9535efc00d
- Lock down low hanging fruit use of sb_flags with socket buffer lock. - Lock down low hanging fruit use of so_state with socket lock. - Lock down low hanging fruit use of so_options. - Lock down low-hanging fruit use of sb_lowwat and sb_hiwat with socket buffer lock. - Annotate situations in which we unlock the socket lock and then grab the receive socket buffer lock, which are currently actually the same lock. Depending on how we want to play our cards, we may want to coallesce these lock uses to reduce overhead. - Convert a if()->panic() into a KASSERT relating to so_state in soaccept(). - Remove a number of splnet()/splx() references. More complex merging of socket and socket buffer locking to follow.
748 lines
19 KiB
C
748 lines
19 KiB
C
/*
|
|
* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95
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*/
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|
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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|
|
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#include "opt_inet6.h"
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#include "opt_mac.h"
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|
|
|
#include <sys/param.h>
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#include <sys/systm.h>
|
|
#include <sys/sysproto.h>
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|
#include <sys/kernel.h>
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|
#include <sys/sysctl.h>
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|
#include <sys/file.h>
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|
#include <sys/filedesc.h>
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|
#include <sys/vnode.h>
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|
#include <sys/mac.h>
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|
#include <sys/malloc.h>
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|
#include <sys/mount.h>
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|
#include <sys/proc.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
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|
#include <sys/mbuf.h>
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|
#include <sys/socket.h>
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|
#include <sys/socketvar.h>
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|
#include <sys/domain.h>
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|
#include <sys/protosw.h>
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|
#include <sys/namei.h>
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|
#include <sys/fcntl.h>
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#include <sys/lockf.h>
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|
|
|
#include <netinet/in.h>
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#include <netinet/tcp.h>
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|
#ifdef INET6
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|
#include <net/if.h>
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#include <netinet6/in6_var.h>
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#endif
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#include <nfs/xdr_subs.h>
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|
#include <nfs/rpcv2.h>
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|
#include <nfs/nfsproto.h>
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|
#include <nfsserver/nfs.h>
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|
#include <nfsserver/nfsm_subs.h>
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|
#include <nfsserver/nfsrvcache.h>
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|
|
|
static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
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|
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MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor");
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MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure");
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|
|
|
|
|
#define TRUE 1
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#define FALSE 0
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|
|
|
SYSCTL_DECL(_vfs_nfsrv);
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|
|
|
int nfsd_waiting = 0;
|
|
int nfsrv_numnfsd = 0;
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|
static int notstarted = 1;
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|
|
|
static int nfs_privport = 0;
|
|
SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW,
|
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&nfs_privport, 0, "");
|
|
SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW,
|
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&nfsrvw_procrastinate, 0, "");
|
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SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW,
|
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&nfsrvw_procrastinate_v3, 0, "");
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|
|
|
static int nfssvc_addsock(struct file *, struct sockaddr *,
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struct thread *);
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static void nfsrv_zapsock(struct nfssvc_sock *slp);
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static int nfssvc_nfsd(struct thread *);
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|
|
|
/*
|
|
* NFS server system calls
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|
*/
|
|
|
|
/*
|
|
* Nfs server psuedo system call for the nfsd's
|
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* Based on the flag value it either:
|
|
* - adds a socket to the selection list
|
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* - remains in the kernel as an nfsd
|
|
* - remains in the kernel as an nfsiod
|
|
* For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets
|
|
* and that mountd provides
|
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* - sockaddr with no IPv4-mapped addresses
|
|
* - mask for both INET and INET6 families if there is IPv4-mapped overlap
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|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
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|
struct nfssvc_args {
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|
int flag;
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|
caddr_t argp;
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|
};
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|
#endif
|
|
/*
|
|
* MPSAFE
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|
*/
|
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int
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|
nfssvc(struct thread *td, struct nfssvc_args *uap)
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|
{
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struct file *fp;
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|
struct sockaddr *nam;
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|
struct nfsd_args nfsdarg;
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|
int error;
|
|
|
|
KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant"));
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|
|
|
#ifdef MAC
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|
error = mac_check_system_nfsd(td->td_ucred);
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|
if (error)
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|
return (error);
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|
#endif
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error = suser(td);
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|
if (error)
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|
return (error);
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NET_LOCK_GIANT();
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|
NFSD_LOCK();
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while (nfssvc_sockhead_flag & SLP_INIT) {
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nfssvc_sockhead_flag |= SLP_WANTINIT;
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(void) msleep(&nfssvc_sockhead, &nfsd_mtx, PSOCK,
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"nfsd init", 0);
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}
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NFSD_UNLOCK();
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if (uap->flag & NFSSVC_ADDSOCK) {
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error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
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if (error)
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|
goto done2;
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|
if ((error = fget(td, nfsdarg.sock, &fp)) != 0)
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goto done2;
|
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if (fp->f_type != DTYPE_SOCKET) {
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|
fdrop(fp, td);
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goto done2;
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|
}
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|
/*
|
|
* Get the client address for connected sockets.
