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fbbb13f962
Commit the kernel changes.
1327 lines
30 KiB
C
1327 lines
30 KiB
C
/* $NetBSD: svc.c,v 1.21 2000/07/06 03:10:35 christos Exp $ */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *sccsid2 = "@(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)svc.c 2.4 88/08/11 4.0 RPCSRC";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* svc.c, Server-side remote procedure call interface.
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*
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* There are two sets of procedures here. The xprt routines are
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* for handling transport handles. The svc routines handle the
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* list of service routines.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/socketvar.h>
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#include <sys/systm.h>
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#include <sys/ucred.h>
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#include <rpc/rpc.h>
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#include <rpc/rpcb_clnt.h>
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#include <rpc/replay.h>
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#include <rpc/rpc_com.h>
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#define SVC_VERSQUIET 0x0001 /* keep quiet about vers mismatch */
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#define version_keepquiet(xp) (SVC_EXT(xp)->xp_flags & SVC_VERSQUIET)
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static struct svc_callout *svc_find(SVCPOOL *pool, rpcprog_t, rpcvers_t,
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char *);
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static void svc_new_thread(SVCPOOL *pool);
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static void xprt_unregister_locked(SVCXPRT *xprt);
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/* *************** SVCXPRT related stuff **************** */
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static int svcpool_minthread_sysctl(SYSCTL_HANDLER_ARGS);
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static int svcpool_maxthread_sysctl(SYSCTL_HANDLER_ARGS);
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SVCPOOL*
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svcpool_create(const char *name, struct sysctl_oid_list *sysctl_base)
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{
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SVCPOOL *pool;
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pool = malloc(sizeof(SVCPOOL), M_RPC, M_WAITOK|M_ZERO);
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mtx_init(&pool->sp_lock, "sp_lock", NULL, MTX_DEF);
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pool->sp_name = name;
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pool->sp_state = SVCPOOL_INIT;
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pool->sp_proc = NULL;
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TAILQ_INIT(&pool->sp_xlist);
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TAILQ_INIT(&pool->sp_active);
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TAILQ_INIT(&pool->sp_callouts);
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LIST_INIT(&pool->sp_threads);
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LIST_INIT(&pool->sp_idlethreads);
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pool->sp_minthreads = 1;
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pool->sp_maxthreads = 1;
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pool->sp_threadcount = 0;
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/*
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* Don't use more than a quarter of mbuf clusters or more than
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* 45Mb buffering requests.
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*/
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pool->sp_space_high = nmbclusters * MCLBYTES / 4;
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if (pool->sp_space_high > 45 << 20)
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pool->sp_space_high = 45 << 20;
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pool->sp_space_low = 2 * pool->sp_space_high / 3;
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sysctl_ctx_init(&pool->sp_sysctl);
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if (sysctl_base) {
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SYSCTL_ADD_PROC(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"minthreads", CTLTYPE_INT | CTLFLAG_RW,
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pool, 0, svcpool_minthread_sysctl, "I", "");
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SYSCTL_ADD_PROC(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"maxthreads", CTLTYPE_INT | CTLFLAG_RW,
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pool, 0, svcpool_maxthread_sysctl, "I", "");
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SYSCTL_ADD_INT(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"threads", CTLFLAG_RD, &pool->sp_threadcount, 0, "");
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SYSCTL_ADD_UINT(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"request_space_used", CTLFLAG_RD,
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&pool->sp_space_used, 0,
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"Space in parsed but not handled requests.");
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SYSCTL_ADD_UINT(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"request_space_used_highest", CTLFLAG_RD,
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&pool->sp_space_used_highest, 0,
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"Highest space used since reboot.");
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SYSCTL_ADD_UINT(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"request_space_high", CTLFLAG_RW,
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&pool->sp_space_high, 0,
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"Maximum space in parsed but not handled requests.");
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SYSCTL_ADD_UINT(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"request_space_low", CTLFLAG_RW,
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&pool->sp_space_low, 0,
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"Low water mark for request space.");
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SYSCTL_ADD_INT(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"request_space_throttled", CTLFLAG_RD,
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&pool->sp_space_throttled, 0,
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"Whether nfs requests are currently throttled");
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SYSCTL_ADD_INT(&pool->sp_sysctl, sysctl_base, OID_AUTO,
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"request_space_throttle_count", CTLFLAG_RD,
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&pool->sp_space_throttle_count, 0,
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"Count of times throttling based on request space has occurred");
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}
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return pool;
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}
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void
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svcpool_destroy(SVCPOOL *pool)
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{
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SVCXPRT *xprt, *nxprt;
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struct svc_callout *s;
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struct svcxprt_list cleanup;
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TAILQ_INIT(&cleanup);
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mtx_lock(&pool->sp_lock);
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while (TAILQ_FIRST(&pool->sp_xlist)) {
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xprt = TAILQ_FIRST(&pool->sp_xlist);
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xprt_unregister_locked(xprt);
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TAILQ_INSERT_TAIL(&cleanup, xprt, xp_link);
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}
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while (TAILQ_FIRST(&pool->sp_callouts)) {
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s = TAILQ_FIRST(&pool->sp_callouts);
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mtx_unlock(&pool->sp_lock);
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svc_unreg(pool, s->sc_prog, s->sc_vers);
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mtx_lock(&pool->sp_lock);
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}
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mtx_unlock(&pool->sp_lock);
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TAILQ_FOREACH_SAFE(xprt, &cleanup, xp_link, nxprt) {
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SVC_RELEASE(xprt);
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}
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mtx_destroy(&pool->sp_lock);
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if (pool->sp_rcache)
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replay_freecache(pool->sp_rcache);
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sysctl_ctx_free(&pool->sp_sysctl);
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free(pool, M_RPC);
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}
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static bool_t
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svcpool_active(SVCPOOL *pool)
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{
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enum svcpool_state state = pool->sp_state;
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if (state == SVCPOOL_INIT || state == SVCPOOL_CLOSING)
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return (FALSE);
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return (TRUE);
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}
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/*
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* Sysctl handler to set the minimum thread count on a pool
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*/
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static int
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svcpool_minthread_sysctl(SYSCTL_HANDLER_ARGS)
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{
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SVCPOOL *pool;
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int newminthreads, error, n;
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pool = oidp->oid_arg1;
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newminthreads = pool->sp_minthreads;
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error = sysctl_handle_int(oidp, &newminthreads, 0, req);
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if (error == 0 && newminthreads != pool->sp_minthreads) {
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if (newminthreads > pool->sp_maxthreads)
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return (EINVAL);
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mtx_lock(&pool->sp_lock);
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if (newminthreads > pool->sp_minthreads
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&& svcpool_active(pool)) {
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/*
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* If the pool is running and we are
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* increasing, create some more threads now.
