2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
13 #include <afsconfig.h>
14 #include "afs/param.h"
18 #include "afs/sysincludes.h" /* Standard vendor system headers */
21 #if !defined(AFS_LINUX20_ENV)
24 #include <netinet/in.h>
27 #include "h/hashing.h"
29 #if !defined(AFS_HPUX110_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_DARWIN_ENV)
30 #include <netinet/in_var.h>
31 #endif /* ! AFS_HPUX110_ENV */
32 #endif /* !defined(UKERNEL) */
34 #include "afsincludes.h" /* Afs-based standard headers */
35 #include "afs/afs_stats.h" /* afs statistics */
37 #if defined(AFS_SUN5_ENV)
39 #include <inet/common.h>
40 #include <netinet/ip6.h>
44 /* Exported variables */
45 afs_rwlock_t afs_xconn; /* allocation lock for new things */
46 afs_rwlock_t afs_xinterface; /* for multiple client address */
47 afs_int32 cryptall = 1; /* encrypt all communications */
49 /* some connection macros */
52 #define new_conn_vector(xcv) \
54 xcv = (struct sa_conn_vector *) \
55 afs_osi_Alloc(sizeof(struct sa_conn_vector)); \
57 memset((char *)xcv, 0, sizeof(struct sa_conn_vector)); \
61 /* select a connection to return (if no connection has lower utilization
63 #define conn_vec_select_conn(xcv, bix, conn) \
65 (bix) = ((xcv)->select_index)++ % CVEC_LEN; \
66 (conn) = &((xcv)->cvec[bix]); \
69 #define struct_conn(s) ((struct afs_conn *)(s))
71 #define REPORT_CONNECTIONS_ISSUED 0 /* enable to see utilization */
74 * Find a connection with call slots available, allocating one
75 * if nothing is available and we find an allocated slot
76 * @param xcv A connection vector
77 * @param create If set, a new connection may be created
79 static struct afs_conn *
80 find_preferred_connection(struct sa_conn_vector *xcv, int create)
83 struct afs_conn *tc = NULL;
86 for(cix = 0; cix < CVEC_LEN; ++cix) {
87 tc = &(xcv->cvec[cix]);
91 tc->forceConnectFS = 1;
97 if (tc->refCount < (RX_MAXCALLS-1)) {
100 } else if (cix == (CVEC_LEN-1))
101 conn_vec_select_conn(xcv, bix, tc);
103 } /* for cix < CVEC_LEN */
114 #if REPORT_CONNECTIONS_ISSUED
115 afs_warn("Issuing conn %d refCount=%d parent refCount=%d\n", bix,
116 tc->refCount, xcv->refCount);
122 } /* find_preferred_connection */
126 * Release all connections for unix user xu at server xs
131 release_conns_user_server(struct unixuser *xu, struct server *xs)
136 struct sa_conn_vector *tcv, **lcv, *tcvn;
137 for (sa = (xs)->addr; sa; sa = sa->next_sa) {
139 for (tcv = *lcv; tcv; lcv = &tcv->next, tcv = *lcv) {
140 if (tcv->user == (xu) && tcv->refCount == 0) {
142 /* our old friend, the GLOCK */
143 glocked = ISAFS_GLOCK();
146 for(cix = 0; cix < CVEC_LEN; ++cix) {
147 tc = &(tcv->cvec[cix]);
149 rx_SetConnSecondsUntilNatPing(tc->id, 0);
150 rx_DestroyConnection(tc->id);
151 /* find another eligible connection */
152 if (sa->natping == tc) {
154 struct afs_conn *tcn;
155 for (tcvn = sa->conns; tcvn; tcvn = tcvn->next) {
158 for(cin = 0; cin < CVEC_LEN; ++cin) {
159 tcn = &(tcvn->cvec[cin]);
160 if (tcn->activated) {
161 rx_SetConnSecondsUntilNatPing(tcn->id, 20);
172 afs_osi_Free(tcv, sizeof(struct sa_conn_vector));
173 break; /* at most one instance per server */
174 } /*Found unreferenced connection for user */
176 } /*For each connection on the server */
178 } /* release_conns_user_server */
182 release_conns_vector(struct sa_conn_vector *tcv)
186 struct sa_conn_vector *next;
188 while (tcv != NULL) {
191 /* you know it, you love it, the GLOCK */
192 glocked = ISAFS_GLOCK();
195 for(cix = 0; cix < CVEC_LEN; ++cix) {
196 tc = &(tcv->cvec[cix]);
198 rx_SetConnSecondsUntilNatPing(tc->id, 0);
199 rx_DestroyConnection(tc->id);
200 if (tcv->srvr->natping == tc)
201 tcv->srvr->natping = NULL;
206 afs_osi_Free(tcv, sizeof(struct sa_conn_vector));
210 } /* release_conns_vector */
213 unsigned int VNOSERVERS = 0;
216 * Pick a security object to use for a connection to a given server,
