636 lines
14 KiB
C
636 lines
14 KiB
C
/*
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* linux/fs/lockd/xdr.c
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*
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* XDR support for lockd and the lock client.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/utsname.h>
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#include <linux/nfs.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/lockd/lockd.h>
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#include <linux/lockd/sm_inter.h>
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#define NLMDBG_FACILITY NLMDBG_XDR
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static inline loff_t
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s32_to_loff_t(__s32 offset)
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{
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return (loff_t)offset;
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}
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static inline __s32
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loff_t_to_s32(loff_t offset)
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{
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__s32 res;
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if (offset >= NLM_OFFSET_MAX)
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res = NLM_OFFSET_MAX;
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else if (offset <= -NLM_OFFSET_MAX)
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res = -NLM_OFFSET_MAX;
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else
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res = offset;
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return res;
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}
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/*
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* XDR functions for basic NLM types
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*/
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static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
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{
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unsigned int len;
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len = ntohl(*p++);
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if(len==0)
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{
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c->len=4;
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memset(c->data, 0, 4); /* hockeypux brain damage */
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}
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else if(len<=NLM_MAXCOOKIELEN)
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{
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c->len=len;
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memcpy(c->data, p, len);
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p+=XDR_QUADLEN(len);
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}
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else
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{
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printk(KERN_NOTICE
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"lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN);
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return NULL;
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}
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return p;
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}
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static inline __be32 *
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nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
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{
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*p++ = htonl(c->len);
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memcpy(p, c->data, c->len);
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p+=XDR_QUADLEN(c->len);
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return p;
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}
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static __be32 *
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nlm_decode_fh(__be32 *p, struct nfs_fh *f)
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{
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unsigned int len;
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if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
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printk(KERN_NOTICE
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"lockd: bad fhandle size %d (should be %d)\n",
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len, NFS2_FHSIZE);
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return NULL;
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}
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f->size = NFS2_FHSIZE;
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memset(f->data, 0, sizeof(f->data));
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memcpy(f->data, p, NFS2_FHSIZE);
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return p + XDR_QUADLEN(NFS2_FHSIZE);
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}
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static inline __be32 *
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nlm_encode_fh(__be32 *p, struct nfs_fh *f)
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{
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*p++ = htonl(NFS2_FHSIZE);
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memcpy(p, f->data, NFS2_FHSIZE);
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return p + XDR_QUADLEN(NFS2_FHSIZE);
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}
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/*
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* Encode and decode owner handle
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*/
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static inline __be32 *
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nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
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{
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return xdr_decode_netobj(p, oh);
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}
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static inline __be32 *
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nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
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{
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return xdr_encode_netobj(p, oh);
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}
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static __be32 *
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nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
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{
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struct file_lock *fl = &lock->fl;
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s32 start, len, end;
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if (!(p = xdr_decode_string_inplace(p, &lock->caller,
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&lock->len,
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NLM_MAXSTRLEN))
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|| !(p = nlm_decode_fh(p, &lock->fh))
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|| !(p = nlm_decode_oh(p, &lock->oh)))
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return NULL;
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lock->svid = ntohl(*p++);
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locks_init_lock(fl);
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fl->fl_owner = current->files;
