lustre/ptlrpc/sec_null.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  2008 Sun Microsystems, Inc. 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_null.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 static struct ptlrpc_sec_policy null_policy;
  57 static struct ptlrpc_sec        null_sec;
  58 static struct ptlrpc_cli_ctx    null_cli_ctx;
  59 static struct ptlrpc_svc_ctx    null_svc_ctx;
  60
  61 /*
  62  * we can temporarily use the topmost 8-bits of lm_secflvr to identify
  63  * the source sec part.
  64  */
  65 static inline
  66 void null_encode_sec_part(struct lustre_msg *msg, enum lustre_sec_part sp)
  67 {
  68         msg->lm_secflvr |= (((__u32) sp) & 0xFF) << 24;
  69 }
  70
  71 static inline
  72 enum lustre_sec_part null_decode_sec_part(struct lustre_msg *msg)
  73 {
  74         return (msg->lm_secflvr >> 24) & 0xFF;
  75 }
  76
  77 static int null_ctx_refresh(struct ptlrpc_cli_ctx *ctx)
  78 {
  79         /* should never reach here */
  80         LBUG();
  81         return 0;
  82 }
  83
  84 static
  85 int null_ctx_sign(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
  86 {
  87         req->rq_reqbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
  88
  89         if (!req->rq_import->imp_dlm_fake) {
  90                 struct obd_device *obd = req->rq_import->imp_obd;
  91                 null_encode_sec_part(req->rq_reqbuf,
  92                                      obd->u.cli.cl_sp_me);
  93         }
  94         req->rq_reqdata_len = req->rq_reqlen;
  95         return 0;
  96 }
  97
  98 static
  99 int null_ctx_verify(struct ptlrpc_cli_ctx *ctx, struct ptlrpc_request *req)
 100 {
 101         __u32   cksums, cksumc;
 102
 103         LASSERT(req->rq_repdata);
 104
 105         req->rq_repmsg = req->rq_repdata;
 106         req->rq_replen = req->rq_repdata_len;
 107
 108         if (req->rq_early) {
 109                 cksums = lustre_msg_get_cksum(req->rq_repdata);
 110                 cksumc = lustre_msg_calc_cksum(req->rq_repmsg);
 111                 if (cksumc != cksums) {
 112                         CWARN("early reply checksum mismatch: %08x != %08x\n",
 113                               cksumc, cksums);
 114                         return -EINVAL;
 115                 }
 116         }
 117
 118         return 0;
 119 }
 120
 121 static
 122 struct ptlrpc_sec *null_create_sec(struct obd_import *imp,
 123                                    struct ptlrpc_svc_ctx *svc_ctx,
 124                                    struct sptlrpc_flavor *sf)
 125 {
 126         LASSERT(SPTLRPC_FLVR_POLICY(sf->sf_rpc) == SPTLRPC_POLICY_NULL);
 127
 128         /* general layer has take a module reference for us, because we never
 129          * really destroy the sec, simply release the reference here.
