2 * Copyright (c) 1989, 1991, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95
37 * $FreeBSD: src/sys/nfs/nfs_socket.c,v 1.60.2.6 2003/03/26 01:44:46 alfred Exp $
38 * $DragonFly: src/sys/vfs/nfs/nfs_socket.c,v 1.4 2003/07/01 18:48:31 dillon Exp $
42 * Socket operations for use by nfs
45 #include <sys/param.h>
46 #include <sys/systm.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/kernel.h>
52 #include <sys/vnode.h>
53 #include <sys/protosw.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/syslog.h>
57 #include <sys/tprintf.h>
58 #include <sys/sysctl.h>
59 #include <sys/signalvar.h>
61 #include <netinet/in.h>
62 #include <netinet/tcp.h>
64 #include <nfs/rpcv2.h>
65 #include <nfs/nfsproto.h>
67 #include <nfs/xdr_subs.h>
68 #include <nfs/nfsm_subs.h>
69 #include <nfs/nfsmount.h>
70 #include <nfs/nfsnode.h>
71 #include <nfs/nfsrtt.h>
72 #include <nfs/nqnfs.h>
78 * Estimate rto for an nfs rpc sent via. an unreliable datagram.
79 * Use the mean and mean deviation of rtt for the appropriate type of rpc
80 * for the frequent rpcs and a default for the others.
81 * The justification for doing "other" this way is that these rpcs
82 * happen so infrequently that timer est. would probably be stale.
83 * Also, since many of these rpcs are
84 * non-idempotent, a conservative timeout is desired.
85 * getattr, lookup - A+2D
89 #define NFS_RTO(n, t) \
90 ((t) == 0 ? (n)->nm_timeo : \
92 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
93 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
94 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
95 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
97 * External data, mostly RPC constants in XDR form
99 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers,
100 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr,
102 extern u_int32_t nfs_prog, nqnfs_prog;
103 extern time_t nqnfsstarttime;
104 extern struct nfsstats nfsstats;
105 extern int nfsv3_procid[NFS_NPROCS];
106 extern int nfs_ticks;
109 * Defines which timer to use for the procnum.
116 static int proct[NFS_NPROCS] = {
117 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0,
121 static int nfs_realign_test;
122 static int nfs_realign_count;
123 static int nfs_bufpackets = 4;
125 SYSCTL_DECL(_vfs_nfs);
127 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
128 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
129 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, "");
133 * There is a congestion window for outstanding rpcs maintained per mount
134 * point. The cwnd size is adjusted in roughly the way that:
135 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of
136 * SIGCOMM '88". ACM, August 1988.
137 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout
138 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd
139 * of rpcs is in progress.
140 * (The sent count and cwnd are scaled for integer arith.)
141 * Variants of "slow start" were tried and were found to be too much of a
142 * performance hit (ave. rtt 3 times larger),
143 * I suspect due to the large rtt that nfs rpcs have.
145 #define NFS_CWNDSCALE 256
146 #define NFS_MAXCWND (NFS_CWNDSCALE * 32)
147 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
149 struct nfsrtt nfsrtt;
150 struct callout_handle nfs_timer_handle;
152 static int nfs_msg __P((struct thread *,char *,char *));
153 static int nfs_rcvlock __P((struct nfsreq *));
154 static void nfs_rcvunlock __P((struct nfsreq *));
155 static void nfs_realign __P((struct mbuf **pm, int hsiz));
156 static int nfs_receive __P((struct nfsreq *rep, struct sockaddr **aname,
158 static void nfs_softterm __P((struct nfsreq *rep));
159 static int nfs_reconnect __P((struct nfsreq *rep));
161 static int nfsrv_getstream __P((struct nfssvc_sock *,int));
163 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *nd,
164 struct nfssvc_sock *slp,
166 struct mbuf **mreqp)) = {
194 #endif /* NFS_NOSERVER */
197 * Initialize sockets and congestion for a new NFS connection.
198 * We do not free the sockaddr if error.
201 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
204 int s, error, rcvreserve, sndreserve;
206 struct sockaddr *saddr;
207 struct sockaddr_in *sin;
208 struct thread *td = &thread0; /* only used for socreate and sobind */
210 nmp->nm_so = (struct socket *)0;
212 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype,
213 nmp->nm_soproto, td);
217 nmp->nm_soflags = so->so_proto->pr_flags;
220 * Some servers require that the client port be a reserved port number.
222 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
225 struct sockaddr_in ssin;
227 bzero(&sopt, sizeof sopt);
228 ip = IP_PORTRANGE_LOW;
229 sopt.sopt_dir = SOPT_SET;
230 sopt.sopt_level = IPPROTO_IP;
231 sopt.sopt_name = IP_PORTRANGE;
232 sopt.sopt_val = (void *)&ip;
233 sopt.sopt_valsize = sizeof(ip);
235 error = sosetopt(so, &sopt);
238 bzero(&ssin, sizeof ssin);
240 sin->sin_len = sizeof (struct sockaddr_in);
241 sin->sin_family = AF_INET;
242 sin->sin_addr.s_addr = INADDR_ANY;
243 sin->sin_port = htons(0);
244 error = sobind(so, (struct sockaddr *)sin, td);
247 bzero(&sopt, sizeof sopt);
248 ip = IP_PORTRANGE_DEFAULT;
249 sopt.sopt_dir = SOPT_SET;
250 sopt.sopt_level = IPPROTO_IP;
251 sopt.sopt_name = IP_PORTRANGE;
252 sopt.sopt_val = (void *)&ip;
253 sopt.sopt_valsize = sizeof(ip);
255 error = sosetopt(so, &sopt);
261 * Protocols that do not require connections may be optionally left
262 * unconnected for servers that reply from a port other than NFS_PORT.
264 if (nmp->nm_flag & NFSMNT_NOCONN) {
265 if (nmp->nm_soflags & PR_CONNREQUIRED) {
270 error = soconnect(so, nmp->nm_nam, td);
275 * Wait for the connection to complete. Cribbed from the
276 * connect system call but with the wait timing out so
277 * that interruptible mounts don't hang here for a long time.
