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NetBSD/sys/kern/subr_tftproot.c

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/* $NetBSD: subr_tftproot.c,v 1.12 2012/12/01 11:41:50 mbalmer Exp $ */
/*-
* Copyright (c) 2007 Emmanuel Dreyfus, all rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Emmanuel Dreyfus
* 4. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR 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 AUTHOR 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.
*/
/*
* Download the root RAMdisk through TFTP at root mount time
*/
#include "opt_tftproot.h"
#include "opt_md.h"
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_tftproot.c,v 1.12 2012/12/01 11:41:50 mbalmer Exp $");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/lwp.h>
#include <sys/kmem.h>
#include <sys/mbuf.h>
#include <sys/timevar.h>
#include <sys/socketvar.h>
#include <net/if.h>
#include <dev/md.h>
#include <netinet/in.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsmount.h>
#include <nfs/nfsdiskless.h>
#include <nfs/nfs_var.h>
extern void mdattach(int);
/*
* Copied from <lib/libsa/tftp.h>
*/
#define SEGSIZE 512 /* data segment size */
/*
* Packet types.
*/
#define RRQ 01 /* read request */
#define WRQ 02 /* write request */
#define DATA 03 /* data packet */
#define ACK 04 /* acknowledgement */
#define ERROR 05 /* error code */
struct tftphdr {
short th_opcode; /* packet type */
union {
unsigned short tu_block; /* block # */
short tu_code; /* error code */
char tu_stuff[1]; /* request packet stuff */
} th_u;
char th_data[1]; /* data or error string */
} __packed;
#define th_block th_u.tu_block
#define th_code th_u.tu_code
#define th_stuff th_u.tu_stuff
#define th_msg th_data
#define IPPORT_TFTP 69
#ifdef TFTPROOT_DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
struct tftproot_handle {
struct nfs_diskless *trh_nd;
void *trh_base;
size_t trh_len;
unsigned short trh_block;
int trh_flags;
};
#define TRH_FINISHED 1
int tftproot_dhcpboot(device_t);
static int tftproot_getfile(struct tftproot_handle *, struct lwp *);
static int tftproot_recv(struct mbuf *, void *);
int
tftproot_dhcpboot(device_t bootdv)
{
struct nfs_diskless *nd = NULL;
struct ifnet *ifp = NULL;
struct lwp *l;
struct tftproot_handle trh;
device_t dv;
int error = -1;
if (rootspec != NULL) {
IFNET_FOREACH(ifp)
if (strcmp(rootspec, ifp->if_xname) == 0)
break;
}
if ((ifp == NULL) &&
(bootdv != NULL && device_class(bootdv) == DV_IFNET)) {
IFNET_FOREACH(ifp)
if (strcmp(device_xname(bootdv), ifp->if_xname) == 0)
break;
}
if (ifp == NULL) {
DPRINTF(("%s():%d ifp is NULL\n", __func__, __LINE__));
goto out;
}
dv = device_find_by_xname(ifp->if_xname);
if ((dv == NULL) || (device_class(dv) != DV_IFNET)) {
DPRINTF(("%s():%d cannot find device for interface %s\n",
__func__, __LINE__, ifp->if_xname));
goto out;
}
root_device = dv;
l = curlwp; /* XXX */
nd = kmem_zalloc(sizeof(*nd), KM_SLEEP);
nd->nd_ifp = ifp;
nd->nd_nomount = 1;
if ((error = nfs_boot_init(nd, l)) != 0) {
DPRINTF(("%s():%d nfs_boot_init returned %d\n",
__func__, __LINE__, error));
goto out;
}
/*
* Strip leading "tftp:"
*/
#define PREFIX "tftp:"
if (strstr(nd->nd_bootfile, PREFIX) == nd->nd_bootfile)
