544 lines
14 KiB
C
544 lines
14 KiB
C
/* $NetBSD: nfs_boot.c,v 1.22 1996/02/10 22:55:16 pk Exp $ */
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/*
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* Copyright (c) 1995 Adam Glass, Gordon Ross
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* All rights reserved.
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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. The name of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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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/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 <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsv2.h>
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#include <nfs/nfs.h>
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#include <nfs/nfsdiskless.h>
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#include <nfs/krpc.h>
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#include <nfs/xdr_subs.h>
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#include <nfs/nfs_var.h>
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#include "ether.h"
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#if NETHER == 0
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int 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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panic("nfs_boot_init: no ether");
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}
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#else /* NETHER */
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/*
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* Support for NFS diskless booting, specifically getting information
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* about where to boot from, what pathnames, etc.
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*
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* This implememtation uses RARP and the bootparam RPC.
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* We are forced to implement RPC anyway (to get file handles)
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* so we might as well take advantage of it for bootparam too.
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*
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* The diskless 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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* (This happens to be the way Sun does it too.)
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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 sockaddr_in *mdsin, char *servname, char *path));
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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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u_char *fh));
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/* other helpers */
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static void get_path_and_handle __P((struct sockaddr_in *bpsin,
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char *key, struct nfs_dlmount *ndmntp));
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char *nfsbootdevname;
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/*
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* Called with an empty nfs_diskless struct to be filled in.
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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 ifreq ireq;
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struct in_addr my_ip, gw_ip;
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struct sockaddr_in bp_sin;
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struct sockaddr_in *sin;
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struct ifnet *ifp;
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struct socket *so;
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int error;
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/*
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* Find an interface, rarp for its ip address, stuff it, the
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* implied broadcast addr, and netmask into a nfs_diskless struct.
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*
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* This was moved here from nfs_vfsops.c because this procedure
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* would be quite different if someone decides to write (i.e.) a
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* BOOTP version of this file (might not use RARP, etc.)
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*/
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/*
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* Find a network interface.
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*/
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if (nfsbootdevname)
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ifp = ifunit(nfsbootdevname);
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else
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for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next)
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if ((ifp->if_flags &
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(IFF_LOOPBACK|IFF_POINTOPOINT)) == 0)
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break;
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if (ifp == NULL)
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panic("nfs_boot: no suitable interface");
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sprintf(ireq.ifr_name, "%s%d", ifp->if_name, ifp->if_unit);
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printf("nfs_boot: using network interface '%s'\n",
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ireq.ifr_name);
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/*
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* Bring up the interface.
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*
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* Get the old interface flags and or IFF_UP into them; if
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* IFF_UP set blindly, interface selection can be clobbered.
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*/
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if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)) != 0)
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panic("nfs_boot: socreate, error=%d", error);
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error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)&ireq, procp);
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if (error)
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panic("nfs_boot: GIFFLAGS, error=%d", error);
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ireq.ifr_flags |= IFF_UP;
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error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)&ireq, procp);
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if (error)
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panic("nfs_boot: SIFFLAGS, error=%d", error);
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/*
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* Do RARP for the interface address.
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*/
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if ((error = revarpwhoami(&my_ip, ifp)) != 0)
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panic("revarp failed, error=%d", error);
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printf("nfs_boot: client_addr=0x%x\n", ntohl(my_ip.s_addr));
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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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sin = (struct sockaddr_in *)&ireq.ifr_addr;
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bzero((caddr_t)sin, 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 = my_ip.s_addr;
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error = ifioctl(so, SIOCSIFADDR, (caddr_t)&ireq, procp);
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if (error)
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panic("nfs_boot: set if addr, error=%d", error);
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soclose(so);
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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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bzero((caddr_t)&bp_sin, sizeof(bp_sin));
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bp_sin.sin_len = sizeof(bp_sin);
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bp_sin.sin_family = AF_INET;
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bp_sin.sin_addr.s_addr = INADDR_BROADCAST;
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hostnamelen = MAXHOSTNAMELEN;
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/* this returns gateway IP address */
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error = bp_whoami(&bp_sin, &my_ip, &gw_ip);
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if (error)
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panic("nfs_boot: bootparam whoami, error=%d", error);
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printf("nfs_boot: server_addr=0x%x\n",
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ntohl(bp_sin.sin_addr.s_addr));
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printf("nfs_boot: hostname=%s\n", hostname);
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#ifdef NFS_BOOT_GATEWAY
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/*
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* XXX - This code is conditionally compiled only because
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* many bootparam servers (in particular, SunOS 4.1.3)
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* always set the gateway address to their own address.
