lustre/ptlrpc/sec_plain.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/sec_plain.c
  37  *
  38  * Author: Eric Mei <ericm@clusterfs.com>
  39  */
  40
  41 #ifndef EXPORT_SYMTAB
  42 # define EXPORT_SYMTAB
  43 #endif
  44 #define DEBUG_SUBSYSTEM S_SEC
  45
  46 #ifndef __KERNEL__
  47 #include <liblustre.h>
  48 #endif
  49
  50 #include <obd_support.h>
  51 #include <obd_cksum.h>
  52 #include <obd_class.h>
  53 #include <lustre_net.h>
  54 #include <lustre_sec.h>
  55
  56 struct plain_sec {
  57         struct ptlrpc_sec       pls_base;
  58         cfs_rwlock_t            pls_lock;
  59         struct ptlrpc_cli_ctx  *pls_ctx;
  60 };
  61
  62 static inline struct plain_sec *sec2plsec(struct ptlrpc_sec *sec)
  63 {
  64         return container_of(sec, struct plain_sec, pls_base);
  65 }
  66
  67 static struct ptlrpc_sec_policy plain_policy;
  68 static struct ptlrpc_ctx_ops    plain_ctx_ops;
  69 static struct ptlrpc_svc_ctx    plain_svc_ctx;
  70
  71 static unsigned int plain_at_offset;
  72
  73 /*
  74  * for simplicity, plain policy rpc use fixed layout.
  75  */
  76 #define PLAIN_PACK_SEGMENTS             (4)
  77
  78 #define PLAIN_PACK_HDR_OFF              (0)
  79 #define PLAIN_PACK_MSG_OFF              (1)
  80 #define PLAIN_PACK_USER_OFF             (2)
  81 #define PLAIN_PACK_BULK_OFF             (3)
  82
  83 #define PLAIN_FL_USER                   (0x01)
  84 #define PLAIN_FL_BULK                   (0x02)
  85
  86 struct plain_header {
  87         __u8            ph_ver;            /* 0 */
  88         __u8            ph_flags;
  89         __u8            ph_sp;             /* source */
  90         __u8            ph_bulk_hash_alg;  /* complete flavor desc */
  91         __u8            ph_pad[4];
  92 };
  93
  94 struct plain_bulk_token {
  95         __u8            pbt_hash[8];
  96 };
  97
  98 #define PLAIN_BSD_SIZE \
  99         (sizeof(struct ptlrpc_bulk_sec_desc) + sizeof(struct plain_bulk_token))
 100
 101 /****************************************
 102  * bulk checksum helpers                *
 103  ****************************************/
 104
 105 static int plain_unpack_bsd(struct lustre_msg *msg, int swabbed)
 106 {
 107         struct ptlrpc_bulk_sec_desc *bsd;
 108
 109         if (bulk_sec_desc_unpack(msg, PLAIN_PACK_BULK_OFF, swabbed))
 110                 return -EPROTO;
 111
 112         bsd = lustre_msg_buf(msg, PLAIN_PACK_BULK_OFF, PLAIN_BSD_SIZE);
 113         if (bsd == NULL) {
 114                 CERROR("bulk sec desc has short size %d\n",
 115                        lustre_msg_buflen(msg, PLAIN_PACK_BULK_OFF));
 116                 return -EPROTO;
 117         }
 118
 119         if (bsd->bsd_svc != SPTLRPC_BULK_SVC_NULL &&
 120             bsd->bsd_svc != SPTLRPC_BULK_SVC_INTG) {
 121                 CERROR("invalid bulk svc %u\n", bsd->bsd_svc);
 122                 return -EPROTO;
 123         }
 124
 125         return 0;
 126 }
 127
 128 static int plain_generate_bulk_csum(struct ptlrpc_bulk_desc *desc,
 129                                     __u8 hash_alg,
 130                                     struct plain_bulk_token *token)
 131 {
 132         if (hash_alg == BULK_HASH_ALG_NULL)
 133                 return 0;
 134
 135         memset(token->pbt_hash, 0, sizeof(token->pbt_hash));
 136         return sptlrpc_get_bulk_checksum(desc, hash_alg, token->pbt_hash,
 137                                          sizeof(token->pbt_hash));
 138 }
 139
 140 static int plain_verify_bulk_csum(struct ptlrpc_bulk_desc *desc,
 141                                   __u8 hash_alg,
 142                                   struct plain_bulk_token *tokenr)
 143 {
 144         struct plain_bulk_token tokenv;
 145         int                     rc;
 146
 147         if (hash_alg == BULK_HASH_ALG_NULL)
 148                 return 0;
 149
 150         memset(&tokenv.pbt_hash, 0, sizeof(tokenv.pbt_hash));
 151         rc = sptlrpc_get_bulk_checksum(desc, hash_alg, tokenv.pbt_hash,
 152                                        sizeof(tokenv.pbt_hash));
 153         if (rc)
 154                 return rc;
 155
 156         if (memcmp(tokenr->pbt_hash, tokenv.pbt_hash, sizeof(tokenr->pbt_hash)))
 157                 return -EACCES;
 158         return 0;
 159 }
 160
 161 #ifdef __KERNEL__
 162 static void corrupt_bulk_data(struct ptlrpc_bulk_desc *desc)
 163 {
 164         char           *ptr;
 165         unsigned int    off, i;
 166
 167         for (i = 0; i < desc->bd_iov_count; i++) {
 168                 if (desc->bd_iov[i].kiov_len == 0)
 169                         continue;
 170