280 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
281 (void) tsleep((caddr_t)&so->so_timeo, PSOCK,
283 if ((so->so_state & SS_ISCONNECTING) &&
284 so->so_error == 0 && rep &&
285 (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){
286 so->so_state &= ~SS_ISCONNECTING;
292 error = so->so_error;
299 so->so_rcv.sb_timeo = (5 * hz);
300 so->so_snd.sb_timeo = (5 * hz);
303 * Get buffer reservation size from sysctl, but impose reasonable
306 pktscale = nfs_bufpackets;
312 if (nmp->nm_sotype == SOCK_DGRAM) {
313 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
314 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
315 NFS_MAXPKTHDR) * pktscale;
316 } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
317 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
318 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
319 NFS_MAXPKTHDR) * pktscale;
321 if (nmp->nm_sotype != SOCK_STREAM)
322 panic("nfscon sotype");
323 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
327 bzero(&sopt, sizeof sopt);
328 sopt.sopt_level = SOL_SOCKET;
329 sopt.sopt_name = SO_KEEPALIVE;
330 sopt.sopt_val = &val;
331 sopt.sopt_valsize = sizeof val;
335 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
339 bzero(&sopt, sizeof sopt);
340 sopt.sopt_level = IPPROTO_TCP;
341 sopt.sopt_name = TCP_NODELAY;
342 sopt.sopt_val = &val;
343 sopt.sopt_valsize = sizeof val;
347 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
348 sizeof (u_int32_t)) * pktscale;
349 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
350 sizeof (u_int32_t)) * pktscale;
352 error = soreserve(so, sndreserve, rcvreserve);
355 so->so_rcv.sb_flags |= SB_NOINTR;
356 so->so_snd.sb_flags |= SB_NOINTR;
358 /* Initialize other non-zero congestion variables */
359 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] =
360 nmp->nm_srtt[3] = (NFS_TIMEO << 3);
361 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
362 nmp->nm_sdrtt[3] = 0;
363 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */
365 nmp->nm_timeouts = 0;
375 * Called when a connection is broken on a reliable protocol.
376 * - clean up the old socket
377 * - nfs_connect() again
378 * - set R_MUSTRESEND for all outstanding requests on mount point
379 * If this fails the mount point is DEAD!
380 * nb: Must be called with the nfs_sndlock() set on the mount point.
384 register struct nfsreq *rep;
386 register struct nfsreq *rp;
387 register struct nfsmount *nmp = rep->r_nmp;
391 while ((error = nfs_connect(nmp, rep)) != 0) {
392 if (error == EINTR || error == ERESTART)
394 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0);
398 * Loop through outstanding request list and fix up all requests
401 for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) {
402 if (rp->r_nmp == nmp)
403 rp->r_flags |= R_MUSTRESEND;
409 * NFS disconnect. Clean up and unlink.
413 register struct nfsmount *nmp;
415 register struct socket *so;
419 nmp->nm_so = (struct socket *)0;
426 nfs_safedisconnect(nmp)
427 struct nfsmount *nmp;
429 struct nfsreq dummyreq;
431 bzero(&dummyreq, sizeof(dummyreq));
432 dummyreq.r_nmp = nmp;
433 nfs_rcvlock(&dummyreq);
435 nfs_rcvunlock(&dummyreq);
439 * This is the nfs send routine. For connection based socket types, it
440 * must be called with an nfs_sndlock() on the socket.
441 * "rep == NULL" indicates that it has been called from a server.
442 * For the client side:
443 * - return EINTR if the RPC is terminated, 0 otherwise
444 * - set R_MUSTRESEND if the send fails for any reason
445 * - do any cleanup required by recoverable socket errors (?)
446 * For the server side:
447 * - return EINTR or ERESTART if interrupted by a signal
448 * - return EPIPE if a connection is lost for connection based sockets (TCP...)
449 * - do any cleanup required by recoverable socket errors (?)
452 nfs_send(so, nam, top, rep)
453 register struct socket *so;
454 struct sockaddr *nam;
455 register struct mbuf *top;
458 struct sockaddr *sendnam;
459 int error, soflags, flags;
462 if (rep->r_flags & R_SOFTTERM) {
466 if ((so = rep->r_nmp->nm_so) == NULL) {
467 rep->r_flags |= R_MUSTRESEND;
471 rep->r_flags &= ~R_MUSTRESEND;
472 soflags = rep->r_nmp->nm_soflags;
474 soflags = so->so_proto->pr_flags;
475 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
476 sendnam = (struct sockaddr *)0;
479 if (so->so_type == SOCK_SEQPACKET)
484 error = so->so_proto->pr_usrreqs->pru_sosend
485 (so, sendnam, 0, top, 0, flags, curthread /*XXX*/);
487 * ENOBUFS for dgram sockets is transient and non fatal.
488 * No need to log, and no need to break a soft mount.
490 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) {
492 if (rep) /* do backoff retransmit on client */
493 rep->r_flags |= R_MUSTRESEND;
498 log(LOG_INFO, "nfs send error %d for server %s\n",error,
499 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
501 * Deal with errors for the client side.
503 if (rep->r_flags & R_SOFTTERM)
506 rep->r_flags |= R_MUSTRESEND;
508 log(LOG_INFO, "nfsd send error %d\n", error);
511 * Handle any recoverable (soft) socket errors here. (?)
513 if (error != EINTR && error != ERESTART &&
514 error != EWOULDBLOCK && error != EPIPE)
521 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
522 * done by soreceive(), but for SOCK_STREAM we must deal with the Record
523 * Mark and consolidate the data into a new mbuf list.
524 * nb: Sometimes TCP passes the data up to soreceive() in long lists of
526 * For SOCK_STREAM we must be very careful to read an entire record once
527 * we have read any of it, even if the system call has been interrupted.
530 nfs_receive(struct nfsreq *rep, struct sockaddr **aname, struct mbuf **mp)
532 register struct socket *so;
535 register struct mbuf *m;
536 struct mbuf *control;
538 struct sockaddr **getnam;
539 int error, sotype, rcvflg;
540 struct thread *td = curthread; /* XXX */
543 * Set up arguments for soreceive()
545 *mp = (struct mbuf *)0;
546 *aname = (struct sockaddr *)0;
547 sotype = rep->r_nmp->nm_sotype;
550 * For reliable protocols, lock against other senders/receivers
551 * in case a reconnect is necessary.
552 * For SOCK_STREAM, first get the Record Mark to find out how much
553 * more there is to get.
554 * We must lock the socket against other receivers
555 * until we have an entire rpc request/reply.
557 if (sotype != SOCK_DGRAM) {
558 error = nfs_sndlock(rep);
563 * Check for fatal errors and resending request.
566 * Ugh: If a reconnect attempt just happened, nm_so
567 * would have changed. NULL indicates a failed
568 * attempt that has essentially shut down this
571 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
575 so = rep->r_nmp->nm_so;
577 error = nfs_reconnect(rep);
584 while (rep->r_flags & R_MUSTRESEND) {
585 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
586 nfsstats.rpcretries++;
587 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
589 if (error == EINTR || error == ERESTART ||
590 (error = nfs_reconnect(rep)) != 0) {
598 if (sotype == SOCK_STREAM) {
599 aio.iov_base = (caddr_t) &len;
600 aio.iov_len = sizeof(u_int32_t);
603 auio.uio_segflg = UIO_SYSSPACE;
604 auio.uio_rw = UIO_READ;
606 auio.uio_resid = sizeof(u_int32_t);
609 rcvflg = MSG_WAITALL;
610 error = so->so_proto->pr_usrreqs->pru_soreceive
611 (so, (struct sockaddr **)0, &auio,
612 (struct mbuf **)0, (struct mbuf **)0,
614 if (error == EWOULDBLOCK && rep) {
615 if (rep->r_flags & R_SOFTTERM)
618 } while (error == EWOULDBLOCK);
619 if (!error && auio.uio_resid > 0) {
621 * Don't log a 0 byte receive; it means
622 * that the socket has been closed, and
623 * can happen during normal operation
624 * (forcible unmount or Solaris server).
