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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_SEC
  34
  35 #include <linux/libcfs/libcfs.h>
  36 #include <linux/crypto.h>
  37 #include <linux/key.h>
  38
  39 #include <obd.h>
  40 #include <obd_class.h>
  41 #include <obd_support.h>
  42 #include <lustre_import.h>
  43 #include <uapi/linux/lustre/lustre_param.h>
  44 #include <lustre_sec.h>
  45
  46 #include "ptlrpc_internal.h"
  47
  48 enum lustre_sec_part sptlrpc_target_sec_part(struct obd_device *obd)
  49 {
  50         const char *type = obd->obd_type->typ_name;
  51
  52         if (!strcmp(type, LUSTRE_MDT_NAME))
  53                 return LUSTRE_SP_MDT;
  54         if (!strcmp(type, LUSTRE_OST_NAME))
  55                 return LUSTRE_SP_OST;
  56         if (!strcmp(type, LUSTRE_MGS_NAME))
  57                 return LUSTRE_SP_MGS;
  58
  59         CERROR("unknown target %p(%s)\n", obd, type);
  60         return LUSTRE_SP_ANY;
  61 }
  62
  63 /****************************************
  64  * user supplied flavor string parsing  *
  65  ****************************************/
  66
  67 /*
  68  * format: <base_flavor>[-<bulk_type:alg_spec>]
  69  */
  70 int sptlrpc_parse_flavor(const char *str, struct sptlrpc_flavor *flvr)
  71 {
  72         char buf[32];
  73         char *bulk, *alg;
  74
  75         memset(flvr, 0, sizeof(*flvr));
  76
  77         if (!str || str[0] == '\0') {
  78                 flvr->sf_rpc = SPTLRPC_FLVR_INVALID;
  79                 return 0;
  80         }
  81
  82         strlcpy(buf, str, sizeof(buf));
  83
  84         bulk = strchr(buf, '-');
  85         if (bulk)
  86                 *bulk++ = '\0';
  87
  88         flvr->sf_rpc = sptlrpc_name2flavor_base(buf);
  89         if (flvr->sf_rpc == SPTLRPC_FLVR_INVALID)
  90                 goto err_out;
  91
  92         /*
  93          * currently only base flavor "plain" can have bulk specification.
  94          */
  95         if (flvr->sf_rpc == SPTLRPC_FLVR_PLAIN) {
  96                 flvr->u_bulk.hash.hash_alg = BULK_HASH_ALG_ADLER32;
  97                 if (bulk) {
  98                         /*
  99                          * format: plain-hash:<hash_alg>
 100                          */
 101                         alg = strchr(bulk, ':');
 102                         if (!alg)
 103                                 goto err_out;
 104                         *alg++ = '\0';
 105
 106                         if (strcmp(bulk, "hash"))
 107                                 goto err_out;
 108
 109                         flvr->u_bulk.hash.hash_alg = sptlrpc_get_hash_alg(alg);
 110                         if (flvr->u_bulk.hash.hash_alg >= BULK_HASH_ALG_MAX)
 111                                 goto err_out;
 112                 }
 113
 114                 if (flvr->u_bulk.hash.hash_alg == BULK_HASH_ALG_NULL)
 115                         flvr_set_bulk_svc(&flvr->sf_rpc, SPTLRPC_BULK_SVC_NULL);
 116                 else
 117                         flvr_set_bulk_svc(&flvr->sf_rpc, SPTLRPC_BULK_SVC_INTG);
 118         } else {
 119                 if (bulk)
 120                         goto err_out;
 121         }
 122
 123         flvr->sf_flags = 0;
 124         return 0;
 125
 126 err_out:
