drivers/staging/lustre/lustre/ptlrpc/sec_plain.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/sec_plain.c
  37  *
  38  * Author: Eric Mei <ericm@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_SEC
  42
  43 #include "../include/obd_support.h"
  44 #include "../include/obd_cksum.h"
  45 #include "../include/obd_class.h"
  46 #include "../include/lustre_net.h"
  47 #include "../include/lustre_sec.h"
  48 #include "ptlrpc_internal.h"
  49
  50 struct plain_sec {
  51         struct ptlrpc_sec       pls_base;
  52         rwlock_t            pls_lock;
  53         struct ptlrpc_cli_ctx  *pls_ctx;
  54 };
  55
  56 static inline struct plain_sec *sec2plsec(struct ptlrpc_sec *sec)
  57 {
  58         return container_of(sec, struct plain_sec, pls_base);
  59 }
  60
  61 static struct ptlrpc_sec_policy plain_policy;
  62 static struct ptlrpc_ctx_ops    plain_ctx_ops;
  63 static struct ptlrpc_svc_ctx    plain_svc_ctx;
  64
  65 static unsigned int plain_at_offset;
  66
  67 /*
  68  * for simplicity, plain policy rpc use fixed layout.
  69  */
  70 #define PLAIN_PACK_SEGMENTS          (4)
  71
  72 #define PLAIN_PACK_HDR_OFF            (0)
  73 #define PLAIN_PACK_MSG_OFF            (1)
  74 #define PLAIN_PACK_USER_OFF          (2)
  75 #define PLAIN_PACK_BULK_OFF          (3)
  76
  77 #define PLAIN_FL_USER              (0x01)
  78 #define PLAIN_FL_BULK              (0x02)
  79
  80 struct plain_header {
  81         __u8        ph_ver;         /* 0 */
  82         __u8        ph_flags;
  83         __u8        ph_sp;           /* source */
  84         __u8        ph_bulk_hash_alg;  /* complete flavor desc */
  85         __u8        ph_pad[4];
  86 };
  87
  88 struct plain_bulk_token {
  89         __u8        pbt_hash[8];
  90 };
  91
  92 #define PLAIN_BSD_SIZE \
  93         (sizeof(struct ptlrpc_bulk_sec_desc) + sizeof(struct plain_bulk_token))
  94
  95 /****************************************
  96  * bulk checksum helpers                *
  97  ****************************************/
  98
  99 static int plain_unpack_bsd(struct lustre_msg *msg, int swabbed)
 100 {
 101         struct ptlrpc_bulk_sec_desc *bsd;
 102
 103         if (bulk_sec_desc_unpack(msg, PLAIN_PACK_BULK_OFF, swabbed))
 104                 return -EPROTO;
 105
 106         bsd = lustre_msg_buf(msg, PLAIN_PACK_BULK_OFF, PLAIN_BSD_SIZE);
 107         if (!bsd) {
 108                 CERROR("bulk sec desc has short size %d\n",
 109                        lustre_msg_buflen(msg, PLAIN_PACK_BULK_OFF));
 110                 return -EPROTO;
 111         }
 112
 113         if (bsd->bsd_svc != SPTLRPC_BULK_SVC_NULL &&
 114             bsd->bsd_svc != SPTLRPC_BULK_SVC_INTG) {
 115                 CERROR("invalid bulk svc %u\n", bsd->bsd_svc);
 116                 return -EPROTO;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static int plain_generate_bulk_csum(struct ptlrpc_bulk_desc *desc,
 123                                     __u8 hash_alg,
 124                                     struct plain_bulk_token *token)
 125 {
 126         if (hash_alg == BULK_HASH_ALG_NULL)
 127                 return 0;
 128
 129         memset(token->pbt_hash, 0, sizeof(token->pbt_hash));
 130         return sptlrpc_get_bulk_checksum(desc, hash_alg, token->pbt_hash,
 131                                          sizeof(token->pbt_hash));
 132 }
 133
 134 static int plain_verify_bulk_csum(struct ptlrpc_bulk_desc *desc,
 135                                   __u8 hash_alg,
 136                                   struct plain_bulk_token *tokenr)
 137 {
 138         struct plain_bulk_token tokenv;
 139         int rc;
 140
 141         if (hash_alg == BULK_HASH_ALG_NULL)
 142                 return 0;
 143
 144         memset(&tokenv.pbt_hash, 0, sizeof(tokenv.pbt_hash));
 145         rc = sptlrpc_get_bulk_checksum(desc, hash_alg, tokenv.pbt_hash,
 146                                        sizeof(tokenv.pbt_hash));
 147         if (rc)
 148                 return rc;
 149
 150         if (memcmp(tokenr->pbt_hash, tokenv.pbt_hash, sizeof(tokenr->pbt_hash)))
 151                 return -EACCES;
 152         return 0;
 153 }
 154
 155 static void corrupt_bulk_data(struct ptlrpc_bulk_desc *desc)
 156 {
 157         char *ptr;
 158         unsigned int off, i;
 159
 160         for (i = 0; i < desc->bd_iov_count; i++) {
 161                 if (desc->bd_iov[i].kiov_len == 0)
 162                         continue;
 163
 164                 ptr = kmap(desc->bd_iov[i].kiov_page);
