[linux-2.6-block.git] / net / sunrpc / svc.c

/*
 * linux/net/sunrpc/svc.c
 *
 * High-level RPC service routines
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/linkage.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/mm.h>

#include <linux/sunrpc/types.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/clnt.h>

#define RPCDBG_FACILITY	RPCDBG_SVCDSP
#define RPC_PARANOIA 1

/*
 * Create an RPC service
 */
struct svc_serv *
svc_create(struct svc_program *prog, unsigned int bufsize)
{
	struct svc_serv	*serv;
	int vers;
	unsigned int xdrsize;

	if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
		return NULL;
	serv->sv_name      = prog->pg_name;
	serv->sv_program   = prog;
	serv->sv_nrthreads = 1;
	serv->sv_stats     = prog->pg_stats;
	serv->sv_bufsz	   = bufsize? bufsize : 4096;
	xdrsize = 0;
	while (prog) {
		prog->pg_lovers = prog->pg_nvers-1;
		for (vers=0; vers<prog->pg_nvers ; vers++)
			if (prog->pg_vers[vers]) {
				prog->pg_hivers = vers;
				if (prog->pg_lovers > vers)
					prog->pg_lovers = vers;
				if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
					xdrsize = prog->pg_vers[vers]->vs_xdrsize;
			}
		prog = prog->pg_next;
	}
	serv->sv_xdrsize   = xdrsize;
	INIT_LIST_HEAD(&serv->sv_threads);
	INIT_LIST_HEAD(&serv->sv_sockets);
	INIT_LIST_HEAD(&serv->sv_tempsocks);
	INIT_LIST_HEAD(&serv->sv_permsocks);
	spin_lock_init(&serv->sv_lock);

	/* Remove any stale portmap registrations */
	svc_register(serv, 0, 0);

	return serv;
}

/*
 * Destroy an RPC service
 */
void
svc_destroy(struct svc_serv *serv)
{
	struct svc_sock	*svsk;

	dprintk("RPC: svc_destroy(%s, %d)\n",
				serv->sv_program->pg_name,
				serv->sv_nrthreads);

	if (serv->sv_nrthreads) {
		if (--(serv->sv_nrthreads) != 0) {
			svc_sock_update_bufs(serv);
			return;
		}
	} else
		printk("svc_destroy: no threads for serv=%p!\n", serv);

	while (!list_empty(&serv->sv_tempsocks)) {
		svsk = list_entry(serv->sv_tempsocks.next,
				  struct svc_sock,
				  sk_list);
		svc_delete_socket(svsk);
	}
	while (!list_empty(&serv->sv_permsocks)) {
		svsk = list_entry(serv->sv_permsocks.next,
				  struct svc_sock,
				  sk_list);
		svc_delete_socket(svsk);
	}
	
	cache_clean_deferred(serv);

	/* Unregister service with the portmapper */
	svc_register(serv, 0, 0);
	kfree(serv);
}

/*
 * Allocate an RPC server's buffer space.
 * We allocate pages and place them in rq_argpages.
 */
static int
svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
{
	int pages;
	int arghi;
	
	if (size > RPCSVC_MAXPAYLOAD)
		size = RPCSVC_MAXPAYLOAD;
	pages = 2 + (size+ PAGE_SIZE -1) / PAGE_SIZE;
	rqstp->rq_argused = 0;
	rqstp->rq_resused = 0;
	arghi = 0;
	BUG_ON(pages > RPCSVC_MAXPAGES);
	while (pages) {
		struct page *p = alloc_page(GFP_KERNEL);
		if (!p)
			break;
		rqstp->rq_argpages[arghi++] = p;
		pages--;
	}
	rqstp->rq_arghi = arghi;
	return ! pages;
}

/*
 * Release an RPC server buffer
 */
static void
svc_release_buffer(struct svc_rqst *rqstp)
{
	while (rqstp->rq_arghi)
		put_page(rqstp->rq_argpages[--rqstp->rq_arghi]);
	while (rqstp->rq_resused) {
		if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
			continue;
		put_page(rqstp->rq_respages[rqstp->rq_resused]);
	}
	rqstp->rq_argused = 0;
}

