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DEFINITIONS
This source file includes following definitions.
- s32_to_loff_t
- loff_t_to_s32
- nlm_decode_cookie
- nlm_encode_cookie
- nlm_decode_fh
- nlm_encode_fh
- nlm_decode_oh
- nlm_encode_oh
- nlm_decode_lock
- nlm_encode_lock
- nlm_encode_testres
- nlmsvc_decode_testargs
- nlmsvc_encode_testres
- nlmsvc_decode_lockargs
- nlmsvc_decode_cancargs
- nlmsvc_decode_unlockargs
- nlmsvc_decode_shareargs
- nlmsvc_encode_shareres
- nlmsvc_encode_res
- nlmsvc_decode_notify
- nlmsvc_decode_reboot
- nlmsvc_decode_res
- nlmsvc_decode_void
- nlmsvc_encode_void
- nlmclt_decode_void
- nlmclt_encode_testargs
- nlmclt_decode_testres
- nlmclt_encode_lockargs
- nlmclt_encode_cancargs
- nlmclt_encode_unlockargs
- nlmclt_encode_res
- nlmclt_encode_testres
- nlmclt_decode_res
- nlmdbg_cookie2a
/*
* linux/fs/lockd/xdr.c
*
* XDR support for lockd and the lock client.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/utsname.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>
#include <linux/lockd/sm_inter.h>
#define NLMDBG_FACILITY NLMDBG_XDR
static inline loff_t
s32_to_loff_t(__s32 offset)
{
return (loff_t)offset;
}
static inline __s32
loff_t_to_s32(loff_t offset)
{
__s32 res;
if (offset >= NLM_OFFSET_MAX)
res = NLM_OFFSET_MAX;
else if (offset <= -NLM_OFFSET_MAX)
res = -NLM_OFFSET_MAX;
else
res = offset;
return res;
}
/*
* XDR functions for basic NLM types
*/
static __be32 *nlm_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 inline __be32 *
nlm_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 *
nlm_decode_fh(__be32 *p, struct nfs_fh *f)
{
unsigned int len;
if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
dprintk("lockd: bad fhandle size %d (should be %d)\n",
len, NFS2_FHSIZE);
return NULL;
}
f->size = NFS2_FHSIZE;
memset(f->data, 0, sizeof(f->data));
memcpy(f->data, p, NFS2_FHSIZE);
return p + XDR_QUADLEN(NFS2_FHSIZE);
}
static inline __be32 *
nlm_encode_fh(__be32 *p, struct nfs_fh *f)
{
*p++ = htonl(NFS2_FHSIZE);
memcpy(p, f->data, NFS2_FHSIZE);
return p + XDR_QUADLEN(NFS2_FHSIZE);
}
/*
* Encode and decode owner handle
*/
static inline __be32 *
nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
{
return xdr_decode_netobj(p, oh);
}
static inline __be32 *
nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
{
return xdr_encode_netobj(p, oh);
}
static __be32 *
nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
{
struct file_lock *fl = &lock->fl;
s32 start, len, end;
if (!(p = xdr_decode_string_inplace(p, &lock->caller,
&lock->len,
NLM_MAXSTRLEN))
|| !(p = nlm_decode_fh(p, &lock->fh))
|| !(p = nlm_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 */
start = ntohl(*p++);
len = ntohl(*p++);
end = start + len - 1;
fl->fl_start = s32_to_loff_t(start);
if (len == 0 || end < 0)
fl->fl_end = OFFSET_MAX;
else
fl->fl_end = s32_to_loff_t(end);
return p;
}
/*
* Encode a lock as part of an NLM call
*/
static __be32 *
nlm_encode_lock(__be32 *p, struct nlm_lock *lock)
{
struct file_lock *fl = &lock->fl;
__s32 start, len;
if (!(p = xdr_encode_string(p, lock->caller))
|| !(p = nlm_encode_fh(p, &lock->fh))
|| !(p = nlm_encode_oh(p, &lock->oh)))
return NULL;
if (fl->fl_start > NLM_OFFSET_MAX
|| (fl->fl_end > NLM_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
return NULL;
start = loff_t_to_s32(fl->fl_start);
if (fl->fl_end == OFFSET_MAX)
len = 0;
else
len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
*p++ = htonl(lock->svid);
*p++ = htonl(start);
*p++ = htonl(len);
return p;
}
/*
* Encode result of a TEST/TEST_MSG call
*/
static __be32 *
nlm_encode_testres(__be32 *p, struct nlm_res *resp)
{
s32 start, len;
if (!(p = nlm_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_s32(fl->fl_start);
if (fl->fl_end == OFFSET_MAX)
len = 0;
else
len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
*p++ = htonl(start);
*p++ = htonl(len);
}
return p;
}
/*
* First, the server side XDR functions
*/
int
nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
u32 exclusive;
if (!(p = nlm_decode_cookie(p, &argp->cookie)))
return 0;
exclusive = ntohl(*p++);
if (!(p = nlm_decode_lock(p, &argp->lock)))
return 0;
if (exclusive)
argp->lock.fl.fl_type = F_WRLCK;
return xdr_argsize_check(rqstp, p);
}
int
nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
if (!(p = nlm_encode_testres(p, resp)))
return 0;
return xdr_ressize_check(rqstp, p);
}
int
nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
u32 exclusive;
if (!(p = nlm_decode_cookie(p, &argp->cookie)))
return 0;
argp->block = ntohl(*p++);
exclusive = ntohl(*p++);
if (!(p = nlm_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
nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
u32 exclusive;
if (!(p = nlm_decode_cookie(p, &argp->cookie)))
return 0;
argp->block = ntohl(*p++);
exclusive = ntohl(*p++);
if (!(p = nlm_decode_lock(p, &argp->lock)))
return 0;
if (exclusive)
argp->lock.fl.fl_type = F_WRLCK;
return xdr_argsize_check(rqstp, p);
}
int
nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
if (!(p = nlm_decode_cookie(p, &argp->cookie))
|| !(p = nlm_decode_lock(p, &argp->lock)))
return 0;
argp->lock.fl.fl_type = F_UNLCK;
return xdr_argsize_check(rqstp, p);
}
int
nlmsvc_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 = nlm_decode_cookie(p, &argp->cookie))
|| !(p = xdr_decode_string_inplace(p, &lock->caller,
&lock->len, NLM_MAXSTRLEN))
|| !(p = nlm_decode_fh(p, &lock->fh))
|| !(p = nlm_decode_oh(p, &lock->oh)))
return 0;
argp->fsm_mode = ntohl(*p++);
argp->fsm_access = ntohl(*p++);
return xdr_argsize_check(rqstp, p);
}
int
nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
if (!(p = nlm_encode_cookie(p, &resp->cookie)))
return 0;
*p++ = resp->status;
*p++ = xdr_zero; /* sequence argument */
return xdr_ressize_check(rqstp, p);
}
int
nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
if (!(p = nlm_encode_cookie(p, &resp->cookie)))
return 0;
*p++ = resp->status;
return xdr_ressize_check(rqstp, p);
}
int
nlmsvc_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
nlmsvc_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++);
/* Preserve the address in network byte order */
argp->addr = *p++;
return xdr_argsize_check(rqstp, p);
}
int
nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
if (!(p = nlm_decode_cookie(p, &resp->cookie)))
return 0;
resp->status = *p++;
return xdr_argsize_check(rqstp, p);
}
int
nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
return xdr_argsize_check(rqstp, p);
}
int
nlmsvc_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
nlmclt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
{
return 0;
}
#endif
static int
nlmclt_encode_testargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
{
struct nlm_lock *lock = &argp->lock;
if (!(p = nlm_encode_cookie(p, &argp->cookie)))
return -EIO;
*p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
if (!(p = nlm_encode_lock(p, lock)))
return -EIO;
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
static int
nlmclt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
{
if (!(p = nlm_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;
s32 start, len, 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 = nlm_decode_oh(p, &resp->lock.oh)))
return -EIO;
fl->fl_flags = FL_POSIX;
fl->fl_type = excl? F_WRLCK : F_RDLCK;
start = ntohl(*p++);
len = ntohl(*p++);
end = start + len - 1;
fl->fl_start = s32_to_loff_t(start);
if (len == 0 || end < 0)
fl->fl_end = OFFSET_MAX;
else
fl->fl_end = s32_to_loff_t(end);
}
return 0;
}
static int
nlmclt_encode_lockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
{
struct nlm_lock *lock = &argp->lock;
if (!(p = nlm_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 = nlm_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
nlmclt_encode_cancargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
{
struct nlm_lock *lock = &argp->lock;
if (!(p = nlm_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 = nlm_encode_lock(p, lock)))
return -EIO;
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
static int
nlmclt_encode_unlockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
{
struct nlm_lock *lock = &argp->lock;
if (!(p = nlm_encode_cookie(p, &argp->cookie)))
return -EIO;
if (!(p = nlm_encode_lock(p, lock)))
return -EIO;
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
static int
nlmclt_encode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
{
if (!(p = nlm_encode_cookie(p, &resp->cookie)))
return -EIO;
*p++ = resp->status;
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
static int
nlmclt_encode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
{
if (!(p = nlm_encode_testres(p, resp)))
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];
unsigned int i, 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