| /* |
| * $Id: nfsroot.c,v 1.45 1998/03/07 10:44:46 mj Exp $ |
| * |
| * Copyright (C) 1995, 1996 Gero Kuhlmann <gero@gkminix.han.de> |
| * |
| * Allow an NFS filesystem to be mounted as root. The way this works is: |
| * (1) Use the IP autoconfig mechanism to set local IP addresses and routes. |
| * (2) Handle RPC negotiation with the system which replied to RARP or |
| * was reported as a boot server by BOOTP or manually. |
| * (3) The actual mounting is done later, when init() is running. |
| * |
| * |
| * Changes: |
| * |
| * Alan Cox : Removed get_address name clash with FPU. |
| * Alan Cox : Reformatted a bit. |
| * Gero Kuhlmann : Code cleanup |
| * Michael Rausch : Fixed recognition of an incoming RARP answer. |
| * Martin Mares : (2.0) Auto-configuration via BOOTP supported. |
| * Martin Mares : Manual selection of interface & BOOTP/RARP. |
| * Martin Mares : Using network routes instead of host routes, |
| * allowing the default configuration to be used |
| * for normal operation of the host. |
| * Martin Mares : Randomized timer with exponential backoff |
| * installed to minimize network congestion. |
| * Martin Mares : Code cleanup. |
| * Martin Mares : (2.1) BOOTP and RARP made configuration options. |
| * Martin Mares : Server hostname generation fixed. |
| * Gerd Knorr : Fixed wired inode handling |
| * Martin Mares : (2.2) "0.0.0.0" addresses from command line ignored. |
| * Martin Mares : RARP replies not tested for server address. |
| * Gero Kuhlmann : (2.3) Some bug fixes and code cleanup again (please |
| * send me your new patches _before_ bothering |
| * Linus so that I don' always have to cleanup |
| * _afterwards_ - thanks) |
| * Gero Kuhlmann : Last changes of Martin Mares undone. |
| * Gero Kuhlmann : RARP replies are tested for specified server |
| * again. However, it's now possible to have |
| * different RARP and NFS servers. |
| * Gero Kuhlmann : "0.0.0.0" addresses from command line are |
| * now mapped to INADDR_NONE. |
| * Gero Kuhlmann : Fixed a bug which prevented BOOTP path name |
| * from being used (thanks to Leo Spiekman) |
| * Andy Walker : Allow to specify the NFS server in nfs_root |
| * without giving a path name |
| * Swen Thümmler : Allow to specify the NFS options in nfs_root |
| * without giving a path name. Fix BOOTP request |
| * for domainname (domainname is NIS domain, not |
| * DNS domain!). Skip dummy devices for BOOTP. |
| * Jacek Zapala : Fixed a bug which prevented server-ip address |
| * from nfsroot parameter from being used. |
| * Olaf Kirch : Adapted to new NFS code. |
| * Jakub Jelinek : Free used code segment. |
| * Marko Kohtala : Fixed some bugs. |
| * Martin Mares : Debug message cleanup |
| * Martin Mares : Changed to use the new generic IP layer autoconfig |
| * code. BOOTP and RARP moved there. |
| * Martin Mares : Default path now contains host name instead of |
| * host IP address (but host name defaults to IP |
| * address anyway). |
| * Martin Mares : Use root_server_addr appropriately during setup. |
| * Martin Mares : Rewrote parameter parsing, now hopefully giving |
| * correct overriding. |
| * Trond Myklebust : Add in preliminary support for NFSv3 and TCP. |
| * Fix bug in root_nfs_addr(). nfs_data.namlen |
| * is NOT for the length of the hostname. |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/fs.h> |
| #include <linux/init.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/nfs.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/nfs_mount.h> |
| #include <linux/in.h> |
| #include <linux/inet.h> |
| #include <linux/major.h> |
| #include <linux/utsname.h> |
