/* $OpenBSD: dev_net.c,v 1.6 2023/01/10 17:10:57 miod Exp $ */ /* $NetBSD: dev_net.c,v 1.26 2011/07/17 20:54:52 joerg 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 code. This interface * does not support any "block" access, and exists only for the * purpose of initializing the network interface, getting boot * parameters, and performing the NFS mount. * * At open time, this does: * * find interface - netif_open() * RARP for IP address - rarp_getipaddress() * RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...) * RPC/mountd - nfs_mount(sock, ip, path) * * the root file handle from mountd is saved in a global * for use by the NFS open code (NFS/lookup). */ #include <sys/param.h> #include <sys/socket.h> #include <netinet/in.h> #include <lib/libkern/libkern.h> #include <lib/libsa/stand.h> #include <lib/libsa/net.h> #include <lib/libsa/netif.h> #include <lib/libsa/nfs.h> #include <lib/libsa/bootparam.h> #include "dev_net.h" #ifdef SUPPORT_BOOTP #include <lib/libsa/bootp.h> #endif extern int nfs_root_node[]; /* XXX - get from nfs_mount() */ static int netdev_sock = -1; static int netdev_opens; static int net_getparams(int); #ifdef DEBUG extern int debug; #endif /* * 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, ...) { va_list ap; char *devname; /* Device part of file name (or NULL). */ int error = 0; va_start(ap, f); devname = va_arg(ap, char *); va_end(ap); #ifdef NETIF_DEBUG if (debug) printf("%s\n", devname); #endif /* On first open, do netif open, mount, etc. */ if (netdev_opens == 0) { /* Find network interface. */ if (netdev_sock < 0) { netdev_sock = netif_open(devname); if (netdev_sock < 0) { printf("netif_open() failed\n"); return ENXIO; } #ifdef NETIF_DEBUG if (debug) printf("netif_open() succeeded\n"); #endif } if (rootip.s_addr == 0) { /* Get root IP address, and path, etc. */ error = net_getparams(netdev_sock); if (error) { /* getparams makes its own noise */ goto fail; } /* Get the NFS file handle (mountd). */ error = nfs_mount(netdev_sock, rootip, rootpath); if (error) { printf("NFS mount error=%d\n", errno); rootip.s_addr = 0; fail: netif_close(netdev_sock); netdev_sock = -1; return error; } #ifdef NETIF_DEBUG if (debug) printf("NFS mount succeeded\n"); #endif } } netdev_opens++; f->f_devdata = nfs_root_node; 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 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 NFS boot: our IP address, our hostname, * server IP address, and our root path on the server. * There are two ways to do this: The old, Sun way, * and the more modern, BOOTP way. (RFC951, RFC1048) * * The default is to use the Sun bootparams RPC * (because that is what the kernel will do). * MD code can make try_bootp initialized data, * which will override this common definition. */ #ifdef SUPPORT_BOOTP int try_bootp; #endif static int net_getparams(int sock) { char buf[MAXHOSTNAMELEN]; u_int32_t smask; #ifdef SUPPORT_BOOTP /* * 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. */ if (try_bootp) bootp(sock); if (myip.s_addr != 0) return 0; #ifdef NETIF_DEBUG if (debug) printf("BOOTP failed, trying RARP/RPC...\n"); #endif #endif /* * Use RARP to get our IP address. This also sets our * netmask to the "natural" default for our address. */ if (rarp_getipaddress(sock)) { printf("RARP failed\n"); return EIO; } #ifdef NETIF_DEBUG if (debug) printf("client addr: %s\n", inet_ntoa(myip)); #endif /* Get our hostname, server IP address, gateway. */ if (bp_whoami(sock)) { printf("bootparam/whoami RPC failed\n"); return EIO; } #ifdef NETIF_DEBUG if (debug) printf("client name: %s\n", hostname); #endif /* * Ignore the gateway from whoami (unreliable). * Use the "gateway" parameter instead. */ smask = 0; gateip.s_addr = 0; if (bp_getfile(sock, "gateway", &gateip, buf)) { printf("nfs_open: gateway bootparam missing\n"); } else { /* Got it! Parse the netmask. */ smask = inet_addr(buf); } if (smask) { netmask = smask; #ifdef NETIF_DEBUG if (debug) printf("subnet mask: %s\n", intoa(netmask)); #endif } #ifdef NETIF_DEBUG if (debug) if (gateip.s_addr) printf("net gateway: %s\n", inet_ntoa(gateip)); #endif /* Get the root server and pathname. */ if (bp_getfile(sock, "root", &rootip, rootpath)) { printf("bootparam/getfile RPC failed\n"); return EIO; } #ifdef NETIF_DEBUG if (debug) { printf("server addr: %s\n", inet_ntoa(rootip)); printf("server path: %s\n", rootpath); } #endif return 0; }
