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 = 0; /* 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 */
106 afs_warn("find_preferred_connection: no connection and !create\n");
115 #if REPORT_CONNECTIONS_ISSUED
116 afs_warn("Issuing conn %d refCount=%d parent refCount=%d\n", bix,
117 tc->refCount, xcv->refCount);
123 } /* find_preferred_connection */
127 * Release all connections for unix user xu at server xs
132 release_conns_user_server(struct unixuser *xu, struct server *xs)
137 struct sa_conn_vector *tcv, **lcv, *tcvn;
138 for (sa = (xs)->addr; sa; sa = sa->next_sa) {
140 for (tcv = *lcv; tcv; lcv = &tcv->next, tcv = *lcv) {
141 if (tcv->user == (xu) && tcv->refCount == 0) {
143 /* our old friend, the GLOCK */
144 glocked = ISAFS_GLOCK();
147 for(cix = 0; cix < CVEC_LEN; ++cix) {
148 tc = &(tcv->cvec[cix]);
150 rx_SetConnSecondsUntilNatPing(tc->id, 0);
151 rx_DestroyConnection(tc->id);
152 /* find another eligible connection */
153 if (sa->natping == tc) {
155 struct afs_conn *tcn;
156 for (tcvn = sa->conns; tcvn; tcvn = tcvn->next) {
159 for(cin = 0; cin < CVEC_LEN; ++cin) {
160 tcn = &(tcvn->cvec[cin]);
161 if (tcn->activated) {
162 rx_SetConnSecondsUntilNatPing(tcn->id, 20);
173 afs_osi_Free(tcv, sizeof(struct sa_conn_vector));
174 break; /* at most one instance per server */
175 } /*Found unreferenced connection for user */
177 } /*For each connection on the server */
179 } /* release_conns_user_server */
183 release_conns_vector(struct sa_conn_vector *tcv)
187 struct sa_conn_vector *next;
189 while (tcv != NULL) {
192 /* you know it, you love it, the GLOCK */
193 glocked = ISAFS_GLOCK();
196 for(cix = 0; cix < CVEC_LEN; ++cix) {
197 tc = &(tcv->cvec[cix]);
199 rx_SetConnSecondsUntilNatPing(tc->id, 0);
200 rx_DestroyConnection(tc->id);
201 if (tcv->srvr->natping == tc)
202 tcv->srvr->natping = NULL;
207 afs_osi_Free(tcv, sizeof(struct sa_conn_vector));
211 } /* release_conns_vector */
214 unsigned int VNOSERVERS = 0;
217 * Pick a security object to use for a connection to a given server,
221 * The AFS connection for which the security object is required
222 * @param[out] secLevel
223 * The security level of the returned object
226 * An rx security object. This function is guaranteed to return
227 * an object, although that object may be rxnull (with a secLevel
230 static struct rx_securityClass *
231 afs_pickSecurityObject(struct afs_conn *conn, int *secLevel)
233 struct rx_securityClass *secObj = NULL;
234 union tokenUnion *token;
236 /* Do we have tokens ? */
237 if (conn->parent->user->states & UHasTokens) {
238 token = afs_FindToken(conn->parent->user->tokens, RX_SECIDX_KAD);
240 *secLevel = RX_SECIDX_KAD;
241 /* kerberos tickets on channel 2 */
242 secObj = rxkad_NewClientSecurityObject(
243 cryptall ? rxkad_crypt : rxkad_clear,
244 (struct ktc_encryptionKey *)
245 token->rxkad.clearToken.HandShakeKey,
246 token->rxkad.clearToken.AuthHandle,
247 token->rxkad.ticketLen, token->rxkad.ticket);
248 /* We're going to use this token, so populate the viced */
249 conn->parent->user->viceId = token->rxkad.clearToken.ViceId;
252 if (secObj == NULL) {
254 secObj = rxnull_NewClientSecurityObject();
262 * Try setting up a connection to the server containing the specified fid.
263 * Gets the volume, checks if it's up and does the connection by server address.
266 * @param areq Request filled in by the caller.
267 * @param locktype Type of lock that will be used.
269 * @return The conn struct, or NULL.