/*
 * Create a server thread
 */
int
svc_create_thread(svc_thread_fn func, struct svc_serv *serv)
{
	struct svc_rqst	*rqstp;
	int		error = -ENOMEM;

	rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
	if (!rqstp)
		goto out;

	init_waitqueue_head(&rqstp->rq_wait);

	if (!(rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
	 || !(rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
	 || !svc_init_buffer(rqstp, serv->sv_bufsz))
		goto out_thread;

	serv->sv_nrthreads++;
	rqstp->rq_server = serv;
	error = kernel_thread((int (*)(void *)) func, rqstp, 0);
	if (error < 0)
		goto out_thread;
	svc_sock_update_bufs(serv);
	error = 0;
out:
	return error;

out_thread:
	svc_exit_thread(rqstp);
	goto out;
}

/*
 * Destroy an RPC server thread
 */
void
svc_exit_thread(struct svc_rqst *rqstp)
{
	struct svc_serv	*serv = rqstp->rq_server;

	svc_release_buffer(rqstp);
	kfree(rqstp->rq_resp);
	kfree(rqstp->rq_argp);
	kfree(rqstp->rq_auth_data);
	kfree(rqstp);

	/* Release the server */
	if (serv)
		svc_destroy(serv);
}

/*
 * Register an RPC service with the local portmapper.
 * To unregister a service, call this routine with 
 * proto and port == 0.
 */
int
svc_register(struct svc_serv *serv, int proto, unsigned short port)
{
	struct svc_program	*progp;
	unsigned long		flags;
	int			i, error = 0, dummy;

	progp = serv->sv_program;

	dprintk("RPC: svc_register(%s, %s, %d)\n",
		progp->pg_name, proto == IPPROTO_UDP? "udp" : "tcp", port);

	if (!port)
		clear_thread_flag(TIF_SIGPENDING);

	for (i = 0; i < progp->pg_nvers; i++) {
		if (progp->pg_vers[i] == NULL)
			continue;
		error = rpc_register(progp->pg_prog, i, proto, port, &dummy);
		if (error < 0)
			break;
		if (port && !dummy) {
			error = -EACCES;
			break;
		}
	}

	if (!port) {
		spin_lock_irqsave(&current->sighand->siglock, flags);
		recalc_sigpending();
		spin_unlock_irqrestore(&current->sighand->siglock, flags);
	}

	return error;
}

/*
 * Process the RPC request.
 */
int
svc_process(struct svc_serv *serv, struct svc_rqst *rqstp)
{
	struct svc_program	*progp;
	struct svc_version	*versp = NULL;	/* compiler food */
	struct svc_procedure	*procp = NULL;
	struct kvec *		argv = &rqstp->rq_arg.head[0];
	struct kvec *		resv = &rqstp->rq_res.head[0];
	kxdrproc_t		xdr;
	__be32			*statp;
	u32			dir, prog, vers, proc;
	__be32			auth_stat, rpc_stat;
	int			auth_res;
	__be32			*accept_statp;

	rpc_stat = rpc_success;

	if (argv->iov_len < 6*4)
		goto err_short_len;

	/* setup response xdr_buf.
	 * Initially it has just one page 
	 */
	svc_take_page(rqstp); /* must succeed */
	resv->iov_base = page_address(rqstp->rq_respages[0]);
	resv->iov_len = 0;
	rqstp->rq_res.pages = rqstp->rq_respages+1;
	rqstp->rq_res.len = 0;
	rqstp->rq_res.page_base = 0;
	rqstp->rq_res.page_len = 0;
	rqstp->rq_res.buflen = PAGE_SIZE;
	rqstp->rq_res.tail[0].iov_base = NULL;
	rqstp->rq_res.tail[0].iov_len = 0;
	/* Will be turned off only in gss privacy case: */
	rqstp->rq_sendfile_ok = 1;
	/* tcp needs a space for the record length... */
	if (rqstp->rq_prot == IPPROTO_TCP)
		svc_putnl(resv, 0);

	rqstp->rq_xid = svc_getu32(argv);
	svc_putu32(resv, rqstp->rq_xid);

	dir  = svc_getnl(argv);
	vers = svc_getnl(argv);

