1/*	$NetBSD: dev_net.c,v 1.10 2009/12/13 23:01:42 jakllsch Exp $	*/
2
3/*-
4 * Copyright (c) 1997 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Gordon W. Ross.
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/*
33 * This module implements a "raw device" interface suitable for
34 * use by the stand-alone I/O library NFS and TFTP code.  This interface
35 * does not support any "block" access, and exists only for the
36 * purpose of initializing the network interface and getting boot
37 * parameters.
38 *
39 * At open time, this does:
40 *
41 * find interface       - netif_open()
42 * BOOTP for IP address - bootp()
43 */
44
45#include <sys/param.h>
46#include <sys/socket.h>
47#include <net/if.h>
48#include <netinet/in.h>
49#include <netinet/in_systm.h>
50
51#include <lib/libkern/libkern.h>
52
53#include <lib/libsa/stand.h>
54#include <lib/libsa/net.h>
55#include "pxe_netif.h"
56#include "dev_net.h"
57
58static int netdev_sock = -1;
59static int netdev_opens;
60
61static int net_getparams(int sock);
62
63/*
64 * Called by devopen after it sets f->f_dev to our devsw entry.
65 * This opens the low-level device and sets f->f_devdata.
66 * This is declared with variable arguments...
67 */
68int
69net_open(struct open_file *f, ...)
70{
71	int error = 0;
72
73#ifdef	NETIF_DEBUG
74	if (debug)
75		printf("net_open\n");
76#endif
77
78	/* On first open, do netif open, mount, etc. */
79	if (netdev_opens == 0) {
80		/* Find network interface. */
81		if (netdev_sock < 0) {
82			netdev_sock = pxe_netif_open();
83			if (netdev_sock < 0) {
84				printf("net_open: netif_open() failed\n");
85				return (ENXIO);
86			}
87			if (debug)
88				printf("net_open: netif_open() succeeded\n");
89		}
90		if (rootip.s_addr == 0) {
91			/* Get root IP address, and path, etc. */
92			error = net_getparams(netdev_sock);
93			if (error) {
94				/* getparams makes its own noise */
95				pxe_netif_close(netdev_sock);
96				netdev_sock = -1;
97				return (error);
98			}
99		}
100	}
101	netdev_opens++;
102	f->f_devdata = &netdev_sock;
103	return (error);
104}
105
106int
107net_close(struct open_file *f)
108{
109
110#ifdef	NETIF_DEBUG
111	if (debug)
112		printf("net_close: opens=%d\n", netdev_opens);
113#endif
114
115	/* On last close, do netif close, etc. */
116	f->f_devdata = NULL;
117	/* Extra close call? */
118	if (netdev_opens <= 0)
119		return (0);
120	netdev_opens--;
121	/* Not last close? */
122	if (netdev_opens > 0)
123		return(0);
124	rootip.s_addr = 0;
125	if (netdev_sock >= 0) {
126		if (debug)
127			printf("net_close: calling netif_close()\n");
128		pxe_netif_close(netdev_sock);
129		netdev_sock = -1;
130	}
131	return (0);
132}
133
134int
135net_ioctl(struct open_file *f, u_long cmd, void *data)
136{
137	return EIO;
138}
139
140int
141net_strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf, size_t *rsize)
142{
143	return EIO;
144}
145
146
147/*
148 * Get info for network boot: our IP address, our hostname,
149 * server IP address, and our root path on the server.
150 */
151#ifdef	SUPPORT_BOOTP
152int bootp(int sock);
153#endif
154
155static int
156net_getparams(int sock)
157{
158
159#ifdef	SUPPORT_BOOTP
160	/*
161	 * Try to get boot info using BOOTP.  If we succeed, then
162	 * the server IP address, gateway, and root path will all
163	 * be initialized.  If any remain uninitialized, we will
164	 * use RARP and RPC/bootparam (the Sun way) to get them.
165	 */
166	bootp(sock);
167	if (myip.s_addr != 0)
168		return (0);
169	if (debug)
170		printf("net_open: BOOTP failed\n");
171#endif
172
173	return (EIO);
174}
175