Commit 8e5b6773 authored by Trond Myklebust's avatar Trond Myklebust Committed by J. Bruce Fields
Browse files

SUNRPC: Add a callback to initialise server requests 



Add a callback to help initialise server requests before they are
processed. This will allow us to clean up the NFS server version
support, and to make it container safe.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 83dd59a0

fs/lockd/svc.c

+2 −1
Original line number Diff line number Diff line
@@ -807,5 +807,6 @@ static struct svc_program nlmsvc_program = { 
	.pg_name		= "lockd",		/* service name */

	.pg_class		= "nfsd",		/* share authentication with nfsd */

	.pg_stats		= &nlmsvc_stats,	/* stats table */

	.pg_authenticate = &lockd_authenticate	/* export authentication */

	.pg_authenticate	= &lockd_authenticate,	/* export authentication */

	.pg_init_request	= svc_generic_init_request,

};

fs/nfs/callback.c

+1 −0
Original line number Diff line number Diff line
@@ -457,4 +457,5 @@ static struct svc_program nfs4_callback_program = { 
	.pg_class = "nfs",				/* authentication class */

	.pg_stats = &nfs4_callback_stats,

	.pg_authenticate = nfs_callback_authenticate,

	.pg_init_request = svc_generic_init_request,

};

fs/nfsd/nfssvc.c

+2 −0
Original line number Diff line number Diff line
@@ -86,6 +86,7 @@ static struct svc_program nfsd_acl_program = { 
	.pg_class		= "nfsd",

	.pg_stats		= &nfsd_acl_svcstats,

	.pg_authenticate	= &svc_set_client,

	.pg_init_request	= svc_generic_init_request,

};



static struct svc_stat	nfsd_acl_svcstats = {
@@ -118,6 +119,7 @@ struct svc_program nfsd_program = { 
	.pg_class		= "nfsd",		/* authentication class */

	.pg_stats		= &nfsd_svcstats,	/* version table */

	.pg_authenticate	= &svc_set_client,	/* export authentication */

	.pg_init_request	= svc_generic_init_request,



};

include/linux/sunrpc/svc.h

+16 −0
Original line number Diff line number Diff line
@@ -383,6 +383,16 @@ struct svc_deferred_req { 
	__be32			args[0];

};



struct svc_process_info {

	union {

		int  (*dispatch)(struct svc_rqst *, __be32 *);

		struct {

			unsigned int lovers;

			unsigned int hivers;

		} mismatch;

	};

};



/*

 * List of RPC programs on the same transport endpoint

 */
@@ -397,6 +407,9 @@ struct svc_program { 
	char *			pg_class;	/* class name: services sharing authentication */

	struct svc_stat *	pg_stats;	/* rpc statistics */

	int			(*pg_authenticate)(struct svc_rqst *);

	__be32			(*pg_init_request)(struct svc_rqst *,

						   const struct svc_program *,

						   struct svc_process_info *);

};



/*
@@ -506,6 +519,9 @@ char *svc_fill_symlink_pathname(struct svc_rqst *rqstp, 
					     struct kvec *first, void *p,

					     size_t total);

__be32		   svc_return_autherr(struct svc_rqst *rqstp, __be32 auth_err);

__be32		   svc_generic_init_request(struct svc_rqst *rqstp,

					    const struct svc_program *progp,

					    struct svc_process_info *procinfo);



#define	RPC_MAX_ADDRBUFLEN	(63U)

net/sunrpc/svc.c

+76 −37
Original line number Diff line number Diff line
@@ -1160,6 +1160,59 @@ svc_get_autherr(struct svc_rqst *rqstp, __be32 *statp) 
	return rpc_auth_ok;

}



__be32

svc_generic_init_request(struct svc_rqst *rqstp,

		const struct svc_program *progp,

		struct svc_process_info *ret)

{

	const struct svc_version *versp = NULL;	/* compiler food */

	const struct svc_procedure *procp = NULL;



	if (rqstp->rq_vers >= progp->pg_nvers )

		goto err_bad_vers;

	  versp = progp->pg_vers[rqstp->rq_vers];

	  if (!versp)

		goto err_bad_vers;



	/*

	 * Some protocol versions (namely NFSv4) require some form of

	 * congestion control.  (See RFC 7530 section 3.1 paragraph 2)

	 * In other words, UDP is not allowed. We mark those when setting

	 * up the svc_xprt, and verify that here.

	 *

	 * The spec is not very clear about what error should be returned

	 * when someone tries to access a server that is listening on UDP

	 * for lower versions. RPC_PROG_MISMATCH seems to be the closest

	 * fit.

