PRIVATE void rpc__cn_call_executor
(pointer_t arg, boolean32 call_was_queued ATTRIBUTE_UNUSED)
{
rpc_binding_rep_t *binding_r;
rpc_cn_call_rep_t *call_r;
rpc_iovector_t iovector;
dce_uuid_t type_uuid;
rpc_mgr_epv_t manager_epv;
rpc_v2_server_stub_epv_t server_stub_epv;
rpc_if_rep_p_t if_spec_rep;
unsigned32 flags;
unsigned32 max_calls;
unsigned32 max_rpc_size;
rpc_if_callback_fn_t if_callback;
unsigned32 status;
RPC_LOG_CN_CTHD_NTR;
RPC_DBG_PRINTF (rpc_e_dbg_general, RPC_C_CN_DBG_GENERAL,
("CN: call_rep->%x call executor running ... %s queued\n", arg, (call_was_queued ? "WAS" : "WAS NOT")));
/*
* The arg passed in is really a call rep.
*/
call_r = (rpc_cn_call_rep_t *) arg;
/*
* Release the call rep lock which was acquired for us in the
* common code.
*/
RPC_CALL_UNLOCK ((rpc_call_rep_t *) call_r);
/*
* If there is an object uuid, see if there's a type uuid
* associated with it.
*/
rpc_object_inq_type (&call_r->binding_rep->obj, &type_uuid, &status);
if ((status != rpc_s_object_not_found) && (status != rpc_s_ok))
{
RPC_CALL_LOCK ((rpc_call_rep_t *) call_r);
rpc__cthread_cancel_caf ((rpc_call_rep_t *) call_r);
RPC_CALL_UNLOCK ((rpc_call_rep_t *) call_r);
RPC_CN_LOCK ();
rpc__cn_call_reject ((rpc_call_rep_p_t) call_r, status);
RPC_CN_UNLOCK ();
goto CLEANUP;
}
/*
* Get the if rep and the server stub and manager EPV.
*/
rpc__if_lookup2 (call_r->u.server.if_id,
call_r->u.server.if_vers,
&type_uuid,
&call_r->u.server.ihint,
&if_spec_rep,
&server_stub_epv,
&manager_epv,
&flags,
&max_calls,
&max_rpc_size,
&if_callback,
&status);
if (status != rpc_s_ok)
{
RPC_CALL_LOCK ((rpc_call_rep_t *) call_r);
rpc__cthread_cancel_caf ((rpc_call_rep_t *) call_r);
RPC_CALL_UNLOCK ((rpc_call_rep_t *) call_r);
RPC_CN_LOCK ();
rpc__cn_call_reject ((rpc_call_rep_p_t) call_r, status);
RPC_CN_UNLOCK ();
goto CLEANUP;
}
/*
* If the operation number is out of range, indicate a fault to
* the protocol service, otherwise process the incoming packet(s).
*/
if (call_r->opnum >= if_spec_rep->opcnt)
{
RPC_CALL_LOCK ((rpc_call_rep_t *) call_r);
rpc__cthread_cancel_caf ((rpc_call_rep_t *) call_r);
RPC_CALL_UNLOCK ((rpc_call_rep_t *) call_r);
RPC_CN_LOCK ();
rpc__cn_call_reject ((rpc_call_rep_p_t) call_r, rpc_s_op_rng_error);
RPC_CN_UNLOCK ();
goto CLEANUP;
}
/*
* Receive the first packet.
*/
rpc__cn_call_receive ((rpc_call_rep_t *) call_r,
&iovector.elt[0],
&status);
if (status != rpc_s_ok)
{
RPC_CALL_LOCK ((rpc_call_rep_t *) call_r);
rpc__cthread_cancel_caf ((rpc_call_rep_t *) call_r);
RPC_CALL_UNLOCK ((rpc_call_rep_t *) call_r);
RPC_CN_LOCK ();
rpc__cn_call_reject ((rpc_call_rep_p_t) call_r, rpc_s_op_rng_error);
RPC_CN_UNLOCK ();
goto CLEANUP;
}
/*
* Mark the call as having executed.
*/
call_r->call_executed = true;
/*
* Enable posting of cancels to this call executor thread.
* This will also post any queued cancels.
*/
RPC_DBG_PRINTF (rpc_e_dbg_cancel, RPC_C_CN_DBG_CANCEL,
("(rpc__cn_call_executor) call_rep->%x enabling posting of cancels and posting any queued cancels\n", call_r));
RPC_CALL_LOCK ((rpc_call_rep_t *) call_r);
rpc__cthread_cancel_enable_post ((rpc_call_rep_p_t) call_r);
RPC_CALL_UNLOCK ((rpc_call_rep_t *) call_r);
/*
* Dispatch appropriately depending on the stub version.
