4.4BSD/usr/src/sys/nfs/nfs_socket.c
/*
* Copyright (c) 1989, 1991, 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_socket.c 8.1 (Berkeley) 6/16/93
*/
/*
* Socket operations for use by nfs
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/vnode.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#include <sys/tprintf.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsv2.h>
#include <nfs/nfs.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsmount.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsrtt.h>
#include <nfs/nqnfs.h>
#define TRUE 1
#define FALSE 0
/*
* Estimate rto for an nfs rpc sent via. an unreliable datagram.
* Use the mean and mean deviation of rtt for the appropriate type of rpc
* for the frequent rpcs and a default for the others.
* The justification for doing "other" this way is that these rpcs
* happen so infrequently that timer est. would probably be stale.
* Also, since many of these rpcs are
* non-idempotent, a conservative timeout is desired.
* getattr, lookup - A+2D
* read, write - A+4D
* other - nm_timeo
*/
#define NFS_RTO(n, t) \
((t) == 0 ? (n)->nm_timeo : \
((t) < 3 ? \
(((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
#define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
#define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
/*
* External data, mostly RPC constants in XDR form
*/
extern u_long rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, rpc_auth_unix,
rpc_msgaccepted, rpc_call, rpc_autherr, rpc_rejectedcred,
rpc_auth_kerb;
extern u_long nfs_prog, nfs_vers, nqnfs_prog, nqnfs_vers;
extern time_t nqnfsstarttime;
extern int nonidempotent[NFS_NPROCS];
/*
* Maps errno values to nfs error numbers.
* Use NFSERR_IO as the catch all for ones not specifically defined in
* RFC 1094.
*/
static int nfsrv_errmap[ELAST] = {
NFSERR_PERM, NFSERR_NOENT, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_NXIO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_ACCES, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_EXIST, NFSERR_IO, NFSERR_NODEV, NFSERR_NOTDIR,
NFSERR_ISDIR, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_FBIG, NFSERR_NOSPC, NFSERR_IO, NFSERR_ROFS,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_NAMETOL, NFSERR_IO, NFSERR_IO,
NFSERR_NOTEMPTY, NFSERR_IO, NFSERR_IO, NFSERR_DQUOT, NFSERR_STALE,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO,
};
/*
* Defines which timer to use for the procnum.
* 0 - default
* 1 - getattr
* 2 - lookup
* 3 - read
* 4 - write
*/
static int proct[NFS_NPROCS] = {
0, 1, 0, 0, 2, 3, 3, 0, 4, 0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 0, 0, 0, 0,
};
/*
* There is a congestion window for outstanding rpcs maintained per mount
* point. The cwnd size is adjusted in roughly the way that:
* Van Jacobson, Congestion avoidance and Control, In "Proceedings of
* SIGCOMM '88". ACM, August 1988.
* describes for TCP. The cwnd size is chopped in half on a retransmit timeout
* and incremented by 1/cwnd when each rpc reply is received and a full cwnd
* of rpcs is in progress.
* (The sent count and cwnd are scaled for integer arith.)
* Variants of "slow start" were tried and were found to be too much of a
* performance hit (ave. rtt 3 times larger),
* I suspect due to the large rtt that nfs rpcs have.
*/
#define NFS_CWNDSCALE 256
#define NFS_MAXCWND (NFS_CWNDSCALE * 32)
static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
int nfs_sbwait();
void nfs_disconnect(), nfs_realign(), nfsrv_wakenfsd(), nfs_sndunlock();
void nfs_rcvunlock(), nqnfs_serverd(), nqnfs_clientlease();
struct mbuf *nfsm_rpchead();
int nfsrtton = 0;
struct nfsrtt nfsrtt;
struct nfsd nfsd_head;
int nfsrv_null(),
nfsrv_getattr(),
nfsrv_setattr(),
nfsrv_lookup(),
nfsrv_readlink(),
nfsrv_read(),
nfsrv_write(),
nfsrv_create(),
nfsrv_remove(),
nfsrv_rename(),
nfsrv_link(),
nfsrv_symlink(),
nfsrv_mkdir(),
nfsrv_rmdir(),
nfsrv_readdir(),
nfsrv_statfs(),
nfsrv_noop(),
nqnfsrv_readdirlook(),
nqnfsrv_getlease(),
nqnfsrv_vacated(),
nqnfsrv_access();
int (*nfsrv_procs[NFS_NPROCS])() = {
nfsrv_null,
nfsrv_getattr,
nfsrv_setattr,
nfsrv_noop,
nfsrv_lookup,
nfsrv_readlink,
nfsrv_read,
nfsrv_noop,
nfsrv_write,
nfsrv_create,
nfsrv_remove,
nfsrv_rename,
nfsrv_link,
nfsrv_symlink,
nfsrv_mkdir,
nfsrv_rmdir,
nfsrv_readdir,
nfsrv_statfs,
nqnfsrv_readdirlook,
nqnfsrv_getlease,
nqnfsrv_vacated,
nfsrv_noop,
nqnfsrv_access,
};
struct nfsreq nfsreqh;
/*
* Initialize sockets and congestion for a new NFS connection.
* We do not free the sockaddr if error.
*/
nfs_connect(nmp, rep)
register struct nfsmount *nmp;
struct nfsreq *rep;
{
register struct socket *so;
int s, error, rcvreserve, sndreserve;
struct sockaddr *saddr;
struct sockaddr_in *sin;
struct mbuf *m;
u_short tport;
nmp->nm_so = (struct socket *)0;
saddr = mtod(nmp->nm_nam, struct sockaddr *);
if (error = socreate(saddr->sa_family,
&nmp->nm_so, nmp->nm_sotype, nmp->nm_soproto))
goto bad;
so = nmp->nm_so;
nmp->nm_soflags = so->so_proto->pr_flags;
/*
* Some servers require that the client port be a reserved port number.
*/
if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
MGET(m, M_WAIT, MT_SONAME);
sin = mtod(m, struct sockaddr_in *);
sin->sin_len = m->m_len = sizeof (struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_ANY;
tport = IPPORT_RESERVED - 1;
sin->sin_port = htons(tport);
while ((error = sobind(so, m)) == EADDRINUSE &&
--tport > IPPORT_RESERVED / 2)
sin->sin_port = htons(tport);
m_freem(m);
if (error)
goto bad;
}
/*
* Protocols that do not require connections may be optionally left
* unconnected for servers that reply from a port other than NFS_PORT.
*/
if (nmp->nm_flag & NFSMNT_NOCONN) {
if (nmp->nm_soflags & PR_CONNREQUIRED) {
error = ENOTCONN;
goto bad;
}
} else {
if (error = soconnect(so, nmp->nm_nam))
goto bad;
/*
* Wait for the connection to complete. Cribbed from the
* connect system call but with the wait timing out so
* that interruptible mounts don't hang here for a long time.
