1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Modifications for Lustre
5 * Copyright 2004 - 2006, Cluster File Systems, Inc.
7 * Author: Eric Mei <ericm@clusterfs.com>
11 * Neil Brown <neilb@cse.unsw.edu.au>
12 * J. Bruce Fields <bfields@umich.edu>
13 * Andy Adamson <andros@umich.edu>
14 * Dug Song <dugsong@monkey.org>
16 * RPCSEC_GSS server authentication.
17 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
20 * The RPCSEC_GSS involves three stages:
23 * 3/ context destruction
25 * Context creation is handled largely by upcalls to user-space.
26 * In particular, GSS_Accept_sec_context is handled by an upcall
27 * Data exchange is handled entirely within the kernel
28 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
29 * Context destruction is handled in-kernel
30 * GSS_Delete_sec_context is in-kernel
32 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
33 * The context handle and gss_token are used as a key into the rpcsec_init cache.
34 * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
35 * being major_status, minor_status, context_handle, reply_token.
36 * These are sent back to the client.
37 * Sequence window management is handled by the kernel. The window size if currently
38 * a compile time constant.
40 * When user-space is happy that a context is established, it places an entry
41 * in the rpcsec_context cache. The key for this cache is the context_handle.
42 * The content includes:
43 * uid/gidlist - for determining access rights
45 * mechanism specific information, such as a key
49 #define DEBUG_SUBSYSTEM S_SEC
51 #include <linux/types.h>
52 #include <linux/init.h>
53 #include <linux/module.h>
54 #include <linux/slab.h>
55 #include <linux/hash.h>
56 #include <linux/mutex.h>
57 #include <linux/sunrpc/cache.h>
59 #include <liblustre.h>
63 #include <obd_class.h>
64 #include <obd_support.h>
65 #include <lustre/lustre_idl.h>
66 #include <lustre_net.h>
67 #include <lustre_import.h>
68 #include <lustre_sec.h>
71 #include "gss_internal.h"
74 #define GSS_SVC_UPCALL_TIMEOUT (20)
76 static spinlock_t __ctx_index_lock = SPIN_LOCK_UNLOCKED;
77 static __u64 __ctx_index;
79 __u64 gss_get_next_ctx_index(void)
83 spin_lock(&__ctx_index_lock);
85 spin_unlock(&__ctx_index_lock);
90 static inline unsigned long hash_mem(char *buf, int length, int bits)
92 unsigned long hash = 0;
107 if ((len & (BITS_PER_LONG/8-1)) == 0)
108 hash = hash_long(hash^l, BITS_PER_LONG);
111 return hash >> (BITS_PER_LONG - bits);
114 /****************************************
116 ****************************************/
118 #define RSI_HASHBITS (6)
119 #define RSI_HASHMAX (1 << RSI_HASHBITS)
120 #define RSI_HASHMASK (RSI_HASHMAX - 1)
126 wait_queue_head_t waitq;
127 rawobj_t in_handle, in_token;
128 rawobj_t out_handle, out_token;
129 int major_status, minor_status;
132 static struct cache_head *rsi_table[RSI_HASHMAX];
133 static struct cache_detail rsi_cache;
134 static struct rsi *rsi_lookup(struct rsi *item, int set);
136 static void rsi_free(struct rsi *rsi)
138 rawobj_free(&rsi->in_handle);
139 rawobj_free(&rsi->in_token);
140 rawobj_free(&rsi->out_handle);
141 rawobj_free(&rsi->out_token);
144 static void rsi_put(struct cache_head *item, struct cache_detail *cd)
