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freebsd/sys/rpc/rpcclnt.c
Jim Rees 23350221ac Fix up some cut-n-paste damage and some out-of-date comments. 
No code changes.

Submitted by:	cel@citi.umich.edu
2006-01-20 15:20:41 +00:00

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/* $FreeBSD$ */
/* $Id: rpcclnt.c,v 1.9 2003/11/05 14:59:03 rees Exp $ */
/*-
* copyright (c) 2003
* the regents of the university of michigan
* all rights reserved
*
* permission is granted to use, copy, create derivative works and redistribute
* this software and such derivative works for any purpose, so long as the name
* of the university of michigan is not used in any advertising or publicity
* pertaining to the use or distribution of this software without specific,
* written prior authorization. if the above copyright notice or any other
* identification of the university of michigan is included in any copy of any
* portion of this software, then the disclaimer below must also be included.
*
* this software is provided as is, without representation from the university
* of michigan as to its fitness for any purpose, and without warranty by the
* university of michigan of any kind, either express or implied, including
* without limitation the implied warranties of merchantability and fitness for
* a particular purpose. the regents of the university of michigan shall not be
* liable for any damages, including special, indirect, incidental, or
* consequential damages, with respect to any claim arising out of or in
* connection with the use of the software, even if it has been or is hereafter
* advised of the possibility of such damages.
*/
/*-
* Copyright (c) 1989, 1991, 1993, 1995 The Regents of the University of
* California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by Rick Macklem at
* The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer. 2.
* 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. 3. All advertising
* materials mentioning features or use of this software must display the
* following acknowledgement: This product includes software developed by the
* University of California, Berkeley and its contributors. 4. Neither the
* name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95
*/
/* XXX: kill ugly debug strings */
/* XXX: get rid of proct, as it is not even being used... (or keep it so v{2,3}
* can run, but clean it up! */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <sys/lock.h>
#include <sys/signalvar.h>
#include <sys/sysent.h>
#include <sys/syscall.h>
#include <sys/sysctl.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mutex.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <nfs/rpcv2.h>
#include <rpc/rpcm_subs.h>
#include <rpc/rpcclnt.h>
/* memory management */
#ifdef __OpenBSD__
struct pool rpctask_pool;
struct pool rpcclnt_pool;
#define RPCTASKPOOL_LWM 10
#define RPCTASKPOOL_HWM 40
#else
static MALLOC_DEFINE(M_RPC, "rpcclnt", "rpc state");
#endif
#define RPC_RETURN(X) do { RPCDEBUG("returning %d", X); return X; }while(0)
/*
* Estimate rto for an nfs rpc sent via. an unreliable datagram. Use the mean
* and mean deviation of rtt for the appropriate type of rpc for the frequent
* rpcs and a default for the others. The justification for doing "other"
* this way is that these rpcs happen so infrequently that timer est. would
* probably be stale. Also, since many of these rpcs are non-idempotent, a
* conservative timeout is desired. getattr, lookup - A+2D read, write -
* A+4D other - nm_timeo
*/
#define RPC_RTO(n, t) \
((t) == 0 ? (n)->rc_timeo : \
((t) < 3 ? \
(((((n)->rc_srtt[t-1] + 3) >> 2) + (n)->rc_sdrtt[t-1] + 1) >> 1) : \
((((n)->rc_srtt[t-1] + 7) >> 3) + (n)->rc_sdrtt[t-1] + 1)))
#define RPC_SRTT(s,r) (r)->r_rpcclnt->rc_srtt[rpcclnt_proct((s),\
(r)->r_procnum) - 1]
#define RPC_SDRTT(s,r) (r)->r_rpcclnt->rc_sdrtt[rpcclnt_proct((s),\
(r)->r_procnum) - 1]
/*
* There is a congestion window for outstanding rpcs maintained per mount
* point. The cwnd size is adjusted in roughly the way that: Van Jacobson,
* Congestion avoidance and Control, In "Proceedings of SIGCOMM '88". ACM,
* August 1988. describes for TCP. The cwnd size is chopped in half on a
* retransmit timeout and incremented by 1/cwnd when each rpc reply is
* received and a full cwnd of rpcs is in progress. (The sent count and cwnd
* are scaled for integer arith.) Variants of "slow start" were tried and
* were found to be too much of a performance hit (ave. rtt 3 times larger),
* I suspect due to the large rtt that nfs rpcs have.
*/
#define RPC_CWNDSCALE 256
#define RPC_MAXCWND (RPC_CWNDSCALE * 32)
static const int rpcclnt_backoff[8] = {2, 4, 8, 16, 32, 64, 128, 256,};
/* XXX ugly debug strings */
#define RPC_ERRSTR_ACCEPTED_SIZE 6
char *rpc_errstr_accepted[RPC_ERRSTR_ACCEPTED_SIZE] = {
"", /* no good message... */
"remote server hasn't exported program.",
"remote server can't support version number.",
"program can't support procedure.",
"procedure can't decode params.",
"remote error. remote side memory allocation failure?"
};
char *rpc_errstr_denied[2] = {
"remote server doesnt support rpc version 2!",
"remote server authentication error."
};
#define RPC_ERRSTR_AUTH_SIZE 6
char *rpc_errstr_auth[RPC_ERRSTR_AUTH_SIZE] = {
"",
"auth error: bad credential (seal broken).",
"auth error: client must begin new session.",
"auth error: bad verifier (seal broken).",
"auth error: verifier expired or replayed.",
"auth error: rejected for security reasons.",
};
/*
* Static data, mostly RPC constants in XDR form
*/
static u_int32_t rpc_reply, rpc_call, rpc_vers;
/*
* rpc_msgdenied, rpc_mismatch, rpc_auth_unix, rpc_msgaccepted,
* rpc_autherr, rpc_auth_kerb;
*/
static u_int32_t rpcclnt_xid = 0;
static u_int32_t rpcclnt_xid_touched = 0;
struct rpcstats rpcstats;
int rpcclnt_ticks;
SYSCTL_NODE(_kern, OID_AUTO, rpc, CTLFLAG_RD, 0, "RPC Subsystem");
SYSCTL_UINT(_kern_rpc, OID_AUTO, retries, CTLFLAG_RD, &rpcstats.rpcretries, 0, "retries");
SYSCTL_UINT(_kern_rpc, OID_AUTO, request, CTLFLAG_RD, &rpcstats.rpcrequests, 0, "request");
SYSCTL_UINT(_kern_rpc, OID_AUTO, timeouts, CTLFLAG_RD, &rpcstats.rpctimeouts, 0, "timeouts");
SYSCTL_UINT(_kern_rpc, OID_AUTO, unexpected, CTLFLAG_RD, &rpcstats.rpcunexpected, 0, "unexpected");
SYSCTL_UINT(_kern_rpc, OID_AUTO, invalid, CTLFLAG_RD, &rpcstats.rpcinvalid, 0, "invalid");
#ifdef RPCCLNT_DEBUG
int rpcdebugon = 0;
SYSCTL_UINT(_kern_rpc, OID_AUTO, debug_on, CTLFLAG_RW, &rpcdebugon, 0, "RPC Debug messages");
#endif
/*
* Queue head for rpctask's
*/
static
TAILQ_HEAD(, rpctask) rpctask_q;
struct callout rpcclnt_callout;
#ifdef __OpenBSD__
static int rpcclnt_send(struct socket *, struct mbuf *, struct mbuf *, struct rpctask *);
static int rpcclnt_receive(struct rpctask *, struct mbuf **, struct mbuf **, RPC_EXEC_CTX);
#else
static int rpcclnt_send(struct socket *, struct sockaddr *, struct mbuf *, struct rpctask *);
static int rpcclnt_receive(struct rpctask *, struct sockaddr **, struct mbuf **, RPC_EXEC_CTX);
#endif
static int rpcclnt_msg(RPC_EXEC_CTX, const char *, char *);
static int rpcclnt_reply(struct rpctask *, RPC_EXEC_CTX);
static void rpcclnt_timer(void *);
static int rpcclnt_sndlock(int *, struct rpctask *);
static void rpcclnt_sndunlock(int *);
static int rpcclnt_rcvlock(struct rpctask *);
static void rpcclnt_rcvunlock(int *);
#if 0
void rpcclnt_realign(struct mbuf *, int);
#else
static void rpcclnt_realign(struct mbuf **, int);
#endif
static struct mbuf *rpcclnt_buildheader(struct rpcclnt *, int, struct mbuf *, u_int32_t, int *, struct mbuf **, struct ucred *);
static int rpcm_disct(struct mbuf **, caddr_t *, int, int, caddr_t *);
static u_int32_t rpcclnt_proct(struct rpcclnt *, u_int32_t);
static int rpc_adv(struct mbuf **, caddr_t *, int, int);
static void rpcclnt_softterm(struct rpctask * task);
static int rpcauth_buildheader(struct rpc_auth * auth, struct ucred *, struct mbuf **, caddr_t *);
void
rpcclnt_init(void)
{
#ifdef __OpenBSD__
static struct timeout rpcclnt_timer_to;
#endif
rpcclnt_ticks = (hz * RPC_TICKINTVL + 500) / 1000;
if (rpcclnt_ticks < 1)
rpcclnt_ticks = 1;
rpcstats.rpcretries = 0;
rpcstats.rpcrequests = 0;
rpcstats.rpctimeouts = 0;
rpcstats.rpcunexpected = 0;
rpcstats.rpcinvalid = 0;
/*
* rpc constants how about actually using more than one of these!