	/* First words of reply: */
	svc_putnl(resv, 1);		/* REPLY */

	if (dir != 0)		/* direction != CALL */
		goto err_bad_dir;
	if (vers != 2)		/* RPC version number */
		goto err_bad_rpc;

	/* Save position in case we later decide to reject: */
	accept_statp = resv->iov_base + resv->iov_len;

	svc_putnl(resv, 0);		/* ACCEPT */

	rqstp->rq_prog = prog = svc_getnl(argv);	/* program number */
	rqstp->rq_vers = vers = svc_getnl(argv);	/* version number */
	rqstp->rq_proc = proc = svc_getnl(argv);	/* procedure number */

	progp = serv->sv_program;

	for (progp = serv->sv_program; progp; progp = progp->pg_next)
		if (prog == progp->pg_prog)
			break;

	/*
	 * Decode auth data, and add verifier to reply buffer.
	 * We do this before anything else in order to get a decent
	 * auth verifier.
	 */
	auth_res = svc_authenticate(rqstp, &auth_stat);
	/* Also give the program a chance to reject this call: */
	if (auth_res == SVC_OK && progp) {
		auth_stat = rpc_autherr_badcred;
		auth_res = progp->pg_authenticate(rqstp);
	}
	switch (auth_res) {
	case SVC_OK:
		break;
	case SVC_GARBAGE:
		rpc_stat = rpc_garbage_args;
		goto err_bad;
	case SVC_SYSERR:
		rpc_stat = rpc_system_err;
		goto err_bad;
	case SVC_DENIED:
		goto err_bad_auth;
	case SVC_DROP:
		goto dropit;
	case SVC_COMPLETE:
		goto sendit;
	}

	if (progp == NULL)
		goto err_bad_prog;

	if (vers >= progp->pg_nvers ||
	  !(versp = progp->pg_vers[vers]))
		goto err_bad_vers;

	procp = versp->vs_proc + proc;
	if (proc >= versp->vs_nproc || !procp->pc_func)
		goto err_bad_proc;
	rqstp->rq_server   = serv;
	rqstp->rq_procinfo = procp;

	/* Syntactic check complete */
	serv->sv_stats->rpccnt++;

	/* Build the reply header. */
	statp = resv->iov_base +resv->iov_len;
	svc_putnl(resv, RPC_SUCCESS);

	/* Bump per-procedure stats counter */
	procp->pc_count++;

	/* Initialize storage for argp and resp */
	memset(rqstp->rq_argp, 0, procp->pc_argsize);
	memset(rqstp->rq_resp, 0, procp->pc_ressize);

	/* un-reserve some of the out-queue now that we have a 
	 * better idea of reply size
	 */
	if (procp->pc_xdrressize)
		svc_reserve(rqstp, procp->pc_xdrressize<<2);

	/* Call the function that processes the request. */
	if (!versp->vs_dispatch) {
		/* Decode arguments */
		xdr = procp->pc_decode;
		if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
			goto err_garbage;

		*statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);

		/* Encode reply */
		if (*statp == rpc_success && (xdr = procp->pc_encode)
		 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
			dprintk("svc: failed to encode reply\n");
			/* serv->sv_stats->rpcsystemerr++; */
			*statp = rpc_system_err;
		}
	} else {
		dprintk("svc: calling dispatcher\n");
		if (!versp->vs_dispatch(rqstp, statp)) {
			/* Release reply info */
			if (procp->pc_release)
				procp->pc_release(rqstp, NULL, rqstp->rq_resp);
			goto dropit;
		}
	}

	/* Check RPC status result */
	if (*statp != rpc_success)
		resv->iov_len = ((void*)statp)  - resv->iov_base + 4;

