/* * linux/fs/lockd/xdr4.c * * XDR support for lockd and the lock client. * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no> */ #include <linux/types.h> #include <linux/sched.h> #include <linux/nfs.h> #include <linux/sunrpc/xdr.h> #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/svc.h> #include <linux/sunrpc/stats.h> #include <linux/lockd/lockd.h> #define NLMDBG_FACILITY NLMDBG_XDR static inline loff_t s64_to_loff_t(__s64 offset) { return (loff_t)offset; } static inline s64 loff_t_to_s64(loff_t offset) { s64 res; if (offset > NLM4_OFFSET_MAX) res = NLM4_OFFSET_MAX; else if (offset < -NLM4_OFFSET_MAX) res = -NLM4_OFFSET_MAX; else res = offset; return res; } /* * XDR functions for basic NLM types */ static __be32 * nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c) { unsigned int len; len = ntohl(*p++); if(len==0) { c->len=4; memset(c->data, 0, 4); /* hockeypux brain damage */ } else if(len<=NLM_MAXCOOKIELEN) { c->len=len; memcpy(c->data, p, len); p+=XDR_QUADLEN(len); } else { dprintk("lockd: bad cookie size %d (only cookies under " "%d bytes are supported.)\n", len, NLM_MAXCOOKIELEN); return NULL; } return p; } static __be32 * nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c) { *p++ = htonl(c->len); memcpy(p, c->data, c->len); p+=XDR_QUADLEN(c->len); return p; } static __be32 * nlm4_decode_fh(__be32 *p, struct nfs_fh *f) { memset(f->data, 0, sizeof(f->data)); f->size = ntohl(*p++); if (f->size > NFS_MAXFHSIZE) { dprintk("lockd: bad fhandle size %d (should be <=%d)\n", f->size, NFS_MAXFHSIZE); return NULL; } memcpy(f->data, p, f->size); return p + XDR_QUADLEN(f->size); } static __be32 * nlm4_encode_fh(__be32 *p, struct nfs_fh *f) { *p++ = htonl(f->size); if (f->size) p[XDR_QUADLEN(f->size)-1] = 0; /* don't leak anything */ memcpy(p, f->data, f->size); return p + XDR_QUADLEN(f->size); } /* * Encode and decode owner handle */ static __be32 * nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh) { return xdr_decode_netobj(p, oh); } static __be32 * nlm4_encode_oh(__be32 *p, struct xdr_netobj *oh) { return xdr_encode_netobj(p, oh); } static __be32 * nlm4_decode_lock(__be32 *p, struct nlm_lock *lock) { struct file_lock *fl = &lock->fl; __u64 len, start; __s64 end; if (!(p = xdr_decode_string_inplace(p, &lock->caller, &lock->len, NLM_MAXSTRLEN)) || !(p = nlm4_decode_fh(p, &lock->fh)) || !(p = nlm4_decode_oh(p, &lock->oh))) return NULL; lock->svid = ntohl(*p++); locks_init_lock(fl); fl->fl_owner = current->files; fl->fl_pid = (pid_t)lock->svid; fl->fl_flags = FL_POSIX; fl->fl_type = F_RDLCK; /* as good as anything else */ p = xdr_decode_hyper(p, &start); p = xdr_decode_hyper(p, &len); end = start + len - 1; fl->fl_start = s64_to_loff_t(start); if (len == 0 || end < 0) fl->fl_end = OFFSET_MAX; else fl->fl_end = s64_to_loff_t(end); return p; } /* * Encode a lock as part of an NLM call */ static __be32 * nlm4_encode_lock(__be32 *p, struct nlm_lock *lock) { struct file_lock *fl = &lock->fl; __s64 start, len; if (!(p = xdr_encode_string(p, lock->caller)) || !(p = nlm4_encode_fh(p, &lock->fh)) || !(p = nlm4_encode_oh(p, &lock->oh))) return NULL; if (fl->fl_start > NLM4_OFFSET_MAX || (fl->fl_end > NLM4_OFFSET_MAX && fl->fl_end != OFFSET_MAX)) return NULL; *p++ = htonl(lock->svid); start = loff_t_to_s64(fl->fl_start); if (fl->fl_end == OFFSET_MAX) len = 0; else len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1); p = xdr_encode_hyper(p, start); p = xdr_encode_hyper(p, len); return p; } /* * Encode result of a TEST/TEST_MSG call */ static __be32 * nlm4_encode_testres(__be32 *p, struct nlm_res *resp) { s64 start, len; dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp); if (!(p = nlm4_encode_cookie(p, &resp->cookie))) return NULL; *p++ = resp->status; if (resp->status == nlm_lck_denied) { struct file_lock *fl = &resp->lock.fl; *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one; *p++ = htonl(resp->lock.svid); /* Encode owner handle. */ if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) return NULL; start = loff_t_to_s64(fl->fl_start); if (fl->fl_end == OFFSET_MAX) len = 0; else len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1); p = xdr_encode_hyper(p, start); p = xdr_encode_hyper(p, len); dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n", resp->status, (int)resp->lock.svid, fl->fl_type, (long long)fl->fl_start, (long long)fl->fl_end); } dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp); return p; } /* * First, the server side XDR functions */ int nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) { u32 exclusive; if (!