626 if (auio.uio_resid != sizeof (u_int32_t))
628 "short receive (%d/%d) from nfs server %s\n",
629 (int)(sizeof(u_int32_t) - auio.uio_resid),
630 (int)sizeof(u_int32_t),
631 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
636 len = ntohl(len) & ~0x80000000;
638 * This is SERIOUS! We are out of sync with the sender
639 * and forcing a disconnect/reconnect is all I can do.
641 if (len > NFS_MAXPACKET) {
642 log(LOG_ERR, "%s (%d) from nfs server %s\n",
643 "impossible packet length",
645 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
649 auio.uio_resid = len;
651 rcvflg = MSG_WAITALL;
652 error = so->so_proto->pr_usrreqs->pru_soreceive
653 (so, (struct sockaddr **)0,
654 &auio, mp, (struct mbuf **)0, &rcvflg);
655 } while (error == EWOULDBLOCK || error == EINTR ||
657 if (!error && auio.uio_resid > 0) {
658 if (len != auio.uio_resid)
660 "short receive (%d/%d) from nfs server %s\n",
661 len - auio.uio_resid, len,
662 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
667 * NB: Since uio_resid is big, MSG_WAITALL is ignored
668 * and soreceive() will return when it has either a
669 * control msg or a data msg.
670 * We have no use for control msg., but must grab them
671 * and then throw them away so we know what is going
674 auio.uio_resid = len = 100000000; /* Anything Big */
678 error = so->so_proto->pr_usrreqs->pru_soreceive
679 (so, (struct sockaddr **)0,
680 &auio, mp, &control, &rcvflg);
683 if (error == EWOULDBLOCK && rep) {
684 if (rep->r_flags & R_SOFTTERM)
687 } while (error == EWOULDBLOCK ||
688 (!error && *mp == NULL && control));
689 if ((rcvflg & MSG_EOR) == 0)
691 if (!error && *mp == NULL)
693 len -= auio.uio_resid;
696 if (error && error != EINTR && error != ERESTART) {
698 *mp = (struct mbuf *)0;
701 "receive error %d from nfs server %s\n",
703 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
704 error = nfs_sndlock(rep);
706 error = nfs_reconnect(rep);
714 if ((so = rep->r_nmp->nm_so) == NULL)
716 if (so->so_state & SS_ISCONNECTED)
717 getnam = (struct sockaddr **)0;
720 auio.uio_resid = len = 1000000;
724 error = so->so_proto->pr_usrreqs->pru_soreceive
725 (so, getnam, &auio, mp,
726 (struct mbuf **)0, &rcvflg);
727 if (error == EWOULDBLOCK &&
728 (rep->r_flags & R_SOFTTERM))
730 } while (error == EWOULDBLOCK);
731 len -= auio.uio_resid;
735 *mp = (struct mbuf *)0;
738 * Search for any mbufs that are not a multiple of 4 bytes long
739 * or with m_data not longword aligned.
740 * These could cause pointer alignment problems, so copy them to
741 * well aligned mbufs.
743 nfs_realign(mp, 5 * NFSX_UNSIGNED);
748 * Implement receipt of reply on a socket.
749 * We must search through the list of received datagrams matching them
750 * with outstanding requests using the xid, until ours is found.
755 struct nfsreq *myrep;
757 register struct nfsreq *rep;
758 register struct nfsmount *nmp = myrep->r_nmp;
760 struct mbuf *mrep, *md;
761 struct sockaddr *nam;
767 * Loop around until we get our own reply
771 * Lock against other receivers so that I don't get stuck in
772 * sbwait() after someone else has received my reply for me.
773 * Also necessary for connection based protocols to avoid
774 * race conditions during a reconnect.
775 * If nfs_rcvlock() returns EALREADY, that means that
776 * the reply has already been recieved by another
777 * process and we can return immediately. In this
778 * case, the lock is not taken to avoid races with
781 error = nfs_rcvlock(myrep);
782 if (error == EALREADY)
787 * Get the next Rpc reply off the socket
789 error = nfs_receive(myrep, &nam, &mrep);
790 nfs_rcvunlock(myrep);
794 * Ignore routing errors on connectionless protocols??
796 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
797 nmp->nm_so->so_error = 0;
798 if (myrep->r_flags & R_GETONEREP)
808 * Get the xid and check that it is an rpc reply
811 dpos = mtod(md, caddr_t);
812 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED);
814 if (*tl != rpc_reply) {
816 if (nmp->nm_flag & NFSMNT_NQNFS) {
817 if (nqnfs_callback(nmp, mrep, md, dpos))
818 nfsstats.rpcinvalid++;
820 nfsstats.rpcinvalid++;
824 nfsstats.rpcinvalid++;
828 if (myrep->r_flags & R_GETONEREP)
834 * Loop through the request list to match up the reply
835 * Iff no match, just drop the datagram
837 for (rep = nfs_reqq.tqh_first; rep != 0;
838 rep = rep->r_chain.tqe_next) {
839 if (rep->r_mrep == NULL && rxid == rep->r_xid) {
847 rt = &nfsrtt.rttl[nfsrtt.pos];
848 rt->proc = rep->r_procnum;
849 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]);
850 rt->sent = nmp->nm_sent;
851 rt->cwnd = nmp->nm_cwnd;
852 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
853 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
854 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
855 getmicrotime(&rt->tstamp);
856 if (rep->r_flags & R_TIMING)
857 rt->rtt = rep->r_rtt;
860 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
863 * Update congestion window.
864 * Do the additive increase of
867 if (nmp->nm_cwnd <= nmp->nm_sent) {
869 (NFS_CWNDSCALE * NFS_CWNDSCALE +
870 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
871 if (nmp->nm_cwnd > NFS_MAXCWND)
872 nmp->nm_cwnd = NFS_MAXCWND;
874 if (rep->r_flags & R_SENT) {
875 rep->r_flags &= ~R_SENT;
876 nmp->nm_sent -= NFS_CWNDSCALE;
879 * Update rtt using a gain of 0.125 on the mean
880 * and a gain of 0.25 on the deviation.