*/
s = splnet();
while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
(void) tsleep((caddr_t)&so->so_timeo, PSOCK,
"nfscon", 2 * hz);
if ((so->so_state & SS_ISCONNECTING) &&
so->so_error == 0 && rep &&
(error = nfs_sigintr(nmp, rep, rep->r_procp))) {
so->so_state &= ~SS_ISCONNECTING;
splx(s);
goto bad;
}
}
if (so->so_error) {
error = so->so_error;
so->so_error = 0;
splx(s);
goto bad;
}
splx(s);
}
if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) {
so->so_rcv.sb_timeo = (5 * hz);
so->so_snd.sb_timeo = (5 * hz);
} else {
so->so_rcv.sb_timeo = 0;
so->so_snd.sb_timeo = 0;
}
if (nmp->nm_sotype == SOCK_DGRAM) {
sndreserve = nmp->nm_wsize + NFS_MAXPKTHDR;
rcvreserve = nmp->nm_rsize + NFS_MAXPKTHDR;
} else if (nmp->nm_sotype == SOCK_SEQPACKET) {
sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2;
rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR) * 2;
} else {
if (nmp->nm_sotype != SOCK_STREAM)
panic("nfscon sotype");
if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
MGET(m, M_WAIT, MT_SOOPTS);
*mtod(m, int *) = 1;
m->m_len = sizeof(int);
sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m);
}
if (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);
}
sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + sizeof (u_long))
* 2;
rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + sizeof (u_long))
* 2;
}
if (error = soreserve(so, sndreserve, rcvreserve))
goto bad;
so->so_rcv.sb_flags |= SB_NOINTR;
so->so_snd.sb_flags |= SB_NOINTR;
/* Initialize other non-zero congestion variables */
nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] =
nmp->nm_srtt[4] = (NFS_TIMEO << 3);
nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
nmp->nm_sdrtt[3] = nmp->nm_sdrtt[4] = 0;
nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */
nmp->nm_sent = 0;
nmp->nm_timeouts = 0;
return (0);
bad:
nfs_disconnect(nmp);
return (error);
}
/*
* Reconnect routine:
* Called when a connection is broken on a reliable protocol.
* - clean up the old socket
* - nfs_connect() again
* - set R_MUSTRESEND for all outstanding requests on mount point
* If this fails the mount point is DEAD!
* nb: Must be called with the nfs_sndlock() set on the mount point.
*/
nfs_reconnect(rep)
register struct nfsreq *rep;
{
register struct nfsreq *rp;
register struct nfsmount *nmp = rep->r_nmp;
int error;
nfs_disconnect(nmp);
while (error = nfs_connect(nmp, rep)) {
if (error == EINTR || error == ERESTART)
return (EINTR);
(void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0);
}
/*
* Loop through outstanding request list and fix up all requests
* on old socket.
*/
rp = nfsreqh.r_next;
while (rp != &nfsreqh) {
if (rp->r_nmp == nmp)
rp->r_flags |= R_MUSTRESEND;
rp = rp->r_next;
}
return (0);
}
/*
* NFS disconnect. Clean up and unlink.
*/
void
nfs_disconnect(nmp)
register struct nfsmount *nmp;
{
register struct socket *so;
if (nmp->nm_so) {
so = nmp->nm_so;
nmp->nm_so = (struct socket *)0;
soshutdown(so, 2);
soclose(so);
}
}
/*
* This is the nfs send routine. For connection based socket types, it
* must be called with an nfs_sndlock() on the socket.
* "rep == NULL" indicates that it has been called from a server.
* For the client side:
* - return EINTR if the RPC is terminated, 0 otherwise
* - set R_MUSTRESEND if the send fails for any reason
* - do any cleanup required by recoverable socket errors (???)
* For the server side:
* - return EINTR or ERESTART if interrupted by a signal
* - return EPIPE if a connection is lost for connection based sockets (TCP...)
* - do any cleanup required by recoverable socket errors (???)
*/
nfs_send(so, nam, top, rep)
register struct socket *so;
struct mbuf *nam;
register struct mbuf *top;
struct nfsreq *rep;
{
struct mbuf *sendnam;
int error, soflags, flags;
if (rep) {
if (rep->r_flags & R_SOFTTERM) {
m_freem(top);
return (EINTR);
}
if ((so = rep->r_nmp->nm_so) == NULL) {
rep->r_flags |= R_MUSTRESEND;
m_freem(top);
return (0);
}
rep->r_flags &= ~R_MUSTRESEND;
soflags = rep->r_nmp->nm_soflags;
} else
soflags = so->so_proto->pr_flags;
if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
sendnam = (struct mbuf *)0;
else
sendnam = nam;
if (so->so_type == SOCK_SEQPACKET)
flags = MSG_EOR;
else
flags = 0;
error = sosend(so, sendnam, (struct uio *)0, top,
(struct mbuf *)0, flags);
if (error) {
if (rep) {
log(LOG_INFO, "nfs send error %d for server %s\n",error,
rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
/*
* Deal with errors for the client side.
*/
if (rep->r_flags & R_SOFTTERM)
error = EINTR;
else
rep->r_flags |= R_MUSTRESEND;
} else
log(LOG_INFO, "nfsd send error %d\n", error);
/*
* Handle any recoverable (soft) socket errors here. (???)
*/
if (error != EINTR && error != ERESTART &&
error != EWOULDBLOCK && error != EPIPE)
error = 0;
}
return (error);
}
/*
* Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
* done by soreceive(), but for SOCK_STREAM we must deal with the Record
* Mark and consolidate the data into a new mbuf list.
* nb: Sometimes TCP passes the data up to soreceive() in long lists of
* small mbufs.
* For SOCK_STREAM we must be very careful to read an entire record once
* we have read any of it, even if the system call has been interrupted.
*/
nfs_receive(rep, aname, mp)
register struct nfsreq *rep;
struct mbuf **aname;
struct mbuf **mp;
{
register struct socket *so;
struct uio auio;
struct iovec aio;
register struct mbuf *m;
struct mbuf *control;
u_long len;
struct mbuf **getnam;
int error, sotype, rcvflg;
struct proc *p = curproc; /* XXX */
/*
* Set up arguments for soreceive()
*/
*mp = (struct mbuf *)0;
*aname = (struct mbuf *)0;
sotype = rep->r_nmp->nm_sotype;
/*
* For reliable protocols, lock against other senders/receivers
* in case a reconnect is necessary.
* For SOCK_STREAM, first get the Record Mark to find out how much
* more there is to get.
* We must lock the socket against other receivers
* until we have an entire rpc request/reply.
*/
if (sotype != SOCK_DGRAM) {
if (error = nfs_sndlock(&rep->r_nmp->nm_flag, rep))
return (error);
tryagain:
/*
* Check for fatal errors and resending request.
*/
/*
* Ugh: If a reconnect attempt just happened, nm_so
* would have changed. NULL indicates a failed
* attempt that has essentially shut down this
* mount point.