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|
*/
|
|
if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
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nam = NULL;
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else {
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|
error = getsockaddr(&nam, nfsdarg.name,
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nfsdarg.namelen);
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|
if (error) {
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|
fdrop(fp, td);
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goto done2;
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|
}
|
|
}
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|
error = nfssvc_addsock(fp, nam, td);
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|
fdrop(fp, td);
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} else if (uap->flag & NFSSVC_NFSD) {
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error = nfssvc_nfsd(td);
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|
} else {
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error = ENXIO;
|
|
}
|
|
if (error == EINTR || error == ERESTART)
|
|
error = 0;
|
|
done2:
|
|
NET_UNLOCK_GIANT();
|
|
return (error);
|
|
}
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|
|
|
/*
|
|
* Adds a socket to the list for servicing by nfsds.
|
|
*/
|
|
static int
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nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
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{
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|
int siz;
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struct nfssvc_sock *slp;
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struct socket *so;
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int error, s;
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|
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NET_ASSERT_GIANT();
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|
so = fp->f_data;
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#if 0
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/*
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|
* XXXRW: If this code is ever enabled, there's a race when running
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* MPSAFE.
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|
*/
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tslp = NULL;
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/*
|
|
* Add it to the list, as required.
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*/
|
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if (so->so_proto->pr_protocol == IPPROTO_UDP) {
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tslp = nfs_udpsock;
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if (tslp->ns_flag & SLP_VALID) {
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if (mynam != NULL)
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FREE(mynam, M_SONAME);
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return (EPERM);
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}
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}
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#endif
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if (so->so_type == SOCK_STREAM)
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siz = NFS_MAXPACKET + sizeof (u_long);
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else
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siz = NFS_MAXPACKET;
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error = soreserve(so, siz, siz);
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if (error) {
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if (mynam != NULL)
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FREE(mynam, M_SONAME);
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return (error);
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|
}
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|
|
/*
|
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* Set protocol specific options { for now TCP only } and
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* reserve some space. For datagram sockets, this can get called
|
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* repeatedly for the same socket, but that isn't harmful.
