79d2dfdaa6
user-mode lock manager, build a kernel with the NFSLOCKD option and add '-k' to 'rpc_lockd_flags' in rc.conf. Highlights include: * Thread-safe kernel RPC client - many threads can use the same RPC client handle safely with replies being de-multiplexed at the socket upcall (typically driven directly by the NIC interrupt) and handed off to whichever thread matches the reply. For UDP sockets, many RPC clients can share the same socket. This allows the use of a single privileged UDP port number to talk to an arbitrary number of remote hosts. * Single-threaded kernel RPC server. Adding support for multi-threaded server would be relatively straightforward and would follow approximately the Solaris KPI. A single thread should be sufficient for the NLM since it should rarely block in normal operation. * Kernel mode NLM server supporting cancel requests and granted callbacks. I've tested the NLM server reasonably extensively - it passes both my own tests and the NFS Connectathon locking tests running on Solaris, Mac OS X and Ubuntu Linux. * Userland NLM client supported. While the NLM server doesn't have support for the local NFS client's locking needs, it does have to field async replies and granted callbacks from remote NLMs that the local client has contacted. We relay these replies to the userland rpc.lockd over a local domain RPC socket. * Robust deadlock detection for the local lock manager. In particular it will detect deadlocks caused by a lock request that covers more than one blocking request. As required by the NLM protocol, all deadlock detection happens synchronously - a user is guaranteed that if a lock request isn't rejected immediately, the lock will eventually be granted. The old system allowed for a 'deferred deadlock' condition where a blocked lock request could wake up and find that some other deadlock-causing lock owner had beaten them to the lock. * Since both local and remote locks are managed by the same kernel locking code, local and remote processes can safely use file locks for mutual exclusion. Local processes have no fairness advantage compared to remote processes when contending to lock a region that has just been unlocked - the local lock manager enforces a strict first-come first-served model for both local and remote lockers. Sponsored by: Isilon Systems PR: 95247 107555 115524 116679 MFC after: 2 weeks
349 lines
8.3 KiB
C
349 lines
8.3 KiB
C
/* $NetBSD: rpc_prot.c,v 1.16 2000/06/02 23:11:13 fvdl 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 = "@(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)rpc_prot.c 2.3 88/08/07 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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* rpc_prot.c
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* This set of routines implements the rpc message definition,
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* its serializer and some common rpc utility routines.
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* The routines are meant for various implementations of rpc -
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* they are NOT for the rpc client or rpc service implementations!
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* Because authentication stuff is easy and is part of rpc, the opaque
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* routines are also in this program.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <rpc/auth.h>
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#include <rpc/clnt.h>
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#include <rpc/rpc_msg.h>
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MALLOC_DEFINE(M_RPC, "rpc", "Remote Procedure Call");
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#define assert(exp) KASSERT(exp, ("bad arguments"))
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static void accepted(enum accept_stat, struct rpc_err *);
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static void rejected(enum reject_stat, struct rpc_err *);
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/* * * * * * * * * * * * * * XDR Authentication * * * * * * * * * * * */
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struct opaque_auth _null_auth;
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/*
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* XDR an opaque authentication struct
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* (see auth.h)
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*/
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bool_t
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xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap)
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{
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assert(xdrs != NULL);
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assert(ap != NULL);
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if (xdr_enum(xdrs, &(ap->oa_flavor)))
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return (xdr_bytes(xdrs, &ap->oa_base,
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&ap->oa_length, MAX_AUTH_BYTES));
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return (FALSE);
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}
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/* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */
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/*
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* XDR the MSG_ACCEPTED part of a reply message union
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*/
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bool_t
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xdr_accepted_reply(XDR *xdrs, struct accepted_reply *ar)
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{
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enum accept_stat *par_stat;
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assert(xdrs != NULL);
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assert(ar != NULL);
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par_stat = &ar->ar_stat;
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/* personalized union, rather than calling xdr_union */
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if (! xdr_opaque_auth(xdrs, &(ar->ar_verf)))
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return (FALSE);
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if (! xdr_enum(xdrs, (enum_t *) par_stat))
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return (FALSE);
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switch (ar->ar_stat) {
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case SUCCESS:
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return ((*(ar->ar_results.proc))(xdrs, ar->ar_results.where));
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case PROG_MISMATCH:
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if (! xdr_uint32_t(xdrs, &(ar->ar_vers.low)))
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return (FALSE);
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return (xdr_uint32_t(xdrs, &(ar->ar_vers.high)));
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case GARBAGE_ARGS:
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case SYSTEM_ERR:
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case PROC_UNAVAIL:
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case PROG_UNAVAIL:
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break;
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}
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return (TRUE); /* TRUE => open ended set of problems */
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}
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/*
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* XDR the MSG_DENIED part of a reply message union
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*/
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bool_t
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xdr_rejected_reply(XDR *xdrs, struct rejected_reply *rr)
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{
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enum reject_stat *prj_stat;
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enum auth_stat *prj_why;
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assert(xdrs != NULL);
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assert(rr != NULL);
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prj_stat = &rr->rj_stat;
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/* personalized union, rather than calling xdr_union */
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if (! xdr_enum(xdrs, (enum_t *) prj_stat))
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return (FALSE);
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switch (rr->rj_stat) {
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case RPC_MISMATCH:
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if (! xdr_uint32_t(xdrs, &(rr->rj_vers.low)))
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return (FALSE);
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return (xdr_uint32_t(xdrs, &(rr->rj_vers.high)));
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case AUTH_ERROR:
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prj_why = &rr->rj_why;
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return (xdr_enum(xdrs, (enum_t *) prj_why));
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}
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/* NOTREACHED */
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assert(0);
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return (FALSE);
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}
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static const struct xdr_discrim reply_dscrm[3] = {
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{ (int)MSG_ACCEPTED, (xdrproc_t)xdr_accepted_reply },
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{ (int)MSG_DENIED, (xdrproc_t)xdr_rejected_reply },
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{ __dontcare__, NULL_xdrproc_t } };
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/*
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* XDR a reply message
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*/
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bool_t
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xdr_replymsg(XDR *xdrs, struct rpc_msg *rmsg)
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{
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enum msg_type *prm_direction;
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enum reply_stat *prp_stat;
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assert(xdrs != NULL);
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assert(rmsg != NULL);
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prm_direction = &rmsg->rm_direction;
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prp_stat = &rmsg->rm_reply.rp_stat;
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if (
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xdr_uint32_t(xdrs, &(rmsg->rm_xid)) &&
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xdr_enum(xdrs, (enum_t *) prm_direction) &&
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(rmsg->rm_direction == REPLY) )
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return (xdr_union(xdrs, (enum_t *) prp_stat,
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(caddr_t)(void *)&(rmsg->rm_reply.ru), reply_dscrm,
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NULL_xdrproc_t));
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return (FALSE);
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}
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/*
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* Serializes the "static part" of a call message header.