146 struct rsi *rsi = container_of(item, struct rsi, h);
148 LASSERT(atomic_read(&item->refcnt) > 0);
150 if (cache_put(item, cd)) {
151 LASSERT(item->next == NULL);
153 kfree(rsi); /* created by cache mgmt using kmalloc */
157 static inline int rsi_hash(struct rsi *item)
159 return hash_mem((char *)item->in_handle.data, item->in_handle.len,
161 hash_mem((char *)item->in_token.data, item->in_token.len,
165 static inline int rsi_match(struct rsi *item, struct rsi *tmp)
167 return (rawobj_equal(&item->in_handle, &tmp->in_handle) &&
168 rawobj_equal(&item->in_token, &tmp->in_token));
171 static void rsi_request(struct cache_detail *cd,
172 struct cache_head *h,
173 char **bpp, int *blen)
175 struct rsi *rsi = container_of(h, struct rsi, h);
178 /* if in_handle is null, provide kernel suggestion */
179 if (rsi->in_handle.len == 0)
180 index = gss_get_next_ctx_index();
182 qword_addhex(bpp, blen, (char *) &rsi->lustre_svc,
183 sizeof(rsi->lustre_svc));
184 qword_addhex(bpp, blen, (char *) &rsi->nid, sizeof(rsi->nid));
185 qword_addhex(bpp, blen, (char *) &index, sizeof(index));
186 qword_addhex(bpp, blen, rsi->in_handle.data, rsi->in_handle.len);
187 qword_addhex(bpp, blen, rsi->in_token.data, rsi->in_token.len);
191 static inline void rsi_init(struct rsi *new, struct rsi *item)
193 new->out_handle = RAWOBJ_EMPTY;
194 new->out_token = RAWOBJ_EMPTY;
196 new->in_handle = item->in_handle;
197 item->in_handle = RAWOBJ_EMPTY;
198 new->in_token = item->in_token;
199 item->in_token = RAWOBJ_EMPTY;
201 new->lustre_svc = item->lustre_svc;
202 new->nid = item->nid;
203 init_waitqueue_head(&new->waitq);
206 static inline void rsi_update(struct rsi *new, struct rsi *item)
208 LASSERT(new->out_handle.len == 0);
209 LASSERT(new->out_token.len == 0);
211 new->out_handle = item->out_handle;
212 item->out_handle = RAWOBJ_EMPTY;
213 new->out_token = item->out_token;
214 item->out_token = RAWOBJ_EMPTY;
216 new->major_status = item->major_status;
217 new->minor_status = item->minor_status;
220 static int rsi_parse(struct cache_detail *cd, char *mesg, int mlen)
225 struct rsi rsii, *rsip = NULL;
227 int status = -EINVAL;
231 memset(&rsii, 0, sizeof(rsii));
234 len = qword_get(&mesg, buf, mlen);
237 if (rawobj_alloc(&rsii.in_handle, buf, len)) {
243 len = qword_get(&mesg, buf, mlen);
246 if (rawobj_alloc(&rsii.in_token, buf, len)) {
252 expiry = get_expiry(&mesg);
256 len = qword_get(&mesg, buf, mlen);
261 rsii.major_status = simple_strtol(buf, &ep, 10);
266 len = qword_get(&mesg, buf, mlen);
269 rsii.minor_status = simple_strtol(buf, &ep, 10);
274 len = qword_get(&mesg, buf, mlen);
277 if (rawobj_alloc(&rsii.out_handle, buf, len)) {
283 len = qword_get(&mesg, buf, mlen);
286 if (rawobj_alloc(&rsii.out_token, buf, len)) {
291 rsii.h.expiry_time = expiry;
292 rsip = rsi_lookup(&rsii, 1);
297 wake_up_all(&rsip->waitq);
298 rsi_put(&rsip->h, &rsi_cache);
302 CERROR("rsi parse error %d\n", status);
306 static struct cache_detail rsi_cache = {
307 .hash_size = RSI_HASHMAX,
308 .hash_table = rsi_table,
309 .name = "auth.sptlrpc.init",
310 .cache_put = rsi_put,
311 .cache_request = rsi_request,
312 .cache_parse = rsi_parse,
315 static DefineSimpleCacheLookup(rsi, 0)
317 /****************************************
