672 lines
18 KiB
C
672 lines
18 KiB
C
/* $NetBSD: nfs_bootdhcp.c,v 1.1 1997/08/29 16:10:31 gwr Exp $ */
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/*-
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* Copyright (c) 1995, 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Adam Glass and Gordon W. Ross.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Support for NFS diskless booting with BOOTP (RFC951, RFC1048)
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*
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* History:
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*
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* Tor Egge developed the initial version of this code based on
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* the Sun RPC/bootparam sources nfs_boot.c and krpc_subr.c and
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* submitted that work to NetBSD as bugreport "kern/2351" on
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* 29 Apr 1996.
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*
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* Gordon Ross reorganized Tor's version into this form and
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* integrated it into the NetBSD sources during Aug 1997.
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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/device.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/if_arp.h> /* ARPHRD_ETHER, etc. */
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#include <net/if_dl.h>
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#include <net/if_ether.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/if_inarp.h>
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#include <nfs/nfsproto.h>
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/* #include <nfs/nfs.h> */
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#include <nfs/nfsdiskless.h>
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/*
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* There are two implementations of NFS diskless boot.
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* This implementation uses BOOTP (RFC951, RFC1048), and
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* the other uses Sun RPC/bootparams (nfs_bootparam.c).
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*
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* This method gets everything it needs with one BOOTP
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* request and reply. Note that this actually uses only
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* the old BOOTP functionality subset of DHCP. It is not
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* clear that DHCP provides any advantage over BOOTP for
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* diskless boot. DHCP allows the server to assign an IP
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* address without any a-priori knowledge of the client,
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* but we require that the server has a-priori knowledge
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* of the client so it can export our (unique) NFS root.
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* Given that the server needs a-priori knowledge about
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* the client anyway, it might as well assign a fixed IP
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* address for the client and support BOOTP.
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*
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* On the other hand, disk-FULL clients may use DHCP, but
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* in that case the DHCP client should be user-mode code,
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* and has no bearing on the code below. -gwr
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*/
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/* Begin stuff from bootp.h */
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/* Definitions from RFC951 */
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#define BP_CHADDR_LEN 16
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#define BP_SNAME_LEN 64
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#define BP_FILE_LEN 128
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#define BP_VEND_LEN 64
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struct bootp {
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u_int8_t bp_op; /* packet opcode type */
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u_int8_t bp_htype; /* hardware addr type */
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u_int8_t bp_hlen; /* hardware addr length */
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u_int8_t bp_hops; /* gateway hops */
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u_int32_t bp_xid; /* transaction ID */
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u_int16_t bp_secs; /* seconds since boot began */
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u_int16_t bp_flags; /* RFC1532 broadcast, etc. */
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struct in_addr bp_ciaddr; /* client IP address */
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struct in_addr bp_yiaddr; /* 'your' IP address */
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struct in_addr bp_siaddr; /* server IP address */
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struct in_addr bp_giaddr; /* gateway IP address */
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u_int8_t bp_chaddr[BP_CHADDR_LEN]; /* client hardware address */
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char bp_sname[BP_SNAME_LEN]; /* server host name */
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char bp_file[BP_FILE_LEN]; /* boot file name */
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u_int8_t bp_vend[BP_VEND_LEN]; /* RFC1048 options */
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/*
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* Note that BOOTP packets are allowed to be longer
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* (see RFC 1532 sect. 2.1) and common practice is to
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* allow the option data in bp_vend to extend into the
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* additional space provided in longer packets.
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*/
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};
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#define IPPORT_BOOTPS 67
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#define IPPORT_BOOTPC 68
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#define BOOTREQUEST 1
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#define BOOTREPLY 2
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/*
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* Is this available from the sockaddr_dl somehow?
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* Perhaps (struct arphdr)->ar_hrd = ARPHRD_ETHER?
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* The interface has ->if_type but not the ARP fmt.
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*/
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#define HTYPE_ETHERNET 1
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/*
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* Vendor magic cookie (v_magic) for RFC1048
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*/
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static const u_int8_t vm_rfc1048[4] = { 99, 130, 83, 99 };
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/*
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* Tag values used to specify what information is being supplied in
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* the vendor (options) data area of the packet.