 165                 off = desc->bd_iov[i].kiov_offset & ~PAGE_MASK;
 166                 ptr[off] ^= 0x1;
 167                 kunmap(desc->bd_iov[i].kiov_page);
 168                 return;
 169         }
 170 }
 171
 172 /****************************************
 173  * cli_ctx apis                  *
 174  ****************************************/
 175
 176 static
 177 int plain_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
 178 {
 179         /* should never reach here */
 180         LBUG();
 181         return 0;
 182 }
 183
 184 static
 185 int plain_ctx_validate(struct ptlrpc_cli_ctx *ctx)
 186 {
 187         return 0;
 188 }
 189
 190 static
 191 int plain_ctx_sign(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
 192 {
 193         struct lustre_msg *msg = req->rq_reqbuf;
 194         struct plain_header *phdr;
 195
 196         msg->lm_secflvr = req->rq_flvr.sf_rpc;
 197
 198         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, 0);
 199         phdr->ph_ver = 0;
 200         phdr->ph_flags = 0;
 201         phdr->ph_sp = ctx->cc_sec->ps_part;
 202         phdr->ph_bulk_hash_alg = req->rq_flvr.u_bulk.hash.hash_alg;
 203
 204         if (req->rq_pack_udesc)
 205                 phdr->ph_flags |= PLAIN_FL_USER;
 206         if (req->rq_pack_bulk)
 207                 phdr->ph_flags |= PLAIN_FL_BULK;
 208
 209         req->rq_reqdata_len = lustre_msg_size_v2(msg->lm_bufcount,
 210                                                  msg->lm_buflens);
 211         return 0;
 212 }
 213
 214 static
 215 int plain_ctx_verify(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
 216 {
 217         struct lustre_msg *msg = req->rq_repdata;
 218         struct plain_header *phdr;
 219         __u32 cksum;
 220         int swabbed;
 221
 222         if (msg->lm_bufcount != PLAIN_PACK_SEGMENTS) {
 223                 CERROR("unexpected reply buf count %u\n", msg->lm_bufcount);
 224                 return -EPROTO;
 225         }
 226
 227         swabbed = ptlrpc_rep_need_swab(req);
 228
 229         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, sizeof(*phdr));
 230         if (!phdr) {
 231                 CERROR("missing plain header\n");
 232                 return -EPROTO;
 233         }
 234
 235         if (phdr->ph_ver != 0) {
 236                 CERROR("Invalid header version\n");
 237                 return -EPROTO;
 238         }
 239
 240         /* expect no user desc in reply */
 241         if (phdr->ph_flags & PLAIN_FL_USER) {
 242                 CERROR("Unexpected udesc flag in reply\n");
 243                 return -EPROTO;
 244         }
 245
 246         if (phdr->ph_bulk_hash_alg != req->rq_flvr.u_bulk.hash.hash_alg) {
 247                 CERROR("reply bulk flavor %u != %u\n", phdr->ph_bulk_hash_alg,
 248                        req->rq_flvr.u_bulk.hash.hash_alg);
 249                 return -EPROTO;
 250         }
 251
 252         if (unlikely(req->rq_early)) {
 253                 unsigned int hsize = 4;
 254
 255                 cfs_crypto_hash_digest(CFS_HASH_ALG_CRC32,
 256                                 lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0),
 257                                 lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF),
 258                                 NULL, 0, (unsigned char *)&cksum, &hsize);
 259                 if (cksum != msg->lm_cksum) {
 260                         CDEBUG(D_SEC,
 261                                "early reply checksum mismatch: %08x != %08x\n",
 262                                cpu_to_le32(cksum), msg->lm_cksum);
 263                         return -EINVAL;
 264                 }
 265         } else {
 266                 /* whether we sent with bulk or not, we expect the same
 267                  * in reply, except for early reply
 268                  */
 269                 if (!req->rq_early &&
 270                     !equi(req->rq_pack_bulk == 1,
 271                           phdr->ph_flags & PLAIN_FL_BULK)) {
 272                         CERROR("%s bulk checksum in reply\n",
 273                                req->rq_pack_bulk ? "Missing" : "Unexpected");
 274                         return -EPROTO;
 275                 }
 276
 277                 if (phdr->ph_flags & PLAIN_FL_BULK) {
 278                         if (plain_unpack_bsd(msg, swabbed))
 279                                 return -EPROTO;
 280                 }
 281         }
 282
 283         req->rq_repmsg = lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0);
