kernel/drivers/staging/lustre/lustre/ptlrpc/sec_config.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_SEC
  38
  39 #include "../../include/linux/libcfs/libcfs.h"
  40 #include <linux/crypto.h>
  41 #include <linux/key.h>
  42
  43 #include "../include/obd.h"
  44 #include "../include/obd_support.h"
  45 #include "../include/lustre_import.h"
  46 #include "../include/lustre_param.h"
  47 #include "../include/lustre_sec.h"
  48
  49 #include "ptlrpc_internal.h"
  50
  51 enum lustre_sec_part sptlrpc_target_sec_part(struct obd_device *obd)
  52 {
  53         const char *type = obd->obd_type->typ_name;
  54
  55         if (!strcmp(type, LUSTRE_MDT_NAME))
  56                 return LUSTRE_SP_MDT;
  57         if (!strcmp(type, LUSTRE_OST_NAME))
  58                 return LUSTRE_SP_OST;
  59         if (!strcmp(type, LUSTRE_MGS_NAME))
  60                 return LUSTRE_SP_MGS;
  61
  62         CERROR("unknown target %p(%s)\n", obd, type);
  63         return LUSTRE_SP_ANY;
  64 }
  65 EXPORT_SYMBOL(sptlrpc_target_sec_part);
  66
  67 /****************************************
  68  * user supplied flavor string parsing  *
  69  ****************************************/
  70
  71 /*
  72  * format: <base_flavor>[-<bulk_type:alg_spec>]
  73  */
  74 int sptlrpc_parse_flavor(const char *str, struct sptlrpc_flavor *flvr)
  75 {
  76         char buf[32];
  77         char *bulk, *alg;
  78
  79         memset(flvr, 0, sizeof(*flvr));
  80
  81         if (str == NULL || str[0] == '\0') {
  82                 flvr->sf_rpc = SPTLRPC_FLVR_INVALID;
  83                 return 0;
  84         }
  85
  86         strncpy(buf, str, sizeof(buf));
  87         buf[sizeof(buf) - 1] = '\0';
  88
  89         bulk = strchr(buf, '-');
  90         if (bulk)
  91                 *bulk++ = '\0';
  92
  93         flvr->sf_rpc = sptlrpc_name2flavor_base(buf);
  94         if (flvr->sf_rpc == SPTLRPC_FLVR_INVALID)
  95                 goto err_out;
  96
  97         /*
  98          * currently only base flavor "plain" can have bulk specification.
  99          */
 100         if (flvr->sf_rpc == SPTLRPC_FLVR_PLAIN) {
 101                 flvr->u_bulk.hash.hash_alg = BULK_HASH_ALG_ADLER32;
 102                 if (bulk) {
 103                         /*
 104                          * format: plain-hash:<hash_alg>
 105                          */
 106                         alg = strchr(bulk, ':');
 107                         if (alg == NULL)
 108                                 goto err_out;
 109                         *alg++ = '\0';
 110
 111                         if (strcmp(bulk, "hash"))
 112                                 goto err_out;
 113
 114                         flvr->u_bulk.hash.hash_alg = sptlrpc_get_hash_alg(alg);
 115                         if (flvr->u_bulk.hash.hash_alg >= BULK_HASH_ALG_MAX)
 116                                 goto err_out;
 117                 }
 118
 119                 if (flvr->u_bulk.hash.hash_alg == BULK_HASH_ALG_NULL)
 120                         flvr_set_bulk_svc(&flvr->sf_rpc, SPTLRPC_BULK_SVC_NULL);
 121                 else
 122                         flvr_set_bulk_svc(&flvr->sf_rpc, SPTLRPC_BULK_SVC_INTG);
 123         } else {
 124                 if (bulk)
 125                         goto err_out;
 126         }
 127
 128         flvr->sf_flags = 0;
