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freebsd-skq/sys/rpc/clnt_vc.c
Rick Macklem b94b9a80b2 Fix up a comment added by r362455.
2020-06-21 02:49:56 +00:00

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/* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $ */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC";
static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* clnt_tcp.c, Implements a TCP/IP based, client side RPC.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*
* TCP based RPC supports 'batched calls'.
* A sequence of calls may be batched-up in a send buffer. The rpc call
* return immediately to the client even though the call was not necessarily
* sent. The batching occurs if the results' xdr routine is NULL (0) AND
* the rpc timeout value is zero (see clnt.h, rpc).
*
* Clients should NOT casually batch calls that in fact return results; that is,
* the server side should be aware that a call is batched and not produce any
* return message. Batched calls that produce many result messages can
* deadlock (netlock) the client and the server....
*
* Now go hang yourself.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sx.h>
#include <sys/syslog.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <net/vnet.h>
#include <netinet/tcp.h>
#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#include <rpc/krpc.h>
struct cmessage {
struct cmsghdr cmsg;
struct cmsgcred cmcred;
};
static enum clnt_stat clnt_vc_call(CLIENT *, struct rpc_callextra *,
rpcproc_t, struct mbuf *, struct mbuf **, struct timeval);
static void clnt_vc_geterr(CLIENT *, struct rpc_err *);
static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *);
static void clnt_vc_abort(CLIENT *);
static bool_t clnt_vc_control(CLIENT *, u_int, void *);
static void clnt_vc_close(CLIENT *);
static void clnt_vc_destroy(CLIENT *);
static bool_t time_not_ok(struct timeval *);
static int clnt_vc_soupcall(struct socket *so, void *arg, int waitflag);
static struct clnt_ops clnt_vc_ops = {
.cl_call = clnt_vc_call,
.cl_abort = clnt_vc_abort,
.cl_geterr = clnt_vc_geterr,
.cl_freeres = clnt_vc_freeres,
.cl_close = clnt_vc_close,
.cl_destroy = clnt_vc_destroy,
.cl_control = clnt_vc_control
};
static void clnt_vc_upcallsdone(struct ct_data *);
static int fake_wchan;
/*
* Create a client handle for a connection.
* Default options are set, which the user can change using clnt_control()'s.
* The rpc/vc package does buffering similar to stdio, so the client
* must pick send and receive buffer sizes, 0 => use the default.
* NB: fd is copied into a private area.
* NB: The rpch->cl_auth is set null authentication. Caller may wish to
* set this something more useful.
*
* fd should be an open socket
*/
CLIENT *
clnt_vc_create(
struct socket *so, /* open file descriptor */
struct sockaddr *raddr, /* servers address */
const rpcprog_t prog, /* program number */
const rpcvers_t vers, /* version number */
size_t sendsz, /* buffer recv size */
size_t recvsz, /* buffer send size */
int intrflag) /* interruptible */
{
CLIENT *cl; /* client handle */
struct ct_data *ct = NULL; /* client handle */
struct timeval now;
struct rpc_msg call_msg;
static uint32_t disrupt;
struct __rpc_sockinfo si;
XDR xdrs;
int error, interrupted, one = 1, sleep_flag;
struct sockopt sopt;
if (disrupt == 0)
disrupt = (uint32_t)(long)raddr;
cl = (CLIENT *)mem_alloc(sizeof (*cl));
ct = (struct ct_data *)mem_alloc(sizeof (*ct));
mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF);
ct->ct_threads = 0;
ct->ct_closing = FALSE;
ct->ct_closed = FALSE;
ct->ct_upcallrefs = 0;
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
error = soconnect(so, raddr, curthread);
SOCK_LOCK(so);
interrupted = 0;
sleep_flag = PSOCK;
if (intrflag != 0)
sleep_flag |= PCATCH;
while ((so->so_state & SS_ISCONNECTING)