*/
if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
nfs_sndunlock(&rep->r_nmp->nm_flag);
return (EINTR);
}
if ((so = rep->r_nmp->nm_so) == NULL) {
if (error = nfs_reconnect(rep)) {
nfs_sndunlock(&rep->r_nmp->nm_flag);
return (error);
}
goto tryagain;
}
while (rep->r_flags & R_MUSTRESEND) {
m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
nfsstats.rpcretries++;
if (error = nfs_send(so, rep->r_nmp->nm_nam, m, rep)) {
if (error == EINTR || error == ERESTART ||
(error = nfs_reconnect(rep))) {
nfs_sndunlock(&rep->r_nmp->nm_flag);
return (error);
}
goto tryagain;
}
}
nfs_sndunlock(&rep->r_nmp->nm_flag);
if (sotype == SOCK_STREAM) {
aio.iov_base = (caddr_t) &len;
aio.iov_len = sizeof(u_long);
auio.uio_iov = &aio;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_offset = 0;
auio.uio_resid = sizeof(u_long);
auio.uio_procp = p;
do {
rcvflg = MSG_WAITALL;
error = soreceive(so, (struct mbuf **)0, &auio,
(struct mbuf **)0, (struct mbuf **)0, &rcvflg);
if (error == EWOULDBLOCK && rep) {
if (rep->r_flags & R_SOFTTERM)
return (EINTR);
}
} while (error == EWOULDBLOCK);
if (!error && auio.uio_resid > 0) {
log(LOG_INFO,
"short receive (%d/%d) from nfs server %s\n",
sizeof(u_long) - auio.uio_resid,
sizeof(u_long),
rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
error = EPIPE;
}
if (error)
goto errout;
len = ntohl(len) & ~0x80000000;
/*
* This is SERIOUS! We are out of sync with the sender
* and forcing a disconnect/reconnect is all I can do.
*/
if (len > NFS_MAXPACKET) {
log(LOG_ERR, "%s (%d) from nfs server %s\n",
"impossible packet length",
len,
rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
error = EFBIG;
goto errout;
}
auio.uio_resid = len;
do {
rcvflg = MSG_WAITALL;
error = soreceive(so, (struct mbuf **)0,
&auio, mp, (struct mbuf **)0, &rcvflg);
} while (error == EWOULDBLOCK || error == EINTR ||
error == ERESTART);
if (!error && auio.uio_resid > 0) {
log(LOG_INFO,
"short receive (%d/%d) from nfs server %s\n",
len - auio.uio_resid, len,
rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
error = EPIPE;
}
} else {
/*
* NB: Since uio_resid is big, MSG_WAITALL is ignored
* and soreceive() will return when it has either a
* control msg or a data msg.
* We have no use for control msg., but must grab them
* and then throw them away so we know what is going
* on.
*/
auio.uio_resid = len = 100000000; /* Anything Big */
auio.uio_procp = p;
do {
rcvflg = 0;
error = soreceive(so, (struct mbuf **)0,
&auio, mp, &control, &rcvflg);
if (control)
m_freem(control);
if (error == EWOULDBLOCK && rep) {
if (rep->r_flags & R_SOFTTERM)
return (EINTR);
}
} while (error == EWOULDBLOCK ||
(!error && *mp == NULL && control));
if ((rcvflg & MSG_EOR) == 0)
printf("Egad!!\n");
if (!error && *mp == NULL)
error = EPIPE;
len -= auio.uio_resid;
}
errout:
if (error && error != EINTR && error != ERESTART) {
m_freem(*mp);
*mp = (struct mbuf *)0;
if (error != EPIPE)
log(LOG_INFO,
"receive error %d from nfs server %s\n",
error,
rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
error = nfs_sndlock(&rep->r_nmp->nm_flag, rep);
if (!error)
error = nfs_reconnect(rep);
if (!error)
goto tryagain;
}
} else {
if ((so = rep->r_nmp->nm_so) == NULL)
return (EACCES);
if (so->so_state & SS_ISCONNECTED)
getnam = (struct mbuf **)0;
else
getnam = aname;
auio.uio_resid = len = 1000000;
auio.uio_procp = p;
do {
rcvflg = 0;
error = soreceive(so, getnam, &auio, mp,
(struct mbuf **)0, &rcvflg);
if (error == EWOULDBLOCK &&
(rep->r_flags & R_SOFTTERM))
return (EINTR);
} while (error == EWOULDBLOCK);
len -= auio.uio_resid;
}
if (error) {
m_freem(*mp);
*mp = (struct mbuf *)0;
}
/*
* Search for any mbufs that are not a multiple of 4 bytes long
* or with m_data not longword aligned.
* These could cause pointer alignment problems, so copy them to
* well aligned mbufs.
*/
nfs_realign(*mp, 5 * NFSX_UNSIGNED);
return (error);
}
/*
* Implement receipt of reply on a socket.
* We must search through the list of received datagrams matching them
* with outstanding requests using the xid, until ours is found.
*/
/* ARGSUSED */
nfs_reply(myrep)
struct nfsreq *myrep;
{
register struct nfsreq *rep;
register struct nfsmount *nmp = myrep->r_nmp;
register long t1;
struct mbuf *mrep, *nam, *md;
u_long rxid, *tl;
caddr_t dpos, cp2;
int error;
/*
* Loop around until we get our own reply
*/
for (;;) {
/*
* Lock against other receivers so that I don't get stuck in
* sbwait() after someone else has received my reply for me.
* Also necessary for connection based protocols to avoid
* race conditions during a reconnect.
*/
if (error = nfs_rcvlock(myrep))
return (error);
/* Already received, bye bye */
if (myrep->r_mrep != NULL) {
nfs_rcvunlock(&nmp->nm_flag);
return (0);
}
/*
* Get the next Rpc reply off the socket
*/
error = nfs_receive(myrep, &nam, &mrep);
nfs_rcvunlock(&nmp->nm_flag);
if (error) {
/*
* Ignore routing errors on connectionless protocols??
*/
if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
nmp->nm_so->so_error = 0;
if (myrep->r_flags & R_GETONEREP)
return (0);
continue;
}
return (error);
}
if (nam)
m_freem(nam);
/*
* Get the xid and check that it is an rpc reply
*/
md = mrep;
dpos = mtod(md, caddr_t);
nfsm_dissect(tl, u_long *, 2*NFSX_UNSIGNED);
rxid = *tl++;
if (*tl != rpc_reply) {
if (nmp->nm_flag & NFSMNT_NQNFS) {
if (nqnfs_callback(nmp, mrep, md, dpos))
nfsstats.rpcinvalid++;
} else {
nfsstats.rpcinvalid++;
m_freem(mrep);
}
nfsmout:
if (myrep->r_flags & R_GETONEREP)
return (0);
continue;
}
/*
* Loop through the request list to match up the reply
* Iff no match, just drop the datagram
*/
rep = nfsreqh.r_next;
while (rep != &nfsreqh) {
if (rep->r_mrep == NULL && rxid == rep->r_xid) {
/* Found it.. */
rep->r_mrep = mrep;
rep->r_md = md;
rep->r_dpos = dpos;
if (nfsrtton) {
struct rttl *rt;
rt = &nfsrtt.rttl[nfsrtt.pos];
rt->proc = rep->r_procnum;
rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]);
rt->sent = nmp->nm_sent;
rt->cwnd = nmp->nm_cwnd;
rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
rt->tstamp = time;
if (rep->r_flags & R_TIMING)
rt->rtt = rep->r_rtt;
else
rt->rtt = 1000000;
nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
}
/*
* Update congestion window.
