/* $NetBSD: dev_net.c,v 1.23 2008/04/28 20:24:06 martin 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. */ #include /*- * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include "dev_net.h" #include "bootstrap.h" #ifdef NETIF_DEBUG int debug = 0; #endif static char *netdev_name; static int netdev_sock = -1; static int netdev_opens; static int net_init(void); static int net_open(struct open_file *, ...); static int net_close(struct open_file *); static void net_cleanup(void); static int net_strategy(void *, int, daddr_t, size_t, char *, size_t *); static int net_print(int); static int net_getparams(int sock); struct devsw netdev = { .dv_name = "net", .dv_type = DEVT_NET, .dv_init = net_init, .dv_strategy = net_strategy, .dv_open = net_open, .dv_close = net_close, .dv_ioctl = noioctl, .dv_print = net_print, .dv_cleanup = net_cleanup, }; static struct uri_scheme { const char *scheme; int proto; } uri_schemes[] = { { "tftp:/", NET_TFTP }, { "nfs:/", NET_NFS }, }; static int net_init(void) { return (0); } /* * Called by devopen after it sets f->f_dev to our devsw entry. * This opens the low-level device and sets dev->d_opendata. * This is declared with variable arguments... */ static int net_open(struct open_file *f, ...) { struct iodesc *d; va_list args; struct devdesc *dev; const char *devname; /* Device part of file name (or NULL). */ int error = 0; va_start(args, f); dev = va_arg(args, struct devdesc *); va_end(args); devname = dev->d_dev->dv_name; /* Before opening another interface, close the previous one first. */ if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0) net_cleanup(); /* On first open, do netif open, mount, etc. */ if (netdev_opens == 0) { /* Find network interface. */ if (netdev_sock < 0) { netdev_sock = netif_open(dev); if (netdev_sock < 0) { printf("%s: netif_open() failed\n", __func__); return (ENXIO); } netdev_name = strdup(devname); #ifdef NETIF_DEBUG if (debug) printf("%s: netif_open() succeeded\n", __func__); #endif } /* * If network params were not set by netif_open(), try to get * them via bootp, rarp, etc. */ if (rootip.s_addr == 0) { /* Get root IP address, and path, etc. */ error = net_getparams(netdev_sock); if (error) { /* getparams makes its own noise */ free(netdev_name); netif_close(netdev_sock); netdev_sock = -1; return (error); } } /* * Set the variables required by the kernel's nfs_diskless * mechanism. This is the minimum set of variables required to * mount a root filesystem without needing to obtain additional * info from bootp or other sources. */ d = socktodesc(netdev_sock); setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1); setenv("boot.netif.ip", inet_ntoa(myip), 1); setenv("boot.netif.netmask", intoa(netmask), 1); setenv("boot.netif.gateway", inet_ntoa(gateip), 1); setenv("boot.netif.server", inet_ntoa(rootip), 1); if (netproto == NET_TFTP) { setenv("boot.tftproot.server", inet_ntoa(rootip), 1); setenv("boot.tftproot.path", rootpath, 1); } else if (netproto == NET_NFS) { setenv("boot.nfsroot.server", inet_ntoa(rootip), 1); setenv("boot.nfsroot.path", rootpath, 1); } if (intf_mtu != 0) { char mtu[16]; snprintf(mtu, sizeof(mtu), "%u", intf_mtu); setenv("boot.netif.mtu", mtu, 1); } } netdev_opens++; dev->d_opendata = &netdev_sock; return (error); } static int net_close(struct open_file *f) { struct devdesc *dev; #ifdef NETIF_DEBUG if (debug) printf("%s: opens=%d\n", __func__, netdev_opens); #endif dev = f->f_devdata; dev->d_opendata = NULL; return (0); } static void net_cleanup(void) { if (netdev_sock >= 0) { #ifdef NETIF_DEBUG if (debug) printf("%s: calling netif_close()\n", __func__); #endif rootip.s_addr = 0; free(netdev_name); netif_close(netdev_sock); netdev_sock = -1; } } static int net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf, size_t *rsize) { return (EIO); } #define SUPPORT_BOOTP /* * 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 initialied data, * which will override this common definition. */ #ifdef SUPPORT_BOOTP int try_bootp = 1; #endif extern n_long ip_convertaddr(char *p); static int net_getparams(int sock) { char buf[MAXHOSTNAMELEN]; n_long rootaddr, 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) goto exit; #ifdef NETIF_DEBUG if (debug) printf("%s: BOOTP failed, trying RARP/RPC...\n", __func__); #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("%s: RARP failed\n", __func__); return (EIO); } printf("%s: client addr: %s\n", __func__, inet_ntoa(myip)); /* Get our hostname, server IP address, gateway. */ if (bp_whoami(sock)) { printf("%s: bootparam/whoami RPC failed\n", __func__); return (EIO); } #ifdef NETIF_DEBUG if (debug) printf("%s: client name: %s\n", __func__, 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) == 0) { /* Got it! Parse the netmask. */ smask = ip_convertaddr(buf); } if (smask) { netmask = smask; #ifdef NETIF_DEBUG if (debug) printf("%s: subnet mask: %s\n", __func__, intoa(netmask)); #endif } #ifdef NETIF_DEBUG if (gateip.s_addr && debug) printf("%s: net gateway: %s\n", __func__, inet_ntoa(gateip)); #endif /* Get the root server and pathname. */ if (bp_getfile(sock, "root", &rootip, rootpath)) { printf("%s: bootparam/getfile RPC failed\n", __func__); return (EIO); } exit: if ((rootaddr = net_parse_rootpath()) != INADDR_NONE) rootip.s_addr = rootaddr; #ifdef NETIF_DEBUG if (debug) { printf("%s: server addr: %s\n", __func__, inet_ntoa(rootip)); printf("%s: server path: %s\n", __func__, rootpath); } #endif return (0); } static int net_print(int verbose) { struct netif_driver *drv; int i, d, cnt; int ret = 0; if (netif_drivers[0] == NULL) return (ret); printf("%s devices:", netdev.dv_name); if ((ret = pager_output("\n")) != 0) return (ret); cnt = 0; for (d = 0; netif_drivers[d]; d++) { drv = netif_drivers[d]; for (i = 0; i < drv->netif_nifs; i++) { printf("\t%s%d:", netdev.dv_name, cnt++); if (verbose) { printf(" (%s%d)", drv->netif_bname, drv->netif_ifs[i].dif_unit); } if ((ret = pager_output("\n")) != 0) return (ret); } } return (ret); } /* * Parses the rootpath if present * * The rootpath format can be in the form * ://ip/path * :/path * * For compatibility with previous behaviour it also accepts as an NFS scheme * ip:/path * /path * * If an ip is set it returns it in network byte order. * The default scheme defined in the global netproto, if not set it defaults to * NFS. * It leaves just the pathname in the global rootpath. */ uint32_t net_parse_rootpath(void) { n_long addr = htonl(INADDR_NONE); size_t i; char ip[FNAME_SIZE]; char *ptr, *val; netproto = NET_NONE; for (i = 0; i < nitems(uri_schemes); i++) { if (strncmp(rootpath, uri_schemes[i].scheme, strlen(uri_schemes[i].scheme)) != 0) continue; netproto = uri_schemes[i].proto; break; } ptr = rootpath; /* Fallback for compatibility mode */ if (netproto == NET_NONE) { netproto = NET_NFS; (void)strsep(&ptr, ":"); if (ptr != NULL) { addr = inet_addr(rootpath); bcopy(ptr, rootpath, strlen(ptr) + 1); } } else { ptr += strlen(uri_schemes[i].scheme); if (*ptr == '/') { /* we are in the form ://, we do expect an ip */ ptr++; /* * XXX when http will be there we will need to check for * a port, but right now we do not need it yet */ val = strchr(ptr, '/'); if (val != NULL) { snprintf(ip, sizeof(ip), "%.*s", (int)((uintptr_t)val - (uintptr_t)ptr), ptr); addr = inet_addr(ip); bcopy(val, rootpath, strlen(val) + 1); } } else { ptr--; bcopy(ptr, rootpath, strlen(ptr) + 1); } } return (addr); }