&& so->so_error == 0) {
error = msleep(&so->so_timeo, SOCK_MTX(so),
sleep_flag, "connec", 0);
if (error) {
if (error == EINTR || error == ERESTART)
interrupted = 1;
break;
}
}
if (error == 0) {
error = so->so_error;
so->so_error = 0;
}
SOCK_UNLOCK(so);
if (error) {
if (!interrupted)
so->so_state &= ~SS_ISCONNECTING;
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = error;
goto err;
}
}
if (!__rpc_socket2sockinfo(so, &si)) {
goto err;
}
if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
bzero(&sopt, sizeof(sopt));
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = SOL_SOCKET;
sopt.sopt_name = SO_KEEPALIVE;
sopt.sopt_val = &one;
sopt.sopt_valsize = sizeof(one);
sosetopt(so, &sopt);
}
if (so->so_proto->pr_protocol == IPPROTO_TCP) {
bzero(&sopt, sizeof(sopt));
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = IPPROTO_TCP;
sopt.sopt_name = TCP_NODELAY;
sopt.sopt_val = &one;
sopt.sopt_valsize = sizeof(one);
sosetopt(so, &sopt);
}
ct->ct_closeit = FALSE;
/*
* Set up private data struct
*/
ct->ct_socket = so;
ct->ct_wait.tv_sec = -1;
ct->ct_wait.tv_usec = -1;
memcpy(&ct->ct_addr, raddr, raddr->sa_len);
/*
* Initialize call message
*/
getmicrotime(&now);
ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now);
call_msg.rm_xid = ct->ct_xid;
call_msg.rm_direction = CALL;
call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
call_msg.rm_call.cb_prog = (uint32_t)prog;
call_msg.rm_call.cb_vers = (uint32_t)vers;
/*
* pre-serialize the static part of the call msg and stash it away
*/
xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE,
XDR_ENCODE);
if (! xdr_callhdr(&xdrs, &call_msg)) {
if (ct->ct_closeit) {
soclose(ct->ct_socket);
}
goto err;
}
ct->ct_mpos = XDR_GETPOS(&xdrs);
XDR_DESTROY(&xdrs);
ct->ct_waitchan = "rpcrecv";
ct->ct_waitflag = 0;
/*
* Create a client handle which uses xdrrec for serialization
* and authnone for authentication.
*/
sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
error = soreserve(ct->ct_socket, sendsz, recvsz);
if (error != 0) {
if (ct->ct_closeit) {
soclose(ct->ct_socket);
}
goto err;
}
cl->cl_refs = 1;
cl->cl_ops = &clnt_vc_ops;
cl->cl_private = ct;
cl->cl_auth = authnone_create();
SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
soupcall_set(ct->ct_socket, SO_RCV, clnt_vc_soupcall, ct);
SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
ct->ct_raw = NULL;
ct->ct_record = NULL;
ct->ct_record_resid = 0;
TAILQ_INIT(&ct->ct_pending);
return (cl);
err:
mtx_destroy(&ct->ct_lock);
mem_free(ct, sizeof (struct ct_data));
mem_free(cl, sizeof (CLIENT));
return ((CLIENT *)NULL);
}
static enum clnt_stat
clnt_vc_call(
CLIENT *cl, /* client handle */
struct rpc_callextra *ext, /* call metadata */
rpcproc_t proc, /* procedure number */
struct mbuf *args, /* pointer to args */
struct mbuf **resultsp, /* pointer to results */
struct timeval utimeout)
{
struct ct_data *ct = (struct ct_data *) cl->cl_private;
AUTH *auth;
struct rpc_err *errp;
enum clnt_stat stat;
XDR xdrs;
struct rpc_msg reply_msg;
bool_t ok;
int nrefreshes = 2; /* number of times to refresh cred */
struct timeval timeout;
uint32_t xid;
struct mbuf *mreq = NULL, *results;
struct ct_request *cr;
int error, trycnt;
cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK);
mtx_lock(&ct->ct_lock);
if (ct->ct_closing || ct->ct_closed) {
mtx_unlock(&ct->ct_lock);
free(cr, M_RPC);
return (RPC_CANTSEND);
}
ct->ct_threads++;
if (ext) {
auth = ext->rc_auth;
errp = &ext->rc_err;
} else {
auth = cl->cl_auth;
errp = &ct->ct_error;
}
cr->cr_mrep = NULL;
cr->cr_error = 0;
if (ct->ct_wait.tv_usec == -1) {
timeout = utimeout; /* use supplied timeout */
} else {
timeout = ct->ct_wait; /* use default timeout */
}
/*
* After 15sec of looping, allow it to return RPC_CANTSEND, which will
* cause the clnt_reconnect layer to create a new TCP connection.
