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/* * include/linux/nfsd/nfsfh.h * * This file describes the layout of the file handles as passed * over the wire. * * Earlier versions of knfsd used to sign file handles using keyed MD5 * or SHA. I've removed this code, because it doesn't give you more * security than blocking external access to port 2049 on your firewall. * * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */ #ifndef _LINUX_NFSD_FH_H #define _LINUX_NFSD_FH_H #include <asm/types.h> #ifdef __KERNEL__ # include <linux/config.h> # include <linux/types.h> # include <linux/string.h> # include <linux/fs.h> #endif #include <linux/nfsd/const.h> #include <linux/nfsd/debug.h> /* * This is the old "dentry style" Linux NFSv2 file handle. * * The xino and xdev fields are currently used to transport the * ino/dev of the exported inode. */ struct nfs_fhbase_old { __u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */ __u32 fb_ino; /* our inode number */ __u32 fb_dirino; /* dir inode number, 0 for directories */ __u32 fb_dev; /* our device */ __u32 fb_xdev; __u32 fb_xino; __u32 fb_generation; }; /* * This is the new flexible, extensible style NFSv2/v3 file handle. * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000 * * The file handle is seens as a list of 4byte words. * The first word contains a version number (1) and four descriptor bytes * that tell how the remaining 3 variable length fields should be handled. * These three bytes are auth_type, fsid_type and fileid_type. * * All 4byte values are in host-byte-order. * * The auth_type field specifies how the filehandle can be authenticated * This might allow a file to be confirmed to be in a writable part of a * filetree without checking the path from it upto the root. * Current values: * 0 - No authentication. fb_auth is 0 bytes long * Possible future values: * 1 - 4 bytes taken from MD5 hash of the remainer of the file handle * prefixed by a secret and with the important export flags. * * The fsid_type identifies how the filesystem (or export point) is * encoded. * Current values: * 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number * NOTE: we cannot use the kdev_t device id value, because kdev_t.h * says we mustn't. We must break it up and reassemble. * 1 - 4 byte user specified identifier * 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED * 3 - 4 byte device id, encoded for user-space, 4 byte inode number * * The fileid_type identified how the file within the filesystem is encoded. * This is (will be) passed to, and set by, the underlying filesystem if it supports * filehandle operations. The filesystem must not use the value '0' or '0xff' and may * only use the values 1 and 2 as defined below: * Current values: * 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes. * 1 - 32bit inode number, 32 bit generation number. * 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number. * */ struct nfs_fhbase_new { __u8 fb_version; /* == 1, even => nfs_fhbase_old */ __u8 fb_auth_type; __u8 fb_fsid_type; __u8 fb_fileid_type; __u32 fb_auth[1]; /* __u32 fb_fsid[0]; floating */ /* __u32 fb_fileid[0]; floating */ }; struct knfsd_fh { unsigned int fh_size; /* significant for NFSv3. * Points to the current size while building * a new file handle */ union { struct nfs_fhbase_old fh_old; __u32 fh_pad[NFS4_FHSIZE/4]; struct nfs_fhbase_new fh_new; } fh_base; }; #define ofh_dcookie fh_base.fh_old.fb_dcookie #define ofh_ino fh_base.fh_old.fb_ino #define ofh_dirino fh_base.fh_old.fb_dirino #define ofh_dev fh_base.fh_old.fb_dev #define ofh_xdev fh_base.fh_old.fb_xdev #define ofh_xino fh_base.fh_old.fb_xino #define ofh_generation fh_base.fh_old.fb_generation #define fh_version fh_base.fh_new.fb_version #define fh_fsid_type fh_base.fh_new.fb_fsid_type #define fh_auth_type fh_base.fh_new.fb_auth_type #define fh_fileid_type fh_base.fh_new.fb_fileid_type #define fh_auth fh_base.fh_new.fb_auth #define fh_fsid fh_base.fh_new.fb_auth #ifdef __KERNEL__ static inline __u32 ino_t_to_u32(ino_t ino) { return (__u32) ino; } static inline ino_t u32_to_ino_t(__u32 uino) { return (ino_t) uino; } /* * This is the internal representation of an NFS handle used in knfsd. * pre_mtime/post_version will be used to support wcc_attr's in NFSv3. */ typedef struct svc_fh { struct knfsd_fh fh_handle; /* FH data */ struct dentry * fh_dentry; /* validated dentry */ struct svc_export * fh_export; /* export pointer */ int fh_maxsize; /* max size for fh_handle */ unsigned char fh_locked; /* inode locked by us */ #ifdef CONFIG_NFSD_V3 unsigned char