	 */

	if (versp->vs_need_cong_ctrl && rqstp->rq_xprt &&

	    !test_bit(XPT_CONG_CTRL, &rqstp->rq_xprt->xpt_flags))

		goto err_bad_vers;



	if (rqstp->rq_proc >= versp->vs_nproc)

		goto err_bad_proc;

	rqstp->rq_procinfo = procp = &versp->vs_proc[rqstp->rq_proc];

	if (!procp)

		goto err_bad_proc;



	/* Initialize storage for argp and resp */

	memset(rqstp->rq_argp, 0, procp->pc_argsize);

	memset(rqstp->rq_resp, 0, procp->pc_ressize);



	/* Bump per-procedure stats counter */

	versp->vs_count[rqstp->rq_proc]++;



	ret->dispatch = versp->vs_dispatch;

	return rpc_success;

err_bad_vers:

	ret->mismatch.lovers = progp->pg_lovers;

	ret->mismatch.hivers = progp->pg_hivers;

	return rpc_prog_mismatch;

err_bad_proc:

	return rpc_proc_unavail;

}

EXPORT_SYMBOL_GPL(svc_generic_init_request);



/*

 * Common routine for processing the RPC request.

 */
@@ -1167,11 +1220,11 @@ static int 
svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)

{

	struct svc_program	*progp;

	const struct svc_version *versp = NULL;	/* compiler food */

	const struct svc_procedure *procp = NULL;

	struct svc_serv		*serv = rqstp->rq_server;

	struct svc_process_info process;

	__be32			*statp;

	u32			prog, vers, proc;

	u32			prog, vers;

	__be32			auth_stat, rpc_stat;

	int			auth_res;

	__be32			*reply_statp;
@@ -1203,8 +1256,8 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) 
	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 */

	rqstp->rq_vers = svc_getnl(argv);	/* version number */

	rqstp->rq_proc = svc_getnl(argv);	/* procedure number */



	for (progp = serv->sv_program; progp; progp = progp->pg_next)

		if (prog == progp->pg_prog)
@@ -1242,29 +1295,22 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) 
	if (progp == NULL)

		goto err_bad_prog;



	if (vers >= progp->pg_nvers ||

	  !(versp = progp->pg_vers[vers]))

		goto err_bad_vers;



	/*

	 * Some protocol versions (namely NFSv4) require some form of

	 * congestion control.  (See RFC 7530 section 3.1 paragraph 2)

	 * In other words, UDP is not allowed. We mark those when setting

	 * up the svc_xprt, and verify that here.

	 *

	 * The spec is not very clear about what error should be returned

	 * when someone tries to access a server that is listening on UDP

	 * for lower versions. RPC_PROG_MISMATCH seems to be the closest

	 * fit.

	 */

	if (versp->vs_need_cong_ctrl && rqstp->rq_xprt &&

	    !test_bit(XPT_CONG_CTRL, &rqstp->rq_xprt->xpt_flags))

	rpc_stat = progp->pg_init_request(rqstp, progp, &process);

	switch (rpc_stat) {

	case rpc_success:

		break;

	case rpc_prog_unavail:

		goto err_bad_prog;

	case rpc_prog_mismatch:

		goto err_bad_vers;

	case rpc_proc_unavail:

		goto err_bad_proc;

	}



	procp = versp->vs_proc + proc;

	if (proc >= versp->vs_nproc || !procp->pc_func)

	procp = rqstp->rq_procinfo;

	/* Should this check go into the dispatcher? */

	if (!procp || !procp->pc_func)

		goto err_bad_proc;

	rqstp->rq_procinfo = procp;



	/* Syntactic check complete */

	serv->sv_stats->rpccnt++;
@@ -1274,13 +1320,6 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) 
	statp = resv->iov_base +resv->iov_len;

	svc_putnl(resv, RPC_SUCCESS);



	/* Bump per-procedure stats counter */

	versp->vs_count[proc]++;



	/* 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

	 */
@@ -1288,7 +1327,7 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) 
		svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);



	/* Call the function that processes the request. */

	if (!versp->vs_dispatch) {

	if (!process.dispatch) {

		/*

		 * Decode arguments

		 * XXX: why do we ignore the return value?
@@ -1317,7 +1356,7 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) 
		}

	} else {

		dprintk("svc: calling dispatcher\n");

		if (!versp->vs_dispatch(rqstp, statp)) {

		if (!process.dispatch(rqstp, statp)) {

			/* Release reply info */

			if (procp->pc_release)

				procp->pc_release(rqstp);
@@ -1386,16 +1425,16 @@ err_bad_prog: 


err_bad_vers:

	svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",

		       vers, prog, progp->pg_name);

		       rqstp->rq_vers, rqstp->rq_prog, progp->pg_name);



	serv->sv_stats->rpcbadfmt++;

	svc_putnl(resv, RPC_PROG_MISMATCH);

	svc_putnl(resv, progp->pg_lovers);

	svc_putnl(resv, progp->pg_hivers);

	svc_putnl(resv, process.mismatch.lovers);

	svc_putnl(resv, process.mismatch.hivers);

	goto sendit;



err_bad_proc:

	svc_printk(rqstp, "unknown procedure (%d)\n", proc);

	svc_printk(rqstp, "unknown procedure (%d)\n", rqstp->rq_proc);



	serv->sv_stats->rpcbadfmt++;

	svc_putnl(resv, RPC_PROC_UNAVAIL);

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