 127         CERROR("invalid flavor string: %s\n", str);
 128         return -EINVAL;
 129 }
 130 EXPORT_SYMBOL(sptlrpc_parse_flavor);
 131
 132 /****************************************
 133  * configure rules                    *
 134  ****************************************/
 135
 136 static void get_default_flavor(struct sptlrpc_flavor *sf)
 137 {
 138         memset(sf, 0, sizeof(*sf));
 139
 140         sf->sf_rpc = SPTLRPC_FLVR_NULL;
 141         sf->sf_flags = 0;
 142 }
 143
 144 static void sptlrpc_rule_init(struct sptlrpc_rule *rule)
 145 {
 146         rule->sr_netid = LNET_NIDNET(LNET_NID_ANY);
 147         rule->sr_from = LUSTRE_SP_ANY;
 148         rule->sr_to = LUSTRE_SP_ANY;
 149         rule->sr_padding = 0;
 150
 151         get_default_flavor(&rule->sr_flvr);
 152 }
 153
 154 /*
 155  * format: network[.direction]=flavor
 156  */
 157 static int sptlrpc_parse_rule(char *param, struct sptlrpc_rule *rule)
 158 {
 159         char *flavor, *dir;
 160         int rc;
 161
 162         sptlrpc_rule_init(rule);
 163
 164         flavor = strchr(param, '=');
 165         if (!flavor) {
 166                 CERROR("invalid param, no '='\n");
 167                 return -EINVAL;
 168         }
 169         *flavor++ = '\0';
 170
 171         dir = strchr(param, '.');
 172         if (dir)
 173                 *dir++ = '\0';
 174
 175         /* 1.1 network */
 176         if (strcmp(param, "default")) {
 177                 rule->sr_netid = libcfs_str2net(param);
 178                 if (rule->sr_netid == LNET_NIDNET(LNET_NID_ANY)) {
 179                         CERROR("invalid network name: %s\n", param);
 180                         return -EINVAL;
 181                 }
 182         }
 183
 184         /* 1.2 direction */
 185         if (dir) {
 186                 if (!strcmp(dir, "mdt2ost")) {
 187                         rule->sr_from = LUSTRE_SP_MDT;
 188                         rule->sr_to = LUSTRE_SP_OST;
 189                 } else if (!strcmp(dir, "mdt2mdt")) {
 190                         rule->sr_from = LUSTRE_SP_MDT;
 191                         rule->sr_to = LUSTRE_SP_MDT;
 192                 } else if (!strcmp(dir, "cli2ost")) {
 193                         rule->sr_from = LUSTRE_SP_CLI;
 194                         rule->sr_to = LUSTRE_SP_OST;
 195                 } else if (!strcmp(dir, "cli2mdt")) {
 196                         rule->sr_from = LUSTRE_SP_CLI;
 197                         rule->sr_to = LUSTRE_SP_MDT;
 198                 } else {
 199                         CERROR("invalid rule dir segment: %s\n", dir);
 200                         return -EINVAL;
 201                 }
 202         }
 203
 204         /* 2.1 flavor */
 205         rc = sptlrpc_parse_flavor(flavor, &rule->sr_flvr);
 206         if (rc)
 207                 return -EINVAL;
 208
 209         return 0;
 210 }
 211
 212 static void sptlrpc_rule_set_free(struct sptlrpc_rule_set *rset)
 213 {
 214         LASSERT(rset->srs_nslot ||
 215                 (rset->srs_nrule == 0 && !rset->srs_rules));
 216
 217         if (rset->srs_nslot) {
 218                 kfree(rset->srs_rules);
 219                 sptlrpc_rule_set_init(rset);
 220         }
 221 }
 222
 223 /*
 224  * return 0 if the rule set could accommodate one more rule.