fh_post_saved; /* post-op attrs saved */ unsigned char fh_pre_saved; /* pre-op attrs saved */ /* Pre-op attributes saved during fh_lock */ __u64 fh_pre_size; /* size before operation */ struct timespec fh_pre_mtime; /* mtime before oper */ struct timespec fh_pre_ctime; /* ctime before oper */ /* Post-op attributes saved in fh_unlock */ umode_t fh_post_mode; /* i_mode */ nlink_t fh_post_nlink; /* i_nlink */ uid_t fh_post_uid; /* i_uid */ gid_t fh_post_gid; /* i_gid */ __u64 fh_post_size; /* i_size */ unsigned long fh_post_blocks; /* i_blocks */ unsigned long fh_post_blksize;/* i_blksize */ __u32 fh_post_rdev[2];/* i_rdev */ struct timespec fh_post_atime; /* i_atime */ struct timespec fh_post_mtime; /* i_mtime */ struct timespec fh_post_ctime; /* i_ctime */ #endif /* CONFIG_NFSD_V3 */ } svc_fh; static inline void mk_fsid_v0(u32 *fsidv, dev_t dev, ino_t ino) { fsidv[0] = htonl((MAJOR(dev)<<16) | MINOR(dev)); fsidv[1] = ino_t_to_u32(ino); } static inline void mk_fsid_v1(u32 *fsidv, u32 fsid) { fsidv[0] = fsid; } static inline void mk_fsid_v2(u32 *fsidv, dev_t dev, ino_t ino) { fsidv[0] = htonl(MAJOR(dev)); fsidv[1] = htonl(MINOR(dev)); fsidv[2] = ino_t_to_u32(ino); } static inline void mk_fsid_v3(u32 *fsidv, dev_t dev, ino_t ino) { fsidv[0] = new_encode_dev(dev); fsidv[1] = ino_t_to_u32(ino); } static inline int key_len(int type) { switch(type) { case 0: return 8; case 1: return 4; case 2: return 12; case 3: return 8; default: return 0; } } /* * Shorthand for dprintk()'s */ extern char * SVCFH_fmt(struct svc_fh *fhp); /* * Function prototypes */ u32 fh_verify(struct svc_rqst *, struct svc_fh *, int, int); int fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *); int fh_update(struct svc_fh *); void fh_put(struct svc_fh *); static __inline__ struct svc_fh * fh_copy(struct svc_fh *dst, struct svc_fh *src) { if (src->fh_dentry || src->fh_locked) { struct dentry *dentry = src->fh_dentry; printk(KERN_ERR "fh_copy: copying %s/%s, already verified!\n", dentry->d_parent->d_name.name, dentry->d_name.name); } *dst = *src; return dst; } static __inline__ struct svc_fh * fh_init(struct svc_fh *fhp, int maxsize) { memset(fhp, 0, sizeof(*fhp)); fhp->fh_maxsize = maxsize; return fhp; } #ifdef CONFIG_NFSD_V3 /* * Fill in the pre_op attr for the wcc data */ static inline void fill_pre_wcc(struct svc_fh *fhp) { struct inode *inode; inode = fhp->fh_dentry->d_inode; if (!fhp->fh_pre_saved) { fhp->fh_pre_mtime = inode->i_mtime; fhp->fh_pre_ctime = inode->i_ctime; fhp->fh_pre_size = inode->i_size; fhp->fh_pre_saved = 1; } } /* * Fill in the post_op attr for the wcc data */ static inline void fill_post_wcc(struct svc_fh *fhp) { struct inode *inode = fhp->fh_dentry->d_inode; if (fhp->fh_post_saved) printk("nfsd: inode locked twice during operation.\n"); fhp->fh_post_mode = inode->i_mode; fhp->fh_post_nlink = inode->i_nlink; fhp->fh_post_uid = inode->i_uid; fhp->fh_post_gid = inode->i_gid; fhp->fh_post_size = inode->i_size; if (inode->i_blksize) { fhp->fh_post_blksize = inode->i_blksize; fhp->fh_post_blocks = inode->i_blocks; } else { fhp->fh_post_blksize = BLOCK_SIZE; /* how much do we care for accuracy with MinixFS? */ fhp->fh_post_blocks = (inode->i_size+511) >> 9; } fhp->fh_post_rdev[0] = htonl((u32)imajor(inode)); fhp->fh_post_rdev[1] = htonl((u32)iminor(inode)); fhp->fh_post_atime = inode->i_atime; fhp->fh_post_mtime = inode->i_mtime; fhp->fh_post_ctime = inode->i_ctime; fhp->fh_post_saved = 1; } #else #define fill_pre_wcc(ignored) #define fill_post_wcc(notused) #endif /* CONFIG_NFSD_V3 */ /* * Lock a file handle/inode * NOTE: both fh_lock and fh_unlock are done "by hand" in * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once * so, any changes here should be reflected there. */ static inline void fh_lock(struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; struct inode *inode; dfprintk(FILEOP, "nfsd: fh_lock(%s) locked = %d\n", SVCFH_fmt(fhp), fhp->fh_locked); if (!fhp->fh_dentry) { printk(KERN_ERR "fh_lock: fh not verified!\n"); return; } if (fhp->fh_locked) { printk(KERN_WARNING "fh_lock: %s/%s already locked!\n", dentry->d_parent->d_name.name, dentry->d_name.name); return; } inode = dentry->d_inode; mutex_lock(&inode->i_mutex); fill_pre_wcc(fhp); fhp->fh_locked = 1; } /* * Unlock a file handle/inode */ static inline void fh_unlock(struct svc_fh *fhp) { if (!fhp->fh_dentry) printk(KERN_ERR "fh_unlock: fh not verified!\n"); if (fhp->fh_locked) { fill_post_wcc(fhp); mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex); fhp->fh_locked = 0; } } #endif /* __KERNEL__ */ #endif /* _LINUX_NFSD_FH_H */