484 lines
12 KiB
C
484 lines
12 KiB
C
/* $NetBSD: nfs_bootparam.c,v 1.19 2001/11/10 10:59:09 lukem 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, Sun-style (RPC/bootparams)
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: nfs_bootparam.c,v 1.19 2001/11/10 10:59:09 lukem Exp $");
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#include "opt_nfs_boot.h"
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#include "opt_inet.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/if_types.h>
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#include <net/route.h>
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#include <net/if_ether.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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#include "arp.h"
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/*
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* There are two implementations of NFS diskless boot.
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* This implementation uses Sun RPC/bootparams, and the
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* the other uses BOOTP (RFC951 - see nfs_bootdhcp.c).
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*
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* The Sun-style boot sequence goes as follows:
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* (1) Use RARP to get our interface address
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* (2) Use RPC/bootparam/whoami to get our hostname,
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* our IP address, and the server's IP address.
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* (3) Use RPC/bootparam/getfile to get the root path
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* (4) Use RPC/mountd to get the root file handle
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* (5) Use RPC/bootparam/getfile to get the swap path
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* (6) Use RPC/mountd to get the swap file handle
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*/
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/* bootparam RPC */
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static int bp_whoami __P((struct sockaddr_in *bpsin,
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struct in_addr *my_ip, struct in_addr *gw_ip));
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static int bp_getfile __P((struct sockaddr_in *bpsin, char *key,
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struct nfs_dlmount *ndm));
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/*
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* Get client name, gateway address, then
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* get root and swap server:pathname info.
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* RPCs: bootparam/whoami, bootparam/getfile
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*
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* Use the old broadcast address for the WHOAMI
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* call because we do not yet know our netmask.
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* The server address returned by the WHOAMI call
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* is used for all subsequent booptaram RPCs.
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*/
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int
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nfs_bootparam(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 = nd->nd_ifp;
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struct in_addr my_ip, arps_ip, gw_ip;
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struct sockaddr_in bp_sin;
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struct sockaddr_in *sin;
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#ifndef NFS_BOOTPARAM_NOGATEWAY
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struct nfs_dlmount *gw_ndm = 0;
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char *p;
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u_int32_t mask;
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#endif
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int error;
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/*
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* Bring up the interface. (just set the "up" flag)
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*/
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error = nfs_boot_ifupdown(ifp, procp, 1);
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if (error) {
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printf("nfs_boot: SIFFLAGS, error=%d\n", error);
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return (error);
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}
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error = EADDRNOTAVAIL;
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#ifdef INET
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#if NARP > 0
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if (ifp->if_type == IFT_ETHER || ifp->if_type == IFT_FDDI) {
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/*
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* Do RARP for the interface address.
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*/
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error = revarpwhoarewe(ifp, &arps_ip, &my_ip);
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}
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#endif
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#endif
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if (error) {
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printf("revarp failed, error=%d\n", error);
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goto out;
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}
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nd->nd_myip.s_addr = my_ip.s_addr;
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printf("nfs_boot: client_addr=%s", inet_ntoa(my_ip));
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printf(" (RARP from %s)\n", inet_ntoa(arps_ip));
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/*
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* Do enough of ifconfig(8) so that the chosen interface
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* can talk to the servers. (just set the address)
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*/
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error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr,
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INADDR_ANY, INADDR_ANY);
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if (error) {
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printf("nfs_boot: set ifaddr, error=%d\n", error);
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goto out;
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}
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/*
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* Get client name and gateway address.
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* RPC: bootparam/whoami
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* Use the old broadcast address for the WHOAMI
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* call because we do not yet know our netmask.
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* The server address returned by the WHOAMI call
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* is used for all subsequent booptaram RPCs.
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*/
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sin = &bp_sin;
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memset((caddr_t)sin, 0, sizeof(*sin));
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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 = INADDR_BROADCAST;
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/* Do the RPC/bootparam/whoami. */
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error = bp_whoami(sin, &my_ip, &gw_ip);
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if (error) {
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printf("nfs_boot: bootparam whoami, error=%d\n", error);
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goto delout;
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}
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printf("nfs_boot: server_addr=%s\n", inet_ntoa(sin->sin_addr));
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printf("nfs_boot: hostname=%s\n", hostname);
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/*
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* Now fetch the server:pathname strings and server IP
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* for root and swap. Missing swap is not fatal.