 225  */
 226 static int sptlrpc_rule_set_expand(struct sptlrpc_rule_set *rset)
 227 {
 228         struct sptlrpc_rule *rules;
 229         int nslot;
 230
 231         might_sleep();
 232
 233         if (rset->srs_nrule < rset->srs_nslot)
 234                 return 0;
 235
 236         nslot = rset->srs_nslot + 8;
 237
 238         /* better use realloc() if available */
 239         rules = kcalloc(nslot, sizeof(*rset->srs_rules), GFP_NOFS);
 240         if (!rules)
 241                 return -ENOMEM;
 242
 243         if (rset->srs_nrule) {
 244                 LASSERT(rset->srs_nslot && rset->srs_rules);
 245                 memcpy(rules, rset->srs_rules,
 246                        rset->srs_nrule * sizeof(*rset->srs_rules));
 247
 248                 kfree(rset->srs_rules);
 249         }
 250
 251         rset->srs_rules = rules;
 252         rset->srs_nslot = nslot;
 253         return 0;
 254 }
 255
 256 static inline int rule_spec_dir(struct sptlrpc_rule *rule)
 257 {
 258         return (rule->sr_from != LUSTRE_SP_ANY ||
 259                 rule->sr_to != LUSTRE_SP_ANY);
 260 }
 261
 262 static inline int rule_spec_net(struct sptlrpc_rule *rule)
 263 {
 264         return (rule->sr_netid != LNET_NIDNET(LNET_NID_ANY));
 265 }
 266
 267 static inline int rule_match_dir(struct sptlrpc_rule *r1,
 268                                  struct sptlrpc_rule *r2)
 269 {
 270         return (r1->sr_from == r2->sr_from && r1->sr_to == r2->sr_to);
 271 }
 272
 273 static inline int rule_match_net(struct sptlrpc_rule *r1,
 274                                  struct sptlrpc_rule *r2)
 275 {
 276         return (r1->sr_netid == r2->sr_netid);
 277 }
 278
 279 /*
 280  * merge @rule into @rset.
 281  * the @rset slots might be expanded.
 282  */
 283 static int sptlrpc_rule_set_merge(struct sptlrpc_rule_set *rset,
 284                                   struct sptlrpc_rule *rule)
 285 {
 286         struct sptlrpc_rule *p = rset->srs_rules;
 287         int spec_dir, spec_net;
 288         int rc, n, match = 0;
 289
 290         might_sleep();
 291
 292         spec_net = rule_spec_net(rule);
 293         spec_dir = rule_spec_dir(rule);
 294
 295         for (n = 0; n < rset->srs_nrule; n++) {
 296                 p = &rset->srs_rules[n];
 297
 298                 /* test network match, if failed:
 299                  * - spec rule: skip rules which is also spec rule match, until
 300                  *   we hit a wild rule, which means no more chance
 301                  * - wild rule: skip until reach the one which is also wild
 302                  *   and matches
 303                  */
 304                 if (!rule_match_net(p, rule)) {
 305                         if (spec_net) {
 306                                 if (rule_spec_net(p))
 307                                         continue;
 308                                 else
 309                                         break;
 310                         } else {
 311                                 continue;
 312                         }
 313                 }
 314
 315                 /* test dir match, same logic as net matching */
 316                 if (!rule_match_dir(p, rule)) {
 317                         if (spec_dir) {
 318                                 if (rule_spec_dir(p))
 319                                         continue;
 320                                 else
 321                                         break;
 322                         } else {
 323                                 continue;
 324                         }
 325                 }
 326
 327                 /* find a match */
 328                 match = 1;
 329                 break;
 330         }
 331
 332         if (match) {
 333                 LASSERT(n >= 0 && n < rset->srs_nrule);
 334
 335                 if (rule->sr_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 336                         /* remove this rule */
 337                         if (n < rset->srs_nrule - 1)
 338                                 memmove(&rset->srs_rules[n],
 339                                         &rset->srs_rules[n + 1],
 340                                         (rset->srs_nrule - n - 1) *
 341                                         sizeof(*rule));
 342                         rset->srs_nrule--;
 343                 } else {
 344                         /* override the rule */
 345                         memcpy(&rset->srs_rules[n], rule, sizeof(*rule));
 346                 }
 347         } else {
 348                 LASSERT(n >= 0 && n <= rset->srs_nrule);
 349
 350                 if (rule->sr_flvr.sf_rpc != SPTLRPC_FLVR_INVALID) {
 351                         rc = sptlrpc_rule_set_expand(rset);
 352                         if (rc)
 353                                 return rc;
 354
 355                         if (n < rset->srs_nrule)
 356                                 memmove(&rset->srs_rules[n + 1],
 357                                         &rset->srs_rules[n],
 358                                         (rset->srs_nrule - n) * sizeof(*rule));
 359                         memcpy(&rset->srs_rules[n], rule, sizeof(*rule));
 360                         rset->srs_nrule++;
 361                 } else {
 362                         CDEBUG(D_CONFIG, "ignore the unmatched deletion\n");
 363                 }
 364         }
 365
 366         return 0;
 367 }
 368
 369 /**
 370  * given from/to/nid, determine a matching flavor in ruleset.