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*/
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n = newminthreads - pool->sp_threadcount;
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if (n > 0) {
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mtx_unlock(&pool->sp_lock);
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while (n--)
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svc_new_thread(pool);
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mtx_lock(&pool->sp_lock);
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}
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}
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pool->sp_minthreads = newminthreads;
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mtx_unlock(&pool->sp_lock);
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}
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return (error);
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}
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/*
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* Sysctl handler to set the maximum thread count on a pool
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*/
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static int
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svcpool_maxthread_sysctl(SYSCTL_HANDLER_ARGS)
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{
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SVCPOOL *pool;
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SVCTHREAD *st;
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int newmaxthreads, error;
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pool = oidp->oid_arg1;
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newmaxthreads = pool->sp_maxthreads;
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error = sysctl_handle_int(oidp, &newmaxthreads, 0, req);
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if (error == 0 && newmaxthreads != pool->sp_maxthreads) {
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if (newmaxthreads < pool->sp_minthreads)
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return (EINVAL);
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mtx_lock(&pool->sp_lock);
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if (newmaxthreads < pool->sp_maxthreads
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&& svcpool_active(pool)) {
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/*
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* If the pool is running and we are
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* decreasing, wake up some idle threads to
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* encourage them to exit.
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*/
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LIST_FOREACH(st, &pool->sp_idlethreads, st_ilink)
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cv_signal(&st->st_cond);
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}
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pool->sp_maxthreads = newmaxthreads;
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mtx_unlock(&pool->sp_lock);
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}
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return (error);
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}
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/*
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* Activate a transport handle.
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*/
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void
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xprt_register(SVCXPRT *xprt)
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{
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SVCPOOL *pool = xprt->xp_pool;
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SVC_ACQUIRE(xprt);
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mtx_lock(&pool->sp_lock);
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xprt->xp_registered = TRUE;
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xprt->xp_active = FALSE;
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TAILQ_INSERT_TAIL(&pool->sp_xlist, xprt, xp_link);
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mtx_unlock(&pool->sp_lock);
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}
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/*
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* De-activate a transport handle. Note: the locked version doesn't
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* release the transport - caller must do that after dropping the pool
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* lock.
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*/
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static void
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xprt_unregister_locked(SVCXPRT *xprt)
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{
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SVCPOOL *pool = xprt->xp_pool;
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KASSERT(xprt->xp_registered == TRUE,
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("xprt_unregister_locked: not registered"));
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if (xprt->xp_active) {
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TAILQ_REMOVE(&pool->sp_active, xprt, xp_alink);
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xprt->xp_active = FALSE;
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}
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TAILQ_REMOVE(&pool->sp_xlist, xprt, xp_link);
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xprt->xp_registered = FALSE;
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}
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void
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xprt_unregister(SVCXPRT *xprt)
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{
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SVCPOOL *pool = xprt->xp_pool;
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mtx_lock(&pool->sp_lock);
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if (xprt->xp_registered == FALSE) {
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/* Already unregistered by another thread */
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mtx_unlock(&pool->sp_lock);
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return;
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}
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xprt_unregister_locked(xprt);
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mtx_unlock(&pool->sp_lock);
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SVC_RELEASE(xprt);
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}
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static void
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xprt_assignthread(SVCXPRT *xprt)
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{
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SVCPOOL *pool = xprt->xp_pool;
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SVCTHREAD *st;
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/*
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* Attempt to assign a service thread to this
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* transport.
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*/
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LIST_FOREACH(st, &pool->sp_idlethreads, st_ilink) {
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if (st->st_xprt == NULL && STAILQ_EMPTY(&st->st_reqs))
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break;
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}
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if (st) {
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SVC_ACQUIRE(xprt);
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xprt->xp_thread = st;
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st->st_xprt = xprt;
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cv_signal(&st->st_cond);
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} else {
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/*
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* See if we can create a new thread. The
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* actual thread creation happens in
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* svc_run_internal because our locking state
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* is poorly defined (we are typically called
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* from a socket upcall). Don't create more
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* than one thread per second.
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*/
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if (pool->sp_state == SVCPOOL_ACTIVE
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&& pool->sp_lastcreatetime < time_uptime
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&& pool->sp_threadcount < pool->sp_maxthreads) {
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pool->sp_state = SVCPOOL_THREADWANTED;
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}
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}
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}
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void
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xprt_active(SVCXPRT *xprt)
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{
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SVCPOOL *pool = xprt->xp_pool;
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mtx_lock(&pool->sp_lock);
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if (!xprt->xp_registered) {
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/*
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* Race with xprt_unregister - we lose.