*/
rpc_reply = txdr_unsigned(RPC_REPLY);
rpc_vers = txdr_unsigned(RPC_VER2);
rpc_call = txdr_unsigned(RPC_CALL);
#if 0
rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
rpc_autherr = txdr_unsigned(RPC_AUTHERR);
rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
rpc_auth_kerb = txdr_unsigned(RPCAUTH_KERB4);
#endif
/* initialize rpctask queue */
TAILQ_INIT(&rpctask_q);
#ifdef __OpenBSD__
/* initialize pools */
pool_init(&rpctask_pool, sizeof(struct rpctask), 0, 0, RPCTASKPOOL_LWM,
"rpctask_p", NULL);
pool_setlowat(&rpctask_pool, RPCTASKPOOL_LWM);
pool_sethiwat(&rpctask_pool, RPCTASKPOOL_HWM);
pool_init(&rpcclnt_pool, sizeof(struct rpcclnt), 0, 0, 1, "rpcclnt_p", NULL);
/* initialize timers */
timeout_set(&rpcclnt_timer_to, rpcclnt_timer, &rpcclnt_timer_to);
rpcclnt_timer(&rpcclnt_timer_to);
#else /* !__OpenBSD__ */
callout_init(&rpcclnt_callout, 0);
#endif /* !__OpenBSD__ */
RPCDEBUG("rpc initialed");
return;
}
void
rpcclnt_uninit(void)
{
RPCDEBUG("uninit");
/* XXX delete sysctl variables? */
callout_stop(&rpcclnt_callout);
}
int
rpcclnt_setup(clnt, program, addr, sotype, soproto, auth, max_read_size, max_write_size, flags)
struct rpcclnt * clnt;
struct rpc_program * program;
struct sockaddr * addr;
int sotype;
int soproto;
struct rpc_auth * auth;
int max_read_size;
int max_write_size;
int flags;
{
if (clnt == NULL || program == NULL || addr == NULL || auth == NULL)
RPC_RETURN (EFAULT);
if (program->prog_name == NULL)
RPC_RETURN (EFAULT);
clnt->rc_prog = program;
clnt->rc_name = addr;
clnt->rc_sotype = sotype;
clnt->rc_soproto = soproto;
clnt->rc_auth = auth;
clnt->rc_rsize = max_read_size;
clnt->rc_wsize = max_write_size;
clnt->rc_flag = flags;
clnt->rc_proctlen = 0;
clnt->rc_proct = NULL;
RPC_RETURN (0);
}
/*
* Initialize sockets and congestion for a new RPC connection. We do not free
* the sockaddr if error.
*/
int
rpcclnt_connect(rpc, td)
struct rpcclnt *rpc;
RPC_EXEC_CTX td;
{
struct socket *so;
int s, error, rcvreserve, sndreserve;
struct sockaddr *saddr;
#ifdef __OpenBSD__
struct sockaddr_in *sin;
struct mbuf *m;
#else
struct sockaddr_in sin;
int soarg;
struct sockopt opt;
#endif
if (rpc == NULL) {
RPCDEBUG("no rpcclnt struct!\n");
RPC_RETURN(EFAULT);
}
GIANT_REQUIRED; /* XXX until socket locking done */
/* create the socket */
rpc->rc_so = NULL;
saddr = rpc->rc_name;
error = socreate(saddr->sa_family, &rpc->rc_so, rpc->rc_sotype,
rpc->rc_soproto, td->td_ucred, td);
if (error) {
RPCDEBUG("error %d in socreate()", error);
RPC_RETURN(error);
}
so = rpc->rc_so;
rpc->rc_soflags = so->so_proto->pr_flags;
/*
* Some servers require that the client port be a reserved port
* number. We always allocate a reserved port, as this prevents
* filehandle disclosure through UDP port capture.
*/
if (saddr->sa_family == AF_INET) {
#ifdef __OpenBSD__
struct mbuf *mopt;
int *ip;
#endif
#ifdef __OpenBSD__
MGET(mopt, M_TRYWAIT, MT_SOOPTS);
mopt->m_len = sizeof(int);
ip = mtod(mopt, int *);
*ip = IP_PORTRANGE_LOW;
error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt);
#else
soarg = IP_PORTRANGE_LOW;
bzero(&opt, sizeof(struct sockopt));
opt.sopt_dir = SOPT_SET;
opt.sopt_level = IPPROTO_IP;
opt.sopt_name = IP_PORTRANGE;
opt.sopt_val = &soarg;
opt.sopt_valsize = sizeof(soarg);
error = sosetopt(so, &opt);
#endif
if (error)
goto bad;
#ifdef __OpenBSD__
MGET(m, M_TRYWAIT, MT_SONAME);
sin = mtod(m, struct sockaddr_in *);
sin->sin_len = m->m_len = sizeof(struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_ANY;
sin->sin_port = htons(0);
error = sobind(so, m);
m_freem(m);
#else
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons(0);
/*
* &thread0 gives us root credentials to ensure sobind
* will give us a reserved ephemeral port.
*/
error = sobind(so, (struct sockaddr *) & sin, &thread0);
#endif
if (error)
goto bad;
#ifdef __OpenBSD__
MGET(mopt, M_TRYWAIT, MT_SOOPTS);
mopt->m_len = sizeof(int);
ip = mtod(mopt, int *);
*ip = IP_PORTRANGE_DEFAULT;
error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt);
#else
soarg = IP_PORTRANGE_DEFAULT;
bzero(&opt, sizeof(struct sockopt));
opt.sopt_dir = SOPT_SET;
opt.sopt_level = IPPROTO_IP;
opt.sopt_name = IP_PORTRANGE;
opt.sopt_val = &soarg;
opt.sopt_valsize = sizeof(soarg);
error = sosetopt(so, &opt);
#endif
if (error)
goto bad;
}
/*
* Protocols that do not require connections may be optionally left
* unconnected for servers that reply from a port other than
* NFS_PORT.
*/
if (rpc->rc_flag & RPCCLNT_NOCONN) {
if (rpc->rc_soflags & PR_CONNREQUIRED) {
error = ENOTCONN;
goto bad;
}
} else {
error = soconnect(so, saddr, td);
if (error)
goto bad;
/*
* Wait for the connection to complete. Cribbed from the
* connect system call but with the wait timing out so that
* interruptible mounts don't hang here for a long time.