(void)memmove(nd->nd_bootfile,
nd->nd_bootfile + (sizeof(PREFIX) - 1),
sizeof(nd->nd_bootfile) - sizeof(PREFIX));
#undef PREFIX
printf("tftproot: bootfile=%s\n", nd->nd_bootfile);
memset(&trh, 0, sizeof(trh));
trh.trh_nd = nd;
trh.trh_block = 1;
if ((error = tftproot_getfile(&trh, l)) != 0) {
DPRINTF(("%s():%d tftproot_getfile returned %d\n",
__func__, __LINE__, error));
goto out;
}
error = 0;
out:
if (nd)
kmem_free(nd, sizeof(*nd));
return error;
}
static int
tftproot_getfile(struct tftproot_handle *trh, struct lwp *l)
{
struct socket *so = NULL;
struct mbuf *m_serv = NULL;
struct mbuf *m_outbuf = NULL;
struct sockaddr_in *sin;
struct tftphdr *tftp;
size_t packetlen, namelen;
int error = -1;
const char octetstr[] = "octet";
size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data);
char *cp;
if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL)) != 0) {
DPRINTF(("%s():%d socreate returned %d\n",
__func__, __LINE__, error));
goto out;
}
/*
* Set timeout
*/
if ((error = nfs_boot_setrecvtimo(so))) {
DPRINTF(("%s():%d SO_RCVTIMEO failed %d\n",
__func__, __LINE__, error));
goto out;
}
/*
* Set server address and port
*/
m_serv = m_get(M_WAIT, MT_SONAME);
m_serv->m_len = sizeof(*sin);
sin = mtod(m_serv, struct sockaddr_in *);
memcpy(sin, &trh->trh_nd->nd_root.ndm_saddr, sizeof(*sin));
sin->sin_port = htons(IPPORT_TFTP);
/*
* Set send buffer, prepare the TFTP packet
*/
namelen = strlen(trh->trh_nd->nd_bootfile) + 1;
packetlen = sizeof(tftp->th_opcode) + namelen + sizeof(octetstr);
if (packetlen > MSIZE) {
DPRINTF(("%s():%d boot filename too long (%ld bytes)\n",
__func__, __LINE__, (long)namelen));
goto out;
}
m_outbuf = m_gethdr(M_WAIT, MT_DATA);
m_clget(m_outbuf, M_WAIT);
m_outbuf->m_len = packetlen;
m_outbuf->m_pkthdr.len = packetlen;
m_outbuf->m_pkthdr.rcvif = NULL;
tftp = mtod(m_outbuf, struct tftphdr *);
memset(tftp, 0, packetlen);
tftp->th_opcode = htons((short)RRQ);
cp = tftp->th_stuff;
(void)strncpy(cp, trh->trh_nd->nd_bootfile, namelen);
cp += namelen;
(void)strncpy(cp, octetstr, sizeof(octetstr));
/*
* Perform the file transfer
*/
sin = (struct sockaddr_in *)&trh->trh_nd->nd_root.ndm_saddr;
printf("tftproot: download %s:%s ",
inet_ntoa(sin->sin_addr), trh->trh_nd->nd_bootfile);
do {
/*
* Show progress for every 200 blocks (100kB)
*/
#ifndef TFTPROOT_PROGRESS
#define TFTPROOT_PROGRESS 200
#endif
if ((trh->trh_block % TFTPROOT_PROGRESS) == 0)
twiddle();
/*
* Send the packet and receive the answer.
* We get the sender address here, which should be
* the same server with a different port
*/
if ((error = nfs_boot_sendrecv(so, m_serv, NULL, m_outbuf,
tftproot_recv, NULL, &m_serv, trh, l)) != 0) {
DPRINTF(("%s():%d sendrecv failed %d\n",
__func__, __LINE__, error));
goto out;
}
/*
* Accomodate the packet length for acks.
* This is really needed only on first pass
*/
m_outbuf->m_len = hdrlen;
m_outbuf->m_pkthdr.len = hdrlen;
tftp->th_opcode = htons((short)ACK);
tftp->th_block = htons(trh->trh_block);
/*
* Check for termination
*/
if (trh->trh_flags & TRH_FINISHED)
break;
trh->trh_block++;
} while (1/* CONSTCOND */);
printf("\n");
/*
* Ack the last block. so_send frees m_outbuf, therefore
* we do not want to free it ourselves.