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*/
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mtx_unlock(&pool->sp_lock);
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return;
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}
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if (!xprt->xp_active) {
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TAILQ_INSERT_TAIL(&pool->sp_active, xprt, xp_alink);
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xprt->xp_active = TRUE;
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xprt_assignthread(xprt);
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}
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mtx_unlock(&pool->sp_lock);
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}
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void
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xprt_inactive_locked(SVCXPRT *xprt)
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{
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SVCPOOL *pool = xprt->xp_pool;
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if (xprt->xp_active) {
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TAILQ_REMOVE(&pool->sp_active, xprt, xp_alink);
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xprt->xp_active = FALSE;
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}
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}
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void
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xprt_inactive(SVCXPRT *xprt)
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{
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SVCPOOL *pool = xprt->xp_pool;
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mtx_lock(&pool->sp_lock);
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xprt_inactive_locked(xprt);
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mtx_unlock(&pool->sp_lock);
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}
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/*
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* Add a service program to the callout list.
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* The dispatch routine will be called when a rpc request for this
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* program number comes in.
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*/
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bool_t
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svc_reg(SVCXPRT *xprt, const rpcprog_t prog, const rpcvers_t vers,
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void (*dispatch)(struct svc_req *, SVCXPRT *),
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const struct netconfig *nconf)
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{
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SVCPOOL *pool = xprt->xp_pool;
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struct svc_callout *s;
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char *netid = NULL;
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int flag = 0;
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/* VARIABLES PROTECTED BY svc_lock: s, svc_head */
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if (xprt->xp_netid) {
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netid = strdup(xprt->xp_netid, M_RPC);
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flag = 1;
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} else if (nconf && nconf->nc_netid) {
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netid = strdup(nconf->nc_netid, M_RPC);
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flag = 1;
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} /* must have been created with svc_raw_create */
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if ((netid == NULL) && (flag == 1)) {
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return (FALSE);
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}
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mtx_lock(&pool->sp_lock);
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if ((s = svc_find(pool, prog, vers, netid)) != NULL) {
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if (netid)
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free(netid, M_RPC);
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if (s->sc_dispatch == dispatch)
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goto rpcb_it; /* he is registering another xptr */
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mtx_unlock(&pool->sp_lock);
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return (FALSE);
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}
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s = malloc(sizeof (struct svc_callout), M_RPC, M_NOWAIT);
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if (s == NULL) {
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if (netid)
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free(netid, M_RPC);
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mtx_unlock(&pool->sp_lock);
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return (FALSE);
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}
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s->sc_prog = prog;
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s->sc_vers = vers;
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s->sc_dispatch = dispatch;
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s->sc_netid = netid;
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TAILQ_INSERT_TAIL(&pool->sp_callouts, s, sc_link);
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if ((xprt->xp_netid == NULL) && (flag == 1) && netid)