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*/
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/* RFC 1048 */
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#define TAG_END ((unsigned char) 255)
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#define TAG_PAD ((unsigned char) 0)
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#define TAG_SUBNET_MASK ((unsigned char) 1)
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#define TAG_TIME_OFFSET ((unsigned char) 2)
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#define TAG_GATEWAY ((unsigned char) 3)
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#define TAG_TIME_SERVER ((unsigned char) 4)
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#define TAG_NAME_SERVER ((unsigned char) 5)
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#define TAG_DOMAIN_SERVER ((unsigned char) 6)
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#define TAG_LOG_SERVER ((unsigned char) 7)
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#define TAG_COOKIE_SERVER ((unsigned char) 8)
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#define TAG_LPR_SERVER ((unsigned char) 9)
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#define TAG_IMPRESS_SERVER ((unsigned char) 10)
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#define TAG_RLP_SERVER ((unsigned char) 11)
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#define TAG_HOST_NAME ((unsigned char) 12)
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#define TAG_BOOT_SIZE ((unsigned char) 13)
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/* RFC 1395 */
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#define TAG_DUMP_FILE ((unsigned char) 14)
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#define TAG_DOMAIN_NAME ((unsigned char) 15)
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#define TAG_SWAP_SERVER ((unsigned char) 16)
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#define TAG_ROOT_PATH ((unsigned char) 17)
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/* End of stuff from bootp.h */
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/*
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* The "extended" size is somewhat arbitrary, but is
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* constrained by the maximum message size specified
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* by RFC1533 (567 total). This value increases the
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* space for options from 64 bytes to 256 bytes.
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*/
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#define BOOTP_SIZE_MAX (sizeof(struct bootp)+192)
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#define BOOTP_SIZE_MIN (sizeof(struct bootp))
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/*
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* What is the longest we will wait before re-sending a request?
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* Note this is also the frequency of "BOOTP timeout" messages.
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* The re-send loop counts up linearly to this maximum, so the
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* first complaint will happen after (1+2+3+4+5)=15 seconds.
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*/
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#define MAX_RESEND_DELAY 5 /* seconds */
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#define TOTAL_TIMEOUT 30 /* seconds */
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/* Convenience macro */
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#define INTOHL(ina) ((u_int32_t)ntohl((ina).s_addr))
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static int bootpc_call __P((struct socket *, struct ifnet *,
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struct nfs_diskless *, struct proc *));
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/* #define DEBUG XXX */
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#ifdef DEBUG
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#define DPRINT(s) printf("nfs_boot: %s\n", s)
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#else
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#define DPRINT(s) (void)0
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#endif
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/*
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* Get our boot parameters using BOOTP.
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*/
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int
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nfs_bootdhcp(ifp, nd, procp)
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struct ifnet *ifp;
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struct nfs_diskless *nd;
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struct proc *procp;
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{
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struct ifaliasreq iareq;
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struct socket *so;
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struct sockaddr_in *sin;
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int error;
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/*
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* Get a socket to use for various things in here.
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* After this, use "goto out" to cleanup and return.
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*/
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error = socreate(AF_INET, &so, SOCK_DGRAM, 0);
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if (error) {
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printf("nfs_boot: socreate, error=%d\n", error);
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return (error);
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}
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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. Use address zero for now.
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*/
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bzero(&iareq, sizeof(iareq));
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bcopy(ifp->if_xname, iareq.ifra_name, IFNAMSIZ);
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/* Set the I/F address */
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sin = (struct sockaddr_in *)&iareq.ifra_addr;
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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 = INADDR_ANY;
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/* Leave subnetmask unspecified (len=0) */
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/* Set the broadcast addr. */
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sin = (struct sockaddr_in *)&iareq.ifra_broadaddr;
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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 = INADDR_BROADCAST;
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error = ifioctl(so, SIOCAIFADDR, (caddr_t)&iareq, procp);
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if (error) {
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printf("nfs_boot: set ifaddr zero, error=%d\n", error);
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goto out;
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}
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/* This function call does the real send/recv work. */
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error = bootpc_call(so, ifp, nd, procp);
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/* Get rid of the temporary (zero) IP address. */
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(void) ifioctl(so, SIOCDIFADDR, (caddr_t)&iareq, procp);
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/* NOW we can test the error from bootpc_call. */
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if (error)
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goto out;
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/*
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* Do ifconfig with our real IP address and mask.