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*/
|
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if (so->so_type == SOCK_STREAM) {
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struct sockopt sopt;
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int val;
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bzero(&sopt, sizeof sopt);
|
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sopt.sopt_dir = SOPT_SET;
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sopt.sopt_level = SOL_SOCKET;
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sopt.sopt_name = SO_KEEPALIVE;
|
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sopt.sopt_val = &val;
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sopt.sopt_valsize = sizeof val;
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val = 1;
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sosetopt(so, &sopt);
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}
|
|
if (so->so_proto->pr_protocol == IPPROTO_TCP) {
|
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struct sockopt sopt;
|
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int val;
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bzero(&sopt, sizeof sopt);
|
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sopt.sopt_dir = SOPT_SET;
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sopt.sopt_level = IPPROTO_TCP;
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sopt.sopt_name = TCP_NODELAY;
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sopt.sopt_val = &val;
|
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sopt.sopt_valsize = sizeof val;
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val = 1;
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sosetopt(so, &sopt);
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|
}
|
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SOCKBUF_LOCK(&so->so_rcv);
|
|
so->so_rcv.sb_flags &= ~SB_NOINTR;
|
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so->so_rcv.sb_timeo = 0;
|
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SOCKBUF_UNLOCK(&so->so_rcv);
|
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SOCKBUF_LOCK(&so->so_snd);
|
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so->so_snd.sb_flags &= ~SB_NOINTR;
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so->so_snd.sb_timeo = 0;
|
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SOCKBUF_UNLOCK(&so->so_snd);
|
|
|
|
slp = (struct nfssvc_sock *)
|
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malloc(sizeof (struct nfssvc_sock), M_NFSSVC,
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M_WAITOK | M_ZERO);
|
|
STAILQ_INIT(&slp->ns_rec);
|
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NFSD_LOCK();
|
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TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
|
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|
|
slp->ns_so = so;
|
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slp->ns_nam = mynam;
|
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fhold(fp);
|
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slp->ns_fp = fp;
|
|
/*
|
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* XXXRW: Socket locking here?
|
|
*/
|
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s = splnet();
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so->so_upcallarg = (caddr_t)slp;
|
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so->so_upcall = nfsrv_rcv;
|
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SOCKBUF_LOCK(&so->so_rcv);
|
|
so->so_rcv.sb_flags |= SB_UPCALL;
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
|
|
nfsrv_wakenfsd(slp);
|
|
splx(s);
|
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NFSD_UNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Called by nfssvc() for nfsds. Just loops around servicing rpc requests
|
|
* until it is killed by a signal.
|
|
*/
|
|
static int
|
|
nfssvc_nfsd(struct thread *td)
|
|
{
|
|
int siz;
|
|
struct nfssvc_sock *slp;
|
|
struct nfsd *nfsd;
|
|
struct nfsrv_descript *nd = NULL;
|
|
struct mbuf *m, *mreq;
|
|
int error = 0, cacherep, s, sotype, writes_todo;
|
|
int procrastinate;
|
|
u_quad_t cur_usec;
|
|
|
|
NET_ASSERT_GIANT();
|
|
|
|
#ifndef nolint
|
|
cacherep = RC_DOIT;
|
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writes_todo = 0;
|
|
#endif
|
|
nfsd = (struct nfsd *)
|
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malloc(sizeof (struct nfsd), M_NFSD, M_WAITOK | M_ZERO);
|
|
s = splnet();
|
|
NFSD_LOCK();
|
|
|
|
nfsd->nfsd_td = td;
|
|
TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
|
|
nfsrv_numnfsd++;
|
|
|
|
/*
|
|
* Loop getting rpc requests until SIGKILL.