 129         return 0;
 130
 131 err_out:
 132         CERROR("invalid flavor string: %s\n", str);
 133         return -EINVAL;
 134 }
 135 EXPORT_SYMBOL(sptlrpc_parse_flavor);
 136
 137 /****************************************
 138  * configure rules                    *
 139  ****************************************/
 140
 141 static void get_default_flavor(struct sptlrpc_flavor *sf)
 142 {
 143         memset(sf, 0, sizeof(*sf));
 144
 145         sf->sf_rpc = SPTLRPC_FLVR_NULL;
 146         sf->sf_flags = 0;
 147 }
 148
 149 static void sptlrpc_rule_init(struct sptlrpc_rule *rule)
 150 {
 151         rule->sr_netid = LNET_NIDNET(LNET_NID_ANY);
 152         rule->sr_from = LUSTRE_SP_ANY;
 153         rule->sr_to = LUSTRE_SP_ANY;
 154         rule->sr_padding = 0;
 155
 156         get_default_flavor(&rule->sr_flvr);
 157 }
 158
 159 /*
 160  * format: network[.direction]=flavor
 161  */
 162 static int sptlrpc_parse_rule(char *param, struct sptlrpc_rule *rule)
 163 {
 164         char *flavor, *dir;
 165         int rc;
 166
 167         sptlrpc_rule_init(rule);
 168
 169         flavor = strchr(param, '=');
 170         if (flavor == NULL) {
 171                 CERROR("invalid param, no '='\n");
 172                 return -EINVAL;
 173         }
 174         *flavor++ = '\0';
 175
 176         dir = strchr(param, '.');
 177         if (dir)
 178                 *dir++ = '\0';
 179
 180         /* 1.1 network */
 181         if (strcmp(param, "default")) {
 182                 rule->sr_netid = libcfs_str2net(param);
 183                 if (rule->sr_netid == LNET_NIDNET(LNET_NID_ANY)) {
 184                         CERROR("invalid network name: %s\n", param);
 185                         return -EINVAL;
 186                 }
 187         }
 188
 189         /* 1.2 direction */
 190         if (dir) {
 191                 if (!strcmp(dir, "mdt2ost")) {
 192                         rule->sr_from = LUSTRE_SP_MDT;
 193                         rule->sr_to = LUSTRE_SP_OST;
 194                 } else if (!strcmp(dir, "mdt2mdt")) {
 195                         rule->sr_from = LUSTRE_SP_MDT;
 196                         rule->sr_to = LUSTRE_SP_MDT;
 197                 } else if (!strcmp(dir, "cli2ost")) {
 198                         rule->sr_from = LUSTRE_SP_CLI;
 199                         rule->sr_to = LUSTRE_SP_OST;
 200                 } else if (!strcmp(dir, "cli2mdt")) {
 201                         rule->sr_from = LUSTRE_SP_CLI;
 202                         rule->sr_to = LUSTRE_SP_MDT;
 203                 } else {
 204                         CERROR("invalid rule dir segment: %s\n", dir);
 205                         return -EINVAL;
 206                 }
 207         }
 208
 209         /* 2.1 flavor */
 210         rc = sptlrpc_parse_flavor(flavor, &rule->sr_flvr);
 211         if (rc)
 212                 return -EINVAL;
 213
 214         return 0;
 215 }
 216
 217 static void sptlrpc_rule_set_free(struct sptlrpc_rule_set *rset)
 218 {
 219         LASSERT(rset->srs_nslot ||
 220                 (rset->srs_nrule == 0 && rset->srs_rules == NULL));
 221
 222         if (rset->srs_nslot) {
 223                 kfree(rset->srs_rules);
 224                 sptlrpc_rule_set_init(rset);
 225         }
 226 }
 227
 228 /*
 229  * return 0 if the rule set could accommodate one more rule.