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* The fields include: rm_xid, rm_direction, rpcvers, prog, and vers.
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* The rm_xid is not really static, but the user can easily munge on the fly.
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*/
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bool_t
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xdr_callhdr(XDR *xdrs, struct rpc_msg *cmsg)
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{
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enum msg_type *prm_direction;
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assert(xdrs != NULL);
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assert(cmsg != NULL);
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prm_direction = &cmsg->rm_direction;
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cmsg->rm_direction = CALL;
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cmsg->rm_call.cb_rpcvers = RPC_MSG_VERSION;
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if (
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(xdrs->x_op == XDR_ENCODE) &&
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xdr_uint32_t(xdrs, &(cmsg->rm_xid)) &&
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xdr_enum(xdrs, (enum_t *) prm_direction) &&
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xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
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xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_prog)) )
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return (xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_vers)));
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return (FALSE);
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}
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/* ************************** Client utility routine ************* */
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static void
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accepted(enum accept_stat acpt_stat, struct rpc_err *error)
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{
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assert(error != NULL);
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switch (acpt_stat) {
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case PROG_UNAVAIL:
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error->re_status = RPC_PROGUNAVAIL;
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return;
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case PROG_MISMATCH:
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error->re_status = RPC_PROGVERSMISMATCH;
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return;
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case PROC_UNAVAIL:
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error->re_status = RPC_PROCUNAVAIL;
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return;
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case GARBAGE_ARGS:
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error->re_status = RPC_CANTDECODEARGS;
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return;
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case SYSTEM_ERR:
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error->re_status = RPC_SYSTEMERROR;
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return;
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case SUCCESS:
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error->re_status = RPC_SUCCESS;
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return;
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}
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/* NOTREACHED */
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/* something's wrong, but we don't know what ... */
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error->re_status = RPC_FAILED;
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error->re_lb.s1 = (int32_t)MSG_ACCEPTED;
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error->re_lb.s2 = (int32_t)acpt_stat;
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}
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static void
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rejected(enum reject_stat rjct_stat, struct rpc_err *error)
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{
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assert(error != NULL);
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switch (rjct_stat) {
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case RPC_MISMATCH:
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error->re_status = RPC_VERSMISMATCH;
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return;
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case AUTH_ERROR:
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error->re_status = RPC_AUTHERROR;
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return;
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}
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/* something's wrong, but we don't know what ... */
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/* NOTREACHED */
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error->re_status = RPC_FAILED;
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error->re_lb.s1 = (int32_t)MSG_DENIED;
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error->re_lb.s2 = (int32_t)rjct_stat;
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}
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/*
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* given a reply message, fills in the error
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*/
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void
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_seterr_reply(struct rpc_msg *msg, struct rpc_err *error)
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{
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assert(msg != NULL);
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assert(error != NULL);
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/* optimized for normal, SUCCESSful case */
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switch (msg->rm_reply.rp_stat) {
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case MSG_ACCEPTED:
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if (msg->acpted_rply.ar_stat == SUCCESS) {
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error->re_status = RPC_SUCCESS;
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return;
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}
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accepted(msg->acpted_rply.ar_stat, error);
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break;
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case MSG_DENIED:
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rejected(msg->rjcted_rply.rj_stat, error);
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break;
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default:
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error->re_status = RPC_FAILED;
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error->re_lb.s1 = (int32_t)(msg->rm_reply.rp_stat);
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break;
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}
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switch (error->re_status) {
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case RPC_VERSMISMATCH:
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error->re_vers.low = msg->rjcted_rply.rj_vers.low;
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error->re_vers.high = msg->rjcted_rply.rj_vers.high;
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break;
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case RPC_AUTHERROR:
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error->re_why = msg->rjcted_rply.rj_why;
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break;
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case RPC_PROGVERSMISMATCH:
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error->re_vers.low = msg->acpted_rply.ar_vers.low;
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error->re_vers.high = msg->acpted_rply.ar_vers.high;
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break;
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case RPC_FAILED:
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case RPC_SUCCESS:
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case RPC_PROGNOTREGISTERED:
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case RPC_PMAPFAILURE:
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case RPC_UNKNOWNPROTO:
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case RPC_UNKNOWNHOST:
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case RPC_SYSTEMERROR:
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case RPC_CANTDECODEARGS:
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case RPC_PROCUNAVAIL:
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case RPC_PROGUNAVAIL:
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case RPC_TIMEDOUT:
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case RPC_CANTRECV:
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case RPC_CANTSEND:
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case RPC_CANTDECODERES:
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case RPC_CANTENCODEARGS:
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default:
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break;
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}
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}
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