|
|
*/
|
|
for (;;) {
|
|
if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
|
|
while (nfsd->nfsd_slp == NULL &&
|
|
(nfsd_head_flag & NFSD_CHECKSLP) == 0) {
|
|
nfsd->nfsd_flag |= NFSD_WAITING;
|
|
nfsd_waiting++;
|
|
error = msleep(nfsd, &nfsd_mtx,
|
|
PSOCK | PCATCH, "-", 0);
|
|
nfsd_waiting--;
|
|
if (error)
|
|
goto done;
|
|
}
|
|
if (nfsd->nfsd_slp == NULL &&
|
|
(nfsd_head_flag & NFSD_CHECKSLP) != 0) {
|
|
TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
|
|
if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
|
|
== (SLP_VALID | SLP_DOREC)) {
|
|
slp->ns_flag &= ~SLP_DOREC;
|
|
slp->ns_sref++;
|
|
nfsd->nfsd_slp = slp;
|
|
break;
|
|
}
|
|
}
|
|
if (slp == NULL)
|
|
nfsd_head_flag &= ~NFSD_CHECKSLP;
|
|
}
|
|
if ((slp = nfsd->nfsd_slp) == NULL)
|
|
continue;
|
|
if (slp->ns_flag & SLP_VALID) {
|
|
if (slp->ns_flag & SLP_DISCONN)
|
|
nfsrv_zapsock(slp);
|
|
else if (slp->ns_flag & SLP_NEEDQ) {
|
|
slp->ns_flag &= ~SLP_NEEDQ;
|
|
(void) nfs_slplock(slp, 1);
|
|
NFSD_UNLOCK();
|
|
nfsrv_rcv(slp->ns_so, (caddr_t)slp,
|
|
M_TRYWAIT);
|
|
NFSD_LOCK();
|
|
nfs_slpunlock(slp);
|
|
}
|
|
error = nfsrv_dorec(slp, nfsd, &nd);
|
|
cur_usec = nfs_curusec();
|
|
if (error && LIST_FIRST(&slp->ns_tq) &&
|
|
LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) {
|
|
error = 0;
|
|
cacherep = RC_DOIT;
|
|
writes_todo = 1;
|
|
} else
|
|
writes_todo = 0;
|
|
nfsd->nfsd_flag |= NFSD_REQINPROG;
|
|
}
|
|
} else {
|
|
error = 0;
|
|
slp = nfsd->nfsd_slp;
|
|
}
|
|
if (error || (slp->ns_flag & SLP_VALID) == 0) {
|
|
if (nd) {
|
|
free((caddr_t)nd, M_NFSRVDESC);
|
|
nd = NULL;
|
|
}
|
|
nfsd->nfsd_slp = NULL;
|
|
nfsd->nfsd_flag &= ~NFSD_REQINPROG;
|
|
nfsrv_slpderef(slp);
|
|
continue;
|
|
}
|
|
splx(s);
|
|
sotype = slp->ns_so->so_type;
|
|
if (nd) {
|
|
getmicrotime(&nd->nd_starttime);
|
|
if (nd->nd_nam2)
|
|
nd->nd_nam = nd->nd_nam2;
|
|
else
|
|
nd->nd_nam = slp->ns_nam;
|
|
|
|
/*
|
|
* Check to see if authorization is needed.
|
|
*/
|
|
cacherep = nfsrv_getcache(nd, &mreq);
|
|
|
|
if (nfs_privport) {
|
|
/* Check if source port is privileged */
|
|
u_short port;
|
|
struct sockaddr *nam = nd->nd_nam;
|
|
struct sockaddr_in *sin;
|
|
|
|
sin = (struct sockaddr_in *)nam;
|
|
/*
|
|
* INET/INET6 - same code:
|
|
* sin_port and sin6_port are at same offset
|
|
*/
|
|
port = ntohs(sin->sin_port);
|
|
if (port >= IPPORT_RESERVED &&
|
|
nd->nd_procnum != NFSPROC_NULL) {
|
|
#if defined(INET6) && defined(KLD_MODULE)
|
|
/* do not use ip6_sprintf: the nfs module should work without INET6 */
|
|
char b6[INET6_ADDRSTRLEN];
|
|
#define ip6_sprintf(a) \
|
|
(sprintf(b6, "%x:%x:%x:%x:%x:%x:%x:%x", \
|
|
(a)->s6_addr16[0], (a)->s6_addr16[1], \
|
|
(a)->s6_addr16[2], (a)->s6_addr16[3], \
|
|
(a)->s6_addr16[4], (a)->s6_addr16[5], \
|
|
(a)->s6_addr16[6], (a)->s6_addr16[7]), \
|
|
b6)
|
|
#endif
|
|
nd->nd_procnum = NFSPROC_NOOP;
|
|
nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
|
|
cacherep = RC_DOIT;
|
|
printf("NFS request from unprivileged port (%s:%d)\n",
|
|
#ifdef INET6
|
|
sin->sin_family == AF_INET6 ?