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((SVCXPRT *) xprt)->xp_netid = strdup(netid, M_RPC);
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rpcb_it:
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mtx_unlock(&pool->sp_lock);
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/* now register the information with the local binder service */
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if (nconf) {
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bool_t dummy;
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struct netconfig tnc;
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struct netbuf nb;
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tnc = *nconf;
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nb.buf = &xprt->xp_ltaddr;
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nb.len = xprt->xp_ltaddr.ss_len;
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dummy = rpcb_set(prog, vers, &tnc, &nb);
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return (dummy);
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}
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return (TRUE);
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}
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/*
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* Remove a service program from the callout list.
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*/
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void
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svc_unreg(SVCPOOL *pool, const rpcprog_t prog, const rpcvers_t vers)
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{
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struct svc_callout *s;
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/* unregister the information anyway */
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(void) rpcb_unset(prog, vers, NULL);
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mtx_lock(&pool->sp_lock);
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while ((s = svc_find(pool, prog, vers, NULL)) != NULL) {
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TAILQ_REMOVE(&pool->sp_callouts, s, sc_link);
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if (s->sc_netid)
|
|
mem_free(s->sc_netid, sizeof (s->sc_netid) + 1);
|
|
mem_free(s, sizeof (struct svc_callout));
|
|
}
|
|
mtx_unlock(&pool->sp_lock);
|
|
}
|
|
|
|
/* ********************** CALLOUT list related stuff ************* */
|
|
|
|
/*
|
|
* Search the callout list for a program number, return the callout
|
|
* struct.
|
|
*/
|
|
static struct svc_callout *
|
|
svc_find(SVCPOOL *pool, rpcprog_t prog, rpcvers_t vers, char *netid)
|
|
{
|
|
struct svc_callout *s;
|
|
|
|
mtx_assert(&pool->sp_lock, MA_OWNED);
|
|
TAILQ_FOREACH(s, &pool->sp_callouts, sc_link) {
|
|
if (s->sc_prog == prog && s->sc_vers == vers
|
|
&& (netid == NULL || s->sc_netid == NULL ||
|
|
strcmp(netid, s->sc_netid) == 0))
|
|
break;
|
|
}
|
|
|
|
return (s);
|
|
}
|
|
|
|
/* ******************* REPLY GENERATION ROUTINES ************ */
|
|
|
|
static bool_t
|
|
svc_sendreply_common(struct svc_req *rqstp, struct rpc_msg *rply,
|
|
struct mbuf *body)
|
|
{
|
|
SVCXPRT *xprt = rqstp->rq_xprt;
|
|
bool_t ok;
|
|
|
|
if (rqstp->rq_args) {
|
|
m_freem(rqstp->rq_args);
|
|
rqstp->rq_args = NULL;
|
|
}
|
|
|
|
if (xprt->xp_pool->sp_rcache)
|
|
replay_setreply(xprt->xp_pool->sp_rcache,
|
|
rply, svc_getrpccaller(rqstp), body);
|
|
|
|
if (!SVCAUTH_WRAP(&rqstp->rq_auth, &body))
|
|
return (FALSE);
|
|
|
|
ok = SVC_REPLY(xprt, rply, rqstp->rq_addr, body);
|
|
if (rqstp->rq_addr) {
|
|
free(rqstp->rq_addr, M_SONAME);
|
|
rqstp->rq_addr = NULL;
|
|
}
|
|
|
|
return (ok);
|
|
}
|
|
|
|
/*
|
|
* Send a reply to an rpc request
|
|
*/
|
|
bool_t
|
|
svc_sendreply(struct svc_req *rqstp, xdrproc_t xdr_results, void * xdr_location)
|
|
{
|
|
struct rpc_msg rply;
|
|
struct mbuf *m;
|
|
XDR xdrs;
|
|
bool_t ok;
|
|
|
|
rply.rm_xid = rqstp->rq_xid;
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_ACCEPTED;
|
|
rply.acpted_rply.ar_verf = rqstp->rq_verf;
|
|
rply.acpted_rply.ar_stat = SUCCESS;
|
|
rply.acpted_rply.ar_results.where = NULL;
|
|
rply.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
|
|
|
|
MGET(m, M_WAIT, MT_DATA);
|
|
MCLGET(m, M_WAIT);
|
|
m->m_len = 0;
|
|
xdrmbuf_create(&xdrs, m, XDR_ENCODE);
|
|
ok = xdr_results(&xdrs, xdr_location);
|
|
XDR_DESTROY(&xdrs);
|
|
|
|
if (ok) {
|
|
return (svc_sendreply_common(rqstp, &rply, m));
|
|
} else {
|
|
m_freem(m);
|
|
return (FALSE);
|
|
}
|
|
}
|
|
|
|
bool_t
|
|
svc_sendreply_mbuf(struct svc_req *rqstp, struct mbuf *m)
|
|
{
|
|
struct rpc_msg rply;
|
|
|
|
rply.rm_xid = rqstp->rq_xid;
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_ACCEPTED;
|
|
rply.acpted_rply.ar_verf = rqstp->rq_verf;
|
|
rply.acpted_rply.ar_stat = SUCCESS;
|
|
rply.acpted_rply.ar_results.where = NULL;
|
|
rply.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
|
|
|
|
return (svc_sendreply_common(rqstp, &rply, m));
|
|
}
|
|
|
|
/*
|
|
* No procedure error reply
|
|
*/
|
|
void
|
|
svcerr_noproc(struct svc_req *rqstp)
|
|
{
|
|
SVCXPRT *xprt = rqstp->rq_xprt;
|
|
struct rpc_msg rply;
|
|
|
|
rply.rm_xid = rqstp->rq_xid;
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_ACCEPTED;
|
|
rply.acpted_rply.ar_verf = rqstp->rq_verf;
|
|
rply.acpted_rply.ar_stat = PROC_UNAVAIL;
|
|
|
|
if (xprt->xp_pool->sp_rcache)
|
|
replay_setreply(xprt->xp_pool->sp_rcache,
|
|
&rply, svc_getrpccaller(rqstp), NULL);
|
|
|
|
svc_sendreply_common(rqstp, &rply, NULL);
|
|
}
|
|
|
|
/*
|
|
* Can't decode args error reply
|
|
*/
|
|
void
|
|
svcerr_decode(struct svc_req *rqstp)