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*/
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/* I/F address */
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sin = (struct sockaddr_in *)&iareq.ifra_addr;
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sin->sin_addr = nd->nd_myip;
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/* subnetmask */
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if (nd->nd_mask.s_addr) {
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sin = (struct sockaddr_in *)&iareq.ifra_mask;
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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 = nd->nd_mask;
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}
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/* Let ifioctl() default the broadcast address. */
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sin = (struct sockaddr_in *)&iareq.ifra_broadaddr;
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sin->sin_len = 0;
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sin->sin_family = 0;
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sin->sin_addr.s_addr = 0;
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error = ifioctl(so, SIOCAIFADDR, (caddr_t)&iareq, procp);
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if (error) {
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printf("nfs_boot: set ifaddr real, error=%d\n", error);
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goto out;
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}
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out:
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soclose(so);
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return (error);
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}
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static int
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bootpc_call(so, ifp, nd, procp)
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struct socket *so;
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struct ifnet *ifp;
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struct nfs_diskless *nd;
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struct proc *procp;
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{
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static u_int32_t xid = ~0xFF;
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struct uio uio;
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struct iovec iov;
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struct in_addr netmask;
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struct in_addr gateway;
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char *myname; /* my hostname */
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char *mydomain; /* my domainname */
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char *rootpath;
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int mynamelen;
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int mydomainlen;
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int rootpathlen;
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struct bootp *bootp; /* request and reply */
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struct mbuf *m, *nam;
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struct sockaddr_in *sin;
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int error, rcvflg, timo, secs, waited;
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int sendlen, recvlen;
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u_int tag, len;
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u_char *p, *limit;
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u_char *haddr;
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u_char hafmt, halen;
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/*
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* Initialize to NULL anything that will hold an allocation,
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* and free each at the end if not null.
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*/
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bootp = NULL;
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m = nam = NULL;
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/* Record our H/W (Ethernet) address. */
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{ struct sockaddr_dl *sdl = ifp->if_sadl;
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hafmt = HTYPE_ETHERNET; /* XXX: sdl->sdl_type? */
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halen = sdl->sdl_alen;
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haddr = (unsigned char *)LLADDR(sdl);
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}
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/*
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* Skip the route table when sending on this socket.
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* If this is not done, ip_output finds the loopback
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* interface (why?) and then fails because broadcast
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* is not supported on that interface...
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*/
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{ int32_t *opt;
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m = m_get(M_WAIT, MT_SOOPTS);
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opt = mtod(m, int32_t *);
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m->m_len = sizeof(*opt);
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*opt = 1;
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error = sosetopt(so, SOL_SOCKET, SO_DONTROUTE, m);
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m = NULL; /* was consumed */
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}
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if (error) {
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DPRINT("SO_DONTROUTE");
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goto out;
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}
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/* Enable broadcast. */
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{ int32_t *opt;
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m = m_get(M_WAIT, MT_SOOPTS);
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opt = mtod(m, int32_t *);
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m->m_len = sizeof(*opt);
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*opt = 1;
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error = sosetopt(so, SOL_SOCKET, SO_BROADCAST, m);
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m = NULL; /* was consumed */
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}
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if (error) {
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DPRINT("SO_BROADCAST");
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goto out;
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}
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/* Set the receive timeout for the socket. */
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{ struct timeval *tv;
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m = m_get(M_WAIT, MT_SOOPTS);
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tv = mtod(m, struct timeval *);
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m->m_len = sizeof(*tv);
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tv->tv_sec = 1;
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tv->tv_usec = 0;
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error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m);
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m = NULL; /* was consumed */
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}
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if (error) {
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DPRINT("SO_RCVTIMEO");
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goto out;
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}
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/*
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* Bind the local endpoint to a bootp client port.
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*/
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m = m_getclr(M_WAIT, MT_SONAME);
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sin = mtod(m, struct sockaddr_in *);
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sin->sin_len = m->m_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = INADDR_ANY;
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sin->sin_port = htons(IPPORT_BOOTPC);
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error = sobind(so, m);
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m_freem(m);
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if (error) {
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DPRINT("bind failed\n");
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goto out;
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}
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/*
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* Setup socket address for the server.
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*/
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nam = m_get(M_WAIT, MT_SONAME);
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sin = mtod(nam, struct sockaddr_in *);
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sin->sin_len = nam->m_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = INADDR_BROADCAST;
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sin->sin_port = htons(IPPORT_BOOTPS);
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/*
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* Allocate buffer used for request/reply
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*/
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bootp = malloc(BOOTP_SIZE_MAX, M_DEVBUF, M_WAITOK);
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if (bootp == NULL)
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panic("nfs_boot: malloc buf");
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/*
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* Send it, repeatedly, until a reply is received,
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* but delay each re-send by an increasing amount.
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* If the delay hits the maximum, start complaining.
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* Try extended-length request first, and if that
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* results in total timeout, start over with the
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* standard-length BOOTP request.
