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
717 lines
15 KiB
C
717 lines
15 KiB
C
/* $NetBSD: rpc_generic.c,v 1.4 2000/09/28 09:07:04 kleink 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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/*
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* Copyright (c) 1986-1991 by Sun Microsystems Inc.
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*/
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/* #pragma ident "@(#)rpc_generic.c 1.17 94/04/24 SMI" */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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|
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/*
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* rpc_generic.c, Miscl routines for RPC.
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*
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*/
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/sbuf.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/syslog.h>
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#include <rpc/rpc.h>
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#include <rpc/nettype.h>
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#include "rpc_com.h"
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struct handle {
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NCONF_HANDLE *nhandle;
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int nflag; /* Whether NETPATH or NETCONFIG */
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int nettype;
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};
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static const struct _rpcnettype {
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const char *name;
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const int type;
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} _rpctypelist[] = {
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{ "netpath", _RPC_NETPATH },
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{ "visible", _RPC_VISIBLE },
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{ "circuit_v", _RPC_CIRCUIT_V },
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{ "datagram_v", _RPC_DATAGRAM_V },
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{ "circuit_n", _RPC_CIRCUIT_N },
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{ "datagram_n", _RPC_DATAGRAM_N },
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{ "tcp", _RPC_TCP },
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{ "udp", _RPC_UDP },
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{ 0, _RPC_NONE }
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};
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struct netid_af {
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const char *netid;
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int af;
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int protocol;
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};
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static const struct netid_af na_cvt[] = {
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{ "udp", AF_INET, IPPROTO_UDP },
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{ "tcp", AF_INET, IPPROTO_TCP },
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#ifdef INET6
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{ "udp6", AF_INET6, IPPROTO_UDP },
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{ "tcp6", AF_INET6, IPPROTO_TCP },
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#endif
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{ "local", AF_LOCAL, 0 }
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};
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struct rpc_createerr rpc_createerr;
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/*
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* Find the appropriate buffer size
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*/
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u_int
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/*ARGSUSED*/
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__rpc_get_t_size(int af, int proto, int size)
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{
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int maxsize, defsize;
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maxsize = 256 * 1024; /* XXX */
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switch (proto) {
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case IPPROTO_TCP:
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defsize = 64 * 1024; /* XXX */
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break;
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case IPPROTO_UDP:
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defsize = UDPMSGSIZE;
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break;
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default:
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defsize = RPC_MAXDATASIZE;
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break;
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}
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if (size == 0)
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return defsize;
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/* Check whether the value is within the upper max limit */
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return (size > maxsize ? (u_int)maxsize : (u_int)size);
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}
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/*
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* Find the appropriate address buffer size
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*/
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u_int
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__rpc_get_a_size(af)
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int af;
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{
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switch (af) {
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case AF_INET:
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return sizeof (struct sockaddr_in);
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#ifdef INET6
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case AF_INET6:
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return sizeof (struct sockaddr_in6);
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#endif
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case AF_LOCAL:
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return sizeof (struct sockaddr_un);
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default:
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break;
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}
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return ((u_int)RPC_MAXADDRSIZE);
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}
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#if 0
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/*
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* Used to ping the NULL procedure for clnt handle.
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* Returns NULL if fails, else a non-NULL pointer.
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*/
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void *
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rpc_nullproc(clnt)
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CLIENT *clnt;
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{
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struct timeval TIMEOUT = {25, 0};
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if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
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(xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
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return (NULL);
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}
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return ((void *) clnt);
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}
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#endif
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int
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__rpc_socket2sockinfo(struct socket *so, struct __rpc_sockinfo *sip)
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{
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int type, proto;
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struct sockaddr *sa;
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sa_family_t family;
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struct sockopt opt;
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int error;
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error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
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if (error)
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return 0;
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sip->si_alen = sa->sa_len;
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family = sa->sa_family;
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free(sa, M_SONAME);
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opt.sopt_dir = SOPT_GET;
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opt.sopt_level = SOL_SOCKET;
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opt.sopt_name = SO_TYPE;
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opt.sopt_val = &type;
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opt.sopt_valsize = sizeof type;
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opt.sopt_td = NULL;
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error = sogetopt(so, &opt);
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if (error)
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return 0;
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/* XXX */
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if (family != AF_LOCAL) {
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if (type == SOCK_STREAM)
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proto = IPPROTO_TCP;
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else if (type == SOCK_DGRAM)
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proto = IPPROTO_UDP;
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else
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return 0;
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} else
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proto = 0;
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sip->si_af = family;
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sip->si_proto = proto;
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sip->si_socktype = type;
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return 1;
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}
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/*
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* Linear search, but the number of entries is small.
