NetBSD/sys/nfs/nfs_boot.c

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/* $NetBSD: nfs_boot.c,v 1.33 1997/05/27 23:37:39 gwr Exp $ */
/*
* Copyright (c) 1995 Adam Glass, Gordon Ross
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/reboot.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_ether.h>
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/krpc.h>
#include <nfs/xdr_subs.h>
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#include <nfs/nfs_var.h>
#include "ether.h"
#if NETHER == 0
int nfs_boot_init(nd, procp)
struct nfs_diskless *nd;
struct proc *procp;
{
printf("nfs_boot: NETHER == 0\n");
return (ENXIO);
}
int
nfs_boot_getfh(ndm)
struct nfs_dlmount *ndm;
{
return (ENXIO);
}
#else /* NETHER */
/*
* Support for NFS diskless booting, specifically getting information
* about where to boot from, what pathnames, etc.
*
* This implememtation uses RARP and the bootparam RPC.
* We are forced to implement RPC anyway (to get file handles)
* so we might as well take advantage of it for bootparam too.
*
* The diskless boot sequence goes as follows:
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* (1) Use RARP to get our interface address
* (2) Use RPC/bootparam/whoami to get our hostname,
* our IP address, and the server's IP address.
* (3) Use RPC/bootparam/getfile to get the root path
* (4) Use RPC/mountd to get the root file handle
* (5) Use RPC/bootparam/getfile to get the swap path
* (6) Use RPC/mountd to get the swap file handle
*
* (This happens to be the way Sun does it too.)
*/
/* bootparam RPC */
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static int bp_whoami __P((struct sockaddr_in *bpsin,
struct in_addr *my_ip, struct in_addr *gw_ip));
static int bp_getfile __P((struct sockaddr_in *bpsin, char *key,
struct nfs_dlmount *ndm));
/* mountd RPC */
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static int md_mount __P((struct sockaddr_in *mdsin, char *path,
struct nfs_args *argp));
/*
* Called with an empty nfs_diskless struct to be filled in.
*/
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int
nfs_boot_init(nd, procp)
struct nfs_diskless *nd;
struct proc *procp;
{
struct ifreq ireq;
struct in_addr my_ip, gw_ip;
struct sockaddr_in bp_sin;
struct sockaddr_in *sin;
struct ifnet *ifp;
struct socket *so;
int error;
/*
* Find an interface, rarp for its ip address, stuff it, the
* implied broadcast addr, and netmask into a nfs_diskless struct.
*
* This was moved here from nfs_vfsops.c because this procedure
* 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.)
*/
/*
* Find a network interface.
*/
ifp = ifunit(root_device->dv_xname);
if (ifp == NULL) {
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printf("nfs_boot: no suitable interface\n");
return (ENXIO);
}
bcopy(ifp->if_xname, ireq.ifr_name, IFNAMSIZ);
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printf("nfs_boot: using network interface '%s'\n",
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ireq.ifr_name);
/*
* Bring up the interface.
*
* Get the old interface flags and or IFF_UP into them; if
* IFF_UP set blindly, interface selection can be clobbered.
*/
so = 0;
error = socreate(AF_INET, &so, SOCK_DGRAM, 0);
if (error) {
printf("nfs_boot: socreate, error=%d\n", error);
so = 0;
goto out;
}
error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)&ireq, procp);
if (error) {
printf("nfs_boot: GIFFLAGS, error=%d\n", error);
goto out;
}
ireq.ifr_flags |= IFF_UP;
error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)&ireq, procp);
if (error) {
printf("nfs_boot: SIFFLAGS, error=%d\n", error);
goto out;
}
/*
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* Do RARP for the interface address.
*/
if ((error = revarpwhoami(&my_ip, ifp)) != 0) {
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printf("revarp failed, error=%d\n", error);
error = EIO; /* XXX */
goto out;
}
printf("nfs_boot: client_addr=0x%x\n",
(u_int32_t)ntohl(my_ip.s_addr));
/*
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* Do enough of ifconfig(8) so that the chosen interface
* can talk to the servers. (just set the address)
*/
sin = (struct sockaddr_in *)&ireq.ifr_addr;
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bzero((caddr_t)sin, sizeof(*sin));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = my_ip.s_addr;
error = ifioctl(so, SIOCSIFADDR, (caddr_t)&ireq, procp);
if (error) {
printf("nfs_boot: set if addr, error=%d\n", error);
goto out;
}
/*
* Get client name and gateway address.
* RPC: bootparam/whoami
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* Use the old broadcast address for the WHOAMI
* call because we do not yet know our netmask.