*/
trycnt = 15 * hz;
call_again:
mtx_assert(&ct->ct_lock, MA_OWNED);
if (ct->ct_closing || ct->ct_closed) {
ct->ct_threads--;
wakeup(ct);
mtx_unlock(&ct->ct_lock);
free(cr, M_RPC);
return (RPC_CANTSEND);
}
ct->ct_xid++;
xid = ct->ct_xid;
mtx_unlock(&ct->ct_lock);
/*
* Leave space to pre-pend the record mark.
*/
mreq = m_gethdr(M_WAITOK, MT_DATA);
mreq->m_data += sizeof(uint32_t);
KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN,
("RPC header too big"));
bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos);
mreq->m_len = ct->ct_mpos;
/*
* The XID is the first thing in the request.
*/
*mtod(mreq, uint32_t *) = htonl(xid);
xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
errp->re_status = stat = RPC_SUCCESS;
if ((! XDR_PUTINT32(&xdrs, &proc)) ||
(! AUTH_MARSHALL(auth, xid, &xdrs,
m_copym(args, 0, M_COPYALL, M_WAITOK)))) {
errp->re_status = stat = RPC_CANTENCODEARGS;
mtx_lock(&ct->ct_lock);
goto out;
}
mreq->m_pkthdr.len = m_length(mreq, NULL);
/*
* Prepend a record marker containing the packet length.
*/
M_PREPEND(mreq, sizeof(uint32_t), M_WAITOK);
*mtod(mreq, uint32_t *) =
htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t)));
cr->cr_xid = xid;
mtx_lock(&ct->ct_lock);
/*
* Check to see if the other end has already started to close down
* the connection. The upcall will have set ct_error.re_status
* to RPC_CANTRECV if this is the case.
* If the other end starts to close down the connection after this
* point, it will be detected later when cr_error is checked,
* since the request is in the ct_pending queue.
*/
if (ct->ct_error.re_status == RPC_CANTRECV) {
if (errp != &ct->ct_error) {
errp->re_errno = ct->ct_error.re_errno;
errp->re_status = RPC_CANTRECV;
}
stat = RPC_CANTRECV;
goto out;
}
TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link);
mtx_unlock(&ct->ct_lock);
/*
* sosend consumes mreq.
*/
error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread);
mreq = NULL;
if (error == EMSGSIZE || (error == ERESTART &&
(ct->ct_waitflag & PCATCH) == 0 && trycnt-- > 0)) {
SOCKBUF_LOCK(&ct->ct_socket->so_snd);
sbwait(&ct->ct_socket->so_snd);
SOCKBUF_UNLOCK(&ct->ct_socket->so_snd);
AUTH_VALIDATE(auth, xid, NULL, NULL);
mtx_lock(&ct->ct_lock);
TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
/* Sleep for 1 clock tick before trying the sosend() again. */
msleep(&fake_wchan, &ct->ct_lock, 0, "rpclpsnd", 1);
goto call_again;
}
reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL;
reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf;
reply_msg.acpted_rply.ar_verf.oa_length = 0;
reply_msg.acpted_rply.ar_results.where = NULL;
reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
mtx_lock(&ct->ct_lock);
if (error) {
TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
errp->re_errno = error;
errp->re_status = stat = RPC_CANTSEND;
goto out;
}
/*
* Check to see if we got an upcall while waiting for the
* lock. In both these cases, the request has been removed
* from ct->ct_pending.
*/
if (cr->cr_error) {
TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
errp->re_errno = cr->cr_error;
errp->re_status = stat = RPC_CANTRECV;
goto out;
}
if (cr->cr_mrep) {
TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
goto got_reply;
}
/*
* Hack to provide rpc-based message passing
*/
if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
errp->re_status = stat = RPC_TIMEDOUT;
goto out;
}
error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan,
tvtohz(&timeout));
TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
if (error) {
/*
* The sleep returned an error so our request is still
* on the list. Turn the error code into an
* appropriate client status.
