438 lines
12 KiB
C
438 lines
12 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_bootp.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <net/ethernet.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <nfs/nfsproto.h>
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#include <nfsclient/nfs.h>
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#include <nfs/nfsdiskless.h>
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#define NFS_IFACE_TIMEOUT_SECS 10 /* Timeout for interface to appear. */
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static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
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static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
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static int decode_nfshandle(char *ev, u_char *fh, int maxfh);
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/*
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* This structure must be filled in by a primary bootstrap or bootstrap
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* server for a diskless/dataless machine. It is initialized below just
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* to ensure that it is allocated to initialized data (.data not .bss).
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*/
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struct nfs_diskless nfs_diskless = { { { 0 } } };
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struct nfsv3_diskless nfsv3_diskless = { { { 0 } } };
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int nfs_diskless_valid = 0;
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/*
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* Validate/sanity check a rsize/wsize parameter.
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*/
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static int
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checkrwsize(unsigned long v, const char *name)
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{
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/*
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* 32K is used as an upper bound because most servers
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* limit block size to satisfy IPv4's limit of
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* 64K/reassembled packet. The lower bound is pretty
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* much arbitrary.
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*/
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if (!(4 <= v && v <= 32*1024)) {
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printf("nfs_parse_options: invalid %s %lu ignored\n", name, v);
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return 0;
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} else
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return 1;
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}
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/*
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* Parse mount options and apply them to the supplied
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* nfs_diskless state. Used also by bootp/dhcp support.
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*/
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void
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nfs_parse_options(const char *envopts, struct nfs_args *nd)
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{
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char *opts, *o, *otmp;
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unsigned long v;
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opts = strdup(envopts, M_TEMP);
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otmp = opts;
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while ((o = strsep(&otmp, ":;, ")) != NULL) {
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if (*o == '\0')
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; /* Skip empty options. */
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else if (strcmp(o, "soft") == 0)
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nd->flags |= NFSMNT_SOFT;
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else if (strcmp(o, "intr") == 0)
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nd->flags |= NFSMNT_INT;
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else if (strcmp(o, "conn") == 0)
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nd->flags |= NFSMNT_NOCONN;
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else if (strcmp(o, "nolockd") == 0)
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nd->flags |= NFSMNT_NOLOCKD;
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else if (strcmp(o, "nocto") == 0)
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nd->flags |= NFSMNT_NOCTO;
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else if (strcmp(o, "nfsv2") == 0)
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nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4);
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else if (strcmp(o, "nfsv3") == 0) {
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nd->flags &= ~NFSMNT_NFSV4;
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nd->flags |= NFSMNT_NFSV3;
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} else if (strcmp(o, "tcp") == 0)
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nd->sotype = SOCK_STREAM;
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else if (strcmp(o, "udp") == 0)
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nd->sotype = SOCK_DGRAM;
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else if (strncmp(o, "rsize=", 6) == 0) {
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v = strtoul(o+6, NULL, 10);
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if (checkrwsize(v, "rsize")) {
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nd->rsize = (int) v;
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nd->flags |= NFSMNT_RSIZE;
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}
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} else if (strncmp(o, "wsize=", 6) == 0) {
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v = strtoul(o+6, NULL, 10);
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if (checkrwsize(v, "wsize")) {
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nd->wsize = (int) v;
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nd->flags |= NFSMNT_WSIZE;
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}
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} else
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printf("%s: skipping unknown option \"%s\"\n",
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__func__, o);
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}
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free(opts, M_TEMP);
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}
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/*
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* Populate the essential fields in the nfsv3_diskless structure.