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*/
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int
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__rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
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{
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int i;
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for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
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if (strcmp(na_cvt[i].netid, nconf->nc_netid) == 0 || (
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strcmp(nconf->nc_netid, "unix") == 0 &&
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strcmp(na_cvt[i].netid, "local") == 0)) {
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sip->si_af = na_cvt[i].af;
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sip->si_proto = na_cvt[i].protocol;
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sip->si_socktype =
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__rpc_seman2socktype((int)nconf->nc_semantics);
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if (sip->si_socktype == -1)
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return 0;
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sip->si_alen = __rpc_get_a_size(sip->si_af);
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return 1;
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}
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return 0;
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}
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struct socket *
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__rpc_nconf2socket(const struct netconfig *nconf)
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{
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struct __rpc_sockinfo si;
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struct socket *so;
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int error;
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if (!__rpc_nconf2sockinfo(nconf, &si))
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return 0;
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so = NULL;
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error = socreate(si.si_af, &so, si.si_socktype, si.si_proto,
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curthread->td_ucred, curthread);
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if (error)
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return NULL;
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else
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return so;
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}
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char *
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taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
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{
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struct __rpc_sockinfo si;
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if (!__rpc_nconf2sockinfo(nconf, &si))
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return NULL;
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return __rpc_taddr2uaddr_af(si.si_af, nbuf);
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}
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struct netbuf *
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uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
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{
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struct __rpc_sockinfo si;
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if (!__rpc_nconf2sockinfo(nconf, &si))
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return NULL;
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return __rpc_uaddr2taddr_af(si.si_af, uaddr);
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}
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char *
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__rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
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{
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char *ret;
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struct sbuf sb;
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struct sockaddr_in *sin;
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struct sockaddr_un *sun;
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char namebuf[INET_ADDRSTRLEN];
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#ifdef INET6
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struct sockaddr_in6 *sin6;
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char namebuf6[INET6_ADDRSTRLEN];
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#endif
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u_int16_t port;
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sbuf_new(&sb, NULL, 0, SBUF_AUTOEXTEND);
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switch (af) {
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case AF_INET:
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sin = nbuf->buf;
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if (__rpc_inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
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== NULL)
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return NULL;
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port = ntohs(sin->sin_port);
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if (sbuf_printf(&sb, "%s.%u.%u", namebuf,
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((uint32_t)port) >> 8,
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port & 0xff) < 0)
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return NULL;
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break;
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#ifdef INET6
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case AF_INET6:
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sin6 = nbuf->buf;
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if (__rpc_inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
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== NULL)
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return NULL;
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port = ntohs(sin6->sin6_port);
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if (sbuf_printf(&sb, "%s.%u.%u", namebuf6,
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((uint32_t)port) >> 8,
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port & 0xff) < 0)
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return NULL;
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break;
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#endif
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case AF_LOCAL:
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sun = nbuf->buf;
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if (sbuf_printf(&sb, "%.*s", (int)(sun->sun_len -
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offsetof(struct sockaddr_un, sun_path)),
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sun->sun_path) < 0)
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return (NULL);
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break;
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default:
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return NULL;
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}
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sbuf_finish(&sb);
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ret = strdup(sbuf_data(&sb), M_RPC);
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sbuf_delete(&sb);
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return ret;
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}
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struct netbuf *
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__rpc_uaddr2taddr_af(int af, const char *uaddr)
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{
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struct netbuf *ret = NULL;
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char *addrstr, *p;
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unsigned port, portlo, porthi;
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struct sockaddr_in *sin;
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#ifdef INET6
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struct sockaddr_in6 *sin6;
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|
#endif
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struct sockaddr_un *sun;
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port = 0;
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sin = NULL;
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addrstr = strdup(uaddr, M_RPC);
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if (addrstr == NULL)
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return NULL;
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|
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/*
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* AF_LOCAL addresses are expected to be absolute
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* pathnames, anything else will be AF_INET or AF_INET6.