220 * The AFS connection for which the security object is required
221 * @param[out] secLevel
222 * The security level of the returned object
225 * An rx security object. This function is guaranteed to return
226 * an object, although that object may be rxnull (with a secLevel
229 static struct rx_securityClass *
230 afs_pickSecurityObject(struct afs_conn *conn, int *secLevel)
232 struct rx_securityClass *secObj = NULL;
233 union tokenUnion *token;
235 /* Do we have tokens ? */
236 if (conn->parent->user->states & UHasTokens) {
237 token = afs_FindToken(conn->parent->user->tokens, RX_SECIDX_KAD);
239 *secLevel = RX_SECIDX_KAD;
240 /* kerberos tickets on channel 2 */
241 secObj = rxkad_NewClientSecurityObject(
242 cryptall ? rxkad_crypt : rxkad_clear,
243 (struct ktc_encryptionKey *)
244 token->rxkad.clearToken.HandShakeKey,
245 token->rxkad.clearToken.AuthHandle,
246 token->rxkad.ticketLen, token->rxkad.ticket);
247 /* We're going to use this token, so populate the viced */
248 conn->parent->user->viceId = token->rxkad.clearToken.ViceId;
251 if (secObj == NULL) {
253 secObj = rxnull_NewClientSecurityObject();
261 * Try setting up a connection to the server containing the specified fid.
262 * Gets the volume, checks if it's up and does the connection by server address.
265 * @param areq Request filled in by the caller.
266 * @param locktype Type of lock that will be used.
268 * @return The conn struct, or NULL.
271 afs_Conn(struct VenusFid *afid, struct vrequest *areq,
272 afs_int32 locktype, struct rx_connection **rxconn)
274 u_short fsport = AFS_FSPORT;
276 struct afs_conn *tconn = NULL;
277 struct srvAddr *lowp = NULL;
281 struct srvAddr *sa1p;
282 afs_int32 replicated = -1; /* a single RO will increment to 0 */
286 AFS_STATCNT(afs_Conn);
287 /* Get fid's volume. */
288 tv = afs_GetVolume(afid, areq, READ_LOCK);
291 afs_FinalizeReq(areq);
292 areq->volumeError = 1;
297 if (tv->serverHost[0] && tv->serverHost[0]->cell) {
298 fsport = tv->serverHost[0]->cell->fsport;
303 /* First is always lowest rank, if it's up */
304 if ((tv->status[0] == not_busy) && tv->serverHost[0]
305 && tv->serverHost[0]->addr
306 && !(tv->serverHost[0]->addr->sa_flags & SRVR_ISDOWN) &&
307 !(((areq->idleError > 0) || (areq->tokenError > 0))
308 && (areq->skipserver[0] == 1)))
309 lowp = tv->serverHost[0]->addr;
311 /* Otherwise we look at all of them. There are seven levels of
312 * not_busy. This means we will check a volume seven times before it
313 * is marked offline. Ideally, we only need two levels, but this
314 * serves a second purpose of waiting some number of seconds before
315 * the client decides the volume is offline (ie: a clone could finish
318 for (notbusy = not_busy; (!lowp && (notbusy <= end_not_busy)); notbusy++) {
319 for (i = 0; i < AFS_MAXHOSTS && tv->serverHost[i]; i++) {
320 if (tv->states & VRO)
322 if (((areq->tokenError > 0)||(areq->idleError > 0))
323 && (areq->skipserver[i] == 1))
325 if (tv->status[i] != notbusy) {
326 if (tv->status[i] == rd_busy || tv->status[i] == rdwr_busy) {
327 if (!areq->busyCount)
329 } else if (tv->status[i] == offline) {
330 if (!areq->volumeError)
331 areq->volumeError = VOLMISSING;
335 for (sa1p = tv->serverHost[i]->addr; sa1p; sa1p = sa1p->next_sa) {
336 if (sa1p->sa_flags & SRVR_ISDOWN)
338 if (!lowp || (lowp->sa_iprank > sa1p->sa_iprank))
343 if ((replicated == -1) && (tv->states & VRO)) {
344 for (i = 0; i < AFS_MAXHOSTS && tv->serverHost[i]; i++) {
345 if (tv->states & VRO)
351 afs_PutVolume(tv, READ_LOCK);
354 tu = afs_GetUser(areq->uid, afid->Cell, SHARED_LOCK);
355 tconn = afs_ConnBySA(lowp, fsport, afid->Cell, tu, 0 /*!force */ ,
356 1 /*create */ , locktype, replicated, rxconn);
358 afs_PutUser(tu, SHARED_LOCK);
366 * Connects to a server by it's server address.
368 * @param sap Server address.