 284         req->rq_replen = lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF);
 285         return 0;
 286 }
 287
 288 static
 289 int plain_cli_wrap_bulk(struct ptlrpc_cli_ctx *ctx,
 290                         struct ptlrpc_request *req,
 291                         struct ptlrpc_bulk_desc *desc)
 292 {
 293         struct ptlrpc_bulk_sec_desc *bsd;
 294         struct plain_bulk_token *token;
 295         int rc;
 296
 297         LASSERT(req->rq_pack_bulk);
 298         LASSERT(req->rq_reqbuf->lm_bufcount == PLAIN_PACK_SEGMENTS);
 299
 300         bsd = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 301         token = (struct plain_bulk_token *) bsd->bsd_data;
 302
 303         bsd->bsd_version = 0;
 304         bsd->bsd_flags = 0;
 305         bsd->bsd_type = SPTLRPC_BULK_DEFAULT;
 306         bsd->bsd_svc = SPTLRPC_FLVR_BULK_SVC(req->rq_flvr.sf_rpc);
 307
 308         if (bsd->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 309                 return 0;
 310
 311         if (req->rq_bulk_read)
 312                 return 0;
 313
 314         rc = plain_generate_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 315                                       token);
 316         if (rc) {
 317                 CERROR("bulk write: failed to compute checksum: %d\n", rc);
 318         } else {
 319                 /*
 320                  * for sending we only compute the wrong checksum instead
 321                  * of corrupting the data so it is still correct on a redo
 322                  */
 323                 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND) &&
 324                     req->rq_flvr.u_bulk.hash.hash_alg != BULK_HASH_ALG_NULL)
 325                         token->pbt_hash[0] ^= 0x1;
 326         }
 327
 328         return rc;
 329 }
 330
 331 static
 332 int plain_cli_unwrap_bulk(struct ptlrpc_cli_ctx *ctx,
 333                           struct ptlrpc_request *req,
 334                           struct ptlrpc_bulk_desc *desc)
 335 {
 336         struct ptlrpc_bulk_sec_desc *bsdv;
 337         struct plain_bulk_token *tokenv;
 338         int rc;
 339         int i, nob;
 340
 341         LASSERT(req->rq_pack_bulk);
 342         LASSERT(req->rq_reqbuf->lm_bufcount == PLAIN_PACK_SEGMENTS);
 343         LASSERT(req->rq_repdata->lm_bufcount == PLAIN_PACK_SEGMENTS);
 344
 345         bsdv = lustre_msg_buf(req->rq_repdata, PLAIN_PACK_BULK_OFF, 0);
 346         tokenv = (struct plain_bulk_token *) bsdv->bsd_data;
 347
 348         if (req->rq_bulk_write) {
 349                 if (bsdv->bsd_flags & BSD_FL_ERR)
 350                         return -EIO;
 351                 return 0;
 352         }
 353
 354         /* fix the actual data size */
 355         for (i = 0, nob = 0; i < desc->bd_iov_count; i++) {
 356                 if (desc->bd_iov[i].kiov_len + nob > desc->bd_nob_transferred) {
 357                         desc->bd_iov[i].kiov_len =
 358                                 desc->bd_nob_transferred - nob;
 359                 }
 360                 nob += desc->bd_iov[i].kiov_len;
 361         }
 362
 363         rc = plain_verify_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 364                                     tokenv);
 365         if (rc)
 366                 CERROR("bulk read: client verify failed: %d\n", rc);
 367
 368         return rc;
 369 }
 370
 371 /****************************************
 372  * sec apis                          *
 373  ****************************************/
 374
 375 static
 376 struct ptlrpc_cli_ctx *plain_sec_install_ctx(struct plain_sec *plsec)
 377 {
 378         struct ptlrpc_cli_ctx *ctx, *ctx_new;
 379
 380         ctx_new = kzalloc(sizeof(*ctx_new), GFP_NOFS);
 381
 382         write_lock(&plsec->pls_lock);
 383
 384         ctx = plsec->pls_ctx;
 385         if (ctx) {
 386                 atomic_inc(&ctx->cc_refcount);
 387
 388                 kfree(ctx_new);
 389         } else if (ctx_new) {
 390                 ctx = ctx_new;
 391
 392                 atomic_set(&ctx->cc_refcount, 1); /* for cache */
 393                 ctx->cc_sec = &plsec->pls_base;
 394                 ctx->cc_ops = &plain_ctx_ops;
 395                 ctx->cc_expire = 0;
 396                 ctx->cc_flags = PTLRPC_CTX_CACHED | PTLRPC_CTX_UPTODATE;
 397                 ctx->cc_vcred.vc_uid = 0;
 398                 spin_lock_init(&ctx->cc_lock);
 399                 INIT_LIST_HEAD(&ctx->cc_req_list);