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* The bootparam server is not necessarily the gateway.
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* We could just believe the server, and at worst you would
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* need to delete the incorrect default route before adding
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* the correct one, but for simplicity, ignore the gateway.
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* If your server is OK, you can turn on this option.
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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 (gw_ip.s_addr) {
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struct sockaddr dst, gw, mask;
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/* Destination: (default) */
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bzero((caddr_t)&dst, 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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bzero((caddr_t)&gw, sizeof(gw));
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sin = (struct sockaddr_in *)&gw;
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sin->sin_len = sizeof(gw);
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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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bzero(&mask, sizeof(mask));
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printf("nfs_boot: gateway=0x%x\n", ntohl(gw_ip.s_addr));
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/* add, dest, gw, mask, flags, 0 */
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error = rtrequest(RTM_ADD, &dst, (struct sockaddr *)&gw,
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&mask, (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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}
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#endif
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get_path_and_handle(&bp_sin, "root", &nd->nd_root);
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get_path_and_handle(&bp_sin, "swap", &nd->nd_swap);
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return (0);
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}
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static void
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get_path_and_handle(bpsin, key, ndmntp)
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struct sockaddr_in *bpsin; /* bootparam server */
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char *key; /* root or swap */
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struct nfs_dlmount *ndmntp; /* output */
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{
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char pathname[MAXPATHLEN];
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char *sp, *dp, *endp;
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int error;
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/*
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* Get server:pathname for "key" (root or swap)
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* using RPC to bootparam/getfile
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*/
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error = bp_getfile(bpsin, key, &ndmntp->ndm_saddr,
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ndmntp->ndm_host, pathname);
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if (error)
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panic("nfs_boot: bootparam get %s: %d", key, error);
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/*
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* Get file handle for "key" (root or swap)
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* using RPC to mountd/mount
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*/
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error = md_mount(&ndmntp->ndm_saddr, pathname, ndmntp->ndm_fh);
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if (error)
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panic("nfs_boot: mountd %s, error=%d", key, error);
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/* Construct remote path (for getmntinfo(3)) */
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dp = ndmntp->ndm_host;
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endp = dp + MNAMELEN - 1;
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dp += strlen(dp);
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*dp++ = ':';
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for (sp = pathname; *sp && dp < endp;)
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*dp++ = *sp++;
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*dp = '\0';
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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, msg_len;
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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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msg_len = fxdr_unsigned(u_int32_t, reply->encap_len);
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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, md_sin, serv_name, pathname)
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struct sockaddr_in *bpsin;
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char *key;
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struct sockaddr_in *md_sin;
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char *serv_name;
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char *pathname;
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{
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struct mbuf *m;
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struct sockaddr_in *sin;
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struct in_addr inaddr;
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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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sn_len = MNAMELEN-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 = MAXPATHLEN-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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/* setup server socket address */
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sin = md_sin;
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bzero((caddr_t)sin, 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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/* 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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/*
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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, fhp)
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struct sockaddr_in *mdsin; /* mountd server address */
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char *path;
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u_char *fhp;
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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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u_int8_t fh[NFS_FHSIZE];
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} *rdata;
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|
struct mbuf *m;
|
|
int error;
|
|
|
|
/* Get port number for MOUNTD. */
|
|
error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
|
|
&mdsin->sin_port);
|
|
if (error) return error;
|
|
|
|
m = xdr_string_encode(path, strlen(path));
|
|
if (m == NULL)
|
|
return (ENOMEM);
|
|
|
|
/* Do RPC to mountd. */
|
|
error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
|
|
RPCMNT_MOUNT, &m, NULL);
|
|
if (error)
|
|
return error; /* message already freed */
|
|
|
|
if (m->m_len < sizeof(*rdata)) {
|
|
m = m_pullup(m, sizeof(*rdata));
|
|
if (m == NULL)
|
|
goto bad;
|
|
}
|
|
rdata = mtod(m, struct rdata *);
|
|
error = fxdr_unsigned(u_int32_t, rdata->errno);
|
|
if (error)
|
|
goto out;
|
|
bcopy(rdata->fh, fhp, NFS_FHSIZE);
|
|
|
|
/* Set port number for NFS use. */
|
|
error = krpc_portmap(mdsin, NFS_PROG, NFS_VER2,
|
|
&mdsin->sin_port);
|
|
goto out;
|
|
|
|
bad:
|
|
error = EBADRPC;
|
|
|
|
out:
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
|
|
#endif /* NETHER */
|