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*
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* The loader is expected to export the following environment variables:
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*
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* boot.netif.name name of boot interface
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* boot.netif.ip IP address on boot interface
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* boot.netif.netmask netmask on boot interface
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* boot.netif.gateway default gateway (optional)
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* boot.netif.hwaddr hardware address of boot interface
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* boot.netif.mtu interface mtu from bootp/dhcp (optional)
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* boot.nfsroot.server IP address of root filesystem server
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* boot.nfsroot.path path of the root filesystem on server
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* boot.nfsroot.nfshandle NFS handle for root filesystem on server
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* boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only)
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* boot.nfsroot.options NFS options for the root filesystem
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*/
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void
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nfs_setup_diskless(void)
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{
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struct nfs_diskless *nd = &nfs_diskless;
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struct nfsv3_diskless *nd3 = &nfsv3_diskless;
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struct ifnet *ifp;
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struct ifaddr *ifa;
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struct sockaddr_dl *sdl, ourdl;
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struct sockaddr_in myaddr, netmask;
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char *cp;
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int cnt, fhlen, is_nfsv3;
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uint32_t len;
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time_t timeout_at;
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if (nfs_diskless_valid != 0)
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return;
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/* get handle size. If this succeeds, it's an NFSv3 setup. */
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if ((cp = kern_getenv("boot.nfsroot.nfshandlelen")) != NULL) {
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cnt = sscanf(cp, "%d", &len);
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freeenv(cp);
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if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) {
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printf("nfs_diskless: bad NFS handle len\n");
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return;
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}
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nd3->root_fhsize = len;
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is_nfsv3 = 1;
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} else
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is_nfsv3 = 0;
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/* set up interface */
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if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
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return;
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if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
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printf("nfs_diskless: no netmask\n");
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return;
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}
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if (is_nfsv3 != 0) {
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bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr));
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bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr));
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((struct sockaddr_in *)
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&nd3->myif.ifra_broadaddr)->sin_addr.s_addr =
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myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
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bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask));
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} else {
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bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
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bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
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((struct sockaddr_in *)
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&nd->myif.ifra_broadaddr)->sin_addr.s_addr =
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myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
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bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
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}
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if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
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printf("nfs_diskless: no hardware address\n");
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return;
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}
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ifa = NULL;
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timeout_at = time_uptime + NFS_IFACE_TIMEOUT_SECS;
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retry:
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CURVNET_SET(TD_TO_VNET(curthread));
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IFNET_RLOCK();
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TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
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TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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if (ifa->ifa_addr->sa_family == AF_LINK) {
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sdl = (struct sockaddr_dl *)ifa->ifa_addr;
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if ((sdl->sdl_type == ourdl.sdl_type) &&
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(sdl->sdl_alen == ourdl.sdl_alen) &&
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!bcmp(LLADDR(sdl),
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LLADDR(&ourdl),
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sdl->sdl_alen)) {
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IFNET_RUNLOCK();
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CURVNET_RESTORE();
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goto match_done;
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}
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}
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}
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}
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IFNET_RUNLOCK();
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CURVNET_RESTORE();
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if (time_uptime < timeout_at) {
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pause("nfssdl", hz / 5);
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goto retry;
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}
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printf("nfs_diskless: no interface\n");
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return; /* no matching interface */
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match_done:
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kern_setenv("boot.netif.name", ifp->if_xname);
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if (is_nfsv3 != 0) {
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strlcpy(nd3->myif.ifra_name, ifp->if_xname,
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sizeof(nd3->myif.ifra_name));
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/* set up gateway */
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inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway);
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/* set up root mount */
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nd3->root_args.rsize = 32768; /* XXX tunable? */
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nd3->root_args.wsize = 32768;
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nd3->root_args.sotype = SOCK_STREAM;
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nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE |
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NFSMNT_RSIZE | NFSMNT_RESVPORT);
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if (inaddr_to_sockaddr("boot.nfsroot.server",
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&nd3->root_saddr)) {
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printf("nfs_diskless: no server\n");
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return;
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}
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nd3->root_saddr.sin_port = htons(NFS_PORT);
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fhlen = decode_nfshandle("boot.nfsroot.nfshandle",
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&nd3->root_fh[0], NFSX_V3FHMAX);
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if (fhlen == 0) {
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printf("nfs_diskless: no NFS handle\n");
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return;
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}
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if (fhlen != nd3->root_fhsize) {
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printf("nfs_diskless: bad NFS handle len=%d\n", fhlen);
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return;
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}
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if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) {
