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, 2017, 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 <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_net.h>
  43 #include <lustre_import.h>
  44 #include <lustre_log.h>
  45 #include <lustre_disk.h>
  46 #include <lustre_dlm.h>
  47 #include <uapi/linux/lustre/lustre_param.h>
  48 #include <lustre_sec.h>
  49
  50 #include "ptlrpc_internal.h"
  51
  52 const char *sptlrpc_part2name(enum lustre_sec_part part)
  53 {
  54         switch (part) {
  55         case LUSTRE_SP_CLI:
  56                 return "cli";
  57         case LUSTRE_SP_MDT:
  58                 return "mdt";
  59         case LUSTRE_SP_OST:
  60                 return "ost";
  61         case LUSTRE_SP_MGC:
  62                 return "mgc";
  63         case LUSTRE_SP_MGS:
  64                 return "mgs";
  65         case LUSTRE_SP_ANY:
  66                 return "any";
  67         default:
  68                 return "err";
  69         }
  70 }
  71 EXPORT_SYMBOL(sptlrpc_part2name);
  72
  73 enum lustre_sec_part sptlrpc_target_sec_part(struct obd_device *obd)
  74 {
  75         const char *type = obd->obd_type->typ_name;
  76
  77         if (!strcmp(type, LUSTRE_MDT_NAME))
  78                 return LUSTRE_SP_MDT;
  79         if (!strcmp(type, LUSTRE_OST_NAME))
  80                 return LUSTRE_SP_OST;
  81         if (!strcmp(type, LUSTRE_MGS_NAME))
  82                 return LUSTRE_SP_MGS;
  83
  84         CERROR("unknown target %p(%s)\n", obd, type);
  85         return LUSTRE_SP_ANY;
  86 }
  87
  88 /****************************************
  89  * user supplied flavor string parsing  *
  90  ****************************************/
  91
  92 /*
  93  * format: <base_flavor>[-<bulk_type:alg_spec>]
  94  */
  95 int sptlrpc_parse_flavor(const char *str, struct sptlrpc_flavor *flvr)
  96 {
  97         char            buf[32];
  98         char           *bulk, *alg;
  99
 100         memset(flvr, 0, sizeof(*flvr));
 101
 102         if (str == NULL || str[0] == '\0') {
 103                 flvr->sf_rpc = SPTLRPC_FLVR_INVALID;
 104                 return 0;
 105         }
 106
 107         strlcpy(buf, str, sizeof(buf));
 108
 109         bulk = strchr(buf, '-');
 110         if (bulk)
 111                 *bulk++ = '\0';
 112
 113         flvr->sf_rpc = sptlrpc_name2flavor_base(buf);
 114         if (flvr->sf_rpc == SPTLRPC_FLVR_INVALID)
 115                 goto err_out;
 116
 117         /*
 118          * currently only base flavor "plain" can have bulk specification.
 119          */
 120         if (flvr->sf_rpc == SPTLRPC_FLVR_PLAIN) {
 121                 flvr->u_bulk.hash.hash_alg = BULK_HASH_ALG_ADLER32;
 122                 if (bulk) {
 123                         /*
 124                          * format: plain-hash:<hash_alg>
 125                          */
 126                         alg = strchr(bulk, ':');
 127                         if (alg == NULL)
 128                                 goto err_out;
 129                         *alg++ = '\0';
 130
 131                         if (strcmp(bulk, "hash"))
 132                                 goto err_out;
 133
 134                         flvr->u_bulk.hash.hash_alg = sptlrpc_get_hash_alg(alg);
 135                         if (flvr->u_bulk.hash.hash_alg >= BULK_HASH_ALG_MAX)
 136                                 goto err_out;
 137                 }
 138
 139                 if (flvr->u_bulk.hash.hash_alg == BULK_HASH_ALG_NULL)
 140                         flvr_set_bulk_svc(&flvr->sf_rpc, SPTLRPC_BULK_SVC_NULL);
 141                 else
 142                         flvr_set_bulk_svc(&flvr->sf_rpc, SPTLRPC_BULK_SVC_INTG);