|
|
ip6_sprintf(&satosin6(sin)->sin6_addr) :
|
|
#undef ip6_sprintf
|
|
#endif
|
|
inet_ntoa(sin->sin_addr), port);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Loop to get all the write rpc relies that have been
|
|
* gathered together.
|
|
*/
|
|
do {
|
|
switch (cacherep) {
|
|
case RC_DOIT:
|
|
if (nd && (nd->nd_flag & ND_NFSV3))
|
|
procrastinate = nfsrvw_procrastinate_v3;
|
|
else
|
|
procrastinate = nfsrvw_procrastinate;
|
|
if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
|
|
procrastinate > 0 && !notstarted))
|
|
error = nfsrv_writegather(&nd, slp,
|
|
nfsd->nfsd_td, &mreq);
|
|
else
|
|
error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
|
|
slp, nfsd->nfsd_td, &mreq);
|
|
if (mreq == NULL)
|
|
break;
|
|
if (error != 0 && error != NFSERR_RETVOID) {
|
|
nfsrvstats.srv_errs++;
|
|
nfsrv_updatecache(nd, FALSE, mreq);
|
|
if (nd->nd_nam2)
|
|
FREE(nd->nd_nam2, M_SONAME);
|
|
break;
|
|
}
|
|
nfsrvstats.srvrpccnt[nd->nd_procnum]++;
|
|
nfsrv_updatecache(nd, TRUE, mreq);
|
|
nd->nd_mrep = NULL;
|
|
/* FALLTHROUGH */
|
|
case RC_REPLY:
|
|
NFSD_UNLOCK();
|
|
siz = m_length(mreq, NULL);
|
|
if (siz <= 0 || siz > NFS_MAXPACKET) {
|
|
printf("mbuf siz=%d\n",siz);
|
|
panic("Bad nfs svc reply");
|
|
}
|
|
m = mreq;
|
|
m->m_pkthdr.len = siz;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
/*
|
|
* For stream protocols, prepend a Sun RPC
|
|
* Record Mark.
|
|
*/
|
|
if (sotype == SOCK_STREAM) {
|
|
M_PREPEND(m, NFSX_UNSIGNED, M_TRYWAIT);
|
|
*mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
|
|
}
|
|
NFSD_LOCK();
|
|
if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
|
|
(void) nfs_slplock(slp, 1);
|
|
if (slp->ns_flag & SLP_VALID) {
|
|
NFSD_UNLOCK();
|
|
error = nfsrv_send(slp->ns_so, nd->nd_nam2, m);
|
|
NFSD_LOCK();
|
|
} else {
|
|
error = EPIPE;
|
|
m_freem(m);
|
|
}
|
|
if (nd->nd_nam2)
|
|
FREE(nd->nd_nam2, M_SONAME);
|
|
if (nd->nd_mrep)
|
|
m_freem(nd->nd_mrep);
|
|
if (error == EPIPE)
|
|
nfsrv_zapsock(slp);
|
|
if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
|
|
nfs_slpunlock(slp);
|
|
if (error == EINTR || error == ERESTART) {
|
|
free((caddr_t)nd, M_NFSRVDESC);
|
|
nfsrv_slpderef(slp);
|
|
s = splnet();
|
|
goto done;
|
|
}
|
|
break;
|
|
case RC_DROPIT:
|
|
m_freem(nd->nd_mrep);
|
|
if (nd->nd_nam2)
|
|
FREE(nd->nd_nam2, M_SONAME);
|
|
break;
|
|
};
|
|
if (nd) {
|
|
FREE((caddr_t)nd, M_NFSRVDESC);
|
|
nd = NULL;
|
|
}
|
|
|
|
/*
|
|
* Check to see if there are outstanding writes that
|
|
* need to be serviced.
