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freebsd/sys/nfsserver/nfs_syscalls.c
Garrett Wollman 57bf258e3d Fix all areas of the system (or at least all those in LINT) to avoid storing 
socket addresses in mbufs.  (Socket buffers are the one exception.)  A number
of kernel APIs needed to get fixed in order to make this happen.  Also,
fix three protocol families which kept PCBs in mbufs to not malloc them
instead.  Delete some old compatibility cruft while we're at it, and add
some new routines in the in_cksum family.
1997-08-16 19:16:27 +00:00

1196 lines
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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95
* $Id: nfs_syscalls.c,v 1.26 1997/07/16 09:06:29 dfr Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/namei.h>
#include <sys/syslog.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#ifdef ISO
#include <netiso/iso.h>
#endif
#include <nfs/xdr_subs.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsrvcache.h>
#include <nfs/nfsmount.h>
#include <nfs/nfsnode.h>
#include <nfs/nqnfs.h>
#include <nfs/nfsrtt.h>
/* Global defs. */
extern int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *nd,
struct nfssvc_sock *slp,
struct proc *procp,
struct mbuf **mreqp));
extern int nfs_numasync;
extern time_t nqnfsstarttime;
extern int nqsrv_writeslack;
extern int nfsrtton;
extern struct nfsstats nfsstats;
extern int nfsrvw_procrastinate;
extern int nfsrvw_procrastinate_v3;
struct nfssvc_sock *nfs_udpsock, *nfs_cltpsock;
static int nuidhash_max = NFS_MAXUIDHASH;
static void nfsrv_zapsock __P((struct nfssvc_sock *slp));
static int nfssvc_iod __P((struct proc *));
#define TRUE 1
#define FALSE 0
static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON];
#ifndef NFS_NOSERVER
int nfsd_waiting = 0;
static struct nfsdrt nfsdrt;
static int nfs_numnfsd = 0;
static int notstarted = 1;
static int modify_flag = 0;
static void nfsd_rt __P((int sotype, struct nfsrv_descript *nd,
int cacherep));
static int nfssvc_addsock __P((struct file *, struct sockaddr *,
struct proc *));
static int nfssvc_nfsd __P((struct nfsd_srvargs *,caddr_t,struct proc *));
static int nfs_privport = 0;
SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, "");
SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, "");
SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, "");
/*
* NFS server system calls
* getfh() lives here too, but maybe should move to kern/vfs_syscalls.c
*/
/*
* Get file handle system call
*/
#ifndef _SYS_SYSPROTO_H_
struct getfh_args {
char *fname;
fhandle_t *fhp;
};
#endif
int
getfh(p, uap, retval)
struct proc *p;
register struct getfh_args *uap;
int *retval;
{
register struct vnode *vp;
fhandle_t fh;
int error;
struct nameidata nd;
/*
* Must be super user
*/
error = suser(p->p_ucred, &p->p_acflag);
if(error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->fname, p);
error = namei(&nd);
if (error)
return (error);
vp = nd.ni_vp;
bzero((caddr_t)&fh, sizeof(fh));
fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
error = VFS_VPTOFH(vp, &fh.fh_fid);
vput(vp);
if (error)
return (error);
error = copyout((caddr_t)&fh, (caddr_t)uap->fhp, sizeof (fh));
return (error);
}
#endif /* NFS_NOSERVER */
/*
* Nfs server psuedo system call for the nfsd's
* Based on the flag value it either:
