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      1 /* $NetBSD: dev_net.c,v 1.3 2014/08/05 17:55:20 joerg Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tohru Nishimura.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/param.h>
     33 
     34 #include <netinet/in.h>
     35 #include <netinet/in_systm.h>
     36 
     37 #include <lib/libsa/stand.h>
     38 #include <lib/libsa/net.h>
     39 #include <lib/libsa/bootp.h>
     40 #include <lib/libsa/nfs.h>
     41 #include <lib/libkern/libkern.h>
     42 
     43 #include <machine/bootinfo.h>
     44 
     45 #include "globals.h"
     46 
     47 static int netdev_sock = -1;
     48 static int netdev_opens;
     49 
     50 int
     51 net_open(struct open_file *f, ...)
     52 
     53 {
     54 	va_list ap;
     55 	char *file, *proto;
     56 	int error;
     57 	extern struct btinfo_bootpath bi_path;
     58 
     59 	va_start(ap, f);
     60 	file = va_arg(ap, char *);
     61 	proto = va_arg(ap, char *);
     62 	va_end(ap);
     63 
     64 	if (netdev_opens > 0)
     65 		return 0;
     66 
     67 	if ((netdev_sock = netif_open(NULL)) < 0)
     68 		return ENXIO;	/* never fails indeed */
     69 
     70 	error = 0;
     71 	bootp(netdev_sock);	/* send DHCP request */
     72 	if (myip.s_addr == 0) {
     73 		error = ENOENT;	/* IP address was not found */
     74 		goto bad;
     75 	}
     76 
     77 	if (file[0] != '\0')
     78 		snprintf(bootfile, sizeof(bootfile), "%s", file);
     79 	else if (bootfile[0] == '\0')
     80 		snprintf(bootfile, sizeof(bootfile), "netbsd");
     81 
     82 	if (strcmp(proto, "nfs") == 0
     83 	    && (error = nfs_mount(netdev_sock, rootip, rootpath)) != 0)
     84 		goto bad;
     85 
     86 	snprintf(bi_path.bootpath, sizeof(bi_path.bootpath), "%s", bootfile);
     87 	f->f_devdata = &netdev_sock;
     88 	netdev_opens++;
     89 	return 0;
     90  bad:
     91 	netif_close(netdev_sock);
     92 	netdev_sock = -1;
     93 	return error;
     94 }
     95 
     96 int
     97 net_close(struct open_file *f)
     98 
     99 {
    100 	f->f_devdata = NULL;
    101 	if (--netdev_opens > 0)
    102 		return 0;
    103 	netif_close(netdev_sock);
    104 	netdev_sock = -1;
    105 	return 0;
    106 }
    107 
    108 int
    109 net_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
    110 	void *p, size_t *rsize)
    111 {
    112 
    113 	return EIO;
    114 }
    115