drivers/staging/lustre/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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2012, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/ptlrpc/sec_null.c
  33  *
  34  * Author: Eric Mei <ericm@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_SEC
  38
  39 #include "../include/obd_support.h"
  40 #include "../include/obd_cksum.h"
  41 #include "../include/obd_class.h"
  42 #include "../include/lustre_net.h"
  43 #include "../include/lustre_sec.h"
  44
  45 #include "ptlrpc_internal.h"
  46
  47 static struct ptlrpc_sec_policy null_policy;
  48 static struct ptlrpc_sec        null_sec;
  49 static struct ptlrpc_cli_ctx    null_cli_ctx;
  50 static struct ptlrpc_svc_ctx    null_svc_ctx;
  51
  52 /*
  53  * we can temporarily use the topmost 8-bits of lm_secflvr to identify
  54  * the source sec part.
  55  */
  56 static inline
  57 void null_encode_sec_part(struct lustre_msg *msg, enum lustre_sec_part sp)
  58 {
  59         msg->lm_secflvr |= (((__u32)sp) & 0xFF) << 24;
  60 }
  61
  62 static inline
  63 enum lustre_sec_part null_decode_sec_part(struct lustre_msg *msg)
  64 {
  65         return (msg->lm_secflvr >> 24) & 0xFF;
  66 }
  67
  68 static int null_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
  69 {
  70         /* should never reach here */
  71         LBUG();
  72         return 0;
  73 }
  74
  75 static
  76 int null_ctx_sign(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
  77 {
  78         req->rq_reqbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
  79
  80         if (!req->rq_import->imp_dlm_fake) {
  81                 struct obd_device *obd = req->rq_import->imp_obd;
  82
  83                 null_encode_sec_part(req->rq_reqbuf,
  84                                      obd->u.cli.cl_sp_me);
  85         }
  86         req->rq_reqdata_len = req->rq_reqlen;
  87         return 0;
  88 }
  89
  90 static
  91 int null_ctx_verify(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
  92 {
  93         __u32 cksums, cksumc;
  94
  95         LASSERT(req->rq_repdata);
  96
  97         req->rq_repmsg = req->rq_repdata;
  98         req->rq_replen = req->rq_repdata_len;
  99
 100         if (req->rq_early) {
 101                 cksums = lustre_msg_get_cksum(req->rq_repdata);
 102                 cksumc = lustre_msg_calc_cksum(req->rq_repmsg);
 103                 if (cksumc != cksums) {
 104                         CDEBUG(D_SEC,
 105                                "early reply checksum mismatch: %08x != %08x\n",
 106                                cksumc, cksums);
 107                         return -EINVAL;
 108                 }
 109         }
 110
 111         return 0;
 112 }
 113
 114 static
 115 struct ptlrpc_sec *null_create_sec(struct obd_import *imp,
 116                                    struct ptlrpc_svc_ctx *svc_ctx,
 117                                    struct sptlrpc_flavor *sf)
 118 {
 119         LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_NULL);
 120
 121         /* general layer has take a module reference for us, because we never
 122          * really destroy the sec, simply release the reference here.
