1 /* $NetBSD: dev_net.c,v 1.11 2011/07/17 20:54:42 joerg 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
58 static int netdev_sock = -1;
59 static int netdev_opens;
60
61 static 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 */
68 int
net_open(struct open_file * f,...)69 net_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
106 int
net_close(struct open_file * f)107 net_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
134 int
net_ioctl(struct open_file * f,u_long cmd,void * data)135 net_ioctl(struct open_file *f, u_long cmd, void *data)
136 {
137 return EIO;
138 }
139
140 int
net_strategy(void * devdata,int rw,daddr_t blk,size_t size,void * buf,size_t * rsize)141 net_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
152 int bootp(int sock);
153 #endif
154
155 static int
net_getparams(int sock)156 net_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