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*/
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sendlen = BOOTP_SIZE_MAX;
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waited = timo = 0;
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send_again:
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waited += timo;
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if (waited >= TOTAL_TIMEOUT) {
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if (sendlen > BOOTP_SIZE_MIN) {
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sendlen = BOOTP_SIZE_MIN;
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waited = timo = 0;
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printf("nfs_boot: trying short requests\n");
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goto send_again;
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}
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error = ETIMEDOUT;
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goto out;
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}
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/* Determine new timeout. */
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if (timo < MAX_RESEND_DELAY)
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timo++;
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else
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printf("nfs_boot: BOOTP timeout...\n");
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/*
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* Build the BOOTP reqest message. Do it every time
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* we send a new request because we reuse the buffer.
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* Also, use a new transaction ID for each request.
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* Note: xid is host order! (opaque to server)
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*/
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bzero((caddr_t)bootp, BOOTP_SIZE_MAX);
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bootp->bp_op = BOOTREQUEST;
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bootp->bp_htype = hafmt;
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bootp->bp_hlen = halen; /* Hardware address length */
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bootp->bp_xid = ++xid;
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bootp->bp_secs = htons(waited);
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bcopy(haddr, bootp->bp_chaddr, halen);
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/* Fill-in the vendor data. */
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bcopy(vm_rfc1048, bootp->bp_vend, 4);
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bootp->bp_vend[4] = TAG_END;
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/*
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* The BOOTP request is complete. Send it.
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*/
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iov.iov_base = (caddr_t) bootp;
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iov.iov_len = sendlen;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_segflg = UIO_SYSSPACE;
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uio.uio_rw = UIO_WRITE;
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uio.uio_offset = 0;
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uio.uio_resid = sendlen;
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uio.uio_procp = procp;
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error = sosend(so, nam, &uio, NULL, NULL, 0);
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if (error) {
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printf("nfs_boot: sosend: %d\n", error);
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goto out;
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}
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|
|
/*
|
|
* Wait for up to timo seconds for a reply.
|
|
* The socket receive timeout was set to 1 second.
|
|
*/
|
|
secs = timo;
|
|
for (;;) {
|
|
iov.iov_base = (caddr_t) bootp;
|
|
iov.iov_len = BOOTP_SIZE_MAX;
|
|
uio.uio_iov = &iov;
|
|
uio.uio_iovcnt = 1;
|
|
uio.uio_segflg = UIO_SYSSPACE;
|
|
uio.uio_rw = UIO_READ;
|
|
uio.uio_offset = 0;
|
|
uio.uio_resid = BOOTP_SIZE_MAX;
|
|
uio.uio_procp = procp;
|
|
|
|
rcvflg = 0;
|
|
error = soreceive(so, NULL, &uio, NULL, NULL, &rcvflg);
|
|
if (error == EWOULDBLOCK) {
|
|
if (--secs <= 0)
|
|
goto send_again;
|
|
continue;
|
|
}
|
|
if (error)
|
|
goto out;
|
|
recvlen = BOOTP_SIZE_MAX - uio.uio_resid;
|
|
|
|
/*
|
|
* Is this a valid reply?
|
|
*/
|
|
if (recvlen < BOOTP_SIZE_MIN) {
|
|
DPRINT("short packet");
|
|
continue;
|
|
}
|
|
if (bootp->bp_op != BOOTREPLY) {
|
|
DPRINT("not reply");
|
|
continue;
|
|
}
|
|
if (bootp->bp_hlen != halen) {
|
|
DPRINT("bad hwa_len");
|
|
continue;
|
|
}
|
|
if (bcmp(bootp->bp_chaddr, haddr, halen)) {
|
|
DPRINT("wrong hwaddr");
|
|
continue;
|
|
}
|
|
if (bootp->bp_xid != xid) {
|
|
DPRINT("wrong xid");
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* OK, we have a valid reply.
|
|
* Decode the vendor data.