882 if (rep->r_flags & R_TIMING) {
884 * Since the timer resolution of
885 * NFS_HZ is so course, it can often
886 * result in r_rtt == 0. Since
887 * r_rtt == N means that the actual
888 * rtt is between N+dt and N+2-dt ticks,
892 t1 -= (NFS_SRTT(rep) >> 3);
896 t1 -= (NFS_SDRTT(rep) >> 2);
897 NFS_SDRTT(rep) += t1;
899 nmp->nm_timeouts = 0;
904 * If not matched to a request, drop it.
905 * If it's mine, get out.
908 nfsstats.rpcunexpected++;
910 } else if (rep == myrep) {
911 if (rep->r_mrep == NULL)
912 panic("nfsreply nil");
915 if (myrep->r_flags & R_GETONEREP)
921 * nfs_request - goes something like this
922 * - fill in request struct
923 * - links it into list
924 * - calls nfs_send() for first transmit
925 * - calls nfs_receive() to get reply
926 * - break down rpc header and return with nfs reply pointed to
928 * nb: always frees up mreq mbuf list
931 nfs_request(vp, mrest, procnum, td, cred, mrp, mdp, dposp)
941 register struct mbuf *mrep, *m2;
942 register struct nfsreq *rep;
943 register u_int32_t *tl;
945 struct nfsmount *nmp;
946 struct mbuf *m, *md, *mheadend;
948 char nickv[RPCX_NICKVERF];
949 time_t reqtime, waituntil;
951 int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type;
952 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0;
953 int verf_len, verf_type;
956 char *auth_str, *verf_str;
957 NFSKERBKEY_T key; /* save session key */
959 /* Reject requests while attempting a forced unmount. */
960 if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
964 nmp = VFSTONFS(vp->v_mount);
965 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
969 rep->r_procnum = procnum;
979 * Get the RPC header with authorization.
982 verf_str = auth_str = (char *)0;
983 if (nmp->nm_flag & NFSMNT_KERB) {
985 verf_len = sizeof (nickv);
986 auth_type = RPCAUTH_KERB4;
987 bzero((caddr_t)key, sizeof (key));
988 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str,
989 &auth_len, verf_str, verf_len)) {
990 error = nfs_getauth(nmp, rep, cred, &auth_str,
991 &auth_len, verf_str, &verf_len, key);
993 free((caddr_t)rep, M_NFSREQ);
999 auth_type = RPCAUTH_UNIX;
1000 if (cred->cr_ngroups < 1)
1001 panic("nfsreq nogrps");
1002 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
1003 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
1006 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len,
1007 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid);
1009 free(auth_str, M_TEMP);
1012 * For stream protocols, insert a Sun RPC Record Mark.
1014 if (nmp->nm_sotype == SOCK_STREAM) {
1015 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
1016 *mtod(m, u_int32_t *) = htonl(0x80000000 |
1017 (m->m_pkthdr.len - NFSX_UNSIGNED));
1022 if (nmp->nm_flag & NFSMNT_SOFT)
1023 rep->r_retry = nmp->nm_retry;
1025 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */
1026 rep->r_rtt = rep->r_rexmit = 0;
1027 if (proct[procnum] > 0)
1028 rep->r_flags = R_TIMING;
1034 * Do the client side RPC.
1036 nfsstats.rpcrequests++;
1038 * Chain request into list of outstanding requests. Be sure
1039 * to put it LAST so timer finds oldest requests first.
1042 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
1044 /* Get send time for nqnfs */
1045 reqtime = time_second;
1048 * If backing off another request or avoiding congestion, don't
1049 * send this one now but let timer do it. If not timing a request,
1052 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
1053 (nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1054 nmp->nm_sent < nmp->nm_cwnd)) {
1056 if (nmp->nm_soflags & PR_CONNREQUIRED)
1057 error = nfs_sndlock(rep);
1059 m2 = m_copym(m, 0, M_COPYALL, M_WAIT);
1060 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
1061 if (nmp->nm_soflags & PR_CONNREQUIRED)
1064 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) {
1065 nmp->nm_sent += NFS_CWNDSCALE;
1066 rep->r_flags |= R_SENT;
1074 * Wait for the reply from our send or the timer's.
1076 if (!error || error == EPIPE)
1077 error = nfs_reply(rep);
1080 * RPC done, unlink the request.
1083 TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
1087 * Decrement the outstanding request count.
1089 if (rep->r_flags & R_SENT) {
1090 rep->r_flags &= ~R_SENT; /* paranoia */
1091 nmp->nm_sent -= NFS_CWNDSCALE;
1095 * If there was a successful reply and a tprintf msg.
1096 * tprintf a response.
1098 if (!error && (rep->r_flags & R_TPRINTFMSG))
1099 nfs_msg(rep->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
1105 m_freem(rep->r_mreq);
1106 free((caddr_t)rep, M_NFSREQ);
1111 * break down the rpc header and check if ok
1113 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1114 if (*tl++ == rpc_msgdenied) {
1115 if (*tl == rpc_mismatch)
1117 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
1120 mheadend->m_next = (struct mbuf *)0;
1122 m_freem(rep->r_mreq);
1129 m_freem(rep->r_mreq);
1130 free((caddr_t)rep, M_NFSREQ);
1135 * Grab any Kerberos verifier, otherwise just throw it away.
1137 verf_type = fxdr_unsigned(int, *tl++);
1138 i = fxdr_unsigned(int32_t, *tl);
1139 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1140 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep);
1144 nfsm_adv(nfsm_rndup(i));
1145 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1148 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1150 error = fxdr_unsigned(int, *tl);
1151 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1152 error == NFSERR_TRYLATER) {
1155 waituntil = time_second + trylater_delay;
1156 while (time_second < waituntil)
1157 (void) tsleep((caddr_t)&lbolt,
1158 PSOCK, "nqnfstry", 0);
1159 trylater_delay *= nfs_backoff[trylater_cnt];
1160 if (trylater_cnt < 7)
1166 * If the File Handle was stale, invalidate the
1167 * lookup cache, just in case.
1169 if (error == ESTALE)
1171 if (nmp->nm_flag & NFSMNT_NFSV3) {
1175 error |= NFSERR_RETERR;
1178 m_freem(rep->r_mreq);
1179 free((caddr_t)rep, M_NFSREQ);
1184 * For nqnfs, get any lease in reply
1186 if (nmp->nm_flag & NFSMNT_NQNFS) {
1187 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1190 nqlflag = fxdr_unsigned(int, *tl);
1191 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED);
1192 cachable = fxdr_unsigned(int, *tl++);
1193 reqtime += fxdr_unsigned(int, *tl++);
1194 if (reqtime > time_second) {
1195 frev = fxdr_hyper(tl);
1196 nqnfs_clientlease(nmp, np, nqlflag,
1197 cachable, reqtime, frev);
1204 m_freem(rep->r_mreq);
1205 FREE((caddr_t)rep, M_NFSREQ);
1209 error = EPROTONOSUPPORT;
1211 m_freem(rep->r_mreq);
1212 free((caddr_t)rep, M_NFSREQ);
1216 #ifndef NFS_NOSERVER
1218 * Generate the rpc reply header
1219 * siz arg. is used to decide if adding a cluster is worthwhile
1222 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp)
1224 struct nfsrv_descript *nd;
1225 struct nfssvc_sock *slp;
1233 register u_int32_t *tl;
1234 register struct mbuf *mreq;
1236 struct mbuf *mb, *mb2;
1238 MGETHDR(mreq, M_WAIT, MT_DATA);
1241 * If this is a big reply, use a cluster else
1242 * try and leave leading space for the lower level headers.