* - adds a socket to the selection list
* - remains in the kernel as an nfsd
* - remains in the kernel as an nfsiod
*/
#ifndef _SYS_SYSPROTO_H_
struct nfssvc_args {
int flag;
caddr_t argp;
};
#endif
int
nfssvc(p, uap, retval)
struct proc *p;
register struct nfssvc_args *uap;
int *retval;
{
#ifndef NFS_NOSERVER
struct nameidata nd;
struct file *fp;
struct sockaddr *nam;
struct nfsd_args nfsdarg;
struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
struct nfsd_cargs ncd;
struct nfsd *nfsd;
struct nfssvc_sock *slp;
struct nfsuid *nuidp;
struct nfsmount *nmp;
#endif /* NFS_NOSERVER */
int error;
/*
* Must be super user
*/
error = suser(p->p_ucred, &p->p_acflag);
if(error)
return (error);
while (nfssvc_sockhead_flag & SLP_INIT) {
nfssvc_sockhead_flag |= SLP_WANTINIT;
(void) tsleep((caddr_t)&nfssvc_sockhead, PSOCK, "nfsd init", 0);
}
if (uap->flag & NFSSVC_BIOD)
error = nfssvc_iod(p);
#ifdef NFS_NOSERVER
else
error = ENXIO;
#else /* !NFS_NOSERVER */
else if (uap->flag & NFSSVC_MNTD) {
error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
ncd.ncd_dirp, p);
error = namei(&nd);
if (error)
return (error);
if ((nd.ni_vp->v_flag & VROOT) == 0)
error = EINVAL;
nmp = VFSTONFS(nd.ni_vp->v_mount);
vput(nd.ni_vp);
if (error)
return (error);
if ((nmp->nm_flag & NFSMNT_MNTD) &&
(uap->flag & NFSSVC_GOTAUTH) == 0)
return (0);
nmp->nm_flag |= NFSMNT_MNTD;
error = nqnfs_clientd(nmp, p->p_ucred, &ncd, uap->flag,
uap->argp, p);
} else if (uap->flag & NFSSVC_ADDSOCK) {
error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
if (error)
return (error);
error = getsock(p->p_fd, nfsdarg.sock, &fp);
if (error)
return (error);
/*
* Get the client address for connected sockets.
*/
if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
nam = (struct sockaddr *)0;
else {
error = getsockaddr(&nam, nfsdarg.name,
nfsdarg.namelen);
if (error)
return (error);
}
error = nfssvc_addsock(fp, nam, p);
} else {
error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
if (error)
return (error);
if ((uap->flag & NFSSVC_AUTHIN) && ((nfsd = nsd->nsd_nfsd)) &&
(nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
slp = nfsd->nfsd_slp;
/*
* First check to see if another nfsd has already
* added this credential.
*/
for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
(!nfsd->nfsd_nd->nd_nam2 ||
netaddr_match(NU_NETFAM(nuidp),
&nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
break;
}
if (nuidp) {
nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
} else {
/*
* Nope, so we will.
*/
if (slp->ns_numuids < nuidhash_max) {
slp->ns_numuids++;
nuidp = (struct nfsuid *)
malloc(sizeof (struct nfsuid), M_NFSUID,
M_WAITOK);
} else
nuidp = (struct nfsuid *)0;
if ((slp->ns_flag & SLP_VALID) == 0) {
if (nuidp)
free((caddr_t)nuidp, M_NFSUID);
} else {
if (nuidp == (struct nfsuid *)0) {
nuidp = slp->ns_uidlruhead.tqh_first;
LIST_REMOVE(nuidp, nu_hash);
TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
nu_lru);
if (nuidp->nu_flag & NU_NAM)
FREE(nuidp->nu_nam, M_SONAME);
}
nuidp->nu_flag = 0;
nuidp->nu_cr = nsd->nsd_cr;
if (nuidp->nu_cr.cr_ngroups > NGROUPS)
nuidp->nu_cr.cr_ngroups = NGROUPS;
nuidp->nu_cr.cr_ref = 1;
nuidp->nu_timestamp = nsd->nsd_timestamp;
nuidp->nu_expire = time.tv_sec + nsd->nsd_ttl;
/*
* and save the session key in nu_key.