|
|
{
|
|
SVCXPRT *xprt = rqstp->rq_xprt;
|
|
struct rpc_msg rply;
|
|
|
|
rply.rm_xid = rqstp->rq_xid;
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_ACCEPTED;
|
|
rply.acpted_rply.ar_verf = rqstp->rq_verf;
|
|
rply.acpted_rply.ar_stat = GARBAGE_ARGS;
|
|
|
|
if (xprt->xp_pool->sp_rcache)
|
|
replay_setreply(xprt->xp_pool->sp_rcache,
|
|
&rply, (struct sockaddr *) &xprt->xp_rtaddr, NULL);
|
|
|
|
svc_sendreply_common(rqstp, &rply, NULL);
|
|
}
|
|
|
|
/*
|
|
* Some system error
|
|
*/
|
|
void
|
|
svcerr_systemerr(struct svc_req *rqstp)
|
|
{
|
|
SVCXPRT *xprt = rqstp->rq_xprt;
|
|
struct rpc_msg rply;
|
|
|
|
rply.rm_xid = rqstp->rq_xid;
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_ACCEPTED;
|
|
rply.acpted_rply.ar_verf = rqstp->rq_verf;
|
|
rply.acpted_rply.ar_stat = SYSTEM_ERR;
|
|
|
|
if (xprt->xp_pool->sp_rcache)
|
|
replay_setreply(xprt->xp_pool->sp_rcache,
|
|
&rply, svc_getrpccaller(rqstp), NULL);
|
|
|
|
svc_sendreply_common(rqstp, &rply, NULL);
|
|
}
|
|
|
|
/*
|
|
* Authentication error reply
|
|
*/
|
|
void
|
|
svcerr_auth(struct svc_req *rqstp, enum auth_stat why)
|
|
{
|
|
SVCXPRT *xprt = rqstp->rq_xprt;
|
|
struct rpc_msg rply;
|
|
|
|
rply.rm_xid = rqstp->rq_xid;
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_DENIED;
|
|
rply.rjcted_rply.rj_stat = AUTH_ERROR;
|
|
rply.rjcted_rply.rj_why = why;
|
|
|
|
if (xprt->xp_pool->sp_rcache)
|
|
replay_setreply(xprt->xp_pool->sp_rcache,
|
|
&rply, svc_getrpccaller(rqstp), NULL);
|
|
|
|
svc_sendreply_common(rqstp, &rply, NULL);
|
|
}
|
|
|
|
/*
|
|
* Auth too weak error reply
|
|
*/
|
|
void
|
|
svcerr_weakauth(struct svc_req *rqstp)
|
|
{
|
|
|
|
svcerr_auth(rqstp, AUTH_TOOWEAK);
|
|
}
|
|
|
|
/*
|
|
* Program unavailable error reply
|
|
*/
|
|
void
|
|
svcerr_noprog(struct svc_req *rqstp)
|
|
{
|
|
SVCXPRT *xprt = rqstp->rq_xprt;
|
|
struct rpc_msg rply;
|
|
|
|
rply.rm_xid = rqstp->rq_xid;
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_ACCEPTED;
|
|
rply.acpted_rply.ar_verf = rqstp->rq_verf;
|
|
rply.acpted_rply.ar_stat = PROG_UNAVAIL;
|
|
|
|
if (xprt->xp_pool->sp_rcache)
|
|
replay_setreply(xprt->xp_pool->sp_rcache,
|
|
&rply, svc_getrpccaller(rqstp), NULL);
|
|
|
|
svc_sendreply_common(rqstp, &rply, NULL);
|
|
}
|
|
|
|
/*
|
|
* Program version mismatch error reply
|
|
*/
|
|
void
|
|
svcerr_progvers(struct svc_req *rqstp, rpcvers_t low_vers, rpcvers_t high_vers)
|
|
{
|
|
SVCXPRT *xprt = rqstp->rq_xprt;
|
|
struct rpc_msg rply;
|
|
|
|
rply.rm_xid = rqstp->rq_xid;
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_ACCEPTED;
|
|
rply.acpted_rply.ar_verf = rqstp->rq_verf;
|
|
rply.acpted_rply.ar_stat = PROG_MISMATCH;
|
|
rply.acpted_rply.ar_vers.low = (uint32_t)low_vers;
|
|
rply.acpted_rply.ar_vers.high = (uint32_t)high_vers;
|
|
|
|
if (xprt->xp_pool->sp_rcache)
|
|
replay_setreply(xprt->xp_pool->sp_rcache,
|
|
&rply, svc_getrpccaller(rqstp), NULL);
|
|
|
|
svc_sendreply_common(rqstp, &rply, NULL);
|
|
}
|
|
|
|
/*
|
|
* Allocate a new server transport structure. All fields are
|
|
* initialized to zero and xp_p3 is initialized to point at an
|
|
* extension structure to hold various flags and authentication
|
|
* parameters.
|
|
*/
|
|
SVCXPRT *
|
|
svc_xprt_alloc()
|
|
{
|
|
SVCXPRT *xprt;
|
|
SVCXPRT_EXT *ext;
|
|
|
|
xprt = mem_alloc(sizeof(SVCXPRT));
|
|
memset(xprt, 0, sizeof(SVCXPRT));
|
|
ext = mem_alloc(sizeof(SVCXPRT_EXT));
|
|
memset(ext, 0, sizeof(SVCXPRT_EXT));
|
|
xprt->xp_p3 = ext;
|
|
refcount_init(&xprt->xp_refs, 1);
|
|
|
|
return (xprt);
|
|
}
|
|
|
|
/*
|
|
* Free a server transport structure.
|
|
*/
|
|
void
|
|
svc_xprt_free(xprt)
|
|
SVCXPRT *xprt;
|
|
{
|
|
|
|
mem_free(xprt->xp_p3, sizeof(SVCXPRT_EXT));
|
|
mem_free(xprt, sizeof(SVCXPRT));
|
|
}
|
|
|
|
/* ******************* SERVER INPUT STUFF ******************* */
|
|
|
|
/*
|
|
* Read RPC requests from a transport and queue them to be
|
|
* executed. We handle authentication and replay cache replies here.
|
|
* Actually dispatching the RPC is deferred till svc_executereq.
|
|
*/
|
|
static enum xprt_stat
|
|
svc_getreq(SVCXPRT *xprt, struct svc_req **rqstp_ret)
|
|
{
|
|
SVCPOOL *pool = xprt->xp_pool;
|
|
struct svc_req *r;
|
|
struct rpc_msg msg;
|
|
struct mbuf *args;
|
|
enum xprt_stat stat;
|
|
|
|
/* now receive msgs from xprtprt (support batch calls) */
|
|
r = malloc(sizeof(*r), M_RPC, M_WAITOK|M_ZERO);
|
|
|
|
msg.rm_call.cb_cred.oa_base = r->rq_credarea;
|
|
msg.rm_call.cb_verf.oa_base = &r->rq_credarea[MAX_AUTH_BYTES];
|
|
r->rq_clntcred = &r->rq_credarea[2*MAX_AUTH_BYTES];
|
|
if (SVC_RECV(xprt, &msg, &r->rq_addr, &args)) {
|
|
enum auth_stat why;
|
|
|
|
/*
|
|
* Handle replays and authenticate before queuing the
|
|
* request to be executed.
|
|
*/
|
|
SVC_ACQUIRE(xprt);
|
|
r->rq_xprt = xprt;
|
|
if (pool->sp_rcache) {
|
|
struct rpc_msg repmsg;
|
|
struct mbuf *repbody;
|
|
enum replay_state rs;
|
|
rs = replay_find(pool->sp_rcache, &msg,
|
|
svc_getrpccaller(r), &repmsg, &repbody);
|
|
switch (rs) {
|
|
case RS_NEW:
|
|
break;
|
|
case RS_DONE:
|
|
SVC_REPLY(xprt, &repmsg, r->rq_addr,
|
|
repbody);
|
|
if (r->rq_addr) {
|
|
free(r->rq_addr, M_SONAME);
|
|
r->rq_addr = NULL;
|
|
}
|
|
m_freem(args);
|
|
goto call_done;
|
|
|
|
default:
|
|
m_freem(args);
|
|
goto call_done;
|
|
}
|
|
}
|
|
|
|
r->rq_xid = msg.rm_xid;
|
|
r->rq_prog = msg.rm_call.cb_prog;
|
|
r->rq_vers = msg.rm_call.cb_vers;
|
|
r->rq_proc = msg.rm_call.cb_proc;
|
|
r->rq_size = sizeof(*r) + m_length(args, NULL);
|
|
r->rq_args = args;
|
|
if ((why = _authenticate(r, &msg)) != AUTH_OK) {
|
|
/*
|
|
* RPCSEC_GSS uses this return code
|
|
* for requests that form part of its
|
|
* context establishment protocol and
|
|
* should not be dispatched to the
|
|
* application.