 171                 ptr = cfs_kmap(desc->bd_iov[i].kiov_page);
 172                 off = desc->bd_iov[i].kiov_offset & ~CFS_PAGE_MASK;
 173                 ptr[off] ^= 0x1;
 174                 cfs_kunmap(desc->bd_iov[i].kiov_page);
 175                 return;
 176         }
 177 }
 178 #else
 179 static void corrupt_bulk_data(struct ptlrpc_bulk_desc *desc)
 180 {
 181         unsigned int    i;
 182
 183         for (i = 0; i < desc->bd_iov_count; i++) {
 184                 if (desc->bd_iov[i].iov_len == 0)
 185                         continue;
 186
 187                 ((char *)desc->bd_iov[i].iov_base)[i] ^= 0x1;
 188                 return;
 189         }
 190 }
 191 #endif /* __KERNEL__ */
 192
 193 /****************************************
 194  * cli_ctx apis                         *
 195  ****************************************/
 196
 197 static
 198 int plain_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
 199 {
 200         /* should never reach here */
 201         LBUG();
 202         return 0;
 203 }
 204
 205 static
 206 int plain_ctx_validate(struct ptlrpc_cli_ctx *ctx)
 207 {
 208         return 0;
 209 }
 210
 211 static
 212 int plain_ctx_sign(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
 213 {
 214         struct lustre_msg   *msg = req->rq_reqbuf;
 215         struct plain_header *phdr;
 216         ENTRY;
 217
 218         msg->lm_secflvr = req->rq_flvr.sf_rpc;
 219
 220         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, 0);
 221         phdr->ph_ver = 0;
 222         phdr->ph_flags = 0;
 223         phdr->ph_sp = ctx->cc_sec->ps_part;
 224         phdr->ph_bulk_hash_alg = req->rq_flvr.u_bulk.hash.hash_alg;
 225
 226         if (req->rq_pack_udesc)
 227                 phdr->ph_flags |= PLAIN_FL_USER;
 228         if (req->rq_pack_bulk)
 229                 phdr->ph_flags |= PLAIN_FL_BULK;
 230
 231         req->rq_reqdata_len = lustre_msg_size_v2(msg->lm_bufcount,
 232                                                  msg->lm_buflens);
 233         RETURN(0);
 234 }
 235
 236 static
 237 int plain_ctx_verify(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
 238 {
 239         struct lustre_msg   *msg = req->rq_repdata;
 240         struct plain_header *phdr;
 241         __u32                cksum;
 242         int                  swabbed;
 243         ENTRY;
 244
 245         if (msg->lm_bufcount != PLAIN_PACK_SEGMENTS) {
 246                 CERROR("unexpected reply buf count %u\n", msg->lm_bufcount);
 247                 RETURN(-EPROTO);
 248         }
 249
 250         swabbed = ptlrpc_rep_need_swab(req);
 251
 252         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, sizeof(*phdr));
 253         if (phdr == NULL) {
 254                 CERROR("missing plain header\n");
 255                 RETURN(-EPROTO);
 256         }
 257
 258         if (phdr->ph_ver != 0) {
 259                 CERROR("Invalid header version\n");
 260                 RETURN(-EPROTO);
 261         }
 262
 263         /* expect no user desc in reply */
 264         if (phdr->ph_flags & PLAIN_FL_USER) {
 265                 CERROR("Unexpected udesc flag in reply\n");
 266                 RETURN(-EPROTO);
 267         }
 268
 269         if (phdr->ph_bulk_hash_alg != req->rq_flvr.u_bulk.hash.hash_alg) {
 270                 CERROR("reply bulk flavor %u != %u\n", phdr->ph_bulk_hash_alg,
 271                        req->rq_flvr.u_bulk.hash.hash_alg);
 272                 RETURN(-EPROTO);
 273         }
 274
 275         if (unlikely(req->rq_early)) {
 276                 cksum = crc32_le(!(__u32) 0,
 277                                  lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0),
 278                                  lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF));
 279                 if (cksum != msg->lm_cksum) {
 280                         CWARN("early reply checksum mismatch: %08x != %08x\n",
 281                               cpu_to_le32(cksum), msg->lm_cksum);
 282                         RETURN(-EINVAL);
 283                 }
 284         } else {
 285                 /* whether we sent with bulk or not, we expect the same
 286                  * in reply, except for early reply */
 287                 if (!req->rq_early &&
 288                     !equi(req->rq_pack_bulk == 1,
 289                           phdr->ph_flags & PLAIN_FL_BULK)) {
 290                         CERROR("%s bulk checksum in reply\n",
 291                                req->rq_pack_bulk ? "Missing" : "Unexpected");
 292                         RETURN(-EPROTO);
 293                 }
 294