*/
bcopy(nsd->nsd_key, nuidp->nu_key,
sizeof (nsd->nsd_key));
if (nfsd->nfsd_nd->nd_nam2) {
struct sockaddr_in *saddr;
saddr = (struct sockaddr_in *)
nfsd->nfsd_nd->nd_nam2;
switch (saddr->sin_family) {
case AF_INET:
nuidp->nu_flag |= NU_INETADDR;
nuidp->nu_inetaddr =
saddr->sin_addr.s_addr;
break;
case AF_ISO:
default:
nuidp->nu_flag |= NU_NAM;
nuidp->nu_nam =
dup_sockaddr(nfsd->nfsd_nd->
nd_nam2, 1);
break;
};
}
TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
nu_lru);
LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
nuidp, nu_hash);
nfsrv_setcred(&nuidp->nu_cr,
&nfsd->nfsd_nd->nd_cr);
nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
}
}
}
if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
nfsd->nfsd_flag |= NFSD_AUTHFAIL;
error = nfssvc_nfsd(nsd, uap->argp, p);
}
#endif /* NFS_NOSERVER */
if (error == EINTR || error == ERESTART)
error = 0;
return (error);
}
#ifndef NFS_NOSERVER
/*
* Adds a socket to the list for servicing by nfsds.
*/
static int
nfssvc_addsock(fp, mynam, p)
struct file *fp;
struct sockaddr *mynam;
struct proc *p;
{
register struct mbuf *m;
register int siz;
register struct nfssvc_sock *slp;
register struct socket *so;
struct nfssvc_sock *tslp;
int error, s;
so = (struct socket *)fp->f_data;
tslp = (struct nfssvc_sock *)0;
/*
* Add it to the list, as required.
*/
if (so->so_proto->pr_protocol == IPPROTO_UDP) {
tslp = nfs_udpsock;
if (tslp->ns_flag & SLP_VALID) {
FREE(mynam, M_SONAME);
return (EPERM);
}
#ifdef ISO
} else if (so->so_proto->pr_protocol == ISOPROTO_CLTP) {
tslp = nfs_cltpsock;
if (tslp->ns_flag & SLP_VALID) {
FREE(mynam, M_SONAME);
return (EPERM);
}
#endif /* ISO */
}
if (so->so_type == SOCK_STREAM)
siz = NFS_MAXPACKET + sizeof (u_long);
else
siz = NFS_MAXPACKET;
error = soreserve(so, siz, siz);
if (error) {
FREE(mynam, M_SONAME);
return (error);
}
/*
* Set protocol specific options { for now TCP only } and
* reserve some space. For datagram sockets, this can get called
* repeatedly for the same socket, but that isn't harmful.
*/
if (so->so_type == SOCK_STREAM) {
MGET(m, M_WAIT, MT_SOOPTS);
*mtod(m, int *) = 1;
m->m_len = sizeof(int);
sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m, p);
}
if (so->so_proto->pr_domain->dom_family == AF_INET &&
so->so_proto->pr_protocol == IPPROTO_TCP) {
MGET(m, M_WAIT, MT_SOOPTS);
*mtod(m, int *) = 1;
m->m_len = sizeof(int);
sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m, p);
}
so->so_rcv.sb_flags &= ~SB_NOINTR;
so->so_rcv.sb_timeo = 0;
so->so_snd.sb_flags &= ~SB_NOINTR;
so->so_snd.sb_timeo = 0;
if (tslp)
slp = tslp;
else {
slp = (struct nfssvc_sock *)
malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK);
bzero((caddr_t)slp, sizeof (struct nfssvc_sock));
STAILQ_INIT(&slp->ns_rec);
TAILQ_INIT(&slp->ns_uidlruhead);
TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
}
slp->ns_so = so;
slp->ns_nam = mynam;
fp->f_count++;
slp->ns_fp = fp;
s = splnet();
so->so_upcallarg = (caddr_t)slp;
so->so_upcall = nfsrv_rcv;
slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
nfsrv_wakenfsd(slp);
splx(s);
return (0);
}
/*
* Called by nfssvc() for nfsds. Just loops around servicing rpc requests
* until it is killed by a signal.