 230  */
 231 static int sptlrpc_rule_set_expand(struct sptlrpc_rule_set *rset)
 232 {
 233         struct sptlrpc_rule *rules;
 234         int nslot;
 235
 236         might_sleep();
 237
 238         if (rset->srs_nrule < rset->srs_nslot)
 239                 return 0;
 240
 241         nslot = rset->srs_nslot + 8;
 242
 243         /* better use realloc() if available */
 244         rules = kcalloc(nslot, sizeof(*rset->srs_rules), GFP_NOFS);
 245         if (rules == NULL)
 246                 return -ENOMEM;
 247
 248         if (rset->srs_nrule) {
 249                 LASSERT(rset->srs_nslot && rset->srs_rules);
 250                 memcpy(rules, rset->srs_rules,
 251                        rset->srs_nrule * sizeof(*rset->srs_rules));
 252
 253                 kfree(rset->srs_rules);
 254         }
 255
 256         rset->srs_rules = rules;
 257         rset->srs_nslot = nslot;
 258         return 0;
 259 }
 260
 261 static inline int rule_spec_dir(struct sptlrpc_rule *rule)
 262 {
 263         return (rule->sr_from != LUSTRE_SP_ANY ||
 264                 rule->sr_to != LUSTRE_SP_ANY);
 265 }
 266
 267 static inline int rule_spec_net(struct sptlrpc_rule *rule)
 268 {
 269         return (rule->sr_netid != LNET_NIDNET(LNET_NID_ANY));
 270 }
 271
 272 static inline int rule_match_dir(struct sptlrpc_rule *r1,
 273                                  struct sptlrpc_rule *r2)
 274 {
 275         return (r1->sr_from == r2->sr_from && r1->sr_to == r2->sr_to);
 276 }
 277
 278 static inline int rule_match_net(struct sptlrpc_rule *r1,
 279                                  struct sptlrpc_rule *r2)
 280 {
 281         return (r1->sr_netid == r2->sr_netid);
 282 }
 283
 284 /*
 285  * merge @rule into @rset.
 286  * the @rset slots might be expanded.
 287  */
 288 static int sptlrpc_rule_set_merge(struct sptlrpc_rule_set *rset,
 289                                   struct sptlrpc_rule *rule)
 290 {
 291         struct sptlrpc_rule *p = rset->srs_rules;
 292         int spec_dir, spec_net;
 293         int rc, n, match = 0;
 294
 295         might_sleep();
 296
 297         spec_net = rule_spec_net(rule);
 298         spec_dir = rule_spec_dir(rule);
 299
 300         for (n = 0; n < rset->srs_nrule; n++) {
 301                 p = &rset->srs_rules[n];
 302
 303                 /* test network match, if failed:
 304                  * - spec rule: skip rules which is also spec rule match, until
 305                  *   we hit a wild rule, which means no more chance
 306                  * - wild rule: skip until reach the one which is also wild
 307                  *   and matches
 308                  */
 309                 if (!rule_match_net(p, rule)) {
 310                         if (spec_net) {
 311                                 if (rule_spec_net(p))
 312                                         continue;
 313                                 else
 314                                         break;
 315                         } else {
 316                                 continue;
 317                         }
 318                 }
 319
 320                 /* test dir match, same logic as net matching */
 321                 if (!rule_match_dir(p, rule)) {
 322                         if (spec_dir) {
 323                                 if (rule_spec_dir(p))
 324                                         continue;
 325                                 else
 326                                         break;
 327                         } else {
 328                                 continue;
 329                         }
 330                 }
 331
 332                 /* find a match */
 333                 match = 1;
 334                 break;
 335         }
 336
 337         if (match) {
 338                 LASSERT(n >= 0 && n < rset->srs_nrule);
 339
 340                 if (rule->sr_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 341                         /* remove this rule */
 342                         if (n < rset->srs_nrule - 1)
 343                                 memmove(&rset->srs_rules[n],
 344                                         &rset->srs_rules[n + 1],
 345                                         (rset->srs_nrule - n - 1) *
 346                                         sizeof(*rule));
 347                         rset->srs_nrule--;
 348                 } else {
 349                         /* override the rule */
 350                         memcpy(&rset->srs_rules[n], rule, sizeof(*rule));
 351                 }
 352         } else {
 353                 LASSERT(n >= 0 && n <= rset->srs_nrule);
 354
 355                 if (rule->sr_flvr.sf_rpc != SPTLRPC_FLVR_INVALID) {
 356                         rc = sptlrpc_rule_set_expand(rset);
 357                         if (rc)
 358                                 return rc;
 359
 360                         if (n < rset->srs_nrule)
 361                                 memmove(&rset->srs_rules[n + 1],
 362                                         &rset->srs_rules[n],
 363                                         (rset->srs_nrule - n) * sizeof(*rule));
 364                         memcpy(&rset->srs_rules[n], rule, sizeof(*rule));
 365                         rset->srs_nrule++;
 366                 } else {
 367                         CDEBUG(D_CONFIG, "ignore the unmatched deletion\n");
 368                 }
 369         }
 370
 371         return 0;
 372 }
 373
 374 /**
 375  * given from/to/nid, determine a matching flavor in ruleset.