 295                 if (phdr->ph_flags & PLAIN_FL_BULK) {
 296                         if (plain_unpack_bsd(msg, swabbed))
 297                                 RETURN(-EPROTO);
 298                 }
 299         }
 300
 301         req->rq_repmsg = lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0);
 302         req->rq_replen = lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF);
 303         RETURN(0);
 304 }
 305
 306 static
 307 int plain_cli_wrap_bulk(struct ptlrpc_cli_ctx *ctx,
 308                         struct ptlrpc_request *req,
 309                         struct ptlrpc_bulk_desc *desc)
 310 {
 311         struct ptlrpc_bulk_sec_desc *bsd;
 312         struct plain_bulk_token     *token;
 313         int                          rc;
 314
 315         LASSERT(req->rq_pack_bulk);
 316         LASSERT(req->rq_reqbuf->lm_bufcount == PLAIN_PACK_SEGMENTS);
 317
 318         bsd = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 319         token = (struct plain_bulk_token *) bsd->bsd_data;
 320
 321         bsd->bsd_version = 0;
 322         bsd->bsd_flags = 0;
 323         bsd->bsd_type = SPTLRPC_BULK_DEFAULT;
 324         bsd->bsd_svc = SPTLRPC_FLVR_BULK_SVC(req->rq_flvr.sf_rpc);
 325
 326         if (bsd->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 327                 RETURN(0);
 328
 329         if (req->rq_bulk_read)
 330                 RETURN(0);
 331
 332         rc = plain_generate_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 333                                       token);
 334         if (rc) {
 335                 CERROR("bulk write: failed to compute checksum: %d\n", rc);
 336         } else {
 337                 /*
 338                  * for sending we only compute the wrong checksum instead
 339                  * of corrupting the data so it is still correct on a redo
 340                  */
 341                 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND) &&
 342                     req->rq_flvr.u_bulk.hash.hash_alg != BULK_HASH_ALG_NULL)
 343                         token->pbt_hash[0] ^= 0x1;
 344         }
 345
 346         return rc;
 347 }
 348
 349 static
 350 int plain_cli_unwrap_bulk(struct ptlrpc_cli_ctx *ctx,
 351                           struct ptlrpc_request *req,
 352                           struct ptlrpc_bulk_desc *desc)
 353 {
 354         struct ptlrpc_bulk_sec_desc *bsdv;
 355         struct plain_bulk_token     *tokenv;
 356         int                          rc;
 357 #ifdef __KERNEL__
 358         int                          i, nob;
 359 #endif
 360
 361         LASSERT(req->rq_pack_bulk);
 362         LASSERT(req->rq_reqbuf->lm_bufcount == PLAIN_PACK_SEGMENTS);
 363         LASSERT(req->rq_repdata->lm_bufcount == PLAIN_PACK_SEGMENTS);
 364
 365         bsdv = lustre_msg_buf(req->rq_repdata, PLAIN_PACK_BULK_OFF, 0);
 366         tokenv = (struct plain_bulk_token *) bsdv->bsd_data;
 367
 368         if (req->rq_bulk_write) {
 369                 if (bsdv->bsd_flags & BSD_FL_ERR)
 370                         return -EIO;
 371                 return 0;
 372         }
 373
 374 #ifdef __KERNEL__
 375         /* fix the actual data size */
 376         for (i = 0, nob = 0; i < desc->bd_iov_count; i++) {
 377                 if (desc->bd_iov[i].kiov_len + nob > desc->bd_nob_transferred) {
 378                         desc->bd_iov[i].kiov_len =
 379                                 desc->bd_nob_transferred - nob;
 380                 }
 381                 nob += desc->bd_iov[i].kiov_len;
 382         }
 383 #endif
 384
 385         rc = plain_verify_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 386                                     tokenv);
 387         if (rc)
 388                 CERROR("bulk read: client verify failed: %d\n", rc);
 389
 390         return rc;
 391 }
 392
 393 /****************************************
 394  * sec apis                             *
 395  ****************************************/
 396
 397 static
 398 struct ptlrpc_cli_ctx *plain_sec_install_ctx(struct plain_sec *plsec)
 399 {
 400         struct ptlrpc_cli_ctx  *ctx, *ctx_new;
 401
 402         OBD_ALLOC_PTR(ctx_new);
 403
 404         cfs_write_lock(&plsec->pls_lock);
 405
 406         ctx = plsec->pls_ctx;
 407         if (ctx) {
 408                 cfs_atomic_inc(&ctx->cc_refcount);
 409
 410                 if (ctx_new)
 411                         OBD_FREE_PTR(ctx_new);
 412         } else if (ctx_new) {
 413                 ctx = ctx_new;
 414
 415                 cfs_atomic_set(&ctx->cc_refcount, 1); /* for cache */
 416                 ctx->cc_sec = &plsec->pls_base;