*/
static int
nfssvc_nfsd(nsd, argp, p)
struct nfsd_srvargs *nsd;
caddr_t argp;
struct proc *p;
{
register struct mbuf *m;
register int siz;
register struct nfssvc_sock *slp;
register struct socket *so;
register int *solockp;
struct nfsd *nfsd = nsd->nsd_nfsd;
struct nfsrv_descript *nd = NULL;
struct mbuf *mreq;
int error = 0, cacherep, s, sotype, writes_todo;
int procrastinate;
u_quad_t cur_usec;
#ifndef nolint
cacherep = RC_DOIT;
writes_todo = 0;
#endif
s = splnet();
if (nfsd == (struct nfsd *)0) {
nsd->nsd_nfsd = nfsd = (struct nfsd *)
malloc(sizeof (struct nfsd), M_NFSD, M_WAITOK);
bzero((caddr_t)nfsd, sizeof (struct nfsd));
nfsd->nfsd_procp = p;
TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
nfs_numnfsd++;
}
/*
* Loop getting rpc requests until SIGKILL.
*/
for (;;) {
if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
while (nfsd->nfsd_slp == (struct nfssvc_sock *)0 &&
(nfsd_head_flag & NFSD_CHECKSLP) == 0) {
nfsd->nfsd_flag |= NFSD_WAITING;
nfsd_waiting++;
error = tsleep((caddr_t)nfsd, PSOCK | PCATCH,
"nfsd", 0);
nfsd_waiting--;
if (error)
goto done;
}
if (nfsd->nfsd_slp == (struct nfssvc_sock *)0 &&
(nfsd_head_flag & NFSD_CHECKSLP) != 0) {
for (slp = nfssvc_sockhead.tqh_first; slp != 0;
slp = slp->ns_chain.tqe_next) {
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 == 0)
nfsd_head_flag &= ~NFSD_CHECKSLP;
}
if ((slp = nfsd->nfsd_slp) == (struct nfssvc_sock *)0)
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_sndlock(&slp->ns_solock,
(struct nfsreq *)0);
nfsrv_rcv(slp->ns_so, (caddr_t)slp,
M_WAIT);
nfs_sndunlock(&slp->ns_solock);
}
error = nfsrv_dorec(slp, nfsd, &nd);
cur_usec = (u_quad_t)time.tv_sec * 1000000 +
(u_quad_t)time.tv_usec;
if (error && slp->ns_tq.lh_first &&
slp->ns_tq.lh_first->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 = (struct nfssvc_sock *)0;
nfsd->nfsd_flag &= ~NFSD_REQINPROG;
nfsrv_slpderef(slp);
continue;
}
splx(s);
so = slp->ns_so;
sotype = so->so_type;
if (so->so_proto->pr_flags & PR_CONNREQUIRED)
solockp = &slp->ns_solock;
else
solockp = (int *)0;
if (nd) {
gettime(&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.
*/
if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
nsd->nsd_haddr =
((struct sockaddr_in *)
nd->nd_nam)->sin_addr.s_addr;
nsd->nsd_authlen = nfsd->nfsd_authlen;
nsd->nsd_verflen = nfsd->nfsd_verflen;
if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
nfsd->nfsd_authlen) &&
!copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
nfsd->nfsd_verflen) &&
!copyout((caddr_t)nsd, argp, sizeof (*nsd)))
return (ENEEDAUTH);
cacherep = RC_DROPIT;
} else
cacherep = nfsrv_getcache(nd, slp, &mreq);
/*
* Check for just starting up for NQNFS and send
* fake "try again later" replies to the NQNFS clients.
