/* * Copyright (c) 1989, 1991, 1993, 1995 * 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 8.5 (Berkeley) 3/30/95 * $FreeBSD: src/sys/nfs/nfs_socket.c,v 1.60.2.6 2003/03/26 01:44:46 alfred Exp $ * $DragonFly: src/sys/vfs/nfs/nfs_socket.c,v 1.34 2006/04/25 22:11:31 dillon Exp $ */ /* * Socket operations for use by nfs */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "rpcv2.h" #include "nfsproto.h" #include "nfs.h" #include "xdr_subs.h" #include "nfsm_subs.h" #include "nfsmount.h" #include "nfsnode.h" #include "nfsrtt.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_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr, rpc_auth_kerb; extern u_int32_t nfs_prog; extern struct nfsstats nfsstats; extern int nfsv3_procid[NFS_NPROCS]; extern int nfs_ticks; /* * 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, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, }; static int nfs_realign_test; static int nfs_realign_count; static int nfs_bufpackets = 4; static int nfs_timer_raced; SYSCTL_DECL(_vfs_nfs); SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, ""); SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, ""); SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 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 nfsrtton = 0; struct nfsrtt nfsrtt; struct callout nfs_timer_handle; static int nfs_msg (struct thread *,char *,char *); static int nfs_rcvlock (struct nfsreq *); static void nfs_rcvunlock (struct nfsreq *); static void nfs_realign (struct mbuf **pm, int hsiz); static int nfs_receive (struct nfsreq *rep, struct sockaddr **aname, struct mbuf **mp); static void nfs_softterm (struct nfsreq *rep); static int nfs_reconnect (struct nfsreq *rep); #ifndef NFS_NOSERVER static int nfsrv_getstream (struct nfssvc_sock *, int, int *); int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd, struct nfssvc_sock *slp, struct thread *td, struct mbuf **mreqp) = { nfsrv_null, nfsrv_getattr, nfsrv_setattr, nfsrv_lookup, nfsrv3_access, nfsrv_readlink, nfsrv_read, nfsrv_write, nfsrv_create, nfsrv_mkdir, nfsrv_symlink, nfsrv_mknod, nfsrv_remove, nfsrv_rmdir, nfsrv_rename, nfsrv_link, nfsrv_readdir, nfsrv_readdirplus, nfsrv_statfs, nfsrv_fsinfo, nfsrv_pathconf, nfsrv_commit, nfsrv_noop, nfsrv_noop, nfsrv_noop, nfsrv_noop }; #endif /* NFS_NOSERVER */ /* * Initialize sockets and congestion for a new NFS connection. * We do not free the sockaddr if error. */ int nfs_connect(struct nfsmount *nmp, struct nfsreq *rep) { struct socket *so; int error, rcvreserve, sndreserve; int pktscale; struct sockaddr *saddr; struct sockaddr_in *sin; struct thread *td = &thread0; /* only used for socreate and sobind */ nmp->nm_so = (struct socket *)0; saddr = nmp->nm_nam; error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, nmp->nm_soproto, td); if (error) 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)) { struct sockopt sopt; int ip; struct sockaddr_in ssin; bzero(&sopt, sizeof sopt); ip = IP_PORTRANGE_LOW; sopt.sopt_level = IPPROTO_IP; sopt.sopt_name = IP_PORTRANGE; sopt.sopt_val = (void *)&ip; sopt.sopt_valsize = sizeof(ip); sopt.sopt_td = NULL; error = sosetopt(so, &sopt); if (error) goto bad; bzero(&ssin, sizeof ssin); sin = &ssin; sin->sin_len = sizeof (struct sockaddr_in); sin->sin_family = AF_INET; sin->sin_addr.s_addr = INADDR_ANY; sin->sin_port = htons(0); error = sobind(so, (struct sockaddr *)sin, td); if (error) goto bad; bzero(&sopt, sizeof sopt); ip = IP_PORTRANGE_DEFAULT; sopt.sopt_level = IPPROTO_IP; sopt.sopt_name = IP_PORTRANGE; sopt.sopt_val = (void *)&ip; sopt.sopt_valsize = sizeof(ip); sopt.sopt_td = NULL; error = sosetopt(so, &sopt); 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 { error = soconnect(so, nmp->nm_nam, td); if (error) 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. */ crit_enter(); while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { (void) tsleep((caddr_t)&so->so_timeo, 0, "nfscon", 2 * hz); if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0 && rep && (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){ so->so_state &= ~SS_ISCONNECTING; crit_exit(); goto bad; } } if (so->so_error) { error = so->so_error; so->so_error = 0; crit_exit(); goto bad; } crit_exit(); } so->so_rcv.sb_timeo = (5 * hz); so->so_snd.sb_timeo = (5 * hz); /* * Get buffer reservation size from sysctl, but impose reasonable * limits. */ pktscale = nfs_bufpackets; if (pktscale < 2) pktscale = 2; if (pktscale > 64) pktscale = 64; if (nmp->nm_sotype == SOCK_DGRAM) { sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale; rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + NFS_MAXPKTHDR) * pktscale; } else if (nmp->nm_sotype == SOCK_SEQPACKET) { sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale; rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + NFS_MAXPKTHDR) * pktscale; } else { if (nmp->nm_sotype != SOCK_STREAM) panic("nfscon sotype"); if (so->so_proto->pr_flags & PR_CONNREQUIRED) { struct sockopt sopt; int val; bzero(&sopt, sizeof sopt); sopt.sopt_level = SOL_SOCKET; sopt.sopt_name = SO_KEEPALIVE; sopt.sopt_val = &val; sopt.sopt_valsize = sizeof val; val = 1; sosetopt(so, &sopt); } if (so->so_proto->pr_protocol == IPPROTO_TCP) { struct sockopt sopt; int val; bzero(&sopt, sizeof sopt); sopt.sopt_level = IPPROTO_TCP; sopt.sopt_name = TCP_NODELAY; sopt.sopt_val = &val; sopt.sopt_valsize = sizeof val; val = 1; sosetopt(so, &sopt); } sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + sizeof (u_int32_t)) * pktscale; rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + sizeof (u_int32_t)) * pktscale; } error = soreserve(so, sndreserve, rcvreserve, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]); if (error) 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] = (NFS_TIMEO << 3); nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = nmp->nm_sdrtt[3] = 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. */ static int nfs_reconnect(struct nfsreq *rep) { struct nfsreq *rp; struct nfsmount *nmp = rep->r_nmp; int error; nfs_disconnect(nmp); while ((error = nfs_connect(nmp, rep)) != 0) { if (error == EINTR || error == ERESTART) return (EINTR); (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); } /* * Loop through outstanding request list and fix up all requests * on old socket. */ crit_enter(); TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { if (rp->r_nmp == nmp) rp->r_flags |= R_MUSTRESEND; } crit_exit(); return (0); } /* * NFS disconnect. Clean up and unlink. */ void nfs_disconnect(struct nfsmount *nmp) { struct socket *so; if (nmp->nm_so) { so = nmp->nm_so; nmp->nm_so = (struct socket *)0; soshutdown(so, 2); soclose(so); } } void nfs_safedisconnect(struct nfsmount *nmp) { struct nfsreq dummyreq; bzero(&dummyreq, sizeof(dummyreq)); dummyreq.r_nmp = nmp; dummyreq.r_td = NULL; nfs_rcvlock(&dummyreq); nfs_disconnect(nmp); nfs_rcvunlock(&dummyreq); } /* * 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 (?) */ int nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top, struct nfsreq *rep) { struct sockaddr *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 sockaddr *)0; else sendnam = nam; if (so->so_type == SOCK_SEQPACKET) flags = MSG_EOR; else flags = 0; error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags, curthread /*XXX*/); /* * ENOBUFS for dgram sockets is transient and non fatal. * No need to log, and no need to break a soft mount. */ if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { error = 0; if (rep) /* do backoff retransmit on client */ rep->r_flags |= R_MUSTRESEND; } 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. */ static int nfs_receive(struct nfsreq *rep, struct sockaddr **aname, struct mbuf **mp) { struct socket *so; struct uio auio; struct iovec aio; struct mbuf *m; struct mbuf *control; u_int32_t len; struct sockaddr **getnam; int error, sotype, rcvflg; struct thread *td = curthread; /* XXX */ /* * Set up arguments for soreceive() */ *mp = (struct mbuf *)0; *aname = (struct sockaddr *)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) { error = nfs_sndlock(rep); if (error) 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); return (EINTR); } so = rep->r_nmp->nm_so; if (!so) { error = nfs_reconnect(rep); if (error) { nfs_sndunlock(rep); return (error); } goto tryagain; } while (rep->r_flags & R_MUSTRESEND) { m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT); nfsstats.rpcretries++; error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); if (error) { if (error == EINTR || error == ERESTART || (error = nfs_reconnect(rep)) != 0) { nfs_sndunlock(rep); return (error); } goto tryagain; } } nfs_sndunlock(rep); if (sotype == SOCK_STREAM) { aio.iov_base = (caddr_t) &len; aio.iov_len = sizeof(u_int32_t); 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_int32_t); auio.uio_td = td; do { rcvflg = MSG_WAITALL; error = so_pru_soreceive(so, NULL, &auio, NULL, NULL, &rcvflg); if (error == EWOULDBLOCK && rep) { if (rep->r_flags & R_SOFTTERM) return (EINTR); } } while (error == EWOULDBLOCK); if (!error && auio.uio_resid > 0) { /* * Don't log a 0 byte receive; it means * that the socket has been closed, and * can happen during normal operation * (forcible unmount or Solaris server). */ if (auio.uio_resid != sizeof (u_int32_t)) log(LOG_INFO, "short receive (%d/%d) from nfs server %s\n", (int)(sizeof(u_int32_t) - auio.uio_resid), (int)sizeof(u_int32_t), 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 = so_pru_soreceive(so, NULL, &auio, mp, NULL, &rcvflg); } while (error == EWOULDBLOCK || error == EINTR || error == ERESTART); if (!error && auio.uio_resid > 0) { if (len != auio.uio_resid) 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_td = td; do { rcvflg = 0; error = so_pru_soreceive(so, NULL, &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); if (!error) { error = nfs_reconnect(rep); if (!error) goto tryagain; else nfs_sndunlock(rep); } } } else { if ((so = rep->r_nmp->nm_so) == NULL) return (EACCES); if (so->so_state & SS_ISCONNECTED) getnam = (struct sockaddr **)0; else getnam = aname; auio.uio_resid = len = 1000000; auio.uio_td = td; do { rcvflg = 0; error = so_pru_soreceive(so, getnam, &auio, mp, NULL, &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 */ int nfs_reply(struct nfsreq *myrep) { struct nfsreq *rep; struct nfsmount *nmp = myrep->r_nmp; int32_t t1; struct mbuf *mrep, *md; struct sockaddr *nam; u_int32_t 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 nfs_rcvlock() returns EALREADY, that means that * the reply has already been recieved by another * process and we can return immediately. In this * case, the lock is not taken to avoid races with * other processes. */ error = nfs_rcvlock(myrep); if (error == EALREADY) return (0); if (error) return (error); /* * Get the next Rpc reply off the socket */ error = nfs_receive(myrep, &nam, &mrep); nfs_rcvunlock(myrep); 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) FREE(nam, M_SONAME); /* * Get the xid and check that it is an rpc reply */ md = mrep; dpos = mtod(md, caddr_t); nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); rxid = *tl++; if (*tl != rpc_reply) { 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. On match, set * r_mrep atomically to prevent the timer from messing * around with the request after we have exited the critical * section. */ crit_enter(); TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { if (rep->r_mrep == NULL && rxid == rep->r_xid) { rep->r_mrep = mrep; break; } } crit_exit(); /* * Fill in the rest of the reply if we found a match. */ if (rep) { 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; getmicrotime(&rt->tstamp); 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; } crit_enter(); /* nfs_timer interlock for nm_sent */ if (rep->r_flags & R_SENT) { rep->r_flags &= ~R_SENT; nmp->nm_sent -= NFS_CWNDSCALE; } crit_exit(); /* * 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; } /* * If not matched to a request, drop it. * If it's mine, get out. */ if (rep == NULL) { 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 */ int nfs_request(struct vnode *vp, struct mbuf *mrest, int procnum, struct thread *td, struct ucred *cred, struct mbuf **mrp, struct mbuf **mdp, caddr_t *dposp) { struct mbuf *mrep, *m2; struct nfsreq *rep; u_int32_t *tl; int i; struct nfsmount *nmp; struct mbuf *m, *md, *mheadend; char nickv[RPCX_NICKVERF]; time_t waituntil; caddr_t dpos, cp2; int t1, error = 0, mrest_len, auth_len, auth_type; int trylater_delay = 15, trylater_cnt = 0, failed_auth = 0; int verf_len, verf_type; u_int32_t xid; char *auth_str, *verf_str; NFSKERBKEY_T key; /* save session key */ /* Reject requests while attempting a forced unmount. */ if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) { m_freem(mrest); return (ESTALE); } 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_td = td; rep->r_procnum = procnum; rep->r_mreq = NULL; i = 0; m = mrest; while (m) { i += m->m_len; m = m->m_next; } mrest_len = i; /* * Get the RPC header with authorization. */ kerbauth: verf_str = auth_str = (char *)0; if (nmp->nm_flag & NFSMNT_KERB) { verf_str = nickv; verf_len = sizeof (nickv); auth_type = RPCAUTH_KERB4; bzero((caddr_t)key, sizeof (key)); if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, &auth_len, verf_str, verf_len)) { error = nfs_getauth(nmp, rep, cred, &auth_str, &auth_len, verf_str, &verf_len, key); if (error) { free((caddr_t)rep, M_NFSREQ); m_freem(mrest); return (error); } } } 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, procnum, auth_type, auth_len, auth_str, verf_len, verf_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, MB_WAIT); if (m == NULL) { free(rep, M_NFSREQ); return (ENOBUFS); } *mtod(m, u_int32_t *) = 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 | R_MASKTIMER; else rep->r_flags = R_MASKTIMER; 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. Note * that R_MASKTIMER is set at the moment to prevent any timer * action on this request while we are still doing processing on * it below. splsoftclock() primarily protects nm_sent. Note * that we may block in this code so there is no atomicy guarentee. */ crit_enter(); TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); /* * 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. * * Even though the timer will not mess with our request there is * still the possibility that we will race a reply (which clears * R_SENT), especially on localhost connections, so be very careful * when setting R_SENT. We could set R_SENT prior to calling * nfs_send() but why bother if the response occurs that quickly? */ if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || (nmp->nm_flag & NFSMNT_DUMBTIMR) || nmp->nm_sent < nmp->nm_cwnd)) { if (nmp->nm_soflags & PR_CONNREQUIRED) error = nfs_sndlock(rep); if (!error) { m2 = m_copym(m, 0, M_COPYALL, MB_WAIT); error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep); if (nmp->nm_soflags & PR_CONNREQUIRED) nfs_sndunlock(rep); } if (!error && (rep->r_flags & R_MUSTRESEND) == 0 && rep->r_mrep == NULL) { KASSERT((rep->r_flags & R_SENT) == 0, ("R_SENT ASSERT %p", rep)); nmp->nm_sent += NFS_CWNDSCALE; rep->r_flags |= R_SENT; } } else { rep->r_rtt = -1; } /* * Let the timer do what it will with the request, then * wait for the reply from our send or the timer's. */ if (!error || error == EPIPE) { rep->r_flags &= ~R_MASKTIMER; crit_exit(); error = nfs_reply(rep); crit_enter(); } /* * RPC done, unlink the request, but don't rip it out from under * the callout timer. */ while (rep->r_flags & R_LOCKED) { nfs_timer_raced = 1; tsleep(&nfs_timer_raced, 0, "nfstrac", 0); } TAILQ_REMOVE(&nfs_reqq, rep, r_chain); /* * Decrement the outstanding request count. */ if (rep->r_flags & R_SENT) { rep->r_flags &= ~R_SENT; nmp->nm_sent -= NFS_CWNDSCALE; } crit_exit(); /* * If there was a successful reply and a tprintf msg. * tprintf a response. */ if (!error && (rep->r_flags & R_TPRINTFMSG)) nfs_msg(rep->r_td, 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_int32_t *, 3 * NFSX_UNSIGNED); if (*tl++ == rpc_msgdenied) { if (*tl == rpc_mismatch) error = EOPNOTSUPP; else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { if (!failed_auth) { 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); } /* * Grab any Kerberos verifier, otherwise just throw it away. */ verf_type = fxdr_unsigned(int, *tl++); i = fxdr_unsigned(int32_t, *tl); if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); if (error) goto nfsmout; } else if (i > 0) nfsm_adv(nfsm_rndup(i)); nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); /* 0 == ok */ if (*tl == 0) { nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); if (*tl != 0) { error = fxdr_unsigned(int, *tl); if ((nmp->nm_flag & NFSMNT_NFSV3) && error == NFSERR_TRYLATER) { m_freem(mrep); error = 0; waituntil = time_second + trylater_delay; while (time_second < waituntil) (void) tsleep((caddr_t)&lbolt, 0, "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_inval_vp(vp, CINV_CHILDREN); } if (nmp->nm_flag & NFSMNT_NFSV3) { *mrp = mrep; *mdp = md; *dposp = dpos; error |= NFSERR_RETERR; } else m_freem(mrep); m_freem(rep->r_mreq); free((caddr_t)rep, M_NFSREQ); return (error); } *mrp = mrep; *mdp = md; *dposp = dpos; m_freem(rep->r_mreq); FREE((caddr_t)rep, M_NFSREQ); return (0); } m_freem(mrep); error = EPROTONOSUPPORT; nfsmout: m_freem(rep->r_mreq); free((caddr_t)rep, M_NFSREQ); return (error); } #ifndef NFS_NOSERVER /* * Generate the rpc reply header * siz arg. is used to decide if adding a cluster is worthwhile */ int nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp, int err, struct mbuf **mrq, struct mbuf **mbp, caddr_t *bposp) { u_int32_t *tl; struct mbuf *mreq; caddr_t bpos; struct mbuf *mb, *mb2; siz += RPC_REPLYSIZ; mb = mreq = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL); mreq->m_pkthdr.len = 0; /* * If this is not a cluster, try and leave leading space * for the lower level headers. */ if ((max_hdr + siz) < MINCLSIZE) mreq->m_data += max_hdr; tl = mtod(mreq, u_int32_t *); mreq->m_len = 6 * NFSX_UNSIGNED; bpos = ((caddr_t)tl) + mreq->m_len; *tl++ = txdr_unsigned(nd->nd_retxid); *tl++ = rpc_reply; if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { *tl++ = rpc_msgdenied; if (err & NFSERR_AUTHERR) { *tl++ = rpc_autherr; *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); mreq->m_len -= NFSX_UNSIGNED; bpos -= NFSX_UNSIGNED; } else { *tl++ = rpc_mismatch; *tl++ = txdr_unsigned(RPC_VER2); *tl = txdr_unsigned(RPC_VER2); } } else { *tl++ = rpc_msgaccepted; /* * For Kerberos authentication, we must send the nickname * verifier back, otherwise just RPCAUTH_NULL. */ if (nd->nd_flag & ND_KERBFULL) { struct nfsuid *nuidp; struct timeval ktvin, ktvout; for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; nuidp != 0; nuidp = nuidp->nu_hash.le_next) { if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), &nuidp->nu_haddr, nd->nd_nam2))) break; } if (nuidp) { ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec); /* * Encrypt the timestamp in ecb mode using the * session key. */ #ifdef NFSKERB XXX #endif *tl++ = rpc_auth_kerb; *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); *tl = ktvout.tv_sec; nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); *tl++ = ktvout.tv_usec; *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); } else { *tl++ = 0; *tl++ = 0; } } else { *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_int32_t *, 2 * NFSX_UNSIGNED); *tl++ = txdr_unsigned(2); *tl = txdr_unsigned(3); break; case EPROCUNAVAIL: *tl = txdr_unsigned(RPC_PROCUNAVAIL); break; case EBADRPC: *tl = txdr_unsigned(RPC_GARBAGE); break; default: *tl = 0; if (err != NFSERR_RETVOID) { nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); if (err) *tl = txdr_unsigned(nfsrv_errmap(nd, err)); else *tl = 0; } break; }; } if (mrq != NULL) *mrq = mreq; *mbp = mb; *bposp = bpos; if (err != 0 && err != NFSERR_RETVOID) nfsstats.srvrpc_errs++; return (0); } #endif /* NFS_NOSERVER */ /* * 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(void *arg /* never used */) { struct nfsreq *rep; struct mbuf *m; struct socket *so; struct nfsmount *nmp; int timeo; int error; #ifndef NFS_NOSERVER struct nfssvc_sock *slp; u_quad_t cur_usec; #endif /* NFS_NOSERVER */ struct thread *td = &thread0; /* XXX for credentials, will break if sleep */ crit_enter(); TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { nmp = rep->r_nmp; if (rep->r_mrep || (rep->r_flags & (R_SOFTTERM|R_MASKTIMER))) continue; rep->r_flags |= R_LOCKED; if (nfs_sigintr(nmp, rep, rep->r_td)) { nfs_softterm(rep); goto skip; } 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) goto skip; 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_td, 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++; nfs_softterm(rep); goto skip; } if (nmp->nm_sotype != SOCK_DGRAM) { if (++rep->r_rexmit > NFS_MAXREXMIT) rep->r_rexmit = NFS_MAXREXMIT; goto skip; } if ((so = nmp->nm_so) == NULL) goto skip; /* * 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, MB_DONTWAIT))){ if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) error = so_pru_send(so, 0, m, (struct sockaddr *)0, (struct mbuf *)0, td); else error = so_pru_send(so, 0, m, nmp->nm_nam, (struct mbuf *)0, td); if (error) { if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) so->so_error = 0; } else if (rep->r_mrep == NULL) { /* * Iff first send, start timing * else turn timing off, backoff timer * and divide congestion window by 2. * * It is possible for the so_pru_send() to * block and for us to race a reply so we * only do this if the reply field has not * been filled in. R_LOCKED will prevent * the request from being ripped out from under * us entirely. */ 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; } } skip: rep->r_flags &= ~R_LOCKED; } #ifndef NFS_NOSERVER /* * Scan the write gathering queues for writes that need to be * completed now. */ cur_usec = nfs_curusec(); TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec) nfsrv_wakenfsd(slp, 1); } #endif /* NFS_NOSERVER */ /* * Due to possible blocking, a client operation may be waiting for * us to finish processing this request so it can remove it. */ if (nfs_timer_raced) { nfs_timer_raced = 0; wakeup(&nfs_timer_raced); } crit_exit(); callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer, NULL); } /* * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and * wait for all requests to complete. This is used by forced unmounts * to terminate any outstanding RPCs. */ int nfs_nmcancelreqs(struct nfsmount *nmp) { struct nfsreq *req; int i; crit_enter(); TAILQ_FOREACH(req, &nfs_reqq, r_chain) { if (nmp != req->r_nmp || req->r_mrep != NULL || (req->r_flags & R_SOFTTERM)) { continue; } nfs_softterm(req); } crit_exit(); for (i = 0; i < 30; i++) { crit_enter(); TAILQ_FOREACH(req, &nfs_reqq, r_chain) { if (nmp == req->r_nmp) break; } crit_exit(); if (req == NULL) return (0); tsleep(&lbolt, 0, "nfscancel", 0); } return (EBUSY); } /* * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT). * The nm_send count is decremented now to avoid deadlocks when the process in * soreceive() hasn't yet managed to send its own request. * * This routine must be called at splsoftclock() to protect r_flags and * nm_sent. */ static void nfs_softterm(struct nfsreq *rep) { rep->r_flags |= R_SOFTTERM; if (rep->r_flags & R_SENT) { rep->r_nmp->nm_sent -= NFS_CWNDSCALE; rep->r_flags &= ~R_SENT; } } /* * Test for a termination condition pending on the process. * This is used for NFSMNT_INT mounts. */ int nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td) { sigset_t tmpset; struct proc *p; if (rep && (rep->r_flags & R_SOFTTERM)) return (EINTR); /* Terminate all requests while attempting a forced unmount. */ if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) return (EINTR); if (!(nmp->nm_flag & NFSMNT_INT)) return (0); /* td might be NULL YYY */ if (td == NULL || (p = td->td_proc) == NULL) return (0); tmpset = p->p_siglist; SIGSETNAND(tmpset, p->p_sigmask); SIGSETNAND(tmpset, p->p_sigignore); if (SIGNOTEMPTY(p->p_siglist) && NFSINT_SIGMASK(tmpset)) 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. */ int nfs_sndlock(struct nfsreq *rep) { int *statep = &rep->r_nmp->nm_state; struct thread *td; int slptimeo; int slpflag; int error; slpflag = 0; slptimeo = 0; td = rep->r_td; if (rep->r_nmp->nm_flag & NFSMNT_INT) slpflag = PCATCH; error = 0; crit_enter(); while (*statep & NFSSTA_SNDLOCK) { *statep |= NFSSTA_WANTSND; if (nfs_sigintr(rep->r_nmp, rep, td)) { error = EINTR; break; } tsleep((caddr_t)statep, slpflag, "nfsndlck", slptimeo); if (slpflag == PCATCH) { slpflag = 0; slptimeo = 2 * hz; } } /* Always fail if our request has been cancelled. */ if ((rep->r_flags & R_SOFTTERM)) error = EINTR; if (error == 0) *statep |= NFSSTA_SNDLOCK; crit_exit(); return (error); } /* * Unlock the stream socket for others. */ void nfs_sndunlock(struct nfsreq *rep) { int *statep = &rep->r_nmp->nm_state; if ((*statep & NFSSTA_SNDLOCK) == 0) panic("nfs sndunlock"); crit_enter(); *statep &= ~NFSSTA_SNDLOCK; if (*statep & NFSSTA_WANTSND) { *statep &= ~NFSSTA_WANTSND; wakeup((caddr_t)statep); } crit_exit(); } static int nfs_rcvlock(struct nfsreq *rep) { int *statep = &rep->r_nmp->nm_state; int slpflag; int slptimeo; int error; /* * Unconditionally check for completion