lustre/ptlrpc/sec_null.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, 2012, 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_null.c
  37  *
  38  * Author: Eric Mei <ericm@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_SEC
  42
  43 #ifndef __KERNEL__
  44 #include <liblustre.h>
  45 #endif
  46
  47 #include <obd_support.h>
  48 #include <obd_cksum.h>
  49 #include <obd_class.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52
  53 static struct ptlrpc_sec_policy null_policy;
  54 static struct ptlrpc_sec        null_sec;
  55 static struct ptlrpc_cli_ctx    null_cli_ctx;
  56 static struct ptlrpc_svc_ctx    null_svc_ctx;
  57
  58 /*
  59  * we can temporarily use the topmost 8-bits of lm_secflvr to identify
  60  * the source sec part.
  61  */
  62 static inline
  63 void null_encode_sec_part(struct lustre_msg *msg, enum lustre_sec_part sp)
  64 {
  65         msg->lm_secflvr |= (((__u32) sp) & 0xFF) << 24;
  66 }
  67
  68 static inline
  69 enum lustre_sec_part null_decode_sec_part(struct lustre_msg *msg)
  70 {
  71         return (msg->lm_secflvr >> 24) & 0xFF;
  72 }
  73
  74 static int null_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
  75 {
  76         /* should never reach here */
  77         LBUG();
  78         return 0;
  79 }
  80
  81 static
  82 int null_ctx_sign(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
  83 {
  84         req->rq_reqbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
  85
  86         if (!req->rq_import->imp_dlm_fake) {
  87                 struct obd_device *obd = req->rq_import->imp_obd;
  88                 null_encode_sec_part(req->rq_reqbuf,
  89                                      obd->u.cli.cl_sp_me);
  90         }
  91         req->rq_reqdata_len = req->rq_reqlen;
  92         return 0;
  93 }
  94
  95 static
  96 int null_ctx_verify(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
  97 {
  98         __u32   cksums, cksumc;
  99
 100         LASSERT(req->rq_repdata);
 101
 102         req->rq_repmsg = req->rq_repdata;
 103         req->rq_replen = req->rq_repdata_len;
 104
 105         if (req->rq_early) {
 106                 cksums = lustre_msg_get_cksum(req->rq_repdata);
 107 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 7, 50, 0)
 108                 if (lustre_msghdr_get_flags(req->rq_reqmsg) &
 109                     MSGHDR_CKSUM_INCOMPAT18)
 110                         cksumc = lustre_msg_calc_cksum(req->rq_repmsg, 0);
 111                 else
 112                         cksumc = lustre_msg_calc_cksum(req->rq_repmsg, 1);
 113 #else
 114 # warning "remove checksum compatibility support for b1_8"
 115                 cksumc = lustre_msg_calc_cksum(req->rq_repmsg);
 116 #endif
 117                 if (cksumc != cksums) {
 118                         CDEBUG(D_SEC,
 119                                "early reply checksum mismatch: %08x != %08x\n",
 120                                cksumc, cksums);
 121                         return -EINVAL;
 122                 }
 123         }
 124
 125         return 0;
 126 }
 127
 128 static
 129 struct ptlrpc_sec *null_create_sec(struct obd_import *imp,
 130                                    struct ptlrpc_svc_ctx *svc_ctx,
 131                                    struct sptlrpc_flavor *sf)
 132 {
 133         LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_NULL);
 134
 135         /* general layer has take a module reference for us, because we never
 136          * really destroy the sec, simply release the reference here.