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*/
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error = bp_getfile(sin, "root", &nd->nd_root);
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if (error) {
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printf("nfs_boot: bootparam get root: %d\n", error);
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goto delout;
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}
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#ifndef NFS_BOOTPARAM_NOGATEWAY
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gw_ndm = malloc(sizeof(*gw_ndm), M_NFSMNT, M_WAITOK);
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memset((caddr_t)gw_ndm, 0, sizeof(*gw_ndm));
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error = bp_getfile(sin, "gateway", gw_ndm);
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if (error) {
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/* No gateway supplied. No error, but try fallback. */
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error = 0;
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goto nogwrepl;
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}
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sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr;
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if (sin->sin_addr.s_addr == 0)
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goto out; /* no gateway */
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/* OK, we have a gateway! */
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printf("nfs_boot: gateway=%s\n", inet_ntoa(sin->sin_addr));
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/* Just save it. Caller adds the route. */
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nd->nd_gwip = sin->sin_addr;
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/* Look for a mask string after the colon. */
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p = strchr(gw_ndm->ndm_host, ':');
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if (p == 0)
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goto out; /* no netmask */
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/* have pathname */
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p++; /* skip ':' */
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mask = inet_addr(p); /* libkern */
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if (mask == 0)
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goto out; /* no netmask */
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/* Have a netmask too! Save it; update the I/F. */
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nd->nd_mask.s_addr = mask;
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printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask));
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(void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr);
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error = nfs_boot_setaddress(ifp, procp, my_ip.s_addr,
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mask, INADDR_ANY);
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if (error) {
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printf("nfs_boot: set ifmask, error=%d\n", error);
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goto out;
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}
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goto gwok;
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nogwrepl:
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#endif
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#ifdef NFS_BOOT_GATEWAY
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/*
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* Note: we normally ignore the gateway address returned
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* by the "bootparam/whoami" RPC above, because many old
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* bootparam servers supply a bogus gateway value.
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*
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* These deficiencies in the bootparam RPC interface are
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* circumvented by using the bootparam/getfile RPC. The
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* parameter "gateway" is requested, and if its returned,
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* we use the "server" part of the reply as the gateway,
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* and use the "pathname" part of the reply as the mask.
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* (The mask comes to us as a string.)
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*/
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if (gw_ip.s_addr) {
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/* Our caller will add the route. */
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nd->nd_gwip = gw_ip;
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}
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#endif
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delout:
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if (error)
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(void) nfs_boot_deladdress(ifp, procp, my_ip.s_addr);
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out:
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if (error) {
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(void) nfs_boot_ifupdown(ifp, procp, 0);
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nfs_boot_flushrt(ifp);
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}
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#ifndef NFS_BOOTPARAM_NOGATEWAY
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gwok:
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if (gw_ndm)
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free(gw_ndm, M_NFSMNT);
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#endif
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return (error);
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}
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/*
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* RPC: bootparam/whoami
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* Given client IP address, get:
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* client name (hostname)
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* domain name (domainname)
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* gateway address
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*
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* The hostname and domainname are set here for convenience.
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*
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* Note - bpsin is initialized to the broadcast address,
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* and will be replaced with the bootparam server address
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* after this call is complete. Have to use PMAP_PROC_CALL
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* to make sure we get responses only from a servers that
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* know about us (don't want to broadcast a getport call).
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*/
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static int
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bp_whoami(bpsin, my_ip, gw_ip)
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struct sockaddr_in *bpsin;
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struct in_addr *my_ip;
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struct in_addr *gw_ip;
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{
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/* RPC structures for PMAPPROC_CALLIT */
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struct whoami_call {
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u_int32_t call_prog;
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u_int32_t call_vers;
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u_int32_t call_proc;
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u_int32_t call_arglen;
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} *call;
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struct callit_reply {
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u_int32_t port;
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u_int32_t encap_len;
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/* encapsulated data here */
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} *reply;
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struct mbuf *m, *from;
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struct sockaddr_in *sin;
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int error;
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int16_t port;
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/*
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* Build request message for PMAPPROC_CALLIT.