*/
#ifdef __OpenBSD__
s = splsoftnet();
#else
s = splnet();
#endif
while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
(void)tsleep((caddr_t) & so->so_timeo, PSOCK,
"rpc", 2 * hz);
/*
* XXX needs to catch interrupt signals. something
* like this: if ((so->so_state & SS_ISCONNECTING) &&
* so->so_error == 0 && rep && (error =
* nfs_sigintr(nmp, rep, rep->r_td)) != 0) {
* so->so_state &= ~SS_ISCONNECTING; splx(s); goto
* bad; }
*/
}
if (so->so_error) {
error = so->so_error;
so->so_error = 0;
splx(s);
goto bad;
}
splx(s);
}
if (rpc->rc_flag & (RPCCLNT_SOFT | RPCCLNT_INT)) {
so->so_rcv.sb_timeo = (5 * hz);
so->so_snd.sb_timeo = (5 * hz);
} else {
so->so_rcv.sb_timeo = 0;
so->so_snd.sb_timeo = 0;
}
if (rpc->rc_sotype == SOCK_DGRAM) {
sndreserve = rpc->rc_wsize + RPC_MAXPKTHDR;
rcvreserve = rpc->rc_rsize + RPC_MAXPKTHDR;
} else if (rpc->rc_sotype == SOCK_SEQPACKET) {
sndreserve = (rpc->rc_wsize + RPC_MAXPKTHDR) * 2;
rcvreserve = (rpc->rc_rsize + RPC_MAXPKTHDR) * 2;
} else {
if (rpc->rc_sotype != SOCK_STREAM)
panic("rpcclnt_connect() bad sotype");
if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
#ifdef __OpenBSD__
MGET(m, M_TRYWAIT, MT_SOOPTS);
*mtod(m, int32_t *) = 1;
m->m_len = sizeof(int32_t);
sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m);
#else
soarg = 1;
bzero(&opt, sizeof(struct sockopt));
opt.sopt_dir = SOPT_SET;
opt.sopt_level = SOL_SOCKET;
opt.sopt_name = SO_KEEPALIVE;
opt.sopt_val = &soarg;
opt.sopt_valsize = sizeof(soarg);
sosetopt(so, &opt);
#endif
}
if (so->so_proto->pr_protocol == IPPROTO_TCP) {
#ifdef __OpenBSD__
MGET(m, M_TRYWAIT, MT_SOOPTS);
*mtod(m, int32_t *) = 1;
m->m_len = sizeof(int32_t);
sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m);
#else
soarg = 1;
bzero(&opt, sizeof(struct sockopt));
opt.sopt_dir = SOPT_SET;
opt.sopt_level = IPPROTO_TCP;
opt.sopt_name = TCP_NODELAY;
opt.sopt_val = &soarg;
opt.sopt_valsize = sizeof(soarg);
sosetopt(so, &opt);
#endif
}
sndreserve = (rpc->rc_wsize + RPC_MAXPKTHDR +
sizeof(u_int32_t)) * 2;
rcvreserve = (rpc->rc_rsize + RPC_MAXPKTHDR +
sizeof(u_int32_t)) * 2;
}
error = soreserve(so, sndreserve, rcvreserve);
if (error)
goto bad;
so->so_rcv.sb_flags |= SB_NOINTR;
so->so_snd.sb_flags |= SB_NOINTR;
/* Initialize other non-zero congestion variables */
rpc->rc_srtt[0] = rpc->rc_srtt[1] = rpc->rc_srtt[2] =
rpc->rc_srtt[3] = (RPC_TIMEO << 3);
rpc->rc_sdrtt[0] = rpc->rc_sdrtt[1] = rpc->rc_sdrtt[2] =
rpc->rc_sdrtt[3] = 0;
rpc->rc_cwnd = RPC_MAXCWND / 2; /* Initial send window */
rpc->rc_sent = 0;
rpc->rc_timeouts = 0;
RPC_RETURN(0);
bad:
rpcclnt_disconnect(rpc);
RPC_RETURN(error);
}
/*
* Reconnect routine:
* Called when a connection is broken on a reliable protocol.
* - clean up the old socket
* - rpcclnt_connect() again
* - set R_MUSTRESEND for all outstanding requests on mount point
* If this fails the mount point is DEAD!
* nb: Must be called with the rpcclnt_sndlock() set on the mount point.
*/
int
rpcclnt_reconnect(rep, td)
struct rpctask *rep;
RPC_EXEC_CTX td;
{
struct rpctask *rp;
struct rpcclnt *rpc = rep->r_rpcclnt;
int error;
rpcclnt_disconnect(rpc);
while ((error = rpcclnt_connect(rpc, td)) != 0) {
if (error == EINTR || error == ERESTART)
RPC_RETURN(EINTR);
tsleep(&lbolt, PSOCK, "rpccon", 0);
}
/*
* Loop through outstanding request list and fix up all requests on
* old socket.
*/
for (rp = TAILQ_FIRST(&rpctask_q); rp != NULL;
rp = TAILQ_NEXT(rp, r_chain)) {
if (rp->r_rpcclnt == rpc)
rp->r_flags |= R_MUSTRESEND;
}
RPC_RETURN(0);
}
/*
* RPC transport disconnect. Clean up and unlink.
*/
void
rpcclnt_disconnect(rpc)
struct rpcclnt *rpc;
{
struct socket *so;
GIANT_REQUIRED; /* XXX until socket locking done */
if (rpc->rc_so) {
so = rpc->rc_so;
rpc->rc_so = NULL;
soshutdown(so, 2);
soclose(so);
}
}
void
rpcclnt_safedisconnect(struct rpcclnt * rpc)
{
struct rpctask dummytask;
bzero(&dummytask, sizeof(dummytask));
dummytask.r_rpcclnt = rpc;
rpcclnt_rcvlock(&dummytask);
rpcclnt_disconnect(rpc);
rpcclnt_rcvunlock(&rpc->rc_flag);
}
/*
* This is the rpc send routine. For connection based socket types, it
* must be called with an rpcclnt_sndlock() on the socket.
* "rep == NULL" indicates that it has been called from a server.
* For the client side:
* - return EINTR if the RPC is terminated, 0 otherwise
* - set R_MUSTRESEND if the send fails for any reason
* - do any cleanup required by recoverable socket errors (?)
* For the server side:
* - return EINTR or ERESTART if interrupted by a signal
* - return EPIPE if a connection is lost for connection based sockets (TCP...)
* - do any cleanup required by recoverable socket errors (?)
*/
static int
rpcclnt_send(so, nam, top, rep)
struct socket *so;
#ifdef __OpenBSD__
struct mbuf *nam;
#else
struct sockaddr *nam;
#endif
struct mbuf *top;
struct rpctask *rep;
{
#ifdef __OpenBSD__
struct mbuf *sendnam;
#else
struct sockaddr *sendnam;
struct thread *td = curthread;
#endif
int error, soflags, flags;
GIANT_REQUIRED; /* XXX until socket locking done */
if (rep) {
if (rep->r_flags & R_SOFTTERM) {
m_freem(top);
RPC_RETURN(EINTR);
}
if ((so = rep->r_rpcclnt->rc_so) == NULL) {
rep->r_flags |= R_MUSTRESEND;
m_freem(top);
RPC_RETURN(0);
}
rep->r_flags &= ~R_MUSTRESEND;
soflags = rep->r_rpcclnt->rc_soflags;
} else
soflags = so->so_proto->pr_flags;
if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
sendnam = NULL;
else
sendnam = nam;
if (so->so_type == SOCK_SEQPACKET)
flags = MSG_EOR;
else
flags = 0;
error = sosend(so, sendnam, NULL, top, NULL, flags, td);
if (error) {
if (rep) {
log(LOG_INFO, "rpc send error %d for service %s\n", error,
rep->r_rpcclnt->rc_prog->prog_name);
/*
* Deal with errors for the client side.
*/
if (rep->r_flags & R_SOFTTERM)
error = EINTR;
else
rep->r_flags |= R_MUSTRESEND;
} else
log(LOG_INFO, "rpc service send error %d\n", error);
/*
* Handle any recoverable (soft) socket errors here.
*/
if (error != EINTR && error != ERESTART &&
error != EWOULDBLOCK && error != EPIPE)
error = 0;
}
RPC_RETURN(error);
}
/*
* Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all done by
* soreceive(), but for SOCK_STREAM we must deal with the Record Mark and
* consolidate the data into a new mbuf list. nb: Sometimes TCP passes the
* data up to soreceive() in long lists of small mbufs. For SOCK_STREAM we
* must be very careful to read an entire record once we have read any of it,
* even if the system call has been interrupted.