* Do the additive increase of
* one rpc/rtt.
*/
if (nmp->nm_cwnd <= nmp->nm_sent) {
nmp->nm_cwnd +=
(NFS_CWNDSCALE * NFS_CWNDSCALE +
(nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
if (nmp->nm_cwnd > NFS_MAXCWND)
nmp->nm_cwnd = NFS_MAXCWND;
}
rep->r_flags &= ~R_SENT;
nmp->nm_sent -= NFS_CWNDSCALE;
/*
* Update rtt using a gain of 0.125 on the mean
* and a gain of 0.25 on the deviation.
*/
if (rep->r_flags & R_TIMING) {
/*
* Since the timer resolution of
* NFS_HZ is so course, it can often
* result in r_rtt == 0. Since
* r_rtt == N means that the actual
* rtt is between N+dt and N+2-dt ticks,
* add 1.
*/
t1 = rep->r_rtt + 1;
t1 -= (NFS_SRTT(rep) >> 3);
NFS_SRTT(rep) += t1;
if (t1 < 0)
t1 = -t1;
t1 -= (NFS_SDRTT(rep) >> 2);
NFS_SDRTT(rep) += t1;
}
nmp->nm_timeouts = 0;
break;
}
rep = rep->r_next;
}
/*
* If not matched to a request, drop it.
* If it's mine, get out.
*/
if (rep == &nfsreqh) {
nfsstats.rpcunexpected++;
m_freem(mrep);
} else if (rep == myrep) {
if (rep->r_mrep == NULL)
panic("nfsreply nil");
return (0);
}
if (myrep->r_flags & R_GETONEREP)
return (0);
}
}
/*
* nfs_request - goes something like this
* - fill in request struct
* - links it into list
* - calls nfs_send() for first transmit
* - calls nfs_receive() to get reply
* - break down rpc header and return with nfs reply pointed to
* by mrep or error
* nb: always frees up mreq mbuf list
*/
nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp)
struct vnode *vp;
struct mbuf *mrest;
int procnum;
struct proc *procp;
struct ucred *cred;
struct mbuf **mrp;
struct mbuf **mdp;
caddr_t *dposp;
{
register struct mbuf *m, *mrep;
register struct nfsreq *rep;
register u_long *tl;
register int i;
struct nfsmount *nmp;
struct mbuf *md, *mheadend;
struct nfsreq *reph;
struct nfsnode *tp, *np;
time_t reqtime, waituntil;
caddr_t dpos, cp2;
int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type;
int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0;
u_long xid;
u_quad_t frev;
char *auth_str;
nmp = VFSTONFS(vp->v_mount);
MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
rep->r_nmp = nmp;
rep->r_vp = vp;
rep->r_procp = procp;
rep->r_procnum = procnum;
i = 0;
m = mrest;
while (m) {
i += m->m_len;
m = m->m_next;
}
mrest_len = i;
/*
* Get the RPC header with authorization.
*/
kerbauth:
auth_str = (char *)0;
if (nmp->nm_flag & NFSMNT_KERB) {
if (failed_auth) {
error = nfs_getauth(nmp, rep, cred, &auth_type,
&auth_str, &auth_len);
if (error) {
free((caddr_t)rep, M_NFSREQ);
m_freem(mrest);
return (error);
}
} else {
auth_type = RPCAUTH_UNIX;
auth_len = 5 * NFSX_UNSIGNED;
}
} else {
auth_type = RPCAUTH_UNIX;
if (cred->cr_ngroups < 1)
panic("nfsreq nogrps");
auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
5 * NFSX_UNSIGNED;
}
m = nfsm_rpchead(cred, (nmp->nm_flag & NFSMNT_NQNFS), procnum,
auth_type, auth_len, auth_str, mrest, mrest_len, &mheadend, &xid);
if (auth_str)
free(auth_str, M_TEMP);
/*
* For stream protocols, insert a Sun RPC Record Mark.
*/
if (nmp->nm_sotype == SOCK_STREAM) {
M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
*mtod(m, u_long *) = htonl(0x80000000 |
(m->m_pkthdr.len - NFSX_UNSIGNED));
}
rep->r_mreq = m;
rep->r_xid = xid;
tryagain:
if (nmp->nm_flag & NFSMNT_SOFT)
rep->r_retry = nmp->nm_retry;
else
rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */
rep->r_rtt = rep->r_rexmit = 0;
if (proct[procnum] > 0)
rep->r_flags = R_TIMING;
else
rep->r_flags = 0;
rep->r_mrep = NULL;
/*
* Do the client side RPC.
*/
nfsstats.rpcrequests++;
/*
* Chain request into list of outstanding requests. Be sure
* to put it LAST so timer finds oldest requests first.
*/
s = splsoftclock();
reph = &nfsreqh;
reph->r_prev->r_next = rep;
rep->r_prev = reph->r_prev;
reph->r_prev = rep;
rep->r_next = reph;
/* Get send time for nqnfs */
reqtime = time.tv_sec;
/*
* If backing off another request or avoiding congestion, don't
* send this one now but let timer do it. If not timing a request,
* do it now.
*/
if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
(nmp->nm_flag & NFSMNT_DUMBTIMR) ||
nmp->nm_sent < nmp->nm_cwnd)) {
splx(s);
if (nmp->nm_soflags & PR_CONNREQUIRED)
error = nfs_sndlock(&nmp->nm_flag, rep);
if (!error) {
m = m_copym(m, 0, M_COPYALL, M_WAIT);
error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep);
if (nmp->nm_soflags & PR_CONNREQUIRED)
nfs_sndunlock(&nmp->nm_flag);
}
if (!error && (rep->r_flags & R_MUSTRESEND) == 0) {
nmp->nm_sent += NFS_CWNDSCALE;
rep->r_flags |= R_SENT;
}
} else {
splx(s);
rep->r_rtt = -1;
}
/*
* Wait for the reply from our send or the timer's.
*/
if (!error || error == EPIPE)
error = nfs_reply(rep);
/*
* RPC done, unlink the request.
*/
s = splsoftclock();
rep->r_prev->r_next = rep->r_next;
rep->r_next->r_prev = rep->r_prev;
splx(s);
/*
* Decrement the outstanding request count.
*/
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT; /* paranoia */
nmp->nm_sent -= NFS_CWNDSCALE;
}
/*
* If there was a successful reply and a tprintf msg.
* tprintf a response.