|
|
*/
|
|
if (why != RPCSEC_GSS_NODISPATCH)
|
|
svcerr_auth(r, why);
|
|
goto call_done;
|
|
}
|
|
|
|
if (!SVCAUTH_UNWRAP(&r->rq_auth, &r->rq_args)) {
|
|
svcerr_decode(r);
|
|
goto call_done;
|
|
}
|
|
|
|
/*
|
|
* Everything checks out, return request to caller.
|
|
*/
|
|
*rqstp_ret = r;
|
|
r = NULL;
|
|
}
|
|
call_done:
|
|
if (r) {
|
|
svc_freereq(r);
|
|
r = NULL;
|
|
}
|
|
if ((stat = SVC_STAT(xprt)) == XPRT_DIED) {
|
|
xprt_unregister(xprt);
|
|
}
|
|
|
|
return (stat);
|
|
}
|
|
|
|
static void
|
|
svc_executereq(struct svc_req *rqstp)
|
|
{
|
|
SVCXPRT *xprt = rqstp->rq_xprt;
|
|
SVCPOOL *pool = xprt->xp_pool;
|
|
int prog_found;
|
|
rpcvers_t low_vers;
|
|
rpcvers_t high_vers;
|
|
struct svc_callout *s;
|
|
|
|
/* now match message with a registered service*/
|
|
prog_found = FALSE;
|
|
low_vers = (rpcvers_t) -1L;
|
|
high_vers = (rpcvers_t) 0L;
|
|
TAILQ_FOREACH(s, &pool->sp_callouts, sc_link) {
|
|
if (s->sc_prog == rqstp->rq_prog) {
|
|
if (s->sc_vers == rqstp->rq_vers) {
|
|
/*
|
|
* We hand ownership of r to the
|
|
* dispatch method - they must call
|
|
* svc_freereq.
|
|
*/
|
|
(*s->sc_dispatch)(rqstp, xprt);
|
|
return;
|
|
} /* found correct version */
|
|
prog_found = TRUE;
|
|
if (s->sc_vers < low_vers)
|
|
low_vers = s->sc_vers;
|
|
if (s->sc_vers > high_vers)
|
|
high_vers = s->sc_vers;
|
|
} /* found correct program */
|
|
}
|
|
|
|
/*
|
|
* if we got here, the program or version
|
|
* is not served ...
|
|
*/
|
|
if (prog_found)
|
|
svcerr_progvers(rqstp, low_vers, high_vers);
|
|
else
|
|
svcerr_noprog(rqstp);
|
|
|
|
svc_freereq(rqstp);
|
|
}
|
|
|
|
static void
|
|
svc_checkidle(SVCPOOL *pool)
|
|
{
|
|
SVCXPRT *xprt, *nxprt;
|
|
time_t timo;
|
|
struct svcxprt_list cleanup;
|
|
|
|
TAILQ_INIT(&cleanup);
|
|
TAILQ_FOREACH_SAFE(xprt, &pool->sp_xlist, xp_link, nxprt) {
|
|
/*
|
|
* Only some transports have idle timers. Don't time
|
|
* something out which is just waking up.
|
|
*/
|
|
if (!xprt->xp_idletimeout || xprt->xp_thread)
|
|
continue;
|
|
|
|
timo = xprt->xp_lastactive + xprt->xp_idletimeout;
|
|
if (time_uptime > timo) {
|
|
xprt_unregister_locked(xprt);
|
|
TAILQ_INSERT_TAIL(&cleanup, xprt, xp_link);
|
|
}
|
|
}
|
|
|
|
mtx_unlock(&pool->sp_lock);
|
|
TAILQ_FOREACH_SAFE(xprt, &cleanup, xp_link, nxprt) {
|
|
SVC_RELEASE(xprt);
|
|
}
|
|
mtx_lock(&pool->sp_lock);
|
|
|
|
}
|
|
|
|
static void
|
|
svc_assign_waiting_sockets(SVCPOOL *pool)
|
|
{
|
|
SVCXPRT *xprt;
|
|
|
|
TAILQ_FOREACH(xprt, &pool->sp_active, xp_alink) {
|
|
if (!xprt->xp_thread) {
|
|
xprt_assignthread(xprt);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool_t
|
|
svc_request_space_available(SVCPOOL *pool)
|
|
{
|
|
|
|
mtx_assert(&pool->sp_lock, MA_OWNED);
|
|
|
|
if (pool->sp_space_throttled) {
|
|
/*
|
|
* Below the low-water yet? If so, assign any waiting sockets.
|
|
*/
|
|
if (pool->sp_space_used < pool->sp_space_low) {
|
|
pool->sp_space_throttled = FALSE;
|
|
svc_assign_waiting_sockets(pool);
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
} else {
|
|
if (pool->sp_space_used
|
|
>= pool->sp_space_high) {
|
|
pool->sp_space_throttled = TRUE;
|
|
pool->sp_space_throttle_count++;
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
static void
|
|
svc_run_internal(SVCPOOL *pool, bool_t ismaster)
|
|
{
|
|
SVCTHREAD *st, *stpref;
|
|
SVCXPRT *xprt;
|
|
enum xprt_stat stat;
|
|
struct svc_req *rqstp;
|
|
int error;
|
|
|
|
st = mem_alloc(sizeof(*st));
|
|
st->st_xprt = NULL;
|
|
STAILQ_INIT(&st->st_reqs);
|
|
cv_init(&st->st_cond, "rpcsvc");
|
|
|
|
mtx_lock(&pool->sp_lock);
|
|
LIST_INSERT_HEAD(&pool->sp_threads, st, st_link);
|
|
|
|
/*
|
|
* If we are a new thread which was spawned to cope with
|
|
* increased load, set the state back to SVCPOOL_ACTIVE.
