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