 371  * return 1 if a match found, otherwise return 0.
 372  */
 373 static int sptlrpc_rule_set_choose(struct sptlrpc_rule_set *rset,
 374                                    enum lustre_sec_part from,
 375                                    enum lustre_sec_part to,
 376                                    lnet_nid_t nid,
 377                                    struct sptlrpc_flavor *sf)
 378 {
 379         struct sptlrpc_rule *r;
 380         int n;
 381
 382         for (n = 0; n < rset->srs_nrule; n++) {
 383                 r = &rset->srs_rules[n];
 384
 385                 if (LNET_NIDNET(nid) != LNET_NIDNET(LNET_NID_ANY) &&
 386                     r->sr_netid != LNET_NIDNET(LNET_NID_ANY) &&
 387                     LNET_NIDNET(nid) != r->sr_netid)
 388                         continue;
 389
 390                 if (from != LUSTRE_SP_ANY && r->sr_from != LUSTRE_SP_ANY &&
 391                     from != r->sr_from)
 392                         continue;
 393
 394                 if (to != LUSTRE_SP_ANY && r->sr_to != LUSTRE_SP_ANY &&
 395                     to != r->sr_to)
 396                         continue;
 397
 398                 *sf = r->sr_flvr;
 399                 return 1;
 400         }
 401
 402         return 0;
 403 }
 404
 405 /**********************************
 406  * sptlrpc configuration support  *
 407  **********************************/
 408
 409 struct sptlrpc_conf_tgt {
 410         struct list_head              sct_list;
 411         char                sct_name[MAX_OBD_NAME];
 412         struct sptlrpc_rule_set sct_rset;
 413 };
 414
 415 struct sptlrpc_conf {
 416         struct list_head              sc_list;
 417         char                sc_fsname[MTI_NAME_MAXLEN];
 418         unsigned int        sc_modified;  /* modified during updating */
 419         unsigned int        sc_updated:1, /* updated copy from MGS */
 420                                 sc_local:1;   /* local copy from target */
 421         struct sptlrpc_rule_set sc_rset;      /* fs general rules */
 422         struct list_head              sc_tgts;      /* target-specific rules */
 423 };
 424
 425 static struct mutex sptlrpc_conf_lock;
 426 static LIST_HEAD(sptlrpc_confs);
 427
 428 static inline int is_hex(char c)
 429 {
 430         return ((c >= '0' && c <= '9') ||
 431                 (c >= 'a' && c <= 'f'));
 432 }
 433
 434 static void target2fsname(const char *tgt, char *fsname, int buflen)
 435 {
 436         const char *ptr;
 437         int len;
 438
 439         ptr = strrchr(tgt, '-');
 440         if (ptr) {
 441                 if ((strncmp(ptr, "-MDT", 4) != 0 &&
 442                      strncmp(ptr, "-OST", 4) != 0) ||
 443                     !is_hex(ptr[4]) || !is_hex(ptr[5]) ||
 444                     !is_hex(ptr[6]) || !is_hex(ptr[7]))
 445                         ptr = NULL;
 446         }
 447
 448         /* if we didn't find the pattern, treat the whole string as fsname */
 449         if (!ptr)
 450                 len = strlen(tgt);
 451         else
 452                 len = ptr - tgt;
 453
 454         len = min(len, buflen - 1);
 455         memcpy(fsname, tgt, len);
 456         fsname[len] = '\0';
 457 }
 458
 459 static void sptlrpc_conf_free_rsets(struct sptlrpc_conf *conf)
 460 {