 376  * return 1 if a match found, otherwise return 0.
 377  */
 378 static int sptlrpc_rule_set_choose(struct sptlrpc_rule_set *rset,
 379                                    enum lustre_sec_part from,
 380                                    enum lustre_sec_part to,
 381                                    lnet_nid_t nid,
 382                                    struct sptlrpc_flavor *sf)
 383 {
 384         struct sptlrpc_rule *r;
 385         int n;
 386
 387         for (n = 0; n < rset->srs_nrule; n++) {
 388                 r = &rset->srs_rules[n];
 389
 390                 if (LNET_NIDNET(nid) != LNET_NIDNET(LNET_NID_ANY) &&
 391                     r->sr_netid != LNET_NIDNET(LNET_NID_ANY) &&
 392                     LNET_NIDNET(nid) != r->sr_netid)
 393                         continue;
 394
 395                 if (from != LUSTRE_SP_ANY && r->sr_from != LUSTRE_SP_ANY &&
 396                     from != r->sr_from)
 397                         continue;
 398
 399                 if (to != LUSTRE_SP_ANY && r->sr_to != LUSTRE_SP_ANY &&
 400                     to != r->sr_to)
 401                         continue;
 402
 403                 *sf = r->sr_flvr;
 404                 return 1;
 405         }
 406
 407         return 0;
 408 }
 409
 410 /**********************************
 411  * sptlrpc configuration support  *
 412  **********************************/
 413
 414 struct sptlrpc_conf_tgt {
 415         struct list_head              sct_list;
 416         char                sct_name[MAX_OBD_NAME];
 417         struct sptlrpc_rule_set sct_rset;
 418 };
 419
 420 struct sptlrpc_conf {
 421         struct list_head              sc_list;
 422         char                sc_fsname[MTI_NAME_MAXLEN];
 423         unsigned int        sc_modified;  /* modified during updating */
 424         unsigned int        sc_updated:1, /* updated copy from MGS */
 425                                 sc_local:1;   /* local copy from target */
 426         struct sptlrpc_rule_set sc_rset;      /* fs general rules */
 427         struct list_head              sc_tgts;      /* target-specific rules */
 428 };
 429
 430 static struct mutex sptlrpc_conf_lock;
 431 static LIST_HEAD(sptlrpc_confs);
 432
 433 static inline int is_hex(char c)
 434 {
 435         return ((c >= '0' && c <= '9') ||
 436                 (c >= 'a' && c <= 'f'));
 437 }
 438
 439 static void target2fsname(const char *tgt, char *fsname, int buflen)
 440 {
 441         const char *ptr;
 442         int len;
 443
 444         ptr = strrchr(tgt, '-');
 445         if (ptr) {
 446                 if ((strncmp(ptr, "-MDT", 4) != 0 &&
 447                      strncmp(ptr, "-OST", 4) != 0) ||
 448                     !is_hex(ptr[4]) || !is_hex(ptr[5]) ||
 449                     !is_hex(ptr[6]) || !is_hex(ptr[7]))
 450                         ptr = NULL;
 451         }
 452
 453         /* if we didn't find the pattern, treat the whole string as fsname */
 454         if (ptr == NULL)