1244 siz += RPC_REPLYSIZ;
1245 if ((max_hdr + siz) >= MINCLSIZE) {
1246 MCLGET(mreq, M_WAIT);
1248 mreq->m_data += max_hdr;
1249 tl = mtod(mreq, u_int32_t *);
1250 mreq->m_len = 6 * NFSX_UNSIGNED;
1251 bpos = ((caddr_t)tl) + mreq->m_len;
1252 *tl++ = txdr_unsigned(nd->nd_retxid);
1254 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1255 *tl++ = rpc_msgdenied;
1256 if (err & NFSERR_AUTHERR) {
1257 *tl++ = rpc_autherr;
1258 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1259 mreq->m_len -= NFSX_UNSIGNED;
1260 bpos -= NFSX_UNSIGNED;
1262 *tl++ = rpc_mismatch;
1263 *tl++ = txdr_unsigned(RPC_VER2);
1264 *tl = txdr_unsigned(RPC_VER2);
1267 *tl++ = rpc_msgaccepted;
1270 * For Kerberos authentication, we must send the nickname
1271 * verifier back, otherwise just RPCAUTH_NULL.
1273 if (nd->nd_flag & ND_KERBFULL) {
1274 register struct nfsuid *nuidp;
1275 struct timeval ktvin, ktvout;
1277 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1278 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1279 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1280 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1281 &nuidp->nu_haddr, nd->nd_nam2)))
1286 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1288 txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1291 * Encrypt the timestamp in ecb mode using the
1298 *tl++ = rpc_auth_kerb;
1299 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1300 *tl = ktvout.tv_sec;
1301 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1302 *tl++ = ktvout.tv_usec;
1303 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1314 *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1317 *tl = txdr_unsigned(RPC_PROGMISMATCH);
1318 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1319 if (nd->nd_flag & ND_NQNFS) {
1320 *tl++ = txdr_unsigned(3);
1321 *tl = txdr_unsigned(3);
1323 *tl++ = txdr_unsigned(2);
1324 *tl = txdr_unsigned(3);
1328 *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1331 *tl = txdr_unsigned(RPC_GARBAGE);
1335 if (err != NFSERR_RETVOID) {
1336 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1338 *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1347 * For nqnfs, piggyback lease as requested.
1349 if ((nd->nd_flag & ND_NQNFS) && err == 0) {
1350 if (nd->nd_flag & ND_LEASE) {
1351 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1352 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE);
1353 *tl++ = txdr_unsigned(cache);
1354 *tl++ = txdr_unsigned(nd->nd_duration);
1355 txdr_hyper(*frev, tl);
1357 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1365 if (err != 0 && err != NFSERR_RETVOID)
1366 nfsstats.srvrpc_errs++;
1371 #endif /* NFS_NOSERVER */
1374 * Scan the nfsreq list and retranmit any requests that have timed out
1375 * To avoid retransmission attempts on STREAM sockets (in the future) make
1376 * sure to set the r_retry field to 0 (implies nm_retry == 0).
1380 void *arg; /* never used */
1382 register struct nfsreq *rep;
1383 register struct mbuf *m;
1384 register struct socket *so;
1385 register struct nfsmount *nmp;
1388 #ifndef NFS_NOSERVER
1389 static long lasttime = 0;
1390 register struct nfssvc_sock *slp;
1392 #endif /* NFS_NOSERVER */
1393 struct thread *td = &thread0; /* XXX for credentials, will break if sleep */
1396 for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) {
1398 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
1400 if (nfs_sigintr(nmp, rep, rep->r_td)) {
1404 if (rep->r_rtt >= 0) {
1406 if (nmp->nm_flag & NFSMNT_DUMBTIMR)
1407 timeo = nmp->nm_timeo;
1409 timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
1410 if (nmp->nm_timeouts > 0)
1411 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1412 if (rep->r_rtt <= timeo)
1414 if (nmp->nm_timeouts < 8)
1418 * Check for server not responding
1420 if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
1421 rep->r_rexmit > nmp->nm_deadthresh) {
1423 nmp->nm_mountp->mnt_stat.f_mntfromname,
1425 rep->r_flags |= R_TPRINTFMSG;
1427 if (rep->r_rexmit >= rep->r_retry) { /* too many */
1428 nfsstats.rpctimeouts++;
1432 if (nmp->nm_sotype != SOCK_DGRAM) {
1433 if (++rep->r_rexmit > NFS_MAXREXMIT)
1434 rep->r_rexmit = NFS_MAXREXMIT;
1437 if ((so = nmp->nm_so) == NULL)
1441 * If there is enough space and the window allows..
1443 * Set r_rtt to -1 in case we fail to send it now.
1446 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
1447 ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1448 (rep->r_flags & R_SENT) ||
1449 nmp->nm_sent < nmp->nm_cwnd) &&
1450 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){
1451 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
1452 error = (*so->so_proto->pr_usrreqs->pru_send)
1453 (so, 0, m, (struct sockaddr *)0,
1454 (struct mbuf *)0, td);
1456 error = (*so->so_proto->pr_usrreqs->pru_send)
1457 (so, 0, m, nmp->nm_nam, (struct mbuf *)0,
1460 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
1464 * Iff first send, start timing
1465 * else turn timing off, backoff timer
1466 * and divide congestion window by 2.
1468 if (rep->r_flags & R_SENT) {
1469 rep->r_flags &= ~R_TIMING;
1470 if (++rep->r_rexmit > NFS_MAXREXMIT)
1471 rep->r_rexmit = NFS_MAXREXMIT;
1473 if (nmp->nm_cwnd < NFS_CWNDSCALE)
1474 nmp->nm_cwnd = NFS_CWNDSCALE;
1475 nfsstats.rpcretries++;
1477 rep->r_flags |= R_SENT;
1478 nmp->nm_sent += NFS_CWNDSCALE;
1484 #ifndef NFS_NOSERVER
1486 * Call the nqnfs server timer once a second to handle leases.