| #include <net/ipconfig.h> |
| |
| /* Define this to allow debugging output */ |
| #undef NFSROOT_DEBUG |
| #define NFSDBG_FACILITY NFSDBG_ROOT |
| |
| /* Default path we try to mount. "%s" gets replaced by our IP address */ |
| #define NFS_ROOT "/tftpboot/%s" |
| |
| /* Parameters passed from the kernel command line */ |
| static char nfs_root_name[256] __initdata = ""; |
| |
| /* Address of NFS server */ |
| static __u32 servaddr __initdata = 0; |
| |
| /* Name of directory to mount */ |
| static char nfs_path[NFS_MAXPATHLEN] __initdata = { 0, }; |
| |
| /* NFS-related data */ |
| static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */ |
| static int nfs_port __initdata = 0; /* Port to connect to for NFS */ |
| static int mount_port __initdata = 0; /* Mount daemon port number */ |
| |
| |
| /*************************************************************************** |
| |
| Parsing of options |
| |
| ***************************************************************************/ |
| |
| /* |
| * The following integer options are recognized |
| */ |
| static struct nfs_int_opts { |
| char *name; |
| int *val; |
| } root_int_opts[] __initdata = { |
| { "port", &nfs_port }, |
| { "rsize", &nfs_data.rsize }, |
| { "wsize", &nfs_data.wsize }, |
| { "timeo", &nfs_data.timeo }, |
| { "retrans", &nfs_data.retrans }, |
| { "acregmin", &nfs_data.acregmin }, |
| { "acregmax", &nfs_data.acregmax }, |
| { "acdirmin", &nfs_data.acdirmin }, |
| { "acdirmax", &nfs_data.acdirmax }, |
| { NULL, NULL } |
| }; |
| |
| |
| /* |
| * And now the flag options |
| */ |
| static struct nfs_bool_opts { |
| char *name; |
| int and_mask; |
| int or_mask; |
| } root_bool_opts[] __initdata = { |
| { "soft", ~NFS_MOUNT_SOFT, NFS_MOUNT_SOFT }, |
| { "hard", ~NFS_MOUNT_SOFT, 0 }, |
| { "intr", ~NFS_MOUNT_INTR, NFS_MOUNT_INTR }, |
| { "nointr", ~NFS_MOUNT_INTR, 0 }, |
| { "posix", ~NFS_MOUNT_POSIX, NFS_MOUNT_POSIX }, |
| { "noposix", ~NFS_MOUNT_POSIX, 0 }, |
| { "cto", ~NFS_MOUNT_NOCTO, 0 }, |
| { "nocto", ~NFS_MOUNT_NOCTO, NFS_MOUNT_NOCTO }, |
| { "ac", ~NFS_MOUNT_NOAC, 0 }, |
| { "noac", ~NFS_MOUNT_NOAC, NFS_MOUNT_NOAC }, |
| { "lock", ~NFS_MOUNT_NONLM, 0 }, |
| { "nolock", ~NFS_MOUNT_NONLM, NFS_MOUNT_NONLM }, |
| #ifdef CONFIG_NFS_V3 |
| { "v2", ~NFS_MOUNT_VER3, 0 }, |
| { "v3", ~NFS_MOUNT_VER3, NFS_MOUNT_VER3 }, |
| #endif |
| { "udp", ~NFS_MOUNT_TCP, 0 }, |
| { "tcp", ~NFS_MOUNT_TCP, NFS_MOUNT_TCP }, |
| { "broken_suid",~NFS_MOUNT_BROKEN_SUID, NFS_MOUNT_BROKEN_SUID }, |
| { NULL, 0, 0 } |
| }; |
| |
| |
| /* |
| * Extract IP address from the parameter string if needed. Note that we |
| * need to have root_server_addr set _before_ IPConfig gets called as it |
| * can override it. |
| */ |
| static void __init root_nfs_parse_addr(char *name) |
| { |
| int octets = 0; |
| char *cp, *cq; |
| |
| cp = cq = name; |
| while (octets < 4) { |
| while (*cp >= '0' && *cp <= '9') |
| cp++; |
| if (cp == cq || cp - cq > 3) |
| break; |
| if (*cp == '.' || octets == 3) |
| octets++; |
| if (octets < 4) |
| cp++; |
| cq = cp; |
| } |
| if (octets == 4 && (*cp == ':' || *cp == '\0')) { |
| if (*cp == ':') |
| *cp++ = '\0'; |
| root_server_addr = in_aton(name); |
| strcpy(name, cp); |
| } |
| } |
| |
| |
| /* |
| * Parse option string. |
| */ |
| static void __init root_nfs_parse(char *name, char *buf) |
| { |
| char *options, *val, *cp; |
| |
| if ((options = strchr(name, ','))) { |
| *options++ = 0; |
| cp = strtok(options, ","); |
| while (cp) { |
| if ((val = strchr(cp, '='))) { |
| struct nfs_int_opts *opts = root_int_opts; |
| *val++ = '\0'; |
| while (opts->name && strcmp(opts->name, cp)) |
| opts++; |