 455                 len = strlen(tgt);
 456         else
 457                 len = ptr - tgt;
 458
 459         len = min(len, buflen - 1);
 460         memcpy(fsname, tgt, len);
 461         fsname[len] = '\0';
 462 }
 463
 464 static void sptlrpc_conf_free_rsets(struct sptlrpc_conf *conf)
 465 {
 466         struct sptlrpc_conf_tgt *conf_tgt, *conf_tgt_next;
 467
 468         sptlrpc_rule_set_free(&conf->sc_rset);
 469
 470         list_for_each_entry_safe(conf_tgt, conf_tgt_next,
 471                                      &conf->sc_tgts, sct_list) {
 472                 sptlrpc_rule_set_free(&conf_tgt->sct_rset);
 473                 list_del(&conf_tgt->sct_list);
 474                 kfree(conf_tgt);
 475         }
 476         LASSERT(list_empty(&conf->sc_tgts));
 477
 478         conf->sc_updated = 0;
 479         conf->sc_local = 0;
 480 }
 481
 482 static void sptlrpc_conf_free(struct sptlrpc_conf *conf)
 483 {
 484         CDEBUG(D_SEC, "free sptlrpc conf %s\n", conf->sc_fsname);
 485
 486         sptlrpc_conf_free_rsets(conf);
 487         list_del(&conf->sc_list);
 488         kfree(conf);
 489 }
 490
 491 static
 492 struct sptlrpc_conf_tgt *sptlrpc_conf_get_tgt(struct sptlrpc_conf *conf,
 493                                               const char *name,
 494                                               int create)
 495 {
 496         struct sptlrpc_conf_tgt *conf_tgt;
 497
 498         list_for_each_entry(conf_tgt, &conf->sc_tgts, sct_list) {
 499                 if (strcmp(conf_tgt->sct_name, name) == 0)
 500                         return conf_tgt;
 501         }
 502
 503         if (!create)
 504                 return NULL;
 505
 506         conf_tgt = kzalloc(sizeof(*conf_tgt), GFP_NOFS);
 507         if (conf_tgt) {
 508                 strlcpy(conf_tgt->sct_name, name, sizeof(conf_tgt->sct_name));
 509                 sptlrpc_rule_set_init(&conf_tgt->sct_rset);
 510                 list_add(&conf_tgt->sct_list, &conf->sc_tgts);
 511         }
 512
 513         return conf_tgt;
 514 }
 515
 516 static
 517 struct sptlrpc_conf *sptlrpc_conf_get(const char *fsname,
 518                                       int create)
 519 {
 520         struct sptlrpc_conf *conf;
 521
 522         list_for_each_entry(conf, &sptlrpc_confs, sc_list) {
 523                 if (strcmp(conf->sc_fsname, fsname) == 0)
 524                         return conf;
 525         }
 526
 527         if (!create)
 528                 return NULL;
 529
 530         conf = kzalloc(sizeof(*conf), GFP_NOFS);
 531         if (!conf)
 532                 return NULL;
 533
 534         strcpy(conf->sc_fsname, fsname);
 535         sptlrpc_rule_set_init(&conf->sc_rset);
 536         INIT_LIST_HEAD(&conf->sc_tgts);
 537         list_add(&conf->sc_list, &sptlrpc_confs);
 538
 539         CDEBUG(D_SEC, "create sptlrpc conf %s\n", conf->sc_fsname);
 540         return conf;
 541 }
 542
 543 /**
 544  * caller must hold conf_lock already.