 143         } else {
 144                 if (bulk)
 145                         goto err_out;
 146         }
 147
 148         flvr->sf_flags = 0;
 149         return 0;
 150
 151 err_out:
 152         CERROR("invalid flavor string: %s\n", str);
 153         return -EINVAL;
 154 }
 155 EXPORT_SYMBOL(sptlrpc_parse_flavor);
 156
 157 /****************************************
 158  * configure rules                      *
 159  ****************************************/
 160
 161 static void get_default_flavor(struct sptlrpc_flavor *sf)
 162 {
 163         memset(sf, 0, sizeof(*sf));
 164
 165         sf->sf_rpc = SPTLRPC_FLVR_NULL;
 166         sf->sf_flags = 0;
 167 }
 168
 169 static void sptlrpc_rule_init(struct sptlrpc_rule *rule)
 170 {
 171         rule->sr_netid = LNET_NIDNET(LNET_NID_ANY);
 172         rule->sr_from = LUSTRE_SP_ANY;
 173         rule->sr_to = LUSTRE_SP_ANY;
 174         rule->sr_padding = 0;
 175
 176         get_default_flavor(&rule->sr_flvr);
 177 }
 178
 179 /*
 180  * format: network[.direction]=flavor
 181  */
 182 int sptlrpc_parse_rule(char *param, struct sptlrpc_rule *rule)
 183 {
 184         char           *flavor, *dir;
 185         int             rc;
 186
 187         sptlrpc_rule_init(rule);
 188
 189         flavor = strchr(param, '=');
 190         if (flavor == NULL) {
 191                 CERROR("invalid param, no '='\n");
 192                 RETURN(-EINVAL);
 193         }
 194         *flavor++ = '\0';
 195
 196         dir = strchr(param, '.');
 197         if (dir)
 198                 *dir++ = '\0';
 199
 200         /* 1.1 network */
 201         if (strcmp(param, "default")) {
 202                 rule->sr_netid = libcfs_str2net(param);
 203                 if (rule->sr_netid == LNET_NIDNET(LNET_NID_ANY)) {
 204                         CERROR("invalid network name: %s\n", param);
 205                         RETURN(-EINVAL);
 206                 }
 207         }
 208
 209         /* 1.2 direction */
 210         if (dir) {
 211                 if (!strcmp(dir, "mdt2ost")) {
 212                         rule->sr_from = LUSTRE_SP_MDT;
 213                         rule->sr_to = LUSTRE_SP_OST;
 214                 } else if (!strcmp(dir, "mdt2mdt")) {
 215                         rule->sr_from = LUSTRE_SP_MDT;
 216                         rule->sr_to = LUSTRE_SP_MDT;
 217                 } else if (!strcmp(dir, "cli2ost")) {
 218                         rule->sr_from = LUSTRE_SP_CLI;
 219                         rule->sr_to = LUSTRE_SP_OST;
 220                 } else if (!strcmp(dir, "cli2mdt")) {
 221                         rule->sr_from = LUSTRE_SP_CLI;
 222                         rule->sr_to = LUSTRE_SP_MDT;
 223                 } else {
 224                         CERROR("invalid rule dir segment: %s\n", dir);
 225                         RETURN(-EINVAL);
 226                 }
 227         }
 228
 229         /* 2.1 flavor */
 230         rc = sptlrpc_parse_flavor(flavor, &rule->sr_flvr);
 231         if (rc)
 232                 RETURN(-EINVAL);
 233
 234         RETURN(0);
 235 }
 236 EXPORT_SYMBOL(sptlrpc_parse_rule);
 237
 238 void sptlrpc_rule_set_free(struct sptlrpc_rule_set *rset)
 239 {
 240         LASSERT(rset->srs_nslot ||
 241                 (rset->srs_nrule == 0 && rset->srs_rules == NULL));
 242
 243         if (rset->srs_nslot) {
 244                 OBD_FREE(rset->srs_rules,
 245                          rset->srs_nslot * sizeof(*rset->srs_rules));
 246                 sptlrpc_rule_set_init(rset);
 247         }
 248 }
 249 EXPORT_SYMBOL(sptlrpc_rule_set_free);
 250
 251 /*
 252  * return 0 if the rule set could accomodate one more rule.