369 * @param aport Server port.
371 * @param tu Connect as this user.
372 * @param force_if_down
375 * @param locktype Specifies type of lock to be used for this function.
377 * @return The new connection.
380 afs_ConnBySA(struct srvAddr *sap, unsigned short aport, afs_int32 acell,
381 struct unixuser *tu, int force_if_down, afs_int32 create,
382 afs_int32 locktype, afs_int32 replicated,
383 struct rx_connection **rxconn)
385 int glocked, foundvec;
386 struct afs_conn *tc = NULL;
387 struct sa_conn_vector *tcv = NULL;
388 struct rx_securityClass *csec; /*Security class object */
389 int isec; /*Security index */
391 int isrep = (replicated > 0)?CONN_REPLICATED:0;
395 if (!sap || ((sap->sa_flags & SRVR_ISDOWN) && !force_if_down)) {
396 /* sa is known down, and we don't want to force it. */
400 /* find cached connection */
401 ObtainSharedLock(&afs_xconn, 15);
403 for (tcv = sap->conns; tcv; tcv = tcv->next) {
404 if (tcv->user == tu && tcv->port == aport &&
405 (isrep == (tcv->flags & CONN_REPLICATED))) {
406 /* return most eligible conn */
409 UpgradeSToWLock(&afs_xconn, 37);
410 tc = find_preferred_connection(tcv, create);
411 ConvertWToSLock(&afs_xconn);
416 if (!tc && !create) {
417 /* Not found and can't create a new one. */
418 ReleaseSharedLock(&afs_xconn);
422 if (AFS_IS_DISCONNECTED && !AFS_IN_SYNC) {
423 afs_warnuser("afs_ConnBySA: disconnected\n");
424 ReleaseSharedLock(&afs_xconn);
428 if (!foundvec && create) {
429 /* No such connection vector exists. Create one and splice it in.
430 * Make sure the server record has been marked as used (for the purposes
431 * of calculating up & down times, it's now considered to be an
432 * ``active'' server). Also make sure the server's lastUpdateEvalTime
433 * gets set, marking the time of its ``birth''.
435 UpgradeSToWLock(&afs_xconn, 37);
436 new_conn_vector(tcv);
441 tcv->next = sap->conns;
443 tcv->flags |= CONN_REPLICATED;
446 /* all struct afs_conn ptrs come from here */
447 tc = find_preferred_connection(tcv, create);
449 afs_ActivateServer(sap);
451 ConvertWToSLock(&afs_xconn);
452 } /* end of if (!tcv) */
455 /* Not found and no alternatives. */
456 ReleaseSharedLock(&afs_xconn);
460 if (tc->refCount > 10000) {
464 afs_warn("afs: Very high afs_conn refCount detected (conn %p, count %d)\n",
465 tc, (int)tc->refCount);
466 afs_warn("afs: Trying to continue, but this may indicate an issue\n");
467 afs_warn("afs: that may eventually crash the machine. Please file\n");
468 afs_warn("afs: a bug report.\n");
472 if (tu->states & UTokensBad) {
473 /* we may still have an authenticated RPC connection here,
474 * we'll have to create a new, unauthenticated, connection.
475 * Perhaps a better way to do this would be to set
476 * conn->forceConnectFS on all conns when the token first goes
477 * bad, but that's somewhat trickier, due to locking
478 * constraints (though not impossible).
480 if (tc->id && (rx_SecurityClassOf(tc->id) != RX_SECIDX_NULL)) {
481 tc->forceConnectFS = 1; /* force recreation of connection */
483 tu->states &= ~UHasTokens; /* remove the authentication info */
486 glocked = ISAFS_GLOCK();
487 if (tc->forceConnectFS) {
488 UpgradeSToWLock(&afs_xconn, 38);
490 if (sap->natping == tc)
494 rx_SetConnSecondsUntilNatPing(tc->id, 0);
495 rx_DestroyConnection(tc->id);
500 * Stupid hack to determine if using vldb service or file system
503 if (aport == sap->server->cell->vlport)
509 csec = afs_pickSecurityObject(tc, &isec);
513 tc->id = rx_NewConnection(sap->sa_ip, aport, service, csec, isec);
517 rx_SetConnHardDeadTime(tc->id, afs_rx_harddead);
520 /* Setting idle dead time to non-zero activates idle-dead
521 * RX_CALL_TIMEOUT errors. */
523 rx_SetConnIdleDeadTime(tc->id, afs_rx_idledead_rep);
525 rx_SetConnIdleDeadTime(tc->id, afs_rx_idledead);
528 * Only do this for one connection
530 if ((service != 52) && (sap->natping == NULL)) {
532 rx_SetConnSecondsUntilNatPing(tc->id, 20);
535 tc->forceConnectFS = 0; /* apparently we're appropriately connected now */
538 ConvertWToSLock(&afs_xconn);
539 } /* end of if (tc->forceConnectFS)*/
542 rx_GetConnection(*rxconn);
544 ReleaseSharedLock(&afs_xconn);
549 * forceConnectFS is set whenever we must recompute the connection. UTokensBad
550 * is true only if we know that the tokens are bad. We thus clear this flag
551 * when we get a new set of tokens..