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fl->fl_pid = (pid_t)lock->svid;
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fl->fl_flags = FL_POSIX;
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fl->fl_type = F_RDLCK; /* as good as anything else */
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start = ntohl(*p++);
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len = ntohl(*p++);
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end = start + len - 1;
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fl->fl_start = s32_to_loff_t(start);
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if (len == 0 || end < 0)
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fl->fl_end = OFFSET_MAX;
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else
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fl->fl_end = s32_to_loff_t(end);
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return p;
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}
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/*
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* Encode a lock as part of an NLM call
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*/
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static __be32 *
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nlm_encode_lock(__be32 *p, struct nlm_lock *lock)
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{
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struct file_lock *fl = &lock->fl;
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__s32 start, len;
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if (!(p = xdr_encode_string(p, lock->caller))
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|| !(p = nlm_encode_fh(p, &lock->fh))
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|| !(p = nlm_encode_oh(p, &lock->oh)))
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return NULL;
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if (fl->fl_start > NLM_OFFSET_MAX
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|| (fl->fl_end > NLM_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
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return NULL;
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start = loff_t_to_s32(fl->fl_start);
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if (fl->fl_end == OFFSET_MAX)
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len = 0;
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else
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len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
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*p++ = htonl(lock->svid);
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*p++ = htonl(start);
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*p++ = htonl(len);
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return p;
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}
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/*
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* Encode result of a TEST/TEST_MSG call
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*/
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static __be32 *
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nlm_encode_testres(__be32 *p, struct nlm_res *resp)
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{
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s32 start, len;
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if (!(p = nlm_encode_cookie(p, &resp->cookie)))
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return NULL;
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*p++ = resp->status;
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if (resp->status == nlm_lck_denied) {
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struct file_lock *fl = &resp->lock.fl;
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*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
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*p++ = htonl(resp->lock.svid);
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/* Encode owner handle. */
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if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
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return NULL;
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start = loff_t_to_s32(fl->fl_start);
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if (fl->fl_end == OFFSET_MAX)
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len = 0;
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else
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len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
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*p++ = htonl(start);
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*p++ = htonl(len);
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}
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return p;
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}
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/*
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* First, the server side XDR functions
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*/
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int
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nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
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{
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u32 exclusive;
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if (!(p = nlm_decode_cookie(p, &argp->cookie)))
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return 0;
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exclusive = ntohl(*p++);
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if (!(p = nlm_decode_lock(p, &argp->lock)))
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return 0;
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if (exclusive)
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argp->lock.fl.fl_type = F_WRLCK;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
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{
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if (!(p = nlm_encode_testres(p, resp)))
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return 0;
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return xdr_ressize_check(rqstp, p);
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}
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int
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nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
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{
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u32 exclusive;
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if (!(p = nlm_decode_cookie(p, &argp->cookie)))
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return 0;
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argp->block = ntohl(*p++);
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exclusive = ntohl(*p++);
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if (!(p = nlm_decode_lock(p, &argp->lock)))
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return 0;
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if (exclusive)
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argp->lock.fl.fl_type = F_WRLCK;
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argp->reclaim = ntohl(*p++);
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argp->state = ntohl(*p++);
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argp->monitor = 1; /* monitor client by default */
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
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{
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u32 exclusive;
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if (!(p = nlm_decode_cookie(p, &argp->cookie)))