*/
if (notstarted && nqnfsstarttime <= time.tv_sec) {
if (modify_flag) {
nqnfsstarttime = time.tv_sec + nqsrv_writeslack;
modify_flag = 0;
} else
notstarted = 0;
}
if (notstarted) {
if ((nd->nd_flag & ND_NQNFS) == 0)
cacherep = RC_DROPIT;
else if (nd->nd_procnum != NFSPROC_WRITE) {
nd->nd_procnum = NFSPROC_NOOP;
nd->nd_repstat = NQNFS_TRYLATER;
cacherep = RC_DOIT;
} else
modify_flag = 1;
} else if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
nd->nd_procnum = NFSPROC_NOOP;
nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
cacherep = RC_DOIT;
} else if (nfs_privport) {
/* Check if source port is privileged */
u_short port;
u_long addr;
struct sockaddr *nam = nd->nd_nam;
struct sockaddr_in *sin;
sin = (struct sockaddr_in *)nam;
port = ntohs(sin->sin_port);
if (port >= IPPORT_RESERVED &&
nd->nd_procnum != NFSPROC_NULL) {
nd->nd_procnum = NFSPROC_NOOP;
nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
cacherep = RC_DOIT;
printf("NFS request from unprivileged port (%s:%d)\n",
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_procp, &mreq);
else
error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
slp, nfsd->nfsd_procp, &mreq);
if (mreq == NULL)
break;
if (error) {
if (nd->nd_procnum != NQNFSPROC_VACATED)
nfsstats.srv_errs++;
nfsrv_updatecache(nd, FALSE, mreq);
if (nd->nd_nam2)
FREE(nd->nd_nam2, M_SONAME);
break;
}
nfsstats.srvrpccnt[nd->nd_procnum]++;
nfsrv_updatecache(nd, TRUE, mreq);
nd->nd_mrep = (struct mbuf *)0;
case RC_REPLY:
m = mreq;
siz = 0;
while (m) {
siz += m->m_len;
m = m->m_next;
}
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 = (struct ifnet *)0;
/*
* For stream protocols, prepend a Sun RPC
* Record Mark.
*/
if (sotype == SOCK_STREAM) {
M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
*mtod(m, u_long *) = htonl(0x80000000 | siz);
}
if (solockp)
(void) nfs_sndlock(solockp, (struct nfsreq *)0);
if (slp->ns_flag & SLP_VALID)
error = nfs_send(so, nd->nd_nam2, m, NULL);
else {
error = EPIPE;
m_freem(m);
}
if (nfsrtton)
nfsd_rt(sotype, nd, cacherep);
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 (solockp)
nfs_sndunlock(solockp);
if (error == EINTR || error == ERESTART) {
free((caddr_t)nd, M_NFSRVDESC);
nfsrv_slpderef(slp);
s = splnet();
goto done;
}
break;
case RC_DROPIT:
if (nfsrtton)
nfsd_rt(sotype, nd, cacherep);
m_freem(nd->nd_mrep);
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 = (u_quad_t)time.tv_sec * 1000000 +
(u_quad_t)time.tv_usec;
s = splsoftclock();
if (slp->ns_tq.lh_first &&
slp->ns_tq.lh_first->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);
}
}
done:
TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
splx(s);
free((caddr_t)nfsd, M_NFSD);
nsd->nsd_nfsd = (struct nfsd *)0;
if (--nfs_numnfsd == 0)
nfsrv_init(TRUE); /* Reinitialize everything */
return (error);
}
#endif /* NFS_NOSERVER */
int nfs_defect = 0;
SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, "");
/*
* Asynchronous I/O daemons for client nfs.
* They do read-ahead and write-behind operations on the block I/O cache.
* Never returns unless it fails or gets killed.