*/
switch (if_spec_rep->stub_rtl_if_vers)
{
/*
* If this is an old v0 or v1 stub runtime interface
* then do the dirty work out of line.
*/
case 0:
case 1:
/*
* rpc_m_pre_v2_ifspec
* "(%s) Pre-v2 interface spec"
*/
RPC_DCE_SVC_PRINTF ((
DCE_SVC(RPC__SVC_HANDLE, "%s"),
rpc_svc_server_call,
svc_c_sev_fatal | svc_c_action_abort,
rpc_m_pre_v2_ifspec,
"rpc__cn_call_executor" ));
break;
/*
* This is the v2 (new) stub runtime interface.
*/
case 2:
RPC_LOG_SERVER_STUB_PRE;
((*server_stub_epv[call_r->opnum]))
((handle_t) call_r->binding_rep,
(rpc_call_handle_t) call_r,
&iovector.elt[0],
&(RPC_CN_ASSOC_NDR_FORMAT (call_r->assoc)),
&call_r->transfer_syntax,
manager_epv,
&status);
RPC_LOG_SERVER_STUB_POST;
break;
/*
* Unknown version
*/
default:
/*
* rpc_m_unk_ifspec
* "(%s) Unknown interface spec version"
*/
RPC_DCE_SVC_PRINTF ((
DCE_SVC(RPC__SVC_HANDLE, "%s"),
rpc_svc_server_call,
svc_c_sev_fatal | svc_c_action_abort,
rpc_m_pre_v2_ifspec,
"rpc__cn_call_executor" ));
break;
}
/*
* Check for an error while in the server stub but before the
* manager routine was entered.
*/
if (status != rpc_s_ok)
{
RPC_CALL_LOCK ((rpc_call_rep_t *) call_r);
rpc__cthread_cancel_caf ((rpc_call_rep_t *) call_r);
RPC_CALL_UNLOCK ((rpc_call_rep_t *) call_r);
RPC_CN_LOCK ();
rpc__cn_call_reject ((rpc_call_rep_p_t) call_r, status);
RPC_CN_UNLOCK ();
goto CLEANUP;
}
/*
* If the stub returned successfully, end the call and free the binding handle.
*/
binding_r = (rpc_binding_rep_t *) call_r->binding_rep;
RPC_CALL_LOCK ((rpc_call_rep_t *) call_r);
rpc__cthread_cancel_caf ((rpc_call_rep_t *) call_r);
RPC_CALL_UNLOCK ((rpc_call_rep_t *) call_r);
CLEANUP:
binding_r = (rpc_binding_rep_t *) call_r->binding_rep;
rpc__cn_call_end ((rpc_call_rep_p_t *) &call_r, &status);
RPC_LOCK (0);
RPC_BINDING_RELEASE (&binding_r,
&status);
RPC_UNLOCK (0);
RPC_LOG_CN_CTHD_XIT;
}
PRIVATE void rpc__dg_execute_call
(
dce_pointer_t scall_,
boolean32 call_was_queued ATTRIBUTE_UNUSED
)
{
ndr_format_t drep;
unsigned32 st, reject_st;
boolean broadcast;
boolean idem = false;
boolean maybe;
boolean sent_response;
boolean called_stub;
rpc_dg_scall_p_t scall = (rpc_dg_scall_p_t) scall_;
rpc_dg_pkt_hdr_p_t hdrp;
rpc_iovector_elt_t iove;
rpc_dg_recvq_elt_p_t rqe;
unsigned16 ihint;
rpc_dg_binding_server_p_t h;
rpc_v2_server_stub_epv_t ss_epv;
rpc_mgr_epv_t mgr_epv;
rpc_if_rep_p_t ifspec;
idl_uuid_t type;
int force_way_auth;
rpc_key_info_p_t key_info;
rpc_dg_auth_epv_p_t auth_epv;
unsigned16 opnum;
unsigned32 flags;
unsigned32 max_calls;
unsigned32 max_rpc_size;
rpc_if_callback_fn_t if_callback;
int prev_cancel_state;
/*
* All of this code (99% of which is never executed) is in the fast path.
*
* NOTE: This routine is responsible for sending back a correct
* cancel pending status to the client under all conditions
* (to ensure that cancels don't get lost - i.e. forwarded to the
* server, accepted, not delivered and then not reported as
* a cancel pending).
*
* Any "reject response" to the client must be robust (at least for
* Non-Idempotent calls). This is necessary because the client may
* have already received a fack causing it to free some pkts that it
* would need to "rerun" the call (assuming the stub was never entered)
* in the event that a reject was lost.
*
* Client's recover from lost responses to idempotent calls (including
* proper cancel pending resetting) so we don't have to worry about
* being robust in this situation.
*/
/*
* The caller of this routine is responsible for handing off a
* call *reference* to us. We will release our reference when
* we're done.
*/
RPC_DG_CALL_LOCK_ASSERT(&scall->c);
/*
* We are now executing.
