent->cache_addr.len == xprt->xp_rtaddr.len && 71074462Salfred (memcmp(ent->cache_addr.buf, xprt->xp_rtaddr.buf, 71174462Salfred xprt->xp_rtaddr.len) == 0)) { 71274462Salfred#ifdef RPC_CACHE_DEBUG 71374462Salfred if (nconf = getnetconfigent(xprt->xp_netid)) { 71474462Salfred uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr); 71574462Salfred freenetconfigent(nconf); 71674462Salfred printf( 71774462Salfred "cache entry found for xid=%x prog=%d vers=%d proc=%d for rmtaddr=%s\n", 71874462Salfred su->su_xid, msg->rm_call.cb_prog, 71974462Salfred msg->rm_call.cb_vers, 72074462Salfred msg->rm_call.cb_proc, uaddr); 72174462Salfred free(uaddr); 72274462Salfred } 72374462Salfred#endif 72474462Salfred *replyp = ent->cache_reply; 72574462Salfred *replylenp = ent->cache_replylen; 72674462Salfred mutex_unlock(&dupreq_lock); 72774462Salfred return (1); 72874462Salfred } 72974462Salfred } 73074462Salfred /* 73174462Salfred * Failed to find entry 73274462Salfred * Remember a few things so we can do a set later 73374462Salfred */ 73474462Salfred uc->uc_proc = msg->rm_call.cb_proc; 73574462Salfred uc->uc_vers = msg->rm_call.cb_vers; 73674462Salfred uc->uc_prog = msg->rm_call.cb_prog; 73774462Salfred mutex_unlock(&dupreq_lock); 73874462Salfred return (0); 73974462Salfred} 740