	/* Release reply info */
	if (procp->pc_release)
		procp->pc_release(rqstp, NULL, rqstp->rq_resp);

	if (procp->pc_encode == NULL)
		goto dropit;

 sendit:
	if (svc_authorise(rqstp))
		goto dropit;
	return svc_send(rqstp);

 dropit:
	svc_authorise(rqstp);	/* doesn't hurt to call this twice */
	dprintk("svc: svc_process dropit\n");
	svc_drop(rqstp);
	return 0;

err_short_len:
#ifdef RPC_PARANOIA
	printk("svc: short len %Zd, dropping request\n", argv->iov_len);
#endif
	goto dropit;			/* drop request */

err_bad_dir:
#ifdef RPC_PARANOIA
	printk("svc: bad direction %d, dropping request\n", dir);
#endif
	serv->sv_stats->rpcbadfmt++;
	goto dropit;			/* drop request */

err_bad_rpc:
	serv->sv_stats->rpcbadfmt++;
	svc_putnl(resv, 1);	/* REJECT */
	svc_putnl(resv, 0);	/* RPC_MISMATCH */
	svc_putnl(resv, 2);	/* Only RPCv2 supported */
	svc_putnl(resv, 2);
	goto sendit;

err_bad_auth:
	dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
	serv->sv_stats->rpcbadauth++;
	/* Restore write pointer to location of accept status: */
	xdr_ressize_check(rqstp, accept_statp);
	svc_putnl(resv, 1);	/* REJECT */
	svc_putnl(resv, 1);	/* AUTH_ERROR */
	svc_putnl(resv, ntohl(auth_stat));	/* status */
	goto sendit;

err_bad_prog:
	dprintk("svc: unknown program %d\n", prog);
	serv->sv_stats->rpcbadfmt++;
	svc_putnl(resv, RPC_PROG_UNAVAIL);
	goto sendit;

err_bad_vers:
#ifdef RPC_PARANOIA
	printk("svc: unknown version (%d)\n", vers);
#endif
	serv->sv_stats->rpcbadfmt++;
	svc_putnl(resv, RPC_PROG_MISMATCH);
	svc_putnl(resv, progp->pg_lovers);
	svc_putnl(resv, progp->pg_hivers);
	goto sendit;

err_bad_proc:
#ifdef RPC_PARANOIA
	printk("svc: unknown procedure (%d)\n", proc);
#endif
	serv->sv_stats->rpcbadfmt++;
	svc_putnl(resv, RPC_PROC_UNAVAIL);
	goto sendit;