*/
scall->call_is_queued = false;
/*
* Initialize the iove, since in any failure case (i.e. orphan),
* it may not be updated correctly; subsequent logic depends on freeing
* things based on the proper state of the iove.
*/
iove.buff_dealloc = NULL;
/*
* Initialize the "called_stub" flag to false. If a call gets
* rejected, and never enters the stub routine, it's up to us to
* free the request RQE.
*/
called_stub = false;
/*
* Initialize the "sent call response" flag to indicate a failure.
* This is necessary so that failures resulting in END_OF_CALL
* end up transitioning to the proper call state when we wrap-up
* call processing (at the end of this routine).
*/
sent_response = false;
/*
* Before continuing, it's likely that the call has been "opened
* up" (due to a unlock/lock around call executor handoff) and we
* need to check if it is safe to continue...
*/
if (scall->c.state != rpc_e_dg_cs_recv)
goto END_OF_CALL;
/*
* If this call does not yet have a reservation, make one now. Any
* call that was queued will not have a reservation; also, even if
* a executor thread was initially available for the call, there
* might not have been any reservations available at that time.
* (Note that the call to make the reservation may block until a
* reservation becomes available.)
*
* The make_reservation routine requires that the global lock be
* held. To respect the locking heirarchy, we need to juggle the
* locks around a little, checking that the state of the call doesn't
* change during the times when it's unlocked.
*/
if (scall->c.n_resvs < scall->c.max_resvs)
{
RPC_DG_CALL_UNLOCK(&scall->c);
RPC_LOCK(0);
RPC_DG_CALL_LOCK(&scall->c);
if (scall->c.state != rpc_e_dg_cs_recv)
{
RPC_UNLOCK(0);
goto END_OF_CALL;
}
/*
* We always start with the maximum reservation because we no longer
* reset high_rcv_frag_size and snd_frag_size between the calls.
* (The previous call may have used/advertised the larger fragment
* size.)
*
* This is fine in the user space since the packet rationing will
* never happen. (We assume that there are always enough packet
* buffers available.)
*
* This may accelerate the packet rationing in the kernel, though
* (iff MBF is turned on). Unfortunately, we can't start with the
* minimum reservation in the kernel because the other end may be a
* user space.
*/
rpc__dg_pkt_adjust_reservation(&scall->c, scall->c.max_resvs, true);
RPC_UNLOCK(0);
/*
* Since the call's been opened up, we need to check its status.
*/
if (scall->c.state != rpc_e_dg_cs_recv)
{
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) Cancelled while awaiting pkt reservation\n"));
goto END_OF_CALL;
}
/*
* Since this call did not have a reservation, any data received for
* it was dropped, and the client was told not to send any more.
* Since the call can now receive data, prod the client into
* retransmitting.
*/
rpc__dg_call_xmit_fack(&scall->c, NULL, ! scall->c.rq.recving_frags);
}
/*
* Now's as good a time as any to enable direct cancel posting to
* the thread (while we've got the call lock held). It might have
* been nice to defer this to just before the sstub dispatch, but
* then we'd have to re-acquire the call lock.
*
* NOTE: This routine MUST call rpc_cthread_cancel_caf() before
* returning (regardless of the return path)! This requirement
* exists because cancels may be (become) pending at any time and
* must be flushed (otherwise subsequent calls using this thread
* will inherit this call's cancel).
*/
rpc__cthread_cancel_enable_post(&scall->c.c);
/*
* Create a server binding handle, if we don't already have one hanging
* off the scall. If we have a cached one, reinit it.
*/
if (scall->h != NULL)
{
h = scall->h;
RPC_DG_BINDING_SERVER_REINIT(h);
}
else
{
rpc_addr_p_t addr;
rpc__naf_addr_copy(scall->c.addr, &addr, &st);
h = (rpc_dg_binding_server_p_t) rpc__binding_alloc
(true, &scall->c.call_object, RPC_C_PROTOCOL_ID_NCADG, addr, &st);
if (st != rpc_s_ok)
{
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) Can't allocate binding, st = 0x%x\n", st));
goto END_OF_CALL;
}
RPC_DG_CALL_REFERENCE(&scall->c);
h->scall = scall;
if (!scall->c.is_cbk)
{
key_info = scall->scte->key_info;
if (key_info != NULL)
{
rpc_auth_info_p_t auth_info = key_info->auth_info;
h->c.c.auth_info = auth_info;
RPC_DG_AUTH_REFERENCE(auth_info); /* for the handle */
}
}
scall->h = h;
}
assert(RPC_DG_CALL_IS_SERVER(&scall->c));
/*
* Dequeue the first pkt off of the receive queue (including it's hdr).
*
* WARNING: we MUST use comm_receive_int() because comm_receive(),
* while it would do the locking for us, doesn't return a useable iove
* for 0 length data.