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*/
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if (*addrstr != '/') {
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p = strrchr(addrstr, '.');
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if (p == NULL)
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goto out;
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portlo = (unsigned)strtol(p + 1, NULL, 10);
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*p = '\0';
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p = strrchr(addrstr, '.');
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if (p == NULL)
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goto out;
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porthi = (unsigned)strtol(p + 1, NULL, 10);
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*p = '\0';
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port = (porthi << 8) | portlo;
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}
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ret = (struct netbuf *)malloc(sizeof *ret, M_RPC, M_WAITOK);
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if (ret == NULL)
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goto out;
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|
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switch (af) {
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case AF_INET:
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sin = (struct sockaddr_in *)malloc(sizeof *sin, M_RPC,
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M_WAITOK);
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if (sin == NULL)
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goto out;
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memset(sin, 0, sizeof *sin);
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sin->sin_family = AF_INET;
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sin->sin_port = htons(port);
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if (__rpc_inet_pton(AF_INET, addrstr, &sin->sin_addr) <= 0) {
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free(sin, M_RPC);
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free(ret, M_RPC);
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ret = NULL;
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goto out;
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|
}
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sin->sin_len = ret->maxlen = ret->len = sizeof *sin;
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ret->buf = sin;
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break;
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#ifdef INET6
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *)malloc(sizeof *sin6, M_RPC,
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M_WAITOK);
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if (sin6 == NULL)
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goto out;
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memset(sin6, 0, sizeof *sin6);
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = htons(port);
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if (__rpc_inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
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free(sin6, M_RPC);
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free(ret, M_RPC);
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ret = NULL;
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|
goto out;
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|
}
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sin6->sin6_len = ret->maxlen = ret->len = sizeof *sin6;
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ret->buf = sin6;
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|
break;
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|
#endif
|
|
case AF_LOCAL:
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sun = (struct sockaddr_un *)malloc(sizeof *sun, M_RPC,
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M_WAITOK);
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if (sun == NULL)
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goto out;
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memset(sun, 0, sizeof *sun);
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|
sun->sun_family = AF_LOCAL;
|
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strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
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ret->len = ret->maxlen = sun->sun_len = SUN_LEN(sun);
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|
ret->buf = sun;
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break;
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|
default:
|
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break;
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|
}
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out:
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free(addrstr, M_RPC);
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return ret;
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}
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|
|
int
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__rpc_seman2socktype(int semantics)
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|
{
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switch (semantics) {
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case NC_TPI_CLTS:
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|
return SOCK_DGRAM;
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|
case NC_TPI_COTS_ORD:
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return SOCK_STREAM;
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|
case NC_TPI_RAW:
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|
return SOCK_RAW;
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|
default:
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|
break;
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|
}
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|
|
|
return -1;
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|
}
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|
|
|
int
|
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__rpc_socktype2seman(int socktype)
|
|
{
|
|
switch (socktype) {
|
|
case SOCK_DGRAM:
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|
return NC_TPI_CLTS;
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|
case SOCK_STREAM:
|
|
return NC_TPI_COTS_ORD;
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|
case SOCK_RAW:
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|
return NC_TPI_RAW;
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|
default:
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|
break;
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|
}
|
|
|
|
return -1;
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|
}
|
|
|
|
/*
|
|
* Returns the type of the network as defined in <rpc/nettype.h>
|
|
* If nettype is NULL, it defaults to NETPATH.