* The server address returned by the WHOAMI call
* is used for all subsequent booptaram RPCs.
*/
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bzero((caddr_t)&bp_sin, sizeof(bp_sin));
bp_sin.sin_len = sizeof(bp_sin);
bp_sin.sin_family = AF_INET;
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bp_sin.sin_addr.s_addr = INADDR_BROADCAST;
hostnamelen = MAXHOSTNAMELEN;
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/* Do the RPC/bootparam/whoami. */
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error = bp_whoami(&bp_sin, &my_ip, &gw_ip);
if (error) {
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printf("nfs_boot: bootparam whoami, error=%d\n", error);
goto out;
}
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printf("nfs_boot: server_addr=0x%x\n",
(u_int32_t)ntohl(bp_sin.sin_addr.s_addr));
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printf("nfs_boot: hostname=%s\n", hostname);
#ifdef NFS_BOOT_GATEWAY
/*
* XXX - This code is conditionally compiled only because
* many bootparam servers (in particular, SunOS 4.1.3)
* always set the gateway address to their own address.
* The bootparam server is not necessarily the gateway.
* We could just believe the server, and at worst you would
* need to delete the incorrect default route before adding
* the correct one, but for simplicity, ignore the gateway.
* If your server is OK, you can turn on this option.
*
* If the gateway address is set, add a default route.
* (The mountd RPCs may go across a gateway.)
*/
if (gw_ip.s_addr) {
struct sockaddr dst, gw, mask;
/* Destination: (default) */
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bzero((caddr_t)&dst, sizeof(dst));
dst.sa_len = sizeof(dst);
dst.sa_family = AF_INET;
/* Gateway: */
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bzero((caddr_t)&gw, sizeof(gw));
sin = (struct sockaddr_in *)&gw;
sin->sin_len = sizeof(gw);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = gw_ip.s_addr;
/* Mask: (zero length) */
bzero(&mask, sizeof(mask));
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printf("nfs_boot: gateway=0x%x\n", ntohl(gw_ip.s_addr));
/* add, dest, gw, mask, flags, 0 */
error = rtrequest(RTM_ADD, &dst, (struct sockaddr *)&gw,
&mask, (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
if (error)
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printf("nfs_boot: add route, error=%d\n", error);
}
#endif
bcopy(&bp_sin, &nd->nd_boot, sizeof(bp_sin));
/*
* Now fetch the server:pathname strings and server IP
* for root and swap. Missing swap is not fatal.
*/
error = bp_getfile(&nd->nd_boot, "root", &nd->nd_root);
if (error) {
printf("nfs_boot: bootparam get root: %d\n", error);
goto out;
}
error = bp_getfile(&nd->nd_boot, "swap", &nd->nd_swap);
if (error) {
printf("nfs_boot: bootparam get swap: %d", error);
error = 0;
}
out:
if (so) soclose(so);
return (error);
}
int
nfs_boot_getfh(ndm)
struct nfs_dlmount *ndm; /* output */
{
struct nfs_args *args;
struct sockaddr_in *sin;
char *pathname;
int error;
args = &ndm->ndm_args;
/* Initialize mount args. */
bzero((caddr_t) args, sizeof(*args));
args->addr = &ndm->ndm_saddr;
args->addrlen = args->addr->sa_len;
#ifdef NFS_BOOT_TCP
args->sotype = SOCK_STREAM;
#else
args->sotype = SOCK_DGRAM;
#endif
args->fh = ndm->ndm_fh;
args->hostname = ndm->ndm_host;
args->flags = NFSMNT_RESVPORT | NFSMNT_NFSV3;
#ifdef NFS_BOOT_OPTIONS
args->flags |= NFS_BOOT_OPTIONS;
#endif
#ifdef NFS_BOOT_RWSIZE
/*
* Reduce rsize,wsize for interfaces that consistently
* drop fragments of long UDP messages. (i.e. wd8003).
* You can always change these later via remount.
*/
args->flags |= NFSMNT_WSIZE | NFSMNT_RSIZE;
args->wsize = NFS_BOOT_RWSIZE;
args->rsize = NFS_BOOT_RWSIZE;
#endif
/*
* Find the pathname part of the "server:pathname"
* string left in ndm->ndm_host by nfs_boot_init.