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return 0;
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argp->block = ntohl(*p++);
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exclusive = ntohl(*p++);
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if (!(p = nlm_decode_lock(p, &argp->lock)))
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return 0;
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if (exclusive)
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argp->lock.fl.fl_type = F_WRLCK;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
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{
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if (!(p = nlm_decode_cookie(p, &argp->cookie))
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|| !(p = nlm_decode_lock(p, &argp->lock)))
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return 0;
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argp->lock.fl.fl_type = F_UNLCK;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
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{
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struct nlm_lock *lock = &argp->lock;
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memset(lock, 0, sizeof(*lock));
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locks_init_lock(&lock->fl);
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lock->svid = ~(u32) 0;
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lock->fl.fl_pid = (pid_t)lock->svid;
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if (!(p = nlm_decode_cookie(p, &argp->cookie))
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|| !(p = xdr_decode_string_inplace(p, &lock->caller,
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&lock->len, NLM_MAXSTRLEN))
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|| !(p = nlm_decode_fh(p, &lock->fh))
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|| !(p = nlm_decode_oh(p, &lock->oh)))
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return 0;
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argp->fsm_mode = ntohl(*p++);
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argp->fsm_access = ntohl(*p++);
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
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{
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if (!(p = nlm_encode_cookie(p, &resp->cookie)))
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return 0;
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*p++ = resp->status;
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*p++ = xdr_zero; /* sequence argument */
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return xdr_ressize_check(rqstp, p);
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}
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int
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nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
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{
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if (!(p = nlm_encode_cookie(p, &resp->cookie)))
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return 0;
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*p++ = resp->status;
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return xdr_ressize_check(rqstp, p);
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}
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int
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nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
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{
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struct nlm_lock *lock = &argp->lock;
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if (!(p = xdr_decode_string_inplace(p, &lock->caller,
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&lock->len, NLM_MAXSTRLEN)))
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return 0;
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argp->state = ntohl(*p++);
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
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{
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if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
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return 0;
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argp->state = ntohl(*p++);
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/* Preserve the address in network byte order */
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argp->addr = *p++;
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argp->vers = *p++;
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argp->proto = *p++;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
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{
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if (!(p = nlm_decode_cookie(p, &resp->cookie)))
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return 0;
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resp->status = *p++;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
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{
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return xdr_argsize_check(rqstp, p);
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}
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int
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nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
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{
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return xdr_ressize_check(rqstp, p);
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}
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/*
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* Now, the client side XDR functions
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*/
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#ifdef NLMCLNT_SUPPORT_SHARES
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static int
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nlmclt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
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{
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return 0;
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}
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#endif
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static int
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nlmclt_encode_testargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
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{
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struct nlm_lock *lock = &argp->lock;
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if (!(p = nlm_encode_cookie(p, &argp->cookie)))
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return -EIO;
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*p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
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if (!(p = nlm_encode_lock(p, lock)))
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return -EIO;
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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static int
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nlmclt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
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{
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if (!(p = nlm_decode_cookie(p, &resp->cookie)))
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return -EIO;
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resp->status = *p++;
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if (resp->status == nlm_lck_denied) {
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struct file_lock *fl = &resp->lock.fl;
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u32 excl;
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s32 start, len, end;