|
|
*/
|
|
if (bcmp(bootp->bp_vend, vm_rfc1048, 4)) {
|
|
printf("nfs_boot: reply missing options\n");
|
|
continue;
|
|
}
|
|
/* Default these to "unspecified". */
|
|
netmask.s_addr = 0;
|
|
gateway.s_addr = 0;
|
|
mydomain = myname = rootpath = NULL;
|
|
mydomainlen = mynamelen = rootpathlen = 0;
|
|
p = &bootp->bp_vend[4];
|
|
limit = ((char*)bootp) + recvlen;
|
|
while (p < limit) {
|
|
tag = *p++;
|
|
if (tag == TAG_END)
|
|
break;
|
|
if (tag == TAG_PAD)
|
|
continue;
|
|
len = *p++;
|
|
if (len == 0)
|
|
continue;
|
|
if ((p + len) > limit) {
|
|
printf("nfs_boot: option %d too long\n", tag);
|
|
break;
|
|
}
|
|
switch (tag) {
|
|
case TAG_SUBNET_MASK:
|
|
bcopy(p, &netmask, 4);
|
|
break;
|
|
case TAG_GATEWAY:
|
|
/* Routers */
|
|
bcopy(p, &gateway, 4);
|
|
break;
|
|
case TAG_HOST_NAME:
|
|
if (len >= sizeof(hostname)) {
|
|
printf("nfs_boot: host name >=%d bytes",
|
|
sizeof(hostname));
|
|
break;
|
|
}
|
|
myname = p;
|
|
mynamelen = len;
|
|
break;
|
|
case TAG_DOMAIN_NAME:
|
|
if (len >= sizeof(domainname)) {
|
|
printf("nfs_boot: domain name >=%d bytes",
|
|
sizeof(domainname));
|
|
break;
|
|
}
|
|
mydomain = p;
|
|
mydomainlen = len;
|
|
break;
|
|
case TAG_ROOT_PATH:
|
|
/* Leave some room for the server name. */
|
|
if (len >= (MNAMELEN-10)) {
|
|
printf("nfs_boot: rootpath >=%d bytes",
|
|
(MNAMELEN-10));
|
|
break;
|
|
}
|
|
rootpath = p;
|
|
rootpathlen = len;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
p += len;
|
|
}
|
|
|
|
if (rootpath == NULL) {
|
|
printf("nfs_boot: No root path offered\n");
|
|
continue;
|
|
}
|
|
|
|
/* OK, the reply has everything we need. */
|
|
break;
|
|
}
|
|
rootpath[rootpathlen] = '\0';
|
|
|
|
/*
|
|
* Store and print network config info.
|
|
*/
|
|
if (myname) {
|
|
myname[mynamelen] = '\0';
|
|
strncpy(hostname, myname, sizeof(hostname));
|
|
hostnamelen = mynamelen;
|
|
printf("nfs_boot: my_name=%s\n", hostname);
|
|
}
|
|
if (mydomain) {
|
|
mydomain[mydomainlen] = '\0';
|
|
strncpy(domainname, mydomain, sizeof(domainname));
|
|
domainnamelen = mydomainlen;
|
|
printf("nfs_boot: my_domain=%s\n", domainname);
|
|
}
|
|
nd->nd_myip = bootp->bp_yiaddr;
|
|
if (nd->nd_myip.s_addr)
|
|
printf("nfs_boot: my_addr=0x%x\n", INTOHL(nd->nd_myip));
|
|
nd->nd_mask = netmask;
|
|
if (nd->nd_mask.s_addr)
|
|
printf("nfs_boot: my_mask=0x%x\n", INTOHL(nd->nd_mask));
|
|
nd->nd_gwip = gateway;
|
|
if (nd->nd_gwip.s_addr)
|
|
printf("nfs_boot: gateway=0x%x\n", INTOHL(nd->nd_gwip));
|
|
|
|
/*
|
|
* Store the information about our NFS root mount.
|
|
* The caller will print it, so be silent here.
|
|
*/
|
|
{
|
|
struct nfs_dlmount *ndm = &nd->nd_root;
|
|
|
|
/* Server IP address. */
|
|
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 = bootp->bp_siaddr;
|
|
/* Server name. */
|
|
strncpy(ndm->ndm_host, bootp->bp_sname, BP_SNAME_LEN-1);
|
|
len = strlen(ndm->ndm_host);
|
|
if ((len + 1 + rootpathlen + 1) > sizeof(ndm->ndm_host)) {
|
|
/* Show the server IP address numerically. */
|
|
sprintf(ndm->ndm_host, "0x%8x",
|
|
INTOHL(bootp->bp_siaddr));
|
|
len = strlen(ndm->ndm_host);
|
|
}
|
|
ndm->ndm_host[len++] = ':';
|
|
strncpy(ndm->ndm_host + len,
|
|
rootpath, rootpathlen + 1);
|
|
}
|
|
error = 0;
|
|
|
|
out:
|
|
if (bootp)
|
|
free(bootp, M_DEVBUF);
|
|
if (nam)
|
|
m_freem(nam);
|
|
return (error);
|
|
}
|