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strncpy(nd3->root_hostnam, cp, MNAMELEN - 1);
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freeenv(cp);
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}
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if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) {
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nfs_parse_options(cp, &nd3->root_args);
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freeenv(cp);
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}
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nfs_diskless_valid = 3;
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} else {
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strlcpy(nd->myif.ifra_name, ifp->if_xname,
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sizeof(nd->myif.ifra_name));
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/* set up gateway */
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inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
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/* set up root mount */
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nd->root_args.rsize = 8192; /* XXX tunable? */
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nd->root_args.wsize = 8192;
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nd->root_args.sotype = SOCK_STREAM;
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nd->root_args.flags = (NFSMNT_WSIZE |
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NFSMNT_RSIZE | NFSMNT_RESVPORT);
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if (inaddr_to_sockaddr("boot.nfsroot.server",
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&nd->root_saddr)) {
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printf("nfs_diskless: no server\n");
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return;
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}
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nd->root_saddr.sin_port = htons(NFS_PORT);
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if (decode_nfshandle("boot.nfsroot.nfshandle",
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&nd->root_fh[0], NFSX_V2FH) == 0) {
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printf("nfs_diskless: no NFS handle\n");
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return;
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}
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if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) {
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strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
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freeenv(cp);
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}
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if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) {
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struct nfs_args args;
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/*
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* XXX yech, convert between old and current
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* arg format
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*/
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args.flags = nd->root_args.flags;
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args.sotype = nd->root_args.sotype;
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args.rsize = nd->root_args.rsize;
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args.wsize = nd->root_args.wsize;
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nfs_parse_options(cp, &args);
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nd->root_args.flags = args.flags;
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nd->root_args.sotype = args.sotype;
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nd->root_args.rsize = args.rsize;
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nd->root_args.wsize = args.wsize;
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freeenv(cp);
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}
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nfs_diskless_valid = 1;
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}
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}
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static int
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inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
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{
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u_int32_t a[4];
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char *cp;
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int count;
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bzero(sa, sizeof(*sa));
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sa->sin_len = sizeof(*sa);
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sa->sin_family = AF_INET;
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if ((cp = kern_getenv(ev)) == NULL)
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return (1);
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count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
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freeenv(cp);
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if (count != 4)
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return (1);
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sa->sin_addr.s_addr =
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htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
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return (0);
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}
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static int
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hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
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{
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char *cp;
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u_int32_t a[6];
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int count;
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bzero(sa, sizeof(*sa));
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sa->sdl_len = sizeof(*sa);
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sa->sdl_family = AF_LINK;
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sa->sdl_type = IFT_ETHER;
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sa->sdl_alen = ETHER_ADDR_LEN;
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if ((cp = kern_getenv(ev)) == NULL)
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return (1);
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count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
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&a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
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freeenv(cp);
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if (count != 6)
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return (1);
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sa->sdl_data[0] = a[0];
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sa->sdl_data[1] = a[1];
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sa->sdl_data[2] = a[2];
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sa->sdl_data[3] = a[3];
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sa->sdl_data[4] = a[4];
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sa->sdl_data[5] = a[5];
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return (0);
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}
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static int
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decode_nfshandle(char *ev, u_char *fh, int maxfh)
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{
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u_char *cp, *ep;
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int len, val;
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ep = cp = kern_getenv(ev);
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if (cp == NULL)
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return (0);
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if ((strlen(cp) < 2) || (*cp != 'X')) {
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freeenv(ep);
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return (0);
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}
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len = 0;
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cp++;
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for (;;) {
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if (*cp == 'X') {
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freeenv(ep);
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return (len);
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}
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if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
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freeenv(ep);
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return (0);
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}
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*(fh++) = val;
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len++;
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cp += 2;
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if (len > maxfh) {
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freeenv(ep);
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return (0);
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}
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}
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}
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#if !defined(BOOTP_NFSROOT)
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static void
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nfs_rootconf(void)
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{
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nfs_setup_diskless();
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if (nfs_diskless_valid)
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rootdevnames[0] = "nfs:";
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}
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SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
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#endif
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