 137          */
 138         sptlrpc_policy_put(&null_policy);
 139         return &null_sec;
 140 }
 141
 142 static
 143 void null_destroy_sec(struct ptlrpc_sec *sec)
 144 {
 145         LASSERT(sec == &null_sec);
 146 }
 147
 148 static
 149 struct ptlrpc_cli_ctx *null_lookup_ctx(struct ptlrpc_sec *sec,
 150                                        struct vfs_cred *vcred,
 151                                        int create, int remove_dead)
 152 {
 153         atomic_inc(&null_cli_ctx.cc_refcount);
 154         return &null_cli_ctx;
 155 }
 156
 157 static
 158 int null_flush_ctx_cache(struct ptlrpc_sec *sec,
 159                          uid_t uid,
 160                          int grace, int force)
 161 {
 162         return 0;
 163 }
 164
 165 static
 166 int null_alloc_reqbuf(struct ptlrpc_sec *sec,
 167                       struct ptlrpc_request *req,
 168                       int msgsize)
 169 {
 170         if (!req->rq_reqbuf) {
 171                 int alloc_size = size_roundup_power2(msgsize);
 172
 173                 LASSERT(!req->rq_pool);
 174                 OBD_ALLOC_LARGE(req->rq_reqbuf, alloc_size);
 175                 if (!req->rq_reqbuf)
 176                         return -ENOMEM;
 177
 178                 req->rq_reqbuf_len = alloc_size;
 179         } else {
 180                 LASSERT(req->rq_pool);
 181                 LASSERT(req->rq_reqbuf_len >= msgsize);
 182                 memset(req->rq_reqbuf, 0, msgsize);
 183         }
 184
 185         req->rq_reqmsg = req->rq_reqbuf;
 186         return 0;
 187 }
 188
 189 static
 190 void null_free_reqbuf(struct ptlrpc_sec *sec,
 191                       struct ptlrpc_request *req)
 192 {
 193         if (!req->rq_pool) {
 194                 LASSERTF(req->rq_reqmsg == req->rq_reqbuf,
 195                          "req %p: reqmsg %p is not reqbuf %p in null sec\n",
 196                          req, req->rq_reqmsg, req->rq_reqbuf);
 197                 LASSERTF(req->rq_reqbuf_len >= req->rq_reqlen,
 198                          "req %p: reqlen %d should smaller than buflen %d\n",
 199                          req, req->rq_reqlen, req->rq_reqbuf_len);
 200
 201                 OBD_FREE_LARGE(req->rq_reqbuf, req->rq_reqbuf_len);
 202                 req->rq_reqbuf = NULL;
 203                 req->rq_reqbuf_len = 0;
 204         }
 205 }
 206
 207 static
 208 int null_alloc_repbuf(struct ptlrpc_sec *sec,
 209                       struct ptlrpc_request *req,
 210                       int msgsize)
 211 {
 212         /* add space for early replied */
 213         msgsize += lustre_msg_early_size();
 214
 215         msgsize = size_roundup_power2(msgsize);
 216
 217         OBD_ALLOC_LARGE(req->rq_repbuf, msgsize);
 218         if (!req->rq_repbuf)
 219                 return -ENOMEM;
 220
 221         req->rq_repbuf_len = msgsize;
 222         return 0;
 223 }
 224
 225 static
 226 void null_free_repbuf(struct ptlrpc_sec *sec,
 227                       struct ptlrpc_request *req)
 228 {
 229         LASSERT(req->rq_repbuf);
 230
 231         OBD_FREE_LARGE(req->rq_repbuf, req->rq_repbuf_len);
 232         req->rq_repbuf = NULL;
 233         req->rq_repbuf_len = 0;
 234 }
 235
 236 static
 237 int null_enlarge_reqbuf(struct ptlrpc_sec *sec,
 238                         struct ptlrpc_request *req,
 239                         int segment, int newsize)
 240 {
 241         struct lustre_msg      *newbuf;
 242         struct lustre_msg      *oldbuf = req->rq_reqmsg;
 243         int                     oldsize, newmsg_size, alloc_size;
 244
 245         LASSERT(req->rq_reqbuf);
 246         LASSERT(req->rq_reqbuf == req->rq_reqmsg);
 247         LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
 248         LASSERT(req->rq_reqlen == lustre_packed_msg_size(oldbuf));
 249
 250         /* compute new message size */
 251         oldsize = req->rq_reqbuf->lm_buflens[segment];
 252         req->rq_reqbuf->lm_buflens[segment] = newsize;
 253         newmsg_size = lustre_packed_msg_size(oldbuf);
 254         req->rq_reqbuf->lm_buflens[segment] = oldsize;
 255
 256         /* request from pool should always have enough buffer */