*/
if (!error && (rep->r_flags & R_TPRINTFMSG))
nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname,
"is alive again");
mrep = rep->r_mrep;
md = rep->r_md;
dpos = rep->r_dpos;
if (error) {
m_freem(rep->r_mreq);
free((caddr_t)rep, M_NFSREQ);
return (error);
}
/*
* break down the rpc header and check if ok
*/
nfsm_dissect(tl, u_long *, 3*NFSX_UNSIGNED);
if (*tl++ == rpc_msgdenied) {
if (*tl == rpc_mismatch)
error = EOPNOTSUPP;
else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
if (*tl == rpc_rejectedcred && failed_auth == 0) {
failed_auth++;
mheadend->m_next = (struct mbuf *)0;
m_freem(mrep);
m_freem(rep->r_mreq);
goto kerbauth;
} else
error = EAUTH;
} else
error = EACCES;
m_freem(mrep);
m_freem(rep->r_mreq);
free((caddr_t)rep, M_NFSREQ);
return (error);
}
/*
* skip over the auth_verf, someday we may want to cache auth_short's
* for nfs_reqhead(), but for now just dump it
*/
if (*++tl != 0) {
i = nfsm_rndup(fxdr_unsigned(long, *tl));
nfsm_adv(i);
}
nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
/* 0 == ok */
if (*tl == 0) {
nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
if (*tl != 0) {
error = fxdr_unsigned(int, *tl);
m_freem(mrep);
if ((nmp->nm_flag & NFSMNT_NQNFS) &&
error == NQNFS_TRYLATER) {
error = 0;
waituntil = time.tv_sec + trylater_delay;
while (time.tv_sec < waituntil)
(void) tsleep((caddr_t)&lbolt,
PSOCK, "nqnfstry", 0);
trylater_delay *= nfs_backoff[trylater_cnt];
if (trylater_cnt < 7)
trylater_cnt++;
goto tryagain;
}
/*
* If the File Handle was stale, invalidate the
* lookup cache, just in case.
*/
if (error == ESTALE)
cache_purge(vp);
m_freem(rep->r_mreq);
free((caddr_t)rep, M_NFSREQ);
return (error);
}
/*
* For nqnfs, get any lease in reply
*/
if (nmp->nm_flag & NFSMNT_NQNFS) {
nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
if (*tl) {
np = VTONFS(vp);
nqlflag = fxdr_unsigned(int, *tl);
nfsm_dissect(tl, u_long *, 4*NFSX_UNSIGNED);
cachable = fxdr_unsigned(int, *tl++);
reqtime += fxdr_unsigned(int, *tl++);
if (reqtime > time.tv_sec) {
fxdr_hyper(tl, &frev);
nqnfs_clientlease(nmp, np, nqlflag,
cachable, reqtime, frev);
}
}
}
*mrp = mrep;
*mdp = md;
*dposp = dpos;
m_freem(rep->r_mreq);
FREE((caddr_t)rep, M_NFSREQ);
return (0);
}
m_freem(mrep);
m_freem(rep->r_mreq);
free((caddr_t)rep, M_NFSREQ);
error = EPROTONOSUPPORT;
nfsmout:
return (error);
}
/*
* Generate the rpc reply header
* siz arg. is used to decide if adding a cluster is worthwhile
*/
nfs_rephead(siz, nd, err, cache, frev, mrq, mbp, bposp)
int siz;
struct nfsd *nd;
int err;
int cache;
u_quad_t *frev;
struct mbuf **mrq;
struct mbuf **mbp;
caddr_t *bposp;
{
register u_long *tl;
register struct mbuf *mreq;
caddr_t bpos;
struct mbuf *mb, *mb2;
MGETHDR(mreq, M_WAIT, MT_DATA);
mb = mreq;
/*
* If this is a big reply, use a cluster else
* try and leave leading space for the lower level headers.
*/
siz += RPC_REPLYSIZ;
if (siz >= MINCLSIZE) {
MCLGET(mreq, M_WAIT);
} else
mreq->m_data += max_hdr;
tl = mtod(mreq, u_long *);
mreq->m_len = 6*NFSX_UNSIGNED;
bpos = ((caddr_t)tl)+mreq->m_len;
*tl++ = nd->nd_retxid;
*tl++ = rpc_reply;
if (err == ERPCMISMATCH || err == NQNFS_AUTHERR) {
*tl++ = rpc_msgdenied;
if (err == NQNFS_AUTHERR) {
*tl++ = rpc_autherr;
*tl = rpc_rejectedcred;
mreq->m_len -= NFSX_UNSIGNED;
bpos -= NFSX_UNSIGNED;
} else {
*tl++ = rpc_mismatch;
*tl++ = txdr_unsigned(2);
*tl = txdr_unsigned(2);
}
} else {
*tl++ = rpc_msgaccepted;
*tl++ = 0;
*tl++ = 0;
switch (err) {
case EPROGUNAVAIL:
*tl = txdr_unsigned(RPC_PROGUNAVAIL);
break;
case EPROGMISMATCH:
*tl = txdr_unsigned(RPC_PROGMISMATCH);
nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED);
*tl++ = txdr_unsigned(2);
*tl = txdr_unsigned(2); /* someday 3 */
break;
case EPROCUNAVAIL:
*tl = txdr_unsigned(RPC_PROCUNAVAIL);
break;
default:
*tl = 0;
if (err != VNOVAL) {
nfsm_build(tl, u_long *, NFSX_UNSIGNED);
if (err)
*tl = txdr_unsigned(nfsrv_errmap[err - 1]);
else
*tl = 0;
}
break;
};
}
/*
* For nqnfs, piggyback lease as requested.
*/
if (nd->nd_nqlflag != NQL_NOVAL && err == 0) {
if (nd->nd_nqlflag) {
nfsm_build(tl, u_long *, 5*NFSX_UNSIGNED);
*tl++ = txdr_unsigned(nd->nd_nqlflag);
*tl++ = txdr_unsigned(cache);
*tl++ = txdr_unsigned(nd->nd_duration);
txdr_hyper(frev, tl);
} else {
if (nd->nd_nqlflag != 0)
panic("nqreph");
nfsm_build(tl, u_long *, NFSX_UNSIGNED);
*tl = 0;
}
}
*mrq = mreq;
*mbp = mb;
*bposp = bpos;
if (err != 0 && err != VNOVAL)
nfsstats.srvrpc_errs++;
return (0);
}
/*
* Nfs timer routine
* Scan the nfsreq list and retranmit any requests that have timed out
* To avoid retransmission attempts on STREAM sockets (in the future) make
* sure to set the r_retry field to 0 (implies nm_retry == 0).
