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 <machine/stdarg.h> 46 #include <sys/param.h> 47 #include <sys/socket.h> 48 #include <net/if.h> 49 #include <netinet/in.h> 50 #include <netinet/in_systm.h> 51 52 #include <lib/libkern/libkern.h> 53 54 #include <lib/libsa/stand.h> 55 #include <lib/libsa/net.h> 56 #include "pxe_netif.h" 57 #include "dev_net.h" 58 59 static int netdev_sock = -1; 60 static int netdev_opens; 61 62 static int net_getparams(int sock); 63 64 /* 65 * Called by devopen after it sets f->f_dev to our devsw entry. 66 * This opens the low-level device and sets f->f_devdata. 67 * This is declared with variable arguments... 68 */ 69 int 70 net_open(struct open_file *f, ...) 71 { 72 int error = 0; 73 74 #ifdef NETIF_DEBUG 75 if (debug) 76 printf("net_open\n"); 77 #endif 78 79 /* On first open, do netif open, mount, etc. */ 80 if (netdev_opens == 0) { 81 /* Find network interface. */ 82 if (netdev_sock < 0) { 83 netdev_sock = pxe_netif_open(); 84 if (netdev_sock < 0) { 85 printf("net_open: netif_open() failed\n"); 86 return (ENXIO); 87 } 88 if (debug) 89 printf("net_open: netif_open() succeeded\n"); 90 } 91 if (rootip.s_addr == 0) { 92 /* Get root IP address, and path, etc. */ 93 error = net_getparams(netdev_sock); 94 if (error) { 95 /* getparams makes its own noise */ 96 pxe_netif_close(netdev_sock); 97 netdev_sock = -1; 98 return (error); 99 } 100 } 101 } 102 netdev_opens++; 103 f->f_devdata = &netdev_sock; 104 return (error); 105 } 106 107 int 108 net_close(struct open_file *f) 109 { 110 111 #ifdef NETIF_DEBUG 112 if (debug) 113 printf("net_close: opens=%d\n", netdev_opens); 114 #endif 115 116 /* On last close, do netif close, etc. */ 117 f->f_devdata = NULL; 118 /* Extra close call? */ 119 if (netdev_opens <= 0) 120 return (0); 121 netdev_opens--; 122 /* Not last close? */ 123 if (netdev_opens > 0) 124 return(0); 125 rootip.s_addr = 0; 126 if (netdev_sock >= 0) { 127 if (debug) 128 printf("net_close: calling netif_close()\n"); 129 pxe_netif_close(netdev_sock); 130 netdev_sock = -1; 131 } 132 return (0); 133 } 134 135 int 136 net_ioctl(struct open_file *f, u_long cmd, void *data) 137 { 138 return EIO; 139 } 140 141 int 142 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf, size_t *rsize) 143 { 144 return EIO; 145 } 146 147 148 /* 149 * Get info for network boot: our IP address, our hostname, 150 * server IP address, and our root path on the server. 151 */ 152 #ifdef SUPPORT_BOOTP 153 int bootp(int sock); 154 #endif 155 156 static int 157 net_getparams(int sock) 158 { 159 160 #ifdef SUPPORT_BOOTP 161 /* 162 * Try to get boot info using BOOTP. If we succeed, then 163 * the server IP address, gateway, and root path will all 164 * be initialized. If any remain uninitialized, we will 165 * use RARP and RPC/bootparam (the Sun way) to get them. 166 */ 167 bootp(sock); 168 if (myip.s_addr != 0) 169 return (0); 170 if (debug) 171 printf("net_open: BOOTP failed\n"); 172 #endif 173 174 return (EIO); 175 } 176