*/
static int
nfssvc_iod(p)
struct proc *p;
{
register struct buf *bp, *nbp;
register int i, myiod;
struct vnode *vp;
struct nfsmount *nmp;
int error = 0, s;
/*
* Assign my position or return error if too many already running
*/
myiod = -1;
for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
if (nfs_asyncdaemon[i] == 0) {
nfs_asyncdaemon[i]++;
myiod = i;
break;
}
if (myiod == -1)
return (EBUSY);
nfs_numasync++;
/*
* Just loop around doin our stuff until SIGKILL
*/
for (;;) {
while (((nmp = nfs_iodmount[myiod]) == NULL
|| nmp->nm_bufq.tqh_first == NULL)
&& error == 0) {
if (nmp)
nmp->nm_bufqiods--;
nfs_iodwant[myiod] = p;
nfs_iodmount[myiod] = NULL;
error = tsleep((caddr_t)&nfs_iodwant[myiod],
PWAIT | PCATCH, "nfsidl", 0);
}
if (error) {
nfs_asyncdaemon[myiod] = 0;
if (nmp) nmp->nm_bufqiods--;
nfs_iodwant[myiod] = NULL;
nfs_iodmount[myiod] = NULL;
nfs_numasync--;
return (error);
}
while ((bp = nmp->nm_bufq.tqh_first) != NULL) {
/* Take one off the front of the list */
TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist);
nmp->nm_bufqlen--;
if (nmp->nm_bufqwant && nmp->nm_bufqlen < 2 * nfs_numasync) {
nmp->nm_bufqwant = FALSE;
wakeup(&nmp->nm_bufq);
}
if (bp->b_flags & B_READ)
(void) nfs_doio(bp, bp->b_rcred, (struct proc *)0);
else
(void) nfs_doio(bp, bp->b_wcred, (struct proc *)0);
/*
* If there are more than one iod on this mount, then defect
* so that the iods can be shared out fairly between the mounts
*/
if (nfs_defect && nmp->nm_bufqiods > 1) {
NFS_DPF(ASYNCIO,
("nfssvc_iod: iod %d defecting from mount %p\n",
myiod, nmp));
nfs_iodmount[myiod] = NULL;
nmp->nm_bufqiods--;
break;
}
}
}
}
/*
* 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(slp)
register struct nfssvc_sock *slp;
{
register struct nfsuid *nuidp, *nnuidp;
register struct nfsrv_descript *nwp, *nnwp;
struct socket *so;
struct file *fp;
struct mbuf *m;
struct nfsrv_rec *rec;
int s;
slp->ns_flag &= ~SLP_ALLFLAGS;
fp = slp->ns_fp;
if (fp) {
slp->ns_fp = (struct file *)0;
so = slp->ns_so;
so->so_upcall = NULL;
soshutdown(so, 2);
closef(fp, (struct proc *)0);
if (slp->ns_nam)
FREE(slp->ns_nam, M_SONAME);
m_freem(slp->ns_raw);
while (rec = STAILQ_FIRST(&slp->ns_rec)) {
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);
}
for (nuidp = slp->ns_uidlruhead.tqh_first; nuidp != 0;
nuidp = nnuidp) {
nnuidp = nuidp->nu_lru.tqe_next;
LIST_REMOVE(nuidp, nu_hash);
TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
if (nuidp->nu_flag & NU_NAM)
FREE(nuidp->nu_nam, M_SONAME);
free((caddr_t)nuidp, M_NFSUID);
}
s = splsoftclock();
for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
nnwp = nwp->nd_tq.le_next;
LIST_REMOVE(nwp, nd_tq);
free((caddr_t)nwp, M_NFSRVDESC);
}
LIST_INIT(&slp->ns_tq);
splx(s);
}
}
/*
* Get an authorization string for the uid by having the mount_nfs sitting
* on this mount point porpous out of the kernel and do it.
*/
int
nfs_getauth(nmp, rep, cred, auth_str, auth_len, verf_str, verf_len, key)
register struct nfsmount *nmp;
struct nfsreq *rep;
struct ucred *cred;
char **auth_str;
int *auth_len;
char *verf_str;
int *verf_len;
NFSKERBKEY_T key; /* return session key */
{
int error = 0;
while ((nmp->nm_flag & NFSMNT_WAITAUTH) == 0) {
nmp->nm_flag |= NFSMNT_WANTAUTH;
(void) tsleep((caddr_t)&nmp->nm_authtype, PSOCK,
"nfsauth1", 2 * hz);
error = nfs_sigintr(nmp, rep, rep->r_procp);
if (error) {
nmp->nm_flag &= ~NFSMNT_WANTAUTH;
return (error);
}
}
nmp->nm_flag &= ~(NFSMNT_WAITAUTH | NFSMNT_WANTAUTH);
nmp->nm_authstr = *auth_str = (char *)malloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
nmp->nm_authlen = RPCAUTH_MAXSIZ;
nmp->nm_verfstr = verf_str;
nmp->nm_verflen = *verf_len;
nmp->nm_authuid = cred->cr_uid;
wakeup((caddr_t)&nmp->nm_authstr);
/*
* And wait for mount_nfs to do its stuff.