 130          */
 131         sptlrpc_policy_put(&null_policy);
 132         return &null_sec;
 133 }
 134
 135 static
 136 void null_destroy_sec(struct ptlrpc_sec *sec)
 137 {
 138         LASSERT(sec == &null_sec);
 139 }
 140
 141 static
 142 struct ptlrpc_cli_ctx *null_lookup_ctx(struct ptlrpc_sec *sec,
 143                                        struct vfs_cred *vcred,
 144                                        int create, int remove_dead)
 145 {
 146         cfs_atomic_inc(&null_cli_ctx.cc_refcount);
 147         return &null_cli_ctx;
 148 }
 149
 150 static
 151 int null_flush_ctx_cache(struct ptlrpc_sec *sec,
 152                          uid_t uid,
 153                          int grace, int force)
 154 {
 155         return 0;
 156 }
 157
 158 static
 159 int null_alloc_reqbuf(struct ptlrpc_sec *sec,
 160                       struct ptlrpc_request *req,
 161                       int msgsize)
 162 {
 163         if (!req->rq_reqbuf) {
 164                 int alloc_size = size_roundup_power2(msgsize);
 165
 166                 LASSERT(!req->rq_pool);
 167                 OBD_ALLOC(req->rq_reqbuf, alloc_size);
 168                 if (!req->rq_reqbuf)
 169                         return -ENOMEM;
 170
 171                 req->rq_reqbuf_len = alloc_size;
 172         } else {
 173                 LASSERT(req->rq_pool);
 174                 LASSERT(req->rq_reqbuf_len >= msgsize);
 175                 memset(req->rq_reqbuf, 0, msgsize);
 176         }
 177
 178         req->rq_reqmsg = req->rq_reqbuf;
 179         return 0;
 180 }
 181
 182 static
 183 void null_free_reqbuf(struct ptlrpc_sec *sec,
 184                       struct ptlrpc_request *req)
 185 {
 186         if (!req->rq_pool) {
 187                 LASSERTF(req->rq_reqmsg == req->rq_reqbuf,
 188                          "req %p: reqmsg %p is not reqbuf %p in null sec\n",
 189                          req, req->rq_reqmsg, req->rq_reqbuf);
 190                 LASSERTF(req->rq_reqbuf_len >= req->rq_reqlen,
 191                          "req %p: reqlen %d should smaller than buflen %d\n",
 192                          req, req->rq_reqlen, req->rq_reqbuf_len);
 193
 194                 OBD_FREE(req->rq_reqbuf, req->rq_reqbuf_len);
 195                 req->rq_reqmsg = req->rq_reqbuf = NULL;
 196                 req->rq_reqbuf_len = 0;
 197         }
 198
 199         req->rq_reqmsg = NULL;
 200 }
 201
 202 static
 203 int null_alloc_repbuf(struct ptlrpc_sec *sec,
 204                       struct ptlrpc_request *req,
 205                       int msgsize)
 206 {
 207         /* add space for early replied */
 208         msgsize += lustre_msg_early_size();
 209
 210         msgsize = size_roundup_power2(msgsize);
 211
 212         OBD_ALLOC(req->rq_repbuf, msgsize);
 213         if (!req->rq_repbuf)
 214                 return -ENOMEM;
 215
 216         req->rq_repbuf_len = msgsize;
 217         return 0;
 218 }
 219
 220 static
 221 void null_free_repbuf(struct ptlrpc_sec *sec,
 222                       struct ptlrpc_request *req)
 223 {
 224         LASSERT(req->rq_repbuf);
 225
 226         OBD_FREE(req->rq_repbuf, req->rq_repbuf_len);
 227         req->rq_repbuf = NULL;
 228         req->rq_repbuf_len = 0;
 229
 230         req->rq_repmsg = NULL;
 231 }
 232
 233 static
 234 int null_enlarge_reqbuf(struct ptlrpc_sec *sec,
 235                         struct ptlrpc_request *req,
 236                         int segment, int newsize)
 237 {
 238         struct lustre_msg      *newbuf;
 239         struct lustre_msg      *oldbuf = req->rq_reqmsg;
 240         int                     oldsize, newmsg_size, alloc_size;
 241
 242         LASSERT(req->rq_reqbuf);
 243         LASSERT(req->rq_reqbuf == req->rq_reqmsg);
 244         LASSERT(req->rq_reqbuf_len >= req->rq_reqlen);