|
|
*/
|
|
static int
|
|
getnettype(const char *nettype)
|
|
{
|
|
int i;
|
|
|
|
if ((nettype == NULL) || (nettype[0] == 0)) {
|
|
return (_RPC_NETPATH); /* Default */
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|
}
|
|
|
|
#if 0
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|
nettype = strlocase(nettype);
|
|
#endif
|
|
for (i = 0; _rpctypelist[i].name; i++)
|
|
if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
|
|
return (_rpctypelist[i].type);
|
|
}
|
|
return (_rpctypelist[i].type);
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|
}
|
|
|
|
/*
|
|
* For the given nettype (tcp or udp only), return the first structure found.
|
|
* This should be freed by calling freenetconfigent()
|
|
*/
|
|
struct netconfig *
|
|
__rpc_getconfip(const char *nettype)
|
|
{
|
|
char *netid;
|
|
static char *netid_tcp = (char *) NULL;
|
|
static char *netid_udp = (char *) NULL;
|
|
struct netconfig *dummy;
|
|
|
|
if (!netid_udp && !netid_tcp) {
|
|
struct netconfig *nconf;
|
|
void *confighandle;
|
|
|
|
if (!(confighandle = setnetconfig())) {
|
|
log(LOG_ERR, "rpc: failed to open " NETCONFIG);
|
|
return (NULL);
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|
}
|
|
while ((nconf = getnetconfig(confighandle)) != NULL) {
|
|
if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
|
|
if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
|
|
netid_tcp = strdup(nconf->nc_netid,
|
|
M_RPC);
|
|
} else
|
|
if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
|
|
netid_udp = strdup(nconf->nc_netid,
|
|
M_RPC);
|
|
}
|
|
}
|
|
}
|
|
endnetconfig(confighandle);
|
|
}
|
|
if (strcmp(nettype, "udp") == 0)
|
|
netid = netid_udp;
|
|
else if (strcmp(nettype, "tcp") == 0)
|
|
netid = netid_tcp;
|
|
else {
|
|
return (NULL);
|
|
}
|
|
if ((netid == NULL) || (netid[0] == 0)) {
|
|
return (NULL);
|
|
}
|
|
dummy = getnetconfigent(netid);
|
|
return (dummy);
|
|
}
|
|
|
|
/*
|
|
* Returns the type of the nettype, which should then be used with
|
|
* __rpc_getconf().
|
|
*
|
|
* For simplicity in the kernel, we don't support the NETPATH
|
|
* environment variable. We behave as userland would then NETPATH is
|
|
* unset, i.e. iterate over all visible entries in netconfig.
|
|
*/
|
|
void *
|
|
__rpc_setconf(nettype)
|
|
const char *nettype;
|
|
{
|
|
struct handle *handle;
|
|
|
|
handle = (struct handle *) malloc(sizeof (struct handle),
|
|
M_RPC, M_WAITOK);
|
|
switch (handle->nettype = getnettype(nettype)) {
|
|
case _RPC_NETPATH:
|
|
case _RPC_CIRCUIT_N:
|
|
case _RPC_DATAGRAM_N:
|
|
if (!(handle->nhandle = setnetconfig()))
|
|
goto failed;
|
|
handle->nflag = TRUE;
|
|
break;
|
|
case _RPC_VISIBLE:
|
|
case _RPC_CIRCUIT_V:
|
|
case _RPC_DATAGRAM_V:
|
|
case _RPC_TCP:
|
|
case _RPC_UDP:
|
|
if (!(handle->nhandle = setnetconfig())) {
|
|
log(LOG_ERR, "rpc: failed to open " NETCONFIG);
|
|
goto failed;
|
|
}
|
|
handle->nflag = FALSE;
|
|
break;
|
|
default:
|
|
goto failed;
|
|
}
|
|
|
|
return (handle);
|
|
|
|
failed:
|
|
free(handle, M_RPC);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Returns the next netconfig struct for the given "net" type.
|
|
* __rpc_setconf() should have been called previously.