 545  */
 546 static int sptlrpc_conf_merge_rule(struct sptlrpc_conf *conf,
 547                                    const char *target,
 548                                    struct sptlrpc_rule *rule)
 549 {
 550         struct sptlrpc_conf_tgt *conf_tgt;
 551         struct sptlrpc_rule_set *rule_set;
 552
 553         /* fsname == target means general rules for the whole fs */
 554         if (strcmp(conf->sc_fsname, target) == 0) {
 555                 rule_set = &conf->sc_rset;
 556         } else {
 557                 conf_tgt = sptlrpc_conf_get_tgt(conf, target, 1);
 558                 if (conf_tgt) {
 559                         rule_set = &conf_tgt->sct_rset;
 560                 } else {
 561                         CERROR("out of memory, can't merge rule!\n");
 562                         return -ENOMEM;
 563                 }
 564         }
 565
 566         return sptlrpc_rule_set_merge(rule_set, rule);
 567 }
 568
 569 /**
 570  * process one LCFG_SPTLRPC_CONF record. if \a conf is NULL, we
 571  * find one through the target name in the record inside conf_lock;
 572  * otherwise means caller already hold conf_lock.
 573  */
 574 static int __sptlrpc_process_config(struct lustre_cfg *lcfg,
 575                                     struct sptlrpc_conf *conf)
 576 {
 577         char *target, *param;
 578         char fsname[MTI_NAME_MAXLEN];
 579         struct sptlrpc_rule rule;
 580         int rc;
 581
 582         target = lustre_cfg_string(lcfg, 1);
 583         if (target == NULL) {
 584                 CERROR("missing target name\n");
 585                 return -EINVAL;
 586         }
 587
 588         param = lustre_cfg_string(lcfg, 2);
 589         if (param == NULL) {
 590                 CERROR("missing parameter\n");
 591                 return -EINVAL;
 592         }
 593
 594         CDEBUG(D_SEC, "processing rule: %s.%s\n", target, param);
 595
 596         /* parse rule to make sure the format is correct */
 597         if (strncmp(param, PARAM_SRPC_FLVR, sizeof(PARAM_SRPC_FLVR) - 1) != 0) {
 598                 CERROR("Invalid sptlrpc parameter: %s\n", param);
 599                 return -EINVAL;
 600         }
 601         param += sizeof(PARAM_SRPC_FLVR) - 1;
 602
 603         rc = sptlrpc_parse_rule(param, &rule);
 604         if (rc)
 605                 return -EINVAL;
 606
 607         if (conf == NULL) {
 608                 target2fsname(target, fsname, sizeof(fsname));
 609
 610                 mutex_lock(&sptlrpc_conf_lock);
 611                 conf = sptlrpc_conf_get(fsname, 0);
 612                 if (conf == NULL) {
 613                         CERROR("can't find conf\n");
 614                         rc = -ENOMEM;
 615                 } else {
 616                         rc = sptlrpc_conf_merge_rule(conf, target, &rule);
 617                 }
 618                 mutex_unlock(&sptlrpc_conf_lock);
 619         } else {
 620                 LASSERT(mutex_is_locked(&sptlrpc_conf_lock));
 621                 rc = sptlrpc_conf_merge_rule(conf, target, &rule);
 622         }
 623
 624         if (rc == 0)
 625                 conf->sc_modified++;
 626
 627         return rc;
 628 }
 629
 630 int sptlrpc_process_config(struct lustre_cfg *lcfg)
 631 {
 632         return __sptlrpc_process_config(lcfg, NULL);
 633 }
 634 EXPORT_SYMBOL(sptlrpc_process_config);
 635
 636 static int logname2fsname(const char *logname, char *buf, int buflen)