*
* We're supposed to be in the init state until we know we're accepting
* the call (that means after a WAY callback if one is necessary).
* Make certain this is the case following the receive.
*
* WARNING 2: Note that this call verifies the authenticity of the
* packet it reads *except* in two cases:
*
* - When the packet is from a call on an activity the server doesn't
* currently know about (in which case we notice later on that the
* authn_proto field in the header is non-zero).
*
* - When the authentication check fails with a status code of
* "rpc_s_dg_need_way_auth". Note that in this event, the
* "receive_int" is still viewed as having succeeded, albeit with
* a non-zero status code.
*
* In either of these cases, a way_auth callback is made, and,
* if it is successful, the authenticity check is retried
* (further down in this function).
*/
rpc__dg_call_receive_int(&scall->c, &iove, &st);
force_way_auth = false;
if (st == rpc_s_dg_need_way_auth) {
RPC_DBG_PRINTF(rpc_e_dbg_general, 4,
("(rpc__dg_execute_call) will force way callback\n"));
st = rpc_s_ok;
/*
* We don't own the rqe. It's still on recvq.
*/
force_way_auth = true;
}
else if (st != rpc_s_ok)
{
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) Receive failed st = 0x%x\n", st));
goto END_OF_CALL;
}
rqe = RPC_DG_RECVQ_ELT_FROM_IOVECTOR_ELT(&iove);
assert(rqe != NULL && rqe->hdrp != NULL);
hdrp = rqe->hdrp;
idem = ((hdrp->flags & RPC_C_DG_PF_IDEMPOTENT) != 0);
broadcast = ((hdrp->flags & RPC_C_DG_PF_BROADCAST) != 0);
maybe = ((hdrp->flags & RPC_C_DG_PF_MAYBE) != 0);
if (scall->c.is_cbk)
{
RPC_DBG_PRINTF(rpc_e_dbg_general, 3,
("(rpc__dg_execute_call) Callback [%s]\n",
rpc__dg_act_seq_string(hdrp)));
}
/*
* Perform some of the request pkt verification that was defered.
* This includes interface id and operation number.
*/
if (!scall->c.is_cbk)
key_info = scall->scte->key_info;
else
key_info = NULL;
/*
* Does the request specify authentication, do we not have auth info
* yet, is the call not "maybe", and is this not a callback (!!!
* for the callback case)? If so, then get the auth info now.
*/
if (hdrp->auth_proto != 0 &&
key_info == NULL &&
! maybe &&
! scall->c.is_cbk)
{
rpc_authn_protocol_id_t authn_protocol;
rpc_auth_info_p_t auth_info;
assert(scall->c.key_info == NULL);
/*
* Get the appropiate DG auth EPV. We need to convert the wire
* auth protocol ID into the corresponding API value and then
* get the EPV using that latter value.
*/
authn_protocol = rpc__auth_cvt_id_wire_to_api(hdrp->auth_proto, &st);
if (st != rpc_s_ok)
{
reject_st = rpc_s_unknown_reject;
goto AFTER_CALL_TO_STUB;
}
auth_epv = (rpc_dg_auth_epv_p_t)
rpc__auth_rpc_prot_epv
(authn_protocol, RPC_C_PROTOCOL_ID_NCADG);
if (auth_epv == NULL)
{
reject_st = rpc_s_unknown_reject;
goto AFTER_CALL_TO_STUB;
}
/*
* Call into auth service to create an auth info.
*
* This generates an auth_info and a key_info. The auth_info
* gets attached to the handle, while the key_info gets
* attached to the scte and scall.
*/
key_info = (*auth_epv->create) (&st);
if (st != rpc_s_ok)
{
reject_st = rpc_s_unknown_reject;
goto AFTER_CALL_TO_STUB;
}
scall->c.key_info = key_info;
scall->c.auth_epv = auth_epv;
/* we have one reference to the key_info already. */
scall->scte->key_info = key_info;
scall->scte->auth_epv = auth_epv;
RPC_DG_KEY_REFERENCE(key_info); /* for the scte */
/* fill in the auth_info in the handle */
auth_info = key_info->auth_info;
h->c.c.auth_info = auth_info;
RPC_DG_AUTH_REFERENCE(auth_info); /* for the handle */
}
auth_epv = scall->c.auth_epv;
/*
* If the interface isn't valid, send a rejection.
*/
rpc_object_inq_type(&scall->c.call_object, &type, &st);
if (! (st == rpc_s_ok || st == rpc_s_object_not_found))
{
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) rpc_object_inq_type failed, st=0x%x [%s]\n",
st, rpc__dg_act_seq_string(hdrp)));
reject_st = st;
goto AFTER_CALL_TO_STUB;
}
ihint = hdrp->ihint;
rpc__if_lookup2 (&hdrp->if_id, hdrp->if_vers, &type,
&ihint, &ifspec, &ss_epv, &mgr_epv,
&flags, &max_calls, &max_rpc_size,
&if_callback, &st);
if (st != rpc_s_ok)
{
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) rpc__if_lookup failed, st=0x%x [%s]\n",
st, rpc__dg_act_seq_string(hdrp)));
reject_st = st;
goto AFTER_CALL_TO_STUB;
}
/*
* The interface is valid, update the call ihint so we tell the client.