|
|
*/
|
|
struct netconfig *
|
|
__rpc_getconf(void *vhandle)
|
|
{
|
|
struct handle *handle;
|
|
struct netconfig *nconf;
|
|
|
|
handle = (struct handle *)vhandle;
|
|
if (handle == NULL) {
|
|
return (NULL);
|
|
}
|
|
for (;;) {
|
|
if (handle->nflag) {
|
|
nconf = getnetconfig(handle->nhandle);
|
|
if (nconf && !(nconf->nc_flag & NC_VISIBLE))
|
|
continue;
|
|
} else {
|
|
nconf = getnetconfig(handle->nhandle);
|
|
}
|
|
if (nconf == NULL)
|
|
break;
|
|
if ((nconf->nc_semantics != NC_TPI_CLTS) &&
|
|
(nconf->nc_semantics != NC_TPI_COTS) &&
|
|
(nconf->nc_semantics != NC_TPI_COTS_ORD))
|
|
continue;
|
|
switch (handle->nettype) {
|
|
case _RPC_VISIBLE:
|
|
if (!(nconf->nc_flag & NC_VISIBLE))
|
|
continue;
|
|
/* FALLTHROUGH */
|
|
case _RPC_NETPATH: /* Be happy */
|
|
break;
|
|
case _RPC_CIRCUIT_V:
|
|
if (!(nconf->nc_flag & NC_VISIBLE))
|
|
continue;
|
|
/* FALLTHROUGH */
|
|
case _RPC_CIRCUIT_N:
|
|
if ((nconf->nc_semantics != NC_TPI_COTS) &&
|
|
(nconf->nc_semantics != NC_TPI_COTS_ORD))
|
|
continue;
|
|
break;
|
|
case _RPC_DATAGRAM_V:
|
|
if (!(nconf->nc_flag & NC_VISIBLE))
|
|
continue;
|
|
/* FALLTHROUGH */
|
|
case _RPC_DATAGRAM_N:
|
|
if (nconf->nc_semantics != NC_TPI_CLTS)
|
|
continue;
|
|
break;
|
|
case _RPC_TCP:
|
|
if (((nconf->nc_semantics != NC_TPI_COTS) &&
|
|
(nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
|
|
(strcmp(nconf->nc_protofmly, NC_INET)
|
|
#ifdef INET6
|
|
&& strcmp(nconf->nc_protofmly, NC_INET6))
|
|
#else
|
|
)
|
|
#endif
|
|
||
|
|
strcmp(nconf->nc_proto, NC_TCP))
|
|
continue;
|
|
break;
|
|
case _RPC_UDP:
|
|
if ((nconf->nc_semantics != NC_TPI_CLTS) ||
|
|
(strcmp(nconf->nc_protofmly, NC_INET)
|
|
#ifdef INET6
|
|
&& strcmp(nconf->nc_protofmly, NC_INET6))
|
|
#else
|
|
)
|
|
#endif
|
|
||
|
|
strcmp(nconf->nc_proto, NC_UDP))
|
|
continue;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return (nconf);
|
|
}
|
|
|
|
void
|
|
__rpc_endconf(vhandle)
|
|
void * vhandle;
|
|
{
|
|
struct handle *handle;
|
|
|
|
handle = (struct handle *) vhandle;
|
|
if (handle == NULL) {
|
|
return;
|
|
}
|
|
endnetconfig(handle->nhandle);
|
|
free(handle, M_RPC);
|
|
}
|
|
|
|
int
|
|
__rpc_sockisbound(struct socket *so)
|
|
{
|
|
struct sockaddr *sa;
|
|
int error, bound;
|
|
|
|
error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
|
|
if (error)
|
|
return (0);
|
|
|
|
switch (sa->sa_family) {
|
|
case AF_INET:
|
|
bound = (((struct sockaddr_in *) sa)->sin_port != 0);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
bound = (((struct sockaddr_in6 *) sa)->sin6_port != 0);
|
|
break;
|
|
#endif
|
|
case AF_LOCAL:
|
|
/* XXX check this */
|
|
bound = (((struct sockaddr_un *) sa)->sun_path[0] != '\0');
|
|
break;
|
|
default:
|
|
bound = FALSE;
|
|
break;
|
|
}
|
|
|
|
free(sa, M_SONAME);
|
|
|
|
return bound;
|
|
}
|