 400                 INIT_LIST_HEAD(&ctx->cc_gc_chain);
 401
 402                 plsec->pls_ctx = ctx;
 403                 atomic_inc(&plsec->pls_base.ps_nctx);
 404                 atomic_inc(&plsec->pls_base.ps_refcount);
 405
 406                 atomic_inc(&ctx->cc_refcount); /* for caller */
 407         }
 408
 409         write_unlock(&plsec->pls_lock);
 410
 411         return ctx;
 412 }
 413
 414 static
 415 void plain_destroy_sec(struct ptlrpc_sec *sec)
 416 {
 417         struct plain_sec *plsec = sec2plsec(sec);
 418
 419         LASSERT(sec->ps_policy == &plain_policy);
 420         LASSERT(sec->ps_import);
 421         LASSERT(atomic_read(&sec->ps_refcount) == 0);
 422         LASSERT(atomic_read(&sec->ps_nctx) == 0);
 423         LASSERT(!plsec->pls_ctx);
 424
 425         class_import_put(sec->ps_import);
 426
 427         kfree(plsec);
 428 }
 429
 430 static
 431 void plain_kill_sec(struct ptlrpc_sec *sec)
 432 {
 433         sec->ps_dying = 1;
 434 }
 435
 436 static
 437 struct ptlrpc_sec *plain_create_sec(struct obd_import *imp,
 438                                     struct ptlrpc_svc_ctx *svc_ctx,
 439                                     struct sptlrpc_flavor *sf)
 440 {
 441         struct plain_sec *plsec;
 442         struct ptlrpc_sec *sec;
 443         struct ptlrpc_cli_ctx *ctx;
 444
 445         LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_PLAIN);
 446
 447         plsec = kzalloc(sizeof(*plsec), GFP_NOFS);
 448         if (!plsec)
 449                 return NULL;
 450
 451         /*
 452          * initialize plain_sec
 453          */
 454         rwlock_init(&plsec->pls_lock);
 455         plsec->pls_ctx = NULL;
 456
 457         sec = &plsec->pls_base;
 458         sec->ps_policy = &plain_policy;
 459         atomic_set(&sec->ps_refcount, 0);
 460         atomic_set(&sec->ps_nctx, 0);
 461         sec->ps_id = sptlrpc_get_next_secid();
 462         sec->ps_import = class_import_get(imp);
 463         sec->ps_flvr = *sf;
 464         spin_lock_init(&sec->ps_lock);
 465         INIT_LIST_HEAD(&sec->ps_gc_list);
 466         sec->ps_gc_interval = 0;
 467         sec->ps_gc_next = 0;
 468
 469         /* install ctx immediately if this is a reverse sec */
 470         if (svc_ctx) {
 471                 ctx = plain_sec_install_ctx(plsec);
 472                 if (!ctx) {
 473                         plain_destroy_sec(sec);
 474                         return NULL;
 475                 }
 476                 sptlrpc_cli_ctx_put(ctx, 1);
 477         }
 478
 479         return sec;
 480 }
 481
 482 static
 483 struct ptlrpc_cli_ctx *plain_lookup_ctx(struct ptlrpc_sec *sec,
 484                                         struct vfs_cred *vcred,
 485                                         int create, int remove_dead)
 486 {
 487         struct plain_sec *plsec = sec2plsec(sec);
 488         struct ptlrpc_cli_ctx *ctx;
 489
 490         read_lock(&plsec->pls_lock);
 491         ctx = plsec->pls_ctx;
 492         if (ctx)
 493                 atomic_inc(&ctx->cc_refcount);
 494         read_unlock(&plsec->pls_lock);
 495
 496         if (unlikely(!ctx))
 497                 ctx = plain_sec_install_ctx(plsec);
 498
 499         return ctx;
 500 }
 501
 502 static
 503 void plain_release_ctx(struct ptlrpc_sec *sec,
 504                        struct ptlrpc_cli_ctx *ctx, int sync)
 505 {
 506         LASSERT(atomic_read(&sec->ps_refcount) > 0);
 507         LASSERT(atomic_read(&sec->ps_nctx) > 0);
 508         LASSERT(atomic_read(&ctx->cc_refcount) == 0);
 509         LASSERT(ctx->cc_sec == sec);
 510
 511         kfree(ctx);
 512
 513         atomic_dec(&sec->ps_nctx);
 514         sptlrpc_sec_put(sec);
 515 }
 516
 517 static
 518 int plain_flush_ctx_cache(struct ptlrpc_sec *sec,
 519                           uid_t uid, int grace, int force)
 520 {
 521         struct plain_sec *plsec = sec2plsec(sec);
 522         struct ptlrpc_cli_ctx *ctx;
 523
 524         /* do nothing unless caller want to flush for 'all' */
 525         if (uid != -1)
 526                 return 0;
 527
 528         write_lock(&plsec->pls_lock);
 529         ctx = plsec->pls_ctx;
 530         plsec->pls_ctx = NULL;
 531         write_unlock(&plsec->pls_lock);
 532
 533         if (ctx)
 534                 sptlrpc_cli_ctx_put(ctx, 1);
 535         return 0;
 536 }
 537
 538 static
 539 int plain_alloc_reqbuf(struct ptlrpc_sec *sec,
 540                        struct ptlrpc_request *req,
 541                        int msgsize)