|
|
*/
|
|
cur_usec = nfs_curusec();
|
|
s = splsoftclock();
|
|
if (LIST_FIRST(&slp->ns_tq) &&
|
|
LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) {
|
|
cacherep = RC_DOIT;
|
|
writes_todo = 1;
|
|
} else
|
|
writes_todo = 0;
|
|
splx(s);
|
|
} while (writes_todo);
|
|
s = splnet();
|
|
if (nfsrv_dorec(slp, nfsd, &nd)) {
|
|
nfsd->nfsd_flag &= ~NFSD_REQINPROG;
|
|
nfsd->nfsd_slp = NULL;
|
|
nfsrv_slpderef(slp);
|
|
}
|
|
KASSERT(!(debug_mpsafenet == 0 && !mtx_owned(&Giant)),
|
|
("nfssvc_nfsd(): debug.mpsafenet=0 && !Giant"));
|
|
KASSERT(!(debug_mpsafenet == 1 && mtx_owned(&Giant)),
|
|
("nfssvc_nfsd(): debug.mpsafenet=1 && Giant"));
|
|
}
|
|
done:
|
|
KASSERT(!(debug_mpsafenet == 0 && !mtx_owned(&Giant)),
|
|
("nfssvc_nfsd(): debug.mpsafenet=0 && !Giant"));
|
|
KASSERT(!(debug_mpsafenet == 1 && mtx_owned(&Giant)),
|
|
("nfssvc_nfsd(): debug.mpsafenet=1 && Giant"));
|
|
TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
|
|
splx(s);
|
|
free((caddr_t)nfsd, M_NFSD);
|
|
if (--nfsrv_numnfsd == 0)
|
|
nfsrv_init(TRUE); /* Reinitialize everything */
|
|
NFSD_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Shut down a socket associated with an nfssvc_sock structure.
|
|
* Should be called with the send lock set, if required.
|
|
* The trick here is to increment the sref at the start, so that the nfsds
|
|
* will stop using it and clear ns_flag at the end so that it will not be
|
|
* reassigned during cleanup.
|
|
*/
|
|
static void
|
|
nfsrv_zapsock(struct nfssvc_sock *slp)
|
|
{
|
|
struct nfsrv_descript *nwp, *nnwp;
|
|
struct socket *so;
|
|
struct file *fp;
|
|
struct nfsrv_rec *rec;
|
|
int s;
|
|
|
|
NET_ASSERT_GIANT();
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
/*
|
|
* XXXRW: By clearing all flags, other threads/etc should ignore
|
|
* this slp and we can safely release nfsd_mtx so we can clean
|
|
* up the slp safely.
|
|
*/
|
|
slp->ns_flag &= ~SLP_ALLFLAGS;
|
|
fp = slp->ns_fp;
|
|
if (fp) {
|
|
NFSD_UNLOCK();
|
|
slp->ns_fp = NULL;
|
|
so = slp->ns_so;
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
so->so_rcv.sb_flags &= ~SB_UPCALL;
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
so->so_upcall = NULL;
|
|
so->so_upcallarg = NULL;
|
|
soshutdown(so, SHUT_RDWR);
|
|
closef(fp, NULL);
|
|
NFSD_LOCK();
|
|
if (slp->ns_nam)
|
|
FREE(slp->ns_nam, M_SONAME);
|
|
m_freem(slp->ns_raw);
|
|
while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
|
|
STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
|
|
if (rec->nr_address)
|
|
FREE(rec->nr_address, M_SONAME);
|
|
m_freem(rec->nr_packet);
|
|
free(rec, M_NFSRVDESC);
|
|
}
|
|
s = splsoftclock();
|
|
for (nwp = LIST_FIRST(&slp->ns_tq); nwp; nwp = nnwp) {
|
|
nnwp = LIST_NEXT(nwp, nd_tq);
|
|
LIST_REMOVE(nwp, nd_tq);
|
|
free((caddr_t)nwp, M_NFSRVDESC);
|
|
}
|
|
LIST_INIT(&slp->ns_tq);
|
|
splx(s);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Derefence a server socket structure. If it has no more references and
|
|
* is no longer valid, you can throw it away.