319 ****************************************/
321 #define RSC_HASHBITS (10)
322 #define RSC_HASHMAX (1 << RSC_HASHBITS)
323 #define RSC_HASHMASK (RSC_HASHMAX - 1)
327 struct obd_device *target;
329 struct gss_svc_ctx ctx;
332 static struct cache_head *rsc_table[RSC_HASHMAX];
333 static struct cache_detail rsc_cache;
334 static struct rsc *rsc_lookup(struct rsc *item, int set);
336 static void rsc_free(struct rsc *rsci)
338 rawobj_free(&rsci->handle);
339 rawobj_free(&rsci->ctx.gsc_rvs_hdl);
340 lgss_delete_sec_context(&rsci->ctx.gsc_mechctx);
343 static void rsc_put(struct cache_head *item, struct cache_detail *cd)
345 struct rsc *rsci = container_of(item, struct rsc, h);
347 LASSERT(atomic_read(&item->refcnt) > 0);
349 if (cache_put(item, cd)) {
350 LASSERT(item->next == NULL);
352 kfree(rsci); /* created by cache mgmt using kmalloc */
356 static inline int rsc_hash(struct rsc *rsci)
358 return hash_mem((char *)rsci->handle.data,
359 rsci->handle.len, RSC_HASHBITS);
362 static inline int rsc_match(struct rsc *new, struct rsc *tmp)
364 return rawobj_equal(&new->handle, &tmp->handle);
367 static inline void rsc_init(struct rsc *new, struct rsc *tmp)
369 new->handle = tmp->handle;
370 tmp->handle = RAWOBJ_EMPTY;
373 memset(&new->ctx, 0, sizeof(new->ctx));
374 new->ctx.gsc_rvs_hdl = RAWOBJ_EMPTY;
377 static inline void rsc_update(struct rsc *new, struct rsc *tmp)
380 tmp->ctx.gsc_rvs_hdl = RAWOBJ_EMPTY;
381 tmp->ctx.gsc_mechctx = NULL;
383 memset(&new->ctx.gsc_seqdata, 0, sizeof(new->ctx.gsc_seqdata));
384 spin_lock_init(&new->ctx.gsc_seqdata.ssd_lock);
387 static int rsc_parse(struct cache_detail *cd, char *mesg, int mlen)
390 int len, rv, tmp_int;
391 struct rsc rsci, *rscp = NULL;
393 int status = -EINVAL;
395 memset(&rsci, 0, sizeof(rsci));
398 len = qword_get(&mesg, buf, mlen);
399 if (len < 0) goto out;
401 if (rawobj_alloc(&rsci.handle, buf, len))
406 expiry = get_expiry(&mesg);
412 rv = get_int(&mesg, &tmp_int);
414 CERROR("fail to get remote flag\n");
417 rsci.ctx.gsc_remote = (tmp_int != 0);
420 rv = get_int(&mesg, &tmp_int);
422 CERROR("fail to get oss user flag\n");
425 rsci.ctx.gsc_usr_root = (tmp_int != 0);
428 rv = get_int(&mesg, &tmp_int);
430 CERROR("fail to get mds user flag\n");
433 rsci.ctx.gsc_usr_mds = (tmp_int != 0);
436 rv = get_int(&mesg, (int *) &rsci.ctx.gsc_mapped_uid);
438 CERROR("fail to get mapped uid\n");
442 /* uid, or NEGATIVE */
443 rv = get_int(&mesg, (int *) &rsci.ctx.gsc_uid);
447 CERROR("NOENT? set rsc entry negative\n");
448 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
450 struct gss_api_mech *gm;
452 unsigned long ctx_expiry;
455 if (get_int(&mesg, (int *) &rsci.ctx.gsc_gid))
459 len = qword_get(&mesg, buf, mlen);
462 gm = lgss_name_to_mech(buf);
463 status = -EOPNOTSUPP;
468 /* mech-specific data: */
469 len = qword_get(&mesg, buf, mlen);
475 tmp_buf.data = (unsigned char *)buf;
476 if (lgss_import_sec_context(&tmp_buf, gm,
477 &rsci.ctx.gsc_mechctx)) {
482 /* currently the expiry time passed down from user-space
483 * is invalid, here we retrive it from mech. */
484 if (lgss_inquire_context(rsci.ctx.gsc_mechctx, &ctx_expiry)) {
485 CERROR("unable to get expire time, drop it\n");
489 expiry = (time_t) ctx_expiry;
494 rsci.h.expiry_time = expiry;