 123          */
 124         sptlrpc_policy_put(&null_policy);
 125         return &null_sec;
 126 }
 127
 128 static
 129 void null_destroy_sec(struct ptlrpc_sec *sec)
 130 {
 131         LASSERT(sec == &null_sec);
 132 }
 133
 134 static
 135 struct ptlrpc_cli_ctx *null_lookup_ctx(struct ptlrpc_sec *sec,
 136                                        struct vfs_cred *vcred,
 137                                        int create, int remove_dead)
 138 {
 139         atomic_inc(&null_cli_ctx.cc_refcount);
 140         return &null_cli_ctx;
 141 }
 142
 143 static
 144 int null_flush_ctx_cache(struct ptlrpc_sec *sec,
 145                          uid_t uid,
 146                          int grace, int force)
 147 {
 148         return 0;
 149 }
 150
 151 static
 152 int null_alloc_reqbuf(struct ptlrpc_sec *sec,
 153                       struct ptlrpc_request *req,
 154                       int msgsize)
 155 {
 156         if (!req->rq_reqbuf) {
 157                 int alloc_size = size_roundup_power2(msgsize);
 158
 159                 LASSERT(!req->rq_pool);
 160                 req->rq_reqbuf = libcfs_kvzalloc(alloc_size, GFP_NOFS);
 161                 if (!req->rq_reqbuf)
 162                         return -ENOMEM;
 163
 164                 req->rq_reqbuf_len = alloc_size;
 165         } else {
 166                 LASSERT(req->rq_pool);
 167                 LASSERT(req->rq_reqbuf_len >= msgsize);
 168                 memset(req->rq_reqbuf, 0, msgsize);
 169         }
 170
 171         req->rq_reqmsg = req->rq_reqbuf;
 172         return 0;
 173 }
 174
 175 static
 176 void null_free_reqbuf(struct ptlrpc_sec *sec,
 177                       struct ptlrpc_request *req)
 178 {
 179         if (!req->rq_pool) {
 180                 LASSERTF(req->rq_reqmsg == req->rq_reqbuf,
 181                          "req %p: reqmsg %p is not reqbuf %p in null sec\n",
 182                          req, req->rq_reqmsg, req->rq_reqbuf);
 183                 LASSERTF(req->rq_reqbuf_len >= req->rq_reqlen,
 184                          "req %p: reqlen %d should smaller than buflen %d\n",
 185                          req, req->rq_reqlen, req->rq_reqbuf_len);
 186
 187                 kvfree(req->rq_reqbuf);
 188                 req->rq_reqbuf = NULL;
 189                 req->rq_reqbuf_len = 0;
 190         }
 191 }
 192
 193 static
 194 int null_alloc_repbuf(struct ptlrpc_sec *sec,
 195                       struct ptlrpc_request *req,
 196                       int msgsize)
 197 {
 198         /* add space for early replied */
 199         msgsize += lustre_msg_early_size();
 200
 201         msgsize = size_roundup_power2(msgsize);
 202
 203         req->rq_repbuf = libcfs_kvzalloc(msgsize, GFP_NOFS);
 204         if (!req->rq_repbuf)
 205                 return -ENOMEM;
 206
 207         req->rq_repbuf_len = msgsize;
 208         return 0;
 209 }
 210
 211 static
 212 void null_free_repbuf(struct ptlrpc_sec *sec,
 213                       struct ptlrpc_request *req)
 214 {
 215         LASSERT(req->rq_repbuf);
 216
 217         kvfree(req->rq_repbuf);
 218         req->rq_repbuf = NULL;
 219         req->rq_repbuf_len = 0;
 220 }
 221
 222 static
 223 int null_enlarge_reqbuf(struct ptlrpc_sec *sec,
 224                         struct ptlrpc_request *req,
 225                         int segment, int newsize)
 226 {
 227         struct lustre_msg *newbuf;
 228         struct lustre_msg *oldbuf = req->rq_reqmsg;
 229         int oldsize, newmsg_size, alloc_size;
 230
 231         LASSERT(req->rq_reqbuf);
 232         LASSERT(req->rq_reqbuf == req->rq_reqmsg);
 233         LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
 234         LASSERT(req->rq_reqlen == lustre_packed_msg_size(oldbuf));
 235
 236         /* compute new message size */
 237         oldsize = req->rq_reqbuf->lm_buflens[segment];
 238         req->rq_reqbuf->lm_buflens[segment] = newsize;
 239         newmsg_size = lustre_packed_msg_size(oldbuf);