*/
scall->c.call_ihint = ihint;
/*
* Extract a copy of the opnum from the packet header, and check to see that
* it's appropriate for this interface.
*/
opnum = hdrp->opnum;
if (opnum >= ifspec->opcnt)
{
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) Opnum (%u) out of range [%s]\n",
opnum, rpc__dg_act_seq_string(hdrp)));
reject_st = rpc_s_op_rng_error;
goto AFTER_CALL_TO_STUB;
}
/*
* To guarantee at-most-once semantics for non-idempotent RPCs, we
* must ensure that the call is filtered based on a WAY validated
* sequence number. If we don't have such a sequence number, then
* call back to client to get one (the returned WAY validated seq
* must match this RPC's seq - i.e. it must be the RPC that the client
* is currently performing). Note that we may do a way_auth
* callback even when we wouldn't otherwise do it because the
* underlying authentication layers decided one was needed.
*
* The analogous processing for non-idempotent callbacks (from a
* server manager to the client originating the call, who needs to
* validate the callback's seq) was previously taken care of in the
* do_request() processing (a WAY validated logical scte high_seq
* was already known).
*
* Note also that maybe calls with large-INs are tagged as
* non-idempotent but do not need to be protected against re-runs.
* (The architecture specifies that maybe calls can *not* have
* at-most-once semantics, but the implementation finds it more
* convenient to use the non-idempotent code paths for handling
* calls with large-INs.) For this reason, avoid doing a WAY for
* maybe calls (the client may not even be still running!).
*
* Release and reacquire the call lock while performing this
* (slow path / lengthy) WAY and Auth processing.
*
* We perform the WAY RPC with general cancel delivery disabled.
* The RPC prologue is suppose to be transparent and clients can
* orphan the call if they get tired of waiting around.
*/
if (! maybe &&
(force_way_auth || key_info != NULL ||
(! idem && ! scall->c.is_cbk)))
{
if (!force_way_auth && RPC_DG_SCT_IS_WAY_VALIDATED(scall->scte))
{
/*
* We want to make this check because it's better to be safe
* than sorry regarding at-most-once semantics. It's
* conceivable that the connection became WAY validated *after*
* this call had passed it's initial filtering (if nothing
* else, it should protect us from other potential coding
* errors :-)
*/
if (scall->c.call_seq != scall->scte->high_seq)
{
RPC_DBG_PRINTF(rpc_e_dbg_general, 2,
("(execute_call) Old sequence, previous=%u [%s]\n",
scall->scte->high_seq, rpc__dg_act_seq_string(hdrp)));
goto END_OF_CALL;
}
}
else
{
boolean high_seq_was_way_validated =
(boolean)(scall->scte->high_seq_is_way_validated);
/*
* WAY validate the connection and ensure that this call
* is the current call. Unlock the scall while performing the
* WAY validation.
*/
rpc_dg_sct_elt_p_t scte;
RPC_DG_CALL_UNLOCK(&scall->c);
/*
* The WAY validation routine must be called with the connection
* unlocked. Due to locking hierarchy and the fact that we
* unlocked the scall, we've opened up a window... check if
* it's safe to continue.
*/
RPC_LOCK(0);
RPC_DG_CALL_LOCK(&scall->c);
if (scall->c.state != rpc_e_dg_cs_recv)
{
RPC_UNLOCK(0);
goto END_OF_CALL;
}
scte = scall->scte;
RPC_DG_CALL_UNLOCK(&scall->c);
rpc__dg_sct_way_validate(scte, force_way_auth, &st);
RPC_UNLOCK(0);
RPC_DG_CALL_LOCK(&scall->c);
/*
* Before continuing, we've "opened up" the call (due to
* the unlock/lock) and we need to check if it is safe to
* continue...
*/
if (scall->c.state != rpc_e_dg_cs_recv)
goto END_OF_CALL;
if (st != rpc_s_ok)
{
reject_st = rpc_s_who_are_you_failed;
goto AFTER_CALL_TO_STUB;
}
else
{
if (scall->c.call_seq != scall->scte->high_seq)
{
RPC_DBG_PRINTF(rpc_e_dbg_general, 2,
("(rpc__dg_execute_call) Old sequence, previous=%u [%s]\n",
scall->scte->high_seq, rpc__dg_act_seq_string(hdrp)));
goto END_OF_CALL;
}
}
/*
* If high_seq_was_way_validated, rpc__dg_call_receive_int()
* has already verified the packet by calling
* (*auth_epv->recv_ck)().