 542 {
 543         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 544         int alloc_len;
 545
 546         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 547         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 548
 549         if (req->rq_pack_udesc)
 550                 buflens[PLAIN_PACK_USER_OFF] = sptlrpc_current_user_desc_size();
 551
 552         if (req->rq_pack_bulk) {
 553                 LASSERT(req->rq_bulk_read || req->rq_bulk_write);
 554                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 555         }
 556
 557         alloc_len = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 558
 559         if (!req->rq_reqbuf) {
 560                 LASSERT(!req->rq_pool);
 561
 562                 alloc_len = size_roundup_power2(alloc_len);
 563                 req->rq_reqbuf = libcfs_kvzalloc(alloc_len, GFP_NOFS);
 564                 if (!req->rq_reqbuf)
 565                         return -ENOMEM;
 566
 567                 req->rq_reqbuf_len = alloc_len;
 568         } else {
 569                 LASSERT(req->rq_pool);
 570                 LASSERT(req->rq_reqbuf_len >= alloc_len);
 571                 memset(req->rq_reqbuf, 0, alloc_len);
 572         }
 573
 574         lustre_init_msg_v2(req->rq_reqbuf, PLAIN_PACK_SEGMENTS, buflens, NULL);
 575         req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0);
 576
 577         if (req->rq_pack_udesc)
 578                 sptlrpc_pack_user_desc(req->rq_reqbuf, PLAIN_PACK_USER_OFF);
 579
 580         return 0;
 581 }
 582
 583 static
 584 void plain_free_reqbuf(struct ptlrpc_sec *sec,
 585                        struct ptlrpc_request *req)
 586 {
 587         if (!req->rq_pool) {
 588                 kvfree(req->rq_reqbuf);
 589                 req->rq_reqbuf = NULL;
 590                 req->rq_reqbuf_len = 0;
 591         }
 592 }
 593
 594 static
 595 int plain_alloc_repbuf(struct ptlrpc_sec *sec,
 596                        struct ptlrpc_request *req,
 597                        int msgsize)
 598 {
 599         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 600         int alloc_len;
 601
 602         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 603         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 604
 605         if (req->rq_pack_bulk) {
 606                 LASSERT(req->rq_bulk_read || req->rq_bulk_write);
 607                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 608         }
 609
 610         alloc_len = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 611
 612         /* add space for early reply */
 613         alloc_len += plain_at_offset;
 614
 615         alloc_len = size_roundup_power2(alloc_len);
 616
 617         req->rq_repbuf = libcfs_kvzalloc(alloc_len, GFP_NOFS);
 618         if (!req->rq_repbuf)
 619                 return -ENOMEM;
 620
 621         req->rq_repbuf_len = alloc_len;
 622         return 0;
 623 }
 624
 625 static
 626 void plain_free_repbuf(struct ptlrpc_sec *sec,
 627                        struct ptlrpc_request *req)
 628 {
 629         kvfree(req->rq_repbuf);
 630         req->rq_repbuf = NULL;
 631         req->rq_repbuf_len = 0;
 632 }
 633
 634 static
 635 int plain_enlarge_reqbuf(struct ptlrpc_sec *sec,
 636                          struct ptlrpc_request *req,
 637                          int segment, int newsize)
 638 {
 639         struct lustre_msg *newbuf;
 640         int oldsize;
 641         int newmsg_size, newbuf_size;
 642
 643         LASSERT(req->rq_reqbuf);
 644         LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
 645         LASSERT(lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0) ==
 646                 req->rq_reqmsg);
 647
 648         /* compute new embedded msg size.  */
 649         oldsize = req->rq_reqmsg->lm_buflens[segment];
 650         req->rq_reqmsg->lm_buflens[segment] = newsize;
 651         newmsg_size = lustre_msg_size_v2(req->rq_reqmsg->lm_bufcount,
 652                                          req->rq_reqmsg->lm_buflens);
 653         req->rq_reqmsg->lm_buflens[segment] = oldsize;
 654
 655         /* compute new wrapper msg size.  */
 656         oldsize = req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF];
 657         req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF] = newmsg_size;
 658         newbuf_size = lustre_msg_size_v2(req->rq_reqbuf->lm_bufcount,
 659                                          req->rq_reqbuf->lm_buflens);