|
|
*/
|
|
void
|
|
nfsrv_slpderef(struct nfssvc_sock *slp)
|
|
{
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
|
|
TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
|
|
free((caddr_t)slp, M_NFSSVC);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lock a socket against others.
|
|
*
|
|
* XXXRW: Wait argument is always 1 in the caller. Replace with a real
|
|
* sleep lock?
|
|
*/
|
|
int
|
|
nfs_slplock(struct nfssvc_sock *slp, int wait)
|
|
{
|
|
int *statep = &slp->ns_solock;
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
if (!wait && (*statep & NFSRV_SNDLOCK))
|
|
return(0); /* already locked, fail */
|
|
while (*statep & NFSRV_SNDLOCK) {
|
|
*statep |= NFSRV_WANTSND;
|
|
(void) msleep(statep, &nfsd_mtx, PZERO - 1, "nfsslplck", 0);
|
|
}
|
|
*statep |= NFSRV_SNDLOCK;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Unlock the stream socket for others.
|
|
*/
|
|
void
|
|
nfs_slpunlock(struct nfssvc_sock *slp)
|
|
{
|
|
int *statep = &slp->ns_solock;
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
if ((*statep & NFSRV_SNDLOCK) == 0)
|
|
panic("nfs slpunlock");
|
|
*statep &= ~NFSRV_SNDLOCK;
|
|
if (*statep & NFSRV_WANTSND) {
|
|
*statep &= ~NFSRV_WANTSND;
|
|
wakeup(statep);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize the data structures for the server.
|
|
* Handshake with any new nfsds starting up to avoid any chance of
|
|
* corruption.
|
|
*/
|
|
void
|
|
nfsrv_init(int terminating)
|
|
{
|
|
struct nfssvc_sock *slp, *nslp;
|
|
|
|
NET_ASSERT_GIANT();
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
if (nfssvc_sockhead_flag & SLP_INIT)
|
|
panic("nfsd init");
|
|
nfssvc_sockhead_flag |= SLP_INIT;
|
|
if (terminating) {
|
|
for (slp = TAILQ_FIRST(&nfssvc_sockhead); slp != NULL;
|
|
slp = nslp) {
|
|
nslp = TAILQ_NEXT(slp, ns_chain);
|
|
if (slp->ns_flag & SLP_VALID)
|
|
nfsrv_zapsock(slp);
|
|
TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
|
|
free((caddr_t)slp, M_NFSSVC);
|
|
}
|
|
nfsrv_cleancache(); /* And clear out server cache */
|
|
} else
|
|
nfs_pub.np_valid = 0;
|
|
|
|
TAILQ_INIT(&nfssvc_sockhead);
|
|
nfssvc_sockhead_flag &= ~SLP_INIT;
|
|
if (nfssvc_sockhead_flag & SLP_WANTINIT) {
|
|
nfssvc_sockhead_flag &= ~SLP_WANTINIT;
|
|
wakeup(&nfssvc_sockhead);
|
|
}
|
|
|
|
TAILQ_INIT(&nfsd_head);
|
|
nfsd_head_flag &= ~NFSD_CHECKSLP;
|
|
|
|
#if 0
|
|
nfs_udpsock = (struct nfssvc_sock *)
|
|
malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
|
|
STAILQ_INIT(&nfs_udpsock->ns_rec);
|
|
TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
|
|
|
|
nfs_cltpsock = (struct nfssvc_sock *)
|
|
malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
|
|
STAILQ_INIT(&nfs_cltpsock->ns_rec);
|
|
TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
|
|
#endif
|
|
}
|