 253  */
 254 int sptlrpc_rule_set_expand(struct sptlrpc_rule_set *rset)
 255 {
 256         struct sptlrpc_rule *rules;
 257         int nslot;
 258
 259         might_sleep();
 260
 261         if (rset->srs_nrule < rset->srs_nslot)
 262                 return 0;
 263
 264         nslot = rset->srs_nslot + 8;
 265
 266         /* better use realloc() if available */
 267         OBD_ALLOC(rules, nslot * sizeof(*rset->srs_rules));
 268         if (rules == NULL)
 269                 return -ENOMEM;
 270
 271         if (rset->srs_nrule) {
 272                 LASSERT(rset->srs_nslot && rset->srs_rules);
 273                 memcpy(rules, rset->srs_rules,
 274                        rset->srs_nrule * sizeof(*rset->srs_rules));
 275
 276                 OBD_FREE(rset->srs_rules,
 277                          rset->srs_nslot * sizeof(*rset->srs_rules));
 278         }
 279
 280         rset->srs_rules = rules;
 281         rset->srs_nslot = nslot;
 282         return 0;
 283 }
 284
 285 static inline int rule_spec_dir(struct sptlrpc_rule *rule)
 286 {
 287         return (rule->sr_from != LUSTRE_SP_ANY ||
 288                 rule->sr_to != LUSTRE_SP_ANY);
 289 }
 290 static inline int rule_spec_net(struct sptlrpc_rule *rule)
 291 {
 292         return (rule->sr_netid != LNET_NIDNET(LNET_NID_ANY));
 293 }
 294 static inline int rule_match_dir(struct sptlrpc_rule *r1,
 295                                  struct sptlrpc_rule *r2)
 296 {
 297         return (r1->sr_from == r2->sr_from && r1->sr_to == r2->sr_to);
 298 }
 299 static inline int rule_match_net(struct sptlrpc_rule *r1,
 300                                  struct sptlrpc_rule *r2)
 301 {
 302         return (r1->sr_netid == r2->sr_netid);
 303 }
 304
 305 /*
 306  * merge @rule into @rset.
 307  * the @rset slots might be expanded.
 308  */
 309 int sptlrpc_rule_set_merge(struct sptlrpc_rule_set *rset,
 310                            struct sptlrpc_rule *rule)
 311 {
 312         struct sptlrpc_rule      *p = rset->srs_rules;
 313         int                       spec_dir, spec_net;
 314         int                       rc, n, match = 0;
 315
 316         might_sleep();
 317
 318         spec_net = rule_spec_net(rule);
 319         spec_dir = rule_spec_dir(rule);
 320
 321         for (n = 0; n < rset->srs_nrule; n++) {
 322                 p = &rset->srs_rules[n];
 323
 324                 /* test network match, if failed:
 325                  * - spec rule: skip rules which is also spec rule match, until
 326                  *   we hit a wild rule, which means no more chance
 327                  * - wild rule: skip until reach the one which is also wild
 328                  *   and matches
 329                  */
 330                 if (!rule_match_net(p, rule)) {
 331                         if (spec_net) {
 332                                 if (rule_spec_net(p))
 333                                         continue;
 334                                 else
 335                                         break;
 336                         } else {
 337                                 continue;
 338                         }
 339                 }
 340
 341                 /* test dir match, same logic as net matching */
 342                 if (!rule_match_dir(p, rule)) {
 343                         if (spec_dir) {
 344                                 if (rule_spec_dir(p))
 345                                         continue;
 346                                 else
 347                                         break;
 348                         } else {
 349                                 continue;
 350                         }
 351                 }
 352
 353                 /* find a match */
 354                 match = 1;
 355                 break;
 356         }
 357
 358         if (match) {
 359                 LASSERT(n >= 0 && n < rset->srs_nrule);
 360
 361                 if (rule->sr_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
 362                         /* remove this rule */
 363                         if (n < rset->srs_nrule - 1)
 364                                 memmove(&rset->srs_rules[n],
 365                                         &rset->srs_rules[n + 1],
 366                                         (rset->srs_nrule - n - 1) *
 367                                         sizeof(*rule));
 368                         rset->srs_nrule--;
 369                 } else {
 370                         /* override the rule */
 371                         memcpy(&rset->srs_rules[n], rule, sizeof(*rule));
 372                 }
 373         } else {
 374                 LASSERT(n >= 0 && n <= rset->srs_nrule);
 375
 376                 if (rule->sr_flvr.sf_rpc != SPTLRPC_FLVR_INVALID) {
 377                         rc = sptlrpc_rule_set_expand(rset);
 378                         if (rc)
 379                                 return rc;
 380
 381                         if (n < rset->srs_nrule)
 382                                 memmove(&rset->srs_rules[n + 1],
 383                                         &rset->srs_rules[n],
 384                                         (rset->srs_nrule - n) * sizeof(*rule));
 385                         memcpy(&rset->srs_rules[n], rule, sizeof(*rule));
 386                         rset->srs_nrule++;
 387                 } else {
 388                         CDEBUG(D_CONFIG, "ignore the unmatched deletion\n");
 389                 }
 390         }
 391
 392         return 0;
 393 }
 394 EXPORT_SYMBOL(sptlrpc_rule_set_merge);
 395
 396 /**
 397  * given from/to/nid, determine a matching flavor in ruleset.
 398  * return 1 if a match found, otherwise return 0.
