1 /* $OpenBSD: pxe_net.c,v 1.7 2020/12/09 18:10:18 krw Exp $ */
2 /* $NetBSD: dev_net.c,v 1.4 2003/03/12 13:15:08 drochner Exp $ */
3
4 /*-
5 * Copyright (c) 1997 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Gordon W. Ross.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * This module implements a "raw device" interface suitable for
35 * use by the stand-alone I/O library NFS and TFTP code. This interface
36 * does not support any "block" access, and exists only for the
37 * purpose of initializing the network interface and getting boot
38 * parameters.
39 *
40 * At open time, this does:
41 *
42 * find interface - netif_open()
43 * BOOTP for IP address - bootp()
44 */
45
46 #include <sys/param.h>
47 #include <sys/socket.h>
48 #include <net/if.h>
49 #include <netinet/in.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 "pxe_net.h"
57
58 static int netdev_sock = -1;
59 static int netdev_opens;
60
61 int net_getparams(int);
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 #ifdef NETIF_DEBUG
88 if (debug)
89 printf("net_open: netif_open() succeeded\n");
90 #endif
91 }
92 #ifdef notyet
93 if (rootip.s_addr == 0) {
94 /* Get root IP address, and path, etc. */
95 error = net_getparams(netdev_sock);
96 if (error) {
97 /* getparams makes its own noise */
98 pxe_netif_close(netdev_sock);
99 netdev_sock = -1;
100 return error;
101 }
102 }
103 #endif
104 }
105 netdev_opens++;
106 f->f_devdata = &netdev_sock;
107 return error;
108 }
109
110 int
net_close(struct open_file * f)111 net_close(struct open_file *f)
112 {
113 #ifdef NETIF_DEBUG
114 if (debug)
115 printf("net_close: opens=%d\n", netdev_opens);
116 #endif
117
118 /* On last close, do netif close, etc. */
119 f->f_devdata = NULL;
120 /* Extra close call? */
121 if (netdev_opens <= 0)
122 return 0;
123 netdev_opens--;
124 /* Not last close? */
125 if (netdev_opens > 0)
126 return 0;
127 rootip.s_addr = 0;
128 if (netdev_sock >= 0) {
129 #ifdef NETIF_DEBUG
130 if (debug)
131 printf("net_close: calling netif_close()\n");
132 #endif
133 pxe_netif_close(netdev_sock);
134 netdev_sock = -1;
135 }
136 return 0;
137 }
138
139 int
net_ioctl(struct open_file * f,u_long cmd,void * data)140 net_ioctl(struct open_file *f, u_long cmd, void *data)
141 {
142 return EIO;
143 }
144
145 int
net_strategy(void * devdata,int rw,daddr_t blk,size_t size,void * buf,size_t * rsize)146 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf,
147 size_t *rsize)
148 {
149 return EIO;
150 }
151
152
153 /*
154 * Get info for network boot: our IP address, our hostname,
155 * server IP address, and our root path on the server.
156 */
157 extern int bootp(int);
158
159 int
net_getparams(int sock)160 net_getparams(int sock)
161 {
162 /*
163 * Try to get boot info using BOOTP. If we succeed, then
164 * the server IP address, gateway, and root path will all
165 * be initialized. If any remain uninitialized, we will
166 * use RARP and RPC/bootparam (the Sun way) to get them.
167 */
168 bootp(sock);
169 if (myip.s_addr != 0)
170 return 0;
171 #ifdef NETIF_DEBUG
172 if (debug)
173 printf("net_getparams: BOOTP failed\n");
174 #endif
175
176 return EIO;
177 }
178