495 rscp = rsc_lookup(&rsci, 1);
500 rsc_put(&rscp->h, &rsc_cache);
503 CERROR("parse rsc error %d\n", status);
507 /****************************************
509 ****************************************/
511 typedef int rsc_entry_match(struct rsc *rscp, long data);
513 static void rsc_flush(rsc_entry_match *match, long data)
515 struct cache_head **ch;
520 write_lock(&rsc_cache.hash_lock);
521 for (n = 0; n < RSC_HASHMAX; n++) {
522 for (ch = &rsc_cache.hash_table[n]; *ch;) {
523 rscp = container_of(*ch, struct rsc, h);
525 if (!match(rscp, data)) {
530 /* it seems simply set NEGATIVE doesn't work */
534 set_bit(CACHE_NEGATIVE, &rscp->h.flags);
535 rsc_put(&rscp->h, &rsc_cache);
539 write_unlock(&rsc_cache.hash_lock);
543 static int match_uid(struct rsc *rscp, long uid)
547 return ((int) rscp->ctx.gsc_uid == (int) uid);
550 static int match_target(struct rsc *rscp, long target)
552 return (rscp->target == (struct obd_device *) target);
555 static inline void rsc_flush_uid(int uid)
558 CWARN("flush all gss contexts...\n");
560 rsc_flush(match_uid, (long) uid);
563 static inline void rsc_flush_target(struct obd_device *target)
565 rsc_flush(match_target, (long) target);
568 void gss_secsvc_flush(struct obd_device *target)
570 rsc_flush_target(target);
572 EXPORT_SYMBOL(gss_secsvc_flush);
574 static struct cache_detail rsc_cache = {
575 .hash_size = RSC_HASHMAX,
576 .hash_table = rsc_table,
577 .name = "auth.sptlrpc.context",
578 .cache_put = rsc_put,
579 .cache_parse = rsc_parse,
582 static DefineSimpleCacheLookup(rsc, 0);
584 static struct rsc *gss_svc_searchbyctx(rawobj_t *handle)
589 memset(&rsci, 0, sizeof(rsci));
590 if (rawobj_dup(&rsci.handle, handle))
593 found = rsc_lookup(&rsci, 0);
597 if (cache_check(&rsc_cache, &found->h, NULL))
602 int gss_svc_upcall_install_rvs_ctx(struct obd_import *imp,
603 struct gss_sec *gsec,
604 struct gss_cli_ctx *gctx)
606 struct rsc rsci, *rscp;
607 unsigned long ctx_expiry;
611 memset(&rsci, 0, sizeof(rsci));
613 if (rawobj_alloc(&rsci.handle, (char *) &gsec->gs_rvs_hdl,
614 sizeof(gsec->gs_rvs_hdl))) {
615 CERROR("unable alloc handle\n");
619 major = lgss_copy_reverse_context(gctx->gc_mechctx,
620 &rsci.ctx.gsc_mechctx);
621 if (major != GSS_S_COMPLETE) {
622 CERROR("unable to copy reverse context\n");
627 if (lgss_inquire_context(rsci.ctx.gsc_mechctx, &ctx_expiry)) {
628 CERROR("unable to get expire time, drop it\n");
633 rsci.h.expiry_time = (time_t) ctx_expiry;
634 rsci.target = imp->imp_obd;
636 rscp = rsc_lookup(&rsci, 1);
640 rscp->ctx.gsc_usr_root = 1;
641 rscp->ctx.gsc_usr_mds= 1;
642 rscp->ctx.gsc_reverse = 1;
644 rawobj_dup(&gctx->gc_svc_handle, &rscp->handle);
646 CWARN("create reverse svc ctx %p to %s: idx "LPX64"\n",
647 &rscp->ctx, obd2cli_tgt(imp->imp_obd),
650 rsc_put(&rscp->h, &rsc_cache);
656 int gss_svc_upcall_expire_rvs_ctx(rawobj_t *handle)
658 const cfs_time_t expire = 20;
661 rscp = gss_svc_searchbyctx(handle);
663 CDEBUG(D_SEC, "reverse svcctx %p (rsc %p) expire soon\n",
666 rscp->h.expiry_time = cfs_time_current_sec() + expire;
667 rsc_put(&rscp->h, &rsc_cache);
672 int gss_svc_upcall_dup_handle(rawobj_t *handle, struct gss_svc_ctx *ctx)
674 struct rsc *rscp = container_of(ctx, struct rsc, ctx);
