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