diff options
Diffstat (limited to 'freebsd/sys/rpc/clnt_vc.c')
| -rw-r--r-- | freebsd/sys/rpc/clnt_vc.c | 1081 |
1 files changed, 1081 insertions, 0 deletions
diff --git a/freebsd/sys/rpc/clnt_vc.c b/freebsd/sys/rpc/clnt_vc.c new file mode 100644 index 00000000..0231c303 --- /dev/null +++ b/freebsd/sys/rpc/clnt_vc.c @@ -0,0 +1,1081 @@ +/* $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_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); + } + 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; + bool_t do_read; + SVCXPRT *xprt; + struct cf_conn *cd; + + CTASSERT(sizeof(xid_plus_direction) == 2 * sizeof(uint32_t)); + ct->ct_upcallrefs++; + uio.uio_td = curthread; + do { + /* + * If ct_record_resid is zero, we are waiting for a + * record mark. + */ + if (ct->ct_record_resid == 0) { + + /* + * Make sure there is either a whole record + * mark in the buffer or there is some other + * error condition + */ + do_read = FALSE; + if (sbavail(&so->so_rcv) >= sizeof(uint32_t) + || (so->so_rcv.sb_state & SBS_CANTRCVMORE) + || so->so_error) + do_read = TRUE; + + if (!do_read) + break; + + SOCKBUF_UNLOCK(&so->so_rcv); + uio.uio_resid = sizeof(uint32_t); + m = NULL; + rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; + error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); + SOCKBUF_LOCK(&so->so_rcv); + + if (error == EWOULDBLOCK) + break; + + /* + * If there was an error, wake up all pending + * requests. + */ + if (error || uio.uio_resid > 0) { + wakeup_all: + mtx_lock(&ct->ct_lock); + if (!error) { + /* + * We must have got EOF trying + * to read from the stream. + */ + error = ECONNRESET; + } + 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); + break; + } + m_copydata(m, 0, sizeof(uint32_t), (char *)&header); + header = ntohl(header); + ct->ct_record = NULL; + ct->ct_record_resid = header & 0x7fffffff; + ct->ct_record_eor = ((header & 0x80000000) != 0); + m_freem(m); + } else { + /* + * Wait until the socket has the whole record + * buffered. + */ + do_read = FALSE; + if (sbavail(&so->so_rcv) >= ct->ct_record_resid + || (so->so_rcv.sb_state & SBS_CANTRCVMORE) + || so->so_error) + do_read = TRUE; + + if (!do_read) + break; + + /* + * We have the record mark. Read as much as + * the socket has buffered up to the end of + * this record. + */ + SOCKBUF_UNLOCK(&so->so_rcv); + uio.uio_resid = ct->ct_record_resid; + m = NULL; + rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; + error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); + SOCKBUF_LOCK(&so->so_rcv); + + if (error == EWOULDBLOCK) + break; + + if (error || uio.uio_resid == ct->ct_record_resid) + goto wakeup_all; + + /* + * If we have part of the record already, + * chain this bit onto the end. + */ + if (ct->ct_record) + m_last(ct->ct_record)->m_next = m; + else + ct->ct_record = m; + + ct->ct_record_resid = uio.uio_resid; + + /* + * If we have the entire record, see if we can + * match it to a request. + */ + if (ct->ct_record_resid == 0 + && 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)) { + m_freem(ct->ct_record); + break; + } + 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; + } + } + } + } while (m); + 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); +} |