NetBSD/sys/nfs/nfs_bootparam.c

489 lines
13 KiB
C

/* $NetBSD: nfs_bootparam.c,v 1.4 1997/12/12 21:09:49 gwr Exp $ */
/*-
* Copyright (c) 1995, 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Glass and Gordon W. Ross.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Support for NFS diskless booting, Sun-style (RPC/bootparams)
*/
#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/krpc.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsproto.h>
#include <nfs/nfsdiskless.h>
/*
* There are two implementations of NFS diskless boot.
* This implementation uses Sun RPC/bootparams, and the
* the other uses BOOTP (RFC951 - see nfs_bootdhcp.c).
*
* The Sun-style boot sequence goes as follows:
* (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
*/
/* bootparam RPC */
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));
/*
* Get client name, gateway address, then
* get root and swap server:pathname info.
* RPCs: bootparam/whoami, bootparam/getfile
*
* 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.
*/
int
nfs_bootparam(ifp, nd, procp)
struct ifnet *ifp;
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 socket *so;
struct nfs_dlmount *gw_ndm;
#if 0 /* XXX - not yet */
char *p;
u_int32_t mask;
#endif /* XXX */
int error;
gw_ndm = 0;
bzero(&ireq, sizeof(ireq));
bcopy(ifp->if_xname, ireq.ifr_name, IFNAMSIZ);
/*
* Get a socket to use for various things in here.
* After this, use "goto out" to cleanup and return.
*/
error = socreate(AF_INET, &so, SOCK_DGRAM, 0);
if (error) {
printf("nfs_boot: socreate, error=%d\n", error);
return (error);
}
/*
* Bring up the interface. (just set the "up" flag)
* Get the old interface flags and or IFF_UP into them so
* things like media selection flags are not clobbered.
*/
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;
}
/*
* Do RARP for the interface address.
*/
error = revarpwhoami(&my_ip, ifp);
if (error) {
printf("revarp failed, error=%d\n", error);
goto out;
}
nd->nd_myip.s_addr = my_ip.s_addr;
printf("nfs_boot: client_addr=0x%x\n",
(u_int32_t)ntohl(my_ip.s_addr));
/*
* 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;
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr = my_ip;
error = ifioctl(so, SIOCSIFADDR, (caddr_t)&ireq, procp);
if (error) {
printf("nfs_boot: set ifaddr, error=%d\n", error);
goto out;
}
/*
* Get client name and gateway address.
* RPC: bootparam/whoami
* 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.
*/
sin = &bp_sin;
bzero((caddr_t)sin, sizeof(*sin));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_BROADCAST;
/* Do the RPC/bootparam/whoami. */
error = bp_whoami(sin, &my_ip, &gw_ip);
if (error) {
printf("nfs_boot: bootparam whoami, error=%d\n", error);
goto out;
}
printf("nfs_boot: server_addr=0x%x\n",
(u_int32_t)ntohl(sin->sin_addr.s_addr));
printf("nfs_boot: hostname=%s\n", hostname);
/*
* Now fetch the server:pathname strings and server IP
* for root and swap. Missing swap is not fatal.
*/
error = bp_getfile(sin, "root", &nd->nd_root);
if (error) {
printf("nfs_boot: bootparam get root: %d\n", error);
goto out;
}
#if 0
error = bp_getfile(sin, "swap", &nd->nd_swap);
if (error) {
printf("nfs_boot: bootparam get swap: %d\n", error);
error = 0;
}
#endif
#ifdef NFS_BOOT_GATEWAY
/*
* Note: we normally ignore the gateway address returned
* by the "bootparam/whoami" RPC above, because many old
* bootparam servers supply a bogus gateway value.
*
* These deficiencies in the bootparam RPC interface are
* circumvented by using the bootparam/getfile RPC. The
* parameter "gateway" is requested, and if its returned,
* we use the "server" part of the reply as the gateway,
* and use the "pathname" part of the reply as the mask.
* (The mask comes to us as a string.)
*/
if (gw_ip.s_addr) {
/* Our caller will add the route. */
nd->nd_gwip = gw_ip;
}
#endif
#if 0 /* XXX - not yet */
gw_ndm = malloc(sizeof(*gw_ndm), M_NFSMNT, M_WAITOK);
bzero((caddr_t)gw_ndm, sizeof(*gw_ndm));
error = bp_getfile(sin, "gateway", gw_ndm);
if (error) {
/* Ignore the error. No gateway supplied. */
error = 0;
goto out;
}
printf("nfs_boot: gateway=%s\n", gw_ndm->ndm_host);
sin = (struct sockaddr_in *) &gw_ndm->ndm_saddr;
nd->nd_gwip = sin->sin_addr;
/* Find the pathname part of the "mounted-on" string. */
p = strchr(gw_ndm->ndm_host, ':');
if (p == 0)
goto out;
/* have pathname */
p++; /* skip ':' */
mask = inet_addr(p); /* libkern */
if (mask == 0) {
printf("nfs_boot: gateway netmask missing\n");
goto out;
}
/* Save our netmask and update the network interface. */
nd->nd_mask.s_addr = mask;
sin = (struct sockaddr_in *)&ireq.ifr_addr;
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr = nd->nd_mask;
error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)&ireq, procp);
if (error) {
printf("nfs_boot: set ifmask, error=%d\n", error);
error = 0; /* ignore it */
}
#endif /* XXX */
out:
if (gw_ndm)
free(gw_ndm, M_NFSMNT);
soclose(so);
return (error);
}
/*
* RPC: bootparam/whoami
* Given client IP address, get:
* client name (hostname)
* domain name (domainname)
* gateway address
*
* 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
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;
bad:
printf("nfs_boot: bootparam_whoami: bad reply\n");
error = EBADRPC;
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)
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;
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;
bad:
printf("nfs_boot: bootparam_getfile: bad reply\n");
error = EBADRPC;
out:
m_freem(m);
return(0);
}