 399  */
 400 int sptlrpc_rule_set_choose(struct sptlrpc_rule_set *rset,
 401                             enum lustre_sec_part from,
 402                             enum lustre_sec_part to,
 403                             lnet_nid_t nid,
 404                             struct sptlrpc_flavor *sf)
 405 {
 406         struct sptlrpc_rule    *r;
 407         int                     n;
 408
 409         for (n = 0; n < rset->srs_nrule; n++) {
 410                 r = &rset->srs_rules[n];
 411
 412                 if (LNET_NIDNET(nid) != LNET_NIDNET(LNET_NID_ANY) &&
 413                     r->sr_netid != LNET_NIDNET(LNET_NID_ANY) &&
 414                     LNET_NIDNET(nid) != r->sr_netid)
 415                         continue;
 416
 417                 if (from != LUSTRE_SP_ANY && r->sr_from != LUSTRE_SP_ANY &&
 418                     from != r->sr_from)
 419                         continue;
 420
 421                 if (to != LUSTRE_SP_ANY && r->sr_to != LUSTRE_SP_ANY &&
 422                     to != r->sr_to)
 423                         continue;
 424
 425                 *sf = r->sr_flvr;
 426                 return 1;
 427         }
 428
 429         return 0;
 430 }
 431
 432 void sptlrpc_rule_set_dump(struct sptlrpc_rule_set *rset)
 433 {
 434         struct sptlrpc_rule *r;
 435         int     n;
 436
 437         for (n = 0; n < rset->srs_nrule; n++) {
 438                 r = &rset->srs_rules[n];
 439                 CDEBUG(D_SEC, "<%02d> from %x to %x, net %x, rpc %x\n", n,
 440                        r->sr_from, r->sr_to, r->sr_netid, r->sr_flvr.sf_rpc);
 441         }
 442 }
 443
 444 static int sptlrpc_rule_set_extract(struct sptlrpc_rule_set *gen,
 445                                     struct sptlrpc_rule_set *tgt,
 446                                     enum lustre_sec_part from,
 447                                     enum lustre_sec_part to,
 448                                     struct sptlrpc_rule_set *rset)
 449 {
 450         struct sptlrpc_rule_set *src[2] = { gen, tgt };
 451         struct sptlrpc_rule     *rule;
 452         int                      i, n, rc;
 453
 454         might_sleep();
 455
 456         /* merge general rules firstly, then target-specific rules */
 457         for (i = 0; i < 2; i++) {
 458                 if (src[i] == NULL)
 459                         continue;
 460
 461                 for (n = 0; n < src[i]->srs_nrule; n++) {
 462                         rule = &src[i]->srs_rules[n];
 463
 464                         if (from != LUSTRE_SP_ANY &&
 465                             rule->sr_from != LUSTRE_SP_ANY &&
 466                             rule->sr_from != from)
 467                                 continue;
 468                         if (to != LUSTRE_SP_ANY &&
 469                             rule->sr_to != LUSTRE_SP_ANY &&
 470                             rule->sr_to != to)
 471                                 continue;
 472
 473                         rc = sptlrpc_rule_set_merge(rset, rule);
 474                         if (rc) {
 475                                 CERROR("can't merge: %d\n", rc);
 476                                 return rc;
 477                         }
 478                 }
 479         }
 480
 481         return 0;
 482 }
 483
 484 /**********************************
 485  * sptlrpc configuration support  *
 486  **********************************/
 487
 488 struct sptlrpc_conf_tgt {
 489         struct list_head              sct_list;
 490         char                    sct_name[MAX_OBD_NAME];
 491         struct sptlrpc_rule_set sct_rset;
 492 };
 493
 494 struct sptlrpc_conf {
 495         struct list_head        sc_list;
 496         char                    sc_fsname[MTI_NAME_MAXLEN];
 497         unsigned int            sc_modified;    /* modified during updating */
 498         unsigned int            sc_updated:1,   /* updated copy from MGS */
 499                                 sc_local:1;     /* local copy from target */
 500         struct sptlrpc_rule_set sc_rset;        /* fs general rules */
 501         struct list_head        sc_tgts;        /* target-specific rules */