*/
errp->re_errno = error;
switch (error) {
case EINTR:
stat = RPC_INTR;
break;
case EWOULDBLOCK:
stat = RPC_TIMEDOUT;
break;
default:
stat = RPC_CANTRECV;
}
errp->re_status = stat;
goto out;
} else {
/*
* We were woken up by the upcall. If the
* upcall had a receive error, report that,
* otherwise we have a reply.
*/
if (cr->cr_error) {
errp->re_errno = cr->cr_error;
errp->re_status = stat = RPC_CANTRECV;
goto out;
}
}
got_reply:
/*
* Now decode and validate the response. We need to drop the
* lock since xdr_replymsg may end up sleeping in malloc.
*/
mtx_unlock(&ct->ct_lock);
if (ext && ext->rc_feedback)
ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
ok = xdr_replymsg(&xdrs, &reply_msg);
cr->cr_mrep = NULL;
if (ok) {
if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
(reply_msg.acpted_rply.ar_stat == SUCCESS))
errp->re_status = stat = RPC_SUCCESS;
else
stat = _seterr_reply(&reply_msg, errp);
if (stat == RPC_SUCCESS) {
results = xdrmbuf_getall(&xdrs);
if (!AUTH_VALIDATE(auth, xid,
&reply_msg.acpted_rply.ar_verf,
&results)) {
errp->re_status = stat = RPC_AUTHERROR;
errp->re_why = AUTH_INVALIDRESP;
} else {
KASSERT(results,
("auth validated but no result"));
*resultsp = results;
}
} /* end successful completion */
/*
* If unsuccessful AND error is an authentication error
* then refresh credentials and try again, else break
*/
else if (stat == RPC_AUTHERROR)
/* maybe our credentials need to be refreshed ... */
if (nrefreshes > 0 &&
AUTH_REFRESH(auth, &reply_msg)) {
nrefreshes--;
XDR_DESTROY(&xdrs);
mtx_lock(&ct->ct_lock);
goto call_again;
}
/* end of unsuccessful completion */
} /* end of valid reply message */
else {
errp->re_status = stat = RPC_CANTDECODERES;
}
XDR_DESTROY(&xdrs);
mtx_lock(&ct->ct_lock);
out:
mtx_assert(&ct->ct_lock, MA_OWNED);
KASSERT(stat != RPC_SUCCESS || *resultsp,
("RPC_SUCCESS without reply"));
if (mreq)
m_freem(mreq);
if (cr->cr_mrep)
m_freem(cr->cr_mrep);
ct->ct_threads--;
if (ct->ct_closing)
wakeup(ct);
mtx_unlock(&ct->ct_lock);
if (auth && stat != RPC_SUCCESS)
AUTH_VALIDATE(auth, xid, NULL, NULL);
free(cr, M_RPC);
return (stat);
}
static void
clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp)
{
struct ct_data *ct = (struct ct_data *) cl->cl_private;
*errp = ct->ct_error;
}
static bool_t
clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
{
XDR xdrs;
bool_t dummy;
xdrs.x_op = XDR_FREE;
dummy = (*xdr_res)(&xdrs, res_ptr);
return (dummy);
}
/*ARGSUSED*/
static void
clnt_vc_abort(CLIENT *cl)
{
}
static bool_t
clnt_vc_control(CLIENT *cl, u_int request, void *info)
{
struct ct_data *ct = (struct ct_data *)cl->cl_private;
void *infop = info;
SVCXPRT *xprt;
mtx_lock(&ct->ct_lock);
switch (request) {
case CLSET_FD_CLOSE:
ct->ct_closeit = TRUE;
mtx_unlock(&ct->ct_lock);
return (TRUE);
case CLSET_FD_NCLOSE:
ct->ct_closeit = FALSE;
mtx_unlock(&ct->ct_lock);
return (TRUE);
default:
break;
}
/* for other requests which use info */
if (info == NULL) {
mtx_unlock(&ct->ct_lock);
return (FALSE);
}
switch (request) {
case CLSET_TIMEOUT:
if (time_not_ok((struct timeval *)info)) {
mtx_unlock(&ct->ct_lock);
return (FALSE);
}
ct->ct_wait = *(struct timeval *)infop;
break;
case CLGET_TIMEOUT:
*(struct timeval *)infop = ct->ct_wait;
break;
case CLGET_SERVER_ADDR:
(void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len);
break;
case CLGET_SVC_ADDR:
/*
* Slightly different semantics to userland - we use
* sockaddr instead of netbuf.