 417                 ctx->cc_ops = &plain_ctx_ops;
 418                 ctx->cc_expire = 0;
 419                 ctx->cc_flags = PTLRPC_CTX_CACHED | PTLRPC_CTX_UPTODATE;
 420                 ctx->cc_vcred.vc_uid = 0;
 421                 cfs_spin_lock_init(&ctx->cc_lock);
 422                 CFS_INIT_LIST_HEAD(&ctx->cc_req_list);
 423                 CFS_INIT_LIST_HEAD(&ctx->cc_gc_chain);
 424
 425                 plsec->pls_ctx = ctx;
 426                 cfs_atomic_inc(&plsec->pls_base.ps_nctx);
 427                 cfs_atomic_inc(&plsec->pls_base.ps_refcount);
 428
 429                 cfs_atomic_inc(&ctx->cc_refcount); /* for caller */
 430         }
 431
 432         cfs_write_unlock(&plsec->pls_lock);
 433
 434         return ctx;
 435 }
 436
 437 static
 438 void plain_destroy_sec(struct ptlrpc_sec *sec)
 439 {
 440         struct plain_sec       *plsec = sec2plsec(sec);
 441         ENTRY;
 442
 443         LASSERT(sec->ps_policy == &plain_policy);
 444         LASSERT(sec->ps_import);
 445         LASSERT(cfs_atomic_read(&sec->ps_refcount) == 0);
 446         LASSERT(cfs_atomic_read(&sec->ps_nctx) == 0);
 447         LASSERT(plsec->pls_ctx == NULL);
 448
 449         class_import_put(sec->ps_import);
 450
 451         OBD_FREE_PTR(plsec);
 452         EXIT;
 453 }
 454
 455 static
 456 void plain_kill_sec(struct ptlrpc_sec *sec)
 457 {
 458         sec->ps_dying = 1;
 459 }
 460
 461 static
 462 struct ptlrpc_sec *plain_create_sec(struct obd_import *imp,
 463                                     struct ptlrpc_svc_ctx *svc_ctx,
 464                                     struct sptlrpc_flavor *sf)
 465 {
 466         struct plain_sec       *plsec;
 467         struct ptlrpc_sec      *sec;
 468         struct ptlrpc_cli_ctx  *ctx;
 469         ENTRY;
 470
 471         LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_PLAIN);
 472
 473         OBD_ALLOC_PTR(plsec);
 474         if (plsec == NULL)
 475                 RETURN(NULL);
 476
 477         /*
 478          * initialize plain_sec
 479          */
 480         cfs_rwlock_init(&plsec->pls_lock);
 481         plsec->pls_ctx = NULL;
 482
 483         sec = &plsec->pls_base;
 484         sec->ps_policy = &plain_policy;
 485         cfs_atomic_set(&sec->ps_refcount, 0);
 486         cfs_atomic_set(&sec->ps_nctx, 0);
 487         sec->ps_id = sptlrpc_get_next_secid();
 488         sec->ps_import = class_import_get(imp);
 489         sec->ps_flvr = *sf;
 490         cfs_spin_lock_init(&sec->ps_lock);
 491         CFS_INIT_LIST_HEAD(&sec->ps_gc_list);
 492         sec->ps_gc_interval = 0;
 493         sec->ps_gc_next = 0;
 494
 495         /* install ctx immediately if this is a reverse sec */
 496         if (svc_ctx) {
 497                 ctx = plain_sec_install_ctx(plsec);
 498                 if (ctx == NULL) {
 499                         plain_destroy_sec(sec);
 500                         RETURN(NULL);
 501                 }
 502                 sptlrpc_cli_ctx_put(ctx, 1);
 503         }
 504
 505         RETURN(sec);
 506 }
 507
 508 static
 509 struct ptlrpc_cli_ctx *plain_lookup_ctx(struct ptlrpc_sec *sec,
 510                                         struct vfs_cred *vcred,
 511                                         int create, int remove_dead)
 512 {
 513         struct plain_sec       *plsec = sec2plsec(sec);
 514         struct ptlrpc_cli_ctx  *ctx;
 515         ENTRY;
 516
 517         cfs_read_lock(&plsec->pls_lock);
 518         ctx = plsec->pls_ctx;
 519         if (ctx)
 520                 cfs_atomic_inc(&ctx->cc_refcount);
 521         cfs_read_unlock(&plsec->pls_lock);
 522
 523         if (unlikely(ctx == NULL))
 524                 ctx = plain_sec_install_ctx(plsec);
 525
 526         RETURN(ctx);
 527 }
 528
 529 static
 530 void plain_release_ctx(struct ptlrpc_sec *sec,
 531                        struct ptlrpc_cli_ctx *ctx, int sync)
 532 {
 533         LASSERT(cfs_atomic_read(&sec->ps_refcount) > 0);
 534         LASSERT(cfs_atomic_read(&sec->ps_nctx) > 0);
 535         LASSERT(cfs_atomic_read(&ctx->cc_refcount) == 0);
 536         LASSERT(ctx->cc_sec == sec);
 537
 538         OBD_FREE_PTR(ctx);
 539
 540         cfs_atomic_dec(&sec->ps_nctx);
 541         sptlrpc_sec_put(sec);
 542 }
 543
 544 static
 545 int plain_flush_ctx_cache(struct ptlrpc_sec *sec,
 546                           uid_t uid, int grace, int force)
 547 {
 548         struct plain_sec       *plsec = sec2plsec(sec);
 549         struct ptlrpc_cli_ctx  *ctx;
 550         ENTRY;
 551
 552         /* do nothing unless caller want to flush for 'all' */