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*/
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m = m_get(M_WAIT, MT_DATA);
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call = mtod(m, struct whoami_call *);
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m->m_len = sizeof(*call);
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call->call_prog = txdr_unsigned(BOOTPARAM_PROG);
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call->call_vers = txdr_unsigned(BOOTPARAM_VERS);
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call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI);
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/*
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* append encapsulated data (client IP address)
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*/
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m->m_next = xdr_inaddr_encode(my_ip);
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call->call_arglen = txdr_unsigned(m->m_next->m_len);
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/* RPC: portmap/callit */
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bpsin->sin_port = htons(PMAPPORT);
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from = NULL;
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error = krpc_call(bpsin, PMAPPROG, PMAPVERS,
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PMAPPROC_CALLIT, &m, &from);
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if (error)
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return error;
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/*
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* Parse result message.
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*/
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if (m->m_len < sizeof(*reply)) {
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m = m_pullup(m, sizeof(*reply));
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if (m == NULL)
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goto bad;
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}
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reply = mtod(m, struct callit_reply *);
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port = fxdr_unsigned(u_int32_t, reply->port);
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m_adj(m, sizeof(*reply));
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/*
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* Save bootparam server address
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*/
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sin = mtod(from, struct sockaddr_in *);
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bpsin->sin_port = htons(port);
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bpsin->sin_addr.s_addr = sin->sin_addr.s_addr;
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/* client name */
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hostnamelen = MAXHOSTNAMELEN-1;
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m = xdr_string_decode(m, hostname, &hostnamelen);
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if (m == NULL)
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goto bad;
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/* domain name */
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domainnamelen = MAXHOSTNAMELEN-1;
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m = xdr_string_decode(m, domainname, &domainnamelen);
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if (m == NULL)
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goto bad;
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/* gateway address */
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m = xdr_inaddr_decode(m, gw_ip);
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if (m == NULL)
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goto bad;
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/* success */
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goto out;
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bad:
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printf("nfs_boot: bootparam_whoami: bad reply\n");
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error = EBADRPC;
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out:
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if (from)
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m_freem(from);
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if (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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* RPC: bootparam/getfile
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* Given client name and file "key", get:
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* server name
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* server IP address
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* server pathname
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*/
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static int
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bp_getfile(bpsin, key, ndm)
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struct sockaddr_in *bpsin;
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char *key;
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struct nfs_dlmount *ndm;
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{
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char pathname[MNAMELEN];
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struct in_addr inaddr;
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struct sockaddr_in *sin;
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struct mbuf *m;
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char *serv_name;
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int error, sn_len, path_len;
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/*
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* Build request message.
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*/
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/* client name (hostname) */
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m = xdr_string_encode(hostname, hostnamelen);
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if (m == NULL)
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return (ENOMEM);
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/* key name (root or swap) */
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m->m_next = xdr_string_encode(key, strlen(key));
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if (m->m_next == NULL)
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return (ENOMEM);
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/* RPC: bootparam/getfile */
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error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS,
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BOOTPARAM_GETFILE, &m, NULL);
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if (error)
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return error;
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/*
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* Parse result message.
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*/
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/* server name */
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serv_name = &ndm->ndm_host[0];
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sn_len = sizeof(ndm->ndm_host) - 1;
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m = xdr_string_decode(m, serv_name, &sn_len);
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if (m == NULL)
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goto bad;
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/* server IP address (mountd/NFS) */
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m = xdr_inaddr_decode(m, &inaddr);
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if (m == NULL)
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goto bad;
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/* server pathname */
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path_len = sizeof(pathname) - 1;
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m = xdr_string_decode(m, pathname, &path_len);
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if (m == NULL)
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goto bad;
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/*
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* Store the results in the nfs_dlmount.
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* The strings become "server:pathname"
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*/
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sin = (struct sockaddr_in *) &ndm->ndm_saddr;
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memset((caddr_t)sin, 0, sizeof(*sin));
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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 = inaddr;
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if ((sn_len + 1 + path_len + 1) > sizeof(ndm->ndm_host)) {
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printf("nfs_boot: getfile name too long\n");
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error = EIO;
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goto out;
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}
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ndm->ndm_host[sn_len] = ':';
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memcpy(ndm->ndm_host + sn_len + 1, pathname, path_len + 1);
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/* success */
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goto out;
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bad:
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printf("nfs_boot: bootparam_getfile: bad reply\n");
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error = EBADRPC;
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out:
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m_freem(m);
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return(0);
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}
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