 461         struct sptlrpc_conf_tgt *conf_tgt, *conf_tgt_next;
 462
 463         sptlrpc_rule_set_free(&conf->sc_rset);
 464
 465         list_for_each_entry_safe(conf_tgt, conf_tgt_next,
 466                                  &conf->sc_tgts, sct_list) {
 467                 sptlrpc_rule_set_free(&conf_tgt->sct_rset);
 468                 list_del(&conf_tgt->sct_list);
 469                 kfree(conf_tgt);
 470         }
 471         LASSERT(list_empty(&conf->sc_tgts));
 472
 473         conf->sc_updated = 0;
 474         conf->sc_local = 0;
 475 }
 476
 477 static void sptlrpc_conf_free(struct sptlrpc_conf *conf)
 478 {
 479         CDEBUG(D_SEC, "free sptlrpc conf %s\n", conf->sc_fsname);
 480
 481         sptlrpc_conf_free_rsets(conf);
 482         list_del(&conf->sc_list);
 483         kfree(conf);
 484 }
 485
 486 static
 487 struct sptlrpc_conf_tgt *sptlrpc_conf_get_tgt(struct sptlrpc_conf *conf,
 488                                               const char *name,
 489                                               int create)
 490 {
 491         struct sptlrpc_conf_tgt *conf_tgt;
 492
 493         list_for_each_entry(conf_tgt, &conf->sc_tgts, sct_list) {
 494                 if (strcmp(conf_tgt->sct_name, name) == 0)
 495                         return conf_tgt;
 496         }
 497
 498         if (!create)
 499                 return NULL;
 500
 501         conf_tgt = kzalloc(sizeof(*conf_tgt), GFP_NOFS);
 502         if (conf_tgt) {
 503                 strlcpy(conf_tgt->sct_name, name, sizeof(conf_tgt->sct_name));
 504                 sptlrpc_rule_set_init(&conf_tgt->sct_rset);
 505                 list_add(&conf_tgt->sct_list, &conf->sc_tgts);
 506         }
 507
 508         return conf_tgt;
 509 }
 510
 511 static
 512 struct sptlrpc_conf *sptlrpc_conf_get(const char *fsname,
 513                                       int create)
 514 {
 515         struct sptlrpc_conf *conf;
 516         size_t len;
 517
 518         list_for_each_entry(conf, &sptlrpc_confs, sc_list) {
 519                 if (strcmp(conf->sc_fsname, fsname) == 0)
 520                         return conf;
 521         }
 522
 523         if (!create)
 524                 return NULL;
 525
 526         conf = kzalloc(sizeof(*conf), GFP_NOFS);
 527         if (!conf)
 528                 return NULL;
 529
 530         len = strlcpy(conf->sc_fsname, fsname, sizeof(conf->sc_fsname));
 531         if (len >= sizeof(conf->sc_fsname)) {
 532                 kfree(conf);
 533                 return NULL;
 534         }
 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) {
 584                 CERROR("missing target name\n");
 585                 return -EINVAL;
 586         }
 587
 588         param = lustre_cfg_string(lcfg, 2);
 589         if (!param) {
 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) {
 608                 target2fsname(target, fsname, sizeof(fsname));
 609
 610                 mutex_lock(&sptlrpc_conf_lock);
 611                 conf = sptlrpc_conf_get(fsname, 0);
 612                 if (!conf) {
 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 || 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)
 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_nested(&obd->u.cli.cl_sem, OBD_CLI_SEM_MDCOSC);
 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 }