*/
static int
rpcclnt_receive(rep, aname, mp, td)
struct rpctask *rep;
#ifdef __OpenBSD__
struct mbuf **aname;
#else
struct sockaddr **aname;
#endif
struct mbuf **mp;
RPC_EXEC_CTX td;
{
struct socket *so;
struct uio auio;
struct iovec aio;
struct mbuf *m;
struct mbuf *control;
u_int32_t len;
#ifdef __OpenBSD__
struct mbuf **getnam;
#else
struct sockaddr **getnam;
#endif
int error, sotype, rcvflg;
GIANT_REQUIRED; /* XXX until socket locking done */
/*
* Set up arguments for soreceive()
*/
*mp = NULL;
*aname = NULL;
sotype = rep->r_rpcclnt->rc_sotype;
/*
* For reliable protocols, lock against other senders/receivers in
* case a reconnect is necessary. For SOCK_STREAM, first get the
* Record Mark to find out how much more there is to get. We must
* lock the socket against other receivers until we have an entire
* rpc request/reply.
*/
if (sotype != SOCK_DGRAM) {
error = rpcclnt_sndlock(&rep->r_rpcclnt->rc_flag, rep);
if (error)
RPC_RETURN(error);
tryagain:
/*
* Check for fatal errors and resending request.
*/
/*
* Ugh: If a reconnect attempt just happened, rc_so would
* have changed. NULL indicates a failed attempt that has
* essentially shut down this mount point.
*/
if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
rpcclnt_sndunlock(&rep->r_rpcclnt->rc_flag);
RPC_RETURN(EINTR);
}
so = rep->r_rpcclnt->rc_so;
if (!so) {
error = rpcclnt_reconnect(rep, td);
if (error) {
rpcclnt_sndunlock(&rep->r_rpcclnt->rc_flag);
RPC_RETURN(error);
}
goto tryagain;
}
while (rep->r_flags & R_MUSTRESEND) {
m = m_copym(rep->r_mreq, 0, M_COPYALL, M_TRYWAIT);
rpcstats.rpcretries++;
error = rpcclnt_send(so, rep->r_rpcclnt->rc_name, m, rep);
if (error) {
if (error == EINTR || error == ERESTART ||
(error = rpcclnt_reconnect(rep, td)) != 0) {
rpcclnt_sndunlock(&rep->r_rpcclnt->rc_flag);
RPC_RETURN(error);
}
goto tryagain;
}
}
rpcclnt_sndunlock(&rep->r_rpcclnt->rc_flag);
if (sotype == SOCK_STREAM) {
aio.iov_base = (caddr_t) & len;
aio.iov_len = sizeof(u_int32_t);
auio.uio_iov = &aio;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_offset = 0;
auio.uio_resid = sizeof(u_int32_t);
#ifdef __OpenBSD__
auio.uio_procp = td;
#else
auio.uio_td = td;
#endif
do {
rcvflg = MSG_WAITALL;
error = soreceive(so, NULL, &auio, NULL, NULL, &rcvflg);
if (error == EWOULDBLOCK && rep) {
if (rep->r_flags & R_SOFTTERM)
RPC_RETURN(EINTR);
}
} while (error == EWOULDBLOCK);
if (!error && auio.uio_resid > 0) {
log(LOG_INFO,
"short receive (%zu/%zu) from rpc server %s\n",
sizeof(u_int32_t) - auio.uio_resid,
sizeof(u_int32_t),
rep->r_rpcclnt->rc_prog->prog_name);
error = EPIPE;
}
if (error)
goto errout;
len = ntohl(len) & ~0x80000000;
/*
* This is SERIOUS! We are out of sync with the
* sender and forcing a disconnect/reconnect is all I
* can do.
*/
if (len > RPC_MAXPACKET) {
log(LOG_ERR, "%s (%d) from rpc server %s\n",
"impossible packet length",
len,
rep->r_rpcclnt->rc_prog->prog_name);
error = EFBIG;
goto errout;
}
auio.uio_resid = len;
do {
rcvflg = MSG_WAITALL;
error = soreceive(so, NULL, &auio, mp, NULL, &rcvflg);
} while (error == EWOULDBLOCK || error == EINTR ||
error == ERESTART);
if (!error && auio.uio_resid > 0) {
log(LOG_INFO,
"short receive (%d/%d) from rpc server %s\n",
len - auio.uio_resid, len,
rep->r_rpcclnt->rc_prog->prog_name);
error = EPIPE;
}
} else {
/*
* NB: Since uio_resid is big, MSG_WAITALL is ignored
* and soreceive() will return when it has either a
* control msg or a data msg. We have no use for
* control msg., but must grab them and then throw
* them away so we know what is going on.
*/
auio.uio_resid = len = 100000000; /* Anything Big */
#ifdef __OpenBSD__
auio.uio_procp = td;
#else
auio.uio_td = td;
#endif
do {
rcvflg = 0;
error = soreceive(so, NULL, &auio, mp, &control, &rcvflg);
if (control)
m_freem(control);
if (error == EWOULDBLOCK && rep) {
if (rep->r_flags & R_SOFTTERM)
RPC_RETURN(EINTR);
}
} while (error == EWOULDBLOCK ||
(!error && *mp == NULL && control));
if ((rcvflg & MSG_EOR) == 0)
printf("Egad!!\n");
if (!error && *mp == NULL)
error = EPIPE;
len -= auio.uio_resid;
}
errout:
if (error && error != EINTR && error != ERESTART) {
m_freem(*mp);
*mp = (struct mbuf *) 0;
if (error != EPIPE)
log(LOG_INFO,
"receive error %d from rpc server %s\n",
error,
rep->r_rpcclnt->rc_prog->prog_name);
error = rpcclnt_sndlock(&rep->r_rpcclnt->rc_flag, rep);
if (!error)
error = rpcclnt_reconnect(rep, td);
if (!error)
goto tryagain;
}
} else {
if ((so = rep->r_rpcclnt->rc_so) == NULL)
RPC_RETURN(EACCES);
if (so->so_state & SS_ISCONNECTED)
getnam = NULL;
else
getnam = aname;
auio.uio_resid = len = 1000000;
#ifdef __OpenBSD__
auio.uio_procp = td;
#else
auio.uio_td = td;
#endif
do {
rcvflg = 0;
error = soreceive(so, getnam, &auio, mp, NULL, &rcvflg);
RPCDEBUG("soreceivce returns %d", error);
if (error == EWOULDBLOCK && (rep->r_flags & R_SOFTTERM)) {
RPCDEBUG("wouldblock && softerm -> EINTR");
RPC_RETURN(EINTR);
}
} while (error == EWOULDBLOCK);
len -= auio.uio_resid;
}
if (error) {
m_freem(*mp);
*mp = NULL;
} else {
/*
* Search for any mbufs that are not a multiple of 4 bytes
* long or with m_data not longword aligned. These could
* cause pointer alignment problems, so copy them to well
* aligned mbufs.
*/
rpcclnt_realign(mp, 5 * RPCX_UNSIGNED);
}
RPC_RETURN(error);
}
/*
* Implement receipt of reply on a socket. We must search through the list of
* received datagrams matching them with outstanding requests using the xid,
* until ours is found.
*/
/* ARGSUSED */
static int
rpcclnt_reply(myrep, td)
struct rpctask *myrep;
RPC_EXEC_CTX td;
{
struct rpctask *rep;
struct rpcclnt *rpc = myrep->r_rpcclnt;
int32_t t1;
struct mbuf *mrep, *md;
#ifdef __OpenBSD__
struct mbuf *nam;
#else
struct sockaddr *nam;
#endif
u_int32_t rxid, *tl;
caddr_t dpos, cp2;
int error;
/*
* Loop around until we get our own reply
*/
for (;;) {
/*
* Lock against other receivers so that I don't get stuck in
* sbwait() after someone else has received my reply for me.
* Also necessary for connection based protocols to avoid
* race conditions during a reconnect.
*/
error = rpcclnt_rcvlock(myrep);
if (error)
RPC_RETURN(error);
/* Already received, bye bye */
if (myrep->r_mrep != NULL) {
rpcclnt_rcvunlock(&rpc->rc_flag);
RPC_RETURN(0);
}
/*
* Get the next Rpc reply off the socket
*/
error = rpcclnt_receive(myrep, &nam, &mrep, td);
rpcclnt_rcvunlock(&rpc->rc_flag);
if (error) {
/*
* Ignore routing errors on connectionless
* protocols??