err_garbage:
#ifdef RPC_PARANOIA
	printk("svc: failed to decode args\n");
#endif
	rpc_stat = rpc_garbage_args;
err_bad:
	serv->sv_stats->rpcbadfmt++;
	svc_putnl(resv, ntohl(rpc_stat));
	goto sendit;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/net/sunrpc/svc.c
	3	*
	4	* High-level RPC service routines
	5	*
	6	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
	9	#include <linux/linkage.h>
	10	#include <linux/sched.h>
	11	#include <linux/errno.h>
	12	#include <linux/net.h>
	13	#include <linux/in.h>
	14	#include <linux/mm.h>
	15
	16	#include <linux/sunrpc/types.h>
	17	#include <linux/sunrpc/xdr.h>
	18	#include <linux/sunrpc/stats.h>
	19	#include <linux/sunrpc/svcsock.h>
	20	#include <linux/sunrpc/clnt.h>
	21
	22	#define RPCDBG_FACILITY RPCDBG_SVCDSP
	23	#define RPC_PARANOIA 1
	24
	25	/*
	26	* Create an RPC service
	27	*/
	28	struct svc_serv *
	29	svc_create(struct svc_program *prog, unsigned int bufsize)
	30	{
	31	struct svc_serv *serv;
	32	int vers;
	33	unsigned int xdrsize;
	34
0da974f4	35	if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
1da177e4	36	return NULL;
9ba02638	37	serv->sv_name = prog->pg_name;
1da177e4 LT	38	serv->sv_program = prog;
	39	serv->sv_nrthreads = 1;
	40	serv->sv_stats = prog->pg_stats;
	41	serv->sv_bufsz = bufsize? bufsize : 4096;
1da177e4	42	xdrsize = 0;
9ba02638 AG	43	while (prog) {
	44	prog->pg_lovers = prog->pg_nvers-1;
	45	for (vers=0; vers<prog->pg_nvers ; vers++)
	46	if (prog->pg_vers[vers]) {
	47	prog->pg_hivers = vers;
	48	if (prog->pg_lovers > vers)
	49	prog->pg_lovers = vers;
	50	if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
	51	xdrsize = prog->pg_vers[vers]->vs_xdrsize;
	52	}
	53	prog = prog->pg_next;
	54	}
1da177e4 LT	55	serv->sv_xdrsize = xdrsize;
	56	INIT_LIST_HEAD(&serv->sv_threads);
	57	INIT_LIST_HEAD(&serv->sv_sockets);
	58	INIT_LIST_HEAD(&serv->sv_tempsocks);
	59	INIT_LIST_HEAD(&serv->sv_permsocks);
	60	spin_lock_init(&serv->sv_lock);
	61
1da177e4 LT	62	/* Remove any stale portmap registrations */
	63	svc_register(serv, 0, 0);
	64
	65	return serv;
	66	}
	67
	68	/*
	69	* Destroy an RPC service
	70	*/
	71	void
	72	svc_destroy(struct svc_serv *serv)
	73	{
	74	struct svc_sock *svsk;
	75
	76	dprintk("RPC: svc_destroy(%s, %d)\n",
	77	serv->sv_program->pg_name,
	78	serv->sv_nrthreads);
	79
	80	if (serv->sv_nrthreads) {
	81	if (--(serv->sv_nrthreads) != 0) {
	82	svc_sock_update_bufs(serv);
	83	return;
	84	}
	85	} else
	86	printk("svc_destroy: no threads for serv=%p!\n", serv);
	87
	88	while (!list_empty(&serv->sv_tempsocks)) {
	89	svsk = list_entry(serv->sv_tempsocks.next,
	90	struct svc_sock,
	91	sk_list);
	92	svc_delete_socket(svsk);
	93	}
	94	while (!list_empty(&serv->sv_permsocks)) {
	95	svsk = list_entry(serv->sv_permsocks.next,
	96	struct svc_sock,
	97	sk_list);
	98	svc_delete_socket(svsk);
	99	}
	100
	101	cache_clean_deferred(serv);
	102
	103	/* Unregister service with the portmapper */
	104	svc_register(serv, 0, 0);
	105	kfree(serv);
	106	}
	107
	108	/*
	109	* Allocate an RPC server's buffer space.
	110	* We allocate pages and place them in rq_argpages.
	111	*/
	112	static int
	113	svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
	114	{
	115	int pages;
	116	int arghi;
	117
	118	if (size > RPCSVC_MAXPAYLOAD)
	119	size = RPCSVC_MAXPAYLOAD;
	120	pages = 2 + (size+ PAGE_SIZE -1) / PAGE_SIZE;
	121	rqstp->rq_argused = 0;
	122	rqstp->rq_resused = 0;
	123	arghi = 0;
09a62660	124	BUG_ON(pages > RPCSVC_MAXPAGES);
1da177e4 LT	125	while (pages) {
	126	struct page *p = alloc_page(GFP_KERNEL);