1488 if (lasttime != time_second) {
1489 lasttime = time_second;
1494 * Scan the write gathering queues for writes that need to be
1497 cur_usec = nfs_curusec();
1498 for (slp = nfssvc_sockhead.tqh_first; slp != 0;
1499 slp = slp->ns_chain.tqe_next) {
1500 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec)
1501 nfsrv_wakenfsd(slp);
1503 #endif /* NFS_NOSERVER */
1505 nfs_timer_handle = timeout(nfs_timer, (void *)0, nfs_ticks);
1509 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1510 * wait for all requests to complete. This is used by forced unmounts
1511 * to terminate any outstanding RPCs.
1514 nfs_nmcancelreqs(nmp)
1515 struct nfsmount *nmp;
1521 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1522 if (nmp != req->r_nmp || req->r_mrep != NULL ||
1523 (req->r_flags & R_SOFTTERM))
1529 for (i = 0; i < 30; i++) {
1531 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1532 if (nmp == req->r_nmp)
1538 tsleep(&lbolt, PSOCK, "nfscancel", 0);
1544 * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
1545 * The nm_send count is decremented now to avoid deadlocks when the process in
1546 * soreceive() hasn't yet managed to send its own request.
1553 rep->r_flags |= R_SOFTTERM;
1555 if (rep->r_flags & R_SENT) {
1556 rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
1557 rep->r_flags &= ~R_SENT;
1562 * Test for a termination condition pending on the process.
1563 * This is used for NFSMNT_INT mounts.
1566 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
1571 if (rep && (rep->r_flags & R_SOFTTERM))
1573 /* Terminate all requests while attempting a forced unmount. */
1574 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
1576 if (!(nmp->nm_flag & NFSMNT_INT))
1579 if ((p = td->td_proc) == NULL)
1582 tmpset = p->p_siglist;
1583 SIGSETNAND(tmpset, p->p_sigmask);
1584 SIGSETNAND(tmpset, p->p_sigignore);
1585 if (SIGNOTEMPTY(p->p_siglist) && NFSINT_SIGMASK(tmpset))
1592 * Lock a socket against others.
1593 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
1594 * and also to avoid race conditions between the processes with nfs requests
1595 * in progress when a reconnect is necessary.
1598 nfs_sndlock(struct nfsreq *rep)
1600 int *statep = &rep->r_nmp->nm_state;
1602 int slpflag = 0, slptimeo = 0;
1605 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1607 while (*statep & NFSSTA_SNDLOCK) {
1608 if (nfs_sigintr(rep->r_nmp, rep, td))
1610 *statep |= NFSSTA_WANTSND;
1611 (void) tsleep((caddr_t)statep, slpflag | (PZERO - 1),
1612 "nfsndlck", slptimeo);
1613 if (slpflag == PCATCH) {
1618 /* Always fail if our request has been cancelled. */
1619 if ((rep->r_flags & R_SOFTTERM))
1621 *statep |= NFSSTA_SNDLOCK;
1626 * Unlock the stream socket for others.
1632 register int *statep = &rep->r_nmp->nm_state;
1634 if ((*statep & NFSSTA_SNDLOCK) == 0)
1635 panic("nfs sndunlock");
1636 *statep &= ~NFSSTA_SNDLOCK;
1637 if (*statep & NFSSTA_WANTSND) {
1638 *statep &= ~NFSSTA_WANTSND;
1639 wakeup((caddr_t)statep);
1645 register struct nfsreq *rep;
1647 register int *statep = &rep->r_nmp->nm_state;
1648 int slpflag, slptimeo = 0;
1650 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1654 while (*statep & NFSSTA_RCVLOCK) {
1655 if (nfs_sigintr(rep->r_nmp, rep, rep->r_td))
1657 *statep |= NFSSTA_WANTRCV;
1658 (void) tsleep((caddr_t)statep, slpflag | (PZERO - 1), "nfsrcvlk",
1661 * If our reply was recieved while we were sleeping,
1662 * then just return without taking the lock to avoid a
1663 * situation where a single iod could 'capture' the
1666 if (rep->r_mrep != NULL)
1668 if (slpflag == PCATCH) {
1673 *statep |= NFSSTA_RCVLOCK;
1678 * Unlock the stream socket for others.
1682 register struct nfsreq *rep;
1684 register int *statep = &rep->r_nmp->nm_state;
1686 if ((*statep & NFSSTA_RCVLOCK) == 0)
1687 panic("nfs rcvunlock");
1688 *statep &= ~NFSSTA_RCVLOCK;
1689 if (*statep & NFSSTA_WANTRCV) {
1690 *statep &= ~NFSSTA_WANTRCV;
1691 wakeup((caddr_t)statep);
1698 * Check for badly aligned mbuf data and realign by copying the unaligned
1699 * portion of the data into a new mbuf chain and freeing the portions
1700 * of the old chain that were replaced.
1702 * We cannot simply realign the data within the existing mbuf chain
1703 * because the underlying buffers may contain other rpc commands and
1704 * we cannot afford to overwrite them.
1706 * We would prefer to avoid this situation entirely. The situation does
1707 * not occur with NFS/UDP and is supposed to only occassionally occur
1708 * with TCP. Use vfs.nfs.realign_count and realign_test to check this.
1711 nfs_realign(pm, hsiz)
1712 register struct mbuf **pm;
1716 struct mbuf *n = NULL;
1721 while ((m = *pm) != NULL) {
1722 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
1723 MGET(n, M_WAIT, MT_DATA);
1724 if (m->m_len >= MINCLSIZE) {
1734 * If n is non-NULL, loop on m copying data, then replace the
1735 * portion of the chain that had to be realigned.
1738 ++nfs_realign_count;
1740 m_copyback(n, off, m->m_len, mtod(m, caddr_t));
1749 #ifndef NFS_NOSERVER
1752 * Parse an RPC request
1754 * - fill in the cred struct.
