535 lines
13 KiB
C
535 lines
13 KiB
C
/* $NetBSD: nfs_boot.c,v 1.48 1998/08/09 21:19:50 perry Exp $ */
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/*-
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* Copyright (c) 1995, 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Adam Glass and Gordon W. Ross.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Support for NFS diskless booting, specifically getting information
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* about where to mount root from, what pathnames, etc.
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*/
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#include "opt_nfs_boot.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/device.h>
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#include <sys/ioctl.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/mbuf.h>
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#include <sys/reboot.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_ether.h>
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#include <net/if_types.h>
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#include <netinet/in.h>
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#include <netinet/if_inarp.h>
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#include <nfs/rpcv2.h>
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#include <nfs/krpc.h>
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#include <nfs/xdr_subs.h>
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#include <nfs/nfsproto.h>
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#include <nfs/nfs.h>
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#include <nfs/nfsmount.h>
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#include <nfs/nfsdiskless.h>
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/*
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* There are two implementations of NFS diskless boot.
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* One implementation uses BOOTP (RFC951, RFC1048),
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* the other uses Sun RPC/bootparams. See the files:
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* nfs_bootp.c: BOOTP (RFC951, RFC1048)
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* nfs_bootsun.c: Sun RPC/bootparams
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*/
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#if defined(NFS_BOOT_BOOTP) || defined(NFS_BOOT_DHCP)
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int nfs_boot_rfc951 = 1; /* BOOTP enabled (default) */
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#endif
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#ifdef NFS_BOOT_BOOTPARAM
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int nfs_boot_bootparam = 1; /* BOOTPARAM enabled (default) */
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#endif
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/* mountd RPC */
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static int md_mount __P((struct sockaddr_in *mdsin, char *path,
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struct nfs_args *argp));
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static void nfs_boot_defrt __P((struct in_addr *));
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static int nfs_boot_getfh __P((struct nfs_dlmount *ndm));
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/*
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* Called with an empty nfs_diskless struct to be filled in.
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* Find an interface, determine its ip address (etc.) and
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* save all the boot parameters in the nfs_diskless struct.
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*/
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int
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nfs_boot_init(nd, procp)
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struct nfs_diskless *nd;
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struct proc *procp;
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{
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struct ifnet *ifp;
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int error;
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/*
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* Find the network interface.
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*/
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ifp = ifunit(root_device->dv_xname);
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if (ifp == NULL) {
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printf("nfs_boot: '%s' not found\n",
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root_device->dv_xname);
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return (ENXIO);
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}
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error = EADDRNOTAVAIL; /* ??? */
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#if defined(NFS_BOOT_BOOTP) || defined(NFS_BOOT_DHCP)
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if (error && nfs_boot_rfc951) {
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#if defined(NFS_BOOT_DHCP)
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printf("nfs_boot: trying DHCP/BOOTP\n");
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#else
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printf("nfs_boot: trying BOOTP\n");
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#endif
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error = nfs_bootdhcp(ifp, nd, procp);
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}
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#endif
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#ifdef NFS_BOOT_BOOTPARAM
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if (error && nfs_boot_bootparam) {
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printf("nfs_boot: trying RARP (and RPC/bootparam)\n");
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error = nfs_bootparam(ifp, nd, procp);
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}
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#endif
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if (error)
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return (error);
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/*
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* If the gateway address is set, add a default route.
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* (The mountd RPCs may go across a gateway.)
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*/
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if (nd->nd_gwip.s_addr)
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nfs_boot_defrt(&nd->nd_gwip);
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/*
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* Now fetch the NFS file handles as appropriate.
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*/
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error = nfs_boot_getfh(&nd->nd_root);
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return (error);
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}
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int nfs_boot_setrecvtimo(so)
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struct socket *so;
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{
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struct mbuf *m;
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struct timeval *tv;
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m = m_get(M_WAIT, MT_SOOPTS);
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tv = mtod(m, struct timeval *);
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m->m_len = sizeof(*tv);
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tv->tv_sec = 1;
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tv->tv_usec = 0;
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return(sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m));
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}
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int nfs_boot_enbroadcast(so)
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struct socket *so;
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{
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struct mbuf *m;
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int32_t *on;
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m = m_get(M_WAIT, MT_SOOPTS);
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on = mtod(m, int32_t *);
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m->m_len = sizeof(*on);
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*on = 1;
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return(sosetopt(so, SOL_SOCKET, SO_BROADCAST, m));
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}
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int nfs_boot_sobind_ipport(so, port)
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struct socket *so;
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u_int16_t port;
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{
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struct mbuf *m;
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struct sockaddr_in *sin;
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int error;
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m = m_getclr(M_WAIT, MT_SONAME);
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sin = mtod(m, struct sockaddr_in *);
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sin->sin_len = m->m_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = INADDR_ANY;
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sin->sin_port = htons(port);
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error = sobind(so, m);
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m_freem(m);
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return(error);
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}
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/*
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* What is the longest we will wait before re-sending a request?