 240         req->rq_reqbuf->lm_buflens[segment] = oldsize;
 241
 242         /* request from pool should always have enough buffer */
 243         LASSERT(!req->rq_pool || req->rq_reqbuf_len >= newmsg_size);
 244
 245         if (req->rq_reqbuf_len < newmsg_size) {
 246                 alloc_size = size_roundup_power2(newmsg_size);
 247
 248                 newbuf = libcfs_kvzalloc(alloc_size, GFP_NOFS);
 249                 if (!newbuf)
 250                         return -ENOMEM;
 251
 252                 /* Must lock this, so that otherwise unprotected change of
 253                  * rq_reqmsg is not racing with parallel processing of
 254                  * imp_replay_list traversing threads. See LU-3333
 255                  * This is a bandaid at best, we really need to deal with this
 256                  * in request enlarging code before unpacking that's already
 257                  * there
 258                  */
 259                 if (req->rq_import)
 260                         spin_lock(&req->rq_import->imp_lock);
 261                 memcpy(newbuf, req->rq_reqbuf, req->rq_reqlen);
 262
 263                 kvfree(req->rq_reqbuf);
 264                 req->rq_reqbuf = newbuf;
 265                 req->rq_reqmsg = newbuf;
 266                 req->rq_reqbuf_len = alloc_size;
 267
 268                 if (req->rq_import)
 269                         spin_unlock(&req->rq_import->imp_lock);
 270         }
 271
 272         _sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
 273         req->rq_reqlen = newmsg_size;
 274
 275         return 0;
 276 }
 277
 278 static struct ptlrpc_svc_ctx null_svc_ctx = {
 279         .sc_refcount    = ATOMIC_INIT(1),
 280         .sc_policy      = &null_policy,
 281 };
 282
 283 static
 284 int null_accept(struct ptlrpc_request *req)
 285 {
 286         LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
 287                 SPTLRPC_POLICY_NULL);
 288
 289         if (req->rq_flvr.sf_rpc != SPTLRPC_FLVR_NULL) {
 290                 CERROR("Invalid rpc flavor 0x%x\n", req->rq_flvr.sf_rpc);
 291                 return SECSVC_DROP;
 292         }
 293
 294         req->rq_sp_from = null_decode_sec_part(req->rq_reqbuf);
 295
 296         req->rq_reqmsg = req->rq_reqbuf;
 297         req->rq_reqlen = req->rq_reqdata_len;
 298
 299         req->rq_svc_ctx = &null_svc_ctx;
 300         atomic_inc(&req->rq_svc_ctx->sc_refcount);
 301
 302         return SECSVC_OK;
 303 }
 304
 305 static
 306 int null_alloc_rs(struct ptlrpc_request *req, int msgsize)
 307 {
 308         struct ptlrpc_reply_state *rs;
 309         int rs_size = sizeof(*rs) + msgsize;
 310
 311         LASSERT(msgsize % 8 == 0);
 312
 313         rs = req->rq_reply_state;
 314
 315         if (rs) {
 316                 /* pre-allocated */
 317                 LASSERT(rs->rs_size >= rs_size);
 318         } else {
 319                 rs = libcfs_kvzalloc(rs_size, GFP_NOFS);
 320                 if (!rs)
 321                         return -ENOMEM;
 322
 323                 rs->rs_size = rs_size;
 324         }
 325
 326         rs->rs_svc_ctx = req->rq_svc_ctx;
 327         atomic_inc(&req->rq_svc_ctx->sc_refcount);
 328
 329         rs->rs_repbuf = (struct lustre_msg *)(rs + 1);
 330         rs->rs_repbuf_len = rs_size - sizeof(*rs);
 331         rs->rs_msg = rs->rs_repbuf;
 332
 333         req->rq_reply_state = rs;
 334         return 0;
 335 }
 336
 337 static
 338 void null_free_rs(struct ptlrpc_reply_state *rs)
 339 {
 340         LASSERT_ATOMIC_GT(&rs->rs_svc_ctx->sc_refcount, 1);
 341         atomic_dec(&rs->rs_svc_ctx->sc_refcount);
 342
 343         if (!rs->rs_prealloc)
 344                 kvfree(rs);
 345 }
 346
 347 static
 348 int null_authorize(struct ptlrpc_request *req)
 349 {
 350         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 351
 352         LASSERT(rs);
 353
 354         rs->rs_repbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
