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