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* Note this is also the frequency of "timeout" messages.
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* The re-send loop counts up linearly to this maximum, so the
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* first complaint will happen after (1+2+3+4+5)=15 seconds.
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*/
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#define MAX_RESEND_DELAY 5 /* seconds */
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#define TOTAL_TIMEOUT 30 /* seconds */
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int nfs_boot_sendrecv(so, nam, sndproc, snd, rcvproc, rcv,
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from_p, context)
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struct socket *so;
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struct mbuf *nam;
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int (*sndproc) __P((struct mbuf*, void*, int));
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struct mbuf *snd;
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int (*rcvproc) __P((struct mbuf*, void*));
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struct mbuf **rcv, **from_p;
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void *context;
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{
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int error, rcvflg, timo, secs, waited;
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struct mbuf *m, *from;
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struct uio uio;
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/* Free at end if not null. */
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from = NULL;
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/*
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* Send it, repeatedly, until a reply is received,
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* but delay each re-send by an increasing amount.
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* If the delay hits the maximum, start complaining.
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*/
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waited = timo = 0;
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send_again:
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waited += timo;
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if (waited >= TOTAL_TIMEOUT)
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return(ETIMEDOUT);
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/* Determine new timeout. */
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if (timo < MAX_RESEND_DELAY)
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timo++;
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else
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printf("nfs_boot: timeout...\n");
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if (sndproc) {
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error = (*sndproc)(snd, context, waited);
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if (error)
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goto out;
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}
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/* Send request (or re-send). */
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m = m_copypacket(snd, M_WAIT);
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if (m == NULL) {
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error = ENOBUFS;
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goto out;
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}
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error = (*so->so_send)(so, nam, NULL, m, NULL, 0);
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if (error) {
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printf("nfs_boot: sosend: %d\n", error);
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goto out;
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}
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m = NULL;
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/*
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* Wait for up to timo seconds for a reply.
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* The socket receive timeout was set to 1 second.
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*/
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secs = timo;
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for (;;) {
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if (from) {
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m_freem(from);
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from = NULL;
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}
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if (m) {
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m_freem(m);
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m = NULL;
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}
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uio.uio_resid = 1 << 16; /* ??? */
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rcvflg = 0;
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error = (*so->so_receive)(so, &from, &uio, &m, NULL, &rcvflg);
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if (error == EWOULDBLOCK) {
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if (--secs <= 0)
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goto send_again;
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continue;
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}
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if (error)
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goto out;
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#ifdef DIAGNOSTIC
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if (!m || !(m->m_flags & M_PKTHDR)
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|| (1 << 16) - uio.uio_resid != m->m_pkthdr.len)
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panic("nfs_boot_sendrecv: return size");
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#endif
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if ((*rcvproc)(m, context))
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continue;
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if (rcv)
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*rcv = m;
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else
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m_freem(m);
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if (from_p) {
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*from_p = from;
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from = NULL;
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}
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break;
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}
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out:
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if (from) m_freem(from);
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return(error);
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}
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/*
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* Install a default route to the passed IP address.
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*/
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static void
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nfs_boot_defrt(gw_ip)
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struct in_addr *gw_ip;
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{
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struct sockaddr dst, gw, mask;
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struct sockaddr_in *sin;
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int error;
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/* Destination: (default) */
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memset((caddr_t)&dst, 0, sizeof(dst));
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dst.sa_len = sizeof(dst);
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dst.sa_family = AF_INET;
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/* Gateway: */
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memset((caddr_t)&gw, 0, sizeof(gw));
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sin = (struct sockaddr_in *)&gw;
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sin->sin_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = gw_ip->s_addr;
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/* Mask: (zero length) */
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/* XXX - Just pass a null pointer? */
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memset(&mask, 0, sizeof(mask));
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/* add, dest, gw, mask, flags, 0 */
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error = rtrequest(RTM_ADD, &dst, &gw, &mask,
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(RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
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if (error) {
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printf("nfs_boot: add route, error=%d\n", error);
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error = 0;
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}
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}
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/*
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* Get an initial NFS file handle using Sun RPC/mountd.
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* Separate function because we used to call it twice.
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* (once for root and once for swap)
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*/
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static int
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nfs_boot_getfh(ndm)
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struct nfs_dlmount *ndm; /* output */
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{
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struct nfs_args *args;
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struct sockaddr_in *sin;
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char *pathname;
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int error;
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u_int16_t port;
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args = &ndm->ndm_args;
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/* Initialize mount args. */
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memset((caddr_t) args, 0, sizeof(*args));
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args->addr = &ndm->ndm_saddr;
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args->addrlen = args->addr->sa_len;
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#ifdef NFS_BOOT_TCP
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args->sotype = SOCK_STREAM;
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#else
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args->sotype = SOCK_DGRAM;
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#endif
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args->fh = ndm->ndm_fh;
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args->hostname = ndm->ndm_host;
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args->flags = NFSMNT_RESVPORT | NFSMNT_NFSV3;
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#ifdef NFS_BOOT_OPTIONS
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args->flags |= NFS_BOOT_OPTIONS;
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#endif
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#ifdef NFS_BOOT_RWSIZE
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/*
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* Reduce rsize,wsize for interfaces that consistently
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* drop fragments of long UDP messages. (i.e. wd8003).