676 return rawobj_dup(handle, &rscp->handle);
679 int gss_svc_upcall_update_sequence(rawobj_t *handle, __u32 seq)
683 rscp = gss_svc_searchbyctx(handle);
685 CDEBUG(D_SEC, "reverse svcctx %p (rsc %p) update seq to %u\n",
686 &rscp->ctx, rscp, seq + 1);
688 rscp->ctx.gsc_rvs_seq = seq + 1;
689 rsc_put(&rscp->h, &rsc_cache);
694 static struct cache_deferred_req* cache_upcall_defer(struct cache_req *req)
698 static struct cache_req cache_upcall_chandle = { cache_upcall_defer };
700 int gss_svc_upcall_handle_init(struct ptlrpc_request *req,
701 struct gss_svc_reqctx *grctx,
702 struct gss_wire_ctx *gw,
703 struct obd_device *target,
708 struct ptlrpc_reply_state *rs;
709 struct rsc *rsci = NULL;
710 struct rsi *rsip = NULL, rsikey;
712 int replen = sizeof(struct ptlrpc_body);
713 struct gss_rep_header *rephdr;
715 int rc = SECSVC_DROP;
718 memset(&rsikey, 0, sizeof(rsikey));
719 rsikey.lustre_svc = lustre_svc;
720 rsikey.nid = (__u64) req->rq_peer.nid;
722 /* duplicate context handle. for INIT it always 0 */
723 if (rawobj_dup(&rsikey.in_handle, &gw->gw_handle)) {
724 CERROR("fail to dup context handle\n");
728 if (rawobj_dup(&rsikey.in_token, in_token)) {
729 CERROR("can't duplicate token\n");
730 rawobj_free(&rsikey.in_handle);
734 rsip = rsi_lookup(&rsikey, 0);
737 CERROR("error in rsi_lookup.\n");
739 if (!gss_pack_err_notify(req, GSS_S_FAILURE, 0))
740 rc = SECSVC_COMPLETE;
745 cache_get(&rsip->h); /* take an extra ref */
746 init_waitqueue_head(&rsip->waitq);
747 init_waitqueue_entry(&wait, current);
748 add_wait_queue(&rsip->waitq, &wait);
751 /* Note each time cache_check() will drop a reference if return
752 * non-zero. We hold an extra reference on initial rsip, but must
753 * take care of following calls. */
754 rc = cache_check(&rsi_cache, &rsip->h, &cache_upcall_chandle);
762 read_lock(&rsi_cache.hash_lock);
763 valid = test_bit(CACHE_VALID, &rsip->h.flags);
765 set_current_state(TASK_INTERRUPTIBLE);
766 read_unlock(&rsi_cache.hash_lock);
769 schedule_timeout(GSS_SVC_UPCALL_TIMEOUT * HZ);
774 CWARN("waited %ds timeout, drop\n", GSS_SVC_UPCALL_TIMEOUT);
778 CWARN("cache_check return ENOENT, drop\n");
781 /* if not the first check, we have to release the extra
782 * reference we just added on it. */
784 cache_put(&rsip->h, &rsi_cache);
785 CDEBUG(D_SEC, "cache_check is good\n");
789 remove_wait_queue(&rsip->waitq, &wait);
790 cache_put(&rsip->h, &rsi_cache);
793 GOTO(out, rc = SECSVC_DROP);
796 rsci = gss_svc_searchbyctx(&rsip->out_handle);
798 CERROR("authentication failed\n");
800 if (!gss_pack_err_notify(req, GSS_S_FAILURE, 0))
801 rc = SECSVC_COMPLETE;
806 grctx->src_ctx = &rsci->ctx;
809 if (rawobj_dup(&rsci->ctx.gsc_rvs_hdl, rvs_hdl)) {
810 CERROR("failed duplicate reverse handle\n");
814 rsci->target = target;
816 CDEBUG(D_SEC, "server create rsc %p(%u->%s)\n",
817 rsci, rsci->ctx.gsc_uid, libcfs_nid2str(req->rq_peer.nid));
819 if (rsip->out_handle.len > PTLRPC_GSS_MAX_HANDLE_SIZE) {
820 CERROR("handle size %u too large\n", rsip->out_handle.len);
821 GOTO(out, rc = SECSVC_DROP);
825 grctx->src_reserve_len = size_round4(rsip->out_token.len);
827 rc = lustre_pack_reply_v2(req, 1, &replen, NULL);
829 CERROR("failed to pack reply: %d\n", rc);
830 GOTO(out, rc = SECSVC_DROP);