in case another nfsiod * get the packet while the caller was blocked, before the caller * called us. Packet reception is handled by mainline code which * is protected by the BGL at the moment. * * We do not strictly need the second check just before the * tsleep(), but it's good defensive programming. */ if (rep->r_mrep != NULL) return (EALREADY); if (rep->r_nmp->nm_flag & NFSMNT_INT) slpflag = PCATCH; else slpflag = 0; slptimeo = 0; error = 0; crit_enter(); while (*statep & NFSSTA_RCVLOCK) { if (nfs_sigintr(rep->r_nmp, rep, rep->r_td)) { error = EINTR; break; } if (rep->r_mrep != NULL) { error = EALREADY; break; } *statep |= NFSSTA_WANTRCV; tsleep((caddr_t)statep, slpflag, "nfsrcvlk", slptimeo); /* * If our reply was recieved while we were sleeping, * then just return without taking the lock to avoid a * situation where a single iod could 'capture' the * recieve lock. */ if (rep->r_mrep != NULL) { error = EALREADY; break; } if (slpflag == PCATCH) { slpflag = 0; slptimeo = 2 * hz; } } if (error == 0) { *statep |= NFSSTA_RCVLOCK; rep->r_nmp->nm_rcvlock_td = curthread; /* DEBUGGING */ } crit_exit(); return (error); } /* * Unlock the stream socket for others. */ static void nfs_rcvunlock(struct nfsreq *rep) { int *statep = &rep->r_nmp->nm_state; if ((*statep & NFSSTA_RCVLOCK) == 0) panic("nfs rcvunlock"); crit_enter(); rep->r_nmp->nm_rcvlock_td = (void *)-1; /* DEBUGGING */ *statep &= ~NFSSTA_RCVLOCK; if (*statep & NFSSTA_WANTRCV) { *statep &= ~NFSSTA_WANTRCV; wakeup((caddr_t)statep); } crit_exit(); } /* * nfs_realign: * * Check for badly aligned mbuf data and realign by copying the unaligned * portion of the data into a new mbuf chain and freeing the portions * of the old chain that were replaced. * * We cannot simply realign the data within the existing mbuf chain * because the underlying buffers may contain other rpc commands and * we cannot afford to overwrite them. * * We would prefer to avoid this situation entirely. The situation does * not occur with NFS/UDP and is supposed to only occassionally occur * with TCP. Use vfs.nfs.realign_count and realign_test to check this. */ static void nfs_realign(struct mbuf **pm, int hsiz) { struct mbuf *m; struct mbuf *n = NULL; int off = 0; ++nfs_realign_test; while ((m = *pm) != NULL) { if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) { n = m_getl(m->m_len, MB_WAIT, MT_DATA, 0, NULL); n->m_len = 0; break; } pm = &m->m_next; } /* * If n is non-NULL, loop on m copying data, then replace the * portion of the chain that had to be realigned. */ if (n != NULL) { ++nfs_realign_count; while (m) { m_copyback(n, off, m->m_len, mtod(m, caddr_t)); off += m->m_len; m = m->m_next; } m_freem(*pm); *pm = n; } } #ifndef NFS_NOSERVER /* * Parse an RPC request * - verify it * - fill in the cred struct. */ int nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header) { int len, i; u_int32_t *tl; int32_t t1; struct uio uio; struct iovec iov; caddr_t dpos, cp2, cp; u_int32_t nfsvers, auth_type; uid_t nickuid; int error = 0, ticklen; struct mbuf *mrep, *md; struct nfsuid *nuidp; struct timeval tvin, tvout; #if 0 /* until encrypted keys are implemented */ NFSKERBKEYSCHED_T keys; /* stores key schedule */ #endif mrep = nd->nd_mrep; md = nd->nd_md; dpos = nd->nd_dpos; if (has_header) { nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); if (*tl++ != rpc_call) { m_freem(mrep); return (EBADRPC); } } else nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); nd->nd_repstat = 0; nd->nd_flag = 0; if (*tl++ != rpc_vers) { nd->nd_repstat = ERPCMISMATCH; nd->nd_procnum = NFSPROC_NOOP; return (0); } if (*tl != nfs_prog) { nd->nd_repstat = EPROGUNAVAIL; nd->nd_procnum = NFSPROC_NOOP; return (0); } tl++; nfsvers = fxdr_unsigned(u_int32_t, *tl++); if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) { nd->nd_repstat = EPROGMISMATCH; nd->nd_procnum = NFSPROC_NOOP; return (0); } if (nfsvers == NFS_VER3) nd->nd_flag = ND_NFSV3; nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); if (nd->nd_procnum == NFSPROC_NULL) return (0); if (nd->nd_procnum >= NFS_NPROCS || (nd->nd_procnum >= NQNFSPROC_GETLEASE) || (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { nd->nd_repstat = EPROCUNAVAIL; nd->nd_procnum = NFSPROC_NOOP; return (0); } if ((nd->nd_flag & ND_NFSV3) == 0) nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; auth_type = *tl++; len = fxdr_unsigned(int, *tl++); if (len < 0 || len > RPCAUTH_MAXSIZ) { m_freem(mrep); return (EBADRPC); } nd->nd_flag &= ~ND_KERBAUTH; /* * 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_int32_t *, 3 * NFSX_UNSIGNED); bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred)); nd->nd_cr.cr_ref = 1; 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_int32_t *, (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); if (nd->nd_cr.cr_ngroups > 1) nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); len = fxdr_unsigned(int, *++tl); if (len < 0 || len > RPCAUTH_MAXSIZ) { m_freem(mrep); return (EBADRPC); } if (len > 0) nfsm_adv(nfsm_rndup(len)); } else if (auth_type == rpc_auth_kerb) { switch (fxdr_unsigned(int, *tl++)) { case RPCAKN_FULLNAME: ticklen = fxdr_unsigned(int, *tl); *((u_int32_t *)nfsd->nfsd_authstr) = *tl; uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 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)&nfsd->nfsd_authstr[4]; iov.iov_len = RPCAUTH_MAXSIZ - 4; nfsm_mtouio(&uio, uio.uio_resid); nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); if (*tl++ != rpc_auth_kerb || fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { printf("Bad kerb verifier\n"); nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); nd->nd_procnum = NFSPROC_NOOP; return (0); } nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); tl = (u_int32_t *)cp; if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { printf("Not fullname kerb verifier\n"); nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); nd->nd_procnum = NFSPROC_NOOP; return (0); } cp += NFSX_UNSIGNED; bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED); nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; nd->nd_flag |= ND_KERBFULL; nfsd->nfsd_flag |= NFSD_NEEDAUTH; break; case RPCAKN_NICKNAME: if (len != 2 * NFSX_UNSIGNED) { printf("Kerb nickname short\n"); nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); nd->nd_procnum = NFSPROC_NOOP; return (0); } nickuid = fxdr_unsigned(uid_t, *tl); nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); if (*tl++ != rpc_auth_kerb || fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { printf("Kerb nick verifier bad\n"); nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); nd->nd_procnum = NFSPROC_NOOP; return (0); } nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); tvin.tv_sec = *tl++; tvin.tv_usec = *tl; for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; nuidp != 0; nuidp = nuidp->nu_hash.le_next) { if (nuidp->nu_cr.cr_uid == nickuid && (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), &nuidp->nu_haddr, nd->nd_nam2))) break; } if (!nuidp) { nd->nd_repstat = (NFSERR_AUTHERR|AUTH_REJECTCRED); nd->nd_procnum = NFSPROC_NOOP; return (0); } /* * Now, decrypt the timestamp using the session key * and validate it. */ #ifdef NFSKERB XXX #endif tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); if (nuidp->nu_expire < time_second || nuidp->nu_timestamp.tv_sec > tvout.tv_sec || (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { nuidp->nu_expire = 0; nd->nd_repstat = (NFSERR_AUTHERR|AUTH_REJECTVERF); nd->nd_procnum = NFSPROC_NOOP; return (0); } nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); nd->nd_flag |= ND_KERBNICK; }; } else { nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); nd->nd_procnum = NFSPROC_NOOP; return (0); } nd->nd_md = md; nd->nd_dpos = dpos; return (0); nfsmout: return (error); } #endif /* * Send a message to the originating process's terminal. The thread and/or * process may be NULL. YYY the thread should not be NULL but there may * still be some uio_td's that are still being passed as NULL through to * nfsm_request(). */ static int nfs_msg(struct thread *td, char *server, char *msg) { tpr_t tpr; if (td && td->td_proc) tpr = tprintf_open(td->td_proc); else tpr = NULL; tprintf(tpr, "nfs server %s: %s\n", server, msg); tprintf_close(tpr); return (0); } #ifndef NFS_NOSERVER /* * 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 MB_WAIT from an nfsd. */ void nfsrv_rcv(struct socket *so, void *arg, int waitflag) { struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; struct mbuf *m; struct mbuf *mp; struct sockaddr *nam; struct uio auio; int flags, error; int nparallel_wakeup = 0; if ((slp->ns_flag & SLP_VALID) == 0) return; /* * Do not allow an infinite number of completed RPC records to build * up before we stop reading data from the socket. Otherwise we could * end up holding onto an unreasonable number of mbufs for requests * waiting for service. * * This should give pretty good feedback to the TCP * layer and prevents a memory crunch for other protocols. * * Note that the same service socket can be dispatched to several * nfs servers simultaniously. * * the tcp protocol callback calls us with MB_DONTWAIT. * nfsd calls us with MB_WAIT (typically). */ if (waitflag == MB_DONTWAIT && slp->ns_numrec >= nfsd_waiting / 2 + 1) { slp->ns_flag |= SLP_NEEDQ; goto dorecs; } /* * Handle protocol specifics to parse an RPC request. We always * pull from the socket using non-blocking I/O. */ auio.uio_td = NULL; if (so->so_type == SOCK_STREAM) { /* * The data has to be read in an orderly fashion from a TCP * stream, unlike a UDP socket. It is possible for soreceive * and/or nfsrv_getstream() to block, so make sure only one * entity is messing around with the TCP stream at any given * moment. The receive sockbuf's lock in soreceive is not * sufficient. * * Note that this procedure can be called from any number of * NFS severs *OR* can be upcalled directly from a TCP * protocol thread. */ if (slp->ns_flag & SLP_GETSTREAM) { slp->ns_flag |= SLP_NEEDQ; goto dorecs; } slp->ns_flag |= SLP_GETSTREAM; /* * Do soreceive(). */ auio.uio_resid = 