*/
memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len);
break;
case CLSET_SVC_ADDR: /* set to new address */
mtx_unlock(&ct->ct_lock);
return (FALSE);
case CLGET_XID:
*(uint32_t *)info = ct->ct_xid;
break;
case CLSET_XID:
/* This will set the xid of the NEXT call */
/* decrement by 1 as clnt_vc_call() increments once */
ct->ct_xid = *(uint32_t *)info - 1;
break;
case CLGET_VERS:
/*
* This RELIES on the information that, in the call body,
* the version number field is the fifth field from the
* beginning of the RPC header. MUST be changed if the
* call_struct is changed
*/
*(uint32_t *)info =
ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
4 * BYTES_PER_XDR_UNIT));
break;
case CLSET_VERS:
*(uint32_t *)(void *)(ct->ct_mcallc +
4 * BYTES_PER_XDR_UNIT) =
htonl(*(uint32_t *)info);
break;
case CLGET_PROG:
/*
* This RELIES on the information that, in the call body,
* the program number field is the fourth field from the
* beginning of the RPC header. MUST be changed if the
* call_struct is changed
*/
*(uint32_t *)info =
ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
3 * BYTES_PER_XDR_UNIT));
break;
case CLSET_PROG:
*(uint32_t *)(void *)(ct->ct_mcallc +
3 * BYTES_PER_XDR_UNIT) =
htonl(*(uint32_t *)info);
break;
case CLSET_WAITCHAN:
ct->ct_waitchan = (const char *)info;
break;
case CLGET_WAITCHAN:
*(const char **) info = ct->ct_waitchan;
break;
case CLSET_INTERRUPTIBLE:
if (*(int *) info)
ct->ct_waitflag = PCATCH;
else
ct->ct_waitflag = 0;
break;
case CLGET_INTERRUPTIBLE:
if (ct->ct_waitflag)
*(int *) info = TRUE;
else
*(int *) info = FALSE;
break;
case CLSET_BACKCHANNEL:
xprt = (SVCXPRT *)info;
if (ct->ct_backchannelxprt == NULL) {
xprt->xp_p2 = ct;
ct->ct_backchannelxprt = xprt;
}
break;
default:
mtx_unlock(&ct->ct_lock);
return (FALSE);
}
mtx_unlock(&ct->ct_lock);
return (TRUE);
}
static void
clnt_vc_close(CLIENT *cl)
{
struct ct_data *ct = (struct ct_data *) cl->cl_private;
struct ct_request *cr;
mtx_lock(&ct->ct_lock);
if (ct->ct_closed) {
mtx_unlock(&ct->ct_lock);
return;
}
if (ct->ct_closing) {
while (ct->ct_closing)
msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
KASSERT(ct->ct_closed, ("client should be closed"));
mtx_unlock(&ct->ct_lock);
return;
}
if (ct->ct_socket) {
ct->ct_closing = TRUE;
mtx_unlock(&ct->ct_lock);
SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
soupcall_clear(ct->ct_socket, SO_RCV);
clnt_vc_upcallsdone(ct);
SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
/*
* Abort any pending requests and wait until everyone
* has finished with clnt_vc_call.