* It's ok to call it again here except when using
* pkt_privacy where the packet body is already decrypted.
* For consistency, we don't verify the packet if it's
* already done.
*/
if (key_info != NULL && !force_way_auth
&& !high_seq_was_way_validated)
{
unsigned32 blocksize = auth_epv->blocksize;
char *cksum;
int raw_bodysize;
/*
* This must be a single buffer fragment.
* The very first fragment!
*/
if (rqe->hdrp == NULL || rqe->frag_len != rqe->pkt_len)
{
reject_st = rpc_s_who_are_you_failed;
goto AFTER_CALL_TO_STUB;
}
/*
* It's not really necessary to round up the packet body
* length here because the sender includes the length of
* padding before the auth trailer in the packet body length.
* However, I think, that's a wrong behavior and we shouldn't
* rely on it.
*/
raw_bodysize = ((rqe->hdrp->len + blocksize - 1)
/ blocksize) * blocksize;
/*
* Now that we have obtained authentication
* credentials, go back and verify that cksum is
* entirely contained inside the packet, and the
* auth_type is what we expected. This "shouldn't
* fail" unless someone's playing games with us.
*/
if (((RPC_C_DG_RAW_PKT_HDR_SIZE + raw_bodysize +
auth_epv->overhead) > rqe->frag_len) ||
(rqe->hdrp->auth_proto != auth_epv->auth_proto))
{
st = nca_s_proto_error;
}
else
{
/*
* Adjust the packet buffer's pkt_len,
* i.e., excluding the auth trailer.
* Also adjust data_len in the iovector.
*/
rqe->pkt_len = raw_bodysize + RPC_C_DG_RAW_PKT_HDR_SIZE;
iove.data_len = raw_bodysize;
cksum = rqe->pkt->body.args + raw_bodysize;
RPC_DBG_PRINTF(rpc_e_dbg_general, 4,
("(rpc__dg_execute_call) calling recv_ck now\n"));
(*auth_epv->recv_ck) (key_info, rqe, cksum, &st);
}
if (st != rpc_s_ok)
{
RPC_DBG_PRINTF(rpc_e_dbg_general, 2,
("(rpc__dg_execute_call) pkt didn't verify -- %x\n", st));
reject_st = rpc_s_who_are_you_failed;
goto AFTER_CALL_TO_STUB;
}
}
else if (key_info != NULL && force_way_auth)
{
/*
* Call rpc__dg_call_receive_int() again. This time,
* (*auth_epv->recv_ck)() is supposed to succeed.
*/
rpc__dg_call_receive_int(&scall->c, &iove, &st);
force_way_auth = false;
if (st == rpc_s_dg_need_way_auth) {
/*
* We still don't own the rqe...
*/
force_way_auth = true;
}
if (st != rpc_s_ok)
{
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) Receive failed st = 0x%x after forced WAY auth callback\n", st));
reject_st = rpc_s_who_are_you_failed;
goto AFTER_CALL_TO_STUB;
}
assert(rqe == RPC_DG_RECVQ_ELT_FROM_IOVECTOR_ELT(&iove));
}
}
}
assert(force_way_auth == false);
/*
* If we get here, we're accepting the call and we're gonna dispatch
* to the server stub! Setup the required args for the dispatch
* (the iove was done above) and run call the server stub.
*/
RPC_DG_HDR_INQ_DREP(&drep, hdrp);
/*
* The packet rationing code needs to know that we no longer need
* to worry about doing WAYs.
*/
scall->c.rq.is_way_validated = true;
/*
* Unlock the call lock while in the stub.
*/
RPC_DG_CALL_UNLOCK(&scall->c);
/*
* Note: the stubs are absolutely, positively required to free the
* provided iove described buffer (assuming the len > 0), even if
* the stub detects and returns an error condition. Set the
* "called_stub" flag to true so that we know we don't have to worry
* about freeing the RQE ourselves.
*/
called_stub = true;
/*
* As required by the packet rationing rules, if the I/O vector element
* has no data, free it up now because the server stub doesn't bother
* to free such elements. Note that we needed the element until
* now for the info that was in its packet header.
*/
if (iove.data_len == 0 && iove.buff_dealloc != NULL)
RPC_FREE_IOVE_BUFFER(&iove);
switch (ifspec->stub_rtl_if_vers)
{
/*
* If this is an old v0 or v1 stub runtime interface. Do the
* dirty work out of line.