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* You can always change these later via remount.
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*/
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args->flags |= NFSMNT_WSIZE | NFSMNT_RSIZE;
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args->wsize = NFS_BOOT_RWSIZE;
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args->rsize = NFS_BOOT_RWSIZE;
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#endif
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/*
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* Find the pathname part of the "server:pathname"
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* string left in ndm->ndm_host by nfs_boot_init.
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*/
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pathname = strchr(ndm->ndm_host, ':');
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if (pathname == 0) {
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printf("nfs_boot: getfh - no pathname\n");
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return (EIO);
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}
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pathname++;
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/*
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* Get file handle using RPC to mountd/mount
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*/
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sin = (struct sockaddr_in *)&ndm->ndm_saddr;
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error = md_mount(sin, pathname, args);
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if (error) {
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printf("nfs_boot: mountd `%s', error=%d\n",
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ndm->ndm_host, error);
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return (error);
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}
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/* Set port number for NFS use. */
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/* XXX: NFS port is always 2049, right? */
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#ifdef NFS_BOOT_TCP
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retry:
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#endif
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error = krpc_portmap(sin, NFS_PROG,
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(args->flags & NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
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(args->sotype == SOCK_STREAM) ? IPPROTO_TCP : IPPROTO_UDP,
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&port);
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if (port == htons(0))
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error = EIO;
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if (error) {
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#ifdef NFS_BOOT_TCP
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if (args->sotype == SOCK_STREAM) {
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args->sotype = SOCK_DGRAM;
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goto retry;
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}
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#endif
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printf("nfs_boot: portmap NFS, error=%d\n", error);
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return (error);
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}
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sin->sin_port = port;
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return (0);
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}
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/*
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* RPC: mountd/mount
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* Given a server pathname, get an NFS file handle.
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* Also, sets sin->sin_port to the NFS service port.
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*/
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static int
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md_mount(mdsin, path, argp)
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struct sockaddr_in *mdsin; /* mountd server address */
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char *path;
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struct nfs_args *argp;
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{
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/* The RPC structures */
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struct rdata {
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u_int32_t errno;
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union {
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u_int8_t v2fh[NFSX_V2FH];
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struct {
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u_int32_t fhlen;
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u_int8_t fh[1];
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} v3fh;
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} fh;
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} *rdata;
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struct mbuf *m;
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u_int8_t *fh;
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int minlen, error;
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int mntver;
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mntver = (argp->flags & NFSMNT_NFSV3) ? 3 : 2;
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do {
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/*
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* Get port number for MOUNTD.
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*/
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error = krpc_portmap(mdsin, RPCPROG_MNT, mntver,
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IPPROTO_UDP, &mdsin->sin_port);
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if (error)
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continue;
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/* This mbuf is consumed by krpc_call. */
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m = xdr_string_encode(path, strlen(path));
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if (m == NULL)
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return ENOMEM;
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/* Do RPC to mountd. */
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error = krpc_call(mdsin, RPCPROG_MNT, mntver,
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RPCMNT_MOUNT, &m, NULL);
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if (error != EPROGMISMATCH)
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break;
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/* Try lower version of mountd. */
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} while (--mntver >= 1);
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if (error) {
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printf("nfs_boot: mountd error=%d\n", error);
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return error;
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}
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if (mntver != 3)
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argp->flags &= ~NFSMNT_NFSV3;
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/* The reply might have only the errno. */
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if (m->m_len < 4)
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goto bad;
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/* Have at least errno, so check that. */
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rdata = mtod(m, struct rdata *);
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error = fxdr_unsigned(u_int32_t, rdata->errno);
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if (error)
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goto out;
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/* Have errno==0, so the fh must be there. */
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if (mntver == 3) {
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argp->fhsize = fxdr_unsigned(u_int32_t, rdata->fh.v3fh.fhlen);
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if (argp->fhsize > NFSX_V3FHMAX)
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goto bad;
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minlen = 2 * sizeof(u_int32_t) + argp->fhsize;
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} else {
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argp->fhsize = NFSX_V2FH;
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minlen = sizeof(u_int32_t) + argp->fhsize;
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}
|
|
|
|
if (m->m_len < minlen) {
|
|
m = m_pullup(m, minlen);
|
|
if (m == NULL)
|
|
return(EBADRPC);
|
|
rdata = mtod(m, struct rdata *);
|
|
}
|
|
|
|
fh = (mntver == 3) ?
|
|
rdata->fh.v3fh.fh : rdata->fh.v2fh;
|
|
memcpy(argp->fh, fh, argp->fhsize);
|
|
|
|
goto out;
|
|
|
|
bad:
|
|
error = EBADRPC;
|
|
|
|
out:
|
|
m_freem(m);
|
|
return error;
|
|
}
|