 637 {
 638         char *ptr;
 639         int len;
 640
 641         ptr = strrchr(logname, '-');
 642         if (ptr == NULL || strcmp(ptr, "-sptlrpc")) {
 643                 CERROR("%s is not a sptlrpc config log\n", logname);
 644                 return -EINVAL;
 645         }
 646
 647         len = min((int) (ptr - logname), buflen - 1);
 648
 649         memcpy(buf, logname, len);
 650         buf[len] = '\0';
 651         return 0;
 652 }
 653
 654 void sptlrpc_conf_log_update_begin(const char *logname)
 655 {
 656         struct sptlrpc_conf *conf;
 657         char fsname[16];
 658
 659         if (logname2fsname(logname, fsname, sizeof(fsname)))
 660                 return;
 661
 662         mutex_lock(&sptlrpc_conf_lock);
 663
 664         conf = sptlrpc_conf_get(fsname, 0);
 665         if (conf) {
 666                 if (conf->sc_local) {
 667                         LASSERT(conf->sc_updated == 0);
 668                         sptlrpc_conf_free_rsets(conf);
 669                 }
 670                 conf->sc_modified = 0;
 671         }
 672
 673         mutex_unlock(&sptlrpc_conf_lock);
 674 }
 675 EXPORT_SYMBOL(sptlrpc_conf_log_update_begin);
 676
 677 /**
 678  * mark a config log has been updated
 679  */
 680 void sptlrpc_conf_log_update_end(const char *logname)
 681 {
 682         struct sptlrpc_conf *conf;
 683         char fsname[16];
 684
 685         if (logname2fsname(logname, fsname, sizeof(fsname)))
 686                 return;
 687
 688         mutex_lock(&sptlrpc_conf_lock);
 689
 690         conf = sptlrpc_conf_get(fsname, 0);
 691         if (conf) {
 692                 /*
 693                  * if original state is not updated, make sure the
 694                  * modified counter > 0 to enforce updating local copy.
 695                  */
 696                 if (conf->sc_updated == 0)
 697                         conf->sc_modified++;
 698
 699                 conf->sc_updated = 1;
 700         }
 701
 702         mutex_unlock(&sptlrpc_conf_lock);
 703 }
 704 EXPORT_SYMBOL(sptlrpc_conf_log_update_end);
 705
 706 void sptlrpc_conf_log_start(const char *logname)
 707 {
 708         char fsname[16];
 709
 710         if (logname2fsname(logname, fsname, sizeof(fsname)))
 711                 return;
 712
 713         mutex_lock(&sptlrpc_conf_lock);
 714         sptlrpc_conf_get(fsname, 1);
 715         mutex_unlock(&sptlrpc_conf_lock);
 716 }
 717 EXPORT_SYMBOL(sptlrpc_conf_log_start);
 718
 719 void sptlrpc_conf_log_stop(const char *logname)
 720 {
 721         struct sptlrpc_conf *conf;
 722         char fsname[16];
 723
 724         if (logname2fsname(logname, fsname, sizeof(fsname)))
 725                 return;
 726
 727         mutex_lock(&sptlrpc_conf_lock);
 728         conf = sptlrpc_conf_get(fsname, 0);
 729         if (conf)
 730                 sptlrpc_conf_free(conf);
 731         mutex_unlock(&sptlrpc_conf_lock);
 732 }
 733 EXPORT_SYMBOL(sptlrpc_conf_log_stop);
 734
 735 static inline void flavor_set_flags(struct sptlrpc_flavor *sf,
 736                                     enum lustre_sec_part from,
 737                                     enum lustre_sec_part to,
 738                                     unsigned int fl_udesc)
 739 {
 740         /*
 741          * null flavor doesn't need to set any flavor, and in fact
 742          * we'd better not do that because everybody share a single sec.