*/
void
nfs_timer(arg)
void *arg;
{
register struct nfsreq *rep;
register struct mbuf *m;
register struct socket *so;
register struct nfsmount *nmp;
register int timeo;
static long lasttime = 0;
int s, error;
s = splnet();
for (rep = nfsreqh.r_next; rep != &nfsreqh; rep = rep->r_next) {
nmp = rep->r_nmp;
if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
continue;
if (nfs_sigintr(nmp, rep, rep->r_procp)) {
rep->r_flags |= R_SOFTTERM;
continue;
}
if (rep->r_rtt >= 0) {
rep->r_rtt++;
if (nmp->nm_flag & NFSMNT_DUMBTIMR)
timeo = nmp->nm_timeo;
else
timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
if (nmp->nm_timeouts > 0)
timeo *= nfs_backoff[nmp->nm_timeouts - 1];
if (rep->r_rtt <= timeo)
continue;
if (nmp->nm_timeouts < 8)
nmp->nm_timeouts++;
}
/*
* Check for server not responding
*/
if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
rep->r_rexmit > nmp->nm_deadthresh) {
nfs_msg(rep->r_procp,
nmp->nm_mountp->mnt_stat.f_mntfromname,
"not responding");
rep->r_flags |= R_TPRINTFMSG;
}
if (rep->r_rexmit >= rep->r_retry) { /* too many */
nfsstats.rpctimeouts++;
rep->r_flags |= R_SOFTTERM;
continue;
}
if (nmp->nm_sotype != SOCK_DGRAM) {
if (++rep->r_rexmit > NFS_MAXREXMIT)
rep->r_rexmit = NFS_MAXREXMIT;
continue;
}
if ((so = nmp->nm_so) == NULL)
continue;
/*
* If there is enough space and the window allows..
* Resend it
* Set r_rtt to -1 in case we fail to send it now.
*/
rep->r_rtt = -1;
if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
(rep->r_flags & R_SENT) ||
nmp->nm_sent < nmp->nm_cwnd) &&
(m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){
if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m,
(struct mbuf *)0, (struct mbuf *)0);
else
error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m,
nmp->nm_nam, (struct mbuf *)0);
if (error) {
if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
so->so_error = 0;
} else {
/*
* Iff first send, start timing
* else turn timing off, backoff timer
* and divide congestion window by 2.
*/
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_TIMING;
if (++rep->r_rexmit > NFS_MAXREXMIT)
rep->r_rexmit = NFS_MAXREXMIT;
nmp->nm_cwnd >>= 1;
if (nmp->nm_cwnd < NFS_CWNDSCALE)
nmp->nm_cwnd = NFS_CWNDSCALE;
nfsstats.rpcretries++;
} else {
rep->r_flags |= R_SENT;
nmp->nm_sent += NFS_CWNDSCALE;
}
rep->r_rtt = 0;
}
}
}
/*
* Call the nqnfs server timer once a second to handle leases.
*/
if (lasttime != time.tv_sec) {
lasttime = time.tv_sec;
nqnfs_serverd();
}
splx(s);
timeout(nfs_timer, (void *)0, hz / NFS_HZ);
}
/*
* Test for a termination condition pending on the process.
* This is used for NFSMNT_INT mounts.
*/
nfs_sigintr(nmp, rep, p)
struct nfsmount *nmp;
struct nfsreq *rep;
register struct proc *p;
{
if (rep && (rep->r_flags & R_SOFTTERM))
return (EINTR);
if (!(nmp->nm_flag & NFSMNT_INT))
return (0);
if (p && p->p_sig && (((p->p_sig &~ p->p_sigmask) &~ p->p_sigignore) &
NFSINT_SIGMASK))
return (EINTR);
return (0);
}
/*
* Lock a socket against others.
* Necessary for STREAM sockets to ensure you get an entire rpc request/reply
* and also to avoid race conditions between the processes with nfs requests
* in progress when a reconnect is necessary.
*/
nfs_sndlock(flagp, rep)
register int *flagp;
struct nfsreq *rep;
{
struct proc *p;
int slpflag = 0, slptimeo = 0;
if (rep) {
p = rep->r_procp;
if (rep->r_nmp->nm_flag & NFSMNT_INT)
slpflag = PCATCH;
} else
p = (struct proc *)0;
while (*flagp & NFSMNT_SNDLOCK) {
if (nfs_sigintr(rep->r_nmp, rep, p))
return (EINTR);
*flagp |= NFSMNT_WANTSND;
(void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck",
slptimeo);
if (slpflag == PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
}
*flagp |= NFSMNT_SNDLOCK;
return (0);
}
/*
* Unlock the stream socket for others.
*/
void
nfs_sndunlock(flagp)
register int *flagp;
{
if ((*flagp & NFSMNT_SNDLOCK) == 0)
panic("nfs sndunlock");
*flagp &= ~NFSMNT_SNDLOCK;
if (*flagp & NFSMNT_WANTSND) {
*flagp &= ~NFSMNT_WANTSND;
wakeup((caddr_t)flagp);
}
}
nfs_rcvlock(rep)
register struct nfsreq *rep;
{
register int *flagp = &rep->r_nmp->nm_flag;
int slpflag, slptimeo = 0;
if (*flagp & NFSMNT_INT)
slpflag = PCATCH;
else
slpflag = 0;
while (*flagp & NFSMNT_RCVLOCK) {
if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp))
return (EINTR);
*flagp |= NFSMNT_WANTRCV;
(void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsrcvlk",
slptimeo);
if (slpflag == PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
}
*flagp |= NFSMNT_RCVLOCK;
return (0);
}
/*
* Unlock the stream socket for others.
*/
void
nfs_rcvunlock(flagp)
register int *flagp;
{
if ((*flagp & NFSMNT_RCVLOCK) == 0)
panic("nfs rcvunlock");
*flagp &= ~NFSMNT_RCVLOCK;
if (*flagp & NFSMNT_WANTRCV) {
*flagp &= ~NFSMNT_WANTRCV;
wakeup((caddr_t)flagp);
}
}
/*
* Check for badly aligned mbuf data areas and
* realign data in an mbuf list by copying the data areas up, as required.
*/
void
nfs_realign(m, hsiz)
register struct mbuf *m;
int hsiz;
{
register struct mbuf *m2;
register int siz, mlen, olen;
register caddr_t tcp, fcp;
struct mbuf *mnew;
while (m) {
/*
* This never happens for UDP, rarely happens for TCP
* but frequently happens for iso transport.
*/
if ((m->m_len & 0x3) || (mtod(m, int) & 0x3)) {
olen = m->m_len;
fcp = mtod(m, caddr_t);
if ((int)fcp & 0x3) {
m->m_flags &= ~M_PKTHDR;
if (m->m_flags & M_EXT)
m->m_data = m->m_ext.ext_buf +
((m->m_ext.ext_size - olen) & ~0x3);
else
m->m_data = m->m_dat;
}
m->m_len = 0;
tcp = mtod(m, caddr_t);
mnew = m;
m2 = m->m_next;
/*
* If possible, only put the first invariant part
* of the RPC header in the first mbuf.
*/
mlen = M_TRAILINGSPACE(m);
if (olen <= hsiz && mlen > hsiz)
mlen = hsiz;
/*
* Loop through the mbuf list consolidating data.