 502 };
 503
 504 static struct mutex sptlrpc_conf_lock;
 505 static struct list_head sptlrpc_confs;
 506
 507 static void sptlrpc_conf_free_rsets(struct sptlrpc_conf *conf)
 508 {
 509         struct sptlrpc_conf_tgt *conf_tgt, *conf_tgt_next;
 510
 511         sptlrpc_rule_set_free(&conf->sc_rset);
 512
 513         list_for_each_entry_safe(conf_tgt, conf_tgt_next,
 514                                  &conf->sc_tgts, sct_list) {
 515                 sptlrpc_rule_set_free(&conf_tgt->sct_rset);
 516                 list_del(&conf_tgt->sct_list);
 517                 OBD_FREE_PTR(conf_tgt);
 518         }
 519         LASSERT(list_empty(&conf->sc_tgts));
 520
 521         conf->sc_updated = 0;
 522         conf->sc_local = 0;
 523 }
 524
 525 static void sptlrpc_conf_free(struct sptlrpc_conf *conf)
 526 {
 527         CDEBUG(D_SEC, "free sptlrpc conf %s\n", conf->sc_fsname);
 528
 529         sptlrpc_conf_free_rsets(conf);
 530         list_del(&conf->sc_list);
 531         OBD_FREE_PTR(conf);
 532 }
 533
 534 static
 535 struct sptlrpc_conf_tgt *sptlrpc_conf_get_tgt(struct sptlrpc_conf *conf,
 536                                               const char *name,
 537                                               int create)
 538 {
 539         struct sptlrpc_conf_tgt *conf_tgt;
 540
 541         list_for_each_entry(conf_tgt, &conf->sc_tgts, sct_list) {
 542                 if (strcmp(conf_tgt->sct_name, name) == 0)
 543                         return conf_tgt;
 544         }
 545
 546         if (!create)
 547                 return NULL;
 548
 549         OBD_ALLOC_PTR(conf_tgt);
 550         if (conf_tgt) {
 551                 strlcpy(conf_tgt->sct_name, name, sizeof(conf_tgt->sct_name));
 552                 sptlrpc_rule_set_init(&conf_tgt->sct_rset);
 553                 list_add(&conf_tgt->sct_list, &conf->sc_tgts);
 554         }
 555
 556         return conf_tgt;
 557 }
 558
 559 static
 560 struct sptlrpc_conf *sptlrpc_conf_get(const char *fsname,
 561                                       int create)
 562 {
 563         struct sptlrpc_conf *conf;
 564
 565         list_for_each_entry(conf, &sptlrpc_confs, sc_list) {
 566                 if (strcmp(conf->sc_fsname, fsname) == 0)
 567                         return conf;
 568         }
 569
 570         if (!create)
 571                 return NULL;
 572
 573         OBD_ALLOC_PTR(conf);
 574         if (conf == NULL)
 575                 return NULL;
 576
 577         if (strlcpy(conf->sc_fsname, fsname, sizeof(conf->sc_fsname)) >=
 578             sizeof(conf->sc_fsname)) {
 579                 OBD_FREE_PTR(conf);
 580                 return NULL;
 581         }
 582         sptlrpc_rule_set_init(&conf->sc_rset);
 583         INIT_LIST_HEAD(&conf->sc_tgts);
 584         list_add(&conf->sc_list, &sptlrpc_confs);
 585
 586         CDEBUG(D_SEC, "create sptlrpc conf %s\n", conf->sc_fsname);
 587         return conf;
 588 }
 589
 590 /**
 591  * caller must hold conf_lock already.
 592  */
 593 static int sptlrpc_conf_merge_rule(struct sptlrpc_conf *conf,
 594                                    const char *target,
 595                                    struct sptlrpc_rule *rule)
 596 {
 597         struct sptlrpc_conf_tgt  *conf_tgt;
 598         struct sptlrpc_rule_set  *rule_set;
 599
 600         /* fsname == target means general rules for the whole fs */
 601         if (strcmp(conf->sc_fsname, target) == 0) {
 602                 rule_set = &conf->sc_rset;
 603         } else {
 604                 conf_tgt = sptlrpc_conf_get_tgt(conf, target, 1);
 605                 if (conf_tgt) {
 606                         rule_set = &conf_tgt->sct_rset;
 607                 } else {
 608                         CERROR("out of memory, can't merge rule!\n");
 609                         return -ENOMEM;
 610                 }
 611         }
 612
 613         return sptlrpc_rule_set_merge(rule_set, rule);
 614 }
 615
 616 /**
 617  * process one LCFG_SPTLRPC_CONF record. if \a conf is NULL, we
 618  * find one through the target name in the record inside conf_lock;
 619  * otherwise means caller already hold conf_lock.