*/
pathname = strchr(ndm->ndm_host, ':');
if (pathname == 0) {
printf("nfs_boot: getfh - no pathname\n");
return (EIO);
}
pathname++;
/*
* Get file handle using RPC to mountd/mount
*/
sin = (struct sockaddr_in *)&ndm->ndm_saddr;
error = md_mount(sin, pathname, args);
if (error) {
printf("nfs_boot: mountd `%s', error=%d\n",
ndm->ndm_host, error);
return (error);
}
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/* Set port number for NFS use. */
/* XXX: NFS port is always 2049, right? */
#ifdef NFS_BOOT_TCP
retry:
#endif
error = krpc_portmap(sin, NFS_PROG,
(args->flags & NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
(args->sotype == SOCK_STREAM) ? IPPROTO_TCP : IPPROTO_UDP,
&sin->sin_port);
if (sin->sin_port == htons(0))
error = EIO;
if (error) {
#ifdef NFS_BOOT_TCP
if (args->sotype == SOCK_STREAM) {
args->sotype = SOCK_DGRAM;
goto retry;
}
#endif
printf("nfs_boot: portmap NFS, error=%d\n", error);
}
return (error);
}
/*
* RPC: bootparam/whoami
* Given client IP address, get:
* client name (hostname)
* domain name (domainname)
* gateway address
*
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* The hostname and domainname are set here for convenience.
*
* Note - bpsin is initialized to the broadcast address,
* and will be replaced with the bootparam server address
* after this call is complete. Have to use PMAP_PROC_CALL
* to make sure we get responses only from a servers that
* know about us (don't want to broadcast a getport call).
*/
static int
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bp_whoami(bpsin, my_ip, gw_ip)
struct sockaddr_in *bpsin;
struct in_addr *my_ip;
struct in_addr *gw_ip;
{
/* RPC structures for PMAPPROC_CALLIT */
struct whoami_call {
u_int32_t call_prog;
u_int32_t call_vers;
u_int32_t call_proc;
u_int32_t call_arglen;
} *call;
struct callit_reply {
u_int32_t port;
u_int32_t encap_len;
/* encapsulated data here */
} *reply;
struct mbuf *m, *from;
struct sockaddr_in *sin;
int error, msg_len;
int16_t port;
/*
* Build request message for PMAPPROC_CALLIT.
*/
m = m_get(M_WAIT, MT_DATA);
call = mtod(m, struct whoami_call *);
m->m_len = sizeof(*call);
call->call_prog = txdr_unsigned(BOOTPARAM_PROG);
call->call_vers = txdr_unsigned(BOOTPARAM_VERS);
call->call_proc = txdr_unsigned(BOOTPARAM_WHOAMI);
/*
* append encapsulated data (client IP address)
*/
m->m_next = xdr_inaddr_encode(my_ip);
call->call_arglen = txdr_unsigned(m->m_next->m_len);
/* RPC: portmap/callit */
bpsin->sin_port = htons(PMAPPORT);
from = NULL;
error = krpc_call(bpsin, PMAPPROG, PMAPVERS,
PMAPPROC_CALLIT, &m, &from);
if (error)
return error;
/*
* Parse result message.
*/
if (m->m_len < sizeof(*reply)) {
m = m_pullup(m, sizeof(*reply));
if (m == NULL)
goto bad;
}
reply = mtod(m, struct callit_reply *);
port = fxdr_unsigned(u_int32_t, reply->port);
msg_len = fxdr_unsigned(u_int32_t, reply->encap_len);
m_adj(m, sizeof(*reply));
/*
* Save bootparam server address
*/
sin = mtod(from, struct sockaddr_in *);
bpsin->sin_port = htons(port);
bpsin->sin_addr.s_addr = sin->sin_addr.s_addr;
/* client name */
hostnamelen = MAXHOSTNAMELEN-1;
m = xdr_string_decode(m, hostname, &hostnamelen);
if (m == NULL)
goto bad;
/* domain name */
domainnamelen = MAXHOSTNAMELEN-1;
m = xdr_string_decode(m, domainname, &domainnamelen);
if (m == NULL)
goto bad;
/* gateway address */
m = xdr_inaddr_decode(m, gw_ip);
if (m == NULL)
goto bad;
/* success */
goto out;
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bad:
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printf("nfs_boot: bootparam_whoami: bad reply\n");
error = EBADRPC;
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out:
if (from)
m_freem(from);
if (m)
m_freem(m);
return(error);
}
/*
* RPC: bootparam/getfile
* Given client name and file "key", get:
* server name
* server IP address
* server pathname
*/
static int
bp_getfile(bpsin, key, ndm)
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struct sockaddr_in *bpsin;
char *key;
struct nfs_dlmount *ndm;
{
char pathname[MNAMELEN];
struct in_addr inaddr;
struct sockaddr_in *sin;
struct mbuf *m;
char *serv_name;
int error, sn_len, path_len;
/*
* Build request message.