1757 nfs_getreq(nd, nfsd, has_header)
1758 register struct nfsrv_descript *nd;
1762 register int len, i;
1763 register u_int32_t *tl;
1764 register int32_t t1;
1767 caddr_t dpos, cp2, cp;
1768 u_int32_t nfsvers, auth_type;
1770 int error = 0, nqnfs = 0, ticklen;
1771 struct mbuf *mrep, *md;
1772 register struct nfsuid *nuidp;
1773 struct timeval tvin, tvout;
1774 #if 0 /* until encrypted keys are implemented */
1775 NFSKERBKEYSCHED_T keys; /* stores key schedule */
1782 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED);
1783 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++);
1784 if (*tl++ != rpc_call) {
1789 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED);
1792 if (*tl++ != rpc_vers) {
1793 nd->nd_repstat = ERPCMISMATCH;
1794 nd->nd_procnum = NFSPROC_NOOP;
1797 if (*tl != nfs_prog) {
1798 if (*tl == nqnfs_prog)
1801 nd->nd_repstat = EPROGUNAVAIL;
1802 nd->nd_procnum = NFSPROC_NOOP;
1807 nfsvers = fxdr_unsigned(u_int32_t, *tl++);
1808 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) ||
1809 (nfsvers != NQNFS_VER3 && nqnfs)) {
1810 nd->nd_repstat = EPROGMISMATCH;
1811 nd->nd_procnum = NFSPROC_NOOP;
1815 nd->nd_flag = (ND_NFSV3 | ND_NQNFS);
1816 else if (nfsvers == NFS_VER3)
1817 nd->nd_flag = ND_NFSV3;
1818 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++);
1819 if (nd->nd_procnum == NFSPROC_NULL)
1821 if (nd->nd_procnum >= NFS_NPROCS ||
1822 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) ||
1823 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) {
1824 nd->nd_repstat = EPROCUNAVAIL;
1825 nd->nd_procnum = NFSPROC_NOOP;
1828 if ((nd->nd_flag & ND_NFSV3) == 0)
1829 nd->nd_procnum = nfsv3_procid[nd->nd_procnum];
1831 len = fxdr_unsigned(int, *tl++);
1832 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1837 nd->nd_flag &= ~ND_KERBAUTH;
1839 * Handle auth_unix or auth_kerb.
1841 if (auth_type == rpc_auth_unix) {
1842 len = fxdr_unsigned(int, *++tl);
1843 if (len < 0 || len > NFS_MAXNAMLEN) {
1847 nfsm_adv(nfsm_rndup(len));
1848 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1849 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred));
1850 nd->nd_cr.cr_ref = 1;
1851 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
1852 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
1853 len = fxdr_unsigned(int, *tl);
1854 if (len < 0 || len > RPCAUTH_UNIXGIDS) {
1858 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED);
1859 for (i = 1; i <= len; i++)
1861 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
1864 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
1865 if (nd->nd_cr.cr_ngroups > 1)
1866 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups);
1867 len = fxdr_unsigned(int, *++tl);
1868 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1873 nfsm_adv(nfsm_rndup(len));
1874 } else if (auth_type == rpc_auth_kerb) {
1875 switch (fxdr_unsigned(int, *tl++)) {
1876 case RPCAKN_FULLNAME:
1877 ticklen = fxdr_unsigned(int, *tl);
1878 *((u_int32_t *)nfsd->nfsd_authstr) = *tl;
1879 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED;
1880 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED;
1881 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
1888 uio.uio_segflg = UIO_SYSSPACE;
1889 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4];
1890 iov.iov_len = RPCAUTH_MAXSIZ - 4;
1891 nfsm_mtouio(&uio, uio.uio_resid);
1892 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1893 if (*tl++ != rpc_auth_kerb ||
1894 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) {
1895 printf("Bad kerb verifier\n");
1896 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1897 nd->nd_procnum = NFSPROC_NOOP;
1900 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED);
1901 tl = (u_int32_t *)cp;
1902 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) {
1903 printf("Not fullname kerb verifier\n");
1904 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1905 nd->nd_procnum = NFSPROC_NOOP;
1908 cp += NFSX_UNSIGNED;
1909 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED);
1910 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED;
1911 nd->nd_flag |= ND_KERBFULL;
1912 nfsd->nfsd_flag |= NFSD_NEEDAUTH;
1914 case RPCAKN_NICKNAME:
1915 if (len != 2 * NFSX_UNSIGNED) {
1916 printf("Kerb nickname short\n");
1917 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED);
1918 nd->nd_procnum = NFSPROC_NOOP;
1921 nickuid = fxdr_unsigned(uid_t, *tl);
1922 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1923 if (*tl++ != rpc_auth_kerb ||
1924 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) {
1925 printf("Kerb nick verifier bad\n");
1926 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1927 nd->nd_procnum = NFSPROC_NOOP;
1930 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1931 tvin.tv_sec = *tl++;
1934 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first;
1935 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1936 if (nuidp->nu_cr.cr_uid == nickuid &&
1938 netaddr_match(NU_NETFAM(nuidp),
1939 &nuidp->nu_haddr, nd->nd_nam2)))
1944 (NFSERR_AUTHERR|AUTH_REJECTCRED);
1945 nd->nd_procnum = NFSPROC_NOOP;
1950 * Now, decrypt the timestamp using the session key
1957 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec);
1958 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec);
1959 if (nuidp->nu_expire < time_second ||
1960 nuidp->nu_timestamp.tv_sec > tvout.tv_sec ||
1961 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec &&
1962 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) {
1963 nuidp->nu_expire = 0;
1965 (NFSERR_AUTHERR|AUTH_REJECTVERF);
1966 nd->nd_procnum = NFSPROC_NOOP;
1969 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr);
1970 nd->nd_flag |= ND_KERBNICK;
1973 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED);
1974 nd->nd_procnum = NFSPROC_NOOP;
1979 * For nqnfs, get piggybacked lease request.
1981 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) {
1982 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1983 nd->nd_flag |= fxdr_unsigned(int, *tl);
1984 if (nd->nd_flag & ND_LEASE) {
1985 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1986 nd->nd_duration = fxdr_unsigned(int32_t, *tl);
1988 nd->nd_duration = NQ_MINLEASE;
1990 nd->nd_duration = NQ_MINLEASE;
2001 * Send a message to the originating process's terminal. The thread and/or
2002 * process may be NULL. YYY the thread should not be NULL but there may
2003 * still be some uio_td's that are still being passed as NULL through to
2007 nfs_msg(struct thread *td, char *server, char *msg)
2011 if (td && td->td_proc)
2012 tpr = tprintf_open(td->td_proc);
2015 tprintf(tpr, "nfs server %s: %s\n", server, msg);
2020 #ifndef NFS_NOSERVER
2022 * Socket upcall routine for the nfsd sockets.
2023 * The caddr_t arg is a pointer to the "struct nfssvc_sock".
2024 * Essentially do as much as possible non-blocking, else punt and it will
2025 * be called with M_WAIT from an nfsd.
2028 nfsrv_rcv(so, arg, waitflag)
2033 register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
2034 register struct mbuf *m;
2036 struct sockaddr *nam;
2040 if ((slp->ns_flag & SLP_VALID) == 0)
2044 * Define this to test for nfsds handling this under heavy load.
2046 if (waitflag == M_DONTWAIT) {
2047 slp->ns_flag |= SLP_NEEDQ; goto dorecs;
2051 if (so->so_type == SOCK_STREAM) {
2053 * If there are already records on the queue, defer soreceive()
2054 * to an nfsd so that there is feedback to the TCP layer that
2055 * the nfs servers are heavily loaded.