	127	if (!p)
	128	break;
	129	rqstp->rq_argpages[arghi++] = p;
	130	pages--;
	131	}
	132	rqstp->rq_arghi = arghi;
	133	return ! pages;
	134	}
	135
	136	/*
	137	* Release an RPC server buffer
	138	*/
	139	static void
	140	svc_release_buffer(struct svc_rqst *rqstp)
	141	{
	142	while (rqstp->rq_arghi)
	143	put_page(rqstp->rq_argpages[--rqstp->rq_arghi]);
	144	while (rqstp->rq_resused) {
	145	if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
	146	continue;
	147	put_page(rqstp->rq_respages[rqstp->rq_resused]);
	148	}
	149	rqstp->rq_argused = 0;
	150	}
	151
	152	/*
	153	* Create a server thread
	154	*/
	155	int
	156	svc_create_thread(svc_thread_fn func, struct svc_serv *serv)
	157	{
	158	struct svc_rqst *rqstp;
	159	int error = -ENOMEM;
	160
0da974f4	161	rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
1da177e4 LT	162	if (!rqstp)
	163	goto out;
	164
1da177e4 LT	165	init_waitqueue_head(&rqstp->rq_wait);
1da177e4 LT	166
12fe2c58 JJ	167	if (!(rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
12fe2c58 JJ	168	\|\| !(rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
1da177e4 LT	169	\|\| !svc_init_buffer(rqstp, serv->sv_bufsz))
	170	goto out_thread;
	171
	172	serv->sv_nrthreads++;
	173	rqstp->rq_server = serv;
	174	error = kernel_thread((int ()(void )) func, rqstp, 0);
	175	if (error < 0)
	176	goto out_thread;
	177	svc_sock_update_bufs(serv);
	178	error = 0;
	179	out:
	180	return error;
	181
	182	out_thread:
	183	svc_exit_thread(rqstp);
	184	goto out;
	185	}
	186
	187	/*
	188	* Destroy an RPC server thread
	189	*/
	190	void
	191	svc_exit_thread(struct svc_rqst *rqstp)
	192	{
	193	struct svc_serv *serv = rqstp->rq_server;
	194
	195	svc_release_buffer(rqstp);
a51482bd JJ	196	kfree(rqstp->rq_resp);
	197	kfree(rqstp->rq_argp);
	198	kfree(rqstp->rq_auth_data);
1da177e4 LT	199	kfree(rqstp);
	200
	201	/* Release the server */
	202	if (serv)
	203	svc_destroy(serv);
	204	}
	205
	206	/*
	207	* Register an RPC service with the local portmapper.
	208	* To unregister a service, call this routine with
	209	* proto and port == 0.
	210	*/
	211	int
	212	svc_register(struct svc_serv *serv, int proto, unsigned short port)
	213	{
	214	struct svc_program *progp;
	215	unsigned long flags;
	216	int i, error = 0, dummy;
	217
	218	progp = serv->sv_program;
	219
	220	dprintk("RPC: svc_register(%s, %s, %d)\n",
	221	progp->pg_name, proto == IPPROTO_UDP? "udp" : "tcp", port);
	222
	223	if (!port)
	224	clear_thread_flag(TIF_SIGPENDING);
	225
	226	for (i = 0; i < progp->pg_nvers; i++) {
	227	if (progp->pg_vers[i] == NULL)
	228	continue;
	229	error = rpc_register(progp->pg_prog, i, proto, port, &dummy);
	230	if (error < 0)
	231	break;
	232	if (port && !dummy) {
	233	error = -EACCES;
	234	break;
	235	}
	236	}
	237
	238	if (!port) {
	239	spin_lock_irqsave(&current->sighand->siglock, flags);
	240	recalc_sigpending();
	241	spin_unlock_irqrestore(&current->sighand->siglock, flags);
	242	}
	243
	244	return error;
	245	}
	246
	247	/*
	248	* Process the RPC request.
	249	*/
	250	int
	251	svc_process(struct svc_serv serv, struct svc_rqst rqstp)
	252	{
	253	struct svc_program *progp;
	254	struct svc_version versp = NULL; / compiler food */
	255	struct svc_procedure *procp = NULL;
	256	struct kvec * argv = &rqstp->rq_arg.head[0];
	257	struct kvec * resv = &rqstp->rq_res.head[0];
	258	kxdrproc_t xdr;
d8ed029d AD	259	__be32 *statp;
	260	u32 dir, prog, vers, proc;
	261	__be32 auth_stat, rpc_stat;
1da177e4	262	int auth_res;
d8ed029d	263	__be32 *accept_statp;
1da177e4 LT	264