 553         if (uid != -1)
 554                 RETURN(0);
 555
 556         cfs_write_lock(&plsec->pls_lock);
 557         ctx = plsec->pls_ctx;
 558         plsec->pls_ctx = NULL;
 559         cfs_write_unlock(&plsec->pls_lock);
 560
 561         if (ctx)
 562                 sptlrpc_cli_ctx_put(ctx, 1);
 563         RETURN(0);
 564 }
 565
 566 static
 567 int plain_alloc_reqbuf(struct ptlrpc_sec *sec,
 568                        struct ptlrpc_request *req,
 569                        int msgsize)
 570 {
 571         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 572         int   alloc_len;
 573         ENTRY;
 574
 575         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 576         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 577
 578         if (req->rq_pack_udesc)
 579                 buflens[PLAIN_PACK_USER_OFF] = sptlrpc_current_user_desc_size();
 580
 581         if (req->rq_pack_bulk) {
 582                 LASSERT(req->rq_bulk_read || req->rq_bulk_write);
 583                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 584         }
 585
 586         alloc_len = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 587
 588         if (!req->rq_reqbuf) {
 589                 LASSERT(!req->rq_pool);
 590
 591                 alloc_len = size_roundup_power2(alloc_len);
 592                 OBD_ALLOC_LARGE(req->rq_reqbuf, alloc_len);
 593                 if (!req->rq_reqbuf)
 594                         RETURN(-ENOMEM);
 595
 596                 req->rq_reqbuf_len = alloc_len;
 597         } else {
 598                 LASSERT(req->rq_pool);
 599                 LASSERT(req->rq_reqbuf_len >= alloc_len);
 600                 memset(req->rq_reqbuf, 0, alloc_len);
 601         }
 602
 603         lustre_init_msg_v2(req->rq_reqbuf, PLAIN_PACK_SEGMENTS, buflens, NULL);
 604         req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0);
 605
 606         if (req->rq_pack_udesc)
 607                 sptlrpc_pack_user_desc(req->rq_reqbuf, PLAIN_PACK_USER_OFF);
 608
 609         RETURN(0);
 610 }
 611
 612 static
 613 void plain_free_reqbuf(struct ptlrpc_sec *sec,
 614                        struct ptlrpc_request *req)
 615 {
 616         ENTRY;
 617         if (!req->rq_pool) {
 618                 OBD_FREE_LARGE(req->rq_reqbuf, req->rq_reqbuf_len);
 619                 req->rq_reqbuf = NULL;
 620                 req->rq_reqbuf_len = 0;
 621         }
 622         EXIT;
 623 }
 624
 625 static
 626 int plain_alloc_repbuf(struct ptlrpc_sec *sec,
 627                        struct ptlrpc_request *req,
 628                        int msgsize)
 629 {
 630         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 631         int alloc_len;
 632         ENTRY;
 633
 634         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 635         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 636
 637         if (req->rq_pack_bulk) {
 638                 LASSERT(req->rq_bulk_read || req->rq_bulk_write);
 639                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 640         }
 641
 642         alloc_len = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 643
 644         /* add space for early reply */
 645         alloc_len += plain_at_offset;
 646
 647         alloc_len = size_roundup_power2(alloc_len);
 648
 649         OBD_ALLOC_LARGE(req->rq_repbuf, alloc_len);
 650         if (!req->rq_repbuf)
 651                 RETURN(-ENOMEM);
 652
 653         req->rq_repbuf_len = alloc_len;
 654         RETURN(0);
 655 }
 656
 657 static
 658 void plain_free_repbuf(struct ptlrpc_sec *sec,
 659                        struct ptlrpc_request *req)
 660 {
 661         ENTRY;
 662         OBD_FREE_LARGE(req->rq_repbuf, req->rq_repbuf_len);
 663         req->rq_repbuf = NULL;
 664         req->rq_repbuf_len = 0;
 665         EXIT;
 666 }
 667
 668 static
 669 int plain_enlarge_reqbuf(struct ptlrpc_sec *sec,
 670                          struct ptlrpc_request *req,
 671                          int segment, int newsize)
 672 {
 673         struct lustre_msg      *newbuf;
 674         int                     oldsize;
 675         int                     newmsg_size, newbuf_size;
 676         ENTRY;
 677
 678         LASSERT(req->rq_reqbuf);
 679         LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
 680         LASSERT(lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0) ==
 681                 req->rq_reqmsg);
 682
 683         /* compute new embedded msg size.  */
 684         oldsize = req->rq_reqmsg->lm_buflens[segment];
 685         req->rq_reqmsg->lm_buflens[segment] = newsize;