 660         req->rq_reqbuf->lm_buflens[PLAIN_PACK_MSG_OFF] = oldsize;
 661
 662         /* request from pool should always have enough buffer */
 663         LASSERT(!req->rq_pool || req->rq_reqbuf_len >= newbuf_size);
 664
 665         if (req->rq_reqbuf_len < newbuf_size) {
 666                 newbuf_size = size_roundup_power2(newbuf_size);
 667
 668                 newbuf = libcfs_kvzalloc(newbuf_size, GFP_NOFS);
 669                 if (!newbuf)
 670                         return -ENOMEM;
 671
 672                 /* Must lock this, so that otherwise unprotected change of
 673                  * rq_reqmsg is not racing with parallel processing of
 674                  * imp_replay_list traversing threads. See LU-3333
 675                  * This is a bandaid at best, we really need to deal with this
 676                  * in request enlarging code before unpacking that's already
 677                  * there
 678                  */
 679                 if (req->rq_import)
 680                         spin_lock(&req->rq_import->imp_lock);
 681
 682                 memcpy(newbuf, req->rq_reqbuf, req->rq_reqbuf_len);
 683
 684                 kvfree(req->rq_reqbuf);
 685                 req->rq_reqbuf = newbuf;
 686                 req->rq_reqbuf_len = newbuf_size;
 687                 req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf,
 688                                                 PLAIN_PACK_MSG_OFF, 0);
 689
 690                 if (req->rq_import)
 691                         spin_unlock(&req->rq_import->imp_lock);
 692         }
 693
 694         _sptlrpc_enlarge_msg_inplace(req->rq_reqbuf, PLAIN_PACK_MSG_OFF,
 695                                      newmsg_size);
 696         _sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
 697
 698         req->rq_reqlen = newmsg_size;
 699         return 0;
 700 }
 701
 702 /****************************************
 703  * service apis                  *
 704  ****************************************/
 705
 706 static struct ptlrpc_svc_ctx plain_svc_ctx = {
 707         .sc_refcount    = ATOMIC_INIT(1),
 708         .sc_policy      = &plain_policy,
 709 };
 710
 711 static
 712 int plain_accept(struct ptlrpc_request *req)
 713 {
 714         struct lustre_msg *msg = req->rq_reqbuf;
 715         struct plain_header *phdr;
 716         int swabbed;
 717
 718         LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
 719                 SPTLRPC_POLICY_PLAIN);
 720
 721         if (SPTLRPC_FLVR_BASE(req->rq_flvr.sf_rpc) !=
 722             SPTLRPC_FLVR_BASE(SPTLRPC_FLVR_PLAIN) ||
 723             SPTLRPC_FLVR_BULK_TYPE(req->rq_flvr.sf_rpc) !=
 724             SPTLRPC_FLVR_BULK_TYPE(SPTLRPC_FLVR_PLAIN)) {
 725                 CERROR("Invalid rpc flavor %x\n", req->rq_flvr.sf_rpc);
 726                 return SECSVC_DROP;
 727         }
 728
 729         if (msg->lm_bufcount < PLAIN_PACK_SEGMENTS) {
 730                 CERROR("unexpected request buf count %u\n", msg->lm_bufcount);
 731                 return SECSVC_DROP;
 732         }
 733
 734         swabbed = ptlrpc_req_need_swab(req);
 735
 736         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, sizeof(*phdr));
 737         if (!phdr) {
 738                 CERROR("missing plain header\n");
 739                 return -EPROTO;
 740         }
 741
 742         if (phdr->ph_ver != 0) {
 743                 CERROR("Invalid header version\n");
 744                 return -EPROTO;
 745         }
 746
 747         if (phdr->ph_bulk_hash_alg >= BULK_HASH_ALG_MAX) {
 748                 CERROR("invalid hash algorithm: %u\n", phdr->ph_bulk_hash_alg);
 749                 return -EPROTO;
 750         }
 751
 752         req->rq_sp_from = phdr->ph_sp;
 753         req->rq_flvr.u_bulk.hash.hash_alg = phdr->ph_bulk_hash_alg;
 754
 755         if (phdr->ph_flags & PLAIN_FL_USER) {
 756                 if (sptlrpc_unpack_user_desc(msg, PLAIN_PACK_USER_OFF,
 757                                              swabbed)) {
 758                         CERROR("Mal-formed user descriptor\n");
 759                         return SECSVC_DROP;
 760                 }
 761
 762                 req->rq_pack_udesc = 1;
 763                 req->rq_user_desc = lustre_msg_buf(msg, PLAIN_PACK_USER_OFF, 0);
 764         }
 765
 766         if (phdr->ph_flags & PLAIN_FL_BULK) {
 767                 if (plain_unpack_bsd(msg, swabbed))
 768                         return SECSVC_DROP;
 769
 770                 req->rq_pack_bulk = 1;
 771         }