* Ignore errors, as we already have the whole file.
*/
if ((error = (*so->so_send)(so, m_serv, NULL,
m_outbuf, NULL, 0, l)) != 0)
DPRINTF(("%s():%d tftproot: sosend returned %d\n",
__func__, __LINE__, error));
else
m_outbuf = NULL;
/*
* And use it as the root ramdisk.
*/
DPRINTF(("%s():%d RAMdisk loaded: %ld@%p\n",
__func__, __LINE__, trh->trh_len, trh->trh_base));
md_root_setconf(trh->trh_base, trh->trh_len);
mdattach(0);
error = 0;
out:
if (m_serv)
m_freem(m_serv);
if (m_outbuf)
m_freem(m_outbuf);
if (so)
soclose(so);
return error;
}
static int
tftproot_recv(struct mbuf *m, void *ctx)
{
struct tftproot_handle *trh = ctx;
struct tftphdr *tftp;
size_t newlen;
size_t hdrlen = sizeof(*tftp) - sizeof(tftp->th_data);
/*
* Check for short packet
*/
if (m->m_pkthdr.len < hdrlen) {
DPRINTF(("%s():%d short reply (%d bytes)\n",
__func__, __LINE__, m->m_pkthdr.len));
return -1;
}
/*
* Check for packet too large for being a TFTP packet
*/
if (m->m_pkthdr.len > hdrlen + SEGSIZE) {
DPRINTF(("%s():%d packet too big (%d bytes)\n",
__func__, __LINE__, m->m_pkthdr.len));
return -1;
}
/*
* Examine the TFTP header
*/
if (m->m_len > sizeof(*tftp)) {
if ((m = m_pullup(m, sizeof(*tftp))) == NULL) {
DPRINTF(("%s():%d m_pullup failed\n",
__func__, __LINE__));
return -1;
}
}
tftp = mtod(m, struct tftphdr *);
/*
* We handle data or error
*/
switch(ntohs(tftp->th_opcode)) {
case DATA:
break;
case ERROR: {
char errbuf[SEGSIZE + 1];
int i;
for (i = 0; i < SEGSIZE; i++) {
if ((tftp->th_data[i] < ' ') ||
(tftp->th_data[i] > '~')) {
errbuf[i] = '\0';
break;
}
errbuf[i] = tftp->th_data[i];
}
errbuf[SEGSIZE] = '\0';
printf("tftproot: TFTP server returned error %d, %s\n",
ntohs(tftp->th_code), errbuf);
return -1;
break;
}
default:
DPRINTF(("%s():%d unexpected tftp reply opcode %d\n",
__func__, __LINE__, ntohs(tftp->th_opcode)));
return -1;
break;
}
/*
* Check for last packet, which does not fill the whole space
*/
if (m->m_pkthdr.len < hdrlen + SEGSIZE) {
DPRINTF(("%s():%d last chunk (%d bytes)\n",
__func__, __LINE__, m->m_pkthdr.len));
trh->trh_flags |= TRH_FINISHED;
}
if (ntohs(tftp->th_block) != trh->trh_block) {
DPRINTF(("%s():%d expected block %d, got block %d\n",
__func__, __LINE__, trh->trh_block, ntohs(tftp->th_block)));
return -1;
}
/*
* Grow the receiving buffer to accommodate new data
*/
newlen = trh->trh_len + (m->m_pkthdr.len - hdrlen);
if ((trh->trh_base = realloc(trh->trh_base,
newlen, M_TEMP, M_WAITOK)) == NULL) {
DPRINTF(("%s():%d failed to realloc %ld bytes\n",
__func__, __LINE__, (long)newlen));
return -1;
}
/*
* Copy the data
*/
m_copydata(m, hdrlen, m->m_pkthdr.len - hdrlen,
(char *)trh->trh_base + trh->trh_len);
trh->trh_len = newlen;
return 0;
}
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