1000000000; flags = MSG_DONTWAIT; error = so_pru_soreceive(so, &nam, &auio, &mp, NULL, &flags); if (error || mp == (struct mbuf *)0) { if (error == EWOULDBLOCK) slp->ns_flag |= SLP_NEEDQ; else slp->ns_flag |= SLP_DISCONN; slp->ns_flag &= ~SLP_GETSTREAM; 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 as many record(s) as we can out of the * raw stream data. */ error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup); if (error) { if (error == EPERM) slp->ns_flag |= SLP_DISCONN; else slp->ns_flag |= SLP_NEEDQ; } slp->ns_flag &= ~SLP_GETSTREAM; } else { /* * For UDP soreceive typically pulls just one packet, loop * to get the whole batch. */ do { auio.uio_resid = 1000000000; flags = MSG_DONTWAIT; error = so_pru_soreceive(so, &nam, &auio, &mp, NULL, &flags); if (mp) { struct nfsrv_rec *rec; int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK; rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf); if (!rec) { if (nam) FREE(nam, M_SONAME); m_freem(mp); continue; } nfs_realign(&mp, 10 * NFSX_UNSIGNED); rec->nr_address = nam; rec->nr_packet = mp; STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); ++slp->ns_numrec; ++nparallel_wakeup; } if (error) { if ((so->so_proto->pr_flags & PR_CONNREQUIRED) && error != EWOULDBLOCK) { slp->ns_flag |= SLP_DISCONN; goto dorecs; } } } while (mp); } /* * If we were upcalled from the tcp protocol layer and we have * fully parsed records ready to go, or there is new data pending, * or something went wrong, try to wake up an nfsd thread to deal * with it. */ dorecs: if (waitflag == MB_DONTWAIT && (slp->ns_numrec > 0 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) { nfsrv_wakenfsd(slp, nparallel_wakeup); } } /* * 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. */ static int nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp) { struct mbuf *m, **mpp; char *cp1, *cp2; int len; struct mbuf *om, *m2, *recm; u_int32_t recmark; for (;;) { if (slp->ns_reclen == 0) { if (slp->ns_cc < NFSX_UNSIGNED) 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; recmark = ntohl(recmark); slp->ns_reclen = recmark & ~0x80000000; if (recmark & 0x80000000) slp->ns_flag |= SLP_LASTFRAG; else slp->ns_flag &= ~SLP_LASTFRAG; if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) { log(LOG_ERR, "%s (%d) from nfs client\n", "impossible packet length", slp->ns_reclen); return (EPERM); } } /* * Now get the record part. * * Note that slp->ns_reclen may be 0. Linux sometimes * generates 0-length RPCs */ recm = NULL; 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 { 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 { return (0); } /* * Accumulate the fragments into a record. */ mpp = &slp->ns_frag; while (*mpp) mpp = &((*mpp)->m_next); *mpp = recm; if (slp->ns_flag & SLP_LASTFRAG) { struct nfsrv_rec *rec; int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK; rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf); if (!rec) { m_freem(slp->ns_frag); } else { nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED); rec->nr_address = (struct sockaddr *)0; rec->nr_packet = slp->ns_frag; STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); ++slp->ns_numrec; ++*countp; } slp->ns_frag = (struct mbuf *)0; } } } /* * Parse an RPC header. */ int nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd, struct nfsrv_descript **ndp) { struct nfsrv_rec *rec; struct mbuf *m; struct sockaddr *nam; struct nfsrv_descript *nd; int error; *ndp = NULL; if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec)) return (ENOBUFS); rec = STAILQ_FIRST(&slp->ns_rec); STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); KKASSERT(slp->ns_numrec > 0); --slp->ns_numrec; nam = rec->nr_address; m = rec->nr_packet; free(rec, M_NFSRVDESC); MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), M_NFSRVDESC, M_WAITOK); nd->nd_md = nd->nd_mrep = m; nd->nd_nam2 = nam; nd->nd_dpos = mtod(m, caddr_t); error = nfs_getreq(nd, nfsd, TRUE); if (error) { if (nam) { FREE(nam, M_SONAME); } free((caddr_t)nd, M_NFSRVDESC); return (error); } *ndp = nd; nfsd->nfsd_nd = nd; return (0); } /* * Try to assign service sockets to nfsd threads based on the number * of new rpc requests that have been queued on the service socket. * * If no nfsd's are available or additonal requests are pending, set the * NFSD_CHECKSLP flag so that one of the running nfsds will go look for * the work in the nfssvc_sock list when it is finished processing its * current work. This flag is only cleared when an nfsd can not find * any new work to perform. */ void nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel) { struct nfsd *nd; if ((slp->ns_flag & SLP_VALID) == 0) return; if (nparallel <= 1) nparallel = 1; TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) { if (nd->nfsd_flag & NFSD_WAITING) { nd->nfsd_flag &= ~NFSD_WAITING; if (nd->nfsd_slp) panic("nfsd wakeup"); slp->ns_sref++; nd->nfsd_slp = slp; wakeup((caddr_t)nd); if (--nparallel == 0) break; } } if (nparallel) { slp->ns_flag |= SLP_DOREC; nfsd_head_flag |= NFSD_CHECKSLP; } } #endif /* NFS_NOSERVER */