	265	rpc_stat = rpc_success;
	266
	267	if (argv->iov_len < 6*4)
	268	goto err_short_len;
	269
	270	/* setup response xdr_buf.
	271	* Initially it has just one page
	272	*/
	273	svc_take_page(rqstp); /* must succeed */
	274	resv->iov_base = page_address(rqstp->rq_respages[0]);
	275	resv->iov_len = 0;
	276	rqstp->rq_res.pages = rqstp->rq_respages+1;
	277	rqstp->rq_res.len = 0;
	278	rqstp->rq_res.page_base = 0;
	279	rqstp->rq_res.page_len = 0;
334ccfd5	280	rqstp->rq_res.buflen = PAGE_SIZE;
7c9fdcfb	281	rqstp->rq_res.tail[0].iov_base = NULL;
1da177e4	282	rqstp->rq_res.tail[0].iov_len = 0;
5c04c46a BF	283	/* Will be turned off only in gss privacy case: */
5c04c46a BF	284	rqstp->rq_sendfile_ok = 1;
1da177e4 LT	285	/* tcp needs a space for the record length... */
1da177e4 LT	286	if (rqstp->rq_prot == IPPROTO_TCP)
76994313	287	svc_putnl(resv, 0);
1da177e4 LT	288
	289	rqstp->rq_xid = svc_getu32(argv);
	290	svc_putu32(resv, rqstp->rq_xid);
	291
76994313 AD	292	dir = svc_getnl(argv);
76994313 AD	293	vers = svc_getnl(argv);
1da177e4 LT	294
1da177e4 LT	295	/* First words of reply: */
76994313	296	svc_putnl(resv, 1); /* REPLY */
1da177e4 LT	297
	298	if (dir != 0) /* direction != CALL */
	299	goto err_bad_dir;
	300	if (vers != 2) /* RPC version number */
	301	goto err_bad_rpc;
	302
	303	/* Save position in case we later decide to reject: */
	304	accept_statp = resv->iov_base + resv->iov_len;
	305
76994313	306	svc_putnl(resv, 0); /* ACCEPT */
1da177e4	307
76994313 AD	308	rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
	309	rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
	310	rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
1da177e4 LT	311
1da177e4 LT	312	progp = serv->sv_program;
80d188a6 N	313
	314	for (progp = serv->sv_program; progp; progp = progp->pg_next)
	315	if (prog == progp->pg_prog)
	316	break;
	317
1da177e4 LT	318	/*
	319	* Decode auth data, and add verifier to reply buffer.
	320	* We do this before anything else in order to get a decent
	321	* auth verifier.
	322	*/
	323	auth_res = svc_authenticate(rqstp, &auth_stat);
	324	/* Also give the program a chance to reject this call: */
80d188a6	325	if (auth_res == SVC_OK && progp) {
1da177e4 LT	326	auth_stat = rpc_autherr_badcred;
	327	auth_res = progp->pg_authenticate(rqstp);
	328	}
	329	switch (auth_res) {
	330	case SVC_OK:
	331	break;
	332	case SVC_GARBAGE:
	333	rpc_stat = rpc_garbage_args;
	334	goto err_bad;
	335	case SVC_SYSERR:
	336	rpc_stat = rpc_system_err;
	337	goto err_bad;
	338	case SVC_DENIED:
	339	goto err_bad_auth;
	340	case SVC_DROP:
	341	goto dropit;
	342	case SVC_COMPLETE:
	343	goto sendit;
	344	}
80d188a6	345
9ba02638	346	if (progp == NULL)
1da177e4 LT	347	goto err_bad_prog;
	348
	349	if (vers >= progp->pg_nvers \|\|
	350	!(versp = progp->pg_vers[vers]))
	351	goto err_bad_vers;
	352
	353	procp = versp->vs_proc + proc;
	354	if (proc >= versp->vs_nproc \|\| !procp->pc_func)
	355	goto err_bad_proc;
	356	rqstp->rq_server = serv;
	357	rqstp->rq_procinfo = procp;
	358
	359	/* Syntactic check complete */
	360	serv->sv_stats->rpccnt++;
	361
	362	/* Build the reply header. */
	363	statp = resv->iov_base +resv->iov_len;
76994313	364	svc_putnl(resv, RPC_SUCCESS);
1da177e4 LT	365
	366	/* Bump per-procedure stats counter */
	367	procp->pc_count++;
	368
	369	/* Initialize storage for argp and resp */
	370	memset(rqstp->rq_argp, 0, procp->pc_argsize);
	371	memset(rqstp->rq_resp, 0, procp->pc_ressize);
	372
	373	/* un-reserve some of the out-queue now that we have a
	374	* better idea of reply size