2057 if (STAILQ_FIRST(&slp->ns_rec) && waitflag == M_DONTWAIT) {
2058 slp->ns_flag |= SLP_NEEDQ;
2065 auio.uio_resid = 1000000000;
2066 flags = MSG_DONTWAIT;
2067 error = so->so_proto->pr_usrreqs->pru_soreceive
2068 (so, &nam, &auio, &mp, (struct mbuf **)0, &flags);
2069 if (error || mp == (struct mbuf *)0) {
2070 if (error == EWOULDBLOCK)
2071 slp->ns_flag |= SLP_NEEDQ;
2073 slp->ns_flag |= SLP_DISCONN;
2077 if (slp->ns_rawend) {
2078 slp->ns_rawend->m_next = m;
2079 slp->ns_cc += 1000000000 - auio.uio_resid;
2082 slp->ns_cc = 1000000000 - auio.uio_resid;
2089 * Now try and parse record(s) out of the raw stream data.
2091 error = nfsrv_getstream(slp, waitflag);
2094 slp->ns_flag |= SLP_DISCONN;
2096 slp->ns_flag |= SLP_NEEDQ;
2100 auio.uio_resid = 1000000000;
2101 flags = MSG_DONTWAIT;
2102 error = so->so_proto->pr_usrreqs->pru_soreceive
2103 (so, &nam, &auio, &mp,
2104 (struct mbuf **)0, &flags);
2106 struct nfsrv_rec *rec;
2107 rec = malloc(sizeof(struct nfsrv_rec),
2108 M_NFSRVDESC, waitflag);
2111 FREE(nam, M_SONAME);
2115 nfs_realign(&mp, 10 * NFSX_UNSIGNED);
2116 rec->nr_address = nam;
2117 rec->nr_packet = mp;
2118 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2121 if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
2122 && error != EWOULDBLOCK) {
2123 slp->ns_flag |= SLP_DISCONN;
2131 * Now try and process the request records, non-blocking.
2134 if (waitflag == M_DONTWAIT &&
2135 (STAILQ_FIRST(&slp->ns_rec)
2136 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN))))
2137 nfsrv_wakenfsd(slp);
2141 * Try and extract an RPC request from the mbuf data list received on a
2142 * stream socket. The "waitflag" argument indicates whether or not it
2146 nfsrv_getstream(slp, waitflag)
2147 register struct nfssvc_sock *slp;
2150 register struct mbuf *m, **mpp;
2151 register char *cp1, *cp2;
2153 struct mbuf *om, *m2, *recm;
2156 if (slp->ns_flag & SLP_GETSTREAM)
2157 panic("nfs getstream");
2158 slp->ns_flag |= SLP_GETSTREAM;
2160 if (slp->ns_reclen == 0) {
2161 if (slp->ns_cc < NFSX_UNSIGNED) {
2162 slp->ns_flag &= ~SLP_GETSTREAM;
2166 if (m->m_len >= NFSX_UNSIGNED) {
2167 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
2168 m->m_data += NFSX_UNSIGNED;
2169 m->m_len -= NFSX_UNSIGNED;
2171 cp1 = (caddr_t)&recmark;
2172 cp2 = mtod(m, caddr_t);
2173 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
2174 while (m->m_len == 0) {
2176 cp2 = mtod(m, caddr_t);
2183 slp->ns_cc -= NFSX_UNSIGNED;
2184 recmark = ntohl(recmark);
2185 slp->ns_reclen = recmark & ~0x80000000;
2186 if (recmark & 0x80000000)
2187 slp->ns_flag |= SLP_LASTFRAG;
2189 slp->ns_flag &= ~SLP_LASTFRAG;
2190 if (slp->ns_reclen > NFS_MAXPACKET) {
2191 slp->ns_flag &= ~SLP_GETSTREAM;
2197 * Now get the record part.
2199 * Note that slp->ns_reclen may be 0. Linux sometimes
2200 * generates 0-length RPCs
2203 if (slp->ns_cc == slp->ns_reclen) {
2205 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0;
2206 slp->ns_cc = slp->ns_reclen = 0;
2207 } else if (slp->ns_cc > slp->ns_reclen) {
2210 om = (struct mbuf *)0;
2212 while (len < slp->ns_reclen) {
2213 if ((len + m->m_len) > slp->ns_reclen) {
2214 m2 = m_copym(m, 0, slp->ns_reclen - len,
2222 m->m_data += slp->ns_reclen - len;
2223 m->m_len -= slp->ns_reclen - len;
2224 len = slp->ns_reclen;
2226 slp->ns_flag &= ~SLP_GETSTREAM;
2227 return (EWOULDBLOCK);
2229 } else if ((len + m->m_len) == slp->ns_reclen) {
2234 om->m_next = (struct mbuf *)0;
2245 slp->ns_flag &= ~SLP_GETSTREAM;
2250 * Accumulate the fragments into a record.
2252 mpp = &slp->ns_frag;
2254 mpp = &((*mpp)->m_next);
2256 if (slp->ns_flag & SLP_LASTFRAG) {
2257 struct nfsrv_rec *rec;
2258 rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, waitflag);
2260 m_freem(slp->ns_frag);
2262 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED);
2263 rec->nr_address = (struct sockaddr *)0;
2264 rec->nr_packet = slp->ns_frag;
2265 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2267 slp->ns_frag = (struct mbuf *)0;
2273 * Parse an RPC header.
2276 nfsrv_dorec(slp, nfsd, ndp)
2277 register struct nfssvc_sock *slp;
2279 struct nfsrv_descript **ndp;
2281 struct nfsrv_rec *rec;
2282 register struct mbuf *m;
2283 struct sockaddr *nam;
2284 register struct nfsrv_descript *nd;
2288 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec))
2290 rec = STAILQ_FIRST(&slp->ns_rec);
2291 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
2292 nam = rec->nr_address;
2294 free(rec, M_NFSRVDESC);
2295 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
2296 M_NFSRVDESC, M_WAITOK);
2297 nd->nd_md = nd->nd_mrep = m;
2299 nd->nd_dpos = mtod(m, caddr_t);
2300 error = nfs_getreq(nd, nfsd, TRUE);
2303 FREE(nam, M_SONAME);
2305 free((caddr_t)nd, M_NFSRVDESC);
2314 * Search for a sleeping nfsd and wake it up.
2315 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the
2316 * running nfsds will go look for the work in the nfssvc_sock list.
2320 struct nfssvc_sock *slp;
2322 register struct nfsd *nd;
2324 if ((slp->ns_flag & SLP_VALID) == 0)
2326 for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) {
2327 if (nd->nfsd_flag & NFSD_WAITING) {
2328 nd->nfsd_flag &= ~NFSD_WAITING;
2330 panic("nfsd wakeup");
2333 wakeup((caddr_t)nd);
2337 slp->ns_flag |= SLP_DOREC;
2338 nfsd_head_flag |= NFSD_CHECKSLP;
2340 #endif /* NFS_NOSERVER */