 620  */
 621 static int __sptlrpc_process_config(char *target, const char *fsname,
 622                                     struct sptlrpc_rule *rule,
 623                                     struct sptlrpc_conf *conf)
 624 {
 625         int rc;
 626
 627         ENTRY;
 628         if (!conf) {
 629                 if (!fsname)
 630                         return -ENODEV;
 631
 632                 mutex_lock(&sptlrpc_conf_lock);
 633                 conf = sptlrpc_conf_get(fsname, 0);
 634                 if (!conf) {
 635                         CERROR("can't find conf\n");
 636                         rc = -ENOMEM;
 637                 } else {
 638                         rc = sptlrpc_conf_merge_rule(conf, target, rule);
 639                 }
 640                 mutex_unlock(&sptlrpc_conf_lock);
 641         } else {
 642                 LASSERT(mutex_is_locked(&sptlrpc_conf_lock));
 643                 rc = sptlrpc_conf_merge_rule(conf, target, rule);
 644         }
 645
 646         if (!rc)
 647                 conf->sc_modified++;
 648
 649         RETURN(rc);
 650 }
 651
 652 int sptlrpc_process_config(struct lustre_cfg *lcfg)
 653 {
 654         char fsname[MTI_NAME_MAXLEN];
 655         struct sptlrpc_rule rule;
 656         char *target, *param;
 657         int rc;
 658
 659         print_lustre_cfg(lcfg);
 660
 661         target = lustre_cfg_string(lcfg, 1);
 662         if (!target) {
 663                 CERROR("missing target name\n");
 664                 return -EINVAL;
 665         }
 666
 667         param = lustre_cfg_string(lcfg, 2);
 668         if (!param) {
 669                 CERROR("missing parameter\n");
 670                 return -EINVAL;
 671         }
 672
 673         /* parse rule to make sure the format is correct */
 674         if (strncmp(param, PARAM_SRPC_FLVR,
 675                     sizeof(PARAM_SRPC_FLVR) - 1) != 0) {
 676                 CERROR("Invalid sptlrpc parameter: %s\n", param);
 677                 return -EINVAL;
 678         }
 679         param += sizeof(PARAM_SRPC_FLVR) - 1;
 680
 681         CDEBUG(D_SEC, "processing rule: %s.%s\n", target, param);
 682
 683         /*
 684          * Three types of targets exist for sptlrpc using conf_param
 685          * 1.   '_mgs' which targets mgc srpc settings. Treat it as
 686          *      as a special file system name.
 687          * 2.   target is a device which can be fsname-MDTXXXX or
 688          *      fsname-OSTXXXX. This can be verified by the function
 689          *      server_name2fsname.
 690          * 3.   If both above conditions are not meet then the target
 691          *      is a actual filesystem.
 692          */
 693         if (server_name2fsname(target, fsname, NULL))
 694                 strlcpy(fsname, target, sizeof(target));
 695
 696         rc = sptlrpc_parse_rule(param, &rule);
 697         if (rc)
 698                 return rc;
 699
 700         return __sptlrpc_process_config(target, fsname, &rule, NULL);
 701 }
 702 EXPORT_SYMBOL(sptlrpc_process_config);
 703
 704 static int logname2fsname(const char *logname, char *buf, int buflen)
 705 {
 706         char   *ptr;
 707         int     len;
 708
 709         ptr = strrchr(logname, '-');
 710         if (ptr == NULL || strcmp(ptr, "-sptlrpc")) {
 711                 CERROR("%s is not a sptlrpc config log\n", logname);
 712                 return -EINVAL;
 713         }
 714
 715         len = min((int) (ptr - logname), buflen - 1);
 716
 717         memcpy(buf, logname, len);
 718         buf[len] = '\0';
 719         return 0;
 720 }
 721
 722 void sptlrpc_conf_log_update_begin(const char *logname)
 723 {
 724         struct sptlrpc_conf *conf;
 725         char                 fsname[16];
 726
 727         if (logname2fsname(logname, fsname, sizeof(fsname)))
 728                 return;
 729
 730         mutex_lock(&sptlrpc_conf_lock);
 731
 732         conf = sptlrpc_conf_get(fsname, 0);
 733         if (conf) {
 734                 if (conf->sc_local) {
 735                         LASSERT(conf->sc_updated == 0);
 736                         sptlrpc_conf_free_rsets(conf);
 737                 }
 738                 conf->sc_modified = 0;
 739         }
 740
 741         mutex_unlock(&sptlrpc_conf_lock);
 742 }
 743 EXPORT_SYMBOL(sptlrpc_conf_log_update_begin);
 744
 745 /**
 746  * mark a config log has been updated
 747  */
 748 void sptlrpc_conf_log_update_end(const char *logname)
 749 {
 750         struct sptlrpc_conf *conf;
 751         char                 fsname[16];
 752
 753         if (logname2fsname(logname, fsname, sizeof(fsname)))
 754                 return;
 755
 756         mutex_lock(&sptlrpc_conf_lock);
 757
 758         conf = sptlrpc_conf_get(fsname, 0);
 759         if (conf) {
 760                 /*
 761                  * if original state is not updated, make sure the
 762                  * modified counter > 0 to enforce updating local copy.