*/
mtx_lock(&ct->ct_lock);
TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
cr->cr_xid = 0;
cr->cr_error = ESHUTDOWN;
wakeup(cr);
}
while (ct->ct_threads)
msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
}
ct->ct_closing = FALSE;
ct->ct_closed = TRUE;
mtx_unlock(&ct->ct_lock);
wakeup(ct);
}
static void
clnt_vc_destroy(CLIENT *cl)
{
struct ct_data *ct = (struct ct_data *) cl->cl_private;
struct socket *so = NULL;
SVCXPRT *xprt;
clnt_vc_close(cl);
mtx_lock(&ct->ct_lock);
xprt = ct->ct_backchannelxprt;
ct->ct_backchannelxprt = NULL;
if (xprt != NULL) {
mtx_unlock(&ct->ct_lock); /* To avoid a LOR. */
sx_xlock(&xprt->xp_lock);
mtx_lock(&ct->ct_lock);
xprt->xp_p2 = NULL;
sx_xunlock(&xprt->xp_lock);
}
if (ct->ct_socket) {
if (ct->ct_closeit) {
so = ct->ct_socket;
}
}
mtx_unlock(&ct->ct_lock);
mtx_destroy(&ct->ct_lock);
if (so) {
soshutdown(so, SHUT_WR);
soclose(so);
}
m_freem(ct->ct_record);
m_freem(ct->ct_raw);
mem_free(ct, sizeof(struct ct_data));
if (cl->cl_netid && cl->cl_netid[0])
mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
if (cl->cl_tp && cl->cl_tp[0])
mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
mem_free(cl, sizeof(CLIENT));
}
/*
* Make sure that the time is not garbage. -1 value is disallowed.
* Note this is different from time_not_ok in clnt_dg.c
*/
static bool_t
time_not_ok(struct timeval *t)
{
return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
t->tv_usec <= -1 || t->tv_usec > 1000000);
}
int
clnt_vc_soupcall(struct socket *so, void *arg, int waitflag)
{
struct ct_data *ct = (struct ct_data *) arg;
struct uio uio;
struct mbuf *m, *m2;
struct ct_request *cr;
int error, rcvflag, foundreq;
uint32_t xid_plus_direction[2], header;
SVCXPRT *xprt;
struct cf_conn *cd;
u_int rawlen;
/*
* If another thread is already here, it must be in
* soreceive(), so just return to avoid races with it.
* ct_upcallrefs is protected by the SOCKBUF_LOCK(),
* which is held in this function, except when
* soreceive() is called.
*/
if (ct->ct_upcallrefs > 0)
return (SU_OK);
ct->ct_upcallrefs++;
/*
* Read as much as possible off the socket and link it
* onto ct_raw.
*/
for (;;) {
uio.uio_resid = 1000000000;
uio.uio_td = curthread;
m2 = m = NULL;
rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
SOCKBUF_UNLOCK(&so->so_rcv);
error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
SOCKBUF_LOCK(&so->so_rcv);
if (error == EWOULDBLOCK) {
/*
* We must re-test for readability after
* taking the lock to protect us in the case
* where a new packet arrives on the socket
* after our call to soreceive fails with
* EWOULDBLOCK.
*/
error = 0;
if (!soreadable(so))
break;
continue;
}
if (error == 0 && m == NULL) {
/*
* We must have got EOF trying
* to read from the stream.
*/
error = ECONNRESET;
}
if (error != 0)
break;
if (ct->ct_raw != NULL)
m_last(ct->ct_raw)->m_next = m;
else
ct->ct_raw = m;
}
rawlen = m_length(ct->ct_raw, NULL);
/* Now, process as much of ct_raw as possible. */
for (;;) {
/*
* If ct_record_resid is zero, we are waiting for a
* record mark.
*/
if (ct->ct_record_resid == 0) {
if (rawlen < sizeof(uint32_t))
break;
m_copydata(ct->ct_raw, 0, sizeof(uint32_t),
(char *)&header);
header = ntohl(header);
ct->ct_record_resid = header & 0x7fffffff;
ct->ct_record_eor = ((header & 0x80000000) != 0);
m_adj(ct->ct_raw, sizeof(uint32_t));
rawlen -= sizeof(uint32_t);
} else {
/*
* Move as much of the record as possible to
* ct_record.