(p = nlm4_decode_cookie(p, &argp->cookie))) return 0; exclusive = ntohl(*p++); if (!(p = nlm4_decode_lock(p, &argp->lock))) return 0; if (exclusive) argp->lock.fl.fl_type = F_WRLCK; return xdr_argsize_check(rqstp, p); } int nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) { if (!(p = nlm4_encode_testres(p, resp))) return 0; return xdr_ressize_check(rqstp, p); } int nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) { u32 exclusive; if (!(p = nlm4_decode_cookie(p, &argp->cookie))) return 0; argp->block = ntohl(*p++); exclusive = ntohl(*p++); if (!(p = nlm4_decode_lock(p, &argp->lock))) return 0; if (exclusive) argp->lock.fl.fl_type = F_WRLCK; argp->reclaim = ntohl(*p++); argp->state = ntohl(*p++); argp->monitor = 1; /* monitor client by default */ return xdr_argsize_check(rqstp, p); } int nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) { u32 exclusive; if (!(p = nlm4_decode_cookie(p, &argp->cookie))) return 0; argp->block = ntohl(*p++); exclusive = ntohl(*p++); if (!(p = nlm4_decode_lock(p, &argp->lock))) return 0; if (exclusive) argp->lock.fl.fl_type = F_WRLCK; return xdr_argsize_check(rqstp, p); } int nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) { if (!(p = nlm4_decode_cookie(p, &argp->cookie)) || !(p = nlm4_decode_lock(p, &argp->lock))) return 0; argp->lock.fl.fl_type = F_UNLCK; return xdr_argsize_check(rqstp, p); } int nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) { struct nlm_lock *lock = &argp->lock; memset(lock, 0, sizeof(*lock)); locks_init_lock(&lock->fl); lock->svid = ~(u32) 0; lock->fl.fl_pid = (pid_t)lock->svid; if (!(p = nlm4_decode_cookie(p, &argp->cookie)) || !(p = xdr_decode_string_inplace(p, &lock->caller, &lock->len, NLM_MAXSTRLEN)) || !(p = nlm4_decode_fh(p, &lock->fh)) || !(p = nlm4_decode_oh(p, &lock->oh))) return 0; argp->fsm_mode = ntohl(*p++); argp->fsm_access = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) { if (!(p = nlm4_encode_cookie(p, &resp->cookie))) return 0; *p++ = resp->status; *p++ = xdr_zero; /* sequence argument */ return xdr_ressize_check(rqstp, p); } int nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) { if (!(p = nlm4_encode_cookie(p, &resp->cookie))) return 0; *p++ = resp->status; return xdr_ressize_check(rqstp, p); } int nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp) { struct nlm_lock *lock = &argp->lock; if (!(p = xdr_decode_string_inplace(p, &lock->caller, &lock->len, NLM_MAXSTRLEN))) return 0; argp->state = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp) { if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN))) return 0; argp->state = ntohl(*p++); memcpy(&argp->priv.data, p, sizeof(argp->priv.data)); p += XDR_QUADLEN(SM_PRIV_SIZE); return xdr_argsize_check(rqstp, p); } int nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) { if (!(p = nlm4_decode_cookie(p, &resp->cookie))) return 0; resp->status = *p++; return xdr_argsize_check(rqstp, p); } int nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) { return xdr_argsize_check(rqstp, p); } int nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) { return xdr_ressize_check(rqstp, p); } /* * Now, the client side XDR functions */ #ifdef NLMCLNT_SUPPORT_SHARES static int nlm4clt_decode_void(struct rpc_rqst *req, __be32 *p, void *ptr) { return 0; } #endif static int nlm4clt_encode_testargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp) { struct nlm_lock *lock = &argp->lock; if (!(p = nlm4_encode_cookie(p, &argp->cookie))) return -EIO; *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; if (!(p = nlm4_encode_lock(p, lock))) return -EIO; req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); return 0; } static int nlm4clt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp) { if (!(p = nlm4_decode_cookie(p, &resp->cookie))) return -EIO; resp->status = *p++; if (resp->status == nlm_lck_denied) { struct file_lock *fl = &resp->lock.fl; u32 excl; __u64 start, len; __s64 end; memset(&resp->lock, 0, sizeof(resp->lock)); locks_init_lock(fl); excl = ntohl(*p++); resp->lock.svid = ntohl(*p++); fl->fl_pid = (pid_t)resp->lock.svid; if (!