| if (opts->name) |
| *(opts->val) = (int) simple_strtoul(val, NULL, 10); |
| } else { |
| struct nfs_bool_opts *opts = root_bool_opts; |
| while (opts->name && strcmp(opts->name, cp)) |
| opts++; |
| if (opts->name) { |
| nfs_data.flags &= opts->and_mask; |
| nfs_data.flags |= opts->or_mask; |
| } |
| } |
| cp = strtok(NULL, ","); |
| } |
| } |
| if (name[0] && strcmp(name, "default")) { |
| strncpy(buf, name, NFS_MAXPATHLEN-1); |
| buf[NFS_MAXPATHLEN-1] = 0; |
| } |
| } |
| |
| |
| /* |
| * Prepare the NFS data structure and parse all options. |
| */ |
| static int __init root_nfs_name(char *name) |
| { |
| char buf[NFS_MAXPATHLEN]; |
| char *cp; |
| |
| /* Set some default values */ |
| memset(&nfs_data, 0, sizeof(nfs_data)); |
| nfs_port = -1; |
| nfs_data.version = NFS_MOUNT_VERSION; |
| nfs_data.flags = NFS_MOUNT_NONLM; /* No lockd in nfs root yet */ |
| nfs_data.rsize = NFS_DEF_FILE_IO_BUFFER_SIZE; |
| nfs_data.wsize = NFS_DEF_FILE_IO_BUFFER_SIZE; |
| nfs_data.bsize = 0; |
| nfs_data.timeo = 7; |
| nfs_data.retrans = 3; |
| nfs_data.acregmin = 3; |
| nfs_data.acregmax = 60; |
| nfs_data.acdirmin = 30; |
| nfs_data.acdirmax = 60; |
| strcpy(buf, NFS_ROOT); |
| |
| /* Process options received from the remote server */ |
| root_nfs_parse(root_server_path, buf); |
| |
| /* Override them by options set on kernel command-line */ |
| root_nfs_parse(name, buf); |
| |
| cp = system_utsname.nodename; |
| if (strlen(buf) + strlen(cp) > NFS_MAXPATHLEN) { |
| printk(KERN_ERR "Root-NFS: Pathname for remote directory too long.\n"); |
| return -1; |
| } |
| sprintf(nfs_path, buf, cp); |
| |
| return 1; |
| } |
| |
| |
| /* |
| * Get NFS server address. |
| */ |
| static int __init root_nfs_addr(void) |
| { |
| if ((servaddr = root_server_addr) == INADDR_NONE) { |
| printk(KERN_ERR "Root-NFS: No NFS server available, giving up.\n"); |
| return -1; |
| } |
| |
| strncpy(nfs_data.hostname, in_ntoa(servaddr), sizeof(nfs_data.hostname)-1); |
| return 0; |
| } |
| |
| /* |
| * Tell the user what's going on. |
| */ |
| #ifdef NFSROOT_DEBUG |
| static void __init root_nfs_print(void) |
| { |
| printk(KERN_NOTICE "Root-NFS: Mounting %s on server %s as root\n", |
| nfs_path, nfs_data.hostname); |
| printk(KERN_NOTICE "Root-NFS: rsize = %d, wsize = %d, timeo = %d, retrans = %d\n", |
| nfs_data.rsize, nfs_data.wsize, nfs_data.timeo, nfs_data.retrans); |
| printk(KERN_NOTICE "Root-NFS: acreg (min,max) = (%d,%d), acdir (min,max) = (%d,%d)\n", |
| nfs_data.acregmin, nfs_data.acregmax, |
| nfs_data.acdirmin, nfs_data.acdirmax); |
| printk(KERN_NOTICE "Root-NFS: nfsd port = %d, mountd port = %d, flags = %08x\n", |
| nfs_port, mount_port, nfs_data.flags); |
| } |
| #endif |
| |
| |
| int __init root_nfs_init(void) |
| { |
| #ifdef NFSROOT_DEBUG |
| nfs_debug |= NFSDBG_ROOT; |
| #endif |
| |
| /* |
| * Decode the root directory path name and NFS options from |
| * the kernel command line. This has to go here in order to |
| * be able to use the client IP address for the remote root |
| * directory (necessary for pure RARP booting). |
| */ |
| if (root_nfs_name(nfs_root_name) < 0 || |
| root_nfs_addr() < 0) |
| return -1; |
| |
| #ifdef NFSROOT_DEBUG |
| root_nfs_print(); |
| #endif |
| |
| return 0; |
| } |
| |
| |
| /* |
| * Parse NFS server and directory information passed on the kernel |
| * command line. |
| */ |
| int __init nfs_root_setup(char *line) |
| { |
| ROOT_DEV = mk_kdev(UNNAMED_MAJOR, 255); |
| if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) { |
| strncpy(nfs_root_name, line, sizeof(nfs_root_name)); |
| nfs_root_name[sizeof(nfs_root_name)-1] = '\0'; |
| } else { |