272 afs_Conn(struct VenusFid *afid, struct vrequest *areq,
273 afs_int32 locktype, struct rx_connection **rxconn)
275 u_short fsport = AFS_FSPORT;
277 struct afs_conn *tconn = NULL;
278 struct srvAddr *lowp = NULL;
282 struct srvAddr *sa1p;
283 afs_int32 replicated = -1; /* a single RO will increment to 0 */
287 AFS_STATCNT(afs_Conn);
288 /* Get fid's volume. */
289 tv = afs_GetVolume(afid, areq, READ_LOCK);
292 afs_FinalizeReq(areq);
293 areq->volumeError = 1;
298 if (tv->serverHost[0] && tv->serverHost[0]->cell) {
299 fsport = tv->serverHost[0]->cell->fsport;
304 /* First is always lowest rank, if it's up */
305 if ((tv->status[0] == not_busy) && tv->serverHost[0]
306 && tv->serverHost[0]->addr
307 && !(tv->serverHost[0]->addr->sa_flags & SRVR_ISDOWN) &&
308 !(((areq->idleError > 0) || (areq->tokenError > 0))
309 && (areq->skipserver[0] == 1)))
310 lowp = tv->serverHost[0]->addr;
312 /* Otherwise we look at all of them. There are seven levels of
313 * not_busy. This means we will check a volume seven times before it
314 * is marked offline. Ideally, we only need two levels, but this
315 * serves a second purpose of waiting some number of seconds before
316 * the client decides the volume is offline (ie: a clone could finish
319 for (notbusy = not_busy; (!lowp && (notbusy <= end_not_busy)); notbusy++) {
320 for (i = 0; i < AFS_MAXHOSTS && tv->serverHost[i]; i++) {
321 if (tv->states & VRO)
323 if (((areq->tokenError > 0)||(areq->idleError > 0))
324 && (areq->skipserver[i] == 1))
326 if (tv->status[i] != notbusy) {
327 if (tv->status[i] == rd_busy || tv->status[i] == rdwr_busy) {
328 if (!areq->busyCount)
330 } else if (tv->status[i] == offline) {
331 if (!areq->volumeError)
332 areq->volumeError = VOLMISSING;
336 for (sa1p = tv->serverHost[i]->addr; sa1p; sa1p = sa1p->next_sa) {
337 if (sa1p->sa_flags & SRVR_ISDOWN)
339 if (!lowp || (lowp->sa_iprank > sa1p->sa_iprank))
344 if ((replicated == -1) && (tv->states & VRO)) {
345 for (i = 0; i < AFS_MAXHOSTS && tv->serverHost[i]; i++) {
346 if (tv->states & VRO)
352 afs_PutVolume(tv, READ_LOCK);
355 tu = afs_GetUser(areq->uid, afid->Cell, SHARED_LOCK);
356 tconn = afs_ConnBySA(lowp, fsport, afid->Cell, tu, 0 /*!force */ ,
357 1 /*create */ , locktype, replicated, rxconn);
359 afs_PutUser(tu, SHARED_LOCK);
367 * Connects to a server by it's server address.
369 * @param sap Server address.
370 * @param aport Server port.
372 * @param tu Connect as this user.
373 * @param force_if_down
376 * @param locktype Specifies type of lock to be used for this function.
378 * @return The new connection.
381 afs_ConnBySA(struct srvAddr *sap, unsigned short aport, afs_int32 acell,
382 struct unixuser *tu, int force_if_down, afs_int32 create,
383 afs_int32 locktype, afs_int32 replicated,
384 struct rx_connection **rxconn)
386 int glocked, foundvec;
387 struct afs_conn *tc = NULL;
388 struct sa_conn_vector *tcv = NULL;
389 struct rx_securityClass *csec; /*Security class object */
390 int isec; /*Security index */
392 int isrep = (replicated > 0)?CONN_REPLICATED:0;
396 /* find cached connection */
397 ObtainSharedLock(&afs_xconn, 15);
399 for (tcv = sap->conns; tcv; tcv = tcv->next) {
400 if (tcv->user == tu && tcv->port == aport &&
401 (isrep == (tcv->flags & CONN_REPLICATED))) {
402 /* return most eligible conn */
405 UpgradeSToWLock(&afs_xconn, 37);
406 tc = find_preferred_connection(tcv, create);
407 ConvertWToSLock(&afs_xconn);
412 if (!tc && !create) {
413 /* Not found and can't create a new one. */
414 ReleaseSharedLock(&afs_xconn);
418 if (AFS_IS_DISCONNECTED && !AFS_IN_SYNC) {
419 afs_warnuser("afs_ConnBySA: disconnected\n");
420 ReleaseSharedLock(&afs_xconn);
424 if (!foundvec && create) {
425 /* No such connection vector exists. Create one and splice it in.