(p = nlm4_decode_oh(p, &resp->lock.oh))) return -EIO; fl->fl_flags = FL_POSIX; fl->fl_type = excl? F_WRLCK : F_RDLCK; p = xdr_decode_hyper(p, &start); p = xdr_decode_hyper(p, &len); end = start + len - 1; fl->fl_start = s64_to_loff_t(start); if (len == 0 || end < 0) fl->fl_end = OFFSET_MAX; else fl->fl_end = s64_to_loff_t(end); } return 0; } static int nlm4clt_encode_lockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp) { struct nlm_lock *lock = &argp->lock; if (!(p = nlm4_encode_cookie(p, &argp->cookie))) return -EIO; *p++ = argp->block? xdr_one : xdr_zero; *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; if (!(p = nlm4_encode_lock(p, lock))) return -EIO; *p++ = argp->reclaim? xdr_one : xdr_zero; *p++ = htonl(argp->state); req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); return 0; } static int nlm4clt_encode_cancargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp) { struct nlm_lock *lock = &argp->lock; if (!(p = nlm4_encode_cookie(p, &argp->cookie))) return -EIO; *p++ = argp->block? xdr_one : xdr_zero; *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero; if (!(p = nlm4_encode_lock(p, lock))) return -EIO; req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); return 0; } static int nlm4clt_encode_unlockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp) { struct nlm_lock *lock = &argp->lock; if (!(p = nlm4_encode_cookie(p, &argp->cookie))) return -EIO; if (!(p = nlm4_encode_lock(p, lock))) return -EIO; req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); return 0; } static int nlm4clt_encode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp) { if (!(p = nlm4_encode_cookie(p, &resp->cookie))) return -EIO; *p++ = resp->status; req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); return 0; } static int nlm4clt_encode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp) { if (!(p = nlm4_encode_testres(p, resp))) return -EIO; req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); return 0; } static int nlm4clt_decode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp) { if (!(p = nlm4_decode_cookie(p, &resp->cookie))) return -EIO; resp->status = *p++; return 0; } #if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ) # error "NLM host name cannot be larger than XDR_MAX_NETOBJ!" #endif #if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN) # error "NLM host name cannot be larger than NLM's maximum string length!" #endif /* * Buffer requirements for NLM */ #define NLM4_void_sz 0 #define NLM4_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN) #define NLM4_caller_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE) #define NLM4_owner_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE) #define NLM4_fhandle_sz 1+XDR_QUADLEN(NFS3_FHSIZE) #define NLM4_lock_sz 5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz #define NLM4_holder_sz 6+NLM4_owner_sz #define NLM4_testargs_sz NLM4_cookie_sz+1+NLM4_lock_sz #define NLM4_lockargs_sz NLM4_cookie_sz+4+NLM4_lock_sz #define NLM4_cancargs_sz NLM4_cookie_sz+2+NLM4_lock_sz #define NLM4_unlockargs_sz NLM4_cookie_sz+NLM4_lock_sz #define NLM4_testres_sz NLM4_cookie_sz+1+NLM4_holder_sz #define NLM4_res_sz NLM4_cookie_sz+1 #define NLM4_norep_sz 0 /* * For NLM, a void procedure really returns nothing */ #define nlm4clt_decode_norep NULL #define PROC(proc, argtype, restype) \ [NLMPROC_##proc] = { \ .p_proc = NLMPROC_##proc, \ .p_encode = (kxdrproc_t) nlm4clt_encode_##argtype, \ .p_decode = (kxdrproc_t) nlm4clt_decode_##restype, \ .p_arglen = NLM4_##argtype##_sz, \ .p_replen = NLM4_##restype##_sz, \ .p_statidx = NLMPROC_##proc, \ .p_name = #proc, \ } static struct rpc_procinfo nlm4_procedures[] = { PROC(TEST, testargs, testres), PROC(LOCK, lockargs, res), PROC(CANCEL, cancargs, res), PROC(UNLOCK, unlockargs, res), PROC(GRANTED, testargs, res), PROC(TEST_MSG, testargs, norep), PROC(LOCK_MSG, lockargs, norep), PROC(CANCEL_MSG, cancargs, norep), PROC(UNLOCK_MSG, unlockargs, norep), PROC(GRANTED_MSG, testargs, norep), PROC(TEST_RES, testres, norep), PROC(LOCK_RES, res, norep), PROC(CANCEL_RES, res, norep), PROC(UNLOCK_RES, res, norep), PROC(GRANTED_RES, res, norep), #ifdef NLMCLNT_SUPPORT_SHARES PROC(SHARE, shareargs, shareres), PROC(UNSHARE, shareargs, shareres), PROC(NM_LOCK, lockargs, res), PROC(FREE_ALL, notify, void), #endif }; struct rpc_version nlm_version4 = { .number = 4, .nrprocs = 24, .procs = nlm4_procedures, };