 763                  */
 764                 if (conf->sc_updated == 0)
 765                         conf->sc_modified++;
 766
 767                 conf->sc_updated = 1;
 768         }
 769
 770         mutex_unlock(&sptlrpc_conf_lock);
 771 }
 772 EXPORT_SYMBOL(sptlrpc_conf_log_update_end);
 773
 774 void sptlrpc_conf_log_start(const char *logname)
 775 {
 776         char                 fsname[16];
 777
 778         if (logname2fsname(logname, fsname, sizeof(fsname)))
 779                 return;
 780
 781         mutex_lock(&sptlrpc_conf_lock);
 782         sptlrpc_conf_get(fsname, 1);
 783         mutex_unlock(&sptlrpc_conf_lock);
 784 }
 785 EXPORT_SYMBOL(sptlrpc_conf_log_start);
 786
 787 void sptlrpc_conf_log_stop(const char *logname)
 788 {
 789         struct sptlrpc_conf *conf;
 790         char                 fsname[16];
 791
 792         if (logname2fsname(logname, fsname, sizeof(fsname)))
 793                 return;
 794
 795         mutex_lock(&sptlrpc_conf_lock);
 796         conf = sptlrpc_conf_get(fsname, 0);
 797         if (conf)
 798                 sptlrpc_conf_free(conf);
 799         mutex_unlock(&sptlrpc_conf_lock);
 800 }
 801 EXPORT_SYMBOL(sptlrpc_conf_log_stop);
 802
 803 static void inline flavor_set_flags(struct sptlrpc_flavor *sf,
 804                                     enum lustre_sec_part from,
 805                                     enum lustre_sec_part to,
 806                                     unsigned int fl_udesc)
 807 {
 808         /*
 809          * null flavor doesn't need to set any flavor, and in fact
 810          * we'd better not do that because everybody share a single sec.
 811          */
 812         if (sf->sf_rpc == SPTLRPC_FLVR_NULL)
 813                 return;
 814
 815         if (from == LUSTRE_SP_MDT) {
 816                 /* MDT->MDT; MDT->OST */
 817                 sf->sf_flags |= PTLRPC_SEC_FL_ROOTONLY;
 818         } else if (from == LUSTRE_SP_CLI && to == LUSTRE_SP_OST) {
 819                 /* CLI->OST */
 820                 sf->sf_flags |= PTLRPC_SEC_FL_ROOTONLY | PTLRPC_SEC_FL_BULK;
 821         } else if (from == LUSTRE_SP_CLI && to == LUSTRE_SP_MDT) {
 822                 /* CLI->MDT */
 823                 if (fl_udesc && sf->sf_rpc != SPTLRPC_FLVR_NULL)
 824                         sf->sf_flags |= PTLRPC_SEC_FL_UDESC;
 825         }
 826
 827         /* Some flavors use a single uid (0) context */
 828         if (flvr_is_rootonly(sf->sf_rpc))
 829                 sf->sf_flags |= PTLRPC_SEC_FL_ROOTONLY;
 830
 831         /* User descriptor might need to be cleared */
 832         if (flvr_allows_user_desc(sf->sf_rpc) == 0)
 833                 sf->sf_flags &= ~PTLRPC_SEC_FL_UDESC;
 834 }
 835
 836 void sptlrpc_conf_choose_flavor(enum lustre_sec_part from,
 837                                 enum lustre_sec_part to,
 838                                 struct obd_uuid *target,
 839                                 lnet_nid_t nid,
 840                                 struct sptlrpc_flavor *sf)
 841 {
 842         struct sptlrpc_conf     *conf;
 843         struct sptlrpc_conf_tgt *conf_tgt;
 844         char                     name[MTI_NAME_MAXLEN];
 845         int                      len, rc = 0;
 846
 847         obd_uuid2fsname(name, target->uuid, sizeof(name));
 848
 849         mutex_lock(&sptlrpc_conf_lock);
 850
 851         conf = sptlrpc_conf_get(name, 0);
 852         if (conf == NULL)
 853                 goto out;
 854
 855         /* convert uuid name (supposed end with _UUID) to target name */
 856         len = strlen(target->uuid);
 857         LASSERT(len > 5);
 858         memcpy(name, target->uuid, len - 5);
 859         name[len - 5] = '\0';
 860
 861         conf_tgt = sptlrpc_conf_get_tgt(conf, name, 0);
 862         if (conf_tgt) {
 863                 rc = sptlrpc_rule_set_choose(&conf_tgt->sct_rset,
 864                                              from, to, nid, sf);
 865                 if (rc)
 866                         goto out;
 867         }
 868
 869         rc = sptlrpc_rule_set_choose(&conf->sc_rset, from, to, nid, sf);
 870 out:
 871         mutex_unlock(&sptlrpc_conf_lock);
 872
 873         if (rc == 0)
 874                 get_default_flavor(sf);
 875
 876         flavor_set_flags(sf, from, to, 1);
 877 }
 878
 879 /**
 880  * called by target devices, determine the expected flavor from
 881  * certain peer (from, nid).