426 * Make sure the server record has been marked as used (for the purposes
427 * of calculating up & down times, it's now considered to be an
428 * ``active'' server). Also make sure the server's lastUpdateEvalTime
429 * gets set, marking the time of its ``birth''.
431 UpgradeSToWLock(&afs_xconn, 37);
432 new_conn_vector(tcv);
437 tcv->next = sap->conns;
439 tcv->flags |= CONN_REPLICATED;
442 /* all struct afs_conn ptrs come from here */
443 tc = find_preferred_connection(tcv, create);
445 afs_ActivateServer(sap);
447 ConvertWToSLock(&afs_xconn);
448 } /* end of if (!tcv) */
451 /* Not found and no alternatives. */
452 ReleaseSharedLock(&afs_xconn);
456 if (tc->refCount > 10000) {
460 afs_warn("afs: Very high afs_conn refCount detected (conn %p, count %d)\n",
461 tc, (int)tc->refCount);
462 afs_warn("afs: Trying to continue, but this may indicate an issue\n");
463 afs_warn("afs: that may eventually crash the machine. Please file\n");
464 afs_warn("afs: a bug report.\n");
468 if (tu->states & UTokensBad) {
469 /* we may still have an authenticated RPC connection here,
470 * we'll have to create a new, unauthenticated, connection.
471 * Perhaps a better way to do this would be to set
472 * conn->forceConnectFS on all conns when the token first goes
473 * bad, but that's somewhat trickier, due to locking
474 * constraints (though not impossible).
476 if (tc->id && (rx_SecurityClassOf(tc->id) != RX_SECIDX_NULL)) {
477 tc->forceConnectFS = 1; /* force recreation of connection */
479 tu->states &= ~UHasTokens; /* remove the authentication info */
482 glocked = ISAFS_GLOCK();
483 if (tc->forceConnectFS) {
484 UpgradeSToWLock(&afs_xconn, 38);
486 if (sap->natping == tc)
490 rx_SetConnSecondsUntilNatPing(tc->id, 0);
491 rx_DestroyConnection(tc->id);
496 * Stupid hack to determine if using vldb service or file system
499 if (aport == sap->server->cell->vlport)
505 csec = afs_pickSecurityObject(tc, &isec);
509 tc->id = rx_NewConnection(sap->sa_ip, aport, service, csec, isec);
513 rx_SetConnHardDeadTime(tc->id, afs_rx_harddead);
516 /* Setting idle dead time to non-zero activates idle-dead
517 * RX_CALL_TIMEOUT errors. */
519 rx_SetConnIdleDeadTime(tc->id, afs_rx_idledead_rep);
521 rx_SetConnIdleDeadTime(tc->id, afs_rx_idledead);
524 * Only do this for one connection
526 if ((service != 52) && (sap->natping == NULL)) {
528 rx_SetConnSecondsUntilNatPing(tc->id, 20);
531 tc->forceConnectFS = 0; /* apparently we're appropriately connected now */
534 ConvertWToSLock(&afs_xconn);
535 } /* end of if (tc->forceConnectFS)*/
538 rx_GetConnection(*rxconn);
540 ReleaseSharedLock(&afs_xconn);
545 * forceConnectFS is set whenever we must recompute the connection. UTokensBad
546 * is true only if we know that the tokens are bad. We thus clear this flag
547 * when we get a new set of tokens..
548 * Having force... true and UTokensBad true simultaneously means that the tokens
549 * went bad and we're supposed to create a new, unauthenticated, connection.
551 * @param aserver Server to connect to.
552 * @param aport Connection port.