*/
while (m) {
while (olen > 0) {
if (mlen == 0) {
m2->m_flags &= ~M_PKTHDR;
if (m2->m_flags & M_EXT)
m2->m_data = m2->m_ext.ext_buf;
else
m2->m_data = m2->m_dat;
m2->m_len = 0;
mlen = M_TRAILINGSPACE(m2);
tcp = mtod(m2, caddr_t);
mnew = m2;
m2 = m2->m_next;
}
siz = min(mlen, olen);
if (tcp != fcp)
bcopy(fcp, tcp, siz);
mnew->m_len += siz;
mlen -= siz;
olen -= siz;
tcp += siz;
fcp += siz;
}
m = m->m_next;
if (m) {
olen = m->m_len;
fcp = mtod(m, caddr_t);
}
}
/*
* Finally, set m_len == 0 for any trailing mbufs that have
* been copied out of.
*/
while (m2) {
m2->m_len = 0;
m2 = m2->m_next;
}
return;
}
m = m->m_next;
}
}
/*
* Socket upcall routine for the nfsd sockets.
* The caddr_t arg is a pointer to the "struct nfssvc_sock".
* Essentially do as much as possible non-blocking, else punt and it will
* be called with M_WAIT from an nfsd.
*/
void
nfsrv_rcv(so, arg, waitflag)
struct socket *so;
caddr_t arg;
int waitflag;
{
register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
register struct mbuf *m;
struct mbuf *mp, *nam;
struct uio auio;
int flags, error;
if ((slp->ns_flag & SLP_VALID) == 0)
return;
#ifdef notdef
/*
* Define this to test for nfsds handling this under heavy load.
*/
if (waitflag == M_DONTWAIT) {
slp->ns_flag |= SLP_NEEDQ; goto dorecs;
}
#endif
auio.uio_procp = NULL;
if (so->so_type == SOCK_STREAM) {
/*
* If there are already records on the queue, defer soreceive()
* to an nfsd so that there is feedback to the TCP layer that
* the nfs servers are heavily loaded.
*/
if (slp->ns_rec && waitflag == M_DONTWAIT) {
slp->ns_flag |= SLP_NEEDQ;
goto dorecs;
}
/*
* Do soreceive().
*/
auio.uio_resid = 1000000000;
flags = MSG_DONTWAIT;
error = soreceive(so, &nam, &auio, &mp, (struct mbuf **)0, &flags);
if (error || mp == (struct mbuf *)0) {
if (error == EWOULDBLOCK)
slp->ns_flag |= SLP_NEEDQ;
else
slp->ns_flag |= SLP_DISCONN;
goto dorecs;
}
m = mp;
if (slp->ns_rawend) {
slp->ns_rawend->m_next = m;
slp->ns_cc += 1000000000 - auio.uio_resid;
} else {
slp->ns_raw = m;
slp->ns_cc = 1000000000 - auio.uio_resid;
}
while (m->m_next)
m = m->m_next;
slp->ns_rawend = m;
/*
* Now try and parse record(s) out of the raw stream data.
*/
if (error = nfsrv_getstream(slp, waitflag)) {
if (error == EPERM)
slp->ns_flag |= SLP_DISCONN;
else
slp->ns_flag |= SLP_NEEDQ;
}
} else {
do {
auio.uio_resid = 1000000000;
flags = MSG_DONTWAIT;
error = soreceive(so, &nam, &auio, &mp,
(struct mbuf **)0, &flags);
if (mp) {
nfs_realign(mp, 10 * NFSX_UNSIGNED);
if (nam) {
m = nam;
m->m_next = mp;
} else
m = mp;
if (slp->ns_recend)
slp->ns_recend->m_nextpkt = m;
else
slp->ns_rec = m;
slp->ns_recend = m;
m->m_nextpkt = (struct mbuf *)0;
}
if (error) {
if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
&& error != EWOULDBLOCK) {
slp->ns_flag |= SLP_DISCONN;
goto dorecs;
}
}
} while (mp);
}
/*
* Now try and process the request records, non-blocking.
*/
dorecs:
if (waitflag == M_DONTWAIT &&
(slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN))))
nfsrv_wakenfsd(slp);
}
/*
* Try and extract an RPC request from the mbuf data list received on a
* stream socket. The "waitflag" argument indicates whether or not it
* can sleep.
*/
nfsrv_getstream(slp, waitflag)
register struct nfssvc_sock *slp;
int waitflag;
{
register struct mbuf *m;
register char *cp1, *cp2;
register int len;
struct mbuf *om, *m2, *recm;
u_long recmark;
if (slp->ns_flag & SLP_GETSTREAM)
panic("nfs getstream");
slp->ns_flag |= SLP_GETSTREAM;
for (;;) {
if (slp->ns_reclen == 0) {
if (slp->ns_cc < NFSX_UNSIGNED) {
slp->ns_flag &= ~SLP_GETSTREAM;
return (0);
}
m = slp->ns_raw;
if (m->m_len >= NFSX_UNSIGNED) {
bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
m->m_data += NFSX_UNSIGNED;
m->m_len -= NFSX_UNSIGNED;
} else {
cp1 = (caddr_t)&recmark;
cp2 = mtod(m, caddr_t);
while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
while (m->m_len == 0) {
m = m->m_next;
cp2 = mtod(m, caddr_t);
}
*cp1++ = *cp2++;
m->m_data++;
m->m_len--;
}
}
slp->ns_cc -= NFSX_UNSIGNED;
slp->ns_reclen = ntohl(recmark) & ~0x80000000;
if (slp->ns_reclen < NFS_MINPACKET || slp->ns_reclen > NFS_MAXPACKET) {
slp->ns_flag &= ~SLP_GETSTREAM;
return (EPERM);
}
}
/*
* Now get the record part.
*/
if (slp->ns_cc == slp->ns_reclen) {
recm = slp->ns_raw;
slp->ns_raw = slp->ns_rawend = (struct mbuf *)0;
slp->ns_cc = slp->ns_reclen = 0;
} else if (slp->ns_cc > slp->ns_reclen) {
len = 0;
m = slp->ns_raw;
om = (struct mbuf *)0;
while (len < slp->ns_reclen) {
if ((len + m->m_len) > slp->ns_reclen) {
m2 = m_copym(m, 0, slp->ns_reclen - len,
waitflag);
if (m2) {
if (om) {
om->m_next = m2;
recm = slp->ns_raw;
} else
recm = m2;
m->m_data += slp->ns_reclen - len;
m->m_len -= slp->ns_reclen - len;
len = slp->ns_reclen;
} else {
slp->ns_flag &= ~SLP_GETSTREAM;
return (EWOULDBLOCK);
}
} else if ((len + m->m_len) == slp->ns_reclen) {
om = m;
len += m->m_len;
m = m->m_next;
recm = slp->ns_raw;
om->m_next = (struct mbuf *)0;
} else {
om = m;
len += m->m_len;
m = m->m_next;
}
}
slp->ns_raw = m;
slp->ns_cc -= len;
slp->ns_reclen = 0;
} else {
slp->ns_flag &= ~SLP_GETSTREAM;
return (0);
}
nfs_realign(recm, 10 * NFSX_UNSIGNED);
if (slp->ns_recend)
slp->ns_recend->m_nextpkt = recm;
else
slp->ns_rec = recm;
slp->ns_recend = recm;
}
}
/*
* Parse an RPC header.