*/
while ((nmp->nm_flag & NFSMNT_HASAUTH) == 0 && error == 0) {
(void) tsleep((caddr_t)&nmp->nm_authlen, PSOCK,
"nfsauth2", 2 * hz);
error = nfs_sigintr(nmp, rep, rep->r_procp);
}
if (nmp->nm_flag & NFSMNT_AUTHERR) {
nmp->nm_flag &= ~NFSMNT_AUTHERR;
error = EAUTH;
}
if (error)
free((caddr_t)*auth_str, M_TEMP);
else {
*auth_len = nmp->nm_authlen;
*verf_len = nmp->nm_verflen;
bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key));
}
nmp->nm_flag &= ~NFSMNT_HASAUTH;
nmp->nm_flag |= NFSMNT_WAITAUTH;
if (nmp->nm_flag & NFSMNT_WANTAUTH) {
nmp->nm_flag &= ~NFSMNT_WANTAUTH;
wakeup((caddr_t)&nmp->nm_authtype);
}
return (error);
}
/*
* Get a nickname authenticator and verifier.
*/
int
nfs_getnickauth(nmp, cred, auth_str, auth_len, verf_str, verf_len)
struct nfsmount *nmp;
struct ucred *cred;
char **auth_str;
int *auth_len;
char *verf_str;
int verf_len;
{
register struct nfsuid *nuidp;
register u_long *nickp, *verfp;
struct timeval ktvin, ktvout;
#ifdef DIAGNOSTIC
if (verf_len < (4 * NFSX_UNSIGNED))
panic("nfs_getnickauth verf too small");
#endif
for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
if (nuidp->nu_cr.cr_uid == cred->cr_uid)
break;
}
if (!nuidp || nuidp->nu_expire < time.tv_sec)
return (EACCES);
/*
* Move to the end of the lru list (end of lru == most recently used).
*/
TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
nickp = (u_long *)malloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
*nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
*nickp = txdr_unsigned(nuidp->nu_nickname);
*auth_str = (char *)nickp;
*auth_len = 2 * NFSX_UNSIGNED;
/*
* Now we must encrypt the verifier and package it up.
*/
verfp = (u_long *)verf_str;
*verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
if (time.tv_sec > nuidp->nu_timestamp.tv_sec ||
(time.tv_sec == nuidp->nu_timestamp.tv_sec &&
time.tv_usec > nuidp->nu_timestamp.tv_usec))
gettime(&nuidp->nu_timestamp);
else
nuidp->nu_timestamp.tv_usec++;
ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
/*
* Now encrypt the timestamp verifier in ecb mode using the session
* key.
*/
#ifdef NFSKERB
XXX
#endif
*verfp++ = ktvout.tv_sec;
*verfp++ = ktvout.tv_usec;
*verfp = 0;
return (0);
}
/*
* Save the current nickname in a hash list entry on the mount point.
*/
int
nfs_savenickauth(nmp, cred, len, key, mdp, dposp, mrep)
register struct nfsmount *nmp;
struct ucred *cred;
int len;
NFSKERBKEY_T key;
struct mbuf **mdp;
char **dposp;
struct mbuf *mrep;
{
register struct nfsuid *nuidp;
register u_long *tl;
register long t1;
struct mbuf *md = *mdp;
struct timeval ktvin, ktvout;
u_long nick;
char *dpos = *dposp, *cp2;
int deltasec, error = 0;
if (len == (3 * NFSX_UNSIGNED)) {
nfsm_dissect(tl, u_long *, 3 * NFSX_UNSIGNED);
ktvin.tv_sec = *tl++;
ktvin.tv_usec = *tl++;
nick = fxdr_unsigned(u_long, *tl);
/*
* Decrypt the timestamp in ecb mode.