*/
case RPC_C_STUB_RTL_IF_VERS_NCS_1_0:
case RPC_C_STUB_RTL_IF_VERS_NCS_1_5:
if (rpc_g_dg_pre_v2_server_call_p == NULL)
{
/*
* rpc_m_pre_v2_ss
* "(%s) Can't handle pre-v2 server stubs"
*/
rpc_dce_svc_printf (
__FILE__, __LINE__,
"%s",
rpc_svc_server_call,
svc_c_sev_fatal | svc_c_action_abort,
rpc_m_pre_v2_ss,
"rpc__dg_execute_call" );
}
prev_cancel_state = dcethread_enableinterrupt_throw(0);
(*rpc_g_dg_pre_v2_server_call_p)(
ifspec,
opnum,
(handle_t) h,
(rpc_call_handle_t) scall,
&iove,
drep,
ss_epv,
mgr_epv,
&reject_st);
dcethread_enableinterrupt_throw(prev_cancel_state);
break;
/*
* This is the v2 (new) stub runtime interface.
*/
case RPC_C_STUB_RTL_IF_VERS_DCE_1_0:
prev_cancel_state = dcethread_enableinterrupt_throw(0);
(*(ss_epv[opnum]))(
(handle_t) h,
(rpc_call_handle_t) scall,
&iove,
&drep,
&ndr_g_transfer_syntax,
mgr_epv,
&reject_st);
dcethread_enableinterrupt_throw(prev_cancel_state);
break;
/*
* Unknown version
*/
default:
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) Unknown rtl/if version. 0x%x\n",
ifspec->stub_rtl_if_vers));
RPC_DG_CALL_LOCK(&scall->c);
if (iove.buff_dealloc != NULL)
RPC_FREE_IOVE_BUFFER(&iove);
goto END_OF_CALL;
}
/*
* While the stub may have returned due to call orphaning, this will
* not typically be the case. Even if it completed succesfully
* we could become orphaned further down in this processing (e.g.
* in xmitq_push). Defer orphan checking and cleanup till we only
* have to do it once; the extra work done if we are orphaned won't
* kill us.
*/
/*
* Acquire the call lock since we need it for several pieces of
* processing from here on in.
*
* Before continuing, we've "opened up" the call (due to the
* unlock/lock) and we need to check if it is safe to continue...
*/
RPC_DG_CALL_LOCK(&scall->c);
if (scall->c.state != rpc_e_dg_cs_recv
&& scall->c.state != rpc_e_dg_cs_xmit)
{
goto END_OF_CALL;
}
/*
* Error cases detected before we get to calling the stub and that want
* to send a "reject" re-enter here.
*/
AFTER_CALL_TO_STUB:
RPC_DG_CALL_LOCK_ASSERT(&scall->c);
/*
* If this was a broadcast request and we're either rejecting the call
* or the call faulted, just skip to the end.
*/
if (broadcast &&
(reject_st != rpc_s_ok ||
RPC_DG_HDR_INQ_PTYPE(&scall->c.xq.hdr) == RPC_C_DG_PT_FAULT))
{
goto END_OF_CALL;
}
/*
* The stub was obligated to call the iove's dealloc routine,
* so we don't have to free that. We don't need the recvq anymore.
* In normal cases, the list will already be empty, so having this
* in the fast path doesn't hurt and (in the error cases) it frees
* up resources while we potentially wait in xmitq_push() (or
* awaiting a xqe for a reject or no [outs] response).
*/
if (scall->c.rq.head != NULL)
rpc__dg_recvq_free(&scall->c.rq);
/*
* If a reject condition exists, prepare the reject response.
* Otherwise, handle the case where the stub has no [outs] and it's
* not a maybe call; we still need to generate a response pkt.
*
* We depend on both of these response queuing operations
* to only queue the response and not send it since we've yet
* setup the return cancel_pending status for the client.
*/
if (reject_st != rpc_s_ok)
{
/*
* If the reject path caused us to jump over the call into the
* stub, we need to free the request RQE here.
*
* If we are forced to do WAY auth and havn't done it so, don't free
* it because we don't own the rqe.
*/
if (! called_stub && !force_way_auth && iove.buff_dealloc != NULL)
RPC_FREE_IOVE_BUFFER(&iove);
queue_mapped_reject(scall, reject_st);
}
else
{
if (scall->c.state == rpc_e_dg_cs_recv && !maybe)
{
rpc_iovector_t xmit_data;
xmit_data.num_elt = 0;
rpc__dg_call_transmit_int(&scall->c, &xmit_data, &st);
/*
* The transmit may fail because the call is already orphaned.
* It may fail for some other reason as well. In either case,
* we're not gonna get a response to the client. Just keep
* falling through (other calls may fail as well) and clean up.
*/
}
}
/*
* At this point, we can stop accepting forwarded cancels. Determine
* the cancel pending disposition of the call and set the call's
* xq cancel_pending flag accordingly so that the response (or at
* least the last pkt of the response) gets sent with the proper
* state. This is the single point where the "send response"
* path ensures that it has flushed any pending cancels from the
* call executor thread; this includes cancels generated by
* a received cancel-request or a cancel induced by orphan call
* processing.