*/
if (RPCIGNORE_SOERROR(rpc->rc_soflags, error)) {
rpc->rc_so->so_error = 0;
if (myrep->r_flags & R_GETONEREP)
RPC_RETURN(0);
RPCDEBUG("ingoring routing error on connectionless protocol.");
continue;
}
RPC_RETURN(error);
}
#ifdef __OpenBSD__
if (nam)
m_freem(nam);
#else
if (nam)
FREE(nam, M_SONAME);
#endif
/*
* Get the xid and check that it is an rpc reply
*/
md = mrep;
dpos = mtod(md, caddr_t);
rpcm_dissect(tl, u_int32_t *, 2 * RPCX_UNSIGNED);
rxid = *tl++;
if (*tl != rpc_reply) {
rpcstats.rpcinvalid++;
m_freem(mrep);
rpcmout:
if (myrep->r_flags & R_GETONEREP)
RPC_RETURN(0);
continue;
}
/*
* Loop through the request list to match up the reply Iff no
* match, just drop the datagram
*/
TAILQ_FOREACH(rep, &rpctask_q, r_chain) {
if (rep->r_mrep == NULL && rxid == rep->r_xid) {
/* Found it.. */
rep->r_mrep = mrep;
rep->r_md = md;
rep->r_dpos = dpos;
/*
* Update congestion window. Do the additive
* increase of one rpc/rtt.
*/
if (rpc->rc_cwnd <= rpc->rc_sent) {
rpc->rc_cwnd +=
(RPC_CWNDSCALE * RPC_CWNDSCALE +
(rpc->rc_cwnd >> 1)) / rpc->rc_cwnd;
if (rpc->rc_cwnd > RPC_MAXCWND)
rpc->rc_cwnd = RPC_MAXCWND;
}
rep->r_flags &= ~R_SENT;
rpc->rc_sent -= RPC_CWNDSCALE;
/*
* Update rtt using a gain of 0.125 on the
* mean and a gain of 0.25 on the deviation.
*/
if (rep->r_flags & R_TIMING) {
/*
* Since the timer resolution of
* NFS_HZ is so course, it can often
* result in r_rtt == 0. Since r_rtt
* == N means that the actual rtt is
* between N+dt and N+2-dt ticks, add
* 1.
*/
t1 = rep->r_rtt + 1;
t1 -= (RPC_SRTT(rpc, rep) >> 3);
RPC_SRTT(rpc, rep) += t1;
if (t1 < 0)
t1 = -t1;
t1 -= (RPC_SDRTT(rpc, rep) >> 2);
RPC_SDRTT(rpc, rep) += t1;
}
rpc->rc_timeouts = 0;
break;
}
}
/*
* If not matched to a request, drop it. If it's mine, get
* out.
*/
if (rep == 0) {
rpcstats.rpcunexpected++;
RPCDEBUG("rpc reply not matched\n");
m_freem(mrep);
} else if (rep == myrep) {
if (rep->r_mrep == NULL)
panic("rpcreply nil");
RPC_RETURN(0);
}
if (myrep->r_flags & R_GETONEREP)
RPC_RETURN(0);
}
}
/* XXX: ignores tryagain! */
/*
* code from nfs_request - goes something like this
* - fill in task struct
* - links task into list
* - calls rpcclnt_send() for first transmit
* - calls rpcclnt_reply() to get reply
* - fills in reply (which should be initialized prior to
* calling), which is valid when 0 is returned and is
* NEVER freed in this function
*
* nb: always frees the request header, but NEVER frees 'mrest'
*
* rpcclnt_setauth() should be used before calling this. EAUTH is returned if
* authentication fails.
*
* note that reply->result_* are invalid unless reply->type ==
* RPC_MSGACCEPTED and reply->status == RPC_SUCCESS and that reply->verf_*
* are invalid unless reply->type == RPC_MSGACCEPTED
*/
int
rpcclnt_request(rpc, mrest, procnum, td, cred, reply)
struct rpcclnt *rpc;
struct mbuf *mrest;
int procnum;
RPC_EXEC_CTX td;
struct ucred *cred;
struct rpc_reply *reply;
{
struct mbuf *m, *mrep;
struct rpctask *task;
u_int32_t *tl;
struct mbuf *md, *mheadend;
caddr_t dpos, cp2;
int t1, s, error = 0, mrest_len;
u_int32_t xid;
#ifdef __OpenBSD__
task = pool_get(&rpctask_pool, PR_WAITOK);
#else
MALLOC(task, struct rpctask *, sizeof(struct rpctask), M_RPC, (M_WAITOK | M_ZERO));
#endif
task->r_rpcclnt = rpc;
task->r_procnum = procnum;
task->r_td = td;
mrest_len = m_length(mrest, NULL);
m = rpcclnt_buildheader(rpc, procnum, mrest, mrest_len, &xid, &mheadend,
cred);
/*
* For stream protocols, insert a Sun RPC Record Mark.
*/
if (rpc->rc_sotype == SOCK_STREAM) {
M_PREPEND(m, RPCX_UNSIGNED, M_TRYWAIT);
*mtod(m, u_int32_t *) = htonl(0x80000000 |
(m->m_pkthdr.len - RPCX_UNSIGNED));
}
task->r_mreq = m;
task->r_xid = xid;
if (rpc->rc_flag & RPCCLNT_SOFT)
task->r_retry = rpc->rc_retry;
else
task->r_retry = RPC_MAXREXMIT + 1; /* past clip limit */
task->r_rtt = task->r_rexmit = 0;
if (rpcclnt_proct(rpc, procnum) > 0)
task->r_flags = R_TIMING;
else
task->r_flags = 0;
task->r_mrep = NULL;
/*
* Do the client side RPC.
*/
rpcstats.rpcrequests++;
/*
* Chain request into list of outstanding requests. Be sure to put it
* LAST so timer finds oldest requests first.
*/
s = splsoftclock();
if (TAILQ_EMPTY(&rpctask_q))
callout_reset(&rpcclnt_callout, rpcclnt_ticks, rpcclnt_timer,
NULL);
TAILQ_INSERT_TAIL(&rpctask_q, task, r_chain);
/*
* If backing off another request or avoiding congestion, don't send
* this one now but let timer do it. If not timing a request, do it
* now.
*/
if (rpc->rc_so && (rpc->rc_sotype != SOCK_DGRAM ||
(rpc->rc_flag & RPCCLNT_DUMBTIMR) ||
rpc->rc_sent < rpc->rc_cwnd)) {
splx(s);
if (rpc->rc_soflags & PR_CONNREQUIRED)
error = rpcclnt_sndlock(&rpc->rc_flag, task);
if (!error) {
error = rpcclnt_send(rpc->rc_so, rpc->rc_name,
m_copym(m, 0, M_COPYALL, M_TRYWAIT),
task);
if (rpc->rc_soflags & PR_CONNREQUIRED)
rpcclnt_sndunlock(&rpc->rc_flag);
}
if (!error && (task->r_flags & R_MUSTRESEND) == 0) {
rpc->rc_sent += RPC_CWNDSCALE;
task->r_flags |= R_SENT;
}
} else {
splx(s);
task->r_rtt = -1;
}
/*
* Wait for the reply from our send or the timer's.
*/
if (!error || error == EPIPE)
error = rpcclnt_reply(task, td);
/*
* RPC done, unlink the request.
*/
s = splsoftclock();
TAILQ_REMOVE(&rpctask_q, task, r_chain);
if (TAILQ_EMPTY(&rpctask_q))
callout_stop(&rpcclnt_callout);
splx(s);
/*
* Decrement the outstanding request count.
*/
if (task->r_flags & R_SENT) {
task->r_flags &= ~R_SENT; /* paranoia */
rpc->rc_sent -= RPC_CWNDSCALE;
}
/*
* If there was a successful reply and a tprintf msg. tprintf a
* response.