 245         LASSERT(req->rq_reqlen == lustre_packed_msg_size(oldbuf));
 246
 247         /* compute new message size */
 248         oldsize = req->rq_reqbuf->lm_buflens[segment];
 249         req->rq_reqbuf->lm_buflens[segment] = newsize;
 250         newmsg_size = lustre_packed_msg_size(oldbuf);
 251         req->rq_reqbuf->lm_buflens[segment] = oldsize;
 252
 253         /* request from pool should always have enough buffer */
 254         LASSERT(!req->rq_pool || req->rq_reqbuf_len >= newmsg_size);
 255
 256         if (req->rq_reqbuf_len < newmsg_size) {
 257                 alloc_size = size_roundup_power2(newmsg_size);
 258
 259                 OBD_ALLOC(newbuf, alloc_size);
 260                 if (newbuf == NULL)
 261                         return -ENOMEM;
 262
 263                 memcpy(newbuf, req->rq_reqbuf, req->rq_reqlen);
 264
 265                 OBD_FREE(req->rq_reqbuf, req->rq_reqbuf_len);
 266                 req->rq_reqbuf = req->rq_reqmsg = newbuf;
 267                 req->rq_reqbuf_len = alloc_size;
 268         }
 269
 270         _sptlrpc_enlarge_msg_inplace(req->rq_reqmsg, segment, newsize);
 271         req->rq_reqlen = newmsg_size;
 272
 273         return 0;
 274 }
 275
 276 static struct ptlrpc_svc_ctx null_svc_ctx = {
 277         .sc_refcount    = CFS_ATOMIC_INIT(1),
 278         .sc_policy      = &null_policy,
 279 };
 280
 281 static
 282 int null_accept(struct ptlrpc_request *req)
 283 {
 284         LASSERT(SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) ==
 285                 SPTLRPC_POLICY_NULL);
 286
 287         if (req->rq_flvr.sf_rpc != SPTLRPC_FLVR_NULL) {
 288                 CERROR("Invalid rpc flavor 0x%x\n", req->rq_flvr.sf_rpc);
 289                 return SECSVC_DROP;
 290         }
 291
 292         req->rq_sp_from = null_decode_sec_part(req->rq_reqbuf);
 293
 294         req->rq_reqmsg = req->rq_reqbuf;
 295         req->rq_reqlen = req->rq_reqdata_len;
 296
 297         req->rq_svc_ctx = &null_svc_ctx;
 298         cfs_atomic_inc(&req->rq_svc_ctx->sc_refcount);
 299
 300         return SECSVC_OK;
 301 }
 302
 303 static
 304 int null_alloc_rs(struct ptlrpc_request *req, int msgsize)
 305 {
 306         struct ptlrpc_reply_state *rs;
 307         int rs_size = sizeof(*rs) + msgsize;
 308
 309         LASSERT(msgsize % 8 == 0);
 310
 311         rs = req->rq_reply_state;
 312
 313         if (rs) {
 314                 /* pre-allocated */
 315                 LASSERT(rs->rs_size >= rs_size);
 316         } else {
 317                 OBD_ALLOC(rs, rs_size);
 318                 if (rs == NULL)
 319                         return -ENOMEM;
 320
 321                 rs->rs_size = rs_size;
 322         }
 323
 324         rs->rs_svc_ctx = req->rq_svc_ctx;
 325         cfs_atomic_inc(&req->rq_svc_ctx->sc_refcount);
 326
 327         rs->rs_repbuf = (struct lustre_msg *) (rs + 1);
 328         rs->rs_repbuf_len = rs_size - sizeof(*rs);
 329         rs->rs_msg = rs->rs_repbuf;
 330
 331         req->rq_reply_state = rs;
 332         return 0;
 333 }
 334
 335 static
 336 void null_free_rs(struct ptlrpc_reply_state *rs)
 337 {
 338         LASSERT(cfs_atomic_read(&rs->rs_svc_ctx->sc_refcount) > 1);
 339         cfs_atomic_dec(&rs->rs_svc_ctx->sc_refcount);
 340
 341         if (!rs->rs_prealloc)
 342                 OBD_FREE(rs, rs->rs_size);
 343 }
 344
 345 static
 346 int null_authorize(struct ptlrpc_request *req)
 347 {
 348         struct ptlrpc_reply_state *rs = req->rq_reply_state;
 349
 350         LASSERT(rs);
 351
 352         rs->rs_repbuf->lm_secflvr = SPTLRPC_FLVR_NULL;
 353         rs->rs_repdata_len = req->rq_replen;
 354
 355         if (likely(req->rq_packed_final)) {
 356                 if (lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)
