freebsd-skq/sys/nfsclient/nfs_diskless.c
phk 8eb928cd77 Remove the magic way of configuring NFS backed swap.
This code dates back to the very first diskless support on FreeBSD,
back when swapon(8) couldn't simply be run on a NFS backed file.

Suggested replacement command sequence on the client:

        dd if=/dev/zero of=/swapfile bs=1k count=1 oseek=100000
        swapon /swapfile
        rm -f /swapfile

For whatever value of 100000 you want.
2003-08-15 12:04:02 +00:00

237 lines
6.7 KiB
C

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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 University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfsclient/nfsdiskless.h>
static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
static int decode_nfshandle(char *ev, u_char *fh);
/*
* Populate the essential fields in the nfsv3_diskless structure.
*
* The loader is expected to export the following environment variables:
*
* boot.netif.ip IP address on boot interface
* boot.netif.netmask netmask on boot interface
* boot.netif.gateway default gateway (optional)
* boot.netif.hwaddr hardware address of boot interface
* boot.nfsroot.server IP address of root filesystem server
* boot.nfsroot.path path of the root filesystem on server
* boot.nfsroot.nfshandle NFS handle for root filesystem on server
*/
void
nfs_setup_diskless(void)
{
struct nfs_diskless *nd = &nfs_diskless;
struct ifnet *ifp;
struct ifaddr *ifa;
struct sockaddr_dl *sdl, ourdl;
struct sockaddr_in myaddr, netmask;
char *cp;
if (nfs_diskless_valid)
return;
/* set up interface */
if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
return;
if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
printf("nfs_diskless: no netmask\n");
return;
}
bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
printf("nfs_diskless: no hardware address\n");
return;
}
ifa = NULL;
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if ((ifa->ifa_addr->sa_family == AF_LINK) &&
(sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) {
if ((sdl->sdl_type == ourdl.sdl_type) &&
(sdl->sdl_alen == ourdl.sdl_alen) &&
!bcmp(sdl->sdl_data + sdl->sdl_nlen,
ourdl.sdl_data + ourdl.sdl_nlen,
sdl->sdl_alen)) {
IFNET_RUNLOCK();
goto match_done;
}
}
}
}
IFNET_RUNLOCK();
printf("nfs_diskless: no interface\n");
return; /* no matching interface */
match_done:
sprintf(nd->myif.ifra_name, "%s%d", ifp->if_name, ifp->if_unit);
/* set up gateway */
inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
/* set up root mount */
nd->root_args.rsize = 8192; /* XXX tunable? */
nd->root_args.wsize = 8192;
nd->root_args.sotype = SOCK_DGRAM;
nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
printf("nfs_diskless: no server\n");
return;
}
nd->root_saddr.sin_port = htons(NFS_PORT);
if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
printf("nfs_diskless: no NFS handle\n");
return;
}
if ((cp = getenv("boot.nfsroot.path")) != NULL) {
strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
freeenv(cp);
}
nfs_diskless_valid = 1;
}
static int
inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
{
u_int32_t a[4];
char *cp;
int count;
bzero(sa, sizeof(*sa));
sa->sin_len = sizeof(*sa);
sa->sin_family = AF_INET;
if ((cp = getenv(ev)) == NULL)
return (1);
count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
freeenv(cp);
if (count != 4)
return (1);
sa->sin_addr.s_addr =
htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
return (0);
}
static int
hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
{
char *cp;
u_int32_t a[6];
int count;
bzero(sa, sizeof(*sa));
sa->sdl_len = sizeof(*sa);
sa->sdl_family = AF_LINK;
sa->sdl_type = IFT_ETHER;
sa->sdl_alen = ETHER_ADDR_LEN;
if ((cp = getenv(ev)) == NULL)
return (1);
count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
&a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
freeenv(cp);
if (count != 6)
return (1);
sa->sdl_data[0] = a[0];
sa->sdl_data[1] = a[1];
sa->sdl_data[2] = a[2];
sa->sdl_data[3] = a[3];
sa->sdl_data[4] = a[4];
sa->sdl_data[5] = a[5];
return (0);
}
static int
decode_nfshandle(char *ev, u_char *fh)
{
u_char *cp, *ep;
int len, val;
ep = cp = getenv(ev);
if (cp == NULL)
return (0);
if ((strlen(cp) < 2) || (*cp != 'X')) {
freeenv(ep);
return (0);
}
len = 0;
cp++;
for (;;) {
if (*cp == 'X') {
freeenv(ep);
return (len);
}
if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
freeenv(ep);
return (0);
}
*(fh++) = val;
len++;
cp += 2;
if (len > NFSX_V2FH) {
freeenv(ep);
return (0);
}
}
}