*
* We could have stopped accepting cancels as soon as the stub
* returned, but we really wanted to wait till here before setting
* up the return cancel_pending status. After this, we shouldn't
* screw around anymore with the xq (i.e. re-initing it). There
* should be a reject, fault or normal response queued up and
* it should go out with the correct cancel_pending flag.
* That is of course, unless that call has been orphaned, in which
* case no further response of any kind will be sent to the client
* (setting the cancel_pending flag will not affect the client;
* which is a *requirement* under this condition).
*/
if (rpc__cthread_cancel_caf(&scall->c.c))
{
RPC_DBG_PRINTF(rpc_e_dbg_cancel, 5,
("(rpc__dg_execute_call) setting cancel_pending\n"));
scall->c.xq.base_flags2 |= RPC_C_DG_PF2_CANCEL_PENDING;
}
/*
* Assuming that the call isn't already orphaned, finally push
* out the remainder of the response. The push may fail
* because orphaning occurs during the push or for some
* other reason; just continue to cleanup processing. Indicate
* whether or not the response was sent so we can determine
* the appropriate call state when we're done.
*/
if (scall->c.state != rpc_e_dg_cs_orphan)
{
rpc__dg_call_xmitq_push(&scall->c, &st);
if (st == rpc_s_ok)
sent_response = true;
else
RPC_DBG_GPRINTF((
"(rpc__dg_execute_call) xmitq_push returns 0x%x\n", st));
}
/*
* Error cases that want to skip the reply-sending machinery re-enter here.
*/
END_OF_CALL:
RPC_DG_CALL_LOCK_ASSERT(&scall->c);
/*
* End of the fast path.
*
* Any response has been sent (or at least all the pkts have been
* sent once). Perform final call wrap-up processing / state
* transitioning. In the event that we didn't take the send
* response path, we still need to flush any pending cancels.
* In the event that we took the send response path but the response
* wasn't succesfully sent, we'll call the following twice but
* that's ok.
*/
if (! sent_response)
(void) rpc__cthread_cancel_caf(&scall->c.c);
/*
* If the call is not "idempotent" we must defer complete end of
* call processing until the client's ack is received. (Note: "maybe"
* and "broadcast" are tagged as "idempotent".) For idempotent calls
* with small outs, we can clean up right now (if the client never
* gets the response, it can rerun the call).
*
* Idempotent calls with large outs are treated similarly to
* non-idempotent calls. We retain the outs until "acknowledged"
* by the client or the retransmit logic gives up. This is required
* to prevent the undesireable situation of the client receiving
* a "nocall" in response to a "ping" after the client has already
* received some of the outs.
*
* If we didn't (seemingly) successfully send a response, skip the
* final state (this covers orphan processing as well). Furthermore,
* if the call has been orphaned stay in that state.
*
* An orphaned call has already been disassociated from its SCTE
* (ccall in the case of a cbk_scall) and there should be a maximum
* of two references to the orphaned SCALL; the call executor's and
* the timer thread. The only actions required are to release any
* remaining resources held by the call and release one reference
* to the SCALL (the timer thread will eventually complete to job
* of destroying the scall).
*/
if ((! idem || RPC_DG_FLAG_IS_SET(scall->c.xq.base_flags, RPC_C_DG_PF_FRAG))
&& sent_response)
{
RPC_DG_CALL_SET_STATE(&scall->c, rpc_e_dg_cs_final);
}
else
{
/*
* It's really the end of the call, so we can free the xmitq.
*/
if (scall->c.xq.head != NULL)
rpc__dg_xmitq_free(&scall->c.xq, &scall->c);
/*
* Typically, the call goes back to the idle state, ready to
* handle the next call. First, If this was a callback, update
* the callback sequence number in the associated client callback
* handle.
*
* If the call was orphaned, we can't to do either of the above
* (we just want to let the scall's timer complete the job of
* destroying the scall).
*/
if (scall->c.state != rpc_e_dg_cs_orphan)
{
if (scall->c.is_cbk)
{
scall->cbk_ccall->c.high_seq = scall->c.call_seq;
}
RPC_DG_CALL_SET_STATE(&scall->c, rpc_e_dg_cs_idle);
}
}
/*
* Give up the packet reservation for this call.
*/
rpc__dg_pkt_cancel_reservation(&scall->c);
if (scall->c.is_cbk && scall->cbk_ccall != NULL)
{
/*
* Update the original ccall's high_rcv_frag_size and snd_frag_size.
*/
scall->cbk_ccall->c.rq.high_rcv_frag_size =
scall->c.rq.high_rcv_frag_size;
scall->cbk_ccall->c.xq.snd_frag_size = scall->c.xq.snd_frag_size;
}
/*
* We're now done with our scall lock/reference.
*/
scall->has_call_executor_ref = false;
RPC_DG_SCALL_RELEASE(&scall);
}