 743          */
 744         if (sf->sf_rpc == SPTLRPC_FLVR_NULL)
 745                 return;
 746
 747         if (from == LUSTRE_SP_MDT) {
 748                 /* MDT->MDT; MDT->OST */
 749                 sf->sf_flags |= PTLRPC_SEC_FL_ROOTONLY;
 750         } else if (from == LUSTRE_SP_CLI && to == LUSTRE_SP_OST) {
 751                 /* CLI->OST */
 752                 sf->sf_flags |= PTLRPC_SEC_FL_ROOTONLY | PTLRPC_SEC_FL_BULK;
 753         } else if (from == LUSTRE_SP_CLI && to == LUSTRE_SP_MDT) {
 754                 /* CLI->MDT */
 755                 if (fl_udesc && sf->sf_rpc != SPTLRPC_FLVR_NULL)
 756                         sf->sf_flags |= PTLRPC_SEC_FL_UDESC;
 757         }
 758 }
 759
 760 void sptlrpc_conf_choose_flavor(enum lustre_sec_part from,
 761                                 enum lustre_sec_part to,
 762                                 struct obd_uuid *target,
 763                                 lnet_nid_t nid,
 764                                 struct sptlrpc_flavor *sf)
 765 {
 766         struct sptlrpc_conf *conf;
 767         struct sptlrpc_conf_tgt *conf_tgt;
 768         char name[MTI_NAME_MAXLEN];
 769         int len, rc = 0;
 770
 771         target2fsname(target->uuid, name, sizeof(name));
 772
 773         mutex_lock(&sptlrpc_conf_lock);
 774
 775         conf = sptlrpc_conf_get(name, 0);
 776         if (conf == NULL)
 777                 goto out;
 778
 779         /* convert uuid name (supposed end with _UUID) to target name */
 780         len = strlen(target->uuid);
 781         LASSERT(len > 5);
 782         memcpy(name, target->uuid, len - 5);
 783         name[len - 5] = '\0';
 784
 785         conf_tgt = sptlrpc_conf_get_tgt(conf, name, 0);
 786         if (conf_tgt) {
 787                 rc = sptlrpc_rule_set_choose(&conf_tgt->sct_rset,
 788                                              from, to, nid, sf);
 789                 if (rc)
 790                         goto out;
 791         }
 792
 793         rc = sptlrpc_rule_set_choose(&conf->sc_rset, from, to, nid, sf);
 794 out:
 795         mutex_unlock(&sptlrpc_conf_lock);
 796
 797         if (rc == 0)
 798                 get_default_flavor(sf);
 799
 800         flavor_set_flags(sf, from, to, 1);
 801 }
 802
 803 #define SEC_ADAPT_DELAY  (10)
 804
 805 /**
 806  * called by client devices, notify the sptlrpc config has changed and
 807  * do import_sec_adapt later.
 808  */
 809 void sptlrpc_conf_client_adapt(struct obd_device *obd)
 810 {
 811         struct obd_import *imp;
 812
 813         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0 ||
 814                 strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) == 0);
 815         CDEBUG(D_SEC, "obd %s\n", obd->u.cli.cl_target_uuid.uuid);
 816
 817         /* serialize with connect/disconnect import */
 818         down_read(&obd->u.cli.cl_sem);
 819
 820         imp = obd->u.cli.cl_import;
 821         if (imp) {
 822                 spin_lock(&imp->imp_lock);
 823                 if (imp->imp_sec)
 824                         imp->imp_sec_expire = ktime_get_real_seconds() +
 825                                 SEC_ADAPT_DELAY;
 826                 spin_unlock(&imp->imp_lock);
 827         }
 828
 829         up_read(&obd->u.cli.cl_sem);
 830 }
 831 EXPORT_SYMBOL(sptlrpc_conf_client_adapt);
 832
 833 int sptlrpc_conf_init(void)
 834 {
 835         mutex_init(&sptlrpc_conf_lock);
 836         return 0;
 837 }
 838
 839 void sptlrpc_conf_fini(void)
 840 {
 841         struct sptlrpc_conf *conf, *conf_next;
 842
 843         mutex_lock(&sptlrpc_conf_lock);
 844         list_for_each_entry_safe(conf, conf_next, &sptlrpc_confs, sc_list) {
 845                 sptlrpc_conf_free(conf);
 846         }
 847         LASSERT(list_empty(&sptlrpc_confs));
 848         mutex_unlock(&sptlrpc_conf_lock);
 849 }