*/
if (!error && (task->r_flags & R_TPRINTFMSG)) {
mtx_lock(&Giant);
rpcclnt_msg(task->r_td, rpc->rc_prog->prog_name,
"is alive again");
mtx_unlock(&Giant);
}
/* free request header (leaving mrest) */
mheadend->m_next = NULL;
m_freem(task->r_mreq);
/* initialize reply */
reply->mrep = task->r_mrep;
reply->verf_md = NULL;
reply->result_md = NULL;
mrep = task->r_mrep;
md = task->r_md;
dpos = task->r_dpos;
/* task structure is no longer needed */
#ifdef __OpenBSD__
pool_put(&rpctask_pool, task);
#else
FREE(task, M_RPC);
#endif
if (error)
goto rpcmout;
/*
* break down the rpc header and check if ok
*/
rpcm_dissect(tl, u_int32_t *, RPCX_UNSIGNED);
reply->stat.type = fxdr_unsigned(u_int32_t, *tl);
if (reply->stat.type == RPC_MSGDENIED) {
rpcm_dissect(tl, u_int32_t *, RPCX_UNSIGNED);
reply->stat.status = fxdr_unsigned(u_int32_t, *tl);
switch (reply->stat.status) {
case RPC_MISMATCH:
rpcm_dissect(tl, u_int32_t *, 2 * RPCX_UNSIGNED);
reply->stat.mismatch_info.low = fxdr_unsigned(u_int32_t, *tl++);
reply->stat.mismatch_info.high = fxdr_unsigned(u_int32_t, *tl);
error = EOPNOTSUPP;
break;
case RPC_AUTHERR:
rpcm_dissect(tl, u_int32_t *, RPCX_UNSIGNED);
reply->stat.autherr = fxdr_unsigned(u_int32_t, *tl);
error = EACCES;
break;
default:
error = EBADRPC;
break;
}
goto rpcmout;
} else if (reply->stat.type != RPC_MSGACCEPTED) {
error = EBADRPC;
goto rpcmout;
}
rpcm_dissect(tl, u_int32_t *, 2 * RPCX_UNSIGNED);
reply->verf_md = md;
reply->verf_dpos = dpos;
reply->verf_type = fxdr_unsigned(u_int32_t, *tl++);
reply->verf_size = fxdr_unsigned(u_int32_t, *tl);
if (reply->verf_size != 0)
rpcm_adv(rpcm_rndup(reply->verf_size));
rpcm_dissect(tl, u_int32_t *, RPCX_UNSIGNED);
reply->stat.status = fxdr_unsigned(u_int32_t, *tl);
if (reply->stat.status == RPC_SUCCESS) {
if ((uint32_t)(dpos - mtod(md, caddr_t)) >= md->m_len) {
RPCDEBUG("where is the next mbuf?");
RPCDEBUG("%d -> %d",
(int)(dpos - mtod(md, caddr_t)), md->m_len);
if (md->m_next == NULL) {
error = EBADRPC;
goto rpcmout;
} else {
reply->result_md = md->m_next;
reply->result_dpos = mtod(reply->result_md,
caddr_t);
}
} else {
reply->result_md = md;
reply->result_dpos = dpos;
}
} else if (reply->stat.status == RPC_PROGMISMATCH) {
rpcm_dissect(tl, u_int32_t *, 2 * RPCX_UNSIGNED);
reply->stat.mismatch_info.low = fxdr_unsigned(u_int32_t, *tl++);
reply->stat.mismatch_info.high = fxdr_unsigned(u_int32_t, *tl);
error = EOPNOTSUPP;
goto rpcmout;
} else {
error = EPROTONOSUPPORT;
goto rpcmout;
}
error = 0;
rpcmout:
RPC_RETURN(error);
}
/*
* RPC timer routine
* Scan the rpctask list and retranmit any requests that have timed out.
* To avoid retransmission attempts on STREAM sockets (in the future) make
* sure to set the r_retry field to 0 (implies nm_retry == 0).
*/
void
rpcclnt_timer(arg)
void *arg;
{
#ifdef __OpenBSD__
struct timeout *to = (struct timeout *) arg;
#endif
struct rpctask *rep;
struct mbuf *m;
struct socket *so;
struct rpcclnt *rpc;
int timeo;
int s, error;
#ifndef __OpenBSD__
struct thread *td = curthread;
#endif
#ifdef __OpenBSD__
s = splsoftnet();
#else
s = splnet();
#endif
mtx_lock(&Giant); /* rpc_msg -> tprintf */
TAILQ_FOREACH(rep, &rpctask_q, r_chain) {
rpc = rep->r_rpcclnt;
if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
continue;
if (rpcclnt_sigintr(rpc, rep, rep->r_td)) {
rep->r_flags |= R_SOFTTERM;
continue;
}
if (rep->r_rtt >= 0) {
rep->r_rtt++;
if (rpc->rc_flag & RPCCLNT_DUMBTIMR)
timeo = rpc->rc_timeo;
else
timeo = RPC_RTO(rpc, rpcclnt_proct(rep->r_rpcclnt,
rep->r_procnum));
if (rpc->rc_timeouts > 0)
timeo *= rpcclnt_backoff[rpc->rc_timeouts - 1];
if (rep->r_rtt <= timeo)
continue;
if (rpc->rc_timeouts < 8)
rpc->rc_timeouts++;
}
/*
* Check for server not responding
*/
if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
rep->r_rexmit > rpc->rc_deadthresh) {
rpcclnt_msg(rep->r_td, rpc->rc_prog->prog_name,
"not responding");
rep->r_flags |= R_TPRINTFMSG;
}
if (rep->r_rexmit >= rep->r_retry) { /* too many */
rpcstats.rpctimeouts++;
rep->r_flags |= R_SOFTTERM;
continue;
}
if (rpc->rc_sotype != SOCK_DGRAM) {
if (++rep->r_rexmit > RPC_MAXREXMIT)
rep->r_rexmit = RPC_MAXREXMIT;
continue;
}
if ((so = rpc->rc_so) == NULL)
continue;
/*
* If there is enough space and the window allows.. Resend it
* Set r_rtt to -1 in case we fail to send it now.
*/
rep->r_rtt = -1;
if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
((rpc->rc_flag & RPCCLNT_DUMBTIMR) ||
(rep->r_flags & R_SENT) ||
rpc->rc_sent < rpc->rc_cwnd) &&
(m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))) {
if ((rpc->rc_flag & RPCCLNT_NOCONN) == 0)
error = (*so->so_proto->pr_usrreqs->pru_send) (so, 0, m,
NULL, NULL, td);
else
error = (*so->so_proto->pr_usrreqs->pru_send)(so, 0, m, rpc->rc_name, NULL, td);
if (error) {
if (RPCIGNORE_SOERROR(rpc->rc_soflags, error))
so->so_error = 0;
} else {
/*
* Iff first send, start timing else turn
* timing off, backoff timer and divide
* congestion window by 2.
*/
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_TIMING;
if (++rep->r_rexmit > RPC_MAXREXMIT)
rep->r_rexmit = RPC_MAXREXMIT;
rpc->rc_cwnd >>= 1;
if (rpc->rc_cwnd < RPC_CWNDSCALE)
rpc->rc_cwnd = RPC_CWNDSCALE;
rpcstats.rpcretries++;
} else {
rep->r_flags |= R_SENT;
rpc->rc_sent += RPC_CWNDSCALE;
}
rep->r_rtt = 0;
}
}
}
mtx_unlock(&Giant); /* rpc_msg -> tprintf */
splx(s);
#ifdef __OpenBSD__
timeout_add(rpcclnt_timer, to, rpcclnt_ticks);
#else
callout_reset(&rpcclnt_callout, rpcclnt_ticks, rpcclnt_timer, NULL);
#endif
}
/*
* Test for a termination condition pending on the process. This is used for
* RPCCLNT_INT mounts.