*/
#ifdef NFSKERB
XXX
#endif
ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
deltasec = time.tv_sec - ktvout.tv_sec;
if (deltasec < 0)
deltasec = -deltasec;
/*
* If ok, add it to the hash list for the mount point.
*/
if (deltasec <= NFS_KERBCLOCKSKEW) {
if (nmp->nm_numuids < nuidhash_max) {
nmp->nm_numuids++;
nuidp = (struct nfsuid *)
malloc(sizeof (struct nfsuid), M_NFSUID,
M_WAITOK);
} else {
nuidp = nmp->nm_uidlruhead.tqh_first;
LIST_REMOVE(nuidp, nu_hash);
TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
nu_lru);
}
nuidp->nu_flag = 0;
nuidp->nu_cr.cr_uid = cred->cr_uid;
nuidp->nu_expire = time.tv_sec + NFS_KERBTTL;
nuidp->nu_timestamp = ktvout;
nuidp->nu_nickname = nick;
bcopy(key, nuidp->nu_key, sizeof (key));
TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
nu_lru);
LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
nuidp, nu_hash);
}
} else
nfsm_adv(nfsm_rndup(len));
nfsmout:
*mdp = md;
*dposp = dpos;
return (error);
}
#ifndef NFS_NOSERVER
/*
* Derefence a server socket structure. If it has no more references and
* is no longer valid, you can throw it away.
*/
void
nfsrv_slpderef(slp)
register struct nfssvc_sock *slp;
{
if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
free((caddr_t)slp, M_NFSSVC);
}
}
/*
* Initialize the data structures for the server.
* Handshake with any new nfsds starting up to avoid any chance of
* corruption.
*/
void
nfsrv_init(terminating)
int terminating;
{
register struct nfssvc_sock *slp, *nslp;
if (nfssvc_sockhead_flag & SLP_INIT)
panic("nfsd init");
nfssvc_sockhead_flag |= SLP_INIT;
if (terminating) {
for (slp = nfssvc_sockhead.tqh_first; slp != 0; slp = nslp) {
nslp = slp->ns_chain.tqe_next;
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((caddr_t)&nfssvc_sockhead);
}
TAILQ_INIT(&nfsd_head);
nfsd_head_flag &= ~NFSD_CHECKSLP;
nfs_udpsock = (struct nfssvc_sock *)
malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK);
bzero((caddr_t)nfs_udpsock, sizeof (struct nfssvc_sock));
STAILQ_INIT(&nfs_udpsock->ns_rec);
TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
nfs_cltpsock = (struct nfssvc_sock *)
malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK);
bzero((caddr_t)nfs_cltpsock, sizeof (struct nfssvc_sock));
STAILQ_INIT(&nfs_cltpsock->ns_rec);
TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
}
/*
* Add entries to the server monitor log.
*/
static void
nfsd_rt(sotype, nd, cacherep)
int sotype;
register struct nfsrv_descript *nd;
int cacherep;
{
register struct drt *rt;
rt = &nfsdrt.drt[nfsdrt.pos];
if (cacherep == RC_DOIT)
rt->flag = 0;
else if (cacherep == RC_REPLY)
rt->flag = DRT_CACHEREPLY;
else
rt->flag = DRT_CACHEDROP;
if (sotype == SOCK_STREAM)
rt->flag |= DRT_TCP;
if (nd->nd_flag & ND_NQNFS)
rt->flag |= DRT_NQNFS;
else if (nd->nd_flag & ND_NFSV3)
rt->flag |= DRT_NFSV3;
rt->proc = nd->nd_procnum;
if (nd->nd_nam->sa_family == AF_INET)
rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
else
rt->ipadr = INADDR_ANY;
rt->resptime = ((time.tv_sec - nd->nd_starttime.tv_sec) * 1000000) +
(time.tv_usec - nd->nd_starttime.tv_usec);
gettime(&rt->tstamp);
nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
}
#endif /* NFS_NOSERVER */
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