552 * Having force... true and UTokensBad true simultaneously means that the tokens
553 * went bad and we're supposed to create a new, unauthenticated, connection.
555 * @param aserver Server to connect to.
556 * @param aport Connection port.
557 * @param acell The cell where all of this happens.
558 * @param areq The request.
559 * @param aforce Force connection?
560 * @param locktype Type of lock to be used.
563 * @return The established connection.
566 afs_ConnByHost(struct server *aserver, unsigned short aport, afs_int32 acell,
567 struct vrequest *areq, int aforce, afs_int32 locktype,
568 afs_int32 replicated, struct rx_connection **rxconn)
571 struct afs_conn *tc = NULL;
572 struct srvAddr *sa = NULL;
576 AFS_STATCNT(afs_ConnByHost);
578 if (AFS_IS_DISCONNECTED && !AFS_IN_SYNC) {
579 afs_warnuser("afs_ConnByHost: disconnected\n");
584 1. look for an existing connection
585 2. create a connection at an address believed to be up
586 (if aforce is true, create a connection at the first address)
589 tu = afs_GetUser(areq->uid, acell, SHARED_LOCK);
591 for (sa = aserver->addr; sa; sa = sa->next_sa) {
592 tc = afs_ConnBySA(sa, aport, acell, tu, aforce,
593 0 /*don't create one */ ,
594 locktype, replicated, rxconn);
600 for (sa = aserver->addr; sa; sa = sa->next_sa) {
601 tc = afs_ConnBySA(sa, aport, acell, tu, aforce,
603 locktype, replicated, rxconn);
609 afs_PutUser(tu, SHARED_LOCK);
612 } /*afs_ConnByHost */
616 * Connect by multiple hosts.
617 * Try to connect to one of the hosts from the ahosts array.
619 * @param ahosts Multiple hosts to connect to.
620 * @param aport Connection port.
621 * @param acell The cell where all of this happens.
622 * @param areq The request.
623 * @param locktype Type of lock to be used.
626 * @return The established connection or NULL.
629 afs_ConnByMHosts(struct server *ahosts[], unsigned short aport,
630 afs_int32 acell, struct vrequest *areq,
631 afs_int32 locktype, afs_int32 replicated,
632 struct rx_connection **rxconn)
635 struct afs_conn *tconn;
640 /* try to find any connection from the set */
641 AFS_STATCNT(afs_ConnByMHosts);
642 for (i = 0; i < AFS_MAXCELLHOSTS; i++) {
643 if ((ts = ahosts[i]) == NULL)
645 tconn = afs_ConnByHost(ts, aport, acell, areq, 0, locktype,
653 } /*afs_ConnByMHosts */
657 * Decrement reference count to this connection.
662 afs_PutConn(struct afs_conn *ac, struct rx_connection *rxconn,
665 AFS_STATCNT(afs_PutConn);
667 if (ac->refCount < 0) {
668 osi_Panic("afs_PutConn: refcount imbalance 0x%lx %d",
669 (unsigned long)(uintptrsz)ac, (int)ac->refCount);
671 ac->parent->refCount--;
672 rx_PutConnection(rxconn);
677 * Free up a connection vector, allowing, eg, code in afs_user.c
678 * to ignore how connections are stored/pooled
682 afs_ReleaseConns(struct sa_conn_vector *tcv) {
683 release_conns_vector(tcv);
688 * Free connection vector(s) for a user
692 afs_ReleaseConnsUser(struct unixuser *au) {
697 for (i = 0; i < NSERVERS; i++) {
698 for (ts = afs_servers[i]; ts; ts = ts->next) {
699 release_conns_user_server(au, ts);
700 } /*For each server on chain */
701 } /*For each chain */
706 * For multi homed clients, a RPC may timeout because of a
707 * client network interface going down. We need to reopen new
708 * connections in this case.
710 * @param sap Server address.
713 ForceNewConnections(struct srvAddr *sap)
716 struct afs_conn *tc = NULL;
717 struct sa_conn_vector *tcv = NULL;
720 return; /* defensive check */
722 ObtainWriteLock(&afs_xconn, 413);
723 for (tcv = sap->conns; tcv; tcv = tcv->next) {
724 for(cix = 0; cix < CVEC_LEN; ++cix) {
725 tc = &(tcv->cvec[cix]);
727 tc->forceConnectFS = 1;
730 ReleaseWriteLock(&afs_xconn);