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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2017 RackTop Systems.
*/
#include <sys/systm.h>
#include <sys/sdt.h>
#include <rpc/types.h>
#include <rpc/auth.h>
#include <rpc/auth_unix.h>
#include <rpc/auth_des.h>
#include <rpc/svc.h>
#include <rpc/xdr.h>
#include <nfs/nfs4.h>
#include <nfs/nfs_dispatch.h>
#include <sys/cmn_err.h>
#include <sys/modctl.h>
static void
rfs4_err_resp(COMPOUND4args *args, COMPOUND4res *resp, nfsstat4 err)
{
size_t sz;
resp->array_len = 1;
sz = resp->array_len * sizeof (nfs_resop4);
resp->array = kmem_zalloc(sz, KM_SLEEP);
resp->array[0].resop = args->array[0].argop;
resp->status = resp->array[0].nfs_resop4_u.opillegal.status = err;
}
/*
* The function checks if given compound operation is allowed
* to be the very fist operation in compound array.
*/
static bool_t
valid_first_compound_op(nfs_opnum4 op)
{
if (op == OP_BIND_CONN_TO_SESSION ||
op == OP_SEQUENCE ||
op == OP_EXCHANGE_ID ||
op == OP_CREATE_SESSION ||
op == OP_DESTROY_SESSION ||
op == OP_DESTROY_CLIENTID ||
op == OP_ILLEGAL)
return (TRUE);
return (FALSE);
}
/*
* The function verifies arguments passed to mds_op_compound.
* If agrguments are valid, NFS4_OK is returned, otherwise
* function returns correspoinding NFS4 error code.
*/
static nfsstat4
verify_compound_args(COMPOUND4args *args)
{
if (args->array_len == 0)
return (NFS4_OK);
if (!valid_first_compound_op(args->array[0].argop))
return (NFS4ERR_OP_NOT_IN_SESSION);
if (args->array_len > 1 && args->array[0].argop != OP_SEQUENCE) {
/*
* Compound is outside the session. There must be
* only one operation in request.
*/
return (NFS4ERR_NOT_ONLY_OP);
}
return (NFS4_OK);
}
static void
rfs4x_dispatch_done(compound_state_t *cs)
{
if (cs->slot)
rfs4x_sequence_done(cs->cmpresp, cs);
else {
rfs4_compound_free(cs->cmpresp);
}
cs->cs_flags |= RFS4_DISPATCH_DONE;
}
static bool_t
xdr_compound_wrapper(XDR *xdrs, compound_state_t *cs)
{
COMPOUND4res *resp = cs->cmpresp;
bool_t res = FALSE;
bool_t isreal = (xdrs->x_handy != 0); /* real data encoding ? */
if (!(cs->cs_flags & RFS4_DISPATCH_DONE)) {
res = xdr_COMPOUND4res_srv(xdrs, resp);
if (isreal)
rfs4x_dispatch_done(cs);
}
return (res);
}
int
rfs4x_dispatch(struct svc_req *req, SVCXPRT *xprt, char *ap)
{
struct compound_state cs;
COMPOUND4res res_buf;
COMPOUND4res *rbp;
COMPOUND4args *cap;
int rpcerr = 0;
nfsstat4 error;
bzero(&res_buf, sizeof (COMPOUND4res));
rbp = &res_buf;
cap = (COMPOUND4args *)ap;
rfs4_init_compound_state(&cs);
cs.statusp = &error;
cs.cmpresp = rbp;
error = verify_compound_args(cap);
if (error != NFS4_OK) { /* NFS4_OK is 0 */
rfs4_err_resp(cap, rbp, error);
goto out_send;
}
error = rfs4x_sequence_prep(cap, rbp, &cs);
if (error != NFS4_OK) {
if (error != nfserr_replay_cache)
rfs4_err_resp(cap, rbp, error);
goto out_send;
}
/* Regular processing */
curthread->t_flag |= T_DONTPEND;
rfs4_compound(cap, rbp, &cs, req, &rpcerr);
curthread->t_flag &= ~T_DONTPEND;
/*
* On RPC error, short sendreply
*/
if (rpcerr) {
goto out_free;
}
if (curthread->t_flag & T_WOULDBLOCK) {
curthread->t_flag &= ~T_WOULDBLOCK;
error = 1;
goto out_free;
}
out_send:
if (!svc_sendreply(xprt, xdr_compound_wrapper, (char *)&cs)) {
DTRACE_PROBE2(sendfail, SVCXPRT *, xprt,
compound_state_t *, &cs);
svcerr_systemerr(xprt);
rpcerr = 1;
}
out_free:
if (!(cs.cs_flags & RFS4_DISPATCH_DONE)) {
rfs4x_dispatch_done(&cs);
}
rfs4_fini_compound_state(&cs);
return ((error != NFS4_OK || rpcerr) ? 1 : 0);
}
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