590 lines
		
	
	
		
			14 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			590 lines
		
	
	
		
			14 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
/*
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 * linux/fs/lockd/xdr4.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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 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
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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/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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#define NLMDBG_FACILITY		NLMDBG_XDR
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static inline loff_t
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s64_to_loff_t(__s64 offset)
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{
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	return (loff_t)offset;
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}
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static inline s64
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loff_t_to_s64(loff_t offset)
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{
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	s64 res;
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	if (offset > NLM4_OFFSET_MAX)
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		res = NLM4_OFFSET_MAX;
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	else if (offset < -NLM4_OFFSET_MAX)
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		res = -NLM4_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 *
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nlm4_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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		dprintk("lockd: bad cookie size %d (only cookies under "
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			"%d bytes are supported.)\n",
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				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 __be32 *
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nlm4_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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nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
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{
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	memset(f->data, 0, sizeof(f->data));
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	f->size = ntohl(*p++);
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	if (f->size > NFS_MAXFHSIZE) {
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		dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
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			f->size, NFS_MAXFHSIZE);
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		return NULL;
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	}
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      	memcpy(f->data, p, f->size);
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	return p + XDR_QUADLEN(f->size);
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}
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static __be32 *
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nlm4_encode_fh(__be32 *p, struct nfs_fh *f)
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{
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	*p++ = htonl(f->size);
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	if (f->size) p[XDR_QUADLEN(f->size)-1] = 0; /* don't leak anything */
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	memcpy(p, f->data, f->size);
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	return p + XDR_QUADLEN(f->size);
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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 __be32 *
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nlm4_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 __be32 *
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nlm4_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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nlm4_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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	__u64			len, start;
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	__s64			end;
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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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	 || !(p = nlm4_decode_fh(p, &lock->fh))
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	 || !(p = nlm4_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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	p = xdr_decode_hyper(p, &start);
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	p = xdr_decode_hyper(p, &len);
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	end = start + len - 1;
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	fl->fl_start = s64_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 = s64_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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nlm4_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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	__s64			start, len;
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	if (!(p = xdr_encode_string(p, lock->caller))
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	 || !(p = nlm4_encode_fh(p, &lock->fh))
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	 || !(p = nlm4_encode_oh(p, &lock->oh)))
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		return NULL;
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	if (fl->fl_start > NLM4_OFFSET_MAX
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	 || (fl->fl_end > NLM4_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
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		return NULL;
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	*p++ = htonl(lock->svid);
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	start = loff_t_to_s64(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_s64(fl->fl_end - fl->fl_start + 1);
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	p = xdr_encode_hyper(p, start);
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	p = xdr_encode_hyper(p, 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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nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
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{
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	s64		start, len;
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	dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
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	if (!(p = nlm4_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_s64(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_s64(fl->fl_end - fl->fl_start + 1);
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		p = xdr_encode_hyper(p, start);
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		p = xdr_encode_hyper(p, len);
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		dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
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			resp->status, (int)resp->lock.svid, fl->fl_type,
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			(long long)fl->fl_start,  (long long)fl->fl_end);
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	}
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	dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
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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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nlm4svc_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 = nlm4_decode_cookie(p, &argp->cookie)))
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		return 0;
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	exclusive = ntohl(*p++);
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	if (!(p = nlm4_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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nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
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{
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	if (!(p = nlm4_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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nlm4svc_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 = nlm4_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 = nlm4_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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nlm4svc_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 = nlm4_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 = nlm4_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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nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
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{
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	if (!(p = nlm4_decode_cookie(p, &argp->cookie))
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	 || !(p = nlm4_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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nlm4svc_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 = nlm4_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 = nlm4_decode_fh(p, &lock->fh))
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	 || !(p = nlm4_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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nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
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{
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	if (!(p = nlm4_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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nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
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{
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	if (!(p = nlm4_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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nlm4svc_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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nlm4svc_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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	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
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	p += XDR_QUADLEN(SM_PRIV_SIZE);
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	return xdr_argsize_check(rqstp, p);
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}
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int
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nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
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{
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	if (!(p = nlm4_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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nlm4svc_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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nlm4svc_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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nlm4clt_decode_void(struct rpc_rqst *req, __be32 *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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nlm4clt_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 = nlm4_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 = nlm4_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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nlm4clt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
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{
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	if (!(p = nlm4_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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		__u64			start, len;
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		__s64			end;
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		memset(&resp->lock, 0, sizeof(resp->lock));
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		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,
 | 
						|
};
 |