 257         LASSERT(!req->rq_pool || req->rq_reqbuf_len >= newmsg_size);
 258
 259         if (req->rq_reqbuf_len < newmsg_size) {
 260                 alloc_size = size_roundup_power2(newmsg_size);
 261
 262                 OBD_ALLOC_LARGE(newbuf, alloc_size);
 263                 if (newbuf == NULL)
 264                         return -ENOMEM;
 265
 266                 /* Must lock this, so that otherwise unprotected change of
 267                  * rq_reqmsg is not racing with parallel processing of
 268                  * imp_replay_list traversing threads. See LU-3333
 269                  * This is a bandaid at best, we really need to deal with this
 270                  * in request enlarging code before unpacking that's already
 271                  * there */
 272                 if (req->rq_import)
 273                         spin_lock(&req->rq_import->imp_lock);
 274                 memcpy(newbuf, req->rq_reqbuf, req->rq_reqlen);
 275
 276                 OBD_FREE_LARGE(req->rq_reqbuf, req->rq_reqbuf_len);
 277                 req->rq_reqbuf = req->rq_reqmsg = newbuf;
 278                 req->rq_reqbuf_len = alloc_size;
 279
 280                 if (req->rq_import)
 281                         spin_unlock(&req->rq_import->imp_lock);
 282         }
 283
 284         _sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
 285         req->rq_reqlen = newmsg_size;
 286
 287         return 0;
 288 }
 289
 290 static struct ptlrpc_svc_ctx null_svc_ctx = {
 291         .sc_refcount    = ATOMIC_INIT(1),
 292         .sc_policy      = &null_policy,
 293 };
 294
 295 static
 296 int null_accept(struct ptlrpc_request *req)
 297 {
 298         LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
 299                 SPTLRPC_POLICY_NULL);
 300
 301         if (req->rq_flvr.sf_rpc != SPTLRPC_FLVR_NULL) {
 302                 CERROR("Invalid rpc flavor 0x%x\n", req->rq_flvr.sf_rpc);
 303                 return SECSVC_DROP;
 304         }
 305
 306         req->rq_sp_from = null_decode_sec_part(req->rq_reqbuf);
 307
 308         req->rq_reqmsg = req->rq_reqbuf;
 309         req->rq_reqlen = req->rq_reqdata_len;
 310
 311         req->rq_svc_ctx = &null_svc_ctx;
 312         atomic_inc(&req->rq_svc_ctx->sc_refcount);
 313
 314         return SECSVC_OK;
 315 }
 316
 317 static
 318 int null_alloc_rs(struct ptlrpc_request *req, int msgsize)
 319 {
 320         struct ptlrpc_reply_state *rs;
 321         int rs_size = sizeof(*rs) + msgsize;
 322
 323         LASSERT(msgsize % 8 == 0);
 324
 325         rs = req->rq_reply_state;
 326
 327         if (rs) {
 328                 /* pre-allocated */
 329                 LASSERT(rs->rs_size >= rs_size);
 330         } else {
 331                 OBD_ALLOC_LARGE(rs, rs_size);
 332                 if (rs == NULL)
 333                         return -ENOMEM;
 334
 335                 rs->rs_size = rs_size;
 336         }
 337
 338         rs->rs_svc_ctx = req->rq_svc_ctx;
 339         atomic_inc(&req->rq_svc_ctx->sc_refcount);
 340
 341         rs->rs_repbuf = (struct lustre_msg *) (rs + 1);
 342         rs->rs_repbuf_len = rs_size - sizeof(*rs);
 343         rs->rs_msg = rs->rs_repbuf;
 344
 345         req->rq_reply_state = rs;
 346         return 0;
 347 }
 348
 349 static
 350 void null_free_rs(struct ptlrpc_reply_state *rs)
 351 {
 352         LASSERT_ATOMIC_GT(&rs->rs_svc_ctx->sc_refcount, 1);
 353         atomic_dec(&rs->rs_svc_ctx->sc_refcount);
 354
 355         if (!rs->rs_prealloc)
 356                 OBD_FREE_LARGE(rs, rs->rs_size);
 357 }
 358
 359 static
 360 int null_authorize(struct ptlrpc_request *req)
 361 {
 362         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 363
 364         LASSERT(rs);
 365
 366         rs->rs_repbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
 367         rs->rs_repdata_len = req->rq_replen;
 368
 369         if (likely(req->rq_packed_final)) {
 370                 if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
 371                         req->rq_reply_off = lustre_msg_early_size();
 372                 else