*/
nfsrv_dorec(slp, nd)
register struct nfssvc_sock *slp;
register struct nfsd *nd;
{
register struct mbuf *m;
int error;
if ((slp->ns_flag & SLP_VALID) == 0 ||
(m = slp->ns_rec) == (struct mbuf *)0)
return (ENOBUFS);
if (slp->ns_rec = m->m_nextpkt)
m->m_nextpkt = (struct mbuf *)0;
else
slp->ns_recend = (struct mbuf *)0;
if (m->m_type == MT_SONAME) {
nd->nd_nam = m;
nd->nd_md = nd->nd_mrep = m->m_next;
m->m_next = (struct mbuf *)0;
} else {
nd->nd_nam = (struct mbuf *)0;
nd->nd_md = nd->nd_mrep = m;
}
nd->nd_dpos = mtod(nd->nd_md, caddr_t);
if (error = nfs_getreq(nd, TRUE)) {
m_freem(nd->nd_nam);
return (error);
}
return (0);
}
/*
* Parse an RPC request
* - verify it
* - fill in the cred struct.
*/
nfs_getreq(nd, has_header)
register struct nfsd *nd;
int has_header;
{
register int len, i;
register u_long *tl;
register long t1;
struct uio uio;
struct iovec iov;
caddr_t dpos, cp2;
u_long nfsvers, auth_type;
int error = 0, nqnfs = 0;
struct mbuf *mrep, *md;
mrep = nd->nd_mrep;
md = nd->nd_md;
dpos = nd->nd_dpos;
if (has_header) {
nfsm_dissect(tl, u_long *, 10*NFSX_UNSIGNED);
nd->nd_retxid = *tl++;
if (*tl++ != rpc_call) {
m_freem(mrep);
return (EBADRPC);
}
} else {
nfsm_dissect(tl, u_long *, 8*NFSX_UNSIGNED);
}
nd->nd_repstat = 0;
if (*tl++ != rpc_vers) {
nd->nd_repstat = ERPCMISMATCH;
nd->nd_procnum = NFSPROC_NOOP;
return (0);
}
nfsvers = nfs_vers;
if (*tl != nfs_prog) {
if (*tl == nqnfs_prog) {
nqnfs++;
nfsvers = nqnfs_vers;
} else {
nd->nd_repstat = EPROGUNAVAIL;
nd->nd_procnum = NFSPROC_NOOP;
return (0);
}
}
tl++;
if (*tl++ != nfsvers) {
nd->nd_repstat = EPROGMISMATCH;
nd->nd_procnum = NFSPROC_NOOP;
return (0);
}
nd->nd_procnum = fxdr_unsigned(u_long, *tl++);
if (nd->nd_procnum == NFSPROC_NULL)
return (0);
if (nd->nd_procnum >= NFS_NPROCS ||
(!nqnfs && nd->nd_procnum > NFSPROC_STATFS) ||
(*tl != rpc_auth_unix && *tl != rpc_auth_kerb)) {
nd->nd_repstat = EPROCUNAVAIL;
nd->nd_procnum = NFSPROC_NOOP;
return (0);
}
auth_type = *tl++;
len = fxdr_unsigned(int, *tl++);
if (len < 0 || len > RPCAUTH_MAXSIZ) {
m_freem(mrep);
return (EBADRPC);
}
/*
* Handle auth_unix or auth_kerb.
*/
if (auth_type == rpc_auth_unix) {
len = fxdr_unsigned(int, *++tl);
if (len < 0 || len > NFS_MAXNAMLEN) {
m_freem(mrep);
return (EBADRPC);
}
nfsm_adv(nfsm_rndup(len));
nfsm_dissect(tl, u_long *, 3*NFSX_UNSIGNED);
nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
len = fxdr_unsigned(int, *tl);
if (len < 0 || len > RPCAUTH_UNIXGIDS) {
m_freem(mrep);
return (EBADRPC);
}
nfsm_dissect(tl, u_long *, (len + 2)*NFSX_UNSIGNED);
for (i = 1; i <= len; i++)
if (i < NGROUPS)
nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
else
tl++;
nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
} else if (auth_type == rpc_auth_kerb) {
nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
nd->nd_authlen = fxdr_unsigned(int, *tl);
uio.uio_resid = nfsm_rndup(nd->nd_authlen);
if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
m_freem(mrep);
return (EBADRPC);
}
uio.uio_offset = 0;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_segflg = UIO_SYSSPACE;
iov.iov_base = (caddr_t)nd->nd_authstr;
iov.iov_len = RPCAUTH_MAXSIZ;
nfsm_mtouio(&uio, uio.uio_resid);
nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED);
nd->nd_flag |= NFSD_NEEDAUTH;
}
/*
* Do we have any use for the verifier.
* According to the "Remote Procedure Call Protocol Spec." it
* should be AUTH_NULL, but some clients make it AUTH_UNIX?
* For now, just skip over it
*/
len = fxdr_unsigned(int, *++tl);
if (len < 0 || len > RPCAUTH_MAXSIZ) {
m_freem(mrep);
return (EBADRPC);
}
if (len > 0) {
nfsm_adv(nfsm_rndup(len));
}
/*
* For nqnfs, get piggybacked lease request.
*/
if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) {
nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
nd->nd_nqlflag = fxdr_unsigned(int, *tl);
if (nd->nd_nqlflag) {
nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
nd->nd_duration = fxdr_unsigned(int, *tl);
} else
nd->nd_duration = NQ_MINLEASE;
} else {
nd->nd_nqlflag = NQL_NOVAL;
nd->nd_duration = NQ_MINLEASE;
}
nd->nd_md = md;
nd->nd_dpos = dpos;
return (0);
nfsmout:
return (error);
}
/*
* Search for a sleeping nfsd and wake it up.
* SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the
* running nfsds will go look for the work in the nfssvc_sock list.
*/
void
nfsrv_wakenfsd(slp)
struct nfssvc_sock *slp;
{
register struct nfsd *nd = nfsd_head.nd_next;
if ((slp->ns_flag & SLP_VALID) == 0)
return;
while (nd != (struct nfsd *)&nfsd_head) {
if (nd->nd_flag & NFSD_WAITING) {
nd->nd_flag &= ~NFSD_WAITING;
if (nd->nd_slp)
panic("nfsd wakeup");
slp->ns_sref++;
nd->nd_slp = slp;
wakeup((caddr_t)nd);
return;
}
nd = nd->nd_next;
}
slp->ns_flag |= SLP_DOREC;
nfsd_head.nd_flag |= NFSD_CHECKSLP;
}
nfs_msg(p, server, msg)
struct proc *p;
char *server, *msg;
{
tpr_t tpr;
if (p)
tpr = tprintf_open(p);
else
tpr = NULL;
tprintf(tpr, "nfs server %s: %s\n", server, msg);
tprintf_close(tpr);
}