 686         newmsg_size = lustre_msg_size_v2(req->rq_reqmsg->lm_bufcount,
 687                                          req->rq_reqmsg->lm_buflens);
 688         req->rq_reqmsg->lm_buflens[segment] = oldsize;
 689
 690         /* compute new wrapper msg size.  */
 691         oldsize = req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF];
 692         req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF] = newmsg_size;
 693         newbuf_size = lustre_msg_size_v2(req->rq_reqbuf->lm_bufcount,
 694                                          req->rq_reqbuf->lm_buflens);
 695         req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF] = oldsize;
 696
 697         /* request from pool should always have enough buffer */
 698         LASSERT(!req->rq_pool || req->rq_reqbuf_len >= newbuf_size);
 699
 700         if (req->rq_reqbuf_len < newbuf_size) {
 701                 newbuf_size = size_roundup_power2(newbuf_size);
 702
 703                 OBD_ALLOC_LARGE(newbuf, newbuf_size);
 704                 if (newbuf == NULL)
 705                         RETURN(-ENOMEM);
 706
 707                 memcpy(newbuf, req->rq_reqbuf, req->rq_reqbuf_len);
 708
 709                 OBD_FREE_LARGE(req->rq_reqbuf, req->rq_reqbuf_len);
 710                 req->rq_reqbuf = newbuf;
 711                 req->rq_reqbuf_len = newbuf_size;
 712                 req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf,
 713                                                 PLAIN_PACK_MSG_OFF, 0);
 714         }
 715
 716         _sptlrpc_enlarge_msg_inplace(req->rq_reqbuf, PLAIN_PACK_MSG_OFF,
 717                                      newmsg_size);
 718         _sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
 719
 720         req->rq_reqlen = newmsg_size;
 721         RETURN(0);
 722 }
 723
 724 /****************************************
 725  * service apis                         *
 726  ****************************************/
 727
 728 static struct ptlrpc_svc_ctx plain_svc_ctx = {
 729         .sc_refcount    = CFS_ATOMIC_INIT(1),
 730         .sc_policy      = &plain_policy,
 731 };
 732
 733 static
 734 int plain_accept(struct ptlrpc_request *req)
 735 {
 736         struct lustre_msg   *msg = req->rq_reqbuf;
 737         struct plain_header *phdr;
 738         int                  swabbed;
 739         ENTRY;
 740
 741         LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
 742                 SPTLRPC_POLICY_PLAIN);
 743
 744         if (SPTLRPC_FLVR_BASE(req->rq_flvr.sf_rpc) !=
 745             SPTLRPC_FLVR_BASE(SPTLRPC_FLVR_PLAIN) ||
 746             SPTLRPC_FLVR_BULK_TYPE(req->rq_flvr.sf_rpc) !=
 747             SPTLRPC_FLVR_BULK_TYPE(SPTLRPC_FLVR_PLAIN)) {
 748                 CERROR("Invalid rpc flavor %x\n", req->rq_flvr.sf_rpc);
 749                 RETURN(SECSVC_DROP);
 750         }
 751
 752         if (msg->lm_bufcount < PLAIN_PACK_SEGMENTS) {
 753                 CERROR("unexpected request buf count %u\n", msg->lm_bufcount);
 754                 RETURN(SECSVC_DROP);
 755         }
 756
 757         swabbed = ptlrpc_req_need_swab(req);
 758
 759         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, sizeof(*phdr));
 760         if (phdr == NULL) {
 761                 CERROR("missing plain header\n");
 762                 RETURN(-EPROTO);
 763         }
 764
 765         if (phdr->ph_ver != 0) {
 766                 CERROR("Invalid header version\n");
 767                 RETURN(-EPROTO);
 768         }
 769
 770         if (phdr->ph_bulk_hash_alg >= BULK_HASH_ALG_MAX) {
 771                 CERROR("invalid hash algorithm: %u\n", phdr->ph_bulk_hash_alg);
 772                 RETURN(-EPROTO);
 773         }
 774
 775         req->rq_sp_from = phdr->ph_sp;
 776         req->rq_flvr.u_bulk.hash.hash_alg = phdr->ph_bulk_hash_alg;
 777
 778         if (phdr->ph_flags & PLAIN_FL_USER) {
 779                 if (sptlrpc_unpack_user_desc(msg, PLAIN_PACK_USER_OFF,
 780                                              swabbed)) {
 781                         CERROR("Mal-formed user descriptor\n");
 782                         RETURN(SECSVC_DROP);
 783                 }
 784
 785                 req->rq_pack_udesc = 1;
 786                 req->rq_user_desc = lustre_msg_buf(msg, PLAIN_PACK_USER_OFF, 0);
 787         }
 788
 789         if (phdr->ph_flags & PLAIN_FL_BULK) {
 790                 if (plain_unpack_bsd(msg, swabbed))
 791                         RETURN(SECSVC_DROP);
 792
 793                 req->rq_pack_bulk = 1;
 794         }
 795
 796         req->rq_reqmsg = lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0);
