stand/netboot/dev_net.c

/* $NetBSD: dev_net.c,v 1.17 2021/04/12 03:55:40 mrg Exp $ */

/*
 * Copyright (c) 1995 Gordon W. Ross
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/*
 * This module implements a "raw device" interface suitable for
 * use by the stand-alone I/O library NFS code.  This interface
 * does not support any "block" access, and exists only for the
 * purpose of initializing the network interface, getting boot
 * parameters, and performing the NFS mount.
 *
 * At open time, this does:
 *
 * find interface      - netif_open()
 * RARP for IP address - rarp_getipaddress()
 * RPC/bootparams      - callrpc(d, RPC_BOOTPARAMS, ...)
 * RPC/mountd          - nfs_mount(sock, ip, path)
 *
 * the root file handle from mountd is saved in a global
 * for use by the NFS open code (NFS/lookup).
 */

#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>

#include <lib/libsa/stand.h>
#include <lib/libsa/net.h>
#include <lib/libsa/netif.h>
#include <lib/libsa/bootparam.h>
#include <lib/libsa/nfs.h>

#include <lib/libkern/libkern.h>

#include "dev_net.h"

#ifndef SUN_BOOTPARAMS
void bootp(int);
#endif

extern int debug;
extern int nfs_root_node[];   /* XXX - get from nfs_mount() */

/*
 * Local things...
 */
static int netdev_sock = -1;
static int netdev_opens;

int net_getparams(int);

/*
 * Called by devopen after it sets f->f_dev to our devsw entry.
 * This opens the low-level device and sets f->f_devdata.
 * This is declared with variable arguments...
 */
int
net_open(struct open_file *f, ...)
{
          va_list ap;
          char *devname;                /* Device part of file name (or NULL). */
          int error = 0;

          va_start(ap, f);
          devname = va_arg(ap, char*);
          va_end(ap);

#ifdef    NETIF_DEBUG
          if (debug)
                    printf("net_open: %s\n", devname);
#endif

          /* On first open, do netif open, mount, etc. */
          if (netdev_opens == 0) {
                    /* Find network interface. */
                    if (netdev_sock < 0) {
                              netdev_sock = netif_open(devname);
                              if (netdev_sock < 0) {
                                        printf("net_open: netif_open() failed\n");
                                        return (ENXIO);
                              }
                              if (debug)
                                        printf("net_open: netif_open() succeeded\n");
                    }
                    if (rootip.s_addr == 0) {
                              /* Get root IP address, and path, etc. */
                              error = net_getparams(netdev_sock);
                              if (error) {
                                        /* getparams makes its own noise */
                                        goto fail;
                              }
                              /* Get the NFS file handle (mountd). */
                              error = nfs_mount(netdev_sock, rootip, rootpath);
                              if (error) {
                                        error = errno;
                                        printf("net_open: NFS mount error=%d\n", error);
                                        rootip.s_addr = 0;
                              fail:
                                        netif_close(netdev_sock);
                                        netdev_sock = -1;
                                        return (error);
                              }
                              if (debug)
                                        printf("net_open: NFS mount succeeded\n");
                    }
          }
          netdev_opens++;
          f->f_devdata = nfs_root_node;
          return (error);
}

int
net_close(struct open_file *f)
{

#ifdef    NETIF_DEBUG
          if (debug)
                    printf("net_close: opens=%d\n", netdev_opens);
#endif

          /* On last close, do netif close, etc. */
          f->f_devdata = NULL;
          /* Extra close call? */
          if (netdev_opens <= 0)
                    return (0);
          netdev_opens--;
          /* Not last close? */
          if (netdev_opens > 0)
                    return(0);
          rootip.s_addr = 0;
          if (netdev_sock >= 0) {
                    if (debug)
                              printf("net_close: calling netif_close()\n");
                    netif_close(netdev_sock);
                    netdev_sock = -1;
          }
          return (0);
}

int
net_ioctl(struct open_file *f, u_long cmd, void *data)
{
          return EIO;
}

int
net_strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf, size_t *rsize)
{
          return EIO;
}

int
net_getparams(int sock)
{
          /*
           * Get info for NFS boot: our IP address, our hostname,
           * server IP address, and our root path on the server.
           * There are two ways to do this:  The old, Sun way,
           * and the more modern, BOOTP way. (RFC951, RFC1048)
           */

#ifdef    SUN_BOOTPARAMS
          /* Get our IP address.  (rarp.c) */
          if (rarp_getipaddress(sock)) {
                    printf("net_open: RARP failed\n");
                    return (EIO);
          }
#else     /* BOOTPARAMS */
          /*
           * Get boot info using BOOTP. (RFC951, RFC1048)
           * This also gets the server IP address, gateway,
           * root path, etc.
           */
          bootp(sock);
          if (myip.s_addr == 0) {
                    printf("net_open: BOOTP failed\n");
                    return (EIO);
          }
#endif    /* BOOTPARAMS */

          printf("boot: client addr: %s\n", inet_ntoa(myip));

#ifdef    SUN_BOOTPARAMS
          /* Get our hostname, server IP address, gateway. */
          if (bp_whoami(sock)) {
                    printf("net_open: bootparam/whoami RPC failed\n");
                    return (EIO);
          }
#endif    /* BOOTPARAMS */

          printf("boot: client name: %s\n", hostname);
          if (gateip.s_addr) {
                    printf("boot: subnet mask: %s\n", intoa(netmask));
                    printf("boot: net gateway: %s\n", inet_ntoa(gateip));
          }

#ifdef    SUN_BOOTPARAMS
          /* Get the root pathname. */
          if (bp_getfile(sock, "root", &rootip, rootpath)) {
                    printf("net_open: bootparam/getfile RPC failed\n");
                    return (EIO);
          }
#endif    /* BOOTPARAMS */

          printf("boot: server addr: %s\n", inet_ntoa(rootip));
          printf("boot: server path: %s\n", rootpath);

          return (0);
}