/* $OpenBSD: pxe_net.c,v 1.7 2020/12/09 18:10:18 krw Exp $ */ /* $NetBSD: dev_net.c,v 1.4 2003/03/12 13:15:08 drochner Exp $ */ /*- * Copyright (c) 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Gordon W. Ross. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * This module implements a "raw device" interface suitable for * use by the stand-alone I/O library NFS and TFTP code. This interface * does not support any "block" access, and exists only for the * purpose of initializing the network interface and getting boot * parameters. * * At open time, this does: * * find interface - netif_open() * BOOTP for IP address - bootp() */ #include #include #include #include #include #include #include #include "pxe_netif.h" #include "pxe_net.h" static int netdev_sock = -1; static int netdev_opens; int net_getparams(int); /* * Called by devopen after it sets f->f_dev to our devsw entry. * This opens the low-level device and sets f->f_devdata. * This is declared with variable arguments... */ int net_open(struct open_file *f, ...) { int error = 0; #ifdef NETIF_DEBUG if (debug) printf("net_open()\n"); #endif /* On first open, do netif open, mount, etc. */ if (netdev_opens == 0) { /* Find network interface. */ if (netdev_sock < 0) { netdev_sock = pxe_netif_open(); if (netdev_sock < 0) { printf("net_open: netif_open() failed\n"); return ENXIO; } #ifdef NETIF_DEBUG if (debug) printf("net_open: netif_open() succeeded\n"); #endif } #ifdef notyet if (rootip.s_addr == 0) { /* Get root IP address, and path, etc. */ error = net_getparams(netdev_sock); if (error) { /* getparams makes its own noise */ pxe_netif_close(netdev_sock); netdev_sock = -1; return error; } } #endif } netdev_opens++; f->f_devdata = &netdev_sock; return error; } int net_close(struct open_file *f) { #ifdef NETIF_DEBUG if (debug) printf("net_close: opens=%d\n", netdev_opens); #endif /* On last close, do netif close, etc. */ f->f_devdata = NULL; /* Extra close call? */ if (netdev_opens <= 0) return 0; netdev_opens--; /* Not last close? */ if (netdev_opens > 0) return 0; rootip.s_addr = 0; if (netdev_sock >= 0) { #ifdef NETIF_DEBUG if (debug) printf("net_close: calling netif_close()\n"); #endif pxe_netif_close(netdev_sock); netdev_sock = -1; } return 0; } int net_ioctl(struct open_file *f, u_long cmd, void *data) { return EIO; } int net_strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf, size_t *rsize) { return EIO; } /* * Get info for network boot: our IP address, our hostname, * server IP address, and our root path on the server. */ extern int bootp(int); int net_getparams(int sock) { /* * Try to get boot info using BOOTP. If we succeed, then * the server IP address, gateway, and root path will all * be initialized. If any remain uninitialized, we will * use RARP and RPC/bootparam (the Sun way) to get them. */ bootp(sock); if (myip.s_addr != 0) return 0; #ifdef NETIF_DEBUG if (debug) printf("net_getparams: BOOTP failed\n"); #endif return EIO; }