dev_net.c revision 1.5
1 /* $NetBSD: dev_net.c,v 1.5 2003/03/12 17:35:57 drochner 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * This module implements a "raw device" interface suitable for 41 * use by the stand-alone I/O library NFS and TFTP code. This interface 42 * does not support any "block" access, and exists only for the 43 * purpose of initializing the network interface and getting boot 44 * parameters. 45 * 46 * At open time, this does: 47 * 48 * find interface - netif_open() 49 * BOOTP for IP address - bootp() 50 */ 51 52 #include <machine/stdarg.h> 53 #include <sys/param.h> 54 #include <sys/socket.h> 55 #include <net/if.h> 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 59 #include <lib/libkern/libkern.h> 60 61 #include <lib/libsa/stand.h> 62 #include <lib/libsa/net.h> 63 #include "pxe_netif.h" 64 #include "dev_net.h" 65 66 static int netdev_sock = -1; 67 static int netdev_opens; 68 69 static int net_getparams __P((int sock)); 70 71 /* 72 * Called by devopen after it sets f->f_dev to our devsw entry. 73 * This opens the low-level device and sets f->f_devdata. 74 * This is declared with variable arguments... 75 */ 76 int 77 net_open(struct open_file *f, ...) 78 { 79 int error = 0; 80 81 #ifdef NETIF_DEBUG 82 if (debug) 83 printf("net_open\n"); 84 #endif 85 86 /* On first open, do netif open, mount, etc. */ 87 if (netdev_opens == 0) { 88 /* Find network interface. */ 89 if (netdev_sock < 0) { 90 netdev_sock = pxe_netif_open(); 91 if (netdev_sock < 0) { 92 printf("net_open: netif_open() failed\n"); 93 return (ENXIO); 94 } 95 if (debug) 96 printf("net_open: netif_open() succeeded\n"); 97 } 98 if (rootip.s_addr == 0) { 99 /* Get root IP address, and path, etc. */ 100 error = net_getparams(netdev_sock); 101 if (error) { 102 /* getparams makes its own noise */ 103 pxe_netif_close(netdev_sock); 104 netdev_sock = -1; 105 return (error); 106 } 107 } 108 } 109 netdev_opens++; 110 f->f_devdata = &netdev_sock; 111 return (error); 112 } 113 114 int 115 net_close(f) 116 struct open_file *f; 117 { 118 119 #ifdef NETIF_DEBUG 120 if (debug) 121 printf("net_close: opens=%d\n", netdev_opens); 122 #endif 123 124 /* On last close, do netif close, etc. */ 125 f->f_devdata = NULL; 126 /* Extra close call? */ 127 if (netdev_opens <= 0) 128 return (0); 129 netdev_opens--; 130 /* Not last close? */ 131 if (netdev_opens > 0) 132 return(0); 133 rootip.s_addr = 0; 134 if (netdev_sock >= 0) { 135 if (debug) 136 printf("net_close: calling netif_close()\n"); 137 pxe_netif_close(netdev_sock); 138 pxe_netif_shutdown(); /* XXX shouldn't be done here */ 139 netdev_sock = -1; 140 } 141 return (0); 142 } 143 144 int 145 net_ioctl(f, cmd, data) 146 struct open_file *f; 147 u_long cmd; 148 void *data; 149 { 150 return EIO; 151 } 152 153 int 154 net_strategy(devdata, rw, blk, size, buf, rsize) 155 void *devdata; 156 int rw; 157 daddr_t blk; 158 size_t size; 159 void *buf; 160 size_t *rsize; 161 { 162 return EIO; 163 } 164 165 166 /* 167 * Get info for network boot: our IP address, our hostname, 168 * server IP address, and our root path on the server. 169 */ 170 #ifdef SUPPORT_BOOTP 171 int bootp __P((int sock)); 172 #endif 173 174 static int 175 net_getparams(sock) 176 int sock; 177 { 178 179 #ifdef SUPPORT_BOOTP 180 /* 181 * Try to get boot info using BOOTP. If we succeed, then 182 * the server IP address, gateway, and root path will all 183 * be initialized. If any remain uninitialized, we will 184 * use RARP and RPC/bootparam (the Sun way) to get them. 185 */ 186 bootp(sock); 187 if (myip.s_addr != 0) 188 return (0); 189 if (debug) 190 printf("net_open: BOOTP failed\n"); 191 #endif 192 193 return (EIO); 194 } 195
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