 797         req->rq_reqlen = msg->lm_buflens[PLAIN_PACK_MSG_OFF];
 798
 799         req->rq_svc_ctx = &plain_svc_ctx;
 800         cfs_atomic_inc(&req->rq_svc_ctx->sc_refcount);
 801
 802         RETURN(SECSVC_OK);
 803 }
 804
 805 static
 806 int plain_alloc_rs(struct ptlrpc_request *req, int msgsize)
 807 {
 808         struct ptlrpc_reply_state   *rs;
 809         __u32                        buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 810         int                          rs_size = sizeof(*rs);
 811         ENTRY;
 812
 813         LASSERT(msgsize % 8 == 0);
 814
 815         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 816         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 817
 818         if (req->rq_pack_bulk && (req->rq_bulk_read || req->rq_bulk_write))
 819                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 820
 821         rs_size += lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 822
 823         rs = req->rq_reply_state;
 824
 825         if (rs) {
 826                 /* pre-allocated */
 827                 LASSERT(rs->rs_size >= rs_size);
 828         } else {
 829                 OBD_ALLOC_LARGE(rs, rs_size);
 830                 if (rs == NULL)
 831                         RETURN(-ENOMEM);
 832
 833                 rs->rs_size = rs_size;
 834         }
 835
 836         rs->rs_svc_ctx = req->rq_svc_ctx;
 837         cfs_atomic_inc(&req->rq_svc_ctx->sc_refcount);
 838         rs->rs_repbuf = (struct lustre_msg *) (rs + 1);
 839         rs->rs_repbuf_len = rs_size - sizeof(*rs);
 840
 841         lustre_init_msg_v2(rs->rs_repbuf, PLAIN_PACK_SEGMENTS, buflens, NULL);
 842         rs->rs_msg = lustre_msg_buf_v2(rs->rs_repbuf, PLAIN_PACK_MSG_OFF, 0);
 843
 844         req->rq_reply_state = rs;
 845         RETURN(0);
 846 }
 847
 848 static
 849 void plain_free_rs(struct ptlrpc_reply_state *rs)
 850 {
 851         ENTRY;
 852
 853         LASSERT(cfs_atomic_read(&rs->rs_svc_ctx->sc_refcount) > 1);
 854         cfs_atomic_dec(&rs->rs_svc_ctx->sc_refcount);
 855
 856         if (!rs->rs_prealloc)
 857                 OBD_FREE_LARGE(rs, rs->rs_size);
 858         EXIT;
 859 }
 860
 861 static
 862 int plain_authorize(struct ptlrpc_request *req)
 863 {
 864         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 865         struct lustre_msg_v2      *msg = rs->rs_repbuf;
 866         struct plain_header       *phdr;
 867         int                        len;
 868         ENTRY;
 869
 870         LASSERT(rs);
 871         LASSERT(msg);
 872
 873         if (req->rq_replen != msg->lm_buflens[PLAIN_PACK_MSG_OFF])
 874                 len = lustre_shrink_msg(msg, PLAIN_PACK_MSG_OFF,
 875                                         req->rq_replen, 1);
 876         else
 877                 len = lustre_msg_size_v2(msg->lm_bufcount, msg->lm_buflens);
 878
 879         msg->lm_secflvr = req->rq_flvr.sf_rpc;
 880
 881         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, 0);
 882         phdr->ph_ver = 0;
 883         phdr->ph_flags = 0;
 884         phdr->ph_bulk_hash_alg = req->rq_flvr.u_bulk.hash.hash_alg;
 885
 886         if (req->rq_pack_bulk)
 887                 phdr->ph_flags |= PLAIN_FL_BULK;
 888
 889         rs->rs_repdata_len = len;
 890
 891         if (likely(req->rq_packed_final)) {
 892                 if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
 893                         req->rq_reply_off = plain_at_offset;
 894                 else
 895                         req->rq_reply_off = 0;
 896         } else {
 897                 msg->lm_cksum = crc32_le(!(__u32) 0,
 898                                 lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0),
 899                                 lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF));
 900                 req->rq_reply_off = 0;
 901         }
 902
 903         RETURN(0);
 904 }
 905
 906 static
 907 int plain_svc_unwrap_bulk(struct ptlrpc_request *req,
 908                           struct ptlrpc_bulk_desc *desc)
 909 {
 910         struct ptlrpc_reply_state   *rs = req->rq_reply_state;
 911         struct ptlrpc_bulk_sec_desc *bsdr, *bsdv;
 912         struct plain_bulk_token     *tokenr;
 913         int                          rc;
 914
 915         LASSERT(req->rq_bulk_write);
 916         LASSERT(req->rq_pack_bulk);
 917
 918         bsdr = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 919         tokenr = (struct plain_bulk_token *) bsdr->bsd_data;
 920         bsdv = lustre_msg_buf(rs->rs_repbuf, PLAIN_PACK_BULK_OFF, 0);
 921
 922         bsdv->bsd_version = 0;
