1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This file contains all the stubs needed when communicating with lockd. 4 * This level of indirection is necessary so we can run nfsd+lockd without 5 * requiring the nfs client to be compiled in/loaded, and vice versa. 6 * 7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> 8 */ 9 10 #include <linux/file.h> 11 #include <linux/lockd/bind.h> 12 #include "nfsd.h" 13 #include "vfs.h" 14 15 #define NFSDDBG_FACILITY NFSDDBG_LOCKD 16 17 #ifdef CONFIG_LOCKD_V4 18 #define nlm_stale_fh nlm4_stale_fh 19 #define nlm_failed nlm4_failed 20 #else 21 #define nlm_stale_fh nlm_lck_denied_nolocks 22 #define nlm_failed nlm_lck_denied_nolocks 23 #endif 24 /* 25 * Note: we hold the dentry use count while the file is open. 26 */ 27 static __be32 28 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp, 29 int mode) 30 { 31 __be32 nfserr; 32 int access; 33 struct svc_fh fh; 34 35 /* must initialize before using! but maxsize doesn't matter */ 36 fh_init(&fh,0); 37 fh.fh_handle.fh_size = f->size; 38 memcpy(&fh.fh_handle.fh_raw, f->data, f->size); 39 fh.fh_export = NULL; 40 41 /* 42 * Allow BYPASS_GSS as some client implementations use AUTH_SYS 43 * for NLM even when GSS is used for NFS. 44 * Allow OWNER_OVERRIDE as permission might have been changed 45 * after the file was opened. 46 * Pass MAY_NLM so that authentication can be completely bypassed 47 * if NFSEXP_NOAUTHNLM is set. Some older clients use AUTH_NULL 48 * for NLM requests. 49 */ 50 access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ; 51 access |= NFSD_MAY_NLM | NFSD_MAY_OWNER_OVERRIDE | NFSD_MAY_BYPASS_GSS; 52 nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp); 53 fh_put(&fh); 54 /* We return nlm error codes as nlm doesn't know 55 * about nfsd, but nfsd does know about nlm.. 56 */ 57 switch (nfserr) { 58 case nfs_ok: 59 return 0; 60 case nfserr_dropit: 61 return nlm_drop_reply; 62 case nfserr_stale: 63 return nlm_stale_fh; 64 default: 65 return nlm_failed; 66 } 67 } 68 69 static void 70 nlm_fclose(struct file *filp) 71 { 72 fput(filp); 73 } 74 75 static const struct nlmsvc_binding nfsd_nlm_ops = { 76 .fopen = nlm_fopen, /* open file for locking */ 77 .fclose = nlm_fclose, /* close file */ 78 }; 79 80 void 81 nfsd_lockd_init(void) 82 { 83 dprintk("nfsd: initializing lockd\n"); 84 nlmsvc_ops = &nfsd_nlm_ops; 85 } 86 87 void 88 nfsd_lockd_shutdown(void) 89 { 90 nlmsvc_ops = NULL; 91 } 92