 772
 773         req->rq_reqmsg = lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0);
 774         req->rq_reqlen = msg->lm_buflens[PLAIN_PACK_MSG_OFF];
 775
 776         req->rq_svc_ctx = &plain_svc_ctx;
 777         atomic_inc(&req->rq_svc_ctx->sc_refcount);
 778
 779         return SECSVC_OK;
 780 }
 781
 782 static
 783 int plain_alloc_rs(struct ptlrpc_request *req, int msgsize)
 784 {
 785         struct ptlrpc_reply_state *rs;
 786         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 787         int rs_size = sizeof(*rs);
 788
 789         LASSERT(msgsize % 8 == 0);
 790
 791         buflens[PLAIN_PACK_HDR_OFF] = sizeof(struct plain_header);
 792         buflens[PLAIN_PACK_MSG_OFF] = msgsize;
 793
 794         if (req->rq_pack_bulk && (req->rq_bulk_read || req->rq_bulk_write))
 795                 buflens[PLAIN_PACK_BULK_OFF] = PLAIN_BSD_SIZE;
 796
 797         rs_size += lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 798
 799         rs = req->rq_reply_state;
 800
 801         if (rs) {
 802                 /* pre-allocated */
 803                 LASSERT(rs->rs_size >= rs_size);
 804         } else {
 805                 rs = libcfs_kvzalloc(rs_size, GFP_NOFS);
 806                 if (!rs)
 807                         return -ENOMEM;
 808
 809                 rs->rs_size = rs_size;
 810         }
 811
 812         rs->rs_svc_ctx = req->rq_svc_ctx;
 813         atomic_inc(&req->rq_svc_ctx->sc_refcount);
 814         rs->rs_repbuf = (struct lustre_msg *) (rs + 1);
 815         rs->rs_repbuf_len = rs_size - sizeof(*rs);
 816
 817         lustre_init_msg_v2(rs->rs_repbuf, PLAIN_PACK_SEGMENTS, buflens, NULL);
 818         rs->rs_msg = lustre_msg_buf_v2(rs->rs_repbuf, PLAIN_PACK_MSG_OFF, 0);
 819
 820         req->rq_reply_state = rs;
 821         return 0;
 822 }
 823
 824 static
 825 void plain_free_rs(struct ptlrpc_reply_state *rs)
 826 {
 827         LASSERT(atomic_read(&rs->rs_svc_ctx->sc_refcount) > 1);
 828         atomic_dec(&rs->rs_svc_ctx->sc_refcount);
 829
 830         if (!rs->rs_prealloc)
 831                 kvfree(rs);
 832 }
 833
 834 static
 835 int plain_authorize(struct ptlrpc_request *req)
 836 {
 837         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 838         struct lustre_msg_v2 *msg = rs->rs_repbuf;
 839         struct plain_header *phdr;
 840         int len;
 841
 842         LASSERT(rs);
 843         LASSERT(msg);
 844
 845         if (req->rq_replen != msg->lm_buflens[PLAIN_PACK_MSG_OFF])
 846                 len = lustre_shrink_msg(msg, PLAIN_PACK_MSG_OFF,
 847                                         req->rq_replen, 1);
 848         else
 849                 len = lustre_msg_size_v2(msg->lm_bufcount, msg->lm_buflens);
 850
 851         msg->lm_secflvr = req->rq_flvr.sf_rpc;
 852
 853         phdr = lustre_msg_buf(msg, PLAIN_PACK_HDR_OFF, 0);
 854         phdr->ph_ver = 0;
 855         phdr->ph_flags = 0;
 856         phdr->ph_bulk_hash_alg = req->rq_flvr.u_bulk.hash.hash_alg;
 857
 858         if (req->rq_pack_bulk)
 859                 phdr->ph_flags |= PLAIN_FL_BULK;
 860
 861         rs->rs_repdata_len = len;
 862
 863         if (likely(req->rq_packed_final)) {
 864                 if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
 865                         req->rq_reply_off = plain_at_offset;
 866                 else
 867                         req->rq_reply_off = 0;
 868         } else {
 869                 unsigned int hsize = 4;
 870
 871                 cfs_crypto_hash_digest(CFS_HASH_ALG_CRC32,
 872                         lustre_msg_buf(msg, PLAIN_PACK_MSG_OFF, 0),
 873                         lustre_msg_buflen(msg, PLAIN_PACK_MSG_OFF),
 874                         NULL, 0, (unsigned char *)&msg->lm_cksum, &hsize);
 875                 req->rq_reply_off = 0;
 876         }
 877
 878         return 0;
 879 }
 880
 881 static
 882 int plain_svc_unwrap_bulk(struct ptlrpc_request *req,
 883                           struct ptlrpc_bulk_desc *desc)
 884 {
 885         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 886         struct ptlrpc_bulk_sec_desc *bsdr, *bsdv;
 887         struct plain_bulk_token *tokenr;
 888         int rc;
 889
 890         LASSERT(req->rq_bulk_write);
 891         LASSERT(req->rq_pack_bulk);
 892
 893         bsdr = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 894         tokenr = (struct plain_bulk_token *) bsdr->bsd_data;
 895         bsdv = lustre_msg_buf(rs->rs_repbuf, PLAIN_PACK_BULK_OFF, 0);