*/
int
rpcclnt_sigintr(rpc, task, pr)
struct rpcclnt *rpc;
struct rpctask *task;
RPC_EXEC_CTX pr;
{
struct proc *p;
sigset_t tmpset;
if (rpc == NULL)
return EFAULT;
/* XXX deal with forced unmounts */
if (task && (task->r_flags & R_SOFTTERM))
RPC_RETURN(EINTR);
if (!(rpc->rc_flag & RPCCLNT_INT))
RPC_RETURN(0);
if (pr == NULL)
return (0);
#ifdef __OpenBSD__
p = pr;
if (p && p->p_siglist &&
(((p->p_siglist & ~p->p_sigmask) & ~p->p_sigignore) &
RPCINT_SIGMASK))
RPC_RETURN(EINTR);
#else
p = pr->td_proc;
PROC_LOCK(p);
tmpset = p->p_siglist;
SIGSETNAND(tmpset, pr->td_sigmask);
mtx_lock(&p->p_sigacts->ps_mtx);
SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
mtx_unlock(&p->p_sigacts->ps_mtx);
if (SIGNOTEMPTY(p->p_siglist) && RPCCLNTINT_SIGMASK(tmpset)) {
PROC_UNLOCK(p);
RPC_RETURN(EINTR);
}
PROC_UNLOCK(p);
#endif
RPC_RETURN(0);
}
/*
* Lock a socket against others. Necessary for STREAM sockets to ensure you
* get an entire rpc request/reply and also to avoid race conditions between
* the processes with nfs requests in progress when a reconnect is necessary.
*/
static int
rpcclnt_sndlock(flagp, task)
int *flagp;
struct rpctask *task;
{
RPC_EXEC_CTX p;
int slpflag = 0, slptimeo = 0;
p = task->r_td;
if (task->r_rpcclnt->rc_flag & RPCCLNT_INT)
slpflag = PCATCH;
while (*flagp & RPCCLNT_SNDLOCK) {
if (rpcclnt_sigintr(task->r_rpcclnt, task, p))
RPC_RETURN(EINTR);
*flagp |= RPCCLNT_WANTSND;
(void)tsleep((caddr_t) flagp, slpflag | (PZERO - 1), "rpcsndlck",
slptimeo);
if (slpflag == PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
}
*flagp |= RPCCLNT_SNDLOCK;
RPC_RETURN(0);
}
/*
* Unlock the stream socket for others.
*/
static void
rpcclnt_sndunlock(flagp)
int *flagp;
{
if ((*flagp & RPCCLNT_SNDLOCK) == 0)
panic("rpc sndunlock");
*flagp &= ~RPCCLNT_SNDLOCK;
if (*flagp & RPCCLNT_WANTSND) {
*flagp &= ~RPCCLNT_WANTSND;
wakeup((caddr_t) flagp);
}
}
static int
rpcclnt_rcvlock(task)
struct rpctask *task;
{
int *flagp = &task->r_rpcclnt->rc_flag;
int slpflag, slptimeo = 0;
if (*flagp & RPCCLNT_INT)
slpflag = PCATCH;
else
slpflag = 0;
while (*flagp & RPCCLNT_RCVLOCK) {
if (rpcclnt_sigintr(task->r_rpcclnt, task, task->r_td))
RPC_RETURN(EINTR);
*flagp |= RPCCLNT_WANTRCV;
(void)tsleep((caddr_t) flagp, slpflag | (PZERO - 1), "rpcrcvlk",
slptimeo);
if (slpflag == PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
}
*flagp |= RPCCLNT_RCVLOCK;
RPC_RETURN(0);
}
/*
* Unlock the stream socket for others.
*/
static void
rpcclnt_rcvunlock(flagp)
int *flagp;
{
if ((*flagp & RPCCLNT_RCVLOCK) == 0)
panic("nfs rcvunlock");
*flagp &= ~RPCCLNT_RCVLOCK;
if (*flagp & RPCCLNT_WANTRCV) {
*flagp &= ~RPCCLNT_WANTRCV;
wakeup((caddr_t) flagp);
}
}
#if 0
/*
* Check for badly aligned mbuf data areas and realign data in an mbuf list
* by copying the data areas up, as required.
*/
void
rpcclnt_realign(m, hsiz)
struct mbuf *m;
int hsiz;
{
struct mbuf *m2;
int siz, mlen, olen;
caddr_t tcp, fcp;
struct mbuf *mnew;
while (m) {
/*
* This never happens for UDP, rarely happens for TCP but
* frequently happens for iso transport.
*/
if ((m->m_len & 0x3) || (mtod(m, long)&0x3)) {
olen = m->m_len;
fcp = mtod(m, caddr_t);
if ((long)fcp & 0x3) {
if (m->m_flags & M_PKTHDR)
m_tag_delete_chain(m, NULL);
m->m_flags &= ~M_PKTHDR;
if (m->m_flags & M_EXT)
m->m_data = m->m_ext.ext_buf +
((m->m_ext.ext_size - olen) & ~0x3);
else
m->m_data = m->m_dat;
}
m->m_len = 0;
tcp = mtod(m, caddr_t);
mnew = m;
m2 = m->m_next;
/*
* If possible, only put the first invariant part of
* the RPC header in the first mbuf.
*/
mlen = M_TRAILINGSPACE(m);
if (olen <= hsiz && mlen > hsiz)
mlen = hsiz;
/* Loop through the mbuf list consolidating data. */
while (m) {
while (olen > 0) {
if (mlen == 0) {
if (m2->m_flags & M_PKTHDR)
m_tag_delete_chain(m2, NULL);
m2->m_flags &= ~M_PKTHDR;
if (m2->m_flags & M_EXT)
m2->m_data = m2->m_ext.ext_buf;
else
m2->m_data = m2->m_dat;
m2->m_len = 0;
mlen = M_TRAILINGSPACE(m2);
tcp = mtod(m2, caddr_t);
mnew = m2;
m2 = m2->m_next;
}
siz = min(mlen, olen);
if (tcp != fcp)
bcopy(fcp, tcp, siz);
mnew->m_len += siz;
mlen -= siz;
olen -= siz;
tcp += siz;
fcp += siz;
}
m = m->m_next;
if (m) {
olen = m->m_len;
fcp = mtod(m, caddr_t);
}
}
/*
* Finally, set m_len == 0 for any trailing mbufs
* that have been copied out of.
*/
while (m2) {
m2->m_len = 0;
m2 = m2->m_next;
}
return;
}
m = m->m_next;
}
}
#else
static void
rpcclnt_realign(struct mbuf **pm, int hsiz)
{
struct mbuf *m;
struct mbuf *n = NULL;
int off = 0;
RPCDEBUG("in rpcclnt_realign()");
while ((m = *pm) != NULL) {
if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
MGET(n, M_TRYWAIT, MT_DATA);
if (m->m_len >= MINCLSIZE) {
MCLGET(n, M_TRYWAIT);
}
n->m_len = 0;
break;
}
pm = &m->m_next;
}
/*
* If n is non-NULL, loop on m copying data, then replace the
* portion of the chain that had to be realigned.
*/
if (n != NULL) {
while (m) {
m_copyback(n, off, m->m_len, mtod(m, caddr_t));
off += m->m_len;
m = m->m_next;
}
m_freem(*pm);
*pm = n;
}
RPCDEBUG("leave rpcclnt_realign()");
}
#endif
static int
rpcclnt_msg(p, server, msg)
RPC_EXEC_CTX p;
const char *server;
char *msg;
{
#ifdef __OpenBSD__
tpr_t tpr;
struct proc *pr = p;
if (p)
tpr = tprintf_open(p);
else
tpr = NULL;
tprintf(tpr, "rpc server %s: %s\n", server, msg);
tprintf_close(tpr);
RPC_RETURN(0);
#else
GIANT_REQUIRED;
tprintf(p ? p->td_proc : NULL, LOG_INFO,
"nfs server %s: %s\n", server, msg);
RPC_RETURN(0);
#endif
}
/*
* Build the RPC header and fill in the authorization info. The authorization
* string argument is only used when the credentials come from outside of the
* kernel (AUTH_KERB). (likewise, the ucred is only used when inside the
* kernel) Returns the head of the mbuf list.