*/
if (rawlen == 0)
break;
if (rawlen <= ct->ct_record_resid) {
if (ct->ct_record != NULL)
m_last(ct->ct_record)->m_next =
ct->ct_raw;
else
ct->ct_record = ct->ct_raw;
ct->ct_raw = NULL;
ct->ct_record_resid -= rawlen;
rawlen = 0;
} else {
m = m_split(ct->ct_raw, ct->ct_record_resid,
M_NOWAIT);
if (m == NULL)
break;
if (ct->ct_record != NULL)
m_last(ct->ct_record)->m_next =
ct->ct_raw;
else
ct->ct_record = ct->ct_raw;
rawlen -= ct->ct_record_resid;
ct->ct_record_resid = 0;
ct->ct_raw = m;
}
if (ct->ct_record_resid > 0)
break;
/*
* If we have the entire record, see if we can
* match it to a request.
*/
if (ct->ct_record_eor) {
/*
* The XID is in the first uint32_t of
* the reply and the message direction
* is the second one.
*/
if (ct->ct_record->m_len <
sizeof(xid_plus_direction) &&
m_length(ct->ct_record, NULL) <
sizeof(xid_plus_direction)) {
/*
* What to do now?
* The data in the TCP stream is
* corrupted such that there is no
* valid RPC message to parse.
* I think it best to close this
* connection and allow
* clnt_reconnect_call() to try
* and establish a new one.
*/
printf("clnt_vc_soupcall: "
"connection data corrupted\n");
error = ECONNRESET;
goto wakeup_all;
}
m_copydata(ct->ct_record, 0,
sizeof(xid_plus_direction),
(char *)xid_plus_direction);
xid_plus_direction[0] =
ntohl(xid_plus_direction[0]);
xid_plus_direction[1] =
ntohl(xid_plus_direction[1]);
/* Check message direction. */
if (xid_plus_direction[1] == CALL) {
/* This is a backchannel request. */
mtx_lock(&ct->ct_lock);
xprt = ct->ct_backchannelxprt;
if (xprt == NULL) {
mtx_unlock(&ct->ct_lock);
/* Just throw it away. */
m_freem(ct->ct_record);
ct->ct_record = NULL;
} else {
cd = (struct cf_conn *)
xprt->xp_p1;
m2 = cd->mreq;
/*
* The requests are chained
* in the m_nextpkt list.
*/
while (m2 != NULL &&
m2->m_nextpkt != NULL)
/* Find end of list. */
m2 = m2->m_nextpkt;
if (m2 != NULL)
m2->m_nextpkt =
ct->ct_record;
else
cd->mreq =
ct->ct_record;
ct->ct_record->m_nextpkt =
NULL;
ct->ct_record = NULL;
xprt_active(xprt);
mtx_unlock(&ct->ct_lock);
}
} else {
mtx_lock(&ct->ct_lock);
foundreq = 0;
TAILQ_FOREACH(cr, &ct->ct_pending,
cr_link) {
if (cr->cr_xid ==
xid_plus_direction[0]) {
/*
* This one
* matches. We leave
* the reply mbuf in
* cr->cr_mrep. Set
* the XID to zero so
* that we will ignore
* any duplicated
* replies.
*/
cr->cr_xid = 0;
cr->cr_mrep =
ct->ct_record;
cr->cr_error = 0;
foundreq = 1;
wakeup(cr);
break;
}
}
mtx_unlock(&ct->ct_lock);
if (!foundreq)
m_freem(ct->ct_record);
ct->ct_record = NULL;
}
}
}
}
if (error != 0) {
wakeup_all:
/*
* This socket is broken, so mark that it cannot
* receive and fail all RPCs waiting for a reply
* on it, so that they will be retried on a new
* TCP connection created by clnt_reconnect_X().
*/
mtx_lock(&ct->ct_lock);
ct->ct_error.re_status = RPC_CANTRECV;
ct->ct_error.re_errno = error;
TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
cr->cr_error = error;
wakeup(cr);
}
mtx_unlock(&ct->ct_lock);
}
ct->ct_upcallrefs--;
if (ct->ct_upcallrefs < 0)
panic("rpcvc upcall refcnt");
if (ct->ct_upcallrefs == 0)
wakeup(&ct->ct_upcallrefs);
return (SU_OK);
}
/*
* Wait for all upcalls in progress to complete.
*/
static void
clnt_vc_upcallsdone(struct ct_data *ct)
{
SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv);
while (ct->ct_upcallrefs > 0)
(void) msleep(&ct->ct_upcallrefs,
SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0);
}
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