 896
 897         bsdv->bsd_version = 0;
 898         bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
 899         bsdv->bsd_svc = bsdr->bsd_svc;
 900         bsdv->bsd_flags = 0;
 901
 902         if (bsdr->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 903                 return 0;
 904
 905         rc = plain_verify_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 906                                     tokenr);
 907         if (rc) {
 908                 bsdv->bsd_flags |= BSD_FL_ERR;
 909                 CERROR("bulk write: server verify failed: %d\n", rc);
 910         }
 911
 912         return rc;
 913 }
 914
 915 static
 916 int plain_svc_wrap_bulk(struct ptlrpc_request *req,
 917                         struct ptlrpc_bulk_desc *desc)
 918 {
 919         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 920         struct ptlrpc_bulk_sec_desc *bsdr, *bsdv;
 921         struct plain_bulk_token *tokenv;
 922         int rc;
 923
 924         LASSERT(req->rq_bulk_read);
 925         LASSERT(req->rq_pack_bulk);
 926
 927         bsdr = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_BULK_OFF, 0);
 928         bsdv = lustre_msg_buf(rs->rs_repbuf, PLAIN_PACK_BULK_OFF, 0);
 929         tokenv = (struct plain_bulk_token *) bsdv->bsd_data;
 930
 931         bsdv->bsd_version = 0;
 932         bsdv->bsd_type = SPTLRPC_BULK_DEFAULT;
 933         bsdv->bsd_svc = bsdr->bsd_svc;
 934         bsdv->bsd_flags = 0;
 935
 936         if (bsdr->bsd_svc == SPTLRPC_BULK_SVC_NULL)
 937                 return 0;
 938
 939         rc = plain_generate_bulk_csum(desc, req->rq_flvr.u_bulk.hash.hash_alg,
 940                                       tokenv);
 941         if (rc) {
 942                 CERROR("bulk read: server failed to compute checksum: %d\n",
 943                        rc);
 944         } else {
 945                 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))
 946                         corrupt_bulk_data(desc);
 947         }
 948
 949         return rc;
 950 }
 951
 952 static struct ptlrpc_ctx_ops plain_ctx_ops = {
 953         .refresh                = plain_ctx_refresh,
 954         .validate              = plain_ctx_validate,
 955         .sign              = plain_ctx_sign,
 956         .verify          = plain_ctx_verify,
 957         .wrap_bulk            = plain_cli_wrap_bulk,
 958         .unwrap_bulk        = plain_cli_unwrap_bulk,
 959 };
 960
 961 static struct ptlrpc_sec_cops plain_sec_cops = {
 962         .create_sec          = plain_create_sec,
 963         .destroy_sec        = plain_destroy_sec,
 964         .kill_sec              = plain_kill_sec,
 965         .lookup_ctx          = plain_lookup_ctx,
 966         .release_ctx        = plain_release_ctx,
 967         .flush_ctx_cache        = plain_flush_ctx_cache,
 968         .alloc_reqbuf      = plain_alloc_reqbuf,
 969         .free_reqbuf        = plain_free_reqbuf,
 970         .alloc_repbuf      = plain_alloc_repbuf,
 971         .free_repbuf        = plain_free_repbuf,
 972         .enlarge_reqbuf  = plain_enlarge_reqbuf,
 973 };
 974
 975 static struct ptlrpc_sec_sops plain_sec_sops = {
 976         .accept          = plain_accept,
 977         .alloc_rs              = plain_alloc_rs,
 978         .authorize            = plain_authorize,
 979         .free_rs                = plain_free_rs,
 980         .unwrap_bulk        = plain_svc_unwrap_bulk,
 981         .wrap_bulk            = plain_svc_wrap_bulk,
 982 };
 983
 984 static struct ptlrpc_sec_policy plain_policy = {
 985         .sp_owner              = THIS_MODULE,
 986         .sp_name                = "plain",
 987         .sp_policy            = SPTLRPC_POLICY_PLAIN,
 988         .sp_cops                = &plain_sec_cops,
 989         .sp_sops                = &plain_sec_sops,
 990 };
 991
 992 int sptlrpc_plain_init(void)
 993 {
 994         __u32 buflens[PLAIN_PACK_SEGMENTS] = { 0, };
 995         int rc;
 996
 997         buflens[PLAIN_PACK_MSG_OFF] = lustre_msg_early_size();
 998         plain_at_offset = lustre_msg_size_v2(PLAIN_PACK_SEGMENTS, buflens);
 999
1000         rc = sptlrpc_register_policy(&plain_policy);
1001         if (rc)
1002                 CERROR("failed to register: %d\n", rc);
1003
1004         return rc;
1005 }
1006
1007 void sptlrpc_plain_fini(void)
1008 {
1009         int rc;
1010
1011         rc = sptlrpc_unregister_policy(&plain_policy);
1012         if (rc)
1013                 CERROR("cannot unregister: %d\n", rc);
1014 }