553 * @param acell The cell where all of this happens.
554 * @param areq The request.
555 * @param aforce Force connection?
556 * @param locktype Type of lock to be used.
559 * @return The established connection.
562 afs_ConnByHost(struct server *aserver, unsigned short aport, afs_int32 acell,
563 struct vrequest *areq, int aforce, afs_int32 locktype,
564 afs_int32 replicated, struct rx_connection **rxconn)
567 struct afs_conn *tc = NULL;
568 struct srvAddr *sa = NULL;
572 AFS_STATCNT(afs_ConnByHost);
574 if (AFS_IS_DISCONNECTED && !AFS_IN_SYNC) {
575 afs_warnuser("afs_ConnByHost: disconnected\n");
580 1. look for an existing connection
581 2. create a connection at an address believed to be up
582 (if aforce is true, create a connection at the first address)
585 tu = afs_GetUser(areq->uid, acell, SHARED_LOCK);
587 for (sa = aserver->addr; sa; sa = sa->next_sa) {
588 tc = afs_ConnBySA(sa, aport, acell, tu, aforce,
589 0 /*don't create one */ ,
590 locktype, replicated, rxconn);
596 for (sa = aserver->addr; sa; sa = sa->next_sa) {
597 tc = afs_ConnBySA(sa, aport, acell, tu, aforce,
599 locktype, replicated, rxconn);
605 afs_PutUser(tu, SHARED_LOCK);
608 } /*afs_ConnByHost */
612 * Connect by multiple hosts.
613 * Try to connect to one of the hosts from the ahosts array.
615 * @param ahosts Multiple hosts to connect to.
616 * @param aport Connection port.
617 * @param acell The cell where all of this happens.
618 * @param areq The request.
619 * @param locktype Type of lock to be used.
622 * @return The established connection or NULL.
625 afs_ConnByMHosts(struct server *ahosts[], unsigned short aport,
626 afs_int32 acell, struct vrequest *areq,
627 afs_int32 locktype, afs_int32 replicated,
628 struct rx_connection **rxconn)
631 struct afs_conn *tconn;
636 /* try to find any connection from the set */
637 AFS_STATCNT(afs_ConnByMHosts);
638 for (i = 0; i < AFS_MAXCELLHOSTS; i++) {
639 if ((ts = ahosts[i]) == NULL)
641 tconn = afs_ConnByHost(ts, aport, acell, areq, 0, locktype,
649 } /*afs_ConnByMHosts */
653 * Decrement reference count to this connection.
658 afs_PutConn(struct afs_conn *ac, struct rx_connection *rxconn,
661 AFS_STATCNT(afs_PutConn);
663 if (ac->refCount < 0) {
664 osi_Panic("afs_PutConn: refcount imbalance 0x%lx %d",
665 (unsigned long)(uintptrsz)ac, (int)ac->refCount);
667 ac->parent->refCount--;
668 rx_PutConnection(rxconn);
673 * Free up a connection vector, allowing, eg, code in afs_user.c
674 * to ignore how connections are stored/pooled
678 afs_ReleaseConns(struct sa_conn_vector *tcv) {
679 release_conns_vector(tcv);
684 * Free connection vector(s) for a user
688 afs_ReleaseConnsUser(struct unixuser *au) {
693 for (i = 0; i < NSERVERS; i++) {
694 for (ts = afs_servers[i]; ts; ts = ts->next) {
695 release_conns_user_server(au, ts);
696 } /*For each server on chain */
697 } /*For each chain */
702 * For multi homed clients, a RPC may timeout because of a
703 * client network interface going down. We need to reopen new
704 * connections in this case.
706 * @param sap Server address.
709 ForceNewConnections(struct srvAddr *sap)
712 struct afs_conn *tc = NULL;
713 struct sa_conn_vector *tcv = NULL;
716 return; /* defensive check */
718 ObtainWriteLock(&afs_xconn, 413);
719 for (tcv = sap->conns; tcv; tcv = tcv->next) {
720 for(cix = 0; cix < CVEC_LEN; ++cix) {
721 tc = &(tcv->cvec[cix]);
723 tc->forceConnectFS = 1;
726 ReleaseWriteLock(&afs_xconn);