|
|
*/
|
|
if (pool->sp_state == SVCPOOL_THREADSTARTING)
|
|
pool->sp_state = SVCPOOL_ACTIVE;
|
|
|
|
while (pool->sp_state != SVCPOOL_CLOSING) {
|
|
/*
|
|
* Check for idle transports once per second.
|
|
*/
|
|
if (time_uptime > pool->sp_lastidlecheck) {
|
|
pool->sp_lastidlecheck = time_uptime;
|
|
svc_checkidle(pool);
|
|
}
|
|
|
|
xprt = st->st_xprt;
|
|
if (!xprt && STAILQ_EMPTY(&st->st_reqs)) {
|
|
/*
|
|
* Enforce maxthreads count.
|
|
*/
|
|
if (pool->sp_threadcount > pool->sp_maxthreads)
|
|
break;
|
|
|
|
/*
|
|
* Before sleeping, see if we can find an
|
|
* active transport which isn't being serviced
|
|
* by a thread.
|
|
*/
|
|
if (svc_request_space_available(pool)) {
|
|
TAILQ_FOREACH(xprt, &pool->sp_active,
|
|
xp_alink) {
|
|
if (!xprt->xp_thread) {
|
|
SVC_ACQUIRE(xprt);
|
|
xprt->xp_thread = st;
|
|
st->st_xprt = xprt;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (st->st_xprt)
|
|
continue;
|
|
|
|
LIST_INSERT_HEAD(&pool->sp_idlethreads, st, st_ilink);
|
|
error = cv_timedwait_sig(&st->st_cond, &pool->sp_lock,
|
|
5 * hz);
|
|
LIST_REMOVE(st, st_ilink);
|
|
|
|
/*
|
|
* Reduce worker thread count when idle.
|
|
*/
|
|
if (error == EWOULDBLOCK) {
|
|
if (!ismaster
|
|
&& (pool->sp_threadcount
|
|
> pool->sp_minthreads)
|
|
&& !st->st_xprt
|
|
&& STAILQ_EMPTY(&st->st_reqs))
|
|
break;
|
|
}
|
|
if (error == EWOULDBLOCK)
|
|
continue;
|
|
if (error) {
|
|
if (pool->sp_state != SVCPOOL_CLOSING) {
|
|
mtx_unlock(&pool->sp_lock);
|
|
svc_exit(pool);
|
|
mtx_lock(&pool->sp_lock);
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (pool->sp_state == SVCPOOL_THREADWANTED) {
|
|
pool->sp_state = SVCPOOL_THREADSTARTING;
|
|
pool->sp_lastcreatetime = time_uptime;
|
|
mtx_unlock(&pool->sp_lock);
|
|
svc_new_thread(pool);
|
|
mtx_lock(&pool->sp_lock);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (xprt) {
|
|
/*
|
|
* Drain the transport socket and queue up any
|
|
* RPCs.
|
|
*/
|
|
xprt->xp_lastactive = time_uptime;
|
|
stat = XPRT_IDLE;
|
|
do {
|
|
if (!svc_request_space_available(pool))
|
|
break;
|
|
rqstp = NULL;
|
|
mtx_unlock(&pool->sp_lock);
|
|
stat = svc_getreq(xprt, &rqstp);
|
|
mtx_lock(&pool->sp_lock);
|
|
if (rqstp) {
|
|
/*
|
|
* See if the application has
|
|
* a preference for some other
|
|
* thread.
|
|
*/
|
|
stpref = st;
|
|
if (pool->sp_assign)
|
|
stpref = pool->sp_assign(st,
|
|
rqstp);
|
|
|
|
pool->sp_space_used +=
|
|
rqstp->rq_size;
|
|
if (pool->sp_space_used
|
|
> pool->sp_space_used_highest)
|
|
pool->sp_space_used_highest =
|
|
pool->sp_space_used;
|
|
rqstp->rq_thread = stpref;
|
|
STAILQ_INSERT_TAIL(&stpref->st_reqs,
|
|
rqstp, rq_link);
|
|
stpref->st_reqcount++;
|
|
|
|
/*
|
|
* If we assigned the request
|
|
* to another thread, make
|
|
* sure its awake and continue
|
|
* reading from the
|
|
* socket. Otherwise, try to
|
|
* find some other thread to
|
|
* read from the socket and
|
|
* execute the request
|
|
* immediately.
|
|
*/
|
|
if (stpref != st) {
|
|
cv_signal(&stpref->st_cond);
|
|
continue;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
} while (stat == XPRT_MOREREQS
|
|
&& pool->sp_state != SVCPOOL_CLOSING);
|
|
|
|
/*
|
|
* Move this transport to the end of the
|
|
* active list to ensure fairness when
|
|
* multiple transports are active. If this was
|
|
* the last queued request, svc_getreq will
|
|
* end up calling xprt_inactive to remove from
|
|
* the active list.
|
|
*/
|
|
xprt->xp_thread = NULL;
|
|
st->st_xprt = NULL;
|
|
if (xprt->xp_active) {
|
|
xprt_assignthread(xprt);
|
|
TAILQ_REMOVE(&pool->sp_active, xprt, xp_alink);
|
|
TAILQ_INSERT_TAIL(&pool->sp_active, xprt,
|
|
xp_alink);
|
|
}
|
|
mtx_unlock(&pool->sp_lock);
|
|
SVC_RELEASE(xprt);
|
|
mtx_lock(&pool->sp_lock);
|
|
}
|
|
|
|
/*
|
|
* Execute what we have queued.