| int n = strlen(line) + strlen(NFS_ROOT); |
| if (n >= sizeof(nfs_root_name)) |
| line[sizeof(nfs_root_name) - strlen(NFS_ROOT) - 1] = '\0'; |
| sprintf(nfs_root_name, NFS_ROOT, line); |
| } |
| root_nfs_parse_addr(nfs_root_name); |
| return 1; |
| } |
| |
| __setup("nfsroot=", nfs_root_setup); |
| |
| /*************************************************************************** |
| |
| Routines to actually mount the root directory |
| |
| ***************************************************************************/ |
| |
| /* |
| * Construct sockaddr_in from address and port number. |
| */ |
| static inline void |
| set_sockaddr(struct sockaddr_in *sin, __u32 addr, __u16 port) |
| { |
| sin->sin_family = AF_INET; |
| sin->sin_addr.s_addr = addr; |
| sin->sin_port = port; |
| } |
| |
| /* |
| * Query server portmapper for the port of a daemon program. |
| */ |
| static int __init root_nfs_getport(int program, int version, int proto) |
| { |
| struct sockaddr_in sin; |
| |
| printk(KERN_NOTICE "Looking up port of RPC %d/%d on %s\n", |
| program, version, in_ntoa(servaddr)); |
| set_sockaddr(&sin, servaddr, 0); |
| return rpc_getport_external(&sin, program, version, proto); |
| } |
| |
| |
| /* |
| * Use portmapper to find mountd and nfsd port numbers if not overriden |
| * by the user. Use defaults if portmapper is not available. |
| * XXX: Is there any nfs server with no portmapper? |
| */ |
| static int __init root_nfs_ports(void) |
| { |
| int port; |
| int nfsd_ver, mountd_ver; |
| int nfsd_port, mountd_port; |
| int proto; |
| |
| if (nfs_data.flags & NFS_MOUNT_VER3) { |
| nfsd_ver = NFS3_VERSION; |
| mountd_ver = NFS_MNT3_VERSION; |
| nfsd_port = NFS_PORT; |
| mountd_port = NFS_MNT_PORT; |
| } else { |
| nfsd_ver = NFS2_VERSION; |
| mountd_ver = NFS_MNT_VERSION; |
| nfsd_port = NFS_PORT; |
| mountd_port = NFS_MNT_PORT; |
| } |
| |
| proto = (nfs_data.flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; |
| |
| if (nfs_port < 0) { |
| if ((port = root_nfs_getport(NFS_PROGRAM, nfsd_ver, proto)) < 0) { |
| printk(KERN_ERR "Root-NFS: Unable to get nfsd port " |
| "number from server, using default\n"); |
| port = nfsd_port; |
| } |
| nfs_port = htons(port); |
| dprintk("Root-NFS: Portmapper on server returned %d " |
| "as nfsd port\n", port); |
| } |
| |
| if ((port = root_nfs_getport(NFS_MNT_PROGRAM, mountd_ver, proto)) < 0) { |
| printk(KERN_ERR "Root-NFS: Unable to get mountd port " |
| "number from server, using default\n"); |
| port = mountd_port; |
| } |
| mount_port = htons(port); |
| dprintk("Root-NFS: mountd port is %d\n", port); |
| |
| return 0; |
| } |
| |
| |
| /* |
| * Get a file handle from the server for the directory which is to be |
| * mounted. |
| */ |
| static int __init root_nfs_get_handle(void) |
| { |
| struct sockaddr_in sin; |
| int status; |
| |
| set_sockaddr(&sin, servaddr, mount_port); |
| if (nfs_data.flags & NFS_MOUNT_VER3) |
| status = nfs3_mount(&sin, nfs_path, &nfs_data.root); |
| else |
| status = nfs_mount(&sin, nfs_path, &nfs_data.root); |
| if (status < 0) |
| printk(KERN_ERR "Root-NFS: Server returned error %d " |
| "while mounting %s\n", status, nfs_path); |
| |
| return status; |
| } |
| |
| /* |
| * Get the NFS port numbers and file handle, and return the prepared 'data' |
| * argument for mount() if everything went OK. Return NULL otherwise. |
| */ |
| void * __init nfs_root_data(void) |
| { |
| if (root_nfs_init() < 0 |
| || root_nfs_ports() < 0 |
| || root_nfs_get_handle() < 0) |
| return NULL; |
| set_sockaddr((struct sockaddr_in *) &nfs_data.addr, servaddr, nfs_port); |
| return (void*)&nfs_data; |
| } |