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memset(&resp->lock, 0, sizeof(resp->lock));
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locks_init_lock(fl);
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excl = ntohl(*p++);
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resp->lock.svid = ntohl(*p++);
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fl->fl_pid = (pid_t)resp->lock.svid;
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if (!(p = nlm_decode_oh(p, &resp->lock.oh)))
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return -EIO;
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fl->fl_flags = FL_POSIX;
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fl->fl_type = excl? F_WRLCK : F_RDLCK;
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start = ntohl(*p++);
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len = ntohl(*p++);
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end = start + len - 1;
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fl->fl_start = s32_to_loff_t(start);
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if (len == 0 || end < 0)
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fl->fl_end = OFFSET_MAX;
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else
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fl->fl_end = s32_to_loff_t(end);
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}
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return 0;
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}
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static int
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nlmclt_encode_lockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
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{
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struct nlm_lock *lock = &argp->lock;
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if (!(p = nlm_encode_cookie(p, &argp->cookie)))
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return -EIO;
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*p++ = argp->block? xdr_one : xdr_zero;
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*p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
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if (!(p = nlm_encode_lock(p, lock)))
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return -EIO;
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*p++ = argp->reclaim? xdr_one : xdr_zero;
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*p++ = htonl(argp->state);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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static int
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nlmclt_encode_cancargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
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{
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struct nlm_lock *lock = &argp->lock;
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if (!(p = nlm_encode_cookie(p, &argp->cookie)))
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return -EIO;
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*p++ = argp->block? xdr_one : xdr_zero;
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*p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
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if (!(p = nlm_encode_lock(p, lock)))
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return -EIO;
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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static int
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nlmclt_encode_unlockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
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{
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struct nlm_lock *lock = &argp->lock;
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if (!(p = nlm_encode_cookie(p, &argp->cookie)))
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return -EIO;
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if (!(p = nlm_encode_lock(p, lock)))
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return -EIO;
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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static int
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nlmclt_encode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
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{
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if (!(p = nlm_encode_cookie(p, &resp->cookie)))
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return -EIO;
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*p++ = resp->status;
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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static int
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nlmclt_encode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
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{
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if (!(p = nlm_encode_testres(p, resp)))
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return -EIO;
|
|
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nlmclt_decode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
|
|
{
|
|
if (!(p = nlm_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
|
|
|
|
/*
|
|
* Buffer requirements for NLM
|
|
*/
|
|
#define NLM_void_sz 0
|
|
#define NLM_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
|
|
#define NLM_caller_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE)
|
|
#define NLM_owner_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE)
|
|
#define NLM_fhandle_sz 1+XDR_QUADLEN(NFS2_FHSIZE)
|
|
#define NLM_lock_sz 3+NLM_caller_sz+NLM_owner_sz+NLM_fhandle_sz
|
|
#define NLM_holder_sz 4+NLM_owner_sz
|
|
|
|
#define NLM_testargs_sz NLM_cookie_sz+1+NLM_lock_sz
|
|
#define NLM_lockargs_sz NLM_cookie_sz+4+NLM_lock_sz
|
|
#define NLM_cancargs_sz NLM_cookie_sz+2+NLM_lock_sz
|
|
#define NLM_unlockargs_sz NLM_cookie_sz+NLM_lock_sz
|
|
|
|
#define NLM_testres_sz NLM_cookie_sz+1+NLM_holder_sz
|
|
#define NLM_res_sz NLM_cookie_sz+1
|
|
#define NLM_norep_sz 0
|
|
|
|
/*
|
|
* For NLM, a void procedure really returns nothing
|
|
*/
|
|
#define nlmclt_decode_norep NULL
|
|
|
|
#define PROC(proc, argtype, restype) \
|
|
[NLMPROC_##proc] = { \
|
|
.p_proc = NLMPROC_##proc, \
|
|
.p_encode = (kxdrproc_t) nlmclt_encode_##argtype, \
|
|
.p_decode = (kxdrproc_t) nlmclt_decode_##restype, \
|
|
.p_arglen = NLM_##argtype##_sz, \
|
|
.p_replen = NLM_##restype##_sz, \
|
|
.p_statidx = NLMPROC_##proc, \
|
|
.p_name = #proc, \
|
|
}
|
|
|
|
static struct rpc_procinfo nlm_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
|
|
};
|
|
|
|
static struct rpc_version nlm_version1 = {
|
|
.number = 1,
|
|
.nrprocs = 16,
|
|
.procs = nlm_procedures,
|
|
};
|
|
|
|
static struct rpc_version nlm_version3 = {
|
|
.number = 3,
|
|
.nrprocs = 24,
|
|
.procs = nlm_procedures,
|
|
};
|
|
|
|
static struct rpc_version * nlm_versions[] = {
|
|
[1] = &nlm_version1,
|
|
[3] = &nlm_version3,
|
|
#ifdef CONFIG_LOCKD_V4
|
|
[4] = &nlm_version4,
|
|
#endif
|
|
};
|
|
|
|
static struct rpc_stat nlm_stats;
|
|
|
|
struct rpc_program nlm_program = {
|
|
.name = "lockd",
|
|
.number = NLM_PROGRAM,
|
|
.nrvers = ARRAY_SIZE(nlm_versions),
|
|
.version = nlm_versions,
|
|
.stats = &nlm_stats,
|
|
};
|
|
|
|
#ifdef RPC_DEBUG
|
|
const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie)
|
|
{
|
|
/*
|
|
* We can get away with a static buffer because we're only
|
|
* called with BKL held.
|
|
*/
|
|
static char buf[2*NLM_MAXCOOKIELEN+1];
|
|
int i;
|
|
int len = sizeof(buf);
|
|
char *p = buf;
|
|
|
|
len--; /* allow for trailing \0 */
|
|
if (len < 3)
|
|
return "???";
|
|
for (i = 0 ; i < cookie->len ; i++) {
|
|
if (len < 2) {
|
|
strcpy(p-3, "...");
|
|
break;
|
|
}
|
|
sprintf(p, "%02x", cookie->data[i]);
|
|
p += 2;
|
|
len -= 2;
|
|
}
|
|
*p = '\0';
|
|
|
|
return buf;
|
|
}
|
|
#endif
|