|
|
*/
|
|
while ((rqstp = STAILQ_FIRST(&st->st_reqs)) != NULL) {
|
|
size_t sz = rqstp->rq_size;
|
|
mtx_unlock(&pool->sp_lock);
|
|
svc_executereq(rqstp);
|
|
mtx_lock(&pool->sp_lock);
|
|
pool->sp_space_used -= sz;
|
|
}
|
|
}
|
|
|
|
if (st->st_xprt) {
|
|
xprt = st->st_xprt;
|
|
st->st_xprt = NULL;
|
|
SVC_RELEASE(xprt);
|
|
}
|
|
|
|
KASSERT(STAILQ_EMPTY(&st->st_reqs), ("stray reqs on exit"));
|
|
LIST_REMOVE(st, st_link);
|
|
pool->sp_threadcount--;
|
|
|
|
mtx_unlock(&pool->sp_lock);
|
|
|
|
cv_destroy(&st->st_cond);
|
|
mem_free(st, sizeof(*st));
|
|
|
|
if (!ismaster)
|
|
wakeup(pool);
|
|
}
|
|
|
|
static void
|
|
svc_thread_start(void *arg)
|
|
{
|
|
|
|
svc_run_internal((SVCPOOL *) arg, FALSE);
|
|
kthread_exit();
|
|
}
|
|
|
|
static void
|
|
svc_new_thread(SVCPOOL *pool)
|
|
{
|
|
struct thread *td;
|
|
|
|
pool->sp_threadcount++;
|
|
kthread_add(svc_thread_start, pool,
|
|
pool->sp_proc, &td, 0, 0,
|
|
"%s: service", pool->sp_name);
|
|
}
|
|
|
|
void
|
|
svc_run(SVCPOOL *pool)
|
|
{
|
|
int i;
|
|
struct proc *p;
|
|
struct thread *td;
|
|
|
|
p = curproc;
|
|
td = curthread;
|
|
snprintf(td->td_name, sizeof(td->td_name),
|
|
"%s: master", pool->sp_name);
|
|
pool->sp_state = SVCPOOL_ACTIVE;
|
|
pool->sp_proc = p;
|
|
pool->sp_lastcreatetime = time_uptime;
|
|
pool->sp_threadcount = 1;
|
|
|
|
for (i = 1; i < pool->sp_minthreads; i++) {
|
|
svc_new_thread(pool);
|
|
}
|
|
|
|
svc_run_internal(pool, TRUE);
|
|
|
|
mtx_lock(&pool->sp_lock);
|
|
while (pool->sp_threadcount > 0)
|
|
msleep(pool, &pool->sp_lock, 0, "svcexit", 0);
|
|
mtx_unlock(&pool->sp_lock);
|
|
}
|
|
|
|
void
|
|
svc_exit(SVCPOOL *pool)
|
|
{
|
|
SVCTHREAD *st;
|
|
|
|
mtx_lock(&pool->sp_lock);
|
|
|
|
pool->sp_state = SVCPOOL_CLOSING;
|
|
LIST_FOREACH(st, &pool->sp_idlethreads, st_ilink)
|
|
cv_signal(&st->st_cond);
|
|
|
|
mtx_unlock(&pool->sp_lock);
|
|
}
|
|
|
|
bool_t
|
|
svc_getargs(struct svc_req *rqstp, xdrproc_t xargs, void *args)
|
|
{
|
|
struct mbuf *m;
|
|
XDR xdrs;
|
|
bool_t stat;
|
|
|
|
m = rqstp->rq_args;
|
|
rqstp->rq_args = NULL;
|
|
|
|
xdrmbuf_create(&xdrs, m, XDR_DECODE);
|
|
stat = xargs(&xdrs, args);
|
|
XDR_DESTROY(&xdrs);
|
|
|
|
return (stat);
|
|
}
|
|
|
|
bool_t
|
|
svc_freeargs(struct svc_req *rqstp, xdrproc_t xargs, void *args)
|
|
{
|
|
XDR xdrs;
|
|
|
|
if (rqstp->rq_addr) {
|
|
free(rqstp->rq_addr, M_SONAME);
|
|
rqstp->rq_addr = NULL;
|
|
}
|
|
|
|
xdrs.x_op = XDR_FREE;
|
|
return (xargs(&xdrs, args));
|
|
}
|
|
|
|
void
|
|
svc_freereq(struct svc_req *rqstp)
|
|
{
|
|
SVCTHREAD *st;
|
|
SVCXPRT *xprt;
|
|
SVCPOOL *pool;
|
|
|
|
st = rqstp->rq_thread;
|
|
xprt = rqstp->rq_xprt;
|
|
if (xprt)
|
|
pool = xprt->xp_pool;
|
|
else
|
|
pool = NULL;
|
|
if (st) {
|
|
mtx_lock(&pool->sp_lock);
|
|
KASSERT(rqstp == STAILQ_FIRST(&st->st_reqs),
|
|
("Freeing request out of order"));
|
|
STAILQ_REMOVE_HEAD(&st->st_reqs, rq_link);
|
|
st->st_reqcount--;
|
|
if (pool->sp_done)
|
|
pool->sp_done(st, rqstp);
|
|
mtx_unlock(&pool->sp_lock);
|
|
}
|
|
|
|
if (rqstp->rq_auth.svc_ah_ops)
|
|
SVCAUTH_RELEASE(&rqstp->rq_auth);
|
|
|
|
if (rqstp->rq_xprt) {
|
|
SVC_RELEASE(rqstp->rq_xprt);
|
|
}
|
|
|
|
if (rqstp->rq_addr)
|
|
free(rqstp->rq_addr, M_SONAME);
|
|
|
|
if (rqstp->rq_args)
|
|
m_freem(rqstp->rq_args);
|
|
|
|
free(rqstp, M_RPC);
|
|
}
|