 373                         req->rq_reply_off = 0;
 374         } else {
 375                 __u32 cksum;
 376
 377 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 7, 50, 0)
 378                 if (lustre_msghdr_get_flags(req->rq_reqmsg) &
 379                     MSGHDR_CKSUM_INCOMPAT18)
 380                         cksum = lustre_msg_calc_cksum(rs->rs_repbuf, 0);
 381                 else
 382                         cksum = lustre_msg_calc_cksum(rs->rs_repbuf, 1);
 383 #else
 384 # warning "remove checksum compatibility support for b1_8"
 385                 cksum = lustre_msg_calc_cksum(rs->rs_repbuf);
 386 #endif
 387                 lustre_msg_set_cksum(rs->rs_repbuf, cksum);
 388                 req->rq_reply_off = 0;
 389         }
 390
 391         return 0;
 392 }
 393
 394 static struct ptlrpc_ctx_ops null_ctx_ops = {
 395         .refresh                = null_ctx_refresh,
 396         .sign                   = null_ctx_sign,
 397         .verify                 = null_ctx_verify,
 398 };
 399
 400 static struct ptlrpc_sec_cops null_sec_cops = {
 401         .create_sec             = null_create_sec,
 402         .destroy_sec            = null_destroy_sec,
 403         .lookup_ctx             = null_lookup_ctx,
 404         .flush_ctx_cache        = null_flush_ctx_cache,
 405         .alloc_reqbuf           = null_alloc_reqbuf,
 406         .alloc_repbuf           = null_alloc_repbuf,
 407         .free_reqbuf            = null_free_reqbuf,
 408         .free_repbuf            = null_free_repbuf,
 409         .enlarge_reqbuf         = null_enlarge_reqbuf,
 410 };
 411
 412 static struct ptlrpc_sec_sops null_sec_sops = {
 413         .accept                 = null_accept,
 414         .alloc_rs               = null_alloc_rs,
 415         .authorize              = null_authorize,
 416         .free_rs                = null_free_rs,
 417 };
 418
 419 static struct ptlrpc_sec_policy null_policy = {
 420         .sp_owner               = THIS_MODULE,
 421         .sp_name                = "sec.null",
 422         .sp_policy              = SPTLRPC_POLICY_NULL,
 423         .sp_cops                = &null_sec_cops,
 424         .sp_sops                = &null_sec_sops,
 425 };
 426
 427 static void null_init_internal(void)
 428 {
 429         static CFS_HLIST_HEAD(__list);
 430
 431         null_sec.ps_policy = &null_policy;
 432         atomic_set(&null_sec.ps_refcount, 1);   /* always busy */
 433         null_sec.ps_id = -1;
 434         null_sec.ps_import = NULL;
 435         null_sec.ps_flvr.sf_rpc = SPTLRPC_FLVR_NULL;
 436         null_sec.ps_flvr.sf_flags = 0;
 437         null_sec.ps_part = LUSTRE_SP_ANY;
 438         null_sec.ps_dying = 0;
 439         spin_lock_init(&null_sec.ps_lock);
 440         atomic_set(&null_sec.ps_nctx, 1);       /* for "null_cli_ctx" */
 441         CFS_INIT_LIST_HEAD(&null_sec.ps_gc_list);
 442         null_sec.ps_gc_interval = 0;
 443         null_sec.ps_gc_next = 0;
 444
 445         cfs_hlist_add_head(&null_cli_ctx.cc_cache, &__list);
 446         atomic_set(&null_cli_ctx.cc_refcount, 1);       /* for hash */
 447         null_cli_ctx.cc_sec = &null_sec;
 448         null_cli_ctx.cc_ops = &null_ctx_ops;
 449         null_cli_ctx.cc_expire = 0;
 450         null_cli_ctx.cc_flags = PTLRPC_CTX_CACHED | PTLRPC_CTX_ETERNAL |
 451                                 PTLRPC_CTX_UPTODATE;
 452         null_cli_ctx.cc_vcred.vc_uid = 0;
 453         spin_lock_init(&null_cli_ctx.cc_lock);
 454         CFS_INIT_LIST_HEAD(&null_cli_ctx.cc_req_list);
 455         CFS_INIT_LIST_HEAD(&null_cli_ctx.cc_gc_chain);
 456 }
 457
 458 int sptlrpc_null_init(void)
 459 {
 460         int rc;
 461
 462         null_init_internal();
 463
 464         rc = sptlrpc_register_policy(&null_policy);
 465         if (rc)
 466                 CERROR("failed to register %s: %d\n", null_policy.sp_name, rc);
 467
 468         return rc;
 469 }
 470
 471 void sptlrpc_null_fini(void)
 472 {
 473         int rc;
 474
 475         rc = sptlrpc_unregister_policy(&null_policy);
 476         if (rc)
 477                 CERROR("failed to unregister %s: %d\n", null_policy.sp_name,rc);
 478 }