*/
/* client name (hostname) */
m = xdr_string_encode(hostname, hostnamelen);
if (m == NULL)
return (ENOMEM);
/* key name (root or swap) */
m->m_next = xdr_string_encode(key, strlen(key));
if (m->m_next == NULL)
return (ENOMEM);
/* RPC: bootparam/getfile */
error = krpc_call(bpsin, BOOTPARAM_PROG, BOOTPARAM_VERS,
BOOTPARAM_GETFILE, &m, NULL);
if (error)
return error;
/*
* Parse result message.
*/
/* server name */
serv_name = &ndm->ndm_host[0];
sn_len = sizeof(ndm->ndm_host) - 1;
m = xdr_string_decode(m, serv_name, &sn_len);
if (m == NULL)
goto bad;
/* server IP address (mountd/NFS) */
m = xdr_inaddr_decode(m, &inaddr);
if (m == NULL)
goto bad;
/* server pathname */
path_len = sizeof(pathname) - 1;
m = xdr_string_decode(m, pathname, &path_len);
if (m == NULL)
goto bad;
/*
* Store the results in the nfs_dlmount.
* The strings become "server:pathname"
*/
sin = (struct sockaddr_in *) &ndm->ndm_saddr;
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bzero((caddr_t)sin, sizeof(*sin));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr = inaddr;
if ((sn_len + 1 + path_len + 1) > sizeof(ndm->ndm_host)) {
printf("nfs_boot: getfile name too long\n");
error = EIO;
goto out;
}
ndm->ndm_host[sn_len] = ':';
bcopy(pathname, ndm->ndm_host + sn_len + 1, path_len + 1);
/* success */
goto out;
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bad:
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printf("nfs_boot: bootparam_getfile: bad reply\n");
error = EBADRPC;
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out:
m_freem(m);
return(0);
}
/*
* RPC: mountd/mount
* Given a server pathname, get an NFS file handle.
* Also, sets sin->sin_port to the NFS service port.
*/
static int
md_mount(mdsin, path, argp)
struct sockaddr_in *mdsin; /* mountd server address */
char *path;
struct nfs_args *argp;
{
/* The RPC structures */
struct rdata {
u_int32_t errno;
union {
u_int8_t v2fh[NFSX_V2FH];
struct {
u_int32_t fhlen;
u_int8_t fh[1];
} v3fh;
} fh;
} *rdata;
struct mbuf *m;
u_int8_t *fh;
int minlen, error;
retry:
/* Get port number for MOUNTD. */
error = krpc_portmap(mdsin, RPCPROG_MNT,
(argp->flags & NFSMNT_NFSV3) ? RPCMNT_VER3 : RPCMNT_VER1,
IPPROTO_UDP, &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, (argp->flags & NFSMNT_NFSV3) ?
RPCMNT_VER3 : RPCMNT_VER1, RPCMNT_MOUNT, &m, NULL);
if (error) {
if ((error==RPC_PROGMISMATCH) && (argp->flags & NFSMNT_NFSV3)) {
argp->flags &= ~NFSMNT_NFSV3;
goto retry;
}
return error; /* message already freed */
}
/* The reply might have only the errno. */
if (m->m_len < 4)
goto bad;
/* Have at least errno, so check that. */
rdata = mtod(m, struct rdata *);
error = fxdr_unsigned(u_int32_t, rdata->errno);
if (error)
goto out;
/* Have errno==0, so the fh must be there. */
if (argp->flags & NFSMNT_NFSV3){
argp->fhsize = fxdr_unsigned(u_int32_t, rdata->fh.v3fh.fhlen);
if (argp->fhsize > NFSX_V3FHMAX)
goto bad;
minlen = 2 * sizeof(u_int32_t) + argp->fhsize;
} else {
argp->fhsize = NFSX_V2FH;
minlen = sizeof(u_int32_t) + argp->fhsize;
}
if (m->m_len < minlen) {
m = m_pullup(m, minlen);
if (m == NULL)
return(EBADRPC);
rdata = mtod(m, struct rdata *);
}
fh = (argp->flags & NFSMNT_NFSV3) ? rdata->fh.v3fh.fh : rdata->fh.v2fh;
bcopy(fh, argp->fh, argp->fhsize);
goto out;
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bad:
error = EBADRPC;
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out:
m_freem(m);
return error;
}
#endif /* NETHER */