 923         bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
 924         bsdv->bsd_svc = bsdr->bsd_svc;
 925         bsdv->bsd_flags = 0;
 926
 927         if (bsdr->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 928                 return 0;
 929
 930         rc = plain_verify_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 931                                     tokenr);
 932         if (rc) {
 933                 bsdv->bsd_flags |= BSD_FL_ERR;
 934                 CERROR("bulk write: server verify failed: %d\n", rc);
 935         }
 936
 937         return rc;
 938 }
 939
 940 static
 941 int plain_svc_wrap_bulk(struct ptlrpc_request *req,
 942                         struct ptlrpc_bulk_desc *desc)
 943 {
 944         struct ptlrpc_reply_state   *rs = req->rq_reply_state;
 945         struct ptlrpc_bulk_sec_desc *bsdr, *bsdv;
 946         struct plain_bulk_token     *tokenv;
 947         int                          rc;
 948
 949         LASSERT(req->rq_bulk_read);
 950         LASSERT(req->rq_pack_bulk);
 951
 952         bsdr = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 953         bsdv = lustre_msg_buf(rs->rs_repbuf, PLAIN_PACK_BULK_OFF, 0);
 954         tokenv = (struct plain_bulk_token *) bsdv->bsd_data;
 955
 956         bsdv->bsd_version = 0;
 957         bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
 958         bsdv->bsd_svc = bsdr->bsd_svc;
 959         bsdv->bsd_flags = 0;
 960
 961         if (bsdr->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 962                 return 0;
 963
 964         rc = plain_generate_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 965                                       tokenv);
 966         if (rc) {
 967                 CERROR("bulk read: server failed to compute "
 968                        "checksum: %d\n", rc);
 969         } else {
 970                 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))
 971                         corrupt_bulk_data(desc);
 972         }
 973
 974         return rc;
 975 }
 976
 977 static struct ptlrpc_ctx_ops plain_ctx_ops = {
 978         .refresh                = plain_ctx_refresh,
 979         .validate               = plain_ctx_validate,
 980         .sign                   = plain_ctx_sign,
 981         .verify                 = plain_ctx_verify,
 982         .wrap_bulk              = plain_cli_wrap_bulk,
 983         .unwrap_bulk            = plain_cli_unwrap_bulk,
 984 };
 985
 986 static struct ptlrpc_sec_cops plain_sec_cops = {
 987         .create_sec             = plain_create_sec,
 988         .destroy_sec            = plain_destroy_sec,
 989         .kill_sec               = plain_kill_sec,
 990         .lookup_ctx             = plain_lookup_ctx,
 991         .release_ctx            = plain_release_ctx,
 992         .flush_ctx_cache        = plain_flush_ctx_cache,
 993         .alloc_reqbuf           = plain_alloc_reqbuf,
 994         .free_reqbuf            = plain_free_reqbuf,
 995         .alloc_repbuf           = plain_alloc_repbuf,
 996         .free_repbuf            = plain_free_repbuf,
 997         .enlarge_reqbuf         = plain_enlarge_reqbuf,
 998 };
 999
1000 static struct ptlrpc_sec_sops plain_sec_sops = {
1001         .accept                 = plain_accept,
1002         .alloc_rs               = plain_alloc_rs,
1003         .authorize              = plain_authorize,
1004         .free_rs                = plain_free_rs,
1005         .unwrap_bulk            = plain_svc_unwrap_bulk,
1006         .wrap_bulk              = plain_svc_wrap_bulk,
1007 };
1008
1009 static struct ptlrpc_sec_policy plain_policy = {
1010         .sp_owner               = THIS_MODULE,
1011         .sp_name                = "plain",
1012         .sp_policy              = SPTLRPC_POLICY_PLAIN,
1013         .sp_cops                = &plain_sec_cops,
1014         .sp_sops                = &plain_sec_sops,
1015 };
1016
1017 int sptlrpc_plain_init(void)
1018 {
1019         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
1020         int rc;
1021
1022         buflens[PLAIN_PACK_MSG_OFF] = lustre_msg_early_size();
1023         plain_at_offset = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
1024
1025         rc = sptlrpc_register_policy(&plain_policy);
1026         if (rc)
1027                 CERROR("failed to register: %d\n", rc);
1028
1029         return rc;
1030 }
1031
1032 void sptlrpc_plain_fini(void)
1033 {
1034         int rc;
1035
1036         rc = sptlrpc_unregister_policy(&plain_policy);
1037         if (rc)
1038                 CERROR("cannot unregister: %d\n", rc);
1039 }