 882  */
 883 void sptlrpc_target_choose_flavor(struct sptlrpc_rule_set *rset,
 884                                   enum lustre_sec_part from,
 885                                   lnet_nid_t nid,
 886                                   struct sptlrpc_flavor *sf)
 887 {
 888         if (sptlrpc_rule_set_choose(rset, from, LUSTRE_SP_ANY, nid, sf) == 0)
 889                 get_default_flavor(sf);
 890 }
 891
 892 #define SEC_ADAPT_DELAY         (10)
 893
 894 /**
 895  * called by client devices, notify the sptlrpc config has changed and
 896  * do import_sec_adapt later.
 897  */
 898 void sptlrpc_conf_client_adapt(struct obd_device *obd)
 899 {
 900         struct obd_import  *imp;
 901         ENTRY;
 902
 903         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0 ||
 904                 strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) == 0 ||
 905                 strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) == 0 ||
 906                 strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) == 0);
 907         CDEBUG(D_SEC, "obd %s\n", obd->u.cli.cl_target_uuid.uuid);
 908
 909         /* serialize with connect/disconnect import */
 910         down_read_nested(&obd->u.cli.cl_sem, OBD_CLI_SEM_MDCOSC);
 911
 912         imp = obd->u.cli.cl_import;
 913         if (imp) {
 914                 write_lock(&imp->imp_sec_lock);
 915                 if (imp->imp_sec)
 916                         imp->imp_sec_expire = ktime_get_real_seconds() +
 917                                 SEC_ADAPT_DELAY;
 918                 write_unlock(&imp->imp_sec_lock);
 919         }
 920
 921         up_read(&obd->u.cli.cl_sem);
 922         EXIT;
 923 }
 924 EXPORT_SYMBOL(sptlrpc_conf_client_adapt);
 925
 926 /**
 927  * called by target devices, extract sptlrpc rules which applies to
 928  * this target, to be used for future rpc flavor checking.
 929  */
 930 int sptlrpc_conf_target_get_rules(struct obd_device *obd,
 931                                   struct sptlrpc_rule_set *rset)
 932 {
 933         struct sptlrpc_conf *conf;
 934         struct sptlrpc_conf_tgt *conf_tgt;
 935         enum lustre_sec_part sp_dst;
 936         char fsname[MTI_NAME_MAXLEN];
 937         int rc = 0;
 938         ENTRY;
 939
 940         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDT_NAME) == 0) {
 941                 sp_dst = LUSTRE_SP_MDT;
 942         } else if (strcmp(obd->obd_type->typ_name, LUSTRE_OST_NAME) == 0) {
 943                 sp_dst = LUSTRE_SP_OST;
 944         } else {
 945                 CERROR("unexpected obd type %s\n", obd->obd_type->typ_name);
 946                 RETURN(-EINVAL);
 947         }
 948
 949         obd_uuid2fsname(fsname, obd->obd_uuid.uuid, sizeof(fsname));
 950
 951         mutex_lock(&sptlrpc_conf_lock);
 952         conf = sptlrpc_conf_get(fsname, 0);
 953         if (conf == NULL) {
 954                 CERROR("missing sptlrpc config log\n");
 955                 rc = -EFAULT;
 956         } else {
 957                 /* extract rule set for this target */
 958                 conf_tgt = sptlrpc_conf_get_tgt(conf, obd->obd_name, 0);
 959
 960                 rc = sptlrpc_rule_set_extract(&conf->sc_rset,
 961                                       conf_tgt ? &conf_tgt->sct_rset : NULL,
 962                                       LUSTRE_SP_ANY, sp_dst, rset);
 963         }
 964         mutex_unlock(&sptlrpc_conf_lock);
 965
 966         RETURN(rc);
 967 }
 968
 969 int  sptlrpc_conf_init(void)
 970 {
 971         INIT_LIST_HEAD(&sptlrpc_confs);
 972         mutex_init(&sptlrpc_conf_lock);
 973         return 0;
 974 }
 975
 976 void sptlrpc_conf_fini(void)
 977 {
 978         struct sptlrpc_conf  *conf, *conf_next;
 979
 980         mutex_lock(&sptlrpc_conf_lock);
 981         list_for_each_entry_safe(conf, conf_next, &sptlrpc_confs, sc_list)
 982                 sptlrpc_conf_free(conf);
 983         LASSERT(list_empty(&sptlrpc_confs));
 984         mutex_unlock(&sptlrpc_conf_lock);
 985 }