*/
static struct mbuf *
rpcclnt_buildheader(rc, procid, mrest, mrest_len, xidp, mheadend, cred)
struct rpcclnt *rc;
int procid;
struct mbuf *mrest;
u_int32_t mrest_len;
int *xidp;
struct mbuf **mheadend;
struct ucred * cred;
{
/* register */ struct mbuf *mb;
register u_int32_t *tl;
/* register */ caddr_t bpos;
struct mbuf *mreq, *mb2;
int error;
MGETHDR(mb, M_TRYWAIT, MT_DATA);
if (6 * RPCX_UNSIGNED >= MINCLSIZE) {
MCLGET(mb, M_TRYWAIT);
} else if (6 * RPCX_UNSIGNED < MHLEN) {
MH_ALIGN(mb, 6 * RPCX_UNSIGNED);
} else {
RPCDEBUG("mbuf too small");
panic("cheap bailout");
}
mb->m_len = 0;
mreq = mb;
bpos = mtod(mb, caddr_t);
/*
* First the RPC header.
*/
rpcm_build(tl, u_int32_t *, 6 * RPCX_UNSIGNED);
/* Get a new (non-zero) xid */
if ((rpcclnt_xid == 0) && (rpcclnt_xid_touched == 0)) {
rpcclnt_xid = arc4random();
rpcclnt_xid_touched = 1;
} else {
while ((*xidp = arc4random() % 256) == 0);
rpcclnt_xid += *xidp;
}
/* XXX: funky... */
*tl++ = *xidp = txdr_unsigned(rpcclnt_xid);
*tl++ = rpc_call;
*tl++ = rpc_vers;
*tl++ = txdr_unsigned(rc->rc_prog->prog_id);
*tl++ = txdr_unsigned(rc->rc_prog->prog_version);
*tl++ = txdr_unsigned(procid);
if ((error = rpcauth_buildheader(rc->rc_auth, cred, &mb, &bpos))) {
RPCDEBUG("rpcauth_buildheader failed %d", error);
return NULL;
}
mb->m_next = mrest;
*mheadend = mb;
mreq->m_pkthdr.len = m_length(mreq, NULL);
mreq->m_pkthdr.rcvif = NULL;
return (mreq);
}
/*
* Help break down an mbuf chain by setting the first siz bytes contiguous
* pointed to by returned val. This is used by the macros rpcm_dissect and
* rpcm_dissecton for tough cases. (The macros use the vars. dpos and dpos2)
*/
static int
rpcm_disct(mdp, dposp, siz, left, cp2)
struct mbuf **mdp;
caddr_t *dposp;
int siz;
int left;
caddr_t *cp2;
{
struct mbuf *mp, *mp2;
int siz2, xfer;
caddr_t p;
mp = *mdp;
while (left == 0) {
*mdp = mp = mp->m_next;
if (mp == NULL)
RPC_RETURN(EBADRPC);
left = mp->m_len;
*dposp = mtod(mp, caddr_t);
}
if (left >= siz) {
*cp2 = *dposp;
*dposp += siz;
} else if (mp->m_next == NULL) {
RPC_RETURN(EBADRPC);
} else if (siz > MHLEN) {
panic("rpc S too big");
} else {
MGET(mp2, M_TRYWAIT, MT_DATA);
mp2->m_next = mp->m_next;
mp->m_next = mp2;
mp->m_len -= left;
mp = mp2;
*cp2 = p = mtod(mp, caddr_t);
bcopy(*dposp, p, left); /* Copy what was left */
siz2 = siz - left;
p += left;
mp2 = mp->m_next;
/* Loop around copying up the siz2 bytes */
while (siz2 > 0) {
if (mp2 == NULL)
RPC_RETURN(EBADRPC);
xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
if (xfer > 0) {
bcopy(mtod(mp2, caddr_t), p, xfer);
RPCMADV(mp2, xfer);
mp2->m_len -= xfer;
p += xfer;
siz2 -= xfer;
}
if (siz2 > 0)
mp2 = mp2->m_next;
}
mp->m_len = siz;
*mdp = mp2;
*dposp = mtod(mp2, caddr_t);
}
RPC_RETURN(0);
}
static u_int32_t
rpcclnt_proct(rpc, procid)
struct rpcclnt *rpc;
u_int32_t procid;
{
if (rpc->rc_proctlen != 0 && rpc->rc_proct != NULL &&
procid < rpc->rc_proctlen) {
return rpc->rc_proct[procid];
}
return (0);
}
static int
rpc_adv(mdp, dposp, offs, left)
struct mbuf **mdp;
caddr_t *dposp;
int offs;
int left;
{
struct mbuf *m;
int s;
m = *mdp;
s = left;
while (s < offs) {
offs -= s;
m = m->m_next;
if (m == NULL)
RPC_RETURN(EBADRPC);
s = m->m_len;
}
*mdp = m;
*dposp = mtod(m, caddr_t) + offs;
RPC_RETURN(0);
}
int
rpcclnt_cancelreqs(rpc)
struct rpcclnt *rpc;
{
struct rpctask *task;
int i, s;
s = splnet();
TAILQ_FOREACH(task, &rpctask_q, r_chain) {
if (rpc != task->r_rpcclnt || task->r_mrep != NULL ||
(task->r_flags & R_SOFTTERM))
continue;
rpcclnt_softterm(task);
}
splx(s);
for (i = 0; i < 30; i++) {
s = splnet();
TAILQ_FOREACH(task, &rpctask_q, r_chain) {
if (rpc == task->r_rpcclnt)
break;
}
splx(s);
if (task == NULL)
return (0);
tsleep(&lbolt, PSOCK, "nfscancel", 0);
}
return (EBUSY);
}
static void
rpcclnt_softterm(struct rpctask * task)
{
task->r_flags |= R_SOFTTERM;
if (task->r_flags & R_SENT) {
task->r_rpcclnt->rc_sent -= RPC_CWNDSCALE;
task->r_flags &= ~R_SENT;
}
}
#ifndef __OpenBSD__
/* called by rpcclnt_get() */
void
rpcclnt_create(struct rpcclnt ** rpc)
{
MALLOC(*rpc, struct rpcclnt *, sizeof(struct rpcclnt), M_RPC, M_WAITOK | M_ZERO);
}
/* called by rpcclnt_put() */
void
rpcclnt_destroy(struct rpcclnt * rpc)
{
if (rpc != NULL) {
FREE(rpc, M_RPC);
} else {
RPCDEBUG("attempting to free a NULL rpcclnt (not dereferenced)");
}
}
#endif /* !__OpenBSD__ */
/* XXX: add a lock around the auth structure in struct rpcclnt and make this
* call safe for calling durring a connection */
static int
rpcauth_buildheader(struct rpc_auth * auth, struct ucred * cred, struct mbuf ** mhdr, caddr_t * bp)
{
size_t authsiz, verfsiz;
uint32_t mlen, grpsiz;
register struct mbuf *mb, *mb2;
caddr_t bpos;
register u_int32_t *tl;
register int i;
if (auth == NULL || mhdr == NULL)
return EFAULT;
switch (auth->auth_type) {
case RPCAUTH_NULL:
authsiz = 0;
verfsiz = 0;
break;
case RPCAUTH_UNIX:
authsiz = (5 + cred->cr_ngroups) * RPCX_UNSIGNED;
verfsiz = 0;
break;
default:
return EPROTONOSUPPORT;
break;
};
mlen = rpcm_rndup(authsiz) + rpcm_rndup(verfsiz) + 4 * RPCX_UNSIGNED;
mb = *mhdr;
bpos = *bp;
rpcm_build(tl, u_int32_t *, mlen);
*bp = bpos;
*mhdr = mb;
*tl++ = txdr_unsigned(auth->auth_type);
*tl++ = txdr_unsigned(authsiz);
switch (auth->auth_type) {
case RPCAUTH_UNIX:
*tl++ = 0;
*tl++ = 0;
*tl++ = txdr_unsigned(cred->cr_uid);
*tl++ = txdr_unsigned(cred->cr_groups[0]);
grpsiz = cred->cr_ngroups;
*tl++ = txdr_unsigned(grpsiz);
/* XXX: groups[0] is already sent... */
for (i = 0 ; i < grpsiz ; i++) {
*tl++ = txdr_unsigned(cred->cr_groups[i]);
}
/* null verification header */
*tl++ = txdr_unsigned(RPCAUTH_NULL);
*tl++ = 0;
break;
case RPCAUTH_NULL:
/* just a null verf header */
*tl++ = txdr_unsigned(RPCAUTH_NULL);
*tl = 0;
break;
default:
panic("inconsistent rpc auth type");
break;
}
return 0;
}
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