	375	*/
	376	if (procp->pc_xdrressize)
	377	svc_reserve(rqstp, procp->pc_xdrressize<<2);
	378
	379	/* Call the function that processes the request. */
	380	if (!versp->vs_dispatch) {
	381	/* Decode arguments */
	382	xdr = procp->pc_decode;
	383	if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
	384	goto err_garbage;
	385
	386	*statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
	387
	388	/* Encode reply */
	389	if (*statp == rpc_success && (xdr = procp->pc_encode)
	390	&& !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
	391	dprintk("svc: failed to encode reply\n");
	392	/* serv->sv_stats->rpcsystemerr++; */
	393	*statp = rpc_system_err;
	394	}
	395	} else {
	396	dprintk("svc: calling dispatcher\n");
	397	if (!versp->vs_dispatch(rqstp, statp)) {
	398	/* Release reply info */
	399	if (procp->pc_release)
	400	procp->pc_release(rqstp, NULL, rqstp->rq_resp);
	401	goto dropit;
	402	}
	403	}
	404
	405	/* Check RPC status result */
	406	if (*statp != rpc_success)
	407	resv->iov_len = ((void*)statp) - resv->iov_base + 4;
	408
	409	/* Release reply info */
	410	if (procp->pc_release)
	411	procp->pc_release(rqstp, NULL, rqstp->rq_resp);
	412
	413	if (procp->pc_encode == NULL)
	414	goto dropit;
	415
	416	sendit:
	417	if (svc_authorise(rqstp))
	418	goto dropit;
	419	return svc_send(rqstp);
	420
	421	dropit:
	422	svc_authorise(rqstp); /* doesn't hurt to call this twice */
	423	dprintk("svc: svc_process dropit\n");
	424	svc_drop(rqstp);
	425	return 0;
	426
	427	err_short_len:
	428	#ifdef RPC_PARANOIA
429	printk("svc: short len %Zd, dropping request\n", argv->iov_len);
430	#endif
431	goto dropit; /* drop request */
432
433	err_bad_dir:
434	#ifdef RPC_PARANOIA
435	printk("svc: bad direction %d, dropping request\n", dir);
436	#endif
437	serv->sv_stats->rpcbadfmt++;
438	goto dropit; /* drop request */
439
440	err_bad_rpc:
441	serv->sv_stats->rpcbadfmt++;
76994313 AD	442	svc_putnl(resv, 1); /* REJECT */
	443	svc_putnl(resv, 0); /* RPC_MISMATCH */
	444	svc_putnl(resv, 2); /* Only RPCv2 supported */
	445	svc_putnl(resv, 2);
1da177e4 LT	446	goto sendit;
	447
	448	err_bad_auth:
	449	dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
	450	serv->sv_stats->rpcbadauth++;
	451	/* Restore write pointer to location of accept status: */
	452	xdr_ressize_check(rqstp, accept_statp);
76994313 AD	453	svc_putnl(resv, 1); /* REJECT */
	454	svc_putnl(resv, 1); /* AUTH_ERROR */
	455	svc_putnl(resv, ntohl(auth_stat)); /* status */
1da177e4 LT	456	goto sendit;
	457
	458	err_bad_prog:
9ba02638	459	dprintk("svc: unknown program %d\n", prog);
1da177e4	460	serv->sv_stats->rpcbadfmt++;
76994313	461	svc_putnl(resv, RPC_PROG_UNAVAIL);
1da177e4 LT	462	goto sendit;
	463
	464	err_bad_vers:
	465	#ifdef RPC_PARANOIA
	466	printk("svc: unknown version (%d)\n", vers);
	467	#endif
	468	serv->sv_stats->rpcbadfmt++;
76994313 AD	469	svc_putnl(resv, RPC_PROG_MISMATCH);
	470	svc_putnl(resv, progp->pg_lovers);
	471	svc_putnl(resv, progp->pg_hivers);
1da177e4 LT	472	goto sendit;
	473
	474	err_bad_proc:
	475	#ifdef RPC_PARANOIA
	476	printk("svc: unknown procedure (%d)\n", proc);
	477	#endif
	478	serv->sv_stats->rpcbadfmt++;
76994313	479	svc_putnl(resv, RPC_PROC_UNAVAIL);
1da177e4 LT	480	goto sendit;
	481
	482	err_garbage:
	483	#ifdef RPC_PARANOIA
	484	printk("svc: failed to decode args\n");
	485	#endif
	486	rpc_stat = rpc_garbage_args;
	487	err_bad:
	488	serv->sv_stats->rpcbadfmt++;
76994313	489	svc_putnl(resv, ntohl(rpc_stat));
1da177e4 LT	490	goto sendit;
1da177e4 LT	491	}