 357                         req->rq_reply_off = lustre_msg_early_size();
 358                 else
 359                         req->rq_reply_off = 0;
 360         } else {
 361                 lustre_msg_set_cksum(rs->rs_repbuf,
 362                                      lustre_msg_calc_cksum(rs->rs_repbuf));
 363                 req->rq_reply_off = 0;
 364         }
 365
 366         return 0;
 367 }
 368
 369 static struct ptlrpc_ctx_ops null_ctx_ops = {
 370         .refresh                = null_ctx_refresh,
 371         .sign                   = null_ctx_sign,
 372         .verify                 = null_ctx_verify,
 373 };
 374
 375 static struct ptlrpc_sec_cops null_sec_cops = {
 376         .create_sec             = null_create_sec,
 377         .destroy_sec            = null_destroy_sec,
 378         .lookup_ctx             = null_lookup_ctx,
 379         .flush_ctx_cache        = null_flush_ctx_cache,
 380         .alloc_reqbuf           = null_alloc_reqbuf,
 381         .alloc_repbuf           = null_alloc_repbuf,
 382         .free_reqbuf            = null_free_reqbuf,
 383         .free_repbuf            = null_free_repbuf,
 384         .enlarge_reqbuf         = null_enlarge_reqbuf,
 385 };
 386
 387 static struct ptlrpc_sec_sops null_sec_sops = {
 388         .accept                 = null_accept,
 389         .alloc_rs               = null_alloc_rs,
 390         .authorize              = null_authorize,
 391         .free_rs                = null_free_rs,
 392 };
 393
 394 static struct ptlrpc_sec_policy null_policy = {
 395         .sp_owner               = THIS_MODULE,
 396         .sp_name                = "sec.null",
 397         .sp_policy              = SPTLRPC_POLICY_NULL,
 398         .sp_cops                = &null_sec_cops,
 399         .sp_sops                = &null_sec_sops,
 400 };
 401
 402 static void null_init_internal(void)
 403 {
 404         static CFS_HLIST_HEAD(__list);
 405
 406         null_sec.ps_policy = &null_policy;
 407         cfs_atomic_set(&null_sec.ps_refcount, 1);     /* always busy */
 408         null_sec.ps_id = -1;
 409         null_sec.ps_import = NULL;
 410         null_sec.ps_flvr.sf_rpc = SPTLRPC_FLVR_NULL;
 411         null_sec.ps_flvr.sf_flags = 0;
 412         null_sec.ps_part = LUSTRE_SP_ANY;
 413         null_sec.ps_dying = 0;
 414         cfs_spin_lock_init(&null_sec.ps_lock);
 415         cfs_atomic_set(&null_sec.ps_nctx, 1);         /* for "null_cli_ctx" */
 416         CFS_INIT_LIST_HEAD(&null_sec.ps_gc_list);
 417         null_sec.ps_gc_interval = 0;
 418         null_sec.ps_gc_next = 0;
 419
 420         cfs_hlist_add_head(&null_cli_ctx.cc_cache, &__list);
 421         cfs_atomic_set(&null_cli_ctx.cc_refcount, 1);    /* for hash */
 422         null_cli_ctx.cc_sec = &null_sec;
 423         null_cli_ctx.cc_ops = &null_ctx_ops;
 424         null_cli_ctx.cc_expire = 0;
 425         null_cli_ctx.cc_flags = PTLRPC_CTX_CACHED | PTLRPC_CTX_ETERNAL |
 426                                 PTLRPC_CTX_UPTODATE;
 427         null_cli_ctx.cc_vcred.vc_uid = 0;
 428         cfs_spin_lock_init(&null_cli_ctx.cc_lock);
 429         CFS_INIT_LIST_HEAD(&null_cli_ctx.cc_req_list);
 430         CFS_INIT_LIST_HEAD(&null_cli_ctx.cc_gc_chain);
 431 }
 432
 433 int sptlrpc_null_init(void)
 434 {
 435         int rc;
 436
 437         null_init_internal();
 438
 439         rc = sptlrpc_register_policy(&null_policy);
 440         if (rc)
 441                 CERROR("failed to register %s: %d\n", null_policy.sp_name, rc);
 442
 443         return rc;
 444 }
 445
 446 void sptlrpc_null_fini(void)
 447 {
 448         int rc;
 449
 450         rc = sptlrpc_unregister_policy(&null_policy);
 451         if (rc)
 452                 CERROR("failed to unregister %s: %d\n", null_policy.sp_name,rc);
 453 }