833 rs = req->rq_reply_state;
834 LASSERT(rs->rs_repbuf->lm_bufcount == 3);
835 LASSERT(rs->rs_repbuf->lm_buflens[0] >=
836 sizeof(*rephdr) + rsip->out_handle.len);
837 LASSERT(rs->rs_repbuf->lm_buflens[2] >= rsip->out_token.len);
839 rephdr = lustre_msg_buf(rs->rs_repbuf, 0, 0);
840 rephdr->gh_version = PTLRPC_GSS_VERSION;
841 rephdr->gh_flags = 0;
842 rephdr->gh_proc = PTLRPC_GSS_PROC_ERR;
843 rephdr->gh_major = rsip->major_status;
844 rephdr->gh_minor = rsip->minor_status;
845 rephdr->gh_seqwin = GSS_SEQ_WIN;
846 rephdr->gh_handle.len = rsip->out_handle.len;
847 memcpy(rephdr->gh_handle.data, rsip->out_handle.data,
848 rsip->out_handle.len);
850 memcpy(lustre_msg_buf(rs->rs_repbuf, 2, 0), rsip->out_token.data,
851 rsip->out_token.len);
853 rs->rs_repdata_len = lustre_shrink_msg(rs->rs_repbuf, 2,
854 rsip->out_token.len, 0);
859 /* it looks like here we should put rsip also, but this mess up
860 * with NFS cache mgmt code... FIXME */
863 rsi_put(&rsip->h, &rsi_cache);
867 /* if anything went wrong, we don't keep the context too */
869 set_bit(CACHE_NEGATIVE, &rsci->h.flags);
871 CDEBUG(D_SEC, "create rsc with idx "LPX64"\n",
872 gss_handle_to_u64(&rsci->handle));
874 rsc_put(&rsci->h, &rsc_cache);
879 struct gss_svc_ctx *gss_svc_upcall_get_ctx(struct ptlrpc_request *req,
880 struct gss_wire_ctx *gw)
884 rsc = gss_svc_searchbyctx(&gw->gw_handle);
886 CWARN("Invalid gss ctx idx "LPX64" from %s\n",
887 gss_handle_to_u64(&gw->gw_handle),
888 libcfs_nid2str(req->rq_peer.nid));
895 void gss_svc_upcall_put_ctx(struct gss_svc_ctx *ctx)
897 struct rsc *rsc = container_of(ctx, struct rsc, ctx);
899 rsc_put(&rsc->h, &rsc_cache);
902 void gss_svc_upcall_destroy_ctx(struct gss_svc_ctx *ctx)
904 struct rsc *rsc = container_of(ctx, struct rsc, ctx);
907 set_bit(CACHE_NEGATIVE, &rsc->h.flags);
908 /* to be removed at next scan */
909 rsc->h.expiry_time = 1;
912 int __init gss_init_svc_upcall(void)
916 cache_register(&rsi_cache);
917 cache_register(&rsc_cache);
919 /* FIXME this looks stupid. we intend to give lsvcgssd a chance to open
920 * the init upcall channel, otherwise there's big chance that the first
921 * upcall issued before the channel be opened thus nfsv4 cache code will
922 * drop the request direclty, thus lead to unnecessary recovery time.
923 * here we wait at miximum 1.5 seconds. */
924 for (i = 0; i < 6; i++) {
925 if (atomic_read(&rsi_cache.readers) > 0)
927 set_current_state(TASK_UNINTERRUPTIBLE);
929 schedule_timeout(HZ / 4);
932 if (atomic_read(&rsi_cache.readers) == 0)
933 CWARN("Init channel is not opened by lsvcgssd, following "
934 "request might be dropped until lsvcgssd is active\n");
936 /* this helps reducing context index confliction. after server reboot,
937 * conflicting request from clients might be filtered out by initial
938 * sequence number checking, thus no chance to sent error notification
939 * back to clients. */
940 get_random_bytes(&__ctx_index, sizeof(__ctx_index));
945 void __exit gss_exit_svc_upcall(void)
949 cache_purge(&rsi_cache);
950 if ((rc = cache_unregister(&rsi_cache)))
951 CERROR("unregister rsi cache: %d\n", rc);
953 cache_purge(&rsc_cache);
954 if ((rc = cache_unregister(&rsc_cache)))
955 CERROR("unregister rsc cache: %d\n", rc);