 355         rs->rs_repdata_len = req->rq_replen;
 356
 357         if (likely(req->rq_packed_final)) {
 358                 if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
 359                         req->rq_reply_off = lustre_msg_early_size();
 360                 else
 361                         req->rq_reply_off = 0;
 362         } else {
 363                 __u32 cksum;
 364
 365                 cksum = lustre_msg_calc_cksum(rs->rs_repbuf);
 366                 lustre_msg_set_cksum(rs->rs_repbuf, cksum);
 367                 req->rq_reply_off = 0;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static struct ptlrpc_ctx_ops null_ctx_ops = {
 374         .refresh                = null_ctx_refresh,
 375         .sign              = null_ctx_sign,
 376         .verify          = null_ctx_verify,
 377 };
 378
 379 static struct ptlrpc_sec_cops null_sec_cops = {
 380         .create_sec          = null_create_sec,
 381         .destroy_sec        = null_destroy_sec,
 382         .lookup_ctx          = null_lookup_ctx,
 383         .flush_ctx_cache        = null_flush_ctx_cache,
 384         .alloc_reqbuf      = null_alloc_reqbuf,
 385         .alloc_repbuf      = null_alloc_repbuf,
 386         .free_reqbuf        = null_free_reqbuf,
 387         .free_repbuf        = null_free_repbuf,
 388         .enlarge_reqbuf  = null_enlarge_reqbuf,
 389 };
 390
 391 static struct ptlrpc_sec_sops null_sec_sops = {
 392         .accept          = null_accept,
 393         .alloc_rs              = null_alloc_rs,
 394         .authorize            = null_authorize,
 395         .free_rs                = null_free_rs,
 396 };
 397
 398 static struct ptlrpc_sec_policy null_policy = {
 399         .sp_owner              = THIS_MODULE,
 400         .sp_name                = "sec.null",
 401         .sp_policy            = SPTLRPC_POLICY_NULL,
 402         .sp_cops                = &null_sec_cops,
 403         .sp_sops                = &null_sec_sops,
 404 };
 405
 406 static void null_init_internal(void)
 407 {
 408         static HLIST_HEAD(__list);
 409
 410         null_sec.ps_policy = &null_policy;
 411         atomic_set(&null_sec.ps_refcount, 1);     /* always busy */
 412         null_sec.ps_id = -1;
 413         null_sec.ps_import = NULL;
 414         null_sec.ps_flvr.sf_rpc = SPTLRPC_FLVR_NULL;
 415         null_sec.ps_flvr.sf_flags = 0;
 416         null_sec.ps_part = LUSTRE_SP_ANY;
 417         null_sec.ps_dying = 0;
 418         spin_lock_init(&null_sec.ps_lock);
 419         atomic_set(&null_sec.ps_nctx, 1);        /* for "null_cli_ctx" */
 420         INIT_LIST_HEAD(&null_sec.ps_gc_list);
 421         null_sec.ps_gc_interval = 0;
 422         null_sec.ps_gc_next = 0;
 423
 424         hlist_add_head(&null_cli_ctx.cc_cache, &__list);
 425         atomic_set(&null_cli_ctx.cc_refcount, 1);    /* for hash */
 426         null_cli_ctx.cc_sec = &null_sec;
 427         null_cli_ctx.cc_ops = &null_ctx_ops;
 428         null_cli_ctx.cc_expire = 0;
 429         null_cli_ctx.cc_flags = PTLRPC_CTX_CACHED | PTLRPC_CTX_ETERNAL |
 430                                 PTLRPC_CTX_UPTODATE;
 431         null_cli_ctx.cc_vcred.vc_uid = 0;
 432         spin_lock_init(&null_cli_ctx.cc_lock);
 433         INIT_LIST_HEAD(&null_cli_ctx.cc_req_list);
 434         INIT_LIST_HEAD(&null_cli_ctx.cc_gc_chain);
 435 }
 436
 437 int sptlrpc_null_init(void)
 438 {
 439         int rc;
 440
 441         null_init_internal();
 442
 443         rc = sptlrpc_register_policy(&null_policy);
 444         if (rc)
 445                 CERROR("failed to register %s: %d\n", null_policy.sp_name, rc);
 446
 447         return rc;
 448 }
 449
 450 void sptlrpc_null_fini(void)
 451 {
 452         int rc;
 453
 454         rc = sptlrpc_unregister_policy(&null_policy);
 455         if (rc)
 456                 CERROR("failed to unregister %s: %d\n",
 457                        null_policy.sp_name, rc);
 458 }